Пример #1
0
static int s3c_fb_blank(int blank_mode, struct fb_info *info)
{
	struct s3c_fb_win *win = info->par;
	struct s3c_fb *sfb = win->parent;
	unsigned int index = win->index;
	u32 wincon;

	dev_dbg(sfb->dev, "blank mode %d\n", blank_mode);

	pm_runtime_get_sync(sfb->dev);

	wincon = readl(sfb->regs + sfb->variant.wincon + (index * 4));

	switch (blank_mode) {
	case FB_BLANK_POWERDOWN:
		wincon &= ~WINCONx_ENWIN;
		sfb->enabled &= ~(1 << index);
		

	case FB_BLANK_NORMAL:
		
		shadow_protect_win(win, 1);
		writel(WINxMAP_MAP | WINxMAP_MAP_COLOUR(0x0),
		       sfb->regs + sfb->variant.winmap + (index * 4));
		shadow_protect_win(win, 0);
		break;

	case FB_BLANK_UNBLANK:
		shadow_protect_win(win, 1);
		writel(0x0, sfb->regs + sfb->variant.winmap + (index * 4));
		shadow_protect_win(win, 0);
		wincon |= WINCONx_ENWIN;
		sfb->enabled |= (1 << index);
		break;

	case FB_BLANK_VSYNC_SUSPEND:
	case FB_BLANK_HSYNC_SUSPEND:
	default:
		pm_runtime_put_sync(sfb->dev);
		return 1;
	}

	shadow_protect_win(win, 1);
	writel(wincon, sfb->regs + sfb->variant.wincon + (index * 4));
	shadow_protect_win(win, 0);



	if (index == sfb->pdata->default_win) {
		shadow_protect_win(win, 1);
		s3c_fb_enable(sfb, blank_mode != FB_BLANK_POWERDOWN ? 1 : 0);
		shadow_protect_win(win, 0);
	}

	pm_runtime_put_sync(sfb->dev);

	return 0;
}
Пример #2
0
/**
 * s3c_fb_blank() - blank or unblank the given window
 * @blank_mode: The blank state from FB_BLANK_*
 * @info: The framebuffer to blank.
 *
 * Framebuffer layer request to change the power state.
 */
static int s3c_fb_blank(int blank_mode, struct fb_info *info)
{
	struct s3c_fb_win *win = info->par;
	struct s3c_fb *sfb = win->parent;
	unsigned int index = win->index;
	u32 wincon;
	u32 output_on = sfb->output_on;

	dev_dbg(sfb->dev, "blank mode %d\n", blank_mode);

	pm_runtime_get_sync(sfb->dev);

	wincon = readl(sfb->regs + sfb->variant.wincon + (index * 4));

	switch (blank_mode) {
	case FB_BLANK_POWERDOWN:
		wincon &= ~WINCONx_ENWIN;
		sfb->enabled &= ~(1 << index);
		/* fall through to FB_BLANK_NORMAL */

	case FB_BLANK_NORMAL:
		/* disable the DMA and display 0x0 (black) */
		shadow_protect_win(win, 1);
		writel(WINxMAP_MAP | WINxMAP_MAP_COLOUR(0x0),
		       sfb->regs + sfb->variant.winmap + (index * 4));
		shadow_protect_win(win, 0);
		break;

	case FB_BLANK_UNBLANK:
		shadow_protect_win(win, 1);
		writel(0x0, sfb->regs + sfb->variant.winmap + (index * 4));
		shadow_protect_win(win, 0);
		wincon |= WINCONx_ENWIN;
		sfb->enabled |= (1 << index);
		break;

	case FB_BLANK_VSYNC_SUSPEND:
	case FB_BLANK_HSYNC_SUSPEND:
	default:
		pm_runtime_put_sync(sfb->dev);
		return 1;
	}

	shadow_protect_win(win, 1);
	writel(wincon, sfb->regs + sfb->variant.wincon + (index * 4));

