/*
 * Copyright 1998-2008 VIA Technologies, Inc. All Rights Reserved.
 * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.

 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation;
 * either version 2, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE.See the GNU General Public License
 * for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <linux/via-core.h>
#include "global.h"
#include "via_clock.h"

static struct pll_limit cle266_pll_limits[] = {
        {19, 19, 4, 0},
        {26, 102, 5, 0},
        {53, 112, 6, 0},
        {41, 100, 7, 0},
        {83, 108, 8, 0},
        {87, 118, 9, 0},
        {95, 115, 12, 0},
        {108, 108, 13, 0},
        {83, 83, 17, 0},
        {67, 98, 20, 0},
        {121, 121, 24, 0},
        {99, 99, 29, 0},
        {33, 33, 3, 1},
        {15, 23, 4, 1},
        {37, 121, 5, 1},
        {82, 82, 6, 1},
        {31, 84, 7, 1},
        {83, 83, 8, 1},
        {76, 127, 9, 1},
        {33, 121, 4, 2},
        {91, 118, 5, 2},
        {83, 109, 6, 2},
        {90, 90, 7, 2},
        {93, 93, 2, 3},
        {53, 53, 3, 3},
        {73, 117, 4, 3},
        {101, 127, 5, 3},
        {99, 99, 7, 3}
};

static struct pll_limit k800_pll_limits[] = {
        {22, 22, 2, 0},
        {28, 28, 3, 0},
        {81, 112, 3, 1},
        {86, 166, 4, 1},
        {109, 153, 5, 1},
        {66, 116, 3, 2},
        {93, 137, 4, 2},
        {117, 208, 5, 2},
        {30, 30, 2, 3},
        {69, 125, 3, 3},
        {89, 161, 4, 3},
        {121, 208, 5, 3},
        {66, 66, 2, 4},
        {85, 85, 3, 4},
        {141, 161, 4, 4},
        {177, 177, 5, 4}
};

static struct pll_limit cx700_pll_limits[] = {
        {98, 98, 3, 1},
        {86, 86, 4, 1},
        {109, 208, 5, 1},
        {68, 68, 2, 2},
        {95, 116, 3, 2},
        {93, 166, 4, 2},
        {110, 206, 5, 2},
        {174, 174, 7, 2},
        {82, 109, 3, 3},
        {117, 161, 4, 3},
        {112, 208, 5, 3},
        {141, 202, 5, 4}
};

static struct pll_limit vx855_pll_limits[] = {
        {86, 86, 4, 1},
        {108, 208, 5, 1},
        {110, 208, 5, 2},
        {83, 112, 3, 3},
        {103, 161, 4, 3},
        {112, 209, 5, 3},
        {142, 161, 4, 4},
        {141, 176, 5, 4}
};

/* according to VIA Technologies these values are based on experiment */
static struct io_reg scaling_parameters[] = {
        {VIACR, CR7A, 0xFF, 0x01},      /* LCD Scaling Parameter 1 */
        {VIACR, CR7B, 0xFF, 0x02},      /* LCD Scaling Parameter 2 */
        {VIACR, CR7C, 0xFF, 0x03},      /* LCD Scaling Parameter 3 */
        {VIACR, CR7D, 0xFF, 0x04},      /* LCD Scaling Parameter 4 */
        {VIACR, CR7E, 0xFF, 0x07},      /* LCD Scaling Parameter 5 */
        {VIACR, CR7F, 0xFF, 0x0A},      /* LCD Scaling Parameter 6 */
        {VIACR, CR80, 0xFF, 0x0D},      /* LCD Scaling Parameter 7 */
        {VIACR, CR81, 0xFF, 0x13},      /* LCD Scaling Parameter 8 */
        {VIACR, CR82, 0xFF, 0x16},      /* LCD Scaling Parameter 9 */
        {VIACR, CR83, 0xFF, 0x19},      /* LCD Scaling Parameter 10 */
        {VIACR, CR84, 0xFF, 0x1C},      /* LCD Scaling Parameter 11 */
        {VIACR, CR85, 0xFF, 0x1D},      /* LCD Scaling Parameter 12 */
        {VIACR, CR86, 0xFF, 0x1E},      /* LCD Scaling Parameter 13 */
        {VIACR, CR87, 0xFF, 0x1F},      /* LCD Scaling Parameter 14 */
};

static struct io_reg common_vga[] = {
        {VIACR, CR07, 0x10, 0x10}, /* [0] vertical total (bit 8)
                                        [1] vertical display end (bit 8)
                                        [2] vertical retrace start (bit 8)
                                        [3] start vertical blanking (bit 8)
                                        [4] line compare (bit 8)
                                        [5] vertical total (bit 9)
                                        [6] vertical display end (bit 9)
                                        [7] vertical retrace start (bit 9) */
        {VIACR, CR08, 0xFF, 0x00}, /* [0-4] preset row scan
                                        [5-6] byte panning */
        {VIACR, CR09, 0xDF, 0x40}, /* [0-4] max scan line
                                        [5] start vertical blanking (bit 9)
                                        [6] line compare (bit 9)
                                        [7] scan doubling */
        {VIACR, CR0A, 0xFF, 0x1E}, /* [0-4] cursor start
                                        [5] cursor disable */
        {VIACR, CR0B, 0xFF, 0x00}, /* [0-4] cursor end
                                        [5-6] cursor skew */
        {VIACR, CR0E, 0xFF, 0x00}, /* [0-7] cursor location (high) */
        {VIACR, CR0F, 0xFF, 0x00}, /* [0-7] cursor location (low) */
        {VIACR, CR11, 0xF0, 0x80}, /* [0-3] vertical retrace end
                                        [6] memory refresh bandwidth
                                        [7] CRTC register protect enable */
        {VIACR, CR14, 0xFF, 0x00}, /* [0-4] underline location
                                        [5] divide memory address clock by 4
                                        [6] double word addressing */
        {VIACR, CR17, 0xFF, 0x63}, /* [0-1] mapping of display address 13-14
                                        [2] divide scan line clock by 2
                                        [3] divide memory address clock by 2
                                        [5] address wrap
                                        [6] byte mode select
                                        [7] sync enable */
        {VIACR, CR18, 0xFF, 0xFF}, /* [0-7] line compare */
};

static struct fifo_depth_select display_fifo_depth_reg = {
        /* IGA1 FIFO Depth_Select */
        {IGA1_FIFO_DEPTH_SELECT_REG_NUM, {{SR17, 0, 7} } },
        /* IGA2 FIFO Depth_Select */
        {IGA2_FIFO_DEPTH_SELECT_REG_NUM,
         {{CR68, 4, 7}, {CR94, 7, 7}, {CR95, 7, 7} } }
};

static struct fifo_threshold_select fifo_threshold_select_reg = {
        /* IGA1 FIFO Threshold Select */
        {IGA1_FIFO_THRESHOLD_REG_NUM, {{SR16, 0, 5}, {SR16, 7, 7} } },
        /* IGA2 FIFO Threshold Select */
        {IGA2_FIFO_THRESHOLD_REG_NUM, {{CR68, 0, 3}, {CR95, 4, 6} } }
};

static struct fifo_high_threshold_select fifo_high_threshold_select_reg = {
        /* IGA1 FIFO High Threshold Select */
        {IGA1_FIFO_HIGH_THRESHOLD_REG_NUM, {{SR18, 0, 5}, {SR18, 7, 7} } },
        /* IGA2 FIFO High Threshold Select */
        {IGA2_FIFO_HIGH_THRESHOLD_REG_NUM, {{CR92, 0, 3}, {CR95, 0, 2} } }
};

static struct display_queue_expire_num display_queue_expire_num_reg = {
        /* IGA1 Display Queue Expire Num */
        {IGA1_DISPLAY_QUEUE_EXPIRE_NUM_REG_NUM, {{SR22, 0, 4} } },
        /* IGA2 Display Queue Expire Num */
        {IGA2_DISPLAY_QUEUE_EXPIRE_NUM_REG_NUM, {{CR94, 0, 6} } }
};

/* Definition Fetch Count Registers*/
static struct fetch_count fetch_count_reg = {
        /* IGA1 Fetch Count Register */
        {IGA1_FETCH_COUNT_REG_NUM, {{SR1C, 0, 7}, {SR1D, 0, 1} } },
        /* IGA2 Fetch Count Register */
        {IGA2_FETCH_COUNT_REG_NUM, {{CR65, 0, 7}, {CR67, 2, 3} } }
};

