hgafb.c

S3C44B0X下的LCD （framebuffer）驱动资料与相关代码

/*
 * linux/drivers/video/hgafb.c -- Hercules graphics adaptor frame buffer device
 * 
 *      Created 25 Nov 1999 by Ferenc Bakonyi ([e-mail])
 *      Based on skeletonfb.c by Geert Uytterhoeven and
 *               mdacon.c by Andrew Apted
 *
 * History:
 *
 * - Revision 0.1.7 (23 Jan 2001): fix crash resulting from MDA only cards 
 *				   being detected as Hercules.	 (Paul G.)
 * - Revision 0.1.6 (17 Aug 2000): new style structs
 *                                 documentation
 * - Revision 0.1.5 (13 Mar 2000): spinlocks instead of saveflags();cli();etc
 *                                 minor fixes
 * - Revision 0.1.4 (24 Jan 2000): fixed a bug in hga_card_detect() for 
 *                                  HGA-only systems
 * - Revision 0.1.3 (22 Jan 2000): modified for the new fb_info structure
 *                                 screen is cleared after rmmod
 *                                 virtual resolutions
 *                                 kernel parameter 'video=hga:font:{fontname}'
 *                                 module parameter 'font={fontname}'
 *                                 module parameter 'nologo={0|1}'
 *                                 the most important: boot logo :)
 * - Revision 0.1.0  (6 Dec 1999): faster scrolling and minor fixes
 * - First release  (25 Nov 1999)
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/spinlock.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/ioport.h>
#include <asm/io.h>
#include <asm/vga.h>
#include <video/fbcon.h>
#include <video/fbcon-hga.h>

#ifdef MODULE

#define INCLUDE_LINUX_LOGO_DATA
#include <linux/linux_logo.h>

#endif /* MODULE */

#if 0
#define DPRINTK(args...) printk(KERN_DEBUG __FILE__": " ##args)
#else
#define DPRINTK(args...)
#endif

#if 0
#define CHKINFO(ret) if (info != &fb_info) { printk(KERN_DEBUG __FILE__": This should never happen, line:%d \n", __LINE__); return ret; }
#else
#define CHKINFO(ret)
#endif

/* Description of the hardware layout */

static unsigned long hga_vram_base;		/* Base of video memory */
static unsigned long hga_vram_len;		/* Size of video memory */

#define HGA_TXT			0
#define HGA_GFX			1

static int hga_mode = -1;			/* 0 = txt, 1 = gfx mode */

static enum { TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } hga_type;
static char *hga_type_name;

#define HGA_INDEX_PORT		0x3b4		/* Register select port */
#define HGA_VALUE_PORT		0x3b5		/* Register value port */
#define HGA_MODE_PORT		0x3b8		/* Mode control port */
#define HGA_STATUS_PORT		0x3ba		/* Status and Config port */
#define HGA_GFX_PORT		0x3bf		/* Graphics control port */

/* HGA register values */

#define HGA_CURSOR_BLINKING	0x00
#define HGA_CURSOR_OFF		0x20
#define HGA_CURSOR_SLOWBLINK	0x60

#define HGA_MODE_GRAPHICS	0x02
#define HGA_MODE_VIDEO_EN	0x08
#define HGA_MODE_BLINK_EN	0x20
#define HGA_MODE_GFX_PAGE1	0x80

#define HGA_STATUS_HSYNC	0x01
#define HGA_STATUS_VSYNC	0x80
#define HGA_STATUS_VIDEO	0x08

#define HGA_CONFIG_COL132	0x08
#define HGA_GFX_MODE_EN		0x01
#define HGA_GFX_PAGE_EN		0x02

/* Global locks */

static spinlock_t hga_reg_lock = SPIN_LOCK_UNLOCKED;

/* Framebuffer driver structures */

static struct fb_var_screeninfo hga_default_var = {
	xres:		720,
	yres:		348,
	xres_virtual:	720,
	yres_virtual:	348,
	xoffset:	0,
	yoffset:	0,
	bits_per_pixel:	1,
	grayscale:	0,
	red:		{0, 1, 0},
	green:		{0, 1, 0},
	blue:		{0, 1, 0},
	transp:		{0, 0, 0},
	nonstd:		0,			/* (FB_NONSTD_HGA ?) */
	activate:	0,
	height:		-1,
	width:		-1,
	accel_flags:	0,
	/* pixclock */
	/* left_margin, right_margin */
	/* upper_margin, lower_margin */
	/* hsync_len, vsync_len */
	/* sync */
	/* vmode */
};

static struct fb_fix_screeninfo hga_fix = {
	id:		"HGA",
	smem_start:	(unsigned long) NULL,
	smem_len:	0,
	type:		FB_TYPE_PACKED_PIXELS,	/* (not sure) */
	type_aux:	0,			/* (not sure) */
	visual:		FB_VISUAL_MONO10,
	xpanstep:	8,
	ypanstep:	8,
	ywrapstep:	0,
	line_length:	90,
	mmio_start:	0,
	mmio_len:	0,
	accel:		FB_ACCEL_NONE
};

static struct fb_info fb_info;
static struct display disp;

