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>
23 #include <mach/board.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 #if defined(CONFIG_ARCH_AT91)
38 #define ATMEL_LCDFB_FBINFO_DEFAULT (FBINFO_DEFAULT \
39 | FBINFO_PARTIAL_PAN_OK \
40 | FBINFO_HWACCEL_YPAN)
42 static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info
*sinfo
,
43 struct fb_var_screeninfo
*var
,
48 #elif defined(CONFIG_AVR32)
49 #define ATMEL_LCDFB_FBINFO_DEFAULT (FBINFO_DEFAULT \
50 | FBINFO_PARTIAL_PAN_OK \
51 | FBINFO_HWACCEL_XPAN \
52 | FBINFO_HWACCEL_YPAN)
54 static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info
*sinfo
,
55 struct fb_var_screeninfo
*var
,
61 pixeloff
= (var
->xoffset
* info
->var
.bits_per_pixel
) & 0x1f;
63 dma2dcfg
= (info
->var
.xres_virtual
- info
->var
.xres
)
64 * info
->var
.bits_per_pixel
/ 8;
65 dma2dcfg
|= pixeloff
<< ATMEL_LCDC_PIXELOFF_OFFSET
;
66 lcdc_writel(sinfo
, ATMEL_LCDC_DMA2DCFG
, dma2dcfg
);
68 /* Update configuration */
69 lcdc_writel(sinfo
, ATMEL_LCDC_DMACON
,
70 lcdc_readl(sinfo
, ATMEL_LCDC_DMACON
)
71 | ATMEL_LCDC_DMAUPDT
);
75 static u32 contrast_ctr
= ATMEL_LCDC_PS_DIV8
76 | ATMEL_LCDC_POL_POSITIVE
77 | ATMEL_LCDC_ENA_PWMENABLE
;
79 #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
81 /* some bl->props field just changed */
82 static int atmel_bl_update_status(struct backlight_device
*bl
)
84 struct atmel_lcdfb_info
*sinfo
= bl_get_data(bl
);
85 int power
= sinfo
->bl_power
;
86 int brightness
= bl
->props
.brightness
;
88 /* REVISIT there may be a meaningful difference between
89 * fb_blank and power ... there seem to be some cases
90 * this doesn't handle correctly.
92 if (bl
->props
.fb_blank
!= sinfo
->bl_power
)
93 power
= bl
->props
.fb_blank
;
94 else if (bl
->props
.power
!= sinfo
->bl_power
)
95 power
= bl
->props
.power
;
97 if (brightness
< 0 && power
== FB_BLANK_UNBLANK
)
98 brightness
= lcdc_readl(sinfo
, ATMEL_LCDC_CONTRAST_VAL
);
99 else if (power
!= FB_BLANK_UNBLANK
)
102 lcdc_writel(sinfo
, ATMEL_LCDC_CONTRAST_VAL
, brightness
);
103 lcdc_writel(sinfo
, ATMEL_LCDC_CONTRAST_CTR
,
104 brightness
? contrast_ctr
: 0);
106 bl
->props
.fb_blank
= bl
->props
.power
= sinfo
->bl_power
= power
;
111 static int atmel_bl_get_brightness(struct backlight_device
*bl
)
113 struct atmel_lcdfb_info
*sinfo
= bl_get_data(bl
);
115 return lcdc_readl(sinfo
, ATMEL_LCDC_CONTRAST_VAL
);
118 static const struct backlight_ops atmel_lcdc_bl_ops
= {
119 .update_status
= atmel_bl_update_status
,
120 .get_brightness
= atmel_bl_get_brightness
,
123 static void init_backlight(struct atmel_lcdfb_info
*sinfo
)
125 struct backlight_properties props
;
126 struct backlight_device
*bl
;
128 sinfo
->bl_power
= FB_BLANK_UNBLANK
;
130 if (sinfo
->backlight
)
133 memset(&props
, 0, sizeof(struct backlight_properties
));
134 props
.type
= BACKLIGHT_RAW
;
135 props
.max_brightness
= 0xff;
136 bl
= backlight_device_register("backlight", &sinfo
->pdev
->dev
, sinfo
,
137 &atmel_lcdc_bl_ops
, &props
);
139 dev_err(&sinfo
->pdev
->dev
, "error %ld on backlight register\n",
143 sinfo
->backlight
= bl
;
145 bl
->props
.power
= FB_BLANK_UNBLANK
;
146 bl
->props
.fb_blank
= FB_BLANK_UNBLANK
;
147 bl
->props
.brightness
= atmel_bl_get_brightness(bl
);
150 static void exit_backlight(struct atmel_lcdfb_info
*sinfo
)
152 if (sinfo
->backlight
)
153 backlight_device_unregister(sinfo
->backlight
);
158 static void init_backlight(struct atmel_lcdfb_info
*sinfo
)
160 dev_warn(&sinfo
->pdev
->dev
, "backlight control is not available\n");
163 static void exit_backlight(struct atmel_lcdfb_info
*sinfo
)
169 static void init_contrast(struct atmel_lcdfb_info
*sinfo
)
171 /* contrast pwm can be 'inverted' */
172 if (sinfo
->lcdcon_pol_negative
)
173 contrast_ctr
&= ~(ATMEL_LCDC_POL_POSITIVE
);
175 /* have some default contrast/backlight settings */
176 lcdc_writel(sinfo
