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