1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2021 MediaTek Inc.
4 */
5
6#include <linux/bitfield.h>
7#include <linux/clk.h>
8#include <linux/component.h>
9#include <linux/module.h>
10#include <linux/of.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#include "mtk_drm_drv.h"
18
19#define DISP_AAL_EN				0x0000
20#define AAL_EN						BIT(0)
21#define DISP_AAL_CFG				0x0020
22#define AAL_RELAY_MODE					BIT(0)
23#define AAL_GAMMA_LUT_EN				BIT(1)
24#define DISP_AAL_SIZE				0x0030
25#define DISP_AAL_SIZE_HSIZE				GENMASK(28, 16)
26#define DISP_AAL_SIZE_VSIZE				GENMASK(12, 0)
27#define DISP_AAL_OUTPUT_SIZE			0x04d8
28#define DISP_AAL_GAMMA_LUT			0x0700
29#define DISP_AAL_GAMMA_LUT_R				GENMASK(29, 20)
30#define DISP_AAL_GAMMA_LUT_G				GENMASK(19, 10)
31#define DISP_AAL_GAMMA_LUT_B				GENMASK(9, 0)
32#define DISP_AAL_LUT_BITS			10
33#define DISP_AAL_LUT_SIZE			512
34
35struct mtk_disp_aal_data {
36	bool has_gamma;
37};
38
39 /**
40  * struct mtk_disp_aal - Display Adaptive Ambient Light driver structure
41  * @clk:      clock for DISP_AAL controller
42  * @regs:     MMIO registers base
43  * @cmdq_reg: CMDQ Client register
44  * @data:     platform specific data for DISP_AAL
45  */
46struct mtk_disp_aal {
47	struct clk *clk;
48	void __iomem *regs;
49	struct cmdq_client_reg cmdq_reg;
50	const struct mtk_disp_aal_data *data;
51};
52
53int mtk_aal_clk_enable(struct device *dev)
54{
55	struct mtk_disp_aal *aal = dev_get_drvdata(dev);
56
57	return clk_prepare_enable(aal->clk);
58}
59
60void mtk_aal_clk_disable(struct device *dev)
61{
62	struct mtk_disp_aal *aal = dev_get_drvdata(dev);
63
64	clk_disable_unprepare(aal->clk);
65}
66
67void mtk_aal_config(struct device *dev, unsigned int w,
68			   unsigned int h, unsigned int vrefresh,
69			   unsigned int bpc, struct cmdq_pkt *cmdq_pkt)
70{
71	struct mtk_disp_aal *aal = dev_get_drvdata(dev);
72	u32 sz;
73
74	sz = FIELD_PREP(DISP_AAL_SIZE_HSIZE, w);
75	sz |= FIELD_PREP(DISP_AAL_SIZE_VSIZE, h);
76
77	mtk_ddp_write(cmdq_pkt, sz, &aal->cmdq_reg, aal->regs, DISP_AAL_SIZE);
78	mtk_ddp_write(cmdq_pkt, sz, &aal->cmdq_reg, aal->regs, DISP_AAL_OUTPUT_SIZE);
79}
80
81/**
82 * mtk_aal_gamma_get_lut_size() - Get gamma LUT size for AAL
83 * @dev: Pointer to struct device
84 *
85 * Return: 0 if gamma control not supported in AAL or gamma LUT size
86 */
87unsigned int mtk_aal_gamma_get_lut_size(struct device *dev)
88{
89	struct mtk_disp_aal *aal = dev_get_drvdata(dev);
90
91	if (aal->data && aal->data->has_gamma)
92		return DISP_AAL_LUT_SIZE;
93	return 0;
94}
95
96void mtk_aal_gamma_set(struct device *dev, struct drm_crtc_state *state)
97{
98	struct mtk_disp_aal *aal = dev_get_drvdata(dev);
99	struct drm_color_lut *lut;
100	unsigned int i;
101	u32 cfg_val;
102
103	/* If gamma is not supported in AAL, go out immediately */
104	if (!(aal->data && aal->data->has_gamma))
105		return;
106
107	/* Also, if there's no gamma lut there's nothing to do here. */
108	if (!state->gamma_lut)
109		return;
110
111	lut = (struct drm_color_lut *)state->gamma_lut->data;
112	for (i = 0; i < DISP_AAL_LUT_SIZE; i++) {
113		struct drm_color_lut hwlut = {
114			.red = drm_color_lut_extract(lut[i].red, DISP_AAL_LUT_BITS),
