drivers/net/wireless/wl1251/spi.c

   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/irq.h>
  23 #include <linux/module.h>
  24 #include <linux/slab.h>
  25 #include <linux/crc7.h>
  26 #include <linux/spi/spi.h>
  27 #include <linux/wl12xx.h>
  28
  29 #include "wl1251.h"
  30 #include "reg.h"
  31 #include "spi.h"
  32
  33 static irqreturn_t wl1251_irq(int irq, void *cookie)
  34 {
  35         struct wl1251 *wl;
  36
  37         wl1251_debug(DEBUG_IRQ, "IRQ");
  38
  39         wl = cookie;
  40
  41         ieee80211_queue_work(wl->hw, &wl->irq_work);
  42
  43         return IRQ_HANDLED;
  44 }
  45
  46 static struct spi_device *wl_to_spi(struct wl1251 *wl)
  47 {
  48         return wl->if_priv;
  49 }
  50
  51 static void wl1251_spi_reset(struct wl1251 *wl)
  52 {
  53         u8 *cmd;
  54         struct spi_transfer t;
  55         struct spi_message m;
  56
  57         cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
  58         if (!cmd) {
  59                 wl1251_error("could not allocate cmd for spi reset");
  60                 return;
  61         }
  62
  63         memset(&t, 0, sizeof(t));
  64         spi_message_init(&m);
  65
  66         memset(cmd, 0xff, WSPI_INIT_CMD_LEN);
  67
  68         t.tx_buf = cmd;
  69         t.len = WSPI_INIT_CMD_LEN;
  70         spi_message_add_tail(&t, &m);
  71
  72         spi_sync(wl_to_spi(wl), &m);
  73
  74         wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN);
  75 }
  76
  77 static void wl1251_spi_wake(struct wl1251 *wl)
  78 {
  79         u8 crc[WSPI_INIT_CMD_CRC_LEN], *cmd;
  80         struct spi_transfer t;
  81         struct spi_message m;
  82
  83         cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL);
  84         if (!cmd) {
  85                 wl1251_error("could not allocate cmd for spi init");
  86                 return;
  87         }
  88
  89         memset(crc, 0, sizeof(crc));
  90         memset(&t, 0, sizeof(t));
  91         spi_message_init(&m);
  92
  93         /*
  94          * Set WSPI_INIT_COMMAND
  95          * the data is being send from the MSB to LSB
  96          */
  97         cmd[2] = 0xff;
  98         cmd[3] = 0xff;
  99         cmd[1] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX;
 100         cmd[0] = 0;
 101         cmd[7] = 0;
 102         cmd[6] |= HW_ACCESS_WSPI_INIT_CMD_MASK << 3;
 103         cmd[6] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN;
 104
 105         if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0)
 106                 cmd[5] |=  WSPI_INIT_CMD_DIS_FIXEDBUSY;
 107         else
 108                 cmd[5] |= WSPI_INIT_CMD_EN_FIXEDBUSY;
 109
 110         cmd[5] |= WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS
 111                 | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS;
 112
 113         crc[0] = cmd[1];
 114         crc[1] = cmd[0];
 115         crc[2] = cmd[7];
 116         crc[3] = cmd[6];
 117         crc[4] = cmd[5];
 118
 119         cmd[4] |= crc7(0, crc, WSPI_INIT_CMD_CRC_LEN) << 1;
 120         cmd[4] |= WSPI_INIT_CMD_END;
 121
 122         t.tx_buf = cmd;
 123         t.len = WSPI_INIT_CMD_LEN;
 124         spi_message_add_tail(&t, &m);
 125
 126         spi_sync(wl_to_spi(wl), &m);
 127
 128         wl1251_dump(DEBUG_SPI, "spi init -> ", cmd, WSPI_INIT_CMD_LEN);
 129 }
 130
 131 static void wl1251_spi_reset_wake(struct wl1251 *wl)
 132 {
 133         wl1251_spi_reset(wl);
 134         wl1251_spi_wake(wl);
 135 }
 136
 137 static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf,
 138                             size_t len)
 139 {
 140         struct spi_transfer t[3];
 141         struct spi_message m;
 142         u8 *busy_buf;
 143         u32 *cmd;
 144
 145         cmd = &wl->buffer_cmd;
 146         busy_buf = wl->buffer_busyword;
 147
 148         *cmd = 0;
 149         *cmd |= WSPI_CMD_READ;
 150         *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
 151         *cmd |= addr & WSPI_CMD_BYTE_ADDR;
 152
 153         spi_message_init(&m);
 154         memset(t, 0, sizeof(t));
 155
 156         t[0].tx_buf = cmd;
 157         t[0].len = 4;
 158         spi_message_add_tail(&t[0], &m);
 159
 160         /* Busy and non busy words read */
 161         t[1].rx_buf = busy_buf;
 162         t[1].len = WL1251_BUSY_WORD_LEN;
 163         spi_message_add_tail(&t[1], &m);
 164
 165         t[2].rx_buf = buf;
 166         t[2].len = len;
 167         spi_message_add_tail(&t[2], &m);
 168
 169         spi_sync(wl_to_spi(wl), &m);
 170
 171         /* FIXME: check busy words */
 172
 173         wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd));
 174         wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len);
 175 }
 176
 177 static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf,
 178                              size_t len)
 179 {
 180         struct spi_transfer t[2];
 181         struct spi_message m;
 182         u32 *cmd;
 183
 184         cmd = &wl->buffer_cmd;
