1/* 2 * This file is part of wl1251 3 * 4 * Copyright (C) 2008 Nokia Corporation 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * version 2 as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, but 11 * WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 18 * 02110-1301 USA 19 * 20 */ 21 22#include <linux/interrupt.h> 23#include <linux/irq.h> 24#include <linux/module.h> 25#include <linux/slab.h> 26#include <linux/crc7.h> 27#include <linux/spi/spi.h> 28#include <linux/wl12xx.h> 29 30#include "wl1251.h" 31#include "reg.h" 32#include "spi.h" 33 34static irqreturn_t wl1251_irq(int irq, void *cookie) 35{ 36 struct wl1251 *wl; 37 38 wl1251_debug(DEBUG_IRQ, "IRQ"); 39 40 wl = cookie; 41 42 ieee80211_queue_work(wl->hw, &wl->irq_work); 43 44 return IRQ_HANDLED; 45} 46 47static struct spi_device *wl_to_spi(struct wl1251 *wl) 48{ 49 return wl->if_priv; 50} 51 52static void wl1251_spi_reset(struct wl1251 *wl) 53{ 54 u8 *cmd; 55 struct spi_transfer t; 56 struct spi_message m; 57 58 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); 59 if (!cmd) { 60 wl1251_error("could not allocate cmd for spi reset"); 61 return; 62 } 63 64 memset(&t, 0, sizeof(t)); 65 spi_message_init(&m); 66 67 memset(cmd, 0xff, WSPI_INIT_CMD_LEN); 68 69 t.tx_buf = cmd; 70 t.len = WSPI_INIT_CMD_LEN; 71 spi_message_add_tail(&t, &m); 72 73 spi_sync(wl_to_spi(wl), &m); 74 75 wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN); 76} 77 78static void wl1251_spi_wake(struct wl1251 *wl) 79{ 80 u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd; 81 struct spi_transfer t; 82 struct spi_message m; 83 84 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); 85 if (!cmd) { 86 wl1251_error("could not allocate cmd for spi init"); 87 return; 88 } 89 90 memset(crc, 0, sizeof(crc)); 91 memset(&t, 0, sizeof(t)); 92 spi_message_init(&m); 93 94 /* 95 * Set WSPI_INIT_COMMAND 96 * the data is being send from the MSB to LSB 97 */ 98 cmd[2] = 0xff; 99 cmd[3] = 0xff; 100 cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX; 101 cmd[0] = 0; 102 cmd[7] = 0; 103 cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3; 104 cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN; 105 106 if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0) 107 cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY; 108 else 109 cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY; 110 111 cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS 112 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS; 113 114 crc[0] = cmd[1]; 115 crc[1] = cmd[0]; 116 crc[2] = cmd[7]; 117 crc[3] = cmd[6]; 118 crc[4] = cmd[5]; 119 120 cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1; 121 cmd[4] |= WSPI_INIT_CMD_END; 122 123 t.tx_buf = cmd; 124 t.len = WSPI_INIT_CMD_LEN; 125 spi_message_add_tail(&t, &m); 126 127 spi_sync(wl_to_spi(wl), &m); 128 129 wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN); 130} 131 132static void wl1251_spi_reset_wake(struct wl1251 *wl) 133{ 134 wl1251_spi_reset(wl); 135 wl1251_spi_wake(wl); 136} 137 138static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf, 139 size_t len) 140{ 141 struct spi_transfer t[3]; 142 struct spi_message m; 143 u8 *busy_buf; 144 u32 *cmd; 145 146 cmd = &wl->buffer_cmd; 147 busy_buf = wl->buffer_busyword; 148 149 *cmd = 0; 150 *cmd |= WSPI_CMD_READ; 151 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; 152 *cmd |= addr & WSPI_CMD_BYTE_ADDR; 153 154 spi_message_init(&m); 155 memset(t, 0, sizeof(t)); 156 157 t[0].tx_buf = cmd; 158 t[0].len = 4; 159 spi_message_add_tail(&t[0], &m); 160 161 /* Busy and non busy words read */ 162 t[1].rx_buf = busy_buf; 163 t[1].len = WL1251_BUSY_WORD_LEN; 164 spi_message_add_tail(&t[1], &m); 165 166 t[2].rx_buf = buf; 167 t[2].len = len; 168 spi_message_add_tail(&t[2], &m); 169 170 spi_sync(wl_to_spi(wl), &m); 171 172 /* FIXME: check busy words */ 173 174 wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd)); 175 wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len); 176} 