Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2004 Hollis Blanchard <hollisb@us.ibm.com>, IBM | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | */ | |
18 | ||
19 | /* Host Virtual Serial Interface (HVSI) is a protocol between the hosted OS | |
20 | * and the service processor on IBM pSeries servers. On these servers, there | |
21 | * are no serial ports under the OS's control, and sometimes there is no other | |
22 | * console available either. However, the service processor has two standard | |
23 | * serial ports, so this over-complicated protocol allows the OS to control | |
24 | * those ports by proxy. | |
25 | * | |
26 | * Besides data, the procotol supports the reading/writing of the serial | |
27 | * port's DTR line, and the reading of the CD line. This is to allow the OS to | |
28 | * control a modem attached to the service processor's serial port. Note that | |
29 | * the OS cannot change the speed of the port through this protocol. | |
30 | */ | |
31 | ||
32 | #undef DEBUG | |
33 | ||
34 | #include <linux/console.h> | |
35 | #include <linux/ctype.h> | |
36 | #include <linux/delay.h> | |
37 | #include <linux/init.h> | |
38 | #include <linux/interrupt.h> | |
39 | #include <linux/module.h> | |
40 | #include <linux/major.h> | |
41 | #include <linux/kernel.h> | |
1da177e4 LT |
42 | #include <linux/spinlock.h> |
43 | #include <linux/sysrq.h> | |
44 | #include <linux/tty.h> | |
45 | #include <linux/tty_flip.h> | |
46 | #include <asm/hvcall.h> | |
47 | #include <asm/hvconsole.h> | |
48 | #include <asm/prom.h> | |
49 | #include <asm/uaccess.h> | |
50 | #include <asm/vio.h> | |
51 | #include <asm/param.h> | |
725e789f | 52 | #include <asm/hvsi.h> |
1da177e4 LT |
53 | |
54 | #define HVSI_MAJOR 229 | |
55 | #define HVSI_MINOR 128 | |
56 | #define MAX_NR_HVSI_CONSOLES 4 | |
57 | ||
58 | #define HVSI_TIMEOUT (5*HZ) | |
59 | #define HVSI_VERSION 1 | |
60 | #define HVSI_MAX_PACKET 256 | |
61 | #define HVSI_MAX_READ 16 | |
62 | #define HVSI_MAX_OUTGOING_DATA 12 | |
63 | #define N_OUTBUF 12 | |
64 | ||
65 | /* | |
66 | * we pass data via two 8-byte registers, so we would like our char arrays | |
67 | * properly aligned for those loads. | |
68 | */ | |
69 | #define __ALIGNED__ __attribute__((__aligned__(sizeof(long)))) | |
70 | ||
71 | struct hvsi_struct { | |
c4028958 | 72 | struct delayed_work writer; |
1da177e4 LT |
73 | struct work_struct handshaker; |
74 | wait_queue_head_t emptyq; /* woken when outbuf is emptied */ | |
75 | wait_queue_head_t stateq; /* woken when HVSI state changes */ | |
76 | spinlock_t lock; | |
77 | int index; | |
78 | struct tty_struct *tty; | |
3d26825e | 79 | int count; |
1da177e4 LT |
80 | uint8_t throttle_buf[128]; |
81 | uint8_t outbuf[N_OUTBUF]; /* to implement write_room and chars_in_buffer */ | |
82 | /* inbuf is for packet reassembly. leave a little room for leftovers. */ | |
83 | uint8_t inbuf[HVSI_MAX_PACKET + HVSI_MAX_READ]; | |
84 | uint8_t *inbuf_end; | |
85 | int n_throttle; | |
86 | int n_outbuf; | |
87 | uint32_t vtermno; | |
88 | uint32_t virq; | |
89 | atomic_t seqno; /* HVSI packet sequence number */ | |
90 | uint16_t mctrl; | |
91 | uint8_t state; /* HVSI protocol state */ | |
92 | uint8_t flags; | |
93 | #ifdef CONFIG_MAGIC_SYSRQ | |
94 | uint8_t sysrq; | |
95 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
96 | }; | |
97 | static struct hvsi_struct hvsi_ports[MAX_NR_HVSI_CONSOLES]; | |
98 | ||
99 | static struct tty_driver *hvsi_driver; | |
100 | static int hvsi_count; | |
101 | static int (*hvsi_wait)(struct hvsi_struct *hp, int state); | |
102 | ||
103 | enum HVSI_PROTOCOL_STATE { | |
104 | HVSI_CLOSED, | |
105 | HVSI_WAIT_FOR_VER_RESPONSE, | |
106 | HVSI_WAIT_FOR_VER_QUERY, | |
107 | HVSI_OPEN, | |
108 | HVSI_WAIT_FOR_MCTRL_RESPONSE, | |
109 | HVSI_FSP_DIED, | |
110 | }; | |
111 | #define HVSI_CONSOLE 0x1 | |
112 | ||
1da177e4 LT |
113 | static inline int is_console(struct hvsi_struct *hp) |
114 | { | |
115 | return hp->flags & HVSI_CONSOLE; | |
116 | } | |
117 | ||
118 | static inline int is_open(struct hvsi_struct *hp) | |
119 | { | |
120 | /* if we're waiting for an mctrl then we're already open */ | |
121 | return (hp->state == HVSI_OPEN) | |
122 | || (hp->state == HVSI_WAIT_FOR_MCTRL_RESPONSE); | |
123 | } | |
124 | ||
125 | static inline void print_state(struct hvsi_struct *hp) | |
126 | { | |
127 | #ifdef DEBUG | |
128 | static const char *state_names[] = { | |
129 | "HVSI_CLOSED", | |
130 | "HVSI_WAIT_FOR_VER_RESPONSE", | |
131 | "HVSI_WAIT_FOR_VER_QUERY", | |
132 | "HVSI_OPEN", | |
133 | "HVSI_WAIT_FOR_MCTRL_RESPONSE", | |
134 | "HVSI_FSP_DIED", | |
135 | }; | |
08a82c68 PC |
136 | const char *name = (hp->state < ARRAY_SIZE(state_names)) |
137 | ? state_names[hp->state] : "UNKNOWN"; | |
1da177e4 LT |
138 | |
139 | pr_debug("hvsi%i: state = %s\n", hp->index, name); | |
140 | #endif /* DEBUG */ | |
141 | } | |
142 | ||
143 | static inline void __set_state(struct hvsi_struct *hp, int state) | |
144 | { | |
145 | hp->state = state; | |
146 | print_state(hp); | |
147 | wake_up_all(&hp->stateq); | |
148 | } | |
149 | ||
150 | static inline void set_state(struct hvsi_struct *hp, int state) | |
151 | { | |
152 | unsigned long flags; | |
153 | ||
154 | spin_lock_irqsave(&hp->lock, flags); | |
155 | __set_state(hp, state); | |
156 | spin_unlock_irqrestore(&hp->lock, flags); | |
157 | } | |
158 | ||
