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V4L/DVB (11619): cx18: Simplify the work handler for outgoing mailbox commands
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / video / acornfb.c
blob6995fe1e86d4aae1ad5abd6535e65572f1a59316
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/slab.h>
26 #include <linux/mm.h>
27 #include <linux/init.h>
28 #include <linux/fb.h>
29 #include <linux/platform_device.h>
30 #include <linux/dma-mapping.h>
31 #include <linux/io.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 * VIDC machines can't do 16 or 32BPP modes.
42 */
43 #ifdef HAS_VIDC
44 #undef FBCON_HAS_CFB16
45 #undef FBCON_HAS_CFB32
46 #endif
47
48 /*
49 * Default resolution.
50 * NOTE that it has to be supported in the table towards
51 * the end of this file.
52 */
53 #define DEFAULT_XRES 640
54 #define DEFAULT_YRES 480
55 #define DEFAULT_BPP 4
56
57 /*
58 * define this to debug the video mode selection
59 */
60 #undef DEBUG_MODE_SELECTION
61
62 /*
63 * Translation from RISC OS monitor types to actual
64 * HSYNC and VSYNC frequency ranges. These are
65 * probably not right, but they're the best info I
66 * have. Allow 1% either way on the nominal for TVs.
67 */
68 #define NR_MONTYPES 6
69 static struct fb_monspecs monspecs[NR_MONTYPES] __initdata = {
70 { /* TV */
71 .hfmin = 15469,
72 .hfmax = 15781,
73 .vfmin = 49,
74 .vfmax = 51,
75 }, { /* Multi Freq */
76 .hfmin = 0,
77 .hfmax = 99999,
78 .vfmin = 0,
79 .vfmax = 199,
80 }, { /* Hi-res mono */
81 .hfmin = 58608,
82 .hfmax = 58608,
83 .vfmin = 64,
84 .vfmax = 64,
85 }, { /* VGA */
86 .hfmin = 30000,
87 .hfmax = 70000,
88 .vfmin = 60,
89 .vfmax = 60,
90 }, { /* SVGA */
91 .hfmin = 30000,
92 .hfmax = 70000,
93 .vfmin = 56,
94 .vfmax = 75,
95 }, {
96 .hfmin = 30000,
97 .hfmax = 70000,
98 .vfmin = 60,
99 .vfmax = 60,
100 }
101 };
102
103 static struct fb_info fb_info;
104 static struct acornfb_par current_par;
105 static struct vidc_timing current_vidc;
106
107 extern unsigned int vram_size; /* set by setup.c */
108
109 #ifdef HAS_VIDC
110
111 #define MAX_SIZE 480*1024
112
113 /* CTL VIDC Actual
114 * 24.000 0 8.000
115 * 25.175 0 8.392
116 * 36.000 0 12.000
117 * 24.000 1 12.000
118 * 25.175 1 12.588
119 * 24.000 2 16.000
120 * 25.175 2 16.783
121 * 36.000 1 18.000
122 * 24.000 3 24.000
123 * 36.000 2 24.000
124 * 25.175 3 25.175
125 * 36.000 3 36.000
126 */
127 struct pixclock {
128 u_long min_clock;
129 u_long max_clock;
130 u_int vidc_ctl;
131 u_int vid_ctl;
132 };
133
134 static struct pixclock arc_clocks[] = {
135 /* we allow +/-1% on these */
136 { 123750, 126250, VIDC_CTRL_DIV3, VID_CTL_24MHz }, /* 8.000MHz */
137 { 82500, 84167, VIDC_CTRL_DIV2, VID_CTL_24MHz }, /* 12.000MHz */
138 { 61875, 63125, VIDC_CTRL_DIV1_5, VID_CTL_24MHz }, /* 16.000MHz */
139 { 41250, 42083, VIDC_CTRL_DIV1, VID_CTL_24MHz }, /* 24.000MHz */
140 };
141
142 static struct pixclock *
143 acornfb_valid_pixrate(struct fb_var_screeninfo *var)
144 {
145 u_long pixclock = var->pixclock;
146 u_int i;
147
148 if (!var->pixclock)
149 return NULL;
150
151 for (i = 0; i < ARRAY_SIZE(arc_clocks); i++)
152 if (pixclock > arc_clocks[i].min_clock &&
153 pixclock < arc_clocks[i].max_clock)
154 return arc_clocks + i;
155
156 return NULL;
157 }
158
159 /* VIDC Rules:
160 * hcr : must be even (interlace, hcr/2 must be even)
161 * hswr : must be even
162 * hdsr : must be odd
163 * hder : must be odd
164 *
165 * vcr : must be odd
166 * vswr : >= 1
167 * vdsr : >= 1
168 * vder : >= vdsr
169 * if interlaced, then hcr/2 must be even
170 */
171 static void
172 acornfb_set_timing(struct fb_var_screeninfo *var)
173 {
174 struct pixclock *pclk;
175 struct vidc_timing vidc;
176 u_int horiz_correction;
177 u_int sync_len, display_start, display_end, cycle;
178 u_int is_interlaced;
179 u_int vid_ctl, vidc_ctl;
180 u_int bandwidth;
181
182 memset(&vidc, 0, sizeof(vidc));
183
184 pclk = acornfb_valid_pixrate(var);
185 vidc_ctl = pclk->vidc_ctl;
186 vid_ctl = pclk->vid_ctl;
187
188 bandwidth = var->pixclock * 8 / var->bits_per_pixel;
189 /* 25.175, 4bpp = 79.444ns per byte, 317.776ns per word: fifo = 2,6 */
190 if (bandwidth > 143500)
191 vidc_ctl |= VIDC_CTRL_FIFO_3_7;
192 else if (bandwidth > 71750)
193 vidc_ctl |= VIDC_CTRL_FIFO_2_6;
194 else if (bandwidth > 35875)
195 vidc_ctl |= VIDC_CTRL_FIFO_1_5;
196 else
197 vidc_ctl |= VIDC_CTRL_FIFO_0_4;
198
199 switch (var->bits_per_pixel) {
200 case 1:
201 horiz_correction = 19;
202 vidc_ctl |= VIDC_CTRL_1BPP;
203 break;
204
205 case 2:
206 horiz_correction = 11;
207 vidc_ctl |= VIDC_CTRL_2BPP;
208 break;
209
210 case 4:
211 horiz_correction = 7;
212 vidc_ctl |= VIDC_CTRL_4BPP;
213 break;
214
215 default:
216 case 8:
217 horiz_correction = 5;
218 vidc_ctl |= VIDC_CTRL_8BPP;
219 break;
220 }
221
222 if (var->sync & FB_SYNC_COMP_HIGH_ACT) /* should be FB_SYNC_COMP */
223 vidc_ctl |= VIDC_CTRL_CSYNC;
