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/delay.h>
41 #include <linux/init.h>
42 #include <linux/ioport.h>
43 #include <linux/platform_device.h>
48 #define DPRINTK(args...) printk(KERN_DEBUG __FILE__": " ##args)
50 #define DPRINTK(args...)
54 #define CHKINFO(ret) if (info != &fb_info) { printk(KERN_DEBUG __FILE__": This should never happen, line:%d \n", __LINE__); return ret; }
59 /* Description of the hardware layout */
61 static void __iomem *hga_vram; /* Base of video memory */
62 static unsigned long hga_vram_len; /* Size of video memory */
64 #define HGA_ROWADDR(row) ((row%4)*8192 + (row>>2)*90)
68 static inline u8 __iomem * rowaddr(struct fb_info *info, u_int row)
70 return info->screen_base + HGA_ROWADDR(row);
73 static int hga_mode = -1; /* 0 = txt, 1 = gfx mode */
75 static enum { TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } hga_type;
76 static char *hga_type_name;
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 */
84 /* HGA register values */
86 #define HGA_CURSOR_BLINKING 0x00
87 #define HGA_CURSOR_OFF 0x20
88 #define HGA_CURSOR_SLOWBLINK 0x60
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
95 #define HGA_STATUS_HSYNC 0x01
96 #define HGA_STATUS_VSYNC 0x80
97 #define HGA_STATUS_VIDEO 0x08
99 #define HGA_CONFIG_COL132 0x08
100 #define HGA_GFX_MODE_EN 0x01
101 #define HGA_GFX_PAGE_EN 0x02
105 static DEFINE_SPINLOCK(hga_reg_lock);
107 /* Framebuffer driver structures */
109 static struct fb_var_screeninfo hga_default_var = {
123 static struct fb_fix_screeninfo hga_fix = {
125 .type = FB_TYPE_PACKED_PIXELS, /* (not sure) */
126 .visual = FB_VISUAL_MONO10,
130 .accel = FB_ACCEL_NONE
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;
138 /* -------------------------------------------------------------------------
140 * Low level hardware functions
142 * ------------------------------------------------------------------------- */
144 static void write_hga_b(unsigned int val, unsigned char reg)
146 outb_p(reg, HGA_INDEX_PORT);
147 outb_p(val, HGA_VALUE_PORT);
150 static void write_hga_w(unsigned int val, unsigned char reg)
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);
156 static int test_hga_b(unsigned char val, unsigned char reg)
158 outb_p(reg, HGA_INDEX_PORT);
159 outb (val, HGA_VALUE_PORT);
160 udelay(20); val = (inb_p(HGA_VALUE_PORT) == val);
164 static void hga_clear_screen(void)
166 unsigned char fillchar = 0xbf; /* magic */
169 spin_lock_irqsave(&hga_reg_lock, flags);
170 if (hga_mode == HGA_TXT)
172 else if (hga_mode == HGA_GFX)
174 spin_unlock_irqrestore(&hga_reg_lock, flags);
175 if (fillchar != 0xbf)
176 memset_io(hga_vram, fillchar, hga_vram_len);
179 static void hga_txt_mode(void)
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);
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 */
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 */
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 */
203 write_hga_w(0x0000, 0x0c); /* start address */
204 write_hga_w(0x0000, 0x0e); /* cursor location */
207 spin_unlock_irqrestore(&hga_reg_lock, flags);
210 static void hga_gfx_mode(void)
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);
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 */
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 */
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 */
234 write_hga_w(0x0000, 0x0c); /* start address */
235 write_hga_w(0x0000, 0x0e); /* cursor location */
238 spin_unlock_irqrestore(&hga_reg_lock, flags);
241 static void hga_show_logo(struct fb_info *info)
244 void __iomem *dest = hga_vram;
245 char *logo = linux_logo_bw;
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));
254 static void hga_pan(unsigned int xoffset, unsigned int yoffset)
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);
266 static void hga_blank(int blank_mode)
270 spin_lock_irqsave(&hga_reg_lock, flags);
272 outb_p(0x00, HGA_MODE_PORT); /* disable video */
274 outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_GRAPHICS, HGA_MODE_PORT);
276 spin_unlock_irqrestore(&hga_reg_lock, flags);
279 static int hga_card_detect(void)
283 unsigned short p_save, q_save;
285 hga_vram_len = 0x08000;
287 hga_vram = ioremap(0xb0000, hga_vram_len);
289 if (request_region(0x3b0, 12, "hgafb"))
290 release_io_ports = 1;
291 if (request_region(0x3bf, 1, "hgafb"))
294 /* do a memory check */
297 q = hga_vram + 0x01000;
299 p_save = readw(p); q_save = readw(q);
301 writew(0xaa55, p); if (readw(p) == 0xaa55) count++;
302 writew(0x55aa, p); if (readw(p) == 0x55aa) count++;
308 /* Ok, there is definitely a card registering at the correct
309 * memory location, so now we do an I/O port test.
