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/slab.h>
23 #include <linux/module.h>
24 #include <linux/interrupt.h>
25 #include <linux/workqueue.h>
26 #include <linux/bitops.h>
27 #include <asm/ps3.h>
28 
29 #include <asm/firmware.h>
30 #include <asm/lv1call.h>
31 
32 #include "vuart.h"
33 
34 MODULE_AUTHOR("Sony Corporation");
35 MODULE_LICENSE("GPL v2");
36 MODULE_DESCRIPTION("PS3 vuart");
37 
38 /**
39  * vuart - An inter-partition data link service.
40  *  port 0: PS3 AV Settings.
41  *  port 2: PS3 System Manager.
42  *
43  * The vuart provides a bi-directional byte stream data link between logical
44  * partitions.  Its primary role is as a communications link between the guest
45  * OS and the system policy module.  The current HV does not support any
46  * connections other than those listed.
47  */
48 
49 enum {PORT_COUNT = 3,};
50 
51 enum vuart_param {
52 	PARAM_TX_TRIGGER = 0,
53 	PARAM_RX_TRIGGER = 1,
54 	PARAM_INTERRUPT_MASK = 2,
55 	PARAM_RX_BUF_SIZE = 3, /* read only */
56 	PARAM_RX_BYTES = 4, /* read only */
57 	PARAM_TX_BUF_SIZE = 5, /* read only */
58 	PARAM_TX_BYTES = 6, /* read only */
59 	PARAM_INTERRUPT_STATUS = 7, /* read only */
60 };
61 
62 enum vuart_interrupt_bit {
63 	INTERRUPT_BIT_TX = 0,
64 	INTERRUPT_BIT_RX = 1,
65 	INTERRUPT_BIT_DISCONNECT = 2,
66 };
67 
68 enum vuart_interrupt_mask {
69 	INTERRUPT_MASK_TX = 1,
70 	INTERRUPT_MASK_RX = 2,
71 	INTERRUPT_MASK_DISCONNECT = 4,
72 };
73 
74 /**
75  * struct ps3_vuart_port_priv - private vuart device data.
76  */
77 
78 struct ps3_vuart_port_priv {
79 	u64 interrupt_mask;
80 
81 	struct {
82 		spinlock_t lock;
83 		struct list_head head;
84 	} tx_list;
85 	struct {
86 		struct ps3_vuart_work work;
87 		unsigned long bytes_held;
88 		spinlock_t lock;
89 		struct list_head head;
90 	} rx_list;
91 	struct ps3_vuart_stats stats;
92 };
93 
to_port_priv(struct ps3_system_bus_device * dev)94 static struct ps3_vuart_port_priv *to_port_priv(
95 	struct ps3_system_bus_device *dev)
96 {
97 	BUG_ON(!dev);
98 	BUG_ON(!dev->driver_priv);
99 	return (struct ps3_vuart_port_priv *)dev->driver_priv;
100 }
101 
102 /**
103  * struct ports_bmp - bitmap indicating ports needing service.
104  *
105  * A 256 bit read only bitmap indicating ports needing service.  Do not write
106  * to these bits.  Must not cross a page boundary.
107  */
108 
109 struct ports_bmp {
110 	u64 status;
111 	u64 unused[3];
112 } __attribute__((aligned(32)));
113 
114 #define dump_ports_bmp(_b) _dump_ports_bmp(_b, __func__, __LINE__)
_dump_ports_bmp(const struct ports_bmp * bmp,const char * func,int line)115 static void __maybe_unused _dump_ports_bmp(
116 	const struct ports_bmp *bmp, const char *func, int line)
117 {
118 	pr_debug("%s:%d: ports_bmp: %016llxh\n", func, line, bmp->status);
119 }
120 
121 #define dump_port_params(_b) _dump_port_params(_b, __func__, __LINE__)
_dump_port_params(unsigned int port_number,const char * func,int line)122 static void __maybe_unused _dump_port_params(unsigned int port_number,
123 	const char *func, int line)
124 {
125 #if defined(DEBUG)
126 	static const char *strings[] = {
127 		"tx_trigger      ",
128 		"rx_trigger      ",
129 		"interrupt_mask  ",
130 		"rx_buf_size     ",
131 		"rx_bytes        ",
132 		"tx_buf_size     ",
133 		"tx_bytes        ",
134 		"interrupt_status",
135 	};
136 	int result;
137 	unsigned int i;
138 	u64 value;
139 
140 	for (i = 0; i < ARRAY_SIZE(strings); i++) {
141 		result = lv1_get_virtual_uart_param(port_number, i, &value);
142 
143 		if (result) {
144 			pr_debug("%s:%d: port_%u: %s failed: %s\n", func, line,
145 				port_number, strings[i], ps3_result(result));
146 			continue;
147 		}
148 		pr_debug("%s:%d: port_%u: %s = %lxh\n",
149 			func, line, port_number, strings[i], value);
150 	}
151 #endif
152 }
153 
154 struct vuart_triggers {
155 	unsigned long rx;
156 	unsigned long tx;
157 };
158 
ps3_vuart_get_triggers(struct ps3_system_bus_device * dev,struct vuart_triggers * trig)159 int ps3_vuart_get_triggers(struct ps3_system_bus_device *dev,
160 	struct vuart_triggers *trig)
161 {
162 	int result;
163 	u64 size;
164 	u64 val;
165 	u64 tx;
166 
167 	result = lv1_get_virtual_uart_param(dev->port_number,
168 		PARAM_TX_TRIGGER, &tx);
169 	trig->tx = tx;
170 
171 	if (result) {
172 		dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n",
173 			__func__, __LINE__, ps3_result(result));
174 		return result;
