e1d9eeb1aeafe432f1e240e4bf30d895cc72c80d
[sfrench/cifs-2.6.git] / drivers / video / offb.c
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/slab.h>
21 #include <linux/vmalloc.h>
22 #include <linux/delay.h>
23 #include <linux/interrupt.h>
24 #include <linux/fb.h>
25 #include <linux/init.h>
26 #include <linux/ioport.h>
27 #include <linux/pci.h>
28 #include <asm/io.h>
29 #include <asm/prom.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 */
42 enum {
43         cmap_unknown,
44         cmap_m64,               /* 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 };
52
53 struct offb_par {
54         volatile void __iomem *cmap_adr;
55         volatile void __iomem *cmap_data;
56         int cmap_type;
57         int blanked;
58 };
59
60 struct offb_par default_par;
61
62 #ifdef CONFIG_PPC32
63 extern boot_infos_t *boot_infos;
64 #endif
65
66 /* Definitions used by the Avivo palette hack */
67 #define AVIVO_DC_LUT_RW_SELECT                  0x6480
68 #define AVIVO_DC_LUT_RW_MODE                    0x6484
69 #define AVIVO_DC_LUT_RW_INDEX                   0x6488
70 #define AVIVO_DC_LUT_SEQ_COLOR                  0x648c
71 #define AVIVO_DC_LUT_PWL_DATA                   0x6490
72 #define AVIVO_DC_LUT_30_COLOR                   0x6494
73 #define AVIVO_DC_LUT_READ_PIPE_SELECT           0x6498
74 #define AVIVO_DC_LUT_WRITE_EN_MASK              0x649c
75 #define AVIVO_DC_LUT_AUTOFILL                   0x64a0
76
77 #define AVIVO_DC_LUTA_CONTROL                   0x64c0
78 #define AVIVO_DC_LUTA_BLACK_OFFSET_BLUE         0x64c4
79 #define AVIVO_DC_LUTA_BLACK_OFFSET_GREEN        0x64c8
80 #define AVIVO_DC_LUTA_BLACK_OFFSET_RED          0x64cc
81 #define AVIVO_DC_LUTA_WHITE_OFFSET_BLUE         0x64d0
82 #define AVIVO_DC_LUTA_WHITE_OFFSET_GREEN        0x64d4
83 #define AVIVO_DC_LUTA_WHITE_OFFSET_RED          0x64d8
84
85 #define AVIVO_DC_LUTB_CONTROL                   0x6cc0
86 #define AVIVO_DC_LUTB_BLACK_OFFSET_BLUE         0x6cc4
87 #define AVIVO_DC_LUTB_BLACK_OFFSET_GREEN        0x6cc8
88 #define AVIVO_DC_LUTB_BLACK_OFFSET_RED          0x6ccc
89 #define AVIVO_DC_LUTB_WHITE_OFFSET_BLUE         0x6cd0
90 #define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN        0x6cd4
91 #define AVIVO_DC_LUTB_WHITE_OFFSET_RED          0x6cd8
92
93     /*
94      *  Set a single color register. The values supplied are already
95      *  rounded down to the hardware's capabilities (according to the
96      *  entries in the var structure). Return != 0 for invalid regno.
