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 * SZ_4K)
76 /* Maximum number of SPI write chunks */
77 #define WSPI_MAX_NUM_OF_CHUNKS \
78 ((SPI_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE) + 1)
81 struct wl12xx_spi_glue {
83 struct platform_device *core;
86 static void wl12xx_spi_reset(struct device *child)
88 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
90 struct spi_transfer t;
93 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
95 dev_err(child->parent,
96 "could not allocate cmd for spi reset\n");
100 memset(&t, 0, sizeof(t));
101 spi_message_init(&m);
103 memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
106 t.len = WSPI_INIT_CMD_LEN;
107 spi_message_add_tail(&t, &m);
109 spi_sync(to_spi_device(glue->dev), &m);
114 static void wl12xx_spi_init(struct device *child)
116 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
117 struct spi_transfer t;
118 struct spi_message m;
119 u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
122 dev_err(child->parent,
123 "could not allocate cmd for spi init\n");
127 memset(&t, 0, sizeof(t));
128 spi_message_init(&m);
131 * Set WSPI_INIT_COMMAND
132 * the data is being send from the MSB to LSB
136 cmd[2] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
139 cmd[5] = HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
140 cmd[5] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
142 cmd[6] = WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
143 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
145 if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
146 cmd[6] |= WSPI_INIT_CMD_DIS_FIXEDBUSY;
148 cmd[6] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
150 cmd[7] = crc7_be(0, cmd+2, WSPI_INIT_CMD_CRC_LEN) | WSPI_INIT_CMD_END;
152 * The above is the logical order; it must actually be stored
153 * in the buffer byte-swapped.
155 __swab32s((u32 *)cmd);
156 __swab32s((u32 *)cmd+1);
159 t.len = WSPI_INIT_CMD_LEN;
160 spi_message_add_tail(&t, &m);
162 spi_sync(to_spi_device(glue->dev), &m);
166 #define WL1271_BUSY_WORD_TIMEOUT 1000
168 static int wl12xx_spi_read_busy(struct device *child)
170 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
171 struct wl1271 *wl = dev_get_drvdata(child);
172 struct spi_transfer t[1];
173 struct spi_message m;
175 int num_busy_bytes = 0;
178 * Read further busy words from SPI until a non-busy word is
179 * encountered, then read the data itself into the buffer.
182 num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT;
183 busy_buf = wl->buffer_busyword;
184 while (num_busy_bytes) {
186 spi_message_init(&m);
187 memset(t, 0, sizeof(t));
188 t[0].rx_buf = busy_buf;
189 t[0].len = sizeof(u32);
190 t[0].cs_change = true;
191 spi_message_add_tail(&t[0], &m);
192 spi_sync(to_spi_device(glue->dev), &m);
198 /* The SPI bus is unresponsive, the read failed. */
199 dev_err(child->parent, "SPI read busy-word timeout!\n");
203 static int __must_check wl12xx_spi_raw_read(struct device *child, int addr,
204 void *buf, size_t len, bool fixed)
206 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
207 struct wl1271 *wl = dev_get_drvdata(child);
208 struct spi_transfer t[2];
209 struct spi_message m;
215 chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len);
217 cmd = &wl->buffer_cmd;
218 busy_buf = wl->buffer_busyword;
221 *cmd |= WSPI_CMD_READ;
222 *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) &
223 WSPI_CMD_BYTE_LENGTH;
224 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
227 *cmd |= WSPI_CMD_FIXED;
229 spi_message_init(&m);
