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 /* Set WSPI_INIT_COMMAND 97 * the data is being send from the MSB to LSB 98 */ 99 cmd[2] = 0xff; 100 cmd[3] = 0xff; 101 cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX; 102 cmd[0] = 0; 103 cmd[7] = 0; 104 cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3; 105 cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN; 106 107 if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0) 108 cmd[5] |= WSPI_INIT_CMD_DIS_FIXEDBUSY; 109 else 110 cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY; 111 112 cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS 113 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS; 114 115 crc[0] = cmd[1]; 116 crc[1] = cmd[0]; 117 crc[2] = cmd[7]; 118 crc[3] = cmd[6]; 119 crc[4] = cmd[5]; 120 121 cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1; 122 cmd[4] |= WSPI_INIT_CMD_END; 123 124 t.tx_buf = cmd; 125 t.len = WSPI_INIT_CMD_LEN; 126 spi_message_add_tail(&t, &m); 127 128 spi_sync(wl_to_spi(wl), &m); 129 130 wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN); 131 132 kfree(cmd); 133 } 134 135 static void wl1251_spi_reset_wake(struct wl1251 *wl) 136 { 137 wl1251_spi_reset(wl); 138 wl1251_spi_wake(wl); 139 } 140 141 static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf, 142 size_t len) 143 { 144 struct spi_transfer t[3]; 145 struct spi_message m; 146 u8 *busy_buf; 147 u32 *cmd; 148 149 cmd = &wl->buffer_cmd; 150 busy_buf = wl->buffer_busyword; 151 152 *cmd = 0; 153 *cmd |= WSPI_CMD_READ; 154 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; 155 *cmd |= addr & WSPI_CMD_BYTE_ADDR; 156 157 spi_message_init(&m); 158 memset(t, 0, sizeof(t)); 159 160 t[0].tx_buf = cmd; 161 t[0].len = 4; 162 spi_message_add_tail(&t[0], &m); 163 164 /* Busy and non busy words read */ 165 t[1].rx_buf = busy_buf; 166 t[1].len = WL1251_BUSY_WORD_LEN; 167 spi_message_add_tail(&t[1], &m); 168 169 t[2].rx_buf = buf; 170 t[2].len = len; 171 spi_message_add_tail(&t[2], &m); 172 173 spi_sync(wl_to_spi(wl), &m); 174 175 /* FIXME: check busy words */ 176 177 wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd)); 178 wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len); 179 } 180 181 static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf, 182 size_t len) 183 { 184 struct spi_transfer t[2]; 185 struct spi_message m; 186 u32 *cmd; 187 188 cmd = &wl->buffer_cmd; 189 190 *cmd = 0; 191 *cmd |= WSPI_CMD_WRITE; 192 *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; 193 *cmd |= addr & WSPI_CMD_BYTE_ADDR; 194 195 spi_message_init(&m); 196 memset(t, 0, sizeof(t)); 197 198 t[0].tx_buf = cmd; 199 t[0].len = sizeof(*cmd); 200 spi_message_add_tail(&t[0], &m); 201 202 t[1].tx_buf = buf; 203 t[1].len = len; 204 spi_message_add_tail(&t[1], &m); 205 206 spi_sync(wl_to_spi(wl), &m); 207 208 wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd)); 209 wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len); 210 } 211 212 static void wl1251_spi_enable_irq(struct wl1251 *wl) 213 { 214 return enable_irq(wl->irq); 215 } 216 217 static void wl1251_spi_disable_irq(struct wl1251 *wl) 218 { 219 return disable_irq(wl->irq); 220 } 221 222 static int wl1251_spi_set_power(struct wl1251 *wl, bool enable) 223 { 224 if (wl->set_power) 225 wl->set_power(enable); 226 227 return 0; 228 } 229 230 static const struct wl1251_if_operations wl1251_spi_ops = { 231 .read = wl1251_spi_read, 232 .write = wl1251_spi_write, 233 .reset = wl1251_spi_reset_wake, 234 .enable_irq = wl1251_spi_enable_irq, 235 .disable_irq = wl1251_spi_disable_irq, 236 .power = wl1251_spi_set_power, 237 }; 238 239 static int wl1251_spi_probe(struct spi_device *spi) 240 { 241 struct wl12xx_platform_data *pdata; 242 struct ieee80211_hw *hw; 243 struct wl1251 *wl; 244 int ret; 245 246 pdata = spi->dev.platform_data; 247 if (!pdata) { 248 wl1251_error("no platform data"); 249 return -ENODEV; 250 } 251 252 hw = wl1251_alloc_hw(); 253 if (IS_ERR(hw)) 254 return PTR_ERR(hw); 255 256 wl = hw->priv; 257 258 SET_IEEE80211_DEV(hw, &spi->dev); 259 spi_set_drvdata(spi, wl); 260 wl->if_priv = spi; 261 wl->if_ops = &wl1251_spi_ops; 262 263 /* This is the only SPI value that we need to set here, the rest 264 * comes from the board-peripherals file 265 */ 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 = spi_get_drvdata(spi); 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 module_spi_driver(wl1251_spi_driver); 333 334 MODULE_LICENSE("GPL"); 335 MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>"); 336 MODULE_ALIAS("spi:wl1251"); 337