Commit | Line | Data |
---|---|---|
74e95d5d GL |
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> | |
ea1547d3 | 24 | #include <linux/workqueue.h> |
1977f032 | 25 | #include <linux/bitops.h> |
74e95d5d GL |
26 | #include <asm/ps3.h> |
27 | ||
75c86e74 | 28 | #include <asm/firmware.h> |
74e95d5d | 29 | #include <asm/lv1call.h> |
74e95d5d GL |
30 | |
31 | #include "vuart.h" | |
32 | ||
33 | MODULE_AUTHOR("Sony Corporation"); | |
34 | MODULE_LICENSE("GPL v2"); | |
75c86e74 | 35 | MODULE_DESCRIPTION("PS3 vuart"); |
74e95d5d GL |
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 | ||
7626e78d GL |
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 | ||
74e95d5d GL |
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 | ||
74e95d5d | 113 | #define dump_ports_bmp(_b) _dump_ports_bmp(_b, __func__, __LINE__) |
848cfdc5 | 114 | static void __maybe_unused _dump_ports_bmp( |
74e95d5d GL |
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 | ||
74e95d5d | 120 | #define dump_port_params(_b) _dump_port_params(_b, __func__, __LINE__) |
848cfdc5 | 121 | static void __maybe_unused _dump_port_params(unsigned int port_number, |
74e95d5d GL |
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 | ||
7626e78d | 158 | int ps3_vuart_get_triggers(struct ps3_system_bus_device *dev, |
74e95d5d GL |
159 | struct vuart_triggers *trig) |
160 | { | |
161 | int result; | |
162 | unsigned long size; | |
163 | unsigned long val; | |
164 | ||
7626e78d | 165 | result = lv1_get_virtual_uart_param(dev->port_number, |
74e95d5d GL |
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 | ||
7626e78d | 174 | result = lv1_get_virtual_uart_param(dev->port_number, |
74e95d5d GL |
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 | ||
7626e78d | 183 | result = lv1_get_virtual_uart_param(dev->port_number, |
74e95d5d GL |
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 | ||
7626e78d | 200 | int ps3_vuart_set_triggers(struct ps3_system_bus_device *dev, unsigned int tx, |
74e95d5d GL |
201 | unsigned int rx) |
202 | { | |
203 | int result; | |
204 | unsigned long size; | |
205 | ||
7626e78d | 206 | result = lv1_set_virtual_uart_param(dev->port_number, |
74e95d5d GL |
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 | ||
7626e78d | 215 | result = lv1_get_virtual_uart_param(dev->port_number, |
74e95d5d GL |
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 | ||
7626e78d | 224 | result = lv1_set_virtual_uart_param(dev->port_number, |
74e95d5d GL |
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 | ||
7626e78d | 239 | static int ps3_vuart_get_rx_bytes_waiting(struct ps3_system_bus_device *dev, |
75c86e74 | 240 | u64 *bytes_waiting) |
74e95d5d | 241 | { |
7626e78d GL |
242 | int result; |
243 | ||
244 | result = lv1_get_virtual_uart_param(dev->port_number, | |
74e95d5d GL |
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 | ||
7626e78d GL |
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 | ||
262 | static int ps3_vuart_set_interrupt_mask(struct ps3_system_bus_device *dev, | |
74e95d5d GL |
263 | unsigned long mask) |
264 | { | |
265 | int result; | |
7626e78d | 266 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
74e95d5d GL |
267 | |
268 | dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__, mask); | |
