1 /*
2 * linux/drivers/video/hgafb.c -- Hercules graphics adaptor frame buffer device
3 *
4 * Created 25 Nov 1999 by Ferenc Bakonyi (fero@drama.obuda.kando.hu)
5 * Based on skeletonfb.c by Geert Uytterhoeven and
6 * mdacon.c by Andrew Apted
7 *
8 * History:
9 *
10 * - Revision 0.1.8 (23 Oct 2002): Ported to new framebuffer api.
11 *
12 * - Revision 0.1.7 (23 Jan 2001): fix crash resulting from MDA only cards
13 * being detected as Hercules. (Paul G.)
14 * - Revision 0.1.6 (17 Aug 2000): new style structs
15 * documentation
16 * - Revision 0.1.5 (13 Mar 2000): spinlocks instead of saveflags();cli();etc
17 * minor fixes
18 * - Revision 0.1.4 (24 Jan 2000): fixed a bug in hga_card_detect() for
19 * HGA-only systems
20 * - Revision 0.1.3 (22 Jan 2000): modified for the new fb_info structure
21 * screen is cleared after rmmod
22 * virtual resolutions
23 * module parameter 'nologo={0|1}'
24 * the most important: boot logo :)
25 * - Revision 0.1.0 (6 Dec 1999): faster scrolling and minor fixes
26 * - First release (25 Nov 1999)
27 *
28 * This file is subject to the terms and conditions of the GNU General Public
29 * License. See the file COPYING in the main directory of this archive
30 * for more details.
31 */
32
33 #include <linux/module.h>
34 #include <linux/kernel.h>
35 #include <linux/errno.h>
36 #include <linux/spinlock.h>
37 #include <linux/string.h>
38 #include <linux/mm.h>
39 #include <linux/slab.h>
40 #include <linux/delay.h>
41 #include <linux/fb.h>
42 #include <linux/init.h>
43 #include <linux/ioport.h>
44 #include <linux/platform_device.h>
45 #include <asm/io.h>
46 #include <asm/vga.h>
47
48 #if 0
49 #define DPRINTK(args...) printk(KERN_DEBUG __FILE__": " ##args)
50 #else
51 #define DPRINTK(args...)
52 #endif
53
54 #if 0
55 #define CHKINFO(ret) if (info != &fb_info) { printk(KERN_DEBUG __FILE__": This should never happen, line:%d \n", __LINE__); return ret; }
56 #else
57 #define CHKINFO(ret)
58 #endif
59
60 /* Description of the hardware layout */
61
62 static void __iomem *hga_vram; /* Base of video memory */
63 static unsigned long hga_vram_len; /* Size of video memory */
64
65 #define HGA_ROWADDR(row) ((row%4)*8192 + (row>>2)*90)
66 #define HGA_TXT 0
67 #define HGA_GFX 1
68
rowaddr(struct fb_info * info,u_int row)69 static inline u8 __iomem * rowaddr(struct fb_info *info, u_int row)
70 {
71 return info->screen_base + HGA_ROWADDR(row);
72 }
73
74 static int hga_mode = -1; /* 0 = txt, 1 = gfx mode */
75
76 static enum { TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } hga_type;
77 static char *hga_type_name;
78
79 #define HGA_INDEX_PORT 0x3b4 /* Register select port */
80 #define HGA_VALUE_PORT 0x3b5 /* Register value port */
81 #define HGA_MODE_PORT 0x3b8 /* Mode control port */
82 #define HGA_STATUS_PORT 0x3ba /* Status and Config port */
83 #define HGA_GFX_PORT 0x3bf /* Graphics control port */
84
85 /* HGA register values */
86
87 #define HGA_CURSOR_BLINKING 0x00
88 #define HGA_CURSOR_OFF 0x20
89 #define HGA_CURSOR_SLOWBLINK 0x60
90
91 #define HGA_MODE_GRAPHICS 0x02
92 #define HGA_MODE_VIDEO_EN 0x08
93 #define HGA_MODE_BLINK_EN 0x20
94 #define HGA_MODE_GFX_PAGE1 0x80
95
96 #define HGA_STATUS_HSYNC 0x01
97 #define HGA_STATUS_VSYNC 0x80
98 #define HGA_STATUS_VIDEO 0x08
99
100 #define HGA_CONFIG_COL132 0x08
