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 /* fall through */ 65 } 66 67 /* 68 * Check for 888/A888. 69 */ 70 if (var->bits_per_pixel <= 32 && var->red.length <= 8 && 71 var->green.length <= 8 && var->blue.length <= 8) { 72 if (var->bits_per_pixel == 24 && var->transp.length == 0) { 73 if (var->red.offset >= var->blue.offset) 74 return PIX_FMT_RGB888PACK; 75 else 76 return PIX_FMT_BGR888PACK; 77 } 78 79 if (var->bits_per_pixel == 32 && var->transp.length == 8) { 80 if (var->red.offset >= var->blue.offset) 81 return PIX_FMT_RGBA888; 82 else 83 return PIX_FMT_BGRA888; 84 } else { 85 if (var->red.offset >= var->blue.offset) 86 return PIX_FMT_RGB888UNPACK; 87 else 88 return PIX_FMT_BGR888UNPACK; 89 } 90 91 /* fall through */ 92 } 93 94 return -EINVAL; 95 } 96 97 static void set_pix_fmt(struct fb_var_screeninfo *var, int pix_fmt) 98 { 99 switch (pix_fmt) { 100 case PIX_FMT_RGB565: 101 var->bits_per_pixel = 16; 102 var->red.offset = 11; var->red.length = 5; 103 var->green.offset = 5; var->green.length = 6; 104 var->blue.offset = 0; var->blue.length = 5; 105 var->transp.offset = 0; var->transp.length = 0; 106 break; 107 case PIX_FMT_BGR565: 108 var->bits_per_pixel = 16; 109 var->red.offset = 0; var->red.length = 5; 110 var->green.offset = 5; var->green.length = 6; 111 var->blue.offset = 11; var->blue.length = 5; 112 var->transp.offset = 0; var->transp.length = 0; 113 break; 114 case PIX_FMT_RGB1555: 115 var->bits_per_pixel = 16; 116 var->red.offset = 10; var->red.length = 5; 117 var->green.offset = 5; var->green.length = 5; 118 var->blue.offset = 0; var->blue.length = 5; 119 var->transp.offset = 15; var->transp.length = 1; 120 break; 121 case PIX_FMT_BGR1555: 122 var->bits_per_pixel = 16; 123 var->red.offset = 0; var->red.length = 5; 124 var->green.offset = 5; var->green.length = 5; 125 var->blue.offset = 10; var->blue.length = 5; 126 var->transp.offset = 15; var->transp.length = 1; 127 break; 128 case PIX_FMT_RGB888PACK: 129 var->bits_per_pixel = 24; 130 var->red.offset = 16; var->red.length = 8; 131 var->green.offset = 8; var->green.length = 8; 132 var->blue.offset = 0; var->blue.length = 8; 133 var->transp.offset = 0; var->transp.length = 0; 134 break; 135 case PIX_FMT_BGR888PACK: 136 var->bits_per_pixel = 24; 137 var->red.offset = 0; var->red.length = 8; 138 var->green.offset = 8; var->green.length = 8; 139 var->blue.offset = 16; var->blue.length = 8; 140 var->transp.offset = 0; var->transp.length = 0; 141 break; 142 case PIX_FMT_RGBA888: 143 var->bits_per_pixel = 32; 144 var->red.offset = 16; var->red.length = 8; 145 var->green.offset = 8; var->green.length = 8; 146 var->blue.offset = 0; var->blue.length = 8; 147 var->transp.offset = 24; var->transp.length = 8; 148 break; 149 case PIX_FMT_BGRA888: 150 var->bits_per_pixel = 32; 151 var->red.offset = 0; var->red.length = 8; 152 var->green.offset = 8; var->green.length = 8; 153 var->blue.offset = 16; var->blue.length = 8; 154 var->transp.offset = 24; var->transp.length = 8; 155 break; 156 case PIX_FMT_PSEUDOCOLOR: 