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