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 { | |
d73a4e79 | 72 | struct tty_port port; |
c4028958 | 73 | struct delayed_work writer; |
1da177e4 LT |
74 | struct work_struct handshaker; |
75 | wait_queue_head_t emptyq; /* woken when outbuf is emptied */ | |
76 | wait_queue_head_t stateq; /* woken when HVSI state changes */ | |
77 | spinlock_t lock; | |
78 | int index; | |
1da177e4 LT |
79 | uint8_t throttle_buf[128]; |
80 | uint8_t outbuf[N_OUTBUF]; /* to implement write_room and chars_in_buffer */ | |
81 | /* inbuf is for packet reassembly. leave a little room for leftovers. */ | |
82 | uint8_t inbuf[HVSI_MAX_PACKET + HVSI_MAX_READ]; | |
83 | uint8_t *inbuf_end; | |
84 | int n_throttle; | |
85 | int n_outbuf; | |
86 | uint32_t vtermno; | |
87 | uint32_t virq; | |
88 | atomic_t seqno; /* HVSI packet sequence number */ | |
89 | uint16_t mctrl; | |
90 | uint8_t state; /* HVSI protocol state */ | |
91 | uint8_t flags; | |
92 | #ifdef CONFIG_MAGIC_SYSRQ | |
93 | uint8_t sysrq; | |
94 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
95 | }; | |
96 | static struct hvsi_struct hvsi_ports[MAX_NR_HVSI_CONSOLES]; | |
97 | ||
98 | static struct tty_driver *hvsi_driver; | |
99 | static int hvsi_count; | |
100 | static int (*hvsi_wait)(struct hvsi_struct *hp, int state); | |
101 | ||
102 | enum HVSI_PROTOCOL_STATE { | |
103 | HVSI_CLOSED, | |
104 | HVSI_WAIT_FOR_VER_RESPONSE, | |
105 | HVSI_WAIT_FOR_VER_QUERY, | |
106 | HVSI_OPEN, | |
107 | HVSI_WAIT_FOR_MCTRL_RESPONSE, | |
108 | HVSI_FSP_DIED, | |
109 | }; | |
110 | #define HVSI_CONSOLE 0x1 | |
111 | ||
1da177e4 LT |
112 | static inline int is_console(struct hvsi_struct *hp) |
113 | { | |
114 | return hp->flags & HVSI_CONSOLE; | |
115 | } | |
116 | ||
117 | static inline int is_open(struct hvsi_struct *hp) | |
118 | { | |
119 | /* if we're waiting for an mctrl then we're already open */ | |
120 | return (hp->state == HVSI_OPEN) | |
121 | || (hp->state == HVSI_WAIT_FOR_MCTRL_RESPONSE); | |
122 | } | |
123 | ||
124 | static inline void print_state(struct hvsi_struct *hp) | |
125 | { | |
126 | #ifdef DEBUG | |
127 | static const char *state_names[] = { | |
128 | "HVSI_CLOSED", | |
129 | "HVSI_WAIT_FOR_VER_RESPONSE", | |
130 | "HVSI_WAIT_FOR_VER_QUERY", | |
131 | "HVSI_OPEN", | |
132 | "HVSI_WAIT_FOR_MCTRL_RESPONSE", | |
133 | "HVSI_FSP_DIED", | |
134 | }; | |
08a82c68 PC |
135 | const char *name = (hp->state < ARRAY_SIZE(state_names)) |
136 | ? state_names[hp->state] : "UNKNOWN"; | |
1da177e4 LT |
137 | |
138 | pr_debug("hvsi%i: state = %s\n", hp->index, name); | |
139 | #endif /* DEBUG */ | |
140 | } | |
141 | ||
142 | static inline void __set_state(struct hvsi_struct *hp, int state) | |
143 | { | |
144 | hp->state = state; | |
145 | print_state(hp); | |
146 | wake_up_all(&hp->stateq); | |
147 | } | |
148 | ||
149 | static inline void set_state(struct hvsi_struct *hp, int state) | |
150 | { | |
151 | unsigned long flags; | |
152 | ||
153 | spin_lock_irqsave(&hp->lock, flags); | |
154 | __set_state(hp, state); | |
155 | spin_unlock_irqrestore(&hp->lock, flags); | |
156 | } | |
157 | ||
158 | static inline int len_packet(const uint8_t *packet) | |
159 | { | |
160 | return (int)((struct hvsi_header *)packet)->len; | |
161 | } | |
162 | ||
163 | static inline int is_header(const uint8_t *packet) | |
164 | { | |
165 | struct hvsi_header *header = (struct hvsi_header *)packet; | |
166 | return header->type >= VS_QUERY_RESPONSE_PACKET_HEADER; | |
167 | } | |
168 | ||
169 | static inline int got_packet(const struct hvsi_struct *hp, uint8_t *packet) | |
170 | { | |
171 | if (hp->inbuf_end < packet + sizeof(struct hvsi_header)) | |
172 | return 0; /* don't even have the packet header */ | |
173 | ||
174 | if (hp->inbuf_end < (packet + len_packet(packet))) | |
175 | return 0; /* don't have the rest of the packet */ | |
176 | ||
177 | return 1; | |
178 | } | |
179 | ||
180 | /* shift remaining bytes in packetbuf down */ | |
181 | static void compact_inbuf(struct hvsi_struct *hp, uint8_t *read_to) | |
182 | { | |
183 | int remaining = (int)(hp->inbuf_end - read_to); | |
184 | ||
bf9d8929 | 185 | pr_debug("%s: %i chars remain\n", __func__, remaining); |
1da177e4 LT |
186 | |
187 | if (read_to != hp->inbuf) | |
188 | memmove(hp->inbuf, read_to, remaining); | |
189 | ||
190 | hp->inbuf_end = hp->inbuf + remaining; | |
191 | } | |
192 | ||
193 | #ifdef DEBUG | |
194 | #define dbg_dump_packet(packet) dump_packet(packet) | |
195 | #define dbg_dump_hex(data, len) dump_hex(data, len) | |
196 | #else | |
197 | #define dbg_dump_packet(packet) do { } while (0) | |
198 | #define dbg_dump_hex(data, len) do { } while (0) | |
199 | #endif | |
200 | ||
201 | static void dump_hex(const uint8_t *data, int len) | |
202 | { | |
203 | int i; | |
204 | ||
205 | printk(" "); | |
206 | for (i=0; i < len; i++) | |
207 | printk("%.2x", data[i]); | |
208 | ||
209 | printk("\n "); | |
210 | for (i=0; i < len; i++) { | |
211 | if (isprint(data[i])) | |
212 | printk("%c", data[i]); | |
213 | else | |
214 | printk("."); | |
215 | } | |
216 | printk("\n"); | |
217 | } | |
218 | ||
219 | static void dump_packet(uint8_t *packet) | |
