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-rw-r--r--drivers/video/fbdev/acornfb.c1143
1 files changed, 1143 insertions, 0 deletions
diff --git a/drivers/video/fbdev/acornfb.c b/drivers/video/fbdev/acornfb.c
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index 000000000000..a305caea58ee
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1/*
2 * linux/drivers/video/acornfb.c
3 *
4 * Copyright (C) 1998-2001 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Frame buffer code for Acorn platforms
11 *
12 * NOTE: Most of the modes with X!=640 will disappear shortly.
13 * NOTE: Startup setting of HS & VS polarity not supported.
14 * (do we need to support it if we're coming up in 640x480?)
15 *
16 * FIXME: (things broken by the "new improved" FBCON API)
17 * - Blanking 8bpp displays with VIDC
18 */
19
20#include <linux/module.h>
21#include <linux/kernel.h>
22#include <linux/errno.h>
23#include <linux/string.h>
24#include <linux/ctype.h>
25#include <linux/mm.h>
26#include <linux/init.h>
27#include <linux/fb.h>
28#include <linux/platform_device.h>
29#include <linux/dma-mapping.h>
30#include <linux/io.h>
31#include <linux/gfp.h>
32
33#include <mach/hardware.h>
34#include <asm/irq.h>
35#include <asm/mach-types.h>
36#include <asm/pgtable.h>
37
38#include "acornfb.h"
39
40/*
41 * Default resolution.
42 * NOTE that it has to be supported in the table towards
43 * the end of this file.
44 */
45#define DEFAULT_XRES 640
46#define DEFAULT_YRES 480
47#define DEFAULT_BPP 4
48
49/*
50 * define this to debug the video mode selection
51 */
52#undef DEBUG_MODE_SELECTION
53
54/*
55 * Translation from RISC OS monitor types to actual
56 * HSYNC and VSYNC frequency ranges. These are
57 * probably not right, but they're the best info I
58 * have. Allow 1% either way on the nominal for TVs.
59 */
60#define NR_MONTYPES 6
61static struct fb_monspecs monspecs[NR_MONTYPES] = {
62 { /* TV */
63 .hfmin = 15469,
64 .hfmax = 15781,
65 .vfmin = 49,
66 .vfmax = 51,
67 }, { /* Multi Freq */
68 .hfmin = 0,
69 .hfmax = 99999,
70 .vfmin = 0,
71 .vfmax = 199,
72 }, { /* Hi-res mono */
73 .hfmin = 58608,
74 .hfmax = 58608,
75 .vfmin = 64,
76 .vfmax = 64,
77 }, { /* VGA */
78 .hfmin = 30000,
79 .hfmax = 70000,
80 .vfmin = 60,
81 .vfmax = 60,
82 }, { /* SVGA */
83 .hfmin = 30000,
84 .hfmax = 70000,
85 .vfmin = 56,
86 .vfmax = 75,
87 }, {
88 .hfmin = 30000,
89 .hfmax = 70000,
90 .vfmin = 60,
91 .vfmax = 60,
92 }
93};
94
95static struct fb_info fb_info;
96static struct acornfb_par current_par;
97static struct vidc_timing current_vidc;
98
99extern unsigned int vram_size; /* set by setup.c */
100
101#ifdef HAS_VIDC20
102#include <mach/acornfb.h>
103
104#define MAX_SIZE 2*1024*1024
105
106/* VIDC20 has a different set of rules from the VIDC:
107 * hcr : must be multiple of 4
108 * hswr : must be even
109 * hdsr : must be even
110 * hder : must be even
111 * vcr : >= 2, (interlace, must be odd)
112 * vswr : >= 1
113 * vdsr : >= 1
114 * vder : >= vdsr
115 */
116static void acornfb_set_timing(struct fb_info *info)
117{
118 struct fb_var_screeninfo *var = &info->var;
119 struct vidc_timing vidc;
120 u_int vcr, fsize;
121 u_int ext_ctl, dat_ctl;
122 u_int words_per_line;
123
124 memset(&vidc, 0, sizeof(vidc));
125
126 vidc.h_sync_width = var->hsync_len - 8;
127 vidc.h_border_start = vidc.h_sync_width + var->left_margin + 8 - 12;
128 vidc.h_display_start = vidc.h_border_start + 12 - 18;
129 vidc.h_display_end = vidc.h_display_start + var->xres;
130 vidc.h_border_end = vidc.h_display_end + 18 - 12;
131 vidc.h_cycle = vidc.h_border_end + var->right_margin + 12 - 8;
132 vidc.h_interlace = vidc.h_cycle / 2;
133 vidc.v_sync_width = var->vsync_len - 1;
134 vidc.v_border_start = vidc.v_sync_width + var->upper_margin;
135 vidc.v_display_start = vidc.v_border_start;
136 vidc.v_display_end = vidc.v_display_start + var->yres;
137 vidc.v_border_end = vidc.v_display_end;
138 vidc.control = acornfb_default_control();
139
140 vcr = var->vsync_len + var->upper_margin + var->yres +
141 var->lower_margin;
142
143 if ((var->vmode & FB_VMODE_MASK) == FB_VMODE_INTERLACED) {
