/*-*- linux-c -*-
 *  linux/drivers/video/i810_main.h -- Intel 810 Non-discrete Video Timings 
 *                                     (VESA GTF)
 *
 *      Copyright (C) 2001 Antonino Daplas<adaplas@pol.net>
 *      All Rights Reserved      
 *
 *
 *  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/kernel.h>

#include "i810_regs.h"
#include "i810.h"
#include "i810_main.h"

/*
 * FIFO and Watermark tables - based almost wholly on i810_wmark.c in 
 * XFree86 v4.03 by Precision Insight.  Slightly modified for integer 
 * operation, instead of float
 */

struct wm_info {
   u32 freq;
   u32  wm;
};

static struct wm_info i810_wm_8_100[] = {
        { 15, 0x0070c000 },  { 19, 0x0070c000 },  { 25, 0x22003000 },
        { 28, 0x22003000 },  { 31, 0x22003000 },  { 36, 0x22007000 },
        { 40, 0x22007000 },  { 45, 0x22007000 },  { 49, 0x22008000 },
        { 50, 0x22008000 },  { 56, 0x22008000 },  { 65, 0x22008000 },
        { 75, 0x22008000 },  { 78, 0x22008000 },  { 80, 0x22008000 },
        { 94, 0x22008000 },  { 96, 0x22107000 },  { 99, 0x22107000 },
        { 108, 0x22107000 }, { 121, 0x22107000 }, { 128, 0x22107000 },
        { 132, 0x22109000 }, { 135, 0x22109000 }, { 157, 0x2210b000 },
        { 162, 0x2210b000 }, { 175, 0x2210b000 }, { 189, 0x2220e000 },
        { 195, 0x2220e000 }, { 202, 0x2220e000 }, { 204, 0x2220e000 },
        { 218, 0x2220f000 }, { 229, 0x22210000 }, { 234, 0x22210000 }, 
};

static struct wm_info i810_wm_16_100[] = {
        { 15, 0x0070c000 },  { 19, 0x0020c000 },  { 25, 0x22006000 },
        { 28, 0x22006000 },  { 31, 0x22007000 },  { 36, 0x22007000 },
        { 40, 0x22007000 },  { 45, 0x22007000 },  { 49, 0x22009000 },
        { 50, 0x22009000 },  { 56, 0x22108000 },  { 65, 0x2210e000 },
        { 75, 0x2210e000 },  { 78, 0x2210e000 },  { 80, 0x22210000 },
        { 94, 0x22210000 },  { 96, 0x22210000 },  { 99, 0x22210000 },
        { 108, 0x22210000 }, { 121, 0x22210000 }, { 128, 0x22210000 },
        { 132, 0x22314000 }, { 135, 0x22314000 }, { 157, 0x22415000 },
        { 162, 0x22416000 }, { 175, 0x22416000 }, { 189, 0x22416000 },
        { 195, 0x22416000 }, { 202, 0x22416000 }, { 204, 0x22416000 },
        { 218, 0x22416000 }, { 229, 0x22416000 },
};

static struct wm_info i810_wm_24_100[] = {
        { 15, 0x0020c000 },  { 19, 0x0040c000 },  { 25, 0x22009000 },
        { 28, 0x22009000 },  { 31, 0x2200a000 },  { 36, 0x2210c000 },
        { 40, 0x2210c000 },  { 45, 0x2210c000 },  { 49, 0x22111000 },
        { 50, 0x22111000 },  { 56, 0x22111000 },  { 65, 0x22214000 },
        { 75, 0x22214000 },  { 78, 0x22215000 },  { 80, 0x22216000 },
        { 94, 0x22218000 },  { 96, 0x22418000 },  { 99, 0x22418000 },
        { 108, 0x22418000 }, { 121, 0x22418000 }, { 128, 0x22419000 },
        { 132, 0x22519000 }, { 135, 0x4441d000 }, { 157, 0x44419000 },
        { 162, 0x44419000 }, { 175, 0x44419000 }, { 189, 0x44419000 },
        { 195, 0x44419000 }, { 202, 0x44419000 }, { 204, 0x44419000 },
};