157 var->bits_per_pixel = 8; 158 var->red.offset = 0; var->red.length = 8; 159 var->green.offset = 0; var->green.length = 8; 160 var->blue.offset = 0; var->blue.length = 8; 161 var->transp.offset = 0; var->transp.length = 0; 162 break; 163 } 164 } 165 166 static void set_mode(struct pxa168fb_info *fbi, struct fb_var_screeninfo *var, 167 struct fb_videomode *mode, int pix_fmt, int ystretch) 168 { 169 struct fb_info *info = fbi->info; 170 171 set_pix_fmt(var, pix_fmt); 172 173 var->xres = mode->xres; 174 var->yres = mode->yres; 175 var->xres_virtual = max(var->xres, var->xres_virtual); 176 if (ystretch) 177 var->yres_virtual = info->fix.smem_len / 178 (var->xres_virtual * (var->bits_per_pixel >> 3)); 179 else 180 var->yres_virtual = max(var->yres, var->yres_virtual); 181 var->grayscale = 0; 182 var->accel_flags = FB_ACCEL_NONE; 183 var->pixclock = mode->pixclock; 184 var->left_margin = mode->left_margin; 185 var->right_margin = mode->right_margin; 186 var->upper_margin = mode->upper_margin; 187 var->lower_margin = mode->lower_margin; 188 var->hsync_len = mode->hsync_len; 189 var->vsync_len = mode->vsync_len; 190 var->sync = mode->sync; 191 var->vmode = FB_VMODE_NONINTERLACED; 192 var->rotate = FB_ROTATE_UR; 193 } 194 195 static int pxa168fb_check_var(struct fb_var_screeninfo *var, 196 struct fb_info *info) 197 { 198 struct pxa168fb_info *fbi = info->par; 199 int pix_fmt; 200 201 /* 202 * Determine which pixel format we're going to use. 203 */ 204 pix_fmt = determine_best_pix_fmt(var); 205 if (pix_fmt < 0) 206 return pix_fmt; 207 set_pix_fmt(var, pix_fmt); 208 fbi->pix_fmt = pix_fmt; 209 210 /* 211 * Basic geometry sanity checks. 212 */ 213 if (var->xoffset + var->xres > var->xres_virtual) 214 return -EINVAL; 215 if (var->yoffset + var->yres > var->yres_virtual) 216 return -EINVAL; 217 if (var->xres + var->right_margin + 218 var->hsync_len + var->left_margin > 2048) 219 return -EINVAL; 220 if (var->yres + var->lower_margin + 221 var->vsync_len + var->upper_margin > 2048) 222 return -EINVAL; 223 224 /* 225 * Check size of framebuffer. 226 */ 227 if (var->xres_virtual * var->yres_virtual * 228 (var->bits_per_pixel >> 3) > info->fix.smem_len) 229 return -EINVAL; 230 231 return 0; 232 } 233 234 /* 235 * The hardware clock divider has an integer and a fractional 236 * stage: 237 * 238 * clk2 = clk_in / integer_divider 239 * clk_out = clk2 * (1 - (fractional_divider >> 12)) 240 * 241 * Calculate integer and fractional divider for given clk_in 242 * and clk_out. 243 */ 244 static void set_clock_divider(struct pxa168fb_info *fbi, 245 const struct fb_videomode *m) 246 { 247 int divider_int; 248 int needed_pixclk; 249 u64 div_result; 250 u32 x = 0; 251 252 /* 253 * Notice: The field pixclock is used by linux fb 254 * is in pixel second. E.g. struct fb_videomode & 255 * struct fb_var_screeninfo 256 */ 257 258 /* 259 * Check input values. 260 */ 261 if (!m || !m->pixclock || !m->refresh) { 262 dev_err(fbi->dev, "Input refresh or pixclock is wrong.\n"); 263 return; 264 } 265 266 /* 267 * Using PLL/AXI clock. 