224 else {
225 if (!(var->sync & FB_SYNC_HOR_HIGH_ACT))
226 vid_ctl |= VID_CTL_HS_NHSYNC;
227
228 if (!(var->sync & FB_SYNC_VERT_HIGH_ACT))
229 vid_ctl |= VID_CTL_VS_NVSYNC;
230 }
231
232 sync_len = var->hsync_len;
233 display_start = sync_len + var->left_margin;
234 display_end = display_start + var->xres;
235 cycle = display_end + var->right_margin;
236
237 /* if interlaced, then hcr/2 must be even */
238 is_interlaced = (var->vmode & FB_VMODE_MASK) == FB_VMODE_INTERLACED;
239
240 if (is_interlaced) {
241 vidc_ctl |= VIDC_CTRL_INTERLACE;
242 if (cycle & 2) {
243 cycle += 2;
244 var->right_margin += 2;
245 }
246 }
247
248 vidc.h_cycle = (cycle - 2) / 2;
249 vidc.h_sync_width = (sync_len - 2) / 2;
250 vidc.h_border_start = (display_start - 1) / 2;
251 vidc.h_display_start = (display_start - horiz_correction) / 2;
252 vidc.h_display_end = (display_end - horiz_correction) / 2;
253 vidc.h_border_end = (display_end - 1) / 2;
254 vidc.h_interlace = (vidc.h_cycle + 1) / 2;
255
256 sync_len = var->vsync_len;
257 display_start = sync_len + var->upper_margin;
258 display_end = display_start + var->yres;
259 cycle = display_end + var->lower_margin;
260
261 if (is_interlaced)
262 cycle = (cycle - 3) / 2;
263 else
264 cycle = cycle - 1;
265
266 vidc.v_cycle = cycle;
267 vidc.v_sync_width = sync_len - 1;
268 vidc.v_border_start = display_start - 1;
269 vidc.v_display_start = vidc.v_border_start;
270 vidc.v_display_end = display_end - 1;
271 vidc.v_border_end = vidc.v_display_end;
272
273 if (machine_is_a5k())
274 __raw_writeb(vid_ctl, IOEB_VID_CTL);
275
276 if (memcmp(&current_vidc, &vidc, sizeof(vidc))) {
277 current_vidc = vidc;
278
279 vidc_writel(0xe0000000 | vidc_ctl);
280 vidc_writel(0x80000000 | (vidc.h_cycle << 14));
281 vidc_writel(0x84000000 | (vidc.h_sync_width << 14));
282 vidc_writel(0x88000000 | (vidc.h_border_start << 14));
283 vidc_writel(0x8c000000 | (vidc.h_display_start << 14));
284 vidc_writel(0x90000000 | (vidc.h_display_end << 14));
285 vidc_writel(0x94000000 | (vidc.h_border_end << 14));
286 vidc_writel(0x98000000);
287 vidc_writel(0x9c000000 | (vidc.h_interlace << 14));
288 vidc_writel(0xa0000000 | (vidc.v_cycle << 14));
289 vidc_writel(0xa4000000 | (vidc.v_sync_width << 14));
290 vidc_writel(0xa8000000 | (vidc.v_border_start << 14));
291 vidc_writel(0xac000000 | (vidc.v_display_start << 14));
292 vidc_writel(0xb0000000 | (vidc.v_display_end << 14));
293 vidc_writel(0xb4000000 | (vidc.v_border_end << 14));
294 vidc_writel(0xb8000000);
295 vidc_writel(0xbc000000);
296 }
297 #ifdef DEBUG_MODE_SELECTION
298 printk(KERN_DEBUG "VIDC registers for %dx%dx%d:\n", var->xres,
299 var->yres, var->bits_per_pixel);
300 printk(KERN_DEBUG " H-cycle : %d\n", vidc.h_cycle);
301 printk(KERN_DEBUG " H-sync-width : %d\n", vidc.h_sync_width);
302 printk(KERN_DEBUG " H-border-start : %d\n", vidc.h_border_start);
303 printk(KERN_DEBUG " H-display-start : %d\n", vidc.h_display_start);
304 printk(KERN_DEBUG " H-display-end : %d\n", vidc.h_display_end);
305 printk(KERN_DEBUG " H-border-end : %d\n", vidc.h_border_end);
306 printk(KERN_DEBUG " H-interlace : %d\n", vidc.h_interlace);
307 printk(KERN_DEBUG " V-cycle : %d\n", vidc.v_cycle);
308 printk(KERN_DEBUG " V-sync-width : %d\n", vidc.v_sync_width);
309 printk(KERN_DEBUG " V-border-start : %d\n", vidc.v_border_start);
310 printk(KERN_DEBUG " V-display-start : %d\n", vidc.v_display_start);
311 printk(KERN_DEBUG " V-display-end : %d\n", vidc.v_display_end);
312 printk(KERN_DEBUG " V-border-end : %d\n", vidc.v_border_end);
313 printk(KERN_DEBUG " VIDC Ctrl (E) : 0x%08X\n", vidc_ctl);
314 printk(KERN_DEBUG " IOEB Ctrl : 0x%08X\n", vid_ctl);
315 #endif
316 }
317
318 static int
319 acornfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
320 u_int trans, struct fb_info *info)
321 {
322 union palette pal;
323
324 if (regno >= current_par.palette_size)
325 return 1;
326
327 pal.p = 0;
328 pal.vidc.reg = regno;
329 pal.vidc.red = red >> 12;
330 pal.vidc.green = green >> 12;
331 pal.vidc.blue = blue >> 12;
332
333 current_par.palette[regno] = pal;
334
335 vidc_writel(pal.p);
336
337 return 0;
338 }
339 #endif
340
341 #ifdef HAS_VIDC20
342 #include <mach/acornfb.h>
343
344 #define MAX_SIZE 2*1024*1024
345
346 /* VIDC20 has a different set of rules from the VIDC:
347 * hcr : must be multiple of 4
348 * hswr : must be even
349 * hdsr : must be even
350 * hder : must be even
351 * vcr : >= 2, (interlace, must be odd)
352 * vswr : >= 1
353 * vdsr : >= 1
354 * vder : >= vdsr
355 */
356 static void acornfb_set_timing(struct fb_info *info)
357 {
358 struct fb_var_screeninfo *var = &info->var;
359 struct vidc_timing vidc;
360 u_int vcr, fsize;
361 u_int ext_ctl, dat_ctl;
362 u_int words_per_line;
363
364 memset(&vidc, 0, sizeof(vidc));
365
366 vidc.h_sync_width = var->hsync_len - 8;
367 vidc.h_border_start = vidc.h_sync_width + var->left_margin + 8 - 12;
