2 * esp.c - driver for Hayes ESP serial cards
4 * --- Notices from serial.c, upon which this driver is based ---
6 * Copyright (C) 1991, 1992 Linus Torvalds
8 * Extensively rewritten by Theodore Ts'o, 8/16/92 -- 9/14/92. Now
9 * much more extensible to support other serial cards based on the
10 * 16450/16550A UART's. Added support for the AST FourPort and the
13 * set_serial_info fixed to set the flags, custom divisor, and uart
14 * type fields. Fix suggested by Michael K. Johnson 12/12/92.
16 * 11/95: TIOCMIWAIT, TIOCGICOUNT by Angelo Haritsis <ah@doc.ic.ac.uk>
18 * 03/96: Modularised by Angelo Haritsis <ah@doc.ic.ac.uk>
20 * rs_set_termios fixed to look also for changes of the input
21 * flags INPCK, BRKINT, PARMRK, IGNPAR and IGNBRK.
22 * Bernd Anhäupl 05/17/96.
24 * --- End of notices from serial.c ---
26 * Support for the ESP serial card by Andrew J. Robinson
27 * <arobinso@nyx.net> (Card detection routine taken from a patch
28 * by Dennis J. Boylan). Patches to allow use with 2.1.x contributed
31 * Most recent changes: (Andrew J. Robinson)
32 * Support for PIO mode. This allows the driver to work properly with
35 * Arnaldo Carvalho de Melo <acme@conectiva.com.br> -
36 * several cleanups, use module_init/module_exit, etc
38 * This module exports the following rs232 io functions:
40 * int espserial_init(void);
43 #include <linux/module.h>
44 #include <linux/errno.h>
45 #include <linux/signal.h>
46 #include <linux/sched.h>
47 #include <linux/interrupt.h>
48 #include <linux/tty.h>
49 #include <linux/tty_flip.h>
50 #include <linux/serial.h>
51 #include <linux/serialP.h>
52 #include <linux/serial_reg.h>
53 #include <linux/major.h>
54 #include <linux/string.h>
55 #include <linux/fcntl.h>
56 #include <linux/ptrace.h>
57 #include <linux/ioport.h>
59 #include <linux/init.h>
60 #include <linux/delay.h>
61 #include <linux/bitops.h>
63 #include <asm/system.h>
67 #include <linux/slab.h>
68 #include <asm/uaccess.h>
70 #include <linux/hayesesp.h>
72 #define NR_PORTS 64 /* maximum number of ports */
73 #define NR_PRIMARY 8 /* maximum number of primary ports */
74 #define REGION_SIZE 8 /* size of io region to request */
76 /* The following variables can be set by giving module options */
77 static int irq
[NR_PRIMARY
]; /* IRQ for each base port */
78 static unsigned int divisor
[NR_PRIMARY
]; /* custom divisor for each port */
79 static unsigned int dma
= ESP_DMA_CHANNEL
; /* DMA channel */
80 static unsigned int rx_trigger
= ESP_RX_TRIGGER
;
81 static unsigned int tx_trigger
= ESP_TX_TRIGGER
;
82 static unsigned int flow_off
= ESP_FLOW_OFF
;
83 static unsigned int flow_on
= ESP_FLOW_ON
;
84 static unsigned int rx_timeout
= ESP_RX_TMOUT
;
85 static unsigned int pio_threshold
= ESP_PIO_THRESHOLD
;
87 MODULE_LICENSE("GPL");
89 module_param_array(irq
, int, NULL
, 0);
90 module_param_array(divisor
, uint
, NULL
, 0);
91 module_param(dma
, uint
, 0);
92 module_param(rx_trigger
, uint
, 0);
93 module_param(tx_trigger
, uint
, 0);
94 module_param(flow_off
, uint
, 0);
95 module_param(flow_on
, uint
, 0);
96 module_param(rx_timeout
, uint
, 0);
97 module_param(pio_threshold
, uint
, 0);
101 static char *dma_buffer
;
102 static int dma_bytes
;
103 static struct esp_pio_buffer
*free_pio_buf
;
105 #define DMA_BUFFER_SZ 1024
107 #define WAKEUP_CHARS 1024
109 static char serial_name
[] __initdata
= "ESP serial driver";
110 static char serial_version
[] __initdata
= "2.2";
112 static struct tty_driver
*esp_driver
;
115 * Serial driver configuration section. Here are the various options:
117 * SERIAL_PARANOIA_CHECK
118 * Check the magic number for the esp_structure where
122 #undef SERIAL_PARANOIA_CHECK
123 #define SERIAL_DO_RESTART
125 #undef SERIAL_DEBUG_INTR
126 #undef SERIAL_DEBUG_OPEN
127 #undef SERIAL_DEBUG_FLOW
129 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
130 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
131 tty->name, (info->flags), serial_driver.refcount,info->count,tty->count,s)
136 static struct esp_struct
*ports
;
138 static void change_speed(struct esp_struct
*info
);
139 static void rs_wait_until_sent(struct tty_struct
*, int);
142 * The ESP card has a clock rate of 14.7456 MHz (that is, 2**ESPC_SCALE
143 * times the normal 1.8432 Mhz clock of most serial boards).
145 #define BASE_BAUD ((1843200 / 16) * (1 << ESPC_SCALE))
147 /* Standard COM flags (except for COM4, because of the 8514 problem) */
148 #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
150 static inline int serial_paranoia_check(struct esp_struct
*info
,
151 char *name
, const char *routine
)
153 #ifdef SERIAL_PARANOIA_CHECK
154 static const char badmagic
[] = KERN_WARNING
155 "Warning: bad magic number for serial struct (%s) in %s\n";
156 static const char badinfo
[] = KERN_WARNING
157 "Warning: null esp_struct for (%s) in %s\n";
160 printk(badinfo
, name
, routine
);
163 if (info
->magic
!= ESP_MAGIC
) {
164 printk(badmagic
, name
, routine
);
171 static inline unsigned int serial_in(struct esp_struct
*info
, int offset
)
173 return inb(info
->port
+ offset
);
176 static inline void serial_out(struct esp_struct
*info
, int offset
,
179 outb(value
, info
->port
+offset
);
183 * ------------------------------------------------------------
184 * rs_stop() and rs_start()
186 * This routines are called before setting or resetting tty->stopped.
187 * They enable or disable transmitter interrupts, as necessary.
188 * ------------------------------------------------------------
190 static void rs_stop(struct tty_struct
*tty
)
192 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
195 if (serial_paranoia_check(info
, tty
->name
, "rs_stop"))
198 spin_lock_irqsave(&info
->lock
, flags
);
199 if (info
->IER
& UART_IER_THRI
) {
200 info
->IER
&= ~UART_IER_THRI
;
201 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
202 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
204 spin_unlock_irqrestore(&info
->lock
, flags
);
207 static void rs_start(struct tty_struct
*tty
)
209 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
212 if (serial_paranoia_check(info
, tty
->name
, "rs_start"))
215 spin_lock_irqsave(&info
->lock
, flags
);
216 if (info
->xmit_cnt
&& info
->xmit_buf
&& !(info
->IER
& UART_IER_THRI
)) {
217 info
->IER
|= UART_IER_THRI
;
218 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
219 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
221 spin_unlock_irqrestore(&info
->lock
, flags
);
225 * ----------------------------------------------------------------------
227 * Here starts the interrupt handling routines. All of the following
228 * subroutines are declared as inline and are folded into
229 * rs_interrupt(). They were separated out for readability's sake.
231 * Note: rs_interrupt() is a "fast" interrupt, which means that it
232 * runs with interrupts turned off. People who may want to modify
233 * rs_interrupt() should try to keep the interrupt handler as fast as
234 * possible. After you are done making modifications, it is not a bad
237 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
239 * and look at the resulting assemble code in serial.s.
