2 * Faraday FUSBH200 EHCI-like driver
4 * Copyright (c) 2013 Faraday Technology Corporation
6 * Author: Yuan-Hsin Chen <yhchen@faraday-tech.com>
7 * Feng-Hsin Chiang <john453@faraday-tech.com>
8 * Po-Yu Chuang <ratbert.chuang@gmail.com>
10 * Most of code borrowed from the Linux-3.7 EHCI driver
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version.
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
19 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software Foundation,
24 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include <linux/module.h>
28 #include <linux/device.h>
29 #include <linux/dmapool.h>
30 #include <linux/kernel.h>
31 #include <linux/delay.h>
32 #include <linux/ioport.h>
33 #include <linux/sched.h>
34 #include <linux/vmalloc.h>
35 #include <linux/errno.h>
36 #include <linux/init.h>
37 #include <linux/hrtimer.h>
38 #include <linux/list.h>
39 #include <linux/interrupt.h>
40 #include <linux/usb.h>
41 #include <linux/usb/hcd.h>
42 #include <linux/moduleparam.h>
43 #include <linux/dma-mapping.h>
44 #include <linux/debugfs.h>
45 #include <linux/slab.h>
46 #include <linux/uaccess.h>
47 #include <linux/platform_device.h>
49 #include <asm/byteorder.h>
52 #include <asm/unaligned.h>
54 /*-------------------------------------------------------------------------*/
55 #define DRIVER_AUTHOR "Yuan-Hsin Chen"
56 #define DRIVER_DESC "FUSBH200 Host Controller (EHCI) Driver"
58 static const char hcd_name
[] = "fusbh200_hcd";
60 #undef FUSBH200_URB_TRACE
62 /* magic numbers that can affect system performance */
63 #define FUSBH200_TUNE_CERR 3 /* 0-3 qtd retries; 0 == don't stop */
64 #define FUSBH200_TUNE_RL_HS 4 /* nak throttle; see 4.9 */
65 #define FUSBH200_TUNE_RL_TT 0
66 #define FUSBH200_TUNE_MULT_HS 1 /* 1-3 transactions/uframe; 4.10.3 */
67 #define FUSBH200_TUNE_MULT_TT 1
69 * Some drivers think it's safe to schedule isochronous transfers more than
70 * 256 ms into the future (partly as a result of an old bug in the scheduling
71 * code). In an attempt to avoid trouble, we will use a minimum scheduling
72 * length of 512 frames instead of 256.
74 #define FUSBH200_TUNE_FLS 1 /* (medium) 512-frame schedule */
76 /* Initial IRQ latency: faster than hw default */
77 static int log2_irq_thresh
= 0; // 0 to 6
78 module_param (log2_irq_thresh
, int, S_IRUGO
);
79 MODULE_PARM_DESC (log2_irq_thresh
, "log2 IRQ latency, 1-64 microframes");
81 /* initial park setting: slower than hw default */
82 static unsigned park
= 0;
83 module_param (park
, uint
, S_IRUGO
);
84 MODULE_PARM_DESC (park
, "park setting; 1-3 back-to-back async packets");
86 /* for link power management(LPM) feature */
87 static unsigned int hird
;
88 module_param(hird
, int, S_IRUGO
);
89 MODULE_PARM_DESC(hird
, "host initiated resume duration, +1 for each 75us");
91 #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
95 /*-------------------------------------------------------------------------*/
97 #define fusbh200_dbg(fusbh200, fmt, args...) \
98 dev_dbg (fusbh200_to_hcd(fusbh200)->self.controller , fmt , ## args )
99 #define fusbh200_err(fusbh200, fmt, args...) \
100 dev_err (fusbh200_to_hcd(fusbh200)->self.controller , fmt , ## args )
101 #define fusbh200_info(fusbh200, fmt, args...) \
102 dev_info (fusbh200_to_hcd(fusbh200)->self.controller , fmt , ## args )
103 #define fusbh200_warn(fusbh200, fmt, args...) \
104 dev_warn (fusbh200_to_hcd(fusbh200)->self.controller , fmt , ## args )
106 /* check the values in the HCSPARAMS register
107 * (host controller _Structural_ parameters)
108 * see EHCI spec, Table 2-4 for each value
110 static void dbg_hcs_params (struct fusbh200_hcd
*fusbh200
, char *label
)
112 u32 params
= fusbh200_readl(fusbh200
, &fusbh200
->caps
->hcs_params
);
114 fusbh200_dbg (fusbh200
,
115 "%s hcs_params 0x%x ports=%d\n",
121 /* check the values in the HCCPARAMS register
122 * (host controller _Capability_ parameters)
123 * see EHCI Spec, Table 2-5 for each value
125 static void dbg_hcc_params (struct fusbh200_hcd
*fusbh200
, char *label
)
127 u32 params
= fusbh200_readl(fusbh200
, &fusbh200
->caps
->hcc_params
);
129 fusbh200_dbg (fusbh200
,
130 "%s hcc_params %04x uframes %s%s\n",
133 HCC_PGM_FRAMELISTLEN(params
) ? "256/512/1024" : "1024",
134 HCC_CANPARK(params
) ? " park" : "");
137 static void __maybe_unused
138 dbg_qtd (const char *label
, struct fusbh200_hcd
*fusbh200
, struct fusbh200_qtd
*qtd
)
140 fusbh200_dbg(fusbh200
, "%s td %p n%08x %08x t%08x p0=%08x\n", label
, qtd
,
141 hc32_to_cpup(fusbh200
, &qtd
->hw_next
),
142 hc32_to_cpup(fusbh200
, &qtd
->hw_alt_next
),
143 hc32_to_cpup(fusbh200
, &qtd
->hw_token
),
144 hc32_to_cpup(fusbh200
, &qtd
->hw_buf
[0]));
146 fusbh200_dbg(fusbh200
, " p1=%08x p2=%08x p3=%08x p4=%08x\n",
147 hc32_to_cpup(fusbh200
, &qtd
->hw_buf
[1]),
148 hc32_to_cpup(fusbh200
, &qtd
->hw_buf
[2]),
149 hc32_to_cpup(fusbh200
, &qtd
->hw_buf
[3]),
150 hc32_to_cpup(fusbh200
, &qtd
->hw_buf
[4]));
153 static void __maybe_unused
154 dbg_qh (const char *label
, struct fusbh200_hcd
*fusbh200
, struct fusbh200_qh
*qh
)
156 struct fusbh200_qh_hw
*hw
= qh
->hw
;
158 fusbh200_dbg (fusbh200
, "%s qh %p n%08x info %x %x qtd %x\n", label
,
159 qh
, hw
->hw_next
, hw
->hw_info1
, hw
->hw_info2
, hw
->hw_current
);
160 dbg_qtd("overlay", fusbh200
, (struct fusbh200_qtd
*) &hw
->hw_qtd_next
);
163 static void __maybe_unused
164 dbg_itd (const char *label
, struct fusbh200_hcd
*fusbh200
, struct fusbh200_itd
*itd
)
166 fusbh200_dbg (fusbh200
, "%s [%d] itd %p, next %08x, urb %p\n",
167 label
, itd
->frame
, itd
, hc32_to_cpu(fusbh200
, itd
->hw_next
),
169 fusbh200_dbg (fusbh200
,
170 " trans: %08x %08x %08x %08x %08x %08x %08x %08x\n",
171 hc32_to_cpu(fusbh200
, itd
->hw_transaction
[0]),
172 hc32_to_cpu(fusbh200
, itd
->hw_transaction
[1]),
173 hc32_to_cpu(fusbh200
, itd
->hw_transaction
[2]),
174 hc32_to_cpu(fusbh200
, itd
->hw_transaction
[3]),
175 hc32_to_cpu(fusbh200
, itd
->hw_transaction
[4]),
176 hc32_to_cpu(fusbh200
, itd
->hw_transaction
[5]),
177 hc32_to_cpu(fusbh200
, itd
->hw_transaction
[6]),
178 hc32_to_cpu(fusbh200
, itd
->hw_transaction
[7]));
179 fusbh200_dbg (fusbh200
,
180 " buf: %08x %08x %08x %08x %08x %08x %08x\n",
181 hc32_to_cpu(fusbh200
, itd
->hw_bufp
[0]),
182 hc32_to_cpu(fusbh200
, itd
->hw_bufp
[1]),
183 hc32_to_cpu(fusbh200
, itd
->hw_bufp
[2]),
184 hc32_to_cpu(fusbh200
, itd
->hw_bufp
[3]),
185 hc32_to_cpu(fusbh200
, itd
->hw_bufp
[4]),
186 hc32_to_cpu(fusbh200
, itd
->hw_bufp
[5]),
187 hc32_to_cpu(fusbh200
, itd
->hw_bufp
[6]));
188 fusbh200_dbg (fusbh200
, " index: %d %d %d %d %d %d %d %d\n",
189 itd
->index
[0], itd
->index
[1], itd
->index
[2],
190 itd
->index
[3], itd
->index
[4], itd
->index
[5],
191 itd
->index
[6], itd
->index
[7]);
194 static int __maybe_unused
195 dbg_status_buf (char *buf
, unsigned len
, const char *label
, u32 status
)
197 return scnprintf (buf
, len
,
198 "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s",
199 label
, label
[0] ? " " : "", status
,
200 (status
& STS_ASS
) ? " Async" : "",
201 (status
& STS_PSS
) ? " Periodic" : "",
202 (status
& STS_RECL
) ? " Recl" : "",
203 (status
& STS_HALT
) ? " Halt" : "",
204 (status
& STS_IAA
) ? " IAA" : "",
205 (status
& STS_FATAL
) ? " FATAL" : "",
206 (status
& STS_FLR
) ? " FLR" : "",
207 (status
& STS_PCD
) ? " PCD" : "",
208 (status
& STS_ERR
) ? " ERR" : "",
209 (status
& STS_INT
) ? " INT" : ""
213 static int __maybe_unused
214 dbg_intr_buf (char *buf
, unsigned len
, const char *label
, u32 enable
)
216 return scnprintf (buf
, len
,
217 "%s%sintrenable %02x%s%s%s%s%s%s",
218 label
, label
[0] ? " " : "", enable
,
219 (enable
& STS_IAA
) ? " IAA" : "",
220 (enable
& STS_FATAL
) ? " FATAL" : "",
221 (enable
& STS_FLR
) ? " FLR" : "",
222 (enable
& STS_PCD
) ? " PCD" : "",
223 (enable
& STS_ERR
) ? " ERR" : "",
224 (enable
& STS_INT
) ? " INT" : ""
228 static const char *const fls_strings
[] =
229 { "1024", "512", "256", "??" };
232 dbg_command_buf (char *buf
, unsigned len
, const char *label
, u32 command
)
234 return scnprintf (buf
, len
,
235 "%s%scommand %07x %s=%d ithresh=%d%s%s%s "
237 label
, label
[0] ? " " : "", command
,
238 (command
& CMD_PARK
) ? " park" : "(park)",
239 CMD_PARK_CNT (command
),
240 (command
>> 16) & 0x3f,
241 (command
& CMD_IAAD
) ? " IAAD" : "",
242 (command
& CMD_ASE
) ? " Async" : "",
243 (command
& CMD_PSE
) ? " Periodic" : "",
244 fls_strings
[(command
>> 2) & 0x3],
245 (command
& CMD_RESET
) ? " Reset" : "",
246 (command
& CMD_RUN
) ? "RUN" : "HALT"
251 dbg_port_buf (char *buf
, unsigned len
, const char *label
, int port
, u32 status
)
255 /* signaling state */
256 switch (status
& (3 << 10)) {
257 case 0 << 10: sig
= "se0"; break;
258 case 1 << 10: sig
= "k"; break; /* low speed */
259 case 2 << 10: sig
= "j"; break;
260 default: sig
= "?"; break;
263 return scnprintf (buf
, len
,
264 "%s%sport:%d status %06x %d "
265 "sig=%s%s%s%s%s%s%s%s",
266 label
, label
[0] ? " " : "", port
, status
,
267 status
>>25,/*device address */
269 (status
& PORT_RESET
) ? " RESET" : "",
270 (status
& PORT_SUSPEND
) ? " SUSPEND" : "",
271 (status
& PORT_RESUME
) ? " RESUME" : "",
272 (status
& PORT_PEC
) ? " PEC" : "",
273 (status
& PORT_PE
) ? " PE" : "",
274 (status
& PORT_CSC
) ? " CSC" : "",
275 (status
& PORT_CONNECT
) ? " CONNECT" : "");
278 /* functions have the "wrong" filename when they're output... */
279 #define dbg_status(fusbh200, label, status) { \
281 dbg_status_buf (_buf, sizeof _buf, label, status); \
282 fusbh200_dbg (fusbh200, "%s\n", _buf); \
285 #define dbg_cmd(fusbh200, label, command) { \
287 dbg_command_buf (_buf, sizeof _buf, label, command); \
288 fusbh200_dbg (fusbh200, "%s\n", _buf); \
291 #define dbg_port(fusbh200, label, port, status) { \
293 dbg_port_buf (_buf, sizeof _buf, label, port, status); \
294 fusbh200_dbg (fusbh200, "%s\n", _buf); \
297 /*-------------------------------------------------------------------------*/
299 /* troubleshooting help: expose state in debugfs */
301 static int debug_async_open(struct inode
*, struct file
*);
302 static int debug_periodic_open(struct inode
*, struct file
*);
303 static int debug_registers_open(struct inode
*, struct file
*);
304 static int debug_async_open(struct inode
*, struct file
*);
306 static ssize_t
debug_output(struct file
*, char __user
*, size_t, loff_t
*);
307 static int debug_close(struct inode
*, struct file
*);
309 static const struct file_operations debug_async_fops
= {
310 .owner
= THIS_MODULE
,
311 .open
= debug_async_open
,
312 .read
= debug_output
,
313 .release
= debug_close
,
314 .llseek
= default_llseek
,
316 static const struct file_operations debug_periodic_fops
= {
317 .owner
= THIS_MODULE
,
318 .open
= debug_periodic_open
,
319 .read
= debug_output
,
320 .release
= debug_close
,
321 .llseek
= default_llseek
,
323 static const struct file_operations debug_registers_fops
= {
324 .owner
= THIS_MODULE
,
325 .open
= debug_registers_open
,
326 .read
= debug_output
,
327 .release
= debug_close
,
328 .llseek
= default_llseek
,
331 static struct dentry
*fusbh200_debug_root
;
333 struct debug_buffer
{
334 ssize_t (*fill_func
)(struct debug_buffer
*); /* fill method */
336 struct mutex mutex
; /* protect filling of buffer */
337 size_t count
; /* number of characters filled into buffer */
342 #define speed_char(info1) ({ char tmp; \
343 switch (info1 & (3 << 12)) { \
344 case QH_FULL_SPEED: tmp = 'f'; break; \
345 case QH_LOW_SPEED: tmp = 'l'; break; \
346 case QH_HIGH_SPEED: tmp = 'h'; break; \
347 default: tmp = '?'; break; \
350 static inline char token_mark(struct fusbh200_hcd
*fusbh200
, __hc32 token
)
352 __u32 v
= hc32_to_cpu(fusbh200
, token
);
354 if (v
& QTD_STS_ACTIVE
)
356 if (v
& QTD_STS_HALT
)
358 if (!IS_SHORT_READ (v
))
360 /* tries to advance through hw_alt_next */
364 static void qh_lines (
365 struct fusbh200_hcd
*fusbh200
,
366 struct fusbh200_qh
*qh
,
373 struct fusbh200_qtd
*td
;
375 unsigned size
= *sizep
;
378 __le32 list_end
= FUSBH200_LIST_END(fusbh200
);
379 struct fusbh200_qh_hw
*hw
= qh
->hw
;
381 if (hw
->hw_qtd_next
== list_end
) /* NEC does this */
384 mark
= token_mark(fusbh200
, hw
->hw_token
);
385 if (mark
== '/') { /* qh_alt_next controls qh advance? */
386 if ((hw
->hw_alt_next
& QTD_MASK(fusbh200
))
387 == fusbh200
->async
->hw
->hw_alt_next
)
388 mark
= '#'; /* blocked */
389 else if (hw
->hw_alt_next
== list_end
)
390 mark
= '.'; /* use hw_qtd_next */
391 /* else alt_next points to some other qtd */
393 scratch
= hc32_to_cpup(fusbh200
, &hw
->hw_info1
);
394 hw_curr
= (mark
== '*') ? hc32_to_cpup(fusbh200
, &hw
->hw_current
) : 0;
395 temp
= scnprintf (next
, size
,
396 "qh/%p dev%d %cs ep%d %08x %08x (%08x%c %s nak%d)",
397 qh
, scratch
& 0x007f,
398 speed_char (scratch
),
399 (scratch
>> 8) & 0x000f,
400 scratch
, hc32_to_cpup(fusbh200
, &hw
->hw_info2
),
401 hc32_to_cpup(fusbh200
, &hw
->hw_token
), mark
,
402 (cpu_to_hc32(fusbh200
, QTD_TOGGLE
) & hw
->hw_token
)
404 (hc32_to_cpup(fusbh200
, &hw
->hw_alt_next
) >> 1) & 0x0f);
408 /* hc may be modifying the list as we read it ... */
409 list_for_each_entry(td
, &qh
->qtd_list
, qtd_list
) {
410 scratch
= hc32_to_cpup(fusbh200
, &td
->hw_token
);
412 if (hw_curr
== td
->qtd_dma
)
414 else if (hw
->hw_qtd_next
== cpu_to_hc32(fusbh200
, td
->qtd_dma
))
416 else if (QTD_LENGTH (scratch
)) {
417 if (td
->hw_alt_next
== fusbh200
->async
->hw
->hw_alt_next
)
419 else if (td
->hw_alt_next
!= list_end
)
422 temp
= snprintf (next
, size
,
423 "\n\t%p%c%s len=%d %08x urb %p",
424 td
, mark
, ({ char *tmp
;
425 switch ((scratch
>>8)&0x03) {
426 case 0: tmp
= "out"; break;
427 case 1: tmp
= "in"; break;
428 case 2: tmp
= "setup"; break;
429 default: tmp
= "?"; break;
431 (scratch
>> 16) & 0x7fff,
442 temp
= snprintf (next
, size
, "\n");
453 static ssize_t
fill_async_buffer(struct debug_buffer
*buf
)
456 struct fusbh200_hcd
*fusbh200
;
460 struct fusbh200_qh
*qh
;
462 hcd
= bus_to_hcd(buf
->bus
);
463 fusbh200
= hcd_to_fusbh200 (hcd
);
464 next
= buf
->output_buf
;
465 size
= buf
->alloc_size
;
469 /* dumps a snapshot of the async schedule.
470 * usually empty except for long-term bulk reads, or head.
471 * one QH per line, and TDs we know about
473 spin_lock_irqsave (&fusbh200
->lock
, flags
);
474 for (qh
= fusbh200
->async
->qh_next
.qh
; size
> 0 && qh
; qh
= qh
->qh_next
.qh
)
475 qh_lines (fusbh200
, qh
, &next
, &size
);
476 if (fusbh200
->async_unlink
&& size
> 0) {
477 temp
= scnprintf(next
, size
, "\nunlink =\n");
481 for (qh
= fusbh200
->async_unlink
; size
> 0 && qh
;
482 qh
= qh
->unlink_next
)
483 qh_lines (fusbh200
, qh
, &next
, &size
);
485 spin_unlock_irqrestore (&fusbh200
->lock
, flags
);
487 return strlen(buf
->output_buf
);
490 #define DBG_SCHED_LIMIT 64
491 static ssize_t
fill_periodic_buffer(struct debug_buffer
*buf
)
494 struct fusbh200_hcd
*fusbh200
;
496 union fusbh200_shadow p
, *seen
;
497 unsigned temp
, size
, seen_count
;
502 if (!(seen
= kmalloc (DBG_SCHED_LIMIT
* sizeof *seen
, GFP_ATOMIC
)))
506 hcd
= bus_to_hcd(buf
->bus
);
507 fusbh200
= hcd_to_fusbh200 (hcd
);
508 next
= buf
->output_buf
;
509 size
= buf
->alloc_size
;
511 temp
= scnprintf (next
, size
, "size = %d\n", fusbh200
->periodic_size
);
515 /* dump a snapshot of the periodic schedule.
516 * iso changes, interrupt usually doesn't.
518 spin_lock_irqsave (&fusbh200
->lock
, flags
);
519 for (i
= 0; i
< fusbh200
->periodic_size
; i
++) {
520 p
= fusbh200
->pshadow
[i
];
523 tag
= Q_NEXT_TYPE(fusbh200
, fusbh200
->periodic
[i
]);
525 temp
= scnprintf (next
, size
, "%4d: ", i
);
530 struct fusbh200_qh_hw
*hw
;
532 switch (hc32_to_cpu(fusbh200
, tag
)) {
535 temp
= scnprintf (next
, size
, " qh%d-%04x/%p",
537 hc32_to_cpup(fusbh200
,
540 & (QH_CMASK
| QH_SMASK
),
544 /* don't repeat what follows this qh */
545 for (temp
= 0; temp
< seen_count
; temp
++) {
546 if (seen
[temp
].ptr
!= p
.ptr
)
548 if (p
.qh
->qh_next
.ptr
) {
549 temp
= scnprintf (next
, size
,
556 /* show more info the first time around */
557 if (temp
== seen_count
) {
558 u32 scratch
= hc32_to_cpup(fusbh200
,
560 struct fusbh200_qtd
*qtd
;
563 /* count tds, get ep direction */
565 list_for_each_entry (qtd
,
569 switch (0x03 & (hc32_to_cpu(
571 qtd
->hw_token
) >> 8)) {
572 case 0: type
= "out"; continue;
573 case 1: type
= "in"; continue;
577 temp
= scnprintf (next
, size
,
580 speed_char (scratch
),
582 (scratch
>> 8) & 0x000f, type
,
583 p
.qh
->usecs
, p
.qh
->c_usecs
,
585 0x7ff & (scratch
>> 16));
587 if (seen_count
< DBG_SCHED_LIMIT
)
588 seen
[seen_count
++].qh
= p
.qh
;
591 tag
= Q_NEXT_TYPE(fusbh200
, hw
->hw_next
);
595 temp
= scnprintf (next
, size
,
596 " fstn-%8x/%p", p
.fstn
->hw_prev
,
598 tag
= Q_NEXT_TYPE(fusbh200
, p
.fstn
->hw_next
);
599 p
= p
.fstn
->fstn_next
;
602 temp
= scnprintf (next
, size
,
604 tag
= Q_NEXT_TYPE(fusbh200
, p
.itd
->hw_next
);
612 temp
= scnprintf (next
, size
, "\n");
616 spin_unlock_irqrestore (&fusbh200
->lock
, flags
);
619 return buf
->alloc_size
- size
;
621 #undef DBG_SCHED_LIMIT
623 static const char *rh_state_string(struct fusbh200_hcd
*fusbh200
)
625 switch (fusbh200
->rh_state
) {
626 case FUSBH200_RH_HALTED
:
628 case FUSBH200_RH_SUSPENDED
:
630 case FUSBH200_RH_RUNNING
:
632 case FUSBH200_RH_STOPPING
:
638 static ssize_t
fill_registers_buffer(struct debug_buffer
*buf
)
641 struct fusbh200_hcd
*fusbh200
;
643 unsigned temp
, size
, i
;
644 char *next
, scratch
[80];
645 static char fmt
[] = "%*s\n";
646 static char label
[] = "";
648 hcd
= bus_to_hcd(buf
->bus
);
649 fusbh200
= hcd_to_fusbh200 (hcd
);
650 next
= buf
->output_buf
;
651 size
= buf
->alloc_size
;
653 spin_lock_irqsave (&fusbh200
->lock
, flags
);
655 if (!HCD_HW_ACCESSIBLE(hcd
)) {
656 size
= scnprintf (next
, size
,
657 "bus %s, device %s\n"
659 "SUSPENDED (no register access)\n",
660 hcd
->self
.controller
->bus
->name
,
661 dev_name(hcd
->self
.controller
),
666 /* Capability Registers */
667 i
= HC_VERSION(fusbh200
, fusbh200_readl(fusbh200
, &fusbh200
->caps
->hc_capbase
));
668 temp
= scnprintf (next
, size
,
669 "bus %s, device %s\n"
671 "EHCI %x.%02x, rh state %s\n",
672 hcd
->self
.controller
->bus
->name
,
673 dev_name(hcd
->self
.controller
),
675 i
>> 8, i
& 0x0ff, rh_state_string(fusbh200
));
679 // FIXME interpret both types of params
680 i
= fusbh200_readl(fusbh200
, &fusbh200
->caps
->hcs_params
);
681 temp
= scnprintf (next
, size
, "structural params 0x%08x\n", i
);
685 i
= fusbh200_readl(fusbh200
, &fusbh200
->caps
->hcc_params
);
686 temp
= scnprintf (next
, size
, "capability params 0x%08x\n", i
);
690 /* Operational Registers */
691 temp
= dbg_status_buf (scratch
, sizeof scratch
, label
,
692 fusbh200_readl(fusbh200
, &fusbh200
->regs
->status
));
693 temp
= scnprintf (next
, size
, fmt
, temp
, scratch
);
697 temp
= dbg_command_buf (scratch
, sizeof scratch
, label
,
698 fusbh200_readl(fusbh200
, &fusbh200
->regs
->command
));
699 temp
= scnprintf (next
, size
, fmt
, temp
, scratch
);
703 temp
= dbg_intr_buf (scratch
, sizeof scratch
, label
,
704 fusbh200_readl(fusbh200
, &fusbh200
->regs
->intr_enable
));
705 temp
= scnprintf (next
, size
, fmt
, temp
, scratch
);
709 temp
= scnprintf (next
, size
, "uframe %04x\n",
710 fusbh200_read_frame_index(fusbh200
));
714 if (fusbh200
->async_unlink
) {
715 temp
= scnprintf(next
, size
, "async unlink qh %p\n",
716 fusbh200
->async_unlink
);
721 temp
= scnprintf (next
, size
,
722 "irq normal %ld err %ld iaa %ld (lost %ld)\n",
723 fusbh200
->stats
.normal
, fusbh200
->stats
.error
, fusbh200
->stats
.iaa
,
724 fusbh200
->stats
.lost_iaa
);
728 temp
= scnprintf (next
, size
, "complete %ld unlink %ld\n",
729 fusbh200
->stats
.complete
, fusbh200
->stats
.unlink
);
734 spin_unlock_irqrestore (&fusbh200
->lock
, flags
);
736 return buf
->alloc_size
- size
;
739 static struct debug_buffer
*alloc_buffer(struct usb_bus
*bus
,
740 ssize_t (*fill_func
)(struct debug_buffer
*))
742 struct debug_buffer
*buf
;
744 buf
= kzalloc(sizeof(struct debug_buffer
), GFP_KERNEL
);
748 buf
->fill_func
= fill_func
;
749 mutex_init(&buf
->mutex
);
750 buf
->alloc_size
= PAGE_SIZE
;
756 static int fill_buffer(struct debug_buffer
*buf
)
760 if (!buf
->output_buf
)
761 buf
->output_buf
= vmalloc(buf
->alloc_size
);
763 if (!buf
->output_buf
) {
768 ret
= buf
->fill_func(buf
);
779 static ssize_t
debug_output(struct file
*file
, char __user
*user_buf
,
780 size_t len
, loff_t
*offset
)
782 struct debug_buffer
*buf
= file
->private_data
;
785 mutex_lock(&buf
->mutex
);
786 if (buf
->count
== 0) {
787 ret
= fill_buffer(buf
);
789 mutex_unlock(&buf
->mutex
);
793 mutex_unlock(&buf
->mutex
);
795 ret
= simple_read_from_buffer(user_buf
, len
, offset
,
796 buf
->output_buf
, buf
->count
);
803 static int debug_close(struct inode
*inode
, struct file
*file
)
805 struct debug_buffer
*buf
= file
->private_data
;
808 vfree(buf
->output_buf
);
814 static int debug_async_open(struct inode
*inode
, struct file
*file
)
816 file
->private_data
= alloc_buffer(inode
->i_private
, fill_async_buffer
);
818 return file
->private_data
? 0 : -ENOMEM
;
821 static int debug_periodic_open(struct inode
*inode
, struct file
*file
)
823 struct debug_buffer
*buf
;
824 buf
= alloc_buffer(inode
->i_private
, fill_periodic_buffer
);
828 buf
->alloc_size
= (sizeof(void *) == 4 ? 6 : 8)*PAGE_SIZE
;
829 file
->private_data
= buf
;
833 static int debug_registers_open(struct inode
*inode
, struct file
*file
)
835 file
->private_data
= alloc_buffer(inode
->i_private
,
836 fill_registers_buffer
);
838 return file
->private_data
? 0 : -ENOMEM
;
841 static inline void create_debug_files (struct fusbh200_hcd
*fusbh200
)
843 struct usb_bus
*bus
= &fusbh200_to_hcd(fusbh200
)->self
;
845 fusbh200
->debug_dir
= debugfs_create_dir(bus
->bus_name
, fusbh200_debug_root
);
846 if (!fusbh200
->debug_dir
)
849 if (!debugfs_create_file("async", S_IRUGO
, fusbh200
->debug_dir
, bus
,
853 if (!debugfs_create_file("periodic", S_IRUGO
, fusbh200
->debug_dir
, bus
,
854 &debug_periodic_fops
))
857 if (!debugfs_create_file("registers", S_IRUGO
, fusbh200
->debug_dir
, bus
,
858 &debug_registers_fops
))
864 debugfs_remove_recursive(fusbh200
->debug_dir
);
867 static inline void remove_debug_files (struct fusbh200_hcd
*fusbh200
)
869 debugfs_remove_recursive(fusbh200
->debug_dir
);
872 /*-------------------------------------------------------------------------*/
875 * handshake - spin reading hc until handshake completes or fails
876 * @ptr: address of hc register to be read
877 * @mask: bits to look at in result of read
878 * @done: value of those bits when handshake succeeds
879 * @usec: timeout in microseconds
881 * Returns negative errno, or zero on success
883 * Success happens when the "mask" bits have the specified value (hardware
884 * handshake done). There are two failure modes: "usec" have passed (major
885 * hardware flakeout), or the register reads as all-ones (hardware removed).