159 | static inline int len_packet(const uint8_t *packet) | |
160 | { | |
161 | return (int)((struct hvsi_header *)packet)->len; | |
162 | } | |
163 | ||
164 | static inline int is_header(const uint8_t *packet) | |
165 | { | |
166 | struct hvsi_header *header = (struct hvsi_header *)packet; | |
167 | return header->type >= VS_QUERY_RESPONSE_PACKET_HEADER; | |
168 | } | |
169 | ||
170 | static inline int got_packet(const struct hvsi_struct *hp, uint8_t *packet) | |
171 | { | |
172 | if (hp->inbuf_end < packet + sizeof(struct hvsi_header)) | |
173 | return 0; /* don't even have the packet header */ | |
174 | ||
175 | if (hp->inbuf_end < (packet + len_packet(packet))) | |
176 | return 0; /* don't have the rest of the packet */ | |
177 | ||
178 | return 1; | |
179 | } | |
180 | ||
181 | /* shift remaining bytes in packetbuf down */ | |
182 | static void compact_inbuf(struct hvsi_struct *hp, uint8_t *read_to) | |
183 | { | |
184 | int remaining = (int)(hp->inbuf_end - read_to); | |
185 | ||
bf9d8929 | 186 | pr_debug("%s: %i chars remain\n", __func__, remaining); |
1da177e4 LT |
187 | |
188 | if (read_to != hp->inbuf) | |
189 | memmove(hp->inbuf, read_to, remaining); | |
190 | ||
191 | hp->inbuf_end = hp->inbuf + remaining; | |
192 | } | |
193 | ||
194 | #ifdef DEBUG | |
195 | #define dbg_dump_packet(packet) dump_packet(packet) | |
196 | #define dbg_dump_hex(data, len) dump_hex(data, len) | |
197 | #else | |
198 | #define dbg_dump_packet(packet) do { } while (0) | |
199 | #define dbg_dump_hex(data, len) do { } while (0) | |
200 | #endif | |
201 | ||
202 | static void dump_hex(const uint8_t *data, int len) | |
203 | { | |
204 | int i; | |
205 | ||
206 | printk(" "); | |
207 | for (i=0; i < len; i++) | |
208 | printk("%.2x", data[i]); | |
209 | ||
210 | printk("\n "); | |
211 | for (i=0; i < len; i++) { | |
212 | if (isprint(data[i])) | |
213 | printk("%c", data[i]); | |
214 | else | |
215 | printk("."); | |
216 | } | |
217 | printk("\n"); | |
218 | } | |
219 | ||
220 | static void dump_packet(uint8_t *packet) | |
221 | { | |
222 | struct hvsi_header *header = (struct hvsi_header *)packet; | |
223 | ||
224 | printk("type 0x%x, len %i, seqno %i:\n", header->type, header->len, | |
225 | header->seqno); | |
226 | ||
227 | dump_hex(packet, header->len); | |
228 | } | |
229 | ||
1da177e4 LT |
230 | static int hvsi_read(struct hvsi_struct *hp, char *buf, int count) |
231 | { | |
232 | unsigned long got; | |
233 | ||
88de0be0 MM |
234 | got = hvc_get_chars(hp->vtermno, buf, count); |
235 | ||
236 | return got; | |
1da177e4 LT |
237 | } |
238 | ||
239 | static void hvsi_recv_control(struct hvsi_struct *hp, uint8_t *packet, | |
240 | struct tty_struct **to_hangup, struct hvsi_struct **to_handshake) | |
241 | { | |
242 | struct hvsi_control *header = (struct hvsi_control *)packet; | |
243 | ||
244 | switch (header->verb) { | |
245 | case VSV_MODEM_CTL_UPDATE: | |
246 | if ((header->word & HVSI_TSCD) == 0) { | |
247 | /* CD went away; no more connection */ | |
248 | pr_debug("hvsi%i: CD dropped\n", hp->index); | |
249 | hp->mctrl &= TIOCM_CD; | |
229395c9 LV |
250 | /* If userland hasn't done an open(2) yet, hp->tty is NULL. */ |
251 | if (hp->tty && !(hp->tty->flags & CLOCAL)) | |
1da177e4 LT |
252 | *to_hangup = hp->tty; |
253 | } | |
254 | break; | |
255 | case VSV_CLOSE_PROTOCOL: | |
256 | pr_debug("hvsi%i: service processor came back\n", hp->index); | |
257 | if (hp->state != HVSI_CLOSED) { | |
258 | *to_handshake = hp; | |
259 | } | |
260 | break; | |
261 | default: | |
262 | printk(KERN_WARNING "hvsi%i: unknown HVSI control packet: ", | |
263 | hp->index); | |
264 | dump_packet(packet); | |
265 | break; | |
266 | } | |
267 | } | |
268 | ||
269 | static void hvsi_recv_response(struct hvsi_struct *hp, uint8_t *packet) | |
270 | { | |
271 | struct hvsi_query_response *resp = (struct hvsi_query_response *)packet; | |
272 | ||
273 | switch (hp->state) { | |
274 | case HVSI_WAIT_FOR_VER_RESPONSE: | |
275 | __set_state(hp, HVSI_WAIT_FOR_VER_QUERY); | |
276 | break; | |
277 | case HVSI_WAIT_FOR_MCTRL_RESPONSE: | |
278 | hp->mctrl = 0; | |
279 | if (resp->u.mctrl_word & HVSI_TSDTR) | |
280 | hp->mctrl |= TIOCM_DTR; | |
281 | if (resp->u.mctrl_word & HVSI_TSCD) | |
282 | hp->mctrl |= TIOCM_CD; | |
283 | __set_state(hp, HVSI_OPEN); | |
284 | break; | |
285 | default: | |
286 | printk(KERN_ERR "hvsi%i: unexpected query response: ", hp->index); | |
287 | dump_packet(packet); | |
288 | break; | |
289 | } | |
290 | } | |
291 | ||
292 | /* respond to service processor's version query */ | |
293 | static int hvsi_version_respond(struct hvsi_struct *hp, uint16_t query_seqno) | |
294 | { | |
295 | struct hvsi_query_response packet __ALIGNED__; | |
296 | int wrote; | |
297 | ||
048bee77 BH |
298 | packet.hdr.type = VS_QUERY_RESPONSE_PACKET_HEADER; |
299 | packet.hdr.len = sizeof(struct hvsi_query_response); | |
300 | packet.hdr.seqno = atomic_inc_return(&hp->seqno); | |
1da177e4 LT |
301 | packet.verb = VSV_SEND_VERSION_NUMBER; |
302 | packet.u.version = HVSI_VERSION; | |
303 | packet.query_seqno = query_seqno+1; | |
304 | ||
048bee77 BH |
305 | pr_debug("%s: sending %i bytes\n", __func__, packet.hdr.len); |
306 | dbg_dump_hex((uint8_t*)&packet, packet.hdr.len); | |
1da177e4 | 307 | |
048bee77 BH |
308 | wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len); |
309 | if (wrote != packet.hdr.len) { | |
1da177e4 LT |
