2 * linux/drivers/video/offb.c -- Open Firmware based frame buffer device
4 * Copyright (C) 1997 Geert Uytterhoeven
6 * This driver is partly based on the PowerMac console driver:
8 * Copyright (C) 1996 Paul Mackerras
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
15 #include <linux/config.h>
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/errno.h>
19 #include <linux/string.h>
21 #include <linux/tty.h>
22 #include <linux/slab.h>
23 #include <linux/vmalloc.h>
24 #include <linux/delay.h>
25 #include <linux/interrupt.h>
27 #include <linux/init.h>
28 #include <linux/ioport.h>
29 #include <linux/pci.h>
34 #include <asm/pci-bridge.h>
38 #include <asm/bootx.h>
43 /* Supported palette hacks */
46 cmap_m64, /* ATI Mach64 */
47 cmap_r128, /* ATI Rage128 */
48 cmap_M3A, /* ATI Rage Mobility M3 Head A */
49 cmap_M3B, /* ATI Rage Mobility M3 Head B */
50 cmap_radeon, /* ATI Radeon */
51 cmap_gxt2000, /* IBM GXT2000 */
55 volatile void __iomem *cmap_adr;
56 volatile void __iomem *cmap_data;
61 struct offb_par default_par;
64 * Interface used by the world
69 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
70 u_int transp, struct fb_info *info);
71 static int offb_blank(int blank, struct fb_info *info);
74 extern boot_infos_t *boot_infos;
77 static void offb_init_nodriver(struct device_node *);
78 static void offb_init_fb(const char *name, const char *full_name,
79 int width, int height, int depth, int pitch,
80 unsigned long address, struct device_node *dp);
82 static struct fb_ops offb_ops = {
84 .fb_setcolreg = offb_setcolreg,
85 .fb_blank = offb_blank,
86 .fb_fillrect = cfb_fillrect,
87 .fb_copyarea = cfb_copyarea,
88 .fb_imageblit = cfb_imageblit,
92 * Set a single color register. The values supplied are already
93 * rounded down to the hardware's capabilities (according to the
94 * entries in the var structure). Return != 0 for invalid regno.
97 static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
98 u_int transp, struct fb_info *info)
100 struct offb_par *par = (struct offb_par *) info->par;
102 if (!par->cmap_adr || regno > 255)
109 switch (par->cmap_type) {
111 writeb(regno, par->cmap_adr);
112 writeb(red, par->cmap_data);
113 writeb(green, par->cmap_data);
114 writeb(blue, par->cmap_data);
117 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
118 out_le32(par->cmap_adr + 0x58,
119 in_le32(par->cmap_adr + 0x58) & ~0x20);
121 /* Set palette index & data */
122 out_8(par->cmap_adr + 0xb0, regno);
123 out_le32(par->cmap_adr + 0xb4,
124 (red << 16 | green << 8 | blue));
127 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
128 out_le32(par->cmap_adr + 0x58,
129 in_le32(par->cmap_adr + 0x58) | 0x20);
130 /* Set palette index & data */
131 out_8(par->cmap_adr + 0xb0, regno);
132 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
135 /* Set palette index & data (could be smarter) */
136 out_8(par->cmap_adr + 0xb0, regno);
137 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
140 out_le32((unsigned __iomem *) par->cmap_adr + regno,
141 (red << 16 | green << 8 | blue));
146 switch (info->var.bits_per_pixel) {
148 ((u16 *) (info->pseudo_palette))[regno] =
149 (regno << 10) | (regno << 5) | regno;
153 int i = (regno << 8) | regno;
154 ((u32 *) (info->pseudo_palette))[regno] =
166 static int offb_blank(int blank, struct fb_info *info)
168 struct offb_par *par = (struct offb_par *) info->par;
178 par->blanked = blank;
181 for (i = 0; i < 256; i++) {
182 switch (par->cmap_type) {
184 writeb(i, par->cmap_adr);
185 for (j = 0; j < 3; j++)
186 writeb(0, par->cmap_data);
189 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
190 out_le32(par->cmap_adr + 0x58,
191 in_le32(par->cmap_adr + 0x58) & ~0x20);
193 /* Set palette index & data */
194 out_8(par->cmap_adr + 0xb0, i);
195 out_le32(par->cmap_adr + 0xb4, 0);
198 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
199 out_le32(par->cmap_adr + 0x58,
200 in_le32(par->cmap_adr + 0x58) | 0x20);
201 /* Set palette index & data */
202 out_8(par->cmap_adr + 0xb0, i);
203 out_le32(par->cmap_adr + 0xb4, 0);
206 out_8(par->cmap_adr + 0xb0, i);
207 out_le32(par->cmap_adr + 0xb4, 0);
210 out_le32((unsigned __iomem *) par->cmap_adr + i,
215 fb_set_cmap(&info->cmap, info);
223 int __init offb_init(void)
225 struct device_node *dp = NULL, *boot_disp = NULL;
227 #if defined(CONFIG_BOOTX_TEXT) && defined(CONFIG_PPC32)
228 struct device_node *macos_display = NULL;
230 if (fb_get_options("offb", NULL))
233 #if defined(CONFIG_BOOTX_TEXT) && defined(CONFIG_PPC32)
234 /* If we're booted from BootX... */
235 if (boot_infos != 0) {
237 (unsigned long) boot_infos->dispDeviceBase;
242 /* find the device node corresponding to the macos display */
243 while ((dp = of_find_node_by_type(dp, "display"))) {
247 * Look for an AAPL,address property first.
