/*
 * linux/drivers/video/stifb.c - 
 * Low level Frame buffer driver for HP workstations with 
 * STI (standard text interface) video firmware.
 *
 * Copyright (C) 2001-2006 Helge Deller <deller@gmx.de>
 * Portions Copyright (C) 2001 Thomas Bogendoerfer <tsbogend@alpha.franken.de>
 * 
 * Based on:
 * - linux/drivers/video/artistfb.c -- Artist frame buffer driver
 *      Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
 *   - based on skeletonfb, which was
 *      Created 28 Dec 1997 by Geert Uytterhoeven
 * - HP Xhp cfb-based X11 window driver for XFree86
 *      (c)Copyright 1992 Hewlett-Packard Co.
 *
 * 
 *  The following graphics display devices (NGLE family) are supported by this driver:
 *
 *  HPA4070A    known as "HCRX", a 1280x1024 color device with 8 planes
 *  HPA4071A    known as "HCRX24", a 1280x1024 color device with 24 planes,
 *              optionally available with a hardware accelerator as HPA4071A_Z
 *  HPA1659A    known as "CRX", a 1280x1024 color device with 8 planes
 *  HPA1439A    known as "CRX24", a 1280x1024 color device with 24 planes,
 *              optionally available with a hardware accelerator.
 *  HPA1924A    known as "GRX", a 1280x1024 grayscale device with 8 planes
 *  HPA2269A    known as "Dual CRX", a 1280x1024 color device with 8 planes,
 *              implements support for two displays on a single graphics card.
 *  HP710C      internal graphics support optionally available on the HP9000s710 SPU,
 *              supports 1280x1024 color displays with 8 planes.
 *  HP710G      same as HP710C, 1280x1024 grayscale only
 *  HP710L      same as HP710C, 1024x768 color only
 *  HP712       internal graphics support on HP9000s712 SPU, supports 640x480, 
 *              1024x768 or 1280x1024 color displays on 8 planes (Artist)
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

/* TODO:
 *      - 1bpp mode is completely untested
 *      - add support for h/w acceleration
 *      - add hardware cursor
 *      - automatically disable double buffering (e.g. on RDI precisionbook laptop)
 */


/* on supported graphic devices you may:
 * #define FALLBACK_TO_1BPP to fall back to 1 bpp, or
 * #undef  FALLBACK_TO_1BPP to reject support for unsupported cards */
#undef FALLBACK_TO_1BPP

#undef DEBUG_STIFB_REGS         /* debug sti register accesses */


#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/ioport.h>

#include <asm/grfioctl.h>       /* for HP-UX compatibility */
#include <asm/uaccess.h>

#include "sticore.h"

/* REGION_BASE(fb_info, index) returns the virtual address for region <index> */
#define REGION_BASE(fb_info, index) \
        F_EXTEND(fb_info->sti->glob_cfg->region_ptrs[index])

#define NGLEDEVDEPROM_CRT_REGION 1

#define NR_PALETTE 256

typedef struct {
        __s32   video_config_reg;
        __s32   misc_video_start;
        __s32   horiz_timing_fmt;
        __s32   serr_timing_fmt;
        __s32   vert_timing_fmt;
        __s32   horiz_state;
        __s32   vert_state;
        __s32   vtg_state_elements;
        __s32   pipeline_delay;
        __s32   misc_video_end;
} video_setup_t;

typedef struct {                  
        __s16   sizeof_ngle_data;
        __s16   x_size_visible;     /* visible screen dim in pixels  */
        __s16   y_size_visible;
        __s16   pad2[15];
        __s16   cursor_pipeline_delay;
        __s16   video_interleaves;
        __s32   pad3[11];
} ngle_rom_t;

struct stifb_info {
        struct fb_info info;
        unsigned int id;
        ngle_rom_t ngle_rom;
        struct sti_struct *sti;
        int deviceSpecificConfig;
        u32 pseudo_palette[16];
};

static int __initdata stifb_bpp_pref[MAX_STI_ROMS];

/* ------------------- chipset specific functions -------------------------- */

/* offsets to graphic-chip internal registers */

#define REG_1           0x000118
#define REG_2           0x000480
#define REG_3           0x0004a0
#define REG_4           0x000600
#define REG_6           0x000800
#define REG_8           0x000820
#define REG_9           0x000a04
#define REG_10          0x018000
#define REG_11          0x018004
#define REG_12          0x01800c
#define REG_13          0x018018
#define REG_14          0x01801c
#define REG_15          0x200000
#define REG_15b0        0x200000
#define REG_16b1        0x200005
#define REG_16b3        0x200007
#define REG_21          0x200218
#define REG_22          0x0005a0
#define REG_23          0x0005c0
#define REG_26          0x200118
#define REG_27          0x200308
#define REG_32          0x21003c
#define REG_33          0x210040
#define REG_34          0x200008
#define REG_35          0x018010
#define REG_38          0x210020
#define REG_39          0x210120
#define REG_40          0x210130
#define REG_42          0x210028
#define REG_43          0x21002c
#define REG_44          0x210030
#define REG_45          0x210034

#define READ_BYTE(fb,reg)               gsc_readb((fb)->info.fix.mmio_start + (reg))
#define READ_WORD(fb,reg)               gsc_readl((fb)->info.fix.mmio_start + (reg))


#ifndef DEBUG_STIFB_REGS
# define  DEBUG_OFF()
# define  DEBUG_ON()
# define WRITE_BYTE(value,fb,reg)       gsc_writeb((value),(fb)->info.fix.mmio_start + (reg))
# define WRITE_WORD(value,fb,reg)       gsc_writel((value),(fb)->info.fix.mmio_start + (reg))
#else
  static int debug_on = 1;
# define  DEBUG_OFF() debug_on=0
# define  DEBUG_ON()  debug_on=1
# define WRITE_BYTE(value,fb,reg)       do { if (debug_on) \
                                                printk(KERN_DEBUG "%30s: WRITE_BYTE(0x%06x) = 0x%02x (old=0x%02x)\n", \
                                                        __func__, reg, value, READ_BYTE(fb,reg));                 \
                                        gsc_writeb((value),(fb)->info.fix.mmio_start + (reg)); } while (0)
# define WRITE_WORD(value,fb,reg)       do { if (debug_on) \
                                                printk(KERN_DEBUG "%30s: WRITE_WORD(0x%06x) = 0x%08x (old=0x%08x)\n", \
                                                        __func__, reg, value, READ_WORD(fb,reg));                 \
                                        gsc_writel((value),(fb)->info.fix.mmio_start + (reg)); } while (0)
#endif /* DEBUG_STIFB_REGS */


