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Commit | Line | Data |
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f5fc0f86 LC |
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 | ||
2d5e82b8 | 24 | #include <linux/irq.h> |
f5fc0f86 | 25 | #include <linux/module.h> |
f5fc0f86 LC |
26 | #include <linux/crc7.h> |
27 | #include <linux/spi/spi.h> | |
c1f9a095 | 28 | #include <linux/wl12xx.h> |
5a0e3ad6 | 29 | #include <linux/slab.h> |
f5fc0f86 LC |
30 | |
31 | #include "wl1271.h" | |
32 | #include "wl12xx_80211.h" | |
2d5e82b8 | 33 | #include "wl1271_io.h" |
f5fc0f86 | 34 | |
760d969f TP |
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 | ||
b42f91ba | 66 | static inline struct spi_device *wl_to_spi(struct wl1271 *wl) |
8197b711 TP |
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 | } | |
f5fc0f86 | 75 | |
760d969f | 76 | static void wl1271_spi_disable_interrupts(struct wl1271 *wl) |
54f7e503 TP |
77 | { |
78 | disable_irq(wl->irq); | |
79 | } | |
80 | ||
760d969f | 81 | static void wl1271_spi_enable_interrupts(struct wl1271 *wl) |
54f7e503 TP |
82 | { |
83 | enable_irq(wl->irq); | |
84 | } | |
85 | ||
760d969f | 86 | static void wl1271_spi_reset(struct wl1271 *wl) |
f5fc0f86 LC |
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 | ||
8197b711 | 107 | spi_sync(wl_to_spi(wl), &m); |
f83cce35 | 108 | kfree(cmd); |
f5fc0f86 LC |
109 | |
110 | wl1271_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN); | |
111 | } | |
112 | ||
760d969f | 113 | static void wl1271_spi_init(struct wl1271 *wl) |
f5fc0f86 LC |
114 | { |
115 | u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd; | |
116 | struct spi_transfer t; | |
117 | struct spi_message m; | |
118 | ||
119 | cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); | |
120 | if (!cmd) { | |
121 | wl1271_error("could not allocate cmd for spi init"); | |
122 | return; | |
123 | } | |
124 | ||
125 | memset(crc, 0, sizeof(crc)); | |
126 | memset(&t, 0, sizeof(t)); | |
127 | spi_message_init(&m); | |
128 | ||
129 | /* | |
130 | * Set WSPI_INIT_COMMAND | |
131 | * the data is being send from the MSB to LSB | |
132 | */ | |
133 | cmd[2] = 0xff; | |
134 | cmd[3] = 0xff; | |
135 | cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX; | |
136 | cmd[0] = 0; | |
137 | cmd[7] = 0; | |
138 | cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3; | |
139 | cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN; | |
140 | ||
141 | if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0) | |
142 | cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY; | |
143 | else | |
144 | cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY; | |
145 | ||
146 | cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS | |
147 | | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS; | |
148 | ||
149 | crc[0] = cmd[1]; | |
150 | crc[1] = cmd[0]; | |
151 | crc[2] = cmd[7]; | |
152 | crc[3] = cmd[6]; | |
153 | crc[4] = cmd[5]; | |
154 | ||
155 | cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1; | |
156 | cmd[4] |= WSPI_INIT_CMD_END; | |
157 | ||
158 | t.tx_buf = cmd; | |
159 | t.len = WSPI_INIT_CMD_LEN; | |
160 | spi_message_add_tail(&t, &m); | |
161 | ||
