2 * Driver for AT91/AT32 LCD Controller
4 * Copyright (C) 2007 Atmel Corporation
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
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>
17 #include <linux/init.h>
18 #include <linux/delay.h>
19 #include <linux/backlight.h>
20 #include <linux/gfp.h>
21 #include <linux/gpio/consumer.h>
22 #include <linux/module.h>
24 #include <linux/of_device.h>
25 #include <video/of_videomode.h>
26 #include <video/of_display_timing.h>
27 #include <linux/regulator/consumer.h>
28 #include <video/videomode.h>
30 #include <video/atmel_lcdc.h>
32 struct atmel_lcdfb_config {
33 bool have_alt_pixclock;
35 bool have_intensity_bit;
38 /* LCD Controller info data structure, stored in device platform_data */
39 struct atmel_lcdfb_info {
44 struct work_struct task;
46 unsigned int smem_len;
47 struct platform_device *pdev;
51 struct backlight_device *backlight;
55 u32 pseudo_palette[16];
56 bool have_intensity_bit;
58 struct atmel_lcdfb_pdata pdata;
60 struct atmel_lcdfb_config *config;
61 struct regulator *reg_lcd;
64 struct atmel_lcdfb_power_ctrl_gpio {
65 struct gpio_desc *gpiod;
67 struct list_head list;
70 #define lcdc_readl(sinfo, reg) __raw_readl((sinfo)->mmio+(reg))
71 #define lcdc_writel(sinfo, reg, val) __raw_writel((val), (sinfo)->mmio+(reg))
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 */
78 static struct atmel_lcdfb_config at91sam9261_config = {
80 .have_intensity_bit = true,
83 static struct atmel_lcdfb_config at91sam9263_config = {
84 .have_intensity_bit = true,
87 static struct atmel_lcdfb_config at91sam9g10_config = {
91 static struct atmel_lcdfb_config at91sam9g45_config = {
92 .have_alt_pixclock = true,
95 static struct atmel_lcdfb_config at91sam9g45es_config = {
98 static struct atmel_lcdfb_config at91sam9rl_config = {
99 .have_intensity_bit = true,
102 static struct atmel_lcdfb_config at32ap_config = {
106 static const struct platform_device_id atmel_lcdfb_devtypes[] = {
108 .name = "at91sam9261-lcdfb",
109 .driver_data = (unsigned long)&at91sam9261_config,
111 .name = "at91sam9263-lcdfb",
112 .driver_data = (unsigned long)&at91sam9263_config,
114 .name = "at91sam9g10-lcdfb",
115 .driver_data = (unsigned long)&at91sam9g10_config,
117 .name = "at91sam9g45-lcdfb",
118 .driver_data = (unsigned long)&at91sam9g45_config,
120 .name = "at91sam9g45es-lcdfb",
121 .driver_data = (unsigned long)&at91sam9g45es_config,
123 .name = "at91sam9rl-lcdfb",
124 .driver_data = (unsigned long)&at91sam9rl_config,
126 .name = "at32ap-lcdfb",
127 .driver_data = (unsigned long)&at32ap_config,
132 MODULE_DEVICE_TABLE(platform, atmel_lcdfb_devtypes);
134 static struct atmel_lcdfb_config *
135 atmel_lcdfb_get_config(struct platform_device *pdev)
139 data = platform_get_device_id(pdev)->driver_data;
141 return (struct atmel_lcdfb_config *)data;
144 #if defined(CONFIG_ARCH_AT91)
145 #define ATMEL_LCDFB_FBINFO_DEFAULT (FBINFO_DEFAULT \
146 | FBINFO_PARTIAL_PAN_OK \
147 | FBINFO_HWACCEL_YPAN)
149 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
150 struct fb_var_screeninfo *var,
151 struct fb_info *info)
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)
161 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
162 struct fb_var_screeninfo *var,
163 struct fb_info *info)
168 pixeloff = (var->xoffset * info->var.bits_per_pixel) & 0x1f;
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);
175 /* Update configuration */
176 lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
177 lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
178 | ATMEL_LCDC_DMAUPDT);
182 static u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
183 | ATMEL_LCDC_POL_POSITIVE
184 | ATMEL_LCDC_ENA_PWMENABLE;
186 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
188 /* some bl->props field just changed */
189 static int atmel_bl_update_status(struct backlight_device *bl)
191 struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
192 int power = sinfo->bl_power;
193 int brightness = bl->props.brightness;
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.
