This change turns the UFS variant (SCSI_UFS_QCOM) into a UFS
a platform device.
In order to do so a few additional changes are required:
1. The ufshcd-pltfrm is no longer serves as a platform device.
   Now it only serves as a group of platform APIs such as PM APIs
   (runtime suspend/resume, system suspend/resume etc), parsers of
   clocks, regulators and pm_levels from DT.
2. What used to be the old platform "probe" is now "only" a pltfrm_init()
   routine, that does exactly the same, but only being called by the
   new probe function of the UFS variant.

Signed-off-by: Yaniv Gardi <yga...@codeaurora.org>

---
 drivers/scsi/ufs/ufs-qcom.c      | 83 +++++++++++++++++++++++++++++++++++-
 drivers/scsi/ufs/ufshcd-pltfrm.c | 92 ++++++++++------------------------------
 drivers/scsi/ufs/ufshcd-pltfrm.h | 41 ++++++++++++++++++
 drivers/scsi/ufs/ufshcd.c        | 10 +++++
 drivers/scsi/ufs/ufshcd.h        |  1 +
 5 files changed, 156 insertions(+), 71 deletions(-)
 create mode 100644 drivers/scsi/ufs/ufshcd-pltfrm.h

diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 329ac84..725cd49 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -19,6 +19,7 @@
 
 #include <linux/phy/phy-qcom-ufs.h>
 #include "ufshcd.h"
+#include "ufshcd-pltfrm.h"
 #include "unipro.h"
 #include "ufs-qcom.h"
 #include "ufshci.h"
@@ -1036,7 +1037,7 @@ void ufs_qcom_clk_scale_notify(struct ufs_hba *hba)
  * The variant operations configure the necessary controller and PHY
  * handshake during initialization.
  */
-static const struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
+static struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
        .name                   = "qcom",
        .init                   = ufs_qcom_init,
        .exit                   = ufs_qcom_exit,
@@ -1050,4 +1051,84 @@ static const struct ufs_hba_variant_ops 
ufs_hba_qcom_vops = {
        .resume                 = ufs_qcom_resume,
 };
 
+/**
+ * ufs_qcom_probe - probe routine of the driver
+ * @pdev: pointer to Platform device handle
+ *
+ * Always return 0
+ */
+static int ufs_qcom_probe(struct platform_device *pdev)
+{
+       int err;
+       struct device *dev = &pdev->dev;
+       struct ufs_hba *hba;
+
+       /* Perform generic probe */
+       err = ufshcd_pltfrm_init(pdev, &ufs_hba_qcom_vops);
+       if (err) {
+               dev_err(dev, "ufshcd_pltfrm_init() failed %d\n", err);
+               goto out;
+       }
+
+       hba = platform_get_drvdata(pdev);
+       if (unlikely(!hba)) {
+               dev_err(dev, "no hba structure after successful probing\n");
+               goto dealloc_host;
+       }
+
+       return 0;
+
+dealloc_host:
+       /* disconnect the bind between the qcom host and the hba */
+       ufshcd_set_variant(hba, NULL);
+       ufshcd_dealloc_host(hba);
+out:
+       return err;
+}
+
+/**
+ * ufs_qcom_remove - set driver_data of the device to NULL
+ * @pdev: pointer to platform device handle
+ *
+ * Always return 0
+ */
+static int ufs_qcom_remove(struct platform_device *pdev)
+{
+       struct ufs_hba *hba =  platform_get_drvdata(pdev);
+
+       pm_runtime_get_sync(&(pdev)->dev);
+       ufshcd_remove(hba);
+       return 0;
+}
+
+static void ufs_qcom_shutdown(struct platform_device *pdev)
+{
+       ufshcd_shutdown((struct ufs_hba *)platform_get_drvdata(pdev));
+}
+
+static const struct of_device_id ufs_qcom_of_match[] = {
+       { .compatible = "qcom,ufshc"},
+       {},
+};
+
+static const struct dev_pm_ops ufs_qcom_pm_ops = {
+       .suspend        = ufshcd_pltfrm_suspend,
+       .resume         = ufshcd_pltfrm_resume,
+       .runtime_suspend = ufshcd_pltfrm_runtime_suspend,
+       .runtime_resume  = ufshcd_pltfrm_runtime_resume,
+       .runtime_idle    = ufshcd_pltfrm_runtime_idle,
+};
+
+static struct platform_driver ufs_qcom_pltform = {
+       .probe  = ufs_qcom_probe,
+       .remove = ufs_qcom_remove,
+       .shutdown = ufs_qcom_shutdown,
+       .driver = {
+               .name   = "ufshcd-qcom",
+               .pm     = &ufs_qcom_pm_ops,
+               .of_match_table = of_match_ptr(ufs_qcom_of_match),
+       },
+};
+module_platform_driver(ufs_qcom_pltform);
+
 MODULE_LICENSE("GPL v2");
diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
index 7db9564..91c73934 100644
--- a/drivers/scsi/ufs/ufshcd-pltfrm.c
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
@@ -38,20 +38,7 @@
 #include <linux/of.h>
 