static struct rgbLUT palLUT_table[] = {
        /* {R,G,B} */
        /* Index 0x00~0x03 */
        {0x00, 0x00, 0x00}, {0x00, 0x00, 0x2A}, {0x00, 0x2A, 0x00}, {0x00,
                                                                     0x2A,
                                                                     0x2A},
        /* Index 0x04~0x07 */
        {0x2A, 0x00, 0x00}, {0x2A, 0x00, 0x2A}, {0x2A, 0x15, 0x00}, {0x2A,
                                                                     0x2A,
                                                                     0x2A},
        /* Index 0x08~0x0B */
        {0x15, 0x15, 0x15}, {0x15, 0x15, 0x3F}, {0x15, 0x3F, 0x15}, {0x15,
                                                                     0x3F,
                                                                     0x3F},
        /* Index 0x0C~0x0F */
        {0x3F, 0x15, 0x15}, {0x3F, 0x15, 0x3F}, {0x3F, 0x3F, 0x15}, {0x3F,
                                                                     0x3F,
                                                                     0x3F},
        /* Index 0x10~0x13 */
        {0x00, 0x00, 0x00}, {0x05, 0x05, 0x05}, {0x08, 0x08, 0x08}, {0x0B,
                                                                     0x0B,
                                                                     0x0B},
        /* Index 0x14~0x17 */
        {0x0E, 0x0E, 0x0E}, {0x11, 0x11, 0x11}, {0x14, 0x14, 0x14}, {0x18,
                                                                     0x18,
                                                                     0x18},
        /* Index 0x18~0x1B */
        {0x1C, 0x1C, 0x1C}, {0x20, 0x20, 0x20}, {0x24, 0x24, 0x24}, {0x28,
                                                                     0x28,
                                                                     0x28},
        /* Index 0x1C~0x1F */
        {0x2D, 0x2D, 0x2D}, {0x32, 0x32, 0x32}, {0x38, 0x38, 0x38}, {0x3F,
                                                                     0x3F,
                                                                     0x3F},
        /* Index 0x20~0x23 */
        {0x00, 0x00, 0x3F}, {0x10, 0x00, 0x3F}, {0x1F, 0x00, 0x3F}, {0x2F,
                                                                     0x00,
                                                                     0x3F},
        /* Index 0x24~0x27 */
        {0x3F, 0x00, 0x3F}, {0x3F, 0x00, 0x2F}, {0x3F, 0x00, 0x1F}, {0x3F,
                                                                     0x00,
                                                                     0x10},
        /* Index 0x28~0x2B */
        {0x3F, 0x00, 0x00}, {0x3F, 0x10, 0x00}, {0x3F, 0x1F, 0x00}, {0x3F,
                                                                     0x2F,
                                                                     0x00},
        /* Index 0x2C~0x2F */
        {0x3F, 0x3F, 0x00}, {0x2F, 0x3F, 0x00}, {0x1F, 0x3F, 0x00}, {0x10,
                                                                     0x3F,
                                                                     0x00},
        /* Index 0x30~0x33 */
        {0x00, 0x3F, 0x00}, {0x00, 0x3F, 0x10}, {0x00, 0x3F, 0x1F}, {0x00,
                                                                     0x3F,
                                                                     0x2F},
        /* Index 0x34~0x37 */
        {0x00, 0x3F, 0x3F}, {0x00, 0x2F, 0x3F}, {0x00, 0x1F, 0x3F}, {0x00,
                                                                     0x10,
                                                                     0x3F},
        /* Index 0x38~0x3B */
        {0x1F, 0x1F, 0x3F}, {0x27, 0x1F, 0x3F}, {0x2F, 0x1F, 0x3F}, {0x37,
                                                                     0x1F,
                                                                     0x3F},
        /* Index 0x3C~0x3F */
        {0x3F, 0x1F, 0x3F}, {0x3F, 0x1F, 0x37}, {0x3F, 0x1F, 0x2F}, {0x3F,
                                                                     0x1F,
                                                                     0x27},
        /* Index 0x40~0x43 */
        {0x3F, 0x1F, 0x1F}, {0x3F, 0x27, 0x1F}, {0x3F, 0x2F, 0x1F}, {0x3F,
                                                                     0x3F,
                                                                     0x1F},
        /* Index 0x44~0x47 */
        {0x3F, 0x3F, 0x1F}, {0x37, 0x3F, 0x1F}, {0x2F, 0x3F, 0x1F}, {0x27,
                                                                     0x3F,
                                                                     0x1F},
        /* Index 0x48~0x4B */
        {0x1F, 0x3F, 0x1F}, {0x1F, 0x3F, 0x27}, {0x1F, 0x3F, 0x2F}, {0x1F,
                                                                     0x3F,
                                                                     0x37},
        /* Index 0x4C~0x4F */
        {0x1F, 0x3F, 0x3F}, {0x1F, 0x37, 0x3F}, {0x1F, 0x2F, 0x3F}, {0x1F,
                                                                     0x27,
                                                                     0x3F},
        /* Index 0x50~0x53 */
        {0x2D, 0x2D, 0x3F}, {0x31, 0x2D, 0x3F}, {0x36, 0x2D, 0x3F}, {0x3A,
                                                                     0x2D,
                                                                     0x3F},
        /* Index 0x54~0x57 */
        {0x3F, 0x2D, 0x3F}, {0x3F, 0x2D, 0x3A}, {0x3F, 0x2D, 0x36}, {0x3F,
                                                                     0x2D,
                                                                     0x31},
        /* Index 0x58~0x5B */
        {0x3F, 0x2D, 0x2D}, {0x3F, 0x31, 0x2D}, {0x3F, 0x36, 0x2D}, {0x3F,
                                                                     0x3A,
                                                                     0x2D},
        /* Index 0x5C~0x5F */
        {0x3F, 0x3F, 0x2D}, {0x3A, 0x3F, 0x2D}, {0x36, 0x3F, 0x2D}, {0x31,
                                                                     0x3F,
                                                                     0x2D},
        /* Index 0x60~0x63 */
        {0x2D, 0x3F, 0x2D}, {0x2D, 0x3F, 0x31}, {0x2D, 0x3F, 0x36}, {0x2D,
                                                                     0x3F,
                                                                     0x3A},
        /* Index 0x64~0x67 */
        {0x2D, 0x3F, 0x3F}, {0x2D, 0x3A, 0x3F}, {0x2D, 0x36, 0x3F}, {0x2D,
                                                                     0x31,
                                                                     0x3F},
        /* Index 0x68~0x6B */
        {0x00, 0x00, 0x1C}, {0x07, 0x00, 0x1C}, {0x0E, 0x00, 0x1C}, {0x15,
                                                                     0x00,
                                                                     0x1C},
        /* Index 0x6C~0x6F */
        {0x1C, 0x00, 0x1C}, {0x1C, 0x00, 0x15}, {0x1C, 0x00, 0x0E}, {0x1C,
                                                                     0x00,
                                                                     0x07},
        /* Index 0x70~0x73 */
        {0x1C, 0x00, 0x00}, {0x1C, 0x07, 0x00}, {0x1C, 0x0E, 0x00}, {0x1C,
                                                                     0x15,
                                                                     0x00},
        /* Index 0x74~0x77 */
        {0x1C, 0x1C, 0x00}, {0x15, 0x1C, 0x00}, {0x0E, 0x1C, 0x00}, {0x07,
                                                                     0x1C,
                                                                     0x00},
        /* Index 0x78~0x7B */
        {0x00, 0x1C, 0x00}, {0x00, 0x1C, 0x07}, {0x00, 0x1C, 0x0E}, {0x00,
                                                                     0x1C,
                                                                     0x15},
        /* Index 0x7C~0x7F */
        {0x00, 0x1C, 0x1C}, {0x00, 0x15, 0x1C}, {0x00, 0x0E, 0x1C}, {0x00,
                                                                     0x07,
                                                                     0x1C},
        /* Index 0x80~0x83 */
        {0x0E, 0x0E, 0x1C}, {0x11, 0x0E, 0x1C}, {0x15, 0x0E, 0x1C}, {0x18,
                                                                     0x0E,
                                                                     0x1C},
        /* Index 0x84~0x87 */
        {0x1C, 0x0E, 0x1C}, {0x1C, 0x0E, 0x18}, {0x1C, 0x0E, 0x15}, {0x1C,
                                                                     0x0E,
                                                                     0x11},
        /* Index 0x88~0x8B */
        {0x1C, 0x0E, 0x0E}, {0x1C, 0x11, 0x0E}, {0x1C, 0x15, 0x0E}, {0x1C,
                                                                     0x18,
                                                                     0x0E},
        /* Index 0x8C~0x8F */
        {0x1C, 0x1C, 0x0E}, {0x18, 0x1C, 0x0E}, {0x15, 0x1C, 0x0E}, {0x11,
                                                                     0x1C,
                                                                     0x0E},
        /* Index 0x90~0x93 */
        {0x0E, 0x1C, 0x0E}, {0x0E, 0x1C, 0x11}, {0x0E, 0x1C, 0x15}, {0x0E,
                                                                     0x1C,
                                                                     0x18},
        /* Index 0x94~0x97 */
        {0x0E, 0x1C, 0x1C}, {0x0E, 0x18, 0x1C}, {0x0E, 0x15, 0x1C}, {0x0E,
                                                                     0x11,
                                                                     0x1C},
        /* Index 0x98~0x9B */
        {0x14, 0x14, 0x1C}, {0x16, 0x14, 0x1C}, {0x18, 0x14, 0x1C}, {0x1A,
                                                                     0x14,
                                                                     0x1C},
        /* Index 0x9C~0x9F */
        {0x1C, 0x14, 0x1C}, {0x1C, 0x14, 0x1A}, {0x1C, 0x14, 0x18}, {0x1C,
                                                                     0x14,
                                                                     0x16},
        /* Index 0xA0~0xA3 */
        {0x1C, 0x14, 0x14}, {0x1C, 0x16, 0x14}, {0x1C, 0x18, 0x14}, {0x1C,
                                                                     0x1A,
                                                                     0x14},
        /* Index 0xA4~0xA7 */
        {0x1C, 0x1C, 0x14}, {0x1A, 0x1C, 0x14}, {0x18, 0x1C, 0x14}, {0x16,
                                                                     0x1C,
                                                                     0x14},
        /* Index 0xA8~0xAB */
        {0x14, 0x1C, 0x14}, {0x14, 0x1C, 0x16}, {0x14, 0x1C, 0x18}, {0x14,
                                                                     0x1C,
                                                                     0x1A},
        /* Index 0xAC~0xAF */
        {0x14, 0x1C, 0x1C}, {0x14, 0x1A, 0x1C}, {0x14, 0x18, 0x1C}, {0x14,
                                                                     0x16,
                                                                     0x1C},
        /* Index 0xB0~0xB3 */
        {0x00, 0x00, 0x10}, {0x04, 0x00, 0x10}, {0x08, 0x00, 0x10}, {0x0C,
                                                                     0x00,
                                                                     0x10},
        /* Index 0xB4~0xB7 */
        {0x10, 0x00, 0x10}, {0x10, 0x00, 0x0C}, {0x10, 0x00, 0x08}, {0x10,
                                                                     0x00,
                                                                     0x04},
        /* Index 0xB8~0xBB */
        {0x10, 0x00, 0x00}, {0x10, 0x04, 0x00}, {0x10, 0x08, 0x00}, {0x10,
                                                                     0x0C,
                                                                     0x00},
        /* Index 0xBC~0xBF */
        {0x10, 0x10, 0x00}, {0x0C, 0x10, 0x00}, {0x08, 0x10, 0x00}, {0x04,
                                                                     0x10,
                                                                     0x00},
        /* Index 0xC0~0xC3 */
        {0x00, 0x10, 0x00}, {0x00, 0x10, 0x04}, {0x00, 0x10, 0x08}, {0x00,
                                                                     0x10,
                                                                     0x0C},
        /* Index 0xC4~0xC7 */
        {0x00, 0x10, 0x10}, {0x00, 0x0C, 0x10}, {0x00, 0x08, 0x10}, {0x00,
                                                                     0x04,
                                                                     0x10},
        /* Index 0xC8~0xCB */
        {0x08, 0x08, 0x10}, {0x0A, 0x08, 0x10}, {0x0C, 0x08, 0x10}, {0x0E,
                                                                     0x08,
                                                                     0x10},
        /* Index 0xCC~0xCF */
        {0x10, 0x08, 0x10}, {0x10, 0x08, 0x0E}, {0x10, 0x08, 0x0C}, {0x10,
                                                                     0x08,
                                                                     0x0A},
        /* Index 0xD0~0xD3 */
        {0x10, 0x08, 0x08}, {0x10, 0x0A, 0x08}, {0x10, 0x0C, 0x08}, {0x10,
                                                                     0x0E,
                                                                     0x08},
        /* Index 0xD4~0xD7 */
        {0x10, 0x10, 0x08}, {0x0E, 0x10, 0x08}, {0x0C, 0x10, 0x08}, {0x0A,
                                                                     0x10,
                                                                     0x08},
        /* Index 0xD8~0xDB */
        {0x08, 0x10, 0x08}, {0x08, 0x10, 0x0A}, {0x08, 0x10, 0x0C}, {0x08,
                                                                     0x10,
                                                                     0x0E},
        /* Index 0xDC~0xDF */
        {0x08, 0x10, 0x10}, {0x08, 0x0E, 0x10}, {0x08, 0x0C, 0x10}, {0x08,
                                                                     0x0A,
                                                                     0x10},
        /* Index 0xE0~0xE3 */
        {0x0B, 0x0B, 0x10}, {0x0C, 0x0B, 0x10}, {0x0D, 0x0B, 0x10}, {0x0F,
                                                                     0x0B,
                                                                     0x10},
        /* Index 0xE4~0xE7 */
        {0x10, 0x0B, 0x10}, {0x10, 0x0B, 0x0F}, {0x10, 0x0B, 0x0D}, {0x10,
                                                                     0x0B,
                                                                     0x0C},
        /* Index 0xE8~0xEB */
        {0x10, 0x0B, 0x0B}, {0x10, 0x0C, 0x0B}, {0x10, 0x0D, 0x0B}, {0x10,
                                                                     0x0F,
                                                                     0x0B},
        /* Index 0xEC~0xEF */
        {0x10, 0x10, 0x0B}, {0x0F, 0x10, 0x0B}, {0x0D, 0x10, 0x0B}, {0x0C,
                                                                     0x10,
                                                                     0x0B},
        /* Index 0xF0~0xF3 */
        {0x0B, 0x10, 0x0B}, {0x0B, 0x10, 0x0C}, {0x0B, 0x10, 0x0D}, {0x0B,
                                                                     0x10,
                                                                     0x0F},
        /* Index 0xF4~0xF7 */
        {0x0B, 0x10, 0x10}, {0x0B, 0x0F, 0x10}, {0x0B, 0x0D, 0x10}, {0x0B,
                                                                     0x0C,
                                                                     0x10},
        /* Index 0xF8~0xFB */
        {0x00, 0x00, 0x00}, {0x00, 0x00, 0x00}, {0x00, 0x00, 0x00}, {0x00,
                                                                     0x00,
                                                                     0x00},
        /* Index 0xFC~0xFF */
        {0x00, 0x00, 0x00}, {0x00, 0x00, 0x00}, {0x00, 0x00, 0x00}, {0x00,
                                                                     0x00,
                                                                     0x00}
};

