drivers/video/sunxi/sunxi_dw_hdmi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Allwinner DW HDMI bridge
   4  *
   5  * (C) Copyright 2017 Jernej Skrabec <jernej.skrabec@siol.net>
   6  */
   7
   8 #include <common.h>
   9 #include <display.h>
  10 #include <dm.h>
  11 #include <dw_hdmi.h>
  12 #include <edid.h>
  13 #include <asm/io.h>
  14 #include <asm/arch/clock.h>
  15 #include <asm/arch/lcdc.h>
  16
  17 struct sunxi_dw_hdmi_priv {
  18         struct dw_hdmi hdmi;
  19         int mux;
  20 };
  21
  22 struct sunxi_hdmi_phy {
  23         u32 pol;
  24         u32 res1[3];
  25         u32 read_en;
  26         u32 unscramble;
  27         u32 res2[2];
  28         u32 ctrl;
  29         u32 unk1;
  30         u32 unk2;
  31         u32 pll;
  32         u32 clk;
  33         u32 unk3;
  34         u32 status;
  35 };
  36
  37 #define HDMI_PHY_OFFS 0x10000
  38
  39 static int sunxi_dw_hdmi_get_divider(uint clock)
  40 {
  41         /*
  42          * Due to missing documentaion of HDMI PHY, we know correct
  43          * settings only for following four PHY dividers. Select one
  44          * based on clock speed.
  45          */
  46         if (clock <= 27000000)
  47                 return 11;
  48         else if (clock <= 74250000)
  49                 return 4;
  50         else if (clock <= 148500000)
  51                 return 2;
  52         else
  53                 return 1;
  54 }
  55
  56 static void sunxi_dw_hdmi_phy_init(void)
  57 {
  58         struct sunxi_hdmi_phy * const phy =
  59                 (struct sunxi_hdmi_phy *)(SUNXI_HDMI_BASE + HDMI_PHY_OFFS);
  60         unsigned long tmo;
  61         u32 tmp;
  62
  63         /*
  64          * HDMI PHY settings are taken as-is from Allwinner BSP code.
  65          * There is no documentation.
  66          */
  67         writel(0, &phy->ctrl);
  68         setbits_le32(&phy->ctrl, BIT(0));
  69         udelay(5);
  70         setbits_le32(&phy->ctrl, BIT(16));
  71         setbits_le32(&phy->ctrl, BIT(1));
  72         udelay(10);
  73         setbits_le32(&phy->ctrl, BIT(2));
  74         udelay(5);
  75         setbits_le32(&phy->ctrl, BIT(3));
  76         udelay(40);
  77         setbits_le32(&phy->ctrl, BIT(19));
  78         udelay(100);
  79         setbits_le32(&phy->ctrl, BIT(18));
  80         setbits_le32(&phy->ctrl, 7 << 4);
  81
  82         /* Note that Allwinner code doesn't fail in case of timeout */
  83         tmo = timer_get_us() + 2000;
  84         while ((readl(&phy->status) & 0x80) == 0) {
  85                 if (timer_get_us() > tmo) {
  86                         printf("Warning: HDMI PHY init timeout!\n");
  87                         break;
  88                 }
  89         }
  90
  91         setbits_le32(&phy->ctrl, 0xf << 8);
  92         setbits_le32(&phy->ctrl, BIT(7));
  93
  94         writel(0x39dc5040, &phy->pll);
  95         writel(0x80084343, &phy->clk);
  96         udelay(10000);
  97         writel(1, &phy->unk3);
  98         setbits_le32(&phy->pll, BIT(25));
  99         udelay(100000);
 100         tmp = (readl(&phy->status) & 0x1f800) >> 11;
 101         setbits_le32(&phy->pll, BIT(31) | BIT(30));
 102         setbits_le32(&phy->pll, tmp);
 103         writel(0x01FF0F7F, &phy->ctrl);
 104         writel(0x80639000, &phy->unk1);
 105         writel(0x0F81C405, &phy->unk2);
 106
 107         /* enable read access to HDMI controller */
 108         writel(0x54524545, &phy->read_en);
 109         /* descramble register offsets */
 110         writel(0x42494E47, &phy->unscramble);
 111 }
 112
 113 static int sunxi_dw_hdmi_get_plug_in_status(void)
 114 {
 115         struct sunxi_hdmi_phy * const phy =
 116                 (struct sunxi_hdmi_phy *)(SUNXI_HDMI_BASE + HDMI_PHY_OFFS);
 117
 118         return !!(readl(&phy->status) & (1 << 19));
 119 }
 120
 121 static int sunxi_dw_hdmi_wait_for_hpd(void)
 122 {
 123         ulong start;
 124
 125         start = get_timer(0);
 126         do {
 127                 if (sunxi_dw_hdmi_get_plug_in_status())
 128                         return 0;
 129                 udelay(100);
 130         } while (get_timer(start) < 300);
 131
 132         return -1;
 133 }
 134
 135 static void sunxi_dw_hdmi_phy_set(uint clock, int phy_div)
 136 {
 137         struct sunxi_hdmi_phy * const phy =
 138                 (struct sunxi_hdmi_phy *)(SUNXI_HDMI_BASE + HDMI_PHY_OFFS);
 139         int div = sunxi_dw_hdmi_get_divider(clock);
 140         u32 tmp;
 141
 142         /*
 143          * Unfortunately, we don't know much about those magic
 144          * numbers. They are taken from Allwinner BSP driver.
