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Geoff Levand74e95d5d2006-12-08 18:27:47 -08001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Geoff Levand74e95d5d2006-12-08 18:27:47 -080023#include <linux/module.h>
24#include <linux/interrupt.h>
Geoff Levandea1547d2007-02-06 14:23:47 -080025#include <linux/workqueue.h>
Jiri Slaby1977f032007-10-18 23:40:25 -070026#include <linux/bitops.h>
Geoff Levand74e95d5d2006-12-08 18:27:47 -080027#include <asm/ps3.h>
28
Geoff Levand75c86e72007-02-13 17:37:28 -080029#include <asm/firmware.h>
Geoff Levand74e95d5d2006-12-08 18:27:47 -080030#include <asm/lv1call.h>
Geoff Levand74e95d5d2006-12-08 18:27:47 -080031
32#include "vuart.h"
33
34MODULE_AUTHOR("Sony Corporation");
35MODULE_LICENSE("GPL v2");
Geoff Levand75c86e72007-02-13 17:37:28 -080036MODULE_DESCRIPTION("PS3 vuart");
Geoff Levand74e95d5d2006-12-08 18:27:47 -080037
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
49enum {PORT_COUNT = 3,};
50
51enum 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
62enum vuart_interrupt_bit {
63 INTERRUPT_BIT_TX = 0,
64 INTERRUPT_BIT_RX = 1,
65 INTERRUPT_BIT_DISCONNECT = 2,
66};
67
68enum vuart_interrupt_mask {
69 INTERRUPT_MASK_TX = 1,
70 INTERRUPT_MASK_RX = 2,
71 INTERRUPT_MASK_DISCONNECT = 4,
72};
73
74/**
Geoff Levand7626e782007-06-16 08:01:06 +100075 * struct ps3_vuart_port_priv - private vuart device data.
76 */
77
78struct 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
94static 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/**
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800103 * 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
109struct ports_bmp {
110 u64 status;
111 u64 unused[3];
Geert Uytterhoevend0e5c2182008-01-19 07:32:19 +1100112} __attribute__((aligned(32)));
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800113
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800114#define dump_ports_bmp(_b) _dump_ports_bmp(_b, __func__, __LINE__)
Geoff Levand848cfdc2007-06-16 07:18:14 +1000115static void __maybe_unused _dump_ports_bmp(
Geert Uytterhoevend0e5c2182008-01-19 07:32:19 +1100116 const struct ports_bmp *bmp, const char *func, int line)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800117{
Stephen Rothwella9dad6e2009-01-13 20:10:06 +0000118 pr_debug("%s:%d: ports_bmp: %016llxh\n", func, line, bmp->status);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800119}
120
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800121#define dump_port_params(_b) _dump_port_params(_b, __func__, __LINE__)
Geoff Levand848cfdc2007-06-16 07:18:14 +1000122static void __maybe_unused _dump_port_params(unsigned int port_number,
Geert Uytterhoevend0e5c2182008-01-19 07:32:19 +1100123 const char *func, int line)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800124{
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
Geoff Levand7626e782007-06-16 08:01:06 +1000154int ps3_vuart_get_triggers(struct ps3_system_bus_device *dev,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800155 struct vuart_triggers *trig)
156{
157 int result;
Stephen Rothwellb17b3df2009-01-13 19:59:41 +0000158 u64 size;
159 u64 val;
160 u64 tx;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800161
Geoff Levand7626e782007-06-16 08:01:06 +1000162 result = lv1_get_virtual_uart_param(dev->port_number,
Stephen Rothwellb17b3df2009-01-13 19:59:41 +0000163 PARAM_TX_TRIGGER, &tx);
164 trig->tx = tx;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800165
166 if (result) {
167 dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n",
168 __func__, __LINE__, ps3_result(result));
169 return result;
170 }
171
Geoff Levand7626e782007-06-16 08:01:06 +1000172 result = lv1_get_virtual_uart_param(dev->port_number,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800173 PARAM_RX_BUF_SIZE, &size);
174
175 if (result) {
176 dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n",
177 __func__, __LINE__, ps3_result(result));
178 return result;
179 }
180
Geoff Levand7626e782007-06-16 08:01:06 +1000181 result = lv1_get_virtual_uart_param(dev->port_number,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800182 PARAM_RX_TRIGGER, &val);
183
184 if (result) {
185 dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n",
186 __func__, __LINE__, ps3_result(result));
187 return result;
188 }
189
190 trig->rx = size - val;
191
192 dev_dbg(&dev->core, "%s:%d: tx %lxh, rx %lxh\n", __func__, __LINE__,
193 trig->tx, trig->rx);
194
195 return result;
196}
197
Geoff Levand7626e782007-06-16 08:01:06 +1000198int ps3_vuart_set_triggers(struct ps3_system_bus_device *dev, unsigned int tx,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800199 unsigned int rx)
200{
201 int result;
Stephen Rothwellb17b3df2009-01-13 19:59:41 +0000202 u64 size;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800203
Geoff Levand7626e782007-06-16 08:01:06 +1000204 result = lv1_set_virtual_uart_param(dev->port_number,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800205 PARAM_TX_TRIGGER, tx);
206
207 if (result) {
208 dev_dbg(&dev->core, "%s:%d: tx_trigger failed: %s\n",
209 __func__, __LINE__, ps3_result(result));
210 return result;
211 }
212
Geoff Levand7626e782007-06-16 08:01:06 +1000213 result = lv1_get_virtual_uart_param(dev->port_number,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800214 PARAM_RX_BUF_SIZE, &size);
215
216 if (result) {
217 dev_dbg(&dev->core, "%s:%d: tx_buf_size failed: %s\n",
218 __func__, __LINE__, ps3_result(result));
219 return result;
220 }
221
Geoff Levand7626e782007-06-16 08:01:06 +1000222 result = lv1_set_virtual_uart_param(dev->port_number,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800223 PARAM_RX_TRIGGER, size - rx);
224
225 if (result) {
226 dev_dbg(&dev->core, "%s:%d: rx_trigger failed: %s\n",
227 __func__, __LINE__, ps3_result(result));
228 return result;
229 }
230
231 dev_dbg(&dev->core, "%s:%d: tx %xh, rx %xh\n", __func__, __LINE__,
232 tx, rx);
233
234 return result;
235}
236
Geoff Levand7626e782007-06-16 08:01:06 +1000237static int ps3_vuart_get_rx_bytes_waiting(struct ps3_system_bus_device *dev,
Geoff Levand75c86e72007-02-13 17:37:28 -0800238 u64 *bytes_waiting)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800239{
Geoff Levand7626e782007-06-16 08:01:06 +1000240 int result;
241
242 result = lv1_get_virtual_uart_param(dev->port_number,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800243 PARAM_RX_BYTES, bytes_waiting);
244
245 if (result)
246 dev_dbg(&dev->core, "%s:%d: rx_bytes failed: %s\n",
247 __func__, __LINE__, ps3_result(result));
248
Stephen Rothwella9dad6e2009-01-13 20:10:06 +0000249 dev_dbg(&dev->core, "%s:%d: %llxh\n", __func__, __LINE__,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800250 *bytes_waiting);
251 return result;
252}
253
Geoff Levand7626e782007-06-16 08:01:06 +1000254/**
255 * ps3_vuart_set_interrupt_mask - Enable/disable the port interrupt sources.
