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

   1 /*
   2  * HDMI PHY
   3  *
   4  * Copyright (C) 2013 Texas Instruments Incorporated
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published by
   8  * the Free Software Foundation.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/err.h>
  13 #include <linux/io.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/slab.h>
  16 #include <linux/seq_file.h>
  17
  18 #include <video/omapfb_dss.h>
  19
  20 #include "dss.h"
  21 #include "hdmi.h"
  22
  23 struct hdmi_phy_features {
  24         bool bist_ctrl;
  25         bool ldo_voltage;
  26         unsigned long max_phy;
  27 };
  28
  29 static const struct hdmi_phy_features *phy_feat;
  30
  31 void hdmi_phy_dump(struct hdmi_phy_data *phy, struct seq_file *s)
  32 {
  33 #define DUMPPHY(r) seq_printf(s, "%-35s %08x\n", #r,\
  34                 hdmi_read_reg(phy->base, r))
  35
  36         DUMPPHY(HDMI_TXPHY_TX_CTRL);
  37         DUMPPHY(HDMI_TXPHY_DIGITAL_CTRL);
  38         DUMPPHY(HDMI_TXPHY_POWER_CTRL);
  39         DUMPPHY(HDMI_TXPHY_PAD_CFG_CTRL);
  40         if (phy_feat->bist_ctrl)
  41                 DUMPPHY(HDMI_TXPHY_BIST_CONTROL);
  42 }
  43
  44 int hdmi_phy_parse_lanes(struct hdmi_phy_data *phy, const u32 *lanes)
  45 {
  46         int i;
  47
  48         for (i = 0; i < 8; i += 2) {
  49                 u8 lane, pol;
  50                 int dx, dy;
  51
  52                 dx = lanes[i];
  53                 dy = lanes[i + 1];
  54
  55                 if (dx < 0 || dx >= 8)
  56                         return -EINVAL;
  57
  58                 if (dy < 0 || dy >= 8)
  59                         return -EINVAL;
  60
  61                 if (dx & 1) {
  62                         if (dy != dx - 1)
  63                                 return -EINVAL;
  64                         pol = 1;
  65                 } else {
  66                         if (dy != dx + 1)
  67                                 return -EINVAL;
  68                         pol = 0;
  69                 }
  70
  71                 lane = dx / 2;
  72
  73                 phy->lane_function[lane] = i / 2;
  74                 phy->lane_polarity[lane] = pol;
  75         }
  76
  77         return 0;
  78 }
  79
  80 static void hdmi_phy_configure_lanes(struct hdmi_phy_data *phy)
  81 {
  82         static const u16 pad_cfg_list[] = {
  83                 0x0123,
  84                 0x0132,
  85                 0x0312,
  86                 0x0321,
  87                 0x0231,
  88                 0x0213,
  89                 0x1023,
  90                 0x1032,
  91                 0x3012,
  92                 0x3021,
  93                 0x2031,
  94                 0x2013,
  95                 0x1203,
  96                 0x1302,
  97                 0x3102,
  98                 0x3201,
  99                 0x2301,
 100                 0x2103,
 101                 0x1230,
 102                 0x1320,
 103                 0x3120,
 104                 0x3210,
 105                 0x2310,
 106                 0x2130,
 107         };
 108
 109         u16 lane_cfg = 0;
 110         int i;
 111         unsigned lane_cfg_val;
 112         u16 pol_val = 0;
 113
 114         for (i = 0; i < 4; ++i)
 115                 lane_cfg |= phy->lane_function[i] << ((3 - i) * 4);
 116
 117         pol_val |= phy->lane_polarity[0] << 0;
 118         pol_val |= phy->lane_polarity[1] << 3;
 119         pol_val |= phy->lane_polarity[2] << 2;
 120         pol_val |= phy->lane_polarity[3] << 1;
 121
 122         for (i = 0; i < ARRAY_SIZE(pad_cfg_list); ++i)
 123                 if (pad_cfg_list[i] == lane_cfg)
 124                         break;
 125
 126         if (WARN_ON(i == ARRAY_SIZE(pad_cfg_list)))
 127                 i = 0;
 128
 129         lane_cfg_val = i;
 130
 131         REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, lane_cfg_val, 26, 22);
 132         REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, pol_val, 30, 27);
 133 }
 134
 135 int hdmi_phy_configure(struct hdmi_phy_data *phy, unsigned long hfbitclk,
 136         unsigned long lfbitclk)
 137 {
 138         u8 freqout;
 139
 140         /*
 141          * Read address 0 in order to get the SCP reset done completed
 142          * Dummy access performed to make sure reset is done
 143          */
 144         hdmi_read_reg(phy->base, HDMI_TXPHY_TX_CTRL);
 145
 146         /*
 147          * In OMAP5+, the HFBITCLK must be divided by 2 before issuing the
 148          * HDMI_PHYPWRCMD_LDOON command.
