drivers/gpu/drm/mediatek/mtk_hdmi_phy.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2018 MediaTek Inc.
   4  * Author: Jie Qiu <jie.qiu@mediatek.com>
   5  */
   6
   7 #include "mtk_hdmi_phy.h"
   8
   9 static int mtk_hdmi_phy_power_on(struct phy *phy);
  10 static int mtk_hdmi_phy_power_off(struct phy *phy);
  11
  12 static const struct phy_ops mtk_hdmi_phy_dev_ops = {
  13         .power_on = mtk_hdmi_phy_power_on,
  14         .power_off = mtk_hdmi_phy_power_off,
  15         .owner = THIS_MODULE,
  16 };
  17
  18 void mtk_hdmi_phy_clear_bits(struct mtk_hdmi_phy *hdmi_phy, u32 offset,
  19                              u32 bits)
  20 {
  21         void __iomem *reg = hdmi_phy->regs + offset;
  22         u32 tmp;
  23
  24         tmp = readl(reg);
  25         tmp &= ~bits;
  26         writel(tmp, reg);
  27 }
  28
  29 void mtk_hdmi_phy_set_bits(struct mtk_hdmi_phy *hdmi_phy, u32 offset,
  30                            u32 bits)
  31 {
  32         void __iomem *reg = hdmi_phy->regs + offset;
  33         u32 tmp;
  34
  35         tmp = readl(reg);
  36         tmp |= bits;
  37         writel(tmp, reg);
  38 }
  39
  40 void mtk_hdmi_phy_mask(struct mtk_hdmi_phy *hdmi_phy, u32 offset,
  41                        u32 val, u32 mask)
  42 {
  43         void __iomem *reg = hdmi_phy->regs + offset;
  44         u32 tmp;
  45
  46         tmp = readl(reg);
  47         tmp = (tmp & ~mask) | (val & mask);
  48         writel(tmp, reg);
  49 }
  50
  51 inline struct mtk_hdmi_phy *to_mtk_hdmi_phy(struct clk_hw *hw)
  52 {
  53         return container_of(hw, struct mtk_hdmi_phy, pll_hw);
  54 }
  55
  56 static int mtk_hdmi_phy_power_on(struct phy *phy)
  57 {
  58         struct mtk_hdmi_phy *hdmi_phy = phy_get_drvdata(phy);
  59         int ret;
  60
  61         ret = clk_prepare_enable(hdmi_phy->pll);
  62         if (ret < 0)
  63                 return ret;
  64
  65         hdmi_phy->conf->hdmi_phy_enable_tmds(hdmi_phy);
  66         return 0;
  67 }
  68
  69 static int mtk_hdmi_phy_power_off(struct phy *phy)
  70 {
  71         struct mtk_hdmi_phy *hdmi_phy = phy_get_drvdata(phy);
  72
  73         hdmi_phy->conf->hdmi_phy_disable_tmds(hdmi_phy);
  74         clk_disable_unprepare(hdmi_phy->pll);
  75
  76         return 0;
  77 }
  78
  79 static const struct phy_ops *
  80 mtk_hdmi_phy_dev_get_ops(const struct mtk_hdmi_phy *hdmi_phy)
  81 {
  82         if (hdmi_phy && hdmi_phy->conf &&
  83             hdmi_phy->conf->hdmi_phy_enable_tmds &&
  84             hdmi_phy->conf->hdmi_phy_disable_tmds)
  85                 return &mtk_hdmi_phy_dev_ops;
  86
  87         dev_err(hdmi_phy->dev, "Failed to get dev ops of phy\n");
  88                 return NULL;
  89 }
  90
  91 static void mtk_hdmi_phy_clk_get_data(struct mtk_hdmi_phy *hdmi_phy,
  92                                       struct clk_init_data *clk_init)
  93 {
  94         clk_init->flags = hdmi_phy->conf->flags;
  95         clk_init->ops = hdmi_phy->conf->hdmi_phy_clk_ops;
  96 }
  97
  98 static int mtk_hdmi_phy_probe(struct platform_device *pdev)
  99 {
 100         struct device *dev = &pdev->dev;
 101         struct mtk_hdmi_phy *hdmi_phy;
 102         struct resource *mem;
 103         struct clk *ref_clk;
 104         const char *ref_clk_name;
 105         struct clk_init_data clk_init = {
 106                 .num_parents = 1,
 107                 .parent_names = (const char * const *)&ref_clk_name,
 108         };
 109
 110         struct phy *phy;
 111         struct phy_provider *phy_provider;
 112         int ret;
 113
 114         hdmi_phy = devm_kzalloc(dev, sizeof(*hdmi_phy), GFP_KERNEL);
 115         if (!hdmi_phy)
 116                 return -ENOMEM;
 117
