path: root/drivers/video/s3c2410fb.c

/* 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.
*/

#include <linux/module.h>
#include <linux/kernel.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 <asm/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	= 0;
#endif

#define dprintk(msg...)	if (debug) { printk(KERN_DEBUG "s3c2410fb: " msg); }

/* 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 = clk_get_rate(fbi->clk);
	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 = fbi->dev->platform_data;
	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-><