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 
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 
13 void mtk_mipi_tx_clear_bits(struct mtk_mipi_tx *mipi_tx, u32 offset,
14 			    u32 bits)
15 {
16 	u32 temp = readl(mipi_tx->regs + offset);
17 
18 	writel(temp & ~bits, mipi_tx->regs + offset);
19 }
20 
21 void mtk_mipi_tx_set_bits(struct mtk_mipi_tx *mipi_tx, u32 offset,
22 			  u32 bits)
23 {
24 	u32 temp = readl(mipi_tx->regs + offset);
25 
26 	writel(temp | bits, mipi_tx->regs + offset);
27 }
28 
29 void mtk_mipi_tx_update_bits(struct mtk_mipi_tx *mipi_tx, u32 offset,
30 			     u32 mask, u32 data)
31 {
32 	u32 temp = readl(mipi_tx->regs + offset);
33 
34 	writel((temp & ~mask) | (data & mask), mipi_tx->regs + offset);
35 }
36 
37 int mtk_mipi_tx_pll_set_rate(struct clk_hw *hw, unsigned long rate,
38 			     unsigned long parent_rate)
39 {
40 	struct mtk_mipi_tx *mipi_tx = mtk_mipi_tx_from_clk_hw(hw);
41 
42 	dev_dbg(mipi_tx->dev, "set rate: %lu Hz\n", rate);
43 
44 	mipi_tx->data_rate = rate;
45 
46 	return 0;
47 }
48 
49 unsigned long mtk_mipi_tx_pll_recalc_rate(struct clk_hw *hw,
50 					  unsigned long parent_rate)
51 {
52 	struct mtk_mipi_tx *mipi_tx = mtk_mipi_tx_from_clk_hw(hw);
53 
54 	return mipi_tx->data_rate;
55 }
56 
57 static int mtk_mipi_tx_power_on(struct phy *phy)
58 {
59 	struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy);
60 	int ret;
61 
62 	/* Power up core and enable PLL */
63 	ret = clk_prepare_enable(mipi_tx->pll);
64 	if (ret < 0)
65 		return ret;
66 
67 	/* Enable DSI Lane LDO outputs, disable pad tie low */
68 	mipi_tx->driver_data->mipi_tx_enable_signal(phy);
69 	return 0;
70 }
71 
72 static int mtk_mipi_tx_power_off(struct phy *phy)
73 {
74 	struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy);
75 
76 	/* Enable pad tie low, disable DSI Lane LDO outputs */
77 	mipi_tx->driver_data->mipi_tx_disable_signal(phy);
78 
79 	/* Disable PLL and power down core */
80 	clk_disable_unprepare(mipi_tx->pll);
81 
82 	return 0;
83 }
84 
85 static const struct phy_ops mtk_mipi_tx_ops = {
86 	.power_on = mtk_mipi_tx_power_on,
87 	.power_off = mtk_mipi_tx_power_off,
88 	.owner = THIS_MODULE,
89 };
90 
91 static void mtk_mipi_tx_get_calibration_datal(struct mtk_mipi_tx *mipi_tx)
92 {
93 	struct nvmem_cell *cell;
94 	size_t len;
95 	u32 *buf;
96 
97 	cell = nvmem_cell_get(mipi_tx->dev, "calibration-data");
98 	if (IS_ERR(cell)) {
99 		dev_info(mipi_tx->dev, "can't get nvmem_cell_get, ignore it\n");
100 		return;
101 	}
102 	buf = (u32 *)nvmem_cell_read(cell, &len);
103 	nvmem_cell_put(cell);
104 
105 	if (IS_ERR(buf)) {
106 		dev_info(mipi_tx->dev, "can't get data, ignore it\n");
107 		return;
108 	}
109 
110 	if (len < 3 * sizeof(u32)) {
111 		dev_info(mipi_tx->dev, "invalid calibration data\n");
112 		kfree(buf);
113 		return;
114 	}
115 
116 	mipi_tx->rt_code[0] = ((buf[0] >> 6 & 0x1f) << 5) |
117 			       (buf[0] >> 11 & 0x1f);
118 	mipi_tx->rt_code[1] = ((buf[1] >> 27 & 0x1f) << 5) |
119 			       (buf[0] >> 1 & 0x1f);
120 	mipi_tx->rt_code[2] = ((buf[1] >> 17 & 0x1f) << 5) |
121 			       (buf[1] >> 22 & 0x1f);
122 	mipi_tx->rt_code[3] = ((buf[1] >> 7 & 0x1f) << 5) |
123 			       (buf[1] >> 12 & 0x1f);
124 	mipi_tx->rt_code[4] = ((buf[2] >> 27 & 0x1f) << 5) |
125 			       (buf[1] >> 2 & 0x1f);
126 	kfree(buf);
127 }
128 
129 static int mtk_mipi_tx_probe(struct platform_device *pdev)
130 {
131 	struct device *dev = &pdev->dev;
132 	struct mtk_mipi_tx *mipi_tx;
133 	struct resource *mem;
134 	const char *ref_clk_name;
