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 32 #include "wl1251.h" 33 34 #ifndef SDIO_VENDOR_ID_TI 35 #define SDIO_VENDOR_ID_TI 0x104c 36 #endif 37 38 #ifndef SDIO_DEVICE_ID_TI_WL1251 39 #define SDIO_DEVICE_ID_TI_WL1251 0x9066 40 #endif 41 42 struct wl1251_sdio { 43 struct sdio_func *func; 44 u32 elp_val; 45 }; 46 47 static struct sdio_func *wl_to_func(struct wl1251 *wl) 48 { 49 struct wl1251_sdio *wl_sdio = wl->if_priv; 50 return wl_sdio->func; 51 } 52 53 static void wl1251_sdio_interrupt(struct sdio_func *func) 54 { 55 struct wl1251 *wl = sdio_get_drvdata(func); 56 57 wl1251_debug(DEBUG_IRQ, "IRQ"); 58 59 /* FIXME should be synchronous for sdio */ 60 ieee80211_queue_work(wl->hw, &wl->irq_work); 61 } 62 63 static const struct sdio_device_id wl1251_devices[] = { 64 { SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1251) }, 65 {} 66 }; 67 MODULE_DEVICE_TABLE(sdio, wl1251_devices); 68 69 70 static void wl1251_sdio_read(struct wl1251 *wl, int addr, 71 void *buf, size_t len) 72 { 73 int ret; 74 struct sdio_func *func = wl_to_func(wl); 75 76 sdio_claim_host(func); 77 ret = sdio_memcpy_fromio(func, buf, addr, len); 78 if (ret) 79 wl1251_error("sdio read failed (%d)", ret); 80 sdio_release_host(func); 81 } 82 83 static void wl1251_sdio_write(struct wl1251 *wl, int addr, 84 void *buf, size_t len) 85 { 86 int ret; 87 struct sdio_func *func = wl_to_func(wl); 88 89 sdio_claim_host(func); 90 ret = sdio_memcpy_toio(func, addr, buf, len); 91 if (ret) 92 wl1251_error("sdio write failed (%d)", ret); 93 sdio_release_host(func); 94 } 95 96 static void wl1251_sdio_read_elp(struct wl1251 *wl, int addr, u32 *val) 97 { 98 int ret = 0; 99 struct wl1251_sdio *wl_sdio = wl->if_priv; 100 struct sdio_func *func = wl_sdio->func; 101 102 /* 103 * The hardware only supports RAW (read after write) access for 104 * reading, regular sdio_readb won't work here (it interprets 105 * the unused bits of CMD52 as write data even if we send read 106 * request). 107 */ 108 sdio_claim_host(func); 109 *val = sdio_writeb_readb(func, wl_sdio->elp_val, addr, &ret); 110 sdio_release_host(func); 111 112 if (ret) 113 wl1251_error("sdio_readb failed (%d)", ret); 114 } 115 116 static void wl1251_sdio_write_elp(struct wl1251 *wl, int addr, u32 val) 117 { 118 int ret = 0; 119 struct wl1251_sdio *wl_sdio = wl->if_priv; 120 struct sdio_func *func = wl_sdio->func; 121 122 sdio_claim_host(func); 123 sdio_writeb(func, val, addr, &ret); 124 sdio_release_host(func); 125 126 if (ret) 127 wl1251_error("sdio_writeb failed (%d)", ret); 128 else 129 wl_sdio->elp_val = val; 130 } 131 132 static void wl1251_sdio_reset(struct wl1251 *wl) 133 { 134 } 135 136 static void wl1251_sdio_enable_irq(struct wl1251 *wl) 137 { 138 struct sdio_func *func = wl_to_func(wl); 139 140 sdio_claim_host(func); 141 sdio_claim_irq(func, wl1251_sdio_interrupt); 142 sdio_release_host(func); 143 } 144 145 static void wl1251_sdio_disable_irq(struct wl1251 *wl) 146 { 147 struct sdio_func *func = wl_to_func(wl); 148 149 sdio_claim_host(func); 150 sdio_release_irq(func); 151 sdio_release_host(func); 152 } 153 154 /* Interrupts when using dedicated WLAN_IRQ pin */ 155 static irqreturn_t wl1251_line_irq(int irq, void *cookie) 156 { 157 struct wl1251 *wl = cookie; 158 159 ieee80211_queue_work(wl->hw, &wl->irq_work); 160 161 return IRQ_HANDLED; 162 } 163 164 static void wl1251_enable_line_irq(struct wl1251 *wl) 165 { 166 return enable_irq(wl->irq); 167 } 168 169 static void wl1251_disable_line_irq(struct wl1251 *wl) 170 { 171 return disable_irq(wl->irq); 172 } 173 174 static int wl1251_sdio_set_power(struct wl1251 *wl, bool enable) 175 { 176 struct sdio_func *func = wl_to_func(wl); 177 int ret; 178 179 if (enable) { 180 /* 181 * Power is controlled by runtime PM, but we still call board 182 * callback in case it wants to do any additional setup, 183 * for example enabling clock buffer for the module. 