368 vidc.h_display_start = vidc.h_border_start + 12 - 18;
369 vidc.h_display_end = vidc.h_display_start + var->xres;
370 vidc.h_border_end = vidc.h_display_end + 18 - 12;
371 vidc.h_cycle = vidc.h_border_end + var->right_margin + 12 - 8;
372 vidc.h_interlace = vidc.h_cycle / 2;
373 vidc.v_sync_width = var->vsync_len - 1;
374 vidc.v_border_start = vidc.v_sync_width + var->upper_margin;
375 vidc.v_display_start = vidc.v_border_start;
376 vidc.v_display_end = vidc.v_display_start + var->yres;
377 vidc.v_border_end = vidc.v_display_end;
378 vidc.control = acornfb_default_control();
379
380 vcr = var->vsync_len + var->upper_margin + var->yres +
381 var->lower_margin;
382
383 if ((var->vmode & FB_VMODE_MASK) == FB_VMODE_INTERLACED) {
384 vidc.v_cycle = (vcr - 3) / 2;
385 vidc.control |= VIDC20_CTRL_INT;
386 } else
387 vidc.v_cycle = vcr - 2;
388
389 switch (var->bits_per_pixel) {
390 case 1: vidc.control |= VIDC20_CTRL_1BPP; break;
391 case 2: vidc.control |= VIDC20_CTRL_2BPP; break;
392 case 4: vidc.control |= VIDC20_CTRL_4BPP; break;
393 default:
394 case 8: vidc.control |= VIDC20_CTRL_8BPP; break;
395 case 16: vidc.control |= VIDC20_CTRL_16BPP; break;
396 case 32: vidc.control |= VIDC20_CTRL_32BPP; break;
397 }
398
399 acornfb_vidc20_find_rates(&vidc, var);
400 fsize = var->vsync_len + var->upper_margin + var->lower_margin - 1;
401
402 if (memcmp(&current_vidc, &vidc, sizeof(vidc))) {
403 current_vidc = vidc;
404
405 vidc_writel(VIDC20_CTRL| vidc.control);
406 vidc_writel(0xd0000000 | vidc.pll_ctl);
407 vidc_writel(0x80000000 | vidc.h_cycle);
408 vidc_writel(0x81000000 | vidc.h_sync_width);
409 vidc_writel(0x82000000 | vidc.h_border_start);
410 vidc_writel(0x83000000 | vidc.h_display_start);
411 vidc_writel(0x84000000 | vidc.h_display_end);
412 vidc_writel(0x85000000 | vidc.h_border_end);
413 vidc_writel(0x86000000);
414 vidc_writel(0x87000000 | vidc.h_interlace);
415 vidc_writel(0x90000000 | vidc.v_cycle);
416 vidc_writel(0x91000000 | vidc.v_sync_width);
417 vidc_writel(0x92000000 | vidc.v_border_start);
418 vidc_writel(0x93000000 | vidc.v_display_start);
419 vidc_writel(0x94000000 | vidc.v_display_end);
420 vidc_writel(0x95000000 | vidc.v_border_end);
421 vidc_writel(0x96000000);
422 vidc_writel(0x97000000);
423 }
424
425 iomd_writel(fsize, IOMD_FSIZE);
426
427 ext_ctl = acornfb_default_econtrol();
428
429 if (var->sync & FB_SYNC_COMP_HIGH_ACT) /* should be FB_SYNC_COMP */
430 ext_ctl |= VIDC20_ECTL_HS_NCSYNC | VIDC20_ECTL_VS_NCSYNC;
431 else {
432 if (var->sync & FB_SYNC_HOR_HIGH_ACT)
433 ext_ctl |= VIDC20_ECTL_HS_HSYNC;
434 else
435 ext_ctl |= VIDC20_ECTL_HS_NHSYNC;
436
437 if (var->sync & FB_SYNC_VERT_HIGH_ACT)
438 ext_ctl |= VIDC20_ECTL_VS_VSYNC;
439 else
440 ext_ctl |= VIDC20_ECTL_VS_NVSYNC;
441 }
442
443 vidc_writel(VIDC20_ECTL | ext_ctl);
444
445 words_per_line = var->xres * var->bits_per_pixel / 32;
446
447 if (current_par.using_vram && info->fix.smem_len == 2048*1024)
448 words_per_line /= 2;
449
450 /* RiscPC doesn't use the VIDC's VRAM control. */
451 dat_ctl = VIDC20_DCTL_VRAM_DIS | VIDC20_DCTL_SNA | words_per_line;
452
453 /* The data bus width is dependent on both the type
454 * and amount of video memory.
455 * DRAM 32bit low
456 * 1MB VRAM 32bit
457 * 2MB VRAM 64bit
458 */
459 if (current_par.using_vram && current_par.vram_half_sam == 2048)
460 dat_ctl |= VIDC20_DCTL_BUS_D63_0;
461 else
462 dat_ctl |= VIDC20_DCTL_BUS_D31_0;
463
464 vidc_writel(VIDC20_DCTL | dat_ctl);
465
466 #ifdef DEBUG_MODE_SELECTION
467 printk(KERN_DEBUG "VIDC registers for %dx%dx%d:\n", var->xres,
468 var->yres, var->bits_per_pixel);
469 printk(KERN_DEBUG " H-cycle : %d\n", vidc.h_cycle);
470 printk(KERN_DEBUG " H-sync-width : %d\n", vidc.h_sync_width);
471 printk(KERN_DEBUG " H-border-start : %d\n", vidc.h_border_start);
472 printk(KERN_DEBUG " H-display-start : %d\n", vidc.h_display_start);
473 printk(KERN_DEBUG " H-display-end : %d\n", vidc.h_display_end);
474 printk(KERN_DEBUG " H-border-end : %d\n", vidc.h_border_end);
475 printk(KERN_DEBUG " H-interlace : %d\n", vidc.h_interlace);
476 printk(KERN_DEBUG " V-cycle : %d\n", vidc.v_cycle);
477 printk(KERN_DEBUG " V-sync-width : %d\n", vidc.v_sync_width);
478 printk(KERN_DEBUG " V-border-start : %d\n", vidc.v_border_start);
479 printk(KERN_DEBUG " V-display-start : %d\n", vidc.v_display_start);
480 printk(KERN_DEBUG " V-display-end : %d\n", vidc.v_display_end);
481 printk(KERN_DEBUG " V-border-end : %d\n", vidc.v_border_end);
482 printk(KERN_DEBUG " Ext Ctrl (C) : 0x%08X\n", ext_ctl);
483 printk(KERN_DEBUG " PLL Ctrl (D) : 0x%08X\n", vidc.pll_ctl);
484 printk(KERN_DEBUG " Ctrl (E) : 0x%08X\n", vidc.control);
485 printk(KERN_DEBUG " Data Ctrl (F) : 0x%08X\n", dat_ctl);
486 printk(KERN_DEBUG " Fsize : 0x%08X\n", fsize);
487 #endif
488 }
489
490 /*
491 * We have to take note of the VIDC20's 16-bit palette here.
