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offb.c (20372B)


      1 /*
      2  *  linux/drivers/video/offb.c -- Open Firmware based frame buffer device
      3  *
      4  *	Copyright (C) 1997 Geert Uytterhoeven
      5  *
      6  *  This driver is partly based on the PowerMac console driver:
      7  *
      8  *	Copyright (C) 1996 Paul Mackerras
      9  *
     10  *  This file is subject to the terms and conditions of the GNU General Public
     11  *  License. See the file COPYING in the main directory of this archive for
     12  *  more details.
     13  */
     14 
     15 #include <linux/module.h>
     16 #include <linux/kernel.h>
     17 #include <linux/errno.h>
     18 #include <linux/string.h>
     19 #include <linux/mm.h>
     20 #include <linux/vmalloc.h>
     21 #include <linux/delay.h>
     22 #include <linux/of.h>
     23 #include <linux/of_address.h>
     24 #include <linux/interrupt.h>
     25 #include <linux/fb.h>
     26 #include <linux/init.h>
     27 #include <linux/ioport.h>
     28 #include <linux/pci.h>
     29 #include <asm/io.h>
     30 
     31 #ifdef CONFIG_PPC32
     32 #include <asm/bootx.h>
     33 #endif
     34 
     35 #include "macmodes.h"
     36 
     37 /* Supported palette hacks */
     38 enum {
     39 	cmap_unknown,
     40 	cmap_simple,		/* ATI Mach64 */
     41 	cmap_r128,		/* ATI Rage128 */
     42 	cmap_M3A,		/* ATI Rage Mobility M3 Head A */
     43 	cmap_M3B,		/* ATI Rage Mobility M3 Head B */
     44 	cmap_radeon,		/* ATI Radeon */
     45 	cmap_gxt2000,		/* IBM GXT2000 */
     46 	cmap_avivo,		/* ATI R5xx */
     47 	cmap_qemu,		/* qemu vga */
     48 };
     49 
     50 struct offb_par {
     51 	volatile void __iomem *cmap_adr;
     52 	volatile void __iomem *cmap_data;
     53 	int cmap_type;
     54 	int blanked;
     55 };
     56 
     57 struct offb_par default_par;
     58 
     59 #ifdef CONFIG_PPC32
     60 extern boot_infos_t *boot_infos;
     61 #endif
     62 
     63 /* Definitions used by the Avivo palette hack */
     64 #define AVIVO_DC_LUT_RW_SELECT                  0x6480
     65 #define AVIVO_DC_LUT_RW_MODE                    0x6484
     66 #define AVIVO_DC_LUT_RW_INDEX                   0x6488
     67 #define AVIVO_DC_LUT_SEQ_COLOR                  0x648c
     68 #define AVIVO_DC_LUT_PWL_DATA                   0x6490
     69 #define AVIVO_DC_LUT_30_COLOR                   0x6494
     70 #define AVIVO_DC_LUT_READ_PIPE_SELECT           0x6498
     71 #define AVIVO_DC_LUT_WRITE_EN_MASK              0x649c
     72 #define AVIVO_DC_LUT_AUTOFILL                   0x64a0
     73 
     74 #define AVIVO_DC_LUTA_CONTROL                   0x64c0
     75 #define AVIVO_DC_LUTA_BLACK_OFFSET_BLUE         0x64c4
     76 #define AVIVO_DC_LUTA_BLACK_OFFSET_GREEN        0x64c8
     77 #define AVIVO_DC_LUTA_BLACK_OFFSET_RED          0x64cc
     78 #define AVIVO_DC_LUTA_WHITE_OFFSET_BLUE         0x64d0
     79 #define AVIVO_DC_LUTA_WHITE_OFFSET_GREEN        0x64d4
     80 #define AVIVO_DC_LUTA_WHITE_OFFSET_RED          0x64d8
     81 
     82 #define AVIVO_DC_LUTB_CONTROL                   0x6cc0
     83 #define AVIVO_DC_LUTB_BLACK_OFFSET_BLUE         0x6cc4
     84 #define AVIVO_DC_LUTB_BLACK_OFFSET_GREEN        0x6cc8
     85 #define AVIVO_DC_LUTB_BLACK_OFFSET_RED          0x6ccc
     86 #define AVIVO_DC_LUTB_WHITE_OFFSET_BLUE         0x6cd0
     87 #define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN        0x6cd4
     88 #define AVIVO_DC_LUTB_WHITE_OFFSET_RED          0x6cd8
     89 
     90     /*
     91      *  Set a single color register. The values supplied are already
     92      *  rounded down to the hardware's capabilities (according to the
     93      *  entries in the var structure). Return != 0 for invalid regno.
