// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * macfb.c: Generic framebuffer for Macs whose colourmaps/modes we
 * don't know how to set.
 *
 * (c) 1999 David Huggins-Daines <dhd@debian.org>
 *
 * Primarily based on vesafb.c, by Gerd Knorr
 * (c) 1998 Gerd Knorr <kraxel@cs.tu-berlin.de>
 *
 * Also uses information and code from:
 *
 * The original macfb.c from Linux/mac68k 2.0, by Alan Cox, Juergen
 * Mellinger, Mikael Forselius, Michael Schmitz, and others.
 *
 * valkyriefb.c, by Martin Costabel, Kevin Schoedel, Barry Nathan, Dan
 * Jacobowitz, Paul Mackerras, Fabio Riccardi, and Geert Uytterhoeven.
 *
 * The VideoToolbox "Bugs" web page at
 * http://rajsky.psych.nyu.edu/Tips/VideoBugs.html
 */

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

#include <asm/setup.h>
#include <asm/macintosh.h>
#include <asm/io.h>

/* Common DAC base address for the LC, RBV, Valkyrie, and IIvx */
#define DAC_BASE 0x50f24000

/* Some addresses for the DAFB */
#define DAFB_BASE 0xf9800200

/* Address for the built-in Civic framebuffer in Quadra AVs */
#define CIVIC_BASE 0x50f30800

/* GSC (Gray Scale Controller) base address */
#define GSC_BASE 0x50F20000

/* CSC (Color Screen Controller) base address */
#define CSC_BASE 0x50F20000

static int (*macfb_setpalette)(unsigned int regno, unsigned int red,
                               unsigned int green, unsigned int blue,
                               struct fb_info *info);

static struct {
        unsigned char addr;
        unsigned char lut;
} __iomem *v8_brazil_cmap_regs;

static struct {
        unsigned char addr;
        char pad1[3]; /* word aligned */
        unsigned char lut;
        char pad2[3]; /* word aligned */
        unsigned char cntl; /* a guess as to purpose */
} __iomem *rbv_cmap_regs;

static struct {
        unsigned long reset;
        unsigned long pad1[3];
        unsigned char pad2[3];
        unsigned char lut;
} __iomem *dafb_cmap_regs;

static struct {
        unsigned char addr;     /* OFFSET: 0x00 */
        unsigned char pad1[15];
        unsigned char lut;      /* OFFSET: 0x10 */
        unsigned char pad2[15];
        unsigned char status;   /* OFFSET: 0x20 */
        unsigned char pad3[7];
        unsigned long vbl_addr; /* OFFSET: 0x28 */
        unsigned int  status2;  /* OFFSET: 0x2C */
} __iomem *civic_cmap_regs;

static struct {
        char pad1[0x40];
        unsigned char clut_waddr;       /* 0x40 */
        char pad2;
        unsigned char clut_data;        /* 0x42 */
        char pad3[0x3];
        unsigned char clut_raddr;       /* 0x46 */
} __iomem *csc_cmap_regs;

/* The registers in these structs are in NuBus slot space */
struct mdc_cmap_regs {
        char pad1[0x200200];
        unsigned char addr;
        char pad2[6];
        unsigned char lut;
};

struct toby_cmap_regs {
        char pad1[0x90018];
        unsigned char lut; /* TFBClutWDataReg, offset 0x90018 */
        char pad2[3];
        unsigned char addr; /* TFBClutAddrReg, offset 0x9001C */
};

struct jet_cmap_regs {
        char pad1[0xe0e000];
        unsigned char addr;
        unsigned char lut;
};

#define PIXEL_TO_MM(a)  (((a)*10)/28)   /* width in mm at 72 dpi */

static struct fb_var_screeninfo macfb_defined = {
        .activate       = FB_ACTIVATE_NOW,
        .right_margin   = 32,
        .upper_margin   = 16,
        .lower_margin   = 4,
        .vsync_len      = 4,
        .vmode          = FB_VMODE_NONINTERLACED,
};

static struct fb_fix_screeninfo macfb_fix = {
        .type   = FB_TYPE_PACKED_PIXELS,
        .accel  = FB_ACCEL_NONE,
};

static void *slot_addr;
static struct fb_info fb_info;
static u32 pseudo_palette[16];
static int vidtest;