269 | ||
7626e78d | 270 | priv->interrupt_mask = mask; |
74e95d5d | 271 | |
7626e78d GL |
272 | result = lv1_set_virtual_uart_param(dev->port_number, |
273 | PARAM_INTERRUPT_MASK, priv->interrupt_mask); | |
74e95d5d GL |
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 | ||
7626e78d | 282 | static int ps3_vuart_get_interrupt_status(struct ps3_system_bus_device *dev, |
74e95d5d GL |
283 | unsigned long *status) |
284 | { | |
7626e78d GL |
285 | int result; |
286 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); | |
75c86e74 | 287 | u64 tmp; |
7626e78d GL |
288 | |
289 | result = lv1_get_virtual_uart_param(dev->port_number, | |
75c86e74 | 290 | PARAM_INTERRUPT_STATUS, &tmp); |
74e95d5d GL |
291 | |
292 | if (result) | |
293 | dev_dbg(&dev->core, "%s:%d: interrupt_status failed: %s\n", | |
294 | __func__, __LINE__, ps3_result(result)); | |
295 | ||
7626e78d | 296 | *status = tmp & priv->interrupt_mask; |
75c86e74 | 297 | |
74e95d5d | 298 | dev_dbg(&dev->core, "%s:%d: m %lxh, s %lxh, m&s %lxh\n", |
7626e78d | 299 | __func__, __LINE__, priv->interrupt_mask, tmp, *status); |
74e95d5d GL |
300 | |
301 | return result; | |
302 | } | |
303 | ||
7626e78d | 304 | int ps3_vuart_enable_interrupt_tx(struct ps3_system_bus_device *dev) |
74e95d5d | 305 | { |
7626e78d GL |
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 | |
74e95d5d GL |
310 | | INTERRUPT_MASK_TX); |
311 | } | |
312 | ||
7626e78d | 313 | int ps3_vuart_enable_interrupt_rx(struct ps3_system_bus_device *dev) |
74e95d5d | 314 | { |
7626e78d GL |
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 | |
74e95d5d GL |
319 | | INTERRUPT_MASK_RX); |
320 | } | |
321 | ||
7626e78d | 322 | int ps3_vuart_enable_interrupt_disconnect(struct ps3_system_bus_device *dev) |
74e95d5d | 323 | { |
7626e78d GL |
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 | |
74e95d5d GL |
328 | | INTERRUPT_MASK_DISCONNECT); |
329 | } | |
330 | ||
7626e78d | 331 | int ps3_vuart_disable_interrupt_tx(struct ps3_system_bus_device *dev) |
74e95d5d | 332 | { |
7626e78d GL |
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 | |
74e95d5d GL |
337 | & ~INTERRUPT_MASK_TX) : 0; |
338 | } | |
339 | ||
7626e78d | 340 | int ps3_vuart_disable_interrupt_rx(struct ps3_system_bus_device *dev) |
74e95d5d | 341 | { |
7626e78d GL |
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 | |
74e95d5d GL |
346 | & ~INTERRUPT_MASK_RX) : 0; |
347 | } | |
348 | ||
7626e78d | 349 | int ps3_vuart_disable_interrupt_disconnect(struct ps3_system_bus_device *dev) |
74e95d5d | 350 | { |
7626e78d GL |
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 | |
74e95d5d GL |
355 | & ~INTERRUPT_MASK_DISCONNECT) : 0; |
356 | } | |
357 | ||
358 | /** | |
359 | * ps3_vuart_raw_write - Low level write helper. | |
7626e78d | 360 | * @dev: The struct ps3_system_bus_device instance. |
74e95d5d GL |
361 | * |
362 | * Do not call ps3_vuart_raw_write directly, use ps3_vuart_write. | |
363 | */ | |
364 | ||
7626e78d | 365 | static int ps3_vuart_raw_write(struct ps3_system_bus_device *dev, |
74e95d5d GL |
366 | const void* buf, unsigned int bytes, unsigned long *bytes_written) |
367 | { | |
368 | int result; | |
7626e78d | 369 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