887 * That last failure should_only happen in cases like physical cardbus eject
888 * before driver shutdown. But it also seems to be caused by bugs in cardbus
889 * bridge shutdown: shutting down the bridge before the devices using it.
891 static int handshake (struct fusbh200_hcd
*fusbh200
, void __iomem
*ptr
,
892 u32 mask
, u32 done
, int usec
)
897 result
= fusbh200_readl(fusbh200
, ptr
);
898 if (result
== ~(u32
)0) /* card removed */
910 * Force HC to halt state from unknown (EHCI spec section 2.3).
911 * Must be called with interrupts enabled and the lock not held.
913 static int fusbh200_halt (struct fusbh200_hcd
*fusbh200
)
917 spin_lock_irq(&fusbh200
->lock
);
919 /* disable any irqs left enabled by previous code */
920 fusbh200_writel(fusbh200
, 0, &fusbh200
->regs
->intr_enable
);
923 * This routine gets called during probe before fusbh200->command
924 * has been initialized, so we can't rely on its value.
926 fusbh200
->command
&= ~CMD_RUN
;
927 temp
= fusbh200_readl(fusbh200
, &fusbh200
->regs
->command
);
928 temp
&= ~(CMD_RUN
| CMD_IAAD
);
929 fusbh200_writel(fusbh200
, temp
, &fusbh200
->regs
->command
);
931 spin_unlock_irq(&fusbh200
->lock
);
932 synchronize_irq(fusbh200_to_hcd(fusbh200
)->irq
);
934 return handshake(fusbh200
, &fusbh200
->regs
->status
,
935 STS_HALT
, STS_HALT
, 16 * 125);
939 * Reset a non-running (STS_HALT == 1) controller.
940 * Must be called with interrupts enabled and the lock not held.
942 static int fusbh200_reset (struct fusbh200_hcd
*fusbh200
)
945 u32 command
= fusbh200_readl(fusbh200
, &fusbh200
->regs
->command
);
947 /* If the EHCI debug controller is active, special care must be
948 * taken before and after a host controller reset */
949 if (fusbh200
->debug
&& !dbgp_reset_prep(fusbh200_to_hcd(fusbh200
)))
950 fusbh200
->debug
= NULL
;
952 command
|= CMD_RESET
;
953 dbg_cmd (fusbh200
, "reset", command
);
954 fusbh200_writel(fusbh200
, command
, &fusbh200
->regs
->command
);
955 fusbh200
->rh_state
= FUSBH200_RH_HALTED
;
956 fusbh200
->next_statechange
= jiffies
;
957 retval
= handshake (fusbh200
, &fusbh200
->regs
->command
,
958 CMD_RESET
, 0, 250 * 1000);
964 dbgp_external_startup(fusbh200_to_hcd(fusbh200
));
966 fusbh200
->port_c_suspend
= fusbh200
->suspended_ports
=
967 fusbh200
->resuming_ports
= 0;
972 * Idle the controller (turn off the schedules).
973 * Must be called with interrupts enabled and the lock not held.
975 static void fusbh200_quiesce (struct fusbh200_hcd
*fusbh200
)
979 if (fusbh200
->rh_state
!= FUSBH200_RH_RUNNING
)
982 /* wait for any schedule enables/disables to take effect */
983 temp
= (fusbh200
->command
<< 10) & (STS_ASS
| STS_PSS
);
984 handshake(fusbh200
, &fusbh200
->regs
->status
, STS_ASS
| STS_PSS
, temp
, 16 * 125);
986 /* then disable anything that's still active */
987 spin_lock_irq(&fusbh200
->lock
);
988 fusbh200
->command
&= ~(CMD_ASE
| CMD_PSE
);
989 fusbh200_writel(fusbh200
, fusbh200
->command
, &fusbh200
->regs
->command
);
990 spin_unlock_irq(&fusbh200
->lock
);
992 /* hardware can take 16 microframes to turn off ... */
993 handshake(fusbh200
, &fusbh200
->regs
->status
, STS_ASS
| STS_PSS
, 0, 16 * 125);
996 /*-------------------------------------------------------------------------*/
998 static void end_unlink_async(struct fusbh200_hcd
*fusbh200
);
999 static void unlink_empty_async(struct fusbh200_hcd
*fusbh200
);
1000 static void fusbh200_work(struct fusbh200_hcd
*fusbh200
);
1001 static void start_unlink_intr(struct fusbh200_hcd
*fusbh200
, struct fusbh200_qh
*qh
);
1002 static void end_unlink_intr(struct fusbh200_hcd
*fusbh200
, struct fusbh200_qh
*qh
);
1004 /*-------------------------------------------------------------------------*/
1006 /* Set a bit in the USBCMD register */
1007 static void fusbh200_set_command_bit(struct fusbh200_hcd
*fusbh200
, u32 bit
)
1009 fusbh200
->command
|= bit
;
1010 fusbh200_writel(fusbh200
, fusbh200
->command
, &fusbh200
->regs
->command
);
1012 /* unblock posted write */
1013 fusbh200_readl(fusbh200
, &fusbh200
->regs
->command
);
1016 /* Clear a bit in the USBCMD register */
1017 static void fusbh200_clear_command_bit(struct fusbh200_hcd
*fusbh200
, u32 bit
)
1019 fusbh200
->command
&= ~bit
;
1020 fusbh200_writel(fusbh200
, fusbh200
->command
, &fusbh200
->regs
->command
);
1022 /* unblock posted write */
1023 fusbh200_readl(fusbh200
, &fusbh200
->regs
->command
);
1026 /*-------------------------------------------------------------------------*/
1029 * EHCI timer support... Now using hrtimers.
1031 * Lots of different events are triggered from fusbh200->hrtimer. Whenever
1032 * the timer routine runs, it checks each possible event; events that are
1033 * currently enabled and whose expiration time has passed get handled.
1034 * The set of enabled events is stored as a collection of bitflags in
1035 * fusbh200->enabled_hrtimer_events, and they are numbered in order of
1036 * increasing delay values (ranging between 1 ms and 100 ms).
1038 * Rather than implementing a sorted list or tree of all pending events,
1039 * we keep track only of the lowest-numbered pending event, in
1040 * fusbh200->next_hrtimer_event. Whenever fusbh200->hrtimer gets restarted, its
1041 * expiration time is set to the timeout value for this event.
1043 * As a result, events might not get handled right away; the actual delay
1044 * could be anywhere up to twice the requested delay. This doesn't
1045 * matter, because none of the events are especially time-critical. The
1046 * ones that matter most all have a delay of 1 ms, so they will be
1047 * handled after 2 ms at most, which is okay. In addition to this, we
1048 * allow for an expiration range of 1 ms.
1052 * Delay lengths for the hrtimer event types.
1053 * Keep this list sorted by delay length, in the same order as
1054 * the event types indexed by enum fusbh200_hrtimer_event in fusbh200.h.
1056 static unsigned event_delays_ns
[] = {
1057 1 * NSEC_PER_MSEC
, /* FUSBH200_HRTIMER_POLL_ASS */
1058 1 * NSEC_PER_MSEC
, /* FUSBH200_HRTIMER_POLL_PSS */
1059 1 * NSEC_PER_MSEC
, /* FUSBH200_HRTIMER_POLL_DEAD */
1060 1125 * NSEC_PER_USEC
, /* FUSBH200_HRTIMER_UNLINK_INTR */
1061 2 * NSEC_PER_MSEC
, /* FUSBH200_HRTIMER_FREE_ITDS */
1062 6 * NSEC_PER_MSEC
, /* FUSBH200_HRTIMER_ASYNC_UNLINKS */
1063 10 * NSEC_PER_MSEC
, /* FUSBH200_HRTIMER_IAA_WATCHDOG */
1064 10 * NSEC_PER_MSEC
, /* FUSBH200_HRTIMER_DISABLE_PERIODIC */
1065 15 * NSEC_PER_MSEC
, /* FUSBH200_HRTIMER_DISABLE_ASYNC */
1066 100 * NSEC_PER_MSEC
, /* FUSBH200_HRTIMER_IO_WATCHDOG */
1069 /* Enable a pending hrtimer event */
1070 static void fusbh200_enable_event(struct fusbh200_hcd
*fusbh200
, unsigned event
,
1073 ktime_t
*timeout
= &fusbh200
->hr_timeouts
[event
];
1076 *timeout
= ktime_add(ktime_get(),
1077 ktime_set(0, event_delays_ns
[event
]));
1078 fusbh200
->enabled_hrtimer_events
|= (1 << event
);
1080 /* Track only the lowest-numbered pending event */
1081 if (event
< fusbh200
->next_hrtimer_event
) {
1082 fusbh200
->next_hrtimer_event
= event
;
1083 hrtimer_start_range_ns(&fusbh200
->hrtimer
, *timeout
,
1084 NSEC_PER_MSEC
, HRTIMER_MODE_ABS
);
1089 /* Poll the STS_ASS status bit; see when it agrees with CMD_ASE */
1090 static void fusbh200_poll_ASS(struct fusbh200_hcd
*fusbh200
)
1092 unsigned actual
, want
;
1094 /* Don't enable anything if the controller isn't running (e.g., died) */
1095 if (fusbh200
->rh_state
!= FUSBH200_RH_RUNNING
)
1098 want
= (fusbh200
->command
& CMD_ASE
) ? STS_ASS
: 0;
1099 actual
= fusbh200_readl(fusbh200
, &fusbh200
->regs
->status
) & STS_ASS
;
1101 if (want
!= actual
) {
1103 /* Poll again later, but give up after about 20 ms */
1104 if (fusbh200
->ASS_poll_count
++ < 20) {
1105 fusbh200_enable_event(fusbh200
, FUSBH200_HRTIMER_POLL_ASS
, true);
1108 fusbh200_dbg(fusbh200
, "Waited too long for the async schedule status (%x/%x), giving up\n",
1111 fusbh200
->ASS_poll_count
= 0;
1113 /* The status is up-to-date; restart or stop the schedule as needed */
1114 if (want
== 0) { /* Stopped */
1115 if (fusbh200
->async_count
> 0)
1116 fusbh200_set_command_bit(fusbh200
, CMD_ASE
);
1118 } else { /* Running */
1119 if (fusbh200
->async_count
== 0) {
1121 /* Turn off the schedule after a while */
1122 fusbh200_enable_event(fusbh200
, FUSBH200_HRTIMER_DISABLE_ASYNC
,
1128 /* Turn off the async schedule after a brief delay */
1129 static void fusbh200_disable_ASE(struct fusbh200_hcd
*fusbh200
)
1131 fusbh200_clear_command_bit(fusbh200
, CMD_ASE
);
1135 /* Poll the STS_PSS status bit; see when it agrees with CMD_PSE */
1136 static void fusbh200_poll_PSS(struct fusbh200_hcd
*fusbh200
)
1138 unsigned actual
, want
;
1140 /* Don't do anything if the controller isn't running (e.g., died) */
1141 if (fusbh200
->rh_state
!= FUSBH200_RH_RUNNING
)
1144 want
= (fusbh200
->command
& CMD_PSE
) ? STS_PSS
: 0;
1145 actual
= fusbh200_readl(fusbh200
, &fusbh200
->regs
->status
) & STS_PSS
;
1147 if (want
!= actual
) {
1149 /* Poll again later, but give up after about 20 ms */
1150 if (fusbh200
->PSS_poll_count
++ < 20) {
1151 fusbh200_enable_event(fusbh200
, FUSBH200_HRTIMER_POLL_PSS
, true);
1154 fusbh200_dbg(fusbh200
, "Waited too long for the periodic schedule status (%x/%x), giving up\n",
1157 fusbh200
->PSS_poll_count
= 0;
1159 /* The status is up-to-date; restart or stop the schedule as needed */
1160 if (want
== 0) { /* Stopped */
1161 if (fusbh200
->periodic_count
> 0)
1162 fusbh200_set_command_bit(fusbh200
, CMD_PSE
);
1164 } else { /* Running */
1165 if (fusbh200
->periodic_count
== 0) {
1167 /* Turn off the schedule after a while */
1168 fusbh200_enable_event(fusbh200
, FUSBH200_HRTIMER_DISABLE_PERIODIC
,
1174 /* Turn off the periodic schedule after a brief delay */
1175 static void fusbh200_disable_PSE(struct fusbh200_hcd
*fusbh200
)
1177 fusbh200_clear_command_bit(fusbh200
, CMD_PSE
);
1181 /* Poll the STS_HALT status bit; see when a dead controller stops */
1182 static void fusbh200_handle_controller_death(struct fusbh200_hcd
*fusbh200
)
1184 if (!(fusbh200_readl(fusbh200
, &fusbh200
->regs
->status
) & STS_HALT
)) {
1186 /* Give up after a few milliseconds */
1187 if (fusbh200
->died_poll_count
++ < 5) {
1188 /* Try again later */
1189 fusbh200_enable_event(fusbh200
, FUSBH200_HRTIMER_POLL_DEAD
, true);
1192 fusbh200_warn(fusbh200
, "Waited too long for the controller to stop, giving up\n");
1195 /* Clean up the mess */
1196 fusbh200
->rh_state
= FUSBH200_RH_HALTED
;
1197 fusbh200_writel(fusbh200
, 0, &fusbh200
->regs
->intr_enable
);
1198 fusbh200_work(fusbh200
);
1199 end_unlink_async(fusbh200
);
1201 /* Not in process context, so don't try to reset the controller */
1205 /* Handle unlinked interrupt QHs once they are gone from the hardware */
1206 static void fusbh200_handle_intr_unlinks(struct fusbh200_hcd
*fusbh200
)
1208 bool stopped
= (fusbh200
->rh_state
< FUSBH200_RH_RUNNING
);
1211 * Process all the QHs on the intr_unlink list that were added
1212 * before the current unlink cycle began. The list is in
1213 * temporal order, so stop when we reach the first entry in the
1214 * current cycle. But if the root hub isn't running then
1215 * process all the QHs on the list.
1217 fusbh200
->intr_unlinking
= true;
1218 while (fusbh200
->intr_unlink
) {
1219 struct fusbh200_qh
*qh
= fusbh200
->intr_unlink
;
1221 if (!stopped
&& qh
->unlink_cycle
== fusbh200
->intr_unlink_cycle
)
1223 fusbh200
->intr_unlink
= qh
->unlink_next
;
1224 qh
->unlink_next
= NULL
;
1225 end_unlink_intr(fusbh200
, qh
);
1228 /* Handle remaining entries later */
1229 if (fusbh200
->intr_unlink
) {
1230 fusbh200_enable_event(fusbh200
, FUSBH200_HRTIMER_UNLINK_INTR
, true);
1231 ++fusbh200
->intr_unlink_cycle
;
1233 fusbh200
->intr_unlinking
= false;
1237 /* Start another free-iTDs/siTDs cycle */
1238 static void start_free_itds(struct fusbh200_hcd
*fusbh200
)
1240 if (!(fusbh200
->enabled_hrtimer_events
& BIT(FUSBH200_HRTIMER_FREE_ITDS
))) {
1241 fusbh200
->last_itd_to_free
= list_entry(
1242 fusbh200
->cached_itd_list
.prev
,
1243 struct fusbh200_itd
, itd_list
);
1244 fusbh200_enable_event(fusbh200
, FUSBH200_HRTIMER_FREE_ITDS
, true);
1248 /* Wait for controller to stop using old iTDs and siTDs */
1249 static void end_free_itds(struct fusbh200_hcd
*fusbh200
)
1251 struct fusbh200_itd
*itd
, *n
;
1253 if (fusbh200
->rh_state
< FUSBH200_RH_RUNNING
) {
1254 fusbh200
->last_itd_to_free
= NULL
;
1257 list_for_each_entry_safe(itd
, n
, &fusbh200
->cached_itd_list
, itd_list
) {
1258 list_del(&itd
->itd_list
);
1259 dma_pool_free(fusbh200
->itd_pool
, itd
, itd
->itd_dma
);
1260 if (itd
== fusbh200
->last_itd_to_free
)
1264 if (!list_empty(&fusbh200
->cached_itd_list
))
1265 start_free_itds(fusbh200
);
1269 /* Handle lost (or very late) IAA interrupts */
1270 static void fusbh200_iaa_watchdog(struct fusbh200_hcd
*fusbh200
)
1272 if (fusbh200
->rh_state
!= FUSBH200_RH_RUNNING
)
1276 * Lost IAA irqs wedge things badly; seen first with a vt8235.
1277 * So we need this watchdog, but must protect it against both
1278 * (a) SMP races against real IAA firing and retriggering, and
1279 * (b) clean HC shutdown, when IAA watchdog was pending.
1281 if (fusbh200
->async_iaa
) {
1284 /* If we get here, IAA is *REALLY* late. It's barely
1285 * conceivable that the system is so busy that CMD_IAAD
1286 * is still legitimately set, so let's be sure it's
1287 * clear before we read STS_IAA. (The HC should clear
1288 * CMD_IAAD when it sets STS_IAA.)
1290 cmd
= fusbh200_readl(fusbh200
, &fusbh200
->regs
->command
);
1293 * If IAA is set here it either legitimately triggered
1294 * after the watchdog timer expired (_way_ late, so we'll
1295 * still count it as lost) ... or a silicon erratum:
1296 * - VIA seems to set IAA without triggering the IRQ;
1297 * - IAAD potentially cleared without setting IAA.
1299 status
= fusbh200_readl(fusbh200
, &fusbh200
->regs
->status
);
1300 if ((status
& STS_IAA
) || !(cmd
& CMD_IAAD
)) {
1301 COUNT(fusbh200
->stats
.lost_iaa
);
1302 fusbh200_writel(fusbh200
, STS_IAA
, &fusbh200
->regs
->status
);
1305 fusbh200_dbg(fusbh200
, "IAA watchdog: status %x cmd %x\n",
1307 end_unlink_async(fusbh200
);
1312 /* Enable the I/O watchdog, if appropriate */
1313 static void turn_on_io_watchdog(struct fusbh200_hcd
*fusbh200
)
1315 /* Not needed if the controller isn't running or it's already enabled */
1316 if (fusbh200
->rh_state
!= FUSBH200_RH_RUNNING
||
1317 (fusbh200
->enabled_hrtimer_events
&
1318 BIT(FUSBH200_HRTIMER_IO_WATCHDOG
)))
1322 * Isochronous transfers always need the watchdog.
1323 * For other sorts we use it only if the flag is set.
1325 if (fusbh200
->isoc_count
> 0 || (fusbh200
->need_io_watchdog
&&
1326 fusbh200
->async_count
+ fusbh200
->intr_count
> 0))
1327 fusbh200_enable_event(fusbh200
, FUSBH200_HRTIMER_IO_WATCHDOG
, true);
1332 * Handler functions for the hrtimer event types.
1333 * Keep this array in the same order as the event types indexed by
1334 * enum fusbh200_hrtimer_event in fusbh200.h.
1336 static void (*event_handlers
[])(struct fusbh200_hcd
*) = {
1337 fusbh200_poll_ASS
, /* FUSBH200_HRTIMER_POLL_ASS */
1338 fusbh200_poll_PSS
, /* FUSBH200_HRTIMER_POLL_PSS */
1339 fusbh200_handle_controller_death
, /* FUSBH200_HRTIMER_POLL_DEAD */
1340 fusbh200_handle_intr_unlinks
, /* FUSBH200_HRTIMER_UNLINK_INTR */
1341 end_free_itds
, /* FUSBH200_HRTIMER_FREE_ITDS */
1342 unlink_empty_async
, /* FUSBH200_HRTIMER_ASYNC_UNLINKS */
1343 fusbh200_iaa_watchdog
, /* FUSBH200_HRTIMER_IAA_WATCHDOG */
1344 fusbh200_disable_PSE
, /* FUSBH200_HRTIMER_DISABLE_PERIODIC */
1345 fusbh200_disable_ASE
, /* FUSBH200_HRTIMER_DISABLE_ASYNC */
1346 fusbh200_work
, /* FUSBH200_HRTIMER_IO_WATCHDOG */
1349 static enum hrtimer_restart
fusbh200_hrtimer_func(struct hrtimer
*t
)
1351 struct fusbh200_hcd
*fusbh200
= container_of(t
, struct fusbh200_hcd
, hrtimer
);
1353 unsigned long events
;
1354 unsigned long flags
;
1357 spin_lock_irqsave(&fusbh200
->lock
, flags
);
1359 events
= fusbh200
->enabled_hrtimer_events
;
1360 fusbh200
->enabled_hrtimer_events
= 0;
1361 fusbh200
->next_hrtimer_event
= FUSBH200_HRTIMER_NO_EVENT
;
1364 * Check each pending event. If its time has expired, handle
1365 * the event; otherwise re-enable it.
1368 for_each_set_bit(e
, &events
, FUSBH200_HRTIMER_NUM_EVENTS
) {
1369 if (now
.tv64
>= fusbh200
->hr_timeouts
[e
].tv64
)
1370 event_handlers
[e
](fusbh200
);
1372 fusbh200_enable_event(fusbh200
, e
, false);
1375 spin_unlock_irqrestore(&fusbh200
->lock
, flags
);
1376 return HRTIMER_NORESTART
;
1379 /*-------------------------------------------------------------------------*/
1381 #define fusbh200_bus_suspend NULL
1382 #define fusbh200_bus_resume NULL
1384 /*-------------------------------------------------------------------------*/
1386 static int check_reset_complete (
1387 struct fusbh200_hcd
*fusbh200
,
1389 u32 __iomem
*status_reg
,
1392 if (!(port_status
& PORT_CONNECT
))
1395 /* if reset finished and it's still not enabled -- handoff */
1396 if (!(port_status
& PORT_PE
)) {
1397 /* with integrated TT, there's nobody to hand it to! */
1398 fusbh200_dbg (fusbh200
,
1399 "Failed to enable port %d on root hub TT\n",
1403 fusbh200_dbg(fusbh200
, "port %d reset complete, port enabled\n",
1410 /*-------------------------------------------------------------------------*/
1413 /* build "status change" packet (one or two bytes) from HC registers */
1416 fusbh200_hub_status_data (struct usb_hcd
*hcd
, char *buf
)
1418 struct fusbh200_hcd
*fusbh200
= hcd_to_fusbh200 (hcd
);
1422 unsigned long flags
;
1424 /* init status to no-changes */
1427 /* Inform the core about resumes-in-progress by returning
1428 * a non-zero value even if there are no status changes.
1430 status
= fusbh200
->resuming_ports
;
1432 mask
= PORT_CSC
| PORT_PEC
;
1433 // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
1435 /* no hub change reports (bit 0) for now (power, ...) */
1437 /* port N changes (bit N)? */
1438 spin_lock_irqsave (&fusbh200
->lock
, flags
);
1440 temp
= fusbh200_readl(fusbh200
, &fusbh200
->regs
->port_status
);
1443 * Return status information even for ports with OWNER set.
