drivers/net/wireless/wl12xx/wl1251_spi.c

   1 /*
   2  * This file is part of wl1251
   3  *
   4  * Copyright (C) 2008 Nokia Corporation
   5  *
   6  * Contact: Kalle Valo <kalle.valo@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/irq.h>
  25 #include <linux/module.h>
  26 #include <linux/crc7.h>
  27 #if (LINUX_VERSION_CODE == KERNEL_VERSION(2,6,28))
  28 #include <linux/device.h>
  29 #endif
  30 #include <linux/spi/spi.h>
  31 #include <linux/spi/wl12xx.h>
  32
  33 #include "wl1251.h"
  34 #include "wl1251_reg.h"
  35 #include "wl1251_spi.h"
  36
  37 static irqreturn_t wl1251_irq(int irq, void *cookie)
  38 {
  39         struct wl1251 *wl;
  40
  41         wl1251_debug(DEBUG_IRQ, "IRQ");
  42
  43         wl = cookie;
  44
  45         ieee80211_queue_work(wl->hw, &wl->irq_work);
  46
  47         return IRQ_HANDLED;
  48 }
  49
  50 static struct spi_device *wl_to_spi(struct wl1251 *wl)
  51 {
  52         return wl->if_priv;
  53 }
  54
  55 static void wl1251_spi_reset(struct wl1251 *wl)
  56 {
  57         u8 *cmd;
  58         struct spi_transfer t;
  59         struct spi_message m;
  60
  61         cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
  62         if (!cmd) {
  63                 wl1251_error("could not allocate cmd for spi reset");
  64                 return;
  65         }
  66
  67         memset(&t, 0, sizeof(t));
  68         spi_message_init(&m);
  69
  70         memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
  71
  72         t.tx_buf = cmd;
  73         t.len = WSPI_INIT_CMD_LEN;
  74         spi_message_add_tail(&t, &m);
  75
  76         spi_sync(wl_to_spi(wl), &m);
  77
  78         wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
  79 }
  80
  81 static void wl1251_spi_wake(struct wl1251 *wl)
  82 {
  83         u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd;
  84         struct spi_transfer t;
  85         struct spi_message m;
  86
  87         cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
  88         if (!cmd) {
  89                 wl1251_error("could not allocate cmd for spi init");
  90                 return;
  91         }
  92
  93         memset(crc, 0, sizeof(crc));
  94         memset(&t, 0, sizeof(t));
  95         spi_message_init(&m);
  96
  97         /*
  98          * Set WSPI_INIT_COMMAND
  99          * the data is being send from the MSB to LSB
 100          */
 101         cmd[2] = 0xff;
 102         cmd[3] = 0xff;
 103         cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
 104         cmd[0] = 0;
 105         cmd[7] = 0;
 106         cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
 107         cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
 108
 109         if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
 110                 cmd[5] |=  WSPI_INIT_CMD_DIS_FIXEDBUSY;
 111         else
 112                 cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
 113
 114         cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
 115                 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
 116
 117         crc[0] = cmd[1];
 118         crc[1] = cmd[0];
 119         crc[2] = cmd[7];
 120         crc[3] = cmd[6];
 121         crc[4] = cmd[5];
 122
 123         cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1;
 124         cmd[4] |= WSPI_INIT_CMD_END;
 125
 126         t.tx_buf = cmd;
 127         t.len = WSPI_INIT_CMD_LEN;
 128         spi_message_add_tail(&t, &m);
 129
 130         spi_sync(wl_to_spi(wl), &m);
 131
 132         wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
 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 const struct wl1251_if_operations wl1251_spi_ops = {
 223         .read = wl1251_spi_read,
 224         .write = wl1251_spi_write,
 225         .reset = wl1251_spi_reset_wake,
 226         .enable_irq = wl1251_spi_enable_irq,
 227         .disable_irq = wl1251_spi_disable_irq,
 228 };
 229
 230 static int __devinit wl1251_spi_probe(struct spi_device *spi)
 231 {
 232         struct wl12xx_platform_data *pdata;
 233         struct ieee80211_hw *hw;
 234         struct wl1251 *wl;
 235         int ret;
 236
 237         pdata = spi->dev.platform_data;
 238         if (!pdata) {
 239                 wl1251_error("no platform data");
 240                 return -ENODEV;
 241         }
 242
 243         hw = wl1251_alloc_hw();
 244         if (IS_ERR(hw))
 245                 return PTR_ERR(hw);
 246
 247         wl = hw->priv;
 248
 249         SET_IEEE80211_DEV(hw, &spi->dev);
 250         dev_set_drvdata(&spi->dev, wl);
 251         wl->if_priv = spi;
 252         wl->if_ops = &wl1251_spi_ops;
 253
 254         /* This is the only SPI value that we need to set here, the rest
 255          * comes from the board-peripherals file */
 256         spi->bits_per_word = 32;
 257
 258         ret = spi_setup(spi);
 259         if (ret < 0) {
 260                 wl1251_error("spi_setup failed");
 261                 goto out_free;
 262         }
 263
 264         wl->set_power = pdata->set_power;
 265         if (!wl->set_power) {
 266                 wl1251_error("set power function missing in platform data");
 267                 return -ENODEV;
 268         }
 269
 270         wl->irq = spi->irq;
 271         if (wl->irq < 0) {
 272                 wl1251_error("irq missing in platform data");
 273                 return -ENODEV;
 274         }
 275
 276         wl->use_eeprom = pdata->use_eeprom;
 277
 278         ret = request_irq(wl->irq, wl1251_irq, 0, DRIVER_NAME, wl);
 279         if (ret < 0) {
 280                 wl1251_error("request_irq() failed: %d", ret);
 281                 goto out_free;
 282         }
 283
 284         set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
 285
 286         disable_irq(wl->irq);
 287
 288         ret = wl1251_init_ieee80211(wl);
 289         if (ret)
 290                 goto out_irq;
 291
 292         return 0;
 293
 294  out_irq:
 295         free_irq(wl->irq, wl);
 296
 297  out_free:
 298         ieee80211_free_hw(hw);
 299
 300         return ret;
 301 }
 302
 303 static int __devexit wl1251_spi_remove(struct spi_device *spi)
 304 {
 305         struct wl1251 *wl = dev_get_drvdata(&spi->dev);
 306
 307         free_irq(wl->irq, wl);
 308         wl1251_free_hw(wl);
 309
 310         return 0;
 311 }
 312
 313 static struct spi_driver wl1251_spi_driver = {
 314         .driver = {
 315                 .name           = "wl1251",
 316                 .bus            = &spi_bus_type,
 317                 .owner          = THIS_MODULE,
 318         },
 319
 320         .probe          = wl1251_spi_probe,
 321         .remove         = __devexit_p(wl1251_spi_remove),
 322 };
 323
 324 static int __init wl1251_spi_init(void)
 325 {
 326         int ret;
 327
 328         ret = spi_register_driver(&wl1251_spi_driver);
 329         if (ret < 0) {
 330                 wl1251_error("failed to register spi driver: %d", ret);
 331                 goto out;
 332         }
 333
 334 out:
 335         return ret;
 336 }
 337
 338 static void __exit wl1251_spi_exit(void)
 339 {
 340         spi_unregister_driver(&wl1251_spi_driver);
 341
 342         wl1251_notice("unloaded");
 343 }
 344
 345 module_init(wl1251_spi_init);
 346 module_exit(wl1251_spi_exit);
 347
 348 MODULE_LICENSE("GPL");
 349 MODULE_AUTHOR("Kalle Valo <kalle.valo@nokia.com>");