Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1144 insertions, 0 deletions

diff --git a/drivers/video/fbdev/s3c2410fb.c b/drivers/video/fbdev/s3c2410fb.c
new file mode 100644
index 000000000..a67e4567e
--- /dev/null
+++ b/drivers/video/fbdev/s3c2410fb.c
@@ -0,0 +1,1144 @@
+/* linux/drivers/video/s3c2410fb.c
+ *	Copyright (c) 2004,2005 Arnaud Patard
+ *	Copyright (c) 2004-2008 Ben Dooks
+ *
+ * S3C2410 LCD Framebuffer Driver
+ *
+ * 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.
+ *
+ * Driver based on skeletonfb.c, sa1100fb.c and others.
+*/
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/cpufreq.h>
+#include <linux/io.h>
+
+#include <asm/div64.h>
+
+#include <asm/mach/map.h>
+#include <mach/regs-lcd.h>
+#include <mach/regs-gpio.h>
+#include <mach/fb.h>
+
+#ifdef CONFIG_PM
+#include <linux/pm.h>
+#endif
+
+#include "s3c2410fb.h"
+
+/* Debugging stuff */
+#ifdef CONFIG_FB_S3C2410_DEBUG
+static int debug	= 1;
+#else
+static int debug;
+#endif
+
+#define dprintk(msg...) \
+do { \
+	if (debug) \
+		pr_debug(msg); \
+} while (0)
+
+/* useful functions */
+
+static int is_s3c2412(struct s3c2410fb_info *fbi)
+{
+	return (fbi->drv_type == DRV_S3C2412);
+}
+
+/* s3c2410fb_set_lcdaddr
+ *
+ * initialise lcd controller address pointers
+ */
+static void s3c2410fb_set_lcdaddr(struct fb_info *info)
+{
+	unsigned long saddr1, saddr2, saddr3;
+	struct s3c2410fb_info *fbi = info->par;
+	void __iomem *regs = fbi->io;
+
+	saddr1  = info->fix.smem_start >> 1;
+	saddr2  = info->fix.smem_start;
+	saddr2 += info->fix.line_length * info->var.yres;
+	saddr2 >>= 1;
+
+	saddr3 = S3C2410_OFFSIZE(0) |
+		 S3C2410_PAGEWIDTH((info->fix.line_length / 2) & 0x3ff);
+
+	dprintk("LCDSADDR1 = 0x%08lx\n", saddr1);
+	dprintk("LCDSADDR2 = 0x%08lx\n", saddr2);
+	dprintk("LCDSADDR3 = 0x%08lx\n", saddr3);
+
+	writel(saddr1, regs + S3C2410_LCDSADDR1);
+	writel(saddr2, regs + S3C2410_LCDSADDR2);
+	writel(saddr3, regs + S3C2410_LCDSADDR3);
+}
+
+/* s3c2410fb_calc_pixclk()
+ *
+ * calculate divisor for clk->pixclk
+ */
+static unsigned int s3c2410fb_calc_pixclk(struct s3c2410fb_info *fbi,
+					  unsigned long pixclk)
+{
+	unsigned long clk = fbi->clk_rate;
+	unsigned long long div;
+
+	/* pixclk is in picoseconds, our clock is in Hz
+	 *
+	 * Hz -> picoseconds is / 10^-12
+	 */
+
+	div = (unsigned long long)clk * pixclk;
+	div >>= 12;			/* div / 2^12 */
+	do_div(div, 625 * 625UL * 625); /* div / 5^12 */
+
+	dprintk("pixclk %ld, divisor is %ld\n", pixclk, (long)div);
+	return div;
+}
+
+/*
+ *	s3c2410fb_check_var():
+ *	Get the video params out of 'var'. If a value doesn't fit, round it up,
+ *	if it's too big, return -EINVAL.