	/* Check the enabled state to see if we need to be running the
	 * main LCD interface, as if there are no active windows then
	 * it is highly likely that we also do not need to output
	 * anything.
	 */
	s3c_fb_enable(sfb, sfb->enabled ? 1 : 0);
	shadow_protect_win(win, 0);

	pm_runtime_put_sync(sfb->dev);

	return output_on == sfb->output_on;
}
Пример #3
0
/**
 * s3c_fb_set_par() - framebuffer request to set new framebuffer state.
 * @info: The framebuffer to change.
 *
 * Framebuffer layer request to set a new mode for the specified framebuffer
 */
static int s3c_fb_set_par(struct fb_info *info)
{
	struct fb_var_screeninfo *var = &info->var;
	struct s3c_fb_win *win = info->par;
	struct s3c_fb *sfb = win->parent;
	void __iomem *regs = sfb->regs;
	void __iomem *buf = regs;
	int win_no = win->index;
	u32 alpha = 0;
	u32 data;
	u32 pagewidth;

	dev_dbg(sfb->dev, "setting framebuffer parameters\n");

	pm_runtime_get_sync(sfb->dev);

	shadow_protect_win(win, 1);

	switch (var->bits_per_pixel) {
	case 32:
	case 24:
	case 16:
	case 12:
		info->fix.visual = FB_VISUAL_TRUECOLOR;
		break;
	case 8:
		if (win->variant.palette_sz >= 256)
			info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		else
			info->fix.visual = FB_VISUAL_TRUECOLOR;
		break;
	case 1:
		info->fix.visual = FB_VISUAL_MONO01;
		break;
	default:
		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		break;
	}

	info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;

	info->fix.xpanstep = info->var.xres_virtual > info->var.xres ? 1 : 0;
	info->fix.ypanstep = info->var.yres_virtual > info->var.yres ? 1 : 0;

	/* disable the window whilst we update it */
	writel(0, regs + WINCON(win_no));

	if (!sfb->output_on)
		s3c_fb_enable(sfb, 1);

	/* write the buffer address */

	/* start and end registers stride is 8 */
	buf = regs + win_no * 8;

	writel(info->fix.smem_start, buf + sfb->variant.buf_start);

	data = info->fix.smem_start + info->fix.line_length * var->yres;
	writel(data, buf + sfb->variant.buf_end);

	pagewidth = (var->xres * var->bits_per_pixel) >> 3;
	data = VIDW_BUF_SIZE_OFFSET(info->fix.line_length - pagewidth) |
	       VIDW_BUF_SIZE_PAGEWIDTH(pagewidth) |
	       VIDW_BUF_SIZE_OFFSET_E(info->fix.line_length - pagewidth) |
	       VIDW_BUF_SIZE_PAGEWIDTH_E(pagewidth);
	writel(data, regs + sfb->variant.buf_size + (win_no * 4));

	/* write 'OSD' registers to control position of framebuffer */

	data = VIDOSDxA_TOPLEFT_X(0) | VIDOSDxA_TOPLEFT_Y(0) |
	       VIDOSDxA_TOPLEFT_X_E(0) | VIDOSDxA_TOPLEFT_Y_E(0);
	writel(data, regs + VIDOSD_A(win_no, sfb->variant));

	data = VIDOSDxB_BOTRIGHT_X(s3c_fb_align_word(var->bits_per_pixel,
						     var->xres - 1)) |
	       VIDOSDxB_BOTRIGHT_Y(var->yres - 1) |
	       VIDOSDxB_BOTRIGHT_X_E(s3c_fb_align_word(var->bits_per_pixel,
						     var->xres - 1)) |
	       VIDOSDxB_BOTRIGHT_Y_E(var->yres - 1);

	writel(data, regs + VIDOSD_B(win_no, sfb->variant));

	data = var->xres * var->yres;

	alpha = VIDISD14C_ALPHA1_R(0xf) |
		VIDISD14C_ALPHA1_G(0xf) |
		VIDISD14C_ALPHA1_B(0xf);

	vidosd_set_alpha(win, alpha);
	vidosd_set_size(win, data);

