/* $Id: aty128fb.c,v 1.1.1.1.36.1 1999/12/11 09:03:05 Exp $
 *  linux/drivers/video/aty128fb.c -- Frame buffer device for ATI Rage128
 *
 *  Copyright (C) 1999-2003, Brad Douglas <brad@neruo.com>
 *  Copyright (C) 1999, Anthony Tong <atong@uiuc.edu>
 *
 *                Ani Joshi / Jeff Garzik
 *                      - Code cleanup
 *
 *                Michel Danzer <michdaen@iiic.ethz.ch>
 *                      - 15/16 bit cleanup
 *                      - fix panning
 *
 *                Benjamin Herrenschmidt
 *                      - pmac-specific PM stuff
 *                      - various fixes & cleanups
 *
 *                Andreas Hundt <andi@convergence.de>
 *                      - FB_ACTIVATE fixes
 *
 *                Paul Mackerras <paulus@samba.org>
 *                      - Convert to new framebuffer API,
 *                        fix colormap setting at 16 bits/pixel (565)
 *
 *                Paul Mundt 
 *                      - PCI hotplug
 *
 *                Jon Smirl <jonsmirl@yahoo.com>
 *                      - PCI ID update
 *                      - replace ROM BIOS search
 *
 *  Based off of Geert's atyfb.c and vfb.c.
 *
 *  TODO:
 *              - monitor sensing (DDC)
 *              - virtual display
 *              - other platform support (only ppc/x86 supported)
 *              - hardware cursor support
 *
 *    Please cc: your patches to brad@neruo.com.
 */

/*
 * A special note of gratitude to ATI's devrel for providing documentation,
 * example code and hardware. Thanks Nitya.     -atong and brad
 */


#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/uaccess.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/console.h>
#include <linux/backlight.h>
#include <asm/io.h>

#ifdef CONFIG_PPC_PMAC
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include "../macmodes.h"
#endif

#ifdef CONFIG_PMAC_BACKLIGHT
#include <asm/backlight.h>
#endif

#ifdef CONFIG_BOOTX_TEXT
#include <asm/btext.h>
#endif /* CONFIG_BOOTX_TEXT */

#ifdef CONFIG_MTRR
#include <asm/mtrr.h>
#endif

#include <video/aty128.h>

/* Debug flag */
#undef DEBUG

#ifdef DEBUG
#define DBG(fmt, args...)               printk(KERN_DEBUG "aty128fb: %s " fmt, __func__, ##args);
#else
#define DBG(fmt, args...)
#endif

#ifndef CONFIG_PPC_PMAC
/* default mode */
static struct fb_var_screeninfo default_var __devinitdata = {
        /* 640x480, 60 Hz, Non-Interlaced (25.175 MHz dotclock) */
        640, 480, 640, 480, 0, 0, 8, 0,
        {0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
        0, 0, -1, -1, 0, 39722, 48, 16, 33, 10, 96, 2,
        0, FB_VMODE_NONINTERLACED
};

#else /* CONFIG_PPC_PMAC */
/* default to 1024x768 at 75Hz on PPC - this will work
 * on the iMac, the usual 640x480 @ 60Hz doesn't. */
static struct fb_var_screeninfo default_var = {
        /* 1024x768, 75 Hz, Non-Interlaced (78.75 MHz dotclock) */
        1024, 768, 1024, 768, 0, 0, 8, 0,
        {0, 8, 0}, {0, 8, 0}, {0, 8, 0}, {0, 0, 0},
        0, 0, -1, -1, 0, 12699, 160, 32, 28, 1, 96, 3,
        FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
        FB_VMODE_NONINTERLACED
};
#endif /* CONFIG_PPC_PMAC */

/* default modedb mode */
/* 640x480, 60 Hz, Non-Interlaced (25.172 MHz dotclock) */
static struct fb_videomode defaultmode __devinitdata = {
        .refresh =      60,
        .xres =         640,
        .yres =         480,
        .pixclock =     39722,
        .left_margin =  48,
        .right_margin = 16,
        .upper_margin = 33,
        .lower_margin = 10,
        .hsync_len =    96,
        .vsync_len =    2,
        .sync =         0,
        .vmode =        FB_VMODE_NONINTERLACED
};

/* Chip generations */
enum {
        rage_128,
        rage_128_pci,
        rage_128_pro,
        rage_128_pro_pci,
        rage_M3,
        rage_M3_pci,
        rage_M4,
        rage_128_ultra,
};

/* Must match above enum */
static const char *r128_family[] __devinitdata = {
        "AGP",
        "PCI",
        "PRO AGP",
        "PRO PCI",
        "M3 AGP",
        "M3 PCI",
        "M4 AGP",
        "Ultra AGP",
};

/*
 * PCI driver prototypes
 */
static int aty128_probe(struct pci_dev *pdev,
                               const struct pci_device_id *ent);
static void aty128_remove(struct pci_dev *pdev);
static int aty128_pci_suspend(struct pci_dev *pdev, pm_message_t state);
static int aty128_pci_resume(struct pci_dev *pdev);
static int aty128_do_resume(struct pci_dev *pdev);

/* supported Rage128 chipsets */
static struct pci_device_id aty128_pci_tbl[] = {
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_LE,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_M3_pci },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_LF,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_M3 },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_MF,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_M4 },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_ML,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_M4 },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PA,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PB,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PC,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PD,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro_pci },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PE,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PF,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PG,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PH,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PI,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PJ,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PK,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PL,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PM,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PN,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PO,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PP,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro_pci },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PQ,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PR,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro_pci },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PS,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PT,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PU,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PV,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PW,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_PX,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pro },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_RE,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pci },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_RF,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128 },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_RG,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128 },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_RK,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pci },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_RL,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128 },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_SE,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128 },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_SF,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_pci },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_SG,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128 },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_SH,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128 },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_SK,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128 },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_SL,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128 },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_SM,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128 },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_SN,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128 },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_TF,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_ultra },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_TL,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_ultra },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_TR,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_ultra },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_TS,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_ultra },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_TT,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_ultra },
        { PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_RAGE128_TU,
          PCI_ANY_ID, PCI_ANY_ID, 0, 0, rage_128_ultra },
        { 0, }
};

MODULE_DEVICE_TABLE(pci, aty128_pci_tbl);

static struct pci_driver aty128fb_driver = {
        .name           = "aty128fb",
        .id_table       = aty128_pci_tbl,
        .probe          = aty128_probe,
        .remove         = __devexit_p(aty128_remove),
        .suspend        = aty128_pci_suspend,
        .resume         = aty128_pci_resume,
};

/* packed BIOS settings */
#ifndef CONFIG_PPC
typedef struct {
        u8 clock_chip_type;
        u8 struct_size;
        u8 accelerator_entry;
        u8 VGA_entry;
        u16 VGA_table_offset;
        u16 POST_table_offset;
        u16 XCLK;
        u16 MCLK;
        u8 num_PLL_blocks;
        u8 size_PLL_blocks;
        u16 PCLK_ref_freq;
        u16 PCLK_ref_divider;
        u32 PCLK_min_freq;
        u32 PCLK_max_freq;
        u16 MCLK_ref_freq;
        u16 MCLK_ref_divider;
        u32 MCLK_min_freq;
        u32 MCLK_max_freq;
        u16 XCLK_ref_freq;
        u16 XCLK_ref_divider;
        u32 XCLK_min_freq;
        u32 XCLK_max_freq;
} __attribute__ ((packed)) PLL_BLOCK;
#endif /* !CONFIG_PPC */

/* onboard memory information */
struct aty128_meminfo {
        u8 ML;
        u8 MB;
        u8 Trcd;
        u8 Trp;
        u8 Twr;
        u8 CL;
        u8 Tr2w;
        u8 LoopLatency;
        u8 DspOn;
        u8 Rloop;
        const char *name;
};

/* various memory configurations */
static const struct aty128_meminfo sdr_128   =
        { 4, 4, 3, 3, 1, 3, 1, 16, 30, 16, "128-bit SDR SGRAM (1:1)" };
static const struct aty128_meminfo sdr_64    =
        { 4, 8, 3, 3, 1, 3, 1, 17, 46, 17, "64-bit SDR SGRAM (1:1)" };
static const struct aty128_meminfo sdr_sgram =
        { 4, 4, 1, 2, 1, 2, 1, 16, 24, 16, "64-bit SDR SGRAM (2:1)" };
static const struct aty128_meminfo ddr_sgram =
        { 4, 4, 3, 3, 2, 3, 1, 16, 31, 16, "64-bit DDR SGRAM" };

static struct fb_fix_screeninfo aty128fb_fix __devinitdata = {
        .id             = "ATY Rage128",
        .type           = FB_TYPE_PACKED_PIXELS,
        .visual         = FB_VISUAL_PSEUDOCOLOR,
        .xpanstep       = 8,
        .ypanstep       = 1,
        .mmio_len       = 0x2000,
        .accel          = FB_ACCEL_ATI_RAGE128,
};

static char *mode_option __devinitdata = NULL;

#ifdef CONFIG_PPC_PMAC
static int default_vmode __devinitdata = VMODE_1024_768_60;
static int default_cmode __devinitdata = CMODE_8;
#endif

static int default_crt_on __devinitdata = 0;
static int default_lcd_on __devinitdata = 1;

#ifdef CONFIG_MTRR
static bool mtrr = true;
#endif

#ifdef CONFIG_PMAC_BACKLIGHT
static int backlight __devinitdata = 1;
#else
static int backlight __devinitdata = 0;
#endif

/* PLL constants */
struct aty128_constants {
        u32 ref_clk;
        u32 ppll_min;
        u32 ppll_max;
        u32 ref_divider;
        u32 xclk;
        u32 fifo_width;
        u32 fifo_depth;
};

struct aty128_crtc {
        u32 gen_cntl;
        u32 h_total, h_sync_strt_wid;
        u32 v_total, v_sync_strt_wid;
        u32 pitch;
        u32 offset, offset_cntl;
        u32 xoffset, yoffset;
        u32 vxres, vyres;
        u32 depth, bpp;
};

struct aty128_pll {
        u32 post_divider;
        u32 feedback_divider;
        u32 vclk;
};

struct aty128_ddafifo {
        u32 dda_config;
        u32 dda_on_off;
};

