xref: /openbmc/linux/drivers/video/fbdev/offb.c (revision 4bb1eb3c)
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 const 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");
696