, ATMEL_LCDC_CONTRAST_CTR
, contrast_ctr
);
177 lcdc_writel(sinfo
, ATMEL_LCDC_CONTRAST_VAL
, ATMEL_LCDC_CVAL_DEFAULT
);
179 if (sinfo
->lcdcon_is_backlight
)
180 init_backlight(sinfo
);
184 static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata
= {
185 .type
= FB_TYPE_PACKED_PIXELS
,
186 .visual
= FB_VISUAL_TRUECOLOR
,
190 .accel
= FB_ACCEL_NONE
,
193 static unsigned long compute_hozval(unsigned long xres
, unsigned long lcdcon2
)
197 if (!(cpu_is_at91sam9261() || cpu_is_at91sam9g10()
198 || cpu_is_at32ap7000()))
202 if ((lcdcon2
& ATMEL_LCDC_DISTYPE
) != ATMEL_LCDC_DISTYPE_TFT
) {
204 if ((lcdcon2
& ATMEL_LCDC_DISTYPE
) == ATMEL_LCDC_DISTYPE_STNCOLOR
) {
207 if ( (lcdcon2
& ATMEL_LCDC_IFWIDTH
) == ATMEL_LCDC_IFWIDTH_4
208 || ( (lcdcon2
& ATMEL_LCDC_IFWIDTH
) == ATMEL_LCDC_IFWIDTH_8
209 && (lcdcon2
& ATMEL_LCDC_SCANMOD
) == ATMEL_LCDC_SCANMOD_DUAL
))
210 value
= DIV_ROUND_UP(value
, 4);
212 value
= DIV_ROUND_UP(value
, 8);
218 static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info
*sinfo
)
220 /* Turn off the LCD controller and the DMA controller */
221 lcdc_writel(sinfo
, ATMEL_LCDC_PWRCON
,
222 sinfo
->guard_time
<< ATMEL_LCDC_GUARDT_OFFSET
);
224 /* Wait for the LCDC core to become idle */
225 while (lcdc_readl(sinfo
, ATMEL_LCDC_PWRCON
) & ATMEL_LCDC_BUSY
)
228 lcdc_writel(sinfo
, ATMEL_LCDC_DMACON
, 0);
231 static void atmel_lcdfb_stop(struct atmel_lcdfb_info
*sinfo
)
233 atmel_lcdfb_stop_nowait(sinfo
);
235 /* Wait for DMA engine to become idle... */
236 while (lcdc_readl(sinfo
, ATMEL_LCDC_DMACON
) & ATMEL_LCDC_DMABUSY
)
240 static void atmel_lcdfb_start(struct atmel_lcdfb_info
*sinfo
)
242 lcdc_writel(sinfo
, ATMEL_LCDC_DMACON
, sinfo
->default_dmacon
);
243 lcdc_writel(sinfo
, ATMEL_LCDC_PWRCON
,
244 (sinfo
->guard_time
<< ATMEL_LCDC_GUARDT_OFFSET
)
248 static void atmel_lcdfb_update_dma(struct fb_info
*info
,
249 struct fb_var_screeninfo
*var
)
251 struct atmel_lcdfb_info
*sinfo
= info
->par
;
252 struct fb_fix_screeninfo
*fix
= &info
->fix
;
253 unsigned long dma_addr
;
255 dma_addr
= (fix
->smem_start
+ var
->yoffset
* fix
->line_length
256 + var
->xoffset
* info
->var
.bits_per_pixel
/ 8);
260 /* Set framebuffer DMA base address and pixel offset */
261 lcdc_writel(sinfo
, ATMEL_LCDC_DMABADDR1
, dma_addr
);
263 atmel_lcdfb_update_dma2d(sinfo
, var
, info
);
266 static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info
*sinfo
)
268 struct fb_info
*info
= sinfo
->info
;
270 dma_free_writecombine(info
->device
, info
->fix
.smem_len
,
271 info
->screen_base
, info
->fix
.smem_start
);
275 * atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory
276 * @sinfo: the frame buffer to allocate memory for
278 * This function is called only from the atmel_lcdfb_probe()
279 * so no locking by fb_info->mm_lock around smem_len setting is needed.
281 static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info
*sinfo
)
283 struct fb_info
*info
= sinfo
->info
;
284 struct fb_var_screeninfo
*var
= &info
->var
;
285 unsigned int smem_len
;
287 smem_len
= (var
->xres_virtual
* var
->yres_virtual
288 * ((var
->bits_per_pixel
+ 7) / 8));
289 info
->fix
.smem_len
= max(smem_len
, sinfo
->smem_len
);
291 info
->screen_base
= dma_alloc_writecombine(info
->device
, info
->fix
.smem_len
,
292 (dma_addr_t
*)&info
->fix
.smem_start
, GFP_KERNEL
);
294 if (!info
->screen_base
) {
298 memset(info
->screen_base
, 0, info
->fix
.smem_len
);
303 static const struct fb_videomode
*atmel_lcdfb_choose_mode(struct fb_var_screeninfo
*var
,
304 struct fb_info
*info
)
306 struct fb_videomode varfbmode
;
307 const struct fb_videomode
*fbmode
= NULL
;
309 fb_var_to_videomode(&varfbmode
, var
);
310 fbmode
= fb_find_nearest_mode(&varfbmode
, &info
->modelist
);
312 fb_videomode_to_var(var
, fbmode
);
318 * atmel_lcdfb_check_var - Validates a var passed in.
