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1 | /* |
2 | * PS3 virtual uart |
3 | * |
4 | * Copyright (C) 2006 Sony Computer Entertainment Inc. |
5 | * Copyright 2006 Sony Corp. |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License as published by |
9 | * the Free Software Foundation; version 2 of the License. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program; if not, write to the Free Software |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | */ |
20 | |
21 | #include <linux/kernel.h> |
22 | #include <linux/module.h> |
23 | #include <linux/interrupt.h> |
24 | #include <linux/workqueue.h> |
25 | #include <linux/bitops.h> |
26 | #include <asm/ps3.h> |
27 | |
28 | #include <asm/firmware.h> |
29 | #include <asm/lv1call.h> |
30 | |
31 | #include "vuart.h" |
32 | |
33 | MODULE_AUTHOR("Sony Corporation"); |
34 | MODULE_LICENSE("GPL v2"); |
35 | MODULE_DESCRIPTION("PS3 vuart"); |
36 | |
37 | /** |
38 | * vuart - An inter-partition data link service. |
39 | * port 0: PS3 AV Settings. |
40 | * port 2: PS3 System Manager. |
41 | * |
42 | * The vuart provides a bi-directional byte stream data link between logical |
43 | * partitions. Its primary role is as a communications link between the guest |
44 | * OS and the system policy module. The current HV does not support any |
45 | * connections other than those listed. |
46 | */ |
47 | |
48 | enum {PORT_COUNT = 3,}; |
49 | |
50 | enum vuart_param { |
51 | PARAM_TX_TRIGGER = 0, |
52 | PARAM_RX_TRIGGER = 1, |
53 | PARAM_INTERRUPT_MASK = 2, |
54 | PARAM_RX_BUF_SIZE = 3, /* read only */ |
55 | PARAM_RX_BYTES = 4, /* read only */ |
56 | PARAM_TX_BUF_SIZE = 5, /* read only */ |
57 | PARAM_TX_BYTES = 6, /* read only */ |
58 | PARAM_INTERRUPT_STATUS = 7, /* read only */ |
59 | }; |
60 | |
61 | enum vuart_interrupt_bit { |
62 | INTERRUPT_BIT_TX = 0, |
63 | INTERRUPT_BIT_RX = 1, |
64 | INTERRUPT_BIT_DISCONNECT = 2, |
65 | }; |
66 | |
67 | enum vuart_interrupt_mask { |
68 | INTERRUPT_MASK_TX = 1, |
69 | INTERRUPT_MASK_RX = 2, |
70 | INTERRUPT_MASK_DISCONNECT = 4, |
71 | }; |
72 | |
73 | /** |
74 | * struct ps3_vuart_port_priv - private vuart device data. |
75 | */ |
76 | |
77 | struct ps3_vuart_port_priv { |
78 | u64 interrupt_mask; |
79 | |
80 | struct { |
81 | spinlock_t lock; |
82 | struct list_head head; |
83 | } tx_list; |
84 | struct { |
85 | struct ps3_vuart_work work; |
86 | unsigned long bytes_held; |
87 | spinlock_t lock; |
88 | struct list_head head; |
89 | } rx_list; |
90 | struct ps3_vuart_stats stats; |
91 | }; |
92 | |
93 | static struct ps3_vuart_port_priv *to_port_priv( |
94 | struct ps3_system_bus_device *dev) |
95 | { |
96 | BUG_ON(!dev); |
97 | BUG_ON(!dev->driver_priv); |
98 | return (struct ps3_vuart_port_priv *)dev->driver_priv; |
99 | } |
100 | |
101 | /** |
102 | * struct ports_bmp - bitmap indicating ports needing service. |
103 | * |
104 | * A 256 bit read only bitmap indicating ports needing service. Do not write |
105 | * to these bits. Must not cross a page boundary. |
106 | */ |
107 | |
108 | struct ports_bmp { |
109 | u64 status; |
110 | u64 unused[3]; |
111 | } __attribute__((aligned(32))); |
112 | |
113 | #define dump_ports_bmp(_b) _dump_ports_bmp(_b, __func__, __LINE__) |
114 | static void __maybe_unused _dump_ports_bmp( |
115 | const struct ports_bmp *bmp, const char *func, int line) |
116 | { |
117 | pr_debug("%s:%d: ports_bmp: %016llxh\n", func, line, bmp->status); |
118 | } |
119 | |
120 | #define dump_port_params(_b) _dump_port_params(_b, __func__, __LINE__) |
121 | static void __maybe_unused _dump_port_params(unsigned int port_number, |
122 | const char *func, int line) |
123 | { |
124 | #if defined(DEBUG) |
125 | static const char *strings[] = { |
126 | "tx_trigger ", |
127 | "rx_trigger ", |
128 | "interrupt_mask ", |
129 | "rx_buf_size ", |
130 | "rx_bytes ", |
131 | "tx_buf_size ", |
132 | "tx_bytes ", |
133 | "interrupt_status", |
134 | }; |
135 | int result; |
136 | unsigned int i; |
137 | u64 value; |
138 | |
139 | for (i = 0; i < ARRAY_SIZE(strings); i++) { |
140 | result = lv1_get_virtual_uart_param(port_number, i, &value); |
141 | |
142 | if (result) { |
143 | pr_debug("%s:%d: port_%u: %s failed: %s\n", func, line, |
144 | port_number, strings[i], ps3_result(result)); |
145 | continue; |
146 | } |
147 | pr_debug("%s:%d: port_%u: %s = %lxh\n", |
148 | func, line, port_number, strings[i], value); |
149 | } |
150 | #endif |
151 | } |
152 | |
153 | struct vuart_triggers { |
154 | unsigned long rx; |
155 | unsigned long tx; |
156 | }; |
157 | |
158 | int ps3_vuart_get_triggers(struct ps3_system_bus_device *dev, |
159 | struct vuart_triggers *trig) |
160 | { |
161 | int result; |
162 | u64 size; |
163 | u64 val; |
164 | u64 tx; |
165 | |
166 | result = lv1_get_virtual_uart_param(dev->port_number, |
167 | PARAM_TX_TRIGGER, &tx); |
168 | trig->tx = tx; |
169 | |
170 | if (result) { |
171 | dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n", |
172 | __func__, __LINE__, ps3_result(result)); |
