drivers/phy/amlogic/phy-meson-axg-mipi-pcie-analog.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Amlogic AXG MIPI + PCIE analog PHY driver
   4  *
   5  * Copyright (C) 2019 Remi Pommarel <repk@triplefau.lt>
   6  */
   7 #include <linux/bitfield.h>
   8 #include <linux/bitops.h>
   9 #include <linux/module.h>
  10 #include <linux/phy/phy.h>
  11 #include <linux/regmap.h>
  12 #include <linux/delay.h>
  13 #include <linux/mfd/syscon.h>
  14 #include <linux/platform_device.h>
  15 #include <dt-bindings/phy/phy.h>
  16
  17 #define HHI_MIPI_CNTL0 0x00
  18 #define         HHI_MIPI_CNTL0_COMMON_BLOCK     GENMASK(31, 28)
  19 #define         HHI_MIPI_CNTL0_ENABLE           BIT(29)
  20 #define         HHI_MIPI_CNTL0_BANDGAP          BIT(26)
  21 #define         HHI_MIPI_CNTL0_DIF_REF_CTL1     GENMASK(25, 16)
  22 #define         HHI_MIPI_CNTL0_DIF_REF_CTL0     GENMASK(15, 0)
  23
  24 #define HHI_MIPI_CNTL1 0x04
  25 #define         HHI_MIPI_CNTL1_CH0_CML_PDR_EN   BIT(12)
  26 #define         HHI_MIPI_CNTL1_LP_ABILITY       GENMASK(5, 4)
  27 #define         HHI_MIPI_CNTL1_LP_RESISTER      BIT(3)
  28 #define         HHI_MIPI_CNTL1_INPUT_SETTING    BIT(2)
  29 #define         HHI_MIPI_CNTL1_INPUT_SEL        BIT(1)
  30 #define         HHI_MIPI_CNTL1_PRBS7_EN         BIT(0)
  31
  32 #define HHI_MIPI_CNTL2 0x08
  33 #define         HHI_MIPI_CNTL2_CH_PU            GENMASK(31, 25)
  34 #define         HHI_MIPI_CNTL2_CH_CTL           GENMASK(24, 19)
  35 #define         HHI_MIPI_CNTL2_CH0_DIGDR_EN     BIT(18)
  36 #define         HHI_MIPI_CNTL2_CH_DIGDR_EN      BIT(17)
  37 #define         HHI_MIPI_CNTL2_LPULPS_EN        BIT(16)
  38 #define         HHI_MIPI_CNTL2_CH_EN            GENMASK(15, 11)
  39 #define         HHI_MIPI_CNTL2_CH0_LP_CTL       GENMASK(10, 1)
  40
  41 #define DSI_LANE_0              BIT(4)
  42 #define DSI_LANE_1              BIT(3)
  43 #define DSI_LANE_CLK            BIT(2)
  44 #define DSI_LANE_2              BIT(1)
  45 #define DSI_LANE_3              BIT(0)
  46
  47 struct phy_axg_mipi_pcie_analog_priv {
  48         struct phy *phy;
  49         struct regmap *regmap;
  50         bool dsi_configured;
  51         bool dsi_enabled;
  52         bool powered;
  53         struct phy_configure_opts_mipi_dphy config;
  54 };
  55
  56 static void phy_bandgap_enable(struct phy_axg_mipi_pcie_analog_priv *priv)
  57 {
  58         regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0,
  59                         HHI_MIPI_CNTL0_BANDGAP, HHI_MIPI_CNTL0_BANDGAP);
  60
  61         regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0,
  62                         HHI_MIPI_CNTL0_ENABLE, HHI_MIPI_CNTL0_ENABLE);
  63 }
  64
  65 static void phy_bandgap_disable(struct phy_axg_mipi_pcie_analog_priv *priv)
  66 {
  67         regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0,
  68                         HHI_MIPI_CNTL0_BANDGAP, 0);
  69         regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0,
  70                         HHI_MIPI_CNTL0_ENABLE, 0);
  71 }
  72
  73 static void phy_dsi_analog_enable(struct phy_axg_mipi_pcie_analog_priv *priv)
  74 {
  75         u32 reg;
  76
  77         regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0,
  78                            HHI_MIPI_CNTL0_DIF_REF_CTL1,
  79                            FIELD_PREP(HHI_MIPI_CNTL0_DIF_REF_CTL1, 0x1b8));
  80         regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0,
  81                            BIT(31), BIT(31));
  82         regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0,
  83                            HHI_MIPI_CNTL0_DIF_REF_CTL0,
  84                            FIELD_PREP(HHI_MIPI_CNTL0_DIF_REF_CTL0, 0x8));
  85
  86         regmap_write(priv->regmap, HHI_MIPI_CNTL1, 0x001e);
  87
  88         regmap_write(priv->regmap, HHI_MIPI_CNTL2,
  89                      (0x26e0 << 16) | (0x459 << 0));
  90
  91         reg = DSI_LANE_CLK;
  92         switch (priv->config.lanes) {
  93         case 4:
  94                 reg |= DSI_LANE_3;
  95                 fallthrough;
  96         case 3:
  97                 reg |= DSI_LANE_2;
  98                 fallthrough;
  99         case 2:
 100                 reg |= DSI_LANE_1;
 101                 fallthrough;
 102         case 1:
 103                 reg |= DSI_LANE_0;
 104                 break;
 105         default:
 106                 reg = 0;
 107         }
 108
 109         regmap_update_bits(priv->regmap, HHI_MIPI_CNTL2,
 110                            HHI_MIPI_CNTL2_CH_EN,
 111                            FIELD_PREP(HHI_MIPI_CNTL2_CH_EN, reg));
 112
 113         priv->dsi_enabled = true;
 114 }
 115
 116 static void phy_dsi_analog_disable(struct phy_axg_mipi_pcie_analog_priv *priv)
 117 {
