Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 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/swab.h> |
| 27 | #include <linux/crc7.h> |
| 28 | #include <linux/spi/spi.h> |
| 29 | #include <linux/wl12xx.h> |
| 30 | #include <linux/gpio.h> |
| 31 | #include <linux/of.h> |
| 32 | #include <linux/of_gpio.h> |
| 33 | #include <linux/regulator/consumer.h> |
| 34 | |
| 35 | #include "wl1251.h" |
| 36 | #include "reg.h" |
| 37 | #include "spi.h" |
| 38 | |
| 39 | static irqreturn_t wl1251_irq(int irq, void *cookie) |
| 40 | { |
| 41 | struct wl1251 *wl; |
| 42 | |
| 43 | wl1251_debug(DEBUG_IRQ, "IRQ"); |
| 44 | |
| 45 | wl = cookie; |
| 46 | |
| 47 | ieee80211_queue_work(wl->hw, &wl->irq_work); |
| 48 | |
| 49 | return IRQ_HANDLED; |
| 50 | } |
| 51 | |
| 52 | static struct spi_device *wl_to_spi(struct wl1251 *wl) |
| 53 | { |
| 54 | return wl->if_priv; |
| 55 | } |
| 56 | |
| 57 | static void wl1251_spi_reset(struct wl1251 *wl) |
| 58 | { |
| 59 | u8 *cmd; |
| 60 | struct spi_transfer t; |
| 61 | struct spi_message m; |
| 62 | |
| 63 | cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); |
| 64 | if (!cmd) { |
| 65 | wl1251_error("could not allocate cmd for spi reset"); |
| 66 | return; |
| 67 | } |
| 68 | |
| 69 | memset(&t, 0, sizeof(t)); |
| 70 | spi_message_init(&m); |
| 71 | |
| 72 | memset(cmd, 0xff, WSPI_INIT_CMD_LEN); |
| 73 | |
| 74 | t.tx_buf = cmd; |
| 75 | t.len = WSPI_INIT_CMD_LEN; |
| 76 | spi_message_add_tail(&t, &m); |
| 77 | |
| 78 | spi_sync(wl_to_spi(wl), &m); |
| 79 | |
| 80 | wl1251_dump(DEBUG_SPI, "spi reset -> ", cmd, WSPI_INIT_CMD_LEN); |
| 81 | |
| 82 | kfree(cmd); |
| 83 | } |
| 84 | |
| 85 | static void wl1251_spi_wake(struct wl1251 *wl) |
| 86 | { |
| 87 | struct spi_transfer t; |
| 88 | struct spi_message m; |
| 89 | u8 *cmd = kzalloc(WSPI_INIT_CMD_LEN, GFP_KERNEL); |
| 90 | |
| 91 | if (!cmd) { |
| 92 | wl1251_error("could not allocate cmd for spi init"); |
| 93 | return; |
| 94 | } |
| 95 | |
| 96 | memset(&t, 0, sizeof(t)); |
| 97 | spi_message_init(&m); |
| 98 | |
| 99 | /* Set WSPI_INIT_COMMAND |
| 100 | * the data is being send from the MSB to LSB |
| 101 | */ |
| 102 | cmd[0] = 0xff; |
| 103 | cmd[1] = 0xff; |
| 104 | cmd[2] = WSPI_INIT_CMD_START | WSPI_INIT_CMD_TX; |
| 105 | cmd[3] = 0; |
| 106 | cmd[4] = 0; |
| 107 | cmd[5] = HW_ACCESS_WSPI_INIT_CMD_MASK << 3; |
| 108 | cmd[5] |= HW_ACCESS_WSPI_FIXED_BUSY_LEN & WSPI_INIT_CMD_FIXEDBUSY_LEN; |
| 109 | |
| 110 | cmd[6] = WSPI_INIT_CMD_IOD | WSPI_INIT_CMD_IP | WSPI_INIT_CMD_CS |
| 111 | | WSPI_INIT_CMD_WSPI | WSPI_INIT_CMD_WS; |
| 112 | |
| 113 | if (HW_ACCESS_WSPI_FIXED_BUSY_LEN == 0) |
| 114 | cmd[6] |= WSPI_INIT_CMD_DIS_FIXEDBUSY; |
| 115 | else |
| 116 | cmd[6] |= WSPI_INIT_CMD_EN_FIXEDBUSY; |
| 117 | |
| 118 | cmd[7] = crc7_be(0, cmd+2, WSPI_INIT_CMD_CRC_LEN) | WSPI_INIT_CMD_END; |
| 119 | /* |
| 120 | * The above is the logical order; it must actually be stored |
| 121 | * in the buffer byte-swapped. |
| 122 | */ |
| 123 | __swab32s((u32 *)cmd); |
| 124 | __swab32s((u32 *)cmd+1); |
| 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 | kfree(cmd); |
| 135 | } |
| 136 | |
| 137 | static void wl1251_spi_reset_wake(struct wl1251 *wl) |
| 138 | { |
| 139 | wl1251_spi_reset(wl); |
| 140 | wl1251_spi_wake(wl); |
| 141 | } |
| 142 | |
| 143 | static void wl1251_spi_read(struct wl1251 *wl, int addr, void *buf, |