     94      */
     95 
     96 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
     97 			  u_int transp, struct fb_info *info)
     98 {
     99 	struct offb_par *par = (struct offb_par *) info->par;
    100 
    101 	if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
    102 		u32 *pal = info->pseudo_palette;
    103 		u32 cr = red >> (16 - info->var.red.length);
    104 		u32 cg = green >> (16 - info->var.green.length);
    105 		u32 cb = blue >> (16 - info->var.blue.length);
    106 		u32 value;
    107 
    108 		if (regno >= 16)
    109 			return -EINVAL;
    110 
    111 		value = (cr << info->var.red.offset) |
    112 			(cg << info->var.green.offset) |
    113 			(cb << info->var.blue.offset);
    114 		if (info->var.transp.length > 0) {
    115 			u32 mask = (1 << info->var.transp.length) - 1;
    116 			mask <<= info->var.transp.offset;
    117 			value |= mask;
    118 		}
    119 		pal[regno] = value;
    120 		return 0;
    121 	}
    122 
    123 	if (regno > 255)
    124 		return -EINVAL;
    125 
    126 	red >>= 8;
    127 	green >>= 8;
    128 	blue >>= 8;
    129 
    130 	if (!par->cmap_adr)
    131 		return 0;
    132 
    133 	switch (par->cmap_type) {
    134 	case cmap_simple:
    135 		writeb(regno, par->cmap_adr);
    136 		writeb(red, par->cmap_data);
    137 		writeb(green, par->cmap_data);
    138 		writeb(blue, par->cmap_data);
    139 		break;
    140 	case cmap_M3A:
    141 		/* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
    142 		out_le32(par->cmap_adr + 0x58,
    143 			 in_le32(par->cmap_adr + 0x58) & ~0x20);
    144 		/* fall through */
    145 	case cmap_r128:
    146 		/* Set palette index & data */
    147 		out_8(par->cmap_adr + 0xb0, regno);
    148 		out_le32(par->cmap_adr + 0xb4,
    149 			 (red << 16 | green << 8 | blue));
    150 		break;
    151 	case cmap_M3B:
    152 		/* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
    153 		out_le32(par->cmap_adr + 0x58,
    154 			 in_le32(par->cmap_adr + 0x58) | 0x20);
    155 		/* Set palette index & data */
    156 		out_8(par->cmap_adr + 0xb0, regno);
    157 		out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
    158 		break;
    159 	case cmap_radeon:
    160 		/* Set palette index & data (could be smarter) */
    161 		out_8(par->cmap_adr + 0xb0, regno);
    162 		out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
    163 		break;
    164 	case cmap_gxt2000:
    165 		out_le32(((unsigned __iomem *) par->cmap_adr) + regno,
    166 			 (red << 16 | green << 8 | blue));
    167 		break;
    168 	case cmap_avivo:
    169 		/* Write to both LUTs for now */
    170 		writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
    171 		writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
    172 		writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
    173 		       par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
    174 		writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
    175 		writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
    176 		writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
    177 		       par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
    178 		break;
    179 	}
    180 
    181 	return 0;
    182 }
    183 
    184     /*
    185      *  Blank the display.
