// SPDX-License-Identifier: GPL-2.0-only
/*
 * Frame buffer driver for Trident TGUI, Blade and Image series
 *
 * Copyright 2001, 2002 - Jani Monoses   <jani@iv.ro>
 * Copyright 2009 Krzysztof Helt <krzysztof.h1@wp.pl>
 *
 * CREDITS:(in order of appearance)
 *      skeletonfb.c by Geert Uytterhoeven and other fb code in drivers/video
 *      Special thanks ;) to Mattia Crivellini <tia@mclink.it>
 *      much inspired by the XFree86 4.x Trident driver sources
 *      by Alan Hourihane the FreeVGA project
 *      Francesco Salvestrini <salvestrini@users.sf.net> XP support,
 *      code, suggestions
 * TODO:
 *      timing value tweaking so it looks good on every monitor in every mode
 */

#include <linux/module.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/slab.h>

#include <linux/delay.h>
#include <video/vga.h>
#include <video/trident.h>

#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>

struct tridentfb_par {
        void __iomem *io_virt;  /* iospace virtual memory address */
        u32 pseudo_pal[16];
        int chip_id;
        int flatpanel;
        void (*init_accel) (struct tridentfb_par *, int, int);
        void (*wait_engine) (struct tridentfb_par *);
        void (*fill_rect)
                (struct tridentfb_par *par, u32, u32, u32, u32, u32, u32);
        void (*copy_rect)
                (struct tridentfb_par *par, u32, u32, u32, u32, u32, u32);
        void (*image_blit)
                (struct tridentfb_par *par, const char*,
                 u32, u32, u32, u32, u32, u32);
        unsigned char eng_oper; /* engine operation... */
        bool ddc_registered;
        struct i2c_adapter ddc_adapter;
        struct i2c_algo_bit_data ddc_algo;
};

static struct fb_fix_screeninfo tridentfb_fix = {
        .id = "Trident",
        .type = FB_TYPE_PACKED_PIXELS,
        .ypanstep = 1,
        .visual = FB_VISUAL_PSEUDOCOLOR,
        .accel = FB_ACCEL_NONE,
};

/* defaults which are normally overriden by user values */

/* video mode */
static char *mode_option;
static int bpp = 8;

static int noaccel;

static int center;
static int stretch;

static int fp;
static int crt;

static int memsize;
static int memdiff;
static int nativex;

module_param(mode_option, charp, 0);
MODULE_PARM_DESC(mode_option, "Initial video mode e.g. '648x480-8@60'");
module_param_named(mode, mode_option, charp, 0);
MODULE_PARM_DESC(mode, "Initial video mode e.g. '648x480-8@60' (deprecated)");
module_param(bpp, int, 0);
module_param(center, int, 0);
module_param(stretch, int, 0);
module_param(noaccel, int, 0);
module_param(memsize, int, 0);
module_param(memdiff, int, 0);
module_param(nativex, int, 0);
module_param(fp, int, 0);
MODULE_PARM_DESC(fp, "Define if flatpanel is connected");
module_param(crt, int, 0);
MODULE_PARM_DESC(crt, "Define if CRT is connected");

static inline int is_oldclock(int id)
{
        return  (id == TGUI9440) ||
                (id == TGUI9660) ||
                (id == CYBER9320);
}

static inline int is_oldprotect(int id)
{
        return  is_oldclock(id) ||
                (id == PROVIDIA9685) ||
                (id == CYBER9382) ||
                (id == CYBER9385);
}

static inline int is_blade(int id)
{
        return  (id == BLADE3D) ||
                (id == CYBERBLADEE4) ||
                (id == CYBERBLADEi7) ||
                (id == CYBERBLADEi7D) ||
                (id == CYBERBLADEi1) ||
                (id == CYBERBLADEi1D) ||
                (id == CYBERBLADEAi1) ||
                (id == CYBERBLADEAi1D);
}

static inline int is_xp(int id)
{
        return  (id == CYBERBLADEXPAi1) ||
                (id == CYBERBLADEXPm8) ||
                (id == CYBERBLADEXPm16);
}

static inline int is3Dchip(int id)
{
        return  is_blade(id) || is_xp(id) ||
                (id == CYBER9397) || (id == CYBER9397DVD) ||
                (id == CYBER9520) || (id == CYBER9525DVD) ||
                (id == IMAGE975) || (id == IMAGE985);
}

static inline int iscyber(int id)
{
        switch (id) {
        case CYBER9388:
        case CYBER9382:
        case CYBER9385:
        case CYBER9397:
        case CYBER9397DVD:
        case CYBER9520:
        case CYBER9525DVD:
        case CYBERBLADEE4:
        case CYBERBLADEi7D:
        case CYBERBLADEi1:
        case CYBERBLADEi1D:
        case CYBERBLADEAi1:
        case CYBERBLADEAi1D:
        case CYBERBLADEXPAi1:
                return 1;

        case CYBER9320:
        case CYBERBLADEi7:      /* VIA MPV4 integrated version */
        default:
                /* case CYBERBLDAEXPm8:  Strange */
                /* case CYBERBLDAEXPm16: Strange */
                return 0;
        }
}

static inline void t_outb(struct tridentfb_par *p, u8 val, u16 reg)
{
        fb_writeb(val, p->io_virt + reg);
}

static inline u8 t_inb(struct tridentfb_par *p, u16 reg)
{
        return fb_readb(p->io_virt + reg);
}

static inline void writemmr(struct tridentfb_par *par, u16 r, u32 v)
{
        fb_writel(v, par->io_virt + r);
}

static inline u32 readmmr(struct tridentfb_par *par, u16 r)
{
        return fb_readl(par->io_virt + r);
}

#define DDC_SDA_TGUI            BIT(0)
#define DDC_SCL_TGUI            BIT(1)
#define DDC_SCL_DRIVE_TGUI      BIT(2)
#define DDC_SDA_DRIVE_TGUI      BIT(3)
#define DDC_MASK_TGUI           (DDC_SCL_DRIVE_TGUI | DDC_SDA_DRIVE_TGUI)

static void tridentfb_ddc_setscl_tgui(void *data, int val)
{
        struct tridentfb_par *par = data;
        u8 reg = vga_mm_rcrt(par->io_virt, I2C) & DDC_MASK_TGUI;

        if (val)
                reg &= ~DDC_SCL_DRIVE_TGUI; /* disable drive - don't drive hi */
        else
                reg |= DDC_SCL_DRIVE_TGUI; /* drive low */

        vga_mm_wcrt(par->io_virt, I2C, reg);
}

static void tridentfb_ddc_setsda_tgui(void *data, int val)
{
        struct tridentfb_par *par = data;
        u8 reg = vga_mm_rcrt(par->io_virt, I2C) & DDC_MASK_TGUI;

        if (val)
                reg &= ~DDC_SDA_DRIVE_TGUI; /* disable drive - don't drive hi */
        else
                reg |= DDC_SDA_DRIVE_TGUI; /* drive low */

        vga_mm_wcrt(par->io_virt, I2C, reg);
}

static int tridentfb_ddc_getsda_tgui(void *data)
{
        struct tridentfb_par *par = data;

        return !!(vga_mm_rcrt(par->io_virt, I2C) & DDC_SDA_TGUI);
}

#define DDC_SDA_IN      BIT(0)
#define DDC_SCL_OUT     BIT(1)
#define DDC_SDA_OUT     BIT(3)
#define DDC_SCL_IN      BIT(6)
#define DDC_MASK        (DDC_SCL_OUT | DDC_SDA_OUT)

static void tridentfb_ddc_setscl(void *data, int val)
{
        struct tridentfb_par *par = data;
        unsigned char reg;

        reg = vga_mm_rcrt(par->io_virt, I2C) & DDC_MASK;
        if (val)
                reg |= DDC_SCL_OUT;
        else
                reg &= ~DDC_SCL_OUT;
        vga_mm_wcrt(par->io_virt, I2C, reg);
}

