drivers/video/offb.c - kernel/msm - Gitiles

 /*
  *  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/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/delay.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>
 #include <asm/prom.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_m64,		/* 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 */
 };

 struct offb_par {
 	volatile void __iomem *cmap_adr;
 	volatile void __iomem *cmap_data;
 	int cmap_type;
 	int blanked;
 };

 struct offb_par default_par;

     /*
      *  Interface used by the world
      */

 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 			  u_int transp, struct fb_info *info);
 static int offb_blank(int blank, struct fb_info *info);

 #ifdef CONFIG_PPC32
 extern boot_infos_t *boot_infos;
 #endif

 static struct fb_ops offb_ops = {
 	.owner		= THIS_MODULE,
 	.fb_setcolreg	= offb_setcolreg,
 	.fb_blank	= offb_blank,
 	.fb_fillrect	= cfb_fillrect,
 	.fb_copyarea	= cfb_copyarea,
 	.fb_imageblit	= cfb_imageblit,
 };

     /*
      *  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;
 	int i, depth;
 	u32 *pal = info->pseudo_palette;

 	depth = info->var.bits_per_pixel;
 	if (depth == 16)
 		depth = (info->var.green.length == 5) ? 15 : 16;

 	if (regno > 255 ||
 	    (depth == 16 && regno > 63) ||
 	    (depth == 15 && regno > 31))
 		return 1;

 	if (regno < 16) {
 		switch (depth) {
 		case 15:
 			pal[regno] = (regno << 10) | (regno << 5) | regno;
 			break;
 		case 16:
 			pal[regno] = (regno << 11) | (regno << 5) | regno;
 			break;
 		case 24:
 			pal[regno] = (regno << 16) | (regno << 8) | regno;
 			break;
 		case 32:
 			i = (regno << 8) | regno;
 			pal[regno] = (i << 16) | i;
 			break;
 		}
 	}

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

 	if (!par->cmap_adr)
 		return 0;

 	switch (par->cmap_type) {
 	case cmap_m64:
 		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;
 	}

 	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_m64:
 				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;
 			}
 	} else
 		fb_set_cmap(&info->cmap, info);
 	return 0;
 }


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

 	if (of_address_to_resource(np, index, &r))
 		return 0;
 	if ((r.start + offset + size) > r.end)
 		return 0;
 	return ioremap(r.start + offset, size);
 }

 static void __init offb_init_fb(const char *name, const char *full_name,
 				int width, int height, int depth,
 				int pitch, unsigned long address,
 				struct device_node *dp)
 {
 	unsigned long res_size = pitch * height * (depth + 7) / 8;
 	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;
 	int size;

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

 	size = sizeof(struct fb_info) + sizeof(u32) * 17;

 	info = kmalloc(size, GFP_ATOMIC);

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

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

 	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) {
 		/* Palette hacks disabled for now */
 		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_m64;
 		} else if (dp && device_is_compatible(dp, "pci1014,b7")) {
 			par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000);
 			if (par->cmap_adr)
 				par->cmap_type = cmap_gxt2000;
 		}
 		fix->visual = (par->cmap_type != cmap_unknown) ?
 			FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
 	} 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;

 	info->fbops = &offb_ops;
 	info->screen_base = ioremap(address, fix->smem_len);
 	info->par = par;
 	info->pseudo_palette = (void *) (info + 1);
 	info->flags = FBINFO_DEFAULT;

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

 	if (register_framebuffer(info) < 0) {
 		kfree(info);
 		release_mem_region(res_start, res_size);
 		return;
 	}

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


 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;
 	u32 *pp, *addrp, *up;
 	u64 asize;

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

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

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

 	pp = (u32 *)get_property(dp, "linux,bootx-linebytes", &len);
 	if (pp == NULL)
 		pp = (u32 *)get_property(dp, "linebytes", &len);
 	if (pp && len == sizeof(u32))
 		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 = (u32 *)get_property(dp, "linux,bootx-addr", &len);
 	if (up == NULL)
 		up = (u32 *)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,
 			     no_real_node ? dp : NULL);
 	}
 }

