1 /*
2 * This file is part of wl1251
3 *
4 * Copyright (C) 2008 Nokia Corporation
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
18 * 02110-1301 USA
19 *
20 */
21
22 #include <linux/interrupt.h>
23 #include <linux/irq.h>
24 #include <linux/module.h>
25 #include <linux/slab.h>
26 #include <linux/swab.h>
27 #include <linux/crc7.h>
28 #include <linux/spi/spi.h>
29 #include <linux/wl12xx.h>
30 #include <linux/gpio.h>
31 #include <linux/of.h>
32 #include <linux/of_gpio.h>
33 #include <linux/regulator/consumer.h>
34
35 #include "wl1251.h"
36 #include "reg.h"
37 #include "spi.h"
38
wl1251_irq(int irq,void * cookie)39 static irqreturn_t wl1251_irq(int irq, void *cookie)
40 {
41 struct wl1251 *wl;
42
43 wl1251_debug(DEBUG_IRQ, "IRQ");
44
45 wl = cookie;
46
47 ieee80211_queue_work(wl->hw, &wl->irq_work);
48
49 return IRQ_HANDLED;
50 }
51
wl_to_spi(struct wl1251 * wl)52 static struct spi_device *wl_to_spi(struct wl1251 *wl)
53 {
54 return wl->if_priv;
55 }
56
wl1251_spi_reset(struct wl1251 * wl)57 static void wl1251_spi_reset(struct wl1251 *wl)
58 {
59 u8 *cmd;
60 struct spi_transfer t;
61 struct spi_message m;
62
63 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
64 if (!cmd) {
65 wl1251_error("could not allocate cmd for spi reset");
66 return;
67 }
68
69 memset(&t, 0, sizeof(t));
70 spi_message_init(&m);
71
72 memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
73
74 t.tx_buf = cmd;
75 t.len = WSPI_INIT_CMD_LEN;
76 spi_message_add_tail(&t, &m);
77
78 spi_sync(wl_to_spi(wl), &m);
79
80 wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
81
82 kfree(cmd);
83 }
84
wl1251_spi_wake(struct wl1251 * wl)85 static void wl1251_spi_wake(struct wl1251 *wl)
86 {
87 struct spi_transfer t;
88 struct spi_message m;
89 u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
90
91 if (!cmd) {
92 wl1251_error("could not allocate cmd for spi init");
93 return;
94 }
95
96 memset(&t, 0, sizeof(t));
97 spi_message_init(&m);
98
99 /* Set WSPI_INIT_COMMAND
100 * the data is being send from the MSB to LSB
101 */
102 cmd[0] = 0xff;
103 cmd[1] = 0xff;
104 cmd[2] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
105 cmd[3] = 0;
106 cmd[4] = 0;
107 cmd[5] = HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
108 cmd[5] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
109
110 cmd[6] = WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
111 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
112
113 if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
114 cmd[6] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;
115 else
116 cmd[6] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
117
118 cmd[7] = crc7_be(0, cmd+2, WSPI_INIT_CMD_CRC_LEN) | WSPI_INIT_CMD_END;
119 /*
120 * The above is the logical order; it must actually be stored
121 * in the buffer byte-swapped.
122 */
123 __swab32s((u32 *)cmd);
124 __swab32s((u32 *)cmd+1);
125
126 t.tx_buf = cmd;
127 t.len = WSPI_INIT_CMD_LEN;
128 spi_message_add_tail(&t, &m);
129
130 spi_sync(wl_to_spi(wl), &m);
131
132 wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
133
134 kfree(cmd);
135 }
136
wl1251_spi_reset_wake(struct wl1251 * wl)137 static void wl1251_spi_reset_wake(struct wl1251 *wl)
138 {
139 wl1251_spi_reset(wl);
140 wl1251_spi_wake(wl);
141 }
142
wl1251_spi_read(struct wl1251 * wl,int addr,void * buf,size_t len)143 static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf,
144 size_t len)
145 {
146 struct spi_transfer t[3];
147 struct spi_message m;
148 u8 *busy_buf;
149 u32 *cmd;
150
151 cmd = &wl->buffer_cmd;
152 busy_buf = wl->buffer_busyword;
153
154 *cmd = 0;
155 *cmd |= WSPI_CMD_READ;
156 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
157 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
158
159 spi_message_init(&m);
160 memset(t, 0, sizeof(t));
161
162 t[0].tx_buf = cmd;
163 t[0].len = 4;
164 spi_message_add_tail(&t[0], &m);
165
166 /* Busy and non busy words read */
167 t[1].rx_buf = busy_buf;
168 t[1].len = WL1251_BUSY_WORD_LEN;
169 spi_message_add_tail(&t[1], &m);
170
171 t[2].rx_buf = buf;
172 t[2].len = len;
173 spi_message_add_tail(&t[2], &m);
174
175 spi_sync(wl_to_spi(wl), &m);
176
177 /* FIXME: check busy words */
178
179 wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
180 wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
181 }
182
wl1251_spi_write(struct wl1251 * wl,int addr,void * buf,size_t len)183 static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf,
184 size_t len)
185 {
186 struct spi_transfer t[2];
187 struct spi_message m;
188 u32 *cmd;