#define ENABLE  1       /* for enabling/disabling screen */     
#define DISABLE 0

#define NGLE_LOCK(fb_info)      do { } while (0) 
#define NGLE_UNLOCK(fb_info)    do { } while (0)

static void
SETUP_HW(struct stifb_info *fb)
{
        char stat;

        do {
                stat = READ_BYTE(fb, REG_15b0);
                if (!stat)
                        stat = READ_BYTE(fb, REG_15b0);
        } while (stat);
}


static void
SETUP_FB(struct stifb_info *fb)
{       
        unsigned int reg10_value = 0;
        
        SETUP_HW(fb);
        switch (fb->id)
        {
                case CRT_ID_VISUALIZE_EG:
                case S9000_ID_ARTIST:
                case S9000_ID_A1659A:
                        reg10_value = 0x13601000;
                        break;
                case S9000_ID_A1439A:
                        if (fb->info.var.bits_per_pixel == 32)                                          
                                reg10_value = 0xBBA0A000;
                        else 
                                reg10_value = 0x13601000;
                        break;
                case S9000_ID_HCRX:
                        if (fb->info.var.bits_per_pixel == 32)
                                reg10_value = 0xBBA0A000;
                        else                                    
                                reg10_value = 0x13602000;
                        break;
                case S9000_ID_TIMBER:
                case CRX24_OVERLAY_PLANES:
                        reg10_value = 0x13602000;
                        break;
        }
        if (reg10_value)
                WRITE_WORD(reg10_value, fb, REG_10);
        WRITE_WORD(0x83000300, fb, REG_14);
        SETUP_HW(fb);
        WRITE_BYTE(1, fb, REG_16b1);
}

static void
START_IMAGE_COLORMAP_ACCESS(struct stifb_info *fb)
{
        SETUP_HW(fb);
        WRITE_WORD(0xBBE0F000, fb, REG_10);
        WRITE_WORD(0x03000300, fb, REG_14);
        WRITE_WORD(~0, fb, REG_13);
}

static void
WRITE_IMAGE_COLOR(struct stifb_info *fb, int index, int color) 
{
        SETUP_HW(fb);
        WRITE_WORD(((0x100+index)<<2), fb, REG_3);
        WRITE_WORD(color, fb, REG_4);
}

static void
FINISH_IMAGE_COLORMAP_ACCESS(struct stifb_info *fb) 
{               
        WRITE_WORD(0x400, fb, REG_2);
        if (fb->info.var.bits_per_pixel == 32) {
                WRITE_WORD(0x83000100, fb, REG_1);
        } else {
                if (fb->id == S9000_ID_ARTIST || fb->id == CRT_ID_VISUALIZE_EG)
                        WRITE_WORD(0x80000100, fb, REG_26);
                else                                                    
                        WRITE_WORD(0x80000100, fb, REG_1);
        }
        SETUP_FB(fb);
}

static void
SETUP_RAMDAC(struct stifb_info *fb) 
{
        SETUP_HW(fb);
        WRITE_WORD(0x04000000, fb, 0x1020);
        WRITE_WORD(0xff000000, fb, 0x1028);
}

static void 
CRX24_SETUP_RAMDAC(struct stifb_info *fb) 
{
        SETUP_HW(fb);
        WRITE_WORD(0x04000000, fb, 0x1000);
        WRITE_WORD(0x02000000, fb, 0x1004);
        WRITE_WORD(0xff000000, fb, 0x1008);
        WRITE_WORD(0x05000000, fb, 0x1000);
        WRITE_WORD(0x02000000, fb, 0x1004);
        WRITE_WORD(0x03000000, fb, 0x1008);
}

#if 0
static void 
HCRX_SETUP_RAMDAC(struct stifb_info *fb)
{
        WRITE_WORD(0xffffffff, fb, REG_32);
}
#endif

static void 
CRX24_SET_OVLY_MASK(struct stifb_info *fb)
{
        SETUP_HW(fb);
        WRITE_WORD(0x13a02000, fb, REG_11);
        WRITE_WORD(0x03000300, fb, REG_14);
        WRITE_WORD(0x000017f0, fb, REG_3);
        WRITE_WORD(0xffffffff, fb, REG_13);
        WRITE_WORD(0xffffffff, fb, REG_22);
        WRITE_WORD(0x00000000, fb, REG_23);
}

static void
ENABLE_DISABLE_DISPLAY(struct stifb_info *fb, int enable)
{
        unsigned int value = enable ? 0x43000000 : 0x03000000;
        SETUP_HW(fb);
        WRITE_WORD(0x06000000,  fb, 0x1030);
        WRITE_WORD(value,       fb, 0x1038);
}

static void 
CRX24_ENABLE_DISABLE_DISPLAY(struct stifb_info *fb, int enable)
{
        unsigned int value = enable ? 0x10000000 : 0x30000000;
        SETUP_HW(fb);
        WRITE_WORD(0x01000000,  fb, 0x1000);
        WRITE_WORD(0x02000000,  fb, 0x1004);
        WRITE_WORD(value,       fb, 0x1008);
}

static void
ARTIST_ENABLE_DISABLE_DISPLAY(struct stifb_info *fb, int enable) 
{
        u32 DregsMiscVideo = REG_21;
        u32 DregsMiscCtl = REG_27;
        
        SETUP_HW(fb);
        if (enable) {
          WRITE_WORD(READ_WORD(fb, DregsMiscVideo) | 0x0A000000, fb, DregsMiscVideo);
          WRITE_WORD(READ_WORD(fb, DregsMiscCtl)   | 0x00800000, fb, DregsMiscCtl);
        } else {
          WRITE_WORD(READ_WORD(fb, DregsMiscVideo) & ~0x0A000000, fb, DregsMiscVideo);
          WRITE_WORD(READ_WORD(fb, DregsMiscCtl)   & ~0x00800000, fb, DregsMiscCtl);
        }
}

#define GET_ROMTABLE_INDEX(fb) \
        (READ_BYTE(fb, REG_16b3) - 1)

#define HYPER_CONFIG_PLANES_24 0x00000100
        
#define IS_24_DEVICE(fb) \
        (fb->deviceSpecificConfig & HYPER_CONFIG_PLANES_24)

#define IS_888_DEVICE(fb) \
        (!(IS_24_DEVICE(fb)))

