1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2015 MediaTek Inc.
4  */
5 
6 #include "phy-mtk-mipi-dsi.h"
7 
mtk_mipi_tx_from_clk_hw(struct clk_hw * hw)8 inline struct mtk_mipi_tx *mtk_mipi_tx_from_clk_hw(struct clk_hw *hw)
9 {
10 	return container_of(hw, struct mtk_mipi_tx, pll_hw);
11 }
12 
mtk_mipi_tx_pll_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)13 int mtk_mipi_tx_pll_set_rate(struct clk_hw *hw, unsigned long rate,
14 			     unsigned long parent_rate)
15 {
16 	struct mtk_mipi_tx *mipi_tx = mtk_mipi_tx_from_clk_hw(hw);
17 
18 	dev_dbg(mipi_tx->dev, "set rate: %lu Hz\n", rate);
19 
20 	mipi_tx->data_rate = rate;
21 
22 	return 0;
23 }
24 
mtk_mipi_tx_pll_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)25 unsigned long mtk_mipi_tx_pll_recalc_rate(struct clk_hw *hw,
26 					  unsigned long parent_rate)
27 {
28 	struct mtk_mipi_tx *mipi_tx = mtk_mipi_tx_from_clk_hw(hw);
29 
30 	return mipi_tx->data_rate;
31 }
32 
mtk_mipi_tx_power_on(struct phy * phy)33 static int mtk_mipi_tx_power_on(struct phy *phy)
34 {
35 	struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy);
36 	int ret;
37 
38 	/* Power up core and enable PLL */
39 	ret = clk_prepare_enable(mipi_tx->pll);
40 	if (ret < 0)
41 		return ret;
42 
43 	/* Enable DSI Lane LDO outputs, disable pad tie low */
44 	mipi_tx->driver_data->mipi_tx_enable_signal(phy);
45 	return 0;
46 }
47 
mtk_mipi_tx_power_off(struct phy * phy)48 static int mtk_mipi_tx_power_off(struct phy *phy)
49 {
50 	struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy);
51 
52 	/* Enable pad tie low, disable DSI Lane LDO outputs */
53 	mipi_tx->driver_data->mipi_tx_disable_signal(phy);
54 
55 	/* Disable PLL and power down core */
56 	clk_disable_unprepare(mipi_tx->pll);
57 
58 	return 0;
59 }
60 
61 static const struct phy_ops mtk_mipi_tx_ops = {
62 	.power_on = mtk_mipi_tx_power_on,
63 	.power_off = mtk_mipi_tx_power_off,
64 	.owner = THIS_MODULE,
65 };
66 
mtk_mipi_tx_get_calibration_datal(struct mtk_mipi_tx * mipi_tx)67 static void mtk_mipi_tx_get_calibration_datal(struct mtk_mipi_tx *mipi_tx)
68 {
69 	struct nvmem_cell *cell;
70 	size_t len;
71 	u32 *buf;
72 
73 	cell = nvmem_cell_get(mipi_tx->dev, "calibration-data");
74 	if (IS_ERR(cell)) {
75 		dev_info(mipi_tx->dev, "can't get nvmem_cell_get, ignore it\n");
76 		return;
77 	}
78 	buf = (u32 *)nvmem_cell_read(cell, &len);
79 	nvmem_cell_put(cell);
80 
81 	if (IS_ERR(buf)) {
82 		dev_info(mipi_tx->dev, "can't get data, ignore it\n");
83 		return;
84 	}
85 
86 	if (len < 3 * sizeof(u32)) {
87 		dev_info(mipi_tx->dev, "invalid calibration data\n");
88 		kfree(buf);
89 		return;
90 	}
91 
92 	mipi_tx->rt_code[0] = ((buf[0] >> 6 & 0x1f) << 5) |
93 			       (buf[0] >> 11 & 0x1f);
94 	mipi_tx->rt_code[1] = ((buf[1] >> 27 & 0x1f) << 5) |
95 			       (buf[0] >> 1 & 0x1f);
96 	mipi_tx->rt_code[2] = ((buf[1] >> 17 & 0x1f) << 5) |
97 			       (buf[1] >> 22 & 0x1f);
98 	mipi_tx->rt_code[3] = ((buf[1] >> 7 & 0x1f) << 5) |
99 			       (buf[1] >> 12 & 0x1f);
100 	mipi_tx->rt_code[4] = ((buf[2] >> 27 & 0x1f) << 5) |
101 			       (buf[1] >> 2 & 0x1f);
102 	kfree(buf);
103 }
104 
mtk_mipi_tx_probe(struct platform_device * pdev)105 static int mtk_mipi_tx_probe(struct platform_device *pdev)
106 {
107 	struct device *dev = &pdev->dev;
108 	struct mtk_mipi_tx *mipi_tx;
109 	const char *ref_clk_name;
110 	struct clk *ref_clk;
