/* $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) 1999-2000, Brad Douglas <brad@neruo.com>
 *  Copyright (C) 1999, Anthony Tong <atong@uiuc.edu>
 *
 *                Ani Joshi / Jeff Garzik
 *                      - Code cleanup
 *
 *                Andreas Hundt <andi@convergence.de>
 *                      - FB_ACTIVATE fixes
 *
 *  Based off of Geert's atyfb.c and vfb.c.
 *
 *  TODO:
 *		- panning
 *		- monitor sensing (DDC)
 *              - virtual display
 *		- other platform support (only ppc/x86 supported)
 *		- hardware cursor support
 *		- ioctl()'s
 *
 *    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/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <asm/uaccess.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/selection.h>
#include <linux/console.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <asm/io.h>

#ifdef CONFIG_PPC
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <video/macmodes.h>
#ifdef CONFIG_NVRAM
#include <linux/nvram.h>
#endif
#endif

#ifdef CONFIG_ADB_PMU
#include <linux/adb.h>
#include <linux/pmu.h>
#endif

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

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

#include <video/fbcon.h>
#include <video/fbcon-cfb8.h>
#include <video/fbcon-cfb16.h>
#include <video/fbcon-cfb24.h>
#include <video/fbcon-cfb32.h>

#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, __FUNCTION__, ##args);
#else
#define DBG(fmt, args...)
#endif

#ifndef CONFIG_PPC
/* default mode */
static struct fb_var_screeninfo default_var __initdata = {
    /* 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 */
/* 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 */

/* default modedb mode */
/* 640x480, 60 Hz, Non-Interlaced (25.172 MHz dotclock) */
static struct fb_videomode defaultmode __initdata = {
	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
};

/* struct to hold chip description information */
struct aty128_chip_info {
    const char *name;
    unsigned short device;
    int chip_gen;
};

/* Chip generations */
enum {
	rage_128,
	rage_128_pro,
	rage_M3
};

/* supported Rage128 chipsets */
static struct aty128_chip_info aty128_pci_probe_list[] __initdata =
{
    {"Rage128 RE (PCI)", PCI_DEVICE_ID_ATI_RAGE128_RE, rage_128},
    {"Rage128 RF (AGP)", PCI_DEVICE_ID_ATI_RAGE128_RF, rage_128},
    {"Rage128 RK (PCI)", PCI_DEVICE_ID_ATI_RAGE128_RK, rage_128},
    {"Rage128 RL (AGP)", PCI_DEVICE_ID_ATI_RAGE128_RL, rage_128},
    {"Rage128 Pro PF (AGP)", PCI_DEVICE_ID_ATI_RAGE128_PF, rage_128_pro},
    {"Rage128 Pro PR (PCI)", PCI_DEVICE_ID_ATI_RAGE128_PR, rage_128_pro},
    {"Rage128 Pro TR (AGP)", PCI_DEVICE_ID_ATI_RAGE128_U3, rage_128_pro},	
    {"Rage Mobility M3 (PCI)", PCI_DEVICE_ID_ATI_RAGE128_LE, rage_M3},
    {"Rage Mobility M3 (AGP)", PCI_DEVICE_ID_ATI_RAGE128_LF, rage_M3},
    {NULL, 0, rage_128}
 };

/* 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 const char *aty128fb_name = "ATY Rage128";
static char fontname[40] __initdata = { 0 };

static int  noaccel __initdata = 0;
#ifdef MODULE
static char *font __initdata = NULL;
static char *mode __initdata = NULL;
#ifdef CONFIG_MTRR
static int  nomtrr __initdata = 0;
#endif
#endif /* MODULE */

static char *mode_option __initdata = NULL;

#ifdef CONFIG_PPC
static int default_vmode __initdata = VMODE_1024_768_60;
static int default_cmode __initdata = CMODE_8;
#endif

#ifdef CONFIG_MTRR
static int mtrr = 1;
#endif

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

struct aty128_crtc {
    u32 gen_cntl;
    u32 ext_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 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 fb_info_aty128 {
    struct fb_info fb_info;
    struct fb_info_aty128 *next;
    struct aty128_constants constants;  /* PLL and others      */
    unsigned long regbase_phys;         /* physical mmio       */
    void *regbase;                      /* remapped mmio       */
    unsigned long frame_buffer_phys;    /* physical fb memory  */
    void *frame_buffer;                 /* remaped framebuffer */
    u32 vram_size;                      /* onboard video ram   */
    int chip_gen;
    const struct aty128_meminfo *mem;   /* onboard mem info    */
    struct aty128fb_par default_par, current_par;
    struct display disp;
    struct { u8 red, green, blue, pad; } palette[256];
    union {
#ifdef FBCON_HAS_CFB16
    u16 cfb16[16];
#endif
#ifdef FBCON_HAS_CFB24
    u32 cfb24[16];
#endif
#ifdef FBCON_HAS_CFB32
    u32 cfb32[16];
#endif
    } fbcon_cmap;
#ifdef CONFIG_PCI
    struct pci_dev *pdev;
#endif
#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) */
};

static struct fb_info_aty128 *board_list = NULL;

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

    /*
     *  Interface used by the world
     */

int aty128fb_setup(char *options);

static int aty128fb_get_fix(struct fb_fix_screeninfo *fix, int con,
		       struct fb_info *info);
static int aty128fb_get_var(struct fb_var_screeninfo *var, int con,
		       struct fb_info *info);
static int aty128fb_set_var(struct fb_var_screeninfo *var, int con,
		       struct fb_info *info);
static int aty128fb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
			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, int con,
			   struct fb_info *fb);
static int aty128fb_blank(int blank, struct fb_info *fb);
static int aty128fb_rasterimg(struct fb_info *info, int start);

    /*
     *  Interface to the low level console driver
     */

int aty128fb_init(void);
static int aty128fbcon_switch(int con, struct fb_info *fb);

    /*
     *  Internal routines
     */

static void aty128_encode_fix(struct fb_fix_screeninfo *fix,
				struct aty128fb_par *par,
				const struct fb_info_aty128 *info);
static void aty128_set_dispsw(struct display *disp,
			struct fb_info_aty128 *info, int bpp, int accel);
static int aty128_getcolreg(u_int regno, u_int *red, u_int *green, u_int *blue,
				u_int *transp, struct fb_info *info);
static int aty128_encode_var(struct fb_var_screeninfo *var,
                             const struct aty128fb_par *par,
                             const struct fb_info_aty128 *info);
static int aty128_decode_var(struct fb_var_screeninfo *var,
                             struct aty128fb_par *par,
                             const struct fb_info_aty128 *info);
static int aty128_pci_register(struct pci_dev *pdev,
                               const struct aty128_chip_info *aci);
static struct fb_info_aty128 *aty128_board_list_add(struct fb_info_aty128
				*board_list, struct fb_info_aty128 *new_node);
#if !defined(CONFIG_PPC) && !defined(__sparc__)
static void __init aty128_get_pllinfo(struct fb_info_aty128 *info,
			char *bios_seg);
static char __init *aty128find_ROM(struct fb_info_aty128 *info);
#endif
static void aty128_timings(struct fb_info_aty128 *info);
static void aty128_init_engine(const struct aty128fb_par *par, 
				struct fb_info_aty128 *info);
static void aty128_reset_engine(const struct fb_info_aty128 *info);
static void aty128_flush_pixel_cache(const struct fb_info_aty128 *info);
static void do_wait_for_fifo(u16 entries, struct fb_info_aty128 *info);
static void wait_for_fifo(u16 entries, struct fb_info_aty128 *info);
static void wait_for_idle(struct fb_info_aty128 *info);
static u32 bpp_to_depth(u32 bpp);

