blob: 90c097a7a47ab5fc7a41b298f3beb968dbadd359 [file] [log] [blame]
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>
22#include <linux/module.h>
23#include <linux/interrupt.h>
Geoff Levandea1547d2007-02-06 14:23:47 -080024#include <linux/workqueue.h>
Jiri Slaby1977f032007-10-18 23:40:25 -070025#include <linux/bitops.h>
Geoff Levand74e95d5d2006-12-08 18:27:47 -080026#include <asm/ps3.h>
27
Geoff Levand75c86e72007-02-13 17:37:28 -080028#include <asm/firmware.h>
Geoff Levand74e95d5d2006-12-08 18:27:47 -080029#include <asm/lv1call.h>
Geoff Levand74e95d5d2006-12-08 18:27:47 -080030
31#include "vuart.h"
32
33MODULE_AUTHOR("Sony Corporation");
34MODULE_LICENSE("GPL v2");
Geoff Levand75c86e72007-02-13 17:37:28 -080035MODULE_DESCRIPTION("PS3 vuart");
Geoff Levand74e95d5d2006-12-08 18:27:47 -080036
37/**
38 * vuart - An inter-partition data link service.
39 * port 0: PS3 AV Settings.
40 * port 2: PS3 System Manager.
41 *
42 * The vuart provides a bi-directional byte stream data link between logical
43 * partitions. Its primary role is as a communications link between the guest
44 * OS and the system policy module. The current HV does not support any
45 * connections other than those listed.
46 */
47
48enum {PORT_COUNT = 3,};
49
50enum vuart_param {
51 PARAM_TX_TRIGGER = 0,
52 PARAM_RX_TRIGGER = 1,
53 PARAM_INTERRUPT_MASK = 2,
54 PARAM_RX_BUF_SIZE = 3, /* read only */
55 PARAM_RX_BYTES = 4, /* read only */
56 PARAM_TX_BUF_SIZE = 5, /* read only */
57 PARAM_TX_BYTES = 6, /* read only */
58 PARAM_INTERRUPT_STATUS = 7, /* read only */
59};
60
61enum vuart_interrupt_bit {
62 INTERRUPT_BIT_TX = 0,
63 INTERRUPT_BIT_RX = 1,
64 INTERRUPT_BIT_DISCONNECT = 2,
65};
66
67enum vuart_interrupt_mask {
68 INTERRUPT_MASK_TX = 1,
69 INTERRUPT_MASK_RX = 2,
70 INTERRUPT_MASK_DISCONNECT = 4,
71};
72
73/**
Geoff Levand7626e782007-06-16 08:01:06 +100074 * struct ps3_vuart_port_priv - private vuart device data.
75 */
76
77struct ps3_vuart_port_priv {
78 u64 interrupt_mask;
79
80 struct {
81 spinlock_t lock;
82 struct list_head head;
83 } tx_list;
84 struct {
85 struct ps3_vuart_work work;
86 unsigned long bytes_held;
87 spinlock_t lock;
88 struct list_head head;
89 } rx_list;
90 struct ps3_vuart_stats stats;
91};
92
93static struct ps3_vuart_port_priv *to_port_priv(
94 struct ps3_system_bus_device *dev)
95{
96 BUG_ON(!dev);
97 BUG_ON(!dev->driver_priv);
98 return (struct ps3_vuart_port_priv *)dev->driver_priv;
99}
100
101/**
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800102 * struct ports_bmp - bitmap indicating ports needing service.
103 *
104 * A 256 bit read only bitmap indicating ports needing service. Do not write
105 * to these bits. Must not cross a page boundary.
106 */
107
108struct ports_bmp {
109 u64 status;
110 u64 unused[3];
Geert Uytterhoevend0e5c2182008-01-19 07:32:19 +1100111} __attribute__((aligned(32)));
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800112
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800113#define dump_ports_bmp(_b) _dump_ports_bmp(_b, __func__, __LINE__)
Geoff Levand848cfdc2007-06-16 07:18:14 +1000114static void __maybe_unused _dump_ports_bmp(
Geert Uytterhoevend0e5c2182008-01-19 07:32:19 +1100115 const struct ports_bmp *bmp, const char *func, int line)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800116{
117 pr_debug("%s:%d: ports_bmp: %016lxh\n", func, line, bmp->status);
118}
119
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800120#define dump_port_params(_b) _dump_port_params(_b, __func__, __LINE__)
Geoff Levand848cfdc2007-06-16 07:18:14 +1000121static void __maybe_unused _dump_port_params(unsigned int port_number,
Geert Uytterhoevend0e5c2182008-01-19 07:32:19 +1100122 const char *func, int line)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800123{
124#if defined(DEBUG)
125 static const char *strings[] = {
126 "tx_trigger ",
127 "rx_trigger ",
128 "interrupt_mask ",
129 "rx_buf_size ",
130 "rx_bytes ",
131 "tx_buf_size ",
132 "tx_bytes ",
133 "interrupt_status",
134 };
135 int result;
136 unsigned int i;
137 u64 value;
138
139 for (i = 0; i < ARRAY_SIZE(strings); i++) {
140 result = lv1_get_virtual_uart_param(port_number, i, &value);
141
142 if (result) {
143 pr_debug("%s:%d: port_%u: %s failed: %s\n", func, line,
144 port_number, strings[i], ps3_result(result));
145 continue;
146 }
147 pr_debug("%s:%d: port_%u: %s = %lxh\n",
148 func, line, port_number, strings[i], value);
149 }
150#endif
151}
152
153struct vuart_triggers {
154 unsigned long rx;
155 unsigned long tx;
156};
157
Geoff Levand7626e782007-06-16 08:01:06 +1000158int ps3_vuart_get_triggers(struct ps3_system_bus_device *dev,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800159 struct vuart_triggers *trig)
160{
161 int result;
162 unsigned long size;
163 unsigned long val;
164
Geoff Levand7626e782007-06-16 08:01:06 +1000165 result = lv1_get_virtual_uart_param(dev->port_number,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800166 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
Geoff Levand7626e782007-06-16 08:01:06 +1000174 result = lv1_get_virtual_uart_param(dev->port_number,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800175 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
Geoff Levand7626e782007-06-16 08:01:06 +1000183 result = lv1_get_virtual_uart_param(dev->port_number,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800184 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
Geoff Levand7626e782007-06-16 08:01:06 +1000200int ps3_vuart_set_triggers(struct ps3_system_bus_device *dev, unsigned int tx,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800201 unsigned int rx)
202{
203 int result;
204 unsigned long size;
205
Geoff Levand7626e782007-06-16 08:01:06 +1000206 result = lv1_set_virtual_uart_param(dev->port_number,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800207 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
Geoff Levand7626e782007-06-16 08:01:06 +1000215 result = lv1_get_virtual_uart_param(dev->port_number,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800216 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
Geoff Levand7626e782007-06-16 08:01:06 +1000224 result = lv1_set_virtual_uart_param(dev->port_number,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800225 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
Geoff Levand7626e782007-06-16 08:01:06 +1000239static int ps3_vuart_get_rx_bytes_waiting(struct ps3_system_bus_device *dev,
Geoff Levand75c86e72007-02-13 17:37:28 -0800240 u64 *bytes_waiting)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800241{
Geoff Levand7626e782007-06-16 08:01:06 +1000242 int result;
243
244 result = lv1_get_virtual_uart_param(dev->port_number,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800245 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
Geoff Levand7626e782007-06-16 08:01:06 +1000256/**
257 * ps3_vuart_set_interrupt_mask - Enable/disable the port interrupt sources.