#define GET_FIFO_SLOTS(fb, cnt, numslots)       \
{       while (cnt < numslots)                  \
                cnt = READ_WORD(fb, REG_34);    \
        cnt -= numslots;                        \
}

#define     IndexedDcd  0       /* Pixel data is indexed (pseudo) color */
#define     Otc04       2       /* Pixels in each longword transfer (4) */
#define     Otc32       5       /* Pixels in each longword transfer (32) */
#define     Ots08       3       /* Each pixel is size (8)d transfer (1) */
#define     OtsIndirect 6       /* Each bit goes through FG/BG color(8) */
#define     AddrLong    5       /* FB address is Long aligned (pixel) */
#define     BINovly     0x2     /* 8 bit overlay */
#define     BINapp0I    0x0     /* Application Buffer 0, Indexed */
#define     BINapp1I    0x1     /* Application Buffer 1, Indexed */
#define     BINapp0F8   0xa     /* Application Buffer 0, Fractional 8-8-8 */
#define     BINattr     0xd     /* Attribute Bitmap */
#define     RopSrc      0x3
#define     BitmapExtent08  3   /* Each write hits ( 8) bits in depth */
#define     BitmapExtent32  5   /* Each write hits (32) bits in depth */
#define     DataDynamic     0   /* Data register reloaded by direct access */
#define     MaskDynamic     1   /* Mask register reloaded by direct access */
#define     MaskOtc         0   /* Mask contains Object Count valid bits */

#define MaskAddrOffset(offset) (offset)
#define StaticReg(en) (en)
#define BGx(en) (en)
#define FGx(en) (en)

#define BAJustPoint(offset) (offset)
#define BAIndexBase(base) (base)
#define BA(F,C,S,A,J,B,I) \
        (((F)<<31)|((C)<<27)|((S)<<24)|((A)<<21)|((J)<<16)|((B)<<12)|(I))

#define IBOvals(R,M,X,S,D,L,B,F) \
        (((R)<<8)|((M)<<16)|((X)<<24)|((S)<<29)|((D)<<28)|((L)<<31)|((B)<<1)|(F))

#define NGLE_QUICK_SET_IMAGE_BITMAP_OP(fb, val) \
        WRITE_WORD(val, fb, REG_14)

#define NGLE_QUICK_SET_DST_BM_ACCESS(fb, val) \
        WRITE_WORD(val, fb, REG_11)

#define NGLE_QUICK_SET_CTL_PLN_REG(fb, val) \
        WRITE_WORD(val, fb, REG_12)

#define NGLE_REALLY_SET_IMAGE_PLANEMASK(fb, plnmsk32) \
        WRITE_WORD(plnmsk32, fb, REG_13)

#define NGLE_REALLY_SET_IMAGE_FG_COLOR(fb, fg32) \
        WRITE_WORD(fg32, fb, REG_35)

#define NGLE_SET_TRANSFERDATA(fb, val) \
        WRITE_WORD(val, fb, REG_8)

#define NGLE_SET_DSTXY(fb, val) \
        WRITE_WORD(val, fb, REG_6)

#define NGLE_LONG_FB_ADDRESS(fbaddrbase, x, y) (                \
        (u32) (fbaddrbase) +                                    \
            (   (unsigned int)  ( (y) << 13      ) |            \
                (unsigned int)  ( (x) << 2       )      )       \
        )

#define NGLE_BINC_SET_DSTADDR(fb, addr) \
        WRITE_WORD(addr, fb, REG_3)

#define NGLE_BINC_SET_SRCADDR(fb, addr) \
        WRITE_WORD(addr, fb, REG_2)

#define NGLE_BINC_SET_DSTMASK(fb, mask) \
        WRITE_WORD(mask, fb, REG_22)

#define NGLE_BINC_WRITE32(fb, data32) \
        WRITE_WORD(data32, fb, REG_23)

#define START_COLORMAPLOAD(fb, cmapBltCtlData32) \
        WRITE_WORD((cmapBltCtlData32), fb, REG_38)

#define SET_LENXY_START_RECFILL(fb, lenxy) \
        WRITE_WORD(lenxy, fb, REG_9)

static void
HYPER_ENABLE_DISABLE_DISPLAY(struct stifb_info *fb, int enable)
{
        u32 DregsHypMiscVideo = REG_33;
        unsigned int value;
        SETUP_HW(fb);
        value = READ_WORD(fb, DregsHypMiscVideo);
        if (enable)
                value |= 0x0A000000;
        else
                value &= ~0x0A000000;
        WRITE_WORD(value, fb, DregsHypMiscVideo);
}


/* BufferNumbers used by SETUP_ATTR_ACCESS() */
#define BUFF0_CMAP0     0x00001e02
#define BUFF1_CMAP0     0x02001e02
#define BUFF1_CMAP3     0x0c001e02
#define ARTIST_CMAP0    0x00000102
#define HYPER_CMAP8     0x00000100
#define HYPER_CMAP24    0x00000800

static void
SETUP_ATTR_ACCESS(struct stifb_info *fb, unsigned BufferNumber)
{
        SETUP_HW(fb);
        WRITE_WORD(0x2EA0D000, fb, REG_11);
        WRITE_WORD(0x23000302, fb, REG_14);
        WRITE_WORD(BufferNumber, fb, REG_12);
        WRITE_WORD(0xffffffff, fb, REG_8);
}

static void
SET_ATTR_SIZE(struct stifb_info *fb, int width, int height) 
{
        /* REG_6 seems to have special values when run on a 
           RDI precisionbook parisc laptop (INTERNAL_EG_DX1024 or
           INTERNAL_EG_X1024).  The values are:
                0x2f0: internal (LCD) & external display enabled
                0x2a0: external display only
                0x000: zero on standard artist graphic cards
        */ 
        WRITE_WORD(0x00000000, fb, REG_6);
        WRITE_WORD((width<<16) | height, fb, REG_9);
        WRITE_WORD(0x05000000, fb, REG_6);
        WRITE_WORD(0x00040001, fb, REG_9);
}

static void
FINISH_ATTR_ACCESS(struct stifb_info *fb) 
{
        SETUP_HW(fb);
        WRITE_WORD(0x00000000, fb, REG_12);
}

static void
elkSetupPlanes(struct stifb_info *fb)
{
        SETUP_RAMDAC(fb);
        SETUP_FB(fb);
}

static void 
ngleSetupAttrPlanes(struct stifb_info *fb, int BufferNumber)
{
        SETUP_ATTR_ACCESS(fb, BufferNumber);
        SET_ATTR_SIZE(fb, fb->info.var.xres, fb->info.var.yres);
        FINISH_ATTR_ACCESS(fb);
        SETUP_FB(fb);
}


static void
rattlerSetupPlanes(struct stifb_info *fb)
{
        int saved_id, y;

