Merge branch 's3c64xx-drivers' into s3c64xx

4 files changed, 1027 insertions, 4 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 3f3ce13fef4..8de5c0cfb81 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -1918,6 +1918,30 @@ config FB_TMIO_ACCELL
 	depends on FB_TMIO
 	default y
 
+config FB_S3C
+	tristate "Samsung S3C framebuffer support"
+	depends on FB && ARCH_S3C64XX
+	select FB_CFB_FILLRECT
+	select FB_CFB_COPYAREA
+	select FB_CFB_IMAGEBLIT
+	---help---
+	  Frame buffer driver for the built-in FB controller in the Samsung
+	  SoC line from the S3C2443 onwards, including the S3C2416, S3C2450,
+	  and the S3C64XX series such as the S3C6400 and S3C6410.
+
+	  These chips all have the same basic framebuffer design with the
+	  actual capabilities depending on the chip. For instance the S3C6400
+	  and S3C6410 support 4 hardware windows whereas the S3C24XX series
+	  currently only have two.
+
+	  Currently the support is only for the S3C6400 and S3C6410 SoCs.
+
+config FB_S3C_DEBUG_REGWRITE
+       bool "Debug register writes"
+       depends on FB_S3C
+       ---help---
+         Show all register writes via printk(KERN_DEBUG)
+
 config FB_S3C2410
 	tristate "S3C2410 LCD framebuffer support"
 	depends on FB && ARCH_S3C2410
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index e39e33e797d..d9eaf14557f 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -109,6 +109,7 @@ obj-$(CONFIG_FB_METRONOME)        += metronomefb.o
 obj-$(CONFIG_FB_S1D13XXX)	  += s1d13xxxfb.o
 obj-$(CONFIG_FB_SH7760)		  += sh7760fb.o
 obj-$(CONFIG_FB_IMX)              += imxfb.o
+obj-$(CONFIG_FB_S3C)		  += s3c-fb.o
 obj-$(CONFIG_FB_S3C2410)	  += s3c2410fb.o
 obj-$(CONFIG_FB_FSL_DIU)	  += fsl-diu-fb.o
 obj-$(CONFIG_FB_COBALT)           += cobalt_lcdfb.o
diff --git a/drivers/video/backlight/lcd.c b/drivers/video/backlight/lcd.c
index 8e1731d3b22..680e57b616c 100644
--- a/drivers/video/backlight/lcd.c
+++ b/drivers/video/backlight/lcd.c
@@ -42,10 +42,13 @@ static int fb_notifier_callback(struct notifier_block *self,
 
 	mutex_lock(&ld->ops_lock);
 	if (!ld->ops->check_fb || ld->ops->check_fb(ld, evdata->info)) {
-		if (event == FB_EVENT_BLANK)
-			ld->ops->set_power(ld, *(int *)evdata->data);
-		else
-			ld->ops->set_mode(ld, evdata->data);
+		if (event == FB_EVENT_BLANK) {
+			if (ld->ops->set_power)
+				ld->ops->set_power(ld, *(int *)evdata->data);
+		} else {
+			if (ld->ops->set_mode)
+				ld->ops->set_mode(ld, evdata->data);
+		}
 	}
 	mutex_unlock(&ld->ops_lock);
 	return 0;
diff --git a/drivers/video/s3c-fb.c b/drivers/video/s3c-fb.c
new file mode 100644
index 00000000000..9ffb6b68a8e
--- /dev/null
+++ b/drivers/video/s3c-fb.c
@@ -0,0 +1,995 @@
+/* linux/drivers/video/s3c-fb.c
+ *
+ * Copyright 2008 Openmoko Inc.
+ * Copyright 2008 Simtec Electronics
+ *      Ben Dooks <ben@simtec.co.uk>
+ *      http://armlinux.simtec.co.uk/
+ *
+ * Samsung SoC Framebuffer driver
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/gfp.h>
+#include <linux/clk.h>
+#include <linux/fb.h>
+#include <linux/io.h>
+
+#include <mach/map.h>
+#include <mach/regs-fb.h>
+#include <plat/fb.h>
+
+/* This driver will export a number of framebuffer interfaces depending
+ * on the configuration passed in via the platform data. Each fb instance
+ * maps to a hardware window. Currently there is no support for runtime
+ * setting of the alpha-blending functions that each window has, so only
+ * window 0 is actually useful.