241 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
242 * -----------------------------------------------------------------------
245 static DEFINE_SPINLOCK(pio_lock
);
247 static inline struct esp_pio_buffer
*get_pio_buffer(void)
249 struct esp_pio_buffer
*buf
;
252 spin_lock_irqsave(&pio_lock
, flags
);
255 free_pio_buf
= buf
->next
;
257 buf
= kmalloc(sizeof(struct esp_pio_buffer
), GFP_ATOMIC
);
259 spin_unlock_irqrestore(&pio_lock
, flags
);
263 static inline void release_pio_buffer(struct esp_pio_buffer
*buf
)
266 spin_lock_irqsave(&pio_lock
, flags
);
267 buf
->next
= free_pio_buf
;
269 spin_unlock_irqrestore(&pio_lock
, flags
);
272 static inline void receive_chars_pio(struct esp_struct
*info
, int num_bytes
)
274 struct tty_struct
*tty
= info
->tty
;
276 struct esp_pio_buffer
*pio_buf
;
277 struct esp_pio_buffer
*err_buf
;
278 unsigned char status_mask
;
280 pio_buf
= get_pio_buffer();
285 err_buf
= get_pio_buffer();
288 release_pio_buffer(pio_buf
);
292 status_mask
= (info
->read_status_mask
>> 2) & 0x07;
294 for (i
= 0; i
< num_bytes
- 1; i
+= 2) {
295 *((unsigned short *)(pio_buf
->data
+ i
)) =
296 inw(info
->port
+ UART_ESI_RX
);
297 err_buf
->data
[i
] = serial_in(info
, UART_ESI_RWS
);
298 err_buf
->data
[i
+ 1] = (err_buf
->data
[i
] >> 3) & status_mask
;
299 err_buf
->data
[i
] &= status_mask
;
302 if (num_bytes
& 0x0001) {
303 pio_buf
->data
[num_bytes
- 1] = serial_in(info
, UART_ESI_RX
);
304 err_buf
->data
[num_bytes
- 1] =
305 (serial_in(info
, UART_ESI_RWS
) >> 3) & status_mask
;
308 /* make sure everything is still ok since interrupts were enabled */
312 release_pio_buffer(pio_buf
);
313 release_pio_buffer(err_buf
);
314 info
->stat_flags
&= ~ESP_STAT_RX_TIMEOUT
;
318 status_mask
= (info
->ignore_status_mask
>> 2) & 0x07;
320 for (i
= 0; i
< num_bytes
; i
++) {
321 if (!(err_buf
->data
[i
] & status_mask
)) {
324 if (err_buf
->data
[i
] & 0x04) {
326 if (info
->flags
& ASYNC_SAK
)
329 else if (err_buf
->data
[i
] & 0x02)
331 else if (err_buf
->data
[i
] & 0x01)
333 tty_insert_flip_char(tty
, pio_buf
->data
[i
], flag
);
337 tty_schedule_flip(tty
);
339 info
->stat_flags
&= ~ESP_STAT_RX_TIMEOUT
;
340 release_pio_buffer(pio_buf
);
341 release_pio_buffer(err_buf
);
344 static inline void receive_chars_dma(struct esp_struct
*info
, int num_bytes
)
347 info
->stat_flags
&= ~ESP_STAT_RX_TIMEOUT
;
348 dma_bytes
= num_bytes
;
349 info
->stat_flags
|= ESP_STAT_DMA_RX
;
351 flags
=claim_dma_lock();
354 set_dma_mode(dma
, DMA_MODE_READ
);
355 set_dma_addr(dma
, isa_virt_to_bus(dma_buffer
));
356 set_dma_count(dma
, dma_bytes
);
358 release_dma_lock(flags
);
360 serial_out(info
, UART_ESI_CMD1
, ESI_START_DMA_RX
);
363 static inline void receive_chars_dma_done(struct esp_struct
*info
,
366 struct tty_struct
*tty
= info
->tty
;
370 flags
=claim_dma_lock();
374 info
->stat_flags
&= ~ESP_STAT_DMA_RX
;
375 num_bytes
= dma_bytes
- get_dma_residue(dma
);
376 release_dma_lock(flags
);
378 info
->icount
.rx
+= num_bytes
;
381 tty_insert_flip_string(tty
, dma_buffer
, num_bytes
- 1);
383 status
&= (0x1c & info
->read_status_mask
);
385 /* Is the status significant or do we throw the last byte ? */
386 if (!(status
& info
->ignore_status_mask
)) {
390 statflag
= TTY_BREAK
;
391 (info
->icount
.brk
)++;
392 if (info
->flags
& ASYNC_SAK
)
394 } else if (status
& 0x08) {
395 statflag
= TTY_FRAME
;
396 (info
->icount
.frame
)++;
398 else if (status
& 0x04) {
399 statflag
= TTY_PARITY
;
400 (info
->icount
.parity
)++;
402 tty_insert_flip_char(tty
, dma_buffer
[num_bytes
- 1], statflag
);
404 tty_schedule_flip(tty
);
407 if (dma_bytes
!= num_bytes
) {
408 num_bytes
= dma_bytes
- num_bytes
;
410 receive_chars_dma(info
, num_bytes
);
415 /* Caller must hold info->lock */
417 static inline void transmit_chars_pio(struct esp_struct
*info
,
421 struct esp_pio_buffer
*pio_buf
;
423 pio_buf
= get_pio_buffer();
428 while (space_avail
&& info
->xmit_cnt
) {
429 if (info
->xmit_tail
+ space_avail
<= ESP_XMIT_SIZE
) {
430 memcpy(pio_buf
->data
,
431 &(info
->xmit_buf
[info
->xmit_tail
]),
434 i
= ESP_XMIT_SIZE
- info
->xmit_tail
;
435 memcpy(pio_buf
->data
,
436 &(info
->xmit_buf
[info
->xmit_tail
]), i
);
437 memcpy(&(pio_buf
->data
[i
]), info
->xmit_buf
,
441 info
->xmit_cnt
-= space_avail
;
442 info
->xmit_tail
= (info
->xmit_tail
+ space_avail
) &
445 for (i
= 0; i
< space_avail
- 1; i
+= 2) {
446 outw(*((unsigned short *)(pio_buf
->data
+ i
)),
447 info
->port
+ UART_ESI_TX
);
450 if (space_avail
& 0x0001)
451 serial_out(info
, UART_ESI_TX
,
452 pio_buf
->data
[space_avail
- 1]);
454 if (info
->xmit_cnt
) {
455 serial_out(info
, UART_ESI_CMD1
, ESI_NO_COMMAND
);
456 serial_out(info
, UART_ESI_CMD1
, ESI_GET_TX_AVAIL
);
457 space_avail
= serial_in(info
, UART_ESI_STAT1
) << 8;
458 space_avail
|= serial_in(info
, UART_ESI_STAT2
);
460 if (space_avail
> info
->xmit_cnt
)
461 space_avail
= info
->xmit_cnt
;
465 if (info
->xmit_cnt
< WAKEUP_CHARS
) {
467 tty_wakeup(info
->tty
);
469 #ifdef SERIAL_DEBUG_INTR
473 if (info
->xmit_cnt
<= 0) {
474 info
->IER
&= ~UART_IER_THRI
;
475 serial_out(info
, UART_ESI_CMD1
,
477 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
481 release_pio_buffer(pio_buf
);
484 /* Caller must hold info->lock */
485 static inline void transmit_chars_dma(struct esp_struct
*info
, int num_bytes
)
489 dma_bytes
= num_bytes
;
491 if (info
->xmit_tail
+ dma_bytes
<= ESP_XMIT_SIZE
) {
492 memcpy(dma_buffer
, &(info
->xmit_buf
[info
->xmit_tail
]),
495 int i
= ESP_XMIT_SIZE
- info
->xmit_tail
;
496 memcpy(dma_buffer
, &(info
->xmit_buf
[info
->xmit_tail
]),
498 memcpy(&(dma_buffer
[i
]), info
->xmit_buf
, dma_bytes
- i
);
501 info
->xmit_cnt
-= dma_bytes
;
502 info
->xmit_tail
= (info
->xmit_tail
+ dma_bytes
) & (ESP_XMIT_SIZE
- 1);
504 if (info
->xmit_cnt
< WAKEUP_CHARS
) {
506 tty_wakeup(info
->tty
);
508 #ifdef SERIAL_DEBUG_INTR
512 if (info
->xmit_cnt
<= 0) {
513 info
->IER
&= ~UART_IER_THRI
;
514 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
515 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
519 info
->stat_flags
|= ESP_STAT_DMA_TX
;
521 flags
=claim_dma_lock();
524 set_dma_mode(dma
, DMA_MODE_WRITE
);
525 set_dma_addr(dma
, isa_virt_to_bus(dma_buffer
));
526 set_dma_count(dma
, dma_bytes
);
528 release_dma_lock(flags
);
530 serial_out(info
, UART_ESI_CMD1
, ESI_START_DMA_TX
);
533 static inline void transmit_chars_dma_done(struct esp_struct
*info
)
539 flags
=claim_dma_lock();
543 num_bytes
= dma_bytes
- get_dma_residue(dma
);
544 info
->icount
.tx
+= dma_bytes
;
545 release_dma_lock(flags
);
547 if (dma_bytes
!= num_bytes
) {
548 dma_bytes
-= num_bytes
;
549 memmove(dma_buffer
, dma_buffer
+ num_bytes
, dma_bytes
);
551 flags
=claim_dma_lock();
554 set_dma_mode(dma
, DMA_MODE_WRITE
);
555 set_dma_addr(dma
, isa_virt_to_bus(dma_buffer
));
556 set_dma_count(dma
, dma_bytes
);
558 release_dma_lock(flags
);
560 serial_out(info
, UART_ESI_CMD1
, ESI_START_DMA_TX
);
563 info
->stat_flags
&= ~ESP_STAT_DMA_TX
;
567 static inline void check_modem_status(struct esp_struct
*info
)
571 serial_out(info
, UART_ESI_CMD1
, ESI_GET_UART_STAT
);
572 status
= serial_in(info
, UART_ESI_STAT2
);
574 if (status
& UART_MSR_ANY_DELTA
) {
575 /* update input line counters */
576 if (status
& UART_MSR_TERI
)
578 if (status
& UART_MSR_DDSR
)
580 if (status
& UART_MSR_DDCD
)
582 if (status
& UART_MSR_DCTS
)
584 wake_up_interruptible(&info
->delta_msr_wait
);
587 if ((info
->flags
& ASYNC_CHECK_CD
) && (status
& UART_MSR_DDCD
)) {
588 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
589 printk("ttys%d CD now %s...", info
->line
,
590 (status
& UART_MSR_DCD
) ? "on" : "off");
592 if (status
& UART_MSR_DCD
)
593 wake_up_interruptible(&info
->open_wait
);
595 #ifdef SERIAL_DEBUG_OPEN
596 printk("scheduling hangup...");
598 tty_hangup(info
->tty
);
604 * This is the serial driver's interrupt routine
606 static irqreturn_t
rs_interrupt_single(int irq
, void *dev_id
)
608 struct esp_struct
* info
;
610 unsigned int scratch
;
612 #ifdef SERIAL_DEBUG_INTR
613 printk("rs_interrupt_single(%d)...", irq
);
615 info
= (struct esp_struct
*)dev_id
;
617 scratch
= serial_in(info
, UART_ESI_SID
);
619 spin_lock(&info
->lock
);
622 spin_unlock(&info
->lock
);
626 if (scratch
& 0x04) { /* error */
627 serial_out(info
, UART_ESI_CMD1
, ESI_GET_ERR_STAT
);
628 err_status
= serial_in(info
, UART_ESI_STAT1
);
629 serial_in(info
, UART_ESI_STAT2
);
631 if (err_status
& 0x01)
632 info
->stat_flags
|= ESP_STAT_RX_TIMEOUT
;
634 if (err_status
& 0x20) /* UART status */
635 check_modem_status(info
);
637 if (err_status
& 0x80) /* Start break */
638 wake_up_interruptible(&info
->break_wait
);
641 if ((scratch
& 0x88) || /* DMA completed or timed out */
642 (err_status
& 0x1c) /* receive error */) {
643 if (info
->stat_flags
& ESP_STAT_DMA_RX
)
644 receive_chars_dma_done(info
, err_status
);
645 else if (info
->stat_flags
& ESP_STAT_DMA_TX
)
646 transmit_chars_dma_done(info
);
649 if (!(info
->stat_flags
& (ESP_STAT_DMA_RX
| ESP_STAT_DMA_TX
)) &&
650 ((scratch
& 0x01) || (info
->stat_flags
& ESP_STAT_RX_TIMEOUT
)) &&
651 (info
->IER
& UART_IER_RDI
)) {
654 serial_out(info
, UART_ESI_CMD1
, ESI_NO_COMMAND
);
655 serial_out(info
, UART_ESI_CMD1
, ESI_GET_RX_AVAIL
);
656 num_bytes
= serial_in(info
, UART_ESI_STAT1
) << 8;
657 num_bytes
|= serial_in(info
, UART_ESI_STAT2
);
659 num_bytes
= tty_buffer_request_room(info
->tty
, num_bytes
);
663 (info
->stat_flags
& ESP_STAT_USE_PIO
) ||
664 (num_bytes
<= info
->config
.pio_threshold
))
665 receive_chars_pio(info
, num_bytes
);
667 receive_chars_dma(info
, num_bytes
);
671 if (!(info
->stat_flags
& (ESP_STAT_DMA_RX
| ESP_STAT_DMA_TX
)) &&
672 (scratch
& 0x02) && (info
->IER
& UART_IER_THRI
)) {
673 if ((info
->xmit_cnt
<= 0) || info
->tty
->stopped
) {
674 info
->IER
&= ~UART_IER_THRI
;
675 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
676 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
680 serial_out(info
, UART_ESI_CMD1
, ESI_NO_COMMAND
);
681 serial_out(info
, UART_ESI_CMD1
, ESI_GET_TX_AVAIL
);
682 num_bytes
= serial_in(info
, UART_ESI_STAT1
) << 8;
683 num_bytes
|= serial_in(info
, UART_ESI_STAT2
);
685 if (num_bytes
> info
->xmit_cnt
)
686 num_bytes
= info
->xmit_cnt
;
690 (info
->stat_flags
& ESP_STAT_USE_PIO
) ||
691 (num_bytes
<= info
->config
.pio_threshold
))
692 transmit_chars_pio(info
, num_bytes
);
694 transmit_chars_dma(info
, num_bytes
);
699 info
->last_active
= jiffies
;
701 #ifdef SERIAL_DEBUG_INTR
704 spin_unlock(&info
->lock
);
709 * -------------------------------------------------------------------
710 * Here ends the serial interrupt routines.