111 	struct clk_init_data clk_init = {
112 		.num_parents = 1,
113 		.parent_names = (const char * const *)&ref_clk_name,
114 		.flags = CLK_SET_RATE_GATE,
115 	};
116 	struct phy *phy;
117 	struct phy_provider *phy_provider;
118 	int ret;
119 
120 	mipi_tx = devm_kzalloc(dev, sizeof(*mipi_tx), GFP_KERNEL);
121 	if (!mipi_tx)
122 		return -ENOMEM;
123 
124 	mipi_tx->driver_data = of_device_get_match_data(dev);
125 	if (!mipi_tx->driver_data)
126 		return -ENODEV;
127 
128 	mipi_tx->regs = devm_platform_ioremap_resource(pdev, 0);
129 	if (IS_ERR(mipi_tx->regs))
130 		return PTR_ERR(mipi_tx->regs);
131 
132 	ref_clk = devm_clk_get(dev, NULL);
133 	if (IS_ERR(ref_clk))
134 		return dev_err_probe(dev, PTR_ERR(ref_clk),
135 				     "Failed to get reference clock\n");
136 
137 	ret = of_property_read_u32(dev->of_node, "drive-strength-microamp",
138 				   &mipi_tx->mipitx_drive);
139 	/* If can't get the "mipi_tx->mipitx_drive", set it default 0x8 */
140 	if (ret < 0)
141 		mipi_tx->mipitx_drive = 4600;
142 
143 	/* check the mipitx_drive valid */
144 	if (mipi_tx->mipitx_drive > 6000 || mipi_tx->mipitx_drive < 3000) {
145 		dev_warn(dev, "drive-strength-microamp is invalid %d, not in 3000 ~ 6000\n",
146 			 mipi_tx->mipitx_drive);
147 		mipi_tx->mipitx_drive = clamp_val(mipi_tx->mipitx_drive, 3000,
148 						  6000);
149 	}
150 
151 	ref_clk_name = __clk_get_name(ref_clk);
152 
153 	ret = of_property_read_string(dev->of_node, "clock-output-names",
154 				      &clk_init.name);
155 	if (ret < 0)
156 		return dev_err_probe(dev, ret, "Failed to read clock-output-names\n");
157 
158 	clk_init.ops = mipi_tx->driver_data->mipi_tx_clk_ops;
159 
160 	mipi_tx->pll_hw.init = &clk_init;
161 	mipi_tx->pll = devm_clk_register(dev, &mipi_tx->pll_hw);
162 	if (IS_ERR(mipi_tx->pll))
163 		return dev_err_probe(dev, PTR_ERR(mipi_tx->pll), "Failed to register PLL\n");
164 
165 	phy = devm_phy_create(dev, NULL, &mtk_mipi_tx_ops);
166 	if (IS_ERR(phy))
167 		return dev_err_probe(dev, PTR_ERR(phy), "Failed to create MIPI D-PHY\n");
168 
169 	phy_set_drvdata(phy, mipi_tx);
170 
171 	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
172 	if (IS_ERR(phy_provider))
173 		return PTR_ERR(phy_provider);
174 
175 	mipi_tx->dev = dev;
176 
177 	mtk_mipi_tx_get_calibration_datal(mipi_tx);
178 
179 	return of_clk_add_provider(dev->of_node, of_clk_src_simple_get,
180 				   mipi_tx->pll);
181 }
182 
mtk_mipi_tx_remove(struct platform_device * pdev)183 static int mtk_mipi_tx_remove(struct platform_device *pdev)
184 {
185 	of_clk_del_provider(pdev->dev.of_node);
186 	return 0;
187 }
188 
189 static const struct of_device_id mtk_mipi_tx_match[] = {
190 	{ .compatible = "mediatek,mt2701-mipi-tx",
191 	  .data = &mt2701_mipitx_data },
192 	{ .compatible = "mediatek,mt8173-mipi-tx",
193 	  .data = &mt8173_mipitx_data },
194 	{ .compatible = "mediatek,mt8183-mipi-tx",
195 	  .data = &mt8183_mipitx_data },
196 	{ },
197 };
198 MODULE_DEVICE_TABLE(of, mtk_mipi_tx_match);
199 
200 static struct platform_driver mtk_mipi_tx_driver = {
201 	.probe = mtk_mipi_tx_probe,
202 	.remove = mtk_mipi_tx_remove,
203 	.driver = {
204 		.name = "mediatek-mipi-tx",
205 		.of_match_table = mtk_mipi_tx_match,
206 	},
207 };
208 module_platform_driver(mtk_mipi_tx_driver);
209 
210 MODULE_DESCRIPTION("MediaTek MIPI TX Driver");
211 MODULE_LICENSE("GPL v2");
212