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wl1271: Cleaned up wlan power on/off functions
[deliverable/linux.git] / drivers / net / wireless / wl12xx / wl1271_spi.c
1 /*
2 * This file is part of wl1271
3 *
4 * Copyright (C) 2008-2009 Nokia Corporation
5 *
6 * Contact: Luciano Coelho <luciano.coelho@nokia.com>
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * version 2 as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 *
22 */
23
24 #include <linux/irq.h>
25 #include <linux/module.h>
26 #include <linux/platform_device.h>
27 #include <linux/crc7.h>
28 #include <linux/spi/spi.h>
29 #include <linux/spi/wl12xx.h>
30
31 #include "wl1271.h"
32 #include "wl12xx_80211.h"
33 #include "wl1271_io.h"
34
35 #include "wl1271_reg.h"
36
37 #define WSPI_CMD_READ 0x40000000
38 #define WSPI_CMD_WRITE 0x00000000
39 #define WSPI_CMD_FIXED 0x20000000
40 #define WSPI_CMD_BYTE_LENGTH 0x1FFE0000
41 #define WSPI_CMD_BYTE_LENGTH_OFFSET 17
42 #define WSPI_CMD_BYTE_ADDR 0x0001FFFF
43
44 #define WSPI_INIT_CMD_CRC_LEN 5
45
46 #define WSPI_INIT_CMD_START 0x00
47 #define WSPI_INIT_CMD_TX 0x40
48 /* the extra bypass bit is sampled by the TNET as '1' */
49 #define WSPI_INIT_CMD_BYPASS_BIT 0x80
50 #define WSPI_INIT_CMD_FIXEDBUSY_LEN 0x07
51 #define WSPI_INIT_CMD_EN_FIXEDBUSY 0x80
52 #define WSPI_INIT_CMD_DIS_FIXEDBUSY 0x00
53 #define WSPI_INIT_CMD_IOD 0x40
54 #define WSPI_INIT_CMD_IP 0x20
55 #define WSPI_INIT_CMD_CS 0x10
56 #define WSPI_INIT_CMD_WS 0x08
57 #define WSPI_INIT_CMD_WSPI 0x01
58 #define WSPI_INIT_CMD_END 0x01
59
60 #define WSPI_INIT_CMD_LEN 8
61
62 #define HW_ACCESS_WSPI_FIXED_BUSY_LEN \
63 ((WL1271_BUSY_WORD_LEN - 4) / sizeof(u32))
64 #define HW_ACCESS_WSPI_INIT_CMD_MASK 0
65
66 static inline struct spi_device *wl_to_spi(struct wl1271 *wl)
67 {
68 return wl->if_priv;
69 }
70
71 static struct device *wl1271_spi_wl_to_dev(struct wl1271 *wl)
72 {
73 return &(wl_to_spi(wl)->dev);
74 }
75
76 static void wl1271_spi_disable_interrupts(struct wl1271 *wl)
77 {
78 disable_irq(wl->irq);
79 }
80
81 static void wl1271_spi_enable_interrupts(struct wl1271 *wl)
82 {
83 enable_irq(wl->irq);
84 }
85
86 static void wl1271_spi_reset(struct wl1271 *wl)
87 {
88 u8 *cmd;
89 struct spi_transfer t;
90 struct spi_message m;
91
92 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
93 if (!cmd) {
94 wl1271_error("could not allocate cmd for spi reset");
95 return;
96 }
97
98 memset(&t, 0, sizeof(t));
99 spi_message_init(&m);
100
101 memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
102
103 t.tx_buf = cmd;
104 t.len = WSPI_INIT_CMD_LEN;
105 spi_message_add_tail(&t, &m);
106
107 spi_sync(wl_to_spi(wl), &m);
108
109 wl1271_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
110 }
111
112 static void wl1271_spi_init(struct wl1271 *wl)
113 {
114 u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd;
115 struct spi_transfer t;
116 struct spi_message m;
117
118 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
119 if (!cmd) {
120 wl1271_error("could not allocate cmd for spi init");
121 return;
122 }
123
124 memset(crc, 0, sizeof(crc));
125 memset(&t, 0, sizeof(t));
126 spi_message_init(&m);
127
128 /*