	/* Enable DMA channel for this window */
	if (sfb->variant.has_shadowcon) {
		data = readl(sfb->regs + SHADOWCON);
		data |= SHADOWCON_CHx_ENABLE(win_no);
		writel(data, sfb->regs + SHADOWCON);
	}

	data = WINCONx_ENWIN;
	sfb->enabled |= (1 << win->index);

	/* note, since we have to round up the bits-per-pixel, we end up
	 * relying on the bitfield information for r/g/b/a to work out
	 * exactly which mode of operation is intended. */

	switch (var->bits_p
Пример #4
0
static int s3c_fb_set_par(struct fb_info *info)
{
	struct fb_var_screeninfo *var = &info->var;
	struct s3c_fb_win *win = info->par;
	struct s3c_fb *sfb = win->parent;
	void __iomem *regs = sfb->regs;
	void __iomem *buf = regs;
	int win_no = win->index;
	u32 alpha = 0;
	u32 data;
	u32 pagewidth;
	int clkdiv;

	dev_dbg(sfb->dev, "setting framebuffer parameters\n");

	pm_runtime_get_sync(sfb->dev);

	shadow_protect_win(win, 1);

	switch (var->bits_per_pixel) {
	case 32:
	case 24:
	case 16:
	case 12:
		info->fix.visual = FB_VISUAL_TRUECOLOR;
		break;
	case 8:
		if (win->variant.palette_sz >= 256)
			info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		else
			info->fix.visual = FB_VISUAL_TRUECOLOR;
		break;
	case 1:
		info->fix.visual = FB_VISUAL_MONO01;
		break;
	default:
		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		break;
	}

	info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;

	info->fix.xpanstep = info->var.xres_virtual > info->var.xres ? 1 : 0;
	info->fix.ypanstep = info->var.yres_virtual > info->var.yres ? 1 : 0;

	
	writel(0, regs + WINCON(win_no));

	

	if (win_no == sfb->pdata->default_win) {
		clkdiv = s3c_fb_calc_pixclk(sfb, var->pixclock);

		data = sfb->pdata->vidcon0;
		data &= ~(VIDCON0_CLKVAL_F_MASK | VIDCON0_CLKDIR);

		if (clkdiv > 1)
			data |= VIDCON0_CLKVAL_F(clkdiv-1) | VIDCON0_CLKDIR;
		else
			data &= ~VIDCON0_CLKDIR;	

		

		if (sfb->variant.is_2443)
			data |= (1 << 5);

		writel(data, regs + VIDCON0);

		s3c_fb_enable(sfb, 1);

		data = VIDTCON0_VBPD(var->upper_margin - 1) |
		       VIDTCON0_VFPD(var->lower_margin - 1) |
		       VIDTCON0_VSPW(var->vsync_len - 1);

		writel(data, regs + sfb->variant.vidtcon);

		data = VIDTCON1_HBPD(var->left_margin - 1) |
		       VIDTCON1_HFPD(var->right_margin - 1) |
		       VIDTCON1_HSPW(var->hsync_len - 1);

		
		writel(data, regs + sfb->variant.vidtcon + 4);

		data = VIDTCON2_LINEVAL(var->yres - 1) |
		       VIDTCON2_HOZVAL(var->xres - 1) |
		       VIDTCON2_LINEVAL_E(var->yres - 1) |
		       VIDTCON2_HOZVAL_E(var->xres - 1);
		writel(data, regs + sfb->variant.vidtcon + 8);
	}

	

	
	buf = regs + win_no * 8;

	writel(info->fix.smem_start, buf + sfb->variant.buf_start);

	data = info->fix.smem_start + info->fix.line_length * var->yres;
	writel(data, buf + sfb->variant.buf_end);

	pagewidth = (var->xres * var->bits_per_pixel) >> 3;
	data = VIDW_BUF_SIZE_OFFSET(info->fix.line_length - pagewidth) |
	       VIDW_BUF_SIZE_PAGEWIDTH(pagewidth) |
	       VIDW_BUF_SIZE_OFFSET_E(info->fix.line_length - pagewidth) |
	       VIDW_BUF_SIZE_PAGEWIDTH_E(pagewidth);
	writel(data, regs + sfb->variant.buf_size + (win_no * 4));

