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/interrupt.h>
25 #include <linux/irq.h>
26 #include <linux/module.h>
27 #include <linux/slab.h>
28 #include <linux/swab.h>
29 #include <linux/crc7.h>
30 #include <linux/spi/spi.h>
31 #include <linux/wl12xx.h>
32 #include <linux/platform_device.h>
33
34 #include "wlcore.h"
35 #include "wl12xx_80211.h"
36 #include "io.h"
37
38 #define WSPI_CMD_READ 0x40000000
39 #define WSPI_CMD_WRITE 0x00000000
40 #define WSPI_CMD_FIXED 0x20000000
41 #define WSPI_CMD_BYTE_LENGTH 0x1FFE0000
42 #define WSPI_CMD_BYTE_LENGTH_OFFSET 17
43 #define WSPI_CMD_BYTE_ADDR 0x0001FFFF
44
45 #define WSPI_INIT_CMD_CRC_LEN 5
46
47 #define WSPI_INIT_CMD_START 0x00
48 #define WSPI_INIT_CMD_TX 0x40
49 /* the extra bypass bit is sampled by the TNET as '1' */
50 #define WSPI_INIT_CMD_BYPASS_BIT 0x80
51 #define WSPI_INIT_CMD_FIXEDBUSY_LEN 0x07
52 #define WSPI_INIT_CMD_EN_FIXEDBUSY 0x80
53 #define WSPI_INIT_CMD_DIS_FIXEDBUSY 0x00
54 #define WSPI_INIT_CMD_IOD 0x40
55 #define WSPI_INIT_CMD_IP 0x20
56 #define WSPI_INIT_CMD_CS 0x10
57 #define WSPI_INIT_CMD_WS 0x08
58 #define WSPI_INIT_CMD_WSPI 0x01
59 #define WSPI_INIT_CMD_END 0x01
60
61 #define WSPI_INIT_CMD_LEN 8
62
63 #define HW_ACCESS_WSPI_FIXED_BUSY_LEN \
64 ((WL1271_BUSY_WORD_LEN - 4) / sizeof(u32))
65 #define HW_ACCESS_WSPI_INIT_CMD_MASK 0
66
67 /* HW limitation: maximum possible chunk size is 4095 bytes */
68 #define WSPI_MAX_CHUNK_SIZE 4092
69
70 /*
71 * only support SPI for 12xx - this code should be reworked when 18xx
72 * support is introduced
73 */
74 #define SPI_AGGR_BUFFER_SIZE (4 * PAGE_SIZE)
75
76 /* Maximum number of SPI write chunks */
77 #define WSPI_MAX_NUM_OF_CHUNKS \
78 ((SPI_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE) + 1)
79
80
81 struct wl12xx_spi_glue {
82 struct device *dev;
83 struct platform_device *core;
84 };
85
wl12xx_spi_reset(struct device * child)86 static void wl12xx_spi_reset(struct device *child)
87 {
88 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
89 u8 *cmd;
90 struct spi_transfer t;
91 struct spi_message m;
92
93 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
94 if (!cmd) {
95 dev_err(child->parent,
96 "could not allocate cmd for spi reset\n");
97 return;
98 }
99
100 memset(&t, 0, sizeof(t));
101 spi_message_init(&m);
102
103 memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
104
105 t.tx_buf = cmd;
106 t.len = WSPI_INIT_CMD_LEN;
107 spi_message_add_tail(&t, &m);
108
109 spi_sync(to_spi_device(glue->dev), &m);
110
111 kfree(cmd);
112 }
113
wl12xx_spi_init(struct device * child)114 static void wl12xx_spi_init(struct device *child)
115 {
116 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
117 struct spi_transfer t;
118 struct spi_message m;
119 u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
120
121 if (!cmd) {
122 dev_err(child->parent,
123 "could not allocate cmd for spi init\n");
124 return;
125 }
126
127 memset(&t, 0, sizeof(t));
128 spi_message_init(&m);
129
130 /*
131 * Set WSPI_INIT_COMMAND
132 * the data is being send from the MSB to LSB
133 */
134 cmd[0] = 0xff;
135 cmd[1] = 0xff;
136 cmd[2] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
137 cmd[3] = 0;
138 cmd[4] = 0;
139 cmd[5] = HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
140 cmd[5] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
141
142 cmd[6] = WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
143 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
144
145 if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
146 cmd[6] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;
147 else
148 cmd[6] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
149
150 cmd[7] = crc7_be(0, cmd+2, WSPI_INIT_CMD_CRC_LEN) | WSPI_INIT_CMD_END;
151 /*
152 * The above is the logical order; it must actually be stored
153 * in the buffer byte-swapped.