711 * -------------------------------------------------------------------
715 * ---------------------------------------------------------------
716 * Low level utility subroutines for the serial driver: routines to
717 * figure out the appropriate timeout for an interrupt chain, routines
718 * to initialize and startup a serial port, and routines to shutdown a
719 * serial port. Useful stuff like that.
721 * Caller should hold lock
722 * ---------------------------------------------------------------
725 static inline void esp_basic_init(struct esp_struct
* info
)
727 /* put ESPC in enhanced mode */
728 serial_out(info
, UART_ESI_CMD1
, ESI_SET_MODE
);
730 if (info
->stat_flags
& ESP_STAT_NEVER_DMA
)
731 serial_out(info
, UART_ESI_CMD2
, 0x01);
733 serial_out(info
, UART_ESI_CMD2
, 0x31);
735 /* disable interrupts for now */
736 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
737 serial_out(info
, UART_ESI_CMD2
, 0x00);
739 /* set interrupt and DMA channel */
740 serial_out(info
, UART_ESI_CMD1
, ESI_SET_IRQ
);
742 if (info
->stat_flags
& ESP_STAT_NEVER_DMA
)
743 serial_out(info
, UART_ESI_CMD2
, 0x01);
745 serial_out(info
, UART_ESI_CMD2
, (dma
<< 4) | 0x01);
747 serial_out(info
, UART_ESI_CMD1
, ESI_SET_ENH_IRQ
);
749 if (info
->line
% 8) /* secondary port */
750 serial_out(info
, UART_ESI_CMD2
, 0x0d); /* shared */
751 else if (info
->irq
== 9)
752 serial_out(info
, UART_ESI_CMD2
, 0x02);
754 serial_out(info
, UART_ESI_CMD2
, info
->irq
);
756 /* set error status mask (check this) */
757 serial_out(info
, UART_ESI_CMD1
, ESI_SET_ERR_MASK
);
759 if (info
->stat_flags
& ESP_STAT_NEVER_DMA
)
760 serial_out(info
, UART_ESI_CMD2
, 0xa1);
762 serial_out(info
, UART_ESI_CMD2
, 0xbd);
764 serial_out(info
, UART_ESI_CMD2
, 0x00);
766 /* set DMA timeout */
767 serial_out(info
, UART_ESI_CMD1
, ESI_SET_DMA_TMOUT
);
768 serial_out(info
, UART_ESI_CMD2
, 0xff);
770 /* set FIFO trigger levels */
771 serial_out(info
, UART_ESI_CMD1
, ESI_SET_TRIGGER
);
772 serial_out(info
, UART_ESI_CMD2
, info
->config
.rx_trigger
>> 8);
773 serial_out(info
, UART_ESI_CMD2
, info
->config
.rx_trigger
);
774 serial_out(info
, UART_ESI_CMD2
, info
->config
.tx_trigger
>> 8);
775 serial_out(info
, UART_ESI_CMD2
, info
->config
.tx_trigger
);
777 /* Set clock scaling and wait states */
778 serial_out(info
, UART_ESI_CMD1
, ESI_SET_PRESCALAR
);
779 serial_out(info
, UART_ESI_CMD2
, 0x04 | ESPC_SCALE
);
781 /* set reinterrupt pacing */
782 serial_out(info
, UART_ESI_CMD1
, ESI_SET_REINTR
);
783 serial_out(info
, UART_ESI_CMD2
, 0xff);
786 static int startup(struct esp_struct
* info
)
790 unsigned int num_chars
;
792 spin_lock_irqsave(&info
->lock
, flags
);
794 if (info
->flags
& ASYNC_INITIALIZED
)
797 if (!info
->xmit_buf
) {
798 info
->xmit_buf
= (unsigned char *)get_zeroed_page(GFP_ATOMIC
);
804 #ifdef SERIAL_DEBUG_OPEN
805 printk("starting up ttys%d (irq %d)...", info
->line
, info
->irq
);
808 /* Flush the RX buffer. Using the ESI flush command may cause */
809 /* wild interrupts, so read all the data instead. */
811 serial_out(info
, UART_ESI_CMD1
, ESI_NO_COMMAND
);
812 serial_out(info
, UART_ESI_CMD1
, ESI_GET_RX_AVAIL
);
813 num_chars
= serial_in(info
, UART_ESI_STAT1
) << 8;
814 num_chars
|= serial_in(info
, UART_ESI_STAT2
);
816 while (num_chars
> 1) {
817 inw(info
->port
+ UART_ESI_RX
);
822 serial_in(info
, UART_ESI_RX
);
824 /* set receive character timeout */
825 serial_out(info
, UART_ESI_CMD1
, ESI_SET_RX_TIMEOUT
);
826 serial_out(info
, UART_ESI_CMD2
, info
->config
.rx_timeout
);
828 /* clear all flags except the "never DMA" flag */
829 info
->stat_flags
&= ESP_STAT_NEVER_DMA
;
831 if (info
->stat_flags
& ESP_STAT_NEVER_DMA
)
832 info
->stat_flags
|= ESP_STAT_USE_PIO
;
834 spin_unlock_irqrestore(&info
->lock
, flags
);
840 retval
= request_irq(info
->irq
, rs_interrupt_single
, IRQF_SHARED
,
844 if (capable(CAP_SYS_ADMIN
)) {
846 set_bit(TTY_IO_ERROR
,
853 if (!(info
->stat_flags
& ESP_STAT_USE_PIO
) && !dma_buffer
) {
854 dma_buffer
= (char *)__get_dma_pages(
855 GFP_KERNEL
, get_order(DMA_BUFFER_SZ
));
857 /* use PIO mode if DMA buf/chan cannot be allocated */
859 info
->stat_flags
|= ESP_STAT_USE_PIO
;
860 else if (request_dma(dma
, "esp serial")) {
861 free_pages((unsigned long)dma_buffer
,
862 get_order(DMA_BUFFER_SZ
));
864 info
->stat_flags
|= ESP_STAT_USE_PIO
;
869 info
->MCR
= UART_MCR_DTR
| UART_MCR_RTS
| UART_MCR_OUT2
;
871 spin_lock_irqsave(&info
->lock
, flags
);
872 serial_out(info
, UART_ESI_CMD1
, ESI_WRITE_UART
);
873 serial_out(info
, UART_ESI_CMD2
, UART_MCR
);
874 serial_out(info
, UART_ESI_CMD2
, info
->MCR
);
877 * Finally, enable interrupts
879 /* info->IER = UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI; */
880 info
->IER
= UART_IER_RLSI
| UART_IER_RDI
| UART_IER_DMA_TMOUT
|
882 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
883 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
886 clear_bit(TTY_IO_ERROR
, &info
->tty
->flags
);
887 info
->xmit_cnt
= info
->xmit_head
= info
->xmit_tail
= 0;
888 spin_unlock_irqrestore(&info
->lock
, flags
);
891 * Set up the tty->alt_speed kludge
894 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_HI
)
895 info
->tty
->alt_speed
= 57600;
896 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_VHI
)
897 info
->tty
->alt_speed
= 115200;
898 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_SHI
)
899 info
->tty
->alt_speed
= 230400;
900 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_WARP
)
901 info
->tty
->alt_speed
= 460800;
905 * set the speed of the serial port
908 info
->flags
|= ASYNC_INITIALIZED
;
912 spin_unlock_irqrestore(&info
->lock
, flags
);
918 * This routine will shutdown a serial port; interrupts are disabled, and
919 * DTR is dropped if the hangup on close termio flag is on.
921 static void shutdown(struct esp_struct
* info
)
923 unsigned long flags
, f
;
925 if (!(info
->flags
& ASYNC_INITIALIZED
))
928 #ifdef SERIAL_DEBUG_OPEN
929 printk("Shutting down serial port %d (irq %d)....", info
->line
,
933 spin_lock_irqsave(&info
->lock
, flags
);
935 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
936 * here so the queue might never be waken up
938 wake_up_interruptible(&info
->delta_msr_wait
);
939 wake_up_interruptible(&info
->break_wait
);
941 /* stop a DMA transfer on the port being closed */
942 /* DMA lock is higher priority always */
943 if (info
->stat_flags
& (ESP_STAT_DMA_RX
| ESP_STAT_DMA_TX
)) {
955 free_irq(info
->irq
, info
);
958 struct esp_struct
*current_port
= ports
;
960 while (current_port
) {
961 if ((current_port
!= info
) &&
962 (current_port
->flags
& ASYNC_INITIALIZED
))
965 current_port
= current_port
->next_port
;
970 free_pages((unsigned long)dma_buffer
,
971 get_order(DMA_BUFFER_SZ
));
976 if (info
->xmit_buf
) {
977 free_page((unsigned long) info
->xmit_buf
);
978 info
->xmit_buf
= NULL
;
982 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
983 serial_out(info
, UART_ESI_CMD2
, 0x00);
985 if (!info
->tty
|| (info
->tty
->termios
->c_cflag
& HUPCL
))
986 info
->MCR
&= ~(UART_MCR_DTR
|UART_MCR_RTS
);
988 info
->MCR
&= ~UART_MCR_OUT2
;
989 serial_out(info
, UART_ESI_CMD1
, ESI_WRITE_UART
);
990 serial_out(info
, UART_ESI_CMD2
, UART_MCR
);
991 serial_out(info
, UART_ESI_CMD2
, info
->MCR
);
994 set_bit(TTY_IO_ERROR
, &info
->tty
->flags
);
996 info
->flags
&= ~ASYNC_INITIALIZED
;
997 spin_unlock_irqrestore(&info
->lock
, flags
);
1001 * This routine is called to set the UART divisor registers to match
1002 * the specified baud rate for a serial port.