	

	data = VIDOSDxA_TOPLEFT_X(0) | VIDOSDxA_TOPLEFT_Y(0) |
	       VIDOSDxA_TOPLEFT_X_E(0) | VIDOSDxA_TOPLEFT_Y_E(0);
	writel(data, regs + VIDOSD_A(win_no, sfb->variant));

	data = VIDOSDxB_BOTRIGHT_X(s3c_fb_align_word(var->bits_per_pixel,
						     var->xres - 1)) |
	       VIDOSDxB_BOTRIGHT_Y(var->yres - 1) |
	       VIDOSDxB_BOTRIGHT_X_E(s3c_fb_align_word(var->bits_per_pixel,
						     var->xres - 1)) |
	       VIDOSDxB_BOTRIGHT_Y_E(var->yres - 1);

	writel(data, regs + VIDOSD_B(win_no, sfb->variant));

	data = var->xres * var->yres;

	alpha = VIDISD14C_ALPHA1_R(0xf) |
		VIDISD14C_ALPHA1_G(0xf) |
		VIDISD14C_ALPHA1_B(0xf);

	vidosd_set_alpha(win, alpha);
	vidosd_set_size(win, data);

	
	if (sfb->variant.has_shadowcon) {
		data = readl(sfb->regs + SHADOWCON);
		data |= SHADOWCON_CHx_ENABLE(win_no);
		writel(data, sfb->regs + SHADOWCON);
	}

	data = WINCONx_ENWIN;
	sfb->enabled |= (1 << win->index);


	switch (var->bits_per_pixel) {
	case 1:
		data |= WINCON0_BPPMODE_1BPP;
		data |= WINCONx_BITSWP;
		data |= WINCONx_BURSTLEN_4WORD;
		break;
	case 2:
		data |= WINCON0_BPPMODE_2BPP;
		data |= WINCONx_BITSWP;
		data |= WINCONx_BURSTLEN_8WORD;
		break;
	case 4:
		data |= WINCON0_BPPMODE_4BPP;
		data |= WINCONx_BITSWP;
		data |= WINCONx_BURSTLEN_8WORD;
		break;
	case 8:
		if (var->transp.length != 0)
			data |= WINCON1_BPPMODE_8BPP_1232;
		else
			data |= WINCON0_BPPMODE_8BPP_PALETTE;
		data |= WINCONx_BURSTLEN_8WORD;
		data |= WINCONx_BYTSWP;
		break;
	case 16:
		if (var->transp.length != 0)
			data |= WINCON1_BPPMODE_16BPP_A1555;
		else
			data |= WINCON0_BPPMODE_16BPP_565;
		data |= WINCONx_HAWSWP;
		data |= WINCONx_BURSTLEN_16WORD;
		break;
	case 24:
	case 32:
		if (var->red.length == 6) {
			if (var->transp.length != 0)
				data |= WINCON1_BPPMODE_19BPP_A1666;
			else
				data |= WINCON1_BPPMODE_18BPP_666;
		} else if (var->transp.length == 1)
			data |= WINCON1_BPPMODE_25BPP_A1888
				| WINCON1_BLD_PIX;
		else if ((var->transp.length == 4) ||
			(var->transp.length == 8))
			data |= WINCON1_BPPMODE_28BPP_A4888
				| WINCON1_BLD_PIX | WINCON1_ALPHA_SEL;
		else
			data |= WINCON0_BPPMODE_24BPP_888;

		data |= WINCONx_WSWP;
		data |= WINCONx_BURSTLEN_16WORD;
		break;
	}

	
	if (win_no > 0) {
		u32 keycon0_data = 0, keycon1_data = 0;
		void __iomem *keycon = regs + sfb->variant.keycon;

		keycon0_data = ~(WxKEYCON0_KEYBL_EN |
				WxKEYCON0_KEYEN_F |
				WxKEYCON0_DIRCON) | WxKEYCON0_COMPKEY(0);

		keycon1_data = WxKEYCON1_COLVAL(0xffffff);

		keycon += (win_no - 1) * 8;

		writel(keycon0_data, keycon + WKEYCON0);
		writel(keycon1_data, keycon + WKEYCON1);
	}

