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authorGeert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>2007-11-28 19:21:11 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-11-29 12:24:51 -0500
commit248285501ea251379dd449316bf5af78362ae638 (patch)
treeee2fbe2125f9a5bb596e1337b64ee3b7a6cbe6ad /drivers/ps3/vuart.c
parent65f97a56944b797f5df714d677b541cca0829669 (diff)
ps3: prefix all ps3-specific kernel modules with `ps3-'
- vuart.ko -> ps3-vuart.ko - sys-manager.ko -> ps3-sys-manager.ko Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/ps3/vuart.c')
-rw-r--r--drivers/ps3/vuart.c1271
1 files changed, 0 insertions, 1271 deletions
diff --git a/drivers/ps3/vuart.c b/drivers/ps3/vuart.c
deleted file mode 100644
index 9dea585ef806..000000000000
--- a/drivers/ps3/vuart.c
+++ /dev/null
@@ -1,1271 +0,0 @@
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
33MODULE_AUTHOR("Sony Corporation");
34MODULE_LICENSE("GPL v2");
35MODULE_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
48enum {PORT_COUNT = 3,};
49
50enum 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
61enum vuart_interrupt_bit {
62 INTERRUPT_BIT_TX = 0,
63 INTERRUPT_BIT_RX = 1,
64 INTERRUPT_BIT_DISCONNECT = 2,
65};
66
67enum 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
77struct 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
93static 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
108struct 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__)
114static 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: %016lxh\n", func, line, bmp->status);
118}
119
120#define dump_port_params(_b) _dump_port_params(_b, __func__, __LINE__)
121static 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
153struct vuart_triggers {
154 unsigned long rx;
155 unsigned long tx;
156};
157
158int ps3_vuart_get_triggers(struct ps3_system_bus_device *dev,
159 struct vuart_triggers *trig)
160{
161 int result;
162 unsigned long size;
163 unsigned long val;
164
165 result = lv1_get_virtual_uart_param(dev->port_number,
166 PARAM_TX_TRIGGER, &trig->tx);
167
168 if (result) {
169 dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n",
170 __func__, __LINE__, ps3_result(result));
171 return result;
172 }
173
174 result = lv1_get_virtual_uart_param(dev->port_number,
175 PARAM_RX_BUF_SIZE, &size);
176
177 if (result) {
178 dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n",
179 __func__, __LINE__, ps3_result(result));
180 return result;
181 }
182
183 result = lv1_get_virtual_uart_param(dev->port_number,
184 PARAM_RX_TRIGGER, &val);
185
186 if (result) {
187 dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n",
188 __func__, __LINE__, ps3_result(result));
189 return result;
190 }
191
192 trig->rx = size - val;
193
194 dev_dbg(&dev->core, "%s:%d: tx %lxh, rx %lxh\n", __func__, __LINE__,
195 trig->tx, trig->rx);
196
197 return result;
198}
199
200int ps3_vuart_set_triggers(struct ps3_system_bus_device *dev, unsigned int tx,
201 unsigned int rx)
202{
203 int result;
204 unsigned long size;
205
206 result = lv1_set_virtual_uart_param(dev->port_number,
207 PARAM_TX_TRIGGER, tx);
208
209 if (result) {
210 dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n",
211 __func__, __LINE__, ps3_result(result));
212 return result;
213 }
214
215 result = lv1_get_virtual_uart_param(dev->port_number,
216 PARAM_RX_BUF_SIZE, &size);
217
218 if (result) {
219 dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n",
220 __func__, __LINE__, ps3_result(result));
221 return result;
222 }
223
224 result = lv1_set_virtual_uart_param(dev->port_number,
225 PARAM_RX_TRIGGER, size - rx);
226
227 if (result) {
228 dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n",
229 __func__, __LINE__, ps3_result(result));
230 return result;
231 }
232
233 dev_dbg(&dev->core, "%s:%d: tx %xh, rx %xh\n", __func__, __LINE__,
234 tx, rx);
235
236 return result;
237}
238
239static int ps3_vuart_get_rx_bytes_waiting(struct ps3_system_bus_device *dev,
240 u64 *bytes_waiting)
241{
242 int result;
243
244 result = lv1_get_virtual_uart_param(dev->port_number,
245 PARAM_RX_BYTES, bytes_waiting);
246
247 if (result)
248 dev_dbg(&dev->core, "%s:%d: rx_bytes failed: %s\n",
249 __func__, __LINE__, ps3_result(result));
250
251 dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__,
252 *bytes_waiting);
253 return result;
254}
255
256/**
257 * ps3_vuart_set_interrupt_mask - Enable/disable the port interrupt sources.
