xref: /openbmc/linux/drivers/mmc/host/sdhci-acpi.c (revision 206204a1) 
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/interrupt.h>
35 #include <linux/acpi.h>
36 #include <linux/pm.h>
37 #include <linux/pm_runtime.h>
38 #include <linux/delay.h>
39 
40 #include <linux/mmc/host.h>
41 #include <linux/mmc/pm.h>
42 #include <linux/mmc/slot-gpio.h>
43 #include <linux/mmc/sdhci.h>
44 
45 #include "sdhci.h"
46 
47 enum {
48 	SDHCI_ACPI_SD_CD		= BIT(0),
49 	SDHCI_ACPI_RUNTIME_PM		= BIT(1),
50 	SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL	= BIT(2),
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 	.set_clock = sdhci_set_clock,
106 	.enable_dma = sdhci_acpi_enable_dma,
107 	.set_bus_width = sdhci_set_bus_width,
108 	.reset = sdhci_reset,
109 	.set_uhs_signaling = sdhci_set_uhs_signaling,
110 };
111 
112 static const struct sdhci_ops sdhci_acpi_ops_int = {
113 	.set_clock = sdhci_set_clock,
114 	.enable_dma = sdhci_acpi_enable_dma,
115 	.set_bus_width = sdhci_set_bus_width,
116 	.reset = sdhci_reset,
117 	.set_uhs_signaling = sdhci_set_uhs_signaling,
118 	.hw_reset   = sdhci_acpi_int_hw_reset,
119 };
120 
121 static const struct sdhci_acpi_chip sdhci_acpi_chip_int = {
122 	.ops = &sdhci_acpi_ops_int,
123 };
124 
125 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = {
126 	.chip    = &sdhci_acpi_chip_int,
127 	.caps    = MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE | MMC_CAP_HW_RESET,
128 	.caps2   = MMC_CAP2_HC_ERASE_SZ,
129 	.flags   = SDHCI_ACPI_RUNTIME_PM,
130 };
131 
132 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sdio = {
133 	.quirks  = SDHCI_QUIRK_BROKEN_CARD_DETECTION,
134 	.quirks2 = SDHCI_QUIRK2_HOST_OFF_CARD_ON,
135 	.caps    = MMC_CAP_NONREMOVABLE | MMC_CAP_POWER_OFF_CARD,
136 	.flags   = SDHCI_ACPI_RUNTIME_PM,
137 	.pm_caps = MMC_PM_KEEP_POWER,
138 };
139 
140 static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sd = {
141 	.flags   = SDHCI_ACPI_SD_CD | SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL |
142 		   SDHCI_ACPI_RUNTIME_PM,
143 	.quirks2 = SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON,
144 };
145 
146 struct sdhci_acpi_uid_slot {
147 	const char *hid;
148 	const char *uid;
149 	const struct sdhci_acpi_slot *slot;
150 };
151 
152 static const struct sdhci_acpi_uid_slot sdhci_acpi_uids[] = {
153 	{ "80860F14" , "1" , &sdhci_acpi_slot_int_emmc },
154 	{ "80860F14" , "3" , &sdhci_acpi_slot_int_sd   },
155 	{ "80860F16" , NULL, &sdhci_acpi_slot_int_sd   },
156 	{ "INT33BB"  , "2" , &sdhci_acpi_slot_int_sdio },
157 	{ "INT33C6"  , NULL, &sdhci_acpi_slot_int_sdio },
158 	{ "INT3436"  , NULL, &sdhci_acpi_slot_int_sdio },
159 	{ "PNP0D40"  },
160 	{ },
161 };
162 
163 static const struct acpi_device_id sdhci_acpi_ids[] = {
164 	{ "80860F14" },
165 	{ "80860F16" },
166 	{ "INT33BB"  },
167 	{ "INT33C6"  },
168 	{ "INT3436"  },
169 	{ "PNP0D40"  },
170 	{ },
171 };
172 MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids);
173 
174 static const struct sdhci_acpi_slot *sdhci_acpi_get_slot_by_ids(const char *hid,
175 								const char *uid)
176 {
177 	const struct sdhci_acpi_uid_slot *u;
178 
179 	for (u = sdhci_acpi_uids; u->hid; u++) {
180 		if (strcmp(u->hid, hid))
