2 * Secure Digital Host Controller Interface ACPI driver.
4 * Copyright (c) 2012, Intel Corporation.
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.
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
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.
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>
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/consumer.h>
35 #include <linux/interrupt.h>
36 #include <linux/acpi.h>
38 #include <linux/pm_runtime.h>
39 #include <linux/delay.h>
41 #include <linux/mmc/host.h>
42 #include <linux/mmc/pm.h>
43 #include <linux/mmc/sdhci.h>
48 SDHCI_ACPI_SD_CD = BIT(0),
49 SDHCI_ACPI_RUNTIME_PM = BIT(1),
52 struct sdhci_acpi_chip {
53 const struct sdhci_ops *ops;
58 mmc_pm_flag_t pm_caps;
61 struct sdhci_acpi_slot {
62 const struct sdhci_acpi_chip *chip;
67 mmc_pm_flag_t pm_caps;
71 struct sdhci_acpi_host {
72 struct sdhci_host *host;
73 const struct sdhci_acpi_slot *slot;
74 struct platform_device *pdev;
78 static inline bool sdhci_acpi_flag(struct sdhci_acpi_host *c, unsigned int flag)
80 return c->slot && (c->slot->flags & flag);
83 static int sdhci_acpi_enable_dma(struct sdhci_host *host)
88 static void sdhci_acpi_int_hw_reset(struct sdhci_host *host)
92 reg = sdhci_readb(host, SDHCI_POWER_CONTROL);
94 sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
95 /* For eMMC, minimum is 1us but give it 9us for good measure */
98 sdhci_writeb(host, reg, SDHCI_POWER_CONTROL);
99 /* For eMMC, minimum is 200us but give it 300us for good measure */
100 usleep_range(300, 1000);
103 static const struct sdhci_ops sdhci_acpi_ops_dflt = {
104 .enable_dma = sdhci_acpi_enable_dma,
107 static const struct sdhci_ops sdhci_acpi_ops_int = {
108 .enable_dma = sdhci_acpi_enable_dma,
109 .hw_reset = sdhci_acpi_int_hw_reset,
112 static const struct sdhci_acpi_chip sdhci_acpi_chip_int = {
113 .ops = &sdhci_acpi_ops_int,
116 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = {
117 .chip = &sdhci_acpi_chip_int,
118 .caps = MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE | MMC_CAP_HW_RESET,
119 .caps2 = MMC_CAP2_HC_ERASE_SZ,
120 .flags = SDHCI_ACPI_RUNTIME_PM,
123 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sdio = {
124 .quirks2 = SDHCI_QUIRK2_HOST_OFF_CARD_ON,
125 .caps = MMC_CAP_NONREMOVABLE | MMC_CAP_POWER_OFF_CARD,
126 .flags = SDHCI_ACPI_RUNTIME_PM,
127 .pm_caps = MMC_PM_KEEP_POWER,
130 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sd = {
131 .flags = SDHCI_ACPI_SD_CD | SDHCI_ACPI_RUNTIME_PM,
132 .quirks2 = SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON,
135 struct sdhci_acpi_uid_slot {
138 const struct sdhci_acpi_slot *slot;
141 static const struct sdhci_acpi_uid_slot sdhci_acpi_uids[] = {
142 { "80860F14" , "1" , &sdhci_acpi_slot_int_emmc },
143 { "80860F14" , "3" , &sdhci_acpi_slot_int_sd },
144 { "INT33BB" , "2" , &sdhci_acpi_slot_int_sdio },
145 { "INT33C6" , NULL, &sdhci_acpi_slot_int_sdio },
150 static const struct acpi_device_id sdhci_acpi_ids[] = {
157 MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids);
159 static const struct sdhci_acpi_slot *sdhci_acpi_get_slot_by_ids(const char *hid,
162 const struct sdhci_acpi_uid_slot *u;
164 for (u = sdhci_acpi_uids; u->hid; u++) {
165 if (strcmp(u->hid, hid))
169 if (uid && !strcmp(u->uid, uid))
175 static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(acpi_handle handle,
178 const struct sdhci_acpi_slot *slot;
179 struct acpi_device_info *info;
180 const char *uid = NULL;
183 status = acpi_get_object_info(handle, &info);
184 if (!ACPI_FAILURE(status) && (info->valid & ACPI_VALID_UID))
185 uid = info->unique_id.string;
187 slot = sdhci_acpi_get_slot_by_ids(hid, uid);
193 #ifdef CONFIG_PM_RUNTIME
195 static irqreturn_t sdhci_acpi_sd_cd(int irq, void *dev_id)
197 mmc_detect_change(dev_id, msecs_to_jiffies(200));
201 static int sdhci_acpi_add_own_cd(struct device *dev, struct mmc_host *mmc)
203 struct gpio_desc *desc;
207 desc = devm_gpiod_get_index(dev, "sd_cd", 0);
213 err = gpiod_direction_input(desc);
217 irq = gpiod_to_irq(desc);
223 flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
224 err = devm_request_irq(dev, irq, sdhci_acpi_sd_cd, flags, "sd_cd", mmc);
231 devm_gpiod_put(dev, desc);
233 dev_warn(dev, "failed to setup card detect wake up\n");
239 static int sdhci_acpi_add_own_cd(struct device *dev, struct mmc_host *mmc)
