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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
47enum {
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
53struct 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
62struct 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
72struct 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
79static inline bool sdhci_acpi_flag(struct sdhci_acpi_host *c, unsigned int flag)
80{
81 return c->slot && (c->slot->flags & flag);
82}
83
84static int sdhci_acpi_enable_dma(struct sdhci_host *host)
85{
86 return 0;
87}
88
89static 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
104static const struct sdhci_ops sdhci_acpi_ops_dflt = {
105 .enable_dma = sdhci_acpi_enable_dma,
106};
107
108static 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
113static const struct sdhci_acpi_chip sdhci_acpi_chip_int = {
114 .ops = &sdhci_acpi_ops_int,
115};
116
117static 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
124static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sdio = {
125 .quirks = SDHCI_QUIRK_BROKEN_CARD_DETECTION,
126 .quirks2 = SDHCI_QUIRK2_HOST_OFF_CARD_ON,
127 .caps = MMC_CAP_NONREMOVABLE | MMC_CAP_POWER_OFF_CARD,
128 .flags = SDHCI_ACPI_RUNTIME_PM,
129 .pm_caps = MMC_PM_KEEP_POWER,
130};
131
132static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sd = {
133 .flags = SDHCI_ACPI_SD_CD | SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL |
134 SDHCI_ACPI_RUNTIME_PM,
135 .quirks2 = SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON,
136};
137
138struct sdhci_acpi_uid_slot {
139 const char *hid;
140 const char *uid;
141 const struct sdhci_acpi_slot *slot;
142};
143
144static const struct sdhci_acpi_uid_slot sdhci_acpi_uids[] = {
145 { "80860F14" , "1" , &sdhci_acpi_slot_int_emmc },
146 { "80860F14" , "3" , &sdhci_acpi_slot_int_sd },
147 { "80860F16" , NULL, &sdhci_acpi_slot_int_sd },
148 { "INT33BB" , "2" , &sdhci_acpi_slot_int_sdio },
149 { "INT33C6" , NULL, &sdhci_acpi_slot_int_sdio },
150 { "INT3436" , NULL, &sdhci_acpi_slot_int_sdio },
151 { "PNP0D40" },
152 { },
153};
154
155static const struct acpi_device_id sdhci_acpi_ids[] = {
156 { "80860F14" },
157 { "80860F16" },
158 { "INT33BB" },
159 { "INT33C6" },
160 { "INT3436" },
161 { "PNP0D40" },
162 { },
163};
164MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids);
165
166static const struct sdhci_acpi_slot *sdhci_acpi_get_slot_by_ids(const char *hid,
167 const char *uid)
168{
169 const struct sdhci_acpi_uid_slot *u;
170
171 for (u = sdhci_acpi_uids; u->hid; u++) {
172 if (strcmp(u->hid, hid))
173 continue;
174 if (!u->uid)
175 return u->slot;
176 if (uid && !strcmp(u->uid, uid))
177 return u->slot;
178 }
179 return NULL;
180}
181
182static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(acpi_handle handle,
183 const char *hid)
184{
185 const struct sdhci_acpi_slot *slot;
186 struct acpi_device_info *info;
187 const char *uid = NULL;
188 acpi_status status;
189
190 status = acpi_get_object_info(handle, &info);
191 if (!ACPI_FAILURE(status) && (info->valid & ACPI_VALID_UID))
192 uid = info->unique_id.string;
193
194 slot = sdhci_acpi_get_slot_by_ids(hid, uid);
195
196 kfree(info);
197 return slot;
198}
199
200static int sdhci_acpi_probe(struct platform_device *pdev)
201{
202 struct device *dev = &pdev->dev;
203 acpi_handle handle = ACPI_HANDLE(dev);
204 struct acpi_device *device;
205 struct sdhci_acpi_host *c;
206 struct sdhci_host *host;
207 struct resource *iomem;
208 resource_size_t len;
209 const char *hid;
210 int err;
211
212 if (acpi_bus_get_device(handle, &device))
213 return -ENODEV;
214
215 if (acpi_bus_get_status(device) || !device->status.present)
216 return -ENODEV;
217
218 hid = acpi_device_hid(device);
219
220 iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
221 if (!iomem)
222 return -ENOMEM;
223
224 len = resource_size(iomem);
225 if (len < 0x100)
226 dev_err(dev, "Invalid iomem size!\n");
227
228 if (!devm_request_mem_region(dev, iomem->start, len, dev_name(dev)))
229 return -ENOMEM;
230
231 host = sdhci_alloc_host(dev, sizeof(struct sdhci_acpi_host));
232 if (IS_ERR(host))
233 return PTR_ERR(host);
234
235 c = sdhci_priv(host);
236 c->host = host;
237 c->slot = sdhci_acpi_get_slot(handle, hid);
238 c->pdev = pdev;