492 * The VIDC20 looks up a 16 bit pixel as follows:
493 *
494 * bits 111111
495 * 5432109876543210
496 * red ++++++++ (8 bits, 7 to 0)
497 * green ++++++++ (8 bits, 11 to 4)
498 * blue ++++++++ (8 bits, 15 to 8)
499 *
500 * We use a pixel which looks like:
501 *
502 * bits 111111
503 * 5432109876543210
504 * red +++++ (5 bits, 4 to 0)
505 * green +++++ (5 bits, 9 to 5)
506 * blue +++++ (5 bits, 14 to 10)
507 */
508 static int
509 acornfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
510 u_int trans, struct fb_info *info)
511 {
512 union palette pal;
513
514 if (regno >= current_par.palette_size)
515 return 1;
516
517 if (regno < 16 && info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
518 u32 pseudo_val;
519
520 pseudo_val = regno << info->var.red.offset;
521 pseudo_val |= regno << info->var.green.offset;
522 pseudo_val |= regno << info->var.blue.offset;
523
524 ((u32 *)info->pseudo_palette)[regno] = pseudo_val;
525 }
526
527 pal.p = 0;
528 pal.vidc20.red = red >> 8;
529 pal.vidc20.green = green >> 8;
530 pal.vidc20.blue = blue >> 8;
531
532 current_par.palette[regno] = pal;
533
534 if (info->var.bits_per_pixel == 16) {
535 int i;
536
537 pal.p = 0;
538 vidc_writel(0x10000000);
539 for (i = 0; i < 256; i += 1) {
540 pal.vidc20.red = current_par.palette[ i & 31].vidc20.red;
541 pal.vidc20.green = current_par.palette[(i >> 1) & 31].vidc20.green;
542 pal.vidc20.blue = current_par.palette[(i >> 2) & 31].vidc20.blue;
543 vidc_writel(pal.p);
544 /* Palette register pointer auto-increments */
545 }
546 } else {
547 vidc_writel(0x10000000 | regno);
548 vidc_writel(pal.p);
549 }
550
551 return 0;
552 }
553 #endif
554
555 /*
556 * Before selecting the timing parameters, adjust
557 * the resolution to fit the rules.
558 */
559 static int
560 acornfb_adjust_timing(struct fb_info *info, struct fb_var_screeninfo *var, u_int fontht)
561 {
562 u_int font_line_len, sam_size, min_size, size, nr_y;
563
564 /* xres must be even */
565 var->xres = (var->xres + 1) & ~1;
566
567 /*
568 * We don't allow xres_virtual to differ from xres
569 */
570 var->xres_virtual = var->xres;
571 var->xoffset = 0;
572
573 if (current_par.using_vram)
574 sam_size = current_par.vram_half_sam * 2;
575 else
576 sam_size = 16;
577
578 /*
579 * Now, find a value for yres_virtual which allows
580 * us to do ywrap scrolling. The value of
581 * yres_virtual must be such that the end of the
582 * displayable frame buffer must be aligned with
583 * the start of a font line.
584 */
585 font_line_len = var->xres * var->bits_per_pixel * fontht / 8;
586 min_size = var->xres * var->yres * var->bits_per_pixel / 8;
587
588 /*
589 * If minimum screen size is greater than that we have
590 * available, reject it.
591 */
592 if (min_size > info->fix.smem_len)
593 return -EINVAL;
594
595 /* Find int 'y', such that y * fll == s * sam < maxsize
596 * y = s * sam / fll; s = maxsize / sam
597 */
598 for (size = info->fix.smem_len;
599 nr_y = size / font_line_len, min_size <= size;
600 size -= sam_size) {
601 if (nr_y * font_line_len == size)
602 break;
603 }
604 nr_y *= fontht;
605
606 if (var->accel_flags & FB_ACCELF_TEXT) {
607 if (min_size > size) {
608 /*
609 * failed, use ypan
610 */
611 size = info->fix.smem_len;
612 var->yres_virtual = size / (font_line_len / fontht);
613 } else
614 var->yres_virtual = nr_y;
615 } else if (var->yres_virtual > nr_y)
616 var->yres_virtual = nr_y;
617
618 current_par.screen_end = info->fix.smem_start + size;
619
620 /*
621 * Fix yres & yoffset if needed.
622 */
623 if (var->yres > var->yres_virtual)
624 var->yres = var->yres_virtual;
625
626 if (var->vmode & FB_VMODE_YWRAP) {
627 if (var->yoffset > var->yres_virtual)
628 var->yoffset = var->yres_virtual;
629 } else {
630 if (var->yoffset + var->yres > var->yres_virtual)
631 var->yoffset = var->yres_virtual - var->yres;
632 }
633
634 /* hsync_len must be even */
635 var->hsync_len = (var->hsync_len + 1) & ~1;
636
637 #ifdef HAS_VIDC
638 /* left_margin must be odd */
639 if ((var->left_margin & 1) == 0) {
640 var->left_margin -= 1;
641 var->right_margin += 1;
642 }
643
644 /* right_margin must be odd */
645 var->right_margin |= 1;
646 #elif defined(HAS_VIDC20)
647 /* left_margin must be even */
648 if (var->left_margin & 1) {
649 var->left_margin += 1;
650 var->right_margin -= 1;
651 }
652
653 /* right_margin must be even */
654 if (var->right_margin & 1)
655 var->right_margin += 1;
656 #endif
657
658 if (var->vsync_len < 1)
659 var->vsync_len = 1;
660
661 return 0;
662 }
663
664 static int
665 acornfb_validate_timing(struct fb_var_screeninfo *var,
666 struct fb_monspecs *monspecs)
667 {
668 unsigned long hs, vs;
669
670 /*
671 * hs(Hz) = 10^12 / (pixclock * xtotal)
672 * vs(Hz) = hs(Hz) / ytotal
673 *
674 * No need to do long long divisions or anything
675 * like that if you factor it correctly
676 */
677 hs = 1953125000 / var->pixclock;
678 hs = hs * 512 /
679 (var->xres + var->left_margin + var->right_margin + var->hsync_len);
680 vs = hs /
681 (var->yres + var->upper_margin + var->lower_margin + var->vsync_len);
682
683 return (vs >= monspecs->vfmin && vs <= monspecs->vfmax &&
684 hs >= monspecs->hfmin && hs <= monspecs->hfmax) ? 0 : -EINVAL;
685 }
686
687 static inline void
688 acornfb_update_dma(struct fb_info *info, struct fb_var_screeninfo *var)
689 {
690 u_int off = var->yoffset * info->fix.line_length;
691
692 #if defined(HAS_MEMC)
693 memc_write(VDMA_INIT, off >> 2);
694 #elif defined(HAS_IOMD)
695 iomd_writel(info->fix.smem_start + off, IOMD_VIDINIT);
696 #endif
697 }
698
699 static int
700 acornfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
701 {
702 u_int fontht;
703 int err;
704
705 /*
706 * FIXME: Find the font height
707 */
708 fontht = 8;
709
710 var->red.msb_right = 0;
711 var->green.msb_right = 0;
712 var->blue.msb_right = 0;
713 var->transp.msb_right = 0;
714
715 switch (var->bits_per_pixel) {
716 case 1: case 2: case 4: case 8:
717 var->red.offset = 0;
718 var->red.length = var->bits_per_pixel;
719 var->green = var->red;
720 var->blue = var->red;
721 var->transp.offset = 0;
722 var->transp.length = 0;
723 break;
724
725 #ifdef HAS_VIDC20
726 case 16:
727 var->red.offset = 0;
728 var->red.length = 5;
729 var->green.offset = 5;
730 var->green.length = 5;
731 var->blue.offset = 10;
732 var->blue.length = 5;
733 var->transp.offset = 15;
734 var->transp.length = 1;
735 break;
736
737 case 32:
738 var->red.offset = 0;
739 var->red.length = 8;
740 var->green.offset = 8;
741 var->green.length = 8;
742 var->blue.offset = 16;
743 var->blue.length = 8;
744 var->transp.offset = 24;
745 var->transp.length = 4;
746 break;
747 #endif
748 default:
749 return -EINVAL;
750 }
751
752 /*
753 * Check to see if the pixel rate is valid.
