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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 */
42 enum {
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
54 struct offb_par {
55         volatile void __iomem *cmap_adr;
56         volatile void __iomem *cmap_data;
57         int cmap_type;
58         int blanked;
59 };
60
61 struct offb_par default_par;
62
63 #ifdef CONFIG_PPC32
64 extern 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
100 static 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
191 static 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
252 static 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
282 static 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
290 static 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
301 static void __iomem *offb_map_reg(struct device_node *np, int index,
302                                   unsigned long offset, unsigned long size)
303 {
304         const __be32 *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
323 static 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 #ifdef __BIG_ENDIAN
373                 const __be32 io_of_addr[3] = { 0x01000000, 0x0, 0x0 };
374 #else
375                 const __be32 io_of_addr[3] = { 0x00000001, 0x0, 0x0 };
376 #endif
377                 u64 io_addr = of_translate_address(dp, io_of_addr);
378                 if (io_addr != OF_BAD_ADDR) {
379                         par->cmap_adr = ioremap(io_addr + 0x3c8, 2);
380                         if (par->cmap_adr) {
381                                 par->cmap_type = cmap_simple;
382                                 par->cmap_data = par->cmap_adr + 1;
383                         }
384                 }
385         }
386         info->fix.visual = (par->cmap_type != cmap_unknown) ?
387                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
388 }
389
390 static void __init offb_init_fb(const char *name, const char *full_name,
391                                 int width, int height, int depth,
392                                 int pitch, unsigned long address,
393                                 int foreign_endian, struct device_node *dp)
394 {
395         unsigned long res_size = pitch * height;
396         struct offb_par *par = &default_par;
397         unsigned long res_start = address;
398         struct fb_fix_screeninfo *fix;
399         struct fb_var_screeninfo *var;
400         struct fb_info *info;
401
402         if (!request_mem_region(res_start, res_size, "offb"))
403                 return;
404
405         printk(KERN_INFO
406                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
407                width, height, name, address, depth, pitch);
408         if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
409                 printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
410                        depth);
411                 release_mem_region(res_start, res_size);
412                 return;
413         }
414
415         info = framebuffer_alloc(sizeof(u32) * 16, NULL);
416         
417         if (info == 0) {
418                 release_mem_region(res_start, res_size);
419                 return;
420         }
421
422         fix = &info->fix;
423         var = &info->var;
424         info->par = par;
425
426         strcpy(fix->id, "OFfb ");
427         strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
428         fix->id[sizeof(fix->id) - 1] = '\0';
429
430         var->xres = var->xres_virtual = width;
431         var->yres = var->yres_virtual = height;
432         fix->line_length = pitch;
433
434         fix->smem_start = address;
435         fix->smem_len = pitch * height;
436         fix->type = FB_TYPE_PACKED_PIXELS;
437         fix->type_aux = 0;
438
439         par->cmap_type = cmap_unknown;
440         if (depth == 8)
441                 offb_init_palette_hacks(info, dp, name, address);
442         else
443                 fix->visual = FB_VISUAL_TRUECOLOR;
444
445         var->xoffset = var->yoffset = 0;
446         switch (depth) {
447         case 8:
448                 var->bits_per_pixel = 8;
449                 var->red.offset = 0;
450                 var->red.length = 8;
451                 var->green.offset = 0;
452                 var->green.length = 8;
453                 var->blue.offset = 0;
454                 var->blue.length = 8;
455                 var->transp.offset = 0;
456                 var->transp.length = 0;
457                 break;
458         case 15:                /* RGB 555 */
459                 var->bits_per_pixel = 16;
460                 var->red.offset = 10;
461                 var->red.length = 5;
462                 var->green.offset = 5;
463                 var->green.length = 5;
464                 var->blue.offset = 0;
465                 var->blue.length = 5;
466                 var->transp.offset = 0;
467                 var->transp.length = 0;
468                 break;
469         case 16:                /* RGB 565 */
470                 var->bits_per_pixel = 16;
471                 var->red.offset = 11;
472                 var->red.length = 5;
473                 var->green.offset = 5;
474                 var->green.length = 6;
475                 var->blue.offset = 0;
476                 var->blue.length = 5;
477                 var->transp.offset = 0;
478                 var->transp.length = 0;
479                 break;
480         case 32:                /* RGB 888 */
481                 var->bits_per_pixel = 32;
482                 var->red.offset = 16;
483                 var->red.length = 8;
484                 var->green.offset = 8;
485                 var->green.length = 8;
486                 var->blue.offset = 0;
487                 var->blue.length = 8;
488                 var->transp.offset = 24;
489                 var->transp.length = 8;
490                 break;
491         }
492         var->red.msb_right = var->green.msb_right = var->blue.msb_right =
493             var->transp.msb_right = 0;
494         var->grayscale = 0;
495         var->nonstd = 0;
496         var->activate = 0;
497         var->height = var->width = -1;
498         var->pixclock = 10000;
499         var->left_margin = var->right_margin = 16;
500         var->upper_margin = var->lower_margin = 16;
501         var->hsync_len = var->vsync_len = 8;
502         var->sync = 0;
503         var->vmode = FB_VMODE_NONINTERLACED;
504
505         /* set offb aperture size for generic probing */
506         info->apertures = alloc_apertures(1);
507         if (!info->apertures)
508                 goto out_aper;
509         info->apertures->ranges[0].base = address;
510         info->apertures->ranges[0].size = fix->smem_len;
511
512         info->fbops = &offb_ops;
