1 /* 2 * Driver for AT91/AT32 LCD Controller 3 * 4 * Copyright (C) 2007 Atmel Corporation 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file COPYING in the main directory of this archive for 8 * more details. 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/platform_device.h> 13 #include <linux/dma-mapping.h> 14 #include <linux/interrupt.h> 15 #include <linux/clk.h> 16 #include <linux/fb.h> 17 #include <linux/init.h> 18 #include <linux/delay.h> 19 #include <linux/backlight.h> 20 #include <linux/gfp.h> 21 #include <linux/module.h> 22 #include <linux/of.h> 23 #include <linux/of_device.h> 24 #include <linux/of_gpio.h> 25 #include <video/of_display_timing.h> 26 #include <linux/regulator/consumer.h> 27 #include <video/videomode.h> 28 29 #include <video/atmel_lcdc.h> 30 31 struct atmel_lcdfb_config { 32 bool have_alt_pixclock; 33 bool have_hozval; 34 bool have_intensity_bit; 35 }; 36 37 /* LCD Controller info data structure, stored in device platform_data */ 38 struct atmel_lcdfb_info { 39 spinlock_t lock; 40 struct fb_info *info; 41 void __iomem *mmio; 42 int irq_base; 43 struct work_struct task; 44 45 unsigned int smem_len; 46 struct platform_device *pdev; 47 struct clk *bus_clk; 48 struct clk *lcdc_clk; 49 50 struct backlight_device *backlight; 51 u8 bl_power; 52 u8 saved_lcdcon; 53 54 u32 pseudo_palette[16]; 55 bool have_intensity_bit; 56 57 struct atmel_lcdfb_pdata pdata; 58 59 struct atmel_lcdfb_config *config; 60 struct regulator *reg_lcd; 61 }; 62 63 struct atmel_lcdfb_power_ctrl_gpio { 64 int gpio; 65 int active_low; 66 67 struct list_head list; 68 }; 69 70 #define lcdc_readl(sinfo, reg) __raw_readl((sinfo)->mmio+(reg)) 71 #define lcdc_writel(sinfo, reg, val) __raw_writel((val), (sinfo)->mmio+(reg)) 72 73 /* configurable parameters */ 74 #define ATMEL_LCDC_CVAL_DEFAULT 0xc8 75 #define ATMEL_LCDC_DMA_BURST_LEN 8 /* words */ 76 #define ATMEL_LCDC_FIFO_SIZE 512 /* words */ 77 78 static struct atmel_lcdfb_config at91sam9261_config = { 79 .have_hozval = true, 80 .have_intensity_bit = true, 81 }; 82 83 static struct atmel_lcdfb_config at91sam9263_config = { 84 .have_intensity_bit = true, 85 }; 86 87 static struct atmel_lcdfb_config at91sam9g10_config = { 88 .have_hozval = true, 89 }; 90 91 static struct atmel_lcdfb_config at91sam9g45_config = { 92 .have_alt_pixclock = true, 93 }; 94 95 static struct atmel_lcdfb_config at91sam9g45es_config = { 96 }; 97 98 static struct atmel_lcdfb_config at91sam9rl_config = { 99 .have_intensity_bit = true, 100 }; 101 102 static struct atmel_lcdfb_config at32ap_config = { 103 .have_hozval = true, 104 }; 105 106 static const struct platform_device_id atmel_lcdfb_devtypes[] = { 107 { 108 .name = "at91sam9261-lcdfb", 109 .driver_data = (unsigned long)&at91sam9261_config, 110 }, { 111 .name = "at91sam9263-lcdfb", 112 .driver_data = (unsigned long)&at91sam9263_config, 113 }, { 114 .name = "at91sam9g10-lcdfb", 115 .driver_data = (unsigned long)&at91sam9g10_config, 116 }, { 117 .name = "at91sam9g45-lcdfb", 118 .driver_data = (unsigned long)&at91sam9g45_config, 119 }, { 120 .name = "at91sam9g45es-lcdfb", 121 .driver_data = (unsigned long)&at91sam9g45es_config, 122 }, { 123 .name = "at91sam9rl-lcdfb", 124 .driver_data = (unsigned long)&at91sam9rl_config, 125 }, { 126 .name = "at32ap-lcdfb", 127 .driver_data = (unsigned long)&at32ap_config, 128 }, { 129 /* terminator */ 130 } 131 }; 132 MODULE_DEVICE_TABLE(platform, atmel_lcdfb_devtypes); 133 134 static struct atmel_lcdfb_config * 135 atmel_lcdfb_get_config(struct platform_device *pdev) 136 { 137 unsigned long data; 138 139 data = platform_get_device_id(pdev)->driver_data; 140 141 return (struct atmel_lcdfb_config *)data; 142 } 143 144 #if defined(CONFIG_ARCH_AT91) 145 #define ATMEL_LCDFB_FBINFO_DEFAULT (FBINFO_DEFAULT \ 146 | FBINFO_PARTIAL_PAN_OK \ 147 | FBINFO_HWACCEL_YPAN) 148 149 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo, 150 struct fb_var_screeninfo *var, 151 struct fb_info *info) 152 { 153 154 } 155 #elif defined(CONFIG_AVR32) 156 #define ATMEL_LCDFB_FBINFO_DEFAULT (FBINFO_DEFAULT \ 157 | FBINFO_PARTIAL_PAN_OK \ 158 | FBINFO_HWACCEL_XPAN \ 159 | FBINFO_HWACCEL_YPAN) 160 161 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo, 162 struct fb_var_screeninfo *var, 163 struct fb_info *info) 164 { 165 u32 dma2dcfg; 166 u32 pixeloff; 167 168 pixeloff = (var->xoffset * info->var.bits_per_pixel) & 0x1f; 169 170 dma2dcfg = (info->var.xres_virtual - info->var.xres) 171 * info->var.bits_per_pixel / 8; 172 dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET; 173 lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg); 174 175 /* Update configuration */ 176 lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 177 lcdc_readl(sinfo, ATMEL_LCDC_DMACON) 178 | ATMEL_LCDC_DMAUPDT); 179 } 180 #endif 181 182 static u32 contrast_ctr = ATMEL_LCDC_PS_DIV8 183 | ATMEL_LCDC_POL_POSITIVE 184 | ATMEL_LCDC_ENA_PWMENABLE; 185 186 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC 187 188 /* some bl->props field just changed */ 189 static int atmel_bl_update_status(struct backlight_device *bl) 190 { 191 struct atmel_lcdfb_info *sinfo = bl_get_data(bl); 192 int power = sinfo->bl_power; 193 int brightness = bl->props.brightness; 194 195 /* REVISIT there may be a meaningful difference between 196 * fb_blank and power ... there seem to be some cases 197 * this doesn't handle correctly. 