173 | return result; |
174 | } |
175 | |
176 | result = lv1_get_virtual_uart_param(dev->port_number, |
177 | PARAM_RX_BUF_SIZE, &size); |
178 | |
179 | if (result) { |
180 | dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n", |
181 | __func__, __LINE__, ps3_result(result)); |
182 | return result; |
183 | } |
184 | |
185 | result = lv1_get_virtual_uart_param(dev->port_number, |
186 | PARAM_RX_TRIGGER, &val); |
187 | |
188 | if (result) { |
189 | dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n", |
190 | __func__, __LINE__, ps3_result(result)); |
191 | return result; |
192 | } |
193 | |
194 | trig->rx = size - val; |
195 | |
196 | dev_dbg(&dev->core, "%s:%d: tx %lxh, rx %lxh\n", __func__, __LINE__, |
197 | trig->tx, trig->rx); |
198 | |
199 | return result; |
200 | } |
201 | |
202 | int ps3_vuart_set_triggers(struct ps3_system_bus_device *dev, unsigned int tx, |
203 | unsigned int rx) |
204 | { |
205 | int result; |
206 | u64 size; |
207 | |
208 | result = lv1_set_virtual_uart_param(dev->port_number, |
209 | PARAM_TX_TRIGGER, tx); |
210 | |
211 | if (result) { |
212 | dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n", |
213 | __func__, __LINE__, ps3_result(result)); |
214 | return result; |
215 | } |
216 | |
217 | result = lv1_get_virtual_uart_param(dev->port_number, |
218 | PARAM_RX_BUF_SIZE, &size); |
219 | |
220 | if (result) { |
221 | dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n", |
222 | __func__, __LINE__, ps3_result(result)); |
223 | return result; |
224 | } |
225 | |
226 | result = lv1_set_virtual_uart_param(dev->port_number, |
227 | PARAM_RX_TRIGGER, size - rx); |
228 | |
229 | if (result) { |
230 | dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n", |
231 | __func__, __LINE__, ps3_result(result)); |
232 | return result; |
233 | } |
234 | |
235 | dev_dbg(&dev->core, "%s:%d: tx %xh, rx %xh\n", __func__, __LINE__, |
236 | tx, rx); |
237 | |
238 | return result; |
239 | } |
240 | |
241 | static int ps3_vuart_get_rx_bytes_waiting(struct ps3_system_bus_device *dev, |
242 | u64 *bytes_waiting) |
243 | { |
244 | int result; |
245 | |
246 | result = lv1_get_virtual_uart_param(dev->port_number, |
247 | PARAM_RX_BYTES, bytes_waiting); |
248 | |
249 | if (result) |
250 | dev_dbg(&dev->core, "%s:%d: rx_bytes failed: %s\n", |
251 | __func__, __LINE__, ps3_result(result)); |
252 | |
253 | dev_dbg(&dev->core, "%s:%d: %llxh\n", __func__, __LINE__, |
254 | *bytes_waiting); |
255 | return result; |
256 | } |
257 | |
258 | /** |
259 | * ps3_vuart_set_interrupt_mask - Enable/disable the port interrupt sources. |
260 | * @dev: The struct ps3_system_bus_device instance. |
261 | * @bmp: Logical OR of enum vuart_interrupt_mask values. A zero bit disables. |
262 | */ |
263 | |
264 | static int ps3_vuart_set_interrupt_mask(struct ps3_system_bus_device *dev, |
265 | unsigned long mask) |
266 | { |
267 | int result; |
268 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
269 | |
270 | dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__, mask); |
271 | |
272 | priv->interrupt_mask = mask; |
273 | |
274 | result = lv1_set_virtual_uart_param(dev->port_number, |
275 | PARAM_INTERRUPT_MASK, priv->interrupt_mask); |
276 | |
277 | if (result) |
278 | dev_dbg(&dev->core, "%s:%d: interrupt_mask failed: %s\n", |
279 | __func__, __LINE__, ps3_result(result)); |
280 | |
281 | return result; |
282 | } |
283 | |
284 | static int ps3_vuart_get_interrupt_status(struct ps3_system_bus_device *dev, |
285 | unsigned long *status) |
286 | { |
287 | int result; |
288 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
289 | u64 tmp; |
290 | |
291 | result = lv1_get_virtual_uart_param(dev->port_number, |
292 | PARAM_INTERRUPT_STATUS, &tmp); |
293 | |
294 | if (result) |
295 | dev_dbg(&dev->core, "%s:%d: interrupt_status failed: %s\n", |
296 | __func__, __LINE__, ps3_result(result)); |
297 | |
298 | *status = tmp & priv->interrupt_mask; |
299 | |
300 | dev_dbg(&dev->core, "%s:%d: m %llxh, s %llxh, m&s %lxh\n", |
301 | __func__, __LINE__, priv->interrupt_mask, tmp, *status); |
302 | |
303 | return result; |
304 | } |
305 | |
306 | int ps3_vuart_enable_interrupt_tx(struct ps3_system_bus_device *dev) |
307 | { |
308 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
309 | |
310 | return (priv->interrupt_mask & INTERRUPT_MASK_TX) ? 0 |
311 | : ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask |
312 | | INTERRUPT_MASK_TX); |
313 | } |
314 | |
315 | int ps3_vuart_enable_interrupt_rx(struct ps3_system_bus_device *dev) |
316 | { |
317 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
318 | |
319 | return (priv->interrupt_mask & INTERRUPT_MASK_RX) ? 0 |
320 | : ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask |
321 | | INTERRUPT_MASK_RX); |
322 | } |
323 | |
324 | int ps3_vuart_enable_interrupt_disconnect(struct ps3_system_bus_device *dev) |
325 | { |
326 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
327 | |
328 | return (priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT) ? 0 |