258 * @dev: The struct ps3_system_bus_device instance.
259 * @bmp: Logical OR of enum vuart_interrupt_mask values. A zero bit disables.
260 */
261
262static int ps3_vuart_set_interrupt_mask(struct ps3_system_bus_device *dev,
263 unsigned long mask)
264{
265 int result;
266 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
267
268 dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__, mask);
269
270 priv->interrupt_mask = mask;
271
272 result = lv1_set_virtual_uart_param(dev->port_number,
273 PARAM_INTERRUPT_MASK, priv->interrupt_mask);
274
275 if (result)
276 dev_dbg(&dev->core, "%s:%d: interrupt_mask failed: %s\n",
277 __func__, __LINE__, ps3_result(result));
278
279 return result;
280}
281
282static int ps3_vuart_get_interrupt_status(struct ps3_system_bus_device *dev,
283 unsigned long *status)
284{
285 int result;
286 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
287 u64 tmp;
288
289 result = lv1_get_virtual_uart_param(dev->port_number,
290 PARAM_INTERRUPT_STATUS, &tmp);
291
292 if (result)
293 dev_dbg(&dev->core, "%s:%d: interrupt_status failed: %s\n",
294 __func__, __LINE__, ps3_result(result));
295
296 *status = tmp & priv->interrupt_mask;
297
298 dev_dbg(&dev->core, "%s:%d: m %lxh, s %lxh, m&s %lxh\n",
299 __func__, __LINE__, priv->interrupt_mask, tmp, *status);
300
301 return result;
302}
303
304int ps3_vuart_enable_interrupt_tx(struct ps3_system_bus_device *dev)
305{
306 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
307
308 return (priv->interrupt_mask & INTERRUPT_MASK_TX) ? 0
309 : ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
310 | INTERRUPT_MASK_TX);
311}
312
313int ps3_vuart_enable_interrupt_rx(struct ps3_system_bus_device *dev)
314{
315 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
316
317 return (priv->interrupt_mask & INTERRUPT_MASK_RX) ? 0
318 : ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
319 | INTERRUPT_MASK_RX);
320}
321
322int ps3_vuart_enable_interrupt_disconnect(struct ps3_system_bus_device *dev)
323{
324 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
325
326 return (priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT) ? 0
327 : ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
328 | INTERRUPT_MASK_DISCONNECT);
329}
330
331int ps3_vuart_disable_interrupt_tx(struct ps3_system_bus_device *dev)
332{
333 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
334
335 return (priv->interrupt_mask & INTERRUPT_MASK_TX)
336 ? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
337 & ~INTERRUPT_MASK_TX) : 0;
338}
339
340int ps3_vuart_disable_interrupt_rx(struct ps3_system_bus_device *dev)
341{
342 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
343
344 return (priv->interrupt_mask & INTERRUPT_MASK_RX)
345 ? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
346 & ~INTERRUPT_MASK_RX) : 0;
347}
348
349int ps3_vuart_disable_interrupt_disconnect(struct ps3_system_bus_device *dev)
350{
351 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
352
353 return (priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT)
354 ? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
355 & ~INTERRUPT_MASK_DISCONNECT) : 0;
356}
357
358/**
359 * ps3_vuart_raw_write - Low level write helper.
360 * @dev: The struct ps3_system_bus_device instance.
361 *
362 * Do not call ps3_vuart_raw_write directly, use ps3_vuart_write.