258 * @dev: The struct ps3_system_bus_device instance.
259 * @bmp: Logical OR of enum vuart_interrupt_mask values. A zero bit disables.
260 */
261
262static int ps3_vuart_set_interrupt_mask(struct ps3_system_bus_device *dev,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800263 unsigned long mask)
264{
265 int result;
Geoff Levand7626e782007-06-16 08:01:06 +1000266 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800267
268 dev_dbg(&dev->core, "%s:%d: %lxh\n", __func__, __LINE__, mask);
269
Geoff Levand7626e782007-06-16 08:01:06 +1000270 priv->interrupt_mask = mask;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800271
Geoff Levand7626e782007-06-16 08:01:06 +1000272 result = lv1_set_virtual_uart_param(dev->port_number,
273 PARAM_INTERRUPT_MASK, priv->interrupt_mask);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800274
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
Geoff Levand7626e782007-06-16 08:01:06 +1000282static int ps3_vuart_get_interrupt_status(struct ps3_system_bus_device *dev,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800283 unsigned long *status)
284{
Geoff Levand7626e782007-06-16 08:01:06 +1000285 int result;
286 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand75c86e72007-02-13 17:37:28 -0800287 u64 tmp;
Geoff Levand7626e782007-06-16 08:01:06 +1000288
289 result = lv1_get_virtual_uart_param(dev->port_number,
Geoff Levand75c86e72007-02-13 17:37:28 -0800290 PARAM_INTERRUPT_STATUS, &tmp);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800291
292 if (result)
293 dev_dbg(&dev->core, "%s:%d: interrupt_status failed: %s\n",
294 __func__, __LINE__, ps3_result(result));
295
Geoff Levand7626e782007-06-16 08:01:06 +1000296 *status = tmp & priv->interrupt_mask;
Geoff Levand75c86e72007-02-13 17:37:28 -0800297
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800298 dev_dbg(&dev->core, "%s:%d: m %lxh, s %lxh, m&s %lxh\n",
Geoff Levand7626e782007-06-16 08:01:06 +1000299 __func__, __LINE__, priv->interrupt_mask, tmp, *status);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800300
301 return result;
302}
303
Geoff Levand7626e782007-06-16 08:01:06 +1000304int ps3_vuart_enable_interrupt_tx(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800305{
Geoff Levand7626e782007-06-16 08:01:06 +1000306 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
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800310 | INTERRUPT_MASK_TX);
311}
312
Geoff Levand7626e782007-06-16 08:01:06 +1000313int ps3_vuart_enable_interrupt_rx(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800314{
Geoff Levand7626e782007-06-16 08:01:06 +1000315 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
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800319 | INTERRUPT_MASK_RX);
320}
321
Geoff Levand7626e782007-06-16 08:01:06 +1000322int ps3_vuart_enable_interrupt_disconnect(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800323{
Geoff Levand7626e782007-06-16 08:01:06 +1000324 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
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800328 | INTERRUPT_MASK_DISCONNECT);
329}
330
Geoff Levand7626e782007-06-16 08:01:06 +1000331int ps3_vuart_disable_interrupt_tx(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800332{
Geoff Levand7626e782007-06-16 08:01:06 +1000333 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
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800337 & ~INTERRUPT_MASK_TX) : 0;
338}
339
Geoff Levand7626e782007-06-16 08:01:06 +1000340int ps3_vuart_disable_interrupt_rx(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800341{
Geoff Levand7626e782007-06-16 08:01:06 +1000342 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
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800346 & ~INTERRUPT_MASK_RX) : 0;
347}
348
Geoff Levand7626e782007-06-16 08:01:06 +1000349int ps3_vuart_disable_interrupt_disconnect(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800350{
Geoff Levand7626e782007-06-16 08:01:06 +1000351 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
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800355 & ~INTERRUPT_MASK_DISCONNECT) : 0;
356}
357
358/**
359 * ps3_vuart_raw_write - Low level write helper.
Geoff Levand7626e782007-06-16 08:01:06 +1000360 * @dev: The struct ps3_system_bus_device instance.
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800361 *
362 * Do not call ps3_vuart_raw_write directly, use ps3_vuart_write.
363 */
364
Geoff Levand7626e782007-06-16 08:01:06 +1000365static int ps3_vuart_raw_write(struct ps3_system_bus_device *dev,
Geert Uytterhoevend0e5c2182008-01-19 07:32:19 +1100366 const void *buf, unsigned int bytes, unsigned long *bytes_written)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800367{
368 int result;
Geoff Levand7626e782007-06-16 08:01:06 +1000369 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800370
Geoff Levand7626e782007-06-16 08:01:06 +1000371 result = lv1_write_virtual_uart(dev->port_number,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800372 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
Geoff Levand7626e782007-06-16 08:01:06 +1000380 priv->stats.bytes_written += *bytes_written;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800381
Geoff Levand75c86e72007-02-13 17:37:28 -0800382 dev_dbg(&dev->core, "%s:%d: wrote %lxh/%xh=>%lxh\n", __func__, __LINE__,
Geoff Levand7626e782007-06-16 08:01:06 +1000383 *bytes_written, bytes, priv->stats.bytes_written);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800384
385 return result;
386}
387
388/**
389 * ps3_vuart_raw_read - Low level read helper.
Geoff Levand7626e782007-06-16 08:01:06 +1000390 * @dev: The struct ps3_system_bus_device instance.