329 | : ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask |
330 | | INTERRUPT_MASK_DISCONNECT); |
331 | } |
332 | |
333 | int ps3_vuart_disable_interrupt_tx(struct ps3_system_bus_device *dev) |
334 | { |
335 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
336 | |
337 | return (priv->interrupt_mask & INTERRUPT_MASK_TX) |
338 | ? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask |
339 | & ~INTERRUPT_MASK_TX) : 0; |
340 | } |
341 | |
342 | int ps3_vuart_disable_interrupt_rx(struct ps3_system_bus_device *dev) |
343 | { |
344 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
345 | |
346 | return (priv->interrupt_mask & INTERRUPT_MASK_RX) |
347 | ? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask |
348 | & ~INTERRUPT_MASK_RX) : 0; |
349 | } |
350 | |
351 | int ps3_vuart_disable_interrupt_disconnect(struct ps3_system_bus_device *dev) |
352 | { |
353 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
354 | |
355 | return (priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT) |
356 | ? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask |
357 | & ~INTERRUPT_MASK_DISCONNECT) : 0; |
358 | } |
359 | |
360 | /** |
361 | * ps3_vuart_raw_write - Low level write helper. |
362 | * @dev: The struct ps3_system_bus_device instance. |
363 | * |
364 | * Do not call ps3_vuart_raw_write directly, use ps3_vuart_write. |
365 | */ |
366 | |
367 | static int ps3_vuart_raw_write(struct ps3_system_bus_device *dev, |
368 | const void *buf, unsigned int bytes, u64 *bytes_written) |
369 | { |
370 | int result; |
371 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
372 | |
373 | result = lv1_write_virtual_uart(dev->port_number, |
374 | ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_written); |
375 | |
376 | if (result) { |
377 | dev_dbg(&dev->core, "%s:%d: lv1_write_virtual_uart failed: " |
378 | "%s\n", __func__, __LINE__, ps3_result(result)); |
379 | return result; |
380 | } |
381 | |
382 | priv->stats.bytes_written += *bytes_written; |
383 | |
384 | dev_dbg(&dev->core, "%s:%d: wrote %llxh/%xh=>%lxh\n", __func__, __LINE__, |
385 | *bytes_written, bytes, priv->stats.bytes_written); |
386 | |
387 | return result; |
388 | } |
389 | |
390 | /** |
391 | * ps3_vuart_raw_read - Low level read helper. |
392 | * @dev: The struct ps3_system_bus_device instance. |
393 | * |
394 | * Do not call ps3_vuart_raw_read directly, use ps3_vuart_read. |
395 | */ |
396 | |
397 | static int ps3_vuart_raw_read(struct ps3_system_bus_device *dev, void *buf, |
398 | unsigned int bytes, u64 *bytes_read) |
399 | { |
400 | int result; |
401 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
402 | |
403 | dev_dbg(&dev->core, "%s:%d: %xh\n", __func__, __LINE__, bytes); |
404 | |
405 | result = lv1_read_virtual_uart(dev->port_number, |
406 | ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_read); |
407 | |
408 | if (result) { |
409 | dev_dbg(&dev->core, "%s:%d: lv1_read_virtual_uart failed: %s\n", |
410 | __func__, __LINE__, ps3_result(result)); |
411 | return result; |
412 | } |
413 | |
414 | priv->stats.bytes_read += *bytes_read; |
415 | |
416 | dev_dbg(&dev->core, "%s:%d: read %llxh/%xh=>%lxh\n", __func__, __LINE__, |
417 | *bytes_read, bytes, priv->stats.bytes_read); |
418 | |
419 | return result; |
420 | } |
421 | |
422 | /** |
423 | * ps3_vuart_clear_rx_bytes - Discard bytes received. |
424 | * @dev: The struct ps3_system_bus_device instance. |
425 | * @bytes: Max byte count to discard, zero = all pending. |
426 | * |
427 | * Used to clear pending rx interrupt source. Will not block. |
428 | */ |
429 | |
430 | void ps3_vuart_clear_rx_bytes(struct ps3_system_bus_device *dev, |
431 | unsigned int bytes) |
432 | { |
433 | int result; |
434 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
435 | u64 bytes_waiting; |
436 | void *tmp; |
437 | |
438 | result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes_waiting); |
439 | |
440 | BUG_ON(result); |
441 | |
442 | bytes = bytes ? min(bytes, (unsigned int)bytes_waiting) : bytes_waiting; |
443 | |
444 | dev_dbg(&dev->core, "%s:%d: %u\n", __func__, __LINE__, bytes); |
445 | |
446 | if (!bytes) |
447 | return; |
448 | |
449 | /* Add some extra space for recently arrived data. */ |
450 | |
451 | bytes += 128; |
452 | |
453 | tmp = kmalloc(bytes, GFP_KERNEL); |
454 | |
455 | if (!tmp) |
456 | return; |
457 | |
458 | ps3_vuart_raw_read(dev, tmp, bytes, &bytes_waiting); |
459 | |
460 | kfree(tmp); |
461 | |
462 | /* Don't include these bytes in the stats. */ |
463 | |
464 | priv->stats.bytes_read -= bytes_waiting; |
465 | } |
466 | EXPORT_SYMBOL_GPL(ps3_vuart_clear_rx_bytes); |
467 | |
468 | /** |
469 | * struct list_buffer - An element for a port device fifo buffer list. |
470 | */ |
471 | |
472 | struct list_buffer { |
473 | struct list_head link; |
474 | const unsigned char *head; |
475 | const unsigned char *tail; |
476 | unsigned long dbg_number; |
477 | unsigned char data[]; |
478 | }; |
479 | |
480 | /** |
