drivers/video/fbdev/omap2/omapfb/dss/hdmi_phy.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HDMI PHY
   4  *
   5  * Copyright (C) 2013 Texas Instruments Incorporated
   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 <video/omapfb_dss.h>
  16
  17 #include "dss.h"
  18 #include "hdmi.h"
  19
  20 struct hdmi_phy_features {
  21         bool bist_ctrl;
  22         bool ldo_voltage;
  23         unsigned long max_phy;
  24 };
  25
  26 static const struct hdmi_phy_features *phy_feat;
  27
  28 void hdmi_phy_dump(struct hdmi_phy_data *phy, struct seq_file *s)
  29 {
  30 #define DUMPPHY(r) seq_printf(s, "%-35s %08x\n", #r,\
  31                 hdmi_read_reg(phy->base, r))
  32
  33         DUMPPHY(HDMI_TXPHY_TX_CTRL);
  34         DUMPPHY(HDMI_TXPHY_DIGITAL_CTRL);
  35         DUMPPHY(HDMI_TXPHY_POWER_CTRL);
  36         DUMPPHY(HDMI_TXPHY_PAD_CFG_CTRL);
  37         if (phy_feat->bist_ctrl)
  38                 DUMPPHY(HDMI_TXPHY_BIST_CONTROL);
  39 }
  40
  41 int hdmi_phy_parse_lanes(struct hdmi_phy_data *phy, const u32 *lanes)
  42 {
  43         int i;
  44
  45         for (i = 0; i < 8; i += 2) {
  46                 u8 lane, pol;
  47                 int dx, dy;
  48
  49                 dx = lanes[i];
  50                 dy = lanes[i + 1];
  51
  52                 if (dx < 0 || dx >= 8)
  53                         return -EINVAL;
  54
  55                 if (dy < 0 || dy >= 8)
  56                         return -EINVAL;
  57
  58                 if (dx & 1) {
  59                         if (dy != dx - 1)
  60                                 return -EINVAL;
  61                         pol = 1;
  62                 } else {
  63                         if (dy != dx + 1)
  64                                 return -EINVAL;
  65                         pol = 0;
  66                 }
  67
  68                 lane = dx / 2;
  69
  70                 phy->lane_function[lane] = i / 2;
  71                 phy->lane_polarity[lane] = pol;
  72         }
  73
  74         return 0;
  75 }
  76
  77 static void hdmi_phy_configure_lanes(struct hdmi_phy_data *phy)
  78 {
  79         static const u16 pad_cfg_list[] = {
  80                 0x0123,
  81                 0x0132,
  82                 0x0312,
  83                 0x0321,
  84                 0x0231,
  85                 0x0213,
  86                 0x1023,
  87                 0x1032,
  88                 0x3012,
  89                 0x3021,
  90                 0x2031,
  91                 0x2013,
  92                 0x1203,
  93                 0x1302,
  94                 0x3102,
  95                 0x3201,
  96                 0x2301,
  97                 0x2103,
  98                 0x1230,
  99                 0x1320,
 100                 0x3120,
 101                 0x3210,
 102                 0x2310,
 103                 0x2130,
 104         };
 105
 106         u16 lane_cfg = 0;
 107         int i;
 108         unsigned lane_cfg_val;
 109         u16 pol_val = 0;
 110
 111         for (i = 0; i < 4; ++i)
 112                 lane_cfg |= phy->lane_function[i] << ((3 - i) * 4);
 113
 114         pol_val |= phy->lane_polarity[0] << 0;
 115         pol_val |= phy->lane_polarity[1] << 3;
 116         pol_val |= phy->lane_polarity[2] << 2;
 117         pol_val |= phy->lane_polarity[3] << 1;
 118
 119         for (i = 0; i < ARRAY_SIZE(pad_cfg_list); ++i)
 120                 if (pad_cfg_list[i] == lane_cfg)
 121                         break;
 122
 123         if (WARN_ON(i == ARRAY_SIZE(pad_cfg_list)))
 124                 i = 0;
 125
 126         lane_cfg_val = i;
 127
 128         REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, lane_cfg_val, 26, 22);
 129         REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, pol_val, 30, 27);
 130 }
 131
 132 int hdmi_phy_configure(struct hdmi_phy_data *phy, unsigned long hfbitclk,
 133         unsigned long lfbitclk)
 134 {
 135         u8 freqout;
 136
 137         /*
 138          * Read address 0 in order to get the SCP reset done completed
 139          * Dummy access performed to make sure reset is done
 140          */
 141         hdmi_read_reg(phy->base, HDMI_TXPHY_TX_CTRL);
 142
 143         /*
 144          * In OMAP5+, the HFBITCLK must be divided by 2 before issuing the
 145          * HDMI_PHYPWRCMD_LDOON command.
