1 /* 2 * linux/drivers/video/pxa168fb.c -- Marvell PXA168 LCD Controller 3 * 4 * Copyright (C) 2008 Marvell International Ltd. 5 * All rights reserved. 6 * 7 * 2009-02-16 adapted from original version for PXA168/910 8 * Jun Nie <njun@marvell.com> 9 * 10 * This file is subject to the terms and conditions of the GNU General Public 11 * License. See the file COPYING in the main directory of this archive for 12 * more details. 13 */ 14 15 #include <linux/module.h> 16 #include <linux/kernel.h> 17 #include <linux/sched.h> 18 #include <linux/string.h> 19 #include <linux/interrupt.h> 20 #include <linux/slab.h> 21 #include <linux/fb.h> 22 #include <linux/delay.h> 23 #include <linux/init.h> 24 #include <linux/io.h> 25 #include <linux/ioport.h> 26 #include <linux/platform_device.h> 27 #include <linux/dma-mapping.h> 28 #include <linux/clk.h> 29 #include <linux/err.h> 30 #include <linux/uaccess.h> 31 #include <video/pxa168fb.h> 32 33 #include "pxa168fb.h" 34 35 #define DEFAULT_REFRESH 60 /* Hz */ 36 37 static int determine_best_pix_fmt(struct fb_var_screeninfo *var) 38 { 39 /* 40 * Pseudocolor mode? 41 */ 42 if (var->bits_per_pixel == 8) 43 return PIX_FMT_PSEUDOCOLOR; 44 45 /* 46 * Check for 565/1555. 47 */ 48 if (var->bits_per_pixel == 16 && var->red.length <= 5 && 49 var->green.length <= 6 && var->blue.length <= 5) { 50 if (var->transp.length == 0) { 51 if (var->red.offset >= var->blue.offset) 52 return PIX_FMT_RGB565; 53 else 54 return PIX_FMT_BGR565; 55 } 56 57 if (var->transp.length == 1 && var->green.length <= 5) { 58 if (var->red.offset >= var->blue.offset) 59 return PIX_FMT_RGB1555; 60 else 61 return PIX_FMT_BGR1555; 62 } 63 } 64 65 /* 66 * Check for 888/A888. 67 */ 68 if (var->bits_per_pixel <= 32 && var->red.length <= 8 && 69 var->green.length <= 8 && var->blue.length <= 8) { 70 if (var->bits_per_pixel == 24 && var->transp.length == 0) { 71 if (var->red.offset >= var->blue.offset) 72 return PIX_FMT_RGB888PACK; 73 else 74 return PIX_FMT_BGR888PACK; 75 } 76 77 if (var->bits_per_pixel == 32 && var->transp.length == 8) { 78 if (var->red.offset >= var->blue.offset) 79 return PIX_FMT_RGBA888; 80 else 81 return PIX_FMT_BGRA888; 82 } else { 83 if (var->red.offset >= var->blue.offset) 84 return PIX_FMT_RGB888UNPACK; 85 else 86 return PIX_FMT_BGR888UNPACK; 87 } 88 } 89 90 return -EINVAL; 91 } 92 93 static void set_pix_fmt(struct fb_var_screeninfo *var, int pix_fmt) 94 { 95 switch (pix_fmt) { 96 case PIX_FMT_RGB565: 97 var->bits_per_pixel = 16; 98 var->red.offset = 11; var->red.length = 5; 99 var->green.offset = 5; var->green.length = 6; 100 var->blue.offset = 0; var->blue.length = 5; 101 var->transp.offset = 0; var->transp.length = 0; 102 break; 103 case PIX_FMT_BGR565: 104 var->bits_per_pixel = 16; 105 var->red.offset = 0; var->red.length = 5; 106 var->green.offset = 5; var->green.length = 6; 107 var->blue.offset = 11; var->blue.length = 5; 108 var->transp.offset = 0; var->transp.length = 0; 109 break; 110 case PIX_FMT_RGB1555: 111 var->bits_per_pixel = 16; 112 var->red.offset = 10; var->red.length = 5; 113 var->green.offset = 5; var->green.length = 5; 114 var->blue.offset = 0; var->blue.length = 5; 115 var->transp.offset = 15; var->transp.length = 1; 116 break; 117 case PIX_FMT_BGR1555: 