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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/drivers/video/acornfb.c
4 *
5 * Copyright (C) 1998-2001 Russell King
6 *
7 * Frame buffer code for Acorn platforms
8 *
9 * NOTE: Most of the modes with X!=640 will disappear shortly.
10 * NOTE: Startup setting of HS & VS polarity not supported.
11 * (do we need to support it if we're coming up in 640x480?)
12 *
13 * FIXME: (things broken by the "new improved" FBCON API)
14 * - Blanking 8bpp displays with VIDC
15 */
16
17#include <linux/module.h>
18#include <linux/kernel.h>
19#include <linux/errno.h>
20#include <linux/string.h>
21#include <linux/ctype.h>
22#include <linux/mm.h>
23#include <linux/init.h>
24#include <linux/fb.h>
25#include <linux/platform_device.h>
26#include <linux/dma-mapping.h>
27#include <linux/io.h>
28#include <linux/gfp.h>
29
30#include <mach/hardware.h>
31#include <asm/irq.h>
32#include <asm/mach-types.h>
33
34#include "acornfb.h"
35
36/*
37 * Default resolution.
38 * NOTE that it has to be supported in the table towards
39 * the end of this file.
40 */
41#define DEFAULT_XRES 640
42#define DEFAULT_YRES 480
43#define DEFAULT_BPP 4
44
45/*
46 * define this to debug the video mode selection
47 */
48#undef DEBUG_MODE_SELECTION
49
50/*
51 * Translation from RISC OS monitor types to actual
52 * HSYNC and VSYNC frequency ranges. These are
53 * probably not right, but they're the best info I
54 * have. Allow 1% either way on the nominal for TVs.
55 */
56#define NR_MONTYPES 6
57static struct fb_monspecs monspecs[NR_MONTYPES] = {
58 { /* TV */
59 .hfmin = 15469,
60 .hfmax = 15781,
61 .vfmin = 49,
62 .vfmax = 51,
63 }, { /* Multi Freq */
64 .hfmin = 0,
65 .hfmax = 99999,
66 .vfmin = 0,
67 .vfmax = 199,
68 }, { /* Hi-res mono */
69 .hfmin = 58608,
70 .hfmax = 58608,
71 .vfmin = 64,
72 .vfmax = 64,
73 }, { /* VGA */
74 .hfmin = 30000,
75 .hfmax = 70000,
76 .vfmin = 60,
77 .vfmax = 60,
78 }, { /* SVGA */
79 .hfmin = 30000,
80 .hfmax = 70000,
81 .vfmin = 56,
82 .vfmax = 75,
83 }, {
84 .hfmin = 30000,
85 .hfmax = 70000,
86 .vfmin = 60,
87 .vfmax = 60,
88 }
89};
90
91static struct fb_info fb_info;
92static struct acornfb_par current_par;
93static struct vidc_timing current_vidc;
94
95extern unsigned int vram_size; /* set by setup.c */
96
97#ifdef HAS_VIDC20
98#include <mach/acornfb.h>
99
100#define MAX_SIZE (2*1024*1024)
101
102/* VIDC20 has a different set of rules from the VIDC:
103 * hcr : must be multiple of 4
104 * hswr : must be even
105 * hdsr : must be even
106 * hder : must be even
107 * vcr : >= 2, (interlace, must be odd)
108 * vswr : >= 1
109 * vdsr : >= 1
110 * vder : >= vdsr
111 */
112static void acornfb_set_timing(struct fb_info *info)
113{
114 struct fb_var_screeninfo *var = &info->var;
115 struct vidc_timing vidc;
116 u_int vcr, fsize;
117 u_int ext_ctl, dat_ctl;
118 u_int words_per_line;
119
120 memset(&vidc, 0, sizeof(vidc));
121
122 vidc.h_sync_width = var->hsync_len - 8;
123 vidc.h_border_start = vidc.h_sync_width + var->left_margin + 8 - 12;
124 vidc.h_display_start = vidc.h_border_start + 12 - 18;
125 vidc.h_display_end = vidc.h_display_start + var->xres;
126 vidc.h_border_end = vidc.h_display_end + 18 - 12;
127 vidc.h_cycle = vidc.h_border_end + var->right_margin + 12 - 8;
128 vidc.h_interlace = vidc.h_cycle / 2;
129 vidc.v_sync_width = var->vsync_len - 1;
130 vidc.v_border_start = vidc.v_sync_width + var->upper_margin;
131 vidc.v_display_start = vidc.v_border_start;
132 vidc.v_display_end = vidc.v_display_start + var->yres;
133 vidc.v_border_end = vidc.v_display_end;
134 vidc.control = acornfb_default_control();
135
136 vcr = var->vsync_len + var->upper_margin + var->yres +
137 var->lower_margin;
138
139 if ((var->vmode & FB_VMODE_MASK) == FB_VMODE_INTERLACED) {
140 vidc.v_cycle = (vcr - 3) / 2;
141 vidc.control |= VIDC20_CTRL_INT;
142 } else
143 vidc.v_cycle = vcr - 2;
144
145 switch (var->bits_per_pixel) {
