2 * linux/drivers/video/hgafb.c -- Hercules graphics adaptor frame buffer device
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
10 * - Revision 0.1.8 (23 Oct 2002): Ported to new framebuffer api.
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
16 * - Revision 0.1.5 (13 Mar 2000): spinlocks instead of saveflags();cli();etc
18 * - Revision 0.1.4 (24 Jan 2000): fixed a bug in hga_card_detect() for
20 * - Revision 0.1.3 (22 Jan 2000): modified for the new fb_info structure
21 * screen is cleared after rmmod
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)
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
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>
39 #include <linux/tty.h>
40 #include <linux/slab.h>
41 #include <linux/delay.h>
43 #include <linux/init.h>
44 #include <linux/ioport.h>
45 #include <linux/platform_device.h>
50 #define DPRINTK(args...) printk(KERN_DEBUG __FILE__": " ##args)
52 #define DPRINTK(args...)
56 #define CHKINFO(ret) if (info != &fb_info) { printk(KERN_DEBUG __FILE__": This should never happen, line:%d \n", __LINE__); return ret; }
61 /* Description of the hardware layout */
63 static void __iomem *hga_vram; /* Base of video memory */
64 static unsigned long hga_vram_len; /* Size of video memory */
66 #define HGA_ROWADDR(row) ((row%4)*8192 + (row>>2)*90)
70 static inline u8 __iomem * rowaddr(struct fb_info *info, u_int row)
72 return info->screen_base + HGA_ROWADDR(row);
75 static int hga_mode = -1; /* 0 = txt, 1 = gfx mode */
77 static enum { TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } hga_type;
78 static char *hga_type_name;
80 #define HGA_INDEX_PORT 0x3b4 /* Register select port */
81 #define HGA_VALUE_PORT 0x3b5 /* Register value port */
82 #define HGA_MODE_PORT 0x3b8 /* Mode control port */
83 #define HGA_STATUS_PORT 0x3ba /* Status and Config port */
84 #define HGA_GFX_PORT 0x3bf /* Graphics control port */
86 /* HGA register values */
88 #define HGA_CURSOR_BLINKING 0x00
89 #define HGA_CURSOR_OFF 0x20
90 #define HGA_CURSOR_SLOWBLINK 0x60
92 #define HGA_MODE_GRAPHICS 0x02
93 #define HGA_MODE_VIDEO_EN 0x08
94 #define HGA_MODE_BLINK_EN 0x20
95 #define HGA_MODE_GFX_PAGE1 0x80
97 #define HGA_STATUS_HSYNC 0x01
98 #define HGA_STATUS_VSYNC 0x80
99 #define HGA_STATUS_VIDEO 0x08
101 #define HGA_CONFIG_COL132 0x08
102 #define HGA_GFX_MODE_EN 0x01
103 #define HGA_GFX_PAGE_EN 0x02
107 static DEFINE_SPINLOCK(hga_reg_lock);
109 /* Framebuffer driver structures */
111 static struct fb_var_screeninfo __initdata hga_default_var = {
125 static struct fb_fix_screeninfo __initdata hga_fix = {
127 .type = FB_TYPE_PACKED_PIXELS, /* (not sure) */
128 .visual = FB_VISUAL_MONO10,
132 .accel = FB_ACCEL_NONE
135 /* Don't assume that tty1 will be the initial current console. */
136 static int release_io_port = 0;
137 static int release_io_ports = 0;
138 static int nologo = 0;
140 /* -------------------------------------------------------------------------
142 * Low level hardware functions
144 * ------------------------------------------------------------------------- */
146 static void write_hga_b(unsigned int val, unsigned char reg)
148 outb_p(reg, HGA_INDEX_PORT);
149 outb_p(val, HGA_VALUE_PORT);
152 static void write_hga_w(unsigned int val, unsigned char reg)
154 outb_p(reg, HGA_INDEX_PORT); outb_p(val >> 8, HGA_VALUE_PORT);
155 outb_p(reg+1, HGA_INDEX_PORT); outb_p(val & 0xff, HGA_VALUE_PORT);
158 static int test_hga_b(unsigned char val, unsigned char reg)
160 outb_p(reg, HGA_INDEX_PORT);
161 outb (val, HGA_VALUE_PORT);
162 udelay(20); val = (inb_p(HGA_VALUE_PORT) == val);
166 static void hga_clear_screen(void)
168 unsigned char fillchar = 0xbf; /* magic */
171 spin_lock_irqsave(&hga_reg_lock, flags);