310 | printk(KERN_ERR "hvsi%i: couldn't send query response!\n", |
311 | hp->index); | |
312 | return -EIO; | |
313 | } | |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
318 | static void hvsi_recv_query(struct hvsi_struct *hp, uint8_t *packet) | |
319 | { | |
320 | struct hvsi_query *query = (struct hvsi_query *)packet; | |
321 | ||
322 | switch (hp->state) { | |
323 | case HVSI_WAIT_FOR_VER_QUERY: | |
048bee77 | 324 | hvsi_version_respond(hp, query->hdr.seqno); |
1da177e4 LT |
325 | __set_state(hp, HVSI_OPEN); |
326 | break; | |
327 | default: | |
328 | printk(KERN_ERR "hvsi%i: unexpected query: ", hp->index); | |
329 | dump_packet(packet); | |
330 | break; | |
331 | } | |
332 | } | |
333 | ||
334 | static void hvsi_insert_chars(struct hvsi_struct *hp, const char *buf, int len) | |
335 | { | |
336 | int i; | |
337 | ||
338 | for (i=0; i < len; i++) { | |
339 | char c = buf[i]; | |
340 | #ifdef CONFIG_MAGIC_SYSRQ | |
341 | if (c == '\0') { | |
342 | hp->sysrq = 1; | |
343 | continue; | |
344 | } else if (hp->sysrq) { | |
f335397d | 345 | handle_sysrq(c); |
1da177e4 LT |
346 | hp->sysrq = 0; |
347 | continue; | |
348 | } | |
349 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
350 | tty_insert_flip_char(hp->tty, c, 0); | |
351 | } | |
352 | } | |
353 | ||
354 | /* | |
355 | * We could get 252 bytes of data at once here. But the tty layer only | |
356 | * throttles us at TTY_THRESHOLD_THROTTLE (128) bytes, so we could overflow | |
357 | * it. Accordingly we won't send more than 128 bytes at a time to the flip | |
358 | * buffer, which will give the tty buffer a chance to throttle us. Should the | |
359 | * value of TTY_THRESHOLD_THROTTLE change in n_tty.c, this code should be | |
360 | * revisited. | |
361 | */ | |
362 | #define TTY_THRESHOLD_THROTTLE 128 | |
363 | static struct tty_struct *hvsi_recv_data(struct hvsi_struct *hp, | |
364 | const uint8_t *packet) | |
365 | { | |
366 | const struct hvsi_header *header = (const struct hvsi_header *)packet; | |
367 | const uint8_t *data = packet + sizeof(struct hvsi_header); | |
368 | int datalen = header->len - sizeof(struct hvsi_header); | |
369 | int overflow = datalen - TTY_THRESHOLD_THROTTLE; | |
370 | ||
371 | pr_debug("queueing %i chars '%.*s'\n", datalen, datalen, data); | |
372 | ||
373 | if (datalen == 0) | |
374 | return NULL; | |
375 | ||
376 | if (overflow > 0) { | |
bf9d8929 | 377 | pr_debug("%s: got >TTY_THRESHOLD_THROTTLE bytes\n", __func__); |
1da177e4 LT |
378 | datalen = TTY_THRESHOLD_THROTTLE; |
379 | } | |
380 | ||
381 | hvsi_insert_chars(hp, data, datalen); | |
382 | ||
383 | if (overflow > 0) { | |
384 | /* | |
385 | * we still have more data to deliver, so we need to save off the | |
386 | * overflow and send it later | |
387 | */ | |
bf9d8929 | 388 | pr_debug("%s: deferring overflow\n", __func__); |
1da177e4 LT |
389 | memcpy(hp->throttle_buf, data + TTY_THRESHOLD_THROTTLE, overflow); |
390 | hp->n_throttle = overflow; | |
391 | } | |
392 | ||
393 | return hp->tty; | |
394 | } | |
395 | ||
396 | /* | |
397 | * Returns true/false indicating data successfully read from hypervisor. | |
398 | * Used both to get packets for tty connections and to advance the state | |
399 | * machine during console handshaking (in which case tty = NULL and we ignore | |
400 | * incoming data). | |
401 | */ | |
402 | static int hvsi_load_chunk(struct hvsi_struct *hp, struct tty_struct **flip, | |
403 | struct tty_struct **hangup, struct hvsi_struct **handshake) | |
404 | { | |
405 | uint8_t *packet = hp->inbuf; | |
406 | int chunklen; | |
407 | ||
408 | *flip = NULL; | |
409 | *hangup = NULL; | |
410 | *handshake = NULL; | |
411 | ||
412 | chunklen = hvsi_read(hp, hp->inbuf_end, HVSI_MAX_READ); | |
413 | if (chunklen == 0) { | |
bf9d8929 | 414 | pr_debug("%s: 0-length read\n", __func__); |
1da177e4 LT |
415 | return 0; |
416 | } | |
417 | ||
bf9d8929 | 418 | pr_debug("%s: got %i bytes\n", __func__, chunklen); |
1da177e4 LT |
419 | dbg_dump_hex(hp->inbuf_end, chunklen); |
420 | ||
421 | hp->inbuf_end += chunklen; | |
422 | ||
423 | /* handle all completed packets */ | |
424 | while ((packet < hp->inbuf_end) && got_packet(hp, packet)) { | |
425 | struct hvsi_header *header = (struct hvsi_header *)packet; | |
426 | ||
427 | if (!is_header(packet)) { | |
428 | printk(KERN_ERR "hvsi%i: got malformed packet\n", hp->index); | |
429 | /* skip bytes until we find a header or run out of data */ | |
430 | while ((packet < hp->inbuf_end) && (!is_header(packet))) | |
431 | packet++; | |
432 | continue; | |
433 | } | |
434 | ||
bf9d8929 | 435 | pr_debug("%s: handling %i-byte packet\n", __func__, |
1da177e4 LT |
436 | len_packet(packet)); |
437 | dbg_dump_packet(packet); | |
438 | ||
439 | switch (header->type) { | |
440 | case VS_DATA_PACKET_HEADER: | |
441 | if (!is_open(hp)) | |
442 | break; | |
443 | if (hp->tty == NULL) | |
444 | break; /* no tty buffer to put data in */ | |
445 | *flip = hvsi_recv_data(hp, packet); | |
446 | break; | |
447 | case VS_CONTROL_PACKET_HEADER: | |
448 | hvsi_recv_control(hp, packet, hangup, handshake); | |
449 | break; | |
450 | case VS_QUERY_RESPONSE_PACKET_HEADER: | |
451 | hvsi_recv_response(hp, packet); | |
452 | break; | |
453 | case VS_QUERY_PACKET_HEADER: | |
454 | hvsi_recv_query(hp, packet); | |
455 | break; | |
456 | default: | |
457 | printk(KERN_ERR "hvsi%i: unknown HVSI packet type 0x%x\n", | |