 #include "ufshcd.h"
-
-static const struct of_device_id ufs_of_match[];
-static struct ufs_hba_variant_ops *get_variant_ops(struct device *dev)
-{
-       if (dev->of_node) {
-               const struct of_device_id *match;
-
-               match = of_match_node(ufs_of_match, dev->of_node);
-               if (match)
-                       return (struct ufs_hba_variant_ops *)match->data;
-       }
-
-       return NULL;
-}
+#include "ufshcd-pltfrm.h"
 
 static int ufshcd_parse_clock_info(struct ufs_hba *hba)
 {
@@ -245,10 +232,11 @@ out:
  * Returns 0 if successful
  * Returns non-zero otherwise
  */
-static int ufshcd_pltfrm_suspend(struct device *dev)
+int ufshcd_pltfrm_suspend(struct device *dev)
 {
        return ufshcd_system_suspend(dev_get_drvdata(dev));
 }
+EXPORT_SYMBOL_GPL(ufshcd_pltfrm_suspend);
 
 /**
  * ufshcd_pltfrm_resume - resume power management function
@@ -257,43 +245,47 @@ static int ufshcd_pltfrm_suspend(struct device *dev)
  * Returns 0 if successful
  * Returns non-zero otherwise
  */
-static int ufshcd_pltfrm_resume(struct device *dev)
+int ufshcd_pltfrm_resume(struct device *dev)
 {
        return ufshcd_system_resume(dev_get_drvdata(dev));
 }
+EXPORT_SYMBOL_GPL(ufshcd_pltfrm_resume);
 
-static int ufshcd_pltfrm_runtime_suspend(struct device *dev)
+int ufshcd_pltfrm_runtime_suspend(struct device *dev)
 {
        return ufshcd_runtime_suspend(dev_get_drvdata(dev));
 }
-static int ufshcd_pltfrm_runtime_resume(struct device *dev)
+EXPORT_SYMBOL_GPL(ufshcd_pltfrm_runtime_suspend);
+
+int ufshcd_pltfrm_runtime_resume(struct device *dev)
 {
        return ufshcd_runtime_resume(dev_get_drvdata(dev));
 }
-static int ufshcd_pltfrm_runtime_idle(struct device *dev)
+EXPORT_SYMBOL_GPL(ufshcd_pltfrm_runtime_resume);
+
+int ufshcd_pltfrm_runtime_idle(struct device *dev)
 {
        return ufshcd_runtime_idle(dev_get_drvdata(dev));
 }
-#else /* !CONFIG_PM */
-#define ufshcd_pltfrm_suspend  NULL
-#define ufshcd_pltfrm_resume   NULL
-#define ufshcd_pltfrm_runtime_suspend  NULL
-#define ufshcd_pltfrm_runtime_resume   NULL
-#define ufshcd_pltfrm_runtime_idle     NULL
+EXPORT_SYMBOL_GPL(ufshcd_pltfrm_runtime_idle);
+
 #endif /* CONFIG_PM */
 
-static void ufshcd_pltfrm_shutdown(struct platform_device *pdev)
+void ufshcd_pltfrm_shutdown(struct platform_device *pdev)
 {
-       ufshcd_shutdown((struct ufs_hba *)platform_get_drvdata(pdev));
+       ufshcd_shutdown((struct ufs_hba *)platform_get_drvdata(pdev));
 }
+EXPORT_SYMBOL_GPL(ufshcd_pltfrm_shutdown);
 
 /**
  * ufshcd_pltfrm_probe - probe routine of the driver
  * @pdev: pointer to Platform device handle
+ * @vops: pointer to variant ops
  *
  * Returns 0 on success, non-zero value on failure
  */
-static int ufshcd_pltfrm_probe(struct platform_device *pdev)
+int ufshcd_pltfrm_init(struct platform_device *pdev,
+                      struct ufs_hba_variant_ops *vops)
 {
        struct ufs_hba *hba;
        void __iomem *mmio_base;
@@ -321,7 +313,7 @@ static int ufshcd_pltfrm_probe(struct platform_device *pdev)
                goto out;
        }
 