172 if (hga_mode == HGA_TXT)
174 else if (hga_mode == HGA_GFX)
176 spin_unlock_irqrestore(&hga_reg_lock, flags);
177 if (fillchar != 0xbf)
178 memset_io(hga_vram, fillchar, hga_vram_len);
181 static void hga_txt_mode(void)
185 spin_lock_irqsave(&hga_reg_lock, flags);
186 outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_BLINK_EN, HGA_MODE_PORT);
187 outb_p(0x00, HGA_GFX_PORT);
188 outb_p(0x00, HGA_STATUS_PORT);
190 write_hga_b(0x61, 0x00); /* horizontal total */
191 write_hga_b(0x50, 0x01); /* horizontal displayed */
192 write_hga_b(0x52, 0x02); /* horizontal sync pos */
193 write_hga_b(0x0f, 0x03); /* horizontal sync width */
195 write_hga_b(0x19, 0x04); /* vertical total */
196 write_hga_b(0x06, 0x05); /* vertical total adjust */
197 write_hga_b(0x19, 0x06); /* vertical displayed */
198 write_hga_b(0x19, 0x07); /* vertical sync pos */
200 write_hga_b(0x02, 0x08); /* interlace mode */
201 write_hga_b(0x0d, 0x09); /* maximum scanline */
202 write_hga_b(0x0c, 0x0a); /* cursor start */
203 write_hga_b(0x0d, 0x0b); /* cursor end */
205 write_hga_w(0x0000, 0x0c); /* start address */
206 write_hga_w(0x0000, 0x0e); /* cursor location */
209 spin_unlock_irqrestore(&hga_reg_lock, flags);
212 static void hga_gfx_mode(void)
216 spin_lock_irqsave(&hga_reg_lock, flags);
217 outb_p(0x00, HGA_STATUS_PORT);
218 outb_p(HGA_GFX_MODE_EN, HGA_GFX_PORT);
219 outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_GRAPHICS, HGA_MODE_PORT);
221 write_hga_b(0x35, 0x00); /* horizontal total */
222 write_hga_b(0x2d, 0x01); /* horizontal displayed */
223 write_hga_b(0x2e, 0x02); /* horizontal sync pos */
224 write_hga_b(0x07, 0x03); /* horizontal sync width */
226 write_hga_b(0x5b, 0x04); /* vertical total */
227 write_hga_b(0x02, 0x05); /* vertical total adjust */
228 write_hga_b(0x57, 0x06); /* vertical displayed */
229 write_hga_b(0x57, 0x07); /* vertical sync pos */
231 write_hga_b(0x02, 0x08); /* interlace mode */
232 write_hga_b(0x03, 0x09); /* maximum scanline */
233 write_hga_b(0x00, 0x0a); /* cursor start */
234 write_hga_b(0x00, 0x0b); /* cursor end */
236 write_hga_w(0x0000, 0x0c); /* start address */
237 write_hga_w(0x0000, 0x0e); /* cursor location */
240 spin_unlock_irqrestore(&hga_reg_lock, flags);
243 static void hga_show_logo(struct fb_info *info)
246 void __iomem *dest = hga_vram;
247 char *logo = linux_logo_bw;
250 for (y = 134; y < 134 + 80 ; y++) * this needs some cleanup *
251 for (x = 0; x < 10 ; x++)
252 writeb(~*(logo++),(dest + HGA_ROWADDR(y) + x + 40));
256 static void hga_pan(unsigned int xoffset, unsigned int yoffset)
261 base = (yoffset / 8) * 90 + xoffset;
262 spin_lock_irqsave(&hga_reg_lock, flags);
263 write_hga_w(base, 0x0c); /* start address */
264 spin_unlock_irqrestore(&hga_reg_lock, flags);
265 DPRINTK("hga_pan: base:%d\n", base);
268 static void hga_blank(int blank_mode)
272 spin_lock_irqsave(&hga_reg_lock, flags);
274 outb_p(0x00, HGA_MODE_PORT); /* disable video */
276 outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_GRAPHICS, HGA_MODE_PORT);
278 spin_unlock_irqrestore(&hga_reg_lock, flags);
281 static int __init hga_card_detect(void)
285 unsigned short p_save, q_save;
287 hga_vram_len = 0x08000;
289 hga_vram = ioremap(0xb0000, hga_vram_len);
291 if (request_region(0x3b0, 12, "hgafb"))
292 release_io_ports = 1;
293 if (request_region(0x3bf, 1, "hgafb"))
296 /* do a memory check */
299 q = hga_vram + 0x01000;
301 p_save = readw(p); q_save = readw(q);
303 writew(0xaa55, p); if (readw(p) == 0xaa55) count++;
304 writew(0x55aa, p); if (readw(p) == 0x55aa) count++;
311 /* Ok, there is definitely a card registering at the correct
312 * memory location, so now we do an I/O port test.