181 			continue;
182 		if (!u->uid)
183 			return u->slot;
184 		if (uid && !strcmp(u->uid, uid))
185 			return u->slot;
186 	}
187 	return NULL;
188 }
189 
190 static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(acpi_handle handle,
191 							 const char *hid)
192 {
193 	const struct sdhci_acpi_slot *slot;
194 	struct acpi_device_info *info;
195 	const char *uid = NULL;
196 	acpi_status status;
197 
198 	status = acpi_get_object_info(handle, &info);
199 	if (!ACPI_FAILURE(status) && (info->valid & ACPI_VALID_UID))
200 		uid = info->unique_id.string;
201 
202 	slot = sdhci_acpi_get_slot_by_ids(hid, uid);
203 
204 	kfree(info);
205 	return slot;
206 }
207 
208 static int sdhci_acpi_probe(struct platform_device *pdev)
209 {
210 	struct device *dev = &pdev->dev;
211 	acpi_handle handle = ACPI_HANDLE(dev);
212 	struct acpi_device *device;
213 	struct sdhci_acpi_host *c;
214 	struct sdhci_host *host;
215 	struct resource *iomem;
216 	resource_size_t len;
217 	const char *hid;
218 	int err;
219 
220 	if (acpi_bus_get_device(handle, &device))
221 		return -ENODEV;
222 
223 	if (acpi_bus_get_status(device) || !device->status.present)
224 		return -ENODEV;
225 
226 	hid = acpi_device_hid(device);
227 
228 	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
229 	if (!iomem)
230 		return -ENOMEM;
231 
232 	len = resource_size(iomem);
233 	if (len < 0x100)
234 		dev_err(dev, "Invalid iomem size!\n");
235 
236 	if (!devm_request_mem_region(dev, iomem->start, len, dev_name(dev)))
237 		return -ENOMEM;
238 
239 	host = sdhci_alloc_host(dev, sizeof(struct sdhci_acpi_host));
240 	if (IS_ERR(host))
241 		return PTR_ERR(host);
242 
243 	c = sdhci_priv(host);
244 	c->host = host;
245 	c->slot = sdhci_acpi_get_slot(handle, hid);
246 	c->pdev = pdev;
247 	c->use_runtime_pm = sdhci_acpi_flag(c, SDHCI_ACPI_RUNTIME_PM);
248 
249 	platform_set_drvdata(pdev, c);
250 
251 	host->hw_name	= "ACPI";
252 	host->ops	= &sdhci_acpi_ops_dflt;
253 	host->irq	= platform_get_irq(pdev, 0);
254 
255 	host->ioaddr = devm_ioremap_nocache(dev, iomem->start,
256 					    resource_size(iomem));
257 	if (host->ioaddr == NULL) {
258 		err = -ENOMEM;
259 		goto err_free;
260 	}
261 
262 	if (!dev->dma_mask) {
263 		u64 dma_mask;
264 
265 		if (sdhci_readl(host, SDHCI_CAPABILITIES) & SDHCI_CAN_64BIT) {
266 			/* 64-bit DMA is not supported at present */
267 			dma_mask = DMA_BIT_MASK(32);
268 		} else {
269 			dma_mask = DMA_BIT_MASK(32);
270 		}
271 
272 		err = dma_coerce_mask_and_coherent(dev, dma_mask);
273 		if (err)
274 			goto err_free;
275 	}
276 
277 	if (c->slot) {
278 		if (c->slot->chip) {
279 			host->ops            = c->slot->chip->ops;
280 			host->quirks        |= c->slot->chip->quirks;
281 			host->quirks2       |= c->slot->chip->quirks2;
282 			host->mmc->caps     |= c->slot->chip->caps;
283 			host->mmc->caps2    |= c->slot->chip->caps2;
284 			host->mmc->pm_caps  |= c->slot->chip->pm_caps;
285 		}
286 		host->quirks        |= c->slot->quirks;
287 		host->quirks2       |= c->slot->quirks2;
288 		host->mmc->caps     |= c->slot->caps;
289 		host->mmc->caps2    |= c->slot->caps2;
290 		host->mmc->pm_caps  |= c->slot->pm_caps;
291 	}
292 
