[PATCH] s3c2410fb: ARM S3C2410 framebuffer driver

This set of two patches add support for the framebuffer of the Samsung S3C2410
ARM SoC.  This driver was started about one year ago and is now used on iPAQ
h1930/h1940, Acer n30 and probably other s3c2410-based machines I'm not aware
of.  I've also heard yesterday that it's working also on iPAQ rx3715/rx3115
(s3c2440-based machines).
Signed-Off-By: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Antonino Daplas <adaplas@pol.net>
Signed-off-by: Ben Dooks <ben@trinity.fluff.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/video/Kconfig

@@ -1516,6 +1516,30 @@ config FB_S1D13XXX
 	  working with S1D13806). Product specs at
 	  <http://www.erd.epson.com/vdc/html/legacy_13xxx.htm>
 
+config FB_S3C2410
+	tristate "S3C2410 LCD framebuffer support"
+	depends on FB && ARCH_S3C2410
+	select FB_CFB_FILLRECT
+	select FB_CFB_COPYAREA
+	select FB_CFB_IMAGEBLIT
+	select FB_SOFT_CURSOR
+	---help---
+	  Frame buffer driver for the built-in LCD controller in the Samsung
+	  S3C2410 processor.
+
+	  This driver is also available as a module ( = code which can be
+	  inserted and removed from the running kernel whenever you want). The
+	  module will be called s3c2410fb. If you want to compile it as a module,
+	  say M here and read <file:Documentation/modules.txt>.
+
+	  If unsure, say N.
+config FB_S3C2410_DEBUG
+	bool "S3C2410 lcd debug messages"
+	depends on FB_S3C2410
+	help
+	  Turn on debugging messages. Note that you can set/unset at run time
+	  through sysfs
+
 config FB_VIRTUAL
 	tristate "Virtual Frame Buffer support (ONLY FOR TESTING!)"
 	depends on FB

drivers/video/Makefile

@@ -94,6 +94,7 @@ obj-$(CONFIG_FB_MAXINE)		  += maxinefb.o
 obj-$(CONFIG_FB_TX3912)		  += tx3912fb.o
 obj-$(CONFIG_FB_S1D13XXX)	  += s1d13xxxfb.o
 obj-$(CONFIG_FB_IMX)              += imxfb.o
+obj-$(CONFIG_FB_S3C2410)	  += s3c2410fb.o
 