175 	}
176 
177 	result = lv1_get_virtual_uart_param(dev->port_number,
178 		PARAM_RX_BUF_SIZE, &size);
179 
180 	if (result) {
181 		dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n",
182 			__func__, __LINE__, ps3_result(result));
183 		return result;
184 	}
185 
186 	result = lv1_get_virtual_uart_param(dev->port_number,
187 		PARAM_RX_TRIGGER, &val);
188 
189 	if (result) {
190 		dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n",
191 			__func__, __LINE__, ps3_result(result));
192 		return result;
193 	}
194 
195 	trig->rx = size - val;
196 
197 	dev_dbg(&dev->core, "%s:%d: tx %lxh, rx %lxh\n", __func__, __LINE__,
198 		trig->tx, trig->rx);
199 
200 	return result;
201 }
202 
ps3_vuart_set_triggers(struct ps3_system_bus_device * dev,unsigned int tx,unsigned int rx)203 int ps3_vuart_set_triggers(struct ps3_system_bus_device *dev, unsigned int tx,
204 	unsigned int rx)
205 {
206 	int result;
207 	u64 size;
208 
209 	result = lv1_set_virtual_uart_param(dev->port_number,
210 		PARAM_TX_TRIGGER, tx);
211 
212 	if (result) {
213 		dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n",
214 			__func__, __LINE__, ps3_result(result));
215 		return result;
216 	}
217 
218 	result = lv1_get_virtual_uart_param(dev->port_number,
219 		PARAM_RX_BUF_SIZE, &size);
220 
221 	if (result) {
222 		dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n",
223 			__func__, __LINE__, ps3_result(result));
224 		return result;
225 	}
226 
227 	result = lv1_set_virtual_uart_param(dev->port_number,
228 		PARAM_RX_TRIGGER, size - rx);
229 
230 	if (result) {
231 		dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n",
232 			__func__, __LINE__, ps3_result(result));
233 		return result;
234 	}
235 
236 	dev_dbg(&dev->core, "%s:%d: tx %xh, rx %xh\n", __func__, __LINE__,
237 		tx, rx);
238 
239 	return result;
240 }
241 
ps3_vuart_get_rx_bytes_waiting(struct ps3_system_bus_device * dev,u64 * bytes_waiting)242 static int ps3_vuart_get_rx_bytes_waiting(struct ps3_system_bus_device *dev,
243 	u64 *bytes_waiting)
244 {
245 	int result;
246 
247 	result = lv1_get_virtual_uart_param(dev->port_number,
248 		PARAM_RX_BYTES, bytes_waiting);
249 
250 	if (result)
251 		dev_dbg(&dev->core, "%s:%d: rx_bytes failed: %s\n",
252 			__func__, __LINE__, ps3_result(result));
253 
254 	dev_dbg(&dev->core, "%s:%d: %llxh\n", __func__, __LINE__,
255 		*bytes_waiting);
256 	return result;
257 }
258 
259 /**
260  * ps3_vuart_set_interrupt_mask - Enable/disable the port interrupt sources.
261  * @dev: The struct ps3_system_bus_device instance.
262  * @bmp: Logical OR of enum vuart_interrupt_mask values. A zero bit disables.
263  */
264 
ps3_vuart_set_interrupt_mask(struct ps3_system_bus_device * dev,unsigned long mask)265 static int ps3_vuart_set_interrupt_mask(struct ps3_system_bus_device *dev,
266 	unsigned long mask)
267 {
268 	int result;
269 	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
270 
271 	dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__, mask);
272 
273 	priv->interrupt_mask = mask;
274 
275 	result = lv1_set_virtual_uart_param(dev->port_number,
276 		PARAM_INTERRUPT_MASK, priv->interrupt_mask);
277 
278 	if (result)
279 		dev_dbg(&dev->core, "%s:%d: interrupt_mask failed: %s\n",
280 			__func__, __LINE__, ps3_result(result));
281 
282 	return result;
283 }
284 
ps3_vuart_get_interrupt_status(struct ps3_system_bus_device * dev,unsigned long * status)285 static int ps3_vuart_get_interrupt_status(struct ps3_system_bus_device *dev,
286 	unsigned long *status)
287 {
288 	int result;
289 	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
290 	u64 tmp;
291 
292 	result = lv1_get_virtual_uart_param(dev->port_number,
293 		PARAM_INTERRUPT_STATUS, &tmp);
294 
295 	if (result)
296 		dev_dbg(&dev->core, "%s:%d: interrupt_status failed: %s\n",
297 			__func__, __LINE__, ps3_result(result));
298 
299 	*status = tmp & priv->interrupt_mask;
300 
301 	dev_dbg(&dev->core, "%s:%d: m %llxh, s %llxh, m&s %lxh\n",
302 		__func__, __LINE__, priv->interrupt_mask, tmp, *status);
303 
304 	return result;
305 }
306 
ps3_vuart_enable_interrupt_tx(struct ps3_system_bus_device * dev)307 int ps3_vuart_enable_interrupt_tx(struct ps3_system_bus_device *dev)
308 {
309 	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
310 
311 	return (priv->interrupt_mask & INTERRUPT_MASK_TX) ? 0
312 		: ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