	writel(data, regs + sfb->variant.wincon + (win_no * 4));
	writel(0x0, regs + sfb->variant.winmap + (win_no * 4));

	
	if (sfb->variant.has_blendcon) {
		data = readl(sfb->regs + BLENDCON);
		data &= ~BLENDCON_NEW_MASK;
		if (var->transp.length > 4)
			data |= BLENDCON_NEW_8BIT_ALPHA_VALUE;
		else
			data |= BLENDCON_NEW_4BIT_ALPHA_VALUE;
		writel(data, sfb->regs + BLENDCON);
	}

	shadow_protect_win(win, 0);

	pm_runtime_put_sync(sfb->dev);

	return 0;
}
Пример #5
0
/**
 * s3c_fb_set_par() - framebuffer request to set new framebuffer state.
 * @info: The framebuffer to change.
 *
 * Framebuffer layer request to set a new mode for the specified framebuffer
 */
static int s3c_fb_set_par(struct fb_info *info)
{
	struct fb_var_screeninfo *var = &info->var;
	struct s3c_fb_win *win = info->par;
	struct s3c_fb *sfb = win->parent;
	void __iomem *regs = sfb->regs;
	void __iomem *buf = regs;
	int win_no = win->index;
	u32 alpha = 0;
	u32 data;
	u32 pagewidth;
	int clkdiv;

	dev_dbg(sfb->dev, "setting framebuffer parameters\n");

	shadow_protect_win(win, 1);

	switch (var->bits_per_pixel) {
	case 32:
	case 24:
	case 16:
	case 12:
		info->fix.visual = FB_VISUAL_TRUECOLOR;
		break;
	case 8:
		if (win->variant.palette_sz >= 256)
			info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		else
			info->fix.visual = FB_VISUAL_TRUECOLOR;
		break;
	case 1:
		info->fix.visual = FB_VISUAL_MONO01;
		break;
	default:
		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		break;
	}

	info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;

	info->fix.xpanstep = info->var.xres_virtual > info->var.xres ? 1 : 0;
	info->fix.ypanstep = info->var.yres_virtual > info->var.yres ? 1 : 0;

	/* disable the window whilst we update it */
	writel(0, regs + WINCON(win_no));

	/* use platform specified window as the basis for the lcd timings */

	if (win_no == sfb->pdata->default_win) {
		clkdiv = s3c_fb_calc_pixclk(sfb, var->pixclock);

		data = sfb->pdata->vidcon0;
		data &= ~(VIDCON0_CLKVAL_F_MASK | VIDCON0_CLKDIR);

		if (clkdiv > 1)
			data |= VIDCON0_CLKVAL_F(clkdiv-1) | VIDCON0_CLKDIR;
		else
			data &= ~VIDCON0_CLKDIR;	/* 1:1 clock */

		/* write the timing data to the panel */

		if (sfb->variant.is_2443)
			data |= (1 << 5);

		data |= VIDCON0_ENVID | VIDCON0_ENVID_F;
		writel(data, regs + VIDCON0);

		data = VIDTCON0_VBPD(var->upper_margin - 1) |
		       VIDTCON0_VFPD(var->lower_margin - 1) |
		       VIDTCON0_VSPW(var->vsync_len - 1);

		writel(data, regs + sfb->variant.vidtcon);

		data = VIDTCON1_HBPD(var->left_margin - 1) |
		       VIDTCON1_HFPD(var->right_margin - 1) |
		       VIDTCON1_HSPW(var->hsync_len - 1);

		/* VIDTCON1 */
		writel(data, regs + sfb->variant.vidtcon + 4);

		data = VIDTCON2_LINEVAL(var->yres - 1) |
		       VIDTCON2_HOZVAL(var->xres - 1);
		writel(data, regs +sfb->variant.vidtcon + 8 );
	}

