681 lines · c
1/*2 * linux/drivers/video/hgafb.c -- Hercules graphics adaptor frame buffer device3 *4 * Created 25 Nov 1999 by Ferenc Bakonyi (fero@drama.obuda.kando.hu)5 * Based on skeletonfb.c by Geert Uytterhoeven and6 * mdacon.c by Andrew Apted7 *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 cards13 * being detected as Hercules. (Paul G.)14 * - Revision 0.1.6 (17 Aug 2000): new style structs15 * documentation16 * - Revision 0.1.5 (13 Mar 2000): spinlocks instead of saveflags();cli();etc17 * minor fixes18 * - Revision 0.1.4 (24 Jan 2000): fixed a bug in hga_card_detect() for19 * HGA-only systems20 * - Revision 0.1.3 (22 Jan 2000): modified for the new fb_info structure21 * screen is cleared after rmmod22 * virtual resolutions23 * module parameter 'nologo={0|1}'24 * the most important: boot logo :)25 * - Revision 0.1.0 (6 Dec 1999): faster scrolling and minor fixes26 * - First release (25 Nov 1999)27 *28 * This file is subject to the terms and conditions of the GNU General Public29 * License. See the file COPYING in the main directory of this archive30 * 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 048#define DPRINTK(args...) printk(KERN_DEBUG __FILE__": " ##args)49#else50#define DPRINTK(args...)51#endif52 53#if 054#define CHKINFO(ret) if (info != &fb_info) { printk(KERN_DEBUG __FILE__": This should never happen, line:%d \n", __LINE__); return ret; }55#else56#define CHKINFO(ret)57#endif58 59/* Description of the hardware layout */60 61static void __iomem *hga_vram; /* Base of video memory */62static 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 066#define HGA_GFX 167 68static inline u8 __iomem * rowaddr(struct fb_info *info, u_int row)69{70 return info->screen_base + HGA_ROWADDR(row);71}72 73static int hga_mode = -1; /* 0 = txt, 1 = gfx mode */74 75static enum { TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } hga_type;76static 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 0x0087#define HGA_CURSOR_OFF 0x2088#define HGA_CURSOR_SLOWBLINK 0x6089 90#define HGA_MODE_GRAPHICS 0x0291#define HGA_MODE_VIDEO_EN 0x0892#define HGA_MODE_BLINK_EN 0x2093#define HGA_MODE_GFX_PAGE1 0x8094 95#define HGA_STATUS_HSYNC 0x0196#define HGA_STATUS_VSYNC 0x8097#define HGA_STATUS_VIDEO 0x0898 99#define HGA_CONFIG_COL132 0x08100#define HGA_GFX_MODE_EN 0x01101#define HGA_GFX_PAGE_EN 0x02102 103/* Global locks */104 105static DEFINE_SPINLOCK(hga_reg_lock);106 107/* Framebuffer driver structures */108 109static 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 123static 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_NONE131};132 133/* Don't assume that tty1 will be the initial current console. */134static int release_io_port = 0;135static int release_io_ports = 0;136static bool nologo = 0;137 138/* -------------------------------------------------------------------------139 *140 * Low level hardware functions141 *142 * ------------------------------------------------------------------------- */143 144static 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 150static 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 156static 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 164static 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 179static 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 210static 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 241static 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 254static 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 266static 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 279static 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 return -ENOMEM;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 correct311 * 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 vsync321 * bit of the status register is changing. This test lasts for322 * 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 0;350error:351 if (release_io_ports)352 release_region(0x3b0, 12);353 if (release_io_port)354 release_region(0x3bf, 1);355 356 iounmap(hga_vram);357 358 pr_err("hgafb: HGA card not detected.