513         info->screen_base = ioremap(address, fix->smem_len);
514         info->pseudo_palette = (void *) (info + 1);
515         info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE | foreign_endian;
516
517         fb_alloc_cmap(&info->cmap, 256, 0);
518
519         if (register_framebuffer(info) < 0)
520                 goto out_err;
521
522         fb_info(info, "Open Firmware frame buffer device on %s\n", full_name);
523         return;
524
525 out_err:
526         iounmap(info->screen_base);
527 out_aper:
528         iounmap(par->cmap_adr);
529         par->cmap_adr = NULL;
530         framebuffer_release(info);
531         release_mem_region(res_start, res_size);
532 }
533
534
535 static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
536 {
537         unsigned int len;
538         int i, width = 640, height = 480, depth = 8, pitch = 640;
539         unsigned int flags, rsize, addr_prop = 0;
540         unsigned long max_size = 0;
541         u64 rstart, address = OF_BAD_ADDR;
542         const __be32 *pp, *addrp, *up;
543         u64 asize;
544         int foreign_endian = 0;
545
546 #ifdef __BIG_ENDIAN
547         if (of_get_property(dp, "little-endian", NULL))
548                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
549 #else
550         if (of_get_property(dp, "big-endian", NULL))
551                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
552 #endif
553
554         pp = of_get_property(dp, "linux,bootx-depth", &len);
555         if (pp == NULL)
556                 pp = of_get_property(dp, "depth", &len);
557         if (pp && len == sizeof(u32))
558                 depth = be32_to_cpup(pp);
559
560         pp = of_get_property(dp, "linux,bootx-width", &len);
561         if (pp == NULL)
562                 pp = of_get_property(dp, "width", &len);
563         if (pp && len == sizeof(u32))
564                 width = be32_to_cpup(pp);
565
566         pp = of_get_property(dp, "linux,bootx-height", &len);
567         if (pp == NULL)
568                 pp = of_get_property(dp, "height", &len);
569         if (pp && len == sizeof(u32))
570                 height = be32_to_cpup(pp);
571
572         pp = of_get_property(dp, "linux,bootx-linebytes", &len);
573         if (pp == NULL)
574                 pp = of_get_property(dp, "linebytes", &len);
575         if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
576                 pitch = be32_to_cpup(pp);
577         else
578                 pitch = width * ((depth + 7) / 8);
579
580         rsize = (unsigned long)pitch * (unsigned long)height;
581
582         /* Ok, now we try to figure out the address of the framebuffer.
583          *
584          * Unfortunately, Open Firmware doesn't provide a standard way to do
585          * so. All we can do is a dodgy heuristic that happens to work in
586          * practice. On most machines, the "address" property contains what
587          * we need, though not on Matrox cards found in IBM machines. What I've
588          * found that appears to give good results is to go through the PCI
589          * ranges and pick one that is both big enough and if possible encloses
590          * the "address" property. If none match, we pick the biggest
591          */
592         up = of_get_property(dp, "linux,bootx-addr", &len);
593         if (up == NULL)
594                 up = of_get_property(dp, "address", &len);
595         if (up && len == sizeof(u32))
596                 addr_prop = *up;
597
598         /* Hack for when BootX is passing us */
599         if (no_real_node)
600                 goto skip_addr;
601
602         for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
603                      != NULL; i++) {
604                 int match_addrp = 0;
605
606                 if (!(flags & IORESOURCE_MEM))
607                         continue;
608                 if (asize < rsize)
609                         continue;
610                 rstart = of_translate_address(dp, addrp);
611                 if (rstart == OF_BAD_ADDR)
612                         continue;
613                 if (addr_prop && (rstart <= addr_prop) &&
614                     ((rstart + asize) >= (addr_prop + rsize)))
615                         match_addrp = 1;
616                 if (match_addrp) {
617                         address = addr_prop;
618                         break;
619                 }
620                 if (rsize > max_size) {
621                         max_size = rsize;
622                         address = OF_BAD_ADDR;
623                 }
624
625                 if (address == OF_BAD_ADDR)
626                         address = rstart;
627         }
628  skip_addr:
629         if (address == OF_BAD_ADDR && addr_prop)
630                 address = (u64)addr_prop;
631         if (address != OF_BAD_ADDR) {
632                 /* kludge for valkyrie */
633                 if (strcmp(dp->name, "valkyrie") == 0)
634                         address += 0x1000;
635                 offb_init_fb(no_real_node ? "bootx" : dp->name,
636                              no_real_node ? "display" : dp->full_name,
637                              width, height, depth, pitch, address,
638                              foreign_endian, no_real_node ? NULL : dp);
639         }
640 }
641
642 static int __init offb_init(void)
643 {
644         struct device_node *dp = NULL, *boot_disp = NULL;
645
646         if (fb_get_options("offb", NULL))
647                 return -ENODEV;
648
649         /* Check if we have a MacOS display without a node spec */
650         if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) {
651                 /* The old code tried to work out which node was the MacOS
652                  * display based on the address. I'm dropping that since the
653                  * lack of a node spec only happens with old BootX versions
654                  * (users can update) and with this code, they'll still get
655                  * a display (just not the palette hacks).
656                  */
657                 offb_init_nodriver(of_chosen, 1);
658         }
659
660         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
661                 if (of_get_property(dp, "linux,opened", NULL) &&
662                     of_get_property(dp, "linux,boot-display", NULL)) {
663                         boot_disp = dp;
664                         offb_init_nodriver(dp, 0);
665                 }
666         }
667         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
668                 if (of_get_property(dp, "linux,opened", NULL) &&
669                     dp != boot_disp)
670                         offb_init_nodriver(dp, 0);
671         }
672
673         return 0;
674 }
675
676
677 module_init(offb_init);
678 MODULE_LICENSE("GPL");