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 <asm/io.h>
  13 #include <dm/device_compat.h>
  14 #include <linux/bitops.h>
  15 #include <linux/err.h>
  16
  17 #include "ufs.h"
  18
  19 #define USEC_PER_SEC    1000000L
  20
  21 #define CDNS_UFS_REG_HCLKDIV    0xFC
  22 #define CDNS_UFS_REG_PHY_XCFGD1 0x113C
  23
  24 static int cdns_ufs_link_startup_notify(struct ufs_hba *hba,
  25                                         enum ufs_notify_change_status status)
  26 {
  27         hba->quirks |= UFSHCD_QUIRK_BROKEN_LCC;
  28         switch (status) {
  29         case PRE_CHANGE:
  30                 return ufshcd_dme_set(hba,
  31                                       UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE),
  32                                       0);
  33         case POST_CHANGE:
  34         ;
  35         }
  36
  37         return 0;
  38 }
  39
  40 static int cdns_ufs_set_hclkdiv(struct ufs_hba *hba)
  41 {
  42         struct clk clk;
  43         unsigned long core_clk_rate = 0;
  44         u32 core_clk_div = 0;
  45         int ret;
  46
  47         ret = clk_get_by_name(hba->dev, "core_clk", &clk);
  48         if (ret) {
  49                 dev_err(hba->dev, "failed to get core_clk clock\n");
  50                 return ret;
  51         }
  52
  53         core_clk_rate = clk_get_rate(&clk);
  54         if (IS_ERR_VALUE(core_clk_rate)) {
  55                 dev_err(hba->dev, "%s: unable to find core_clk rate\n",
  56                         __func__);
  57                 return core_clk_rate;
  58         }
  59
  60         core_clk_div = core_clk_rate / USEC_PER_SEC;
  61         ufshcd_writel(hba, core_clk_div, CDNS_UFS_REG_HCLKDIV);
  62
  63         return 0;
  64 }
  65
  66 static int cdns_ufs_hce_enable_notify(struct ufs_hba *hba,
  67                                       enum ufs_notify_change_status status)
  68 {
  69         switch (status) {
  70         case PRE_CHANGE:
  71                 return cdns_ufs_set_hclkdiv(hba);
  72         case POST_CHANGE:
  73         ;
  74         }
  75
  76         return 0;
  77 }
  78
  79 static int cdns_ufs_init(struct ufs_hba *hba)
  80 {
  81         u32 data;
  82
  83         /* Increase RX_Advanced_Min_ActivateTime_Capability */
  84         data = ufshcd_readl(hba, CDNS_UFS_REG_PHY_XCFGD1);
  85         data |= BIT(24);
  86         ufshcd_writel(hba, data, CDNS_UFS_REG_PHY_XCFGD1);
  87
  88         return 0;
  89 }
  90
  91 static struct ufs_hba_ops cdns_pltfm_hba_ops = {
  92         .init = cdns_ufs_init,
  93         .hce_enable_notify = cdns_ufs_hce_enable_notify,
  94         .link_startup_notify = cdns_ufs_link_startup_notify,
  95 };
  96
  97 static int cdns_ufs_pltfm_probe(struct udevice *dev)
  98 {
  99         int err = ufshcd_probe(dev, &cdns_pltfm_hba_ops);
 100         if (err)
 101                 dev_err(dev, "ufshcd_probe() failed %d\n", err);
 102
 103         return err;
 104 }
 105
 106 static int cdns_ufs_pltfm_bind(struct udevice *dev)
 107 {
 108         struct udevice *scsi_dev;
 109
 110         return ufs_scsi_bind(dev, &scsi_dev);
 111 }
 112
 113 static const struct udevice_id cdns_ufs_pltfm_ids[] = {
 114         {
 115                 .compatible = "cdns,ufshc-m31-16nm",
 116         },
 117         {},
 118 };
 119
 120 U_BOOT_DRIVER(cdns_ufs_pltfm) = {
 121         .name           = "cdns-ufs-pltfm",
 122         .id             =  UCLASS_UFS,
 123         .of_match       = cdns_ufs_pltfm_ids,
 124         .probe          = cdns_ufs_pltfm_probe,
 125         .bind           = cdns_ufs_pltfm_bind,
 126 };