198 */ 199 if (bl->props.fb_blank != sinfo->bl_power) 200 power = bl->props.fb_blank; 201 else if (bl->props.power != sinfo->bl_power) 202 power = bl->props.power; 203 204 if (brightness < 0 && power == FB_BLANK_UNBLANK) 205 brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL); 206 else if (power != FB_BLANK_UNBLANK) 207 brightness = 0; 208 209 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness); 210 if (contrast_ctr & ATMEL_LCDC_POL_POSITIVE) 211 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 212 brightness ? contrast_ctr : 0); 213 else 214 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr); 215 216 bl->props.fb_blank = bl->props.power = sinfo->bl_power = power; 217 218 return 0; 219 } 220 221 static int atmel_bl_get_brightness(struct backlight_device *bl) 222 { 223 struct atmel_lcdfb_info *sinfo = bl_get_data(bl); 224 225 return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL); 226 } 227 228 static const struct backlight_ops atmel_lcdc_bl_ops = { 229 .update_status = atmel_bl_update_status, 230 .get_brightness = atmel_bl_get_brightness, 231 }; 232 233 static void init_backlight(struct atmel_lcdfb_info *sinfo) 234 { 235 struct backlight_properties props; 236 struct backlight_device *bl; 237 238 sinfo->bl_power = FB_BLANK_UNBLANK; 239 240 if (sinfo->backlight) 241 return; 242 243 memset(&props, 0, sizeof(struct backlight_properties)); 244 props.type = BACKLIGHT_RAW; 245 props.max_brightness = 0xff; 246 bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo, 247 &atmel_lcdc_bl_ops, &props); 248 if (IS_ERR(bl)) { 249 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n", 250 PTR_ERR(bl)); 251 return; 252 } 253 sinfo->backlight = bl; 254 255 bl->props.power = FB_BLANK_UNBLANK; 256 bl->props.fb_blank = FB_BLANK_UNBLANK; 257 bl->props.brightness = atmel_bl_get_brightness(bl); 258 } 259 260 static void exit_backlight(struct atmel_lcdfb_info *sinfo) 261 { 262 if (!sinfo->backlight) 263 return; 264 265 if (sinfo->backlight->ops) { 266 sinfo->backlight->props.power = FB_BLANK_POWERDOWN; 267 sinfo->backlight->ops->update_status(sinfo->backlight); 268 } 269 backlight_device_unregister(sinfo->backlight); 270 } 271 272 #else 273 274 static void init_backlight(struct atmel_lcdfb_info *sinfo) 275 { 276 dev_warn(&sinfo->pdev->dev, "backlight control is not available\n"); 277 } 278 279 static void exit_backlight(struct atmel_lcdfb_info *sinfo) 280 { 281 } 282 283 #endif 284 285 static void init_contrast(struct atmel_lcdfb_info *sinfo) 286 { 287 struct atmel_lcdfb_pdata *pdata = &sinfo->pdata; 288 289 /* contrast pwm can be 'inverted' */ 290 if (pdata->lcdcon_pol_negative) 291 contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE); 292 293 /* have some default contrast/backlight settings */ 294 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr); 295 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT); 296 297 if (pdata->lcdcon_is_backlight) 298 init_backlight(sinfo); 299 } 300 301 static inline void atmel_lcdfb_power_control(struct atmel_lcdfb_info *sinfo, int on) 302 { 303 int ret; 304 struct atmel_lcdfb_pdata *pdata = &sinfo->pdata; 305 306 if (pdata->atmel_lcdfb_power_control) 307 pdata->atmel_lcdfb_power_control(pdata, on); 308 else if (sinfo->reg_lcd) { 309 if (on) { 310 ret = regulator_enable(sinfo->reg_lcd); 311 if (ret) 312 dev_err(&sinfo->pdev->dev, 313 "lcd regulator enable failed: %d\n", ret); 314 } else { 315 ret = regulator_disable(sinfo->reg_lcd); 316 if (ret) 317 dev_err(&sinfo->pdev->dev, 318 "lcd regulator disable failed: %d\n", ret); 319 } 320 } 321 } 322 323 static const struct fb_fix_screeninfo atmel_lcdfb_fix __initconst = { 324 .type = FB_TYPE_PACKED_PIXELS, 325 .visual = FB_VISUAL_TRUECOLOR, 326 .xpanstep = 0, 327 .ypanstep = 1, 328 .ywrapstep = 0, 329 .accel = FB_ACCEL_NONE, 330 }; 331 332 static unsigned long compute_hozval(struct atmel_lcdfb_info *sinfo, 333 unsigned long xres) 334 { 335 unsigned long lcdcon2; 336 unsigned long value; 337 338 if (!sinfo->config->have_hozval) 339 return xres; 340 341 lcdcon2 = lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2); 342 value = xres; 343 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) { 344 /* STN display */ 345 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) { 346 value *= 3; 347 } 348 if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4 349 || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8 350 && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL )) 351 value = DIV_ROUND_UP(value, 4); 352 else 353 value = DIV_ROUND_UP(value, 8); 354 } 355 356 return value; 357 } 358 359 static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo) 360 { 361 struct atmel_lcdfb_pdata *pdata = &sinfo->pdata; 362 363 /* Turn off the LCD controller and the DMA controller */ 364 lcdc_writel(sinfo, ATMEL_LCDC_PWRCON, 365 pdata->guard_time << ATMEL_LCDC_GUARDT_OFFSET); 366 367 /* Wait for the LCDC core to become idle */ 368 while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY) 369 msleep(10); 370 371 lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0); 372 } 373 374 static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo) 375 { 376 atmel_lcdfb_stop_nowait(sinfo); 377 378 /* Wait for DMA engine to become idle... */ 379 while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY) 380 msleep(10); 381 } 382 383 static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo) 384 { 385 struct atmel_lcdfb_pdata *pdata = &sinfo->pdata; 386 387 lcdc_writel(sinfo, ATMEL_LCDC_DMACON, pdata->default_dmacon); 388 lcdc_writel(sinfo, ATMEL_LCDC_PWRCON, 389 (pdata->guard_time << ATMEL_LCDC_GUARDT_OFFSET) 390 | ATMEL_LCDC_PWR); 391 } 392 393 static void atmel_lcdfb_update_dma(struct fb_info *info, 394 struct fb_var_screeninfo *var) 395 { 396 struct atmel_lcdfb_info *sinfo = info->par; 397 struct fb_fix_screeninfo *fix = &info->fix; 398 unsigned long dma_addr; 399 400 dma_addr = (fix->smem_start + var->yoffset * fix->line_length 401 + var->xoffset * info->var.bits_per_pixel / 8); 402 403 dma_addr &= ~3UL; 404 405 /* Set framebuffer DMA base address and pixel offset */ 406 lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr); 407 408 atmel_lcdfb_update_dma2d(sinfo, var, info); 409 } 410 411 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo) 412 { 413 struct fb_info *info = sinfo->info; 414 415 dma_free_wc(info->device, info->fix.smem_len, info->screen_base, 416 info->fix.smem_start); 417 } 418 419 /** 420 * atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory 421 * @sinfo: the frame buffer to allocate memory for 422 * 423 * This function is called only from the atmel_lcdfb_probe() 424 * so no locking by fb_info->mm_lock around smem_len setting is needed. 