/*-*- linux-c -*-
 *  linux/drivers/video/i810_dvt.c -- Intel 810 Discrete Video Timings (Intel)
 *
 *      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"

struct mode_registers std_modes[] = {
        /* 640x480 @ 60Hz */
        { 25000, 0x0013, 0x0003, 0x40, 0x5F, 0x4F, 0x50, 0x82, 0x51, 0x9D,
          0x0B, 0x10, 0x40, 0xE9, 0x0B, 0xDF, 0x50, 0xE7, 0x04, 0x02,
          0x01, 0x01, 0x01, 0x00, 0x01, 0x22002000, 0x22004000, 0x22006000,
          0x22002000, 0x22004000, 0x22006000, 0xC0 }, 
          
        /* 640x480 @ 70Hz */
        { 28000, 0x0053, 0x0010, 0x40, 0x61, 0x4F, 0x4F, 0x85, 0x52, 0x9A,
          0xF2, 0x10, 0x40, 0xE0, 0x03, 0xDF, 0x50, 0xDF, 0xF3, 0x01, 
          0x01, 0x01, 0x01, 0x00, 0x01, 0x22002000, 0x22004000, 0x22005000,
          0x22002000, 0x22004000, 0x22005000, 0xC0 },
          
        /* 640x480 @ 72Hz */
        { 31000, 0x0013, 0x0002, 0x40, 0x63, 0x4F, 0x4F, 0x87, 0x52, 0x97,
          0x06, 0x0F, 0x40, 0xE8, 0x0B, 0xDF, 0x50, 0xDF, 0x07, 0x02, 
          0x01, 0x01, 0x01, 0x00, 0x01, 0x22003000, 0x22005000, 0x22007000,
          0x22003000, 0x22005000, 0x22007000, 0xC0 },
          
        /* 640x480 @ 75Hz */
        { 31000, 0x0013, 0x0002, 0x40, 0x64, 0x4F, 0x4F, 0x88, 0x51, 0x99, 
          0xF2, 0x10, 0x40, 0xE0, 0x03, 0xDF, 0x50, 0xDF, 0xF3, 0x01, 
          0x01, 0x01, 0x01, 0x00, 0x01, 0x22003000, 0x22005000, 0x22007000, 
          0x22003000, 0x22005000, 0x22007000, 0xC0 },
          
        /* 640x480 @ 85Hz */
        { 36000, 0x0010, 0x0001, 0x40, 0x63, 0x4F, 0x4F, 0x87, 0x56, 0x9D,
          0xFB, 0x10, 0x40, 0xE0, 0x03, 0xDF, 0x50, 0xDF, 0xFC, 0x01,
          0x01, 0x01, 0x01, 0x00, 0x01, 0x22003000, 0x22005000, 0x22107000,
          0x22003000, 0x22005000, 0x22107000, 0xC0 },
          
        /* 800x600 @ 56Hz */
        { 36000, 0x0010, 0x0001, 0x40, 0x7B, 0x63, 0x63, 0x9F, 0x66, 0x8F,
          0x6F, 0x10, 0x40, 0x58, 0x0A, 0x57, 0xC8, 0x57, 0x70, 0x02, 
          0x02, 0x02, 0x02, 0x00, 0x01, 0x22003000, 0x22005000, 0x22107000,
          0x22003000, 0x22005000, 0x22107000, 0x00 },
          
        /* 800x600 @ 60Hz */
        { 40000, 0x0008, 0x0001, 0x30, 0x7F, 0x63, 0x63, 0x83, 0x68, 0x18, 
          0x72, 0x10, 0x40, 0x58, 0x0C, 0x57, 0xC8, 0x57, 0x73, 0x02,
          0x02, 0x02, 0x02, 0x00, 0x00, 0x22003000, 0x22006000, 0x22108000,
          0x22003000, 0x22006000, 0x22108000, 0x00 },
          