144 vidc.v_cycle = (vcr - 3) / 2;
145 vidc.control |= VIDC20_CTRL_INT;
146 } else
147 vidc.v_cycle = vcr - 2;
148
149 switch (var->bits_per_pixel) {
150 case 1: vidc.control |= VIDC20_CTRL_1BPP; break;
151 case 2: vidc.control |= VIDC20_CTRL_2BPP; break;
152 case 4: vidc.control |= VIDC20_CTRL_4BPP; break;
153 default:
154 case 8: vidc.control |= VIDC20_CTRL_8BPP; break;
155 case 16: vidc.control |= VIDC20_CTRL_16BPP; break;
156 case 32: vidc.control |= VIDC20_CTRL_32BPP; break;
157 }
158
159 acornfb_vidc20_find_rates(&vidc, var);
160 fsize = var->vsync_len + var->upper_margin + var->lower_margin - 1;
161
162 if (memcmp(&current_vidc, &vidc, sizeof(vidc))) {
163 current_vidc = vidc;
164
165 vidc_writel(VIDC20_CTRL| vidc.control);
166 vidc_writel(0xd0000000 | vidc.pll_ctl);
167 vidc_writel(0x80000000 | vidc.h_cycle);
168 vidc_writel(0x81000000 | vidc.h_sync_width);
169 vidc_writel(0x82000000 | vidc.h_border_start);
170 vidc_writel(0x83000000 | vidc.h_display_start);
171 vidc_writel(0x84000000 | vidc.h_display_end);
172 vidc_writel(0x85000000 | vidc.h_border_end);
173 vidc_writel(0x86000000);
174 vidc_writel(0x87000000 | vidc.h_interlace);
175 vidc_writel(0x90000000 | vidc.v_cycle);
176 vidc_writel(0x91000000 | vidc.v_sync_width);
177 vidc_writel(0x92000000 | vidc.v_border_start);
178 vidc_writel(0x93000000 | vidc.v_display_start);
179 vidc_writel(0x94000000 | vidc.v_display_end);
180 vidc_writel(0x95000000 | vidc.v_border_end);
181 vidc_writel(0x96000000);
182 vidc_writel(0x97000000);
183 }
184
185 iomd_writel(fsize, IOMD_FSIZE);
186
187 ext_ctl = acornfb_default_econtrol();
188
189 if (var->sync & FB_SYNC_COMP_HIGH_ACT) /* should be FB_SYNC_COMP */
190 ext_ctl |= VIDC20_ECTL_HS_NCSYNC | VIDC20_ECTL_VS_NCSYNC;
191 else {
192 if (var->sync & FB_SYNC_HOR_HIGH_ACT)
193 ext_ctl |= VIDC20_ECTL_HS_HSYNC;
194 else
195 ext_ctl |= VIDC20_ECTL_HS_NHSYNC;
196
197 if (var->sync & FB_SYNC_VERT_HIGH_ACT)
198 ext_ctl |= VIDC20_ECTL_VS_VSYNC;
199 else
200 ext_ctl |= VIDC20_ECTL_VS_NVSYNC;
201 }
202
203 vidc_writel(VIDC20_ECTL | ext_ctl);
204
205 words_per_line = var->xres * var->bits_per_pixel / 32;
206
207 if (current_par.using_vram && info->fix.smem_len == 2048*1024)
208 words_per_line /= 2;
209
210 /* RiscPC doesn't use the VIDC's VRAM control. */
211 dat_ctl = VIDC20_DCTL_VRAM_DIS | VIDC20_DCTL_SNA | words_per_line;
212
213 /* The data bus width is dependent on both the type
214 * and amount of video memory.
215 * DRAM 32bit low
216 * 1MB VRAM 32bit
217 * 2MB VRAM 64bit
218 */
219 if (current_par.using_vram && current_par.vram_half_sam == 2048)
220 dat_ctl |= VIDC20_DCTL_BUS_D63_0;
221 else
222 dat_ctl |= VIDC20_DCTL_BUS_D31_0;
223
224 vidc_writel(VIDC20_DCTL | dat_ctl);
225
226#ifdef DEBUG_MODE_SELECTION
227 printk(KERN_DEBUG "VIDC registers for %dx%dx%d:\n", var->xres,
228 var->yres, var->bits_per_pixel);
229 printk(KERN_DEBUG " H-cycle : %d\n", vidc.h_cycle);
230 printk(KERN_DEBUG " H-sync-width : %d\n", vidc.h_sync_width);
231 printk(KERN_DEBUG " H-border-start : %d\n", vidc.h_border_start);
232 printk(KERN_DEBUG " H-display-start : %d\n", vidc.h_display_start);
233 printk(KERN_DEBUG " H-display-end : %d\n", vidc.h_display_end);
234 printk(KERN_DEBUG " H-border-end : %d\n", vidc.h_border_end);
235 printk(KERN_DEBUG " H-interlace : %d\n", vidc.h_interlace);
236 printk(KERN_DEBUG " V-cycle : %d\n", vidc.v_cycle);
237 printk(KERN_DEBUG " V-sync-width : %d\n", vidc.v_sync_width);
238 printk(KERN_DEBUG " V-border-start : %d\n", vidc.v_border_start);
239 printk(KERN_DEBUG " V-display-start : %d\n", vidc.v_display_start);
240 printk(KERN_DEBUG " V-display-end : %d\n", vidc.v_display_end);
241 printk(KERN_DEBUG " V-border-end : %d\n", vidc.v_border_end);
242 printk(KERN_DEBUG " Ext Ctrl (C) : 0x%08X\n", ext_ctl);
243 printk(KERN_DEBUG " PLL Ctrl (D) : 0x%08X\n", vidc.pll_ctl);
244 printk(KERN_DEBUG " Ctrl (E) : 0x%08X\n", vidc.control);
245 printk(KERN_DEBUG " Data Ctrl (F) : 0x%08X\n", dat_ctl);
246 printk(KERN_DEBUG " Fsize : 0x%08X\n", fsize);
247#endif
248}
249
250/*
251 * We have to take note of the VIDC20's 16-bit palette here.
