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 <linux/platform_device.h>
30 #include <asm/io.h>
31
32 #ifdef CONFIG_PPC32
33 #include <asm/bootx.h>
34 #endif
35
36 #include "macmodes.h"
37
38 /* Supported palette hacks */
39 enum {
40 cmap_unknown,
41 cmap_simple, /* ATI Mach64 */
42 cmap_r128, /* ATI Rage128 */
43 cmap_M3A, /* ATI Rage Mobility M3 Head A */
44 cmap_M3B, /* ATI Rage Mobility M3 Head B */
45 cmap_radeon, /* ATI Radeon */
46 cmap_gxt2000, /* IBM GXT2000 */
47 cmap_avivo, /* ATI R5xx */
48 cmap_qemu, /* qemu vga */
49 };
50
51 struct offb_par {
52 volatile void __iomem *cmap_adr;
53 volatile void __iomem *cmap_data;
54 int cmap_type;
55 int blanked;
56 };
57
58 struct offb_par default_par;
59
60 #ifdef CONFIG_PPC32
61 extern boot_infos_t *boot_infos;
62 #endif
63
64 /* Definitions used by the Avivo palette hack */
65 #define AVIVO_DC_LUT_RW_SELECT 0x6480
66 #define AVIVO_DC_LUT_RW_MODE 0x6484
67 #define AVIVO_DC_LUT_RW_INDEX 0x6488
68 #define AVIVO_DC_LUT_SEQ_COLOR 0x648c
69 #define AVIVO_DC_LUT_PWL_DATA 0x6490
70 #define AVIVO_DC_LUT_30_COLOR 0x6494
71 #define AVIVO_DC_LUT_READ_PIPE_SELECT 0x6498
72 #define AVIVO_DC_LUT_WRITE_EN_MASK 0x649c
73 #define AVIVO_DC_LUT_AUTOFILL 0x64a0
74
75 #define AVIVO_DC_LUTA_CONTROL 0x64c0
76 #define AVIVO_DC_LUTA_BLACK_OFFSET_BLUE 0x64c4
77 #define AVIVO_DC_LUTA_BLACK_OFFSET_GREEN 0x64c8
78 #define AVIVO_DC_LUTA_BLACK_OFFSET_RED 0x64cc
79 #define AVIVO_DC_LUTA_WHITE_OFFSET_BLUE 0x64d0
80 #define AVIVO_DC_LUTA_WHITE_OFFSET_GREEN 0x64d4
81 #define AVIVO_DC_LUTA_WHITE_OFFSET_RED 0x64d8
82
83 #define AVIVO_DC_LUTB_CONTROL 0x6cc0
84 #define AVIVO_DC_LUTB_BLACK_OFFSET_BLUE 0x6cc4
85 #define AVIVO_DC_LUTB_BLACK_OFFSET_GREEN 0x6cc8
86 #define AVIVO_DC_LUTB_BLACK_OFFSET_RED 0x6ccc
87 #define AVIVO_DC_LUTB_WHITE_OFFSET_BLUE 0x6cd0
88 #define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN 0x6cd4
89 #define AVIVO_DC_LUTB_WHITE_OFFSET_RED 0x6cd8
90
91 /*
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.