-       hba->vops = get_variant_ops(&pdev->dev);
+       hba->vops = vops;
 
        err = ufshcd_parse_clock_info(hba);
        if (err) {
@@ -355,47 +347,7 @@ out_disable_rpm:
 out:
        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 ufs_hba *hba =  platform_get_drvdata(pdev);
-
-       pm_runtime_get_sync(&(pdev)->dev);
-       ufshcd_remove(hba);
-       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,
-       .runtime_suspend = ufshcd_pltfrm_runtime_suspend,
-       .runtime_resume  = ufshcd_pltfrm_runtime_resume,
-       .runtime_idle    = ufshcd_pltfrm_runtime_idle,
-};
-
-static struct platform_driver ufshcd_pltfrm_driver = {
-       .probe  = ufshcd_pltfrm_probe,
-       .remove = ufshcd_pltfrm_remove,
-       .shutdown = ufshcd_pltfrm_shutdown,
-       .driver = {
-               .name   = "ufshcd",
-               .pm     = &ufshcd_dev_pm_ops,
-               .of_match_table = ufs_of_match,
-       },
-};
-
-module_platform_driver(ufshcd_pltfrm_driver);
+EXPORT_SYMBOL_GPL(ufshcd_pltfrm_init);
 
 MODULE_AUTHOR("Santosh Yaragnavi <santosh...@samsung.com>");
 MODULE_AUTHOR("Vinayak Holikatti <h.vina...@samsung.com>");
diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.h b/drivers/scsi/ufs/ufshcd-pltfrm.h
new file mode 100644
index 0000000..df64c41
--- /dev/null
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.h
@@ -0,0 +1,41 @@
+/* Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only 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.
+ *
+ */
+
+#ifndef UFSHCD_PLTFRM_H_
+#define UFSHCD_PLTFRM_H_
+
+#include "ufshcd.h"
+
+int ufshcd_pltfrm_init(struct platform_device *pdev,
+                      struct ufs_hba_variant_ops *vops);
+void ufshcd_pltfrm_shutdown(struct platform_device *pdev);
+
+#ifdef CONFIG_PM
+
+int ufshcd_pltfrm_suspend(struct device *dev);
+int ufshcd_pltfrm_resume(struct device *dev);
+int ufshcd_pltfrm_runtime_suspend(struct device *dev);
+int ufshcd_pltfrm_runtime_resume(struct device *dev);
+int ufshcd_pltfrm_runtime_idle(struct device *dev);
+
+#else /* !CONFIG_PM */
+
+#define ufshcd_pltfrm_suspend  NULL
+#define ufshcd_pltfrm_resume   NULL
+#define ufshcd_pltfrm_runtime_suspend  NULL
+#define ufshcd_pltfrm_runtime_resume   NULL
+#define ufshcd_pltfrm_runtime_idle     NULL
+
+#endif /* CONFIG_PM */
+
+#endif /* UFSHCD_PLTFRM_H_ */
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 9e79c33..2ef9834 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -5348,6 +5348,16 @@ void ufshcd_remove(struct ufs_hba *hba)
 EXPORT_SYMBOL_GPL(ufshcd_remove);
 
 /**
+ * ufshcd_dealloc_host - deallocate Host Bus Adapter (HBA)
+ * @hba: pointer to Host Bus Adapter (HBA)
+ */
+void ufshcd_dealloc_host(struct ufs_hba *hba)
+{
+       scsi_host_put(hba->host);
+}
+EXPORT_SYMBOL_GPL(ufshcd_dealloc_host);
+
+/**
  * ufshcd_set_dma_mask - Set dma mask based on the controller
  *                      addressing capability
  * @hba: per adapter instance
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index ce75626..f2aa47e 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -576,6 +576,7 @@ static inline void ufshcd_rmwl(struct ufs_hba *hba, u32 
mask, u32 val, u32 reg)
 }
 
 int ufshcd_alloc_host(struct device *, struct ufs_hba **);
+void ufshcd_dealloc_host(struct ufs_hba *);
 int ufshcd_init(struct ufs_hba * , void __iomem * , unsigned int);
 void ufshcd_remove(struct ufs_hba *);
 
-- 
1.8.5.2

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