1/* 2 * This file is part of wl1271 3 * 4 * Copyright (C) 2008-2009 Nokia Corporation 5 * 6 * Contact: Luciano Coelho <luciano.coelho@nokia.com> 7 * 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. 11 * 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. 16 * 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 20 * 02110-1301 USA 21 * 22 */ 23 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> 32 33#include "wl12xx.h" 34#include "wl12xx_80211.h" 35#include "io.h" 36 37#include "reg.h" 38 39#define WSPI_CMD_READ 0x40000000 40#define WSPI_CMD_WRITE 0x00000000 41#define WSPI_CMD_FIXED 0x20000000 42#define WSPI_CMD_BYTE_LENGTH 0x1FFE0000 43#define WSPI_CMD_BYTE_LENGTH_OFFSET 17 44#define WSPI_CMD_BYTE_ADDR 0x0001FFFF 45 46#define WSPI_INIT_CMD_CRC_LEN 5 47 48#define WSPI_INIT_CMD_START 0x00 49#define WSPI_INIT_CMD_TX 0x40 50/* the extra bypass bit is sampled by the TNET as '1' */ 51#define WSPI_INIT_CMD_BYPASS_BIT 0x80 52#define WSPI_INIT_CMD_FIXEDBUSY_LEN 0x07 53#define WSPI_INIT_CMD_EN_FIXEDBUSY 0x80 54#define WSPI_INIT_CMD_DIS_FIXEDBUSY 0x00 55#define WSPI_INIT_CMD_IOD 0x40 56#define WSPI_INIT_CMD_IP 0x20 57#define WSPI_INIT_CMD_CS 0x10 58#define WSPI_INIT_CMD_WS 0x08 59#define WSPI_INIT_CMD_WSPI 0x01 60#define WSPI_INIT_CMD_END 0x01 61 62#define WSPI_INIT_CMD_LEN 8 63 64#define HW_ACCESS_WSPI_FIXED_BUSY_LEN \ 65 ((WL1271_BUSY_WORD_LEN - 4) / sizeof(u32)) 66#define HW_ACCESS_WSPI_INIT_CMD_MASK 0 67 68/* HW limitation: maximum possible chunk size is 4095 bytes */ 69#define WSPI_MAX_CHUNK_SIZE 4092 70 71#define WSPI_MAX_NUM_OF_CHUNKS (WL1271_AGGR_BUFFER_SIZE / WSPI_MAX_CHUNK_SIZE) 72 73struct wl12xx_spi_glue { 74 struct device *dev; 75 struct platform_device *core; 76}; 77 78static void wl12xx_spi_reset(struct device *child) 79{ 80 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); 81 u8 *cmd; 82 struct spi_transfer t; 83 struct spi_message m; 84 85 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); 86 if (!cmd) { 87 dev_err(child->parent, 88 "could not allocate cmd for spi reset\n"); 89 return; 90 } 91 92 memset(&t, 0, sizeof(t)); 93 spi_message_init(&m); 94 95 memset(cmd, 0xff, WSPI_INIT_CMD_LEN); 96 97 t.tx_buf = cmd; 98 t.len = WSPI_INIT_CMD_LEN; 99 spi_message_add_tail(&t, &m); 100 101 spi_sync(to_spi_device(glue->dev), &m); 102 103 kfree(cmd); 104} 105 106static void wl12xx_spi_init(struct device *child) 107{ 108 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); 109 u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd; 110 struct spi_transfer t; 111 struct spi_message m; 112 113 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); 114 if (!cmd) { 115 dev_err(child->parent, 116 "could not allocate cmd for spi init\n"); 117 return; 118 } 119 120 memset(crc, 0, sizeof(crc)); 121 memset(&t, 0, sizeof(t)); 122 spi_message_init(&m); 123 124 /* 125 * Set WSPI_INIT_COMMAND 126 * the data is being send from the MSB to LSB 127 */ 128 cmd[2] = 0xff; 129 cmd[3] = 0xff; 130 cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX; 131 cmd[0] = 0; 132 cmd[7] = 0; 133 cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3; 134 cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN; 135 136 if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0) 137 cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY; 138 else 139 cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY; 140 141 cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS 142 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS; 143 144 crc[0] = cmd[1]; 145 crc[1] = cmd[0]; 