74e95d5d | 370 | |
7626e78d | 371 | result = lv1_write_virtual_uart(dev->port_number, |
74e95d5d GL |
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 | ||
7626e78d | 380 | priv->stats.bytes_written += *bytes_written; |
74e95d5d | 381 | |
75c86e74 | 382 | dev_dbg(&dev->core, "%s:%d: wrote %lxh/%xh=>%lxh\n", __func__, __LINE__, |
7626e78d | 383 | *bytes_written, bytes, priv->stats.bytes_written); |
74e95d5d GL |
384 | |
385 | return result; | |
386 | } | |
387 | ||
388 | /** | |
389 | * ps3_vuart_raw_read - Low level read helper. | |
7626e78d | 390 | * @dev: The struct ps3_system_bus_device instance. |
74e95d5d GL |
391 | * |
392 | * Do not call ps3_vuart_raw_read directly, use ps3_vuart_read. | |
393 | */ | |
394 | ||
7626e78d | 395 | static int ps3_vuart_raw_read(struct ps3_system_bus_device *dev, void *buf, |
74e95d5d GL |
396 | unsigned int bytes, unsigned long *bytes_read) |
397 | { | |
398 | int result; | |
7626e78d | 399 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
74e95d5d GL |
400 | |
401 | dev_dbg(&dev->core, "%s:%d: %xh\n", __func__, __LINE__, bytes); | |
402 | ||
7626e78d | 403 | result = lv1_read_virtual_uart(dev->port_number, |
74e95d5d GL |
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 | ||
7626e78d | 412 | priv->stats.bytes_read += *bytes_read; |
74e95d5d GL |
413 | |
414 | dev_dbg(&dev->core, "%s:%d: read %lxh/%xh=>%lxh\n", __func__, __LINE__, | |
7626e78d | 415 | *bytes_read, bytes, priv->stats.bytes_read); |
74e95d5d GL |
416 | |
417 | return result; | |
418 | } | |
419 | ||
75c86e74 GL |
420 | /** |
421 | * ps3_vuart_clear_rx_bytes - Discard bytes received. | |
7626e78d | 422 | * @dev: The struct ps3_system_bus_device instance. |
75c86e74 GL |
423 | * @bytes: Max byte count to discard, zero = all pending. |
424 | * | |
425 | * Used to clear pending rx interrupt source. Will not block. | |
426 | */ | |
427 | ||
7626e78d | 428 | void ps3_vuart_clear_rx_bytes(struct ps3_system_bus_device *dev, |
75c86e74 GL |
429 | unsigned int bytes) |
430 | { | |
431 | int result; | |
7626e78d | 432 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
75c86e74 GL |
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 | ||
7626e78d | 462 | priv->stats.bytes_read -= bytes_waiting; |
75c86e74 | 463 | } |
7626e78d | 464 | EXPORT_SYMBOL_GPL(ps3_vuart_clear_rx_bytes); |
75c86e74 | 465 | |
74e95d5d GL |
466 | /** |
467 | * struct list_buffer - An element for a port device fifo buffer list. | |
468 | */ | |
469 | ||
470 | struct 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 | |
7626e78d | 480 | * @dev: The struct ps3_system_bus_device instance. |
74e95d5d GL |
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 | ||
7626e78d | 488 | int ps3_vuart_write(struct ps3_system_bus_device *dev, const void *buf, |
74e95d5d GL |
489 | unsigned int bytes) |
490 | { | |
491 | static unsigned long dbg_number; | |
492 | int result; | |
7626e78d | 493 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
74e95d5d GL |
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 | ||
7626e78d | 500 | spin_lock_irqsave(&priv->tx_list.lock, flags); |
74e95d5d | 501 | |
7626e78d | 502 | if (list_empty(&priv->tx_list.head)) { |
74e95d5d GL |
