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