252 * The VIDC20 looks up a 16 bit pixel as follows:
253 *
254 * bits 111111
255 * 5432109876543210
256 * red ++++++++ (8 bits, 7 to 0)
257 * green ++++++++ (8 bits, 11 to 4)
258 * blue ++++++++ (8 bits, 15 to 8)
259 *
260 * We use a pixel which looks like:
261 *
262 * bits 111111
263 * 5432109876543210
264 * red +++++ (5 bits, 4 to 0)
265 * green +++++ (5 bits, 9 to 5)
266 * blue +++++ (5 bits, 14 to 10)
267 */
268static int
269acornfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
270 u_int trans, struct fb_info *info)
271{
272 union palette pal;
273
274 if (regno >= current_par.palette_size)
275 return 1;
276
277 if (regno < 16 && info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
278 u32 pseudo_val;
279
280 pseudo_val = regno << info->var.red.offset;
281 pseudo_val |= regno << info->var.green.offset;
282 pseudo_val |= regno << info->var.blue.offset;
283
284 ((u32 *)info->pseudo_palette)[regno] = pseudo_val;
285 }
286
287 pal.p = 0;
288 pal.vidc20.red = red >> 8;
289 pal.vidc20.green = green >> 8;
290 pal.vidc20.blue = blue >> 8;
291
292 current_par.palette[regno] = pal;
293
294 if (info->var.bits_per_pixel == 16) {
295 int i;
296
297 pal.p = 0;
298 vidc_writel(0x10000000);
299 for (i = 0; i < 256; i += 1) {
300 pal.vidc20.red = current_par.palette[ i & 31].vidc20.red;
301 pal.vidc20.green = current_par.palette[(i >> 1) & 31].vidc20.green;
302 pal.vidc20.blue = current_par.palette[(i >> 2) & 31].vidc20.blue;
303 vidc_writel(pal.p);
304 /* Palette register pointer auto-increments */
305 }
306 } else {
307 vidc_writel(0x10000000 | regno);
308 vidc_writel(pal.p);
309 }
310
311 return 0;
312}
313#endif
314
315/*
316 * Before selecting the timing parameters, adjust
317 * the resolution to fit the rules.
318 */
319static int
320acornfb_adjust_timing(struct fb_info *info, struct fb_var_screeninfo *var, u_int fontht)
321{
322 u_int font_line_len, sam_size, min_size, size, nr_y;
323
324 /* xres must be even */
325 var->xres = (var->xres + 1) & ~1;
326
327 /*
328 * We don't allow xres_virtual to differ from xres
329 */
330 var->xres_virtual = var->xres;
331 var->xoffset = 0;
332
333 if (current_par.using_vram)
334 sam_size = current_par.vram_half_sam * 2;
335 else
336 sam_size = 16;
337
338 /*
339 * Now, find a value for yres_virtual which allows
340 * us to do ywrap scrolling. The value of
341 * yres_virtual must be such that the end of the
342 * displayable frame buffer must be aligned with
343 * the start of a font line.
344 */
345 font_line_len = var->xres * var->bits_per_pixel * fontht / 8;
346 min_size = var->xres * var->yres * var->bits_per_pixel / 8;
347
348 /*
349 * If minimum screen size is greater than that we have
350 * available, reject it.
351 */
352 if (min_size > info->fix.smem_len)
353 return -EINVAL;
354
355 /* Find int 'y', such that y * fll == s * sam < maxsize
356 * y = s * sam / fll; s = maxsize / sam
357 */
358 for (size = info->fix.smem_len;
359 nr_y = size / font_line_len, min_size <= size;
360 size -= sam_size) {
361 if (nr_y * font_line_len == size)
362 break;
363 }
364 nr_y *= fontht;
365
366 if (var->accel_flags & FB_ACCELF_TEXT) {
367 if (min_size > size) {
368 /*
369 * failed, use ypan
370 */
371 size = info->fix.smem_len;
372 var->yres_virtual = size / (font_line_len / fontht);
373 } else
374 var->yres_virtual = nr_y;
375 } else if (var->yres_virtual > nr_y)
376 var->yres_virtual = nr_y;
377
378 current_par.screen_end = info->fix.smem_start + size;
379
380 /*
381 * Fix yres & yoffset if needed.