363 */
364
365static int ps3_vuart_raw_write(struct ps3_system_bus_device *dev,
366 const void* buf, unsigned int bytes, unsigned long *bytes_written)
367{
368 int result;
369 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
370
371 result = lv1_write_virtual_uart(dev->port_number,
372 ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_written);
373
374 if (result) {
375 dev_dbg(&dev->core, "%s:%d: lv1_write_virtual_uart failed: "
376 "%s\n", __func__, __LINE__, ps3_result(result));
377 return result;
378 }
379
380 priv->stats.bytes_written += *bytes_written;
381
382 dev_dbg(&dev->core, "%s:%d: wrote %lxh/%xh=>%lxh\n", __func__, __LINE__,
383 *bytes_written, bytes, priv->stats.bytes_written);
384
385 return result;
386}
387
388/**
389 * ps3_vuart_raw_read - Low level read helper.
390 * @dev: The struct ps3_system_bus_device instance.
391 *
392 * Do not call ps3_vuart_raw_read directly, use ps3_vuart_read.
393 */
394
395static int ps3_vuart_raw_read(struct ps3_system_bus_device *dev, void *buf,
396 unsigned int bytes, unsigned long *bytes_read)
397{
398 int result;
399 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
400
401 dev_dbg(&dev->core, "%s:%d: %xh\n", __func__, __LINE__, bytes);
402
403 result = lv1_read_virtual_uart(dev->port_number,
404 ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_read);
405
406 if (result) {
407 dev_dbg(&dev->core, "%s:%d: lv1_read_virtual_uart failed: %s\n",
408 __func__, __LINE__, ps3_result(result));
409 return result;
410 }
411
412 priv->stats.bytes_read += *bytes_read;
413
414 dev_dbg(&dev->core, "%s:%d: read %lxh/%xh=>%lxh\n", __func__, __LINE__,
415 *bytes_read, bytes, priv->stats.bytes_read);
416
417 return result;
418}
419
420/**
421 * ps3_vuart_clear_rx_bytes - Discard bytes received.
422 * @dev: The struct ps3_system_bus_device instance.
423 * @bytes: Max byte count to discard, zero = all pending.
424 *
425 * Used to clear pending rx interrupt source. Will not block.
426 */
427
428void ps3_vuart_clear_rx_bytes(struct ps3_system_bus_device *dev,
429 unsigned int bytes)
430{
431 int result;
432 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
433 u64 bytes_waiting;
434 void* tmp;
435
436 result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes_waiting);
437
438 BUG_ON(result);
439
440 bytes = bytes ? min(bytes, (unsigned int)bytes_waiting) : bytes_waiting;
441
442 dev_dbg(&dev->core, "%s:%d: %u\n", __func__, __LINE__, bytes);
443
444 if (!bytes)
445 return;
446
447 /* Add some extra space for recently arrived data. */
448
449 bytes += 128;
450
451 tmp = kmalloc(bytes, GFP_KERNEL);
452
453 if (!tmp)
454 return;
455
456 ps3_vuart_raw_read(dev, tmp, bytes, &bytes_waiting);
457
458 kfree(tmp);
459
460 /* Don't include these bytes in the stats. */
461
462 priv->stats.bytes_read -= bytes_waiting;
463}
464EXPORT_SYMBOL_GPL(ps3_vuart_clear_rx_bytes);
465
466/**
467 * struct list_buffer - An element for a port device fifo buffer list.
468 */
469
470struct list_buffer {
471 struct list_head link;
472 const unsigned char *head;
473 const unsigned char *tail;
474 unsigned long dbg_number;
475 unsigned char data[];
476};
477
478/**
479 * ps3_vuart_write - the entry point for writing data to a port
480 * @dev: The struct ps3_system_bus_device instance.
481 *
482 * If the port is idle on entry as much of the incoming data is written to
483 * the port as the port will accept. Otherwise a list buffer is created
484 * and any remaning incoming data is copied to that buffer. The buffer is
485 * then enqueued for transmision via the transmit interrupt.
