diff options
Diffstat (limited to 'drivers/video/hgafb.c')
| -rw-r--r-- | drivers/video/hgafb.c | 762 |
1 files changed, 762 insertions, 0 deletions
diff --git a/drivers/video/hgafb.c b/drivers/video/hgafb.c new file mode 100644 index 000000000..bffa6b02e --- /dev/null +++ b/drivers/video/hgafb.c @@ -0,0 +1,762 @@ +/* + * linux/drivers/video/hgafb.c -- Hercules graphics adaptor frame buffer device + * + * Created 25 Nov 1999 by Ferenc Bakonyi (fero@drama.obuda.kando.hu) + * Based on skeletonfb.c by Geert Uytterhoeven and + * mdacon.c by Andrew Apted + * + * History: + * + * - Revision 0.1.4 (24 Jan 2000): fixed a bug in hga_card_detect() for + * HGA-only systems + * - Revision 0.1.3 (22 Jan 2000): modified for the new fb_info structure + * screen is cleared after rmmod + * virtual resolutions + * kernel parameter 'video=hga:font:{fontname}' + * module parameter 'font={fontname}' + * module parameter 'nologo={0|1}' + * the most important: boot logo :) + * - Revision 0.1.0 (6 Dec 1999): faster scrolling and minor fixes + * - First release (25 Nov 1999) + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive + * for more details. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/mm.h> +#include <linux/tty.h> +#include <linux/malloc.h> +#include <linux/delay.h> +#include <linux/fb.h> +#include <linux/init.h> +#include <linux/ioport.h> +#include <asm/io.h> +#include <asm/vga.h> +#include <video/fbcon.h> +#include <video/fbcon-hga.h> + +#ifdef MODULE + +#define INCLUDE_LINUX_LOGOBW +#include <linux/linux_logo.h> + +#endif /* MODULE */ + +#if 0 +#define DPRINTK(args...) printk(KERN_DEBUG __FILE__": " ##args) +#else +#define DPRINTK(args...) +#endif + +#if 1 +#define CHKINFO(ret) if (info != &fb_info) { printk(KERN_DEBUG __FILE__": This should never happen, line:%d \n", __LINE__); return ret; } +#else +#define CHKINFO(ret) +#endif + +/* Description of the hardware layout */ + +static unsigned long hga_vram_base; /* Base of video memory */ +static unsigned long hga_vram_len; /* Size of video memory */ + +#define HGA_TXT 0 +#define HGA_GFX 1 + +static int hga_mode = -1; /* 0 = txt, 1 = gfx mode */ + +static enum { TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } hga_type; +static char *hga_type_name; + +#define HGA_INDEX_PORT 0x3b4 /* Register select port */ +#define HGA_VALUE_PORT 0x3b5 /* Register value port */ +#define HGA_MODE_PORT 0x3b8 /* Mode control port */ +#define HGA_STATUS_PORT 0x3ba /* Status and Config port */ +#define HGA_GFX_PORT 0x3bf /* Graphics control port */ + +/* HGA register values */ + +#define HGA_CURSOR_BLINKING 0x00 +#define HGA_CURSOR_OFF 0x20 +#define HGA_CURSOR_SLOWBLINK 0x60 + +#define HGA_MODE_GRAPHICS 0x02 +#define HGA_MODE_VIDEO_EN 0x08 +#define HGA_MODE_BLINK_EN 0x20 +#define HGA_MODE_GFX_PAGE1 0x80 + +#define HGA_STATUS_HSYNC 0x01 +#define HGA_STATUS_VSYNC 0x80 +#define HGA_STATUS_VIDEO 0x08 + +#define HGA_CONFIG_COL132 0x08 +#define HGA_GFX_MODE_EN 0x01 +#define HGA_GFX_PAGE_EN 0x02 + +/* Framebuffer driver structures */ + +static struct fb_var_screeninfo hga_default_var = { + 720, 348, /* xres, yres */ + 720, 348, /* xres_virtual, yres_virtual */ + 0, 0, /* xoffset, yoffset */ + 1, /* bits_per_pixel */ + 0, /* grayscale */ + {0, 1, 0}, /* red */ + {0, 1, 0}, /* green */ + {0, 1, 0}, /* blue */ + {0, 0, 0}, /* transp */ + 0, /* nonstd (FB_NONSTD_HGA ?) */ + 0, /* activate */ + -1, -1, /* height, width */ + 0, /* accel_flags */ + /* pixclock */ + /* left_margin, right_margin */ + /* upper_margin, lower_margin */ + /* hsync_len, vsync_len */ + /* sync */ + /* vmode */ +}; + +static struct fb_fix_screeninfo hga_fix = { + "HGA", /* id */ + (unsigned long) NULL, /* smem_start */ + 0, /* smem_len */ + FB_TYPE_PACKED_PIXELS, /* type (not sure) */ + 0, /* type_aux (not sure) */ + FB_VISUAL_MONO10, /* visual */ + 8, /* xpanstep */ + 8, /* ypanstep */ + 0, /* ywrapstep */ + 90, /* line_length */ + 0, /* mmio_start */ + 0, /* mmio_len */ + FB_ACCEL_NONE /* accel */ +}; + +static struct fb_info fb_info; +static struct display disp; + +/* Don't assume that tty1 will be the initial current console. */ +static int currcon = -1; +static int release_io_port = 0; +static int release_io_ports = 0; + +#ifdef MODULE +static char *font = NULL; +static int nologo = 0; +#endif + +/* ------------------------------------------------------------------------- + * + * Low level hardware functions + * + * ------------------------------------------------------------------------- */ + +static void write_hga_b(unsigned int val, unsigned char reg) +{ + unsigned long flags; + + save_flags(flags); cli(); + + outb_p(reg, HGA_INDEX_PORT); + outb_p(val, HGA_VALUE_PORT); + + restore_flags(flags); +} + +static void write_hga_w(unsigned int val, unsigned char reg) +{ + unsigned long flags; + + save_flags(flags); cli(); + + outb_p(reg, HGA_INDEX_PORT); outb_p(val >> 8, HGA_VALUE_PORT); + outb_p(reg+1, HGA_INDEX_PORT); outb_p(val & 0xff, HGA_VALUE_PORT); + + restore_flags(flags); +} + +static int test_hga_b(unsigned char val, unsigned char reg) +{ + unsigned long flags; + + save_flags(flags); cli(); + + outb_p(reg, HGA_INDEX_PORT); + outb (val, HGA_VALUE_PORT); + + udelay(20); val = (inb_p(HGA_VALUE_PORT) == val); + + restore_flags(flags); + + return val; +} + +static void hga_clear_screen(void) +{ + if (hga_mode == HGA_TXT) + memset((char *)hga_vram_base, ' ', hga_vram_len); + else if (hga_mode == HGA_GFX) + memset((char *)hga_vram_base, 0, hga_vram_len); +} + + +static void hga_txt_mode(void) +{ + outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_BLINK_EN, HGA_MODE_PORT); + outb_p(0x00, HGA_GFX_PORT); + outb_p(0x00, HGA_STATUS_PORT); + + write_hga_b(0x61, 0x00); /* horizontal total */ + write_hga_b(0x50, 0x01); /* horizontal displayed */ + write_hga_b(0x52, 0x02); /* horizontal sync pos */ + write_hga_b(0x0f, 0x03); /* horizontal sync width */ + + write_hga_b(0x19, 0x04); /* vertical total */ + write_hga_b(0x06, 0x05); /* vertical total adjust */ + write_hga_b(0x19, 0x06); /* vertical displayed */ + write_hga_b(0x19, 0x07); /* vertical sync pos */ + + write_hga_b(0x02, 0x08); /* interlace mode */ + write_hga_b(0x0d, 0x09); /* maximum scanline */ + write_hga_b(0x0c, 0x0a); /* cursor start */ + write_hga_b(0x0d, 0x0b); /* cursor end */ + + write_hga_w(0x0000, 0x0c); /* start address */ + write_hga_w(0x0000, 0x0e); /* cursor location */ + + hga_mode = HGA_TXT; +} + +static