177 178static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf, 179 size_t len) 180{ 181 struct spi_transfer t[2]; 182 struct spi_message m; 183 u32 *cmd; 184 185 cmd = &wl->buffer_cmd; 186 187 *cmd = 0; 188 *cmd |= WSPI_CMD_WRITE; 189 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; 190 *cmd |= addr & WSPI_CMD_BYTE_ADDR; 191 192 spi_message_init(&m); 193 memset(t, 0, sizeof(t)); 194 195 t[0].tx_buf = cmd; 196 t[0].len = sizeof(*cmd); 197 spi_message_add_tail(&t[0], &m); 198 199 t[1].tx_buf = buf; 200 t[1].len = len; 201 spi_message_add_tail(&t[1], &m); 202 203 spi_sync(wl_to_spi(wl), &m); 204 205 wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd)); 206 wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len); 207} 208 209static void wl1251_spi_enable_irq(struct wl1251 *wl) 210{ 211 return enable_irq(wl->irq); 212} 213 214static void wl1251_spi_disable_irq(struct wl1251 *wl) 215{ 216 return disable_irq(wl->irq); 217} 218 219static int wl1251_spi_set_power(struct wl1251 *wl, bool enable) 220{ 221 if (wl->set_power) 222 wl->set_power(enable); 223 224 return 0; 225} 226 227static const struct wl1251_if_operations wl1251_spi_ops = { 228 .read = wl1251_spi_read, 229 .write = wl1251_spi_write, 230 .reset = wl1251_spi_reset_wake, 231 .enable_irq = wl1251_spi_enable_irq, 232 .disable_irq = wl1251_spi_disable_irq, 233 .power = wl1251_spi_set_power, 234}; 235 236static int __devinit wl1251_spi_probe(struct spi_device *spi) 237{ 238 struct wl12xx_platform_data *pdata; 239 struct ieee80211_hw *hw; 240 struct wl1251 *wl; 241 int ret; 242 243 pdata = spi->dev.platform_data; 244 if (!pdata) { 245 wl1251_error("no platform data"); 246 return -ENODEV; 247 } 248 249 hw = wl1251_alloc_hw(); 250 if (IS_ERR(hw)) 251 return PTR_ERR(hw); 252 253 wl = hw->priv; 254 255 SET_IEEE80211_DEV(hw, &spi->dev); 256 dev_set_drvdata(&spi->dev, wl); 257 wl->if_priv = spi; 258 wl->if_ops = &wl1251_spi_ops; 259 260 /* This is the only SPI value that we need to set here, the rest 261 * comes from the board-peripherals file */ 262 spi->bits_per_word = 32; 263 264 ret = spi_setup(spi); 265 if (ret < 0) { 266 wl1251_error("spi_setup failed"); 267 goto out_free; 268 } 269 270 wl->set_power = pdata->set_power; 271 if (!wl->set_power) { 272 wl1251_error("set power function missing in platform data"); 273 return -ENODEV; 274 } 275 276 wl->irq = spi->irq; 277 if (wl->irq < 0) { 278 wl1251_error("irq missing in platform data"); 279 return -ENODEV; 280 } 281 282 wl->use_eeprom = pdata->use_eeprom; 283 284 ret = request_irq(wl->irq, wl1251_irq, 0, DRIVER_NAME, wl); 285 if (ret < 0) { 286 wl1251_error("request_irq() failed: %d", ret); 287 goto out_free; 288 } 289 290 irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING); 291 292 disable_irq(wl->irq); 293 294 ret = wl1251_init_ieee80211(wl); 295 if (ret) 296 goto out_irq; 297 298 return 0; 299 300 out_irq: 301 free_irq(wl->irq, wl); 302 303 out_free: 304 ieee80211_free_hw(hw); 305 306 return ret; 307} 308 309static int __devexit wl1251_spi_remove(struct spi_device *spi) 310{ 311 struct wl1251 *wl = dev_get_drvdata(&spi->dev); 312 313 free_irq(wl->irq, wl); 314 wl1251_free_hw(wl); 315 316 return 0; 317} 318 319static struct spi_driver wl1251_spi_driver = { 320 .driver = { 321 .name = DRIVER_NAME, 322 .owner = THIS_MODULE, 323 }, 324 325 .probe = wl1251_spi_probe, 326 .remove = __devexit_p(wl1251_spi_remove), 327}; 328 329static int __init wl1251_spi_init(void) 330{ 331 int ret; 332 333 ret = spi_register_driver(&wl1251_spi_driver); 334 if (ret < 0) { 335 wl1251_error("failed to register spi driver: %d", ret); 336 goto out; 337 } 338 339out: 340 return ret; 341} 342 343static void __exit wl1251_spi_exit(void) 344{ 345 spi_unregister_driver(&wl1251_spi_driver); 346 347 wl1251_notice("unloaded"); 348} 349 350module_init(wl1251_spi_init); 351module_exit(wl1251_spi_exit); 352 353MODULE_LICENSE("GPL"); 354MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>"); 355MODULE_ALIAS("spi:wl1251"); 356