230 memset(t, 0, sizeof(t));
234 t[0].cs_change = true;
235 spi_message_add_tail(&t[0], &m);
237 /* Busy and non busy words read */
238 t[1].rx_buf = busy_buf;
239 t[1].len = WL1271_BUSY_WORD_LEN;
240 t[1].cs_change = true;
241 spi_message_add_tail(&t[1], &m);
243 spi_sync(to_spi_device(glue->dev), &m);
245 if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1) &&
246 wl12xx_spi_read_busy(child)) {
247 memset(buf, 0, chunk_len);
251 spi_message_init(&m);
252 memset(t, 0, sizeof(t));
255 t[0].len = chunk_len;
256 t[0].cs_change = true;
257 spi_message_add_tail(&t[0], &m);
259 spi_sync(to_spi_device(glue->dev), &m);
270 static int __must_check wl12xx_spi_raw_write(struct device *child, int addr,
271 void *buf, size_t len, bool fixed)
273 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent);
274 /* SPI write buffers - 2 for each chunk */
275 struct spi_transfer t[2 * WSPI_MAX_NUM_OF_CHUNKS];
276 struct spi_message m;
277 u32 commands[WSPI_MAX_NUM_OF_CHUNKS]; /* 1 command per chunk */
282 WARN_ON(len > SPI_AGGR_BUFFER_SIZE);
284 spi_message_init(&m);
285 memset(t, 0, sizeof(t));
290 chunk_len = min_t(size_t, WSPI_MAX_CHUNK_SIZE, len);
293 *cmd |= WSPI_CMD_WRITE;
294 *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) &
295 WSPI_CMD_BYTE_LENGTH;
296 *cmd |= addr & WSPI_CMD_BYTE_ADDR;
299 *cmd |= WSPI_CMD_FIXED;
302 t[i].len = sizeof(*cmd);
303 spi_message_add_tail(&t[i++], &m);
306 t[i].len = chunk_len;
307 spi_message_add_tail(&t[i++], &m);
316 spi_sync(to_spi_device(glue->dev), &m);
321 static struct wl1271_if_operations spi_ops = {
322 .read = wl12xx_spi_raw_read,
323 .write = wl12xx_spi_raw_write,
324 .reset = wl12xx_spi_reset,
325 .init = wl12xx_spi_init,
326 .set_block_size = NULL,
329 static int wl1271_probe(struct spi_device *spi)
331 struct wl12xx_spi_glue *glue;
332 struct wlcore_platdev_data pdev_data;
333 struct resource res[1];
336 memset(&pdev_data, 0x00, sizeof(pdev_data));
338 /* TODO: add DT parsing when needed */
340 pdev_data.if_ops = &spi_ops;
342 glue = devm_kzalloc(&spi->dev, sizeof(*glue), GFP_KERNEL);
344 dev_err(&spi->dev, "can't allocate glue\n");
348 glue->dev = &spi->dev;
350 spi_set_drvdata(spi, glue);
352 /* This is the only SPI value that we need to set here, the rest
353 * comes from the board-peripherals file */
354 spi->bits_per_word = 32;
356 ret = spi_setup(spi);
358 dev_err(glue->dev, "spi_setup failed\n");
362 glue->core = platform_device_alloc("wl12xx", PLATFORM_DEVID_AUTO);
364 dev_err(glue->dev, "can't allocate platform_device\n");
368 glue->core->dev.parent = &spi->dev;
370 memset(res, 0x00, sizeof(res));
372 res[0].start = spi->irq;
373 res[0].flags = IORESOURCE_IRQ;
376 ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res));
378 dev_err(glue->dev, "can't add resources\n");
382 ret = platform_device_add_data(glue->core, &pdev_data,
385 dev_err(glue->dev, "can't add platform data\n");
389 ret = platform_device_add(glue->core);
391 dev_err(glue->dev, "can't register platform device\n");
398 platform_device_put(glue->core);
402 static int wl1271_remove(struct spi_device *spi)
404 struct wl12xx_spi_glue *glue = spi_get_drvdata(spi);
406 platform_device_unregister(glue->core);
412 static struct spi_driver wl1271_spi_driver = {
414 .name = "wl1271_spi",
417 .probe = wl1271_probe,
418 .remove = wl1271_remove,
421 module_spi_driver(wl1271_spi_driver);
422 MODULE_LICENSE("GPL");
423 MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>");
424 MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>");
425 MODULE_ALIAS("spi:wl1271");