// 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/clk.h>#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 0 xFC#define CDNS_UFS_REG_PHY_XCFGD1 0 x113C#define CDNS_UFS_MAX_L4_ATTRS 12 struct cdns_ufs_host {/** * cdns_ufs_dme_attr_val - for storing L4 attributes /** * cdns_ufs_get_l4_attr - get L4 attributes on local side * @ hba : per adapter instance * static void cdns_ufs_get_l4_attr(struct ufs_hba *hba)struct cdns_ufs_host *host = ufshcd_get_variant(hba);0 ]);1 ]);2 ]);3 ]);4 ]);5 ]);6 ]);7 ]);8 ]);9 ]);10 ]);11 ]);/** * cdns_ufs_set_l4_attr - set L4 attributes on local side * @ hba : per adapter instance * static void cdns_ufs_set_l4_attr(struct ufs_hba *hba)struct cdns_ufs_host *host = ufshcd_get_variant(hba);0 );0 ]);1 ]);2 ]);3 ]);4 ]);5 ]);6 ]);7 ]);8 ]);9 ]);10 ]);11 ]);/** * cdns_ufs_set_hclkdiv ( ) - set 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 ;0 ;if (list_empty(head))return 0 ;if (IS_ERR_OR_NULL(clki->clk))continue ;if (!strcmp(clki->name, "core_clk" ))if (!core_clk_rate) {"%s: unable to find core_clk rate\n" ,return -EINVAL;/** * Make sure the register was updated , * UniPro layer will not work with an incorrect value . return 0 ;/** * cdns_ufs_hce_enable_notify ( ) - set HCLKDIV register * @ 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);/** * cdns_ufs_hibern8_notify ( ) - save and restore L4 attributes . * @ hba : host controller instance * @ cmd : UIC Command * @ status : notify stage ( pre , post change ) static void cdns_ufs_hibern8_notify(struct ufs_hba *hba, enum uic_cmd_dme cmd,enum ufs_notify_change_status status)if (status == PRE_CHANGE && cmd == UIC_CMD_DME_HIBER_ENTER)if (status == POST_CHANGE && cmd == UIC_CMD_DME_HIBER_EXIT)/** * cdns_ufs_link_startup_notify ( ) - handle link startup . * @ 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 . /* * Disabling Autohibern8 feature in cadence UFS * to mask unexpected interrupt trigger . 0 ;return 0 ;/** * cdns_ufs_init - performs additional ufs initialization * @ hba : host controller instance * * Return : status of initialization . static int cdns_ufs_init(struct ufs_hba *hba)int status = 0 ;struct cdns_ufs_host *host;struct device *dev = hba->dev;sizeof (*host), GFP_KERNEL);if (!host)return -ENOMEM;return status;/** * cdns_ufs_m31_16nm_phy_initialization - performs m31 phy initialization * @ hba : host controller instance * * Return : 0 ( success ) . static int cdns_ufs_m31_16nm_phy_initialization(struct ufs_hba *hba)/* Increase RX_Advanced_Min_ActivateTime_Capability */ 24 );return 0 ;static const struct ufs_hba_variant_ops cdns_ufs_pltfm_hba_vops = {"cdns-ufs-pltfm" ,static const struct ufs_hba_variant_ops cdns_ufs_m31_16nm_pltfm_hba_vops = {"cdns-ufs-pltfm" ,static const struct of_device_id cdns_ufs_of_match[] = {"cdns,ufshc" ,"cdns,ufshc-m31-16nm" ,/** * 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;struct ufs_hba_variant_ops *)of_id->data;/* Perform generic probe */ if (err)"ufshcd_pltfrm_init() failed %d\n" , err);return err;/** * cdns_ufs_pltfrm_remove - removes the ufs driver * @ pdev : pointer to platform device handle * * Return : 0 ( success ) . static void cdns_ufs_pltfrm_remove(struct platform_device *pdev)static const struct dev_pm_ops cdns_ufs_dev_pm_ops = {static struct platform_driver cdns_ufs_pltfrm_driver = {"cdns-ufshcd" ,"Jan Kotas <jank@cadence.com>" );"Cadence UFS host controller platform driver" );"GPL v2" );
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