1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * HDMI PHY
4  *
5  * Copyright (C) 2013 Texas Instruments Incorporated
6  */
7 
8 #include <linux/kernel.h>
9 #include <linux/err.h>
10 #include <linux/io.h>
11 #include <linux/platform_device.h>
12 #include <linux/slab.h>
13 #include <linux/seq_file.h>
14 
15 #include <video/omapfb_dss.h>
16 
17 #include "dss.h"
18 #include "hdmi.h"
19 
20 struct hdmi_phy_features {
21 	bool bist_ctrl;
22 	bool ldo_voltage;
23 	unsigned long max_phy;
24 };
25 
26 static const struct hdmi_phy_features *phy_feat;
27 
28 void hdmi_phy_dump(struct hdmi_phy_data *phy, struct seq_file *s)
29 {
30 #define DUMPPHY(r) seq_printf(s, "%-35s %08x\n", #r,\
31 		hdmi_read_reg(phy->base, r))
32 
33 	DUMPPHY(HDMI_TXPHY_TX_CTRL);
34 	DUMPPHY(HDMI_TXPHY_DIGITAL_CTRL);
35 	DUMPPHY(HDMI_TXPHY_POWER_CTRL);
36 	DUMPPHY(HDMI_TXPHY_PAD_CFG_CTRL);
37 	if (phy_feat->bist_ctrl)
38 		DUMPPHY(HDMI_TXPHY_BIST_CONTROL);
39 }
40 
41 int hdmi_phy_parse_lanes(struct hdmi_phy_data *phy, const u32 *lanes)
42 {
43 	int i;
44 
45 	for (i = 0; i < 8; i += 2) {
46 		u8 lane, pol;
47 		int dx, dy;
48 
49 		dx = lanes[i];
50 		dy = lanes[i + 1];
51 
52 		if (dx < 0 || dx >= 8)
53 			return -EINVAL;
54 
55 		if (dy < 0 || dy >= 8)
56 			return -EINVAL;
57 
58 		if (dx & 1) {
59 			if (dy != dx - 1)
60 				return -EINVAL;
61 			pol = 1;
62 		} else {
63 			if (dy != dx + 1)
64 				return -EINVAL;
65 			pol = 0;
66 		}
67 
68 		lane = dx / 2;
69 
70 		phy->lane_function[lane] = i / 2;
71 		phy->lane_polarity[lane] = pol;
72 	}
73 
74 	return 0;
75 }
76 
77 static void hdmi_phy_configure_lanes(struct hdmi_phy_data *phy)
78 {
79 	static const u16 pad_cfg_list[] = {
80 		0x0123,
81 		0x0132,
82 		0x0312,
83 		0x0321,
84 		0x0231,
85 		0x0213,
86 		0x1023,
87 		0x1032,
88 		0x3012,
89 		0x3021,
90 		0x2031,
91 		0x2013,
92 		0x1203,
93 		0x1302,
94 		0x3102,
95 		0x3201,
96 		0x2301,
97 		0x2103,
98 		0x1230,
99 		0x1320,
100 		0x3120,
101 		0x3210,
102 		0x2310,
103 		0x2130,
104 	};
105 
106 	u16 lane_cfg = 0;
107 	int i;
108 	unsigned lane_cfg_val;
109 	u16 pol_val = 0;
110 
111 	for (i = 0; i < 4; ++i)
112 		lane_cfg |= phy->lane_function[i] << ((3 - i) * 4);
113 
114 	pol_val |= phy->lane_polarity[0] << 0;
115 	pol_val |= phy->lane_polarity[1] << 3;
116 	pol_val |= phy->lane_polarity[2] << 2;
117 	pol_val |= phy->lane_polarity[3] << 1;
118 
119 	for (i = 0; i < ARRAY_SIZE(pad_cfg_list); ++i)
120 		if (pad_cfg_list[i] == lane_cfg)
121 			break;
122 
123 	if (WARN_ON(i == ARRAY_SIZE(pad_cfg_list)))
124 		i = 0;
125 
126 	lane_cfg_val = i;
127 
128 	REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, lane_cfg_val, 26, 22);
129 	REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, pol_val, 30, 27);
130 }
131 
132 int hdmi_phy_configure(struct hdmi_phy_data *phy, unsigned long hfbitclk,
133 	unsigned long lfbitclk)
134 {
135 	u8 freqout;
136 
137 	/*
138 	 * Read address 0 in order to get the SCP reset done completed
139 	 * Dummy access performed to make sure reset is done
140 	 */
141 	hdmi_read_reg(phy->base, HDMI_TXPHY_TX_CTRL);
142 
143 	/*
144 	 * In OMAP5+, the HFBITCLK must be divided by 2 before issuing the
145 	 * HDMI_PHYPWRCMD_LDOON command.