312 if (!test_hga_b(0x66, 0x0f)) /* cursor low register */
315 if (!test_hga_b(0x99, 0x0f)) /* cursor low register */
318 /* See if the card is a Hercules, by checking whether the vsync
319 * bit of the status register is changing. This test lasts for
320 * approximately 1/10th of a second.
323 p_save = q_save = inb_p(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;
325 for (count=0; count < 50000 && p_save == q_save; count++) {
326 q_save = inb(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;
330 if (p_save == q_save)
333 switch (inb_p(HGA_STATUS_PORT) & 0x70) {
335 hga_type = TYPE_HERCPLUS;
336 hga_type_name = "HerculesPlus";
339 hga_type = TYPE_HERCCOLOR;
340 hga_type_name = "HerculesColor";
343 hga_type = TYPE_HERC;
344 hga_type_name = "Hercules";
349 if (release_io_ports)
350 release_region(0x3b0, 12);
352 release_region(0x3bf, 1);
357 * hgafb_open - open the framebuffer device
358 * @info:pointer to fb_info object containing info for current hga board
359 * @int:open by console system or userland.
362 static int hgafb_open(struct fb_info *info, int init)
366 if (!nologo) hga_show_logo(info);
371 * hgafb_open - open the framebuffer device
372 * @info:pointer to fb_info object containing info for current hga board
373 * @int:open by console system or userland.
376 static int hgafb_release(struct fb_info *info, int init)
384 * hgafb_setcolreg - set color registers
385 * @regno:register index to set
386 * @red:red value, unused
387 * @green:green value, unused
388 * @blue:blue value, unused
389 * @transp:transparency value, unused
392 * This callback function is used to set the color registers of a HGA
393 * board. Since we have only two fixed colors only @regno is checked.
394 * A zero is returned on success and 1 for failure.
397 static int hgafb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
398 u_int transp, struct fb_info *info)
406 * hga_pan_display - pan or wrap the display
407 * @var:contains new xoffset, yoffset and vmode values
408 * @info:pointer to fb_info object containing info for current hga board
410 * This function looks only at xoffset, yoffset and the %FB_VMODE_YWRAP
411 * flag in @var. If input parameters are correct it calls hga_pan() to
412 * program the hardware. @info->var is updated to the new values.
413 * A zero is returned on success and %-EINVAL for failure.
416 static int hgafb_pan_display(struct fb_var_screeninfo *var,
417 struct fb_info *info)
419 if (var->vmode & FB_VMODE_YWRAP) {
420 if (var->yoffset < 0 ||
421 var->yoffset >= info->var.yres_virtual ||
425 if (var->xoffset + info->var.xres > info->var.xres_virtual
426 || var->yoffset + info->var.yres > info->var.yres_virtual
431 hga_pan(var->xoffset, var->yoffset);
436 * hgafb_blank - (un)blank the screen
437 * @blank_mode:blanking method to use
440 * Blank the screen if blank_mode != 0, else unblank.
441 * Implements VESA suspend and powerdown modes on hardware that supports
442 * disabling hsync/vsync:
443 * @blank_mode == 2 means suspend vsync,
444 * @blank_mode == 3 means suspend hsync,
445 * @blank_mode == 4 means powerdown.
