3 files changed, 229 insertions, 0 deletions

diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig
index 0371047c5922..35faf24c6044 100644
--- a/drivers/scsi/ufs/Kconfig
+++ b/drivers/scsi/ufs/Kconfig
@@ -57,3 +57,14 @@ config SCSI_UFSHCD_PCI
           If you have a controller with this interface, say Y or M here.
 
           If unsure, say N.
+
+config SCSI_UFSHCD_PLATFORM
+        tristate "Platform bus based UFS Controller support"
+        depends on SCSI_UFSHCD
+        ---help---
+        This selects the UFS host controller support. Select this if
+        you have an UFS controller on Platform bus.
+
+        If you have a controller with this interface, say Y or M here.
+
+          If unsure, say N.
diff --git a/drivers/scsi/ufs/Makefile b/drivers/scsi/ufs/Makefile
index 9eda0dfbd6df..1e5bd48457d6 100644
--- a/drivers/scsi/ufs/Makefile
+++ b/drivers/scsi/ufs/Makefile
@@ -1,3 +1,4 @@
 # UFSHCD makefile
 obj-$(CONFIG_SCSI_UFSHCD) += ufshcd.o
 obj-$(CONFIG_SCSI_UFSHCD_PCI) += ufshcd-pci.o
+obj-$(CONFIG_SCSI_UFSHCD_PLATFORM) += ufshcd-pltfrm.o
diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
new file mode 100644
index 000000000000..03319acd9c72
--- /dev/null
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
@@ -0,0 +1,217 @@
+/*
+ * Universal Flash Storage Host controller Platform bus based glue driver
+ *
+ * This code is based on drivers/scsi/ufs/ufshcd-pltfrm.c
+ * Copyright (C) 2011-2013 Samsung India Software Operations
+ *
+ * Authors:
+ *      Santosh Yaraganavi <santosh.sy@samsung.com>
+ *      Vinayak Holikatti <h.vinayak@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * See the COPYING file in the top-level directory or visit
+ * <http://www.gnu.org/licenses/gpl-2.0.html>
+ *
+ * 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.
+ *
+ * This program is provided "AS IS" and "WITH ALL FAULTS" and
+ * without warranty of any kind. You are solely responsible for
+ * determining the appropriateness of using and distributing
+ * the program and assume all risks associated with your exercise
+ * of rights with respect to the program, including but not limited
+ * to infringement of third party rights, the risks and costs of
+ * program errors, damage to or loss of data, programs or equipment,
+ * and unavailability or interruption of operations. Under no
+ * circumstances will the contributor of this Program be liable for
+ * any damages of any kind arising from your use or distribution of
+ * this program.
+ */
+
+#include "ufshcd.h"
+#include <linux/platform_device.h>
+
+#ifdef CONFIG_PM
+/**
+ * ufshcd_pltfrm_suspend - suspend power management function
+ * @dev: pointer to device handle
+ *
+ *
+ * Returns 0
+ */
+static int ufshcd_pltfrm_suspend(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct ufs_hba *hba =  platform_get_drvdata(pdev);
+
+        /*
+         * TODO:
+         * 1. Call ufshcd_suspend
+         * 2. Do bus specific power management
+         */
+
+        disable_irq(hba->irq);
+
+        return 0;
+}
+
+/**
+ * ufshcd_pltfrm_resume - resume power management function
+ * @dev: pointer to device handle
+ *
+ * Returns 0
+ */
+static int ufshcd_pltfrm_resume(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct ufs_hba *hba =  platform_get_drvdata(pdev);
+
+        /*
+         * TODO:
+         * 1. Call ufshcd_resume.
