/*
 *  linux/drivers/video/offb.c -- Open Firmware based frame buffer device
 *
 *      Copyright (C) 1997 Geert Uytterhoeven
 *
 *  This driver is partly based on the PowerMac console driver:
 *
 *      Copyright (C) 1996 Paul Mackerras
 *
 *  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.
 */

#include <linux/aperture.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <asm/io.h>

#ifdef CONFIG_PPC32
#include <asm/bootx.h>
#endif

#include "macmodes.h"

/* Supported palette hacks */
enum {
        cmap_unknown,
        cmap_simple,            /* ATI Mach64 */
        cmap_r128,              /* ATI Rage128 */
        cmap_M3A,               /* ATI Rage Mobility M3 Head A */
        cmap_M3B,               /* ATI Rage Mobility M3 Head B */
        cmap_radeon,            /* ATI Radeon */
        cmap_gxt2000,           /* IBM GXT2000 */
        cmap_avivo,             /* ATI R5xx */
        cmap_qemu,              /* qemu vga */
};

struct offb_par {
        volatile void __iomem *cmap_adr;
        volatile void __iomem *cmap_data;
        int cmap_type;
        int blanked;
        u32 pseudo_palette[16];
        resource_size_t base;
        resource_size_t size;
};

#ifdef CONFIG_PPC32
extern boot_infos_t *boot_infos;
#endif

/* Definitions used by the Avivo palette hack */
#define AVIVO_DC_LUT_RW_SELECT                  0x6480
#define AVIVO_DC_LUT_RW_MODE                    0x6484
#define AVIVO_DC_LUT_RW_INDEX                   0x6488
#define AVIVO_DC_LUT_SEQ_COLOR                  0x648c
#define AVIVO_DC_LUT_PWL_DATA                   0x6490
#define AVIVO_DC_LUT_30_COLOR                   0x6494
#define AVIVO_DC_LUT_READ_PIPE_SELECT           0x6498
#define AVIVO_DC_LUT_WRITE_EN_MASK              0x649c
#define AVIVO_DC_LUT_AUTOFILL                   0x64a0

#define AVIVO_DC_LUTA_CONTROL                   0x64c0
#define AVIVO_DC_LUTA_BLACK_OFFSET_BLUE         0x64c4
#define AVIVO_DC_LUTA_BLACK_OFFSET_GREEN        0x64c8
#define AVIVO_DC_LUTA_BLACK_OFFSET_RED          0x64cc
#define AVIVO_DC_LUTA_WHITE_OFFSET_BLUE         0x64d0
#define AVIVO_DC_LUTA_WHITE_OFFSET_GREEN        0x64d4
#define AVIVO_DC_LUTA_WHITE_OFFSET_RED          0x64d8

#define AVIVO_DC_LUTB_CONTROL                   0x6cc0
#define AVIVO_DC_LUTB_BLACK_OFFSET_BLUE         0x6cc4
#define AVIVO_DC_LUTB_BLACK_OFFSET_GREEN        0x6cc8
#define AVIVO_DC_LUTB_BLACK_OFFSET_RED          0x6ccc
#define AVIVO_DC_LUTB_WHITE_OFFSET_BLUE         0x6cd0
#define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN        0x6cd4
#define AVIVO_DC_LUTB_WHITE_OFFSET_RED          0x6cd8

    /*
     *  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 offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
                          u_int transp, struct fb_info *info)
{
        struct offb_par *par = (struct offb_par *) info->par;

        if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
                u32 *pal = info->pseudo_palette;
                u32 cr = red >> (16 - info->var.red.length);
                u32 cg = green >> (16 - info->var.green.length);
                u32 cb = blue >> (16 - info->var.blue.length);
                u32 value;

                if (regno >= 16)
                        return -EINVAL;

                value = (cr << info->var.red.offset) |
                        (cg << info->var.green.offset) |
                        (cb << info->var.blue.offset);
                if (info->var.transp.length > 0) {
                        u32 mask = (1 << info->var.transp.length) - 1;
                        mask <<= info->var.transp.offset;
                        value |= mask;
                }
                pal[regno] = value;
                return 0;
        }

        if (regno > 255)
                return -EINVAL;