1004 static void change_speed(struct esp_struct
*info
)
1006 unsigned short port
;
1008 unsigned cflag
,cval
;
1010 unsigned char flow1
= 0, flow2
= 0;
1011 unsigned long flags
;
1013 if (!info
->tty
|| !info
->tty
->termios
)
1015 cflag
= info
->tty
->termios
->c_cflag
;
1018 /* byte size and parity */
1019 switch (cflag
& CSIZE
) {
1020 case CS5
: cval
= 0x00; bits
= 7; break;
1021 case CS6
: cval
= 0x01; bits
= 8; break;
1022 case CS7
: cval
= 0x02; bits
= 9; break;
1023 case CS8
: cval
= 0x03; bits
= 10; break;
1024 default: cval
= 0x00; bits
= 7; break;
1026 if (cflag
& CSTOPB
) {
1030 if (cflag
& PARENB
) {
1031 cval
|= UART_LCR_PARITY
;
1034 if (!(cflag
& PARODD
))
1035 cval
|= UART_LCR_EPAR
;
1038 cval
|= UART_LCR_SPAR
;
1041 baud
= tty_get_baud_rate(info
->tty
);
1042 if (baud
== 38400 &&
1043 ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_CUST
))
1044 quot
= info
->custom_divisor
;
1047 /* Special case since 134 is really 134.5 */
1048 quot
= (2*BASE_BAUD
/ 269);
1050 quot
= BASE_BAUD
/ baud
;
1052 /* If the quotient is ever zero, default to 9600 bps */
1054 quot
= BASE_BAUD
/ 9600;
1056 info
->timeout
= ((1024 * HZ
* bits
* quot
) / BASE_BAUD
) + (HZ
/ 50);
1058 /* CTS flow control flag and modem status interrupts */
1059 /* info->IER &= ~UART_IER_MSI; */
1060 if (cflag
& CRTSCTS
) {
1061 info
->flags
|= ASYNC_CTS_FLOW
;
1062 /* info->IER |= UART_IER_MSI; */
1066 info
->flags
&= ~ASYNC_CTS_FLOW
;
1068 info
->flags
&= ~ASYNC_CHECK_CD
;
1070 info
->flags
|= ASYNC_CHECK_CD
;
1071 /* info->IER |= UART_IER_MSI; */
1075 * Set up parity check flag
1077 info
->read_status_mask
= UART_LSR_OE
| UART_LSR_THRE
| UART_LSR_DR
;
1078 if (I_INPCK(info
->tty
))
1079 info
->read_status_mask
|= UART_LSR_FE
| UART_LSR_PE
;
1080 if (I_BRKINT(info
->tty
) || I_PARMRK(info
->tty
))
1081 info
->read_status_mask
|= UART_LSR_BI
;
1083 info
->ignore_status_mask
= 0;
1085 /* This should be safe, but for some broken bits of hardware... */
1086 if (I_IGNPAR(info
->tty
)) {
1087 info
->ignore_status_mask
|= UART_LSR_PE
| UART_LSR_FE
;
1088 info
->read_status_mask
|= UART_LSR_PE
| UART_LSR_FE
;
1091 if (I_IGNBRK(info
->tty
)) {
1092 info
->ignore_status_mask
|= UART_LSR_BI
;
1093 info
->read_status_mask
|= UART_LSR_BI
;
1095 * If we're ignore parity and break indicators, ignore
1096 * overruns too. (For real raw support).
1098 if (I_IGNPAR(info
->tty
)) {
1099 info
->ignore_status_mask
|= UART_LSR_OE
| \
1100 UART_LSR_PE
| UART_LSR_FE
;
1101 info
->read_status_mask
|= UART_LSR_OE
| \
1102 UART_LSR_PE
| UART_LSR_FE
;
1106 if (I_IXOFF(info
->tty
))
1109 spin_lock_irqsave(&info
->lock
, flags
);
1111 serial_out(info
, UART_ESI_CMD1
, ESI_SET_BAUD
);
1112 serial_out(info
, UART_ESI_CMD2
, quot
>> 8);
1113 serial_out(info
, UART_ESI_CMD2
, quot
& 0xff);
1115 /* set data bits, parity, etc. */
1116 serial_out(info
, UART_ESI_CMD1
, ESI_WRITE_UART
);
1117 serial_out(info
, UART_ESI_CMD2
, UART_LCR
);
1118 serial_out(info
, UART_ESI_CMD2
, cval
);
1120 /* Enable flow control */
1121 serial_out(info
, UART_ESI_CMD1
, ESI_SET_FLOW_CNTL
);
1122 serial_out(info
, UART_ESI_CMD2
, flow1
);
1123 serial_out(info
, UART_ESI_CMD2
, flow2
);
1125 /* set flow control characters (XON/XOFF only) */
1126 if (I_IXOFF(info
->tty
)) {
1127 serial_out(info
, UART_ESI_CMD1
, ESI_SET_FLOW_CHARS
);
1128 serial_out(info
, UART_ESI_CMD2
, START_CHAR(info
->tty
));
1129 serial_out(info
, UART_ESI_CMD2
, STOP_CHAR(info
->tty
));
1130 serial_out(info
, UART_ESI_CMD2
, 0x10);
1131 serial_out(info
, UART_ESI_CMD2
, 0x21);
1132 switch (cflag
& CSIZE
) {
1134 serial_out(info
, UART_ESI_CMD2
, 0x1f);
1137 serial_out(info
, UART_ESI_CMD2
, 0x3f);
1141 serial_out(info
, UART_ESI_CMD2
, 0x7f);
1144 serial_out(info
, UART_ESI_CMD2
, 0xff);
1149 /* Set high/low water */
1150 serial_out(info
, UART_ESI_CMD1
, ESI_SET_FLOW_LVL
);
1151 serial_out(info
, UART_ESI_CMD2
, info
->config
.flow_off
>> 8);
1152 serial_out(info
, UART_ESI_CMD2
, info
->config
.flow_off
);
1153 serial_out(info
, UART_ESI_CMD2
, info
->config
.flow_on
>> 8);
1154 serial_out(info
, UART_ESI_CMD2
, info
->config
.flow_on
);
1156 spin_unlock_irqrestore(&info
->lock
, flags
);
1159 static void rs_put_char(struct tty_struct
*tty
, unsigned char ch
)
1161 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
1162 unsigned long flags
;
1164 if (serial_paranoia_check(info
, tty
->name
, "rs_put_char"))
1167 if (!info
->xmit_buf
)
1170 spin_lock_irqsave(&info
->lock
, flags
);
1171 if (info
->xmit_cnt
< ESP_XMIT_SIZE
- 1) {
1172 info
->xmit_buf
[info
->xmit_head
++] = ch
;
1173 info
->xmit_head
&= ESP_XMIT_SIZE
-1;
1176 spin_unlock_irqrestore(&info
->lock
, flags
);
1179 static void rs_flush_chars(struct tty_struct
*tty
)
1181 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
1182 unsigned long flags
;
1184 if (serial_paranoia_check(info
, tty
->name
, "rs_flush_chars"))
1187 spin_lock_irqsave(&info
->lock
, flags
);
1189 if (info
->xmit_cnt
<= 0 || tty
->stopped
|| !info
->xmit_buf
)
1192 if (!(info
->IER
& UART_IER_THRI
)) {
1193 info
->IER
|= UART_IER_THRI
;
1194 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
1195 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
1198 spin_unlock_irqrestore(&info
->lock
, flags
);
1201 static int rs_write(struct tty_struct
* tty
,
1202 const unsigned char *buf
, int count
)
1205 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
1206 unsigned long flags
;
1208 if (serial_paranoia_check(info
, tty
->name
, "rs_write"))
1211 if (!info
->xmit_buf
)
1215 /* Thanks to R. Wolff for suggesting how to do this with */
1216 /* interrupts enabled */
1219 t
= ESP_XMIT_SIZE
- info
->xmit_cnt
- 1;
1224 t
= ESP_XMIT_SIZE
- info
->xmit_head
;
1232 memcpy(info
->xmit_buf
+ info
->xmit_head
, buf
, c
);
1234 info
->xmit_head
= (info
->xmit_head
+ c
) & (ESP_XMIT_SIZE
-1);
1235 info
->xmit_cnt
+= c
;
1241 spin_lock_irqsave(&info
->lock
, flags
);
1243 if (info
->xmit_cnt
&& !tty
->stopped
&& !(info
->IER
& UART_IER_THRI
)) {
1244 info
->IER
|= UART_IER_THRI
;
1245 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
1246 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
1249 spin_unlock_irqrestore(&info
->lock
, flags
);
1253 static int rs_write_room(struct tty_struct
*tty
)
1255 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
1257 unsigned long flags
;
1259 if (serial_paranoia_check(info
, tty
->name
, "rs_write_room"))
1262 spin_lock_irqsave(&info
->lock
, flags
);
1264 ret
= ESP_XMIT_SIZE
- info
->xmit_cnt
- 1;
1267 spin_unlock_irqrestore(&info
->lock
, flags
);
1271 static int rs_chars_in_buffer(struct tty_struct
*tty
)
1273 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
1275 if (serial_paranoia_check(info
, tty
->name
, "rs_chars_in_buffer"))
1277 return info
->xmit_cnt
;
1280 static void rs_flush_buffer(struct tty_struct
*tty
)
1282 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
1283 unsigned long flags
;
1285 if (serial_paranoia_check(info
, tty
->name
, "rs_flush_buffer"))
1287 spin_lock_irqsave(&info
->lock
, flags
);
1288 info
->xmit_cnt
= info
->xmit_head
= info
->xmit_tail
= 0;
1289 spin_unlock_irqrestore(&info
->lock
, flags
);
1294 * ------------------------------------------------------------
1297 * This routine is called by the upper-layer tty layer to signal that
1298 * incoming characters should be throttled.