+         * 2. Do bus specific wake up
+         */
+
+        enable_irq(hba->irq);
+
+        return 0;
+}
+#else
+#define ufshcd_pltfrm_suspend   NULL
+#define ufshcd_pltfrm_resume    NULL
+#endif
+
+/**
+ * ufshcd_pltfrm_probe - probe routine of the driver
+ * @pdev: pointer to Platform device handle
+ *
+ * Returns 0 on success, non-zero value on failure
+ */
+static int ufshcd_pltfrm_probe(struct platform_device *pdev)
+{
+        struct ufs_hba *hba;
+        void __iomem *mmio_base;
+        struct resource *mem_res;
+        struct resource *irq_res;
+        resource_size_t mem_size;
+        int err;
+        struct device *dev = &pdev->dev;
+
+        mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!mem_res) {
+                dev_err(&pdev->dev,
+                        "Memory resource not available\n");
+                err = -ENODEV;
+                goto out_error;
+        }
+
+        mem_size = resource_size(mem_res);
+        if (!request_mem_region(mem_res->start, mem_size, "ufshcd")) {
+                dev_err(&pdev->dev,
+                        "Cannot reserve the memory resource\n");
+                err = -EBUSY;
+                goto out_error;
+        }
+
+        mmio_base = ioremap_nocache(mem_res->start, mem_size);
+        if (!mmio_base) {
+                dev_err(&pdev->dev, "memory map failed\n");
+                err = -ENOMEM;
+                goto out_release_regions;
+        }
+
+        irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+        if (!irq_res) {
+                dev_err(&pdev->dev, "IRQ resource not available\n");
+                err = -ENODEV;
+                goto out_iounmap;
+        }
+
+        err = dma_set_coherent_mask(dev, dev->coherent_dma_mask);
+        if (err) {
+                dev_err(&pdev->dev, "set dma mask failed\n");
+                goto out_iounmap;
+        }
+
+        err = ufshcd_init(&pdev->dev, &hba, mmio_base, irq_res->start);
+        if (err) {
+                dev_err(&pdev->dev, "Intialization failed\n");
+                goto out_iounmap;
+        }
+
+        platform_set_drvdata(pdev, hba);
+
+        return 0;
+
+out_iounmap:
+        iounmap(mmio_base);
+out_release_regions:
+        release_mem_region(mem_res->start, mem_size);
+out_error:
+        return err;
+}
+
+/**
+ * ufshcd_pltfrm_remove - remove platform driver routine
+ * @pdev: pointer to platform device handle
+ *
+ * Returns 0 on success, non-zero value on failure
+ */
+static int ufshcd_pltfrm_remove(struct platform_device *pdev)
+{
+        struct resource *mem_res;
+        resource_size_t mem_size;
+        struct ufs_hba *hba =  platform_get_drvdata(pdev);
+
+        disable_irq(hba->irq);
+
+        /* Some buggy controllers raise interrupt after
+         * the resources are removed. So first we unregister the
+         * irq handler and then the resources used by driver
+         */
+
+        free_irq(hba->irq, hba);
+        ufshcd_remove(hba);
+        mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!mem_res)
+                dev_err(&pdev->dev, "ufshcd: Memory resource not available\n");
+        else {
+                mem_size = resource_size(mem_res);
+                release_mem_region(mem_res->start, mem_size);
+        }
+        platform_set_drvdata(pdev, NULL);
+        return 0;
+}
+
+static const struct of_device_id ufs_of_match[] = {
+        { .compatible = "jedec,ufs-1.1"},
+};
+
+static const struct dev_pm_ops ufshcd_dev_pm_ops = {
+        .suspend        = ufshcd_pltfrm_suspend,
+        .resume         = ufshcd_pltfrm_resume,
+};
+
+static struct platform_driver ufshcd_pltfrm_driver = {
+        .probe  = ufshcd_pltfrm_probe,
+        .remove = ufshcd_pltfrm_remove,
+        .driver = {
+                .name   = "ufshcd",
+                .owner  = THIS_MODULE,
+                .pm     = &ufshcd_dev_pm_ops,
+                .of_match_table = ufs_of_match,
+        },
+};
+
+module_platform_driver(ufshcd_pltfrm_driver);
+
+MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
+MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
+MODULE_DESCRIPTION("UFS host controller Pltform bus based glue driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(UFSHCD_DRIVER_VERSION);