 118         regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0,
 119                         HHI_MIPI_CNTL0_DIF_REF_CTL1,
 120                         FIELD_PREP(HHI_MIPI_CNTL0_DIF_REF_CTL1, 0));
 121         regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0, BIT(31), 0);
 122         regmap_update_bits(priv->regmap, HHI_MIPI_CNTL0,
 123                         HHI_MIPI_CNTL0_DIF_REF_CTL1, 0);
 124
 125         regmap_write(priv->regmap, HHI_MIPI_CNTL1, 0x6);
 126
 127         regmap_write(priv->regmap, HHI_MIPI_CNTL2, 0x00200000);
 128
 129         priv->dsi_enabled = false;
 130 }
 131
 132 static int phy_axg_mipi_pcie_analog_configure(struct phy *phy,
 133                                               union phy_configure_opts *opts)
 134 {
 135         struct phy_axg_mipi_pcie_analog_priv *priv = phy_get_drvdata(phy);
 136         int ret;
 137
 138         ret = phy_mipi_dphy_config_validate(&opts->mipi_dphy);
 139         if (ret)
 140                 return ret;
 141
 142         memcpy(&priv->config, opts, sizeof(priv->config));
 143
 144         priv->dsi_configured = true;
 145
 146         /* If PHY was already powered on, setup the DSI analog part */
 147         if (priv->powered) {
 148                 /* If reconfiguring, disable & reconfigure */
 149                 if (priv->dsi_enabled)
 150                         phy_dsi_analog_disable(priv);
 151
 152                 usleep_range(100, 200);
 153
 154                 phy_dsi_analog_enable(priv);
 155         }
 156
 157         return 0;
 158 }
 159
 160 static int phy_axg_mipi_pcie_analog_power_on(struct phy *phy)
 161 {
 162         struct phy_axg_mipi_pcie_analog_priv *priv = phy_get_drvdata(phy);
 163
 164         phy_bandgap_enable(priv);
 165
 166         if (priv->dsi_configured)
 167                 phy_dsi_analog_enable(priv);
 168
 169         priv->powered = true;
 170
 171         return 0;
 172 }
 173
 174 static int phy_axg_mipi_pcie_analog_power_off(struct phy *phy)
 175 {
 176         struct phy_axg_mipi_pcie_analog_priv *priv = phy_get_drvdata(phy);
 177
 178         phy_bandgap_disable(priv);
 179
 180         if (priv->dsi_enabled)
 181                 phy_dsi_analog_disable(priv);
 182
 183         priv->powered = false;
 184
 185         return 0;
 186 }
 187
 188 static const struct phy_ops phy_axg_mipi_pcie_analog_ops = {
 189         .configure = phy_axg_mipi_pcie_analog_configure,
 190         .power_on = phy_axg_mipi_pcie_analog_power_on,
 191         .power_off = phy_axg_mipi_pcie_analog_power_off,
 192         .owner = THIS_MODULE,
 193 };
 194
 195 static int phy_axg_mipi_pcie_analog_probe(struct platform_device *pdev)
 196 {
 197         struct phy_provider *phy;
 198         struct device *dev = &pdev->dev;
 199         struct phy_axg_mipi_pcie_analog_priv *priv;
 200         struct device_node *np = dev->of_node;
 201         struct regmap *map;
 202         int ret;
 203
 204         priv = devm_kmalloc(dev, sizeof(*priv), GFP_KERNEL);
 205         if (!priv)
 206                 return -ENOMEM;
 207
 208         /* Get the hhi system controller node */
 209         map = syscon_node_to_regmap(of_get_parent(dev->of_node));
 210         if (IS_ERR(map)) {
 211                 dev_err(dev,
 212                         "failed to get HHI regmap\n");
 213                 return PTR_ERR(map);
 214         }
 215
 216         priv->regmap = map;
 217
 218         priv->phy = devm_phy_create(dev, np, &phy_axg_mipi_pcie_analog_ops);
 219         if (IS_ERR(priv->phy)) {
 220                 ret = PTR_ERR(priv->phy);
 221                 if (ret != -EPROBE_DEFER)
 222                         dev_err(dev, "failed to create PHY\n");
 223                 return ret;
 224         }
 225
 226         phy_set_drvdata(priv->phy, priv);
 227         dev_set_drvdata(dev, priv);
 228
 229         phy = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 230
 231         return PTR_ERR_OR_ZERO(phy);
 232 }
 233
 234 static const struct of_device_id phy_axg_mipi_pcie_analog_of_match[] = {
 235         {
 236                 .compatible = "amlogic,axg-mipi-pcie-analog-phy",
 237         },
 238         { },
 239 };
 240 MODULE_DEVICE_TABLE(of, phy_axg_mipi_pcie_analog_of_match);
 241
 242 static struct platform_driver phy_axg_mipi_pcie_analog_driver = {
 243         .probe = phy_axg_mipi_pcie_analog_probe,
 244         .driver = {
 245                 .name = "phy-axg-mipi-pcie-analog",
 246                 .of_match_table = phy_axg_mipi_pcie_analog_of_match,
 247         },
 248 };
 249 module_platform_driver(phy_axg_mipi_pcie_analog_driver);
 250
 251 MODULE_AUTHOR("Remi Pommarel <repk@triplefau.lt>");
 252 MODULE_DESCRIPTION("Amlogic AXG MIPI + PCIE analog PHY driver");
 253 MODULE_LICENSE("GPL v2");