101 #define HGA_GFX_MODE_EN 0x01
102 #define HGA_GFX_PAGE_EN 0x02
103
104 /* Global locks */
105
106 static DEFINE_SPINLOCK(hga_reg_lock);
107
108 /* Framebuffer driver structures */
109
110 static struct fb_var_screeninfo __initdata hga_default_var = {
111 .xres = 720,
112 .yres = 348,
113 .xres_virtual = 720,
114 .yres_virtual = 348,
115 .bits_per_pixel = 1,
116 .red = {0, 1, 0},
117 .green = {0, 1, 0},
118 .blue = {0, 1, 0},
119 .transp = {0, 0, 0},
120 .height = -1,
121 .width = -1,
122 };
123
124 static struct fb_fix_screeninfo __initdata hga_fix = {
125 .id = "HGA",
126 .type = FB_TYPE_PACKED_PIXELS, /* (not sure) */
127 .visual = FB_VISUAL_MONO10,
128 .xpanstep = 8,
129 .ypanstep = 8,
130 .line_length = 90,
131 .accel = FB_ACCEL_NONE
132 };
133
134 /* Don't assume that tty1 will be the initial current console. */
135 static int release_io_port = 0;
136 static int release_io_ports = 0;
137 static int nologo = 0;
138
139 /* -------------------------------------------------------------------------
140 *
141 * Low level hardware functions
142 *
143 * ------------------------------------------------------------------------- */
144
write_hga_b(unsigned int val,unsigned char reg)145 static void write_hga_b(unsigned int val, unsigned char reg)
146 {
147 outb_p(reg, HGA_INDEX_PORT);
148 outb_p(val, HGA_VALUE_PORT);
149 }
150
write_hga_w(unsigned int val,unsigned char reg)151 static void write_hga_w(unsigned int val, unsigned char reg)
152 {
153 outb_p(reg, HGA_INDEX_PORT); outb_p(val >> 8, HGA_VALUE_PORT);
154 outb_p(reg+1, HGA_INDEX_PORT); outb_p(val & 0xff, HGA_VALUE_PORT);
155 }
156
test_hga_b(unsigned char val,unsigned char reg)157 static int test_hga_b(unsigned char val, unsigned char reg)
158 {
159 outb_p(reg, HGA_INDEX_PORT);
160 outb (val, HGA_VALUE_PORT);
161 udelay(20); val = (inb_p(HGA_VALUE_PORT) == val);
162 return val;
163 }
164
hga_clear_screen(void)165 static void hga_clear_screen(void)
166 {
167 unsigned char fillchar = 0xbf; /* magic */
168 unsigned long flags;
169
170 spin_lock_irqsave(&hga_reg_lock, flags);
171 if (hga_mode == HGA_TXT)
172 fillchar = ' ';
173 else if (hga_mode == HGA_GFX)
174 fillchar = 0x00;
175 spin_unlock_irqrestore(&hga_reg_lock, flags);
176 if (fillchar != 0xbf)
177 memset_io(hga_vram, fillchar, hga_vram_len);
178 }
179
hga_txt_mode(void)180 static void hga_txt_mode(void)
181 {
182 unsigned long flags;
183
184 spin_lock_irqsave(&hga_reg_lock, flags);
185 outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_BLINK_EN, HGA_MODE_PORT);
186 outb_p(0x00, HGA_GFX_PORT);
187 outb_p(0x00, HGA_STATUS_PORT);
188
189 write_hga_b(0x61, 0x00); /* horizontal total */
190 write_hga_b(0x50, 0x01); /* horizontal displayed */
191 write_hga_b(0x52, 0x02); /* horizontal sync pos */
192 write_hga_b(0x0f, 0x03); /* horizontal sync width */
193
194 write_hga_b(0x19, 0x04); /* vertical total */
195 write_hga_b(0x06, 0x05); /* vertical total adjust */
196 write_hga_b(0x19, 0x06); /* vertical displayed */
197 write_hga_b(0x19, 0x07); /* vertical sync pos */
198
199 write_hga_b(0x02, 0x08); /* interlace mode */
200 write_hga_b(0x0d, 0x09); /* maximum scanline */
201 write_hga_b(0x0c, 0x0a); /* cursor start */
202 write_hga_b(0x0d, 0x0b); /* cursor end */
203
