drivers/phy/phy-qcom-ufs-qmp-20nm.c

   1 /*
   2  * Copyright (c) 2013-2015, Linux Foundation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 and
   6  * only version 2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  */
  14
  15 #include "phy-qcom-ufs-qmp-20nm.h"
  16
  17 #define UFS_PHY_NAME "ufs_phy_qmp_20nm"
  18
  19 static
  20 int ufs_qcom_phy_qmp_20nm_phy_calibrate(struct ufs_qcom_phy *ufs_qcom_phy,
  21                                         bool is_rate_B)
  22 {
  23         struct ufs_qcom_phy_calibration *tbl_A, *tbl_B;
  24         int tbl_size_A, tbl_size_B;
  25         u8 major = ufs_qcom_phy->host_ctrl_rev_major;
  26         u16 minor = ufs_qcom_phy->host_ctrl_rev_minor;
  27         u16 step = ufs_qcom_phy->host_ctrl_rev_step;
  28         int err;
  29
  30         if ((major == 0x1) && (minor == 0x002) && (step == 0x0000)) {
  31                 tbl_size_A = ARRAY_SIZE(phy_cal_table_rate_A_1_2_0);
  32                 tbl_A = phy_cal_table_rate_A_1_2_0;
  33         } else if ((major == 0x1) && (minor == 0x003) && (step == 0x0000)) {
  34                 tbl_size_A = ARRAY_SIZE(phy_cal_table_rate_A_1_3_0);
  35                 tbl_A = phy_cal_table_rate_A_1_3_0;
  36         } else {
  37                 dev_err(ufs_qcom_phy->dev, "%s: Unknown UFS-PHY version, no calibration values\n",
  38                         __func__);
  39                 err = -ENODEV;
  40                 goto out;
  41         }
  42
  43         tbl_size_B = ARRAY_SIZE(phy_cal_table_rate_B);
  44         tbl_B = phy_cal_table_rate_B;
  45
  46         err = ufs_qcom_phy_calibrate(ufs_qcom_phy, tbl_A, tbl_size_A,
  47                                                 tbl_B, tbl_size_B, is_rate_B);
  48
  49         if (err)
  50                 dev_err(ufs_qcom_phy->dev, "%s: ufs_qcom_phy_calibrate() failed %d\n",
  51                         __func__, err);
  52
  53 out:
  54         return err;
  55 }
  56
  57 static
  58 void ufs_qcom_phy_qmp_20nm_advertise_quirks(struct ufs_qcom_phy *phy_common)
  59 {
  60         phy_common->quirks =
  61                 UFS_QCOM_PHY_QUIRK_HIBERN8_EXIT_AFTER_PHY_PWR_COLLAPSE;
  62 }
  63
  64 static int ufs_qcom_phy_qmp_20nm_init(struct phy *generic_phy)
  65 {
  66         return 0;
  67 }
  68
  69 static int ufs_qcom_phy_qmp_20nm_exit(struct phy *generic_phy)
  70 {
  71         return 0;
  72 }
  73
  74 static
  75 void ufs_qcom_phy_qmp_20nm_power_control(struct ufs_qcom_phy *phy, bool val)
  76 {
  77         bool hibern8_exit_after_pwr_collapse = phy->quirks &
  78                 UFS_QCOM_PHY_QUIRK_HIBERN8_EXIT_AFTER_PHY_PWR_COLLAPSE;
  79
  80         if (val) {
  81                 writel_relaxed(0x1, phy->mmio + UFS_PHY_POWER_DOWN_CONTROL);
  82                 /*
  83                  * Before any transactions involving PHY, ensure PHY knows
  84                  * that it's analog rail is powered ON.
  85                  */
  86                 mb();
  87
  88                 if (hibern8_exit_after_pwr_collapse) {
  89                         /*
  90                          * Give atleast 1us delay after restoring PHY analog
  91                          * power.
  92                          */
  93                         usleep_range(1, 2);
  94                         writel_relaxed(0x0A, phy->mmio +
  95                                        QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
  96                         writel_relaxed(0x08, phy->mmio +
  97                                        QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
  98                         /*
  99                          * Make sure workaround is deactivated before proceeding
 100                          * with normal PHY operations.
 101                          */
 102                         mb();
 103                 }
 104         } else {
 105                 if (hibern8_exit_after_pwr_collapse) {
 106                         writel_relaxed(0x0A, phy->mmio +
 107                                        QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
 108                         writel_relaxed(0x02, phy->mmio +
 109                                        QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
 110                         /*
 111                          * Make sure that above workaround is activated before
 112                          * PHY analog power collapse.
