drivers/gpu/drm/omapdrm/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 #include <video/omapdss.h>
  18
  19 #include "dss.h"
  20 #include "hdmi.h"
  21
  22 struct hdmi_phy_features {
  23         bool bist_ctrl;
  24         bool ldo_voltage;
  25         unsigned long max_phy;
  26 };
  27
  28 static const struct hdmi_phy_features *phy_feat;
  29
  30 void hdmi_phy_dump(struct hdmi_phy_data *phy, struct seq_file *s)
  31 {
  32 #define DUMPPHY(r) seq_printf(s, "%-35s %08x\n", #r,\
  33                 hdmi_read_reg(phy->base, r))
  34
  35         DUMPPHY(HDMI_TXPHY_TX_CTRL);
  36         DUMPPHY(HDMI_TXPHY_DIGITAL_CTRL);
  37         DUMPPHY(HDMI_TXPHY_POWER_CTRL);
  38         DUMPPHY(HDMI_TXPHY_PAD_CFG_CTRL);
  39         if (phy_feat->bist_ctrl)
  40                 DUMPPHY(HDMI_TXPHY_BIST_CONTROL);
  41 }
  42
  43 int hdmi_phy_parse_lanes(struct hdmi_phy_data *phy, const u32 *lanes)
  44 {
  45         int i;
  46
  47         for (i = 0; i < 8; i += 2) {
  48                 u8 lane, pol;
  49                 int dx, dy;
  50
  51                 dx = lanes[i];
  52                 dy = lanes[i + 1];
  53
  54                 if (dx < 0 || dx >= 8)
  55                         return -EINVAL;
  56
  57                 if (dy < 0 || dy >= 8)
  58                         return -EINVAL;
  59
  60                 if (dx & 1) {
  61                         if (dy != dx - 1)
  62                                 return -EINVAL;
  63                         pol = 1;
  64                 } else {
  65                         if (dy != dx + 1)
  66                                 return -EINVAL;
  67                         pol = 0;
  68                 }
  69
  70                 lane = dx / 2;
  71
  72                 phy->lane_function[lane] = i / 2;
  73                 phy->lane_polarity[lane] = pol;
  74         }
  75
  76         return 0;
  77 }
  78
  79 static void hdmi_phy_configure_lanes(struct hdmi_phy_data *phy)
  80 {
  81         static const u16 pad_cfg_list[] = {
  82                 0x0123,
  83                 0x0132,
  84                 0x0312,
  85                 0x0321,
  86                 0x0231,
  87                 0x0213,
  88                 0x1023,
  89                 0x1032,
  90                 0x3012,
  91                 0x3021,
  92                 0x2031,
  93                 0x2013,
  94                 0x1203,
  95                 0x1302,
  96                 0x3102,
  97                 0x3201,
  98                 0x2301,
  99                 0x2103,
 100                 0x1230,
 101                 0x1320,
 102                 0x3120,
 103                 0x3210,
 104                 0x2310,
 105                 0x2130,
 106         };
 107
 108         u16 lane_cfg = 0;
 109         int i;
 110         unsigned lane_cfg_val;
 111         u16 pol_val = 0;
 112
 113         for (i = 0; i < 4; ++i)
 114                 lane_cfg |= phy->lane_function[i] << ((3 - i) * 4);
 115
 116         pol_val |= phy->lane_polarity[0] << 0;
 117         pol_val |= phy->lane_polarity[1] << 3;
 118         pol_val |= phy->lane_polarity[2] << 2;
 119         pol_val |= phy->lane_polarity[3] << 1;
 120
 121         for (i = 0; i < ARRAY_SIZE(pad_cfg_list); ++i)
 122                 if (pad_cfg_list[i] == lane_cfg)
 123                         break;
 124
 125         if (WARN_ON(i == ARRAY_SIZE(pad_cfg_list)))
 126                 i = 0;
 127
 128         lane_cfg_val = i;
 129
 130         REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, lane_cfg_val, 26, 22);
 131         REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, pol_val, 30, 27);
 132 }
 133
 134 int hdmi_phy_configure(struct hdmi_phy_data *phy, unsigned long hfbitclk,
 135         unsigned long lfbitclk)
 136 {
 137         u8 freqout;
 138
 139         /*
 140          * Read address 0 in order to get the SCP reset done completed
 141          * Dummy access performed to make sure reset is done
 142          */
 143         hdmi_read_reg(phy->base, HDMI_TXPHY_TX_CTRL);
 144
 145         /*
 146          * In OMAP5+, the HFBITCLK must be divided by 2 before issuing the
 147          * HDMI_PHYPWRCMD_LDOON command.