#ifdef FBCON_HAS_CFB8
static struct display_switch fbcon_aty128_8;
static void fbcon_aty8_putc(struct vc_data *conp, struct display *p,
                            int c, int yy, int xx);
static void fbcon_aty8_putcs(struct vc_data *conp, struct display *p,
                             const unsigned short *s, int count,
                             int yy, int xx);
#endif
#ifdef FBCON_HAS_CFB16
static struct display_switch fbcon_aty128_16;
static void fbcon_aty16_putc(struct vc_data *conp, struct display *p,
                            int c, int yy, int xx);
static void fbcon_aty16_putcs(struct vc_data *conp, struct display *p,
                             const unsigned short *s, int count,
                             int yy, int xx);
#endif
#ifdef FBCON_HAS_CFB24
static struct display_switch fbcon_aty128_24;
static void fbcon_aty24_putc(struct vc_data *conp, struct display *p,
                            int c, int yy, int xx);
static void fbcon_aty24_putcs(struct vc_data *conp, struct display *p,
                             const unsigned short *s, int count,
                             int yy, int xx);
#endif
#ifdef FBCON_HAS_CFB32
static struct display_switch fbcon_aty128_32;
static void fbcon_aty32_putc(struct vc_data *conp, struct display *p,
                            int c, int yy, int xx);
static void fbcon_aty32_putcs(struct vc_data *conp, struct display *p,
                             const unsigned short *s, int count,
                             int yy, int xx);
#endif

static struct fb_ops aty128fb_ops = {
	owner:		THIS_MODULE,
	fb_get_fix:	aty128fb_get_fix,
	fb_get_var:	aty128fb_get_var,
	fb_set_var:	aty128fb_set_var,
	fb_get_cmap:	aty128fb_get_cmap,
	fb_set_cmap:	gen_set_cmap,
	fb_setcolreg:	aty128fb_setcolreg,
	fb_pan_display:	aty128fb_pan_display,
	fb_blank:	aty128fb_blank,
	fb_rasterimg:	aty128fb_rasterimg,
};

#ifdef CONFIG_PMAC_BACKLIGHT
static int aty128_set_backlight_enable(int on, int level, void* data);
static int aty128_set_backlight_level(int level, void* data);

static struct backlight_controller aty128_backlight_controller = {
	aty128_set_backlight_enable,
	aty128_set_backlight_level
};
#endif /* CONFIG_PMAC_BACKLIGHT */

    /*
     * 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 fb_info_aty128 *info)
{
    u32 val;

#if defined(__powerpc__)
    asm("lwbrx %0,%1,%2;eieio" : "=r"(val) : "b"(regindex), "r"(info->regbase));
#else
    val = readl (info->regbase + regindex);
#endif

    return val;
}

static inline void
_aty_st_le32(volatile unsigned int regindex, u32 val, 
                               const struct fb_info_aty128 *info)
{
#if defined(__powerpc__)
    asm("stwbrx %0,%1,%2;eieio" : : "r"(val), "b"(regindex),
                "r"(info->regbase) : "memory");
#else
    writel (val, info->regbase + regindex);
#endif
}

static inline u8
_aty_ld_8(unsigned int regindex, const struct fb_info_aty128 *info)
{
    return readb (info->regbase + regindex);
}

static inline void
_aty_st_8(unsigned int regindex, u8 val, const struct fb_info_aty128 *info)
{
    writeb (val, info->regbase + regindex);
}

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

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

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


static u32
_aty_ld_pll(unsigned int pll_index,
			const struct fb_info_aty128 *info)
{       
    aty_st_8(CLOCK_CNTL_INDEX, pll_index & 0x1F);
    return aty_ld_le32(CLOCK_CNTL_DATA);
}

    
static void
_aty_st_pll(unsigned int pll_index, u32 val,
			const struct fb_info_aty128 *info)
{
    aty_st_8(CLOCK_CNTL_INDEX, (pll_index & 0x1F) | 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 fb_info_aty128 *info)
{
    return !(aty_ld_pll(PPLL_REF_DIV) & PPLL_ATOMIC_UPDATE_R);
}


static void
aty_pll_wait_readupdate(const struct fb_info_aty128 *info)
{
    unsigned long timeout = jiffies + HZ/100;	// should be more than enough
    int reset = 1;

    while (time_before(jiffies, timeout))
	if (aty_pll_readupdate(info)) {
	    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 fb_info_aty128 *info)
{
    aty_pll_wait_readupdate(info);

    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 __init
register_test(const struct fb_info_aty128 *info)
{
    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 fb_info_aty128 *info)
{
    int i;

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


static void
wait_for_idle(struct fb_info_aty128 *info)
{
    int i;

    do_wait_for_fifo(64, info);

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


static void
wait_for_fifo(u16 entries, struct fb_info_aty128 *info)
{
    if (info->fifo_slots < entries)
        do_wait_for_fifo(64, info);
    info->fifo_slots -= entries;
}


static void
aty128_flush_pixel_cache(const struct fb_info_aty128 *info)
{
    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 fb_info_aty128 *info)
{
    u32 gen_reset_cntl, clock_cntl_index, mclk_cntl;

    aty128_flush_pixel_cache(info);

    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(const struct aty128fb_par *par,
		struct fb_info_aty128 *info)
{
    u32 pitch_value;

    wait_for_idle(info);

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

    aty128_reset_engine(info);

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

    wait_for_fifo(4, info);
    /* 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			|
		(bpp_to_depth(par->crtc.bpp) << 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, info);
    /* 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(info);
}


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

    return -EINVAL;
}


    /*
     * CRTC programming
     */

/* Program the CRTC registers */
static void
aty128_set_crtc(const struct aty128_crtc *crtc,
		const struct fb_info_aty128 *info)
{
    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?
     * -- BenH: Breaks on my G4
     */
#if 0
    aty_st_le32(PPLL_CNTL, aty_ld_le32(PPLL_CNTL) & ~(0x00030000));
#endif
}


static int
aty128_var_to_crtc(const struct fb_var_screeninfo *var,
			struct aty128_crtc *crtc,
			const struct fb_info_aty128 *info)
{
    u32 xres, yres, vxres, vyres, xoffset, yoffset, bpp;
    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 hsync_strt_pix[5] = { 0, 0x12, 9, 6, 5 };
    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;