754 */
755 if (!acornfb_valid_pixrate(var))
756 return -EINVAL;
757
758 /*
759 * Validate and adjust the resolution to
760 * match the video generator hardware.
761 */
762 err = acornfb_adjust_timing(info, var, fontht);
763 if (err)
764 return err;
765
766 /*
767 * Validate the timing against the
768 * monitor hardware.
769 */
770 return acornfb_validate_timing(var, &info->monspecs);
771 }
772
773 static int acornfb_set_par(struct fb_info *info)
774 {
775 switch (info->var.bits_per_pixel) {
776 case 1:
777 current_par.palette_size = 2;
778 info->fix.visual = FB_VISUAL_MONO10;
779 break;
780 case 2:
781 current_par.palette_size = 4;
782 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
783 break;
784 case 4:
785 current_par.palette_size = 16;
786 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
787 break;
788 case 8:
789 current_par.palette_size = VIDC_PALETTE_SIZE;
790 #ifdef HAS_VIDC
791 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
792 #else
793 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
794 #endif
795 break;
796 #ifdef HAS_VIDC20
797 case 16:
798 current_par.palette_size = 32;
799 info->fix.visual = FB_VISUAL_DIRECTCOLOR;
800 break;
801 case 32:
802 current_par.palette_size = VIDC_PALETTE_SIZE;
803 info->fix.visual = FB_VISUAL_DIRECTCOLOR;
804 break;
805 #endif
806 default:
807 BUG();
808 }
809
810 info->fix.line_length = (info->var.xres * info->var.bits_per_pixel) / 8;
811
812 #if defined(HAS_MEMC)
813 {
814 unsigned long size = info->fix.smem_len - VDMA_XFERSIZE;
815
816 memc_write(VDMA_START, 0);
817 memc_write(VDMA_END, size >> 2);
818 }
819 #elif defined(HAS_IOMD)
820 {
821 unsigned long start, size;
822 u_int control;
823
824 start = info->fix.smem_start;
825 size = current_par.screen_end;
826
827 if (current_par.using_vram) {
828 size -= current_par.vram_half_sam;
829 control = DMA_CR_E | (current_par.vram_half_sam / 256);
830 } else {
831 size -= 16;
832 control = DMA_CR_E | DMA_CR_D | 16;
833 }
834
835 iomd_writel(start, IOMD_VIDSTART);
836 iomd_writel(size, IOMD_VIDEND);
837 iomd_writel(control, IOMD_VIDCR);
838 }
839 #endif
840
841 acornfb_update_dma(info, &info->var);
842 acornfb_set_timing(info);
843
844 return 0;
845 }
846
847 static int
848 acornfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
849 {
850 u_int y_bottom = var->yoffset;
851
852 if (!(var->vmode & FB_VMODE_YWRAP))
853 y_bottom += var->yres;
854
855 BUG_ON(y_bottom > var->yres_virtual);
856
857 acornfb_update_dma(info, var);
858
859 return 0;
860 }
861
862 /*
863 * Note that we are entered with the kernel locked.
864 */
865 static int
866 acornfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
867 {
868 unsigned long off, start;
869 u32 len;
870
871 off = vma->vm_pgoff << PAGE_SHIFT;
872
873 start = info->fix.smem_start;
874 len = PAGE_ALIGN(start & ~PAGE_MASK) + info->fix.smem_len;
875 start &= PAGE_MASK;
876 if ((vma->vm_end - vma->vm_start + off) > len)
877 return -EINVAL;
878 off += start;
879 vma->vm_pgoff = off >> PAGE_SHIFT;
880
881 /* This is an IO map - tell maydump to skip this VMA */
882 vma->vm_flags |= VM_IO;
883
884 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
885
886 /*
887 * Don't alter the page protection flags; we want to keep the area
888 * cached for better performance. This does mean that we may miss
889 * some updates to the screen occasionally, but process switches
890 * should cause the caches and buffers to be flushed often enough.
891 */
892 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
893 vma->vm_end - vma->vm_start,
894 vma->vm_page_prot))
895 return -EAGAIN;
896 return 0;
897 }
898
899 static struct fb_ops acornfb_ops = {
900 .owner = THIS_MODULE,
901 .fb_check_var = acornfb_check_var,
902 .fb_set_par = acornfb_set_par,
903 .fb_setcolreg = acornfb_setcolreg,
904 .fb_pan_display = acornfb_pan_display,
905 .fb_fillrect = cfb_fillrect,
906 .fb_copyarea = cfb_copyarea,
907 .fb_imageblit = cfb_imageblit,
908 .fb_mmap = acornfb_mmap,
909 };
910
911 /*
912 * Everything after here is initialisation!!!
