1 /* 2 * wl12xx SDIO routines 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program; if not, write to the Free Software 15 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 16 * 02110-1301 USA 17 * 18 * Copyright (C) 2005 Texas Instruments Incorporated 19 * Copyright (C) 2008 Google Inc 20 * Copyright (C) 2009 Bob Copeland (me@bobcopeland.com) 21 */ 22 #include <linux/interrupt.h> 23 #include <linux/module.h> 24 #include <linux/mod_devicetable.h> 25 #include <linux/mmc/sdio_func.h> 26 #include <linux/mmc/sdio_ids.h> 27 #include <linux/platform_device.h> 28 #include <linux/wl12xx.h> 29 #include <linux/irq.h> 30 #include <linux/pm_runtime.h> 31 #include <linux/gpio.h> 32 33 #include "wl1251.h" 34 35 #ifndef SDIO_VENDOR_ID_TI 36 #define SDIO_VENDOR_ID_TI 0x104c 37 #endif 38 39 #ifndef SDIO_DEVICE_ID_TI_WL1251 40 #define SDIO_DEVICE_ID_TI_WL1251 0x9066 41 #endif 42 43 struct wl1251_sdio { 44 struct sdio_func *func; 45 u32 elp_val; 46 }; 47 48 static struct sdio_func *wl_to_func(struct wl1251 *wl) 49 { 50 struct wl1251_sdio *wl_sdio = wl->if_priv; 51 return wl_sdio->func; 52 } 53 54 static void wl1251_sdio_interrupt(struct sdio_func *func) 55 { 56 struct wl1251 *wl = sdio_get_drvdata(func); 57 58 wl1251_debug(DEBUG_IRQ, "IRQ"); 59 60 /* FIXME should be synchronous for sdio */ 61 ieee80211_queue_work(wl->hw, &wl->irq_work); 62 } 63 64 static const struct sdio_device_id wl1251_devices[] = { 65 { SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1251) }, 66 {} 67 }; 68 MODULE_DEVICE_TABLE(sdio, wl1251_devices); 69 70 71 static void wl1251_sdio_read(struct wl1251 *wl, int addr, 72 void *buf, size_t len) 73 { 74 int ret; 75 struct sdio_func *func = wl_to_func(wl); 76 77 sdio_claim_host(func); 78 ret = sdio_memcpy_fromio(func, buf, addr, len); 79 if (ret) 80 wl1251_error("sdio read failed (%d)", ret); 81 sdio_release_host(func); 82 } 83 84 static void wl1251_sdio_write(struct wl1251 *wl, int addr, 85 void *buf, size_t len) 86 { 87 int ret; 88 struct sdio_func *func = wl_to_func(wl); 89 90 sdio_claim_host(func); 91 ret = sdio_memcpy_toio(func, addr, buf, len); 92 if (ret) 93 wl1251_error("sdio write failed (%d)", ret); 94 sdio_release_host(func); 95 } 96 97 static void wl1251_sdio_read_elp(struct wl1251 *wl, int addr, u32 *val) 98 { 99 int ret = 0; 100 struct wl1251_sdio *wl_sdio = wl->if_priv; 101 struct sdio_func *func = wl_sdio->func; 102 103 /* 104 * The hardware only supports RAW (read after write) access for 105 * reading, regular sdio_readb won't work here (it interprets 106 * the unused bits of CMD52 as write data even if we send read 107 * request). 108 */ 109 sdio_claim_host(func); 110 *val = sdio_writeb_readb(func, wl_sdio->elp_val, addr, &ret); 111 sdio_release_host(func); 112 113 if (ret) 114 wl1251_error("sdio_readb failed (%d)", ret); 115 } 116 117 static void wl1251_sdio_write_elp(struct wl1251 *wl, int addr, u32 val) 118 { 119 int ret = 0; 120 struct wl1251_sdio *wl_sdio = wl->if_priv; 121 struct sdio_func *func = wl_sdio->func; 122 123 sdio_claim_host(func); 124 sdio_writeb(func, val, addr, &ret); 125 sdio_release_host(func); 126 127 if (ret) 128 wl1251_error("sdio_writeb failed (%d)", ret); 129 else 130 wl_sdio->elp_val = val; 131 } 132 133 static void wl1251_sdio_reset(struct wl1251 *wl) 134 { 135 } 136 137 static void wl1251_sdio_enable_irq(struct wl1251 *wl) 138 { 139 struct sdio_func *func = wl_to_func(wl); 140 141 sdio_claim_host(func); 142 sdio_claim_irq(func, wl1251_sdio_interrupt); 143 sdio_release_host(func); 144 } 145 146 static void wl1251_sdio_disable_irq(struct wl1251 *wl) 147 { 148 struct sdio_func *func = wl_to_func(wl); 149 150 sdio_claim_host(func); 151 sdio_release_irq(func); 152 sdio_release_host(func); 153 } 154 155 /* Interrupts when using dedicated WLAN_IRQ pin */ 156 static irqreturn_t wl1251_line_irq(int irq, void *cookie) 157 { 158 struct wl1251 *wl = cookie; 159 160 ieee80211_queue_work(wl->hw, &wl->irq_work); 161 162 return IRQ_HANDLED; 163 } 164 165 static void wl1251_enable_line_irq(struct wl1251 *wl) 166 { 167 return enable_irq(wl->irq); 168 } 169 170 static void wl1251_disable_line_irq(struct wl1251 *wl) 171 { 172 return disable_irq(wl->irq); 173 } 174 175 static int wl1251_sdio_set_power(struct wl1251 *wl, bool enable) 176 { 177 struct sdio_func *func = wl_to_func(wl); 178 int ret; 179 180 if (enable) { 181 /* 182 * Power is controlled by runtime PM, but we still call board 183 * callback in case it wants to do any additional setup, 184 * for example enabling clock buffer for the module. 185 */ 186 if (gpio_is_valid(wl->power_gpio)) 187 gpio_set_value(wl->power_gpio, true); 188 189 190 ret = pm_runtime_get_sync(&func->dev); 191 if (ret < 0) { 192 pm_runtime_put_sync(&func->dev); 193 goto out; 194 } 195 196 sdio_claim_host(func); 197 sdio_enable_func(func); 198 sdio_release_host(func); 199 } else { 200 sdio_claim_host(func); 201 sdio_disable_func(func); 202 sdio_release_host(func); 203 204 ret = pm_runtime_put_sync(&func->dev); 205 if (ret < 0) 206 goto out; 207 208 if (gpio_is_valid(wl->power_gpio)) 209 gpio_set_value(wl->power_gpio, false); 210 } 211 212 out: 213 return ret; 214 } 215 216 static struct wl1251_if_operations wl1251_sdio_ops = { 217 .read = wl1251_sdio_read, 218 .write = wl1251_sdio_write, 219 .write_elp = wl1251_sdio_write_elp, 220 .read_elp = wl1251_sdio_read_elp, 221 .reset = wl1251_sdio_reset, 222 .power = wl1251_sdio_set_power, 223 }; 224 225 static int wl1251_sdio_probe(struct sdio_func *func, 226 const struct sdio_device_id *id) 227 { 228 int ret; 229 struct wl1251 *wl; 230 struct ieee80211_hw *hw; 231 struct wl1251_sdio *wl_sdio; 232 const struct wl1251_platform_data *wl1251_board_data; 233 234 hw = wl1251_alloc_hw(); 235 if (IS_ERR(hw)) 236 return PTR_ERR(hw); 237 238 wl = hw->priv; 239 240 wl_sdio = kzalloc(sizeof(*wl_sdio), GFP_KERNEL); 241 if (wl_sdio == NULL) { 242 ret = -ENOMEM; 243 goto out_free_hw; 244 } 245 246 sdio_claim_host(func); 247 ret = sdio_enable_func(func); 248 if (ret) 249 goto release; 250 251 sdio_set_block_size(func, 512); 252 sdio_release_host(func); 253 254 SET_IEEE80211_DEV(hw, &func->dev); 255 wl_sdio->func = func; 256 wl->if_priv = wl_sdio; 257 wl->if_ops = &wl1251_sdio_ops; 258 259 wl1251_board_data = wl1251_get_platform_data(); 260 if (!IS_ERR(wl1251_board_data)) { 261 wl->power_gpio = wl1251_board_data->power_gpio; 262 wl->irq = wl1251_board_data->irq; 263 wl->use_eeprom = wl1251_board_data->use_eeprom; 264 } 265 266 if (gpio_is_valid(wl->power_gpio)) { 267 ret = devm_gpio_request(&func->dev, wl->power_gpio, 268 "wl1251 power"); 269 if (ret) { 270 wl1251_error("Failed to request gpio: %d\n", ret); 271 goto disable; 272 } 273 } 274 275 if (wl->irq) { 276 irq_set_status_flags(wl->irq, IRQ_NOAUTOEN); 277 ret = request_irq(wl->irq, wl1251_line_irq, 0, "wl1251", wl); 278 if (ret < 0) { 279 wl1251_error("request_irq() failed: %d", ret); 280 goto disable; 281 } 282 283 irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING); 284 285 wl1251_sdio_ops.enable_irq = wl1251_enable_line_irq; 286 wl1251_sdio_ops.disable_irq = wl1251_disable_line_irq; 287 288 wl1251_info("using dedicated interrupt line"); 289 } else { 290 wl1251_sdio_ops.enable_irq = wl1251_sdio_enable_irq; 291 wl1251_sdio_ops.disable_irq = wl1251_sdio_disable_irq; 292 293 wl1251_info("using SDIO interrupt"); 294 } 295 296 ret = wl1251_init_ieee80211(wl); 297 if (ret) 298 goto out_free_irq; 299 300 sdio_set_drvdata(func, wl); 301 302 /* Tell PM core that we don't need the card to be powered now */ 303 pm_runtime_put_noidle(&func->dev); 304 305 return ret; 306 307 out_free_irq: 308 if (wl->irq) 309 free_irq(wl->irq, wl); 310 disable: 311 sdio_claim_host(func); 312 sdio_disable_func(func); 313 release: 314 sdio_release_host(func); 315 kfree(wl_sdio); 316 out_free_hw: 317 wl1251_free_hw(wl); 318 return ret; 319 } 320 321 static void wl1251_sdio_remove(struct sdio_func *func) 322 { 323 struct wl1251 *wl = sdio_get_drvdata(func); 324 struct wl1251_sdio *wl_sdio = wl->if_priv; 325 326 /* Undo decrement done above in wl1251_probe */ 327 pm_runtime_get_noresume(&func->dev); 328 329 if (wl->irq) 330 free_irq(wl->irq, wl); 331 wl1251_free_hw(wl); 332 kfree(wl_sdio); 333 334 sdio_claim_host(func); 335 sdio_release_irq(func); 336 sdio_disable_func(func); 337 sdio_release_host(func); 338 } 339 340 static int wl1251_suspend(struct device *dev) 341 { 342 /* 343 * Tell MMC/SDIO core it's OK to power down the card 344 * (if it isn't already), but not to remove it completely. 345 */ 346 return 0; 347 } 348 349 static int wl1251_resume(struct device *dev) 350 { 351 return 0; 352 } 353 354 static const struct dev_pm_ops wl1251_sdio_pm_ops = { 355 .suspend = wl1251_suspend, 356 .resume = wl1251_resume, 357 }; 358 359 static struct sdio_driver wl1251_sdio_driver = { 360 .name = "wl1251_sdio", 361 .id_table = wl1251_devices, 362 .probe = wl1251_sdio_probe, 363 .remove = wl1251_sdio_remove, 364 .drv.pm = &wl1251_sdio_pm_ops, 365 }; 366 367 static int __init wl1251_sdio_init(void) 368 { 369 int err; 370 371 err = sdio_register_driver(&wl1251_sdio_driver); 372 if (err) 373 wl1251_error("failed to register sdio driver: %d", err); 374 return err; 375 } 376 377 static void __exit wl1251_sdio_exit(void) 378 { 379 sdio_unregister_driver(&wl1251_sdio_driver); 380 wl1251_notice("unloaded"); 381 } 382 383 module_init(wl1251_sdio_init); 384 module_exit(wl1251_sdio_exit); 385 386 MODULE_LICENSE("GPL"); 387 MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>"); 388