    /* 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 bpp into ATI register depth */
    depth = bpp_to_depth(bpp);

    /* make sure we didn't get an invalid depth */
    if (depth == -EINVAL) {
        printk(KERN_ERR "aty128fb: Invalid depth\n");
        return -EINVAL;
    }

    /* convert depth to bpp */
    bytpp = mode_bytpp[depth];

    /* make sure there is enough video ram for the mode */
    if ((u32)(vxres * vyres * bytpp) > info->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 + (right >> 3);

    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 | (depth << 8);

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

    crtc->h_sync_strt_wid = hsync_strt_pix[bytpp] | (h_sync_strt << 3) |
                (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->bpp = bpp;

    return 0;
}


static int
aty128_bpp_to_var(int pix_width, struct fb_var_screeninfo *var)
{

    /* fill in pixel info */
    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.offset = 0;
	var->blue.length = 8;
	var->transp.offset = 0;
	var->transp.length = 0;
	break;
    case CRTC_PIX_WIDTH_15BPP:
    case CRTC_PIX_WIDTH_16BPP:
	var->bits_per_pixel = 16;
	var->red.offset = 10;
	var->red.length = 5;
	var->green.offset = 5;
	var->green.length = 5;
	var->blue.offset = 0;
	var->blue.length = 5;
	var->transp.offset = 0;
	var->transp.length = 0;
	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.offset = 0;
        var->blue.length = 8;
        var->transp.offset = 0;
        var->transp.length = 0;
        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.offset = 0;
	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_bpp_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_pll(struct aty128_pll *pll, const struct fb_info_aty128 *info)
{
    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(info);
    aty_st_pll(PPLL_REF_DIV, info->constants.ref_divider & 0x3ff);
    aty_pll_writeupdate(info);

    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(info);
    aty_st_pll(PPLL_DIV_3, div3);
    aty_pll_writeupdate(info);

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

    /* 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 fb_info_aty128 *info)
{
    const struct aty128_constants c = info->constants;
    unsigned char post_dividers[] = {1,2,4,8,3,6,12};
    u32 output_freq;
    u32 vclk;        /* in .01 MHz */
    int i;
    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 < sizeof(post_dividers); i++) {
	output_freq = post_dividers[i] * vclk;
	if (output_freq >= c.ppll_min && output_freq <= c.ppll_max)
	    break;
    }

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

    pll->post_divider = post_dividers[i];
    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,
		const struct fb_info_aty128 *info)
{
    var->pixclock = 100000000 / pll->vclk;

    return 0;
}


static void
aty128_set_fifo(const struct aty128_ddafifo *dsp,
			const struct fb_info_aty128 *info)
{
    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 bpp,
		const struct fb_info_aty128 *info)
{
    const struct aty128_meminfo *m = info->mem;
    u32 xclk = info->constants.xclk;
    u32 fifo_width = info->constants.fifo_width;
    u32 fifo_depth = info->constants.fifo_depth;
    s32 x, b, p, ron, roff;
    u32 n, d;

    /* 15bpp is really 16bpp */
    if (bpp == 15)
	bpp = 16;

    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 void
aty128_set_par(struct aty128fb_par *par,
			struct fb_info_aty128 *info)
{ 
    u32 config;

    info->current_par = *par;
    
    if (info->blitter_may_be_busy)
        wait_for_idle(info);

    /* 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, info);
    aty128_set_pll(&par->pll, info);
    aty128_set_fifo(&par->fifo_reg, info);

    config = aty_ld_le32(CONFIG_CNTL) & ~3;

#if defined(__BIG_ENDIAN)
    if (par->crtc.bpp >= 24)
	config |= 2;	/* make aperture do 32 byte swapping */
    else if (par->crtc.bpp > 8)
	config |= 1;	/* make aperture do 16 byte swapping */
#endif

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

    if (par->accel_flags & FB_ACCELF_TEXT)
        aty128_init_engine(par, info);

#if defined(CONFIG_BOOTX_TEXT)
	btext_update_display(info->frame_buffer_phys,
			(((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 */
}

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

static int
aty128_decode_var(struct fb_var_screeninfo *var, struct aty128fb_par *par,
			const struct fb_info_aty128 *info)
{
    int err;

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

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

    if ((err = aty128_ddafifo(&par->fifo_reg, &par->pll, par->crtc.bpp, info)))
	return err;

    if (var->accel_flags & FB_ACCELF_TEXT)
	par->accel_flags = FB_ACCELF_TEXT;
    else
	par->accel_flags = 0;

    return 0;
}


static int
aty128_encode_var(struct fb_var_screeninfo *var,
			const struct aty128fb_par *par,
			const struct fb_info_aty128 *info)
{
    int err;

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

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

    var->red.msb_right = 0;
    var->green.msb_right = 0;
    var->blue.msb_right = 0;
    var->transp.msb_right = 0;

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

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

    return 0;
}           


    /*
     *  Get the User Defined Part of the Display
     */

static int
aty128fb_get_var(struct fb_var_screeninfo *var, int con, struct fb_info *fb)
{
    const struct fb_info_aty128 *info = (struct fb_info_aty128 *)fb;

    if (con == -1)
	aty128_encode_var(var, &info->default_par, info); 
    else
	*var = fb_display[con].var;
    return 0;
}


    /*
     *  Set the User Defined Part of the Display
     */

static int
aty128fb_set_var(struct fb_var_screeninfo *var, int con, struct fb_info *fb)
{
    struct fb_info_aty128 *info = (struct fb_info_aty128 *)fb;
    struct aty128fb_par par;
    struct display *display;
    int oldxres, oldyres, oldvxres, oldvyres, oldbpp, oldaccel;
    int accel, err;

    display = (con >= 0) ? &fb_display[con] : fb->disp;

