mmc: sdhci-acpi: add SDHCI ACPI driver

Add a driver for SDHCI controllers enumerated via ACPI and identified
by the ACPI Compatibility ID PNP0D40 (or other SDHCI-specific ACPI
hardware IDs in the future).

[rjw: Added the changelog.]
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Chris Ball <cjb@laptop.org>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

3 files changed, 317 insertions, 0 deletions

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 9bf10e7bbfaf..56eac101c013 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -81,6 +81,18 @@ config MMC_RICOH_MMC
 
           If unsure, say Y.
 
+config MMC_SDHCI_ACPI
+        tristate "SDHCI support for ACPI enumerated SDHCI controllers"
+        depends on MMC_SDHCI && ACPI
+        help
+          This selects support for ACPI enumerated SDHCI controllers,
+          identified by ACPI Compatibility ID PNP0D40 or specific
+          ACPI Hardware IDs.
+
+          If you have a controller with this interface, say Y or M here.
+
+          If unsure, say N.
+
 config MMC_SDHCI_PLTFM
         tristate "SDHCI platform and OF driver helper"
         depends on MMC_SDHCI
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 17ad0a7ba40b..0e4960a107de 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_MMC_MXS)		+= mxs-mmc.o
 obj-$(CONFIG_MMC_SDHCI)         += sdhci.o
 obj-$(CONFIG_MMC_SDHCI_PCI)     += sdhci-pci.o
 obj-$(subst m,y,$(CONFIG_MMC_SDHCI_PCI))        += sdhci-pci-data.o
+obj-$(CONFIG_MMC_SDHCI_ACPI)    += sdhci-acpi.o
 obj-$(CONFIG_MMC_SDHCI_PXAV3)   += sdhci-pxav3.o
 obj-$(CONFIG_MMC_SDHCI_PXAV2)   += sdhci-pxav2.o
 obj-$(CONFIG_MMC_SDHCI_S3C)     += sdhci-s3c.o
diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
new file mode 100644
index 000000000000..6ac361744d36
--- /dev/null
+++ b/drivers/mmc/host/sdhci-acpi.c
@@ -0,0 +1,304 @@
+/*
+ * Secure Digital Host Controller Interface ACPI driver.
+ *
+ * Copyright (c) 2012, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/export.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/dma-mapping.h>
+#include <linux/compiler.h>
+#include <linux/stddef.h>
+#include <linux/bitops.h>
+#include <linux/types.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/acpi.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
+
+#include <linux/mmc/host.h>
+#include <linux/mmc/pm.h>
+#include <linux/mmc/sdhci.h>
+
+#include "sdhci.h"
+
+enum {
+        SDHCI_ACPI_SD_CD        = BIT(0),
+        SDHCI_ACPI_RUNTIME_PM   = BIT(1),
+};
+
+struct sdhci_acpi_chip {
+        const struct    sdhci_ops *ops;
+        unsigned int    quirks;
+        unsigned int    quirks2;
+        unsigned long   caps;
+        unsigned int    caps2;
+        mmc_pm_flag_t   pm_caps;
+};
+
+struct sdhci_acpi_slot {
+        const struct    sdhci_acpi_chip *chip;
+        unsigned int    quirks;
+        unsigned int    quirks2;
+        unsigned long   caps;
+        unsigned int    caps2;
+        mmc_pm_flag_t   pm_caps;
+        unsigned int    flags;
+};
+
+struct sdhci_acpi_host {
+        struct sdhci_host               *host;
+        const struct sdhci_acpi_slot    *slot;
+        struct platform_device          *pdev;
+        bool                            use_runtime_pm;
+};
+
+static inline bool sdhci_acpi_flag(struct sdhci_acpi_host *c, unsigned int flag)
+{
+        return c->slot && (c->slot->flags & flag);
+}
+
+static int sdhci_acpi_enable_dma(struct sdhci_host *host)
+{
+        return 0;
+}
+
+static const struct sdhci_ops sdhci_acpi_ops_dflt = {
+        .enable_dma = sdhci_acpi_enable_dma,
+};
+
+static const struct acpi_device_id sdhci_acpi_ids[] = {
+        { "PNP0D40" },
+        { },
+};
+MODULE_DEVICE_TABLE(acpi, sdhci_acpi_ids);
+
+static const struct sdhci_acpi_slot *sdhci_acpi_get_slot(const char *hid)
+{
+        const struct acpi_device_id *id;
+
+        for (id = sdhci_acpi_ids; id->id[0]; id++)
+                if (!strcmp(id->id, hid))
+                        return (const struct sdhci_acpi_slot *)id->driver_data;
+        return NULL;
+}
+
+static int __devinit sdhci_acpi_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        acpi_handle handle = ACPI_HANDLE(dev);
+        struct acpi_device *device;
+        struct sdhci_acpi_host *c;
+        struct sdhci_host *host;
+        struct resource *iomem;
+        resource_size_t len;
+        const char *hid;
+        int err;
+
+        if (acpi_bus_get_device(handle, &device))
+                return -ENODEV;
+
+        if (acpi_bus_get_status(device) || !device->status.present)
+                return -ENODEV;
+
+        hid = acpi_device_hid(device);
+
+        iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!iomem)
+                return -ENOMEM;
+
+        len = resource_size(iomem);
+        if (len < 0x100)
+                dev_err(dev, "Invalid iomem size!\n");
+
+        if (!devm_request_mem_region(dev, iomem->start, len, dev_name(dev)))
+                return -ENOMEM;
+
+        host = sdhci_alloc_host(dev, sizeof(struct sdhci_acpi_host));
+        if (IS_ERR(host))