146 case 1: vidc.control |= VIDC20_CTRL_1BPP; break;
147 case 2: vidc.control |= VIDC20_CTRL_2BPP; break;
148 case 4: vidc.control |= VIDC20_CTRL_4BPP; break;
149 default:
150 case 8: vidc.control |= VIDC20_CTRL_8BPP; break;
151 case 16: vidc.control |= VIDC20_CTRL_16BPP; break;
152 case 32: vidc.control |= VIDC20_CTRL_32BPP; break;
153 }
154
155 acornfb_vidc20_find_rates(&vidc, var);
156 fsize = var->vsync_len + var->upper_margin + var->lower_margin - 1;
157
158 if (memcmp(&current_vidc, &vidc, sizeof(vidc))) {
159 current_vidc = vidc;
160
161 vidc_writel(VIDC20_CTRL | vidc.control);
162 vidc_writel(0xd0000000 | vidc.pll_ctl);
163 vidc_writel(0x80000000 | vidc.h_cycle);
164 vidc_writel(0x81000000 | vidc.h_sync_width);
165 vidc_writel(0x82000000 | vidc.h_border_start);
166 vidc_writel(0x83000000 | vidc.h_display_start);
167 vidc_writel(0x84000000 | vidc.h_display_end);
168 vidc_writel(0x85000000 | vidc.h_border_end);
169 vidc_writel(0x86000000);
170 vidc_writel(0x87000000 | vidc.h_interlace);
171 vidc_writel(0x90000000 | vidc.v_cycle);
172 vidc_writel(0x91000000 | vidc.v_sync_width);
173 vidc_writel(0x92000000 | vidc.v_border_start);
174 vidc_writel(0x93000000 | vidc.v_display_start);
175 vidc_writel(0x94000000 | vidc.v_display_end);
176 vidc_writel(0x95000000 | vidc.v_border_end);
177 vidc_writel(0x96000000);
178 vidc_writel(0x97000000);
179 }
180
181 iomd_writel(fsize, IOMD_FSIZE);
182
183 ext_ctl = acornfb_default_econtrol();
184
185 if (var->sync & FB_SYNC_COMP_HIGH_ACT) /* should be FB_SYNC_COMP */
186 ext_ctl |= VIDC20_ECTL_HS_NCSYNC | VIDC20_ECTL_VS_NCSYNC;
187 else {
188 if (var->sync & FB_SYNC_HOR_HIGH_ACT)
189 ext_ctl |= VIDC20_ECTL_HS_HSYNC;
190 else
191 ext_ctl |= VIDC20_ECTL_HS_NHSYNC;
192
193 if (var->sync & FB_SYNC_VERT_HIGH_ACT)
194 ext_ctl |= VIDC20_ECTL_VS_VSYNC;
195 else
196 ext_ctl |= VIDC20_ECTL_VS_NVSYNC;
197 }
198
199 vidc_writel(VIDC20_ECTL | ext_ctl);
200
201 words_per_line = var->xres * var->bits_per_pixel / 32;
202
203 if (current_par.using_vram && info->fix.smem_len == 2048*1024)
204 words_per_line /= 2;
205
206 /* RiscPC doesn't use the VIDC's VRAM control. */
207 dat_ctl = VIDC20_DCTL_VRAM_DIS | VIDC20_DCTL_SNA | words_per_line;
208
209 /* The data bus width is dependent on both the type
210 * and amount of video memory.
211 * DRAM 32bit low
212 * 1MB VRAM 32bit
213 * 2MB VRAM 64bit
214 */
215 if (current_par.using_vram && current_par.vram_half_sam == 2048)
216 dat_ctl |= VIDC20_DCTL_BUS_D63_0;
217 else
218 dat_ctl |= VIDC20_DCTL_BUS_D31_0;
219
220 vidc_writel(VIDC20_DCTL | dat_ctl);
221
222#ifdef DEBUG_MODE_SELECTION
223 printk(KERN_DEBUG "VIDC registers for %dx%dx%d:\n", var->xres,
224 var->yres, var->bits_per_pixel);
225 printk(KERN_DEBUG " H-cycle : %d\n", vidc.h_cycle);
226 printk(KERN_DEBUG " H-sync-width : %d\n", vidc.h_sync_width);
227 printk(KERN_DEBUG " H-border-start : %d\n", vidc.h_border_start);
228 printk(KERN_DEBUG " H-display-start : %d\n", vidc.h_display_start);
229 printk(KERN_DEBUG " H-display-end : %d\n", vidc.h_display_end);
230 printk(KERN_DEBUG " H-border-end : %d\n", vidc.h_border_end);
231 printk(KERN_DEBUG " H-interlace : %d\n", vidc.h_interlace);
232 printk(KERN_DEBUG " V-cycle : %d\n", vidc.v_cycle);
233 printk(KERN_DEBUG " V-sync-width : %d\n", vidc.v_sync_width);
234 printk(KERN_DEBUG " V-border-start : %d\n", vidc.v_border_start);
235 printk(KERN_DEBUG " V-display-start : %d\n", vidc.v_display_start);
236 printk(KERN_DEBUG " V-display-end : %d\n", vidc.v_display_end);
237 printk(KERN_DEBUG " V-border-end : %d\n", vidc.v_border_end);
238 printk(KERN_DEBUG " Ext Ctrl (C) : 0x%08X\n", ext_ctl);
239 printk(KERN_DEBUG " PLL Ctrl (D) : 0x%08X\n", vidc.pll_ctl);
240 printk(KERN_DEBUG " Ctrl (E) : 0x%08X\n", vidc.control);
241 printk(KERN_DEBUG " Data Ctrl (F) : 0x%08X\n", dat_ctl);
242 printk(KERN_DEBUG " Fsize : 0x%08X\n", fsize);
243#endif
244}
245
246/*
247 * We have to take note of the VIDC20's 16-bit palette here.
