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/module.h>
22 #include <linux/platform_data/atmel.h>
27 #include <video/atmel_lcdc.h>
29 #define lcdc_readl(sinfo, reg) __raw_readl((sinfo)->mmio+(reg))
30 #define lcdc_writel(sinfo, reg, val) __raw_writel((val), (sinfo)->mmio+(reg))
32 /* configurable parameters */
33 #define ATMEL_LCDC_CVAL_DEFAULT 0xc8
34 #define ATMEL_LCDC_DMA_BURST_LEN 8 /* words */
35 #define ATMEL_LCDC_FIFO_SIZE 512 /* words */
37 struct atmel_lcdfb_config
{
38 bool have_alt_pixclock
;
40 bool have_intensity_bit
;
43 static struct atmel_lcdfb_config at91sam9261_config
= {
45 .have_intensity_bit
= true,
48 static struct atmel_lcdfb_config at91sam9263_config
= {
49 .have_intensity_bit
= true,
52 static struct atmel_lcdfb_config at91sam9g10_config
= {
56 static struct atmel_lcdfb_config at91sam9g45_config
= {
57 .have_alt_pixclock
= true,
60 static struct atmel_lcdfb_config at91sam9g45es_config
= {
63 static struct atmel_lcdfb_config at91sam9rl_config
= {
64 .have_intensity_bit
= true,
67 static struct atmel_lcdfb_config at32ap_config
= {
71 static const struct platform_device_id atmel_lcdfb_devtypes
[] = {
73 .name
= "at91sam9261-lcdfb",
74 .driver_data
= (unsigned long)&at91sam9261_config
,
76 .name
= "at91sam9263-lcdfb",
77 .driver_data
= (unsigned long)&at91sam9263_config
,
79 .name
= "at91sam9g10-lcdfb",
80 .driver_data
= (unsigned long)&at91sam9g10_config
,
82 .name
= "at91sam9g45-lcdfb",
83 .driver_data
= (unsigned long)&at91sam9g45_config
,
85 .name
= "at91sam9g45es-lcdfb",
86 .driver_data
= (unsigned long)&at91sam9g45es_config
,
88 .name
= "at91sam9rl-lcdfb",
89 .driver_data
= (unsigned long)&at91sam9rl_config
,
91 .name
= "at32ap-lcdfb",
92 .driver_data
= (unsigned long)&at32ap_config
,
98 static struct atmel_lcdfb_config
*
99 atmel_lcdfb_get_config(struct platform_device
*pdev
)
103 data
= platform_get_device_id(pdev
)->driver_data
;
105 return (struct atmel_lcdfb_config
*)data
;
108 #if defined(CONFIG_ARCH_AT91)
109 #define ATMEL_LCDFB_FBINFO_DEFAULT (FBINFO_DEFAULT \
110 | FBINFO_PARTIAL_PAN_OK \
111 | FBINFO_HWACCEL_YPAN)
113 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info
*sinfo
,
114 struct fb_var_screeninfo
*var
,
115 struct fb_info
*info
)
119 #elif defined(CONFIG_AVR32)
120 #define ATMEL_LCDFB_FBINFO_DEFAULT (FBINFO_DEFAULT \
121 | FBINFO_PARTIAL_PAN_OK \
122 | FBINFO_HWACCEL_XPAN \
123 | FBINFO_HWACCEL_YPAN)
125 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info
*sinfo
,
126 struct fb_var_screeninfo
*var
,
127 struct fb_info
*info
)
132 pixeloff
= (var
->xoffset
* info
->var
.bits_per_pixel
) & 0x1f;
134 dma2dcfg
= (info
->var
.xres_virtual
- info
->var
.xres
)
135 * info
->var
.bits_per_pixel
/ 8;
136 dma2dcfg
|= pixeloff
<< ATMEL_LCDC_PIXELOFF_OFFSET
;
137 lcdc_writel(sinfo
, ATMEL_LCDC_DMA2DCFG
, dma2dcfg
);
139 /* Update configuration */
140 lcdc_writel(sinfo
, ATMEL_LCDC_DMACON
,
141 lcdc_readl(sinfo
, ATMEL_LCDC_DMACON
)
142 | ATMEL_LCDC_DMAUPDT
);
146 static u32 contrast_ctr
= ATMEL_LCDC_PS_DIV8
147 | ATMEL_LCDC_POL_POSITIVE
148 | ATMEL_LCDC_ENA_PWMENABLE
;
150 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
152 /* some bl->props field just changed */
153 static int atmel_bl_update_status(struct backlight_device
*bl
)
155 struct atmel_lcdfb_info
*sinfo
= bl_get_data(bl
);
156 int power
= sinfo
->bl_power
;
157 int brightness
= bl
->props
.brightness
;
159 /* REVISIT there may be a meaningful difference between
160 * fb_blank and power ... there seem to be some cases
161 * this doesn't handle correctly.