256 * @dev: The struct ps3_system_bus_device instance.
257 * @bmp: Logical OR of enum vuart_interrupt_mask values. A zero bit disables.
258 */
259
260static int ps3_vuart_set_interrupt_mask(struct ps3_system_bus_device *dev,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800261 unsigned long mask)
262{
263 int result;
Geoff Levand7626e782007-06-16 08:01:06 +1000264 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800265
266 dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__, mask);
267
Geoff Levand7626e782007-06-16 08:01:06 +1000268 priv->interrupt_mask = mask;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800269
Geoff Levand7626e782007-06-16 08:01:06 +1000270 result = lv1_set_virtual_uart_param(dev->port_number,
271 PARAM_INTERRUPT_MASK, priv->interrupt_mask);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800272
273 if (result)
274 dev_dbg(&dev->core, "%s:%d: interrupt_mask failed: %s\n",
275 __func__, __LINE__, ps3_result(result));
276
277 return result;
278}
279
Geoff Levand7626e782007-06-16 08:01:06 +1000280static int ps3_vuart_get_interrupt_status(struct ps3_system_bus_device *dev,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800281 unsigned long *status)
282{
Geoff Levand7626e782007-06-16 08:01:06 +1000283 int result;
284 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand75c86e72007-02-13 17:37:28 -0800285 u64 tmp;
Geoff Levand7626e782007-06-16 08:01:06 +1000286
287 result = lv1_get_virtual_uart_param(dev->port_number,
Geoff Levand75c86e72007-02-13 17:37:28 -0800288 PARAM_INTERRUPT_STATUS, &tmp);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800289
290 if (result)
291 dev_dbg(&dev->core, "%s:%d: interrupt_status failed: %s\n",
292 __func__, __LINE__, ps3_result(result));
293
Geoff Levand7626e782007-06-16 08:01:06 +1000294 *status = tmp & priv->interrupt_mask;
Geoff Levand75c86e72007-02-13 17:37:28 -0800295
Stephen Rothwella9dad6e2009-01-13 20:10:06 +0000296 dev_dbg(&dev->core, "%s:%d: m %llxh, s %llxh, m&s %lxh\n",
Geoff Levand7626e782007-06-16 08:01:06 +1000297 __func__, __LINE__, priv->interrupt_mask, tmp, *status);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800298
299 return result;
300}
301
Geoff Levand7626e782007-06-16 08:01:06 +1000302int ps3_vuart_enable_interrupt_tx(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800303{
Geoff Levand7626e782007-06-16 08:01:06 +1000304 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
305
306 return (priv->interrupt_mask & INTERRUPT_MASK_TX) ? 0
307 : ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800308 | INTERRUPT_MASK_TX);
309}
310
Geoff Levand7626e782007-06-16 08:01:06 +1000311int ps3_vuart_enable_interrupt_rx(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800312{
Geoff Levand7626e782007-06-16 08:01:06 +1000313 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
314
315 return (priv->interrupt_mask & INTERRUPT_MASK_RX) ? 0
316 : ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800317 | INTERRUPT_MASK_RX);
318}
319
Geoff Levand7626e782007-06-16 08:01:06 +1000320int ps3_vuart_enable_interrupt_disconnect(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800321{
Geoff Levand7626e782007-06-16 08:01:06 +1000322 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
323
324 return (priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT) ? 0
325 : ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800326 | INTERRUPT_MASK_DISCONNECT);
327}
328
Geoff Levand7626e782007-06-16 08:01:06 +1000329int ps3_vuart_disable_interrupt_tx(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800330{
Geoff Levand7626e782007-06-16 08:01:06 +1000331 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
332
333 return (priv->interrupt_mask & INTERRUPT_MASK_TX)
334 ? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800335 & ~INTERRUPT_MASK_TX) : 0;
336}
337
Geoff Levand7626e782007-06-16 08:01:06 +1000338int ps3_vuart_disable_interrupt_rx(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800339{
Geoff Levand7626e782007-06-16 08:01:06 +1000340 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
341
342 return (priv->interrupt_mask & INTERRUPT_MASK_RX)
343 ? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800344 & ~INTERRUPT_MASK_RX) : 0;
345}
346
Geoff Levand7626e782007-06-16 08:01:06 +1000347int ps3_vuart_disable_interrupt_disconnect(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800348{
Geoff Levand7626e782007-06-16 08:01:06 +1000349 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
350
351 return (priv->interrupt_mask & INTERRUPT_MASK_DISCONNECT)
352 ? ps3_vuart_set_interrupt_mask(dev, priv->interrupt_mask
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800353 & ~INTERRUPT_MASK_DISCONNECT) : 0;
354}
355
356/**
357 * ps3_vuart_raw_write - Low level write helper.
Geoff Levand7626e782007-06-16 08:01:06 +1000358 * @dev: The struct ps3_system_bus_device instance.
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800359 *
360 * Do not call ps3_vuart_raw_write directly, use ps3_vuart_write.
361 */
362
Geoff Levand7626e782007-06-16 08:01:06 +1000363static int ps3_vuart_raw_write(struct ps3_system_bus_device *dev,
Stephen Rothwellb17b3df2009-01-13 19:59:41 +0000364 const void *buf, unsigned int bytes, u64 *bytes_written)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800365{
366 int result;
Geoff Levand7626e782007-06-16 08:01:06 +1000367 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800368
Geoff Levand7626e782007-06-16 08:01:06 +1000369 result = lv1_write_virtual_uart(dev->port_number,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800370 ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_written);
371
372 if (result) {
373 dev_dbg(&dev->core, "%s:%d: lv1_write_virtual_uart failed: "
374 "%s\n", __func__, __LINE__, ps3_result(result));
375 return result;
376 }
377
Geoff Levand7626e782007-06-16 08:01:06 +1000378 priv->stats.bytes_written += *bytes_written;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800379
Stephen Rothwellb17b3df2009-01-13 19:59:41 +0000380 dev_dbg(&dev->core, "%s:%d: wrote %llxh/%xh=>%lxh\n", __func__, __LINE__,
Geoff Levand7626e782007-06-16 08:01:06 +1000381 *bytes_written, bytes, priv->stats.bytes_written);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800382
383 return result;
384}
385
386/**
387 * ps3_vuart_raw_read - Low level read helper.