        /* 800x600 @ 70Hz */
        { 45000, 0x0054, 0x0015, 0x30, 0x7D, 0x63, 0x63, 0x81, 0x68, 0x12,
          0x6f, 0x10, 0x40, 0x58, 0x0b, 0x57, 0x64, 0x57, 0x70, 0x02, 
          0x02, 0x02, 0x02, 0x00, 0x00, 0x22004000, 0x22007000, 0x2210A000, 
          0x22004000, 0x22007000, 0x2210A000, 0x00 },
          
        /* 800x600 @ 72Hz */
        { 50000, 0x0017, 0x0004, 0x30, 0x7D, 0x63, 0x63, 0x81, 0x6A, 0x19,
          0x98, 0x10, 0x40, 0x7C, 0x02, 0x57, 0xC8, 0x57, 0x99, 0x02, 
          0x02, 0x02, 0x02, 0x00, 0x00, 0x22004000, 0x22007000, 0x2210A000,
          0x22004000, 0x22007000, 0x2210A000, 0x00 }, 
          
        /* 800x600 @ 75Hz */
        { 49000, 0x001F, 0x0006, 0x30, 0x7F, 0x63, 0x63, 0x83, 0x65, 0x0F,
          0x6F, 0x10, 0x40, 0x58, 0x0B, 0x57, 0xC8, 0x57, 0x70, 0x02, 
          0x02, 0x02, 0x02, 0x00, 0x00, 0x22004000, 0x22007000, 0x2210B000,
          0x22004000, 0x22007000, 0x2210B000, 0x00 },
          
        /* 800x600 @ 85Hz */
        { 56000, 0x0049, 0x000E, 0x30, 0x7E, 0x63, 0x63, 0x82, 0x67, 0x0F,
          0x75, 0x10, 0x40, 0x58, 0x0B, 0x57, 0xC8, 0x57, 0x76, 0x02,
          0x02, 0x02, 0x02, 0x00, 0x00, 0x22004000, 0x22108000, 0x2210b000, 
          0x22004000, 0x22108000, 0x2210b000, 0x00 },
          
        /* 1024x768 @ 60Hz */
        { 65000, 0x003F, 0x000A, 0x30, 0xA3, 0x7F, 0x7F, 0x87, 0x83, 0x94,
          0x24, 0x10, 0x40, 0x02, 0x08, 0xFF, 0x80, 0xFF, 0x25, 0x03,
          0x02, 0x03, 0x02, 0x00, 0x00, 0x22005000, 0x22109000, 0x2220D000,
          0x22005000, 0x22109000, 0x2220D000, 0xC0 },
          
        /* 1024x768 @ 70Hz */
        { 75000, 0x0017, 0x0002, 0x30, 0xA1, 0x7F, 0x7F, 0x85, 0x82, 0x93,
          0x24, 0x10, 0x40, 0x02, 0x08, 0xFF, 0x80, 0xFF, 0x25, 0x03,
          0x02, 0x03, 0x02, 0x00, 0x00, 0x22005000, 0x2210A000, 0x2220F000,
          0x22005000, 0x2210A000, 0x2220F000, 0xC0 }, 
          
        /* 1024x768 @ 75Hz */          
        { 78000, 0x0050, 0x0017, 0x20, 0x9F, 0x7F, 0x7F, 0x83, 0x81, 0x8D,
          0x1E, 0x10, 0x40, 0x00, 0x03, 0xFF, 0x80, 0xFF, 0x1F, 0x03,
          0x02, 0x03, 0x02, 0x00, 0x00, 0x22006000, 0x2210B000, 0x22210000,
          0x22006000, 0x2210B000, 0x22210000, 0x00 },
          
