Merge remote-tracking branch 'grant/devicetree/merge' into dt-fixes
[firefly-linux-kernel-4.4.55.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/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 #define FB_RIGHT_POS(p, bpp)         (fb_be_math(p) ? 0 : (32 - (bpp)))
95
96 static inline u32 offb_cmap_byteswap(struct fb_info *info, u32 value)
97 {
98         u32 bpp = info->var.bits_per_pixel;
99
100         return cpu_to_be32(value) >> FB_RIGHT_POS(info, bpp);
101 }
102
103     /*
104      *  Set a single color register. The values supplied are already
105      *  rounded down to the hardware's capabilities (according to the
106      *  entries in the var structure). Return != 0 for invalid regno.
107      */
108
109 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
110                           u_int transp, struct fb_info *info)
111 {
112         struct offb_par *par = (struct offb_par *) info->par;
113
114         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
115                 u32 *pal = info->pseudo_palette;
116                 u32 cr = red >> (16 - info->var.red.length);
117                 u32 cg = green >> (16 - info->var.green.length);
118                 u32 cb = blue >> (16 - info->var.blue.length);
119                 u32 value;
120
121                 if (regno >= 16)
122                         return -EINVAL;
123
124                 value = (cr << info->var.red.offset) |
125                         (cg << info->var.green.offset) |
126                         (cb << info->var.blue.offset);
127                 if (info->var.transp.length > 0) {
128                         u32 mask = (1 << info->var.transp.length) - 1;
129                         mask <<= info->var.transp.offset;
130                         value |= mask;
131                 }
132                 pal[regno] = offb_cmap_byteswap(info, value);
133                 return 0;
134         }
135
136         if (regno > 255)
137                 return -EINVAL;
138
139         red >>= 8;
140         green >>= 8;
141         blue >>= 8;
142
143         if (!par->cmap_adr)
144                 return 0;
145
146         switch (par->cmap_type) {
147         case cmap_simple:
148                 writeb(regno, par->cmap_adr);
149                 writeb(red, par->cmap_data);
150                 writeb(green, par->cmap_data);
151                 writeb(blue, par->cmap_data);
152                 break;
153         case cmap_M3A:
154                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
155                 out_le32(par->cmap_adr + 0x58,
156                          in_le32(par->cmap_adr + 0x58) & ~0x20);
157         case cmap_r128:
158                 /* Set palette index & data */
159                 out_8(par->cmap_adr + 0xb0, regno);
160                 out_le32(par->cmap_adr + 0xb4,
161                          (red << 16 | green << 8 | blue));
162                 break;
163         case cmap_M3B:
164                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
165                 out_le32(par->cmap_adr + 0x58,
166                          in_le32(par->cmap_adr + 0x58) | 0x20);
167                 /* Set palette index & data */
168                 out_8(par->cmap_adr + 0xb0, regno);
169                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
170                 break;
171         case cmap_radeon:
172                 /* Set palette index & data (could be smarter) */
173                 out_8(par->cmap_adr + 0xb0, regno);
174                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
175                 break;
176         case cmap_gxt2000:
177                 out_le32(((unsigned __iomem *) par->cmap_adr) + regno,
178                          (red << 16 | green << 8 | blue));
179                 break;
180         case cmap_avivo:
181                 /* Write to both LUTs for now */
182                 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
183                 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
184                 writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
185                        par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
186                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
187                 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
188                 writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
189                        par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
190                 break;
191         }
192
193         return 0;
194 }
195
196     /*
197      *  Blank the display.
