File: /usr/src/linux/drivers/video/pvr2fb.c
1 /* drivers/video/pvr2fb.c
2 *
3 * Frame buffer and fbcon support for the NEC PowerVR2 found within the Sega
4 * Dreamcast.
5 *
6 * Copyright (c) 2001 M. R. Brown <mrbrown@0xd6.org>
7 * Copyright (c) 2001 Paul Mundt <lethal@chaoticdreams.org>
8 *
9 * This file is part of the LinuxDC project (linuxdc.sourceforge.net).
10 *
11 */
12
13 /*
14 * This driver is mostly based on the excellent amifb and vfb sources. It uses
15 * an odd scheme for converting hardware values to/from framebuffer values, here are
16 * some hacked-up formulas:
17 *
18 * The Dreamcast has screen offsets from each side of it's four borders and the start
19 * offsets of the display window. I used these values to calculate 'pseudo' values
20 * (think of them as placeholders) for the fb video mode, so that when it came time
21 * to convert these values back into their hardware values, I could just add mode-
22 * specific offsets to get the correct mode settings:
23 *
24 * left_margin = diwstart_h - borderstart_h;
25 * right_margin = borderstop_h - (diwstart_h + xres);
26 * upper_margin = diwstart_v - borderstart_v;
27 * lower_margin = borderstop_v - (diwstart_h + yres);
28 *
29 * hsync_len = borderstart_h + (hsync_total - borderstop_h);
30 * vsync_len = borderstart_v + (vsync_total - borderstop_v);
31 *
32 * Then, when it's time to convert back to hardware settings, the only constants
33 * are the borderstart_* offsets, all other values are derived from the fb video
34 * mode:
35 *
36 * // PAL
37 * borderstart_h = 116;
38 * borderstart_v = 44;
39 * ...
40 * borderstop_h = borderstart_h + hsync_total - hsync_len;
41 * ...
42 * diwstart_v = borderstart_v - upper_margin;
43 *
44 * However, in the current implementation, the borderstart values haven't had
45 * the benefit of being fully researched, so some modes may be broken.
46 */
47
48 #include <linux/module.h>
49 #include <linux/kernel.h>
50 #include <linux/errno.h>
51 #include <linux/string.h>
52 #include <linux/mm.h>
53 #include <linux/tty.h>
54 #include <linux/slab.h>
55 #include <linux/delay.h>
56 #include <linux/config.h>
57 #include <linux/interrupt.h>
58 #include <linux/fb.h>
59 #include <linux/init.h>
60 #include <linux/console.h>
61
62 #ifdef CONFIG_SH_DREAMCAST
63 #include <asm/io.h>
64 #include <asm/machvec.h>
65 #include <asm/dc_sysasic.h>
66 #endif
67
68 #ifdef CONFIG_MTRR
69 #include <asm/mtrr.h>
70 #endif
71
72 #include <video/fbcon.h>
73 #include <video/fbcon-cfb16.h>
74 #include <video/fbcon-cfb24.h>
75 #include <video/fbcon-cfb32.h>
76
77 #ifdef CONFIG_FB_PVR2_DEBUG
78 # define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
79 #else
80 # define DPRINTK(fmt, args...)
81 #endif
82
83 /* 2D video registers */
84 #define DISP_BASE 0xa05f8000
85
86 #define DISP_BRDRCOLR (DISP_BASE + 0x40)
87 #define DISP_DIWMODE (DISP_BASE + 0x44)
88 #define DISP_DIWADDRL (DISP_BASE + 0x50)
89 #define DISP_DIWADDRS (DISP_BASE + 0x54)
90 #define DISP_DIWSIZE (DISP_BASE + 0x5c)
91 #define DISP_SYNCCONF (DISP_BASE + 0xd0)
92 #define DISP_BRDRHORZ (DISP_BASE + 0xd4)
93 #define DISP_SYNCSIZE (DISP_BASE + 0xd8)
94 #define DISP_BRDRVERT (DISP_BASE + 0xdc)
95 #define DISP_DIWCONF (DISP_BASE + 0xe8)
96 #define DISP_DIWHSTRT (DISP_BASE + 0xec)
97 #define DISP_DIWVSTRT (DISP_BASE + 0xf0)
98
99 /* Pixel clocks, one for TV output, doubled for VGA output */
100 #define TV_CLK 74239
101 #define VGA_CLK 37119
102
103 /* This is for 60Hz - the VTOTAL is doubled for interlaced modes */
104 #define PAL_HTOTAL 863
105 #define PAL_VTOTAL 312
106 #define NTSC_HTOTAL 857
107 #define NTSC_VTOTAL 262
108
109 enum { CT_VGA, CT_NONE, CT_RGB, CT_COMPOSITE };
110
111 enum { VO_PAL, VO_NTSC, VO_VGA };
112
113 struct pvr2_params { u_short val; char *name; };
114 static struct pvr2_params cables[] __initdata = {
115 { CT_VGA, "VGA" }, { CT_RGB, "RGB" }, { CT_COMPOSITE, "COMPOSITE" },
116 };
117
118 static struct pvr2_params outputs[] __initdata = {
119 { VO_PAL, "PAL" }, { VO_NTSC, "NTSC" }, { VO_VGA, "VGA" },
120 };
121
122 /*
123 * This describes the current video mode
124 */
125
126 static struct pvr2fb_par {
127
128 int xres;
129 int yres;
130 int vxres;
131 int vyres;
132 int xoffset;
133 int yoffset;
134 u_short bpp;
135
136 u_long pixclock;
137 u_short hsync_total; /* Clocks/line */
138 u_short vsync_total; /* Lines/field */
139 u_short borderstart_h;
140 u_short borderstop_h;
141 u_short borderstart_v;
142 u_short borderstop_v;
143 u_short diwstart_h; /* Horizontal offset of the display field */