268 */ 269 x = 0x80000000; 270 271 /* 272 * Calc divider according to refresh rate. 273 */ 274 div_result = 1000000000000ll; 275 do_div(div_result, m->pixclock); 276 needed_pixclk = (u32)div_result; 277 278 divider_int = clk_get_rate(fbi->clk) / needed_pixclk; 279 280 /* check whether divisor is too small. */ 281 if (divider_int < 2) { 282 dev_warn(fbi->dev, "Warning: clock source is too slow. " 283 "Try smaller resolution\n"); 284 divider_int = 2; 285 } 286 287 /* 288 * Set setting to reg. 289 */ 290 x |= divider_int; 291 writel(x, fbi->reg_base + LCD_CFG_SCLK_DIV); 292 } 293 294 static void set_dma_control0(struct pxa168fb_info *fbi) 295 { 296 u32 x; 297 298 /* 299 * Set bit to enable graphics DMA. 300 */ 301 x = readl(fbi->reg_base + LCD_SPU_DMA_CTRL0); 302 x &= ~CFG_GRA_ENA_MASK; 303 x |= fbi->active ? CFG_GRA_ENA(1) : CFG_GRA_ENA(0); 304 305 /* 306 * If we are in a pseudo-color mode, we need to enable 307 * palette lookup. 308 */ 309 if (fbi->pix_fmt == PIX_FMT_PSEUDOCOLOR) 310 x |= 0x10000000; 311 312 /* 313 * Configure hardware pixel format. 314 */ 315 x &= ~(0xF << 16); 316 x |= (fbi->pix_fmt >> 1) << 16; 317 318 /* 319 * Check red and blue pixel swap. 320 * 1. source data swap 321 * 2. panel output data swap 322 */ 323 x &= ~(1 << 12); 324 x |= ((fbi->pix_fmt & 1) ^ (fbi->panel_rbswap)) << 12; 325 326 writel(x, fbi->reg_base + LCD_SPU_DMA_CTRL0); 327 } 328 329 static void set_dma_control1(struct pxa168fb_info *fbi, int sync) 330 { 331 u32 x; 332 333 /* 334 * Configure default bits: vsync triggers DMA, gated clock 335 * enable, power save enable, configure alpha registers to 336 * display 100% graphics, and set pixel command. 337 */ 338 x = readl(fbi->reg_base + LCD_SPU_DMA_CTRL1); 339 x |= 0x2032ff81; 340 341 /* 342 * We trigger DMA on the falling edge of vsync if vsync is 343 * active low, or on the rising edge if vsync is active high. 344 */ 345 if (!(sync & FB_SYNC_VERT_HIGH_ACT)) 346 x |= 0x08000000; 347 348 writel(x, fbi->reg_base + LCD_SPU_DMA_CTRL1); 349 } 350 351 static void set_graphics_start(struct fb_info *info, int xoffset, int yoffset) 352 { 353 struct pxa168fb_info *fbi = info->par; 354 struct fb_var_screeninfo *var = &info->var; 355 int pixel_offset; 356 unsigned long addr; 357 358 pixel_offset = (yoffset * var->xres_virtual) + xoffset; 359 360 addr = fbi->fb_start_dma + (pixel_offset * (var->bits_per_pixel >> 3)); 361 writel(addr, fbi->reg_base + LCD_CFG_GRA_START_ADDR0); 362 } 363 364 static void set_dumb_panel_control(struct fb_info *info) 365 { 366 struct pxa168fb_info *fbi = info->par; 367 struct pxa168fb_mach_info *mi = dev_get_platdata(fbi->dev); 368 u32 x; 369 370 /* 371 * Preserve enable flag. 372 */ 373 x = readl(fbi->reg_base + LCD_SPU_DUMB_CTRL) & 0x00000001; 374 375 x |= (fbi->is_blanked ? 0x7 : mi->dumb_mode) << 28; 376 x |= mi->gpio_output_data << 20; 377 x |= mi->gpio_output_mask << 12; 378 x |= mi->panel_rgb_reverse_lanes ? 0x00000080 : 0; 379 x |= mi->invert_composite_blank ? 