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/aperture.h>
16#include <linux/module.h>
17#include <linux/kernel.h>
18#include <linux/errno.h>
19#include <linux/string.h>
20#include <linux/mm.h>
21#include <linux/vmalloc.h>
22#include <linux/delay.h>
23#include <linux/of.h>
24#include <linux/of_address.h>
25#include <linux/interrupt.h>
26#include <linux/fb.h>
27#include <linux/init.h>
28#include <linux/ioport.h>
29#include <linux/pci.h>
30#include <linux/platform_device.h>
31#include <asm/io.h>
32
33#ifdef CONFIG_PPC32
34#include <asm/bootx.h>
35#endif
36
37#include "macmodes.h"
38
39/* Supported palette hacks */
40enum {
41 cmap_unknown,
42 cmap_simple, /* ATI Mach64 */
43 cmap_r128, /* ATI Rage128 */
44 cmap_M3A, /* ATI Rage Mobility M3 Head A */
45 cmap_M3B, /* ATI Rage Mobility M3 Head B */
46 cmap_radeon, /* ATI Radeon */
47 cmap_gxt2000, /* IBM GXT2000 */
48 cmap_avivo, /* ATI R5xx */
49 cmap_qemu, /* qemu vga */
50};
51
52struct offb_par {
53 volatile void __iomem *cmap_adr;
54 volatile void __iomem *cmap_data;
55 int cmap_type;
56 int blanked;
57 u32 pseudo_palette[16];
58 resource_size_t base;
59 resource_size_t size;
60};
61
62#ifdef CONFIG_PPC32
63extern boot_infos_t *boot_infos;
64#endif
65
66/* Definitions used by the Avivo palette hack */
67#define AVIVO_DC_LUT_RW_SELECT 0x6480
68#define AVIVO_DC_LUT_RW_MODE 0x6484
69#define AVIVO_DC_LUT_RW_INDEX 0x6488
70#define AVIVO_DC_LUT_SEQ_COLOR 0x648c
71#define AVIVO_DC_LUT_PWL_DATA 0x6490
72#define AVIVO_DC_LUT_30_COLOR 0x6494
73#define AVIVO_DC_LUT_READ_PIPE_SELECT 0x6498
74#define AVIVO_DC_LUT_WRITE_EN_MASK 0x649c
75#define AVIVO_DC_LUT_AUTOFILL 0x64a0
76
77#define AVIVO_DC_LUTA_CONTROL 0x64c0
78#define AVIVO_DC_LUTA_BLACK_OFFSET_BLUE 0x64c4
79#define AVIVO_DC_LUTA_BLACK_OFFSET_GREEN 0x64c8
80#define AVIVO_DC_LUTA_BLACK_OFFSET_RED 0x64cc
81#define AVIVO_DC_LUTA_WHITE_OFFSET_BLUE 0x64d0
82#define AVIVO_DC_LUTA_WHITE_OFFSET_GREEN 0x64d4
83#define AVIVO_DC_LUTA_WHITE_OFFSET_RED 0x64d8
84
85#define AVIVO_DC_LUTB_CONTROL 0x6cc0
86#define AVIVO_DC_LUTB_BLACK_OFFSET_BLUE 0x6cc4
87#define AVIVO_DC_LUTB_BLACK_OFFSET_GREEN 0x6cc8
88#define AVIVO_DC_LUTB_BLACK_OFFSET_RED 0x6ccc
89#define AVIVO_DC_LUTB_WHITE_OFFSET_BLUE 0x6cd0
90#define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN 0x6cd4
91#define AVIVO_DC_LUTB_WHITE_OFFSET_RED 0x6cd8
92
93 /*
94 * Set a single color register. The values supplied are already
95 * rounded down to the hardware's capabilities (according to the
96 * entries in the var structure). Return != 0 for invalid regno.