319 * @var: frame buffer variable screen structure
320 * @info: frame buffer structure that represents a single frame buffer
322 * Checks to see if the hardware supports the state requested by
323 * var passed in. This function does not alter the hardware
324 * state!!! This means the data stored in struct fb_info and
325 * struct atmel_lcdfb_info do not change. This includes the var
326 * inside of struct fb_info. Do NOT change these. This function
327 * can be called on its own if we intent to only test a mode and
328 * not actually set it. The stuff in modedb.c is a example of
329 * this. If the var passed in is slightly off by what the
330 * hardware can support then we alter the var PASSED in to what
331 * we can do. If the hardware doesn't support mode change a
332 * -EINVAL will be returned by the upper layers. You don't need
333 * to implement this function then. If you hardware doesn't
334 * support changing the resolution then this function is not
335 * needed. In this case the driver would just provide a var that
336 * represents the static state the screen is in.
338 * Returns negative errno on error, or zero on success.
340 static int atmel_lcdfb_check_var(struct fb_var_screeninfo
*var
,
341 struct fb_info
*info
)
343 struct device
*dev
= info
->device
;
344 struct atmel_lcdfb_info
*sinfo
= info
->par
;
345 unsigned long clk_value_khz
;
347 clk_value_khz
= clk_get_rate(sinfo
->lcdc_clk
) / 1000;
349 dev_dbg(dev
, "%s:\n", __func__
);
351 if (!(var
->pixclock
&& var
->bits_per_pixel
)) {
352 /* choose a suitable mode if possible */
353 if (!atmel_lcdfb_choose_mode(var
, info
)) {
354 dev_err(dev
, "needed value not specified\n");
359 dev_dbg(dev
, " resolution: %ux%u\n", var
->xres
, var
->yres
);
360 dev_dbg(dev
, " pixclk: %lu KHz\n", PICOS2KHZ(var
->pixclock
));
361 dev_dbg(dev
, " bpp: %u\n", var
->bits_per_pixel
);
362 dev_dbg(dev
, " clk: %lu KHz\n", clk_value_khz
);
364 if (PICOS2KHZ(var
->pixclock
) > clk_value_khz
) {
365 dev_err(dev
, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var
->pixclock
));
369 /* Do not allow to have real resoulution larger than virtual */
370 if (var
->xres
> var
->xres_virtual
)
371 var
->xres_virtual
= var
->xres
;
373 if (var
->yres
> var
->yres_virtual
)
374 var
->yres_virtual
= var
->yres
;
376 /* Force same alignment for each line */
377 var
->xres
= (var
->xres
+ 3) & ~3UL;
378 var
->xres_virtual
= (var
->xres_virtual
+ 3) & ~3UL;
380 var
->red
.msb_right
= var
->green
.msb_right
= var
->blue
.msb_right
= 0;
381 var
->transp
.msb_right
= 0;
382 var
->transp
.offset
= var
->transp
.length
= 0;
383 var
->xoffset
= var
->yoffset
= 0;
385 if (info
->fix
.smem_len
) {
386 unsigned int smem_len
= (var
->xres_virtual
* var
->yres_virtual
387 * ((var
->bits_per_pixel
+ 7) / 8));
388 if (smem_len
> info
->fix
.smem_len
)
392 /* Saturate vertical and horizontal timings at maximum values */
393 var
->vsync_len
= min_t(u32
, var
->vsync_len
,
394 (ATMEL_LCDC_VPW
>> ATMEL_LCDC_VPW_OFFSET
) + 1);
395 var
->upper_margin
= min_t(u32
, var
->upper_margin
,
396 ATMEL_LCDC_VBP
>> ATMEL_LCDC_VBP_OFFSET
);
397 var
->lower_margin
= min_t(u32
, var
->lower_margin
,
399 var
->right_margin
= min_t(u32
, var
->right_margin
,
400 (ATMEL_LCDC_HFP
>> ATMEL_LCDC_HFP_OFFSET
) + 1);
401 var
->hsync_len
= min_t(u32
, var
->hsync_len
,
402 (ATMEL_LCDC_HPW
>> ATMEL_LCDC_HPW_OFFSET
) + 1);
403 var
->left_margin
= min_t(u32
, var
->left_margin
,
406 /* Some parameters can't be zero */
407 var
->vsync_len
= max_t(u32
, var
->vsync_len
, 1);
408 var
->right_margin
= max_t(u32
, var
->right_margin
, 1);
409 var
->hsync_len
= max_t(u32
, var
->hsync_len
, 1);
410 var
->left_margin
= max_t(u32
, var
->left_margin
, 1);
412 switch (var
->bits_per_pixel
) {
417 var
->red
.offset
= var
->green
.offset
= var
->blue
.offset
= 0;
418 var
->red
.length
= var
->green
.length
= var
->blue
.length
419 = var
->bits_per_pixel
;
423 if (sinfo
->lcd_wiring_mode
== ATMEL_LCDC_WIRING_RGB
) {
425 var
->red
.offset
= 11;
426 var
->blue
.offset
= 0;
427 var
->green
.length
= 6;
428 } else if (sinfo
->lcd_wiring_mode
== ATMEL_LCDC_WIRING_RGB555
) {
429 var
->red
.offset
= 10;
430 var
->blue
.offset
= 0;
431 var
->green
.length
= 5;
435 var
->blue
.offset
= 10;
436 var
->green
.length
= 5;
438 var
->green
.offset
= 5;
439 var
->red
.length
= var
->blue
.length
= 5;
442 var
->transp
.offset
= 24;
443 var
->transp
.length
= 8;
446 if (sinfo
->lcd_wiring_mode
== ATMEL_LCDC_WIRING_RGB
) {
448 var
->red
.offset
= 16;
449 var
->blue
.offset
= 0;
453 var
->blue
.offset
= 16;
455 var
->green
.offset
= 8;
456 var
->red
.length
= var
->green
.length
= var
->blue
.length
= 8;
459 dev_err(dev
, "color depth %d not supported\n",
460 var
->bits_per_pixel
);
470 static void atmel_lcdfb_reset(struct atmel_lcdfb_info
*sinfo
)
474 atmel_lcdfb_stop(sinfo
);
475 atmel_lcdfb_start(sinfo
);
479 * atmel_lcdfb_set_par - Alters the hardware state.
