/*
* Driver for AT91/AT32 LCD Controller
*
* Copyright (C) 2007 Atmel Corporation
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/backlight.h>
#include <linux/gfp.h>
#include <mach/board.h>
#include <mach/cpu.h>
#include <mach/gpio.h>
#include <video/atmel_lcdc.h>
#define lcdc_readl(sinfo, reg) __raw_readl((sinfo)->mmio+(reg))
#define lcdc_writel(sinfo, reg, val) __raw_writel((val), (sinfo)->mmio+(reg))
/* configurable parameters */
#define ATMEL_LCDC_CVAL_DEFAULT 0xc8
#define ATMEL_LCDC_DMA_BURST_LEN 8 /* words */
#define ATMEL_LCDC_FIFO_SIZE 512 /* words */
#if defined(CONFIG_ARCH_AT91)
#define ATMEL_LCDFB_FBINFO_DEFAULT (FBINFO_DEFAULT \
| FBINFO_PARTIAL_PAN_OK \
| FBINFO_HWACCEL_YPAN)
static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
struct fb_var_screeninfo *var)
{
}
#elif defined(CONFIG_AVR32)
#define ATMEL_LCDFB_FBINFO_DEFAULT (FBINFO_DEFAULT \
| FBINFO_PARTIAL_PAN_OK \
| FBINFO_HWACCEL_XPAN \
| FBINFO_HWACCEL_YPAN)
static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo,
struct fb_var_screeninfo *var)
{
u32 dma2dcfg;
u32 pixeloff;
pixeloff = (var->xoffset * var->bits_per_pixel) & 0x1f;
dma2dcfg = ((var->xres_virtual - var->xres) * var->bits_per_pixel) / 8;
dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET;
lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg);
/* Update configuration */
lcdc_writel(sinfo, ATMEL_LCDC_DMACON,
lcdc_readl(sinfo, ATMEL_LCDC_DMACON)
| ATMEL_LCDC_DMAUPDT);
}
#endif
static const u32 contrast_ctr = ATMEL_LCDC_PS_DIV8
| ATMEL_LCDC_POL_POSITIVE
| ATMEL_LCDC_ENA_PWMENABLE;
#ifdef CONFIG_BACKLIGHT_ATMEL_LCDC
/* some bl->props field just changed */
static int atmel_bl_update_status(struct backlight_device *bl)
{
struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
int power = sinfo->bl_power;
int brightness = bl->props.brightness;
/* REVISIT there may be a meaningful difference between
* fb_blank and power ... there seem to be some cases
* this doesn't handle correctly.
*/
if (bl->props.fb_blank != sinfo->bl_power)
power = bl->props.fb_blank;
else if (bl->props.power != sinfo->bl_power)
power = bl->props.power;
if (brightness < 0 && power == FB_BLANK_UNBLANK)
brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
else if (power != FB_BLANK_UNBLANK)
brightness = 0;
lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness);
lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
brightness ? contrast_ctr : 0);
bl->props.fb_blank = bl->props.power = sinfo->bl_power = power;
return 0;
}
static int atmel_bl_get_brightness(struct backlight_device *bl)
{
struct atmel_lcdfb_info *sinfo = bl_get_data(bl);
return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL);
}
static const struct backlight_ops atmel_lcdc_bl_ops = {
.update_status = atmel_bl_update_status,
.get_brightness = atmel_bl_get_brightness,
};
static void init_backlight(struct atmel_lcdfb_info *sinfo)
{
struct backlight_properties props;
struct backlight_device *bl;
sinfo->bl_power = FB_BLANK_UNBLANK;
if (sinfo->backlight)
return;
memset(&props, 0, sizeof(struct backlight_properties));
props.max_brightness = 0xff;
bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo,
&atmel_lcdc_bl_ops, &props);