486 */
487
488int ps3_vuart_write(struct ps3_system_bus_device *dev, const void *buf,
489 unsigned int bytes)
490{
491 static unsigned long dbg_number;
492 int result;
493 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
494 unsigned long flags;
495 struct list_buffer *lb;
496
497 dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
498 bytes, bytes);
499
500 spin_lock_irqsave(&priv->tx_list.lock, flags);
501
502 if (list_empty(&priv->tx_list.head)) {
503 unsigned long bytes_written;
504
505 result = ps3_vuart_raw_write(dev, buf, bytes, &bytes_written);
506
507 spin_unlock_irqrestore(&priv->tx_list.lock, flags);
508
509 if (result) {
510 dev_dbg(&dev->core,
511 "%s:%d: ps3_vuart_raw_write failed\n",
512 __func__, __LINE__);
513 return result;
514 }
515
516 if (bytes_written == bytes) {
517 dev_dbg(&dev->core, "%s:%d: wrote %xh bytes\n",
518 __func__, __LINE__, bytes);
519 return 0;
520 }
521
522 bytes -= bytes_written;
523 buf += bytes_written;
524 } else
525 spin_unlock_irqrestore(&priv->tx_list.lock, flags);
526
527 lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_KERNEL);
528
529 if (!lb) {
530 return -ENOMEM;
531 }
532
533 memcpy(lb->data, buf, bytes);
534 lb->head = lb->data;
535 lb->tail = lb->data + bytes;
536 lb->dbg_number = ++dbg_number;
537
538 spin_lock_irqsave(&priv->tx_list.lock, flags);
539 list_add_tail(&lb->link, &priv->tx_list.head);
540 ps3_vuart_enable_interrupt_tx(dev);
541 spin_unlock_irqrestore(&priv->tx_list.lock, flags);
542
543 dev_dbg(&dev->core, "%s:%d: queued buf_%lu, %xh bytes\n",
544 __func__, __LINE__, lb->dbg_number, bytes);
545
546 return 0;
547}
548EXPORT_SYMBOL_GPL(ps3_vuart_write);
549
550/**
551 * ps3_vuart_queue_rx_bytes - Queue waiting bytes into the buffer list.
552 * @dev: The struct ps3_system_bus_device instance.
553 * @bytes_queued: Number of bytes queued to the buffer list.
554 *
555 * Must be called with priv->rx_list.lock held.
556 */
557
558static int ps3_vuart_queue_rx_bytes(struct ps3_system_bus_device *dev,
559 u64 *bytes_queued)
560{
561 static unsigned long dbg_number;
562 int result;
563 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
564 struct list_buffer *lb;
565 u64 bytes;
566
567 *bytes_queued = 0;
568
569 result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes);
570 BUG_ON(result);
571
572 if (result)
573 return -EIO;
574
575 if (!bytes)
576 return 0;
577
578 /* Add some extra space for recently arrived data. */
579
580 bytes += 128;
581
582 lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_ATOMIC);
583
584 if (!lb)
585 return -ENOMEM;
586
587 ps3_vuart_raw_read(dev, lb->data, bytes, &bytes);
588
589 lb->head = lb->data;
590 lb->tail = lb->data + bytes;
591 lb->dbg_number = ++dbg_number;
592
593 list_add_tail(&lb->link, &priv->rx_list.head);
594 priv->rx_list.bytes_held += bytes;
595
596 dev_dbg(&dev->core, "%s:%d: buf_%lu: queued %lxh bytes\n",
597 __func__, __LINE__, lb->dbg_number, bytes);
598
599 *bytes_queued = bytes;
600
601 return 0;
602}
603
604/**
605 * ps3_vuart_read - The entry point for reading data from a port.
606 *
607 * Queue data waiting at the port, and if enough bytes to satisfy the request
608 * are held in the buffer list those bytes are dequeued and copied to the
609 * caller's buffer. Emptied list buffers are retiered. If the request cannot
610 * be statified by bytes held in the list buffers -EAGAIN is returned.