 # Platform or fallback drivers go here
 obj-$(CONFIG_FB_VESA)             += vesafb.o

drivers/video/s3c2410fb.c

+/*
+ * linux/drivers/video/s3c2410fb.c
+ *	Copyright (c) Arnaud Patard, Ben Dooks
+ *
+ * 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.
+ *
+ *	    S3C2410 LCD Controller Frame Buffer Driver
+ *	    based on skeletonfb.c, sa1100fb.c and others
+ *
+ * ChangeLog
+ * 2005-04-07: Arnaud Patard <arnaud.patard@rtp-net.org>
+ *      - u32 state -> pm_message_t state
+ *      - S3C2410_{VA,SZ}_LCD -> S3C24XX
+ *
+ * 2005-03-15: Arnaud Patard <arnaud.patard@rtp-net.org>
+ *      - Removed the ioctl
+ *      - use readl/writel instead of __raw_writel/__raw_readl
+ *
+ * 2004-12-04: Arnaud Patard <arnaud.patard@rtp-net.org>
+ *      - Added the possibility to set on or off the
+ *      debugging mesaages
+ *      - Replaced 0 and 1 by on or off when reading the
+ *      /sys files
+ *
+ * 2005-03-23: Ben Dooks <ben-linux@fluff.org>
+ *	- added non 16bpp modes
+ *	- updated platform information for range of x/y/bpp
+ *	- add code to ensure palette is written correctly
+ *	- add pixel clock divisor control
+ *
+ * 2004-11-11: Arnaud Patard <arnaud.patard@rtp-net.org>
+ * 	- Removed the use of currcon as it no more exist
+ * 	- Added LCD power sysfs interface
+ *
+ * 2004-11-03: Ben Dooks <ben-linux@fluff.org>
+ *	- minor cleanups
+ *	- add suspend/resume support
+ *	- s3c2410fb_setcolreg() not valid in >8bpp modes
+ *	- removed last CONFIG_FB_S3C2410_FIXED
+ *	- ensure lcd controller stopped before cleanup
+ *	- added sysfs interface for backlight power
+ *	- added mask for gpio configuration
+ *	- ensured IRQs disabled during GPIO configuration
+ *	- disable TPAL before enabling video
+ *
+ * 2004-09-20: Arnaud Patard <arnaud.patard@rtp-net.org>
+ *      - Suppress command line options
+ *
+ * 2004-09-15: Arnaud Patard <arnaud.patard@rtp-net.org>
+ * 	- code cleanup
+ *
+ * 2004-09-07: Arnaud Patard <arnaud.patard@rtp-net.org>
+ * 	- Renamed from h1940fb.c to s3c2410fb.c
+ * 	- Add support for different devices
+ * 	- Backlight support
+ *
+ * 2004-09-05: Herbert Ptzl <herbert@13thfloor.at>
+ *	- added clock (de-)allocation code
+ *	- added fixem fbmem option
+ *
+ * 2004-07-27: Arnaud Patard <arnaud.patard@rtp-net.org>
+ *	- code cleanup
+ *	- added a forgotten return in h1940fb_init
+ *
+ * 2004-07-19: Herbert Ptzl <herbert@13thfloor.at>
+ *	- code cleanup and extended debugging
+ *
+ * 2004-07-15: Arnaud Patard <arnaud.patard@rtp-net.org>
+ *	- First version
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/tty.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/dma-mapping.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/wait.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/div64.h>
+
+#include <asm/mach/map.h>
+#include <asm/arch/regs-lcd.h>
+#include <asm/arch/regs-gpio.h>
+#include <asm/arch/fb.h>
+#include <asm/hardware/clock.h>
+
+#ifdef CONFIG_PM
+#include <linux/pm.h>
+#endif
+
+#include "s3c2410fb.h"
+
+
+static struct s3c2410fb_mach_info *mach_info;
+
+/* Debugging stuff */
+#ifdef CONFIG_FB_S3C2410_DEBUG
+static int debug	   = 1;
+#else
+static int debug	   = 0;
+#endif
+
+#define dprintk(msg...)	if (debug) { printk(KERN_DEBUG "s3c2410fb: " msg); }
+
+/* useful functions */
+
+/* s3c2410fb_set_lcdaddr
+ *
+ * initialise lcd controller address pointers
+*/
+
+static void s3c2410fb_set_lcdaddr(struct s3c2410fb_info *fbi)
+{
+	struct fb_var_screeninfo *var = &fbi->fb->var;
+	unsigned long saddr1, saddr2, saddr3;
+
+	saddr1  = fbi->fb->fix.smem_start >> 1;
+	saddr2  = fbi->fb->fix.smem_start;
+	saddr2 += (var->xres * var->yres * var->bits_per_pixel)/8;
+	saddr2>>= 1;
+
+	saddr3 =  S3C2410_OFFSIZE(0) | S3C2410_PAGEWIDTH(var->xres);
+
+	dprintk("LCDSADDR1 = 0x%08lx\n", saddr1);
+	dprintk("LCDSADDR2 = 0x%08lx\n", saddr2);
+	dprintk("LCDSADDR3 = 0x%08lx\n", saddr3);
+
+	writel(saddr1, S3C2410_LCDSADDR1);
+	writel(saddr2, S3C2410_LCDSADDR2);