204 write_hga_w(0x0000, 0x0c); /* start address */
205 write_hga_w(0x0000, 0x0e); /* cursor location */
206
207 hga_mode = HGA_TXT;
208 spin_unlock_irqrestore(&hga_reg_lock, flags);
209 }
210
hga_gfx_mode(void)211 static void hga_gfx_mode(void)
212 {
213 unsigned long flags;
214
215 spin_lock_irqsave(&hga_reg_lock, flags);
216 outb_p(0x00, HGA_STATUS_PORT);
217 outb_p(HGA_GFX_MODE_EN, HGA_GFX_PORT);
218 outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_GRAPHICS, HGA_MODE_PORT);
219
220 write_hga_b(0x35, 0x00); /* horizontal total */
221 write_hga_b(0x2d, 0x01); /* horizontal displayed */
222 write_hga_b(0x2e, 0x02); /* horizontal sync pos */
223 write_hga_b(0x07, 0x03); /* horizontal sync width */
224
225 write_hga_b(0x5b, 0x04); /* vertical total */
226 write_hga_b(0x02, 0x05); /* vertical total adjust */
227 write_hga_b(0x57, 0x06); /* vertical displayed */
228 write_hga_b(0x57, 0x07); /* vertical sync pos */
229
230 write_hga_b(0x02, 0x08); /* interlace mode */
231 write_hga_b(0x03, 0x09); /* maximum scanline */
232 write_hga_b(0x00, 0x0a); /* cursor start */
233 write_hga_b(0x00, 0x0b); /* cursor end */
234
235 write_hga_w(0x0000, 0x0c); /* start address */
236 write_hga_w(0x0000, 0x0e); /* cursor location */
237
238 hga_mode = HGA_GFX;
239 spin_unlock_irqrestore(&hga_reg_lock, flags);
240 }
241
hga_show_logo(struct fb_info * info)242 static void hga_show_logo(struct fb_info *info)
243 {
244 /*
245 void __iomem *dest = hga_vram;
246 char *logo = linux_logo_bw;
247 int x, y;
248
249 for (y = 134; y < 134 + 80 ; y++) * this needs some cleanup *
250 for (x = 0; x < 10 ; x++)
251 writeb(~*(logo++),(dest + HGA_ROWADDR(y) + x + 40));
252 */
253 }
254
hga_pan(unsigned int xoffset,unsigned int yoffset)255 static void hga_pan(unsigned int xoffset, unsigned int yoffset)
256 {
257 unsigned int base;
258 unsigned long flags;
259
260 base = (yoffset / 8) * 90 + xoffset;
261 spin_lock_irqsave(&hga_reg_lock, flags);
262 write_hga_w(base, 0x0c); /* start address */
263 spin_unlock_irqrestore(&hga_reg_lock, flags);
264 DPRINTK("hga_pan: base:%d\n", base);
265 }
266
hga_blank(int blank_mode)267 static void hga_blank(int blank_mode)
268 {
269 unsigned long flags;
270
271 spin_lock_irqsave(&hga_reg_lock, flags);
272 if (blank_mode) {
273 outb_p(0x00, HGA_MODE_PORT); /* disable video */
274 } else {
275 outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_GRAPHICS, HGA_MODE_PORT);
276 }
277 spin_unlock_irqrestore(&hga_reg_lock, flags);
278 }
279
hga_card_detect(void)280 static int __init hga_card_detect(void)
281 {
282 int count = 0;
283 void __iomem *p, *q;
284 unsigned short p_save, q_save;
285
286 hga_vram_len = 0x08000;
287
288 hga_vram = ioremap(0xb0000, hga_vram_len);
289
290 if (request_region(0x3b0, 12, "hgafb"))
291 release_io_ports = 1;
292 if (request_region(0x3bf, 1, "hgafb"))
293 release_io_port = 1;
294
295 /* do a memory check */
296
297 p = hga_vram;
298 q = hga_vram + 0x01000;
299
300 p_save = readw(p); q_save = readw(q);
301
302 writew(0xaa55, p); if (readw(p) == 0xaa55) count++;
303 writew(0x55aa, p); if (readw(p) == 0x55aa) count++;
304 writew(p_save, p);
305
306 if (count != 2)
307 goto error;
308
309 /* Ok, there is definitely a card registering at the correct
310 * memory location, so now we do an I/O port test.