 148         */
 149         if (phy_feat->bist_ctrl)
 150                 REG_FLD_MOD(phy->base, HDMI_TXPHY_BIST_CONTROL, 1, 11, 11);
 151
 152         /*
 153          * If the hfbitclk != lfbitclk, it means the lfbitclk was configured
 154          * to be used for TMDS.
 155          */
 156         if (hfbitclk != lfbitclk)
 157                 freqout = 0;
 158         else if (hfbitclk / 10 < phy_feat->max_phy)
 159                 freqout = 1;
 160         else
 161                 freqout = 2;
 162
 163         /*
 164          * Write to phy address 0 to configure the clock
 165          * use HFBITCLK write HDMI_TXPHY_TX_CONTROL_FREQOUT field
 166          */
 167         REG_FLD_MOD(phy->base, HDMI_TXPHY_TX_CTRL, freqout, 31, 30);
 168
 169         /* Write to phy address 1 to start HDMI line (TXVALID and TMDSCLKEN) */
 170         hdmi_write_reg(phy->base, HDMI_TXPHY_DIGITAL_CTRL, 0xF0000000);
 171
 172         /* Setup max LDO voltage */
 173         if (phy_feat->ldo_voltage)
 174                 REG_FLD_MOD(phy->base, HDMI_TXPHY_POWER_CTRL, 0xB, 3, 0);
 175
 176         hdmi_phy_configure_lanes(phy);
 177
 178         return 0;
 179 }
 180
 181 static const struct hdmi_phy_features omap44xx_phy_feats = {
 182         .bist_ctrl      =       false,
 183         .ldo_voltage    =       true,
 184         .max_phy        =       185675000,
 185 };
 186
 187 static const struct hdmi_phy_features omap54xx_phy_feats = {
 188         .bist_ctrl      =       true,
 189         .ldo_voltage    =       false,
 190         .max_phy        =       186000000,
 191 };
 192
 193 static int hdmi_phy_init_features(struct platform_device *pdev)
 194 {
 195         struct hdmi_phy_features *dst;
 196         const struct hdmi_phy_features *src;
 197
 198         dst = devm_kzalloc(&pdev->dev, sizeof(*dst), GFP_KERNEL);
 199         if (!dst) {
 200                 dev_err(&pdev->dev, "Failed to allocate HDMI PHY Features\n");
 201                 return -ENOMEM;
 202         }
 203
 204         switch (omapdss_get_version()) {
 205         case OMAPDSS_VER_OMAP4430_ES1:
 206         case OMAPDSS_VER_OMAP4430_ES2:
 207         case OMAPDSS_VER_OMAP4:
 208                 src = &omap44xx_phy_feats;
 209                 break;
 210
 211         case OMAPDSS_VER_OMAP5:
 212         case OMAPDSS_VER_DRA7xx:
 213                 src = &omap54xx_phy_feats;
 214                 break;
 215
 216         default:
 217                 return -ENODEV;
 218         }
 219
 220         memcpy(dst, src, sizeof(*dst));
 221         phy_feat = dst;
 222
 223         return 0;
 224 }
 225
 226 int hdmi_phy_init(struct platform_device *pdev, struct hdmi_phy_data *phy)
 227 {
 228         int r;
 229         struct resource *res;
 230
 231         r = hdmi_phy_init_features(pdev);
 232         if (r)
 233                 return r;
 234
 235         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy");
 236         if (!res) {
 237                 DSSERR("can't get PHY mem resource\n");
 238                 return -EINVAL;
 239         }
 240
 241         phy->base = devm_ioremap_resource(&pdev->dev, res);
 242         if (IS_ERR(phy->base)) {
 243                 DSSERR("can't ioremap TX PHY\n");
 244                 return PTR_ERR(phy->base);
 245         }
 246
 247         return 0;
 248 }