611 */
612
613int ps3_vuart_read(struct ps3_system_bus_device *dev, void *buf,
614 unsigned int bytes)
615{
616 int result;
617 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
618 unsigned long flags;
619 struct list_buffer *lb, *n;
620 unsigned long bytes_read;
621
622 dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
623 bytes, bytes);
624
625 spin_lock_irqsave(&priv->rx_list.lock, flags);
626
627 /* Queue rx bytes here for polled reads. */
628
629 while (priv->rx_list.bytes_held < bytes) {
630 u64 tmp;
631
632 result = ps3_vuart_queue_rx_bytes(dev, &tmp);
633 if (result || !tmp) {
634 dev_dbg(&dev->core, "%s:%d: starved for %lxh bytes\n",
635 __func__, __LINE__,
636 bytes - priv->rx_list.bytes_held);
637 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
638 return -EAGAIN;
639 }
640 }
641
642 list_for_each_entry_safe(lb, n, &priv->rx_list.head, link) {
643 bytes_read = min((unsigned int)(lb->tail - lb->head), bytes);
644
645 memcpy(buf, lb->head, bytes_read);
646 buf += bytes_read;
647 bytes -= bytes_read;
648 priv->rx_list.bytes_held -= bytes_read;
649
650 if (bytes_read < lb->tail - lb->head) {
651 lb->head += bytes_read;
652 dev_dbg(&dev->core, "%s:%d: buf_%lu: dequeued %lxh "
653 "bytes\n", __func__, __LINE__, lb->dbg_number,
654 bytes_read);
655 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
656 return 0;
657 }
658
659 dev_dbg(&dev->core, "%s:%d: buf_%lu: free, dequeued %lxh "
660 "bytes\n", __func__, __LINE__, lb->dbg_number,
661 bytes_read);
662
663 list_del(&lb->link);
664 kfree(lb);
665 }
666
667 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
668 return 0;
669}
670EXPORT_SYMBOL_GPL(ps3_vuart_read);
671
672/**
673 * ps3_vuart_work - Asynchronous read handler.
674 */
675
676static void ps3_vuart_work(struct work_struct *work)
677{
678 struct ps3_system_bus_device *dev =
679 ps3_vuart_work_to_system_bus_dev(work);
680 struct ps3_vuart_port_driver *drv =
681 ps3_system_bus_dev_to_vuart_drv(dev);
682
683 BUG_ON(!drv);
684 drv->work(dev);
685}
686
687int ps3_vuart_read_async(struct ps3_system_bus_device *dev, unsigned int bytes)
688{
689 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
690 unsigned long flags;
691
692 if (priv->rx_list.work.trigger) {
693 dev_dbg(&dev->core, "%s:%d: warning, multiple calls\n",
694 __func__, __LINE__);
695 return -EAGAIN;
696 }
697
698 BUG_ON(!bytes);
699
700 PREPARE_WORK(&priv->rx_list.work.work, ps3_vuart_work);
701
702 spin_lock_irqsave(&priv->rx_list.lock, flags);
703 if (priv->rx_list.bytes_held >= bytes) {
704 dev_dbg(&dev->core, "%s:%d: schedule_work %xh bytes\n",
705 __func__, __LINE__, bytes);
706 schedule_work(&priv->rx_list.work.work);
707 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
708 return 0;
709 }
710
711 priv->rx_list.work.trigger = bytes;
712 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
713
714 dev_dbg(&dev->core, "%s:%d: waiting for %u(%xh) bytes\n", __func__,
715 __LINE__, bytes, bytes);
716
717 return 0;
718}
719EXPORT_SYMBOL_GPL(ps3_vuart_read_async);
720
721void ps3_vuart_cancel_async(struct ps3_system_bus_device *dev)
722{
723 to_port_priv(dev)->rx_list.work.trigger = 0;
724}
725EXPORT_SYMBOL_GPL(ps3_vuart_cancel_async);
726
727/**
728 * ps3_vuart_handle_interrupt_tx - third stage transmit interrupt handler
729 *
730 * Services the transmit interrupt for the port. Writes as much data from the
731 * buffer list as the port will accept. Retires any emptied list buffers and
732 * adjusts the final list buffer state for a partial write.
