drivers/phy/qualcomm/phy-qcom-ufs-qmp-14nm.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2013-2015, Linux Foundation. All rights reserved.
   4  */
   5
   6 #include "phy-qcom-ufs-qmp-14nm.h"
   7
   8 #define UFS_PHY_NAME "ufs_phy_qmp_14nm"
   9 #define UFS_PHY_VDDA_PHY_UV     (925000)
  10
  11 static
  12 int ufs_qcom_phy_qmp_14nm_phy_calibrate(struct ufs_qcom_phy *ufs_qcom_phy,
  13                                         bool is_rate_B)
  14 {
  15         int tbl_size_A = ARRAY_SIZE(phy_cal_table_rate_A);
  16         int tbl_size_B = ARRAY_SIZE(phy_cal_table_rate_B);
  17         int err;
  18
  19         err = ufs_qcom_phy_calibrate(ufs_qcom_phy, phy_cal_table_rate_A,
  20                 tbl_size_A, phy_cal_table_rate_B, tbl_size_B, is_rate_B);
  21
  22         if (err)
  23                 dev_err(ufs_qcom_phy->dev,
  24                         "%s: ufs_qcom_phy_calibrate() failed %d\n",
  25                         __func__, err);
  26         return err;
  27 }
  28
  29 static
  30 void ufs_qcom_phy_qmp_14nm_advertise_quirks(struct ufs_qcom_phy *phy_common)
  31 {
  32         phy_common->quirks =
  33                 UFS_QCOM_PHY_QUIRK_HIBERN8_EXIT_AFTER_PHY_PWR_COLLAPSE;
  34 }
  35
  36 static
  37 int ufs_qcom_phy_qmp_14nm_set_mode(struct phy *generic_phy,
  38                                    enum phy_mode mode, int submode)
  39 {
  40         struct ufs_qcom_phy *phy_common = get_ufs_qcom_phy(generic_phy);
  41
  42         phy_common->mode = PHY_MODE_INVALID;
  43
  44         if (mode > 0)
  45                 phy_common->mode = mode;
  46
  47         return 0;
  48 }
  49
  50 static
  51 void ufs_qcom_phy_qmp_14nm_power_control(struct ufs_qcom_phy *phy, bool val)
  52 {
  53         writel_relaxed(val ? 0x1 : 0x0, phy->mmio + UFS_PHY_POWER_DOWN_CONTROL);
  54         /*
  55          * Before any transactions involving PHY, ensure PHY knows
  56          * that it's analog rail is powered ON (or OFF).
  57          */
  58         mb();
  59 }
  60
  61 static inline
  62 void ufs_qcom_phy_qmp_14nm_set_tx_lane_enable(struct ufs_qcom_phy *phy, u32 val)
  63 {
  64         /*
  65          * 14nm PHY does not have TX_LANE_ENABLE register.
  66          * Implement this function so as not to propagate error to caller.
  67          */
  68 }
  69
  70 static inline void ufs_qcom_phy_qmp_14nm_start_serdes(struct ufs_qcom_phy *phy)
  71 {
  72         u32 tmp;
  73
  74         tmp = readl_relaxed(phy->mmio + UFS_PHY_PHY_START);
  75         tmp &= ~MASK_SERDES_START;
  76         tmp |= (1 << OFFSET_SERDES_START);
  77         writel_relaxed(tmp, phy->mmio + UFS_PHY_PHY_START);
  78         /* Ensure register value is committed */
  79         mb();
  80 }
  81
  82 static int ufs_qcom_phy_qmp_14nm_is_pcs_ready(struct ufs_qcom_phy *phy_common)
  83 {
  84         int err = 0;
  85         u32 val;
  86
  87         err = readl_poll_timeout(phy_common->mmio + UFS_PHY_PCS_READY_STATUS,
  88                 val, (val & MASK_PCS_READY), 10, 1000000);
  89         if (err)
  90                 dev_err(phy_common->dev, "%s: poll for pcs failed err = %d\n",
  91                         __func__, err);
  92         return err;
  93 }
  94
  95 static const struct phy_ops ufs_qcom_phy_qmp_14nm_phy_ops = {
  96         .power_on       = ufs_qcom_phy_power_on,
  97         .power_off      = ufs_qcom_phy_power_off,
  98         .set_mode       = ufs_qcom_phy_qmp_14nm_set_mode,
  99         .owner          = THIS_MODULE,
 100 };
 101
 102 static struct ufs_qcom_phy_specific_ops phy_14nm_ops = {
 103         .calibrate              = ufs_qcom_phy_qmp_14nm_phy_calibrate,
 104         .start_serdes           = ufs_qcom_phy_qmp_14nm_start_serdes,
 105         .is_physical_coding_sublayer_ready = ufs_qcom_phy_qmp_14nm_is_pcs_ready,
 106         .set_tx_lane_enable     = ufs_qcom_phy_qmp_14nm_set_tx_lane_enable,
 107         .power_control          = ufs_qcom_phy_qmp_14nm_power_control,
 108 };
 109
 110 static int ufs_qcom_phy_qmp_14nm_probe(struct platform_device *pdev)
 111 {
 112         struct device *dev = &pdev->dev;
 113         struct phy *generic_phy;
 114         struct ufs_qcom_phy_qmp_14nm *phy;
 115         struct ufs_qcom_phy *phy_common;
 116         int err = 0;
 117
 118         phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
 119         if (!phy) {
 120                 err = -ENOMEM;
 121                 goto out;
 122         }
 123         phy_common = &phy->common_cfg;
 124
 125         generic_phy = ufs_qcom_phy_generic_probe(pdev, phy_common,
 126                                 &ufs_qcom_phy_qmp_14nm_phy_ops, &phy_14nm_ops);
 127
 128         if (!generic_phy) {
 129                 err = -EIO;
 130                 goto out;
 131         }
 132
 133         err = ufs_qcom_phy_init_clks(phy_common);
 134         if (err)
 135                 goto out;
 136
 137         err = ufs_qcom_phy_init_vregulators(phy_common);
 138         if (err)
 139                 goto out;
 140
 141         phy_common->vdda_phy.max_uV = UFS_PHY_VDDA_PHY_UV;
 142         phy_common->vdda_phy.min_uV = UFS_PHY_VDDA_PHY_UV;
 143
 144         ufs_qcom_phy_qmp_14nm_advertise_quirks(phy_common);
 145
 146         phy_set_drvdata(generic_phy, phy);
 147
 148         strlcpy(phy_common->name, UFS_PHY_NAME, sizeof(phy_common->name));
 149
 150 out:
 151         return err;
 152 }
 153
 154 static const struct of_device_id ufs_qcom_phy_qmp_14nm_of_match[] = {
 155         {.compatible = "qcom,ufs-phy-qmp-14nm"},
 156         {.compatible = "qcom,msm8996-ufs-phy-qmp-14nm"},
 157         {},
 158 };
 159 MODULE_DEVICE_TABLE(of, ufs_qcom_phy_qmp_14nm_of_match);
 160
 161 static struct platform_driver ufs_qcom_phy_qmp_14nm_driver = {
 162         .probe = ufs_qcom_phy_qmp_14nm_probe,
 163         .driver = {
 164                 .of_match_table = ufs_qcom_phy_qmp_14nm_of_match,
 165                 .name = "ufs_qcom_phy_qmp_14nm",
 166         },
 167 };
 168
 169 module_platform_driver(ufs_qcom_phy_qmp_14nm_driver);
 170
 171 MODULE_DESCRIPTION("Universal Flash Storage (UFS) QCOM PHY QMP 14nm");
 172 MODULE_LICENSE("GPL v2");