2 * This file is part of wl1251
4 * Copyright (C) 2008 Nokia Corporation
6 * Contact: Kalle Valo <kalle.valo@nokia.com>
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.
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.
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
24 #include <linux/irq.h>
25 #include <linux/module.h>
26 #include <linux/crc7.h>
27 #include <linux/spi/spi.h>
28 #include <linux/spi/wl12xx.h>
31 #include "wl1251_reg.h"
32 #include "wl1251_spi.h"
34 static irqreturn_t wl1251_irq(int irq, void *cookie)
38 wl1251_debug(DEBUG_IRQ, "IRQ");
42 ieee80211_queue_work(wl->hw, &wl->irq_work);
47 static struct spi_device *wl_to_spi(struct wl1251 *wl)
52 static void wl1251_spi_reset(struct wl1251 *wl)
55 struct spi_transfer t;
58 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
60 wl1251_error("could not allocate cmd for spi reset");
64 memset(&t, 0, sizeof(t));
67 memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
70 t.len = WSPI_INIT_CMD_LEN;
71 spi_message_add_tail(&t, &m);
73 spi_sync(wl_to_spi(wl), &m);
75 wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
78 static void wl1251_spi_wake(struct wl1251 *wl)
80 u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd;
81 struct spi_transfer t;
84 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
86 wl1251_error("could not allocate cmd for spi init");
90 memset(crc, 0, sizeof(crc));
91 memset(&t, 0, sizeof(t));
95 * Set WSPI_INIT_COMMAND
96 * the data is being send from the MSB to LSB
100 cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
103 cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
104 cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
106 if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
107 cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;
109 cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
111 cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
112 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
120 cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1;
121 cmd[4] |= WSPI_INIT_CMD_END;
124 t.len = WSPI_INIT_CMD_LEN;
125 spi_message_add_tail(&t, &m);
127 spi_sync(wl_to_spi(wl), &m);
129 wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
132 static void wl1251_spi_reset_wake(struct wl1251 *wl)
134 wl1251_spi_reset(wl);
138 static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf,
141 struct spi_transfer t[3];
142 struct spi_message m;
146 cmd = &wl->buffer_cmd;
147 busy_buf = wl->buffer_busyword;
150 *cmd |= WSPI_CMD_READ;
151 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
152 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
154 spi_message_init(&m);
155 memset(t, 0, sizeof(t));
159 spi_message_add_tail(&t[0], &m);
161 /* Busy and non busy words read */
162 t[1].rx_buf = busy_buf;
163 t[1].len = WL1251_BUSY_WORD_LEN;
164 spi_message_add_tail(&t[1], &m);
168 spi_message_add_tail(&t[2], &m);
170 spi_sync(wl_to_spi(wl), &m);
172 /* FIXME: check busy words */
174 wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
175 wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
178 static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf,
181 struct spi_transfer t[2];
182 struct spi_message m;
185 cmd = &wl->buffer_cmd;
188 *cmd |= WSPI_CMD_WRITE;
189 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
190 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
192 spi_message_init(&m);
193 memset(t, 0, sizeof(t));
196 t[0].len = sizeof(*cmd);
197 spi_message_add_tail(&t[0], &m);
201 spi_message_add_tail(&t[1], &m);
203 spi_sync(wl_to_spi(wl), &m);
205 wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
206 wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
209 static void wl1251_spi_enable_irq(struct wl1251 *wl)
211 return enable_irq(wl->irq);
214 static void wl1251_spi_disable_irq(struct wl1251 *wl)
216 return disable_irq(wl->irq);
219 static const struct wl1251_if_operations wl1251_spi_ops = {
220 .read = wl1251_spi_read,
221 .write = wl1251_spi_write,
222 .reset = wl1251_spi_reset_wake,
223 .enable_irq = wl1251_spi_enable_irq,
224 .disable_irq = wl1251_spi_disable_irq,
227 static int __devinit wl1251_spi_probe(struct spi_device *spi)
229 struct wl12xx_platform_data *pdata;
230 struct ieee80211_hw *hw;
234 pdata = spi->dev.platform_data;
236 wl1251_error("no platform data");
240 hw = wl1251_alloc_hw();
246 SET_IEEE80211_DEV(hw, &spi->dev);
247 dev_set_drvdata(&spi->dev, wl);
249 wl->if_ops = &wl1251_spi_ops;
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;
255 ret = spi_setup(spi);
257 wl1251_error("spi_setup failed");
261 wl->set_power = pdata->set_power;
262 if (!wl->set_power) {
263 wl1251_error("set power function missing in platform data");
269 wl1251_error("irq missing in platform data");
273 wl->use_eeprom = pdata->use_eeprom;
275 ret = request_irq(wl->irq, wl1251_irq, 0, DRIVER_NAME, wl);
277 wl1251_error("request_irq() failed: %d", ret);
281 set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
283 disable_irq(wl->irq);
285 ret = wl1251_init_ieee80211(wl);
292 free_irq(wl->irq, wl);
295 ieee80211_free_hw(hw);
300 static int __devexit wl1251_spi_remove(struct spi_device *spi)
302 struct wl1251 *wl = dev_get_drvdata(&spi->dev);
304 free_irq(wl->irq, wl);
310 static struct spi_driver wl1251_spi_driver = {
313 .bus = &spi_bus_type,
314 .owner = THIS_MODULE,
317 .probe = wl1251_spi_probe,
318 .remove = __devexit_p(wl1251_spi_remove),
321 static int __init wl1251_spi_init(void)
325 ret = spi_register_driver(&wl1251_spi_driver);
327 wl1251_error("failed to register spi driver: %d", ret);
335 static void __exit wl1251_spi_exit(void)
337 spi_unregister_driver(&wl1251_spi_driver);
339 wl1251_notice("unloaded");
342 module_init(wl1251_spi_init);
343 module_exit(wl1251_spi_exit);
345 MODULE_LICENSE("GPL");
346 MODULE_AUTHOR("Kalle Valo <kalle.valo@nokia.com>");