95 */
96
offb_setcolreg(u_int regno,u_int red,u_int green,u_int blue,u_int transp,struct fb_info * info)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)
99 {
100 struct offb_par *par = (struct offb_par *) info->par;
101
102 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
103 u32 *pal = info->pseudo_palette;
104 u32 cr = red >> (16 - info->var.red.length);
105 u32 cg = green >> (16 - info->var.green.length);
106 u32 cb = blue >> (16 - info->var.blue.length);
107 u32 value;
108
109 if (regno >= 16)
110 return -EINVAL;
111
112 value = (cr << info->var.red.offset) |
113 (cg << info->var.green.offset) |
114 (cb << info->var.blue.offset);
115 if (info->var.transp.length > 0) {
116 u32 mask = (1 << info->var.transp.length) - 1;
117 mask <<= info->var.transp.offset;
118 value |= mask;
119 }
120 pal[regno] = value;
121 return 0;
122 }
123
124 if (regno > 255)
125 return -EINVAL;
126
127 red >>= 8;
128 green >>= 8;
129 blue >>= 8;
130
131 if (!par->cmap_adr)
132 return 0;
133
134 switch (par->cmap_type) {
135 case cmap_simple:
136 writeb(regno, par->cmap_adr);
137 writeb(red, par->cmap_data);
138 writeb(green, par->cmap_data);
139 writeb(blue, par->cmap_data);
140 break;
141 case cmap_M3A:
142 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
143 out_le32(par->cmap_adr + 0x58,
144 in_le32(par->cmap_adr + 0x58) & ~0x20);
145 fallthrough;
146 case cmap_r128:
147 /* Set palette index & data */
148 out_8(par->cmap_adr + 0xb0, regno);
149 out_le32(par->cmap_adr + 0xb4,
150 (red << 16 | green << 8 | blue));
151 break;
152 case cmap_M3B:
153 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
154 out_le32(par->cmap_adr + 0x58,
155 in_le32(par->cmap_adr + 0x58) | 0x20);
156 /* Set palette index & data */
157 out_8(par->cmap_adr + 0xb0, regno);
158 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
159 break;
160 case cmap_radeon:
161 /* Set palette index & data (could be smarter) */
162 out_8(par->cmap_adr + 0xb0, regno);
163 out_le32(par->cmap_adr + 0xb4, (red << 16 | green << 8 | blue));
164 break;
165 case cmap_gxt2000:
166 out_le32(((unsigned __iomem *) par->cmap_adr) + regno,
167 (red << 16 | green << 8 | blue));
168 break;
169 case cmap_avivo:
170 /* Write to both LUTs for now */
171 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
172 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
173 writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
174 par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
175 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
176 writeb(regno, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
177 writel(((red) << 22) | ((green) << 12) | ((blue) << 2),
178 par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
179 break;
180 }
181
182 return 0;
183 }
184
185 /*
186 * Blank the display.
187 */
188
offb_blank(int blank,struct fb_info * info)189 static int offb_blank(int blank, struct fb_info *info)
190 {
191 struct offb_par *par = (struct offb_par *) info->par;
192 int i, j;
193
194 if (!par->cmap_adr)
195 return 0;
196
197 if (!par->blanked)
198 if (!blank)
199 return 0;
200
201 par->blanked = blank;
202
203 if (blank)
204 for (i = 0; i < 256; i++) {
205 switch (par->cmap_type) {
206 case cmap_simple:
207 writeb(i, par->cmap_adr);
208 for (j = 0; j < 3; j++)
209 writeb(0, par->cmap_data);
210 break;
211 case cmap_M3A:
212 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
213 out_le32(par->cmap_adr + 0x58,
214 in_le32(par->cmap_adr + 0x58) & ~0x20);
215 fallthrough;
216 case cmap_r128:
217 /* Set palette index & data */
218 out_8(par->cmap_adr + 0xb0, i);
219 out_le32(par->cmap_adr + 0xb4, 0);
220 break;
221 case cmap_M3B:
222 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
223 out_le32(par->cmap_adr + 0x58,
224 in_le32(par->cmap_adr + 0x58) | 0x20);
225 /* Set palette index & data */
226 out_8(par->cmap_adr + 0xb0, i);
227 out_le32(par->cmap_adr + 0xb4, 0);
228 break;
229 case cmap_radeon:
230 out_8(par->cmap_adr + 0xb0, i);
231 out_le32(par->cmap_adr + 0xb4, 0);
232 break;
233 case cmap_gxt2000:
234 out_le32(((unsigned __iomem *) par->cmap_adr) + i,
235 0);
236 break;
237 case cmap_avivo:
238 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
239 writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
240 writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
241 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