+	writel(saddr3, 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 = clk_get_rate(fbi->clk);
+	unsigned long long div;
+
+	/* pixclk is in picoseoncds, our clock is in Hz
+	 *
+	 * Hz -> picoseconds is / 10^-12
+	 */
+
+	div = (unsigned long long)clk * pixclk;
+	do_div(div,1000000UL);
+	do_div(div,1000000UL);
+
+	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;
+
+	dprintk("check_var(var=%p, info=%p)\n", var, info);
+
+	/* validate x/y resolution */
+
+	if (var->yres > fbi->mach_info->yres.max)
+		var->yres = fbi->mach_info->yres.max;
+	else if (var->yres < fbi->mach_info->yres.min)
+		var->yres = fbi->mach_info->yres.min;
+
+	if (var->xres > fbi->mach_info->xres.max)
+		var->yres = fbi->mach_info->xres.max;
+	else if (var->xres < fbi->mach_info->xres.min)
+		var->xres = fbi->mach_info->xres.min;
+
+	/* validate bpp */
+
+	if (var->bits_per_pixel > fbi->mach_info->bpp.max)
+		var->bits_per_pixel = fbi->mach_info->bpp.max;
+	else if (var->bits_per_pixel < fbi->mach_info->bpp.min)
+		var->bits_per_pixel = fbi->mach_info->bpp.min;
+
+	/* set r/g/b positions */
+
+	if (var->bits_per_pixel == 16) {
+		var->red.offset		= 11;
+		var->green.offset	= 5;
+		var->blue.offset	= 0;
+		var->red.length		= 5;
+		var->green.length	= 6;
+		var->blue.length	= 5;
+		var->transp.length	= 0;
+	} else {
+		var->red.length		= var->bits_per_pixel;
+		var->red.offset		= 0;
+		var->green.length	= var->bits_per_pixel;
+		var->green.offset	= 0;
+		var->blue.length	= var->bits_per_pixel;
+		var->blue.offset	= 0;
+		var->transp.length	= 0;
+	}
+
+	return 0;
+}
+
+/* s3c2410fb_activate_var
+ *
+ * activate (set) the controller from the given framebuffer
+ * information
+*/
+
+static int s3c2410fb_activate_var(struct s3c2410fb_info *fbi,
+				  struct fb_var_screeninfo *var)
+{
+	fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_MODEMASK;
+
+	dprintk("%s: var->xres  = %d\n", __FUNCTION__, var->xres);
+	dprintk("%s: var->yres  = %d\n", __FUNCTION__, var->yres);
+	dprintk("%s: var->bpp   = %d\n", __FUNCTION__, var->bits_per_pixel);
+
+	switch (var->bits_per_pixel) {
+	case 1:
+		fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT1BPP;
+		break;
+	case 2:
+		fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT2BPP;
+		break;
+	case 4:
+		fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT4BPP;
+		break;
+	case 8:
+		fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT8BPP;
+		break;
+	case 16:
+		fbi->regs.lcdcon1 |= S3C2410_LCDCON1_TFT16BPP;
+		break;
+	}
+
+	/* check to see if we need to update sync/borders */
+
+	if (!fbi->mach_info->fixed_syncs) {
+		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);
+
+		fbi->regs.lcdcon2 =
+			S3C2410_LCDCON2_VBPD(var->upper_margin - 1) |
+			S3C2410_LCDCON2_VFPD(var->lower_margin - 1) |
+			S3C2410_LCDCON2_VSPW(var->vsync_len - 1);
+
+		fbi->regs.lcdcon3 =
+			S3C2410_LCDCON3_HBPD(var->right_margin - 1) |
+			S3C2410_LCDCON3_HFPD(var->left_margin - 1);
+
+		fbi->regs.lcdcon4 &= ~S3C2410_LCDCON4_HSPW(0xff);
+		fbi->regs.lcdcon4 |=  S3C2410_LCDCON4_HSPW(var->hsync_len - 1);
+	}
+
+	/* update X/Y info */
+
+	fbi->regs.lcdcon2 &= ~S3C2410_LCDCON2_LINEVAL(0x3ff);
+	fbi->regs.lcdcon2 |=  S3C2410_LCDCON2_LINEVAL(var->yres - 1);
+
+	fbi->regs.lcdcon3 &= ~S3C2410_LCDCON3_HOZVAL(0x7ff);
+	fbi->regs.lcdcon3 |=  S3C2410_LCDCON3_HOZVAL(var->xres - 1);
+
+	if (var->pixclock > 0) {
+		int clkdiv = s3c2410fb_calc_pixclk(fbi, var->pixclock);
+
+		clkdiv = (clkdiv / 2) -1;
+		if (clkdiv < 0)
+			clkdiv = 0;
+
+		fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_CLKVAL(0x3ff);
+		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, S3C2410_LCDCON1);
+	writel(fbi->regs.lcdcon2, S3C2410_LCDCON2);
+	writel(fbi->regs.lcdcon3, S3C2410_LCDCON3);
+	writel(fbi->regs.lcdcon4, S3C2410_LCDCON4);
+	writel(fbi->regs.lcdcon5, S3C2410_LCDCON5);
+
+	/* set lcd address pointers */
+	s3c2410fb_set_lcdaddr(fbi);
+
+	writel(fbi->regs.lcdcon1, S3C2410_LCDCON1);
+}
+
+
+/*