Geoff Levand7626e782007-06-16 08:01:06 +1000388 * @dev: The struct ps3_system_bus_device instance.
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800389 *
390 * Do not call ps3_vuart_raw_read directly, use ps3_vuart_read.
391 */
392
Geoff Levand7626e782007-06-16 08:01:06 +1000393static int ps3_vuart_raw_read(struct ps3_system_bus_device *dev, void *buf,
Stephen Rothwellb17b3df2009-01-13 19:59:41 +0000394 unsigned int bytes, u64 *bytes_read)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800395{
396 int result;
Geoff Levand7626e782007-06-16 08:01:06 +1000397 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800398
399 dev_dbg(&dev->core, "%s:%d: %xh\n", __func__, __LINE__, bytes);
400
Geoff Levand7626e782007-06-16 08:01:06 +1000401 result = lv1_read_virtual_uart(dev->port_number,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800402 ps3_mm_phys_to_lpar(__pa(buf)), bytes, bytes_read);
403
404 if (result) {
405 dev_dbg(&dev->core, "%s:%d: lv1_read_virtual_uart failed: %s\n",
406 __func__, __LINE__, ps3_result(result));
407 return result;
408 }
409
Geoff Levand7626e782007-06-16 08:01:06 +1000410 priv->stats.bytes_read += *bytes_read;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800411
Stephen Rothwellb17b3df2009-01-13 19:59:41 +0000412 dev_dbg(&dev->core, "%s:%d: read %llxh/%xh=>%lxh\n", __func__, __LINE__,
Geoff Levand7626e782007-06-16 08:01:06 +1000413 *bytes_read, bytes, priv->stats.bytes_read);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800414
415 return result;
416}
417
418/**
Geoff Levand75c86e72007-02-13 17:37:28 -0800419 * ps3_vuart_clear_rx_bytes - Discard bytes received.
Geoff Levand7626e782007-06-16 08:01:06 +1000420 * @dev: The struct ps3_system_bus_device instance.
Geoff Levand75c86e72007-02-13 17:37:28 -0800421 * @bytes: Max byte count to discard, zero = all pending.
422 *
423 * Used to clear pending rx interrupt source. Will not block.
424 */
425
Geoff Levand7626e782007-06-16 08:01:06 +1000426void ps3_vuart_clear_rx_bytes(struct ps3_system_bus_device *dev,
Geoff Levand75c86e72007-02-13 17:37:28 -0800427 unsigned int bytes)
428{
429 int result;
Geoff Levand7626e782007-06-16 08:01:06 +1000430 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand75c86e72007-02-13 17:37:28 -0800431 u64 bytes_waiting;
Geert Uytterhoevend0e5c2182008-01-19 07:32:19 +1100432 void *tmp;
Geoff Levand75c86e72007-02-13 17:37:28 -0800433
434 result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes_waiting);
435
436 BUG_ON(result);
437
438 bytes = bytes ? min(bytes, (unsigned int)bytes_waiting) : bytes_waiting;
439
440 dev_dbg(&dev->core, "%s:%d: %u\n", __func__, __LINE__, bytes);
441
442 if (!bytes)
443 return;
444
445 /* Add some extra space for recently arrived data. */
446
447 bytes += 128;
448
449 tmp = kmalloc(bytes, GFP_KERNEL);
450
451 if (!tmp)
452 return;
453
454 ps3_vuart_raw_read(dev, tmp, bytes, &bytes_waiting);
455
456 kfree(tmp);
457
458 /* Don't include these bytes in the stats. */
459
Geoff Levand7626e782007-06-16 08:01:06 +1000460 priv->stats.bytes_read -= bytes_waiting;
Geoff Levand75c86e72007-02-13 17:37:28 -0800461}
Geoff Levand7626e782007-06-16 08:01:06 +1000462EXPORT_SYMBOL_GPL(ps3_vuart_clear_rx_bytes);
Geoff Levand75c86e72007-02-13 17:37:28 -0800463
464/**
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800465 * struct list_buffer - An element for a port device fifo buffer list.
466 */
467
468struct list_buffer {
469 struct list_head link;
470 const unsigned char *head;
471 const unsigned char *tail;
472 unsigned long dbg_number;
473 unsigned char data[];
474};
475
476/**
477 * ps3_vuart_write - the entry point for writing data to a port
Geoff Levand7626e782007-06-16 08:01:06 +1000478 * @dev: The struct ps3_system_bus_device instance.
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800479 *
480 * If the port is idle on entry as much of the incoming data is written to
481 * the port as the port will accept. Otherwise a list buffer is created
482 * and any remaning incoming data is copied to that buffer. The buffer is
483 * then enqueued for transmision via the transmit interrupt.
484 */
485
Geoff Levand7626e782007-06-16 08:01:06 +1000486int ps3_vuart_write(struct ps3_system_bus_device *dev, const void *buf,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800487 unsigned int bytes)
488{
489 static unsigned long dbg_number;
490 int result;
Geoff Levand7626e782007-06-16 08:01:06 +1000491 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800492 unsigned long flags;
493 struct list_buffer *lb;
494
495 dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
496 bytes, bytes);
497
Geoff Levand7626e782007-06-16 08:01:06 +1000498 spin_lock_irqsave(&priv->tx_list.lock, flags);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800499
Geoff Levand7626e782007-06-16 08:01:06 +1000500 if (list_empty(&priv->tx_list.head)) {
Stephen Rothwellb17b3df2009-01-13 19:59:41 +0000501 u64 bytes_written;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800502
503 result = ps3_vuart_raw_write(dev, buf, bytes, &bytes_written);
504
Geoff Levand7626e782007-06-16 08:01:06 +1000505 spin_unlock_irqrestore(&priv->tx_list.lock, flags);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800506
507 if (result) {
508 dev_dbg(&dev->core,
509 "%s:%d: ps3_vuart_raw_write failed\n",
510 __func__, __LINE__);
511 return result;
512 }
513
514 if (bytes_written == bytes) {
515 dev_dbg(&dev->core, "%s:%d: wrote %xh bytes\n",
516 __func__, __LINE__, bytes);
517 return 0;
518 }
519
520 bytes -= bytes_written;
521 buf += bytes_written;
522 } else
Geoff Levand7626e782007-06-16 08:01:06 +1000523 spin_unlock_irqrestore(&priv->tx_list.lock, flags);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800524
525 lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_KERNEL);
526
Geert Uytterhoevend0e5c2182008-01-19 07:32:19 +1100527 if (!lb)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800528 return -ENOMEM;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800529
530 memcpy(lb->data, buf, bytes);
531 lb->head = lb->data;
532 lb->tail = lb->data + bytes;
533 lb->dbg_number = ++dbg_number;
534
Geoff Levand7626e782007-06-16 08:01:06 +1000535 spin_lock_irqsave(&priv->tx_list.lock, flags);
536 list_add_tail(&lb->link, &priv->tx_list.head);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800537 ps3_vuart_enable_interrupt_tx(dev);
Geoff Levand7626e782007-06-16 08:01:06 +1000538 spin_unlock_irqrestore(&priv->tx_list.lock, flags);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800539
540 dev_dbg(&dev->core, "%s:%d: queued buf_%lu, %xh bytes\n",
541 __func__, __LINE__, lb->dbg_number, bytes);
542
543 return 0;
544}
Geoff Levand7626e782007-06-16 08:01:06 +1000545EXPORT_SYMBOL_GPL(ps3_vuart_write);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800546
547/**
Geoff Levand7626e782007-06-16 08:01:06 +1000548 * ps3_vuart_queue_rx_bytes - Queue waiting bytes into the buffer list.