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;
204 if (brightness < 0 && power == FB_BLANK_UNBLANK)
205 brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
206 else if (power != FB_BLANK_UNBLANK)
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);
214 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
216 bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
221 static int atmel_bl_get_brightness(struct backlight_device *bl)
223 struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
225 return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
228 static const struct backlight_ops atmel_lcdc_bl_ops = {
229 .update_status = atmel_bl_update_status,
230 .get_brightness = atmel_bl_get_brightness,
233 static void init_backlight(struct atmel_lcdfb_info *sinfo)
235 struct backlight_properties props;
236 struct backlight_device *bl;
238 sinfo->bl_power = FB_BLANK_UNBLANK;
240 if (sinfo->backlight)
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);
249 dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n",
253 sinfo->backlight = bl;
255 bl->props.power = FB_BLANK_UNBLANK;
256 bl->props.fb_blank = FB_BLANK_UNBLANK;
257 bl->props.brightness = atmel_bl_get_brightness(bl);
260 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
262 if (!sinfo->backlight)
265 if (sinfo->backlight->ops) {
266 sinfo->backlight->props.power = FB_BLANK_POWERDOWN;
267 sinfo->backlight->ops->update_status(sinfo->backlight);
269 backlight_device_unregister(sinfo->backlight);
274 static void init_backlight(struct atmel_lcdfb_info *sinfo)
276 dev_warn(&sinfo->pdev->dev, "backlight control is not available\n");
279 static void exit_backlight(struct atmel_lcdfb_info *sinfo)
285 static void init_contrast(struct atmel_lcdfb_info *sinfo)
287 struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
289 /* contrast pwm can be 'inverted' */
290 if (pdata->lcdcon_pol_negative)
291 contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE);
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);
297 if (pdata->lcdcon_is_backlight)
298 init_backlight(sinfo);
301 static inline void atmel_lcdfb_power_control(struct atmel_lcdfb_info *sinfo, int on)
304 struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
306 if (pdata->atmel_lcdfb_power_control)
307 pdata->atmel_lcdfb_power_control(pdata, on);
308 else if (sinfo->reg_lcd) {
310 ret = regulator_enable(sinfo->reg_lcd);
312 dev_err(&sinfo->pdev->dev,
313 "lcd regulator enable failed: %d\n", ret);
315 ret = regulator_disable(sinfo->reg_lcd);
317 dev_err(&sinfo->pdev->dev,
318 "lcd regulator disable failed: %d\n", ret);
323 static const struct fb_fix_screeninfo atmel_lcdfb_fix __initconst = {
324 .type = FB_TYPE_PACKED_PIXELS,
325 .visual = FB_VISUAL_TRUECOLOR,
329 .accel = FB_ACCEL_NONE,
332 static unsigned long compute_hozval(struct atmel_lcdfb_info *sinfo,
335 unsigned long lcdcon2;
338 if (!sinfo->config->have_hozval)
341 lcdcon2 = lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2);
343 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) {
345 if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) {
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);
353 value = DIV_ROUND_UP(value, 8);
359 static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo)
361 struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
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);
367 /* Wait for the LCDC core to become idle */
368 while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY)
371 lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0);
374 static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo)
376 atmel_lcdfb_stop_nowait(sinfo);
378 /* Wait for DMA engine to become idle... */
379 while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
383 static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo)
385 struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
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)
393 static void atmel_lcdfb_update_dma(struct fb_info *info,
394 struct fb_var_screeninfo *var)
396 struct atmel_lcdfb_info *sinfo = info->par;
397 struct fb_fix_screeninfo *fix = &info->fix;
398 unsigned long dma_addr;
400 dma_addr = (fix->smem_start + var->yoffset * fix->line_length
401 + var->xoffset * info->var.bits_per_pixel / 8);
405 /* Set framebuffer DMA base address and pixel offset */
406 lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
408 atmel_lcdfb_update_dma2d(sinfo, var, info);
411 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
413 struct fb_info *info = sinfo->info;
415 dma_free_wc(info->device, info->fix.smem_len, info->screen_base,
416 info->fix.smem_start);
420 * atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
421 * @sinfo: the frame buffer to allocate memory for
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.
