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 34 static 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 47 static struct spi_device *wl_to_spi(struct wl1251 *wl) 48 { 49 return wl->if_priv; 50 } 51 52 static 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 kfree(cmd); 78 } 79 80 static void wl1251_spi_wake(struct wl1251 *wl) 81 { 82 u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd; 83 struct spi_transfer t; 84 struct spi_message m; 85 86 cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); 87 if (!cmd) { 88 wl1251_error("could not allocate cmd for spi init"); 89 return; 90 } 91 92 memset(crc, 0, sizeof(crc)); 93 memset(&t, 0, sizeof(t)); 94 spi_message_init(&m); 95 96 /* 97 * Set WSPI_INIT_COMMAND 98 * the data is being send from the MSB to LSB 99 */ 100 cmd[2] = 0xff; 101 cmd[3] = 0xff; 102 cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX; 103 cmd[0] = 0; 104 cmd[7] = 0; 105 cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3; 106 cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN; 107 108 if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0) 109 cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY; 110 else 111 cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY; 112 113 cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS 114 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS; 115 116 crc[0] = cmd[1]; 117 crc[1] = cmd[0]; 118 crc[2] = cmd[7]; 119 crc[3] = cmd[6]; 120 crc[4] = cmd[5]; 121 122 cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1; 123 cmd[4] |= WSPI_INIT_CMD_END; 124 125 t.tx_buf = cmd; 126 t.len = WSPI_INIT_CMD_LEN; 127 spi_message_add_tail(&t, &m); 128 129 spi_sync(wl_to_spi(wl), &m); 130 131 wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN); 132 133 kfree(cmd); 134 } 135 136 static void wl1251_spi_reset_wake(struct wl1251 *wl) 137 { 138 wl1251_spi_reset(wl); 139 wl1251_spi_wake(wl); 140 } 141 142 static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf, 143 size_t len) 144 { 145 struct spi_transfer t[3]; 146 struct spi_message m; 147 u8 *busy_buf; 148 u32 *cmd; 149 150 cmd = &wl->buffer_cmd; 151 busy_buf = wl->buffer_busyword; 152 153 *cmd = 0; 154 *cmd |= WSPI_CMD_READ; 155 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; 156 *cmd |= addr & WSPI_CMD_BYTE_ADDR; 157 158 spi_message_init(&m); 159 memset(t, 0, sizeof(t)); 160 161 t[0].tx_buf = cmd; 162 t[0].len = 4; 163 spi_message_add_tail(&t[0], &m); 164 165 /* Busy and non busy words read */ 166 t[1].rx_buf = busy_buf; 167 t[1].len = WL1251_BUSY_WORD_LEN; 168 spi_message_add_tail(&t[1], &m); 169 170 t[2].rx_buf = buf; 171 t[2].len = len; 172 spi_message_add_tail(&t[2], &m); 173 174 spi_sync(wl_to_spi(wl), &m); 175 176 /* FIXME: check busy words */ 177 178 wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd)); 179 wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len); 180 } 181 182 static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf, 183 size_t len) 184 { 185 struct spi_transfer t[2]; 186 struct spi_message m; 187 u32 *cmd; 188 189 cmd = &wl->buffer_cmd; 190 191 *cmd = 0; 192 *cmd |= WSPI_CMD_WRITE; 193 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; 194 *cmd |= addr & WSPI_CMD_BYTE_ADDR; 195 196 spi_message_init(&m); 197 memset(t, 0, sizeof(t)); 198 199 t[0].tx_buf = cmd; 200 t[0].len = sizeof(*cmd); 201 spi_message_add_tail(&t[0], &m); 202 203 t[1].tx_buf = buf; 204 t[1].len = len; 205 spi_message_add_tail(&t[1], &m); 