    /* basic (in)sanity checks */
    if (!var->xres)
        var->xres = 1;
    if (!var->yres)
        var->yres = 1;
    if (var->xres > var->xres_virtual)
        var->xres_virtual = var->xres;
    if (var->yres > var->yres_virtual)
        var->yres_virtual = var->yres;

    switch (var->bits_per_pixel) {
        case 0 ... 8:
            var->bits_per_pixel = 8;
            break;
        case 9 ... 16:
            var->bits_per_pixel = 16;
            break;
        case 17 ... 24:
            var->bits_per_pixel = 24;
            break;
        case 25 ... 32:
            var->bits_per_pixel = 32;
            break;
        default:
            return -EINVAL;
    }

    if ((err = aty128_decode_var(var, &par, info)))
	return err;

    aty128_encode_var(var, &par, info);

    if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_TEST)
	return 0;

    oldxres = display->var.xres;
    oldyres = display->var.yres;
    oldvxres = display->var.xres_virtual;
    oldvyres = display->var.yres_virtual;
    oldbpp = display->var.bits_per_pixel;
    oldaccel = display->var.accel_flags;
    display->var = *var;
    if (oldxres != var->xres || oldyres != var->yres ||
	oldvxres != var->xres_virtual || oldvyres != var->yres_virtual ||
	oldbpp != var->bits_per_pixel || oldaccel != var->accel_flags) {

	struct fb_fix_screeninfo fix;

	aty128_encode_fix(&fix, &par, info);
        fb->screen_base = info->frame_buffer;
	display->visual = fix.visual;
	display->type = fix.type;
	display->type_aux = fix.type_aux;
	display->ypanstep = fix.ypanstep;
	display->ywrapstep = fix.ywrapstep;
	display->line_length = fix.line_length;
	display->can_soft_blank = 1;
	display->inverse = 0;

	accel = var->accel_flags & FB_ACCELF_TEXT;
        aty128_set_dispsw(display, info, par.crtc.bpp, accel);

	if (accel)
	    display->scrollmode = SCROLL_YNOMOVE;
	else
	    display->scrollmode = SCROLL_YREDRAW;

	if (info->fb_info.changevar)
	    (*info->fb_info.changevar)(con);
    }

    if (!info->fb_info.display_fg || info->fb_info.display_fg->vc_num == con)
	aty128_set_par(&par, info);

    if (oldbpp != var->bits_per_pixel) {
	if ((err = fb_alloc_cmap(&display->cmap, 0, 0)))
	    return err;
	do_install_cmap(con, &info->fb_info);
    } 

    return 0;
}


static void
aty128_set_dispsw(struct display *disp,
			struct fb_info_aty128 *info, int bpp, int accel)
{
    switch (bpp) {
#ifdef FBCON_HAS_CFB8
    case 8:
	disp->dispsw = accel ? &fbcon_aty128_8 : &fbcon_cfb8;
	break;
#endif
#ifdef FBCON_HAS_CFB16
    case 15:
    case 16:
	disp->dispsw = accel ? &fbcon_aty128_16 : &fbcon_cfb16;
	disp->dispsw_data = info->fbcon_cmap.cfb16;
	break;
#endif
#ifdef FBCON_HAS_CFB24
    case 24:
	disp->dispsw = accel ? &fbcon_aty128_24 : &fbcon_cfb24;
	disp->dispsw_data = info->fbcon_cmap.cfb24;
	break;
#endif
#ifdef FBCON_HAS_CFB32
    case 32:
	disp->dispsw = accel ? &fbcon_aty128_32 : &fbcon_cfb32;
	disp->dispsw_data = info->fbcon_cmap.cfb32;
	break;
#endif
    default:
	disp->dispsw = &fbcon_dummy;
    }
}


static void
aty128_encode_fix(struct fb_fix_screeninfo *fix,
			struct aty128fb_par *par,
			const struct fb_info_aty128 *info)
{
    memset(fix, 0, sizeof(struct fb_fix_screeninfo));
    
    strcpy(fix->id, aty128fb_name);

    fix->smem_start = (unsigned long)info->frame_buffer_phys;
    fix->mmio_start = (unsigned long)info->regbase_phys;

    fix->smem_len = info->vram_size;
    fix->mmio_len = 0x1fff;

    fix->type        = FB_TYPE_PACKED_PIXELS;
    fix->type_aux    = 0;
    fix->line_length = (par->crtc.vxres * par->crtc.bpp) >> 3;
    fix->visual      = par->crtc.bpp <= 8 ? FB_VISUAL_PSEUDOCOLOR
                                          : FB_VISUAL_DIRECTCOLOR;
    fix->ywrapstep = 0;
    fix->xpanstep  = 8;
    fix->ypanstep  = 1;

    fix->accel = FB_ACCEL_ATI_RAGE128;

    return;
}


    /*
     *  Get the Fixed Part of the Display
     */
static int
aty128fb_get_fix(struct fb_fix_screeninfo *fix, int con, struct fb_info *fb)
{
    const struct fb_info_aty128 *info = (struct fb_info_aty128 *)fb;
    struct aty128fb_par par;

    if (con == -1)
	par = info->default_par;
    else
	aty128_decode_var(&fb_display[con].var, &par, info); 

    aty128_encode_fix(fix, &par, info);

    return 0;            
}


    /*
     *  Pan or Wrap the Display
     *
     *  Not supported (yet!)
     */
static int
aty128fb_pan_display(struct fb_var_screeninfo *var, int con,
			   struct fb_info *fb)
{
    struct fb_info_aty128 *info = (struct fb_info_aty128 *)fb;
    struct aty128fb_par *par = &info->current_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) >> 6;

    aty_st_le32(CRTC_OFFSET, offset);

    return 0;
}


    /*
     *  Get the Colormap
     */

static int
aty128fb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
			struct fb_info *info)
{
#if 1
    fb_copy_cmap(&info->cmap, cmap, kspc ? 0 : 2);
#else
    struct fb_info_aty128 fb = (struct fb_info_aty128 *)info;

    if (con == info->currcon) /* current console? */
	return fb_get_cmap(cmap, kspc, aty128_getcolreg, info);
    else if (fb_display[con].cmap.len) /* non default colormap? */
	fb_copy_cmap(&fb_display[con].cmap, cmap, kspc ? 0 : 2);
    else {  
	int size = (fb_display[con].var.bits_per_pixel <= 8) ? 256 : 32;
	fb_copy_cmap(fb_default_cmap(size), cmap, kspc ? 0 : 2);
    }
#endif

    return 0;
}

static int
aty128fb_rasterimg(struct fb_info *info, int start)
{
    struct fb_info_aty128 *fb = (struct fb_info_aty128 *)info;

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

    return 0;
}


int __init
aty128fb_setup(char *options)
{
    char *this_opt;

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

    while ((this_opt = strsep(&options, ",")) != NULL) {
	if (!strncmp(this_opt, "font:", 5)) {
	    char *p;
	    int i;
	    
	    p = this_opt +5;
	    for (i = 0; i < sizeof(fontname) - 1; i++)
		if (!*p || *p == ' ' || *p == ',')
		    break;
	    memcpy(fontname, this_opt + 5, i);
	    fontname[i] = 0;
	} else if (!strncmp(this_opt, "noaccel", 7)) {
	    noaccel = 1;
        }
#ifdef CONFIG_MTRR
        else if(!strncmp(this_opt, "nomtrr", 6)) {
            mtrr = 0;
        }
#endif
#ifdef CONFIG_PPC
        /* vmode and cmode depreciated */
	else 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;
        } 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;
            }
        }
#endif /* CONFIG_PPC */
        else
            mode_option = this_opt;
    }
    return 0;
}