163 if (bl
->props
.fb_blank
!= sinfo
->bl_power
)
164 power
= bl
->props
.fb_blank
;
165 else if (bl
->props
.power
!= sinfo
->bl_power
)
166 power
= bl
->props
.power
;
168 if (brightness
< 0 && power
== FB_BLANK_UNBLANK
)
169 brightness
= lcdc_readl(sinfo
, ATMEL_LCDC_CONTRAST_VAL
);
170 else if (power
!= FB_BLANK_UNBLANK
)
173 lcdc_writel(sinfo
, ATMEL_LCDC_CONTRAST_VAL
, brightness
);
174 if (contrast_ctr
& ATMEL_LCDC_POL_POSITIVE
)
175 lcdc_writel(sinfo
, ATMEL_LCDC_CONTRAST_CTR
,
176 brightness
? contrast_ctr
: 0);
178 lcdc_writel(sinfo
, ATMEL_LCDC_CONTRAST_CTR
, contrast_ctr
);
180 bl
->props
.fb_blank
= bl
->props
.power
= sinfo
->bl_power
= power
;
185 static int atmel_bl_get_brightness(struct backlight_device
*bl
)
187 struct atmel_lcdfb_info
*sinfo
= bl_get_data(bl
);
189 return lcdc_readl(sinfo
, ATMEL_LCDC_CONTRAST_VAL
);
192 static const struct backlight_ops atmel_lcdc_bl_ops
= {
193 .update_status
= atmel_bl_update_status
,
194 .get_brightness
= atmel_bl_get_brightness
,
197 static void init_backlight(struct atmel_lcdfb_info
*sinfo
)
199 struct backlight_properties props
;
200 struct backlight_device
*bl
;
202 sinfo
->bl_power
= FB_BLANK_UNBLANK
;
204 if (sinfo
->backlight
)
207 memset(&props
, 0, sizeof(struct backlight_properties
));
208 props
.type
= BACKLIGHT_RAW
;
209 props
.max_brightness
= 0xff;
210 bl
= backlight_device_register("backlight", &sinfo
->pdev
->dev
, sinfo
,
211 &atmel_lcdc_bl_ops
, &props
);
213 dev_err(&sinfo
->pdev
->dev
, "error %ld on backlight register\n",
217 sinfo
->backlight
= bl
;
219 bl
->props
.power
= FB_BLANK_UNBLANK
;
220 bl
->props
.fb_blank
= FB_BLANK_UNBLANK
;
221 bl
->props
.brightness
= atmel_bl_get_brightness(bl
);
224 static void exit_backlight(struct atmel_lcdfb_info
*sinfo
)
226 if (sinfo
->backlight
)
227 backlight_device_unregister(sinfo
->backlight
);
232 static void init_backlight(struct atmel_lcdfb_info
*sinfo
)
234 dev_warn(&sinfo
->pdev
->dev
, "backlight control is not available\n");
237 static void exit_backlight(struct atmel_lcdfb_info
*sinfo
)
243 static void init_contrast(struct atmel_lcdfb_info
*sinfo
)
245 /* contrast pwm can be 'inverted' */
246 if (sinfo
->lcdcon_pol_negative
)
247 contrast_ctr
&= ~(ATMEL_LCDC_POL_POSITIVE
);
249 /* have some default contrast/backlight settings */
250 lcdc_writel(sinfo
, ATMEL_LCDC_CONTRAST_CTR
, contrast_ctr
);
251 lcdc_writel(sinfo
, ATMEL_LCDC_CONTRAST_VAL
, ATMEL_LCDC_CVAL_DEFAULT
);
253 if (sinfo
->lcdcon_is_backlight
)
254 init_backlight(sinfo
);
258 static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata
= {
259 .type
= FB_TYPE_PACKED_PIXELS
,
260 .visual
= FB_VISUAL_TRUECOLOR
,
264 .accel
= FB_ACCEL_NONE
,
267 static unsigned long compute_hozval(struct atmel_lcdfb_info
*sinfo
,
270 unsigned long lcdcon2
;
273 if (!sinfo
->config
->have_hozval
)
276 lcdcon2
= lcdc_readl(sinfo
, ATMEL_LCDC_LCDCON2
);
278 if ((lcdcon2
& ATMEL_LCDC_DISTYPE
) != ATMEL_LCDC_DISTYPE_TFT
) {
280 if ((lcdcon2
& ATMEL_LCDC_DISTYPE
) == ATMEL_LCDC_DISTYPE_STNCOLOR
) {
283 if ( (lcdcon2
& ATMEL_LCDC_IFWIDTH
) == ATMEL_LCDC_IFWIDTH_4
284 || ( (lcdcon2
& ATMEL_LCDC_IFWIDTH
) == ATMEL_LCDC_IFWIDTH_8
285 && (lcdcon2
& ATMEL_LCDC_SCANMOD
) == ATMEL_LCDC_SCANMOD_DUAL
))
286 value
= DIV_ROUND_UP(value
, 4);
288 value
= DIV_ROUND_UP(value
, 8);
294 static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info
*sinfo
)
296 /* Turn off the LCD controller and the DMA controller */
297 lcdc_writel(sinfo
, ATMEL_LCDC_PWRCON
,
298 sinfo
->guard_time
<< ATMEL_LCDC_GUARDT_OFFSET
);
300 /* Wait for the LCDC core to become idle */
301 while (lcdc_readl(sinfo
, ATMEL_LCDC_PWRCON
) & ATMEL_LCDC_BUSY
)
304 lcdc_writel(sinfo
, ATMEL_LCDC_DMACON
, 0);
307 static void atmel_lcdfb_stop(struct atmel_lcdfb_info
*sinfo
)
309 atmel_lcdfb_stop_nowait(sinfo
);
311 /* Wait for DMA engine to become idle... */
312 while (lcdc_readl(sinfo
, ATMEL_LCDC_DMACON
) & ATMEL_LCDC_DMABUSY
)
316 static void atmel_lcdfb_start(struct atmel_lcdfb_info
*sinfo
)
318 lcdc_writel(sinfo
, ATMEL_LCDC_DMACON
, sinfo
->default_dmacon
);
319 lcdc_writel(sinfo
, ATMEL_LCDC_PWRCON
,
320 (sinfo
->guard_time
<< ATMEL_LCDC_GUARDT_OFFSET
)
324 static void atmel_lcdfb_update_dma(struct fb_info
*info
,
325 struct fb_var_screeninfo
*var
)
327 struct atmel_lcdfb_info
*sinfo
= info
->par
;
328 struct fb_fix_screeninfo
*fix
= &info
->fix
;
329 unsigned long dma_addr
;
331 dma_addr
= (fix
->smem_start
+ var
->yoffset
* fix
->line_length
332 + var
->xoffset
* info
->var
.bits_per_pixel
/ 8);
336 /* Set framebuffer DMA base address and pixel offset */
337 lcdc_writel(sinfo
, ATMEL_LCDC_DMABADDR1
, dma_addr
);
339 atmel_lcdfb_update_dma2d(sinfo
, var
, info
);
342 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info
*sinfo
)
344 struct fb_info
*info
= sinfo
->info
;
346 dma_free_writecombine(info
->device
, info
->fix
.smem_len
,
347 info
->screen_base
, info
->fix
.smem_start
);
351 * atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
352 * @sinfo: the frame buffer to allocate memory for
354 * This function is called only from the atmel_lcdfb_probe()
355 * so no locking by fb_info->mm_lock around smem_len setting is needed.