+                return PTR_ERR(host);
+
+        c = sdhci_priv(host);
+        c->host = host;
+        c->slot = sdhci_acpi_get_slot(hid);
+        c->pdev = pdev;
+        c->use_runtime_pm = sdhci_acpi_flag(c, SDHCI_ACPI_RUNTIME_PM);
+
+        platform_set_drvdata(pdev, c);
+
+        host->hw_name   = "ACPI";
+        host->ops       = &sdhci_acpi_ops_dflt;
+        host->irq       = platform_get_irq(pdev, 0);
+
+        host->ioaddr = devm_ioremap_nocache(dev, iomem->start,
+                                            resource_size(iomem));
+        if (host->ioaddr == NULL) {
+                err = -ENOMEM;
+                goto err_free;
+        }
+
+        if (!dev->dma_mask) {
+                u64 dma_mask;
+
+                if (sdhci_readl(host, SDHCI_CAPABILITIES) & SDHCI_CAN_64BIT) {
+                        /* 64-bit DMA is not supported at present */
+                        dma_mask = DMA_BIT_MASK(32);
+                } else {
+                        dma_mask = DMA_BIT_MASK(32);
+                }
+
+                dev->dma_mask = &dev->coherent_dma_mask;
+                dev->coherent_dma_mask = dma_mask;
+        }
+
+        if (c->slot) {
+                if (c->slot->chip) {
+                        host->ops            = c->slot->chip->ops;
+                        host->quirks        |= c->slot->chip->quirks;
+                        host->quirks2       |= c->slot->chip->quirks2;
+                        host->mmc->caps     |= c->slot->chip->caps;
+                        host->mmc->caps2    |= c->slot->chip->caps2;
+                        host->mmc->pm_caps  |= c->slot->chip->pm_caps;
+                }
+                host->quirks        |= c->slot->quirks;
+                host->quirks2       |= c->slot->quirks2;
+                host->mmc->caps     |= c->slot->caps;
+                host->mmc->caps2    |= c->slot->caps2;
+                host->mmc->pm_caps  |= c->slot->pm_caps;
+        }
+
+        err = sdhci_add_host(host);
+        if (err)
+                goto err_free;
+
+        if (c->use_runtime_pm) {
+                pm_suspend_ignore_children(dev, 1);
+                pm_runtime_set_autosuspend_delay(dev, 50);
+                pm_runtime_use_autosuspend(dev);
+                pm_runtime_enable(dev);
+        }
+
+        return 0;
+
+err_free:
+        platform_set_drvdata(pdev, NULL);
+        sdhci_free_host(c->host);
+        return err;
+}
+
+static int __devexit sdhci_acpi_remove(struct platform_device *pdev)
+{
+        struct sdhci_acpi_host *c = platform_get_drvdata(pdev);
+        struct device *dev = &pdev->dev;
+        int dead;
+
+        if (c->use_runtime_pm) {
+                pm_runtime_get_sync(dev);
+                pm_runtime_disable(dev);
+                pm_runtime_put_noidle(dev);
+        }
+
+        dead = (sdhci_readl(c->host, SDHCI_INT_STATUS) == ~0);
+        sdhci_remove_host(c->host, dead);
+        platform_set_drvdata(pdev, NULL);
+        sdhci_free_host(c->host);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+
+static int sdhci_acpi_suspend(struct device *dev)
+{
+        struct sdhci_acpi_host *c = dev_get_drvdata(dev);
+
+        return sdhci_suspend_host(c->host);
+}
+
+static int sdhci_acpi_resume(struct device *dev)
+{
+        struct sdhci_acpi_host *c = dev_get_drvdata(dev);
+
+        return sdhci_resume_host(c->host);
+}
+
+#else
+
+#define sdhci_acpi_suspend      NULL
+#define sdhci_acpi_resume       NULL
+
+#endif
+
+#ifdef CONFIG_PM_RUNTIME
+
+static int sdhci_acpi_runtime_suspend(struct device *dev)
+{
+        struct sdhci_acpi_host *c = dev_get_drvdata(dev);
+
+        return sdhci_runtime_suspend_host(c->host);
+}
+
+static int sdhci_acpi_runtime_resume(struct device *dev)
+{
+        struct sdhci_acpi_host *c = dev_get_drvdata(dev);
+
+        return sdhci_runtime_resume_host(c->host);
+}
+
+static int sdhci_acpi_runtime_idle(struct device *dev)
+{
+        return 0;
+}
+
+#else
+
+#define sdhci_acpi_runtime_suspend      NULL
+#define sdhci_acpi_runtime_resume       NULL
+#define sdhci_acpi_runtime_idle         NULL
+
+#endif
+
+static const struct dev_pm_ops sdhci_acpi_pm_ops = {
+        .suspend                = sdhci_acpi_suspend,
+        .resume                 = sdhci_acpi_resume,
+        .runtime_suspend        = sdhci_acpi_runtime_suspend,
+        .runtime_resume         = sdhci_acpi_runtime_resume,
+        .runtime_idle           = sdhci_acpi_runtime_idle,
+};
+
+static struct platform_driver sdhci_acpi_driver = {
+        .driver = {
+                .name                   = "sdhci-acpi",
+                .owner                  = THIS_MODULE,
+                .acpi_match_table       = sdhci_acpi_ids,
+                .pm                     = &sdhci_acpi_pm_ops,
+        },
+        .probe  = sdhci_acpi_probe,
+        .remove = __devexit_p(sdhci_acpi_remove),
+};
+
+module_platform_driver(sdhci_acpi_driver);
+
+MODULE_DESCRIPTION("Secure Digital Host Controller Interface ACPI driver");
+MODULE_AUTHOR("Adrian Hunter");
+MODULE_LICENSE("GPL v2");