480 * @info: frame buffer structure that represents a single frame buffer
482 * Using the fb_var_screeninfo in fb_info we set the resolution
483 * of the this particular framebuffer. This function alters the
484 * par AND the fb_fix_screeninfo stored in fb_info. It doesn't
485 * not alter var in fb_info since we are using that data. This
486 * means we depend on the data in var inside fb_info to be
487 * supported by the hardware. atmel_lcdfb_check_var is always called
488 * before atmel_lcdfb_set_par to ensure this. Again if you can't
489 * change the resolution you don't need this function.
492 static int atmel_lcdfb_set_par(struct fb_info
*info
)
494 struct atmel_lcdfb_info
*sinfo
= info
->par
;
495 unsigned long hozval_linesz
;
497 unsigned long clk_value_khz
;
498 unsigned long bits_per_line
;
499 unsigned long pix_factor
= 2;
503 dev_dbg(info
->device
, "%s:\n", __func__
);
504 dev_dbg(info
->device
, " * resolution: %ux%u (%ux%u virtual)\n",
505 info
->var
.xres
, info
->var
.yres
,
506 info
->var
.xres_virtual
, info
->var
.yres_virtual
);
508 atmel_lcdfb_stop_nowait(sinfo
);
510 if (info
->var
.bits_per_pixel
== 1)
511 info
->fix
.visual
= FB_VISUAL_MONO01
;
512 else if (info
->var
.bits_per_pixel
<= 8)
513 info
->fix
.visual
= FB_VISUAL_PSEUDOCOLOR
;
515 info
->fix
.visual
= FB_VISUAL_TRUECOLOR
;
517 bits_per_line
= info
->var
.xres_virtual
* info
->var
.bits_per_pixel
;
518 info
->fix
.line_length
= DIV_ROUND_UP(bits_per_line
, 8);
520 /* Re-initialize the DMA engine... */
521 dev_dbg(info
->device
, " * update DMA engine\n");
522 atmel_lcdfb_update_dma(info
, &info
->var
);
524 /* ...set frame size and burst length = 8 words (?) */
525 value
= (info
->var
.yres
* info
->var
.xres
* info
->var
.bits_per_pixel
) / 32;
526 value
|= ((ATMEL_LCDC_DMA_BURST_LEN
- 1) << ATMEL_LCDC_BLENGTH_OFFSET
);
527 lcdc_writel(sinfo
, ATMEL_LCDC_DMAFRMCFG
, value
);
529 /* Now, the LCDC core... */
531 /* Set pixel clock */
532 if (cpu_is_at91sam9g45() && !cpu_is_at91sam9g45es())
535 clk_value_khz
= clk_get_rate(sinfo
->lcdc_clk
) / 1000;
537 value
= DIV_ROUND_UP(clk_value_khz
, PICOS2KHZ(info
->var
.pixclock
));
539 if (value
< pix_factor
) {
540 dev_notice(info
->device
, "Bypassing pixel clock divider\n");
541 lcdc_writel(sinfo
, ATMEL_LCDC_LCDCON1
, ATMEL_LCDC_BYPASS
);
543 value
= (value
/ pix_factor
) - 1;
544 dev_dbg(info
->device
, " * programming CLKVAL = 0x%08lx\n",
546 lcdc_writel(sinfo
, ATMEL_LCDC_LCDCON1
,
547 value
<< ATMEL_LCDC_CLKVAL_OFFSET
);
549 KHZ2PICOS(clk_value_khz
/ (pix_factor
* (value
+ 1)));
550 dev_dbg(info
->device
, " updated pixclk: %lu KHz\n",
551 PICOS2KHZ(info
->var
.pixclock
));
555 /* Initialize control register 2 */
556 value
= sinfo
->default_lcdcon2
;
558 if (!(info
->var
.sync
& FB_SYNC_HOR_HIGH_ACT
))
559 value
|= ATMEL_LCDC_INVLINE_INVERTED
;
560 if (!(info
->var
.sync
& FB_SYNC_VERT_HIGH_ACT
))
561 value
|= ATMEL_LCDC_INVFRAME_INVERTED
;
563 switch (info
->var
.bits_per_pixel
) {
564 case 1: value
|= ATMEL_LCDC_PIXELSIZE_1
; break;
565 case 2: value
|= ATMEL_LCDC_PIXELSIZE_2
; break;
566 case 4: value
|= ATMEL_LCDC_PIXELSIZE_4
; break;
567 case 8: value
|= ATMEL_LCDC_PIXELSIZE_8
; break;
568 case 15: /* fall through */
569 case 16: value
|= ATMEL_LCDC_PIXELSIZE_16
