tgafb.c

S3C44B0X下的LCD （framebuffer）驱动资料与相关代码

/*
 *  linux/drivers/video/tgafb.c -- DEC 21030 TGA frame buffer device
 *
 *	Copyright (C) 1999,2000 Martin Lucina, Tom Zerucha
 *  
 *  $Id: tgafb.c,v 1.12.2.3 2000/04/04 06:44:56 mato Exp $
 *
 *  This driver is partly based on the original TGA framebuffer device, which 
 *  was partly based on the original TGA console driver, which are
 *
 *	Copyright (C) 1997 Geert Uytterhoeven
 *	Copyright (C) 1995 Jay Estabrook
 *
 *  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.
 */

/* KNOWN PROBLEMS/TO DO ===================================================== *
 *
 *	- How to set a single color register on 24-plane cards?
 *
 *	- Hardware cursor/other text acceleration methods
 *
 *	- Some redraws can stall kernel for several seconds
 *	  [This should now be solved by the fast memmove() patch in 2.3.6]
 *
 * KNOWN PROBLEMS/TO DO ==================================================== */

#include <linux/module.h>
#include <linux/sched.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/vmalloc.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/selection.h>
#include <linux/console.h>
#include <asm/io.h>

#include <video/fbcon.h>
#include <video/fbcon-cfb8.h>
#include <video/fbcon-cfb32.h>
#include "tgafb.h"


    /*
     *  Global declarations
     */

static struct tgafb_info fb_info;
static struct tgafb_par current_par;
static int current_par_valid = 0;
static struct display disp;

static char default_fontname[40] __initdata = { 0 };
static struct fb_var_screeninfo default_var;
static int default_var_valid = 0;

static int currcon = 0;

static struct { u_char red, green, blue, pad; } palette[256];
#ifdef FBCON_HAS_CFB32
static u32 fbcon_cfb32_cmap[16];
#endif


    /*
     *  Hardware presets
     */

static unsigned int fb_offset_presets[4] = {
	TGA_8PLANE_FB_OFFSET,
	TGA_24PLANE_FB_OFFSET,
	0xffffffff,
	TGA_24PLUSZ_FB_OFFSET
};

static unsigned int deep_presets[4] = {
  0x00014000,
  0x0001440d,
  0xffffffff,
  0x0001441d
};

static unsigned int rasterop_presets[4] = {
  0x00000003,
  0x00000303,
  0xffffffff,
  0x00000303
};

static unsigned int mode_presets[4] = {
  0x00002000,
  0x00002300,
  0xffffffff,
  0x00002300
};

static unsigned int base_addr_presets[4] = {
  0x00000000,
  0x00000001,
  0xffffffff,
  0x00000001
};


    /*
     *  Predefined video modes
     *  This is a subset of the standard VESA modes, recalculated from XFree86.
     *
     *  XXX Should we store these in terms of the encoded par structs? Even better,
     *      fbcon should provide a general mechanism for doing something like this.
     */

