Pull bugzilla-7880 into release branch
[linux-2.6] / drivers / video / offb.c
1 /*
2  *  linux/drivers/video/offb.c -- Open Firmware based frame buffer device
3  *
4  *      Copyright (C) 1997 Geert Uytterhoeven
5  *
6  *  This driver is partly based on the PowerMac console driver:
7  *
8  *      Copyright (C) 1996 Paul Mackerras
9  *
10  *  This file is subject to the terms and conditions of the GNU General Public
11  *  License. See the file COPYING in the main directory of this archive for
12  *  more details.
13  */
14
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/errno.h>
18 #include <linux/string.h>
19 #include <linux/mm.h>
20 #include <linux/slab.h>
21 #include <linux/vmalloc.h>
22 #include <linux/delay.h>
23 #include <linux/interrupt.h>
24 #include <linux/fb.h>
25 #include <linux/init.h>
26 #include <linux/ioport.h>
27 #include <linux/pci.h>
28 #include <asm/io.h>
29 #include <asm/prom.h>
30
31 #ifdef CONFIG_PPC64
32 #include <asm/pci-bridge.h>
33 #endif
34
35 #ifdef CONFIG_PPC32
36 #include <asm/bootx.h>
37 #endif
38
39 #include "macmodes.h"
40
41 /* Supported palette hacks */
42 enum {
43         cmap_unknown,
44         cmap_m64,               /* ATI Mach64 */
45         cmap_r128,              /* ATI Rage128 */
46         cmap_M3A,               /* ATI Rage Mobility M3 Head A */
47         cmap_M3B,               /* ATI Rage Mobility M3 Head B */
48         cmap_radeon,            /* ATI Radeon */
49         cmap_gxt2000,           /* IBM GXT2000 */
50 };
51
52 struct offb_par {
53         volatile void __iomem *cmap_adr;
54         volatile void __iomem *cmap_data;
55         int cmap_type;
56         int blanked;
57 };
58
59 struct offb_par default_par;
60
61     /*
62      *  Interface used by the world
63      */
64
65 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
66                           u_int transp, struct fb_info *info);
67 static int offb_blank(int blank, struct fb_info *info);
68
69 #ifdef CONFIG_PPC32
70 extern boot_infos_t *boot_infos;
71 #endif
72
73 static struct fb_ops offb_ops = {
74         .owner          = THIS_MODULE,
75         .fb_setcolreg   = offb_setcolreg,
76         .fb_blank       = offb_blank,
77         .fb_fillrect    = cfb_fillrect,
78         .fb_copyarea    = cfb_copyarea,
79         .fb_imageblit   = cfb_imageblit,
80 };
81
82     /*
83      *  Set a single color register. The values supplied are already
84      *  rounded down to the hardware's capabilities (according to the
85      *  entries in the var structure). Return != 0 for invalid regno.
86      */
87
88 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
89                           u_int transp, struct fb_info *info)
90 {
91         struct offb_par *par = (struct offb_par *) info->par;
92         int i, depth;
93         u32 *pal = info->pseudo_palette;
94
95         depth = info->var.bits_per_pixel;
96         if (depth == 16)
97                 depth = (info->var.green.length == 5) ? 15 : 16;
98
99         if (regno > 255 ||
100             (depth == 16 && regno > 63) ||
101             (depth == 15 && regno > 31))
102                 return 1;
103
104         if (regno < 16) {
105                 switch (depth) {
106                 case 15:
107                         pal[regno] = (regno << 10) | (regno << 5) | regno;
108                         break;
109                 case 16:
110                         pal[regno] = (regno << 11) | (regno << 5) | regno;
111                         break;
112                 case 24:
113                         pal[regno] = (regno << 16) | (regno << 8) | regno;
114                         break;
115                 case 32:
116                         i = (regno << 8) | regno;
117                         pal[regno] = (i << 16) | i;
118                         break;
119                 }
120         }
121
122         red >>= 8;
123         green >>= 8;
124         blue >>= 8;
125
126         if (!par->cmap_adr)
127                 return 0;
128
129         switch (par->cmap_type) {
130         case cmap_m64:
131                 writeb(regno, par->cmap_adr);
132                 writeb(red, par->cmap_data);
133                 writeb(green, par->cmap_data);
134                 writeb(blue, par->cmap_data);
135                 break;
136         case cmap_M3A:
137                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
138                 out_le32(par->cmap_adr + 0x58,
139                          in_le32(par->cmap_adr + 0x58) & ~0x20);
140         case cmap_r128:
141                 /* Set palette index & data */
142                 out_8(par->cmap_adr + 0xb0, regno);
143                 out_le32(par->cmap_adr + 0xb4,
144                          (red << 16 | green << 8 | blue));
145                 break;
146         case cmap_M3B:
147                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
148                 out_le32(par->cmap_adr + 0x58,
149                          in_le32(par->cmap_adr + 0x58) | 0x20);
150                 /* Set palette index & data */
151                 out_8(par->cmap_adr + 0xb0, regno);
152                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
153                 break;
154         case cmap_radeon:
155                 /* Set palette index & data (could be smarter) */
156                 out_8(par->cmap_adr + 0xb0, regno);
157                 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
158                 break;
159         case cmap_gxt2000:
160                 out_le32(((unsigned __iomem *) par->cmap_adr) + regno,
161                          (red << 16 | green << 8 | blue));
162                 break;
163         }
164
165         return 0;
166 }
167
168     /*
169      *  Blank the display.