426 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo)
428 struct fb_info *info = sinfo->info;
429 struct fb_var_screeninfo *var = &info->var;
430 unsigned int smem_len;
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);
436 info->screen_base = dma_alloc_wc(info->device, info->fix.smem_len,
437 (dma_addr_t *)&info->fix.smem_start,
440 if (!info->screen_base) {
444 memset(info->screen_base, 0, info->fix.smem_len);
449 static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var,
450 struct fb_info *info)
452 struct fb_videomode varfbmode;
453 const struct fb_videomode *fbmode = NULL;
455 fb_var_to_videomode(&varfbmode, var);
456 fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist);
458 fb_videomode_to_var(var, fbmode);
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
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.
484 * Returns negative errno on error, or zero on success.
486 static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
487 struct fb_info *info)
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;
494 clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
496 dev_dbg(dev, "%s:\n", __func__);
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");
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);
511 if (PICOS2KHZ(var->pixclock) > clk_value_khz) {
512 dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock));
516 /* Do not allow to have real resoulution larger than virtual */
517 if (var->xres > var->xres_virtual)
518 var->xres_virtual = var->xres;
520 if (var->yres > var->yres_virtual)
521 var->yres_virtual = var->yres;
523 /* Force same alignment for each line */
524 var->xres = (var->xres + 3) & ~3UL;
525 var->xres_virtual = (var->xres_virtual + 3) & ~3UL;
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;
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);
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,
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,
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);
562 switch (var->bits_per_pixel) {
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;
572 /* Older SOCs use IBGR:555 rather than BGR:565. */
573 if (sinfo->config->have_intensity_bit)
574 var->green.length = 5;
576 var->green.length = 6;
578 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
580 var->red.offset = var->green.length + 5;
581 var->blue.offset = 0;
585 var->blue.offset = var->green.length + 5;
587 var->green.offset = 5;
588 var->red.length = var->blue.length = 5;
591 var->transp.offset = 24;
592 var->transp.length = 8;
595 if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
597 var->red.offset = 16;
598 var->blue.offset = 0;
602 var->blue.offset = 16;
604 var->green.offset = 8;
605 var->red.length = var->green.length = var->blue.length = 8;
608 dev_err(dev, "color depth %d not supported\n",
609 var->bits_per_pixel);
619 static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo)
623 atmel_lcdfb_stop(sinfo);
624 atmel_lcdfb_start(sinfo);
628 * atmel_lcdfb_set_par - Alters the hardware state.
629 * @info: frame buffer structure that represents a single frame buffer
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.
641 static int atmel_lcdfb_set_par(struct fb_info *info)
643 struct atmel_lcdfb_info *sinfo = info->par;
644 struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
645 unsigned long hozval_linesz;
647 unsigned long clk_value_khz;
648 unsigned long bits_per_line;
649 unsigned long pix_factor = 2;
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);
658 atmel_lcdfb_stop_nowait(sinfo);
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;
665 info->fix.visual = FB_VISUAL_TRUECOLOR;
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);
670 /* Re-initialize the DMA engine... */
671 dev_dbg(info->device, " * update DMA engine\n");
672 atmel_lcdfb_update_dma(info, &info->var);
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);
679 /* Now, the LCDC core... */
681 /* Set pixel clock */
682 if (sinfo->config->have_alt_pixclock)
685 clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000;
687 value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock));
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);
693 value = (value / pix_factor) - 1;
694 dev_dbg(info->device, " * programming CLKVAL = 0x%08lx\n",
696 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1,
697 value << ATMEL_LCDC_CLKVAL_OFFSET);
699 KHZ2PICOS(clk_value_khz / (pix_factor * (value + 1)));
700 dev_dbg(info->device, " updated pixclk: %lu KHz\n",
701 PICOS2KHZ(info->var.pixclock));
705 /* Initialize control register 2 */
706 value = pdata->default_lcdcon2;
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;
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;
724 dev_dbg(info->device, " * LCDCON2 = %08lx\n", value);
725 lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value);
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);
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);
741 /* Horizontal value (aka line size) */
742 hozval_linesz = compute_hozval(sinfo, info->var.xres);
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);
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);
754 /* Toggle LCD_MODE every frame */
755 lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0);
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);
762 /* ...wait for DMA engine to become idle... */
763 while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY)
766 atmel_lcdfb_start(sinfo);
768 dev_dbg(info->device, " * DONE\n");
773 static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf)
776 chan >>= 16 - bf->length;
777 return chan << bf->offset;
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
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.
