sdhci: platform driver for SDHCI

Added a platform driver which uses the SDHCI core.

Signed-off-by: Richard Röjfors <richard.rojfors.ext@mocean-labs.com>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>

3 files changed, 180 insertions, 0 deletions

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 75337e442da9..b1cf79083fdd 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -83,6 +83,17 @@ config MMC_SDHCI_OF
 
           If unsure, say N.
 
+config MMC_SDHCI_PLTFM
+        tristate "SDHCI support on the platform specific bus"
+        depends on MMC_SDHCI
+        help
+          This selects the platform specific bus support for Secure Digital Host
+          Controller Interface.
+
+          If you have a controller with this interface, say Y or M here.
+
+          If unsure, say N.
+
 config MMC_OMAP
         tristate "TI OMAP Multimedia Card Interface support"
         depends on ARCH_OMAP
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index ce9c8b6f0f4b..254e441291d0 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_MMC_SDHCI)		+= sdhci.o
 obj-$(CONFIG_MMC_SDHCI_PCI)     += sdhci-pci.o
 obj-$(CONFIG_MMC_RICOH_MMC)     += ricoh_mmc.o
 obj-$(CONFIG_MMC_SDHCI_OF)      += sdhci-of.o
+obj-$(CONFIG_MMC_SDHCI_PLTFM)   += sdhci-pltfm.o
 obj-$(CONFIG_MMC_WBSD)          += wbsd.o
 obj-$(CONFIG_MMC_AU1X)          += au1xmmc.o
 obj-$(CONFIG_MMC_OMAP)          += omap.o
diff --git a/drivers/mmc/host/sdhci-pltfm.c b/drivers/mmc/host/sdhci-pltfm.c
new file mode 100644
index 000000000000..297f40ae6ad5
--- /dev/null
+++ b/drivers/mmc/host/sdhci-pltfm.c
@@ -0,0 +1,168 @@
+/*
+ * sdhci-pltfm.c Support for SDHCI platform devices
+ * Copyright (c) 2009 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/* Supports:
+ * SDHCI platform devices
+ *
+ * Inspired by sdhci-pci.c, by Pierre Ossman
+ */
+
+#include <linux/delay.h>
+#include <linux/highmem.h>
+#include <linux/platform_device.h>
+
+#include <linux/mmc/host.h>
+
+#include <linux/io.h>
+
+#include "sdhci.h"
+
+/*****************************************************************************\
+ *                                                                           *
+ * SDHCI core callbacks                                                      *
+ *                                                                           *
+\*****************************************************************************/
+
+static struct sdhci_ops sdhci_pltfm_ops = {
+};
+
+/*****************************************************************************\
+ *                                                                           *
+ * Device probing/removal                                                    *
+ *                                                                           *
+\*****************************************************************************/
+
+static int __devinit sdhci_pltfm_probe(struct platform_device *pdev)
+{
+        struct sdhci_host *host;
+        struct resource *iomem;
+        int ret;
+
+        BUG_ON(pdev == NULL);
+
+        iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!iomem) {
+                ret = -ENOMEM;
+                goto err;
+        }
+
+        if (resource_size(iomem) != 0x100)
+                dev_err(&pdev->dev, "Invalid iomem size. You may "
+                        "experience problems.\n");
+
+        if (pdev->dev.parent)
+                host = sdhci_alloc_host(pdev->dev.parent, 0);
+        else
+                host = sdhci_alloc_host(&pdev->dev, 0);
+
+        if (IS_ERR(host)) {
+                ret = PTR_ERR(host);
+                goto err;
+        }
+
+        host->hw_name = "platform";
+        host->ops = &sdhci_pltfm_ops;
+        host->irq = platform_get_irq(pdev, 0);
+
+        if (!request_mem_region(iomem->start, resource_size(iomem),
+                mmc_hostname(host->mmc))) {
+                dev_err(&pdev->dev, "cannot request region\n");
+                ret = -EBUSY;
+                goto err_request;
+        }
+
+        host->ioaddr = ioremap(iomem->start, resource_size(iomem));
+        if (!host->ioaddr) {
+                dev_err(&pdev->dev, "failed to remap registers\n");
+                ret = -ENOMEM;
+                goto err_remap;
+        }
+
+        ret = sdhci_add_host(host);
+        if (ret)
+                goto err_add_host;
+
+        platform_set_drvdata(pdev, host);
+
+        return 0;
+
+err_add_host:
+        iounmap(host->ioaddr);
+err_remap:
+        release_mem_region(iomem->start, resource_size(iomem));
+err_request:
+        sdhci_free_host(host);
+err:
+        printk(KERN_ERR"Probing of sdhci-pltfm failed: %d\n", ret);
+        return ret;
+}
+
+static int __devexit sdhci_pltfm_remove(struct platform_device *pdev)
+{
+        struct sdhci_host *host = platform_get_drvdata(pdev);
+        struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        int dead;
+        u32 scratch;
+
+        dead = 0;
+        scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
+        if (scratch == (u32)-1)
+                dead = 1;
+
+        sdhci_remove_host(host, dead);
+        iounmap(host->ioaddr);
+        release_mem_region(iomem->start, resource_size(iomem));
+        sdhci_free_host(host);
+        platform_set_drvdata(pdev, NULL);
+
+        return 0;
+}
+
+static struct platform_driver sdhci_pltfm_driver = {
+        .driver = {
+                .name   = "sdhci",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = sdhci_pltfm_probe,
+        .remove         = __devexit_p(sdhci_pltfm_remove),
+};
+
+/*****************************************************************************\
+ *                                                                           *
+ * Driver init/exit                                                          *
+ *                                                                           *
+\*****************************************************************************/
+
+static int __init sdhci_drv_init(void)
+{
+        return platform_driver_register(&sdhci_pltfm_driver);
+}
+
+static void __exit sdhci_drv_exit(void)
+{
+        platform_driver_unregister(&sdhci_pltfm_driver);
+}
+
+module_init(sdhci_drv_init);
+module_exit(sdhci_drv_exit);
+
+MODULE_DESCRIPTION("Secure Digital Host Controller Interface platform driver");
+MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:sdhci");
+