118 var->bits_per_pixel = 16; 119 var->red.offset = 0; var->red.length = 5; 120 var->green.offset = 5; var->green.length = 5; 121 var->blue.offset = 10; var->blue.length = 5; 122 var->transp.offset = 15; var->transp.length = 1; 123 break; 124 case PIX_FMT_RGB888PACK: 125 var->bits_per_pixel = 24; 126 var->red.offset = 16; var->red.length = 8; 127 var->green.offset = 8; var->green.length = 8; 128 var->blue.offset = 0; var->blue.length = 8; 129 var->transp.offset = 0; var->transp.length = 0; 130 break; 131 case PIX_FMT_BGR888PACK: 132 var->bits_per_pixel = 24; 133 var->red.offset = 0; var->red.length = 8; 134 var->green.offset = 8; var->green.length = 8; 135 var->blue.offset = 16; var->blue.length = 8; 136 var->transp.offset = 0; var->transp.length = 0; 137 break; 138 case PIX_FMT_RGBA888: 139 var->bits_per_pixel = 32; 140 var->red.offset = 16; var->red.length = 8; 141 var->green.offset = 8; var->green.length = 8; 142 var->blue.offset = 0; var->blue.length = 8; 143 var->transp.offset = 24; var->transp.length = 8; 144 break; 145 case PIX_FMT_BGRA888: 146 var->bits_per_pixel = 32; 147 var->red.offset = 0; var->red.length = 8; 148 var->green.offset = 8; var->green.length = 8; 149 var->blue.offset = 16; var->blue.length = 8; 150 var->transp.offset = 24; var->transp.length = 8; 151 break; 152 case PIX_FMT_PSEUDOCOLOR: 153 var->bits_per_pixel = 8; 154 var->red.offset = 0; var->red.length = 8; 155 var->green.offset = 0; var->green.length = 8; 156 var->blue.offset = 0; var->blue.length = 8; 157 var->transp.offset = 0; var->transp.length = 0; 158 break; 159 } 160 } 161 162 static void set_mode(struct pxa168fb_info *fbi, struct fb_var_screeninfo *var, 163 struct fb_videomode *mode, int pix_fmt, int ystretch) 164 { 165 struct fb_info *info = fbi->info; 166 167 set_pix_fmt(var, pix_fmt); 168 169 var->xres = mode->xres; 170 var->yres = mode->yres; 171 var->xres_virtual = max(var->xres, var->xres_virtual); 172 if (ystretch) 173 var->yres_virtual = info->fix.smem_len / 174 (var->xres_virtual * (var->bits_per_pixel >> 3)); 175 else 176 var->yres_virtual = max(var->yres, var->yres_virtual); 177 var->grayscale = 0; 178 var->accel_flags = FB_ACCEL_NONE; 179 var->pixclock = mode->pixclock; 180 var->left_margin = mode->left_margin; 181 var->right_margin = mode->right_margin; 182 var->upper_margin = mode->upper_margin; 183 var->lower_margin = mode->lower_margin; 184 var->hsync_len = mode->hsync_len; 185 var->vsync_len = mode->vsync_len; 186 var->sync = mode->sync; 187 var->vmode = FB_VMODE_NONINTERLACED; 188 var->rotate = FB_ROTATE_UR; 189 } 190 191 static int pxa168fb_check_var(struct fb_var_screeninfo *var, 192 struct fb_info *info) 193 { 194 struct pxa168fb_info *fbi = info->par; 195 int pix_fmt; 196 197 /* 198 * Determine which pixel format we're going to use. 199 */ 200 pix_fmt = determine_best_pix_fmt(var); 201 if (pix_fmt < 0) 202 return pix_fmt; 203 set_pix_fmt(var, pix_fmt); 204 fbi->pix_fmt = pix_fmt; 205 206 /* 207 * Basic geometry sanity checks. 208 */ 209 if (var->xoffset + var->xres > var->xres_virtual) 210 return -EINVAL; 211 if (var->yoffset + var->yres > var->yres_virtual) 212 return -EINVAL; 213 if (var->xres + var->right_margin + 214 var->hsync_len + var->left_margin > 2048) 215 return -EINVAL; 216 if (var->yres + var->lower_margin + 217 var->vsync_len + var->upper_margin > 2048) 218 return -EINVAL; 219 220 /* 221 * Check size of framebuffer. 