        /* 1024x768 @ 85Hz */
        { 94000, 0x003D, 0x000E, 0x20, 0xA7, 0x7F, 0x7F, 0x8B, 0x85, 0x91,
          0x26, 0x10, 0x40, 0x00, 0x03, 0xFF, 0x80, 0xFF, 0x27, 0x03,
          0x02, 0x03, 0x02, 0x00, 0x00, 0x22007000, 0x2220E000, 0x22212000,
          0x22007000, 0x2220E000, 0x22212000, 0x00 },
          
        /* 1152x864 @ 60Hz */ 
        { 80000, 0x0008, 0x0001, 0x20, 0xB3, 0x8F, 0x8F, 0x97, 0x93, 0x9f,
          0x87, 0x10, 0x40, 0x60, 0x03, 0x5F, 0x90, 0x5f, 0x88, 0x03,
          0x03, 0x03, 0x03, 0x00, 0x00, 0x2220C000, 0x22210000, 0x22415000,   
          0x2220C000, 0x22210000, 0x22415000, 0x00 },
          
        /* 1152x864 @ 70Hz */
        { 96000, 0x000a, 0x0001, 0x20, 0xbb, 0x8F, 0x8F, 0x9f, 0x98, 0x87, 
          0x82, 0x10, 0x40, 0x60, 0x03, 0x5F, 0x90, 0x5F, 0x83, 0x03,
          0x03, 0x03, 0x03, 0x00, 0x00, 0x22107000, 0x22210000, 0x22415000,
          0x22107000, 0x22210000, 0x22415000, 0x00 },
          
        /* 1152x864 @ 72Hz */
        { 99000, 0x001f, 0x0006, 0x20, 0xbb, 0x8F, 0x8F, 0x9f, 0x98, 0x87,
          0x83, 0x10, 0x40, 0x60, 0x03, 0x5F, 0x90, 0x5F, 0x84, 0x03,
          0x03, 0x03, 0x03, 0x00, 0x00, 0x22107000, 0x22210000, 0x22415000,
          0x22107000, 0x22210000, 0x22415000, 0x00 },
          
        /* 1152x864 @ 75Hz */
        { 108000, 0x0010, 0x0002, 0x20, 0xC3, 0x8F, 0x8F, 0x87, 0x97, 0x07,
          0x82, 0x10, 0x40, 0x60, 0x03, 0x5F, 0x90, 0x5F, 0x83, 0x03, 
          0x03, 0x03, 0x03, 0x00, 0x01, 0x22107000, 0x22210000, 0x22415000,
          0x22107000, 0x22210000, 0x22415000, 0x00 },
          
        /* 1152x864 @ 85Hz */
        { 121000, 0x006D, 0x0014, 0x20, 0xc0, 0x8F, 0x8F, 0x84, 0x97, 0x07,
          0x93, 0x10, 0x40, 0x60, 0x03, 0x5F, 0x90, 0x5F, 0x94, 0x03, 
          0x03, 0x03, 0x03, 0x00, 0x01, 0x2220C000, 0x22210000, 0x22415000,
          0x2220C000, 0x22210000, 0x22415000, 0x0 },
          
        /* 1280x960 @ 60Hz */
        { 108000, 0x0010, 0x0002, 0x20, 0xDC, 0x9F, 0x9F, 0x80, 0xAB, 0x99,
          0xE6, 0x10, 0x40, 0xC0, 0x03, 0xBF, 0xA0, 0xBF, 0xE7, 0x03,
          0x03, 0x03, 0x03, 0x00, 0x01, 0x2210A000, 0x22210000, 0x22415000,
          0x2210A000, 0x22210000, 0x22415000, 0x00 },
          
        /* 1280x960 @ 75Hz */
        { 129000, 0x0029, 0x0006, 0x20, 0xD3, 0x9F, 0x9F, 0x97, 0xaa, 0x1b,
          0xE8, 0x10, 0x40, 0xC0, 0x03, 0xBF, 0xA0, 0xBF, 0xE9, 0x03,
          0x03, 0x03, 0x03, 0x00, 0x01, 0x2210A000, 0x22210000, 0x2241B000,
          0x2210A000, 0x22210000, 0x2241B000, 0x00 },
          