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
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)
809 struct atmel_lcdfb_info *sinfo = info->par;
810 struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
815 if (info->var.grayscale)
816 red = green = blue = (19595 * red + 38470 * green
817 + 7471 * blue) >> 16;
819 switch (info->fix.visual) {
820 case FB_VISUAL_TRUECOLOR:
822 pal = info->pseudo_palette;
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);
833 case FB_VISUAL_PSEUDOCOLOR:
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);
842 * TODO: intensity bit. Maybe something like
843 * ~(red[10] ^ green[10] ^ blue[10]) & 1
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);
851 val = ((red >> 11) & 0x001f);
852 val |= ((blue >> 0) & 0xf800);
855 val |= ((green >> 5) & 0x07e0);
858 lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
863 case FB_VISUAL_MONO01:
865 val = (regno == 0) ? 0x00 : 0x1F;
866 lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val);
876 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var,
877 struct fb_info *info)
879 dev_dbg(info->device, "%s\n", __func__);
881 atmel_lcdfb_update_dma(info, var);
886 static int atmel_lcdfb_blank(int blank_mode, struct fb_info *info)
888 struct atmel_lcdfb_info *sinfo = info->par;
890 switch (blank_mode) {
891 case FB_BLANK_UNBLANK:
892 case FB_BLANK_NORMAL:
893 atmel_lcdfb_start(sinfo);
895 case FB_BLANK_VSYNC_SUSPEND:
896 case FB_BLANK_HSYNC_SUSPEND:
898 case FB_BLANK_POWERDOWN:
899 atmel_lcdfb_stop(sinfo);
905 /* let fbcon do a soft blank for us */
906 return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
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,
921 static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id)
923 struct fb_info *info = dev_id;
924 struct atmel_lcdfb_info *sinfo = info->par;
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);
933 lcdc_writel(sinfo, ATMEL_LCDC_ICR, status);
938 * LCD controller task (to reset the LCD)
940 static void atmel_lcdfb_task(struct work_struct *work)
942 struct atmel_lcdfb_info *sinfo =
943 container_of(work, struct atmel_lcdfb_info, task);
945 atmel_lcdfb_reset(sinfo);
948 static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo)
950 struct fb_info *info = sinfo->info;
953 info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
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,
961 /* Allocate colormap */
962 ret = fb_alloc_cmap(&info->cmap, 256, 0);
964 dev_err(info->device, "Alloc color map failed\n");
969 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo)
971 clk_prepare_enable(sinfo->bus_clk);
972 clk_prepare_enable(sinfo->lcdc_clk);
975 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
977 clk_disable_unprepare(sinfo->bus_clk);
978 clk_disable_unprepare(sinfo->lcdc_clk);
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, },
993 MODULE_DEVICE_TABLE(of, atmel_lcdfb_dt_ids);
995 static const char *atmel_lcdfb_wiring_modes[] = {
