au1100fb.c

S3C44B0X下的LCD （framebuffer）驱动资料与相关代码

/*
 * BRIEF MODULE DESCRIPTION
 *	Au1100 LCD Driver.
 *
 * Copyright 2002 MontaVista Software
 * Author: MontaVista Software, Inc.
 *		[e-mail] or [e-mail]
 *
 * Copyright 2002 Alchemy Semiconductor
 * Author: Alchemy Semiconductor
 *
 * Based on:
 * linux/drivers/video/skeletonfb.c -- Skeleton for a frame buffer device
 *  Created 28 Dec 1997 by Geert Uytterhoeven
 *
 *  This program is free software; you can redistribute	 it and/or modify it
 *  under  the terms of	 the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the	License, or (at your
 *  option) any later version.
 *
 *  THIS  SOFTWARE  IS PROVIDED	  ``AS	IS'' AND   ANY	EXPRESS OR IMPLIED
 *  WARRANTIES,	  INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO	EVENT  SHALL   THE AUTHOR  BE	 LIABLE FOR ANY	  DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED	  TO, PROCUREMENT OF  SUBSTITUTE GOODS	OR SERVICES; LOSS OF
 *  USE, DATA,	OR PROFITS; OR	BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN	 CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  You should have received a copy of the  GNU General Public License along
 *  with this program; if not, write  to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */

#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/pci.h>

#include <asm/au1000.h>
#include <asm/pb1100.h>
#include "au1100fb.h"

#include <video/fbcon.h>
#include <video/fbcon-mfb.h>
#include <video/fbcon-cfb2.h>
#include <video/fbcon-cfb4.h>
#include <video/fbcon-cfb8.h>
#include <video/fbcon-cfb16.h>

/* 
 * Sanity check. If this is a new Au1100 based board, search for
 * the PB1100 ifdefs to make sure you modify the code accordingly.
 */
#if defined(CONFIG_MIPS_PB1100) || defined(CONFIG_MIPS_DB1100)
#else
error Unknown Au1100 board
#endif

#define CMAPSIZE 16

static int my_lcd_index; /* default is zero */
struct known_lcd_panels *p_lcd;
AU1100_LCD *p_lcd_reg = (AU1100_LCD *)AU1100_LCD_ADDR;

struct au1100fb_info {
	struct fb_info_gen gen;
	unsigned long fb_virt_start;
	unsigned long fb_size;
	unsigned long fb_phys;
	int mmaped;
	int nohwcursor;

	struct { unsigned red, green, blue, pad; } palette[256];

#if defined(FBCON_HAS_CFB16)
	u16 fbcon_cmap16[16];
#endif
};


struct au1100fb_par {
        struct fb_var_screeninfo var;
	
	int line_length;  // in bytes
	int cmap_len;     // color-map length
};


static struct au1100fb_info fb_info;
static struct au1100fb_par current_par;
static struct display disp;

int au1100fb_init(void);
void au1100fb_setup(char *options, int *ints);
static int au1100fb_mmap(struct fb_info *fb, struct file *file, 
		struct vm_area_struct *vma);
static int au1100_blank(int blank_mode, struct fb_info_gen *info);
static int au1100fb_ioctl(struct inode *inode, struct file *file, u_int cmd,
			  u_long arg, int con, struct fb_info *info);

void au1100_nocursor(struct display *p, int mode, int xx, int yy){};

static struct fb_ops au1100fb_ops = {
	owner:		THIS_MODULE,
	fb_get_fix:	fbgen_get_fix,
	fb_get_var:	fbgen_get_var,
	fb_set_var:	fbgen_set_var,
	fb_get_cmap:	fbgen_get_cmap,
	fb_set_cmap:	fbgen_set_cmap,
	fb_pan_display: fbgen_pan_display,
        fb_ioctl:       au1100fb_ioctl,
	fb_mmap:        au1100fb_mmap,
};

static void au1100_detect(void)
{
	/*
	 *  This function should detect the current video mode settings 
	 *  and store it as the default video mode
	 */

	/*
	 * Yeh, well, we're not going to change any settings so we're
	 * always stuck with the default ...
	 */

}

static int au1100_encode_fix(struct fb_fix_screeninfo *fix, 
		const void *_par, struct fb_info_gen *_info)
{
        struct au1100fb_info *info = (struct au1100fb_info *) _info;
        struct au1100fb_par *par = (struct au1100fb_par *) _par;
	struct fb_var_screeninfo *var = &par->var;

	memset(fix, 0, sizeof(struct fb_fix_screeninfo));

	fix->smem_start = info->fb_phys;
	fix->smem_len = info->fb_size;
	fix->type = FB_TYPE_PACKED_PIXELS;
	fix->type_aux = 0;
        fix->visual = (var->bits_per_pixel == 8) ?
	       	FB_VISUAL_PSEUDOCOLOR	: FB_VISUAL_TRUECOLOR;
	fix->ywrapstep = 0;
	fix->xpanstep = 1;
	fix->ypanstep = 1;
	fix->line_length = current_par.line_length;
	return 0;
}