251 (unsigned int *)get_property(dp, "AAPL,address",
254 for (na /= sizeof(unsigned int); na > 0;
257 addr < *ap + 0x1000000) {
264 * See if the display address is in one of the address
265 * ranges for this display.
269 addrp = of_get_address(dp, i++, &dsize, &flags);
272 if (!(flags & IORESOURCE_MEM))
274 daddr = of_translate_address(dp, addrp);
275 if (daddr == OF_BAD_ADDR)
277 if (daddr <= addr && addr < (daddr + dsize)) {
284 printk(KERN_INFO "MacOS display is %s\n",
291 offb_init_fb(macos_display ? macos_display->
292 name : "MacOS display",
293 macos_display ? macos_display->
294 full_name : "MacOS display",
295 boot_infos->dispDeviceRect[2],
296 boot_infos->dispDeviceRect[3],
297 boot_infos->dispDeviceDepth,
298 boot_infos->dispDeviceRowBytes, addr, NULL);
300 #endif /* defined(CONFIG_BOOTX_TEXT) && defined(CONFIG_PPC32) */
302 for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
303 if (get_property(dp, "linux,opened", NULL) &&
304 get_property(dp, "linux,boot-display", NULL)) {
306 offb_init_nodriver(dp);
309 for (dp = NULL; (dp = of_find_node_by_type(dp, "display"));) {
310 if (get_property(dp, "linux,opened", NULL) &&
312 offb_init_nodriver(dp);
319 static void __init offb_init_nodriver(struct device_node *dp)
323 int width = 640, height = 480, depth = 8, pitch;
324 unsigned flags, rsize, *up, addr_prop = 0;
325 unsigned long max_size = 0;
326 u64 rstart, address = OF_BAD_ADDR;
330 if ((pp = (int *) get_property(dp, "depth", &len)) != NULL
331 && len == sizeof(int))
333 if ((pp = (int *) get_property(dp, "width", &len)) != NULL
334 && len == sizeof(int))
336 if ((pp = (int *) get_property(dp, "height", &len)) != NULL
337 && len == sizeof(int))
339 if ((pp = (int *) get_property(dp, "linebytes", &len)) != NULL
340 && len == sizeof(int)) {
347 rsize = (unsigned long)pitch * (unsigned long)height *
348 (unsigned long)(depth / 8);
350 /* Ok, now we try to figure out the address of the framebuffer.
352 * Unfortunately, Open Firmware doesn't provide a standard way to do
353 * so. All we can do is a dodgy heuristic that happens to work in
354 * practice. On most machines, the "address" property contains what
355 * we need, though not on Matrox cards found in IBM machines. What I've
356 * found that appears to give good results is to go through the PCI
357 * ranges and pick one that is both big enough and if possible encloses
358 * the "address" property. If none match, we pick the biggest
360 up = (unsigned int *) get_property(dp, "address", &len);
361 if (up && len == sizeof(unsigned int))
364 for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
368 if (!(flags & IORESOURCE_MEM))
372 rstart = of_translate_address(dp, addrp);
373 if (rstart == OF_BAD_ADDR)
375 if (addr_prop && (rstart <= addr_prop) &&
376 ((rstart + rsize) > addr_prop))
382 if (rsize > max_size) {
384 address = OF_BAD_ADDR;
386 if (address == OF_BAD_ADDR)
389 if (address == OF_BAD_ADDR && addr_prop)
390 address = (u_long)addr_prop;
391 if (address != OF_BAD_ADDR) {
392 /* kludge for valkyrie */
393 if (strcmp(dp->name, "valkyrie") == 0)
395 offb_init_fb(dp->name, dp->full_name, width, height, depth,
400 static void __init offb_init_fb(const char *name, const char *full_name,
401 int width, int height, int depth,
402 int pitch, unsigned long address,
403 struct device_node *dp)
405 unsigned long res_size = pitch * height * depth / 8;
406 struct offb_par *par = &default_par;
407 unsigned long res_start = address;
408 struct fb_fix_screeninfo *fix;
409 struct fb_var_screeninfo *var;
410 struct fb_info *info;
413 if (!request_mem_region(res_start, res_size, "offb"))
417 "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
418 width, height, name, address, depth, pitch);