481 | * ps3_vuart_write - the entry point for writing data to a port |
482 | * @dev: The struct ps3_system_bus_device instance. |
483 | * |
484 | * If the port is idle on entry as much of the incoming data is written to |
485 | * the port as the port will accept. Otherwise a list buffer is created |
486 | * and any remaning incoming data is copied to that buffer. The buffer is |
487 | * then enqueued for transmision via the transmit interrupt. |
488 | */ |
489 | |
490 | int ps3_vuart_write(struct ps3_system_bus_device *dev, const void *buf, |
491 | unsigned int bytes) |
492 | { |
493 | static unsigned long dbg_number; |
494 | int result; |
495 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
496 | unsigned long flags; |
497 | struct list_buffer *lb; |
498 | |
499 | dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__, |
500 | bytes, bytes); |
501 | |
502 | spin_lock_irqsave(&priv->tx_list.lock, flags); |
503 | |
504 | if (list_empty(&priv->tx_list.head)) { |
505 | u64 bytes_written; |
506 | |
507 | result = ps3_vuart_raw_write(dev, buf, bytes, &bytes_written); |
508 | |
509 | spin_unlock_irqrestore(&priv->tx_list.lock, flags); |
510 | |
511 | if (result) { |
512 | dev_dbg(&dev->core, |
513 | "%s:%d: ps3_vuart_raw_write failed\n", |
514 | __func__, __LINE__); |
515 | return result; |
516 | } |
517 | |
518 | if (bytes_written == bytes) { |
519 | dev_dbg(&dev->core, "%s:%d: wrote %xh bytes\n", |
520 | __func__, __LINE__, bytes); |
521 | return 0; |
522 | } |
523 | |
524 | bytes -= bytes_written; |
525 | buf += bytes_written; |
526 | } else |
527 | spin_unlock_irqrestore(&priv->tx_list.lock, flags); |
528 | |
529 | lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_KERNEL); |
530 | |
531 | if (!lb) |
532 | return -ENOMEM; |
533 | |
534 | memcpy(lb->data, buf, bytes); |
535 | lb->head = lb->data; |
536 | lb->tail = lb->data + bytes; |
537 | lb->dbg_number = ++dbg_number; |
538 | |
539 | spin_lock_irqsave(&priv->tx_list.lock, flags); |
540 | list_add_tail(&lb->link, &priv->tx_list.head); |
541 | ps3_vuart_enable_interrupt_tx(dev); |
542 | spin_unlock_irqrestore(&priv->tx_list.lock, flags); |
543 | |
544 | dev_dbg(&dev->core, "%s:%d: queued buf_%lu, %xh bytes\n", |
545 | __func__, __LINE__, lb->dbg_number, bytes); |
546 | |
547 | return 0; |
548 | } |
549 | EXPORT_SYMBOL_GPL(ps3_vuart_write); |
550 | |
551 | /** |
552 | * ps3_vuart_queue_rx_bytes - Queue waiting bytes into the buffer list. |
553 | * @dev: The struct ps3_system_bus_device instance. |
554 | * @bytes_queued: Number of bytes queued to the buffer list. |
555 | * |
556 | * Must be called with priv->rx_list.lock held. |
557 | */ |
558 | |
559 | static int ps3_vuart_queue_rx_bytes(struct ps3_system_bus_device *dev, |
560 | u64 *bytes_queued) |
561 | { |
562 | static unsigned long dbg_number; |
563 | int result; |
564 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
565 | struct list_buffer *lb; |
566 | u64 bytes; |
567 | |
568 | *bytes_queued = 0; |
569 | |
570 | result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes); |
571 | BUG_ON(result); |
572 | |
573 | if (result) |
574 | return -EIO; |
575 | |
576 | if (!bytes) |
577 | return 0; |
578 | |
579 | /* Add some extra space for recently arrived data. */ |
580 | |
581 | bytes += 128; |
582 | |
583 | lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_ATOMIC); |
584 | |
585 | if (!lb) |
586 | return -ENOMEM; |
587 | |
588 | ps3_vuart_raw_read(dev, lb->data, bytes, &bytes); |
589 | |
590 | lb->head = lb->data; |
591 | lb->tail = lb->data + bytes; |
592 | lb->dbg_number = ++dbg_number; |
593 | |
594 | list_add_tail(&lb->link, &priv->rx_list.head); |
595 | priv->rx_list.bytes_held += bytes; |
596 | |
597 | dev_dbg(&dev->core, "%s:%d: buf_%lu: queued %llxh bytes\n", |
598 | __func__, __LINE__, lb->dbg_number, bytes); |
599 | |
600 | *bytes_queued = bytes; |
601 | |
602 | return 0; |
603 | } |
604 | |
605 | /** |
606 | * ps3_vuart_read - The entry point for reading data from a port. |
607 | * |
608 | * Queue data waiting at the port, and if enough bytes to satisfy the request |
609 | * are held in the buffer list those bytes are dequeued and copied to the |
610 | * caller's buffer. Emptied list buffers are retiered. If the request cannot |
611 | * be statified by bytes held in the list buffers -EAGAIN is returned. |
612 | */ |
613 | |
614 | int ps3_vuart_read(struct ps3_system_bus_device *dev, void *buf, |
615 | unsigned int bytes) |
616 | { |
617 | int result; |
618 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
619 | unsigned long flags; |
620 | struct list_buffer *lb, *n; |
621 | unsigned long bytes_read; |
622 | |
623 | dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__, |
624 | bytes, bytes); |
625 | |
626 | spin_lock_irqsave(&priv->rx_list.lock, flags); |
627 | |
628 | /* Queue rx bytes here for polled reads. */ |
629 | |
630 | while (priv->rx_list.bytes_held < bytes) { |
631 | u64 tmp; |
632 | |
633 | result = ps3_vuart_queue_rx_bytes(dev, &tmp); |
634 | if (result || !tmp) { |