248 * The VIDC20 looks up a 16 bit pixel as follows:
249 *
250 * bits 111111
251 * 5432109876543210
252 * red ++++++++ (8 bits, 7 to 0)
253 * green ++++++++ (8 bits, 11 to 4)
254 * blue ++++++++ (8 bits, 15 to 8)
255 *
256 * We use a pixel which looks like:
257 *
258 * bits 111111
259 * 5432109876543210
260 * red +++++ (5 bits, 4 to 0)
261 * green +++++ (5 bits, 9 to 5)
262 * blue +++++ (5 bits, 14 to 10)
263 */
264static int
265acornfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
266 u_int trans, struct fb_info *info)
267{
268 union palette pal;
269
270 if (regno >= current_par.palette_size)
271 return 1;
272
273 if (regno < 16 && info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
274 u32 pseudo_val;
275
276 pseudo_val = regno << info->var.red.offset;
277 pseudo_val |= regno << info->var.green.offset;
278 pseudo_val |= regno << info->var.blue.offset;
279
280 ((u32 *)info->pseudo_palette)[regno] = pseudo_val;
281 }
282
283 pal.p = 0;
284 pal.vidc20.red = red >> 8;
285 pal.vidc20.green = green >> 8;
286 pal.vidc20.blue = blue >> 8;
287
288 current_par.palette[regno] = pal;
289
290 if (info->var.bits_per_pixel == 16) {
291 int i;
292
293 pal.p = 0;
294 vidc_writel(0x10000000);
295 for (i = 0; i < 256; i += 1) {
296 pal.vidc20.red = current_par.palette[i & 31].vidc20.red;
297 pal.vidc20.green = current_par.palette[(i >> 1) & 31].vidc20.green;
298 pal.vidc20.blue = current_par.palette[(i >> 2) & 31].vidc20.blue;
299 vidc_writel(pal.p);
300 /* Palette register pointer auto-increments */
301 }
302 } else {
303 vidc_writel(0x10000000 | regno);
304 vidc_writel(pal.p);
305 }
306
307 return 0;
308}
309#endif
310
311/*
312 * Before selecting the timing parameters, adjust
313 * the resolution to fit the rules.
314 */
315static int
316acornfb_adjust_timing(struct fb_info *info, struct fb_var_screeninfo *var, u_int fontht)
317{
318 u_int font_line_len, sam_size, min_size, size, nr_y;
319
320 /* xres must be even */
321 var->xres = (var->xres + 1) & ~1;
322
323 /*
324 * We don't allow xres_virtual to differ from xres
325 */
326 var->xres_virtual = var->xres;
327 var->xoffset = 0;
328
329 if (current_par.using_vram)
330 sam_size = current_par.vram_half_sam * 2;
331 else
332 sam_size = 16;
333
334 /*
335 * Now, find a value for yres_virtual which allows
336 * us to do ywrap scrolling. The value of
337 * yres_virtual must be such that the end of the
338 * displayable frame buffer must be aligned with
339 * the start of a font line.
340 */
341 font_line_len = var->xres * var->bits_per_pixel * fontht / 8;
342 min_size = var->xres * var->yres * var->bits_per_pixel / 8;
343
344 /*
345 * If minimum screen size is greater than that we have
346 * available, reject it.
347 */
348 if (min_size > info->fix.smem_len)
349 return -EINVAL;
350
351 /* Find int 'y', such that y * fll == s * sam < maxsize
352 * y = s * sam / fll; s = maxsize / sam
353 */
354 for (size = info->fix.smem_len;
355 nr_y = size / font_line_len, min_size <= size;
356 size -= sam_size) {
357 if (nr_y * font_line_len == size)
358 break;
359 }
360 nr_y *= fontht;
361
362 if (var->accel_flags & FB_ACCELF_TEXT) {
363 if (min_size > size) {
364 /*
365 * failed, use ypan
366 */
367 size = info->fix.smem_len;
368 var->yres_virtual = size / (font_line_len / fontht);
369 } else
370 var->yres_virtual = nr_y;
371 } else if (var->yres_virtual > nr_y)
372 var->yres_virtual = nr_y;
373
374 current_par.screen_end = info->fix.smem_start + size;
375
376 /*
377 * Fix yres & yoffset if needed.
