2 * This file is part of wl1271
4 * Copyright (C) 2008-2009 Nokia Corporation
6 * Contact: Luciano Coelho <luciano.coelho@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/wl12xx.h>
29 #include <linux/slab.h>
32 #include "wl12xx_80211.h"
33 #include "wl1271_io.h"
35 #include "wl1271_reg.h"
37 #define WSPI_CMD_READ 0x40000000
38 #define WSPI_CMD_WRITE 0x00000000
39 #define WSPI_CMD_FIXED 0x20000000
40 #define WSPI_CMD_BYTE_LENGTH 0x1FFE0000
41 #define WSPI_CMD_BYTE_LENGTH_OFFSET 17
42 #define WSPI_CMD_BYTE_ADDR 0x0001FFFF
44 #define WSPI_INIT_CMD_CRC_LEN 5
46 #define WSPI_INIT_CMD_START 0x00
47 #define WSPI_INIT_CMD_TX 0x40
48 /* the extra bypass bit is sampled by the TNET as '1' */
49 #define WSPI_INIT_CMD_BYPASS_BIT 0x80
50 #define WSPI_INIT_CMD_FIXEDBUSY_LEN 0x07
51 #define WSPI_INIT_CMD_EN_FIXEDBUSY 0x80
52 #define WSPI_INIT_CMD_DIS_FIXEDBUSY 0x00
53 #define WSPI_INIT_CMD_IOD 0x40
54 #define WSPI_INIT_CMD_IP 0x20
55 #define WSPI_INIT_CMD_CS 0x10
56 #define WSPI_INIT_CMD_WS 0x08
57 #define WSPI_INIT_CMD_WSPI 0x01
58 #define WSPI_INIT_CMD_END 0x01
60 #define WSPI_INIT_CMD_LEN 8
62 #define HW_ACCESS_WSPI_FIXED_BUSY_LEN \
63 ((WL1271_BUSY_WORD_LEN - 4) / sizeof(u32))
64 #define HW_ACCESS_WSPI_INIT_CMD_MASK 0
66 static inline struct spi_device *wl_to_spi(struct wl1271 *wl)
71 static struct device *wl1271_spi_wl_to_dev(struct wl1271 *wl)
73 return &(wl_to_spi(wl)->dev);
76 static void wl1271_spi_disable_interrupts(struct wl1271 *wl)
81 static void wl1271_spi_enable_interrupts(struct wl1271 *wl)
86 static void wl1271_spi_reset(struct wl1271 *wl)
89 struct spi_transfer t;
92 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
94 wl1271_error("could not allocate cmd for spi reset");
98 memset(&t, 0, sizeof(t));
101 memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
104 t.len = WSPI_INIT_CMD_LEN;
105 spi_message_add_tail(&t, &m);
107 spi_sync(wl_to_spi(wl), &m);
110 wl1271_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
113 static void wl1271_spi_init(struct wl1271 *wl)
115 u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd;
116 struct spi_transfer t;
117 struct spi_message m;
119 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
121 wl1271_error("could not allocate cmd for spi init");
125 memset(crc, 0, sizeof(crc));
126 memset(&t, 0, sizeof(t));
127 spi_message_init(&m);
130 * Set WSPI_INIT_COMMAND
131 * the data is being send from the MSB to LSB
135 cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
138 cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
139 cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
141 if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
142 cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;
144 cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
146 cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
147 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
155 cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1;
156 cmd[4] |= WSPI_INIT_CMD_END;
159 t.len = WSPI_INIT_CMD_LEN;
160 spi_message_add_tail(&t, &m);
162 spi_sync(wl_to_spi(wl), &m);
163 wl1271_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
167 #define WL1271_BUSY_WORD_TIMEOUT 1000
169 static int wl1271_spi_read_busy(struct wl1271 *wl)
171 struct spi_transfer t[1];
172 struct spi_message m;
174 int num_busy_bytes = 0;
177 * Read further busy words from SPI until a non-busy word is
178 * encountered, then read the data itself into the buffer.
