1 /* 2 * Copyright (C) 2017-2018 STMicroelectronics - All Rights Reserved 3 * Author(s): Philippe Cornu <philippe.cornu@st.com> for STMicroelectronics. 4 * Yannick Fertre <yannick.fertre@st.com> for STMicroelectronics. 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.h> 10 #include <clk.h> 11 #include <dm.h> 12 #include <panel.h> 13 #include <reset.h> 14 #include <video.h> 15 #include <asm/io.h> 16 #include <asm/arch/gpio.h> 17 #include <dm/device-internal.h> 18 19 DECLARE_GLOBAL_DATA_PTR; 20 21 struct stm32_ltdc_priv { 22 void __iomem *regs; 23 struct display_timing timing; 24 enum video_log2_bpp l2bpp; 25 u32 bg_col_argb; 26 u32 crop_x, crop_y, crop_w, crop_h; 27 u32 alpha; 28 }; 29 30 /* LTDC main registers */ 31 #define LTDC_IDR 0x00 /* IDentification */ 32 #define LTDC_LCR 0x04 /* Layer Count */ 33 #define LTDC_SSCR 0x08 /* Synchronization Size Configuration */ 34 #define LTDC_BPCR 0x0C /* Back Porch Configuration */ 35 #define LTDC_AWCR 0x10 /* Active Width Configuration */ 36 #define LTDC_TWCR 0x14 /* Total Width Configuration */ 37 #define LTDC_GCR 0x18 /* Global Control */ 38 #define LTDC_GC1R 0x1C /* Global Configuration 1 */ 39 #define LTDC_GC2R 0x20 /* Global Configuration 2 */ 40 #define LTDC_SRCR 0x24 /* Shadow Reload Configuration */ 41 #define LTDC_GACR 0x28 /* GAmma Correction */ 42 #define LTDC_BCCR 0x2C /* Background Color Configuration */ 43 #define LTDC_IER 0x34 /* Interrupt Enable */ 44 #define LTDC_ISR 0x38 /* Interrupt Status */ 45 #define LTDC_ICR 0x3C /* Interrupt Clear */ 46 #define LTDC_LIPCR 0x40 /* Line Interrupt Position Conf. */ 47 #define LTDC_CPSR 0x44 /* Current Position Status */ 48 #define LTDC_CDSR 0x48 /* Current Display Status */ 49 50 /* LTDC layer 1 registers */ 51 #define LTDC_L1LC1R 0x80 /* L1 Layer Configuration 1 */ 52 #define LTDC_L1LC2R 0x84 /* L1 Layer Configuration 2 */ 53 #define LTDC_L1CR 0x84 /* L1 Control */ 54 #define LTDC_L1WHPCR 0x88 /* L1 Window Hor Position Config */ 55 #define LTDC_L1WVPCR 0x8C /* L1 Window Vert Position Config */ 56 #define LTDC_L1CKCR 0x90 /* L1 Color Keying Configuration */ 57 #define LTDC_L1PFCR 0x94 /* L1 Pixel Format Configuration */ 58 #define LTDC_L1CACR 0x98 /* L1 Constant Alpha Config */ 59 #define LTDC_L1DCCR 0x9C /* L1 Default Color Configuration */ 60 #define LTDC_L1BFCR 0xA0 /* L1 Blend Factors Configuration */ 61 #define LTDC_L1FBBCR 0xA4 /* L1 FrameBuffer Bus Control */ 62 #define LTDC_L1AFBCR 0xA8 /* L1 AuxFB Control */ 63 #define LTDC_L1CFBAR 0xAC /* L1 Color FrameBuffer Address */ 64 #define LTDC_L1CFBLR 0xB0 /* L1 Color FrameBuffer Length */ 65 #define LTDC_L1CFBLNR 0xB4 /* L1 Color FrameBuffer Line Nb */ 66 #define LTDC_L1AFBAR 0xB8 /* L1 AuxFB Address */ 67 #define LTDC_L1AFBLR 0xBC /* L1 AuxFB Length */ 68 #define LTDC_L1AFBLNR 0xC0 /* L1 AuxFB Line Number */ 69 #define LTDC_L1CLUTWR 0xC4 /* L1 CLUT Write */ 70 71 /* Bit definitions */ 72 #define SSCR_VSH GENMASK(10, 0) /* Vertical Synchronization Height */ 73 #define SSCR_HSW GENMASK(27, 16) /* Horizontal Synchronization Width */ 74 75 #define BPCR_AVBP GENMASK(10, 0) /* Accumulated Vertical Back Porch */ 76 #define BPCR_AHBP GENMASK(27, 16) /* Accumulated Horizontal Back Porch */ 77 78 #define AWCR_AAH GENMASK(10, 0) /* Accumulated Active Height */ 79 #define AWCR_AAW GENMASK(27, 16) /* Accumulated Active Width */ 80 81 #define TWCR_TOTALH GENMASK(10, 0) /* TOTAL Height */ 82 #define TWCR_TOTALW GENMASK(27, 16) /* TOTAL Width */ 83 84 #define GCR_LTDCEN BIT(0) /* LTDC ENable */ 85 #define GCR_DEN BIT(16) /* Dither ENable */ 86 #define GCR_PCPOL BIT(28) /* Pixel Clock POLarity-Inverted */ 87 #define GCR_DEPOL BIT(29) /* Data Enable POLarity-High */ 88 #define GCR_VSPOL BIT(30) /* Vertical Synchro POLarity-High */ 89 #define GCR_HSPOL BIT(31) /* Horizontal Synchro POLarity-High */ 90 91 #define GC1R_WBCH GENMASK(3, 0) /* Width of Blue CHannel output */ 92 #define GC1R_WGCH GENMASK(7, 4) /* Width of Green Channel output */ 93 #define GC1R_WRCH GENMASK(11, 8) /* Width of Red Channel output */ 94 #define GC1R_PBEN BIT(12) /* Precise Blending ENable */ 95 #define GC1R_DT GENMASK(15, 14) /* Dithering Technique */ 96 #define GC1R_GCT GENMASK(19, 17) /* Gamma Correction Technique */ 97 #define GC1R_SHREN BIT(21) /* SHadow Registers ENabled */ 98 #define GC1R_BCP BIT(22) /* Background Colour Programmable */ 99 #define GC1R_BBEN BIT(23) /* Background Blending ENabled */ 100 #define GC1R_LNIP BIT(24) /* Line Number IRQ Position */ 101 #define GC1R_TP BIT(25) /* Timing Programmable */ 102 #define GC1R_IPP BIT(26) /* IRQ Polarity Programmable */ 103 #define GC1R_SPP BIT(27) /* Sync Polarity Programmable */ 104 #define GC1R_DWP BIT(28) /* Dither Width Programmable */ 105 #define GC1R_STREN BIT(29) /* STatus Registers ENabled */ 106 #define GC1R_BMEN BIT(31) /* Blind Mode ENabled */ 107 108 #define GC2R_EDCA BIT(0) /* External Display Control Ability */ 109 #define GC2R_STSAEN BIT(1) /* Slave Timing Sync Ability ENabled */ 110 #define GC2R_DVAEN BIT(2) /* Dual-View Ability ENabled */ 111 #define GC2R_DPAEN BIT(3) /* Dual-Port Ability ENabled */ 112 #define GC2R_BW GENMASK(6, 4) /* Bus Width (log2 of nb of bytes) */ 113 #define GC2R_EDCEN BIT(7) /* External Display Control ENabled */ 114 115 #define SRCR_IMR BIT(0) /* IMmediate Reload */ 116 #define SRCR_VBR BIT(1) /* Vertical Blanking Reload */ 117 118 #define LXCR_LEN BIT(0) /* Layer ENable */ 119 #define LXCR_COLKEN BIT(1) /* Color Keying Enable */ 120 #define LXCR_CLUTEN BIT(4) /* Color Look-Up Table ENable */ 121 122 #define LXWHPCR_WHSTPOS GENMASK(11, 0) /* Window Horizontal StarT POSition */ 123 #define LXWHPCR_WHSPPOS GENMASK(27, 16) /* Window Horizontal StoP POSition */ 124 125 #define LXWVPCR_WVSTPOS GENMASK(10, 0) /* Window Vertical StarT POSition */ 126 #define LXWVPCR_WVSPPOS GENMASK(26, 16) /* Window Vertical StoP POSition */ 127 128 #define LXPFCR_PF GENMASK(2, 0) /* Pixel Format */ 129 130 #define LXCACR_CONSTA GENMASK(7, 0) /* CONSTant Alpha */ 131 132 #define LXBFCR_BF2 GENMASK(2, 0) /* Blending Factor 2 */ 133 #define LXBFCR_BF1 GENMASK(10, 8) /* Blending Factor 1 */ 134 135 #define LXCFBLR_CFBLL GENMASK(12, 0) /* Color Frame Buffer Line Length */ 136 #define LXCFBLR_CFBP GENMASK(28, 16) /* Color Frame Buffer Pitch in