drivers/gpu/drm/omapdrm/dss/hdmi_phy.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HDMI PHY
   4  *
   5  * Copyright (C) 2013 Texas Instruments Incorporated - https://www.ti.com/
   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 "omapdss.h"
  16 #include "dss.h"
  17 #include "hdmi.h"
  18
  19 void hdmi_phy_dump(struct hdmi_phy_data *phy, struct seq_file *s)
  20 {
  21 #define DUMPPHY(r) seq_printf(s, "%-35s %08x\n", #r,\
  22                 hdmi_read_reg(phy->base, r))
  23
  24         DUMPPHY(HDMI_TXPHY_TX_CTRL);
  25         DUMPPHY(HDMI_TXPHY_DIGITAL_CTRL);
  26         DUMPPHY(HDMI_TXPHY_POWER_CTRL);
  27         DUMPPHY(HDMI_TXPHY_PAD_CFG_CTRL);
  28         if (phy->features->bist_ctrl)
  29                 DUMPPHY(HDMI_TXPHY_BIST_CONTROL);
  30 }
  31
  32 int hdmi_phy_parse_lanes(struct hdmi_phy_data *phy, const u32 *lanes)
  33 {
  34         int i;
  35
  36         for (i = 0; i < 8; i += 2) {
  37                 u8 lane, pol;
  38                 int dx, dy;
  39
  40                 dx = lanes[i];
  41                 dy = lanes[i + 1];
  42
  43                 if (dx < 0 || dx >= 8)
  44                         return -EINVAL;
  45
  46                 if (dy < 0 || dy >= 8)
  47                         return -EINVAL;
  48
  49                 if (dx & 1) {
  50                         if (dy != dx - 1)
  51                                 return -EINVAL;
  52                         pol = 1;
  53                 } else {
  54                         if (dy != dx + 1)
  55                                 return -EINVAL;
  56                         pol = 0;
  57                 }
  58
  59                 lane = dx / 2;
  60
  61                 phy->lane_function[lane] = i / 2;
  62                 phy->lane_polarity[lane] = pol;
  63         }
  64
  65         return 0;
  66 }
  67
  68 static void hdmi_phy_configure_lanes(struct hdmi_phy_data *phy)
  69 {
  70         static const u16 pad_cfg_list[] = {
  71                 0x0123,
  72                 0x0132,
  73                 0x0312,
  74                 0x0321,
  75                 0x0231,
  76                 0x0213,
  77                 0x1023,
  78                 0x1032,
  79                 0x3012,
  80                 0x3021,
  81                 0x2031,
  82                 0x2013,
  83                 0x1203,
  84                 0x1302,
  85                 0x3102,
  86                 0x3201,
  87                 0x2301,
  88                 0x2103,
  89                 0x1230,
  90                 0x1320,
  91                 0x3120,
  92                 0x3210,
  93                 0x2310,
  94                 0x2130,
  95         };
  96
  97         u16 lane_cfg = 0;
  98         int i;
  99         unsigned int lane_cfg_val;
 100         u16 pol_val = 0;
 101
 102         for (i = 0; i < 4; ++i)
 103                 lane_cfg |= phy->lane_function[i] << ((3 - i) * 4);
 104
 105         pol_val |= phy->lane_polarity[0] << 0;
 106         pol_val |= phy->lane_polarity[1] << 3;
 107         pol_val |= phy->lane_polarity[2] << 2;
 108         pol_val |= phy->lane_polarity[3] << 1;
 109
 110         for (i = 0; i < ARRAY_SIZE(pad_cfg_list); ++i)
 111                 if (pad_cfg_list[i] == lane_cfg)
 112                         break;
 113
 114         if (WARN_ON(i == ARRAY_SIZE(pad_cfg_list)))
 115                 i = 0;
 116
 117         lane_cfg_val = i;
 118
 119         REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, lane_cfg_val, 26, 22);
 120         REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, pol_val, 30, 27);
 121 }
 122
 123 int hdmi_phy_configure(struct hdmi_phy_data *phy, unsigned long hfbitclk,
 124         unsigned long lfbitclk)
 125 {
 126         u8 freqout;
 127
 128         /*
 129          * Read address 0 in order to get the SCP reset done completed
 130          * Dummy access performed to make sure reset is done
 131          */
 132         hdmi_read_reg(phy->base, HDMI_TXPHY_TX_CTRL);
 133
 134         /*
 135          * In OMAP5+, the HFBITCLK must be divided by 2 before issuing the
 136          * HDMI_PHYPWRCMD_LDOON command.
 137         */
 138         if (phy->features->bist_ctrl)
 139                 REG_FLD_MOD(phy->base, HDMI_TXPHY_BIST_CONTROL, 1, 11, 11);
 140
 141         /*
 142          * If the hfbitclk != lfbitclk, it means the lfbitclk was configured
 143          * to be used for TMDS.
 144          */
 145         if (hfbitclk != lfbitclk)
 146                 freqout = 0;
 147         else if (hfbitclk / 10 < phy->features->max_phy)
 148                 freqout = 1;
 149         else
 150                 freqout = 2;
 151
 152         /*
 153          * Write to phy address 0 to configure the clock
 154          * use HFBITCLK write HDMI_TXPHY_TX_CONTROL_FREQOUT field
 155          */
 156         REG_FLD_MOD(phy->base, HDMI_TXPHY_TX_CTRL, freqout, 31, 30);
 157
 158         /* Write to phy address 1 to start HDMI line (TXVALID and TMDSCLKEN) */
 159         hdmi_write_reg(phy->base, HDMI_TXPHY_DIGITAL_CTRL, 0xF0000000);
 160
 161         /* Setup max LDO voltage */
 162         if (phy->features->ldo_voltage)
 163                 REG_FLD_MOD(phy->base, HDMI_TXPHY_POWER_CTRL, 0xB, 3, 0);
 164
 165         hdmi_phy_configure_lanes(phy);
 166
 167         return 0;
 168 }
 169
 170 static const struct hdmi_phy_features omap44xx_phy_feats = {
 171         .bist_ctrl      =       false,
 172         .ldo_voltage    =       true,
 173         .max_phy        =       185675000,
 174 };
 175
 176 static const struct hdmi_phy_features omap54xx_phy_feats = {
 177         .bist_ctrl      =       true,
 178         .ldo_voltage    =       false,
 179         .max_phy        =       186000000,
 180 };
 181
 182 int hdmi_phy_init(struct platform_device *pdev, struct hdmi_phy_data *phy,
 183                   unsigned int version)
 184 {
 185         struct resource *res;
 186
 187         if (version == 4)
 188                 phy->features = &omap44xx_phy_feats;
 189         else
 190                 phy->features = &omap54xx_phy_feats;
 191
 192         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy");
 193         phy->base = devm_ioremap_resource(&pdev->dev, res);
 194         if (IS_ERR(phy->base))
 195                 return PTR_ERR(phy->base);
 196
 197         return 0;
 198 }