+ *
+ */
+static int s3c2410fb_check_var(struct fb_var_screeninfo *var,
+			       struct fb_info *info)
+{
+	struct s3c2410fb_info *fbi = info->par;
+	struct s3c2410fb_mach_info *mach_info = dev_get_platdata(fbi->dev);
+	struct s3c2410fb_display *display = NULL;
+	struct s3c2410fb_display *default_display = mach_info->displays +
+						    mach_info->default_display;
+	int type = default_display->type;
+	unsigned i;
+
+	dprintk("check_var(var=%p, info=%p)\n", var, info);
+
+	/* validate x/y resolution */
+	/* choose default mode if possible */
+	if (var->yres == default_display->yres &&
+	    var->xres == default_display->xres &&
+	    var->bits_per_pixel == default_display->bpp)
+		display = default_display;
+	else
+		for (i = 0; i < mach_info->num_displays; i++)
+			if (type == mach_info->displays[i].type &&
+			    var->yres == mach_info->displays[i].yres &&
+			    var->xres == mach_info->displays[i].xres &&
+			    var->bits_per_pixel == mach_info->displays[i].bpp) {
+				display = mach_info->displays + i;
+				break;
+			}
+
+	if (!display) {
+		dprintk("wrong resolution or depth %dx%d at %d bpp\n",
+			var->xres, var->yres, var->bits_per_pixel);
+		return -EINVAL;
+	}
+
+	/* it is always the size as the display */
+	var->xres_virtual = display->xres;
+	var->yres_virtual = display->yres;
+	var->height = display->height;
+	var->width = display->width;
+
+	/* copy lcd settings */
+	var->pixclock = display->pixclock;
+	var->left_margin = display->left_margin;
+	var->right_margin = display->right_margin;
+	var->upper_margin = display->upper_margin;
+	var->lower_margin = display->lower_margin;
+	var->vsync_len = display->vsync_len;
+	var->hsync_len = display->hsync_len;
+
+	fbi->regs.lcdcon5 = display->lcdcon5;
+	/* set display type */
+	fbi->regs.lcdcon1 = display->type;
+
+	var->transp.offset = 0;
+	var->transp.length = 0;
+	/* set r/g/b positions */
+	switch (var->bits_per_pixel) {
+	case 1:
+	case 2:
+	case 4:
+		var->red.offset	= 0;
+		var->red.length	= var->bits_per_pixel;
+		var->green	= var->red;
+		var->blue	= var->red;
+		break;
+	case 8:
+		if (display->type != S3C2410_LCDCON1_TFT) {
+			/* 8 bpp 332 */
+			var->red.length		= 3;
+			var->red.offset		= 5;
+			var->green.length	= 3;
+			var->green.offset	= 2;
+			var->blue.length	= 2;
+			var->blue.offset	= 0;
+		} else {
+			var->red.offset		= 0;
+			var->red.length		= 8;
+			var->green		= var->red;
+			var->blue		= var->red;
+		}
+		break;
+	case 12:
+		/* 12 bpp 444 */
+		var->red.length		= 4;
+		var->red.offset		= 8;
+		var->green.length	= 4;
+		var->green.offset	= 4;
+		var->blue.length	= 4;
+		var->blue.offset	= 0;
+		break;
+
+	default:
+	case 16:
+		if (display->lcdcon5 & S3C2410_LCDCON5_FRM565) {
+			/* 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;
+		} else {
+			/* 16 bpp, 5551 format */
+			var->red.offset		= 11;
+			var->green.offset	= 6;
+			var->blue.offset	= 1;
+			var->red.length		= 5;
+			var->green.length	= 5;
+			var->blue.length	= 5;
+		}
+		break;
+	case 32:
+		/* 24 bpp 888 and 8 dummy */
+		var->red.length		= 8;
+		var->red.offset		= 16;
+		var->green.length	= 8;
+		var->green.offset	= 8;
+		var->blue.length	= 8;
+		var->blue.offset	= 0;
+		break;
+	}
+	return 0;
+}
+
+/* s3c2410fb_calculate_stn_lcd_regs
+ *
+ * calculate register values from var settings
+ */
+static void s3c2410fb_calculate_stn_lcd_regs(const struct fb_info *info,
+					     struct s3c2410fb_hw *regs)
+{
+	const struct s3c2410fb_info *fbi = info->par;
+	const struct fb_var_screeninfo *var = &info->var;
+	int type = regs->lcdcon1 & ~S3C2410_LCDCON1_TFT;
+	int hs = var->xres >> 2;
+	unsigned wdly = (var->left_margin >> 4) - 1;
+	unsigned wlh = (var->hsync_len >> 4) - 1;
+
+	if (type != S3C2410_LCDCON1_STN4)
+		hs >>= 1;
+
+	switch (var->bits_per_pixel) {
+	case 1:
+		regs->lcdcon1 |= S3C2410_LCDCON1_STN1BPP;
+		break;
+	case 2:
+		regs->lcdcon1 |= S3C2410_LCDCON1_STN2GREY;
+		break;
+	case 4:
+		regs->lcdcon1 |= S3C2410_LCDCON1_STN4GREY;
+		break;
+	case 8:
+		regs->lcdcon1 |= S3C2410_LCDCON1_STN8BPP;
+		hs *= 3;
+		break;
+	case 12:
+		regs->lcdcon1 |= S3C2410_LCDCON1_STN12BPP;
+		hs *= 3;
+		break;
+
+	default:
+		/* invalid pixel depth */
+		dev_err(fbi->dev, "invalid bpp %d\n",
+			var->bits_per_pixel);
+	}
+	/* update X/Y info */
+	dprintk("setting horz: lft=%d, rt=%d, sync=%d\n",
+		var->left_margin, var->right_margin, var->hsync_len);
+
+	regs->lcdcon2 = S3C2410_LCDCON2_LINEVAL(var->yres - 1);
+
+	if (wdly > 3)
+		wdly = 3;
+
+	if (wlh > 3)
+		wlh = 3;
+
+	regs->lcdcon3 =	S3C2410_LCDCON3_WDLY(wdly) |
+			S3C2410_LCDCON3_LINEBLANK(var->right_margin / 8) |
+			S3C2410_LCDCON3_HOZVAL(hs - 1);
+
+	regs->lcdcon4 = S3C2410_LCDCON4_WLH(wlh);
+}
+
+/* s3c2410fb_calculate_tft_lcd_regs
+ *
+ * calculate register values from var settings
+ */
+static void s3c2410fb_calculate_tft_lcd_regs(const struct fb_info *info,
+					     struct s3c2410fb_hw *regs)
+{
+	const struct s3c2410fb_info *fbi = info->par;
+	const struct fb_var_screeninfo *var = &info->var;
+
+	switch (var->bits_per_pixel) {
+	case 1:
+		regs->lcdcon1 |= S3C2410_LCDCON1_TFT1BPP;
+		break;
+	case 2:
+		regs->lcdcon1 |= S3C2410_LCDCON1_TFT2BPP;
+		break;
+	case 4:
+		regs->lcdcon1 |= S3C2410_LCDCON1_TFT4BPP;
+		break;
+	case 8:
+		regs->lcdcon1 |= S3C2410_LCDCON1_TFT8BPP;
+		regs->lcdcon5 |= S3C2410_LCDCON5_BSWP |
+				 S3C2410_LCDCON5_FRM565;
+		regs->lcdcon5 &= ~S3C2410_LCDCON5_HWSWP;
+		break;
+	case 16:
+		regs->lcdcon1 |= S3C2410_LCDCON1_TFT16BPP;
+		regs->lcdcon5 &= ~S3C2410_LCDCON5_BSWP;
+		regs->lcdcon5 |= S3C2410_LCDCON5_HWSWP;
+		break;
+	case 32:
+		regs->lcdcon1 |= S3C2410_LCDCON1_TFT24BPP;
+		regs->lcdcon5 &= ~(S3C2410_LCDCON5_BSWP |
+				   S3C2410_LCDCON5_HWSWP |
+				   S3C2410_LCDCON5_BPP24BL);
+		break;
+	default:
+		/* invalid pixel depth */
+		dev_err(fbi->dev, "invalid bpp %d\n",
+			var->bits_per_pixel);
+	}
+	/* update X/Y info */
+	dprintk("setting vert: up=%d, low=%d, sync=%d\n",
+		var->upper_margin, var->lower_margin, var->vsync_len);
+
+	dprintk("setting horz: lft=%d, rt=%d, sync=%d\n",
+		var->left_margin, var->right_margin, var->hsync_len);
+
+	regs->lcdcon2 = S3C2410_LCDCON2_LINEVAL(var->yres - 1) |
+			S3C2410_LCDCON2_VBPD(var->upper_margin - 1) |
+			S3C2410_LCDCON2_VFPD(var->lower_margin - 1) |
+			S3C2410_LCDCON2_VSPW(var->vsync_len - 1);
+
+	regs->lcdcon3 = S3C2410_LCDCON3_HBPD(var->right_margin - 1) |
+			S3C2410_LCDCON3_HFPD(var->left_margin - 1) |
+			S3C2410_LCDCON3_HOZVAL(var->xres - 1);
+
+	regs->lcdcon4 = S3C2410_LCDCON4_HSPW(var->hsync_len - 1);
+}
+
+/* s3c2410fb_activate_var
+ *
+ * activate (set) the controller from the given framebuffer
+ * information
+ */
+static void s3c2410fb_activate_var(struct fb_info *info)
+{
+	struct s3c2410fb_info *fbi = info->par;
+	void __iomem *regs = fbi->io;
+	int type = fbi->regs.lcdcon1 & S3C2410_LCDCON1_TFT;
+	struct fb_var_screeninfo *var = &info->var;
+	int clkdiv;
+
+	clkdiv = DIV_ROUND_UP(s3c2410fb_calc_pixclk(fbi, var->pixclock), 2);
+
+	dprintk("%s: var->xres  = %d\n", __func__, var->xres);
+	dprintk("%s: var->yres  = %d\n", __func__, var->yres);
+	dprintk("%s: var->bpp   = %d\n", __func__, var->bits_per_pixel);
+
+	if (type == S3C2410_LCDCON1_TFT) {
+		s3c2410fb_calculate_tft_lcd_regs(info, &fbi->regs);
+		--clkdiv;
+		if (clkdiv < 0)
+			clkdiv = 0;
+	} else {
+		s3c2410fb_calculate_stn_lcd_regs(info, &fbi->regs);
+		if (clkdiv < 2)
+			clkdiv = 2;
+	}
+
+	fbi->regs.lcdcon1 |=  S3C2410_LCDCON1_CLKVAL(clkdiv);
+
+	/* write new registers */
+
+	dprintk("new register set:\n");
+	dprintk("lcdcon[1] = 0x%08lx\n", fbi->regs.lcdcon1);
+	dprintk("lcdcon[2] = 0x%08lx\n", fbi->regs.lcdcon2);
+	dprintk("lcdcon[3] = 0x%08lx\n", fbi->regs.lcdcon3);
+	dprintk("lcdcon[4] = 0x%08lx\n", fbi->regs.lcdcon4);
+	dprintk("lcdcon[5] = 0x%08lx\n", fbi->regs.lcdcon5);
+
+	writel(fbi->regs.lcdcon1 & ~S3C2410_LCDCON1_ENVID,
+		regs + S3C2410_LCDCON1);
+	writel(fbi->regs.lcdcon2, regs + S3C2410_LCDCON2);
+	writel(fbi->regs.lcdcon3, regs + S3C2410_LCDCON3);
+	writel(fbi->regs.lcdcon4, regs + S3C2410_LCDCON4);
+	writel(fbi->regs.lcdcon5, regs + S3C2410_LCDCON5);
+
+	/* set lcd address pointers */
+	s3c2410fb_set_lcdaddr(info);
+
+	fbi->regs.lcdcon1 |= S3C2410_LCDCON1_ENVID,
+	writel(fbi->regs.lcdcon1, regs + S3C2410_LCDCON1);
+}
+
+/*
+ *      s3c2410fb_set_par - Alters the hardware state.