+ *
+ * Window 0 is treated specially, it is used for the basis of the LCD
+ * output timings and as the control for the output power-down state.
+*/
+
+/* note, some of the functions that get called are derived from including
+ * <mach/regs-fb.h> as they are specific to the architecture that the code
+ * is being built for.
+*/
+
+#ifdef CONFIG_FB_S3C_DEBUG_REGWRITE
+#undef writel
+#define writel(v, r) do { \
+	printk(KERN_DEBUG "%s: %08x => %p\n", __func__, (unsigned int)v, r); \
+	__raw_writel(v, r); } while(0)
+#endif /* FB_S3C_DEBUG_REGWRITE */
+
+struct s3c_fb;
+
+/**
+ * struct s3c_fb_win - per window private data for each framebuffer.
+ * @windata: The platform data supplied for the window configuration.
+ * @parent: The hardware that this window is part of.
+ * @fbinfo: Pointer pack to the framebuffer info for this window.
+ * @palette_buffer: Buffer/cache to hold palette entries.
+ * @pseudo_palette: For use in TRUECOLOUR modes for entries 0..15/
+ * @index: The window number of this window.
+ * @palette: The bitfields for changing r/g/b into a hardware palette entry.
+ */
+struct s3c_fb_win {
+	struct s3c_fb_pd_win	*windata;
+	struct s3c_fb		*parent;
+	struct fb_info		*fbinfo;
+	struct s3c_fb_palette	 palette;
+
+	u32			*palette_buffer;
+	u32			 pseudo_palette[16];
+	unsigned int		 index;
+};
+
+/**
+ * struct s3c_fb - overall hardware state of the hardware
+ * @dev: The device that we bound to, for printing, etc.
+ * @regs_res: The resource we claimed for the IO registers.
+ * @bus_clk: The clk (hclk) feeding our interface and possibly pixclk.
+ * @regs: The mapped hardware registers.
+ * @enabled: A bitmask of enabled hardware windows.
+ * @pdata: The platform configuration data passed with the device.
+ * @windows: The hardware windows that have been claimed.
+ */
+struct s3c_fb {
+	struct device		*dev;
+	struct resource		*regs_res;
+	struct clk		*bus_clk;
+	void __iomem		*regs;
+
+	unsigned char		 enabled;
+
+	struct s3c_fb_platdata	*pdata;
+	struct s3c_fb_win	*windows[S3C_FB_MAX_WIN];
+};
+
+/**
+ * s3c_fb_win_has_palette() - determine if a mode has a palette
+ * @win: The window number being queried.
+ * @bpp: The number of bits per pixel to test.
+ *
+ * Work out if the given window supports palletised data at the specified bpp.
+ */
+static int s3c_fb_win_has_palette(unsigned int win, unsigned int bpp)
+{
+	return s3c_fb_win_pal_size(win) <= (1 << bpp);
+}
+
+/**
+ * s3c_fb_check_var() - framebuffer layer request to verify a given mode.
+ * @var: The screen information to verify.
+ * @info: The framebuffer device.
+ *
+ * Framebuffer layer call to verify the given information and allow us to
+ * update various information depending on the hardware capabilities.