| 144 | size_t len) |
| 145 | { |
| 146 | struct spi_transfer t[3]; |
| 147 | struct spi_message m; |
| 148 | u8 *busy_buf; |
| 149 | u32 *cmd; |
| 150 | |
| 151 | cmd = &wl->buffer_cmd; |
| 152 | busy_buf = wl->buffer_busyword; |
| 153 | |
| 154 | *cmd = 0; |
| 155 | *cmd |= WSPI_CMD_READ; |
| 156 | *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; |
| 157 | *cmd |= addr & WSPI_CMD_BYTE_ADDR; |
| 158 | |
| 159 | spi_message_init(&m); |
| 160 | memset(t, 0, sizeof(t)); |
| 161 | |
| 162 | t[0].tx_buf = cmd; |
| 163 | t[0].len = 4; |
| 164 | spi_message_add_tail(&t[0], &m); |
| 165 | |
| 166 | /* Busy and non busy words read */ |
| 167 | t[1].rx_buf = busy_buf; |
| 168 | t[1].len = WL1251_BUSY_WORD_LEN; |
| 169 | spi_message_add_tail(&t[1], &m); |
| 170 | |
| 171 | t[2].rx_buf = buf; |
| 172 | t[2].len = len; |
| 173 | spi_message_add_tail(&t[2], &m); |
| 174 | |
| 175 | spi_sync(wl_to_spi(wl), &m); |
| 176 | |
| 177 | /* FIXME: check busy words */ |
| 178 | |
| 179 | wl1251_dump(DEBUG_SPI, "spi_read cmd -> ", cmd, sizeof(*cmd)); |
| 180 | wl1251_dump(DEBUG_SPI, "spi_read buf <- ", buf, len); |
| 181 | } |
| 182 | |
| 183 | static void wl1251_spi_write(struct wl1251 *wl, int addr, void *buf, |
| 184 | size_t len) |
| 185 | { |
| 186 | struct spi_transfer t[2]; |
| 187 | struct spi_message m; |
| 188 | u32 *cmd; |
| 189 | |
| 190 | cmd = &wl->buffer_cmd; |
| 191 | |
| 192 | *cmd = 0; |
| 193 | *cmd |= WSPI_CMD_WRITE; |
| 194 | *cmd |= (len << WSPI_CMD_BYTE_LENGTH_OFFSET) & WSPI_CMD_BYTE_LENGTH; |
| 195 | *cmd |= addr & WSPI_CMD_BYTE_ADDR; |
| 196 | |
| 197 | spi_message_init(&m); |
| 198 | memset(t, 0, sizeof(t)); |
| 199 | |
| 200 | t[0].tx_buf = cmd; |
| 201 | t[0].len = sizeof(*cmd); |
| 202 | spi_message_add_tail(&t[0], &m); |
| 203 | |
| 204 | t[1].tx_buf = buf; |
| 205 | t[1].len = len; |
| 206 | spi_message_add_tail(&t[1], &m); |
| 207 | |
| 208 | spi_sync(wl_to_spi(wl), &m); |
| 209 | |
| 210 | wl1251_dump(DEBUG_SPI, "spi_write cmd -> ", cmd, sizeof(*cmd)); |
| 211 | wl1251_dump(DEBUG_SPI, "spi_write buf -> ", buf, len); |
| 212 | } |
| 213 | |
| 214 | static void wl1251_spi_enable_irq(struct wl1251 *wl) |
| 215 | { |
| 216 | return enable_irq(wl->irq); |
| 217 | } |
| 218 | |
| 219 | static void wl1251_spi_disable_irq(struct wl1251 *wl) |
| 220 | { |
| 221 | return disable_irq(wl->irq); |
| 222 | } |
| 223 | |
| 224 | static int wl1251_spi_set_power(struct wl1251 *wl, bool enable) |
| 225 | { |
| 226 | if (gpio_is_valid(wl->power_gpio)) |
| 227 | gpio_set_value(wl->power_gpio, enable); |
| 228 | |
| 229 | return 0; |
| 230 | } |
| 231 | |
| 232 | static const struct wl1251_if_operations wl1251_spi_ops = { |
| 233 | .read = wl1251_spi_read, |
| 234 | .write = wl1251_spi_write, |
| 235 | .reset = wl1251_spi_reset_wake, |
| 236 | .enable_irq = wl1251_spi_enable_irq, |
| 237 | .disable_irq = wl1251_spi_disable_irq, |
| 238 | .power = wl1251_spi_set_power, |
| 239 | }; |
| 240 | |
| 241 | static int wl1251_spi_probe(struct spi_device *spi) |
| 242 | { |
| 243 | struct wl1251_platform_data *pdata = dev_get_platdata(&spi->dev); |
| 244 | struct device_node *np = spi->dev.of_node; |
| 245 | struct ieee80211_hw *hw; |
| 246 | struct wl1251 *wl; |
| 247 | int ret; |
| 248 | |
| 249 | if (!np && !pdata) { |
| 250 | wl1251_error("no platform data"); |
| 251 | return -ENODEV; |
| 252 | } |
| 253 | |