206 207 spi_sync(wl_to_spi(wl), &m); 208 209 wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd)); 210 wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len); 211 } 212 213 static void wl1251_spi_enable_irq(struct wl1251 *wl) 214 { 215 return enable_irq(wl->irq); 216 } 217 218 static void wl1251_spi_disable_irq(struct wl1251 *wl) 219 { 220 return disable_irq(wl->irq); 221 } 222 223 static int wl1251_spi_set_power(struct wl1251 *wl, bool enable) 224 { 225 if (wl->set_power) 226 wl->set_power(enable); 227 228 return 0; 229 } 230 231 static const struct wl1251_if_operations wl1251_spi_ops = { 232 .read = wl1251_spi_read, 233 .write = wl1251_spi_write, 234 .reset = wl1251_spi_reset_wake, 235 .enable_irq = wl1251_spi_enable_irq, 236 .disable_irq = wl1251_spi_disable_irq, 237 .power = wl1251_spi_set_power, 238 }; 239 240 static int wl1251_spi_probe(struct spi_device *spi) 241 { 242 struct wl12xx_platform_data *pdata; 243 struct ieee80211_hw *hw; 244 struct wl1251 *wl; 245 int ret; 246 247 pdata = spi->dev.platform_data; 248 if (!pdata) { 249 wl1251_error("no platform data"); 250 return -ENODEV; 251 } 252 253 hw = wl1251_alloc_hw(); 254 if (IS_ERR(hw)) 255 return PTR_ERR(hw); 256 257 wl = hw->priv; 258 259 SET_IEEE80211_DEV(hw, &spi->dev); 260 dev_set_drvdata(&spi->dev, wl); 261 wl->if_priv = spi; 262 wl->if_ops = &wl1251_spi_ops; 263 264 /* This is the only SPI value that we need to set here, the rest 265 * comes from the board-peripherals file */ 266 spi->bits_per_word = 32; 267 268 ret = spi_setup(spi); 269 if (ret < 0) { 270 wl1251_error("spi_setup failed"); 271 goto out_free; 272 } 273 274 wl->set_power = pdata->set_power; 275 if (!wl->set_power) { 276 wl1251_error("set power function missing in platform data"); 277 return -ENODEV; 278 } 279 280 wl->irq = spi->irq; 281 if (wl->irq < 0) { 282 wl1251_error("irq missing in platform data"); 283 return -ENODEV; 284 } 285 286 wl->use_eeprom = pdata->use_eeprom; 287 288 irq_set_status_flags(wl->irq, IRQ_NOAUTOEN); 289 ret = request_irq(wl->irq, wl1251_irq, 0, DRIVER_NAME, wl); 290 if (ret < 0) { 291 wl1251_error("request_irq() failed: %d", ret); 292 goto out_free; 293 } 294 295 irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING); 296 297 ret = wl1251_init_ieee80211(wl); 298 if (ret) 299 goto out_irq; 300 301 return 0; 302 303 out_irq: 304 free_irq(wl->irq, wl); 305 306 out_free: 307 ieee80211_free_hw(hw); 308 309 return ret; 310 } 311 312 static int wl1251_spi_remove(struct spi_device *spi) 313 { 314 struct wl1251 *wl = dev_get_drvdata(&spi->dev); 315 316 free_irq(wl->irq, wl); 317 wl1251_free_hw(wl); 318 319 return 0; 320 } 321 322 static struct spi_driver wl1251_spi_driver = { 323 .driver = { 324 .name = DRIVER_NAME, 325 .owner = THIS_MODULE, 326 }, 327 328 .probe = wl1251_spi_probe, 329 .remove = wl1251_spi_remove, 330 }; 331 332 static int __init wl1251_spi_init(void) 333 { 334 int ret; 335 336 ret = spi_register_driver(&wl1251_spi_driver); 337 if (ret < 0) { 338 wl1251_error("failed to register spi driver: %d", ret); 339 goto out; 340 } 341 342 out: 343 return ret; 344 } 345 346 static void __exit wl1251_spi_exit(void) 347 { 348 spi_unregister_driver(&wl1251_spi_driver); 349 350 wl1251_notice("unloaded"); 351 } 352 353 module_init(wl1251_spi_init); 354 module_exit(wl1251_spi_exit); 355 356 MODULE_LICENSE("GPL"); 357 MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>"); 358 MODULE_ALIAS("spi:wl1251"); 359