222 */ 223 if (var->xres_virtual * var->yres_virtual * 224 (var->bits_per_pixel >> 3) > info->fix.smem_len) 225 return -EINVAL; 226 227 return 0; 228 } 229 230 /* 231 * The hardware clock divider has an integer and a fractional 232 * stage: 233 * 234 * clk2 = clk_in / integer_divider 235 * clk_out = clk2 * (1 - (fractional_divider >> 12)) 236 * 237 * Calculate integer and fractional divider for given clk_in 238 * and clk_out. 239 */ 240 static void set_clock_divider(struct pxa168fb_info *fbi, 241 const struct fb_videomode *m) 242 { 243 int divider_int; 244 int needed_pixclk; 245 u64 div_result; 246 u32 x = 0; 247 248 /* 249 * Notice: The field pixclock is used by linux fb 250 * is in pixel second. E.g. struct fb_videomode & 251 * struct fb_var_screeninfo 252 */ 253 254 /* 255 * Check input values. 256 */ 257 if (!m || !m->pixclock || !m->refresh) { 258 dev_err(fbi->dev, "Input refresh or pixclock is wrong.\n"); 259 return; 260 } 261 262 /* 263 * Using PLL/AXI clock. 264 */ 265 x = 0x80000000; 266 267 /* 268 * Calc divider according to refresh rate. 269 */ 270 div_result = 1000000000000ll; 271 do_div(div_result, m->pixclock); 272 needed_pixclk = (u32)div_result; 273 274 divider_int = clk_get_rate(fbi->clk) / needed_pixclk; 275 276 /* check whether divisor is too small. */ 277 if (divider_int < 2) { 278 dev_warn(fbi->dev, "Warning: clock source is too slow. " 279 "Try smaller resolution\n"); 280 divider_int = 2; 281 } 282 283 /* 284 * Set setting to reg. 285 */ 286 x |= divider_int; 287 writel(x, fbi->reg_base + LCD_CFG_SCLK_DIV); 288 } 289 290 static void set_dma_control0(struct pxa168fb_info *fbi) 291 { 292 u32 x; 293 294 /* 295 * Set bit to enable graphics DMA. 296 */ 297 x = readl(fbi->reg_base + LCD_SPU_DMA_CTRL0); 298 x &= ~CFG_GRA_ENA_MASK; 299 x |= fbi->active ? CFG_GRA_ENA(1) : CFG_GRA_ENA(0); 300 301 /* 302 * If we are in a pseudo-color mode, we need to enable 303 * palette lookup. 304 */ 305 if (fbi->pix_fmt == PIX_FMT_PSEUDOCOLOR) 306 x |= 0x10000000; 307 308 /* 309 * Configure hardware pixel format. 310 */ 311 x &= ~(0xF << 16); 312 x |= (fbi->pix_fmt >> 1) << 16; 313 314 /* 315 * Check red and blue pixel swap. 316 * 1. source data swap 317 * 2. panel output data swap 318 */ 319 x &= ~(1 << 12); 320 x |= ((fbi->pix_fmt & 1) ^ (fbi->panel_rbswap)) << 12; 321 322 writel(x, fbi->reg_base + LCD_SPU_DMA_CTRL0); 323 } 324 325 static void set_dma_control1(struct pxa168fb_info *fbi, int sync) 326 { 327 u32 x; 328 329 /* 330 * Configure default bits: vsync triggers DMA, gated clock 331 * enable, power save enable, configure alpha registers to 332 * display 100% graphics, and set pixel command. 333 */ 334 x = readl(fbi->reg_base + LCD_SPU_DMA_CTRL1); 335 x |= 0x2032ff81; 336 337 /* 338 * We trigger DMA on the falling edge of vsync if vsync is 339 * active low, or on the rising edge if vsync is active high. 340 */ 341 if (!