996 [ATMEL_LCDC_WIRING_BGR] = "BRG",
997 [ATMEL_LCDC_WIRING_RGB] = "RGB",
1000 static int atmel_lcdfb_get_of_wiring_modes(struct device_node *np)
1005 err = of_property_read_string(np, "atmel,lcd-wiring-mode", &mode);
1007 return ATMEL_LCDC_WIRING_BGR;
1009 for (i = 0; i < ARRAY_SIZE(atmel_lcdfb_wiring_modes); i++)
1010 if (!strcasecmp(mode, atmel_lcdfb_wiring_modes[i]))
1016 static void atmel_lcdfb_power_control_gpio(struct atmel_lcdfb_pdata *pdata, int on)
1018 struct atmel_lcdfb_power_ctrl_gpio *og;
1020 list_for_each_entry(og, &pdata->pwr_gpios, list)
1021 gpiod_set_value(og->gpiod, on);
1024 static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
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 atmel_lcdfb_power_ctrl_gpio *og;
1033 bool is_gpio_power = false;
1034 struct fb_videomode fb_vm;
1035 struct gpio_desc *gpiod;
1036 struct videomode vm;
1040 sinfo->config = (struct atmel_lcdfb_config*)
1041 of_match_device(atmel_lcdfb_dt_ids, dev)->data;
1043 display_np = of_parse_phandle(np, "display", 0);
1045 dev_err(dev, "failed to find display phandle\n");
1049 ret = of_property_read_u32(display_np, "bits-per-pixel", &var->bits_per_pixel);
1051 dev_err(dev, "failed to get property bits-per-pixel\n");
1052 goto put_display_node;
1055 ret = of_property_read_u32(display_np, "atmel,guard-time", &pdata->guard_time);
1057 dev_err(dev, "failed to get property atmel,guard-time\n");
1058 goto put_display_node;
1061 ret = of_property_read_u32(display_np, "atmel,lcdcon2", &pdata->default_lcdcon2);
1063 dev_err(dev, "failed to get property atmel,lcdcon2\n");
1064 goto put_display_node;
1067 ret = of_property_read_u32(display_np, "atmel,dmacon", &pdata->default_dmacon);
1069 dev_err(dev, "failed to get property bits-per-pixel\n");
1070 goto put_display_node;
1073 INIT_LIST_HEAD(&pdata->pwr_gpios);
1075 for (i = 0; i < gpiod_count(dev, "atmel,power-control"); i++) {
1076 gpiod = devm_gpiod_get_index(dev, "atmel,power-control",
1081 og = devm_kzalloc(dev, sizeof(*og), GFP_KERNEL);
1083 goto put_display_node;
1086 is_gpio_power = true;
1088 ret = gpiod_direction_output(gpiod, gpiod_is_active_low(gpiod));
1090 dev_err(dev, "set direction output gpio atmel,power-control[%d] failed\n", i);
1091 goto put_display_node;
1093 list_add(&og->list, &pdata->pwr_gpios);
1097 pdata->atmel_lcdfb_power_control = atmel_lcdfb_power_control_gpio;
1099 ret = atmel_lcdfb_get_of_wiring_modes(display_np);
1101 dev_err(dev, "invalid atmel,lcd-wiring-mode\n");
1102 goto put_display_node;
1104 pdata->lcd_wiring_mode = ret;
1106 pdata->lcdcon_is_backlight = of_property_read_bool(display_np, "atmel,lcdcon-backlight");
1107 pdata->lcdcon_pol_negative = of_property_read_bool(display_np, "atmel,lcdcon-backlight-inverted");
1109 ret = of_get_videomode(display_np, &vm, OF_USE_NATIVE_MODE);
1111 dev_err(dev, "failed to get videomode from DT\n");
1112 goto put_display_node;
1115 ret = fb_videomode_from_videomode(&vm, &fb_vm);
