1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * wl12xx SDIO routines 4 * 5 * Copyright (C) 2005 Texas Instruments Incorporated 6 * Copyright (C) 2008 Google Inc 7 * Copyright (C) 2009 Bob Copeland (me@bobcopeland.com) 8 */ 9 #include <linux/interrupt.h> 10 #include <linux/module.h> 11 #include <linux/mod_devicetable.h> 12 #include <linux/mmc/sdio_func.h> 13 #include <linux/mmc/sdio_ids.h> 14 #include <linux/platform_device.h> 15 #include <linux/wl12xx.h> 16 #include <linux/irq.h> 17 #include <linux/pm_runtime.h> 18 #include <linux/gpio.h> 19 20 #include "wl1251.h" 21 22 #ifndef SDIO_VENDOR_ID_TI 23 #define SDIO_VENDOR_ID_TI 0x104c 24 #endif 25 26 #ifndef SDIO_DEVICE_ID_TI_WL1251 27 #define SDIO_DEVICE_ID_TI_WL1251 0x9066 28 #endif 29 30 struct wl1251_sdio { 31 struct sdio_func *func; 32 u32 elp_val; 33 }; 34 35 static struct sdio_func *wl_to_func(struct wl1251 *wl) 36 { 37 struct wl1251_sdio *wl_sdio = wl->if_priv; 38 return wl_sdio->func; 39 } 40 41 static void wl1251_sdio_interrupt(struct sdio_func *func) 42 { 43 struct wl1251 *wl = sdio_get_drvdata(func); 44 45 wl1251_debug(DEBUG_IRQ, "IRQ"); 46 47 /* FIXME should be synchronous for sdio */ 48 ieee80211_queue_work(wl->hw, &wl->irq_work); 49 } 50 51 static const struct sdio_device_id wl1251_devices[] = { 52 { SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1251) }, 53 {} 54 }; 55 MODULE_DEVICE_TABLE(sdio, wl1251_devices); 56 57 58 static void wl1251_sdio_read(struct wl1251 *wl, int addr, 59 void *buf, size_t len) 60 { 61 int ret; 62 struct sdio_func *func = wl_to_func(wl); 63 64 sdio_claim_host(func); 65 ret = sdio_memcpy_fromio(func, buf, addr, len); 66 if (ret) 67 wl1251_error("sdio read failed (%d)", ret); 68 sdio_release_host(func); 69 } 70 71 static void wl1251_sdio_write(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_toio(func, addr, buf, len); 79 if (ret) 80 wl1251_error("sdio write failed (%d)", ret); 81 sdio_release_host(func); 82 } 83 84 static void wl1251_sdio_read_elp(struct wl1251 *wl, int addr, u32 *val) 85 { 86 int ret = 0; 87 struct wl1251_sdio *wl_sdio = wl->if_priv; 88 struct sdio_func *func = wl_sdio->func; 89 90 /* 91 * The hardware only supports RAW (read after write) access for 92 * reading, regular sdio_readb won't work here (it interprets 93 * the unused bits of CMD52 as write data even if we send read 94 * request). 95 */ 96 sdio_claim_host(func); 97 *val = sdio_writeb_readb(func, wl_sdio->elp_val, addr, &ret); 98 sdio_release_host(func); 99 100 if (ret) 101 wl1251_error("sdio_readb failed (%d)", ret); 102 } 103 104 static void wl1251_sdio_write_elp(struct wl1251 *wl, int addr, u32 val) 105 { 106 int ret = 0; 107 struct wl1251_sdio *wl_sdio = wl->if_priv; 108 struct sdio_func *func = wl_sdio->func; 109 110 sdio_claim_host(func); 111 sdio_writeb(func, val, addr, &ret); 112 sdio_release_host(func); 113 114 if (ret) 115 wl1251_error("sdio_writeb failed (%d)", ret); 116 else 117 wl_sdio->elp_val = val; 118 } 119 120 static void wl1251_sdio_reset(struct wl1251 *wl) 121 { 122 } 123 124 static void wl1251_sdio_enable_irq(struct wl1251 *wl) 125 { 126 struct sdio_func *func = wl_to_func(wl); 127 128 sdio_claim_host(func); 129 sdio_claim_irq(func, wl1251_sdio_interrupt); 130 