913 */
914 static struct fb_videomode modedb[] __initdata = {
915 { /* 320x256 @ 50Hz */
916 NULL, 50, 320, 256, 125000, 92, 62, 35, 19, 38, 2,
917 FB_SYNC_COMP_HIGH_ACT,
918 FB_VMODE_NONINTERLACED
919 }, { /* 640x250 @ 50Hz, 15.6 kHz hsync */
920 NULL, 50, 640, 250, 62500, 185, 123, 38, 21, 76, 3,
921 0,
922 FB_VMODE_NONINTERLACED
923 }, { /* 640x256 @ 50Hz, 15.6 kHz hsync */
924 NULL, 50, 640, 256, 62500, 185, 123, 35, 18, 76, 3,
925 0,
926 FB_VMODE_NONINTERLACED
927 }, { /* 640x512 @ 50Hz, 26.8 kHz hsync */
928 NULL, 50, 640, 512, 41667, 113, 87, 18, 1, 56, 3,
929 0,
930 FB_VMODE_NONINTERLACED
931 }, { /* 640x250 @ 70Hz, 31.5 kHz hsync */
932 NULL, 70, 640, 250, 39722, 48, 16, 109, 88, 96, 2,
933 0,
934 FB_VMODE_NONINTERLACED
935 }, { /* 640x256 @ 70Hz, 31.5 kHz hsync */
936 NULL, 70, 640, 256, 39722, 48, 16, 106, 85, 96, 2,
937 0,
938 FB_VMODE_NONINTERLACED
939 }, { /* 640x352 @ 70Hz, 31.5 kHz hsync */
940 NULL, 70, 640, 352, 39722, 48, 16, 58, 37, 96, 2,
941 0,
942 FB_VMODE_NONINTERLACED
943 }, { /* 640x480 @ 60Hz, 31.5 kHz hsync */
944 NULL, 60, 640, 480, 39722, 48, 16, 32, 11, 96, 2,
945 0,
946 FB_VMODE_NONINTERLACED
947 }, { /* 800x600 @ 56Hz, 35.2 kHz hsync */
948 NULL, 56, 800, 600, 27778, 101, 23, 22, 1, 100, 2,
949 0,
950 FB_VMODE_NONINTERLACED
951 }, { /* 896x352 @ 60Hz, 21.8 kHz hsync */
952 NULL, 60, 896, 352, 41667, 59, 27, 9, 0, 118, 3,
953 0,
954 FB_VMODE_NONINTERLACED
955 }, { /* 1024x 768 @ 60Hz, 48.4 kHz hsync */
956 NULL, 60, 1024, 768, 15385, 160, 24, 29, 3, 136, 6,
957 0,
958 FB_VMODE_NONINTERLACED
959 }, { /* 1280x1024 @ 60Hz, 63.8 kHz hsync */
960 NULL, 60, 1280, 1024, 9090, 186, 96, 38, 1, 160, 3,
961 0,
962 FB_VMODE_NONINTERLACED
963 }
964 };
965
966 static struct fb_videomode __initdata
967 acornfb_default_mode = {
968 .name = NULL,
969 .refresh = 60,
970 .xres = 640,
971 .yres = 480,
972 .pixclock = 39722,
973 .left_margin = 56,
974 .right_margin = 16,
975 .upper_margin = 34,
976 .lower_margin = 9,
977 .hsync_len = 88,
978 .vsync_len = 2,
979 .sync = 0,
980 .vmode = FB_VMODE_NONINTERLACED
981 };
982
983 static void __init acornfb_init_fbinfo(void)
984 {
985 static int first = 1;
986
987 if (!first)
988 return;
989 first = 0;
990
991 fb_info.fbops = &acornfb_ops;
992 fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
993 fb_info.pseudo_palette = current_par.pseudo_palette;
994
995 strcpy(fb_info.fix.id, "Acorn");
996 fb_info.fix.type = FB_TYPE_PACKED_PIXELS;
997 fb_info.fix.type_aux = 0;
998 fb_info.fix.xpanstep = 0;
999 fb_info.fix.ypanstep = 1;
1000 fb_info.fix.ywrapstep = 1;
1001 fb_info.fix.line_length = 0;
1002 fb_info.fix.accel = FB_ACCEL_NONE;
1003
1004 /*
1005 * setup initial parameters
1006 */
1007 memset(&fb_info.var, 0, sizeof(fb_info.var));
1008
1009 #if defined(HAS_VIDC20)
1010 fb_info.var.red.length = 8;
1011 fb_info.var.transp.length = 4;
1012 #elif defined(HAS_VIDC)
1013 fb_info.var.red.length = 4;
1014 fb_info.var.transp.length = 1;
1015 #endif
1016 fb_info.var.green = fb_info.var.red;
1017 fb_info.var.blue = fb_info.var.red;
1018 fb_info.var.nonstd = 0;
1019 fb_info.var.activate = FB_ACTIVATE_NOW;
1020 fb_info.var.height = -1;
1021 fb_info.var.width = -1;
1022 fb_info.var.vmode = FB_VMODE_NONINTERLACED;
1023 fb_info.var.accel_flags = FB_ACCELF_TEXT;
1024
1025 current_par.dram_size = 0;
1026 current_par.montype = -1;
1027 current_par.dpms = 0;
1028 }
1029
1030 /*
1031 * setup acornfb options:
1032 *
1033 * mon:hmin-hmax:vmin-vmax:dpms:width:height
1034 * Set monitor parameters:
1035 * hmin = horizontal minimum frequency (Hz)
1036 * hmax = horizontal maximum frequency (Hz) (optional)
1037 * vmin = vertical minimum frequency (Hz)
1038 * vmax = vertical maximum frequency (Hz) (optional)
1039 * dpms = DPMS supported? (optional)
1040 * width = width of picture in mm. (optional)
1041 * height = height of picture in mm. (optional)
1042 *
1043 * montype:type
1044 * Set RISC-OS style monitor type:
1045 * 0 (or tv) - TV frequency
1046 * 1 (or multi) - Multi frequency
1047 * 2 (or hires) - Hi-res monochrome
1048 * 3 (or vga) - VGA
1049 * 4 (or svga) - SVGA
1050 * auto, or option missing
1051 * - try hardware detect
1052 *
1053 * dram:size
1054 * Set the amount of DRAM to use for the frame buffer
1055 * (even if you have VRAM).
1056 * size can optionally be followed by 'M' or 'K' for
1057 * MB or KB respectively.