382 */
383 if (var->yres > var->yres_virtual)
384 var->yres = var->yres_virtual;
385
386 if (var->vmode & FB_VMODE_YWRAP) {
387 if (var->yoffset > var->yres_virtual)
388 var->yoffset = var->yres_virtual;
389 } else {
390 if (var->yoffset + var->yres > var->yres_virtual)
391 var->yoffset = var->yres_virtual - var->yres;
392 }
393
394 /* hsync_len must be even */
395 var->hsync_len = (var->hsync_len + 1) & ~1;
396
397#if defined(HAS_VIDC20)
398 /* left_margin must be even */
399 if (var->left_margin & 1) {
400 var->left_margin += 1;
401 var->right_margin -= 1;
402 }
403
404 /* right_margin must be even */
405 if (var->right_margin & 1)
406 var->right_margin += 1;
407#endif
408
409 if (var->vsync_len < 1)
410 var->vsync_len = 1;
411
412 return 0;
413}
414
415static int
416acornfb_validate_timing(struct fb_var_screeninfo *var,
417 struct fb_monspecs *monspecs)
418{
419 unsigned long hs, vs;
420
421 /*
422 * hs(Hz) = 10^12 / (pixclock * xtotal)
423 * vs(Hz) = hs(Hz) / ytotal
424 *
425 * No need to do long long divisions or anything
426 * like that if you factor it correctly
427 */
428 hs = 1953125000 / var->pixclock;
429 hs = hs * 512 /
430 (var->xres + var->left_margin + var->right_margin + var->hsync_len);
431 vs = hs /
432 (var->yres + var->upper_margin + var->lower_margin + var->vsync_len);
433
434 return (vs >= monspecs->vfmin && vs <= monspecs->vfmax &&
435 hs >= monspecs->hfmin && hs <= monspecs->hfmax) ? 0 : -EINVAL;
436}
437
438static inline void
439acornfb_update_dma(struct fb_info *info, struct fb_var_screeninfo *var)
440{
441 u_int off = var->yoffset * info->fix.line_length;
442
443#if defined(HAS_MEMC)
444 memc_write(VDMA_INIT, off >> 2);
445#elif defined(HAS_IOMD)
446 iomd_writel(info->fix.smem_start + off, IOMD_VIDINIT);
447#endif
448}
449
450static int
451acornfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
452{
453 u_int fontht;
454 int err;
455
456 /*
457 * FIXME: Find the font height
458 */
459 fontht = 8;
460
461 var->red.msb_right = 0;
462 var->green.msb_right = 0;
463 var->blue.msb_right = 0;
464 var->transp.msb_right = 0;
465
466 switch (var->bits_per_pixel) {
467 case 1: case 2: case 4: case 8:
468 var->red.offset = 0;
469 var->red.length = var->bits_per_pixel;
470 var->green = var->red;
471 var->blue = var->red;
472 var->transp.offset = 0;
473 var->transp.length = 0;
474 break;
475
476#ifdef HAS_VIDC20
477 case 16:
478 var->red.offset = 0;
479 var->red.length = 5;
480 var->green.offset = 5;
481 var->green.length = 5;
482 var->blue.offset = 10;
483 var->blue.length = 5;
484 var->transp.offset = 15;
485 var->transp.length = 1;
486 break;
487
488 case 32:
489 var->red.offset = 0;
490 var->red.length = 8;
491 var->green.offset = 8;
492 var->green.length = 8;
493 var->blue.offset = 16;
494 var->blue.length = 8;
495 var->transp.offset = 24;
496 var->transp.length = 4;
497 break;
498#endif
499 default:
500 return -EINVAL;
501 }
502
503 /*
504 * Check to see if the pixel rate is valid.
505 */
506 if (!acornfb_valid_pixrate(var))
507 return -EINVAL;
508
509 /*
510 * Validate and adjust the resolution to
511 * match the video generator hardware.
512 */
513 err = acornfb_adjust_timing(info, var, fontht);
514 if (err)
515 return err;
516
517 /*
518 * Validate the timing against the
519 * monitor hardware.