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

        if (!par->cmap_adr)
                return 0;

        switch (par->cmap_type) {
        case cmap_simple:
                writeb(regno, par->cmap_adr);
                writeb(red, par->cmap_data);
                writeb(green, par->cmap_data);
                writeb(blue, par->cmap_data);
                break;
        case cmap_M3A:
                /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
                out_le32(par->cmap_adr + 0x58,
                         in_le32(par->cmap_adr + 0x58) & ~0x20);
                fallthrough;
        case cmap_r128:
                /* Set palette index & data */
                out_8(par->cmap_adr + 0xb0, regno);
                out_le32(par->cmap_adr + 0xb4,
                         (red << 16 | green << 8 | blue));
                break;
        case cmap_M3B:
                /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
                out_le32(par->cmap_adr + 0x58,
                         in_le32(par->cmap_adr + 0x58) | 0x20);
                /* Set palette index & data */
                out_8(par->cmap_adr + 0xb0, regno);
                out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
                break;
        case cmap_radeon:
                /* Set palette index & data (could be smarter) */
                out_8(par->cmap_adr + 0xb0, regno);
                out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
                break;
        case cmap_gxt2000:
                out_le32(((unsigned __iomem *) par->cmap_adr) + regno,
                         (red << 16 | green << 8 | blue));
                break;
        case cmap_avivo:
                /* Write to both LUTs for now */
                writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
                writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
                writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
                       par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
                writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
                writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
                writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
                       par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
                break;
        }

        return 0;
}

    /*
     *  Blank the display.
     */

static int offb_blank(int blank, struct fb_info *info)
{
        struct offb_par *par = (struct offb_par *) info->par;
        int i, j;

        if (!par->cmap_adr)
                return 0;

        if (!par->blanked)
                if (!blank)
                        return 0;

        par->blanked = blank;

        if (blank)
                for (i = 0; i < 256; i++) {
                        switch (par->cmap_type) {
                        case cmap_simple:
                                writeb(i, par->cmap_adr);
                                for (j = 0; j < 3; j++)
                                        writeb(0, par->cmap_data);
                                break;
                        case cmap_M3A:
                                /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
                                out_le32(par->cmap_adr + 0x58,
                                         in_le32(par->cmap_adr + 0x58) & ~0x20);
                                fallthrough;
                        case cmap_r128:
                                /* Set palette index & data */
                                out_8(par->cmap_adr + 0xb0, i);
                                out_le32(par->cmap_adr + 0xb4, 0);
                                break;
                        case cmap_M3B:
                                /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
                                out_le32(par->cmap_adr + 0x58,
                                         in_le32(par->cmap_adr + 0x58) | 0x20);
                                /* Set palette index & data */
                                out_8(par->cmap_adr + 0xb0, i);
                                out_le32(par->cmap_adr + 0xb4, 0);
                                break;
                        case cmap_radeon:
                                out_8(par->cmap_adr + 0xb0, i);
                                out_le32(par->cmap_adr + 0xb4, 0);
                                break;
                        case cmap_gxt2000:
                                out_le32(((unsigned __iomem *) par->cmap_adr) + i,
                                         0);
                                break;
                        case cmap_avivo:
                                writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
                                writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
                                writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
                                writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
                                writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
                                writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
                                break;
                        }
        } else
                fb_set_cmap(&info->cmap, info);
        return 0;
}

static int offb_set_par(struct fb_info *info)
{
        struct offb_par *par = (struct offb_par *) info->par;

        /* On avivo, initialize palette control */
        if (par->cmap_type == cmap_avivo) {
                writel(0, par->cmap_adr + AVIVO_DC_LUTA_CONTROL);
                writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_BLUE);
                writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_GREEN);
                writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_RED);
                writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_BLUE);
                writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_GREEN);
                writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_RED);
                writel(0, par->cmap_adr + AVIVO_DC_LUTB_CONTROL);
                writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_BLUE);
                writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_GREEN);
                writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_RED);
                writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_BLUE);
                writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_GREEN);
                writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_RED);
                writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
                writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
                writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
                writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
                writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
                writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
        }
        return 0;
}

static void offb_destroy(struct fb_info *info)
{
        struct offb_par *par = info->par;

        if (info->screen_base)
                iounmap(info->screen_base);
        release_mem_region(par->base, par->size);
        fb_dealloc_cmap(&info->cmap);
        framebuffer_release(info);
}