129 * Set WSPI_INIT_COMMAND
130 * the data is being send from the MSB to LSB
131 */
132 cmd[2] = 0xff;
133 cmd[3] = 0xff;
134 cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
135 cmd[0] = 0;
136 cmd[7] = 0;
137 cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
138 cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
139
140 if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
141 cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;
142 else
143 cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
144
145 cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
146 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
147
148 crc[0] = cmd[1];
149 crc[1] = cmd[0];
150 crc[2] = cmd[7];
151 crc[3] = cmd[6];
152 crc[4] = cmd[5];
153
154 cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1;
155 cmd[4] |= WSPI_INIT_CMD_END;
156
157 t.tx_buf = cmd;
158 t.len = WSPI_INIT_CMD_LEN;
159 spi_message_add_tail(&t, &m);
160
161 spi_sync(wl_to_spi(wl), &m);
162
163 wl1271_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
164 }
165
166 #define WL1271_BUSY_WORD_TIMEOUT 1000
167
168 /* FIXME: Check busy words, removed due to SPI bug */
169 #if 0
170 static void wl1271_spi_read_busy(struct wl1271 *wl, void *buf, size_t len)
171 {
172 struct spi_transfer t[1];
173 struct spi_message m;
174 u32 *busy_buf;
175 int num_busy_bytes = 0;
176
177 wl1271_info("spi read BUSY!");
178
179 /*
180 * Look for the non-busy word in the read buffer, and if found,
181 * read in the remaining data into the buffer.
182 */
183 busy_buf = (u32 *)buf;
184 for (; (u32)busy_buf < (u32)buf + len; busy_buf++) {
185 num_busy_bytes += sizeof(u32);
186 if (*busy_buf & 0x1) {
187 spi_message_init(&m);
188 memset(t, 0, sizeof(t));
189 memmove(buf, busy_buf, len - num_busy_bytes);
190 t[0].rx_buf = buf + (len - num_busy_bytes);
191 t[0].len = num_busy_bytes;
192 spi_message_add_tail(&t[0], &m);
193 spi_sync(wl_to_spi(wl), &m);
194 return;
195 }
196 }
197
198 /*
199 * Read further busy words from SPI until a non-busy word is
200 * encountered, then read the data itself into the buffer.
201 */
202 wl1271_info("spi read BUSY-polling needed!");
203
204 num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT;
205 busy_buf = wl->buffer_busyword;
206 while (num_busy_bytes) {
207 num_busy_bytes--;
208 spi_message_init(&m);
209 memset(t, 0, sizeof(t));
210 t[0].rx_buf = busy_buf;
211 t[0].len = sizeof(u32);
212 spi_message_add_tail(&t[0], &m);
213 spi_sync(wl_to_spi(wl), &m);
214
215 if (*busy_buf & 0x1) {
216 spi_message_init(&m);
217 memset(t, 0, sizeof(t));
218 t[0].rx_buf = buf;
219 t[0].len = len;
220 spi_message_add_tail(&t[0], &m);
221 spi_sync(wl_to_spi(wl), &m);
222 return;
223 }
224 }
225
226 /* The SPI bus is unresponsive, the read failed. */
227 memset(buf, 0, len);
228 wl1271_error("SPI read busy-word timeout!\n");
229 }
230 #endif
231
232 static void wl1271_spi_raw_read(struct wl1271 *wl, int addr, void *buf,
233 size_t len, bool fixed)
234 {
235 struct spi_transfer t[3];
236 struct spi_message m;
237 u32 *busy_buf;
238 u32 *cmd;
239
240 cmd = &wl->buffer_cmd;
241 busy_buf = wl->buffer_busyword;
242