315 if (!test_hga_b(0x66, 0x0f)) { /* cursor low register */
318 if (!test_hga_b(0x99, 0x0f)) { /* cursor low register */
322 /* See if the card is a Hercules, by checking whether the vsync
323 * bit of the status register is changing. This test lasts for
324 * approximately 1/10th of a second.
327 p_save = q_save = inb_p(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;
329 for (count=0; count < 50000 && p_save == q_save; count++) {
330 q_save = inb(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;
334 if (p_save == q_save)
337 switch (inb_p(HGA_STATUS_PORT) & 0x70) {
339 hga_type = TYPE_HERCPLUS;
340 hga_type_name = "HerculesPlus";
343 hga_type = TYPE_HERCCOLOR;
344 hga_type_name = "HerculesColor";
347 hga_type = TYPE_HERC;
348 hga_type_name = "Hercules";
355 * hgafb_open - open the framebuffer device
356 * @info:pointer to fb_info object containing info for current hga board
357 * @int:open by console system or userland.
360 static int hgafb_open(struct fb_info *info, int init)
364 if (!nologo) hga_show_logo(info);
369 * hgafb_open - open the framebuffer device
370 * @info:pointer to fb_info object containing info for current hga board
371 * @int:open by console system or userland.
374 static int hgafb_release(struct fb_info *info, int init)
382 * hgafb_setcolreg - set color registers
383 * @regno:register index to set
384 * @red:red value, unused
385 * @green:green value, unused
386 * @blue:blue value, unused
387 * @transp:transparency value, unused
390 * This callback function is used to set the color registers of a HGA
391 * board. Since we have only two fixed colors only @regno is checked.
392 * A zero is returned on success and 1 for failure.
395 static int hgafb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
396 u_int transp, struct fb_info *info)
404 * hga_pan_display - pan or wrap the display
405 * @var:contains new xoffset, yoffset and vmode values
406 * @info:pointer to fb_info object containing info for current hga board
408 * This function looks only at xoffset, yoffset and the %FB_VMODE_YWRAP
409 * flag in @var. If input parameters are correct it calls hga_pan() to
410 * program the hardware. @info->var is updated to the new values.
411 * A zero is returned on success and %-EINVAL for failure.
414 static int hgafb_pan_display(struct fb_var_screeninfo *var,
415 struct fb_info *info)
417 if (var->vmode & FB_VMODE_YWRAP) {
418 if (var->yoffset < 0 ||
419 var->yoffset >= info->var.yres_virtual ||
423 if (var->xoffset + var->xres > info->var.xres_virtual
424 || var->yoffset + var->yres > info->var.yres_virtual
429 hga_pan(var->xoffset, var->yoffset);
434 * hgafb_blank - (un)blank the screen
435 * @blank_mode:blanking method to use
438 * Blank the screen if blank_mode != 0, else unblank.
439 * Implements VESA suspend and powerdown modes on hardware that supports
440 * disabling hsync/vsync:
441 * @blank_mode == 2 means suspend vsync,
442 * @blank_mode == 3 means suspend hsync,
443 * @blank_mode == 4 means powerdown.