239 c->use_runtime_pm = sdhci_acpi_flag(c, SDHCI_ACPI_RUNTIME_PM);
240
241 platform_set_drvdata(pdev, c);
242
243 host->hw_name = "ACPI";
244 host->ops = &sdhci_acpi_ops_dflt;
245 host->irq = platform_get_irq(pdev, 0);
246
247 host->ioaddr = devm_ioremap_nocache(dev, iomem->start,
248 resource_size(iomem));
249 if (host->ioaddr == NULL) {
250 err = -ENOMEM;
251 goto err_free;
252 }
253
254 if (!dev->dma_mask) {
255 u64 dma_mask;
256
257 if (sdhci_readl(host, SDHCI_CAPABILITIES) & SDHCI_CAN_64BIT) {
258 /* 64-bit DMA is not supported at present */
259 dma_mask = DMA_BIT_MASK(32);
260 } else {
261 dma_mask = DMA_BIT_MASK(32);
262 }
263
264 err = dma_coerce_mask_and_coherent(dev, dma_mask);
265 if (err)
266 goto err_free;
267 }
268
269 if (c->slot) {
270 if (c->slot->chip) {
271 host->ops = c->slot->chip->ops;
272 host->quirks |= c->slot->chip->quirks;
273 host->quirks2 |= c->slot->chip->quirks2;
274 host->mmc->caps |= c->slot->chip->caps;
275 host->mmc->caps2 |= c->slot->chip->caps2;
276 host->mmc->pm_caps |= c->slot->chip->pm_caps;
277 }
278 host->quirks |= c->slot->quirks;
279 host->quirks2 |= c->slot->quirks2;
280 host->mmc->caps |= c->slot->caps;
281 host->mmc->caps2 |= c->slot->caps2;
282 host->mmc->pm_caps |= c->slot->pm_caps;
283 }
284
285 host->mmc->caps2 |= MMC_CAP2_NO_PRESCAN_POWERUP;
286
287 if (sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD)) {
288 bool v = sdhci_acpi_flag(c, SDHCI_ACPI_SD_CD_OVERRIDE_LEVEL);
289
290 if (mmc_gpiod_request_cd(host->mmc, NULL, 0, v, 0)) {
291 dev_warn(dev, "failed to setup card detect gpio\n");
292 c->use_runtime_pm = false;
293 }
294 }
295
296 err = sdhci_add_host(host);
297 if (err)
298 goto err_free;
299
300 if (c->use_runtime_pm) {
301 pm_runtime_set_active(dev);
302 pm_suspend_ignore_children(dev, 1);
303 pm_runtime_set_autosuspend_delay(dev, 50);
304 pm_runtime_use_autosuspend(dev);
305 pm_runtime_enable(dev);
306 }
307
308 return 0;
309
310err_free:
311 sdhci_free_host(c->host);
312 return err;
313}
314
315static int sdhci_acpi_remove(struct platform_device *pdev)
316{
317 struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
318 struct device *dev = &pdev->dev;
319 int dead;
320
321 if (c->use_runtime_pm) {
322 pm_runtime_get_sync(dev);
323 pm_runtime_disable(dev);
324 pm_runtime_put_noidle(dev);
325 }
326
327 dead = (sdhci_readl(c->host, SDHCI_INT_STATUS) == ~0);
328 sdhci_remove_host(c->host, dead);
329 sdhci_free_host(c->host);
330
331 return 0;
332}
333
334#ifdef CONFIG_PM_SLEEP
335
336static int sdhci_acpi_suspend(struct device *dev)
337{
338 struct sdhci_acpi_host *c = dev_get_drvdata(dev);
339
340 return sdhci_suspend_host(c->host);
341}
342
343static int sdhci_acpi_resume(struct device *dev)
344{
345 struct sdhci_acpi_host *c = dev_get_drvdata(dev);
346
347 return sdhci_resume_host(c->host);
348}
349
350#else
351
352#define sdhci_acpi_suspend NULL
353#define sdhci_acpi_resume NULL
354
355#endif
356
357#ifdef CONFIG_PM_RUNTIME
358
359static int sdhci_acpi_runtime_suspend(struct device *dev)
360{
361 struct sdhci_acpi_host *c = dev_get_drvdata(dev);
362
363 return sdhci_runtime_suspend_host(c->host);
364}
365
366static int sdhci_acpi_runtime_resume(struct device *dev)
367{
368 struct sdhci_acpi_host *c = dev_get_drvdata(dev);
369
370 return sdhci_runtime_resume_host(c->host);
371}
372
373static int sdhci_acpi_runtime_idle(struct device *dev)
374{
375 return 0;
376}
377
378#else
379
380#define sdhci_acpi_runtime_suspend NULL
381#define sdhci_acpi_runtime_resume NULL
382#define sdhci_acpi_runtime_idle NULL
383
384#endif
385
386static const struct dev_pm_ops sdhci_acpi_pm_ops = {
387 .suspend = sdhci_acpi_suspend,
388 .resume = sdhci_acpi_resume,
389 .runtime_suspend = sdhci_acpi_runtime_suspend,
390 .runtime_resume = sdhci_acpi_runtime_resume,
391 .runtime_idle = sdhci_acpi_runtime_idle,
392};
393
394static struct platform_driver sdhci_acpi_driver = {
395 .driver = {
396 .name = "sdhci-acpi",
397 .owner = THIS_MODULE,
398 .acpi_match_table = sdhci_acpi_ids,
399 .pm = &sdhci_acpi_pm_ops,
400 },
401 .probe = sdhci_acpi_probe,
402 .remove = sdhci_acpi_remove,
403};
404
405module_platform_driver(sdhci_acpi_driver);
406
407MODULE_DESCRIPTION("Secure Digital Host Controller Interface ACPI driver");
408MODULE_AUTHOR("Adrian Hunter");
409MODULE_LICENSE("GPL v2");