/* register values for a specific mode */
struct aty128fb_par {
        struct aty128_crtc crtc;
        struct aty128_pll pll;
        struct aty128_ddafifo fifo_reg;
        u32 accel_flags;
        struct aty128_constants constants;  /* PLL and others      */
        void __iomem *regbase;              /* remapped mmio       */
        u32 vram_size;                      /* onboard video ram   */
        int chip_gen;
        const struct aty128_meminfo *mem;   /* onboard mem info    */
#ifdef CONFIG_MTRR
        struct { int vram; int vram_valid; } mtrr;
#endif
        int blitter_may_be_busy;
        int fifo_slots;                 /* free slots in FIFO (64 max) */

        int     pm_reg;
        int crt_on, lcd_on;
        struct pci_dev *pdev;
        struct fb_info *next;
        int     asleep;
        int     lock_blank;

        u8      red[32];                /* see aty128fb_setcolreg */
        u8      green[64];
        u8      blue[32];
        u32     pseudo_palette[16];     /* used for TRUECOLOR */
};


#define round_div(n, d) ((n+(d/2))/d)

static int aty128fb_check_var(struct fb_var_screeninfo *var,
                              struct fb_info *info);
static int aty128fb_set_par(struct fb_info *info);
static int aty128fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
                              u_int transp, struct fb_info *info);
static int aty128fb_pan_display(struct fb_var_screeninfo *var,
                           struct fb_info *fb);
static int aty128fb_blank(int blank, struct fb_info *fb);
static int aty128fb_ioctl(struct fb_info *info, u_int cmd, unsigned long arg);
static int aty128fb_sync(struct fb_info *info);

    /*
     *  Internal routines
     */

static int aty128_encode_var(struct fb_var_screeninfo *var,
                             const struct aty128fb_par *par);
static int aty128_decode_var(struct fb_var_screeninfo *var,
                             struct aty128fb_par *par);
#if 0
static void __devinit aty128_get_pllinfo(struct aty128fb_par *par,
                                      void __iomem *bios);
static void __devinit __iomem *aty128_map_ROM(struct pci_dev *pdev, const struct aty128fb_par *par);
#endif
static void aty128_timings(struct aty128fb_par *par);
static void aty128_init_engine(struct aty128fb_par *par);
static void aty128_reset_engine(const struct aty128fb_par *par);
static void aty128_flush_pixel_cache(const struct aty128fb_par *par);
static void do_wait_for_fifo(u16 entries, struct aty128fb_par *par);
static void wait_for_fifo(u16 entries, struct aty128fb_par *par);
static void wait_for_idle(struct aty128fb_par *par);
static u32 depth_to_dst(u32 depth);

#ifdef CONFIG_FB_ATY128_BACKLIGHT
static void aty128_bl_set_power(struct fb_info *info, int power);
#endif

#define BIOS_IN8(v)     (readb(bios + (v)))
#define BIOS_IN16(v)    (readb(bios + (v)) | \
                          (readb(bios + (v) + 1) << 8))
#define BIOS_IN32(v)    (readb(bios + (v)) | \
                          (readb(bios + (v) + 1) << 8) | \
                          (readb(bios + (v) + 2) << 16) | \
                          (readb(bios + (v) + 3) << 24))


static struct fb_ops aty128fb_ops = {
        .owner          = THIS_MODULE,
        .fb_check_var   = aty128fb_check_var,
        .fb_set_par     = aty128fb_set_par,
        .fb_setcolreg   = aty128fb_setcolreg,
        .fb_pan_display = aty128fb_pan_display,
        .fb_blank       = aty128fb_blank,
        .fb_ioctl       = aty128fb_ioctl,
        .fb_sync        = aty128fb_sync,
        .fb_fillrect    = cfb_fillrect,
        .fb_copyarea    = cfb_copyarea,
        .fb_imageblit   = cfb_imageblit,
};

    /*
     * Functions to read from/write to the mmio registers
     *  - endian conversions may possibly be avoided by
     *    using the other register aperture. TODO.
     */
static inline u32 _aty_ld_le32(volatile unsigned int regindex, 
                               const struct aty128fb_par *par)
{
        return readl (par->regbase + regindex);
}

static inline void _aty_st_le32(volatile unsigned int regindex, u32 val, 
                                const struct aty128fb_par *par)
{
        writel (val, par->regbase + regindex);
}

static inline u8 _aty_ld_8(unsigned int regindex,
                           const struct aty128fb_par *par)
{
        return readb (par->regbase + regindex);
}

static inline void _aty_st_8(unsigned int regindex, u8 val,
                             const struct aty128fb_par *par)
{
        writeb (val, par->regbase + regindex);
}

#define aty_ld_le32(regindex)           _aty_ld_le32(regindex, par)
#define aty_st_le32(regindex, val)      _aty_st_le32(regindex, val, par)
#define aty_ld_8(regindex)              _aty_ld_8(regindex, par)
#define aty_st_8(regindex, val)         _aty_st_8(regindex, val, par)

    /*
     * Functions to read from/write to the pll registers
     */

#define aty_ld_pll(pll_index)           _aty_ld_pll(pll_index, par)
#define aty_st_pll(pll_index, val)      _aty_st_pll(pll_index, val, par)


static u32 _aty_ld_pll(unsigned int pll_index,
                       const struct aty128fb_par *par)
{       
        aty_st_8(CLOCK_CNTL_INDEX, pll_index & 0x3F);
        return aty_ld_le32(CLOCK_CNTL_DATA);
}

    
static void _aty_st_pll(unsigned int pll_index, u32 val,
                        const struct aty128fb_par *par)
{
        aty_st_8(CLOCK_CNTL_INDEX, (pll_index & 0x3F) | PLL_WR_EN);
        aty_st_le32(CLOCK_CNTL_DATA, val);
}


/* return true when the PLL has completed an atomic update */
static int aty_pll_readupdate(const struct aty128fb_par *par)
{
        return !(aty_ld_pll(PPLL_REF_DIV) & PPLL_ATOMIC_UPDATE_R);
}


static void aty_pll_wait_readupdate(const struct aty128fb_par *par)
{
        unsigned long timeout = jiffies + HZ/100; // should be more than enough
        int reset = 1;

        while (time_before(jiffies, timeout))
                if (aty_pll_readupdate(par)) {
                        reset = 0;
                        break;
                }

        if (reset)      /* reset engine?? */
                printk(KERN_DEBUG "aty128fb: PLL write timeout!\n");
}


/* tell PLL to update */
static void aty_pll_writeupdate(const struct aty128fb_par *par)
{
        aty_pll_wait_readupdate(par);

        aty_st_pll(PPLL_REF_DIV,
                   aty_ld_pll(PPLL_REF_DIV) | PPLL_ATOMIC_UPDATE_W);
}


/* write to the scratch register to test r/w functionality */
static int __devinit register_test(const struct aty128fb_par *par)
{
        u32 val;
        int flag = 0;

        val = aty_ld_le32(BIOS_0_SCRATCH);

        aty_st_le32(BIOS_0_SCRATCH, 0x55555555);
        if (aty_ld_le32(BIOS_0_SCRATCH) == 0x55555555) {
                aty_st_le32(BIOS_0_SCRATCH, 0xAAAAAAAA);

                if (aty_ld_le32(BIOS_0_SCRATCH) == 0xAAAAAAAA)
                        flag = 1; 
        }

        aty_st_le32(BIOS_0_SCRATCH, val);       // restore value
        return flag;
}


/*
 * Accelerator engine functions
 */
static void do_wait_for_fifo(u16 entries, struct aty128fb_par *par)
{
        int i;

        for (;;) {
                for (i = 0; i < 2000000; i++) {
                        par->fifo_slots = aty_ld_le32(GUI_STAT) & 0x0fff;
                        if (par->fifo_slots >= entries)
                                return;
                }
                aty128_reset_engine(par);
        }
}


static void wait_for_idle(struct aty128fb_par *par)
{
        int i;

        do_wait_for_fifo(64, par);

        for (;;) {
                for (i = 0; i < 2000000; i++) {
                        if (!(aty_ld_le32(GUI_STAT) & (1 << 31))) {
                                aty128_flush_pixel_cache(par);
                                par->blitter_may_be_busy = 0;
                                return;
                        }
                }
                aty128_reset_engine(par);
        }
}


static void wait_for_fifo(u16 entries, struct aty128fb_par *par)
{
        if (par->fifo_slots < entries)
                do_wait_for_fifo(64, par);
        par->fifo_slots -= entries;
}


static void aty128_flush_pixel_cache(const struct aty128fb_par *par)
{
        int i;
        u32 tmp;

        tmp = aty_ld_le32(PC_NGUI_CTLSTAT);
        tmp &= ~(0x00ff);
        tmp |= 0x00ff;
        aty_st_le32(PC_NGUI_CTLSTAT, tmp);

        for (i = 0; i < 2000000; i++)
                if (!(aty_ld_le32(PC_NGUI_CTLSTAT) & PC_BUSY))
                        break;
}


static void aty128_reset_engine(const struct aty128fb_par *par)
{
        u32 gen_reset_cntl, clock_cntl_index, mclk_cntl;

        aty128_flush_pixel_cache(par);

        clock_cntl_index = aty_ld_le32(CLOCK_CNTL_INDEX);
        mclk_cntl = aty_ld_pll(MCLK_CNTL);

        aty_st_pll(MCLK_CNTL, mclk_cntl | 0x00030000);

        gen_reset_cntl = aty_ld_le32(GEN_RESET_CNTL);
        aty_st_le32(GEN_RESET_CNTL, gen_reset_cntl | SOFT_RESET_GUI);
        aty_ld_le32(GEN_RESET_CNTL);
        aty_st_le32(GEN_RESET_CNTL, gen_reset_cntl & ~(SOFT_RESET_GUI));
        aty_ld_le32(GEN_RESET_CNTL);

        aty_st_pll(MCLK_CNTL, mclk_cntl);
        aty_st_le32(CLOCK_CNTL_INDEX, clock_cntl_index);
        aty_st_le32(GEN_RESET_CNTL, gen_reset_cntl);

        /* use old pio mode */
        aty_st_le32(PM4_BUFFER_CNTL, PM4_BUFFER_CNTL_NONPM4);

        DBG("engine reset");
}


static void aty128_init_engine(struct aty128fb_par *par)
{
        u32 pitch_value;

        wait_for_idle(par);

        /* 3D scaler not spoken here */
        wait_for_fifo(1, par);
        aty_st_le32(SCALE_3D_CNTL, 0x00000000);

        aty128_reset_engine(par);

        pitch_value = par->crtc.pitch;
        if (par->crtc.bpp == 24) {
                pitch_value = pitch_value * 3;
        }

        wait_for_fifo(4, par);
        /* setup engine offset registers */
        aty_st_le32(DEFAULT_OFFSET, 0x00000000);

        /* setup engine pitch registers */
        aty_st_le32(DEFAULT_PITCH, pitch_value);

        /* set the default scissor register to max dimensions */
        aty_st_le32(DEFAULT_SC_BOTTOM_RIGHT, (0x1FFF << 16) | 0x1FFF);

