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/slab.h>
  27 #include <linux/crc7.h>
  28 #include <linux/spi/spi.h>
  29 #include <linux/spi/wl12xx.h>
  30
  31 #include "wl1251.h"
  32 #include "wl1251_reg.h"
  33 #include "wl1251_spi.h"
  34
  35 static irqreturn_t wl1251_irq(int irq, void *cookie)
  36 {
  37         struct wl1251 *wl;
  38
  39         wl1251_debug(DEBUG_IRQ, "IRQ");
  40
  41         wl = cookie;
  42
  43         ieee80211_queue_work(wl->hw, &wl->irq_work);
  44
  45         return IRQ_HANDLED;
  46 }
  47
  48 static struct spi_device *wl_to_spi(struct wl1251 *wl)
  49 {
  50         return wl->if_priv;
  51 }
  52
  53 static void wl1251_spi_reset(struct wl1251 *wl)
  54 {
  55         u8 *cmd;
  56         struct spi_transfer t;
  57         struct spi_message m;
  58
  59         cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
  60         if (!cmd) {
  61                 wl1251_error("could not allocate cmd for spi reset");
  62                 return;
  63         }
  64
  65         memset(&t, 0, sizeof(t));
  66         spi_message_init(&m);
  67
  68         memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
  69
  70         t.tx_buf = cmd;
  71         t.len = WSPI_INIT_CMD_LEN;
  72         spi_message_add_tail(&t, &m);
  73
  74         spi_sync(wl_to_spi(wl), &m);
  75
  76         wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
  77 }
  78
  79 static void wl1251_spi_wake(struct wl1251 *wl)
  80 {
  81         u8 crc[WSPI_INIT_CMD_CRC_LEN], *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                 wl1251_error("could not allocate cmd for spi init");
  88                 return;
  89         }
  90
  91         memset(crc, 0, sizeof(crc));
  92         memset(&t, 0, sizeof(t));
  93         spi_message_init(&m);
  94
  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
 133 static void wl1251_spi_reset_wake(struct wl1251 *wl)
 134 {
 135         wl1251_spi_reset(wl);
 136         wl1251_spi_wake(wl);
 137 }
 138
 139 static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf,
 140                             size_t len)
 141 {
 142         struct spi_transfer t[3];
 143         struct spi_message m;
 144         u8 *busy_buf;
 145         u32 *cmd;
 146
 147         cmd = &wl->buffer_cmd;
 148         busy_buf = wl->buffer_busyword;
 149
 150         *cmd = 0;
 151         *cmd |= WSPI_CMD_READ;
 152         *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
 153         *cmd |= addr & WSPI_CMD_BYTE_ADDR;
 154
 155         spi_message_init(&m);
 156         memset(t, 0, sizeof(t));
 157
 158         t[0].tx_buf = cmd;
 159         t[0].len = 4;
 160         spi_message_add_tail(&t[0], &m);
 161
 162         /* Busy and non busy words read */
 163         t[1].rx_buf = busy_buf;
 164         t[1].len = WL1251_BUSY_WORD_LEN;
 165         spi_message_add_tail(&t[1], &m);
 166
 167         t[2].rx_buf = buf;
 168         t[2].len = len;
 169         spi_message_add_tail(&t[2], &m);
 170
 171         spi_sync(wl_to_spi(wl), &m);
 172
 173         /* FIXME: check busy words */
 174
 175         wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
 176         wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
 177 }
 178
 179 static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf,
 180                              size_t len)
 181 {
 182         struct spi_transfer t[2];
 183         struct spi_message m;
 184         u32 *cmd;
 185
 186         cmd = &wl->buffer_cmd;
 187
 188         *cmd = 0;
 189         *cmd |= WSPI_CMD_WRITE;
 190         *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
 191         *cmd |= addr & WSPI_CMD_BYTE_ADDR;
 192
 193         spi_message_init(&m);
 194         memset(t, 0, sizeof(t));
 195
 196         t[0].tx_buf = cmd;
 197         t[0].len = sizeof(*cmd);
 198         spi_message_add_tail(&t[0], &m);
 199
 200         t[1].tx_buf = buf;
 201         t[1].len = len;
 202         spi_message_add_tail(&t[1], &m);
 203
 204         spi_sync(wl_to_spi(wl), &m);
 205
 206         wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
