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/*
 * framebuffer driver for VBE 2.0 compliant graphic boards
 *
 * switching to graphics mode happens at boot time (while
 * running in real mode, see arch/i386/boot/video.S).
 *
 * (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>
 *
 */

#include <linuxcomp.h>

#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/ioport.h>
#include <linux/init.h>
#ifdef __i386__
#include <video/edid.h>
#endif
#include <asm/io.h>
#include <asm/mtrr.h>

#define dac_reg (0x3c8)
#define dac_val (0x3c9)

#include <vesa.h>

#define INIT_MODE 0x4101

/* --------------------------------------------------------------------- */

static struct fb_var_screeninfo vesafb_defined __initdata = {
        .activate       = FB_ACTIVATE_NOW,
        .height         = -1,
        .width          = -1,
        .right_margin   = 32,
        .upper_margin   = 16,
        .lower_margin   = 4,
        .vsync_len      = 4,
        .vmode          = FB_VMODE_NONINTERLACED,
};

static struct fb_fix_screeninfo vesafb_fix __initdata = {
        .id     = "VESA VGA",
        .type   = FB_TYPE_PACKED_PIXELS,
        .accel  = FB_ACCEL_NONE,
};

static struct fb_info fb_info;
static u32 pseudo_palette[17];

static int             inverse   = 0;
static int             mtrr      = 1;

static int             pmi_setpal = 0;  /* pmi for palette changes ??? */
static int             ypan       = 0;  /* 0..nothing, 1..ypan, 2..ywrap */
static unsigned short  *pmi_base  = 0;
static void            (*pmi_start)(void);
static void            (*pmi_pal)(void);

/* --------------------------------------------------------------------- */

static int vesafb_pan_display(struct fb_var_screeninfo *var,
                              struct fb_info *info)
{
#ifdef __i386__
        int offset;

        if (!ypan)
                return -EINVAL;
        if (var->xoffset)
                return -EINVAL;
        if (var->yoffset > var->yres_virtual)
                return -EINVAL;
        if ((ypan==1) && var->yoffset+var->yres > var->yres_virtual)
                return -EINVAL;

        offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;

        __asm__ __volatile__(
                "call *(%%edi)"
                : /* no return value */
                : "a" (0x4f07),         /* EAX */
                  "b" (0),              /* EBX */
                  "c" (offset),         /* ECX */
                  "d" (offset >> 16),   /* EDX */
                  "D" (&pmi_start));    /* EDI */
#endif
        return 0;
}

static void vesa_setpalette(int regno, unsigned red, unsigned green, unsigned blue)
{
#ifdef __i386__
        struct { u_char blue, green, red, pad; } entry;

        if (pmi_setpal) {
                entry.red   = red   >> 10;
                entry.green = green >> 10;
                entry.blue  = blue  >> 10;
                entry.pad   = 0;
                __asm__ __volatile__(
                "call *(%%esi)"
                : /* no return value */
                : "a" (0x4f09),         /* EAX */
                  "b" (0),              /* EBX */
                  "c" (1),              /* ECX */
                  "d" (regno),          /* EDX */
                  "D" (&entry),         /* EDI */
                  "S" (&pmi_pal));      /* ESI */
        } else {
                /* without protected mode interface, try VGA registers... */
                outb_p(regno,       dac_reg);
                outb_p(red   >> 10, dac_val);
                outb_p(green >> 10, dac_val);
                outb_p(blue  >> 10, dac_val);
        }
#endif
}

static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
                            unsigned blue, unsigned transp,
                            struct fb_info *info)
{
        /*
         *  Set a single color register. The values supplied are
         *  already rounded down to the hardware's capabilities
         *  (according to the entries in the `var' structure). Return
         *  != 0 for invalid regno.
         */
       
        if (regno >= info->cmap.len)
                return 1;

        switch (info->var.bits_per_pixel) {
        case 8:
                vesa_setpalette(regno,red,green,blue);
                break;
        case 16:
                if (info->var.red.offset == 10) {
                        /* 1:5:5:5 */
                        ((u32*) (info->pseudo_palette))[regno] =       
                                        ((red   & 0xf800) >>  1) |
                                        ((green & 0xf800) >>  6) |
                                        ((blue  & 0xf800) >> 11);
                } else {
                        /* 0:5:6:5 */
                        ((u32*) (info->pseudo_palette))[regno] =       
                                        ((red   & 0xf800)      ) |
                                        ((green & 0xfc00) >>  5) |
                                        ((blue  & 0xf800) >> 11);
                }
                break;
        case 24:
                red   >>= 8;
                green >>= 8;
                blue  >>= 8;
                ((u32 *)(info->pseudo_palette))[regno] =
                        (red   << info->var.red.offset)   |
                        (green << info->var.green.offset) |
                        (blue  << info->var.blue.offset);
                break;
        case 32:
                red   >>= 8;
                green >>= 8;
                blue  >>= 8;
                ((u32 *)(info->pseudo_palette))[regno] =
                        (red   << info->var.red.offset)   |
                        (green << info->var.green.offset) |
                        (blue  << info->var.blue.offset);
                break;
    }
    return 0;
}