378 */
379 if (var->yres > var->yres_virtual)
380 var->yres = var->yres_virtual;
381
382 if (var->vmode & FB_VMODE_YWRAP) {
383 if (var->yoffset > var->yres_virtual)
384 var->yoffset = var->yres_virtual;
385 } else {
386 if (var->yoffset + var->yres > var->yres_virtual)
387 var->yoffset = var->yres_virtual - var->yres;
388 }
389
390 /* hsync_len must be even */
391 var->hsync_len = (var->hsync_len + 1) & ~1;
392
393#if defined(HAS_VIDC20)
394 /* left_margin must be even */
395 if (var->left_margin & 1) {
396 var->left_margin += 1;
397 var->right_margin -= 1;
398 }
399
400 /* right_margin must be even */
401 if (var->right_margin & 1)
402 var->right_margin += 1;
403#endif
404
405 if (var->vsync_len < 1)
406 var->vsync_len = 1;
407
408 return 0;
409}
410
411static int
412acornfb_validate_timing(struct fb_var_screeninfo *var,
413 struct fb_monspecs *monspecs)
414{
415 unsigned long hs, vs;
416
417 /*
418 * hs(Hz) = 10^12 / (pixclock * xtotal)
419 * vs(Hz) = hs(Hz) / ytotal
420 *
421 * No need to do long long divisions or anything
422 * like that if you factor it correctly
423 */
424 hs = 1953125000 / var->pixclock;
425 hs = hs * 512 /
426 (var->xres + var->left_margin + var->right_margin + var->hsync_len);
427 vs = hs /
428 (var->yres + var->upper_margin + var->lower_margin + var->vsync_len);
429
430 return (vs >= monspecs->vfmin && vs <= monspecs->vfmax &&
431 hs >= monspecs->hfmin && hs <= monspecs->hfmax) ? 0 : -EINVAL;
432}
433
434static inline void
435acornfb_update_dma(struct fb_info *info, struct fb_var_screeninfo *var)
436{
437 u_int off = var->yoffset * info->fix.line_length;
438
439#if defined(HAS_MEMC)
440 memc_write(VDMA_INIT, off >> 2);
441#elif defined(HAS_IOMD)
442 iomd_writel(info->fix.smem_start + off, IOMD_VIDINIT);
443#endif
444}
445
446static int
447acornfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
448{
449 u_int fontht;
450 int err;
451
452 /*
453 * FIXME: Find the font height
454 */
455 fontht = 8;
456
457 var->red.msb_right = 0;
458 var->green.msb_right = 0;
459 var->blue.msb_right = 0;
460 var->transp.msb_right = 0;
461
462 switch (var->bits_per_pixel) {
463 case 1: case 2: case 4: case 8:
464 var->red.offset = 0;
465 var->red.length = var->bits_per_pixel;
466 var->green = var->red;
467 var->blue = var->red;
468 var->transp.offset = 0;
469 var->transp.length = 0;
470 break;
471
472#ifdef HAS_VIDC20
473 case 16:
474 var->red.offset = 0;
475 var->red.length = 5;
476 var->green.offset = 5;
477 var->green.length = 5;
478 var->blue.offset = 10;
479 var->blue.length = 5;
480 var->transp.offset = 15;
481 var->transp.length = 1;
482 break;
483
484 case 32:
485 var->red.offset = 0;
486 var->red.length = 8;
487 var->green.offset = 8;
488 var->green.length = 8;
489 var->blue.offset = 16;
490 var->blue.length = 8;
491 var->transp.offset = 24;
492 var->transp.length = 4;
493 break;
494#endif
495 default:
496 return -EINVAL;
497 }
498
499 /*
500 * Check to see if the pixel rate is valid.
501 */
502 if (!acornfb_valid_pixrate(var))
503 return -EINVAL;
504
505 /*
506 * Validate and adjust the resolution to
507 * match the video generator hardware.
508 */
509 err = acornfb_adjust_timing(info, var, fontht);
510 if (err)
511 return err;
512
513 /*
514 * Validate the timing against the
515 * monitor hardware.