0x00000040 : 0; 380 x |= (info->var.sync & FB_SYNC_COMP_HIGH_ACT) ? 0x00000020 : 0; 381 x |= mi->invert_pix_val_ena ? 0x00000010 : 0; 382 x |= (info->var.sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : 0x00000008; 383 x |= (info->var.sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : 0x00000004; 384 x |= mi->invert_pixclock ? 0x00000002 : 0; 385 386 writel(x, fbi->reg_base + LCD_SPU_DUMB_CTRL); 387 } 388 389 static void set_dumb_screen_dimensions(struct fb_info *info) 390 { 391 struct pxa168fb_info *fbi = info->par; 392 struct fb_var_screeninfo *v = &info->var; 393 int x; 394 int y; 395 396 x = v->xres + v->right_margin + v->hsync_len + v->left_margin; 397 y = v->yres + v->lower_margin + v->vsync_len + v->upper_margin; 398 399 writel((y << 16) | x, fbi->reg_base + LCD_SPUT_V_H_TOTAL); 400 } 401 402 static int pxa168fb_set_par(struct fb_info *info) 403 { 404 struct pxa168fb_info *fbi = info->par; 405 struct fb_var_screeninfo *var = &info->var; 406 struct fb_videomode mode; 407 u32 x; 408 409 /* 410 * Set additional mode info. 411 */ 412 if (fbi->pix_fmt == PIX_FMT_PSEUDOCOLOR) 413 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 414 else 415 info->fix.visual = FB_VISUAL_TRUECOLOR; 416 info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8; 417 info->fix.ypanstep = var->yres; 418 419 /* 420 * Disable panel output while we setup the display. 421 */ 422 x = readl(fbi->reg_base + LCD_SPU_DUMB_CTRL); 423 writel(x & ~1, fbi->reg_base + LCD_SPU_DUMB_CTRL); 424 425 /* 426 * Configure global panel parameters. 427 */ 428 writel((var->yres << 16) | var->xres, 429 fbi->reg_base + LCD_SPU_V_H_ACTIVE); 430 431 /* 432 * convet var to video mode 433 */ 434 fb_var_to_videomode(&mode, &info->var); 435 436 /* Calculate clock divisor. */ 437 set_clock_divider(fbi, &mode); 438 439 /* Configure dma ctrl regs. */ 440 set_dma_control0(fbi); 441 set_dma_control1(fbi, info->var.sync); 442 443 /* 444 * Configure graphics DMA parameters. 445 */ 446 x = readl(fbi->reg_base + LCD_CFG_GRA_PITCH); 447 x = (x & ~0xFFFF) | ((var->xres_virtual * var->bits_per_pixel) >> 3); 448 writel(x, fbi->reg_base + LCD_CFG_GRA_PITCH); 449 writel((var->yres << 16) | var->xres, 450 fbi->reg_base + LCD_SPU_GRA_HPXL_VLN); 451 writel((var->yres << 16) | var->xres, 452 fbi->reg_base + LCD_SPU_GZM_HPXL_VLN); 453 454 /* 455 * Configure dumb panel ctrl regs & timings. 456 */ 457 set_dumb_panel_control(info); 458 set_dumb_screen_dimensions(info); 459 460 writel((var->left_margin << 16) | var->right_margin, 461 fbi->reg_base + LCD_SPU_H_PORCH); 462 writel((var->upper_margin << 16) | var->lower_margin, 463 fbi->reg_base + LCD_SPU_V_PORCH); 464 465 /* 466 * Re-enable panel output. 