Adrian Hunter | c4e0503 | 2012-11-23 21:17:34 +0100 | [diff] [blame] | 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 | |
Adrian Hunter | e557139 | 2012-12-10 21:18:48 +0100 | [diff] [blame^] | 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 | |
Adrian Hunter | c4e0503 | 2012-11-23 21:17:34 +0100 | [diff] [blame] | 97 | static const struct acpi_device_id sdhci_acpi_ids[] = { |
Adrian Hunter | e557139 | 2012-12-10 21:18:48 +0100 | [diff] [blame^] | 98 | { "INT33C6", (kernel_ulong_t)&sdhci_acpi_slot_int_sdio }, |
Adrian Hunter | c4e0503 | 2012-11-23 21:17:34 +0100 | [diff] [blame] | 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"); |