243 *cmd = 0;
244 *cmd |= WSPI_CMD_READ;
245 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
246 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
247
248 if (fixed)
249 *cmd |= WSPI_CMD_FIXED;
250
251 spi_message_init(&m);
252 memset(t, 0, sizeof(t));
253
254 t[0].tx_buf = cmd;
255 t[0].len = 4;
256 spi_message_add_tail(&t[0], &m);
257
258 /* Busy and non busy words read */
259 t[1].rx_buf = busy_buf;
260 t[1].len = WL1271_BUSY_WORD_LEN;
261 spi_message_add_tail(&t[1], &m);
262
263 t[2].rx_buf = buf;
264 t[2].len = len;
265 spi_message_add_tail(&t[2], &m);
266
267 spi_sync(wl_to_spi(wl), &m);
268
269 /* FIXME: Check busy words, removed due to SPI bug */
270 /* if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1))
271 wl1271_spi_read_busy(wl, buf, len); */
272
273 wl1271_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
274 wl1271_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
275 }
276
277 static void wl1271_spi_raw_write(struct wl1271 *wl, int addr, void *buf,
278 size_t len, bool fixed)
279 {
280 struct spi_transfer t[2];
281 struct spi_message m;
282 u32 *cmd;
283
284 cmd = &wl->buffer_cmd;
285
286 *cmd = 0;
287 *cmd |= WSPI_CMD_WRITE;
288 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
289 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
290
291 if (fixed)
292 *cmd |= WSPI_CMD_FIXED;
293
294 spi_message_init(&m);
295 memset(t, 0, sizeof(t));
296
297 t[0].tx_buf = cmd;
298 t[0].len = sizeof(*cmd);
299 spi_message_add_tail(&t[0], &m);
300
301 t[1].tx_buf = buf;
302 t[1].len = len;
303 spi_message_add_tail(&t[1], &m);
304
305 spi_sync(wl_to_spi(wl), &m);
306
307 wl1271_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
308 wl1271_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
309 }
310
311 static irqreturn_t wl1271_irq(int irq, void *cookie)
312 {
313 struct wl1271 *wl;
314 unsigned long flags;
315
316 wl1271_debug(DEBUG_IRQ, "IRQ");
317
318 wl = cookie;
319
320 /* complete the ELP completion */
321 spin_lock_irqsave(&wl->wl_lock, flags);
322 if (wl->elp_compl) {
323 complete(wl->elp_compl);
324 wl->elp_compl = NULL;
325 }
326
327 if (!test_and_set_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags))
328 ieee80211_queue_work(wl->hw, &wl->irq_work);
329 set_bit(WL1271_FLAG_IRQ_PENDING, &wl->flags);
330 spin_unlock_irqrestore(&wl->wl_lock, flags);
331
332 return IRQ_HANDLED;
333 }
334
335 static void wl1271_device_release(struct device *dev)
336 {
337
338 }
339
340 static struct platform_device wl1271_device = {
341 .name = "wl1271",
342 .id = -1,
343
344 /* device model insists to have a release function */
345 .dev = {
346 .release = wl1271_device_release,
347 },
348 };
349
350 static void wl1271_spi_set_power(struct wl1271 *wl, bool enable)
351 {
352 if (wl->set_power)
353 wl->set_power(enable);
354 }
355
356 static struct wl1271_if_operations spi_ops = {
357 .read = wl1271_spi_raw_read,
358 .write = wl1271_spi_raw_write,
359 .reset = wl1271_spi_reset,
360 .init = wl1271_spi_init,
361 .power = wl1271_spi_set_power,
362 .dev = wl1271_spi_wl_to_dev,
363 .enable_irq = wl1271_spi_enable_interrupts,
364 .disable_irq = wl1271_spi_disable_interrupts