520 */
521 return acornfb_validate_timing(var, &info->monspecs);
522}
523
524static int acornfb_set_par(struct fb_info *info)
525{
526 switch (info->var.bits_per_pixel) {
527 case 1:
528 current_par.palette_size = 2;
529 info->fix.visual = FB_VISUAL_MONO10;
530 break;
531 case 2:
532 current_par.palette_size = 4;
533 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
534 break;
535 case 4:
536 current_par.palette_size = 16;
537 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
538 break;
539 case 8:
540 current_par.palette_size = VIDC_PALETTE_SIZE;
541 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
542 break;
543#ifdef HAS_VIDC20
544 case 16:
545 current_par.palette_size = 32;
546 info->fix.visual = FB_VISUAL_DIRECTCOLOR;
547 break;
548 case 32:
549 current_par.palette_size = VIDC_PALETTE_SIZE;
550 info->fix.visual = FB_VISUAL_DIRECTCOLOR;
551 break;
552#endif
553 default:
554 BUG();
555 }
556
557 info->fix.line_length = (info->var.xres * info->var.bits_per_pixel) / 8;
558
559#if defined(HAS_MEMC)
560 {
561 unsigned long size = info->fix.smem_len - VDMA_XFERSIZE;
562
563 memc_write(VDMA_START, 0);
564 memc_write(VDMA_END, size >> 2);
565 }
566#elif defined(HAS_IOMD)
567 {
568 unsigned long start, size;
569 u_int control;
570
571 start = info->fix.smem_start;
572 size = current_par.screen_end;
573
574 if (current_par.using_vram) {
575 size -= current_par.vram_half_sam;
576 control = DMA_CR_E | (current_par.vram_half_sam / 256);
577 } else {
578 size -= 16;
579 control = DMA_CR_E | DMA_CR_D | 16;
580 }
581
582 iomd_writel(start, IOMD_VIDSTART);
583 iomd_writel(size, IOMD_VIDEND);
584 iomd_writel(control, IOMD_VIDCR);
585 }
586#endif
587
588 acornfb_update_dma(info, &info->var);
589 acornfb_set_timing(info);
590
591 return 0;
592}
593
594static int
595acornfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
596{
597 u_int y_bottom = var->yoffset;
598
599 if (!(var->vmode & FB_VMODE_YWRAP))
600 y_bottom += info->var.yres;
601
602 if (y_bottom > info->var.yres_virtual)
603 return -EINVAL;
604
605 acornfb_update_dma(info, var);
606
607 return 0;
608}
609
610static struct fb_ops acornfb_ops = {
611 .owner = THIS_MODULE,
612 .fb_check_var = acornfb_check_var,
613 .fb_set_par = acornfb_set_par,
614 .fb_setcolreg = acornfb_setcolreg,
615 .fb_pan_display = acornfb_pan_display,
616 .fb_fillrect = cfb_fillrect,
617 .fb_copyarea = cfb_copyarea,
618 .fb_imageblit = cfb_imageblit,
619};
620
621/*
622 * Everything after here is initialisation!!!
623 */
624static struct fb_videomode modedb[] = {
625 { /* 320x256 @ 50Hz */
626 NULL, 50, 320, 256, 125000, 92, 62, 35, 19, 38, 2,
627 FB_SYNC_COMP_HIGH_ACT,
628 FB_VMODE_NONINTERLACED
629 }, { /* 640x250 @ 50Hz, 15.6 kHz hsync */
630 NULL, 50, 640, 250, 62500, 185, 123, 38, 21, 76, 3,
631 0,
632 FB_VMODE_NONINTERLACED
633 }, { /* 640x256 @ 50Hz, 15.6 kHz hsync */
634 NULL, 50, 640, 256, 62500, 185, 123, 35, 18, 76, 3,
635 0,
636 FB_VMODE_NONINTERLACED
637 }, { /* 640x512 @ 50Hz, 26.8 kHz hsync */
638 NULL, 50, 640, 512, 41667, 113, 87, 18, 1, 56, 3,
639 0,
640 FB_VMODE_NONINTERLACED
641 }, { /* 640x250 @ 70Hz, 31.5 kHz hsync */
642 NULL, 70, 640, 250, 39722, 48, 16, 109, 88, 96, 2,
643 0,
644 FB_VMODE_NONINTERLACED
645 }, { /* 640x256 @ 70Hz, 31.5 kHz hsync */
646 NULL, 70, 640, 256, 39722, 48, 16, 106, 85, 96, 2,
647 0,
648 FB_VMODE_NONINTERLACED
649 }, { /* 640x352 @ 70Hz, 31.5 kHz hsync */
650 NULL, 70, 640, 352, 39722, 48, 16, 58, 37, 96, 2,
651 0,
652 FB_VMODE_NONINTERLACED
653 }, { /* 640x480 @ 60Hz, 31.5 kHz hsync */
654 NULL, 60, 640, 480, 39722, 48, 16, 32, 11, 96, 2,
655 0,
656 FB_VMODE_NONINTERLACED
657 }, { /* 800x600 @ 56Hz, 35.2 kHz hsync */
658 NULL, 56, 800, 600, 27778, 101, 23, 22, 1, 100, 2,
659 0,
660 FB_VMODE_NONINTERLACED
661 }, { /* 896x352 @ 60Hz, 21.8 kHz hsync */
662 NULL, 60, 896, 352, 41667, 59, 27, 9, 0, 118, 3,
663 0,
664 FB_VMODE_NONINTERLACED
665 }, { /* 1024x 768 @ 60Hz, 48.4 kHz hsync */
666 NULL, 60, 1024, 768, 15385, 160, 24, 29, 3, 136, 6,
667 0,
668 FB_VMODE_NONINTERLACED
669 }, { /* 1280x1024 @ 60Hz, 63.8 kHz hsync */
670 NULL, 60, 1280, 1024, 9090, 186, 96, 38, 1, 160, 3,
671 0,
672 FB_VMODE_NONINTERLACED
673 }
674};
675