503 | unsigned long bytes_written; |
504 | ||
505 | result = ps3_vuart_raw_write(dev, buf, bytes, &bytes_written); | |
506 | ||
7626e78d | 507 | spin_unlock_irqrestore(&priv->tx_list.lock, flags); |
74e95d5d GL |
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 | |
7626e78d | 525 | spin_unlock_irqrestore(&priv->tx_list.lock, flags); |
74e95d5d GL |
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 | ||
7626e78d GL |
538 | spin_lock_irqsave(&priv->tx_list.lock, flags); |
539 | list_add_tail(&lb->link, &priv->tx_list.head); | |
74e95d5d | 540 | ps3_vuart_enable_interrupt_tx(dev); |
7626e78d | 541 | spin_unlock_irqrestore(&priv->tx_list.lock, flags); |
74e95d5d GL |
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 | } | |
7626e78d GL |
548 | EXPORT_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 | ||
558 | static 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 | } | |
74e95d5d GL |
603 | |
604 | /** | |
7626e78d | 605 | * ps3_vuart_read - The entry point for reading data from a port. |
74e95d5d | 606 | * |
7626e78d GL |
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. | |
74e95d5d GL |
611 | */ |
612 | ||
7626e78d | 613 | int ps3_vuart_read(struct ps3_system_bus_device *dev, void *buf, |
74e95d5d GL |
614 | unsigned int bytes) |
615 | { | |
7626e78d GL |
616 | int result; |
617 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); | |
74e95d5d GL |
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 | ||
7626e78d | 625 | spin_lock_irqsave(&priv->rx_list.lock, flags); |
74e95d5d | 626 | |
7626e78d GL |
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 | } | |
74e95d5d GL |
640 | } |
641 | ||
7626e78d | 642 | list_for_each_entry_safe(lb, n, &priv->rx_list.head, link) { |
74e95d5d GL |
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; | |
7626e78d | 648 | priv->rx_list.bytes_held -= bytes_read; |
74e95d5d GL |
649 | |
650 | if (bytes_read < lb->tail - lb->head) { | |
651 | lb->head += bytes_read; | |
75c86e74 GL |
652 | dev_dbg(&dev->core, "%s:%d: buf_%lu: dequeued %lxh " |
653 | "bytes\n", __func__, __LINE__, lb->dbg_number, | |
654 | bytes_read); | |
7626e78d | 655 | spin_unlock_irqrestore(&priv->rx_list.lock, flags); |
74e95d5d GL |
656 | return 0; |
657 | } | |
658 | ||
75c86e74 GL |
659 | dev_dbg(&dev->core, "%s:%d: buf_%lu: free, dequeued %lxh " |
660 | "bytes\n", __func__, __LINE__, lb->dbg_number, | |
661 | bytes_read); | |
74e95d5d GL |
662 | |
663 | list_del(&lb->link); | |
664 | kfree(lb); | |
665 | } | |
74e95d5d | 666 | |
7626e78d | 667 | spin_unlock_irqrestore(&priv->rx_list.lock, flags); |
74e95d5d GL |
668 | return 0; |
669 | } | |
7626e78d | 670 | EXPORT_SYMBOL_GPL(ps3_vuart_read); |
74e95d5d | 671 | |
7626e78d GL |
672 | /** |
673 | * ps3_vuart_work - Asynchronous read handler. | |
674 | */ | |
675 | ||
676 | static 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 | ||
687 | int ps3_vuart_read_async(struct ps3_system_bus_device *dev, unsigned int bytes) | |
ea1547d3 | 688 | { |
7626e78d | 689 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
ea1547d3 GL |
690 | unsigned long flags; |
691 | ||
7626e78d | 692 | if (priv->rx_list.work.trigger) { |
ea1547d3 GL |
693 | dev_dbg(&dev->core, "%s:%d: warning, multiple calls\n", |
