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  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_PPC64
 32#include <asm/pci-bridge.h>
 33#endif
 34
 35#ifdef CONFIG_PPC32
 36#include <asm/bootx.h>
 37#endif
 38
 39#include "macmodes.h"
 40
 41/* Supported palette hacks */
 42enum {
 43	cmap_unknown,
 44	cmap_simple,		/* ATI Mach64 */
 45	cmap_r128,		/* ATI Rage128 */
 46	cmap_M3A,		/* ATI Rage Mobility M3 Head A */
 47	cmap_M3B,		/* ATI Rage Mobility M3 Head B */
 48	cmap_radeon,		/* ATI Radeon */
 49	cmap_gxt2000,		/* IBM GXT2000 */
 50	cmap_avivo,		/* ATI R5xx */
 51	cmap_qemu,		/* qemu vga */
 52};
 53
 54struct offb_par {
 55	volatile void __iomem *cmap_adr;
 56	volatile void __iomem *cmap_data;
 57	int cmap_type;
 58	int blanked;
 59};
 60
 61struct offb_par default_par;
 62
 63#ifdef CONFIG_PPC32
 64extern boot_infos_t *boot_infos;
 65#endif
 66
 67/* Definitions used by the Avivo palette hack */
 68#define AVIVO_DC_LUT_RW_SELECT                  0x6480
 69#define AVIVO_DC_LUT_RW_MODE                    0x6484
 70#define AVIVO_DC_LUT_RW_INDEX                   0x6488
 71#define AVIVO_DC_LUT_SEQ_COLOR                  0x648c
 72#define AVIVO_DC_LUT_PWL_DATA                   0x6490
 73#define AVIVO_DC_LUT_30_COLOR                   0x6494
 74#define AVIVO_DC_LUT_READ_PIPE_SELECT           0x6498
 75#define AVIVO_DC_LUT_WRITE_EN_MASK              0x649c
 76#define AVIVO_DC_LUT_AUTOFILL                   0x64a0
 77
 78#define AVIVO_DC_LUTA_CONTROL                   0x64c0
 79#define AVIVO_DC_LUTA_BLACK_OFFSET_BLUE         0x64c4
 80#define AVIVO_DC_LUTA_BLACK_OFFSET_GREEN        0x64c8
 81#define AVIVO_DC_LUTA_BLACK_OFFSET_RED          0x64cc
 82#define AVIVO_DC_LUTA_WHITE_OFFSET_BLUE         0x64d0
 83#define AVIVO_DC_LUTA_WHITE_OFFSET_GREEN        0x64d4
 84#define AVIVO_DC_LUTA_WHITE_OFFSET_RED          0x64d8
 85
 86#define AVIVO_DC_LUTB_CONTROL                   0x6cc0
 87#define AVIVO_DC_LUTB_BLACK_OFFSET_BLUE         0x6cc4
 88#define AVIVO_DC_LUTB_BLACK_OFFSET_GREEN        0x6cc8
 89#define AVIVO_DC_LUTB_BLACK_OFFSET_RED          0x6ccc
 90#define AVIVO_DC_LUTB_WHITE_OFFSET_BLUE         0x6cd0
 91#define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN        0x6cd4
 92#define AVIVO_DC_LUTB_WHITE_OFFSET_RED          0x6cd8
 93
 94    /*
 95     *  Set a single color register. The values supplied are already
 96     *  rounded down to the hardware's capabilities (according to the
 97     *  entries in the var structure). Return != 0 for invalid regno.