635 | dev_dbg(&dev->core, "%s:%d: starved for %lxh bytes\n", |
636 | __func__, __LINE__, |
637 | bytes - priv->rx_list.bytes_held); |
638 | spin_unlock_irqrestore(&priv->rx_list.lock, flags); |
639 | return -EAGAIN; |
640 | } |
641 | } |
642 | |
643 | list_for_each_entry_safe(lb, n, &priv->rx_list.head, link) { |
644 | bytes_read = min((unsigned int)(lb->tail - lb->head), bytes); |
645 | |
646 | memcpy(buf, lb->head, bytes_read); |
647 | buf += bytes_read; |
648 | bytes -= bytes_read; |
649 | priv->rx_list.bytes_held -= bytes_read; |
650 | |
651 | if (bytes_read < lb->tail - lb->head) { |
652 | lb->head += bytes_read; |
653 | dev_dbg(&dev->core, "%s:%d: buf_%lu: dequeued %lxh " |
654 | "bytes\n", __func__, __LINE__, lb->dbg_number, |
655 | bytes_read); |
656 | spin_unlock_irqrestore(&priv->rx_list.lock, flags); |
657 | return 0; |
658 | } |
659 | |
660 | dev_dbg(&dev->core, "%s:%d: buf_%lu: free, dequeued %lxh " |
661 | "bytes\n", __func__, __LINE__, lb->dbg_number, |
662 | bytes_read); |
663 | |
664 | list_del(&lb->link); |
665 | kfree(lb); |
666 | } |
667 | |
668 | spin_unlock_irqrestore(&priv->rx_list.lock, flags); |
669 | return 0; |
670 | } |
671 | EXPORT_SYMBOL_GPL(ps3_vuart_read); |
672 | |
673 | /** |
674 | * ps3_vuart_work - Asynchronous read handler. |
675 | */ |
676 | |
677 | static void ps3_vuart_work(struct work_struct *work) |
678 | { |
679 | struct ps3_system_bus_device *dev = |
680 | ps3_vuart_work_to_system_bus_dev(work); |
681 | struct ps3_vuart_port_driver *drv = |
682 | ps3_system_bus_dev_to_vuart_drv(dev); |
683 | |
684 | BUG_ON(!drv); |
685 | drv->work(dev); |
686 | } |
687 | |
688 | int ps3_vuart_read_async(struct ps3_system_bus_device *dev, unsigned int bytes) |
689 | { |
690 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
691 | unsigned long flags; |
692 | |
693 | if (priv->rx_list.work.trigger) { |
694 | dev_dbg(&dev->core, "%s:%d: warning, multiple calls\n", |
695 | __func__, __LINE__); |
696 | return -EAGAIN; |
697 | } |
698 | |
699 | BUG_ON(!bytes); |
700 | |
701 | PREPARE_WORK(&priv->rx_list.work.work, ps3_vuart_work); |
702 | |
703 | spin_lock_irqsave(&priv->rx_list.lock, flags); |
704 | if (priv->rx_list.bytes_held >= bytes) { |
705 | dev_dbg(&dev->core, "%s:%d: schedule_work %xh bytes\n", |
706 | __func__, __LINE__, bytes); |
707 | schedule_work(&priv->rx_list.work.work); |
708 | spin_unlock_irqrestore(&priv->rx_list.lock, flags); |
709 | return 0; |
710 | } |
711 | |
712 | priv->rx_list.work.trigger = bytes; |
713 | spin_unlock_irqrestore(&priv->rx_list.lock, flags); |
714 | |
715 | dev_dbg(&dev->core, "%s:%d: waiting for %u(%xh) bytes\n", __func__, |
716 | __LINE__, bytes, bytes); |
717 | |
718 | return 0; |
719 | } |
720 | EXPORT_SYMBOL_GPL(ps3_vuart_read_async); |
721 | |
722 | void ps3_vuart_cancel_async(struct ps3_system_bus_device *dev) |
723 | { |
724 | to_port_priv(dev)->rx_list.work.trigger = 0; |
725 | } |
726 | EXPORT_SYMBOL_GPL(ps3_vuart_cancel_async); |
727 | |
728 | /** |
729 | * ps3_vuart_handle_interrupt_tx - third stage transmit interrupt handler |
730 | * |
731 | * Services the transmit interrupt for the port. Writes as much data from the |
732 | * buffer list as the port will accept. Retires any emptied list buffers and |
733 | * adjusts the final list buffer state for a partial write. |
734 | */ |
735 | |
736 | static int ps3_vuart_handle_interrupt_tx(struct ps3_system_bus_device *dev) |
737 | { |
738 | int result = 0; |
739 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
740 | unsigned long flags; |
741 | struct list_buffer *lb, *n; |
742 | unsigned long bytes_total = 0; |
743 | |
744 | dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__); |
745 | |
746 | spin_lock_irqsave(&priv->tx_list.lock, flags); |
747 | |
748 | list_for_each_entry_safe(lb, n, &priv->tx_list.head, link) { |
749 | |
750 | u64 bytes_written; |
751 | |
752 | result = ps3_vuart_raw_write(dev, lb->head, lb->tail - lb->head, |
753 | &bytes_written); |
754 | |
755 | if (result) { |
756 | dev_dbg(&dev->core, |
757 | "%s:%d: ps3_vuart_raw_write failed\n", |
758 | __func__, __LINE__); |
759 | break; |
760 | } |
761 | |
762 | bytes_total += bytes_written; |
763 | |
764 | if (bytes_written < lb->tail - lb->head) { |
765 | lb->head += bytes_written; |
766 | dev_dbg(&dev->core, |
767 | "%s:%d cleared buf_%lu, %llxh bytes\n", |
768 | __func__, __LINE__, lb->dbg_number, |
769 | bytes_written); |
770 | goto port_full; |
771 | } |
772 | |
773 | dev_dbg(&dev->core, "%s:%d free buf_%lu\n", __func__, __LINE__, |
774 | lb->dbg_number); |
775 | |
776 | list_del(&lb->link); |
777 | kfree(lb); |
778 | } |
779 | |
780 | ps3_vuart_disable_interrupt_tx(dev); |
781 | port_full: |
782 | spin_unlock_irqrestore(&priv->tx_list.lock, flags); |
783 | dev_dbg(&dev->core, "%s:%d wrote %lxh bytes total\n", |
784 | __func__, __LINE__, bytes_total); |
785 | return result; |
786 | } |
787 | |
788 | /** |
789 | * ps3_vuart_handle_interrupt_rx - third stage receive interrupt handler |
