/*
 * $Id: hitfb.c,v 1.2 2000/07/04 06:24:46 yaegashi Exp $
 * linux/drivers/video/hitfb.c -- Hitachi LCD frame buffer device
 * (C) 1999 Mihai Spatar
 * (C) 2000 YAEGASHI Takeshi
 *
 *  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/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/malloc.h>
#include <linux/delay.h>
#include <linux/nubus.h>
#include <linux/init.h>

#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/io.h>

#include <linux/fb.h>

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

#include <asm/hd64461.h>

#define CONFIG_SH_LCD_VIDEOBASE		CONFIG_HD64461_IOBASE+0x2000000

/* These are for HP Jornada 680/690.
   It is desired that they are configurable...  */
#define CONFIG_SH_LCD_VIDEOSIZE		1024*1024
#define CONFIG_SH_LCD_HORZ		640
#define CONFIG_SH_LCD_VERT		240
#define CONFIG_SH_LCD_DEFAULTBPP	16

struct hitfb_info {
    struct fb_info_gen gen;
};

struct hitfb_par
{
    int x, y;
    int bpp;
};

static struct hitfb_info fb_info;
static struct hitfb_par current_par;
static int current_par_valid = 0;
static struct display disp;

static union {
#ifdef FBCON_HAS_CFB16
    u16 cfb16[16];
#endif
} fbcon_cmap;

unsigned long hit_videobase, hit_videosize;
static struct fb_var_screeninfo default_var;

int hitfb_init(void);

static void hitfb_set_par(struct hitfb_par *par, const struct fb_info *info);
static void hitfb_encode_var(struct fb_var_screeninfo *var, 
			     struct hitfb_par *par,
			     const struct fb_info *info);


static void hitfb_detect(void)
{
    struct hitfb_par par;

    hit_videobase = CONFIG_SH_LCD_VIDEOBASE;
    hit_videosize = CONFIG_SH_LCD_VIDEOSIZE;

    par.x = CONFIG_SH_LCD_HORZ;
    par.y = CONFIG_SH_LCD_VERT;
    par.bpp = CONFIG_SH_LCD_DEFAULTBPP;

    hitfb_set_par(&par, NULL);
    hitfb_encode_var(&default_var, &par, NULL);
}

static int hitfb_encode_fix(struct fb_fix_screeninfo *fix,
			    struct hitfb_par *par,
			    const struct fb_info *info)
{
    memset(fix, 0, sizeof(struct fb_fix_screeninfo));

    strcpy(fix->id, "Hitachi HD64461");
    fix->smem_start = hit_videobase;
    fix->smem_len = hit_videosize;
    fix->type = FB_TYPE_PACKED_PIXELS;
    fix->type_aux = 0;
    fix->visual = FB_VISUAL_TRUECOLOR;
    fix->xpanstep = 0;
    fix->ypanstep = 0;
    fix->ywrapstep = 0;

    switch(par->bpp) {
    default:
    case 8:
	fix->line_length = par->x;
	break;
    case 16:
	fix->line_length = par->x*2;
	break;
    }

    return 0;
}


static int hitfb_decode_var(struct fb_var_screeninfo *var,
			    struct hitfb_par *par,
			    const struct fb_info *info)
{
    par->x = var->xres;
    par->y = var->yres;
    par->bpp = var->bits_per_pixel;
    return 0;
}


static void hitfb_encode_var(struct fb_var_screeninfo *var, 
			     struct hitfb_par *par,
			     const struct fb_info *info)
{
    memset(var, 0, sizeof(*var));

    var->xres = par->x;
    var->yres = par->y;
    var->xres_virtual = var->xres;
    var->yres_virtual = var->yres;
    var->xoffset = 0;
    var->yoffset = 0;
    var->bits_per_pixel = par->bpp;
    var->grayscale = 0;
    var->transp.offset = 0;
    var->transp.length = 0;
    var->transp.msb_right = 0;
    var->nonstd = 0;
    var->activate = 0;
    var->height = -1;
    var->width = -1;
    var->vmode = FB_VMODE_NONINTERLACED;
    var->pixclock = 0;
    var->sync = 0;
    var->left_margin = 0;
    var->right_margin = 0;
    var->upper_margin = 0;
    var->lower_margin = 0;
    var->hsync_len = 0;
    var->vsync_len = 0;

