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Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-zesty-kernel.git] / drivers / video / fbdev / 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 /*
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");
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