static const struct fb_ops offb_ops = {
        .owner          = THIS_MODULE,
        FB_DEFAULT_IOMEM_OPS,
        .fb_destroy     = offb_destroy,
        .fb_setcolreg   = offb_setcolreg,
        .fb_set_par     = offb_set_par,
        .fb_blank       = offb_blank,
};

static void __iomem *offb_map_reg(struct device_node *np, int index,
                                  unsigned long offset, unsigned long size)
{
        const __be32 *addrp;
        u64 asize, taddr;
        unsigned int flags;

        addrp = of_get_pci_address(np, index, &asize, &flags);
        if (addrp == NULL)
                addrp = of_get_address(np, index, &asize, &flags);
        if (addrp == NULL)
                return NULL;
        if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
                return NULL;
        if ((offset + size) > asize)
                return NULL;
        taddr = of_translate_address(np, addrp);
        if (taddr == OF_BAD_ADDR)
                return NULL;
        return ioremap(taddr + offset, size);
}

static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp,
                                    unsigned long address)
{
        struct offb_par *par = (struct offb_par *) info->par;

        if (of_node_name_prefix(dp, "ATY,Rage128")) {
                par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
                if (par->cmap_adr)
                        par->cmap_type = cmap_r128;
        } else if (of_node_name_prefix(dp, "ATY,RageM3pA") ||
                   of_node_name_prefix(dp, "ATY,RageM3p12A")) {
                par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
                if (par->cmap_adr)
                        par->cmap_type = cmap_M3A;
        } else if (of_node_name_prefix(dp, "ATY,RageM3pB")) {
                par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
                if (par->cmap_adr)
                        par->cmap_type = cmap_M3B;
        } else if (of_node_name_prefix(dp, "ATY,Rage6")) {
                par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff);
                if (par->cmap_adr)
                        par->cmap_type = cmap_radeon;
        } else if (of_node_name_prefix(dp, "ATY,")) {
                unsigned long base = address & 0xff000000UL;
                par->cmap_adr =
                        ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
                par->cmap_data = par->cmap_adr + 1;
                par->cmap_type = cmap_simple;
        } else if (dp && (of_device_is_compatible(dp, "pci1014,b7") ||
                          of_device_is_compatible(dp, "pci1014,21c"))) {
                par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000);
                if (par->cmap_adr)
                        par->cmap_type = cmap_gxt2000;
        } else if (of_node_name_prefix(dp, "vga,Display-")) {
                /* Look for AVIVO initialized by SLOF */
                struct device_node *pciparent __free(device_node) = of_get_parent(dp);
                const u32 *vid, *did;
                vid = of_get_property(pciparent, "vendor-id", NULL);
                did = of_get_property(pciparent, "device-id", NULL);
                /* This will match most R5xx */
                if (vid && did && *vid == 0x1002 &&
                    ((*did >= 0x7100 && *did < 0x7800) ||
                     (*did >= 0x9400))) {
                        par->cmap_adr = offb_map_reg(pciparent, 2, 0, 0x10000);
                        if (par->cmap_adr)
                                par->cmap_type = cmap_avivo;
                }
        } else if (dp && of_device_is_compatible(dp, "qemu,std-vga")) {
#ifdef __BIG_ENDIAN
                const __be32 io_of_addr[3] = { 0x01000000, 0x0, 0x0 };
#else
                const __be32 io_of_addr[3] = { 0x00000001, 0x0, 0x0 };
#endif
                u64 io_addr = of_translate_address(dp, io_of_addr);
                if (io_addr != OF_BAD_ADDR) {
                        par->cmap_adr = ioremap(io_addr + 0x3c8, 2);
                        if (par->cmap_adr) {
                                par->cmap_type = cmap_simple;
                                par->cmap_data = par->cmap_adr + 1;
                        }
                }
        }
        info->fix.visual = (par->cmap_type != cmap_unknown) ?
                FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
}

static void offb_init_fb(struct platform_device *parent, const char *name,
                         int width, int height, int depth,
                         int pitch, unsigned long address,
                         int foreign_endian, struct device_node *dp)
{
        unsigned long res_size = pitch * height;
        unsigned long res_start = address;
        struct fb_fix_screeninfo *fix;
        struct fb_var_screeninfo *var;
        struct fb_info *info;
        struct offb_par *par;

        if (!request_mem_region(res_start, res_size, "offb"))
                return;

        printk(KERN_INFO
               "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
               width, height, name, address, depth, pitch);
        if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
                printk(KERN_ERR "%pOF: can't use depth = %d\n", dp, depth);
                release_mem_region(res_start, res_size);
                return;
        }