458 | hp->index, header->type); | |
459 | dump_packet(packet); | |
460 | break; | |
461 | } | |
462 | ||
463 | packet += len_packet(packet); | |
464 | ||
465 | if (*hangup || *handshake) { | |
bf9d8929 | 466 | pr_debug("%s: hangup or handshake\n", __func__); |
1da177e4 LT |
467 | /* |
468 | * we need to send the hangup now before receiving any more data. | |
469 | * If we get "data, hangup, data", we can't deliver the second | |
470 | * data before the hangup. | |
471 | */ | |
472 | break; | |
473 | } | |
474 | } | |
475 | ||
476 | compact_inbuf(hp, packet); | |
477 | ||
478 | return 1; | |
479 | } | |
480 | ||
481 | static void hvsi_send_overflow(struct hvsi_struct *hp) | |
482 | { | |
bf9d8929 | 483 | pr_debug("%s: delivering %i bytes overflow\n", __func__, |
1da177e4 LT |
484 | hp->n_throttle); |
485 | ||
486 | hvsi_insert_chars(hp, hp->throttle_buf, hp->n_throttle); | |
487 | hp->n_throttle = 0; | |
488 | } | |
489 | ||
490 | /* | |
491 | * must get all pending data because we only get an irq on empty->non-empty | |
492 | * transition | |
493 | */ | |
7d12e780 | 494 | static irqreturn_t hvsi_interrupt(int irq, void *arg) |
1da177e4 LT |
495 | { |
496 | struct hvsi_struct *hp = (struct hvsi_struct *)arg; | |
497 | struct tty_struct *flip; | |
498 | struct tty_struct *hangup; | |
499 | struct hvsi_struct *handshake; | |
500 | unsigned long flags; | |
501 | int again = 1; | |
502 | ||
bf9d8929 | 503 | pr_debug("%s\n", __func__); |
1da177e4 LT |
504 | |
505 | while (again) { | |
506 | spin_lock_irqsave(&hp->lock, flags); | |
507 | again = hvsi_load_chunk(hp, &flip, &hangup, &handshake); | |
508 | spin_unlock_irqrestore(&hp->lock, flags); | |
509 | ||
510 | /* | |
511 | * we have to call tty_flip_buffer_push() and tty_hangup() outside our | |
512 | * spinlock. But we also have to keep going until we've read all the | |
513 | * available data. | |
514 | */ | |
515 | ||
516 | if (flip) { | |
517 | /* there was data put in the tty flip buffer */ | |
518 | tty_flip_buffer_push(flip); | |
519 | flip = NULL; | |
520 | } | |
521 | ||
522 | if (hangup) { | |
523 | tty_hangup(hangup); | |
524 | } | |
525 | ||
526 | if (handshake) { | |
527 | pr_debug("hvsi%i: attempting re-handshake\n", handshake->index); | |
528 | schedule_work(&handshake->handshaker); | |
529 | } | |
530 | } | |
531 | ||
532 | spin_lock_irqsave(&hp->lock, flags); | |
533 | if (hp->tty && hp->n_throttle | |
534 | && (!test_bit(TTY_THROTTLED, &hp->tty->flags))) { | |
535 | /* we weren't hung up and we weren't throttled, so we can deliver the | |
536 | * rest now */ | |
537 | flip = hp->tty; | |
538 | hvsi_send_overflow(hp); | |
539 | } | |
540 | spin_unlock_irqrestore(&hp->lock, flags); | |
541 | ||
542 | if (flip) { | |
543 | tty_flip_buffer_push(flip); | |
544 | } | |
545 | ||
546 | return IRQ_HANDLED; | |
547 | } | |
548 | ||
549 | /* for boot console, before the irq handler is running */ | |
550 | static int __init poll_for_state(struct hvsi_struct *hp, int state) | |
551 | { | |
552 | unsigned long end_jiffies = jiffies + HVSI_TIMEOUT; | |
553 | ||
554 | for (;;) { | |
7d12e780 | 555 | hvsi_interrupt(hp->virq, (void *)hp); /* get pending data */ |
1da177e4 LT |
556 | |
557 | if (hp->state == state) | |
558 | return 0; | |
559 | ||
560 | mdelay(5); | |
561 | if (time_after(jiffies, end_jiffies)) | |
562 | return -EIO; | |
563 | } | |
564 | } | |
565 | ||
566 | /* wait for irq handler to change our state */ | |
567 | static int wait_for_state(struct hvsi_struct *hp, int state) | |
568 | { | |
569 | int ret = 0; | |
570 | ||
571 | if (!wait_event_timeout(hp->stateq, (hp->state == state), HVSI_TIMEOUT)) | |
572 | ret = -EIO; | |
573 | ||
574 | return ret; | |
575 | } | |
576 | ||
577 | static int hvsi_query(struct hvsi_struct *hp, uint16_t verb) | |
578 | { | |
579 | struct hvsi_query packet __ALIGNED__; | |
580 | int wrote; | |
581 | ||
048bee77 BH |
582 | packet.hdr.type = VS_QUERY_PACKET_HEADER; |
583 | packet.hdr.len = sizeof(struct hvsi_query); | |
584 | packet.hdr.seqno = atomic_inc_return(&hp->seqno); | |
1da177e4 LT |
585 | packet.verb = verb; |
586 | ||
048bee77 BH |
587 | pr_debug("%s: sending %i bytes\n", __func__, packet.hdr.len); |
588 | dbg_dump_hex((uint8_t*)&packet, packet.hdr.len); | |
1da177e4 | 589 | |
048bee77 BH |
590 | wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len); |
591 | if (wrote != packet.hdr.len) { | |
1da177e4 LT |
592 | printk(KERN_ERR "hvsi%i: couldn't send query (%i)!\n", hp->index, |
593 | wrote); | |
594 | return -EIO; | |
595 | } | |
596 | ||
597 | return 0; | |
598 | } | |
599 | ||
600 | static int hvsi_get_mctrl(struct hvsi_struct *hp) | |
601 | { | |
602 | int ret; | |
603 | ||
604 | set_state(hp, HVSI_WAIT_FOR_MCTRL_RESPONSE); | |
605 | hvsi_query(hp, VSV_SEND_MODEM_CTL_STATUS); | |
606 | ||
607 | ret = hvsi_wait(hp, HVSI_OPEN); | |
608 | if (ret < 0) { | |
609 | printk(KERN_ERR "hvsi%i: didn't get modem flags\n", hp->index); | |
610 | set_state(hp, HVSI_OPEN); | |
611 | return ret; | |
612 | } | |
613 | ||
bf9d8929 | 614 | pr_debug("%s: mctrl 0x%x\n", __func__, hp->mctrl); |
1da177e4 LT |
615 | |
616 | return 0; | |
617 | } | |
618 | ||
619 | /* note that we can only set DTR */ | |
620 | static int hvsi_set_mctrl(struct hvsi_struct *hp, uint16_t mctrl) | |
621 | { | |
622 | struct hvsi_control packet __ALIGNED__; | |
623 | int wrote; | |
624 | ||
048bee77 BH |