    /*
     *  Initialisation
     */

static int __init
aty128_init(struct fb_info_aty128 *info, const char *name)
{
    struct fb_var_screeninfo var;
    u32 dac;
    int j, k, size;
    u8 chip_rev;
    const struct aty128_chip_info *aci = &aty128_pci_probe_list[0];
    char *video_card = "Rage128";

    if (!info->vram_size)	/* may have already been probed */
	info->vram_size = aty_ld_le32(CONFIG_MEMSIZE) & 0x03FFFFFF;

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

    /* put a name with the face */
    while (aci->name && info->pdev->device != aci->device) { aci++; }
    video_card = (char *)aci->name;
    info->chip_gen = aci->chip_gen;

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

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

    /* fill in info */
    strcpy(info->fb_info.modename, aty128fb_name);
    info->fb_info.node  = NODEV;
    info->fb_info.fbops = &aty128fb_ops;
    info->fb_info.disp  = &info->disp;
    strcpy(info->fb_info.fontname, fontname);
    info->fb_info.changevar  = NULL;
    info->fb_info.switch_con = &aty128fbcon_switch;
    info->fb_info.updatevar  = NULL;
    info->fb_info.flags = FBINFO_FLAG_DEFAULT;

    var = default_var;
#ifdef CONFIG_PPC
    if (_machine == _MACH_Pmac) {
        if (mode_option) {
            if (!mac_find_mode(&var, &info->fb_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 (machine_is_compatible("PowerMac2,1") ||
		machine_is_compatible("PowerMac2,2") ||
		machine_is_compatible("PowerMac4,1"))
		default_vmode = VMODE_1024_768_75;

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

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

	    /* PowerBook Titanium */
	    if (machine_is_compatible("PowerBook3,2"))
		default_vmode = VMODE_1152_768_60;
	
            if (default_cmode < CMODE_8 || default_cmode > CMODE_32)
                default_cmode = CMODE_8;

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

    if (noaccel)
        var.accel_flags &= ~FB_ACCELF_TEXT;
    else
        var.accel_flags |= FB_ACCELF_TEXT;

    if (aty128_decode_var(&var, &info->default_par, info)) {
	printk(KERN_ERR "aty128fb: Cannot set default mode.\n");
	return 0;
    }

    /* load up the palette with default colors */
    for (j = 0; j < 16; j++) {
        k = color_table[j];
        info->palette[j].red = default_red[k];
        info->palette[j].green = default_grn[k];
        info->palette[j].blue = default_blu[k];
    }

    /* setup the DAC the way we like it */
    dac = aty_ld_le32(DAC_CNTL);
    dac |= (DAC_8BIT_EN | DAC_RANGE_CNTL);
    dac |= DAC_MASK;
    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);

    aty128fb_set_var(&var, -1, &info->fb_info);
    aty128_init_engine(&info->default_par, info);

    board_list = aty128_board_list_add(board_list, info);

    size = (var.bits_per_pixel <= 8) ? 256 : 32;
    fb_alloc_cmap(info->fb_info.cmap, size, 0);	

    if (register_framebuffer(&info->fb_info) < 0)
	return 0;

#ifdef CONFIG_PMAC_BACKLIGHT
    /* Could be extended to Rage128Pro LVDS output too */
    if (info->chip_gen == rage_M3)
    	register_backlight_controller(&aty128_backlight_controller, info, "ati");
#endif /* CONFIG_PMAC_BACKLIGHT */

    printk(KERN_INFO "fb%d: %s frame buffer device on %s\n",
	   GET_FB_IDX(info->fb_info.node), aty128fb_name, name);

    return 1;	/* success! */
}


/* add a new card to the list  ++ajoshi */
static struct
fb_info_aty128 *aty128_board_list_add(struct fb_info_aty128 *board_list,
                                       struct fb_info_aty128 *new_node)
{
    struct fb_info_aty128 *i_p = board_list;

    new_node->next = NULL;
    if(board_list == NULL)
	return new_node;
    while(i_p->next != NULL)
	i_p = i_p->next;
    i_p->next = new_node;

    return board_list;
}


int __init
aty128fb_init(void)
{
#ifdef CONFIG_PCI
    struct pci_dev *pdev = NULL;
    const struct aty128_chip_info *aci = &aty128_pci_probe_list[0];

    while (aci->name != NULL) {
        pdev = pci_find_device(PCI_VENDOR_ID_ATI, aci->device, pdev);
        while (pdev != NULL) {
            if (aty128_pci_register(pdev, aci) == 0)
                return 0;
            pdev = pci_find_device(PCI_VENDOR_ID_ATI, aci->device, pdev);
        }
	aci++;
    }
#endif

    return 0;
}


#ifdef CONFIG_PCI
/* register a card    ++ajoshi */
static int __init
aty128_pci_register(struct pci_dev *pdev,
                               const struct aty128_chip_info *aci)
{
	struct fb_info_aty128 *info = NULL;
	unsigned long fb_addr, reg_addr;
	int err;
#if !defined(CONFIG_PPC) && !defined(__sparc__)
	char *bios_seg = NULL;
#endif

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

	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");
		goto err_free_fb;
	}

	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_mmio;
	}

	/* We have the resources. Now virtualize them */
	if (!(info = kmalloc(sizeof(struct fb_info_aty128), GFP_ATOMIC))) {
		printk(KERN_ERR "aty128fb: can't alloc fb_info_aty128\n");
		goto err_unmap_out;
	}
	memset(info, 0, sizeof(struct fb_info_aty128));

	/* Copy PCI device info into info->pdev */
	info->pdev = pdev;

	info->fb_info.currcon = -1;

	/* Virtualize mmio region */
	info->regbase_phys = reg_addr;
	info->regbase = ioremap(reg_addr, 0x1FFF);

	if (!info->regbase)
		goto err_free_info;

	/* Grab memory size from the card */
	info->vram_size = aty_ld_le32(CONFIG_MEMSIZE) & 0x03FFFFFF;

	/* Virtualize the framebuffer */
	info->frame_buffer_phys = fb_addr;
	info->frame_buffer = ioremap(fb_addr, info->vram_size);

	if (!info->frame_buffer) {
		iounmap((void *)info->regbase);
		goto err_free_info;
	}

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

#if !defined(CONFIG_PPC) && !defined(__sparc__)
	if (!(bios_seg = aty128find_ROM(info)))
		printk(KERN_INFO "aty128fb: Rage128 BIOS not located. "
					"Guessing...\n");
	else {
		printk(KERN_INFO "aty128fb: Rage128 BIOS located at "
				"segment %4.4X\n", (unsigned int)bios_seg);
		aty128_get_pllinfo(info, bios_seg);
	}
#endif
	aty128_timings(info);

	if (!aty128_init(info, "PCI"))
		goto err_out;