144 u_short diwstart_v; /* Vertical offset of the display field, for
145 interlaced modes, this is the long field */
146 u_long disp_start; /* Address of image within VRAM */
147
148 u_long next_line; /* Modulo for next line */
149
150 u_char is_interlaced; /* Is the display interlaced? */
151 u_char is_doublescan; /* Are scanlines output twice? (doublescan) */
152 u_char is_lowres; /* Is horizontal pixel-doubling enabled? */
153
154 u_long bordercolor; /* RGB888 format border color */
155
156 u_long vmode;
157
158 } currentpar;
159
160 static int currcon = 0;
161 static int currbpp;
162 static struct display disp;
163 static struct fb_info fb_info;
164 static int pvr2fb_inverse = 0;
165
166 static struct { u_short red, green, blue, alpha; } palette[256];
167 static union {
168 #ifdef FBCON_HAS_CFB16
169 u16 cfb16[16];
170 #endif
171 #ifdef FBCON_HAS_CFB24
172 u32 cfb24[16];
173 #endif
174 #ifdef FBCON_HAS_CFB32
175 u32 cfb32[16];
176 #endif
177 } fbcon_cmap;
178
179 static char pvr2fb_name[16] = "NEC PowerVR2";
180
181 #define VIDEOMEMSIZE (8*1024*1024)
182 static u_long videomemory = 0xa5000000, videomemorysize = VIDEOMEMSIZE;
183 static int cable_type = -1;
184 static int video_output = -1;
185
186 #ifdef CONFIG_MTRR
187 static int enable_mtrr = 1;
188 static int mtrr_handle;
189 #endif
190
191 /*
192 * We do all updating, blanking, etc. during the vertical retrace period
193 */
194
195 static u_short do_vmode_full = 0; /* Change the video mode */
196 static u_short do_vmode_pan = 0; /* Update the video mode */
197 static short do_blank = 0; /* (Un)Blank the screen */
198
199 static u_short is_blanked = 0; /* Is the screen blanked? */
200
201 /* Interface used by the world */
202
203 int pvr2fb_setup(char*);
204
205 static int pvr2fb_get_fix(struct fb_fix_screeninfo *fix, int con,
206 struct fb_info *info);
207 static int pvr2fb_get_var(struct fb_var_screeninfo *var, int con,
208 struct fb_info *info);
209 static int pvr2fb_set_var(struct fb_var_screeninfo *var, int con,
210 struct fb_info *info);
211 static int pvr2fb_pan_display(struct fb_var_screeninfo *var, int con,
212 struct fb_info *info);
213 static int pvr2fb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
214 struct fb_info *info);
215 static int pvr2fb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
216 struct fb_info *info);
217
218 /*
219 * Interface to the low level console driver
220 */
221
222 static int pvr2fbcon_switch(int con, struct fb_info *info);
223 static int pvr2fbcon_updatevar(int con, struct fb_info *info);
224 static void pvr2fbcon_blank(int blank, struct fb_info *info);
225
226 /*
227 * Internal/hardware-specific routines
228 */
229
230 static void do_install_cmap(int con, struct fb_info *info);
231 static u_long get_line_length(int xres_virtual, int bpp);
232 static void set_color_bitfields(struct fb_var_screeninfo *var);
233 static int pvr2_getcolreg(u_int regno, u_int *red, u_int *green, u_int *blue,
234 u_int *transp, struct fb_info *info);
235 static int pvr2_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
236 u_int transp, struct fb_info *info);
237
238 static int pvr2_encode_fix(struct fb_fix_screeninfo *fix,
239 struct pvr2fb_par *par);
240 static int pvr2_decode_var(struct fb_var_screeninfo *var,
241 struct pvr2fb_par *par);
242 static int pvr2_encode_var(struct fb_var_screeninfo *var,
243 struct pvr2fb_par *par);
244 static void pvr2_get_par(struct pvr2fb_par *par);
245 static void pvr2_set_var(struct fb_var_screeninfo *var);
246 static void pvr2_pan_var(struct fb_var_screeninfo *var);
247 static int pvr2_update_par(void);
248 static void pvr2_update_display(void);
249 static void pvr2_init_display(void);
250 static void pvr2_do_blank(void);
251 static void pvr2fb_interrupt(int irq, void *dev_id, struct pt_regs *fp);
252 static int pvr2_init_cable(void);
253 static int pvr2_get_param(const struct pvr2_params *p, const char *s,
254 int val, int size);
255
256 static struct fb_ops pvr2fb_ops = {
257 owner: THIS_MODULE,
258 fb_get_fix: pvr2fb_get_fix,
259 fb_get_var: pvr2fb_get_var,
260 fb_set_var: pvr2fb_set_var,
261 fb_get_cmap: pvr2fb_get_cmap,
262 fb_set_cmap: pvr2fb_set_cmap,
263 fb_pan_display: pvr2fb_pan_display,
264 };
265
266 static struct fb_videomode pvr2_modedb[] __initdata = {
267
268 /*
269 * Broadcast video modes (PAL and NTSC). I'm unfamiliar with
270 * PAL-M and PAL-N, but from what I've read both modes parallel PAL and
271 * NTSC, so it shouldn't be a problem (I hope).
