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 #if (LINUX_VERSION_CODE == KERNEL_VERSION(2,6,28))
28 #include <linux/device.h>
30 #include <linux/spi/spi.h>
31 #include <linux/spi/wl12xx.h>
34 #include "wl1251_reg.h"
35 #include "wl1251_spi.h"
37 static irqreturn_t wl1251_irq(int irq, void *cookie)
41 wl1251_debug(DEBUG_IRQ, "IRQ");
45 ieee80211_queue_work(wl->hw, &wl->irq_work);
50 static struct spi_device *wl_to_spi(struct wl1251 *wl)
55 static void wl1251_spi_reset(struct wl1251 *wl)
58 struct spi_transfer t;
61 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
63 wl1251_error("could not allocate cmd for spi reset");
67 memset(&t, 0, sizeof(t));
70 memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
73 t.len = WSPI_INIT_CMD_LEN;
74 spi_message_add_tail(&t, &m);
76 spi_sync(wl_to_spi(wl), &m);
78 wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
81 static void wl1251_spi_wake(struct wl1251 *wl)
83 u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd;
84 struct spi_transfer t;
87 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
89 wl1251_error("could not allocate cmd for spi init");
93 memset(crc, 0, sizeof(crc));
94 memset(&t, 0, sizeof(t));
98 * Set WSPI_INIT_COMMAND
99 * the data is being send from the MSB to LSB
103 cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
106 cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
107 cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
109 if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
110 cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;
112 cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
114 cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
115 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
123 cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1;
124 cmd[4] |= WSPI_INIT_CMD_END;
127 t.len = WSPI_INIT_CMD_LEN;
128 spi_message_add_tail(&t, &m);
130 spi_sync(wl_to_spi(wl), &m);
132 wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
135 static void wl1251_spi_reset_wake(struct wl1251 *wl)
137 wl1251_spi_reset(wl);
141 static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf,
144 struct spi_transfer t[3];
145 struct spi_message m;
149 cmd = &wl->buffer_cmd;
150 busy_buf = wl->buffer_busyword;
153 *cmd |= WSPI_CMD_READ;
154 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
155 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
157 spi_message_init(&m);
158 memset(t, 0, sizeof(t));
162 spi_message_add_tail(&t[0], &m);
164 /* Busy and non busy words read */
165 t[1].rx_buf = busy_buf;
166 t[1].len = WL1251_BUSY_WORD_LEN;
167 spi_message_add_tail(&t[1], &m);
171 spi_message_add_tail(&t[2], &m);
173 spi_sync(wl_to_spi(wl), &m);
175 /* FIXME: check busy words */
177 wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
178 wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
181 static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf,
184 struct spi_transfer t[2];
185 struct spi_message m;
188 cmd = &wl->buffer_cmd;
191 *cmd |= WSPI_CMD_WRITE;
192 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
193 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
195 spi_message_init(&m);
196 memset(t, 0, sizeof(t));
199 t[0].len = sizeof(*cmd);
200 spi_message_add_tail(&t[0], &m);
204 spi_message_add_tail(&t[1], &m);
206 spi_sync(wl_to_spi(wl), &m);
208 wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
209 wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
212 static void wl1251_spi_enable_irq(struct wl1251 *wl)
214 return enable_irq(wl->irq);
217 static void wl1251_spi_disable_irq(struct wl1251 *wl)
219 return disable_irq(wl->irq);
222 static const struct wl1251_if_operations wl1251_spi_ops = {
223 .read = wl1251_spi_read,
224 .write = wl1251_spi_write,
225 .reset = wl1251_spi_reset_wake,
226 .enable_irq = wl1251_spi_enable_irq,
227 .disable_irq = wl1251_spi_disable_irq,
230 static int __devinit wl1251_spi_probe(struct spi_device *spi)
232 struct wl12xx_platform_data *pdata;
233 struct ieee80211_hw *hw;
237 pdata = spi->dev.platform_data;
239 wl1251_error("no platform data");
243 hw = wl1251_alloc_hw();
249 SET_IEEE80211_DEV(hw, &spi->dev);
250 dev_set_drvdata(&spi->dev, wl);
252 wl->if_ops = &wl1251_spi_ops;
254 /* This is the only SPI value that we need to set here, the rest
255 * comes from the board-peripherals file */
256 spi->bits_per_word = 32;
258 ret = spi_setup(spi);
260 wl1251_error("spi_setup failed");
264 wl->set_power = pdata->set_power;
265 if (!wl->set_power) {
266 wl1251_error("set power function missing in platform data");
272 wl1251_error("irq missing in platform data");
276 wl->use_eeprom = pdata->use_eeprom;
278 ret = request_irq(wl->irq, wl1251_irq, 0, DRIVER_NAME, wl);
280 wl1251_error("request_irq() failed: %d", ret);
284 set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
286 disable_irq(wl->irq);
288 ret = wl1251_init_ieee80211(wl);
295 free_irq(wl->irq, wl);
298 ieee80211_free_hw(hw);
303 static int __devexit wl1251_spi_remove(struct spi_device *spi)
305 struct wl1251 *wl = dev_get_drvdata(&spi->dev);
307 free_irq(wl->irq, wl);
313 static struct spi_driver wl1251_spi_driver = {
316 .bus = &spi_bus_type,
317 .owner = THIS_MODULE,
320 .probe = wl1251_spi_probe,
321 .remove = __devexit_p(wl1251_spi_remove),
324 static int __init wl1251_spi_init(void)
328 ret = spi_register_driver(&wl1251_spi_driver);
330 wl1251_error("failed to register spi driver: %d", ret);
338 static void __exit wl1251_spi_exit(void)
340 spi_unregister_driver(&wl1251_spi_driver);
342 wl1251_notice("unloaded");
345 module_init(wl1251_spi_init);
346 module_exit(wl1251_spi_exit);
348 MODULE_LICENSE("GPL");
349 MODULE_AUTHOR("Kalle Valo <kalle.valo@nokia.com>");