static int vesafb_release(struct fb_info *info, int user)
{

        vbe_restore_vga();
        return 0;

}

int __init vesafb_setup(char *options)
{
        char *this_opt;
       
        if (!options || !*options)
                return 0;
       
        while ((this_opt = strsep(&options, ",")) != NULL) {
                if (!*this_opt) continue;
               
                if (! strcmp(this_opt, "inverse"))
                        inverse=1;
                else if (! strcmp(this_opt, "redraw"))
                        ypan=0;
                else if (! strcmp(this_opt, "ypan"))
                        ypan=1;
                else if (! strcmp(this_opt, "ywrap"))
                        ypan=2;
                else if (! strcmp(this_opt, "vgapal"))
                        pmi_setpal=0;
                else if (! strcmp(this_opt, "pmipal"))
                        pmi_setpal=1;
                else if (! strcmp(this_opt, "mtrr"))
                        mtrr=1;
                else if (! strcmp(this_opt, "nomtrr"))
                        mtrr=0;
        }
        return 0;
}

extern VbeInfoBlock VbeInfo;
extern int vbe_getifo(void);
extern void vm86_init(void);

static int vesafb_set_par(struct fb_info *info)
{
        ModeInfoBlock ModeInfo;
        int wx,wy,bpp,mode;
        int video_cmap_len;

        wx = info->var.xres;
        wy = info->var.yres;
        bpp = info->var.bits_per_pixel;
       
        mode = vbe_modenum(wx,wy,bpp);
        if (mode == -1) return -1;
       
        screen_info.lfb_base = vbe_getmodeinfo(&ModeInfo,mode);
       
        screen_info.orig_video_isVGA = VIDEO_TYPE_VLFB;

        if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
                return -ENXIO;

        screen_info.lfb_depth = ModeInfo.BitsPerPixel;
        screen_info.lfb_width = ModeInfo.XResolution;
        screen_info.lfb_height = ModeInfo.YResolution;
        screen_info.lfb_linelength = ModeInfo.BytesPerScanLine;
        screen_info.lfb_size = VbeInfo.TotalMemory;
        screen_info.pages = ModeInfo.NumberOfImagePages;

        screen_info.vesapm_seg = 0;
        screen_info.vesapm_off = 0;

        screen_info.red_pos = ModeInfo.RedFieldPosition;
        screen_info.red_size = ModeInfo.RedMaskSize;
        screen_info.green_pos = ModeInfo.GreenFieldPosition;
        screen_info.green_size = ModeInfo.GreenMaskSize;
        screen_info.blue_pos = ModeInfo.BlueFieldPosition;
        screen_info.blue_size = ModeInfo.BlueMaskSize;
        screen_info.rsvd_pos = ModeInfo.RsvdFieldPosition;
        screen_info.rsvd_size = ModeInfo.RsvdMaskSize;

        vbe_setmode(mode);

        info->fix.smem_start = screen_info.lfb_base;
        info->var.bits_per_pixel = screen_info.lfb_depth;
        if (15 == info->var.bits_per_pixel)
                info->var.bits_per_pixel = 16;
        info->var.xres = screen_info.lfb_width;
        info->var.yres = screen_info.lfb_height;
        info->fix.line_length = screen_info.lfb_linelength;
        info->fix.smem_len = screen_info.lfb_size;
        info->fix.visual   = (info->var.bits_per_pixel == 8) ?
                FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;

        /* limit framebuffer size to 16 MB.  Otherwise we'll eat tons of
         * kernel address space for nothing if the gfx card has alot of
         * memory (>= 128 MB isn't uncommon these days ...) */
        if (info->fix.smem_len > 16 * 1024 * 1024)
                info->fix.smem_len = 16 * 1024 * 1024;

        fb_info.screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);