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800391 *
392 * Do not call ps3_vuart_raw_read directly, use ps3_vuart_read.
393 */
394
Geoff Levand7626e782007-06-16 08:01:06 +1000395static int ps3_vuart_raw_read(struct ps3_system_bus_device *dev, void *buf,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800396 unsigned int bytes, unsigned long *bytes_read)
397{
398 int result;
Geoff Levand7626e782007-06-16 08:01:06 +1000399 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800400
401 dev_dbg(&dev->core, "%s:%d: %xh\n", __func__, __LINE__, bytes);
402
Geoff Levand7626e782007-06-16 08:01:06 +1000403 result = lv1_read_virtual_uart(dev->port_number,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800404 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
Geoff Levand7626e782007-06-16 08:01:06 +1000412 priv->stats.bytes_read += *bytes_read;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800413
414 dev_dbg(&dev->core, "%s:%d: read %lxh/%xh=>%lxh\n", __func__, __LINE__,
Geoff Levand7626e782007-06-16 08:01:06 +1000415 *bytes_read, bytes, priv->stats.bytes_read);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800416
417 return result;
418}
419
420/**
Geoff Levand75c86e72007-02-13 17:37:28 -0800421 * ps3_vuart_clear_rx_bytes - Discard bytes received.
Geoff Levand7626e782007-06-16 08:01:06 +1000422 * @dev: The struct ps3_system_bus_device instance.
Geoff Levand75c86e72007-02-13 17:37:28 -0800423 * @bytes: Max byte count to discard, zero = all pending.
424 *
425 * Used to clear pending rx interrupt source. Will not block.
426 */
427
Geoff Levand7626e782007-06-16 08:01:06 +1000428void ps3_vuart_clear_rx_bytes(struct ps3_system_bus_device *dev,
Geoff Levand75c86e72007-02-13 17:37:28 -0800429 unsigned int bytes)
430{
431 int result;
Geoff Levand7626e782007-06-16 08:01:06 +1000432 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand75c86e72007-02-13 17:37:28 -0800433 u64 bytes_waiting;
Geert Uytterhoevend0e5c2182008-01-19 07:32:19 +1100434 void *tmp;
Geoff Levand75c86e72007-02-13 17:37:28 -0800435
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
Geoff Levand7626e782007-06-16 08:01:06 +1000462 priv->stats.bytes_read -= bytes_waiting;
Geoff Levand75c86e72007-02-13 17:37:28 -0800463}
Geoff Levand7626e782007-06-16 08:01:06 +1000464EXPORT_SYMBOL_GPL(ps3_vuart_clear_rx_bytes);
Geoff Levand75c86e72007-02-13 17:37:28 -0800465
466/**
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800467 * struct list_buffer - An element for a port device fifo buffer list.
468 */
469
470struct list_buffer {
471 struct list_head link;
472 const unsigned char *head;
473 const unsigned char *tail;
474 unsigned long dbg_number;
475 unsigned char data[];
476};
477
478/**
479 * ps3_vuart_write - the entry point for writing data to a port
Geoff Levand7626e782007-06-16 08:01:06 +1000480 * @dev: The struct ps3_system_bus_device instance.
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800481 *
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
Geoff Levand7626e782007-06-16 08:01:06 +1000488int ps3_vuart_write(struct ps3_system_bus_device *dev, const void *buf,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800489 unsigned int bytes)
490{
491 static unsigned long dbg_number;
492 int result;
Geoff Levand7626e782007-06-16 08:01:06 +1000493 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800494 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
Geoff Levand7626e782007-06-16 08:01:06 +1000500 spin_lock_irqsave(&priv->tx_list.lock, flags);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800501
Geoff Levand7626e782007-06-16 08:01:06 +1000502 if (list_empty(&priv->tx_list.head)) {
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800503 unsigned long bytes_written;
504
505 result = ps3_vuart_raw_write(dev, buf, bytes, &bytes_written);
506
Geoff Levand7626e782007-06-16 08:01:06 +1000507 spin_unlock_irqrestore(&priv->tx_list.lock, flags);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800508
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
Geoff Levand7626e782007-06-16 08:01:06 +1000525 spin_unlock_irqrestore(&priv->tx_list.lock, flags);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800526
527 lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_KERNEL);
528
Geert Uytterhoevend0e5c2182008-01-19 07:32:19 +1100529 if (!lb)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800530 return -ENOMEM;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800531
532 memcpy(lb->data, buf, bytes);
533 lb->head = lb->data;
534 lb->tail = lb->data + bytes;
535 lb->dbg_number = ++dbg_number;
536
Geoff Levand7626e782007-06-16 08:01:06 +1000537 spin_lock_irqsave(&priv->tx_list.lock, flags);
538 list_add_tail(&lb->link, &priv->tx_list.head);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800539 ps3_vuart_enable_interrupt_tx(dev);
Geoff Levand7626e782007-06-16 08:01:06 +1000540 spin_unlock_irqrestore(&priv->tx_list.lock, flags);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800541
542 dev_dbg(&dev->core, "%s:%d: queued buf_%lu, %xh bytes\n",
543 __func__, __LINE__, lb->dbg_number, bytes);
544
545 return 0;
546}
Geoff Levand7626e782007-06-16 08:01:06 +1000547EXPORT_SYMBOL_GPL(ps3_vuart_write);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800548
549/**
Geoff Levand7626e782007-06-16 08:01:06 +1000550 * ps3_vuart_queue_rx_bytes - Queue waiting bytes into the buffer list.
551 * @dev: The struct ps3_system_bus_device instance.
552 * @bytes_queued: Number of bytes queued to the buffer list.
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800553 *
Geoff Levand7626e782007-06-16 08:01:06 +1000554 * Must be called with priv->rx_list.lock held.
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800555 */
556
Geoff Levand7626e782007-06-16 08:01:06 +1000557static int ps3_vuart_queue_rx_bytes(struct ps3_system_bus_device *dev,
558 u64 *bytes_queued)
559{
560 static unsigned long dbg_number;
561 int result;
562 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
563 struct list_buffer *lb;
564 u64 bytes;
565
566 *bytes_queued = 0;
567
568 result = ps3_vuart_get_rx_bytes_waiting(dev, &bytes);
569 BUG_ON(result);
570
571 if (result)
572 return -EIO;
573
574 if (!bytes)
575 return 0;
576
577 /* Add some extra space for recently arrived data. */
578
579 bytes += 128;
580
581 lb = kmalloc(sizeof(struct list_buffer) + bytes, GFP_ATOMIC);
582
583 if (!lb)
584 return -ENOMEM;
585
586 ps3_vuart_raw_read(dev, lb->data, bytes, &bytes);
587
588 lb->head = lb->data;
589 lb->tail = lb->data + bytes;
590 lb->dbg_number = ++dbg_number;
591
592 list_add_tail(&lb->link, &priv->rx_list.head);
593 priv->rx_list.bytes_held += bytes;
594
595 dev_dbg(&dev->core, "%s:%d: buf_%lu: queued %lxh bytes\n",
596 __func__, __LINE__, lb->dbg_number, bytes);
597
598 *bytes_queued = bytes;
599
600 return 0;
601}
602
603/**
604 * ps3_vuart_read - The entry point for reading data from a port.