1444 * Otherwise hub_wq wouldn't see the disconnect event when a
1445 * high-speed device is switched over to the companion
1446 * controller by the user.
1449 if ((temp
& mask
) != 0 || test_bit(0, &fusbh200
->port_c_suspend
)
1450 || (fusbh200
->reset_done
[0] && time_after_eq(
1451 jiffies
, fusbh200
->reset_done
[0]))) {
1455 /* FIXME autosuspend idle root hubs */
1456 spin_unlock_irqrestore (&fusbh200
->lock
, flags
);
1457 return status
? retval
: 0;
1460 /*-------------------------------------------------------------------------*/
1463 fusbh200_hub_descriptor (
1464 struct fusbh200_hcd
*fusbh200
,
1465 struct usb_hub_descriptor
*desc
1467 int ports
= HCS_N_PORTS (fusbh200
->hcs_params
);
1470 desc
->bDescriptorType
= USB_DT_HUB
;
1471 desc
->bPwrOn2PwrGood
= 10; /* fusbh200 1.0, 2.3.9 says 20ms max */
1472 desc
->bHubContrCurrent
= 0;
1474 desc
->bNbrPorts
= ports
;
1475 temp
= 1 + (ports
/ 8);
1476 desc
->bDescLength
= 7 + 2 * temp
;
1478 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
1479 memset(&desc
->u
.hs
.DeviceRemovable
[0], 0, temp
);
1480 memset(&desc
->u
.hs
.DeviceRemovable
[temp
], 0xff, temp
);
1482 temp
= HUB_CHAR_INDV_PORT_OCPM
; /* per-port overcurrent reporting */
1483 temp
|= HUB_CHAR_NO_LPSM
; /* no power switching */
1484 desc
->wHubCharacteristics
= cpu_to_le16(temp
);
1487 /*-------------------------------------------------------------------------*/
1489 static int fusbh200_hub_control (
1490 struct usb_hcd
*hcd
,
1497 struct fusbh200_hcd
*fusbh200
= hcd_to_fusbh200 (hcd
);
1498 int ports
= HCS_N_PORTS (fusbh200
->hcs_params
);
1499 u32 __iomem
*status_reg
= &fusbh200
->regs
->port_status
;
1500 u32 temp
, temp1
, status
;
1501 unsigned long flags
;
1506 * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
1507 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
1508 * (track current state ourselves) ... blink for diagnostics,
1509 * power, "this is the one", etc. EHCI spec supports this.
1512 spin_lock_irqsave (&fusbh200
->lock
, flags
);
1514 case ClearHubFeature
:
1516 case C_HUB_LOCAL_POWER
:
1517 case C_HUB_OVER_CURRENT
:
1518 /* no hub-wide feature/status flags */
1524 case ClearPortFeature
:
1525 if (!wIndex
|| wIndex
> ports
)
1528 temp
= fusbh200_readl(fusbh200
, status_reg
);
1529 temp
&= ~PORT_RWC_BITS
;
1532 * Even if OWNER is set, so the port is owned by the
1533 * companion controller, hub_wq needs to be able to clear
1534 * the port-change status bits (especially
1535 * USB_PORT_STAT_C_CONNECTION).
1539 case USB_PORT_FEAT_ENABLE
:
1540 fusbh200_writel(fusbh200
, temp
& ~PORT_PE
, status_reg
);
1542 case USB_PORT_FEAT_C_ENABLE
:
1543 fusbh200_writel(fusbh200
, temp
| PORT_PEC
, status_reg
);
1545 case USB_PORT_FEAT_SUSPEND
:
1546 if (temp
& PORT_RESET
)
1548 if (!(temp
& PORT_SUSPEND
))
1550 if ((temp
& PORT_PE
) == 0)
1553 fusbh200_writel(fusbh200
, temp
| PORT_RESUME
, status_reg
);
1554 fusbh200
->reset_done
[wIndex
] = jiffies
1555 + msecs_to_jiffies(USB_RESUME_TIMEOUT
);
1557 case USB_PORT_FEAT_C_SUSPEND
:
1558 clear_bit(wIndex
, &fusbh200
->port_c_suspend
);
1560 case USB_PORT_FEAT_C_CONNECTION
:
1561 fusbh200_writel(fusbh200
, temp
| PORT_CSC
, status_reg
);
1563 case USB_PORT_FEAT_C_OVER_CURRENT
:
1564 fusbh200_writel(fusbh200
, temp
| BMISR_OVC
, &fusbh200
->regs
->bmisr
);
1566 case USB_PORT_FEAT_C_RESET
:
1567 /* GetPortStatus clears reset */
1572 fusbh200_readl(fusbh200
, &fusbh200
->regs
->command
); /* unblock posted write */
1574 case GetHubDescriptor
:
1575 fusbh200_hub_descriptor (fusbh200
, (struct usb_hub_descriptor
*)
1579 /* no hub-wide feature/status flags */
1581 //cpu_to_le32s ((u32 *) buf);
1584 if (!wIndex
|| wIndex
> ports
)
1588 temp
= fusbh200_readl(fusbh200
, status_reg
);
1591 if (temp
& PORT_CSC
)
1592 status
|= USB_PORT_STAT_C_CONNECTION
<< 16;
1593 if (temp
& PORT_PEC
)
1594 status
|= USB_PORT_STAT_C_ENABLE
<< 16;
1596 temp1
= fusbh200_readl(fusbh200
, &fusbh200
->regs
->bmisr
);
1597 if (temp1
& BMISR_OVC
)
1598 status
|= USB_PORT_STAT_C_OVERCURRENT
<< 16;
1600 /* whoever resumes must GetPortStatus to complete it!! */
1601 if (temp
& PORT_RESUME
) {
1603 /* Remote Wakeup received? */
1604 if (!fusbh200
->reset_done
[wIndex
]) {
1605 /* resume signaling for 20 msec */
1606 fusbh200
->reset_done
[wIndex
] = jiffies
1607 + msecs_to_jiffies(20);
1608 /* check the port again */
1609 mod_timer(&fusbh200_to_hcd(fusbh200
)->rh_timer
,
1610 fusbh200
->reset_done
[wIndex
]);
1613 /* resume completed? */
1614 else if (time_after_eq(jiffies
,
1615 fusbh200
->reset_done
[wIndex
])) {
1616 clear_bit(wIndex
, &fusbh200
->suspended_ports
);
1617 set_bit(wIndex
, &fusbh200
->port_c_suspend
);
1618 fusbh200
->reset_done
[wIndex
] = 0;
1620 /* stop resume signaling */
1621 temp
= fusbh200_readl(fusbh200
, status_reg
);
1622 fusbh200_writel(fusbh200
,
1623 temp
& ~(PORT_RWC_BITS
| PORT_RESUME
),
1625 clear_bit(wIndex
, &fusbh200
->resuming_ports
);
1626 retval
= handshake(fusbh200
, status_reg
,
1627 PORT_RESUME
, 0, 2000 /* 2msec */);
1629 fusbh200_err(fusbh200
,
1630 "port %d resume error %d\n",
1631 wIndex
+ 1, retval
);
1634 temp
&= ~(PORT_SUSPEND
|PORT_RESUME
|(3<<10));
1638 /* whoever resets must GetPortStatus to complete it!! */
1639 if ((temp
& PORT_RESET
)
1640 && time_after_eq(jiffies
,
1641 fusbh200
->reset_done
[wIndex
])) {
1642 status
|= USB_PORT_STAT_C_RESET
<< 16;
1643 fusbh200
->reset_done
[wIndex
] = 0;
1644 clear_bit(wIndex
, &fusbh200
->resuming_ports
);
1646 /* force reset to complete */
1647 fusbh200_writel(fusbh200
, temp
& ~(PORT_RWC_BITS
| PORT_RESET
),
1649 /* REVISIT: some hardware needs 550+ usec to clear
1650 * this bit; seems too long to spin routinely...
1652 retval
= handshake(fusbh200
, status_reg
,
1653 PORT_RESET
, 0, 1000);
1655 fusbh200_err (fusbh200
, "port %d reset error %d\n",
1656 wIndex
+ 1, retval
);
1660 /* see what we found out */
1661 temp
= check_reset_complete (fusbh200
, wIndex
, status_reg
,
1662 fusbh200_readl(fusbh200
, status_reg
));
1665 if (!(temp
& (PORT_RESUME
|PORT_RESET
))) {
1666 fusbh200
->reset_done
[wIndex
] = 0;
1667 clear_bit(wIndex
, &fusbh200
->resuming_ports
);
1670 /* transfer dedicated ports to the companion hc */
1671 if ((temp
& PORT_CONNECT
) &&
1672 test_bit(wIndex
, &fusbh200
->companion_ports
)) {
1673 temp
&= ~PORT_RWC_BITS
;
1674 fusbh200_writel(fusbh200
, temp
, status_reg
);
1675 fusbh200_dbg(fusbh200
, "port %d --> companion\n", wIndex
+ 1);
1676 temp
= fusbh200_readl(fusbh200
, status_reg
);
1680 * Even if OWNER is set, there's no harm letting hub_wq
1681 * see the wPortStatus values (they should all be 0 except
1682 * for PORT_POWER anyway).
1685 if (temp
& PORT_CONNECT
) {
1686 status
|= USB_PORT_STAT_CONNECTION
;
1687 status
|= fusbh200_port_speed(fusbh200
, temp
);
1690 status
|= USB_PORT_STAT_ENABLE
;
1692 /* maybe the port was unsuspended without our knowledge */
1693 if (temp
& (PORT_SUSPEND
|PORT_RESUME
)) {
1694 status
|= USB_PORT_STAT_SUSPEND
;
1695 } else if (test_bit(wIndex
, &fusbh200
->suspended_ports
)) {
1696 clear_bit(wIndex
, &fusbh200
->suspended_ports
);
1697 clear_bit(wIndex
, &fusbh200
->resuming_ports
);
1698 fusbh200
->reset_done
[wIndex
] = 0;
1700 set_bit(wIndex
, &fusbh200
->port_c_suspend
);
1703 temp1
= fusbh200_readl(fusbh200
, &fusbh200
->regs
->bmisr
);
1704 if (temp1
& BMISR_OVC
)
1705 status
|= USB_PORT_STAT_OVERCURRENT
;
1706 if (temp
& PORT_RESET
)
1707 status
|= USB_PORT_STAT_RESET
;
1708 if (test_bit(wIndex
, &fusbh200
->port_c_suspend
))
1709 status
|= USB_PORT_STAT_C_SUSPEND
<< 16;
1711 if (status
& ~0xffff) /* only if wPortChange is interesting */
1712 dbg_port(fusbh200
, "GetStatus", wIndex
+ 1, temp
);
1713 put_unaligned_le32(status
, buf
);
1717 case C_HUB_LOCAL_POWER
:
1718 case C_HUB_OVER_CURRENT
:
1719 /* no hub-wide feature/status flags */
1725 case SetPortFeature
:
1726 selector
= wIndex
>> 8;
1729 if (!wIndex
|| wIndex
> ports
)
1732 temp
= fusbh200_readl(fusbh200
, status_reg
);
1733 temp
&= ~PORT_RWC_BITS
;
1735 case USB_PORT_FEAT_SUSPEND
:
1736 if ((temp
& PORT_PE
) == 0
1737 || (temp
& PORT_RESET
) != 0)
1740 /* After above check the port must be connected.
1741 * Set appropriate bit thus could put phy into low power
1742 * mode if we have hostpc feature
1744 fusbh200_writel(fusbh200
, temp
| PORT_SUSPEND
, status_reg
);
1745 set_bit(wIndex
, &fusbh200
->suspended_ports
);
1747 case USB_PORT_FEAT_RESET
:
1748 if (temp
& PORT_RESUME
)
1750 /* line status bits may report this as low speed,
1751 * which can be fine if this root hub has a
1752 * transaction translator built in.
1754 fusbh200_dbg(fusbh200
, "port %d reset\n", wIndex
+ 1);
1759 * caller must wait, then call GetPortStatus
1760 * usb 2.0 spec says 50 ms resets on root
1762 fusbh200
->reset_done
[wIndex
] = jiffies
1763 + msecs_to_jiffies (50);
1764 fusbh200_writel(fusbh200
, temp
, status_reg
);
1767 /* For downstream facing ports (these): one hub port is put
1768 * into test mode according to USB2 11.24.2.13, then the hub
1769 * must be reset (which for root hub now means rmmod+modprobe,
1770 * or else system reboot). See EHCI 2.3.9 and 4.14 for info
1771 * about the EHCI-specific stuff.
1773 case USB_PORT_FEAT_TEST
:
1774 if (!selector
|| selector
> 5)
1776 spin_unlock_irqrestore(&fusbh200
->lock
, flags
);
1777 fusbh200_quiesce(fusbh200
);
1778 spin_lock_irqsave(&fusbh200
->lock
, flags
);
1780 /* Put all enabled ports into suspend */
1781 temp
= fusbh200_readl(fusbh200
, status_reg
) & ~PORT_RWC_BITS
;
1783 fusbh200_writel(fusbh200
, temp
| PORT_SUSPEND
,
1786 spin_unlock_irqrestore(&fusbh200
->lock
, flags
);
1787 fusbh200_halt(fusbh200
);
1788 spin_lock_irqsave(&fusbh200
->lock
, flags
);
1790 temp
= fusbh200_readl(fusbh200
, status_reg
);
1791 temp
|= selector
<< 16;
1792 fusbh200_writel(fusbh200
, temp
, status_reg
);
1798 fusbh200_readl(fusbh200
, &fusbh200
->regs
->command
); /* unblock posted writes */
1803 /* "stall" on error */
1806 spin_unlock_irqrestore (&fusbh200
->lock
, flags
);
1810 static void __maybe_unused
fusbh200_relinquish_port(struct usb_hcd
*hcd
,
1816 static int __maybe_unused
fusbh200_port_handed_over(struct usb_hcd
*hcd
,
1821 /*-------------------------------------------------------------------------*/
1823 * There's basically three types of memory:
1824 * - data used only by the HCD ... kmalloc is fine
1825 * - async and periodic schedules, shared by HC and HCD ... these
1826 * need to use dma_pool or dma_alloc_coherent
1827 * - driver buffers, read/written by HC ... single shot DMA mapped
1829 * There's also "register" data (e.g. PCI or SOC), which is memory mapped.
1830 * No memory seen by this driver is pageable.
1833 /*-------------------------------------------------------------------------*/
1835 /* Allocate the key transfer structures from the previously allocated pool */
1837 static inline void fusbh200_qtd_init(struct fusbh200_hcd
*fusbh200
, struct fusbh200_qtd
*qtd
,
1840 memset (qtd
, 0, sizeof *qtd
);
1842 qtd
->hw_token
= cpu_to_hc32(fusbh200
, QTD_STS_HALT
);
1843 qtd
->hw_next
= FUSBH200_LIST_END(fusbh200
);
1844 qtd
->hw_alt_next
= FUSBH200_LIST_END(fusbh200
);
1845 INIT_LIST_HEAD (&qtd
->qtd_list
);
1848 static struct fusbh200_qtd
*fusbh200_qtd_alloc (struct fusbh200_hcd
*fusbh200
, gfp_t flags
)
1850 struct fusbh200_qtd
*qtd
;
1853 qtd
= dma_pool_alloc (fusbh200
->qtd_pool
, flags
, &dma
);
1855 fusbh200_qtd_init(fusbh200
, qtd
, dma
);
1860 static inline void fusbh200_qtd_free (struct fusbh200_hcd
*fusbh200
, struct fusbh200_qtd
*qtd
)
1862 dma_pool_free (fusbh200
->qtd_pool
, qtd
, qtd
->qtd_dma
);
1866 static void qh_destroy(struct fusbh200_hcd
*fusbh200
, struct fusbh200_qh
*qh
)
1868 /* clean qtds first, and know this is not linked */
1869 if (!list_empty (&qh
->qtd_list
) || qh
->qh_next
.ptr
) {
1870 fusbh200_dbg (fusbh200
, "unused qh not empty!\n");
1874 fusbh200_qtd_free (fusbh200
, qh
->dummy
);
1875 dma_pool_free(fusbh200
->qh_pool
, qh
->hw
, qh
->qh_dma
);
1879 static struct fusbh200_qh
*fusbh200_qh_alloc (struct fusbh200_hcd
*fusbh200
, gfp_t flags
)
1881 struct fusbh200_qh
*qh
;
1884 qh
= kzalloc(sizeof *qh
, GFP_ATOMIC
);
1887 qh
->hw
= (struct fusbh200_qh_hw
*)
1888 dma_pool_alloc(fusbh200
->qh_pool
, flags
, &dma
);
1891 memset(qh
->hw
, 0, sizeof *qh
->hw
);
1893 // INIT_LIST_HEAD (&qh->qh_list);
1894 INIT_LIST_HEAD (&qh
->qtd_list
);
1896 /* dummy td enables safe urb queuing */
1897 qh
->dummy
= fusbh200_qtd_alloc (fusbh200
, flags
);
1898 if (qh
->dummy
== NULL
) {
1899 fusbh200_dbg (fusbh200
, "no dummy td\n");
1905 dma_pool_free(fusbh200
->qh_pool
, qh
->hw
, qh
->qh_dma
);
1911 /*-------------------------------------------------------------------------*/
1913 /* The queue heads and transfer descriptors are managed from pools tied
1914 * to each of the "per device" structures.
1915 * This is the initialisation and cleanup code.
1918 static void fusbh200_mem_cleanup (struct fusbh200_hcd
*fusbh200
)
1920 if (fusbh200
->async
)
1921 qh_destroy(fusbh200
, fusbh200
->async
);
1922 fusbh200
->async
= NULL
;
1924 if (fusbh200
->dummy
)
1925 qh_destroy(fusbh200
, fusbh200
->dummy
);
1926 fusbh200
->dummy
= NULL
;
1928 /* DMA consistent memory and pools */
1929 if (fusbh200
->qtd_pool
)
1930 dma_pool_destroy (fusbh200
->qtd_pool
);
1931 fusbh200
->qtd_pool
= NULL
;
1933 if (fusbh200
->qh_pool
) {
1934 dma_pool_destroy (fusbh200
->qh_pool
);
1935 fusbh200
->qh_pool
= NULL
;
1938 if (fusbh200
->itd_pool
)
1939 dma_pool_destroy (fusbh200
->itd_pool
);
1940 fusbh200
->itd_pool
= NULL
;
1942 if (fusbh200
->periodic
)
1943 dma_free_coherent (fusbh200_to_hcd(fusbh200
)->self
.controller
,
1944 fusbh200
->periodic_size
* sizeof (u32
),
1945 fusbh200
->periodic
, fusbh200
->periodic_dma
);
1946 fusbh200
->periodic
= NULL
;
1948 /* shadow periodic table */
1949 kfree(fusbh200
->pshadow
);
1950 fusbh200
->pshadow
= NULL
;
1953 /* remember to add cleanup code (above) if you add anything here */
1954 static int fusbh200_mem_init (struct fusbh200_hcd
*fusbh200
, gfp_t flags
)
1958 /* QTDs for control/bulk/intr transfers */
1959 fusbh200
->qtd_pool
= dma_pool_create ("fusbh200_qtd",
1960 fusbh200_to_hcd(fusbh200
)->self
.controller
,
1961 sizeof (struct fusbh200_qtd
),
1962 32 /* byte alignment (for hw parts) */,
1963 4096 /* can't cross 4K */);
1964 if (!fusbh200
->qtd_pool
) {
1968 /* QHs for control/bulk/intr transfers */
1969 fusbh200
->qh_pool
= dma_pool_create ("fusbh200_qh",
1970 fusbh200_to_hcd(fusbh200
)->self
.controller
,
1971 sizeof(struct fusbh200_qh_hw
),
1972 32 /* byte alignment (for hw parts) */,
1973 4096 /* can't cross 4K */);
1974 if (!fusbh200
->qh_pool
) {
1977 fusbh200
->async
= fusbh200_qh_alloc (fusbh200
, flags
);
1978 if (!fusbh200
->async
) {
1982 /* ITD for high speed ISO transfers */
1983 fusbh200
->itd_pool
= dma_pool_create ("fusbh200_itd",
1984 fusbh200_to_hcd(fusbh200
)->self
.controller
,
1985 sizeof (struct fusbh200_itd
),
1986 64 /* byte alignment (for hw parts) */,
1987 4096 /* can't cross 4K */);
1988 if (!fusbh200
->itd_pool
) {
1992 /* Hardware periodic table */
1993 fusbh200
->periodic
= (__le32
*)
1994 dma_alloc_coherent (fusbh200_to_hcd(fusbh200
)->self
.controller
,
1995 fusbh200
->periodic_size
* sizeof(__le32
),
1996 &fusbh200
->periodic_dma
, 0);
1997 if (fusbh200
->periodic
== NULL
) {
2001 for (i
= 0; i
< fusbh200
->periodic_size
; i
++)
2002 fusbh200
->periodic
[i
] = FUSBH200_LIST_END(fusbh200
);
2004 /* software shadow of hardware table */
2005 fusbh200
->pshadow
= kcalloc(fusbh200
->periodic_size
, sizeof(void *), flags
);
2006 if (fusbh200
->pshadow
!= NULL
)
2010 fusbh200_dbg (fusbh200
, "couldn't init memory\n");
2011 fusbh200_mem_cleanup (fusbh200
);
2014 /*-------------------------------------------------------------------------*/
2016 * EHCI hardware queue manipulation ... the core. QH/QTD manipulation.
2018 * Control, bulk, and interrupt traffic all use "qh" lists. They list "qtd"
2019 * entries describing USB transactions, max 16-20kB/entry (with 4kB-aligned
2020 * buffers needed for the larger number). We use one QH per endpoint, queue
2021 * multiple urbs (all three types) per endpoint. URBs may need several qtds.
2023 * ISO traffic uses "ISO TD" (itd) records, and (along with
2024 * interrupts) needs careful scheduling. Performance improvements can be
2025 * an ongoing challenge. That's in "ehci-sched.c".
2027 * USB 1.1 devices are handled (a) by "companion" OHCI or UHCI root hubs,
2028 * or otherwise through transaction translators (TTs) in USB 2.0 hubs using
2029 * (b) special fields in qh entries or (c) split iso entries. TTs will
2030 * buffer low/full speed data so the host collects it at high speed.
2033 /*-------------------------------------------------------------------------*/
2035 /* fill a qtd, returning how much of the buffer we were able to queue up */
2038 qtd_fill(struct fusbh200_hcd
*fusbh200
, struct fusbh200_qtd
*qtd
, dma_addr_t buf
,
2039 size_t len
, int token
, int maxpacket
)
2044 /* one buffer entry per 4K ... first might be short or unaligned */
2045 qtd
->hw_buf
[0] = cpu_to_hc32(fusbh200
, (u32
)addr
);
2046 qtd
->hw_buf_hi
[0] = cpu_to_hc32(fusbh200
, (u32
)(addr
>> 32));
2047 count
= 0x1000 - (buf
& 0x0fff); /* rest of that page */
2048 if (likely (len
< count
)) /* ... iff needed */
2054 /* per-qtd limit: from 16K to 20K (best alignment) */
2055 for (i
= 1; count
< len
&& i
< 5; i
++) {
2057 qtd
->hw_buf
[i
] = cpu_to_hc32(fusbh200
, (u32
)addr
);
2058 qtd
->hw_buf_hi
[i
] = cpu_to_hc32(fusbh200
,
2061 if ((count
+ 0x1000) < len
)
2067 /* short packets may only terminate transfers */
2069 count
-= (count
% maxpacket
);
2071 qtd
->hw_token
= cpu_to_hc32(fusbh200
, (count
<< 16) | token
);
2072 qtd
->length
= count
;
2077 /*-------------------------------------------------------------------------*/
2080 qh_update (struct fusbh200_hcd
*fusbh200
, struct fusbh200_qh
*qh
, struct fusbh200_qtd
*qtd
)
2082 struct fusbh200_qh_hw
*hw
= qh
->hw
;
2084 /* writes to an active overlay are unsafe */
2085 BUG_ON(qh
->qh_state
!= QH_STATE_IDLE
);
2087 hw
->hw_qtd_next
= QTD_NEXT(fusbh200
, qtd
->qtd_dma
);
2088 hw
->hw_alt_next
= FUSBH200_LIST_END(fusbh200
);
2090 /* Except for control endpoints, we make hardware maintain data
2091 * toggle (like OHCI) ... here (re)initialize the toggle in the QH,
2092 * and set the pseudo-toggle in udev. Only usb_clear_halt() will
2095 if (!(hw
->hw_info1
& cpu_to_hc32(fusbh200
, QH_TOGGLE_CTL
))) {
2096 unsigned is_out
, epnum
;
2098 is_out
= qh
->is_out
;
2099 epnum
= (hc32_to_cpup(fusbh200
, &hw
->hw_info1
) >> 8) & 0x0f;
2100 if (unlikely (!usb_gettoggle (qh
->dev
, epnum
, is_out
))) {
2101 hw
->hw_token
&= ~cpu_to_hc32(fusbh200
, QTD_TOGGLE
);
2102 usb_settoggle (qh
->dev
, epnum
, is_out
, 1);
2106 hw
->hw_token
&= cpu_to_hc32(fusbh200
, QTD_TOGGLE
| QTD_STS_PING
);
2109 /* if it weren't for a common silicon quirk (writing the dummy into the qh
2110 * overlay, so qh->hw_token wrongly becomes inactive/halted), only fault
2111 * recovery (including urb dequeue) would need software changes to a QH...
2114 qh_refresh (struct fusbh200_hcd
*fusbh200
, struct fusbh200_qh
*qh
)
2116 struct fusbh200_qtd
*qtd
;
2118 if (list_empty (&qh
->qtd_list
))
2121 qtd
= list_entry (qh
->qtd_list
.next
,
2122 struct fusbh200_qtd
, qtd_list
);
2124 * first qtd may already be partially processed.