313 		| INTERRUPT_MASK_TX);
314 }
315 
ps3_vuart_enable_interrupt_rx(struct ps3_system_bus_device * dev)316 int ps3_vuart_enable_interrupt_rx(struct ps3_system_bus_device *dev)
317 {
318 	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
319 
320 	return (priv->interrupt_mask & INTERRUPT_MASK_RX) ? 0
321 		: ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
322 		| INTERRUPT_MASK_RX);
323 }
324 
ps3_vuart_enable_interrupt_disconnect(struct ps3_system_bus_device * dev)325 int ps3_vuart_enable_interrupt_disconnect(struct ps3_system_bus_device *dev)
326 {
327 	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
328 
329 	return (priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT) ? 0
330 		: ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
331 		| INTERRUPT_MASK_DISCONNECT);
332 }
333 
ps3_vuart_disable_interrupt_tx(struct ps3_system_bus_device * dev)334 int ps3_vuart_disable_interrupt_tx(struct ps3_system_bus_device *dev)
335 {
336 	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
337 
338 	return (priv->interrupt_mask & INTERRUPT_MASK_TX)
339 		? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
340 		& ~INTERRUPT_MASK_TX) : 0;
341 }
342 
ps3_vuart_disable_interrupt_rx(struct ps3_system_bus_device * dev)343 int ps3_vuart_disable_interrupt_rx(struct ps3_system_bus_device *dev)
344 {
345 	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
346 
347 	return (priv->interrupt_mask & INTERRUPT_MASK_RX)
348 		? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
349 		& ~INTERRUPT_MASK_RX) : 0;
350 }
351 
ps3_vuart_disable_interrupt_disconnect(struct ps3_system_bus_device * dev)352 int ps3_vuart_disable_interrupt_disconnect(struct ps3_system_bus_device *dev)
353 {
354 	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
355 
356 	return (priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT)
357 		? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
358 		& ~INTERRUPT_MASK_DISCONNECT) : 0;
359 }
360 
361 /**
362  * ps3_vuart_raw_write - Low level write helper.
363  * @dev: The struct ps3_system_bus_device instance.
364  *
365  * Do not call ps3_vuart_raw_write directly, use ps3_vuart_write.
366  */
367 
ps3_vuart_raw_write(struct ps3_system_bus_device * dev,const void * buf,unsigned int bytes,u64 * bytes_written)368 static int ps3_vuart_raw_write(struct ps3_system_bus_device *dev,
369 	const void *buf, unsigned int bytes, u64 *bytes_written)
370 {
371 	int result;
372 	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
373 
374 	result = lv1_write_virtual_uart(dev->port_number,
375 		ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_written);
376 
377 	if (result) {
378 		dev_dbg(&dev->core, "%s:%d: lv1_write_virtual_uart failed: "
379 			"%s\n", __func__, __LINE__, ps3_result(result));
380 		return result;
381 	}
382 
383 	priv->stats.bytes_written += *bytes_written;
384 
385 	dev_dbg(&dev->core, "%s:%d: wrote %llxh/%xh=>%lxh\n", __func__, __LINE__,
386 		*bytes_written, bytes, priv->stats.bytes_written);
387 
388 	return result;
389 }
390 
391 /**
392  * ps3_vuart_raw_read - Low level read helper.
393  * @dev: The struct ps3_system_bus_device instance.
394  *
395  * Do not call ps3_vuart_raw_read directly, use ps3_vuart_read.
396  */
397 
ps3_vuart_raw_read(struct ps3_system_bus_device * dev,void * buf,unsigned int bytes,u64 * bytes_read)398 static int ps3_vuart_raw_read(struct ps3_system_bus_device *dev, void *buf,
399 	unsigned int bytes, u64 *bytes_read)
400 {
401 	int result;
402 	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
403 
404 	dev_dbg(&dev->core, "%s:%d: %xh\n", __func__, __LINE__, bytes);
405 
406 	result = lv1_read_virtual_uart(dev->port_number,
407 		ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_read);
408 
409 	if (result) {
410 		dev_dbg(&dev->core, "%s:%d: lv1_read_virtual_uart failed: %s\n",
411 			__func__, __LINE__, ps3_result(result));
412 		return result;
413 	}
414 
415 	priv->stats.bytes_read += *bytes_read;
416 
417 	dev_dbg(&dev->core, "%s:%d: read %llxh/%xh=>%lxh\n", __func__, __LINE__,
418 		*bytes_read, bytes, priv->stats.bytes_read);
419 
420 	return result;
421 }
422 
423 /**
424  * ps3_vuart_clear_rx_bytes - Discard bytes received.
425  * @dev: The struct ps3_system_bus_device instance.
426  * @bytes: Max byte count to discard, zero = all pending.
427  *
428  * Used to clear pending rx interrupt source.  Will not block.