; break;
570 case 24: value
|= ATMEL_LCDC_PIXELSIZE_24
; break;
571 case 32: value
|= ATMEL_LCDC_PIXELSIZE_32
; break;
572 default: BUG(); break;
574 dev_dbg(info
->device
, " * LCDCON2 = %08lx\n", value
);
575 lcdc_writel(sinfo
, ATMEL_LCDC_LCDCON2
, value
);
577 /* Vertical timing */
578 value
= (info
->var
.vsync_len
- 1) << ATMEL_LCDC_VPW_OFFSET
;
579 value
|= info
->var
.upper_margin
<< ATMEL_LCDC_VBP_OFFSET
;
580 value
|= info
->var
.lower_margin
;
581 dev_dbg(info
->device
, " * LCDTIM1 = %08lx\n", value
);
582 lcdc_writel(sinfo
, ATMEL_LCDC_TIM1
, value
);
584 /* Horizontal timing */
585 value
= (info
->var
.right_margin
- 1) << ATMEL_LCDC_HFP_OFFSET
;
586 value
|= (info
->var
.hsync_len
- 1) << ATMEL_LCDC_HPW_OFFSET
;
587 value
|= (info
->var
.left_margin
- 1);
588 dev_dbg(info
->device
, " * LCDTIM2 = %08lx\n", value
);
589 lcdc_writel(sinfo
, ATMEL_LCDC_TIM2
, value
);
591 /* Horizontal value (aka line size) */
592 hozval_linesz
= compute_hozval(info
->var
.xres
,
593 lcdc_readl(sinfo
, ATMEL_LCDC_LCDCON2
));
596 value
= (hozval_linesz
- 1) << ATMEL_LCDC_HOZVAL_OFFSET
;
597 value
|= info
->var
.yres
- 1;
598 dev_dbg(info
->device
, " * LCDFRMCFG = %08lx\n", value
);
599 lcdc_writel(sinfo
, ATMEL_LCDC_LCDFRMCFG
, value
);
601 /* FIFO Threshold: Use formula from data sheet */
602 value
= ATMEL_LCDC_FIFO_SIZE
- (2 * ATMEL_LCDC_DMA_BURST_LEN
+ 3);
603 lcdc_writel(sinfo
, ATMEL_LCDC_FIFO
, value
);
605 /* Toggle LCD_MODE every frame */
606 lcdc_writel(sinfo
, ATMEL_LCDC_MVAL
, 0);
608 /* Disable all interrupts */
609 lcdc_writel(sinfo
, ATMEL_LCDC_IDR
, ~0UL);
610 /* Enable FIFO & DMA errors */
611 lcdc_writel(sinfo
, ATMEL_LCDC_IER
, ATMEL_LCDC_UFLWI
| ATMEL_LCDC_OWRI
| ATMEL_LCDC_MERI
);
613 /* ...wait for DMA engine to become idle... */
614 while (lcdc_readl(sinfo
, ATMEL_LCDC_DMACON
) & ATMEL_LCDC_DMABUSY
)
617 atmel_lcdfb_start(sinfo
);
619 dev_dbg(info
->device
, " * DONE\n");
624 static inline unsigned int chan_to_field(unsigned int chan
, const struct fb_bitfield
*bf
)
627 chan
>>= 16 - bf
->length
;
628 return chan
<< bf
->offset
;
632 * atmel_lcdfb_setcolreg - Optional function. Sets a color register.
633 * @regno: Which register in the CLUT we are programming
634 * @red: The red value which can be up to 16 bits wide
635 * @green: The green value which can be up to 16 bits wide
636 * @blue: The blue value which can be up to 16 bits wide.
637 * @transp: If supported the alpha value which can be up to 16 bits wide.
638 * @info: frame buffer info structure
640 * Set a single color register. The values supplied have a 16 bit
641 * magnitude which needs to be scaled in this function for the hardware.
642 * Things to take into consideration are how many color registers, if
643 * any, are supported with the current color visual. With truecolor mode
644 * no color palettes are supported. Here a pseudo palette is created
645 * which we store the value in pseudo_palette in struct fb_info. For
646 * pseudocolor mode we have a limited color palette. To deal with this
647 * we can program what color is displayed for a particular pixel value.
648 * DirectColor is similar in that we can program each color field. If
649 * we have a static colormap we don't need to implement this function.