272 */
273
274 {
275 /* 640x480 @ 60Hz interlaced (NTSC) */
276 "ntsc_640x480i", 60, 640, 480, TV_CLK, 38, 33, 0, 18, 146, 26,
277 FB_SYNC_BROADCAST, FB_VMODE_INTERLACED | FB_VMODE_YWRAP
278 },
279
280 {
281 /* 640x240 @ 60Hz (NTSC) */
282 /* XXX: Broken! Don't use... */
283 "ntsc_640x240", 60, 640, 240, TV_CLK, 38, 33, 0, 0, 146, 22,
284 FB_SYNC_BROADCAST, FB_VMODE_YWRAP
285 },
286
287 {
288 /* 640x480 @ 60hz (VGA) */
289 "vga_640x480", 60, 640, 480, 38, 33, 0, 18, 146, 26,
290 0, FB_VMODE_YWRAP
291 },
292
293 };
294
295 #define NUM_TOTAL_MODES ARRAY_SIZE(pvr2_modedb)
296
297 #define DEFMODE_NTSC 0
298 #define DEFMODE_PAL 0
299 #define DEFMODE_VGA 2
300
301 static int defmode = DEFMODE_NTSC;
302 static char *mode_option __initdata = NULL;
303
304 /* Get the fixed part of the display */
305
306 static int pvr2fb_get_fix(struct fb_fix_screeninfo *fix, int con,
307 struct fb_info *info)
308 {
309 struct pvr2fb_par par;
310
311 if (con == -1)
312 pvr2_get_par(&par);
313 else {
314 int err;
315
316 if ((err = pvr2_decode_var(&fb_display[con].var, &par)))
317 return err;
318 }
319 return pvr2_encode_fix(fix, &par);
320 }
321
322 /* Get the user-defined part of the display */
323
324 static int pvr2fb_get_var(struct fb_var_screeninfo *var, int con,
325 struct fb_info *info)
326 {
327 int err = 0;
328
329 if (con == -1) {
330 struct pvr2fb_par par;
331
332 pvr2_get_par(&par);
333 err = pvr2_encode_var(var, &par);
334 } else
335 *var = fb_display[con].var;
336
337 return err;
338 }
339
340 /* Set the user-defined part of the display */
341
342 static int pvr2fb_set_var(struct fb_var_screeninfo *var, int con,
343 struct fb_info *info)
344 {
345 int err, activate = var->activate;
346 int oldxres, oldyres, oldvxres, oldvyres, oldbpp;
347 struct pvr2fb_par par;
348
349 struct display *display;
350 if (con >= 0)
351 display = &fb_display[con];
352 else
353 display = &disp; /* used during initialization */
354
355 /*
356 * FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal!
357 * as FB_VMODE_SMOOTH_XPAN is only used internally
358 */
359
360 if (var->vmode & FB_VMODE_CONUPDATE) {
361 var->vmode |= FB_VMODE_YWRAP;
362 var->xoffset = display->var.xoffset;
363 var->yoffset = display->var.yoffset;
364 }
365 if ((err = pvr2_decode_var(var, &par)))
366 return err;
367 pvr2_encode_var(var, &par);
368
369 /* Do memory check and bitfield set here?? */
370
371 if ((activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
372 oldxres = display->var.xres;
373 oldyres = display->var.yres;
374 oldvxres = display->var.xres_virtual;
375 oldvyres = display->var.yres_virtual;
376 oldbpp = display->var.bits_per_pixel;
377 display->var = *var;
378 if (oldxres != var->xres || oldyres != var->yres ||
379 oldvxres != var->xres_virtual || oldvyres != var->yres_virtual ||
380 oldbpp != var->bits_per_pixel) {
381 struct fb_fix_screeninfo fix;
382
383 pvr2_encode_fix(&fix, &par);
384 display->screen_base = (char *)fix.smem_start;
385 display->visual = fix.visual;
386 display->type = fix.type;
387 display->type_aux = fix.type_aux;
388 display->ypanstep = fix.ypanstep;
389 display->ywrapstep = fix.ywrapstep;
390 display->line_length = fix.line_length;
391 display->can_soft_blank = 1;
392 display->inverse = pvr2fb_inverse;
393 switch (var->bits_per_pixel) {
394 #ifdef FBCON_HAS_CFB16
395 case 16:
396 display->dispsw = &fbcon_cfb16;
397 display->dispsw_data = fbcon_cmap.cfb16;
398 break;
399 #endif
400 #ifdef FBCON_HAS_CFB24
401 case 24:
402 display->dispsw = &fbcon_cfb24;
403 display->dispsw_data = fbcon_cmap.cfb24;
404 break;
405 #endif
406 #ifdef FBCON_HAS_CFB32
407 case 32:
408 display->dispsw = &fbcon_cfb32;
409 display->dispsw_data = fbcon_cmap.cfb32;
410 break;
411 #endif
412 default:
413 display->dispsw = &fbcon_dummy;
414 break;
415 }
416 if (fb_info.changevar)
417 (*fb_info.changevar)(con);
418 }
419 if (oldbpp != var->bits_per_pixel) {
420 if ((err = fb_alloc_cmap(&display->cmap, 0, 0)))
421 return err;
422 do_install_cmap(con, info);
423 }
424 if (con == currcon)
425 pvr2_set_var(&display->var);
426 }
427
428 return 0;
429 }
430
431 /*
432 * Pan or wrap the display.