 98     */
 99
100static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
101			  u_int transp, struct fb_info *info)
102{
103	struct offb_par *par = (struct offb_par *) info->par;
104
105	if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
106		u32 *pal = info->pseudo_palette;
107		u32 cr = red >> (16 - info->var.red.length);
108		u32 cg = green >> (16 - info->var.green.length);
109		u32 cb = blue >> (16 - info->var.blue.length);
110		u32 value;
111
112		if (regno >= 16)
113			return -EINVAL;
114
115		value = (cr << info->var.red.offset) |
116			(cg << info->var.green.offset) |
117			(cb << info->var.blue.offset);
118		if (info->var.transp.length > 0) {
119			u32 mask = (1 << info->var.transp.length) - 1;
120			mask <<= info->var.transp.offset;
121			value |= mask;
122		}
123		pal[regno] = value;
124		return 0;
125	}
126
127	if (regno > 255)
128		return -EINVAL;
129
130	red >>= 8;
131	green >>= 8;
132	blue >>= 8;
133
134	if (!par->cmap_adr)
135		return 0;
136
137	switch (par->cmap_type) {
138	case cmap_simple:
139		writeb(regno, par->cmap_adr);
140		writeb(red, par->cmap_data);
141		writeb(green, par->cmap_data);
142		writeb(blue, par->cmap_data);
143		break;
144	case cmap_M3A:
145		/* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
146		out_le32(par->cmap_adr + 0x58,
147			 in_le32(par->cmap_adr + 0x58) & ~0x20);
148	case cmap_r128:
149		/* Set palette index & data */
150		out_8(par->cmap_adr + 0xb0, regno);
151		out_le32(par->cmap_adr + 0xb4,
152			 (red << 16 | green << 8 | blue));
153		break;
154	case cmap_M3B:
155		/* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
156		out_le32(par->cmap_adr + 0x58,
157			 in_le32(par->cmap_adr + 0x58) | 0x20);
158		/* Set palette index & data */
159		out_8(par->cmap_adr + 0xb0, regno);
160		out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
161		break;
162	case cmap_radeon:
163		/* Set palette index & data (could be smarter) */
164		out_8(par->cmap_adr + 0xb0, regno);
165		out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
166		break;
167	case cmap_gxt2000:
168		out_le32(((unsigned __iomem *) par->cmap_adr) + regno,
169			 (red << 16 | green << 8 | blue));
170		break;
171	case cmap_avivo:
172		/* Write to both LUTs for now */
173		writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
174		writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
175		writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
176		       par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
177		writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
178		writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
179		writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
180		       par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
181		break;
182	}
183
184	return 0;
185}
186
187    /*
188     *  Blank the display.
189     */
190
191static int offb_blank(int blank, struct fb_info *info)
192{
193	struct offb_par *par = (struct offb_par *) info->par;
194	int i, j;
195
196	if (!par->cmap_adr)
197		return 0;
198
199	if (!par->blanked)
200		if (!blank)
201			return 0;
202
203	par->blanked = blank;
204
205	if (blank)
206		for (i = 0; i < 256; i++) {
207			switch (par->cmap_type) {
208			case cmap_simple:
209				writeb(i, par->cmap_adr);
210				for (j = 0; j < 3; j++)
211					writeb(0, par->cmap_data);
212				break;
213			case cmap_M3A:
214				/* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
215				out_le32(par->cmap_adr + 0x58,
216					 in_le32(par->cmap_adr + 0x58) & ~0x20);
217			case cmap_r128:
218				/* Set palette index & data */
219				out_8(par->cmap_adr + 0xb0, i);
220				out_le32(par->cmap_adr + 0xb4, 0);
221				break;
222			case cmap_M3B:
223				/* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
224				out_le32(par->cmap_adr + 0x58,
225					 in_le32(par->cmap_adr + 0x58) | 0x20);
226				/* Set palette index & data */
227				out_8(par->cmap_adr + 0xb0, i);
228				out_le32(par->cmap_adr + 0xb4, 0);
229				break;
230			case cmap_radeon:
231				out_8(par->cmap_adr + 0xb0, i);
232				out_le32(par->cmap_adr + 0xb4, 0);
233				break;
234			case cmap_gxt2000:
235				out_le32(((unsigned __iomem *) par->cmap_adr) + i,
236					 0);
237				break;
238			case cmap_avivo:
239				writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
240				writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
241				writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
242				writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
243				writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
244				writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
245				break;
246			}
247	} else
248		fb_set_cmap(&info->cmap, info);
249	return 0;
250}
251
252static int offb_set_par(struct fb_info *info)
253{
254	struct offb_par *par = (struct offb_par *) info->par;
255
256	/* On avivo, initialize palette control */
257	if (par->cmap_type == cmap_avivo) {
258		writel(0, par->cmap_adr + AVIVO_DC_LUTA_CONTROL);