549 * @dev: The struct ps3_system_bus_device instance.
550 * @bytes_queued: Number of bytes queued to the buffer list.
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800551 *
Geoff Levand7626e782007-06-16 08:01:06 +1000552 * Must be called with priv->rx_list.lock held.
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800553 */
554
Geoff Levand7626e782007-06-16 08:01:06 +1000555static int ps3_vuart_queue_rx_bytes(struct ps3_system_bus_device *dev,
556 u64 *bytes_queued)
557{
558 static unsigned long dbg_number;
559 int result;
560 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
561 struct list_buffer *lb;
562 u64 bytes;
563
564 *bytes_queued = 0;
565
566 result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes);
567 BUG_ON(result);
568
569 if (result)
570 return -EIO;
571
572 if (!bytes)
573 return 0;
574
575 /* Add some extra space for recently arrived data. */
576
577 bytes += 128;
578
579 lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_ATOMIC);
580
581 if (!lb)
582 return -ENOMEM;
583
584 ps3_vuart_raw_read(dev, lb->data, bytes, &bytes);
585
586 lb->head = lb->data;
587 lb->tail = lb->data + bytes;
588 lb->dbg_number = ++dbg_number;
589
590 list_add_tail(&lb->link, &priv->rx_list.head);
591 priv->rx_list.bytes_held += bytes;
592
Stephen Rothwella9dad6e2009-01-13 20:10:06 +0000593 dev_dbg(&dev->core, "%s:%d: buf_%lu: queued %llxh bytes\n",
Geoff Levand7626e782007-06-16 08:01:06 +1000594 __func__, __LINE__, lb->dbg_number, bytes);
595
596 *bytes_queued = bytes;
597
598 return 0;
599}
600
601/**
602 * ps3_vuart_read - The entry point for reading data from a port.
603 *
604 * Queue data waiting at the port, and if enough bytes to satisfy the request
605 * are held in the buffer list those bytes are dequeued and copied to the
606 * caller's buffer. Emptied list buffers are retiered. If the request cannot
607 * be statified by bytes held in the list buffers -EAGAIN is returned.
608 */
609
610int ps3_vuart_read(struct ps3_system_bus_device *dev, void *buf,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800611 unsigned int bytes)
612{
Geoff Levand7626e782007-06-16 08:01:06 +1000613 int result;
614 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800615 unsigned long flags;
616 struct list_buffer *lb, *n;
617 unsigned long bytes_read;
618
619 dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
620 bytes, bytes);
621
Geoff Levand7626e782007-06-16 08:01:06 +1000622 spin_lock_irqsave(&priv->rx_list.lock, flags);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800623
Geoff Levand7626e782007-06-16 08:01:06 +1000624 /* Queue rx bytes here for polled reads. */
625
626 while (priv->rx_list.bytes_held < bytes) {
627 u64 tmp;
628
629 result = ps3_vuart_queue_rx_bytes(dev, &tmp);
630 if (result || !tmp) {
631 dev_dbg(&dev->core, "%s:%d: starved for %lxh bytes\n",
632 __func__, __LINE__,
633 bytes - priv->rx_list.bytes_held);
634 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
635 return -EAGAIN;
636 }
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800637 }
638
Geoff Levand7626e782007-06-16 08:01:06 +1000639 list_for_each_entry_safe(lb, n, &priv->rx_list.head, link) {
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800640 bytes_read = min((unsigned int)(lb->tail - lb->head), bytes);
641
642 memcpy(buf, lb->head, bytes_read);
643 buf += bytes_read;
644 bytes -= bytes_read;
Geoff Levand7626e782007-06-16 08:01:06 +1000645 priv->rx_list.bytes_held -= bytes_read;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800646
647 if (bytes_read < lb->tail - lb->head) {
648 lb->head += bytes_read;
Geoff Levand75c86e72007-02-13 17:37:28 -0800649 dev_dbg(&dev->core, "%s:%d: buf_%lu: dequeued %lxh "
650 "bytes\n", __func__, __LINE__, lb->dbg_number,
651 bytes_read);
Geoff Levand7626e782007-06-16 08:01:06 +1000652 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800653 return 0;
654 }
655
Geoff Levand75c86e72007-02-13 17:37:28 -0800656 dev_dbg(&dev->core, "%s:%d: buf_%lu: free, dequeued %lxh "
657 "bytes\n", __func__, __LINE__, lb->dbg_number,
658 bytes_read);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800659
660 list_del(&lb->link);
661 kfree(lb);
662 }
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800663
Geoff Levand7626e782007-06-16 08:01:06 +1000664 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800665 return 0;
666}
Geoff Levand7626e782007-06-16 08:01:06 +1000667EXPORT_SYMBOL_GPL(ps3_vuart_read);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800668
Geoff Levand7626e782007-06-16 08:01:06 +1000669/**
670 * ps3_vuart_work - Asynchronous read handler.