/*
 * Unlike the Valkyrie, the DAFB cannot set individual colormap
 * registers.  Therefore, we do what the MacOS driver does (no
 * kidding!) and simply set them one by one until we hit the one we
 * want.
 */
static int dafb_setpalette(unsigned int regno, unsigned int red,
                           unsigned int green, unsigned int blue,
                           struct fb_info *info)
{
        static int lastreg = -2;
        unsigned long flags;

        local_irq_save(flags);

        /*
         * fbdev will set an entire colourmap, but X won't.  Hopefully
         * this should accommodate both of them
         */
        if (regno != lastreg + 1) {
                int i;

                /* Stab in the dark trying to reset the CLUT pointer */
                nubus_writel(0, &dafb_cmap_regs->reset);
                nop();

                /* Loop until we get to the register we want */
                for (i = 0; i < regno; i++) {
                        nubus_writeb(info->cmap.red[i] >> 8,
                                     &dafb_cmap_regs->lut);
                        nop();
                        nubus_writeb(info->cmap.green[i] >> 8,
                                     &dafb_cmap_regs->lut);
                        nop();
                        nubus_writeb(info->cmap.blue[i] >> 8,
                                     &dafb_cmap_regs->lut);
                        nop();
                }
        }

        nubus_writeb(red, &dafb_cmap_regs->lut);
        nop();
        nubus_writeb(green, &dafb_cmap_regs->lut);
        nop();
        nubus_writeb(blue, &dafb_cmap_regs->lut);

        local_irq_restore(flags);
        lastreg = regno;
        return 0;
}

/* V8 and Brazil seem to use the same DAC.  Sonora does as well. */
static int v8_brazil_setpalette(unsigned int regno, unsigned int red,
                                unsigned int green, unsigned int blue,
                                struct fb_info *info)
{
        unsigned int bpp = info->var.bits_per_pixel;
        unsigned long flags;

        local_irq_save(flags);

        /* On these chips, the CLUT register numbers are spread out
         * across the register space.  Thus:
         * In 8bpp, all regnos are valid.
         * In 4bpp, the regnos are 0x0f, 0x1f, 0x2f, etc, etc
         * In 2bpp, the regnos are 0x3f, 0x7f, 0xbf, 0xff
         */
        regno = (regno << (8 - bpp)) | (0xFF >> bpp);
        nubus_writeb(regno, &v8_brazil_cmap_regs->addr);
        nop();

        /* send one color channel at a time */
        nubus_writeb(red, &v8_brazil_cmap_regs->lut);
        nop();
        nubus_writeb(green, &v8_brazil_cmap_regs->lut);
        nop();
        nubus_writeb(blue, &v8_brazil_cmap_regs->lut);

        local_irq_restore(flags);
        return 0;
}

/* RAM-Based Video */
static int rbv_setpalette(unsigned int regno, unsigned int red,
                          unsigned int green, unsigned int blue,
                          struct fb_info *info)
{
        unsigned long flags;

        local_irq_save(flags);

        /* From the VideoToolbox driver.  Seems to be saying that
         * regno #254 and #255 are the important ones for 1-bit color,
         * regno #252-255 are the important ones for 2-bit color, etc.
         */
        regno += 256 - (1 << info->var.bits_per_pixel);

        /* reset clut? (VideoToolbox sez "not necessary") */
        nubus_writeb(0xFF, &rbv_cmap_regs->cntl);
        nop();

        /* tell clut which address to use. */
        nubus_writeb(regno, &rbv_cmap_regs->addr);
        nop();

        /* send one color channel at a time. */
        nubus_writeb(red, &rbv_cmap_regs->lut);
        nop();
        nubus_writeb(green, &rbv_cmap_regs->lut);
        nop();
        nubus_writeb(blue, &rbv_cmap_regs->lut);

        local_irq_restore(flags);
        return 0;
}

/* Macintosh Display Card (8*24) */
static int mdc_setpalette(unsigned int regno, unsigned int red,
                          unsigned int green, unsigned int blue,
                          struct fb_info *info)
{
        struct mdc_cmap_regs *cmap_regs = slot_addr;
        unsigned long flags;

        local_irq_save(flags);