115			.green = drm_color_lut_extract(lut[i].green, DISP_AAL_LUT_BITS),
116			.blue = drm_color_lut_extract(lut[i].blue, DISP_AAL_LUT_BITS)
117		};
118		u32 word;
119
120		word = FIELD_PREP(DISP_AAL_GAMMA_LUT_R, hwlut.red);
121		word |= FIELD_PREP(DISP_AAL_GAMMA_LUT_G, hwlut.green);
122		word |= FIELD_PREP(DISP_AAL_GAMMA_LUT_B, hwlut.blue);
123		writel(word, aal->regs + DISP_AAL_GAMMA_LUT + i * 4);
124	}
125
126	cfg_val = readl(aal->regs + DISP_AAL_CFG);
127
128	/* Enable the gamma table */
129	cfg_val |= FIELD_PREP(AAL_GAMMA_LUT_EN, 1);
130
131	/* Disable RELAY mode to pass the processed image */
132	cfg_val &= ~AAL_RELAY_MODE;
133
134	writel(cfg_val, aal->regs + DISP_AAL_CFG);
135}
136
137void mtk_aal_start(struct device *dev)
138{
139	struct mtk_disp_aal *aal = dev_get_drvdata(dev);
140
141	writel(AAL_EN, aal->regs + DISP_AAL_EN);
142}
143
144void mtk_aal_stop(struct device *dev)
145{
146	struct mtk_disp_aal *aal = dev_get_drvdata(dev);
147
148	writel_relaxed(0x0, aal->regs + DISP_AAL_EN);
149}
150
151static int mtk_disp_aal_bind(struct device *dev, struct device *master,
152			       void *data)
153{
154	return 0;
155}
156
157static void mtk_disp_aal_unbind(struct device *dev, struct device *master,
158				  void *data)
159{
160}
161
162static const struct component_ops mtk_disp_aal_component_ops = {
163	.bind	= mtk_disp_aal_bind,
164	.unbind = mtk_disp_aal_unbind,
165};
166
167static int mtk_disp_aal_probe(struct platform_device *pdev)
168{
169	struct device *dev = &pdev->dev;
170	struct mtk_disp_aal *priv;
171	int ret;
172
173	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
174	if (!priv)
175		return -ENOMEM;
176
177	priv->clk = devm_clk_get(dev, NULL);
178	if (IS_ERR(priv->clk)) {
179		dev_err(dev, "failed to get aal clk\n");
180		return PTR_ERR(priv->clk);
181	}
182
183	priv->regs = devm_platform_ioremap_resource(pdev, 0);
184	if (IS_ERR(priv->regs)) {
185		dev_err(dev, "failed to ioremap aal\n");
186		return PTR_ERR(priv->regs);
187	}
188
189#if IS_REACHABLE(CONFIG_MTK_CMDQ)
190	ret = cmdq_dev_get_client_reg(dev, &priv->cmdq_reg, 0);
191	if (ret)
192		dev_dbg(dev, "get mediatek,gce-client-reg fail!\n");
193#endif
194
195	priv->data = of_device_get_match_data(dev);
196	platform_set_drvdata(pdev, priv);
197
198	ret = component_add(dev, &mtk_disp_aal_component_ops);
199	if (ret)
200		dev_err(dev, "Failed to add component: %d\n", ret);
201
202	return ret;
203}
204
205static void mtk_disp_aal_remove(struct platform_device *pdev)
206{
207	component_del(&pdev->dev, &mtk_disp_aal_component_ops);
208}
209
210static const struct mtk_disp_aal_data mt8173_aal_driver_data = {
211	.has_gamma = true,
212};
213
214static const struct of_device_id mtk_disp_aal_driver_dt_match[] = {
215	{ .compatible = "mediatek,mt8173-disp-aal", .data = &mt8173_aal_driver_data },
216	{ .compatible = "mediatek,mt8183-disp-aal" },
217	{ /* sentinel */ }
218};
219MODULE_DEVICE_TABLE(of, mtk_disp_aal_driver_dt_match);
220
221struct platform_driver mtk_disp_aal_driver = {
222	.probe		= mtk_disp_aal_probe,
223	.remove_new	= mtk_disp_aal_remove,
224	.driver		= {
225		.name	= "mediatek-disp-aal",
226		.owner	= THIS_MODULE,
227		.of_match_table = mtk_disp_aal_driver_dt_match,
228	},
229};
230