425 */ 426 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo) 427 { 428 struct fb_info *info = sinfo->info; 429 struct fb_var_screeninfo *var = &info->var; 430 unsigned int smem_len; 431 432 smem_len = (var->xres_virtual * var->yres_virtual 433 * ((var->bits_per_pixel + 7) / 8)); 434 info->fix.smem_len = max(smem_len, sinfo->smem_len); 435 436 info->screen_base = dma_alloc_wc(info->device, info->fix.smem_len, 437 (dma_addr_t *)&info->fix.smem_start, 438 GFP_KERNEL); 439 440 if (!info->screen_base) { 441 return -ENOMEM; 442 } 443 444 memset(info->screen_base, 0, info->fix.smem_len); 445 446 return 0; 447 } 448 449 static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var, 450 struct fb_info *info) 451 { 452 struct fb_videomode varfbmode; 453 const struct fb_videomode *fbmode = NULL; 454 455 fb_var_to_videomode(&varfbmode, var); 456 fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist); 457 if (fbmode) 458 fb_videomode_to_var(var, fbmode); 459 return fbmode; 460 } 461 462 463 /** 464 * atmel_lcdfb_check_var - Validates a var passed in. 465 * @var: frame buffer variable screen structure 466 * @info: frame buffer structure that represents a single frame buffer 467 * 468 * Checks to see if the hardware supports the state requested by 469 * var passed in. This function does not alter the hardware 470 * state!!! This means the data stored in struct fb_info and 471 * struct atmel_lcdfb_info do not change. This includes the var 472 * inside of struct fb_info. Do NOT change these. This function 473 * can be called on its own if we intent to only test a mode and 474 * not actually set it. The stuff in modedb.c is a example of 475 * this. If the var passed in is slightly off by what the 476 * hardware can support then we alter the var PASSED in to what 477 * we can do. If the hardware doesn't support mode change a 478 * -EINVAL will be returned by the upper layers. You don't need 479 * to implement this function then. If you hardware doesn't 480 * support changing the resolution then this function is not 481 * needed. In this case the driver would just provide a var that 482 * represents the static state the screen is in. 483 * 484 * Returns negative errno on error, or zero on success. 485 */ 486 static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var, 487 struct fb_info *info) 488 { 489 struct device *dev = info->device; 490 struct atmel_lcdfb_info *sinfo = info->par; 491 struct atmel_lcdfb_pdata *pdata = &sinfo->pdata; 492 unsigned long clk_value_khz; 493 494 clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000; 495 496 dev_dbg(dev, "%s:\n", __func__); 497 498 if (!(var->pixclock && var->bits_per_pixel)) { 499 /* choose a suitable mode if possible */ 500 if (!atmel_lcdfb_choose_mode(var, info)) { 501 dev_err(dev, "needed value not specified\n"); 502 return -EINVAL; 503 } 504 } 505 506 dev_dbg(dev, " resolution: %ux%u\n", var->xres, var->yres); 507 dev_dbg(dev, " pixclk: %lu KHz\n", PICOS2KHZ(var->pixclock)); 508 dev_dbg(dev, " bpp: %u\n", var->bits_per_pixel); 509 dev_dbg(dev, " clk: %lu KHz\n", clk_value_khz); 510 511 if (PICOS2KHZ(var->pixclock) > clk_value_khz) { 512 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock)); 513 return -EINVAL; 514 } 515 516 /* Do not allow to have real resoulution larger than virtual */ 517 if (var->xres > var->xres_virtual) 518 var->xres_virtual = var->xres; 519 520 if (var->yres > var->yres_virtual) 521 var->yres_virtual = var->yres; 522 523 /* Force same alignment for each line */ 524 var->xres = (var->xres + 3) & ~3UL; 525 var->xres_virtual = (var->xres_virtual + 3) & ~3UL; 526 527 var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0; 528 var->transp.msb_right = 0; 529 var->transp.offset = var->transp.length = 0; 530 var->xoffset = var->yoffset = 0; 531 532 if (info->fix.smem_len) { 533 unsigned int smem_len = (var->xres_virtual * var->yres_virtual 534 * ((var->bits_per_pixel + 7) / 8)); 535 if (smem_len > info->fix.smem_len) { 536 dev_err(dev, "Frame buffer is too small (%u) for screen size (need at least %u)\n", 537 info->fix.smem_len, smem_len); 538 return -EINVAL; 539 } 540 } 541 542 /* Saturate vertical and horizontal timings at maximum values */ 543 var->vsync_len = min_t(u32, var->vsync_len, 544 (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1); 545 var->upper_margin = min_t(u32, var->upper_margin, 546 ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET); 547 var->lower_margin = min_t(u32, var->lower_margin, 548 ATMEL_LCDC_VFP); 549 var->right_margin = min_t(u32, var->right_margin, 550 (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1); 551 var->hsync_len = min_t(u32, var->hsync_len, 552 (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1); 553 var->left_margin = min_t(u32, var->left_margin, 554 ATMEL_LCDC_HBP + 1); 555 556 /* Some parameters can't be zero */ 557 var->vsync_len = max_t(u32, var->vsync_len, 