97      */
98
99 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
100                           u_int transp, struct fb_info *info)
101 {
102         struct offb_par *par = (struct offb_par *) info->par;
103         int i, depth;
104         u32 *pal = info->pseudo_palette;
105
106         depth = info->var.bits_per_pixel;
107         if (depth == 16)
108                 depth = (info->var.green.length == 5) ? 15 : 16;
109
110         if (regno > 255 ||
111             (depth == 16 && regno > 63) ||
112             (depth == 15 && regno > 31))
113                 return 1;
114
115         if (regno < 16) {
116                 switch (depth) {
117                 case 15:
118                         pal[regno] = (regno << 10) | (regno << 5) | regno;
119                         break;
120                 case 16:
121                         pal[regno] = (regno << 11) | (regno << 5) | regno;
122                         break;
123                 case 24:
124                         pal[regno] = (regno << 16) | (regno << 8) | regno;
125                         break;
126                 case 32:
127                         i = (regno << 8) | regno;
128                         pal[regno] = (i << 16) | i;
129                         break;
130                 }
131         }
132
133         red >>= 8;
134         green >>= 8;
135         blue >>= 8;
136
137         if (!par->cmap_adr)
138                 return 0;
139
140         switch (par->cmap_type) {
141         case cmap_m64:
142                 writeb(regno, par->cmap_adr);
143                 writeb(red, par->cmap_data);
144                 writeb(green, par->cmap_data);
145                 writeb(blue, par->cmap_data);
146                 break;
147         case cmap_M3A:
148                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
149                 out_le32(par->cmap_adr + 0x58,
150                          in_le32(par->cmap_adr + 0x58) & ~0x20);
151         case cmap_r128:
152                 /* Set palette index & data */
153                 out_8(par->cmap_adr + 0xb0, regno);
154                 out_le32(par->cmap_adr + 0xb4,
155                          (red << 16 | green << 8 | blue));
156                 break;
157         case cmap_M3B:
158                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
159                 out_le32(par->cmap_adr + 0x58,
160                          in_le32(par->cmap_adr + 0x58) | 0x20);
161                 /* Set palette index & data */
162                 out_8(par->cmap_adr + 0xb0, regno);
163                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
164                 break;
165         case cmap_radeon:
166                 /* Set palette index & data (could be smarter) */
167                 out_8(par->cmap_adr + 0xb0, regno);
168                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
169                 break;
170         case cmap_gxt2000:
171                 out_le32(((unsigned __iomem *) par->cmap_adr) + regno,
172                          (red << 16 | green << 8 | blue));
173                 break;
174         case cmap_avivo:
175                 /* Write to both LUTs for now */
176                 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
177                 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
178                 writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
179                        par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
180                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
181                 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
182                 writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
183                        par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
184                 break;
185         }
186
187         return 0;
188 }
189
190     /*
191      *  Blank the display.
192      */
193
194 static int offb_blank(int blank, struct fb_info *info)
195 {
196         struct offb_par *par = (struct offb_par *) info->par;
197         int i, j;
198
199         if (!par->cmap_adr)
200                 return 0;
201
202         if (!par->blanked)
203                 if (!blank)
204                         return 0;
205
206         par->blanked = blank;
207
208         if (blank)
209                 for (i = 0; i < 256; i++) {
210                         switch (par->cmap_type) {
211                         case cmap_m64:
212                                 writeb(i, par->cmap_adr);
213                                 for (j = 0; j < 3; j++)
214                                         writeb(0, par->cmap_data);
215                                 break;
216                         case cmap_M3A:
217                                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
218                                 out_le32(par->cmap_adr + 0x58,
219                                          in_le32(par->cmap_adr + 0x58) & ~0x20);
220                         case cmap_r128:
221                                 /* Set palette index & data */
222                                 out_8(par->cmap_adr + 0xb0, i);
223                                 out_le32(par->cmap_adr + 0xb4, 0);
224                                 break;
225                         case cmap_M3B:
226                                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
227                                 out_le32(par->cmap_adr + 0x58,
228                                          in_le32(par->cmap_adr + 0x58) | 0x20);
229                                 /* Set palette index & data */
230                                 out_8(par->cmap_adr + 0xb0, i);
231                                 out_le32(par->cmap_adr + 0xb4, 0);
232                                 break;
233                         case cmap_radeon:
234                                 out_8(par->cmap_adr + 0xb0, i);
235                                 out_le32(par->cmap_adr + 0xb4, 0);
236                                 break;
237                         case cmap_gxt2000:
238                                 out_le32(((unsigned __iomem *) par->cmap_adr) + i,
239                                          0);
240                                 break;