static void tridentfb_ddc_setsda(void *data, int val)
{
        struct tridentfb_par *par = data;
        unsigned char reg;

        reg = vga_mm_rcrt(par->io_virt, I2C) & DDC_MASK;
        if (!val)
                reg |= DDC_SDA_OUT;
        else
                reg &= ~DDC_SDA_OUT;
        vga_mm_wcrt(par->io_virt, I2C, reg);
}

static int tridentfb_ddc_getscl(void *data)
{
        struct tridentfb_par *par = data;

        return !!(vga_mm_rcrt(par->io_virt, I2C) & DDC_SCL_IN);
}

static int tridentfb_ddc_getsda(void *data)
{
        struct tridentfb_par *par = data;

        return !!(vga_mm_rcrt(par->io_virt, I2C) & DDC_SDA_IN);
}

static int tridentfb_setup_ddc_bus(struct fb_info *info)
{
        struct tridentfb_par *par = info->par;

        strlcpy(par->ddc_adapter.name, info->fix.id,
                sizeof(par->ddc_adapter.name));
        par->ddc_adapter.owner          = THIS_MODULE;
        par->ddc_adapter.class          = I2C_CLASS_DDC;
        par->ddc_adapter.algo_data      = &par->ddc_algo;
        par->ddc_adapter.dev.parent     = info->device;
        if (is_oldclock(par->chip_id)) { /* not sure if this check is OK */
                par->ddc_algo.setsda    = tridentfb_ddc_setsda_tgui;
                par->ddc_algo.setscl    = tridentfb_ddc_setscl_tgui;
                par->ddc_algo.getsda    = tridentfb_ddc_getsda_tgui;
                /* no getscl */
        } else {
                par->ddc_algo.setsda    = tridentfb_ddc_setsda;
                par->ddc_algo.setscl    = tridentfb_ddc_setscl;
                par->ddc_algo.getsda    = tridentfb_ddc_getsda;
                par->ddc_algo.getscl    = tridentfb_ddc_getscl;
        }
        par->ddc_algo.udelay            = 10;
        par->ddc_algo.timeout           = 20;
        par->ddc_algo.data              = par;

        i2c_set_adapdata(&par->ddc_adapter, par);

        return i2c_bit_add_bus(&par->ddc_adapter);
}

/*
 * Blade specific acceleration.
 */

#define point(x, y) ((y) << 16 | (x))

static void blade_init_accel(struct tridentfb_par *par, int pitch, int bpp)
{
        int v1 = (pitch >> 3) << 20;
        int tmp = bpp == 24 ? 2 : (bpp >> 4);
        int v2 = v1 | (tmp << 29);

        writemmr(par, 0x21C0, v2);
        writemmr(par, 0x21C4, v2);
        writemmr(par, 0x21B8, v2);
        writemmr(par, 0x21BC, v2);
        writemmr(par, 0x21D0, v1);
        writemmr(par, 0x21D4, v1);
        writemmr(par, 0x21C8, v1);
        writemmr(par, 0x21CC, v1);
        writemmr(par, 0x216C, 0);
}

static void blade_wait_engine(struct tridentfb_par *par)
{
        while (readmmr(par, STATUS) & 0xFA800000)
                cpu_relax();
}

static void blade_fill_rect(struct tridentfb_par *par,
                            u32 x, u32 y, u32 w, u32 h, u32 c, u32 rop)
{
        writemmr(par, COLOR, c);
        writemmr(par, ROP, rop ? ROP_X : ROP_S);
        writemmr(par, CMD, 0x20000000 | 1 << 19 | 1 << 4 | 2 << 2);

        writemmr(par, DST1, point(x, y));
        writemmr(par, DST2, point(x + w - 1, y + h - 1));
}

static void blade_image_blit(struct tridentfb_par *par, const char *data,
                             u32 x, u32 y, u32 w, u32 h, u32 c, u32 b)
{
        unsigned size = ((w + 31) >> 5) * h;

        writemmr(par, COLOR, c);
        writemmr(par, BGCOLOR, b);
        writemmr(par, CMD, 0xa0000000 | 3 << 19);

        writemmr(par, DST1, point(x, y));
        writemmr(par, DST2, point(x + w - 1, y + h - 1));

        iowrite32_rep(par->io_virt + 0x10000, data, size);
}

static void blade_copy_rect(struct tridentfb_par *par,
                            u32 x1, u32 y1, u32 x2, u32 y2, u32 w, u32 h)
{
        int direction = 2;
        u32 s1 = point(x1, y1);
        u32 s2 = point(x1 + w - 1, y1 + h - 1);
        u32 d1 = point(x2, y2);
        u32 d2 = point(x2 + w - 1, y2 + h - 1);

        if ((y1 > y2) || ((y1 == y2) && (x1 > x2)))
                direction = 0;

        writemmr(par, ROP, ROP_S);
        writemmr(par, CMD, 0xE0000000 | 1 << 19 | 1 << 4 | 1 << 2 | direction);

        writemmr(par, SRC1, direction ? s2 : s1);
        writemmr(par, SRC2, direction ? s1 : s2);
        writemmr(par, DST1, direction ? d2 : d1);
        writemmr(par, DST2, direction ? d1 : d2);
}

/*
 * BladeXP specific acceleration functions
 */

static void xp_init_accel(struct tridentfb_par *par, int pitch, int bpp)
{
        unsigned char x = bpp == 24 ? 3 : (bpp >> 4);
        int v1 = pitch << (bpp == 24 ? 20 : (18 + x));

        switch (pitch << (bpp >> 3)) {
        case 8192:
        case 512:
                x |= 0x00;
                break;
        case 1024:
                x |= 0x04;
                break;
        case 2048:
                x |= 0x08;
                break;
        case 4096:
                x |= 0x0C;
                break;
        }

        t_outb(par, x, 0x2125);

        par->eng_oper = x | 0x40;

        writemmr(par, 0x2154, v1);
        writemmr(par, 0x2150, v1);
        t_outb(par, 3, 0x2126);
}

static void xp_wait_engine(struct tridentfb_par *par)
{
        int count = 0;
        int timeout = 0;

        while (t_inb(par, STATUS) & 0x80) {
                count++;
                if (count == 10000000) {
                        /* Timeout */
                        count = 9990000;
                        timeout++;
                        if (timeout == 8) {
                                /* Reset engine */
                                t_outb(par, 0x00, STATUS);
                                return;
                        }
                }
                cpu_relax();
        }
}

static void xp_fill_rect(struct tridentfb_par *par,
                         u32 x, u32 y, u32 w, u32 h, u32 c, u32 rop)
{
        writemmr(par, 0x2127, ROP_P);
        writemmr(par, 0x2158, c);
        writemmr(par, DRAWFL, 0x4000);
        writemmr(par, OLDDIM, point(h, w));
        writemmr(par, OLDDST, point(y, x));
        t_outb(par, 0x01, OLDCMD);
        t_outb(par, par->eng_oper, 0x2125);
}

static void xp_copy_rect(struct tridentfb_par *par,
                         u32 x1, u32 y1, u32 x2, u32 y2, u32 w, u32 h)
{
        u32 x1_tmp, x2_tmp, y1_tmp, y2_tmp;
        int direction = 0x0004;

        if ((x1 < x2) && (y1 == y2)) {
                direction |= 0x0200;
                x1_tmp = x1 + w - 1;
                x2_tmp = x2 + w - 1;
        } else {
                x1_tmp = x1;
                x2_tmp = x2;
        }

        if (y1 < y2) {
                direction |= 0x0100;
                y1_tmp = y1 + h - 1;
                y2_tmp = y2 + h - 1;
        } else {
                y1_tmp = y1;
                y2_tmp = y2;
        }

        writemmr(par, DRAWFL, direction);
        t_outb(par, ROP_S, 0x2127);
        writemmr(par, OLDSRC, point(y1_tmp, x1_tmp));
        writemmr(par, OLDDST, point(y2_tmp, x2_tmp));
        writemmr(par, OLDDIM, point(h, w));
        t_outb(par, 0x01, OLDCMD);
}