        /* set the drawing controls registers */
        aty_st_le32(DP_GUI_MASTER_CNTL,
                    GMC_SRC_PITCH_OFFSET_DEFAULT                |
                    GMC_DST_PITCH_OFFSET_DEFAULT                |
                    GMC_SRC_CLIP_DEFAULT                        |
                    GMC_DST_CLIP_DEFAULT                        |
                    GMC_BRUSH_SOLIDCOLOR                        |
                    (depth_to_dst(par->crtc.depth) << 8)        |
                    GMC_SRC_DSTCOLOR                    |
                    GMC_BYTE_ORDER_MSB_TO_LSB           |
                    GMC_DP_CONVERSION_TEMP_6500         |
                    ROP3_PATCOPY                                |
                    GMC_DP_SRC_RECT                             |
                    GMC_3D_FCN_EN_CLR                   |
                    GMC_DST_CLR_CMP_FCN_CLEAR           |
                    GMC_AUX_CLIP_CLEAR                  |
                    GMC_WRITE_MASK_SET);

        wait_for_fifo(8, par);
        /* clear the line drawing registers */
        aty_st_le32(DST_BRES_ERR, 0);
        aty_st_le32(DST_BRES_INC, 0);
        aty_st_le32(DST_BRES_DEC, 0);

        /* set brush color registers */
        aty_st_le32(DP_BRUSH_FRGD_CLR, 0xFFFFFFFF); /* white */
        aty_st_le32(DP_BRUSH_BKGD_CLR, 0x00000000); /* black */

        /* set source color registers */
        aty_st_le32(DP_SRC_FRGD_CLR, 0xFFFFFFFF);   /* white */
        aty_st_le32(DP_SRC_BKGD_CLR, 0x00000000);   /* black */

        /* default write mask */
        aty_st_le32(DP_WRITE_MASK, 0xFFFFFFFF);

        /* Wait for all the writes to be completed before returning */
        wait_for_idle(par);
}


/* convert depth values to their register representation */
static u32 depth_to_dst(u32 depth)
{
        if (depth <= 8)
                return DST_8BPP;
        else if (depth <= 15)
                return DST_15BPP;
        else if (depth == 16)
                return DST_16BPP;
        else if (depth <= 24)
                return DST_24BPP;
        else if (depth <= 32)
                return DST_32BPP;

        return -EINVAL;
}

/*
 * PLL informations retreival
 */


#ifndef __sparc__
static void __iomem * __devinit aty128_map_ROM(const struct aty128fb_par *par, struct pci_dev *dev)
{
        u16 dptr;
        u8 rom_type;
        void __iomem *bios;
        size_t rom_size;

        /* Fix from ATI for problem with Rage128 hardware not leaving ROM enabled */
        unsigned int temp;
        temp = aty_ld_le32(RAGE128_MPP_TB_CONFIG);
        temp &= 0x00ffffffu;
        temp |= 0x04 << 24;
        aty_st_le32(RAGE128_MPP_TB_CONFIG, temp);
        temp = aty_ld_le32(RAGE128_MPP_TB_CONFIG);

        bios = pci_map_rom(dev, &rom_size);

        if (!bios) {
                printk(KERN_ERR "aty128fb: ROM failed to map\n");
                return NULL;
        }

        /* Very simple test to make sure it appeared */
        if (BIOS_IN16(0) != 0xaa55) {
                printk(KERN_DEBUG "aty128fb: Invalid ROM signature %x should "
                        " be 0xaa55\n", BIOS_IN16(0));
                goto failed;
        }

        /* Look for the PCI data to check the ROM type */
        dptr = BIOS_IN16(0x18);

        /* Check the PCI data signature. If it's wrong, we still assume a normal x86 ROM
         * for now, until I've verified this works everywhere. The goal here is more
         * to phase out Open Firmware images.
         *
         * Currently, we only look at the first PCI data, we could iteratre and deal with
         * them all, and we should use fb_bios_start relative to start of image and not
         * relative start of ROM, but so far, I never found a dual-image ATI card
         *
         * typedef struct {
         *      u32     signature;      + 0x00
         *      u16     vendor;         + 0x04
         *      u16     device;         + 0x06
         *      u16     reserved_1;     + 0x08
         *      u16     dlen;           + 0x0a
         *      u8      drevision;      + 0x0c
         *      u8      class_hi;       + 0x0d
         *      u16     class_lo;       + 0x0e
         *      u16     ilen;           + 0x10
         *      u16     irevision;      + 0x12
         *      u8      type;           + 0x14
         *      u8      indicator;      + 0x15
         *      u16     reserved_2;     + 0x16
         * } pci_data_t;
         */
        if (BIOS_IN32(dptr) !=  (('R' << 24) | ('I' << 16) | ('C' << 8) | 'P')) {
                printk(KERN_WARNING "aty128fb: PCI DATA signature in ROM incorrect: %08x\n",
                       BIOS_IN32(dptr));
                goto anyway;
        }
        rom_type = BIOS_IN8(dptr + 0x14);
        switch(rom_type) {
        case 0:
                printk(KERN_INFO "aty128fb: Found Intel x86 BIOS ROM Image\n");
                break;
        case 1:
                printk(KERN_INFO "aty128fb: Found Open Firmware ROM Image\n");
                goto failed;
        case 2:
                printk(KERN_INFO "aty128fb: Found HP PA-RISC ROM Image\n");
                goto failed;
        default:
                printk(KERN_INFO "aty128fb: Found unknown type %d ROM Image\n", rom_type);
                goto failed;
        }
 anyway:
        return bios;

 failed:
        pci_unmap_rom(dev, bios);
        return NULL;
}

static void __devinit aty128_get_pllinfo(struct aty128fb_par *par, unsigned char __iomem *bios)
{
        unsigned int bios_hdr;
        unsigned int bios_pll;

        bios_hdr = BIOS_IN16(0x48);
        bios_pll = BIOS_IN16(bios_hdr + 0x30);
        
        par->constants.ppll_max = BIOS_IN32(bios_pll + 0x16);
        par->constants.ppll_min = BIOS_IN32(bios_pll + 0x12);
        par->constants.xclk = BIOS_IN16(bios_pll + 0x08);
        par->constants.ref_divider = BIOS_IN16(bios_pll + 0x10);
        par->constants.ref_clk = BIOS_IN16(bios_pll + 0x0e);

        DBG("ppll_max %d ppll_min %d xclk %d ref_divider %d ref clock %d\n",
                        par->constants.ppll_max, par->constants.ppll_min,
                        par->constants.xclk, par->constants.ref_divider,
                        par->constants.ref_clk);

}           

#ifdef CONFIG_X86
static void __iomem *  __devinit aty128_find_mem_vbios(struct aty128fb_par *par)
{
        /* I simplified this code as we used to miss the signatures in
         * a lot of case. It's now closer to XFree, we just don't check
         * for signatures at all... Something better will have to be done
         * if we end up having conflicts
         */
        u32  segstart;
        unsigned char __iomem *rom_base = NULL;
                                                
        for (segstart=0x000c0000; segstart<0x000f0000; segstart+=0x00001000) {
                rom_base = ioremap(segstart, 0x10000);
                if (rom_base == NULL)
                        return NULL;
                if (readb(rom_base) == 0x55 && readb(rom_base + 1) == 0xaa)
                        break;
                iounmap(rom_base);
                rom_base = NULL;
        }
        return rom_base;
}
#endif
#endif /* ndef(__sparc__) */

/* fill in known card constants if pll_block is not available */
static void __devinit aty128_timings(struct aty128fb_par *par)
{
#ifdef CONFIG_PPC_OF
        /* instead of a table lookup, assume OF has properly
         * setup the PLL registers and use their values
         * to set the XCLK values and reference divider values */

        u32 x_mpll_ref_fb_div;
        u32 xclk_cntl;
        u32 Nx, M;
        unsigned PostDivSet[] = { 0, 1, 2, 4, 8, 3, 6, 12 };
#endif

        if (!par->constants.ref_clk)
                par->constants.ref_clk = 2950;

#ifdef CONFIG_PPC_OF
        x_mpll_ref_fb_div = aty_ld_pll(X_MPLL_REF_FB_DIV);
        xclk_cntl = aty_ld_pll(XCLK_CNTL) & 0x7;
        Nx = (x_mpll_ref_fb_div & 0x00ff00) >> 8;
        M  = x_mpll_ref_fb_div & 0x0000ff;

        par->constants.xclk = round_div((2 * Nx * par->constants.ref_clk),
                                        (M * PostDivSet[xclk_cntl]));

        par->constants.ref_divider =
                aty_ld_pll(PPLL_REF_DIV) & PPLL_REF_DIV_MASK;
#endif

        if (!par->constants.ref_divider) {
                par->constants.ref_divider = 0x3b;

                aty_st_pll(X_MPLL_REF_FB_DIV, 0x004c4c1e);
                aty_pll_writeupdate(par);
        }
        aty_st_pll(PPLL_REF_DIV, par->constants.ref_divider);
        aty_pll_writeupdate(par);

        /* from documentation */
        if (!par->constants.ppll_min)
                par->constants.ppll_min = 12500;
        if (!par->constants.ppll_max)
                par->constants.ppll_max = 25000;    /* 23000 on some cards? */
        if (!par->constants.xclk)
                par->constants.xclk = 0x1d4d;        /* same as mclk */

        par->constants.fifo_width = 128;
        par->constants.fifo_depth = 32;

        switch (aty_ld_le32(MEM_CNTL) & 0x3) {
        case 0:
                par->mem = &sdr_128;
                break;
        case 1:
                par->mem = &sdr_sgram;
                break;
        case 2:
                par->mem = &ddr_sgram;
                break;
        default:
                par->mem = &sdr_sgram;
        }
}



/*
 * CRTC programming
 */

/* Program the CRTC registers */
static void aty128_set_crtc(const struct aty128_crtc *crtc,
                            const struct aty128fb_par *par)
{
        aty_st_le32(CRTC_GEN_CNTL, crtc->gen_cntl);
        aty_st_le32(CRTC_H_TOTAL_DISP, crtc->h_total);
        aty_st_le32(CRTC_H_SYNC_STRT_WID, crtc->h_sync_strt_wid);
        aty_st_le32(CRTC_V_TOTAL_DISP, crtc->v_total);
        aty_st_le32(CRTC_V_SYNC_STRT_WID, crtc->v_sync_strt_wid);
        aty_st_le32(CRTC_PITCH, crtc->pitch);
        aty_st_le32(CRTC_OFFSET, crtc->offset);
        aty_st_le32(CRTC_OFFSET_CNTL, crtc->offset_cntl);
        /* Disable ATOMIC updating.  Is this the right place? */
        aty_st_pll(PPLL_CNTL, aty_ld_pll(PPLL_CNTL) & ~(0x00030000));
}


static int aty128_var_to_crtc(const struct fb_var_screeninfo *var,

                              struct aty128_crtc *crtc,
                              const struct aty128fb_par *par)
{
        u32 xres, yres, vxres, vyres, xoffset, yoffset, bpp, dst;
        u32 left, right, upper, lower, hslen, vslen, sync, vmode;
        u32 h_total, h_disp, h_sync_strt, h_sync_wid, h_sync_pol;
        u32 v_total, v_disp, v_sync_strt, v_sync_wid, v_sync_pol, c_sync;
        u32 depth, bytpp;
        u8 mode_bytpp[7] = { 0, 0, 1, 2, 2, 3, 4 };