        /* Write RAMDAC pixel read mask register so all overlay
         * planes are display-enabled.  (CRX24 uses Bt462 pixel
         * read mask register for overlay planes, not image planes).
         */
        CRX24_SETUP_RAMDAC(fb);
    
        /* change fb->id temporarily to fool SETUP_FB() */
        saved_id = fb->id;
        fb->id = CRX24_OVERLAY_PLANES;
        SETUP_FB(fb);
        fb->id = saved_id;

        for (y = 0; y < fb->info.var.yres; ++y)
                memset(fb->info.screen_base + y * fb->info.fix.line_length,
                        0xff, fb->info.var.xres * fb->info.var.bits_per_pixel/8);

        CRX24_SET_OVLY_MASK(fb);
        SETUP_FB(fb);
}


#define HYPER_CMAP_TYPE                         0
#define NGLE_CMAP_INDEXED0_TYPE                 0
#define NGLE_CMAP_OVERLAY_TYPE                  3

/* typedef of LUT (Colormap) BLT Control Register */
typedef union   /* Note assumption that fields are packed left-to-right */
{       u32 all;
        struct
        {
                unsigned enable              :  1;
                unsigned waitBlank           :  1;
                unsigned reserved1           :  4;
                unsigned lutOffset           : 10;   /* Within destination LUT */
                unsigned lutType             :  2;   /* Cursor, image, overlay */
                unsigned reserved2           :  4;
                unsigned length              : 10;
        } fields;
} NgleLutBltCtl;


#if 0
static NgleLutBltCtl
setNgleLutBltCtl(struct stifb_info *fb, int offsetWithinLut, int length)
{
        NgleLutBltCtl lutBltCtl;

        /* set enable, zero reserved fields */
        lutBltCtl.all           = 0x80000000;
        lutBltCtl.fields.length = length;

        switch (fb->id) 
        {
        case S9000_ID_A1439A:           /* CRX24 */
                if (fb->var.bits_per_pixel == 8) {
                        lutBltCtl.fields.lutType = NGLE_CMAP_OVERLAY_TYPE;
                        lutBltCtl.fields.lutOffset = 0;
                } else {
                        lutBltCtl.fields.lutType = NGLE_CMAP_INDEXED0_TYPE;
                        lutBltCtl.fields.lutOffset = 0 * 256;
                }
                break;
                
        case S9000_ID_ARTIST:
                lutBltCtl.fields.lutType = NGLE_CMAP_INDEXED0_TYPE;
                lutBltCtl.fields.lutOffset = 0 * 256;
                break;
                
        default:
                lutBltCtl.fields.lutType = NGLE_CMAP_INDEXED0_TYPE;
                lutBltCtl.fields.lutOffset = 0;
                break;
        }

        /* Offset points to start of LUT.  Adjust for within LUT */
        lutBltCtl.fields.lutOffset += offsetWithinLut;

        return lutBltCtl;
}
#endif

static NgleLutBltCtl
setHyperLutBltCtl(struct stifb_info *fb, int offsetWithinLut, int length) 
{
        NgleLutBltCtl lutBltCtl;

        /* set enable, zero reserved fields */
        lutBltCtl.all = 0x80000000;

        lutBltCtl.fields.length = length;
        lutBltCtl.fields.lutType = HYPER_CMAP_TYPE;

        /* Expect lutIndex to be 0 or 1 for image cmaps, 2 or 3 for overlay cmaps */
        if (fb->info.var.bits_per_pixel == 8)
                lutBltCtl.fields.lutOffset = 2 * 256;
        else
                lutBltCtl.fields.lutOffset = 0 * 256;

        /* Offset points to start of LUT.  Adjust for within LUT */
        lutBltCtl.fields.lutOffset += offsetWithinLut;

        return lutBltCtl;
}


static void hyperUndoITE(struct stifb_info *fb)
{
        int nFreeFifoSlots = 0;
        u32 fbAddr;

        NGLE_LOCK(fb);

        GET_FIFO_SLOTS(fb, nFreeFifoSlots, 1);
        WRITE_WORD(0xffffffff, fb, REG_32);

        /* Write overlay transparency mask so only entry 255 is transparent */

        /* Hardware setup for full-depth write to "magic" location */
        GET_FIFO_SLOTS(fb, nFreeFifoSlots, 7);
        NGLE_QUICK_SET_DST_BM_ACCESS(fb, 
                BA(IndexedDcd, Otc04, Ots08, AddrLong,
                BAJustPoint(0), BINovly, BAIndexBase(0)));
        NGLE_QUICK_SET_IMAGE_BITMAP_OP(fb,
                IBOvals(RopSrc, MaskAddrOffset(0),
                BitmapExtent08, StaticReg(0),
                DataDynamic, MaskOtc, BGx(0), FGx(0)));

        /* Now prepare to write to the "magic" location */
        fbAddr = NGLE_LONG_FB_ADDRESS(0, 1532, 0);
        NGLE_BINC_SET_DSTADDR(fb, fbAddr);
        NGLE_REALLY_SET_IMAGE_PLANEMASK(fb, 0xffffff);
        NGLE_BINC_SET_DSTMASK(fb, 0xffffffff);

        /* Finally, write a zero to clear the mask */
        NGLE_BINC_WRITE32(fb, 0);

        NGLE_UNLOCK(fb);
}

static void 
ngleDepth8_ClearImagePlanes(struct stifb_info *fb)
{
        /* FIXME! */
}

static void 
ngleDepth24_ClearImagePlanes(struct stifb_info *fb)
{
        /* FIXME! */
}

static void
ngleResetAttrPlanes(struct stifb_info *fb, unsigned int ctlPlaneReg)
{
        int nFreeFifoSlots = 0;
        u32 packed_dst;
        u32 packed_len;

        NGLE_LOCK(fb);

        GET_FIFO_SLOTS(fb, nFreeFifoSlots, 4);
        NGLE_QUICK_SET_DST_BM_ACCESS(fb, 
                                     BA(IndexedDcd, Otc32, OtsIndirect,
                                        AddrLong, BAJustPoint(0),
                                        BINattr, BAIndexBase(0)));
        NGLE_QUICK_SET_CTL_PLN_REG(fb, ctlPlaneReg);
        NGLE_SET_TRANSFERDATA(fb, 0xffffffff);