1117 goto put_display_node;
1119 fb_add_videomode(&fb_vm, &info->modelist);
1122 of_node_put(display_np);
1126 static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
1132 static int __init atmel_lcdfb_probe(struct platform_device *pdev)
1134 struct device *dev = &pdev->dev;
1135 struct fb_info *info;
1136 struct atmel_lcdfb_info *sinfo;
1137 struct atmel_lcdfb_pdata *pdata = NULL;
1138 struct resource *regs = NULL;
1139 struct resource *map = NULL;
1140 struct fb_modelist *modelist;
1143 dev_dbg(dev, "%s BEGIN\n", __func__);
1146 info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
1148 dev_err(dev, "cannot allocate memory\n");
1156 INIT_LIST_HEAD(&info->modelist);
1158 if (pdev->dev.of_node) {
1159 ret = atmel_lcdfb_of_init(sinfo);
1162 } else if (dev_get_platdata(dev)) {
1163 struct fb_monspecs *monspecs;
1166 pdata = dev_get_platdata(dev);
1167 monspecs = pdata->default_monspecs;
1168 sinfo->pdata = *pdata;
1170 for (i = 0; i < monspecs->modedb_len; i++)
1171 fb_add_videomode(&monspecs->modedb[i], &info->modelist);
1173 sinfo->config = atmel_lcdfb_get_config(pdev);
1175 info->var.bits_per_pixel = pdata->default_bpp ? pdata->default_bpp : 16;
1176 memcpy(&info->monspecs, pdata->default_monspecs, sizeof(info->monspecs));
1178 dev_err(dev, "cannot get default configuration\n");
1185 sinfo->reg_lcd = devm_regulator_get(&pdev->dev, "lcd");
1186 if (IS_ERR(sinfo->reg_lcd))
1187 sinfo->reg_lcd = NULL;
1189 info->flags = ATMEL_LCDFB_FBINFO_DEFAULT;
1190 info->pseudo_palette = sinfo->pseudo_palette;
1191 info->fbops = &atmel_lcdfb_ops;
1193 info->fix = atmel_lcdfb_fix;
1194 strcpy(info->fix.id, sinfo->pdev->name);
1196 /* Enable LCDC Clocks */
1197 sinfo->bus_clk = clk_get(dev, "hclk");
1198 if (IS_ERR(sinfo->bus_clk)) {
1199 ret = PTR_ERR(sinfo->bus_clk);
1202 sinfo->lcdc_clk = clk_get(dev, "lcdc_clk");
1203 if (IS_ERR(sinfo->lcdc_clk)) {
1204 ret = PTR_ERR(sinfo->lcdc_clk);
1207 atmel_lcdfb_start_clock(sinfo);
1209 modelist = list_first_entry(&info->modelist,
1210 struct fb_modelist, list);
1211 fb_videomode_to_var(&info->var, &modelist->mode);
1213 atmel_lcdfb_check_var(&info->var, info);
1215 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1217 dev_err(dev, "resources unusable\n");
1222 sinfo->irq_base = platform_get_irq(pdev, 0);
1223 if (sinfo->irq_base < 0) {
1224 dev_err(dev, "unable to get irq\n");
1225 ret = sinfo->irq_base;
1229 /* Initialize video memory */
1230 map = platform_get_resource(pdev, IORESOURCE_MEM, 1);
1232 /* use a pre-allocated memory buffer */
1233 info->fix.smem_start = map->start;
1234 info->fix.smem_len = resource_size(map);
1235 if (!request_mem_region(info->fix.smem_start,
1236 info->fix.smem_len, pdev->name)) {
1241 info->screen_base = ioremap_wc(info->fix.smem_start,
1242 info->fix.smem_len);
1243 if (!info->screen_base) {
1245 goto release_intmem;
1249 * Don't clear the framebuffer -- someone may have set
1250 * up a splash image.