8197b711 | 162 | spi_sync(wl_to_spi(wl), &m); |
f5fc0f86 | 163 | wl1271_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN); |
bb123611 | 164 | kfree(cmd); |
f5fc0f86 LC |
165 | } |
166 | ||
545f1da8 JO |
167 | #define WL1271_BUSY_WORD_TIMEOUT 1000 |
168 | ||
259da430 | 169 | static int wl1271_spi_read_busy(struct wl1271 *wl) |
545f1da8 JO |
170 | { |
171 | struct spi_transfer t[1]; | |
172 | struct spi_message m; | |
173 | u32 *busy_buf; | |
174 | int num_busy_bytes = 0; | |
175 | ||
545f1da8 JO |
176 | /* |
177 | * Read further busy words from SPI until a non-busy word is | |
178 | * encountered, then read the data itself into the buffer. | |
179 | */ | |
545f1da8 JO |
180 | |
181 | num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT; | |
182 | busy_buf = wl->buffer_busyword; | |
183 | while (num_busy_bytes) { | |
184 | num_busy_bytes--; | |
185 | spi_message_init(&m); | |
186 | memset(t, 0, sizeof(t)); | |
187 | t[0].rx_buf = busy_buf; | |
188 | t[0].len = sizeof(u32); | |
259da430 | 189 | t[0].cs_change = true; |
545f1da8 | 190 | spi_message_add_tail(&t[0], &m); |
8197b711 | 191 | spi_sync(wl_to_spi(wl), &m); |
545f1da8 | 192 | |
259da430 JO |
193 | if (*busy_buf & 0x1) |
194 | return 0; | |
545f1da8 JO |
195 | } |
196 | ||
197 | /* The SPI bus is unresponsive, the read failed. */ | |
545f1da8 | 198 | wl1271_error("SPI read busy-word timeout!\n"); |
259da430 | 199 | return -ETIMEDOUT; |
545f1da8 JO |
200 | } |
201 | ||
760d969f | 202 | static void wl1271_spi_raw_read(struct wl1271 *wl, int addr, void *buf, |
259da430 | 203 | size_t len, bool fixed) |
f5fc0f86 LC |
204 | { |
205 | struct spi_transfer t[3]; | |
206 | struct spi_message m; | |
545f1da8 | 207 | u32 *busy_buf; |
f5fc0f86 LC |
208 | u32 *cmd; |
209 | ||
210 | cmd = &wl->buffer_cmd; | |
211 | busy_buf = wl->buffer_busyword; | |
212 | ||
213 | *cmd = 0; | |
214 | *cmd |= WSPI_CMD_READ; | |
215 | *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; | |
216 | *cmd |= addr & WSPI_CMD_BYTE_ADDR; | |
217 | ||
218 | if (fixed) | |
219 | *cmd |= WSPI_CMD_FIXED; | |
220 | ||
221 | spi_message_init(&m); | |
222 | memset(t, 0, sizeof(t)); | |
223 | ||
224 | t[0].tx_buf = cmd; | |
225 | t[0].len = 4; | |
259da430 | 226 | t[0].cs_change = true; |
f5fc0f86 LC |
227 | spi_message_add_tail(&t[0], &m); |
228 | ||
229 | /* Busy and non busy words read */ | |
230 | t[1].rx_buf = busy_buf; | |
231 | t[1].len = WL1271_BUSY_WORD_LEN; | |
259da430 | 232 | t[1].cs_change = true; |
f5fc0f86 LC |
233 | spi_message_add_tail(&t[1], &m); |
234 | ||
8197b711 | 235 | spi_sync(wl_to_spi(wl), &m); |
f5fc0f86 | 236 | |
259da430 JO |
237 | if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1) && |
238 | wl1271_spi_read_busy(wl)) { | |
239 | memset(buf, 0, len); | |
240 | return; | |
241 | } | |
242 | ||
243 | spi_message_init(&m); | |
244 | memset(t, 0, sizeof(t)); | |
245 | ||
246 | t[0].rx_buf = buf; | |
247 | t[0].len = len; | |
248 | t[0].cs_change = true; | |
249 | spi_message_add_tail(&t[0], &m); | |
250 | ||
251 | spi_sync(wl_to_spi(wl), &m); | |
f5fc0f86 LC |
252 | |
253 | wl1271_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd)); | |
254 | wl1271_dump(DEBUG_SPI, "spi_read buf <- ", buf, len); | |
255 | } | |