311 */
312
313 if (!test_hga_b(0x66, 0x0f)) /* cursor low register */
314 goto error;
315
316 if (!test_hga_b(0x99, 0x0f)) /* cursor low register */
317 goto error;
318
319 /* See if the card is a Hercules, by checking whether the vsync
320 * bit of the status register is changing. This test lasts for
321 * approximately 1/10th of a second.
322 */
323
324 p_save = q_save = inb_p(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;
325
326 for (count=0; count < 50000 && p_save == q_save; count++) {
327 q_save = inb(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;
328 udelay(2);
329 }
330
331 if (p_save == q_save)
332 goto error;
333
334 switch (inb_p(HGA_STATUS_PORT) & 0x70) {
335 case 0x10:
336 hga_type = TYPE_HERCPLUS;
337 hga_type_name = "HerculesPlus";
338 break;
339 case 0x50:
340 hga_type = TYPE_HERCCOLOR;
341 hga_type_name = "HerculesColor";
342 break;
343 default:
344 hga_type = TYPE_HERC;
345 hga_type_name = "Hercules";
346 break;
347 }
348 return 1;
349 error:
350 if (release_io_ports)
351 release_region(0x3b0, 12);
352 if (release_io_port)
353 release_region(0x3bf, 1);
354 return 0;
355 }
356
357 /**
358 * hgafb_open - open the framebuffer device
359 * @info:pointer to fb_info object containing info for current hga board
360 * @int:open by console system or userland.
361 */
362
hgafb_open(struct fb_info * info,int init)363 static int hgafb_open(struct fb_info *info, int init)
364 {
365 hga_gfx_mode();
366 hga_clear_screen();
367 if (!nologo) hga_show_logo(info);
368 return 0;
369 }
370
371 /**
372 * hgafb_open - open the framebuffer device
373 * @info:pointer to fb_info object containing info for current hga board
374 * @int:open by console system or userland.
375 */
376
hgafb_release(struct fb_info * info,int init)377 static int hgafb_release(struct fb_info *info, int init)
378 {
379 hga_txt_mode();
380 hga_clear_screen();
381 return 0;
382 }
383
384 /**
385 * hgafb_setcolreg - set color registers
386 * @regno:register index to set
387 * @red:red value, unused
388 * @green:green value, unused
389 * @blue:blue value, unused
390 * @transp:transparency value, unused
391 * @info:unused
392 *
393 * This callback function is used to set the color registers of a HGA
394 * board. Since we have only two fixed colors only @regno is checked.
395 * A zero is returned on success and 1 for failure.
396 */
397
hgafb_setcolreg(u_int regno,u_int red,u_int green,u_int blue,u_int transp,struct fb_info * info)398 static int hgafb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
399 u_int transp, struct fb_info *info)
400 {
401 if (regno > 1)
402 return 1;
403 return 0;
404 }
405
406 /**
407 * hga_pan_display - pan or wrap the display
408 * @var:contains new xoffset, yoffset and vmode values
409 * @info:pointer to fb_info object containing info for current hga board
410 *
411 * This function looks only at xoffset, yoffset and the %FB_VMODE_YWRAP
412 * flag in @var. If input parameters are correct it calls hga_pan() to
413 * program the hardware. @info->var is updated to the new values.
414 * A zero is returned on success and %-EINVAL for failure.