 185
 186         *cmd = 0;
 187         *cmd |= WSPI_CMD_WRITE;
 188         *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH;
 189         *cmd |= addr & WSPI_CMD_BYTE_ADDR;
 190
 191         spi_message_init(&m);
 192         memset(t, 0, sizeof(t));
 193
 194         t[0].tx_buf = cmd;
 195         t[0].len = sizeof(*cmd);
 196         spi_message_add_tail(&t[0], &m);
 197
 198         t[1].tx_buf = buf;
 199         t[1].len = len;
 200         spi_message_add_tail(&t[1], &m);
 201
 202         spi_sync(wl_to_spi(wl), &m);
 203
 204         wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd));
 205         wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len);
 206 }
 207
 208 static void wl1251_spi_enable_irq(struct wl1251 *wl)
 209 {
 210         return enable_irq(wl->irq);
 211 }
 212
 213 static void wl1251_spi_disable_irq(struct wl1251 *wl)
 214 {
 215         return disable_irq(wl->irq);
 216 }
 217
 218 static int wl1251_spi_set_power(struct wl1251 *wl, bool enable)
 219 {
 220         if (wl->set_power)
 221                 wl->set_power(enable);
 222
 223         return 0;
 224 }
 225
 226 static const struct wl1251_if_operations wl1251_spi_ops = {
 227         .read = wl1251_spi_read,
 228         .write = wl1251_spi_write,
 229         .reset = wl1251_spi_reset_wake,
 230         .enable_irq = wl1251_spi_enable_irq,
 231         .disable_irq = wl1251_spi_disable_irq,
 232         .power = wl1251_spi_set_power,
 233 };
 234
 235 static int __devinit wl1251_spi_probe(struct spi_device *spi)
 236 {
 237         struct wl12xx_platform_data *pdata;
 238         struct ieee80211_hw *hw;
 239         struct wl1251 *wl;
 240         int ret;
 241
 242         pdata = spi->dev.platform_data;
 243         if (!pdata) {
 244                 wl1251_error("no platform data");
 245                 return -ENODEV;
 246         }
 247
 248         hw = wl1251_alloc_hw();
 249         if (IS_ERR(hw))
 250                 return PTR_ERR(hw);
 251
 252         wl = hw->priv;
 253
 254         SET_IEEE80211_DEV(hw, &spi->dev);
 255         dev_set_drvdata(&spi->dev, wl);
 256         wl->if_priv = spi;
 257         wl->if_ops = &wl1251_spi_ops;
 258
 259         /* This is the only SPI value that we need to set here, the rest
 260          * comes from the board-peripherals file */
 261         spi->bits_per_word = 32;
 262
 263         ret = spi_setup(spi);
 264         if (ret < 0) {
 265                 wl1251_error("spi_setup failed");
 266                 goto out_free;
 267         }
 268
 269         wl->set_power = pdata->set_power;
 270         if (!wl->set_power) {
 271                 wl1251_error("set power function missing in platform data");
 272                 return -ENODEV;
 273         }
 274
 275         wl->irq = spi->irq;
 276         if (wl->irq < 0) {
 277                 wl1251_error("irq missing in platform data");
 278                 return -ENODEV;
 279         }
 280
 281         wl->use_eeprom = pdata->use_eeprom;
 282
 283         ret = request_irq(wl->irq, wl1251_irq, 0, DRIVER_NAME, wl);
 284         if (ret < 0) {
 285                 wl1251_error("request_irq() failed: %d", ret);
 286                 goto out_free;
 287         }
 288
 289         irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING);
 290
 291         disable_irq(wl->irq);
 292
 293         ret = wl1251_init_ieee80211(wl);
 294         if (ret)
 295                 goto out_irq;
 296
 297         return 0;
 298
 299  out_irq:
 300         free_irq(wl->irq, wl);
 301
 302  out_free:
 303         ieee80211_free_hw(hw);
 304
 305         return ret;
 306 }
 307
 308 static int __devexit wl1251_spi_remove(struct spi_device *spi)
 309 {
 310         struct wl1251 *wl = dev_get_drvdata(&spi->dev);
 311
 312         free_irq(wl->irq, wl);
 313         wl1251_free_hw(wl);
 314
 315         return 0;
 316 }
 317
 318 static struct spi_driver wl1251_spi_driver = {
 319         .driver = {
 320                 .name           = DRIVER_NAME,
 321                 .bus            = &spi_bus_type,
 322                 .owner          = THIS_MODULE,
 323         },
 324
 325         .probe          = wl1251_spi_probe,
 326         .remove         = __devexit_p(wl1251_spi_remove),
 327 };
 328
 329 static int __init wl1251_spi_init(void)
 330 {
 331         int ret;
 332
 333         ret = spi_register_driver(&wl1251_spi_driver);
 334         if (ret < 0) {
 335                 wl1251_error("failed to register spi driver: %d", ret);
 336                 goto out;
 337         }
 338
 339 out:
 340         return ret;
 341 }
 342
 343 static void __exit wl1251_spi_exit(void)
 344 {
 345         spi_unregister_driver(&wl1251_spi_driver);
 346
 347         wl1251_notice("unloaded");
 348 }
 349
 350 module_init(wl1251_spi_init);
 351 module_exit(wl1251_spi_exit);
 352
 353 MODULE_LICENSE("GPL");
 354 MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>");
 355 MODULE_ALIAS("spi:wl1251");