256 | ||
760d969f | 257 | static void wl1271_spi_raw_write(struct wl1271 *wl, int addr, void *buf, |
74621417 | 258 | size_t len, bool fixed) |
f5fc0f86 LC |
259 | { |
260 | struct spi_transfer t[2]; | |
261 | struct spi_message m; | |
262 | u32 *cmd; | |
263 | ||
264 | cmd = &wl->buffer_cmd; | |
265 | ||
266 | *cmd = 0; | |
267 | *cmd |= WSPI_CMD_WRITE; | |
268 | *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; | |
269 | *cmd |= addr & WSPI_CMD_BYTE_ADDR; | |
270 | ||
271 | if (fixed) | |
272 | *cmd |= WSPI_CMD_FIXED; | |
273 | ||
274 | spi_message_init(&m); | |
275 | memset(t, 0, sizeof(t)); | |
276 | ||
277 | t[0].tx_buf = cmd; | |
278 | t[0].len = sizeof(*cmd); | |
279 | spi_message_add_tail(&t[0], &m); | |
280 | ||
281 | t[1].tx_buf = buf; | |
282 | t[1].len = len; | |
283 | spi_message_add_tail(&t[1], &m); | |
284 | ||
8197b711 | 285 | spi_sync(wl_to_spi(wl), &m); |
f5fc0f86 LC |
286 | |
287 | wl1271_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd)); | |
288 | wl1271_dump(DEBUG_SPI, "spi_write buf -> ", buf, len); | |
289 | } | |
2d5e82b8 TP |
290 | |
291 | static irqreturn_t wl1271_irq(int irq, void *cookie) | |
292 | { | |
293 | struct wl1271 *wl; | |
294 | unsigned long flags; | |
295 | ||
296 | wl1271_debug(DEBUG_IRQ, "IRQ"); | |
297 | ||
298 | wl = cookie; | |
299 | ||
300 | /* complete the ELP completion */ | |
301 | spin_lock_irqsave(&wl->wl_lock, flags); | |
302 | if (wl->elp_compl) { | |
303 | complete(wl->elp_compl); | |
304 | wl->elp_compl = NULL; | |
305 | } | |
306 | ||
1e73eb62 JO |
307 | if (!test_and_set_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags)) |
308 | ieee80211_queue_work(wl->hw, &wl->irq_work); | |
309 | set_bit(WL1271_FLAG_IRQ_PENDING, &wl->flags); | |
2d5e82b8 TP |
310 | spin_unlock_irqrestore(&wl->wl_lock, flags); |
311 | ||
312 | return IRQ_HANDLED; | |
313 | } | |
314 | ||
2cc78ff7 | 315 | static int wl1271_spi_set_power(struct wl1271 *wl, bool enable) |
becd551c TP |
316 | { |
317 | if (wl->set_power) | |
318 | wl->set_power(enable); | |
2cc78ff7 OBC |
319 | |
320 | return 0; | |
becd551c TP |
321 | } |
322 | ||
8197b711 TP |
323 | static struct wl1271_if_operations spi_ops = { |
324 | .read = wl1271_spi_raw_read, | |
325 | .write = wl1271_spi_raw_write, | |
326 | .reset = wl1271_spi_reset, | |
327 | .init = wl1271_spi_init, | |
becd551c | 328 | .power = wl1271_spi_set_power, |
8197b711 TP |
329 | .dev = wl1271_spi_wl_to_dev, |
330 | .enable_irq = wl1271_spi_enable_interrupts, | |
331 | .disable_irq = wl1271_spi_disable_interrupts | |
332 | }; | |
333 | ||
2d5e82b8 TP |
334 | static int __devinit wl1271_probe(struct spi_device *spi) |
335 | { | |
336 | struct wl12xx_platform_data *pdata; | |
337 | struct ieee80211_hw *hw; | |
338 | struct wl1271 *wl; | |
339 | int ret; | |
340 | ||
341 | pdata = spi->dev.platform_data; | |
342 | if (!pdata) { | |
343 | wl1271_error("no platform data"); | |
344 | return -ENODEV; | |
345 | } | |
346 | ||
347 | hw = wl1271_alloc_hw(); | |
348 | if (IS_ERR(hw)) | |
349 | return PTR_ERR(hw); | |
350 | ||
351 | wl = hw->priv; | |
352 | ||
353 | dev_set_drvdata(&spi->dev, wl); | |
8197b711 TP |
354 | wl->if_priv = spi; |
355 | ||
356 | wl->if_ops = &spi_ops; | |