516 */
517 return acornfb_validate_timing(var, &info->monspecs);
518}
519
520static int acornfb_set_par(struct fb_info *info)
521{
522 switch (info->var.bits_per_pixel) {
523 case 1:
524 current_par.palette_size = 2;
525 info->fix.visual = FB_VISUAL_MONO10;
526 break;
527 case 2:
528 current_par.palette_size = 4;
529 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
530 break;
531 case 4:
532 current_par.palette_size = 16;
533 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
534 break;
535 case 8:
536 current_par.palette_size = VIDC_PALETTE_SIZE;
537 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
538 break;
539#ifdef HAS_VIDC20
540 case 16:
541 current_par.palette_size = 32;
542 info->fix.visual = FB_VISUAL_DIRECTCOLOR;
543 break;
544 case 32:
545 current_par.palette_size = VIDC_PALETTE_SIZE;
546 info->fix.visual = FB_VISUAL_DIRECTCOLOR;
547 break;
548#endif
549 default:
550 BUG();
551 }
552
553 info->fix.line_length = (info->var.xres * info->var.bits_per_pixel) / 8;
554
555#if defined(HAS_MEMC)
556 {
557 unsigned long size = info->fix.smem_len - VDMA_XFERSIZE;
558
559 memc_write(VDMA_START, 0);
560 memc_write(VDMA_END, size >> 2);
561 }
562#elif defined(HAS_IOMD)
563 {
564 unsigned long start, size;
565 u_int control;
566
567 start = info->fix.smem_start;
568 size = current_par.screen_end;
569
570 if (current_par.using_vram) {
571 size -= current_par.vram_half_sam;
572 control = DMA_CR_E | (current_par.vram_half_sam / 256);
573 } else {
574 size -= 16;
575 control = DMA_CR_E | DMA_CR_D | 16;
576 }
577
578 iomd_writel(start, IOMD_VIDSTART);
579 iomd_writel(size, IOMD_VIDEND);
580 iomd_writel(control, IOMD_VIDCR);
581 }
582#endif
583
584 acornfb_update_dma(info, &info->var);
585 acornfb_set_timing(info);
586
587 return 0;
588}
589
590static int
591acornfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
592{
593 u_int y_bottom = var->yoffset;
594
595 if (!(var->vmode & FB_VMODE_YWRAP))
596 y_bottom += info->var.yres;
597
598 if (y_bottom > info->var.yres_virtual)
599 return -EINVAL;
600
601 acornfb_update_dma(info, var);
602
603 return 0;
604}
605
606static const struct fb_ops acornfb_ops = {
607 .owner = THIS_MODULE,
608 FB_DEFAULT_IOMEM_OPS,
609 .fb_check_var = acornfb_check_var,
610 .fb_set_par = acornfb_set_par,
611 .fb_setcolreg = acornfb_setcolreg,
612 .fb_pan_display = acornfb_pan_display,
613};
614
615/*
616 * Everything after here is initialisation!!!
617 */
618static struct fb_videomode modedb[] = {
619 { /* 320x256 @ 50Hz */
620 NULL, 50, 320, 256, 125000, 92, 62, 35, 19, 38, 2,
621 FB_SYNC_COMP_HIGH_ACT,
622 FB_VMODE_NONINTERLACED
623 }, { /* 640x250 @ 50Hz, 15.6 kHz hsync */
624 NULL, 50, 640, 250, 62500, 185, 123, 38, 21, 76, 3,
625 0,
626 FB_VMODE_NONINTERLACED
627 }, { /* 640x256 @ 50Hz, 15.6 kHz hsync */
628 NULL, 50, 640, 256, 62500, 185, 123, 35, 18, 76, 3,
629 0,
630 FB_VMODE_NONINTERLACED
631 }, { /* 640x512 @ 50Hz, 26.8 kHz hsync */
632 NULL, 50, 640, 512, 41667, 113, 87, 18, 1, 56, 3,
633 0,
634 FB_VMODE_NONINTERLACED
635 }, { /* 640x250 @ 70Hz, 31.5 kHz hsync */
636 NULL, 70, 640, 250, 39722, 48, 16, 109, 88, 96, 2,
637 0,
638 FB_VMODE_NONINTERLACED
639 }, { /* 640x256 @ 70Hz, 31.5 kHz hsync */
640 NULL, 70, 640, 256, 39722, 48, 16, 106, 85, 96, 2,
641 0,
642 FB_VMODE_NONINTERLACED
643 }, { /* 640x352 @ 70Hz, 31.5 kHz hsync */
644 NULL, 70, 640, 352, 39722, 48, 16, 58, 37, 96, 2,
645 0,
646 FB_VMODE_NONINTERLACED
647 }, { /* 640x480 @ 60Hz, 31.5 kHz hsync */
648 NULL, 60, 640, 480, 39722, 48, 16, 32, 11, 96, 2,
649 0,
650 FB_VMODE_NONINTERLACED
651 }, { /* 800x600 @ 56Hz, 35.2 kHz hsync */
652 NULL, 56, 800, 600, 27778, 101, 23, 22, 1, 100, 2,
653 0,
654 FB_VMODE_NONINTERLACED
655 }, { /* 896x352 @ 60Hz, 21.8 kHz hsync */
656 NULL, 60, 896, 352, 41667, 59, 27, 9, 0, 118, 3,
657 0,
658 FB_VMODE_NONINTERLACED
659 }, { /* 1024x 768 @ 60Hz, 48.4 kHz hsync */