198      */
199
200 static int offb_blank(int blank, struct fb_info *info)
201 {
202         struct offb_par *par = (struct offb_par *) info->par;
203         int i, j;
204
205         if (!par->cmap_adr)
206                 return 0;
207
208         if (!par->blanked)
209                 if (!blank)
210                         return 0;
211
212         par->blanked = blank;
213
214         if (blank)
215                 for (i = 0; i < 256; i++) {
216                         switch (par->cmap_type) {
217                         case cmap_simple:
218                                 writeb(i, par->cmap_adr);
219                                 for (j = 0; j < 3; j++)
220                                         writeb(0, par->cmap_data);
221                                 break;
222                         case cmap_M3A:
223                                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
224                                 out_le32(par->cmap_adr + 0x58,
225                                          in_le32(par->cmap_adr + 0x58) & ~0x20);
226                         case cmap_r128:
227                                 /* Set palette index & data */
228                                 out_8(par->cmap_adr + 0xb0, i);
229                                 out_le32(par->cmap_adr + 0xb4, 0);
230                                 break;
231                         case cmap_M3B:
232                                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
233                                 out_le32(par->cmap_adr + 0x58,
234                                          in_le32(par->cmap_adr + 0x58) | 0x20);
235                                 /* Set palette index & data */
236                                 out_8(par->cmap_adr + 0xb0, i);
237                                 out_le32(par->cmap_adr + 0xb4, 0);
238                                 break;
239                         case cmap_radeon:
240                                 out_8(par->cmap_adr + 0xb0, i);
241                                 out_le32(par->cmap_adr + 0xb4, 0);
242                                 break;
243                         case cmap_gxt2000:
244                                 out_le32(((unsigned __iomem *) par->cmap_adr) + i,
245                                          0);
246                                 break;
247                         case cmap_avivo:
248                                 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
249                                 writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
250                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
251                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
252                                 writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
253                                 writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
254                                 break;
255                         }
256         } else
257                 fb_set_cmap(&info->cmap, info);
258         return 0;
259 }
260
261 static int offb_set_par(struct fb_info *info)
262 {
263         struct offb_par *par = (struct offb_par *) info->par;
264
265         /* On avivo, initialize palette control */
266         if (par->cmap_type == cmap_avivo) {
267                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_CONTROL);
268                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_BLUE);
269                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_GREEN);
270                 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_RED);
271                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_BLUE);
272                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_GREEN);
273                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_RED);
274                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_CONTROL);
275                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_BLUE);
276                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_GREEN);
277                 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_RED);
278                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_BLUE);
279                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_GREEN);
280                 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_RED);
281                 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
282                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
283                 writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
284                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
285                 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
286                 writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
287         }
288         return 0;
289 }
290
291 static void offb_destroy(struct fb_info *info)
292 {
293         if (info->screen_base)
294                 iounmap(info->screen_base);
295         release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
296         framebuffer_release(info);
297 }
298
299 static struct fb_ops offb_ops = {
300         .owner          = THIS_MODULE,
301         .fb_destroy     = offb_destroy,
302         .fb_setcolreg   = offb_setcolreg,
303         .fb_set_par     = offb_set_par,
304         .fb_blank       = offb_blank,
305         .fb_fillrect    = cfb_fillrect,
306         .fb_copyarea    = cfb_copyarea,
307         .fb_imageblit   = cfb_imageblit,
308 };
309
310 static void __iomem *offb_map_reg(struct device_node *np, int index,
311                                   unsigned long offset, unsigned long size)
312 {
313         const __be32 *addrp;
314         u64 asize, taddr;
315         unsigned int flags;
316