357 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info
*sinfo
)
359 struct fb_info
*info
= sinfo
->info
;
360 struct fb_var_screeninfo
*var
= &info
->var
;
361 unsigned int smem_len
;
363 smem_len
= (var
->xres_virtual
* var
->yres_virtual
364 * ((var
->bits_per_pixel
+ 7) / 8));
365 info
->fix
.smem_len
= max(smem_len
, sinfo
->smem_len
);
367 info
->screen_base
= dma_alloc_writecombine(info
->device
, info
->fix
.smem_len
,
368 (dma_addr_t
*)&info
->fix
.smem_start
, GFP_KERNEL
);
370 if (!info
->screen_base
) {
374 memset(info
->screen_base
, 0, info
->fix
.smem_len
);
379 static const struct fb_videomode
*atmel_lcdfb_choose_mode(struct fb_var_screeninfo
*var
,
380 struct fb_info
*info
)
382 struct fb_videomode varfbmode
;
383 const struct fb_videomode
*fbmode
= NULL
;
385 fb_var_to_videomode(&varfbmode
, var
);
386 fbmode
= fb_find_nearest_mode(&varfbmode
, &info
->modelist
);
388 fb_videomode_to_var(var
, fbmode
);
394 * atmel_lcdfb_check_var - Validates a var passed in.
395 * @var: frame buffer variable screen structure
396 * @info: frame buffer structure that represents a single frame buffer
398 * Checks to see if the hardware supports the state requested by
399 * var passed in. This function does not alter the hardware
400 * state!!! This means the data stored in struct fb_info and
401 * struct atmel_lcdfb_info do not change. This includes the var
402 * inside of struct fb_info. Do NOT change these. This function
403 * can be called on its own if we intent to only test a mode and
404 * not actually set it. The stuff in modedb.c is a example of
405 * this. If the var passed in is slightly off by what the
406 * hardware can support then we alter the var PASSED in to what
407 * we can do. If the hardware doesn't support mode change a
408 * -EINVAL will be returned by the upper layers. You don't need
409 * to implement this function then. If you hardware doesn't
410 * support changing the resolution then this function is not
411 * needed. In this case the driver would just provide a var that
412 * represents the static state the screen is in.
414 * Returns negative errno on error, or zero on success.
416 static int atmel_lcdfb_check_var(struct fb_var_screeninfo
*var
,
417 struct fb_info
*info
)
419 struct device
*dev
= info
->device
;
420 struct atmel_lcdfb_info
*sinfo
= info
->par
;
421 unsigned long clk_value_khz
;
423 clk_value_khz
= clk_get_rate(sinfo
->lcdc_clk
) / 1000;
425 dev_dbg(dev
, "%s:\n", __func__
);
427 if (!(var
->pixclock
&& var
->bits_per_pixel
)) {
428 /* choose a suitable mode if possible */
429 if (!atmel_lcdfb_choose_mode(var
, info
)) {
430 dev_err(dev
, "needed value not specified\n");
435 dev_dbg(dev
, " resolution: %ux%u\n", var
->xres
, var
->yres
);
436 dev_dbg(dev
, " pixclk: %lu KHz\n", PICOS2KHZ(var
->pixclock
));
437 dev_dbg(dev
, " bpp: %u\n", var
->bits_per_pixel
);
438 dev_dbg(dev
, " clk: %lu KHz\n", clk_value_khz
);
440 if (PICOS2KHZ(var
->pixclock
) > clk_value_khz
) {
441 dev_err(dev
, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var
->pixclock
));
445 /* Do not allow to have real resoulution larger than virtual */
446 if (var
->xres
> var
->xres_virtual
)
447 var
->xres_virtual
= var
->xres
;
449 if (var
->yres
> var
->yres_virtual
)
450 var
->yres_virtual
= var
->yres
;
452 /* Force same alignment for each line */
453 var
->xres
= (var
->xres
+ 3) & ~3UL;
454 var
->xres_virtual
= (var
->xres_virtual
+ 3) & ~3UL;
456 var
->red
.msb_right
= var
->green
.msb_right
= var
->blue
.msb_right
= 0;
457 var
->transp
.msb_right
= 0;
458 var
->transp
.offset
= var
->transp
.length
= 0;
459 var
->xoffset
= var
->yoffset
= 0;
461 if (info
->fix
.smem_len
) {
462 unsigned int smem_len
= (var
->xres_virtual
* var
->yres_virtual
463 * ((var
->bits_per_pixel
+ 7) / 8));
464 if (smem_len
> info
->fix
.smem_len
)
468 /* Saturate vertical and horizontal timings at maximum values */
469 var
->vsync_len
= min_t(u32
, var
->vsync_len
,
470 (ATMEL_LCDC_VPW
>> ATMEL_LCDC_VPW_OFFSET
) + 1);
471 var
->upper_margin
= min_t(u32
, var
->upper_margin
,
472 ATMEL_LCDC_VBP
>> ATMEL_LCDC_VBP_OFFSET
);
473 var
->lower_margin