1); 558 var->right_margin = max_t(u32, var->right_margin, 1); 559 var->hsync_len = max_t(u32, var->hsync_len, 1); 560 var->left_margin = max_t(u32, var->left_margin, 1); 561 562 switch (var->bits_per_pixel) { 563 case 1: 564 case 2: 565 case 4: 566 case 8: 567 var->red.offset = var->green.offset = var->blue.offset = 0; 568 var->red.length = var->green.length = var->blue.length 569 = var->bits_per_pixel; 570 break; 571 case 16: 572 /* Older SOCs use IBGR:555 rather than BGR:565. */ 573 if (sinfo->config->have_intensity_bit) 574 var->green.length = 5; 575 else 576 var->green.length = 6; 577 578 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) { 579 /* RGB:5X5 mode */ 580 var->red.offset = var->green.length + 5; 581 var->blue.offset = 0; 582 } else { 583 /* BGR:5X5 mode */ 584 var->red.offset = 0; 585 var->blue.offset = var->green.length + 5; 586 } 587 var->green.offset = 5; 588 var->red.length = var->blue.length = 5; 589 break; 590 case 32: 591 var->transp.offset = 24; 592 var->transp.length = 8; 593 /* fall through */ 594 case 24: 595 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) { 596 /* RGB:888 mode */ 597 var->red.offset = 16; 598 var->blue.offset = 0; 599 } else { 600 /* BGR:888 mode */ 601 var->red.offset = 0; 602 var->blue.offset = 16; 603 } 604 var->green.offset = 8; 605 var->red.length = var->green.length = var->blue.length = 8; 606 break; 607 default: 608 dev_err(dev, "color depth %d not supported\n", 609 var->bits_per_pixel); 610 return -EINVAL; 611 } 612 613 return 0; 614 } 615 616 /* 617 * LCD reset sequence 618 */ 619 static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo) 620 { 621 might_sleep(); 622 623 atmel_lcdfb_stop(sinfo); 624 atmel_lcdfb_start(sinfo); 625 } 626 627 /** 628 * atmel_lcdfb_set_par - Alters the hardware state. 629 * @info: frame buffer structure that represents a single frame buffer 630 * 631 * Using the fb_var_screeninfo in fb_info we set the resolution 632 * of the this particular framebuffer. This function alters the 633 * par AND the fb_fix_screeninfo stored in fb_info. It doesn't 634 * not alter var in fb_info since we are using that data. This 635 * means we depend on the data in var inside fb_info to be 636 * supported by the hardware. atmel_lcdfb_check_var is always called 637 * before atmel_lcdfb_set_par to ensure this. Again if you can't 638 * change the resolution you don't need this function. 639 * 640 */ 641 static int atmel_lcdfb_set_par(struct fb_info *info) 642 { 643 struct atmel_lcdfb_info *sinfo = info->par; 644 struct atmel_lcdfb_pdata *pdata = &sinfo->pdata; 645 unsigned long hozval_linesz; 646 unsigned long value; 647 unsigned long clk_value_khz; 648 unsigned long bits_per_line; 649 unsigned long pix_factor = 2; 650 651 might_sleep(); 652 653 dev_dbg(info->device, "%s:\n", __func__); 654 dev_dbg(info->device, " * resolution: %ux%u (%ux%u virtual)\n", 655 info->var.xres, info->var.yres, 656 info->var.xres_virtual, info->var.yres_virtual); 657 658 atmel_lcdfb_stop_nowait(sinfo); 659 660 if (info->var.bits_per_pixel == 1) 661 info->fix.visual = FB_VISUAL_MONO01; 662 else if (info->var.bits_per_pixel <= 8) 663 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 664 else 665 info->fix.visual = FB_VISUAL_TRUECOLOR; 666 667 bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel; 668 info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8); 669 670 /* Re-initialize the DMA engine... */ 671 dev_dbg(info->device, " * update DMA engine\n"); 672 atmel_lcdfb_update_dma(info, &info->var); 673 674 /* ...set frame size and burst length = 8 words (?) */ 675 value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32; 676 value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET); 677 lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value); 678 679 /* Now, the LCDC core... */ 680 681 /* Set pixel clock */ 682 if (sinfo->config->have_alt_pixclock) 683 pix_factor = 1; 684 685 clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000; 686 687 value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock)); 688 689 if (value < pix_factor) { 690 dev_notice(info->device, "Bypassing pixel clock divider\n"); 691 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS); 692 } else { 693 value = (value / pix_factor) - 1; 694 dev_dbg(info->device, " * programming CLKVAL = 0x%08lx\n", 695 value); 696 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, 697 value << ATMEL_LCDC_CLKVAL_OFFSET); 698 info->var.pixclock = 699 KHZ2PICOS(clk_value_khz / (pix_factor * (value + 1))); 700 dev_dbg(info->device, " updated pixclk: %lu KHz\n", 701 PICOS2KHZ(info->var.pixclock)); 702 } 703 704 705 /* Initialize control register 2 */ 706 value = pdata->default_lcdcon2; 707 708 if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT)) 709 value |= ATMEL_LCDC_INVLINE_INVERTED; 710 if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT)) 711 value |= ATMEL_LCDC_INVFRAME_INVERTED; 712 713 switch (info->var.bits_per_pixel) { 714 case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break; 715 case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break; 716 case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break; 717 case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break; 718 case 15: /* fall through */ 719 case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break; 720 case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break; 721 case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break; 722 default: BUG(); break; 723 } 724 dev_dbg(info->device, " * LCDCON2 = %08lx\n", value); 725 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value); 726 727 /* Vertical