drivers/ufs/cdns-platform.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /**
   3  * cdns-platform.c - Platform driver for Cadence UFSHCI device
   4  *
   5  * Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
   6  */
   7
   8 #include <clk.h>
   9 #include <common.h>
  10 #include <dm.h>
  11 #include <ufs.h>
  12 #include <linux/err.h>
  13
  14 #include "ufs.h"
  15
  16 #define USEC_PER_SEC    1000000L
  17
  18 #define CDNS_UFS_REG_HCLKDIV    0xFC
  19 #define CDNS_UFS_REG_PHY_XCFGD1 0x113C
  20
  21 static int cdns_ufs_link_startup_notify(struct ufs_hba *hba,
  22                                         enum ufs_notify_change_status status)
  23 {
  24         hba->quirks |= UFSHCD_QUIRK_BROKEN_LCC;
  25         switch (status) {
  26         case PRE_CHANGE:
  27                 return ufshcd_dme_set(hba,
  28                                       UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE),
  29                                       0);
  30         case POST_CHANGE:
  31         ;
  32         }
  33
  34         return 0;
  35 }
  36
  37 static int cdns_ufs_set_hclkdiv(struct ufs_hba *hba)
  38 {
  39         struct clk clk;
  40         unsigned long core_clk_rate = 0;
  41         u32 core_clk_div = 0;
  42         int ret;
  43
  44         ret = clk_get_by_name(hba->dev, "core_clk", &clk);
  45         if (ret) {
  46                 dev_err(hba->dev, "failed to get core_clk clock\n");
  47                 return ret;
  48         }
  49
  50         core_clk_rate = clk_get_rate(&clk);
  51         if (IS_ERR_VALUE(core_clk_rate)) {
  52                 dev_err(hba->dev, "%s: unable to find core_clk rate\n",
  53                         __func__);
  54                 return core_clk_rate;
  55         }
  56
  57         core_clk_div = core_clk_rate / USEC_PER_SEC;
  58         ufshcd_writel(hba, core_clk_div, CDNS_UFS_REG_HCLKDIV);
  59
  60         return 0;
  61 }
  62
  63 static int cdns_ufs_hce_enable_notify(struct ufs_hba *hba,
  64                                       enum ufs_notify_change_status status)
  65 {
  66         switch (status) {
  67         case PRE_CHANGE:
  68                 return cdns_ufs_set_hclkdiv(hba);
  69         case POST_CHANGE:
  70         ;
  71         }
  72
  73         return 0;
  74 }
  75
  76 static int cdns_ufs_init(struct ufs_hba *hba)
  77 {
  78         u32 data;
  79
  80         /* Increase RX_Advanced_Min_ActivateTime_Capability */
  81         data = ufshcd_readl(hba, CDNS_UFS_REG_PHY_XCFGD1);
  82         data |= BIT(24);
  83         ufshcd_writel(hba, data, CDNS_UFS_REG_PHY_XCFGD1);
  84
  85         return 0;
  86 }
  87
  88 static struct ufs_hba_ops cdns_pltfm_hba_ops = {
  89         .init = cdns_ufs_init,
  90         .hce_enable_notify = cdns_ufs_hce_enable_notify,
  91         .link_startup_notify = cdns_ufs_link_startup_notify,
  92 };
  93
  94 static int cdns_ufs_pltfm_probe(struct udevice *dev)
  95 {
  96         int err = ufshcd_probe(dev, &cdns_pltfm_hba_ops);
  97         if (err)
  98                 dev_err(dev, "ufshcd_probe() failed %d\n", err);
  99
 100         return err;
 101 }
 102
 103 static int cdns_ufs_pltfm_bind(struct udevice *dev)
 104 {
 105         struct udevice *scsi_dev;
 106
 107         return ufs_scsi_bind(dev, &scsi_dev);
 108 }
 109
 110 static const struct udevice_id cdns_ufs_pltfm_ids[] = {
 111         {
 112                 .compatible = "cdns,ufshc-m31-16nm",
 113         },
 114         {},
 115 };
 116
 117 U_BOOT_DRIVER(cdns_ufs_pltfm) = {
 118         .name           = "cdns-ufs-pltfm",
 119         .id             =  UCLASS_UFS,
 120         .of_match       = cdns_ufs_pltfm_ids,
 121         .probe          = cdns_ufs_pltfm_probe,
 122         .bind           = cdns_ufs_pltfm_bind,
 123 };