+ */
+static int s3c_fb_check_var(struct fb_var_screeninfo *var,
+			    struct fb_info *info)
+{
+	struct s3c_fb_win *win = info->par;
+	struct s3c_fb_pd_win *windata = win->windata;
+	struct s3c_fb *sfb = win->parent;
+
+	dev_dbg(sfb->dev, "checking parameters\n");
+
+	var->xres_virtual = max((unsigned int)windata->virtual_x, var->xres);
+	var->yres_virtual = max((unsigned int)windata->virtual_y, var->yres);
+
+	if (!s3c_fb_validate_win_bpp(win->index, var->bits_per_pixel)) {
+		dev_dbg(sfb->dev, "win %d: unsupported bpp %d\n",
+			win->index, var->bits_per_pixel);
+		return -EINVAL;
+	}
+
+	/* always ensure these are zero, for drop through cases below */
+	var->transp.offset = 0;
+	var->transp.length = 0;
+
+	switch (var->bits_per_pixel) {
+	case 1:
+	case 2:
+	case 4:
+	case 8:
+		if (!s3c_fb_win_has_palette(win->index, var->bits_per_pixel)) {
+			/* non palletised, A:1,R:2,G:3,B:2 mode */
+			var->red.offset		= 4;
+			var->green.offset	= 2;
+			var->blue.offset	= 0;
+			var->red.length		= 5;
+			var->green.length	= 3;
+			var->blue.length	= 2;
+			var->transp.offset	= 7;
+			var->transp.length	= 1;
+		} else {
+			var->red.offset	= 0;
+			var->red.length	= var->bits_per_pixel;
+			var->green	= var->red;
+			var->blue	= var->red;
+		}
+		break;
+
+	case 19:
+		/* 666 with one bit alpha/transparency */
+		var->transp.offset	= 18;
+		var->transp.length	= 1;
+	case 18:
+		var->bits_per_pixel	= 32;
+
+		/* 666 format */
+		var->red.offset		= 12;
+		var->green.offset	= 6;
+		var->blue.offset	= 0;
+		var->red.length		= 6;
+		var->green.length	= 6;
+		var->blue.length	= 6;
+		break;
+
+	case 16:
+		/* 16 bpp, 565 format */
+		var->red.offset		= 11;
+		var->green.offset	= 5;
+		var->blue.offset	= 0;
+		var->red.length		= 5;
+		var->green.length	= 6;
+		var->blue.length	= 5;
+		break;
+
+	case 28:
+	case 25:
+		var->transp.length	= var->bits_per_pixel - 24;
+		var->transp.offset	= 24;
+		/* drop through */
+	case 24:
+		/* our 24bpp is unpacked, so 32bpp */
+		var->bits_per_pixel	= 32;
+	case 32:
+		var->red.offset		= 16;
+		var->red.length		= 8;
+		var->green.offset	= 8;
+		var->green.length	= 8;
+		var->blue.offset	= 0;
+		var->blue.length	= 8;
+		break;
+
+	default:
+		dev_err(sfb->dev, "invalid bpp\n");
+	}
+
+	dev_dbg(sfb->dev, "%s: verified parameters\n", __func__);
+	return 0;
+}
+
+/**
+ * s3c_fb_calc_pixclk() - calculate the divider to create the pixel clock.
+ * @sfb: The hardware state.
+ * @pixclock: The pixel clock wanted, in picoseconds.
+ *
+ * Given the specified pixel clock, work out the necessary divider to get
+ * close to the output frequency.
+ */
+static int s3c_fb_calc_pixclk(struct s3c_fb *sfb, unsigned int pixclk)
+{
+	unsigned long clk = clk_get_rate(sfb->bus_clk);
+	unsigned long long tmp;
+	unsigned int result;
+
+	tmp = (unsigned long long)clk;
+	tmp *= pixclk;
+
+	do_div(tmp, 1000000000UL);
+	result = (unsigned int)tmp / 1000;
+
+	dev_dbg(sfb->dev, "pixclk=%u, clk=%lu, div=%d (%lu)\n",
+		pixclk, clk, result, clk / result);
+
+	return result;
+}
+
+/**
+ * s3c_fb_align_word() - align pixel count to word boundary
+ * @bpp: The number of bits per pixel
+ * @pix: The value to be aligned.
+ *
+ * Align the given pixel count so that it will start on an 32bit word
+ * boundary.