676static struct fb_videomode acornfb_default_mode = {
677 .name = NULL,
678 .refresh = 60,
679 .xres = 640,
680 .yres = 480,
681 .pixclock = 39722,
682 .left_margin = 56,
683 .right_margin = 16,
684 .upper_margin = 34,
685 .lower_margin = 9,
686 .hsync_len = 88,
687 .vsync_len = 2,
688 .sync = 0,
689 .vmode = FB_VMODE_NONINTERLACED
690};
691
692static void acornfb_init_fbinfo(void)
693{
694 static int first = 1;
695
696 if (!first)
697 return;
698 first = 0;
699
700 fb_info.fbops = &acornfb_ops;
701 fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
702 fb_info.pseudo_palette = current_par.pseudo_palette;
703
704 strcpy(fb_info.fix.id, "Acorn");
705 fb_info.fix.type = FB_TYPE_PACKED_PIXELS;
706 fb_info.fix.type_aux = 0;
707 fb_info.fix.xpanstep = 0;
708 fb_info.fix.ypanstep = 1;
709 fb_info.fix.ywrapstep = 1;
710 fb_info.fix.line_length = 0;
711 fb_info.fix.accel = FB_ACCEL_NONE;
712
713 /*
714 * setup initial parameters
715 */
716 memset(&fb_info.var, 0, sizeof(fb_info.var));
717
718#if defined(HAS_VIDC20)
719 fb_info.var.red.length = 8;
720 fb_info.var.transp.length = 4;
721#endif
722 fb_info.var.green = fb_info.var.red;
723 fb_info.var.blue = fb_info.var.red;
724 fb_info.var.nonstd = 0;
725 fb_info.var.activate = FB_ACTIVATE_NOW;
726 fb_info.var.height = -1;
727 fb_info.var.width = -1;
728 fb_info.var.vmode = FB_VMODE_NONINTERLACED;
729 fb_info.var.accel_flags = FB_ACCELF_TEXT;
730
731 current_par.dram_size = 0;
732 current_par.montype = -1;
733 current_par.dpms = 0;
734}
735
736/*
737 * setup acornfb options:
738 *
739 * mon:hmin-hmax:vmin-vmax:dpms:width:height
740 * Set monitor parameters:
741 * hmin = horizontal minimum frequency (Hz)
742 * hmax = horizontal maximum frequency (Hz) (optional)
743 * vmin = vertical minimum frequency (Hz)
744 * vmax = vertical maximum frequency (Hz) (optional)
745 * dpms = DPMS supported? (optional)
746 * width = width of picture in mm. (optional)
747 * height = height of picture in mm. (optional)
748 *
749 * montype:type
750 * Set RISC-OS style monitor type:
751 * 0 (or tv) - TV frequency
752 * 1 (or multi) - Multi frequency
753 * 2 (or hires) - Hi-res monochrome
754 * 3 (or vga) - VGA
755 * 4 (or svga) - SVGA
756 * auto, or option missing
757 * - try hardware detect
758 *
759 * dram:size
760 * Set the amount of DRAM to use for the frame buffer
761 * (even if you have VRAM).
762 * size can optionally be followed by 'M' or 'K' for
763 * MB or KB respectively.
764 */
765static void acornfb_parse_mon(char *opt)
766{
767 char *p = opt;
768
769 current_par.montype = -2;
770
771 fb_info.monspecs.hfmin = simple_strtoul(p, &p, 0);
772 if (*p == '-')
773 fb_info.monspecs.hfmax = simple_strtoul(p + 1, &p, 0);
774 else
775 fb_info.monspecs.hfmax = fb_info.monspecs.hfmin;
776
777 if (*p != ':')
778 goto bad;
779
780 fb_info.monspecs.vfmin = simple_strtoul(p + 1, &p, 0);
781 if (*p == '-')
782 fb_info.monspecs.vfmax = simple_strtoul(p + 1, &p, 0);
783 else
784 fb_info.monspecs.vfmax = fb_info.monspecs.vfmin;
785
786 if (*p != ':')
787 goto check_values;
788
789 fb_info.monspecs.dpms = simple_strtoul(p + 1, &p, 0);
790
791 if (*p != ':')
792 goto check_values;
793
794 fb_info.var.width = simple_strtoul(p + 1, &p, 0);
795
796 if (*p != ':')
797 goto check_values;
798
799 fb_info.var.height = simple_strtoul(p + 1, NULL, 0);
800
801check_values:
802 if (fb_info.monspecs.hfmax < fb_info.monspecs.hfmin ||
803 fb_info.monspecs.vfmax < fb_info.monspecs.vfmin)
804 goto bad;
805 return;
806
807bad:
808 printk(KERN_ERR "Acornfb: bad monitor settings: %s\n", opt);
809 current_par.montype = -1;
810}
811
812static void acornfb_parse_montype(char *opt)
813{
814 current_par.montype = -2;
815
816 if (strncmp(opt, "tv", 2) == 0) {
817 opt += 2;
818 current_par.montype = 0;
819 } else if (strncmp(opt, "multi", 5) == 0) {
820 opt += 5;
821 current_par.montype = 1;
822 } else if (strncmp(opt, "hires", 5) == 0) {
823 opt += 5;
824 current_par.montype = 2;
825 } else if (strncmp(opt, "vga", 3) == 0) {
826 opt += 3;
827 current_par.montype = 3;
828 } else if (strncmp(opt, "svga", 4) == 0) {
829 opt += 4;
830 current_par.montype = 4;
831 } else if (strncmp(opt, "auto", 4) == 0) {
832 opt += 4;