/*
 * Image specific acceleration functions
 */
static void image_init_accel(struct tridentfb_par *par, int pitch, int bpp)
{
        int tmp = bpp == 24 ? 2: (bpp >> 4);

        writemmr(par, 0x2120, 0xF0000000);
        writemmr(par, 0x2120, 0x40000000 | tmp);
        writemmr(par, 0x2120, 0x80000000);
        writemmr(par, 0x2144, 0x00000000);
        writemmr(par, 0x2148, 0x00000000);
        writemmr(par, 0x2150, 0x00000000);
        writemmr(par, 0x2154, 0x00000000);
        writemmr(par, 0x2120, 0x60000000 | (pitch << 16) | pitch);
        writemmr(par, 0x216C, 0x00000000);
        writemmr(par, 0x2170, 0x00000000);
        writemmr(par, 0x217C, 0x00000000);
        writemmr(par, 0x2120, 0x10000000);
        writemmr(par, 0x2130, (2047 << 16) | 2047);
}

static void image_wait_engine(struct tridentfb_par *par)
{
        while (readmmr(par, 0x2164) & 0xF0000000)
                cpu_relax();
}

static void image_fill_rect(struct tridentfb_par *par,
                            u32 x, u32 y, u32 w, u32 h, u32 c, u32 rop)
{
        writemmr(par, 0x2120, 0x80000000);
        writemmr(par, 0x2120, 0x90000000 | ROP_S);

        writemmr(par, 0x2144, c);

        writemmr(par, DST1, point(x, y));
        writemmr(par, DST2, point(x + w - 1, y + h - 1));

        writemmr(par, 0x2124, 0x80000000 | 3 << 22 | 1 << 10 | 1 << 9);
}

static void image_copy_rect(struct tridentfb_par *par,
                            u32 x1, u32 y1, u32 x2, u32 y2, u32 w, u32 h)
{
        int direction = 0x4;
        u32 s1 = point(x1, y1);
        u32 s2 = point(x1 + w - 1, y1 + h - 1);
        u32 d1 = point(x2, y2);
        u32 d2 = point(x2 + w - 1, y2 + h - 1);

        if ((y1 > y2) || ((y1 == y2) && (x1 > x2)))
                direction = 0;

        writemmr(par, 0x2120, 0x80000000);
        writemmr(par, 0x2120, 0x90000000 | ROP_S);

        writemmr(par, SRC1, direction ? s2 : s1);
        writemmr(par, SRC2, direction ? s1 : s2);
        writemmr(par, DST1, direction ? d2 : d1);
        writemmr(par, DST2, direction ? d1 : d2);
        writemmr(par, 0x2124,
                 0x80000000 | 1 << 22 | 1 << 10 | 1 << 7 | direction);
}

/*
 * TGUI 9440/96XX acceleration
 */

static void tgui_init_accel(struct tridentfb_par *par, int pitch, int bpp)
{
        unsigned char x = bpp == 24 ? 3 : (bpp >> 4);

        /* disable clipping */
        writemmr(par, 0x2148, 0);
        writemmr(par, 0x214C, point(4095, 2047));

        switch ((pitch * bpp) / 8) {
        case 8192:
        case 512:
                x |= 0x00;
                break;
        case 1024:
                x |= 0x04;
                break;
        case 2048:
                x |= 0x08;
                break;
        case 4096:
                x |= 0x0C;
                break;
        }

        fb_writew(x, par->io_virt + 0x2122);
}

static void tgui_fill_rect(struct tridentfb_par *par,
                           u32 x, u32 y, u32 w, u32 h, u32 c, u32 rop)
{
        t_outb(par, ROP_P, 0x2127);
        writemmr(par, OLDCLR, c);
        writemmr(par, DRAWFL, 0x4020);
        writemmr(par, OLDDIM, point(w - 1, h - 1));
        writemmr(par, OLDDST, point(x, y));
        t_outb(par, 1, OLDCMD);
}

static void tgui_copy_rect(struct tridentfb_par *par,
                           u32 x1, u32 y1, u32 x2, u32 y2, u32 w, u32 h)
{
        int flags = 0;
        u16 x1_tmp, x2_tmp, y1_tmp, y2_tmp;

        if ((x1 < x2) && (y1 == y2)) {
                flags |= 0x0200;
                x1_tmp = x1 + w - 1;
                x2_tmp = x2 + w - 1;
        } else {
                x1_tmp = x1;
                x2_tmp = x2;
        }

        if (y1 < y2) {
                flags |= 0x0100;
                y1_tmp = y1 + h - 1;
                y2_tmp = y2 + h - 1;
        } else {
                y1_tmp = y1;
                y2_tmp = y2;
        }

        writemmr(par, DRAWFL, 0x4 | flags);
        t_outb(par, ROP_S, 0x2127);
        writemmr(par, OLDSRC, point(x1_tmp, y1_tmp));
        writemmr(par, OLDDST, point(x2_tmp, y2_tmp));
        writemmr(par, OLDDIM, point(w - 1, h - 1));
        t_outb(par, 1, OLDCMD);
}

/*
 * Accel functions called by the upper layers
 */
static void tridentfb_fillrect(struct fb_info *info,
                               const struct fb_fillrect *fr)
{
        struct tridentfb_par *par = info->par;
        int col;

        if (info->flags & FBINFO_HWACCEL_DISABLED) {
                cfb_fillrect(info, fr);
                return;
        }
        if (info->var.bits_per_pixel == 8) {
                col = fr->color;
                col |= col << 8;
                col |= col << 16;
        } else
                col = ((u32 *)(info->pseudo_palette))[fr->color];

        par->wait_engine(par);
        par->fill_rect(par, fr->dx, fr->dy, fr->width,
                       fr->height, col, fr->rop);
}

static void tridentfb_imageblit(struct fb_info *info,
                                const struct fb_image *img)
{
        struct tridentfb_par *par = info->par;
        int col, bgcol;

        if ((info->flags & FBINFO_HWACCEL_DISABLED) || img->depth != 1) {
                cfb_imageblit(info, img);
                return;
        }
        if (info->var.bits_per_pixel == 8) {
                col = img->fg_color;
                col |= col << 8;
                col |= col << 16;
                bgcol = img->bg_color;
                bgcol |= bgcol << 8;
                bgcol |= bgcol << 16;
        } else {
                col = ((u32 *)(info->pseudo_palette))[img->fg_color];
                bgcol = ((u32 *)(info->pseudo_palette))[img->bg_color];
        }

        par->wait_engine(par);
        if (par->image_blit)
                par->image_blit(par, img->data, img->dx, img->dy,
                                img->width, img->height, col, bgcol);
        else
                cfb_imageblit(info, img);
}

static void tridentfb_copyarea(struct fb_info *info,
                               const struct fb_copyarea *ca)
{
        struct tridentfb_par *par = info->par;

        if (info->flags & FBINFO_HWACCEL_DISABLED) {
                cfb_copyarea(info, ca);
                return;
        }
        par->wait_engine(par);
        par->copy_rect(par, ca->sx, ca->sy, ca->dx, ca->dy,
                       ca->width, ca->height);
}

static int tridentfb_sync(struct fb_info *info)
{
        struct tridentfb_par *par = info->par;

        if (!(info->flags & FBINFO_HWACCEL_DISABLED))
                par->wait_engine(par);
        return 0;
}