433 * This call looks only at xoffset, yoffset and the FB_VMODE_YRAP flag
434 */
435
436 static int pvr2fb_pan_display(struct fb_var_screeninfo *var, int con,
437 struct fb_info *info)
438 {
439 if (var->vmode & FB_VMODE_YWRAP) {
440 if (var->yoffset<0 || var->yoffset >=
441 fb_display[con].var.yres_virtual || var->xoffset)
442 return -EINVAL;
443 } else {
444 if (var->xoffset+fb_display[con].var.xres >
445 fb_display[con].var.xres_virtual ||
446 var->yoffset+fb_display[con].var.yres >
447 fb_display[con].var.yres_virtual)
448 return -EINVAL;
449 }
450 if (con == currcon)
451 pvr2_pan_var(var);
452 fb_display[con].var.xoffset = var->xoffset;
453 fb_display[con].var.yoffset = var->yoffset;
454 if (var->vmode & FB_VMODE_YWRAP)
455 fb_display[con].var.vmode |= FB_VMODE_YWRAP;
456 else
457 fb_display[con].var.vmode &= ~FB_VMODE_YWRAP;
458
459 return 0;
460 }
461
462 /* Get the colormap */
463
464 static int pvr2fb_get_cmap(struct fb_cmap *cmap, int kspc, int con,
465 struct fb_info *info)
466 {
467 if (con == currcon) /* current console? */
468 return fb_get_cmap(cmap, kspc, pvr2_getcolreg, info);
469 else if (fb_display[con].cmap.len) /* non default colormap? */
470 fb_copy_cmap(&fb_display[con].cmap, cmap, kspc ? 0 : 2);
471 else
472 fb_copy_cmap(fb_default_cmap(1<<fb_display[con].var.bits_per_pixel),
473 cmap, kspc ? 0 : 2);
474 return 0;
475 }
476
477 /* Set the colormap */
478
479 static int pvr2fb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
480 struct fb_info *info)
481 {
482 int err;
483
484 if (!fb_display[con].cmap.len) { /* no colormap allocated? */
485 if ((err = fb_alloc_cmap(&fb_display[con].cmap,
486 1<<fb_display[con].var.bits_per_pixel,
487 0)))
488 return err;
489 }
490 if (con == currcon) /* current console? */
491 return fb_set_cmap(cmap, kspc, pvr2_setcolreg, info);
492 else
493 fb_copy_cmap(cmap, &fb_display[con].cmap, kspc ? 0 : 1);
494
495 return 0;
496 }
497
498 static int pvr2fbcon_switch(int con, struct fb_info *info)
499 {
500 /* Do we have to save the colormap? */
501 if (fb_display[currcon].cmap.len)
502 fb_get_cmap(&fb_display[currcon].cmap, 1, pvr2_getcolreg, info);
503
504 currcon = con;
505 pvr2_set_var(&fb_display[con].var);
506 /* Install new colormap */
507 do_install_cmap(con, info);
508 return 0;
509 }
510
511 static int pvr2fbcon_updatevar(int con, struct fb_info *info)
512 {
513 pvr2_pan_var(&fb_display[con].var);
514 return 0;
515 }
516
517 static void pvr2fbcon_blank(int blank, struct fb_info *info)
518 {
519 do_blank = blank ? blank : -1;
520 }
521
522 /* Setup the colormap */
523
524 static void do_install_cmap(int con, struct fb_info *info)
525 {
526 if (con != currcon)
527 return;
528 if (fb_display[con].cmap.len)
529 fb_set_cmap(&fb_display[con].cmap, 1, pvr2_setcolreg, info);
530 else
531 fb_set_cmap(fb_default_cmap(1<<fb_display[con].var.bits_per_pixel),
532 1, pvr2_setcolreg, info);
533 }
534
535 static inline u_long get_line_length(int xres_virtual, int bpp)
536 {
537 return (u_long)((((xres_virtual*bpp)+31)&~31) >> 3);
538 }
539
540 static void set_color_bitfields(struct fb_var_screeninfo *var)
541 {
542 switch (var->bits_per_pixel) {
543 case 16: /* RGB 565 */
544 var->red.offset = 11; var->red.length = 5;
545 var->green.offset = 5; var->green.length = 6;
546 var->blue.offset = 0; var->blue.length = 5;
547 var->transp.offset = 0; var->transp.length = 0;
548 break;
549 case 24: /* RGB 888 */
550 var->red.offset = 16; var->red.length = 8;
551 var->green.offset = 8; var->green.length = 8;
552 var->blue.offset = 0; var->blue.length = 8;
553 var->transp.offset = 0; var->transp.length = 0;
554 break;
555 case 32: /* ARGB 8888 */
556 var->red.offset = 16; var->red.length = 8;
557 var->green.offset = 8; var->green.length = 8;
558 var->blue.offset = 0; var->blue.length = 8;
559 var->transp.offset = 24; var->transp.length = 8;
560 break;
561 }
562 }
563
564 static int pvr2_getcolreg(u_int regno, u_int *red, u_int *green, u_int *blue,
565 u_int *transp, struct fb_info *info)
566 {
567 if (regno > 255)
568 return 1;
569
570 *red = palette[regno].red;
571 *green = palette[regno].green;
572 *blue = palette[regno].blue;
573 *transp = 0;
574 return 0;
575 }
576
577 static int pvr2_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
578 u_int transp, struct fb_info *info)
579 {
580 if (regno > 255)
581 return 1;
582
583 palette[regno].red = red;
584 palette[regno].green = green;