1253 /* allocate memory buffer */
1254 ret = atmel_lcdfb_alloc_video_memory(sinfo);
1256 dev_err(dev, "cannot allocate framebuffer: %d\n", ret);
1261 /* LCDC registers */
1262 info->fix.mmio_start = regs->start;
1263 info->fix.mmio_len = resource_size(regs);
1265 if (!request_mem_region(info->fix.mmio_start,
1266 info->fix.mmio_len, pdev->name)) {
1271 sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len);
1273 dev_err(dev, "cannot map LCDC registers\n");
1278 /* Initialize PWM for contrast or backlight ("off") */
1279 init_contrast(sinfo);
1282 ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info);
1284 dev_err(dev, "request_irq failed: %d\n", ret);
1288 /* Some operations on the LCDC might sleep and
1289 * require a preemptible task context */
1290 INIT_WORK(&sinfo->task, atmel_lcdfb_task);
1292 ret = atmel_lcdfb_init_fbinfo(sinfo);
1294 dev_err(dev, "init fbinfo failed: %d\n", ret);
1295 goto unregister_irqs;
1298 ret = atmel_lcdfb_set_par(info);
1300 dev_err(dev, "set par failed: %d\n", ret);
1301 goto unregister_irqs;
1304 dev_set_drvdata(dev, info);
1307 * Tell the world that we're ready to go
1309 ret = register_framebuffer(info);
1311 dev_err(dev, "failed to register framebuffer device: %d\n", ret);
1315 /* Power up the LCDC screen */
1316 atmel_lcdfb_power_control(sinfo, 1);
1318 dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n",
1319 info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base);
1324 dev_set_drvdata(dev, NULL);
1325 fb_dealloc_cmap(&info->cmap);
1327 cancel_work_sync(&sinfo->task);
1328 free_irq(sinfo->irq_base, info);
1330 exit_backlight(sinfo);
1331 iounmap(sinfo->mmio);
1333 release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1336 iounmap(info->screen_base);
1338 atmel_lcdfb_free_video_memory(sinfo);
1342 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1344 atmel_lcdfb_stop_clock(sinfo);
1345 clk_put(sinfo->lcdc_clk);
1347 clk_put(sinfo->bus_clk);
1349 framebuffer_release(info);
1351 dev_dbg(dev, "%s FAILED\n", __func__);
1355 static int __exit atmel_lcdfb_remove(struct platform_device *pdev)
1357 struct device *dev = &pdev->dev;
1358 struct fb_info *info = dev_get_drvdata(dev);
1359 struct atmel_lcdfb_info *sinfo;
1360 struct atmel_lcdfb_pdata *pdata;
1362 if (!info || !info->par)
1365 pdata = &sinfo->pdata;
1367 cancel_work_sync(&sinfo->task);
1368 exit_backlight(sinfo);
1369 atmel_lcdfb_power_control(sinfo, 0);
1370 unregister_framebuffer(info);
1371 atmel_lcdfb_stop_clock(sinfo);
1372 clk_put(sinfo->lcdc_clk);
1373 clk_put(sinfo->bus_clk);
1374 fb_dealloc_cmap(&info->cmap);
1375 free_irq(sinfo->irq_base, info);
1376 iounmap(sinfo->mmio);
1377 release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
1378 if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) {
1379 iounmap(info->screen_base);
1380 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1382 atmel_lcdfb_free_video_memory(sinfo);
1385 framebuffer_release(info);
1392 static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg)
1394 struct fb_info *info = platform_get_drvdata(pdev);
1395 struct atmel_lcdfb_info *sinfo = info->par;
1398 * We don't want to handle interrupts while the clock is
1399 * stopped. It may take forever.
1401 lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL);
1403 sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_CTR);
1404 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
1405 atmel_lcdfb_power_control(sinfo, 0);
1406 atmel_lcdfb_stop(sinfo);
1407 atmel_lcdfb_stop_clock(sinfo);
1412 static int atmel_lcdfb_resume(struct platform_device *pdev)
1414 struct fb_info *info = platform_get_drvdata(pdev);
1415 struct atmel_lcdfb_info *sinfo = info->par;
1417 atmel_lcdfb_start_clock(sinfo);
1418 atmel_lcdfb_start(sinfo);
1419 atmel_lcdfb_power_control(sinfo, 1);
1420 lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon);
1422 /* Enable FIFO & DMA errors */
1423 lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI
1424 | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI);
1430 #define atmel_lcdfb_suspend NULL
1431 #define atmel_lcdfb_resume NULL
1434 static struct platform_driver atmel_lcdfb_driver = {
1435 .remove = __exit_p(atmel_lcdfb_remove),
1436 .suspend = atmel_lcdfb_suspend,
1437 .resume = atmel_lcdfb_resume,
1438 .id_table = atmel_lcdfb_devtypes,
1440 .name = "atmel_lcdfb",
1441 .of_match_table = of_match_ptr(atmel_lcdfb_dt_ids),
1445 module_platform_driver_probe(atmel_lcdfb_driver, atmel_lcdfb_probe);
1447 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1448 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1449 MODULE_LICENSE("GPL");