220 | { | |
221 | struct hvsi_header *header = (struct hvsi_header *)packet; | |
222 | ||
223 | printk("type 0x%x, len %i, seqno %i:\n", header->type, header->len, | |
224 | header->seqno); | |
225 | ||
226 | dump_hex(packet, header->len); | |
227 | } | |
228 | ||
1da177e4 LT |
229 | static int hvsi_read(struct hvsi_struct *hp, char *buf, int count) |
230 | { | |
231 | unsigned long got; | |
232 | ||
88de0be0 MM |
233 | got = hvc_get_chars(hp->vtermno, buf, count); |
234 | ||
235 | return got; | |
1da177e4 LT |
236 | } |
237 | ||
238 | static void hvsi_recv_control(struct hvsi_struct *hp, uint8_t *packet, | |
28c0447d | 239 | struct tty_struct *tty, struct hvsi_struct **to_handshake) |
1da177e4 LT |
240 | { |
241 | struct hvsi_control *header = (struct hvsi_control *)packet; | |
242 | ||
243 | switch (header->verb) { | |
244 | case VSV_MODEM_CTL_UPDATE: | |
245 | if ((header->word & HVSI_TSCD) == 0) { | |
246 | /* CD went away; no more connection */ | |
247 | pr_debug("hvsi%i: CD dropped\n", hp->index); | |
248 | hp->mctrl &= TIOCM_CD; | |
28c0447d JS |
249 | if (tty && !C_CLOCAL(tty)) |
250 | tty_hangup(tty); | |
1da177e4 LT |
251 | } |
252 | break; | |
253 | case VSV_CLOSE_PROTOCOL: | |
254 | pr_debug("hvsi%i: service processor came back\n", hp->index); | |
255 | if (hp->state != HVSI_CLOSED) { | |
256 | *to_handshake = hp; | |
257 | } | |
258 | break; | |
259 | default: | |
260 | printk(KERN_WARNING "hvsi%i: unknown HVSI control packet: ", | |
261 | hp->index); | |
262 | dump_packet(packet); | |
263 | break; | |
264 | } | |
265 | } | |
266 | ||
267 | static void hvsi_recv_response(struct hvsi_struct *hp, uint8_t *packet) | |
268 | { | |
269 | struct hvsi_query_response *resp = (struct hvsi_query_response *)packet; | |
270 | ||
271 | switch (hp->state) { | |
272 | case HVSI_WAIT_FOR_VER_RESPONSE: | |
273 | __set_state(hp, HVSI_WAIT_FOR_VER_QUERY); | |
274 | break; | |
275 | case HVSI_WAIT_FOR_MCTRL_RESPONSE: | |
276 | hp->mctrl = 0; | |
277 | if (resp->u.mctrl_word & HVSI_TSDTR) | |
278 | hp->mctrl |= TIOCM_DTR; | |
279 | if (resp->u.mctrl_word & HVSI_TSCD) | |
280 | hp->mctrl |= TIOCM_CD; | |
281 | __set_state(hp, HVSI_OPEN); | |
282 | break; | |
283 | default: | |
284 | printk(KERN_ERR "hvsi%i: unexpected query response: ", hp->index); | |
285 | dump_packet(packet); | |
286 | break; | |
287 | } | |
288 | } | |
289 | ||
290 | /* respond to service processor's version query */ | |
291 | static int hvsi_version_respond(struct hvsi_struct *hp, uint16_t query_seqno) | |
292 | { | |
293 | struct hvsi_query_response packet __ALIGNED__; | |
294 | int wrote; | |
295 | ||
048bee77 BH |
296 | packet.hdr.type = VS_QUERY_RESPONSE_PACKET_HEADER; |
297 | packet.hdr.len = sizeof(struct hvsi_query_response); | |
298 | packet.hdr.seqno = atomic_inc_return(&hp->seqno); | |
1da177e4 LT |
299 | packet.verb = VSV_SEND_VERSION_NUMBER; |
300 | packet.u.version = HVSI_VERSION; | |
301 | packet.query_seqno = query_seqno+1; | |
302 | ||
048bee77 BH |
303 | pr_debug("%s: sending %i bytes\n", __func__, packet.hdr.len); |
304 | dbg_dump_hex((uint8_t*)&packet, packet.hdr.len); | |
1da177e4 | 305 | |
048bee77 BH |
306 | wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len); |
307 | if (wrote != packet.hdr.len) { | |
1da177e4 LT |
308 | printk(KERN_ERR "hvsi%i: couldn't send query response!\n", |
309 | hp->index); | |
310 | return -EIO; | |
311 | } | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
316 | static void hvsi_recv_query(struct hvsi_struct *hp, uint8_t *packet) | |
317 | { | |
318 | struct hvsi_query *query = (struct hvsi_query *)packet; | |
319 | ||
320 | switch (hp->state) { | |
321 | case HVSI_WAIT_FOR_VER_QUERY: | |
048bee77 | 322 | hvsi_version_respond(hp, query->hdr.seqno); |
1da177e4 LT |
323 | __set_state(hp, HVSI_OPEN); |
324 | break; | |
325 | default: | |
326 | printk(KERN_ERR "hvsi%i: unexpected query: ", hp->index); | |
327 | dump_packet(packet); | |
328 | break; | |
329 | } | |
330 | } | |
331 | ||
28c0447d JS |
332 | static void hvsi_insert_chars(struct hvsi_struct *hp, struct tty_struct *tty, |
333 | const char *buf, int len) | |
1da177e4 LT |
334 | { |
335 | int i; | |
336 | ||
337 | for (i=0; i < len; i++) { | |
338 | char c = buf[i]; | |
339 | #ifdef CONFIG_MAGIC_SYSRQ | |
340 | if (c == '\0') { | |
341 | hp->sysrq = 1; | |
342 | continue; | |
343 | } else if (hp->sysrq) { | |
f335397d | 344 | handle_sysrq(c); |
1da177e4 LT |
345 | hp->sysrq = 0; |
346 | continue; | |
347 | } | |
348 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
28c0447d | 349 | tty_insert_flip_char(tty, c, 0); |
1da177e4 LT |
350 | } |
351 | } | |
352 | ||
353 | /* | |
354 | * We could get 252 bytes of data at once here. But the tty layer only | |
355 | * throttles us at TTY_THRESHOLD_THROTTLE (128) bytes, so we could overflow | |
356 | * it. Accordingly we won't send more than 128 bytes at a time to the flip | |
357 | * buffer, which will give the tty buffer a chance to throttle us. Should the | |
358 | * value of TTY_THRESHOLD_THROTTLE change in n_tty.c, this code should be | |
359 | * revisited. | |
360 | */ | |