1299 * ------------------------------------------------------------
1301 static void rs_throttle(struct tty_struct
* tty
)
1303 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
1304 unsigned long flags
;
1305 #ifdef SERIAL_DEBUG_THROTTLE
1308 printk("throttle %s: %d....\n", tty_name(tty
, buf
),
1309 tty
->ldisc
.chars_in_buffer(tty
));
1312 if (serial_paranoia_check(info
, tty
->name
, "rs_throttle"))
1315 spin_lock_irqsave(&info
->lock
, flags
);
1316 info
->IER
&= ~UART_IER_RDI
;
1317 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
1318 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
1319 serial_out(info
, UART_ESI_CMD1
, ESI_SET_RX_TIMEOUT
);
1320 serial_out(info
, UART_ESI_CMD2
, 0x00);
1321 spin_unlock_irqrestore(&info
->lock
, flags
);
1324 static void rs_unthrottle(struct tty_struct
* tty
)
1326 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
1327 unsigned long flags
;
1328 #ifdef SERIAL_DEBUG_THROTTLE
1331 printk("unthrottle %s: %d....\n", tty_name(tty
, buf
),
1332 tty
->ldisc
.chars_in_buffer(tty
));
1335 if (serial_paranoia_check(info
, tty
->name
, "rs_unthrottle"))
1338 spin_lock_irqsave(&info
->lock
, flags
);
1339 info
->IER
|= UART_IER_RDI
;
1340 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
1341 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
1342 serial_out(info
, UART_ESI_CMD1
, ESI_SET_RX_TIMEOUT
);
1343 serial_out(info
, UART_ESI_CMD2
, info
->config
.rx_timeout
);
1344 spin_unlock_irqrestore(&info
->lock
, flags
);
1348 * ------------------------------------------------------------
1349 * rs_ioctl() and friends
1350 * ------------------------------------------------------------
1353 static int get_serial_info(struct esp_struct
* info
,
1354 struct serial_struct __user
*retinfo
)
1356 struct serial_struct tmp
;
1359 memset(&tmp
, 0, sizeof(tmp
));
1360 tmp
.type
= PORT_16550A
;
1361 tmp
.line
= info
->line
;
1362 tmp
.port
= info
->port
;
1363 tmp
.irq
= info
->irq
;
1364 tmp
.flags
= info
->flags
;
1365 tmp
.xmit_fifo_size
= 1024;
1366 tmp
.baud_base
= BASE_BAUD
;
1367 tmp
.close_delay
= info
->close_delay
;
1368 tmp
.closing_wait
= info
->closing_wait
;
1369 tmp
.custom_divisor
= info
->custom_divisor
;
1372 if (copy_to_user(retinfo
,&tmp
,sizeof(*retinfo
)))
1377 static int get_esp_config(struct esp_struct
* info
,
1378 struct hayes_esp_config __user
*retinfo
)
1380 struct hayes_esp_config tmp
;
1385 memset(&tmp
, 0, sizeof(tmp
));
1387 tmp
.rx_timeout
= info
->config
.rx_timeout
;
1388 tmp
.rx_trigger
= info
->config
.rx_trigger
;
1389 tmp
.tx_trigger
= info
->config
.tx_trigger
;
1390 tmp
.flow_off
= info
->config
.flow_off
;
1391 tmp
.flow_on
= info
->config
.flow_on
;
1392 tmp
.pio_threshold
= info
->config
.pio_threshold
;
1393 tmp
.dma_channel
= (info
->stat_flags
& ESP_STAT_NEVER_DMA
? 0 : dma
);
1396 return copy_to_user(retinfo
, &tmp
, sizeof(*retinfo
)) ? -EFAULT
: 0;
1399 static int set_serial_info(struct esp_struct
* info
,
1400 struct serial_struct __user
*new_info
)
1402 struct serial_struct new_serial
;
1403 struct esp_struct old_info
;
1404 unsigned int change_irq
;
1406 struct esp_struct
*current_async
;
1408 if (copy_from_user(&new_serial
,new_info
,sizeof(new_serial
)))
1412 if ((new_serial
.type
!= PORT_16550A
) ||
1413 (new_serial
.hub6
) ||
1414 (info
->port
!= new_serial
.port
) ||
1415 (new_serial
.baud_base
!= BASE_BAUD
) ||
1416 (new_serial
.irq
> 15) ||
1417 (new_serial
.irq
< 2) ||
1418 (new_serial
.irq
== 6) ||
1419 (new_serial
.irq
== 8) ||
1420 (new_serial
.irq
== 13))
1423 change_irq
= new_serial
.irq
!= info
->irq
;
1425 if (change_irq
&& (info
->line
% 8))
1428 if (!capable(CAP_SYS_ADMIN
)) {
1430 (new_serial
.close_delay
!= info
->close_delay
) ||
1431 ((new_serial
.flags
& ~ASYNC_USR_MASK
) !=
1432 (info
->flags
& ~ASYNC_USR_MASK
)))
1434 info
->flags
= ((info
->flags
& ~ASYNC_USR_MASK
) |
1435 (new_serial
.flags
& ASYNC_USR_MASK
));
1436 info
->custom_divisor
= new_serial
.custom_divisor
;
1438 if (new_serial
.irq
== 2)
1442 current_async
= ports
;
1444 while (current_async
) {
1445 if ((current_async
->line
>= info
->line
) &&
1446 (current_async
->line
< (info
->line
+ 8))) {
1447 if (current_async
== info
) {
1448 if (current_async
->count
> 1)
1450 } else if (current_async
->count
)
1454 current_async
= current_async
->next_port
;
1459 * OK, past this point, all the error checking has been done.
1460 * At this point, we start making changes.....
1463 info
->flags
= ((info
->flags
& ~ASYNC_FLAGS
) |
1464 (new_serial
.flags
& ASYNC_FLAGS
));
1465 info
->custom_divisor
= new_serial
.custom_divisor
;
1466 info
->close_delay
= new_serial
.close_delay
* HZ
/100;
1467 info
->closing_wait
= new_serial
.closing_wait
* HZ
/100;
1471 * We need to shutdown the serial port at the old
1472 * port/irq combination.
1476 current_async
= ports
;
1478 while (current_async
) {
1479 if ((current_async
->line
>= info
->line
) &&
1480 (current_async
->line
< (info
->line
+ 8)))
1481 current_async
->irq
= new_serial
.irq
;
1483 current_async
= current_async
->next_port
;
1486 serial_out(info
, UART_ESI_CMD1
, ESI_SET_ENH_IRQ
);
1488 serial_out(info
, UART_ESI_CMD2
, 0x02);
1490 serial_out(info
, UART_ESI_CMD2
, info
->irq
);
1494 if (info
->flags
& ASYNC_INITIALIZED
) {
1495 if (((old_info
.flags
& ASYNC_SPD_MASK
) !=
1496 (info
->flags
& ASYNC_SPD_MASK
)) ||
1497 (old_info
.custom_divisor
!= info
->custom_divisor
)) {
1498 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_HI
)
1499 info
->tty
->alt_speed
= 57600;
1500 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_VHI
)
1501 info
->tty
->alt_speed
= 115200;
1502 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_SHI
)
1503 info
->tty
->alt_speed
= 230400;
1504 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_WARP
)
1505 info
->tty
->alt_speed
= 460800;
1509 retval
= startup(info
);
1514 static int set_esp_config(struct esp_struct
* info
,
1515 struct hayes_esp_config __user
* new_info
)
1517 struct hayes_esp_config new_config
;
1518 unsigned int change_dma
;
1520 struct esp_struct
*current_async
;
1521 unsigned long flags
;
1523 /* Perhaps a non-sysadmin user should be able to do some of these */
1524 /* operations. I haven't decided yet. */
1526 if (!capable(CAP_SYS_ADMIN
))
1529 if (copy_from_user(&new_config
, new_info
, sizeof(new_config
)))
1532 if ((new_config
.flow_on
>= new_config
.flow_off
) ||
1533 (new_config
.rx_trigger
< 1) ||
1534 (new_config
.tx_trigger
< 1) ||
1535 (new_config
.flow_off
< 1) ||
1536 (new_config
.flow_on
< 1) ||
1537 (new_config
.rx_trigger
> 1023) ||
1538 (new_config
.tx_trigger
> 1023) ||
1539 (new_config
.flow_off
> 1023) ||
1540 (new_config
.flow_on
> 1023) ||
1541 (new_config
.pio_threshold
< 0) ||
1542 (new_config
.pio_threshold
> 1024))
1545 if ((new_config
.dma_channel
!= 1) && (new_config
.dma_channel
!= 3))
1546 new_config
.dma_channel
= 0;
1548 if (info
->stat_flags
& ESP_STAT_NEVER_DMA
)
1549 change_dma
= new_config
.dma_channel
;
1551 change_dma
= (new_config
.dma_channel
!= dma
);
1554 if (new_config
.dma_channel
) {
1555 /* PIO mode to DMA mode transition OR */
1556 /* change current DMA channel */
1558 current_async
= ports
;
1560 while (current_async
) {
1561 if (current_async
== info
) {
1562 if (current_async
->count
> 1)
1564 } else if (current_async
->count
)
1568 current_async
->next_port
;
1572 dma
= new_config
.dma_channel
;
1573 info
->stat_flags
&= ~ESP_STAT_NEVER_DMA
;
1575 /* all ports must use the same DMA channel */
1577 spin_lock_irqsave(&info
->lock
, flags
);
1578 current_async
= ports
;
1580 while (current_async
) {
1581 esp_basic_init(current_async
);
1582 current_async
= current_async
->next_port
;
1584 spin_unlock_irqrestore(&info
->lock
, flags
);
1586 /* DMA mode to PIO mode only */
1588 if (info
->count
> 1)
1592 spin_lock_irqsave(&info
->lock
, flags
);
1593 info
->stat_flags
|= ESP_STAT_NEVER_DMA
;
1594 esp_basic_init(info
);
1595 spin_unlock_irqrestore(&info
->lock
, flags
);
1599 info
->config
.pio_threshold
= new_config
.pio_threshold
;
1601 if ((new_config
.flow_off
!= info
->config
.flow_off
) ||
1602 (new_config
.flow_on
!= info
->config
.flow_on
)) {
1603 unsigned long flags
;
1605 info
->config
.flow_off
= new_config
.flow_off
;
1606 info
->config
.flow_on
= new_config
.flow_on
;
1608 spin_lock_irqsave(&info
->lock
, flags
);
1609 serial_out(info
, UART_ESI_CMD1
, ESI_SET_FLOW_LVL
);
1610 serial_out(info
, UART_ESI_CMD2
, new_config
.flow_off
>> 8);
1611 serial_out(info
, UART_ESI_CMD2
, new_config
.flow_off
);
1612 serial_out(info
, UART_ESI_CMD2
, new_config
.flow_on
>> 8);
1613 serial_out(info
, UART_ESI_CMD2
, new_config
.flow_on
);
1614 spin_unlock_irqrestore(&info
->lock
, flags
);
1617 if ((new_config
.rx_trigger
!= info
->config
.rx_trigger
) ||
1618 (new_config
.tx_trigger
!= info
->config
.tx_trigger
)) {
1619 unsigned long flags
;
1621 info
->config
.rx_trigger
= new_config
.rx_trigger
;
1622 info
->config
.tx_trigger
= new_config
.tx_trigger
;
1623 spin_lock_irqsave(&info
->lock
, flags
);
1624 serial_out(info
, UART_ESI_CMD1
, ESI_SET_TRIGGER
);
1625 serial_out(info
, UART_ESI_CMD2
,
1626 new_config
.rx_trigger
>> 8);
1627 serial_out(info
, UART_ESI_CMD2
, new_config
.rx_trigger
);
1628 serial_out(info
, UART_ESI_CMD2
,
1629 new_config
.tx_trigger
>> 8);
1630 serial_out(info
, UART_ESI_CMD2
, new_config
.tx_trigger
);
1631 spin_unlock_irqrestore(&info
->lock
, flags
);
1634 if (new_config
.rx_timeout
!= info
->config
.rx_timeout
) {
1635 unsigned long flags
;
1637 info
->config
.rx_timeout
= new_config
.rx_timeout
;
1638 spin_lock_irqsave(&info
->lock
, flags
);
1640 if (info
->IER
& UART_IER_RDI
) {
1641 serial_out(info
, UART_ESI_CMD1
,
1642 ESI_SET_RX_TIMEOUT
);
1643 serial_out(info
, UART_ESI_CMD2
,
1644 new_config
.rx_timeout
);
1647 spin_unlock_irqrestore(&info
->lock
, flags
);
1650 if (!(info
->flags
& ASYNC_INITIALIZED
))
1651 retval
= startup(info
);
1657 * get_lsr_info - get line status register info
1659 * Purpose: Let user call ioctl() to get info when the UART physically
1660 * is emptied. On bus types like RS485, the transmitter must
1661 * release the bus after transmitting. This must be done when
1662 * the transmit shift register is empty, not be done when the
1663 * transmit holding register is empty. This functionality
1664 * allows an RS485 driver to be written in user space.