625 | packet.hdr.type = VS_CONTROL_PACKET_HEADER, |
626 | packet.hdr.seqno = atomic_inc_return(&hp->seqno); | |
627 | packet.hdr.len = sizeof(struct hvsi_control); | |
1da177e4 LT |
628 | packet.verb = VSV_SET_MODEM_CTL; |
629 | packet.mask = HVSI_TSDTR; | |
630 | ||
631 | if (mctrl & TIOCM_DTR) | |
632 | packet.word = HVSI_TSDTR; | |
633 | ||
048bee77 BH |
634 | pr_debug("%s: sending %i bytes\n", __func__, packet.hdr.len); |
635 | dbg_dump_hex((uint8_t*)&packet, packet.hdr.len); | |
1da177e4 | 636 | |
048bee77 BH |
637 | wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len); |
638 | if (wrote != packet.hdr.len) { | |
1da177e4 LT |
639 | printk(KERN_ERR "hvsi%i: couldn't set DTR!\n", hp->index); |
640 | return -EIO; | |
641 | } | |
642 | ||
643 | return 0; | |
644 | } | |
645 | ||
646 | static void hvsi_drain_input(struct hvsi_struct *hp) | |
647 | { | |
648 | uint8_t buf[HVSI_MAX_READ] __ALIGNED__; | |
649 | unsigned long end_jiffies = jiffies + HVSI_TIMEOUT; | |
650 | ||
651 | while (time_before(end_jiffies, jiffies)) | |
652 | if (0 == hvsi_read(hp, buf, HVSI_MAX_READ)) | |
653 | break; | |
654 | } | |
655 | ||
656 | static int hvsi_handshake(struct hvsi_struct *hp) | |
657 | { | |
658 | int ret; | |
659 | ||
660 | /* | |
661 | * We could have a CLOSE or other data waiting for us before we even try | |
662 | * to open; try to throw it all away so we don't get confused. (CLOSE | |
663 | * is the first message sent up the pipe when the FSP comes online. We | |
664 | * need to distinguish between "it came up a while ago and we're the first | |
665 | * user" and "it was just reset before it saw our handshake packet".) | |
666 | */ | |
667 | hvsi_drain_input(hp); | |
668 | ||
669 | set_state(hp, HVSI_WAIT_FOR_VER_RESPONSE); | |
670 | ret = hvsi_query(hp, VSV_SEND_VERSION_NUMBER); | |
671 | if (ret < 0) { | |
672 | printk(KERN_ERR "hvsi%i: couldn't send version query\n", hp->index); | |
673 | return ret; | |
674 | } | |
675 | ||
676 | ret = hvsi_wait(hp, HVSI_OPEN); | |
677 | if (ret < 0) | |
678 | return ret; | |
679 | ||
680 | return 0; | |
681 | } | |
682 | ||
c4028958 | 683 | static void hvsi_handshaker(struct work_struct *work) |
1da177e4 | 684 | { |
c4028958 DH |
685 | struct hvsi_struct *hp = |
686 | container_of(work, struct hvsi_struct, handshaker); | |
1da177e4 LT |
687 | |
688 | if (hvsi_handshake(hp) >= 0) | |
689 | return; | |
690 | ||
691 | printk(KERN_ERR "hvsi%i: re-handshaking failed\n", hp->index); | |
692 | if (is_console(hp)) { | |
693 | /* | |
694 | * ttys will re-attempt the handshake via hvsi_open, but | |
695 | * the console will not. | |
696 | */ | |
697 | printk(KERN_ERR "hvsi%i: lost console!\n", hp->index); | |
698 | } | |
699 | } | |
700 | ||
701 | static int hvsi_put_chars(struct hvsi_struct *hp, const char *buf, int count) | |
702 | { | |
703 | struct hvsi_data packet __ALIGNED__; | |
704 | int ret; | |
705 | ||
706 | BUG_ON(count > HVSI_MAX_OUTGOING_DATA); | |
707 | ||
048bee77 BH |
708 | packet.hdr.type = VS_DATA_PACKET_HEADER; |
709 | packet.hdr.seqno = atomic_inc_return(&hp->seqno); | |
710 | packet.hdr.len = count + sizeof(struct hvsi_header); | |
1da177e4 LT |
711 | memcpy(&packet.data, buf, count); |
712 | ||
048bee77 BH |
713 | ret = hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len); |
714 | if (ret == packet.hdr.len) { | |
1da177e4 LT |
715 | /* return the number of chars written, not the packet length */ |
716 | return count; | |
717 | } | |
718 | return ret; /* return any errors */ | |
719 | } | |
720 | ||
721 | static void hvsi_close_protocol(struct hvsi_struct *hp) | |
722 | { | |
723 | struct hvsi_control packet __ALIGNED__; | |
724 | ||
048bee77 BH |
725 | packet.hdr.type = VS_CONTROL_PACKET_HEADER; |
726 | packet.hdr.seqno = atomic_inc_return(&hp->seqno); | |
727 | packet.hdr.len = 6; | |
1da177e4 LT |
728 | packet.verb = VSV_CLOSE_PROTOCOL; |
729 | ||
048bee77 BH |
730 | pr_debug("%s: sending %i bytes\n", __func__, packet.hdr.len); |
731 | dbg_dump_hex((uint8_t*)&packet, packet.hdr.len); | |
1da177e4 | 732 | |
048bee77 | 733 | hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len); |
1da177e4 LT |
734 | } |
735 | ||
736 | static int hvsi_open(struct tty_struct *tty, struct file *filp) | |
737 | { | |
738 | struct hvsi_struct *hp; | |
739 | unsigned long flags; | |
740 | int line = tty->index; | |
741 | int ret; | |
742 | ||
bf9d8929 | 743 | pr_debug("%s\n", __func__); |
1da177e4 LT |
744 | |
745 | if (line < 0 || line >= hvsi_count) | |
746 | return -ENODEV; | |
747 | hp = &hvsi_ports[line]; | |
748 | ||
749 | tty->driver_data = hp; | |
1da177e4 LT |
750 | |
751 | mb(); | |
752 | if (hp->state == HVSI_FSP_DIED) | |
753 | return -EIO; | |
754 | ||
755 | spin_lock_irqsave(&hp->lock, flags); | |
756 | hp->tty = tty; | |
757 | hp->count++; | |
758 | atomic_set(&hp->seqno, 0); | |
759 | h_vio_signal(hp->vtermno, VIO_IRQ_ENABLE); | |
760 | spin_unlock_irqrestore(&hp->lock, flags); | |
761 | ||
762 | if (is_console(hp)) | |
763 | return 0; /* this has already been handshaked as the console */ | |
764 | ||
765 | ret = hvsi_handshake(hp); | |
766 | if (ret < 0) { | |
767 | printk(KERN_ERR "%s: HVSI handshaking failed\n", tty->name); | |
768 | return ret; | |
769 | } | |
770 | ||
771 | ret = hvsi_get_mctrl(hp); | |
772 | if (ret < 0) { | |
773 | printk(KERN_ERR "%s: couldn't get initial modem flags\n", tty->name); | |
774 | return ret; | |