605 *
606 * Queue data waiting at the port, and if enough bytes to satisfy the request
607 * are held in the buffer list those bytes are dequeued and copied to the
608 * caller's buffer. Emptied list buffers are retiered. If the request cannot
609 * be statified by bytes held in the list buffers -EAGAIN is returned.
610 */
611
612int ps3_vuart_read(struct ps3_system_bus_device *dev, void *buf,
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800613 unsigned int bytes)
614{
Geoff Levand7626e782007-06-16 08:01:06 +1000615 int result;
616 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800617 unsigned long flags;
618 struct list_buffer *lb, *n;
619 unsigned long bytes_read;
620
621 dev_dbg(&dev->core, "%s:%d: %u(%xh) bytes\n", __func__, __LINE__,
622 bytes, bytes);
623
Geoff Levand7626e782007-06-16 08:01:06 +1000624 spin_lock_irqsave(&priv->rx_list.lock, flags);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800625
Geoff Levand7626e782007-06-16 08:01:06 +1000626 /* Queue rx bytes here for polled reads. */
627
628 while (priv->rx_list.bytes_held < bytes) {
629 u64 tmp;
630
631 result = ps3_vuart_queue_rx_bytes(dev, &tmp);
632 if (result || !tmp) {
633 dev_dbg(&dev->core, "%s:%d: starved for %lxh bytes\n",
634 __func__, __LINE__,
635 bytes - priv->rx_list.bytes_held);
636 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
637 return -EAGAIN;
638 }
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800639 }
640
Geoff Levand7626e782007-06-16 08:01:06 +1000641 list_for_each_entry_safe(lb, n, &priv->rx_list.head, link) {
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800642 bytes_read = min((unsigned int)(lb->tail - lb->head), bytes);
643
644 memcpy(buf, lb->head, bytes_read);
645 buf += bytes_read;
646 bytes -= bytes_read;
Geoff Levand7626e782007-06-16 08:01:06 +1000647 priv->rx_list.bytes_held -= bytes_read;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800648
649 if (bytes_read < lb->tail - lb->head) {
650 lb->head += bytes_read;
Geoff Levand75c86e72007-02-13 17:37:28 -0800651 dev_dbg(&dev->core, "%s:%d: buf_%lu: dequeued %lxh "
652 "bytes\n", __func__, __LINE__, lb->dbg_number,
653 bytes_read);
Geoff Levand7626e782007-06-16 08:01:06 +1000654 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800655 return 0;
656 }
657
Geoff Levand75c86e72007-02-13 17:37:28 -0800658 dev_dbg(&dev->core, "%s:%d: buf_%lu: free, dequeued %lxh "
659 "bytes\n", __func__, __LINE__, lb->dbg_number,
660 bytes_read);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800661
662 list_del(&lb->link);
663 kfree(lb);
664 }
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800665
Geoff Levand7626e782007-06-16 08:01:06 +1000666 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800667 return 0;
668}
Geoff Levand7626e782007-06-16 08:01:06 +1000669EXPORT_SYMBOL_GPL(ps3_vuart_read);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800670
Geoff Levand7626e782007-06-16 08:01:06 +1000671/**
672 * ps3_vuart_work - Asynchronous read handler.
673 */
674
675static void ps3_vuart_work(struct work_struct *work)
Geoff Levandea1547d2007-02-06 14:23:47 -0800676{
Geoff Levand7626e782007-06-16 08:01:06 +1000677 struct ps3_system_bus_device *dev =
678 ps3_vuart_work_to_system_bus_dev(work);
679 struct ps3_vuart_port_driver *drv =
680 ps3_system_bus_dev_to_vuart_drv(dev);
681
682 BUG_ON(!drv);
683 drv->work(dev);
684}
685
686int ps3_vuart_read_async(struct ps3_system_bus_device *dev, unsigned int bytes)
687{
688 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levandea1547d2007-02-06 14:23:47 -0800689 unsigned long flags;
690
Geoff Levand7626e782007-06-16 08:01:06 +1000691 if (priv->rx_list.work.trigger) {
Geoff Levandea1547d2007-02-06 14:23:47 -0800692 dev_dbg(&dev->core, "%s:%d: warning, multiple calls\n",
693 __func__, __LINE__);
694 return -EAGAIN;
695 }
696
697 BUG_ON(!bytes);
698
Geoff Levand7626e782007-06-16 08:01:06 +1000699 PREPARE_WORK(&priv->rx_list.work.work, ps3_vuart_work);
Geoff Levandea1547d2007-02-06 14:23:47 -0800700
Geoff Levand7626e782007-06-16 08:01:06 +1000701 spin_lock_irqsave(&priv->rx_list.lock, flags);
702 if (priv->rx_list.bytes_held >= bytes) {
Geoff Levandea1547d2007-02-06 14:23:47 -0800703 dev_dbg(&dev->core, "%s:%d: schedule_work %xh bytes\n",
704 __func__, __LINE__, bytes);
Geoff Levand7626e782007-06-16 08:01:06 +1000705 schedule_work(&priv->rx_list.work.work);
706 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
Geoff Levandea1547d2007-02-06 14:23:47 -0800707 return 0;
708 }
709
Geoff Levand7626e782007-06-16 08:01:06 +1000710 priv->rx_list.work.trigger = bytes;
711 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
Geoff Levandea1547d2007-02-06 14:23:47 -0800712
713 dev_dbg(&dev->core, "%s:%d: waiting for %u(%xh) bytes\n", __func__,
714 __LINE__, bytes, bytes);
715
716 return 0;
717}
Geoff Levand7626e782007-06-16 08:01:06 +1000718EXPORT_SYMBOL_GPL(ps3_vuart_read_async);
Geoff Levandea1547d2007-02-06 14:23:47 -0800719
Geoff Levand7626e782007-06-16 08:01:06 +1000720void ps3_vuart_cancel_async(struct ps3_system_bus_device *dev)
Geoff Levandea1547d2007-02-06 14:23:47 -0800721{
Geoff Levand7626e782007-06-16 08:01:06 +1000722 to_port_priv(dev)->rx_list.work.trigger = 0;
Geoff Levandea1547d2007-02-06 14:23:47 -0800723}
Geoff Levand7626e782007-06-16 08:01:06 +1000724EXPORT_SYMBOL_GPL(ps3_vuart_cancel_async);
Geoff Levandea1547d2007-02-06 14:23:47 -0800725
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800726/**
727 * ps3_vuart_handle_interrupt_tx - third stage transmit interrupt handler
728 *
729 * Services the transmit interrupt for the port. Writes as much data from the
730 * buffer list as the port will accept. Retires any emptied list buffers and
731 * adjusts the final list buffer state for a partial write.