bytes */ 137 138 #define LXCFBLNR_CFBLN GENMASK(10, 0) /* Color Frame Buffer Line Number */ 139 140 #define BF1_PAXCA 0x600 /* Pixel Alpha x Constant Alpha */ 141 #define BF1_CA 0x400 /* Constant Alpha */ 142 #define BF2_1PAXCA 0x007 /* 1 - (Pixel Alpha x Constant Alpha) */ 143 #define BF2_1CA 0x005 /* 1 - Constant Alpha */ 144 145 enum stm32_ltdc_pix_fmt { 146 PF_ARGB8888 = 0, 147 PF_RGB888, 148 PF_RGB565, 149 PF_ARGB1555, 150 PF_ARGB4444, 151 PF_L8, 152 PF_AL44, 153 PF_AL88 154 }; 155 156 /* TODO add more color format support */ 157 static u32 stm32_ltdc_get_pixel_format(enum video_log2_bpp l2bpp) 158 { 159 enum stm32_ltdc_pix_fmt pf; 160 161 switch (l2bpp) { 162 case VIDEO_BPP16: 163 pf = PF_RGB565; 164 break; 165 166 case VIDEO_BPP32: 167 pf = PF_ARGB8888; 168 break; 169 170 case VIDEO_BPP8: 171 pf = PF_L8; 172 break; 173 174 case VIDEO_BPP1: 175 case VIDEO_BPP2: 176 case VIDEO_BPP4: 177 default: 178 debug("%s: warning %dbpp not supported yet, %dbpp instead\n", 179 __func__, VNBITS(l2bpp), VNBITS(VIDEO_BPP16)); 180 pf = PF_RGB565; 181 break; 182 } 183 184 debug("%s: %d bpp -> ltdc pf %d\n", __func__, VNBITS(l2bpp), pf); 185 186 return (u32)pf; 187 } 188 189 static bool has_alpha(u32 fmt) 190 { 191 switch (fmt) { 192 case PF_ARGB8888: 193 case PF_ARGB1555: 194 case PF_ARGB4444: 195 case PF_AL44: 196 case PF_AL88: 197 return true; 198 case PF_RGB888: 199 case PF_RGB565: 200 case PF_L8: 201 default: 202 return false; 203 } 204 } 205 206 static void stm32_ltdc_enable(struct stm32_ltdc_priv *priv) 207 { 208 /* Reload configuration immediately & enable LTDC */ 209 setbits_le32(priv->regs + LTDC_SRCR, SRCR_IMR); 210 setbits_le32(priv->regs + LTDC_GCR, GCR_LTDCEN); 211 } 212 213 static void stm32_ltdc_set_mode(struct stm32_ltdc_priv *priv) 214 { 215 void __iomem *regs = priv->regs; 216 struct display_timing *timing = &priv->timing; 217 u32 hsync, vsync, acc_hbp, acc_vbp, acc_act_w, acc_act_h; 218 u32 total_w, total_h; 219 u32 val; 220 221 /* Convert video timings to ltdc timings */ 222 hsync = timing->hsync_len.typ - 1; 223 vsync = timing->vsync_len.typ - 1; 224 acc_hbp = hsync + timing->hback_porch.typ; 225 acc_vbp = vsync + timing->vback_porch.typ; 226 acc_act_w = acc_hbp + timing->hactive.typ; 227 acc_act_h = acc_vbp + timing->vactive.typ; 228 total_w = acc_act_w + timing->hfront_porch.typ; 229 total_h = acc_act_h + timing->vfront_porch.typ; 230 231 /* Synchronization sizes */ 232 val = (hsync << 16) | vsync; 233 clrsetbits_le32(regs + LTDC_SSCR, SSCR_VSH | SSCR_HSW, val); 234 235 /* Accumulated back porch */ 236 val = (acc_hbp << 16) | acc_vbp; 237 clrsetbits_le32(regs + LTDC_BPCR, BPCR_AVBP | BPCR_AHBP, val); 238 239 /* Accumulated active width */ 240 val = (acc_act_w << 16) | acc_act_h; 241 clrsetbits_le32(regs + LTDC_AWCR, AWCR_AAW | AWCR_AAH, val); 242 243 /* Total width & height */ 244 val = (total_w << 16) | total_h; 245 clrsetbits_le32(regs + LTDC_TWCR, TWCR_TOTALH | TWCR_TOTALW, val); 246 247 setbits_le32(regs + LTDC_LIPCR, acc_act_h + 1); 248 249 /* Signal polarities */ 250 val = 0; 251 debug("%s: timing->flags 0x%08x\n", __func__, timing->flags); 252 if (timing->flags & DISPLAY_FLAGS_HSYNC_HIGH) 253 val |= GCR_HSPOL; 254 if (timing->flags & DISPLAY_FLAGS_VSYNC_HIGH) 255 val |= GCR_VSPOL; 256 if (timing->flags & DISPLAY_FLAGS_DE_HIGH) 257 val |= GCR_DEPOL; 258 if (timing->flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE) 259 val |= GCR_PCPOL; 260 clrsetbits_le32(regs + LTDC_GCR, 261 GCR_HSPOL | GCR_VSPOL | GCR_DEPOL | GCR_PCPOL, val); 262 263 /* Overall background color */ 264 writel(priv->bg_col_argb, priv->regs + LTDC_BCCR); 265 } 266 267 static void stm32_ltdc_set_layer1(struct stm32_ltdc_priv *priv, ulong fb_addr) 268 { 269 void __iomem *regs = priv->regs; 270 u32 x0, x1, y0, y1; 271 u32 pitch_in_bytes; 272 u32 line_length; 273 u32 bus_width; 274 u32 val, tmp, bpp; 275 u32 format; 276 277 x0 = priv->crop_x; 278 x1 = priv->crop_x + priv->crop_w - 1; 279 y0 = priv->crop_y; 280 y1 = priv->crop_y + priv->crop_h - 1; 281 282 /* Horizontal start and stop position */ 283 tmp = (readl(regs + LTDC_BPCR) & BPCR_AHBP) >> 16; 284 val = ((x1 + 1 + tmp) << 16) + (x0 + 1 + tmp); 285 clrsetbits_le32(regs + LTDC_L1WHPCR, LXWHPCR_WHSTPOS | LXWHPCR_WHSPPOS, 286 val); 287 288 /* Vertical start & stop position */ 289 tmp = readl(regs + LTDC_BPCR) & BPCR_AVBP; 290 val = ((y1 + 1 + tmp) << 16) + (y0 + 1 + tmp); 291 clrsetbits_le32(regs + LTDC_L1WVPCR, LXWVPCR_WVSTPOS | LXWVPCR_WVSPPOS, 292 val); 293 294 /* Layer background color */ 295 writel(priv->bg_col_argb, regs + LTDC_L1DCCR); 296 297 /* Color frame buffer pitch in bytes & line length */ 298 bpp = VNBITS(priv->l2bpp); 299 pitch_in_bytes = priv->crop_w * (bpp >> 3); 300 bus_width = 8 << ((readl(regs + LTDC_GC2R) & GC2R_BW) >> 4); 301 line_length = ((bpp >> 3) * priv->crop_w) + (bus_width >> 3) - 1; 302 val = (pitch_in_bytes << 16) | line_length; 303 clrsetbits_le32(regs + LTDC_L1CFBLR, LXCFBLR_CFBLL | LXCFBLR_CFBP, val); 304 305 /* Pixel format */ 306 format = stm32_ltdc_get_pixel_format(priv->l2bpp); 307 clrsetbits_le32(regs + LTDC_L1PFCR, LXPFCR_PF, format); 308 309 /* Constant alpha value */ 310 clrsetbits_le32(regs + LTDC_L1CACR, LXCACR_CONSTA, priv->alpha); 311 312 /* Specifies the blending factors : with or without pixel alpha */ 313 /* Manage hw-specific capabilities */ 314 val = has_alpha(format) ? BF1_PAXCA | BF2_1PAXCA : BF1_CA | BF2_1CA; 315 316 /* Blending factors */ 317 clrsetbits_le32(regs + LTDC_L1BFCR, LXBFCR_BF2 | LXBFCR_BF1, val); 318 319 /* Frame buffer line number */ 320 clrsetbits_le32(regs + LTDC_L1CFBLNR, LXCFBLNR_CFBLN, priv->crop_h); 321 322 /* Frame buffer address */ 323 writel(fb_addr, regs + LTDC_L1CFBAR); 324 325 /* Enable layer 1 */ 326 setbits_le32(priv->regs + LTDC_L1CR, LXCR_LEN); 327 } 328 329 static int stm32_ltdc_probe(struct udevice *dev) 330 { 331 struct video_uc_platdata *uc_plat = dev_get_uclass_platdata(dev); 332 struct video_priv *uc_priv = dev_get_uclass_priv(dev); 333 struct stm32_ltdc_priv *priv = dev_get_priv(dev); 334 struct udevice *panel; 335 struct clk pclk; 336 struct reset_ctl rst; 337 int rate, ret; 338 339 priv->regs = (void *)dev_read_addr(dev); 340 if ((fdt_addr_t)priv->regs == FDT_ADDR_T_NONE) { 341 debug("%s: ltdc dt register address error\n", __func__); 342 return -EINVAL; 343 } 344 345 ret = clk_get_by_index(dev, 0, &pclk); 346 if (ret) { 347 debug("%s: peripheral clock get error %d\n", __func__, ret); 348 return ret; 349 } 350 351 ret = clk_enable(&pclk); 352 if (ret) { 353 debug("%s: peripheral clock enable error %d\n", 354 __func__, ret); 355 return ret; 356 } 357 358 ret = reset_get_by_index(dev, 0, &rst); 359 if (ret) { 360 debug("%s: missing ltdc hardware reset\n", __func__); 361 return -ENODEV; 362 } 363 364 /* Reset */ 365 reset_deassert(&rst); 366 367 ret = uclass_first_device(UCLASS_PANEL, &panel); 368 if (ret) { 369 debug("%s: panel device error %d\n", __func__, ret); 370 return ret; 371 } 372 373 ret = panel_enable_backlight(panel); 374 if (ret) { 375 debug("%s: panel %s enable backlight error %d\n", 376 __func__, panel->name, ret); 377 return ret; 378 } 379 380 ret = fdtdec_decode_display_timing(gd->fdt_blob, 381 dev_of_offset(dev), 0, 382 &priv->timing); 383 if (ret) { 384 debug("%s: decode display timing error %d\n", 385 __func__, ret); 386 return -EINVAL; 387 } 388 389 rate = clk_set_rate(&pclk, priv->timing.pixelclock.typ); 390 if (rate < 0) { 391 debug("%s: fail to set pixel clock %d hz %d hz\n", 392 __func__, priv->timing.pixelclock.typ, rate); 393 return rate; 394 } 395 396 debug("%s: Set pixel clock req %d hz get %d hz\n", __func__, 397 priv->timing.pixelclock.typ, rate); 398 399 /* TODO Below parameters are hard-coded for the moment... */ 400 priv->l2bpp = VIDEO_BPP16; 401 priv->bg_col_argb = 0xFFFFFFFF; /* white no transparency */ 402 priv->crop_x = 0; 403 priv->crop_y = 0; 404 priv->crop_w = priv->timing.hactive.typ; 405 priv->crop_h = priv->timing.vactive.typ; 406 priv->alpha = 0xFF; 407 408 debug("%s: %dx%d %dbpp frame buffer at 0x%lx\n", __func__, 409 priv->timing.hactive.typ, priv->timing.vactive.typ, 410 VNBITS(priv->l2bpp), uc_plat->base); 411 debug("%s: crop %d,%d %dx%d bg 0x%08x alpha %d\n", __func__, 412 priv->crop_x, priv->crop_y, priv->crop_w, priv->crop_h, 413 priv->bg_col_argb, priv->alpha); 414 415 /* Configure & start LTDC */ 416 stm32_ltdc_set_mode(priv); 417 stm32_ltdc_set_layer1(priv, uc_plat->base); 418 stm32_ltdc_enable(priv); 419 420 uc_priv->xsize = priv->timing.hactive.typ; 421 uc_priv->ysize = priv->timing.vactive.typ; 422 uc_priv->bpix = priv->l2bpp; 423 424 video_set_flush_dcache(dev, true); 425 426 return 0; 427 } 428 429 static int stm32_ltdc_bind(struct udevice *dev) 430 { 431 struct video_uc_platdata *uc_plat = dev_get_uclass_platdata(dev); 432 433 uc_plat->size = CONFIG_VIDEO_STM32_MAX_XRES * 434 CONFIG_VIDEO_STM32_MAX_YRES * 435 (CONFIG_VIDEO_STM32_MAX_BPP >> 3); 436 debug("%s: frame buffer max size %d bytes\n", __func__, uc_plat->size); 437 438 return 0; 439 } 440 441 static const struct udevice_id stm32_ltdc_ids[] = { 442 { .compatible = "st,stm32-ltdc" }, 443 { } 444 }; 445 446 U_BOOT_DRIVER(stm32_ltdc) = { 447 .name = "stm32_display", 448 .id = UCLASS_VIDEO, 449 .of_match = stm32_ltdc_ids, 450 .probe = stm32_ltdc_probe, 451 .bind = stm32_ltdc_bind, 452 .priv_auto_alloc_size = sizeof(struct stm32_ltdc_priv), 453 }; 454