585 palette[regno].blue = blue;
586
587 if (regno < 16) {
588 switch (currbpp) {
589 #ifdef FBCON_HAS_CFB16
590 case 16: /* RGB 565 */
591 fbcon_cmap.cfb16[regno] = (red & 0xf800) |
592 ((green & 0xf800) >> 6) |
593 ((blue & 0xf800) >> 11);
594 break;
595 #endif
596 #ifdef FBCON_HAS_CFB24
597 case 24: /* RGB 888 */
598 red >>= 8; green >>= 8; blue >>= 8;
599 fbcon_cmap.cfb24[regno] = (red << 16) | (green << 8) | blue;
600 break;
601 #endif
602 #ifdef FBCON_HAS_CFB32
603 case 32: /* ARGB 8888 */
604 red >>= 8; green >>= 8; blue >>= 8;
605 fbcon_cmap.cfb32[regno] = (red << 16) | (green << 8) | blue;
606 break;
607 #endif
608 default:
609 DPRINTK("Invalid bit depth %d?!?\n", currbpp);
610 return 1;
611 }
612 }
613
614 return 0;
615 }
616
617
618 static int pvr2_encode_fix(struct fb_fix_screeninfo *fix,
619 struct pvr2fb_par *par)
620 {
621 memset(fix, 0, sizeof(struct fb_fix_screeninfo));
622 strcpy(fix->id, pvr2fb_name);
623 fix->smem_start = videomemory;
624 fix->smem_len = videomemorysize;
625 fix->type = FB_TYPE_PACKED_PIXELS;
626 fix->type_aux = 0;
627 fix->visual = FB_VISUAL_TRUECOLOR;
628
629 if (par->vmode & FB_VMODE_YWRAP) {
630 fix->ywrapstep = 1;
631 fix->xpanstep = fix->ypanstep = 0;
632 } else {
633 fix->ywrapstep = 0;
634 fix->xpanstep = 1;
635 fix->ypanstep = 1;
636 }
637 fix->line_length = par->next_line;
638
639 return 0;
640 }
641
642 /*
643 * Create a hardware video mode using the framebuffer values. If a value needs
644 * to be clipped or constrained it's done here. This routine needs a bit more
645 * work to make sure we're doing the right tests at the right time.
646 */
647 static int pvr2_decode_var(struct fb_var_screeninfo *var,
648 struct pvr2fb_par *par)
649 {
650 u_long line_length;
651 u_short vtotal;
652
653 if (var->pixclock != TV_CLK && var->pixclock != VGA_CLK) {
654 DPRINTK("Invalid pixclock value %d\n", var->pixclock);
655 return -EINVAL;
656 }
657 par->pixclock = var->pixclock;
658
659 if ((par->xres = var->xres) < 320)
660 par->xres = 320;
661 if ((par->yres = var->yres) < 240)
662 par->yres = 240;
663 if ((par->vxres = var->xres_virtual) < par->xres)
664 par->vxres = par->xres;
665 if ((par->vyres = var->yres_virtual) < par->yres)
666 par->vyres = par->yres;
667
668 if ((par->bpp = var->bits_per_pixel) <= 16)
669 par->bpp = 16;
670 else if ((par->bpp = var->bits_per_pixel) <= 24)
671 par->bpp = 24;
672 else if ((par->bpp = var->bits_per_pixel) <= 32)
673 par->bpp = 32;
674
675 currbpp = par->bpp;
676
677 /*
678 * XXX: It's possible that a user could use a VGA box, change the cable
679 * type in hardware (i.e. switch from VGA<->composite), then change modes
680 * (i.e. switching to another VT). If that happens we should automagically
681 * change the output format to cope, but currently I don't have a VGA box
682 * to make sure this works properly.
683 */
684 cable_type = pvr2_init_cable();
685 if (cable_type == CT_VGA && video_output != VO_VGA)
686 video_output = VO_VGA;
687
688 par->vmode = var->vmode & FB_VMODE_MASK;
689 if (par->vmode & FB_VMODE_INTERLACED && video_output != VO_VGA)
690 par->is_interlaced = 1;
691 /*
692 * XXX: Need to be more creative with this (i.e. allow doublecan for
693 * PAL/NTSC output).
694 */
695 par->is_doublescan = (par->yres < 480 && video_output == VO_VGA);
696
697 par->hsync_total = var->left_margin + var->xres + var->right_margin +
698 var->hsync_len;
699 par->vsync_total = var->upper_margin + var->yres + var->lower_margin +
700 var->vsync_len;
701
702 if (var->sync & FB_SYNC_BROADCAST) {
703 vtotal = par->vsync_total;
704 if (par->is_interlaced)
705 vtotal /= 2;
706 if (vtotal > (PAL_VTOTAL + NTSC_VTOTAL)/2) {
707 /* PAL video output */
708 /* XXX: Should be using a range here ... ? */
709 if (par->hsync_total != PAL_HTOTAL) {
710 DPRINTK("invalid hsync total for PAL\n");
711 return -EINVAL;
712 }
713 /* XXX: Check for start values here... */
714 /* XXX: Check hardware for PAL-compatibility */
715 par->borderstart_h = 116;
716 par->borderstart_v = 44;
717 } else {
718 /* NTSC video output */
719 if (par->hsync_total != NTSC_HTOTAL) {
720 DPRINTK("invalid hsync total for NTSC\n");
721 return -EINVAL;
722 }
723 par->borderstart_h = 126;
724 par->borderstart_v = 18;
725 }
726 } else {
727 /* VGA mode */
728 /* XXX: What else needs to be checked? */
729 /*
730 * XXX: We have a little freedom in VGA modes, what ranges should
731 * be here (i.e. hsync/vsync totals, etc.)?
