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c4e05037 AH |
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 | ||
39 | #include <linux/mmc/host.h> | |
40 | #include <linux/mmc/pm.h> | |
41 | #include <linux/mmc/sdhci.h> | |
42 | ||
43 | #include "sdhci.h" | |
44 | ||
45 | enum { | |
46 | SDHCI_ACPI_SD_CD = BIT(0), | |
47 | SDHCI_ACPI_RUNTIME_PM = BIT(1), | |
48 | }; | |
49 | ||
50 | struct sdhci_acpi_chip { | |
51 | const struct sdhci_ops *ops; | |
52 | unsigned int quirks; | |
53 | unsigned int quirks2; | |
54 | unsigned long caps; | |
55 | unsigned int caps2; | |
56 | mmc_pm_flag_t pm_caps; | |
57 | }; | |
58 | ||
59 | struct sdhci_acpi_slot { | |
60 | const struct sdhci_acpi_chip *chip; | |
61 | unsigned int quirks; | |
62 | unsigned int quirks2; | |
63 | unsigned long caps; | |
64 | unsigned int caps2; | |
65 | mmc_pm_flag_t pm_caps; | |
66 | unsigned int flags; | |
67 | }; | |
68 | ||
69 | struct sdhci_acpi_host { | |
70 | struct sdhci_host *host; | |
71 | const struct sdhci_acpi_slot *slot; | |
72 | struct platform_device *pdev; | |
73 | bool use_runtime_pm; | |
74 | }; | |
75 | ||
76 | static inline bool sdhci_acpi_flag(struct sdhci_acpi_host *c, unsigned int flag) | |
77 | { | |
78 | return c->slot && (c->slot->flags & flag); | |
79 | } | |
80 | ||
81 | static int sdhci_acpi_enable_dma(struct sdhci_host *host) | |
82 | { | |
83 | return 0; | |
84 | } | |
85 | ||
86 | static const struct sdhci_ops sdhci_acpi_ops_dflt = { | |
87 | .enable_dma = sdhci_acpi_enable_dma, | |
88 | }; | |
89 | ||
e5571397 AH |
90 | static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sdio = { |
91 | .quirks2 = SDHCI_QUIRK2_HOST_OFF_CARD_ON, | |
92 | .caps = MMC_CAP_NONREMOVABLE | MMC_CAP_POWER_OFF_CARD, | |
93 | .flags = SDHCI_ACPI_RUNTIME_PM, | |
94 | .pm_caps = MMC_PM_KEEP_POWER, | |
95 | }; | |
96 | ||
c4e05037 | 97 | static const struct acpi_device_id sdhci_acpi_ids[] = { |
e5571397 | 98 | { "INT33C6", (kernel_ulong_t)&sdhci_acpi_slot_int_sdio }, |
c4e05037 AH |
99 | { "PNP0D40" }, |
100 | { }, | |
101 | }; | |
102 | MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids); | |
103 | ||
104 | static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(const char *hid) | |
105 | { | |
106 | const struct acpi_device_id *id; | |
107 | ||
108 | for (id = sdhci_acpi_ids; id->id[0]; id++) | |
109 | if (!strcmp(id->id, hid)) | |
110 | return (const struct sdhci_acpi_slot *)id->driver_data; | |
111 | return NULL; | |
112 | } | |
113 | ||
114 | static int __devinit sdhci_acpi_probe(struct platform_device *pdev) | |
115 | { | |
116 | struct device *dev = &pdev->dev; | |
117 | acpi_handle handle = ACPI_HANDLE(dev); | |
118 | struct acpi_device *device; | |
119 | struct sdhci_acpi_host *c; | |
120 | struct sdhci_host *host; | |
121 | struct resource *iomem; | |
122 | resource_size_t len; | |
123 | const char *hid; | |
124 | int err; | |
125 | ||