 145          */
 146         switch (div) {
 147         case 1:
 148                 writel(0x30dc5fc0, &phy->pll);
 149                 writel(0x800863C0 | (phy_div - 1), &phy->clk);
 150                 mdelay(10);
 151                 writel(0x00000001, &phy->unk3);
 152                 setbits_le32(&phy->pll, BIT(25));
 153                 mdelay(200);
 154                 tmp = (readl(&phy->status) & 0x1f800) >> 11;
 155                 setbits_le32(&phy->pll, BIT(31) | BIT(30));
 156                 if (tmp < 0x3d)
 157                         setbits_le32(&phy->pll, tmp + 2);
 158                 else
 159                         setbits_le32(&phy->pll, 0x3f);
 160                 mdelay(100);
 161                 writel(0x01FFFF7F, &phy->ctrl);
 162                 writel(0x8063b000, &phy->unk1);
 163                 writel(0x0F8246B5, &phy->unk2);
 164                 break;
 165         case 2:
 166                 writel(0x39dc5040, &phy->pll);
 167                 writel(0x80084380 | (phy_div - 1), &phy->clk);
 168                 mdelay(10);
 169                 writel(0x00000001, &phy->unk3);
 170                 setbits_le32(&phy->pll, BIT(25));
 171                 mdelay(100);
 172                 tmp = (readl(&phy->status) & 0x1f800) >> 11;
 173                 setbits_le32(&phy->pll, BIT(31) | BIT(30));
 174                 setbits_le32(&phy->pll, tmp);
 175                 writel(0x01FFFF7F, &phy->ctrl);
 176                 writel(0x8063a800, &phy->unk1);
 177                 writel(0x0F81C485, &phy->unk2);
 178                 break;
 179         case 4:
 180                 writel(0x39dc5040, &phy->pll);
 181                 writel(0x80084340 | (phy_div - 1), &phy->clk);
 182                 mdelay(10);
 183                 writel(0x00000001, &phy->unk3);
 184                 setbits_le32(&phy->pll, BIT(25));
 185                 mdelay(100);
 186                 tmp = (readl(&phy->status) & 0x1f800) >> 11;
 187                 setbits_le32(&phy->pll, BIT(31) | BIT(30));
 188                 setbits_le32(&phy->pll, tmp);
 189                 writel(0x01FFFF7F, &phy->ctrl);
 190                 writel(0x8063b000, &phy->unk1);
 191                 writel(0x0F81C405, &phy->unk2);
 192                 break;
 193         case 11:
 194                 writel(0x39dc5040, &phy->pll);
 195                 writel(0x80084300 | (phy_div - 1), &phy->clk);
 196                 mdelay(10);
 197                 writel(0x00000001, &phy->unk3);
 198                 setbits_le32(&phy->pll, BIT(25));
 199                 mdelay(100);
 200                 tmp = (readl(&phy->status) & 0x1f800) >> 11;
 201                 setbits_le32(&phy->pll, BIT(31) | BIT(30));
 202                 setbits_le32(&phy->pll, tmp);
 203                 writel(0x01FFFF7F, &phy->ctrl);
 204                 writel(0x8063b000, &phy->unk1);
 205                 writel(0x0F81C405, &phy->unk2);
 206                 break;
 207         }
 208 }
 209
 210 static void sunxi_dw_hdmi_pll_set(uint clk_khz, int *phy_div)
 211 {
 212         int value, n, m, div, diff;
 213         int best_n = 0, best_m = 0, best_div = 0, best_diff = 0x0FFFFFFF;
 214
 215         /*
 216          * Find the lowest divider resulting in a matching clock. If there
 217          * is no match, pick the closest lower clock, as monitors tend to
 218          * not sync to higher frequencies.