660 NULL, 60, 1024, 768, 15385, 160, 24, 29, 3, 136, 6,
661 0,
662 FB_VMODE_NONINTERLACED
663 }, { /* 1280x1024 @ 60Hz, 63.8 kHz hsync */
664 NULL, 60, 1280, 1024, 9090, 186, 96, 38, 1, 160, 3,
665 0,
666 FB_VMODE_NONINTERLACED
667 }
668};
669
670static struct fb_videomode acornfb_default_mode = {
671 .name = NULL,
672 .refresh = 60,
673 .xres = 640,
674 .yres = 480,
675 .pixclock = 39722,
676 .left_margin = 56,
677 .right_margin = 16,
678 .upper_margin = 34,
679 .lower_margin = 9,
680 .hsync_len = 88,
681 .vsync_len = 2,
682 .sync = 0,
683 .vmode = FB_VMODE_NONINTERLACED
684};
685
686static void acornfb_init_fbinfo(void)
687{
688 static int first = 1;
689
690 if (!first)
691 return;
692 first = 0;
693
694 fb_info.fbops = &acornfb_ops;
695 fb_info.flags = FBINFO_HWACCEL_YPAN;
696 fb_info.pseudo_palette = current_par.pseudo_palette;
697
698 strcpy(fb_info.fix.id, "Acorn");
699 fb_info.fix.type = FB_TYPE_PACKED_PIXELS;
700 fb_info.fix.type_aux = 0;
701 fb_info.fix.xpanstep = 0;
702 fb_info.fix.ypanstep = 1;
703 fb_info.fix.ywrapstep = 1;
704 fb_info.fix.line_length = 0;
705 fb_info.fix.accel = FB_ACCEL_NONE;
706
707 /*
708 * setup initial parameters
709 */
710 memset(&fb_info.var, 0, sizeof(fb_info.var));
711
712#if defined(HAS_VIDC20)
713 fb_info.var.red.length = 8;
714 fb_info.var.transp.length = 4;
715#endif
716 fb_info.var.green = fb_info.var.red;
717 fb_info.var.blue = fb_info.var.red;
718 fb_info.var.nonstd = 0;
719 fb_info.var.activate = FB_ACTIVATE_NOW;
720 fb_info.var.height = -1;
721 fb_info.var.width = -1;
722 fb_info.var.vmode = FB_VMODE_NONINTERLACED;
723 fb_info.var.accel_flags = FB_ACCELF_TEXT;
724
725 current_par.dram_size = 0;
726 current_par.montype = -1;
727 current_par.dpms = 0;
728}
729
730/*
731 * setup acornfb options:
732 *
733 * mon:hmin-hmax:vmin-vmax:dpms:width:height
734 * Set monitor parameters:
735 * hmin = horizontal minimum frequency (Hz)
736 * hmax = horizontal maximum frequency (Hz) (optional)
737 * vmin = vertical minimum frequency (Hz)
738 * vmax = vertical maximum frequency (Hz) (optional)
739 * dpms = DPMS supported? (optional)
740 * width = width of picture in mm. (optional)
741 * height = height of picture in mm. (optional)
742 *
743 * montype:type
744 * Set RISC-OS style monitor type:
745 * 0 (or tv) - TV frequency
746 * 1 (or multi) - Multi frequency
747 * 2 (or hires) - Hi-res monochrome
748 * 3 (or vga) - VGA
749 * 4 (or svga) - SVGA
750 * auto, or option missing
751 * - try hardware detect
752 *
753 * dram:size
754 * Set the amount of DRAM to use for the frame buffer
755 * (even if you have VRAM).
756 * size can optionally be followed by 'M' or 'K' for
757 * MB or KB respectively.
758 */
759static void acornfb_parse_mon(char *opt)
760{
761 char *p = opt;
762
763 current_par.montype = -2;
764
765 fb_info.monspecs.hfmin = simple_strtoul(p, &p, 0);
766 if (*p == '-')
767 fb_info.monspecs.hfmax = simple_strtoul(p + 1, &p, 0);
768 else
769 fb_info.monspecs.hfmax = fb_info.monspecs.hfmin;
770
771 if (*p != ':')
772 goto bad;
773
774 fb_info.monspecs.vfmin = simple_strtoul(p + 1, &p, 0);
775 if (*p == '-')
776 fb_info.monspecs.vfmax = simple_strtoul(p + 1, &p, 0);
777 else
778 fb_info.monspecs.vfmax = fb_info.monspecs.vfmin;
779
780 if (*p != ':')
781 goto check_values;
782
783 fb_info.monspecs.dpms = simple_strtoul(p + 1, &p, 0);
784
785 if (*p != ':')
786 goto check_values;
787
788 fb_info.var.width = simple_strtoul(p + 1, &p, 0);
789
790 if (*p != ':')
791 goto check_values;
792
793 fb_info.var.height = simple_strtoul(p + 1, NULL, 0);
794
795check_values:
796 if (fb_info.monspecs.hfmax < fb_info.monspecs.hfmin ||
797 fb_info.monspecs.vfmax < fb_info.monspecs.vfmin)
798 goto bad;
799 return;
800
801bad:
802 printk(KERN_ERR "Acornfb: bad monitor settings: %s\n", opt);
803 current_par.montype = -1;
804}
805
806static void acornfb_parse_montype(char *opt)
807{
808 current_par.montype = -2;