/*
 * Hardware access functions
 */

static inline unsigned char read3X4(struct tridentfb_par *par, int reg)
{
        return vga_mm_rcrt(par->io_virt, reg);
}

static inline void write3X4(struct tridentfb_par *par, int reg,
                            unsigned char val)
{
        vga_mm_wcrt(par->io_virt, reg, val);
}

static inline unsigned char read3CE(struct tridentfb_par *par,
                                    unsigned char reg)
{
        return vga_mm_rgfx(par->io_virt, reg);
}

static inline void writeAttr(struct tridentfb_par *par, int reg,
                             unsigned char val)
{
        fb_readb(par->io_virt + VGA_IS1_RC);    /* flip-flop to index */
        vga_mm_wattr(par->io_virt, reg, val);
}

static inline void write3CE(struct tridentfb_par *par, int reg,
                            unsigned char val)
{
        vga_mm_wgfx(par->io_virt, reg, val);
}

static void enable_mmio(struct tridentfb_par *par)
{
        /* Goto New Mode */
        vga_io_rseq(0x0B);

        /* Unprotect registers */
        vga_io_wseq(NewMode1, 0x80);
        if (!is_oldprotect(par->chip_id))
                vga_io_wseq(Protection, 0x92);

        /* Enable MMIO */
        outb(PCIReg, 0x3D4);
        outb(inb(0x3D5) | 0x01, 0x3D5);
}

static void disable_mmio(struct tridentfb_par *par)
{
        /* Goto New Mode */
        vga_mm_rseq(par->io_virt, 0x0B);

        /* Unprotect registers */
        vga_mm_wseq(par->io_virt, NewMode1, 0x80);
        if (!is_oldprotect(par->chip_id))
                vga_mm_wseq(par->io_virt, Protection, 0x92);

        /* Disable MMIO */
        t_outb(par, PCIReg, 0x3D4);
        t_outb(par, t_inb(par, 0x3D5) & ~0x01, 0x3D5);
}

static inline void crtc_unlock(struct tridentfb_par *par)
{
        write3X4(par, VGA_CRTC_V_SYNC_END,
                 read3X4(par, VGA_CRTC_V_SYNC_END) & 0x7F);
}

/*  Return flat panel's maximum x resolution */
static int get_nativex(struct tridentfb_par *par)
{
        int x, y, tmp;

        if (nativex)
                return nativex;

        tmp = (read3CE(par, VertStretch) >> 4) & 3;

        switch (tmp) {
        case 0:
                x = 1280; y = 1024;
                break;
        case 2:
                x = 1024; y = 768;
                break;
        case 3:
                x = 800; y = 600;
                break;
        case 1:
        default:
                x = 640;  y = 480;
                break;
        }

        output("%dx%d flat panel found\n", x, y);
        return x;
}

/* Set pitch */
static inline void set_lwidth(struct tridentfb_par *par, int width)
{
        write3X4(par, VGA_CRTC_OFFSET, width & 0xFF);
        /* chips older than TGUI9660 have only 1 width bit in AddColReg */
        /* touching the other one breaks I2C/DDC */
        if (par->chip_id == TGUI9440 || par->chip_id == CYBER9320)
                write3X4(par, AddColReg,
                     (read3X4(par, AddColReg) & 0xEF) | ((width & 0x100) >> 4));
        else
                write3X4(par, AddColReg,
                     (read3X4(par, AddColReg) & 0xCF) | ((width & 0x300) >> 4));
}

/* For resolutions smaller than FP resolution stretch */
static void screen_stretch(struct tridentfb_par *par)
{
        if (par->chip_id != CYBERBLADEXPAi1)
                write3CE(par, BiosReg, 0);
        else
                write3CE(par, BiosReg, 8);
        write3CE(par, VertStretch, (read3CE(par, VertStretch) & 0x7C) | 1);
        write3CE(par, HorStretch, (read3CE(par, HorStretch) & 0x7C) | 1);
}

/* For resolutions smaller than FP resolution center */
static inline void screen_center(struct tridentfb_par *par)
{
        write3CE(par, VertStretch, (read3CE(par, VertStretch) & 0x7C) | 0x80);
        write3CE(par, HorStretch, (read3CE(par, HorStretch) & 0x7C) | 0x80);
}

/* Address of first shown pixel in display memory */
static void set_screen_start(struct tridentfb_par *par, int base)
{
        u8 tmp;
        write3X4(par, VGA_CRTC_START_LO, base & 0xFF);
        write3X4(par, VGA_CRTC_START_HI, (base & 0xFF00) >> 8);
        tmp = read3X4(par, CRTCModuleTest) & 0xDF;
        write3X4(par, CRTCModuleTest, tmp | ((base & 0x10000) >> 11));
        tmp = read3X4(par, CRTHiOrd) & 0xF8;
        write3X4(par, CRTHiOrd, tmp | ((base & 0xE0000) >> 17));
}

/* Set dotclock frequency */
static void set_vclk(struct tridentfb_par *par, unsigned long freq)
{
        int m, n, k;
        unsigned long fi, d, di;
        unsigned char best_m = 0, best_n = 0, best_k = 0;
        unsigned char hi, lo;
        unsigned char shift = !is_oldclock(par->chip_id) ? 2 : 1;

        d = 20000;
        for (k = shift; k >= 0; k--)
                for (m = 1; m < 32; m++) {
                        n = ((m + 2) << shift) - 8;
                        for (n = (n < 0 ? 0 : n); n < 122; n++) {
                                fi = ((14318l * (n + 8)) / (m + 2)) >> k;
                                di = abs(fi - freq);
                                if (di < d || (di == d && k == best_k)) {
                                        d = di;
                                        best_n = n;
                                        best_m = m;
                                        best_k = k;
                                }
                                if (fi > freq)
                                        break;
                        }
                }

        if (is_oldclock(par->chip_id)) {
                lo = best_n | (best_m << 7);
                hi = (best_m >> 1) | (best_k << 4);
        } else {
                lo = best_n;
                hi = best_m | (best_k << 6);
        }

        if (is3Dchip(par->chip_id)) {
                vga_mm_wseq(par->io_virt, ClockHigh, hi);
                vga_mm_wseq(par->io_virt, ClockLow, lo);
        } else {
                t_outb(par, lo, 0x43C8);
                t_outb(par, hi, 0x43C9);
        }
        debug("VCLK = %X %X\n", hi, lo);
}

/* Set number of lines for flat panels*/
static void set_number_of_lines(struct tridentfb_par *par, int lines)
{
        int tmp = read3CE(par, CyberEnhance) & 0x8F;
        if (lines > 1024)
                tmp |= 0x50;
        else if (lines > 768)
                tmp |= 0x30;
        else if (lines > 600)
                tmp |= 0x20;
        else if (lines > 480)
                tmp |= 0x10;
        write3CE(par, CyberEnhance, tmp);
}

/*
 * If we see that FP is active we assume we have one.
 * Otherwise we have a CRT display. User can override.
 */
static int is_flatpanel(struct tridentfb_par *par)
{
        if (fp)
                return 1;
        if (crt || !iscyber(par->chip_id))
                return 0;
        return (read3CE(par, FPConfig) & 0x10) ? 1 : 0;
}

/* Try detecting the video memory size */
static unsigned int get_memsize(struct tridentfb_par *par)
{
        unsigned char tmp, tmp2;
        unsigned int k;

        /* If memory size provided by user */
        if (memsize)
                k = memsize * Kb;
        else
                switch (par->chip_id) {
                case CYBER9525DVD:
                        k = 2560 * Kb;
                        break;
                default:
                        tmp = read3X4(par, SPR) & 0x0F;
                        switch (tmp) {

