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V4L/DVB (6715): ivtv: Remove unnecessary register update
[linux-2.6/verdex.git] / drivers / video / offb.c
blob452433d469738cd203115d7fa3779a239f476120
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");
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