732 */
733 par->borderstart_h = 126;
734 par->borderstart_v = 40;
735 }
736
737 /* Calculate the remainding offsets */
738 par->borderstop_h = par->borderstart_h + par->hsync_total -
739 var->hsync_len;
740 par->borderstop_v = par->borderstart_v + par->vsync_total -
741 var->vsync_len;
742 par->diwstart_h = par->borderstart_h + var->left_margin;
743 par->diwstart_v = par->borderstart_v + var->upper_margin;
744 if (!par->is_interlaced)
745 par->borderstop_v /= 2;
746
747 if (par->xres < 640)
748 par->is_lowres = 1;
749
750 /* XXX: Needs testing. */
751 if (!((par->vmode ^ var->vmode) & FB_VMODE_YWRAP)) {
752 par->xoffset = var->xoffset;
753 par->yoffset = var->yoffset;
754 if (par->vmode & FB_VMODE_YWRAP) {
755 if (par->xoffset || par->yoffset < 0 || par->yoffset >=
756 par->vyres)
757 par->xoffset = par->yoffset = 0;
758 } else {
759 if (par->xoffset < 0 || par->xoffset > par->vxres-par->xres ||
760 par->yoffset < 0 || par->yoffset > par->vyres-par->yres)
761 par->xoffset = par->yoffset = 0;
762 }
763 } else
764 par->xoffset = par->yoffset = 0;
765
766 /* Check memory sizes */
767 line_length = get_line_length(var->xres_virtual, var->bits_per_pixel);
768 if (line_length * var->yres_virtual > videomemorysize)
769 return -ENOMEM;
770 par->disp_start = videomemory + (get_line_length(par->vxres, par->bpp) *
771 par->yoffset) * get_line_length(par->xoffset, par->bpp);
772 par->next_line = line_length;
773
774 return 0;
775 }
776
777 static int pvr2_encode_var(struct fb_var_screeninfo *var,
778 struct pvr2fb_par *par)
779 {
780 memset(var, 0, sizeof(struct fb_var_screeninfo));
781
782 var->xres = par->xres;
783 var->yres = par->yres;
784 var->xres_virtual = par->vxres;
785 var->yres_virtual = par->vyres;
786 var->xoffset = par->xoffset;
787 var->yoffset = par->yoffset;
788
789 var->bits_per_pixel = par->bpp;
790 set_color_bitfields(var);
791
792 var->activate = FB_ACTIVATE_NOW;
793 var->height = -1;
794 var->width = -1;
795
796 var->pixclock = par->pixclock;
797
798 if (par->is_doublescan)
799 var->vmode = FB_VMODE_DOUBLE;
800
801 if (par->is_interlaced)
802 var->vmode |= FB_VMODE_INTERLACED;
803 else
804 var->vmode |= FB_VMODE_NONINTERLACED;
805
806 var->right_margin = par->borderstop_h - (par->diwstart_h + par->xres);
807 var->left_margin = par->diwstart_h - par->borderstart_h;
808 var->hsync_len = par->borderstart_h + (par->hsync_total - par->borderstop_h);
809 var->upper_margin = par->diwstart_v - par->borderstart_v;
810 var->lower_margin = par->borderstop_v - (par->diwstart_v + par->yres);
811 var->vsync_len = par->borderstart_v + (par->vsync_total - par->borderstop_v);
812 if (video_output != VO_VGA)
813 var->sync = FB_SYNC_BROADCAST;
814
815 if (par->vmode & FB_VMODE_YWRAP)
816 var->vmode |= FB_VMODE_YWRAP;
817
818 return 0;
819 }
820
821 static void pvr2_get_par(struct pvr2fb_par *par)
822 {
823 *par = currentpar;
824 }
825
826 /* Setup the new videomode in hardware */
827
828 static void pvr2_set_var(struct fb_var_screeninfo *var)
829 {
830 do_vmode_pan = 0;
831 do_vmode_full = 0;
832 pvr2_decode_var(var, ¤tpar);
833
834 do_vmode_full = 1;
835 }
836
837 /*
838 * Pan or wrap the display
839 * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag in `var'.
840 */
841 static void pvr2_pan_var(struct fb_var_screeninfo *var)
842 {
843 struct pvr2fb_par *par = ¤tpar;
844
845 par->xoffset = var->xoffset;
846 par->yoffset = var->yoffset;
847 if (var->vmode & FB_VMODE_YWRAP)
848 par->vmode |= FB_VMODE_YWRAP;
849 else
850 par->vmode &= ~FB_VMODE_YWRAP;
851
852 do_vmode_pan = 0;
853 pvr2_update_par();
854 do_vmode_pan = 1;
855 }
856
857 static int pvr2_update_par(void)
858 {
859 struct pvr2fb_par *par = ¤tpar;
860 u_long move;
861
862 move = get_line_length(par->xoffset, par->bpp);
863 if (par->yoffset) {
864 par->disp_start += (par->next_line * par->yoffset) + move;
865 } else
866 par->disp_start += move;
867
868 return 0;
869 }
870
871 static void pvr2_update_display(void)
872 {
873 struct pvr2fb_par *par = ¤tpar;
874
875 /* Update the start address of the display image */
876 ctrl_outl(par->disp_start, DISP_DIWADDRL);
877 ctrl_outl(par->disp_start +
878 get_line_length(par->xoffset + par->xres, par->bpp),
879 DISP_DIWADDRS);
880 }
881
882 /*
883 * Initialize the video mode. Currently, the 16bpp and 24bpp modes aren't
884 * very stable. It's probably due to the fact that a lot of the 2D video
885 * registers are still undocumented.