733 */
734
735static int ps3_vuart_handle_interrupt_tx(struct ps3_system_bus_device *dev)
736{
737 int result = 0;
738 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
739 unsigned long flags;
740 struct list_buffer *lb, *n;
741 unsigned long bytes_total = 0;
742
743 dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
744
745 spin_lock_irqsave(&priv->tx_list.lock, flags);
746
747 list_for_each_entry_safe(lb, n, &priv->tx_list.head, link) {
748
749 unsigned long bytes_written;
750
751 result = ps3_vuart_raw_write(dev, lb->head, lb->tail - lb->head,
752 &bytes_written);
753
754 if (result) {
755 dev_dbg(&dev->core,
756 "%s:%d: ps3_vuart_raw_write failed\n",
757 __func__, __LINE__);
758 break;
759 }
760
761 bytes_total += bytes_written;
762
763 if (bytes_written < lb->tail - lb->head) {
764 lb->head += bytes_written;
765 dev_dbg(&dev->core,
766 "%s:%d cleared buf_%lu, %lxh bytes\n",
767 __func__, __LINE__, lb->dbg_number,
768 bytes_written);
769 goto port_full;
770 }
771
772 dev_dbg(&dev->core, "%s:%d free buf_%lu\n", __func__, __LINE__,
773 lb->dbg_number);
774
775 list_del(&lb->link);
776 kfree(lb);
777 }
778
779 ps3_vuart_disable_interrupt_tx(dev);
780port_full:
781 spin_unlock_irqrestore(&priv->tx_list.lock, flags);
782 dev_dbg(&dev->core, "%s:%d wrote %lxh bytes total\n",
783 __func__, __LINE__, bytes_total);
784 return result;
785}
786
787/**
788 * ps3_vuart_handle_interrupt_rx - third stage receive interrupt handler
789 *
790 * Services the receive interrupt for the port. Creates a list buffer and
791 * copies all waiting port data to that buffer and enqueues the buffer in the
792 * buffer list. Buffer list data is dequeued via ps3_vuart_read.
793 */
794
795static int ps3_vuart_handle_interrupt_rx(struct ps3_system_bus_device *dev)
796{
797 int result;
798 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
799 unsigned long flags;
800 u64 bytes;
801
802 dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
803
804 spin_lock_irqsave(&priv->rx_list.lock, flags);
805 result = ps3_vuart_queue_rx_bytes(dev, &bytes);
806
807 if (result) {
808 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
809 return result;
810 }
811
812 if (priv->rx_list.work.trigger && priv->rx_list.bytes_held
813 >= priv->rx_list.work.trigger) {
814 dev_dbg(&dev->core, "%s:%d: schedule_work %lxh bytes\n",
815 __func__, __LINE__, priv->rx_list.work.trigger);
816 priv->rx_list.work.trigger = 0;
817 schedule_work(&priv->rx_list.work.work);
818 }
819
820 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
821 return result;
822}
823
824static int ps3_vuart_handle_interrupt_disconnect(
825 struct ps3_system_bus_device *dev)
826{
827 dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
828 BUG_ON("no support");
829 return -1;
830}
831
832/**
833 * ps3_vuart_handle_port_interrupt - second stage interrupt handler
834 *
835 * Services any pending interrupt types for the port. Passes control to the
836 * third stage type specific interrupt handler. Returns control to the first
837 * stage handler after one iteration.
838 */
839
840static int ps3_vuart_handle_port_interrupt(struct ps3_system_bus_device *dev)
841{
842 int result;
843 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
844 unsigned long status;
845
846 result = ps3_vuart_get_interrupt_status(dev, &status);
847
848 if (result)
849 return result;
850
851 dev_dbg(&dev->core, "%s:%d: status: %lxh\n", __func__, __LINE__,
852 status);
853
854 if (status & INTERRUPT_MASK_DISCONNECT) {
855 priv->stats.disconnect_interrupts++;
856 result = ps3_vuart_handle_interrupt_disconnect(dev);
857 if (result)
858 ps3_vuart_disable_interrupt_disconnect(dev);
859 }
860
861 if (status & INTERRUPT_MASK_TX) {
862 priv->stats.tx_interrupts++;
863 result = ps3_vuart_handle_interrupt_tx(dev);
864 if (result)
865 ps3_vuart_disable_interrupt_tx(dev);
866 }
867
868 if (status & INTERRUPT_MASK_RX) {
869 priv->stats.rx_interrupts++;
870 result = ps3_vuart_handle_interrupt_rx(dev);
871 if (result)
872 ps3_vuart_disable_interrupt_rx(dev);
873 }
874
875 return 0;
876}
877
878struct vuart_bus_priv {
879 struct ports_bmp *bmp;
880 unsigned int virq;
881 struct semaphore probe_mutex;
882 int use_count;
883 struct ps3_system_bus_device *devices[PORT_COUNT];
884} static vuart_bus_priv;
885
886/**
887 * ps3_vuart_irq_handler - first stage interrupt handler
888 *
889 * Loops finding any interrupting port and its associated instance data.