446 static int hgafb_blank(int blank_mode, struct fb_info *info)
448 hga_blank(blank_mode);
455 #ifdef CONFIG_FB_HGA_ACCEL
456 static void hgafb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
463 for (rows = rect->height; rows--; y++) {
464 dest = rowaddr(info, y) + (rect->dx >> 3);
467 //fb_memset(dest, rect->color, (rect->width >> 3));
470 fb_writeb(~(fb_readb(dest)), dest);
476 static void hgafb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
482 if (area->dy <= area->sy) {
486 for (rows = area->height; rows--; ) {
487 src = rowaddr(info, y1) + (area->sx >> 3);
488 dest = rowaddr(info, y2) + (area->dx >> 3);
489 //fb_memmove(dest, src, (area->width >> 3));
494 y1 = area->sy + area->height - 1;
495 y2 = area->dy + area->height - 1;
497 for (rows = area->height; rows--;) {
498 src = rowaddr(info, y1) + (area->sx >> 3);
499 dest = rowaddr(info, y2) + (area->dx >> 3);
500 //fb_memmove(dest, src, (area->width >> 3));
507 static void hgafb_imageblit(struct fb_info *info, const struct fb_image *image)
510 u8 *cdat = (u8 *) image->data;
511 u_int rows, y = image->dy;
514 for (rows = image->height; rows--; y++) {
516 dest = rowaddr(info, y) + (image->dx >> 3);
520 #else /* !CONFIG_FB_HGA_ACCEL */
521 #define hgafb_fillrect cfb_fillrect
522 #define hgafb_copyarea cfb_copyarea
523 #define hgafb_imageblit cfb_imageblit
524 #endif /* CONFIG_FB_HGA_ACCEL */
527 static struct fb_ops hgafb_ops = {
528 .owner = THIS_MODULE,
529 .fb_open = hgafb_open,
530 .fb_release = hgafb_release,
531 .fb_setcolreg = hgafb_setcolreg,
532 .fb_pan_display = hgafb_pan_display,
533 .fb_blank = hgafb_blank,
534 .fb_fillrect = hgafb_fillrect,
535 .fb_copyarea = hgafb_copyarea,
536 .fb_imageblit = hgafb_imageblit,
539 /* ------------------------------------------------------------------------- *
541 * Functions in fb_info
543 * ------------------------------------------------------------------------- */
545 /* ------------------------------------------------------------------------- */
551 static int __init hgafb_probe(struct device *device)
553 struct fb_info *info;
555 if (! hga_card_detect()) {
556 printk(KERN_INFO "hgafb: HGA card not detected.\n");
562 printk(KERN_INFO "hgafb: %s with %ldK of memory detected.\n",
563 hga_type_name, hga_vram_len/1024);
565 info = framebuffer_alloc(0, NULL);
571 hga_fix.smem_start = (unsigned long)hga_vram;
572 hga_fix.smem_len = hga_vram_len;
574 info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
575 info->var = hga_default_var;
577 info->monspecs.hfmin = 0;
578 info->monspecs.hfmax = 0;
579 info->monspecs.vfmin = 10000;
580 info->monspecs.vfmax = 10000;
581 info->monspecs.dpms = 0;
582 info->fbops = &hgafb_ops;
583 info->screen_base = hga_vram;
585 if (register_framebuffer(info) < 0) {
586 framebuffer_release(info);
591 printk(KERN_INFO "fb%d: %s frame buffer device\n",
592 info->node, info->fix.id);
593 dev_set_drvdata(device, info);
597 static int hgafb_remove(struct device *device)
599 struct fb_info *info = dev_get_drvdata(device);
605 unregister_framebuffer(info);
606 framebuffer_release(info);
611 if (release_io_ports)
612 release_region(0x3b0, 12);
615 release_region(0x3bf, 1);
620 static struct device_driver hgafb_driver = {
622 .bus = &platform_bus_type,
623 .probe = hgafb_probe,
624 .remove = hgafb_remove,
627 static struct platform_device hgafb_device = {
631 static int __init hgafb_init(void)
635 if (fb_get_options("hgafb", NULL))
638 ret = driver_register(&hgafb_driver);
641 ret = platform_device_register(&hgafb_device);
643 driver_unregister(&hgafb_driver);
649 static void __exit hgafb_exit(void)
651 platform_device_unregister(&hgafb_device);
652 driver_unregister(&hgafb_driver);
655 /* -------------------------------------------------------------------------
659 * ------------------------------------------------------------------------- */
661 MODULE_AUTHOR("Ferenc Bakonyi (fero@drama.obuda.kando.hu)");
662 MODULE_DESCRIPTION("FBDev driver for Hercules Graphics Adaptor");
663 MODULE_LICENSE("GPL");
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);