= min_t(u32
, var
->lower_margin
,
475 var
->right_margin
= min_t(u32
, var
->right_margin
,
476 (ATMEL_LCDC_HFP
>> ATMEL_LCDC_HFP_OFFSET
) + 1);
477 var
->hsync_len
= min_t(u32
, var
->hsync_len
,
478 (ATMEL_LCDC_HPW
>> ATMEL_LCDC_HPW_OFFSET
) + 1);
479 var
->left_margin
= min_t(u32
, var
->left_margin
,
482 /* Some parameters can't be zero */
483 var
->vsync_len
= max_t(u32
, var
->vsync_len
, 1);
484 var
->right_margin
= max_t(u32
, var
->right_margin
, 1);
485 var
->hsync_len
= max_t(u32
, var
->hsync_len
, 1);
486 var
->left_margin
= max_t(u32
, var
->left_margin
, 1);
488 switch (var
->bits_per_pixel
) {
493 var
->red
.offset
= var
->green
.offset
= var
->blue
.offset
= 0;
494 var
->red
.length
= var
->green
.length
= var
->blue
.length
495 = var
->bits_per_pixel
;
498 /* Older SOCs use IBGR:555 rather than BGR:565. */
499 if (sinfo
->config
->have_intensity_bit
)
500 var
->green
.length
= 5;
502 var
->green
.length
= 6;
504 if (sinfo
->lcd_wiring_mode
== ATMEL_LCDC_WIRING_RGB
) {
506 var
->red
.offset
= var
->green
.length
+ 5;
507 var
->blue
.offset
= 0;
511 var
->blue
.offset
= var
->green
.length
+ 5;
513 var
->green
.offset
= 5;
514 var
->red
.length
= var
->blue
.length
= 5;
517 var
->transp
.offset
= 24;
518 var
->transp
.length
= 8;
521 if (sinfo
->lcd_wiring_mode
== ATMEL_LCDC_WIRING_RGB
) {
523 var
->red
.offset
= 16;
524 var
->blue
.offset
= 0;
528 var
->blue
.offset
= 16;
530 var
->green
.offset
= 8;
531 var
->red
.length
= var
->green
.length
= var
->blue
.length
= 8;
534 dev_err(dev
, "color depth %d not supported\n",
535 var
->bits_per_pixel
);
545 static void atmel_lcdfb_reset(struct atmel_lcdfb_info
*sinfo
)
549 atmel_lcdfb_stop(sinfo
);
550 atmel_lcdfb_start(sinfo
);
554 * atmel_lcdfb_set_par - Alters the hardware state.
555 * @info: frame buffer structure that represents a single frame buffer
557 * Using the fb_var_screeninfo in fb_info we set the resolution
558 * of the this particular framebuffer. This function alters the
559 * par AND the fb_fix_screeninfo stored in fb_info. It doesn't
560 * not alter var in fb_info since we are using that data. This
561 * means we depend on the data in var inside fb_info to be
562 * supported by the hardware. atmel_lcdfb_check_var is always called
563 * before atmel_lcdfb_set_par to ensure this. Again if you can't
564 * change the resolution you don't need this function.
567 static int atmel_lcdfb_set_par(struct fb_info
*info
)
569 struct atmel_lcdfb_info
*sinfo
= info
->par
;
570 unsigned long hozval_linesz
;
572 unsigned long clk_value_khz
;
573 unsigned long bits_per_line
;
574 unsigned long pix_factor
= 2;
578 dev_dbg(info
->device
, "%s:\n", __func__
);
579 dev_dbg(info
->device
, " * resolution: %ux%u (%ux%u virtual)\n",
580 info
->var
.xres
, info
->var
.yres
,
581 info
->var
.xres_virtual
, info
->var
.yres_virtual
);
583 atmel_lcdfb_stop_nowait(sinfo
);
585 if (info
->var
.bits_per_pixel
== 1)
586 info
->fix
.visual
= FB_VISUAL_MONO01
;
587 else if (info
->var
.bits_per_pixel
<= 8)
588 info
->fix
.visual
= FB_VISUAL_PSEUDOCOLOR
;
590 info
->fix
.visual
= FB_VISUAL_TRUECOLOR
;
592 bits_per_line
= info
->var
.xres_virtual
* info
->var
.bits_per_pixel
;
593 info
->fix
.line_length
= DIV_ROUND_UP(bits_per_line
, 8);
595 /* Re-initialize the DMA engine... */
596 dev_dbg(info
->device
, " * update DMA engine\n");
597 atmel_lcdfb_update_dma(info
, &info
->var
);
599 /* ...set frame size and burst length = 8 words (?) */
600 value
= (info
->var
.yres
* info
->var
.xres
* info
->var
.bits_per_pixel
) / 32;
601 value
|= ((ATMEL_LCDC_DMA_BURST_LEN
- 1) << ATMEL_LCDC_BLENGTH_OFFSET
);
602 lcdc_writel(sinfo
, ATMEL_LCDC_DMAFRMCFG
, value
);
604 /* Now, the LCDC core... */
606 /* Set pixel clock */
607 if (sinfo
->config
->have_alt_pixclock
)
610 clk_value_khz
= clk_get_rate(sinfo
->lcdc_clk
) / 1000;
612 value
= DIV_ROUND_UP(clk_value_khz
, PICOS2KHZ(info
->var
.pixclock
));
614 if (value
< pix_factor
) {
615 dev_notice(info
->device
, "Bypassing pixel clock divider\n");
616 lcdc_writel(sinfo
, ATMEL_LCDC_LCDCON1
, ATMEL_LCDC_BYPASS
);
618 value
= (value
/ pix_factor
) - 1;
