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/interrupt.h>
25 #include <linux/irq.h>
26 #include <linux/module.h>
27 #include <linux/crc7.h>
28 #include <linux/spi/spi.h>
29 #include <linux/wl12xx.h>
30 #include <linux/platform_device.h>
31 #include <linux/slab.h>
34 #include "wl12xx_80211.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 /* HW limitation: maximum possible chunk size is 4095 bytes */
67 #define WSPI_MAX_CHUNK_SIZE 4092
69 #define WSPI_MAX_NUM_OF_CHUNKS (WL1271_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE)
71 struct wl12xx_spi_glue {
73 struct platform_device *core;
76 static void wl12xx_spi_reset(struct device *child)
78 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
80 struct spi_transfer t;
83 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
85 dev_err(child->parent,
86 "could not allocate cmd for spi reset\n");
90 memset(&t, 0, sizeof(t));
93 memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
96 t.len = WSPI_INIT_CMD_LEN;
97 spi_message_add_tail(&t, &m);
99 spi_sync(to_spi_device(glue->dev), &m);
104 static void wl12xx_spi_init(struct device *child)
106 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
107 u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd;
108 struct spi_transfer t;
109 struct spi_message m;
111 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
113 dev_err(child->parent,
114 "could not allocate cmd for spi init\n");
118 memset(crc, 0, sizeof(crc));
119 memset(&t, 0, sizeof(t));
120 spi_message_init(&m);
123 * Set WSPI_INIT_COMMAND
124 * the data is being send from the MSB to LSB
128 cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
131 cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
132 cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
134 if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
135 cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;
137 cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
139 cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
140 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
148 cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1;
149 cmd[4] |= WSPI_INIT_CMD_END;
152 t.len = WSPI_INIT_CMD_LEN;
153 spi_message_add_tail(&t, &m);
155 spi_sync(to_spi_device(glue->dev), &m);
159 #define WL1271_BUSY_WORD_TIMEOUT 1000
161 static int wl12xx_spi_read_busy(struct device *child)
163 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
164 struct wl1271 *wl = dev_get_drvdata(child);
165 struct spi_transfer t[1];
166 struct spi_message m;
168 int num_busy_bytes = 0;
171 * Read further busy words from SPI until a non-busy word is
172 * encountered, then read the data itself into the buffer.
175 num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT;
176 busy_buf = wl->buffer_busyword;
177 while (num_busy_bytes) {
179 spi_message_init(&m);
180 memset(t, 0, sizeof(t));
181 t[0].rx_buf = busy_buf;
182 t[0].len = sizeof(u32);
183 t[0].cs_change = true;
184 spi_message_add_tail(&t[0], &m);
185 spi_sync(to_spi_device(glue->dev), &m);
191 /* The SPI bus is unresponsive, the read failed. */
192 dev_err(child->parent, "SPI read busy-word timeout!\n");
196 static void wl12xx_spi_raw_read(struct device *child, int addr, void *buf,
197 size_t len, bool fixed)
199 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
200 struct wl1271 *wl = dev_get_drvdata(child);
201 struct spi_transfer t[2];
202 struct spi_message m;
208 chunk_len = min((size_t)WSPI_MAX_CHUNK_SIZE, len);
210 cmd = &wl->buffer_cmd;
211 busy_buf = wl->buffer_busyword;
214 *cmd |= WSPI_CMD_READ;
215 *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) &
216 WSPI_CMD_BYTE_LENGTH;
217 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
220 *cmd |= WSPI_CMD_FIXED;
222 spi_message_init(&m);
223 memset(t, 0, sizeof(t));
227 t[0].cs_change = true;
228 spi_message_add_tail(&t[0], &m);