415 */
416
hgafb_pan_display(struct fb_var_screeninfo * var,struct fb_info * info)417 static int hgafb_pan_display(struct fb_var_screeninfo *var,
418 struct fb_info *info)
419 {
420 if (var->vmode & FB_VMODE_YWRAP) {
421 if (var->yoffset < 0 ||
422 var->yoffset >= info->var.yres_virtual ||
423 var->xoffset)
424 return -EINVAL;
425 } else {
426 if (var->xoffset + var->xres > info->var.xres_virtual
427 || var->yoffset + var->yres > info->var.yres_virtual
428 || var->yoffset % 8)
429 return -EINVAL;
430 }
431
432 hga_pan(var->xoffset, var->yoffset);
433 return 0;
434 }
435
436 /**
437 * hgafb_blank - (un)blank the screen
438 * @blank_mode:blanking method to use
439 * @info:unused
440 *
441 * Blank the screen if blank_mode != 0, else unblank.
442 * Implements VESA suspend and powerdown modes on hardware that supports
443 * disabling hsync/vsync:
444 * @blank_mode == 2 means suspend vsync,
445 * @blank_mode == 3 means suspend hsync,
446 * @blank_mode == 4 means powerdown.
447 */
448
hgafb_blank(int blank_mode,struct fb_info * info)449 static int hgafb_blank(int blank_mode, struct fb_info *info)
450 {
451 hga_blank(blank_mode);
452 return 0;
453 }
454
455 /*
456 * Accel functions
457 */
458 #ifdef CONFIG_FB_HGA_ACCEL
hgafb_fillrect(struct fb_info * info,const struct fb_fillrect * rect)459 static void hgafb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
460 {
461 u_int rows, y;
462 u8 __iomem *dest;
463
464 y = rect->dy;
465
466 for (rows = rect->height; rows--; y++) {
467 dest = rowaddr(info, y) + (rect->dx >> 3);
468 switch (rect->rop) {
469 case ROP_COPY:
470 //fb_memset(dest, rect->color, (rect->width >> 3));
471 break;
472 case ROP_XOR:
473 fb_writeb(~(fb_readb(dest)), dest);
474 break;
475 }
476 }
477 }
478
hgafb_copyarea(struct fb_info * info,const struct fb_copyarea * area)479 static void hgafb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
480 {
481 u_int rows, y1, y2;
482 u8 __iomem *src;
483 u8 __iomem *dest;
484
485 if (area->dy <= area->sy) {
486 y1 = area->sy;
487 y2 = area->dy;
488
489 for (rows = area->height; rows--; ) {
490 src = rowaddr(info, y1) + (area->sx >> 3);
491 dest = rowaddr(info, y2) + (area->dx >> 3);
492 //fb_memmove(dest, src, (area->width >> 3));
493 y1++;
494 y2++;
495 }
496 } else {
497 y1 = area->sy + area->height - 1;
498 y2 = area->dy + area->height - 1;
499
500 for (rows = area->height; rows--;) {
501 src = rowaddr(info, y1) + (area->sx >> 3);
502 dest = rowaddr(info, y2) + (area->dx >> 3);
503 //fb_memmove(dest, src, (area->width >> 3));
504 y1--;
505 y2--;
506 }
507 }
508 }
509
hgafb_imageblit(struct fb_info * info,const struct fb_image * image)510 static void hgafb_imageblit(struct fb_info *info, const struct fb_image *image)
511 {
512 u8 __iomem *dest;
513 u8 *cdat = (u8 *) image->data;
514 u_int rows, y = image->dy;
515 u8 d;
516
517 for (rows = image->height; rows--; y++) {
518 d = *cdat++;
519 dest = rowaddr(info, y) + (image->dx >> 3);
520 fb_writeb(d, dest);
521 }
522 }
523 #else /* !CONFIG_FB_HGA_ACCEL */
524 #define hgafb_fillrect cfb_fillrect
525 #define hgafb_copyarea cfb_copyarea
526 #define hgafb_imageblit cfb_imageblit
527 #endif /* CONFIG_FB_HGA_ACCEL */
528
529
530 static struct fb_ops hgafb_ops = {
531 .owner = THIS_MODULE,
532 .fb_open = hgafb_open,
533 .fb_release = hgafb_release,
534 .fb_setcolreg = hgafb_setcolreg,
535 .fb_pan_display = hgafb_pan_display,
536 .fb_blank = hgafb_blank,
537 .fb_fillrect = hgafb_fillrect,
538 .fb_copyarea = hgafb_copyarea,