241                         case cmap_avivo:
242                                 writel(1, 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                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
246                                 writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
247                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
248                                 break;
249                         }
250         } else
251                 fb_set_cmap(&info->cmap, info);
252         return 0;
253 }
254
255 static int offb_set_par(struct fb_info *info)
256 {
257         struct offb_par *par = (struct offb_par *) info->par;
258
259         /* On avivo, initialize palette control */
260         if (par->cmap_type == cmap_avivo) {
261                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_CONTROL);
262                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_BLUE);
263                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_GREEN);
264                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_RED);
265                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_BLUE);
266                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_GREEN);
267                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_RED);
268                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_CONTROL);
269                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_BLUE);
270                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_GREEN);
271                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_RED);
272                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_BLUE);
273                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_GREEN);
274                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_RED);
275                 writel(1, 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                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
279                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
280                 writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
281         }
282         return 0;
283 }
284
285 static struct fb_ops offb_ops = {
286         .owner          = THIS_MODULE,
287         .fb_setcolreg   = offb_setcolreg,
288         .fb_set_par     = offb_set_par,
289         .fb_blank       = offb_blank,
290         .fb_fillrect    = cfb_fillrect,
291         .fb_copyarea    = cfb_copyarea,
292         .fb_imageblit   = cfb_imageblit,
293 };
294
295 static void __iomem *offb_map_reg(struct device_node *np, int index,
296                                   unsigned long offset, unsigned long size)
297 {
298         const u32 *addrp;
299         u64 asize, taddr;
300         unsigned int flags;
301
302         addrp = of_get_pci_address(np, index, &asize, &flags);
303         if (addrp == NULL)
304                 addrp = of_get_address(np, index, &asize, &flags);
305         if (addrp == NULL)
306                 return NULL;
307         if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
308                 return NULL;
309         if ((offset + size) > asize)
310                 return NULL;
311         taddr = of_translate_address(np, addrp);
312         if (taddr == OF_BAD_ADDR)
313                 return NULL;
314         return ioremap(taddr + offset, size);
315 }
316
317 static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp,
318                                     const char *name, unsigned long address)
319 {
320         struct offb_par *par = (struct offb_par *) info->par;
321
322         if (dp && !strncmp(name, "ATY,Rage128", 11)) {
323                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
324                 if (par->cmap_adr)
325                         par->cmap_type = cmap_r128;
326         } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
327                           || !strncmp(name, "ATY,RageM3p12A", 14))) {
328                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
329                 if (par->cmap_adr)
330                         par->cmap_type = cmap_M3A;
331         } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
332                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
333                 if (par->cmap_adr)
334                         par->cmap_type = cmap_M3B;
335         } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
336                 par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff);
337                 if (par->cmap_adr)
338                         par->cmap_type = cmap_radeon;
339         } else if (!strncmp(name, "ATY,", 4)) {
340                 unsigned long base = address & 0xff000000UL;
341                 par->cmap_adr =
342                         ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
343                 par->cmap_data = par->cmap_adr + 1;
344                 par->cmap_type = cmap_m64;
345         } else if (dp && (of_device_is_compatible(dp, "pci1014,b7") ||
346                           of_device_is_compatible(dp, "pci1014,21c"))) {
347                 par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000);
348                 if (par->cmap_adr)
349                         par->cmap_type = cmap_gxt2000;
350         } else if (dp && !strncmp(name, "vga,Display-", 12)) {
351                 /* Look for AVIVO initialized by SLOF */
352                 struct device_node *pciparent = of_get_parent(dp);
353                 const u32 *vid, *did;
354                 vid = of_get_property(pciparent, "vendor-id", NULL);
355                 did = of_get_property(pciparent, "device-id", NULL);
356                 /* This will match most R5xx */
357                 if (vid && did && *vid == 0x1002 &&
358                     ((*did >= 0x7100 && *did < 0x7800) ||
359                      (*did >= 0x9400))) {
360                         par->cmap_adr = offb_map_reg(pciparent, 2, 0, 0x10000);
361                         if (par->cmap_adr)
362                                 par->cmap_type = cmap_avivo;
363                 }
364                 of_node_put(pciparent);
365         }
366         info->fix.visual = (par->cmap_type != cmap_unknown) ?
