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24#include <linux/interrupt.h>
25#include <linux/irq.h>
26#include <linux/module.h>
27#include <linux/crc7.h>
28#include <linux/spi/spi.h>
29#include <linux/wl12xx.h>
30#include <linux/platform_device.h>
31#include <linux/slab.h>
32
33#include "wlcore.h"
34#include "wl12xx_80211.h"
35#include "io.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
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
67#define WSPI_MAX_CHUNK_SIZE 4092
68
69#define WSPI_MAX_NUM_OF_CHUNKS (WL1271_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE)
70
71struct wl12xx_spi_glue {
72 struct device *dev;
73 struct platform_device *core;
74};
75
76static void wl12xx_spi_reset(struct device *child)
77{
78 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
79 u8 *cmd;
80 struct spi_transfer t;
81 struct spi_message m;
82
83 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
84 if (!cmd) {
85 dev_err(child->parent,
86 "could not allocate cmd for spi reset\n");
87 return;
88 }
89
90 memset(&t, 0, sizeof(t));
91 spi_message_init(&m);
92
93 memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
94
95 t.tx_buf = cmd;
96 t.len = WSPI_INIT_CMD_LEN;
97 spi_message_add_tail(&t, &m);
98
99 spi_sync(to_spi_device(glue->dev), &m);
100
101 kfree(cmd);
102}
103
104static void wl12xx_spi_init(struct device *child)
105{
106 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
107 u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd;
108 struct spi_transfer t;
109 struct spi_message m;
110
111 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
112 if (!cmd) {
113 dev_err(child->parent,
114 "could not allocate cmd for spi init\n");
115 return;
116 }
117
118 memset(crc, 0, sizeof(crc));
119 memset(&t, 0, sizeof(t));
120 spi_message_init(&m);
121
122
123
124
125
126 cmd[2] = 0xff;
127 cmd[3] = 0xff;
128 cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
129 cmd[0] = 0;
130 cmd[7] = 0;
131 cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
132 cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
133
134 if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
135 cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;
136 else
137 cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
138
139 cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
140 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
141
142 crc[0] = cmd[1];
143 crc[1] = cmd[0];
144 crc[2] = cmd[7];
145 crc[3] = cmd[6];
146 crc[4] = cmd[5];
147
148 cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1;
149 cmd[4] |= WSPI_INIT_CMD_END;
150
151 t.tx_buf = cmd;
152 t.len = WSPI_INIT_CMD_LEN;
153 spi_message_add_tail(&t, &m);
154
155 spi_sync(to_spi_device(glue->dev), &m);
156 kfree(cmd);
157}
158
159#define WL1271_BUSY_WORD_TIMEOUT 1000
160
161static int wl12xx_spi_read_busy(struct device *child)
162{
163 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
164 struct wl1271 *wl = dev_get_drvdata(child);
165 struct spi_transfer t[1];
166 struct spi_message m;
167 u32 *busy_buf;
168 int num_busy_bytes = 0;
169
170
171
172
173
174
175 num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT;
176 busy_buf = wl->buffer_busyword;
177 while (num_busy_bytes) {
178 num_busy_bytes--;
179 spi_message_init(&m);
180 memset(t, 0, sizeof(t));
181 t[0].rx_buf = busy_buf;
182 t[0].len = sizeof(u32);
183 t[0].cs_change = true;
184 spi_message_add_tail(&t[0], &m);
185 spi_sync(to_spi_device(glue->dev), &m);
186
187 if (*busy_buf & 0x1)
188 return 0;
189 }
190
191
192 dev_err(child->parent, "SPI read busy-word timeout!\n");
193 return -ETIMEDOUT;
194}
195
196static int __must_check wl12xx_spi_raw_read(struct device *child, int addr,
197 void *buf, size_t len, bool fixed)
198{
199 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
200 struct wl1271 *wl = dev_get_drvdata(child);
201 struct spi_transfer t[2];
202 struct spi_message m;
203 u32 *busy_buf;
204 u32 *cmd;
205 u32 chunk_len;
206
207 while (len > 0) {
208 chunk_len = min((size_t)WSPI_MAX_CHUNK_SIZE, len);
209
210 cmd = &wl->buffer_cmd;
211 busy_buf = wl->buffer_busyword;
212
213 *cmd = 0;
214 *cmd |= WSPI_CMD_READ;
215 *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) &
216 WSPI_CMD_BYTE_LENGTH;
217 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
218
219 if (fixed)
220 *cmd |= WSPI_CMD_FIXED;
221
222 spi_message_init(&m);
223 memset(t, 0, sizeof(t));
224
225 t[0].tx_buf = cmd;
226 t[0].len = 4;
227 t[0].cs_change = true;
228 spi_message_add_tail(&t[0], &m);
229
230
231 t[1].rx_buf = busy_buf;
232 t[1].len = WL1271_BUSY_WORD_LEN;
233 t[1].cs_change = true;