97 */
98
99static int offb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
100 u_int transp, struct fb_info *info)
101{
102 struct offb_par *par = (struct offb_par *) info->par;
103
104 if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
105 u32 *pal = info->pseudo_palette;
106 u32 cr = red >> (16 - info->var.red.length);
107 u32 cg = green >> (16 - info->var.green.length);
108 u32 cb = blue >> (16 - info->var.blue.length);
109 u32 value;
110
111 if (regno >= 16)
112 return -EINVAL;
113
114 value = (cr << info->var.red.offset) |
115 (cg << info->var.green.offset) |
116 (cb << info->var.blue.offset);
117 if (info->var.transp.length > 0) {
118 u32 mask = (1 << info->var.transp.length) - 1;
119 mask <<= info->var.transp.offset;
120 value |= mask;
121 }
122 pal[regno] = value;
123 return 0;
124 }
125
126 if (regno > 255)
127 return -EINVAL;
128
129 red >>= 8;
130 green >>= 8;
131 blue >>= 8;
132
133 if (!par->cmap_adr)
134 return 0;
135
136 switch (par->cmap_type) {
137 case cmap_simple:
138 writeb(val: regno, addr: par->cmap_adr);
139 writeb(val: red, addr: par->cmap_data);
140 writeb(val: green, addr: par->cmap_data);
141 writeb(val: blue, addr: par->cmap_data);
142 break;
143 case cmap_M3A:
144 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
145 out_le32(par->cmap_adr + 0x58,
146 in_le32(par->cmap_adr + 0x58) & ~0x20);
147 fallthrough;
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(val: 1, addr: par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
174 writeb(val: regno, addr: par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
175 writel(val: ((red) << 22) | ((green) << 12) | ((blue) << 2),
176 addr: par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
177 writel(val: 0, addr: par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
178 writeb(val: regno, addr: par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
179 writel(val: ((red) << 22) | ((green) << 12) | ((blue) << 2),
180 addr: par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
181 break;
182 }
183
184 return 0;
185}
186
187 /*
188 * Blank the display.
189 */
190
191static 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(val: i, addr: par->cmap_adr);
210 for (j = 0; j < 3; j++)
211 writeb(val: 0, addr: 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 fallthrough;
218 case cmap_r128:
219 /* Set palette index & data */
220 out_8(par->cmap_adr + 0xb0, i);
221 out_le32(par->cmap_adr + 0xb4, 0);
222 break;
223 case cmap_M3B:
224 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
225 out_le32(par->cmap_adr + 0x58,
226 in_le32(par->cmap_adr + 0x58) | 0x20);
227 /* Set palette index & data */
228 out_8(par->cmap_adr + 0xb0, i);
229 out_le32(par->cmap_adr + 0xb4, 0);
230 break;
231 case cmap_radeon:
232 out_8(par->cmap_adr + 0xb0, i);
233 out_le32(par->cmap_adr + 0xb4, 0);
234 break;
235 case cmap_gxt2000:
236 out_le32(((unsigned __iomem *) par->cmap_adr) + i,
237 0);
238 break;
239 case cmap_avivo:
240 writel(val: 1, addr: par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
241 writeb(val: i, addr: par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
242 writel(val: 0, addr: par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
243 writel(val: 0, addr: par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
244 writeb(val: i, addr: par->cmap_adr + AVIVO_DC_LUT_RW_INDEX);
245 writel(val: 0, addr: par->cmap_adr + AVIVO_DC_LUT_30_COLOR);
246 break;
247 }
248 } else
249 fb_set_cmap(cmap: &info->cmap, fb_info: info);
250 return 0;
251}
252
253static int offb_set_par(struct fb_info *info)
254{
255 struct offb_par *par = (struct offb_par *) info->par;
256
257 /* On avivo, initialize palette control */
258 if (par->cmap_type == cmap_avivo) {
259 writel(val: 0, addr: par->cmap_adr + AVIVO_DC_LUTA_CONTROL);
260 writel(val: 0, addr: par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_BLUE);
261 writel(val: 0, addr: par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_GREEN);
262 writel(val: 0, addr: par->cmap_adr + AVIVO_DC_LUTA_BLACK_OFFSET_RED);
263 writel(val: 0x0000ffff, addr: par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_BLUE);
264 writel(val: 0x0000ffff, addr: par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_GREEN);
265 writel(val: 0x0000ffff, addr: par->cmap_adr + AVIVO_DC_LUTA_WHITE_OFFSET_RED);
266 writel(val: 0, addr: par->cmap_adr + AVIVO_DC_LUTB_CONTROL);
267 writel(val: 0, addr: par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_BLUE);
268 writel(val: 0, addr: par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_GREEN);
269 writel(val: 0, addr: par->cmap_adr + AVIVO_DC_LUTB_BLACK_OFFSET_RED);
270 writel(val: 0x0000ffff, addr: par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_BLUE);