419 if (depth != 8 && depth != 16 && depth != 32) {
420 printk(KERN_ERR "%s: can't use depth = %d\n", full_name,
422 release_mem_region(res_start, res_size);
426 size = sizeof(struct fb_info) + sizeof(u32) * 17;
428 info = kmalloc(size, GFP_ATOMIC);
431 release_mem_region(res_start, res_size);
434 memset(info, 0, size);
439 strcpy(fix->id, "OFfb ");
440 strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
441 fix->id[sizeof(fix->id) - 1] = '\0';
443 var->xres = var->xres_virtual = width;
444 var->yres = var->yres_virtual = height;
445 fix->line_length = pitch;
447 fix->smem_start = address;
448 fix->smem_len = pitch * height;
449 fix->type = FB_TYPE_PACKED_PIXELS;
452 par->cmap_type = cmap_unknown;
455 /* Palette hacks disabled for now */
457 if (dp && !strncmp(name, "ATY,Rage128", 11)) {
458 unsigned long regbase = dp->addrs[2].address;
459 par->cmap_adr = ioremap(regbase, 0x1FFF);
460 par->cmap_type = cmap_r128;
461 } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
462 || !strncmp(name, "ATY,RageM3p12A", 14))) {
463 unsigned long regbase =
464 dp->parent->addrs[2].address;
465 par->cmap_adr = ioremap(regbase, 0x1FFF);
466 par->cmap_type = cmap_M3A;
467 } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
468 unsigned long regbase =
469 dp->parent->addrs[2].address;
470 par->cmap_adr = ioremap(regbase, 0x1FFF);
471 par->cmap_type = cmap_M3B;
472 } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
473 unsigned long regbase = dp->addrs[1].address;
474 par->cmap_adr = ioremap(regbase, 0x1FFF);
475 par->cmap_type = cmap_radeon;
476 } else if (!strncmp(name, "ATY,", 4)) {
477 unsigned long base = address & 0xff000000UL;
479 ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
480 par->cmap_data = par->cmap_adr + 1;
481 par->cmap_type = cmap_m64;
482 } else if (device_is_compatible(dp, "pci1014,b7")) {
483 unsigned long regbase = dp->addrs[0].address;
484 par->cmap_adr = ioremap(regbase + 0x6000, 0x1000);
485 par->cmap_type = cmap_gxt2000;
488 fix->visual = par->cmap_adr ? FB_VISUAL_PSEUDOCOLOR
489 : FB_VISUAL_STATIC_PSEUDOCOLOR;
491 fix->visual = /* par->cmap_adr ? FB_VISUAL_DIRECTCOLOR
492 : */ FB_VISUAL_TRUECOLOR;
494 var->xoffset = var->yoffset = 0;
495 var->bits_per_pixel = depth;
498 var->bits_per_pixel = 8;
501 var->green.offset = 0;
502 var->green.length = 8;
503 var->blue.offset = 0;
504 var->blue.length = 8;
505 var->transp.offset = 0;
506 var->transp.length = 0;
508 case 16: /* RGB 555 */
509 var->bits_per_pixel = 16;
510 var->red.offset = 10;
512 var->green.offset = 5;
513 var->green.length = 5;
514 var->blue.offset = 0;
515 var->blue.length = 5;
516 var->transp.offset = 0;
517 var->transp.length = 0;
519 case 32: /* RGB 888 */
520 var->bits_per_pixel = 32;
521 var->red.offset = 16;
523 var->green.offset = 8;
524 var->green.length = 8;
525 var->blue.offset = 0;
526 var->blue.length = 8;
527 var->transp.offset = 24;
528 var->transp.length = 8;
531 var->red.msb_right = var->green.msb_right = var->blue.msb_right =
532 var->transp.msb_right = 0;
536 var->height = var->width = -1;
537 var->pixclock = 10000;
538 var->left_margin = var->right_margin = 16;
539 var->upper_margin = var->lower_margin = 16;
540 var->hsync_len = var->vsync_len = 8;
542 var->vmode = FB_VMODE_NONINTERLACED;
544 info->fbops = &offb_ops;
545 info->screen_base = ioremap(address, fix->smem_len);
547 info->pseudo_palette = (void *) (info + 1);
548 info->flags = FBINFO_DEFAULT;
550 fb_alloc_cmap(&info->cmap, 256, 0);
552 if (register_framebuffer(info) < 0) {
554 release_mem_region(res_start, res_size);
558 printk(KERN_INFO "fb%d: Open Firmware frame buffer device on %s\n",
559 info->node, full_name);
562 module_init(offb_init);
563 MODULE_LICENSE("GPL");