    186      */
    187 
    188 static int offb_blank(int blank, struct fb_info *info)
    189 {
    190 	struct offb_par *par = (struct offb_par *) info->par;
    191 	int i, j;
    192 
    193 	if (!par->cmap_adr)
    194 		return 0;
    195 
    196 	if (!par->blanked)
    197 		if (!blank)
    198 			return 0;
    199 
    200 	par->blanked = blank;
    201 
    202 	if (blank)
    203 		for (i = 0; i < 256; i++) {
    204 			switch (par->cmap_type) {
    205 			case cmap_simple:
    206 				writeb(i, par->cmap_adr);
    207 				for (j = 0; j < 3; j++)
    208 					writeb(0, par->cmap_data);
    209 				break;
    210 			case cmap_M3A:
    211 				/* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
    212 				out_le32(par->cmap_adr + 0x58,
    213 					 in_le32(par->cmap_adr + 0x58) & ~0x20);
    214 				/* fall through */
    215 			case cmap_r128:
    216 				/* Set palette index & data */
    217 				out_8(par->cmap_adr + 0xb0, i);
    218 				out_le32(par->cmap_adr + 0xb4, 0);
    219 				break;
    220 			case cmap_M3B:
    221 				/* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
    222 				out_le32(par->cmap_adr + 0x58,
    223 					 in_le32(par->cmap_adr + 0x58) | 0x20);
    224 				/* Set palette index & data */
    225 				out_8(par->cmap_adr + 0xb0, i);
    226 				out_le32(par->cmap_adr + 0xb4, 0);
    227 				break;
    228 			case cmap_radeon:
    229 				out_8(par->cmap_adr + 0xb0, i);
    230 				out_le32(par->cmap_adr + 0xb4, 0);
    231 				break;
    232 			case cmap_gxt2000:
    233 				out_le32(((unsigned __iomem *) par->cmap_adr) + i,
    234 					 0);
    235 				break;
    236 			case cmap_avivo:
    237 				writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
    238 				writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
    239 				writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
    240 				writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
    241 				writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
    242 				writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
    243 				break;
    244 			}
    245 	} else
    246 		fb_set_cmap(&info->cmap, info);
    247 	return 0;
    248 }
    249 
    250 static int offb_set_par(struct fb_info *info)
    251 {
    252 	struct offb_par *par = (struct offb_par *) info->par;
    253 
    254 	/* On avivo, initialize palette control */
    255 	if (par->cmap_type == cmap_avivo) {
    256 		writel(0, par->cmap_adr + AVIVO_DC_LUTA_CONTROL);
    257 		writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_BLUE);
    258 		writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_GREEN);
    259 		writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_RED);
    260 		writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_BLUE);
    261 		writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_GREEN);
    262 		writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_RED);
    263 		writel(0, par->cmap_adr + AVIVO_DC_LUTB_CONTROL);
    264 		writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_BLUE);
    265 		writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_GREEN);
    266 		writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_RED);
    267 		writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_BLUE);
    268 		writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_GREEN);
    269 		writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_RED);
    270 		writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
    271 		writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
    272 		writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
    273 		writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
    274 		writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
    275 		writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
    276 	}
    277 	return 0;
    278 }
    279 
    280 static void offb_destroy(struct fb_info *info)
    281 {
    282 	if (info->screen_base)
    283 		iounmap(info->screen_base);
    284 	release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