429  */
430 
ps3_vuart_clear_rx_bytes(struct ps3_system_bus_device * dev,unsigned int bytes)431 void ps3_vuart_clear_rx_bytes(struct ps3_system_bus_device *dev,
432 	unsigned int bytes)
433 {
434 	int result;
435 	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
436 	u64 bytes_waiting;
437 	void *tmp;
438 
439 	result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes_waiting);
440 
441 	BUG_ON(result);
442 
443 	bytes = bytes ? min(bytes, (unsigned int)bytes_waiting) : bytes_waiting;
444 
445 	dev_dbg(&dev->core, "%s:%d: %u\n", __func__, __LINE__, bytes);
446 
447 	if (!bytes)
448 		return;
449 
450 	/* Add some extra space for recently arrived data. */
451 
452 	bytes += 128;
453 
454 	tmp = kmalloc(bytes, GFP_KERNEL);
455 
456 	if (!tmp)
457 		return;
458 
459 	ps3_vuart_raw_read(dev, tmp, bytes, &bytes_waiting);
460 
461 	kfree(tmp);
462 
463 	/* Don't include these bytes in the stats. */
464 
465 	priv->stats.bytes_read -= bytes_waiting;
466 }
467 EXPORT_SYMBOL_GPL(ps3_vuart_clear_rx_bytes);
468 
469 /**
470  * struct list_buffer - An element for a port device fifo buffer list.
471  */
472 
473 struct list_buffer {
474 	struct list_head link;
475 	const unsigned char *head;
476 	const unsigned char *tail;
477 	unsigned long dbg_number;
478 	unsigned char data[];
479 };
480 
481 /**
482  * ps3_vuart_write - the entry point for writing data to a port
483  * @dev: The struct ps3_system_bus_device instance.
484  *
485  * If the port is idle on entry as much of the incoming data is written to
486  * the port as the port will accept.  Otherwise a list buffer is created
487  * and any remaning incoming data is copied to that buffer.  The buffer is
488  * then enqueued for transmision via the transmit interrupt.
489  */
490 
ps3_vuart_write(struct ps3_system_bus_device * dev,const void * buf,unsigned int bytes)491 int ps3_vuart_write(struct ps3_system_bus_device *dev, const void *buf,
492 	unsigned int bytes)
493 {
494 	static unsigned long dbg_number;
495 	int result;
496 	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
497 	unsigned long flags;
498 	struct list_buffer *lb;
499 
500 	dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
501 		bytes, bytes);
502 
503 	spin_lock_irqsave(&priv->tx_list.lock, flags);
504 
505 	if (list_empty(&priv->tx_list.head)) {
506 		u64 bytes_written;
507 
508 		result = ps3_vuart_raw_write(dev, buf, bytes, &bytes_written);
509 
510 		spin_unlock_irqrestore(&priv->tx_list.lock, flags);
511 
512 		if (result) {
513 			dev_dbg(&dev->core,
514 				"%s:%d: ps3_vuart_raw_write failed\n",
515 				__func__, __LINE__);
516 			return result;
517 		}
518 
519 		if (bytes_written == bytes) {
520 			dev_dbg(&dev->core, "%s:%d: wrote %xh bytes\n",
521 				__func__, __LINE__, bytes);
522 			return 0;
523 		}
524 
525 		bytes -= bytes_written;
526 		buf += bytes_written;
527 	} else
528 		spin_unlock_irqrestore(&priv->tx_list.lock, flags);
529 
530 	lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_KERNEL);
531 
532 	if (!lb)
533 		return -ENOMEM;
534 
535 	memcpy(lb->data, buf, bytes);
536 	lb->head = lb->data;
537 	lb->tail = lb->data + bytes;
538 	lb->dbg_number = ++dbg_number;
539 
540 	spin_lock_irqsave(&priv->tx_list.lock, flags);
541 	list_add_tail(&lb->link, &priv->tx_list.head);
542 	ps3_vuart_enable_interrupt_tx(dev);
543 	spin_unlock_irqrestore(&priv->tx_list.lock, flags);
544 
545 	dev_dbg(&dev->core, "%s:%d: queued buf_%lu, %xh bytes\n",
546 		__func__, __LINE__, lb->dbg_number, bytes);
547 
548 	return 0;
549 }
550 EXPORT_SYMBOL_GPL(ps3_vuart_write);
551 
552 /**
553  * ps3_vuart_queue_rx_bytes - Queue waiting bytes into the buffer list.
554  * @dev: The struct ps3_system_bus_device instance.
555  * @bytes_queued: Number of bytes queued to the buffer list.
556  *
557  * Must be called with priv->rx_list.lock held.
558  */
559 
ps3_vuart_queue_rx_bytes(struct ps3_system_bus_device * dev,u64 * bytes_queued)560 static int ps3_vuart_queue_rx_bytes(struct ps3_system_bus_device *dev,
561 	u64 *bytes_queued)
562 {
563 	static unsigned long dbg_number;
564 	int result;
565 	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
566 	struct list_buffer *lb;
567 	u64 bytes;
568 
569 	*bytes_queued = 0;
570 
571 	result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes);
572 	BUG_ON(result);
573 
574 	if (result)
575 		return -EIO;
576 
577 	if (!bytes)
578 		return 0;
579 
580 	/* Add some extra space for recently arrived data. */
581 
582 	bytes += 128;
583 
584 	lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_ATOMIC);
585 
586 	if (!lb)
587 		return -ENOMEM;
588 
589 	ps3_vuart_raw_read(dev, lb->data, bytes, &bytes);
590 
591 	lb->head = lb->data;
592 	lb->tail = lb->data + bytes;
593 	lb->dbg_number = ++dbg_number;
594 
595 	list_add_tail(&lb->link, &priv->rx_list.head);
596 	priv->rx_list.bytes_held += bytes;
597 
598 	dev_dbg(&dev->core, "%s:%d: buf_%lu: queued %llxh bytes\n",
599 		__func__, __LINE__, lb->dbg_number, bytes);
600 
601 	*bytes_queued = bytes;
602 
603 	return 0;
604 }
605 
606 /**
607  * ps3_vuart_read - The entry point for reading data from a port.