static struct via_device_mapping device_mapping[] = {
        {VIA_LDVP0, "LDVP0"},
        {VIA_LDVP1, "LDVP1"},
        {VIA_DVP0, "DVP0"},
        {VIA_CRT, "CRT"},
        {VIA_DVP1, "DVP1"},
        {VIA_LVDS1, "LVDS1"},
        {VIA_LVDS2, "LVDS2"}
};

/* structure with function pointers to support clock control */
static struct via_clock clock;

static void load_fix_bit_crtc_reg(void);
static void init_gfx_chip_info(int chip_type);
static void init_tmds_chip_info(void);
static void init_lvds_chip_info(void);
static void device_screen_off(void);
static void device_screen_on(void);
static void set_display_channel(void);
static void device_off(void);
static void device_on(void);
static void enable_second_display_channel(void);
static void disable_second_display_channel(void);

void viafb_lock_crt(void)
{
        viafb_write_reg_mask(CR11, VIACR, BIT7, BIT7);
}

void viafb_unlock_crt(void)
{
        viafb_write_reg_mask(CR11, VIACR, 0, BIT7);
        viafb_write_reg_mask(CR47, VIACR, 0, BIT0);
}

static void write_dac_reg(u8 index, u8 r, u8 g, u8 b)
{
        outb(index, LUT_INDEX_WRITE);
        outb(r, LUT_DATA);
        outb(g, LUT_DATA);
        outb(b, LUT_DATA);
}

static u32 get_dvi_devices(int output_interface)
{
        switch (output_interface) {
        case INTERFACE_DVP0:
                return VIA_DVP0 | VIA_LDVP0;

        case INTERFACE_DVP1:
                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CLE266)
                        return VIA_LDVP1;
                else
                        return VIA_DVP1;

        case INTERFACE_DFP_HIGH:
                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CLE266)
                        return 0;
                else
                        return VIA_LVDS2 | VIA_DVP0;

        case INTERFACE_DFP_LOW:
                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CLE266)
                        return 0;
                else
                        return VIA_DVP1 | VIA_LVDS1;

        case INTERFACE_TMDS:
                return VIA_LVDS1;
        }

        return 0;
}

static u32 get_lcd_devices(int output_interface)
{
        switch (output_interface) {
        case INTERFACE_DVP0:
                return VIA_DVP0;

        case INTERFACE_DVP1:
                return VIA_DVP1;

        case INTERFACE_DFP_HIGH:
                return VIA_LVDS2 | VIA_DVP0;

        case INTERFACE_DFP_LOW:
                return VIA_LVDS1 | VIA_DVP1;

        case INTERFACE_DFP:
                return VIA_LVDS1 | VIA_LVDS2;

        case INTERFACE_LVDS0:
        case INTERFACE_LVDS0LVDS1:
                return VIA_LVDS1;

        case INTERFACE_LVDS1:
                return VIA_LVDS2;
        }

        return 0;
}

/*Set IGA path for each device*/
void viafb_set_iga_path(void)
{
        int crt_iga_path = 0;

        if (viafb_SAMM_ON == 1) {
                if (viafb_CRT_ON) {
                        if (viafb_primary_dev == CRT_Device)
                                crt_iga_path = IGA1;
                        else
                                crt_iga_path = IGA2;
                }

                if (viafb_DVI_ON) {
                        if (viafb_primary_dev == DVI_Device)
                                viaparinfo->tmds_setting_info->iga_path = IGA1;
                        else
                                viaparinfo->tmds_setting_info->iga_path = IGA2;
                }

                if (viafb_LCD_ON) {
                        if (viafb_primary_dev == LCD_Device) {
                                if (viafb_dual_fb &&
                                        (viaparinfo->chip_info->gfx_chip_name ==
                                        UNICHROME_CLE266)) {
                                        viaparinfo->
                                        lvds_setting_info->iga_path = IGA2;
                                        crt_iga_path = IGA1;
                                        viaparinfo->
                                        tmds_setting_info->iga_path = IGA1;
                                } else
                                        viaparinfo->
                                        lvds_setting_info->iga_path = IGA1;
                        } else {
                                viaparinfo->lvds_setting_info->iga_path = IGA2;
                        }
                }
                if (viafb_LCD2_ON) {
                        if (LCD2_Device == viafb_primary_dev)
                                viaparinfo->lvds_setting_info2->iga_path = IGA1;
                        else
                                viaparinfo->lvds_setting_info2->iga_path = IGA2;
                }
        } else {
                viafb_SAMM_ON = 0;

                if (viafb_CRT_ON && viafb_LCD_ON) {
                        crt_iga_path = IGA1;
                        viaparinfo->lvds_setting_info->iga_path = IGA2;
                } else if (viafb_CRT_ON && viafb_DVI_ON) {
                        crt_iga_path = IGA1;
                        viaparinfo->tmds_setting_info->iga_path = IGA2;
                } else if (viafb_LCD_ON && viafb_DVI_ON) {
                        viaparinfo->tmds_setting_info->iga_path = IGA1;
                        viaparinfo->lvds_setting_info->iga_path = IGA2;
                } else if (viafb_LCD_ON && viafb_LCD2_ON) {
                        viaparinfo->lvds_setting_info->iga_path = IGA2;
                        viaparinfo->lvds_setting_info2->iga_path = IGA2;
                } else if (viafb_CRT_ON) {
                        crt_iga_path = IGA1;
                } else if (viafb_LCD_ON) {
                        viaparinfo->lvds_setting_info->iga_path = IGA2;
                } else if (viafb_DVI_ON) {
                        viaparinfo->tmds_setting_info->iga_path = IGA1;
                }
        }

        viaparinfo->shared->iga1_devices = 0;
        viaparinfo->shared->iga2_devices = 0;
        if (viafb_CRT_ON) {
                if (crt_iga_path == IGA1)
                        viaparinfo->shared->iga1_devices |= VIA_CRT;
                else
                        viaparinfo->shared->iga2_devices |= VIA_CRT;
        }

        if (viafb_DVI_ON) {
                if (viaparinfo->tmds_setting_info->iga_path == IGA1)
                        viaparinfo->shared->iga1_devices |= get_dvi_devices(
                                viaparinfo->chip_info->
                                tmds_chip_info.output_interface);
                else
                        viaparinfo->shared->iga2_devices |= get_dvi_devices(
                                viaparinfo->chip_info->
                                tmds_chip_info.output_interface);
        }

        if (viafb_LCD_ON) {
                if (viaparinfo->lvds_setting_info->iga_path == IGA1)
                        viaparinfo->shared->iga1_devices |= get_lcd_devices(
                                viaparinfo->chip_info->
                                lvds_chip_info.output_interface);
                else
                        viaparinfo->shared->iga2_devices |= get_lcd_devices(
                                viaparinfo->chip_info->
                                lvds_chip_info.output_interface);
        }

        if (viafb_LCD2_ON) {
                if (viaparinfo->lvds_setting_info2->iga_path == IGA1)
                        viaparinfo->shared->iga1_devices |= get_lcd_devices(
                                viaparinfo->chip_info->
                                lvds_chip_info2.output_interface);
                else
                        viaparinfo->shared->iga2_devices |= get_lcd_devices(
                                viaparinfo->chip_info->
                                lvds_chip_info2.output_interface);
        }