361 | #define TTY_THRESHOLD_THROTTLE 128 | |
28c0447d | 362 | static bool hvsi_recv_data(struct hvsi_struct *hp, struct tty_struct *tty, |
1da177e4 LT |
363 | const uint8_t *packet) |
364 | { | |
365 | const struct hvsi_header *header = (const struct hvsi_header *)packet; | |
366 | const uint8_t *data = packet + sizeof(struct hvsi_header); | |
367 | int datalen = header->len - sizeof(struct hvsi_header); | |
368 | int overflow = datalen - TTY_THRESHOLD_THROTTLE; | |
369 | ||
370 | pr_debug("queueing %i chars '%.*s'\n", datalen, datalen, data); | |
371 | ||
372 | if (datalen == 0) | |
28c0447d | 373 | return false; |
1da177e4 LT |
374 | |
375 | if (overflow > 0) { | |
bf9d8929 | 376 | pr_debug("%s: got >TTY_THRESHOLD_THROTTLE bytes\n", __func__); |
1da177e4 LT |
377 | datalen = TTY_THRESHOLD_THROTTLE; |
378 | } | |
379 | ||
28c0447d | 380 | hvsi_insert_chars(hp, tty, data, datalen); |
1da177e4 LT |
381 | |
382 | if (overflow > 0) { | |
383 | /* | |
384 | * we still have more data to deliver, so we need to save off the | |
385 | * overflow and send it later | |
386 | */ | |
bf9d8929 | 387 | pr_debug("%s: deferring overflow\n", __func__); |
1da177e4 LT |
388 | memcpy(hp->throttle_buf, data + TTY_THRESHOLD_THROTTLE, overflow); |
389 | hp->n_throttle = overflow; | |
390 | } | |
391 | ||
28c0447d | 392 | return true; |
1da177e4 LT |
393 | } |
394 | ||
395 | /* | |
396 | * Returns true/false indicating data successfully read from hypervisor. | |
397 | * Used both to get packets for tty connections and to advance the state | |
398 | * machine during console handshaking (in which case tty = NULL and we ignore | |
399 | * incoming data). | |
400 | */ | |
28c0447d JS |
401 | static int hvsi_load_chunk(struct hvsi_struct *hp, struct tty_struct *tty, |
402 | struct hvsi_struct **handshake) | |
1da177e4 LT |
403 | { |
404 | uint8_t *packet = hp->inbuf; | |
405 | int chunklen; | |
28c0447d | 406 | bool flip = false; |
1da177e4 | 407 | |
1da177e4 LT |
408 | *handshake = NULL; |
409 | ||
410 | chunklen = hvsi_read(hp, hp->inbuf_end, HVSI_MAX_READ); | |
411 | if (chunklen == 0) { | |
bf9d8929 | 412 | pr_debug("%s: 0-length read\n", __func__); |
1da177e4 LT |
413 | return 0; |
414 | } | |
415 | ||
bf9d8929 | 416 | pr_debug("%s: got %i bytes\n", __func__, chunklen); |
1da177e4 LT |
417 | dbg_dump_hex(hp->inbuf_end, chunklen); |
418 | ||
419 | hp->inbuf_end += chunklen; | |
420 | ||
421 | /* handle all completed packets */ | |
422 | while ((packet < hp->inbuf_end) && got_packet(hp, packet)) { | |
423 | struct hvsi_header *header = (struct hvsi_header *)packet; | |
424 | ||
425 | if (!is_header(packet)) { | |
426 | printk(KERN_ERR "hvsi%i: got malformed packet\n", hp->index); | |
427 | /* skip bytes until we find a header or run out of data */ | |
428 | while ((packet < hp->inbuf_end) && (!is_header(packet))) | |
429 | packet++; | |
430 | continue; | |
431 | } | |
432 | ||
bf9d8929 | 433 | pr_debug("%s: handling %i-byte packet\n", __func__, |
1da177e4 LT |
434 | len_packet(packet)); |
435 | dbg_dump_packet(packet); | |
436 | ||
437 | switch (header->type) { | |
438 | case VS_DATA_PACKET_HEADER: | |
439 | if (!is_open(hp)) | |
440 | break; | |
28c0447d | 441 | if (tty == NULL) |
1da177e4 | 442 | break; /* no tty buffer to put data in */ |
28c0447d | 443 | flip = hvsi_recv_data(hp, tty, packet); |
1da177e4 LT |
444 | break; |
445 | case VS_CONTROL_PACKET_HEADER: | |
28c0447d | 446 | hvsi_recv_control(hp, packet, tty, handshake); |
1da177e4 LT |
447 | break; |
448 | case VS_QUERY_RESPONSE_PACKET_HEADER: | |
449 | hvsi_recv_response(hp, packet); | |
450 | break; | |
451 | case VS_QUERY_PACKET_HEADER: | |
452 | hvsi_recv_query(hp, packet); | |
453 | break; | |
454 | default: | |
455 | printk(KERN_ERR "hvsi%i: unknown HVSI packet type 0x%x\n", | |
456 | hp->index, header->type); | |
457 | dump_packet(packet); | |
458 | break; | |
459 | } | |
460 | ||
461 | packet += len_packet(packet); | |
462 | ||
28c0447d JS |
463 | if (*handshake) { |
464 | pr_debug("%s: handshake\n", __func__); | |
1da177e4 LT |
465 | break; |
466 | } | |
467 | } | |
468 | ||
469 | compact_inbuf(hp, packet); | |
470 | ||
28c0447d JS |
471 | if (flip) |
472 | tty_flip_buffer_push(tty); | |
473 | ||
1da177e4 LT |
474 | return 1; |
475 | } | |
476 | ||
28c0447d | 477 | static void hvsi_send_overflow(struct hvsi_struct *hp, struct tty_struct *tty) |
1da177e4 | 478 | { |
bf9d8929 | 479 | pr_debug("%s: delivering %i bytes overflow\n", __func__, |
1da177e4 LT |
480 | hp->n_throttle); |
481 | ||
28c0447d | 482 | hvsi_insert_chars(hp, tty, hp->throttle_buf, hp->n_throttle); |
1da177e4 LT |
483 | hp->n_throttle = 0; |
484 | } | |
485 | ||
486 | /* | |
487 | * must get all pending data because we only get an irq on empty->non-empty | |
488 | * transition | |
489 | */ | |
7d12e780 | 490 | static irqreturn_t hvsi_interrupt(int irq, void *arg) |
1da177e4 LT |
491 | { |
492 | struct hvsi_struct *hp = (struct hvsi_struct *)arg; | |
1da177e4 | 493 | struct hvsi_struct *handshake; |
daea4402 | 494 | struct tty_struct *tty; |
1da177e4 LT |
495 | unsigned long flags; |
496 | int again = 1; | |