271 writel(val: 0x0000ffff, addr: par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_GREEN);
272 writel(val: 0x0000ffff, addr: par->cmap_adr + AVIVO_DC_LUTB_WHITE_OFFSET_RED);
273 writel(val: 1, addr: par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
274 writel(val: 0, addr: par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
275 writel(val: 0x0000003f, addr: par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
276 writel(val: 0, addr: par->cmap_adr + AVIVO_DC_LUT_RW_SELECT);
277 writel(val: 0, addr: par->cmap_adr + AVIVO_DC_LUT_RW_MODE);
278 writel(val: 0x0000003f, addr: par->cmap_adr + AVIVO_DC_LUT_WRITE_EN_MASK);
279 }
280 return 0;
281}
282
283static void offb_destroy(struct fb_info *info)
284{
285 struct offb_par *par = info->par;
286
287 if (info->screen_base)
288 iounmap(addr: info->screen_base);
289 release_mem_region(par->base, par->size);
290 fb_dealloc_cmap(cmap: &info->cmap);
291 framebuffer_release(info);
292}
293
294static const struct fb_ops offb_ops = {
295 .owner = THIS_MODULE,
296 FB_DEFAULT_IOMEM_OPS,
297 .fb_destroy = offb_destroy,
298 .fb_setcolreg = offb_setcolreg,
299 .fb_set_par = offb_set_par,
300 .fb_blank = offb_blank,
301};
302
303static void __iomem *offb_map_reg(struct device_node *np, int index,
304 unsigned long offset, unsigned long size)
305{
306 const __be32 *addrp;
307 u64 asize, taddr;
308 unsigned int flags;
309
310 addrp = of_get_pci_address(dev: np, bar_no: index, size: &asize, flags: &flags);
311 if (addrp == NULL)
312 addrp = of_get_address(dev: np, index, size: &asize, flags: &flags);
313 if (addrp == NULL)
314 return NULL;
315 if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
316 return NULL;
317 if ((offset + size) > asize)
318 return NULL;
319 taddr = of_translate_address(np, addr: addrp);
320 if (taddr == OF_BAD_ADDR)
321 return NULL;
322 return ioremap(offset: taddr + offset, size);
323}
324
325static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp,
326 unsigned long address)
327{
328 struct offb_par *par = (struct offb_par *) info->par;
329
330 if (of_node_name_prefix(np: dp, prefix: "ATY,Rage128")) {
331 par->cmap_adr = offb_map_reg(np: dp, index: 2, offset: 0, size: 0x1fff);
332 if (par->cmap_adr)
333 par->cmap_type = cmap_r128;
334 } else if (of_node_name_prefix(np: dp, prefix: "ATY,RageM3pA") ||
335 of_node_name_prefix(np: dp, prefix: "ATY,RageM3p12A")) {
336 par->cmap_adr = offb_map_reg(np: dp, index: 2, offset: 0, size: 0x1fff);
337 if (par->cmap_adr)
338 par->cmap_type = cmap_M3A;
339 } else if (of_node_name_prefix(np: dp, prefix: "ATY,RageM3pB")) {
340 par->cmap_adr = offb_map_reg(np: dp, index: 2, offset: 0, size: 0x1fff);
341 if (par->cmap_adr)
342 par->cmap_type = cmap_M3B;
343 } else if (of_node_name_prefix(np: dp, prefix: "ATY,Rage6")) {
344 par->cmap_adr = offb_map_reg(np: dp, index: 1, offset: 0, size: 0x1fff);
345 if (par->cmap_adr)
346 par->cmap_type = cmap_radeon;
347 } else if (of_node_name_prefix(np: dp, prefix: "ATY,")) {
348 unsigned long base = address & 0xff000000UL;
349 par->cmap_adr =
350 ioremap(offset: base + 0x7ff000, size: 0x1000) + 0xcc0;
351 par->cmap_data = par->cmap_adr + 1;
352 par->cmap_type = cmap_simple;
353 } else if (dp && (of_device_is_compatible(device: dp, "pci1014,b7") ||
354 of_device_is_compatible(device: dp, "pci1014,21c"))) {
355 par->cmap_adr = offb_map_reg(np: dp, index: 0, offset: 0x6000, size: 0x1000);
356 if (par->cmap_adr)
357 par->cmap_type = cmap_gxt2000;
358 } else if (of_node_name_prefix(np: dp, prefix: "vga,Display-")) {
359 /* Look for AVIVO initialized by SLOF */
360 struct device_node *pciparent = of_get_parent(node: dp);
361 const u32 *vid, *did;
362 vid = of_get_property(node: pciparent, name: "vendor-id", NULL);
363 did = of_get_property(node: pciparent, name: "device-id", NULL);
364 /* This will match most R5xx */
365 if (vid && did && *vid == 0x1002 &&
366 ((*did >= 0x7100 && *did < 0x7800) ||
367 (*did >= 0x9400))) {
368 par->cmap_adr = offb_map_reg(np: pciparent, index: 2, offset: 0, size: 0x10000);
369 if (par->cmap_adr)
370 par->cmap_type = cmap_avivo;
371 }
372 of_node_put(node: pciparent);
373 } else if (dp && of_device_is_compatible(device: dp, "qemu,std-vga")) {
374#ifdef __BIG_ENDIAN
375 const __be32 io_of_addr[3] = { 0x01000000, 0x0, 0x0 };
376#else
377 const __be32 io_of_addr[3] = { 0x00000001, 0x0, 0x0 };
378#endif
379 u64 io_addr = of_translate_address(np: dp, addr: io_of_addr);
380 if (io_addr != OF_BAD_ADDR) {
381 par->cmap_adr = ioremap(offset: io_addr + 0x3c8, size: 2);
382 if (par->cmap_adr) {
383 par->cmap_type = cmap_simple;
384 par->cmap_data = par->cmap_adr + 1;
385 }
386 }
387 }
388 info->fix.visual = (par->cmap_type != cmap_unknown) ?