        /* the nop's are there to order writes. */
        nubus_writeb(regno, &cmap_regs->addr);
        nop();
        nubus_writeb(red, &cmap_regs->lut);
        nop();
        nubus_writeb(green, &cmap_regs->lut);
        nop();
        nubus_writeb(blue, &cmap_regs->lut);

        local_irq_restore(flags);
        return 0;
}

/* Toby frame buffer */
static int toby_setpalette(unsigned int regno, unsigned int red,
                           unsigned int green, unsigned int blue,
                           struct fb_info *info)
{
        struct toby_cmap_regs *cmap_regs = slot_addr;
        unsigned int bpp = info->var.bits_per_pixel;
        unsigned long flags;

        red = ~red;
        green = ~green;
        blue = ~blue;
        regno = (regno << (8 - bpp)) | (0xFF >> bpp);

        local_irq_save(flags);

        nubus_writeb(regno, &cmap_regs->addr);
        nop();
        nubus_writeb(red, &cmap_regs->lut);
        nop();
        nubus_writeb(green, &cmap_regs->lut);
        nop();
        nubus_writeb(blue, &cmap_regs->lut);

        local_irq_restore(flags);
        return 0;
}

/* Jet frame buffer */
static int jet_setpalette(unsigned int regno, unsigned int red,
                          unsigned int green, unsigned int blue,
                          struct fb_info *info)
{
        struct jet_cmap_regs *cmap_regs = slot_addr;
        unsigned long flags;

        local_irq_save(flags);

        nubus_writeb(regno, &cmap_regs->addr);
        nop();
        nubus_writeb(red, &cmap_regs->lut);
        nop();
        nubus_writeb(green, &cmap_regs->lut);
        nop();
        nubus_writeb(blue, &cmap_regs->lut);

        local_irq_restore(flags);
        return 0;
}

/*
 * Civic framebuffer -- Quadra AV built-in video.  A chip
 * called Sebastian holds the actual color palettes, and
 * apparently, there are two different banks of 512K RAM
 * which can act as separate framebuffers for doing video
 * input and viewing the screen at the same time!  The 840AV
 * Can add another 1MB RAM to give the two framebuffers
 * 1MB RAM apiece.
 */
static int civic_setpalette(unsigned int regno, unsigned int red,
                            unsigned int green, unsigned int blue,
                            struct fb_info *info)
{
        unsigned long flags;
        int clut_status;
        
        local_irq_save(flags);

        /* Set the register address */
        nubus_writeb(regno, &civic_cmap_regs->addr);
        nop();

        /*
         * Grab a status word and do some checking;
         * Then finally write the clut!
         */
        clut_status =  nubus_readb(&civic_cmap_regs->status2);

        if ((clut_status & 0x0008) == 0)
        {
#if 0
                if ((clut_status & 0x000D) != 0)
                {
                        nubus_writeb(0x00, &civic_cmap_regs->lut);
                        nop();
                        nubus_writeb(0x00, &civic_cmap_regs->lut);
                        nop();
                }
#endif

                nubus_writeb(red, &civic_cmap_regs->lut);
                nop();
                nubus_writeb(green, &civic_cmap_regs->lut);
                nop();
                nubus_writeb(blue, &civic_cmap_regs->lut);
                nop();
                nubus_writeb(0x00, &civic_cmap_regs->lut);
        }
        else
        {
                unsigned char junk;

                junk = nubus_readb(&civic_cmap_regs->lut);
                nop();
                junk = nubus_readb(&civic_cmap_regs->lut);
                nop();
                junk = nubus_readb(&civic_cmap_regs->lut);
                nop();
                junk = nubus_readb(&civic_cmap_regs->lut);
                nop();

                if ((clut_status & 0x000D) != 0)
                {
                        nubus_writeb(0x00, &civic_cmap_regs->lut);
                        nop();
                        nubus_writeb(0x00, &civic_cmap_regs->lut);
                        nop();
                }

                nubus_writeb(red, &civic_cmap_regs->lut);
                nop();
                nubus_writeb(green, &civic_cmap_regs->lut);
                nop();
                nubus_writeb(blue, &civic_cmap_regs->lut);
                nop();
                nubus_writeb(junk, &civic_cmap_regs->lut);
        }

