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linux/drivers/video/s3c2410fb.c
Arnaud Patard (Rtp 357b819dda [PATCH] s3c2410fb: Add support for STN displays 
This patch adds support for stn displays on the s3c2410 arm SoC.

The LCD type is choosen by a new field in the s3c2410fb_mach_info structure
and its value is the value of the PNRMODE bits.  This worth to be noted as
a value of 0 means that you configure a 4 bit dual scan stn display.

Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Ben Dooks <ben-linux@fluff.org>
Acked-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-08 08:29:05 -08:00

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/*
* 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 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 * var->bits_per_pixel / 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;
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 */
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;
var->transp.offset = 0;
var->transp.length = 0;
break;
case 8:
if ( fbi->mach_info->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;
var->transp.length = 0;
} else {
var->red.offset = 0;
var->red.length = var->bits_per_pixel;
var->green = var->red;
var->blue = var->red;
var->transp.offset = 0;
var->transp.length = 0;
}
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;
var->transp.length = 0;
break;
default:
case 16:
if (fbi->regs.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;
var->transp.length = 0;
} 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;
var->transp.length = 0;
}
break;
case 24:
/* 24 bpp 888 */
var->red.length = 8;
var->red.offset = 16;
var->green.length = 8;
var->green.offset = 8;
var->blue.length = 8;
var->blue.offset = 0;
var->transp.length = 0;
break;
}
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)
{
int hs;
fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_MODEMASK;
fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_TFT;
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);
fbi->regs.lcdcon1 |= fbi->mach_info->type;
if (fbi->mach_info->type == S3C2410_LCDCON1_TFT)
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;
default:
/* invalid pixel depth */
dev_err(fbi->dev, "invalid bpp %d\n", var->bits_per_pixel);
}
else
switch (var->bits_per_pixel) {
case 1:
fbi->regs.lcdcon1 |= S3C2410_LCDCON1_STN1BPP;
break;
case 2:
fbi->regs.lcdcon1 |= S3C2410_LCDCON1_STN2GREY;
break;
case 4:
fbi->regs.lcdcon1 |= S3C2410_LCDCON1_STN4GREY;
break;
case 8:
fbi->regs.lcdcon1 |= S3C2410_LCDCON1_STN8BPP;
break;
case 12:
fbi->regs.lcdcon1 |= S3C2410_LCDCON1_STN12BPP;
break;
default:
/* invalid pixel depth */
dev_err(fbi->dev, "invalid bpp %d\n", var->bits_per_pixel);
}
/* 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);
switch(fbi->mach_info->type) {
case S3C2410_LCDCON1_DSCAN4:
case S3C2410_LCDCON1_STN8:
hs = var->xres / 8;
break;
case S3C2410_LCDCON1_STN4:
hs = var->xres / 4;
break;
default:
case S3C2410_LCDCON1_TFT:
hs = var->xres;
break;
}
/* Special cases : STN color displays */
if ( ((fbi->regs.lcdcon1 & S3C2410_LCDCON1_MODEMASK) == S3C2410_LCDCON1_STN8BPP) \
|| ((fbi->regs.lcdcon1 & S3C2410_LCDCON1_MODEMASK) == S3C2410_LCDCON1_STN12BPP) ) {
hs = hs * 3;
}
fbi->regs.lcdcon3 &= ~S3C2410_LCDCON3_HOZVAL(0x7ff);
fbi->regs.lcdcon3 |= S3C2410_LCDCON3_HOZVAL(hs - 1);
if (var->pixclock > 0) {
int clkdiv = s3c2410fb_calc_pixclk(fbi, var->pixclock);
if (fbi->mach_info->type == S3C2410_LCDCON1_TFT) {
clkdiv = (clkdiv / 2) -1;
if (clkdiv < 0)
clkdiv = 0;
}
else {
clkdiv = (clkdiv / 2);
if (clkdiv < 2)
clkdiv = 2;
}
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;
switch (var->bits_per_pixel)
{
case 16:
fbi->fb->fix.visual = FB_VISUAL_TRUECOLOR;
break;
case 1:
fbi->fb->fix.visual = FB_VISUAL_MONO01;
break;
default:
fbi->fb->fix.visual = FB_VISUAL_PSEUDOCOLOR;
break;
}
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,
};
/*
* 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
*/
static 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 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";
static int __init s3c2410fb_probe(struct platform_device *pdev)
{
struct s3c2410fb_info *info;
struct fb_info *fbinfo;
struct s3c2410fb_hw *mregs;
int ret;
int irq;
int i;
u32 lcdcon1;
mach_info = pdev->dev.platform_data;
if (mach_info == NULL) {
dev_err(&pdev->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(&pdev->dev, "no irq for device\n");
return -ENOENT;
}
fbinfo = framebuffer_alloc(sizeof(struct s3c2410fb_info), &pdev->dev);
if (!fbinfo) {
return -ENOMEM;
}
info = fbinfo->par;
info->fb = fbinfo;
platform_set_drvdata(pdev, fbinfo);
dprintk("devinit\n");
strcpy(fbinfo->fix.id, driver_name);
memcpy(&info->regs, &mach_info->regs, sizeof(info->regs));
/* Stop the video and unset ENVID if set */
info->regs.lcdcon1 &= ~S3C2410_LCDCON1_ENVID;
lcdcon1 = readl(S3C2410_LCDCON1);
writel(lcdcon1 & ~S3C2410_LCDCON1_ENVID, S3C2410_LCDCON1);
info->mach_info = pdev->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, IRQF_DISABLED, pdev->name, info);
if (ret) {
dev_err(&pdev->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_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(&pdev->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_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(struct s3c2410fb_info *fbi)
{
unsigned long flags;
local_irq_save(flags);
fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_ENVID;
writel(fbi->regs.lcdcon1, S3C2410_LCDCON1);
local_irq_restore(flags);
}
/*
* 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;
s3c2410fb_stop_lcd(info);
msleep(1);
s3c2410fb_unmap_video_memory(info);
if (info->clk) {
clk_disable(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 platform_device *dev, pm_message_t state)
{
struct fb_info *fbinfo = platform_get_drvdata(dev);
struct s3c2410fb_info *info = fbinfo->par;
s3c2410fb_stop_lcd(info);
/* 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 platform_device *dev)
{
struct fb_info *fbinfo = platform_get_drvdata(dev);
struct s3c2410fb_info *info = fbinfo->par;
clk_enable(info->clk);
msleep(1);
s3c2410fb_init_registers(info);
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",
.owner = THIS_MODULE,
},
};
int __devinit s3c2410fb_init(void)
{
return platform_driver_register(&s3c2410fb_driver);
}
static void __exit s3c2410fb_cleanup(void)
{
platform_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");
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