+ *      s3c2410fb_set_par - Optional function. Alters the hardware state.
+ *      @info: frame buffer structure that represents a single frame buffer
+ *
+ */
+static int s3c2410fb_set_par(struct fb_info *info)
+{
+	struct s3c2410fb_info *fbi = info->par;
+	struct fb_var_screeninfo *var = &info->var;
+
+	if (var->bits_per_pixel == 16)
+		fbi->fb->fix.visual = FB_VISUAL_TRUECOLOR;
+	else
+		fbi->fb->fix.visual = FB_VISUAL_PSEUDOCOLOR;
+
+	fbi->fb->fix.line_length     = (var->width*var->bits_per_pixel)/8;
+
+	/* activate this new configuration */
+
+	s3c2410fb_activate_var(fbi, var);
+	return 0;
+}
+
+static void schedule_palette_update(struct s3c2410fb_info *fbi,
+				    unsigned int regno, unsigned int val)
+{
+	unsigned long flags;
+	unsigned long irqen;
+
+	local_irq_save(flags);
+
+	fbi->palette_buffer[regno] = val;
+
+	if (!fbi->palette_ready) {
+		fbi->palette_ready = 1;
+
+		/* enable IRQ */
+		irqen = readl(S3C2410_LCDINTMSK);
+		irqen &= ~S3C2410_LCDINT_FRSYNC;
+		writel(irqen, S3C2410_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;
+	unsigned int val;
+
+	/* dprintk("setcol: regno=%d, rgb=%d,%d,%d\n", regno, red, green, blue); */
+
+	switch (fbi->fb->fix.visual) {
+	case FB_VISUAL_TRUECOLOR:
+		/* true-colour, use pseuo-palette */
+
+		if (regno < 16) {
+			u32 *pal = fbi->fb->pseudo_palette;
+
+			val  = chan_to_field(red,   &fbi->fb->var.red);
+			val |= chan_to_field(green, &fbi->fb->var.green);
+			val |= chan_to_field(blue,  &fbi->fb->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, S3C2410_TFTPAL(regno));
+			schedule_palette_update(fbi, regno, val);
+		}
+
+		break;
+
+	default:
+		return 1;   /* unknown type */
+	}
+
+	return 0;
+}
+
+
+/**
+ *      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:
+ *	blank_mode == 2: suspend vsync
+ *	blank_mode == 3: suspend hsync
+ *	blank_mode == 4: powerdown
+ *
+ *	Returns negative errno on error, or zero on success.
+ *
+ */
+static int s3c2410fb_blank(int blank_mode, struct fb_info *info)
+{
+	dprintk("blank(mode=%d, info=%p)\n", blank_mode, info);
+
+	if (mach_info == NULL)
+		return -EINVAL;
+
+	if (blank_mode == FB_BLANK_UNBLANK)
+		writel(0x0, S3C2410_TPAL);
+	else {
+		dprintk("setting TPAL to output 0x000000\n");
+		writel(S3C2410_TPAL_EN, S3C2410_TPAL);
+	}
+
+	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 (mach_info == NULL)
+		return -EINVAL;
+
+	if (len < 1)
+		return -EINVAL;
+
+	if (strnicmp(buf, "on", 2) == 0 ||
+	    strnicmp(buf, "1", 1) == 0) {
+		debug = 1;
+		printk(KERN_DEBUG "s3c2410fb: Debug On");
+	} else if (strnicmp(buf, "off", 3) == 0 ||
+		   strnicmp(buf, "0", 1) == 0) {
+		debug = 0;
+		printk(KERN_DEBUG "s3c2410fb: Debug Off");
+	} else {
+		return -EINVAL;
+	}
+
+	return len;
+}
+
+
+static DEVICE_ATTR(debug, 0666,
+		   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,
+	.fb_cursor	= soft_cursor,
+};
+
+
+/*
+ * 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 __init s3c2410fb_map_video_memory(struct s3c2410fb_info *fbi)
+{
+	dprintk("map_video_memory(fbi=%p)\n", fbi);
+
+	fbi->map_size = PAGE_ALIGN(fbi->fb->fix.smem_len + PAGE_SIZE);
+	fbi->map_cpu  = dma_alloc_writecombine(fbi->dev, fbi->map_size,
+					       &fbi->map_dma, GFP_KERNEL);
+
+	fbi->map_size = fbi->fb->fix.smem_len;
+
+	if (fbi->map_cpu) {
+		/* prevent initial garbage on screen */
+		dprintk("map_video_memory: clear %p:%08x\n",
+			fbi->map_cpu, fbi->map_size);
+		memset(fbi->map_cpu, 0xf0, fbi->map_size);
+
+		fbi->screen_dma		= fbi->map_dma;
+		fbi->fb->screen_base	= fbi->map_cpu;
+		fbi->fb->fix.smem_start  = fbi->screen_dma;
+
+		dprintk("map_video_memory: dma=%08x cpu=%p size=%08x\n",
+			fbi->map_dma, fbi->map_cpu, fbi->fb->fix.smem_len);
+	}
+
+	return fbi->map_cpu ? 0 : -ENOMEM;
+}
+
+static inline void s3c2410fb_unmap_video_memory(struct s3c2410fb_info *fbi)
+{
+	dma_free_writecombine(fbi->dev,fbi->map_size,fbi->map_cpu, fbi->map_dma);
+}
+
+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
+ */
+
