/*
* 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/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/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 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 void 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_LCD