static struct {
    const char *name;
    struct fb_var_screeninfo var;
} tgafb_predefined[] __initdata = {
    { "640x480-60", {
	640, 480, 640, 480, 0, 0, 0, 0,
	{0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	0, 0, -1, -1, FB_ACCELF_TEXT, 39722, 40, 24, 32, 11, 96, 2,
	0,
	FB_VMODE_NONINTERLACED
    }},
    { "800x600-56", {
	800, 600, 800, 600, 0, 0, 0, 0,
	{0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	0, 0, -1, -1, FB_ACCELF_TEXT, 27777, 128, 24, 22, 1, 72, 2,
	0,
	FB_VMODE_NONINTERLACED
    }},
    { "640x480-72", {
	640, 480, 640, 480, 0, 0, 0, 0,
	{0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	0, 0, -1, -1, FB_ACCELF_TEXT, 31746, 144, 40, 30, 8, 40, 3,
	0,
	FB_VMODE_NONINTERLACED
    }},
    { "800x600-60", {
	800, 600, 800, 600, 0, 0, 0, 0,
	{0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	0, 0, -1, -1, FB_ACCELF_TEXT, 25000, 88, 40, 23, 1, 128, 4,
	FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT,
	FB_VMODE_NONINTERLACED
    }},
    { "800x600-72", {
	800, 600, 800, 600, 0, 0, 0, 0,
	{0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	0, 0, -1, -1, FB_ACCELF_TEXT, 20000, 64, 56, 23, 37, 120, 6,
	FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT,
	FB_VMODE_NONINTERLACED
    }},
    { "1024x768-60", {
	1024, 768, 1024, 768, 0, 0, 0, 0,
	{0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	0, 0, -1, -1, FB_ACCELF_TEXT, 15384, 168, 8, 29, 3, 144, 6,
	0,
	FB_VMODE_NONINTERLACED
    }},
    { "1152x864-60", {
	1152, 864, 1152, 864, 0, 0, 0, 0,
	{0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	0, 0, -1, -1, FB_ACCELF_TEXT, 11123, 208, 64, 16, 4, 256, 8,
	0,
	FB_VMODE_NONINTERLACED
    }},
    { "1024x768-70", {
	1024, 768, 1024, 768, 0, 0, 0, 0,
	{0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	0, 0, -1, -1, FB_ACCELF_TEXT, 13333, 144, 24, 29, 3, 136, 6,
	0,
	FB_VMODE_NONINTERLACED
    }},
    { "1024x768-76", {
	1024, 768, 1024, 768, 0, 0, 0, 0,
	{0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	0, 0, -1, -1, FB_ACCELF_TEXT, 11764, 208, 8, 36, 16, 120, 3,
	0,
	FB_VMODE_NONINTERLACED
    }},
    { "1152x864-70", {
	1152, 864, 1152, 864, 0, 0, 0, 0,
	{0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	0, 0, -1, -1, FB_ACCELF_TEXT, 10869, 106, 56, 20, 1, 160, 10,
	0,
	FB_VMODE_NONINTERLACED
    }},
    { "1280x1024-61", {
	1280, 1024, 1280, 1024, 0, 0, 0, 0,
	{0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	0, 0, -1, -1, FB_ACCELF_TEXT, 9090, 200, 48, 26, 1, 184, 3,
	0,
	FB_VMODE_NONINTERLACED
    }},
    { "1024x768-85", {
	1024, 768, 1024, 768, 0, 0, 0, 0,
	{0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	0, 0, -1, -1, FB_ACCELF_TEXT, 10111, 192, 32, 34, 14, 160, 6,
	0,
	FB_VMODE_NONINTERLACED
    }},
    { "1280x1024-70", {
	1280, 1024, 1280, 1024, 0, 0, 0, 0,
	{0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	0, 0, -1, -1, FB_ACCELF_TEXT, 7905, 224, 32, 28, 8, 160, 8,
	0,
	FB_VMODE_NONINTERLACED
    }},
    { "1152x864-84", {
	1152, 864, 1152, 864, 0, 0, 0, 0,
	{0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	0, 0, -1, -1, FB_ACCELF_TEXT, 7407, 184, 312, 32, 0, 128, 12,
	0,
	FB_VMODE_NONINTERLACED
    }},
    { "1280x1024-76", {
	1280, 1024, 1280, 1024, 0, 0, 0, 0,
	{0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	0, 0, -1, -1, FB_ACCELF_TEXT, 7407, 248, 32, 34, 3, 104, 3,
	0,
	FB_VMODE_NONINTERLACED
    }},
    { "1280x1024-85", {
	1280, 1024, 1280, 1024, 0, 0, 0, 0,
	{0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	0, 0, -1, -1, FB_ACCELF_TEXT, 6349, 224, 64, 44, 1, 160, 3,
	0,
	FB_VMODE_NONINTERLACED
    }},

    /* These are modes used by the two fixed-frequency monitors I have at home. 
     * You may or may not find these useful.
     */

    { "WYSE1", {			/* 1280x1024 @ 72 Hz, 130 Mhz clock */
	1280, 1024, 1280, 1024, 0, 0, 0, 0,
	{0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	0, 0, -1, -1, FB_ACCELF_TEXT, 7692, 192, 32, 47, 0, 192, 5,
	FB_SYNC_HOR_HIGH_ACT|FB_SYNC_VERT_HIGH_ACT,
	FB_VMODE_NONINTERLACED
    }},
    { "IBM3", {				/* 1280x1024 @ 70 Hz, 120 Mhz clock */
	1280, 1024, 1280, 1024, 0, 0, 0, 0,
	{0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
	0, 0, -1, -1, FB_ACCELF_TEXT, 8333, 192, 32, 47, 0, 192, 5,
	0,
	FB_VMODE_NONINTERLACED
    }}
};

#define NUM_TOTAL_MODES    ARRAY_SIZE(tgafb_predefined)