790 | * |
791 | * Services the receive interrupt for the port. Creates a list buffer and |
792 | * copies all waiting port data to that buffer and enqueues the buffer in the |
793 | * buffer list. Buffer list data is dequeued via ps3_vuart_read. |
794 | */ |
795 | |
796 | static int ps3_vuart_handle_interrupt_rx(struct ps3_system_bus_device *dev) |
797 | { |
798 | int result; |
799 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
800 | unsigned long flags; |
801 | u64 bytes; |
802 | |
803 | dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__); |
804 | |
805 | spin_lock_irqsave(&priv->rx_list.lock, flags); |
806 | result = ps3_vuart_queue_rx_bytes(dev, &bytes); |
807 | |
808 | if (result) { |
809 | spin_unlock_irqrestore(&priv->rx_list.lock, flags); |
810 | return result; |
811 | } |
812 | |
813 | if (priv->rx_list.work.trigger && priv->rx_list.bytes_held |
814 | >= priv->rx_list.work.trigger) { |
815 | dev_dbg(&dev->core, "%s:%d: schedule_work %lxh bytes\n", |
816 | __func__, __LINE__, priv->rx_list.work.trigger); |
817 | priv->rx_list.work.trigger = 0; |
818 | schedule_work(&priv->rx_list.work.work); |
819 | } |
820 | |
821 | spin_unlock_irqrestore(&priv->rx_list.lock, flags); |
822 | return result; |
823 | } |
824 | |
825 | static int ps3_vuart_handle_interrupt_disconnect( |
826 | struct ps3_system_bus_device *dev) |
827 | { |
828 | dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__); |
829 | BUG_ON("no support"); |
830 | return -1; |
831 | } |
832 | |
833 | /** |
834 | * ps3_vuart_handle_port_interrupt - second stage interrupt handler |
835 | * |
836 | * Services any pending interrupt types for the port. Passes control to the |
837 | * third stage type specific interrupt handler. Returns control to the first |
838 | * stage handler after one iteration. |
839 | */ |
840 | |
841 | static int ps3_vuart_handle_port_interrupt(struct ps3_system_bus_device *dev) |
842 | { |
843 | int result; |
844 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
845 | unsigned long status; |
846 | |
847 | result = ps3_vuart_get_interrupt_status(dev, &status); |
848 | |
849 | if (result) |
850 | return result; |
851 | |
852 | dev_dbg(&dev->core, "%s:%d: status: %lxh\n", __func__, __LINE__, |
853 | status); |
854 | |
855 | if (status & INTERRUPT_MASK_DISCONNECT) { |
856 | priv->stats.disconnect_interrupts++; |
857 | result = ps3_vuart_handle_interrupt_disconnect(dev); |
858 | if (result) |
859 | ps3_vuart_disable_interrupt_disconnect(dev); |
860 | } |
861 | |
862 | if (status & INTERRUPT_MASK_TX) { |
863 | priv->stats.tx_interrupts++; |
864 | result = ps3_vuart_handle_interrupt_tx(dev); |
865 | if (result) |
866 | ps3_vuart_disable_interrupt_tx(dev); |
867 | } |
868 | |
869 | if (status & INTERRUPT_MASK_RX) { |
870 | priv->stats.rx_interrupts++; |
871 | result = ps3_vuart_handle_interrupt_rx(dev); |
872 | if (result) |
873 | ps3_vuart_disable_interrupt_rx(dev); |
874 | } |
875 | |
876 | return 0; |
877 | } |
878 | |
879 | struct vuart_bus_priv { |
880 | struct ports_bmp *bmp; |
881 | unsigned int virq; |
882 | struct mutex probe_mutex; |
883 | int use_count; |
884 | struct ps3_system_bus_device *devices[PORT_COUNT]; |
885 | } static vuart_bus_priv; |
886 | |
887 | /** |
888 | * ps3_vuart_irq_handler - first stage interrupt handler |
889 | * |
890 | * Loops finding any interrupting port and its associated instance data. |
891 | * Passes control to the second stage port specific interrupt handler. Loops |
892 | * until all outstanding interrupts are serviced. |
893 | */ |
894 | |
895 | static irqreturn_t ps3_vuart_irq_handler(int irq, void *_private) |
896 | { |
897 | struct vuart_bus_priv *bus_priv = _private; |
898 | |
899 | BUG_ON(!bus_priv); |
900 | |
901 | while (1) { |
902 | unsigned int port; |
903 | |
904 | dump_ports_bmp(bus_priv->bmp); |
905 | |
906 | port = (BITS_PER_LONG - 1) - __ilog2(bus_priv->bmp->status); |
907 | |
908 | if (port == BITS_PER_LONG) |
909 | break; |
910 | |
911 | BUG_ON(port >= PORT_COUNT); |
912 | BUG_ON(!bus_priv->devices[port]); |
913 | |
914 | ps3_vuart_handle_port_interrupt(bus_priv->devices[port]); |
915 | } |
916 | |
917 | return IRQ_HANDLED; |
918 | } |
919 | |
920 | static int ps3_vuart_bus_interrupt_get(void) |
921 | { |
922 | int result; |
923 | |
924 | pr_debug(" -> %s:%d\n", __func__, __LINE__); |
925 | |
926 | vuart_bus_priv.use_count++; |
927 | |
928 | BUG_ON(vuart_bus_priv.use_count > 2); |
929 | |
930 | if (vuart_bus_priv.use_count != 1) |
931 | return 0; |
932 | |
933 | BUG_ON(vuart_bus_priv.bmp); |
934 | |
935 | vuart_bus_priv.bmp = kzalloc(sizeof(struct ports_bmp), GFP_KERNEL); |
936 | |
937 | if (!vuart_bus_priv.bmp) { |
938 | pr_debug("%s:%d: kzalloc failed.\n", __func__, __LINE__); |
939 | result = -ENOMEM; |
940 | goto fail_bmp_malloc; |
941 | } |
942 | |
943 | result = ps3_vuart_irq_setup(PS3_BINDING_CPU_ANY, vuart_bus_priv.bmp, |
944 | &vuart_bus_priv.virq); |
945 | |
946 | if (result) { |
947 | pr_debug("%s:%d: ps3_vuart_irq_setup failed (%d)\n", |