732 */
733
Geoff Levand7626e782007-06-16 08:01:06 +1000734static int ps3_vuart_handle_interrupt_tx(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800735{
736 int result = 0;
Geoff Levand7626e782007-06-16 08:01:06 +1000737 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800738 unsigned long flags;
739 struct list_buffer *lb, *n;
740 unsigned long bytes_total = 0;
741
742 dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
743
Geoff Levand7626e782007-06-16 08:01:06 +1000744 spin_lock_irqsave(&priv->tx_list.lock, flags);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800745
Geoff Levand7626e782007-06-16 08:01:06 +1000746 list_for_each_entry_safe(lb, n, &priv->tx_list.head, link) {
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800747
748 unsigned long bytes_written;
749
750 result = ps3_vuart_raw_write(dev, lb->head, lb->tail - lb->head,
751 &bytes_written);
752
753 if (result) {
754 dev_dbg(&dev->core,
755 "%s:%d: ps3_vuart_raw_write failed\n",
756 __func__, __LINE__);
757 break;
758 }
759
760 bytes_total += bytes_written;
761
762 if (bytes_written < lb->tail - lb->head) {
763 lb->head += bytes_written;
764 dev_dbg(&dev->core,
765 "%s:%d cleared buf_%lu, %lxh bytes\n",
766 __func__, __LINE__, lb->dbg_number,
767 bytes_written);
768 goto port_full;
769 }
770
771 dev_dbg(&dev->core, "%s:%d free buf_%lu\n", __func__, __LINE__,
772 lb->dbg_number);
773
774 list_del(&lb->link);
775 kfree(lb);
776 }
777
778 ps3_vuart_disable_interrupt_tx(dev);
779port_full:
Geoff Levand7626e782007-06-16 08:01:06 +1000780 spin_unlock_irqrestore(&priv->tx_list.lock, flags);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800781 dev_dbg(&dev->core, "%s:%d wrote %lxh bytes total\n",
782 __func__, __LINE__, bytes_total);
783 return result;
784}
785
786/**
787 * ps3_vuart_handle_interrupt_rx - third stage receive interrupt handler
788 *
789 * Services the receive interrupt for the port. Creates a list buffer and
790 * copies all waiting port data to that buffer and enqueues the buffer in the
791 * buffer list. Buffer list data is dequeued via ps3_vuart_read.
792 */
793
Geoff Levand7626e782007-06-16 08:01:06 +1000794static int ps3_vuart_handle_interrupt_rx(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800795{
Geoff Levand7626e782007-06-16 08:01:06 +1000796 int result;
797 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800798 unsigned long flags;
Geoff Levand7626e782007-06-16 08:01:06 +1000799 u64 bytes;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800800
801 dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
802
Geoff Levand7626e782007-06-16 08:01:06 +1000803 spin_lock_irqsave(&priv->rx_list.lock, flags);
804 result = ps3_vuart_queue_rx_bytes(dev, &bytes);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800805
Geoff Levand7626e782007-06-16 08:01:06 +1000806 if (result) {
807 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
808 return result;
Geoff Levandea1547d2007-02-06 14:23:47 -0800809 }
Geoff Levand7626e782007-06-16 08:01:06 +1000810
811 if (priv->rx_list.work.trigger && priv->rx_list.bytes_held
812 >= priv->rx_list.work.trigger) {
813 dev_dbg(&dev->core, "%s:%d: schedule_work %lxh bytes\n",
814 __func__, __LINE__, priv->rx_list.work.trigger);
815 priv->rx_list.work.trigger = 0;
816 schedule_work(&priv->rx_list.work.work);
817 }
818
819 spin_unlock_irqrestore(&priv->rx_list.lock, flags);
820 return result;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800821}
822
823static int ps3_vuart_handle_interrupt_disconnect(
Geoff Levand7626e782007-06-16 08:01:06 +1000824 struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800825{
826 dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
827 BUG_ON("no support");
828 return -1;
829}
830
831/**
832 * ps3_vuart_handle_port_interrupt - second stage interrupt handler
833 *
834 * Services any pending interrupt types for the port. Passes control to the
835 * third stage type specific interrupt handler. Returns control to the first
836 * stage handler after one iteration.
837 */
838
Geoff Levand7626e782007-06-16 08:01:06 +1000839static int ps3_vuart_handle_port_interrupt(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800840{
841 int result;
Geoff Levand7626e782007-06-16 08:01:06 +1000842 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800843 unsigned long status;
844
Geoff Levand75c86e72007-02-13 17:37:28 -0800845 result = ps3_vuart_get_interrupt_status(dev, &status);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800846
847 if (result)
848 return result;
849
850 dev_dbg(&dev->core, "%s:%d: status: %lxh\n", __func__, __LINE__,
851 status);
852
853 if (status & INTERRUPT_MASK_DISCONNECT) {
Geoff Levand7626e782007-06-16 08:01:06 +1000854 priv->stats.disconnect_interrupts++;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800855 result = ps3_vuart_handle_interrupt_disconnect(dev);
856 if (result)
857 ps3_vuart_disable_interrupt_disconnect(dev);
858 }
859
860 if (status & INTERRUPT_MASK_TX) {
Geoff Levand7626e782007-06-16 08:01:06 +1000861 priv->stats.tx_interrupts++;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800862 result = ps3_vuart_handle_interrupt_tx(dev);
863 if (result)
864 ps3_vuart_disable_interrupt_tx(dev);
865 }
866
867 if (status & INTERRUPT_MASK_RX) {
Geoff Levand7626e782007-06-16 08:01:06 +1000868 priv->stats.rx_interrupts++;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800869 result = ps3_vuart_handle_interrupt_rx(dev);
870 if (result)
871 ps3_vuart_disable_interrupt_rx(dev);
872 }
873
874 return 0;
875}
876
Geoff Levand75c86e72007-02-13 17:37:28 -0800877struct vuart_bus_priv {
Geoff Levand7626e782007-06-16 08:01:06 +1000878 struct ports_bmp *bmp;
Geoff Levand75c86e72007-02-13 17:37:28 -0800879 unsigned int virq;
Geoff Levandc4e67522008-01-19 07:32:53 +1100880 struct mutex probe_mutex;
Geoff Levand75c86e72007-02-13 17:37:28 -0800881 int use_count;
Geoff Levand7626e782007-06-16 08:01:06 +1000882 struct ps3_system_bus_device *devices[PORT_COUNT];
Geoff Levand75c86e72007-02-13 17:37:28 -0800883} static vuart_bus_priv;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800884
885/**
886 * ps3_vuart_irq_handler - first stage interrupt handler
887 *
888 * Loops finding any interrupting port and its associated instance data.