sdio_release_host(func); 131 } 132 133 static void wl1251_sdio_disable_irq(struct wl1251 *wl) 134 { 135 struct sdio_func *func = wl_to_func(wl); 136 137 sdio_claim_host(func); 138 sdio_release_irq(func); 139 sdio_release_host(func); 140 } 141 142 /* Interrupts when using dedicated WLAN_IRQ pin */ 143 static irqreturn_t wl1251_line_irq(int irq, void *cookie) 144 { 145 struct wl1251 *wl = cookie; 146 147 ieee80211_queue_work(wl->hw, &wl->irq_work); 148 149 return IRQ_HANDLED; 150 } 151 152 static void wl1251_enable_line_irq(struct wl1251 *wl) 153 { 154 return enable_irq(wl->irq); 155 } 156 157 static void wl1251_disable_line_irq(struct wl1251 *wl) 158 { 159 return disable_irq(wl->irq); 160 } 161 162 static int wl1251_sdio_set_power(struct wl1251 *wl, bool enable) 163 { 164 struct sdio_func *func = wl_to_func(wl); 165 int ret; 166 167 if (enable) { 168 /* 169 * Power is controlled by runtime PM, but we still call board 170 * callback in case it wants to do any additional setup, 171 * for example enabling clock buffer for the module. 172 */ 173 if (gpio_is_valid(wl->power_gpio)) 174 gpio_set_value(wl->power_gpio, true); 175 176 177 ret = pm_runtime_get_sync(&func->dev); 178 if (ret < 0) { 179 pm_runtime_put_sync(&func->dev); 180 goto out; 181 } 182 183 sdio_claim_host(func); 184 sdio_enable_func(func); 185 sdio_release_host(func); 186 } else { 187 sdio_claim_host(func); 188 sdio_disable_func(func); 189 sdio_release_host(func); 190 191 ret = pm_runtime_put_sync(&func->dev); 192 if (ret < 0) 193 goto out; 194 195 if (gpio_is_valid(wl->power_gpio)) 196 gpio_set_value(wl->power_gpio, false); 197 } 198 199 out: 200 return ret; 201 } 202 203 static struct wl1251_if_operations wl1251_sdio_ops = { 204 .read = wl1251_sdio_read, 205 .write = wl1251_sdio_write, 206 .write_elp = wl1251_sdio_write_elp, 207 .read_elp = wl1251_sdio_read_elp, 208 .reset = wl1251_sdio_reset, 209 .power = wl1251_sdio_set_power, 210 }; 211 212 static int wl1251_sdio_probe(struct sdio_func *func, 213 const struct sdio_device_id *id) 214 { 215 int ret; 216 struct wl1251 *wl; 217 struct ieee80211_hw *hw; 218 struct wl1251_sdio *wl_sdio; 219 const struct wl1251_platform_data *wl1251_board_data; 220 221 hw = wl1251_alloc_hw(); 222 if (IS_ERR(hw)) 223 return PTR_ERR(hw); 224 225 wl = hw->priv; 226 227 wl_sdio = kzalloc(sizeof(*wl_sdio), GFP_KERNEL); 228 if (wl_sdio == NULL) { 229 ret = -ENOMEM; 230 goto out_free_hw; 231 } 232 233 sdio_claim_host(func); 234 ret = sdio_enable_func(func); 235 if (ret) 236 goto release; 237 238 sdio_set_block_size(func, 512); 239 sdio_release_host(func); 240 241 SET_IEEE80211_DEV(hw, &func->dev); 242 wl_sdio->func = func; 243 wl->if_priv = wl_sdio; 244 wl->if_ops = &wl1251_sdio_ops; 245 246 wl1251_board_data = wl1251_get_platform_data(); 247 if (!IS_ERR(wl1251_board_data)) { 248 wl->power_gpio = wl1251_board_data->power_gpio; 249 wl->irq = wl1251_board_data->irq; 250 wl->use_eeprom = wl1251_board_data->use_eeprom; 251 } 252 253 if (gpio_is_valid(wl->power_gpio)) { 254 ret = devm_gpio_request(&func->dev, wl->power_gpio, 255 "wl1251 power"); 256 if (ret) { 257 wl1251_error("Failed to request gpio: %d\n", ret); 258 goto disable; 259 } 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