2125 * If we come here during unlink, the QH overlay region
2126 * might have reference to the just unlinked qtd. The
2127 * qtd is updated in qh_completions(). Update the QH
2130 if (cpu_to_hc32(fusbh200
, qtd
->qtd_dma
) == qh
->hw
->hw_current
) {
2131 qh
->hw
->hw_qtd_next
= qtd
->hw_next
;
2137 qh_update (fusbh200
, qh
, qtd
);
2140 /*-------------------------------------------------------------------------*/
2142 static void qh_link_async(struct fusbh200_hcd
*fusbh200
, struct fusbh200_qh
*qh
);
2144 static void fusbh200_clear_tt_buffer_complete(struct usb_hcd
*hcd
,
2145 struct usb_host_endpoint
*ep
)
2147 struct fusbh200_hcd
*fusbh200
= hcd_to_fusbh200(hcd
);
2148 struct fusbh200_qh
*qh
= ep
->hcpriv
;
2149 unsigned long flags
;
2151 spin_lock_irqsave(&fusbh200
->lock
, flags
);
2152 qh
->clearing_tt
= 0;
2153 if (qh
->qh_state
== QH_STATE_IDLE
&& !list_empty(&qh
->qtd_list
)
2154 && fusbh200
->rh_state
== FUSBH200_RH_RUNNING
)
2155 qh_link_async(fusbh200
, qh
);
2156 spin_unlock_irqrestore(&fusbh200
->lock
, flags
);
2159 static void fusbh200_clear_tt_buffer(struct fusbh200_hcd
*fusbh200
, struct fusbh200_qh
*qh
,
2160 struct urb
*urb
, u32 token
)
2163 /* If an async split transaction gets an error or is unlinked,
2164 * the TT buffer may be left in an indeterminate state. We
2165 * have to clear the TT buffer.
2167 * Note: this routine is never called for Isochronous transfers.
2169 if (urb
->dev
->tt
&& !usb_pipeint(urb
->pipe
) && !qh
->clearing_tt
) {
2170 struct usb_device
*tt
= urb
->dev
->tt
->hub
;
2173 "clear tt buffer port %d, a%d ep%d t%08x\n",
2174 urb
->dev
->ttport
, urb
->dev
->devnum
,
2175 usb_pipeendpoint(urb
->pipe
), token
);
2177 if (urb
->dev
->tt
->hub
!=
2178 fusbh200_to_hcd(fusbh200
)->self
.root_hub
) {
2179 if (usb_hub_clear_tt_buffer(urb
) == 0)
2180 qh
->clearing_tt
= 1;
2185 static int qtd_copy_status (
2186 struct fusbh200_hcd
*fusbh200
,
2192 int status
= -EINPROGRESS
;
2194 /* count IN/OUT bytes, not SETUP (even short packets) */
2195 if (likely (QTD_PID (token
) != 2))
2196 urb
->actual_length
+= length
- QTD_LENGTH (token
);
2198 /* don't modify error codes */
2199 if (unlikely(urb
->unlinked
))
2202 /* force cleanup after short read; not always an error */
2203 if (unlikely (IS_SHORT_READ (token
)))
2204 status
= -EREMOTEIO
;
2206 /* serious "can't proceed" faults reported by the hardware */
2207 if (token
& QTD_STS_HALT
) {
2208 if (token
& QTD_STS_BABBLE
) {
2209 /* FIXME "must" disable babbling device's port too */
2210 status
= -EOVERFLOW
;
2211 /* CERR nonzero + halt --> stall */
2212 } else if (QTD_CERR(token
)) {
2215 /* In theory, more than one of the following bits can be set
2216 * since they are sticky and the transaction is retried.
2217 * Which to test first is rather arbitrary.
2219 } else if (token
& QTD_STS_MMF
) {
2220 /* fs/ls interrupt xfer missed the complete-split */
2222 } else if (token
& QTD_STS_DBE
) {
2223 status
= (QTD_PID (token
) == 1) /* IN ? */
2224 ? -ENOSR
/* hc couldn't read data */
2225 : -ECOMM
; /* hc couldn't write data */
2226 } else if (token
& QTD_STS_XACT
) {
2227 /* timeout, bad CRC, wrong PID, etc */
2228 fusbh200_dbg(fusbh200
, "devpath %s ep%d%s 3strikes\n",
2230 usb_pipeendpoint(urb
->pipe
),
2231 usb_pipein(urb
->pipe
) ? "in" : "out");
2233 } else { /* unknown */
2237 fusbh200_dbg(fusbh200
,
2238 "dev%d ep%d%s qtd token %08x --> status %d\n",
2239 usb_pipedevice (urb
->pipe
),
2240 usb_pipeendpoint (urb
->pipe
),
2241 usb_pipein (urb
->pipe
) ? "in" : "out",
2249 fusbh200_urb_done(struct fusbh200_hcd
*fusbh200
, struct urb
*urb
, int status
)
2250 __releases(fusbh200
->lock
)
2251 __acquires(fusbh200
->lock
)
2253 if (likely (urb
->hcpriv
!= NULL
)) {
2254 struct fusbh200_qh
*qh
= (struct fusbh200_qh
*) urb
->hcpriv
;
2256 /* S-mask in a QH means it's an interrupt urb */
2257 if ((qh
->hw
->hw_info2
& cpu_to_hc32(fusbh200
, QH_SMASK
)) != 0) {
2259 /* ... update hc-wide periodic stats (for usbfs) */
2260 fusbh200_to_hcd(fusbh200
)->self
.bandwidth_int_reqs
--;
2264 if (unlikely(urb
->unlinked
)) {
2265 COUNT(fusbh200
->stats
.unlink
);
2267 /* report non-error and short read status as zero */
2268 if (status
== -EINPROGRESS
|| status
== -EREMOTEIO
)
2270 COUNT(fusbh200
->stats
.complete
);
2273 #ifdef FUSBH200_URB_TRACE
2274 fusbh200_dbg (fusbh200
,
2275 "%s %s urb %p ep%d%s status %d len %d/%d\n",
2276 __func__
, urb
->dev
->devpath
, urb
,
2277 usb_pipeendpoint (urb
->pipe
),
2278 usb_pipein (urb
->pipe
) ? "in" : "out",
2280 urb
->actual_length
, urb
->transfer_buffer_length
);
2283 /* complete() can reenter this HCD */
2284 usb_hcd_unlink_urb_from_ep(fusbh200_to_hcd(fusbh200
), urb
);
2285 spin_unlock (&fusbh200
->lock
);
2286 usb_hcd_giveback_urb(fusbh200_to_hcd(fusbh200
), urb
, status
);
2287 spin_lock (&fusbh200
->lock
);
2290 static int qh_schedule (struct fusbh200_hcd
*fusbh200
, struct fusbh200_qh
*qh
);
2293 * Process and free completed qtds for a qh, returning URBs to drivers.
2294 * Chases up to qh->hw_current. Returns number of completions called,
2295 * indicating how much "real" work we did.
2298 qh_completions (struct fusbh200_hcd
*fusbh200
, struct fusbh200_qh
*qh
)
2300 struct fusbh200_qtd
*last
, *end
= qh
->dummy
;
2301 struct list_head
*entry
, *tmp
;
2306 struct fusbh200_qh_hw
*hw
= qh
->hw
;
2308 if (unlikely (list_empty (&qh
->qtd_list
)))
2311 /* completions (or tasks on other cpus) must never clobber HALT
2312 * till we've gone through and cleaned everything up, even when
2313 * they add urbs to this qh's queue or mark them for unlinking.
2315 * NOTE: unlinking expects to be done in queue order.
2317 * It's a bug for qh->qh_state to be anything other than
2318 * QH_STATE_IDLE, unless our caller is scan_async() or
2321 state
= qh
->qh_state
;
2322 qh
->qh_state
= QH_STATE_COMPLETING
;
2323 stopped
= (state
== QH_STATE_IDLE
);
2327 last_status
= -EINPROGRESS
;
2328 qh
->needs_rescan
= 0;
2330 /* remove de-activated QTDs from front of queue.
2331 * after faults (including short reads), cleanup this urb
2332 * then let the queue advance.
2333 * if queue is stopped, handles unlinks.
2335 list_for_each_safe (entry
, tmp
, &qh
->qtd_list
) {
2336 struct fusbh200_qtd
*qtd
;
2340 qtd
= list_entry (entry
, struct fusbh200_qtd
, qtd_list
);
2343 /* clean up any state from previous QTD ...*/
2345 if (likely (last
->urb
!= urb
)) {
2346 fusbh200_urb_done(fusbh200
, last
->urb
, last_status
);
2348 last_status
= -EINPROGRESS
;
2350 fusbh200_qtd_free (fusbh200
, last
);
2354 /* ignore urbs submitted during completions we reported */
2358 /* hardware copies qtd out of qh overlay */
2360 token
= hc32_to_cpu(fusbh200
, qtd
->hw_token
);
2362 /* always clean up qtds the hc de-activated */
2364 if ((token
& QTD_STS_ACTIVE
) == 0) {
2366 /* Report Data Buffer Error: non-fatal but useful */
2367 if (token
& QTD_STS_DBE
)
2368 fusbh200_dbg(fusbh200
,
2369 "detected DataBufferErr for urb %p ep%d%s len %d, qtd %p [qh %p]\n",
2371 usb_endpoint_num(&urb
->ep
->desc
),
2372 usb_endpoint_dir_in(&urb
->ep
->desc
) ? "in" : "out",
2373 urb
->transfer_buffer_length
,
2377 /* on STALL, error, and short reads this urb must
2378 * complete and all its qtds must be recycled.
2380 if ((token
& QTD_STS_HALT
) != 0) {
2382 /* retry transaction errors until we
2383 * reach the software xacterr limit
2385 if ((token
& QTD_STS_XACT
) &&
2386 QTD_CERR(token
) == 0 &&
2387 ++qh
->xacterrs
< QH_XACTERR_MAX
&&
2389 fusbh200_dbg(fusbh200
,
2390 "detected XactErr len %zu/%zu retry %d\n",
2391 qtd
->length
- QTD_LENGTH(token
), qtd
->length
, qh
->xacterrs
);
2393 /* reset the token in the qtd and the
2394 * qh overlay (which still contains
2395 * the qtd) so that we pick up from
2398 token
&= ~QTD_STS_HALT
;
2399 token
|= QTD_STS_ACTIVE
|
2400 (FUSBH200_TUNE_CERR
<< 10);
2401 qtd
->hw_token
= cpu_to_hc32(fusbh200
,
2404 hw
->hw_token
= cpu_to_hc32(fusbh200
,
2410 /* magic dummy for some short reads; qh won't advance.
2411 * that silicon quirk can kick in with this dummy too.
2413 * other short reads won't stop the queue, including
2414 * control transfers (status stage handles that) or
2415 * most other single-qtd reads ... the queue stops if
2416 * URB_SHORT_NOT_OK was set so the driver submitting
2417 * the urbs could clean it up.
2419 } else if (IS_SHORT_READ (token
)
2420 && !(qtd
->hw_alt_next
2421 & FUSBH200_LIST_END(fusbh200
))) {
2425 /* stop scanning when we reach qtds the hc is using */
2426 } else if (likely (!stopped
2427 && fusbh200
->rh_state
>= FUSBH200_RH_RUNNING
)) {
2430 /* scan the whole queue for unlinks whenever it stops */
2434 /* cancel everything if we halt, suspend, etc */
2435 if (fusbh200
->rh_state
< FUSBH200_RH_RUNNING
)
2436 last_status
= -ESHUTDOWN
;
2438 /* this qtd is active; skip it unless a previous qtd
2439 * for its urb faulted, or its urb was canceled.
2441 else if (last_status
== -EINPROGRESS
&& !urb
->unlinked
)
2444 /* qh unlinked; token in overlay may be most current */
2445 if (state
== QH_STATE_IDLE
2446 && cpu_to_hc32(fusbh200
, qtd
->qtd_dma
)
2447 == hw
->hw_current
) {
2448 token
= hc32_to_cpu(fusbh200
, hw
->hw_token
);
2450 /* An unlink may leave an incomplete
2451 * async transaction in the TT buffer.
2452 * We have to clear it.
2454 fusbh200_clear_tt_buffer(fusbh200
, qh
, urb
, token
);
2458 /* unless we already know the urb's status, collect qtd status
2459 * and update count of bytes transferred. in common short read
2460 * cases with only one data qtd (including control transfers),
2461 * queue processing won't halt. but with two or more qtds (for
2462 * example, with a 32 KB transfer), when the first qtd gets a
2463 * short read the second must be removed by hand.
2465 if (last_status
== -EINPROGRESS
) {
2466 last_status
= qtd_copy_status(fusbh200
, urb
,
2467 qtd
->length
, token
);
2468 if (last_status
== -EREMOTEIO
2469 && (qtd
->hw_alt_next
2470 & FUSBH200_LIST_END(fusbh200
)))
2471 last_status
= -EINPROGRESS
;
2473 /* As part of low/full-speed endpoint-halt processing
2474 * we must clear the TT buffer (11.17.5).
2476 if (unlikely(last_status
!= -EINPROGRESS
&&
2477 last_status
!= -EREMOTEIO
)) {
2478 /* The TT's in some hubs malfunction when they
2479 * receive this request following a STALL (they
2480 * stop sending isochronous packets). Since a
2481 * STALL can't leave the TT buffer in a busy
2482 * state (if you believe Figures 11-48 - 11-51
2483 * in the USB 2.0 spec), we won't clear the TT
2484 * buffer in this case. Strictly speaking this
2485 * is a violation of the spec.
2487 if (last_status
!= -EPIPE
)
2488 fusbh200_clear_tt_buffer(fusbh200
, qh
, urb
,
2493 /* if we're removing something not at the queue head,
2494 * patch the hardware queue pointer.
2496 if (stopped
&& qtd
->qtd_list
.prev
!= &qh
->qtd_list
) {
2497 last
= list_entry (qtd
->qtd_list
.prev
,
2498 struct fusbh200_qtd
, qtd_list
);
2499 last
->hw_next
= qtd
->hw_next
;
2502 /* remove qtd; it's recycled after possible urb completion */
2503 list_del (&qtd
->qtd_list
);
2506 /* reinit the xacterr counter for the next qtd */
2510 /* last urb's completion might still need calling */
2511 if (likely (last
!= NULL
)) {
2512 fusbh200_urb_done(fusbh200
, last
->urb
, last_status
);
2514 fusbh200_qtd_free (fusbh200
, last
);
2517 /* Do we need to rescan for URBs dequeued during a giveback? */
2518 if (unlikely(qh
->needs_rescan
)) {
2519 /* If the QH is already unlinked, do the rescan now. */
2520 if (state
== QH_STATE_IDLE
)
2523 /* Otherwise we have to wait until the QH is fully unlinked.
2524 * Our caller will start an unlink if qh->needs_rescan is
2525 * set. But if an unlink has already started, nothing needs
2528 if (state
!= QH_STATE_LINKED
)
2529 qh
->needs_rescan
= 0;
2532 /* restore original state; caller must unlink or relink */
2533 qh
->qh_state
= state
;
2535 /* be sure the hardware's done with the qh before refreshing
2536 * it after fault cleanup, or recovering from silicon wrongly
2537 * overlaying the dummy qtd (which reduces DMA chatter).
2539 if (stopped
!= 0 || hw
->hw_qtd_next
== FUSBH200_LIST_END(fusbh200
)) {
2542 qh_refresh(fusbh200
, qh
);
2544 case QH_STATE_LINKED
:
2545 /* We won't refresh a QH that's linked (after the HC
2546 * stopped the queue). That avoids a race:
2547 * - HC reads first part of QH;
2548 * - CPU updates that first part and the token;
2549 * - HC reads rest of that QH, including token
2550 * Result: HC gets an inconsistent image, and then
2551 * DMAs to/from the wrong memory (corrupting it).
2553 * That should be rare for interrupt transfers,
2554 * except maybe high bandwidth ...
2557 /* Tell the caller to start an unlink */
2558 qh
->needs_rescan
= 1;
2560 /* otherwise, unlink already started */
2567 /*-------------------------------------------------------------------------*/
2569 // high bandwidth multiplier, as encoded in highspeed endpoint descriptors
2570 #define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
2571 // ... and packet size, for any kind of endpoint descriptor
2572 #define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff)
2575 * reverse of qh_urb_transaction: free a list of TDs.
2576 * used for cleanup after errors, before HC sees an URB's TDs.
2578 static void qtd_list_free (
2579 struct fusbh200_hcd
*fusbh200
,
2581 struct list_head
*qtd_list
2583 struct list_head
*entry
, *temp
;
2585 list_for_each_safe (entry
, temp
, qtd_list
) {
2586 struct fusbh200_qtd
*qtd
;
2588 qtd
= list_entry (entry
, struct fusbh200_qtd
, qtd_list
);
2589 list_del (&qtd
->qtd_list
);
2590 fusbh200_qtd_free (fusbh200
, qtd
);
2595 * create a list of filled qtds for this URB; won't link into qh.
2597 static struct list_head
*
2598 qh_urb_transaction (
2599 struct fusbh200_hcd
*fusbh200
,
2601 struct list_head
*head
,
2604 struct fusbh200_qtd
*qtd
, *qtd_prev
;
2606 int len
, this_sg_len
, maxpacket
;
2610 struct scatterlist
*sg
;
2613 * URBs map to sequences of QTDs: one logical transaction
2615 qtd
= fusbh200_qtd_alloc (fusbh200
, flags
);
2616 if (unlikely (!qtd
))
2618 list_add_tail (&qtd
->qtd_list
, head
);
2621 token
= QTD_STS_ACTIVE
;
2622 token
|= (FUSBH200_TUNE_CERR
<< 10);
2623 /* for split transactions, SplitXState initialized to zero */
2625 len
= urb
->transfer_buffer_length
;
2626 is_input
= usb_pipein (urb
->pipe
);
2627 if (usb_pipecontrol (urb
->pipe
)) {
2629 qtd_fill(fusbh200
, qtd
, urb
->setup_dma
,
2630 sizeof (struct usb_ctrlrequest
),
2631 token
| (2 /* "setup" */ << 8), 8);
2633 /* ... and always at least one more pid */
2634 token
^= QTD_TOGGLE
;
2636 qtd
= fusbh200_qtd_alloc (fusbh200
, flags
);
2637 if (unlikely (!qtd
))
2640 qtd_prev
->hw_next
= QTD_NEXT(fusbh200
, qtd
->qtd_dma
);
2641 list_add_tail (&qtd
->qtd_list
, head
);
2643 /* for zero length DATA stages, STATUS is always IN */
2645 token
|= (1 /* "in" */ << 8);
2649 * data transfer stage: buffer setup
2651 i
= urb
->num_mapped_sgs
;
2652 if (len
> 0 && i
> 0) {
2654 buf
= sg_dma_address(sg
);
2656 /* urb->transfer_buffer_length may be smaller than the
2657 * size of the scatterlist (or vice versa)
2659 this_sg_len
= min_t(int, sg_dma_len(sg
), len
);
2662 buf
= urb
->transfer_dma
;
2667 token
|= (1 /* "in" */ << 8);
2668 /* else it's already initted to "out" pid (0 << 8) */
2670 maxpacket
= max_packet(usb_maxpacket(urb
->dev
, urb
->pipe
, !is_input
));
2673 * buffer gets wrapped in one or more qtds;
2674 * last one may be "short" (including zero len)
2675 * and may serve as a control status ack
2680 this_qtd_len
= qtd_fill(fusbh200
, qtd
, buf
, this_sg_len
, token
,
2682 this_sg_len
-= this_qtd_len
;
2683 len
-= this_qtd_len
;
2684 buf
+= this_qtd_len
;
2687 * short reads advance to a "magic" dummy instead of the next
2688 * qtd ... that forces the queue to stop, for manual cleanup.
2689 * (this will usually be overridden later.)
2692 qtd
->hw_alt_next
= fusbh200
->async
->hw
->hw_alt_next
;
2694 /* qh makes control packets use qtd toggle; maybe switch it */
2695 if ((maxpacket
& (this_qtd_len
+ (maxpacket
- 1))) == 0)
2696 token
^= QTD_TOGGLE
;
2698 if (likely(this_sg_len
<= 0)) {
2699 if (--i
<= 0 || len
<= 0)
2702 buf
= sg_dma_address(sg
);
2703 this_sg_len
= min_t(int, sg_dma_len(sg
), len
);
2707 qtd
= fusbh200_qtd_alloc (fusbh200
, flags
);
2708 if (unlikely (!qtd
))
2711 qtd_prev
->hw_next
= QTD_NEXT(fusbh200
, qtd
->qtd_dma
);
2712 list_add_tail (&qtd
->qtd_list
, head
);
2716 * unless the caller requires manual cleanup after short reads,
2717 * have the alt_next mechanism keep the queue running after the
2718 * last data qtd (the only one, for control and most other cases).
2720 if (likely ((urb
->transfer_flags
& URB_SHORT_NOT_OK
) == 0
2721 || usb_pipecontrol (urb
->pipe
)))
2722 qtd
->hw_alt_next
= FUSBH200_LIST_END(fusbh200
);
2725 * control requests may need a terminating data "status" ack;
2726 * other OUT ones may need a terminating short packet
2729 if (likely (urb
->transfer_buffer_length
!= 0)) {
2732 if (usb_pipecontrol (urb
->pipe
)) {
2734 token
^= 0x0100; /* "in" <--> "out" */
2735 token
|= QTD_TOGGLE
; /* force DATA1 */
2736 } else if (usb_pipeout(urb
->pipe
)
2737 && (urb
->transfer_flags
& URB_ZERO_PACKET
)
2738 && !(urb
->transfer_buffer_length
% maxpacket
)) {
2743 qtd
= fusbh200_qtd_alloc (fusbh200
, flags
);
2744 if (unlikely (!qtd
))
2747 qtd_prev
->hw_next
= QTD_NEXT(fusbh200
, qtd
->qtd_dma
);
2748 list_add_tail (&qtd
->qtd_list
, head
);
2750 /* never any data in such packets */
2751 qtd_fill(fusbh200
, qtd
, 0, 0, token
, 0);
2755 /* by default, enable interrupt on urb completion */
2756 if (likely (!(urb
->transfer_flags
& URB_NO_INTERRUPT
)))
2757 qtd
->hw_token
|= cpu_to_hc32(fusbh200
, QTD_IOC
);
2761 qtd_list_free (fusbh200
, urb
, head
);
2765 /*-------------------------------------------------------------------------*/
2767 // Would be best to create all qh's from config descriptors,
2768 // when each interface/altsetting is established. Unlink
2769 // any previous qh and cancel its urbs first; endpoints are
2770 // implicitly reset then (data toggle too).
2771 // That'd mean updating how usbcore talks to HCDs. (2.7?)
2775 * Each QH holds a qtd list; a QH is used for everything except iso.
2777 * For interrupt urbs, the scheduler must set the microframe scheduling
2778 * mask(s) each time the QH gets scheduled. For highspeed, that's
2779 * just one microframe in the s-mask. For split interrupt transactions
2780 * there are additional complications: c-mask, maybe FSTNs.
2782 static struct fusbh200_qh
*
2784 struct fusbh200_hcd
*fusbh200
,
2788 struct fusbh200_qh
*qh
= fusbh200_qh_alloc (fusbh200
, flags
);
2789 u32 info1
= 0, info2
= 0;
2792 struct usb_tt
*tt
= urb
->dev
->tt
;
2793 struct fusbh200_qh_hw
*hw
;
2799 * init endpoint/device data for this QH
2801 info1
|= usb_pipeendpoint (urb
->pipe
) << 8;
2802 info1
|= usb_pipedevice (urb
->pipe
) << 0;
2804 is_input
= usb_pipein (urb
->pipe
);
2805 type
= usb_pipetype (urb
->pipe
);
2806 maxp
= usb_maxpacket (urb
->dev
, urb
->pipe
, !is_input
);
2808 /* 1024 byte maxpacket is a hardware ceiling. High bandwidth
2809 * acts like up to 3KB, but is built from smaller packets.
2811 if (max_packet(maxp
) > 1024) {
2812 fusbh200_dbg(fusbh200
, "bogus qh maxpacket %d\n", max_packet(maxp
));
2816 /* Compute interrupt scheduling parameters just once, and save.
2817 * - allowing for high bandwidth, how many nsec/uframe are used?
2818 * - split transactions need a second CSPLIT uframe; same question
2819 * - splits also need a schedule gap (for full/low speed I/O)
2820 * - qh has a polling interval
2822 * For control/bulk requests, the HC or TT handles these.
2824 if (type
== PIPE_INTERRUPT
) {
2825 qh
->usecs
= NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH
,
2827 hb_mult(maxp
) * max_packet(maxp
)));
2828 qh
->start
= NO_FRAME
;
2830 if (urb
->dev
->speed
== USB_SPEED_HIGH
) {
2834 qh
->period
= urb
->interval
>> 3;
2835 if (qh
->period
== 0 && urb
->interval
!= 1) {
2836 /* NOTE interval 2 or 4 uframes could work.
2837 * But interval 1 scheduling is simpler, and
2838 * includes high bandwidth.
2841 } else if (qh
->period
> fusbh200
->periodic_size
) {
2842 qh
->period
= fusbh200
->periodic_size
;
2843 urb
->interval
= qh
->period
<< 3;
2848 /* gap is f(FS/LS transfer times) */
2849 qh
->gap_uf
= 1 + usb_calc_bus_time (urb
->dev
->speed
,
2850 is_input
, 0, maxp
) / (125 * 1000);
2852 /* FIXME this just approximates SPLIT/CSPLIT times */
2853 if (is_input
) { // SPLIT, gap, CSPLIT+DATA
2854 qh
->c_usecs
= qh
->usecs
+ HS_USECS (0);
2855 qh
->usecs
= HS_USECS (1);
2856 } else { // SPLIT+DATA, gap, CSPLIT
2857 qh
->usecs
+= HS_USECS (1);
2858 qh
->c_usecs
= HS_USECS (0);
2861 think_time
= tt
? tt
->think_time
: 0;
2862 qh
->tt_usecs
= NS_TO_US (think_time
+
2863 usb_calc_bus_time (urb
->dev
->speed
,
2864 is_input
, 0, max_packet (maxp
)));
2865 qh
->period
= urb
->interval
;
2866 if (qh
->period
> fusbh200
->periodic_size
) {
2867 qh
->period
= fusbh200
->periodic_size
;
2868 urb
->interval
= qh
->period
;
2873 /* support for tt scheduling, and access to toggles */
2877 switch (urb
->dev
->speed
) {
2879 info1
|= QH_LOW_SPEED
;
2882 case USB_SPEED_FULL
:
2883 /* EPS 0 means "full" */
2884 if (type
!= PIPE_INTERRUPT
)
2885 info1
|= (FUSBH200_TUNE_RL_TT
<< 28);
2886 if (type
== PIPE_CONTROL
) {
2887 info1
|= QH_CONTROL_EP
; /* for TT */
2888 info1
|= QH_TOGGLE_CTL
; /* toggle from qtd */
2890 info1
|= maxp
<< 16;
2892 info2
|= (FUSBH200_TUNE_MULT_TT
<< 30);
2894 /* Some Freescale processors have an erratum in which the
2895 * port number in the queue head was 0..N-1 instead of 1..N.