242 writeb(i, par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
243 writel(0, par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
244 break;
245 }
246 } else
247 fb_set_cmap(&info->cmap, info);
248 return 0;
249 }
250
offb_set_par(struct fb_info * info)251 static int offb_set_par(struct fb_info *info)
252 {
253 struct offb_par *par = (struct offb_par *) info->par;
254
255 /* On avivo, initialize palette control */
256 if (par->cmap_type == cmap_avivo) {
257 writel(0, par->cmap_adr + AVIVO_DC_LUTA_CONTROL);
258 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_BLUE);
259 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_GREEN);
260 writel(0, par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_RED);
261 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_BLUE);
262 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_GREEN);
263 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_RED);
264 writel(0, par->cmap_adr + AVIVO_DC_LUTB_CONTROL);
265 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_BLUE);
266 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_GREEN);
267 writel(0, par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_RED);
268 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_BLUE);
269 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_GREEN);
270 writel(0x0000ffff, par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_RED);
271 writel(1, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
272 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
273 writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
274 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
275 writel(0, par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
276 writel(0x0000003f, par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
277 }
278 return 0;
279 }
280
offb_destroy(struct fb_info * info)281 static void offb_destroy(struct fb_info *info)
282 {
283 if (info->screen_base)
284 iounmap(info->screen_base);
285 release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
286 fb_dealloc_cmap(&info->cmap);
287 framebuffer_release(info);
288 }
289
290 static const 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
offb_map_reg(struct device_node * np,int index,unsigned long offset,unsigned long size)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
offb_init_palette_hacks(struct fb_info * info,struct device_node * dp,unsigned long address)323 static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp,
324 unsigned long address)
325 {
326 struct offb_par *par = (struct offb_par *) info->par;
327
328 if (of_node_name_prefix(dp, "ATY,Rage128")) {
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 (of_node_name_prefix(dp, "ATY,RageM3pA") ||
333 of_node_name_prefix(dp, "ATY,RageM3p12A")) {
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 (of_node_name_prefix(dp, "ATY,RageM3pB")) {
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 (of_node_name_prefix(dp, "ATY,Rage6")) {
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 (of_node_name_prefix(dp, "ATY,")) {
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 (of_node_name_prefix(dp, "vga,Display-")) {
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
offb_init_fb(struct platform_device * parent,const char * name,int width,int height,int depth,int pitch,unsigned long address,int foreign_endian,struct device_node * dp)390 static void offb_init_fb(struct platform_device *parent, const char *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 "%pOF: can't use depth = %d\n", dp, depth);
410 release_mem_region(res_start, res_size);
411 return;
412 }
413
414 info = framebuffer_alloc(sizeof(u32) * 16, &parent->dev);
415
416 if (!info) {
417 release_mem_region(res_start, res_size);
418 return;
419 }
420 platform_set_drvdata(parent, info);
421
422 fix = &info->fix;
423 var = &info->var;
424 info->par = par;
425
426 if (name) {
427 strcpy(fix->id, "OFfb ");
428 strncat(fix->id, name, sizeof(fix->id) - sizeof("OFfb "));
429 fix->id[sizeof(fix->id) - 1] = '\0';
430 } else
431 snprintf(fix->id, sizeof(fix->id), "OFfb %pOFn", dp);
432
433
434 var->xres = var->xres_virtual = width;
435 var->yres = var->yres_virtual = height;
436 fix->line_length = pitch;
437
438 fix->smem_start = address;
439 fix->smem_len = pitch * height;
440 fix->type = FB_TYPE_PACKED_PIXELS;
441 fix->type_aux = 0;