        info = framebuffer_alloc(sizeof(*par), &parent->dev);
        if (!info) {
                release_mem_region(res_start, res_size);
                return;
        }
        platform_set_drvdata(parent, info);
        par = info->par;
        fix = &info->fix;
        var = &info->var;

        if (name)
                snprintf(fix->id, sizeof(fix->id), "OFfb %s", name);
        else
                snprintf(fix->id, sizeof(fix->id), "OFfb %pOFn", dp);


        var->xres = var->xres_virtual = width;
        var->yres = var->yres_virtual = height;
        fix->line_length = pitch;

        fix->smem_start = address;
        fix->smem_len = pitch * height;
        fix->type = FB_TYPE_PACKED_PIXELS;
        fix->type_aux = 0;

        par->cmap_type = cmap_unknown;
        if (depth == 8)
                offb_init_palette_hacks(info, dp, address);
        else
                fix->visual = FB_VISUAL_TRUECOLOR;

        var->xoffset = var->yoffset = 0;
        switch (depth) {
        case 8:
                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 15:                /* RGB 555 */
                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 16:                /* RGB 565 */
                var->bits_per_pixel = 16;
                var->red.offset = 11;
                var->red.length = 5;
                var->green.offset = 5;
                var->green.length = 6;
                var->blue.offset = 0;
                var->blue.length = 5;
                var->transp.offset = 0;
                var->transp.length = 0;
                break;
        case 32:                /* RGB 888 */
                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;
        }
        var->red.msb_right = var->green.msb_right = var->blue.msb_right =
            var->transp.msb_right = 0;
        var->grayscale = 0;
        var->nonstd = 0;
        var->activate = 0;
        var->height = var->width = -1;
        var->pixclock = 10000;
        var->left_margin = var->right_margin = 16;
        var->upper_margin = var->lower_margin = 16;
        var->hsync_len = var->vsync_len = 8;
        var->sync = 0;
        var->vmode = FB_VMODE_NONINTERLACED;

        par->base = address;
        par->size = fix->smem_len;

        info->fbops = &offb_ops;
        info->screen_base = ioremap(address, fix->smem_len);
        info->pseudo_palette = par->pseudo_palette;
        info->flags = foreign_endian;

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

        if (devm_aperture_acquire_for_platform_device(parent, par->base, par->size) < 0)
                goto out_err;
        if (register_framebuffer(info) < 0)
                goto out_err;

        fb_info(info, "Open Firmware frame buffer device on %pOF\n", dp);
        return;

out_err:
        fb_dealloc_cmap(&info->cmap);
        iounmap(info->screen_base);
        iounmap(par->cmap_adr);
        par->cmap_adr = NULL;
        framebuffer_release(info);
        release_mem_region(res_start, res_size);
}


static void offb_init_nodriver(struct platform_device *parent, struct device_node *dp,
                               int no_real_node)
{
        unsigned int len;
        int i, width = 640, height = 480, depth = 8, pitch = 640;
        unsigned int flags, rsize, addr_prop = 0;
        unsigned long max_size = 0;
        u64 rstart, address = OF_BAD_ADDR;
        const __be32 *pp, *addrp, *up;
        u64 asize;
        int foreign_endian = 0;

#ifdef __BIG_ENDIAN
        if (of_property_read_bool(dp, "little-endian"))
                foreign_endian = FBINFO_FOREIGN_ENDIAN;
#else
        if (of_property_read_bool(dp, "big-endian"))
                foreign_endian = FBINFO_FOREIGN_ENDIAN;
#endif

        pp = of_get_property(dp, "linux,bootx-depth", &len);
        if (pp == NULL)
                pp = of_get_property(dp, "depth", &len);
        if (pp && len == sizeof(u32))
                depth = be32_to_cpup(pp);

        pp = of_get_property(dp, "linux,bootx-width", &len);
        if (pp == NULL)
                pp = of_get_property(dp, "width", &len);
        if (pp && len == sizeof(u32))
                width = be32_to_cpup(pp);

        pp = of_get_property(dp, "linux,bootx-height", &len);
        if (pp == NULL)
                pp = of_get_property(dp, "height", &len);
        if (pp && len == sizeof(u32))
                height = be32_to_cpup(pp);

        pp = of_get_property(dp, "linux,bootx-linebytes", &len);
        if (pp == NULL)
                pp = of_get_property(dp, "linebytes", &len);
        if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
                pitch = be32_to_cpup(pp);
        else
                pitch = width * ((depth + 7) / 8);

        rsize = (unsigned long)pitch * (unsigned long)height;