                        case 0x01:
                                k = 512 * Kb;
                                break;
                        case 0x02:
                                k = 6 * Mb;     /* XP */
                                break;
                        case 0x03:
                                k = 1 * Mb;
                                break;
                        case 0x04:
                                k = 8 * Mb;
                                break;
                        case 0x06:
                                k = 10 * Mb;    /* XP */
                                break;
                        case 0x07:
                                k = 2 * Mb;
                                break;
                        case 0x08:
                                k = 12 * Mb;    /* XP */
                                break;
                        case 0x0A:
                                k = 14 * Mb;    /* XP */
                                break;
                        case 0x0C:
                                k = 16 * Mb;    /* XP */
                                break;
                        case 0x0E:              /* XP */

                                tmp2 = vga_mm_rseq(par->io_virt, 0xC1);
                                switch (tmp2) {
                                case 0x00:
                                        k = 20 * Mb;
                                        break;
                                case 0x01:
                                        k = 24 * Mb;
                                        break;
                                case 0x10:
                                        k = 28 * Mb;
                                        break;
                                case 0x11:
                                        k = 32 * Mb;
                                        break;
                                default:
                                        k = 1 * Mb;
                                        break;
                                }
                                break;

                        case 0x0F:
                                k = 4 * Mb;
                                break;
                        default:
                                k = 1 * Mb;
                                break;
                        }
                }

        k -= memdiff * Kb;
        output("framebuffer size = %d Kb\n", k / Kb);
        return k;
}

/* See if we can handle the video mode described in var */
static int tridentfb_check_var(struct fb_var_screeninfo *var,
                               struct fb_info *info)
{
        struct tridentfb_par *par = info->par;
        int bpp = var->bits_per_pixel;
        int line_length;
        int ramdac = 230000; /* 230MHz for most 3D chips */
        debug("enter\n");

        /* check color depth */
        if (bpp == 24)

                bpp = var->bits_per_pixel = 32;
        if (bpp != 8 && bpp != 16 && bpp != 32)
                return -EINVAL;
        if (par->chip_id == TGUI9440 && bpp == 32)
                return -EINVAL;
        /* check whether resolution fits on panel and in memory */
        if (par->flatpanel && nativex && var->xres > nativex)
                return -EINVAL;
        /* various resolution checks */
        var->xres = (var->xres + 7) & ~0x7;
        if (var->xres > var->xres_virtual)
                var->xres_virtual = var->xres;
        if (var->yres > var->yres_virtual)
                var->yres_virtual = var->yres;
        if (var->xres_virtual > 4095 || var->yres > 2048)
                return -EINVAL;
        /* prevent from position overflow for acceleration */
        if (var->yres_virtual > 0xffff)
                return -EINVAL;
        line_length = var->xres_virtual * bpp / 8;

        if (!is3Dchip(par->chip_id) &&
            !(info->flags & FBINFO_HWACCEL_DISABLED)) {
                /* acceleration requires line length to be power of 2 */
                if (line_length <= 512)
                        var->xres_virtual = 512 * 8 / bpp;
                else if (line_length <= 1024)
                        var->xres_virtual = 1024 * 8 / bpp;
                else if (line_length <= 2048)
                        var->xres_virtual = 2048 * 8 / bpp;
                else if (line_length <= 4096)
                        var->xres_virtual = 4096 * 8 / bpp;
                else if (line_length <= 8192)
                        var->xres_virtual = 8192 * 8 / bpp;
                else
                        return -EINVAL;

                line_length = var->xres_virtual * bpp / 8;
        }

        /* datasheet specifies how to set panning only up to 4 MB */
        if (line_length * (var->yres_virtual - var->yres) > (4 << 20))
                var->yres_virtual = ((4 << 20) / line_length) + var->yres;

        if (line_length * var->yres_virtual > info->fix.smem_len)
                return -EINVAL;

        switch (bpp) {
        case 8:
                var->red.offset = 0;
                var->red.length = 8;
                var->green = var->red;
                var->blue = var->red;
                break;
        case 16:
                var->red.offset = 11;
                var->green.offset = 5;
                var->blue.offset = 0;
                var->red.length = 5;
                var->green.length = 6;
                var->blue.length = 5;
                break;
        case 32:
                var->red.offset = 16;
                var->green.offset = 8;
                var->blue.offset = 0;
                var->red.length = 8;
                var->green.length = 8;
                var->blue.length = 8;
                break;
        default:
                return -EINVAL;
        }

        if (is_xp(par->chip_id))
                ramdac = 350000;

        switch (par->chip_id) {
        case TGUI9440:
                ramdac = (bpp >= 16) ? 45000 : 90000;
                break;
        case CYBER9320:
        case TGUI9660:
                ramdac = 135000;
                break;
        case PROVIDIA9685:
        case CYBER9388:
        case CYBER9382:
        case CYBER9385:
                ramdac = 170000;
                break;
        }

        /* The clock is doubled for 32 bpp */
        if (bpp == 32)
                ramdac /= 2;

        if (PICOS2KHZ(var->pixclock) > ramdac)
                return -EINVAL;

        debug("exit\n");

        return 0;

}

/* Pan the display */
static int tridentfb_pan_display(struct fb_var_screeninfo *var,
                                 struct fb_info *info)
{
        struct tridentfb_par *par = info->par;
        unsigned int offset;

        debug("enter\n");
        offset = (var->xoffset + (var->yoffset * info->var.xres_virtual))
                * info->var.bits_per_pixel / 32;
        set_screen_start(par, offset);
        debug("exit\n");
        return 0;
}

static inline void shadowmode_on(struct tridentfb_par *par)
{
        write3CE(par, CyberControl, read3CE(par, CyberControl) | 0x81);
}

static inline void shadowmode_off(struct tridentfb_par *par)
{
        write3CE(par, CyberControl, read3CE(par, CyberControl) & 0x7E);
}

/* Set the hardware to the requested video mode */
static int tridentfb_set_par(struct fb_info *info)
{
        struct tridentfb_par *par = info->par;
        u32 htotal, hdispend, hsyncstart, hsyncend, hblankstart, hblankend;
        u32 vtotal, vdispend, vsyncstart, vsyncend, vblankstart, vblankend;
        struct fb_var_screeninfo *var = &info->var;
        int bpp = var->bits_per_pixel;
        unsigned char tmp;
        unsigned long vclk;

        debug("enter\n");
        hdispend = var->xres / 8 - 1;
        hsyncstart = (var->xres + var->right_margin) / 8;
        hsyncend = (var->xres + var->right_margin + var->hsync_len) / 8;
        htotal = (var->xres + var->left_margin + var->right_margin +
                  var->hsync_len) / 8 - 5;
        hblankstart = hdispend + 1;
        hblankend = htotal + 3;

        vdispend = var->yres - 1;
        vsyncstart = var->yres + var->lower_margin;
        vsyncend = vsyncstart + var->vsync_len;
        vtotal = var->upper_margin + vsyncend - 2;
        vblankstart = vdispend + 1;
        vblankend = vtotal;

        if (info->var.vmode & FB_VMODE_INTERLACED) {
                vtotal /= 2;
                vdispend /= 2;
                vsyncstart /= 2;
                vsyncend /= 2;
                vblankstart /= 2;
                vblankend /= 2;
        }

        enable_mmio(par);
        crtc_unlock(par);
        write3CE(par, CyberControl, 8);
        tmp = 0xEB;
        if (var->sync & FB_SYNC_HOR_HIGH_ACT)
                tmp &= ~0x40;
        if (var->sync & FB_SYNC_VERT_HIGH_ACT)
                tmp &= ~0x80;

        if (par->flatpanel && var->xres < nativex) {
                /*
                 * on flat panels with native size larger
                 * than requested resolution decide whether
                 * we stretch or center
                 */
                t_outb(par, tmp | 0xC0, VGA_MIS_W);

                shadowmode_on(par);

                if (center)
                        screen_center(par);
                else if (stretch)
                        screen_stretch(par);

        } else {
                t_outb(par, tmp, VGA_MIS_W);
                write3CE(par, CyberControl, 8);
        }