694 | __func__, __LINE__); | |
695 | return -EAGAIN; | |
696 | } | |
697 | ||
698 | BUG_ON(!bytes); | |
699 | ||
7626e78d | 700 | PREPARE_WORK(&priv->rx_list.work.work, ps3_vuart_work); |
ea1547d3 | 701 | |
7626e78d GL |
702 | spin_lock_irqsave(&priv->rx_list.lock, flags); |
703 | if (priv->rx_list.bytes_held >= bytes) { | |
ea1547d3 GL |
704 | dev_dbg(&dev->core, "%s:%d: schedule_work %xh bytes\n", |
705 | __func__, __LINE__, bytes); | |
7626e78d GL |
706 | schedule_work(&priv->rx_list.work.work); |
707 | spin_unlock_irqrestore(&priv->rx_list.lock, flags); | |
ea1547d3 GL |
708 | return 0; |
709 | } | |
710 | ||
7626e78d GL |
711 | priv->rx_list.work.trigger = bytes; |
712 | spin_unlock_irqrestore(&priv->rx_list.lock, flags); | |
ea1547d3 GL |
713 | |
714 | dev_dbg(&dev->core, "%s:%d: waiting for %u(%xh) bytes\n", __func__, | |
715 | __LINE__, bytes, bytes); | |
716 | ||
717 | return 0; | |
718 | } | |
7626e78d | 719 | EXPORT_SYMBOL_GPL(ps3_vuart_read_async); |
ea1547d3 | 720 | |
7626e78d | 721 | void ps3_vuart_cancel_async(struct ps3_system_bus_device *dev) |
ea1547d3 | 722 | { |
7626e78d | 723 | to_port_priv(dev)->rx_list.work.trigger = 0; |
ea1547d3 | 724 | } |
7626e78d | 725 | EXPORT_SYMBOL_GPL(ps3_vuart_cancel_async); |
ea1547d3 | 726 | |
74e95d5d GL |
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 | ||
7626e78d | 735 | static int ps3_vuart_handle_interrupt_tx(struct ps3_system_bus_device *dev) |
74e95d5d GL |
736 | { |
737 | int result = 0; | |
7626e78d | 738 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
74e95d5d GL |
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 | ||
7626e78d | 745 | spin_lock_irqsave(&priv->tx_list.lock, flags); |
74e95d5d | 746 | |
7626e78d | 747 | list_for_each_entry_safe(lb, n, &priv->tx_list.head, link) { |
74e95d5d GL |
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); | |
780 | port_full: | |
7626e78d | 781 | spin_unlock_irqrestore(&priv->tx_list.lock, flags); |
74e95d5d GL |
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 | ||
7626e78d | 795 | static int ps3_vuart_handle_interrupt_rx(struct ps3_system_bus_device *dev) |
74e95d5d | 796 | { |
7626e78d GL |
797 | int result; |
798 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); | |
74e95d5d | 799 | unsigned long flags; |
7626e78d | 800 | u64 bytes; |
74e95d5d GL |
801 | |
802 | dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__); | |
803 | ||
7626e78d GL |
804 | spin_lock_irqsave(&priv->rx_list.lock, flags); |
805 | result = ps3_vuart_queue_rx_bytes(dev, &bytes); | |
74e95d5d | 806 | |
7626e78d GL |
807 | if (result) { |
808 | spin_unlock_irqrestore(&priv->rx_list.lock, flags); | |
809 | return result; | |
810 | } | |
74e95d5d | 811 | |
7626e78d GL |
812 | if (priv->rx_list.work.trigger && priv->rx_list.bytes_held |
813 | >= priv->rx_list.work.trigger) { | |
ea1547d3 | 814 | dev_dbg(&dev->core, "%s:%d: schedule_work %lxh bytes\n", |
7626e78d GL |
815 | __func__, __LINE__, priv->rx_list.work.trigger); |
816 | priv->rx_list.work.trigger = 0; | |
817 | schedule_work(&priv->rx_list.work.work); | |
ea1547d3 | 818 | } |
7626e78d GL |
819 | |
820 | spin_unlock_irqrestore(&priv->rx_list.lock, flags); | |
821 | return result; | |
74e95d5d GL |
822 | } |
823 | ||