809
810 if (strncmp(opt, "tv", 2) == 0) {
811 opt += 2;
812 current_par.montype = 0;
813 } else if (strncmp(opt, "multi", 5) == 0) {
814 opt += 5;
815 current_par.montype = 1;
816 } else if (strncmp(opt, "hires", 5) == 0) {
817 opt += 5;
818 current_par.montype = 2;
819 } else if (strncmp(opt, "vga", 3) == 0) {
820 opt += 3;
821 current_par.montype = 3;
822 } else if (strncmp(opt, "svga", 4) == 0) {
823 opt += 4;
824 current_par.montype = 4;
825 } else if (strncmp(opt, "auto", 4) == 0) {
826 opt += 4;
827 current_par.montype = -1;
828 } else if (isdigit(*opt))
829 current_par.montype = simple_strtoul(opt, &opt, 0);
830
831 if (current_par.montype == -2 ||
832 current_par.montype > NR_MONTYPES) {
833 printk(KERN_ERR "acornfb: unknown monitor type: %s\n",
834 opt);
835 current_par.montype = -1;
836 } else
837 if (opt && *opt) {
838 if (strcmp(opt, ",dpms") == 0)
839 current_par.dpms = 1;
840 else
841 printk(KERN_ERR
842 "acornfb: unknown monitor option: %s\n",
843 opt);
844 }
845}
846
847static void acornfb_parse_dram(char *opt)
848{
849 unsigned int size;
850
851 size = simple_strtoul(opt, &opt, 0);
852
853 if (opt) {
854 switch (*opt) {
855 case 'M':
856 case 'm':
857 size *= 1024;
858 fallthrough;
859 case 'K':
860 case 'k':
861 size *= 1024;
862 default:
863 break;
864 }
865 }
866
867 current_par.dram_size = size;
868}
869
870static struct options {
871 char *name;
872 void (*parse)(char *opt);
873} opt_table[] = {
874 { "mon", acornfb_parse_mon },
875 { "montype", acornfb_parse_montype },
876 { "dram", acornfb_parse_dram },
877 { NULL, NULL }
878};
879
880static int acornfb_setup(char *options)
881{
882 struct options *optp;
883 char *opt;
884
885 if (!options || !*options)
886 return 0;
887
888 acornfb_init_fbinfo();
889
890 while ((opt = strsep(&options, ",")) != NULL) {
891 if (!*opt)
892 continue;
893
894 for (optp = opt_table; optp->name; optp++) {
895 int optlen;
896
897 optlen = strlen(optp->name);
898
899 if (strncmp(opt, optp->name, optlen) == 0 &&
900 opt[optlen] == ':') {
901 optp->parse(opt + optlen + 1);
902 break;
903 }
904 }
905
906 if (!optp->name)
907 printk(KERN_ERR "acornfb: unknown parameter: %s\n",
908 opt);
909 }
910 return 0;
911}
912
913/*
914 * Detect type of monitor connected
915 * For now, we just assume SVGA
916 */
917static int acornfb_detect_monitortype(void)
918{
919 return 4;
920}
921
922static int acornfb_probe(struct platform_device *dev)
923{
924 unsigned long size;
925 u_int h_sync, v_sync;
926 int rc, i;
927 char *option = NULL;
928
929 if (fb_get_options("acornfb", &option))
930 return -ENODEV;
931 acornfb_setup(option);
932
933 acornfb_init_fbinfo();
934
935 current_par.dev = &dev->dev;
936
937 if (current_par.montype == -1)
938 current_par.montype = acornfb_detect_monitortype();
939
940 if (current_par.montype == -1 || current_par.montype > NR_MONTYPES)
941 current_par.montype = 4;
942
943 if (current_par.montype >= 0) {
944 fb_info.monspecs = monspecs[current_par.montype];
945 fb_info.monspecs.dpms = current_par.dpms;
946 }
947
948 /*
949 * Try to select a suitable default mode
950 */
951 for (i = 0; i < ARRAY_SIZE(modedb); i++) {
952 unsigned long hs;
953
954 hs = modedb[i].refresh *
955 (modedb[i].yres + modedb[i].upper_margin +
956 modedb[i].lower_margin + modedb[i].vsync_len);
957 if (modedb[i].xres == DEFAULT_XRES &&
958 modedb[i].yres == DEFAULT_YRES &&
959 modedb[i].refresh >= fb_info.monspecs.vfmin &&
960 modedb[i].refresh <= fb_info.monspecs.vfmax &&
961 hs >= fb_info.monspecs.hfmin &&
962 hs <= fb_info.monspecs.hfmax) {
963 acornfb_default_mode = modedb[i];
964 break;
965 }
966 }
967
968 fb_info.screen_base = (char *)SCREEN_BASE;
969 fb_info.fix.smem_start = SCREEN_START;
970 current_par.using_vram = 0;
971
972 /*
973 * If vram_size is set, we are using VRAM in
974 * a Risc PC. However, if the user has specified
975 * an amount of DRAM then use that instead.
