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Janek Kotasmartinkpetersen
Janek Kotas
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martinkpetersen
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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>
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‎drivers/scsi/ufs/Kconfig

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@@ -80,6 +80,14 @@ config SCSI_UFSHCD_PLATFORM
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If unsure, say N.
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config SCSI_UFS_CDNS_PLATFORM
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tristate "Cadence UFS Controller platform driver"
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depends on SCSI_UFSHCD_PLATFORM
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help
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This selects the Cadence-specific additions to UFSHCD platform driver.
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If unsure, say N.
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config SCSI_UFS_DWC_TC_PLATFORM
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tristate "DesignWare platform support using a G210 Test Chip"
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depends on SCSI_UFSHCD_PLATFORM

‎drivers/scsi/ufs/Makefile

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# UFSHCD makefile
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obj-$(CONFIG_SCSI_UFS_DWC_TC_PCI) += tc-dwc-g210-pci.o ufshcd-dwc.o tc-dwc-g210.o
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obj-$(CONFIG_SCSI_UFS_DWC_TC_PLATFORM) += tc-dwc-g210-pltfrm.o ufshcd-dwc.o tc-dwc-g210.o
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obj-$(CONFIG_SCSI_UFS_CDNS_PLATFORM) += cdns-pltfrm.o
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obj-$(CONFIG_SCSI_UFS_QCOM) += ufs-qcom.o
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obj-$(CONFIG_SCSI_UFSHCD) += ufshcd-core.o
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ufshcd-core-y += ufshcd.o ufs-sysfs.o

‎drivers/scsi/ufs/cdns-pltfrm.c

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

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