671 */
672
673static void ps3_vuart_work(struct work_struct *work)
Geoff Levandea1547d2007-02-06 14:23:47 -0800674{
Geoff Levand7626e782007-06-16 08:01:06 +1000675 struct ps3_system_bus_device *dev =
676 ps3_vuart_work_to_system_bus_dev(work);
677 struct ps3_vuart_port_driver *drv =
678 ps3_system_bus_dev_to_vuart_drv(dev);
679
680 BUG_ON(!drv);
681 drv->work(dev);
682}
683
684int ps3_vuart_read_async(struct ps3_system_bus_device *dev, unsigned int bytes)
685{
686 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levandea1547d2007-02-06 14:23:47 -0800687 unsigned long flags;
688
Geoff Levand7626e782007-06-16 08:01:06 +1000689 if (priv->rx_list.work.trigger) {
Geoff Levandea1547d2007-02-06 14:23:47 -0800690 dev_dbg(&dev->core, "%s:%d: warning, multiple calls\n",
691 __func__, __LINE__);
692 return -EAGAIN;
693 }
694
695 BUG_ON(!bytes);
696
Geoff Levand7626e782007-06-16 08:01:06 +1000697 spin_lock_irqsave(&priv->rx_list.lock, flags);
698 if (priv->rx_list.bytes_held >= bytes) {
Geoff Levandea1547d2007-02-06 14:23:47 -0800699 dev_dbg(&dev->core, "%s:%d: schedule_work %xh bytes\n",
700 __func__, __LINE__, bytes);
Geoff Levand7626e782007-06-16 08:01:06 +1000701 schedule_work(&priv->rx_list.work.work);
702 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
Geoff Levandea1547d2007-02-06 14:23:47 -0800703 return 0;
704 }
705
Geoff Levand7626e782007-06-16 08:01:06 +1000706 priv->rx_list.work.trigger = bytes;
707 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
Geoff Levandea1547d2007-02-06 14:23:47 -0800708
709 dev_dbg(&dev->core, "%s:%d: waiting for %u(%xh) bytes\n", __func__,
710 __LINE__, bytes, bytes);
711
712 return 0;
713}
Geoff Levand7626e782007-06-16 08:01:06 +1000714EXPORT_SYMBOL_GPL(ps3_vuart_read_async);
Geoff Levandea1547d2007-02-06 14:23:47 -0800715
Geoff Levand7626e782007-06-16 08:01:06 +1000716void ps3_vuart_cancel_async(struct ps3_system_bus_device *dev)
Geoff Levandea1547d2007-02-06 14:23:47 -0800717{
Geoff Levand7626e782007-06-16 08:01:06 +1000718 to_port_priv(dev)->rx_list.work.trigger = 0;
Geoff Levandea1547d2007-02-06 14:23:47 -0800719}
Geoff Levand7626e782007-06-16 08:01:06 +1000720EXPORT_SYMBOL_GPL(ps3_vuart_cancel_async);
Geoff Levandea1547d2007-02-06 14:23:47 -0800721
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800722/**
723 * ps3_vuart_handle_interrupt_tx - third stage transmit interrupt handler
724 *
725 * Services the transmit interrupt for the port. Writes as much data from the
726 * buffer list as the port will accept. Retires any emptied list buffers and
727 * adjusts the final list buffer state for a partial write.
728 */
729
Geoff Levand7626e782007-06-16 08:01:06 +1000730static int ps3_vuart_handle_interrupt_tx(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800731{
732 int result = 0;
Geoff Levand7626e782007-06-16 08:01:06 +1000733 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800734 unsigned long flags;
735 struct list_buffer *lb, *n;
736 unsigned long bytes_total = 0;
737
738 dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
739
Geoff Levand7626e782007-06-16 08:01:06 +1000740 spin_lock_irqsave(&priv->tx_list.lock, flags);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800741
Geoff Levand7626e782007-06-16 08:01:06 +1000742 list_for_each_entry_safe(lb, n, &priv->tx_list.head, link) {
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800743
Stephen Rothwellb17b3df2009-01-13 19:59:41 +0000744 u64 bytes_written;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800745
746 result = ps3_vuart_raw_write(dev, lb->head, lb->tail - lb->head,
747 &bytes_written);
748
749 if (result) {
750 dev_dbg(&dev->core,
751 "%s:%d: ps3_vuart_raw_write failed\n",
752 __func__, __LINE__);
753 break;
754 }
755
756 bytes_total += bytes_written;
757
758 if (bytes_written < lb->tail - lb->head) {
759 lb->head += bytes_written;
760 dev_dbg(&dev->core,
Stephen Rothwellb17b3df2009-01-13 19:59:41 +0000761 "%s:%d cleared buf_%lu, %llxh bytes\n",
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800762 __func__, __LINE__, lb->dbg_number,
763 bytes_written);
764 goto port_full;
765 }
766
767 dev_dbg(&dev->core, "%s:%d free buf_%lu\n", __func__, __LINE__,
768 lb->dbg_number);
769
770 list_del(&lb->link);
771 kfree(lb);
772 }
773
774 ps3_vuart_disable_interrupt_tx(dev);
775port_full:
Geoff Levand7626e782007-06-16 08:01:06 +1000776 spin_unlock_irqrestore(&priv->tx_list.lock, flags);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800777 dev_dbg(&dev->core, "%s:%d wrote %lxh bytes total\n",
778 __func__, __LINE__, bytes_total);
779 return result;
780}
781
782/**
783 * ps3_vuart_handle_interrupt_rx - third stage receive interrupt handler
784 *
785 * Services the receive interrupt for the port. Creates a list buffer and
786 * copies all waiting port data to that buffer and enqueues the buffer in the
787 * buffer list. Buffer list data is dequeued via ps3_vuart_read.
788 */
789
Geoff Levand7626e782007-06-16 08:01:06 +1000790static int ps3_vuart_handle_interrupt_rx(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800791{
Geoff Levand7626e782007-06-16 08:01:06 +1000792 int result;
793 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800794 unsigned long flags;
Geoff Levand7626e782007-06-16 08:01:06 +1000795 u64 bytes;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800796
797 dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
798
Geoff Levand7626e782007-06-16 08:01:06 +1000799 spin_lock_irqsave(&priv->rx_list.lock, flags);
800 result = ps3_vuart_queue_rx_bytes(dev, &bytes);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800801
Geoff Levand7626e782007-06-16 08:01:06 +1000802 if (result) {
803 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
804 return result;
Geoff Levandea1547d2007-02-06 14:23:47 -0800805 }
Geoff Levand7626e782007-06-16 08:01:06 +1000806
807 if (priv->rx_list.work.trigger && priv->rx_list.bytes_held
808 >= priv->rx_list.work.trigger) {
809 dev_dbg(&dev->core, "%s:%d: schedule_work %lxh bytes\n",
810 __func__, __LINE__, priv->rx_list.work.trigger);
811 priv->rx_list.work.trigger = 0;
812 schedule_work(&priv->rx_list.work.work);
813 }
814
815 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
816 return result;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800817}
818
819static int ps3_vuart_handle_interrupt_disconnect(
Geoff Levand7626e782007-06-16 08:01:06 +1000820 struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800821{
822 dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
823 BUG_ON("no support");
824 return -1;
825}
826
827/**
828 * ps3_vuart_handle_port_interrupt - second stage interrupt handler
829 *
830 * Services any pending interrupt types for the port. Passes control to the
831 * third stage type specific interrupt handler. Returns control to the first
832 * stage handler after one iteration.