+int s3c2410fb_init_registers(struct s3c2410fb_info *fbi)
+{
+	unsigned long flags;
+
+	/* 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);
+
+	writel(fbi->regs.lcdcon1, S3C2410_LCDCON1);
+	writel(fbi->regs.lcdcon2, S3C2410_LCDCON2);
+	writel(fbi->regs.lcdcon3, S3C2410_LCDCON3);
+	writel(fbi->regs.lcdcon4, S3C2410_LCDCON4);
+	writel(fbi->regs.lcdcon5, S3C2410_LCDCON5);
+
+ 	s3c2410fb_set_lcdaddr(fbi);
+
+	dprintk("LPCSEL    = 0x%08lx\n", mach_info->lpcsel);
+	writel(mach_info->lpcsel, S3C2410_LPCSEL);
+
+	dprintk("replacing TPAL %08x\n", readl(S3C2410_TPAL));
+
+	/* ensure temporary palette disabled */
+	writel(0x00, S3C2410_TPAL);
+
+	/* Enable video by setting the ENVID bit to 1 */
+	fbi->regs.lcdcon1 |= S3C2410_LCDCON1_ENVID;
+	writel(fbi->regs.lcdcon1, S3C2410_LCDCON1);
+	return 0;
+}
+
+static void s3c2410fb_write_palette(struct s3c2410fb_info *fbi)
+{
+	unsigned int i;
+	unsigned long ent;
+
+	fbi->palette_ready = 0;
+
+	for (i = 0; i < 256; i++) {
+		if ((ent = fbi->palette_buffer[i]) == PALETTE_BUFF_CLEAR)
+			continue;
+
+		writel(ent, 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(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 pt_regs *r)
+{
+	struct s3c2410fb_info *fbi = dev_id;
+	unsigned long lcdirq = readl(S3C2410_LCDINTPND);
+
+	if (lcdirq & S3C2410_LCDINT_FRSYNC) {
+		if (fbi->palette_ready)
+			s3c2410fb_write_palette(fbi);
+
+		writel(S3C2410_LCDINT_FRSYNC, S3C2410_LCDINTPND);
+		writel(S3C2410_LCDINT_FRSYNC, S3C2410_LCDSRCPND);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static char driver_name[]="s3c2410fb";
+
+int __init s3c2410fb_probe(struct device *dev)
+{
+	struct s3c2410fb_info *info;
+	struct fb_info	   *fbinfo;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct s3c2410fb_hw *mregs;
+	int ret;
+	int irq;
+	int i;
+
+	mach_info = dev->platform_data;
+	if (mach_info == NULL) {
+		dev_err(dev,"no platform data for lcd, cannot attach\n");
+		return -EINVAL;
+	}
+
+	mregs = &mach_info->regs;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(dev, "no irq for device\n");
+		return -ENOENT;
+	}
+
+	fbinfo = framebuffer_alloc(sizeof(struct s3c2410fb_info), dev);
+	if (!fbinfo) {
+		return -ENOMEM;
+	}
+
+
+	info = fbinfo->par;
+	info->fb = fbinfo;
+	dev_set_drvdata(dev, fbinfo);
+
+	s3c2410fb_init_registers(info);
+
+	dprintk("devinit\n");
+
+	strcpy(fbinfo->fix.id, driver_name);
+
+	memcpy(&info->regs, &mach_info->regs, sizeof(info->regs));
+
+	info->mach_info		    = dev->platform_data;
+
+	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.height	    = mach_info->height;
+	fbinfo->var.width	    = mach_info->width;
+	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;
+
+	fbinfo->var.xres	    = mach_info->xres.defval;
+	fbinfo->var.xres_virtual    = mach_info->xres.defval;
+	fbinfo->var.yres	    = mach_info->yres.defval;
+	fbinfo->var.yres_virtual    = mach_info->yres.defval;
+	fbinfo->var.bits_per_pixel  = mach_info->bpp.defval;
+
+	fbinfo->var.upper_margin    = S3C2410_LCDCON2_GET_VBPD(mregs->lcdcon2) +1;
+	fbinfo->var.lower_margin    = S3C2410_LCDCON2_GET_VFPD(mregs->lcdcon2) +1;
+	fbinfo->var.vsync_len	    = S3C2410_LCDCON2_GET_VSPW(mregs->lcdcon2) + 1;
+
+	fbinfo->var.left_margin	    = S3C2410_LCDCON3_GET_HFPD(mregs->lcdcon3) + 1;
+	fbinfo->var.right_margin    = S3C2410_LCDCON3_GET_HBPD(mregs->lcdcon3) + 1;
+	fbinfo->var.hsync_len	    = S3C2410_LCDCON4_GET_HSPW(mregs->lcdcon4) + 1;
+
+	fbinfo->var.red.offset      = 11;
+	fbinfo->var.green.offset    = 5;
+	fbinfo->var.blue.offset     = 0;
+	fbinfo->var.transp.offset   = 0;
+	fbinfo->var.red.length      = 5;
+	fbinfo->var.green.length    = 6;
+	fbinfo->var.blue.length     = 5;
+	fbinfo->var.transp.length   = 0;
+	fbinfo->fix.smem_len        =	mach_info->xres.max *
+					mach_info->yres.max *
+					mach_info->bpp.max / 8;
+
+	for (i = 0; i < 256; i++)
+		info->palette_buffer[i] = PALETTE_BUFF_CLEAR;
+
+	if (!request_mem_region((unsigned long)S3C24XX_VA_LCD, SZ_1M, "s3c2410-lcd")) {
+		ret = -EBUSY;
