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