126 | if (acpi_bus_get_device(handle, &device)) | |
127 | return -ENODEV; | |
128 | ||
129 | if (acpi_bus_get_status(device) || !device->status.present) | |
130 | return -ENODEV; | |
131 | ||
132 | hid = acpi_device_hid(device); | |
133 | ||
134 | iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
135 | if (!iomem) | |
136 | return -ENOMEM; | |
137 | ||
138 | len = resource_size(iomem); | |
139 | if (len < 0x100) | |
140 | dev_err(dev, "Invalid iomem size!\n"); | |
141 | ||
142 | if (!devm_request_mem_region(dev, iomem->start, len, dev_name(dev))) | |
143 | return -ENOMEM; | |
144 | ||
145 | host = sdhci_alloc_host(dev, sizeof(struct sdhci_acpi_host)); | |
146 | if (IS_ERR(host)) | |
147 | return PTR_ERR(host); | |
148 | ||
149 | c = sdhci_priv(host); | |
150 | c->host = host; | |
151 | c->slot = sdhci_acpi_get_slot(hid); | |
152 | c->pdev = pdev; | |
153 | c->use_runtime_pm = sdhci_acpi_flag(c, SDHCI_ACPI_RUNTIME_PM); | |
154 | ||
155 | platform_set_drvdata(pdev, c); | |
156 | ||
157 | host->hw_name = "ACPI"; | |
158 | host->ops = &sdhci_acpi_ops_dflt; | |
159 | host->irq = platform_get_irq(pdev, 0); | |
160 | ||
161 | host->ioaddr = devm_ioremap_nocache(dev, iomem->start, | |
162 | resource_size(iomem)); | |
163 | if (host->ioaddr == NULL) { | |
164 | err = -ENOMEM; | |
165 | goto err_free; | |
166 | } | |
167 | ||
168 | if (!dev->dma_mask) { | |
169 | u64 dma_mask; | |
170 | ||
171 | if (sdhci_readl(host, SDHCI_CAPABILITIES) & SDHCI_CAN_64BIT) { | |
172 | /* 64-bit DMA is not supported at present */ | |
173 | dma_mask = DMA_BIT_MASK(32); | |
174 | } else { | |
175 | dma_mask = DMA_BIT_MASK(32); | |
176 | } | |
177 | ||
178 | dev->dma_mask = &dev->coherent_dma_mask; | |
179 | dev->coherent_dma_mask = dma_mask; | |
180 | } | |
181 | ||
182 | if (c->slot) { | |
183 | if (c->slot->chip) { | |
184 | host->ops = c->slot->chip->ops; | |
185 | host->quirks |= c->slot->chip->quirks; | |
186 | host->quirks2 |= c->slot->chip->quirks2; | |
187 | host->mmc->caps |= c->slot->chip->caps; | |
188 | host->mmc->caps2 |= c->slot->chip->caps2; | |
189 | host->mmc->pm_caps |= c->slot->chip->pm_caps; | |
190 | } | |
191 | host->quirks |= c->slot->quirks; | |
192 | host->quirks2 |= c->slot->quirks2; | |
193 | host->mmc->caps |= c->slot->caps; | |
194 | host->mmc->caps2 |= c->slot->caps2; | |
195 | host->mmc->pm_caps |= c->slot->pm_caps; | |
196 | } | |
197 | ||
198 | err = sdhci_add_host(host); | |
199 | if (err) | |
200 | goto err_free; | |
201 | ||
202 | if (c->use_runtime_pm) { | |
203 | pm_suspend_ignore_children(dev, 1); | |
204 | pm_runtime_set_autosuspend_delay(dev, 50); | |
205 | pm_runtime_use_autosuspend(dev); | |
206 | pm_runtime_enable(dev); | |
207 | } | |
208 | ||
209 | return 0; | |
210 | ||
211 | err_free: | |
212 | platform_set_drvdata(pdev, NULL); | |
213 | sdhci_free_host(c->host); | |
214 | return err; | |
215 | } | |
216 | ||
217 | static int __devexit sdhci_acpi_remove(struct platform_device *pdev) | |