246 static int sdhci_acpi_probe(struct platform_device *pdev)
248 struct device *dev = &pdev->dev;
249 acpi_handle handle = ACPI_HANDLE(dev);
250 struct acpi_device *device;
251 struct sdhci_acpi_host *c;
252 struct sdhci_host *host;
253 struct resource *iomem;
258 if (acpi_bus_get_device(handle, &device))
261 if (acpi_bus_get_status(device) || !device->status.present)
264 hid = acpi_device_hid(device);
266 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
270 len = resource_size(iomem);
272 dev_err(dev, "Invalid iomem size!\n");
274 if (!devm_request_mem_region(dev, iomem->start, len, dev_name(dev)))
277 host = sdhci_alloc_host(dev, sizeof(struct sdhci_acpi_host));
279 return PTR_ERR(host);
281 c = sdhci_priv(host);
283 c->slot = sdhci_acpi_get_slot(handle, hid);
285 c->use_runtime_pm = sdhci_acpi_flag(c, SDHCI_ACPI_RUNTIME_PM);
287 platform_set_drvdata(pdev, c);
289 host->hw_name = "ACPI";
290 host->ops = &sdhci_acpi_ops_dflt;
291 host->irq = platform_get_irq(pdev, 0);
293 host->ioaddr = devm_ioremap_nocache(dev, iomem->start,
294 resource_size(iomem));
295 if (host->ioaddr == NULL) {
300 if (!dev->dma_mask) {
303 if (sdhci_readl(host, SDHCI_CAPABILITIES) & SDHCI_CAN_64BIT) {
304 /* 64-bit DMA is not supported at present */
305 dma_mask = DMA_BIT_MASK(32);
307 dma_mask = DMA_BIT_MASK(32);
310 err = dma_coerce_mask_and_coherent(dev, dma_mask);
317 host->ops = c->slot->chip->ops;
318 host->quirks |= c->slot->chip->quirks;
319 host->quirks2 |= c->slot->chip->quirks2;
320 host->mmc->caps |= c->slot->chip->caps;
321 host->mmc->caps2 |= c->slot->chip->caps2;
322 host->mmc->pm_caps |= c->slot->chip->pm_caps;
324 host->quirks |= c->slot->quirks;
325 host->quirks2 |= c->slot->quirks2;
326 host->mmc->caps |= c->slot->caps;
327 host->mmc->caps2 |= c->slot->caps2;
328 host->mmc->pm_caps |= c->slot->pm_caps;
331 host->mmc->caps2 |= MMC_CAP2_NO_PRESCAN_POWERUP;
333 err = sdhci_add_host(host);
337 if (sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD)) {
338 if (sdhci_acpi_add_own_cd(dev, host->mmc))
339 c->use_runtime_pm = false;
342 if (c->use_runtime_pm) {
343 pm_runtime_set_active(dev);
344 pm_suspend_ignore_children(dev, 1);
345 pm_runtime_set_autosuspend_delay(dev, 50);
346 pm_runtime_use_autosuspend(dev);
347 pm_runtime_enable(dev);
353 sdhci_free_host(c->host);
357 static int sdhci_acpi_remove(struct platform_device *pdev)
359 struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
360 struct device *dev = &pdev->dev;
363 if (c->use_runtime_pm) {
364 pm_runtime_get_sync(dev);
365 pm_runtime_disable(dev);
366 pm_runtime_put_noidle(dev);
369 dead = (sdhci_readl(c->host, SDHCI_INT_STATUS) == ~0);
370 sdhci_remove_host(c->host, dead);
371 sdhci_free_host(c->host);
376 #ifdef CONFIG_PM_SLEEP
378 static int sdhci_acpi_suspend(struct device *dev)
380 struct sdhci_acpi_host *c = dev_get_drvdata(dev);
382 return sdhci_suspend_host(c->host);
385 static int sdhci_acpi_resume(struct device *dev)
387 struct sdhci_acpi_host *c = dev_get_drvdata(dev);
389 return sdhci_resume_host(c->host);
394 #define sdhci_acpi_suspend NULL
395 #define sdhci_acpi_resume NULL
399 #ifdef CONFIG_PM_RUNTIME
401 static int sdhci_acpi_runtime_suspend(struct device *dev)
403 struct sdhci_acpi_host *c = dev_get_drvdata(dev);
405 return sdhci_runtime_suspend_host(c->host);
408 static int sdhci_acpi_runtime_resume(struct device *dev)
410 struct sdhci_acpi_host *c = dev_get_drvdata(dev);
412 return sdhci_runtime_resume_host(c->host);
415 static int sdhci_acpi_runtime_idle(struct device *dev)
422 #define sdhci_acpi_runtime_suspend NULL
423 #define sdhci_acpi_runtime_resume NULL
424 #define sdhci_acpi_runtime_idle NULL
428 static const struct dev_pm_ops sdhci_acpi_pm_ops = {
429 .suspend = sdhci_acpi_suspend,
430 .resume = sdhci_acpi_resume,
431 .runtime_suspend = sdhci_acpi_runtime_suspend,
432 .runtime_resume = sdhci_acpi_runtime_resume,
433 .runtime_idle = sdhci_acpi_runtime_idle,
436 static struct platform_driver sdhci_acpi_driver = {
438 .name = "sdhci-acpi",
439 .owner = THIS_MODULE,
440 .acpi_match_table = sdhci_acpi_ids,
441 .pm = &sdhci_acpi_pm_ops,
443 .probe = sdhci_acpi_probe,
444 .remove = sdhci_acpi_remove,
447 module_platform_driver(sdhci_acpi_driver);
449 MODULE_DESCRIPTION("Secure Digital Host Controller Interface ACPI driver");
450 MODULE_AUTHOR("Adrian Hunter");
451 MODULE_LICENSE("GPL v2");