(sync & FB_SYNC_VERT_HIGH_ACT)) 342 x |= 0x08000000; 343 344 writel(x, fbi->reg_base + LCD_SPU_DMA_CTRL1); 345 } 346 347 static void set_graphics_start(struct fb_info *info, int xoffset, int yoffset) 348 { 349 struct pxa168fb_info *fbi = info->par; 350 struct fb_var_screeninfo *var = &info->var; 351 int pixel_offset; 352 unsigned long addr; 353 354 pixel_offset = (yoffset * var->xres_virtual) + xoffset; 355 356 addr = fbi->fb_start_dma + (pixel_offset * (var->bits_per_pixel >> 3)); 357 writel(addr, fbi->reg_base + LCD_CFG_GRA_START_ADDR0); 358 } 359 360 static void set_dumb_panel_control(struct fb_info *info) 361 { 362 struct pxa168fb_info *fbi = info->par; 363 struct pxa168fb_mach_info *mi = dev_get_platdata(fbi->dev); 364 u32 x; 365 366 /* 367 * Preserve enable flag. 368 */ 369 x = readl(fbi->reg_base + LCD_SPU_DUMB_CTRL) & 0x00000001; 370 371 x |= (fbi->is_blanked ? 0x7 : mi->dumb_mode) << 28; 372 x |= mi->gpio_output_data << 20; 373 x |= mi->gpio_output_mask << 12; 374 x |= mi->panel_rgb_reverse_lanes ? 0x00000080 : 0; 375 x |= mi->invert_composite_blank ? 0x00000040 : 0; 376 x |= (info->var.sync & FB_SYNC_COMP_HIGH_ACT) ? 0x00000020 : 0; 377 x |= mi->invert_pix_val_ena ? 0x00000010 : 0; 378 x |= (info->var.sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : 0x00000008; 379 x |= (info->var.sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : 0x00000004; 380 x |= mi->invert_pixclock ? 0x00000002 : 0; 381 382 writel(x, fbi->reg_base + LCD_SPU_DUMB_CTRL); 383 } 384 385 static void set_dumb_screen_dimensions(struct fb_info *info) 386 { 387 struct pxa168fb_info *fbi = info->par; 388 struct fb_var_screeninfo *v = &info->var; 389 int x; 390 int y; 391 392 x = v->xres + v->right_margin + v->hsync_len + v->left_margin; 393 y = v->yres + v->lower_margin + v->vsync_len + v->upper_margin; 394 395 writel((y << 16) | x, fbi->reg_base + LCD_SPUT_V_H_TOTAL); 396 } 397 398 static int pxa168fb_set_par(struct fb_info *info) 399 { 400 struct pxa168fb_info *fbi = info->par; 401 struct fb_var_screeninfo *var = &info->var; 402 struct fb_videomode mode; 403 u32 x; 404 405 /* 406 * Set additional mode info. 407 */ 408 if (fbi->pix_fmt == PIX_FMT_PSEUDOCOLOR) 409 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 410 else 411 info->fix.visual = FB_VISUAL_TRUECOLOR; 412 info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8; 413 info->fix.ypanstep = var->yres; 414 415 /* 416 * Disable panel output while we setup the display. 417 */ 418 x = readl(fbi->reg_base + LCD_SPU_DUMB_CTRL); 419 writel(x & ~1, fbi->reg_base + LCD_SPU_DUMB_CTRL); 420 421 /* 422 * Configure global panel parameters. 423 */ 424 writel((var->yres << 16) | var->xres, 425 fbi->reg_base + LCD_SPU_V_H_ACTIVE); 426 427 /* 428 * convet var to video mode 429 */ 430 fb_var_to_videomode(&mode, &info->var); 431 432 /* Calculate clock divisor. */ 433 set_clock_divider(fbi, &mode); 434 435 /* Configure dma ctrl regs. */ 436 set_dma_control0(fbi); 437 set_dma_control1(fbi, info->var.sync); 438 439 /* 440 * Configure graphics DMA parameters. 441 */ 442 x = readl(fbi->reg_base + LCD_CFG_GRA_PITCH); 443 x = (x & ~0xFFFF) | ((var->xres_virtual * var->bits_per_pixel) >> 3); 444 writel(x, fbi->reg_base + LCD_CFG_GRA_PITCH); 445 writel((var->yres << 16) | var->xres, 446 fbi->reg_base + LCD_SPU_GRA_HPXL_VLN); 447 writel((var->yres << 16) | var->xres, 448 fbi->reg_base + LCD_SPU_GZM_HPXL_VLN); 449 450 /* 451 * Configure dumb panel ctrl regs & timings. 