 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 (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 (get_property(dp, "linux,opened", NULL) &&
 		    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 (get_property(dp, "linux,opened", NULL) &&
 		    dp != boot_disp)
 			offb_init_nodriver(dp, 0);
 	}

 	return 0;
 }


 module_init(offb_init);
 MODULE_LICENSE("GPL");
	/*
	* 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/slab.h>
	#include <linux/vmalloc.h>
	#include <linux/delay.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>
	#include <asm/prom.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_m64, /* 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 */
	};

	struct offb_par {
	volatile void __iomem *cmap_adr;
	volatile void __iomem *cmap_data;
	int cmap_type;
	int blanked;
	};

	struct offb_par default_par;

	/*
	* Interface used by the world
	*/

	static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
	u_int transp, struct fb_info *info);
	static int offb_blank(int blank, struct fb_info *info);

	#ifdef CONFIG_PPC32
	extern boot_infos_t *boot_infos;
	#endif

	static struct fb_ops offb_ops = {
	.owner = THIS_MODULE,
	.fb_setcolreg = offb_setcolreg,
	.fb_blank = offb_blank,
	.fb_fillrect = cfb_fillrect,
	.fb_copyarea = cfb_copyarea,
	.fb_imageblit = cfb_imageblit,
	};

	/*
	* 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;
	int i, depth;
	u32 *pal = info->pseudo_palette;

	depth = info->var.bits_per_pixel;
	if (depth == 16)
	depth = (info->var.green.length == 5) ? 15 : 16;

	if (regno > 255 \|\|
	(depth == 16 && regno > 63) \|\|
	(depth == 15 && regno > 31))
	return 1;

	if (regno < 16) {
	switch (depth) {
	case 15:
	pal[regno] = (regno << 10) \| (regno << 5) \| regno;
	break;
	case 16:
	pal[regno] = (regno << 11) \| (regno << 5) \| regno;
	break;
	case 24:
	pal[regno] = (regno << 16) \| (regno << 8) \| regno;
	break;
	case 32:
	i = (regno << 8) \| regno;
	pal[regno] = (i << 16) \| i;
	break;
	}
	}

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

	if (!par->cmap_adr)
	return 0;

	switch (par->cmap_type) {
	case cmap_m64:
	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;
	}

	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_m64:
	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;
	}
	} else
	fb_set_cmap(&info->cmap, info);
	return 0;
	}


	static void __iomem offb_map_reg(struct device_node np, int index,
	unsigned long offset, unsigned long size)
	{
	struct resource r;

	if (of_address_to_resource(np, index, &r))
	return 0;
	if ((r.start + offset + size) > r.end)
	return 0;
	return ioremap(r.start + offset, size);
	}

	static void __init offb_init_fb(const char name, const char full_name,
	int width, int height, int depth,
	int pitch, unsigned long address,
	struct device_node *dp)
	{
	unsigned long res_size = pitch * height * (depth + 7) / 8;
	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;
	int size;

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

	size = sizeof(struct fb_info) + sizeof(u32) * 17;

	info = kmalloc(size, GFP_ATOMIC);

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

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

	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) {
	/* Palette hacks disabled for now */
	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_m64;
	} else if (dp && device_is_compatible(dp, "pci1014,b7")) {
	par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000);
	if (par->cmap_adr)
	par->cmap_type = cmap_gxt2000;
	}
	fix->visual = (par->cmap_type != cmap_unknown) ?
	FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
	} 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;

	info->fbops = &offb_ops;
	info->screen_base = ioremap(address, fix->smem_len);
	info->par = par;
	info->pseudo_palette = (void *) (info + 1);
	info->flags = FBINFO_DEFAULT;

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

	if (register_framebuffer(info) < 0) {
	kfree(info);
	release_mem_region(res_start, res_size);
	return;
	}

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


	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;
	u32 pp, addrp, *up;
	u64 asize;

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

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

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

	pp = (u32 *)get_property(dp, "linux,bootx-linebytes", &len);
	if (pp == NULL)
	pp = (u32 *)get_property(dp, "linebytes", &len);
	if (pp && len == sizeof(u32))
	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 = (u32 *)get_property(dp, "linux,bootx-addr", &len);
	if (up == NULL)
	up = (u32 *)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,
	no_real_node ? dp : NULL);
	}
	}

	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 (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 (get_property(dp, "linux,opened", NULL) &&
	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 (get_property(dp, "linux,opened", NULL) &&
	dp != boot_disp)
	offb_init_nodriver(dp, 0);
	}

	return 0;
	}


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