/*
   *  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/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 <asm/io.h>

  
  #ifdef CONFIG_PPC64
  #include <asm/pci-bridge.h>
  #endif
  
  #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;
  };
  
  struct offb_par default_par;

  #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);
  	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);
  			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)
  {
  	if (info->screen_base)
  		iounmap(info->screen_base);

  	release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);

  	framebuffer_release(info);
  }

  static struct fb_ops offb_ops = {
  	.owner		= THIS_MODULE,

  	.fb_destroy	= offb_destroy,

  	.fb_setcolreg	= offb_setcolreg,
  	.fb_set_par	= offb_set_par,
  	.fb_blank	= offb_blank,
  	.fb_fillrect	= cfb_fillrect,
  	.fb_copyarea	= cfb_copyarea,
  	.fb_imageblit	= cfb_imageblit,
  };

  static void __iomem *offb_map_reg(struct device_node *np, int index,
  				  unsigned long offset, unsigned long size)

  {

  	const u32 *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,
  				    const char *name, unsigned long address)
  {
  	struct offb_par *par = (struct offb_par *) info->par;
  
  	if (dp && !strncmp(name, "ATY,Rage128", 11)) {
  		par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
  		if (par->cmap_adr)
  			par->cmap_type = cmap_r128;
  	} else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
  			  || !strncmp(name, "ATY,RageM3p12A", 14))) {
  		par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
  		if (par->cmap_adr)
  			par->cmap_type = cmap_M3A;
  	} else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
  		par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
  		if (par->cmap_adr)
  			par->cmap_type = cmap_M3B;
  	} else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
  		par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff);
  		if (par->cmap_adr)
  			par->cmap_type = cmap_radeon;
  	} else if (!strncmp(name, "ATY,", 4)) {
  		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 (dp && !strncmp(name, "vga,Display-", 12)) {
  		/* Look for AVIVO initialized by SLOF */
  		struct device_node *pciparent = 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;
  		}
  		of_node_put(pciparent);

  	} else if (dp && of_device_is_compatible(dp, "qemu,std-vga")) {
  		const u32 io_of_addr[3] = { 0x01000000, 0x0, 0x0 };
  		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 __init offb_init_fb(const char *name, const char *full_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;

  	struct offb_par *par = &default_par;
  	unsigned long res_start = address;
  	struct fb_fix_screeninfo *fix;
  	struct fb_var_screeninfo *var;
  	struct fb_info *info;

  
  	if (!request_mem_region(res_start, res_size, "offb"))
  		return;
  
  	printk(KERN_INFO
  	       "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d
  ",
  	       width, height, name, address, depth, pitch);

  	if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {

  		printk(KERN_ERR "%s: can't use depth = %d
  ", full_name,
  		       depth);
  		release_mem_region(res_start, res_size);
  		return;
  	}

  	info = framebuffer_alloc(sizeof(u32) * 16, NULL);

  	
  	if (info == 0) {
  		release_mem_region(res_start, res_size);
  		return;
  	}

  
  	fix = &info->fix;
  	var = &info->var;

  	info->par = par;

  
  	strcpy(fix->id, "OFfb ");
  	strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
  	fix->id[sizeof(fix->id) - 1] = '\0';
  
  	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, name, 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;

  	/* set offb aperture size for generic probing */

  	info->apertures = alloc_apertures(1);
  	if (!info->apertures)
  		goto out_aper;
  	info->apertures->ranges[0].base = address;
  	info->apertures->ranges[0].size = fix->smem_len;

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

  	info->pseudo_palette = (void *) (info + 1);

  	info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE | foreign_endian;

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

  	if (register_framebuffer(info) < 0)
  		goto out_err;

  
  	printk(KERN_INFO "fb%d: Open Firmware frame buffer device on %s
  ",
  	       info->node, full_name);

  	return;
  
  out_err:
  	iounmap(info->screen_base);
  out_aper:
  	iounmap(par->cmap_adr);
  	par->cmap_adr = NULL;
  	framebuffer_release(info);
  	release_mem_region(res_start, res_size);

  }

  
  static void __init offb_init_nodriver(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 u32 *pp, *addrp, *up;

  	u64 asize;

  	int foreign_endian = 0;
  
  #ifdef __BIG_ENDIAN
  	if (of_get_property(dp, "little-endian", NULL))
  		foreign_endian = FBINFO_FOREIGN_ENDIAN;
  #else
  	if (of_get_property(dp, "big-endian", NULL))
  		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 = *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 = *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 = *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 = *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) {
  		/* kludge for valkyrie */
  		if (strcmp(dp->name, "valkyrie") == 0)
  			address += 0x1000;
  		offb_init_fb(no_real_node ? "bootx" : dp->name,
  			     no_real_node ? "display" : dp->full_name,
  			     width, height, depth, pitch, address,

  			     foreign_endian, no_real_node ? NULL : dp);

  	}
  }
  
  static int __init offb_init(void)
  {
  	struct device_node *dp = NULL, *boot_disp = NULL;
  
  	if (fb_get_options("offb", NULL))
  		return -ENODEV;
  
  	/* Check if we have a MacOS display without a node spec */

  	if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) {

  		/* The old code tried to work out which node was the MacOS
  		 * display based on the address. I'm dropping that since the
  		 * lack of a node spec only happens with old BootX versions
  		 * (users can update) and with this code, they'll still get
  		 * a display (just not the palette hacks).
  		 */
  		offb_init_nodriver(of_chosen, 1);
  	}
  
  	for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {

  		if (of_get_property(dp, "linux,opened", NULL) &&
  		    of_get_property(dp, "linux,boot-display", NULL)) {

  			boot_disp = dp;
  			offb_init_nodriver(dp, 0);
  		}
  	}
  	for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {

  		if (of_get_property(dp, "linux,opened", NULL) &&

  		    dp != boot_disp)
  			offb_init_nodriver(dp, 0);
  	}
  
  	return 0;
  }

  module_init(offb_init);
  MODULE_LICENSE("GPL");