2d5e82b8 TP |
357 | |
358 | /* This is the only SPI value that we need to set here, the rest | |
359 | * comes from the board-peripherals file */ | |
360 | spi->bits_per_word = 32; | |
361 | ||
362 | ret = spi_setup(spi); | |
363 | if (ret < 0) { | |
364 | wl1271_error("spi_setup failed"); | |
365 | goto out_free; | |
366 | } | |
367 | ||
368 | wl->set_power = pdata->set_power; | |
369 | if (!wl->set_power) { | |
370 | wl1271_error("set power function missing in platform data"); | |
371 | ret = -ENODEV; | |
372 | goto out_free; | |
373 | } | |
374 | ||
15cea993 OBC |
375 | wl->ref_clock = pdata->board_ref_clock; |
376 | ||
2d5e82b8 TP |
377 | wl->irq = spi->irq; |
378 | if (wl->irq < 0) { | |
379 | wl1271_error("irq missing in platform data"); | |
380 | ret = -ENODEV; | |
381 | goto out_free; | |
382 | } | |
383 | ||
384 | ret = request_irq(wl->irq, wl1271_irq, 0, DRIVER_NAME, wl); | |
385 | if (ret < 0) { | |
386 | wl1271_error("request_irq() failed: %d", ret); | |
387 | goto out_free; | |
388 | } | |
389 | ||
390 | set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING); | |
391 | ||
392 | disable_irq(wl->irq); | |
393 | ||
2d5e82b8 TP |
394 | ret = wl1271_init_ieee80211(wl); |
395 | if (ret) | |
a1dd8187 | 396 | goto out_irq; |
2d5e82b8 TP |
397 | |
398 | ret = wl1271_register_hw(wl); | |
399 | if (ret) | |
a1dd8187 | 400 | goto out_irq; |
2d5e82b8 TP |
401 | |
402 | wl1271_notice("initialized"); | |
403 | ||
404 | return 0; | |
405 | ||
2d5e82b8 TP |
406 | out_irq: |
407 | free_irq(wl->irq, wl); | |
408 | ||
409 | out_free: | |
3b56dd6a | 410 | wl1271_free_hw(wl); |
2d5e82b8 TP |
411 | |
412 | return ret; | |
413 | } | |
414 | ||
415 | static int __devexit wl1271_remove(struct spi_device *spi) | |
416 | { | |
417 | struct wl1271 *wl = dev_get_drvdata(&spi->dev); | |
418 | ||
2d5e82b8 TP |
419 | free_irq(wl->irq, wl); |
420 | ||
3b56dd6a | 421 | wl1271_unregister_hw(wl); |
2d5e82b8 TP |
422 | wl1271_free_hw(wl); |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
427 | ||
428 | static struct spi_driver wl1271_spi_driver = { | |
429 | .driver = { | |
7fdd50d0 | 430 | .name = "wl1271_spi", |
2d5e82b8 TP |
431 | .bus = &spi_bus_type, |
432 | .owner = THIS_MODULE, | |
433 | }, | |
434 | ||
435 | .probe = wl1271_probe, | |
436 | .remove = __devexit_p(wl1271_remove), | |
437 | }; | |
438 | ||
439 | static int __init wl1271_init(void) | |
440 | { | |
441 | int ret; | |
442 | ||
443 | ret = spi_register_driver(&wl1271_spi_driver); | |
444 | if (ret < 0) { | |
445 | wl1271_error("failed to register spi driver: %d", ret); | |
446 | goto out; | |
447 | } | |
448 | ||
449 | out: | |
450 | return ret; | |
451 | } | |
452 | ||
453 | static void __exit wl1271_exit(void) | |
454 | { | |
455 | spi_unregister_driver(&wl1271_spi_driver); | |
456 | ||
457 | wl1271_notice("unloaded"); | |
458 | } | |
459 | ||
460 | module_init(wl1271_init); | |
461 | module_exit(wl1271_exit); | |
462 | ||
463 | MODULE_LICENSE("GPL"); | |
464 | MODULE_AUTHOR("Luciano Coelho <luciano.coelho@nokia.com>"); | |
465 | MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>"); | |
466 | MODULE_FIRMWARE(WL1271_FW_NAME); | |
f148cfdd | 467 | MODULE_ALIAS("spi:wl1271"); |