    285 	fb_dealloc_cmap(&info->cmap);
    286 	framebuffer_release(info);
    287 }
    288 
    289 static struct fb_ops offb_ops = {
    290 	.owner		= THIS_MODULE,
    291 	.fb_destroy	= offb_destroy,
    292 	.fb_setcolreg	= offb_setcolreg,
    293 	.fb_set_par	= offb_set_par,
    294 	.fb_blank	= offb_blank,
    295 	.fb_fillrect	= cfb_fillrect,
    296 	.fb_copyarea	= cfb_copyarea,
    297 	.fb_imageblit	= cfb_imageblit,
    298 };
    299 
    300 static void __iomem *offb_map_reg(struct device_node *np, int index,
    301 				  unsigned long offset, unsigned long size)
    302 {
    303 	const __be32 *addrp;
    304 	u64 asize, taddr;
    305 	unsigned int flags;
    306 
    307 	addrp = of_get_pci_address(np, index, &asize, &flags);
    308 	if (addrp == NULL)
    309 		addrp = of_get_address(np, index, &asize, &flags);
    310 	if (addrp == NULL)
    311 		return NULL;
    312 	if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
    313 		return NULL;
    314 	if ((offset + size) > asize)
    315 		return NULL;
    316 	taddr = of_translate_address(np, addrp);
    317 	if (taddr == OF_BAD_ADDR)
    318 		return NULL;
    319 	return ioremap(taddr + offset, size);
    320 }
    321 
    322 static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp,
    323 				    unsigned long address)
    324 {
    325 	struct offb_par *par = (struct offb_par *) info->par;
    326 
    327 	if (of_node_name_prefix(dp, "ATY,Rage128")) {
    328 		par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
    329 		if (par->cmap_adr)
    330 			par->cmap_type = cmap_r128;
    331 	} else if (of_node_name_prefix(dp, "ATY,RageM3pA") ||
    332 		   of_node_name_prefix(dp, "ATY,RageM3p12A")) {
    333 		par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
    334 		if (par->cmap_adr)
    335 			par->cmap_type = cmap_M3A;
    336 	} else if (of_node_name_prefix(dp, "ATY,RageM3pB")) {
    337 		par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
    338 		if (par->cmap_adr)
    339 			par->cmap_type = cmap_M3B;
    340 	} else if (of_node_name_prefix(dp, "ATY,Rage6")) {
    341 		par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff);
    342 		if (par->cmap_adr)
    343 			par->cmap_type = cmap_radeon;
    344 	} else if (of_node_name_prefix(dp, "ATY,")) {
    345 		unsigned long base = address & 0xff000000UL;
    346 		par->cmap_adr =
    347 			ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
    348 		par->cmap_data = par->cmap_adr + 1;
    349 		par->cmap_type = cmap_simple;
    350 	} else if (dp && (of_device_is_compatible(dp, "pci1014,b7") ||
    351 			  of_device_is_compatible(dp, "pci1014,21c"))) {
    352 		par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000);
    353 		if (par->cmap_adr)
    354 			par->cmap_type = cmap_gxt2000;
    355 	} else if (of_node_name_prefix(dp, "vga,Display-")) {
    356 		/* Look for AVIVO initialized by SLOF */
    357 		struct device_node *pciparent = of_get_parent(dp);
    358 		const u32 *vid, *did;
    359 		vid = of_get_property(pciparent, "vendor-id", NULL);
    360 		did = of_get_property(pciparent, "device-id", NULL);
    361 		/* This will match most R5xx */
    362 		if (vid && did && *vid == 0x1002 &&
    363 		    ((*did >= 0x7100 && *did < 0x7800) ||
    364 		     (*did >= 0x9400))) {
    365 			par->cmap_adr = offb_map_reg(pciparent, 2, 0, 0x10000);
    366 			if (par->cmap_adr)
    367 				par->cmap_type = cmap_avivo;
    368 		}
    369 		of_node_put(pciparent);
    370 	} else if (dp && of_device_is_compatible(dp, "qemu,std-vga")) {
    371 #ifdef __BIG_ENDIAN
    372 		const __be32 io_of_addr[3] = { 0x01000000, 0x0, 0x0 };
    373 #else
    374 		const __be32 io_of_addr[3] = { 0x00000001, 0x0, 0x0 };
    375 #endif
    376 		u64 io_addr = of_translate_address(dp, io_of_addr);
    377 		if (io_addr != OF_BAD_ADDR) {
    378 			par->cmap_adr = ioremap(io_addr + 0x3c8, 2);
    379 			if (par->cmap_adr) {
    380 				par->cmap_type = cmap_simple;
    381 				par->cmap_data = par->cmap_adr + 1;
    382 			}
    383 		}
    384 	}
    385 	info->fix.visual = (par->cmap_type != cmap_unknown) ?
