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 #include <linux/spi/spi.h>
  28 #include <linux/spi/wl12xx.h>
  29
  30 #include "wl1251.h"
  31 #include "wl1251_reg.h"
  32 #include "wl1251_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
  78 static 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
 132 static void wl1251_spi_reset_wake(struct wl1251 *wl)
 133 {
 134         wl1251_spi_reset(wl);
 135         wl1251_spi_wake(wl);
 136 }
 137
 138 static 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
 178 static 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
 209 static void wl1251_spi_enable_irq(struct wl1251 *wl)
 210 {
 211         return enable_irq(wl->irq);
 212 }
 213
 214 static void wl1251_spi_disable_irq(struct wl1251 *wl)
 215 {
 216         return disable_irq(wl->irq);
 217 }
 218
 219 static const struct wl1251_if_operations wl1251_spi_ops = {
 220         .read = wl1251_spi_read,
 221         .write = wl1251_spi_write,
 222         .reset = wl1251_spi_reset_wake,
 223         .enable_irq = wl1251_spi_enable_irq,
 224         .disable_irq = wl1251_spi_disable_irq,
 225 };
 226
 227 static int __devinit wl1251_spi_probe(struct spi_device *spi)
 228 {
 229         struct wl12xx_platform_data *pdata;
 230         struct ieee80211_hw *hw;
 231         struct wl1251 *wl;
 232         int ret;
 233
 234         pdata = spi->dev.platform_data;
 235         if (!pdata) {
 236                 wl1251_error("no platform data");
 237                 return -ENODEV;
 238         }
 239
 240         hw = wl1251_alloc_hw();
 241         if (IS_ERR(hw))
 242                 return PTR_ERR(hw);
 243
 244         wl = hw->priv;
 245
 246         SET_IEEE80211_DEV(hw, &spi->dev);
 247         dev_set_drvdata(&spi->dev, wl);
 248         wl->if_priv = spi;
 249         wl->if_ops = &wl1251_spi_ops;
 250
 251         /* This is the only SPI value that we need to set here, the rest
 252          * comes from the board-peripherals file */
 253         spi->bits_per_word = 32;
 254
 255         ret = spi_setup(spi);
 256         if (ret < 0) {
 257                 wl1251_error("spi_setup failed");
 258                 goto out_free;
 259         }
 260
 261         wl->set_power = pdata->set_power;
 262         if (!wl->set_power) {
 263                 wl1251_error("set power function missing in platform data");
 264                 return -ENODEV;
 265         }
 266
 267         wl->irq = spi->irq;
 268         if (wl->irq < 0) {
 269                 wl1251_error("irq missing in platform data");
 270                 return -ENODEV;
 271         }
 272
 273         ret = request_irq(wl->irq, wl1251_irq, 0, DRIVER_NAME, wl);
 274         if (ret < 0) {
 275                 wl1251_error("request_irq() failed: %d", ret);
 276                 goto out_free;
 277         }
 278
 279         set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
 280
 281         disable_irq(wl->irq);
 282
 283         ret = wl1251_init_ieee80211(wl);
 284         if (ret)
 285                 goto out_irq;
 286
 287         return 0;
 288
 289  out_irq:
 290         free_irq(wl->irq, wl);
 291
 292  out_free:
 293         ieee80211_free_hw(hw);
 294
 295         return ret;
 296 }
 297
 298 static int __devexit wl1251_spi_remove(struct spi_device *spi)
 299 {
 300         struct wl1251 *wl = dev_get_drvdata(&spi->dev);
 301
 302         free_irq(wl->irq, wl);
 303         wl1251_free_hw(wl);
 304
 305         return 0;
 306 }
 307
 308 static struct spi_driver wl1251_spi_driver = {
 309         .driver = {
 310                 .name           = "wl12xx",
 311                 .bus            = &spi_bus_type,
 312                 .owner          = THIS_MODULE,
 313         },
 314
 315         .probe          = wl1251_spi_probe,
 316         .remove         = __devexit_p(wl1251_spi_remove),
 317 };
 318
 319 static int __init wl1251_spi_init(void)
 320 {
 321         int ret;
 322
 323         ret = spi_register_driver(&wl1251_spi_driver);
 324         if (ret < 0) {
 325                 wl1251_error("failed to register spi driver: %d", ret);
 326                 goto out;
 327         }
 328
 329 out:
 330         return ret;
 331 }
 332
 333 static void __exit wl1251_spi_exit(void)
 334 {
 335         spi_unregister_driver(&wl1251_spi_driver);
 336
 337         wl1251_notice("unloaded");
 338 }
 339
 340 module_init(wl1251_spi_init);
 341 module_exit(wl1251_spi_exit);
 342
 343 MODULE_LICENSE("GPL");
 344 MODULE_AUTHOR("Kalle Valo <kalle.valo@nokia.com>");