static void set_color_bitfields(struct fb_var_screeninfo *var)
{
	switch (var->bits_per_pixel) {
	case 8:
		var->red.offset = 0;
		var->red.length = 8;
		var->green.offset = 0;
		var->green.length = 8;
		var->blue.offset = 0;
		var->blue.length = 8;
		var->transp.offset = 0;
		var->transp.length = 0;
		break;
	case 16:	/* RGB 565 */
		var->red.offset = 11;
		var->red.length = 5;
		var->green.offset = 5;
		var->green.length = 6;
		var->blue.offset = 0;
		var->blue.length = 5;
		var->transp.offset = 0;
		var->transp.length = 0;
		break;
	}

	var->red.msb_right = 0;
	var->green.msb_right = 0;
	var->blue.msb_right = 0;
	var->transp.msb_right = 0;
}

static int au1100_decode_var(const struct fb_var_screeninfo *var, 
		void *_par, struct fb_info_gen *_info)
{

	struct au1100fb_par *par = (struct au1100fb_par *)_par;

	/*
	 * Don't allow setting any of these yet: xres and yres don't
	 * make sense for LCD panels.
	 */
	if (var->xres != p_lcd->xres ||
	    var->yres != p_lcd->yres ||
	    var->xres != p_lcd->xres ||
	    var->yres != p_lcd->yres) {
		return -EINVAL;
	}
	if(var->bits_per_pixel != p_lcd->bpp) {
		return -EINVAL;
	}

	memset(par, 0, sizeof(struct au1100fb_par));
	par->var = *var;
	
	/* FIXME */
	switch (var->bits_per_pixel) {
		case 8:
			par->var.bits_per_pixel = 8;
			break;
		case 16:
			par->var.bits_per_pixel = 16;
			break;
		default:
			printk("color depth %d bpp not supported\n",
					var->bits_per_pixel);
			return -EINVAL;

	}
	set_color_bitfields(&par->var);
	par->cmap_len = (par->var.bits_per_pixel == 8) ? 256 : 16;
	return 0;
}

static int au1100_encode_var(struct fb_var_screeninfo *var, 
		const void *par, struct fb_info_gen *_info)
{

	*var = ((struct au1100fb_par *)par)->var;
	return 0;
}

static void 
au1100_get_par(void *_par, struct fb_info_gen *_info)
{
	*(struct au1100fb_par *)_par = current_par;
}

static void au1100_set_par(const void *par, struct fb_info_gen *info)
{
	/* nothing to do: we don't change any settings */
}

static int au1100_getcolreg(unsigned regno, unsigned *red, unsigned *green,
			 unsigned *blue, unsigned *transp,
			 struct fb_info *info)
{

	struct au1100fb_info* i = (struct au1100fb_info*)info;

	if (regno > 255)
		return 1;
   
	*red    = i->palette[regno].red; 
	*green  = i->palette[regno].green; 
	*blue   = i->palette[regno].blue; 
	*transp = 0;

	return 0;
}

static int au1100_setcolreg(unsigned regno, unsigned red, unsigned green,
			 unsigned blue, unsigned transp,
			 struct fb_info *info)
{
	struct au1100fb_info* i = (struct au1100fb_info *)info;
	u32 rgbcol;

	if (regno > 255)
		return 1;

	i->palette[regno].red    = red;
	i->palette[regno].green  = green;
	i->palette[regno].blue   = blue;
   
	switch(p_lcd->bpp) {
#ifdef FBCON_HAS_CFB8
	case 8:
		red >>= 10;
		green >>= 10;
		blue >>= 10;
		p_lcd_reg->lcd_pallettebase[regno] = (blue&0x1f) | 
			((green&0x3f)<<5) | ((red&0x1f)<<11);
		break;
#endif
#ifdef FBCON_HAS_CFB16
	case 16:
		i->fbcon_cmap16[regno] =
			((red & 0xf800) >> 0) |
			((green & 0xfc00) >> 5) |
			((blue & 0xf800) >> 11);
		break;
#endif
	default:
		break;
	}

	return 0;
}


static int  au1100_blank(int blank_mode, struct fb_info_gen *_info)
{

	switch (blank_mode) {
	case VESA_NO_BLANKING:
		/* turn on panel */
		//printk("turn on panel\n");
#ifdef CONFIG_MIPS_PB1100
		p_lcd_reg->lcd_control |= LCD_CONTROL_GO;
		au_writew(au_readw(PB1100_G_CONTROL) | p_lcd->mode_backlight, 
			PB1100_G_CONTROL);
#endif
		au_sync();
		break;

	case VESA_VSYNC_SUSPEND:
	case VESA_HSYNC_SUSPEND:
	case VESA_POWERDOWN:
		/* turn off panel */
		//printk("turn off panel\n");
#ifdef CONFIG_MIPS_PB1100
		au_writew(au_readw(PB1100_G_CONTROL) & ~p_lcd->mode_backlight, 
			PB1100_G_CONTROL);