        /* looks like the OLPC has its display wired to DVP1 and LVDS2 */
        if (machine_is_olpc())
                viaparinfo->shared->iga2_devices = VIA_DVP1 | VIA_LVDS2;
}

static void set_color_register(u8 index, u8 red, u8 green, u8 blue)
{
        outb(0xFF, 0x3C6); /* bit mask of palette */
        outb(index, 0x3C8);
        outb(red, 0x3C9);
        outb(green, 0x3C9);
        outb(blue, 0x3C9);
}

void viafb_set_primary_color_register(u8 index, u8 red, u8 green, u8 blue)
{
        viafb_write_reg_mask(0x1A, VIASR, 0x00, 0x01);
        set_color_register(index, red, green, blue);
}

void viafb_set_secondary_color_register(u8 index, u8 red, u8 green, u8 blue)
{
        viafb_write_reg_mask(0x1A, VIASR, 0x01, 0x01);
        set_color_register(index, red, green, blue);
}

static void set_source_common(u8 index, u8 offset, u8 iga)
{
        u8 value, mask = 1 << offset;

        switch (iga) {
        case IGA1:
                value = 0x00;
                break;
        case IGA2:
                value = mask;
                break;
        default:
                printk(KERN_WARNING "viafb: Unsupported source: %d\n", iga);
                return;
        }

        via_write_reg_mask(VIACR, index, value, mask);
}

static void set_crt_source(u8 iga)
{
        u8 value;

        switch (iga) {
        case IGA1:
                value = 0x00;
                break;
        case IGA2:
                value = 0x40;
                break;
        default:
                printk(KERN_WARNING "viafb: Unsupported source: %d\n", iga);
                return;
        }

        via_write_reg_mask(VIASR, 0x16, value, 0x40);
}

static inline void set_ldvp0_source(u8 iga)
{
        set_source_common(0x6C, 7, iga);
}

static inline void set_ldvp1_source(u8 iga)
{
        set_source_common(0x93, 7, iga);
}

static inline void set_dvp0_source(u8 iga)
{
        set_source_common(0x96, 4, iga);
}

static inline void set_dvp1_source(u8 iga)
{
        set_source_common(0x9B, 4, iga);
}

static inline void set_lvds1_source(u8 iga)
{
        set_source_common(0x99, 4, iga);
}

static inline void set_lvds2_source(u8 iga)
{
        set_source_common(0x97, 4, iga);
}

void via_set_source(u32 devices, u8 iga)
{
        if (devices & VIA_LDVP0)
                set_ldvp0_source(iga);
        if (devices & VIA_LDVP1)
                set_ldvp1_source(iga);
        if (devices & VIA_DVP0)
                set_dvp0_source(iga);
        if (devices & VIA_CRT)
                set_crt_source(iga);
        if (devices & VIA_DVP1)
                set_dvp1_source(iga);
        if (devices & VIA_LVDS1)
                set_lvds1_source(iga);
        if (devices & VIA_LVDS2)
                set_lvds2_source(iga);
}

static void set_crt_state(u8 state)
{
        u8 value;

        switch (state) {
        case VIA_STATE_ON:
                value = 0x00;
                break;
        case VIA_STATE_STANDBY:
                value = 0x10;
                break;
        case VIA_STATE_SUSPEND:
                value = 0x20;
                break;
        case VIA_STATE_OFF:
                value = 0x30;
                break;
        default:
                return;
        }

        via_write_reg_mask(VIACR, 0x36, value, 0x30);
}

static void set_dvp0_state(u8 state)
{
        u8 value;

        switch (state) {
        case VIA_STATE_ON:
                value = 0xC0;
                break;
        case VIA_STATE_OFF:
                value = 0x00;
                break;
        default:
                return;
        }

        via_write_reg_mask(VIASR, 0x1E, value, 0xC0);
}

static void set_dvp1_state(u8 state)
{
        u8 value;

        switch (state) {
        case VIA_STATE_ON:
                value = 0x30;
                break;
        case VIA_STATE_OFF:
                value = 0x00;
                break;
        default:
                return;
        }

        via_write_reg_mask(VIASR, 0x1E, value, 0x30);
}

static void set_lvds1_state(u8 state)
{
        u8 value;

        switch (state) {
        case VIA_STATE_ON:
                value = 0x03;
                break;
        case VIA_STATE_OFF:
                value = 0x00;
                break;
        default:
                return;
        }

        via_write_reg_mask(VIASR, 0x2A, value, 0x03);
}

static void set_lvds2_state(u8 state)
{
        u8 value;

        switch (state) {
        case VIA_STATE_ON:
                value = 0x0C;
                break;
        case VIA_STATE_OFF:
                value = 0x00;
                break;
        default:
                return;
        }

        via_write_reg_mask(VIASR, 0x2A, value, 0x0C);
}

void via_set_state(u32 devices, u8 state)
{
        /*
        TODO: Can we enable/disable these devices? How?
        if (devices & VIA_LDVP0)
        if (devices & VIA_LDVP1)
        */
        if (devices & VIA_DVP0)
                set_dvp0_state(state);
        if (devices & VIA_CRT)
                set_crt_state(state);
        if (devices & VIA_DVP1)
                set_dvp1_state(state);
        if (devices & VIA_LVDS1)
                set_lvds1_state(state);
        if (devices & VIA_LVDS2)
                set_lvds2_state(state);
}

void via_set_sync_polarity(u32 devices, u8 polarity)
{
        if (polarity & ~(VIA_HSYNC_NEGATIVE | VIA_VSYNC_NEGATIVE)) {
                printk(KERN_WARNING "viafb: Unsupported polarity: %d\n",
                        polarity);
                return;
        }

        if (devices & VIA_CRT)
                via_write_misc_reg_mask(polarity << 6, 0xC0);
        if (devices & VIA_DVP1)
                via_write_reg_mask(VIACR, 0x9B, polarity << 5, 0x60);
        if (devices & VIA_LVDS1)
                via_write_reg_mask(VIACR, 0x99, polarity << 5, 0x60);
        if (devices & VIA_LVDS2)
                via_write_reg_mask(VIACR, 0x97, polarity << 5, 0x60);
}

u32 via_parse_odev(char *input, char **end)
{
        char *ptr = input;
        u32 odev = 0;
        bool next = true;
        int i, len;

        while (next) {
                next = false;
                for (i = 0; i < ARRAY_SIZE(device_mapping); i++) {
                        len = strlen(device_mapping[i].name);
                        if (!strncmp(ptr, device_mapping[i].name, len)) {
                                odev |= device_mapping[i].device;
                                ptr += len;
                                if (*ptr == ',') {
                                        ptr++;
                                        next = true;
                                }
                        }
                }
        }

        *end = ptr;
        return odev;
}

void via_odev_to_seq(struct seq_file *m, u32 odev)
{
        int i, count = 0;

        for (i = 0; i < ARRAY_SIZE(device_mapping); i++) {
                if (odev & device_mapping[i].device) {
                        if (count > 0)
                                seq_putc(m, ',');

                        seq_puts(m, device_mapping[i].name);
                        count++;
                }
        }

        seq_putc(m, '\n');
}

static void load_fix_bit_crtc_reg(void)
{
        viafb_unlock_crt();

        /* always set to 1 */
        viafb_write_reg_mask(CR03, VIACR, 0x80, BIT7);
        /* line compare should set all bits = 1 (extend modes) */
        viafb_write_reg_mask(CR35, VIACR, 0x10, BIT4);
        /* line compare should set all bits = 1 (extend modes) */
        viafb_write_reg_mask(CR33, VIACR, 0x06, BIT0 + BIT1 + BIT2);
        /*viafb_write_reg_mask(CR32, VIACR, 0x01, BIT0); */

        viafb_lock_crt();

        /* If K8M800, enable Prefetch Mode. */
        if ((viaparinfo->chip_info->gfx_chip_name == UNICHROME_K800)
                || (viaparinfo->chip_info->gfx_chip_name == UNICHROME_K8M890))
                viafb_write_reg_mask(CR33, VIACR, 0x08, BIT3);
        if ((viaparinfo->chip_info->gfx_chip_name == UNICHROME_CLE266)
            && (viaparinfo->chip_info->gfx_chip_revision == CLE266_REVISION_AX))
                viafb_write_reg_mask(SR1A, VIASR, 0x02, BIT1);

}

void viafb_load_reg(int timing_value, int viafb_load_reg_num,
        struct io_register *reg,
              int io_type)
{
        int reg_mask;
        int bit_num = 0;
        int data;
        int i, j;
        int shift_next_reg;
        int start_index, end_index, cr_index;
        u16 get_bit;

        for (i = 0; i < viafb_load_reg_num; i++) {
                reg_mask = 0;
                data = 0;
                start_index = reg[i].start_bit;
                end_index = reg[i].end_bit;
                cr_index = reg[i].io_addr;

                shift_next_reg = bit_num;
                for (j = start_index; j <= end_index; j++) {
                        /*if (bit_num==8) timing_value = timing_value >>8; */
                        reg_mask = reg_mask | (BIT0 << j);

                        get_bit = (timing_value & (BIT0 << bit_num));
                        data =
                            data | ((get_bit >> shift_next_reg) << start_index);
                        bit_num++;
                }
                if (io_type == VIACR)
                        viafb_write_reg_mask(cr_index, VIACR, data, reg_mask);
                else
                        viafb_write_reg_mask(cr_index, VIASR, data, reg_mask);
        }

}

/* Write Registers */
void viafb_write_regx(struct io_reg RegTable[], int ItemNum)
{
        int i;

        /*DEBUG_MSG(KERN_INFO "Table Size : %x!!\n",ItemNum ); */

        for (i = 0; i < ItemNum; i++)
                via_write_reg_mask(RegTable[i].port, RegTable[i].index,
                        RegTable[i].value, RegTable[i].mask);
}

void viafb_load_fetch_count_reg(int h_addr, int bpp_byte, int set_iga)
{
        int reg_value;
        int viafb_load_reg_num;
        struct io_register *reg = NULL;

        switch (set_iga) {
        case IGA1:
                reg_value = IGA1_FETCH_COUNT_FORMULA(h_addr, bpp_byte);
                viafb_load_reg_num = fetch_count_reg.
                        iga1_fetch_count_reg.reg_num;
                reg = fetch_count_reg.iga1_fetch_count_reg.reg;
                viafb_load_reg(reg_value, viafb_load_reg_num, reg, VIASR);
                break;
        case IGA2:
                reg_value = IGA2_FETCH_COUNT_FORMULA(h_addr, bpp_byte);
                viafb_load_reg_num = fetch_count_reg.
                        iga2_fetch_count_reg.reg_num;
                reg = fetch_count_reg.iga2_fetch_count_reg.reg;
                viafb_load_reg(reg_value, viafb_load_reg_num, reg, VIACR);
                break;
        }

}

void viafb_load_FIFO_reg(int set_iga, int hor_active, int ver_active)
{
        int reg_value;
        int viafb_load_reg_num;
        struct io_register *reg = NULL;
        int iga1_fifo_max_depth = 0, iga1_fifo_threshold =
            0, iga1_fifo_high_threshold = 0, iga1_display_queue_expire_num = 0;
        int iga2_fifo_max_depth = 0, iga2_fifo_threshold =
            0, iga2_fifo_high_threshold = 0, iga2_display_queue_expire_num = 0;

        if (set_iga == IGA1) {
                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_K800) {
                        iga1_fifo_max_depth = K800_IGA1_FIFO_MAX_DEPTH;
                        iga1_fifo_threshold = K800_IGA1_FIFO_THRESHOLD;
                        iga1_fifo_high_threshold =
                            K800_IGA1_FIFO_HIGH_THRESHOLD;
                        /* If resolution > 1280x1024, expire length = 64, else
                           expire length = 128 */
                        if ((hor_active > 1280) && (ver_active > 1024))
                                iga1_display_queue_expire_num = 16;
                        else
                                iga1_display_queue_expire_num =
                                    K800_IGA1_DISPLAY_QUEUE_EXPIRE_NUM;