259		writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_BLUE);
260		writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_GREEN);
261		writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_RED);
262		writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_BLUE);
263		writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_GREEN);
264		writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_RED);
265		writel(0, par->cmap_adr + AVIVO_DC_LUTB_CONTROL);
266		writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_BLUE);
267		writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_GREEN);
268		writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_RED);
269		writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_BLUE);
270		writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_GREEN);
271		writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_RED);
272		writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
273		writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
274		writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
275		writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
276		writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
277		writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
278	}
279	return 0;
280}
281
282static void offb_destroy(struct fb_info *info)
283{
284	if (info->screen_base)
285		iounmap(info->screen_base);
286	release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
287	framebuffer_release(info);
288}
289
290static struct fb_ops offb_ops = {
291	.owner		= THIS_MODULE,
292	.fb_destroy	= offb_destroy,
293	.fb_setcolreg	= offb_setcolreg,
294	.fb_set_par	= offb_set_par,
295	.fb_blank	= offb_blank,
296	.fb_fillrect	= cfb_fillrect,
297	.fb_copyarea	= cfb_copyarea,
298	.fb_imageblit	= cfb_imageblit,
299};
300
301static void __iomem *offb_map_reg(struct device_node *np, int index,
302				  unsigned long offset, unsigned long size)
303{
304	const u32 *addrp;
305	u64 asize, taddr;
306	unsigned int flags;
307
308	addrp = of_get_pci_address(np, index, &asize, &flags);
309	if (addrp == NULL)
310		addrp = of_get_address(np, index, &asize, &flags);
311	if (addrp == NULL)
312		return NULL;
313	if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
314		return NULL;
315	if ((offset + size) > asize)
316		return NULL;
317	taddr = of_translate_address(np, addrp);
318	if (taddr == OF_BAD_ADDR)
319		return NULL;
320	return ioremap(taddr + offset, size);
321}
322
323static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp,
324				    const char *name, unsigned long address)
325{
326	struct offb_par *par = (struct offb_par *) info->par;
327
328	if (dp && !strncmp(name, "ATY,Rage128", 11)) {
329		par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
330		if (par->cmap_adr)
331			par->cmap_type = cmap_r128;
332	} else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
333			  || !strncmp(name, "ATY,RageM3p12A", 14))) {
334		par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
335		if (par->cmap_adr)
336			par->cmap_type = cmap_M3A;
337	} else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
338		par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
339		if (par->cmap_adr)
340			par->cmap_type = cmap_M3B;
341	} else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
342		par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff);
343		if (par->cmap_adr)
344			par->cmap_type = cmap_radeon;
345	} else if (!strncmp(name, "ATY,", 4)) {
346		unsigned long base = address & 0xff000000UL;
347		par->cmap_adr =
348			ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
349		par->cmap_data = par->cmap_adr + 1;
350		par->cmap_type = cmap_simple;
351	} else if (dp && (of_device_is_compatible(dp, "pci1014,b7") ||
352			  of_device_is_compatible(dp, "pci1014,21c"))) {
353		par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000);
354		if (par->cmap_adr)
355			par->cmap_type = cmap_gxt2000;
356	} else if (dp && !strncmp(name, "vga,Display-", 12)) {
357		/* Look for AVIVO initialized by SLOF */
358		struct device_node *pciparent = of_get_parent(dp);
359		const u32 *vid, *did;
360		vid = of_get_property(pciparent, "vendor-id", NULL);
361		did = of_get_property(pciparent, "device-id", NULL);
362		/* This will match most R5xx */
363		if (vid && did && *vid == 0x1002 &&
364		    ((*did >= 0x7100 && *did < 0x7800) ||
365		     (*did >= 0x9400))) {
366			par->cmap_adr = offb_map_reg(pciparent, 2, 0, 0x10000);
367			if (par->cmap_adr)
368				par->cmap_type = cmap_avivo;
369		}
370		of_node_put(pciparent);
371	} else if (dp && of_device_is_compatible(dp, "qemu,std-vga")) {
372		const u32 io_of_addr[3] = { 0x01000000, 0x0, 0x0 };
373		u64 io_addr = of_translate_address(dp, io_of_addr);
374		if (io_addr != OF_BAD_ADDR) {
375			par->cmap_adr = ioremap(io_addr + 0x3c8, 2);
376			if (par->cmap_adr) {
377				par->cmap_type = cmap_simple;
378				par->cmap_data = par->cmap_adr + 1;
379			}
380		}
381	}
382	info->fix.visual = (par->cmap_type != cmap_unknown) ?
