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22#include <linux/interrupt.h>
23#include <linux/irq.h>
24#include <linux/module.h>
25#include <linux/slab.h>
26#include <linux/crc7.h>
27#include <linux/spi/spi.h>
28#include <linux/wl12xx.h>
29
30#include "wl1251.h"
31#include "reg.h"
32#include "spi.h"
33
34static irqreturn_t wl1251_irq(int irq, void *cookie)
35{
36 struct wl1251 *wl;
37
38 wl1251_debug(DEBUG_IRQ, "IRQ");
39
40 wl = cookie;
41
42 ieee80211_queue_work(wl->hw, &wl->irq_work);
43
44 return IRQ_HANDLED;
45}
46
47static struct spi_device *wl_to_spi(struct wl1251 *wl)
48{
49 return wl->if_priv;
50}
51
52static void wl1251_spi_reset(struct wl1251 *wl)
53{
54 u8 *cmd;
55 struct spi_transfer t;
56 struct spi_message m;
57
58 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
59 if (!cmd) {
60 wl1251_error("could not allocate cmd for spi reset");
61 return;
62 }
63
64 memset(&t, 0, sizeof(t));
65 spi_message_init(&m);
66
67 memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
68
69 t.tx_buf = cmd;
70 t.len = WSPI_INIT_CMD_LEN;
71 spi_message_add_tail(&t, &m);
72
73 spi_sync(wl_to_spi(wl), &m);
74
75 wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
76
77 kfree(cmd);
78}
79
80static void wl1251_spi_wake(struct wl1251 *wl)
81{
82 u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd;
83 struct spi_transfer t;
84 struct spi_message m;
85
86 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
87 if (!cmd) {
88 wl1251_error("could not allocate cmd for spi init");
89 return;
90 }
91
92 memset(crc, 0, sizeof(crc));
93 memset(&t, 0, sizeof(t));
94 spi_message_init(&m);
95
96
97
98
99
100 cmd[2] = 0xff;
101 cmd[3] = 0xff;
102 cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
103 cmd[0] = 0;
104 cmd[7] = 0;
105 cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
106 cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
107
108 if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
109 cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;
110 else
111 cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
112
113 cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
114 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
115
116 crc[0] = cmd[1];
117 crc[1] = cmd[0];
118 crc[2] = cmd[7];
119 crc[3] = cmd[6];
120 crc[4] = cmd[5];
121
122 cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1;
123 cmd[4] |= WSPI_INIT_CMD_END;
124
125 t.tx_buf = cmd;
126 t.len = WSPI_INIT_CMD_LEN;
127 spi_message_add_tail(&t, &m);
128
129 spi_sync(wl_to_spi(wl), &m);
130
131 wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
132
133 kfree(cmd);
134}
135
136static void wl1251_spi_reset_wake(struct wl1251 *wl)
137{
138 wl1251_spi_reset(wl);
139 wl1251_spi_wake(wl);
140}
141
142static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf,
143 size_t len)
144{
145 struct spi_transfer t[3];
146 struct spi_message m;
147 u8 *busy_buf;
148 u32 *cmd;
149
150 cmd = &wl->buffer_cmd;
151 busy_buf = wl->buffer_busyword;
152
153 *cmd = 0;
154 *cmd |= WSPI_CMD_READ;
155 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
156 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
157
158 spi_message_init(&m);
159 memset(t, 0, sizeof(t));
160
161 t[0].tx_buf = cmd;
162 t[0].len = 4;
163 spi_message_add_tail(&t[0], &m);
164
165
166 t[1].rx_buf = busy_buf;
167 t[1].len = WL1251_BUSY_WORD_LEN;
168 spi_message_add_tail(&t[1], &m);
169
170 t[2].rx_buf = buf;
171 t[2].len = len;
172 spi_message_add_tail(&t[2], &m);
173
174 spi_sync(wl_to_spi(wl), &m);
175
176
177
178 wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
179 wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
180}
181
182static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf,
183 size_t len)
184{
185 struct spi_transfer t[2];