        /* input */
        xres = var->xres;
        yres = var->yres;
        vxres   = var->xres_virtual;
        vyres   = var->yres_virtual;
        xoffset = var->xoffset;
        yoffset = var->yoffset;
        bpp   = var->bits_per_pixel;
        left  = var->left_margin;
        right = var->right_margin;
        upper = var->upper_margin;
        lower = var->lower_margin;
        hslen = var->hsync_len;
        vslen = var->vsync_len;
        sync  = var->sync;
        vmode = var->vmode;

        if (bpp != 16)
                depth = bpp;
        else
                depth = (var->green.length == 6) ? 16 : 15;

        /* check for mode eligibility
         * accept only non interlaced modes */
        if ((vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED)
                return -EINVAL;

        /* convert (and round up) and validate */
        xres = (xres + 7) & ~7;
        xoffset = (xoffset + 7) & ~7;

        if (vxres < xres + xoffset)
                vxres = xres + xoffset;

        if (vyres < yres + yoffset)
                vyres = yres + yoffset;

        /* convert depth into ATI register depth */
        dst = depth_to_dst(depth);

        if (dst == -EINVAL) {
                printk(KERN_ERR "aty128fb: Invalid depth or RGBA\n");
                return -EINVAL;
        }

        /* convert register depth to bytes per pixel */
        bytpp = mode_bytpp[dst];

        /* make sure there is enough video ram for the mode */
        if ((u32)(vxres * vyres * bytpp) > par->vram_size) {
                printk(KERN_ERR "aty128fb: Not enough memory for mode\n");
                return -EINVAL;
        }

        h_disp = (xres >> 3) - 1;
        h_total = (((xres + right + hslen + left) >> 3) - 1) & 0xFFFFL;

        v_disp = yres - 1;
        v_total = (yres + upper + vslen + lower - 1) & 0xFFFFL;

        /* check to make sure h_total and v_total are in range */
        if (((h_total >> 3) - 1) > 0x1ff || (v_total - 1) > 0x7FF) {
                printk(KERN_ERR "aty128fb: invalid width ranges\n");
                return -EINVAL;
        }

        h_sync_wid = (hslen + 7) >> 3;
        if (h_sync_wid == 0)
                h_sync_wid = 1;
        else if (h_sync_wid > 0x3f)        /* 0x3f = max hwidth */
                h_sync_wid = 0x3f;

        h_sync_strt = (h_disp << 3) + right;

        v_sync_wid = vslen;
        if (v_sync_wid == 0)
                v_sync_wid = 1;
        else if (v_sync_wid > 0x1f)        /* 0x1f = max vwidth */
                v_sync_wid = 0x1f;
    
        v_sync_strt = v_disp + lower;

        h_sync_pol = sync & FB_SYNC_HOR_HIGH_ACT ? 0 : 1;
        v_sync_pol = sync & FB_SYNC_VERT_HIGH_ACT ? 0 : 1;
    
        c_sync = sync & FB_SYNC_COMP_HIGH_ACT ? (1 << 4) : 0;

        crtc->gen_cntl = 0x3000000L | c_sync | (dst << 8);

        crtc->h_total = h_total | (h_disp << 16);
        crtc->v_total = v_total | (v_disp << 16);

        crtc->h_sync_strt_wid = h_sync_strt | (h_sync_wid << 16) |
                (h_sync_pol << 23);
        crtc->v_sync_strt_wid = v_sync_strt | (v_sync_wid << 16) |
                (v_sync_pol << 23);

        crtc->pitch = vxres >> 3;

        crtc->offset = 0;

        if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW)
                crtc->offset_cntl = 0x00010000;
        else
                crtc->offset_cntl = 0;

        crtc->vxres = vxres;
        crtc->vyres = vyres;
        crtc->xoffset = xoffset;
        crtc->yoffset = yoffset;
        crtc->depth = depth;
        crtc->bpp = bpp;

        return 0;
}


static int aty128_pix_width_to_var(int pix_width, struct fb_var_screeninfo *var)
{

        /* fill in pixel info */
        var->red.msb_right = 0;
        var->green.msb_right = 0;
        var->blue.offset = 0;
        var->blue.msb_right = 0;
        var->transp.offset = 0;
        var->transp.length = 0;
        var->transp.msb_right = 0;
        switch (pix_width) {
        case CRTC_PIX_WIDTH_8BPP:
                var->bits_per_pixel = 8;
                var->red.offset = 0;
                var->red.length = 8;
                var->green.offset = 0;
                var->green.length = 8;
                var->blue.length = 8;
                break;
        case CRTC_PIX_WIDTH_15BPP:
                var->bits_per_pixel = 16;
                var->red.offset = 10;
                var->red.length = 5;
                var->green.offset = 5;
                var->green.length = 5;
                var->blue.length = 5;
                break;
        case CRTC_PIX_WIDTH_16BPP:
                var->bits_per_pixel = 16;
                var->red.offset = 11;
                var->red.length = 5;
                var->green.offset = 5;
                var->green.length = 6;
                var->blue.length = 5;
                break;
        case CRTC_PIX_WIDTH_24BPP:
                var->bits_per_pixel = 24;
                var->red.offset = 16;
                var->red.length = 8;
                var->green.offset = 8;
                var->green.length = 8;
                var->blue.length = 8;
                break;
        case CRTC_PIX_WIDTH_32BPP:
                var->bits_per_pixel = 32;
                var->red.offset = 16;
                var->red.length = 8;
                var->green.offset = 8;
                var->green.length = 8;
                var->blue.length = 8;
                var->transp.offset = 24;
                var->transp.length = 8;
                break;
        default:
                printk(KERN_ERR "aty128fb: Invalid pixel width\n");
                return -EINVAL;
        }

        return 0;
}


static int aty128_crtc_to_var(const struct aty128_crtc *crtc,
                              struct fb_var_screeninfo *var)
{
        u32 xres, yres, left, right, upper, lower, hslen, vslen, sync;
        u32 h_total, h_disp, h_sync_strt, h_sync_dly, h_sync_wid, h_sync_pol;
        u32 v_total, v_disp, v_sync_strt, v_sync_wid, v_sync_pol, c_sync;
        u32 pix_width;

        /* fun with masking */
        h_total     = crtc->h_total & 0x1ff;
        h_disp      = (crtc->h_total >> 16) & 0xff;
        h_sync_strt = (crtc->h_sync_strt_wid >> 3) & 0x1ff;
        h_sync_dly  = crtc->h_sync_strt_wid & 0x7;
        h_sync_wid  = (crtc->h_sync_strt_wid >> 16) & 0x3f;
        h_sync_pol  = (crtc->h_sync_strt_wid >> 23) & 0x1;
        v_total     = crtc->v_total & 0x7ff;
        v_disp      = (crtc->v_total >> 16) & 0x7ff;
        v_sync_strt = crtc->v_sync_strt_wid & 0x7ff;
        v_sync_wid  = (crtc->v_sync_strt_wid >> 16) & 0x1f;
        v_sync_pol  = (crtc->v_sync_strt_wid >> 23) & 0x1;
        c_sync      = crtc->gen_cntl & CRTC_CSYNC_EN ? 1 : 0;
        pix_width   = crtc->gen_cntl & CRTC_PIX_WIDTH_MASK;

        /* do conversions */
        xres  = (h_disp + 1) << 3;
        yres  = v_disp + 1;
        left  = ((h_total - h_sync_strt - h_sync_wid) << 3) - h_sync_dly;
        right = ((h_sync_strt - h_disp) << 3) + h_sync_dly;
        hslen = h_sync_wid << 3;
        upper = v_total - v_sync_strt - v_sync_wid;
        lower = v_sync_strt - v_disp;
        vslen = v_sync_wid;
        sync  = (h_sync_pol ? 0 : FB_SYNC_HOR_HIGH_ACT) |
                (v_sync_pol ? 0 : FB_SYNC_VERT_HIGH_ACT) |
                (c_sync ? FB_SYNC_COMP_HIGH_ACT : 0);

        aty128_pix_width_to_var(pix_width, var);

        var->xres = xres;
        var->yres = yres;
        var->xres_virtual = crtc->vxres;
        var->yres_virtual = crtc->vyres;
        var->xoffset = crtc->xoffset;
        var->yoffset = crtc->yoffset;
        var->left_margin  = left;
        var->right_margin = right;
        var->upper_margin = upper;
        var->lower_margin = lower;
        var->hsync_len = hslen;
        var->vsync_len = vslen;
        var->sync  = sync;
        var->vmode = FB_VMODE_NONINTERLACED;

        return 0;
}

static void aty128_set_crt_enable(struct aty128fb_par *par, int on)
{
        if (on) {
                aty_st_le32(CRTC_EXT_CNTL, aty_ld_le32(CRTC_EXT_CNTL) | CRT_CRTC_ON);
                aty_st_le32(DAC_CNTL, (aty_ld_le32(DAC_CNTL) | DAC_PALETTE2_SNOOP_EN));
        } else
                aty_st_le32(CRTC_EXT_CNTL, aty_ld_le32(CRTC_EXT_CNTL) & ~CRT_CRTC_ON);
}

static void aty128_set_lcd_enable(struct aty128fb_par *par, int on)
{
        u32 reg;
#ifdef CONFIG_FB_ATY128_BACKLIGHT
        struct fb_info *info = pci_get_drvdata(par->pdev);
#endif

        if (on) {
                reg = aty_ld_le32(LVDS_GEN_CNTL);
                reg |= LVDS_ON | LVDS_EN | LVDS_BLON | LVDS_DIGION;
                reg &= ~LVDS_DISPLAY_DIS;
                aty_st_le32(LVDS_GEN_CNTL, reg);
#ifdef CONFIG_FB_ATY128_BACKLIGHT
                aty128_bl_set_power(info, FB_BLANK_UNBLANK);
#endif  
        } else {
#ifdef CONFIG_FB_ATY128_BACKLIGHT
                aty128_bl_set_power(info, FB_BLANK_POWERDOWN);
#endif  
                reg = aty_ld_le32(LVDS_GEN_CNTL);
                reg |= LVDS_DISPLAY_DIS;
                aty_st_le32(LVDS_GEN_CNTL, reg);
                mdelay(100);
                reg &= ~(LVDS_ON /*| LVDS_EN*/);
                aty_st_le32(LVDS_GEN_CNTL, reg);
        }
}

static void aty128_set_pll(struct aty128_pll *pll, const struct aty128fb_par *par)
{
        u32 div3;

        unsigned char post_conv[] =     /* register values for post dividers */
        { 2, 0, 1, 4, 2, 2, 6, 2, 3, 2, 2, 2, 7 };

