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Commit | Line | Data |
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2f01a1f5 | 1 | /* |
80301cdc | 2 | * This file is part of wl1251 |
2f01a1f5 KV |
3 | * |
4 | * Copyright (C) 2008 Nokia Corporation | |
5 | * | |
2f01a1f5 KV |
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 | ||
8e639c06 | 22 | #include <linux/irq.h> |
2f01a1f5 | 23 | #include <linux/module.h> |
5a0e3ad6 | 24 | #include <linux/slab.h> |
2f01a1f5 KV |
25 | #include <linux/crc7.h> |
26 | #include <linux/spi/spi.h> | |
c1f9a095 | 27 | #include <linux/wl12xx.h> |
2f01a1f5 | 28 | |
13674118 | 29 | #include "wl1251.h" |
29d904c4 | 30 | #include "wl1251_reg.h" |
ef2f8d45 | 31 | #include "wl1251_spi.h" |
2f01a1f5 | 32 | |
b5ed9c1b BC |
33 | static irqreturn_t wl1251_irq(int irq, void *cookie) |
34 | { | |
35 | struct wl1251 *wl; | |
36 | ||
37 | wl1251_debug(DEBUG_IRQ, "IRQ"); | |
38 | ||
39 | wl = cookie; | |
40 | ||
16e711f9 | 41 | ieee80211_queue_work(wl->hw, &wl->irq_work); |
b5ed9c1b BC |
42 | |
43 | return IRQ_HANDLED; | |
44 | } | |
45 | ||
af8c78eb BC |
46 | static struct spi_device *wl_to_spi(struct wl1251 *wl) |
47 | { | |
48 | return wl->if_priv; | |
49 | } | |
50 | ||
08d9f572 | 51 | static void wl1251_spi_reset(struct wl1251 *wl) |
2f01a1f5 KV |
52 | { |
53 | u8 *cmd; | |
54 | struct spi_transfer t; | |
55 | struct spi_message m; | |
56 | ||
57 | cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); | |
58 | if (!cmd) { | |
80301cdc | 59 | wl1251_error("could not allocate cmd for spi reset"); |
2f01a1f5 KV |
60 | return; |
61 | } | |
62 | ||
63 | memset(&t, 0, sizeof(t)); | |
64 | spi_message_init(&m); | |
65 | ||
66 | memset(cmd, 0xff, WSPI_INIT_CMD_LEN); | |
67 | ||
68 | t.tx_buf = cmd; | |
69 | t.len = WSPI_INIT_CMD_LEN; | |
70 | spi_message_add_tail(&t, &m); | |
71 | ||
af8c78eb | 72 | spi_sync(wl_to_spi(wl), &m); |
2f01a1f5 | 73 | |
80301cdc | 74 | wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN); |
2f01a1f5 KV |
75 | } |
76 | ||
8e639c06 | 77 | static void wl1251_spi_wake(struct wl1251 *wl) |
2f01a1f5 KV |
78 | { |
79 | u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd; | |
80 | struct spi_transfer t; | |
81 | struct spi_message m; | |
82 | ||
83 | cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); | |
84 | if (!cmd) { | |
80301cdc | 85 | wl1251_error("could not allocate cmd for spi init"); |
2f01a1f5 KV |
86 | return; |
87 | } | |
88 | ||
89 | memset(crc, 0, sizeof(crc)); | |
90 | memset(&t, 0, sizeof(t)); | |
91 | spi_message_init(&m); | |
92 | ||
93 | /* | |
94 | * Set WSPI_INIT_COMMAND | |
95 | * the data is being send from the MSB to LSB | |
96 | */ | |
97 | cmd[2] = 0xff; | |
98 | cmd[3] = 0xff; | |
99 | cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX; | |
100 | cmd[0] = 0; | |
101 | cmd[7] = 0; | |
102 | cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3; | |
103 | cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN; | |
104 | ||
105 | if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0) | |
106 | cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY; | |
107 | else | |
108 | cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY; | |
109 | ||
110 | cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS | |
111 | | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS; | |
112 | ||
113 | crc[0] = cmd[1]; | |
114 | crc[1] = cmd[0]; | |
115 | crc[2] = cmd[7]; | |
116 | crc[3] = cmd[6]; | |
117 | crc[4] = cmd[5]; | |
118 | ||
119 | cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1; | |