+ */
+static int s3c_fb_align_word(unsigned int bpp, unsigned int pix)
+{
+	int pix_per_word;
+
+	if (bpp > 16)
+		return pix;
+
+	pix_per_word = (8 * 32) / bpp;
+	return ALIGN(pix, pix_per_word);
+}
+
+/**
+ * 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;
+	int win_no = win->index;
+	u32 data;
+	u32 pagewidth;
+	int clkdiv;
+
+	dev_dbg(sfb->dev, "setting framebuffer parameters\n");
+
+	switch (var->bits_per_pixel) {
+	case 32:
+	case 24:
+	case 16:
+	case 12:
+		info->fix.visual = FB_VISUAL_TRUECOLOR;
+		break;
+	case 8:
+		if (s3c_fb_win_has_palette(win_no, 8))
+			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;
+
+	/* disable the window whilst we update it */
+	writel(0, regs + WINCON(win_no));
+
+	/* use window 0 as the basis for the lcd output timings */
+
+	if (win_no == 0) {
+		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 */
+
+		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 + VIDTCON0);
+
+		data = VIDTCON1_HBPD(var->left_margin - 1) |
+		       VIDTCON1_HFPD(var->right_margin - 1) |
+		       VIDTCON1_HSPW(var->hsync_len - 1);
+
+		writel(data, regs + VIDTCON1);
+
+		data = VIDTCON2_LINEVAL(var->yres - 1) |
+		       VIDTCON2_HOZVAL(var->xres - 1);
+		writel(data, regs + VIDTCON2);
+	}
+
+	/* write the buffer address */
+
+	writel(info->fix.smem_start, regs + VIDW_BUF_START(win_no));
+
+	data = info->fix.smem_start + info->fix.line_length * var->yres;
+	writel(data, regs + VIDW_BUF_END(win_no));
+
+	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 + VIDW_BUF_SIZE(win_no));
+
+	/* write 'OSD' registers to control position of framebuffer */
+
+	data = VIDOSDxA_TOPLEFT_X(0) | VIDOSDxA_TOPLEFT_Y(0);
+	writel(data, regs + VIDOSD_A(win_no));
+
+	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));
+
+	data = var->xres * var->yres;
+	if (s3c_fb_has_osd_d(win_no)) {
+		writel(data, regs + VIDOSD_D(win_no));
+		writel(0, regs + VIDOSD_C(win_no));
+	} else
+		writel(data, regs + VIDOSD_C(win_no));
+
+	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 != 0)
+			data |= WINCON1_BPPMODE_25BPP_A1888;
+		else
+			data |= WINCON0_BPPMODE_24BPP_888;
+
+		data |= WINCONx_BURSTLEN_16WORD;
+		break;
+	}
+
+	writel(data, regs + WINCON(win_no));
+	writel(0x0, regs + WINxMAP(win_no));
+
+	return 0;
+}
+
+/**
+ * s3c_fb_update_palette() - set or schedule a palette update.
+ * @sfb: The hardware information.
+ * @win: The window being updated.
+ * @reg: The palette index being changed.
+ * @value: The computed palette value.
+ *
+ * Change the value of a palette register, either by directly writing to
+ * the palette (this requires the palette RAM to be disconnected from the
+ * hardware whilst this is in progress) or schedule the update for later.
+ *
+ * At the moment, since we have no VSYNC interrupt support, we simply set
+ * the palette entry directly.
+ */
+static void s3c_fb_update_palette(struct s3c_fb *sfb,
+				  struct s3c_fb_win *win,
+				  unsigned int reg,
+				  u32 value)
+{
+	void __iomem *palreg;
+	u32 palcon;
+
+	palreg = sfb->regs + s3c_fb_pal_reg(win->index, reg);
+
+	dev_dbg(sfb->dev, "%s: win %d, reg %d (%p): %08x\n",
+		__func__, win->index, reg, palreg, value);
+
+	win->palette_buffer[reg] = value;
+
+	palcon = readl(sfb->regs + WPALCON);
+	writel(palcon | WPALCON_PAL_UPDATE, sfb->regs + WPALCON);
+
+	if (s3c_fb_pal_is16(win->index))
+		writew(value, palreg);
+	else
+		writel(value, palreg);
+
+	writel(palcon, sfb->regs + WPALCON);
+}
+
+static inline unsigned int chan_to_field(unsigned int chan,
+					 struct fb_bitfield *bf)
+{
+	chan &= 0xffff;
+	chan >>= 16 - bf->length;
+	return chan << bf->offset;
+}
+
+/**
+ * s3c_fb_setcolreg() - framebuffer layer request to change palette.
+ * @regno: The palette index to change.
+ * @red: The red field for the palette data.
+ * @green: The green field for the palette data.
+ * @blue: The blue field for the palette data.
+ * @trans: The transparency (alpha) field for the palette data.
+ * @info: The framebuffer being changed.