        /* select PPLL_DIV_3 */
        aty_st_le32(CLOCK_CNTL_INDEX, aty_ld_le32(CLOCK_CNTL_INDEX) | (3 << 8));

        /* reset PLL */
        aty_st_pll(PPLL_CNTL,
                   aty_ld_pll(PPLL_CNTL) | PPLL_RESET | PPLL_ATOMIC_UPDATE_EN);

        /* write the reference divider */
        aty_pll_wait_readupdate(par);
        aty_st_pll(PPLL_REF_DIV, par->constants.ref_divider & 0x3ff);
        aty_pll_writeupdate(par);

        div3 = aty_ld_pll(PPLL_DIV_3);
        div3 &= ~PPLL_FB3_DIV_MASK;
        div3 |= pll->feedback_divider;
        div3 &= ~PPLL_POST3_DIV_MASK;
        div3 |= post_conv[pll->post_divider] << 16;

        /* write feedback and post dividers */
        aty_pll_wait_readupdate(par);
        aty_st_pll(PPLL_DIV_3, div3);
        aty_pll_writeupdate(par);

        aty_pll_wait_readupdate(par);
        aty_st_pll(HTOTAL_CNTL, 0);     /* no horiz crtc adjustment */
        aty_pll_writeupdate(par);

        /* clear the reset, just in case */
        aty_st_pll(PPLL_CNTL, aty_ld_pll(PPLL_CNTL) & ~PPLL_RESET);
}


static int aty128_var_to_pll(u32 period_in_ps, struct aty128_pll *pll,
                             const struct aty128fb_par *par)
{
        const struct aty128_constants c = par->constants;
        unsigned char post_dividers[] = {1,2,4,8,3,6,12};
        u32 output_freq;
        u32 vclk;        /* in .01 MHz */
        int i = 0;
        u32 n, d;

        vclk = 100000000 / period_in_ps;        /* convert units to 10 kHz */

        /* adjust pixel clock if necessary */
        if (vclk > c.ppll_max)
                vclk = c.ppll_max;
        if (vclk * 12 < c.ppll_min)
                vclk = c.ppll_min/12;

        /* now, find an acceptable divider */
        for (i = 0; i < ARRAY_SIZE(post_dividers); i++) {
                output_freq = post_dividers[i] * vclk;
                if (output_freq >= c.ppll_min && output_freq <= c.ppll_max) {
                        pll->post_divider = post_dividers[i];
                        break;
                }
        }

        if (i == ARRAY_SIZE(post_dividers))
                return -EINVAL;

        /* calculate feedback divider */
        n = c.ref_divider * output_freq;
        d = c.ref_clk;

        pll->feedback_divider = round_div(n, d);
        pll->vclk = vclk;

        DBG("post %d feedback %d vlck %d output %d ref_divider %d "
            "vclk_per: %d\n", pll->post_divider,
            pll->feedback_divider, vclk, output_freq,
            c.ref_divider, period_in_ps);

        return 0;
}


static int aty128_pll_to_var(const struct aty128_pll *pll, struct fb_var_screeninfo *var)
{
        var->pixclock = 100000000 / pll->vclk;

        return 0;
}


static void aty128_set_fifo(const struct aty128_ddafifo *dsp,
                            const struct aty128fb_par *par)
{
        aty_st_le32(DDA_CONFIG, dsp->dda_config);
        aty_st_le32(DDA_ON_OFF, dsp->dda_on_off);
}


static int aty128_ddafifo(struct aty128_ddafifo *dsp,
                          const struct aty128_pll *pll,
                          u32 depth,
                          const struct aty128fb_par *par)
{
        const struct aty128_meminfo *m = par->mem;
        u32 xclk = par->constants.xclk;
        u32 fifo_width = par->constants.fifo_width;
        u32 fifo_depth = par->constants.fifo_depth;
        s32 x, b, p, ron, roff;
        u32 n, d, bpp;

        /* round up to multiple of 8 */
        bpp = (depth+7) & ~7;

        n = xclk * fifo_width;
        d = pll->vclk * bpp;
        x = round_div(n, d);

        ron = 4 * m->MB +
                3 * ((m->Trcd - 2 > 0) ? m->Trcd - 2 : 0) +
                2 * m->Trp +
                m->Twr +
                m->CL +
                m->Tr2w +
                x;

        DBG("x %x\n", x);

        b = 0;
        while (x) {
                x >>= 1;
                b++;
        }
        p = b + 1;

        ron <<= (11 - p);

        n <<= (11 - p);
        x = round_div(n, d);
        roff = x * (fifo_depth - 4);

        if ((ron + m->Rloop) >= roff) {
                printk(KERN_ERR "aty128fb: Mode out of range!\n");
                return -EINVAL;
        }

        DBG("p: %x rloop: %x x: %x ron: %x roff: %x\n",
            p, m->Rloop, x, ron, roff);

        dsp->dda_config = p << 16 | m->Rloop << 20 | x;
        dsp->dda_on_off = ron << 16 | roff;

        return 0;
}


/*
 * This actually sets the video mode.
 */
static int aty128fb_set_par(struct fb_info *info)
{ 
        struct aty128fb_par *par = info->par;
        u32 config;
        int err;

        if ((err = aty128_decode_var(&info->var, par)) != 0)
                return err;

        if (par->blitter_may_be_busy)
                wait_for_idle(par);

        /* clear all registers that may interfere with mode setting */
        aty_st_le32(OVR_CLR, 0);
        aty_st_le32(OVR_WID_LEFT_RIGHT, 0);
        aty_st_le32(OVR_WID_TOP_BOTTOM, 0);
        aty_st_le32(OV0_SCALE_CNTL, 0);
        aty_st_le32(MPP_TB_CONFIG, 0);
        aty_st_le32(MPP_GP_CONFIG, 0);
        aty_st_le32(SUBPIC_CNTL, 0);
        aty_st_le32(VIPH_CONTROL, 0);
        aty_st_le32(I2C_CNTL_1, 0);         /* turn off i2c */
        aty_st_le32(GEN_INT_CNTL, 0);   /* turn off interrupts */
        aty_st_le32(CAP0_TRIG_CNTL, 0);
        aty_st_le32(CAP1_TRIG_CNTL, 0);

        aty_st_8(CRTC_EXT_CNTL + 1, 4); /* turn video off */

        aty128_set_crtc(&par->crtc, par);
        aty128_set_pll(&par->pll, par);
        aty128_set_fifo(&par->fifo_reg, par);

        config = aty_ld_le32(CNFG_CNTL) & ~3;

#if defined(__BIG_ENDIAN)
        if (par->crtc.bpp == 32)
                config |= 2;    /* make aperture do 32 bit swapping */
        else if (par->crtc.bpp == 16)
                config |= 1;    /* make aperture do 16 bit swapping */
#endif

        aty_st_le32(CNFG_CNTL, config);
        aty_st_8(CRTC_EXT_CNTL + 1, 0); /* turn the video back on */

        info->fix.line_length = (par->crtc.vxres * par->crtc.bpp) >> 3;
        info->fix.visual = par->crtc.bpp == 8 ? FB_VISUAL_PSEUDOCOLOR
                : FB_VISUAL_DIRECTCOLOR;

        if (par->chip_gen == rage_M3) {
                aty128_set_crt_enable(par, par->crt_on);
                aty128_set_lcd_enable(par, par->lcd_on);
        }
        if (par->accel_flags & FB_ACCELF_TEXT)
                aty128_init_engine(par);

#ifdef CONFIG_BOOTX_TEXT
        btext_update_display(info->fix.smem_start,
                             (((par->crtc.h_total>>16) & 0xff)+1)*8,
                             ((par->crtc.v_total>>16) & 0x7ff)+1,
                             par->crtc.bpp,
                             par->crtc.vxres*par->crtc.bpp/8);
#endif /* CONFIG_BOOTX_TEXT */

        return 0;
}

/*
 *  encode/decode the User Defined Part of the Display
 */

static int aty128_decode_var(struct fb_var_screeninfo *var, struct aty128fb_par *par)
{
        int err;
        struct aty128_crtc crtc;
        struct aty128_pll pll;
        struct aty128_ddafifo fifo_reg;

        if ((err = aty128_var_to_crtc(var, &crtc, par)))
                return err;

        if ((err = aty128_var_to_pll(var->pixclock, &pll, par)))
                return err;

        if ((err = aty128_ddafifo(&fifo_reg, &pll, crtc.depth, par)))
                return err;

        par->crtc = crtc;
        par->pll = pll;
        par->fifo_reg = fifo_reg;
        par->accel_flags = var->accel_flags;

        return 0;
}


static int aty128_encode_var(struct fb_var_screeninfo *var,
                             const struct aty128fb_par *par)
{
        int err;

        if ((err = aty128_crtc_to_var(&par->crtc, var)))
                return err;

        if ((err = aty128_pll_to_var(&par->pll, var)))
                return err;

        var->nonstd = 0;
        var->activate = 0;

        var->height = -1;
        var->width = -1;
        var->accel_flags = par->accel_flags;

        return 0;
}           


static int aty128fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
{
        struct aty128fb_par par;
        int err;

        par = *(struct aty128fb_par *)info->par;
        if ((err = aty128_decode_var(var, &par)) != 0)
                return err;
        aty128_encode_var(var, &par);
        return 0;
}


