1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2021 MediaTek Inc. 4 */ 5 6 #include <linux/clk.h> 7 #include <linux/component.h> 8 #include <linux/module.h> 9 #include <linux/of_device.h> 10 #include <linux/of_irq.h> 11 #include <linux/platform_device.h> 12 #include <linux/soc/mediatek/mtk-cmdq.h> 13 14 #include "mtk_disp_drv.h" 15 #include "mtk_drm_crtc.h" 16 #include "mtk_drm_ddp_comp.h" 17 18 #define DISP_GAMMA_EN 0x0000 19 #define GAMMA_EN BIT(0) 20 #define DISP_GAMMA_CFG 0x0020 21 #define GAMMA_LUT_EN BIT(1) 22 #define GAMMA_DITHERING BIT(2) 23 #define DISP_GAMMA_SIZE 0x0030 24 #define DISP_GAMMA_LUT 0x0700 25 26 #define LUT_10BIT_MASK 0x03ff 27 28 struct mtk_disp_gamma_data { 29 bool has_dither; 30 }; 31 32 /** 33 * struct mtk_disp_gamma - DISP_GAMMA driver structure 34 * @ddp_comp - structure containing type enum and hardware resources 35 * @crtc - associated crtc to report irq events to 36 */ 37 struct mtk_disp_gamma { 38 struct clk *clk; 39 void __iomem *regs; 40 struct cmdq_client_reg cmdq_reg; 41 const struct mtk_disp_gamma_data *data; 42 }; 43 44 int mtk_gamma_clk_enable(struct device *dev) 45 { 46 struct mtk_disp_gamma *gamma = dev_get_drvdata(dev); 47 48 return clk_prepare_enable(gamma->clk); 49 } 50 51 void mtk_gamma_clk_disable(struct device *dev) 52 { 53 struct mtk_disp_gamma *gamma = dev_get_drvdata(dev); 54 55 clk_disable_unprepare(gamma->clk); 56 } 57 58 void mtk_gamma_set_common(void __iomem *regs, struct drm_crtc_state *state) 59 { 60 unsigned int i, reg; 61 struct drm_color_lut *lut; 62 void __iomem *lut_base; 63 u32 word; 64 65 if (state->gamma_lut) { 66 reg = readl(regs + DISP_GAMMA_CFG); 67 reg = reg | GAMMA_LUT_EN; 68 writel(reg, regs + DISP_GAMMA_CFG); 69 lut_base = regs + DISP_GAMMA_LUT; 70 lut = (struct drm_color_lut *)state->gamma_lut->data; 71 for (i = 0; i < MTK_LUT_SIZE; i++) { 72 word = (((lut[i].red >> 6) & LUT_10BIT_MASK) << 20) + 73 (((lut[i].green >> 6) & LUT_10BIT_MASK) << 10) + 74 ((lut[i].blue >> 6) & LUT_10BIT_MASK); 75 writel(word, (lut_base + i * 4)); 76 } 77 } 78 } 79 80 void mtk_gamma_set(struct device *dev, struct drm_crtc_state *state) 81 { 82 struct mtk_disp_gamma *gamma = dev_get_drvdata(dev); 83 84 mtk_gamma_set_common(gamma->regs, state); 85 } 86 87 void mtk_gamma_config(struct device *dev, unsigned int w, 88 unsigned int h, unsigned int vrefresh, 89 unsigned int bpc, struct cmdq_pkt *cmdq_pkt) 90 { 91 struct mtk_disp_gamma *gamma = dev_get_drvdata(dev); 92 93 mtk_ddp_write(cmdq_pkt, h << 16 | w, &gamma->cmdq_reg, gamma->regs, 94 DISP_GAMMA_SIZE); 95 if (gamma->data && gamma->data->has_dither) 96 mtk_dither_set_common(gamma->regs, &gamma->cmdq_reg, bpc, 97 DISP_GAMMA_CFG, GAMMA_DITHERING, cmdq_pkt); 98 } 99 100 void mtk_gamma_start(struct device *dev) 101 { 102 struct mtk_disp_gamma *gamma = dev_get_drvdata(dev); 103 104 writel(GAMMA_EN, gamma->regs + DISP_GAMMA_EN); 105 } 106 107 void mtk_gamma_stop(struct device *dev) 108 { 109 struct mtk_disp_gamma *gamma = dev_get_drvdata(dev); 110 111 writel_relaxed(0x0, gamma->regs + DISP_GAMMA_EN); 112 } 113 114 static int mtk_disp_gamma_bind(struct device *dev, struct device *master, 115 void *data) 116 { 117 return 0; 118 } 119 120 static void mtk_disp_gamma_unbind(struct device *dev, struct device *master, 121 void *data) 122 { 123 } 124 125 static const struct component_ops mtk_disp_gamma_component_ops = { 126 .bind = mtk_disp_gamma_bind, 127 .unbind = mtk_disp_gamma_unbind, 128 }; 129 130 static int mtk_disp_gamma_probe(struct platform_device *pdev) 131 { 132 struct device *dev = &pdev->dev; 133 struct mtk_disp_gamma *priv; 134 struct resource *res; 135 int ret; 136 137 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 138 if (!priv) 139 return -ENOMEM; 140 141 priv->clk = devm_clk_get(dev, NULL); 142 if (IS_ERR(priv->clk)) { 143 dev_err(dev, "failed to get gamma clk\n"); 144 return PTR_ERR(priv->clk); 145 } 146 147 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 148 priv->regs = devm_ioremap_resource(dev, res); 149 if (IS_ERR(priv->regs)) { 150 dev_err(dev, "failed to ioremap gamma\n"); 151 return PTR_ERR(priv->regs); 152 } 153 154 #if IS_REACHABLE(CONFIG_MTK_CMDQ) 155 ret = cmdq_dev_get_client_reg(dev, &priv->cmdq_reg, 0); 156 if (ret) 157 dev_dbg(dev, "get mediatek,gce-client-reg fail!\n"); 158 #endif 159 160 priv->data = of_device_get_match_data(dev); 161 platform_set_drvdata(pdev, priv); 162 163 ret = component_add(dev, &mtk_disp_gamma_component_ops); 164 if (ret) 165 dev_err(dev, "Failed to add component: %d\n", ret); 166 167 return ret; 168 } 169 170 static int mtk_disp_gamma_remove(struct platform_device *pdev) 171 { 172 component_del(&pdev->dev, &mtk_disp_gamma_component_ops); 173 174 return 0; 175 } 176 177 static const struct mtk_disp_gamma_data mt8173_gamma_driver_data = { 178 .has_dither = true, 179 }; 180 181 static const struct of_device_id mtk_disp_gamma_driver_dt_match[] = { 182 { .compatible = "mediatek,mt8173-disp-gamma", 183 .data = &mt8173_gamma_driver_data}, 184 { .compatible = "mediatek,mt8183-disp-gamma"}, 185 {}, 186 }; 187 MODULE_DEVICE_TABLE(of, mtk_disp_gamma_driver_dt_match); 188 189 struct platform_driver mtk_disp_gamma_driver = { 190 .probe = mtk_disp_gamma_probe, 191 .remove = mtk_disp_gamma_remove, 192 .driver = { 193 .name = "mediatek-disp-gamma", 194 .owner = THIS_MODULE, 195 .of_match_table = mtk_disp_gamma_driver_dt_match, 196 }, 197 }; 198