890 * Passes control to the second stage port specific interrupt handler. Loops
891 * until all outstanding interrupts are serviced.
892 */
893
894static irqreturn_t ps3_vuart_irq_handler(int irq, void *_private)
895{
896 struct vuart_bus_priv *bus_priv = _private;
897
898 BUG_ON(!bus_priv);
899
900 while (1) {
901 unsigned int port;
902
903 dump_ports_bmp(bus_priv->bmp);
904
905 port = (BITS_PER_LONG - 1) - __ilog2(bus_priv->bmp->status);
906
907 if (port == BITS_PER_LONG)
908 break;
909
910 BUG_ON(port >= PORT_COUNT);
911 BUG_ON(!bus_priv->devices[port]);
912
913 ps3_vuart_handle_port_interrupt(bus_priv->devices[port]);
914 }
915
916 return IRQ_HANDLED;
917}
918
919static int ps3_vuart_bus_interrupt_get(void)
920{
921 int result;
922
923 pr_debug(" -> %s:%d\n", __func__, __LINE__);
924
925 vuart_bus_priv.use_count++;
926
927 BUG_ON(vuart_bus_priv.use_count > 2);
928
929 if (vuart_bus_priv.use_count != 1) {
930 return 0;
931 }
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
965fail_request_irq:
966 ps3_vuart_irq_destroy(vuart_bus_priv.virq);
967 vuart_bus_priv.virq = NO_IRQ;
968fail_alloc_irq:
969 kfree(vuart_bus_priv.bmp);
970 vuart_bus_priv.bmp = NULL;
971fail_bmp_malloc:
972 vuart_bus_priv.use_count--;
973 pr_debug(" <- %s:%d: failed\n", __func__, __LINE__);
974 return result;
975}
976
977static 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
1000static 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 down(&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 down(&vuart_bus_priv.probe_mutex);
1078 goto fail_probe;
1079 }
1080
1081 up(&vuart_bus_priv.probe_mutex);
1082
1083 return result;
1084
1085fail_probe:
1086 ps3_vuart_set_interrupt_mask(dev, 0);
1087 kfree(dev->driver_priv);
1088 dev->driver_priv = NULL;
1089fail_dev_malloc:
1090 vuart_bus_priv.devices[dev->port_number] = NULL;
1091fail_busy:
1092 ps3_vuart_bus_interrupt_put();
1093fail_setup_interrupt:
1094 up(&vuart_bus_priv.probe_mutex);
1095 dev_dbg(&dev->core, "%s:%d: failed\n", __func__, __LINE__);
1096 return result;
1097}
1098
1099/**
1100 * ps3_vuart_cleanup - common cleanup helper.
1101 * @dev: The struct ps3_system_bus_device instance.
1102 *
1103 * Cleans interrupts and HV resources. Must be called with
1104 * vuart_bus_priv.probe_mutex held. Used by ps3_vuart_remove and
1105 * ps3_vuart_shutdown. After this call, polled reading will still work.
1106 */
1107
1108static int ps3_vuart_cleanup(struct ps3_system_bus_device *dev)
1109{
1110 dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
1111
1112 ps3_vuart_cancel_async(dev);
1113 ps3_vuart_set_interrupt_mask(dev, 0);
1114 ps3_vuart_bus_interrupt_put();
1115 return 0;
1116}
1117
1118/**
1119 * ps3_vuart_remove - Completely clean the device instance.
1120 * @dev: The struct ps3_system_bus_device instance.
1121 *
1122 * Cleans all memory, interrupts and HV resources. After this call the
1123 * device can no longer be used.