/*
 *  Pan or Wrap the Display
 */
static int aty128fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *fb) 
{
        struct aty128fb_par *par = fb->par;
        u32 xoffset, yoffset;
        u32 offset;
        u32 xres, yres;

        xres = (((par->crtc.h_total >> 16) & 0xff) + 1) << 3;
        yres = ((par->crtc.v_total >> 16) & 0x7ff) + 1;

        xoffset = (var->xoffset +7) & ~7;
        yoffset = var->yoffset;

        if (xoffset+xres > par->crtc.vxres || yoffset+yres > par->crtc.vyres)
                return -EINVAL;

        par->crtc.xoffset = xoffset;
        par->crtc.yoffset = yoffset;

        offset = ((yoffset * par->crtc.vxres + xoffset)*(par->crtc.bpp >> 3)) & ~7;

        if (par->crtc.bpp == 24)
                offset += 8 * (offset % 3); /* Must be multiple of 8 and 3 */

        aty_st_le32(CRTC_OFFSET, offset);

        return 0;
}


/*
 *  Helper function to store a single palette register
 */
static void aty128_st_pal(u_int regno, u_int red, u_int green, u_int blue,
                          struct aty128fb_par *par)
{
        if (par->chip_gen == rage_M3) {
#if 0
                /* Note: For now, on M3, we set palette on both heads, which may
                 * be useless. Can someone with a M3 check this ?
                 * 
                 * This code would still be useful if using the second CRTC to 
                 * do mirroring
                 */

                aty_st_le32(DAC_CNTL, aty_ld_le32(DAC_CNTL) | DAC_PALETTE_ACCESS_CNTL);
                aty_st_8(PALETTE_INDEX, regno);
                aty_st_le32(PALETTE_DATA, (red<<16)|(green<<8)|blue);
#endif
                aty_st_le32(DAC_CNTL, aty_ld_le32(DAC_CNTL) & ~DAC_PALETTE_ACCESS_CNTL);
        }

        aty_st_8(PALETTE_INDEX, regno);
        aty_st_le32(PALETTE_DATA, (red<<16)|(green<<8)|blue);
}

static int aty128fb_sync(struct fb_info *info)
{
        struct aty128fb_par *par = info->par;

        if (par->blitter_may_be_busy)
                wait_for_idle(par);
        return 0;
}

#ifndef MODULE
static int __devinit aty128fb_setup(char *options)
{
        char *this_opt;

        if (!options || !*options)
                return 0;

        while ((this_opt = strsep(&options, ",")) != NULL) {
                if (!strncmp(this_opt, "lcd:", 4)) {
                        default_lcd_on = simple_strtoul(this_opt+4, NULL, 0);
                        continue;
                } else if (!strncmp(this_opt, "crt:", 4)) {
                        default_crt_on = simple_strtoul(this_opt+4, NULL, 0);
                        continue;
                } else if (!strncmp(this_opt, "backlight:", 10)) {
                        backlight = simple_strtoul(this_opt+10, NULL, 0);
                        continue;
                }
#ifdef CONFIG_MTRR
                if(!strncmp(this_opt, "nomtrr", 6)) {
                        mtrr = 0;
                        continue;
                }
#endif
#ifdef CONFIG_PPC_PMAC
                /* vmode and cmode deprecated */
                if (!strncmp(this_opt, "vmode:", 6)) {
                        unsigned int vmode = simple_strtoul(this_opt+6, NULL, 0);
                        if (vmode > 0 && vmode <= VMODE_MAX)
                                default_vmode = vmode;
                        continue;
                } else if (!strncmp(this_opt, "cmode:", 6)) {
                        unsigned int cmode = simple_strtoul(this_opt+6, NULL, 0);
                        switch (cmode) {
                        case 0:
                        case 8:
                                default_cmode = CMODE_8;
                                break;
                        case 15:
                        case 16:
                                default_cmode = CMODE_16;
                                break;
                        case 24:
                        case 32:
                                default_cmode = CMODE_32;
                                break;
                        }
                        continue;
                }
#endif /* CONFIG_PPC_PMAC */
                mode_option = this_opt;
        }
        return 0;
}
#endif  /*  MODULE  */

/* Backlight */
#ifdef CONFIG_FB_ATY128_BACKLIGHT
#define MAX_LEVEL 0xFF

static int aty128_bl_get_level_brightness(struct aty128fb_par *par,
                int level)
{
        struct fb_info *info = pci_get_drvdata(par->pdev);
        int atylevel;

        /* Get and convert the value */
        /* No locking of bl_curve since we read a single value */
        atylevel = MAX_LEVEL -
                (info->bl_curve[level] * FB_BACKLIGHT_MAX / MAX_LEVEL);

        if (atylevel < 0)
                atylevel = 0;
        else if (atylevel > MAX_LEVEL)
                atylevel = MAX_LEVEL;

        return atylevel;
}

/* We turn off the LCD completely instead of just dimming the backlight.
 * This provides greater power saving and the display is useless without
 * backlight anyway
 */
#define BACKLIGHT_LVDS_OFF
/* That one prevents proper CRT output with LCD off */
#undef BACKLIGHT_DAC_OFF

static int aty128_bl_update_status(struct backlight_device *bd)
{
        struct aty128fb_par *par = bl_get_data(bd);
        unsigned int reg = aty_ld_le32(LVDS_GEN_CNTL);
        int level;

        if (bd->props.power != FB_BLANK_UNBLANK ||
            bd->props.fb_blank != FB_BLANK_UNBLANK ||
            !par->lcd_on)
                level = 0;
        else
                level = bd->props.brightness;

        reg |= LVDS_BL_MOD_EN | LVDS_BLON;
        if (level > 0) {
                reg |= LVDS_DIGION;
                if (!(reg & LVDS_ON)) {
                        reg &= ~LVDS_BLON;
                        aty_st_le32(LVDS_GEN_CNTL, reg);
                        aty_ld_le32(LVDS_GEN_CNTL);
                        mdelay(10);
                        reg |= LVDS_BLON;
                        aty_st_le32(LVDS_GEN_CNTL, reg);
                }
                reg &= ~LVDS_BL_MOD_LEVEL_MASK;
                reg |= (aty128_bl_get_level_brightness(par, level) << LVDS_BL_MOD_LEVEL_SHIFT);
#ifdef BACKLIGHT_LVDS_OFF
                reg |= LVDS_ON | LVDS_EN;
                reg &= ~LVDS_DISPLAY_DIS;
#endif
                aty_st_le32(LVDS_GEN_CNTL, reg);
#ifdef BACKLIGHT_DAC_OFF
                aty_st_le32(DAC_CNTL, aty_ld_le32(DAC_CNTL) & (~DAC_PDWN));
#endif
        } else {
                reg &= ~LVDS_BL_MOD_LEVEL_MASK;
                reg |= (aty128_bl_get_level_brightness(par, 0) << LVDS_BL_MOD_LEVEL_SHIFT);
#ifdef BACKLIGHT_LVDS_OFF
                reg |= LVDS_DISPLAY_DIS;
                aty_st_le32(LVDS_GEN_CNTL, reg);
                aty_ld_le32(LVDS_GEN_CNTL);
                udelay(10);
                reg &= ~(LVDS_ON | LVDS_EN | LVDS_BLON | LVDS_DIGION);
#endif
                aty_st_le32(LVDS_GEN_CNTL, reg);
#ifdef BACKLIGHT_DAC_OFF
                aty_st_le32(DAC_CNTL, aty_ld_le32(DAC_CNTL) | DAC_PDWN);
#endif
        }

        return 0;
}

static int aty128_bl_get_brightness(struct backlight_device *bd)
{
        return bd->props.brightness;
}

static const struct backlight_ops aty128_bl_data = {
        .get_brightness = aty128_bl_get_brightness,
        .update_status  = aty128_bl_update_status,
};

static void aty128_bl_set_power(struct fb_info *info, int power)
{
        if (info->bl_dev) {
                info->bl_dev->props.power = power;
                backlight_update_status(info->bl_dev);
        }
}

static void aty128_bl_init(struct aty128fb_par *par)
{
        struct backlight_properties props;
        struct fb_info *info = pci_get_drvdata(par->pdev);
        struct backlight_device *bd;
        char name[12];

        /* Could be extended to Rage128Pro LVDS output too */
        if (par->chip_gen != rage_M3)
                return;

#ifdef CONFIG_PMAC_BACKLIGHT
        if (!pmac_has_backlight_type("ati"))
                return;
#endif

        snprintf(name, sizeof(name), "aty128bl%d", info->node);

        memset(&props, 0, sizeof(struct backlight_properties));
        props.type = BACKLIGHT_RAW;
        props.max_brightness = FB_BACKLIGHT_LEVELS - 1;
        bd = backlight_device_register(name, info->dev, par, &aty128_bl_data,
                                       &props);
        if (IS_ERR(bd)) {
                info->bl_dev = NULL;
                printk(KERN_WARNING "aty128: Backlight registration failed\n");
                goto error;
        }

        info->bl_dev = bd;
        fb_bl_default_curve(info, 0,
                 63 * FB_BACKLIGHT_MAX / MAX_LEVEL,
                219 * FB_BACKLIGHT_MAX / MAX_LEVEL);

        bd->props.brightness = bd->props.max_brightness;
        bd->props.power = FB_BLANK_UNBLANK;
        backlight_update_status(bd);

        printk("aty128: Backlight initialized (%s)\n", name);

        return;

error:
        return;
}

static void aty128_bl_exit(struct backlight_device *bd)
{
        backlight_device_unregister(bd);
        printk("aty128: Backlight unloaded\n");
}
#endif /* CONFIG_FB_ATY128_BACKLIGHT */

/*
 *  Initialisation
 */

#ifdef CONFIG_PPC_PMAC__disabled
static void aty128_early_resume(void *data)
{
        struct aty128fb_par *par = data;

        if (!console_trylock())
                return;
        pci_restore_state(par->pdev);
        aty128_do_resume(par->pdev);
        console_unlock();
}
#endif /* CONFIG_PPC_PMAC */

static int __devinit aty128_init(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        struct fb_info *info = pci_get_drvdata(pdev);
        struct aty128fb_par *par = info->par;
        struct fb_var_screeninfo var;
        char video_card[50];
        u8 chip_rev;
        u32 dac;

        /* Get the chip revision */
        chip_rev = (aty_ld_le32(CNFG_CNTL) >> 16) & 0x1F;

        strcpy(video_card, "Rage128 XX ");
        video_card[8] = ent->device >> 8;
        video_card[9] = ent->device & 0xFF;

        /* range check to make sure */
        if (ent->driver_data < ARRAY_SIZE(r128_family))
            strlcat(video_card, r128_family[ent->driver_data], sizeof(video_card));

        printk(KERN_INFO "aty128fb: %s [chip rev 0x%x] ", video_card, chip_rev);

        if (par->vram_size % (1024 * 1024) == 0)
                printk("%dM %s\n", par->vram_size / (1024*1024), par->mem->name);
        else
                printk("%dk %s\n", par->vram_size / 1024, par->mem->name);

        par->chip_gen = ent->driver_data;