        local_irq_restore(flags);
        return 0;
}

/*
 * The CSC is the framebuffer on the PowerBook 190 series
 * (and the 5300 too, but that's a PowerMac). This function
 * brought to you in part by the ECSC driver for MkLinux.
 */
static int csc_setpalette(unsigned int regno, unsigned int red,
                          unsigned int green, unsigned int blue,
                          struct fb_info *info)
{
        unsigned long flags;

        local_irq_save(flags);

        udelay(1); /* mklinux on PB 5300 waits for 260 ns */
        nubus_writeb(regno, &csc_cmap_regs->clut_waddr);
        nubus_writeb(red, &csc_cmap_regs->clut_data);
        nubus_writeb(green, &csc_cmap_regs->clut_data);
        nubus_writeb(blue, &csc_cmap_regs->clut_data);

        local_irq_restore(flags);
        return 0;
}

static int macfb_setcolreg(unsigned regno, unsigned red, unsigned green,
                           unsigned blue, unsigned transp,
                           struct fb_info *fb_info)
{
        /*
         * 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 non-zero for invalid regno.
         */
        
        if (regno >= fb_info->cmap.len)
                return 1;

        if (fb_info->var.bits_per_pixel <= 8) {
                switch (fb_info->var.bits_per_pixel) {
                case 1:
                        /* We shouldn't get here */
                        break;
                case 2:
                case 4:
                case 8:
                        if (macfb_setpalette)
                                macfb_setpalette(regno, red >> 8, green >> 8,
                                                 blue >> 8, fb_info);
                        else
                                return 1;
                        break;
                }
        } else if (regno < 16) {
                switch (fb_info->var.bits_per_pixel) {
                case 16:
                        if (fb_info->var.red.offset == 10) {
                                /* 1:5:5:5 */
                                ((u32*) (fb_info->pseudo_palette))[regno] =
                                        ((red   & 0xf800) >>  1) |
                                        ((green & 0xf800) >>  6) |
                                        ((blue  & 0xf800) >> 11) |
                                        ((transp != 0) << 15);
                        } else {
                                /* 0:5:6:5 */
                                ((u32*) (fb_info->pseudo_palette))[regno] =
                                        ((red   & 0xf800) >>  0) |
                                        ((green & 0xfc00) >>  5) |
                                        ((blue  & 0xf800) >> 11);
                        }
                        break;
                /*
                 * 24-bit colour almost doesn't exist on 68k Macs --
                 * https://support.apple.com/kb/TA28634 (Old Article: 10992)
                 */
                case 24:
                case 32:
                        red   >>= 8;
                        green >>= 8;
                        blue  >>= 8;
                        ((u32 *)(fb_info->pseudo_palette))[regno] =
                                (red   << fb_info->var.red.offset) |
                                (green << fb_info->var.green.offset) |
                                (blue  << fb_info->var.blue.offset);
                        break;
                }
        }

        return 0;
}

static const struct fb_ops macfb_ops = {
        .owner          = THIS_MODULE,
        .fb_setcolreg   = macfb_setcolreg,
        .fb_fillrect    = cfb_fillrect,
        .fb_copyarea    = cfb_copyarea,
        .fb_imageblit   = cfb_imageblit,
};

static void __init macfb_setup(char *options)
{
        char *this_opt;

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

        while ((this_opt = strsep(&options, ",")) != NULL) {
                if (!*this_opt)
                        continue;

                if (!strcmp(this_opt, "inverse"))
                        fb_invert_cmaps();
                else
                        if (!strcmp(this_opt, "vidtest"))
                                vidtest = 1; /* enable experimental CLUT code */
        }
}

static void __init iounmap_macfb(void)
{
        if (dafb_cmap_regs)
                iounmap(dafb_cmap_regs);
        if (v8_brazil_cmap_regs)
                iounmap(v8_brazil_cmap_regs);
        if (rbv_cmap_regs)
                iounmap(rbv_cmap_regs);
        if (civic_cmap_regs)
                iounmap(civic_cmap_regs);
        if (csc_cmap_regs)
                iounmap(csc_cmap_regs);
}

static int __init macfb_init(void)
{
        int video_cmap_len, video_is_nubus = 0;
        struct nubus_rsrc *ndev = NULL;
        char *option = NULL;
        int err;

        if (fb_get_options("macfb", &option))
                return -ENODEV;
        macfb_setup(option);