    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 void hitfb_get_par(struct hitfb_par *par, const struct fb_info *info)
{
    *par = current_par;
}


static void hitfb_set_par(struct hitfb_par *par, const struct fb_info *info)
{
    /* Set the hardware according to 'par'. */
    current_par = *par;
    current_par_valid = 1;
}


static int hitfb_getcolreg(u_int regno, u_int *red, u_int *green, u_int *blue,
                         u_int *transp, struct fb_info *info)
{
    if (regno > 255)
	return 1;	

    outw(regno<<8, HD64461_CPTRAR);
    *red = inw(HD64461_CPTRDR)<<10;
    *green = inw(HD64461_CPTRDR)<<10;
    *blue = inw(HD64461_CPTRDR)<<10;
    *transp = 0;
    
    return 0;
}


static int hitfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
                         u_int transp, struct fb_info *info)
{
    if (regno > 255)
	return 1;
    
    outw(regno<<8, HD64461_CPTWAR);
    outw(red>>10, HD64461_CPTWDR);
    outw(green>>10, HD64461_CPTWDR);
    outw(blue>>10, HD64461_CPTWDR);
    
    if(regno<16) {
	switch(current_par.bpp) {
#ifdef FBCON_HAS_CFB16
	case 16:
	    fbcon_cmap.cfb16[regno] =
		((red   & 0xf800)      ) |
		((green & 0xfc00) >>  5) |
		((blue  & 0xf800) >> 11);
	    break;
#endif
	}
    }

    return 0;
}

static int hitfb_blank(int blank_mode, const struct fb_info *info)
{
    return 0;
}


static void hitfb_set_disp(const void *par, struct display *disp,
			   struct fb_info_gen *info)
{
    disp->screen_base = (void *)hit_videobase;
    switch(((struct hitfb_par *)par)->bpp) {
#ifdef FBCON_HAS_CFB8
    case 8:
	disp->dispsw = &fbcon_cfb8;
	break;
#endif
#ifdef FBCON_HAS_CFB16
    case 16:
	disp->dispsw = &fbcon_cfb16;
	disp->dispsw_data = fbcon_cmap.cfb16;
	break;
#endif
    default:
	disp->dispsw = &fbcon_dummy;
    }
}


struct fbgen_hwswitch hitfb_switch = {
    hitfb_detect,
    hitfb_encode_fix,
    hitfb_decode_var,
    hitfb_encode_var,
    hitfb_get_par,
    hitfb_set_par,
    hitfb_getcolreg,
    hitfb_setcolreg,
    NULL,
    hitfb_blank,
    hitfb_set_disp
};

static struct fb_ops hitfb_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,
};


int __init hitfb_init(void)
{
    strcpy(fb_info.gen.info.modename, "Hitachi HD64461");
    fb_info.gen.info.node = -1;
    fb_info.gen.info.flags = FBINFO_FLAG_DEFAULT;
    fb_info.gen.info.fbops = &hitfb_ops;
    fb_info.gen.info.disp = &disp;
    fb_info.gen.info.changevar = NULL;
    fb_info.gen.info.switch_con = &fbgen_switch;
    fb_info.gen.info.updatevar = &fbgen_update_var;
    fb_info.gen.info.blank = &fbgen_blank;
    fb_info.gen.parsize = sizeof(struct hitfb_par);
    fb_info.gen.fbhw = &hitfb_switch;
    fb_info.gen.fbhw->detect();
    
    fbgen_get_var(&disp.var, -1, &fb_info.gen.info);
    disp.var.activate = FB_ACTIVATE_NOW;
    fbgen_do_set_var(&disp.var, 1, &fb_info.gen);
    fbgen_set_disp(-1, &fb_info.gen);
    fbgen_install_cmap(0, &fb_info.gen);
    
    if(register_framebuffer(&fb_info.gen.info)<0) return -EINVAL;
    
    printk(KERN_INFO "fb%d: %s frame buffer device\n",
	   GET_FB_IDX(fb_info.gen.info.node), fb_info.gen.info.modename);
    
    return 0;
}


void hitfb_cleanup(struct fb_info *info)
{
    unregister_framebuffer(info);
}


#ifdef MODULE
int init_module(void)
{
    return hitfb_init();
}

void cleanup_module(void)
{
    hitfb_cleanup(void);
}
#endif