    386 		FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
    387 }
    388 
    389 static void __init offb_init_fb(const char *name,
    390 				int width, int height, int depth,
    391 				int pitch, unsigned long address,
    392 				int foreign_endian, struct device_node *dp)
    393 {
    394 	unsigned long res_size = pitch * height;
    395 	struct offb_par *par = &default_par;
    396 	unsigned long res_start = address;
    397 	struct fb_fix_screeninfo *fix;
    398 	struct fb_var_screeninfo *var;
    399 	struct fb_info *info;
    400 
    401 	if (!request_mem_region(res_start, res_size, "offb"))
    402 		return;
    403 
    404 	printk(KERN_INFO
    405 	       "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
    406 	       width, height, name, address, depth, pitch);
    407 	if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
    408 		printk(KERN_ERR "%pOF: can't use depth = %d\n", dp, depth);
    409 		release_mem_region(res_start, res_size);
    410 		return;
    411 	}
    412 
    413 	info = framebuffer_alloc(sizeof(u32) * 16, NULL);
    414 
    415 	if (info == 0) {
    416 		release_mem_region(res_start, res_size);
    417 		return;
    418 	}
    419 
    420 	fix = &info->fix;
    421 	var = &info->var;
    422 	info->par = par;
    423 
    424 	if (name) {
    425 		strcpy(fix->id, "OFfb ");
    426 		strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
    427 		fix->id[sizeof(fix->id) - 1] = '\0';
    428 	} else
    429 		snprintf(fix->id, sizeof(fix->id), "OFfb %pOFn", dp);
    430 
    431 
    432 	var->xres = var->xres_virtual = width;
    433 	var->yres = var->yres_virtual = height;
    434 	fix->line_length = pitch;
    435 
    436 	fix->smem_start = address;
    437 	fix->smem_len = pitch * height;
    438 	fix->type = FB_TYPE_PACKED_PIXELS;
    439 	fix->type_aux = 0;
    440 
    441 	par->cmap_type = cmap_unknown;
    442 	if (depth == 8)
    443 		offb_init_palette_hacks(info, dp, address);
    444 	else
    445 		fix->visual = FB_VISUAL_TRUECOLOR;
    446 
    447 	var->xoffset = var->yoffset = 0;
    448 	switch (depth) {
    449 	case 8:
    450 		var->bits_per_pixel = 8;
    451 		var->red.offset = 0;
    452 		var->red.length = 8;
    453 		var->green.offset = 0;
    454 		var->green.length = 8;
    455 		var->blue.offset = 0;
    456 		var->blue.length = 8;
    457 		var->transp.offset = 0;
    458 		var->transp.length = 0;
    459 		break;
    460 	case 15:		/* RGB 555 */
    461 		var->bits_per_pixel = 16;
    462 		var->red.offset = 10;
    463 		var->red.length = 5;
    464 		var->green.offset = 5;
    465 		var->green.length = 5;
    466 		var->blue.offset = 0;
    467 		var->blue.length = 5;
    468 		var->transp.offset = 0;
    469 		var->transp.length = 0;
    470 		break;
    471 	case 16:		/* RGB 565 */
    472 		var->bits_per_pixel = 16;
    473 		var->red.offset = 11;
    474 		var->red.length = 5;
    475 		var->green.offset = 5;
    476 		var->green.length = 6;
    477 		var->blue.offset = 0;
    478 		var->blue.length = 5;
    479 		var->transp.offset = 0;
    480 		var->transp.length = 0;
    481 		break;
    482 	case 32:		/* RGB 888 */
    483 		var->bits_per_pixel = 32;
    484 		var->red.offset = 16;
    485 		var->red.length = 8;
    486 		var->green.offset = 8;
    487 		var->green.length = 8;
    488 		var->blue.offset = 0;
    489 		var->blue.length = 8;
    490 		var->transp.offset = 24;