367                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
368 }
369
370 static void __init offb_init_fb(const char *name, const char *full_name,
371                                 int width, int height, int depth,
372                                 int pitch, unsigned long address,
373                                 int foreign_endian, struct device_node *dp)
374 {
375         unsigned long res_size = pitch * height * (depth + 7) / 8;
376         struct offb_par *par = &default_par;
377         unsigned long res_start = address;
378         struct fb_fix_screeninfo *fix;
379         struct fb_var_screeninfo *var;
380         struct fb_info *info;
381         int size;
382
383         if (!request_mem_region(res_start, res_size, "offb"))
384                 return;
385
386         printk(KERN_INFO
387                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
388                width, height, name, address, depth, pitch);
389         if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
390                 printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
391                        depth);
392                 release_mem_region(res_start, res_size);
393                 return;
394         }
395
396         size = sizeof(struct fb_info) + sizeof(u32) * 16;
397
398         info = kmalloc(size, GFP_ATOMIC);
399         
400         if (info == 0) {
401                 release_mem_region(res_start, res_size);
402                 return;
403         }
404         memset(info, 0, size);
405
406         fix = &info->fix;
407         var = &info->var;
408         info->par = par;
409
410         strcpy(fix->id, "OFfb ");
411         strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
412         fix->id[sizeof(fix->id) - 1] = '\0';
413
414         var->xres = var->xres_virtual = width;
415         var->yres = var->yres_virtual = height;
416         fix->line_length = pitch;
417
418         fix->smem_start = address;
419         fix->smem_len = pitch * height;
420         fix->type = FB_TYPE_PACKED_PIXELS;
421         fix->type_aux = 0;
422
423         par->cmap_type = cmap_unknown;
424         if (depth == 8)
425                 offb_init_palette_hacks(info, dp, name, address);
426         else
427                 fix->visual = FB_VISUAL_TRUECOLOR;
428
429         var->xoffset = var->yoffset = 0;
430         switch (depth) {
431         case 8:
432                 var->bits_per_pixel = 8;
433                 var->red.offset = 0;
434                 var->red.length = 8;
435                 var->green.offset = 0;
436                 var->green.length = 8;
437                 var->blue.offset = 0;
438                 var->blue.length = 8;
439                 var->transp.offset = 0;
440                 var->transp.length = 0;
441                 break;
442         case 15:                /* RGB 555 */
443                 var->bits_per_pixel = 16;
444                 var->red.offset = 10;
445                 var->red.length = 5;
446                 var->green.offset = 5;
447                 var->green.length = 5;
448                 var->blue.offset = 0;
449                 var->blue.length = 5;
450                 var->transp.offset = 0;
451                 var->transp.length = 0;
452                 break;
453         case 16:                /* RGB 565 */
454                 var->bits_per_pixel = 16;
455                 var->red.offset = 11;
456                 var->red.length = 5;
457                 var->green.offset = 5;
458                 var->green.length = 6;
459                 var->blue.offset = 0;
460                 var->blue.length = 5;
461                 var->transp.offset = 0;
462                 var->transp.length = 0;
463                 break;
464         case 32:                /* RGB 888 */
465                 var->bits_per_pixel = 32;
466                 var->red.offset = 16;
467                 var->red.length = 8;
468                 var->green.offset = 8;
469                 var->green.length = 8;
470                 var->blue.offset = 0;
471                 var->blue.length = 8;
472                 var->transp.offset = 24;
473                 var->transp.length = 8;
474                 break;
475         }
476         var->red.msb_right = var->green.msb_right = var->blue.msb_right =
477             var->transp.msb_right = 0;
478         var->grayscale = 0;
479         var->nonstd = 0;
480         var->activate = 0;
481         var->height = var->width = -1;
482         var->pixclock = 10000;
483         var->left_margin = var->right_margin = 16;
484         var->upper_margin = var->lower_margin = 16;
485         var->hsync_len = var->vsync_len = 8;
486         var->sync = 0;
487         var->vmode = FB_VMODE_NONINTERLACED;
488
489         info->fbops = &offb_ops;
490         info->screen_base = ioremap(address, fix->smem_len);
491         info->pseudo_palette = (void *) (info + 1);
492         info->flags = FBINFO_DEFAULT | foreign_endian;
493
494         fb_alloc_cmap(&info->cmap, 256, 0);
495
496         if (register_framebuffer(info) < 0) {
497                 iounmap(par->cmap_adr);
498                 par->cmap_adr = NULL;
499                 iounmap(info->screen_base);
500                 kfree(info);
501                 release_mem_region(res_start, res_size);
502                 return;
503         }
504
505         printk(KERN_INFO "fb%d: Open Firmware frame buffer device on %s\n",
506                info->node, full_name);
507 }
508
509
510 static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
511 {
512         unsigned int len;
513         int i, width = 640, height = 480, depth = 8, pitch = 640;
514         unsigned int flags, rsize, addr_prop = 0;
515         unsigned long max_size = 0;
516         u64 rstart, address = OF_BAD_ADDR;
517         const u32 *pp, *addrp, *up;
518         u64 asize;
519         int foreign_endian = 0;
520
521 #ifdef __BIG_ENDIAN
522         if (of_get_property(dp, "little-endian", NULL))
523                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
524 #else
525         if (of_get_property(dp, "big-endian", NULL))
526                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
527 #endif
528
529         pp = of_get_property(dp, "linux,bootx-depth", &len);
530         if (pp == NULL)
531                 pp = of_get_property(dp, "depth", &len);
532         if (pp && len == sizeof(u32))
533                 depth = *pp;
534
535         pp = of_get_property(dp, "linux,bootx-width", &len);
536         if (pp == NULL)
537                 pp = of_get_property(dp, "width", &len);
538         if (pp && len == sizeof(u32))
539                 width = *pp;
540
541         pp = of_get_property(dp, "linux,bootx-height", &len);
542         if (pp == NULL)
543                 pp = of_get_property(dp, "height", &len);
544         if (pp && len == sizeof(u32))
545                 height = *pp;
546
547         pp = of_get_property(dp, "linux,bootx-linebytes", &len);
548         if (pp == NULL)
549                 pp = of_get_property(dp, "linebytes", &len);
550         if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
551                 pitch = *pp;
552         else
553                 pitch = width * ((depth + 7) / 8);
554
555         rsize = (unsigned long)pitch * (unsigned long)height;
556
557         /* Ok, now we try to figure out the address of the framebuffer.