452 */ 453 set_dumb_panel_control(info); 454 set_dumb_screen_dimensions(info); 455 456 writel((var->left_margin << 16) | var->right_margin, 457 fbi->reg_base + LCD_SPU_H_PORCH); 458 writel((var->upper_margin << 16) | var->lower_margin, 459 fbi->reg_base + LCD_SPU_V_PORCH); 460 461 /* 462 * Re-enable panel output. 463 */ 464 x = readl(fbi->reg_base + LCD_SPU_DUMB_CTRL); 465 writel(x | 1, fbi->reg_base + LCD_SPU_DUMB_CTRL); 466 467 return 0; 468 } 469 470 static unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf) 471 { 472 return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset; 473 } 474 475 static u32 to_rgb(u16 red, u16 green, u16 blue) 476 { 477 red >>= 8; 478 green >>= 8; 479 blue >>= 8; 480 481 return (red << 16) | (green << 8) | blue; 482 } 483 484 static int 485 pxa168fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green, 486 unsigned int blue, unsigned int trans, struct fb_info *info) 487 { 488 struct pxa168fb_info *fbi = info->par; 489 u32 val; 490 491 if (info->var.grayscale) 492 red = green = blue = (19595 * red + 38470 * green + 493 7471 * blue) >> 16; 494 495 if (info->fix.visual == FB_VISUAL_TRUECOLOR && regno < 16) { 496 val = chan_to_field(red, &info->var.red); 497 val |= chan_to_field(green, &info->var.green); 498 val |= chan_to_field(blue , &info->var.blue); 499 fbi->pseudo_palette[regno] = val; 500 } 501 502 if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) { 503 val = to_rgb(red, green, blue); 504 writel(val, fbi->reg_base + LCD_SPU_SRAM_WRDAT); 505 writel(0x8300 | regno, fbi->reg_base + LCD_SPU_SRAM_CTRL); 506 } 507 508 return 0; 509 } 510 511 static int pxa168fb_blank(int blank, struct fb_info *info) 512 { 513 struct pxa168fb_info *fbi = info->par; 514 515 fbi->is_blanked = (blank == FB_BLANK_UNBLANK) ? 0 : 1; 516 set_dumb_panel_control(info); 517 518 return 0; 519 } 520 521 static int pxa168fb_pan_display(struct fb_var_screeninfo *var, 522 struct fb_info *info) 523 { 524 set_graphics_start(info, var->xoffset, var->yoffset); 525 526 return 0; 527 } 528 529 static irqreturn_t pxa168fb_handle_irq(int irq, void *dev_id) 530 { 531 struct pxa168fb_info *fbi = dev_id; 532 u32 isr = readl(fbi->reg_base + SPU_IRQ_ISR); 533 534 if ((isr & GRA_FRAME_IRQ0_ENA_MASK)) { 535 536 writel(isr & (~GRA_FRAME_IRQ0_ENA_MASK), 537 fbi->reg_base + SPU_IRQ_ISR); 538 539 return IRQ_HANDLED; 540 } 541 return IRQ_NONE; 542 } 543 544 static const struct fb_ops pxa168fb_ops = { 545 .owner = THIS_MODULE, 546 .fb_check_var = pxa168fb_check_var, 547 .fb_set_par = pxa168fb_set_par, 548 .fb_setcolreg = pxa168fb_setcolreg, 549 .fb_blank = pxa168fb_blank, 550 .fb_pan_display = pxa168fb_pan_display, 551 .fb_fillrect = cfb_fillrect, 552 .fb_copyarea = cfb_copyarea, 553 .fb_imageblit = cfb_imageblit, 554 }; 555 556 static void pxa168fb_init_mode(struct fb_info *info, 557 struct pxa168fb_mach_info *mi) 558 { 559 struct pxa168fb_info *fbi = info->par; 560 struct fb_var_screeninfo *var = &info->var; 561 u32 total_w, total_h, refresh; 562 u64 div_result; 563 const struct fb_videomode *m; 564 565 /* 566 * Set default value 567 */ 568 refresh = DEFAULT_REFRESH; 569 570 /* try to find best video mode. */ 571 m = fb_find_best_mode(&info->var, &info->modelist); 572 if (m) 573 fb_videomode_to_var(&info->var, m); 574 575 /* Init settings. */ 576 var->xres_virtual = var->xres; 577 var->yres_virtual = info->fix.smem_len / 578 (var->xres_virtual * (var->bits_per_pixel >> 3)); 579 dev_dbg(fbi->dev, "pxa168fb: find best mode: res = %dx%d\n", 580 var->xres, var->yres); 581 582 /* correct pixclock. */ 583 total_w = var->xres + var->left_margin + var->right_margin + 584 var->hsync_len; 585 total_h = var->yres + var->upper_margin + var->lower_margin + 586 var->vsync_len; 587 588 div_result = 1000000000000ll; 589 do_div(div_result, total_w * total_h * refresh); 590 var->pixclock = (u32)div_result; 591 } 592 593 static int pxa168fb_probe(struct platform_device *pdev) 594 { 595 struct pxa168fb_mach_info *mi; 596 struct fb_info *info = 0; 597 struct pxa168fb_info *fbi = 0; 598 struct resource *res; 599 struct clk *clk; 600 int irq, ret; 601 602 mi = dev_get_platdata(&pdev->dev); 603 if (mi == NULL) { 604 dev_err(&pdev->dev, "no platform data defined\n"); 605 return -EINVAL; 606 } 607 608 clk = devm_clk_get(&pdev->dev, "LCDCLK"); 609 if (IS_ERR(clk)) { 610 dev_err(&pdev->dev, "unable to get LCDCLK"); 611 return PTR_ERR(clk); 612 } 613 614 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 615 if (res == NULL) { 616 dev_err(&pdev->dev, "no IO memory defined\n"); 617 return -ENOENT; 618 } 619 620 irq = platform_get_irq(pdev, 0); 621 if (irq < 0) { 622 dev_err(&pdev->dev, "no IRQ defined\n"); 623 return -ENOENT; 624 } 625 626 info = framebuffer_alloc(sizeof(struct pxa168fb_info), &pdev->dev); 627 if (info == NULL) { 628 return -ENOMEM; 629 } 630 631 /* Initialize private data */ 632 fbi = info->par; 633 fbi->info = info; 634 fbi->clk = clk; 635 fbi->dev = info->dev = &pdev->dev; 636 fbi->panel_rbswap = mi->panel_rbswap; 637 fbi->is_blanked = 0; 638 fbi->active = mi->active; 639 640 /* 641 * Initialise static fb parameters. 642 */ 643 info->flags = FBINFO_DEFAULT | FBINFO_PARTIAL_PAN_OK | 644 FBINFO_HWACCEL_XPAN | FBINFO_HWACCEL_YPAN; 645 info->node = -1; 646 strlcpy(info->fix.id, mi->id, 16); 647 info->fix.type = FB_TYPE_PACKED_PIXELS; 648 info->fix.type_aux = 0; 649 info->fix.xpanstep = 0; 650 info->fix.ypanstep = 0; 651 info->fix.ywrapstep = 0; 652 info->fix.mmio_start = res->start; 653 info->fix.mmio_len = resource_size(res); 654 info->fix.accel = FB_ACCEL_NONE; 655 info->fbops = &pxa168fb_ops; 656 info->pseudo_palette = fbi->pseudo_palette; 657 658 /* 659 * Map LCD controller registers. 660 */ 661 fbi->reg_base = devm_ioremap(&pdev->dev, res->start, 662 resource_size(res)); 663 if (fbi->reg_base == NULL) { 664 ret = -ENOMEM; 665 goto failed_free_info; 666 } 667 668 /* 669 * Allocate framebuffer memory. 670 */ 671 info->fix.smem_len = PAGE_ALIGN(DEFAULT_FB_SIZE); 672 673 info->screen_base = dma_alloc_wc(fbi->dev, info->fix.smem_len, 674 &fbi->fb_start_dma, GFP_KERNEL); 675 if (info->screen_base == NULL) { 676 ret = -ENOMEM; 677 goto failed_free_info; 678 } 679 680 info->fix.smem_start = (unsigned long)fbi->fb_start_dma; 681 set_graphics_start(info, 0, 0); 682 683 /* 684 * Set video mode according to platform data. 685 */ 686 set_mode(fbi, &info->var, mi->modes, mi->pix_fmt, 1); 687 688 fb_videomode_to_modelist(mi->modes, mi->num_modes, &info->modelist); 689 690 /* 691 * init video mode data. 692 */ 693 pxa168fb_init_mode(info, mi); 694 695 /* 696 * Fill in sane defaults. 