824 | static int ps3_vuart_handle_interrupt_disconnect( | |
7626e78d | 825 | struct ps3_system_bus_device *dev) |
74e95d5d GL |
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 | ||
7626e78d | 840 | static int ps3_vuart_handle_port_interrupt(struct ps3_system_bus_device *dev) |
74e95d5d GL |
841 | { |
842 | int result; | |
7626e78d | 843 | struct ps3_vuart_port_priv *priv = to_port_priv(dev); |
74e95d5d GL |
844 | unsigned long status; |
845 | ||
75c86e74 | 846 | result = ps3_vuart_get_interrupt_status(dev, &status); |
74e95d5d GL |
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) { | |
7626e78d | 855 | priv->stats.disconnect_interrupts++; |
74e95d5d GL |
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) { | |
7626e78d | 862 | priv->stats.tx_interrupts++; |
74e95d5d GL |
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) { | |
7626e78d | 869 | priv->stats.rx_interrupts++; |
74e95d5d GL |
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 | ||
75c86e74 | 878 | struct vuart_bus_priv { |
7626e78d | 879 | struct ports_bmp *bmp; |
74e95d5d | 880 | unsigned int virq; |
75c86e74 GL |
881 | struct semaphore probe_mutex; |
882 | int use_count; | |
7626e78d | 883 | struct ps3_system_bus_device *devices[PORT_COUNT]; |
75c86e74 | 884 | } static vuart_bus_priv; |
74e95d5d GL |
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 | ||
894 | static irqreturn_t ps3_vuart_irq_handler(int irq, void *_private) | |
895 | { | |
7626e78d | 896 | struct vuart_bus_priv *bus_priv = _private; |
74e95d5d | 897 | |
7626e78d | 898 | BUG_ON(!bus_priv); |
74e95d5d GL |
899 | |
900 | while (1) { | |
901 | unsigned int port; | |
902 | ||
7626e78d | 903 | dump_ports_bmp(bus_priv->bmp); |
74e95d5d | 904 | |
7626e78d | 905 | port = (BITS_PER_LONG - 1) - __ilog2(bus_priv->bmp->status); |
74e95d5d GL |
906 | |
907 | if (port == BITS_PER_LONG) | |
908 | break; | |
909 | ||
910 | BUG_ON(port >= PORT_COUNT); | |
75c86e74 | 911 | BUG_ON(!bus_priv->devices[port]); |
74e95d5d | 912 | |
75c86e74 | 913 | ps3_vuart_handle_port_interrupt(bus_priv->devices[port]); |
74e95d5d GL |
914 | } |
915 | ||
916 | return IRQ_HANDLED; | |
917 | } | |
918 | ||
7626e78d | 919 | static int ps3_vuart_bus_interrupt_get(void) |
74e95d5d GL |
920 | { |
921 | int result; | |
74e95d5d | 922 | |
7626e78d GL |
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); | |
74e95d5d | 955 | |
7626e78d GL |
956 | if (result) { |
957 | pr_debug("%s:%d: request_irq failed (%d)\n", | |
958 | __func__, __LINE__, result); | |
959 | goto fail_request_irq; | |
960 | } | |
74e95d5d | 961 | |
7626e78d | 962 | pr_debug(" <- %s:%d: ok\n", __func__, __LINE__); |
74e95d5d | 963 | return result; |
7626e78d GL |
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; | |
74e95d5d GL |
998 | } |
999 | ||
7626e78d | 1000 | static int ps3_vuart_probe(struct ps3_system_bus_device *dev) |
74e95d5d GL |
1001 | { |
1002 | int result; | |
7626e78d GL |
1003 | struct ps3_vuart_port_driver *drv; |
1004 | struct ps3_vuart_port_priv *priv = NULL; | |
74e95d5d GL |
1005 | |
1006 | dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__); | |
1007 | ||
7626e78d GL |
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 | ||
74e95d5d GL |
1013 | BUG_ON(!drv); |
1014 | ||