	/* write the buffer address */

	/* start and end registers stride is 8 */
	buf = regs + win_no * 8;

	writel(info->fix.smem_start, buf + sfb->variant.buf_start);

	data = info->fix.smem_start + info->fix.line_length * var->yres;
	writel(data, buf + sfb->variant.buf_end);

	pagewidth = (var->xres * var->bits_per_pixel) >> 3;
	data = VIDW_BUF_SIZE_OFFSET(info->fix.line_length - pagewidth) |
	       VIDW_BUF_SIZE_PAGEWIDTH(pagewidth);
	writel(data, regs + sfb->variant.buf_size + (win_no * 4));

	/* write 'OSD' registers to control position of framebuffer */

	data = VIDOSDxA_TOPLEFT_X(0) | VIDOSDxA_TOPLEFT_Y(0);
	writel(data, regs + VIDOSD_A(win_no, sfb->variant));

	data = VIDOSDxB_BOTRIGHT_X(s3c_fb_align_word(var->bits_per_pixel,
						     var->xres - 1)) |
	       VIDOSDxB_BOTRIGHT_Y(var->yres - 1);

	writel(data, regs + VIDOSD_B(win_no, sfb->variant));

	data = var->xres * var->yres;

	alpha = VIDISD14C_ALPHA1_R(0xf) |
		VIDISD14C_ALPHA1_G(0xf) |
		VIDISD14C_ALPHA1_B(0xf);

	vidosd_set_alpha(win, alpha);
	vidosd_set_size(win, data);

	data = WINCONx_ENWIN;

	/* note, since we have to round up the bits-per-pixel, we end up
	 * relying on the bitfield information for r/g/b/a to work out
	 * exactly which mode of operation is intended. */

	switch (var->bits_per_pixel) {
	case 1:
		data |= WINCON0_BPPMODE_1BPP;
		data |= WINCONx_BITSWP;
		data |= WINCONx_BURSTLEN_4WORD;
		break;
	case 2:
		data |= WINCON0_BPPMODE_2BPP;
		data |= WINCONx_BITSWP;
		data |= WINCONx_BURSTLEN_8WORD;
		break;
	case 4:
		data |= WINCON0_BPPMODE_4BPP;
		data |= WINCONx_BITSWP;
		data |= WINCONx_BURSTLEN_8WORD;
		break;
	case 8:
		if (var->transp.length != 0)
			data |= WINCON1_BPPMODE_8BPP_1232;
		else
			data |= WINCON0_BPPMODE_8BPP_PALETTE;
		data |= WINCONx_BURSTLEN_8WORD;
		data |= WINCONx_BYTSWP;
		break;
	case 16:
		if (var->transp.length != 0)
			data |= WINCON1_BPPMODE_16BPP_A1555;
		else
			data |= WINCON0_BPPMODE_16BPP_565;
		data |= WINCONx_HAWSWP;
		data |= WINCONx_BURSTLEN_16WORD;
		break;
	case 24:
	case 32:
		if (var->red.length == 6) {
			if (var->transp.length != 0)
				data |= WINCON1_BPPMODE_19BPP_A1666;
			else
				data |= WINCON1_BPPMODE_18BPP_666;
		} else if (var->transp.length == 1)
			data |= WINCON1_BPPMODE_25BPP_A1888
				| WINCON1_BLD_PIX;
		else if (var->transp.length == 4)
			data |= WINCON1_BPPMODE_28BPP_A4888
				| WINCON1_BLD_PIX | WINCON1_ALPHA_SEL;
		else
			data |= WINCON0_BPPMODE_24BPP_888;

		data |= WINCONx_WSWP;
		data |= WINCONx_BURSTLEN_16WORD;
		break;
	}

	/* Enable the colour keying for the window below this one */
	if (win_no > 0) {
		u32 keycon0_data = 0, keycon1_data = 0;
		void __iomem *keycon = regs + sfb->variant.keycon;

		keycon0_data = ~(WxKEYCON0_KEYBL_EN |
				WxKEYCON0_KEYEN_F |
				WxKEYCON0_DIRCON) | WxKEYCON0_COMPKEY(0);

		keycon1_data = WxKEYCON1_COLVAL(0xffffff);

		keycon += (win_no - 1) * 8;

		writel(keycon0_data, keycon + WKEYCON0);
		writel(keycon1_data, keycon + WKEYCON1);
	}

	writel(data, regs + sfb->variant.wincon + (win_no * 4));
	writel(0x0, regs + sfb->variant.winmap + (win_no * 4));