886 */
887
888 static void pvr2_init_display(void)
889 {
890 struct pvr2fb_par *par = ¤tpar;
891 u_short diw_height, diw_width, diw_modulo = 1;
892 u_short bytesperpixel = par->bpp / 8;
893
894 /* hsync and vsync totals */
895 ctrl_outl((par->vsync_total << 16) | par->hsync_total, DISP_SYNCSIZE);
896
897 /* column height, modulo, row width */
898 /* since we're "panning" within vram, we need to offset things based
899 * on the offset from the virtual x start to our real gfx. */
900 if (video_output != VO_VGA && par->is_interlaced)
901 diw_modulo += par->next_line / 4;
902 diw_height = (par->is_interlaced ? par->yres / 2 : par->yres);
903 diw_width = get_line_length(par->xres, par->bpp) / 4;
904 ctrl_outl((diw_modulo << 20) | (--diw_height << 10) | --diw_width,
905 DISP_DIWSIZE);
906
907 /* display address, long and short fields */
908 ctrl_outl(par->disp_start, DISP_DIWADDRL);
909 ctrl_outl(par->disp_start +
910 get_line_length(par->xoffset + par->xres, par->bpp),
911 DISP_DIWADDRS);
912
913 /* border horizontal, border vertical, border color */
914 ctrl_outl((par->borderstart_h << 16) | par->borderstop_h, DISP_BRDRHORZ);
915 ctrl_outl((par->borderstart_v << 16) | par->borderstop_v, DISP_BRDRVERT);
916 ctrl_outl(0, DISP_BRDRCOLR);
917
918 /* display window start position */
919 ctrl_outl(par->diwstart_h, DISP_DIWHSTRT);
920 ctrl_outl((par->diwstart_v << 16) | par->diwstart_v, DISP_DIWVSTRT);
921
922 /* misc. settings */
923 ctrl_outl((0x16 << 16) | par->is_lowres, DISP_DIWCONF);
924
925 /* clock doubler (for VGA), scan doubler, display enable */
926 ctrl_outl(((video_output == VO_VGA) << 23) |
927 (par->is_doublescan << 1) | 1, DISP_DIWMODE);
928
929 /* bits per pixel */
930 ctrl_outl(ctrl_inl(DISP_DIWMODE) | (--bytesperpixel << 2), DISP_DIWMODE);
931
932 /* video enable, color sync, interlace,
933 * hsync and vsync polarity (currently unused) */
934 ctrl_outl(0x100 | ((par->is_interlaced /*|4*/) << 4), DISP_SYNCCONF);
935
936 }
937
938 /* Simulate blanking by making the border cover the entire screen */
939
940 #define BLANK_BIT (1<<3)
941
942 static void pvr2_do_blank(void)
943 {
944 u_long diwconf;
945
946 diwconf = ctrl_inl(DISP_DIWCONF);
947 if (do_blank > 0)
948 ctrl_outl(diwconf | BLANK_BIT, DISP_DIWCONF);
949 else
950 ctrl_outl(diwconf & ~BLANK_BIT, DISP_DIWCONF);
951
952 is_blanked = do_blank > 0 ? do_blank : 0;
953 }
954
955 static void pvr2fb_interrupt(int irq, void *dev_id, struct pt_regs *fp)
956 {
957 if (do_vmode_pan || do_vmode_full)
958 pvr2_update_display();
959
960 if (do_vmode_full)
961 pvr2_init_display();
962
963 if (do_vmode_pan)
964 do_vmode_pan = 0;
965
966 if (do_blank) {
967 pvr2_do_blank();
968 do_blank = 0;
969 }
970
971 if (do_vmode_full) {
972 do_vmode_full = 0;
973 }
974 }
975
976 /*
977 * Determine the cable type and initialize the cable output format. Don't do
978 * anything if the cable type has been overidden (via "cable:XX").
979 */
980
981 #define PCTRA 0xff80002c
982 #define PDTRA 0xff800030
983 #define VOUTC 0xa0702c00
984
985 static int pvr2_init_cable(void)
986 {
987 if (cable_type < 0) {
988 ctrl_outl((ctrl_inl(PCTRA) & 0xfff0ffff) | 0x000a0000,
989 PCTRA);
990 cable_type = (ctrl_inw(PDTRA) >> 8) & 3;
991 }
992
993 /* Now select the output format (either composite or other) */
994 /* XXX: Save the previous val first, as this reg is also AICA
995 related */
996 if (cable_type == CT_COMPOSITE)
997 ctrl_outl(3 << 8, VOUTC);
998 else
999 ctrl_outl(0, VOUTC);
1000
1001 return cable_type;
1002 }
1003
1004 int __init pvr2fb_init(void)
1005 {
1006 struct fb_var_screeninfo var;
1007 u_long modememused;
1008
1009 if (!MACH_DREAMCAST)
1010 return -ENXIO;
1011
1012 /* Make a guess at the monitor based on the attached cable */
1013 if (pvr2_init_cable() == CT_VGA) {
1014 fb_info.monspecs.hfmin = 30000;
1015 fb_info.monspecs.hfmax = 70000;
1016 fb_info.monspecs.vfmin = 60;
1017 fb_info.monspecs.vfmax = 60;
1018 }
1019 else { /* Not VGA, using a TV (taken from acornfb) */
1020 fb_info.monspecs.hfmin = 15469;
1021 fb_info.monspecs.hfmax = 15781;
1022 fb_info.monspecs.vfmin = 49;
1023 fb_info.monspecs.vfmax = 51;
1024 }
1025