1666 static int get_lsr_info(struct esp_struct
* info
, unsigned int __user
*value
)
1668 unsigned char status
;
1669 unsigned int result
;
1670 unsigned long flags
;
1672 spin_lock_irqsave(&info
->lock
, flags
);
1673 serial_out(info
, UART_ESI_CMD1
, ESI_GET_UART_STAT
);
1674 status
= serial_in(info
, UART_ESI_STAT1
);
1675 spin_unlock_irqrestore(&info
->lock
, flags
);
1676 result
= ((status
& UART_LSR_TEMT
) ? TIOCSER_TEMT
: 0);
1677 return put_user(result
,value
);
1681 static int esp_tiocmget(struct tty_struct
*tty
, struct file
*file
)
1683 struct esp_struct
* info
= (struct esp_struct
*)tty
->driver_data
;
1684 unsigned char control
, status
;
1685 unsigned long flags
;
1687 if (serial_paranoia_check(info
, tty
->name
, __FUNCTION__
))
1689 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1692 control
= info
->MCR
;
1694 spin_lock_irqsave(&info
->lock
, flags
);
1695 serial_out(info
, UART_ESI_CMD1
, ESI_GET_UART_STAT
);
1696 status
= serial_in(info
, UART_ESI_STAT2
);
1697 spin_unlock_irqrestore(&info
->lock
, flags
);
1699 return ((control
& UART_MCR_RTS
) ? TIOCM_RTS
: 0)
1700 | ((control
& UART_MCR_DTR
) ? TIOCM_DTR
: 0)
1701 | ((status
& UART_MSR_DCD
) ? TIOCM_CAR
: 0)
1702 | ((status
& UART_MSR_RI
) ? TIOCM_RNG
: 0)
1703 | ((status
& UART_MSR_DSR
) ? TIOCM_DSR
: 0)
1704 | ((status
& UART_MSR_CTS
) ? TIOCM_CTS
: 0);
1707 static int esp_tiocmset(struct tty_struct
*tty
, struct file
*file
,
1708 unsigned int set
, unsigned int clear
)
1710 struct esp_struct
* info
= (struct esp_struct
*)tty
->driver_data
;
1711 unsigned long flags
;
1713 if (serial_paranoia_check(info
, tty
->name
, __FUNCTION__
))
1715 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1718 spin_lock_irqsave(&info
->lock
, flags
);
1720 if (set
& TIOCM_RTS
)
1721 info
->MCR
|= UART_MCR_RTS
;
1722 if (set
& TIOCM_DTR
)
1723 info
->MCR
|= UART_MCR_DTR
;
1725 if (clear
& TIOCM_RTS
)
1726 info
->MCR
&= ~UART_MCR_RTS
;
1727 if (clear
& TIOCM_DTR
)
1728 info
->MCR
&= ~UART_MCR_DTR
;
1730 serial_out(info
, UART_ESI_CMD1
, ESI_WRITE_UART
);
1731 serial_out(info
, UART_ESI_CMD2
, UART_MCR
);
1732 serial_out(info
, UART_ESI_CMD2
, info
->MCR
);
1734 spin_unlock_irqrestore(&info
->lock
, flags
);
1739 * rs_break() --- routine which turns the break handling on or off
1741 static void esp_break(struct tty_struct
*tty
, int break_state
)
1743 struct esp_struct
* info
= (struct esp_struct
*)tty
->driver_data
;
1744 unsigned long flags
;
1746 if (serial_paranoia_check(info
, tty
->name
, "esp_break"))
1749 if (break_state
== -1) {
1750 spin_lock_irqsave(&info
->lock
, flags
);
1751 serial_out(info
, UART_ESI_CMD1
, ESI_ISSUE_BREAK
);
1752 serial_out(info
, UART_ESI_CMD2
, 0x01);
1753 spin_unlock_irqrestore(&info
->lock
, flags
);
1755 /* FIXME - new style wait needed here */
1756 interruptible_sleep_on(&info
->break_wait
);
1758 spin_lock_irqsave(&info
->lock
, flags
);
1759 serial_out(info
, UART_ESI_CMD1
, ESI_ISSUE_BREAK
);
1760 serial_out(info
, UART_ESI_CMD2
, 0x00);
1761 spin_unlock_irqrestore(&info
->lock
, flags
);
1765 static int rs_ioctl(struct tty_struct
*tty
, struct file
* file
,
1766 unsigned int cmd
, unsigned long arg
)
1768 struct esp_struct
* info
= (struct esp_struct
*)tty
->driver_data
;
1769 struct async_icount cprev
, cnow
; /* kernel counter temps */
1770 struct serial_icounter_struct __user
*p_cuser
; /* user space */
1771 void __user
*argp
= (void __user
*)arg
;
1772 unsigned long flags
;
1775 if (serial_paranoia_check(info
, tty
->name
, "rs_ioctl"))
1778 if ((cmd
!= TIOCGSERIAL
) && (cmd
!= TIOCSSERIAL
) &&
1779 (cmd
!= TIOCSERCONFIG
) && (cmd
!= TIOCSERGWILD
) &&
1780 (cmd
!= TIOCSERSWILD
) && (cmd
!= TIOCSERGSTRUCT
) &&
1781 (cmd
!= TIOCMIWAIT
) && (cmd
!= TIOCGICOUNT
) &&
1782 (cmd
!= TIOCGHAYESESP
) && (cmd
!= TIOCSHAYESESP
)) {
1783 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1789 return get_serial_info(info
, argp
);
1792 ret
= set_serial_info(info
, argp
);
1796 /* do not reconfigure after initial configuration */
1800 return put_user(0L, (unsigned long __user
*)argp
);
1802 case TIOCSERGETLSR
: /* Get line status register */
1803 return get_lsr_info(info
, argp
);
1806 if (!capable(CAP_SYS_ADMIN
))
1811 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1812 * - mask passed in arg for lines of interest
1813 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1814 * Caller should use TIOCGICOUNT to see which one it was
1817 spin_lock_irqsave(&info
->lock
, flags
);
1818 cprev
= info
->icount
; /* note the counters on entry */
1819 spin_unlock_irqrestore(&info
->lock
, flags
);
1821 /* FIXME: convert to new style wakeup */
1822 interruptible_sleep_on(&info
->delta_msr_wait
);
1823 /* see if a signal did it */
1824 if (signal_pending(current
))
1825 return -ERESTARTSYS
;
1826 spin_lock_irqsave(&info
->lock
, flags
);
1827 cnow
= info
->icount
; /* atomic copy */
1828 spin_unlock_irqrestore(&info
->lock
, flags
);
1829 if (cnow
.rng
== cprev
.rng
&&
1830 cnow
.dsr
== cprev
.dsr
&&
1831 cnow
.dcd
== cprev
.dcd
&&
1832 cnow
.cts
== cprev
.cts
)
1833 return -EIO
; /* no change => error */
1834 if (((arg
& TIOCM_RNG
) &&
1835 (cnow
.rng
!= cprev
.rng
)) ||
1836 ((arg
& TIOCM_DSR
) &&
1837 (cnow
.dsr
!= cprev
.dsr
)) ||
1838 ((arg
& TIOCM_CD
) &&
1839 (cnow
.dcd
!= cprev
.dcd
)) ||
1840 ((arg
& TIOCM_CTS
) &&
1841 (cnow
.cts
!= cprev
.cts
)) ) {
1849 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1850 * Return: write counters to the user passed counter struct
1851 * NB: both 1->0 and 0->1 transitions are counted except for
1852 * RI where only 0->1 is counted.