619 dev_dbg(info
->device
, " * programming CLKVAL = 0x%08lx\n",
621 lcdc_writel(sinfo
, ATMEL_LCDC_LCDCON1
,
622 value
<< ATMEL_LCDC_CLKVAL_OFFSET
);
624 KHZ2PICOS(clk_value_khz
/ (pix_factor
* (value
+ 1)));
625 dev_dbg(info
->device
, " updated pixclk: %lu KHz\n",
626 PICOS2KHZ(info
->var
.pixclock
));
630 /* Initialize control register 2 */
631 value
= sinfo
->default_lcdcon2
;
633 if (!(info
->var
.sync
& FB_SYNC_HOR_HIGH_ACT
))
634 value
|= ATMEL_LCDC_INVLINE_INVERTED
;
635 if (!(info
->var
.sync
& FB_SYNC_VERT_HIGH_ACT
))
636 value
|= ATMEL_LCDC_INVFRAME_INVERTED
;
638 switch (info
->var
.bits_per_pixel
) {
639 case 1: value
|= ATMEL_LCDC_PIXELSIZE_1
; break;
640 case 2: value
|= ATMEL_LCDC_PIXELSIZE_2
; break;
641 case 4: value
|= ATMEL_LCDC_PIXELSIZE_4
; break;
642 case 8: value
|= ATMEL_LCDC_PIXELSIZE_8
; break;
643 case 15: /* fall through */
644 case 16: value
|= ATMEL_LCDC_PIXELSIZE_16
; break;
645 case 24: value
|= ATMEL_LCDC_PIXELSIZE_24
; break;
646 case 32: value
|= ATMEL_LCDC_PIXELSIZE_32
; break;
647 default: BUG(); break;
649 dev_dbg(info
->device
, " * LCDCON2 = %08lx\n", value
);
650 lcdc_writel(sinfo
, ATMEL_LCDC_LCDCON2
, value
);
652 /* Vertical timing */
653 value
= (info
->var
.vsync_len
- 1) << ATMEL_LCDC_VPW_OFFSET
;
654 value
|= info
->var
.upper_margin
<< ATMEL_LCDC_VBP_OFFSET
;
655 value
|= info
->var
.lower_margin
;
656 dev_dbg(info
->device
, " * LCDTIM1 = %08lx\n", value
);
657 lcdc_writel(sinfo
, ATMEL_LCDC_TIM1
, value
);
659 /* Horizontal timing */
660 value
= (info
->var
.right_margin
- 1) << ATMEL_LCDC_HFP_OFFSET
;
661 value
|= (info
->var
.hsync_len
- 1) << ATMEL_LCDC_HPW_OFFSET
;
662 value
|= (info
->var
.left_margin
- 1);
663 dev_dbg(info
->device
, " * LCDTIM2 = %08lx\n", value
);
664 lcdc_writel(sinfo
, ATMEL_LCDC_TIM2
, value
);
666 /* Horizontal value (aka line size) */
667 hozval_linesz
= compute_hozval(sinfo
, info
->var
.xres
);
670 value
= (hozval_linesz
- 1) << ATMEL_LCDC_HOZVAL_OFFSET
;
671 value
|= info
->var
.yres
- 1;
672 dev_dbg(info
->device
, " * LCDFRMCFG = %08lx\n", value
);
673 lcdc_writel(sinfo
, ATMEL_LCDC_LCDFRMCFG
, value
);
675 /* FIFO Threshold: Use formula from data sheet */
676 value
= ATMEL_LCDC_FIFO_SIZE
- (2 * ATMEL_LCDC_DMA_BURST_LEN
+ 3);
677 lcdc_writel(sinfo
, ATMEL_LCDC_FIFO
, value
);
679 /* Toggle LCD_MODE every frame */
680 lcdc_writel(sinfo
, ATMEL_LCDC_MVAL
, 0);
682 /* Disable all interrupts */
683 lcdc_writel(sinfo
, ATMEL_LCDC_IDR
, ~0UL);
684 /* Enable FIFO & DMA errors */
685 lcdc_writel(sinfo
, ATMEL_LCDC_IER
, ATMEL_LCDC_UFLWI
| ATMEL_LCDC_OWRI
| ATMEL_LCDC_MERI
);
687 /* ...wait for DMA engine to become idle... */
688 while (lcdc_readl(sinfo
, ATMEL_LCDC_DMACON
) & ATMEL_LCDC_DMABUSY
)
691 atmel_lcdfb_start(sinfo
);
693 dev_dbg(info
->device
, " * DONE\n");
698 static inline unsigned int chan_to_field(unsigned int chan
, const struct fb_bitfield
*bf
)
701 chan
>>= 16 - bf
->length
;
702 return chan
<< bf
->offset
;
706 * atmel_lcdfb_setcolreg - Optional function. Sets a color register.
707 * @regno: Which register in the CLUT we are programming
708 * @red: The red value which can be up to 16 bits wide
709 * @green: The green value which can be up to 16 bits wide
710 * @blue: The blue value which can be up to 16 bits wide.
711 * @transp: If supported the alpha value which can be up to 16 bits wide.
712 * @info: frame buffer info structure
714 * Set a single color register. The values supplied have a 16 bit
715 * magnitude which needs to be scaled in this function for the hardware.
716 * Things to take into consideration are how many color registers, if
717 * any, are supported with the current color visual. With truecolor mode
718 * no color palettes are supported. Here a pseudo palette is created
719 * which we store the value in pseudo_palette in struct fb_info. For
720 * pseudocolor mode we have a limited color palette. To deal with this
721 * we can program what color is displayed for a particular pixel value.
722 * DirectColor is similar in that we can program each color field. If
723 * we have a static colormap we don't need to implement this function.
