path: root/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 P�tzl <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 P�tzl <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/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/workqueue.h>
#include <linux/wait.h>
#include <linux/platform_device.h>
#include <linux/clk.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>

#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 fb_info *info)
{
	unsigned long saddr1, saddr2, saddr3;
	int line_length = info->var.xres * info->var.bits_per_pixel;

	saddr1  = info->fix.smem_start >> 1;
	saddr2  = info->fix.smem_start;
	saddr2 += (line_length * info->var.yres) / 8;
	saddr2 >>= 1;

	saddr3 = S3C2410_OFFSIZE(0) |
		 S3C2410_PAGEWIDTH((line_length / 16) & 0x3ff);

	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;
	struct s3c2410fb_mach_info *mach_info = fbi->mach_info;
	struct s3c2410fb_display *display = NULL;
	unsigned i;

	dprintk("check_var(var=%p, info=%p)\n", var, info);

	/* validate x/y resolution */

	for (i = 0; i < mach_info->num_displays; i++)
		if (var->yres == mach_info->disp