+ */
+static int s3c_fb_setcolreg(unsigned regno,
+			    unsigned red, unsigned green, unsigned blue,
+			    unsigned transp, struct fb_info *info)
+{
+	struct s3c_fb_win *win = info->par;
+	struct s3c_fb *sfb = win->parent;
+	unsigned int val;
+
+	dev_dbg(sfb->dev, "%s: win %d: %d => rgb=%d/%d/%d\n",
+		__func__, win->index, regno, red, green, blue);
+
+	switch (info->fix.visual) {
+	case FB_VISUAL_TRUECOLOR:
+		/* true-colour, use pseudo-palette */
+
+		if (regno < 16) {
+			u32 *pal = info->pseudo_palette;
+
+			val  = chan_to_field(red,   &info->var.red);
+			val |= chan_to_field(green, &info->var.green);
+			val |= chan_to_field(blue,  &info->var.blue);
+
+			pal[regno] = val;
+		}
+		break;
+
+	case FB_VISUAL_PSEUDOCOLOR:
+		if (regno < s3c_fb_win_pal_size(win->index)) {
+			val  = chan_to_field(red, &win->palette.r);
+			val |= chan_to_field(green, &win->palette.g);
+			val |= chan_to_field(blue, &win->palette.b);
+
+			s3c_fb_update_palette(sfb, win, regno, val);
+		}
+
+		break;
+
+	default:
+		return 1;	/* unknown type */
+	}
+
+	return 0;
+}
+
+/**
+ * s3c_fb_enable() - Set the state of the main LCD output
+ * @sfb: The main framebuffer state.
+ * @enable: The state to set.
+ */
+static void s3c_fb_enable(struct s3c_fb *sfb, int enable)
+{
+	u32 vidcon0 = readl(sfb->regs + VIDCON0);
+
+	if (enable)
+		vidcon0 |= VIDCON0_ENVID | VIDCON0_ENVID_F;
+	else {
+		/* see the note in the framebuffer datasheet about
+		 * why you cannot take both of these bits down at the
+		 * same time. */
+
+		if (!(vidcon0 & VIDCON0_ENVID))
+			return;
+
+		vidcon0 |= VIDCON0_ENVID;
+		vidcon0 &= ~VIDCON0_ENVID_F;
+	}
+
+	writel(vidcon0, sfb->regs + VIDCON0);
+}
+
+/**
+ * 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;
+
+	dev_dbg(sfb->dev, "blank mode %d\n", blank_mode);
+
+	wincon = readl(sfb->regs + WINCON(index));
+
+	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) */
+		writel(WINxMAP_MAP | WINxMAP_MAP_COLOUR(0x0),
+		       sfb->regs + WINxMAP(index));
+		break;
+
+	case FB_BLANK_UNBLANK:
+		writel(0x0, sfb->regs + WINxMAP(index));
+		wincon |= WINCONx_ENWIN;
+		sfb->enabled |= (1 << index);
+		break;
+
+	case FB_BLANK_VSYNC_SUSPEND:
+	case FB_BLANK_HSYNC_SUSPEND:
+	default:
+		return 1;
+	}
+
+	writel(wincon, sfb->regs + WINCON(index));
+
+	/* 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.
+	 */
+
+	/* We could do something like the following code, but the current
+	 * system of using framebuffer events means that we cannot make
+	 * the distinction between just window 0 being inactive and all
+	 * the windows being down.
+	 *
+	 * s3c_fb_enable(sfb, sfb->enabled ? 1 : 0);
+	*/
+
+	/* we're stuck with this until we can do something about overriding
+	 * the power control using the blanking event for a single fb.
+	 */
+	if (index == 0)
+		s3c_fb_enable(sfb, blank_mode != FB_BLANK_POWERDOWN ? 1 : 0);
+
+	return 0;
+}
+
+static struct fb_ops s3c_fb_ops = {
+	.owner		= THIS_MODULE,
+	.fb_check_var	= s3c_fb_check_var,
+	.fb_set_par	= s3c_fb_set_par,
+	.fb_blank	= s3c_fb_blank,
+	.fb_setcolreg	= s3c_fb_setcolreg,
+	.fb_fillrect	= cfb_fillrect,
+	.fb_copyarea	= cfb_copyarea,
+	.fb_imageblit	= cfb_imageblit,
+};
+
+/**
+ * s3c_fb_alloc_memory() - allocate display memory for framebuffer window
+ * @sfb: The base resources for the hardware.