389 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_STATIC_PSEUDOCOLOR;
390}
391
392static void offb_init_fb(struct platform_device *parent, const char *name,
393 int width, int height, int depth,
394 int pitch, unsigned long address,
395 int foreign_endian, struct device_node *dp)
396{
397 unsigned long res_size = pitch * height;
398 unsigned long res_start = address;
399 struct fb_fix_screeninfo *fix;
400 struct fb_var_screeninfo *var;
401 struct fb_info *info;
402 struct offb_par *par;
403
404 if (!request_mem_region(res_start, res_size, "offb"))
405 return;
406
407 printk(KERN_INFO
408 "Using unsupported %dx%d %s at %lx, depth=%d, pitch=%d\n",
409 width, height, name, address, depth, pitch);
410 if (depth != 8 && depth != 15 && depth != 16 && depth != 32) {
411 printk(KERN_ERR "%pOF: can't use depth = %d\n", dp, depth);
412 release_mem_region(res_start, res_size);
413 return;
414 }
415
416 info = framebuffer_alloc(size: sizeof(*par), dev: &parent->dev);
417 if (!info) {
418 release_mem_region(res_start, res_size);
419 return;
420 }
421 platform_set_drvdata(pdev: parent, data: info);
422 par = info->par;
423 fix = &info->fix;
424 var = &info->var;
425
426 if (name)
427 snprintf(buf: fix->id, size: sizeof(fix->id), fmt: "OFfb %s", name);
428 else
429 snprintf(buf: fix->id, size: sizeof(fix->id), fmt: "OFfb %pOFn", dp);
430
431
432 var->xres = var->xres_virtual = width;
433 var->yres = var->yres_virtual = height;
434 fix->line_length = pitch;
435
436 fix->smem_start = address;
437 fix->smem_len = pitch * height;
438 fix->type = FB_TYPE_PACKED_PIXELS;
439 fix->type_aux = 0;
440
441 par->cmap_type = cmap_unknown;
442 if (depth == 8)
443 offb_init_palette_hacks(info, dp, address);
444 else
445 fix->visual = FB_VISUAL_TRUECOLOR;
446
447 var->xoffset = var->yoffset = 0;
448 switch (depth) {
449 case 8:
450 var->bits_per_pixel = 8;
451 var->red.offset = 0;
452 var->red.length = 8;
453 var->green.offset = 0;
454 var->green.length = 8;
455 var->blue.offset = 0;
456 var->blue.length = 8;
457 var->transp.offset = 0;
458 var->transp.length = 0;
459 break;
460 case 15: /* RGB 555 */
461 var->bits_per_pixel = 16;
462 var->red.offset = 10;
463 var->red.length = 5;
464 var->green.offset = 5;
465 var->green.length = 5;
466 var->blue.offset = 0;
467 var->blue.length = 5;
468 var->transp.offset = 0;
469 var->transp.length = 0;
470 break;
471 case 16: /* RGB 565 */
472 var->bits_per_pixel = 16;
473 var->red.offset = 11;
474 var->red.length = 5;
475 var->green.offset = 5;
476 var->green.length = 6;
477 var->blue.offset = 0;
478 var->blue.length = 5;
479 var->transp.offset = 0;
480 var->transp.length = 0;
481 break;
482 case 32: /* RGB 888 */
483 var->bits_per_pixel = 32;
484 var->red.offset = 16;
485 var->red.length = 8;
486 var->green.offset = 8;
487 var->green.length = 8;
488 var->blue.offset = 0;
489 var->blue.length = 8;
490 var->transp.offset = 24;
491 var->transp.length = 8;
492 break;
493 }
494 var->red.msb_right = var->green.msb_right = var->blue.msb_right =