        /* 1280x960 @ 85Hz */
        { 148000, 0x0042, 0x0009, 0x20, 0xD3, 0x9F, 0x9F, 0x97, 0xA7, 0x1B,
          0xF1, 0x10, 0x40, 0xC0, 0x03, 0xBF, 0xA0, 0xBF, 0xF2, 0x03,
          0x03, 0x03, 0x03, 0x00, 0x01, 0x2210A000, 0x22220000, 0x2241D000,       
          0x2210A000, 0x22220000, 0x2241D000, 0x00 },
          
        /* 1600x1200 @ 60Hz */
        { 162000, 0x0019, 0x0006, 0x10, 0x09, 0xC7, 0xC7, 0x8D, 0xcf, 0x07,
          0xE0, 0x10, 0x40, 0xB0, 0x03, 0xAF, 0xC8, 0xAF, 0xE1, 0x04, 
          0x04, 0x04, 0x04, 0x01, 0x00, 0x2210b000, 0x22416000, 0x44419000,
          0x2210b000, 0x22416000, 0x44419000, 0x00 },
          
        /* 1600x1200 @ 65 Hz */
        { 175000, 0x005d, 0x0018, 0x10, 0x09, 0xC7, 0xC7, 0x8D, 0xcf, 0x07,
          0xE0, 0x10, 0x40, 0xB0, 0x03, 0xAF, 0xC8, 0xAF, 0xE1, 0x04, 
          0x04, 0x04, 0x04, 0x01, 0x00, 0x2210c000, 0x22416000, 0x44419000,
          0x2210c000, 0x22416000, 0x44419000, 0x00 },
          
        /* 1600x1200 @ 70 Hz */
        { 189000, 0x003D, 0x000e, 0x10, 0x09, 0xC7, 0xC7, 0x8d, 0xcf, 0x07,
          0xE0, 0x10, 0x40, 0xb0, 0x03, 0xAF, 0xC8, 0xaf, 0xE1, 0x04, 
          0x04, 0x04, 0x04, 0x01, 0x00, 0x2220e000, 0x22416000, 0x44419000,
          0x2220e000, 0x22416000, 0x44419000, 0x00 },
          
        /* 1600x1200 @ 72 Hz */
        { 195000, 0x003f, 0x000e, 0x10, 0x0b, 0xC7, 0xC7, 0x8f, 0xd5, 0x0b,
          0xE1, 0x10, 0x40, 0xb0, 0x03, 0xAF, 0xC8, 0xaf, 0xe2, 0x04, 0x04,
          0x04, 0x04, 0x01, 0x00, 0x2220e000, 0x22416000, 0x44419000,
          0x2220e000, 0x22416000, 0x44419000, 0x00 }, 
          
        /* 1600x1200 @ 75 Hz */
        { 202000, 0x0024, 0x0007, 0x10, 0x09, 0xC7, 0xC7, 0x8d, 0xcf, 0x07,
          0xE0, 0x10, 0x40, 0xb0, 0x03, 0xAF, 0xC8, 0xaf, 0xE1, 0x04, 0x04,
          0x04, 0x04, 0x01, 0x00, 0x2220e000, 0x22416000, 0x44419000,      
          0x2220e000, 0x22416000, 0x44419000,  0x00 },
          