+ *      @info: frame buffer structure that represents a single frame buffer
+ *
+ */
+static int s3c2410fb_set_par(struct fb_info *info)
+{
+	struct fb_var_screeninfo *var = &info->var;
+
+	switch (var->bits_per_pixel) {
+	case 32:
+	case 16:
+	case 12:
+		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;
+
+	/* activate this new configuration */
+
+	s3c2410fb_activate_var(info);
+	return 0;
+}
+
+static void schedule_palette_update(struct s3c2410fb_info *fbi,
+				    unsigned int regno, unsigned int val)
+{
+	unsigned long flags;
+	unsigned long irqen;
+	void __iomem *irq_base = fbi->irq_base;
+
+	local_irq_save(flags);
+
+	fbi->palette_buffer[regno] = val;
+
+	if (!fbi->palette_ready) {
+		fbi->palette_ready = 1;
+
+		/* enable IRQ */
+		irqen = readl(irq_base + S3C24XX_LCDINTMSK);
+		irqen &= ~S3C2410_LCDINT_FRSYNC;
+		writel(irqen, irq_base + S3C24XX_LCDINTMSK);
+	}
+
+	local_irq_restore(flags);
+}
+
+/* from pxafb.c */
+static inline unsigned int chan_to_field(unsigned int chan,
+					 struct fb_bitfield *bf)
+{
+	chan &= 0xffff;
+	chan >>= 16 - bf->length;
+	return chan << bf->offset;
+}
+
+static int s3c2410fb_setcolreg(unsigned regno,
+			       unsigned red, unsigned green, unsigned blue,
+			       unsigned transp, struct fb_info *info)
+{
+	struct s3c2410fb_info *fbi = info->par;
+	void __iomem *regs = fbi->io;
+	unsigned int val;
+
+	/* dprintk("setcol: regno=%d, rgb=%d,%d,%d\n",
+		   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 < 256) {
+			/* currently assume RGB 5-6-5 mode */
+
+			val  = (red   >>  0) & 0xf800;
+			val |= (green >>  5) & 0x07e0;
+			val |= (blue  >> 11) & 0x001f;
+
+			writel(val, regs + S3C2410_TFTPAL(regno));
+			schedule_palette_update(fbi, regno, val);
+		}
+
+		break;
+
+	default:
+		return 1;	/* unknown type */
+	}
+
+	return 0;
+}
+
+/* s3c2410fb_lcd_enable
+ *
+ * shutdown the lcd controller
+ */
+static void s3c2410fb_lcd_enable(struct s3c2410fb_info *fbi, int enable)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	if (enable)
+		fbi->regs.lcdcon1 |= S3C2410_LCDCON1_ENVID;
+	else
+		fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_ENVID;
+
+	writel(fbi->regs.lcdcon1, fbi->io + S3C2410_LCDCON1);
+
+	local_irq_restore(flags);
+}
+
+
+/*
+ *      s3c2410fb_blank
+ *	@blank_mode: the blank mode we want.
+ *	@info: frame buffer structure that represents a single frame buffer
+ *
+ *	Blank the screen if blank_mode != 0, else unblank. Return 0 if
+ *	blanking succeeded, != 0 if un-/blanking failed due to e.g. a
+ *	video mode which doesn't support it. Implements VESA suspend
+ *	and powerdown modes on hardware that supports disabling hsync/vsync:
+ *
+ *	Returns negative errno on error, or zero on success.