#ifdef CONFIG_MTRR
	if (mtrr) {
		info->mtrr.vram = mtrr_add(info->frame_buffer_phys,
				info->vram_size, MTRR_TYPE_WRCOMB, 1);
		info->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->frame_buffer);
	iounmap(info->regbase);
err_free_info:
	kfree(info);
err_unmap_out:
	release_mem_region(pci_resource_start(pdev, 2),
			pci_resource_len(pdev, 2));
err_free_mmio:
	release_mem_region(pci_resource_start(pdev, 0),
			pci_resource_len(pdev, 0));
err_free_fb:
	release_mem_region(pci_resource_start(pdev, 1),
			pci_resource_len(pdev, 1));
	return -ENODEV;
}
#endif /* CONFIG_PCI */


/* PPC and Sparc cannot read video ROM */
#if !defined(CONFIG_PPC) && !defined(__sparc__)
static char __init
*aty128find_ROM(struct fb_info_aty128 *info)
{
	u32  segstart;
	char *rom_base;
	char *rom;
	int  stage;
	int  i;
	char aty_rom_sig[] = "761295520";   /* ATI ROM Signature      */
	char R128_sig[] = "R128";           /* Rage128 ROM identifier */

	for (segstart=0x000c0000; segstart<0x000f0000; segstart+=0x00001000) {
        	stage = 1;

		rom_base = (char *)ioremap(segstart, 0x1000);

		if ((*rom_base == 0x55) && (((*(rom_base + 1)) & 0xff) == 0xaa))
			stage = 2;

		if (stage != 2) {
			iounmap(rom_base);
			continue;
		}
		rom = rom_base;

		for (i = 0; (i < 128 - strlen(aty_rom_sig)) && (stage != 3); i++) {
			if (aty_rom_sig[0] == *rom)
				if (strncmp(aty_rom_sig, rom,
						strlen(aty_rom_sig)) == 0)
					stage = 3;
			rom++;
		}
		if (stage != 3) {
			iounmap(rom_base);
			continue;
		}
		rom = rom_base;

		/* ATI signature found.  Let's see if it's a Rage128 */
		for (i = 0; (i < 512) && (stage != 4); i++) {
			if (R128_sig[0] == *rom)
				if (strncmp(R128_sig, rom, 
						strlen(R128_sig)) == 0)
					stage = 4;
			rom++;
		}
		if (stage != 4) {
			iounmap(rom_base);
			continue;
		}

		return rom_base;
	}

	return NULL;
}


static void __init
aty128_get_pllinfo(struct fb_info_aty128 *info, char *bios_seg)
{
	void *bios_header;
	void *header_ptr;
	u16 bios_header_offset, pll_info_offset;
	PLL_BLOCK pll;

	bios_header = bios_seg + 0x48L;
	header_ptr  = bios_header;

	bios_header_offset = readw(header_ptr);
	bios_header = bios_seg + bios_header_offset;
	bios_header += 0x30;

	header_ptr = bios_header;
	pll_info_offset = readw(header_ptr);
	header_ptr = bios_seg + pll_info_offset;

	memcpy_fromio(&pll, header_ptr, 50);

	info->constants.ppll_max = pll.PCLK_max_freq;
	info->constants.ppll_min = pll.PCLK_min_freq;
	info->constants.xclk = (u32)pll.XCLK;
	info->constants.ref_divider = (u32)pll.PCLK_ref_divider;
	info->constants.dotclock = (u32)pll.PCLK_ref_freq;

	DBG("ppll_max %d ppll_min %d xclk %d ref_divider %d dotclock %d\n",
			info->constants.ppll_max, info->constants.ppll_min,
			info->constants.xclk, info->constants.ref_divider,
			info->constants.dotclock);

}           
#endif /* !CONFIG_PPC */


/* fill in known card constants if pll_block is not available */
static void __init
aty128_timings(struct fb_info_aty128 *info)
{
#ifdef CONFIG_PPC
    /* 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 (!info->constants.dotclock)
        info->constants.dotclock = 2950;

#ifdef CONFIG_PPC
    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;

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

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

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

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

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

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

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


static int
aty128fbcon_switch(int con, struct fb_info *fb)
{
    struct fb_info_aty128 *info = (struct fb_info_aty128 *)fb;
    struct aty128fb_par par;

    /* Do we have to save the colormap? */
    if (fb_display[fb->currcon].cmap.len)
    	fb_get_cmap(&fb_display[fb->currcon].cmap, 1,
			aty128_getcolreg, fb);

    /* set the current console */
    fb->currcon = con;

    aty128_decode_var(&fb_display[con].var, &par, info);
    aty128_set_par(&par, info);

    aty128_set_dispsw(&fb_display[con], info, par.crtc.bpp,
        par.accel_flags & FB_ACCELF_TEXT);

    do_install_cmap(con, fb);

    return 1;
}


    /*
     *  Blank the display.
     */
static int 
aty128fb_blank(int blank, struct fb_info *fb)
{
    struct fb_info_aty128 *info = (struct fb_info_aty128 *)fb;
    u8 state = 0;

#ifdef CONFIG_PMAC_BACKLIGHT
    if ((_machine == _MACH_Pmac) && blank)
    	set_backlight_enable(0);
#endif /* CONFIG_PMAC_BACKLIGHT */

    if (blank & VESA_VSYNC_SUSPEND)
	state |= 2;
    if (blank & VESA_HSYNC_SUSPEND)
	state |= 1;
    if (blank & VESA_POWERDOWN)
	state |= 4;

    aty_st_8(CRTC_EXT_CNTL+1, state);

#ifdef CONFIG_PMAC_BACKLIGHT
    if ((_machine == _MACH_Pmac) && !blank)
    	set_backlight_enable(1);
#endif /* CONFIG_PMAC_BACKLIGHT */
    return 0;	
}

    /*
     *  Read a single color register and split it into
     *  colors/transparent. Return != 0 for invalid regno.
     */
static int
aty128_getcolreg(u_int regno, u_int *red, u_int *green, u_int *blue,
                         u_int *transp, struct fb_info *fb)
{
    struct fb_info_aty128 *info = (struct fb_info_aty128 *) fb;

    if (regno > 255)
	return 1;

    *red = (info->palette[regno].red<<8) | info->palette[regno].red;
    *green = (info->palette[regno].green<<8) | info->palette[regno].green;
    *blue = (info->palette[regno].blue<<8) | info->palette[regno].blue;
    *transp = 0;

    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 *fb)
{
    struct fb_info_aty128 *info = (struct fb_info_aty128 *)fb;
    u32 col;

    if (regno > 255)
	return 1;

    red >>= 8;
    green >>= 8;
    blue >>= 8;
    info->palette[regno].red = red;
    info->palette[regno].green = green;
    info->palette[regno].blue = blue;