        /* vertical timing values */
        write3X4(par, VGA_CRTC_V_TOTAL, vtotal & 0xFF);
        write3X4(par, VGA_CRTC_V_DISP_END, vdispend & 0xFF);
        write3X4(par, VGA_CRTC_V_SYNC_START, vsyncstart & 0xFF);
        write3X4(par, VGA_CRTC_V_SYNC_END, (vsyncend & 0x0F));
        write3X4(par, VGA_CRTC_V_BLANK_START, vblankstart & 0xFF);
        write3X4(par, VGA_CRTC_V_BLANK_END, vblankend & 0xFF);

        /* horizontal timing values */
        write3X4(par, VGA_CRTC_H_TOTAL, htotal & 0xFF);
        write3X4(par, VGA_CRTC_H_DISP, hdispend & 0xFF);
        write3X4(par, VGA_CRTC_H_SYNC_START, hsyncstart & 0xFF);
        write3X4(par, VGA_CRTC_H_SYNC_END,
                 (hsyncend & 0x1F) | ((hblankend & 0x20) << 2));
        write3X4(par, VGA_CRTC_H_BLANK_START, hblankstart & 0xFF);
        write3X4(par, VGA_CRTC_H_BLANK_END, hblankend & 0x1F);

        /* higher bits of vertical timing values */
        tmp = 0x10;
        if (vtotal & 0x100) tmp |= 0x01;
        if (vdispend & 0x100) tmp |= 0x02;
        if (vsyncstart & 0x100) tmp |= 0x04;
        if (vblankstart & 0x100) tmp |= 0x08;

        if (vtotal & 0x200) tmp |= 0x20;
        if (vdispend & 0x200) tmp |= 0x40;
        if (vsyncstart & 0x200) tmp |= 0x80;
        write3X4(par, VGA_CRTC_OVERFLOW, tmp);

        tmp = read3X4(par, CRTHiOrd) & 0x07;
        tmp |= 0x08;    /* line compare bit 10 */
        if (vtotal & 0x400) tmp |= 0x80;
        if (vblankstart & 0x400) tmp |= 0x40;
        if (vsyncstart & 0x400) tmp |= 0x20;
        if (vdispend & 0x400) tmp |= 0x10;
        write3X4(par, CRTHiOrd, tmp);

        tmp = (htotal >> 8) & 0x01;
        tmp |= (hdispend >> 7) & 0x02;
        tmp |= (hsyncstart >> 5) & 0x08;
        tmp |= (hblankstart >> 4) & 0x10;
        write3X4(par, HorizOverflow, tmp);

        tmp = 0x40;
        if (vblankstart & 0x200) tmp |= 0x20;
//FIXME if (info->var.vmode & FB_VMODE_DOUBLE) tmp |= 0x80;  /* double scan for 200 line modes */
        write3X4(par, VGA_CRTC_MAX_SCAN, tmp);

        write3X4(par, VGA_CRTC_LINE_COMPARE, 0xFF);
        write3X4(par, VGA_CRTC_PRESET_ROW, 0);
        write3X4(par, VGA_CRTC_MODE, 0xC3);

        write3X4(par, LinearAddReg, 0x20);      /* enable linear addressing */

        tmp = (info->var.vmode & FB_VMODE_INTERLACED) ? 0x84 : 0x80;
        /* enable access extended memory */
        write3X4(par, CRTCModuleTest, tmp);
        tmp = read3CE(par, MiscIntContReg) & ~0x4;
        if (info->var.vmode & FB_VMODE_INTERLACED)
                tmp |= 0x4;
        write3CE(par, MiscIntContReg, tmp);

        /* enable GE for text acceleration */
        write3X4(par, GraphEngReg, 0x80);

        switch (bpp) {
        case 8:
                tmp = 0x00;
                break;
        case 16:
                tmp = 0x05;
                break;
        case 24:
                tmp = 0x29;
                break;
        case 32:
                tmp = 0x09;
                break;
        }

        write3X4(par, PixelBusReg, tmp);

        tmp = read3X4(par, DRAMControl);
        if (!is_oldprotect(par->chip_id))
                tmp |= 0x10;
        if (iscyber(par->chip_id))
                tmp |= 0x20;
        write3X4(par, DRAMControl, tmp);        /* both IO, linear enable */

        write3X4(par, InterfaceSel, read3X4(par, InterfaceSel) | 0x40);
        if (!is_xp(par->chip_id))
                write3X4(par, Performance, read3X4(par, Performance) | 0x10);
        /* MMIO & PCI read and write burst enable */
        if (par->chip_id != TGUI9440 && par->chip_id != IMAGE975)
                write3X4(par, PCIReg, read3X4(par, PCIReg) | 0x06);

        vga_mm_wseq(par->io_virt, 0, 3);
        vga_mm_wseq(par->io_virt, 1, 1); /* set char clock 8 dots wide */
        /* enable 4 maps because needed in chain4 mode */
        vga_mm_wseq(par->io_virt, 2, 0x0F);
        vga_mm_wseq(par->io_virt, 3, 0);
        vga_mm_wseq(par->io_virt, 4, 0x0E); /* memory mode enable bitmaps ?? */

        /* convert from picoseconds to kHz */
        vclk = PICOS2KHZ(info->var.pixclock);

        /* divide clock by 2 if 32bpp chain4 mode display and CPU path */
        tmp = read3CE(par, MiscExtFunc) & 0xF0;
        if (bpp == 32 || (par->chip_id == TGUI9440 && bpp == 16)) {
                tmp |= 8;
                vclk *= 2;
        }
        set_vclk(par, vclk);
        write3CE(par, MiscExtFunc, tmp | 0x12);
        write3CE(par, 0x5, 0x40);       /* no CGA compat, allow 256 col */
        write3CE(par, 0x6, 0x05);       /* graphics mode */
        write3CE(par, 0x7, 0x0F);       /* planes? */

        /* graphics mode and support 256 color modes */
        writeAttr(par, 0x10, 0x41);
        writeAttr(par, 0x12, 0x0F);     /* planes */
        writeAttr(par, 0x13, 0);        /* horizontal pel panning */

        /* colors */
        for (tmp = 0; tmp < 0x10; tmp++)
                writeAttr(par, tmp, tmp);
        fb_readb(par->io_virt + VGA_IS1_RC);    /* flip-flop to index */
        t_outb(par, 0x20, VGA_ATT_W);           /* enable attr */

        switch (bpp) {
        case 8:
                tmp = 0;
                break;
        case 16:
                tmp = 0x30;
                break;
        case 24:
        case 32:
                tmp = 0xD0;
                break;
        }

        t_inb(par, VGA_PEL_IW);
        t_inb(par, VGA_PEL_MSK);
        t_inb(par, VGA_PEL_MSK);
        t_inb(par, VGA_PEL_MSK);
        t_inb(par, VGA_PEL_MSK);
        t_outb(par, tmp, VGA_PEL_MSK);
        t_inb(par, VGA_PEL_IW);

        if (par->flatpanel)
                set_number_of_lines(par, info->var.yres);
        info->fix.line_length = info->var.xres_virtual * bpp / 8;
        set_lwidth(par, info->fix.line_length / 8);

        if (!(info->flags & FBINFO_HWACCEL_DISABLED))
                par->init_accel(par, info->var.xres_virtual, bpp);

        info->fix.visual = (bpp == 8) ? FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
        info->cmap.len = (bpp == 8) ? 256 : 16;
        debug("exit\n");
        return 0;
}

/* Set one color register */
static int tridentfb_setcolreg(unsigned regno, unsigned red, unsigned green,
                               unsigned blue, unsigned transp,
                               struct fb_info *info)
{
        int bpp = info->var.bits_per_pixel;
        struct tridentfb_par *par = info->par;

        if (regno >= info->cmap.len)
                return 1;

        if (bpp == 8) {
                t_outb(par, 0xFF, VGA_PEL_MSK);
                t_outb(par, regno, VGA_PEL_IW);

                t_outb(par, red >> 10, VGA_PEL_D);
                t_outb(par, green >> 10, VGA_PEL_D);
                t_outb(par, blue >> 10, VGA_PEL_D);

