scsi: ufs: Add UFS platform driver for Cadence UFS

This patch adds a device tree platform driver for Cadence UFS Host
Controller.  It can be enabled with SCSI_UFS_CDNS_PLATFORM Kconfig option.

Signed-off-by: Jan Kotas <jank@cadence.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig
index 2ddd426..2ddbb26 100644 (file)
--- a/drivers/scsi/ufs/Kconfig
+++ b/drivers/scsi/ufs/Kconfig
@@ -80,6 +80,14 @@ config SCSI_UFSHCD_PLATFORM
 
          If unsure, say N.
 
+config SCSI_UFS_CDNS_PLATFORM
+       tristate "Cadence UFS Controller platform driver"
+       depends on SCSI_UFSHCD_PLATFORM
+       help
+       This selects the Cadence-specific additions to UFSHCD platform driver.
+
+         If unsure, say N.
+
 config SCSI_UFS_DWC_TC_PLATFORM
        tristate "DesignWare platform support using a G210 Test Chip"
        depends on SCSI_UFSHCD_PLATFORM

diff --git a/drivers/scsi/ufs/Makefile b/drivers/scsi/ufs/Makefile
index aca4813..a3bd70c 100644 (file)
--- a/drivers/scsi/ufs/Makefile
+++ b/drivers/scsi/ufs/Makefile
@@ -2,6 +2,7 @@
 # UFSHCD makefile
 obj-$(CONFIG_SCSI_UFS_DWC_TC_PCI) += tc-dwc-g210-pci.o ufshcd-dwc.o tc-dwc-g210.o
 obj-$(CONFIG_SCSI_UFS_DWC_TC_PLATFORM) += tc-dwc-g210-pltfrm.o ufshcd-dwc.o tc-dwc-g210.o
+obj-$(CONFIG_SCSI_UFS_CDNS_PLATFORM) += cdns-pltfrm.o
 obj-$(CONFIG_SCSI_UFS_QCOM) += ufs-qcom.o
 obj-$(CONFIG_SCSI_UFSHCD) += ufshcd-core.o
 ufshcd-core-y                          += ufshcd.o ufs-sysfs.o

diff --git a/drivers/scsi/ufs/cdns-pltfrm.c b/drivers/scsi/ufs/cdns-pltfrm.c
new file mode 100644 (file)
index 0000000..8bcf863
--- /dev/null
+++ b/drivers/scsi/ufs/cdns-pltfrm.c
@@ -0,0 +1,149 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Platform UFS Host driver for Cadence controller
+ *
+ * Copyright (C) 2018 Cadence Design Systems, Inc.
+ *
+ * Authors:
+ *     Jan Kotas <jank@cadence.com>
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/time.h>
+
+#include "ufshcd-pltfrm.h"
+
+#define CDNS_UFS_REG_HCLKDIV 0xFC
+
+/**
+ * Sets HCLKDIV register value based on the core_clk
+ * @hba: host controller instance
+ *
+ * Return zero for success and non-zero for failure
+ */
+static int cdns_ufs_set_hclkdiv(struct ufs_hba *hba)
+{
+       struct ufs_clk_info *clki;
+       struct list_head *head = &hba->clk_list_head;
+       unsigned long core_clk_rate = 0;
+       u32 core_clk_div = 0;
+
+       if (list_empty(head))
+               return 0;
+
+       list_for_each_entry(clki, head, list) {
+               if (IS_ERR_OR_NULL(clki->clk))
+                       continue;
+               if (!strcmp(clki->name, "core_clk"))
+                       core_clk_rate = clk_get_rate(clki->clk);
+       }
+
+       if (!core_clk_rate) {
+               dev_err(hba->dev, "%s: unable to find core_clk rate\n",
+                       __func__);
+               return -EINVAL;
+       }
+
+       core_clk_div = core_clk_rate / USEC_PER_SEC;
+
+       ufshcd_writel(hba, core_clk_div, CDNS_UFS_REG_HCLKDIV);
+       /**
+        * Make sure the register was updated,
+        * UniPro layer will not work with an incorrect value.
+        */
+       mb();
+
+       return 0;
+}
+
+/**
+ * Sets clocks used by the controller
+ * @hba: host controller instance
+ * @on: if true, enable clocks, otherwise disable
+ * @status: notify stage (pre, post change)
+ *
+ * Return zero for success and non-zero for failure
+ */
+static int cdns_ufs_setup_clocks(struct ufs_hba *hba, bool on,
+                                enum ufs_notify_change_status status)
+{
+       if ((!on) || (status == PRE_CHANGE))
+               return 0;
+
+       return cdns_ufs_set_hclkdiv(hba);
+}
+
+static struct ufs_hba_variant_ops cdns_pltfm_hba_vops = {
+       .name = "cdns-ufs-pltfm",
+       .setup_clocks = cdns_ufs_setup_clocks,
+};
+
+/**
+ * cdns_ufs_pltfrm_probe - probe routine of the driver
+ * @pdev: pointer to platform device handle
+ *
+ * Return zero for success and non-zero for failure
+ */
+static int cdns_ufs_pltfrm_probe(struct platform_device *pdev)
+{
+       int err;
+       struct device *dev = &pdev->dev;
+
+       /* Perform generic probe */
+       err = ufshcd_pltfrm_init(pdev, &cdns_pltfm_hba_vops);
+       if (err)
+               dev_err(dev, "ufshcd_pltfrm_init() failed %d\n", err);
+
+       return err;
+}
+
+/**
+ * cdns_ufs_pltfrm_remove - removes the ufs driver
+ * @pdev: pointer to platform device handle
+ *
+ * Always returns 0
+ */
+static int cdns_ufs_pltfrm_remove(struct platform_device *pdev)
+{
+       struct ufs_hba *hba =  platform_get_drvdata(pdev);
+
+       ufshcd_remove(hba);
+       return 0;
+}
+
+static const struct of_device_id cdns_ufs_of_match[] = {
+       { .compatible = "cdns,ufshc" },
+       {},
+};
+
+MODULE_DEVICE_TABLE(of, cdns_ufs_of_match);
+
+static const struct dev_pm_ops cdns_ufs_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 cdns_ufs_pltfrm_driver = {
+       .probe  = cdns_ufs_pltfrm_probe,
+       .remove = cdns_ufs_pltfrm_remove,
+       .driver = {
+               .name   = "cdns-ufshcd",
+               .owner  = THIS_MODULE,
+               .pm     = &cdns_ufs_dev_pm_ops,
+               .of_match_table = cdns_ufs_of_match,
+       },
+};
+
+module_platform_driver(cdns_ufs_pltfrm_driver);
+
+MODULE_AUTHOR("Jan Kotas <jank@cadence.com>");
+MODULE_DESCRIPTION("Cadence UFS host controller platform driver");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION(UFSHCD_DRIVER_VERSION);