833 current_par.montype = -1;
834 } else if (isdigit(*opt))
835 current_par.montype = simple_strtoul(opt, &opt, 0);
836
837 if (current_par.montype == -2 ||
838 current_par.montype > NR_MONTYPES) {
839 printk(KERN_ERR "acornfb: unknown monitor type: %s\n",
840 opt);
841 current_par.montype = -1;
842 } else
843 if (opt && *opt) {
844 if (strcmp(opt, ",dpms") == 0)
845 current_par.dpms = 1;
846 else
847 printk(KERN_ERR
848 "acornfb: unknown monitor option: %s\n",
849 opt);
850 }
851}
852
853static void acornfb_parse_dram(char *opt)
854{
855 unsigned int size;
856
857 size = simple_strtoul(opt, &opt, 0);
858
859 if (opt) {
860 switch (*opt) {
861 case 'M':
862 case 'm':
863 size *= 1024;
864 case 'K':
865 case 'k':
866 size *= 1024;
867 default:
868 break;
869 }
870 }
871
872 current_par.dram_size = size;
873}
874
875static struct options {
876 char *name;
877 void (*parse)(char *opt);
878} opt_table[] = {
879 { "mon", acornfb_parse_mon },
880 { "montype", acornfb_parse_montype },
881 { "dram", acornfb_parse_dram },
882 { NULL, NULL }
883};
884
885static int acornfb_setup(char *options)
886{
887 struct options *optp;
888 char *opt;
889
890 if (!options || !*options)
891 return 0;
892
893 acornfb_init_fbinfo();
894
895 while ((opt = strsep(&options, ",")) != NULL) {
896 if (!*opt)
897 continue;
898
899 for (optp = opt_table; optp->name; optp++) {
900 int optlen;
901
902 optlen = strlen(optp->name);
903
904 if (strncmp(opt, optp->name, optlen) == 0 &&
905 opt[optlen] == ':') {
906 optp->parse(opt + optlen + 1);
907 break;
908 }
909 }
910
911 if (!optp->name)
912 printk(KERN_ERR "acornfb: unknown parameter: %s\n",
913 opt);
914 }
915 return 0;
916}
917
918/*
919 * Detect type of monitor connected
920 * For now, we just assume SVGA
921 */
922static int acornfb_detect_monitortype(void)
923{
924 return 4;
925}
926
927/*
928 * This enables the unused memory to be freed on older Acorn machines.
929 * We are freeing memory on behalf of the architecture initialisation
930 * code here.
931 */
932static inline void
933free_unused_pages(unsigned int virtual_start, unsigned int virtual_end)
934{
935 int mb_freed = 0;
936
937 /*
938 * Align addresses
939 */
940 virtual_start = PAGE_ALIGN(virtual_start);
941 virtual_end = PAGE_ALIGN(virtual_end);
942
943 while (virtual_start < virtual_end) {
944 struct page *page;
945
946 /*
947 * Clear page reserved bit,
948 * set count to 1, and free
949 * the page.
950 */
951 page = virt_to_page(virtual_start);
952 __free_reserved_page(page);
953
954 virtual_start += PAGE_SIZE;
955 mb_freed += PAGE_SIZE / 1024;
956 }
957
958 printk("acornfb: freed %dK memory\n", mb_freed);
959}
960
961static int acornfb_probe(struct platform_device *dev)
962{
963 unsigned long size;
964 u_int h_sync, v_sync;
965 int rc, i;
966 char *option = NULL;
967
968 if (fb_get_options("acornfb", &option))
969 return -ENODEV;
970 acornfb_setup(option);
971
972 acornfb_init_fbinfo();
973
974 current_par.dev = &dev->dev;
975
976 if (current_par.montype == -1)
977 current_par.montype = acornfb_detect_monitortype();
978
979 if (current_par.montype == -1 || current_par.montype > NR_MONTYPES)
980 current_par.montype = 4;
981
982 if (current_par.montype >= 0) {
983 fb_info.monspecs = monspecs[current_par.montype];
984 fb_info.monspecs.dpms = current_par.dpms;
985 }
986
987 /*
988 * Try to select a suitable default mode
989 */
990 for (i = 0; i < ARRAY_SIZE(modedb); i++) {
991 unsigned long hs;
992
993 hs = modedb[i].refresh *
994 (modedb[i].yres + modedb[i].upper_margin +
995 modedb[i].lower_margin + modedb[i].vsync_len);
996 if (modedb[i].xres == DEFAULT_XRES &&
997 modedb[i].yres == DEFAULT_YRES &&
998 modedb[i].refresh >= fb_info.monspecs.vfmin &&
999 modedb[i].refresh <= fb_info.monspecs.vfmax &&
1000 hs >= fb_info.monspecs.hfmin &&
1001 hs <= fb_info.monspecs.hfmax) {
1002 acornfb_default_mode = modedb[i];
1003 break;
1004 }
1005 }
1006
1007 fb_info.screen_base = (char *)SCREEN_BASE;
1008 fb_info.fix.smem_start = SCREEN_START;
1009 current_par.using_vram = 0;
1010
1011 /*
1012 * If vram_size is set, we are using VRAM in
1013 * a Risc PC. However, if the user has specified
1014 * an amount of DRAM then use that instead.