497 | ||
bf9d8929 | 498 | pr_debug("%s\n", __func__); |
1da177e4 | 499 | |
daea4402 JS |
500 | tty = tty_port_tty_get(&hp->port); |
501 | ||
1da177e4 LT |
502 | while (again) { |
503 | spin_lock_irqsave(&hp->lock, flags); | |
daea4402 | 504 | again = hvsi_load_chunk(hp, tty, &handshake); |
1da177e4 LT |
505 | spin_unlock_irqrestore(&hp->lock, flags); |
506 | ||
1da177e4 LT |
507 | if (handshake) { |
508 | pr_debug("hvsi%i: attempting re-handshake\n", handshake->index); | |
509 | schedule_work(&handshake->handshaker); | |
510 | } | |
511 | } | |
512 | ||
513 | spin_lock_irqsave(&hp->lock, flags); | |
daea4402 JS |
514 | if (tty && hp->n_throttle && !test_bit(TTY_THROTTLED, &tty->flags)) { |
515 | /* we weren't hung up and we weren't throttled, so we can | |
516 | * deliver the rest now */ | |
517 | hvsi_send_overflow(hp, tty); | |
518 | tty_flip_buffer_push(tty); | |
1da177e4 LT |
519 | } |
520 | spin_unlock_irqrestore(&hp->lock, flags); | |
521 | ||
daea4402 JS |
522 | tty_kref_put(tty); |
523 | ||
1da177e4 LT |
524 | return IRQ_HANDLED; |
525 | } | |
526 | ||
527 | /* for boot console, before the irq handler is running */ | |
528 | static int __init poll_for_state(struct hvsi_struct *hp, int state) | |
529 | { | |
530 | unsigned long end_jiffies = jiffies + HVSI_TIMEOUT; | |
531 | ||
532 | for (;;) { | |
7d12e780 | 533 | hvsi_interrupt(hp->virq, (void *)hp); /* get pending data */ |
1da177e4 LT |
534 | |
535 | if (hp->state == state) | |
536 | return 0; | |
537 | ||
538 | mdelay(5); | |
539 | if (time_after(jiffies, end_jiffies)) | |
540 | return -EIO; | |
541 | } | |
542 | } | |
543 | ||
544 | /* wait for irq handler to change our state */ | |
545 | static int wait_for_state(struct hvsi_struct *hp, int state) | |
546 | { | |
547 | int ret = 0; | |
548 | ||
549 | if (!wait_event_timeout(hp->stateq, (hp->state == state), HVSI_TIMEOUT)) | |
550 | ret = -EIO; | |
551 | ||
552 | return ret; | |
553 | } | |
554 | ||
555 | static int hvsi_query(struct hvsi_struct *hp, uint16_t verb) | |
556 | { | |
557 | struct hvsi_query packet __ALIGNED__; | |
558 | int wrote; | |
559 | ||
048bee77 BH |
560 | packet.hdr.type = VS_QUERY_PACKET_HEADER; |
561 | packet.hdr.len = sizeof(struct hvsi_query); | |
562 | packet.hdr.seqno = atomic_inc_return(&hp->seqno); | |
1da177e4 LT |
563 | packet.verb = verb; |
564 | ||
048bee77 BH |
565 | pr_debug("%s: sending %i bytes\n", __func__, packet.hdr.len); |
566 | dbg_dump_hex((uint8_t*)&packet, packet.hdr.len); | |
1da177e4 | 567 | |
048bee77 BH |
568 | wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len); |
569 | if (wrote != packet.hdr.len) { | |
1da177e4 LT |
570 | printk(KERN_ERR "hvsi%i: couldn't send query (%i)!\n", hp->index, |
571 | wrote); | |
572 | return -EIO; | |
573 | } | |
574 | ||
575 | return 0; | |
576 | } | |
577 | ||
578 | static int hvsi_get_mctrl(struct hvsi_struct *hp) | |
579 | { | |
580 | int ret; | |
581 | ||
582 | set_state(hp, HVSI_WAIT_FOR_MCTRL_RESPONSE); | |
583 | hvsi_query(hp, VSV_SEND_MODEM_CTL_STATUS); | |
584 | ||
585 | ret = hvsi_wait(hp, HVSI_OPEN); | |
586 | if (ret < 0) { | |
587 | printk(KERN_ERR "hvsi%i: didn't get modem flags\n", hp->index); | |
588 | set_state(hp, HVSI_OPEN); | |
589 | return ret; | |
590 | } | |
591 | ||
bf9d8929 | 592 | pr_debug("%s: mctrl 0x%x\n", __func__, hp->mctrl); |
1da177e4 LT |
593 | |
594 | return 0; | |
595 | } | |
596 | ||
597 | /* note that we can only set DTR */ | |
598 | static int hvsi_set_mctrl(struct hvsi_struct *hp, uint16_t mctrl) | |
599 | { | |
600 | struct hvsi_control packet __ALIGNED__; | |
601 | int wrote; | |
602 | ||
048bee77 BH |
603 | packet.hdr.type = VS_CONTROL_PACKET_HEADER, |
604 | packet.hdr.seqno = atomic_inc_return(&hp->seqno); | |
605 | packet.hdr.len = sizeof(struct hvsi_control); | |
1da177e4 LT |
606 | packet.verb = VSV_SET_MODEM_CTL; |
607 | packet.mask = HVSI_TSDTR; | |
608 | ||
609 | if (mctrl & TIOCM_DTR) | |
610 | packet.word = HVSI_TSDTR; | |
611 | ||
048bee77 BH |
612 | pr_debug("%s: sending %i bytes\n", __func__, packet.hdr.len); |
613 | dbg_dump_hex((uint8_t*)&packet, packet.hdr.len); | |
1da177e4 | 614 | |
048bee77 BH |
615 | wrote = hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len); |
616 | if (wrote != packet.hdr.len) { | |
1da177e4 LT |
617 | printk(KERN_ERR "hvsi%i: couldn't set DTR!\n", hp->index); |
618 | return -EIO; | |
619 | } | |
620 | ||
621 | return 0; | |
622 | } | |
623 | ||
624 | static void hvsi_drain_input(struct hvsi_struct *hp) | |
625 | { | |
626 | uint8_t buf[HVSI_MAX_READ] __ALIGNED__; | |
627 | unsigned long end_jiffies = jiffies + HVSI_TIMEOUT; | |
628 | ||
629 | while (time_before(end_jiffies, jiffies)) | |
630 | if (0 == hvsi_read(hp, buf, HVSI_MAX_READ)) | |
631 | break; | |
632 | } | |
633 | ||
634 | static int hvsi_handshake(struct hvsi_struct *hp) | |
635 | { | |
636 | int ret; | |
637 | ||
638 | /* | |
639 | * We could have a CLOSE or other data waiting for us before we even try | |
640 | * to open; try to throw it all away so we don't get confused. (CLOSE | |
641 | * is the first message sent up the pipe when the FSP comes online. We | |