365 };
366
367 static int __devinit wl1271_probe(struct spi_device *spi)
368 {
369 struct wl12xx_platform_data *pdata;
370 struct ieee80211_hw *hw;
371 struct wl1271 *wl;
372 int ret;
373
374 pdata = spi->dev.platform_data;
375 if (!pdata) {
376 wl1271_error("no platform data");
377 return -ENODEV;
378 }
379
380 hw = wl1271_alloc_hw();
381 if (IS_ERR(hw))
382 return PTR_ERR(hw);
383
384 wl = hw->priv;
385
386 dev_set_drvdata(&spi->dev, wl);
387 wl->if_priv = spi;
388
389 wl->if_ops = &spi_ops;
390
391 /* This is the only SPI value that we need to set here, the rest
392 * comes from the board-peripherals file */
393 spi->bits_per_word = 32;
394
395 ret = spi_setup(spi);
396 if (ret < 0) {
397 wl1271_error("spi_setup failed");
398 goto out_free;
399 }
400
401 wl->set_power = pdata->set_power;
402 if (!wl->set_power) {
403 wl1271_error("set power function missing in platform data");
404 ret = -ENODEV;
405 goto out_free;
406 }
407
408 wl->irq = spi->irq;
409 if (wl->irq < 0) {
410 wl1271_error("irq missing in platform data");
411 ret = -ENODEV;
412 goto out_free;
413 }
414
415 ret = request_irq(wl->irq, wl1271_irq, 0, DRIVER_NAME, wl);
416 if (ret < 0) {
417 wl1271_error("request_irq() failed: %d", ret);
418 goto out_free;
419 }
420
421 set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
422
423 disable_irq(wl->irq);
424
425 ret = platform_device_register(&wl1271_device);
426 if (ret) {
427 wl1271_error("couldn't register platform device");
428 goto out_irq;
429 }
430 dev_set_drvdata(&wl1271_device.dev, wl);
431
432 ret = wl1271_init_ieee80211(wl);
433 if (ret)
434 goto out_platform;
435
436 ret = wl1271_register_hw(wl);
437 if (ret)
438 goto out_platform;
439
440 wl1271_notice("initialized");
441
442 return 0;
443
444 out_platform:
445 platform_device_unregister(&wl1271_device);
446
447 out_irq:
448 free_irq(wl->irq, wl);
449
450 out_free:
451 ieee80211_free_hw(hw);
452
453 return ret;
454 }
455
456 static int __devexit wl1271_remove(struct spi_device *spi)
457 {
458 struct wl1271 *wl = dev_get_drvdata(&spi->dev);
459
460 platform_device_unregister(&wl1271_device);
461 free_irq(wl->irq, wl);
462
463 wl1271_free_hw(wl);
464
465 return 0;
466 }
467
468
469 static struct spi_driver wl1271_spi_driver = {
470 .driver = {
471 .name = "wl1271",
472 .bus = &spi_bus_type,
473 .owner = THIS_MODULE,
474 },
475
476 .probe = wl1271_probe,
477 .remove = __devexit_p(wl1271_remove),
478 };
479
480 static int __init wl1271_init(void)
481 {
482 int ret;
483
484 ret = spi_register_driver(&wl1271_spi_driver);
485 if (ret < 0) {
486 wl1271_error("failed to register spi driver: %d", ret);
487 goto out;
488 }
489
490 out:
491 return ret;
492 }
493
494 static void __exit wl1271_exit(void)
495 {
496 spi_unregister_driver(&wl1271_spi_driver);
497
498 wl1271_notice("unloaded");
499 }
500
501 module_init(wl1271_init);
502 module_exit(wl1271_exit);
503
504 MODULE_LICENSE("GPL");
505 MODULE_AUTHOR("Luciano Coelho <luciano.coelho@nokia.com>");
506 MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
507 MODULE_FIRMWARE(WL1271_FW_NAME);
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