static struct wm_info i810_wm_8_133[] = {
        { 15, 0x0070c000 },  { 19, 0x0070c000 },  { 25, 0x22003000 },
        { 28, 0x22003000 },  { 31, 0x22003000 },  { 36, 0x22007000 },
        { 40, 0x22007000 },  { 45, 0x22007000 },  { 49, 0x22008000 },
        { 50, 0x22008000 },  { 56, 0x22008000 },  { 65, 0x22008000 },
        { 75, 0x22008000 },  { 78, 0x22008000 },  { 80, 0x22008000 },
        { 94, 0x22008000 },  { 96, 0x22107000 },  { 99, 0x22107000 },
        { 108, 0x22107000 }, { 121, 0x22107000 }, { 128, 0x22107000 },
        { 132, 0x22109000 }, { 135, 0x22109000 }, { 157, 0x2210b000 },
        { 162, 0x2210b000 }, { 175, 0x2210b000 }, { 189, 0x2220e000 },
        { 195, 0x2220e000 }, { 202, 0x2220e000 }, { 204, 0x2220e000 },
        { 218, 0x2220f000 }, { 229, 0x22210000 }, { 234, 0x22210000 }, 
};

static struct wm_info i810_wm_16_133[] = {
        { 15, 0x0020c000 },  { 19, 0x0020c000 },  { 25, 0x22006000 },
        { 28, 0x22006000 },  { 31, 0x22007000 },  { 36, 0x22007000 },
        { 40, 0x22007000 },  { 45, 0x22007000 },  { 49, 0x22009000 },
        { 50, 0x22009000 },  { 56, 0x22108000 },  { 65, 0x2210e000 },
        { 75, 0x2210e000 },  { 78, 0x2210e000 },  { 80, 0x22210000 },
        { 94, 0x22210000 },  { 96, 0x22210000 },  { 99, 0x22210000 },
        { 108, 0x22210000 }, { 121, 0x22210000 }, { 128, 0x22210000 },
        { 132, 0x22314000 }, { 135, 0x22314000 }, { 157, 0x22415000 },
        { 162, 0x22416000 }, { 175, 0x22416000 }, { 189, 0x22416000 },
        { 195, 0x22416000 }, { 202, 0x22416000 }, { 204, 0x22416000 },
        { 218, 0x22416000 }, { 229, 0x22416000 },
};

static struct wm_info i810_wm_24_133[] = {
        { 15, 0x0020c000 },  { 19, 0x00408000 },  { 25, 0x22009000 },
        { 28, 0x22009000 },  { 31, 0x2200a000 },  { 36, 0x2210c000 },
        { 40, 0x2210c000 },  { 45, 0x2210c000 },  { 49, 0x22111000 },
        { 50, 0x22111000 },  { 56, 0x22111000 },  { 65, 0x22214000 },
        { 75, 0x22214000 },  { 78, 0x22215000 },  { 80, 0x22216000 },
        { 94, 0x22218000 },  { 96, 0x22418000 },  { 99, 0x22418000 },
        { 108, 0x22418000 }, { 121, 0x22418000 }, { 128, 0x22419000 },
        { 132, 0x22519000 }, { 135, 0x4441d000 }, { 157, 0x44419000 },
        { 162, 0x44419000 }, { 175, 0x44419000 }, { 189, 0x44419000 },
        { 195, 0x44419000 }, { 202, 0x44419000 }, { 204, 0x44419000 },
};

void round_off_xres(u32 *xres) { }
void round_off_yres(u32 *xres, u32 *yres) { }

/**
 * i810fb_encode_registers - encode @var to hardware register values
 * @var: pointer to var structure
 * @par: pointer to hardware par structure
 * 
 * DESCRIPTION: 
 * Timing values in @var will be converted to appropriate
 * register values of @par.  
 */
void i810fb_encode_registers(const struct fb_var_screeninfo *var,
                             struct i810fb_par *par, u32 xres, u32 yres)
{
        int n, blank_s, blank_e;
        u8 __iomem *mmio = par->mmio_start_virtual;
        u8 msr = 0;

        /* Horizontal */
        /* htotal */
        n = ((xres + var->right_margin + var->hsync_len + 
              var->left_margin) >> 3) - 5;
        par->regs.cr00 =  (u8) n;
        par->regs.cr35 = (u8) ((n >> 8) & 1);
        
        /* xres */
        par->regs.cr01 = (u8) ((xres >> 3) - 1);

        /* hblank */
        blank_e = (xres + var->right_margin + var->hsync_len + 
                   var->left_margin) >> 3;
        blank_e--;
        blank_s = blank_e - 127;
        if (blank_s < (xres >> 3))
                blank_s = xres >> 3;
        par->regs.cr02 = (u8) blank_s;
        par->regs.cr03 = (u8) (blank_e & 0x1F);
        par->regs.cr05 = (u8) ((blank_e & (1 << 5)) << 2);
        par->regs.cr39 = (u8) ((blank_e >> 6) & 1);