383		FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
384}
385
386static void __init offb_init_fb(const char *name, const char *full_name,
387				int width, int height, int depth,
388				int pitch, unsigned long address,
389				int foreign_endian, struct device_node *dp)
390{
391	unsigned long res_size = pitch * height;
392	struct offb_par *par = &default_par;
393	unsigned long res_start = address;
394	struct fb_fix_screeninfo *fix;
395	struct fb_var_screeninfo *var;
396	struct fb_info *info;
397
398	if (!request_mem_region(res_start, res_size, "offb"))
399		return;
400
401	printk(KERN_INFO
402	       "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
403	       width, height, name, address, depth, pitch);
404	if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
405		printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
406		       depth);
407		release_mem_region(res_start, res_size);
408		return;
409	}
410
411	info = framebuffer_alloc(sizeof(u32) * 16, NULL);
412	
413	if (info == 0) {
414		release_mem_region(res_start, res_size);
415		return;
416	}
417
418	fix = &info->fix;
419	var = &info->var;
420	info->par = par;
421
422	strcpy(fix->id, "OFfb ");
423	strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
424	fix->id[sizeof(fix->id) - 1] = '\0';
425
426	var->xres = var->xres_virtual = width;
427	var->yres = var->yres_virtual = height;
428	fix->line_length = pitch;
429
430	fix->smem_start = address;
431	fix->smem_len = pitch * height;
432	fix->type = FB_TYPE_PACKED_PIXELS;
433	fix->type_aux = 0;
434
435	par->cmap_type = cmap_unknown;
436	if (depth == 8)
437		offb_init_palette_hacks(info, dp, name, address);
438	else
439		fix->visual = FB_VISUAL_TRUECOLOR;
440
441	var->xoffset = var->yoffset = 0;
442	switch (depth) {
443	case 8:
444		var->bits_per_pixel = 8;
445		var->red.offset = 0;
446		var->red.length = 8;
447		var->green.offset = 0;
448		var->green.length = 8;
449		var->blue.offset = 0;
450		var->blue.length = 8;
451		var->transp.offset = 0;
452		var->transp.length = 0;
453		break;
454	case 15:		/* RGB 555 */
455		var->bits_per_pixel = 16;
456		var->red.offset = 10;
457		var->red.length = 5;
458		var->green.offset = 5;
459		var->green.length = 5;
460		var->blue.offset = 0;
461		var->blue.length = 5;
462		var->transp.offset = 0;
463		var->transp.length = 0;
464		break;
465	case 16:		/* RGB 565 */
466		var->bits_per_pixel = 16;
467		var->red.offset = 11;
468		var->red.length = 5;
469		var->green.offset = 5;
470		var->green.length = 6;
471		var->blue.offset = 0;
472		var->blue.length = 5;
473		var->transp.offset = 0;
474		var->transp.length = 0;
475		break;
476	case 32:		/* RGB 888 */
477		var->bits_per_pixel = 32;
478		var->red.offset = 16;
479		var->red.length = 8;
480		var->green.offset = 8;
481		var->green.length = 8;
482		var->blue.offset = 0;
483		var->blue.length = 8;
484		var->transp.offset = 24;
485		var->transp.length = 8;
486		break;
487	}
488	var->red.msb_right = var->green.msb_right = var->blue.msb_right =
489	    var->transp.msb_right = 0;
490	var->grayscale = 0;
491	var->nonstd = 0;
492	var->activate = 0;
493	var->height = var->width = -1;
494	var->pixclock = 10000;
495	var->left_margin = var->right_margin = 16;
496	var->upper_margin = var->lower_margin = 16;
497	var->hsync_len = var->vsync_len = 8;
498	var->sync = 0;
499	var->vmode = FB_VMODE_NONINTERLACED;
500
501	/* set offb aperture size for generic probing */
502	info->apertures = alloc_apertures(1);
503	if (!info->apertures)
504		goto out_aper;
505	info->apertures->ranges[0].base = address;
506	info->apertures->ranges[0].size = fix->smem_len;
507
508	info->fbops = &offb_ops;
509	info->screen_base = ioremap(address, fix->smem_len);
510	info->pseudo_palette = (void *) (info + 1);
511	info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE | foreign_endian;
512
513	fb_alloc_cmap(&info->cmap, 256, 0);
514
515	if (register_framebuffer(info) < 0)
516		goto out_err;
517
518	printk(KERN_INFO "fb%d: Open Firmware frame buffer device on %s\n",
519	       info->node, full_name);
520	return;
521
522out_err:
523	iounmap(info->screen_base);
524out_aper:
525	iounmap(par->cmap_adr);
526	par->cmap_adr = NULL;
527	framebuffer_release(info);
528	release_mem_region(res_start, res_size);
529}
530
531
532static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
533{
534	unsigned int len;
535	int i, width = 640, height = 480, depth = 8, pitch = 640;
536	unsigned int flags, rsize, addr_prop = 0;
537	unsigned long max_size = 0;
538	u64 rstart, address = OF_BAD_ADDR;
539	const u32 *pp, *addrp, *up;
540	u64 asize;
541	int foreign_endian = 0;
542
543#ifdef __BIG_ENDIAN
544	if (of_get_property(dp, "little-endian", NULL))
545		foreign_endian = FBINFO_FOREIGN_ENDIAN;
546#else
547	if (of_get_property(dp, "big-endian", NULL))
548		foreign_endian = FBINFO_FOREIGN_ENDIAN;
549#endif
550
551	pp = of_get_property(dp, "linux,bootx-depth", &len);
552	if (pp == NULL)
553		pp = of_get_property(dp, "depth", &len);
554	if (pp && len == sizeof(u32))
555		depth = *pp;
556
557	pp = of_get_property(dp, "linux,bootx-width", &len);
558	if (pp == NULL)
559		pp = of_get_property(dp, "width", &len);
560	if (pp && len == sizeof(u32))
561		width = *pp;
562
563	pp = of_get_property(dp, "linux,bootx-height", &len);
564	if (pp == NULL)
565		pp = of_get_property(dp, "height", &len);
566	if (pp && len == sizeof(u32))
567		height = *pp;
568
569	pp = of_get_property(dp, "linux,bootx-linebytes", &len);
570	if (pp == NULL)
571		pp = of_get_property(dp, "linebytes", &len);
572	if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
573		pitch = *pp;
574	else
575		pitch = width * ((depth + 7) / 8);
576
577	rsize = (unsigned long)pitch * (unsigned long)height;
578
579	/* Ok, now we try to figure out the address of the framebuffer.