    /* Note: For now, on M3, we set palette on both heads, which may
     * be useless. Can someone with a M3 check this ? */

    /* initialize gamma ramp for hi-color+ */

    if ((info->current_par.crtc.bpp > 8) && (regno == 0)) {
        int i;

        if (info->chip_gen == rage_M3)
            aty_st_le32(DAC_CNTL, aty_ld_le32(DAC_CNTL) & ~DAC_PALETTE_ACCESS_CNTL);

        for (i=16; i<256; i++) {
            aty_st_8(PALETTE_INDEX, i);
            col = (i << 16) | (i << 8) | i;
            aty_st_le32(PALETTE_DATA, col);
        }

        if (info->chip_gen == rage_M3) {
            aty_st_le32(DAC_CNTL, aty_ld_le32(DAC_CNTL) | DAC_PALETTE_ACCESS_CNTL);

            for (i=16; i<256; i++) {
                aty_st_8(PALETTE_INDEX, i);
                col = (i << 16) | (i << 8) | i;
                aty_st_le32(PALETTE_DATA, col);
            }
        }
    }

    /* initialize palette */

    if (info->chip_gen == rage_M3)
        aty_st_le32(DAC_CNTL, aty_ld_le32(DAC_CNTL) & ~DAC_PALETTE_ACCESS_CNTL);

    if (info->current_par.crtc.bpp == 16)
        aty_st_8(PALETTE_INDEX, (regno << 3));
    else
        aty_st_8(PALETTE_INDEX, regno);
    col = (red << 16) | (green << 8) | blue;
    aty_st_le32(PALETTE_DATA, col);
    if (info->chip_gen == rage_M3) {
    	aty_st_le32(DAC_CNTL, aty_ld_le32(DAC_CNTL) | DAC_PALETTE_ACCESS_CNTL);
        if (info->current_par.crtc.bpp == 16)
            aty_st_8(PALETTE_INDEX, (regno << 3));
        else
            aty_st_8(PALETTE_INDEX, regno);
        aty_st_le32(PALETTE_DATA, col);
    }

    if (regno < 16)
	switch (info->current_par.crtc.bpp) {
#ifdef FBCON_HAS_CFB16
	case 9 ... 16:
	    info->fbcon_cmap.cfb16[regno] = (regno << 10) | (regno << 5) |
                regno;
	    break;
#endif
#ifdef FBCON_HAS_CFB24
	case 17 ... 24:
	    info->fbcon_cmap.cfb24[regno] = (regno << 16) | (regno << 8) |
		regno;
	    break;
#endif
#ifdef FBCON_HAS_CFB32
	case 25 ... 32: {
            u32 i;

            i = (regno << 8) | regno;
            info->fbcon_cmap.cfb32[regno] = (i << 16) | i;
	    break;
        }
#endif
	}
    return 0;
}

#ifdef CONFIG_PMAC_BACKLIGHT
static int backlight_conv[] = {
	0xff, 0xc0, 0xb5, 0xaa, 0x9f, 0x94, 0x89, 0x7e,
	0x73, 0x68, 0x5d, 0x52, 0x47, 0x3c, 0x31, 0x24
};

static int
aty128_set_backlight_enable(int on, int level, void* data)
{
	struct fb_info_aty128 *info = (struct fb_info_aty128 *)data;
	unsigned int reg = aty_ld_le32(LVDS_GEN_CNTL);
	
	reg |= LVDS_BL_MOD_EN | LVDS_BLON;
	if (on && level > BACKLIGHT_OFF) {
		reg &= ~LVDS_BL_MOD_LEVEL_MASK;
		reg |= (backlight_conv[level] << LVDS_BL_MOD_LEVEL_SHIFT);
	} else {
		reg &= ~LVDS_BL_MOD_LEVEL_MASK;
		reg |= (backlight_conv[0] << LVDS_BL_MOD_LEVEL_SHIFT);
	}
	aty_st_le32(LVDS_GEN_CNTL, reg);

	return 0;
}

static int
aty128_set_backlight_level(int level, void* data)
{
	return aty128_set_backlight_enable(1, level, data);
}
#endif /* CONFIG_PMAC_BACKLIGHT */

    /*
     *  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 *info)
{
    u32 save_dp_datatype, save_dp_cntl, bppval;

    if (!width || !height)
        return;

    bppval = bpp_to_depth(info->current_par.crtc.bpp);
    if (bppval == DST_24BPP) {
        srcx *= 3;
        dstx *= 3;
        width *= 3;
    } else if (bppval == -EINVAL) {
        printk("aty128fb: invalid depth\n");
        return;
    }

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

    wait_for_fifo(6, info);
    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 | bppval | SRC_DSTCOLOR);

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

    info->blitter_may_be_busy = 1;

    wait_for_fifo(2, info);
    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);
}


#ifdef FBCON_HAS_CFB8
static void fbcon_aty8_putc(struct vc_data *conp, struct display *p,
                            int c, int yy, int xx)
{
    struct fb_info_aty128 *fb = (struct fb_info_aty128 *)(p->fb_info);

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

    fbcon_cfb8_putc(conp, p, c, yy, xx);
}


static void fbcon_aty8_putcs(struct vc_data *conp, struct display *p,
                             const unsigned short *s, int count,
                             int yy, int xx)
{
    struct fb_info_aty128 *fb = (struct fb_info_aty128 *)(p->fb_info);

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

    fbcon_cfb8_putcs(conp, p, s, count, yy, xx);
}


static void fbcon_aty8_clear_margins(struct vc_data *conp,
                                     struct display *p, int bottom_only)
{
    struct fb_info_aty128 *fb = (struct fb_info_aty128 *)(p->fb_info);

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

    fbcon_cfb8_clear_margins(conp, p, bottom_only);
}

static struct display_switch fbcon_aty128_8 = {
    setup:		fbcon_cfb8_setup,
    bmove:		fbcon_aty128_bmove,
    clear:		fbcon_cfb8_clear,
    putc:		fbcon_aty8_putc,
    putcs:		fbcon_aty8_putcs,
    revc:		fbcon_cfb8_revc,
    clear_margins:	fbcon_aty8_clear_margins,
    fontwidthmask:	FONTWIDTH(4)|FONTWIDTH(8)|FONTWIDTH(12)|FONTWIDTH(16)
};
#endif
#ifdef FBCON_HAS_CFB16
static void fbcon_aty16_putc(struct vc_data *conp, struct display *p,
                            int c, int yy, int xx)
{
    struct fb_info_aty128 *fb = (struct fb_info_aty128 *)(p->fb_info);