 118         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 119         hdmi_phy->regs = devm_ioremap_resource(dev, mem);
 120         if (IS_ERR(hdmi_phy->regs)) {
 121                 ret = PTR_ERR(hdmi_phy->regs);
 122                 dev_err(dev, "Failed to get memory resource: %d\n", ret);
 123                 return ret;
 124         }
 125
 126         ref_clk = devm_clk_get(dev, "pll_ref");
 127         if (IS_ERR(ref_clk)) {
 128                 ret = PTR_ERR(ref_clk);
 129                 dev_err(&pdev->dev, "Failed to get PLL reference clock: %d\n",
 130                         ret);
 131                 return ret;
 132         }
 133         ref_clk_name = __clk_get_name(ref_clk);
 134
 135         ret = of_property_read_string(dev->of_node, "clock-output-names",
 136                                       &clk_init.name);
 137         if (ret < 0) {
 138                 dev_err(dev, "Failed to read clock-output-names: %d\n", ret);
 139                 return ret;
 140         }
 141
 142         hdmi_phy->dev = dev;
 143         hdmi_phy->conf =
 144                 (struct mtk_hdmi_phy_conf *)of_device_get_match_data(dev);
 145         mtk_hdmi_phy_clk_get_data(hdmi_phy, &clk_init);
 146         hdmi_phy->pll_hw.init = &clk_init;
 147         hdmi_phy->pll = devm_clk_register(dev, &hdmi_phy->pll_hw);
 148         if (IS_ERR(hdmi_phy->pll)) {
 149                 ret = PTR_ERR(hdmi_phy->pll);
 150                 dev_err(dev, "Failed to register PLL: %d\n", ret);
 151                 return ret;
 152         }
 153
 154         ret = of_property_read_u32(dev->of_node, "mediatek,ibias",
 155                                    &hdmi_phy->ibias);
 156         if (ret < 0) {
 157                 dev_err(&pdev->dev, "Failed to get ibias: %d\n", ret);
 158                 return ret;
 159         }
 160
 161         ret = of_property_read_u32(dev->of_node, "mediatek,ibias_up",
 162                                    &hdmi_phy->ibias_up);
 163         if (ret < 0) {
 164                 dev_err(&pdev->dev, "Failed to get ibias up: %d\n", ret);
 165                 return ret;
 166         }
 167
 168         dev_info(dev, "Using default TX DRV impedance: 4.2k/36\n");
 169         hdmi_phy->drv_imp_clk = 0x30;
 170         hdmi_phy->drv_imp_d2 = 0x30;
 171         hdmi_phy->drv_imp_d1 = 0x30;
 172         hdmi_phy->drv_imp_d0 = 0x30;
 173
 174         phy = devm_phy_create(dev, NULL, mtk_hdmi_phy_dev_get_ops(hdmi_phy));
 175         if (IS_ERR(phy)) {
 176                 dev_err(dev, "Failed to create HDMI PHY\n");
 177                 return PTR_ERR(phy);
 178         }
 179         phy_set_drvdata(phy, hdmi_phy);
 180
 181         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 182         if (IS_ERR(phy_provider)) {
 183                 dev_err(dev, "Failed to register HDMI PHY\n");
 184                 return PTR_ERR(phy_provider);
 185         }
 186
 187         return of_clk_add_provider(dev->of_node, of_clk_src_simple_get,
 188                                    hdmi_phy->pll);
 189 }
 190
 191 static const struct of_device_id mtk_hdmi_phy_match[] = {
 192         { .compatible = "mediatek,mt2701-hdmi-phy",
 193           .data = &mtk_hdmi_phy_2701_conf,
 194         },
 195         { .compatible = "mediatek,mt8173-hdmi-phy",
 196           .data = &mtk_hdmi_phy_8173_conf,
 197         },
 198         {},
 199 };
 200
 201 struct platform_driver mtk_hdmi_phy_driver = {
 202         .probe = mtk_hdmi_phy_probe,
 203         .driver = {
 204                 .name = "mediatek-hdmi-phy",
 205                 .of_match_table = mtk_hdmi_phy_match,
 206         },
 207 };
 208
 209 MODULE_DESCRIPTION("MediaTek HDMI PHY Driver");
 210 MODULE_LICENSE("GPL v2");