| 254 | hw = wl1251_alloc_hw(); |
| 255 | if (IS_ERR(hw)) |
| 256 | return PTR_ERR(hw); |
| 257 | |
| 258 | wl = hw->priv; |
| 259 | |
| 260 | SET_IEEE80211_DEV(hw, &spi->dev); |
| 261 | spi_set_drvdata(spi, wl); |
| 262 | wl->if_priv = spi; |
| 263 | wl->if_ops = &wl1251_spi_ops; |
| 264 | |
| 265 | /* This is the only SPI value that we need to set here, the rest |
| 266 | * comes from the board-peripherals file |
| 267 | */ |
| 268 | spi->bits_per_word = 32; |
| 269 | |
| 270 | ret = spi_setup(spi); |
| 271 | if (ret < 0) { |
| 272 | wl1251_error("spi_setup failed"); |
| 273 | goto out_free; |
| 274 | } |
| 275 | |
| 276 | if (np) { |
| 277 | wl->use_eeprom = of_property_read_bool(np, "ti,wl1251-has-eeprom"); |
| 278 | wl->power_gpio = of_get_named_gpio(np, "ti,power-gpio", 0); |
| 279 | } else if (pdata) { |
| 280 | wl->power_gpio = pdata->power_gpio; |
| 281 | wl->use_eeprom = pdata->use_eeprom; |
| 282 | } |
| 283 | |
| 284 | if (wl->power_gpio == -EPROBE_DEFER) { |
| 285 | ret = -EPROBE_DEFER; |
| 286 | goto out_free; |
| 287 | } |
| 288 | |
| 289 | if (gpio_is_valid(wl->power_gpio)) { |
| 290 | ret = devm_gpio_request_one(&spi->dev, wl->power_gpio, |
| 291 | GPIOF_OUT_INIT_LOW, "wl1251 power"); |
| 292 | if (ret) { |
| 293 | wl1251_error("Failed to request gpio: %d\n", ret); |
| 294 | goto out_free; |
| 295 | } |
| 296 | } else { |
| 297 | wl1251_error("set power gpio missing in platform data"); |
| 298 | ret = -ENODEV; |
| 299 | goto out_free; |
| 300 | } |
| 301 | |
| 302 | wl->irq = spi->irq; |
| 303 | if (wl->irq < 0) { |
| 304 | wl1251_error("irq missing in platform data"); |
| 305 | ret = -ENODEV; |
| 306 | goto out_free; |
| 307 | } |
| 308 | |
| 309 | irq_set_status_flags(wl->irq, IRQ_NOAUTOEN); |
| 310 | ret = devm_request_irq(&spi->dev, wl->irq, wl1251_irq, 0, |
| 311 | DRIVER_NAME, wl); |
| 312 | if (ret < 0) { |
| 313 | wl1251_error("request_irq() failed: %d", ret); |
| 314 | goto out_free; |
| 315 | } |
| 316 | |
| 317 | irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING); |
| 318 | |
| 319 | wl->vio = devm_regulator_get(&spi->dev, "vio"); |
| 320 | if (IS_ERR(wl->vio)) { |
| 321 | ret = PTR_ERR(wl->vio); |
| 322 | wl1251_error("vio regulator missing: %d", ret); |
| 323 | goto out_free; |
| 324 | } |
| 325 | |
| 326 | ret = regulator_enable(wl->vio); |
| 327 | if (ret) |
| 328 | goto out_free; |
| 329 | |
| 330 | ret = wl1251_init_ieee80211(wl); |
| 331 | if (ret) |
| 332 | goto disable_regulator; |
| 333 | |
| 334 | return 0; |
| 335 | |
| 336 | disable_regulator: |
| 337 | regulator_disable(wl->vio); |
| 338 | out_free: |
| 339 | ieee80211_free_hw(hw); |
| 340 | |
| 341 | return ret; |
| 342 | } |
| 343 | |
| 344 | static int wl1251_spi_remove(struct spi_device *spi) |
| 345 | { |
| 346 | struct wl1251 *wl = spi_get_drvdata(spi); |
| 347 | |
| 348 | wl1251_free_hw(wl); |
| 349 | regulator_disable(wl->vio); |
| 350 | |
| 351 | return 0; |
| 352 | } |
| 353 | |
| 354 | static struct spi_driver wl1251_spi_driver = { |
| 355 | .driver = { |
| 356 | .name = DRIVER_NAME, |
| 357 | }, |
| 358 | |
| 359 | .probe = wl1251_spi_probe, |
| 360 | .remove = wl1251_spi_remove, |
| 361 | }; |
| 362 | |
| 363 | module_spi_driver(wl1251_spi_driver); |
| 364 | |
| 365 | MODULE_LICENSE("GPL"); |
| 366 | MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>"); |
| 367 | MODULE_ALIAS("spi:wl1251"); |