1 /* 2 * This file is part of wl1271 3 * 4 * Copyright (C) 2009-2010 Nokia Corporation 5 * 6 * Contact: Luciano Coelho <luciano.coelho@nokia.com> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * version 2 as published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 20 * 02110-1301 USA 21 * 22 */ 23 24 #include <linux/irq.h> 25 #include <linux/module.h> 26 #include <linux/vmalloc.h> 27 #include <linux/platform_device.h> 28 #include <linux/mmc/sdio.h> 29 #include <linux/mmc/sdio_func.h> 30 #include <linux/mmc/sdio_ids.h> 31 #include <linux/mmc/card.h> 32 #include <linux/mmc/host.h> 33 #include <linux/gpio.h> 34 #include <linux/wl12xx.h> 35 #include <linux/pm_runtime.h> 36 #include <linux/printk.h> 37 38 #include "wlcore.h" 39 #include "wl12xx_80211.h" 40 #include "io.h" 41 42 #ifndef SDIO_VENDOR_ID_TI 43 #define SDIO_VENDOR_ID_TI 0x0097 44 #endif 45 46 #ifndef SDIO_DEVICE_ID_TI_WL1271 47 #define SDIO_DEVICE_ID_TI_WL1271 0x4076 48 #endif 49 50 static bool dump = false; 51 52 struct wl12xx_sdio_glue { 53 struct device *dev; 54 struct platform_device *core; 55 }; 56 57 static const struct sdio_device_id wl1271_devices[] __devinitconst = { 58 { SDIO_DEVICE(SDIO_VENDOR_ID_TI, SDIO_DEVICE_ID_TI_WL1271) }, 59 {} 60 }; 61 MODULE_DEVICE_TABLE(sdio, wl1271_devices); 62 63 static void wl1271_sdio_set_block_size(struct device *child, 64 unsigned int blksz) 65 { 66 struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent); 67 struct sdio_func *func = dev_to_sdio_func(glue->dev); 68 69 sdio_claim_host(func); 70 sdio_set_block_size(func, blksz); 71 sdio_release_host(func); 72 } 73 74 static int __must_check wl12xx_sdio_raw_read(struct device *child, int addr, 75 void *buf, size_t len, bool fixed) 76 { 77 int ret; 78 struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent); 79 struct sdio_func *func = dev_to_sdio_func(glue->dev); 80 81 sdio_claim_host(func); 82 83 if (unlikely(dump)) { 84 printk(KERN_DEBUG "wlcore_sdio: READ from 0x%04x\n", addr); 85 print_hex_dump(KERN_DEBUG, "wlcore_sdio: READ ", 86 DUMP_PREFIX_OFFSET, 16, 1, 87 buf, len, false); 88 } 89 90 if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG)) { 91 ((u8 *)buf)[0] = sdio_f0_readb(func, addr, &ret); 92 dev_dbg(child->parent, "sdio read 52 addr 0x%x, byte 0x%02x\n", 93 addr, ((u8 *)buf)[0]); 94 } else { 95 if (fixed) 96 ret = sdio_readsb(func, buf, addr, len); 97 else 98 ret = sdio_memcpy_fromio(func, buf, addr, len); 99 100 dev_dbg(child->parent, "sdio read 53 addr 0x%x, %zu bytes\n", 101 addr, len); 102 } 103 104 sdio_release_host(func); 105 106 if (WARN_ON(ret)) 107 dev_err(child->parent, "sdio read failed (%d)\n", ret); 108 109 return ret; 110 } 111 112 static int __must_check wl12xx_sdio_raw_write(struct device *child, int addr, 113 void *buf, size_t len, bool fixed) 114 { 115 int ret; 116 struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent); 117 struct sdio_func *func = dev_to_sdio_func(glue->dev); 118 119 sdio_claim_host(func); 120 121 if (unlikely(dump)) { 122 printk(KERN_DEBUG "wlcore_sdio: WRITE to 0x%04x\n", addr); 123 print_hex_dump(KERN_DEBUG, "wlcore_sdio: WRITE ", 124 DUMP_PREFIX_OFFSET, 16, 1, 125 buf, len, false); 126 } 127 128 if (unlikely(addr == HW_ACCESS_ELP_CTRL_REG)) { 129 sdio_f0_writeb(func, ((u8 *)buf)[0], addr, &ret); 130 dev_dbg(child->parent, "sdio write 52 addr 0x%x, byte 0x%02x\n", 131 addr, ((u8 *)buf)[0]); 132 } else { 133 dev_dbg(child->parent, "sdio write 53 addr 0x%x, %zu bytes\n", 134 addr, len); 135 136 if (fixed) 137 ret = sdio_writesb(func, addr, buf, len); 138 else 139 ret = sdio_memcpy_toio(func, addr, buf, len); 140 } 141 142 sdio_release_host(func); 143 144 if (WARN_ON(ret)) 145 dev_err(child->parent, "sdio write failed (%d)\n", ret); 146 147 return ret; 148 } 149 150 static int wl12xx_sdio_power_on(struct wl12xx_sdio_glue *glue) 151 { 152 int ret; 153 struct sdio_func *func = dev_to_sdio_func(glue->dev); 154 struct mmc_card *card = func->card; 155 156 ret = pm_runtime_get_sync(&card->dev); 157 if (ret) { 158 /* 159 * Runtime PM might be temporarily disabled, or the device 160 * might have a positive reference counter. Make sure it is 161 * really powered on. 162 */ 163 ret = mmc_power_restore_host(card->host); 164 if (ret < 0) { 165 pm_runtime_put_sync(&card->dev); 166 goto out; 167 } 168 } 169 170 sdio_claim_host(func); 171 sdio_enable_func(func); 172 sdio_release_host(func); 173 174 out: 175 return ret; 176 } 177 178 static int wl12xx_sdio_power_off(struct wl12xx_sdio_glue *glue) 179 { 180 int ret; 181 struct sdio_func *func = dev_to_sdio_func(glue->dev); 182 struct mmc_card *card = func->card; 183 184 sdio_claim_host(func); 185 sdio_disable_func(func); 186 sdio_release_host(func); 187 188 /* Power off the card manually in case it wasn't powered off above */ 189 ret = mmc_power_save_host(card->host); 190 if (ret < 0) 191 goto out; 192 193 /* Let runtime PM know the card is powered off */ 194 pm_runtime_put_sync(&card->dev); 195 196 out: 197 return ret; 198 } 199 200 static int wl12xx_sdio_set_power(struct device *child, bool enable) 201 { 202 struct wl12xx_sdio_glue *glue = dev_get_drvdata(child->parent); 203 204 if (enable) 205 return wl12xx_sdio_power_on(glue); 206 else 207 return wl12xx_sdio_power_off(glue); 208 } 209 210 static struct wl1271_if_operations sdio_ops = { 211 .read = wl12xx_sdio_raw_read, 212 .write = wl12xx_sdio_raw_write, 213 .power = wl12xx_sdio_set_power, 214 .set_block_size = wl1271_sdio_set_block_size, 215 }; 216 217 static int __devinit wl1271_probe(struct sdio_func *func, 218 const struct sdio_device_id *id) 219 { 220 struct wl12xx_platform_data *wlan_data; 221 struct wl12xx_sdio_glue *glue; 222 struct resource res[1]; 223 mmc_pm_flag_t mmcflags; 224 int ret = -ENOMEM; 225 const char *chip_family; 226 227 /* We are only able to handle the wlan function */ 228 if (func->num != 0x02) 229 return -ENODEV; 230 231 glue = kzalloc(sizeof(*glue), GFP_KERNEL); 232 if (!glue) { 233 dev_err(&func->dev, "can't allocate glue\n"); 234 goto out; 235 } 236 237 glue->dev = &func->dev; 238 239 /* Grab access to FN0 for ELP reg. */ 240 func->card->quirks |= MMC_QUIRK_LENIENT_FN0; 241 242 /* Use block mode for transferring over one block size of data */ 243 func->card->quirks |= MMC_QUIRK_BLKSZ_FOR_BYTE_MODE; 244 245 wlan_data = wl12xx_get_platform_data(); 246 if (IS_ERR(wlan_data)) { 247 ret = PTR_ERR(wlan_data); 248 dev_err(glue->dev, "missing wlan platform data: %d\n", ret); 249 goto out_free_glue; 250 } 251 252 /* if sdio can keep power while host is suspended, enable wow */ 253 mmcflags = sdio_get_host_pm_caps(func); 254 dev_dbg(glue->dev, "sdio PM caps = 0x%x\n", mmcflags); 255 256 if (mmcflags & MMC_PM_KEEP_POWER) 257 wlan_data->pwr_in_suspend = true; 258 259 wlan_data->ops = &sdio_ops; 260 261 sdio_set_drvdata(func, glue); 262 263 /* Tell PM core that we don't need the card to be powered now */ 264 pm_runtime_put_noidle(&func->dev); 265 266 /* 267 * Due to a hardware bug, we can't differentiate wl18xx from 268 * wl12xx, because both report the same device ID. The only 269 * way to differentiate is by checking the SDIO revision, 270 * which is 3.00 on the wl18xx chips. 