948 | __func__, __LINE__, result); |
949 | result = -EPERM; |
950 | goto fail_alloc_irq; |
951 | } |
952 | |
953 | result = request_irq(vuart_bus_priv.virq, ps3_vuart_irq_handler, |
954 | IRQF_DISABLED, "vuart", &vuart_bus_priv); |
955 | |
956 | if (result) { |
957 | pr_debug("%s:%d: request_irq failed (%d)\n", |
958 | __func__, __LINE__, result); |
959 | goto fail_request_irq; |
960 | } |
961 | |
962 | pr_debug(" <- %s:%d: ok\n", __func__, __LINE__); |
963 | return result; |
964 | |
965 | fail_request_irq: |
966 | ps3_vuart_irq_destroy(vuart_bus_priv.virq); |
967 | vuart_bus_priv.virq = NO_IRQ; |
968 | fail_alloc_irq: |
969 | kfree(vuart_bus_priv.bmp); |
970 | vuart_bus_priv.bmp = NULL; |
971 | fail_bmp_malloc: |
972 | vuart_bus_priv.use_count--; |
973 | pr_debug(" <- %s:%d: failed\n", __func__, __LINE__); |
974 | return result; |
975 | } |
976 | |
977 | static int ps3_vuart_bus_interrupt_put(void) |
978 | { |
979 | pr_debug(" -> %s:%d\n", __func__, __LINE__); |
980 | |
981 | vuart_bus_priv.use_count--; |
982 | |
983 | BUG_ON(vuart_bus_priv.use_count < 0); |
984 | |
985 | if (vuart_bus_priv.use_count != 0) |
986 | return 0; |
987 | |
988 | free_irq(vuart_bus_priv.virq, &vuart_bus_priv); |
989 | |
990 | ps3_vuart_irq_destroy(vuart_bus_priv.virq); |
991 | vuart_bus_priv.virq = NO_IRQ; |
992 | |
993 | kfree(vuart_bus_priv.bmp); |
994 | vuart_bus_priv.bmp = NULL; |
995 | |
996 | pr_debug(" <- %s:%d\n", __func__, __LINE__); |
997 | return 0; |
998 | } |
999 | |
1000 | static int ps3_vuart_probe(struct ps3_system_bus_device *dev) |
1001 | { |
1002 | int result; |
1003 | struct ps3_vuart_port_driver *drv; |
1004 | struct ps3_vuart_port_priv *priv = NULL; |
1005 | |
1006 | dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__); |
1007 | |
1008 | drv = ps3_system_bus_dev_to_vuart_drv(dev); |
1009 | |
1010 | dev_dbg(&dev->core, "%s:%d: (%s)\n", __func__, __LINE__, |
1011 | drv->core.core.name); |
1012 | |
1013 | BUG_ON(!drv); |
1014 | |
1015 | if (dev->port_number >= PORT_COUNT) { |
1016 | BUG(); |
1017 | return -EINVAL; |
1018 | } |
1019 | |
1020 | mutex_lock(&vuart_bus_priv.probe_mutex); |
1021 | |
1022 | result = ps3_vuart_bus_interrupt_get(); |
1023 | |
1024 | if (result) |
1025 | goto fail_setup_interrupt; |
1026 | |
1027 | if (vuart_bus_priv.devices[dev->port_number]) { |
1028 | dev_dbg(&dev->core, "%s:%d: port busy (%d)\n", __func__, |
1029 | __LINE__, dev->port_number); |
1030 | result = -EBUSY; |
1031 | goto fail_busy; |
1032 | } |
1033 | |
1034 | vuart_bus_priv.devices[dev->port_number] = dev; |
1035 | |
1036 | /* Setup dev->driver_priv. */ |
1037 | |
1038 | dev->driver_priv = kzalloc(sizeof(struct ps3_vuart_port_priv), |
1039 | GFP_KERNEL); |
1040 | |
1041 | if (!dev->driver_priv) { |
1042 | result = -ENOMEM; |
1043 | goto fail_dev_malloc; |
1044 | } |
1045 | |
1046 | priv = to_port_priv(dev); |
1047 | |
1048 | INIT_LIST_HEAD(&priv->tx_list.head); |
1049 | spin_lock_init(&priv->tx_list.lock); |
1050 | |
1051 | INIT_LIST_HEAD(&priv->rx_list.head); |
1052 | spin_lock_init(&priv->rx_list.lock); |
1053 | |
1054 | INIT_WORK(&priv->rx_list.work.work, NULL); |
1055 | priv->rx_list.work.trigger = 0; |
1056 | priv->rx_list.work.dev = dev; |
1057 | |
1058 | /* clear stale pending interrupts */ |
1059 | |
1060 | ps3_vuart_clear_rx_bytes(dev, 0); |
1061 | |
1062 | ps3_vuart_set_interrupt_mask(dev, INTERRUPT_MASK_RX); |
1063 | |
1064 | ps3_vuart_set_triggers(dev, 1, 1); |
1065 | |
1066 | if (drv->probe) |
1067 | result = drv->probe(dev); |
1068 | else { |
1069 | result = 0; |
1070 | dev_info(&dev->core, "%s:%d: no probe method\n", __func__, |
1071 | __LINE__); |
1072 | } |
1073 | |
1074 | if (result) { |
1075 | dev_dbg(&dev->core, "%s:%d: drv->probe failed\n", |
1076 | __func__, __LINE__); |
1077 | goto fail_probe; |
1078 | } |
1079 | |
1080 | mutex_unlock(&vuart_bus_priv.probe_mutex); |
1081 | |
1082 | return result; |
1083 | |
1084 | fail_probe: |
1085 | ps3_vuart_set_interrupt_mask(dev, 0); |
1086 | kfree(dev->driver_priv); |
1087 | dev->driver_priv = NULL; |
1088 | fail_dev_malloc: |
1089 | vuart_bus_priv.devices[dev->port_number] = NULL; |
1090 | fail_busy: |
1091 | ps3_vuart_bus_interrupt_put(); |
1092 | fail_setup_interrupt: |
1093 | mutex_unlock(&vuart_bus_priv.probe_mutex); |
1094 | dev_dbg(&dev->core, "%s:%d: failed\n", __func__, __LINE__); |
1095 | return result; |
1096 | } |
1097 | |
1098 | /** |
1099 | * ps3_vuart_cleanup - common cleanup helper. |
1100 | * @dev: The struct ps3_system_bus_device instance. |
1101 | * |
1102 | * Cleans interrupts and HV resources. Must be called with |
1103 | * vuart_bus_priv.probe_mutex held. Used by ps3_vuart_remove and |
1104 | * ps3_vuart_shutdown. After this call, polled reading will still work. |
1105 | */ |
1106 | |
1107 | static int ps3_vuart_cleanup(struct ps3_system_bus_device *dev) |
1108 | { |
1109 | dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__); |
1110 | |
1111 | ps3_vuart_cancel_async(dev); |
1112 | ps3_vuart_set_interrupt_mask(dev, 0); |