725 * Returns negative errno on error, or zero on success. In an
726 * ideal world, this would have been the case, but as it turns
727 * out, the other drivers return 1 on failure, so that's what
730 static int atmel_lcdfb_setcolreg(unsigned int regno
, unsigned int red
,
731 unsigned int green
, unsigned int blue
,
732 unsigned int transp
, struct fb_info
*info
)
734 struct atmel_lcdfb_info
*sinfo
= info
->par
;
739 if (info
->var
.grayscale
)
740 red
= green
= blue
= (19595 * red
+ 38470 * green
741 + 7471 * blue
) >> 16;
743 switch (info
->fix
.visual
) {
744 case FB_VISUAL_TRUECOLOR
:
746 pal
= info
->pseudo_palette
;
748 val
= chan_to_field(red
, &info
->var
.red
);
749 val
|= chan_to_field(green
, &info
->var
.green
);
750 val
|= chan_to_field(blue
, &info
->var
.blue
);
757 case FB_VISUAL_PSEUDOCOLOR
:
759 if (sinfo
->config
->have_intensity_bit
) {
760 /* old style I+BGR:555 */
761 val
= ((red
>> 11) & 0x001f);
762 val
|= ((green
>> 6) & 0x03e0);
763 val
|= ((blue
>> 1) & 0x7c00);
766 * TODO: intensity bit. Maybe something like
767 * ~(red[10] ^ green[10] ^ blue[10]) & 1
770 /* new style BGR:565 / RGB:565 */
771 if (sinfo
->lcd_wiring_mode
==
772 ATMEL_LCDC_WIRING_RGB
) {
773 val
= ((blue
>> 11) & 0x001f);
774 val
|= ((red
>> 0) & 0xf800);
776 val
= ((red
>> 11) & 0x001f);
777 val
|= ((blue
>> 0) & 0xf800);
780 val
|= ((green
>> 5) & 0x07e0);
783 lcdc_writel(sinfo
, ATMEL_LCDC_LUT(regno
), val
);
788 case FB_VISUAL_MONO01
:
790 val
= (regno
== 0) ? 0x00 : 0x1F;
791 lcdc_writel(sinfo
, ATMEL_LCDC_LUT(regno
), val
);
801 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo
*var
,
802 struct fb_info
*info
)
804 dev_dbg(info
->device
, "%s\n", __func__
);
806 atmel_lcdfb_update_dma(info
, var
);
811 static int atmel_lcdfb_blank(int blank_mode
, struct fb_info
*info
)
813 struct atmel_lcdfb_info
*sinfo
= info
->par
;
815 switch (blank_mode
) {
816 case FB_BLANK_UNBLANK
:
817 case FB_BLANK_NORMAL
:
818 atmel_lcdfb_start(sinfo
);
820 case FB_BLANK_VSYNC_SUSPEND
:
821 case FB_BLANK_HSYNC_SUSPEND
:
823 case FB_BLANK_POWERDOWN
:
824 atmel_lcdfb_stop(sinfo
);
830 /* let fbcon do a soft blank for us */
831 return ((blank_mode
== FB_BLANK_NORMAL
) ? 1 : 0);
834 static struct fb_ops atmel_lcdfb_ops
= {
835 .owner
= THIS_MODULE
,
836 .fb_check_var
= atmel_lcdfb_check_var
,
837 .fb_set_par
= atmel_lcdfb_set_par
,
838 .fb_setcolreg
= atmel_lcdfb_setcolreg
,
839 .fb_blank
= atmel_lcdfb_blank
,
840 .fb_pan_display
= atmel_lcdfb_pan_display
,
841 .fb_fillrect
= cfb_fillrect
,
842 .fb_copyarea
= cfb_copyarea
,
843 .fb_imageblit
= cfb_imageblit
,
846 static irqreturn_t
atmel_lcdfb_interrupt(int irq
, void *dev_id
)
848 struct fb_info
*info
= dev_id
;
849 struct atmel_lcdfb_info
*sinfo
= info
->par
;
852 status
= lcdc_readl(sinfo
, ATMEL_LCDC_ISR
);
853 if (status
& ATMEL_LCDC_UFLWI
) {
854 dev_warn(info
->device
, "FIFO underflow %#x\n", status
);
855 /* reset DMA and FIFO to avoid screen shifting */
856 schedule_work(&sinfo
->task
);
858 lcdc_writel(sinfo
, ATMEL_LCDC_ICR
, status
);
863 * LCD controller task (to reset the LCD)
865 static void atmel_lcdfb_task(struct work_struct
*work
)
867 struct atmel_lcdfb_info
*sinfo
=
868 container_of(work
, struct atmel_lcdfb_info
, task
);
870 atmel_lcdfb_reset(sinfo
);
873 static int __init
atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info
*sinfo
)
875 struct fb_info
*info
= sinfo
->info
;
878 info
->var
.activate
|= FB_ACTIVATE_FORCE
| FB_ACTIVATE_NOW
;
880 dev_info(info
->device
,
881 "%luKiB frame buffer at %08lx (mapped at %p)\n",
882 (unsigned long)info
->fix
.smem_len
/ 1024,
883 (unsigned long)info
->fix
.smem_start
,
886 /* Allocate colormap */
887 ret
= fb_alloc_cmap(&info
->cmap
, 256, 0);
889 dev_err(info
->device
, "Alloc color map failed\n");
894 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info
*sinfo
)
896 clk_enable(sinfo
->bus_clk
);
897 clk_enable(sinfo
->lcdc_clk
);
900 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info
*sinfo
)
902 clk_disable(sinfo
->bus_clk
);
903 clk_disable(sinfo
->lcdc_clk