1026 /* XXX: This needs to pull default video output via BIOS or other means */
1027 if (video_output < 0) {
1028 if (cable_type == CT_VGA)
1029 video_output = VO_VGA;
1030 else
1031 video_output = VO_NTSC;
1032 }
1033
1034 strcpy(fb_info.modename, pvr2fb_name);
1035 fb_info.changevar = NULL;
1036 fb_info.node = -1;
1037 fb_info.fbops = &pvr2fb_ops;
1038 fb_info.disp = &disp;
1039 fb_info.switch_con = &pvr2fbcon_switch;
1040 fb_info.updatevar = &pvr2fbcon_updatevar;
1041 fb_info.blank = &pvr2fbcon_blank;
1042 fb_info.flags = FBINFO_FLAG_DEFAULT;
1043 memset(&var, 0, sizeof(var));
1044
1045 if (video_output == VO_VGA)
1046 defmode = DEFMODE_VGA;
1047
1048 if (!fb_find_mode(&var, &fb_info, mode_option, pvr2_modedb,
1049 NUM_TOTAL_MODES, &pvr2_modedb[defmode], 16)) {
1050 return -EINVAL;
1051 }
1052
1053 if (request_irq(HW_EVENT_VSYNC, pvr2fb_interrupt, 0,
1054 "pvr2 VBL handler", ¤tpar)) {
1055 DPRINTK("couldn't register VBL int\n");
1056 return -EBUSY;
1057 }
1058
1059 #ifdef CONFIG_MTRR
1060 if (enable_mtrr) {
1061 mtrr_handle = mtrr_add(videomemory, videomemorysize, MTRR_TYPE_WRCOMB, 1);
1062 printk("pvr2fb: MTRR turned on\n");
1063 }
1064 #endif
1065
1066 pvr2fb_set_var(&var, -1, &fb_info);
1067
1068 if (register_framebuffer(&fb_info) < 0)
1069 return -EINVAL;
1070
1071 modememused = get_line_length(var.xres_virtual, var.bits_per_pixel);
1072 modememused *= var.yres_virtual;
1073 printk("fb%d: %s frame buffer device, using %ldk/%ldk of video memory\n",
1074 GET_FB_IDX(fb_info.node), fb_info.modename, modememused>>10,
1075 videomemorysize>>10);
1076 printk("fb%d: Mode %dx%d-%d pitch = %ld cable: %s video output: %s\n",
1077 GET_FB_IDX(fb_info.node), var.xres, var.yres, var.bits_per_pixel,
1078 get_line_length(var.xres, var.bits_per_pixel),
1079 (char *)pvr2_get_param(cables, NULL, cable_type, 6),
1080 (char *)pvr2_get_param(outputs, NULL, video_output, 6));
1081
1082 return 0;
1083 }
1084
1085 static void __exit pvr2fb_exit(void)
1086 {
1087 #ifdef CONFIG_MTRR
1088 if (enable_mtrr) {
1089 mtrr_del(mtrr_handle, videomemory, videomemorysize);
1090 printk("pvr2fb: MTRR turned off\n");
1091 }
1092 #endif
1093 unregister_framebuffer(&fb_info);
1094 }
1095
1096 static int __init pvr2_get_param(const struct pvr2_params *p, const char *s,
1097 int val, int size)
1098 {
1099 int i;
1100
1101 for (i = 0 ; i < size ; i++ ) {
1102 if (s != NULL) {
1103 if (!strnicmp(p[i].name, s, strlen(s)))
1104 return p[i].val;
1105 } else {
1106 if (p[i].val == val)
1107 return (int)p[i].name;
1108 }
1109 }
1110 return -1;
1111 }
1112
1113 /*
1114 * Parse command arguments. Supported arguments are:
1115 * inverse Use inverse color maps
1116 * nomtrr Disable MTRR usage
1117 * font:<fontname> Specify console font
1118 * cable:composite|rgb|vga Override the video cable type
1119 * output:NTSC|PAL|VGA Override the video output format
1120 *
1121 * <xres>x<yres>[-<bpp>][@<refresh>] or,
1122 * <name>[-<bpp>][@<refresh>] Startup using this video mode
1123 */
1124
1125 #ifndef MODULE
1126 int __init pvr2fb_setup(char *options)
1127 {
1128 char *this_opt;
1129 char cable_arg[80];
1130 char output_arg[80];
1131
1132 fb_info.fontname[0] = '\0';
1133
1134 if (!options || !*options)
1135 return 0;
1136
1137 while ((this_opt = strsep(&options, ","))) {
1138 if (!*this_opt)
1139 continue;
1140 if (!strcmp(this_opt, "inverse")) {
1141 pvr2fb_inverse = 1;
1142 fb_invert_cmaps();
1143 } else if (!strncmp(this_opt, "font:", 5))
1144 strcpy(fb_info.fontname, this_opt + 5);
1145 else if (!strncmp(this_opt, "cable:", 6))
1146 strcpy(cable_arg, this_opt + 6);
1147 else if (!strncmp(this_opt, "output:", 7))
1148 strcpy(output_arg, this_opt + 7);
1149 #ifdef CONFIG_MTRR
1150 else if (!strncmp(this_opt, "nomtrr", 6))
1151 enable_mtrr = 0;
1152 #endif
1153 else
1154 mode_option = this_opt;
1155 }
1156
1157 if (*cable_arg)
1158 cable_type = pvr2_get_param(cables, cable_arg, 0, 6);
1159
1160 if (*output_arg)
1161 video_output = pvr2_get_param(outputs, output_arg, 0, 6);
1162
1163 return 0;
1164 }
1165 #endif
1166
1167 #ifdef MODULE
1168 MODULE_LICENSE("GPL");
1169 module_init(pvr2fb_init);
1170 #endif
1171 module_exit(pvr2fb_exit);
1172
1173