 149         */
 150         if (phy_feat->bist_ctrl)
 151                 REG_FLD_MOD(phy->base, HDMI_TXPHY_BIST_CONTROL, 1, 11, 11);
 152
 153         /*
 154          * If the hfbitclk != lfbitclk, it means the lfbitclk was configured
 155          * to be used for TMDS.
 156          */
 157         if (hfbitclk != lfbitclk)
 158                 freqout = 0;
 159         else if (hfbitclk / 10 < phy_feat->max_phy)
 160                 freqout = 1;
 161         else
 162                 freqout = 2;
 163
 164         /*
 165          * Write to phy address 0 to configure the clock
 166          * use HFBITCLK write HDMI_TXPHY_TX_CONTROL_FREQOUT field
 167          */
 168         REG_FLD_MOD(phy->base, HDMI_TXPHY_TX_CTRL, freqout, 31, 30);
 169
 170         /* Write to phy address 1 to start HDMI line (TXVALID and TMDSCLKEN) */
 171         hdmi_write_reg(phy->base, HDMI_TXPHY_DIGITAL_CTRL, 0xF0000000);
 172
 173         /* Setup max LDO voltage */
 174         if (phy_feat->ldo_voltage)
 175                 REG_FLD_MOD(phy->base, HDMI_TXPHY_POWER_CTRL, 0xB, 3, 0);
 176
 177         hdmi_phy_configure_lanes(phy);
 178
 179         return 0;
 180 }
 181
 182 static const struct hdmi_phy_features omap44xx_phy_feats = {
 183         .bist_ctrl      =       false,
 184         .ldo_voltage    =       true,
 185         .max_phy        =       185675000,
 186 };
 187
 188 static const struct hdmi_phy_features omap54xx_phy_feats = {
 189         .bist_ctrl      =       true,
 190         .ldo_voltage    =       false,
 191         .max_phy        =       186000000,
 192 };
 193
 194 static const struct hdmi_phy_features *hdmi_phy_get_features(void)
 195 {
 196         switch (omapdss_get_version()) {
 197         case OMAPDSS_VER_OMAP4430_ES1:
 198         case OMAPDSS_VER_OMAP4430_ES2:
 199         case OMAPDSS_VER_OMAP4:
 200                 return &omap44xx_phy_feats;
 201
 202         case OMAPDSS_VER_OMAP5:
 203         case OMAPDSS_VER_DRA7xx:
 204                 return &omap54xx_phy_feats;
 205
 206         default:
 207                 return NULL;
 208         }
 209 }
 210
 211 int hdmi_phy_init(struct platform_device *pdev, struct hdmi_phy_data *phy)
 212 {
 213         struct resource *res;
 214
 215         phy_feat = hdmi_phy_get_features();
 216         if (!phy_feat)
 217                 return -ENODEV;
 218
 219         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy");
 220         if (!res) {
 221                 DSSERR("can't get PHY mem resource\n");
 222                 return -EINVAL;
 223         }
 224
 225         phy->base = devm_ioremap_resource(&pdev->dev, res);
 226         if (IS_ERR(phy->base)) {
 227                 DSSERR("can't ioremap TX PHY\n");
 228                 return PTR_ERR(phy->base);
 229         }
 230
 231         return 0;
 232 }