146 	 */
147 	if (phy_feat->bist_ctrl)
148 		REG_FLD_MOD(phy->base, HDMI_TXPHY_BIST_CONTROL, 1, 11, 11);
149 
150 	/*
151 	 * If the hfbitclk != lfbitclk, it means the lfbitclk was configured
152 	 * to be used for TMDS.
153 	 */
154 	if (hfbitclk != lfbitclk)
155 		freqout = 0;
156 	else if (hfbitclk / 10 < phy_feat->max_phy)
157 		freqout = 1;
158 	else
159 		freqout = 2;
160 
161 	/*
162 	 * Write to phy address 0 to configure the clock
163 	 * use HFBITCLK write HDMI_TXPHY_TX_CONTROL_FREQOUT field
164 	 */
165 	REG_FLD_MOD(phy->base, HDMI_TXPHY_TX_CTRL, freqout, 31, 30);
166 
167 	/* Write to phy address 1 to start HDMI line (TXVALID and TMDSCLKEN) */
168 	hdmi_write_reg(phy->base, HDMI_TXPHY_DIGITAL_CTRL, 0xF0000000);
169 
170 	/* Setup max LDO voltage */
171 	if (phy_feat->ldo_voltage)
172 		REG_FLD_MOD(phy->base, HDMI_TXPHY_POWER_CTRL, 0xB, 3, 0);
173 
174 	hdmi_phy_configure_lanes(phy);
175 
176 	return 0;
177 }
178 
179 static const struct hdmi_phy_features omap44xx_phy_feats = {
180 	.bist_ctrl	=	false,
181 	.ldo_voltage	=	true,
182 	.max_phy	=	185675000,
183 };
184 
185 static const struct hdmi_phy_features omap54xx_phy_feats = {
186 	.bist_ctrl	=	true,
187 	.ldo_voltage	=	false,
188 	.max_phy	=	186000000,
189 };
190 
191 static const struct hdmi_phy_features *hdmi_phy_get_features(void)
192 {
193 	switch (omapdss_get_version()) {
194 	case OMAPDSS_VER_OMAP4430_ES1:
195 	case OMAPDSS_VER_OMAP4430_ES2:
196 	case OMAPDSS_VER_OMAP4:
197 		return &omap44xx_phy_feats;
198 
199 	case OMAPDSS_VER_OMAP5:
200 	case OMAPDSS_VER_DRA7xx:
201 		return &omap54xx_phy_feats;
202 
203 	default:
204 		return NULL;
205 	}
206 }
207 
208 int hdmi_phy_init(struct platform_device *pdev, struct hdmi_phy_data *phy)
209 {
210 	phy_feat = hdmi_phy_get_features();
211 	if (!phy_feat)
212 		return -ENODEV;
213 
214 	phy->base = devm_platform_ioremap_resource_byname(pdev, "phy");
215 	if (IS_ERR(phy->base)) {
216 		DSSERR("can't ioremap TX PHY\n");
217 		return PTR_ERR(phy->base);
218 	}
219 
220 	return 0;
221 }
222