Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/scsi/ufs/cdns-pltfrm.c b/drivers/scsi/ufs/cdns-pltfrm.c
new file mode 100644
index 0000000..b2af04c
--- /dev/null
+++ b/drivers/scsi/ufs/cdns-pltfrm.c
@@ -0,0 +1,228 @@
+// 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
+#define CDNS_UFS_REG_PHY_XCFGD1 0x113C
+
+/**
+ * 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;
+}
+
+/**
+ * Called before and after HCE enable bit is set.
+ * @hba: host controller instance
+ * @status: notify stage (pre, post change)
+ *
+ * Return zero for success and non-zero for failure
+ */
+static int cdns_ufs_hce_enable_notify(struct ufs_hba *hba,
+ enum ufs_notify_change_status status)
+{
+ if (status != PRE_CHANGE)
+ return 0;
+
+ return cdns_ufs_set_hclkdiv(hba);
+}
+
+/**
+ * Called before and after Link startup is carried out.
+ * @hba: host controller instance
+ * @status: notify stage (pre, post change)
+ *
+ * Return zero for success and non-zero for failure
+ */
+static int cdns_ufs_link_startup_notify(struct ufs_hba *hba,
+ enum ufs_notify_change_status status)
+{
+ if (status != PRE_CHANGE)
+ return 0;
+
+ /*
+ * Some UFS devices have issues if LCC is enabled.
+ * So we are setting PA_Local_TX_LCC_Enable to 0
+ * before link startup which will make sure that both host
+ * and device TX LCC are disabled once link startup is
+ * completed.
+ */
+ ufshcd_dme_set(hba, UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE), 0);
+
+ return 0;
+}
+
+/**
+ * cdns_ufs_init - performs additional ufs initialization
+ * @hba: host controller instance
+ *
+ * Returns status of initialization
+ */
+static int cdns_ufs_init(struct ufs_hba *hba)
+{
+ int status = 0;
+
+ if (hba->vops && hba->vops->phy_initialization)
+ status = hba->vops->phy_initialization(hba);
+
+ return status;
+}
+
+/**
+ * cdns_ufs_m31_16nm_phy_initialization - performs m31 phy initialization
+ * @hba: host controller instance
+ *
+ * Always returns 0
+ */
+static int cdns_ufs_m31_16nm_phy_initialization(struct ufs_hba *hba)
+{
+ u32 data;
+
+ /* Increase RX_Advanced_Min_ActivateTime_Capability */
+ data = ufshcd_readl(hba, CDNS_UFS_REG_PHY_XCFGD1);
+ data |= BIT(24);
+ ufshcd_writel(hba, data, CDNS_UFS_REG_PHY_XCFGD1);
+
+ return 0;
+}
+
+static const struct ufs_hba_variant_ops cdns_ufs_pltfm_hba_vops = {
+ .name = "cdns-ufs-pltfm",
+ .hce_enable_notify = cdns_ufs_hce_enable_notify,
+ .link_startup_notify = cdns_ufs_link_startup_notify,
+};
+
+static const struct ufs_hba_variant_ops cdns_ufs_m31_16nm_pltfm_hba_vops = {
+ .name = "cdns-ufs-pltfm",
+ .init = cdns_ufs_init,
+ .hce_enable_notify = cdns_ufs_hce_enable_notify,
+ .link_startup_notify = cdns_ufs_link_startup_notify,
+ .phy_initialization = cdns_ufs_m31_16nm_phy_initialization,
+};
+
+static const struct of_device_id cdns_ufs_of_match[] = {
+ {
+ .compatible = "cdns,ufshc",
+ .data = &cdns_ufs_pltfm_hba_vops,
+ },
+ {
+ .compatible = "cdns,ufshc-m31-16nm",
+ .data = &cdns_ufs_m31_16nm_pltfm_hba_vops,
+ },
+ { },
+};
+
+MODULE_DEVICE_TABLE(of, cdns_ufs_of_match);
+
+/**
+ * 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;
+ const struct of_device_id *of_id;
+ struct ufs_hba_variant_ops *vops;
+ struct device *dev = &pdev->dev;
+
+ of_id = of_match_node(cdns_ufs_of_match, dev->of_node);
+ vops = (struct ufs_hba_variant_ops *)of_id->data;
+
+ /* Perform generic probe */
+ err = ufshcd_pltfrm_init(pdev, 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 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",
+ .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);