317         addrp = of_get_pci_address(np, index, &asize, &flags);
318         if (addrp == NULL)
319                 addrp = of_get_address(np, index, &asize, &flags);
320         if (addrp == NULL)
321                 return NULL;
322         if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
323                 return NULL;
324         if ((offset + size) > asize)
325                 return NULL;
326         taddr = of_translate_address(np, addrp);
327         if (taddr == OF_BAD_ADDR)
328                 return NULL;
329         return ioremap(taddr + offset, size);
330 }
331
332 static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp,
333                                     const char *name, unsigned long address)
334 {
335         struct offb_par *par = (struct offb_par *) info->par;
336
337         if (dp && !strncmp(name, "ATY,Rage128", 11)) {
338                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
339                 if (par->cmap_adr)
340                         par->cmap_type = cmap_r128;
341         } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
342                           || !strncmp(name, "ATY,RageM3p12A", 14))) {
343                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
344                 if (par->cmap_adr)
345                         par->cmap_type = cmap_M3A;
346         } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
347                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
348                 if (par->cmap_adr)
349                         par->cmap_type = cmap_M3B;
350         } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
351                 par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff);
352                 if (par->cmap_adr)
353                         par->cmap_type = cmap_radeon;
354         } else if (!strncmp(name, "ATY,", 4)) {
355                 unsigned long base = address & 0xff000000UL;
356                 par->cmap_adr =
357                         ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
358                 par->cmap_data = par->cmap_adr + 1;
359                 par->cmap_type = cmap_simple;
360         } else if (dp && (of_device_is_compatible(dp, "pci1014,b7") ||
361                           of_device_is_compatible(dp, "pci1014,21c"))) {
362                 par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000);
363                 if (par->cmap_adr)
364                         par->cmap_type = cmap_gxt2000;
365         } else if (dp && !strncmp(name, "vga,Display-", 12)) {
366                 /* Look for AVIVO initialized by SLOF */
367                 struct device_node *pciparent = of_get_parent(dp);
368                 const u32 *vid, *did;
369                 vid = of_get_property(pciparent, "vendor-id", NULL);
370                 did = of_get_property(pciparent, "device-id", NULL);
371                 /* This will match most R5xx */
372                 if (vid && did && *vid == 0x1002 &&
373                     ((*did >= 0x7100 && *did < 0x7800) ||
374                      (*did >= 0x9400))) {
375                         par->cmap_adr = offb_map_reg(pciparent, 2, 0, 0x10000);
376                         if (par->cmap_adr)
377                                 par->cmap_type = cmap_avivo;
378                 }
379                 of_node_put(pciparent);
380         } else if (dp && of_device_is_compatible(dp, "qemu,std-vga")) {
381 #ifdef __BIG_ENDIAN
382                 const __be32 io_of_addr[3] = { 0x01000000, 0x0, 0x0 };
383 #else
384                 const __be32 io_of_addr[3] = { 0x00000001, 0x0, 0x0 };
385 #endif
386                 u64 io_addr = of_translate_address(dp, io_of_addr);
387                 if (io_addr != OF_BAD_ADDR) {
388                         par->cmap_adr = ioremap(io_addr + 0x3c8, 2);
389                         if (par->cmap_adr) {
390                                 par->cmap_type = cmap_simple;
391                                 par->cmap_data = par->cmap_adr + 1;
392                         }
393                 }
394         }
395         info->fix.visual = (par->cmap_type != cmap_unknown) ?
396                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
397 }
398
399 static void __init offb_init_fb(const char *name, const char *full_name,
400                                 int width, int height, int depth,
401                                 int pitch, unsigned long address,
402                                 int foreign_endian, struct device_node *dp)
403 {
404         unsigned long res_size = pitch * height;
405         struct offb_par *par = &default_par;
406         unsigned long res_start = address;
407         struct fb_fix_screeninfo *fix;
408         struct fb_var_screeninfo *var;
409         struct fb_info *info;
410
411         if (!request_mem_region(res_start, res_size, "offb"))
412                 return;
413
414         printk(KERN_INFO
415                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
416                width, height, name, address, depth, pitch);
417         if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
418                 printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
419                        depth);
420                 release_mem_region(res_start, res_size);
421                 return;
422         }
423
424         info = framebuffer_alloc(sizeof(u32) * 16, NULL);
425         
426         if (info == 0) {
427                 release_mem_region(res_start, res_size);
428                 return;
429         }
430
431         fix = &info->fix;
432         var = &info->var;
433         info->par = par;
434
435         strcpy(fix->id, "OFfb ");
436         strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
437         fix->id[sizeof(fix->id) - 1] = '\0';
438
439         var->xres = var->xres_virtual = width;
440         var->yres = var->yres_virtual = height;