608  *
609  * Queue data waiting at the port, and if enough bytes to satisfy the request
610  * are held in the buffer list those bytes are dequeued and copied to the
611  * caller's buffer.  Emptied list buffers are retiered.  If the request cannot
612  * be statified by bytes held in the list buffers -EAGAIN is returned.
613  */
614 
ps3_vuart_read(struct ps3_system_bus_device * dev,void * buf,unsigned int bytes)615 int ps3_vuart_read(struct ps3_system_bus_device *dev, void *buf,
616 	unsigned int bytes)
617 {
618 	int result;
619 	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
620 	unsigned long flags;
621 	struct list_buffer *lb, *n;
622 	unsigned long bytes_read;
623 
624 	dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
625 		bytes, bytes);
626 
627 	spin_lock_irqsave(&priv->rx_list.lock, flags);
628 
629 	/* Queue rx bytes here for polled reads. */
630 
631 	while (priv->rx_list.bytes_held < bytes) {
632 		u64 tmp;
633 
634 		result = ps3_vuart_queue_rx_bytes(dev, &tmp);
635 		if (result || !tmp) {
636 			dev_dbg(&dev->core, "%s:%d: starved for %lxh bytes\n",
637 				__func__, __LINE__,
638 				bytes - priv->rx_list.bytes_held);
639 			spin_unlock_irqrestore(&priv->rx_list.lock, flags);
640 			return -EAGAIN;
641 		}
642 	}
643 
644 	list_for_each_entry_safe(lb, n, &priv->rx_list.head, link) {
645 		bytes_read = min((unsigned int)(lb->tail - lb->head), bytes);
646 
647 		memcpy(buf, lb->head, bytes_read);
648 		buf += bytes_read;
649 		bytes -= bytes_read;
650 		priv->rx_list.bytes_held -= bytes_read;
651 
652 		if (bytes_read < lb->tail - lb->head) {
653 			lb->head += bytes_read;
654 			dev_dbg(&dev->core, "%s:%d: buf_%lu: dequeued %lxh "
655 				"bytes\n", __func__, __LINE__, lb->dbg_number,
656 				bytes_read);
657 			spin_unlock_irqrestore(&priv->rx_list.lock, flags);
658 			return 0;
659 		}
660 
661 		dev_dbg(&dev->core, "%s:%d: buf_%lu: free, dequeued %lxh "
662 			"bytes\n", __func__, __LINE__, lb->dbg_number,
663 			bytes_read);
664 
665 		list_del(&lb->link);
666 		kfree(lb);
667 	}
668 
669 	spin_unlock_irqrestore(&priv->rx_list.lock, flags);
670 	return 0;
671 }
672 EXPORT_SYMBOL_GPL(ps3_vuart_read);
673 
674 /**
675  * ps3_vuart_work - Asynchronous read handler.
676  */
677 
ps3_vuart_work(struct work_struct * work)678 static void ps3_vuart_work(struct work_struct *work)
679 {
680 	struct ps3_system_bus_device *dev =
681 		ps3_vuart_work_to_system_bus_dev(work);
682 	struct ps3_vuart_port_driver *drv =
683 		ps3_system_bus_dev_to_vuart_drv(dev);
684 
685 	BUG_ON(!drv);
686 	drv->work(dev);
687 }
688 
ps3_vuart_read_async(struct ps3_system_bus_device * dev,unsigned int bytes)689 int ps3_vuart_read_async(struct ps3_system_bus_device *dev, unsigned int bytes)
690 {
691 	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
692 	unsigned long flags;
693 
694 	if (priv->rx_list.work.trigger) {
695 		dev_dbg(&dev->core, "%s:%d: warning, multiple calls\n",
696 			__func__, __LINE__);
697 		return -EAGAIN;
698 	}
699 
700 	BUG_ON(!bytes);
701 
702 	PREPARE_WORK(&priv->rx_list.work.work, ps3_vuart_work);
703 
704 	spin_lock_irqsave(&priv->rx_list.lock, flags);
705 	if (priv->rx_list.bytes_held >= bytes) {
706 		dev_dbg(&dev->core, "%s:%d: schedule_work %xh bytes\n",
707 			__func__, __LINE__, bytes);
708 		schedule_work(&priv->rx_list.work.work);
709 		spin_unlock_irqrestore(&priv->rx_list.lock, flags);
710 		return 0;
711 	}
712 
713 	priv->rx_list.work.trigger = bytes;
714 	spin_unlock_irqrestore(&priv->rx_list.lock, flags);
715 
716 	dev_dbg(&dev->core, "%s:%d: waiting for %u(%xh) bytes\n", __func__,
717 		__LINE__, bytes, bytes);
718 
719 	return 0;
720 }
721 EXPORT_SYMBOL_GPL(ps3_vuart_read_async);
722 
ps3_vuart_cancel_async(struct ps3_system_bus_device * dev)723 void ps3_vuart_cancel_async(struct ps3_system_bus_device *dev)
724 {
725 	to_port_priv(dev)->rx_list.work.trigger = 0;
726 }
727 EXPORT_SYMBOL_GPL(ps3_vuart_cancel_async);
728 
729 /**
730  * ps3_vuart_handle_interrupt_tx - third stage transmit interrupt handler
731  *
732  * Services the transmit interrupt for the port.  Writes as much data from the
733  * buffer list as the port will accept.  Retires any emptied list buffers and
734  * adjusts the final list buffer state for a partial write.