        if (!MACH_IS_MAC) 
                return -ENODEV;

        if (mac_bi_data.id == MAC_MODEL_Q630 ||
            mac_bi_data.id == MAC_MODEL_P588)
                return -ENODEV; /* See valkyriefb.c */

        macfb_defined.xres = mac_bi_data.dimensions & 0xFFFF;
        macfb_defined.yres = mac_bi_data.dimensions >> 16;
        macfb_defined.bits_per_pixel = mac_bi_data.videodepth;

        macfb_fix.line_length = mac_bi_data.videorow;
        macfb_fix.smem_len    = macfb_fix.line_length * macfb_defined.yres;
        /* Note: physical address (since 2.1.127) */
        macfb_fix.smem_start  = mac_bi_data.videoaddr;

        /*
         * This is actually redundant with the initial mappings.
         * However, there are some non-obvious aspects to the way
         * those mappings are set up, so this is in fact the safest
         * way to ensure that this driver will work on every possible Mac
         */
        fb_info.screen_base = ioremap(mac_bi_data.videoaddr,
                                      macfb_fix.smem_len);
        if (!fb_info.screen_base)
                return -ENODEV;

        pr_info("macfb: framebuffer at 0x%08lx, mapped to 0x%p, size %dk\n",
                macfb_fix.smem_start, fb_info.screen_base,
                macfb_fix.smem_len / 1024);
        pr_info("macfb: mode is %dx%dx%d, linelength=%d\n",
                macfb_defined.xres, macfb_defined.yres,
                macfb_defined.bits_per_pixel, macfb_fix.line_length);

        /* Fill in the available video resolution */
        macfb_defined.xres_virtual = macfb_defined.xres;
        macfb_defined.yres_virtual = macfb_defined.yres;
        macfb_defined.height       = PIXEL_TO_MM(macfb_defined.yres);
        macfb_defined.width        = PIXEL_TO_MM(macfb_defined.xres);

        /* Some dummy values for timing to make fbset happy */
        macfb_defined.pixclock     = 10000000 / macfb_defined.xres *
                                     1000 / macfb_defined.yres;
        macfb_defined.left_margin  = (macfb_defined.xres / 8) & 0xf8;
        macfb_defined.hsync_len    = (macfb_defined.xres / 8) & 0xf8;

        switch (macfb_defined.bits_per_pixel) {
        case 1:
                macfb_defined.red.length = macfb_defined.bits_per_pixel;
                macfb_defined.green.length = macfb_defined.bits_per_pixel;
                macfb_defined.blue.length = macfb_defined.bits_per_pixel;
                video_cmap_len = 2;
                macfb_fix.visual = FB_VISUAL_MONO01;
                break;
        case 2:
        case 4:
        case 8:
                macfb_defined.red.length = macfb_defined.bits_per_pixel;
                macfb_defined.green.length = macfb_defined.bits_per_pixel;
                macfb_defined.blue.length = macfb_defined.bits_per_pixel;
                video_cmap_len = 1 << macfb_defined.bits_per_pixel;
                macfb_fix.visual = FB_VISUAL_PSEUDOCOLOR;
                break;
        case 16:
                macfb_defined.transp.offset = 15;
                macfb_defined.transp.length = 1;
                macfb_defined.red.offset = 10;
                macfb_defined.red.length = 5;
                macfb_defined.green.offset = 5;
                macfb_defined.green.length = 5;
                macfb_defined.blue.offset = 0;
                macfb_defined.blue.length = 5;
                video_cmap_len = 16;
                /*
                 * Should actually be FB_VISUAL_DIRECTCOLOR, but this
                 * works too
                 */
                macfb_fix.visual = FB_VISUAL_TRUECOLOR;
                break;
        case 24:
        case 32:
                macfb_defined.red.offset = 16;
                macfb_defined.red.length = 8;
                macfb_defined.green.offset = 8;
                macfb_defined.green.length = 8;
                macfb_defined.blue.offset = 0;
                macfb_defined.blue.length = 8;
                video_cmap_len = 16;
                macfb_fix.visual = FB_VISUAL_TRUECOLOR;
                break;
        default:
                pr_err("macfb: unknown or unsupported bit depth: %d\n",
                       macfb_defined.bits_per_pixel);
                err = -EINVAL;
                goto fail_unmap;
        }
        