651 * Returns negative errno on error, or zero on success. In an
652 * ideal world, this would have been the case, but as it turns
653 * out, the other drivers return 1 on failure, so that's what
656 static int atmel_lcdfb_setcolreg(unsigned int regno
, unsigned int red
,
657 unsigned int green
, unsigned int blue
,
658 unsigned int transp
, struct fb_info
*info
)
660 struct atmel_lcdfb_info
*sinfo
= info
->par
;
665 if (info
->var
.grayscale
)
666 red
= green
= blue
= (19595 * red
+ 38470 * green
667 + 7471 * blue
) >> 16;
669 switch (info
->fix
.visual
) {
670 case FB_VISUAL_TRUECOLOR
:
672 pal
= info
->pseudo_palette
;
674 val
= chan_to_field(red
, &info
->var
.red
);
675 val
|= chan_to_field(green
, &info
->var
.green
);
676 val
|= chan_to_field(blue
, &info
->var
.blue
);
683 case FB_VISUAL_PSEUDOCOLOR
:
685 val
= ((red
>> 11) & 0x001f);
686 val
|= ((green
>> 6) & 0x03e0);
687 val
|= ((blue
>> 1) & 0x7c00);
690 * TODO: intensity bit. Maybe something like
691 * ~(red[10] ^ green[10] ^ blue[10]) & 1
694 lcdc_writel(sinfo
, ATMEL_LCDC_LUT(regno
), val
);
699 case FB_VISUAL_MONO01
:
701 val
= (regno
== 0) ? 0x00 : 0x1F;
702 lcdc_writel(sinfo
, ATMEL_LCDC_LUT(regno
), val
);
712 static int atmel_lcdfb_pan_display(struct fb_var_screeninfo
*var
,
713 struct fb_info
*info
)
715 dev_dbg(info
->device
, "%s\n", __func__
);
717 atmel_lcdfb_update_dma(info
, var
);
722 static int atmel_lcdfb_blank(int blank_mode
, struct fb_info
*info
)
724 struct atmel_lcdfb_info
*sinfo
= info
->par
;
726 switch (blank_mode
) {
727 case FB_BLANK_UNBLANK
:
728 case FB_BLANK_NORMAL
:
729 atmel_lcdfb_start(sinfo
);
731 case FB_BLANK_VSYNC_SUSPEND
:
732 case FB_BLANK_HSYNC_SUSPEND
:
734 case FB_BLANK_POWERDOWN
:
735 atmel_lcdfb_stop(sinfo
);
741 /* let fbcon do a soft blank for us */
742 return ((blank_mode
== FB_BLANK_NORMAL
) ? 1 : 0);
745 static struct fb_ops atmel_lcdfb_ops
= {
746 .owner
= THIS_MODULE
,
747 .fb_check_var
= atmel_lcdfb_check_var
,
748 .fb_set_par
= atmel_lcdfb_set_par
,
749 .fb_setcolreg
= atmel_lcdfb_setcolreg
,
750 .fb_blank
= atmel_lcdfb_blank
,
751 .fb_pan_display
= atmel_lcdfb_pan_display
,
752 .fb_fillrect
= cfb_fillrect
,
753 .fb_copyarea
= cfb_copyarea
,
754 .fb_imageblit
= cfb_imageblit
,
757 static irqreturn_t
atmel_lcdfb_interrupt(int irq
, void *dev_id
)
759 struct fb_info
*info
= dev_id
;
760 struct atmel_lcdfb_info
*sinfo
= info
->par
;
763 status
= lcdc_readl(sinfo
, ATMEL_LCDC_ISR
);
764 if (status
& ATMEL_LCDC_UFLWI
) {
765 dev_warn(info
->device
, "FIFO underflow %#x\n", status
);
766 /* reset DMA and FIFO to avoid screen shifting */
767 schedule_work(&sinfo
->task
);
769 lcdc_writel(sinfo
, ATMEL_LCDC_ICR
, status
);
774 * LCD controller task (to reset the LCD)
776 static void atmel_lcdfb_task(struct work_struct
*work
)
778 struct atmel_lcdfb_info
*sinfo
=
779 container_of(work
, struct atmel_lcdfb_info
, task
);
781 atmel_lcdfb_reset(sinfo
);
784 static int __init
atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info
*sinfo
)
786 struct fb_info
*info
= sinfo
->info
;
789 info
->var
.activate
|= FB_ACTIVATE_FORCE
| FB_ACTIVATE_NOW
;
791 dev_info(info
->device
,
792 "%luKiB frame buffer at %08lx (mapped at %p)\n",
793 (unsigned long)info
->fix
.smem_len
/ 1024,
794 (unsigned long)info
->fix
.smem_start
,
797 /* Allocate colormap */
798 ret
= fb_alloc_cmap(&info
->cmap
, 256, 0);
800 dev_err(info
->device
, "Alloc color map failed\n");
805 static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info
*sinfo
)
808 clk_enable(sinfo
->bus_clk
);
809 clk_enable(sinfo
->lcdc_clk
);
812 static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info
*sinfo
)
815 clk_disable(sinfo
->bus_clk
);
816 clk_disable(sinfo
->lcdc_clk
);
820 static int __init
atmel_lcdfb_probe(struct platform_device
*pdev
)
822 struct device
*dev
= &pdev
->dev
;
823 struct fb_info