7626e78d GL |
1015 | if (dev->port_number >= PORT_COUNT) { |
1016 | BUG(); | |
1017 | return -EINVAL; | |
1018 | } | |
75c86e74 | 1019 | |
7626e78d | 1020 | down(&vuart_bus_priv.probe_mutex); |
75c86e74 | 1021 | |
7626e78d | 1022 | result = ps3_vuart_bus_interrupt_get(); |
74e95d5d | 1023 | |
7626e78d GL |
1024 | if (result) |
1025 | goto fail_setup_interrupt; | |
74e95d5d | 1026 | |
7626e78d | 1027 | if (vuart_bus_priv.devices[dev->port_number]) { |
74e95d5d | 1028 | dev_dbg(&dev->core, "%s:%d: port busy (%d)\n", __func__, |
7626e78d | 1029 | __LINE__, dev->port_number); |
74e95d5d | 1030 | result = -EBUSY; |
7626e78d | 1031 | goto fail_busy; |
74e95d5d GL |
1032 | } |
1033 | ||
7626e78d | 1034 | vuart_bus_priv.devices[dev->port_number] = dev; |
75c86e74 | 1035 | |
7626e78d | 1036 | /* Setup dev->driver_priv. */ |
75c86e74 | 1037 | |
7626e78d GL |
1038 | dev->driver_priv = kzalloc(sizeof(struct ps3_vuart_port_priv), |
1039 | GFP_KERNEL); | |
75c86e74 | 1040 | |
7626e78d | 1041 | if (!dev->driver_priv) { |
75c86e74 | 1042 | result = -ENOMEM; |
7626e78d | 1043 | goto fail_dev_malloc; |
75c86e74 GL |
1044 | } |
1045 | ||
7626e78d | 1046 | priv = to_port_priv(dev); |
75c86e74 | 1047 | |
7626e78d GL |
1048 | INIT_LIST_HEAD(&priv->tx_list.head); |
1049 | spin_lock_init(&priv->tx_list.lock); | |
75c86e74 | 1050 | |
7626e78d GL |
1051 | INIT_LIST_HEAD(&priv->rx_list.head); |
1052 | spin_lock_init(&priv->rx_list.lock); | |
ea1547d3 | 1053 | |
7626e78d GL |
1054 | INIT_WORK(&priv->rx_list.work.work, NULL); |
1055 | priv->rx_list.work.trigger = 0; | |
1056 | priv->rx_list.work.dev = dev; | |
74e95d5d | 1057 | |
74e95d5d | 1058 | /* clear stale pending interrupts */ |
75c86e74 GL |
1059 | |
1060 | ps3_vuart_clear_rx_bytes(dev, 0); | |
1061 | ||
1062 | ps3_vuart_set_interrupt_mask(dev, INTERRUPT_MASK_RX); | |
74e95d5d GL |
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 | ||
75c86e74 GL |
1080 | up(&vuart_bus_priv.probe_mutex); |
1081 | ||
74e95d5d GL |
1082 | return result; |
1083 | ||
1084 | fail_probe: | |
75c86e74 | 1085 | ps3_vuart_set_interrupt_mask(dev, 0); |
7626e78d GL |
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: | |
75c86e74 | 1093 | up(&vuart_bus_priv.probe_mutex); |
7626e78d | 1094 | dev_dbg(&dev->core, "%s:%d: failed\n", __func__, __LINE__); |
74e95d5d GL |
1095 | return result; |
1096 | } | |
1097 | ||
7626e78d GL |
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) | |
74e95d5d | 1108 | { |
7626e78d GL |
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); | |
74e95d5d | 1131 | |
75c86e74 GL |
1132 | down(&vuart_bus_priv.probe_mutex); |
1133 | ||
7626e78d GL |
1134 | dev_dbg(&dev->core, " -> %s:%d: match_id %d\n", __func__, __LINE__, |
1135 | dev->match_id); | |
74e95d5d | 1136 | |
7626e78d GL |
1137 | if (!dev->core.driver) { |
1138 | dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__, | |
1139 | __LINE__); | |
1140 | up(&vuart_bus_priv.probe_mutex); | |
1141 | return 0; | |
1142 | } | |
74e95d5d | 1143 | |
7626e78d | 1144 | drv = ps3_system_bus_dev_to_vuart_drv(dev); |
74e95d5d | 1145 | |
7626e78d | 1146 | BUG_ON(!drv); |
74e95d5d | 1147 | |
7626e78d GL |
1148 | if (drv->remove) { |
1149 | drv->remove(dev); | |
1150 | } else { | |