120 | cmd[4] |= WSPI_INIT_CMD_END; | |
121 | ||
122 | t.tx_buf = cmd; | |
123 | t.len = WSPI_INIT_CMD_LEN; | |
124 | spi_message_add_tail(&t, &m); | |
125 | ||
af8c78eb | 126 | spi_sync(wl_to_spi(wl), &m); |
2f01a1f5 | 127 | |
80301cdc | 128 | wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN); |
2f01a1f5 KV |
129 | } |
130 | ||
08d9f572 BC |
131 | static void wl1251_spi_reset_wake(struct wl1251 *wl) |
132 | { | |
133 | wl1251_spi_reset(wl); | |
8e639c06 | 134 | wl1251_spi_wake(wl); |
08d9f572 BC |
135 | } |
136 | ||
08d9f572 BC |
137 | static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf, |
138 | size_t len) | |
2f01a1f5 KV |
139 | { |
140 | struct spi_transfer t[3]; | |
141 | struct spi_message m; | |
5262c12d | 142 | u8 *busy_buf; |
56343a3c | 143 | u32 *cmd; |
2f01a1f5 | 144 | |
56343a3c | 145 | cmd = &wl->buffer_cmd; |
5262c12d | 146 | busy_buf = wl->buffer_busyword; |
56343a3c KV |
147 | |
148 | *cmd = 0; | |
149 | *cmd |= WSPI_CMD_READ; | |
150 | *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; | |
151 | *cmd |= addr & WSPI_CMD_BYTE_ADDR; | |
2f01a1f5 KV |
152 | |
153 | spi_message_init(&m); | |
154 | memset(t, 0, sizeof(t)); | |
155 | ||
56343a3c | 156 | t[0].tx_buf = cmd; |
2f01a1f5 KV |
157 | t[0].len = 4; |
158 | spi_message_add_tail(&t[0], &m); | |
159 | ||
160 | /* Busy and non busy words read */ | |
161 | t[1].rx_buf = busy_buf; | |
80301cdc | 162 | t[1].len = WL1251_BUSY_WORD_LEN; |
2f01a1f5 KV |
163 | spi_message_add_tail(&t[1], &m); |
164 | ||
165 | t[2].rx_buf = buf; | |
166 | t[2].len = len; | |
167 | spi_message_add_tail(&t[2], &m); | |
168 | ||
af8c78eb | 169 | spi_sync(wl_to_spi(wl), &m); |
2f01a1f5 KV |
170 | |
171 | /* FIXME: check busy words */ | |
172 | ||
80301cdc KV |
173 | wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd)); |
174 | wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len); | |
2f01a1f5 KV |
175 | } |
176 | ||
08d9f572 BC |
177 | static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf, |
178 | size_t len) | |
2f01a1f5 KV |
179 | { |
180 | struct spi_transfer t[2]; | |
181 | struct spi_message m; | |
56343a3c | 182 | u32 *cmd; |
2f01a1f5 | 183 | |
56343a3c KV |
184 | cmd = &wl->buffer_cmd; |
185 | ||
186 | *cmd = 0; | |
187 | *cmd |= WSPI_CMD_WRITE; | |
188 | *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; | |
189 | *cmd |= addr & WSPI_CMD_BYTE_ADDR; | |
2f01a1f5 KV |
190 | |
191 | spi_message_init(&m); | |
192 | memset(t, 0, sizeof(t)); | |
193 | ||
56343a3c KV |
194 | t[0].tx_buf = cmd; |
195 | t[0].len = sizeof(*cmd); | |
2f01a1f5 KV |
196 | spi_message_add_tail(&t[0], &m); |
197 | ||
198 | t[1].tx_buf = buf; | |
199 | t[1].len = len; | |
200 | spi_message_add_tail(&t[1], &m); | |
201 | ||
af8c78eb | 202 | spi_sync(wl_to_spi(wl), &m); |
2f01a1f5 | 203 | |
80301cdc KV |
204 | wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd)); |
205 | wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len); | |
2f01a1f5 | 206 | } |
08d9f572 | 207 | |
b5ed9c1b BC |
208 | static void wl1251_spi_enable_irq(struct wl1251 *wl) |
209 | { | |
210 | return enable_irq(wl->irq); | |
211 | } | |
212 | ||
213 | static void wl1251_spi_disable_irq(struct wl1251 *wl) | |
214 | { | |
215 | return disable_irq(wl->irq); | |
216 | } | |
217 | ||
af8c78eb | 218 | static const struct wl1251_if_operations wl1251_spi_ops = { |
08d9f572 BC |
219 | .read = wl1251_spi_read, |
220 | .write = wl1251_spi_write, | |
221 | .reset = wl1251_spi_reset_wake, | |
b5ed9c1b BC |
222 | .enable_irq = wl1251_spi_enable_irq, |