+ * @win: The window to initialise memory for.
+ *
+ * Allocate memory for the given framebuffer.
+ */
+static int __devinit s3c_fb_alloc_memory(struct s3c_fb *sfb,
+					 struct s3c_fb_win *win)
+{
+	struct s3c_fb_pd_win *windata = win->windata;
+	unsigned int real_size, virt_size, size;
+	struct fb_info *fbi = win->fbinfo;
+	dma_addr_t map_dma;
+
+	dev_dbg(sfb->dev, "allocating memory for display\n");
+
+	real_size = windata->win_mode.xres * windata->win_mode.yres;
+	virt_size = windata->virtual_x * windata->virtual_y;
+
+	dev_dbg(sfb->dev, "real_size=%u (%u.%u), virt_size=%u (%u.%u)\n",
+		real_size, windata->win_mode.xres, windata->win_mode.yres,
+		virt_size, windata->virtual_x, windata->virtual_y);
+
+	size = (real_size > virt_size) ? real_size : virt_size;
+	size *= (windata->max_bpp > 16) ? 32 : windata->max_bpp;
+	size /= 8;
+
+	fbi->fix.smem_len = size;
+	size = PAGE_ALIGN(size);
+
+	dev_dbg(sfb->dev, "want %u bytes for window\n", size);
+
+	fbi->screen_base = dma_alloc_writecombine(sfb->dev, size,
+						  &map_dma, GFP_KERNEL);
+	if (!fbi->screen_base)
+		return -ENOMEM;
+
+	dev_dbg(sfb->dev, "mapped %x to %p\n",
+		(unsigned int)map_dma, fbi->screen_base);
+
+	memset(fbi->screen_base, 0x0, size);
+	fbi->fix.smem_start = map_dma;
+
+	return 0;
+}
+
+/**
+ * s3c_fb_free_memory() - free the display memory for the given window
+ * @sfb: The base resources for the hardware.
+ * @win: The window to free the display memory for.
+ *
+ * Free the display memory allocated by s3c_fb_alloc_memory().
+ */
+static void s3c_fb_free_memory(struct s3c_fb *sfb, struct s3c_fb_win *win)
+{
+	struct fb_info *fbi = win->fbinfo;
+
+	dma_free_writecombine(sfb->dev, PAGE_ALIGN(fbi->fix.smem_len),
+			      fbi->screen_base, fbi->fix.smem_start);
+}
+
+/**
+ * s3c_fb_release_win() - release resources for a framebuffer window.
+ * @win: The window to cleanup the resources for.
+ *
+ * Release the resources that where claimed for the hardware window,
+ * such as the framebuffer instance and any memory claimed for it.
+ */
+static void s3c_fb_release_win(struct s3c_fb *sfb, struct s3c_fb_win *win)
+{
+	fb_dealloc_cmap(&win->fbinfo->cmap);
+	unregister_framebuffer(win->fbinfo);
+	s3c_fb_free_memory(sfb, win);
+}
+
+/**
+ * s3c_fb_probe_win() - register an hardware window
+ * @sfb: The base resources for the hardware
+ * @res: Pointer to where to place the resultant window.
+ *
+ * Allocate and do the basic initialisation for one of the hardware's graphics
+ * windows.