833 */
834
Geoff Levand7626e782007-06-16 08:01:06 +1000835static int ps3_vuart_handle_port_interrupt(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800836{
837 int result;
Geoff Levand7626e782007-06-16 08:01:06 +1000838 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800839 unsigned long status;
840
Geoff Levand75c86e72007-02-13 17:37:28 -0800841 result = ps3_vuart_get_interrupt_status(dev, &status);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800842
843 if (result)
844 return result;
845
846 dev_dbg(&dev->core, "%s:%d: status: %lxh\n", __func__, __LINE__,
847 status);
848
849 if (status & INTERRUPT_MASK_DISCONNECT) {
Geoff Levand7626e782007-06-16 08:01:06 +1000850 priv->stats.disconnect_interrupts++;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800851 result = ps3_vuart_handle_interrupt_disconnect(dev);
852 if (result)
853 ps3_vuart_disable_interrupt_disconnect(dev);
854 }
855
856 if (status & INTERRUPT_MASK_TX) {
Geoff Levand7626e782007-06-16 08:01:06 +1000857 priv->stats.tx_interrupts++;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800858 result = ps3_vuart_handle_interrupt_tx(dev);
859 if (result)
860 ps3_vuart_disable_interrupt_tx(dev);
861 }
862
863 if (status & INTERRUPT_MASK_RX) {
Geoff Levand7626e782007-06-16 08:01:06 +1000864 priv->stats.rx_interrupts++;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800865 result = ps3_vuart_handle_interrupt_rx(dev);
866 if (result)
867 ps3_vuart_disable_interrupt_rx(dev);
868 }
869
870 return 0;
871}
872
Geoff Levand75c86e72007-02-13 17:37:28 -0800873struct vuart_bus_priv {
Geoff Levand7626e782007-06-16 08:01:06 +1000874 struct ports_bmp *bmp;
Geoff Levand75c86e72007-02-13 17:37:28 -0800875 unsigned int virq;
Geoff Levandc4e67522008-01-19 07:32:53 +1100876 struct mutex probe_mutex;
Geoff Levand75c86e72007-02-13 17:37:28 -0800877 int use_count;
Geoff Levand7626e782007-06-16 08:01:06 +1000878 struct ps3_system_bus_device *devices[PORT_COUNT];
Geoff Levand75c86e72007-02-13 17:37:28 -0800879} static vuart_bus_priv;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800880
881/**
882 * ps3_vuart_irq_handler - first stage interrupt handler
883 *
884 * Loops finding any interrupting port and its associated instance data.
885 * Passes control to the second stage port specific interrupt handler. Loops
886 * until all outstanding interrupts are serviced.
887 */
888
889static irqreturn_t ps3_vuart_irq_handler(int irq, void *_private)
890{
Geoff Levand7626e782007-06-16 08:01:06 +1000891 struct vuart_bus_priv *bus_priv = _private;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800892
Geoff Levand7626e782007-06-16 08:01:06 +1000893 BUG_ON(!bus_priv);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800894
895 while (1) {
896 unsigned int port;
897
Geoff Levand7626e782007-06-16 08:01:06 +1000898 dump_ports_bmp(bus_priv->bmp);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800899
Geoff Levand7626e782007-06-16 08:01:06 +1000900 port = (BITS_PER_LONG - 1) - __ilog2(bus_priv->bmp->status);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800901
902 if (port == BITS_PER_LONG)
903 break;
904
905 BUG_ON(port >= PORT_COUNT);
Geoff Levand75c86e72007-02-13 17:37:28 -0800906 BUG_ON(!bus_priv->devices[port]);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800907
Geoff Levand75c86e72007-02-13 17:37:28 -0800908 ps3_vuart_handle_port_interrupt(bus_priv->devices[port]);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800909 }
910
911 return IRQ_HANDLED;
912}
913
Geoff Levand7626e782007-06-16 08:01:06 +1000914static int ps3_vuart_bus_interrupt_get(void)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800915{
916 int result;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800917
Geoff Levand7626e782007-06-16 08:01:06 +1000918 pr_debug(" -> %s:%d\n", __func__, __LINE__);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800919
Geoff Levand7626e782007-06-16 08:01:06 +1000920 vuart_bus_priv.use_count++;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800921
Geoff Levand7626e782007-06-16 08:01:06 +1000922 BUG_ON(vuart_bus_priv.use_count > 2);
923
Geert Uytterhoevend0e5c2182008-01-19 07:32:19 +1100924 if (vuart_bus_priv.use_count != 1)
Geoff Levand7626e782007-06-16 08:01:06 +1000925 return 0;
Geoff Levand7626e782007-06-16 08:01:06 +1000926
927 BUG_ON(vuart_bus_priv.bmp);
928
929 vuart_bus_priv.bmp = kzalloc(sizeof(struct ports_bmp), GFP_KERNEL);
930
931 if (!vuart_bus_priv.bmp) {
932 pr_debug("%s:%d: kzalloc failed.\n", __func__, __LINE__);
933 result = -ENOMEM;
934 goto fail_bmp_malloc;
935 }
936
937 result = ps3_vuart_irq_setup(PS3_BINDING_CPU_ANY, vuart_bus_priv.bmp,
938 &vuart_bus_priv.virq);
939
940 if (result) {
941 pr_debug("%s:%d: ps3_vuart_irq_setup failed (%d)\n",
942 __func__, __LINE__, result);
943 result = -EPERM;
944 goto fail_alloc_irq;
945 }
946
947 result = request_irq(vuart_bus_priv.virq, ps3_vuart_irq_handler,
Yong Zhang6ea741a2011-10-21 23:56:53 +0000948 0, "vuart", &vuart_bus_priv);
Geoff Levand7626e782007-06-16 08:01:06 +1000949
950 if (result) {
951 pr_debug("%s:%d: request_irq failed (%d)\n",
952 __func__, __LINE__, result);
953 goto fail_request_irq;
954 }
955
956 pr_debug(" <- %s:%d: ok\n", __func__, __LINE__);
957 return result;
958
959fail_request_irq:
960 ps3_vuart_irq_destroy(vuart_bus_priv.virq);
961 vuart_bus_priv.virq = NO_IRQ;
962fail_alloc_irq:
963 kfree(vuart_bus_priv.bmp);
964 vuart_bus_priv.bmp = NULL;
965fail_bmp_malloc:
966 vuart_bus_priv.use_count--;
967 pr_debug(" <- %s:%d: failed\n", __func__, __LINE__);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800968 return result;
969}
970
Geoff Levand7626e782007-06-16 08:01:06 +1000971static int ps3_vuart_bus_interrupt_put(void)
972{
973 pr_debug(" -> %s:%d\n", __func__, __LINE__);
974
975 vuart_bus_priv.use_count--;
976
977 BUG_ON(vuart_bus_priv.use_count < 0);
978