234 spi_message_add_tail(&t[1], &m);
235
236 spi_sync(to_spi_device(glue->dev), &m);
237
238 if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1) &&
239 wl12xx_spi_read_busy(child)) {
240 memset(buf, 0, chunk_len);
241 return 0;
242 }
243
244 spi_message_init(&m);
245 memset(t, 0, sizeof(t));
246
247 t[0].rx_buf = buf;
248 t[0].len = chunk_len;
249 t[0].cs_change = true;
250 spi_message_add_tail(&t[0], &m);
251
252 spi_sync(to_spi_device(glue->dev), &m);
253
254 if (!fixed)
255 addr += chunk_len;
256 buf += chunk_len;
257 len -= chunk_len;
258 }
259
260 return 0;
261}
262
263static int __must_check wl12xx_spi_raw_write(struct device *child, int addr,
264 void *buf, size_t len, bool fixed)
265{
266 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
267 struct spi_transfer t[2 * WSPI_MAX_NUM_OF_CHUNKS];
268 struct spi_message m;
269 u32 commands[WSPI_MAX_NUM_OF_CHUNKS];
270 u32 *cmd;
271 u32 chunk_len;
272 int i;
273
274 WARN_ON(len > WL1271_AGGR_BUFFER_SIZE);
275
276 spi_message_init(&m);
277 memset(t, 0, sizeof(t));
278
279 cmd = &commands[0];
280 i = 0;
281 while (len > 0) {
282 chunk_len = min((size_t)WSPI_MAX_CHUNK_SIZE, len);
283
284 *cmd = 0;
285 *cmd |= WSPI_CMD_WRITE;
286 *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) &
287 WSPI_CMD_BYTE_LENGTH;
288 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
289
290 if (fixed)
291 *cmd |= WSPI_CMD_FIXED;
292
293 t[i].tx_buf = cmd;
294 t[i].len = sizeof(*cmd);
295 spi_message_add_tail(&t[i++], &m);
296
297 t[i].tx_buf = buf;
298 t[i].len = chunk_len;
299 spi_message_add_tail(&t[i++], &m);
300
301 if (!fixed)
302 addr += chunk_len;
303 buf += chunk_len;
304 len -= chunk_len;
305 cmd++;
306 }
307
308 spi_sync(to_spi_device(glue->dev), &m);
309
310 return 0;
311}
312
313static struct wl1271_if_operations spi_ops = {
314 .read = wl12xx_spi_raw_read,
315 .write = wl12xx_spi_raw_write,
316 .reset = wl12xx_spi_reset,
317 .init = wl12xx_spi_init,
318 .set_block_size = NULL,
319};
320
321static int __devinit wl1271_probe(struct spi_device *spi)
322{
323 struct wl12xx_spi_glue *glue;
324 struct wl12xx_platform_data *pdata;
325 struct resource res[1];
326 int ret = -ENOMEM;
327
328 pdata = spi->dev.platform_data;
329 if (!pdata) {
330 dev_err(&spi->dev, "no platform data\n");
331 return -ENODEV;
332 }
333
334 pdata->ops = &spi_ops;
335
336 glue = kzalloc(sizeof(*glue), GFP_KERNEL);
337 if (!glue) {
338 dev_err(&spi->dev, "can't allocate glue\n");
339 goto out;
340 }
341
342 glue->dev = &spi->dev;
343
344 spi_set_drvdata(spi, glue);
345
346
347
348 spi->bits_per_word = 32;
349
350 ret = spi_setup(spi);
351 if (ret < 0) {
352 dev_err(glue->dev, "spi_setup failed\n");
353 goto out_free_glue;
354 }
355
356 glue->core = platform_device_alloc("wl12xx", -1);
357 if (!glue->core) {
358 dev_err(glue->dev, "can't allocate platform_device\n");
359 ret = -ENOMEM;
360 goto out_free_glue;
361 }
362
363 glue->core->dev.parent = &spi->dev;
364
365 memset(res, 0x00, sizeof(res));
366
367 res[0].start = spi->irq;
368 res[0].flags = IORESOURCE_IRQ;
369 res[0].name = "irq";
370
371 ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res));
372 if (ret) {
373 dev_err(glue->dev, "can't add resources\n");
374 goto out_dev_put;
375 }
376
377 ret = platform_device_add_data(glue->core, pdata, sizeof(*pdata));
378 if (ret) {
379 dev_err(glue->dev, "can't add platform data\n");
380 goto out_dev_put;
381 }
382
383 ret = platform_device_add(glue->core);
384 if (ret) {
385 dev_err(glue->dev, "can't register platform device\n");
386 goto out_dev_put;
387 }
388
389 return 0;
390
391out_dev_put:
392 platform_device_put(glue->core);
393
394out_free_glue:
395 kfree(glue);
396out:
397 return ret;
398}
399
400static int __devexit wl1271_remove(struct spi_device *spi)
401{
402 struct wl12xx_spi_glue *glue = spi_get_drvdata(spi);
403
404 platform_device_del(glue->core);
405 platform_device_put(glue->core);
406 kfree(glue);
407
408 return 0;
409}
410
411
412static struct spi_driver wl1271_spi_driver = {
413 .driver = {
414 .name = "wl1271_spi",
415 .owner = THIS_MODULE,
416 },
417
418 .probe = wl1271_probe,
419 .remove = __devexit_p(wl1271_remove),
420};
421
422static int __init wl1271_init(void)
423{
424 return spi_register_driver(&wl1271_spi_driver);
425}
426
427static void __exit wl1271_exit(void)
428{
429 spi_unregister_driver(&wl1271_spi_driver);
430}
431
432module_init(wl1271_init);
433module_exit(wl1271_exit);
434
435MODULE_LICENSE("GPL");
436MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>");
437MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
438MODULE_ALIAS("spi:wl1271");
439