642 | * need to distinguish between "it came up a while ago and we're the first | |
643 | * user" and "it was just reset before it saw our handshake packet".) | |
644 | */ | |
645 | hvsi_drain_input(hp); | |
646 | ||
647 | set_state(hp, HVSI_WAIT_FOR_VER_RESPONSE); | |
648 | ret = hvsi_query(hp, VSV_SEND_VERSION_NUMBER); | |
649 | if (ret < 0) { | |
650 | printk(KERN_ERR "hvsi%i: couldn't send version query\n", hp->index); | |
651 | return ret; | |
652 | } | |
653 | ||
654 | ret = hvsi_wait(hp, HVSI_OPEN); | |
655 | if (ret < 0) | |
656 | return ret; | |
657 | ||
658 | return 0; | |
659 | } | |
660 | ||
c4028958 | 661 | static void hvsi_handshaker(struct work_struct *work) |
1da177e4 | 662 | { |
c4028958 DH |
663 | struct hvsi_struct *hp = |
664 | container_of(work, struct hvsi_struct, handshaker); | |
1da177e4 LT |
665 | |
666 | if (hvsi_handshake(hp) >= 0) | |
667 | return; | |
668 | ||
669 | printk(KERN_ERR "hvsi%i: re-handshaking failed\n", hp->index); | |
670 | if (is_console(hp)) { | |
671 | /* | |
672 | * ttys will re-attempt the handshake via hvsi_open, but | |
673 | * the console will not. | |
674 | */ | |
675 | printk(KERN_ERR "hvsi%i: lost console!\n", hp->index); | |
676 | } | |
677 | } | |
678 | ||
679 | static int hvsi_put_chars(struct hvsi_struct *hp, const char *buf, int count) | |
680 | { | |
681 | struct hvsi_data packet __ALIGNED__; | |
682 | int ret; | |
683 | ||
684 | BUG_ON(count > HVSI_MAX_OUTGOING_DATA); | |
685 | ||
048bee77 BH |
686 | packet.hdr.type = VS_DATA_PACKET_HEADER; |
687 | packet.hdr.seqno = atomic_inc_return(&hp->seqno); | |
688 | packet.hdr.len = count + sizeof(struct hvsi_header); | |
1da177e4 LT |
689 | memcpy(&packet.data, buf, count); |
690 | ||
048bee77 BH |
691 | ret = hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len); |
692 | if (ret == packet.hdr.len) { | |
1da177e4 LT |
693 | /* return the number of chars written, not the packet length */ |
694 | return count; | |
695 | } | |
696 | return ret; /* return any errors */ | |
697 | } | |
698 | ||
699 | static void hvsi_close_protocol(struct hvsi_struct *hp) | |
700 | { | |
701 | struct hvsi_control packet __ALIGNED__; | |
702 | ||
048bee77 BH |
703 | packet.hdr.type = VS_CONTROL_PACKET_HEADER; |
704 | packet.hdr.seqno = atomic_inc_return(&hp->seqno); | |
705 | packet.hdr.len = 6; | |
1da177e4 LT |
706 | packet.verb = VSV_CLOSE_PROTOCOL; |
707 | ||
048bee77 BH |
708 | pr_debug("%s: sending %i bytes\n", __func__, packet.hdr.len); |
709 | dbg_dump_hex((uint8_t*)&packet, packet.hdr.len); | |
1da177e4 | 710 | |
048bee77 | 711 | hvc_put_chars(hp->vtermno, (char *)&packet, packet.hdr.len); |
1da177e4 LT |
712 | } |
713 | ||
714 | static int hvsi_open(struct tty_struct *tty, struct file *filp) | |
715 | { | |
716 | struct hvsi_struct *hp; | |
717 | unsigned long flags; | |
1da177e4 LT |
718 | int ret; |
719 | ||
bf9d8929 | 720 | pr_debug("%s\n", __func__); |
1da177e4 | 721 | |
410235fd | 722 | hp = &hvsi_ports[tty->index]; |
1da177e4 LT |
723 | |
724 | tty->driver_data = hp; | |
1da177e4 LT |
725 | |
726 | mb(); | |
727 | if (hp->state == HVSI_FSP_DIED) | |
728 | return -EIO; | |
729 | ||
daea4402 | 730 | tty_port_tty_set(&hp->port, tty); |
1da177e4 | 731 | spin_lock_irqsave(&hp->lock, flags); |
d73a4e79 | 732 | hp->port.count++; |
1da177e4 LT |
733 | atomic_set(&hp->seqno, 0); |
734 | h_vio_signal(hp->vtermno, VIO_IRQ_ENABLE); | |
735 | spin_unlock_irqrestore(&hp->lock, flags); | |
736 | ||
737 | if (is_console(hp)) | |
738 | return 0; /* this has already been handshaked as the console */ | |
739 | ||
740 | ret = hvsi_handshake(hp); | |
741 | if (ret < 0) { | |
742 | printk(KERN_ERR "%s: HVSI handshaking failed\n", tty->name); | |
743 | return ret; | |
744 | } | |
745 | ||
746 | ret = hvsi_get_mctrl(hp); | |
747 | if (ret < 0) { | |
748 | printk(KERN_ERR "%s: couldn't get initial modem flags\n", tty->name); | |
749 | return ret; | |
750 | } | |
751 | ||
752 | ret = hvsi_set_mctrl(hp, hp->mctrl | TIOCM_DTR); | |
753 | if (ret < 0) { | |
754 | printk(KERN_ERR "%s: couldn't set DTR\n", tty->name); | |
755 | return ret; | |
756 | } | |
757 | ||
758 | return 0; | |
759 | } | |
760 | ||
761 | /* wait for hvsi_write_worker to empty hp->outbuf */ | |
762 | static void hvsi_flush_output(struct hvsi_struct *hp) | |
763 | { | |
764 | wait_event_timeout(hp->emptyq, (hp->n_outbuf <= 0), HVSI_TIMEOUT); | |
765 | ||
766 | /* 'writer' could still be pending if it didn't see n_outbuf = 0 yet */ | |
42565999 | 767 | cancel_delayed_work_sync(&hp->writer); |
43829731 | 768 | flush_work(&hp->handshaker); |
1da177e4 LT |
769 | |
770 | /* | |
771 | * it's also possible that our timeout expired and hvsi_write_worker | |
772 | * didn't manage to push outbuf. poof. | |
773 | */ | |
774 | hp->n_outbuf = 0; | |
775 | } | |
776 | ||
777 | static void hvsi_close(struct tty_struct *tty, struct file *filp) | |
778 | { | |
779 | struct hvsi_struct *hp = tty->driver_data; | |
780 | unsigned long flags; | |
781 | ||
bf9d8929 | 782 | pr_debug("%s\n", __func__); |
1da177e4 LT |
783 | |
784 | if (tty_hung_up_p(filp)) | |
785 | return; | |
786 | ||