558          *
559          * Unfortunately, Open Firmware doesn't provide a standard way to do
560          * so. All we can do is a dodgy heuristic that happens to work in
561          * practice. On most machines, the "address" property contains what
562          * we need, though not on Matrox cards found in IBM machines. What I've
563          * found that appears to give good results is to go through the PCI
564          * ranges and pick one that is both big enough and if possible encloses
565          * the "address" property. If none match, we pick the biggest
566          */
567         up = of_get_property(dp, "linux,bootx-addr", &len);
568         if (up == NULL)
569                 up = of_get_property(dp, "address", &len);
570         if (up && len == sizeof(u32))
571                 addr_prop = *up;
572
573         /* Hack for when BootX is passing us */
574         if (no_real_node)
575                 goto skip_addr;
576
577         for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
578                      != NULL; i++) {
579                 int match_addrp = 0;
580
581                 if (!(flags & IORESOURCE_MEM))
582                         continue;
583                 if (asize < rsize)
584                         continue;
585                 rstart = of_translate_address(dp, addrp);
586                 if (rstart == OF_BAD_ADDR)
587                         continue;
588                 if (addr_prop && (rstart <= addr_prop) &&
589                     ((rstart + asize) >= (addr_prop + rsize)))
590                         match_addrp = 1;
591                 if (match_addrp) {
592                         address = addr_prop;
593                         break;
594                 }
595                 if (rsize > max_size) {
596                         max_size = rsize;
597                         address = OF_BAD_ADDR;
598                 }
599
600                 if (address == OF_BAD_ADDR)
601                         address = rstart;
602         }
603  skip_addr:
604         if (address == OF_BAD_ADDR && addr_prop)
605                 address = (u64)addr_prop;
606         if (address != OF_BAD_ADDR) {
607                 /* kludge for valkyrie */
608                 if (strcmp(dp->name, "valkyrie") == 0)
609                         address += 0x1000;
610                 offb_init_fb(no_real_node ? "bootx" : dp->name,
611                              no_real_node ? "display" : dp->full_name,
612                              width, height, depth, pitch, address,
613                              foreign_endian, no_real_node ? NULL : dp);
614         }
615 }
616
617 static int __init offb_init(void)
618 {
619         struct device_node *dp = NULL, *boot_disp = NULL;
620
621         if (fb_get_options("offb", NULL))
622                 return -ENODEV;
623
624         /* Check if we have a MacOS display without a node spec */
625         if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) {
626                 /* The old code tried to work out which node was the MacOS
627                  * display based on the address. I'm dropping that since the
628                  * lack of a node spec only happens with old BootX versions
629                  * (users can update) and with this code, they'll still get
630                  * a display (just not the palette hacks).
631                  */
632                 offb_init_nodriver(of_chosen, 1);
633         }
634
635         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
636                 if (of_get_property(dp, "linux,opened", NULL) &&
637                     of_get_property(dp, "linux,boot-display", NULL)) {
638                         boot_disp = dp;
639                         offb_init_nodriver(dp, 0);
640                 }
641         }
642         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
643                 if (of_get_property(dp, "linux,opened", NULL) &&
644                     dp != boot_disp)
645                         offb_init_nodriver(dp, 0);
646         }
647
648         return 0;
649 }
650
651
652 module_init(offb_init);
653 MODULE_LICENSE("GPL");