+		goto dealloc_fb;
+	}
+
+
+	dprintk("got LCD region\n");
+
+	ret = request_irq(irq, s3c2410fb_irq, SA_INTERRUPT, pdev->name, info);
+	if (ret) {
+		dev_err(dev, "cannot get irq %d - err %d\n", irq, ret);
+		ret = -EBUSY;
+		goto release_mem;
+	}
+
+	info->clk = clk_get(NULL, "lcd");
+	if (!info->clk || IS_ERR(info->clk)) {
+		printk(KERN_ERR "failed to get lcd clock source\n");
+		ret = -ENOENT;
+		goto release_irq;
+	}
+
+	clk_use(info->clk);
+	clk_enable(info->clk);
+	dprintk("got and enabled clock\n");
+
+	msleep(1);
+
+	/* Initialize video memory */
+	ret = s3c2410fb_map_video_memory(info);
+	if (ret) {
+		printk( KERN_ERR "Failed to allocate video RAM: %d\n", ret);
+		ret = -ENOMEM;
+		goto release_clock;
+	}
+	dprintk("got video memory\n");
+
+	ret = s3c2410fb_init_registers(info);
+
+	ret = s3c2410fb_check_var(&fbinfo->var, fbinfo);
+
+	ret = register_framebuffer(fbinfo);
+	if (ret < 0) {
+		printk(KERN_ERR "Failed to register framebuffer device: %d\n", ret);
+		goto free_video_memory;
+	}
+
+	/* create device files */
+	device_create_file(dev, &dev_attr_debug);
+
+	printk(KERN_INFO "fb%d: %s frame buffer device\n",
+		fbinfo->node, fbinfo->fix.id);
+
+	return 0;
+
+free_video_memory:
+	s3c2410fb_unmap_video_memory(info);
+release_clock:
+	clk_disable(info->clk);
+	clk_unuse(info->clk);
+	clk_put(info->clk);
+release_irq:
+	free_irq(irq,info);
+release_mem:
+ 	release_mem_region((unsigned long)S3C24XX_VA_LCD, S3C24XX_SZ_LCD);
+dealloc_fb:
+	framebuffer_release(fbinfo);
+	return ret;
+}
+
+/* s3c2410fb_stop_lcd
+ *
+ * shutdown the lcd controller
+*/
+
+static void s3c2410fb_stop_lcd(void)
+{
+	unsigned long flags;
+	unsigned long tmp;
+
+	local_irq_save(flags);
+
+	tmp = readl(S3C2410_LCDCON1);
+	writel(tmp & ~S3C2410_LCDCON1_ENVID, S3C2410_LCDCON1);
+
+	local_irq_restore(flags);
+}
+
+/*
+ *  Cleanup
+ */
+static int s3c2410fb_remove(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct fb_info	   *fbinfo = dev_get_drvdata(dev);
+	struct s3c2410fb_info *info = fbinfo->par;
+	int irq;
+
+	s3c2410fb_stop_lcd();
+	msleep(1);
+
+	s3c2410fb_unmap_video_memory(info);
+
+ 	if (info->clk) {
+ 		clk_disable(info->clk);
+ 		clk_unuse(info->clk);
+ 		clk_put(info->clk);
+ 		info->clk = NULL;
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	free_irq(irq,info);
+	release_mem_region((unsigned long)S3C24XX_VA_LCD, S3C24XX_SZ_LCD);
+	unregister_framebuffer(fbinfo);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+
+/* suspend and resume support for the lcd controller */
+
+static int s3c2410fb_suspend(struct device *dev, pm_message_t state, u32 level)
+{
+	struct fb_info	   *fbinfo = dev_get_drvdata(dev);
+	struct s3c2410fb_info *info = fbinfo->par;
+
+	if (level == SUSPEND_DISABLE || level == SUSPEND_POWER_DOWN) {
+		s3c2410fb_stop_lcd();
+
+		/* 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) */
+
+		msleep(1);
+		clk_disable(info->clk);
+	}
+
+	return 0;
+}
+
+static int s3c2410fb_resume(struct device *dev, u32 level)
+{
+	struct fb_info	   *fbinfo = dev_get_drvdata(dev);
+	struct s3c2410fb_info *info = fbinfo->par;
+
+	if (level == RESUME_ENABLE) {
+		clk_enable(info->clk);
+		msleep(1);
+
+		s3c2410fb_init_registers(info);
+
+	}
+
+	return 0;
+}
+
+#else
+#define s3c2410fb_suspend NULL
+#define s3c2410fb_resume  NULL
+#endif
+
+static struct device_driver s3c2410fb_driver = {
+	.name		= "s3c2410-lcd",
+	.bus		= &platform_bus_type,
+	.probe		= s3c2410fb_probe,
+	.suspend	= s3c2410fb_suspend,
+	.resume		= s3c2410fb_resume,
+	.remove		= s3c2410fb_remove
+};
+
+int __devinit s3c2410fb_init(void)
+{
+	return driver_register(&s3c2410fb_driver);
+}
+
+static void __exit s3c2410fb_cleanup(void)
+{
+	driver_unregister(&s3c2410fb_driver);
+}
+
+
+module_init(s3c2410fb_init);
+module_exit(s3c2410fb_cleanup);
+
+MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>, Ben Dooks <ben-linux@fluff.org>");
+MODULE_DESCRIPTION("Framebuffer driver for the s3c2410");
+MODULE_LICENSE("GPL");

