scsi: ufs: make the UFS variant a platform device

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.

Reviewed-by: Rob Herring <robherring2@gmail.com>
Reviewed-by: Gilad Broner <gbroner@codeaurora.org>
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
Tested-by: Alim Akhtar <alim.akhtar@samsung.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 26 insertions, 72 deletions

diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
index 7db9564f507d..9714f2a8b329 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));
 }
+EXPORT_SYMBOL_GPL(ufshcd_pltfrm_shutdown);
 
 /**
- * ufshcd_pltfrm_probe - probe routine of the driver
+ * ufshcd_pltfrm_init - 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;
@@ -321,19 +313,19 @@ 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) {
 		dev_err(&pdev->dev, "%s: clock parse failed %d\n",
 				__func__, err);
-		goto out;
+		goto dealloc_host;
 	}
 	err = ufshcd_parse_regulator_info(hba);
 	if (err) {
 		dev_err(&pdev->dev, "%s: regulator init failed %d\n",
 				__func__, err);
-		goto out;
+		goto dealloc_host;
 	}
 
 	pm_runtime_set_active(&pdev->dev);
@@ -352,50 +344,12 @@ static int ufshcd_pltfrm_probe(struct platform_device *pdev)
 out_disable_rpm:
 	pm_runtime_disable(&pdev->dev);
 	pm_runtime_set_suspended(&pdev->dev);
+dealloc_host:
+	ufshcd_dealloc_host(hba);
 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.sy@samsung.com>");
 MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");