189
190 cmd = &wl->buffer_cmd;
191
192 *cmd = 0;
193 *cmd |= WSPI_CMD_WRITE;
194 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
195 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
196
197 spi_message_init(&m);
198 memset(t, 0, sizeof(t));
199
200 t[0].tx_buf = cmd;
201 t[0].len = sizeof(*cmd);
202 spi_message_add_tail(&t[0], &m);
203
204 t[1].tx_buf = buf;
205 t[1].len = len;
206 spi_message_add_tail(&t[1], &m);
207
208 spi_sync(wl_to_spi(wl), &m);
209
210 wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
211 wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
212 }
213
wl1251_spi_enable_irq(struct wl1251 * wl)214 static void wl1251_spi_enable_irq(struct wl1251 *wl)
215 {
216 return enable_irq(wl->irq);
217 }
218
wl1251_spi_disable_irq(struct wl1251 * wl)219 static void wl1251_spi_disable_irq(struct wl1251 *wl)
220 {
221 return disable_irq(wl->irq);
222 }
223
wl1251_spi_set_power(struct wl1251 * wl,bool enable)224 static int wl1251_spi_set_power(struct wl1251 *wl, bool enable)
225 {
226 if (gpio_is_valid(wl->power_gpio))
227 gpio_set_value(wl->power_gpio, enable);
228
229 return 0;
230 }
231
232 static const struct wl1251_if_operations wl1251_spi_ops = {
233 .read = wl1251_spi_read,
234 .write = wl1251_spi_write,
235 .reset = wl1251_spi_reset_wake,
236 .enable_irq = wl1251_spi_enable_irq,
237 .disable_irq = wl1251_spi_disable_irq,
238 .power = wl1251_spi_set_power,
239 };
240
wl1251_spi_probe(struct spi_device * spi)241 static int wl1251_spi_probe(struct spi_device *spi)
242 {
243 struct wl1251_platform_data *pdata = dev_get_platdata(&spi->dev);
244 struct device_node *np = spi->dev.of_node;
245 struct ieee80211_hw *hw;
246 struct wl1251 *wl;
247 int ret;
248
249 if (!np && !pdata) {
250 wl1251_error("no platform data");
251 return -ENODEV;
252 }
253
254 hw = wl1251_alloc_hw();
255 if (IS_ERR(hw))
256 return PTR_ERR(hw);
257
258 wl = hw->priv;
259
260 SET_IEEE80211_DEV(hw, &spi->dev);
261 spi_set_drvdata(spi, wl);
262 wl->if_priv = spi;
263 wl->if_ops = &wl1251_spi_ops;
264
265 /* This is the only SPI value that we need to set here, the rest
266 * comes from the board-peripherals file
267 */
268 spi->bits_per_word = 32;
269
270 ret = spi_setup(spi);
271 if (ret < 0) {
272 wl1251_error("spi_setup failed");
273 goto out_free;
274 }
275
276 if (np) {
277 wl->use_eeprom = of_property_read_bool(np, "ti,wl1251-has-eeprom");
278 wl->power_gpio = of_get_named_gpio(np, "ti,power-gpio", 0);
279 } else if (pdata) {
280 wl->power_gpio = pdata->power_gpio;
281 wl->use_eeprom = pdata->use_eeprom;
282 }
283
284 if (wl->power_gpio == -EPROBE_DEFER) {
285 ret = -EPROBE_DEFER;
286 goto out_free;
287 }
288
289 if (gpio_is_valid(wl->power_gpio)) {
290 ret = devm_gpio_request_one(&spi->dev, wl->power_gpio,
291 GPIOF_OUT_INIT_LOW, "wl1251 power");
292 if (ret) {
293 wl1251_error("Failed to request gpio: %d\n", ret);
294 goto out_free;
295 }
296 } else {
297 wl1251_error("set power gpio missing in platform data");
298 ret = -ENODEV;
299 goto out_free;
300 }
301
302 wl->irq = spi->irq;
303 if (wl->irq < 0) {
304 wl1251_error("irq missing in platform data");
305 ret = -ENODEV;
306 goto out_free;
307 }
308
309 irq_set_status_flags(wl->irq, IRQ_NOAUTOEN);
310 ret = devm_request_irq(&spi->dev, wl->irq, wl1251_irq, 0,
311 DRIVER_NAME, wl);
312 if (ret < 0) {
313 wl1251_error("request_irq() failed: %d", ret);
314 goto out_free;
315 }
316
317 irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
318
319 wl->vio = devm_regulator_get(&spi->dev, "vio");
320 if (IS_ERR(wl->vio)) {
321 ret = PTR_ERR(wl->vio);
322 wl1251_error("vio regulator missing: %d", ret);
323 goto out_free;
324 }
325
326 ret = regulator_enable(wl->vio);
327 if (ret)
328 goto out_free;
329
330 ret = wl1251_init_ieee80211(wl);
331 if (ret)
332 goto disable_regulator;
333
334 return 0;
335
336 disable_regulator:
337 regulator_disable(wl->vio);
338 out_free:
339 ieee80211_free_hw(hw);
340
341 return ret;
342 }
343
wl1251_spi_remove(struct spi_device * spi)344 static int wl1251_spi_remove(struct spi_device *spi)
345 {
346 struct wl1251 *wl = spi_get_drvdata(spi);
347
348 wl1251_free_hw(wl);
349 regulator_disable(wl->vio);
350
351 return 0;
352 }
353
354 static struct spi_driver wl1251_spi_driver = {
355 .driver = {
356 .name = DRIVER_NAME,
357 },
358
359 .probe = wl1251_spi_probe,
360 .remove = wl1251_spi_remove,
361 };
362
363 module_spi_driver(wl1251_spi_driver);
364
365 MODULE_LICENSE("GPL");
366 MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");
367 MODULE_ALIAS("spi:wl1251");
368