775 | } | |
776 | ||
777 | ret = hvsi_set_mctrl(hp, hp->mctrl | TIOCM_DTR); | |
778 | if (ret < 0) { | |
779 | printk(KERN_ERR "%s: couldn't set DTR\n", tty->name); | |
780 | return ret; | |
781 | } | |
782 | ||
783 | return 0; | |
784 | } | |
785 | ||
786 | /* wait for hvsi_write_worker to empty hp->outbuf */ | |
787 | static void hvsi_flush_output(struct hvsi_struct *hp) | |
788 | { | |
789 | wait_event_timeout(hp->emptyq, (hp->n_outbuf <= 0), HVSI_TIMEOUT); | |
790 | ||
791 | /* 'writer' could still be pending if it didn't see n_outbuf = 0 yet */ | |
42565999 TH |
792 | cancel_delayed_work_sync(&hp->writer); |
793 | flush_work_sync(&hp->handshaker); | |
1da177e4 LT |
794 | |
795 | /* | |
796 | * it's also possible that our timeout expired and hvsi_write_worker | |
797 | * didn't manage to push outbuf. poof. | |
798 | */ | |
799 | hp->n_outbuf = 0; | |
800 | } | |
801 | ||
802 | static void hvsi_close(struct tty_struct *tty, struct file *filp) | |
803 | { | |
804 | struct hvsi_struct *hp = tty->driver_data; | |
805 | unsigned long flags; | |
806 | ||
bf9d8929 | 807 | pr_debug("%s\n", __func__); |
1da177e4 LT |
808 | |
809 | if (tty_hung_up_p(filp)) | |
810 | return; | |
811 | ||
812 | spin_lock_irqsave(&hp->lock, flags); | |
813 | ||
814 | if (--hp->count == 0) { | |
815 | hp->tty = NULL; | |
816 | hp->inbuf_end = hp->inbuf; /* discard remaining partial packets */ | |
817 | ||
818 | /* only close down connection if it is not the console */ | |
819 | if (!is_console(hp)) { | |
820 | h_vio_signal(hp->vtermno, VIO_IRQ_DISABLE); /* no more irqs */ | |
821 | __set_state(hp, HVSI_CLOSED); | |
822 | /* | |
823 | * any data delivered to the tty layer after this will be | |
824 | * discarded (except for XON/XOFF) | |
825 | */ | |
826 | tty->closing = 1; | |
827 | ||
828 | spin_unlock_irqrestore(&hp->lock, flags); | |
829 | ||
830 | /* let any existing irq handlers finish. no more will start. */ | |
831 | synchronize_irq(hp->virq); | |
832 | ||
833 | /* hvsi_write_worker will re-schedule until outbuf is empty. */ | |
834 | hvsi_flush_output(hp); | |
835 | ||
836 | /* tell FSP to stop sending data */ | |
837 | hvsi_close_protocol(hp); | |
838 | ||
839 | /* | |
840 | * drain anything FSP is still in the middle of sending, and let | |
841 | * hvsi_handshake drain the rest on the next open. | |
842 | */ | |
843 | hvsi_drain_input(hp); | |
844 | ||
845 | spin_lock_irqsave(&hp->lock, flags); | |
846 | } | |
847 | } else if (hp->count < 0) | |
848 | printk(KERN_ERR "hvsi_close %lu: oops, count is %d\n", | |
849 | hp - hvsi_ports, hp->count); | |
850 | ||
851 | spin_unlock_irqrestore(&hp->lock, flags); | |
852 | } | |
853 | ||
854 | static void hvsi_hangup(struct tty_struct *tty) | |
855 | { | |
856 | struct hvsi_struct *hp = tty->driver_data; | |
857 | unsigned long flags; | |
858 | ||
bf9d8929 | 859 | pr_debug("%s\n", __func__); |
1da177e4 LT |
860 | |
861 | spin_lock_irqsave(&hp->lock, flags); | |
862 | ||
863 | hp->count = 0; | |
864 | hp->n_outbuf = 0; | |
865 | hp->tty = NULL; | |
866 | ||
867 | spin_unlock_irqrestore(&hp->lock, flags); | |
868 | } | |
869 | ||
870 | /* called with hp->lock held */ | |
871 | static void hvsi_push(struct hvsi_struct *hp) | |
872 | { | |
873 | int n; | |
874 | ||
875 | if (hp->n_outbuf <= 0) | |
876 | return; | |
877 | ||
878 | n = hvsi_put_chars(hp, hp->outbuf, hp->n_outbuf); | |
879 | if (n > 0) { | |
880 | /* success */ | |
bf9d8929 | 881 | pr_debug("%s: wrote %i chars\n", __func__, n); |
1da177e4 LT |
882 | hp->n_outbuf = 0; |
883 | } else if (n == -EIO) { | |
884 | __set_state(hp, HVSI_FSP_DIED); | |
885 | printk(KERN_ERR "hvsi%i: service processor died\n", hp->index); | |
886 | } | |
887 | } | |
888 | ||
889 | /* hvsi_write_worker will keep rescheduling itself until outbuf is empty */ | |
c4028958 | 890 | static void hvsi_write_worker(struct work_struct *work) |
1da177e4 | 891 | { |
c4028958 DH |
892 | struct hvsi_struct *hp = |
893 | container_of(work, struct hvsi_struct, writer.work); | |
1da177e4 LT |
894 | unsigned long flags; |
895 | #ifdef DEBUG | |
896 | static long start_j = 0; | |
897 | ||
898 | if (start_j == 0) | |
899 | start_j = jiffies; | |
900 | #endif /* DEBUG */ | |
901 | ||
902 | spin_lock_irqsave(&hp->lock, flags); | |
903 | ||
bf9d8929 | 904 | pr_debug("%s: %i chars in buffer\n", __func__, hp->n_outbuf); |
1da177e4 LT |
905 | |
906 | if (!is_open(hp)) { | |
907 | /* | |
908 | * We could have a non-open connection if the service processor died | |
909 | * while we were busily scheduling ourselves. In that case, it could | |
910 | * be minutes before the service processor comes back, so only try | |
911 | * again once a second. | |
912 | */ | |
913 | schedule_delayed_work(&hp->writer, HZ); | |
914 | goto out; | |
915 | } | |
916 | ||
917 | hvsi_push(hp); | |
918 | if (hp->n_outbuf > 0) | |
919 | schedule_delayed_work(&hp->writer, 10); | |
920 | else { | |
921 | #ifdef DEBUG | |
bf9d8929 | 922 | pr_debug("%s: outbuf emptied after %li jiffies\n", __func__, |
1da177e4 LT |
923 | jiffies - start_j); |
924 | start_j = 0; | |
925 | #endif /* DEBUG */ | |
926 | wake_up_all(&hp->emptyq); | |
64e0cc38 | 927 | tty_wakeup(hp->tty); |
1da177e4 LT |
928 | } |
929 | ||
930 | out: | |
931 | spin_unlock_irqrestore(&hp->lock, flags); | |
932 | } | |
933 | ||
934 | static int hvsi_write_room(struct tty_struct *tty) | |
935 | { | |