);
907 static int __init
atmel_lcdfb_probe(struct platform_device
*pdev
)
909 struct device
*dev
= &pdev
->dev
;
910 struct fb_info
*info
;
911 struct atmel_lcdfb_info
*sinfo
;
912 struct atmel_lcdfb_info
*pdata_sinfo
;
913 struct fb_videomode fbmode
;
914 struct resource
*regs
= NULL
;
915 struct resource
*map
= NULL
;
918 dev_dbg(dev
, "%s BEGIN\n", __func__
);
921 info
= framebuffer_alloc(sizeof(struct atmel_lcdfb_info
), dev
);
923 dev_err(dev
, "cannot allocate memory\n");
929 if (dev
->platform_data
) {
930 pdata_sinfo
= (struct atmel_lcdfb_info
*)dev
->platform_data
;
931 sinfo
->default_bpp
= pdata_sinfo
->default_bpp
;
932 sinfo
->default_dmacon
= pdata_sinfo
->default_dmacon
;
933 sinfo
->default_lcdcon2
= pdata_sinfo
->default_lcdcon2
;
934 sinfo
->default_monspecs
= pdata_sinfo
->default_monspecs
;
935 sinfo
->atmel_lcdfb_power_control
= pdata_sinfo
->atmel_lcdfb_power_control
;
936 sinfo
->guard_time
= pdata_sinfo
->guard_time
;
937 sinfo
->smem_len
= pdata_sinfo
->smem_len
;
938 sinfo
->lcdcon_is_backlight
= pdata_sinfo
->lcdcon_is_backlight
;
939 sinfo
->lcdcon_pol_negative
= pdata_sinfo
->lcdcon_pol_negative
;
940 sinfo
->lcd_wiring_mode
= pdata_sinfo
->lcd_wiring_mode
;
942 dev_err(dev
, "cannot get default configuration\n");
947 sinfo
->config
= atmel_lcdfb_get_config(pdev
);
951 strcpy(info
->fix
.id
, sinfo
->pdev
->name
);
952 info
->flags
= ATMEL_LCDFB_FBINFO_DEFAULT
;
953 info
->pseudo_palette
= sinfo
->pseudo_palette
;
954 info
->fbops
= &atmel_lcdfb_ops
;
956 memcpy(&info
->monspecs
, sinfo
->default_monspecs
, sizeof(info
->monspecs
));
957 info
->fix
= atmel_lcdfb_fix
;
959 /* Enable LCDC Clocks */
960 sinfo
->bus_clk
= clk_get(dev
, "hclk");
961 if (IS_ERR(sinfo
->bus_clk
)) {
962 ret
= PTR_ERR(sinfo
->bus_clk
);
965 sinfo
->lcdc_clk
= clk_get(dev
, "lcdc_clk");
966 if (IS_ERR(sinfo
->lcdc_clk
)) {
967 ret
= PTR_ERR(sinfo
->lcdc_clk
);
970 atmel_lcdfb_start_clock(sinfo
);
972 ret
= fb_find_mode(&info
->var
, info
, NULL
, info
->monspecs
.modedb
,
973 info
->monspecs
.modedb_len
, info
->monspecs
.modedb
,
976 dev_err(dev
, "no suitable video mode found\n");
981 regs
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
983 dev_err(dev
, "resources unusable\n");
988 sinfo
->irq_base
= platform_get_irq(pdev
, 0);
989 if (sinfo
->irq_base
< 0) {
990 dev_err(dev
, "unable to get irq\n");
991 ret
= sinfo
->irq_base
;
995 /* Initialize video memory */
996 map
= platform_get_resource(pdev
, IORESOURCE_MEM
, 1);
998 /* use a pre-allocated memory buffer */
999 info
->fix
.smem_start
= map
->start
;
1000 info
->fix
.smem_len
= resource_size(map
);
1001 if (!request_mem_region(info
->fix
.smem_start
,
1002 info
->fix
.smem_len
, pdev
->name
)) {
1007 info
->screen_base
= ioremap(info
->fix
.smem_start
, info
->fix
.smem_len
);
1008 if (!info
->screen_base
) {
1010 goto release_intmem
;
1014 * Don't clear the framebuffer -- someone may have set
1015 * up a splash image.
1018 /* allocate memory buffer */
1019 ret
= atmel_lcdfb_alloc_video_memory(sinfo
);
1021 dev_err(dev
, "cannot allocate framebuffer: %d\n", ret
);
1026 /* LCDC registers */
1027 info
->fix
.mmio_start
= regs
->start
;
1028 info
->fix
.mmio_len
= resource_size(regs
);
1030 if (!request_mem_region(info
->fix
.mmio_start
,
1031 info
->fix
.mmio_len
, pdev
->name
)) {
1036 sinfo
->mmio
= ioremap(info
->fix
.mmio_start
, info
->fix
.mmio_len
);
1038 dev_err(dev
, "cannot map LCDC registers\n");
1043 /* Initialize PWM for contrast or backlight ("off") */
1044 init_contrast(sinfo
);
1047 ret
= request_irq(sinfo
->irq_base
, atmel_lcdfb_interrupt
, 0, pdev
->name
, info
);
1049 dev_err(dev
, "request_irq failed: %d\n", ret
);
1053 /* Some operations on the LCDC might sleep and
1054 * require a preemptible task context */
1055 INIT_WORK(&sinfo
->task
, atmel_lcdfb_task
);
1057 ret
= atmel_lcdfb_init_fbinfo(sinfo
);
1059 dev_err(dev
, "init fbinfo failed: %d\n", ret
);
1060 goto unregister_irqs
;
1064 * This makes sure that our colour bitfield
1065 * descriptors are correctly initialised.