495 var->transp.msb_right = 0;
496 var->grayscale = 0;
497 var->nonstd = 0;
498 var->activate = 0;
499 var->height = var->width = -1;
500 var->pixclock = 10000;
501 var->left_margin = var->right_margin = 16;
502 var->upper_margin = var->lower_margin = 16;
503 var->hsync_len = var->vsync_len = 8;
504 var->sync = 0;
505 var->vmode = FB_VMODE_NONINTERLACED;
506
507 par->base = address;
508 par->size = fix->smem_len;
509
510 info->fbops = &offb_ops;
511 info->screen_base = ioremap(offset: address, size: fix->smem_len);
512 info->pseudo_palette = par->pseudo_palette;
513 info->flags = foreign_endian;
514
515 fb_alloc_cmap(cmap: &info->cmap, len: 256, transp: 0);
516
517 if (devm_aperture_acquire_for_platform_device(pdev: parent, base: par->base, size: par->size) < 0)
518 goto out_err;
519 if (register_framebuffer(fb_info: info) < 0)
520 goto out_err;
521
522 fb_info(info, "Open Firmware frame buffer device on %pOF\n", dp);
523 return;
524
525out_err:
526 fb_dealloc_cmap(cmap: &info->cmap);
527 iounmap(addr: info->screen_base);
528 iounmap(addr: par->cmap_adr);
529 par->cmap_adr = NULL;
530 framebuffer_release(info);
531 release_mem_region(res_start, res_size);
532}
533
534
535static void offb_init_nodriver(struct platform_device *parent, struct device_node *dp,
536 int no_real_node)
537{
538 unsigned int len;
539 int i, width = 640, height = 480, depth = 8, pitch = 640;
540 unsigned int flags, rsize, addr_prop = 0;
541 unsigned long max_size = 0;
542 u64 rstart, address = OF_BAD_ADDR;
543 const __be32 *pp, *addrp, *up;
544 u64 asize;
545 int foreign_endian = 0;
546
547#ifdef __BIG_ENDIAN
548 if (of_property_read_bool(dp, "little-endian"))
549 foreign_endian = FBINFO_FOREIGN_ENDIAN;
550#else
551 if (of_property_read_bool(np: dp, propname: "big-endian"))
552 foreign_endian = FBINFO_FOREIGN_ENDIAN;
553#endif
554
555 pp = of_get_property(node: dp, name: "linux,bootx-depth", lenp: &len);
556 if (pp == NULL)
557 pp = of_get_property(node: dp, name: "depth", lenp: &len);
558 if (pp && len == sizeof(u32))
559 depth = be32_to_cpup(p: pp);
560
561 pp = of_get_property(node: dp, name: "linux,bootx-width", lenp: &len);
562 if (pp == NULL)
563 pp = of_get_property(node: dp, name: "width", lenp: &len);
564 if (pp && len == sizeof(u32))
565 width = be32_to_cpup(p: pp);
566
567 pp = of_get_property(node: dp, name: "linux,bootx-height", lenp: &len);
568 if (pp == NULL)
569 pp = of_get_property(node: dp, name: "height", lenp: &len);
570 if (pp && len == sizeof(u32))
571 height = be32_to_cpup(p: pp);
572
573 pp = of_get_property(node: dp, name: "linux,bootx-linebytes", lenp: &len);
574 if (pp == NULL)
575 pp = of_get_property(node: dp, name: "linebytes", lenp: &len);
576 if (pp && len == sizeof(u32) && (*pp != 0xffffffffu))
577 pitch = be32_to_cpup(p: pp);
578 else
579 pitch = width * ((depth + 7) / 8);
580
581 rsize = (unsigned long)pitch * (unsigned long)height;
582
583 /* Ok, now we try to figure out the address of the framebuffer.
584 *
585 * Unfortunately, Open Firmware doesn't provide a standard way to do
586 * so. All we can do is a dodgy heuristic that happens to work in
587 * practice. On most machines, the "address" property contains what
588 * we need, though not on Matrox cards found in IBM machines. What I've
589 * found that appears to give good results is to go through the PCI
590 * ranges and pick one that is both big enough and if possible encloses
591 * the "address" property. If none match, we pick the biggest
592 */
593 up = of_get_property(node: dp, name: "linux,bootx-addr", lenp: &len);
594 if (up == NULL)
595 up = of_get_property(node: dp, name: "address", lenp: &len);
596 if (up && len == sizeof(u32))
597 addr_prop = *up;
598
599 /* Hack for when BootX is passing us */
600 if (no_real_node)
601 goto skip_addr;
602
603 for (i = 0; (addrp = of_get_address(dev: dp, index: i, size: &asize, flags: &flags))
604 != NULL; i++) {
605 int match_addrp = 0;
606
607 if (!(flags & IORESOURCE_MEM))
608 continue;
609 if (asize < rsize)
610 continue;
611 rstart = of_translate_address(np: dp, addr: addrp);
612 if (rstart == OF_BAD_ADDR)
613 continue;
614 if (addr_prop && (rstart <= addr_prop) &&
615 ((rstart + asize) >= (addr_prop + rsize)))
616 match_addrp = 1;
617 if (match_addrp) {
618 address = addr_prop;
619 break;
620 }
621 if (rsize > max_size) {
622 max_size = rsize;
623 address = OF_BAD_ADDR;
624 }
625
626 if (address == OF_BAD_ADDR)
627 address = rstart;
628 }
629 skip_addr:
630 if (address == OF_BAD_ADDR && addr_prop)
631 address = (u64)addr_prop;
632 if (address != OF_BAD_ADDR) {
633#ifdef CONFIG_PCI
634 const __be32 *vidp, *didp;
635 u32 vid, did;
636 struct pci_dev *pdev;
637
638 vidp = of_get_property(node: dp, name: "vendor-id", NULL);
639 didp = of_get_property(node: dp, name: "device-id", NULL);
640 if (vidp && didp) {
641 vid = be32_to_cpup(p: vidp);
642 did = be32_to_cpup(p: didp);
643 pdev = pci_get_device(vendor: vid, device: did, NULL);
644 if (!pdev || pci_enable_device(dev: pdev))
645 return;
646 }
647#endif
648 /* kludge for valkyrie */
649 if (of_node_name_eq(np: dp, name: "valkyrie"))
650 address += 0x1000;
651 offb_init_fb(parent, name: no_real_node ? "bootx" : NULL,
652 width, height, depth, pitch, address,
653 foreign_endian, dp: no_real_node ? NULL : dp);
654 }
655}
656
657static void offb_remove(struct platform_device *pdev)
658{
659 struct fb_info *info = platform_get_drvdata(pdev);
660
661 if (info)
662 unregister_framebuffer(fb_info: info);
663}
664
665static int offb_probe_bootx_noscreen(struct platform_device *pdev)
666{
667 offb_init_nodriver(parent: pdev, dp: of_chosen, no_real_node: 1);
668
669 return 0;
670}
671
672static struct platform_driver offb_driver_bootx_noscreen = {
673 .driver = {
674 .name = "bootx-noscreen",
675 },
676 .probe = offb_probe_bootx_noscreen,
677 .remove_new = offb_remove,
678};
679
680static int offb_probe_display(struct platform_device *pdev)
681{
682 offb_init_nodriver(parent: pdev, dp: pdev->dev.of_node, no_real_node: 0);
683
684 return 0;
685}
686
687static const struct of_device_id offb_of_match_display[] = {
688 { .compatible = "display", },
689 { },
690};
691MODULE_DEVICE_TABLE(of, offb_of_match_display);
692
693static struct platform_driver offb_driver_display = {
694 .driver = {
695 .name = "of-display",
696 .of_match_table = offb_of_match_display,
697 },
698 .probe = offb_probe_display,
699 .remove_new = offb_remove,
700};
701
702static int __init offb_init(void)
703{
704 if (fb_get_options(name: "offb", NULL))
705 return -ENODEV;
706
707 platform_driver_register(&offb_driver_bootx_noscreen);
708 platform_driver_register(&offb_driver_display);
709
710 return 0;
711}
712module_init(offb_init);
713
714static void __exit offb_exit(void)
715{
716 platform_driver_unregister(&offb_driver_display);
717 platform_driver_unregister(&offb_driver_bootx_noscreen);
718}
719module_exit(offb_exit);
720
721MODULE_LICENSE("GPL");
722

source code of linux/drivers/video/fbdev/offb.c