                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_PM800) {
                        iga1_fifo_max_depth = P880_IGA1_FIFO_MAX_DEPTH;
                        iga1_fifo_threshold = P880_IGA1_FIFO_THRESHOLD;
                        iga1_fifo_high_threshold =
                            P880_IGA1_FIFO_HIGH_THRESHOLD;
                        iga1_display_queue_expire_num =
                            P880_IGA1_DISPLAY_QUEUE_EXPIRE_NUM;

                        /* If resolution > 1280x1024, expire length = 64, else
                           expire length = 128 */
                        if ((hor_active > 1280) && (ver_active > 1024))
                                iga1_display_queue_expire_num = 16;
                        else
                                iga1_display_queue_expire_num =
                                    P880_IGA1_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CN700) {
                        iga1_fifo_max_depth = CN700_IGA1_FIFO_MAX_DEPTH;
                        iga1_fifo_threshold = CN700_IGA1_FIFO_THRESHOLD;
                        iga1_fifo_high_threshold =
                            CN700_IGA1_FIFO_HIGH_THRESHOLD;

                        /* If resolution > 1280x1024, expire length = 64,
                           else expire length = 128 */
                        if ((hor_active > 1280) && (ver_active > 1024))
                                iga1_display_queue_expire_num = 16;
                        else
                                iga1_display_queue_expire_num =
                                    CN700_IGA1_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CX700) {
                        iga1_fifo_max_depth = CX700_IGA1_FIFO_MAX_DEPTH;
                        iga1_fifo_threshold = CX700_IGA1_FIFO_THRESHOLD;
                        iga1_fifo_high_threshold =
                            CX700_IGA1_FIFO_HIGH_THRESHOLD;
                        iga1_display_queue_expire_num =
                            CX700_IGA1_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_K8M890) {
                        iga1_fifo_max_depth = K8M890_IGA1_FIFO_MAX_DEPTH;
                        iga1_fifo_threshold = K8M890_IGA1_FIFO_THRESHOLD;
                        iga1_fifo_high_threshold =
                            K8M890_IGA1_FIFO_HIGH_THRESHOLD;
                        iga1_display_queue_expire_num =
                            K8M890_IGA1_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_P4M890) {
                        iga1_fifo_max_depth = P4M890_IGA1_FIFO_MAX_DEPTH;
                        iga1_fifo_threshold = P4M890_IGA1_FIFO_THRESHOLD;
                        iga1_fifo_high_threshold =
                            P4M890_IGA1_FIFO_HIGH_THRESHOLD;
                        iga1_display_queue_expire_num =
                            P4M890_IGA1_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_P4M900) {
                        iga1_fifo_max_depth = P4M900_IGA1_FIFO_MAX_DEPTH;
                        iga1_fifo_threshold = P4M900_IGA1_FIFO_THRESHOLD;
                        iga1_fifo_high_threshold =
                            P4M900_IGA1_FIFO_HIGH_THRESHOLD;
                        iga1_display_queue_expire_num =
                            P4M900_IGA1_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_VX800) {
                        iga1_fifo_max_depth = VX800_IGA1_FIFO_MAX_DEPTH;
                        iga1_fifo_threshold = VX800_IGA1_FIFO_THRESHOLD;
                        iga1_fifo_high_threshold =
                            VX800_IGA1_FIFO_HIGH_THRESHOLD;
                        iga1_display_queue_expire_num =
                            VX800_IGA1_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_VX855) {
                        iga1_fifo_max_depth = VX855_IGA1_FIFO_MAX_DEPTH;
                        iga1_fifo_threshold = VX855_IGA1_FIFO_THRESHOLD;
                        iga1_fifo_high_threshold =
                            VX855_IGA1_FIFO_HIGH_THRESHOLD;
                        iga1_display_queue_expire_num =
                            VX855_IGA1_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_VX900) {
                        iga1_fifo_max_depth = VX900_IGA1_FIFO_MAX_DEPTH;
                        iga1_fifo_threshold = VX900_IGA1_FIFO_THRESHOLD;
                        iga1_fifo_high_threshold =
                            VX900_IGA1_FIFO_HIGH_THRESHOLD;
                        iga1_display_queue_expire_num =
                            VX900_IGA1_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                /* Set Display FIFO Depath Select */
                reg_value = IGA1_FIFO_DEPTH_SELECT_FORMULA(iga1_fifo_max_depth);
                viafb_load_reg_num =
                    display_fifo_depth_reg.iga1_fifo_depth_select_reg.reg_num;
                reg = display_fifo_depth_reg.iga1_fifo_depth_select_reg.reg;
                viafb_load_reg(reg_value, viafb_load_reg_num, reg, VIASR);

                /* Set Display FIFO Threshold Select */
                reg_value = IGA1_FIFO_THRESHOLD_FORMULA(iga1_fifo_threshold);
                viafb_load_reg_num =
                    fifo_threshold_select_reg.
                    iga1_fifo_threshold_select_reg.reg_num;
                reg =
                    fifo_threshold_select_reg.
                    iga1_fifo_threshold_select_reg.reg;
                viafb_load_reg(reg_value, viafb_load_reg_num, reg, VIASR);

                /* Set FIFO High Threshold Select */
                reg_value =
                    IGA1_FIFO_HIGH_THRESHOLD_FORMULA(iga1_fifo_high_threshold);
                viafb_load_reg_num =
                    fifo_high_threshold_select_reg.
                    iga1_fifo_high_threshold_select_reg.reg_num;
                reg =
                    fifo_high_threshold_select_reg.
                    iga1_fifo_high_threshold_select_reg.reg;
                viafb_load_reg(reg_value, viafb_load_reg_num, reg, VIASR);

                /* Set Display Queue Expire Num */
                reg_value =
                    IGA1_DISPLAY_QUEUE_EXPIRE_NUM_FORMULA
                    (iga1_display_queue_expire_num);
                viafb_load_reg_num =
                    display_queue_expire_num_reg.
                    iga1_display_queue_expire_num_reg.reg_num;
                reg =
                    display_queue_expire_num_reg.
                    iga1_display_queue_expire_num_reg.reg;
                viafb_load_reg(reg_value, viafb_load_reg_num, reg, VIASR);

        } else {
                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_K800) {
                        iga2_fifo_max_depth = K800_IGA2_FIFO_MAX_DEPTH;
                        iga2_fifo_threshold = K800_IGA2_FIFO_THRESHOLD;
                        iga2_fifo_high_threshold =
                            K800_IGA2_FIFO_HIGH_THRESHOLD;

                        /* If resolution > 1280x1024, expire length = 64,
                           else  expire length = 128 */
                        if ((hor_active > 1280) && (ver_active > 1024))
                                iga2_display_queue_expire_num = 16;
                        else
                                iga2_display_queue_expire_num =
                                    K800_IGA2_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_PM800) {
                        iga2_fifo_max_depth = P880_IGA2_FIFO_MAX_DEPTH;
                        iga2_fifo_threshold = P880_IGA2_FIFO_THRESHOLD;
                        iga2_fifo_high_threshold =
                            P880_IGA2_FIFO_HIGH_THRESHOLD;

                        /* If resolution > 1280x1024, expire length = 64,
                           else  expire length = 128 */
                        if ((hor_active > 1280) && (ver_active > 1024))
                                iga2_display_queue_expire_num = 16;
                        else
                                iga2_display_queue_expire_num =
                                    P880_IGA2_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CN700) {
                        iga2_fifo_max_depth = CN700_IGA2_FIFO_MAX_DEPTH;
                        iga2_fifo_threshold = CN700_IGA2_FIFO_THRESHOLD;
                        iga2_fifo_high_threshold =
                            CN700_IGA2_FIFO_HIGH_THRESHOLD;

                        /* If resolution > 1280x1024, expire length = 64,
                           else expire length = 128 */
                        if ((hor_active > 1280) && (ver_active > 1024))
                                iga2_display_queue_expire_num = 16;
                        else
                                iga2_display_queue_expire_num =
                                    CN700_IGA2_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CX700) {
                        iga2_fifo_max_depth = CX700_IGA2_FIFO_MAX_DEPTH;
                        iga2_fifo_threshold = CX700_IGA2_FIFO_THRESHOLD;
                        iga2_fifo_high_threshold =
                            CX700_IGA2_FIFO_HIGH_THRESHOLD;
                        iga2_display_queue_expire_num =
                            CX700_IGA2_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_K8M890) {
                        iga2_fifo_max_depth = K8M890_IGA2_FIFO_MAX_DEPTH;
                        iga2_fifo_threshold = K8M890_IGA2_FIFO_THRESHOLD;
                        iga2_fifo_high_threshold =
                            K8M890_IGA2_FIFO_HIGH_THRESHOLD;
                        iga2_display_queue_expire_num =
                            K8M890_IGA2_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_P4M890) {
                        iga2_fifo_max_depth = P4M890_IGA2_FIFO_MAX_DEPTH;
                        iga2_fifo_threshold = P4M890_IGA2_FIFO_THRESHOLD;
                        iga2_fifo_high_threshold =
                            P4M890_IGA2_FIFO_HIGH_THRESHOLD;
                        iga2_display_queue_expire_num =
                            P4M890_IGA2_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_P4M900) {
                        iga2_fifo_max_depth = P4M900_IGA2_FIFO_MAX_DEPTH;
                        iga2_fifo_threshold = P4M900_IGA2_FIFO_THRESHOLD;
                        iga2_fifo_high_threshold =
                            P4M900_IGA2_FIFO_HIGH_THRESHOLD;
                        iga2_display_queue_expire_num =
                            P4M900_IGA2_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_VX800) {
                        iga2_fifo_max_depth = VX800_IGA2_FIFO_MAX_DEPTH;
                        iga2_fifo_threshold = VX800_IGA2_FIFO_THRESHOLD;
                        iga2_fifo_high_threshold =
                            VX800_IGA2_FIFO_HIGH_THRESHOLD;
                        iga2_display_queue_expire_num =
                            VX800_IGA2_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_VX855) {
                        iga2_fifo_max_depth = VX855_IGA2_FIFO_MAX_DEPTH;
                        iga2_fifo_threshold = VX855_IGA2_FIFO_THRESHOLD;
                        iga2_fifo_high_threshold =
                            VX855_IGA2_FIFO_HIGH_THRESHOLD;
                        iga2_display_queue_expire_num =
                            VX855_IGA2_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_VX900) {
                        iga2_fifo_max_depth = VX900_IGA2_FIFO_MAX_DEPTH;
                        iga2_fifo_threshold = VX900_IGA2_FIFO_THRESHOLD;
                        iga2_fifo_high_threshold =
                            VX900_IGA2_FIFO_HIGH_THRESHOLD;
                        iga2_display_queue_expire_num =
                            VX900_IGA2_DISPLAY_QUEUE_EXPIRE_NUM;
                }

                if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_K800) {
                        /* Set Display FIFO Depath Select */
                        reg_value =
                            IGA2_FIFO_DEPTH_SELECT_FORMULA(iga2_fifo_max_depth)
                            - 1;
                        /* Patch LCD in IGA2 case */
                        viafb_load_reg_num =
                            display_fifo_depth_reg.
                            iga2_fifo_depth_select_reg.reg_num;
                        reg =
                            display_fifo_depth_reg.
                            iga2_fifo_depth_select_reg.reg;
                        viafb_load_reg(reg_value,
                                viafb_load_reg_num, reg, VIACR);
                } else {