        } else if (regno < 16) {
                if (bpp == 16) {        /* RGB 565 */
                        u32 col;

                        col = (red & 0xF800) | ((green & 0xFC00) >> 5) |
                                ((blue & 0xF800) >> 11);
                        col |= col << 16;
                        ((u32 *)(info->pseudo_palette))[regno] = col;
                } else if (bpp == 32)           /* ARGB 8888 */
                        ((u32 *)info->pseudo_palette)[regno] =
                                ((transp & 0xFF00) << 16)       |
                                ((red & 0xFF00) << 8)           |
                                ((green & 0xFF00))              |
                                ((blue & 0xFF00) >> 8);
        }

        return 0;
}

/* Try blanking the screen. For flat panels it does nothing */
static int tridentfb_blank(int blank_mode, struct fb_info *info)
{
        unsigned char PMCont, DPMSCont;
        struct tridentfb_par *par = info->par;

        debug("enter\n");
        if (par->flatpanel)
                return 0;
        t_outb(par, 0x04, 0x83C8); /* Read DPMS Control */
        PMCont = t_inb(par, 0x83C6) & 0xFC;
        DPMSCont = read3CE(par, PowerStatus) & 0xFC;
        switch (blank_mode) {
        case FB_BLANK_UNBLANK:
                /* Screen: On, HSync: On, VSync: On */
        case FB_BLANK_NORMAL:
                /* Screen: Off, HSync: On, VSync: On */
                PMCont |= 0x03;
                DPMSCont |= 0x00;
                break;
        case FB_BLANK_HSYNC_SUSPEND:
                /* Screen: Off, HSync: Off, VSync: On */
                PMCont |= 0x02;
                DPMSCont |= 0x01;
                break;
        case FB_BLANK_VSYNC_SUSPEND:
                /* Screen: Off, HSync: On, VSync: Off */
                PMCont |= 0x02;
                DPMSCont |= 0x02;
                break;
        case FB_BLANK_POWERDOWN:
                /* Screen: Off, HSync: Off, VSync: Off */
                PMCont |= 0x00;
                DPMSCont |= 0x03;
                break;
        }

        write3CE(par, PowerStatus, DPMSCont);
        t_outb(par, 4, 0x83C8);
        t_outb(par, PMCont, 0x83C6);

        debug("exit\n");

        /* let fbcon do a softblank for us */
        return (blank_mode == FB_BLANK_NORMAL) ? 1 : 0;
}

static const struct fb_ops tridentfb_ops = {
        .owner = THIS_MODULE,
        .fb_setcolreg = tridentfb_setcolreg,
        .fb_pan_display = tridentfb_pan_display,
        .fb_blank = tridentfb_blank,
        .fb_check_var = tridentfb_check_var,
        .fb_set_par = tridentfb_set_par,
        .fb_fillrect = tridentfb_fillrect,
        .fb_copyarea = tridentfb_copyarea,
        .fb_imageblit = tridentfb_imageblit,
        .fb_sync = tridentfb_sync,
};

static int trident_pci_probe(struct pci_dev *dev,
                             const struct pci_device_id *id)
{
        int err;
        unsigned char revision;
        struct fb_info *info;
        struct tridentfb_par *default_par;
        int chip3D;
        int chip_id;
        bool found = false;

        err = pci_enable_device(dev);
        if (err)
                return err;

        info = framebuffer_alloc(sizeof(struct tridentfb_par), &dev->dev);
        if (!info)
                return -ENOMEM;
        default_par = info->par;

        chip_id = id->device;

        /* If PCI id is 0x9660 then further detect chip type */

        if (chip_id == TGUI9660) {
                revision = vga_io_rseq(RevisionID);

                switch (revision) {
                case 0x21:
                        chip_id = PROVIDIA9685;
                        break;
                case 0x22:
                case 0x23:
                        chip_id = CYBER9397;
                        break;
                case 0x2A:
                        chip_id = CYBER9397DVD;
                        break;
                case 0x30:
                case 0x33:
                case 0x34:
                case 0x35:
                case 0x38:
                case 0x3A:
                case 0xB3:
                        chip_id = CYBER9385;
                        break;
                case 0x40 ... 0x43:
                        chip_id = CYBER9382;
                        break;
                case 0x4A:
                        chip_id = CYBER9388;
                        break;
                default:
                        break;
                }
        }

        chip3D = is3Dchip(chip_id);

        if (is_xp(chip_id)) {
                default_par->init_accel = xp_init_accel;
                default_par->wait_engine = xp_wait_engine;
                default_par->fill_rect = xp_fill_rect;
                default_par->copy_rect = xp_copy_rect;
                tridentfb_fix.accel = FB_ACCEL_TRIDENT_BLADEXP;
        } else if (is_blade(chip_id)) {
                default_par->init_accel = blade_init_accel;
                default_par->wait_engine = blade_wait_engine;
                default_par->fill_rect = blade_fill_rect;
                default_par->copy_rect = blade_copy_rect;
                default_par->image_blit = blade_image_blit;
                tridentfb_fix.accel = FB_ACCEL_TRIDENT_BLADE3D;
        } else if (chip3D) {                    /* 3DImage family left */
                default_par->init_accel = image_init_accel;
                default_par->wait_engine = image_wait_engine;
                default_par->fill_rect = image_fill_rect;
                default_par->copy_rect = image_copy_rect;
                tridentfb_fix.accel = FB_ACCEL_TRIDENT_3DIMAGE;
        } else {                                /* TGUI 9440/96XX family */
                default_par->init_accel = tgui_init_accel;
                default_par->wait_engine = xp_wait_engine;
                default_par->fill_rect = tgui_fill_rect;
                default_par->copy_rect = tgui_copy_rect;
                tridentfb_fix.accel = FB_ACCEL_TRIDENT_TGUI;
        }

        default_par->chip_id = chip_id;

        /* setup MMIO region */
        tridentfb_fix.mmio_start = pci_resource_start(dev, 1);
        tridentfb_fix.mmio_len = pci_resource_len(dev, 1);

        if (!request_mem_region(tridentfb_fix.mmio_start,
                                tridentfb_fix.mmio_len, "tridentfb")) {
                debug("request_region failed!\n");
                framebuffer_release(info);
                return -1;
        }

        default_par->io_virt = ioremap(tridentfb_fix.mmio_start,
                                               tridentfb_fix.mmio_len);

        if (!default_par->io_virt) {
                debug("ioremap failed\n");
                err = -1;
                goto out_unmap1;
        }

        enable_mmio(default_par);