+ */
+static int __devinit s3c_fb_probe_win(struct s3c_fb *sfb, unsigned int win_no,
+				      struct s3c_fb_win **res)
+{
+	struct fb_var_screeninfo *var;
+	struct fb_videomode *initmode;
+	struct s3c_fb_pd_win *windata;
+	struct s3c_fb_win *win;
+	struct fb_info *fbinfo;
+	int palette_size;
+	int ret;
+
+	dev_dbg(sfb->dev, "probing window %d\n", win_no);
+
+	palette_size = s3c_fb_win_pal_size(win_no);
+
+	fbinfo = framebuffer_alloc(sizeof(struct s3c_fb_win) +
+				   palette_size * sizeof(u32), sfb->dev);
+	if (!fbinfo) {
+		dev_err(sfb->dev, "failed to allocate framebuffer\n");
+		return -ENOENT;
+	}
+
+	windata = sfb->pdata->win[win_no];
+	initmode = &windata->win_mode;
+
+	WARN_ON(windata->max_bpp == 0);
+	WARN_ON(windata->win_mode.xres == 0);
+	WARN_ON(windata->win_mode.yres == 0);
+
+	win = fbinfo->par;
+	var = &fbinfo->var;
+	win->fbinfo = fbinfo;
+	win->parent = sfb;
+	win->windata = windata;
+	win->index = win_no;
+	win->palette_buffer = (u32 *)(win + 1);
+
+	ret = s3c_fb_alloc_memory(sfb, win);
+	if (ret) {
+		dev_err(sfb->dev, "failed to allocate display memory\n");
+		goto err_framebuffer;
+	}
+
+	/* setup the r/b/g positions for the window's palette */
+	s3c_fb_init_palette(win_no, &win->palette);
+
+	/* setup the initial video mode from the window */
+	fb_videomode_to_var(&fbinfo->var, initmode);
+
+	fbinfo->fix.type	= FB_TYPE_PACKED_PIXELS;
+	fbinfo->fix.accel	= FB_ACCEL_NONE;
+	fbinfo->var.activate	= FB_ACTIVATE_NOW;
+	fbinfo->var.vmode	= FB_VMODE_NONINTERLACED;
+	fbinfo->var.bits_per_pixel = windata->default_bpp;
+	fbinfo->fbops		= &s3c_fb_ops;
+	fbinfo->flags		= FBINFO_FLAG_DEFAULT;
+	fbinfo->pseudo_palette  = &win->pseudo_palette;
+
+	/* prepare to actually start the framebuffer */
+
+	ret = s3c_fb_check_var(&fbinfo->var, fbinfo);
+	if (ret < 0) {
+		dev_err(sfb->dev, "check_var failed on initial video params\n");
+		goto err_alloc_mem;
+	}
+
+	/* create initial colour map */
+
+	ret = fb_alloc_cmap(&fbinfo->cmap, s3c_fb_win_pal_size(win_no), 1);
+	if (ret == 0)
+		fb_set_cmap(&fbinfo->cmap, fbinfo);
+	else
+		dev_err(sfb->dev, "failed to allocate fb cmap\n");
+
+	s3c_fb_set_par(fbinfo);
+
+	dev_dbg(sfb->dev, "about to register framebuffer\n");
+
+	/* run the check_var and set_par on our configuration. */
+
+	ret = register_framebuffer(fbinfo);
+	if (ret < 0) {
+		dev_err(sfb->dev, "failed to register framebuffer\n");
+		goto err_alloc_mem;
+	}
+
+	*res = win;
+	dev_info(sfb->dev, "window %d: fb %s\n", win_no, fbinfo->fix.id);
+
+	return 0;
+
+err_alloc_mem:
+	s3c_fb_free_memory(sfb, win);
+
+err_framebuffer:
+	unregister_framebuffer(fbinfo);
+	return ret;
+}
+
+/**
+ * s3c_fb_clear_win() - clear hardware window registers.
+ * @sfb: The base resources for the hardware.
+ * @win: The window to process.
+ *
+ * Reset the specific window registers to a known state.