+ *
+ */
+static int s3c2410fb_blank(int blank_mode, struct fb_info *info)
+{
+	struct s3c2410fb_info *fbi = info->par;
+	void __iomem *tpal_reg = fbi->io;
+
+	dprintk("blank(mode=%d, info=%p)\n", blank_mode, info);
+
+	tpal_reg += is_s3c2412(fbi) ? S3C2412_TPAL : S3C2410_TPAL;
+
+	if (blank_mode == FB_BLANK_POWERDOWN)
+		s3c2410fb_lcd_enable(fbi, 0);
+	else
+		s3c2410fb_lcd_enable(fbi, 1);
+
+	if (blank_mode == FB_BLANK_UNBLANK)
+		writel(0x0, tpal_reg);
+	else {
+		dprintk("setting TPAL to output 0x000000\n");
+		writel(S3C2410_TPAL_EN, tpal_reg);
+	}
+
+	return 0;
+}
+
+static int s3c2410fb_debug_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%s\n", debug ? "on" : "off");
+}
+
+static int s3c2410fb_debug_store(struct device *dev,
+				 struct device_attribute *attr,
+				 const char *buf, size_t len)
+{
+	if (len < 1)
+		return -EINVAL;
+
+	if (strncasecmp(buf, "on", 2) == 0 ||
+	    strncasecmp(buf, "1", 1) == 0) {
+		debug = 1;
+		dev_dbg(dev, "s3c2410fb: Debug On");
+	} else if (strncasecmp(buf, "off", 3) == 0 ||
+		   strncasecmp(buf, "0", 1) == 0) {
+		debug = 0;
+		dev_dbg(dev, "s3c2410fb: Debug Off");
+	} else {
+		return -EINVAL;
+	}
+
+	return len;
+}
+
+static DEVICE_ATTR(debug, 0664, s3c2410fb_debug_show, s3c2410fb_debug_store);
+
+static struct fb_ops s3c2410fb_ops = {
+	.owner		= THIS_MODULE,
+	.fb_check_var	= s3c2410fb_check_var,
+	.fb_set_par	= s3c2410fb_set_par,
+	.fb_blank	= s3c2410fb_blank,
+	.fb_setcolreg	= s3c2410fb_setcolreg,
+	.fb_fillrect	= cfb_fillrect,
+	.fb_copyarea	= cfb_copyarea,
+	.fb_imageblit	= cfb_imageblit,
+};
+
+/*
+ * s3c2410fb_map_video_memory():
+ *	Allocates the DRAM memory for the frame buffer.  This buffer is
+ *	remapped into a non-cached, non-buffered, memory region to
+ *	allow palette and pixel writes to occur without flushing the
+ *	cache.  Once this area is remapped, all virtual memory
+ *	access to the video memory should occur at the new region.
+ */
+static int s3c2410fb_map_video_memory(struct fb_info *info)
+{
+	struct s3c2410fb_info *fbi = info->par;
+	dma_addr_t map_dma;
+	unsigned map_size = PAGE_ALIGN(info->fix.smem_len);
+
+	dprintk("map_video_memory(fbi=%p) map_size %u\n", fbi, map_size);
+
+	info->screen_base = dma_alloc_wc(fbi->dev, map_size, &map_dma,
+					 GFP_KERNEL);
+
+	if (info->screen_base) {
+		/* prevent initial garbage on screen */
+		dprintk("map_video_memory: clear %p:%08x\n",
+			info->screen_base, map_size);
+		memset(info->screen_base, 0x00, map_size);
+
+		info->fix.smem_start = map_dma;
+
+		dprintk("map_video_memory: dma=%08lx cpu=%p size=%08x\n",
+			info->fix.smem_start, info->screen_base, map_size);
+	}
+
+	return info->screen_base ? 0 : -ENOMEM;
+}
+
+static inline void s3c2410fb_unmap_video_memory(struct fb_info *info)
+{
+	struct s3c2410fb_info *fbi = info->par;
+
+	dma_free_wc(fbi->dev, PAGE_ALIGN(info->fix.smem_len),
+		    info->screen_base, info->fix.smem_start);
+}
+
+static inline void modify_gpio(void __iomem *reg,
+			       unsigned long set, unsigned long mask)
+{
+	unsigned long tmp;
+
+	tmp = readl(reg) & ~mask;
+	writel(tmp | set, reg);
+}
+
+/*
+ * s3c2410fb_init_registers - Initialise all LCD-related registers
+ */
+static int s3c2410fb_init_registers(struct fb_info *info)
+{
+	struct s3c2410fb_info *fbi = info->par;
+	struct s3c2410fb_mach_info *mach_info = dev_get_platdata(fbi->dev);
+	unsigned long flags;
+	void __iomem *regs = fbi->io;
+	void __iomem *tpal;
+	void __iomem *lpcsel;
+
+	if (is_s3c2412(fbi)) {
+		tpal = regs + S3C2412_TPAL;
+		lpcsel = regs + S3C2412_TCONSEL;
+	} else {
+		tpal = regs + S3C2410_TPAL;
+		lpcsel = regs + S3C2410_LPCSEL;
+	}
+
+	/* Initialise LCD with values from haret */
+