/* Don't assume that tty1 will be the initial current console. */
static int currcon = -1; 
static int release_io_port = 0;
static int release_io_ports = 0;

#ifdef MODULE
static char *font = NULL;
static int nologo = 0;
#endif

/* -------------------------------------------------------------------------
 *
 * Low level hardware functions
 *
 * ------------------------------------------------------------------------- */

static void write_hga_b(unsigned int val, unsigned char reg)
{
	outb_p(reg, HGA_INDEX_PORT); 
	outb_p(val, HGA_VALUE_PORT);
}

static void write_hga_w(unsigned int val, unsigned char reg)
{
	outb_p(reg,   HGA_INDEX_PORT); outb_p(val >> 8,   HGA_VALUE_PORT);
	outb_p(reg+1, HGA_INDEX_PORT); outb_p(val & 0xff, HGA_VALUE_PORT);
}

static int test_hga_b(unsigned char val, unsigned char reg)
{
	outb_p(reg, HGA_INDEX_PORT); 
	outb  (val, HGA_VALUE_PORT);
	udelay(20); val = (inb_p(HGA_VALUE_PORT) == val);
	return val;
}

static void hga_clear_screen(void)
{
	unsigned char fillchar = 0xbf; /* magic */
	unsigned long flags;

	spin_lock_irqsave(&hga_reg_lock, flags);
	if (hga_mode == HGA_TXT)
		fillchar = ' ';
	else if (hga_mode == HGA_GFX)
		fillchar = 0x00;
	spin_unlock_irqrestore(&hga_reg_lock, flags);
	if (fillchar != 0xbf)
		isa_memset_io(hga_vram_base, fillchar, hga_vram_len);
}


#ifdef MODULE
static void hga_txt_mode(void)
{
	unsigned long flags;

	spin_lock_irqsave(&hga_reg_lock, flags);
	outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_BLINK_EN, HGA_MODE_PORT);
	outb_p(0x00, HGA_GFX_PORT);
	outb_p(0x00, HGA_STATUS_PORT);

	write_hga_b(0x61, 0x00);	/* horizontal total */
	write_hga_b(0x50, 0x01);	/* horizontal displayed */
	write_hga_b(0x52, 0x02);	/* horizontal sync pos */
	write_hga_b(0x0f, 0x03);	/* horizontal sync width */

	write_hga_b(0x19, 0x04);	/* vertical total */
	write_hga_b(0x06, 0x05);	/* vertical total adjust */
	write_hga_b(0x19, 0x06);	/* vertical displayed */
	write_hga_b(0x19, 0x07);	/* vertical sync pos */

	write_hga_b(0x02, 0x08);	/* interlace mode */
	write_hga_b(0x0d, 0x09);	/* maximum scanline */
	write_hga_b(0x0c, 0x0a);	/* cursor start */
	write_hga_b(0x0d, 0x0b);	/* cursor end */

	write_hga_w(0x0000, 0x0c);	/* start address */
	write_hga_w(0x0000, 0x0e);	/* cursor location */

	hga_mode = HGA_TXT;
	spin_unlock_irqrestore(&hga_reg_lock, flags);
}
#endif /* MODULE */

static void hga_gfx_mode(void)
{
	unsigned long flags;

	spin_lock_irqsave(&hga_reg_lock, flags);
	outb_p(0x00, HGA_STATUS_PORT);
	outb_p(HGA_GFX_MODE_EN, HGA_GFX_PORT);
	outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_GRAPHICS, HGA_MODE_PORT);

	write_hga_b(0x35, 0x00);	/* horizontal total */
	write_hga_b(0x2d, 0x01);	/* horizontal displayed */
	write_hga_b(0x2e, 0x02);	/* horizontal sync pos */
	write_hga_b(0x07, 0x03);	/* horizontal sync width */

	write_hga_b(0x5b, 0x04);	/* vertical total */
	write_hga_b(0x02, 0x05);	/* vertical total adjust */
	write_hga_b(0x57, 0x06);	/* vertical displayed */
	write_hga_b(0x57, 0x07);	/* vertical sync pos */

	write_hga_b(0x02, 0x08);	/* interlace mode */
	write_hga_b(0x03, 0x09);	/* maximum scanline */
	write_hga_b(0x00, 0x0a);	/* cursor start */
	write_hga_b(0x00, 0x0b);	/* cursor end */

	write_hga_w(0x0000, 0x0c);	/* start address */
	write_hga_w(0x0000, 0x0e);	/* cursor location */