	/* Enable DMA channel for this window */
	if (sfb->variant.has_shadowcon) {
		data = readl(sfb->regs + SHADOWCON);
		data |= SHADOWCON_CHx_ENABLE(win_no);
		writel(data, sfb->regs + SHADOWCON);
	}

	shadow_protect_win(win, 0);

	return 0;
}
Пример #6
0
/**
 * s3c_fb_set_par() - framebuffer request to set new framebuffer state.
 * @info: The framebuffer to change.
 *
 * Framebuffer layer request to set a new mode for the specified framebuffer
 */
static int s3c_fb_set_par(struct fb_info *info)
{
	struct fb_var_screeninfo *var = &info->var;
	struct s3c_fb_win *win = info->par;
	struct s3c_fb *sfb = win->parent;
	void __iomem *regs = sfb->regs;
	void __iomem *buf = regs;
	int win_no = win->index;
	u32 alpha = 0;
	u32 data;
	u32 pagewidth;

	dev_dbg(sfb->dev, "setting framebuffer parameters\n");

	pm_runtime_get_sync(sfb->dev);

	shadow_protect_win(win, 1);

	switch (var->bits_per_pixel) {
	case 32:
	case 24:
	case 16:
	case 12:
		info->fix.visual = FB_VISUAL_TRUECOLOR;
		break;
	case 8:
		if (win->variant.palette_sz >= 256)
			info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		else
			info->fix.visual = FB_VISUAL_TRUECOLOR;
		break;
	case 1:
		info->fix.visual = FB_VISUAL_MONO01;
		break;
	default:
		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
		break;
	}

	info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;

	info->fix.xpanstep = info->var.xres_virtual > info->var.xres ? 1 : 0;
	info->fix.ypanstep = info->var.yres_virtual > info->var.yres ? 1 : 0;

	/* disable the window whilst we update it */
	writel(0, regs + WINCON(win_no));

	if (!sfb->output_on)
		s3c_fb_enable(sfb, 1);

	/* write the buffer address */

	/* start and end registers stride is 8 */
	buf = regs + win_no * 8;

	writel(info->fix.smem_start, buf + sfb->variant.buf_start);

	data = info->fix.smem_start + info->fix.line_length * var->yres;
	writel(data, buf + sfb->variant.buf_end);

	pagewidth = (var->xres * var->bits_per_pixel) >> 3;
	data = VIDW_BUF_SIZE_OFFSET(info->fix.line_length - pagewidth) |
	       VIDW_BUF_SIZE_PAGEWIDTH(pagewidth) |
	       VIDW_BUF_SIZE_OFFSET_E(info->fix.line_length - pagewidth) |
	       VIDW_BUF_SIZE_PAGEWIDTH_E(pagewidth);
	writel(data, regs + sfb->variant.buf_size + (win_no * 4));

	/* write 'OSD' registers to control position of framebuffer */

	data = VIDOSDxA_TOPLEFT_X(0) | VIDOSDxA_TOPLEFT_Y(0) |
	       VIDOSDxA_TOPLEFT_X_E(0) | VIDOSDxA_TOPLEFT_Y_E(0);
	writel(data, regs + VIDOSD_A(win_no, sfb->variant));

	data = VIDOSDxB_BOTRIGHT_X(s3c_fb_align_word(var->bits_per_pixel,
						     var->xres - 1)) |
	       VIDOSDxB_BOTRIGHT_Y(var->yres - 1) |
	       VIDOSDxB_BOTRIGHT_X_E(s3c_fb_align_word(var->bits_per_pixel,
						     var->xres - 1)) |
	       VIDOSDxB_BOTRIGHT_Y_E(var->yres - 1);

	writel(data, regs + VIDOSD_B(win_no, sfb->variant));

	data = var->xres * var->yres;

	alpha = VIDISD14C_ALPHA1_R(0xf) |
		VIDISD14C_ALPHA1_G(0xf) |
		VIDISD14C_ALPHA1_B(0xf);

	vidosd_set_alpha(win, alpha);
	vidosd_set_size(win, data);