        /* 1600x1200 @ 85 Hz */
        { 229000, 0x0029, 0x0007, 0x10, 0x09, 0xC7, 0xC7, 0x8d, 0xcf, 0x07,
          0xE0, 0x10, 0x40, 0xb0, 0x03, 0xAF, 0xC8, 0xaf, 0xE1, 0x04, 0x04,
          0x04, 0x04, 0x01, 0x00, 0x22210000, 0x22416000, 0x0,
          0x22210000, 0x22416000, 0x0, 0x00 },
};       

void round_off_xres(u32 *xres) 
{
        if (*xres <= 640)
                *xres = 640;
        else if (*xres <= 800)
                *xres = 800;
        else if (*xres <= 1024)
                *xres = 1024;
        else if (*xres <= 1152)
                *xres = 1152;
        else if (*xres <= 1280)
                *xres = 1280;
        else
                *xres = 1600;
}

inline void round_off_yres(u32 *xres, u32 *yres)
{
        *yres = (*xres * 3) >> 2;
}

static int i810fb_find_best_mode(u32 xres, u32 yres, u32 pixclock)
{ 
        u32 diff = 0, diff_best = 0xFFFFFFFF, i = 0, i_best = 0; 
        u8 hfl = (u8) ((xres >> 3) - 1);

        for (i = 0; i < ARRAY_SIZE(std_modes); i++) { 
                if (std_modes[i].cr01 == hfl) { 
                        if (std_modes[i].pixclock <= pixclock)
                                diff = pixclock - std_modes[i].pixclock;
                        if (diff < diff_best) {  
                                i_best = i;
                                diff_best = diff;
                        }
                }
        }
        return i_best;
}

void i810fb_encode_registers(const struct fb_var_screeninfo *var,
                             struct i810fb_par *par, u32 xres, u32 yres)
{
        u32 i_best = i810fb_find_best_mode(xres, yres, par->regs.pixclock);

        par->regs = std_modes[i_best];

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

void i810fb_fill_var_timings(struct fb_var_screeninfo *var)
{
        u32 total, xres, yres;
        u32 mode, pixclock;

        xres = var->xres;
        yres = var->yres;
        
        pixclock = 1000000000 / var->pixclock;
        mode = i810fb_find_best_mode(xres, yres, pixclock);
        
        total = (std_modes[mode].cr00 | (std_modes[mode].cr35 & 1) << 8) + 3;
        total <<= 3;
        
        var->pixclock = 1000000000 / std_modes[mode].pixclock;
        var->right_margin = (std_modes[mode].cr04 << 3) - xres;
        var->hsync_len = ((std_modes[mode].cr05 & 0x1F) -
                         (std_modes[mode].cr04 & 0x1F)) << 3;
        var->left_margin = (total - (xres + var->right_margin + 
                                     var->hsync_len));
        var->sync = FB_SYNC_ON_GREEN;
        if (~(std_modes[mode].msr & (1 << 6)))
                var->sync |= FB_SYNC_HOR_HIGH_ACT;
        if (~(std_modes[mode].msr & (1 << 7)))
                var->sync |= FB_SYNC_VERT_HIGH_ACT;

        total = (std_modes[mode].cr06 | (std_modes[mode].cr30 & 0xF)  << 8) + 2;
        var->lower_margin = (std_modes[mode].cr10 |
                            (std_modes[mode].cr32 & 0x0F) << 8) - yres;
        var->vsync_len = (std_modes[mode].cr11 & 0x0F) -
                         (var->lower_margin & 0x0F);
        var->upper_margin = total - (yres + var->lower_margin + var->vsync_len);
}

u32 i810_get_watermark(const struct fb_var_screeninfo *var,
                       struct i810fb_par *par)
{
        struct mode_registers *params = &par->regs;
        u32 wmark = 0;
        
        if (par->mem_freq == 100) {
                switch (var->bits_per_pixel) {
                case 8:
                        wmark = params->bpp8_100;
                        break;
                case 16:
                        wmark = params->bpp16_100;
                        break;
                case 24:
                case 32:
                        wmark = params->bpp24_100;
                }
        } else {                                        
                switch (var->bits_per_pixel) {
                case 8:
                        wmark = params->bpp8_133;
                        break;
                case 16:
                        wmark = params->bpp16_133;
                        break;
                case 24:
                case 32:
                        wmark = params->bpp24_133;
                }
        }
        return wmark;
}