467 */ 468 x = readl(fbi->reg_base + LCD_SPU_DUMB_CTRL); 469 writel(x | 1, fbi->reg_base + LCD_SPU_DUMB_CTRL); 470 471 return 0; 472 } 473 474 static unsigned int chan_to_field(unsigned int chan, struct fb_bitfield *bf) 475 { 476 return ((chan & 0xffff) >> (16 - bf->length)) << bf->offset; 477 } 478 479 static u32 to_rgb(u16 red, u16 green, u16 blue) 480 { 481 red >>= 8; 482 green >>= 8; 483 blue >>= 8; 484 485 return (red << 16) | (green << 8) | blue; 486 } 487 488 static int 489 pxa168fb_setcolreg(unsigned int regno, unsigned int red, unsigned int green, 490 unsigned int blue, unsigned int trans, struct fb_info *info) 491 { 492 struct pxa168fb_info *fbi = info->par; 493 u32 val; 494 495 if (info->var.grayscale) 496 red = green = blue = (19595 * red + 38470 * green + 497 7471 * blue) >> 16; 498 499 if (info->fix.visual == FB_VISUAL_TRUECOLOR && regno < 16) { 500 val = chan_to_field(red, &info->var.red); 501 val |= chan_to_field(green, &info->var.green); 502 val |= chan_to_field(blue , &info->var.blue); 503 fbi->pseudo_palette[regno] = val; 504 } 505 506 if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) { 507 val = to_rgb(red, green, blue); 508 writel(val, fbi->reg_base + LCD_SPU_SRAM_WRDAT); 509 writel(0x8300 | regno, fbi->reg_base + LCD_SPU_SRAM_CTRL); 510 } 511 512 return 0; 513 } 514 515 static int pxa168fb_blank(int blank, struct fb_info *info) 516 { 517 struct pxa168fb_info *fbi = info->par; 518 519 fbi->is_blanked = (blank == FB_BLANK_UNBLANK) ? 0 : 1; 520 set_dumb_panel_control(info); 521 522 return 0; 523 } 524 525 static int pxa168fb_pan_display(struct fb_var_screeninfo *var, 526 struct fb_info *info) 527 { 528 set_graphics_start(info, var->xoffset, var->yoffset); 529 530 return 0; 531 } 532 533 static irqreturn_t pxa168fb_handle_irq(int irq, void *dev_id) 534 { 535 struct pxa168fb_info *fbi = dev_id; 536 u32 isr = readl(fbi->reg_base + SPU_IRQ_ISR); 537 538 if ((isr & GRA_FRAME_IRQ0_ENA_MASK)) { 539 540 writel(isr & (~GRA_FRAME_IRQ0_ENA_MASK), 541 fbi->reg_base + SPU_IRQ_ISR); 542 543 return IRQ_HANDLED; 544 } 545 return IRQ_NONE; 546 } 547 548 static struct fb_ops pxa168fb_ops = { 549 .owner = THIS_MODULE, 550 .fb_check_var = pxa168fb_check_var, 551 .fb_set_par = pxa168fb_set_par, 552 .fb_setcolreg = pxa168fb_setcolreg, 553 .fb_blank = pxa168fb_blank, 554 .fb_pan_display = pxa168fb_pan_display, 555 .fb_fillrect = cfb_fillrect, 556 .fb_copyarea = cfb_copyarea, 557 .fb_imageblit = cfb_imageblit, 558 }; 559 560 static int pxa168fb_init_mode(struct fb_info *info, 561 struct pxa168fb_mach_info *mi) 562 { 563 struct pxa168fb_info *fbi = info->par; 564 struct fb_var_screeninfo *var = &info->var; 565 int ret = 0; 566 u32 total_w, total_h, refresh; 567 u64 div_result; 568 const struct fb_videomode *m; 569 570 /* 571 * Set default value 572 */ 573 refresh = DEFAULT_REFRESH; 574 575 /* try to find best video mode. */ 576 m = fb_find_best_mode(&info->var, &info->modelist); 577 if (m) 578 fb_videomode_to_var(&info->var, m); 579 580 /* Init settings. */ 581 var->xres_virtual = var->xres; 582 var->yres_virtual = info->fix.smem_len / 583 (var->xres_virtual * (var->bits_per_pixel >> 3)); 584 dev_dbg(fbi->dev, "pxa168fb: find best mode: res = %dx%d\n", 585 var->xres, var->yres); 586 587 /* correct pixclock. */ 588 total_w = var->xres + var->left_margin + var->right_margin + 589 var->hsync_len; 590 total_h = var->yres + var->upper_margin + var->lower_margin + 591 var->vsync_len; 592 593 div_result = 1000000000000ll; 594 do_div(div_result, total_w * total_h * refresh); 595 var->pixclock = (u32)div_result; 596 597 return ret; 598 } 599 600 static int pxa168fb_probe(struct platform_device *pdev) 601 { 602 struct pxa168fb_mach_info *mi; 603 struct fb_info *info = 0; 604 struct pxa168fb_info *fbi = 0; 605 struct resource *res; 606 struct clk *clk; 607 int irq, ret; 608 609 mi = dev_get_platdata(&pdev->dev); 610 if (mi == NULL) { 611 dev_err(&pdev->dev, "no platform data defined\n"); 612 return -EINVAL; 613 } 614 615 clk = devm_clk_get(&pdev->dev, "LCDCLK"); 616 if (IS_ERR(clk)) { 617 dev_err(&pdev->dev, "unable to get LCDCLK"); 618 return PTR_ERR(clk); 619 } 620 621 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 622 if (res == NULL) { 623 dev_err(&pdev->dev, "no IO memory defined\n"); 624 return -ENOENT; 625 } 626 627 irq = platform_get_irq(pdev, 0); 628 if (irq < 0) { 629 dev_err(&pdev->dev, "no IRQ defined\n"); 630 return -ENOENT; 631 } 632 633 info = framebuffer_alloc(sizeof(struct pxa168fb_info), &pdev->dev); 634 if (info == NULL) { 635 return -ENOMEM; 636 } 637 638 /* Initialize private data */ 639 fbi = info->par; 640 fbi->info = info; 641 fbi->clk = clk; 642 fbi->dev = info->dev = &pdev->dev; 643 fbi->panel_rbswap = mi->panel_rbswap; 644 fbi->is_blanked = 0; 645 fbi->active = mi->active; 646 647 /* 648 * Initialise static fb parameters. 649 */ 650 info->flags = FBINFO_DEFAULT | FBINFO_PARTIAL_PAN_OK | 651 FBINFO_HWACCEL_XPAN | FBINFO_HWACCEL_YPAN; 652 info->node = -1; 653 strlcpy(info->fix.id, mi->id, 16); 654 info->fix.type = FB_TYPE_PACKED_PIXELS; 655 info->fix.type_aux = 0; 656 info->fix.xpanstep = 0; 657 info->fix.ypanstep = 0; 658 info->fix.ywrapstep = 0; 659 info->fix.mmio_start = res->start; 660 info->fix.mmio_len = resource_size(res); 661 info->fix.accel = FB_ACCEL_NONE; 662 info->fbops = &pxa168fb_ops; 663 info->pseudo_palette = fbi->pseudo_palette; 664 665 /* 666 * Map LCD controller registers. 667 */ 668 fbi->reg_base = devm_ioremap_nocache(&pdev->dev, res->start, 669 resource_size(res)); 670 if (fbi->reg_base == NULL) { 671 ret = -ENOMEM; 672 goto failed_free_info; 673 } 674 675 /* 676 * Allocate framebuffer memory. 677 */ 678 info->fix.smem_len = PAGE_ALIGN(DEFAULT_FB_SIZE); 679 680 info->screen_base = dma_alloc_wc(fbi->dev, info->fix.smem_len, 681 &fbi->fb_start_dma, GFP_KERNEL); 682 if (info->screen_base == NULL) { 683 ret = -ENOMEM; 684 goto failed_free_info; 685 } 686 687 info->fix.smem_start = (unsigned long)fbi->fb_start_dma; 688 set_graphics_start(info, 0, 0); 689 690 /* 691 * Set video mode according to platform data. 692 */ 693 set_mode(fbi, &info->var, mi->modes, mi->pix_fmt, 1); 694 695 fb_videomode_to_modelist(mi->modes, mi->num_modes, &info->modelist); 696 697 /* 698 * init video mode data. 699 */ 700 pxa168fb_init_mode(info, mi); 701 702 /* 703 * Fill in sane defaults. 