	/* Enable DMA channel for this window */
	if (sfb->variant.has_shadowcon) {
		data = readl(sfb->regs + SHADOWCON);
		data |= SHADOWCON_CHx_ENABLE(win_no);
		writel(data, sfb->regs + SHADOWCON);
	}

	data = WINCONx_ENWIN;
	sfb->enabled |= (1 << win->index);

	/* note, since we have to round up the bits-per-pixel, we end up
	 * relying on the bitfield information for r/g/b/a to work out
	 * exactly which mode of operation is intended. */

	switch (var->bits_per_pixel) {
	case 1:
		data |= WINCON0_BPPMODE_1BPP;
		data |= WINCONx_BITSWP;
		data |= WINCONx_BURSTLEN_4WORD;
		break;
	case 2:
		data |= WINCON0_BPPMODE_2BPP;
		data |= WINCONx_BITSWP;
		data |= WINCONx_BURSTLEN_8WORD;
		break;
	case 4:
		data |= WINCON0_BPPMODE_4BPP;
		data |= WINCONx_BITSWP;
		data |= WINCONx_BURSTLEN_8WORD;
		break;
	case 8:
		if (var->transp.length != 0)
			data |= WINCON1_BPPMODE_8BPP_1232;
		else
			data |= WINCON0_BPPMODE_8BPP_PALETTE;
		data |= WINCONx_BURSTLEN_8WORD;
		data |= WINCONx_BYTSWP;
		break;
	case 16:
		if (var->transp.length != 0)
			data |= WINCON1_BPPMODE_16BPP_A1555;
		else
			data |= WINCON0_BPPMODE_16BPP_565;
		data |= WINCONx_HAWSWP;
		data |= WINCONx_BURSTLEN_16WORD;
		break;
	case 24:
	case 32:
		if (var->red.length == 6) {
			if (var->transp.length != 0)
				data |= WINCON1_BPPMODE_19BPP_A1666;
			else
				data |= WINCON1_BPPMODE_18BPP_666;
		} else if (var->transp.length == 1)
			data |= WINCON1_BPPMODE_25BPP_A1888
				| WINCON1_BLD_PIX;
		else if ((var->transp.length == 4) ||
			(var->transp.length == 8))
			data |= WINCON1_BPPMODE_28BPP_A4888
				| WINCON1_BLD_PIX | WINCON1_ALPHA_SEL;
		else
			data |= WINCON0_BPPMODE_24BPP_888;

		data |= WINCONx_WSWP;
		data |= WINCONx_BURSTLEN_16WORD;
		break;
	}

	/* Enable the colour keying for the window below this one */
	if (win_no > 0) {
		u32 keycon0_data = 0, keycon1_data = 0;
		void __iomem *keycon = regs + sfb->variant.keycon;

		keycon0_data = ~(WxKEYCON0_KEYBL_EN |
				WxKEYCON0_KEYEN_F |
				WxKEYCON0_DIRCON) | WxKEYCON0_COMPKEY(0);

		keycon1_data = WxKEYCON1_COLVAL(0xffffff);

		keycon += (win_no - 1) * 8;

		writel(keycon0_data, keycon + WKEYCON0);
		writel(keycon1_data, keycon + WKEYCON1);
	}

	writel(data, regs + sfb->variant.wincon + (win_no * 4));
	writel(0x0, regs + sfb->variant.winmap + (win_no * 4));

	/* Set alpha value width */
	if (sfb->variant.has_blendcon) {
		data = readl(sfb->regs + BLENDCON);
		data &= ~BLENDCON_NEW_MASK;
		if (var->transp.length > 4)
			data |= BLENDCON_NEW_8BIT_ALPHA_VALUE;
		else
			data |= BLENDCON_NEW_4BIT_ALPHA_VALUE;
		writel(data, sfb->regs + BLENDCON);
	}

	shadow_protect_win(win, 0);

	pm_runtime_put_sync(sfb->dev);

	return 0;
}