580	 *
581	 * Unfortunately, Open Firmware doesn't provide a standard way to do
582	 * so. All we can do is a dodgy heuristic that happens to work in
583	 * practice. On most machines, the "address" property contains what
584	 * we need, though not on Matrox cards found in IBM machines. What I've
585	 * found that appears to give good results is to go through the PCI
586	 * ranges and pick one that is both big enough and if possible encloses
587	 * the "address" property. If none match, we pick the biggest
588	 */
589	up = of_get_property(dp, "linux,bootx-addr", &len);
590	if (up == NULL)
591		up = of_get_property(dp, "address", &len);
592	if (up && len == sizeof(u32))
593		addr_prop = *up;
594
595	/* Hack for when BootX is passing us */
596	if (no_real_node)
597		goto skip_addr;
598
599	for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
600		     != NULL; i++) {
601		int match_addrp = 0;
602
603		if (!(flags & IORESOURCE_MEM))
604			continue;
605		if (asize < rsize)
606			continue;
607		rstart = of_translate_address(dp, addrp);
608		if (rstart == OF_BAD_ADDR)
609			continue;
610		if (addr_prop && (rstart <= addr_prop) &&
611		    ((rstart + asize) >= (addr_prop + rsize)))
612			match_addrp = 1;
613		if (match_addrp) {
614			address = addr_prop;
615			break;
616		}
617		if (rsize > max_size) {
618			max_size = rsize;
619			address = OF_BAD_ADDR;
620 		}
621
622		if (address == OF_BAD_ADDR)
623			address = rstart;
624	}
625 skip_addr:
626	if (address == OF_BAD_ADDR && addr_prop)
627		address = (u64)addr_prop;
628	if (address != OF_BAD_ADDR) {
629		/* kludge for valkyrie */
630		if (strcmp(dp->name, "valkyrie") == 0)
631			address += 0x1000;
632		offb_init_fb(no_real_node ? "bootx" : dp->name,
633			     no_real_node ? "display" : dp->full_name,
634			     width, height, depth, pitch, address,
635			     foreign_endian, no_real_node ? NULL : dp);
636	}
637}
638
639static int __init offb_init(void)
640{
641	struct device_node *dp = NULL, *boot_disp = NULL;
642
643	if (fb_get_options("offb", NULL))
644		return -ENODEV;
645
646	/* Check if we have a MacOS display without a node spec */
647	if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) {
648		/* The old code tried to work out which node was the MacOS
649		 * display based on the address. I'm dropping that since the
650		 * lack of a node spec only happens with old BootX versions
651		 * (users can update) and with this code, they'll still get
652		 * a display (just not the palette hacks).
653		 */
654		offb_init_nodriver(of_chosen, 1);
655	}
656
657	for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
658		if (of_get_property(dp, "linux,opened", NULL) &&
659		    of_get_property(dp, "linux,boot-display", NULL)) {
660			boot_disp = dp;
661			offb_init_nodriver(dp, 0);
662		}
663	}
664	for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
665		if (of_get_property(dp, "linux,opened", NULL) &&
666		    dp != boot_disp)
667			offb_init_nodriver(dp, 0);
668	}
669
670	return 0;
671}
672
673
674module_init(offb_init);
675MODULE_LICENSE("GPL");