+	local_irq_save(flags);
+
+	/* modify the gpio(s) with interrupts set (bjd) */
+
+	modify_gpio(S3C2410_GPCUP,  mach_info->gpcup,  mach_info->gpcup_mask);
+	modify_gpio(S3C2410_GPCCON, mach_info->gpccon, mach_info->gpccon_mask);
+	modify_gpio(S3C2410_GPDUP,  mach_info->gpdup,  mach_info->gpdup_mask);
+	modify_gpio(S3C2410_GPDCON, mach_info->gpdcon, mach_info->gpdcon_mask);
+
+	local_irq_restore(flags);
+
+	dprintk("LPCSEL    = 0x%08lx\n", mach_info->lpcsel);
+	writel(mach_info->lpcsel, lpcsel);
+
+	dprintk("replacing TPAL %08x\n", readl(tpal));
+
+	/* ensure temporary palette disabled */
+	writel(0x00, tpal);
+
+	return 0;
+}
+
+static void s3c2410fb_write_palette(struct s3c2410fb_info *fbi)
+{
+	unsigned int i;
+	void __iomem *regs = fbi->io;
+
+	fbi->palette_ready = 0;
+
+	for (i = 0; i < 256; i++) {
+		unsigned long ent = fbi->palette_buffer[i];
+		if (ent == PALETTE_BUFF_CLEAR)
+			continue;
+
+		writel(ent, regs + S3C2410_TFTPAL(i));
+
+		/* it seems the only way to know exactly
+		 * if the palette wrote ok, is to check
+		 * to see if the value verifies ok
+		 */
+
+		if (readw(regs + S3C2410_TFTPAL(i)) == ent)
+			fbi->palette_buffer[i] = PALETTE_BUFF_CLEAR;
+		else
+			fbi->palette_ready = 1;   /* retry */
+	}
+}
+
+static irqreturn_t s3c2410fb_irq(int irq, void *dev_id)
+{
+	struct s3c2410fb_info *fbi = dev_id;
+	void __iomem *irq_base = fbi->irq_base;
+	unsigned long lcdirq = readl(irq_base + S3C24XX_LCDINTPND);
+
+	if (lcdirq & S3C2410_LCDINT_FRSYNC) {
+		if (fbi->palette_ready)
+			s3c2410fb_write_palette(fbi);
+
+		writel(S3C2410_LCDINT_FRSYNC, irq_base + S3C24XX_LCDINTPND);
+		writel(S3C2410_LCDINT_FRSYNC, irq_base + S3C24XX_LCDSRCPND);
+	}
+
+	return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_ARM_S3C24XX_CPUFREQ
+
+static int s3c2410fb_cpufreq_transition(struct notifier_block *nb,
+					unsigned long val, void *data)
+{
+	struct s3c2410fb_info *info;
+	struct fb_info *fbinfo;
+	long delta_f;
+
+	info = container_of(nb, struct s3c2410fb_info, freq_transition);
+	fbinfo = platform_get_drvdata(to_platform_device(info->dev));
+
+	/* work out change, <0 for speed-up */
+	delta_f = info->clk_rate - clk_get_rate(info->clk);
+
+	if ((val == CPUFREQ_POSTCHANGE && delta_f > 0) ||
+	    (val == CPUFREQ_PRECHANGE && delta_f < 0)) {
+		info->clk_rate = clk_get_rate(info->clk);
+		s3c2410fb_activate_var(fbinfo);
+	}
+
+	return 0;
+}
+
+static inline int s3c2410fb_cpufreq_register(struct s3c2410fb_info *info)
+{
+	info->freq_transition.notifier_call = s3c2410fb_cpufreq_transition;
+
+	return cpufreq_register_notifier(&info->freq_transition,
+					 CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+static inline void s3c2410fb_cpufreq_deregister(struct s3c2410fb_info *info)
+{
+	cpufreq_unregister_notifier(&info->freq_transition,
+				    CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+#else
+static inline int s3c2410fb_cpufreq_register(struct s3c2410fb_info *info)
+{
+	return 0;
+}
+
+static inline void s3c2410fb_cpufreq_deregister(struct s3c2410fb_info *info)
+{
+}
+#endif
+
+
+static const char driver_name[] = "s3c2410fb";
+
+static int s3c24xxfb_probe(struct platform_device *pdev,
+			   enum s3c_drv_type drv_type)
+{
+	struct s3c2410fb_info *info;
+	struct s3c2410fb_display *display;
+	struct fb_info *fbinfo;
+	struct s3c2410fb_mach_info *mach_info;
+	struct resource *res;
+	int ret;
+	int irq;
+	int i;
+	int size;
+	u32 lcdcon1;
+
+	mach_info = dev_get_platdata(&pdev->dev);
+	if (mach_info == NULL) {
+		dev_err(&pdev->dev,
+			"no platform data for lcd, cannot attach\n");
+		return -EINVAL;
+	}
+
+	if (mach_info->default_display >= mach_info->num_displays) {
+		dev_err(&pdev->dev, "default is %d but only %d displays\n",