    491 		var->transp.length = 8;
    492 		break;
    493 	}
    494 	var->red.msb_right = var->green.msb_right = var->blue.msb_right =
    495 	    var->transp.msb_right = 0;
    496 	var->grayscale = 0;
    497 	var->nonstd = 0;
    498 	var->activate = 0;
    499 	var->height = var->width = -1;
    500 	var->pixclock = 10000;
    501 	var->left_margin = var->right_margin = 16;
    502 	var->upper_margin = var->lower_margin = 16;
    503 	var->hsync_len = var->vsync_len = 8;
    504 	var->sync = 0;
    505 	var->vmode = FB_VMODE_NONINTERLACED;
    506 
    507 	/* set offb aperture size for generic probing */
    508 	info->apertures = alloc_apertures(1);
    509 	if (!info->apertures)
    510 		goto out_aper;
    511 	info->apertures->ranges[0].base = address;
    512 	info->apertures->ranges[0].size = fix->smem_len;
    513 
    514 	info->fbops = &offb_ops;
    515 	info->screen_base = ioremap(address, fix->smem_len);
    516 	info->pseudo_palette = (void *) (info + 1);
    517 	info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE | foreign_endian;
    518 
    519 	fb_alloc_cmap(&info->cmap, 256, 0);
    520 
    521 	if (register_framebuffer(info) < 0)
    522 		goto out_err;
    523 
    524 	fb_info(info, "Open Firmware frame buffer device on %pOF\n", dp);
    525 	return;
    526 
    527 out_err:
    528 	fb_dealloc_cmap(&info->cmap);
    529 	iounmap(info->screen_base);
    530 out_aper:
    531 	iounmap(par->cmap_adr);
    532 	par->cmap_adr = NULL;
    533 	framebuffer_release(info);
    534 	release_mem_region(res_start, res_size);
    535 }
    536 
    537 
    538 static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
    539 {
    540 	unsigned int len;
    541 	int i, width = 640, height = 480, depth = 8, pitch = 640;
    542 	unsigned int flags, rsize, addr_prop = 0;
    543 	unsigned long max_size = 0;
    544 	u64 rstart, address = OF_BAD_ADDR;
    545 	const __be32 *pp, *addrp, *up;
    546 	u64 asize;
    547 	int foreign_endian = 0;
    548 
    549 #ifdef __BIG_ENDIAN
    550 	if (of_get_property(dp, "little-endian", NULL))
    551 		foreign_endian = FBINFO_FOREIGN_ENDIAN;
    552 #else
    553 	if (of_get_property(dp, "big-endian", NULL))
    554 		foreign_endian = FBINFO_FOREIGN_ENDIAN;
    555 #endif
    556 
    557 	pp = of_get_property(dp, "linux,bootx-depth", &len);
    558 	if (pp == NULL)
    559 		pp = of_get_property(dp, "depth", &len);
    560 	if (pp && len == sizeof(u32))
    561 		depth = be32_to_cpup(pp);
    562 
    563 	pp = of_get_property(dp, "linux,bootx-width", &len);
    564 	if (pp == NULL)
    565 		pp = of_get_property(dp, "width", &len);
    566 	if (pp && len == sizeof(u32))
    567 		width = be32_to_cpup(pp);
    568 
    569 	pp = of_get_property(dp, "linux,bootx-height", &len);
    570 	if (pp == NULL)
    571 		pp = of_get_property(dp, "height", &len);
    572 	if (pp && len == sizeof(u32))
    573 		height = be32_to_cpup(pp);
    574 
    575 	pp = of_get_property(dp, "linux,bootx-linebytes", &len);
    576 	if (pp == NULL)
    577 		pp = of_get_property(dp, "linebytes", &len);
    578 	if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
    579 		pitch = be32_to_cpup(pp);
    580 	else
    581 		pitch = width * ((depth + 7) / 8);
    582 
    583 	rsize = (unsigned long)pitch * (unsigned long)height;
    584 
    585 	/* Ok, now we try to figure out the address of the framebuffer.