154 */
155 __swab32s((u32 *)cmd);
156 __swab32s((u32 *)cmd+1);
157
158 t.tx_buf = cmd;
159 t.len = WSPI_INIT_CMD_LEN;
160 spi_message_add_tail(&t, &m);
161
162 spi_sync(to_spi_device(glue->dev), &m);
163 kfree(cmd);
164 }
165
166 #define WL1271_BUSY_WORD_TIMEOUT 1000
167
wl12xx_spi_read_busy(struct device * child)168 static int wl12xx_spi_read_busy(struct device *child)
169 {
170 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
171 struct wl1271 *wl = dev_get_drvdata(child);
172 struct spi_transfer t[1];
173 struct spi_message m;
174 u32 *busy_buf;
175 int num_busy_bytes = 0;
176
177 /*
178 * Read further busy words from SPI until a non-busy word is
179 * encountered, then read the data itself into the buffer.
180 */
181
182 num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT;
183 busy_buf = wl->buffer_busyword;
184 while (num_busy_bytes) {
185 num_busy_bytes--;
186 spi_message_init(&m);
187 memset(t, 0, sizeof(t));
188 t[0].rx_buf = busy_buf;
189 t[0].len = sizeof(u32);
190 t[0].cs_change = true;
191 spi_message_add_tail(&t[0], &m);
192 spi_sync(to_spi_device(glue->dev), &m);
193
194 if (*busy_buf & 0x1)
195 return 0;
196 }
197
198 /* The SPI bus is unresponsive, the read failed. */
199 dev_err(child->parent, "SPI read busy-word timeout!\n");
200 return -ETIMEDOUT;
201 }
202
wl12xx_spi_raw_read(struct device * child,int addr,void * buf,size_t len,bool fixed)203 static int __must_check wl12xx_spi_raw_read(struct device *child, int addr,
204 void *buf, size_t len, bool fixed)
205 {
206 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
207 struct wl1271 *wl = dev_get_drvdata(child);
208 struct spi_transfer t[2];
209 struct spi_message m;
210 u32 *busy_buf;
211 u32 *cmd;
212 u32 chunk_len;
213
214 while (len > 0) {
215 chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len);
216
217 cmd = &wl->buffer_cmd;
218 busy_buf = wl->buffer_busyword;
219
220 *cmd = 0;
221 *cmd |= WSPI_CMD_READ;
222 *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) &
223 WSPI_CMD_BYTE_LENGTH;
224 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
225
226 if (fixed)
227 *cmd |= WSPI_CMD_FIXED;
228
229 spi_message_init(&m);
230 memset(t, 0, sizeof(t));
231
232 t[0].tx_buf = cmd;
233 t[0].len = 4;
234 t[0].cs_change = true;
235 spi_message_add_tail(&t[0], &m);
236
237 /* Busy and non busy words read */
238 t[1].rx_buf = busy_buf;
239 t[1].len = WL1271_BUSY_WORD_LEN;
240 t[1].cs_change = true;
241 spi_message_add_tail(&t[1], &m);
242
243 spi_sync(to_spi_device(glue->dev), &m);
244
245 if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1) &&
246 wl12xx_spi_read_busy(child)) {
247 memset(buf, 0, chunk_len);
248 return 0;
249 }
250
251 spi_message_init(&m);
252 memset(t, 0, sizeof(t));
253
254 t[0].rx_buf = buf;
255 t[0].len = chunk_len;
256 t[0].cs_change = true;
257 spi_message_add_tail(&t[0], &m);
258
259 spi_sync(to_spi_device(glue->dev), &m);
260
261 if (!fixed)
262 addr += chunk_len;
263 buf += chunk_len;
264 len -= chunk_len;
265 }
266
267 return 0;
268 }
269
wl12xx_spi_raw_write(struct device * child,int addr,void * buf,size_t len,bool fixed)270 static int __must_check wl12xx_spi_raw_write(struct device *child, int addr,
271 void *buf, size_t len, bool fixed)
272 {
273 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
274 /* SPI write buffers - 2 for each chunk */
275 struct spi_transfer t[2 * WSPI_MAX_NUM_OF_CHUNKS];
276 struct spi_message m;
277 u32 commands[WSPI_MAX_NUM_OF_CHUNKS]; /* 1 command per chunk */
278 u32 *cmd;
279 u32 chunk_len;