1113 | ps3_vuart_bus_interrupt_put(); |
1114 | return 0; |
1115 | } |
1116 | |
1117 | /** |
1118 | * ps3_vuart_remove - Completely clean the device instance. |
1119 | * @dev: The struct ps3_system_bus_device instance. |
1120 | * |
1121 | * Cleans all memory, interrupts and HV resources. After this call the |
1122 | * device can no longer be used. |
1123 | */ |
1124 | |
1125 | static int ps3_vuart_remove(struct ps3_system_bus_device *dev) |
1126 | { |
1127 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
1128 | struct ps3_vuart_port_driver *drv; |
1129 | |
1130 | BUG_ON(!dev); |
1131 | |
1132 | mutex_lock(&vuart_bus_priv.probe_mutex); |
1133 | |
1134 | dev_dbg(&dev->core, " -> %s:%d: match_id %d\n", __func__, __LINE__, |
1135 | dev->match_id); |
1136 | |
1137 | if (!dev->core.driver) { |
1138 | dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__, |
1139 | __LINE__); |
1140 | mutex_unlock(&vuart_bus_priv.probe_mutex); |
1141 | return 0; |
1142 | } |
1143 | |
1144 | drv = ps3_system_bus_dev_to_vuart_drv(dev); |
1145 | |
1146 | BUG_ON(!drv); |
1147 | |
1148 | if (drv->remove) { |
1149 | drv->remove(dev); |
1150 | } else { |
1151 | dev_dbg(&dev->core, "%s:%d: no remove method\n", __func__, |
1152 | __LINE__); |
1153 | BUG(); |
1154 | } |
1155 | |
1156 | ps3_vuart_cleanup(dev); |
1157 | |
1158 | vuart_bus_priv.devices[dev->port_number] = NULL; |
1159 | kfree(priv); |
1160 | priv = NULL; |
1161 | |
1162 | dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__); |
1163 | mutex_unlock(&vuart_bus_priv.probe_mutex); |
1164 | return 0; |
1165 | } |
1166 | |
1167 | /** |
1168 | * ps3_vuart_shutdown - Cleans interrupts and HV resources. |
1169 | * @dev: The struct ps3_system_bus_device instance. |
1170 | * |
1171 | * Cleans interrupts and HV resources. After this call the |
1172 | * device can still be used in polling mode. This behavior required |
1173 | * by sys-manager to be able to complete the device power operation |
1174 | * sequence. |
1175 | */ |
1176 | |
1177 | static int ps3_vuart_shutdown(struct ps3_system_bus_device *dev) |
1178 | { |
1179 | struct ps3_vuart_port_driver *drv; |
1180 | |
1181 | BUG_ON(!dev); |
1182 | |
1183 | mutex_lock(&vuart_bus_priv.probe_mutex); |
1184 | |
1185 | dev_dbg(&dev->core, " -> %s:%d: match_id %d\n", __func__, __LINE__, |
1186 | dev->match_id); |
1187 | |
1188 | if (!dev->core.driver) { |
1189 | dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__, |
1190 | __LINE__); |
1191 | mutex_unlock(&vuart_bus_priv.probe_mutex); |
1192 | return 0; |
1193 | } |
1194 | |
1195 | drv = ps3_system_bus_dev_to_vuart_drv(dev); |
1196 | |
1197 | BUG_ON(!drv); |
1198 | |
1199 | if (drv->shutdown) |
1200 | drv->shutdown(dev); |
1201 | else if (drv->remove) { |
1202 | dev_dbg(&dev->core, "%s:%d: no shutdown, calling remove\n", |
1203 | __func__, __LINE__); |
1204 | drv->remove(dev); |
1205 | } else { |
1206 | dev_dbg(&dev->core, "%s:%d: no shutdown method\n", __func__, |
1207 | __LINE__); |
1208 | BUG(); |
1209 | } |
1210 | |
1211 | ps3_vuart_cleanup(dev); |
1212 | |
1213 | dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__); |
1214 | |
1215 | mutex_unlock(&vuart_bus_priv.probe_mutex); |
1216 | return 0; |
1217 | } |
1218 | |
1219 | static int __init ps3_vuart_bus_init(void) |
1220 | { |
1221 | pr_debug("%s:%d:\n", __func__, __LINE__); |
1222 | |
1223 | if (!firmware_has_feature(FW_FEATURE_PS3_LV1)) |
1224 | return -ENODEV; |
1225 | |
1226 | mutex_init(&vuart_bus_priv.probe_mutex); |
1227 | |
1228 | return 0; |
1229 | } |
1230 | |
1231 | static void __exit ps3_vuart_bus_exit(void) |
1232 | { |
1233 | pr_debug("%s:%d:\n", __func__, __LINE__); |
1234 | } |
1235 | |
1236 | core_initcall(ps3_vuart_bus_init); |
1237 | module_exit(ps3_vuart_bus_exit); |
1238 | |
1239 | /** |
1240 | * ps3_vuart_port_driver_register - Add a vuart port device driver. |
1241 | */ |
1242 | |
1243 | int ps3_vuart_port_driver_register(struct ps3_vuart_port_driver *drv) |
1244 | { |
1245 | int result; |
1246 | |
1247 | pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.core.name); |
1248 | |
1249 | BUG_ON(!drv->core.match_id); |
1250 | BUG_ON(!drv->core.core.name); |
1251 | |
1252 | drv->core.probe = ps3_vuart_probe; |
1253 | drv->core.remove = ps3_vuart_remove; |
1254 | drv->core.shutdown = ps3_vuart_shutdown; |
1255 | |
1256 | result = ps3_system_bus_driver_register(&drv->core); |
1257 | return result; |
1258 | } |
1259 | EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_register); |
1260 | |
1261 | /** |
1262 | * ps3_vuart_port_driver_unregister - Remove a vuart port device driver. |
1263 | */ |
1264 | |
1265 | void ps3_vuart_port_driver_unregister(struct ps3_vuart_port_driver *drv) |
1266 | { |
1267 | pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.core.name); |
1268 | ps3_system_bus_driver_unregister(&drv->core); |
1269 | } |
1270 | EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_unregister); |
1271 |
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