	hga_mode = HGA_GFX;
	spin_unlock_irqrestore(&hga_reg_lock, flags);
}

#ifdef MODULE
static void hga_show_logo(void)
{
	int x, y;
	unsigned long dest = hga_vram_base;
	char *logo = linux_logo_bw;
	for (y = 134; y < 134 + 80 ; y++) /* this needs some cleanup */
		for (x = 0; x < 10 ; x++)
			isa_writeb(~*(logo++),
				   (dest + (y%4)*8192 + (y>>2)*90 + x + 40));
}
#endif /* MODULE */	

static void hga_pan(unsigned int xoffset, unsigned int yoffset)
{
	unsigned int base;
	unsigned long flags;
	
	base = (yoffset / 8) * 90 + xoffset;
	spin_lock_irqsave(&hga_reg_lock, flags);
	write_hga_w(base, 0x0c);	/* start address */
	spin_unlock_irqrestore(&hga_reg_lock, flags);
	DPRINTK("hga_pan: base:%d\n", base);
}

static void hga_blank(int blank_mode)
{
	unsigned long flags;

	spin_lock_irqsave(&hga_reg_lock, flags);
	if (blank_mode) {
		outb_p(0x00, HGA_MODE_PORT);	/* disable video */
	} else {
		outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_GRAPHICS, HGA_MODE_PORT);
	}
	spin_unlock_irqrestore(&hga_reg_lock, flags);
}

static int __init hga_card_detect(void)
{
	int count=0;
	unsigned long p, q;
	unsigned short p_save, q_save;

	hga_vram_base = 0xb0000;
	hga_vram_len  = 0x08000;

	if (request_region(0x3b0, 12, "hgafb"))
		release_io_ports = 1;
	if (request_region(0x3bf, 1, "hgafb"))
		release_io_port = 1;

	/* do a memory check */

	p = hga_vram_base;
	q = hga_vram_base + 0x01000;

	p_save = isa_readw(p); q_save = isa_readw(q);

	isa_writew(0xaa55, p); if (isa_readw(p) == 0xaa55) count++;
	isa_writew(0x55aa, p); if (isa_readw(p) == 0x55aa) count++;
	isa_writew(p_save, p);

	if (count != 2) {
		return 0;
	}

	/* Ok, there is definitely a card registering at the correct
	 * memory location, so now we do an I/O port test.
	 */
	
	if (!test_hga_b(0x66, 0x0f)) {	    /* cursor low register */
		return 0;
	}
	if (!test_hga_b(0x99, 0x0f)) {     /* cursor low register */
		return 0;
	}

	/* See if the card is a Hercules, by checking whether the vsync
	 * bit of the status register is changing.  This test lasts for
	 * approximately 1/10th of a second.
	 */
	
	p_save = q_save = inb_p(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;

	for (count=0; count < 50000 && p_save == q_save; count++) {
		q_save = inb(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;
		udelay(2);
	}

	if (p_save == q_save) 
		return 0;

	switch (inb_p(HGA_STATUS_PORT) & 0x70) {
		case 0x10:
			hga_type = TYPE_HERCPLUS;
			hga_type_name = "HerculesPlus";
			break;
		case 0x50:
			hga_type = TYPE_HERCCOLOR;
			hga_type_name = "HerculesColor";
			break;
		default:
			hga_type = TYPE_HERC;
			hga_type_name = "Hercules";
			break;
	}
	return 1;
}

/* ------------------------------------------------------------------------- *
 *
 * dispsw functions
 *
 * ------------------------------------------------------------------------- */

/**
 *	hga_get_fix - get the fixed part of the display
 *	@fix:struct fb_fix_screeninfo to fill in
 *	@con:unused
 *	@info:pointer to fb_info object containing info for current hga board
 *
 *	This wrapper function copies @info->fix to @fix.
 *	A zero is returned on success and %-EINVAL for failure.
 */

int hga_get_fix(struct fb_fix_screeninfo *fix, int con, struct fb_info *info)
{
	CHKINFO(-EINVAL);
	DPRINTK("hga_get_fix: con:%d, info:%x, fb_info:%x\n", con, (unsigned)info, (unsigned)&fb_info);

	*fix = info->fix;
	return 0;
}

/**
 *	hga_get_var - get the user defined part of the display
 *	@var:struct fb_var_screeninfo to fill in
 *	@con:unused
 *	@info:pointer to fb_info object containing info for current hga board
 *
 *	This wrapper function copies @info->var to @var.
 *	A zero is returned on success and %-EINVAL for failure.
 */

int hga_get_var(struct fb_var_screeninfo *var, int con, struct fb_info *info)
{
	CHKINFO(-EINVAL);
	DPRINTK("hga_get_var: con:%d, info:%x, fb_info:%x\n", con, (unsigned)info, (unsigned)&fb_info);

	*var = info->var;
	return 0;
}

/**