1015 */
1016 if (vram_size && !current_par.dram_size) {
1017 size = vram_size;
1018 current_par.vram_half_sam = vram_size / 1024;
1019 current_par.using_vram = 1;
1020 } else if (current_par.dram_size)
1021 size = current_par.dram_size;
1022 else
1023 size = MAX_SIZE;
1024
1025 /*
1026 * Limit maximum screen size.
1027 */
1028 if (size > MAX_SIZE)
1029 size = MAX_SIZE;
1030
1031 size = PAGE_ALIGN(size);
1032
1033#if defined(HAS_VIDC20)
1034 if (!current_par.using_vram) {
1035 dma_addr_t handle;
1036 void *base;
1037
1038 /*
1039 * RiscPC needs to allocate the DRAM memory
1040 * for the framebuffer if we are not using
1041 * VRAM.
1042 */
1043 base = dma_alloc_writecombine(current_par.dev, size, &handle,
1044 GFP_KERNEL);
1045 if (base == NULL) {
1046 printk(KERN_ERR "acornfb: unable to allocate screen "
1047 "memory\n");
1048 return -ENOMEM;
1049 }
1050
1051 fb_info.screen_base = base;
1052 fb_info.fix.smem_start = handle;
1053 }
1054#endif
1055 fb_info.fix.smem_len = size;
1056 current_par.palette_size = VIDC_PALETTE_SIZE;
1057
1058 /*
1059 * Lookup the timing for this resolution. If we can't
1060 * find it, then we can't restore it if we change
1061 * the resolution, so we disable this feature.
1062 */
1063 do {
1064 rc = fb_find_mode(&fb_info.var, &fb_info, NULL, modedb,
1065 ARRAY_SIZE(modedb),
1066 &acornfb_default_mode, DEFAULT_BPP);
1067 /*
1068 * If we found an exact match, all ok.
1069 */
1070 if (rc == 1)
1071 break;
1072
1073 rc = fb_find_mode(&fb_info.var, &fb_info, NULL, NULL, 0,
1074 &acornfb_default_mode, DEFAULT_BPP);
1075 /*
1076 * If we found an exact match, all ok.
1077 */
1078 if (rc == 1)
1079 break;
1080
1081 rc = fb_find_mode(&fb_info.var, &fb_info, NULL, modedb,
1082 ARRAY_SIZE(modedb),
1083 &acornfb_default_mode, DEFAULT_BPP);
1084 if (rc)
1085 break;
1086
1087 rc = fb_find_mode(&fb_info.var, &fb_info, NULL, NULL, 0,
1088 &acornfb_default_mode, DEFAULT_BPP);
1089 } while (0);
1090
1091 /*
1092 * If we didn't find an exact match, try the
1093 * generic database.
1094 */
1095 if (rc == 0) {
1096 printk("Acornfb: no valid mode found\n");
1097 return -EINVAL;
1098 }
1099
1100 h_sync = 1953125000 / fb_info.var.pixclock;
1101 h_sync = h_sync * 512 / (fb_info.var.xres + fb_info.var.left_margin +
1102 fb_info.var.right_margin + fb_info.var.hsync_len);
1103 v_sync = h_sync / (fb_info.var.yres + fb_info.var.upper_margin +
1104 fb_info.var.lower_margin + fb_info.var.vsync_len);
1105
1106 printk(KERN_INFO "Acornfb: %dkB %cRAM, %s, using %dx%d, "
1107 "%d.%03dkHz, %dHz\n",
1108 fb_info.fix.smem_len / 1024,
1109 current_par.using_vram ? 'V' : 'D',
1110 VIDC_NAME, fb_info.var.xres, fb_info.var.yres,
1111 h_sync / 1000, h_sync % 1000, v_sync);
1112
1113 printk(KERN_INFO "Acornfb: Monitor: %d.%03d-%d.%03dkHz, %d-%dHz%s\n",
1114 fb_info.monspecs.hfmin / 1000, fb_info.monspecs.hfmin % 1000,
1115 fb_info.monspecs.hfmax / 1000, fb_info.monspecs.hfmax % 1000,
1116 fb_info.monspecs.vfmin, fb_info.monspecs.vfmax,
1117 fb_info.monspecs.dpms ? ", DPMS" : "");
1118
1119 if (fb_set_var(&fb_info, &fb_info.var))
1120 printk(KERN_ERR "Acornfb: unable to set display parameters\n");
1121
1122 if (register_framebuffer(&fb_info) < 0)
1123 return -EINVAL;
1124 return 0;
1125}
1126
1127static struct platform_driver acornfb_driver = {
1128 .probe = acornfb_probe,
1129 .driver = {
1130 .name = "acornfb",
1131 },
1132};
1133
1134static int __init acornfb_init(void)
1135{
1136 return platform_driver_register(&acornfb_driver);
1137}
1138
1139module_init(acornfb_init);
1140
1141MODULE_AUTHOR("Russell King");
1142MODULE_DESCRIPTION("VIDC 1/1a/20 framebuffer driver");
1143MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2025-10-01 09:18:01 -0400