drivers/video/s3c2410fb.h

+/*
+ * linux/drivers/s3c2410fb.h
+ * Copyright (c) Arnaud Patard
+ *
+ * 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.
+ *
+ *	    S3C2410 LCD Controller Frame Buffer Driver
+ *	    based on skeletonfb.c, sa1100fb.h
+ *
+ * ChangeLog
+ *
+ * 2004-12-04: Arnaud Patard <arnaud.patard@rtp-net.org>
+ *      - Moved dprintk to s3c2410fb.c
+ *
+ * 2004-09-07: Arnaud Patard <arnaud.patard@rtp-net.org>
+ * 	- Renamed from h1940fb.h to s3c2410fb.h
+ * 	- Chenged h1940 to s3c2410
+ *
+ * 2004-07-15: Arnaud Patard <arnaud.patard@rtp-net.org>
+ *	- First version
+ */
+
+#ifndef __S3C2410FB_H
+#define __S3C2410FB_H
+
+struct s3c2410fb_info {
+	struct fb_info		*fb;
+	struct device		*dev;
+	struct clk		*clk;
+
+	struct s3c2410fb_mach_info *mach_info;
+
+	/* raw memory addresses */
+	dma_addr_t		map_dma;	/* physical */
+	u_char *		map_cpu;	/* virtual */
+	u_int			map_size;
+
+	struct s3c2410fb_hw	regs;
+
+	/* addresses of pieces placed in raw buffer */
+	u_char *		screen_cpu;	/* virtual address of buffer */
+	dma_addr_t		screen_dma;	/* physical address of buffer */
+	unsigned int		palette_ready;
+
+	/* keep these registers in case we need to re-write palette */
+	u32			palette_buffer[256];
+	u32			pseudo_pal[16];
+};
+
+#define PALETTE_BUFF_CLEAR (0x80000000)	/* entry is clear/invalid */
+
+int s3c2410fb_init(void);
+
+#endif