218 | { | |
219 | struct sdhci_acpi_host *c = platform_get_drvdata(pdev); | |
220 | struct device *dev = &pdev->dev; | |
221 | int dead; | |
222 | ||
223 | if (c->use_runtime_pm) { | |
224 | pm_runtime_get_sync(dev); | |
225 | pm_runtime_disable(dev); | |
226 | pm_runtime_put_noidle(dev); | |
227 | } | |
228 | ||
229 | dead = (sdhci_readl(c->host, SDHCI_INT_STATUS) == ~0); | |
230 | sdhci_remove_host(c->host, dead); | |
231 | platform_set_drvdata(pdev, NULL); | |
232 | sdhci_free_host(c->host); | |
233 | ||
234 | return 0; | |
235 | } | |
236 | ||
237 | #ifdef CONFIG_PM_SLEEP | |
238 | ||
239 | static int sdhci_acpi_suspend(struct device *dev) | |
240 | { | |
241 | struct sdhci_acpi_host *c = dev_get_drvdata(dev); | |
242 | ||
243 | return sdhci_suspend_host(c->host); | |
244 | } | |
245 | ||
246 | static int sdhci_acpi_resume(struct device *dev) | |
247 | { | |
248 | struct sdhci_acpi_host *c = dev_get_drvdata(dev); | |
249 | ||
250 | return sdhci_resume_host(c->host); | |
251 | } | |
252 | ||
253 | #else | |
254 | ||
255 | #define sdhci_acpi_suspend NULL | |
256 | #define sdhci_acpi_resume NULL | |
257 | ||
258 | #endif | |
259 | ||
260 | #ifdef CONFIG_PM_RUNTIME | |
261 | ||
262 | static int sdhci_acpi_runtime_suspend(struct device *dev) | |
263 | { | |
264 | struct sdhci_acpi_host *c = dev_get_drvdata(dev); | |
265 | ||
266 | return sdhci_runtime_suspend_host(c->host); | |
267 | } | |
268 | ||
269 | static int sdhci_acpi_runtime_resume(struct device *dev) | |
270 | { | |
271 | struct sdhci_acpi_host *c = dev_get_drvdata(dev); | |
272 | ||
273 | return sdhci_runtime_resume_host(c->host); | |
274 | } | |
275 | ||
276 | static int sdhci_acpi_runtime_idle(struct device *dev) | |
277 | { | |
278 | return 0; | |
279 | } | |
280 | ||
281 | #else | |
282 | ||
283 | #define sdhci_acpi_runtime_suspend NULL | |
284 | #define sdhci_acpi_runtime_resume NULL | |
285 | #define sdhci_acpi_runtime_idle NULL | |
286 | ||
287 | #endif | |
288 | ||
289 | static const struct dev_pm_ops sdhci_acpi_pm_ops = { | |
290 | .suspend = sdhci_acpi_suspend, | |
291 | .resume = sdhci_acpi_resume, | |
292 | .runtime_suspend = sdhci_acpi_runtime_suspend, | |
293 | .runtime_resume = sdhci_acpi_runtime_resume, | |
294 | .runtime_idle = sdhci_acpi_runtime_idle, | |
295 | }; | |
296 | ||
297 | static struct platform_driver sdhci_acpi_driver = { | |
298 | .driver = { | |
299 | .name = "sdhci-acpi", | |
300 | .owner = THIS_MODULE, | |
301 | .acpi_match_table = sdhci_acpi_ids, | |
302 | .pm = &sdhci_acpi_pm_ops, | |
303 | }, | |
304 | .probe = sdhci_acpi_probe, | |
305 | .remove = __devexit_p(sdhci_acpi_remove), | |
306 | }; | |
307 | ||
308 | module_platform_driver(sdhci_acpi_driver); | |
309 | ||
310 | MODULE_DESCRIPTION("Secure Digital Host Controller Interface ACPI driver"); | |
311 | MODULE_AUTHOR("Adrian Hunter"); | |
312 | MODULE_LICENSE("GPL v2"); |