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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2021 MediaTek Inc.
*/
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/soc/mediatek/mtk-cmdq.h>
#include "mtk_disp_drv.h"
#include "mtk_drm_crtc.h"
#include "mtk_drm_ddp_comp.h"
#define DISP_GAMMA_EN 0x0000
#define GAMMA_EN BIT(0)
#define DISP_GAMMA_CFG 0x0020
#define GAMMA_LUT_EN BIT(1)
#define GAMMA_DITHERING BIT(2)
#define DISP_GAMMA_SIZE 0x0030
#define DISP_GAMMA_LUT 0x0700
#define LUT_10BIT_MASK 0x03ff
struct mtk_disp_gamma_data {
bool has_dither;
bool lut_diff;
};
/*
* struct mtk_disp_gamma - DISP_GAMMA driver structure
*/
struct mtk_disp_gamma {
struct clk *clk;
void __iomem *regs;
struct cmdq_client_reg cmdq_reg;
const struct mtk_disp_gamma_data *data;
};
int mtk_gamma_clk_enable(struct device *dev)
{
struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
return clk_prepare_enable(gamma->clk);
}
void mtk_gamma_clk_disable(struct device *dev)
{
struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
clk_disable_unprepare(gamma->clk);
}
void mtk_gamma_set_common(void __iomem *regs, struct drm_crtc_state *state, bool lut_diff)
{
unsigned int i, reg;
struct drm_color_lut *lut;
void __iomem *lut_base;
u32 word;
u32 diff[3] = {0};
if (state->gamma_lut) {
reg = readl(regs + DISP_GAMMA_CFG);
reg = reg | GAMMA_LUT_EN;
writel(reg, regs + DISP_GAMMA_CFG);
lut_base = regs + DISP_GAMMA_LUT;
lut = (struct drm_color_lut *)state->gamma_lut->data;
for (i = 0; i < MTK_LUT_SIZE; i++) {
if (!lut_diff || (i % 2 == 0)) {
word = (((lut[i].red >> 6) & LUT_10BIT_MASK) << 20) +
(((lut[i].green >> 6) & LUT_10BIT_MASK) << 10) +
((lut[i].blue >> 6) & LUT_10BIT_MASK);
} else {
diff[0] = (lut[i].red >> 6) - (lut[i - 1].red >> 6);
diff[1] = (lut[i].green >> 6) - (lut[i - 1].green >> 6);
diff[2] = (lut[i].blue >> 6) - (lut[i - 1].blue >> 6);
word = ((diff[0] & LUT_10BIT_MASK) << 20) +
((diff[1] & LUT_10BIT_MASK) << 10) +
(diff[2] & LUT_10BIT_MASK);
}
writel(word, (lut_base + i * 4));
}
}
}
void mtk_gamma_set(struct device *dev, struct drm_crtc_state *state)
{
struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
bool lut_diff = false;
if (gamma->data)
lut_diff = gamma->data->lut_diff;
mtk_gamma_set_common(gamma->regs, state, lut_diff);
}
void mtk_gamma_config(struct device *dev, unsigned int w,
unsigned int h, unsigned int vrefresh,
unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
{
struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
mtk_ddp_write(cmdq_pkt, h << 16 | w, &gamma->cmdq_reg, gamma->regs,
DISP_GAMMA_SIZE);
if (gamma->data && gamma->data->has_dither)
mtk_dither_set_common(gamma->regs, &gamma->cmdq_reg, bpc,
DISP_GAMMA_CFG, GAMMA_DITHERING, cmdq_pkt);
}
void mtk_gamma_start(struct device *dev)
{
struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
writel(GAMMA_EN, gamma->regs + DISP_GAMMA_EN);
}
void mtk_gamma_stop(struct device *dev)
{
struct mtk_disp_gamma *gamma = dev_get_drvdata(dev);
writel_relaxed(0x0, gamma->regs + DISP_GAMMA_EN);
}
static int mtk_disp_gamma_bind(struct device *dev, struct device *master,
void *data)
{
return 0;
}
static void mtk_disp_gamma_unbind(struct device *dev, struct device *master,
void *data)
{
}
static const struct component_ops mtk_disp_gamma_component_ops = {
.bind = mtk_disp_gamma_bind,
.unbind = mtk_disp_gamma_unbind,
};
static int mtk_disp_gamma_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mtk_disp_gamma *priv;
struct resource *res;
int ret;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->clk = devm_clk_get(dev, NULL);
if (IS_ERR(priv->clk)) {
dev_err(dev, "failed to get gamma clk\n");
return PTR_ERR(priv->clk);
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
priv->regs = devm_ioremap_resource(dev, res);
if (IS_ERR(priv->regs)) {
dev_err(dev, "failed to ioremap gamma\n");
return PTR_ERR(priv->regs);
}
#if IS_REACHABLE(CONFIG_MTK_CMDQ)
ret = cmdq_dev_get_client_reg(dev, &priv->cmdq_reg, 0);
if (ret)
dev_dbg(dev, "get mediatek,gce-client-reg fail!\n");
#endif
priv->data = of_device_get_match_data(dev);
platform_set_drvdata(pdev, priv);
ret = component_add(dev, &mtk_disp_gamma_component_ops);
if (ret)
dev_err(dev, "Failed to add component: %d\n", ret);
return ret;
}
static int mtk_disp_gamma_remove(struct platform_device *pdev)
{
component_del(&pdev->dev, &mtk_disp_gamma_component_ops);
return 0;
}
static const struct mtk_disp_gamma_data mt8173_gamma_driver_data = {
.has_dither = true,
};
static const struct mtk_disp_gamma_data mt8183_gamma_driver_data = {
.lut_diff = true,
};
static const struct of_device_id mtk_disp_gamma_driver_dt_match[] = {
{ .compatible = "mediatek,mt8173-disp-gamma",
.data = &mt8173_gamma_driver_data},
{ .compatible = "mediatek,mt8183-disp-gamma",
.data = &mt8183_gamma_driver_data},
{},
};
MODULE_DEVICE_TABLE(of, mtk_disp_gamma_driver_dt_match);
struct platform_driver mtk_disp_gamma_driver = {
.probe = mtk_disp_gamma_probe,
.remove = mtk_disp_gamma_remove,
.driver = {
.name = "mediatek-disp-gamma",
.owner = THIS_MODULE,
.of_match_table = mtk_disp_gamma_driver_dt_match,
},
};
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