787 | spin_lock_irqsave(&hp->lock, flags); | |
788 | ||
d73a4e79 | 789 | if (--hp->port.count == 0) { |
daea4402 | 790 | tty_port_tty_set(&hp->port, NULL); |
1da177e4 LT |
791 | hp->inbuf_end = hp->inbuf; /* discard remaining partial packets */ |
792 | ||
793 | /* only close down connection if it is not the console */ | |
794 | if (!is_console(hp)) { | |
795 | h_vio_signal(hp->vtermno, VIO_IRQ_DISABLE); /* no more irqs */ | |
796 | __set_state(hp, HVSI_CLOSED); | |
797 | /* | |
798 | * any data delivered to the tty layer after this will be | |
799 | * discarded (except for XON/XOFF) | |
800 | */ | |
801 | tty->closing = 1; | |
802 | ||
803 | spin_unlock_irqrestore(&hp->lock, flags); | |
804 | ||
805 | /* let any existing irq handlers finish. no more will start. */ | |
806 | synchronize_irq(hp->virq); | |
807 | ||
808 | /* hvsi_write_worker will re-schedule until outbuf is empty. */ | |
809 | hvsi_flush_output(hp); | |
810 | ||
811 | /* tell FSP to stop sending data */ | |
812 | hvsi_close_protocol(hp); | |
813 | ||
814 | /* | |
815 | * drain anything FSP is still in the middle of sending, and let | |
816 | * hvsi_handshake drain the rest on the next open. | |
817 | */ | |
818 | hvsi_drain_input(hp); | |
819 | ||
820 | spin_lock_irqsave(&hp->lock, flags); | |
821 | } | |
d73a4e79 | 822 | } else if (hp->port.count < 0) |
1da177e4 | 823 | printk(KERN_ERR "hvsi_close %lu: oops, count is %d\n", |
d73a4e79 | 824 | hp - hvsi_ports, hp->port.count); |
1da177e4 LT |
825 | |
826 | spin_unlock_irqrestore(&hp->lock, flags); | |
827 | } | |
828 | ||
829 | static void hvsi_hangup(struct tty_struct *tty) | |
830 | { | |
831 | struct hvsi_struct *hp = tty->driver_data; | |
832 | unsigned long flags; | |
833 | ||
bf9d8929 | 834 | pr_debug("%s\n", __func__); |
1da177e4 | 835 | |
daea4402 | 836 | tty_port_tty_set(&hp->port, NULL); |
1da177e4 | 837 | |
daea4402 | 838 | spin_lock_irqsave(&hp->lock, flags); |
d73a4e79 | 839 | hp->port.count = 0; |
1da177e4 | 840 | hp->n_outbuf = 0; |
1da177e4 LT |
841 | spin_unlock_irqrestore(&hp->lock, flags); |
842 | } | |
843 | ||
844 | /* called with hp->lock held */ | |
845 | static void hvsi_push(struct hvsi_struct *hp) | |
846 | { | |
847 | int n; | |
848 | ||
849 | if (hp->n_outbuf <= 0) | |
850 | return; | |
851 | ||
852 | n = hvsi_put_chars(hp, hp->outbuf, hp->n_outbuf); | |
853 | if (n > 0) { | |
854 | /* success */ | |
bf9d8929 | 855 | pr_debug("%s: wrote %i chars\n", __func__, n); |
1da177e4 LT |
856 | hp->n_outbuf = 0; |
857 | } else if (n == -EIO) { | |
858 | __set_state(hp, HVSI_FSP_DIED); | |
859 | printk(KERN_ERR "hvsi%i: service processor died\n", hp->index); | |
860 | } | |
861 | } | |
862 | ||
863 | /* hvsi_write_worker will keep rescheduling itself until outbuf is empty */ | |
c4028958 | 864 | static void hvsi_write_worker(struct work_struct *work) |
1da177e4 | 865 | { |
c4028958 DH |
866 | struct hvsi_struct *hp = |
867 | container_of(work, struct hvsi_struct, writer.work); | |
daea4402 | 868 | struct tty_struct *tty; |
1da177e4 LT |
869 | unsigned long flags; |
870 | #ifdef DEBUG | |
871 | static long start_j = 0; | |
872 | ||
873 | if (start_j == 0) | |
874 | start_j = jiffies; | |
875 | #endif /* DEBUG */ | |
876 | ||
877 | spin_lock_irqsave(&hp->lock, flags); | |
878 | ||
bf9d8929 | 879 | pr_debug("%s: %i chars in buffer\n", __func__, hp->n_outbuf); |
1da177e4 LT |
880 | |
881 | if (!is_open(hp)) { | |
882 | /* | |
883 | * We could have a non-open connection if the service processor died | |
884 | * while we were busily scheduling ourselves. In that case, it could | |
885 | * be minutes before the service processor comes back, so only try | |
886 | * again once a second. | |
887 | */ | |
888 | schedule_delayed_work(&hp->writer, HZ); | |
889 | goto out; | |
890 | } | |
891 | ||
892 | hvsi_push(hp); | |
893 | if (hp->n_outbuf > 0) | |
894 | schedule_delayed_work(&hp->writer, 10); | |
895 | else { | |
896 | #ifdef DEBUG | |
bf9d8929 | 897 | pr_debug("%s: outbuf emptied after %li jiffies\n", __func__, |
1da177e4 LT |
898 | jiffies - start_j); |
899 | start_j = 0; | |
900 | #endif /* DEBUG */ | |
901 | wake_up_all(&hp->emptyq); | |
daea4402 JS |
902 | tty = tty_port_tty_get(&hp->port); |
903 | if (tty) { | |
904 | tty_wakeup(tty); | |
905 | tty_kref_put(tty); | |
906 | } | |
1da177e4 LT |
907 | } |
908 | ||
909 | out: | |
910 | spin_unlock_irqrestore(&hp->lock, flags); | |
911 | } | |
912 | ||
913 | static int hvsi_write_room(struct tty_struct *tty) | |
914 | { | |
c9f19e96 | 915 | struct hvsi_struct *hp = tty->driver_data; |
1da177e4 LT |
916 | |
917 | return N_OUTBUF - hp->n_outbuf; | |
918 | } | |
919 | ||
920 | static int hvsi_chars_in_buffer(struct tty_struct *tty) | |
921 | { | |
c9f19e96 | 922 | struct hvsi_struct *hp = tty->driver_data; |
1da177e4 LT |
923 | |
924 | return hp->n_outbuf; | |
925 | } | |
926 | ||
927 | static int hvsi_write(struct tty_struct *tty, | |
928 | const unsigned char *buf, int count) | |
929 | { | |
930 | struct hvsi_struct *hp = tty->driver_data; | |
931 | const char *source = buf; | |
932 | unsigned long flags; | |
933 | int total = 0; | |
934 | int origcount = count; | |
