[SCSI] ufs: Separate PCI code into glue driver

This patch separates PCI code from ufshcd.c and makes it as a
core driver module and adds a new file ufshcd-pci.c as PCI glue
driver.

[jejb: strip __devinit and devexit_p()]
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Namjae Jeon <linkinjeon@gmail.com>
Reviewed-by: Subhash Jadavani <subhashj@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>

5 files changed, 440 insertions, 327 deletions

diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig
index 8ee40dff3dfb..0371047c5922 100644
--- a/drivers/scsi/ufs/Kconfig
+++ b/drivers/scsi/ufs/Kconfig
@@ -33,7 +33,27 @@
 # this program.
 
 config SCSI_UFSHCD
-        tristate "Universal Flash Storage host controller driver"
-        depends on PCI && SCSI
+        tristate "Universal Flash Storage Controller Driver Core"
+        depends on SCSI
         ---help---
-        This is a generic driver which supports PCIe UFS Host controllers.
+        This selects the support for UFS devices in Linux, say Y and make
+          sure that you know the name of your UFS host adapter (the card
+          inside your computer that "speaks" the UFS protocol, also
+          called UFS Host Controller), because you will be asked for it.
+          The module will be called ufshcd.
+
+          To compile this driver as a module, choose M here and read
+          <file:Documentation/scsi/ufs.txt>.
+          However, do not compile this as a module if your root file system
+          (the one containing the directory /) is located on a UFS device.
+
+config SCSI_UFSHCD_PCI
+        tristate "PCI bus based UFS Controller support"
+        depends on SCSI_UFSHCD && PCI
+        ---help---
+        This selects the PCI UFS Host Controller Interface. Select this if
+        you have UFS Host Controller with PCI Interface.
+
+          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 adf7895a6a91..9eda0dfbd6df 100644
--- a/drivers/scsi/ufs/Makefile
+++ b/drivers/scsi/ufs/Makefile
@@ -1,2 +1,3 @@
 # UFSHCD makefile
 obj-$(CONFIG_SCSI_UFSHCD) += ufshcd.o
+obj-$(CONFIG_SCSI_UFSHCD_PCI) += ufshcd-pci.o
diff --git a/drivers/scsi/ufs/ufshcd-pci.c b/drivers/scsi/ufs/ufshcd-pci.c
new file mode 100644
index 000000000000..5cb1d75f5868
--- /dev/null
+++ b/drivers/scsi/ufs/ufshcd-pci.c
@@ -0,0 +1,211 @@
+/*
+ * Universal Flash Storage Host controller PCI glue driver
+ *
+ * This code is based on drivers/scsi/ufs/ufshcd-pci.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/pci.h>
+
+#ifdef CONFIG_PM
+/**
+ * ufshcd_pci_suspend - suspend power management function
+ * @pdev: pointer to PCI device handle
+ * @state: power state
+ *
+ * Returns -ENOSYS
+ */
+static int ufshcd_pci_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+        /*
+         * TODO:
+         * 1. Call ufshcd_suspend
+         * 2. Do bus specific power management
+         */
+
+        return -ENOSYS;
+}
+
+/**
+ * ufshcd_pci_resume - resume power management function
+ * @pdev: pointer to PCI device handle
+ *
+ * Returns -ENOSYS
+ */
+static int ufshcd_pci_resume(struct pci_dev *pdev)
+{
+        /*
+         * TODO:
+         * 1. Call ufshcd_resume.
+         * 2. Do bus specific wake up
+         */
+
+        return -ENOSYS;
+}
+#endif /* CONFIG_PM */
+
+/**
+ * ufshcd_pci_shutdown - main function to put the controller in reset state
+ * @pdev: pointer to PCI device handle
+ */
+static void ufshcd_pci_shutdown(struct pci_dev *pdev)
+{
+        ufshcd_hba_stop((struct ufs_hba *)pci_get_drvdata(pdev));
+}
+
+/**
+ * ufshcd_pci_remove - de-allocate PCI/SCSI host and host memory space
+ *              data structure memory
+ * @pdev - pointer to PCI handle
+ */
+static void ufshcd_pci_remove(struct pci_dev *pdev)
+{
+        struct ufs_hba *hba = pci_get_drvdata(pdev);
+
+        disable_irq(pdev->irq);
+        free_irq(pdev->irq, hba);
+        ufshcd_remove(hba);
+        pci_release_regions(pdev);
+        pci_set_drvdata(pdev, NULL);
+        pci_clear_master(pdev);
+        pci_disable_device(pdev);
+}
+
+/**
+ * ufshcd_set_dma_mask - Set dma mask based on the controller
+ *                       addressing capability
+ * @pdev: PCI device structure
+ *
+ * Returns 0 for success, non-zero for failure
+ */
+static int ufshcd_set_dma_mask(struct pci_dev *pdev)
+{
+        int err;
+
+        if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))
+                && !pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)))
+                return 0;
+        err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+        if (!err)
+                err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
+        return err;
+}
+
+/**
+ * ufshcd_pci_probe - probe routine of the driver
+ * @pdev: pointer to PCI device handle
+ * @id: PCI device id
+ *
+ * Returns 0 on success, non-zero value on failure
+ */
+static int
+ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+        struct ufs_hba *hba;
+        void __iomem *mmio_base;
+        int err;
+
+        err = pci_enable_device(pdev);
+        if (err) {
+                dev_err(&pdev->dev, "pci_enable_device failed\n");
+                goto out_error;
+        }
+
+        pci_set_master(pdev);
+
+
+        err = pci_request_regions(pdev, UFSHCD);
+        if (err < 0) {
+                dev_err(&pdev->dev, "request regions failed\n");
+                goto out_disable;