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i.MX fb: Add support for overlay framebuffer 

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2009-08-03 13:22:57 +02:00
parent b96916ac9b
commit e9dc699882
2 changed files with 153 additions and 1 deletions
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6
drivers/video/Kconfig
View File

@ -1,11 +1,15 @@
menu "Video drivers "
config VIDEO
bool "Enable Framebuffersupport"
bool "Enable Framebuffer support"
config DRIVER_VIDEO_IMX
bool "i.MX framebuffer driver"
depends on ARCH_IMX
depends on VIDEO
config IMXFB_DRIVER_VIDEO_IMX_OVERLAY
bool "i.MX framebuffer overlay support"
depends on DRIVER_VIDEO_IMX && (ARCH_IMX27 || ARCH_IMX21)
endmenu

148
drivers/video/imx.c
View File

@ -114,6 +114,17 @@
#define LCDISR_EOF (1<<1)
#define LCDISR_BOF (1<<0)
#define LCDC_LGWSAR 0x50
#define LCDC_LGWSR 0x54
#define LCDC_LGWVPWR 0x58
#define LCDC_LGWPOR 0x5c
#define LCDC_LGWPR 0x60
#define LCDC_LGWCR 0x64
#define LGWCR_GWAV(alpha) (((alpha) & 0xff) << 24)
#define LGWCR_GWE (1 << 22)
#define LCDC_LGWDCR 0x68
/*
* These are the bitfields for each
* display depth that we support.
@ -139,6 +150,12 @@ struct imxfb_info {
struct imx_fb_videomode *mode;
struct fb_info info;
struct device_d *dev;
struct fb_info overlay;
struct param_d param_alpha;
char alpha_string[4];
};
#define IMX_NAME "IMX"
@ -354,6 +371,127 @@ static struct fb_ops imxfb_ops = {
.fb_disable = imxfb_disable_controller,
};
#ifdef CONFIG_IMXFB_DRIVER_VIDEO_IMX_OVERLAY
static void imxfb_overlay_enable_controller(struct fb_info *overlay)
{
struct imxfb_info *fbi = overlay->priv;
unsigned int tmp;
tmp = readl(fbi->regs + LCDC_LGWCR);
tmp |= LGWCR_GWE;
writel(tmp , fbi->regs + LCDC_LGWCR);
}
static void imxfb_overlay_disable_controller(struct fb_info *overlay)
{
struct imxfb_info *fbi = overlay->priv;
unsigned int tmp;
tmp = readl(fbi->regs + LCDC_LGWCR);
tmp &= ~LGWCR_GWE;
writel(tmp , fbi->regs + LCDC_LGWCR);
}
static int imxfb_overlay_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
u_int trans, struct fb_info *info)
{
return 0;
}
static struct fb_ops imxfb_overlay_ops = {
.fb_setcolreg = imxfb_overlay_setcolreg,
.fb_enable = imxfb_overlay_enable_controller,
.fb_disable = imxfb_overlay_disable_controller,
};
static int imxfb_alpha_set(struct device_d *dev, struct param_d *param,
const char *val)
{
struct fb_info *overlay = dev->priv;
struct imxfb_info *fbi = overlay->priv;
int alpha;
unsigned int tmp;
alpha = simple_strtoul(val, NULL, 0);
alpha &= 0xff;
tmp = readl(fbi->regs + LCDC_LGWCR);
tmp &= ~LGWCR_GWAV(0xff);
tmp |= LGWCR_GWAV(alpha);
writel(tmp , fbi->regs + LCDC_LGWCR);
sprintf(fbi->alpha_string, "%d", alpha);
return 0;
}
static int imxfb_register_overlay(struct imxfb_info *fbi)
{
struct fb_info *overlay;
struct imxfb_rgb *rgb;
int ret;
overlay = &fbi->overlay;
overlay->priv = fbi;
overlay->mode = fbi->info.mode;
overlay->xres = fbi->info.xres;
overlay->yres = fbi->info.yres;
overlay->bits_per_pixel = fbi->info.bits_per_pixel;
overlay->fbops = &imxfb_overlay_ops;
overlay->screen_base = xzalloc(overlay->xres * overlay->yres *
(overlay->bits_per_pixel >> 3));
writel((unsigned long)overlay->screen_base, fbi->regs + LCDC_LGWSAR);
writel(SIZE_XMAX(overlay->xres) | SIZE_YMAX(overlay->yres),
fbi->regs + LCDC_LGWSR);
writel(VPW_VPW(overlay->xres * overlay->bits_per_pixel / 8 / 4),
fbi->regs + LCDC_LGWVPWR);
writel(0, fbi->regs + LCDC_LGWPR);
writel(LGWCR_GWAV(0x0), fbi->regs + LCDC_LGWCR);
switch (overlay->bits_per_pixel) {
case 32:
rgb = &def_rgb_18;
break;
case 16:
default:
if (fbi->pcr & PCR_TFT)
rgb = &def_rgb_16_tft;
else
rgb = &def_rgb_16_stn;
break;
case 8:
rgb = &def_rgb_8;
break;
}
/*
* Copy the RGB parameters for this display
* from the machine specific parameters.
*/
overlay->red = rgb->red;
overlay->green = rgb->green;
overlay->blue = rgb->blue;
overlay->transp = rgb->transp;
ret = register_framebuffer(overlay);
if (ret < 0) {
dev_err(fbi->dev, "failed to register framebuffer\n");
return ret;
}
fbi->param_alpha.set = imxfb_alpha_set;
fbi->param_alpha.name = "alpha";
sprintf(fbi->alpha_string, "%d", 0);
fbi->param_alpha.value = fbi->alpha_string;
dev_add_param(&overlay->dev, &fbi->param_alpha);
return 0;
}
#endif
static int imxfb_probe(struct device_d *dev)
{
struct imxfb_info *fbi;
@ -364,6 +502,11 @@ static int imxfb_probe(struct device_d *dev)
if (!pdata)
return -ENODEV;
#ifdef CONFIG_ARCH_IMX27
PCCR0 &= ~PCCR0_LCDC_EN;
PCCR1 &= ~PCCR1_HCLK_LCDC;
#endif
fbi = xzalloc(sizeof(*fbi));
info = &fbi->info;
@ -373,6 +516,7 @@ static int imxfb_probe(struct device_d *dev)
fbi->pwmr = pdata->pwmr;
fbi->lscr1 = pdata->lscr1;
fbi->dmacr = pdata->dmacr;
fbi->dev = dev;
info->priv = fbi;
info->mode = &pdata->mode->mode;
info->xres = pdata->mode->mode.xres;
@ -392,6 +536,10 @@ static int imxfb_probe(struct device_d *dev)
dev_err(dev, "failed to register framebuffer\n");
return ret;
}
#ifdef CONFIG_IMXFB_DRIVER_VIDEO_IMX_OVERLAY
imxfb_register_overlay(fbi);
#endif
imxfb_enable_controller(info);
return 0;
}