        /*
         * We take a wild guess that if the video physical address is
         * in nubus slot space, that the nubus card is driving video.
         * Penguin really ought to tell us whether we are using internal
         * video or not.
         * Hopefully we only find one of them.  Otherwise our NuBus
         * code is really broken :-)
         */

        for_each_func_rsrc(ndev) {
                unsigned long base = ndev->board->slot_addr;

                if (mac_bi_data.videoaddr < base ||
                    mac_bi_data.videoaddr - base > 0xFFFFFF)
                        continue;

                if (ndev->category != NUBUS_CAT_DISPLAY ||
                    ndev->type != NUBUS_TYPE_VIDEO)
                        continue;

                video_is_nubus = 1;
                slot_addr = (unsigned char *)base;

                switch(ndev->dr_hw) {
                case NUBUS_DRHW_APPLE_MDC:
                        strcpy(macfb_fix.id, "Mac Disp. Card");
                        macfb_setpalette = mdc_setpalette;
                        break;
                case NUBUS_DRHW_APPLE_TFB:
                        strcpy(macfb_fix.id, "Toby");
                        macfb_setpalette = toby_setpalette;
                        break;
                case NUBUS_DRHW_APPLE_JET:
                        strcpy(macfb_fix.id, "Jet");
                        macfb_setpalette = jet_setpalette;
                        break;
                default:
                        strcpy(macfb_fix.id, "Generic NuBus");
                        break;
                }
        }

        /* If it's not a NuBus card, it must be internal video */
        if (!video_is_nubus)
                switch (mac_bi_data.id) {
                /*
                 * DAFB Quadras
                 * Note: these first four have the v7 DAFB, which is
                 * known to be rather unlike the ones used in the
                 * other models
                 */
                case MAC_MODEL_P475:
                case MAC_MODEL_P475F:
                case MAC_MODEL_P575:
                case MAC_MODEL_Q605:

                case MAC_MODEL_Q800:
                case MAC_MODEL_Q650:
                case MAC_MODEL_Q610:
                case MAC_MODEL_C650:
                case MAC_MODEL_C610:
                case MAC_MODEL_Q700:
                case MAC_MODEL_Q900:
                case MAC_MODEL_Q950:
                        strcpy(macfb_fix.id, "DAFB");
                        macfb_setpalette = dafb_setpalette;
                        dafb_cmap_regs = ioremap(DAFB_BASE, 0x1000);
                        break;

                /*
                 * LC II uses the V8 framebuffer
                 */
                case MAC_MODEL_LCII:
                        strcpy(macfb_fix.id, "V8");
                        macfb_setpalette = v8_brazil_setpalette;
                        v8_brazil_cmap_regs = ioremap(DAC_BASE, 0x1000);
                        break;

                /*
                 * IIvi, IIvx use the "Brazil" framebuffer (which is
                 * very much like the V8, it seems, and probably uses
                 * the same DAC)
                 */
                case MAC_MODEL_IIVI:
                case MAC_MODEL_IIVX:
                case MAC_MODEL_P600:
                        strcpy(macfb_fix.id, "Brazil");
                        macfb_setpalette = v8_brazil_setpalette;
                        v8_brazil_cmap_regs = ioremap(DAC_BASE, 0x1000);
                        break;

                /*
                 * LC III (and friends) use the Sonora framebuffer
                 * Incidentally this is also used in the non-AV models
                 * of the x100 PowerMacs
                 * These do in fact seem to use the same DAC interface
                 * as the LC II.
                 */
                case MAC_MODEL_LCIII:
                case MAC_MODEL_P520:
                case MAC_MODEL_P550:
                case MAC_MODEL_P460:
                        strcpy(macfb_fix.id, "Sonora");
                        macfb_setpalette = v8_brazil_setpalette;
                        v8_brazil_cmap_regs = ioremap(DAC_BASE, 0x1000);
                        break;

                /*
                 * IIci and IIsi use the infamous RBV chip
                 * (the IIsi is just a rebadged and crippled
                 * IIci in a different case, BTW)
                 */
                case MAC_MODEL_IICI:
                case MAC_MODEL_IISI:
                        strcpy(macfb_fix.id, "RBV");
                        macfb_setpalette = rbv_setpalette;
                        rbv_cmap_regs = ioremap(DAC_BASE, 0x1000);
                        break;