        NGLE_QUICK_SET_IMAGE_BITMAP_OP(fb,
                                       IBOvals(RopSrc, MaskAddrOffset(0),
                                               BitmapExtent08, StaticReg(1),
                                               DataDynamic, MaskOtc,
                                               BGx(0), FGx(0)));
        packed_dst = 0;
        packed_len = (fb->info.var.xres << 16) | fb->info.var.yres;
        GET_FIFO_SLOTS(fb, nFreeFifoSlots, 2);
        NGLE_SET_DSTXY(fb, packed_dst);
        SET_LENXY_START_RECFILL(fb, packed_len);

        /*
         * In order to work around an ELK hardware problem (Buffy doesn't
         * always flush it's buffers when writing to the attribute
         * planes), at least 4 pixels must be written to the attribute
         * planes starting at (X == 1280) and (Y != to the last Y written
         * by BIF):
         */

        if (fb->id == S9000_ID_A1659A) {   /* ELK_DEVICE_ID */
                /* It's safe to use scanline zero: */
                packed_dst = (1280 << 16);
                GET_FIFO_SLOTS(fb, nFreeFifoSlots, 2);
                NGLE_SET_DSTXY(fb, packed_dst);
                packed_len = (4 << 16) | 1;
                SET_LENXY_START_RECFILL(fb, packed_len);
        }   /* ELK Hardware Kludge */

        /**** Finally, set the Control Plane Register back to zero: ****/
        GET_FIFO_SLOTS(fb, nFreeFifoSlots, 1);
        NGLE_QUICK_SET_CTL_PLN_REG(fb, 0);
        
        NGLE_UNLOCK(fb);
}
    
static void
ngleClearOverlayPlanes(struct stifb_info *fb, int mask, int data)
{
        int nFreeFifoSlots = 0;
        u32 packed_dst;
        u32 packed_len;
    
        NGLE_LOCK(fb);

        /* Hardware setup */
        GET_FIFO_SLOTS(fb, nFreeFifoSlots, 8);
        NGLE_QUICK_SET_DST_BM_ACCESS(fb, 
                                     BA(IndexedDcd, Otc04, Ots08, AddrLong,
                                        BAJustPoint(0), BINovly, BAIndexBase(0)));

        NGLE_SET_TRANSFERDATA(fb, 0xffffffff);  /* Write foreground color */

        NGLE_REALLY_SET_IMAGE_FG_COLOR(fb, data);
        NGLE_REALLY_SET_IMAGE_PLANEMASK(fb, mask);
    
        packed_dst = 0;
        packed_len = (fb->info.var.xres << 16) | fb->info.var.yres;
        NGLE_SET_DSTXY(fb, packed_dst);
    
        /* Write zeroes to overlay planes */                   
        NGLE_QUICK_SET_IMAGE_BITMAP_OP(fb,
                                       IBOvals(RopSrc, MaskAddrOffset(0),
                                               BitmapExtent08, StaticReg(0),
                                               DataDynamic, MaskOtc, BGx(0), FGx(0)));
                       
        SET_LENXY_START_RECFILL(fb, packed_len);

        NGLE_UNLOCK(fb);
}

static void 
hyperResetPlanes(struct stifb_info *fb, int enable)
{
        unsigned int controlPlaneReg;

        NGLE_LOCK(fb);

        if (IS_24_DEVICE(fb))
                if (fb->info.var.bits_per_pixel == 32)
                        controlPlaneReg = 0x04000F00;
                else
                        controlPlaneReg = 0x00000F00;   /* 0x00000800 should be enough, but lets clear all 4 bits */
        else
                controlPlaneReg = 0x00000F00; /* 0x00000100 should be enough, but lets clear all 4 bits */

        switch (enable) {
        case ENABLE:
                /* clear screen */
                if (IS_24_DEVICE(fb))
                        ngleDepth24_ClearImagePlanes(fb);
                else
                        ngleDepth8_ClearImagePlanes(fb);

                /* Paint attribute planes for default case.
                 * On Hyperdrive, this means all windows using overlay cmap 0. */
                ngleResetAttrPlanes(fb, controlPlaneReg);

                /* clear overlay planes */
                ngleClearOverlayPlanes(fb, 0xff, 255);

                /**************************************************
                 ** Also need to counteract ITE settings 
                 **************************************************/
                hyperUndoITE(fb);
                break;

        case DISABLE:
                /* clear screen */
                if (IS_24_DEVICE(fb))
                        ngleDepth24_ClearImagePlanes(fb);
                else
                        ngleDepth8_ClearImagePlanes(fb);
                ngleResetAttrPlanes(fb, controlPlaneReg);
                ngleClearOverlayPlanes(fb, 0xff, 0);
                break;

        case -1:        /* RESET */
                hyperUndoITE(fb);
                ngleResetAttrPlanes(fb, controlPlaneReg);
                break;
        }
        
        NGLE_UNLOCK(fb);
}

/* Return pointer to in-memory structure holding ELK device-dependent ROM values. */

static void 
ngleGetDeviceRomData(struct stifb_info *fb)
{
#if 0
XXX: FIXME: !!!
        int     *pBytePerLongDevDepData;/* data byte == LSB */
        int     *pRomTable;
        NgleDevRomData  *pPackedDevRomData;
        int     sizePackedDevRomData = sizeof(*pPackedDevRomData);
        char    *pCard8;
        int     i;
        char    *mapOrigin = NULL;
    
        int romTableIdx;

        pPackedDevRomData = fb->ngle_rom;

        SETUP_HW(fb);
        if (fb->id == S9000_ID_ARTIST) {
                pPackedDevRomData->cursor_pipeline_delay = 4;
                pPackedDevRomData->video_interleaves     = 4;
        } else {
                /* Get pointer to unpacked byte/long data in ROM */
                pBytePerLongDevDepData = fb->sti->regions[NGLEDEVDEPROM_CRT_REGION];

                /* Tomcat supports several resolutions: 1280x1024, 1024x768, 640x480 */
                if (fb->id == S9000_ID_TOMCAT)
        {
            /*  jump to the correct ROM table  */
            GET_ROMTABLE_INDEX(romTableIdx);
            while  (romTableIdx > 0)
            {
                pCard8 = (Card8 *) pPackedDevRomData;
                pRomTable = pBytePerLongDevDepData;
                /* Pack every fourth byte from ROM into structure */
                for (i = 0; i < sizePackedDevRomData; i++)
                {
                    *pCard8++ = (Card8) (*pRomTable++);
                }

                pBytePerLongDevDepData = (Card32 *)
                        ((Card8 *) pBytePerLongDevDepData +
                               pPackedDevRomData->sizeof_ngle_data);

                romTableIdx--;
            }
        }

        pCard8 = (Card8 *) pPackedDevRomData;