1124 */
1125
1126static int ps3_vuart_remove(struct ps3_system_bus_device *dev)
1127{
1128 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
1129 struct ps3_vuart_port_driver *drv;
1130
1131 BUG_ON(!dev);
1132
1133 down(&vuart_bus_priv.probe_mutex);
1134
1135 dev_dbg(&dev->core, " -> %s:%d: match_id %d\n", __func__, __LINE__,
1136 dev->match_id);
1137
1138 if (!dev->core.driver) {
1139 dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__,
1140 __LINE__);
1141 up(&vuart_bus_priv.probe_mutex);
1142 return 0;
1143 }
1144
1145 drv = ps3_system_bus_dev_to_vuart_drv(dev);
1146
1147 BUG_ON(!drv);
1148
1149 if (drv->remove) {
1150 drv->remove(dev);
1151 } else {
1152 dev_dbg(&dev->core, "%s:%d: no remove method\n", __func__,
1153 __LINE__);
1154 BUG();
1155 }
1156
1157 ps3_vuart_cleanup(dev);
1158
1159 vuart_bus_priv.devices[dev->port_number] = NULL;
1160 kfree(priv);
1161 priv = NULL;
1162
1163 dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
1164 up(&vuart_bus_priv.probe_mutex);
1165 return 0;
1166}
1167
1168/**
1169 * ps3_vuart_shutdown - Cleans interrupts and HV resources.
1170 * @dev: The struct ps3_system_bus_device instance.
1171 *
1172 * Cleans interrupts and HV resources. After this call the
1173 * device can still be used in polling mode. This behavior required
1174 * by sys-manager to be able to complete the device power operation
1175 * sequence.
1176 */
1177
1178static int ps3_vuart_shutdown(struct ps3_system_bus_device *dev)
1179{
1180 struct ps3_vuart_port_driver *drv;
1181
1182 BUG_ON(!dev);
1183
1184 down(&vuart_bus_priv.probe_mutex);
1185
1186 dev_dbg(&dev->core, " -> %s:%d: match_id %d\n", __func__, __LINE__,
1187 dev->match_id);
1188
1189 if (!dev->core.driver) {
1190 dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__,
1191 __LINE__);
1192 up(&vuart_bus_priv.probe_mutex);
1193 return 0;
1194 }
1195
1196 drv = ps3_system_bus_dev_to_vuart_drv(dev);
1197
1198 BUG_ON(!drv);
1199
1200 if (drv->shutdown)
1201 drv->shutdown(dev);
1202 else if (drv->remove) {
1203 dev_dbg(&dev->core, "%s:%d: no shutdown, calling remove\n",
1204 __func__, __LINE__);
1205 drv->remove(dev);
1206 } else {
1207 dev_dbg(&dev->core, "%s:%d: no shutdown method\n", __func__,
1208 __LINE__);
1209 BUG();
1210 }
1211
1212 ps3_vuart_cleanup(dev);
1213
1214 dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
1215
1216 up(&vuart_bus_priv.probe_mutex);
1217 return 0;
1218}
1219
1220static int __init ps3_vuart_bus_init(void)
1221{
1222 pr_debug("%s:%d:\n", __func__, __LINE__);
1223
1224 if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
1225 return -ENODEV;
1226
1227 init_MUTEX(&vuart_bus_priv.probe_mutex);
1228
1229 return 0;
1230}
1231
1232static void __exit ps3_vuart_bus_exit(void)
1233{
1234 pr_debug("%s:%d:\n", __func__, __LINE__);
1235}
1236
1237core_initcall(ps3_vuart_bus_init);
1238module_exit(ps3_vuart_bus_exit);
1239
1240/**
1241 * ps3_vuart_port_driver_register - Add a vuart port device driver.
1242 */
1243
1244int ps3_vuart_port_driver_register(struct ps3_vuart_port_driver *drv)
1245{
1246 int result;
1247
1248 pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.core.name);
1249
1250 BUG_ON(!drv->core.match_id);
1251 BUG_ON(!drv->core.core.name);
1252
1253 drv->core.probe = ps3_vuart_probe;
1254 drv->core.remove = ps3_vuart_remove;
1255 drv->core.shutdown = ps3_vuart_shutdown;
1256
1257 result = ps3_system_bus_driver_register(&drv->core);
1258 return result;
1259}
1260EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_register);
1261
1262/**
1263 * ps3_vuart_port_driver_unregister - Remove a vuart port device driver.
1264 */
1265
1266void ps3_vuart_port_driver_unregister(struct ps3_vuart_port_driver *drv)
1267{
1268 pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.core.name);
1269 ps3_system_bus_driver_unregister(&drv->core);
1270}
1271EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_unregister);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-29 12:28:09 -0500