735  */
736 
ps3_vuart_handle_interrupt_tx(struct ps3_system_bus_device * dev)737 static int ps3_vuart_handle_interrupt_tx(struct ps3_system_bus_device *dev)
738 {
739 	int result = 0;
740 	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
741 	unsigned long flags;
742 	struct list_buffer *lb, *n;
743 	unsigned long bytes_total = 0;
744 
745 	dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
746 
747 	spin_lock_irqsave(&priv->tx_list.lock, flags);
748 
749 	list_for_each_entry_safe(lb, n, &priv->tx_list.head, link) {
750 
751 		u64 bytes_written;
752 
753 		result = ps3_vuart_raw_write(dev, lb->head, lb->tail - lb->head,
754 			&bytes_written);
755 
756 		if (result) {
757 			dev_dbg(&dev->core,
758 				"%s:%d: ps3_vuart_raw_write failed\n",
759 				__func__, __LINE__);
760 			break;
761 		}
762 
763 		bytes_total += bytes_written;
764 
765 		if (bytes_written < lb->tail - lb->head) {
766 			lb->head += bytes_written;
767 			dev_dbg(&dev->core,
768 				"%s:%d cleared buf_%lu, %llxh bytes\n",
769 				__func__, __LINE__, lb->dbg_number,
770 				bytes_written);
771 			goto port_full;
772 		}
773 
774 		dev_dbg(&dev->core, "%s:%d free buf_%lu\n", __func__, __LINE__,
775 			lb->dbg_number);
776 
777 		list_del(&lb->link);
778 		kfree(lb);
779 	}
780 
781 	ps3_vuart_disable_interrupt_tx(dev);
782 port_full:
783 	spin_unlock_irqrestore(&priv->tx_list.lock, flags);
784 	dev_dbg(&dev->core, "%s:%d wrote %lxh bytes total\n",
785 		__func__, __LINE__, bytes_total);
786 	return result;
787 }
788 
789 /**
790  * ps3_vuart_handle_interrupt_rx - third stage receive interrupt handler
791  *
792  * Services the receive interrupt for the port.  Creates a list buffer and
793  * copies all waiting port data to that buffer and enqueues the buffer in the
794  * buffer list.  Buffer list data is dequeued via ps3_vuart_read.
795  */
796 
ps3_vuart_handle_interrupt_rx(struct ps3_system_bus_device * dev)797 static int ps3_vuart_handle_interrupt_rx(struct ps3_system_bus_device *dev)
798 {
799 	int result;
800 	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
801 	unsigned long flags;
802 	u64 bytes;
803 
804 	dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
805 
806 	spin_lock_irqsave(&priv->rx_list.lock, flags);
807 	result = ps3_vuart_queue_rx_bytes(dev, &bytes);
808 
809 	if (result) {
810 		spin_unlock_irqrestore(&priv->rx_list.lock, flags);
811 		return result;
812 	}
813 
814 	if (priv->rx_list.work.trigger && priv->rx_list.bytes_held
815 		>= priv->rx_list.work.trigger) {
816 		dev_dbg(&dev->core, "%s:%d: schedule_work %lxh bytes\n",
817 			__func__, __LINE__, priv->rx_list.work.trigger);
818 		priv->rx_list.work.trigger = 0;
819 		schedule_work(&priv->rx_list.work.work);
820 	}
821 
822 	spin_unlock_irqrestore(&priv->rx_list.lock, flags);
823 	return result;
824 }
825 
ps3_vuart_handle_interrupt_disconnect(struct ps3_system_bus_device * dev)826 static int ps3_vuart_handle_interrupt_disconnect(
827 	struct ps3_system_bus_device *dev)
828 {
829 	dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
830 	BUG_ON("no support");
831 	return -1;
832 }
833 
834 /**
835  * ps3_vuart_handle_port_interrupt - second stage interrupt handler
836  *
837  * Services any pending interrupt types for the port.  Passes control to the
838  * third stage type specific interrupt handler.  Returns control to the first
839  * stage handler after one iteration.