146 crc[2] = cmd[7]; 147 crc[3] = cmd[6]; 148 crc[4] = cmd[5]; 149 150 cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1; 151 cmd[4] |= WSPI_INIT_CMD_END; 152 153 t.tx_buf = cmd; 154 t.len = WSPI_INIT_CMD_LEN; 155 spi_message_add_tail(&t, &m); 156 157 spi_sync(to_spi_device(glue->dev), &m); 158 kfree(cmd); 159} 160 161#define WL1271_BUSY_WORD_TIMEOUT 1000 162 163static int wl12xx_spi_read_busy(struct device *child) 164{ 165 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); 166 struct wl1271 *wl = dev_get_drvdata(child); 167 struct spi_transfer t[1]; 168 struct spi_message m; 169 u32 *busy_buf; 170 int num_busy_bytes = 0; 171 172 /* 173 * Read further busy words from SPI until a non-busy word is 174 * encountered, then read the data itself into the buffer. 175 */ 176 177 num_busy_bytes = WL1271_BUSY_WORD_TIMEOUT; 178 busy_buf = wl->buffer_busyword; 179 while (num_busy_bytes) { 180 num_busy_bytes--; 181 spi_message_init(&m); 182 memset(t, 0, sizeof(t)); 183 t[0].rx_buf = busy_buf; 184 t[0].len = sizeof(u32); 185 t[0].cs_change = true; 186 spi_message_add_tail(&t[0], &m); 187 spi_sync(to_spi_device(glue->dev), &m); 188 189 if (*busy_buf & 0x1) 190 return 0; 191 } 192 193 /* The SPI bus is unresponsive, the read failed. */ 194 dev_err(child->parent, "SPI read busy-word timeout!\n"); 195 return -ETIMEDOUT; 196} 197 198static void wl12xx_spi_raw_read(struct device *child, int addr, void *buf, 199 size_t len, bool fixed) 200{ 201 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); 202 struct wl1271 *wl = dev_get_drvdata(child); 203 struct spi_transfer t[2]; 204 struct spi_message m; 205 u32 *busy_buf; 206 u32 *cmd; 207 u32 chunk_len; 208 209 while (len > 0) { 210 chunk_len = min((size_t)WSPI_MAX_CHUNK_SIZE, len); 211 212 cmd = &wl->buffer_cmd; 213 busy_buf = wl->buffer_busyword; 214 215 *cmd = 0; 216 *cmd |= WSPI_CMD_READ; 217 *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) & 218 WSPI_CMD_BYTE_LENGTH; 219 *cmd |= addr & WSPI_CMD_BYTE_ADDR; 220 221 if (fixed) 222 *cmd |= WSPI_CMD_FIXED; 223 224 spi_message_init(&m); 225 memset(t, 0, sizeof(t)); 226 227 t[0].tx_buf = cmd; 228 t[0].len = 4; 229 t[0].cs_change = true; 230 spi_message_add_tail(&t[0], &m); 231 232 /* Busy and non busy words read */ 233 t[1].rx_buf = busy_buf; 234 t[1].len = WL1271_BUSY_WORD_LEN; 235 t[1].cs_change = true; 236 spi_message_add_tail(&t[1], &m); 237 238 spi_sync(to_spi_device(glue->dev), &m); 239 240 if (!(busy_buf[WL1271_BUSY_WORD_CNT - 1] & 0x1) && 241 wl12xx_spi_read_busy(child)) { 242 memset(buf, 0, chunk_len); 243 return; 244 } 245 246 spi_message_init(&m); 247 memset(t, 0, sizeof(t)); 248 249 t[0].rx_buf = buf; 250 t[0].len = chunk_len; 251 t[0].cs_change = true; 252 spi_message_add_tail(&t[0], &m); 253 254 spi_sync(to_spi_device(glue->dev), &m); 255 256 if (!fixed) 257 addr += chunk_len; 258 buf += chunk_len; 259 len -= chunk_len; 260 } 261} 262 263static void wl12xx_spi_raw_write(struct device *child, int addr, void *buf, 264 size_t len, bool fixed) 265{ 266 struct wl12xx_spi_glue *glue = dev_get_drvdata(child->parent); 267 struct spi_transfer t[2 * WSPI_MAX_NUM_OF_CHUNKS]; 268 struct spi_message m; 269 u32 commands[WSPI_MAX_NUM_OF_CHUNKS]; 270 u32 *cmd; 271 u32 chunk_len; 272 int i; 273 274 WARN_ON(len > WL1271_AGGR_BUFFER_SIZE); 275 276 spi_message_init(&m); 277 memset(t, 0, sizeof(t)); 278 279 cmd = &commands[0]; 280 i = 0; 281 while (len > 0) { 282 chunk_len = min((size_t)WSPI_MAX_CHUNK_SIZE, len); 283 284 *cmd = 0; 285 *cmd |= WSPI_CMD_WRITE; 286 *cmd |= (chunk_len << WSPI_CMD_BYTE_LENGTH_OFFSET) & 287 WSPI_CMD_BYTE_LENGTH; 288 *cmd |= addr & WSPI_CMD_BYTE_ADDR; 289 290 if (fixed) 291 *cmd |= WSPI_CMD_FIXED; 292 293 t[i].tx_buf = cmd; 294 t[i].len = sizeof(*cmd); 295 spi_message_add_tail(&t[i++], &m); 296 297 t[i].tx_buf = buf; 298 t[i].len = chunk_len; 299 spi_message_add_tail(&t[i++], &m); 300 301 if (!fixed) 302 addr += chunk_len; 303 buf += chunk_len; 304 len -= chunk_len; 305 cmd++; 306 } 307 308 spi_sync(to_spi_device(glue->dev), &m); 309} 310 311static struct wl1271_if_operations spi_ops = { 312 .read = wl12xx_spi_raw_read, 313 .write = wl12xx_spi_raw_write, 314 .reset = wl12xx_spi_reset, 315 .init = wl12xx_spi_init, 316 .set_block_size = NULL, 317}; 318 319static int __devinit wl1271_probe(struct spi_device *spi) 320{ 321 struct wl12xx_spi_glue *glue; 322 struct wl12xx_platform_data *pdata; 323 struct resource res[1]; 324 int ret = -ENOMEM; 325 326 pdata = spi->dev.platform_data; 327 if (!pdata) { 328 dev_err(&spi->dev, "no platform data\n"); 329 return -ENODEV; 330 } 331 332 pdata->ops = &spi_ops; 333 334 glue = kzalloc(sizeof(*glue), GFP_KERNEL); 335 if (!glue) { 336 dev_err(&spi->dev, "can't allocate glue\n"); 337 goto out; 338 } 339 340 glue->dev = &spi->dev; 341 342 spi_set_drvdata(spi, glue); 343 344 /* This is the only SPI value that we need to set here, the rest 345 * comes from the board-peripherals file */ 346 spi->bits_per_word = 32; 347 348 ret = spi_setup(spi); 349 if (ret < 0) { 350 dev_err(glue->dev, "spi_setup failed\n"); 351 goto out_free_glue; 352 } 353 354 glue->core = platform_device_alloc("wl12xx", -1); 355 if (!glue->core) { 356 dev_err(glue->dev, "can't allocate platform_device\n"); 357 ret = -ENOMEM; 358 goto out_free_glue; 359 } 360 361 glue->core->dev.parent = &spi->dev; 362 363 memset(res, 0x00, sizeof(res)); 364 365 res[0].start = spi->irq; 366 res[0].flags = IORESOURCE_IRQ; 367 res[0].name = "irq"; 368 369 ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res)); 370 if (ret) { 371 dev_err(glue->dev, "can't add resources\n"); 372 goto out_dev_put; 373 } 374 375 ret = platform_device_add_data(glue->core, pdata, sizeof(*pdata)); 376 if (ret) { 377 dev_err(glue->dev, "can't add platform data\n"); 378 goto out_dev_put; 379 } 380 381 ret = platform_device_add(glue->core); 382 if (ret) { 383 dev_err(glue->dev, "can't register platform device\n"); 384 goto out_dev_put; 385 } 386 387 return 0; 388 389out_dev_put: 390 platform_device_put(glue->core); 391 392out_free_glue: 393 kfree(glue); 394out: 395 return ret; 396} 397 398static int __devexit wl1271_remove(struct spi_device *spi) 399{ 400 struct wl12xx_spi_glue *glue = spi_get_drvdata(spi); 401 402 platform_device_del(glue->core); 403 platform_device_put(glue->core); 404 kfree(glue); 405 406 return 0; 407} 408 409 410static struct spi_driver wl1271_spi_driver = { 411 .driver = { 412 .name = "wl1271_spi", 413 .owner = THIS_MODULE, 414 }, 415 416 .probe = wl1271_probe, 417 .remove = __devexit_p(wl1271_remove), 418}; 419 420static int __init wl1271_init(void) 421{ 422 return spi_register_driver(&wl1271_spi_driver); 423} 424 425static void __exit wl1271_exit(void) 426{ 427 spi_unregister_driver(&wl1271_spi_driver); 428} 429 430module_init(wl1271_init); 431module_exit(wl1271_exit); 432 433MODULE_LICENSE("GPL"); 434MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>"); 435MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>"); 436MODULE_FIRMWARE(WL127X_FW_NAME); 437MODULE_FIRMWARE(WL128X_FW_NAME); 438MODULE_ALIAS("spi:wl1271"); 439