1058 */
1059 static void __init
1060 acornfb_parse_mon(char *opt)
1061 {
1062 char *p = opt;
1063
1064 current_par.montype = -2;
1065
1066 fb_info.monspecs.hfmin = simple_strtoul(p, &p, 0);
1067 if (*p == '-')
1068 fb_info.monspecs.hfmax = simple_strtoul(p + 1, &p, 0);
1069 else
1070 fb_info.monspecs.hfmax = fb_info.monspecs.hfmin;
1071
1072 if (*p != ':')
1073 goto bad;
1074
1075 fb_info.monspecs.vfmin = simple_strtoul(p + 1, &p, 0);
1076 if (*p == '-')
1077 fb_info.monspecs.vfmax = simple_strtoul(p + 1, &p, 0);
1078 else
1079 fb_info.monspecs.vfmax = fb_info.monspecs.vfmin;
1080
1081 if (*p != ':')
1082 goto check_values;
1083
1084 fb_info.monspecs.dpms = simple_strtoul(p + 1, &p, 0);
1085
1086 if (*p != ':')
1087 goto check_values;
1088
1089 fb_info.var.width = simple_strtoul(p + 1, &p, 0);
1090
1091 if (*p != ':')
1092 goto check_values;
1093
1094 fb_info.var.height = simple_strtoul(p + 1, NULL, 0);
1095
1096 check_values:
1097 if (fb_info.monspecs.hfmax < fb_info.monspecs.hfmin ||
1098 fb_info.monspecs.vfmax < fb_info.monspecs.vfmin)
1099 goto bad;
1100 return;
1101
1102 bad:
1103 printk(KERN_ERR "Acornfb: bad monitor settings: %s\n", opt);
1104 current_par.montype = -1;
1105 }
1106
1107 static void __init
1108 acornfb_parse_montype(char *opt)
1109 {
1110 current_par.montype = -2;
1111
1112 if (strncmp(opt, "tv", 2) == 0) {
1113 opt += 2;
1114 current_par.montype = 0;
1115 } else if (strncmp(opt, "multi", 5) == 0) {
1116 opt += 5;
1117 current_par.montype = 1;
1118 } else if (strncmp(opt, "hires", 5) == 0) {
1119 opt += 5;
1120 current_par.montype = 2;
1121 } else if (strncmp(opt, "vga", 3) == 0) {
1122 opt += 3;
1123 current_par.montype = 3;
1124 } else if (strncmp(opt, "svga", 4) == 0) {
1125 opt += 4;
1126 current_par.montype = 4;
1127 } else if (strncmp(opt, "auto", 4) == 0) {
1128 opt += 4;
1129 current_par.montype = -1;
1130 } else if (isdigit(*opt))
1131 current_par.montype = simple_strtoul(opt, &opt, 0);
1132
1133 if (current_par.montype == -2 ||
1134 current_par.montype > NR_MONTYPES) {
1135 printk(KERN_ERR "acornfb: unknown monitor type: %s\n",
1136 opt);
1137 current_par.montype = -1;
1138 } else
1139 if (opt && *opt) {
1140 if (strcmp(opt, ",dpms") == 0)
1141 current_par.dpms = 1;
1142 else
1143 printk(KERN_ERR
1144 "acornfb: unknown monitor option: %s\n",
1145 opt);
1146 }
1147 }
1148
1149 static void __init
1150 acornfb_parse_dram(char *opt)
1151 {
1152 unsigned int size;
1153
1154 size = simple_strtoul(opt, &opt, 0);
1155
1156 if (opt) {
1157 switch (*opt) {
1158 case 'M':
1159 case 'm':
1160 size *= 1024;
1161 case 'K':
1162 case 'k':
1163 size *= 1024;
1164 default:
1165 break;
1166 }
1167 }
1168
1169 current_par.dram_size = size;
1170 }
1171
1172 static struct options {
1173 char *name;
1174 void (*parse)(char *opt);
1175 } opt_table[] __initdata = {
1176 { "mon", acornfb_parse_mon },
1177 { "montype", acornfb_parse_montype },
1178 { "dram", acornfb_parse_dram },
1179 { NULL, NULL }
1180 };
1181
1182 int __init
1183 acornfb_setup(char *options)
1184 {
1185 struct options *optp;
1186 char *opt;
1187
1188 if (!options || !*options)
1189 return 0;
1190
1191 acornfb_init_fbinfo();
1192
1193 while ((opt = strsep(&options, ",")) != NULL) {
1194 if (!*opt)
1195 continue;
1196
1197 for (optp = opt_table; optp->name; optp++) {
1198 int optlen;
1199
1200 optlen = strlen(optp->name);
1201
1202 if (strncmp(opt, optp->name, optlen) == 0 &&
1203 opt[optlen] == ':') {
1204 optp->parse(opt + optlen + 1);
1205 break;
1206 }
1207 }
1208
1209 if (!optp->name)
1210 printk(KERN_ERR "acornfb: unknown parameter: %s\n",
1211 opt);
1212 }
1213 return 0;
1214 }
1215
1216 /*
1217 * Detect type of monitor connected
1218 * For now, we just assume SVGA
1219 */
1220 static int __init
1221 acornfb_detect_monitortype(void)
1222 {
1223 return 4;
1224 }
1225
1226 /*
1227 * This enables the unused memory to be freed on older Acorn machines.
1228 * We are freeing memory on behalf of the architecture initialisation
1229 * code here.
1230 */
1231 static inline void
1232 free_unused_pages(unsigned int virtual_start, unsigned int virtual_end)
1233 {
1234 int mb_freed = 0;
1235
1236 /*
1237 * Align addresses
1238 */
1239 virtual_start = PAGE_ALIGN(virtual_start);
1240 virtual_end = PAGE_ALIGN(virtual_end);
1241
1242 while (virtual_start < virtual_end) {
1243 struct page *page;
1244
1245 /*
1246 * Clear page reserved bit,
1247 * set count to 1, and free
1248 * the page.