935 | ||
936 | spin_lock_irqsave(&hp->lock, flags); | |
937 | ||
bf9d8929 | 938 | pr_debug("%s: %i chars in buffer\n", __func__, hp->n_outbuf); |
1da177e4 LT |
939 | |
940 | if (!is_open(hp)) { | |
941 | /* we're either closing or not yet open; don't accept data */ | |
bf9d8929 | 942 | pr_debug("%s: not open\n", __func__); |
1da177e4 LT |
943 | goto out; |
944 | } | |
945 | ||
946 | /* | |
947 | * when the hypervisor buffer (16K) fills, data will stay in hp->outbuf | |
948 | * and hvsi_write_worker will be scheduled. subsequent hvsi_write() calls | |
949 | * will see there is no room in outbuf and return. | |
950 | */ | |
28c0447d JS |
951 | while ((count > 0) && (hvsi_write_room(tty) > 0)) { |
952 | int chunksize = min(count, hvsi_write_room(tty)); | |
1da177e4 LT |
953 | |
954 | BUG_ON(hp->n_outbuf < 0); | |
955 | memcpy(hp->outbuf + hp->n_outbuf, source, chunksize); | |
956 | hp->n_outbuf += chunksize; | |
957 | ||
958 | total += chunksize; | |
959 | source += chunksize; | |
960 | count -= chunksize; | |
961 | hvsi_push(hp); | |
962 | } | |
963 | ||
964 | if (hp->n_outbuf > 0) { | |
965 | /* | |
966 | * we weren't able to write it all to the hypervisor. | |
967 | * schedule another push attempt. | |
968 | */ | |
969 | schedule_delayed_work(&hp->writer, 10); | |
970 | } | |
971 | ||
972 | out: | |
973 | spin_unlock_irqrestore(&hp->lock, flags); | |
974 | ||
975 | if (total != origcount) | |
bf9d8929 | 976 | pr_debug("%s: wanted %i, only wrote %i\n", __func__, origcount, |
1da177e4 LT |
977 | total); |
978 | ||
979 | return total; | |
980 | } | |
981 | ||
982 | /* | |
983 | * I have never seen throttle or unthrottle called, so this little throttle | |
984 | * buffering scheme may or may not work. | |
985 | */ | |
986 | static void hvsi_throttle(struct tty_struct *tty) | |
987 | { | |
c9f19e96 | 988 | struct hvsi_struct *hp = tty->driver_data; |
1da177e4 | 989 | |
bf9d8929 | 990 | pr_debug("%s\n", __func__); |
1da177e4 LT |
991 | |
992 | h_vio_signal(hp->vtermno, VIO_IRQ_DISABLE); | |
993 | } | |
994 | ||
995 | static void hvsi_unthrottle(struct tty_struct *tty) | |
996 | { | |
c9f19e96 | 997 | struct hvsi_struct *hp = tty->driver_data; |
1da177e4 | 998 | unsigned long flags; |
1da177e4 | 999 | |
bf9d8929 | 1000 | pr_debug("%s\n", __func__); |
1da177e4 LT |
1001 | |
1002 | spin_lock_irqsave(&hp->lock, flags); | |
1003 | if (hp->n_throttle) { | |
28c0447d JS |
1004 | hvsi_send_overflow(hp, tty); |
1005 | tty_flip_buffer_push(tty); | |
1da177e4 LT |
1006 | } |
1007 | spin_unlock_irqrestore(&hp->lock, flags); | |
1008 | ||
1da177e4 LT |
1009 | |
1010 | h_vio_signal(hp->vtermno, VIO_IRQ_ENABLE); | |
1011 | } | |
1012 | ||
60b33c13 | 1013 | static int hvsi_tiocmget(struct tty_struct *tty) |
1da177e4 | 1014 | { |
c9f19e96 | 1015 | struct hvsi_struct *hp = tty->driver_data; |
1da177e4 LT |
1016 | |
1017 | hvsi_get_mctrl(hp); | |
1018 | return hp->mctrl; | |
1019 | } | |
1020 | ||
20b9d177 AC |
1021 | static int hvsi_tiocmset(struct tty_struct *tty, |
1022 | unsigned int set, unsigned int clear) | |
1da177e4 | 1023 | { |
c9f19e96 | 1024 | struct hvsi_struct *hp = tty->driver_data; |
1da177e4 LT |
1025 | unsigned long flags; |
1026 | uint16_t new_mctrl; | |
1027 | ||
1028 | /* we can only alter DTR */ | |
1029 | clear &= TIOCM_DTR; | |
1030 | set &= TIOCM_DTR; | |
1031 | ||
1032 | spin_lock_irqsave(&hp->lock, flags); | |
1033 | ||
1034 | new_mctrl = (hp->mctrl & ~clear) | set; | |
1035 | ||
1036 | if (hp->mctrl != new_mctrl) { | |
1037 | hvsi_set_mctrl(hp, new_mctrl); | |
1038 | hp->mctrl = new_mctrl; | |
1039 | } | |
1040 | spin_unlock_irqrestore(&hp->lock, flags); | |
1041 | ||
1042 | return 0; | |
1043 | } | |
1044 | ||
1045 | ||
b68e31d0 | 1046 | static const struct tty_operations hvsi_ops = { |
1da177e4 LT |
1047 | .open = hvsi_open, |
1048 | .close = hvsi_close, | |
1049 | .write = hvsi_write, | |
1050 | .hangup = hvsi_hangup, | |
1051 | .write_room = hvsi_write_room, | |
1052 | .chars_in_buffer = hvsi_chars_in_buffer, | |
1053 | .throttle = hvsi_throttle, | |
1054 | .unthrottle = hvsi_unthrottle, | |
1055 | .tiocmget = hvsi_tiocmget, | |
1056 | .tiocmset = hvsi_tiocmset, | |
1057 | }; | |
1058 | ||
1059 | static int __init hvsi_init(void) | |
1060 | { | |
1061 | int i; | |
1062 | ||
1063 | hvsi_driver = alloc_tty_driver(hvsi_count); | |
1064 | if (!hvsi_driver) | |
1065 | return -ENOMEM; | |
1066 | ||
1da177e4 LT |
1067 | hvsi_driver->driver_name = "hvsi"; |
1068 | hvsi_driver->name = "hvsi"; | |
1069 | hvsi_driver->major = HVSI_MAJOR; | |
1070 | hvsi_driver->minor_start = HVSI_MINOR; | |
1071 | hvsi_driver->type = TTY_DRIVER_TYPE_SYSTEM; | |
1072 | hvsi_driver->init_termios = tty_std_termios; | |
1073 | hvsi_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL; | |
606d099c AC |
1074 | hvsi_driver->init_termios.c_ispeed = 9600; |
1075 | hvsi_driver->init_termios.c_ospeed = 9600; | |
1da177e4 LT |
1076 | hvsi_driver->flags = TTY_DRIVER_REAL_RAW; |
1077 | tty_set_operations(hvsi_driver, &hvsi_ops); | |
1078 | ||
1079 | for (i=0; i < hvsi_count; i++) { | |
1080 | struct hvsi_struct *hp = &hvsi_ports[i]; | |