280 int i;
281
282 WARN_ON(len > SPI_AGGR_BUFFER_SIZE);
283
284 spi_message_init(&m);
285 memset(t, 0, sizeof(t));
286
287 cmd = &commands[0];
288 i = 0;
289 while (len > 0) {
290 chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len);
291
292 *cmd = 0;
293 *cmd |= WSPI_CMD_WRITE;
294 *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) &
295 WSPI_CMD_BYTE_LENGTH;
296 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
297
298 if (fixed)
299 *cmd |= WSPI_CMD_FIXED;
300
301 t[i].tx_buf = cmd;
302 t[i].len = sizeof(*cmd);
303 spi_message_add_tail(&t[i++], &m);
304
305 t[i].tx_buf = buf;
306 t[i].len = chunk_len;
307 spi_message_add_tail(&t[i++], &m);
308
309 if (!fixed)
310 addr += chunk_len;
311 buf += chunk_len;
312 len -= chunk_len;
313 cmd++;
314 }
315
316 spi_sync(to_spi_device(glue->dev), &m);
317
318 return 0;
319 }
320
321 static struct wl1271_if_operations spi_ops = {
322 .read = wl12xx_spi_raw_read,
323 .write = wl12xx_spi_raw_write,
324 .reset = wl12xx_spi_reset,
325 .init = wl12xx_spi_init,
326 .set_block_size = NULL,
327 };
328
wl1271_probe(struct spi_device * spi)329 static int wl1271_probe(struct spi_device *spi)
330 {
331 struct wl12xx_spi_glue *glue;
332 struct wlcore_platdev_data pdev_data;
333 struct resource res[1];
334 int ret;
335
336 memset(&pdev_data, 0x00, sizeof(pdev_data));
337
338 /* TODO: add DT parsing when needed */
339
340 pdev_data.if_ops = &spi_ops;
341
342 glue = devm_kzalloc(&spi->dev, sizeof(*glue), GFP_KERNEL);
343 if (!glue) {
344 dev_err(&spi->dev, "can't allocate glue\n");
345 return -ENOMEM;
346 }
347
348 glue->dev = &spi->dev;
349
350 spi_set_drvdata(spi, glue);
351
352 /* This is the only SPI value that we need to set here, the rest
353 * comes from the board-peripherals file */
354 spi->bits_per_word = 32;
355
356 ret = spi_setup(spi);
357 if (ret < 0) {
358 dev_err(glue->dev, "spi_setup failed\n");
359 return ret;
360 }
361
362 glue->core = platform_device_alloc("wl12xx", PLATFORM_DEVID_AUTO);
363 if (!glue->core) {
364 dev_err(glue->dev, "can't allocate platform_device\n");
365 return -ENOMEM;
366 }
367
368 glue->core->dev.parent = &spi->dev;
369
370 memset(res, 0x00, sizeof(res));
371
372 res[0].start = spi->irq;
373 res[0].flags = IORESOURCE_IRQ;
374 res[0].name = "irq";
375
376 ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res));
377 if (ret) {
378 dev_err(glue->dev, "can't add resources\n");
379 goto out_dev_put;
380 }
381
382 ret = platform_device_add_data(glue->core, &pdev_data,
383 sizeof(pdev_data));
384 if (ret) {
385 dev_err(glue->dev, "can't add platform data\n");
386 goto out_dev_put;
387 }
388
389 ret = platform_device_add(glue->core);
390 if (ret) {
391 dev_err(glue->dev, "can't register platform device\n");
392 goto out_dev_put;
393 }
394
395 return 0;
396
397 out_dev_put:
398 platform_device_put(glue->core);
399 return ret;
400 }
401
wl1271_remove(struct spi_device * spi)402 static int wl1271_remove(struct spi_device *spi)
403 {
404 struct wl12xx_spi_glue *glue = spi_get_drvdata(spi);
405
406 platform_device_unregister(glue->core);
407
408 return 0;
409 }
410
411
412 static struct spi_driver wl1271_spi_driver = {
413 .driver = {
414 .name = "wl1271_spi",
415 .owner = THIS_MODULE,
416 },
417
418 .probe = wl1271_probe,
419 .remove = wl1271_remove,
420 };
421
422 module_spi_driver(wl1271_spi_driver);
423 MODULE_LICENSE("GPL");
424 MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>");
425 MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
426 MODULE_ALIAS("spi:wl1271");
427