441         fix->line_length = pitch;
442
443         fix->smem_start = address;
444         fix->smem_len = pitch * height;
445         fix->type = FB_TYPE_PACKED_PIXELS;
446         fix->type_aux = 0;
447
448         par->cmap_type = cmap_unknown;
449         if (depth == 8)
450                 offb_init_palette_hacks(info, dp, name, address);
451         else
452                 fix->visual = FB_VISUAL_TRUECOLOR;
453
454         var->xoffset = var->yoffset = 0;
455         switch (depth) {
456         case 8:
457                 var->bits_per_pixel = 8;
458                 var->red.offset = 0;
459                 var->red.length = 8;
460                 var->green.offset = 0;
461                 var->green.length = 8;
462                 var->blue.offset = 0;
463                 var->blue.length = 8;
464                 var->transp.offset = 0;
465                 var->transp.length = 0;
466                 break;
467         case 15:                /* RGB 555 */
468                 var->bits_per_pixel = 16;
469                 var->red.offset = 10;
470                 var->red.length = 5;
471                 var->green.offset = 5;
472                 var->green.length = 5;
473                 var->blue.offset = 0;
474                 var->blue.length = 5;
475                 var->transp.offset = 0;
476                 var->transp.length = 0;
477                 break;
478         case 16:                /* RGB 565 */
479                 var->bits_per_pixel = 16;
480                 var->red.offset = 11;
481                 var->red.length = 5;
482                 var->green.offset = 5;
483                 var->green.length = 6;
484                 var->blue.offset = 0;
485                 var->blue.length = 5;
486                 var->transp.offset = 0;
487                 var->transp.length = 0;
488                 break;
489         case 32:                /* RGB 888 */
490                 var->bits_per_pixel = 32;
491                 var->red.offset = 16;
492                 var->red.length = 8;
493                 var->green.offset = 8;
494                 var->green.length = 8;
495                 var->blue.offset = 0;
496                 var->blue.length = 8;
497                 var->transp.offset = 24;
498                 var->transp.length = 8;
499                 break;
500         }
501         var->red.msb_right = var->green.msb_right = var->blue.msb_right =
502             var->transp.msb_right = 0;
503         var->grayscale = 0;
504         var->nonstd = 0;
505         var->activate = 0;
506         var->height = var->width = -1;
507         var->pixclock = 10000;
508         var->left_margin = var->right_margin = 16;
509         var->upper_margin = var->lower_margin = 16;
510         var->hsync_len = var->vsync_len = 8;
511         var->sync = 0;
512         var->vmode = FB_VMODE_NONINTERLACED;
513
514         /* set offb aperture size for generic probing */
515         info->apertures = alloc_apertures(1);
516         if (!info->apertures)
517                 goto out_aper;
518         info->apertures->ranges[0].base = address;
519         info->apertures->ranges[0].size = fix->smem_len;
520
521         info->fbops = &offb_ops;
522         info->screen_base = ioremap(address, fix->smem_len);
523         info->pseudo_palette = (void *) (info + 1);
524         info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE | foreign_endian;
525
526         fb_alloc_cmap(&info->cmap, 256, 0);
527
528         if (register_framebuffer(info) < 0)
529                 goto out_err;
530
531         fb_info(info, "Open Firmware frame buffer device on %s\n", full_name);
532         return;
533
534 out_err:
535         iounmap(info->screen_base);
536 out_aper:
537         iounmap(par->cmap_adr);
538         par->cmap_adr = NULL;
539         framebuffer_release(info);
540         release_mem_region(res_start, res_size);
541 }
542
543
544 static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
545 {
546         unsigned int len;
547         int i, width = 640, height = 480, depth = 8, pitch = 640;
548         unsigned int flags, rsize, addr_prop = 0;
549         unsigned long max_size = 0;
550         u64 rstart, address = OF_BAD_ADDR;
551         const __be32 *pp, *addrp, *up;
552         u64 asize;
553         int foreign_endian = 0;
554
555 #ifdef __BIG_ENDIAN
556         if (of_get_property(dp, "little-endian", NULL))
557                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
558 #else
559         if (of_get_property(dp, "big-endian", NULL))
560                 foreign_endian = FBINFO_FOREIGN_ENDIAN;
561 #endif
562
563         pp = of_get_property(dp, "linux,bootx-depth", &len);
564         if (pp == NULL)
565                 pp = of_get_property(dp, "depth", &len);
566         if (pp && len == sizeof(u32))
567                 depth = be32_to_cpup(pp);
568
569         pp = of_get_property(dp, "linux,bootx-width", &len);
570         if (pp == NULL)
571                 pp = of_get_property(dp, "width", &len);
572         if (pp && len == sizeof(u32))
573                 width = be32_to_cpup(pp);
574
575         pp = of_get_property(dp, "linux,bootx-height", &len);
576         if (pp == NULL)
577                 pp = of_get_property(dp, "height", &len);
578         if (pp && len == sizeof(u32))
579                 height = be32_to_cpup(pp);
580
581         pp = of_get_property(dp, "linux,bootx-linebytes", &len);
582         if (pp == NULL)
583                 pp = of_get_property(dp, "linebytes", &len);
584         if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
585                 pitch = be32_to_cpup(pp);
586         else
587                 pitch = width * ((depth + 7) / 8);
588
589         rsize = (unsigned long)pitch * (unsigned long)height;
590
591         /* Ok, now we try to figure out the address of the framebuffer.