889 * Passes control to the second stage port specific interrupt handler. Loops
890 * until all outstanding interrupts are serviced.
891 */
892
893static irqreturn_t ps3_vuart_irq_handler(int irq, void *_private)
894{
Geoff Levand7626e782007-06-16 08:01:06 +1000895 struct vuart_bus_priv *bus_priv = _private;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800896
Geoff Levand7626e782007-06-16 08:01:06 +1000897 BUG_ON(!bus_priv);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800898
899 while (1) {
900 unsigned int port;
901
Geoff Levand7626e782007-06-16 08:01:06 +1000902 dump_ports_bmp(bus_priv->bmp);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800903
Geoff Levand7626e782007-06-16 08:01:06 +1000904 port = (BITS_PER_LONG - 1) - __ilog2(bus_priv->bmp->status);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800905
906 if (port == BITS_PER_LONG)
907 break;
908
909 BUG_ON(port >= PORT_COUNT);
Geoff Levand75c86e72007-02-13 17:37:28 -0800910 BUG_ON(!bus_priv->devices[port]);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800911
Geoff Levand75c86e72007-02-13 17:37:28 -0800912 ps3_vuart_handle_port_interrupt(bus_priv->devices[port]);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800913 }
914
915 return IRQ_HANDLED;
916}
917
Geoff Levand7626e782007-06-16 08:01:06 +1000918static int ps3_vuart_bus_interrupt_get(void)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800919{
920 int result;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800921
Geoff Levand7626e782007-06-16 08:01:06 +1000922 pr_debug(" -> %s:%d\n", __func__, __LINE__);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800923
Geoff Levand7626e782007-06-16 08:01:06 +1000924 vuart_bus_priv.use_count++;
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800925
Geoff Levand7626e782007-06-16 08:01:06 +1000926 BUG_ON(vuart_bus_priv.use_count > 2);
927
Geert Uytterhoevend0e5c2182008-01-19 07:32:19 +1100928 if (vuart_bus_priv.use_count != 1)
Geoff Levand7626e782007-06-16 08:01:06 +1000929 return 0;
Geoff Levand7626e782007-06-16 08:01:06 +1000930
931 BUG_ON(vuart_bus_priv.bmp);
932
933 vuart_bus_priv.bmp = kzalloc(sizeof(struct ports_bmp), GFP_KERNEL);
934
935 if (!vuart_bus_priv.bmp) {
936 pr_debug("%s:%d: kzalloc failed.\n", __func__, __LINE__);
937 result = -ENOMEM;
938 goto fail_bmp_malloc;
939 }
940
941 result = ps3_vuart_irq_setup(PS3_BINDING_CPU_ANY, vuart_bus_priv.bmp,
942 &vuart_bus_priv.virq);
943
944 if (result) {
945 pr_debug("%s:%d: ps3_vuart_irq_setup failed (%d)\n",
946 __func__, __LINE__, result);
947 result = -EPERM;
948 goto fail_alloc_irq;
949 }
950
951 result = request_irq(vuart_bus_priv.virq, ps3_vuart_irq_handler,
952 IRQF_DISABLED, "vuart", &vuart_bus_priv);
953
954 if (result) {
955 pr_debug("%s:%d: request_irq failed (%d)\n",
956 __func__, __LINE__, result);
957 goto fail_request_irq;
958 }
959
960 pr_debug(" <- %s:%d: ok\n", __func__, __LINE__);
961 return result;
962
963fail_request_irq:
964 ps3_vuart_irq_destroy(vuart_bus_priv.virq);
965 vuart_bus_priv.virq = NO_IRQ;
966fail_alloc_irq:
967 kfree(vuart_bus_priv.bmp);
968 vuart_bus_priv.bmp = NULL;
969fail_bmp_malloc:
970 vuart_bus_priv.use_count--;
971 pr_debug(" <- %s:%d: failed\n", __func__, __LINE__);
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800972 return result;
973}
974
Geoff Levand7626e782007-06-16 08:01:06 +1000975static int ps3_vuart_bus_interrupt_put(void)
976{
977 pr_debug(" -> %s:%d\n", __func__, __LINE__);
978
979 vuart_bus_priv.use_count--;
980
981 BUG_ON(vuart_bus_priv.use_count < 0);
982
983 if (vuart_bus_priv.use_count != 0)
984 return 0;
985
986 free_irq(vuart_bus_priv.virq, &vuart_bus_priv);
987
988 ps3_vuart_irq_destroy(vuart_bus_priv.virq);
989 vuart_bus_priv.virq = NO_IRQ;
990
991 kfree(vuart_bus_priv.bmp);
992 vuart_bus_priv.bmp = NULL;
993
994 pr_debug(" <- %s:%d\n", __func__, __LINE__);
995 return 0;
996}
997
998static int ps3_vuart_probe(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -0800999{
1000 int result;
Geoff Levand7626e782007-06-16 08:01:06 +10001001 struct ps3_vuart_port_driver *drv;
1002 struct ps3_vuart_port_priv *priv = NULL;
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001003
1004 dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
1005
Geoff Levand7626e782007-06-16 08:01:06 +10001006 drv = ps3_system_bus_dev_to_vuart_drv(dev);
1007
1008 dev_dbg(&dev->core, "%s:%d: (%s)\n", __func__, __LINE__,
1009 drv->core.core.name);
1010
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001011 BUG_ON(!drv);
1012
Geoff Levand7626e782007-06-16 08:01:06 +10001013 if (dev->port_number >= PORT_COUNT) {
1014 BUG();
1015 return -EINVAL;
1016 }
1017
Geoff Levandc4e67522008-01-19 07:32:53 +11001018 mutex_lock(&vuart_bus_priv.probe_mutex);
Geoff Levand75c86e72007-02-13 17:37:28 -08001019
