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/slab.h>
28 #include <linux/swab.h>
29 #include <linux/crc7.h>
30 #include <linux/spi/spi.h>
31 #include <linux/wl12xx.h>
32 #include <linux/platform_device.h>
35 #include "wl12xx_80211.h"
38 #define WSPI_CMD_READ 0x40000000
39 #define WSPI_CMD_WRITE 0x00000000
40 #define WSPI_CMD_FIXED 0x20000000
41 #define WSPI_CMD_BYTE_LENGTH 0x1FFE0000
42 #define WSPI_CMD_BYTE_LENGTH_OFFSET 17
43 #define WSPI_CMD_BYTE_ADDR 0x0001FFFF
45 #define WSPI_INIT_CMD_CRC_LEN 5
47 #define WSPI_INIT_CMD_START 0x00
48 #define WSPI_INIT_CMD_TX 0x40
49 /* the extra bypass bit is sampled by the TNET as '1' */
50 #define WSPI_INIT_CMD_BYPASS_BIT 0x80
51 #define WSPI_INIT_CMD_FIXEDBUSY_LEN 0x07
52 #define WSPI_INIT_CMD_EN_FIXEDBUSY 0x80
53 #define WSPI_INIT_CMD_DIS_FIXEDBUSY 0x00
54 #define WSPI_INIT_CMD_IOD 0x40
55 #define WSPI_INIT_CMD_IP 0x20
56 #define WSPI_INIT_CMD_CS 0x10
57 #define WSPI_INIT_CMD_WS 0x08
58 #define WSPI_INIT_CMD_WSPI 0x01
59 #define WSPI_INIT_CMD_END 0x01
61 #define WSPI_INIT_CMD_LEN 8
63 #define HW_ACCESS_WSPI_FIXED_BUSY_LEN \
64 ((WL1271_BUSY_WORD_LEN - 4) / sizeof(u32))
65 #define HW_ACCESS_WSPI_INIT_CMD_MASK 0
67 /* HW limitation: maximum possible chunk size is 4095 bytes */
68 #define WSPI_MAX_CHUNK_SIZE 4092
71 * only support SPI for 12xx - this code should be reworked when 18xx
72 * support is introduced
74 #define SPI_AGGR_BUFFER_SIZE (4 * PAGE_SIZE)
76 #define WSPI_MAX_NUM_OF_CHUNKS (SPI_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE)
78 struct wl12xx_spi_glue {
80 struct platform_device *core;
83 static void wl12xx_spi_reset(struct device *child)
85 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
87 struct spi_transfer t;
90 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
92 dev_err(child->parent,
93 "could not allocate cmd for spi reset\n");
97 memset(&t, 0, sizeof(t));
100 memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
103 t.len = WSPI_INIT_CMD_LEN;
104 spi_message_add_tail(&t, &m);
106 spi_sync(to_spi_device(glue->dev), &m);
111 static void wl12xx_spi_init(struct device *child)
113 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
114 struct spi_transfer t;
115 struct spi_message m;
116 u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
119 dev_err(child->parent,
120 "could not allocate cmd for spi init\n");
124 memset(&t, 0, sizeof(t));
125 spi_message_init(&m);
128 * Set WSPI_INIT_COMMAND
129 * the data is being send from the MSB to LSB
133 cmd[2] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
136 cmd[5] = HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
137 cmd[5] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
139 cmd[6] = WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
140 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
142 if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
143 cmd[6] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;
145 cmd[6] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
147 cmd[7] = crc7_be(0, cmd+2, WSPI_INIT_CMD_CRC_LEN) | WSPI_INIT_CMD_END;
149 * The above is the logical order; it must actually be stored
150 * in the buffer byte-swapped.
152 __swab32s((u32 *)cmd);
153 __swab32s((u32 *)cmd+1);
156 t.len = WSPI_INIT_CMD_LEN;
157 spi_message_add_tail(&t, &m);
159 spi_sync(to_spi_device(glue->dev), &m);
163 #define WL1271_BUSY_WORD_TIMEOUT 1000
165 static int wl12xx_spi_read_busy(struct device *child)
167 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
168 struct wl1271 *wl = dev_get_drvdata(child);
169 struct spi_transfer t[1];
170 struct spi_message m;
172 int num_busy_bytes = 0;
175 * Read further busy words from SPI until a non-busy word is
176 * encountered, then read the data itself into the buffer.