*info
;
824 struct atmel_lcdfb_info
*sinfo
;
825 struct atmel_lcdfb_info
*pdata_sinfo
;
826 struct fb_videomode fbmode
;
827 struct resource
*regs
= NULL
;
828 struct resource
*map
= NULL
;
831 dev_dbg(dev
, "%s BEGIN\n", __func__
);
834 info
= framebuffer_alloc(sizeof(struct atmel_lcdfb_info
), dev
);
836 dev_err(dev
, "cannot allocate memory\n");
842 if (dev
->platform_data
) {
843 pdata_sinfo
= (struct atmel_lcdfb_info
*)dev
->platform_data
;
844 sinfo
->default_bpp
= pdata_sinfo
->default_bpp
;
845 sinfo
->default_dmacon
= pdata_sinfo
->default_dmacon
;
846 sinfo
->default_lcdcon2
= pdata_sinfo
->default_lcdcon2
;
847 sinfo
->default_monspecs
= pdata_sinfo
->default_monspecs
;
848 sinfo
->atmel_lcdfb_power_control
= pdata_sinfo
->atmel_lcdfb_power_control
;
849 sinfo
->guard_time
= pdata_sinfo
->guard_time
;
850 sinfo
->smem_len
= pdata_sinfo
->smem_len
;
851 sinfo
->lcdcon_is_backlight
= pdata_sinfo
->lcdcon_is_backlight
;
852 sinfo
->lcdcon_pol_negative
= pdata_sinfo
->lcdcon_pol_negative
;
853 sinfo
->lcd_wiring_mode
= pdata_sinfo
->lcd_wiring_mode
;
855 dev_err(dev
, "cannot get default configuration\n");
861 strcpy(info
->fix
.id
, sinfo
->pdev
->name
);
862 info
->flags
= ATMEL_LCDFB_FBINFO_DEFAULT
;
863 info
->pseudo_palette
= sinfo
->pseudo_palette
;
864 info
->fbops
= &atmel_lcdfb_ops
;
866 memcpy(&info
->monspecs
, sinfo
->default_monspecs
, sizeof(info
->monspecs
));
867 info
->fix
= atmel_lcdfb_fix
;
869 /* Enable LCDC Clocks */
870 if (cpu_is_at91sam9261() || cpu_is_at91sam9g10()
871 || cpu_is_at32ap7000()) {
872 sinfo
->bus_clk
= clk_get(dev
, "hck1");
873 if (IS_ERR(sinfo
->bus_clk
)) {
874 ret
= PTR_ERR(sinfo
->bus_clk
);
878 sinfo
->lcdc_clk
= clk_get(dev
, "lcdc_clk");
879 if (IS_ERR(sinfo
->lcdc_clk
)) {
880 ret
= PTR_ERR(sinfo
->lcdc_clk
);
883 atmel_lcdfb_start_clock(sinfo
);
885 ret
= fb_find_mode(&info
->var
, info
, NULL
, info
->monspecs
.modedb
,
886 info
->monspecs
.modedb_len
, info
->monspecs
.modedb
,
889 dev_err(dev
, "no suitable video mode found\n");
894 regs
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
896 dev_err(dev
, "resources unusable\n");
901 sinfo
->irq_base
= platform_get_irq(pdev
, 0);
902 if (sinfo
->irq_base
< 0) {
903 dev_err(dev
, "unable to get irq\n");
904 ret
= sinfo
->irq_base
;
908 /* Initialize video memory */
909 map
= platform_get_resource(pdev
, IORESOURCE_MEM
, 1);
911 /* use a pre-allocated memory buffer */
912 info
->fix
.smem_start
= map
->start
;
913 info
->fix
.smem_len
= resource_size(map
);
914 if (!request_mem_region(info
->fix
.smem_start
,
915 info
->fix
.smem_len
, pdev
->name
)) {
920 info
->screen_base
= ioremap(info
->fix
.smem_start
, info
->fix
.smem_len
);
921 if (!info
->screen_base
)
925 * Don't clear the framebuffer -- someone may have set
929 /* alocate memory buffer */
930 ret
= atmel_lcdfb_alloc_video_memory(sinfo
);
932 dev_err(dev
, "cannot allocate framebuffer: %d\n", ret
);
938 info
->fix
.mmio_start
= regs
->start
;
939 info
->fix
.mmio_len
= resource_size(regs
);
941 if (!request_mem_region(info
->fix
.mmio_start
,
942 info
->fix
.mmio_len
, pdev
->name
)) {
947 sinfo
->mmio
= ioremap(info
->fix
.mmio_start
, info
->fix
.mmio_len
);
949 dev_err(dev
, "cannot map LCDC registers\n");
953 /* Initialize PWM for contrast or backlight ("off") */
954 init_contrast(sinfo
);
957 ret
= request_irq(sinfo
->irq_base
, atmel_lcdfb_interrupt
, 0, pdev
->name
, info
);
959 dev_err(dev
, "request_irq failed: %d\n", ret
);
963 /* Some operations on the LCDC might sleep and
964 * require a preemptible task context */
965 INIT_WORK(&sinfo
->task
, atmel_lcdfb_task
);
967 ret
= atmel_lcdfb_init_fbinfo(sinfo
);
969 dev_err(dev
, "init fbinfo failed: %d\n", ret
);
970 goto unregister_irqs
;
974 * This makes sure that our colour bitfield
975 * descriptors are correctly initialised.