Geoff Levand7626e782007-06-16 08:01:06 +10001020 result = ps3_vuart_bus_interrupt_get();
Geoff Levand75c86e72007-02-13 17:37:28 -08001021
Geoff Levand7626e782007-06-16 08:01:06 +10001022 if (result)
1023 goto fail_setup_interrupt;
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001024
Geoff Levand7626e782007-06-16 08:01:06 +10001025 if (vuart_bus_priv.devices[dev->port_number]) {
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001026 dev_dbg(&dev->core, "%s:%d: port busy (%d)\n", __func__,
Geoff Levand7626e782007-06-16 08:01:06 +10001027 __LINE__, dev->port_number);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001028 result = -EBUSY;
Geoff Levand7626e782007-06-16 08:01:06 +10001029 goto fail_busy;
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001030 }
1031
Geoff Levand7626e782007-06-16 08:01:06 +10001032 vuart_bus_priv.devices[dev->port_number] = dev;
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001033
Geoff Levand7626e782007-06-16 08:01:06 +10001034 /* Setup dev->driver_priv. */
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001035
Geoff Levand7626e782007-06-16 08:01:06 +10001036 dev->driver_priv = kzalloc(sizeof(struct ps3_vuart_port_priv),
1037 GFP_KERNEL);
Geoff Levand75c86e72007-02-13 17:37:28 -08001038
Geoff Levand7626e782007-06-16 08:01:06 +10001039 if (!dev->driver_priv) {
Geoff Levand75c86e72007-02-13 17:37:28 -08001040 result = -ENOMEM;
Geoff Levand7626e782007-06-16 08:01:06 +10001041 goto fail_dev_malloc;
Geoff Levand75c86e72007-02-13 17:37:28 -08001042 }
1043
Geoff Levand7626e782007-06-16 08:01:06 +10001044 priv = to_port_priv(dev);
Geoff Levand75c86e72007-02-13 17:37:28 -08001045
Geoff Levand7626e782007-06-16 08:01:06 +10001046 INIT_LIST_HEAD(&priv->tx_list.head);
1047 spin_lock_init(&priv->tx_list.lock);
Geoff Levand75c86e72007-02-13 17:37:28 -08001048
Geoff Levand7626e782007-06-16 08:01:06 +10001049 INIT_LIST_HEAD(&priv->rx_list.head);
1050 spin_lock_init(&priv->rx_list.lock);
Geoff Levand75c86e72007-02-13 17:37:28 -08001051
Geoff Levand7626e782007-06-16 08:01:06 +10001052 INIT_WORK(&priv->rx_list.work.work, NULL);
1053 priv->rx_list.work.trigger = 0;
1054 priv->rx_list.work.dev = dev;
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001055
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001056 /* clear stale pending interrupts */
Geoff Levand75c86e72007-02-13 17:37:28 -08001057
1058 ps3_vuart_clear_rx_bytes(dev, 0);
1059
1060 ps3_vuart_set_interrupt_mask(dev, INTERRUPT_MASK_RX);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001061
1062 ps3_vuart_set_triggers(dev, 1, 1);
1063
1064 if (drv->probe)
1065 result = drv->probe(dev);
1066 else {
1067 result = 0;
1068 dev_info(&dev->core, "%s:%d: no probe method\n", __func__,
1069 __LINE__);
1070 }
1071
1072 if (result) {
1073 dev_dbg(&dev->core, "%s:%d: drv->probe failed\n",
1074 __func__, __LINE__);
1075 goto fail_probe;
1076 }
1077
Geoff Levandc4e67522008-01-19 07:32:53 +11001078 mutex_unlock(&vuart_bus_priv.probe_mutex);
Geoff Levand75c86e72007-02-13 17:37:28 -08001079
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001080 return result;
1081
1082fail_probe:
Geoff Levand75c86e72007-02-13 17:37:28 -08001083 ps3_vuart_set_interrupt_mask(dev, 0);
Geoff Levand7626e782007-06-16 08:01:06 +10001084 kfree(dev->driver_priv);
1085 dev->driver_priv = NULL;
1086fail_dev_malloc:
1087 vuart_bus_priv.devices[dev->port_number] = NULL;
1088fail_busy:
1089 ps3_vuart_bus_interrupt_put();
1090fail_setup_interrupt:
Geoff Levandc4e67522008-01-19 07:32:53 +11001091 mutex_unlock(&vuart_bus_priv.probe_mutex);
Geoff Levand7626e782007-06-16 08:01:06 +10001092 dev_dbg(&dev->core, "%s:%d: failed\n", __func__, __LINE__);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001093 return result;
1094}
1095
Geoff Levand7626e782007-06-16 08:01:06 +10001096/**
1097 * ps3_vuart_cleanup - common cleanup helper.
1098 * @dev: The struct ps3_system_bus_device instance.
1099 *
1100 * Cleans interrupts and HV resources. Must be called with
1101 * vuart_bus_priv.probe_mutex held. Used by ps3_vuart_remove and
1102 * ps3_vuart_shutdown. After this call, polled reading will still work.
1103 */
1104
1105static int ps3_vuart_cleanup(struct ps3_system_bus_device *dev)
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001106{
Geoff Levand7626e782007-06-16 08:01:06 +10001107 dev_dbg(&dev->core, "%s:%d\n", __func__, __LINE__);
1108
1109 ps3_vuart_cancel_async(dev);
1110 ps3_vuart_set_interrupt_mask(dev, 0);
1111 ps3_vuart_bus_interrupt_put();
1112 return 0;
1113}
1114
1115/**
1116 * ps3_vuart_remove - Completely clean the device instance.
1117 * @dev: The struct ps3_system_bus_device instance.
1118 *
1119 * Cleans all memory, interrupts and HV resources. After this call the
1120 * device can no longer be used.
