LXR linux/drivers/gpu/drm/rcar-du/rcar_dw

   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");
 111