+ */
+static void s3c_fb_clear_win(struct s3c_fb *sfb, int win)
+{
+	void __iomem *regs = sfb->regs;
+
+	writel(0, regs + WINCON(win));
+	writel(0xffffff, regs + WxKEYCONy(win, 0));
+	writel(0xffffff, regs + WxKEYCONy(win, 1));
+
+	writel(0, regs + VIDOSD_A(win));
+	writel(0, regs + VIDOSD_B(win));
+	writel(0, regs + VIDOSD_C(win));
+}
+
+static int __devinit s3c_fb_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct s3c_fb_platdata *pd;
+	struct s3c_fb *sfb;
+	struct resource *res;
+	int win;
+	int ret = 0;
+
+	pd = pdev->dev.platform_data;
+	if (!pd) {
+		dev_err(dev, "no platform data specified\n");
+		return -EINVAL;
+	}
+
+	sfb = kzalloc(sizeof(struct s3c_fb), GFP_KERNEL);
+	if (!sfb) {
+		dev_err(dev, "no memory for framebuffers\n");
+		return -ENOMEM;
+	}
+
+	sfb->dev = dev;
+	sfb->pdata = pd;
+
+	sfb->bus_clk = clk_get(dev, "lcd");
+	if (IS_ERR(sfb->bus_clk)) {
+		dev_err(dev, "failed to get bus clock\n");
+		goto err_sfb;
+	}
+
+	clk_enable(sfb->bus_clk);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(dev, "failed to find registers\n");
+		ret = -ENOENT;
+		goto err_clk;
+	}
+
+	sfb->regs_res = request_mem_region(res->start, resource_size(res),
+					   dev_name(dev));
+	if (!sfb->regs_res) {
+		dev_err(dev, "failed to claim register region\n");
+		ret = -ENOENT;
+		goto err_clk;
+	}
+
+	sfb->regs = ioremap(res->start, resource_size(res));
+	if (!sfb->regs) {
+		dev_err(dev, "failed to map registers\n");
+		ret = -ENXIO;
+		goto err_req_region;
+	}
+
+	dev_dbg(dev, "got resources (regs %p), probing windows\n", sfb->regs);
+
+	/* setup gpio and output polarity controls */
+
+	pd->setup_gpio();
+
+	writel(pd->vidcon1, sfb->regs + VIDCON1);
+
+	/* zero all windows before we do anything */
+
+	for (win = 0; win < S3C_FB_MAX_WIN; win++)
+		s3c_fb_clear_win(sfb, win);
+
+	/* we have the register setup, start allocating framebuffers */
+
+	for (win = 0; win < S3C_FB_MAX_WIN; win++) {
+		if (!pd->win[win])
+			continue;
+
+		ret = s3c_fb_probe_win(sfb, win, &sfb->windows[win]);
+		if (ret < 0) {
+			dev_err(dev, "failed to create window %d\n", win);
+			for (; win >= 0; win--)
+				s3c_fb_release_win(sfb, sfb->windows[win]);
+			goto err_ioremap;
+		}
+	}
+
+	platform_set_drvdata(pdev, sfb);
+
+	return 0;
+
+err_ioremap:
+	iounmap(sfb->regs);
+
+err_req_region:
+	release_resource(sfb->regs_res);
+	kfree(sfb->regs_res);
+
+err_clk:
+	clk_disable(sfb->bus_clk);
+	clk_put(sfb->bus_clk);
+
+err_sfb:
+	kfree(sfb);
+	return ret;
+}
+
+/**
+ * s3c_fb_remove() - Cleanup on module finalisation
+ * @pdev: The platform device we are bound to.
+ *
+ * Shutdown and then release all the resources that the driver allocated
+ * on initialisation.
+ */
+static int __devexit s3c_fb_remove(struct platform_device *pdev)
+{
+	struct s3c_fb *sfb = platform_get_drvdata(pdev);
+	int win;
+
+	for (win = 0; win <= S3C_FB_MAX_WIN; win++)
+		s3c_fb_release_win(sfb, sfb->windows[win]);
+
+	iounmap(sfb->regs);
+
+	clk_disable(sfb->bus_clk);
+	clk_put(sfb->bus_clk);
+
+	release_resource(sfb->regs_res);
+	kfree(sfb->regs_res);
+
+	kfree(sfb);
+
+	return 0;
+}
+
+#define s3c_fb_suspend NULL
+#define s3c_fb_resume  NULL
+
+static struct platform_driver s3c_fb_driver = {
+	.probe		= s3c_fb_probe,
+	.remove		= s3c_fb_remove,
+	.suspend	= s3c_fb_suspend,
+	.resume		= s3c_fb_resume,
+	.driver		= {
+		.name	= "s3c-fb",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init s3c_fb_init(void)
+{
+	return platform_driver_register(&s3c_fb_driver);
+}
+
+static void __exit s3c_fb_cleanup(void)
+{
+	platform_driver_unregister(&s3c_fb_driver);
+}
+
+module_init(s3c_fb_init);
+module_exit(s3c_fb_cleanup);
+
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_DESCRIPTION("Samsung S3C SoC Framebuffer driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:s3c-fb");