        /* some dummy values for timing to make fbset happy */
        info->var.pixclock     = 10000000 / info->var.xres * 1000 / info->var.yres;
        info->var.left_margin  = (info->var.xres / 8) & 0xf8;
        info->var.hsync_len    = (info->var.xres / 8) & 0xf8;
       
        if (info->var.bits_per_pixel > 8) {
                info->var.red.offset    = screen_info.red_pos;
                info->var.red.length    = screen_info.red_size;
                info->var.green.offset  = screen_info.green_pos;
                info->var.green.length  = screen_info.green_size;
                info->var.blue.offset   = screen_info.blue_pos;
                info->var.blue.length   = screen_info.blue_size;
                info->var.transp.offset = screen_info.rsvd_pos;
                info->var.transp.length = screen_info.rsvd_size;
                video_cmap_len = 16;
        } else {
                info->var.red.length   = 6;
                info->var.green.length = 6;
                info->var.blue.length  = 6;
                video_cmap_len = 256;
        }

        info->fix.ypanstep  = ypan     ? 1 : 0;
        info->fix.ywrapstep = (ypan>1) ? 1 : 0;
       
        return 0;

}

static int vesafb_check_var(struct fb_var_screeninfo *var,
                             struct fb_info *info)
{

        return 0;

}

static struct fb_ops vesafb_ops = {
        .owner          = THIS_MODULE,
        .fb_setcolreg   = vesafb_setcolreg,
        .fb_pan_display = vesafb_pan_display,
        .fb_set_par     = vesafb_set_par,
        .fb_check_var   = vesafb_check_var,
        .fb_fillrect    = cfb_fillrect,
        .fb_copyarea    = cfb_copyarea,
        .fb_imageblit   = cfb_imageblit,
        .fb_cursor      = soft_cursor,
        .fb_release     = vesafb_release,
};


int __init vesafb_init(void)
{
        ModeInfoBlock ModeInfo;
        int video_cmap_len;
        int i;

        vm86_init();

        if (vbe_getinfo())
                return -EIO;

        printk(KERN_INFO "VBE Extension Found.\n");

        screen_info.lfb_base = vbe_getmodeinfo(&ModeInfo,INIT_MODE);

        screen_info.orig_video_isVGA = VIDEO_TYPE_VLFB;

        if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
                return -ENXIO;

        screen_info.lfb_depth = ModeInfo.BitsPerPixel;
        screen_info.lfb_width = ModeInfo.XResolution;
        screen_info.lfb_height = ModeInfo.YResolution;
        screen_info.lfb_linelength = ModeInfo.BytesPerScanLine;
        screen_info.lfb_size = VbeInfo.TotalMemory;
        screen_info.pages = ModeInfo.NumberOfImagePages;

        screen_info.vesapm_seg = 0;
        screen_info.vesapm_off = 0;

        screen_info.red_pos = ModeInfo.RedFieldPosition;
        screen_info.red_size = ModeInfo.RedMaskSize;
        screen_info.green_pos = ModeInfo.GreenFieldPosition;
        screen_info.green_size = ModeInfo.GreenMaskSize;
        screen_info.blue_pos = ModeInfo.BlueFieldPosition;
        screen_info.blue_size = ModeInfo.BlueMaskSize;
        screen_info.rsvd_pos = ModeInfo.RsvdFieldPosition;
        screen_info.rsvd_size = ModeInfo.RsvdMaskSize;

        vbe_setmode(INIT_MODE);

        vesafb_fix.smem_start = screen_info.lfb_base;
        vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
        if (15 == vesafb_defined.bits_per_pixel)
                vesafb_defined.bits_per_pixel = 16;
        vesafb_defined.xres = screen_info.lfb_width;
        vesafb_defined.yres = screen_info.lfb_height;
        vesafb_fix.line_length = screen_info.lfb_linelength;
        vesafb_fix.smem_len = screen_info.lfb_size;
        vesafb_fix.visual   = (vesafb_defined.bits_per_pixel == 8) ?
                FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;

        /* limit framebuffer size to 16 MB.  Otherwise we'll eat tons of
         * kernel address space for nothing if the gfx card has alot of
         * memory (>= 128 MB isn't uncommon these days ...) */
        if (vesafb_fix.smem_len > 16 * 1024 * 1024)
                vesafb_fix.smem_len = 16 * 1024 * 1024;