181 num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT;
182 busy_buf = wl->buffer_busyword;
183 while (num_busy_bytes) {
185 spi_message_init(&m);
186 memset(t, 0, sizeof(t));
187 t[0].rx_buf = busy_buf;
188 t[0].len = sizeof(u32);
189 t[0].cs_change = true;
190 spi_message_add_tail(&t[0], &m);
191 spi_sync(wl_to_spi(wl), &m);
197 /* The SPI bus is unresponsive, the read failed. */
198 wl1271_error("SPI read busy-word timeout!\n");
202 static void wl1271_spi_raw_read(struct wl1271 *wl, int addr, void *buf,
203 size_t len, bool fixed)
205 struct spi_transfer t[3];
206 struct spi_message m;
210 cmd = &wl->buffer_cmd;
211 busy_buf = wl->buffer_busyword;
214 *cmd |= WSPI_CMD_READ;
215 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
216 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
219 *cmd |= WSPI_CMD_FIXED;
221 spi_message_init(&m);
222 memset(t, 0, sizeof(t));
226 t[0].cs_change = true;
227 spi_message_add_tail(&t[0], &m);
229 /* Busy and non busy words read */
230 t[1].rx_buf = busy_buf;
231 t[1].len = WL1271_BUSY_WORD_LEN;
232 t[1].cs_change = true;
233 spi_message_add_tail(&t[1], &m);
235 spi_sync(wl_to_spi(wl), &m);
237 if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1) &&
238 wl1271_spi_read_busy(wl)) {
243 spi_message_init(&m);
244 memset(t, 0, sizeof(t));
248 t[0].cs_change = true;
249 spi_message_add_tail(&t[0], &m);
251 spi_sync(wl_to_spi(wl), &m);
253 wl1271_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
254 wl1271_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
257 static void wl1271_spi_raw_write(struct wl1271 *wl, int addr, void *buf,
258 size_t len, bool fixed)
260 struct spi_transfer t[2];
261 struct spi_message m;
264 cmd = &wl->buffer_cmd;
267 *cmd |= WSPI_CMD_WRITE;
268 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
269 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
272 *cmd |= WSPI_CMD_FIXED;
274 spi_message_init(&m);
275 memset(t, 0, sizeof(t));
278 t[0].len = sizeof(*cmd);
279 spi_message_add_tail(&t[0], &m);
283 spi_message_add_tail(&t[1], &m);
285 spi_sync(wl_to_spi(wl), &m);
287 wl1271_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
288 wl1271_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
291 static irqreturn_t wl1271_irq(int irq, void *cookie)
296 wl1271_debug(DEBUG_IRQ, "IRQ");
300 /* complete the ELP completion */
301 spin_lock_irqsave(&wl->wl_lock, flags);
303 complete(wl->elp_compl);
304 wl->elp_compl = NULL;
307 if (!test_and_set_bit(WL1271_FLAG_IRQ_RUNNING, &wl->flags))
308 ieee80211_queue_work(wl->hw, &wl->irq_work);
309 set_bit(WL1271_FLAG_IRQ_PENDING, &wl->flags);
310 spin_unlock_irqrestore(&wl->wl_lock, flags);
315 static int wl1271_spi_set_power(struct wl1271 *wl, bool enable)
318 wl->set_power(enable);
323 static struct wl1271_if_operations spi_ops = {
324 .read = wl1271_spi_raw_read,
325 .write = wl1271_spi_raw_write,
326 .reset = wl1271_spi_reset,
327 .init = wl1271_spi_init,
328 .power = wl1271_spi_set_power,
329 .dev = wl1271_spi_wl_to_dev,
330 .enable_irq = wl1271_spi_enable_interrupts,
331 .disable_irq = wl1271_spi_disable_interrupts
334 static int __devinit wl1271_probe(struct spi_device *spi)
336 struct wl12xx_platform_data *pdata;
337 struct ieee80211_hw *hw;
341 pdata = spi->dev.platform_data;
343 wl1271_error("no platform data");
347 hw = wl1271_alloc_hw();
353 dev_set_drvdata(&spi->dev, wl);
356 wl->if_ops = &spi_ops;
358 /* This is the only SPI value that we need to set here, the rest
359 * comes from the board-peripherals file */
360 spi->bits_per_word = 32;
362 ret = spi_setup(spi);
364 wl1271_error("spi_setup failed");
368 wl->set_power = pdata->set_power;
369 if (!wl->set_power) {
370 wl1271_error("set power function missing in platform data");
375 wl->ref_clock = pdata->board_ref_clock;
379 wl1271_error("irq missing in platform data");
384 ret = request_irq(wl->irq, wl1271_irq, 0, DRIVER_NAME, wl);
386 wl1271_error("request_irq() failed: %d", ret);
390 set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
392 disable_irq(wl->irq);
394 ret = wl1271_init_ieee80211(wl);
398 ret = wl1271_register_hw(wl);
402 wl1271_notice("initialized");
407 free_irq(wl->irq, wl);
415 static int __devexit wl1271_remove(struct spi_device *spi)
417 struct wl1271 *wl = dev_get_drvdata(&spi->dev);
419 free_irq(wl->irq, wl);
421 wl1271_unregister_hw(wl);
428 static struct spi_driver wl1271_spi_driver = {
430 .name = "wl1271_spi",
431 .bus = &spi_bus_type,
432 .owner = THIS_MODULE,
435 .probe = wl1271_probe,
436 .remove = __devexit_p(wl1271_remove),
439 static int __init wl1271_init(void)
443 ret = spi_register_driver(&wl1271_spi_driver);
445 wl1271_error("failed to register spi driver: %d", ret);
453 static void __exit wl1271_exit(void)
455 spi_unregister_driver(&wl1271_spi_driver);
457 wl1271_notice("unloaded");
460 module_init(wl1271_init);
461 module_exit(wl1271_exit);
463 MODULE_LICENSE("GPL");
464 MODULE_AUTHOR("Luciano Coelho <luciano.coelho@nokia.com>");
465 MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
466 MODULE_FIRMWARE(WL1271_FW_NAME);
467 MODULE_ALIAS("spi:wl1271");