170      */
171
172 static int offb_blank(int blank, struct fb_info *info)
173 {
174         struct offb_par *par = (struct offb_par *) info->par;
175         int i, j;
176
177         if (!par->cmap_adr)
178                 return 0;
179
180         if (!par->blanked)
181                 if (!blank)
182                         return 0;
183
184         par->blanked = blank;
185
186         if (blank)
187                 for (i = 0; i < 256; i++) {
188                         switch (par->cmap_type) {
189                         case cmap_m64:
190                                 writeb(i, par->cmap_adr);
191                                 for (j = 0; j < 3; j++)
192                                         writeb(0, par->cmap_data);
193                                 break;
194                         case cmap_M3A:
195                                 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
196                                 out_le32(par->cmap_adr + 0x58,
197                                          in_le32(par->cmap_adr + 0x58) & ~0x20);
198                         case cmap_r128:
199                                 /* Set palette index & data */
200                                 out_8(par->cmap_adr + 0xb0, i);
201                                 out_le32(par->cmap_adr + 0xb4, 0);
202                                 break;
203                         case cmap_M3B:
204                                 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
205                                 out_le32(par->cmap_adr + 0x58,
206                                          in_le32(par->cmap_adr + 0x58) | 0x20);
207                                 /* Set palette index & data */
208                                 out_8(par->cmap_adr + 0xb0, i);
209                                 out_le32(par->cmap_adr + 0xb4, 0);
210                                 break;
211                         case cmap_radeon:
212                                 out_8(par->cmap_adr + 0xb0, i);
213                                 out_le32(par->cmap_adr + 0xb4, 0);
214                                 break;
215                         case cmap_gxt2000:
216                                 out_le32(((unsigned __iomem *) par->cmap_adr) + i,
217                                          0);
218                                 break;
219                         }
220         } else
221                 fb_set_cmap(&info->cmap, info);
222         return 0;
223 }
224
225
226 static void __iomem *offb_map_reg(struct device_node *np, int index,
227                                   unsigned long offset, unsigned long size)
228 {
229         const u32 *addrp;
230         u64 asize, taddr;
231         unsigned int flags;
232
233         addrp = of_get_pci_address(np, index, &asize, &flags);
234         if (addrp == NULL)
235                 addrp = of_get_address(np, index, &asize, &flags);
236         if (addrp == NULL)
237                 return NULL;
238         if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
239                 return NULL;
240         if ((offset + size) > asize)
241                 return NULL;
242         taddr = of_translate_address(np, addrp);
243         if (taddr == OF_BAD_ADDR)
244                 return NULL;
245         return ioremap(taddr + offset, size);
246 }
247
248 static void __init offb_init_fb(const char *name, const char *full_name,
249                                 int width, int height, int depth,
250                                 int pitch, unsigned long address,
251                                 struct device_node *dp)
252 {
253         unsigned long res_size = pitch * height * (depth + 7) / 8;
254         struct offb_par *par = &default_par;
255         unsigned long res_start = address;
256         struct fb_fix_screeninfo *fix;
257         struct fb_var_screeninfo *var;
258         struct fb_info *info;
259         int size;
260
261         if (!request_mem_region(res_start, res_size, "offb"))
262                 return;
263
264         printk(KERN_INFO
265                "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
266                width, height, name, address, depth, pitch);
267         if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
268                 printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
269                        depth);
270                 release_mem_region(res_start, res_size);
271                 return;
272         }
273
274         size = sizeof(struct fb_info) + sizeof(u32) * 16;
275
276         info = kmalloc(size, GFP_ATOMIC);
277         
278         if (info == 0) {
279                 release_mem_region(res_start, res_size);
280                 return;
281         }
282         memset(info, 0, size);
283
284         fix = &info->fix;
285         var = &info->var;
286
287         strcpy(fix->id, "OFfb ");
288         strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
289         fix->id[sizeof(fix->id) - 1] = '\0';
290
291         var->xres = var->xres_virtual = width;
292         var->yres = var->yres_virtual = height;
293         fix->line_length = pitch;
294
295         fix->smem_start = address;
296         fix->smem_len = pitch * height;
297         fix->type = FB_TYPE_PACKED_PIXELS;
298         fix->type_aux = 0;
299
300         par->cmap_type = cmap_unknown;
301         if (depth == 8) {
302                 if (dp && !strncmp(name, "ATY,Rage128", 11)) {
303                         par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
304                         if (par->cmap_adr)
305                                 par->cmap_type = cmap_r128;
306                 } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
307                                   || !strncmp(name, "ATY,RageM3p12A", 14))) {
308                         par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
309                         if (par->cmap_adr)
310                                 par->cmap_type = cmap_M3A;
311                 } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
312                         par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