        /* fill in info */
        info->fbops = &aty128fb_ops;
        info->flags = FBINFO_FLAG_DEFAULT;

        par->lcd_on = default_lcd_on;
        par->crt_on = default_crt_on;

        var = default_var;
#ifdef CONFIG_PPC_PMAC
        if (machine_is(powermac)) {
                /* Indicate sleep capability */
                if (par->chip_gen == rage_M3) {
                        pmac_call_feature(PMAC_FTR_DEVICE_CAN_WAKE, NULL, 0, 1);
#if 0 /* Disable the early video resume hack for now as it's causing problems, among
       * others we now rely on the PCI core restoring the config space for us, which
       * isn't the case with that hack, and that code path causes various things to
       * be called with interrupts off while they shouldn't. I'm leaving the code in
       * as it can be useful for debugging purposes
       */
                        pmac_set_early_video_resume(aty128_early_resume, par);
#endif
                }

                /* Find default mode */
                if (mode_option) {
                        if (!mac_find_mode(&var, info, mode_option, 8))
                                var = default_var;
                } else {
                        if (default_vmode <= 0 || default_vmode > VMODE_MAX)
                                default_vmode = VMODE_1024_768_60;

                        /* iMacs need that resolution
                         * PowerMac2,1 first r128 iMacs
                         * PowerMac2,2 summer 2000 iMacs
                         * PowerMac4,1 january 2001 iMacs "flower power"
                         */
                        if (of_machine_is_compatible("PowerMac2,1") ||
                            of_machine_is_compatible("PowerMac2,2") ||
                            of_machine_is_compatible("PowerMac4,1"))
                                default_vmode = VMODE_1024_768_75;

                        /* iBook SE */
                        if (of_machine_is_compatible("PowerBook2,2"))
                                default_vmode = VMODE_800_600_60;

                        /* PowerBook Firewire (Pismo), iBook Dual USB */
                        if (of_machine_is_compatible("PowerBook3,1") ||
                            of_machine_is_compatible("PowerBook4,1"))
                                default_vmode = VMODE_1024_768_60;

                        /* PowerBook Titanium */
                        if (of_machine_is_compatible("PowerBook3,2"))
                                default_vmode = VMODE_1152_768_60;
        
                        if (default_cmode > 16) 
                            default_cmode = CMODE_32;
                        else if (default_cmode > 8) 
                            default_cmode = CMODE_16;
                        else 
                            default_cmode = CMODE_8;

                        if (mac_vmode_to_var(default_vmode, default_cmode, &var))
                                var = default_var;
                }
        } else
#endif /* CONFIG_PPC_PMAC */
        {
                if (mode_option)
                        if (fb_find_mode(&var, info, mode_option, NULL, 
                                         0, &defaultmode, 8) == 0)
                                var = default_var;
        }

        var.accel_flags &= ~FB_ACCELF_TEXT;
//      var.accel_flags |= FB_ACCELF_TEXT;/* FIXME Will add accel later */

        if (aty128fb_check_var(&var, info)) {
                printk(KERN_ERR "aty128fb: Cannot set default mode.\n");
                return 0;
        }

        /* setup the DAC the way we like it */
        dac = aty_ld_le32(DAC_CNTL);
        dac |= (DAC_8BIT_EN | DAC_RANGE_CNTL);
        dac |= DAC_MASK;
        if (par->chip_gen == rage_M3)
                dac |= DAC_PALETTE2_SNOOP_EN;
        aty_st_le32(DAC_CNTL, dac);

        /* turn off bus mastering, just in case */
        aty_st_le32(BUS_CNTL, aty_ld_le32(BUS_CNTL) | BUS_MASTER_DIS);

        info->var = var;
        fb_alloc_cmap(&info->cmap, 256, 0);

        var.activate = FB_ACTIVATE_NOW;

        aty128_init_engine(par);

        par->pm_reg = pci_find_capability(pdev, PCI_CAP_ID_PM);

        par->pdev = pdev;
        par->asleep = 0;
        par->lock_blank = 0;

#ifdef CONFIG_FB_ATY128_BACKLIGHT
        if (backlight)
                aty128_bl_init(par);
#endif

        if (register_framebuffer(info) < 0)
                return 0;

        printk(KERN_INFO "fb%d: %s frame buffer device on %s\n",
               info->node, info->fix.id, video_card);

        return 1;       /* success! */
}

#ifdef CONFIG_PCI
/* register a card    ++ajoshi */
static int __devinit aty128_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        unsigned long fb_addr, reg_addr;
        struct aty128fb_par *par;
        struct fb_info *info;
        int err;
#ifndef __sparc__
        void __iomem *bios = NULL;
#endif

        /* Enable device in PCI config */
        if ((err = pci_enable_device(pdev))) {
                printk(KERN_ERR "aty128fb: Cannot enable PCI device: %d\n",
                                err);
                return -ENODEV;
        }

        fb_addr = pci_resource_start(pdev, 0);
        if (!request_mem_region(fb_addr, pci_resource_len(pdev, 0),
                                "aty128fb FB")) {
                printk(KERN_ERR "aty128fb: cannot reserve frame "
                                "buffer memory\n");
                return -ENODEV;
        }

        reg_addr = pci_resource_start(pdev, 2);
        if (!request_mem_region(reg_addr, pci_resource_len(pdev, 2),
                                "aty128fb MMIO")) {
                printk(KERN_ERR "aty128fb: cannot reserve MMIO region\n");
                goto err_free_fb;
        }

        /* We have the resources. Now virtualize them */
        info = framebuffer_alloc(sizeof(struct aty128fb_par), &pdev->dev);
        if (info == NULL) {
                printk(KERN_ERR "aty128fb: can't alloc fb_info_aty128\n");
                goto err_free_mmio;
        }
        par = info->par;

        info->pseudo_palette = par->pseudo_palette;

        /* Virtualize mmio region */
        info->fix.mmio_start = reg_addr;
        par->regbase = pci_ioremap_bar(pdev, 2);
        if (!par->regbase)
                goto err_free_info;

        /* Grab memory size from the card */
        // How does this relate to the resource length from the PCI hardware?
        par->vram_size = aty_ld_le32(CNFG_MEMSIZE) & 0x03FFFFFF;

        /* Virtualize the framebuffer */
        info->screen_base = ioremap(fb_addr, par->vram_size);
        if (!info->screen_base)
                goto err_unmap_out;

        /* Set up info->fix */
        info->fix = aty128fb_fix;
        info->fix.smem_start = fb_addr;
        info->fix.smem_len = par->vram_size;
        info->fix.mmio_start = reg_addr;

        /* If we can't test scratch registers, something is seriously wrong */
        if (!register_test(par)) {
                printk(KERN_ERR "aty128fb: Can't write to video register!\n");
                goto err_out;
        }

#ifndef __sparc__
        bios = aty128_map_ROM(par, pdev);
#ifdef CONFIG_X86
        if (bios == NULL)
                bios = aty128_find_mem_vbios(par);
#endif
        if (bios == NULL)
                printk(KERN_INFO "aty128fb: BIOS not located, guessing timings.\n");
        else {
                printk(KERN_INFO "aty128fb: Rage128 BIOS located\n");
                aty128_get_pllinfo(par, bios);
                pci_unmap_rom(pdev, bios);
        }
#endif /* __sparc__ */

        aty128_timings(par);
        pci_set_drvdata(pdev, info);

        if (!aty128_init(pdev, ent))
                goto err_out;

#ifdef CONFIG_MTRR
        if (mtrr) {
                par->mtrr.vram = mtrr_add(info->fix.smem_start,
                                par->vram_size, MTRR_TYPE_WRCOMB, 1);
                par->mtrr.vram_valid = 1;
                /* let there be speed */
                printk(KERN_INFO "aty128fb: Rage128 MTRR set to ON\n");
        }
#endif /* CONFIG_MTRR */
        return 0;

err_out:
        iounmap(info->screen_base);
err_unmap_out:
        iounmap(par->regbase);
err_free_info:
        framebuffer_release(info);
err_free_mmio:
        release_mem_region(pci_resource_start(pdev, 2),
                        pci_resource_len(pdev, 2));
err_free_fb:
        release_mem_region(pci_resource_start(pdev, 0),
                        pci_resource_len(pdev, 0));
        return -ENODEV;
}

static void __devexit aty128_remove(struct pci_dev *pdev)
{
        struct fb_info *info = pci_get_drvdata(pdev);
        struct aty128fb_par *par;

        if (!info)
                return;

        par = info->par;

        unregister_framebuffer(info);

#ifdef CONFIG_FB_ATY128_BACKLIGHT
        aty128_bl_exit(info->bl_dev);
#endif

#ifdef CONFIG_MTRR
        if (par->mtrr.vram_valid)
                mtrr_del(par->mtrr.vram, info->fix.smem_start,
                         par->vram_size);
#endif /* CONFIG_MTRR */
        iounmap(par->regbase);
        iounmap(info->screen_base);

        release_mem_region(pci_resource_start(pdev, 0),
                           pci_resource_len(pdev, 0));
        release_mem_region(pci_resource_start(pdev, 2),
                           pci_resource_len(pdev, 2));
        framebuffer_release(info);
}
#endif /* CONFIG_PCI */



    /*
     *  Blank the display.
     */
static int aty128fb_blank(int blank, struct fb_info *fb)
{
        struct aty128fb_par *par = fb->par;
        u8 state;

        if (par->lock_blank || par->asleep)
                return 0;

        switch (blank) {
        case FB_BLANK_NORMAL:
                state = 4;
                break;
        case FB_BLANK_VSYNC_SUSPEND:
                state = 6;
                break;
        case FB_BLANK_HSYNC_SUSPEND:
                state = 5;
                break;
        case FB_BLANK_POWERDOWN:
                state = 7;
                break;
        case FB_BLANK_UNBLANK:
        default:
                state = 0;
                break;
        }
        aty_st_8(CRTC_EXT_CNTL+1, state);

        if (par->chip_gen == rage_M3) {
                aty128_set_crt_enable(par, par->crt_on && !blank);
                aty128_set_lcd_enable(par, par->lcd_on && !blank);
        }

        return 0;
}

/*
 *  Set a single color register. The values supplied are already
 *  rounded down to the hardware's capabilities (according to the
 *  entries in the var structure). Return != 0 for invalid regno.
 */
static int aty128fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
                              u_int transp, struct fb_info *info)
{
        struct aty128fb_par *par = info->par;

        if (regno > 255
            || (par->crtc.depth == 16 && regno > 63)
            || (par->crtc.depth == 15 && regno > 31))
                return 1;

        red >>= 8;
        green >>= 8;
        blue >>= 8;

        if (regno < 16) {
                int i;
                u32 *pal = info->pseudo_palette;

                switch (par->crtc.depth) {
                case 15:
                        pal[regno] = (regno << 10) | (regno << 5) | regno;
                        break;
                case 16:
                        pal[regno] = (regno << 11) | (regno << 6) | regno;
                        break;
                case 24:
                        pal[regno] = (regno << 16) | (regno << 8) | regno;
                        break;
                case 32:
                        i = (regno << 8) | regno;
                        pal[regno] = (i << 16) | i;
                        break;
                }
        }

        if (par->crtc.depth == 16 && regno > 0) {
                /*
                 * With the 5-6-5 split of bits for RGB at 16 bits/pixel, we
                 * have 32 slots for R and B values but 64 slots for G values.
                 * Thus the R and B values go in one slot but the G value
                 * goes in a different slot, and we have to avoid disturbing
                 * the other fields in the slots we touch.
                 */
                par->green[regno] = green;
                if (regno < 32) {
                        par->red[regno] = red;
                        par->blue[regno] = blue;
                        aty128_st_pal(regno * 8, red, par->green[regno*2],
                                      blue, par);
                }
                red = par->red[regno/2];
                blue = par->blue[regno/2];
                regno <<= 2;
        } else if (par->crtc.bpp == 16)
                regno <<= 3;
        aty128_st_pal(regno, red, green, blue, par);

        return 0;
}

#define ATY_MIRROR_LCD_ON       0x00000001
#define ATY_MIRROR_CRT_ON       0x00000002