include/asm-arm/arch-s3c2410/fb.h

+/* linux/include/asm/arch-s3c2410/fb.h
+ *
+ * Copyright (c) 2004 Arnaud Patard <arnaud.patard@rtp-net.org>
+ *
+ * Inspired by pxafb.h
+ *
+ * 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.
+ *
+ *
+ *  Changelog:
+ *	07-Sep-2004	RTP	Created file
+ *	03-Nov-2004	BJD	Updated and minor cleanups
+ *	03-Aug-2005     RTP     Renamed to fb.h
+*/
+
+#ifndef __ASM_ARM_FB_H
+#define __ASM_ARM_FB_H
+
+#include <asm/arch/regs-lcd.h>
+
+struct s3c2410fb_val {
+	unsigned int	defval;
+	unsigned int	min;
+	unsigned int	max;
+};
+
+struct s3c2410fb_hw {
+	unsigned long	lcdcon1;
+	unsigned long	lcdcon2;
+	unsigned long	lcdcon3;
+	unsigned long	lcdcon4;
+	unsigned long	lcdcon5;
+};
+
+struct s3c2410fb_mach_info {
+	unsigned char	fixed_syncs;	/* do not update sync/border */
+
+	/* Screen size */
+	int		width;
+	int		height;
+
+	/* Screen info */
+	struct s3c2410fb_val xres;
+	struct s3c2410fb_val yres;
+	struct s3c2410fb_val bpp;
+
+	/* lcd configuration registers */
+	struct s3c2410fb_hw  regs;
+
+	/* GPIOs */
+
+	unsigned long	gpcup;
+	unsigned long	gpcup_mask;
+	unsigned long	gpccon;
+	unsigned long	gpccon_mask;
+	unsigned long	gpdup;
+	unsigned long	gpdup_mask;
+	unsigned long	gpdcon;
+	unsigned long	gpdcon_mask;
+
+	/* lpc3600 control register */
+	unsigned long	lpcsel;
+};
+
+void __init set_s3c2410fb_info(struct s3c2410fb_mach_info *hard_s3c2410fb_info);
+
+#endif /* __ASM_ARM_FB_H */

include/asm-arm/arch-s3c2410/regs-lcd.h

@@ -51,21 +51,32 @@
 
 #define S3C2410_LCDCON1_ENVID	   (1)
 
+#define S3C2410_LCDCON1_MODEMASK    0x1E
+
 #define S3C2410_LCDCON2_VBPD(x)	    ((x) << 24)
 #define S3C2410_LCDCON2_LINEVAL(x)  ((x) << 14)
 #define S3C2410_LCDCON2_VFPD(x)	    ((x) << 6)
 #define S3C2410_LCDCON2_VSPW(x)	    ((x) << 0)
 
+#define S3C2410_LCDCON2_GET_VBPD(x) ( ((x) >> 24) & 0xFF)
+#define S3C2410_LCDCON2_GET_VFPD(x) ( ((x) >>  6) & 0xFF)
+#define S3C2410_LCDCON2_GET_VSPW(x) ( ((x) >>  0) & 0x3F)
+
 #define S3C2410_LCDCON3_HBPD(x)	    ((x) << 19)
 #define S3C2410_LCDCON3_WDLY(x)	    ((x) << 19)
 #define S3C2410_LCDCON3_HOZVAL(x)   ((x) << 8)
 #define S3C2410_LCDCON3_HFPD(x)	    ((x) << 0)
 #define S3C2410_LCDCON3_LINEBLANK(x)((x) << 0)
 
+#define S3C2410_LCDCON3_GET_HBPD(x) ( ((x) >> 19) & 0x7F)
+#define S3C2410_LCDCON3_GET_HFPD(x) ( ((x) >>  0) & 0xFF)
+
 #define S3C2410_LCDCON4_MVAL(x)	    ((x) << 8)
 #define S3C2410_LCDCON4_HSPW(x)	    ((x) << 0)
 #define S3C2410_LCDCON4_WLH(x)	    ((x) << 0)
 
+#define S3C2410_LCDCON4_GET_HSPW(x) ( ((x) >>  0) & 0xFF)
+
 #define S3C2410_LCDCON5_BPP24BL	    (1<<12)
 #define S3C2410_LCDCON5_FRM565	    (1<<11)
 #define S3C2410_LCDCON5_INVVCLK	    (1<<10)
@@ -100,10 +111,16 @@
 #define S3C2410_DITHMODE   S3C2410_LCDREG(0x4C)
 #define S3C2410_TPAL	   S3C2410_LCDREG(0x50)
 
+#define S3C2410_TPAL_EN		(1<<24)
+
 /* interrupt info */
 #define S3C2410_LCDINTPND  S3C2410_LCDREG(0x54)
 #define S3C2410_LCDSRCPND  S3C2410_LCDREG(0x58)
 #define S3C2410_LCDINTMSK  S3C2410_LCDREG(0x5C)
+#define S3C2410_LCDINT_FIWSEL	(1<<2)
+#define	S3C2410_LCDINT_FRSYNC	(1<<1)
+#define S3C2410_LCDINT_FICNT	(1<<0)
+
 #define S3C2410_LPCSEL	   S3C2410_LCDREG(0x60)
 
 #define S3C2410_TFTPAL(x)  S3C2410_LCDREG((0x400 + (x)*4))