697 */ 698 ret = pxa168fb_check_var(&info->var, info); 699 if (ret) 700 goto failed_free_fbmem; 701 702 /* 703 * enable controller clock 704 */ 705 clk_prepare_enable(fbi->clk); 706 707 pxa168fb_set_par(info); 708 709 /* 710 * Configure default register values. 711 */ 712 writel(0, fbi->reg_base + LCD_SPU_BLANKCOLOR); 713 writel(mi->io_pin_allocation_mode, fbi->reg_base + SPU_IOPAD_CONTROL); 714 writel(0, fbi->reg_base + LCD_CFG_GRA_START_ADDR1); 715 writel(0, fbi->reg_base + LCD_SPU_GRA_OVSA_HPXL_VLN); 716 writel(0, fbi->reg_base + LCD_SPU_SRAM_PARA0); 717 writel(CFG_CSB_256x32(0x1)|CFG_CSB_256x24(0x1)|CFG_CSB_256x8(0x1), 718 fbi->reg_base + LCD_SPU_SRAM_PARA1); 719 720 /* 721 * Allocate color map. 722 */ 723 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { 724 ret = -ENOMEM; 725 goto failed_free_clk; 726 } 727 728 /* 729 * Register irq handler. 730 */ 731 ret = devm_request_irq(&pdev->dev, irq, pxa168fb_handle_irq, 732 IRQF_SHARED, info->fix.id, fbi); 733 if (ret < 0) { 734 dev_err(&pdev->dev, "unable to request IRQ\n"); 735 ret = -ENXIO; 736 goto failed_free_cmap; 737 } 738 739 /* 740 * Enable GFX interrupt 741 */ 742 writel(GRA_FRAME_IRQ0_ENA(0x1), fbi->reg_base + SPU_IRQ_ENA); 743 744 /* 745 * Register framebuffer. 746 */ 747 ret = register_framebuffer(info); 748 if (ret < 0) { 749 dev_err(&pdev->dev, "Failed to register pxa168-fb: %d\n", ret); 750 ret = -ENXIO; 751 goto failed_free_cmap; 752 } 753 754 platform_set_drvdata(pdev, fbi); 755 return 0; 756 757 failed_free_cmap: 758 fb_dealloc_cmap(&info->cmap); 759 failed_free_clk: 760 clk_disable_unprepare(fbi->clk); 761 failed_free_fbmem: 762 dma_free_wc(fbi->dev, info->fix.smem_len, 763 info->screen_base, fbi->fb_start_dma); 764 failed_free_info: 765 framebuffer_release(info); 766 767 dev_err(&pdev->dev, "frame buffer device init failed with %d\n", ret); 768 return ret; 769 } 770 771 static int pxa168fb_remove(struct platform_device *pdev) 772 { 773 struct pxa168fb_info *fbi = platform_get_drvdata(pdev); 774 struct fb_info *info; 775 unsigned int data; 776 777 if (!fbi) 778 return 0; 779 780 /* disable DMA transfer */ 781 data = readl(fbi->reg_base + LCD_SPU_DMA_CTRL0); 782 data &= ~CFG_GRA_ENA_MASK; 783 writel(data, fbi->reg_base + LCD_SPU_DMA_CTRL0); 784 785 info = fbi->info; 786 787 unregister_framebuffer(info); 788 789 writel(GRA_FRAME_IRQ0_ENA(0x0), fbi->reg_base + SPU_IRQ_ENA); 790 791 if (info->cmap.len) 792 fb_dealloc_cmap(&info->cmap); 793 794 dma_free_wc(fbi->dev, info->fix.smem_len, 795 info->screen_base, info->fix.smem_start); 796 797 clk_disable_unprepare(fbi->clk); 798 799 framebuffer_release(info); 800 801 return 0; 802 } 803 804 static struct platform_driver pxa168fb_driver = { 805 .driver = { 806 .name = "pxa168-fb", 807 }, 808 .probe = pxa168fb_probe, 809 .remove = pxa168fb_remove, 810 }; 811 812 module_platform_driver(pxa168fb_driver); 813 814 MODULE_AUTHOR("Lennert Buytenhek <buytenh@marvell.com> " 815 "Green Wan <gwan@marvell.com>"); 816 MODULE_DESCRIPTION("Framebuffer driver for PXA168/910"); 817 MODULE_LICENSE("GPL"); 818