979 if (vuart_bus_priv.use_count != 0)
980 return 0;
981
982 free_irq(vuart_bus_priv.virq, &vuart_bus_priv);
983
984 ps3_vuart_irq_destroy(vuart_bus_priv.virq);
985 vuart_bus_priv.virq = NO_IRQ;
986
987 kfree(vuart_bus_priv.bmp);
988 vuart_bus_priv.bmp = NULL;
989
990 pr_debug(" <- %s:%d\n", __func__, __LINE__);
991 return 0;
992}
993
994static int ps3_vuart_probe(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800995{
996 int result;
Geoff Levand7626e782007-06-16 08:01:06 +1000997 struct ps3_vuart_port_driver *drv;
998 struct ps3_vuart_port_priv *priv = NULL;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800999
1000 dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
1001
Geoff Levand7626e782007-06-16 08:01:06 +10001002 drv = ps3_system_bus_dev_to_vuart_drv(dev);
1003
1004 dev_dbg(&dev->core, "%s:%d: (%s)\n", __func__, __LINE__,
1005 drv->core.core.name);
1006
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001007 BUG_ON(!drv);
1008
Geoff Levand7626e782007-06-16 08:01:06 +10001009 if (dev->port_number >= PORT_COUNT) {
1010 BUG();
1011 return -EINVAL;
1012 }
1013
Geoff Levandc4e67522008-01-19 07:32:53 +11001014 mutex_lock(&vuart_bus_priv.probe_mutex);
Geoff Levand75c86e72007-02-13 17:37:28 -08001015
Geoff Levand7626e782007-06-16 08:01:06 +10001016 result = ps3_vuart_bus_interrupt_get();
Geoff Levand75c86e72007-02-13 17:37:28 -08001017
Geoff Levand7626e782007-06-16 08:01:06 +10001018 if (result)
1019 goto fail_setup_interrupt;
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001020
Geoff Levand7626e782007-06-16 08:01:06 +10001021 if (vuart_bus_priv.devices[dev->port_number]) {
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001022 dev_dbg(&dev->core, "%s:%d: port busy (%d)\n", __func__,
Geoff Levand7626e782007-06-16 08:01:06 +10001023 __LINE__, dev->port_number);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001024 result = -EBUSY;
Geoff Levand7626e782007-06-16 08:01:06 +10001025 goto fail_busy;
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001026 }
1027
Geoff Levand7626e782007-06-16 08:01:06 +10001028 vuart_bus_priv.devices[dev->port_number] = dev;
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001029
Geoff Levand7626e782007-06-16 08:01:06 +10001030 /* Setup dev->driver_priv. */
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001031
Geoff Levand7626e782007-06-16 08:01:06 +10001032 dev->driver_priv = kzalloc(sizeof(struct ps3_vuart_port_priv),
1033 GFP_KERNEL);
Geoff Levand75c86e72007-02-13 17:37:28 -08001034
Geoff Levand7626e782007-06-16 08:01:06 +10001035 if (!dev->driver_priv) {
Geoff Levand75c86e72007-02-13 17:37:28 -08001036 result = -ENOMEM;
Geoff Levand7626e782007-06-16 08:01:06 +10001037 goto fail_dev_malloc;
Geoff Levand75c86e72007-02-13 17:37:28 -08001038 }
1039
Geoff Levand7626e782007-06-16 08:01:06 +10001040 priv = to_port_priv(dev);
Geoff Levand75c86e72007-02-13 17:37:28 -08001041
Geoff Levand7626e782007-06-16 08:01:06 +10001042 INIT_LIST_HEAD(&priv->tx_list.head);
1043 spin_lock_init(&priv->tx_list.lock);
Geoff Levand75c86e72007-02-13 17:37:28 -08001044
Geoff Levand7626e782007-06-16 08:01:06 +10001045 INIT_LIST_HEAD(&priv->rx_list.head);
1046 spin_lock_init(&priv->rx_list.lock);
Geoff Levand75c86e72007-02-13 17:37:28 -08001047
Tejun Heo4a8bb7f2014-03-07 10:24:48 -05001048 INIT_WORK(&priv->rx_list.work.work, ps3_vuart_work);
Geoff Levand7626e782007-06-16 08:01:06 +10001049 priv->rx_list.work.trigger = 0;
1050 priv->rx_list.work.dev = dev;
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001051
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001052 /* clear stale pending interrupts */
Geoff Levand75c86e72007-02-13 17:37:28 -08001053
1054 ps3_vuart_clear_rx_bytes(dev, 0);
1055
1056 ps3_vuart_set_interrupt_mask(dev, INTERRUPT_MASK_RX);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001057
1058 ps3_vuart_set_triggers(dev, 1, 1);
1059
1060 if (drv->probe)
1061 result = drv->probe(dev);
1062 else {
1063 result = 0;
1064 dev_info(&dev->core, "%s:%d: no probe method\n", __func__,
1065 __LINE__);
1066 }
1067
1068 if (result) {
1069 dev_dbg(&dev->core, "%s:%d: drv->probe failed\n",
1070 __func__, __LINE__);
1071 goto fail_probe;
1072 }
1073
Geoff Levandc4e67522008-01-19 07:32:53 +11001074 mutex_unlock(&vuart_bus_priv.probe_mutex);
Geoff Levand75c86e72007-02-13 17:37:28 -08001075
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001076 return result;
1077
1078fail_probe:
Geoff Levand75c86e72007-02-13 17:37:28 -08001079 ps3_vuart_set_interrupt_mask(dev, 0);
Geoff Levand7626e782007-06-16 08:01:06 +10001080 kfree(dev->driver_priv);
1081 dev->driver_priv = NULL;
1082fail_dev_malloc:
1083 vuart_bus_priv.devices[dev->port_number] = NULL;
1084fail_busy:
1085 ps3_vuart_bus_interrupt_put();
1086fail_setup_interrupt:
Geoff Levandc4e67522008-01-19 07:32:53 +11001087 mutex_unlock(&vuart_bus_priv.probe_mutex);
Geoff Levand7626e782007-06-16 08:01:06 +10001088 dev_dbg(&dev->core, "%s:%d: failed\n", __func__, __LINE__);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001089 return result;
1090}
1091
Geoff Levand7626e782007-06-16 08:01:06 +10001092/**
1093 * ps3_vuart_cleanup - common cleanup helper.
1094 * @dev: The struct ps3_system_bus_device instance.
1095 *
1096 * Cleans interrupts and HV resources. Must be called with
1097 * vuart_bus_priv.probe_mutex held. Used by ps3_vuart_remove and
1098 * ps3_vuart_shutdown. After this call, polled reading will still work.
1099 */
1100
1101static int ps3_vuart_cleanup(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001102{
Geoff Levand7626e782007-06-16 08:01:06 +10001103 dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
1104
1105 ps3_vuart_cancel_async(dev);
1106 ps3_vuart_set_interrupt_mask(dev, 0);
1107 ps3_vuart_bus_interrupt_put();
1108 return 0;
1109}
1110
1111/**
1112 * ps3_vuart_remove - Completely clean the device instance.