#ifndef __i386__
        screen_info.vesapm_seg = 0;
#endif

        if (!request_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len, "vesafb")) {
                printk(KERN_WARNING
                       "vesafb: abort, cannot reserve video memory at 0x%lx\n",
                        vesafb_fix.smem_start);
                /* We cannot make this fatal. Sometimes this comes from magic
                   spaces our resource handlers simply don't know about */
        }

        fb_info.screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
        if (!fb_info.screen_base) {
                release_mem_region(vesafb_fix.smem_start, vesafb_fix.smem_len);
                printk(KERN_ERR
                       "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
                        vesafb_fix.smem_len, vesafb_fix.smem_start);
                return -EIO;
        }

        printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, size %dk\n",
               vesafb_fix.smem_start, fb_info.screen_base, vesafb_fix.smem_len/1024);
        printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
               vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);

        if (screen_info.vesapm_seg) {
                printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
                       screen_info.vesapm_seg,screen_info.vesapm_off);
        }

        if (screen_info.vesapm_seg < 0xc000)
                ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */

        if (ypan || pmi_setpal) {
                pmi_base  = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
                pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
                pmi_pal   = (void*)((char*)pmi_base + pmi_base[2]);
                printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
                if (pmi_base[3]) {
                        printk(KERN_INFO "vesafb: pmi: ports = ");
                                for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
                                        printk("%x ",pmi_base[i]);
                        printk("\n");

                        if (pmi_base[i] != 0xffff) {
                                /*
                                 * memory areas not supported (yet?)
                                 *
                                 * Rules are: we have to set up a descriptor for the requested
                                 * memory area and pass it in the ES register to the BIOS function.
                                 */
                                printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
                                ypan = pmi_setpal = 0;
                        }
                }
        }

        vesafb_defined.xres_virtual = vesafb_defined.xres;
        vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
        if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
                printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
                       (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
        } else {
                printk(KERN_INFO "vesafb: scrolling: redraw\n");
                vesafb_defined.yres_virtual = vesafb_defined.yres;
                ypan = 0;
        }

        /* some dummy values for timing to make fbset happy */
        vesafb_defined.pixclock     = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
        vesafb_defined.left_margin  = (vesafb_defined.xres / 8) & 0xf8;
        vesafb_defined.hsync_len    = (vesafb_defined.xres / 8) & 0xf8;
       
        if (vesafb_defined.bits_per_pixel > 8) {
                vesafb_defined.red.offset    = screen_info.red_pos;
                vesafb_defined.red.length    = screen_info.red_size;
                vesafb_defined.green.offset  = screen_info.green_pos;
                vesafb_defined.green.length  = screen_info.green_size;
                vesafb_defined.blue.offset   = screen_info.blue_pos;
                vesafb_defined.blue.length   = screen_info.blue_size;
                vesafb_defined.transp.offset = screen_info.rsvd_pos;
                vesafb_defined.transp.length = screen_info.rsvd_size;
                printk(KERN_INFO "vesafb: directcolor: "
                       "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
                       screen_info.rsvd_size,
                       screen_info.red_size,
                       screen_info.green_size,
                       screen_info.blue_size,
                       screen_info.rsvd_pos,
                       screen_info.red_pos,
                       screen_info.green_pos,
                       screen_info.blue_pos);
                video_cmap_len = 16;
        } else {
                vesafb_defined.red.length   = 6;
                vesafb_defined.green.length = 6;
                vesafb_defined.blue.length  = 6;
                video_cmap_len = 256;
        }

        vesafb_fix.ypanstep  = ypan     ? 1 : 0;
        vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;

        /* request failure does not faze us, as vgacon probably has this
         * region already (FIXME) */
        request_region(0x3c0, 32, "vesafb");

        if (mtrr) {
                int temp_size = vesafb_fix.smem_len;
                /* Find the largest power-of-two */
                while (temp_size & (temp_size - 1))
                        temp_size &= (temp_size - 1);

                /* Try and find a power of two to add */
                while (temp_size && mtrr_add(vesafb_fix.smem_start, temp_size, MTRR_TYPE_WRCOMB, 1)==-EINVAL) {
                        temp_size >>= 1;
                }
        }
       
        fb_info.fbops = &vesafb_ops;
        fb_info.var = vesafb_defined;
        fb_info.fix = vesafb_fix;
        fb_info.pseudo_palette = pseudo_palette;
        fb_info.flags = FBINFO_FLAG_DEFAULT;

        fb_alloc_cmap(&fb_info.cmap, video_cmap_len, 0);

        if (register_framebuffer(&fb_info)<0)
                return -EINVAL;

        printk(KERN_INFO "fb%d: %s frame buffer device\n",
               fb_info.node, fb_info.fix.id);
        return 0;
}

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-basic-offset: 8
 * End:
 */

MODULE_LICENSE("GPL");