        /* Pack every fourth byte from ROM into structure */
        for (i = 0; i < sizePackedDevRomData; i++)
        {
            *pCard8++ = (Card8) (*pBytePerLongDevDepData++);
        }
    }

    SETUP_FB(fb);
#endif
}


#define HYPERBOWL_MODE_FOR_8_OVER_88_LUT0_NO_TRANSPARENCIES     4
#define HYPERBOWL_MODE01_8_24_LUT0_TRANSPARENT_LUT1_OPAQUE      8
#define HYPERBOWL_MODE01_8_24_LUT0_OPAQUE_LUT1_OPAQUE           10
#define HYPERBOWL_MODE2_8_24                                    15

/* HCRX specific boot-time initialization */
static void __init
SETUP_HCRX(struct stifb_info *fb)
{
        int     hyperbowl;
        int     nFreeFifoSlots = 0;

        if (fb->id != S9000_ID_HCRX)
                return;

        /* Initialize Hyperbowl registers */
        GET_FIFO_SLOTS(fb, nFreeFifoSlots, 7);
        
        if (IS_24_DEVICE(fb)) {
                hyperbowl = (fb->info.var.bits_per_pixel == 32) ?
                        HYPERBOWL_MODE01_8_24_LUT0_TRANSPARENT_LUT1_OPAQUE :
                        HYPERBOWL_MODE01_8_24_LUT0_OPAQUE_LUT1_OPAQUE;

                /* First write to Hyperbowl must happen twice (bug) */
                WRITE_WORD(hyperbowl, fb, REG_40);
                WRITE_WORD(hyperbowl, fb, REG_40);
                
                WRITE_WORD(HYPERBOWL_MODE2_8_24, fb, REG_39);
                
                WRITE_WORD(0x014c0148, fb, REG_42); /* Set lut 0 to be the direct color */
                WRITE_WORD(0x404c4048, fb, REG_43);
                WRITE_WORD(0x034c0348, fb, REG_44);
                WRITE_WORD(0x444c4448, fb, REG_45);
        } else {
                hyperbowl = HYPERBOWL_MODE_FOR_8_OVER_88_LUT0_NO_TRANSPARENCIES;

                /* First write to Hyperbowl must happen twice (bug) */
                WRITE_WORD(hyperbowl, fb, REG_40);
                WRITE_WORD(hyperbowl, fb, REG_40);

                WRITE_WORD(0x00000000, fb, REG_42);
                WRITE_WORD(0x00000000, fb, REG_43);
                WRITE_WORD(0x00000000, fb, REG_44);
                WRITE_WORD(0x444c4048, fb, REG_45);
        }
}


/* ------------------- driver specific functions --------------------------- */

static int
stifb_setcolreg(u_int regno, u_int red, u_int green,
              u_int blue, u_int transp, struct fb_info *info)
{
        struct stifb_info *fb = (struct stifb_info *) info;
        u32 color;

        if (regno >= NR_PALETTE)
                return 1;

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

        DEBUG_OFF();

        START_IMAGE_COLORMAP_ACCESS(fb);

        if (unlikely(fb->info.var.grayscale)) {
                /* gray = 0.30*R + 0.59*G + 0.11*B */
                color = ((red * 77) +
                         (green * 151) +
                         (blue * 28)) >> 8;
        } else {
                color = ((red << 16) |
                         (green << 8) |
                         (blue));
        }

        if (fb->info.fix.visual == FB_VISUAL_DIRECTCOLOR) {
                struct fb_var_screeninfo *var = &fb->info.var;
                if (regno < 16)
                        ((u32 *)fb->info.pseudo_palette)[regno] =
                                regno << var->red.offset |
                                regno << var->green.offset |
                                regno << var->blue.offset;
        }

        WRITE_IMAGE_COLOR(fb, regno, color);

        if (fb->id == S9000_ID_HCRX) {
                NgleLutBltCtl lutBltCtl;

                lutBltCtl = setHyperLutBltCtl(fb,
                                0,      /* Offset w/i LUT */
                                256);   /* Load entire LUT */
                NGLE_BINC_SET_SRCADDR(fb,
                                NGLE_LONG_FB_ADDRESS(0, 0x100, 0)); 
                                /* 0x100 is same as used in WRITE_IMAGE_COLOR() */
                START_COLORMAPLOAD(fb, lutBltCtl.all);
                SETUP_FB(fb);
        } else {
                /* cleanup colormap hardware */
                FINISH_IMAGE_COLORMAP_ACCESS(fb);
        }

        DEBUG_ON();

        return 0;
}

static int
stifb_blank(int blank_mode, struct fb_info *info)
{
        struct stifb_info *fb = (struct stifb_info *) info;
        int enable = (blank_mode == 0) ? ENABLE : DISABLE;

        switch (fb->id) {
        case S9000_ID_A1439A:
                CRX24_ENABLE_DISABLE_DISPLAY(fb, enable);
                break;
        case CRT_ID_VISUALIZE_EG:
        case S9000_ID_ARTIST:
                ARTIST_ENABLE_DISABLE_DISPLAY(fb, enable);
                break;
        case S9000_ID_HCRX:
                HYPER_ENABLE_DISABLE_DISPLAY(fb, enable);
                break;
        case S9000_ID_A1659A:   /* fall through */
        case S9000_ID_TIMBER:
        case CRX24_OVERLAY_PLANES:
        default:
                ENABLE_DISABLE_DISPLAY(fb, enable);
                break;

        }
        
        SETUP_FB(fb);
        return 0;
}

static void __init
stifb_init_display(struct stifb_info *fb)
{
        int id = fb->id;

        SETUP_FB(fb);

        /* HCRX specific initialization */
        SETUP_HCRX(fb);
        
        /*
        if (id == S9000_ID_HCRX)
                hyperInitSprite(fb);
        else
                ngleInitSprite(fb);
        */
        
        /* Initialize the image planes. */ 
        switch (id) {
         case S9000_ID_HCRX:
            hyperResetPlanes(fb, ENABLE);
            break;
         case S9000_ID_A1439A:
            rattlerSetupPlanes(fb);
            break;
         case S9000_ID_A1659A:
         case S9000_ID_ARTIST:
         case CRT_ID_VISUALIZE_EG:
            elkSetupPlanes(fb);
            break;
        }