    /*
     *  Interface used by the world
     */

static void tgafb_detect(void);
static int tgafb_encode_fix(struct fb_fix_screeninfo *fix, const void *fb_par,
		        struct fb_info_gen *info);
static int tgafb_decode_var(const struct fb_var_screeninfo *var, void *fb_par,
		        struct fb_info_gen *info);
static int tgafb_encode_var(struct fb_var_screeninfo *var, const void *fb_par,
		        struct fb_info_gen *info);
static void tgafb_get_par(void *fb_par, struct fb_info_gen *info);
static void tgafb_set_par(const void *fb_par, struct fb_info_gen *info);
static int tgafb_getcolreg(u_int regno, u_int *red, u_int *green, u_int *blue, 
		u_int *transp, struct fb_info *info);
static int tgafb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, 
		u_int transp, struct fb_info *info);
static int tgafb_blank(int blank, struct fb_info_gen *info);
static void tgafb_set_disp(const void *fb_par, struct display *disp, 
		struct fb_info_gen *info);

#ifndef MODULE
int tgafb_setup(char*);
#endif

static void tgafb_set_pll(int f);
#if 1
static int tgafb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
			  struct fb_info *info);
static void tgafb_update_palette(void);
#endif


    /*
     *  Chipset specific functions
     */


static void tgafb_detect(void)
{
    return;
}


static int tgafb_encode_fix(struct fb_fix_screeninfo *fix, const void *fb_par,
	struct fb_info_gen *info)
{
    struct tgafb_par *par = (struct tgafb_par *)fb_par;

    strcpy(fix->id, fb_info.gen.info.modename);

    fix->type = FB_TYPE_PACKED_PIXELS;
    fix->type_aux = 0;
    if (fb_info.tga_type == TGA_TYPE_8PLANE) {
	fix->visual = FB_VISUAL_PSEUDOCOLOR;
    } else {
	fix->visual = FB_VISUAL_TRUECOLOR;
    }

    fix->line_length = par->xres * (par->bits_per_pixel >> 3);
    fix->smem_start = fb_info.tga_fb_base;
    fix->smem_len = fix->line_length * par->yres;
    fix->mmio_start = fb_info.tga_regs_base;
    fix->mmio_len = 0x1000;		/* Is this sufficient? */
    fix->xpanstep = fix->ypanstep = fix->ywrapstep = 0;
    fix->accel = FB_ACCEL_DEC_TGA;

    return 0;
}


static int tgafb_decode_var(const struct fb_var_screeninfo *var, void *fb_par,
	struct fb_info_gen *info)
{
    struct tgafb_par *par = (struct tgafb_par *)fb_par;

    /* round up some */
    if (fb_info.tga_type == TGA_TYPE_8PLANE) {
	if (var->bits_per_pixel > 8) {
	    return -EINVAL;
	}
	par->bits_per_pixel = 8;
    } else {
	if (var->bits_per_pixel > 32) {
	    return -EINVAL;
	}
	par->bits_per_pixel = 32;
    }

    /* check the values for sanity */
    if (var->xres_virtual != var->xres ||
	var->yres_virtual != var->yres ||
	var->nonstd || (1000000000/var->pixclock) > TGA_PLL_MAX_FREQ ||
	(var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED
#if 0	/* fbmon not done.  uncomment for 2.5.x -brad */
	|| !fbmon_valid_timings(var->pixclock, var->htotal, var->vtotal, info))
#else
	)
#endif
	return -EINVAL;

    /* encode video timings */
    par->htimings = ((var->xres/4) & TGA_HORIZ_ACT_LSB) | 
	(((var->xres/4) & 0x600 << 19) & TGA_HORIZ_ACT_MSB);
    par->vtimings = (var->yres & TGA_VERT_ACTIVE);
    par->htimings |= ((var->right_margin/4) << 9) & TGA_HORIZ_FP;
    par->vtimings |= (var->lower_margin << 11) & TGA_VERT_FP;
    par->htimings |= ((var->hsync_len/4) << 14) & TGA_HORIZ_SYNC;
    par->vtimings |= (var->vsync_len << 16) & TGA_VERT_SYNC;
    par->htimings |= ((var->left_margin/4) << 21) & TGA_HORIZ_BP;
    par->vtimings |= (var->upper_margin << 22) & TGA_VERT_BP;

    if (var->sync & FB_SYNC_HOR_HIGH_ACT)
	par->htimings |= TGA_HORIZ_POLARITY;
    if (var->sync & FB_SYNC_VERT_HIGH_ACT)
	par->vtimings |= TGA_VERT_POLARITY;
    if (var->sync & FB_SYNC_ON_GREEN) {
	par->sync_on_green = 1;
    } else {
	par->sync_on_green = 0;
    }