448 static int hgafb_blank(int blank_mode, struct fb_info *info)
450 hga_blank(blank_mode);
457 static void hgafb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
464 for (rows = rect->height; rows--; y++) {
465 dest = rowaddr(info, y) + (rect->dx >> 3);
468 memset_io(dest, rect->color, (rect->width >> 3));
471 fb_writeb(~(fb_readb(dest)), dest);
477 static void hgafb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
483 if (area->dy <= area->sy) {
487 for (rows = area->height; rows--; ) {
488 src = rowaddr(info, y1) + (area->sx >> 3);
489 dest = rowaddr(info, y2) + (area->dx >> 3);
490 memmove(dest, src, (area->width >> 3));
495 y1 = area->sy + area->height - 1;
496 y2 = area->dy + area->height - 1;
498 for (rows = area->height; rows--;) {
499 src = rowaddr(info, y1) + (area->sx >> 3);
500 dest = rowaddr(info, y2) + (area->dx >> 3);
501 memmove(dest, src, (area->width >> 3));
508 static void hgafb_imageblit(struct fb_info *info, const struct fb_image *image)
511 u8 *cdat = (u8 *) image->data;
512 u_int rows, y = image->dy;
516 for (rows = image->height; rows--; y++) {
517 for (x = 0; x < image->width; x+= 8) {
519 dest = rowaddr(info, y) + ((image->dx + x)>> 3);
525 static struct fb_ops hgafb_ops = {
526 .owner = THIS_MODULE,
527 .fb_open = hgafb_open,
528 .fb_release = hgafb_release,
529 .fb_setcolreg = hgafb_setcolreg,
530 .fb_pan_display = hgafb_pan_display,
531 .fb_blank = hgafb_blank,
532 .fb_fillrect = hgafb_fillrect,
533 .fb_copyarea = hgafb_copyarea,
534 .fb_imageblit = hgafb_imageblit,
537 /* ------------------------------------------------------------------------- *
539 * Functions in fb_info
541 * ------------------------------------------------------------------------- */
543 /* ------------------------------------------------------------------------- */
549 static int hgafb_probe(struct platform_device *pdev)
551 struct fb_info *info;
553 if (! hga_card_detect()) {
554 printk(KERN_INFO "hgafb: HGA card not detected.\n");
560 printk(KERN_INFO "hgafb: %s with %ldK of memory detected.\n",
561 hga_type_name, hga_vram_len/1024);
563 info = framebuffer_alloc(0, &pdev->dev);
569 hga_fix.smem_start = (unsigned long)hga_vram;
570 hga_fix.smem_len = hga_vram_len;
572 info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
573 info->var = hga_default_var;
575 info->monspecs.hfmin = 0;
576 info->monspecs.hfmax = 0;
577 info->monspecs.vfmin = 10000;
578 info->monspecs.vfmax = 10000;
579 info->monspecs.dpms = 0;
580 info->fbops = &hgafb_ops;
581 info->screen_base = hga_vram;
583 if (register_framebuffer(info) < 0) {
584 framebuffer_release(info);
589 printk(KERN_INFO "fb%d: %s frame buffer device\n",
590 info->node, info->fix.id);
591 platform_set_drvdata(pdev, info);
595 static int hgafb_remove(struct platform_device *pdev)
597 struct fb_info *info = platform_get_drvdata(pdev);
603 unregister_framebuffer(info);
604 framebuffer_release(info);
609 if (release_io_ports)
610 release_region(0x3b0, 12);
613 release_region(0x3bf, 1);
618 static struct platform_driver hgafb_driver = {
619 .probe = hgafb_probe,
620 .remove = hgafb_remove,
626 static struct platform_device *hgafb_device;
628 static int __init hgafb_init(void)
632 if (fb_get_options("hgafb", NULL))
635 ret = platform_driver_register(&hgafb_driver);
638 hgafb_device = platform_device_register_simple("hgafb", 0, NULL, 0);
640 if (IS_ERR(hgafb_device)) {
641 platform_driver_unregister(&hgafb_driver);
642 ret = PTR_ERR(hgafb_device);
649 static void __exit hgafb_exit(void)
651 platform_device_unregister(hgafb_device);
652 platform_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);