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 - https://www.ti.com
   6  */
   7
   8 #include <clk.h>
   9 #include <dm.h>
  10 #include <ufs.h>
  11 #include <asm/io.h>
  12 #include <dm/device_compat.h>
  13 #include <linux/bitops.h>
  14 #include <linux/err.h>
  15 #include <linux/time.h>
  16
  17 #include "ufs.h"
  18
  19 #define CDNS_UFS_REG_HCLKDIV    0xFC
  20 #define CDNS_UFS_REG_PHY_XCFGD1 0x113C
  21
  22 static int cdns_ufs_link_startup_notify(struct ufs_hba *hba,
  23                                         enum ufs_notify_change_status status)
  24 {
  25         hba->quirks |= UFSHCD_QUIRK_BROKEN_LCC;
  26         switch (status) {
  27         case PRE_CHANGE:
  28                 return ufshcd_dme_set(hba,
  29                                       UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE),
  30                                       0);
  31         case POST_CHANGE:
  32         ;
  33         }
  34
  35         return 0;
  36 }
  37
  38 static int cdns_ufs_set_hclkdiv(struct ufs_hba *hba)
  39 {
  40         struct clk clk;
  41         unsigned long core_clk_rate = 0;
  42         u32 core_clk_div = 0;
  43         int ret;
  44
  45         ret = clk_get_by_name(hba->dev, "core_clk", &clk);
  46         if (ret) {
  47                 dev_err(hba->dev, "failed to get core_clk clock\n");
  48                 return ret;
  49         }
  50
  51         core_clk_rate = clk_get_rate(&clk);
  52         if (IS_ERR_VALUE(core_clk_rate)) {
  53                 dev_err(hba->dev, "%s: unable to find core_clk rate\n",
  54                         __func__);
  55                 return core_clk_rate;
  56         }
  57
  58         core_clk_div = core_clk_rate / USEC_PER_SEC;
  59         ufshcd_writel(hba, core_clk_div, CDNS_UFS_REG_HCLKDIV);
  60
  61         return 0;
  62 }
  63
  64 static int cdns_ufs_hce_enable_notify(struct ufs_hba *hba,
  65                                       enum ufs_notify_change_status status)
  66 {
  67         switch (status) {
  68         case PRE_CHANGE:
  69                 return cdns_ufs_set_hclkdiv(hba);
  70         case POST_CHANGE:
  71         ;
  72         }
  73
  74         return 0;
  75 }
  76
  77 static int cdns_ufs_init(struct ufs_hba *hba)
  78 {
  79         u32 data;
  80
  81         /* Increase RX_Advanced_Min_ActivateTime_Capability */
  82         data = ufshcd_readl(hba, CDNS_UFS_REG_PHY_XCFGD1);
  83         data |= BIT(24);
  84         ufshcd_writel(hba, data, CDNS_UFS_REG_PHY_XCFGD1);
  85
  86         return 0;
  87 }
  88
  89 static struct ufs_hba_ops cdns_pltfm_hba_ops = {
  90         .init = cdns_ufs_init,
  91         .hce_enable_notify = cdns_ufs_hce_enable_notify,
  92         .link_startup_notify = cdns_ufs_link_startup_notify,
  93 };
  94
  95 static int cdns_ufs_pltfm_probe(struct udevice *dev)
  96 {
  97         int err = ufshcd_probe(dev, &cdns_pltfm_hba_ops);
  98         if (err)
  99                 dev_err(dev, "ufshcd_probe() failed %d\n", err);
 100
 101         return err;
 102 }
 103
 104 static int cdns_ufs_pltfm_bind(struct udevice *dev)
 105 {
 106         struct udevice *scsi_dev;
 107
 108         return ufs_scsi_bind(dev, &scsi_dev);
 109 }
 110
 111 static const struct udevice_id cdns_ufs_pltfm_ids[] = {
 112         {
 113                 .compatible = "cdns,ufshc-m31-16nm",
 114         },
 115         {},
 116 };
 117
 118 U_BOOT_DRIVER(cdns_ufs_pltfm) = {
 119         .name           = "cdns-ufs-pltfm",
 120         .id             = UCLASS_UFS,
 121         .of_match       = cdns_ufs_pltfm_ids,
 122         .probe          = cdns_ufs_pltfm_probe,
 123         .bind           = cdns_ufs_pltfm_bind,
 124 };