 219          */
 220         for (div = 1; div <= 16; div++) {
 221                 int target = clk_khz * div;
 222
 223                 if (target < 192000)
 224                         continue;
 225                 if (target > 912000)
 226                         continue;
 227
 228                 for (m = 1; m <= 16; m++) {
 229                         n = (m * target) / 24000;
 230
 231                         if (n >= 1 && n <= 128) {
 232                                 value = (24000 * n) / m / div;
 233                                 diff = clk_khz - value;
 234                                 if (diff < best_diff) {
 235                                         best_diff = diff;
 236                                         best_m = m;
 237                                         best_n = n;
 238                                         best_div = div;
 239                                 }
 240                         }
 241                 }
 242         }
 243
 244         *phy_div = best_div;
 245
 246         clock_set_pll3_factors(best_m, best_n);
 247         debug("dotclock: %dkHz = %dkHz: (24MHz * %d) / %d / %d\n",
 248               clk_khz, (clock_get_pll3() / 1000) / best_div,
 249               best_n, best_m, best_div);
 250 }
 251
 252 static void sunxi_dw_hdmi_lcdc_init(int mux, const struct display_timing *edid,
 253                                     int bpp)
 254 {
 255         struct sunxi_ccm_reg * const ccm =
 256                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 257         int div = clock_get_pll3() / edid->pixelclock.typ;
 258         struct sunxi_lcdc_reg *lcdc;
 259
 260         if (mux == 0) {
 261                 lcdc = (struct sunxi_lcdc_reg *)SUNXI_LCD0_BASE;
 262
 263                 /* Reset off */
 264                 setbits_le32(&ccm->ahb_reset1_cfg, 1 << AHB_RESET_OFFSET_LCD0);
 265
 266                 /* Clock on */
 267                 setbits_le32(&ccm->ahb_gate1, 1 << AHB_GATE_OFFSET_LCD0);
 268                 writel(CCM_LCD0_CTRL_GATE | CCM_LCD0_CTRL_M(div),
 269                        &ccm->lcd0_clk_cfg);
 270         } else {
 271                 lcdc = (struct sunxi_lcdc_reg *)SUNXI_LCD1_BASE;
 272
 273                 /* Reset off */
 274                 setbits_le32(&ccm->ahb_reset1_cfg, 1 << AHB_RESET_OFFSET_LCD1);
 275
 276                 /* Clock on */
 277                 setbits_le32(&ccm->ahb_gate1, 1 << AHB_GATE_OFFSET_LCD1);
 278                 writel(CCM_LCD1_CTRL_GATE | CCM_LCD1_CTRL_M(div),
 279                        &ccm->lcd1_clk_cfg);
 280         }
 281
 282         lcdc_init(lcdc);
 283         lcdc_tcon1_mode_set(lcdc, edid, false, false);
 284         lcdc_enable(lcdc, bpp);
 285 }
 286
 287 static int sunxi_dw_hdmi_phy_cfg(struct dw_hdmi *hdmi, uint mpixelclock)
 288 {
 289         int phy_div;
 290
 291         sunxi_dw_hdmi_pll_set(mpixelclock / 1000, &phy_div);
 292         sunxi_dw_hdmi_phy_set(mpixelclock, phy_div);
 293
 294         return 0;
 295 }
 296
 297 static int sunxi_dw_hdmi_read_edid(struct udevice *dev, u8 *buf, int buf_size)
 298 {
 299         struct sunxi_dw_hdmi_priv *priv = dev_get_priv(dev);
 300
 301         return dw_hdmi_read_edid(&priv->hdmi, buf, buf_size);
 302 }
 303
 304 static int sunxi_dw_hdmi_enable(struct udevice *dev, int panel_bpp,
 305                                 const struct display_timing *edid)
 306 {
 307         struct sunxi_hdmi_phy * const phy =
 308                 (struct sunxi_hdmi_phy *)(SUNXI_HDMI_BASE + HDMI_PHY_OFFS);
 309         struct sunxi_dw_hdmi_priv *priv = dev_get_priv(dev);
 310         int ret;
 311
 312         ret = dw_hdmi_enable(&priv->hdmi, edid);
 313         if (ret)
 314                 return ret;
 315
 316         sunxi_dw_hdmi_lcdc_init(priv->mux, edid, panel_bpp);
 317
 318         if (edid->flags & DISPLAY_FLAGS_VSYNC_LOW)
 319                 setbits_le32(&phy->pol, 0x200);
 320
 321         if (edid->flags & DISPLAY_FLAGS_HSYNC_LOW)
 322                 setbits_le32(&phy->pol, 0x100);
 323
 324         setbits_le32(&phy->ctrl, 0xf << 12);
 325
 326         /*
 327          * This is last hdmi access before boot, so scramble addresses
 328          * again or othwerwise BSP driver won't work. Dummy read is
 329          * needed or otherwise last write doesn't get written correctly.