539 .fb_imageblit = hgafb_imageblit,
540 };
541
542 /* ------------------------------------------------------------------------- *
543 *
544 * Functions in fb_info
545 *
546 * ------------------------------------------------------------------------- */
547
548 /* ------------------------------------------------------------------------- */
549
550 /*
551 * Initialization
552 */
553
hgafb_probe(struct platform_device * pdev)554 static int __init hgafb_probe(struct platform_device *pdev)
555 {
556 struct fb_info *info;
557
558 if (! hga_card_detect()) {
559 printk(KERN_INFO "hgafb: HGA card not detected.\n");
560 if (hga_vram)
561 iounmap(hga_vram);
562 return -EINVAL;
563 }
564
565 printk(KERN_INFO "hgafb: %s with %ldK of memory detected.\n",
566 hga_type_name, hga_vram_len/1024);
567
568 info = framebuffer_alloc(0, &pdev->dev);
569 if (!info) {
570 iounmap(hga_vram);
571 return -ENOMEM;
572 }
573
574 hga_fix.smem_start = (unsigned long)hga_vram;
575 hga_fix.smem_len = hga_vram_len;
576
577 info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
578 info->var = hga_default_var;
579 info->fix = hga_fix;
580 info->monspecs.hfmin = 0;
581 info->monspecs.hfmax = 0;
582 info->monspecs.vfmin = 10000;
583 info->monspecs.vfmax = 10000;
584 info->monspecs.dpms = 0;
585 info->fbops = &hgafb_ops;
586 info->screen_base = hga_vram;
587
588 if (register_framebuffer(info) < 0) {
589 framebuffer_release(info);
590 iounmap(hga_vram);
591 return -EINVAL;
592 }
593
594 printk(KERN_INFO "fb%d: %s frame buffer device\n",
595 info->node, info->fix.id);
596 platform_set_drvdata(pdev, info);
597 return 0;
598 }
599
hgafb_remove(struct platform_device * pdev)600 static int hgafb_remove(struct platform_device *pdev)
601 {
602 struct fb_info *info = platform_get_drvdata(pdev);
603
604 hga_txt_mode();
605 hga_clear_screen();
606
607 if (info) {
608 unregister_framebuffer(info);
609 framebuffer_release(info);
610 }
611
612 iounmap(hga_vram);
613
614 if (release_io_ports)
615 release_region(0x3b0, 12);
616
617 if (release_io_port)
618 release_region(0x3bf, 1);
619
620 return 0;
621 }
622
623 static struct platform_driver hgafb_driver = {
624 .probe = hgafb_probe,
625 .remove = hgafb_remove,
626 .driver = {
627 .name = "hgafb",
628 },
629 };
630
631 static struct platform_device *hgafb_device;
632
hgafb_init(void)633 static int __init hgafb_init(void)
634 {
635 int ret;
636
637 if (fb_get_options("hgafb", NULL))
638 return -ENODEV;
639
640 ret = platform_driver_register(&hgafb_driver);
641
642 if (!ret) {
643 hgafb_device = platform_device_register_simple("hgafb", 0, NULL, 0);
644
645 if (IS_ERR(hgafb_device)) {
646 platform_driver_unregister(&hgafb_driver);
647 ret = PTR_ERR(hgafb_device);
648 }
649 }
650
651 return ret;
652 }
653
hgafb_exit(void)654 static void __exit hgafb_exit(void)
655 {
656 platform_device_unregister(hgafb_device);
657 platform_driver_unregister(&hgafb_driver);
658 }
659
660 /* -------------------------------------------------------------------------
661 *
662 * Modularization
663 *
664 * ------------------------------------------------------------------------- */
665
666 MODULE_AUTHOR("Ferenc Bakonyi (fero@drama.obuda.kando.hu)");
667 MODULE_DESCRIPTION("FBDev driver for Hercules Graphics Adaptor");
668 MODULE_LICENSE("GPL");
669
670 module_param(nologo, bool, 0);
671 MODULE_PARM_DESC(nologo, "Disables startup logo if != 0 (default=0)");
672 module_init(hgafb_init);
673 module_exit(hgafb_exit);
674