1249 */
1250 page = virt_to_page(virtual_start);
1251 ClearPageReserved(page);
1252 init_page_count(page);
1253 free_page(virtual_start);
1254
1255 virtual_start += PAGE_SIZE;
1256 mb_freed += PAGE_SIZE / 1024;
1257 }
1258
1259 printk("acornfb: freed %dK memory\n", mb_freed);
1260 }
1261
1262 static int __init acornfb_probe(struct platform_device *dev)
1263 {
1264 unsigned long size;
1265 u_int h_sync, v_sync;
1266 int rc, i;
1267 char *option = NULL;
1268
1269 if (fb_get_options("acornfb", &option))
1270 return -ENODEV;
1271 acornfb_setup(option);
1272
1273 acornfb_init_fbinfo();
1274
1275 current_par.dev = &dev->dev;
1276
1277 if (current_par.montype == -1)
1278 current_par.montype = acornfb_detect_monitortype();
1279
1280 if (current_par.montype == -1 || current_par.montype > NR_MONTYPES)
1281 current_par.montype = 4;
1282
1283 if (current_par.montype >= 0) {
1284 fb_info.monspecs = monspecs[current_par.montype];
1285 fb_info.monspecs.dpms = current_par.dpms;
1286 }
1287
1288 /*
1289 * Try to select a suitable default mode
1290 */
1291 for (i = 0; i < ARRAY_SIZE(modedb); i++) {
1292 unsigned long hs;
1293
1294 hs = modedb[i].refresh *
1295 (modedb[i].yres + modedb[i].upper_margin +
1296 modedb[i].lower_margin + modedb[i].vsync_len);
1297 if (modedb[i].xres == DEFAULT_XRES &&
1298 modedb[i].yres == DEFAULT_YRES &&
1299 modedb[i].refresh >= fb_info.monspecs.vfmin &&
1300 modedb[i].refresh <= fb_info.monspecs.vfmax &&
1301 hs >= fb_info.monspecs.hfmin &&
1302 hs <= fb_info.monspecs.hfmax) {
1303 acornfb_default_mode = modedb[i];
1304 break;
1305 }
1306 }
1307
1308 fb_info.screen_base = (char *)SCREEN_BASE;
1309 fb_info.fix.smem_start = SCREEN_START;
1310 current_par.using_vram = 0;
1311
1312 /*
1313 * If vram_size is set, we are using VRAM in
1314 * a Risc PC. However, if the user has specified
1315 * an amount of DRAM then use that instead.
1316 */
1317 if (vram_size && !current_par.dram_size) {
1318 size = vram_size;
1319 current_par.vram_half_sam = vram_size / 1024;
1320 current_par.using_vram = 1;
1321 } else if (current_par.dram_size)
1322 size = current_par.dram_size;
1323 else
1324 size = MAX_SIZE;
1325
1326 /*
1327 * Limit maximum screen size.
1328 */
1329 if (size > MAX_SIZE)
1330 size = MAX_SIZE;
1331
1332 size = PAGE_ALIGN(size);
1333
1334 #if defined(HAS_VIDC20)
1335 if (!current_par.using_vram) {
1336 dma_addr_t handle;
1337 void *base;
1338
1339 /*
1340 * RiscPC needs to allocate the DRAM memory
1341 * for the framebuffer if we are not using
1342 * VRAM.
1343 */
1344 base = dma_alloc_writecombine(current_par.dev, size, &handle,
1345 GFP_KERNEL);
1346 if (base == NULL) {
1347 printk(KERN_ERR "acornfb: unable to allocate screen "
1348 "memory\n");
1349 return -ENOMEM;
1350 }
1351
1352 fb_info.screen_base = base;
1353 fb_info.fix.smem_start = handle;
1354 }
1355 #endif
1356 #if defined(HAS_VIDC)
1357 /*
1358 * Archimedes/A5000 machines use a fixed address for their
1359 * framebuffers. Free unused pages
1360 */
1361 free_unused_pages(PAGE_OFFSET + size, PAGE_OFFSET + MAX_SIZE);
1362 #endif
1363
1364 fb_info.fix.smem_len = size;
1365 current_par.palette_size = VIDC_PALETTE_SIZE;
1366
1367 /*
1368 * Lookup the timing for this resolution. If we can't
1369 * find it, then we can't restore it if we change
1370 * the resolution, so we disable this feature.
1371 */
1372 do {
1373 rc = fb_find_mode(&fb_info.var, &fb_info, NULL, modedb,
1374 ARRAY_SIZE(modedb),
1375 &acornfb_default_mode, DEFAULT_BPP);
1376 /*
1377 * If we found an exact match, all ok.
1378 */
1379 if (rc == 1)
1380 break;
1381
1382 rc = fb_find_mode(&fb_info.var, &fb_info, NULL, NULL, 0,
1383 &acornfb_default_mode, DEFAULT_BPP);
1384 /*
1385 * If we found an exact match, all ok.
1386 */
1387 if (rc == 1)
1388 break;
1389
1390 rc = fb_find_mode(&fb_info.var, &fb_info, NULL, modedb,
1391 ARRAY_SIZE(modedb),
1392 &acornfb_default_mode, DEFAULT_BPP);
1393 if (rc)
1394 break;
1395
1396 rc = fb_find_mode(&fb_info.var, &fb_info, NULL, NULL, 0,
1397 &acornfb_default_mode, DEFAULT_BPP);
1398 } while (0);
1399
1400 /*
1401 * If we didn't find an exact match, try the
1402 * generic database.
1403 */
1404 if (rc == 0) {
1405 printk("Acornfb: no valid mode found\n");
1406 return -EINVAL;
1407 }
1408
1409 h_sync = 1953125000 / fb_info.var.pixclock;
1410 h_sync = h_sync * 512 / (fb_info.var.xres + fb_info.var.left_margin +
1411 fb_info.var.right_margin + fb_info.var.hsync_len);
1412 v_sync = h_sync / (fb_info.var.yres + fb_info.var.upper_margin +
1413 fb_info.var.lower_margin + fb_info.var.vsync_len);
1414
1415 printk(KERN_INFO "Acornfb: %dkB %cRAM, %s, using %dx%d, "
1416 "%d.%03dkHz, %dHz\n",
1417 fb_info.fix.smem_len / 1024,
1418 current_par.using_vram ? 'V' : 'D',
1419 VIDC_NAME, fb_info.var.xres, fb_info.var.yres,
1420 h_sync / 1000, h_sync % 1000, v_sync);
1421
1422 printk(KERN_INFO "Acornfb: Monitor: %d.%03d-%d.%03dkHz, %d-%dHz%s\n",
1423 fb_info.monspecs.hfmin / 1000, fb_info.monspecs.hfmin % 1000,
1424 fb_info.monspecs.hfmax / 1000, fb_info.monspecs.hfmax % 1000,
1425 fb_info.monspecs.vfmin, fb_info.monspecs.vfmax,
1426 fb_info.monspecs.dpms ? ", DPMS" : "");
1427
1428 if (fb_set_var(&fb_info, &fb_info.var))
1429 printk(KERN_ERR "Acornfb: unable to set display parameters\n");
1430
1431 if (register_framebuffer(&fb_info) < 0)
1432 return -EINVAL;
1433 return 0;
1434 }
1435
1436 static struct platform_driver acornfb_driver = {
1437 .probe = acornfb_probe,
1438 .driver = {
1439 .name = "acornfb",
1440 },
1441 };
1442
1443 static int __init acornfb_init(void)
1444 {
1445 return platform_driver_register(&acornfb_driver);
1446 }
1447
1448 module_init(acornfb_init);
1449
1450 MODULE_AUTHOR("Russell King");
1451 MODULE_DESCRIPTION("VIDC 1/1a/20 framebuffer driver");
1452 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree