1 /* 2 * Freescale i.MX Frame Buffer device driver 3 * 4 * Copyright (C) 2004 Sascha Hauer, Pengutronix 5 * Based on acornfb.c Copyright (C) Russell King. 6 * 7 * This file is subject to the terms and conditions of the GNU General Public 8 * License. See the file COPYING in the main directory of this archive for 9 * more details. 10 * 11 * Please direct your questions and comments on this driver to the following 12 * email address: 13 * 14 * linux-arm-kernel@lists.arm.linux.org.uk 15 */ 16 17 #include <linux/module.h> 18 #include <linux/kernel.h> 19 #include <linux/errno.h> 20 #include <linux/string.h> 21 #include <linux/interrupt.h> 22 #include <linux/slab.h> 23 #include <linux/mm.h> 24 #include <linux/fb.h> 25 #include <linux/delay.h> 26 #include <linux/init.h> 27 #include <linux/ioport.h> 28 #include <linux/cpufreq.h> 29 #include <linux/clk.h> 30 #include <linux/platform_device.h> 31 #include <linux/dma-mapping.h> 32 #include <linux/io.h> 33 #include <linux/lcd.h> 34 #include <linux/math64.h> 35 #include <linux/of.h> 36 #include <linux/of_device.h> 37 38 #include <linux/regulator/consumer.h> 39 40 #include <video/of_display_timing.h> 41 #include <video/of_videomode.h> 42 #include <video/videomode.h> 43 44 #define PCR_TFT (1 << 31) 45 #define PCR_BPIX_8 (3 << 25) 46 #define PCR_BPIX_12 (4 << 25) 47 #define PCR_BPIX_16 (5 << 25) 48 #define PCR_BPIX_18 (6 << 25) 49 50 struct imx_fb_videomode { 51 struct fb_videomode mode; 52 u32 pcr; 53 bool aus_mode; 54 unsigned char bpp; 55 }; 56 57 /* 58 * Complain if VAR is out of range. 59 */ 60 #define DEBUG_VAR 1 61 62 #define DRIVER_NAME "imx-fb" 63 64 #define LCDC_SSA 0x00 65 66 #define LCDC_SIZE 0x04 67 #define SIZE_XMAX(x) ((((x) >> 4) & 0x3f) << 20) 68 69 #define YMAX_MASK_IMX1 0x1ff 70 #define YMAX_MASK_IMX21 0x3ff 71 72 #define LCDC_VPW 0x08 73 #define VPW_VPW(x) ((x) & 0x3ff) 74 75 #define LCDC_CPOS 0x0C 76 #define CPOS_CC1 (1<<31) 77 #define CPOS_CC0 (1<<30) 78 #define CPOS_OP (1<<28) 79 #define CPOS_CXP(x) (((x) & 3ff) << 16) 80 81 #define LCDC_LCWHB 0x10 82 #define LCWHB_BK_EN (1<<31) 83 #define LCWHB_CW(w) (((w) & 0x1f) << 24) 84 #define LCWHB_CH(h) (((h) & 0x1f) << 16) 85 #define LCWHB_BD(x) ((x) & 0xff) 86 87 #define LCDC_LCHCC 0x14 88 89 #define LCDC_PCR 0x18 90 91 #define LCDC_HCR 0x1C 92 #define HCR_H_WIDTH(x) (((x) & 0x3f) << 26) 93 #define HCR_H_WAIT_1(x) (((x) & 0xff) << 8) 94 #define HCR_H_WAIT_2(x) ((x) & 0xff) 95 96 #define LCDC_VCR 0x20 97 #define VCR_V_WIDTH(x) (((x) & 0x3f) << 26) 98 #define VCR_V_WAIT_1(x) (((x) & 0xff) << 8) 99 #define VCR_V_WAIT_2(x) ((x) & 0xff) 100 101 #define LCDC_POS 0x24 102 #define POS_POS(x) ((x) & 1f) 103 104 #define LCDC_LSCR1 0x28 105 /* bit fields in imxfb.h */ 106 107 #define LCDC_PWMR 0x2C 108 /* bit fields in imxfb.h */ 109 110 #define LCDC_DMACR 0x30 111 /* bit fields in imxfb.h */ 112 113 #define LCDC_RMCR 0x34 114 115 #define RMCR_LCDC_EN_MX1 (1<<1) 116 117 #define RMCR_SELF_REF (1<<0) 118 119 #define LCDC_LCDICR 0x38 120 #define LCDICR_INT_SYN (1<<2) 121 #define LCDICR_INT_CON (1) 122 123 #define LCDC_LCDISR 0x40 124 #define LCDISR_UDR_ERR (1<<3) 125 #define LCDISR_ERR_RES (1<<2) 126 #define LCDISR_EOF (1<<1) 127 #define LCDISR_BOF (1<<0) 128 129 #define IMXFB_LSCR1_DEFAULT 0x00120300 130 131 #define LCDC_LAUSCR 0x80 132 #define LAUSCR_AUS_MODE (1<<31) 133 134 /* Used fb-mode. Can be set on kernel command line, therefore file-static. */ 135 static const char *fb_mode; 136 137 /* 138 * These are the bitfields for each 139 * display depth that we support. 140 */ 141 struct imxfb_rgb { 142 struct fb_bitfield red; 143 struct fb_bitfield green; 144 struct fb_bitfield blue; 145 struct fb_bitfield transp; 146 }; 147 148 enum imxfb_type { 149 IMX1_FB, 150 IMX21_FB, 151 }; 152 153 struct imxfb_info { 154 struct platform_device *pdev; 155 void __iomem *regs; 156 struct clk *clk_ipg; 157 struct clk *clk_ahb; 158 struct clk *clk_per; 159 enum imxfb_type devtype; 160 bool enabled; 161 162 /* 163 * These are the addresses we mapped 164 * the framebuffer memory region to. 165 */ 166 dma_addr_t map_dma; 167 u_int map_size; 168 169 u_int palette_size; 170 171 dma_addr_t dbar1; 172 dma_addr_t dbar2; 173 174 u_int pcr; 175 u_int lauscr; 176 u_int pwmr; 177 u_int lscr1; 178 u_int dmacr; 179 bool cmap_inverse; 180 bool cmap_static; 181 182 struct imx_fb_videomode *mode; 183 int num_modes; 184 185 struct regulator *lcd_pwr; 186 int lcd_pwr_enabled; 187 }; 188 189 static const struct platform_device_id imxfb_devtype[] = { 190 { 191 .name = "imx1-fb", 192 .driver_data = IMX1_FB, 193 }, { 194 .name = "imx21-fb", 195 .driver_data = IMX21_FB, 196 }, { 197 /* sentinel */ 198 } 199 }; 200 MODULE_DEVICE_TABLE(platform, imxfb_devtype); 201 202 static const struct of_device_id imxfb_of_dev_id[] = { 203 { 204 .compatible = "fsl,imx1-fb", 205 .data = &imxfb_devtype[IMX1_FB], 206 }, { 207 .compatible = "fsl,imx21-fb", 208 .data = &imxfb_devtype[IMX21_FB], 209 }, { 210 /* sentinel */ 211 } 212 }; 213 MODULE_DEVICE_TABLE(of, imxfb_of_dev_id); 214 215 static inline int is_imx1_fb(struct imxfb_info *fbi) 216 { 217 return fbi->devtype == IMX1_FB; 218 } 219 220 #define IMX_NAME "IMX" 221 222 /* 223 * Minimum X and Y resolutions 224 */ 225 #define MIN_XRES 64 226 #define MIN_YRES 64 227 228 /* Actually this really is 18bit support, the lowest 2 bits of each colour 229 * are unused in hardware. We claim to have 24bit support to make software 230 * like X work, which does not support 18bit. 231 */ 232 static struct imxfb_rgb def_rgb_18 = { 233 .red = {.offset = 16, .length = 8,}, 234 .green = {.offset = 8, .length = 8,}, 235 .blue = {.offset = 0, .length = 8,}, 236 .transp = {.offset = 0, .length = 0,}, 237 }; 238 239 static struct imxfb_rgb def_rgb_16_tft = { 240 .red = {.offset = 11, .length = 5,}, 241 .green = {.offset = 5, .length = 6,}, 242 .blue = {.offset = 0, .length = 5,}, 243 .transp = {.offset = 0, .length = 0,}, 244 }; 245 246 static struct imxfb_rgb def_rgb_16_stn = { 247 .red = {.offset = 8, .length = 4,}, 248 .green = {.offset = 4, .length = 4,}, 249 .blue = {.offset = 0, .length = 4,}, 250 .transp = {.offset = 0, .length = 0,}, 251 }; 252 253 static struct imxfb_rgb def_rgb_8 = { 254 .red = {.offset = 0, .length = 8,}, 255 .green = {.offset = 0, .length = 8,}, 256 .blue = {.offset = 0, .length = 8,}, 257 .transp = {.offset = 0, .length = 0,}, 258 }; 259 260 static int imxfb_activate_var(struct fb_var_screeninfo *var, 261 struct fb_info *info); 262 263 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf) 264 { 265 chan &= 0xffff; 266 chan >>= 16 - bf->length; 267 return chan << bf->offset; 268 } 269 270 static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue, 271 u_int trans, struct fb_info *info) 272 { 273 struct imxfb_info *fbi = info->par; 274 u_int val, ret = 1; 275 276 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16) 277 if (regno < fbi->palette_size) { 278 val = (CNVT_TOHW(red, 4) << 8) | 279 (CNVT_TOHW(green,4) << 4) | 280 CNVT_TOHW(blue, 4); 281 282 writel(val, fbi->regs + 0x800 + (regno << 2)); 283 ret = 0; 284 } 285 return ret; 286 } 287 288 static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, 289 u_int trans, struct fb_info *info) 290 { 291 struct imxfb_info *fbi = info->par; 292 unsigned int val; 293 int ret = 1; 294 295 /* 296 * If inverse mode was selected, invert all the colours 297 * rather than the register number. The register number 298 * is what you poke into the framebuffer to produce the 299 * colour you requested. 300 */ 301 if (fbi->cmap_inverse) { 302 red = 0xffff - red; 303 green = 0xffff - green; 304 blue = 0xffff - blue; 305 } 306 307 /* 308 * If greyscale is true, then we convert the RGB value 309 * to greyscale no mater what visual we are using. 310 */ 311 if (info->var.grayscale) 312 red = green = blue = (19595 * red + 38470 * green + 313 7471 * blue) >> 16; 314 315 switch (info->fix.visual) { 316 case FB_VISUAL_TRUECOLOR: 317 /* 318 * 12 or 16-bit True Colour. We encode the RGB value 319 * according to the RGB bitfield information. 320 */ 321 if (regno < 16) { 322 u32 *pal = info->pseudo_palette; 323 324 val = chan_to_field(red, &info->var.red); 325 val |= chan_to_field(green, &info->var.green); 326 val |= chan_to_field(blue, &info->var.blue); 327 328 pal[regno] = val; 329 ret = 0; 330 } 331 break; 332 333 case FB_VISUAL_STATIC_PSEUDOCOLOR: 334 case FB_VISUAL_PSEUDOCOLOR: 335 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info); 336 break; 337 } 338 339 return ret; 340 } 341 342 static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi) 343 { 344 struct imx_fb_videomode *m; 345 int i; 346 347 if (!fb_mode) 348 return &fbi->mode[0]; 349 350 for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) { 351 if (!strcmp(m->mode.name, fb_mode)) 352 return m; 353 } 354 return NULL; 355 } 356 357 /* 358 * imxfb_check_var(): 359 * Round up in the following order: bits_per_pixel, xres, 360 * yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale, 361 * bitfields, horizontal timing, vertical timing. 362 */ 363 static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) 364 { 365 struct imxfb_info *fbi = info->par; 366 struct imxfb_rgb *rgb; 367 const struct imx_fb_videomode *imxfb_mode; 368 unsigned long lcd_clk; 369 unsigned long long tmp; 370 u32 pcr = 0; 371 372 if (var->xres < MIN_XRES) 373 var->xres = MIN_XRES; 374 if (var->yres < MIN_YRES) 375 var->yres = MIN_YRES; 376 377 imxfb_mode = imxfb_find_mode(fbi); 378 if (!imxfb_mode) 379 return -EINVAL; 380 381 var->xres = imxfb_mode->mode.xres; 382 var->yres = imxfb_mode->mode.yres; 383 var->bits_per_pixel = imxfb_mode->bpp; 384 var->pixclock = imxfb_mode->mode.pixclock; 385 var->hsync_len = imxfb_mode->mode.hsync_len; 386 var->left_margin = imxfb_mode->mode.left_margin; 387 var->right_margin = imxfb_mode->mode.right_margin; 388 var->vsync_len = imxfb_mode->mode.vsync_len; 389 var->upper_margin = imxfb_mode->mode.upper_margin; 390 var->lower_margin = imxfb_mode->mode.lower_margin; 391 var->sync = imxfb_mode->mode.sync; 392 var->xres_virtual = max(var->xres_virtual, var->xres); 393 var->yres_virtual = max(var->yres_virtual, var->yres); 394 395 pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel); 396 397 lcd_clk = clk_get_rate(fbi->clk_per); 398 399 tmp = var->pixclock * (unsigned long long)lcd_clk; 400 401 do_div(tmp, 1000000); 402 403 if (do_div(tmp, 1000000) > 500000) 404 tmp++; 405 406 pcr = (unsigned int)tmp; 407 408 if (--pcr > 0x3F) { 409 pcr = 0x3F; 410 printk(KERN_WARNING "Must limit pixel clock to %luHz\n", 411 lcd_clk / pcr); 412 } 413 414 switch (var->bits_per_pixel) { 415 case 32: 416 pcr |= PCR_BPIX_18; 417 rgb = &def_rgb_18; 418 break; 419 case 16: 420 default: 421 if (is_imx1_fb(fbi)) 422 pcr |= PCR_BPIX_12; 423 else 424 pcr |= PCR_BPIX_16; 425 426 if (imxfb_mode->pcr & PCR_TFT) 427 rgb = &def_rgb_16_tft; 428 else 429 rgb = &def_rgb_16_stn; 430 break; 431 case 8: 432 pcr |= PCR_BPIX_8; 433 rgb = &def_rgb_8; 434 break; 435 } 436 437 /* add sync polarities */ 438 pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25)); 439 440 fbi->pcr = pcr; 441 /* 442 * The LCDC AUS Mode Control Register does not exist on imx1. 443 */ 444 if (!is_imx1_fb(fbi) && imxfb_mode->aus_mode) 445 fbi->lauscr = LAUSCR_AUS_MODE; 446 447 /* 448 * Copy the RGB parameters for this display 449 * from the machine specific parameters. 450 */ 451 var->red = rgb->red; 452 var->green = rgb->green; 453 var->blue = rgb->blue; 454 var->transp = rgb->transp; 455 456 pr_debug("RGBT length = %d:%d:%d:%d\n", 457 var->red.length, var->green.length, var->blue.length, 458 var->transp.length); 459 460 pr_debug("RGBT offset = %d:%d:%d:%d\n", 461 var->red.offset, var->green.offset, var->blue.offset, 462 var->transp.offset); 463 464 return 0; 465 } 466 467 /* 468 * imxfb_set_par(): 469 * Set the user defined part of the display for the specified console 470 */ 471 static int imxfb_set_par(struct fb_info *info) 472 { 473 struct imxfb_info *fbi = info->par; 474 struct fb_var_screeninfo *var = &info->var; 475 476 if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32) 477 info->fix.visual = FB_VISUAL_TRUECOLOR; 478 else if (!fbi->cmap_static) 479 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 480 else { 481 /* 482 * Some people have weird ideas about wanting static 483 * pseudocolor maps. I suspect their user space 484 * applications are broken. 485 */ 486 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR; 487 } 488 489 info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8; 490 fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16; 491 492 imxfb_activate_var(var, info); 493 494 return 0; 495 } 496 497 static int imxfb_enable_controller(struct imxfb_info *fbi) 498 { 499 int ret; 500 501 if (fbi->enabled) 502 return 0; 503 504 pr_debug("Enabling LCD controller\n"); 505 506 writel(fbi->map_dma, fbi->regs + LCDC_SSA); 507 508 /* panning offset 0 (0 pixel offset) */ 509 writel(0x00000000, fbi->regs + LCDC_POS); 510 511 /* disable hardware cursor */ 512 writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1), 513 fbi->regs + LCDC_CPOS); 514 515 /* 516 * RMCR_LCDC_EN_MX1 is present on i.MX1 only, but doesn't hurt 517 * on other SoCs 518 */ 519 writel(RMCR_LCDC_EN_MX1, fbi->regs + LCDC_RMCR); 520 521 ret = clk_prepare_enable(fbi->clk_ipg); 522 if (ret) 523 goto err_enable_ipg; 524 525 ret = clk_prepare_enable(fbi->clk_ahb); 526 if (ret) 527 goto err_enable_ahb; 528 529 ret = clk_prepare_enable(fbi->clk_per); 530 if (ret) 531 goto err_enable_per; 532 533 fbi->enabled = true; 534 return 0; 535 536 err_enable_per: 537 clk_disable_unprepare(fbi->clk_ahb); 538 err_enable_ahb: 539 clk_disable_unprepare(fbi->clk_ipg); 540 err_enable_ipg: 541 writel(0, fbi->regs + LCDC_RMCR); 542 543 return ret; 544 } 545 546 static void imxfb_disable_controller(struct imxfb_info *fbi) 547 { 548 if (!fbi->enabled) 549 return; 550 551 pr_debug("Disabling LCD controller\n"); 552 553 clk_disable_unprepare(fbi->clk_per); 554 clk_disable_unprepare(fbi->clk_ahb); 555 clk_disable_unprepare(fbi->clk_ipg); 556 fbi->enabled = false; 557 558 writel(0, fbi->regs + LCDC_RMCR); 559 } 560 561 static int imxfb_blank(int blank, struct fb_info *info) 562 { 563 struct imxfb_info *fbi = info->par; 564 565 pr_debug("imxfb_blank: blank=%d\n", blank); 566 567 switch (blank) { 568 case FB_BLANK_POWERDOWN: 569 case FB_BLANK_VSYNC_SUSPEND: 570 case FB_BLANK_HSYNC_SUSPEND: 571 case FB_BLANK_NORMAL: 572 imxfb_disable_controller(fbi); 573 break; 574 575 case FB_BLANK_UNBLANK: 576 return imxfb_enable_controller(fbi); 577 } 578 return 0; 579 } 580 581 static const struct fb_ops imxfb_ops = { 582 .owner = THIS_MODULE, 583 .fb_check_var = imxfb_check_var, 584 .fb_set_par = imxfb_set_par, 585 .fb_setcolreg = imxfb_setcolreg, 586 .fb_fillrect = cfb_fillrect, 587 .fb_copyarea = cfb_copyarea, 588 .fb_imageblit = cfb_imageblit, 589 .fb_blank = imxfb_blank, 590 }; 591 592 /* 593 * imxfb_activate_var(): 594 * Configures LCD Controller based on entries in var parameter. Settings are 595 * only written to the controller if changes were made. 596 */ 597 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info) 598 { 599 struct imxfb_info *fbi = info->par; 600 u32 ymax_mask = is_imx1_fb(fbi) ? YMAX_MASK_IMX1 : YMAX_MASK_IMX21; 601 602 pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n", 603 var->xres, var->hsync_len, 604 var->left_margin, var->right_margin); 605 pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n", 606 var->yres, var->vsync_len, 607 var->upper_margin, var->lower_margin); 608 609 #if DEBUG_VAR 610 if (var->xres < 16 || var->xres > 1024) 611 printk(KERN_ERR "%s: invalid xres %d\n", 612 info->fix.id, var->xres); 613 if (var->hsync_len < 1 || var->hsync_len > 64) 614 printk(KERN_ERR "%s: invalid hsync_len %d\n", 615 info->fix.id, var->hsync_len); 616 if (var->left_margin > 255) 617 printk(KERN_ERR "%s: invalid left_margin %d\n", 618 info->fix.id, var->left_margin); 619 if (var->right_margin > 255) 620 printk(KERN_ERR "%s: invalid right_margin %d\n", 621 info->fix.id, var->right_margin); 622 if (var->yres < 1 || var->yres > ymax_mask) 623 printk(KERN_ERR "%s: invalid yres %d\n", 624 info->fix.id, var->yres); 625 if (var->vsync_len > 100) 626 printk(KERN_ERR "%s: invalid vsync_len %d\n", 627 info->fix.id, var->vsync_len); 628 if (var->upper_margin > 63) 629 printk(KERN_ERR "%s: invalid upper_margin %d\n", 630 info->fix.id, var->upper_margin); 631 if (var->lower_margin > 255) 632 printk(KERN_ERR "%s: invalid lower_margin %d\n", 633 info->fix.id, var->lower_margin); 634 #endif 635 636 /* physical screen start address */ 637 writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4), 638 fbi->regs + LCDC_VPW); 639 640 writel(HCR_H_WIDTH(var->hsync_len - 1) | 641 HCR_H_WAIT_1(var->right_margin - 1) | 642 HCR_H_WAIT_2(var->left_margin - 3), 643 fbi->regs + LCDC_HCR); 644 645 writel(VCR_V_WIDTH(var->vsync_len) | 646 VCR_V_WAIT_1(var->lower_margin) | 647 VCR_V_WAIT_2(var->upper_margin), 648 fbi->regs + LCDC_VCR); 649 650 writel(SIZE_XMAX(var->xres) | (var->yres & ymax_mask), 651 fbi->regs + LCDC_SIZE); 652 653 writel(fbi->pcr, fbi->regs + LCDC_PCR); 654 if (fbi->pwmr) 655 writel(fbi->pwmr, fbi->regs + LCDC_PWMR); 656 writel(fbi->lscr1, fbi->regs + LCDC_LSCR1); 657 658 /* dmacr = 0 is no valid value, as we need DMA control marks. */ 659 if (fbi->dmacr) 660 writel(fbi->dmacr, fbi->regs + LCDC_DMACR); 661 662 if (fbi->lauscr) 663 writel(fbi->lauscr, fbi->regs + LCDC_LAUSCR); 664 665 return 0; 666 } 667 668 static int imxfb_init_fbinfo(struct platform_device *pdev) 669 { 670 struct fb_info *info = platform_get_drvdata(pdev); 671 struct imxfb_info *fbi = info->par; 672 struct device_node *np; 673 674 pr_debug("%s\n",__func__); 675 676 info->pseudo_palette = kmalloc_array(16, sizeof(u32), GFP_KERNEL); 677 if (!info->pseudo_palette) 678 return -ENOMEM; 679 680 memset(fbi, 0, sizeof(struct imxfb_info)); 681 682 fbi->devtype = pdev->id_entry->driver_data; 683 684 strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id)); 685 686 info->fix.type = FB_TYPE_PACKED_PIXELS; 687 info->fix.type_aux = 0; 688 info->fix.xpanstep = 0; 689 info->fix.ypanstep = 0; 690 info->fix.ywrapstep = 0; 691 info->fix.accel = FB_ACCEL_NONE; 692 693 info->var.nonstd = 0; 694 info->var.activate = FB_ACTIVATE_NOW; 695 info->var.height = -1; 696 info->var.width = -1; 697 info->var.accel_flags = 0; 698 info->var.vmode = FB_VMODE_NONINTERLACED; 699 700 info->fbops = &imxfb_ops; 701 info->flags = FBINFO_FLAG_DEFAULT | 702 FBINFO_READS_FAST; 703 704 np = pdev->dev.of_node; 705 info->var.grayscale = of_property_read_bool(np, 706 "cmap-greyscale"); 707 fbi->cmap_inverse = of_property_read_bool(np, "cmap-inverse"); 708 fbi->cmap_static = of_property_read_bool(np, "cmap-static"); 709 710 fbi->lscr1 = IMXFB_LSCR1_DEFAULT; 711 712 of_property_read_u32(np, "fsl,lpccr", &fbi->pwmr); 713 714 of_property_read_u32(np, "fsl,lscr1", &fbi->lscr1); 715 716 of_property_read_u32(np, "fsl,dmacr", &fbi->dmacr); 717 718 return 0; 719 } 720 721 static int imxfb_of_read_mode(struct device *dev, struct device_node *np, 722 struct imx_fb_videomode *imxfb_mode) 723 { 724 int ret; 725 struct fb_videomode *of_mode = &imxfb_mode->mode; 726 u32 bpp; 727 u32 pcr; 728 729 ret = of_property_read_string(np, "model", &of_mode->name); 730 if (ret) 731 of_mode->name = NULL; 732 733 ret = of_get_fb_videomode(np, of_mode, OF_USE_NATIVE_MODE); 734 if (ret) { 735 dev_err(dev, "Failed to get videomode from DT\n"); 736 return ret; 737 } 738 739 ret = of_property_read_u32(np, "bits-per-pixel", &bpp); 740 ret |= of_property_read_u32(np, "fsl,pcr", &pcr); 741 742 if (ret) { 743 dev_err(dev, "Failed to read bpp and pcr from DT\n"); 744 return -EINVAL; 745 } 746 747 if (bpp < 1 || bpp > 255) { 748 dev_err(dev, "Bits per pixel have to be between 1 and 255\n"); 749 return -EINVAL; 750 } 751 752 imxfb_mode->bpp = bpp; 753 imxfb_mode->pcr = pcr; 754 755 /* 756 * fsl,aus-mode is optional 757 */ 758 imxfb_mode->aus_mode = of_property_read_bool(np, "fsl,aus-mode"); 759 760 return 0; 761 } 762 763 static int imxfb_lcd_check_fb(struct lcd_device *lcddev, struct fb_info *fi) 764 { 765 struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev); 766 767 if (!fi || fi->par == fbi) 768 return 1; 769 770 return 0; 771 } 772 773 static int imxfb_lcd_get_contrast(struct lcd_device *lcddev) 774 { 775 struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev); 776 777 return fbi->pwmr & 0xff; 778 } 779 780 static int imxfb_lcd_set_contrast(struct lcd_device *lcddev, int contrast) 781 { 782 struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev); 783 784 if (fbi->pwmr && fbi->enabled) { 785 if (contrast > 255) 786 contrast = 255; 787 else if (contrast < 0) 788 contrast = 0; 789 790 fbi->pwmr &= ~0xff; 791 fbi->pwmr |= contrast; 792 793 writel(fbi->pwmr, fbi->regs + LCDC_PWMR); 794 } 795 796 return 0; 797 } 798 799 static int imxfb_lcd_get_power(struct lcd_device *lcddev) 800 { 801 struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev); 802 803 if (!IS_ERR(fbi->lcd_pwr) && 804 !regulator_is_enabled(fbi->lcd_pwr)) 805 return FB_BLANK_POWERDOWN; 806 807 return FB_BLANK_UNBLANK; 808 } 809 810 static int imxfb_regulator_set(struct imxfb_info *fbi, int enable) 811 { 812 int ret; 813 814 if (enable == fbi->lcd_pwr_enabled) 815 return 0; 816 817 if (enable) 818 ret = regulator_enable(fbi->lcd_pwr); 819 else 820 ret = regulator_disable(fbi->lcd_pwr); 821 822 if (ret == 0) 823 fbi->lcd_pwr_enabled = enable; 824 825 return ret; 826 } 827 828 static int imxfb_lcd_set_power(struct lcd_device *lcddev, int power) 829 { 830 struct imxfb_info *fbi = dev_get_drvdata(&lcddev->dev); 831 832 if (!IS_ERR(fbi->lcd_pwr)) 833 return imxfb_regulator_set(fbi, power == FB_BLANK_UNBLANK); 834 835 return 0; 836 } 837 838 static struct lcd_ops imxfb_lcd_ops = { 839 .check_fb = imxfb_lcd_check_fb, 840 .get_contrast = imxfb_lcd_get_contrast, 841 .set_contrast = imxfb_lcd_set_contrast, 842 .get_power = imxfb_lcd_get_power, 843 .set_power = imxfb_lcd_set_power, 844 }; 845 846 static int imxfb_setup(void) 847 { 848 char *opt, *options = NULL; 849 850 if (fb_get_options("imxfb", &options)) 851 return -ENODEV; 852 853 if (!options || !*options) 854 return 0; 855 856 while ((opt = strsep(&options, ",")) != NULL) { 857 if (!*opt) 858 continue; 859 else 860 fb_mode = opt; 861 } 862 863 return 0; 864 } 865 866 static int imxfb_probe(struct platform_device *pdev) 867 { 868 struct imxfb_info *fbi; 869 struct lcd_device *lcd; 870 struct fb_info *info; 871 struct resource *res; 872 struct imx_fb_videomode *m; 873 const struct of_device_id *of_id; 874 struct device_node *display_np; 875 int ret, i; 876 int bytes_per_pixel; 877 878 dev_info(&pdev->dev, "i.MX Framebuffer driver\n"); 879 880 ret = imxfb_setup(); 881 if (ret < 0) 882 return ret; 883 884 of_id = of_match_device(imxfb_of_dev_id, &pdev->dev); 885 if (of_id) 886 pdev->id_entry = of_id->data; 887 888 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 889 if (!res) 890 return -ENODEV; 891 892 info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev); 893 if (!info) 894 return -ENOMEM; 895 896 fbi = info->par; 897 898 platform_set_drvdata(pdev, info); 899 900 ret = imxfb_init_fbinfo(pdev); 901 if (ret < 0) 902 goto failed_init; 903 904 fb_mode = NULL; 905 906 display_np = of_parse_phandle(pdev->dev.of_node, "display", 0); 907 if (!display_np) { 908 dev_err(&pdev->dev, "No display defined in devicetree\n"); 909 ret = -EINVAL; 910 goto failed_of_parse; 911 } 912 913 /* 914 * imxfb does not support more modes, we choose only the native 915 * mode. 916 */ 917 fbi->num_modes = 1; 918 919 fbi->mode = devm_kzalloc(&pdev->dev, 920 sizeof(struct imx_fb_videomode), GFP_KERNEL); 921 if (!fbi->mode) { 922 ret = -ENOMEM; 923 of_node_put(display_np); 924 goto failed_of_parse; 925 } 926 927 ret = imxfb_of_read_mode(&pdev->dev, display_np, fbi->mode); 928 of_node_put(display_np); 929 if (ret) 930 goto failed_of_parse; 931 932 /* Calculate maximum bytes used per pixel. In most cases this should 933 * be the same as m->bpp/8 */ 934 m = &fbi->mode[0]; 935 bytes_per_pixel = (m->bpp + 7) / 8; 936 for (i = 0; i < fbi->num_modes; i++, m++) 937 info->fix.smem_len = max_t(size_t, info->fix.smem_len, 938 m->mode.xres * m->mode.yres * bytes_per_pixel); 939 940 fbi->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); 941 if (IS_ERR(fbi->clk_ipg)) { 942 ret = PTR_ERR(fbi->clk_ipg); 943 goto failed_getclock; 944 } 945 946 /* 947 * The LCDC controller does not have an enable bit. The 948 * controller starts directly when the clocks are enabled. 949 * If the clocks are enabled when the controller is not yet 950 * programmed with proper register values (enabled at the 951 * bootloader, for example) then it just goes into some undefined 952 * state. 953 * To avoid this issue, let's enable and disable LCDC IPG clock 954 * so that we force some kind of 'reset' to the LCDC block. 955 */ 956 ret = clk_prepare_enable(fbi->clk_ipg); 957 if (ret) 958 goto failed_getclock; 959 clk_disable_unprepare(fbi->clk_ipg); 960 961 fbi->clk_ahb = devm_clk_get(&pdev->dev, "ahb"); 962 if (IS_ERR(fbi->clk_ahb)) { 963 ret = PTR_ERR(fbi->clk_ahb); 964 goto failed_getclock; 965 } 966 967 fbi->clk_per = devm_clk_get(&pdev->dev, "per"); 968 if (IS_ERR(fbi->clk_per)) { 969 ret = PTR_ERR(fbi->clk_per); 970 goto failed_getclock; 971 } 972 973 fbi->regs = devm_ioremap_resource(&pdev->dev, res); 974 if (IS_ERR(fbi->regs)) { 975 dev_err(&pdev->dev, "Cannot map frame buffer registers\n"); 976 ret = PTR_ERR(fbi->regs); 977 goto failed_ioremap; 978 } 979 980 fbi->map_size = PAGE_ALIGN(info->fix.smem_len); 981 info->screen_buffer = dma_alloc_wc(&pdev->dev, fbi->map_size, 982 &fbi->map_dma, GFP_KERNEL); 983 if (!info->screen_buffer) { 984 dev_err(&pdev->dev, "Failed to allocate video RAM\n"); 985 ret = -ENOMEM; 986 goto failed_map; 987 } 988 989 info->fix.smem_start = fbi->map_dma; 990 991 INIT_LIST_HEAD(&info->modelist); 992 for (i = 0; i < fbi->num_modes; i++) 993 fb_add_videomode(&fbi->mode[i].mode, &info->modelist); 994 995 /* 996 * This makes sure that our colour bitfield 997 * descriptors are correctly initialised. 998 */ 999 imxfb_check_var(&info->var, info); 1000 1001 /* 1002 * For modes > 8bpp, the color map is bypassed. 1003 * Therefore, 256 entries are enough. 1004 */ 1005 ret = fb_alloc_cmap(&info->cmap, 256, 0); 1006 if (ret < 0) 1007 goto failed_cmap; 1008 1009 imxfb_set_par(info); 1010 ret = register_framebuffer(info); 1011 if (ret < 0) { 1012 dev_err(&pdev->dev, "failed to register framebuffer\n"); 1013 goto failed_register; 1014 } 1015 1016 fbi->lcd_pwr = devm_regulator_get(&pdev->dev, "lcd"); 1017 if (PTR_ERR(fbi->lcd_pwr) == -EPROBE_DEFER) { 1018 ret = -EPROBE_DEFER; 1019 goto failed_lcd; 1020 } 1021 1022 lcd = devm_lcd_device_register(&pdev->dev, "imxfb-lcd", &pdev->dev, fbi, 1023 &imxfb_lcd_ops); 1024 if (IS_ERR(lcd)) { 1025 ret = PTR_ERR(lcd); 1026 goto failed_lcd; 1027 } 1028 1029 lcd->props.max_contrast = 0xff; 1030 1031 imxfb_enable_controller(fbi); 1032 fbi->pdev = pdev; 1033 1034 return 0; 1035 1036 failed_lcd: 1037 unregister_framebuffer(info); 1038 1039 failed_register: 1040 fb_dealloc_cmap(&info->cmap); 1041 failed_cmap: 1042 dma_free_wc(&pdev->dev, fbi->map_size, info->screen_buffer, 1043 fbi->map_dma); 1044 failed_map: 1045 failed_ioremap: 1046 failed_getclock: 1047 release_mem_region(res->start, resource_size(res)); 1048 failed_of_parse: 1049 kfree(info->pseudo_palette); 1050 failed_init: 1051 framebuffer_release(info); 1052 return ret; 1053 } 1054 1055 static int imxfb_remove(struct platform_device *pdev) 1056 { 1057 struct fb_info *info = platform_get_drvdata(pdev); 1058 struct imxfb_info *fbi = info->par; 1059 1060 imxfb_disable_controller(fbi); 1061 1062 unregister_framebuffer(info); 1063 fb_dealloc_cmap(&info->cmap); 1064 dma_free_wc(&pdev->dev, fbi->map_size, info->screen_buffer, 1065 fbi->map_dma); 1066 kfree(info->pseudo_palette); 1067 framebuffer_release(info); 1068 1069 return 0; 1070 } 1071 1072 static int __maybe_unused imxfb_suspend(struct device *dev) 1073 { 1074 struct fb_info *info = dev_get_drvdata(dev); 1075 struct imxfb_info *fbi = info->par; 1076 1077 imxfb_disable_controller(fbi); 1078 1079 return 0; 1080 } 1081 1082 static int __maybe_unused imxfb_resume(struct device *dev) 1083 { 1084 struct fb_info *info = dev_get_drvdata(dev); 1085 struct imxfb_info *fbi = info->par; 1086 1087 imxfb_enable_controller(fbi); 1088 1089 return 0; 1090 } 1091 1092 static SIMPLE_DEV_PM_OPS(imxfb_pm_ops, imxfb_suspend, imxfb_resume); 1093 1094 static struct platform_driver imxfb_driver = { 1095 .driver = { 1096 .name = DRIVER_NAME, 1097 .of_match_table = imxfb_of_dev_id, 1098 .pm = &imxfb_pm_ops, 1099 }, 1100 .probe = imxfb_probe, 1101 .remove = imxfb_remove, 1102 .id_table = imxfb_devtype, 1103 }; 1104 module_platform_driver(imxfb_driver); 1105 1106 MODULE_DESCRIPTION("Freescale i.MX framebuffer driver"); 1107 MODULE_AUTHOR("Sascha Hauer, Pengutronix"); 1108 MODULE_LICENSE("GPL"); 1109