[SCSI] ufs: Add Platform glue driver for ufshcd
authorVinayak Holikatti <vinholikatti@gmail.com>
Tue, 26 Feb 2013 12:34:45 +0000 (18:04 +0530)
committerJames Bottomley <JBottomley@Parallels.com>
Thu, 2 May 2013 23:16:50 +0000 (16:16 -0700)
This patch adds Platform glue driver for ufshcd.

Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Namjae Jeon <linkinjeon@gmail.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Reviewed-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
Tested-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Vinayak Holikatti <vinholikatti@gmail.com>
Signed-off-by: Santosh Yaraganavi <santoshsy@gmail.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
drivers/scsi/ufs/Kconfig
drivers/scsi/ufs/Makefile
drivers/scsi/ufs/ufshcd-pltfrm.c [new file with mode: 0644]

index 0371047c59222251971d823219e3639ac2a53ff6..35faf24c604401eeb560472542cd2ed350289d10 100644 (file)
@@ -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.
index 9eda0dfbd6df383304de10a0805868ee6485929c..1e5bd48457d636ef0aafd096f8a8038ac0dcbd5e 100644 (file)
@@ -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 (file)
index 0000000..03319ac
--- /dev/null
@@ -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);