313                         if (par->cmap_adr)
314                                 par->cmap_type = cmap_M3B;
315                 } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
316                         par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff);
317                         if (par->cmap_adr)
318                                 par->cmap_type = cmap_radeon;
319                 } else if (!strncmp(name, "ATY,", 4)) {
320                         unsigned long base = address & 0xff000000UL;
321                         par->cmap_adr =
322                             ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
323                         par->cmap_data = par->cmap_adr + 1;
324                         par->cmap_type = cmap_m64;
325                 } else if (dp && (of_device_is_compatible(dp, "pci1014,b7") ||
326                                   of_device_is_compatible(dp, "pci1014,21c"))) {
327                         par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000);
328                         if (par->cmap_adr)
329                                 par->cmap_type = cmap_gxt2000;
330                 }
331                 fix->visual = (par->cmap_type != cmap_unknown) ?
332                         FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
333         } else
334                 fix->visual = FB_VISUAL_TRUECOLOR;
335
336         var->xoffset = var->yoffset = 0;
337         switch (depth) {
338         case 8:
339                 var->bits_per_pixel = 8;
340                 var->red.offset = 0;
341                 var->red.length = 8;
342                 var->green.offset = 0;
343                 var->green.length = 8;
344                 var->blue.offset = 0;
345                 var->blue.length = 8;
346                 var->transp.offset = 0;
347                 var->transp.length = 0;
348                 break;
349         case 15:                /* RGB 555 */
350                 var->bits_per_pixel = 16;
351                 var->red.offset = 10;
352                 var->red.length = 5;
353                 var->green.offset = 5;
354                 var->green.length = 5;
355                 var->blue.offset = 0;
356                 var->blue.length = 5;
357                 var->transp.offset = 0;
358                 var->transp.length = 0;
359                 break;
360         case 16:                /* RGB 565 */
361                 var->bits_per_pixel = 16;
362                 var->red.offset = 11;
363                 var->red.length = 5;
364                 var->green.offset = 5;
365                 var->green.length = 6;
366                 var->blue.offset = 0;
367                 var->blue.length = 5;
368                 var->transp.offset = 0;
369                 var->transp.length = 0;
370                 break;
371         case 32:                /* RGB 888 */
372                 var->bits_per_pixel = 32;
373                 var->red.offset = 16;
374                 var->red.length = 8;
375                 var->green.offset = 8;
376                 var->green.length = 8;
377                 var->blue.offset = 0;
378                 var->blue.length = 8;
379                 var->transp.offset = 24;
380                 var->transp.length = 8;
381                 break;
382         }
383         var->red.msb_right = var->green.msb_right = var->blue.msb_right =
384             var->transp.msb_right = 0;
385         var->grayscale = 0;
386         var->nonstd = 0;
387         var->activate = 0;
388         var->height = var->width = -1;
389         var->pixclock = 10000;
390         var->left_margin = var->right_margin = 16;
391         var->upper_margin = var->lower_margin = 16;
392         var->hsync_len = var->vsync_len = 8;
393         var->sync = 0;
394         var->vmode = FB_VMODE_NONINTERLACED;
395
396         info->fbops = &offb_ops;
397         info->screen_base = ioremap(address, fix->smem_len);
398         info->par = par;
399         info->pseudo_palette = (void *) (info + 1);
400         info->flags = FBINFO_DEFAULT;
401
402         fb_alloc_cmap(&info->cmap, 256, 0);
403
404         if (register_framebuffer(info) < 0) {
405                 iounmap(par->cmap_adr);
406                 par->cmap_adr = NULL;
407                 iounmap(info->screen_base);
408                 kfree(info);
409                 release_mem_region(res_start, res_size);
410                 return;
411         }
412
413         printk(KERN_INFO "fb%d: Open Firmware frame buffer device on %s\n",
414                info->node, full_name);
415 }
416
417
418 static void __init offb_init_nodriver(struct device_node *dp, int no_real_node)
419 {
420         unsigned int len;
421         int i, width = 640, height = 480, depth = 8, pitch = 640;
422         unsigned int flags, rsize, addr_prop = 0;
423         unsigned long max_size = 0;
424         u64 rstart, address = OF_BAD_ADDR;
425         const u32 *pp, *addrp, *up;
426         u64 asize;
427
428         pp = of_get_property(dp, "linux,bootx-depth", &len);
429         if (pp == NULL)
430                 pp = of_get_property(dp, "depth", &len);
431         if (pp && len == sizeof(u32))
432                 depth = *pp;
433
434         pp = of_get_property(dp, "linux,bootx-width", &len);
435         if (pp == NULL)
436                 pp = of_get_property(dp, "width", &len);
437         if (pp && len == sizeof(u32))
438                 width = *pp;
439
440         pp = of_get_property(dp, "linux,bootx-height", &len);
441         if (pp == NULL)
442                 pp = of_get_property(dp, "height", &len);
443         if (pp && len == sizeof(u32))
444                 height = *pp;
445
446         pp = of_get_property(dp, "linux,bootx-linebytes", &len);
447         if (pp == NULL)
448                 pp = of_get_property(dp, "linebytes", &len);
449         if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
450                 pitch = *pp;
451         else
452                 pitch = width * ((depth + 7) / 8);
453
454         rsize = (unsigned long)pitch * (unsigned long)height;
455
456         /* Ok, now we try to figure out the address of the framebuffer.
