1 /*
2 * R-Car Gen3 HDMI PHY
3 *
4 * Copyright (C) 2016 Renesas Electronics Corporation
5 *
6 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16
17 #include <drm/bridge/dw_hdmi.h>
18
19 #define RCAR_HDMI_PHY_OPMODE_PLLCFG 0x06 /* Mode of operation and PLL dividers */
20 #define RCAR_HDMI_PHY_PLLCURRGMPCTRL 0x10 /* PLL current and Gmp (conductance) */
21 #define RCAR_HDMI_PHY_PLLDIVCTRL 0x11 /* PLL dividers */
22
23 struct rcar_hdmi_phy_params {
24 unsigned long mpixelclock;
25 u16 opmode_div; /* Mode of operation and PLL dividers */
26 u16 curr_gmp; /* PLL current and Gmp (conductance) */
27 u16 div; /* PLL dividers */
28 };
29
30 static const struct rcar_hdmi_phy_params rcar_hdmi_phy_params[] = {
31 { 35500000, 0x0003, 0x0344, 0x0328 },
32 { 44900000, 0x0003, 0x0285, 0x0128 },
33 { 71000000, 0x0002, 0x1184, 0x0314 },
34 { 90000000, 0x0002, 0x1144, 0x0114 },
35 { 140250000, 0x0001, 0x20c4, 0x030a },
36 { 182750000, 0x0001, 0x2084, 0x010a },
37 { 281250000, 0x0000, 0x0084, 0x0305 },
38 { 297000000, 0x0000, 0x0084, 0x0105 },
39 { ~0UL, 0x0000, 0x0000, 0x0000 },
40 };
41
rcar_hdmi_phy_configure(struct dw_hdmi * hdmi,const struct dw_hdmi_plat_data * pdata,unsigned long mpixelclock)42 static int rcar_hdmi_phy_configure(struct dw_hdmi *hdmi,
43 const struct dw_hdmi_plat_data *pdata,
44 unsigned long mpixelclock)
45 {
46 const struct rcar_hdmi_phy_params *params = rcar_hdmi_phy_params;
47
48 for (; params->mpixelclock != ~0UL; ++params) {
49 if (mpixelclock <= params->mpixelclock)
50 break;
51 }
52
53 if (params->mpixelclock == ~0UL)
54 return -EINVAL;
55
56 dw_hdmi_phy_i2c_write(hdmi, params->opmode_div,
57 RCAR_HDMI_PHY_OPMODE_PLLCFG);
58 dw_hdmi_phy_i2c_write(hdmi, params->curr_gmp,
59 RCAR_HDMI_PHY_PLLCURRGMPCTRL);
60 dw_hdmi_phy_i2c_write(hdmi, params->div, RCAR_HDMI_PHY_PLLDIVCTRL);
61
62 return 0;
63 }
64
65 static const struct dw_hdmi_plat_data rcar_dw_hdmi_plat_data = {
66 .configure_phy = rcar_hdmi_phy_configure,
67 };
68
rcar_dw_hdmi_probe(struct platform_device * pdev)69 static int rcar_dw_hdmi_probe(struct platform_device *pdev)
70 {
71 struct dw_hdmi *hdmi;
72
73 hdmi = dw_hdmi_probe(pdev, &rcar_dw_hdmi_plat_data);
74 if (IS_ERR(hdmi))
75 return PTR_ERR(hdmi);
76
77 platform_set_drvdata(pdev, hdmi);
78
79 return 0;
80 }
81
rcar_dw_hdmi_remove(struct platform_device * pdev)82 static int rcar_dw_hdmi_remove(struct platform_device *pdev)
83 {
84 struct dw_hdmi *hdmi = platform_get_drvdata(pdev);
85
86 dw_hdmi_remove(hdmi);
87
88 return 0;
89 }
90
91 static const struct of_device_id rcar_dw_hdmi_of_table[] = {
92 { .compatible = "renesas,rcar-gen3-hdmi" },
93 { /* Sentinel */ },
94 };
95 MODULE_DEVICE_TABLE(of, rcar_dw_hdmi_of_table);
96
97 static struct platform_driver rcar_dw_hdmi_platform_driver = {
98 .probe = rcar_dw_hdmi_probe,
99 .remove = rcar_dw_hdmi_remove,
100 .driver = {
101 .name = "rcar-dw-hdmi",
102 .of_match_table = rcar_dw_hdmi_of_table,
103 },
104 };
105
106 module_platform_driver(rcar_dw_hdmi_platform_driver);
107
108 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
109 MODULE_DESCRIPTION("Renesas R-Car Gen3 HDMI Encoder Driver");
110 MODULE_LICENSE("GPL");
111