timing */ 728 value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET; 729 value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET; 730 value |= info->var.lower_margin; 731 dev_dbg(info->device, " * LCDTIM1 = %08lx\n", value); 732 lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value); 733 734 /* Horizontal timing */ 735 value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET; 736 value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET; 737 value |= (info->var.left_margin - 1); 738 dev_dbg(info->device, " * LCDTIM2 = %08lx\n", value); 739 lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value); 740 741 /* Horizontal value (aka line size) */ 742 hozval_linesz = compute_hozval(sinfo, info->var.xres); 743 744 /* Display size */ 745 value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET; 746 value |= info->var.yres - 1; 747 dev_dbg(info->device, " * LCDFRMCFG = %08lx\n", value); 748 lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value); 749 750 /* FIFO Threshold: Use formula from data sheet */ 751 value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3); 752 lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value); 753 754 /* Toggle LCD_MODE every frame */ 755 lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0); 756 757 /* Disable all interrupts */ 758 lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL); 759 /* Enable FIFO & DMA errors */ 760 lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI); 761 762 /* ...wait for DMA engine to become idle... */ 763 while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY) 764 msleep(10); 765 766 atmel_lcdfb_start(sinfo); 767 768 dev_dbg(info->device, " * DONE\n"); 769 770 return 0; 771 } 772 773 static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf) 774 { 775 chan &= 0xffff; 776 chan >>= 16 - bf->length; 777 return chan << bf->offset; 778 } 779 780 /** 781 * atmel_lcdfb_setcolreg - Optional function. Sets a color register. 782 * @regno: Which register in the CLUT we are programming 783 * @red: The red value which can be up to 16 bits wide 784 * @green: The green value which can be up to 16 bits wide 785 * @blue: The blue value which can be up to 16 bits wide. 786 * @transp: If supported the alpha value which can be up to 16 bits wide. 787 * @info: frame buffer info structure 788 * 789 * Set a single color register. The values supplied have a 16 bit 790 * magnitude which needs to be scaled in this function for the hardware. 791 * Things to take into consideration are how many color registers, if 792 * any, are supported with the current color visual. With truecolor mode 793 * no color palettes are supported. Here a pseudo palette is created 794 * which we store the value in pseudo_palette in struct fb_info. For 795 * pseudocolor mode we have a limited color palette. To deal with this 796 * we can program what color is displayed for a particular pixel value. 797 * DirectColor is similar in that we can program each color field. If 798 * we have a static colormap we don't need to implement this function. 799 * 800 * Returns negative errno on error, or zero on success. In an 801 * ideal world, this would have been the case, but as it turns 802 * out, the other drivers return 1 on failure, so that's what 803 * we're going to do. 804 */ 805 static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red, 806 unsigned int green, unsigned int blue, 807 unsigned int transp, struct fb_info *info) 808 { 809 struct atmel_lcdfb_info *sinfo = info->par; 810 struct atmel_lcdfb_pdata *pdata = &sinfo->pdata; 811 unsigned int val; 812 u32 *pal; 813 int ret = 1; 814 815 if (info->var.grayscale) 816 red = green = blue = (19595 * red + 38470 * green 817 + 7471 * blue) >> 16; 818 819 switch (info->fix.visual) { 820 case FB_VISUAL_TRUECOLOR: 821 if (regno < 16) { 822 pal = info->pseudo_palette; 823 824 val = chan_to_field(red, &info->var.red); 825 val |= chan_to_field(green, &info->var.green); 826 val |= chan_to_field(blue, &info->var.blue); 827 828 pal[regno] = val; 829 ret = 0; 830 } 831 break; 832 833 case FB_VISUAL_PSEUDOCOLOR: 834 if (regno < 256) { 835 if (sinfo->config->have_intensity_bit) { 836 /* old style I+BGR:555 */ 837 val = ((red >> 11) & 0x001f); 838 val |= ((green >> 6) & 0x03e0); 839 val |= ((blue >> 1) & 0x7c00); 840 841 /* 842 * TODO: intensity bit. Maybe something like 843 * ~(red[10] ^ green[10] ^ blue[10]) & 1 844 */ 845 } else { 846 /* new style BGR:565 / RGB:565 */ 847 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) { 848 val = ((blue >> 11) & 0x001f); 849 val |= ((red >> 0) & 0xf800); 850 } else { 851 val = ((red >> 11) & 0x001f); 852 val |= ((blue >> 0) & 0xf800); 853 } 854 855 val |= ((green >> 5) & 0x07e0); 856 } 857 858 lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val); 859 ret = 0; 860 } 861 break; 862 863 case FB_VISUAL_MONO01: 864 if (regno < 2) { 865 val = (regno == 0) ? 