179 num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT;
180 busy_buf = wl->buffer_busyword;
181 while (num_busy_bytes) {
183 spi_message_init(&m);
184 memset(t, 0, sizeof(t));
185 t[0].rx_buf = busy_buf;
186 t[0].len = sizeof(u32);
187 t[0].cs_change = true;
188 spi_message_add_tail(&t[0], &m);
189 spi_sync(to_spi_device(glue->dev), &m);
195 /* The SPI bus is unresponsive, the read failed. */
196 dev_err(child->parent, "SPI read busy-word timeout!\n");
200 static int __must_check wl12xx_spi_raw_read(struct device *child, int addr,
201 void *buf, size_t len, bool fixed)
203 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
204 struct wl1271 *wl = dev_get_drvdata(child);
205 struct spi_transfer t[2];
206 struct spi_message m;
212 chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len);
214 cmd = &wl->buffer_cmd;
215 busy_buf = wl->buffer_busyword;
218 *cmd |= WSPI_CMD_READ;
219 *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) &
220 WSPI_CMD_BYTE_LENGTH;
221 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
224 *cmd |= WSPI_CMD_FIXED;
226 spi_message_init(&m);
227 memset(t, 0, sizeof(t));
231 t[0].cs_change = true;
232 spi_message_add_tail(&t[0], &m);
234 /* Busy and non busy words read */
235 t[1].rx_buf = busy_buf;
236 t[1].len = WL1271_BUSY_WORD_LEN;
237 t[1].cs_change = true;
238 spi_message_add_tail(&t[1], &m);
240 spi_sync(to_spi_device(glue->dev), &m);
242 if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1) &&
243 wl12xx_spi_read_busy(child)) {
244 memset(buf, 0, chunk_len);
248 spi_message_init(&m);
249 memset(t, 0, sizeof(t));
252 t[0].len = chunk_len;
253 t[0].cs_change = true;
254 spi_message_add_tail(&t[0], &m);
256 spi_sync(to_spi_device(glue->dev), &m);
267 static int __must_check wl12xx_spi_raw_write(struct device *child, int addr,
268 void *buf, size_t len, bool fixed)
270 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
271 struct spi_transfer t[2 * (WSPI_MAX_NUM_OF_CHUNKS + 1)];
272 struct spi_message m;
273 u32 commands[WSPI_MAX_NUM_OF_CHUNKS];
278 WARN_ON(len > SPI_AGGR_BUFFER_SIZE);
280 spi_message_init(&m);
281 memset(t, 0, sizeof(t));
286 chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len);
289 *cmd |= WSPI_CMD_WRITE;
290 *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) &
291 WSPI_CMD_BYTE_LENGTH;
292 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
295 *cmd |= WSPI_CMD_FIXED;
298 t[i].len = sizeof(*cmd);
299 spi_message_add_tail(&t[i++], &m);
302 t[i].len = chunk_len;
303 spi_message_add_tail(&t[i++], &m);
312 spi_sync(to_spi_device(glue->dev), &m);
317 static struct wl1271_if_operations spi_ops = {
318 .read = wl12xx_spi_raw_read,
319 .write = wl12xx_spi_raw_write,
320 .reset = wl12xx_spi_reset,
321 .init = wl12xx_spi_init,
322 .set_block_size = NULL,
325 static int wl1271_probe(struct spi_device *spi)
327 struct wl12xx_spi_glue *glue;
328 struct wlcore_platdev_data pdev_data;
329 struct resource res[1];
332 memset(&pdev_data, 0x00, sizeof(pdev_data));
334 /* TODO: add DT parsing when needed */
336 pdev_data.if_ops = &spi_ops;
338 glue = devm_kzalloc(&spi->dev, sizeof(*glue), GFP_KERNEL);
340 dev_err(&spi->dev, "can't allocate glue\n");
344 glue->dev = &spi->dev;
346 spi_set_drvdata(spi, glue);
348 /* This is the only SPI value that we need to set here, the rest
349 * comes from the board-peripherals file */
350 spi->bits_per_word = 32;
352 ret = spi_setup(spi);
354 dev_err(glue->dev, "spi_setup failed\n");
358 glue->core = platform_device_alloc("wl12xx", PLATFORM_DEVID_AUTO);
360 dev_err(glue->dev, "can't allocate platform_device\n");
364 glue->core->dev.parent = &spi->dev;
366 memset(res, 0x00, sizeof(res));
368 res[0].start = spi->irq;
369 res[0].flags = IORESOURCE_IRQ;
372 ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res));
374 dev_err(glue->dev, "can't add resources\n");
378 ret = platform_device_add_data(glue->core, &pdev_data,
381 dev_err(glue->dev, "can't add platform data\n");
385 ret = platform_device_add(glue->core);
387 dev_err(glue->dev, "can't register platform device\n");
394 platform_device_put(glue->core);
398 static int wl1271_remove(struct spi_device *spi)
400 struct wl12xx_spi_glue *glue = spi_get_drvdata(spi);
402 platform_device_unregister(glue->core);
408 static struct spi_driver wl1271_spi_driver = {
410 .name = "wl1271_spi",
411 .owner = THIS_MODULE,
414 .probe = wl1271_probe,
415 .remove = wl1271_remove,
418 module_spi_driver(wl1271_spi_driver);
419 MODULE_LICENSE("GPL");
420 MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>");
421 MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
422 MODULE_ALIAS("spi:wl1271");