223 | .disable_irq = wl1251_spi_disable_irq, | |
08d9f572 | 224 | }; |
8e639c06 BC |
225 | |
226 | static int __devinit wl1251_spi_probe(struct spi_device *spi) | |
227 | { | |
228 | struct wl12xx_platform_data *pdata; | |
229 | struct ieee80211_hw *hw; | |
230 | struct wl1251 *wl; | |
231 | int ret; | |
232 | ||
233 | pdata = spi->dev.platform_data; | |
234 | if (!pdata) { | |
235 | wl1251_error("no platform data"); | |
236 | return -ENODEV; | |
237 | } | |
238 | ||
239 | hw = wl1251_alloc_hw(); | |
240 | if (IS_ERR(hw)) | |
241 | return PTR_ERR(hw); | |
242 | ||
243 | wl = hw->priv; | |
244 | ||
245 | SET_IEEE80211_DEV(hw, &spi->dev); | |
246 | dev_set_drvdata(&spi->dev, wl); | |
af8c78eb | 247 | wl->if_priv = spi; |
8e639c06 BC |
248 | wl->if_ops = &wl1251_spi_ops; |
249 | ||
250 | /* This is the only SPI value that we need to set here, the rest | |
251 | * comes from the board-peripherals file */ | |
252 | spi->bits_per_word = 32; | |
253 | ||
254 | ret = spi_setup(spi); | |
255 | if (ret < 0) { | |
256 | wl1251_error("spi_setup failed"); | |
257 | goto out_free; | |
258 | } | |
259 | ||
260 | wl->set_power = pdata->set_power; | |
261 | if (!wl->set_power) { | |
262 | wl1251_error("set power function missing in platform data"); | |
263 | return -ENODEV; | |
264 | } | |
265 | ||
266 | wl->irq = spi->irq; | |
267 | if (wl->irq < 0) { | |
268 | wl1251_error("irq missing in platform data"); | |
269 | return -ENODEV; | |
270 | } | |
271 | ||
c95cf3d0 DJW |
272 | wl->use_eeprom = pdata->use_eeprom; |
273 | ||
8e639c06 BC |
274 | ret = request_irq(wl->irq, wl1251_irq, 0, DRIVER_NAME, wl); |
275 | if (ret < 0) { | |
276 | wl1251_error("request_irq() failed: %d", ret); | |
277 | goto out_free; | |
278 | } | |
279 | ||
280 | set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING); | |
281 | ||
282 | disable_irq(wl->irq); | |
283 | ||
284 | ret = wl1251_init_ieee80211(wl); | |
285 | if (ret) | |
286 | goto out_irq; | |
287 | ||
288 | return 0; | |
289 | ||
290 | out_irq: | |
291 | free_irq(wl->irq, wl); | |
292 | ||
293 | out_free: | |
294 | ieee80211_free_hw(hw); | |
295 | ||
296 | return ret; | |
297 | } | |
298 | ||
299 | static int __devexit wl1251_spi_remove(struct spi_device *spi) | |
300 | { | |
301 | struct wl1251 *wl = dev_get_drvdata(&spi->dev); | |
302 | ||
b5ed9c1b | 303 | free_irq(wl->irq, wl); |
8e639c06 BC |
304 | wl1251_free_hw(wl); |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
309 | static struct spi_driver wl1251_spi_driver = { | |
310 | .driver = { | |
7590a550 | 311 | .name = DRIVER_NAME, |
8e639c06 BC |
312 | .bus = &spi_bus_type, |
313 | .owner = THIS_MODULE, | |
314 | }, | |
315 | ||
316 | .probe = wl1251_spi_probe, | |
317 | .remove = __devexit_p(wl1251_spi_remove), | |
318 | }; | |
319 | ||
320 | static int __init wl1251_spi_init(void) | |
321 | { | |
322 | int ret; | |
323 | ||
324 | ret = spi_register_driver(&wl1251_spi_driver); | |
325 | if (ret < 0) { | |
326 | wl1251_error("failed to register spi driver: %d", ret); | |
327 | goto out; | |
328 | } | |
329 | ||
330 | out: | |
331 | return ret; | |
332 | } | |
333 | ||
334 | static void __exit wl1251_spi_exit(void) | |
335 | { | |
336 | spi_unregister_driver(&wl1251_spi_driver); | |
337 | ||
338 | wl1251_notice("unloaded"); | |
339 | } | |
340 | ||
341 | module_init(wl1251_spi_init); | |
342 | module_exit(wl1251_spi_exit); | |
343 | ||
344 | MODULE_LICENSE("GPL"); | |
31c726f0 | 345 | MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>"); |
f148cfdd | 346 | MODULE_ALIAS("spi:wl1251"); |