0x00 : 0x1F; 866 lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val); 867 ret = 0; 868 } 869 break; 870 871 } 872 873 return ret; 874 } 875 876 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var, 877 struct fb_info *info) 878 { 879 dev_dbg(info->device, "%s\n", __func__); 880 881 atmel_lcdfb_update_dma(info, var); 882 883 return 0; 884 } 885 886 static int atmel_lcdfb_blank(int blank_mode, struct fb_info *info) 887 { 888 struct atmel_lcdfb_info *sinfo = info->par; 889 890 switch (blank_mode) { 891 case FB_BLANK_UNBLANK: 892 case FB_BLANK_NORMAL: 893 atmel_lcdfb_start(sinfo); 894 break; 895 case FB_BLANK_VSYNC_SUSPEND: 896 case FB_BLANK_HSYNC_SUSPEND: 897 break; 898 case FB_BLANK_POWERDOWN: 899 atmel_lcdfb_stop(sinfo); 900 break; 901 default: 902 return -EINVAL; 903 } 904 905 /* let fbcon do a soft blank for us */ 906 return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0); 907 } 908 909 static struct fb_ops atmel_lcdfb_ops = { 910 .owner = THIS_MODULE, 911 .fb_check_var = atmel_lcdfb_check_var, 912 .fb_set_par = atmel_lcdfb_set_par, 913 .fb_setcolreg = atmel_lcdfb_setcolreg, 914 .fb_blank = atmel_lcdfb_blank, 915 .fb_pan_display = atmel_lcdfb_pan_display, 916 .fb_fillrect = cfb_fillrect, 917 .fb_copyarea = cfb_copyarea, 918 .fb_imageblit = cfb_imageblit, 919 }; 920 921 static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id) 922 { 923 struct fb_info *info = dev_id; 924 struct atmel_lcdfb_info *sinfo = info->par; 925 u32 status; 926 927 status = lcdc_readl(sinfo, ATMEL_LCDC_ISR); 928 if (status & ATMEL_LCDC_UFLWI) { 929 dev_warn(info->device, "FIFO underflow %#x\n", status); 930 /* reset DMA and FIFO to avoid screen shifting */ 931 schedule_work(&sinfo->task); 932 } 933 lcdc_writel(sinfo, ATMEL_LCDC_ICR, status); 934 return IRQ_HANDLED; 935 } 936 937 /* 938 * LCD controller task (to reset the LCD) 939 */ 940 static void atmel_lcdfb_task(struct work_struct *work) 941 { 942 struct atmel_lcdfb_info *sinfo = 943 container_of(work, struct atmel_lcdfb_info, task); 944 945 atmel_lcdfb_reset(sinfo); 946 } 947 948 static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo) 949 { 950 struct fb_info *info = sinfo->info; 951 int ret = 0; 952 953 info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW; 954 955 dev_info(info->device, 956 "%luKiB frame buffer at %08lx (mapped at %p)\n", 957 (unsigned long)info->fix.smem_len / 1024, 958 (unsigned long)info->fix.smem_start, 959 info->screen_base); 960 961 /* Allocate colormap */ 962 ret = fb_alloc_cmap(&info->cmap, 256, 0); 963 if (ret < 0) 964 dev_err(info->device, "Alloc color map failed\n"); 965 966 return ret; 967 } 968 969 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo) 970 { 971 clk_prepare_enable(sinfo->bus_clk); 972 clk_prepare_enable(sinfo->lcdc_clk); 973 } 974 975 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo) 976 { 977 clk_disable_unprepare(sinfo->bus_clk); 978 clk_disable_unprepare(sinfo->lcdc_clk); 979 } 980 981 #ifdef CONFIG_OF 982 static const struct of_device_id atmel_lcdfb_dt_ids[] = { 983 { .compatible = "atmel,at91sam9261-lcdc" , .data = &at91sam9261_config, }, 984 { .compatible = "atmel,at91sam9263-lcdc" , .data = &at91sam9263_config, }, 985 { .compatible = "atmel,at91sam9g10-lcdc" , .data = &at91sam9g10_config, }, 986 { .compatible = "atmel,at91sam9g45-lcdc" , .data = &at91sam9g45_config, }, 987 { .compatible = "atmel,at91sam9g45es-lcdc" , .data = &at91sam9g45es_config, }, 988 { .compatible = "atmel,at91sam9rl-lcdc" , .data = &at91sam9rl_config, }, 989 { .compatible = "atmel,at32ap-lcdc" , .data = &at32ap_config, }, 990 { /* sentinel */ } 991 }; 992 993 MODULE_DEVICE_TABLE(of, atmel_lcdfb_dt_ids); 994 995 static const char *atmel_lcdfb_wiring_modes[] = { 996 [ATMEL_LCDC_WIRING_BGR] = "BRG", 997 [ATMEL_LCDC_WIRING_RGB] = "RGB", 998 }; 999 1000 static int atmel_lcdfb_get_of_wiring_modes(struct device_node *np) 1001 { 1002 const char *mode; 1003 int err, i; 1004 1005 err = of_property_read_string(np, "atmel,lcd-wiring-mode", &mode); 1006 if (err < 0) 1007 return ATMEL_LCDC_WIRING_BGR; 1008 1009 for (i = 0; i < ARRAY_SIZE(atmel_lcdfb_wiring_modes); i++) 1010 if (!strcasecmp(mode, atmel_lcdfb_wiring_modes[i])) 1011 return i; 1012 1013 return -ENODEV; 1014 } 1015 1016 static void atmel_lcdfb_power_control_gpio(struct atmel_lcdfb_pdata *pdata, int on) 1017 { 1018 struct atmel_lcdfb_power_ctrl_gpio *og; 1019 1020 list_for_each_entry(og, &pdata->pwr_gpios, list) 1021 gpio_set_value(og->gpio, on); 1022 } 1023 1024 static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo) 1025 { 1026 struct fb_info *info = sinfo->info; 1027 struct atmel_lcdfb_pdata *pdata = &sinfo->pdata; 1028 struct fb_var_screeninfo *var = &info->var; 1029 struct device *dev = &sinfo->pdev->dev; 1030 struct device_node *np =dev->of_node; 1031 struct device_node *display_np; 1032 struct device_node *timings_np; 1033 struct display_timings *timings; 1034 enum of_gpio_flags flags; 1035 struct atmel_lcdfb_power_ctrl_gpio *og; 1036 bool is_gpio_power = false; 1037 int ret = -ENOENT; 1038 int i, gpio; 1039 1040 sinfo->config = (struct atmel_lcdfb_config*) 1041 of_match_device(atmel_lcdfb_dt_ids, dev)->data; 1042 1043 display_np = of_parse_phandle(np, "display", 0); 1044 if (!display_np) { 1045 dev_err(dev, "failed to find display phandle\n"); 1046 return -ENOENT; 1047 } 1048 1049 ret = of_property_read_u32(display_np, "bits-per-pixel", &var->bits_per_pixel); 1050 if (ret < 0) { 1051 dev_err(dev, "failed to get property bits-per-pixel\n"); 1052 goto put_display_node; 1053 } 1054 1055 ret = of_property_read_u32(display_np, "atmel,guard-time", &pdata->guard_time); 1056 if (ret < 0) { 1057 dev_err(dev, "failed to get property atmel,guard-time\n"); 1058 goto put_display_node; 1059 } 1060 1061 ret = of_property_read_u32(display_np, "atmel,lcdcon2", &pdata->default_lcdcon2); 1062 if (ret < 0) { 1063 dev_err(dev, "failed to get property atmel,lcdcon2\n"); 1064 goto put_display_node; 1065 } 1066 1067 ret = of_property_read_u32(display_np, "atmel,dmacon", &pdata->default_dmacon); 1068 if (ret < 0) { 1069 dev_err(dev, "failed to get property bits-per-pixel\n"); 1070 goto put_display_node; 1071 } 1072 1073 INIT_LIST_HEAD(&pdata->pwr_gpios); 1074 ret = -ENOMEM; 1075 for (i = 0; i < of_gpio_named_count(display_np, "atmel,power-control-gpio"); i++) { 1076 gpio = of_get_named_gpio_flags(display_np, "atmel,power-control-gpio", 1077 i, &flags); 