2897 if (fusbh200_has_fsl_portno_bug(fusbh200
))
2898 info2
|= (urb
->dev
->ttport
-1) << 23;
2900 info2
|= urb
->dev
->ttport
<< 23;
2902 /* set the address of the TT; for TDI's integrated
2903 * root hub tt, leave it zeroed.
2905 if (tt
&& tt
->hub
!= fusbh200_to_hcd(fusbh200
)->self
.root_hub
)
2906 info2
|= tt
->hub
->devnum
<< 16;
2908 /* NOTE: if (PIPE_INTERRUPT) { scheduler sets c-mask } */
2912 case USB_SPEED_HIGH
: /* no TT involved */
2913 info1
|= QH_HIGH_SPEED
;
2914 if (type
== PIPE_CONTROL
) {
2915 info1
|= (FUSBH200_TUNE_RL_HS
<< 28);
2916 info1
|= 64 << 16; /* usb2 fixed maxpacket */
2917 info1
|= QH_TOGGLE_CTL
; /* toggle from qtd */
2918 info2
|= (FUSBH200_TUNE_MULT_HS
<< 30);
2919 } else if (type
== PIPE_BULK
) {
2920 info1
|= (FUSBH200_TUNE_RL_HS
<< 28);
2921 /* The USB spec says that high speed bulk endpoints
2922 * always use 512 byte maxpacket. But some device
2923 * vendors decided to ignore that, and MSFT is happy
2924 * to help them do so. So now people expect to use
2925 * such nonconformant devices with Linux too; sigh.
2927 info1
|= max_packet(maxp
) << 16;
2928 info2
|= (FUSBH200_TUNE_MULT_HS
<< 30);
2929 } else { /* PIPE_INTERRUPT */
2930 info1
|= max_packet (maxp
) << 16;
2931 info2
|= hb_mult (maxp
) << 30;
2935 fusbh200_dbg(fusbh200
, "bogus dev %p speed %d\n", urb
->dev
,
2938 qh_destroy(fusbh200
, qh
);
2942 /* NOTE: if (PIPE_INTERRUPT) { scheduler sets s-mask } */
2944 /* init as live, toggle clear, advance to dummy */
2945 qh
->qh_state
= QH_STATE_IDLE
;
2947 hw
->hw_info1
= cpu_to_hc32(fusbh200
, info1
);
2948 hw
->hw_info2
= cpu_to_hc32(fusbh200
, info2
);
2949 qh
->is_out
= !is_input
;
2950 usb_settoggle (urb
->dev
, usb_pipeendpoint (urb
->pipe
), !is_input
, 1);
2951 qh_refresh (fusbh200
, qh
);
2955 /*-------------------------------------------------------------------------*/
2957 static void enable_async(struct fusbh200_hcd
*fusbh200
)
2959 if (fusbh200
->async_count
++)
2962 /* Stop waiting to turn off the async schedule */
2963 fusbh200
->enabled_hrtimer_events
&= ~BIT(FUSBH200_HRTIMER_DISABLE_ASYNC
);
2965 /* Don't start the schedule until ASS is 0 */
2966 fusbh200_poll_ASS(fusbh200
);
2967 turn_on_io_watchdog(fusbh200
);
2970 static void disable_async(struct fusbh200_hcd
*fusbh200
)
2972 if (--fusbh200
->async_count
)
2975 /* The async schedule and async_unlink list are supposed to be empty */
2976 WARN_ON(fusbh200
->async
->qh_next
.qh
|| fusbh200
->async_unlink
);
2978 /* Don't turn off the schedule until ASS is 1 */
2979 fusbh200_poll_ASS(fusbh200
);
2982 /* move qh (and its qtds) onto async queue; maybe enable queue. */
2984 static void qh_link_async (struct fusbh200_hcd
*fusbh200
, struct fusbh200_qh
*qh
)
2986 __hc32 dma
= QH_NEXT(fusbh200
, qh
->qh_dma
);
2987 struct fusbh200_qh
*head
;
2989 /* Don't link a QH if there's a Clear-TT-Buffer pending */
2990 if (unlikely(qh
->clearing_tt
))
2993 WARN_ON(qh
->qh_state
!= QH_STATE_IDLE
);
2995 /* clear halt and/or toggle; and maybe recover from silicon quirk */
2996 qh_refresh(fusbh200
, qh
);
2998 /* splice right after start */
2999 head
= fusbh200
->async
;
3000 qh
->qh_next
= head
->qh_next
;
3001 qh
->hw
->hw_next
= head
->hw
->hw_next
;
3004 head
->qh_next
.qh
= qh
;
3005 head
->hw
->hw_next
= dma
;
3008 qh
->qh_state
= QH_STATE_LINKED
;
3009 /* qtd completions reported later by interrupt */
3011 enable_async(fusbh200
);
3014 /*-------------------------------------------------------------------------*/
3017 * For control/bulk/interrupt, return QH with these TDs appended.
3018 * Allocates and initializes the QH if necessary.
3019 * Returns null if it can't allocate a QH it needs to.
3020 * If the QH has TDs (urbs) already, that's great.
3022 static struct fusbh200_qh
*qh_append_tds (
3023 struct fusbh200_hcd
*fusbh200
,
3025 struct list_head
*qtd_list
,
3030 struct fusbh200_qh
*qh
= NULL
;
3031 __hc32 qh_addr_mask
= cpu_to_hc32(fusbh200
, 0x7f);
3033 qh
= (struct fusbh200_qh
*) *ptr
;
3034 if (unlikely (qh
== NULL
)) {
3035 /* can't sleep here, we have fusbh200->lock... */
3036 qh
= qh_make (fusbh200
, urb
, GFP_ATOMIC
);
3039 if (likely (qh
!= NULL
)) {
3040 struct fusbh200_qtd
*qtd
;
3042 if (unlikely (list_empty (qtd_list
)))
3045 qtd
= list_entry (qtd_list
->next
, struct fusbh200_qtd
,
3048 /* control qh may need patching ... */
3049 if (unlikely (epnum
== 0)) {
3051 /* usb_reset_device() briefly reverts to address 0 */
3052 if (usb_pipedevice (urb
->pipe
) == 0)
3053 qh
->hw
->hw_info1
&= ~qh_addr_mask
;
3056 /* just one way to queue requests: swap with the dummy qtd.
3057 * only hc or qh_refresh() ever modify the overlay.
3059 if (likely (qtd
!= NULL
)) {
3060 struct fusbh200_qtd
*dummy
;
3064 /* to avoid racing the HC, use the dummy td instead of
3065 * the first td of our list (becomes new dummy). both
3066 * tds stay deactivated until we're done, when the
3067 * HC is allowed to fetch the old dummy (4.10.2).
3069 token
= qtd
->hw_token
;
3070 qtd
->hw_token
= HALT_BIT(fusbh200
);
3074 dma
= dummy
->qtd_dma
;
3076 dummy
->qtd_dma
= dma
;
3078 list_del (&qtd
->qtd_list
);
3079 list_add (&dummy
->qtd_list
, qtd_list
);
3080 list_splice_tail(qtd_list
, &qh
->qtd_list
);
3082 fusbh200_qtd_init(fusbh200
, qtd
, qtd
->qtd_dma
);
3085 /* hc must see the new dummy at list end */
3087 qtd
= list_entry (qh
->qtd_list
.prev
,
3088 struct fusbh200_qtd
, qtd_list
);
3089 qtd
->hw_next
= QTD_NEXT(fusbh200
, dma
);
3091 /* let the hc process these next qtds */
3093 dummy
->hw_token
= token
;
3101 /*-------------------------------------------------------------------------*/
3105 struct fusbh200_hcd
*fusbh200
,
3107 struct list_head
*qtd_list
,
3111 unsigned long flags
;
3112 struct fusbh200_qh
*qh
= NULL
;
3115 epnum
= urb
->ep
->desc
.bEndpointAddress
;
3117 #ifdef FUSBH200_URB_TRACE
3119 struct fusbh200_qtd
*qtd
;
3120 qtd
= list_entry(qtd_list
->next
, struct fusbh200_qtd
, qtd_list
);
3121 fusbh200_dbg(fusbh200
,
3122 "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n",
3123 __func__
, urb
->dev
->devpath
, urb
,
3124 epnum
& 0x0f, (epnum
& USB_DIR_IN
) ? "in" : "out",
3125 urb
->transfer_buffer_length
,
3126 qtd
, urb
->ep
->hcpriv
);
3130 spin_lock_irqsave (&fusbh200
->lock
, flags
);
3131 if (unlikely(!HCD_HW_ACCESSIBLE(fusbh200_to_hcd(fusbh200
)))) {
3135 rc
= usb_hcd_link_urb_to_ep(fusbh200_to_hcd(fusbh200
), urb
);
3139 qh
= qh_append_tds(fusbh200
, urb
, qtd_list
, epnum
, &urb
->ep
->hcpriv
);
3140 if (unlikely(qh
== NULL
)) {
3141 usb_hcd_unlink_urb_from_ep(fusbh200_to_hcd(fusbh200
), urb
);
3146 /* Control/bulk operations through TTs don't need scheduling,
3147 * the HC and TT handle it when the TT has a buffer ready.
3149 if (likely (qh
->qh_state
== QH_STATE_IDLE
))
3150 qh_link_async(fusbh200
, qh
);
3152 spin_unlock_irqrestore (&fusbh200
->lock
, flags
);
3153 if (unlikely (qh
== NULL
))
3154 qtd_list_free (fusbh200
, urb
, qtd_list
);
3158 /*-------------------------------------------------------------------------*/
3160 static void single_unlink_async(struct fusbh200_hcd
*fusbh200
, struct fusbh200_qh
*qh
)
3162 struct fusbh200_qh
*prev
;
3164 /* Add to the end of the list of QHs waiting for the next IAAD */
3165 qh
->qh_state
= QH_STATE_UNLINK
;
3166 if (fusbh200
->async_unlink
)
3167 fusbh200
->async_unlink_last
->unlink_next
= qh
;
3169 fusbh200
->async_unlink
= qh
;
3170 fusbh200
->async_unlink_last
= qh
;
3172 /* Unlink it from the schedule */
3173 prev
= fusbh200
->async
;
3174 while (prev
->qh_next
.qh
!= qh
)
3175 prev
= prev
->qh_next
.qh
;
3177 prev
->hw
->hw_next
= qh
->hw
->hw_next
;
3178 prev
->qh_next
= qh
->qh_next
;
3179 if (fusbh200
->qh_scan_next
== qh
)
3180 fusbh200
->qh_scan_next
= qh
->qh_next
.qh
;
3183 static void start_iaa_cycle(struct fusbh200_hcd
*fusbh200
, bool nested
)
3186 * Do nothing if an IAA cycle is already running or
3187 * if one will be started shortly.
3189 if (fusbh200
->async_iaa
|| fusbh200
->async_unlinking
)
3192 /* Do all the waiting QHs at once */
3193 fusbh200
->async_iaa
= fusbh200
->async_unlink
;
3194 fusbh200
->async_unlink
= NULL
;
3196 /* If the controller isn't running, we don't have to wait for it */
3197 if (unlikely(fusbh200
->rh_state
< FUSBH200_RH_RUNNING
)) {
3198 if (!nested
) /* Avoid recursion */
3199 end_unlink_async(fusbh200
);
3201 /* Otherwise start a new IAA cycle */
3202 } else if (likely(fusbh200
->rh_state
== FUSBH200_RH_RUNNING
)) {
3203 /* Make sure the unlinks are all visible to the hardware */
3206 fusbh200_writel(fusbh200
, fusbh200
->command
| CMD_IAAD
,
3207 &fusbh200
->regs
->command
);
3208 fusbh200_readl(fusbh200
, &fusbh200
->regs
->command
);
3209 fusbh200_enable_event(fusbh200
, FUSBH200_HRTIMER_IAA_WATCHDOG
, true);
3213 /* the async qh for the qtds being unlinked are now gone from the HC */
3215 static void end_unlink_async(struct fusbh200_hcd
*fusbh200
)
3217 struct fusbh200_qh
*qh
;
3219 /* Process the idle QHs */
3221 fusbh200
->async_unlinking
= true;
3222 while (fusbh200
->async_iaa
) {
3223 qh
= fusbh200
->async_iaa
;
3224 fusbh200
->async_iaa
= qh
->unlink_next
;
3225 qh
->unlink_next
= NULL
;
3227 qh
->qh_state
= QH_STATE_IDLE
;
3228 qh
->qh_next
.qh
= NULL
;
3230 qh_completions(fusbh200
, qh
);
3231 if (!list_empty(&qh
->qtd_list
) &&
3232 fusbh200
->rh_state
== FUSBH200_RH_RUNNING
)
3233 qh_link_async(fusbh200
, qh
);
3234 disable_async(fusbh200
);
3236 fusbh200
->async_unlinking
= false;
3238 /* Start a new IAA cycle if any QHs are waiting for it */
3239 if (fusbh200
->async_unlink
) {
3240 start_iaa_cycle(fusbh200
, true);
3241 if (unlikely(fusbh200
->rh_state
< FUSBH200_RH_RUNNING
))
3246 static void unlink_empty_async(struct fusbh200_hcd
*fusbh200
)
3248 struct fusbh200_qh
*qh
, *next
;
3249 bool stopped
= (fusbh200
->rh_state
< FUSBH200_RH_RUNNING
);
3250 bool check_unlinks_later
= false;
3252 /* Unlink all the async QHs that have been empty for a timer cycle */
3253 next
= fusbh200
->async
->qh_next
.qh
;
3256 next
= qh
->qh_next
.qh
;
3258 if (list_empty(&qh
->qtd_list
) &&
3259 qh
->qh_state
== QH_STATE_LINKED
) {
3260 if (!stopped
&& qh
->unlink_cycle
==
3261 fusbh200
->async_unlink_cycle
)
3262 check_unlinks_later
= true;
3264 single_unlink_async(fusbh200
, qh
);
3268 /* Start a new IAA cycle if any QHs are waiting for it */
3269 if (fusbh200
->async_unlink
)
3270 start_iaa_cycle(fusbh200
, false);
3272 /* QHs that haven't been empty for long enough will be handled later */
3273 if (check_unlinks_later
) {
3274 fusbh200_enable_event(fusbh200
, FUSBH200_HRTIMER_ASYNC_UNLINKS
, true);
3275 ++fusbh200
->async_unlink_cycle
;
3279 /* makes sure the async qh will become idle */
3280 /* caller must own fusbh200->lock */
3282 static void start_unlink_async(struct fusbh200_hcd
*fusbh200
, struct fusbh200_qh
*qh
)
3285 * If the QH isn't linked then there's nothing we can do
3286 * unless we were called during a giveback, in which case
3287 * qh_completions() has to deal with it.
3289 if (qh
->qh_state
!= QH_STATE_LINKED
) {
3290 if (qh
->qh_state
== QH_STATE_COMPLETING
)
3291 qh
->needs_rescan
= 1;
3295 single_unlink_async(fusbh200
, qh
);
3296 start_iaa_cycle(fusbh200
, false);
3299 /*-------------------------------------------------------------------------*/
3301 static void scan_async (struct fusbh200_hcd
*fusbh200
)
3303 struct fusbh200_qh
*qh
;
3304 bool check_unlinks_later
= false;
3306 fusbh200
->qh_scan_next
= fusbh200
->async
->qh_next
.qh
;
3307 while (fusbh200
->qh_scan_next
) {
3308 qh
= fusbh200
->qh_scan_next
;
3309 fusbh200
->qh_scan_next
= qh
->qh_next
.qh
;
3311 /* clean any finished work for this qh */
3312 if (!list_empty(&qh
->qtd_list
)) {
3316 * Unlinks could happen here; completion reporting
3317 * drops the lock. That's why fusbh200->qh_scan_next
3318 * always holds the next qh to scan; if the next qh
3319 * gets unlinked then fusbh200->qh_scan_next is adjusted
3320 * in single_unlink_async().
3322 temp
= qh_completions(fusbh200
, qh
);
3323 if (qh
->needs_rescan
) {
3324 start_unlink_async(fusbh200
, qh
);
3325 } else if (list_empty(&qh
->qtd_list
)
3326 && qh
->qh_state
== QH_STATE_LINKED
) {
3327 qh
->unlink_cycle
= fusbh200
->async_unlink_cycle
;
3328 check_unlinks_later
= true;
3329 } else if (temp
!= 0)
3335 * Unlink empty entries, reducing DMA usage as well
3336 * as HCD schedule-scanning costs. Delay for any qh
3337 * we just scanned, there's a not-unusual case that it
3338 * doesn't stay idle for long.
3340 if (check_unlinks_later
&& fusbh200
->rh_state
== FUSBH200_RH_RUNNING
&&
3341 !(fusbh200
->enabled_hrtimer_events
&
3342 BIT(FUSBH200_HRTIMER_ASYNC_UNLINKS
))) {
3343 fusbh200_enable_event(fusbh200
, FUSBH200_HRTIMER_ASYNC_UNLINKS
, true);
3344 ++fusbh200
->async_unlink_cycle
;
3347 /*-------------------------------------------------------------------------*/
3349 * EHCI scheduled transaction support: interrupt, iso, split iso
3350 * These are called "periodic" transactions in the EHCI spec.
3352 * Note that for interrupt transfers, the QH/QTD manipulation is shared
3353 * with the "asynchronous" transaction support (control/bulk transfers).
3354 * The only real difference is in how interrupt transfers are scheduled.
3356 * For ISO, we make an "iso_stream" head to serve the same role as a QH.
3357 * It keeps track of every ITD (or SITD) that's linked, and holds enough
3358 * pre-calculated schedule data to make appending to the queue be quick.
3361 static int fusbh200_get_frame (struct usb_hcd
*hcd
);
3363 /*-------------------------------------------------------------------------*/
3366 * periodic_next_shadow - return "next" pointer on shadow list
3367 * @periodic: host pointer to qh/itd
3368 * @tag: hardware tag for type of this record
3370 static union fusbh200_shadow
*
3371 periodic_next_shadow(struct fusbh200_hcd
*fusbh200
, union fusbh200_shadow
*periodic
,
3374 switch (hc32_to_cpu(fusbh200
, tag
)) {
3376 return &periodic
->qh
->qh_next
;
3378 return &periodic
->fstn
->fstn_next
;
3380 return &periodic
->itd
->itd_next
;
3385 shadow_next_periodic(struct fusbh200_hcd
*fusbh200
, union fusbh200_shadow
*periodic
,
3388 switch (hc32_to_cpu(fusbh200
, tag
)) {
3389 /* our fusbh200_shadow.qh is actually software part */
3391 return &periodic
->qh
->hw
->hw_next
;
3392 /* others are hw parts */
3394 return periodic
->hw_next
;
3398 /* caller must hold fusbh200->lock */
3399 static void periodic_unlink (struct fusbh200_hcd
*fusbh200
, unsigned frame
, void *ptr
)
3401 union fusbh200_shadow
*prev_p
= &fusbh200
->pshadow
[frame
];
3402 __hc32
*hw_p
= &fusbh200
->periodic
[frame
];
3403 union fusbh200_shadow here
= *prev_p
;
3405 /* find predecessor of "ptr"; hw and shadow lists are in sync */
3406 while (here
.ptr
&& here
.ptr
!= ptr
) {
3407 prev_p
= periodic_next_shadow(fusbh200
, prev_p
,
3408 Q_NEXT_TYPE(fusbh200
, *hw_p
));
3409 hw_p
= shadow_next_periodic(fusbh200
, &here
,
3410 Q_NEXT_TYPE(fusbh200
, *hw_p
));
3413 /* an interrupt entry (at list end) could have been shared */
3417 /* update shadow and hardware lists ... the old "next" pointers
3418 * from ptr may still be in use, the caller updates them.
3420 *prev_p
= *periodic_next_shadow(fusbh200
, &here
,
3421 Q_NEXT_TYPE(fusbh200
, *hw_p
));
3423 *hw_p
= *shadow_next_periodic(fusbh200
, &here
,
3424 Q_NEXT_TYPE(fusbh200
, *hw_p
));
3427 /* how many of the uframe's 125 usecs are allocated? */
3428 static unsigned short
3429 periodic_usecs (struct fusbh200_hcd
*fusbh200
, unsigned frame
, unsigned uframe
)
3431 __hc32
*hw_p
= &fusbh200
->periodic
[frame
];
3432 union fusbh200_shadow
*q
= &fusbh200
->pshadow
[frame
];
3434 struct fusbh200_qh_hw
*hw
;
3437 switch (hc32_to_cpu(fusbh200
, Q_NEXT_TYPE(fusbh200
, *hw_p
))) {
3440 /* is it in the S-mask? */
3441 if (hw
->hw_info2
& cpu_to_hc32(fusbh200
, 1 << uframe
))
3442 usecs
+= q
->qh
->usecs
;
3443 /* ... or C-mask? */
3444 if (hw
->hw_info2
& cpu_to_hc32(fusbh200
,
3446 usecs
+= q
->qh
->c_usecs
;
3447 hw_p
= &hw
->hw_next
;
3448 q
= &q
->qh
->qh_next
;
3450 // case Q_TYPE_FSTN:
3452 /* for "save place" FSTNs, count the relevant INTR
3453 * bandwidth from the previous frame
3455 if (q
->fstn
->hw_prev
!= FUSBH200_LIST_END(fusbh200
)) {
3456 fusbh200_dbg (fusbh200
, "ignoring FSTN cost ...\n");
3458 hw_p
= &q
->fstn
->hw_next
;
3459 q
= &q
->fstn
->fstn_next
;
3462 if (q
->itd
->hw_transaction
[uframe
])
3463 usecs
+= q
->itd
->stream
->usecs
;
3464 hw_p
= &q
->itd
->hw_next
;
3465 q
= &q
->itd
->itd_next
;
3469 if (usecs
> fusbh200
->uframe_periodic_max
)
3470 fusbh200_err (fusbh200
, "uframe %d sched overrun: %d usecs\n",
3471 frame
* 8 + uframe
, usecs
);
3475 /*-------------------------------------------------------------------------*/
3477 static int same_tt (struct usb_device
*dev1
, struct usb_device
*dev2
)
3479 if (!dev1
->tt
|| !dev2
->tt
)
3481 if (dev1
->tt
!= dev2
->tt
)
3483 if (dev1
->tt
->multi
)
3484 return dev1
->ttport
== dev2
->ttport
;
3489 /* return true iff the device's transaction translator is available
3490 * for a periodic transfer starting at the specified frame, using
3491 * all the uframes in the mask.
3493 static int tt_no_collision (
3494 struct fusbh200_hcd
*fusbh200
,
3496 struct usb_device
*dev
,
3501 if (period
== 0) /* error */
3504 /* note bandwidth wastage: split never follows csplit
3505 * (different dev or endpoint) until the next uframe.
3506 * calling convention doesn't make that distinction.
3508 for (; frame
< fusbh200
->periodic_size
; frame
+= period
) {
3509 union fusbh200_shadow here
;
3511 struct fusbh200_qh_hw
*hw
;
3513 here
= fusbh200
->pshadow
[frame
];
3514 type
= Q_NEXT_TYPE(fusbh200
, fusbh200
->periodic
[frame
]);
3516 switch (hc32_to_cpu(fusbh200
, type
)) {
3518 type
= Q_NEXT_TYPE(fusbh200
, here
.itd
->hw_next
);
3519 here
= here
.itd
->itd_next
;
3523 if (same_tt (dev
, here
.qh
->dev
)) {
3526 mask
= hc32_to_cpu(fusbh200
,
3528 /* "knows" no gap is needed */
3533 type
= Q_NEXT_TYPE(fusbh200
, hw
->hw_next
);
3534 here
= here
.qh
->qh_next
;
3536 // case Q_TYPE_FSTN:
3538 fusbh200_dbg (fusbh200
,
3539 "periodic frame %d bogus type %d\n",
3543 /* collision or error */
3552 /*-------------------------------------------------------------------------*/
3554 static void enable_periodic(struct fusbh200_hcd
*fusbh200
)
3556 if (fusbh200
->periodic_count
++)
3559 /* Stop waiting to turn off the periodic schedule */
3560 fusbh200
->enabled_hrtimer_events
&= ~BIT(FUSBH200_HRTIMER_DISABLE_PERIODIC
);
3562 /* Don't start the schedule until PSS is 0 */
3563 fusbh200_poll_PSS(fusbh200
);
3564 turn_on_io_watchdog(fusbh200
);
3567 static void disable_periodic(struct fusbh200_hcd
*fusbh200
)
3569 if (--fusbh200
->periodic_count
)
3572 /* Don't turn off the schedule until PSS is 1 */
3573 fusbh200_poll_PSS(fusbh200
);
3576 /*-------------------------------------------------------------------------*/
3578 /* periodic schedule slots have iso tds (normal or split) first, then a
3579 * sparse tree for active interrupt transfers.
3581 * this just links in a qh; caller guarantees uframe masks are set right.