230 /* Busy and non busy words read */
231 t[1].rx_buf = busy_buf;
232 t[1].len = WL1271_BUSY_WORD_LEN;
233 t[1].cs_change = true;
234 spi_message_add_tail(&t[1], &m);
236 spi_sync(to_spi_device(glue->dev), &m);
238 if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1) &&
239 wl12xx_spi_read_busy(child)) {
240 memset(buf, 0, chunk_len);
244 spi_message_init(&m);
245 memset(t, 0, sizeof(t));
248 t[0].len = chunk_len;
249 t[0].cs_change = true;
250 spi_message_add_tail(&t[0], &m);
252 spi_sync(to_spi_device(glue->dev), &m);
261 static void wl12xx_spi_raw_write(struct device *child, int addr, void *buf,
262 size_t len, bool fixed)
264 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
265 struct spi_transfer t[2 * WSPI_MAX_NUM_OF_CHUNKS];
266 struct spi_message m;
267 u32 commands[WSPI_MAX_NUM_OF_CHUNKS];
272 WARN_ON(len > WL1271_AGGR_BUFFER_SIZE);
274 spi_message_init(&m);
275 memset(t, 0, sizeof(t));
280 chunk_len = min((size_t)WSPI_MAX_CHUNK_SIZE, len);
283 *cmd |= WSPI_CMD_WRITE;
284 *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) &
285 WSPI_CMD_BYTE_LENGTH;
286 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
289 *cmd |= WSPI_CMD_FIXED;
292 t[i].len = sizeof(*cmd);
293 spi_message_add_tail(&t[i++], &m);
296 t[i].len = chunk_len;
297 spi_message_add_tail(&t[i++], &m);
306 spi_sync(to_spi_device(glue->dev), &m);
309 static struct wl1271_if_operations spi_ops = {
310 .read = wl12xx_spi_raw_read,
311 .write = wl12xx_spi_raw_write,
312 .reset = wl12xx_spi_reset,
313 .init = wl12xx_spi_init,
314 .set_block_size = NULL,
317 static int __devinit wl1271_probe(struct spi_device *spi)
319 struct wl12xx_spi_glue *glue;
320 struct wl12xx_platform_data *pdata;
321 struct resource res[1];
324 pdata = spi->dev.platform_data;
326 dev_err(&spi->dev, "no platform data\n");
330 pdata->ops = &spi_ops;
332 glue = kzalloc(sizeof(*glue), GFP_KERNEL);
334 dev_err(&spi->dev, "can't allocate glue\n");
338 glue->dev = &spi->dev;
340 spi_set_drvdata(spi, glue);
342 /* This is the only SPI value that we need to set here, the rest
343 * comes from the board-peripherals file */
344 spi->bits_per_word = 32;
346 ret = spi_setup(spi);
348 dev_err(glue->dev, "spi_setup failed\n");
352 glue->core = platform_device_alloc("wl12xx", -1);
354 dev_err(glue->dev, "can't allocate platform_device\n");
359 glue->core->dev.parent = &spi->dev;
361 memset(res, 0x00, sizeof(res));
363 res[0].start = spi->irq;
364 res[0].flags = IORESOURCE_IRQ;
367 ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res));
369 dev_err(glue->dev, "can't add resources\n");
373 ret = platform_device_add_data(glue->core, pdata, sizeof(*pdata));
375 dev_err(glue->dev, "can't add platform data\n");
379 ret = platform_device_add(glue->core);
381 dev_err(glue->dev, "can't register platform device\n");
388 platform_device_put(glue->core);
396 static int __devexit wl1271_remove(struct spi_device *spi)
398 struct wl12xx_spi_glue *glue = spi_get_drvdata(spi);
400 platform_device_del(glue->core);
401 platform_device_put(glue->core);
408 static struct spi_driver wl1271_spi_driver = {
410 .name = "wl1271_spi",
411 .owner = THIS_MODULE,
414 .probe = wl1271_probe,
415 .remove = __devexit_p(wl1271_remove),
418 static int __init wl1271_init(void)
420 return spi_register_driver(&wl1271_spi_driver);
423 static void __exit wl1271_exit(void)
425 spi_unregister_driver(&wl1271_spi_driver);
428 module_init(wl1271_init);
429 module_exit(wl1271_exit);
431 MODULE_LICENSE("GPL");
432 MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>");
433 MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
434 MODULE_FIRMWARE(WL127X_FW_NAME_SINGLE);
435 MODULE_FIRMWARE(WL127X_FW_NAME_MULTI);
436 MODULE_FIRMWARE(WL127X_PLT_FW_NAME);
437 MODULE_FIRMWARE(WL128X_FW_NAME_SINGLE);
438 MODULE_FIRMWARE(WL128X_FW_NAME_MULTI);
439 MODULE_FIRMWARE(WL128X_PLT_FW_NAME);
440 MODULE_ALIAS("spi:wl1271");