 207         wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
 208 }
 209
 210 static void wl1251_spi_enable_irq(struct wl1251 *wl)
 211 {
 212         return enable_irq(wl->irq);
 213 }
 214
 215 static void wl1251_spi_disable_irq(struct wl1251 *wl)
 216 {
 217         return disable_irq(wl->irq);
 218 }
 219
 220 static const struct wl1251_if_operations wl1251_spi_ops = {
 221         .read = wl1251_spi_read,
 222         .write = wl1251_spi_write,
 223         .reset = wl1251_spi_reset_wake,
 224         .enable_irq = wl1251_spi_enable_irq,
 225         .disable_irq = wl1251_spi_disable_irq,
 226 };
 227
 228 static int __devinit wl1251_spi_probe(struct spi_device *spi)
 229 {
 230         struct wl12xx_platform_data *pdata;
 231         struct ieee80211_hw *hw;
 232         struct wl1251 *wl;
 233         int ret;
 234
 235         pdata = spi->dev.platform_data;
 236         if (!pdata) {
 237                 wl1251_error("no platform data");
 238                 return -ENODEV;
 239         }
 240
 241         hw = wl1251_alloc_hw();
 242         if (IS_ERR(hw))
 243                 return PTR_ERR(hw);
 244
 245         wl = hw->priv;
 246
 247         SET_IEEE80211_DEV(hw, &spi->dev);
 248         dev_set_drvdata(&spi->dev, wl);
 249         wl->if_priv = spi;
 250         wl->if_ops = &wl1251_spi_ops;
 251
 252         /* This is the only SPI value that we need to set here, the rest
 253          * comes from the board-peripherals file */
 254         spi->bits_per_word = 32;
 255
 256         ret = spi_setup(spi);
 257         if (ret < 0) {
 258                 wl1251_error("spi_setup failed");
 259                 goto out_free;
 260         }
 261
 262         wl->set_power = pdata->set_power;
 263         if (!wl->set_power) {
 264                 wl1251_error("set power function missing in platform data");
 265                 return -ENODEV;
 266         }
 267
 268         wl->irq = spi->irq;
 269         if (wl->irq < 0) {
 270                 wl1251_error("irq missing in platform data");
 271                 return -ENODEV;
 272         }
 273
 274         wl->use_eeprom = pdata->use_eeprom;
 275
 276         ret = request_irq(wl->irq, wl1251_irq, 0, DRIVER_NAME, wl);
 277         if (ret < 0) {
 278                 wl1251_error("request_irq() failed: %d", ret);
 279                 goto out_free;
 280         }
 281
 282         set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
 283
 284         disable_irq(wl->irq);
 285
 286         ret = wl1251_init_ieee80211(wl);
 287         if (ret)
 288                 goto out_irq;
 289
 290         return 0;
 291
 292  out_irq:
 293         free_irq(wl->irq, wl);
 294
 295  out_free:
 296         ieee80211_free_hw(hw);
 297
 298         return ret;
 299 }
 300
 301 static int __devexit wl1251_spi_remove(struct spi_device *spi)
 302 {
 303         struct wl1251 *wl = dev_get_drvdata(&spi->dev);
 304
 305         free_irq(wl->irq, wl);
 306         wl1251_free_hw(wl);
 307
 308         return 0;
 309 }
 310
 311 static struct spi_driver wl1251_spi_driver = {
 312         .driver = {
 313                 .name           = "wl1251",
 314                 .bus            = &spi_bus_type,
 315                 .owner          = THIS_MODULE,
 316         },
 317
 318         .probe          = wl1251_spi_probe,
 319         .remove         = __devexit_p(wl1251_spi_remove),
 320 };
 321
 322 static int __init wl1251_spi_init(void)
 323 {
 324         int ret;
 325
 326         ret = spi_register_driver(&wl1251_spi_driver);
 327         if (ret < 0) {
 328                 wl1251_error("failed to register spi driver: %d", ret);
 329                 goto out;
 330         }
 331
 332 out:
 333         return ret;
 334 }
 335
 336 static void __exit wl1251_spi_exit(void)
 337 {
 338         spi_unregister_driver(&wl1251_spi_driver);
 339
 340         wl1251_notice("unloaded");
 341 }
 342
 343 module_init(wl1251_spi_init);
 344 module_exit(wl1251_spi_exit);
 345
 346 MODULE_LICENSE("GPL");
 347 MODULE_AUTHOR("Kalle Valo <kalle.valo@nokia.com>");