    586 	 *
    587 	 * Unfortunately, Open Firmware doesn't provide a standard way to do
    588 	 * so. All we can do is a dodgy heuristic that happens to work in
    589 	 * practice. On most machines, the "address" property contains what
    590 	 * we need, though not on Matrox cards found in IBM machines. What I've
    591 	 * found that appears to give good results is to go through the PCI
    592 	 * ranges and pick one that is both big enough and if possible encloses
    593 	 * the "address" property. If none match, we pick the biggest
    594 	 */
    595 	up = of_get_property(dp, "linux,bootx-addr", &len);
    596 	if (up == NULL)
    597 		up = of_get_property(dp, "address", &len);
    598 	if (up && len == sizeof(u32))
    599 		addr_prop = *up;
    600 
    601 	/* Hack for when BootX is passing us */
    602 	if (no_real_node)
    603 		goto skip_addr;
    604 
    605 	for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
    606 		     != NULL; i++) {
    607 		int match_addrp = 0;
    608 
    609 		if (!(flags & IORESOURCE_MEM))
    610 			continue;
    611 		if (asize < rsize)
    612 			continue;
    613 		rstart = of_translate_address(dp, addrp);
    614 		if (rstart == OF_BAD_ADDR)
    615 			continue;
    616 		if (addr_prop && (rstart <= addr_prop) &&
    617 		    ((rstart + asize) >= (addr_prop + rsize)))
    618 			match_addrp = 1;
    619 		if (match_addrp) {
    620 			address = addr_prop;
    621 			break;
    622 		}
    623 		if (rsize > max_size) {
    624 			max_size = rsize;
    625 			address = OF_BAD_ADDR;
    626  		}
    627 
    628 		if (address == OF_BAD_ADDR)
    629 			address = rstart;
    630 	}
    631  skip_addr:
    632 	if (address == OF_BAD_ADDR && addr_prop)
    633 		address = (u64)addr_prop;
    634 	if (address != OF_BAD_ADDR) {
    635 #ifdef CONFIG_PCI
    636 		const __be32 *vidp, *didp;
    637 		u32 vid, did;
    638 		struct pci_dev *pdev;
    639 
    640 		vidp = of_get_property(dp, "vendor-id", NULL);
    641 		didp = of_get_property(dp, "device-id", NULL);
    642 		if (vidp && didp) {
    643 			vid = be32_to_cpup(vidp);
    644 			did = be32_to_cpup(didp);
    645 			pdev = pci_get_device(vid, did, NULL);
    646 			if (!pdev || pci_enable_device(pdev))
    647 				return;
    648 		}
    649 #endif
    650 		/* kludge for valkyrie */
    651 		if (of_node_name_eq(dp, "valkyrie"))
    652 			address += 0x1000;
    653 		offb_init_fb(no_real_node ? "bootx" : NULL,
    654 			     width, height, depth, pitch, address,
    655 			     foreign_endian, no_real_node ? NULL : dp);
    656 	}
    657 }
    658 
    659 static int __init offb_init(void)
    660 {
    661 	struct device_node *dp = NULL, *boot_disp = NULL;
    662 
    663 	if (fb_get_options("offb", NULL))
    664 		return -ENODEV;
    665 
    666 	/* Check if we have a MacOS display without a node spec */
    667 	if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) {
    668 		/* The old code tried to work out which node was the MacOS
    669 		 * display based on the address. I'm dropping that since the
    670 		 * lack of a node spec only happens with old BootX versions
    671 		 * (users can update) and with this code, they'll still get
    672 		 * a display (just not the palette hacks).
    673 		 */
    674 		offb_init_nodriver(of_chosen, 1);
    675 	}
    676 
    677 	for_each_node_by_type(dp, "display") {
    678 		if (of_get_property(dp, "linux,opened", NULL) &&
    679 		    of_get_property(dp, "linux,boot-display", NULL)) {
    680 			boot_disp = dp;
    681 			offb_init_nodriver(dp, 0);
    682 		}
    683 	}
    684 	for_each_node_by_type(dp, "display") {
    685 		if (of_get_property(dp, "linux,opened", NULL) &&
    686 		    dp != boot_disp)
    687 			offb_init_nodriver(dp, 0);
    688 	}
    689 
    690 	return 0;
    691 }
    692 
    693 
    694 module_init(offb_init);
    695 MODULE_LICENSE("GPL");