1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (c) 2019 MediaTek Inc.
4  * Author: jitao.shi <jitao.shi@mediatek.com>
5  */
6 
7 #include "phy-mtk-io.h"
8 #include "phy-mtk-mipi-dsi.h"
9 
10 #define MIPITX_LANE_CON		0x000c
11 #define RG_DSI_CPHY_T1DRV_EN		BIT(0)
12 #define RG_DSI_ANA_CK_SEL		BIT(1)
13 #define RG_DSI_PHY_CK_SEL		BIT(2)
14 #define RG_DSI_CPHY_EN			BIT(3)
15 #define RG_DSI_PHYCK_INV_EN		BIT(4)
16 #define RG_DSI_PWR04_EN			BIT(5)
17 #define RG_DSI_BG_LPF_EN		BIT(6)
18 #define RG_DSI_BG_CORE_EN		BIT(7)
19 #define RG_DSI_PAD_TIEL_SEL		BIT(8)
20 
21 #define MIPITX_VOLTAGE_SEL	0x0010
22 #define RG_DSI_HSTX_LDO_REF_SEL		GENMASK(9, 6)
23 
24 #define MIPITX_PLL_PWR		0x0028
25 #define MIPITX_PLL_CON0		0x002c
26 #define MIPITX_PLL_CON1		0x0030
27 #define MIPITX_PLL_CON2		0x0034
28 #define MIPITX_PLL_CON3		0x0038
29 #define MIPITX_PLL_CON4		0x003c
30 #define RG_DSI_PLL_IBIAS		GENMASK(11, 10)
31 
32 #define MIPITX_D2P_RTCODE	0x0100
33 #define MIPITX_D2_SW_CTL_EN	0x0144
34 #define MIPITX_D0_SW_CTL_EN	0x0244
35 #define MIPITX_CK_CKMODE_EN	0x0328
36 #define DSI_CK_CKMODE_EN		BIT(0)
37 #define MIPITX_CK_SW_CTL_EN	0x0344
38 #define MIPITX_D1_SW_CTL_EN	0x0444
39 #define MIPITX_D3_SW_CTL_EN	0x0544
40 #define DSI_SW_CTL_EN			BIT(0)
41 #define AD_DSI_PLL_SDM_PWR_ON		BIT(0)
42 #define AD_DSI_PLL_SDM_ISO_EN		BIT(1)
43 
44 #define RG_DSI_PLL_EN			BIT(4)
45 #define RG_DSI_PLL_POSDIV		GENMASK(10, 8)
46 
mtk_mipi_tx_pll_enable(struct clk_hw * hw)47 static int mtk_mipi_tx_pll_enable(struct clk_hw *hw)
48 {
49 	struct mtk_mipi_tx *mipi_tx = mtk_mipi_tx_from_clk_hw(hw);
50 	void __iomem *base = mipi_tx->regs;
51 	unsigned int txdiv, txdiv0;
52 	u64 pcw;
53 
54 	dev_dbg(mipi_tx->dev, "enable: %u bps\n", mipi_tx->data_rate);
55 
56 	if (mipi_tx->data_rate >= 2000000000) {
57 		txdiv = 1;
58 		txdiv0 = 0;
59 	} else if (mipi_tx->data_rate >= 1000000000) {
60 		txdiv = 2;
61 		txdiv0 = 1;
62 	} else if (mipi_tx->data_rate >= 500000000) {
63 		txdiv = 4;
64 		txdiv0 = 2;
65 	} else if (mipi_tx->data_rate > 250000000) {
66 		txdiv = 8;
67 		txdiv0 = 3;
68 	} else if (mipi_tx->data_rate >= 125000000) {
69 		txdiv = 16;
70 		txdiv0 = 4;
71 	} else {
72 		return -EINVAL;
73 	}
74 
75 	mtk_phy_clear_bits(base + MIPITX_PLL_CON4, RG_DSI_PLL_IBIAS);
76 
77 	mtk_phy_set_bits(base + MIPITX_PLL_PWR, AD_DSI_PLL_SDM_PWR_ON);
78 	mtk_phy_clear_bits(base + MIPITX_PLL_CON1, RG_DSI_PLL_EN);
79 	udelay(1);
80 	mtk_phy_clear_bits(base + MIPITX_PLL_PWR, AD_DSI_PLL_SDM_ISO_EN);
81 	pcw = div_u64(((u64)mipi_tx->data_rate * txdiv) << 24, 26000000);
82 	writel(pcw, base + MIPITX_PLL_CON0);
83 	mtk_phy_update_field(base + MIPITX_PLL_CON1, RG_DSI_PLL_POSDIV, txdiv0);
84 	mtk_phy_set_bits(base + MIPITX_PLL_CON1, RG_DSI_PLL_EN);
85 
86 	return 0;
87 }
88 
mtk_mipi_tx_pll_disable(struct clk_hw * hw)89 static void mtk_mipi_tx_pll_disable(struct clk_hw *hw)
90 {
91 	struct mtk_mipi_tx *mipi_tx = mtk_mipi_tx_from_clk_hw(hw);
92 	void __iomem *base = mipi_tx->regs;
93 
94 	mtk_phy_clear_bits(base + MIPITX_PLL_CON1, RG_DSI_PLL_EN);
95 
96 	mtk_phy_set_bits(base + MIPITX_PLL_PWR, AD_DSI_PLL_SDM_ISO_EN);
97 	mtk_phy_clear_bits(base + MIPITX_PLL_PWR, AD_DSI_PLL_SDM_PWR_ON);
98 }