840  */
841 
ps3_vuart_handle_port_interrupt(struct ps3_system_bus_device * dev)842 static int ps3_vuart_handle_port_interrupt(struct ps3_system_bus_device *dev)
843 {
844 	int result;
845 	struct ps3_vuart_port_priv *priv = to_port_priv(dev);
846 	unsigned long status;
847 
848 	result = ps3_vuart_get_interrupt_status(dev, &status);
849 
850 	if (result)
851 		return result;
852 
853 	dev_dbg(&dev->core, "%s:%d: status: %lxh\n", __func__, __LINE__,
854 		status);
855 
856 	if (status & INTERRUPT_MASK_DISCONNECT) {
857 		priv->stats.disconnect_interrupts++;
858 		result = ps3_vuart_handle_interrupt_disconnect(dev);
859 		if (result)
860 			ps3_vuart_disable_interrupt_disconnect(dev);
861 	}
862 
863 	if (status & INTERRUPT_MASK_TX) {
864 		priv->stats.tx_interrupts++;
865 		result = ps3_vuart_handle_interrupt_tx(dev);
866 		if (result)
867 			ps3_vuart_disable_interrupt_tx(dev);
868 	}
869 
870 	if (status & INTERRUPT_MASK_RX) {
871 		priv->stats.rx_interrupts++;
872 		result = ps3_vuart_handle_interrupt_rx(dev);
873 		if (result)
874 			ps3_vuart_disable_interrupt_rx(dev);
875 	}
876 
877 	return 0;
878 }
879 
880 struct vuart_bus_priv {
881 	struct ports_bmp *bmp;
882 	unsigned int virq;
883 	struct mutex probe_mutex;
884 	int use_count;
885 	struct ps3_system_bus_device *devices[PORT_COUNT];
886 } static vuart_bus_priv;
887 
888 /**
889  * ps3_vuart_irq_handler - first stage interrupt handler
890  *
891  * Loops finding any interrupting port and its associated instance data.
892  * Passes control to the second stage port specific interrupt handler.  Loops
893  * until all outstanding interrupts are serviced.
894  */
895 
ps3_vuart_irq_handler(int irq,void * _private)896 static irqreturn_t ps3_vuart_irq_handler(int irq, void *_private)
897 {
898 	struct vuart_bus_priv *bus_priv = _private;
899 
900 	BUG_ON(!bus_priv);
901 
902 	while (1) {
903 		unsigned int port;
904 
905 		dump_ports_bmp(bus_priv->bmp);
906 
907 		port = (BITS_PER_LONG - 1) - __ilog2(bus_priv->bmp->status);
908 
909 		if (port == BITS_PER_LONG)
910 			break;
911 
912 		BUG_ON(port >= PORT_COUNT);
913 		BUG_ON(!bus_priv->devices[port]);
914 
915 		ps3_vuart_handle_port_interrupt(bus_priv->devices[port]);
916 	}
917 
918 	return IRQ_HANDLED;
919 }
920 
ps3_vuart_bus_interrupt_get(void)921 static int ps3_vuart_bus_interrupt_get(void)
922 {
923 	int result;
924 
925 	pr_debug(" -> %s:%d\n", __func__, __LINE__);
926 
927 	vuart_bus_priv.use_count++;
928 
929 	BUG_ON(vuart_bus_priv.use_count > 2);
930 
931 	if (vuart_bus_priv.use_count != 1)
932 		return 0;
933 
934 	BUG_ON(vuart_bus_priv.bmp);
935 
936 	vuart_bus_priv.bmp = kzalloc(sizeof(struct ports_bmp), GFP_KERNEL);
937 
938 	if (!vuart_bus_priv.bmp) {
939 		pr_debug("%s:%d: kzalloc failed.\n", __func__, __LINE__);
940 		result = -ENOMEM;
941 		goto fail_bmp_malloc;
942 	}
943 
944 	result = ps3_vuart_irq_setup(PS3_BINDING_CPU_ANY, vuart_bus_priv.bmp,
945 		&vuart_bus_priv.virq);
946 
947 	if (result) {
948 		pr_debug("%s:%d: ps3_vuart_irq_setup failed (%d)\n",
949 			__func__, __LINE__, result);
950 		result = -EPERM;
951 		goto fail_alloc_irq;
952 	}
953 
954 	result = request_irq(vuart_bus_priv.virq, ps3_vuart_irq_handler,
955 		0, "vuart", &vuart_bus_priv);
956 
957 	if (result) {
958 		pr_debug("%s:%d: request_irq failed (%d)\n",
959 			__func__, __LINE__, result);
960 		goto fail_request_irq;
961 	}
962 
963 	pr_debug(" <- %s:%d: ok\n", __func__, __LINE__);
964 	return result;
965 
966 fail_request_irq:
967 	ps3_vuart_irq_destroy(vuart_bus_priv.virq);
968 	vuart_bus_priv.virq = NO_IRQ;
969 fail_alloc_irq:
970 	kfree(vuart_bus_priv.bmp);
971 	vuart_bus_priv.bmp = NULL;
972 fail_bmp_malloc:
973 	vuart_bus_priv.use_count--;
974 	pr_debug(" <- %s:%d: failed\n", __func__, __LINE__);
975 	return result;
976 }
977 
ps3_vuart_bus_interrupt_put(void)978 static int ps3_vuart_bus_interrupt_put(void)
979 {
980 	pr_debug(" -> %s:%d\n", __func__, __LINE__);
981 
982 	vuart_bus_priv.use_count--;
983 
984 	BUG_ON(vuart_bus_priv.use_count < 0);
985 
986 	if (vuart_bus_priv.use_count != 0)
987 		return 0;
988 
989 	free_irq(vuart_bus_priv.virq, &vuart_bus_priv);
990 
991 	ps3_vuart_irq_destroy(vuart_bus_priv.virq);
992 	vuart_bus_priv.virq = NO_IRQ;
993 
994 	kfree(vuart_bus_priv.bmp);
995 	vuart_bus_priv.bmp = NULL;
996 
997 	pr_debug(" <- %s:%d\n", __func__, __LINE__);
998 	return 0;
