1 /* 2 * Secure Digital Host Controller Interface ACPI driver. 3 * 4 * Copyright (c) 2012, Intel Corporation. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions 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 it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 * 15 * You should have received a copy of the GNU General Public License along with 16 * this program; if not, write to the Free Software Foundation, Inc., 17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 */ 20 21 #include <linux/init.h> 22 #include <linux/export.h> 23 #include <linux/module.h> 24 #include <linux/device.h> 25 #include <linux/platform_device.h> 26 #include <linux/ioport.h> 27 #include <linux/io.h> 28 #include <linux/dma-mapping.h> 29 #include <linux/compiler.h> 30 #include <linux/stddef.h> 31 #include <linux/bitops.h> 32 #include <linux/types.h> 33 #include <linux/err.h> 34 #include <linux/gpio.h> 35 #include <linux/interrupt.h> 36 #include <linux/acpi.h> 37 #include <linux/acpi_gpio.h> 38 #include <linux/pm.h> 39 #include <linux/pm_runtime.h> 40 #include <linux/delay.h> 41 42 #include <linux/mmc/host.h> 43 #include <linux/mmc/pm.h> 44 #include <linux/mmc/sdhci.h> 45 46 #include "sdhci.h" 47 48 enum { 49 SDHCI_ACPI_SD_CD = BIT(0), 50 SDHCI_ACPI_RUNTIME_PM = BIT(1), 51 }; 52 53 struct sdhci_acpi_chip { 54 const struct sdhci_ops *ops; 55 unsigned int quirks; 56 unsigned int quirks2; 57 unsigned long caps; 58 unsigned int caps2; 59 mmc_pm_flag_t pm_caps; 60 }; 61 62 struct sdhci_acpi_slot { 63 const struct sdhci_acpi_chip *chip; 64 unsigned int quirks; 65 unsigned int quirks2; 66 unsigned long caps; 67 unsigned int caps2; 68 mmc_pm_flag_t pm_caps; 69 unsigned int flags; 70 }; 71 72 struct sdhci_acpi_host { 73 struct sdhci_host *host; 74 const struct sdhci_acpi_slot *slot; 75 struct platform_device *pdev; 76 bool use_runtime_pm; 77 }; 78 79 static inline bool sdhci_acpi_flag(struct sdhci_acpi_host *c, unsigned int flag) 80 { 81 return c->slot && (c->slot->flags & flag); 82 } 83 84 static int sdhci_acpi_enable_dma(struct sdhci_host *host) 85 { 86 return 0; 87 } 88 89 static void sdhci_acpi_int_hw_reset(struct sdhci_host *host) 90 { 91 u8 reg; 92 93 reg = sdhci_readb(host, SDHCI_POWER_CONTROL); 94 reg |= 0x10; 95 sdhci_writeb(host, reg, SDHCI_POWER_CONTROL); 96 /* For eMMC, minimum is 1us but give it 9us for good measure */ 97 udelay(9); 98 reg &= ~0x10; 99 sdhci_writeb(host, reg, SDHCI_POWER_CONTROL); 100 /* For eMMC, minimum is 200us but give it 300us for good measure */ 101 usleep_range(300, 1000); 102 } 103 104 static const struct sdhci_ops sdhci_acpi_ops_dflt = { 105 .enable_dma = sdhci_acpi_enable_dma, 106 }; 107 108 static const struct sdhci_ops sdhci_acpi_ops_int = { 109 .enable_dma = sdhci_acpi_enable_dma, 110 .hw_reset = sdhci_acpi_int_hw_reset, 111 }; 112 113 static const struct sdhci_acpi_chip sdhci_acpi_chip_int = { 114 .ops = &sdhci_acpi_ops_int, 115 }; 116 117 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = { 118 .chip = &sdhci_acpi_chip_int, 119 .caps = MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE | MMC_CAP_HW_RESET, 120 .caps2 = MMC_CAP2_HC_ERASE_SZ, 121 .flags = SDHCI_ACPI_RUNTIME_PM, 122 }; 123 124 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sdio = { 125 .quirks2 = SDHCI_QUIRK2_HOST_OFF_CARD_ON, 126 .caps = MMC_CAP_NONREMOVABLE | MMC_CAP_POWER_OFF_CARD, 127 .flags = SDHCI_ACPI_RUNTIME_PM, 128 .pm_caps = MMC_PM_KEEP_POWER, 129 }; 130 131 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sd = { 132 .flags = SDHCI_ACPI_SD_CD | SDHCI_ACPI_RUNTIME_PM, 133 .quirks2 = SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON, 134 }; 135 136 struct sdhci_acpi_uid_slot { 137 const char *hid; 138 const char *uid; 139 const struct sdhci_acpi_slot *slot; 140 }; 141 142 static const struct sdhci_acpi_uid_slot sdhci_acpi_uids[] = { 143 { "80860F14" , "1" , &sdhci_acpi_slot_int_emmc }, 144 { "80860F14" , "3" , &sdhci_acpi_slot_int_sd }, 145 { "INT33BB" , "2" , &sdhci_acpi_slot_int_sdio }, 146 { "INT33C6" , NULL, &sdhci_acpi_slot_int_sdio }, 147 { "PNP0D40" }, 148 { }, 149 }; 150 151 static const struct acpi_device_id sdhci_acpi_ids[] = { 152 { "80860F14" }, 153 { "INT33BB" }, 154 { "INT33C6" }, 155 { "PNP0D40" }, 156 { }, 157 }; 158 MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids); 159 160 static const struct sdhci_acpi_slot *sdhci_acpi_get_slot_by_ids(const char *hid, 161 const char *uid) 162 { 163 const struct sdhci_acpi_uid_slot *u; 164 165 for (u = sdhci_acpi_uids; u->hid; u++) { 166 if (strcmp(u->hid, hid)) 167 continue; 168 if (!u->uid) 169 return u->slot; 170 if (uid && !strcmp(u->uid, uid)) 171 return u->slot; 172 } 173 return NULL; 174 } 175 176 static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(acpi_handle handle, 177 const char *hid) 178 { 179 const struct sdhci_acpi_slot *slot; 180 struct acpi_device_info *info; 181 const char *uid = NULL; 182 acpi_status status; 183 184 status = acpi_get_object_info(handle, &info); 185 if (!ACPI_FAILURE(status) && (info->valid & ACPI_VALID_UID)) 186 uid = info->unique_id.string; 187 188 slot = sdhci_acpi_get_slot_by_ids(hid, uid); 189 190 kfree(info); 191 return slot; 192 } 193 194 #ifdef CONFIG_PM_RUNTIME 195 196 static irqreturn_t sdhci_acpi_sd_cd(int irq, void *dev_id) 197 { 198 mmc_detect_change(dev_id, msecs_to_jiffies(200)); 199 return IRQ_HANDLED; 200 } 201 202 static int sdhci_acpi_add_own_cd(struct device *dev, int gpio, 203 struct mmc_host *mmc) 204 { 205 unsigned long flags; 206 int err, irq; 207 208 if (gpio < 0) { 209 err = gpio; 210 goto out; 211 } 212 213 err = devm_gpio_request_one(dev, gpio, GPIOF_DIR_IN, "sd_cd"); 214 if (err) 215 goto out; 216 217 irq = gpio_to_irq(gpio); 218 if (irq < 0) { 219 err = irq; 220 goto out_free; 221 } 222 223 flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING; 224 err = devm_request_irq(dev, irq, sdhci_acpi_sd_cd, flags, "sd_cd", mmc); 225 if (err) 226 goto out_free; 227 228 return 0; 229 230 out_free: 231 devm_gpio_free(dev, gpio); 232 out: 233 dev_warn(dev, "failed to setup card detect wake up\n"); 234 return err; 235 } 236 237 #else 238 239 static int sdhci_acpi_add_own_cd(struct device *dev, int gpio, 240 struct mmc_host *mmc) 241 { 242 return 0; 243 } 244 245 #endif 246 247 static int sdhci_acpi_probe(struct platform_device *pdev) 248 { 249 struct device *dev = &pdev->dev; 250 acpi_handle handle = ACPI_HANDLE(dev); 251 struct acpi_device *device; 252 struct sdhci_acpi_host *c; 253 struct sdhci_host *host; 254 struct resource *iomem; 255 resource_size_t len; 256 const char *hid; 257 int err, gpio; 258 259 if (acpi_bus_get_device(handle, &device)) 260 return -ENODEV; 261 262 if (acpi_bus_get_status(device) || !device->status.present) 263 return -ENODEV; 264 265 hid = acpi_device_hid(device); 266 267 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 268 if (!iomem) 269 return -ENOMEM; 270 271 len = resource_size(iomem); 272 if (len < 0x100) 273 dev_err(dev, "Invalid iomem size!\n"); 274 275 if (!devm_request_mem_region(dev, iomem->start, len, dev_name(dev))) 276 return -ENOMEM; 277 278 host = sdhci_alloc_host(dev, sizeof(struct sdhci_acpi_host)); 279 if (IS_ERR(host)) 280 return PTR_ERR(host); 281 282 gpio = acpi_get_gpio_by_index(dev, 0, NULL); 283 284 c = sdhci_priv(host); 285 c->host = host; 286 c->slot = sdhci_acpi_get_slot(handle, hid); 287 c->pdev = pdev; 288 c->use_runtime_pm = sdhci_acpi_flag(c, SDHCI_ACPI_RUNTIME_PM); 289 290 platform_set_drvdata(pdev, c); 291 292 host->hw_name = "ACPI"; 293 host->ops = &sdhci_acpi_ops_dflt; 294 host->irq = platform_get_irq(pdev, 0); 295 296 host->ioaddr = devm_ioremap_nocache(dev, iomem->start, 297 resource_size(iomem)); 298 if (host->ioaddr == NULL) { 299 err = -ENOMEM; 300 goto err_free; 301 } 302 303 if (!dev->dma_mask) { 304 u64 dma_mask; 305 306 if (sdhci_readl(host, SDHCI_CAPABILITIES) & SDHCI_CAN_64BIT) { 307 /* 64-bit DMA is not supported at present */ 308 dma_mask = DMA_BIT_MASK(32); 309 } else { 310 dma_mask = DMA_BIT_MASK(32); 311 } 312 313 dev->dma_mask = &dev->coherent_dma_mask; 314 dev->coherent_dma_mask = dma_mask; 315 } 316 317 if (c->slot) { 318 if (c->slot->chip) { 319 host->ops = c->slot->chip->ops; 320 host->quirks |= c->slot->chip->quirks; 321 host->quirks2 |= c->slot->chip->quirks2; 322 host->mmc->caps |= c->slot->chip->caps; 323 host->mmc->caps2 |= c->slot->chip->caps2; 324 host->mmc->pm_caps |= c->slot->chip->pm_caps; 325 } 326 host->quirks |= c->slot->quirks; 327 host->quirks2 |= c->slot->quirks2; 328 host->mmc->caps |= c->slot->caps; 329 host->mmc->caps2 |= c->slot->caps2; 330 host->mmc->pm_caps |= c->slot->pm_caps; 331 } 332 333 host->mmc->caps2 |= MMC_CAP2_NO_PRESCAN_POWERUP; 334 335 err = sdhci_add_host(host); 336 if (err) 337 goto err_free; 338 339 if (sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD)) { 340 if (sdhci_acpi_add_own_cd(dev, gpio, host->mmc)) 341 c->use_runtime_pm = false; 342 } 343 344 if (c->use_runtime_pm) { 345 pm_runtime_set_active(dev); 346 pm_suspend_ignore_children(dev, 1); 347 pm_runtime_set_autosuspend_delay(dev, 50); 348 pm_runtime_use_autosuspend(dev); 349 pm_runtime_enable(dev); 350 } 351 352 return 0; 353 354 err_free: 355 sdhci_free_host(c->host); 356 return err; 357 } 358 359 static int sdhci_acpi_remove(struct platform_device *pdev) 360 { 361 struct sdhci_acpi_host *c = platform_get_drvdata(pdev); 362 struct device *dev = &pdev->dev; 363 int dead; 364 365 if (c->use_runtime_pm) { 366 pm_runtime_get_sync(dev); 367 pm_runtime_disable(dev); 368 pm_runtime_put_noidle(dev); 369 } 370 371 dead = (sdhci_readl(c->host, SDHCI_INT_STATUS) == ~0); 372 sdhci_remove_host(c->host, dead); 373 sdhci_free_host(c->host); 374 375 return 0; 376 } 377 378 #ifdef CONFIG_PM_SLEEP 379 380 static int sdhci_acpi_suspend(struct device *dev) 381 { 382 struct sdhci_acpi_host *c = dev_get_drvdata(dev); 383 384 return sdhci_suspend_host(c->host); 385 } 386 387 static int sdhci_acpi_resume(struct device *dev) 388 { 389 struct sdhci_acpi_host *c = dev_get_drvdata(dev); 390 391 return sdhci_resume_host(c->host); 392 } 393 394 #else 395 396 #define sdhci_acpi_suspend NULL 397 #define sdhci_acpi_resume NULL 398 399 #endif 400 401 #ifdef CONFIG_PM_RUNTIME 402 403 static int sdhci_acpi_runtime_suspend(struct device *dev) 404 { 405 struct sdhci_acpi_host *c = dev_get_drvdata(dev); 406 407 return sdhci_runtime_suspend_host(c->host); 408 } 409 410 static int sdhci_acpi_runtime_resume(struct device *dev) 411 { 412 struct sdhci_acpi_host *c = dev_get_drvdata(dev); 413 414 return sdhci_runtime_resume_host(c->host); 415 } 416 417 static int sdhci_acpi_runtime_idle(struct device *dev) 418 { 419 return 0; 420 } 421 422 #else 423 424 #define sdhci_acpi_runtime_suspend NULL 425 #define sdhci_acpi_runtime_resume NULL 426 #define sdhci_acpi_runtime_idle NULL 427 428 #endif 429 430 static const struct dev_pm_ops sdhci_acpi_pm_ops = { 431 .suspend = sdhci_acpi_suspend, 432 .resume = sdhci_acpi_resume, 433 .runtime_suspend = sdhci_acpi_runtime_suspend, 434 .runtime_resume = sdhci_acpi_runtime_resume, 435 .runtime_idle = sdhci_acpi_runtime_idle, 436 }; 437 438 static struct platform_driver sdhci_acpi_driver = { 439 .driver = { 440 .name = "sdhci-acpi", 441 .owner = THIS_MODULE, 442 .acpi_match_table = sdhci_acpi_ids, 443 .pm = &sdhci_acpi_pm_ops, 444 }, 445 .probe = sdhci_acpi_probe, 446 .remove = sdhci_acpi_remove, 447 }; 448 449 module_platform_driver(sdhci_acpi_driver); 450 451 MODULE_DESCRIPTION("Secure Digital Host Controller Interface ACPI driver"); 452 MODULE_AUTHOR("Adrian Hunter"); 453 MODULE_LICENSE("GPL v2"); 454