457          *
458          * Unfortunately, Open Firmware doesn't provide a standard way to do
459          * so. All we can do is a dodgy heuristic that happens to work in
460          * practice. On most machines, the "address" property contains what
461          * we need, though not on Matrox cards found in IBM machines. What I've
462          * found that appears to give good results is to go through the PCI
463          * ranges and pick one that is both big enough and if possible encloses
464          * the "address" property. If none match, we pick the biggest
465          */
466         up = of_get_property(dp, "linux,bootx-addr", &len);
467         if (up == NULL)
468                 up = of_get_property(dp, "address", &len);
469         if (up && len == sizeof(u32))
470                 addr_prop = *up;
471
472         /* Hack for when BootX is passing us */
473         if (no_real_node)
474                 goto skip_addr;
475
476         for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
477                      != NULL; i++) {
478                 int match_addrp = 0;
479
480                 if (!(flags & IORESOURCE_MEM))
481                         continue;
482                 if (asize < rsize)
483                         continue;
484                 rstart = of_translate_address(dp, addrp);
485                 if (rstart == OF_BAD_ADDR)
486                         continue;
487                 if (addr_prop && (rstart <= addr_prop) &&
488                     ((rstart + asize) >= (addr_prop + rsize)))
489                         match_addrp = 1;
490                 if (match_addrp) {
491                         address = addr_prop;
492                         break;
493                 }
494                 if (rsize > max_size) {
495                         max_size = rsize;
496                         address = OF_BAD_ADDR;
497                 }
498
499                 if (address == OF_BAD_ADDR)
500                         address = rstart;
501         }
502  skip_addr:
503         if (address == OF_BAD_ADDR && addr_prop)
504                 address = (u64)addr_prop;
505         if (address != OF_BAD_ADDR) {
506                 /* kludge for valkyrie */
507                 if (strcmp(dp->name, "valkyrie") == 0)
508                         address += 0x1000;
509                 offb_init_fb(no_real_node ? "bootx" : dp->name,
510                              no_real_node ? "display" : dp->full_name,
511                              width, height, depth, pitch, address,
512                              no_real_node ? NULL : dp);
513         }
514 }
515
516 static int __init offb_init(void)
517 {
518         struct device_node *dp = NULL, *boot_disp = NULL;
519
520         if (fb_get_options("offb", NULL))
521                 return -ENODEV;
522
523         /* Check if we have a MacOS display without a node spec */
524         if (of_get_property(of_chosen, "linux,bootx-noscreen", NULL) != NULL) {
525                 /* The old code tried to work out which node was the MacOS
526                  * display based on the address. I'm dropping that since the
527                  * lack of a node spec only happens with old BootX versions
528                  * (users can update) and with this code, they'll still get
529                  * a display (just not the palette hacks).
530                  */
531                 offb_init_nodriver(of_chosen, 1);
532         }
533
534         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
535                 if (of_get_property(dp, "linux,opened", NULL) &&
536                     of_get_property(dp, "linux,boot-display", NULL)) {
537                         boot_disp = dp;
538                         offb_init_nodriver(dp, 0);
539                 }
540         }
541         for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
542                 if (of_get_property(dp, "linux,opened", NULL) &&
543                     dp != boot_disp)
544                         offb_init_nodriver(dp, 0);
545         }
546
547         return 0;
548 }
549
550
551 module_init(offb_init);
552 MODULE_LICENSE("GPL");