1121 */
1122
1123static int ps3_vuart_remove(struct ps3_system_bus_device *dev)
1124{
1125 struct ps3_vuart_port_priv *priv = to_port_priv(dev);
1126 struct ps3_vuart_port_driver *drv;
1127
1128 BUG_ON(!dev);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001129
Geoff Levandc4e67522008-01-19 07:32:53 +11001130 mutex_lock(&vuart_bus_priv.probe_mutex);
Geoff Levand75c86e72007-02-13 17:37:28 -08001131
Geoff Levand7626e782007-06-16 08:01:06 +10001132 dev_dbg(&dev->core, " -> %s:%d: match_id %d\n", __func__, __LINE__,
1133 dev->match_id);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001134
Geoff Levand7626e782007-06-16 08:01:06 +10001135 if (!dev->core.driver) {
1136 dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__,
1137 __LINE__);
Geoff Levandc4e67522008-01-19 07:32:53 +11001138 mutex_unlock(&vuart_bus_priv.probe_mutex);
Geoff Levand7626e782007-06-16 08:01:06 +10001139 return 0;
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001140 }
Geoff Levand75c86e72007-02-13 17:37:28 -08001141
Geoff Levand7626e782007-06-16 08:01:06 +10001142 drv = ps3_system_bus_dev_to_vuart_drv(dev);
1143
1144 BUG_ON(!drv);
1145
1146 if (drv->remove) {
1147 drv->remove(dev);
1148 } else {
1149 dev_dbg(&dev->core, "%s:%d: no remove method\n", __func__,
1150 __LINE__);
1151 BUG();
1152 }
1153
1154 ps3_vuart_cleanup(dev);
1155
1156 vuart_bus_priv.devices[dev->port_number] = NULL;
1157 kfree(priv);
1158 priv = NULL;
1159
1160 dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
Geoff Levandc4e67522008-01-19 07:32:53 +11001161 mutex_unlock(&vuart_bus_priv.probe_mutex);
Geoff Levand7626e782007-06-16 08:01:06 +10001162 return 0;
1163}
1164
1165/**
1166 * ps3_vuart_shutdown - Cleans interrupts and HV resources.
1167 * @dev: The struct ps3_system_bus_device instance.
1168 *
1169 * Cleans interrupts and HV resources. After this call the
1170 * device can still be used in polling mode. This behavior required
1171 * by sys-manager to be able to complete the device power operation
1172 * sequence.
1173 */
1174
1175static int ps3_vuart_shutdown(struct ps3_system_bus_device *dev)
1176{
1177 struct ps3_vuart_port_driver *drv;
1178
1179 BUG_ON(!dev);
1180
Geoff Levandc4e67522008-01-19 07:32:53 +11001181 mutex_lock(&vuart_bus_priv.probe_mutex);
Geoff Levand7626e782007-06-16 08:01:06 +10001182
1183 dev_dbg(&dev->core, " -> %s:%d: match_id %d\n", __func__, __LINE__,
1184 dev->match_id);
1185
1186 if (!dev->core.driver) {
1187 dev_dbg(&dev->core, "%s:%d: no driver bound\n", __func__,
1188 __LINE__);
Geoff Levandc4e67522008-01-19 07:32:53 +11001189 mutex_unlock(&vuart_bus_priv.probe_mutex);
Geoff Levand7626e782007-06-16 08:01:06 +10001190 return 0;
1191 }
1192
1193 drv = ps3_system_bus_dev_to_vuart_drv(dev);
1194
1195 BUG_ON(!drv);
1196
1197 if (drv->shutdown)
1198 drv->shutdown(dev);
1199 else if (drv->remove) {
1200 dev_dbg(&dev->core, "%s:%d: no shutdown, calling remove\n",
1201 __func__, __LINE__);
1202 drv->remove(dev);
1203 } else {
1204 dev_dbg(&dev->core, "%s:%d: no shutdown method\n", __func__,
1205 __LINE__);
1206 BUG();
1207 }
1208
1209 ps3_vuart_cleanup(dev);
1210
1211 dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
Geoff Levand75c86e72007-02-13 17:37:28 -08001212
Geoff Levandc4e67522008-01-19 07:32:53 +11001213 mutex_unlock(&vuart_bus_priv.probe_mutex);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001214 return 0;
1215}
1216
Geoff Levand7626e782007-06-16 08:01:06 +10001217static int __init ps3_vuart_bus_init(void)
Geert Uytterhoeven5b8e8ee2007-02-12 00:55:15 -08001218{
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001219 pr_debug("%s:%d:\n", __func__, __LINE__);
Geoff Levand75c86e72007-02-13 17:37:28 -08001220
1221 if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
Geert Uytterhoevenef596c62007-03-10 00:05:38 +01001222 return -ENODEV;
Geoff Levand75c86e72007-02-13 17:37:28 -08001223
Geoff Levandc4e67522008-01-19 07:32:53 +11001224 mutex_init(&vuart_bus_priv.probe_mutex);
Geoff Levand75c86e72007-02-13 17:37:28 -08001225
Geoff Levand7626e782007-06-16 08:01:06 +10001226 return 0;
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001227}
1228
Geoff Levand7626e782007-06-16 08:01:06 +10001229static void __exit ps3_vuart_bus_exit(void)
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001230{
1231 pr_debug("%s:%d:\n", __func__, __LINE__);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001232}
1233
Geoff Levand75c86e72007-02-13 17:37:28 -08001234core_initcall(ps3_vuart_bus_init);
1235module_exit(ps3_vuart_bus_exit);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001236
1237/**
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001238 * ps3_vuart_port_driver_register - Add a vuart port device driver.
1239 */
1240
1241int ps3_vuart_port_driver_register(struct ps3_vuart_port_driver *drv)
1242{
1243 int result;
1244
Geoff Levand7626e782007-06-16 08:01:06 +10001245 pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.core.name);
1246
1247 BUG_ON(!drv->core.match_id);
1248 BUG_ON(!drv->core.core.name);
1249
1250 drv->core.probe = ps3_vuart_probe;
1251 drv->core.remove = ps3_vuart_remove;
1252 drv->core.shutdown = ps3_vuart_shutdown;
1253
1254 result = ps3_system_bus_driver_register(&drv->core);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001255 return result;
1256}
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001257EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_register);
1258
1259/**
1260 * ps3_vuart_port_driver_unregister - Remove a vuart port device driver.
1261 */
1262
1263void ps3_vuart_port_driver_unregister(struct ps3_vuart_port_driver *drv)
1264{
Geoff Levand7626e782007-06-16 08:01:06 +10001265 pr_debug("%s:%d: (%s)\n", __func__, __LINE__, drv->core.core.name);
1266 ps3_system_bus_driver_unregister(&drv->core);
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001267}
Geoff Levand74e95d5d2006-12-08 18:27:47 -08001268EXPORT_SYMBOL_GPL(ps3_vuart_port_driver_unregister);