c9f19e96 | 936 | struct hvsi_struct *hp = tty->driver_data; |
1da177e4 LT |
937 | |
938 | return N_OUTBUF - hp->n_outbuf; | |
939 | } | |
940 | ||
941 | static int hvsi_chars_in_buffer(struct tty_struct *tty) | |
942 | { | |
c9f19e96 | 943 | struct hvsi_struct *hp = tty->driver_data; |
1da177e4 LT |
944 | |
945 | return hp->n_outbuf; | |
946 | } | |
947 | ||
948 | static int hvsi_write(struct tty_struct *tty, | |
949 | const unsigned char *buf, int count) | |
950 | { | |
951 | struct hvsi_struct *hp = tty->driver_data; | |
952 | const char *source = buf; | |
953 | unsigned long flags; | |
954 | int total = 0; | |
955 | int origcount = count; | |
956 | ||
957 | spin_lock_irqsave(&hp->lock, flags); | |
958 | ||
bf9d8929 | 959 | pr_debug("%s: %i chars in buffer\n", __func__, hp->n_outbuf); |
1da177e4 LT |
960 | |
961 | if (!is_open(hp)) { | |
962 | /* we're either closing or not yet open; don't accept data */ | |
bf9d8929 | 963 | pr_debug("%s: not open\n", __func__); |
1da177e4 LT |
964 | goto out; |
965 | } | |
966 | ||
967 | /* | |
968 | * when the hypervisor buffer (16K) fills, data will stay in hp->outbuf | |
969 | * and hvsi_write_worker will be scheduled. subsequent hvsi_write() calls | |
970 | * will see there is no room in outbuf and return. | |
971 | */ | |
972 | while ((count > 0) && (hvsi_write_room(hp->tty) > 0)) { | |
973 | int chunksize = min(count, hvsi_write_room(hp->tty)); | |
974 | ||
975 | BUG_ON(hp->n_outbuf < 0); | |
976 | memcpy(hp->outbuf + hp->n_outbuf, source, chunksize); | |
977 | hp->n_outbuf += chunksize; | |
978 | ||
979 | total += chunksize; | |
980 | source += chunksize; | |
981 | count -= chunksize; | |
982 | hvsi_push(hp); | |
983 | } | |
984 | ||
985 | if (hp->n_outbuf > 0) { | |
986 | /* | |
987 | * we weren't able to write it all to the hypervisor. | |
988 | * schedule another push attempt. | |
989 | */ | |
990 | schedule_delayed_work(&hp->writer, 10); | |
991 | } | |
992 | ||
993 | out: | |
994 | spin_unlock_irqrestore(&hp->lock, flags); | |
995 | ||
996 | if (total != origcount) | |
bf9d8929 | 997 | pr_debug("%s: wanted %i, only wrote %i\n", __func__, origcount, |
1da177e4 LT |
998 | total); |
999 | ||
1000 | return total; | |
1001 | } | |
1002 | ||
1003 | /* | |
1004 | * I have never seen throttle or unthrottle called, so this little throttle | |
1005 | * buffering scheme may or may not work. | |
1006 | */ | |
1007 | static void hvsi_throttle(struct tty_struct *tty) | |
1008 | { | |
c9f19e96 | 1009 | struct hvsi_struct *hp = tty->driver_data; |
1da177e4 | 1010 | |
bf9d8929 | 1011 | pr_debug("%s\n", __func__); |
1da177e4 LT |
1012 | |
1013 | h_vio_signal(hp->vtermno, VIO_IRQ_DISABLE); | |
1014 | } | |
1015 | ||
1016 | static void hvsi_unthrottle(struct tty_struct *tty) | |
1017 | { | |
c9f19e96 | 1018 | struct hvsi_struct *hp = tty->driver_data; |
1da177e4 LT |
1019 | unsigned long flags; |
1020 | int shouldflip = 0; | |
1021 | ||
bf9d8929 | 1022 | pr_debug("%s\n", __func__); |
1da177e4 LT |
1023 | |
1024 | spin_lock_irqsave(&hp->lock, flags); | |
1025 | if (hp->n_throttle) { | |
1026 | hvsi_send_overflow(hp); | |
1027 | shouldflip = 1; | |
1028 | } | |
1029 | spin_unlock_irqrestore(&hp->lock, flags); | |
1030 | ||
1031 | if (shouldflip) | |
1032 | tty_flip_buffer_push(hp->tty); | |
1033 | ||
1034 | h_vio_signal(hp->vtermno, VIO_IRQ_ENABLE); | |
1035 | } | |
1036 | ||
60b33c13 | 1037 | static int hvsi_tiocmget(struct tty_struct *tty) |
1da177e4 | 1038 | { |
c9f19e96 | 1039 | struct hvsi_struct *hp = tty->driver_data; |
1da177e4 LT |
1040 | |
1041 | hvsi_get_mctrl(hp); | |
1042 | return hp->mctrl; | |
1043 | } | |
1044 | ||
20b9d177 AC |
1045 | static int hvsi_tiocmset(struct tty_struct *tty, |
1046 | unsigned int set, unsigned int clear) | |
1da177e4 | 1047 | { |
c9f19e96 | 1048 | struct hvsi_struct *hp = tty->driver_data; |
1da177e4 LT |
1049 | unsigned long flags; |
1050 | uint16_t new_mctrl; | |
1051 | ||
1052 | /* we can only alter DTR */ | |
1053 | clear &= TIOCM_DTR; | |
1054 | set &= TIOCM_DTR; | |
1055 | ||
1056 | spin_lock_irqsave(&hp->lock, flags); | |
1057 | ||
1058 | new_mctrl = (hp->mctrl & ~clear) | set; | |
1059 | ||
1060 | if (hp->mctrl != new_mctrl) { | |
1061 | hvsi_set_mctrl(hp, new_mctrl); | |
1062 | hp->mctrl = new_mctrl; | |
1063 | } | |
1064 | spin_unlock_irqrestore(&hp->lock, flags); | |
1065 | ||
1066 | return 0; | |
1067 | } | |
1068 | ||
1069 | ||
b68e31d0 | 1070 | static const struct tty_operations hvsi_ops = { |
1da177e4 LT |
1071 | .open = hvsi_open, |
1072 | .close = hvsi_close, | |
1073 | .write = hvsi_write, | |
1074 | .hangup = hvsi_hangup, | |
1075 | .write_room = hvsi_write_room, | |
1076 | .chars_in_buffer = hvsi_chars_in_buffer, | |
1077 | .throttle = hvsi_throttle, | |
1078 | .unthrottle = hvsi_unthrottle, | |
1079 | .tiocmget = hvsi_tiocmget, | |
1080 | .tiocmset = hvsi_tiocmset, | |
1081 | }; | |
1082 | ||
1083 | static int __init hvsi_init(void) | |
1084 | { | |
1085 | int i; | |
1086 | ||
1087 | hvsi_driver = alloc_tty_driver(hvsi_count); | |
1088 | if (!hvsi_driver) | |
1089 | return -ENOMEM; | |
1090 | ||
1091 | hvsi_driver->owner = THIS_MODULE; | |
1da177e4 LT |
1092 | hvsi_driver->driver_name = "hvsi"; |
1093 | hvsi_driver->name = "hvsi"; | |
1094 | hvsi_driver->major = HVSI_MAJOR; | |
1095 | hvsi_driver->minor_start = HVSI_MINOR; | |
1096 | hvsi_driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
