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