186 struct spi_message m;
187 u32 *cmd;
188
189 cmd = &wl->buffer_cmd;
190
191 *cmd = 0;
192 *cmd |= WSPI_CMD_WRITE;
193 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
194 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
195
196 spi_message_init(&m);
197 memset(t, 0, sizeof(t));
198
199 t[0].tx_buf = cmd;
200 t[0].len = sizeof(*cmd);
201 spi_message_add_tail(&t[0], &m);
202
203 t[1].tx_buf = buf;
204 t[1].len = len;
205 spi_message_add_tail(&t[1], &m);
206
207 spi_sync(wl_to_spi(wl), &m);
208
209 wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
210 wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
211}
212
213static void wl1251_spi_enable_irq(struct wl1251 *wl)
214{
215 return enable_irq(wl->irq);
216}
217
218static void wl1251_spi_disable_irq(struct wl1251 *wl)
219{
220 return disable_irq(wl->irq);
221}
222
223static int wl1251_spi_set_power(struct wl1251 *wl, bool enable)
224{
225 if (wl->set_power)
226 wl->set_power(enable);
227
228 return 0;
229}
230
231static const struct wl1251_if_operations wl1251_spi_ops = {
232 .read = wl1251_spi_read,
233 .write = wl1251_spi_write,
234 .reset = wl1251_spi_reset_wake,
235 .enable_irq = wl1251_spi_enable_irq,
236 .disable_irq = wl1251_spi_disable_irq,
237 .power = wl1251_spi_set_power,
238};
239
240static int wl1251_spi_probe(struct spi_device *spi)
241{
242 struct wl12xx_platform_data *pdata;
243 struct ieee80211_hw *hw;
244 struct wl1251 *wl;
245 int ret;
246
247 pdata = spi->dev.platform_data;
248 if (!pdata) {
249 wl1251_error("no platform data");
250 return -ENODEV;
251 }
252
253 hw = wl1251_alloc_hw();
254 if (IS_ERR(hw))
255 return PTR_ERR(hw);
256
257 wl = hw->priv;
258
259 SET_IEEE80211_DEV(hw, &spi->dev);
260 spi_set_drvdata(spi, wl);
261 wl->if_priv = spi;
262 wl->if_ops = &wl1251_spi_ops;
263
264
265
266 spi->bits_per_word = 32;
267
268 ret = spi_setup(spi);
269 if (ret < 0) {
270 wl1251_error("spi_setup failed");
271 goto out_free;
272 }
273
274 wl->set_power = pdata->set_power;
275 if (!wl->set_power) {
276 wl1251_error("set power function missing in platform data");
277 return -ENODEV;
278 }
279
280 wl->irq = spi->irq;
281 if (wl->irq < 0) {
282 wl1251_error("irq missing in platform data");
283 return -ENODEV;
284 }
285
286 wl->use_eeprom = pdata->use_eeprom;
287
288 irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
289 ret = request_irq(wl->irq, wl1251_irq, 0, DRIVER_NAME, wl);
290 if (ret < 0) {
291 wl1251_error("request_irq() failed: %d", ret);
292 goto out_free;
293 }
294
295 irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
296
297 ret = wl1251_init_ieee80211(wl);
298 if (ret)
299 goto out_irq;
300
301 return 0;
302
303 out_irq:
304 free_irq(wl->irq, wl);
305
306 out_free:
307 ieee80211_free_hw(hw);
308
309 return ret;
310}
311
312static int wl1251_spi_remove(struct spi_device *spi)
313{
314 struct wl1251 *wl = spi_get_drvdata(spi);
315
316 free_irq(wl->irq, wl);
317 wl1251_free_hw(wl);
318
319 return 0;
320}
321
322static struct spi_driver wl1251_spi_driver = {
323 .driver = {
324 .name = DRIVER_NAME,
325 .owner = THIS_MODULE,
326 },
327
328 .probe = wl1251_spi_probe,
329 .remove = wl1251_spi_remove,
330};
331
332static int __init wl1251_spi_init(void)
333{
334 int ret;
335
336 ret = spi_register_driver(&wl1251_spi_driver);
337 if (ret < 0) {
338 wl1251_error("failed to register spi driver: %d", ret);
339 goto out;
340 }
341
342out:
343 return ret;
344}
345
346static void __exit wl1251_spi_exit(void)
347{
348 spi_unregister_driver(&wl1251_spi_driver);
349
350 wl1251_notice("unloaded");
351}
352
353module_init(wl1251_spi_init);
354module_exit(wl1251_spi_exit);
355
356MODULE_LICENSE("GPL");
357MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");
358MODULE_ALIAS("spi:wl1251");
359