1078 if (gpio < 0) 1079 continue; 1080 1081 og = devm_kzalloc(dev, sizeof(*og), GFP_KERNEL); 1082 if (!og) 1083 goto put_display_node; 1084 1085 og->gpio = gpio; 1086 og->active_low = flags & OF_GPIO_ACTIVE_LOW; 1087 is_gpio_power = true; 1088 ret = devm_gpio_request(dev, gpio, "lcd-power-control-gpio"); 1089 if (ret) { 1090 dev_err(dev, "request gpio %d failed\n", gpio); 1091 goto put_display_node; 1092 } 1093 1094 ret = gpio_direction_output(gpio, og->active_low); 1095 if (ret) { 1096 dev_err(dev, "set direction output gpio %d failed\n", gpio); 1097 goto put_display_node; 1098 } 1099 list_add(&og->list, &pdata->pwr_gpios); 1100 } 1101 1102 if (is_gpio_power) 1103 pdata->atmel_lcdfb_power_control = atmel_lcdfb_power_control_gpio; 1104 1105 ret = atmel_lcdfb_get_of_wiring_modes(display_np); 1106 if (ret < 0) { 1107 dev_err(dev, "invalid atmel,lcd-wiring-mode\n"); 1108 goto put_display_node; 1109 } 1110 pdata->lcd_wiring_mode = ret; 1111 1112 pdata->lcdcon_is_backlight = of_property_read_bool(display_np, "atmel,lcdcon-backlight"); 1113 pdata->lcdcon_pol_negative = of_property_read_bool(display_np, "atmel,lcdcon-backlight-inverted"); 1114 1115 timings = of_get_display_timings(display_np); 1116 if (!timings) { 1117 dev_err(dev, "failed to get display timings\n"); 1118 ret = -EINVAL; 1119 goto put_display_node; 1120 } 1121 1122 timings_np = of_find_node_by_name(display_np, "display-timings"); 1123 if (!timings_np) { 1124 dev_err(dev, "failed to find display-timings node\n"); 1125 ret = -ENODEV; 1126 goto put_display_node; 1127 } 1128 1129 for (i = 0; i < of_get_child_count(timings_np); i++) { 1130 struct videomode vm; 1131 struct fb_videomode fb_vm; 1132 1133 ret = videomode_from_timings(timings, &vm, i); 1134 if (ret < 0) 1135 goto put_timings_node; 1136 ret = fb_videomode_from_videomode(&vm, &fb_vm); 1137 if (ret < 0) 1138 goto put_timings_node; 1139 1140 fb_add_videomode(&fb_vm, &info->modelist); 1141 } 1142 1143 return 0; 1144 1145 put_timings_node: 1146 of_node_put(timings_np); 1147 put_display_node: 1148 of_node_put(display_np); 1149 return ret; 1150 } 1151 #else 1152 static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo) 1153 { 1154 return 0; 1155 } 1156 #endif 1157 1158 static int __init atmel_lcdfb_probe(struct platform_device *pdev) 1159 { 1160 struct device *dev = &pdev->dev; 1161 struct fb_info *info; 1162 struct atmel_lcdfb_info *sinfo; 1163 struct atmel_lcdfb_pdata *pdata = NULL; 1164 struct resource *regs = NULL; 1165 struct resource *map = NULL; 1166 struct fb_modelist *modelist; 1167 int ret; 1168 1169 dev_dbg(dev, "%s BEGIN\n", __func__); 1170 1171 ret = -ENOMEM; 1172 info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev); 1173 if (!info) { 1174 dev_err(dev, "cannot allocate memory\n"); 1175 goto out; 1176 } 1177 1178 sinfo = info->par; 1179 sinfo->pdev = pdev; 1180 sinfo->info = info; 1181 1182 INIT_LIST_HEAD(&info->modelist); 1183 1184 if (pdev->dev.of_node) { 1185 ret = atmel_lcdfb_of_init(sinfo); 1186 if (ret) 1187 goto free_info; 1188 } else if (dev_get_platdata(dev)) { 1189 struct fb_monspecs *monspecs; 1190 int i; 1191 1192 pdata = dev_get_platdata(dev); 1193 monspecs = pdata->default_monspecs; 1194 sinfo->pdata = *pdata; 1195 1196 for (i = 0; i < monspecs->modedb_len; i++) 1197 fb_add_videomode(&monspecs->modedb[i], &info->modelist); 1198 1199 sinfo->config = atmel_lcdfb_get_config(pdev); 1200 1201 info->var.bits_per_pixel = pdata->default_bpp ? pdata->default_bpp : 16; 1202 memcpy(&info->monspecs, pdata->default_monspecs, sizeof(info->monspecs)); 1203 } else { 1204 dev_err(dev, "cannot get default configuration\n"); 1205 goto free_info; 1206 } 1207 1208 if (!sinfo->config) 1209 goto free_info; 1210 1211 sinfo->reg_lcd = devm_regulator_get(&pdev->dev, "lcd"); 1212 if (IS_ERR(sinfo->reg_lcd)) 1213 sinfo->reg_lcd = NULL; 1214 1215 info->flags = ATMEL_LCDFB_FBINFO_DEFAULT; 1216 info->pseudo_palette = sinfo->pseudo_palette; 1217 info->fbops = &atmel_lcdfb_ops; 1218 1219 info->fix = atmel_lcdfb_fix; 1220 strcpy(info->fix.id, sinfo->pdev->name); 1221 1222 /* Enable LCDC Clocks */ 1223 sinfo->bus_clk = clk_get(dev, "hclk"); 1224 if (IS_ERR(sinfo->bus_clk)) { 1225 ret = PTR_ERR(sinfo->bus_clk); 1226 goto free_info; 1227 } 1228 sinfo->lcdc_clk = clk_get(dev, "lcdc_clk"); 1229 if (IS_ERR(sinfo->lcdc_clk)) { 1230 ret = PTR_ERR(sinfo->lcdc_clk); 1231 goto put_bus_clk; 1232 } 1233 atmel_lcdfb_start_clock(sinfo); 1234 1235 modelist = list_first_entry(&info->modelist, 1236 struct fb_modelist, list); 1237 fb_videomode_to_var(&info->var, &modelist->mode); 1238 1239 atmel_lcdfb_check_var(&info->var, info); 1240 1241 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1242 if (!regs) { 1243 dev_err(dev, "resources unusable\n"); 1244 ret = -ENXIO; 1245 goto stop_clk; 1246 } 1247 1248 sinfo->irq_base = platform_get_irq(pdev, 0); 1249 if (sinfo->irq_base < 0) { 1250 dev_err(dev, "unable to get irq\n"); 1251 ret = sinfo->irq_base; 1252 goto stop_clk; 1253 } 1254 1255 /* Initialize video memory */ 1256 map = platform_get_resource(pdev, IORESOURCE_MEM, 1); 1257 if (map) { 1258 /* use a pre-allocated memory buffer */ 1259 info->fix.smem_start = map->start; 1260 info->fix.smem_len = resource_size(map); 1261 if (!request_mem_region(info->fix.smem_start, 1262 info->fix.smem_len, pdev->name)) { 1263 ret = -EBUSY; 1264 goto stop_clk; 1265 } 1266 1267 info->screen_base = ioremap_wc(info->fix.smem_start, 1268 info->fix.smem_len); 1269 if (!info->screen_base) { 1270 ret = -ENOMEM; 1271 goto release_intmem; 1272 } 1273 1274 /* 1275 * Don't clear the framebuffer -- someone may have set 1276 * up a splash image. 