1855 spin_lock_irqsave(&info
->lock
, flags
);
1856 cnow
= info
->icount
;
1857 spin_unlock_irqrestore(&info
->lock
, flags
);
1859 if (put_user(cnow
.cts
, &p_cuser
->cts
) ||
1860 put_user(cnow
.dsr
, &p_cuser
->dsr
) ||
1861 put_user(cnow
.rng
, &p_cuser
->rng
) ||
1862 put_user(cnow
.dcd
, &p_cuser
->dcd
))
1867 return get_esp_config(info
, argp
);
1870 ret
= set_esp_config(info
, argp
);
1874 return -ENOIOCTLCMD
;
1879 static void rs_set_termios(struct tty_struct
*tty
, struct ktermios
*old_termios
)
1881 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
1882 unsigned long flags
;
1886 spin_lock_irqsave(&info
->lock
, flags
);
1888 /* Handle transition to B0 status */
1889 if ((old_termios
->c_cflag
& CBAUD
) &&
1890 !(tty
->termios
->c_cflag
& CBAUD
)) {
1891 info
->MCR
&= ~(UART_MCR_DTR
|UART_MCR_RTS
);
1892 serial_out(info
, UART_ESI_CMD1
, ESI_WRITE_UART
);
1893 serial_out(info
, UART_ESI_CMD2
, UART_MCR
);
1894 serial_out(info
, UART_ESI_CMD2
, info
->MCR
);
1897 /* Handle transition away from B0 status */
1898 if (!(old_termios
->c_cflag
& CBAUD
) &&
1899 (tty
->termios
->c_cflag
& CBAUD
)) {
1900 info
->MCR
|= (UART_MCR_DTR
| UART_MCR_RTS
);
1901 serial_out(info
, UART_ESI_CMD1
, ESI_WRITE_UART
);
1902 serial_out(info
, UART_ESI_CMD2
, UART_MCR
);
1903 serial_out(info
, UART_ESI_CMD2
, info
->MCR
);
1906 spin_unlock_irqrestore(&info
->lock
, flags
);
1908 /* Handle turning of CRTSCTS */
1909 if ((old_termios
->c_cflag
& CRTSCTS
) &&
1910 !(tty
->termios
->c_cflag
& CRTSCTS
)) {
1916 * ------------------------------------------------------------
1919 * This routine is called when the serial port gets closed. First, we
1920 * wait for the last remaining data to be sent. Then, we unlink its
1921 * async structure from the interrupt chain if necessary, and we free
1922 * that IRQ if nothing is left in the chain.
1923 * ------------------------------------------------------------
1925 static void rs_close(struct tty_struct
*tty
, struct file
* filp
)
1927 struct esp_struct
* info
= (struct esp_struct
*)tty
->driver_data
;
1928 unsigned long flags
;
1930 if (!info
|| serial_paranoia_check(info
, tty
->name
, "rs_close"))
1933 spin_lock_irqsave(&info
->lock
, flags
);
1935 if (tty_hung_up_p(filp
)) {
1936 DBG_CNT("before DEC-hung");
1940 #ifdef SERIAL_DEBUG_OPEN
1941 printk("rs_close ttys%d, count = %d\n", info
->line
, info
->count
);
1943 if ((tty
->count
== 1) && (info
->count
!= 1)) {
1945 * Uh, oh. tty->count is 1, which means that the tty
1946 * structure will be freed. Info->count should always
1947 * be one in these conditions. If it's greater than
1948 * one, we've got real problems, since it means the
1949 * serial port won't be shutdown.
1951 printk("rs_close: bad serial port count; tty->count is 1, "
1952 "info->count is %d\n", info
->count
);
1955 if (--info
->count
< 0) {
1956 printk("rs_close: bad serial port count for ttys%d: %d\n",
1957 info
->line
, info
->count
);
1961 DBG_CNT("before DEC-2");
1964 info
->flags
|= ASYNC_CLOSING
;
1966 spin_unlock_irqrestore(&info
->lock
, flags
);
1968 * Now we wait for the transmit buffer to clear; and we notify
1969 * the line discipline to only process XON/XOFF characters.
1972 if (info
->closing_wait
!= ASYNC_CLOSING_WAIT_NONE
)
1973 tty_wait_until_sent(tty
, info
->closing_wait
);
1975 * At this point we stop accepting input. To do this, we
1976 * disable the receive line status interrupts, and tell the
1977 * interrupt driver to stop checking the data ready bit in the
1978 * line status register.
1980 /* info->IER &= ~UART_IER_RLSI; */
1981 info
->IER
&= ~UART_IER_RDI
;
1982 info
->read_status_mask
&= ~UART_LSR_DR
;
1983 if (info
->flags
& ASYNC_INITIALIZED
) {
1985 spin_lock_irqsave(&info
->lock
, flags
);
1986 serial_out(info
, UART_ESI_CMD1
, ESI_SET_SRV_MASK
);
1987 serial_out(info
, UART_ESI_CMD2
, info
->IER
);
1989 /* disable receive timeout */
1990 serial_out(info
, UART_ESI_CMD1
, ESI_SET_RX_TIMEOUT
);
1991 serial_out(info
, UART_ESI_CMD2
, 0x00);
1993 spin_unlock_irqrestore(&info
->lock
, flags
);
1996 * Before we drop DTR, make sure the UART transmitter
1997 * has completely drained; this is especially
1998 * important if there is a transmit FIFO!
2000 rs_wait_until_sent(tty
, info
->timeout
);
2003 if (tty
->driver
->flush_buffer
)
2004 tty
->driver
->flush_buffer(tty
);
2005 tty_ldisc_flush(tty
);
2009 if (info
->blocked_open
) {
2010 if (info
->close_delay
) {
2011 msleep_interruptible(jiffies_to_msecs(info
->close_delay
));
2013 wake_up_interruptible(&info
->open_wait
);
2015 info
->flags
&= ~(ASYNC_NORMAL_ACTIVE
|ASYNC_CLOSING
);
2016 wake_up_interruptible(&info
->close_wait
);
2020 spin_unlock_irqrestore(&info
->lock
, flags
);
2023 static void rs_wait_until_sent(struct tty_struct
*tty
, int timeout
)
2025 struct esp_struct
*info
= (struct esp_struct
*)tty
->driver_data
;
2026 unsigned long orig_jiffies
, char_time
;
2027 unsigned long flags
;
2029 if (serial_paranoia_check(info
, tty
->name
, "rs_wait_until_sent"))
2032 orig_jiffies
= jiffies
;
2033 char_time
= ((info
->timeout
- HZ
/ 50) / 1024) / 5;
2038 spin_lock_irqsave(&info
->lock
, flags
);
2039 serial_out(info
, UART_ESI_CMD1
, ESI_NO_COMMAND
);
2040 serial_out(info
, UART_ESI_CMD1
, ESI_GET_TX_AVAIL
);
2042 while ((serial_in(info
, UART_ESI_STAT1
) != 0x03) ||
2043 (serial_in(info
, UART_ESI_STAT2
) != 0xff)) {
2045 spin_unlock_irqrestore(&info
->lock
, flags
);
2046 msleep_interruptible(jiffies_to_msecs(char_time
));
2048 if (signal_pending(current
))
2051 if (timeout
&& time_after(jiffies
, orig_jiffies
+ timeout
))
2054 spin_lock_irqsave(&info
->lock
, flags
);
2055 serial_out(info
, UART_ESI_CMD1
, ESI_NO_COMMAND
);
2056 serial_out(info
, UART_ESI_CMD1
, ESI_GET_TX_AVAIL
);
2058 spin_unlock_irqrestore(&info
->lock
, flags
);
2059 set_current_state(TASK_RUNNING
);
2063 * esp_hangup() --- called by tty_hangup() when a hangup is signaled.
2065 static void esp_hangup(struct tty_struct
*tty
)
2067 struct esp_struct
* info
= (struct esp_struct
*)tty
->driver_data
;
2069 if (serial_paranoia_check(info
, tty
->name
, "esp_hangup"))
2072 rs_flush_buffer(tty
);
2075 info
->flags
&= ~ASYNC_NORMAL_ACTIVE
;
2077 wake_up_interruptible(&info
->open_wait
);
2081 * ------------------------------------------------------------
2082 * esp_open() and friends
2083 * ------------------------------------------------------------
2085 static int block_til_ready(struct tty_struct
*tty
, struct file
* filp
,
2086 struct esp_struct
*info
)
2088 DECLARE_WAITQUEUE(wait
, current
);
2091 unsigned long flags
;
2094 * If the device is in the middle of being closed, then block
2095 * until it's done, and then try again.
2097 if (tty_hung_up_p(filp
) ||
2098 (info
->flags
& ASYNC_CLOSING
)) {
2099 if (info
->flags
& ASYNC_CLOSING
)
2100 interruptible_sleep_on(&info
->close_wait
);
2101 #ifdef SERIAL_DO_RESTART
2102 if (info
->flags
& ASYNC_HUP_NOTIFY
)
2105 return -ERESTARTSYS
;
2112 * If non-blocking mode is set, or the port is not enabled,
2113 * then make the check up front and then exit.
2115 if ((filp
->f_flags
& O_NONBLOCK
) ||
2116 (tty
->flags
& (1 << TTY_IO_ERROR
))) {
2117 info
->flags
|= ASYNC_NORMAL_ACTIVE
;
2121 if (tty
->termios
->c_cflag
& CLOCAL
)
2125 * Block waiting for the carrier detect and the line to become
2126 * free (i.e., not in use by the callout). While we are in
2127 * this loop, info->count is dropped by one, so that
2128 * rs_close() knows when to free things. We restore it upon
2129 * exit, either normal or abnormal.
2132 add_wait_queue(&info
->open_wait
, &wait
);
2133 #ifdef SERIAL_DEBUG_OPEN
2134 printk("block_til_ready before block: ttys%d, count = %d\n",
2135 info
->line
, info
->count
);
2137 spin_lock_irqsave(&info
->lock
, flags
);
2138 if (!tty_hung_up_p(filp
))
2140 info
->blocked_open
++;
2142 if ((tty
->termios
->c_cflag
& CBAUD
)) {
2143 unsigned int scratch
;
2145 serial_out(info
, UART_ESI_CMD1
, ESI_READ_UART
);
2146 serial_out(info
, UART_ESI_CMD2
, UART_MCR
);
2147 scratch
= serial_in(info
, UART_ESI_STAT1
);
2148 serial_out(info
, UART_ESI_CMD1
, ESI_WRITE_UART
);
2149 serial_out(info
, UART_ESI_CMD2
, UART_MCR
);
2150 serial_out(info
, UART_ESI_CMD2
,
2151 scratch
| UART_MCR_DTR
| UART_MCR_RTS
);
2153 set_current_state(TASK_INTERRUPTIBLE
);
2154 if (tty_hung_up_p(filp
) ||
2155 !(info
->flags
& ASYNC_INITIALIZED
)) {
2156 #ifdef SERIAL_DO_RESTART
2157 if (info
->flags
& ASYNC_HUP_NOTIFY
)
2160 retval
= -ERESTARTSYS
;
2167 serial_out(info
, UART_ESI_CMD1
, ESI_GET_UART_STAT
);
2168 if (serial_in(info
, UART_ESI_STAT2
) & UART_MSR_DCD
)
2171 if (!(info
->flags
& ASYNC_CLOSING
) &&
2174 if (signal_pending(current
)) {
2175 retval
= -ERESTARTSYS
;
2178 #ifdef SERIAL_DEBUG_OPEN
2179 printk("block_til_ready blocking: ttys%d, count = %d\n",
2180 info
->line
, info
->count
);
2182 spin_unlock_irqrestore(&info
->lock
, flags
);
2184 spin_lock_irqsave(&info
->lock
, flags
);
2186 set_current_state(TASK_RUNNING
);
2187 remove_wait_queue(&info
->open_wait
, &wait
);
2188 if (!tty_hung_up_p(filp
))
2190 info
->blocked_open
--;
2191 spin_unlock_irqrestore(&info
->lock
, flags
);
2192 #ifdef SERIAL_DEBUG_OPEN
2193 printk("block_til_ready after blocking: ttys%d, count = %d\n",
2194 info
->line
, info
->count
);
2198 info
->flags
|= ASYNC_NORMAL_ACTIVE
;
2203 * This routine is called whenever a serial port is opened. It
2204 * enables interrupts for a serial port, linking in its async structure into
2205 * the IRQ chain. It also performs the serial-specific
2206 * initialization for the tty structure.