                        /* Set Display FIFO Depath Select */
                        reg_value =
                            IGA2_FIFO_DEPTH_SELECT_FORMULA(iga2_fifo_max_depth);
                        viafb_load_reg_num =
                            display_fifo_depth_reg.
                            iga2_fifo_depth_select_reg.reg_num;
                        reg =
                            display_fifo_depth_reg.
                            iga2_fifo_depth_select_reg.reg;
                        viafb_load_reg(reg_value,
                                viafb_load_reg_num, reg, VIACR);
                }

                /* Set Display FIFO Threshold Select */
                reg_value = IGA2_FIFO_THRESHOLD_FORMULA(iga2_fifo_threshold);
                viafb_load_reg_num =
                    fifo_threshold_select_reg.
                    iga2_fifo_threshold_select_reg.reg_num;
                reg =
                    fifo_threshold_select_reg.
                    iga2_fifo_threshold_select_reg.reg;
                viafb_load_reg(reg_value, viafb_load_reg_num, reg, VIACR);

                /* Set FIFO High Threshold Select */
                reg_value =
                    IGA2_FIFO_HIGH_THRESHOLD_FORMULA(iga2_fifo_high_threshold);
                viafb_load_reg_num =
                    fifo_high_threshold_select_reg.
                    iga2_fifo_high_threshold_select_reg.reg_num;
                reg =
                    fifo_high_threshold_select_reg.
                    iga2_fifo_high_threshold_select_reg.reg;
                viafb_load_reg(reg_value, viafb_load_reg_num, reg, VIACR);

                /* Set Display Queue Expire Num */
                reg_value =
                    IGA2_DISPLAY_QUEUE_EXPIRE_NUM_FORMULA
                    (iga2_display_queue_expire_num);
                viafb_load_reg_num =
                    display_queue_expire_num_reg.
                    iga2_display_queue_expire_num_reg.reg_num;
                reg =
                    display_queue_expire_num_reg.
                    iga2_display_queue_expire_num_reg.reg;
                viafb_load_reg(reg_value, viafb_load_reg_num, reg, VIACR);

        }

}

static struct via_pll_config get_pll_config(struct pll_limit *limits, int size,
        int clk)
{
        struct via_pll_config cur, up, down, best = {0, 1, 0};
        const u32 f0 = 14318180; /* X1 frequency */
        int i, f;

        for (i = 0; i < size; i++) {
                cur.rshift = limits[i].rshift;
                cur.divisor = limits[i].divisor;
                cur.multiplier = clk / ((f0 / cur.divisor)>>cur.rshift);
                f = abs(get_pll_output_frequency(f0, cur) - clk);
                up = down = cur;
                up.multiplier++;
                down.multiplier--;
                if (abs(get_pll_output_frequency(f0, up) - clk) < f)
                        cur = up;
                else if (abs(get_pll_output_frequency(f0, down) - clk) < f)
                        cur = down;

                if (cur.multiplier < limits[i].multiplier_min)
                        cur.multiplier = limits[i].multiplier_min;
                else if (cur.multiplier > limits[i].multiplier_max)
                        cur.multiplier = limits[i].multiplier_max;

                f = abs(get_pll_output_frequency(f0, cur) - clk);
                if (f < abs(get_pll_output_frequency(f0, best) - clk))
                        best = cur;
        }

        return best;
}

static struct via_pll_config get_best_pll_config(int clk)
{
        struct via_pll_config config;

        switch (viaparinfo->chip_info->gfx_chip_name) {
        case UNICHROME_CLE266:
        case UNICHROME_K400:
                config = get_pll_config(cle266_pll_limits,
                        ARRAY_SIZE(cle266_pll_limits), clk);
                break;
        case UNICHROME_K800:
        case UNICHROME_PM800:
        case UNICHROME_CN700:
                config = get_pll_config(k800_pll_limits,
                        ARRAY_SIZE(k800_pll_limits), clk);
                break;
        case UNICHROME_CX700:
        case UNICHROME_CN750:
        case UNICHROME_K8M890:
        case UNICHROME_P4M890:
        case UNICHROME_P4M900:
        case UNICHROME_VX800:
                config = get_pll_config(cx700_pll_limits,
                        ARRAY_SIZE(cx700_pll_limits), clk);
                break;
        case UNICHROME_VX855:
        case UNICHROME_VX900:
                config = get_pll_config(vx855_pll_limits,
                        ARRAY_SIZE(vx855_pll_limits), clk);
                break;
        }

        return config;
}

/* Set VCLK*/
void viafb_set_vclock(u32 clk, int set_iga)
{
        struct via_pll_config config = get_best_pll_config(clk);

        if (set_iga == IGA1)
                clock.set_primary_pll(config);
        if (set_iga == IGA2)
                clock.set_secondary_pll(config);

        /* Fire! */
        via_write_misc_reg_mask(0x0C, 0x0C); /* select external clock */
}

struct via_display_timing var_to_timing(const struct fb_var_screeninfo *var,
        u16 cxres, u16 cyres)
{
        struct via_display_timing timing;
        u16 dx = (var->xres - cxres) / 2, dy = (var->yres - cyres) / 2;

        timing.hor_addr = cxres;
        timing.hor_sync_start = timing.hor_addr + var->right_margin + dx;
        timing.hor_sync_end = timing.hor_sync_start + var->hsync_len;
        timing.hor_total = timing.hor_sync_end + var->left_margin + dx;
        timing.hor_blank_start = timing.hor_addr + dx;
        timing.hor_blank_end = timing.hor_total - dx;
        timing.ver_addr = cyres;
        timing.ver_sync_start = timing.ver_addr + var->lower_margin + dy;
        timing.ver_sync_end = timing.ver_sync_start + var->vsync_len;
        timing.ver_total = timing.ver_sync_end + var->upper_margin + dy;
        timing.ver_blank_start = timing.ver_addr + dy;
        timing.ver_blank_end = timing.ver_total - dy;
        return timing;
}

void viafb_fill_crtc_timing(const struct fb_var_screeninfo *var,
        u16 cxres, u16 cyres, int iga)
{
        struct via_display_timing crt_reg = var_to_timing(var,
                cxres ? cxres : var->xres, cyres ? cyres : var->yres);

        if (iga == IGA1)
                via_set_primary_timing(&crt_reg);
        else if (iga == IGA2)
                via_set_secondary_timing(&crt_reg);

        viafb_load_fetch_count_reg(var->xres, var->bits_per_pixel / 8, iga);
        if (viaparinfo->chip_info->gfx_chip_name != UNICHROME_CLE266
                && viaparinfo->chip_info->gfx_chip_name != UNICHROME_K400)
                viafb_load_FIFO_reg(iga, var->xres, var->yres);

        viafb_set_vclock(PICOS2KHZ(var->pixclock) * 1000, iga);
}

void viafb_init_chip_info(int chip_type)
{
        via_clock_init(&clock, chip_type);
        init_gfx_chip_info(chip_type);
        init_tmds_chip_info();
        init_lvds_chip_info();

        /*Set IGA path for each device */
        viafb_set_iga_path();

        viaparinfo->lvds_setting_info->display_method = viafb_lcd_dsp_method;
        viaparinfo->lvds_setting_info->lcd_mode = viafb_lcd_mode;
        viaparinfo->lvds_setting_info2->display_method =
                viaparinfo->lvds_setting_info->display_method;
        viaparinfo->lvds_setting_info2->lcd_mode =
                viaparinfo->lvds_setting_info->lcd_mode;
}

void viafb_update_device_setting(int hres, int vres, int bpp, int flag)
{
        if (flag == 0) {
                viaparinfo->tmds_setting_info->h_active = hres;
                viaparinfo->tmds_setting_info->v_active = vres;
        } else {

                if (viaparinfo->tmds_setting_info->iga_path == IGA2) {
                        viaparinfo->tmds_setting_info->h_active = hres;
                        viaparinfo->tmds_setting_info->v_active = vres;
                }

        }
}

static void init_gfx_chip_info(int chip_type)
{
        u8 tmp;

        viaparinfo->chip_info->gfx_chip_name = chip_type;

        /* Check revision of CLE266 Chip */
        if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CLE266) {
                /* CR4F only define in CLE266.CX chip */
                tmp = viafb_read_reg(VIACR, CR4F);
                viafb_write_reg(CR4F, VIACR, 0x55);
                if (viafb_read_reg(VIACR, CR4F) != 0x55)
                        viaparinfo->chip_info->gfx_chip_revision =
                        CLE266_REVISION_AX;
                else
                        viaparinfo->chip_info->gfx_chip_revision =
                        CLE266_REVISION_CX;
                /* restore orignal CR4F value */
                viafb_write_reg(CR4F, VIACR, tmp);
        }

        if (viaparinfo->chip_info->gfx_chip_name == UNICHROME_CX700) {
                tmp = viafb_read_reg(VIASR, SR43);
                DEBUG_MSG(KERN_INFO "SR43:%X\n", tmp);
                if (tmp & 0x02) {
                        viaparinfo->chip_info->gfx_chip_revision =
                                CX700_REVISION_700M2;
                } else if (tmp & 0x40) {
                        viaparinfo->chip_info->gfx_chip_revision =
                                CX700_REVISION_700M;
                } else {
                        viaparinfo->chip_info->gfx_chip_revision =
                                CX700_REVISION_700;
                }
        }