3582 * no FSTN support (yet; fusbh200 0.96+)
3584 static void qh_link_periodic(struct fusbh200_hcd
*fusbh200
, struct fusbh200_qh
*qh
)
3587 unsigned period
= qh
->period
;
3589 dev_dbg (&qh
->dev
->dev
,
3590 "link qh%d-%04x/%p start %d [%d/%d us]\n",
3591 period
, hc32_to_cpup(fusbh200
, &qh
->hw
->hw_info2
)
3592 & (QH_CMASK
| QH_SMASK
),
3593 qh
, qh
->start
, qh
->usecs
, qh
->c_usecs
);
3595 /* high bandwidth, or otherwise every microframe */
3599 for (i
= qh
->start
; i
< fusbh200
->periodic_size
; i
+= period
) {
3600 union fusbh200_shadow
*prev
= &fusbh200
->pshadow
[i
];
3601 __hc32
*hw_p
= &fusbh200
->periodic
[i
];
3602 union fusbh200_shadow here
= *prev
;
3605 /* skip the iso nodes at list head */
3607 type
= Q_NEXT_TYPE(fusbh200
, *hw_p
);
3608 if (type
== cpu_to_hc32(fusbh200
, Q_TYPE_QH
))
3610 prev
= periodic_next_shadow(fusbh200
, prev
, type
);
3611 hw_p
= shadow_next_periodic(fusbh200
, &here
, type
);
3615 /* sorting each branch by period (slow-->fast)
3616 * enables sharing interior tree nodes
3618 while (here
.ptr
&& qh
!= here
.qh
) {
3619 if (qh
->period
> here
.qh
->period
)
3621 prev
= &here
.qh
->qh_next
;
3622 hw_p
= &here
.qh
->hw
->hw_next
;
3625 /* link in this qh, unless some earlier pass did that */
3626 if (qh
!= here
.qh
) {
3629 qh
->hw
->hw_next
= *hw_p
;
3632 *hw_p
= QH_NEXT (fusbh200
, qh
->qh_dma
);
3635 qh
->qh_state
= QH_STATE_LINKED
;
3638 /* update per-qh bandwidth for usbfs */
3639 fusbh200_to_hcd(fusbh200
)->self
.bandwidth_allocated
+= qh
->period
3640 ? ((qh
->usecs
+ qh
->c_usecs
) / qh
->period
)
3643 list_add(&qh
->intr_node
, &fusbh200
->intr_qh_list
);
3645 /* maybe enable periodic schedule processing */
3646 ++fusbh200
->intr_count
;
3647 enable_periodic(fusbh200
);
3650 static void qh_unlink_periodic(struct fusbh200_hcd
*fusbh200
, struct fusbh200_qh
*qh
)
3656 * If qh is for a low/full-speed device, simply unlinking it
3657 * could interfere with an ongoing split transaction. To unlink
3658 * it safely would require setting the QH_INACTIVATE bit and
3659 * waiting at least one frame, as described in EHCI 4.12.2.5.
3661 * We won't bother with any of this. Instead, we assume that the
3662 * only reason for unlinking an interrupt QH while the current URB
3663 * is still active is to dequeue all the URBs (flush the whole
3666 * If rebalancing the periodic schedule is ever implemented, this
3667 * approach will no longer be valid.
3670 /* high bandwidth, or otherwise part of every microframe */
3671 if ((period
= qh
->period
) == 0)
3674 for (i
= qh
->start
; i
< fusbh200
->periodic_size
; i
+= period
)
3675 periodic_unlink (fusbh200
, i
, qh
);
3677 /* update per-qh bandwidth for usbfs */
3678 fusbh200_to_hcd(fusbh200
)->self
.bandwidth_allocated
-= qh
->period
3679 ? ((qh
->usecs
+ qh
->c_usecs
) / qh
->period
)
3682 dev_dbg (&qh
->dev
->dev
,
3683 "unlink qh%d-%04x/%p start %d [%d/%d us]\n",
3685 hc32_to_cpup(fusbh200
, &qh
->hw
->hw_info2
) & (QH_CMASK
| QH_SMASK
),
3686 qh
, qh
->start
, qh
->usecs
, qh
->c_usecs
);
3688 /* qh->qh_next still "live" to HC */
3689 qh
->qh_state
= QH_STATE_UNLINK
;
3690 qh
->qh_next
.ptr
= NULL
;
3692 if (fusbh200
->qh_scan_next
== qh
)
3693 fusbh200
->qh_scan_next
= list_entry(qh
->intr_node
.next
,
3694 struct fusbh200_qh
, intr_node
);
3695 list_del(&qh
->intr_node
);
3698 static void start_unlink_intr(struct fusbh200_hcd
*fusbh200
, struct fusbh200_qh
*qh
)
3700 /* If the QH isn't linked then there's nothing we can do
3701 * unless we were called during a giveback, in which case
3702 * qh_completions() has to deal with it.
3704 if (qh
->qh_state
!= QH_STATE_LINKED
) {
3705 if (qh
->qh_state
== QH_STATE_COMPLETING
)
3706 qh
->needs_rescan
= 1;
3710 qh_unlink_periodic (fusbh200
, qh
);
3712 /* Make sure the unlinks are visible before starting the timer */
3716 * The EHCI spec doesn't say how long it takes the controller to
3717 * stop accessing an unlinked interrupt QH. The timer delay is
3718 * 9 uframes; presumably that will be long enough.
3720 qh
->unlink_cycle
= fusbh200
->intr_unlink_cycle
;
3722 /* New entries go at the end of the intr_unlink list */
3723 if (fusbh200
->intr_unlink
)
3724 fusbh200
->intr_unlink_last
->unlink_next
= qh
;
3726 fusbh200
->intr_unlink
= qh
;
3727 fusbh200
->intr_unlink_last
= qh
;
3729 if (fusbh200
->intr_unlinking
)
3730 ; /* Avoid recursive calls */
3731 else if (fusbh200
->rh_state
< FUSBH200_RH_RUNNING
)
3732 fusbh200_handle_intr_unlinks(fusbh200
);
3733 else if (fusbh200
->intr_unlink
== qh
) {
3734 fusbh200_enable_event(fusbh200
, FUSBH200_HRTIMER_UNLINK_INTR
, true);
3735 ++fusbh200
->intr_unlink_cycle
;
3739 static void end_unlink_intr(struct fusbh200_hcd
*fusbh200
, struct fusbh200_qh
*qh
)
3741 struct fusbh200_qh_hw
*hw
= qh
->hw
;
3744 qh
->qh_state
= QH_STATE_IDLE
;
3745 hw
->hw_next
= FUSBH200_LIST_END(fusbh200
);
3747 qh_completions(fusbh200
, qh
);
3749 /* reschedule QH iff another request is queued */
3750 if (!list_empty(&qh
->qtd_list
) && fusbh200
->rh_state
== FUSBH200_RH_RUNNING
) {
3751 rc
= qh_schedule(fusbh200
, qh
);
3753 /* An error here likely indicates handshake failure
3754 * or no space left in the schedule. Neither fault
3755 * should happen often ...
3757 * FIXME kill the now-dysfunctional queued urbs
3760 fusbh200_err(fusbh200
, "can't reschedule qh %p, err %d\n",
3764 /* maybe turn off periodic schedule */
3765 --fusbh200
->intr_count
;
3766 disable_periodic(fusbh200
);
3769 /*-------------------------------------------------------------------------*/
3771 static int check_period (
3772 struct fusbh200_hcd
*fusbh200
,
3780 /* complete split running into next frame?
3781 * given FSTN support, we could sometimes check...
3786 /* convert "usecs we need" to "max already claimed" */
3787 usecs
= fusbh200
->uframe_periodic_max
- usecs
;
3789 /* we "know" 2 and 4 uframe intervals were rejected; so
3790 * for period 0, check _every_ microframe in the schedule.
3792 if (unlikely (period
== 0)) {
3794 for (uframe
= 0; uframe
< 7; uframe
++) {
3795 claimed
= periodic_usecs (fusbh200
, frame
, uframe
);
3796 if (claimed
> usecs
)
3799 } while ((frame
+= 1) < fusbh200
->periodic_size
);
3801 /* just check the specified uframe, at that period */
3804 claimed
= periodic_usecs (fusbh200
, frame
, uframe
);
3805 if (claimed
> usecs
)
3807 } while ((frame
+= period
) < fusbh200
->periodic_size
);
3814 static int check_intr_schedule (
3815 struct fusbh200_hcd
*fusbh200
,
3818 const struct fusbh200_qh
*qh
,
3822 int retval
= -ENOSPC
;
3825 if (qh
->c_usecs
&& uframe
>= 6) /* FSTN territory? */
3828 if (!check_period (fusbh200
, frame
, uframe
, qh
->period
, qh
->usecs
))
3836 /* Make sure this tt's buffer is also available for CSPLITs.
3837 * We pessimize a bit; probably the typical full speed case
3838 * doesn't need the second CSPLIT.
3840 * NOTE: both SPLIT and CSPLIT could be checked in just
3843 mask
= 0x03 << (uframe
+ qh
->gap_uf
);
3844 *c_maskp
= cpu_to_hc32(fusbh200
, mask
<< 8);
3846 mask
|= 1 << uframe
;
3847 if (tt_no_collision (fusbh200
, qh
->period
, qh
->dev
, frame
, mask
)) {
3848 if (!check_period (fusbh200
, frame
, uframe
+ qh
->gap_uf
+ 1,
3849 qh
->period
, qh
->c_usecs
))
3851 if (!check_period (fusbh200
, frame
, uframe
+ qh
->gap_uf
,
3852 qh
->period
, qh
->c_usecs
))
3860 /* "first fit" scheduling policy used the first time through,
3861 * or when the previous schedule slot can't be re-used.
3863 static int qh_schedule(struct fusbh200_hcd
*fusbh200
, struct fusbh200_qh
*qh
)
3868 unsigned frame
; /* 0..(qh->period - 1), or NO_FRAME */
3869 struct fusbh200_qh_hw
*hw
= qh
->hw
;
3871 qh_refresh(fusbh200
, qh
);
3872 hw
->hw_next
= FUSBH200_LIST_END(fusbh200
);
3875 /* reuse the previous schedule slots, if we can */
3876 if (frame
< qh
->period
) {
3877 uframe
= ffs(hc32_to_cpup(fusbh200
, &hw
->hw_info2
) & QH_SMASK
);
3878 status
= check_intr_schedule (fusbh200
, frame
, --uframe
,
3886 /* else scan the schedule to find a group of slots such that all
3887 * uframes have enough periodic bandwidth available.
3890 /* "normal" case, uframing flexible except with splits */
3894 for (i
= qh
->period
; status
&& i
> 0; --i
) {
3895 frame
= ++fusbh200
->random_frame
% qh
->period
;
3896 for (uframe
= 0; uframe
< 8; uframe
++) {
3897 status
= check_intr_schedule (fusbh200
,
3905 /* qh->period == 0 means every uframe */
3908 status
= check_intr_schedule (fusbh200
, 0, 0, qh
, &c_mask
);
3914 /* reset S-frame and (maybe) C-frame masks */
3915 hw
->hw_info2
&= cpu_to_hc32(fusbh200
, ~(QH_CMASK
| QH_SMASK
));
3916 hw
->hw_info2
|= qh
->period
3917 ? cpu_to_hc32(fusbh200
, 1 << uframe
)
3918 : cpu_to_hc32(fusbh200
, QH_SMASK
);
3919 hw
->hw_info2
|= c_mask
;
3921 fusbh200_dbg (fusbh200
, "reused qh %p schedule\n", qh
);
3923 /* stuff into the periodic schedule */
3924 qh_link_periodic(fusbh200
, qh
);
3929 static int intr_submit (
3930 struct fusbh200_hcd
*fusbh200
,
3932 struct list_head
*qtd_list
,
3936 unsigned long flags
;
3937 struct fusbh200_qh
*qh
;
3939 struct list_head empty
;
3941 /* get endpoint and transfer/schedule data */
3942 epnum
= urb
->ep
->desc
.bEndpointAddress
;
3944 spin_lock_irqsave (&fusbh200
->lock
, flags
);
3946 if (unlikely(!HCD_HW_ACCESSIBLE(fusbh200_to_hcd(fusbh200
)))) {
3947 status
= -ESHUTDOWN
;
3948 goto done_not_linked
;
3950 status
= usb_hcd_link_urb_to_ep(fusbh200_to_hcd(fusbh200
), urb
);
3951 if (unlikely(status
))
3952 goto done_not_linked
;
3954 /* get qh and force any scheduling errors */
3955 INIT_LIST_HEAD (&empty
);
3956 qh
= qh_append_tds(fusbh200
, urb
, &empty
, epnum
, &urb
->ep
->hcpriv
);
3961 if (qh
->qh_state
== QH_STATE_IDLE
) {
3962 if ((status
= qh_schedule (fusbh200
, qh
)) != 0)
3966 /* then queue the urb's tds to the qh */
3967 qh
= qh_append_tds(fusbh200
, urb
, qtd_list
, epnum
, &urb
->ep
->hcpriv
);
3968 BUG_ON (qh
== NULL
);
3970 /* ... update usbfs periodic stats */
3971 fusbh200_to_hcd(fusbh200
)->self
.bandwidth_int_reqs
++;
3974 if (unlikely(status
))
3975 usb_hcd_unlink_urb_from_ep(fusbh200_to_hcd(fusbh200
), urb
);
3977 spin_unlock_irqrestore (&fusbh200
->lock
, flags
);
3979 qtd_list_free (fusbh200
, urb
, qtd_list
);
3984 static void scan_intr(struct fusbh200_hcd
*fusbh200
)
3986 struct fusbh200_qh
*qh
;
3988 list_for_each_entry_safe(qh
, fusbh200
->qh_scan_next
, &fusbh200
->intr_qh_list
,
3991 /* clean any finished work for this qh */
3992 if (!list_empty(&qh
->qtd_list
)) {
3996 * Unlinks could happen here; completion reporting
3997 * drops the lock. That's why fusbh200->qh_scan_next
3998 * always holds the next qh to scan; if the next qh
3999 * gets unlinked then fusbh200->qh_scan_next is adjusted
4000 * in qh_unlink_periodic().
4002 temp
= qh_completions(fusbh200
, qh
);
4003 if (unlikely(qh
->needs_rescan
||
4004 (list_empty(&qh
->qtd_list
) &&
4005 qh
->qh_state
== QH_STATE_LINKED
)))
4006 start_unlink_intr(fusbh200
, qh
);
4013 /*-------------------------------------------------------------------------*/
4015 /* fusbh200_iso_stream ops work with both ITD and SITD */
4017 static struct fusbh200_iso_stream
*
4018 iso_stream_alloc (gfp_t mem_flags
)
4020 struct fusbh200_iso_stream
*stream
;
4022 stream
= kzalloc(sizeof *stream
, mem_flags
);
4023 if (likely (stream
!= NULL
)) {
4024 INIT_LIST_HEAD(&stream
->td_list
);
4025 INIT_LIST_HEAD(&stream
->free_list
);
4026 stream
->next_uframe
= -1;
4033 struct fusbh200_hcd
*fusbh200
,
4034 struct fusbh200_iso_stream
*stream
,
4035 struct usb_device
*dev
,
4041 unsigned epnum
, maxp
;
4047 * this might be a "high bandwidth" highspeed endpoint,
4048 * as encoded in the ep descriptor's wMaxPacket field
4050 epnum
= usb_pipeendpoint (pipe
);
4051 is_input
= usb_pipein (pipe
) ? USB_DIR_IN
: 0;
4052 maxp
= usb_maxpacket(dev
, pipe
, !is_input
);
4059 maxp
= max_packet(maxp
);
4060 multi
= hb_mult(maxp
);
4064 stream
->buf0
= cpu_to_hc32(fusbh200
, (epnum
<< 8) | dev
->devnum
);
4065 stream
->buf1
= cpu_to_hc32(fusbh200
, buf1
);
4066 stream
->buf2
= cpu_to_hc32(fusbh200
, multi
);
4068 /* usbfs wants to report the average usecs per frame tied up
4069 * when transfers on this endpoint are scheduled ...
4071 if (dev
->speed
== USB_SPEED_FULL
) {
4073 stream
->usecs
= NS_TO_US(usb_calc_bus_time(dev
->speed
,
4074 is_input
, 1, maxp
));
4077 stream
->highspeed
= 1;
4078 stream
->usecs
= HS_USECS_ISO (maxp
);
4080 bandwidth
= stream
->usecs
* 8;
4081 bandwidth
/= interval
;
4083 stream
->bandwidth
= bandwidth
;
4085 stream
->bEndpointAddress
= is_input
| epnum
;
4086 stream
->interval
= interval
;
4087 stream
->maxp
= maxp
;
4090 static struct fusbh200_iso_stream
*
4091 iso_stream_find (struct fusbh200_hcd
*fusbh200
, struct urb
*urb
)
4094 struct fusbh200_iso_stream
*stream
;
4095 struct usb_host_endpoint
*ep
;
4096 unsigned long flags
;
4098 epnum
= usb_pipeendpoint (urb
->pipe
);
4099 if (usb_pipein(urb
->pipe
))
4100 ep
= urb
->dev
->ep_in
[epnum
];
4102 ep
= urb
->dev
->ep_out
[epnum
];
4104 spin_lock_irqsave (&fusbh200
->lock
, flags
);
4105 stream
= ep
->hcpriv
;
4107 if (unlikely (stream
== NULL
)) {
4108 stream
= iso_stream_alloc(GFP_ATOMIC
);
4109 if (likely (stream
!= NULL
)) {
4110 ep
->hcpriv
= stream
;
4112 iso_stream_init(fusbh200
, stream
, urb
->dev
, urb
->pipe
,
4116 /* if dev->ep [epnum] is a QH, hw is set */
4117 } else if (unlikely (stream
->hw
!= NULL
)) {
4118 fusbh200_dbg (fusbh200
, "dev %s ep%d%s, not iso??\n",
4119 urb
->dev
->devpath
, epnum
,
4120 usb_pipein(urb
->pipe
) ? "in" : "out");
4124 spin_unlock_irqrestore (&fusbh200
->lock
, flags
);
4128 /*-------------------------------------------------------------------------*/
4130 /* fusbh200_iso_sched ops can be ITD-only or SITD-only */
4132 static struct fusbh200_iso_sched
*
4133 iso_sched_alloc (unsigned packets
, gfp_t mem_flags
)
4135 struct fusbh200_iso_sched
*iso_sched
;
4136 int size
= sizeof *iso_sched
;
4138 size
+= packets
* sizeof (struct fusbh200_iso_packet
);
4139 iso_sched
= kzalloc(size
, mem_flags
);
4140 if (likely (iso_sched
!= NULL
)) {
4141 INIT_LIST_HEAD (&iso_sched
->td_list
);
4148 struct fusbh200_hcd
*fusbh200
,
4149 struct fusbh200_iso_sched
*iso_sched
,
4150 struct fusbh200_iso_stream
*stream
,
4155 dma_addr_t dma
= urb
->transfer_dma
;
4157 /* how many uframes are needed for these transfers */
4158 iso_sched
->span
= urb
->number_of_packets
* stream
->interval
;
4160 /* figure out per-uframe itd fields that we'll need later
4161 * when we fit new itds into the schedule.
4163 for (i
= 0; i
< urb
->number_of_packets
; i
++) {
4164 struct fusbh200_iso_packet
*uframe
= &iso_sched
->packet
[i
];
4169 length
= urb
->iso_frame_desc
[i
].length
;
4170 buf
= dma
+ urb
->iso_frame_desc
[i
].offset
;
4172 trans
= FUSBH200_ISOC_ACTIVE
;
4173 trans
|= buf
& 0x0fff;
4174 if (unlikely (((i
+ 1) == urb
->number_of_packets
))
4175 && !(urb
->transfer_flags
& URB_NO_INTERRUPT
))
4176 trans
|= FUSBH200_ITD_IOC
;
4177 trans
|= length
<< 16;
4178 uframe
->transaction
= cpu_to_hc32(fusbh200
, trans
);
4180 /* might need to cross a buffer page within a uframe */
4181 uframe
->bufp
= (buf
& ~(u64
)0x0fff);
4183 if (unlikely ((uframe
->bufp
!= (buf
& ~(u64
)0x0fff))))
4190 struct fusbh200_iso_stream
*stream
,
4191 struct fusbh200_iso_sched
*iso_sched
4196 // caller must hold fusbh200->lock!
4197 list_splice (&iso_sched
->td_list
, &stream
->free_list
);
4202 itd_urb_transaction (
4203 struct fusbh200_iso_stream
*stream
,
4204 struct fusbh200_hcd
*fusbh200
,
4209 struct fusbh200_itd
*itd
;
4213 struct fusbh200_iso_sched
*sched
;
4214 unsigned long flags
;
4216 sched
= iso_sched_alloc (urb
->number_of_packets
, mem_flags
);
4217 if (unlikely (sched
== NULL
))
4220 itd_sched_init(fusbh200
, sched
, stream
, urb
);
4222 if (urb
->interval
< 8)
4223 num_itds
= 1 + (sched
->span
+ 7) / 8;
4225 num_itds
= urb
->number_of_packets
;
4227 /* allocate/init ITDs */
4228 spin_lock_irqsave (&fusbh200
->lock
, flags
);
4229 for (i
= 0; i
< num_itds
; i
++) {
4232 * Use iTDs from the free list, but not iTDs that may
4233 * still be in use by the hardware.
4235 if (likely(!list_empty(&stream
->free_list
))) {
4236 itd
= list_first_entry(&stream
->free_list
,
4237 struct fusbh200_itd
, itd_list
);
4238 if (itd
->frame
== fusbh200
->now_frame
)
4240 list_del (&itd
->itd_list
);
4241 itd_dma
= itd
->itd_dma
;
4244 spin_unlock_irqrestore (&fusbh200
->lock
, flags
);
4245 itd
= dma_pool_alloc (fusbh200
->itd_pool
, mem_flags
,
4247 spin_lock_irqsave (&fusbh200
->lock
, flags
);
4249 iso_sched_free(stream
, sched
);
4250 spin_unlock_irqrestore(&fusbh200
->lock
, flags
);
4255 memset (itd
, 0, sizeof *itd
);
4256 itd
->itd_dma
= itd_dma
;
4257 list_add (&itd
->itd_list
, &sched
->td_list
);
4259 spin_unlock_irqrestore (&fusbh200
->lock
, flags
);
4261 /* temporarily store schedule info in hcpriv */
4262 urb
->hcpriv
= sched
;
4263 urb
->error_count
= 0;
4267 /*-------------------------------------------------------------------------*/
4271 struct fusbh200_hcd
*fusbh200
,
4280 /* can't commit more than uframe_periodic_max usec */
4281 if (periodic_usecs (fusbh200
, uframe
>> 3, uframe
& 0x7)
4282 > (fusbh200
->uframe_periodic_max
- usecs
))
4285 /* we know urb->interval is 2^N uframes */
4287 } while (uframe
< mod
);
4292 * This scheduler plans almost as far into the future as it has actual
4293 * periodic schedule slots. (Affected by TUNE_FLS, which defaults to
4294 * "as small as possible" to be cache-friendlier.) That limits the size
4295 * transfers you can stream reliably; avoid more than 64 msec per urb.
4296 * Also avoid queue depths of less than fusbh200's worst irq latency (affected
4297 * by the per-urb URB_NO_INTERRUPT hint, the log2_irq_thresh module parameter,
4298 * and other factors); or more than about 230 msec total (for portability,
4299 * given FUSBH200_TUNE_FLS and the slop). Or, write a smarter scheduler!
4302 #define SCHEDULE_SLOP 80 /* microframes */
4305 iso_stream_schedule (
4306 struct fusbh200_hcd
*fusbh200
,
4308 struct fusbh200_iso_stream
*stream
4311 u32 now
, next
, start
, period
, span
;
4313 unsigned mod
= fusbh200
->periodic_size
<< 3;
4314 struct fusbh200_iso_sched
*sched
= urb
->hcpriv
;
4316 period
= urb
->interval
;
4319 if (span
> mod
- SCHEDULE_SLOP
) {
4320 fusbh200_dbg (fusbh200
, "iso request %p too long\n", urb
);
4325 now
= fusbh200_read_frame_index(fusbh200
) & (mod
- 1);
4327 /* Typical case: reuse current schedule, stream is still active.
4328 * Hopefully there are no gaps from the host falling behind
4329 * (irq delays etc), but if there are we'll take the next
4330 * slot in the schedule, implicitly assuming URB_ISO_ASAP.
4332 if (likely (!list_empty (&stream
->td_list
))) {
4335 /* For high speed devices, allow scheduling within the
4336 * isochronous scheduling threshold. For full speed devices
4337 * and Intel PCI-based controllers, don't (work around for
4340 if (!stream
->highspeed
&& fusbh200
->fs_i_thresh
)
4341 next
= now
+ fusbh200
->i_thresh
;
4345 /* Fell behind (by up to twice the slop amount)?
4346 * We decide based on the time of the last currently-scheduled
4347 * slot, not the time of the next available slot.
4349 excess
= (stream
->next_uframe
- period
- next
) & (mod
- 1);
4350 if (excess
>= mod
- 2 * SCHEDULE_SLOP
)
4351 start
= next
+ excess
- mod
+ period
*
4352 DIV_ROUND_UP(mod
- excess
, period
);
4354 start
= next
+ excess
+ period
;
4355 if (start
- now
>= mod
) {
4356 fusbh200_dbg(fusbh200
, "request %p would overflow (%d+%d >= %d)\n",
4357 urb
, start
- now
- period
, period
,
4364 /* need to schedule; when's the next (u)frame we could start?
4365 * this is bigger than fusbh200->i_thresh allows; scheduling itself
4366 * isn't free, the slop should handle reasonably slow cpus. it
4367 * can also help high bandwidth if the dma and irq loads don't
4368 * jump until after the queue is primed.
4372 start
= SCHEDULE_SLOP
+ (now
& ~0x07);
4374 /* NOTE: assumes URB_ISO_ASAP, to limit complexity/bugs */
4376 /* find a uframe slot with enough bandwidth.
4377 * Early uframes are more precious because full-speed
4378 * iso IN transfers can't use late uframes,
4379 * and therefore they should be allocated last.