1151 | dev_dbg(&dev->core, "%s:%d: no remove method\n", __func__, | |
1152 | __LINE__); | |
75c86e74 | 1153 | BUG(); |
74e95d5d | 1154 | } |
75c86e74 | 1155 | |
7626e78d GL |
1156 | ps3_vuart_cleanup(dev); |
1157 | ||
1158 | vuart_bus_priv.devices[dev->port_number] = NULL; | |
1159 | kfree(priv); | |
1160 | priv = NULL; | |
75c86e74 | 1161 | |
7626e78d | 1162 | dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__); |
75c86e74 | 1163 | up(&vuart_bus_priv.probe_mutex); |
74e95d5d GL |
1164 | return 0; |
1165 | } | |
1166 | ||
1167 | /** | |
7626e78d GL |
1168 | * ps3_vuart_shutdown - Cleans interrupts and HV resources. |
1169 | * @dev: The struct ps3_system_bus_device instance. | |
74e95d5d | 1170 | * |
7626e78d GL |
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. | |
74e95d5d GL |
1175 | */ |
1176 | ||
7626e78d | 1177 | static int ps3_vuart_shutdown(struct ps3_system_bus_device *dev) |
74e95d5d | 1178 | { |
7626e78d | 1179 | struct ps3_vuart_port_driver *drv; |
74e95d5d | 1180 | |
7626e78d | 1181 | BUG_ON(!dev); |
75c86e74 | 1182 | |
7626e78d | 1183 | down(&vuart_bus_priv.probe_mutex); |
75c86e74 | 1184 | |
7626e78d GL |
1185 | dev_dbg(&dev->core, " -> %s:%d: match_id %d\n", __func__, __LINE__, |
1186 | dev->match_id); | |
75c86e74 | 1187 | |
7626e78d GL |
1188 | if (!dev->core.driver) { |
1189 | dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__, | |
1190 | __LINE__); | |
1191 | up(&vuart_bus_priv.probe_mutex); | |
1192 | return 0; | |
1193 | } | |
74e95d5d | 1194 | |
7626e78d | 1195 | drv = ps3_system_bus_dev_to_vuart_drv(dev); |
74e95d5d | 1196 | |
7626e78d | 1197 | BUG_ON(!drv); |
74e95d5d | 1198 | |
7626e78d GL |
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 | } | |
74e95d5d | 1210 | |
7626e78d | 1211 | ps3_vuart_cleanup(dev); |
75c86e74 | 1212 | |
7626e78d | 1213 | dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__); |
75c86e74 | 1214 | |
7626e78d GL |
1215 | up(&vuart_bus_priv.probe_mutex); |
1216 | return 0; | |
74e95d5d GL |
1217 | } |
1218 | ||
7626e78d | 1219 | static int __init ps3_vuart_bus_init(void) |
74e95d5d | 1220 | { |
7626e78d | 1221 | pr_debug("%s:%d:\n", __func__, __LINE__); |
75c86e74 | 1222 | |
7626e78d GL |
1223 | if (!firmware_has_feature(FW_FEATURE_PS3_LV1)) |
1224 | return -ENODEV; | |
74e95d5d | 1225 | |
7626e78d | 1226 | init_MUTEX(&vuart_bus_priv.probe_mutex); |
74e95d5d | 1227 | |
7626e78d GL |
1228 | return 0; |
1229 | } | |
74e95d5d | 1230 | |
7626e78d GL |
1231 | static void __exit ps3_vuart_bus_exit(void) |
1232 | { | |
1233 | pr_debug("%s:%d:\n", __func__, __LINE__); | |
74e95d5d GL |
1234 | } |
1235 | ||
7626e78d GL |
1236 | core_initcall(ps3_vuart_bus_init); |
1237 | module_exit(ps3_vuart_bus_exit); | |
74e95d5d GL |
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 | ||
7626e78d GL |
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); | |
74e95d5d GL |
1257 | return result; |
1258 | } | |
74e95d5d GL |
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 | { | |
7626e78d GL |
1267 | pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.core.name); |
1268 | ps3_system_bus_driver_unregister(&drv->core); | |
74e95d5d | 1269 | } |
74e95d5d | 1270 | EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_unregister); |