1067 atmel_lcdfb_check_var(&info
->var
, info
);
1069 ret
= fb_set_var(info
, &info
->var
);
1071 dev_warn(dev
, "unable to set display parameters\n");
1075 dev_set_drvdata(dev
, info
);
1078 * Tell the world that we're ready to go
1080 ret
= register_framebuffer(info
);
1082 dev_err(dev
, "failed to register framebuffer device: %d\n", ret
);
1086 /* add selected videomode to modelist */
1087 fb_var_to_videomode(&fbmode
, &info
->var
);
1088 fb_add_videomode(&fbmode
, &info
->modelist
);
1090 /* Power up the LCDC screen */
1091 if (sinfo
->atmel_lcdfb_power_control
)
1092 sinfo
->atmel_lcdfb_power_control(1);
1094 dev_info(dev
, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n",
1095 info
->node
, info
->fix
.mmio_start
, sinfo
->mmio
, sinfo
->irq_base
);
1100 dev_set_drvdata(dev
, NULL
);
1102 fb_dealloc_cmap(&info
->cmap
);
1104 cancel_work_sync(&sinfo
->task
);
1105 free_irq(sinfo
->irq_base
, info
);
1107 exit_backlight(sinfo
);
1108 iounmap(sinfo
->mmio
);
1110 release_mem_region(info
->fix
.mmio_start
, info
->fix
.mmio_len
);
1113 iounmap(info
->screen_base
);
1115 atmel_lcdfb_free_video_memory(sinfo
);
1119 release_mem_region(info
->fix
.smem_start
, info
->fix
.smem_len
);
1121 atmel_lcdfb_stop_clock(sinfo
);
1122 clk_put(sinfo
->lcdc_clk
);
1124 clk_put(sinfo
->bus_clk
);
1126 framebuffer_release(info
);
1128 dev_dbg(dev
, "%s FAILED\n", __func__
);
1132 static int __exit
atmel_lcdfb_remove(struct platform_device
*pdev
)
1134 struct device
*dev
= &pdev
->dev
;
1135 struct fb_info
*info
= dev_get_drvdata(dev
);
1136 struct atmel_lcdfb_info
*sinfo
;
1138 if (!info
|| !info
->par
)
1142 cancel_work_sync(&sinfo
->task
);
1143 exit_backlight(sinfo
);
1144 if (sinfo
->atmel_lcdfb_power_control
)
1145 sinfo
->atmel_lcdfb_power_control(0);
1146 unregister_framebuffer(info
);
1147 atmel_lcdfb_stop_clock(sinfo
);
1148 clk_put(sinfo
->lcdc_clk
);
1149 clk_put(sinfo
->bus_clk
);
1150 fb_dealloc_cmap(&info
->cmap
);
1151 free_irq(sinfo
->irq_base
, info
);
1152 iounmap(sinfo
->mmio
);
1153 release_mem_region(info
->fix
.mmio_start
, info
->fix
.mmio_len
);
1154 if (platform_get_resource(pdev
, IORESOURCE_MEM
, 1)) {
1155 iounmap(info
->screen_base
);
1156 release_mem_region(info
->fix
.smem_start
, info
->fix
.smem_len
);
1158 atmel_lcdfb_free_video_memory(sinfo
);
1161 dev_set_drvdata(dev
, NULL
);
1162 framebuffer_release(info
);
1169 static int atmel_lcdfb_suspend(struct platform_device
*pdev
, pm_message_t mesg
)
1171 struct fb_info
*info
= platform_get_drvdata(pdev
);
1172 struct atmel_lcdfb_info
*sinfo
= info
->par
;
1175 * We don't want to handle interrupts while the clock is
1176 * stopped. It may take forever.
1178 lcdc_writel(sinfo
, ATMEL_LCDC_IDR
, ~0UL);
1180 sinfo
->saved_lcdcon
= lcdc_readl(sinfo
, ATMEL_LCDC_CONTRAST_CTR
);
1181 lcdc_writel(sinfo
, ATMEL_LCDC_CONTRAST_CTR
, 0);
1182 if (sinfo
->atmel_lcdfb_power_control
)
1183 sinfo
->atmel_lcdfb_power_control(0);
1185 atmel_lcdfb_stop(sinfo
);
1186 atmel_lcdfb_stop_clock(sinfo
);
1191 static int atmel_lcdfb_resume(struct platform_device
*pdev
)
1193 struct fb_info
*info
= platform_get_drvdata(pdev
);
1194 struct atmel_lcdfb_info
*sinfo
= info
->par
;
1196 atmel_lcdfb_start_clock(sinfo
);
1197 atmel_lcdfb_start(sinfo
);
1198 if (sinfo
->atmel_lcdfb_power_control
)
1199 sinfo
->atmel_lcdfb_power_control(1);
1200 lcdc_writel(sinfo
, ATMEL_LCDC_CONTRAST_CTR
, sinfo
->saved_lcdcon
);
1202 /* Enable FIFO & DMA errors */
1203 lcdc_writel(sinfo
, ATMEL_LCDC_IER
, ATMEL_LCDC_UFLWI
1204 | ATMEL_LCDC_OWRI
| ATMEL_LCDC_MERI
);
1210 #define atmel_lcdfb_suspend NULL
1211 #define atmel_lcdfb_resume NULL
1214 static struct platform_driver atmel_lcdfb_driver
= {
1215 .remove
= __exit_p(atmel_lcdfb_remove
),
1216 .suspend
= atmel_lcdfb_suspend
,
1217 .resume
= atmel_lcdfb_resume
,
1218 .id_table
= atmel_lcdfb_devtypes
,
1220 .name
= "atmel_lcdfb",
1221 .owner
= THIS_MODULE
,
1225 module_platform_driver_probe(atmel_lcdfb_driver
, atmel_lcdfb_probe
);
1227 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1228 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1229 MODULE_LICENSE("GPL");