1081 | int ret = 1; | |
1082 | ||
b19e2ca7 JS |
1083 | tty_port_link_device(&hp->port, hvsi_driver, i); |
1084 | ||
9cfb5c05 | 1085 | ret = request_irq(hp->virq, hvsi_interrupt, 0, "hvsi", hp); |
1da177e4 LT |
1086 | if (ret) |
1087 | printk(KERN_ERR "HVSI: couldn't reserve irq 0x%x (error %i)\n", | |
1088 | hp->virq, ret); | |
1089 | } | |
1090 | hvsi_wait = wait_for_state; /* irqs active now */ | |
1091 | ||
1092 | if (tty_register_driver(hvsi_driver)) | |
1093 | panic("Couldn't register hvsi console driver\n"); | |
1094 | ||
8b6a7b2e | 1095 | printk(KERN_DEBUG "HVSI: registered %i devices\n", hvsi_count); |
1da177e4 LT |
1096 | |
1097 | return 0; | |
1098 | } | |
1099 | device_initcall(hvsi_init); | |
1100 | ||
1101 | /***** console (not tty) code: *****/ | |
1102 | ||
1103 | static void hvsi_console_print(struct console *console, const char *buf, | |
1104 | unsigned int count) | |
1105 | { | |
1106 | struct hvsi_struct *hp = &hvsi_ports[console->index]; | |
1107 | char c[HVSI_MAX_OUTGOING_DATA] __ALIGNED__; | |
1108 | unsigned int i = 0, n = 0; | |
1109 | int ret, donecr = 0; | |
1110 | ||
1111 | mb(); | |
1112 | if (!is_open(hp)) | |
1113 | return; | |
1114 | ||
1115 | /* | |
1116 | * ugh, we have to translate LF -> CRLF ourselves, in place. | |
1117 | * copied from hvc_console.c: | |
1118 | */ | |
1119 | while (count > 0 || i > 0) { | |
1120 | if (count > 0 && i < sizeof(c)) { | |
1121 | if (buf[n] == '\n' && !donecr) { | |
1122 | c[i++] = '\r'; | |
1123 | donecr = 1; | |
1124 | } else { | |
1125 | c[i++] = buf[n++]; | |
1126 | donecr = 0; | |
1127 | --count; | |
1128 | } | |
1129 | } else { | |
1130 | ret = hvsi_put_chars(hp, c, i); | |
1131 | if (ret < 0) | |
1132 | i = 0; | |
1133 | i -= ret; | |
1134 | } | |
1135 | } | |
1136 | } | |
1137 | ||
1138 | static struct tty_driver *hvsi_console_device(struct console *console, | |
1139 | int *index) | |
1140 | { | |
1141 | *index = console->index; | |
1142 | return hvsi_driver; | |
1143 | } | |
1144 | ||
1145 | static int __init hvsi_console_setup(struct console *console, char *options) | |
1146 | { | |
72865650 | 1147 | struct hvsi_struct *hp; |
1da177e4 LT |
1148 | int ret; |
1149 | ||
1150 | if (console->index < 0 || console->index >= hvsi_count) | |
1151 | return -1; | |
72865650 | 1152 | hp = &hvsi_ports[console->index]; |
1da177e4 LT |
1153 | |
1154 | /* give the FSP a chance to change the baud rate when we re-open */ | |
1155 | hvsi_close_protocol(hp); | |
1156 | ||
1157 | ret = hvsi_handshake(hp); | |
1158 | if (ret < 0) | |
1159 | return ret; | |
1160 | ||
1161 | ret = hvsi_get_mctrl(hp); | |
1162 | if (ret < 0) | |
1163 | return ret; | |
1164 | ||
1165 | ret = hvsi_set_mctrl(hp, hp->mctrl | TIOCM_DTR); | |
1166 | if (ret < 0) | |
1167 | return ret; | |
1168 | ||
1169 | hp->flags |= HVSI_CONSOLE; | |
1170 | ||
1171 | return 0; | |
1172 | } | |
1173 | ||
4455b119 | 1174 | static struct console hvsi_console = { |
1da177e4 LT |
1175 | .name = "hvsi", |
1176 | .write = hvsi_console_print, | |
1177 | .device = hvsi_console_device, | |
1178 | .setup = hvsi_console_setup, | |
1179 | .flags = CON_PRINTBUFFER, | |
1180 | .index = -1, | |
1181 | }; | |
1182 | ||
1183 | static int __init hvsi_console_init(void) | |
1184 | { | |
1185 | struct device_node *vty; | |
1186 | ||
1187 | hvsi_wait = poll_for_state; /* no irqs yet; must poll */ | |
1188 | ||
1189 | /* search device tree for vty nodes */ | |
1190 | for (vty = of_find_compatible_node(NULL, "serial", "hvterm-protocol"); | |
1191 | vty != NULL; | |
1192 | vty = of_find_compatible_node(vty, "serial", "hvterm-protocol")) { | |
1193 | struct hvsi_struct *hp; | |
954a46e2 | 1194 | const uint32_t *vtermno, *irq; |
1da177e4 | 1195 | |
01b2726d SR |
1196 | vtermno = of_get_property(vty, "reg", NULL); |
1197 | irq = of_get_property(vty, "interrupts", NULL); | |
1da177e4 LT |
1198 | if (!vtermno || !irq) |
1199 | continue; | |
1200 | ||
1201 | if (hvsi_count >= MAX_NR_HVSI_CONSOLES) { | |
1202 | of_node_put(vty); | |
1203 | break; | |
1204 | } | |
1205 | ||
1206 | hp = &hvsi_ports[hvsi_count]; | |
c4028958 DH |
1207 | INIT_DELAYED_WORK(&hp->writer, hvsi_write_worker); |
1208 | INIT_WORK(&hp->handshaker, hvsi_handshaker); | |
1da177e4 LT |
1209 | init_waitqueue_head(&hp->emptyq); |
1210 | init_waitqueue_head(&hp->stateq); | |
1211 | spin_lock_init(&hp->lock); | |
d73a4e79 | 1212 | tty_port_init(&hp->port); |
1da177e4 LT |
1213 | hp->index = hvsi_count; |
1214 | hp->inbuf_end = hp->inbuf; | |
1215 | hp->state = HVSI_CLOSED; | |
1216 | hp->vtermno = *vtermno; | |
6e99e458 | 1217 | hp->virq = irq_create_mapping(NULL, irq[0]); |
d4e33fac | 1218 | if (hp->virq == 0) { |
1da177e4 | 1219 | printk(KERN_ERR "%s: couldn't create irq mapping for 0x%x\n", |
bf9d8929 | 1220 | __func__, irq[0]); |
191c5f10 | 1221 | tty_port_destroy(&hp->port); |
1da177e4 | 1222 | continue; |
0ebfff14 | 1223 | } |
1da177e4 LT |
1224 | |
1225 | hvsi_count++; | |
1226 | } | |
1227 | ||
1228 | if (hvsi_count) | |
4455b119 | 1229 | register_console(&hvsi_console); |
1da177e4 LT |
1230 | return 0; |
1231 | } | |
1232 | console_initcall(hvsi_console_init); |