999 }
1000 
ps3_vuart_probe(struct ps3_system_bus_device * dev)1001 static int ps3_vuart_probe(struct ps3_system_bus_device *dev)
1002 {
1003 	int result;
1004 	struct ps3_vuart_port_driver *drv;
1005 	struct ps3_vuart_port_priv *priv = NULL;
1006 
1007 	dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
1008 
1009 	drv = ps3_system_bus_dev_to_vuart_drv(dev);
1010 
1011 	dev_dbg(&dev->core, "%s:%d: (%s)\n", __func__, __LINE__,
1012 		drv->core.core.name);
1013 
1014 	BUG_ON(!drv);
1015 
1016 	if (dev->port_number >= PORT_COUNT) {
1017 		BUG();
1018 		return -EINVAL;
1019 	}
1020 
1021 	mutex_lock(&vuart_bus_priv.probe_mutex);
1022 
1023 	result = ps3_vuart_bus_interrupt_get();
1024 
1025 	if (result)
1026 		goto fail_setup_interrupt;
1027 
1028 	if (vuart_bus_priv.devices[dev->port_number]) {
1029 		dev_dbg(&dev->core, "%s:%d: port busy (%d)\n", __func__,
1030 			__LINE__, dev->port_number);
1031 		result = -EBUSY;
1032 		goto fail_busy;
1033 	}
1034 
1035 	vuart_bus_priv.devices[dev->port_number] = dev;
1036 
1037 	/* Setup dev->driver_priv. */
1038 
1039 	dev->driver_priv = kzalloc(sizeof(struct ps3_vuart_port_priv),
1040 		GFP_KERNEL);
1041 
1042 	if (!dev->driver_priv) {
1043 		result = -ENOMEM;
1044 		goto fail_dev_malloc;
1045 	}
1046 
1047 	priv = to_port_priv(dev);
1048 
1049 	INIT_LIST_HEAD(&priv->tx_list.head);
1050 	spin_lock_init(&priv->tx_list.lock);
1051 
1052 	INIT_LIST_HEAD(&priv->rx_list.head);
1053 	spin_lock_init(&priv->rx_list.lock);
1054 
1055 	INIT_WORK(&priv->rx_list.work.work, NULL);
1056 	priv->rx_list.work.trigger = 0;
1057 	priv->rx_list.work.dev = dev;
1058 
1059 	/* clear stale pending interrupts */
1060 
1061 	ps3_vuart_clear_rx_bytes(dev, 0);
1062 
1063 	ps3_vuart_set_interrupt_mask(dev, INTERRUPT_MASK_RX);
1064 
1065 	ps3_vuart_set_triggers(dev, 1, 1);
1066 
1067 	if (drv->probe)
1068 		result = drv->probe(dev);
1069 	else {
1070 		result = 0;
1071 		dev_info(&dev->core, "%s:%d: no probe method\n", __func__,
1072 			__LINE__);
1073 	}
1074 
1075 	if (result) {
1076 		dev_dbg(&dev->core, "%s:%d: drv->probe failed\n",
1077 			__func__, __LINE__);
1078 		goto fail_probe;
1079 	}
1080 
1081 	mutex_unlock(&vuart_bus_priv.probe_mutex);
1082 
1083 	return result;
1084 
1085 fail_probe:
1086 	ps3_vuart_set_interrupt_mask(dev, 0);
1087 	kfree(dev->driver_priv);
1088 	dev->driver_priv = NULL;
1089 fail_dev_malloc:
1090 	vuart_bus_priv.devices[dev->port_number] = NULL;
1091 fail_busy:
1092 	ps3_vuart_bus_interrupt_put();
1093 fail_setup_interrupt:
1094 	mutex_unlock(&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 
ps3_vuart_cleanup(struct ps3_system_bus_device * dev)1108 static 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 
ps3_vuart_remove(struct ps3_system_bus_device * dev)1126 static 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 	mutex_lock(&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 		mutex_unlock(&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 	mutex_unlock(&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 
ps3_vuart_shutdown(struct ps3_system_bus_device * dev)1178 static 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 	mutex_lock(&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 		mutex_unlock(&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 	mutex_unlock(&vuart_bus_priv.probe_mutex);
1217 	return 0;
1218 }
1219 
ps3_vuart_bus_init(void)1220 static 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 	mutex_init(&vuart_bus_priv.probe_mutex);
1228 
1229 	return 0;
1230 }
1231 
ps3_vuart_bus_exit(void)1232 static void __exit ps3_vuart_bus_exit(void)
1233 {
1234 	pr_debug("%s:%d:\n", __func__, __LINE__);
1235 }
1236 
1237 core_initcall(ps3_vuart_bus_init);
1238 module_exit(ps3_vuart_bus_exit);
1239 
1240 /**
1241  * ps3_vuart_port_driver_register - Add a vuart port device driver.
1242  */
1243 
ps3_vuart_port_driver_register(struct ps3_vuart_port_driver * drv)1244 int 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 }
1260 EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_register);
1261 
1262 /**
1263  * ps3_vuart_port_driver_unregister - Remove a vuart port device driver.
1264  */
1265 
ps3_vuart_port_driver_unregister(struct ps3_vuart_port_driver * drv)1266 void 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 }
1271 EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_unregister);
1272