Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[linux-2.6.git] / drivers / net / wireless / wl12xx / wl1251_spi.c
1 /*
2  * This file is part of wl1251
3  *
4  * Copyright (C) 2008 Nokia Corporation
5  *
6  * Contact: Kalle Valo <kalle.valo@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/irq.h>
25 #include <linux/module.h>
26 #include <linux/slab.h>
27 #include <linux/crc7.h>
28 #include <linux/spi/spi.h>
29 #include <linux/spi/wl12xx.h>
30
31 #include "wl1251.h"
32 #include "wl1251_reg.h"
33 #include "wl1251_spi.h"
34
35 static irqreturn_t wl1251_irq(int irq, void *cookie)
36 {
37         struct wl1251 *wl;
38
39         wl1251_debug(DEBUG_IRQ, "IRQ");
40
41         wl = cookie;
42
43         ieee80211_queue_work(wl->hw, &wl->irq_work);
44
45         return IRQ_HANDLED;
46 }
47
48 static struct spi_device *wl_to_spi(struct wl1251 *wl)
49 {
50         return wl->if_priv;
51 }
52
53 static void wl1251_spi_reset(struct wl1251 *wl)
54 {
55         u8 *cmd;
56         struct spi_transfer t;
57         struct spi_message m;
58
59         cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
60         if (!cmd) {
61                 wl1251_error("could not allocate cmd for spi reset");
62                 return;
63         }
64
65         memset(&t, 0, sizeof(t));
66         spi_message_init(&m);
67
68         memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
69
70         t.tx_buf = cmd;
71         t.len = WSPI_INIT_CMD_LEN;
72         spi_message_add_tail(&t, &m);
73
74         spi_sync(wl_to_spi(wl), &m);
75
76         wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
77 }
78
79 static void wl1251_spi_wake(struct wl1251 *wl)
80 {
81         u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd;
82         struct spi_transfer t;
83         struct spi_message m;
84
85         cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
86         if (!cmd) {
87                 wl1251_error("could not allocate cmd for spi init");
88                 return;
89         }
90
91         memset(crc, 0, sizeof(crc));
92         memset(&t, 0, sizeof(t));
93         spi_message_init(&m);
94
95         /*
96          * Set WSPI_INIT_COMMAND
97          * the data is being send from the MSB to LSB
98          */
99         cmd[2] = 0xff;
100         cmd[3] = 0xff;
101         cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
102         cmd[0] = 0;
103         cmd[7] = 0;
104         cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
105         cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
106
107         if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
108                 cmd[5] |=  WSPI_INIT_CMD_DIS_FIXEDBUSY;
109         else
110                 cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
111
112         cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
113                 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
114
115         crc[0] = cmd[1];
116         crc[1] = cmd[0];
117         crc[2] = cmd[7];
118         crc[3] = cmd[6];
119         crc[4] = cmd[5];
120
121         cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1;
122         cmd[4] |= WSPI_INIT_CMD_END;
123
124         t.tx_buf = cmd;
125         t.len = WSPI_INIT_CMD_LEN;
126         spi_message_add_tail(&t, &m);
127
128         spi_sync(wl_to_spi(wl), &m);
129
130         wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
131 }
132
133 static void wl1251_spi_reset_wake(struct wl1251 *wl)
134 {
135         wl1251_spi_reset(wl);
136         wl1251_spi_wake(wl);
137 }
138
139 static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf,
140                             size_t len)
141 {
142         struct spi_transfer t[3];
143         struct spi_message m;
144         u8 *busy_buf;
145         u32 *cmd;
146
147         cmd = &wl->buffer_cmd;
148         busy_buf = wl->buffer_busyword;
149
150         *cmd = 0;
151         *cmd |= WSPI_CMD_READ;
152         *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
153         *cmd |= addr & WSPI_CMD_BYTE_ADDR;
154
155         spi_message_init(&m);
156         memset(t, 0, sizeof(t));
157
158         t[0].tx_buf = cmd;
159         t[0].len = 4;
160         spi_message_add_tail(&t[0], &m);
161
162         /* Busy and non busy words read */
163         t[1].rx_buf = busy_buf;
164         t[1].len = WL1251_BUSY_WORD_LEN;
165         spi_message_add_tail(&t[1], &m);
166
167         t[2].rx_buf = buf;
168         t[2].len = len;
169         spi_message_add_tail(&t[2], &m);
170
171         spi_sync(wl_to_spi(wl), &m);
172
173         /* FIXME: check busy words */
174
175         wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
176         wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
177 }
178