 146          */
 147         if (phy_feat->bist_ctrl)
 148                 REG_FLD_MOD(phy->base, HDMI_TXPHY_BIST_CONTROL, 1, 11, 11);
 149
 150         /*
 151          * If the hfbitclk != lfbitclk, it means the lfbitclk was configured
 152          * to be used for TMDS.
 153          */
 154         if (hfbitclk != lfbitclk)
 155                 freqout = 0;
 156         else if (hfbitclk / 10 < phy_feat->max_phy)
 157                 freqout = 1;
 158         else
 159                 freqout = 2;
 160
 161         /*
 162          * Write to phy address 0 to configure the clock
 163          * use HFBITCLK write HDMI_TXPHY_TX_CONTROL_FREQOUT field
 164          */
 165         REG_FLD_MOD(phy->base, HDMI_TXPHY_TX_CTRL, freqout, 31, 30);
 166
 167         /* Write to phy address 1 to start HDMI line (TXVALID and TMDSCLKEN) */
 168         hdmi_write_reg(phy->base, HDMI_TXPHY_DIGITAL_CTRL, 0xF0000000);
 169
 170         /* Setup max LDO voltage */
 171         if (phy_feat->ldo_voltage)
 172                 REG_FLD_MOD(phy->base, HDMI_TXPHY_POWER_CTRL, 0xB, 3, 0);
 173
 174         hdmi_phy_configure_lanes(phy);
 175
 176         return 0;
 177 }
 178
 179 static const struct hdmi_phy_features omap44xx_phy_feats = {
 180         .bist_ctrl      =       false,
 181         .ldo_voltage    =       true,
 182         .max_phy        =       185675000,
 183 };
 184
 185 static const struct hdmi_phy_features omap54xx_phy_feats = {
 186         .bist_ctrl      =       true,
 187         .ldo_voltage    =       false,
 188         .max_phy        =       186000000,
 189 };
 190
 191 static const struct hdmi_phy_features *hdmi_phy_get_features(void)
 192 {
 193         switch (omapdss_get_version()) {
 194         case OMAPDSS_VER_OMAP4430_ES1:
 195         case OMAPDSS_VER_OMAP4430_ES2:
 196         case OMAPDSS_VER_OMAP4:
 197                 return &omap44xx_phy_feats;
 198
 199         case OMAPDSS_VER_OMAP5:
 200         case OMAPDSS_VER_DRA7xx:
 201                 return &omap54xx_phy_feats;
 202
 203         default:
 204                 return NULL;
 205         }
 206 }
 207
 208 int hdmi_phy_init(struct platform_device *pdev, struct hdmi_phy_data *phy)
 209 {
 210         phy_feat = hdmi_phy_get_features();
 211         if (!phy_feat)
 212                 return -ENODEV;
 213
 214         phy->base = devm_platform_ioremap_resource_byname(pdev, "phy");
 215         if (IS_ERR(phy->base)) {
 216                 DSSERR("can't ioremap TX PHY\n");
 217                 return PTR_ERR(phy->base);
 218         }
 219
 220         return 0;
 221 }