/* out param: u32*      backlight value: 0 to 15 */
#define FBIO_ATY128_GET_MIRROR  _IOR('@', 1, __u32)
/* in param: u32*       backlight value: 0 to 15 */
#define FBIO_ATY128_SET_MIRROR  _IOW('@', 2, __u32)

static int aty128fb_ioctl(struct fb_info *info, u_int cmd, u_long arg)
{
        struct aty128fb_par *par = info->par;
        u32 value;
        int rc;
    
        switch (cmd) {
        case FBIO_ATY128_SET_MIRROR:
                if (par->chip_gen != rage_M3)
                        return -EINVAL;
                rc = get_user(value, (__u32 __user *)arg);
                if (rc)
                        return rc;
                par->lcd_on = (value & 0x01) != 0;
                par->crt_on = (value & 0x02) != 0;
                if (!par->crt_on && !par->lcd_on)
                        par->lcd_on = 1;
                aty128_set_crt_enable(par, par->crt_on);        
                aty128_set_lcd_enable(par, par->lcd_on);        
                return 0;
        case FBIO_ATY128_GET_MIRROR:
                if (par->chip_gen != rage_M3)
                        return -EINVAL;
                value = (par->crt_on << 1) | par->lcd_on;
                return put_user(value, (__u32 __user *)arg);
        }
        return -EINVAL;
}

#if 0
    /*
     *  Accelerated functions
     */

static inline void aty128_rectcopy(int srcx, int srcy, int dstx, int dsty,
                                   u_int width, u_int height,
                                   struct fb_info_aty128 *par)
{
    u32 save_dp_datatype, save_dp_cntl, dstval;

    if (!width || !height)
        return;

    dstval = depth_to_dst(par->current_par.crtc.depth);
    if (dstval == DST_24BPP) {
        srcx *= 3;
        dstx *= 3;
        width *= 3;
    } else if (dstval == -EINVAL) {
        printk("aty128fb: invalid depth or RGBA\n");
        return;
    }

    wait_for_fifo(2, par);
    save_dp_datatype = aty_ld_le32(DP_DATATYPE);
    save_dp_cntl     = aty_ld_le32(DP_CNTL);

    wait_for_fifo(6, par);
    aty_st_le32(SRC_Y_X, (srcy << 16) | srcx);
    aty_st_le32(DP_MIX, ROP3_SRCCOPY | DP_SRC_RECT);
    aty_st_le32(DP_CNTL, DST_X_LEFT_TO_RIGHT | DST_Y_TOP_TO_BOTTOM);
    aty_st_le32(DP_DATATYPE, save_dp_datatype | dstval | SRC_DSTCOLOR);

    aty_st_le32(DST_Y_X, (dsty << 16) | dstx);
    aty_st_le32(DST_HEIGHT_WIDTH, (height << 16) | width);

    par->blitter_may_be_busy = 1;

    wait_for_fifo(2, par);
    aty_st_le32(DP_DATATYPE, save_dp_datatype);
    aty_st_le32(DP_CNTL, save_dp_cntl); 
}


    /*
     * Text mode accelerated functions
     */

static void fbcon_aty128_bmove(struct display *p, int sy, int sx, int dy, int dx,
                        int height, int width)
{
    sx     *= fontwidth(p);
    sy     *= fontheight(p);
    dx     *= fontwidth(p);
    dy     *= fontheight(p);
    width  *= fontwidth(p);
    height *= fontheight(p);

    aty128_rectcopy(sx, sy, dx, dy, width, height,
                        (struct fb_info_aty128 *)p->fb_info);
}
#endif /* 0 */

static void aty128_set_suspend(struct aty128fb_par *par, int suspend)
{
        u32     pmgt;
        struct pci_dev *pdev = par->pdev;

        if (!par->pm_reg)
                return;
                
        /* Set the chip into the appropriate suspend mode (we use D2,
         * D3 would require a complete re-initialisation of the chip,
         * including PCI config registers, clocks, AGP configuration, ...)
         *
         * For resume, the core will have already brought us back to D0
         */
        if (suspend) {
                /* Make sure CRTC2 is reset. Remove that the day we decide to
                 * actually use CRTC2 and replace it with real code for disabling
                 * the CRTC2 output during sleep
                 */
                aty_st_le32(CRTC2_GEN_CNTL, aty_ld_le32(CRTC2_GEN_CNTL) &
                        ~(CRTC2_EN));

                /* Set the power management mode to be PCI based */
                /* Use this magic value for now */
                pmgt = 0x0c005407;
                aty_st_pll(POWER_MANAGEMENT, pmgt);
                (void)aty_ld_pll(POWER_MANAGEMENT);
                aty_st_le32(BUS_CNTL1, 0x00000010);
                aty_st_le32(MEM_POWER_MISC, 0x0c830000);
                mdelay(100);

                /* Switch PCI power management to D2 */
                pci_set_power_state(pdev, PCI_D2);
        }
}

static int aty128_pci_suspend(struct pci_dev *pdev, pm_message_t state)
{
        struct fb_info *info = pci_get_drvdata(pdev);
        struct aty128fb_par *par = info->par;

        /* Because we may change PCI D state ourselves, we need to
         * first save the config space content so the core can
         * restore it properly on resume.
         */
        pci_save_state(pdev);

        /* We don't do anything but D2, for now we return 0, but
         * we may want to change that. How do we know if the BIOS
         * can properly take care of D3 ? Also, with swsusp, we
         * know we'll be rebooted, ...
         */
#ifndef CONFIG_PPC_PMAC
        /* HACK ALERT ! Once I find a proper way to say to each driver
         * individually what will happen with it's PCI slot, I'll change
         * that. On laptops, the AGP slot is just unclocked, so D2 is
         * expected, while on desktops, the card is powered off
         */
        return 0;
#endif /* CONFIG_PPC_PMAC */
         
        if (state.event == pdev->dev.power.power_state.event)
                return 0;

        printk(KERN_DEBUG "aty128fb: suspending...\n");
        
        console_lock();

        fb_set_suspend(info, 1);

        /* Make sure engine is reset */
        wait_for_idle(par);
        aty128_reset_engine(par);
        wait_for_idle(par);

        /* Blank display and LCD */
        aty128fb_blank(FB_BLANK_POWERDOWN, info);

        /* Sleep */
        par->asleep = 1;
        par->lock_blank = 1;

#ifdef CONFIG_PPC_PMAC
        /* On powermac, we have hooks to properly suspend/resume AGP now,
         * use them here. We'll ultimately need some generic support here,
         * but the generic code isn't quite ready for that yet
         */
        pmac_suspend_agp_for_card(pdev);
#endif /* CONFIG_PPC_PMAC */

        /* We need a way to make sure the fbdev layer will _not_ touch the
         * framebuffer before we put the chip to suspend state. On 2.4, I
         * used dummy fb ops, 2.5 need proper support for this at the
         * fbdev level
         */
        if (state.event != PM_EVENT_ON)
                aty128_set_suspend(par, 1);

        console_unlock();

        pdev->dev.power.power_state = state;

        return 0;
}

static int aty128_do_resume(struct pci_dev *pdev)
{
        struct fb_info *info = pci_get_drvdata(pdev);
        struct aty128fb_par *par = info->par;

        if (pdev->dev.power.power_state.event == PM_EVENT_ON)
                return 0;

        /* PCI state will have been restored by the core, so
         * we should be in D0 now with our config space fully
         * restored
         */

        /* Wakeup chip */
        aty128_set_suspend(par, 0);
        par->asleep = 0;

        /* Restore display & engine */
        aty128_reset_engine(par);
        wait_for_idle(par);
        aty128fb_set_par(info);
        fb_pan_display(info, &info->var);
        fb_set_cmap(&info->cmap, info);

        /* Refresh */
        fb_set_suspend(info, 0);

        /* Unblank */
        par->lock_blank = 0;
        aty128fb_blank(0, info);

#ifdef CONFIG_PPC_PMAC
        /* On powermac, we have hooks to properly suspend/resume AGP now,
         * use them here. We'll ultimately need some generic support here,
         * but the generic code isn't quite ready for that yet
         */
        pmac_resume_agp_for_card(pdev);
#endif /* CONFIG_PPC_PMAC */

        pdev->dev.power.power_state = PMSG_ON;

        printk(KERN_DEBUG "aty128fb: resumed !\n");

        return 0;
}

static int aty128_pci_resume(struct pci_dev *pdev)
{
        int rc;

        console_lock();
        rc = aty128_do_resume(pdev);
        console_unlock();

        return rc;
}


static int __devinit aty128fb_init(void)
{
#ifndef MODULE
        char *option = NULL;

        if (fb_get_options("aty128fb", &option))
                return -ENODEV;
        aty128fb_setup(option);
#endif

        return pci_register_driver(&aty128fb_driver);
}

static void __exit aty128fb_exit(void)
{
        pci_unregister_driver(&aty128fb_driver);
}

module_init(aty128fb_init);

module_exit(aty128fb_exit);

MODULE_AUTHOR("(c)1999-2003 Brad Douglas <brad@neruo.com>");
MODULE_DESCRIPTION("FBDev driver for ATI Rage128 / Pro cards");
MODULE_LICENSE("GPL");
module_param(mode_option, charp, 0);
MODULE_PARM_DESC(mode_option, "Specify resolution as \"<xres>x<yres>[-<bpp>][@<refresh>]\" ");
#ifdef CONFIG_MTRR
module_param_named(nomtrr, mtrr, invbool, 0);
MODULE_PARM_DESC(nomtrr, "bool: Disable MTRR support (0 or 1=disabled) (default=0)");
#endif