+			mach_info->default_display, mach_info->num_displays);
+		return -EINVAL;
+	}
+
+	display = mach_info->displays + mach_info->default_display;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(&pdev->dev, "no irq for device\n");
+		return -ENOENT;
+	}
+
+	fbinfo = framebuffer_alloc(sizeof(struct s3c2410fb_info), &pdev->dev);
+	if (!fbinfo)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, fbinfo);
+
+	info = fbinfo->par;
+	info->dev = &pdev->dev;
+	info->drv_type = drv_type;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (res == NULL) {
+		dev_err(&pdev->dev, "failed to get memory registers\n");
+		ret = -ENXIO;
+		goto dealloc_fb;
+	}
+
+	size = resource_size(res);
+	info->mem = request_mem_region(res->start, size, pdev->name);
+	if (info->mem == NULL) {
+		dev_err(&pdev->dev, "failed to get memory region\n");
+		ret = -ENOENT;
+		goto dealloc_fb;
+	}
+
+	info->io = ioremap(res->start, size);
+	if (info->io == NULL) {
+		dev_err(&pdev->dev, "ioremap() of registers failed\n");
+		ret = -ENXIO;
+		goto release_mem;
+	}
+
+	if (drv_type == DRV_S3C2412)
+		info->irq_base = info->io + S3C2412_LCDINTBASE;
+	else
+		info->irq_base = info->io + S3C2410_LCDINTBASE;
+
+	dprintk("devinit\n");
+
+	strcpy(fbinfo->fix.id, driver_name);
+
+	/* Stop the video */
+	lcdcon1 = readl(info->io + S3C2410_LCDCON1);
+	writel(lcdcon1 & ~S3C2410_LCDCON1_ENVID, info->io + S3C2410_LCDCON1);
+
+	fbinfo->fix.type	    = FB_TYPE_PACKED_PIXELS;
+	fbinfo->fix.type_aux	    = 0;
+	fbinfo->fix.xpanstep	    = 0;
+	fbinfo->fix.ypanstep	    = 0;
+	fbinfo->fix.ywrapstep	    = 0;
+	fbinfo->fix.accel	    = FB_ACCEL_NONE;
+
+	fbinfo->var.nonstd	    = 0;
+	fbinfo->var.activate	    = FB_ACTIVATE_NOW;
+	fbinfo->var.accel_flags     = 0;
+	fbinfo->var.vmode	    = FB_VMODE_NONINTERLACED;
+
+	fbinfo->fbops		    = &s3c2410fb_ops;
+	fbinfo->flags		    = FBINFO_FLAG_DEFAULT;
+	fbinfo->pseudo_palette      = &info->pseudo_pal;
+
+	for (i = 0; i < 256; i++)
+		info->palette_buffer[i] = PALETTE_BUFF_CLEAR;
+
+	ret = request_irq(irq, s3c2410fb_irq, 0, pdev->name, info);
+	if (ret) {
+		dev_err(&pdev->dev, "cannot get irq %d - err %d\n", irq, ret);
+		ret = -EBUSY;
+		goto release_regs;
+	}
+
+	info->clk = clk_get(NULL, "lcd");
+	if (IS_ERR(info->clk)) {
+		dev_err(&pdev->dev, "failed to get lcd clock source\n");
+		ret = PTR_ERR(info->clk);
+		goto release_irq;
+	}
+
+	clk_prepare_enable(info->clk);
+	dprintk("got and enabled clock\n");
+
+	usleep_range(1000, 1100);
+
+	info->clk_rate = clk_get_rate(info->clk);
+
+	/* find maximum required memory size for display */
+	for (i = 0; i < mach_info->num_displays; i++) {
+		unsigned long smem_len = mach_info->displays[i].xres;
+
+		smem_len *= mach_info->displays[i].yres;
+		smem_len *= mach_info->displays[i].bpp;
+		smem_len >>= 3;
+		if (fbinfo->fix.smem_len < smem_len)
+			fbinfo->fix.smem_len = smem_len;
+	}
+
+	/* Initialize video memory */
+	ret = s3c2410fb_map_video_memory(fbinfo);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
+		ret = -ENOMEM;
+		goto release_clock;
+	}
+
+	dprintk("got video memory\n");
+
+	fbinfo->var.xres = display->xres;
+	fbinfo->var.yres = display->yres;
+	fbinfo->var.bits_per_pixel = display->bpp;
+
+	s3c2410fb_init_registers(fbinfo);
+
+	s3c2410fb_check_var(&fbinfo->var, fbinfo);
+
+	ret = s3c2410fb_cpufreq_register(info);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to register cpufreq\n");
+		goto free_video_memory;
+	}
+
+	ret = register_framebuffer(fbinfo);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to register framebuffer device: %d\n",
+			ret);
+		goto free_cpufreq;
+	}
+
+	/* create device files */