        /* setup framebuffer memory */
        tridentfb_fix.smem_start = pci_resource_start(dev, 0);
        tridentfb_fix.smem_len = get_memsize(default_par);

        if (!request_mem_region(tridentfb_fix.smem_start,
                                tridentfb_fix.smem_len, "tridentfb")) {
                debug("request_mem_region failed!\n");
                disable_mmio(info->par);
                err = -1;
                goto out_unmap1;
        }

        info->screen_base = ioremap(tridentfb_fix.smem_start,
                                            tridentfb_fix.smem_len);

        if (!info->screen_base) {
                debug("ioremap failed\n");
                err = -1;
                goto out_unmap2;
        }

        default_par->flatpanel = is_flatpanel(default_par);

        if (default_par->flatpanel)
                nativex = get_nativex(default_par);

        info->fix = tridentfb_fix;
        info->fbops = &tridentfb_ops;
        info->pseudo_palette = default_par->pseudo_pal;

        info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
        if (!noaccel && default_par->init_accel) {
                info->flags &= ~FBINFO_HWACCEL_DISABLED;
                info->flags |= FBINFO_HWACCEL_COPYAREA;
                info->flags |= FBINFO_HWACCEL_FILLRECT;
        } else
                info->flags |= FBINFO_HWACCEL_DISABLED;

        if (is_blade(chip_id) && chip_id != BLADE3D)
                info->flags |= FBINFO_READS_FAST;

        info->pixmap.addr = kmalloc(4096, GFP_KERNEL);
        if (!info->pixmap.addr) {
                err = -ENOMEM;
                goto out_unmap2;
        }

        info->pixmap.size = 4096;
        info->pixmap.buf_align = 4;
        info->pixmap.scan_align = 1;
        info->pixmap.access_align = 32;
        info->pixmap.flags = FB_PIXMAP_SYSTEM;
        info->var.bits_per_pixel = 8;

        if (default_par->image_blit) {
                info->flags |= FBINFO_HWACCEL_IMAGEBLIT;
                info->pixmap.scan_align = 4;
        }

        if (noaccel) {
                printk(KERN_DEBUG "disabling acceleration\n");
                info->flags |= FBINFO_HWACCEL_DISABLED;
                info->pixmap.scan_align = 1;
        }

        if (tridentfb_setup_ddc_bus(info) == 0) {
                u8 *edid = fb_ddc_read(&default_par->ddc_adapter);

                default_par->ddc_registered = true;
                if (edid) {
                        fb_edid_to_monspecs(edid, &info->monspecs);
                        kfree(edid);
                        if (!info->monspecs.modedb)
                                dev_err(info->device, "error getting mode database\n");
                        else {
                                const struct fb_videomode *m;

                                fb_videomode_to_modelist(info->monspecs.modedb,
                                                 info->monspecs.modedb_len,
                                                 &info->modelist);
                                m = fb_find_best_display(&info->monspecs,
                                                         &info->modelist);
                                if (m) {
                                        fb_videomode_to_var(&info->var, m);
                                        /* fill all other info->var's fields */
                                        if (tridentfb_check_var(&info->var,
                                                                info) == 0)
                                                found = true;
                                }
                        }
                }
        }

        if (!mode_option && !found)
                mode_option = "640x480-8@60";

        /* Prepare startup mode */
        if (mode_option) {
                err = fb_find_mode(&info->var, info, mode_option,
                                   info->monspecs.modedb,
                                   info->monspecs.modedb_len,
                                   NULL, info->var.bits_per_pixel);
                if (!err || err == 4) {
                        err = -EINVAL;
                        dev_err(info->device, "mode %s not found\n",
                                                                mode_option);
                        fb_destroy_modedb(info->monspecs.modedb);
                        info->monspecs.modedb = NULL;
                        goto out_unmap2;
                }
        }

        fb_destroy_modedb(info->monspecs.modedb);
        info->monspecs.modedb = NULL;

        err = fb_alloc_cmap(&info->cmap, 256, 0);
        if (err < 0)
                goto out_unmap2;

        info->var.activate |= FB_ACTIVATE_NOW;
        info->device = &dev->dev;
        if (register_framebuffer(info) < 0) {
                printk(KERN_ERR "tridentfb: could not register framebuffer\n");
                fb_dealloc_cmap(&info->cmap);
                err = -EINVAL;
                goto out_unmap2;
        }
        output("fb%d: %s frame buffer device %dx%d-%dbpp\n",
           info->node, info->fix.id, info->var.xres,
           info->var.yres, info->var.bits_per_pixel);

        pci_set_drvdata(dev, info);
        return 0;

out_unmap2:
        if (default_par->ddc_registered)
                i2c_del_adapter(&default_par->ddc_adapter);
        kfree(info->pixmap.addr);
        if (info->screen_base)
                iounmap(info->screen_base);
        release_mem_region(tridentfb_fix.smem_start, tridentfb_fix.smem_len);
        disable_mmio(info->par);
out_unmap1:
        if (default_par->io_virt)
                iounmap(default_par->io_virt);
        release_mem_region(tridentfb_fix.mmio_start, tridentfb_fix.mmio_len);
        framebuffer_release(info);
        return err;
}

static void trident_pci_remove(struct pci_dev *dev)
{
        struct fb_info *info = pci_get_drvdata(dev);
        struct tridentfb_par *par = info->par;

        unregister_framebuffer(info);
        if (par->ddc_registered)
                i2c_del_adapter(&par->ddc_adapter);
        iounmap(par->io_virt);
        iounmap(info->screen_base);
        release_mem_region(tridentfb_fix.smem_start, tridentfb_fix.smem_len);
        release_mem_region(tridentfb_fix.mmio_start, tridentfb_fix.mmio_len);
        kfree(info->pixmap.addr);
        fb_dealloc_cmap(&info->cmap);
        framebuffer_release(info);
}

/* List of boards that we are trying to support */
static const struct pci_device_id trident_devices[] = {
        {PCI_VENDOR_ID_TRIDENT, BLADE3D, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, CYBERBLADEi7, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, CYBERBLADEi7D, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, CYBERBLADEi1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, CYBERBLADEi1D, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, CYBERBLADEAi1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, CYBERBLADEAi1D, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, CYBERBLADEE4, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, TGUI9440, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, TGUI9660, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, IMAGE975, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, IMAGE985, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, CYBER9320, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, CYBER9388, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, CYBER9520, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, CYBER9525DVD, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, CYBER9397, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, CYBER9397DVD, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, CYBERBLADEXPAi1, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, CYBERBLADEXPm8, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {PCI_VENDOR_ID_TRIDENT, CYBERBLADEXPm16, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
        {0,}
};

MODULE_DEVICE_TABLE(pci, trident_devices);

static struct pci_driver tridentfb_pci_driver = {
        .name = "tridentfb",
        .id_table = trident_devices,
        .probe = trident_pci_probe,
        .remove = trident_pci_remove,
};

/*
 * Parse user specified options (`video=trident:')
 * example:
 *      video=trident:800x600,bpp=16,noaccel
 */
#ifndef MODULE
static int __init tridentfb_setup(char *options)
{
        char *opt;
        if (!options || !*options)
                return 0;
        while ((opt = strsep(&options, ",")) != NULL) {
                if (!*opt)
                        continue;
                if (!strncmp(opt, "noaccel", 7))
                        noaccel = 1;
                else if (!strncmp(opt, "fp", 2))
                        fp = 1;
                else if (!strncmp(opt, "crt", 3))
                        fp = 0;
                else if (!strncmp(opt, "bpp=", 4))
                        bpp = simple_strtoul(opt + 4, NULL, 0);
                else if (!strncmp(opt, "center", 6))
                        center = 1;
                else if (!strncmp(opt, "stretch", 7))
                        stretch = 1;
                else if (!strncmp(opt, "memsize=", 8))
                        memsize = simple_strtoul(opt + 8, NULL, 0);
                else if (!strncmp(opt, "memdiff=", 8))
                        memdiff = simple_strtoul(opt + 8, NULL, 0);
                else if (!strncmp(opt, "nativex=", 8))
                        nativex = simple_strtoul(opt + 8, NULL, 0);
                else
                        mode_option = opt;
        }
        return 0;
}
#endif

static int __init tridentfb_init(void)
{
#ifndef MODULE
        char *option = NULL;

        if (fb_get_options("tridentfb", &option))
                return -ENODEV;
        tridentfb_setup(option);
#endif
        return pci_register_driver(&tridentfb_pci_driver);
}

static void __exit tridentfb_exit(void)
{
        pci_unregister_driver(&tridentfb_pci_driver);
}

module_init(tridentfb_init);
module_exit(tridentfb_exit);

MODULE_AUTHOR("Jani Monoses <jani@iv.ro>");
MODULE_DESCRIPTION("Framebuffer driver for Trident cards");
MODULE_LICENSE("GPL");
MODULE_ALIAS("cyblafb");