271 */ 272 if (func->card->cccr.sdio_vsn == SDIO_SDIO_REV_3_00) 273 chip_family = "wl18xx"; 274 else 275 chip_family = "wl12xx"; 276 277 glue->core = platform_device_alloc(chip_family, -1); 278 if (!glue->core) { 279 dev_err(glue->dev, "can't allocate platform_device"); 280 ret = -ENOMEM; 281 goto out_free_glue; 282 } 283 284 glue->core->dev.parent = &func->dev; 285 286 memset(res, 0x00, sizeof(res)); 287 288 res[0].start = wlan_data->irq; 289 res[0].flags = IORESOURCE_IRQ; 290 res[0].name = "irq"; 291 292 ret = platform_device_add_resources(glue->core, res, ARRAY_SIZE(res)); 293 if (ret) { 294 dev_err(glue->dev, "can't add resources\n"); 295 goto out_dev_put; 296 } 297 298 ret = platform_device_add_data(glue->core, wlan_data, 299 sizeof(*wlan_data)); 300 if (ret) { 301 dev_err(glue->dev, "can't add platform data\n"); 302 goto out_dev_put; 303 } 304 305 ret = platform_device_add(glue->core); 306 if (ret) { 307 dev_err(glue->dev, "can't add platform device\n"); 308 goto out_dev_put; 309 } 310 return 0; 311 312 out_dev_put: 313 platform_device_put(glue->core); 314 315 out_free_glue: 316 kfree(glue); 317 318 out: 319 return ret; 320 } 321 322 static void __devexit wl1271_remove(struct sdio_func *func) 323 { 324 struct wl12xx_sdio_glue *glue = sdio_get_drvdata(func); 325 326 /* Undo decrement done above in wl1271_probe */ 327 pm_runtime_get_noresume(&func->dev); 328 329 platform_device_del(glue->core); 330 platform_device_put(glue->core); 331 kfree(glue); 332 } 333 334 #ifdef CONFIG_PM 335 static int wl1271_suspend(struct device *dev) 336 { 337 /* Tell MMC/SDIO core it's OK to power down the card 338 * (if it isn't already), but not to remove it completely */ 339 struct sdio_func *func = dev_to_sdio_func(dev); 340 struct wl12xx_sdio_glue *glue = sdio_get_drvdata(func); 341 struct wl1271 *wl = platform_get_drvdata(glue->core); 342 mmc_pm_flag_t sdio_flags; 343 int ret = 0; 344 345 dev_dbg(dev, "wl1271 suspend. wow_enabled: %d\n", 346 wl->wow_enabled); 347 348 /* check whether sdio should keep power */ 349 if (wl->wow_enabled) { 350 sdio_flags = sdio_get_host_pm_caps(func); 351 352 if (!(sdio_flags & MMC_PM_KEEP_POWER)) { 353 dev_err(dev, "can't keep power while host " 354 "is suspended\n"); 355 ret = -EINVAL; 356 goto out; 357 } 358 359 /* keep power while host suspended */ 360 ret = sdio_set_host_pm_flags(func, MMC_PM_KEEP_POWER); 361 if (ret) { 362 dev_err(dev, "error while trying to keep power\n"); 363 goto out; 364 } 365 } 366 out: 367 return ret; 368 } 369 370 static int wl1271_resume(struct device *dev) 371 { 372 dev_dbg(dev, "wl1271 resume\n"); 373 374 return 0; 375 } 376 377 static const struct dev_pm_ops wl1271_sdio_pm_ops = { 378 .suspend = wl1271_suspend, 379 .resume = wl1271_resume, 380 }; 381 #endif 382 383 static struct sdio_driver wl1271_sdio_driver = { 384 .name = "wl1271_sdio", 385 .id_table = wl1271_devices, 386 .probe = wl1271_probe, 387 .remove = __devexit_p(wl1271_remove), 388 #ifdef CONFIG_PM 389 .drv = { 390 .pm = &wl1271_sdio_pm_ops, 391 }, 392 #endif 393 }; 394 395 static int __init wl1271_init(void) 396 { 397 return sdio_register_driver(&wl1271_sdio_driver); 398 } 399 400 static void __exit wl1271_exit(void) 401 { 402 sdio_unregister_driver(&wl1271_sdio_driver); 403 } 404 405 module_init(wl1271_init); 406 module_exit(wl1271_exit); 407 408 module_param(dump, bool, S_IRUSR | S_IWUSR); 409 MODULE_PARM_DESC(dump, "Enable sdio read/write dumps."); 410 411 MODULE_LICENSE("GPL"); 412 MODULE_AUTHOR("Luciano Coelho <coelho@ti.com>"); 413 MODULE_AUTHOR("Juuso Oikarinen <juuso.oikarinen@nokia.com>"); 414