4385 /* check schedule: enough space? */
4386 if (itd_slot_ok(fusbh200
, mod
, start
,
4387 stream
->usecs
, period
))
4389 } while (start
> next
&& !done
);
4391 /* no room in the schedule */
4393 fusbh200_dbg(fusbh200
, "iso resched full %p (now %d max %d)\n",
4394 urb
, now
, now
+ mod
);
4400 /* Tried to schedule too far into the future? */
4401 if (unlikely(start
- now
+ span
- period
4402 >= mod
- 2 * SCHEDULE_SLOP
)) {
4403 fusbh200_dbg(fusbh200
, "request %p would overflow (%d+%d >= %d)\n",
4404 urb
, start
- now
, span
- period
,
4405 mod
- 2 * SCHEDULE_SLOP
);
4410 stream
->next_uframe
= start
& (mod
- 1);
4412 /* report high speed start in uframes; full speed, in frames */
4413 urb
->start_frame
= stream
->next_uframe
;
4414 if (!stream
->highspeed
)
4415 urb
->start_frame
>>= 3;
4417 /* Make sure scan_isoc() sees these */
4418 if (fusbh200
->isoc_count
== 0)
4419 fusbh200
->next_frame
= now
>> 3;
4423 iso_sched_free(stream
, sched
);
4428 /*-------------------------------------------------------------------------*/
4431 itd_init(struct fusbh200_hcd
*fusbh200
, struct fusbh200_iso_stream
*stream
,
4432 struct fusbh200_itd
*itd
)
4436 /* it's been recently zeroed */
4437 itd
->hw_next
= FUSBH200_LIST_END(fusbh200
);
4438 itd
->hw_bufp
[0] = stream
->buf0
;
4439 itd
->hw_bufp
[1] = stream
->buf1
;
4440 itd
->hw_bufp
[2] = stream
->buf2
;
4442 for (i
= 0; i
< 8; i
++)
4445 /* All other fields are filled when scheduling */
4450 struct fusbh200_hcd
*fusbh200
,
4451 struct fusbh200_itd
*itd
,
4452 struct fusbh200_iso_sched
*iso_sched
,
4457 struct fusbh200_iso_packet
*uf
= &iso_sched
->packet
[index
];
4458 unsigned pg
= itd
->pg
;
4460 // BUG_ON (pg == 6 && uf->cross);
4463 itd
->index
[uframe
] = index
;
4465 itd
->hw_transaction
[uframe
] = uf
->transaction
;
4466 itd
->hw_transaction
[uframe
] |= cpu_to_hc32(fusbh200
, pg
<< 12);
4467 itd
->hw_bufp
[pg
] |= cpu_to_hc32(fusbh200
, uf
->bufp
& ~(u32
)0);
4468 itd
->hw_bufp_hi
[pg
] |= cpu_to_hc32(fusbh200
, (u32
)(uf
->bufp
>> 32));
4470 /* iso_frame_desc[].offset must be strictly increasing */
4471 if (unlikely (uf
->cross
)) {
4472 u64 bufp
= uf
->bufp
+ 4096;
4475 itd
->hw_bufp
[pg
] |= cpu_to_hc32(fusbh200
, bufp
& ~(u32
)0);
4476 itd
->hw_bufp_hi
[pg
] |= cpu_to_hc32(fusbh200
, (u32
)(bufp
>> 32));
4481 itd_link (struct fusbh200_hcd
*fusbh200
, unsigned frame
, struct fusbh200_itd
*itd
)
4483 union fusbh200_shadow
*prev
= &fusbh200
->pshadow
[frame
];
4484 __hc32
*hw_p
= &fusbh200
->periodic
[frame
];
4485 union fusbh200_shadow here
= *prev
;
4488 /* skip any iso nodes which might belong to previous microframes */
4490 type
= Q_NEXT_TYPE(fusbh200
, *hw_p
);
4491 if (type
== cpu_to_hc32(fusbh200
, Q_TYPE_QH
))
4493 prev
= periodic_next_shadow(fusbh200
, prev
, type
);
4494 hw_p
= shadow_next_periodic(fusbh200
, &here
, type
);
4498 itd
->itd_next
= here
;
4499 itd
->hw_next
= *hw_p
;
4503 *hw_p
= cpu_to_hc32(fusbh200
, itd
->itd_dma
| Q_TYPE_ITD
);
4506 /* fit urb's itds into the selected schedule slot; activate as needed */
4507 static void itd_link_urb(
4508 struct fusbh200_hcd
*fusbh200
,
4511 struct fusbh200_iso_stream
*stream
4515 unsigned next_uframe
, uframe
, frame
;
4516 struct fusbh200_iso_sched
*iso_sched
= urb
->hcpriv
;
4517 struct fusbh200_itd
*itd
;
4519 next_uframe
= stream
->next_uframe
& (mod
- 1);
4521 if (unlikely (list_empty(&stream
->td_list
))) {
4522 fusbh200_to_hcd(fusbh200
)->self
.bandwidth_allocated
4523 += stream
->bandwidth
;
4524 fusbh200_dbg(fusbh200
,
4525 "schedule devp %s ep%d%s-iso period %d start %d.%d\n",
4526 urb
->dev
->devpath
, stream
->bEndpointAddress
& 0x0f,
4527 (stream
->bEndpointAddress
& USB_DIR_IN
) ? "in" : "out",
4529 next_uframe
>> 3, next_uframe
& 0x7);
4532 /* fill iTDs uframe by uframe */
4533 for (packet
= 0, itd
= NULL
; packet
< urb
->number_of_packets
; ) {
4535 /* ASSERT: we have all necessary itds */
4536 // BUG_ON (list_empty (&iso_sched->td_list));
4538 /* ASSERT: no itds for this endpoint in this uframe */
4540 itd
= list_entry (iso_sched
->td_list
.next
,
4541 struct fusbh200_itd
, itd_list
);
4542 list_move_tail (&itd
->itd_list
, &stream
->td_list
);
4543 itd
->stream
= stream
;
4545 itd_init (fusbh200
, stream
, itd
);
4548 uframe
= next_uframe
& 0x07;
4549 frame
= next_uframe
>> 3;
4551 itd_patch(fusbh200
, itd
, iso_sched
, packet
, uframe
);
4553 next_uframe
+= stream
->interval
;
4554 next_uframe
&= mod
- 1;
4557 /* link completed itds into the schedule */
4558 if (((next_uframe
>> 3) != frame
)
4559 || packet
== urb
->number_of_packets
) {
4560 itd_link(fusbh200
, frame
& (fusbh200
->periodic_size
- 1), itd
);
4564 stream
->next_uframe
= next_uframe
;
4566 /* don't need that schedule data any more */
4567 iso_sched_free (stream
, iso_sched
);
4570 ++fusbh200
->isoc_count
;
4571 enable_periodic(fusbh200
);
4574 #define ISO_ERRS (FUSBH200_ISOC_BUF_ERR | FUSBH200_ISOC_BABBLE | FUSBH200_ISOC_XACTERR)
4576 /* Process and recycle a completed ITD. Return true iff its urb completed,
4577 * and hence its completion callback probably added things to the hardware
4580 * Note that we carefully avoid recycling this descriptor until after any
4581 * completion callback runs, so that it won't be reused quickly. That is,
4582 * assuming (a) no more than two urbs per frame on this endpoint, and also
4583 * (b) only this endpoint's completions submit URBs. It seems some silicon
4584 * corrupts things if you reuse completed descriptors very quickly...
4586 static bool itd_complete(struct fusbh200_hcd
*fusbh200
, struct fusbh200_itd
*itd
)
4588 struct urb
*urb
= itd
->urb
;
4589 struct usb_iso_packet_descriptor
*desc
;
4593 struct fusbh200_iso_stream
*stream
= itd
->stream
;
4594 struct usb_device
*dev
;
4595 bool retval
= false;
4597 /* for each uframe with a packet */
4598 for (uframe
= 0; uframe
< 8; uframe
++) {
4599 if (likely (itd
->index
[uframe
] == -1))
4601 urb_index
= itd
->index
[uframe
];
4602 desc
= &urb
->iso_frame_desc
[urb_index
];
4604 t
= hc32_to_cpup(fusbh200
, &itd
->hw_transaction
[uframe
]);
4605 itd
->hw_transaction
[uframe
] = 0;
4607 /* report transfer status */
4608 if (unlikely (t
& ISO_ERRS
)) {
4610 if (t
& FUSBH200_ISOC_BUF_ERR
)
4611 desc
->status
= usb_pipein (urb
->pipe
)
4612 ? -ENOSR
/* hc couldn't read */
4613 : -ECOMM
; /* hc couldn't write */
4614 else if (t
& FUSBH200_ISOC_BABBLE
)
4615 desc
->status
= -EOVERFLOW
;
4616 else /* (t & FUSBH200_ISOC_XACTERR) */
4617 desc
->status
= -EPROTO
;
4619 /* HC need not update length with this error */
4620 if (!(t
& FUSBH200_ISOC_BABBLE
)) {
4621 desc
->actual_length
= fusbh200_itdlen(urb
, desc
, t
);
4622 urb
->actual_length
+= desc
->actual_length
;
4624 } else if (likely ((t
& FUSBH200_ISOC_ACTIVE
) == 0)) {
4626 desc
->actual_length
= fusbh200_itdlen(urb
, desc
, t
);
4627 urb
->actual_length
+= desc
->actual_length
;
4629 /* URB was too late */
4630 desc
->status
= -EXDEV
;
4634 /* handle completion now? */
4635 if (likely ((urb_index
+ 1) != urb
->number_of_packets
))
4638 /* ASSERT: it's really the last itd for this urb
4639 list_for_each_entry (itd, &stream->td_list, itd_list)
4640 BUG_ON (itd->urb == urb);
4643 /* give urb back to the driver; completion often (re)submits */
4645 fusbh200_urb_done(fusbh200
, urb
, 0);
4649 --fusbh200
->isoc_count
;
4650 disable_periodic(fusbh200
);
4652 if (unlikely(list_is_singular(&stream
->td_list
))) {
4653 fusbh200_to_hcd(fusbh200
)->self
.bandwidth_allocated
4654 -= stream
->bandwidth
;
4655 fusbh200_dbg(fusbh200
,
4656 "deschedule devp %s ep%d%s-iso\n",
4657 dev
->devpath
, stream
->bEndpointAddress
& 0x0f,
4658 (stream
->bEndpointAddress
& USB_DIR_IN
) ? "in" : "out");
4664 /* Add to the end of the free list for later reuse */
4665 list_move_tail(&itd
->itd_list
, &stream
->free_list
);
4667 /* Recycle the iTDs when the pipeline is empty (ep no longer in use) */
4668 if (list_empty(&stream
->td_list
)) {
4669 list_splice_tail_init(&stream
->free_list
,
4670 &fusbh200
->cached_itd_list
);
4671 start_free_itds(fusbh200
);
4677 /*-------------------------------------------------------------------------*/
4679 static int itd_submit (struct fusbh200_hcd
*fusbh200
, struct urb
*urb
,
4682 int status
= -EINVAL
;
4683 unsigned long flags
;
4684 struct fusbh200_iso_stream
*stream
;
4686 /* Get iso_stream head */
4687 stream
= iso_stream_find (fusbh200
, urb
);
4688 if (unlikely (stream
== NULL
)) {
4689 fusbh200_dbg (fusbh200
, "can't get iso stream\n");
4692 if (unlikely (urb
->interval
!= stream
->interval
&&
4693 fusbh200_port_speed(fusbh200
, 0) == USB_PORT_STAT_HIGH_SPEED
)) {
4694 fusbh200_dbg (fusbh200
, "can't change iso interval %d --> %d\n",
4695 stream
->interval
, urb
->interval
);
4699 #ifdef FUSBH200_URB_TRACE
4700 fusbh200_dbg (fusbh200
,
4701 "%s %s urb %p ep%d%s len %d, %d pkts %d uframes [%p]\n",
4702 __func__
, urb
->dev
->devpath
, urb
,
4703 usb_pipeendpoint (urb
->pipe
),
4704 usb_pipein (urb
->pipe
) ? "in" : "out",
4705 urb
->transfer_buffer_length
,
4706 urb
->number_of_packets
, urb
->interval
,
4710 /* allocate ITDs w/o locking anything */
4711 status
= itd_urb_transaction (stream
, fusbh200
, urb
, mem_flags
);
4712 if (unlikely (status
< 0)) {
4713 fusbh200_dbg (fusbh200
, "can't init itds\n");
4717 /* schedule ... need to lock */
4718 spin_lock_irqsave (&fusbh200
->lock
, flags
);
4719 if (unlikely(!HCD_HW_ACCESSIBLE(fusbh200_to_hcd(fusbh200
)))) {
4720 status
= -ESHUTDOWN
;
4721 goto done_not_linked
;
4723 status
= usb_hcd_link_urb_to_ep(fusbh200_to_hcd(fusbh200
), urb
);
4724 if (unlikely(status
))
4725 goto done_not_linked
;
4726 status
= iso_stream_schedule(fusbh200
, urb
, stream
);
4727 if (likely (status
== 0))
4728 itd_link_urb (fusbh200
, urb
, fusbh200
->periodic_size
<< 3, stream
);
4730 usb_hcd_unlink_urb_from_ep(fusbh200_to_hcd(fusbh200
), urb
);
4732 spin_unlock_irqrestore (&fusbh200
->lock
, flags
);
4737 /*-------------------------------------------------------------------------*/
4739 static void scan_isoc(struct fusbh200_hcd
*fusbh200
)
4741 unsigned uf
, now_frame
, frame
;
4742 unsigned fmask
= fusbh200
->periodic_size
- 1;
4743 bool modified
, live
;
4746 * When running, scan from last scan point up to "now"
4747 * else clean up by scanning everything that's left.
4748 * Touches as few pages as possible: cache-friendly.
4750 if (fusbh200
->rh_state
>= FUSBH200_RH_RUNNING
) {
4751 uf
= fusbh200_read_frame_index(fusbh200
);
4752 now_frame
= (uf
>> 3) & fmask
;
4755 now_frame
= (fusbh200
->next_frame
- 1) & fmask
;
4758 fusbh200
->now_frame
= now_frame
;
4760 frame
= fusbh200
->next_frame
;
4762 union fusbh200_shadow q
, *q_p
;
4766 /* scan each element in frame's queue for completions */
4767 q_p
= &fusbh200
->pshadow
[frame
];
4768 hw_p
= &fusbh200
->periodic
[frame
];
4770 type
= Q_NEXT_TYPE(fusbh200
, *hw_p
);
4773 while (q
.ptr
!= NULL
) {
4774 switch (hc32_to_cpu(fusbh200
, type
)) {
4776 /* If this ITD is still active, leave it for
4777 * later processing ... check the next entry.
4778 * No need to check for activity unless the
4781 if (frame
== now_frame
&& live
) {
4783 for (uf
= 0; uf
< 8; uf
++) {
4784 if (q
.itd
->hw_transaction
[uf
] &
4785 ITD_ACTIVE(fusbh200
))
4789 q_p
= &q
.itd
->itd_next
;
4790 hw_p
= &q
.itd
->hw_next
;
4791 type
= Q_NEXT_TYPE(fusbh200
,
4798 /* Take finished ITDs out of the schedule
4799 * and process them: recycle, maybe report
4800 * URB completion. HC won't cache the
4801 * pointer for much longer, if at all.
4803 *q_p
= q
.itd
->itd_next
;
4804 *hw_p
= q
.itd
->hw_next
;
4805 type
= Q_NEXT_TYPE(fusbh200
, q
.itd
->hw_next
);
4807 modified
= itd_complete (fusbh200
, q
.itd
);
4811 fusbh200_dbg(fusbh200
, "corrupt type %d frame %d shadow %p\n",
4812 type
, frame
, q
.ptr
);
4817 /* End of the iTDs and siTDs */
4822 /* assume completion callbacks modify the queue */
4823 if (unlikely(modified
&& fusbh200
->isoc_count
> 0))
4827 /* Stop when we have reached the current frame */
4828 if (frame
== now_frame
)
4830 frame
= (frame
+ 1) & fmask
;
4832 fusbh200
->next_frame
= now_frame
;
4834 /*-------------------------------------------------------------------------*/
4836 * Display / Set uframe_periodic_max
4838 static ssize_t
show_uframe_periodic_max(struct device
*dev
,
4839 struct device_attribute
*attr
,
4842 struct fusbh200_hcd
*fusbh200
;
4845 fusbh200
= hcd_to_fusbh200(bus_to_hcd(dev_get_drvdata(dev
)));
4846 n
= scnprintf(buf
, PAGE_SIZE
, "%d\n", fusbh200
->uframe_periodic_max
);
4851 static ssize_t
store_uframe_periodic_max(struct device
*dev
,
4852 struct device_attribute
*attr
,
4853 const char *buf
, size_t count
)
4855 struct fusbh200_hcd
*fusbh200
;
4856 unsigned uframe_periodic_max
;
4857 unsigned frame
, uframe
;
4858 unsigned short allocated_max
;
4859 unsigned long flags
;
4862 fusbh200
= hcd_to_fusbh200(bus_to_hcd(dev_get_drvdata(dev
)));
4863 if (kstrtouint(buf
, 0, &uframe_periodic_max
) < 0)
4866 if (uframe_periodic_max
< 100 || uframe_periodic_max
>= 125) {
4867 fusbh200_info(fusbh200
, "rejecting invalid request for "
4868 "uframe_periodic_max=%u\n", uframe_periodic_max
);
4875 * lock, so that our checking does not race with possible periodic
4876 * bandwidth allocation through submitting new urbs.
4878 spin_lock_irqsave (&fusbh200
->lock
, flags
);
4881 * for request to decrease max periodic bandwidth, we have to check
4882 * every microframe in the schedule to see whether the decrease is
4885 if (uframe_periodic_max
< fusbh200
->uframe_periodic_max
) {
4888 for (frame
= 0; frame
< fusbh200
->periodic_size
; ++frame
)
4889 for (uframe
= 0; uframe
< 7; ++uframe
)
4890 allocated_max
= max(allocated_max
,
4891 periodic_usecs (fusbh200
, frame
, uframe
));
4893 if (allocated_max
> uframe_periodic_max
) {
4894 fusbh200_info(fusbh200
,
4895 "cannot decrease uframe_periodic_max because "
4896 "periodic bandwidth is already allocated "
4898 allocated_max
, uframe_periodic_max
);
4903 /* increasing is always ok */
4905 fusbh200_info(fusbh200
, "setting max periodic bandwidth to %u%% "
4906 "(== %u usec/uframe)\n",
4907 100*uframe_periodic_max
/125, uframe_periodic_max
);
4909 if (uframe_periodic_max
!= 100)
4910 fusbh200_warn(fusbh200
, "max periodic bandwidth set is non-standard\n");
4912 fusbh200
->uframe_periodic_max
= uframe_periodic_max
;
4916 spin_unlock_irqrestore (&fusbh200
->lock
, flags
);
4919 static DEVICE_ATTR(uframe_periodic_max
, 0644, show_uframe_periodic_max
, store_uframe_periodic_max
);
4922 static inline int create_sysfs_files(struct fusbh200_hcd
*fusbh200
)
4924 struct device
*controller
= fusbh200_to_hcd(fusbh200
)->self
.controller
;
4930 i
= device_create_file(controller
, &dev_attr_uframe_periodic_max
);
4935 static inline void remove_sysfs_files(struct fusbh200_hcd
*fusbh200
)
4937 struct device
*controller
= fusbh200_to_hcd(fusbh200
)->self
.controller
;
4939 device_remove_file(controller
, &dev_attr_uframe_periodic_max
);
4941 /*-------------------------------------------------------------------------*/
4943 /* On some systems, leaving remote wakeup enabled prevents system shutdown.
4944 * The firmware seems to think that powering off is a wakeup event!
4945 * This routine turns off remote wakeup and everything else, on all ports.
4947 static void fusbh200_turn_off_all_ports(struct fusbh200_hcd
*fusbh200
)
4949 u32 __iomem
*status_reg
= &fusbh200
->regs
->port_status
;
4951 fusbh200_writel(fusbh200
, PORT_RWC_BITS
, status_reg
);
4955 * Halt HC, turn off all ports, and let the BIOS use the companion controllers.
4956 * Must be called with interrupts enabled and the lock not held.
4958 static void fusbh200_silence_controller(struct fusbh200_hcd
*fusbh200
)
4960 fusbh200_halt(fusbh200
);
4962 spin_lock_irq(&fusbh200
->lock
);
4963 fusbh200
->rh_state
= FUSBH200_RH_HALTED
;
4964 fusbh200_turn_off_all_ports(fusbh200
);
4965 spin_unlock_irq(&fusbh200
->lock
);
4968 /* fusbh200_shutdown kick in for silicon on any bus (not just pci, etc).
4969 * This forcibly disables dma and IRQs, helping kexec and other cases
4970 * where the next system software may expect clean state.
4972 static void fusbh200_shutdown(struct usb_hcd
*hcd
)
4974 struct fusbh200_hcd
*fusbh200
= hcd_to_fusbh200(hcd
);
4976 spin_lock_irq(&fusbh200
->lock
);
4977 fusbh200
->shutdown
= true;
4978 fusbh200
->rh_state
= FUSBH200_RH_STOPPING
;
4979 fusbh200
->enabled_hrtimer_events
= 0;
4980 spin_unlock_irq(&fusbh200
->lock
);
4982 fusbh200_silence_controller(fusbh200
);
4984 hrtimer_cancel(&fusbh200
->hrtimer
);
4987 /*-------------------------------------------------------------------------*/
4990 * fusbh200_work is called from some interrupts, timers, and so on.
4991 * it calls driver completion functions, after dropping fusbh200->lock.
4993 static void fusbh200_work (struct fusbh200_hcd
*fusbh200
)
4995 /* another CPU may drop fusbh200->lock during a schedule scan while
4996 * it reports urb completions. this flag guards against bogus
4997 * attempts at re-entrant schedule scanning.
4999 if (fusbh200
->scanning
) {
5000 fusbh200
->need_rescan
= true;
5003 fusbh200
->scanning
= true;
5006 fusbh200
->need_rescan
= false;
5007 if (fusbh200
->async_count
)
5008 scan_async(fusbh200
);
5009 if (fusbh200
->intr_count
> 0)
5010 scan_intr(fusbh200
);
5011 if (fusbh200
->isoc_count
> 0)
5012 scan_isoc(fusbh200
);
5013 if (fusbh200
->need_rescan
)
5015 fusbh200
->scanning
= false;
5017 /* the IO watchdog guards against hardware or driver bugs that
5018 * misplace IRQs, and should let us run completely without IRQs.
5019 * such lossage has been observed on both VT6202 and VT8235.
5021 turn_on_io_watchdog(fusbh200
);
5025 * Called when the fusbh200_hcd module is removed.
5027 static void fusbh200_stop (struct usb_hcd
*hcd
)
5029 struct fusbh200_hcd
*fusbh200
= hcd_to_fusbh200 (hcd
);
5031 fusbh200_dbg (fusbh200
, "stop\n");
5033 /* no more interrupts ... */
5035 spin_lock_irq(&fusbh200
->lock
);
5036 fusbh200
->enabled_hrtimer_events
= 0;
5037 spin_unlock_irq(&fusbh200
->lock
);
5039 fusbh200_quiesce(fusbh200
);
5040 fusbh200_silence_controller(fusbh200
);
5041 fusbh200_reset (fusbh200
);
5043 hrtimer_cancel(&fusbh200
->hrtimer
);
5044 remove_sysfs_files(fusbh200
);
5045 remove_debug_files (fusbh200
);
5047 /* root hub is shut down separately (first, when possible) */
5048 spin_lock_irq (&fusbh200
->lock
);
5049 end_free_itds(fusbh200
);
5050 spin_unlock_irq (&fusbh200
->lock
);
5051 fusbh200_mem_cleanup (fusbh200
);
5053 fusbh200_dbg(fusbh200
, "irq normal %ld err %ld iaa %ld (lost %ld)\n",
5054 fusbh200
->stats
.normal
, fusbh200
->stats
.error
, fusbh200
->stats
.iaa
,
5055 fusbh200
->stats
.lost_iaa
);
5056 fusbh200_dbg (fusbh200
, "complete %ld unlink %ld\n",
5057 fusbh200
->stats
.complete
, fusbh200
->stats
.unlink
);
5059 dbg_status (fusbh200
, "fusbh200_stop completed",
5060 fusbh200_readl(fusbh200
, &fusbh200
->regs
->status
));
5063 /* one-time init, only for memory state */
5064 static int hcd_fusbh200_init(struct usb_hcd
*hcd
)
5066 struct fusbh200_hcd
*fusbh200
= hcd_to_fusbh200(hcd
);
5070 struct fusbh200_qh_hw
*hw
;
5072 spin_lock_init(&fusbh200
->lock
);
5075 * keep io watchdog by default, those good HCDs could turn off it later
5077 fusbh200
->need_io_watchdog
= 1;
5079 hrtimer_init(&fusbh200
->hrtimer
, CLOCK_MONOTONIC
, HRTIMER_MODE_ABS
);
5080 fusbh200
->hrtimer
.function
= fusbh200_hrtimer_func
;
5081 fusbh200
->next_hrtimer_event
= FUSBH200_HRTIMER_NO_EVENT
;
5083 hcc_params
= fusbh200_readl(fusbh200
, &fusbh200
->caps
->hcc_params
);
5086 * by default set standard 80% (== 100 usec/uframe) max periodic
5087 * bandwidth as required by USB 2.0
5089 fusbh200
->uframe_periodic_max
= 100;
5092 * hw default: 1K periodic list heads, one per frame.
5093 * periodic_size can shrink by USBCMD update if hcc_params allows.
5095 fusbh200
->periodic_size
= DEFAULT_I_TDPS
;
5096 INIT_LIST_HEAD(&fusbh200
->intr_qh_list
);
5097 INIT_LIST_HEAD(&fusbh200
->cached_itd_list
);
5099 if (HCC_PGM_FRAMELISTLEN(hcc_params
)) {
5100 /* periodic schedule size can be smaller than default */
5101 switch (FUSBH200_TUNE_FLS
) {
5102 case 0: fusbh200
->periodic_size
= 1024; break;
5103 case 1: fusbh200
->periodic_size
= 512; break;
5104 case 2: fusbh200
->periodic_size
= 256; break;
5108 if ((retval
= fusbh200_mem_init(fusbh200
, GFP_KERNEL
)) < 0)
5111 /* controllers may cache some of the periodic schedule ... */
5112 fusbh200
->i_thresh
= 2;
5115 * dedicate a qh for the async ring head, since we couldn't unlink
5116 * a 'real' qh without stopping the async schedule [4.8]. use it
5117 * as the 'reclamation list head' too.
5118 * its dummy is used in hw_alt_next of many tds, to prevent the qh
5119 * from automatically advancing to the next td after short reads.
5121 fusbh200
->async
->qh_next
.qh
= NULL
;
5122 hw
= fusbh200
->async
->hw
;
5123 hw
->hw_next
= QH_NEXT(fusbh200
, fusbh200
->async
->qh_dma
);
5124 hw
->hw_info1
= cpu_to_hc32(fusbh200
, QH_HEAD
);
5125 hw
->hw_token
= cpu_to_hc32(fusbh200
, QTD_STS_HALT
);
5126 hw
->hw_qtd_next
= FUSBH200_LIST_END(fusbh200
);
5127 fusbh200
->async
->qh_state
= QH_STATE_LINKED
;
5128 hw
->hw_alt_next
= QTD_NEXT(fusbh200
, fusbh200
->async
->dummy
->qtd_dma
);
5130 /* clear interrupt enables, set irq latency */
5131 if (log2_irq_thresh
< 0 || log2_irq_thresh
> 6)
5132 log2_irq_thresh
= 0;
5133 temp
= 1 << (16 + log2_irq_thresh
);
5134 if (HCC_CANPARK(hcc_params
)) {
5135 /* HW default park == 3, on hardware that supports it (like
5136 * NVidia and ALI silicon), maximizes throughput on the async
5137 * schedule by avoiding QH fetches between transfers.
