[PATCH 3/3] mmc: sdhci-acpi: add SDHCI ACPI driver

Adrian Hunter
2012-11-22T19:05:17Z

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
drivers/mmc/host/Kconfig | 12 ++
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/sdhci-acpi.c | 304 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 317 insertions(+)
create mode 100644 drivers/mmc/host/sdhci-acpi.c

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 9bf10e7..56eac10 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 17ad0a7..0e4960a 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 0000000..f582fe7
--- /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 = dev->acpi_handle;
+ 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");
--
1.7.11.7