\n");359 360 return -EINVAL;361}362 363/**364 * hgafb_open - open the framebuffer device365 * @info: pointer to fb_info object containing info for current hga board366 * @init: open by console system or userland.367 *368 * Returns: %0369 */370 371static int hgafb_open(struct fb_info *info, int init)372{373 hga_gfx_mode();374 hga_clear_screen();375 if (!nologo) hga_show_logo(info);376 return 0;377}378 379/**380 * hgafb_release - open the framebuffer device381 * @info: pointer to fb_info object containing info for current hga board382 * @init: open by console system or userland.383 *384 * Returns: %0385 */386 387static int hgafb_release(struct fb_info *info, int init)388{389 hga_txt_mode();390 hga_clear_screen();391 return 0;392}393 394/**395 * hgafb_setcolreg - set color registers396 * @regno:register index to set397 * @red:red value, unused398 * @green:green value, unused399 * @blue:blue value, unused400 * @transp:transparency value, unused401 * @info:unused402 *403 * This callback function is used to set the color registers of a HGA404 * board. Since we have only two fixed colors only @regno is checked.405 * A zero is returned on success and 1 for failure.406 *407 * Returns: %0408 */409 410static int hgafb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,411 u_int transp, struct fb_info *info)412{413 if (regno > 1)414 return 1;415 return 0;416}417 418/**419 * hgafb_pan_display - pan or wrap the display420 * @var:contains new xoffset, yoffset and vmode values421 * @info:pointer to fb_info object containing info for current hga board422 *423 * This function looks only at xoffset, yoffset and the %FB_VMODE_YWRAP424 * flag in @var. If input parameters are correct it calls hga_pan() to425 * program the hardware. @info->var is updated to the new values.426 *427 * Returns: %0 on success or %-EINVAL for failure.428 */429 430static int hgafb_pan_display(struct fb_var_screeninfo *var,431 struct fb_info *info)432{433 if (var->vmode & FB_VMODE_YWRAP) {434 if (var->yoffset >= info->var.yres_virtual ||435 var->xoffset)436 return -EINVAL;437 } else {438 if (var->xoffset + info->var.xres > info->var.xres_virtual439 || var->yoffset + info->var.yres > info->var.yres_virtual440 || var->yoffset % 8)441 return -EINVAL;442 }443 444 hga_pan(var->xoffset, var->yoffset);445 return 0;446}447 448/**449 * hgafb_blank - (un)blank the screen450 * @blank_mode:blanking method to use451 * @info:unused452 *453 * Blank the screen if blank_mode != 0, else unblank.454 * Implements VESA suspend and powerdown modes on hardware that supports455 * disabling hsync/vsync:456 * @blank_mode == 2 means suspend vsync,457 * @blank_mode == 3 means suspend hsync,458 * @blank_mode == 4 means powerdown.459 *460 * Returns: %0461 */462 463static int hgafb_blank(int blank_mode, struct fb_info *info)464{465 hga_blank(blank_mode);466 return 0;467}468 469/*470 * Accel functions471 */472static void hgafb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)473{474 u_int rows, y;475 u8 __iomem *dest;476 477 y = rect->dy;478 479 for (rows = rect->height; rows--; y++) {480 dest = rowaddr(info, y) + (rect->dx >> 3);481 switch (rect->rop) {482 case ROP_COPY:483 memset_io(dest, rect->color, (rect->width >> 3));484 break;485 case ROP_XOR:486 fb_writeb(~(fb_readb(dest)), dest);487 break;488 }489 }490}491 492static void hgafb_copyarea(struct fb_info *info, const struct fb_copyarea *area)493{494 u_int rows, y1, y2;495 u8 __iomem *src;496 u8 __iomem *dest;497 498 if (area->dy <= area->sy) {499 y1 = area->sy;500 y2 = area->dy;501 502 for (rows = area->height; rows--; ) {503 src = rowaddr(info, y1) + (area->sx >> 3);504 dest = rowaddr(info, y2) + (area->dx >> 3);505 memmove(dest, src, (area->width >> 3));506 y1++;507 y2++;508 }509 } else {510 y1 = area->sy + area->height - 1;511 y2 = area->dy + area->height - 1;512 513 for (rows = area->height; rows--;) {514 src = rowaddr(info, y1) + (area->sx >> 3);515 dest = rowaddr(info, y2) + (area->dx >> 3);516 memmove(dest, src, (area->width >> 3));517 y1--;518 y2--;519 }520 }521}522 523static void hgafb_imageblit(struct fb_info *info, const struct fb_image *image)524{525 u8 __iomem *dest;526 u8 *cdat = (u8 *) image->data;527 u_int rows, y = image->dy;528 u_int x;529 u8 d;530 531 for (rows = image->height; rows--; y++) {532 for (x = 0; x < image->width; x+= 8) {533 d = *cdat++;534 dest = rowaddr(info, y) + ((image->dx + x)>> 3);535 fb_writeb(d, dest);536 }537 }538}539 540static const struct fb_ops hgafb_ops = {541 .owner = THIS_MODULE,542 .fb_open = hgafb_open,543 .fb_release = hgafb_release,544 __FB_DEFAULT_IOMEM_OPS_RDWR,545 .fb_setcolreg = hgafb_setcolreg,546 .fb_pan_display = hgafb_pan_display,547 .fb_blank = hgafb_blank,548 .fb_fillrect = hgafb_fillrect,549 .fb_copyarea = hgafb_copyarea,550 .fb_imageblit = hgafb_imageblit,551 __FB_DEFAULT_IOMEM_OPS_MMAP,552};553 554/* ------------------------------------------------------------------------- *555 *556 * Functions in fb_info557 *558 * ------------------------------------------------------------------------- */559 560/* ------------------------------------------------------------------------- */561 562 /*563 * Initialization564 */565 566static int hgafb_probe(struct platform_device *pdev)567{568 struct fb_info *info;569 int ret;570 571 ret = hga_card_detect();572 if (ret)573 return ret;574 575 printk(KERN_INFO "hgafb: %s with %ldK of memory detected.\n",576 hga_type_name, hga_vram_len/1024);577 578 info = framebuffer_alloc(0, &pdev->dev);579 if (!info) {580 iounmap(hga_vram);581 return -ENOMEM;582 }583 584 hga_fix.smem_start = (unsigned long)hga_vram;585 hga_fix.smem_len = hga_vram_len;586 587 info->flags = FBINFO_HWACCEL_YPAN;588 info->var = hga_default_var;589 info->fix = hga_fix;590 info->monspecs.hfmin = 0;591 info->monspecs.hfmax = 0;592 info->monspecs.vfmin = 10000;593 info->monspecs.vfmax = 10000;594 info->monspecs.dpms = 0;595 info->fbops = &hgafb_ops;596 info->screen_base = hga_vram;597 598 if (register_framebuffer(info) < 0) {599 framebuffer_release(info);600 iounmap(hga_vram);601 return -EINVAL;602 }603 604 fb_info(info, "%s frame buffer device\n", info->fix.id);605 platform_set_drvdata(pdev, info);606 return 0;607}608 609static void hgafb_remove(struct platform_device *pdev)610{611 struct fb_info *info = platform_get_drvdata(pdev);612 613 hga_txt_mode();614 hga_clear_screen();615 616 if (info) {617 unregister_framebuffer(info);618 framebuffer_release(info);619 }620 621 iounmap(hga_vram);622 623 if (release_io_ports)624 release_region(0x3b0, 12);625 626 if (release_io_port)627 release_region(0x3bf, 1);628}629 630static struct platform_driver hgafb_driver = {631 .probe = hgafb_probe,632 .remove = hgafb_remove,633 .driver = {634 .name = "hgafb",635 },636};637 638static struct platform_device *hgafb_device;639 640static int __init hgafb_init(void)641{642 int ret;643 644 if (fb_get_options("hgafb", NULL))645 return -ENODEV;646 647 ret = platform_driver_register(&hgafb_driver);648 649 if (!ret) {650 hgafb_device = platform_device_register_simple("hgafb", 0, NULL, 0);651 652 if (IS_ERR(hgafb_device)) {653 platform_driver_unregister(&hgafb_driver);654 ret = PTR_ERR(hgafb_device);655 }656 }657 658 return ret;659}660 661static void __exit hgafb_exit(void)662{663 platform_device_unregister(hgafb_device);664 platform_driver_unregister(&hgafb_driver);665}666 667/* -------------------------------------------------------------------------668 *669 * Modularization670 *671 * ------------------------------------------------------------------------- */672 673MODULE_AUTHOR("Ferenc Bakonyi <fero@drama.obuda.kando.hu>");674MODULE_DESCRIPTION("FBDev driver for Hercules Graphics Adaptor");675MODULE_LICENSE("GPL");676 677module_param(nologo, bool, 0);678MODULE_PARM_DESC(nologo, "Disables startup logo if != 0 (default=0)");679module_init(hgafb_init);680module_exit(hgafb_exit);681