184 */ 185 if (wl->set_power) 186 wl->set_power(true); 187 188 ret = pm_runtime_get_sync(&func->dev); 189 if (ret < 0) 190 goto out; 191 192 sdio_claim_host(func); 193 sdio_enable_func(func); 194 sdio_release_host(func); 195 } else { 196 sdio_claim_host(func); 197 sdio_disable_func(func); 198 sdio_release_host(func); 199 200 ret = pm_runtime_put_sync(&func->dev); 201 if (ret < 0) 202 goto out; 203 204 if (wl->set_power) 205 wl->set_power(false); 206 } 207 208 out: 209 return ret; 210 } 211 212 static struct wl1251_if_operations wl1251_sdio_ops = { 213 .read = wl1251_sdio_read, 214 .write = wl1251_sdio_write, 215 .write_elp = wl1251_sdio_write_elp, 216 .read_elp = wl1251_sdio_read_elp, 217 .reset = wl1251_sdio_reset, 218 .power = wl1251_sdio_set_power, 219 }; 220 221 static int wl1251_sdio_probe(struct sdio_func *func, 222 const struct sdio_device_id *id) 223 { 224 int ret; 225 struct wl1251 *wl; 226 struct ieee80211_hw *hw; 227 struct wl1251_sdio *wl_sdio; 228 const struct wl12xx_platform_data *wl12xx_board_data; 229 230 hw = wl1251_alloc_hw(); 231 if (IS_ERR(hw)) 232 return PTR_ERR(hw); 233 234 wl = hw->priv; 235 236 wl_sdio = kzalloc(sizeof(*wl_sdio), GFP_KERNEL); 237 if (wl_sdio == NULL) { 238 ret = -ENOMEM; 239 goto out_free_hw; 240 } 241 242 sdio_claim_host(func); 243 ret = sdio_enable_func(func); 244 if (ret) 245 goto release; 246 247 sdio_set_block_size(func, 512); 248 sdio_release_host(func); 249 250 SET_IEEE80211_DEV(hw, &func->dev); 251 wl_sdio->func = func; 252 wl->if_priv = wl_sdio; 253 wl->if_ops = &wl1251_sdio_ops; 254 255 wl12xx_board_data = wl12xx_get_platform_data(); 256 if (!IS_ERR(wl12xx_board_data)) { 257 wl->set_power = wl12xx_board_data->set_power; 258 wl->irq = wl12xx_board_data->irq; 259 wl->use_eeprom = wl12xx_board_data->use_eeprom; 260 } 261 262 if (wl->irq) { 263 irq_set_status_flags(wl->irq, IRQ_NOAUTOEN); 264 ret = request_irq(wl->irq, wl1251_line_irq, 0, "wl1251", wl); 265 if (ret < 0) { 266 wl1251_error("request_irq() failed: %d", ret); 267 goto disable; 268 } 269 270 irq_set_irq_type(wl->irq, IRQ_TYPE_EDGE_RISING); 271 272 wl1251_sdio_ops.enable_irq = wl1251_enable_line_irq; 273 wl1251_sdio_ops.disable_irq = wl1251_disable_line_irq; 274 275 wl1251_info("using dedicated interrupt line"); 276 } else { 277 wl1251_sdio_ops.enable_irq = wl1251_sdio_enable_irq; 278 wl1251_sdio_ops.disable_irq = wl1251_sdio_disable_irq; 279 280 wl1251_info("using SDIO interrupt"); 281 } 282 283 ret = wl1251_init_ieee80211(wl); 284 if (ret) 285 goto out_free_irq; 286 287 sdio_set_drvdata(func, wl); 288 289 /* Tell PM core that we don't need the card to be powered now */ 290 pm_runtime_put_noidle(&func->dev); 291 292 return ret; 293 294 out_free_irq: 295 if (wl->irq) 296 free_irq(wl->irq, wl); 297 disable: 298 sdio_claim_host(func); 299 sdio_disable_func(func); 300 release: 301 sdio_release_host(func); 302 kfree(wl_sdio); 303 out_free_hw: 304 wl1251_free_hw(wl); 305 return ret; 306 } 307 308 static void wl1251_sdio_remove(struct sdio_func *func) 309 { 310 struct wl1251 *wl = sdio_get_drvdata(func); 311 struct wl1251_sdio *wl_sdio = wl->if_priv; 312 313 /* Undo decrement done above in wl1251_probe */ 314 pm_runtime_get_noresume(&func->dev); 315 316 if (wl->irq) 317 free_irq(wl->irq, wl); 318 wl1251_free_hw(wl); 319 kfree(wl_sdio); 320 321 sdio_claim_host(func); 322 sdio_release_irq(func); 323 sdio_disable_func(func); 324 sdio_release_host(func); 325 } 326 327 static int wl1251_suspend(struct device *dev) 328 { 329 /* 330 * Tell MMC/SDIO core it's OK to power down the card 331 * (if it isn't already), but not to remove it completely. 332 */ 333 return 0; 334 } 335 336 static int wl1251_resume(struct device *dev) 337 { 338 return 0; 339 } 340 341 static const struct dev_pm_ops wl1251_sdio_pm_ops = { 342 .suspend = wl1251_suspend, 343 .resume = wl1251_resume, 344 }; 345 346 static struct sdio_driver wl1251_sdio_driver = { 347 .name = "wl1251_sdio", 348 .id_table = wl1251_devices, 349 .probe = wl1251_sdio_probe, 350 .remove = wl1251_sdio_remove, 351 .drv.pm = &wl1251_sdio_pm_ops, 352 }; 353 354 static int __init wl1251_sdio_init(void) 355 { 356 int err; 357 358 err = sdio_register_driver(&wl1251_sdio_driver); 359 if (err) 360 wl1251_error("failed to register sdio driver: %d", err); 361 return err; 362 } 363 364 static void __exit wl1251_sdio_exit(void) 365 { 366 sdio_unregister_driver(&wl1251_sdio_driver); 367 wl1251_notice("unloaded"); 368 } 369 370 module_init(wl1251_sdio_init); 371 module_exit(wl1251_sdio_exit); 372 373 MODULE_LICENSE("GPL"); 374 MODULE_AUTHOR("Kalle Valo <kvalo@adurom.com>"); 375