977 atmel_lcdfb_check_var(&info
->var
, info
);
979 ret
= fb_set_var(info
, &info
->var
);
981 dev_warn(dev
, "unable to set display parameters\n");
985 dev_set_drvdata(dev
, info
);
988 * Tell the world that we're ready to go
990 ret
= register_framebuffer(info
);
992 dev_err(dev
, "failed to register framebuffer device: %d\n", ret
);
996 /* add selected videomode to modelist */
997 fb_var_to_videomode(&fbmode
, &info
->var
);
998 fb_add_videomode(&fbmode
, &info
->modelist
);
1000 /* Power up the LCDC screen */
1001 if (sinfo
->atmel_lcdfb_power_control
)
1002 sinfo
->atmel_lcdfb_power_control(1);
1004 dev_info(dev
, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n",
1005 info
->node
, info
->fix
.mmio_start
, sinfo
->mmio
, sinfo
->irq_base
);
1010 dev_set_drvdata(dev
, NULL
);
1012 fb_dealloc_cmap(&info
->cmap
);
1014 cancel_work_sync(&sinfo
->task
);
1015 free_irq(sinfo
->irq_base
, info
);
1017 exit_backlight(sinfo
);
1018 iounmap(sinfo
->mmio
);
1020 release_mem_region(info
->fix
.mmio_start
, info
->fix
.mmio_len
);
1023 iounmap(info
->screen_base
);
1025 atmel_lcdfb_free_video_memory(sinfo
);
1029 release_mem_region(info
->fix
.smem_start
, info
->fix
.smem_len
);
1031 atmel_lcdfb_stop_clock(sinfo
);
1032 clk_put(sinfo
->lcdc_clk
);
1035 clk_put(sinfo
->bus_clk
);
1037 framebuffer_release(info
);
1039 dev_dbg(dev
, "%s FAILED\n", __func__
);
1043 static int __exit
atmel_lcdfb_remove(struct platform_device
*pdev
)
1045 struct device
*dev
= &pdev
->dev
;
1046 struct fb_info
*info
= dev_get_drvdata(dev
);
1047 struct atmel_lcdfb_info
*sinfo
;
1049 if (!info
|| !info
->par
)
1053 cancel_work_sync(&sinfo
->task
);
1054 exit_backlight(sinfo
);
1055 if (sinfo
->atmel_lcdfb_power_control
)
1056 sinfo
->atmel_lcdfb_power_control(0);
1057 unregister_framebuffer(info
);
1058 atmel_lcdfb_stop_clock(sinfo
);
1059 clk_put(sinfo
->lcdc_clk
);
1061 clk_put(sinfo
->bus_clk
);
1062 fb_dealloc_cmap(&info
->cmap
);
1063 free_irq(sinfo
->irq_base
, info
);
1064 iounmap(sinfo
->mmio
);
1065 release_mem_region(info
->fix
.mmio_start
, info
->fix
.mmio_len
);
1066 if (platform_get_resource(pdev
, IORESOURCE_MEM
, 1)) {
1067 iounmap(info
->screen_base
);
1068 release_mem_region(info
->fix
.smem_start
, info
->fix
.smem_len
);
1070 atmel_lcdfb_free_video_memory(sinfo
);
1073 dev_set_drvdata(dev
, NULL
);
1074 framebuffer_release(info
);
1081 static int atmel_lcdfb_suspend(struct platform_device
*pdev
, pm_message_t mesg
)
1083 struct fb_info
*info
= platform_get_drvdata(pdev
);
1084 struct atmel_lcdfb_info
*sinfo
= info
->par
;
1087 * We don't want to handle interrupts while the clock is
1088 * stopped. It may take forever.
1090 lcdc_writel(sinfo
, ATMEL_LCDC_IDR
, ~0UL);
1092 sinfo
->saved_lcdcon
= lcdc_readl(sinfo
, ATMEL_LCDC_CONTRAST_VAL
);
1093 lcdc_writel(sinfo
, ATMEL_LCDC_CONTRAST_CTR
, 0);
1094 if (sinfo
->atmel_lcdfb_power_control
)
1095 sinfo
->atmel_lcdfb_power_control(0);
1097 atmel_lcdfb_stop(sinfo
);
1098 atmel_lcdfb_stop_clock(sinfo
);
1103 static int atmel_lcdfb_resume(struct platform_device
*pdev
)
1105 struct fb_info
*info
= platform_get_drvdata(pdev
);
1106 struct atmel_lcdfb_info
*sinfo
= info
->par
;
1108 atmel_lcdfb_start_clock(sinfo
);
1109 atmel_lcdfb_start(sinfo
);
1110 if (sinfo
->atmel_lcdfb_power_control
)
1111 sinfo
->atmel_lcdfb_power_control(1);
1112 lcdc_writel(sinfo
, ATMEL_LCDC_CONTRAST_CTR
, sinfo
->saved_lcdcon
);
1114 /* Enable FIFO & DMA errors */
1115 lcdc_writel(sinfo
, ATMEL_LCDC_IER
, ATMEL_LCDC_UFLWI
1116 | ATMEL_LCDC_OWRI
| ATMEL_LCDC_MERI
);
1122 #define atmel_lcdfb_suspend NULL
1123 #define atmel_lcdfb_resume NULL
1126 static struct platform_driver atmel_lcdfb_driver
= {
1127 .remove
= __exit_p(atmel_lcdfb_remove
),
1128 .suspend
= atmel_lcdfb_suspend
,
1129 .resume
= atmel_lcdfb_resume
,
1132 .name
= "atmel_lcdfb",
1133 .owner
= THIS_MODULE
,
1137 static int __init
atmel_lcdfb_init(void)
1139 return platform_driver_probe(&atmel_lcdfb_driver
, atmel_lcdfb_probe
);
1142 static void __exit
atmel_lcdfb_exit(void)
1144 platform_driver_unregister(&atmel_lcdfb_driver
);
1147 module_init(atmel_lcdfb_init
);
1148 module_exit(atmel_lcdfb_exit
);
1150 MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver");
1151 MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
1152 MODULE_LICENSE("GPL");