293 	host->mmc->caps2 |= MMC_CAP2_NO_PRESCAN_POWERUP;
294 
295 	if (sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD)) {
296 		bool v = sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL);
297 
298 		if (mmc_gpiod_request_cd(host->mmc, NULL, 0, v, 0)) {
299 			dev_warn(dev, "failed to setup card detect gpio\n");
300 			c->use_runtime_pm = false;
301 		}
302 	}
303 
304 	err = sdhci_add_host(host);
305 	if (err)
306 		goto err_free;
307 
308 	if (c->use_runtime_pm) {
309 		pm_runtime_set_active(dev);
310 		pm_suspend_ignore_children(dev, 1);
311 		pm_runtime_set_autosuspend_delay(dev, 50);
312 		pm_runtime_use_autosuspend(dev);
313 		pm_runtime_enable(dev);
314 	}
315 
316 	return 0;
317 
318 err_free:
319 	sdhci_free_host(c->host);
320 	return err;
321 }
322 
323 static int sdhci_acpi_remove(struct platform_device *pdev)
324 {
325 	struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
326 	struct device *dev = &pdev->dev;
327 	int dead;
328 
329 	if (c->use_runtime_pm) {
330 		pm_runtime_get_sync(dev);
331 		pm_runtime_disable(dev);
332 		pm_runtime_put_noidle(dev);
333 	}
334 
335 	dead = (sdhci_readl(c->host, SDHCI_INT_STATUS) == ~0);
336 	sdhci_remove_host(c->host, dead);
337 	sdhci_free_host(c->host);
338 
339 	return 0;
340 }
341 
342 #ifdef CONFIG_PM_SLEEP
343 
344 static int sdhci_acpi_suspend(struct device *dev)
345 {
346 	struct sdhci_acpi_host *c = dev_get_drvdata(dev);
347 
348 	return sdhci_suspend_host(c->host);
349 }
350 
351 static int sdhci_acpi_resume(struct device *dev)
352 {
353 	struct sdhci_acpi_host *c = dev_get_drvdata(dev);
354 
355 	return sdhci_resume_host(c->host);
356 }
357 
358 #else
359 
360 #define sdhci_acpi_suspend	NULL
361 #define sdhci_acpi_resume	NULL
362 
363 #endif
364 
365 #ifdef CONFIG_PM_RUNTIME
366 
367 static int sdhci_acpi_runtime_suspend(struct device *dev)
368 {
369 	struct sdhci_acpi_host *c = dev_get_drvdata(dev);
370 
371 	return sdhci_runtime_suspend_host(c->host);
372 }
373 
374 static int sdhci_acpi_runtime_resume(struct device *dev)
375 {
376 	struct sdhci_acpi_host *c = dev_get_drvdata(dev);
377 
378 	return sdhci_runtime_resume_host(c->host);
379 }
380 
381 static int sdhci_acpi_runtime_idle(struct device *dev)
382 {
383 	return 0;
384 }
385 
386 #else
387 
388 #define sdhci_acpi_runtime_suspend	NULL
389 #define sdhci_acpi_runtime_resume	NULL
390 #define sdhci_acpi_runtime_idle		NULL
391 
392 #endif
393 
394 static const struct dev_pm_ops sdhci_acpi_pm_ops = {
395 	.suspend		= sdhci_acpi_suspend,
396 	.resume			= sdhci_acpi_resume,
397 	.runtime_suspend	= sdhci_acpi_runtime_suspend,
398 	.runtime_resume		= sdhci_acpi_runtime_resume,
399 	.runtime_idle		= sdhci_acpi_runtime_idle,
400 };
401 
402 static struct platform_driver sdhci_acpi_driver = {
403 	.driver = {
404 		.name			= "sdhci-acpi",
405 		.owner			= THIS_MODULE,
406 		.acpi_match_table	= sdhci_acpi_ids,
407 		.pm			= &sdhci_acpi_pm_ops,
408 	},
409 	.probe	= sdhci_acpi_probe,
410 	.remove	= sdhci_acpi_remove,
411 };
412 
413 module_platform_driver(sdhci_acpi_driver);
414 
415 MODULE_DESCRIPTION("Secure Digital Host Controller Interface ACPI driver");
416 MODULE_AUTHOR("Adrian Hunter");
417 MODULE_LICENSE("GPL v2");
418