704 */ 705 ret = pxa168fb_check_var(&info->var, info); 706 if (ret) 707 goto failed_free_fbmem; 708 709 /* 710 * enable controller clock 711 */ 712 clk_prepare_enable(fbi->clk); 713 714 pxa168fb_set_par(info); 715 716 /* 717 * Configure default register values. 718 */ 719 writel(0, fbi->reg_base + LCD_SPU_BLANKCOLOR); 720 writel(mi->io_pin_allocation_mode, fbi->reg_base + SPU_IOPAD_CONTROL); 721 writel(0, fbi->reg_base + LCD_CFG_GRA_START_ADDR1); 722 writel(0, fbi->reg_base + LCD_SPU_GRA_OVSA_HPXL_VLN); 723 writel(0, fbi->reg_base + LCD_SPU_SRAM_PARA0); 724 writel(CFG_CSB_256x32(0x1)|CFG_CSB_256x24(0x1)|CFG_CSB_256x8(0x1), 725 fbi->reg_base + LCD_SPU_SRAM_PARA1); 726 727 /* 728 * Allocate color map. 729 */ 730 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { 731 ret = -ENOMEM; 732 goto failed_free_clk; 733 } 734 735 /* 736 * Register irq handler. 737 */ 738 ret = devm_request_irq(&pdev->dev, irq, pxa168fb_handle_irq, 739 IRQF_SHARED, info->fix.id, fbi); 740 if (ret < 0) { 741 dev_err(&pdev->dev, "unable to request IRQ\n"); 742 ret = -ENXIO; 743 goto failed_free_cmap; 744 } 745 746 /* 747 * Enable GFX interrupt 748 */ 749 writel(GRA_FRAME_IRQ0_ENA(0x1), fbi->reg_base + SPU_IRQ_ENA); 750 751 /* 752 * Register framebuffer. 753 */ 754 ret = register_framebuffer(info); 755 if (ret < 0) { 756 dev_err(&pdev->dev, "Failed to register pxa168-fb: %d\n", ret); 757 ret = -ENXIO; 758 goto failed_free_cmap; 759 } 760 761 platform_set_drvdata(pdev, fbi); 762 return 0; 763 764 failed_free_cmap: 765 fb_dealloc_cmap(&info->cmap); 766 failed_free_clk: 767 clk_disable_unprepare(fbi->clk); 768 failed_free_fbmem: 769 dma_free_coherent(fbi->dev, info->fix.smem_len, 770 info->screen_base, fbi->fb_start_dma); 771 failed_free_info: 772 kfree(info); 773 774 dev_err(&pdev->dev, "frame buffer device init failed with %d\n", ret); 775 return ret; 776 } 777 778 static int pxa168fb_remove(struct platform_device *pdev) 779 { 780 struct pxa168fb_info *fbi = platform_get_drvdata(pdev); 781 struct fb_info *info; 782 int irq; 783 unsigned int data; 784 785 if (!fbi) 786 return 0; 787 788 /* disable DMA transfer */ 789 data = readl(fbi->reg_base + LCD_SPU_DMA_CTRL0); 790 data &= ~CFG_GRA_ENA_MASK; 791 writel(data, fbi->reg_base + LCD_SPU_DMA_CTRL0); 792 793 info = fbi->info; 794 795 unregister_framebuffer(info); 796 797 writel(GRA_FRAME_IRQ0_ENA(0x0), fbi->reg_base + SPU_IRQ_ENA); 798 799 if (info->cmap.len) 800 fb_dealloc_cmap(&info->cmap); 801 802 irq = platform_get_irq(pdev, 0); 803 804 dma_free_wc(fbi->dev, PAGE_ALIGN(info->fix.smem_len), 805 info->screen_base, info->fix.smem_start); 806 807 clk_disable_unprepare(fbi->clk); 808 809 framebuffer_release(info); 810 811 return 0; 812 } 813 814 static struct platform_driver pxa168fb_driver = { 815 .driver = { 816 .name = "pxa168-fb", 817 }, 818 .probe = pxa168fb_probe, 819 .remove = pxa168fb_remove, 820 }; 821 822 module_platform_driver(pxa168fb_driver); 823 824 MODULE_AUTHOR("Lennert Buytenhek <buytenh@marvell.com> " 825 "Green Wan <gwan@marvell.com>"); 826 MODULE_DESCRIPTION("Framebuffer driver for PXA168/910"); 827 MODULE_LICENSE("GPL"); 828