442
443 par->cmap_type = cmap_unknown;
444 if (depth == 8)
445 offb_init_palette_hacks(info, dp, address);
446 else
447 fix->visual = FB_VISUAL_TRUECOLOR;
448
449 var->xoffset = var->yoffset = 0;
450 switch (depth) {
451 case 8:
452 var->bits_per_pixel = 8;
453 var->red.offset = 0;
454 var->red.length = 8;
455 var->green.offset = 0;
456 var->green.length = 8;
457 var->blue.offset = 0;
458 var->blue.length = 8;
459 var->transp.offset = 0;
460 var->transp.length = 0;
461 break;
462 case 15: /* RGB 555 */
463 var->bits_per_pixel = 16;
464 var->red.offset = 10;
465 var->red.length = 5;
466 var->green.offset = 5;
467 var->green.length = 5;
468 var->blue.offset = 0;
469 var->blue.length = 5;
470 var->transp.offset = 0;
471 var->transp.length = 0;
472 break;
473 case 16: /* RGB 565 */
474 var->bits_per_pixel = 16;
475 var->red.offset = 11;
476 var->red.length = 5;
477 var->green.offset = 5;
478 var->green.length = 6;
479 var->blue.offset = 0;
480 var->blue.length = 5;
481 var->transp.offset = 0;
482 var->transp.length = 0;
483 break;
484 case 32: /* RGB 888 */
485 var->bits_per_pixel = 32;
486 var->red.offset = 16;
487 var->red.length = 8;
488 var->green.offset = 8;
489 var->green.length = 8;
490 var->blue.offset = 0;
491 var->blue.length = 8;
492 var->transp.offset = 24;
493 var->transp.length = 8;
494 break;
495 }
496 var->red.msb_right = var->green.msb_right = var->blue.msb_right =
497 var->transp.msb_right = 0;
498 var->grayscale = 0;
499 var->nonstd = 0;
500 var->activate = 0;
501 var->height = var->width = -1;
502 var->pixclock = 10000;
503 var->left_margin = var->right_margin = 16;
504 var->upper_margin = var->lower_margin = 16;
505 var->hsync_len = var->vsync_len = 8;
506 var->sync = 0;
507 var->vmode = FB_VMODE_NONINTERLACED;
508
509 /* set offb aperture size for generic probing */
510 info->apertures = alloc_apertures(1);
511 if (!info->apertures)
512 goto out_aper;
513 info->apertures->ranges[0].base = address;
514 info->apertures->ranges[0].size = fix->smem_len;
515
516 info->fbops = &offb_ops;
517 info->screen_base = ioremap(address, fix->smem_len);
518 info->pseudo_palette = (void *) (info + 1);
519 info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE | foreign_endian;
520
521 fb_alloc_cmap(&info->cmap, 256, 0);
522
523 if (register_framebuffer(info) < 0)
524 goto out_err;
525
526 fb_info(info, "Open Firmware frame buffer device on %pOF\n", dp);
527 return;
528
529 out_err:
530 fb_dealloc_cmap(&info->cmap);
531 iounmap(info->screen_base);
532 out_aper:
533 iounmap(par->cmap_adr);
534 par->cmap_adr = NULL;
535 framebuffer_release(info);
536 release_mem_region(res_start, res_size);
537 }
538
539
offb_init_nodriver(struct platform_device * parent,struct device_node * dp,int no_real_node)540 static void offb_init_nodriver(struct platform_device *parent, struct device_node *dp,
541 int no_real_node)
542 {
543 unsigned int len;
544 int i, width = 640, height = 480, depth = 8, pitch = 640;
545 unsigned int flags, rsize, addr_prop = 0;
546 unsigned long max_size = 0;
547 u64 rstart, address = OF_BAD_ADDR;
548 const __be32 *pp, *addrp, *up;
549 u64 asize;
550 int foreign_endian = 0;
551
552 #ifdef __BIG_ENDIAN
553 if (of_get_property(dp, "little-endian", NULL))
554 foreign_endian = FBINFO_FOREIGN_ENDIAN;
555 #else
556 if (of_get_property(dp, "big-endian", NULL))
557 foreign_endian = FBINFO_FOREIGN_ENDIAN;
558 #endif
559
560 pp = of_get_property(dp, "linux,bootx-depth", &len);
561 if (pp == NULL)
562 pp = of_get_property(dp, "depth", &len);
563 if (pp && len == sizeof(u32))
564 depth = be32_to_cpup(pp);
565
566 pp = of_get_property(dp, "linux,bootx-width", &len);
567 if (pp == NULL)
568 pp = of_get_property(dp, "width", &len);
569 if (pp && len == sizeof(u32))
570 width = be32_to_cpup(pp);
571
572 pp = of_get_property(dp, "linux,bootx-height", &len);
573 if (pp == NULL)
574 pp = of_get_property(dp, "height", &len);
575 if (pp && len == sizeof(u32))
576 height = be32_to_cpup(pp);
577
578 pp = of_get_property(dp, "linux,bootx-linebytes", &len);
579 if (pp == NULL)
580 pp = of_get_property(dp, "linebytes", &len);
581 if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
582 pitch = be32_to_cpup(pp);
583 else
584 pitch = width * ((depth + 7) / 8);
585
586 rsize = (unsigned long)pitch * (unsigned long)height;
587
588 /* Ok, now we try to figure out the address of the framebuffer.