99 
mtk_mipi_tx_pll_round_rate(struct clk_hw * hw,unsigned long rate,unsigned long * prate)100 static long mtk_mipi_tx_pll_round_rate(struct clk_hw *hw, unsigned long rate,
101 				       unsigned long *prate)
102 {
103 	return clamp_val(rate, 125000000, 1600000000);
104 }
105 
106 static const struct clk_ops mtk_mipi_tx_pll_ops = {
107 	.enable = mtk_mipi_tx_pll_enable,
108 	.disable = mtk_mipi_tx_pll_disable,
109 	.round_rate = mtk_mipi_tx_pll_round_rate,
110 	.set_rate = mtk_mipi_tx_pll_set_rate,
111 	.recalc_rate = mtk_mipi_tx_pll_recalc_rate,
112 };
113 
mtk_mipi_tx_config_calibration_data(struct mtk_mipi_tx * mipi_tx)114 static void mtk_mipi_tx_config_calibration_data(struct mtk_mipi_tx *mipi_tx)
115 {
116 	int i, j;
117 
118 	for (i = 0; i < 5; i++) {
119 		if ((mipi_tx->rt_code[i] & 0x1f) == 0)
120 			mipi_tx->rt_code[i] |= 0x10;
121 
122 		if ((mipi_tx->rt_code[i] >> 5 & 0x1f) == 0)
123 			mipi_tx->rt_code[i] |= 0x10 << 5;
124 
125 		for (j = 0; j < 10; j++)
126 			mtk_phy_update_bits(mipi_tx->regs +
127 				MIPITX_D2P_RTCODE * (i + 1) + j * 4,
128 				1, mipi_tx->rt_code[i] >> j & 1);
129 	}
130 }
131 
mtk_mipi_tx_power_on_signal(struct phy * phy)132 static void mtk_mipi_tx_power_on_signal(struct phy *phy)
133 {
134 	struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy);
135 	void __iomem *base = mipi_tx->regs;
136 
137 	/* BG_LPF_EN / BG_CORE_EN */
138 	writel(RG_DSI_PAD_TIEL_SEL | RG_DSI_BG_CORE_EN, base + MIPITX_LANE_CON);
139 	usleep_range(30, 100);
140 	writel(RG_DSI_BG_CORE_EN | RG_DSI_BG_LPF_EN, base + MIPITX_LANE_CON);
141 
142 	/* Switch OFF each Lane */
143 	mtk_phy_clear_bits(base + MIPITX_D0_SW_CTL_EN, DSI_SW_CTL_EN);
144 	mtk_phy_clear_bits(base + MIPITX_D1_SW_CTL_EN, DSI_SW_CTL_EN);
145 	mtk_phy_clear_bits(base + MIPITX_D2_SW_CTL_EN, DSI_SW_CTL_EN);
146 	mtk_phy_clear_bits(base + MIPITX_D3_SW_CTL_EN, DSI_SW_CTL_EN);
147 	mtk_phy_clear_bits(base + MIPITX_CK_SW_CTL_EN, DSI_SW_CTL_EN);
148 
149 	mtk_phy_update_field(base + MIPITX_VOLTAGE_SEL, RG_DSI_HSTX_LDO_REF_SEL,
150 			     (mipi_tx->mipitx_drive - 3000) / 200);
151 
152 	mtk_mipi_tx_config_calibration_data(mipi_tx);
153 
154 	mtk_phy_set_bits(base + MIPITX_CK_CKMODE_EN, DSI_CK_CKMODE_EN);
155 }
156 
mtk_mipi_tx_power_off_signal(struct phy * phy)157 static void mtk_mipi_tx_power_off_signal(struct phy *phy)
158 {
159 	struct mtk_mipi_tx *mipi_tx = phy_get_drvdata(phy);
160 	void __iomem *base = mipi_tx->regs;
161 
162 	/* Switch ON each Lane */
163 	mtk_phy_set_bits(base + MIPITX_D0_SW_CTL_EN, DSI_SW_CTL_EN);
164 	mtk_phy_set_bits(base + MIPITX_D1_SW_CTL_EN, DSI_SW_CTL_EN);
165 	mtk_phy_set_bits(base + MIPITX_D2_SW_CTL_EN, DSI_SW_CTL_EN);
166 	mtk_phy_set_bits(base + MIPITX_D3_SW_CTL_EN, DSI_SW_CTL_EN);
167 	mtk_phy_set_bits(base + MIPITX_CK_SW_CTL_EN, DSI_SW_CTL_EN);
168 
169 	writel(RG_DSI_PAD_TIEL_SEL | RG_DSI_BG_CORE_EN, base + MIPITX_LANE_CON);
170 	writel(RG_DSI_PAD_TIEL_SEL, base + MIPITX_LANE_CON);
171 }
172 
173 const struct mtk_mipitx_data mt8183_mipitx_data = {
174 	.mipi_tx_clk_ops = &mtk_mipi_tx_pll_ops,
175 	.mipi_tx_enable_signal = mtk_mipi_tx_power_on_signal,
176 	.mipi_tx_disable_signal = mtk_mipi_tx_power_off_signal,
177 };
178