179 static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf,
180                              size_t len)
181 {
182         struct spi_transfer t[2];
183         struct spi_message m;
184         u32 *cmd;
185
186         cmd = &wl->buffer_cmd;
187
188         *cmd = 0;
189         *cmd |= WSPI_CMD_WRITE;
190         *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
191         *cmd |= addr & WSPI_CMD_BYTE_ADDR;
192
193         spi_message_init(&m);
194         memset(t, 0, sizeof(t));
195
196         t[0].tx_buf = cmd;
197         t[0].len = sizeof(*cmd);
198         spi_message_add_tail(&t[0], &m);
199
200         t[1].tx_buf = buf;
201         t[1].len = len;
202         spi_message_add_tail(&t[1], &m);
203
204         spi_sync(wl_to_spi(wl), &m);
205
206         wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
207         wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
208 }
209
210 static void wl1251_spi_enable_irq(struct wl1251 *wl)
211 {
212         return enable_irq(wl->irq);
213 }
214
215 static void wl1251_spi_disable_irq(struct wl1251 *wl)
216 {
217         return disable_irq(wl->irq);
218 }
219
220 static const struct wl1251_if_operations wl1251_spi_ops = {
221         .read = wl1251_spi_read,
222         .write = wl1251_spi_write,
223         .reset = wl1251_spi_reset_wake,
224         .enable_irq = wl1251_spi_enable_irq,
225         .disable_irq = wl1251_spi_disable_irq,
226 };
227
228 static int __devinit wl1251_spi_probe(struct spi_device *spi)
229 {
230         struct wl12xx_platform_data *pdata;
231         struct ieee80211_hw *hw;
232         struct wl1251 *wl;
233         int ret;
234
235         pdata = spi->dev.platform_data;
236         if (!pdata) {
237                 wl1251_error("no platform data");
238                 return -ENODEV;
239         }
240
241         hw = wl1251_alloc_hw();
242         if (IS_ERR(hw))
243                 return PTR_ERR(hw);
244
245         wl = hw->priv;
246
247         SET_IEEE80211_DEV(hw, &spi->dev);
248         dev_set_drvdata(&spi->dev, wl);
249         wl->if_priv = spi;
250         wl->if_ops = &wl1251_spi_ops;
251
252         /* This is the only SPI value that we need to set here, the rest
253          * comes from the board-peripherals file */
254         spi->bits_per_word = 32;
255
256         ret = spi_setup(spi);
257         if (ret < 0) {
258                 wl1251_error("spi_setup failed");
259                 goto out_free;
260         }
261
262         wl->set_power = pdata->set_power;
263         if (!wl->set_power) {
264                 wl1251_error("set power function missing in platform data");
265                 return -ENODEV;
266         }
267
268         wl->irq = spi->irq;
269         if (wl->irq < 0) {
270                 wl1251_error("irq missing in platform data");
271                 return -ENODEV;
272         }
273
274         wl->use_eeprom = pdata->use_eeprom;
275
276         ret = request_irq(wl->irq, wl1251_irq, 0, DRIVER_NAME, wl);
277         if (ret < 0) {
278                 wl1251_error("request_irq() failed: %d", ret);
279                 goto out_free;
280         }
281
282         set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
283
284         disable_irq(wl->irq);
285
286         ret = wl1251_init_ieee80211(wl);
287         if (ret)
288                 goto out_irq;
289
290         return 0;
291
292  out_irq:
293         free_irq(wl->irq, wl);
294
295  out_free:
296         ieee80211_free_hw(hw);
297
298         return ret;
299 }
300
301 static int __devexit wl1251_spi_remove(struct spi_device *spi)
302 {
303         struct wl1251 *wl = dev_get_drvdata(&spi->dev);
304
305         free_irq(wl->irq, wl);
306         wl1251_free_hw(wl);
307
308         return 0;
309 }
310
311 static struct spi_driver wl1251_spi_driver = {
312         .driver = {
313                 .name           = DRIVER_NAME,
314                 .bus            = &spi_bus_type,
315                 .owner          = THIS_MODULE,
316         },
317
318         .probe          = wl1251_spi_probe,
319         .remove         = __devexit_p(wl1251_spi_remove),
320 };
321
322 static int __init wl1251_spi_init(void)
323 {
324         int ret;
325
326         ret = spi_register_driver(&wl1251_spi_driver);
327         if (ret < 0) {
328                 wl1251_error("failed to register spi driver: %d", ret);
329                 goto out;
330         }
331
332 out:
333         return ret;
334 }
335
336 static void __exit wl1251_spi_exit(void)
337 {
338         spi_unregister_driver(&wl1251_spi_driver);
339
340         wl1251_notice("unloaded");
341 }
342
343 module_init(wl1251_spi_init);
344 module_exit(wl1251_spi_exit);
345
346 MODULE_LICENSE("GPL");
347 MODULE_AUTHOR("Kalle Valo <kalle.valo@nokia.com>");