        /* Clear attribute planes on non HCRX devices. */
        switch (id) {
         case S9000_ID_A1659A:
         case S9000_ID_A1439A:
            if (fb->info.var.bits_per_pixel == 32)
                ngleSetupAttrPlanes(fb, BUFF1_CMAP3);
            else {
                ngleSetupAttrPlanes(fb, BUFF1_CMAP0);
            }
            if (id == S9000_ID_A1439A)
                ngleClearOverlayPlanes(fb, 0xff, 0);
            break;
         case S9000_ID_ARTIST:
         case CRT_ID_VISUALIZE_EG:
            if (fb->info.var.bits_per_pixel == 32)
                ngleSetupAttrPlanes(fb, BUFF1_CMAP3);
            else {
                ngleSetupAttrPlanes(fb, ARTIST_CMAP0);
            }
            break;
        }
        stifb_blank(0, (struct fb_info *)fb);   /* 0=enable screen */

        SETUP_FB(fb);
}

/* ------------ Interfaces to hardware functions ------------ */

static struct fb_ops stifb_ops = {
        .owner          = THIS_MODULE,
        .fb_setcolreg   = stifb_setcolreg,
        .fb_blank       = stifb_blank,
        .fb_fillrect    = cfb_fillrect,
        .fb_copyarea    = cfb_copyarea,
        .fb_imageblit   = cfb_imageblit,
};


/*
 *  Initialization
 */

static int __init stifb_init_fb(struct sti_struct *sti, int bpp_pref)
{
        struct fb_fix_screeninfo *fix;
        struct fb_var_screeninfo *var;
        struct stifb_info *fb;
        struct fb_info *info;
        unsigned long sti_rom_address;
        char *dev_name;
        int bpp, xres, yres;

        fb = kzalloc(sizeof(*fb), GFP_ATOMIC);
        if (!fb) {
                printk(KERN_ERR "stifb: Could not allocate stifb structure\n");
                return -ENODEV;
        }
        
        info = &fb->info;

        /* set struct to a known state */
        fix = &info->fix;
        var = &info->var;

        fb->sti = sti;
        dev_name = sti->sti_data->inq_outptr.dev_name;
        /* store upper 32bits of the graphics id */
        fb->id = fb->sti->graphics_id[0];

        /* only supported cards are allowed */
        switch (fb->id) {
        case CRT_ID_VISUALIZE_EG:
                /* Visualize cards can run either in "double buffer" or
                  "standard" mode. Depending on the mode, the card reports
                  a different device name, e.g. "INTERNAL_EG_DX1024" in double
                  buffer mode and "INTERNAL_EG_X1024" in standard mode.
                  Since this driver only supports standard mode, we check
                  if the device name contains the string "DX" and tell the
                  user how to reconfigure the card. */
                if (strstr(dev_name, "DX")) {
                   printk(KERN_WARNING
"WARNING: stifb framebuffer driver does not support '%s' in double-buffer mode.\n"
"WARNING: Please disable the double-buffer mode in IPL menu (the PARISC-BIOS).\n",
                        dev_name);
                   goto out_err0;
                }
                /* fall though */
        case S9000_ID_ARTIST:
        case S9000_ID_HCRX:
        case S9000_ID_TIMBER:
        case S9000_ID_A1659A:
        case S9000_ID_A1439A:
                break;
        default:
                printk(KERN_WARNING "stifb: '%s' (id: 0x%08x) not supported.\n",
                        dev_name, fb->id);
                goto out_err0;
        }
        
        /* default to 8 bpp on most graphic chips */
        bpp = 8;
        xres = sti_onscreen_x(fb->sti);
        yres = sti_onscreen_y(fb->sti);

        ngleGetDeviceRomData(fb);

        /* get (virtual) io region base addr */
        fix->mmio_start = REGION_BASE(fb,2);
        fix->mmio_len   = 0x400000;

        /* Reject any device not in the NGLE family */
        switch (fb->id) {
        case S9000_ID_A1659A:   /* CRX/A1659A */
                break;
        case S9000_ID_ELM:      /* GRX, grayscale but else same as A1659A */
                var->grayscale = 1;
                fb->id = S9000_ID_A1659A;
                break;
        case S9000_ID_TIMBER:   /* HP9000/710 Any (may be a grayscale device) */
                if (strstr(dev_name, "GRAYSCALE") || 
                    strstr(dev_name, "Grayscale") ||
                    strstr(dev_name, "grayscale"))
                        var->grayscale = 1;
                break;
        case S9000_ID_TOMCAT:   /* Dual CRX, behaves else like a CRX */
                /* FIXME: TomCat supports two heads:
                 * fb.iobase = REGION_BASE(fb_info,3);
                 * fb.screen_base = ioremap_nocache(REGION_BASE(fb_info,2),xxx);
                 * for now we only support the left one ! */
                xres = fb->ngle_rom.x_size_visible;
                yres = fb->ngle_rom.y_size_visible;
                fb->id = S9000_ID_A1659A;
                break;
        case S9000_ID_A1439A:   /* CRX24/A1439A */
                bpp = 32;
                break;
        case S9000_ID_HCRX:     /* Hyperdrive/HCRX */
                memset(&fb->ngle_rom, 0, sizeof(fb->ngle_rom));
                if ((fb->sti->regions_phys[0] & 0xfc000000) ==
                    (fb->sti->regions_phys[2] & 0xfc000000))
                        sti_rom_address = F_EXTEND(fb->sti->regions_phys[0]);
                else
                        sti_rom_address = F_EXTEND(fb->sti->regions_phys[1]);

                fb->deviceSpecificConfig = gsc_readl(sti_rom_address);
                if (IS_24_DEVICE(fb)) {
                        if (bpp_pref == 8 || bpp_pref == 32)
                                bpp = bpp_pref;
                        else
                                bpp = 32;
                } else
                        bpp = 8;
                READ_WORD(fb, REG_15);
                SETUP_HW(fb);
                break;
        case CRT_ID_VISUALIZE_EG:
        case S9000_ID_ARTIST:   /* Artist */
                break;
        default: 
#ifdef FALLBACK_TO_1BPP
                printk(KERN_WARNING 
                        "stifb: Unsupported graphics card (id=0x%08x) "
                                "- now trying 1bpp mode instead\n",
                        fb->id);
                bpp = 1;        /* default to 1 bpp */
                break;
#else
                printk(KERN_WARNING 
                        "stifb: Unsupported graphics card (id=0x%08x) "
                                "- skipping.\n",
                        fb->id);
                goto out_err0;
#endif
        }