976 */
977 if (vram_size && !current_par.dram_size) {
978 size = vram_size;
979 current_par.vram_half_sam = vram_size / 1024;
980 current_par.using_vram = 1;
981 } else if (current_par.dram_size)
982 size = current_par.dram_size;
983 else
984 size = MAX_SIZE;
985
986 /*
987 * Limit maximum screen size.
988 */
989 if (size > MAX_SIZE)
990 size = MAX_SIZE;
991
992 size = PAGE_ALIGN(size);
993
994#if defined(HAS_VIDC20)
995 if (!current_par.using_vram) {
996 dma_addr_t handle;
997 void *base;
998
999 /*
1000 * RiscPC needs to allocate the DRAM memory
1001 * for the framebuffer if we are not using
1002 * VRAM.
1003 */
1004 base = dma_alloc_wc(current_par.dev, size, &handle,
1005 GFP_KERNEL);
1006 if (base == NULL) {
1007 printk(KERN_ERR "acornfb: unable to allocate screen memory\n");
1008 return -ENOMEM;
1009 }
1010
1011 fb_info.screen_base = base;
1012 fb_info.fix.smem_start = handle;
1013 }
1014#endif
1015 fb_info.fix.smem_len = size;
1016 current_par.palette_size = VIDC_PALETTE_SIZE;
1017
1018 /*
1019 * Lookup the timing for this resolution. If we can't
1020 * find it, then we can't restore it if we change
1021 * the resolution, so we disable this feature.
1022 */
1023 do {
1024 rc = fb_find_mode(&fb_info.var, &fb_info, NULL, modedb,
1025 ARRAY_SIZE(modedb),
1026 &acornfb_default_mode, DEFAULT_BPP);
1027 /*
1028 * If we found an exact match, all ok.
1029 */
1030 if (rc == 1)
1031 break;
1032
1033 rc = fb_find_mode(&fb_info.var, &fb_info, NULL, NULL, 0,
1034 &acornfb_default_mode, DEFAULT_BPP);
1035 /*
1036 * If we found an exact match, all ok.
1037 */
1038 if (rc == 1)
1039 break;
1040
1041 rc = fb_find_mode(&fb_info.var, &fb_info, NULL, modedb,
1042 ARRAY_SIZE(modedb),
1043 &acornfb_default_mode, DEFAULT_BPP);
1044 if (rc)
1045 break;
1046
1047 rc = fb_find_mode(&fb_info.var, &fb_info, NULL, NULL, 0,
1048 &acornfb_default_mode, DEFAULT_BPP);
1049 } while (0);
1050
1051 /*
1052 * If we didn't find an exact match, try the
1053 * generic database.
1054 */
1055 if (rc == 0) {
1056 printk("Acornfb: no valid mode found\n");
1057 return -EINVAL;
1058 }
1059
1060 h_sync = 1953125000 / fb_info.var.pixclock;
1061 h_sync = h_sync * 512 / (fb_info.var.xres + fb_info.var.left_margin +
1062 fb_info.var.right_margin + fb_info.var.hsync_len);
1063 v_sync = h_sync / (fb_info.var.yres + fb_info.var.upper_margin +
1064 fb_info.var.lower_margin + fb_info.var.vsync_len);
1065
1066 printk(KERN_INFO "Acornfb: %dkB %cRAM, %s, using %dx%d, %d.%03dkHz, %dHz\n",
1067 fb_info.fix.smem_len / 1024,
1068 current_par.using_vram ? 'V' : 'D',
1069 VIDC_NAME, fb_info.var.xres, fb_info.var.yres,
1070 h_sync / 1000, h_sync % 1000, v_sync);
1071
1072 printk(KERN_INFO "Acornfb: Monitor: %d.%03d-%d.%03dkHz, %d-%dHz%s\n",
1073 fb_info.monspecs.hfmin / 1000, fb_info.monspecs.hfmin % 1000,
1074 fb_info.monspecs.hfmax / 1000, fb_info.monspecs.hfmax % 1000,
1075 fb_info.monspecs.vfmin, fb_info.monspecs.vfmax,
1076 fb_info.monspecs.dpms ? ", DPMS" : "");
1077
1078 if (fb_set_var(&fb_info, &fb_info.var))
1079 printk(KERN_ERR "Acornfb: unable to set display parameters\n");
1080
1081 if (register_framebuffer(&fb_info) < 0)
1082 return -EINVAL;
1083 return 0;
1084}
1085
1086static struct platform_driver acornfb_driver = {
1087 .probe = acornfb_probe,
1088 .driver = {
1089 .name = "acornfb",
1090 },
1091};
1092
1093static int __init acornfb_init(void)
1094{
1095 return platform_driver_register(&acornfb_driver);
1096}
1097
1098module_init(acornfb_init);
1099
1100MODULE_AUTHOR("Russell King");
1101MODULE_DESCRIPTION("VIDC 1/1a/20 framebuffer driver");
1102MODULE_LICENSE("GPL");