        /* Determine which 2D engine we have */
        switch (viaparinfo->chip_info->gfx_chip_name) {
        case UNICHROME_VX800:
        case UNICHROME_VX855:
        case UNICHROME_VX900:
                viaparinfo->chip_info->twod_engine = VIA_2D_ENG_M1;
                break;
        case UNICHROME_K8M890:
        case UNICHROME_P4M900:
                viaparinfo->chip_info->twod_engine = VIA_2D_ENG_H5;
                break;
        default:
                viaparinfo->chip_info->twod_engine = VIA_2D_ENG_H2;
                break;
        }
}

static void init_tmds_chip_info(void)
{
        viafb_tmds_trasmitter_identify();

        if (INTERFACE_NONE == viaparinfo->chip_info->tmds_chip_info.
                output_interface) {
                switch (viaparinfo->chip_info->gfx_chip_name) {
                case UNICHROME_CX700:
                        {
                                /* we should check support by hardware layout.*/
                                if ((viafb_display_hardware_layout ==
                                     HW_LAYOUT_DVI_ONLY)
                                    || (viafb_display_hardware_layout ==
                                        HW_LAYOUT_LCD_DVI)) {
                                        viaparinfo->chip_info->tmds_chip_info.
                                            output_interface = INTERFACE_TMDS;
                                } else {
                                        viaparinfo->chip_info->tmds_chip_info.
                                                output_interface =
                                                INTERFACE_NONE;
                                }
                                break;
                        }
                case UNICHROME_K8M890:
                case UNICHROME_P4M900:
                case UNICHROME_P4M890:
                        /* TMDS on PCIE, we set DFPLOW as default. */
                        viaparinfo->chip_info->tmds_chip_info.output_interface =
                            INTERFACE_DFP_LOW;
                        break;
                default:
                        {
                                /* set DVP1 default for DVI */
                                viaparinfo->chip_info->tmds_chip_info
                                .output_interface = INTERFACE_DVP1;
                        }
                }
        }

        DEBUG_MSG(KERN_INFO "TMDS Chip = %d\n",
                  viaparinfo->chip_info->tmds_chip_info.tmds_chip_name);
        viafb_init_dvi_size(&viaparinfo->shared->chip_info.tmds_chip_info,
                &viaparinfo->shared->tmds_setting_info);
}

static void init_lvds_chip_info(void)
{
        viafb_lvds_trasmitter_identify();
        viafb_init_lcd_size();
        viafb_init_lvds_output_interface(&viaparinfo->chip_info->lvds_chip_info,
                                   viaparinfo->lvds_setting_info);
        if (viaparinfo->chip_info->lvds_chip_info2.lvds_chip_name) {
                viafb_init_lvds_output_interface(&viaparinfo->chip_info->
                        lvds_chip_info2, viaparinfo->lvds_setting_info2);
        }
        /*If CX700,two singel LCD, we need to reassign
           LCD interface to different LVDS port */
        if ((UNICHROME_CX700 == viaparinfo->chip_info->gfx_chip_name)
            && (HW_LAYOUT_LCD1_LCD2 == viafb_display_hardware_layout)) {
                if ((INTEGRATED_LVDS == viaparinfo->chip_info->lvds_chip_info.
                        lvds_chip_name) && (INTEGRATED_LVDS ==
                        viaparinfo->chip_info->
                        lvds_chip_info2.lvds_chip_name)) {
                        viaparinfo->chip_info->lvds_chip_info.output_interface =
                                INTERFACE_LVDS0;
                        viaparinfo->chip_info->lvds_chip_info2.
                                output_interface =
                            INTERFACE_LVDS1;
                }
        }

        DEBUG_MSG(KERN_INFO "LVDS Chip = %d\n",
                  viaparinfo->chip_info->lvds_chip_info.lvds_chip_name);
        DEBUG_MSG(KERN_INFO "LVDS1 output_interface = %d\n",
                  viaparinfo->chip_info->lvds_chip_info.output_interface);
        DEBUG_MSG(KERN_INFO "LVDS2 output_interface = %d\n",
                  viaparinfo->chip_info->lvds_chip_info.output_interface);
}

void viafb_init_dac(int set_iga)
{
        int i;
        u8 tmp;

        if (set_iga == IGA1) {
                /* access Primary Display's LUT */
                viafb_write_reg_mask(SR1A, VIASR, 0x00, BIT0);
                /* turn off LCK */
                viafb_write_reg_mask(SR1B, VIASR, 0x00, BIT7 + BIT6);
                for (i = 0; i < 256; i++) {
                        write_dac_reg(i, palLUT_table[i].red,
                                      palLUT_table[i].green,
                                      palLUT_table[i].blue);
                }
                /* turn on LCK */
                viafb_write_reg_mask(SR1B, VIASR, 0xC0, BIT7 + BIT6);
        } else {
                tmp = viafb_read_reg(VIACR, CR6A);
                /* access Secondary Display's LUT */
                viafb_write_reg_mask(CR6A, VIACR, 0x40, BIT6);
                viafb_write_reg_mask(SR1A, VIASR, 0x01, BIT0);
                for (i = 0; i < 256; i++) {
                        write_dac_reg(i, palLUT_table[i].red,
                                      palLUT_table[i].green,
                                      palLUT_table[i].blue);
                }
                /* set IGA1 DAC for default */
                viafb_write_reg_mask(SR1A, VIASR, 0x00, BIT0);
                viafb_write_reg(CR6A, VIACR, tmp);
        }
}

static void device_screen_off(void)
{
        /* turn off CRT screen (IGA1) */
        viafb_write_reg_mask(SR01, VIASR, 0x20, BIT5);
}

static void device_screen_on(void)
{
        /* turn on CRT screen (IGA1) */
        viafb_write_reg_mask(SR01, VIASR, 0x00, BIT5);
}

static void set_display_channel(void)
{
        /*If viafb_LCD2_ON, on cx700, internal lvds's information
        is keeped on lvds_setting_info2 */
        if (viafb_LCD2_ON &&
                viaparinfo->lvds_setting_info2->device_lcd_dualedge) {
                /* For dual channel LCD: */
                /* Set to Dual LVDS channel. */
                viafb_write_reg_mask(CRD2, VIACR, 0x20, BIT4 + BIT5);
        } else if (viafb_LCD_ON && viafb_DVI_ON) {
                /* For LCD+DFP: */
                /* Set to LVDS1 + TMDS channel. */
                viafb_write_reg_mask(CRD2, VIACR, 0x10, BIT4 + BIT5);
        } else if (viafb_DVI_ON) {
                /* Set to single TMDS channel. */
                viafb_write_reg_mask(CRD2, VIACR, 0x30, BIT4 + BIT5);
        } else if (viafb_LCD_ON) {
                if (viaparinfo->lvds_setting_info->device_lcd_dualedge) {
                        /* For dual channel LCD: */
                        /* Set to Dual LVDS channel. */
                        viafb_write_reg_mask(CRD2, VIACR, 0x20, BIT4 + BIT5);
                } else {
                        /* Set to LVDS0 + LVDS1 channel. */
                        viafb_write_reg_mask(CRD2, VIACR, 0x00, BIT4 + BIT5);
                }
        }
}

static u8 get_sync(struct fb_var_screeninfo *var)
{
        u8 polarity = 0;

        if (!(var->sync & FB_SYNC_HOR_HIGH_ACT))
                polarity |= VIA_HSYNC_NEGATIVE;
        if (!(var->sync & FB_SYNC_VERT_HIGH_ACT))
                polarity |= VIA_VSYNC_NEGATIVE;
        return polarity;
}

static void hw_init(void)
{
        int i;

        inb(VIAStatus);
        outb(0x00, VIAAR);

        /* Write Common Setting for Video Mode */
        viafb_write_regx(common_vga, ARRAY_SIZE(common_vga));
        switch (viaparinfo->chip_info->gfx_chip_name) {
        case UNICHROME_CLE266:
                viafb_write_regx(CLE266_ModeXregs, NUM_TOTAL_CLE266_ModeXregs);
                break;

        case UNICHROME_K400:
                viafb_write_regx(KM400_ModeXregs, NUM_TOTAL_KM400_ModeXregs);
                break;

        case UNICHROME_K800:
        case UNICHROME_PM800:
                viafb_write_regx(CN400_ModeXregs, NUM_TOTAL_CN400_ModeXregs);
                break;

        case UNICHROME_CN700:
        case UNICHROME_K8M890:
        case UNICHROME_P4M890:
        case UNICHROME_P4M900:
                viafb_write_regx(CN700_ModeXregs, NUM_TOTAL_CN700_ModeXregs);
                break;

        case UNICHROME_CX700:
        case UNICHROME_VX800:
                viafb_write_regx(CX700_ModeXregs, NUM_TOTAL_CX700_ModeXregs);
                break;

        case UNICHROME_VX855:
        case UNICHROME_VX900:
                viafb_write_regx(VX855_ModeXregs, NUM_TOTAL_VX855_ModeXregs);
                break;
        }

        /* magic required on VX900 for correct modesetting on IGA1 */
        via_write_reg_mask(VIACR, 0x45, 0x00, 0x01);

        /* probably this should go to the scaling code one day */
        via_write_reg_mask(VIACR, 0xFD, 0, 0x80); /* VX900 hw scale on IGA2 */
        viafb_write_regx(scaling_parameters, ARRAY_SIZE(scaling_parameters));

        /* Fill VPIT Parameters */
        /* Write Misc Register */
        outb(VPIT.Misc, VIA_MISC_REG_WRITE);

        /* Write Sequencer */
        for (i = 1; i <= StdSR; i++)
                via_write_reg(VIASR, i, VPIT.SR[i - 1]);

        viafb_write_reg_mask(0x15, VIASR, 0xA2, 0xA2);

        /* Write Graphic Controller */
        for (i = 0; i < StdGR; i++)
                via_write_reg(VIAGR, i, VPIT.GR[i]);

        /* Write Attribute Controller */
        for (i = 0; i < StdAR; i++) {
                inb(VIAStatus);
                outb(i, VIAAR);
                outb(VPIT.AR[i], VIAAR);
        }

        inb(VIAStatus);
        outb(0x20, VIAAR);

        load_fix_bit_crtc_reg();
}

int viafb_setmode(void)
{
        int j, cxres = 0, cyres = 0;
        int port;
        u32 devices = viaparinfo->shared->iga1_devices
                | viaparinfo->shared->iga2_devices;
        u8 value, index, mask;
        struct fb_var_screeninfo var2;

        device_screen_off();
        device_off();
        via_set_state(devices, VIA_STATE_OFF);

        hw_init();

        /* Update Patch Register */

        if ((viaparinfo->chip_info->gfx_chip_name == UNICHROME_CLE266
                || viaparinfo->chip_info->gfx_chip_name == UNICHROME_K400)
                && viafbinfo->var.xres == 1024 && viafbinfo->var.yres == 768) {
                for (j = 0; j < res_patch_table[0].table_length; j++) {
                        index = res_patch_table[0].io_reg_table[j].index;
                        port = res_patch_table[0].io_reg_table[j].port;
                        value = res_patch_table[0].io_reg_table[j].value;
                        mask = res_patch_table[0].io_reg_table[j].mask;
                        viafb_write_reg_mask(index, port, value, mask);
                }
        }

        via_set_primary_pitch(viafbinfo->fix.line_length);
        via_set_secondary_pitch(viafb_dual_fb ? viafbinfo1->fix.line_length
                : viafbinfo->fix.line_length);
        via_set_primary_color_depth(viaparinfo->depth);
        via_set_secondary_color_depth(viafb_dual_fb ? viaparinfo1->depth
                : viaparinfo->depth);
        via_set_source(viaparinfo->shared->iga1_devices, IGA1);
        via_set_source(viaparinfo->shared->iga2_devices, IGA2);
        if (viaparinfo->shared->iga2_devices)
                enable_second_display_channel();
        else
                disable_second_display_channel();