135 	struct clk *ref_clk;
136 	struct clk_init_data clk_init = {
137 		.num_parents = 1,
138 		.parent_names = (const char * const *)&ref_clk_name,
139 		.flags = CLK_SET_RATE_GATE,
140 	};
141 	struct phy *phy;
142 	struct phy_provider *phy_provider;
143 	int ret;
144 
145 	mipi_tx = devm_kzalloc(dev, sizeof(*mipi_tx), GFP_KERNEL);
146 	if (!mipi_tx)
147 		return -ENOMEM;
148 
149 	mipi_tx->driver_data = of_device_get_match_data(dev);
150 
151 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
152 	mipi_tx->regs = devm_ioremap_resource(dev, mem);
153 	if (IS_ERR(mipi_tx->regs)) {
154 		ret = PTR_ERR(mipi_tx->regs);
155 		dev_err(dev, "Failed to get memory resource: %d\n", ret);
156 		return ret;
157 	}
158 
159 	ref_clk = devm_clk_get(dev, NULL);
160 	if (IS_ERR(ref_clk)) {
161 		ret = PTR_ERR(ref_clk);
162 		dev_err(dev, "Failed to get reference clock: %d\n", ret);
163 		return ret;
164 	}
165 
166 	ret = of_property_read_u32(dev->of_node, "drive-strength-microamp",
167 				   &mipi_tx->mipitx_drive);
168 	/* If can't get the "mipi_tx->mipitx_drive", set it default 0x8 */
169 	if (ret < 0)
170 		mipi_tx->mipitx_drive = 4600;
171 
172 	/* check the mipitx_drive valid */
173 	if (mipi_tx->mipitx_drive > 6000 || mipi_tx->mipitx_drive < 3000) {
174 		dev_warn(dev, "drive-strength-microamp is invalid %d, not in 3000 ~ 6000\n",
175 			 mipi_tx->mipitx_drive);
176 		mipi_tx->mipitx_drive = clamp_val(mipi_tx->mipitx_drive, 3000,
177 						  6000);
178 	}
179 
180 	ref_clk_name = __clk_get_name(ref_clk);
181 
182 	ret = of_property_read_string(dev->of_node, "clock-output-names",
183 				      &clk_init.name);
184 	if (ret < 0) {
185 		dev_err(dev, "Failed to read clock-output-names: %d\n", ret);
186 		return ret;
187 	}
188 
189 	clk_init.ops = mipi_tx->driver_data->mipi_tx_clk_ops;
190 
191 	mipi_tx->pll_hw.init = &clk_init;
192 	mipi_tx->pll = devm_clk_register(dev, &mipi_tx->pll_hw);
193 	if (IS_ERR(mipi_tx->pll)) {
194 		ret = PTR_ERR(mipi_tx->pll);
195 		dev_err(dev, "Failed to register PLL: %d\n", ret);
196 		return ret;
197 	}
198 
199 	phy = devm_phy_create(dev, NULL, &mtk_mipi_tx_ops);
200 	if (IS_ERR(phy)) {
201 		ret = PTR_ERR(phy);
202 		dev_err(dev, "Failed to create MIPI D-PHY: %d\n", ret);
203 		return ret;
204 	}
205 	phy_set_drvdata(phy, mipi_tx);
206 
207 	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
208 	if (IS_ERR(phy_provider)) {
209 		ret = PTR_ERR(phy_provider);
210 		return ret;
211 	}
212 
213 	mipi_tx->dev = dev;
214 
215 	mtk_mipi_tx_get_calibration_datal(mipi_tx);
216 
217 	return of_clk_add_provider(dev->of_node, of_clk_src_simple_get,
218 				   mipi_tx->pll);
219 }
220 
221 static int mtk_mipi_tx_remove(struct platform_device *pdev)
222 {
223 	of_clk_del_provider(pdev->dev.of_node);
224 	return 0;
225 }
226 
227 static const struct of_device_id mtk_mipi_tx_match[] = {
228 	{ .compatible = "mediatek,mt2701-mipi-tx",
229 	  .data = &mt2701_mipitx_data },
230 	{ .compatible = "mediatek,mt8173-mipi-tx",
231 	  .data = &mt8173_mipitx_data },
232 	{ .compatible = "mediatek,mt8183-mipi-tx",
233 	  .data = &mt8183_mipitx_data },
234 	{ },
235 };
236 MODULE_DEVICE_TABLE(of, mtk_mipi_tx_match);
237 
238 static struct platform_driver mtk_mipi_tx_driver = {
239 	.probe = mtk_mipi_tx_probe,
240 	.remove = mtk_mipi_tx_remove,
241 	.driver = {
242 		.name = "mediatek-mipi-tx",
243 		.of_match_table = mtk_mipi_tx_match,
244 	},
245 };
246 module_platform_driver(mtk_mipi_tx_driver);
247 
248 MODULE_DESCRIPTION("MediaTek MIPI TX Driver");
249 MODULE_LICENSE("GPL v2");
250