                /*
                 * AVs use the Civic framebuffer
                 */
                case MAC_MODEL_Q840:
                case MAC_MODEL_C660:
                        strcpy(macfb_fix.id, "Civic");
                        macfb_setpalette = civic_setpalette;
                        civic_cmap_regs = ioremap(CIVIC_BASE, 0x1000);
                        break;

                
                /*
                 * Assorted weirdos
                 * We think this may be like the LC II
                 */
                case MAC_MODEL_LC:
                        strcpy(macfb_fix.id, "LC");
                        if (vidtest) {
                                macfb_setpalette = v8_brazil_setpalette;
                                v8_brazil_cmap_regs =
                                        ioremap(DAC_BASE, 0x1000);
                        }
                        break;

                /*
                 * We think this may be like the LC II
                 */
                case MAC_MODEL_CCL:
                        strcpy(macfb_fix.id, "Color Classic");
                        if (vidtest) {
                                macfb_setpalette = v8_brazil_setpalette;
                                v8_brazil_cmap_regs =
                                        ioremap(DAC_BASE, 0x1000);
                        }
                        break;

                /*
                 * And we *do* mean "weirdos"
                 */
                case MAC_MODEL_TV:
                        strcpy(macfb_fix.id, "Mac TV");
                        break;

                /*
                 * These don't have colour, so no need to worry
                 */
                case MAC_MODEL_SE30:
                case MAC_MODEL_CLII:
                        strcpy(macfb_fix.id, "Monochrome");
                        break;

                /*
                 * Powerbooks are particularly difficult.  Many of
                 * them have separate framebuffers for external and
                 * internal video, which is admittedly pretty cool,
                 * but will be a bit of a headache to support here.
                 * Also, many of them are grayscale, and we don't
                 * really support that.
                 */

                /*
                 * Slot 0 ROM says TIM. No external video. B&W.
                 */
                case MAC_MODEL_PB140:
                case MAC_MODEL_PB145:
                case MAC_MODEL_PB170:
                        strcpy(macfb_fix.id, "DDC");
                        break;

                /*
                 * Internal is GSC, External (if present) is ViSC
                 */
                case MAC_MODEL_PB150:   /* no external video */
                case MAC_MODEL_PB160:
                case MAC_MODEL_PB165:
                case MAC_MODEL_PB180:
                case MAC_MODEL_PB210:
                case MAC_MODEL_PB230:
                        strcpy(macfb_fix.id, "GSC");
                        break;

                /*
                 * Internal is TIM, External is ViSC
                 */
                case MAC_MODEL_PB165C:
                case MAC_MODEL_PB180C:
                        strcpy(macfb_fix.id, "TIM");
                        break;

                /*
                 * Internal is CSC, External is Keystone+Ariel.
                 */
                case MAC_MODEL_PB190:   /* external video is optional */
                case MAC_MODEL_PB520:
                case MAC_MODEL_PB250:
                case MAC_MODEL_PB270C:
                case MAC_MODEL_PB280:
                case MAC_MODEL_PB280C:
                        strcpy(macfb_fix.id, "CSC");
                        macfb_setpalette = csc_setpalette;
                        csc_cmap_regs = ioremap(CSC_BASE, 0x1000);
                        break;

                default:
                        strcpy(macfb_fix.id, "Unknown");
                        break;
                }

        fb_info.fbops           = &macfb_ops;
        fb_info.var             = macfb_defined;
        fb_info.fix             = macfb_fix;
        fb_info.pseudo_palette  = pseudo_palette;
        fb_info.flags           = FBINFO_DEFAULT;

        err = fb_alloc_cmap(&fb_info.cmap, video_cmap_len, 0);
        if (err)
                goto fail_unmap;

        err = register_framebuffer(&fb_info);
        if (err)
                goto fail_dealloc;

        fb_info(&fb_info, "%s frame buffer device\n", fb_info.fix.id);

        return 0;

fail_dealloc:
        fb_dealloc_cmap(&fb_info.cmap);
fail_unmap:
        iounmap(fb_info.screen_base);
        iounmap_macfb();
        return err;
}

module_init(macfb_init);
MODULE_LICENSE("GPL");