scsi: ufs: Add UFS platform driver for Cadence UFS (d90996da) · Commits · e / devices / android_kernel_fairphone_FP5

drivers/scsi/ufs/Kconfig

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		@@ -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

drivers/scsi/ufs/Makefile

+1 −0

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		@@ -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

drivers/scsi/ufs/cdns-pltfrm.c

0 → 100644

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		// 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);