1097 | hvsi_driver->init_termios = tty_std_termios; | |
1098 | hvsi_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL; | |
606d099c AC |
1099 | hvsi_driver->init_termios.c_ispeed = 9600; |
1100 | hvsi_driver->init_termios.c_ospeed = 9600; | |
1da177e4 LT |
1101 | hvsi_driver->flags = TTY_DRIVER_REAL_RAW; |
1102 | tty_set_operations(hvsi_driver, &hvsi_ops); | |
1103 | ||
1104 | for (i=0; i < hvsi_count; i++) { | |
1105 | struct hvsi_struct *hp = &hvsi_ports[i]; | |
1106 | int ret = 1; | |
1107 | ||
9cfb5c05 | 1108 | ret = request_irq(hp->virq, hvsi_interrupt, 0, "hvsi", hp); |
1da177e4 LT |
1109 | if (ret) |
1110 | printk(KERN_ERR "HVSI: couldn't reserve irq 0x%x (error %i)\n", | |
1111 | hp->virq, ret); | |
1112 | } | |
1113 | hvsi_wait = wait_for_state; /* irqs active now */ | |
1114 | ||
1115 | if (tty_register_driver(hvsi_driver)) | |
1116 | panic("Couldn't register hvsi console driver\n"); | |
1117 | ||
8b6a7b2e | 1118 | printk(KERN_DEBUG "HVSI: registered %i devices\n", hvsi_count); |
1da177e4 LT |
1119 | |
1120 | return 0; | |
1121 | } | |
1122 | device_initcall(hvsi_init); | |
1123 | ||
1124 | /***** console (not tty) code: *****/ | |
1125 | ||
1126 | static void hvsi_console_print(struct console *console, const char *buf, | |
1127 | unsigned int count) | |
1128 | { | |
1129 | struct hvsi_struct *hp = &hvsi_ports[console->index]; | |
1130 | char c[HVSI_MAX_OUTGOING_DATA] __ALIGNED__; | |
1131 | unsigned int i = 0, n = 0; | |
1132 | int ret, donecr = 0; | |
1133 | ||
1134 | mb(); | |
1135 | if (!is_open(hp)) | |
1136 | return; | |
1137 | ||
1138 | /* | |
1139 | * ugh, we have to translate LF -> CRLF ourselves, in place. | |
1140 | * copied from hvc_console.c: | |
1141 | */ | |
1142 | while (count > 0 || i > 0) { | |
1143 | if (count > 0 && i < sizeof(c)) { | |
1144 | if (buf[n] == '\n' && !donecr) { | |
1145 | c[i++] = '\r'; | |
1146 | donecr = 1; | |
1147 | } else { | |
1148 | c[i++] = buf[n++]; | |
1149 | donecr = 0; | |
1150 | --count; | |
1151 | } | |
1152 | } else { | |
1153 | ret = hvsi_put_chars(hp, c, i); | |
1154 | if (ret < 0) | |
1155 | i = 0; | |
1156 | i -= ret; | |
1157 | } | |
1158 | } | |
1159 | } | |
1160 | ||
1161 | static struct tty_driver *hvsi_console_device(struct console *console, | |
1162 | int *index) | |
1163 | { | |
1164 | *index = console->index; | |
1165 | return hvsi_driver; | |
1166 | } | |
1167 | ||
1168 | static int __init hvsi_console_setup(struct console *console, char *options) | |
1169 | { | |
72865650 | 1170 | struct hvsi_struct *hp; |
1da177e4 LT |
1171 | int ret; |
1172 | ||
1173 | if (console->index < 0 || console->index >= hvsi_count) | |
1174 | return -1; | |
72865650 | 1175 | hp = &hvsi_ports[console->index]; |
1da177e4 LT |
1176 | |
1177 | /* give the FSP a chance to change the baud rate when we re-open */ | |
1178 | hvsi_close_protocol(hp); | |
1179 | ||
1180 | ret = hvsi_handshake(hp); | |
1181 | if (ret < 0) | |
1182 | return ret; | |
1183 | ||
1184 | ret = hvsi_get_mctrl(hp); | |
1185 | if (ret < 0) | |
1186 | return ret; | |
1187 | ||
1188 | ret = hvsi_set_mctrl(hp, hp->mctrl | TIOCM_DTR); | |
1189 | if (ret < 0) | |
1190 | return ret; | |
1191 | ||
1192 | hp->flags |= HVSI_CONSOLE; | |
1193 | ||
1194 | return 0; | |
1195 | } | |
1196 | ||
4455b119 | 1197 | static struct console hvsi_console = { |
1da177e4 LT |
1198 | .name = "hvsi", |
1199 | .write = hvsi_console_print, | |
1200 | .device = hvsi_console_device, | |
1201 | .setup = hvsi_console_setup, | |
1202 | .flags = CON_PRINTBUFFER, | |
1203 | .index = -1, | |
1204 | }; | |
1205 | ||
1206 | static int __init hvsi_console_init(void) | |
1207 | { | |
1208 | struct device_node *vty; | |
1209 | ||
1210 | hvsi_wait = poll_for_state; /* no irqs yet; must poll */ | |
1211 | ||
1212 | /* search device tree for vty nodes */ | |
1213 | for (vty = of_find_compatible_node(NULL, "serial", "hvterm-protocol"); | |
1214 | vty != NULL; | |
1215 | vty = of_find_compatible_node(vty, "serial", "hvterm-protocol")) { | |
1216 | struct hvsi_struct *hp; | |
954a46e2 | 1217 | const uint32_t *vtermno, *irq; |
1da177e4 | 1218 | |
01b2726d SR |
1219 | vtermno = of_get_property(vty, "reg", NULL); |
1220 | irq = of_get_property(vty, "interrupts", NULL); | |
1da177e4 LT |
1221 | if (!vtermno || !irq) |
1222 | continue; | |
1223 | ||
1224 | if (hvsi_count >= MAX_NR_HVSI_CONSOLES) { | |
1225 | of_node_put(vty); | |
1226 | break; | |
1227 | } | |
1228 | ||
1229 | hp = &hvsi_ports[hvsi_count]; | |
c4028958 DH |
1230 | INIT_DELAYED_WORK(&hp->writer, hvsi_write_worker); |
1231 | INIT_WORK(&hp->handshaker, hvsi_handshaker); | |
1da177e4 LT |
1232 | init_waitqueue_head(&hp->emptyq); |
1233 | init_waitqueue_head(&hp->stateq); | |
1234 | spin_lock_init(&hp->lock); | |
1235 | hp->index = hvsi_count; | |
1236 | hp->inbuf_end = hp->inbuf; | |
1237 | hp->state = HVSI_CLOSED; | |
1238 | hp->vtermno = *vtermno; | |
6e99e458 | 1239 | hp->virq = irq_create_mapping(NULL, irq[0]); |
1da177e4 LT |
1240 | if (hp->virq == NO_IRQ) { |
1241 | printk(KERN_ERR "%s: couldn't create irq mapping for 0x%x\n", | |
bf9d8929 | 1242 | __func__, irq[0]); |
1da177e4 | 1243 | continue; |
0ebfff14 | 1244 | } |
1da177e4 LT |
1245 | |
1246 | hvsi_count++; | |
1247 | } | |
1248 | ||
1249 | if (hvsi_count) | |
4455b119 | 1250 | register_console(&hvsi_console); |
1da177e4 LT |
1251 | return 0; |
1252 | } | |
1253 | console_initcall(hvsi_console_init); |