 113                          */
 114                         mb();
 115                 }
 116
 117                 writel_relaxed(0x0, phy->mmio + UFS_PHY_POWER_DOWN_CONTROL);
 118                 /*
 119                  * ensure that PHY knows its PHY analog rail is going
 120                  * to be powered down
 121                  */
 122                 mb();
 123         }
 124 }
 125
 126 static
 127 void ufs_qcom_phy_qmp_20nm_set_tx_lane_enable(struct ufs_qcom_phy *phy, u32 val)
 128 {
 129         writel_relaxed(val & UFS_PHY_TX_LANE_ENABLE_MASK,
 130                         phy->mmio + UFS_PHY_TX_LANE_ENABLE);
 131         mb();
 132 }
 133
 134 static inline void ufs_qcom_phy_qmp_20nm_start_serdes(struct ufs_qcom_phy *phy)
 135 {
 136         u32 tmp;
 137
 138         tmp = readl_relaxed(phy->mmio + UFS_PHY_PHY_START);
 139         tmp &= ~MASK_SERDES_START;
 140         tmp |= (1 << OFFSET_SERDES_START);
 141         writel_relaxed(tmp, phy->mmio + UFS_PHY_PHY_START);
 142         mb();
 143 }
 144
 145 static int ufs_qcom_phy_qmp_20nm_is_pcs_ready(struct ufs_qcom_phy *phy_common)
 146 {
 147         int err = 0;
 148         u32 val;
 149
 150         err = readl_poll_timeout(phy_common->mmio + UFS_PHY_PCS_READY_STATUS,
 151                         val, (val & MASK_PCS_READY), 10, 1000000);
 152         if (err)
 153                 dev_err(phy_common->dev, "%s: poll for pcs failed err = %d\n",
 154                         __func__, err);
 155         return err;
 156 }
 157
 158 static const struct phy_ops ufs_qcom_phy_qmp_20nm_phy_ops = {
 159         .init           = ufs_qcom_phy_qmp_20nm_init,
 160         .exit           = ufs_qcom_phy_qmp_20nm_exit,
 161         .power_on       = ufs_qcom_phy_power_on,
 162         .power_off      = ufs_qcom_phy_power_off,
 163         .owner          = THIS_MODULE,
 164 };
 165
 166 static struct ufs_qcom_phy_specific_ops phy_20nm_ops = {
 167         .calibrate_phy          = ufs_qcom_phy_qmp_20nm_phy_calibrate,
 168         .start_serdes           = ufs_qcom_phy_qmp_20nm_start_serdes,
 169         .is_physical_coding_sublayer_ready = ufs_qcom_phy_qmp_20nm_is_pcs_ready,
 170         .set_tx_lane_enable     = ufs_qcom_phy_qmp_20nm_set_tx_lane_enable,
 171         .power_control          = ufs_qcom_phy_qmp_20nm_power_control,
 172 };
 173
 174 static int ufs_qcom_phy_qmp_20nm_probe(struct platform_device *pdev)
 175 {
 176         struct device *dev = &pdev->dev;
 177         struct phy *generic_phy;
 178         struct ufs_qcom_phy_qmp_20nm *phy;
 179         struct ufs_qcom_phy *phy_common;
 180         int err = 0;
 181
 182         phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
 183         if (!phy) {
 184                 err = -ENOMEM;
 185                 goto out;
 186         }
 187         phy_common = &phy->common_cfg;
 188
 189         generic_phy = ufs_qcom_phy_generic_probe(pdev, phy_common,
 190                                 &ufs_qcom_phy_qmp_20nm_phy_ops, &phy_20nm_ops);
 191
 192         if (!generic_phy) {
 193                 err = -EIO;
 194                 goto out;
 195         }
 196
 197         err = ufs_qcom_phy_init_clks(phy_common);
 198         if (err)
 199                 goto out;
 200
 201         err = ufs_qcom_phy_init_vregulators(phy_common);
 202         if (err)
 203                 goto out;
 204
 205         ufs_qcom_phy_qmp_20nm_advertise_quirks(phy_common);
 206
 207         phy_set_drvdata(generic_phy, phy);
 208
 209         strlcpy(phy_common->name, UFS_PHY_NAME, sizeof(phy_common->name));
 210
 211 out:
 212         return err;
 213 }
 214
 215 static const struct of_device_id ufs_qcom_phy_qmp_20nm_of_match[] = {
 216         {.compatible = "qcom,ufs-phy-qmp-20nm"},
 217         {},
 218 };
 219 MODULE_DEVICE_TABLE(of, ufs_qcom_phy_qmp_20nm_of_match);
 220
 221 static struct platform_driver ufs_qcom_phy_qmp_20nm_driver = {
 222         .probe = ufs_qcom_phy_qmp_20nm_probe,
 223         .driver = {
 224                 .of_match_table = ufs_qcom_phy_qmp_20nm_of_match,
 225                 .name = "ufs_qcom_phy_qmp_20nm",
 226         },
 227 };
 228
 229 module_platform_driver(ufs_qcom_phy_qmp_20nm_driver);
 230
 231 MODULE_DESCRIPTION("Universal Flash Storage (UFS) QCOM PHY QMP 20nm");
 232 MODULE_LICENSE("GPL v2");