        /* hsync */
        par->regs.cr04 = (u8) ((xres + var->right_margin) >> 3);
        par->regs.cr05 |= (u8) (((xres + var->right_margin + 
                                  var->hsync_len) >> 3) & 0x1F);
        
        /* Vertical */
        /* vtotal */
        n = yres + var->lower_margin + var->vsync_len + var->upper_margin - 2;
        par->regs.cr06 = (u8) (n & 0xFF);
        par->regs.cr30 = (u8) ((n >> 8) & 0x0F);

        /* vsync */ 
        n = yres + var->lower_margin;
        par->regs.cr10 = (u8) (n & 0xFF);
        par->regs.cr32 = (u8) ((n >> 8) & 0x0F);
        par->regs.cr11 = i810_readb(CR11, mmio) & ~0x0F;
        par->regs.cr11 |= (u8) ((yres + var->lower_margin + 
                                 var->vsync_len) & 0x0F);

        /* yres */
        n = yres - 1;
        par->regs.cr12 = (u8) (n & 0xFF);
        par->regs.cr31 = (u8) ((n >> 8) & 0x0F);
        
        /* vblank */
        blank_e = yres + var->lower_margin + var->vsync_len + 
                var->upper_margin;
        blank_e--;
        blank_s = blank_e - 127;
        if (blank_s < yres)
                blank_s = yres;
        par->regs.cr15 = (u8) (blank_s & 0xFF);
        par->regs.cr33 = (u8) ((blank_s >> 8) & 0x0F);
        par->regs.cr16 = (u8) (blank_e & 0xFF);
        par->regs.cr09 = 0;     

        /* sync polarity */
        if (!(var->sync & FB_SYNC_HOR_HIGH_ACT))
                msr |= 1 << 6;
        if (!(var->sync & FB_SYNC_VERT_HIGH_ACT))
                msr |= 1 << 7;
        par->regs.msr = msr;

        /* interlace */
        if (var->vmode & FB_VMODE_INTERLACED) 
                par->interlace = (1 << 7) | ((u8) (var->yres >> 4));
        else 
                par->interlace = 0;

        if (var->vmode & FB_VMODE_DOUBLE)
                par->regs.cr09 |= 1 << 7;

        /* overlay */
        par->ovract = ((var->xres + var->right_margin + var->hsync_len + 
                        var->left_margin - 32) | ((var->xres - 32) << 16));
}       

void i810fb_fill_var_timings(struct fb_var_screeninfo *var) { }

/**
 * i810_get_watermark - gets watermark
 * @var: pointer to fb_var_screeninfo
 * @par: pointer to i810fb_par structure
 *
 * DESCRIPTION:
 * Gets the required watermark based on 
 * pixelclock and RAMBUS frequency.
 * 
 * RETURNS:
 * watermark
 */
u32 i810_get_watermark(const struct fb_var_screeninfo *var,
                       struct i810fb_par *par)
{
        struct wm_info *wmark = NULL;
        u32 i, size = 0, pixclock, wm_best = 0, min, diff;

        if (par->mem_freq == 100) {
                switch (var->bits_per_pixel) { 
                case 8:
                        wmark = i810_wm_8_100;
                        size = ARRAY_SIZE(i810_wm_8_100);
                        break;
                case 16:
                        wmark = i810_wm_16_100;
                        size = ARRAY_SIZE(i810_wm_16_100);
                        break;
                case 24:
                case 32:
                        wmark = i810_wm_24_100;
                        size = ARRAY_SIZE(i810_wm_24_100);
                }
        } else {
                switch(var->bits_per_pixel) {
                case 8:
                        wmark = i810_wm_8_133;
                        size = ARRAY_SIZE(i810_wm_8_133);
                        break;
                case 16:
                        wmark = i810_wm_16_133;
                        size = ARRAY_SIZE(i810_wm_16_133);
                        break;
                case 24:
                case 32:
                        wmark = i810_wm_24_133;
                        size = ARRAY_SIZE(i810_wm_24_133);
                }
        }

        pixclock = 1000000/var->pixclock;
        min = ~0;
        for (i = 0; i < size; i++) {
                if (pixclock <= wmark[i].freq) 
                        diff = wmark[i].freq - pixclock;
                else 
                        diff = pixclock - wmark[i].freq;
                if (diff < min) {
                        wm_best = wmark[i].wm;
                        min = diff;
                }
        }
        return wm_best;         
}