    /* store other useful values in par */
    par->xres = var->xres; 
    par->yres = var->yres;
    par->pll_freq = 1000000000/var->pixclock;
    par->bits_per_pixel = var->bits_per_pixel;

    return 0;
}


static int tgafb_encode_var(struct fb_var_screeninfo *var, const void *fb_par,
	struct fb_info_gen *info)
{
    struct tgafb_par *par = (struct tgafb_par *)fb_par;

    /* decode video timings */
    var->xres = ((par->htimings & TGA_HORIZ_ACT_LSB) | ((par->htimings & TGA_HORIZ_ACT_MSB) >> 19)) * 4;
    var->yres = (par->vtimings & TGA_VERT_ACTIVE);
    var->right_margin = ((par->htimings & TGA_HORIZ_FP) >> 9) * 4;
    var->lower_margin = ((par->vtimings & TGA_VERT_FP) >> 11);
    var->hsync_len = ((par->htimings & TGA_HORIZ_SYNC) >> 14) * 4;
    var->vsync_len = ((par->vtimings & TGA_VERT_SYNC) >> 16);
    var->left_margin = ((par->htimings & TGA_HORIZ_BP) >> 21) * 4;
    var->upper_margin = ((par->vtimings & TGA_VERT_BP) >> 22);

    if (par->htimings & TGA_HORIZ_POLARITY) 
    	var->sync |= FB_SYNC_HOR_HIGH_ACT;
    if (par->vtimings & TGA_VERT_POLARITY)
    	var->sync |= FB_SYNC_VERT_HIGH_ACT;
    if (par->sync_on_green == 1)
	var->sync |= FB_SYNC_ON_GREEN;

    var->xres_virtual = var->xres;
    var->yres_virtual = var->yres;
    var->xoffset = var->yoffset = 0;

    /* depth-related */
    if (fb_info.tga_type == TGA_TYPE_8PLANE) {
	var->red.offset = 0;
	var->green.offset = 0;
	var->blue.offset = 0;
    } else {
	var->red.offset = 16;
	var->green.offset = 8;
	var->blue.offset = 0;
    }
    var->bits_per_pixel = par->bits_per_pixel;
    var->grayscale = 0;
    var->red.length = var->green.length = var->blue.length = 8;
    var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0;
    var->transp.offset = var->transp.length = var->transp.msb_right = 0;

    /* others */
    var->xoffset = var->yoffset = 0;
    var->pixclock = 1000000000/par->pll_freq;
    var->nonstd = 0;
    var->activate = 0;
    var->height = var->width = -1;
    var->accel_flags = 0;

    return 0;
}


static void tgafb_get_par(void *fb_par, struct fb_info_gen *info)
{
    struct tgafb_par *par = (struct tgafb_par *)fb_par;

    if (current_par_valid)
	*par = current_par;
    else {
	if (fb_info.tga_type == TGA_TYPE_8PLANE)
	    default_var.bits_per_pixel = 8;
	else
	    default_var.bits_per_pixel = 32;

	tgafb_decode_var(&default_var, par, info);
    }
}


static void tgafb_set_par(const void *fb_par, struct fb_info_gen *info)
{
    int i, j;
    struct tgafb_par *par = (struct tgafb_par *)fb_par;

#if 0
    /* XXX this will break console switching with X11, maybe I need to test KD_GRAPHICS? */
    /* if current_par is valid, check to see if we need to change anything */
    if (current_par_valid) {
	if (!memcmp(par, &current_par, sizeof current_par)) {
	    return;
	}
    }
#endif
    current_par = *par;
    current_par_valid = 1;

    /* first, disable video */
    TGA_WRITE_REG(TGA_VALID_VIDEO | TGA_VALID_BLANK, TGA_VALID_REG);
    
    /* write the DEEP register */
    while (TGA_READ_REG(TGA_CMD_STAT_REG) & 1) /* wait for not busy */
      continue;

    mb();
    TGA_WRITE_REG(deep_presets[fb_info.tga_type], TGA_DEEP_REG);
    while (TGA_READ_REG(TGA_CMD_STAT_REG) & 1) /* wait for not busy */
	continue;
    mb();

    /* write some more registers */
    TGA_WRITE_REG(rasterop_presets[fb_info.tga_type], TGA_RASTEROP_REG);
    TGA_WRITE_REG(mode_presets[fb_info.tga_type], TGA_MODE_REG);
    TGA_WRITE_REG(base_addr_presets[fb_info.tga_type], TGA_BASE_ADDR_REG);

    /* calculate & write the PLL */
    tgafb_set_pll(par->pll_freq);

    /* write some more registers */
    TGA_WRITE_REG(0xffffffff, TGA_PLANEMASK_REG);
    TGA_WRITE_REG(0xffffffff, TGA_PIXELMASK_REG);