5139 * With fast usb storage devices and NForce2, "park" seems to
5140 * make problems: throughput reduction (!), data errors...
5143 park
= min(park
, (unsigned) 3);
5147 fusbh200_dbg(fusbh200
, "park %d\n", park
);
5149 if (HCC_PGM_FRAMELISTLEN(hcc_params
)) {
5150 /* periodic schedule size can be smaller than default */
5152 temp
|= (FUSBH200_TUNE_FLS
<< 2);
5154 fusbh200
->command
= temp
;
5156 /* Accept arbitrarily long scatter-gather lists */
5157 if (!(hcd
->driver
->flags
& HCD_LOCAL_MEM
))
5158 hcd
->self
.sg_tablesize
= ~0;
5162 /* start HC running; it's halted, hcd_fusbh200_init() has been run (once) */
5163 static int fusbh200_run (struct usb_hcd
*hcd
)
5165 struct fusbh200_hcd
*fusbh200
= hcd_to_fusbh200 (hcd
);
5169 hcd
->uses_new_polling
= 1;
5171 /* EHCI spec section 4.1 */
5173 fusbh200_writel(fusbh200
, fusbh200
->periodic_dma
, &fusbh200
->regs
->frame_list
);
5174 fusbh200_writel(fusbh200
, (u32
)fusbh200
->async
->qh_dma
, &fusbh200
->regs
->async_next
);
5177 * hcc_params controls whether fusbh200->regs->segment must (!!!)
5178 * be used; it constrains QH/ITD/SITD and QTD locations.
5179 * pci_pool consistent memory always uses segment zero.
5180 * streaming mappings for I/O buffers, like pci_map_single(),
5181 * can return segments above 4GB, if the device allows.
5183 * NOTE: the dma mask is visible through dma_supported(), so
5184 * drivers can pass this info along ... like NETIF_F_HIGHDMA,
5185 * Scsi_Host.highmem_io, and so forth. It's readonly to all
5186 * host side drivers though.
5188 hcc_params
= fusbh200_readl(fusbh200
, &fusbh200
->caps
->hcc_params
);
5190 // Philips, Intel, and maybe others need CMD_RUN before the
5191 // root hub will detect new devices (why?); NEC doesn't
5192 fusbh200
->command
&= ~(CMD_IAAD
|CMD_PSE
|CMD_ASE
|CMD_RESET
);
5193 fusbh200
->command
|= CMD_RUN
;
5194 fusbh200_writel(fusbh200
, fusbh200
->command
, &fusbh200
->regs
->command
);
5195 dbg_cmd (fusbh200
, "init", fusbh200
->command
);
5198 * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
5199 * are explicitly handed to companion controller(s), so no TT is
5200 * involved with the root hub. (Except where one is integrated,
5201 * and there's no companion controller unless maybe for USB OTG.)
5203 * Turning on the CF flag will transfer ownership of all ports
5204 * from the companions to the EHCI controller. If any of the
5205 * companions are in the middle of a port reset at the time, it
5206 * could cause trouble. Write-locking ehci_cf_port_reset_rwsem
5207 * guarantees that no resets are in progress. After we set CF,
5208 * a short delay lets the hardware catch up; new resets shouldn't
5209 * be started before the port switching actions could complete.
5211 down_write(&ehci_cf_port_reset_rwsem
);
5212 fusbh200
->rh_state
= FUSBH200_RH_RUNNING
;
5213 fusbh200_readl(fusbh200
, &fusbh200
->regs
->command
); /* unblock posted writes */
5215 up_write(&ehci_cf_port_reset_rwsem
);
5216 fusbh200
->last_periodic_enable
= ktime_get_real();
5218 temp
= HC_VERSION(fusbh200
, fusbh200_readl(fusbh200
, &fusbh200
->caps
->hc_capbase
));
5219 fusbh200_info (fusbh200
,
5220 "USB %x.%x started, EHCI %x.%02x\n",
5221 ((fusbh200
->sbrn
& 0xf0)>>4), (fusbh200
->sbrn
& 0x0f),
5222 temp
>> 8, temp
& 0xff);
5224 fusbh200_writel(fusbh200
, INTR_MASK
,
5225 &fusbh200
->regs
->intr_enable
); /* Turn On Interrupts */
5227 /* GRR this is run-once init(), being done every time the HC starts.
5228 * So long as they're part of class devices, we can't do it init()
5229 * since the class device isn't created that early.
5231 create_debug_files(fusbh200
);
5232 create_sysfs_files(fusbh200
);
5237 static int fusbh200_setup(struct usb_hcd
*hcd
)
5239 struct fusbh200_hcd
*fusbh200
= hcd_to_fusbh200(hcd
);
5242 fusbh200
->regs
= (void __iomem
*)fusbh200
->caps
+
5243 HC_LENGTH(fusbh200
, fusbh200_readl(fusbh200
, &fusbh200
->caps
->hc_capbase
));
5244 dbg_hcs_params(fusbh200
, "reset");
5245 dbg_hcc_params(fusbh200
, "reset");
5247 /* cache this readonly data; minimize chip reads */
5248 fusbh200
->hcs_params
= fusbh200_readl(fusbh200
, &fusbh200
->caps
->hcs_params
);
5250 fusbh200
->sbrn
= HCD_USB2
;
5252 /* data structure init */
5253 retval
= hcd_fusbh200_init(hcd
);
5257 retval
= fusbh200_halt(fusbh200
);
5261 fusbh200_reset(fusbh200
);
5266 /*-------------------------------------------------------------------------*/
5268 static irqreturn_t
fusbh200_irq (struct usb_hcd
*hcd
)
5270 struct fusbh200_hcd
*fusbh200
= hcd_to_fusbh200 (hcd
);
5271 u32 status
, masked_status
, pcd_status
= 0, cmd
;
5274 spin_lock (&fusbh200
->lock
);
5276 status
= fusbh200_readl(fusbh200
, &fusbh200
->regs
->status
);
5278 /* e.g. cardbus physical eject */
5279 if (status
== ~(u32
) 0) {
5280 fusbh200_dbg (fusbh200
, "device removed\n");
5285 * We don't use STS_FLR, but some controllers don't like it to
5286 * remain on, so mask it out along with the other status bits.
5288 masked_status
= status
& (INTR_MASK
| STS_FLR
);
5291 if (!masked_status
|| unlikely(fusbh200
->rh_state
== FUSBH200_RH_HALTED
)) {
5292 spin_unlock(&fusbh200
->lock
);
5296 /* clear (just) interrupts */
5297 fusbh200_writel(fusbh200
, masked_status
, &fusbh200
->regs
->status
);
5298 cmd
= fusbh200_readl(fusbh200
, &fusbh200
->regs
->command
);
5301 /* normal [4.15.1.2] or error [4.15.1.1] completion */
5302 if (likely ((status
& (STS_INT
|STS_ERR
)) != 0)) {
5303 if (likely ((status
& STS_ERR
) == 0))
5304 COUNT (fusbh200
->stats
.normal
);
5306 COUNT (fusbh200
->stats
.error
);
5310 /* complete the unlinking of some qh [4.15.2.3] */
5311 if (status
& STS_IAA
) {
5313 /* Turn off the IAA watchdog */
5314 fusbh200
->enabled_hrtimer_events
&= ~BIT(FUSBH200_HRTIMER_IAA_WATCHDOG
);
5317 * Mild optimization: Allow another IAAD to reset the
5318 * hrtimer, if one occurs before the next expiration.
5319 * In theory we could always cancel the hrtimer, but
5320 * tests show that about half the time it will be reset
5321 * for some other event anyway.
5323 if (fusbh200
->next_hrtimer_event
== FUSBH200_HRTIMER_IAA_WATCHDOG
)
5324 ++fusbh200
->next_hrtimer_event
;
5326 /* guard against (alleged) silicon errata */
5328 fusbh200_dbg(fusbh200
, "IAA with IAAD still set?\n");
5329 if (fusbh200
->async_iaa
) {
5330 COUNT(fusbh200
->stats
.iaa
);
5331 end_unlink_async(fusbh200
);
5333 fusbh200_dbg(fusbh200
, "IAA with nothing unlinked?\n");
5336 /* remote wakeup [4.3.1] */
5337 if (status
& STS_PCD
) {
5339 u32 __iomem
*status_reg
= &fusbh200
->regs
->port_status
;
5341 /* kick root hub later */
5342 pcd_status
= status
;
5344 /* resume root hub? */
5345 if (fusbh200
->rh_state
== FUSBH200_RH_SUSPENDED
)
5346 usb_hcd_resume_root_hub(hcd
);
5348 pstatus
= fusbh200_readl(fusbh200
, status_reg
);
5350 if (test_bit(0, &fusbh200
->suspended_ports
) &&
5351 ((pstatus
& PORT_RESUME
) ||
5352 !(pstatus
& PORT_SUSPEND
)) &&
5353 (pstatus
& PORT_PE
) &&
5354 fusbh200
->reset_done
[0] == 0) {
5356 /* start 20 msec resume signaling from this port,
5357 * and make hub_wq collect PORT_STAT_C_SUSPEND to
5358 * stop that signaling. Use 5 ms extra for safety,
5359 * like usb_port_resume() does.
5361 fusbh200
->reset_done
[0] = jiffies
+ msecs_to_jiffies(25);
5362 set_bit(0, &fusbh200
->resuming_ports
);
5363 fusbh200_dbg (fusbh200
, "port 1 remote wakeup\n");
5364 mod_timer(&hcd
->rh_timer
, fusbh200
->reset_done
[0]);
5368 /* PCI errors [4.15.2.4] */
5369 if (unlikely ((status
& STS_FATAL
) != 0)) {
5370 fusbh200_err(fusbh200
, "fatal error\n");
5371 dbg_cmd(fusbh200
, "fatal", cmd
);
5372 dbg_status(fusbh200
, "fatal", status
);
5376 /* Don't let the controller do anything more */
5377 fusbh200
->shutdown
= true;
5378 fusbh200
->rh_state
= FUSBH200_RH_STOPPING
;
5379 fusbh200
->command
&= ~(CMD_RUN
| CMD_ASE
| CMD_PSE
);
5380 fusbh200_writel(fusbh200
, fusbh200
->command
, &fusbh200
->regs
->command
);
5381 fusbh200_writel(fusbh200
, 0, &fusbh200
->regs
->intr_enable
);
5382 fusbh200_handle_controller_death(fusbh200
);
5384 /* Handle completions when the controller stops */
5389 fusbh200_work (fusbh200
);
5390 spin_unlock (&fusbh200
->lock
);
5392 usb_hcd_poll_rh_status(hcd
);
5396 /*-------------------------------------------------------------------------*/
5399 * non-error returns are a promise to giveback() the urb later
5400 * we drop ownership so next owner (or urb unlink) can get it
5402 * urb + dev is in hcd.self.controller.urb_list
5403 * we're queueing TDs onto software and hardware lists
5405 * hcd-specific init for hcpriv hasn't been done yet
5407 * NOTE: control, bulk, and interrupt share the same code to append TDs
5408 * to a (possibly active) QH, and the same QH scanning code.
5410 static int fusbh200_urb_enqueue (
5411 struct usb_hcd
*hcd
,
5415 struct fusbh200_hcd
*fusbh200
= hcd_to_fusbh200 (hcd
);
5416 struct list_head qtd_list
;
5418 INIT_LIST_HEAD (&qtd_list
);
5420 switch (usb_pipetype (urb
->pipe
)) {
5422 /* qh_completions() code doesn't handle all the fault cases
5423 * in multi-TD control transfers. Even 1KB is rare anyway.
5425 if (urb
->transfer_buffer_length
> (16 * 1024))
5428 /* case PIPE_BULK: */
5430 if (!qh_urb_transaction (fusbh200
, urb
, &qtd_list
, mem_flags
))
5432 return submit_async(fusbh200
, urb
, &qtd_list
, mem_flags
);
5434 case PIPE_INTERRUPT
:
5435 if (!qh_urb_transaction (fusbh200
, urb
, &qtd_list
, mem_flags
))
5437 return intr_submit(fusbh200
, urb
, &qtd_list
, mem_flags
);
5439 case PIPE_ISOCHRONOUS
:
5440 return itd_submit (fusbh200
, urb
, mem_flags
);
5444 /* remove from hardware lists
5445 * completions normally happen asynchronously
5448 static int fusbh200_urb_dequeue(struct usb_hcd
*hcd
, struct urb
*urb
, int status
)
5450 struct fusbh200_hcd
*fusbh200
= hcd_to_fusbh200 (hcd
);
5451 struct fusbh200_qh
*qh
;
5452 unsigned long flags
;
5455 spin_lock_irqsave (&fusbh200
->lock
, flags
);
5456 rc
= usb_hcd_check_unlink_urb(hcd
, urb
, status
);
5460 switch (usb_pipetype (urb
->pipe
)) {
5461 // case PIPE_CONTROL:
5464 qh
= (struct fusbh200_qh
*) urb
->hcpriv
;
5467 switch (qh
->qh_state
) {
5468 case QH_STATE_LINKED
:
5469 case QH_STATE_COMPLETING
:
5470 start_unlink_async(fusbh200
, qh
);
5472 case QH_STATE_UNLINK
:
5473 case QH_STATE_UNLINK_WAIT
:
5474 /* already started */
5477 /* QH might be waiting for a Clear-TT-Buffer */
5478 qh_completions(fusbh200
, qh
);
5483 case PIPE_INTERRUPT
:
5484 qh
= (struct fusbh200_qh
*) urb
->hcpriv
;
5487 switch (qh
->qh_state
) {
5488 case QH_STATE_LINKED
:
5489 case QH_STATE_COMPLETING
:
5490 start_unlink_intr(fusbh200
, qh
);
5493 qh_completions (fusbh200
, qh
);
5496 fusbh200_dbg (fusbh200
, "bogus qh %p state %d\n",
5502 case PIPE_ISOCHRONOUS
:
5505 // wait till next completion, do it then.
5506 // completion irqs can wait up to 1024 msec,
5510 spin_unlock_irqrestore (&fusbh200
->lock
, flags
);
5514 /*-------------------------------------------------------------------------*/
5516 // bulk qh holds the data toggle
5519 fusbh200_endpoint_disable (struct usb_hcd
*hcd
, struct usb_host_endpoint
*ep
)
5521 struct fusbh200_hcd
*fusbh200
= hcd_to_fusbh200 (hcd
);
5522 unsigned long flags
;
5523 struct fusbh200_qh
*qh
, *tmp
;
5525 /* ASSERT: any requests/urbs are being unlinked */
5526 /* ASSERT: nobody can be submitting urbs for this any more */
5529 spin_lock_irqsave (&fusbh200
->lock
, flags
);
5534 /* endpoints can be iso streams. for now, we don't
5535 * accelerate iso completions ... so spin a while.
5537 if (qh
->hw
== NULL
) {
5538 struct fusbh200_iso_stream
*stream
= ep
->hcpriv
;
5540 if (!list_empty(&stream
->td_list
))
5543 /* BUG_ON(!list_empty(&stream->free_list)); */
5548 if (fusbh200
->rh_state
< FUSBH200_RH_RUNNING
)
5549 qh
->qh_state
= QH_STATE_IDLE
;
5550 switch (qh
->qh_state
) {
5551 case QH_STATE_LINKED
:
5552 case QH_STATE_COMPLETING
:
5553 for (tmp
= fusbh200
->async
->qh_next
.qh
;
5555 tmp
= tmp
->qh_next
.qh
)
5557 /* periodic qh self-unlinks on empty, and a COMPLETING qh
5558 * may already be unlinked.
5561 start_unlink_async(fusbh200
, qh
);
5563 case QH_STATE_UNLINK
: /* wait for hw to finish? */
5564 case QH_STATE_UNLINK_WAIT
:
5566 spin_unlock_irqrestore (&fusbh200
->lock
, flags
);
5567 schedule_timeout_uninterruptible(1);
5569 case QH_STATE_IDLE
: /* fully unlinked */
5570 if (qh
->clearing_tt
)
5572 if (list_empty (&qh
->qtd_list
)) {
5573 qh_destroy(fusbh200
, qh
);
5576 /* else FALL THROUGH */
5578 /* caller was supposed to have unlinked any requests;
5579 * that's not our job. just leak this memory.
5581 fusbh200_err (fusbh200
, "qh %p (#%02x) state %d%s\n",
5582 qh
, ep
->desc
.bEndpointAddress
, qh
->qh_state
,
5583 list_empty (&qh
->qtd_list
) ? "" : "(has tds)");
5588 spin_unlock_irqrestore (&fusbh200
->lock
, flags
);
5592 fusbh200_endpoint_reset(struct usb_hcd
*hcd
, struct usb_host_endpoint
*ep
)
5594 struct fusbh200_hcd
*fusbh200
= hcd_to_fusbh200(hcd
);
5595 struct fusbh200_qh
*qh
;
5596 int eptype
= usb_endpoint_type(&ep
->desc
);
5597 int epnum
= usb_endpoint_num(&ep
->desc
);
5598 int is_out
= usb_endpoint_dir_out(&ep
->desc
);
5599 unsigned long flags
;
5601 if (eptype
!= USB_ENDPOINT_XFER_BULK
&& eptype
!= USB_ENDPOINT_XFER_INT
)
5604 spin_lock_irqsave(&fusbh200
->lock
, flags
);
5607 /* For Bulk and Interrupt endpoints we maintain the toggle state
5608 * in the hardware; the toggle bits in udev aren't used at all.
5609 * When an endpoint is reset by usb_clear_halt() we must reset
5610 * the toggle bit in the QH.
5613 usb_settoggle(qh
->dev
, epnum
, is_out
, 0);
5614 if (!list_empty(&qh
->qtd_list
)) {
5615 WARN_ONCE(1, "clear_halt for a busy endpoint\n");
5616 } else if (qh
->qh_state
== QH_STATE_LINKED
||
5617 qh
->qh_state
== QH_STATE_COMPLETING
) {
5619 /* The toggle value in the QH can't be updated
5620 * while the QH is active. Unlink it now;
5621 * re-linking will call qh_refresh().
5623 if (eptype
== USB_ENDPOINT_XFER_BULK
)
5624 start_unlink_async(fusbh200
, qh
);
5626 start_unlink_intr(fusbh200
, qh
);
5629 spin_unlock_irqrestore(&fusbh200
->lock
, flags
);
5632 static int fusbh200_get_frame (struct usb_hcd
*hcd
)
5634 struct fusbh200_hcd
*fusbh200
= hcd_to_fusbh200 (hcd
);
5635 return (fusbh200_read_frame_index(fusbh200
) >> 3) % fusbh200
->periodic_size
;
5638 /*-------------------------------------------------------------------------*/
5641 * The EHCI in ChipIdea HDRC cannot be a separate module or device,
5642 * because its registers (and irq) are shared between host/gadget/otg
5643 * functions and in order to facilitate role switching we cannot
5644 * give the fusbh200 driver exclusive access to those.
5646 MODULE_DESCRIPTION(DRIVER_DESC
);
5647 MODULE_AUTHOR (DRIVER_AUTHOR
);
5648 MODULE_LICENSE ("GPL");
5650 static const struct hc_driver fusbh200_fusbh200_hc_driver
= {
5651 .description
= hcd_name
,
5652 .product_desc
= "Faraday USB2.0 Host Controller",
5653 .hcd_priv_size
= sizeof(struct fusbh200_hcd
),
5656 * generic hardware linkage
5658 .irq
= fusbh200_irq
,
5659 .flags
= HCD_MEMORY
| HCD_USB2
,
5662 * basic lifecycle operations
5664 .reset
= hcd_fusbh200_init
,
5665 .start
= fusbh200_run
,
5666 .stop
= fusbh200_stop
,
5667 .shutdown
= fusbh200_shutdown
,
5670 * managing i/o requests and associated device resources
5672 .urb_enqueue
= fusbh200_urb_enqueue
,
5673 .urb_dequeue
= fusbh200_urb_dequeue
,
5674 .endpoint_disable
= fusbh200_endpoint_disable
,
5675 .endpoint_reset
= fusbh200_endpoint_reset
,
5678 * scheduling support
5680 .get_frame_number
= fusbh200_get_frame
,
5685 .hub_status_data
= fusbh200_hub_status_data
,
5686 .hub_control
= fusbh200_hub_control
,
5687 .bus_suspend
= fusbh200_bus_suspend
,
5688 .bus_resume
= fusbh200_bus_resume
,
5690 .relinquish_port
= fusbh200_relinquish_port
,
5691 .port_handed_over
= fusbh200_port_handed_over
,
5693 .clear_tt_buffer_complete
= fusbh200_clear_tt_buffer_complete
,
5696 static void fusbh200_init(struct fusbh200_hcd
*fusbh200
)
5700 reg
= fusbh200_readl(fusbh200
, &fusbh200
->regs
->bmcsr
);
5701 reg
|= BMCSR_INT_POLARITY
;
5702 reg
&= ~BMCSR_VBUS_OFF
;
5703 fusbh200_writel(fusbh200
, reg
, &fusbh200
->regs
->bmcsr
);
5705 reg
= fusbh200_readl(fusbh200
, &fusbh200
->regs
->bmier
);
5706 fusbh200_writel(fusbh200
, reg
| BMIER_OVC_EN
| BMIER_VBUS_ERR_EN
,
5707 &fusbh200
->regs
->bmier
);
5711 * fusbh200_hcd_probe - initialize faraday FUSBH200 HCDs
5713 * Allocates basic resources for this USB host controller, and
5714 * then invokes the start() method for the HCD associated with it
5715 * through the hotplug entry's driver_data.
5717 static int fusbh200_hcd_probe(struct platform_device
*pdev
)
5719 struct device
*dev
= &pdev
->dev
;
5720 struct usb_hcd
*hcd
;
5721 struct resource
*res
;
5723 int retval
= -ENODEV
;
5724 struct fusbh200_hcd
*fusbh200
;
5729 pdev
->dev
.power
.power_state
= PMSG_ON
;
5731 res
= platform_get_resource(pdev
, IORESOURCE_IRQ
, 0);
5734 "Found HC with no IRQ. Check %s setup!\n",
5741 hcd
= usb_create_hcd(&fusbh200_fusbh200_hc_driver
, dev
,
5744 dev_err(dev
, "failed to create hcd with err %d\n", retval
);
5746 goto fail_create_hcd
;
5749 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
5752 "Found HC with no register addr. Check %s setup!\n",
5755 goto fail_request_resource
;
5758 hcd
->rsrc_start
= res
->start
;
5759 hcd
->rsrc_len
= resource_size(res
);
5762 if (!request_mem_region(hcd
->rsrc_start
, hcd
->rsrc_len
,
5763 fusbh200_fusbh200_hc_driver
.description
)) {
5764 dev_dbg(dev
, "controller already in use\n");
5766 goto fail_request_resource
;
5769 res
= platform_get_resource(pdev
, IORESOURCE_IO
, 0);
5772 "Found HC with no register addr. Check %s setup!\n",
5775 goto fail_request_resource
;
5778 hcd
->regs
= ioremap_nocache(res
->start
, resource_size(res
));
5779 if (hcd
->regs
== NULL
) {
5780 dev_dbg(dev
, "error mapping memory\n");
5785 fusbh200
= hcd_to_fusbh200(hcd
);
5787 fusbh200
->caps
= hcd
->regs
;
5789 retval
= fusbh200_setup(hcd
);
5793 fusbh200_init(fusbh200
);
5795 retval
= usb_add_hcd(hcd
, irq
, IRQF_SHARED
);
5797 dev_err(dev
, "failed to add hcd with err %d\n", retval
);
5800 device_wakeup_enable(hcd
->self
.controller
);
5807 release_mem_region(hcd
->rsrc_start
, hcd
->rsrc_len
);
5808 fail_request_resource
:
5811 dev_err(dev
, "init %s fail, %d\n", dev_name(dev
), retval
);
5816 * fusbh200_hcd_remove - shutdown processing for EHCI HCDs
5817 * @dev: USB Host Controller being removed
5819 * Reverses the effect of fotg2xx_usb_hcd_probe(), first invoking
5820 * the HCD's stop() method. It is always called from a thread
5821 * context, normally "rmmod", "apmd", or something similar.
5823 static int fusbh200_hcd_remove(struct platform_device
*pdev
)
5825 struct device
*dev
= &pdev
->dev
;
5826 struct usb_hcd
*hcd
= dev_get_drvdata(dev
);
5831 usb_remove_hcd(hcd
);
5833 release_mem_region(hcd
->rsrc_start
, hcd
->rsrc_len
);
5839 static struct platform_driver fusbh200_hcd_fusbh200_driver
= {
5843 .probe
= fusbh200_hcd_probe
,
5844 .remove
= fusbh200_hcd_remove
,
5847 static int __init
fusbh200_hcd_init(void)
5854 printk(KERN_INFO
"%s: " DRIVER_DESC
"\n", hcd_name
);
5855 set_bit(USB_EHCI_LOADED
, &usb_hcds_loaded
);
5856 if (test_bit(USB_UHCI_LOADED
, &usb_hcds_loaded
) ||
5857 test_bit(USB_OHCI_LOADED
, &usb_hcds_loaded
))
5858 printk(KERN_WARNING
"Warning! fusbh200_hcd should always be loaded"
5859 " before uhci_hcd and ohci_hcd, not after\n");
5861 pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd\n",
5863 sizeof(struct fusbh200_qh
), sizeof(struct fusbh200_qtd
),
5864 sizeof(struct fusbh200_itd
));
5866 fusbh200_debug_root
= debugfs_create_dir("fusbh200", usb_debug_root
);
5867 if (!fusbh200_debug_root
) {
5872 retval
= platform_driver_register(&fusbh200_hcd_fusbh200_driver
);
5877 platform_driver_unregister(&fusbh200_hcd_fusbh200_driver
);
5879 debugfs_remove(fusbh200_debug_root
);
5880 fusbh200_debug_root
= NULL
;
5882 clear_bit(USB_EHCI_LOADED
, &usb_hcds_loaded
);
5885 module_init(fusbh200_hcd_init
);
5887 static void __exit
fusbh200_hcd_cleanup(void)
5889 platform_driver_unregister(&fusbh200_hcd_fusbh200_driver
);
5890 debugfs_remove(fusbh200_debug_root
);
5891 clear_bit(USB_EHCI_LOADED
, &usb_hcds_loaded
);
5893 module_exit(fusbh200_hcd_cleanup
);