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
 23struct 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
 30static 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
 42static 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
 65static const struct dw_hdmi_plat_data rcar_dw_hdmi_plat_data = {
 66	.configure_phy	= rcar_hdmi_phy_configure,
 67};
 68
 69static 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
 82static 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
 91static const struct of_device_id rcar_dw_hdmi_of_table[] = {
 92	{ .compatible = "renesas,rcar-gen3-hdmi" },
 93	{ /* Sentinel */ },
 94};
 95MODULE_DEVICE_TABLE(of, rcar_dw_hdmi_of_table);
 96
 97static 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
106module_platform_driver(rcar_dw_hdmi_platform_driver);
107
108MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
109MODULE_DESCRIPTION("Renesas R-Car Gen3 HDMI Encoder Driver");
110MODULE_LICENSE("GPL");