2208 static int esp_open(struct tty_struct
*tty
, struct file
* filp
)
2210 struct esp_struct
*info
;
2212 unsigned long flags
;
2215 if ((line
< 0) || (line
>= NR_PORTS
))
2218 /* find the port in the chain */
2222 while (info
&& (info
->line
!= line
))
2223 info
= info
->next_port
;
2226 serial_paranoia_check(info
, tty
->name
, "esp_open");
2230 #ifdef SERIAL_DEBUG_OPEN
2231 printk("esp_open %s, count = %d\n", tty
->name
, info
->count
);
2233 spin_lock_irqsave(&info
->lock
, flags
);
2235 tty
->driver_data
= info
;
2238 spin_unlock_irqrestore(&info
->lock
, flags
);
2241 * Start up serial port
2243 retval
= startup(info
);
2247 retval
= block_til_ready(tty
, filp
, info
);
2249 #ifdef SERIAL_DEBUG_OPEN
2250 printk("esp_open returning after block_til_ready with %d\n",
2256 #ifdef SERIAL_DEBUG_OPEN
2257 printk("esp_open %s successful...", tty
->name
);
2263 * ---------------------------------------------------------------------
2264 * espserial_init() and friends
2266 * espserial_init() is called at boot-time to initialize the serial driver.
2267 * ---------------------------------------------------------------------
2271 * This routine prints out the appropriate serial driver version
2272 * number, and identifies which options were configured into this
2276 static inline void show_serial_version(void)
2278 printk(KERN_INFO
"%s version %s (DMA %u)\n",
2279 serial_name
, serial_version
, dma
);
2283 * This routine is called by espserial_init() to initialize a specific serial
2286 static inline int autoconfig(struct esp_struct
* info
)
2288 int port_detected
= 0;
2289 unsigned long flags
;
2291 if (!request_region(info
->port
, REGION_SIZE
, "esp serial"))
2294 spin_lock_irqsave(&info
->lock
, flags
);
2296 * Check for ESP card
2299 if (serial_in(info
, UART_ESI_BASE
) == 0xf3) {
2300 serial_out(info
, UART_ESI_CMD1
, 0x00);
2301 serial_out(info
, UART_ESI_CMD1
, 0x01);
2303 if ((serial_in(info
, UART_ESI_STAT2
) & 0x70) == 0x20) {
2307 serial_out(info
, UART_ESI_CMD1
, 0x02);
2309 if (serial_in(info
, UART_ESI_STAT1
) & 0x01)
2316 /* put card in enhanced mode */
2317 /* this prevents access through */
2318 /* the "old" IO ports */
2319 esp_basic_init(info
);
2322 serial_out(info
, UART_ESI_CMD1
, ESI_WRITE_UART
);
2323 serial_out(info
, UART_ESI_CMD2
, UART_MCR
);
2324 serial_out(info
, UART_ESI_CMD2
, 0x00);
2328 release_region(info
->port
, REGION_SIZE
);
2330 spin_unlock_irqrestore(&info
->lock
, flags
);
2331 return (port_detected
);
2334 static const struct tty_operations esp_ops
= {
2338 .put_char
= rs_put_char
,
2339 .flush_chars
= rs_flush_chars
,
2340 .write_room
= rs_write_room
,
2341 .chars_in_buffer
= rs_chars_in_buffer
,
2342 .flush_buffer
= rs_flush_buffer
,
2344 .throttle
= rs_throttle
,
2345 .unthrottle
= rs_unthrottle
,
2346 .set_termios
= rs_set_termios
,
2349 .hangup
= esp_hangup
,
2350 .break_ctl
= esp_break
,
2351 .wait_until_sent
= rs_wait_until_sent
,
2352 .tiocmget
= esp_tiocmget
,
2353 .tiocmset
= esp_tiocmset
,
2357 * The serial driver boot-time initialization code!
2359 static int __init
espserial_init(void)
2362 struct esp_struct
* info
;
2363 struct esp_struct
*last_primary
= NULL
;
2364 int esp
[] = {0x100,0x140,0x180,0x200,0x240,0x280,0x300,0x380};
2366 esp_driver
= alloc_tty_driver(NR_PORTS
);
2370 for (i
= 0; i
< NR_PRIMARY
; i
++) {
2372 if ((irq
[i
] < 2) || (irq
[i
] > 15) || (irq
[i
] == 6) ||
2373 (irq
[i
] == 8) || (irq
[i
] == 13))
2375 else if (irq
[i
] == 2)
2380 if ((dma
!= 1) && (dma
!= 3))
2383 if ((rx_trigger
< 1) || (rx_trigger
> 1023))
2386 if ((tx_trigger
< 1) || (tx_trigger
> 1023))
2389 if ((flow_off
< 1) || (flow_off
> 1023))
2392 if ((flow_on
< 1) || (flow_on
> 1023))
2395 if ((rx_timeout
< 0) || (rx_timeout
> 255))
2398 if (flow_on
>= flow_off
)
2399 flow_on
= flow_off
- 1;
2401 show_serial_version();
2403 /* Initialize the tty_driver structure */
2405 esp_driver
->owner
= THIS_MODULE
;
2406 esp_driver
->name
= "ttyP";
2407 esp_driver
->major
= ESP_IN_MAJOR
;
2408 esp_driver
->minor_start
= 0;
2409 esp_driver
->type
= TTY_DRIVER_TYPE_SERIAL
;
2410 esp_driver
->subtype
= SERIAL_TYPE_NORMAL
;
2411 esp_driver
->init_termios
= tty_std_termios
;
2412 esp_driver
->init_termios
.c_cflag
=
2413 B9600
| CS8
| CREAD
| HUPCL
| CLOCAL
;
2414 esp_driver
->flags
= TTY_DRIVER_REAL_RAW
;
2415 tty_set_operations(esp_driver
, &esp_ops
);
2416 if (tty_register_driver(esp_driver
))
2418 printk(KERN_ERR
"Couldn't register esp serial driver");
2419 put_tty_driver(esp_driver
);
2423 info
= kzalloc(sizeof(struct esp_struct
), GFP_KERNEL
);
2427 printk(KERN_ERR
"Couldn't allocate memory for esp serial device information\n");
2428 tty_unregister_driver(esp_driver
);
2429 put_tty_driver(esp_driver
);
2433 spin_lock_init(&info
->lock
);
2434 /* rx_trigger, tx_trigger are needed by autoconfig */
2435 info
->config
.rx_trigger
= rx_trigger
;
2436 info
->config
.tx_trigger
= tx_trigger
;
2442 info
->port
= esp
[i
] + offset
;
2444 info
->line
= (i
* 8) + (offset
/ 8);
2446 if (!autoconfig(info
)) {
2452 info
->custom_divisor
= (divisor
[i
] >> (offset
/ 2)) & 0xf;
2453 info
->flags
= STD_COM_FLAGS
;
2454 if (info
->custom_divisor
)
2455 info
->flags
|= ASYNC_SPD_CUST
;
2456 info
->magic
= ESP_MAGIC
;
2457 info
->close_delay
= 5*HZ
/10;
2458 info
->closing_wait
= 30*HZ
;
2459 info
->config
.rx_timeout
= rx_timeout
;
2460 info
->config
.flow_on
= flow_on
;
2461 info
->config
.flow_off
= flow_off
;
2462 info
->config
.pio_threshold
= pio_threshold
;
2463 info
->next_port
= ports
;
2464 init_waitqueue_head(&info
->open_wait
);
2465 init_waitqueue_head(&info
->close_wait
);
2466 init_waitqueue_head(&info
->delta_msr_wait
);
2467 init_waitqueue_head(&info
->break_wait
);
2469 printk(KERN_INFO
"ttyP%d at 0x%04x (irq = %d) is an ESP ",
2470 info
->line
, info
->port
, info
->irq
);
2472 if (info
->line
% 8) {
2473 printk("secondary port\n");
2474 /* 8 port cards can't do DMA */
2475 info
->stat_flags
|= ESP_STAT_NEVER_DMA
;
2478 last_primary
->stat_flags
|= ESP_STAT_NEVER_DMA
;
2480 printk("primary port\n");
2481 last_primary
= info
;
2486 info
->stat_flags
|= ESP_STAT_NEVER_DMA
;
2488 info
= kzalloc(sizeof(struct esp_struct
), GFP_KERNEL
);
2491 printk(KERN_ERR
"Couldn't allocate memory for esp serial device information\n");
2493 /* allow use of the already detected ports */
2497 spin_lock_init(&info
->lock
);
2498 /* rx_trigger, tx_trigger are needed by autoconfig */
2499 info
->config
.rx_trigger
= rx_trigger
;
2500 info
->config
.tx_trigger
= tx_trigger
;
2508 } while (i
< NR_PRIMARY
);
2510 /* free the last port memory allocation */
2516 static void __exit
espserial_exit(void)
2519 struct esp_struct
*temp_async
;
2520 struct esp_pio_buffer
*pio_buf
;
2522 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2523 if ((e1
= tty_unregister_driver(esp_driver
)))
2524 printk("SERIAL: failed to unregister serial driver (%d)\n",
2526 put_tty_driver(esp_driver
);
2530 release_region(ports
->port
, REGION_SIZE
);
2532 temp_async
= ports
->next_port
;
2538 free_pages((unsigned long)dma_buffer
,
2539 get_order(DMA_BUFFER_SZ
));
2541 while (free_pio_buf
) {
2542 pio_buf
= free_pio_buf
->next
;
2543 kfree(free_pio_buf
);
2544 free_pio_buf
= pio_buf
;
2548 module_init(espserial_init
);
2549 module_exit(espserial_exit
);