        /* get framebuffer physical and virtual base addr & len (64bit ready) */
        fix->smem_start = F_EXTEND(fb->sti->regions_phys[1]);
        fix->smem_len = fb->sti->regions[1].region_desc.length * 4096;

        fix->line_length = (fb->sti->glob_cfg->total_x * bpp) / 8;
        if (!fix->line_length)
                fix->line_length = 2048; /* default */
        
        /* limit fbsize to max visible screen size */
        if (fix->smem_len > yres*fix->line_length)
                fix->smem_len = yres*fix->line_length;
        
        fix->accel = FB_ACCEL_NONE;

        switch (bpp) {
            case 1:
                fix->type = FB_TYPE_PLANES;     /* well, sort of */
                fix->visual = FB_VISUAL_MONO10;
                var->red.length = var->green.length = var->blue.length = 1;
                break;
            case 8:
                fix->type = FB_TYPE_PACKED_PIXELS;
                fix->visual = FB_VISUAL_PSEUDOCOLOR;
                var->red.length = var->green.length = var->blue.length = 8;
                break;
            case 32:
                fix->type = FB_TYPE_PACKED_PIXELS;
                fix->visual = FB_VISUAL_DIRECTCOLOR;
                var->red.length = var->green.length = var->blue.length = var->transp.length = 8;
                var->blue.offset = 0;
                var->green.offset = 8;
                var->red.offset = 16;
                var->transp.offset = 24;
                break;
            default:
                break;
        }
        
        var->xres = var->xres_virtual = xres;
        var->yres = var->yres_virtual = yres;
        var->bits_per_pixel = bpp;

        strcpy(fix->id, "stifb");
        info->fbops = &stifb_ops;
        info->screen_base = ioremap_nocache(REGION_BASE(fb,1), fix->smem_len);
        info->screen_size = fix->smem_len;
        info->flags = FBINFO_DEFAULT;
        info->pseudo_palette = &fb->pseudo_palette;

        /* This has to be done !!! */
        if (fb_alloc_cmap(&info->cmap, NR_PALETTE, 0))
                goto out_err1;
        stifb_init_display(fb);

        if (!request_mem_region(fix->smem_start, fix->smem_len, "stifb fb")) {
                printk(KERN_ERR "stifb: cannot reserve fb region 0x%04lx-0x%04lx\n",
                                fix->smem_start, fix->smem_start+fix->smem_len);
                goto out_err2;
        }
                
        if (!request_mem_region(fix->mmio_start, fix->mmio_len, "stifb mmio")) {
                printk(KERN_ERR "stifb: cannot reserve sti mmio region 0x%04lx-0x%04lx\n",
                                fix->mmio_start, fix->mmio_start+fix->mmio_len);
                goto out_err3;
        }

        if (register_framebuffer(&fb->info) < 0)
                goto out_err4;

        sti->info = info; /* save for unregister_framebuffer() */

        printk(KERN_INFO 
            "fb%d: %s %dx%d-%d frame buffer device, %s, id: %04x, mmio: 0x%04lx\n",
                fb->info.node, 
                fix->id,
                var->xres, 
                var->yres,
                var->bits_per_pixel,
                dev_name,
                fb->id, 
                fix->mmio_start);

        return 0;


out_err4:
        release_mem_region(fix->mmio_start, fix->mmio_len);
out_err3:
        release_mem_region(fix->smem_start, fix->smem_len);
out_err2:
        fb_dealloc_cmap(&info->cmap);
out_err1:
        iounmap(info->screen_base);
out_err0:
        kfree(fb);
        return -ENXIO;
}

static int stifb_disabled __initdata;

int __init
stifb_setup(char *options);

static int __init stifb_init(void)
{
        struct sti_struct *sti;
        struct sti_struct *def_sti;
        int i;
        
#ifndef MODULE
        char *option = NULL;

        if (fb_get_options("stifb", &option))
                return -ENODEV;
        stifb_setup(option);
#endif
        if (stifb_disabled) {
                printk(KERN_INFO "stifb: disabled by \"stifb=off\" kernel parameter\n");
                return -ENXIO;
        }
        
        def_sti = sti_get_rom(0);
        if (def_sti) {
                for (i = 1; i <= MAX_STI_ROMS; i++) {
                        sti = sti_get_rom(i);
                        if (!sti)
                                break;
                        if (sti == def_sti) {
                                stifb_init_fb(sti, stifb_bpp_pref[i - 1]);
                                break;
                        }
                }
        }

        for (i = 1; i <= MAX_STI_ROMS; i++) {
                sti = sti_get_rom(i);
                if (!sti)
                        break;
                if (sti == def_sti)
                        continue;
                stifb_init_fb(sti, stifb_bpp_pref[i - 1]);
        }
        return 0;
}

/*
 *  Cleanup
 */

static void __exit
stifb_cleanup(void)
{
        struct sti_struct *sti;
        int i;
        
        for (i = 1; i <= MAX_STI_ROMS; i++) {
                sti = sti_get_rom(i);
                if (!sti)
                        break;
                if (sti->info) {
                        struct fb_info *info = sti->info;
                        unregister_framebuffer(sti->info);
                        release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
                        release_mem_region(info->fix.smem_start, info->fix.smem_len);
                                if (info->screen_base)
                                        iounmap(info->screen_base);
                        fb_dealloc_cmap(&info->cmap);
                        framebuffer_release(info);
                }
                sti->info = NULL;
        }
}

int __init
stifb_setup(char *options)
{
        int i;
        
        if (!options || !*options)
                return 1;
        
        if (strncmp(options, "off", 3) == 0) {
                stifb_disabled = 1;
                options += 3;
        }

        if (strncmp(options, "bpp", 3) == 0) {
                options += 3;
                for (i = 0; i < MAX_STI_ROMS; i++) {
                        if (*options++ != ':')
                                break;
                        stifb_bpp_pref[i] = simple_strtoul(options, &options, 10);
                }
        }
        return 1;
}

__setup("stifb=", stifb_setup);

module_init(stifb_init);
module_exit(stifb_cleanup);

MODULE_AUTHOR("Helge Deller <deller@gmx.de>, Thomas Bogendoerfer <tsbogend@alpha.franken.de>");
MODULE_DESCRIPTION("Framebuffer driver for HP's NGLE series graphics cards in HP PARISC machines");
MODULE_LICENSE("GPL v2");