592          *
593          * Unfortunately, Open Firmware doesn't provide a standard way to do
594          * so. All we can do is a dodgy heuristic that happens to work in
595          * practice. On most machines, the "address" property contains what
596          * we need, though not on Matrox cards found in IBM machines. What I've
597          * found that appears to give good results is to go through the PCI
598          * ranges and pick one that is both big enough and if possible encloses
599          * the "address" property. If none match, we pick the biggest
600          */
601         up = of_get_property(dp, "linux,bootx-addr", &len);
602         if (up == NULL)
603                 up = of_get_property(dp, "address", &len);
604         if (up && len == sizeof(u32))
605                 addr_prop = *up;
606
607         /* Hack for when BootX is passing us */
608         if (no_real_node)
609                 goto skip_addr;
610
611         for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
612                      != NULL; i++) {
613                 int match_addrp = 0;
614
615                 if (!(flags & IORESOURCE_MEM))
616                         continue;
617                 if (asize < rsize)
618                         continue;
619                 rstart = of_translate_address(dp, addrp);
620                 if (rstart == OF_BAD_ADDR)
621                         continue;
622                 if (addr_prop && (rstart <= addr_prop) &&
623                     ((rstart + asize) >= (addr_prop + rsize)))
624                         match_addrp = 1;
625                 if (match_addrp) {
626                         address = addr_prop;
627                         break;
628                 }
629                 if (rsize > max_size) {
630                         max_size = rsize;
631                         address = OF_BAD_ADDR;
632                 }
633
634                 if (address == OF_BAD_ADDR)
635                         address = rstart;
636         }
637  skip_addr:
638         if (address == OF_BAD_ADDR && addr_prop)
639                 address = (u64)addr_prop;
640         if (address != OF_BAD_ADDR) {
641                 /* kludge for valkyrie */
642                 if (strcmp(dp->name, "valkyrie") == 0)
643                         address += 0x1000;
644                 offb_init_fb(no_real_node ? "bootx" : dp->name,
645                              no_real_node ? "display" : dp->full_name,
646                              width, height, depth, pitch, address,
647                              foreign_endian, no_real_node ? NULL : dp);
648         }
649 }
650
651 static int __init offb_init(void)
652 {
653         struct device_node *dp = NULL, *boot_disp = NULL;
654
655         if (fb_get_options("offb", NULL))
656                 return -ENODEV;
657
658         /* Check if we have a MacOS display without a node spec */
659         if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) {
660                 /* The old code tried to work out which node was the MacOS
661                  * display based on the address. I'm dropping that since the
662                  * lack of a node spec only happens with old BootX versions
663                  * (users can update) and with this code, they'll still get
664                  * a display (just not the palette hacks).
665                  */
666                 offb_init_nodriver(of_chosen, 1);
667         }
668
669         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
670                 if (of_get_property(dp, "linux,opened", NULL) &&
671                     of_get_property(dp, "linux,boot-display", NULL)) {
672                         boot_disp = dp;
673                         offb_init_nodriver(dp, 0);
674                 }
675         }
676         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
677                 if (of_get_property(dp, "linux,opened", NULL) &&
678                     dp != boot_disp)
679                         offb_init_nodriver(dp, 0);
680         }
681
682         return 0;
683 }
684
685
686 module_init(offb_init);
687 MODULE_LICENSE("GPL");