1277 */ 1278 } else { 1279 /* allocate memory buffer */ 1280 ret = atmel_lcdfb_alloc_video_memory(sinfo); 1281 if (ret < 0) { 1282 dev_err(dev, "cannot allocate framebuffer: %d\n", ret); 1283 goto stop_clk; 1284 } 1285 } 1286 1287 /* LCDC registers */ 1288 info->fix.mmio_start = regs->start; 1289 info->fix.mmio_len = resource_size(regs); 1290 1291 if (!request_mem_region(info->fix.mmio_start, 1292 info->fix.mmio_len, pdev->name)) { 1293 ret = -EBUSY; 1294 goto free_fb; 1295 } 1296 1297 sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len); 1298 if (!sinfo->mmio) { 1299 dev_err(dev, "cannot map LCDC registers\n"); 1300 ret = -ENOMEM; 1301 goto release_mem; 1302 } 1303 1304 /* Initialize PWM for contrast or backlight ("off") */ 1305 init_contrast(sinfo); 1306 1307 /* interrupt */ 1308 ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info); 1309 if (ret) { 1310 dev_err(dev, "request_irq failed: %d\n", ret); 1311 goto unmap_mmio; 1312 } 1313 1314 /* Some operations on the LCDC might sleep and 1315 * require a preemptible task context */ 1316 INIT_WORK(&sinfo->task, atmel_lcdfb_task); 1317 1318 ret = atmel_lcdfb_init_fbinfo(sinfo); 1319 if (ret < 0) { 1320 dev_err(dev, "init fbinfo failed: %d\n", ret); 1321 goto unregister_irqs; 1322 } 1323 1324 ret = atmel_lcdfb_set_par(info); 1325 if (ret < 0) { 1326 dev_err(dev, "set par failed: %d\n", ret); 1327 goto unregister_irqs; 1328 } 1329 1330 dev_set_drvdata(dev, info); 1331 1332 /* 1333 * Tell the world that we're ready to go 1334 */ 1335 ret = register_framebuffer(info); 1336 if (ret < 0) { 1337 dev_err(dev, "failed to register framebuffer device: %d\n", ret); 1338 goto reset_drvdata; 1339 } 1340 1341 /* Power up the LCDC screen */ 1342 atmel_lcdfb_power_control(sinfo, 1); 1343 1344 dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n", 1345 info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base); 1346 1347 return 0; 1348 1349 reset_drvdata: 1350 dev_set_drvdata(dev, NULL); 1351 fb_dealloc_cmap(&info->cmap); 1352 unregister_irqs: 1353 cancel_work_sync(&sinfo->task); 1354 free_irq(sinfo->irq_base, info); 1355 unmap_mmio: 1356 exit_backlight(sinfo); 1357 iounmap(sinfo->mmio); 1358 release_mem: 1359 release_mem_region(info->fix.mmio_start, info->fix.mmio_len); 1360 free_fb: 1361 if (map) 1362 iounmap(info->screen_base); 1363 else 1364 atmel_lcdfb_free_video_memory(sinfo); 1365 1366 release_intmem: 1367 if (map) 1368 release_mem_region(info->fix.smem_start, info->fix.smem_len); 1369 stop_clk: 1370 atmel_lcdfb_stop_clock(sinfo); 1371 clk_put(sinfo->lcdc_clk); 1372 put_bus_clk: 1373 clk_put(sinfo->bus_clk); 1374 free_info: 1375 framebuffer_release(info); 1376 out: 1377 dev_dbg(dev, "%s FAILED\n", __func__); 1378 return ret; 1379 } 1380 1381 static int __exit atmel_lcdfb_remove(struct platform_device *pdev) 1382 { 1383 struct device *dev = &pdev->dev; 1384 struct fb_info *info = dev_get_drvdata(dev); 1385 struct atmel_lcdfb_info *sinfo; 1386 struct atmel_lcdfb_pdata *pdata; 1387 1388 if (!info || !info->par) 1389 return 0; 1390 sinfo = info->par; 1391 pdata = &sinfo->pdata; 1392 1393 cancel_work_sync(&sinfo->task); 1394 exit_backlight(sinfo); 1395 atmel_lcdfb_power_control(sinfo, 0); 1396 unregister_framebuffer(info); 1397 atmel_lcdfb_stop_clock(sinfo); 1398 clk_put(sinfo->lcdc_clk); 1399 clk_put(sinfo->bus_clk); 1400 fb_dealloc_cmap(&info->cmap); 1401 free_irq(sinfo->irq_base, info); 1402 iounmap(sinfo->mmio); 1403 release_mem_region(info->fix.mmio_start, info->fix.mmio_len); 1404 if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) { 1405 iounmap(info->screen_base); 1406 release_mem_region(info->fix.smem_start, info->fix.smem_len); 1407 } else { 1408 atmel_lcdfb_free_video_memory(sinfo); 1409 } 1410 1411 framebuffer_release(info); 1412 1413 return 0; 1414 } 1415 1416 #ifdef CONFIG_PM 1417 1418 static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg) 1419 { 1420 struct fb_info *info = platform_get_drvdata(pdev); 1421 struct atmel_lcdfb_info *sinfo = info->par; 1422 1423 /* 1424 * We don't want to handle interrupts while the clock is 1425 * stopped. It may take forever. 1426 */ 1427 lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL); 1428 1429 sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_CTR); 1430 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0); 1431 atmel_lcdfb_power_control(sinfo, 0); 1432 atmel_lcdfb_stop(sinfo); 1433 atmel_lcdfb_stop_clock(sinfo); 1434 1435 return 0; 1436 } 1437 1438 static int atmel_lcdfb_resume(struct platform_device *pdev) 1439 { 1440 struct fb_info *info = platform_get_drvdata(pdev); 1441 struct atmel_lcdfb_info *sinfo = info->par; 1442 1443 atmel_lcdfb_start_clock(sinfo); 1444 atmel_lcdfb_start(sinfo); 1445 atmel_lcdfb_power_control(sinfo, 1); 1446 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon); 1447 1448 /* Enable FIFO & DMA errors */ 1449 lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI 1450 | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI); 1451 1452 return 0; 1453 } 1454 1455 #else 1456 #define atmel_lcdfb_suspend NULL 1457 #define atmel_lcdfb_resume NULL 1458 #endif 1459 1460 static struct platform_driver atmel_lcdfb_driver = { 1461 .remove = __exit_p(atmel_lcdfb_remove), 1462 .suspend = atmel_lcdfb_suspend, 1463 .resume = atmel_lcdfb_resume, 1464 .id_table = atmel_lcdfb_devtypes, 1465 .driver = { 1466 .name = "atmel_lcdfb", 1467 .of_match_table = of_match_ptr(atmel_lcdfb_dt_ids), 1468 }, 1469 }; 1470 1471 module_platform_driver_probe(atmel_lcdfb_driver, atmel_lcdfb_probe); 1472 1473 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver"); 1474 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>"); 1475 MODULE_LICENSE("GPL"); 1476