 330          */
 331         (void)readb(SUNXI_HDMI_BASE);
 332         writel(0, &phy->unscramble);
 333
 334         return 0;
 335 }
 336
 337 static int sunxi_dw_hdmi_probe(struct udevice *dev)
 338 {
 339         struct display_plat *uc_plat = dev_get_uclass_platdata(dev);
 340         struct sunxi_dw_hdmi_priv *priv = dev_get_priv(dev);
 341         struct sunxi_ccm_reg * const ccm =
 342                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 343         int ret;
 344
 345         /* Set pll3 to 297 MHz */
 346         clock_set_pll3(297000000);
 347
 348         /* Set hdmi parent to pll3 */
 349         clrsetbits_le32(&ccm->hdmi_clk_cfg, CCM_HDMI_CTRL_PLL_MASK,
 350                         CCM_HDMI_CTRL_PLL3);
 351
 352         /* Set ahb gating to pass */
 353         setbits_le32(&ccm->ahb_reset1_cfg, 1 << AHB_RESET_OFFSET_HDMI);
 354         setbits_le32(&ccm->ahb_reset1_cfg, 1 << AHB_RESET_OFFSET_HDMI2);
 355         setbits_le32(&ccm->ahb_gate1, 1 << AHB_GATE_OFFSET_HDMI);
 356         setbits_le32(&ccm->hdmi_slow_clk_cfg, CCM_HDMI_SLOW_CTRL_DDC_GATE);
 357
 358         /* Clock on */
 359         setbits_le32(&ccm->hdmi_clk_cfg, CCM_HDMI_CTRL_GATE);
 360
 361         sunxi_dw_hdmi_phy_init();
 362
 363         ret = sunxi_dw_hdmi_wait_for_hpd();
 364         if (ret < 0) {
 365                 debug("hdmi can not get hpd signal\n");
 366                 return -1;
 367         }
 368
 369         priv->hdmi.ioaddr = SUNXI_HDMI_BASE;
 370         priv->hdmi.i2c_clk_high = 0xd8;
 371         priv->hdmi.i2c_clk_low = 0xfe;
 372         priv->hdmi.reg_io_width = 1;
 373         priv->hdmi.phy_set = sunxi_dw_hdmi_phy_cfg;
 374         priv->mux = uc_plat->source_id;
 375
 376         uclass_get_device_by_phandle(UCLASS_I2C, dev, "ddc-i2c-bus",
 377                                      &priv->hdmi.ddc_bus);
 378
 379         dw_hdmi_init(&priv->hdmi);
 380
 381         return 0;
 382 }
 383
 384 static const struct dm_display_ops sunxi_dw_hdmi_ops = {
 385         .read_edid = sunxi_dw_hdmi_read_edid,
 386         .enable = sunxi_dw_hdmi_enable,
 387 };
 388
 389 U_BOOT_DRIVER(sunxi_dw_hdmi) = {
 390         .name   = "sunxi_dw_hdmi",
 391         .id     = UCLASS_DISPLAY,
 392         .ops    = &sunxi_dw_hdmi_ops,
 393         .probe  = sunxi_dw_hdmi_probe,
 394         .priv_auto_alloc_size = sizeof(struct sunxi_dw_hdmi_priv),
 395 };
 396
 397 U_BOOT_DEVICE(sunxi_dw_hdmi) = {
 398         .name = "sunxi_dw_hdmi"
 399 };