        /* Update Refresh Rate Setting */

        /* Clear On Screen */

        if (viafb_dual_fb) {
                var2 = viafbinfo1->var;
        } else if (viafb_SAMM_ON) {
                viafb_fill_var_timing_info(&var2, viafb_get_best_mode(
                        viafb_second_xres, viafb_second_yres, viafb_refresh1));
                cxres = viafbinfo->var.xres;
                cyres = viafbinfo->var.yres;
                var2.bits_per_pixel = viafbinfo->var.bits_per_pixel;
        }

        /* CRT set mode */
        if (viafb_CRT_ON) {
                if (viaparinfo->shared->iga2_devices & VIA_CRT
                        && viafb_SAMM_ON)
                        viafb_fill_crtc_timing(&var2, cxres, cyres, IGA2);
                else
                        viafb_fill_crtc_timing(&viafbinfo->var, 0, 0,
                                (viaparinfo->shared->iga1_devices & VIA_CRT)
                                ? IGA1 : IGA2);

                /* Patch if set_hres is not 8 alignment (1366) to viafb_setmode
                to 8 alignment (1368),there is several pixels (2 pixels)
                on right side of screen. */
                if (viafbinfo->var.xres % 8) {
                        viafb_unlock_crt();
                        viafb_write_reg(CR02, VIACR,
                                viafb_read_reg(VIACR, CR02) - 1);
                        viafb_lock_crt();
                }
        }

        if (viafb_DVI_ON) {
                if (viaparinfo->shared->tmds_setting_info.iga_path == IGA2
                        && viafb_SAMM_ON)
                        viafb_dvi_set_mode(&var2, cxres, cyres, IGA2);
                else
                        viafb_dvi_set_mode(&viafbinfo->var, 0, 0,
                                viaparinfo->tmds_setting_info->iga_path);
        }

        if (viafb_LCD_ON) {
                if (viafb_SAMM_ON &&
                        (viaparinfo->lvds_setting_info->iga_path == IGA2)) {
                        viafb_lcd_set_mode(&var2, cxres, cyres,
                                viaparinfo->lvds_setting_info,
                                &viaparinfo->chip_info->lvds_chip_info);
                } else {
                        /* IGA1 doesn't have LCD scaling, so set it center. */
                        if (viaparinfo->lvds_setting_info->iga_path == IGA1) {
                                viaparinfo->lvds_setting_info->display_method =
                                    LCD_CENTERING;
                        }
                        viafb_lcd_set_mode(&viafbinfo->var, 0, 0,
                                viaparinfo->lvds_setting_info,
                                &viaparinfo->chip_info->lvds_chip_info);
                }
        }
        if (viafb_LCD2_ON) {
                if (viafb_SAMM_ON &&
                        (viaparinfo->lvds_setting_info2->iga_path == IGA2)) {
                        viafb_lcd_set_mode(&var2, cxres, cyres,
                                viaparinfo->lvds_setting_info2,
                                &viaparinfo->chip_info->lvds_chip_info2);
                } else {
                        /* IGA1 doesn't have LCD scaling, so set it center. */
                        if (viaparinfo->lvds_setting_info2->iga_path == IGA1) {
                                viaparinfo->lvds_setting_info2->display_method =
                                    LCD_CENTERING;
                        }
                        viafb_lcd_set_mode(&viafbinfo->var, 0, 0,
                                viaparinfo->lvds_setting_info2,
                                &viaparinfo->chip_info->lvds_chip_info2);
                }
        }

        if ((viaparinfo->chip_info->gfx_chip_name == UNICHROME_CX700)
            && (viafb_LCD_ON || viafb_DVI_ON))
                set_display_channel();

        /* If set mode normally, save resolution information for hot-plug . */
        if (!viafb_hotplug) {
                viafb_hotplug_Xres = viafbinfo->var.xres;
                viafb_hotplug_Yres = viafbinfo->var.yres;
                viafb_hotplug_bpp = viafbinfo->var.bits_per_pixel;
                viafb_hotplug_refresh = viafb_refresh;

                if (viafb_DVI_ON)
                        viafb_DeviceStatus = DVI_Device;
                else
                        viafb_DeviceStatus = CRT_Device;
        }
        device_on();
        if (!viafb_SAMM_ON)
                via_set_sync_polarity(devices, get_sync(&viafbinfo->var));
        else {
                via_set_sync_polarity(viaparinfo->shared->iga1_devices,
                        get_sync(&viafbinfo->var));
                via_set_sync_polarity(viaparinfo->shared->iga2_devices,
                        get_sync(&var2));
        }

        clock.set_engine_pll_state(VIA_STATE_ON);
        clock.set_primary_clock_source(VIA_CLKSRC_X1, true);
        clock.set_secondary_clock_source(VIA_CLKSRC_X1, true);

#ifdef CONFIG_FB_VIA_X_COMPATIBILITY
        clock.set_primary_pll_state(VIA_STATE_ON);
        clock.set_primary_clock_state(VIA_STATE_ON);
        clock.set_secondary_pll_state(VIA_STATE_ON);
        clock.set_secondary_clock_state(VIA_STATE_ON);
#else
        if (viaparinfo->shared->iga1_devices) {
                clock.set_primary_pll_state(VIA_STATE_ON);
                clock.set_primary_clock_state(VIA_STATE_ON);
        } else {
                clock.set_primary_pll_state(VIA_STATE_OFF);
                clock.set_primary_clock_state(VIA_STATE_OFF);
        }

        if (viaparinfo->shared->iga2_devices) {
                clock.set_secondary_pll_state(VIA_STATE_ON);
                clock.set_secondary_clock_state(VIA_STATE_ON);

        } else {
                clock.set_secondary_pll_state(VIA_STATE_OFF);
                clock.set_secondary_clock_state(VIA_STATE_OFF);
        }
#endif /*CONFIG_FB_VIA_X_COMPATIBILITY*/

        via_set_state(devices, VIA_STATE_ON);
        device_screen_on();
        return 1;
}

int viafb_get_refresh(int hres, int vres, u32 long_refresh)
{
        const struct fb_videomode *best;

        best = viafb_get_best_mode(hres, vres, long_refresh);
        if (!best)
                return 60;

        if (abs(best->refresh - long_refresh) > 3) {
                if (hres == 1200 && vres == 900)
                        return 49; /* OLPC DCON only supports 50 Hz */
                else
                        return 60;
        }

        return best->refresh;
}

static void device_off(void)
{
        viafb_dvi_disable();
        viafb_lcd_disable();
}

static void device_on(void)
{
        if (viafb_DVI_ON == 1)
                viafb_dvi_enable();
        if (viafb_LCD_ON == 1)
                viafb_lcd_enable();
}

static void enable_second_display_channel(void)
{
        /* to enable second display channel. */
        viafb_write_reg_mask(CR6A, VIACR, 0x00, BIT6);
        viafb_write_reg_mask(CR6A, VIACR, BIT7, BIT7);
        viafb_write_reg_mask(CR6A, VIACR, BIT6, BIT6);
}

static void disable_second_display_channel(void)
{
        /* to disable second display channel. */
        viafb_write_reg_mask(CR6A, VIACR, 0x00, BIT6);
        viafb_write_reg_mask(CR6A, VIACR, 0x00, BIT7);
        viafb_write_reg_mask(CR6A, VIACR, BIT6, BIT6);
}

void viafb_set_dpa_gfx(int output_interface, struct GFX_DPA_SETTING\
                                        *p_gfx_dpa_setting)
{
        switch (output_interface) {
        case INTERFACE_DVP0:
                {
                        /* DVP0 Clock Polarity and Adjust: */
                        viafb_write_reg_mask(CR96, VIACR,
                                       p_gfx_dpa_setting->DVP0, 0x0F);

                        /* DVP0 Clock and Data Pads Driving: */
                        viafb_write_reg_mask(SR1E, VIASR,
                                       p_gfx_dpa_setting->DVP0ClockDri_S, BIT2);
                        viafb_write_reg_mask(SR2A, VIASR,
                                       p_gfx_dpa_setting->DVP0ClockDri_S1,
                                       BIT4);
                        viafb_write_reg_mask(SR1B, VIASR,
                                       p_gfx_dpa_setting->DVP0DataDri_S, BIT1);
                        viafb_write_reg_mask(SR2A, VIASR,
                                       p_gfx_dpa_setting->DVP0DataDri_S1, BIT5);
                        break;
                }

        case INTERFACE_DVP1:
                {
                        /* DVP1 Clock Polarity and Adjust: */
                        viafb_write_reg_mask(CR9B, VIACR,
                                       p_gfx_dpa_setting->DVP1, 0x0F);

                        /* DVP1 Clock and Data Pads Driving: */
                        viafb_write_reg_mask(SR65, VIASR,
                                       p_gfx_dpa_setting->DVP1Driving, 0x0F);
                        break;
                }

        case INTERFACE_DFP_HIGH:
                {
                        viafb_write_reg_mask(CR97, VIACR,
                                       p_gfx_dpa_setting->DFPHigh, 0x0F);
                        break;
                }

        case INTERFACE_DFP_LOW:
                {
                        viafb_write_reg_mask(CR99, VIACR,
                                       p_gfx_dpa_setting->DFPLow, 0x0F);
                        break;
                }

        case INTERFACE_DFP:
                {
                        viafb_write_reg_mask(CR97, VIACR,
                                       p_gfx_dpa_setting->DFPHigh, 0x0F);
                        viafb_write_reg_mask(CR99, VIACR,
                                       p_gfx_dpa_setting->DFPLow, 0x0F);
                        break;
                }
        }
}

void viafb_fill_var_timing_info(struct fb_var_screeninfo *var,
        const struct fb_videomode *mode)
{
        var->pixclock = mode->pixclock;
        var->xres = mode->xres;
        var->yres = mode->yres;
        var->left_margin = mode->left_margin;
        var->right_margin = mode->right_margin;
        var->hsync_len = mode->hsync_len;
        var->upper_margin = mode->upper_margin;
        var->lower_margin = mode->lower_margin;
        var->vsync_len = mode->vsync_len;
        var->sync = mode->sync;
}