1113 * @dev: The struct ps3_system_bus_device instance.
1114 *
1115 * Cleans all memory, interrupts and HV resources. After this call the
1116 * device can no longer be used.
1117 */
1118
1119static int ps3_vuart_remove(struct ps3_system_bus_device *dev)
1120{
1121 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
1122 struct ps3_vuart_port_driver *drv;
1123
1124 BUG_ON(!dev);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001125
Geoff Levandc4e67522008-01-19 07:32:53 +11001126 mutex_lock(&vuart_bus_priv.probe_mutex);
Geoff Levand75c86e72007-02-13 17:37:28 -08001127
Geoff Levand7626e782007-06-16 08:01:06 +10001128 dev_dbg(&dev->core, " -> %s:%d: match_id %d\n", __func__, __LINE__,
1129 dev->match_id);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001130
Geoff Levand7626e782007-06-16 08:01:06 +10001131 if (!dev->core.driver) {
1132 dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__,
1133 __LINE__);
Geoff Levandc4e67522008-01-19 07:32:53 +11001134 mutex_unlock(&vuart_bus_priv.probe_mutex);
Geoff Levand7626e782007-06-16 08:01:06 +10001135 return 0;
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001136 }
Geoff Levand75c86e72007-02-13 17:37:28 -08001137
Geoff Levand7626e782007-06-16 08:01:06 +10001138 drv = ps3_system_bus_dev_to_vuart_drv(dev);
1139
1140 BUG_ON(!drv);
1141
1142 if (drv->remove) {
1143 drv->remove(dev);
1144 } else {
1145 dev_dbg(&dev->core, "%s:%d: no remove method\n", __func__,
1146 __LINE__);
1147 BUG();
1148 }
1149
1150 ps3_vuart_cleanup(dev);
1151
1152 vuart_bus_priv.devices[dev->port_number] = NULL;
1153 kfree(priv);
1154 priv = NULL;
1155
1156 dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
Geoff Levandc4e67522008-01-19 07:32:53 +11001157 mutex_unlock(&vuart_bus_priv.probe_mutex);
Geoff Levand7626e782007-06-16 08:01:06 +10001158 return 0;
1159}
1160
1161/**
1162 * ps3_vuart_shutdown - Cleans interrupts and HV resources.
1163 * @dev: The struct ps3_system_bus_device instance.
1164 *
1165 * Cleans interrupts and HV resources. After this call the
1166 * device can still be used in polling mode. This behavior required
1167 * by sys-manager to be able to complete the device power operation
1168 * sequence.
1169 */
1170
1171static int ps3_vuart_shutdown(struct ps3_system_bus_device *dev)
1172{
1173 struct ps3_vuart_port_driver *drv;
1174
1175 BUG_ON(!dev);
1176
Geoff Levandc4e67522008-01-19 07:32:53 +11001177 mutex_lock(&vuart_bus_priv.probe_mutex);
Geoff Levand7626e782007-06-16 08:01:06 +10001178
1179 dev_dbg(&dev->core, " -> %s:%d: match_id %d\n", __func__, __LINE__,
1180 dev->match_id);
1181
1182 if (!dev->core.driver) {
1183 dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__,
1184 __LINE__);
Geoff Levandc4e67522008-01-19 07:32:53 +11001185 mutex_unlock(&vuart_bus_priv.probe_mutex);
Geoff Levand7626e782007-06-16 08:01:06 +10001186 return 0;
1187 }
1188
1189 drv = ps3_system_bus_dev_to_vuart_drv(dev);
1190
1191 BUG_ON(!drv);
1192
1193 if (drv->shutdown)
1194 drv->shutdown(dev);
1195 else if (drv->remove) {
1196 dev_dbg(&dev->core, "%s:%d: no shutdown, calling remove\n",
1197 __func__, __LINE__);
1198 drv->remove(dev);
1199 } else {
1200 dev_dbg(&dev->core, "%s:%d: no shutdown method\n", __func__,
1201 __LINE__);
1202 BUG();
1203 }
1204
1205 ps3_vuart_cleanup(dev);
1206
1207 dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
Geoff Levand75c86e72007-02-13 17:37:28 -08001208
Geoff Levandc4e67522008-01-19 07:32:53 +11001209 mutex_unlock(&vuart_bus_priv.probe_mutex);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001210 return 0;
1211}
1212
Geoff Levand7626e782007-06-16 08:01:06 +10001213static int __init ps3_vuart_bus_init(void)
Geert Uytterhoeven5b8e8ee2007-02-12 00:55:15 -08001214{
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001215 pr_debug("%s:%d:\n", __func__, __LINE__);
Geoff Levand75c86e72007-02-13 17:37:28 -08001216
1217 if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
Geert Uytterhoevenef596c62007-03-10 00:05:38 +01001218 return -ENODEV;
Geoff Levand75c86e72007-02-13 17:37:28 -08001219
Geoff Levandc4e67522008-01-19 07:32:53 +11001220 mutex_init(&vuart_bus_priv.probe_mutex);
Geoff Levand75c86e72007-02-13 17:37:28 -08001221
Geoff Levand7626e782007-06-16 08:01:06 +10001222 return 0;
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001223}
1224
Geoff Levand7626e782007-06-16 08:01:06 +10001225static void __exit ps3_vuart_bus_exit(void)
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001226{
1227 pr_debug("%s:%d:\n", __func__, __LINE__);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001228}
1229
Geoff Levand75c86e72007-02-13 17:37:28 -08001230core_initcall(ps3_vuart_bus_init);
1231module_exit(ps3_vuart_bus_exit);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001232
1233/**
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001234 * ps3_vuart_port_driver_register - Add a vuart port device driver.
1235 */
1236
1237int ps3_vuart_port_driver_register(struct ps3_vuart_port_driver *drv)
1238{
1239 int result;
1240
Geoff Levand7626e782007-06-16 08:01:06 +10001241 pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.core.name);
1242
1243 BUG_ON(!drv->core.match_id);
1244 BUG_ON(!drv->core.core.name);
1245
1246 drv->core.probe = ps3_vuart_probe;
1247 drv->core.remove = ps3_vuart_remove;
1248 drv->core.shutdown = ps3_vuart_shutdown;
1249
1250 result = ps3_system_bus_driver_register(&drv->core);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001251 return result;
1252}
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001253EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_register);
1254
1255/**
1256 * ps3_vuart_port_driver_unregister - Remove a vuart port device driver.
1257 */
1258
1259void ps3_vuart_port_driver_unregister(struct ps3_vuart_port_driver *drv)
1260{
Geoff Levand7626e782007-06-16 08:01:06 +10001261 pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.core.name);
1262 ps3_system_bus_driver_unregister(&drv->core);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001263}
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001264EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_unregister);