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

    fbcon_cfb16_putc(conp, p, c, yy, xx);
}


static void fbcon_aty16_putcs(struct vc_data *conp, struct display *p,
                             const unsigned short *s, int count,
                             int yy, int xx)
{
    struct fb_info_aty128 *fb = (struct fb_info_aty128 *)(p->fb_info);

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

    fbcon_cfb16_putcs(conp, p, s, count, yy, xx);
}


static void fbcon_aty16_clear_margins(struct vc_data *conp,
                                     struct display *p, int bottom_only)
{
    struct fb_info_aty128 *fb = (struct fb_info_aty128 *)(p->fb_info);

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

    fbcon_cfb16_clear_margins(conp, p, bottom_only);
}

static struct display_switch fbcon_aty128_16 = {
    setup:		fbcon_cfb16_setup,
    bmove:		fbcon_aty128_bmove,
    clear:		fbcon_cfb16_clear,
    putc:		fbcon_aty16_putc,
    putcs:		fbcon_aty16_putcs,
    revc:		fbcon_cfb16_revc,
    clear_margins:	fbcon_aty16_clear_margins,
    fontwidthmask:	FONTWIDTH(4)|FONTWIDTH(8)|FONTWIDTH(12)|FONTWIDTH(16)
};
#endif
#ifdef FBCON_HAS_CFB24
static void fbcon_aty24_putc(struct vc_data *conp, struct display *p,
                            int c, int yy, int xx)
{
    struct fb_info_aty128 *fb = (struct fb_info_aty128 *)(p->fb_info);

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

    fbcon_cfb24_putc(conp, p, c, yy, xx);
}


static void fbcon_aty24_putcs(struct vc_data *conp, struct display *p,
                             const unsigned short *s, int count,
                             int yy, int xx)
{
    struct fb_info_aty128 *fb = (struct fb_info_aty128 *)(p->fb_info);

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

    fbcon_cfb24_putcs(conp, p, s, count, yy, xx);
}


static void fbcon_aty24_clear_margins(struct vc_data *conp,
                                     struct display *p, int bottom_only)
{
    struct fb_info_aty128 *fb = (struct fb_info_aty128 *)(p->fb_info);

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

    fbcon_cfb24_clear_margins(conp, p, bottom_only);
}

static struct display_switch fbcon_aty128_24 = {
    setup:		fbcon_cfb24_setup,
    bmove:		fbcon_aty128_bmove,
    clear:		fbcon_cfb24_clear,
    putc:		fbcon_aty24_putc,
    putcs:		fbcon_aty24_putcs,
    revc:		fbcon_cfb24_revc,
    clear_margins:	fbcon_aty24_clear_margins,
    fontwidthmask:	FONTWIDTH(4)|FONTWIDTH(8)|FONTWIDTH(12)|FONTWIDTH(16)
};
#endif
#ifdef FBCON_HAS_CFB32
static void fbcon_aty32_putc(struct vc_data *conp, struct display *p,
                            int c, int yy, int xx)
{
    struct fb_info_aty128 *fb = (struct fb_info_aty128 *)(p->fb_info);

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

    fbcon_cfb32_putc(conp, p, c, yy, xx);
}


static void fbcon_aty32_putcs(struct vc_data *conp, struct display *p,
                             const unsigned short *s, int count,
                             int yy, int xx)
{
    struct fb_info_aty128 *fb = (struct fb_info_aty128 *)(p->fb_info);

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

    fbcon_cfb32_putcs(conp, p, s, count, yy, xx);
}


static void fbcon_aty32_clear_margins(struct vc_data *conp,
                                     struct display *p, int bottom_only)
{
    struct fb_info_aty128 *fb = (struct fb_info_aty128 *)(p->fb_info);

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

    fbcon_cfb32_clear_margins(conp, p, bottom_only);
}

static struct display_switch fbcon_aty128_32 = {
    setup:		fbcon_cfb32_setup,
    bmove:		fbcon_aty128_bmove,
    clear:		fbcon_cfb32_clear,
    putc:		fbcon_aty32_putc,
    putcs:		fbcon_aty32_putcs,
    revc:		fbcon_cfb32_revc,
    clear_margins:	fbcon_aty32_clear_margins,
    fontwidthmask:	FONTWIDTH(4)|FONTWIDTH(8)|FONTWIDTH(12)|FONTWIDTH(16)
};
#endif

#ifdef MODULE
MODULE_AUTHOR("(c)1999-2000 Brad Douglas <brad@neruo.com>");
MODULE_DESCRIPTION("FBDev driver for ATI Rage128 / Pro cards");
MODULE_LICENSE("GPL");
MODULE_PARM(noaccel, "i");
MODULE_PARM_DESC(noaccel, "Disable hardware acceleration (0 or 1=disabled) (default=0)");
MODULE_PARM(font, "s");
MODULE_PARM_DESC(font, "Specify one of the compiled-in fonts (default=none)");
MODULE_PARM(mode, "s");
MODULE_PARM_DESC(mode, "Specify resolution as \"<xres>x<yres>[-<bpp>][@<refresh>]\" ");
#ifdef CONFIG_MTRR
MODULE_PARM(nomtrr, "i");
MODULE_PARM_DESC(nomtrr, "Disable MTRR support (0 or 1=disabled) (default=0)");
#endif

int __init
init_module(void)
{
    if (noaccel) {
        noaccel = 1;
        printk(KERN_INFO "aty128fb: Parameter NOACCEL set\n");
    }
    if (font) {
        strncpy(fontname, font, sizeof(fontname)-1);
        printk(KERN_INFO "aty128fb: Parameter FONT set to %s\n", font);
    }
    if (mode) {
        mode_option = mode;
        printk(KERN_INFO "aty128fb: Parameter MODE set to %s\n", mode);
    }
#ifdef CONFIG_MTRR
    if (nomtrr) {
        mtrr = 0;
        printk(KERN_INFO "aty128fb: Parameter NOMTRR set\n");
    }
#endif
    
    aty128fb_init();
    return 0;
}

void __exit
cleanup_module(void)
{
    struct fb_info_aty128 *info = board_list;

    while (board_list) {
        info = board_list;
        board_list = board_list->next;

        unregister_framebuffer(&info->fb_info);
#ifdef CONFIG_MTRR
        if (info->mtrr.vram_valid)
            mtrr_del(info->mtrr.vram, info->frame_buffer_phys,
                     info->vram_size);
#endif /* CONFIG_MTRR */
        iounmap(info->regbase);
        iounmap(info->frame_buffer);

        release_mem_region(pci_resource_start(info->pdev, 0),
                           pci_resource_len(info->pdev, 0));
        release_mem_region(pci_resource_start(info->pdev, 1),
                           pci_resource_len(info->pdev, 1));
        release_mem_region(pci_resource_start(info->pdev, 2),
                           pci_resource_len(info->pdev, 2));

        kfree(info);
    }
}
#endif /* MODULE */