+	ret = device_create_file(&pdev->dev, &dev_attr_debug);
+	if (ret)
+		dev_err(&pdev->dev, "failed to add debug attribute\n");
+
+	dev_info(&pdev->dev, "fb%d: %s frame buffer device\n",
+		fbinfo->node, fbinfo->fix.id);
+
+	return 0;
+
+ free_cpufreq:
+	s3c2410fb_cpufreq_deregister(info);
+free_video_memory:
+	s3c2410fb_unmap_video_memory(fbinfo);
+release_clock:
+	clk_disable_unprepare(info->clk);
+	clk_put(info->clk);
+release_irq:
+	free_irq(irq, info);
+release_regs:
+	iounmap(info->io);
+release_mem:
+	release_mem_region(res->start, size);
+dealloc_fb:
+	framebuffer_release(fbinfo);
+	return ret;
+}
+
+static int s3c2410fb_probe(struct platform_device *pdev)
+{
+	return s3c24xxfb_probe(pdev, DRV_S3C2410);
+}
+
+static int s3c2412fb_probe(struct platform_device *pdev)
+{
+	return s3c24xxfb_probe(pdev, DRV_S3C2412);
+}
+
+
+/*
+ *  Cleanup
+ */
+static int s3c2410fb_remove(struct platform_device *pdev)
+{
+	struct fb_info *fbinfo = platform_get_drvdata(pdev);
+	struct s3c2410fb_info *info = fbinfo->par;
+	int irq;
+
+	unregister_framebuffer(fbinfo);
+	s3c2410fb_cpufreq_deregister(info);
+
+	s3c2410fb_lcd_enable(info, 0);
+	usleep_range(1000, 1100);
+
+	s3c2410fb_unmap_video_memory(fbinfo);
+
+	if (info->clk) {
+		clk_disable_unprepare(info->clk);
+		clk_put(info->clk);
+		info->clk = NULL;
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	free_irq(irq, info);
+
+	iounmap(info->io);
+
+	release_mem_region(info->mem->start, resource_size(info->mem));
+
+	framebuffer_release(fbinfo);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+
+/* suspend and resume support for the lcd controller */
+static int s3c2410fb_suspend(struct platform_device *dev, pm_message_t state)
+{
+	struct fb_info	   *fbinfo = platform_get_drvdata(dev);
+	struct s3c2410fb_info *info = fbinfo->par;
+
+	s3c2410fb_lcd_enable(info, 0);
+
+	/* sleep before disabling the clock, we need to ensure
+	 * the LCD DMA engine is not going to get back on the bus
+	 * before the clock goes off again (bjd) */
+
+	usleep_range(1000, 1100);
+	clk_disable_unprepare(info->clk);
+
+	return 0;
+}
+
+static int s3c2410fb_resume(struct platform_device *dev)
+{
+	struct fb_info	   *fbinfo = platform_get_drvdata(dev);
+	struct s3c2410fb_info *info = fbinfo->par;
+
+	clk_prepare_enable(info->clk);
+	usleep_range(1000, 1100);
+
+	s3c2410fb_init_registers(fbinfo);
+
+	/* re-activate our display after resume */
+	s3c2410fb_activate_var(fbinfo);
+	s3c2410fb_blank(FB_BLANK_UNBLANK, fbinfo);
+
+	return 0;
+}
+
+#else
+#define s3c2410fb_suspend NULL
+#define s3c2410fb_resume  NULL
+#endif
+
+static struct platform_driver s3c2410fb_driver = {
+	.probe		= s3c2410fb_probe,
+	.remove		= s3c2410fb_remove,
+	.suspend	= s3c2410fb_suspend,
+	.resume		= s3c2410fb_resume,
+	.driver		= {
+		.name	= "s3c2410-lcd",
+	},
+};
+
+static struct platform_driver s3c2412fb_driver = {
+	.probe		= s3c2412fb_probe,
+	.remove		= s3c2410fb_remove,
+	.suspend	= s3c2410fb_suspend,
+	.resume		= s3c2410fb_resume,
+	.driver		= {
+		.name	= "s3c2412-lcd",
+	},
+};
+
+int __init s3c2410fb_init(void)
+{
+	int ret = platform_driver_register(&s3c2410fb_driver);
+
+	if (ret == 0)
+		ret = platform_driver_register(&s3c2412fb_driver);
+
+	return ret;
+}
+
+static void __exit s3c2410fb_cleanup(void)
+{
+	platform_driver_unregister(&s3c2410fb_driver);
+	platform_driver_unregister(&s3c2412fb_driver);
+}
+
+module_init(s3c2410fb_init);
+module_exit(s3c2410fb_cleanup);
+
+MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
+MODULE_AUTHOR("Ben Dooks <ben-linux@fluff.org>");
+MODULE_DESCRIPTION("Framebuffer driver for the s3c2410");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:s3c2410-lcd");
+MODULE_ALIAS("platform:s3c2412-lcd");