589 *
590 * Unfortunately, Open Firmware doesn't provide a standard way to do
591 * so. All we can do is a dodgy heuristic that happens to work in
592 * practice. On most machines, the "address" property contains what
593 * we need, though not on Matrox cards found in IBM machines. What I've
594 * found that appears to give good results is to go through the PCI
595 * ranges and pick one that is both big enough and if possible encloses
596 * the "address" property. If none match, we pick the biggest
597 */
598 up = of_get_property(dp, "linux,bootx-addr", &len);
599 if (up == NULL)
600 up = of_get_property(dp, "address", &len);
601 if (up && len == sizeof(u32))
602 addr_prop = *up;
603
604 /* Hack for when BootX is passing us */
605 if (no_real_node)
606 goto skip_addr;
607
608 for (i = 0; (addrp = of_get_address(dp, i, &asize, &flags))
609 != NULL; i++) {
610 int match_addrp = 0;
611
612 if (!(flags & IORESOURCE_MEM))
613 continue;
614 if (asize < rsize)
615 continue;
616 rstart = of_translate_address(dp, addrp);
617 if (rstart == OF_BAD_ADDR)
618 continue;
619 if (addr_prop && (rstart <= addr_prop) &&
620 ((rstart + asize) >= (addr_prop + rsize)))
621 match_addrp = 1;
622 if (match_addrp) {
623 address = addr_prop;
624 break;
625 }
626 if (rsize > max_size) {
627 max_size = rsize;
628 address = OF_BAD_ADDR;
629 }
630
631 if (address == OF_BAD_ADDR)
632 address = rstart;
633 }
634 skip_addr:
635 if (address == OF_BAD_ADDR && addr_prop)
636 address = (u64)addr_prop;
637 if (address != OF_BAD_ADDR) {
638 #ifdef CONFIG_PCI
639 const __be32 *vidp, *didp;
640 u32 vid, did;
641 struct pci_dev *pdev;
642
643 vidp = of_get_property(dp, "vendor-id", NULL);
644 didp = of_get_property(dp, "device-id", NULL);
645 if (vidp && didp) {
646 vid = be32_to_cpup(vidp);
647 did = be32_to_cpup(didp);
648 pdev = pci_get_device(vid, did, NULL);
649 if (!pdev || pci_enable_device(pdev))
650 return;
651 }
652 #endif
653 /* kludge for valkyrie */
654 if (of_node_name_eq(dp, "valkyrie"))
655 address += 0x1000;
656 offb_init_fb(parent, no_real_node ? "bootx" : NULL,
657 width, height, depth, pitch, address,
658 foreign_endian, no_real_node ? NULL : dp);
659 }
660 }
661
offb_remove(struct platform_device * pdev)662 static int offb_remove(struct platform_device *pdev)
663 {
664 struct fb_info *info = platform_get_drvdata(pdev);
665
666 if (info)
667 unregister_framebuffer(info);
668
669 return 0;
670 }
671
offb_probe_bootx_noscreen(struct platform_device * pdev)672 static int offb_probe_bootx_noscreen(struct platform_device *pdev)
673 {
674 offb_init_nodriver(pdev, of_chosen, 1);
675
676 return 0;
677 }
678
679 static struct platform_driver offb_driver_bootx_noscreen = {
680 .driver = {
681 .name = "bootx-noscreen",
682 },
683 .probe = offb_probe_bootx_noscreen,
684 .remove = offb_remove,
685 };
686
offb_probe_display(struct platform_device * pdev)687 static int offb_probe_display(struct platform_device *pdev)
688 {
689 offb_init_nodriver(pdev, pdev->dev.of_node, 0);
690
691 return 0;
692 }
693
694 static const struct of_device_id offb_of_match_display[] = {
695 { .compatible = "display", },
696 { },
697 };
698 MODULE_DEVICE_TABLE(of, offb_of_match_display);
699
700 static struct platform_driver offb_driver_display = {
701 .driver = {
702 .name = "of-display",
703 .of_match_table = offb_of_match_display,
704 },
705 .probe = offb_probe_display,
706 .remove = offb_remove,
707 };
708
offb_init(void)709 static int __init offb_init(void)
710 {
711 if (fb_get_options("offb", NULL))
712 return -ENODEV;
713
714 platform_driver_register(&offb_driver_bootx_noscreen);
715 platform_driver_register(&offb_driver_display);
716
717 return 0;
718 }
719 module_init(offb_init);
720
offb_exit(void)721 static void __exit offb_exit(void)
722 {
723 platform_driver_unregister(&offb_driver_display);
724 platform_driver_unregister(&offb_driver_bootx_noscreen);
725 }
726 module_exit(offb_exit);
727
728 MODULE_LICENSE("GPL");
729