cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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rcar_dw_hdmi.c (3314B)

      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 * R-Car Gen3 HDMI PHY
      4 *
      5 * Copyright (C) 2016 Renesas Electronics Corporation
      6 *
      7 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
      8 */
      9
     10#include <linux/mod_devicetable.h>
     11#include <linux/module.h>
     12#include <linux/platform_device.h>
     13
     14#include <drm/bridge/dw_hdmi.h>
     15#include <drm/drm_modes.h>
     16
     17#define RCAR_HDMI_PHY_OPMODE_PLLCFG	0x06	/* Mode of operation and PLL dividers */
     18#define RCAR_HDMI_PHY_PLLCURRGMPCTRL	0x10	/* PLL current and Gmp (conductance) */
     19#define RCAR_HDMI_PHY_PLLDIVCTRL	0x11	/* PLL dividers */
     20
     21struct rcar_hdmi_phy_params {
     22	unsigned long mpixelclock;
     23	u16 opmode_div;	/* Mode of operation and PLL dividers */
     24	u16 curr_gmp;	/* PLL current and Gmp (conductance) */
     25	u16 div;	/* PLL dividers */
     26};
     27
     28static const struct rcar_hdmi_phy_params rcar_hdmi_phy_params[] = {
     29	{ 35500000,  0x0003, 0x0344, 0x0328 },
     30	{ 44900000,  0x0003, 0x0285, 0x0128 },
     31	{ 71000000,  0x0002, 0x1184, 0x0314 },
     32	{ 90000000,  0x0002, 0x1144, 0x0114 },
     33	{ 140250000, 0x0001, 0x20c4, 0x030a },
     34	{ 182750000, 0x0001, 0x2084, 0x010a },
     35	{ 281250000, 0x0000, 0x0084, 0x0305 },
     36	{ 297000000, 0x0000, 0x0084, 0x0105 },
     37	{ ~0UL,      0x0000, 0x0000, 0x0000 },
     38};
     39
     40static enum drm_mode_status
     41rcar_hdmi_mode_valid(struct dw_hdmi *hdmi, void *data,
     42		     const struct drm_display_info *info,
     43		     const struct drm_display_mode *mode)
     44{
     45	/*
     46	 * The maximum supported clock frequency is 297 MHz, as shown in the PHY
     47	 * parameters table.
     48	 */
     49	if (mode->clock > 297000)
     50		return MODE_CLOCK_HIGH;
     51
     52	return MODE_OK;
     53}
     54
     55static int rcar_hdmi_phy_configure(struct dw_hdmi *hdmi, void *data,
     56				   unsigned long mpixelclock)
     57{
     58	const struct rcar_hdmi_phy_params *params = rcar_hdmi_phy_params;
     59
     60	for (; params->mpixelclock != ~0UL; ++params) {
     61		if (mpixelclock <= params->mpixelclock)
     62			break;
     63	}
     64
     65	if (params->mpixelclock == ~0UL)
     66		return -EINVAL;
     67
     68	dw_hdmi_phy_i2c_write(hdmi, params->opmode_div,
     69			      RCAR_HDMI_PHY_OPMODE_PLLCFG);
     70	dw_hdmi_phy_i2c_write(hdmi, params->curr_gmp,
     71			      RCAR_HDMI_PHY_PLLCURRGMPCTRL);
     72	dw_hdmi_phy_i2c_write(hdmi, params->div, RCAR_HDMI_PHY_PLLDIVCTRL);
     73
     74	return 0;
     75}
     76
     77static const struct dw_hdmi_plat_data rcar_dw_hdmi_plat_data = {
     78	.output_port = 1,
     79	.mode_valid = rcar_hdmi_mode_valid,
     80	.configure_phy	= rcar_hdmi_phy_configure,
     81};
     82
     83static int rcar_dw_hdmi_probe(struct platform_device *pdev)
     84{
     85	struct dw_hdmi *hdmi;
     86
     87	hdmi = dw_hdmi_probe(pdev, &rcar_dw_hdmi_plat_data);
     88	if (IS_ERR(hdmi))
     89		return PTR_ERR(hdmi);
     90
     91	platform_set_drvdata(pdev, hdmi);
     92
     93	return 0;
     94}
     95
     96static int rcar_dw_hdmi_remove(struct platform_device *pdev)
     97{
     98	struct dw_hdmi *hdmi = platform_get_drvdata(pdev);
     99
    100	dw_hdmi_remove(hdmi);
    101
    102	return 0;
    103}
    104
    105static const struct of_device_id rcar_dw_hdmi_of_table[] = {
    106	{ .compatible = "renesas,rcar-gen3-hdmi" },
    107	{ /* Sentinel */ },
    108};
    109MODULE_DEVICE_TABLE(of, rcar_dw_hdmi_of_table);
    110
    111static struct platform_driver rcar_dw_hdmi_platform_driver = {
    112	.probe		= rcar_dw_hdmi_probe,
    113	.remove		= rcar_dw_hdmi_remove,
    114	.driver		= {
    115		.name	= "rcar-dw-hdmi",
    116		.of_match_table = rcar_dw_hdmi_of_table,
    117	},
    118};
    119
    120module_platform_driver(rcar_dw_hdmi_platform_driver);
    121
    122MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
    123MODULE_DESCRIPTION("Renesas R-Car Gen3 HDMI Encoder Driver");
    124MODULE_LICENSE("GPL");