        /* Ok, now we try to figure out the address of the framebuffer.
         *
         * Unfortunately, Open Firmware doesn't provide a standard way to do
         * so. All we can do is a dodgy heuristic that happens to work in
         * practice. On most machines, the "address" property contains what
         * we need, though not on Matrox cards found in IBM machines. What I've
         * found that appears to give good results is to go through the PCI
         * ranges and pick one that is both big enough and if possible encloses
         * the "address" property. If none match, we pick the biggest
         */
        up = of_get_property(dp, "linux,bootx-addr", &len);
        if (up == NULL)
                up = of_get_property(dp, "address", &len);
        if (up && len == sizeof(u32))
                addr_prop = *up;

        /* Hack for when BootX is passing us */
        if (no_real_node)
                goto skip_addr;

        for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
                     != NULL; i++) {
                int match_addrp = 0;

                if (!(flags & IORESOURCE_MEM))
                        continue;
                if (asize < rsize)
                        continue;
                rstart = of_translate_address(dp, addrp);
                if (rstart == OF_BAD_ADDR)
                        continue;
                if (addr_prop && (rstart <= addr_prop) &&
                    ((rstart + asize) >= (addr_prop + rsize)))
                        match_addrp = 1;
                if (match_addrp) {
                        address = addr_prop;
                        break;
                }
                if (rsize > max_size) {
                        max_size = rsize;
                        address = OF_BAD_ADDR;
                }

                if (address == OF_BAD_ADDR)
                        address = rstart;
        }
 skip_addr:
        if (address == OF_BAD_ADDR && addr_prop)
                address = (u64)addr_prop;
        if (address != OF_BAD_ADDR) {
#ifdef CONFIG_PCI
                const __be32 *vidp, *didp;
                u32 vid, did;
                struct pci_dev *pdev;

                vidp = of_get_property(dp, "vendor-id", NULL);
                didp = of_get_property(dp, "device-id", NULL);
                if (vidp && didp) {
                        vid = be32_to_cpup(vidp);
                        did = be32_to_cpup(didp);
                        pdev = pci_get_device(vid, did, NULL);
                        if (!pdev || pci_enable_device(pdev))
                                return;
                }
#endif
                /* kludge for valkyrie */
                if (of_node_name_eq(dp, "valkyrie"))
                        address += 0x1000;
                offb_init_fb(parent, no_real_node ? "bootx" : NULL,
                             width, height, depth, pitch, address,
                             foreign_endian, no_real_node ? NULL : dp);
        }
}

static void offb_remove(struct platform_device *pdev)
{
        struct fb_info *info = platform_get_drvdata(pdev);

        if (info)
                unregister_framebuffer(info);
}

static int offb_probe_bootx_noscreen(struct platform_device *pdev)
{
        offb_init_nodriver(pdev, of_chosen, 1);

        return 0;
}

static struct platform_driver offb_driver_bootx_noscreen = {
        .driver = {
                .name = "bootx-noscreen",
        },
        .probe = offb_probe_bootx_noscreen,
        .remove = offb_remove,
};

static int offb_probe_display(struct platform_device *pdev)
{
        offb_init_nodriver(pdev, pdev->dev.of_node, 0);

        return 0;
}

static const struct of_device_id offb_of_match_display[] = {
        { .compatible = "display", },
        { },
};
MODULE_DEVICE_TABLE(of, offb_of_match_display);

static struct platform_driver offb_driver_display = {
        .driver = {
                .name = "of-display",
                .of_match_table = offb_of_match_display,
        },
        .probe = offb_probe_display,
        .remove = offb_remove,
};

static int __init offb_init(void)
{
        if (fb_get_options("offb", NULL))
                return -ENODEV;

        platform_driver_register(&offb_driver_bootx_noscreen);
        platform_driver_register(&offb_driver_display);

        return 0;
}
module_init(offb_init);

static void __exit offb_exit(void)
{
        platform_driver_unregister(&offb_driver_display);
        platform_driver_unregister(&offb_driver_bootx_noscreen);
}
module_exit(offb_exit);

MODULE_DESCRIPTION("Open Firmware frame buffer device driver");
MODULE_LICENSE("GPL");