void hga_gfx_mode(void) +{ + outb_p(0x00, HGA_STATUS_PORT); + outb_p(HGA_GFX_MODE_EN, HGA_GFX_PORT); + outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_GRAPHICS, HGA_MODE_PORT); + + write_hga_b(0x35, 0x00); /* horizontal total */ + write_hga_b(0x2d, 0x01); /* horizontal displayed */ + write_hga_b(0x2e, 0x02); /* horizontal sync pos */ + write_hga_b(0x07, 0x03); /* horizontal sync width */ + + write_hga_b(0x5b, 0x04); /* vertical total */ + write_hga_b(0x02, 0x05); /* vertical total adjust */ + write_hga_b(0x57, 0x06); /* vertical displayed */ + write_hga_b(0x57, 0x07); /* vertical sync pos */ + + write_hga_b(0x02, 0x08); /* interlace mode */ + write_hga_b(0x03, 0x09); /* maximum scanline */ + write_hga_b(0x00, 0x0a); /* cursor start */ + write_hga_b(0x00, 0x0b); /* cursor end */ + + write_hga_w(0x0000, 0x0c); /* start address */ + write_hga_w(0x0000, 0x0e); /* cursor location */ + + hga_mode = HGA_GFX; +} + +#ifdef MODULE +static void hga_show_logo(void) +{ + int x, y; + char *dest = (char *)hga_vram_base; + char *logo = linux_logo_bw; + for (y = 134; y < 134 + 80 ; y++) /* this needs some cleanup */ + for (x = 0; x < 10 ; x++) + *(dest + (y%4)*8192 + (y>>2)*90 + x + 40) = ~*(logo++); +} +#endif /* MODULE */ + +static void hga_pan(unsigned int xoffset, unsigned int yoffset) +{ + unsigned int base; + base = (yoffset / 8) * 90 + xoffset; + write_hga_w(base, 0x0c); /* start address */ + DPRINTK("hga_pan: base:%d\n", base); +} + +static int hga_card_detect(void) +{ + int count=0; + u16 *p, p_save; + u16 *q, q_save; + + hga_vram_base = VGA_MAP_MEM(0xb0000); + hga_vram_len = 0x08000; + + if (!request_mem_region(hga_vram_base, hga_vram_len, "hgafb")) { + printk(KERN_ERR "hgafb: cannot reserve video memory at 0x%lX\n", + hga_vram_base); + return 0; + } + if (request_region(0x3b0, 12, "hgafb")) + release_io_ports = 1; + if (request_region(0x3bf, 1, "hgafb")) + release_io_port = 1; + + /* do a memory check */ + + p = (u16 *) hga_vram_base; + q = (u16 *) (hga_vram_base + 0x01000); + + p_save = scr_readw(p); q_save = scr_readw(q); + + scr_writew(0xaa55, p); if (scr_readw(p) == 0xaa55) count++; + scr_writew(0x55aa, p); if (scr_readw(p) == 0x55aa) count++; + scr_writew(p_save, p); + + if (count != 2) { + return 0; + } + + /* Ok, there is definitely a card registering at the correct + * memory location, so now we do an I/O port test. + */ + + if (!test_hga_b(0x66, 0x0f)) { /* cursor low register */ + return 0; + } + if (!test_hga_b(0x99, 0x0f)) { /* cursor low register */ + return 0; + } + + /* See if the card is a Hercules, by checking whether the vsync + * bit of the status register is changing. This test lasts for + * approximately 1/10th of a second. + */ + + p_save = q_save = inb_p(HGA_STATUS_PORT) & HGA_STATUS_VSYNC; + + for (count=0; count < 50000 && p_save == q_save; count++) { + q_save = inb(HGA_STATUS_PORT) & HGA_STATUS_VSYNC; + udelay(2); + } + + if (p_save != q_save) { + switch (inb_p(HGA_STATUS_PORT) & 0x70) { + case 0x10: + hga_type = TYPE_HERCPLUS; + hga_type_name = "HerculesPlus"; + break; + case 0x50: + hga_type = TYPE_HERCCOLOR; + hga_type_name = "HerculesColor"; + break; + default: + hga_type = TYPE_HERC; + hga_type_name = "Hercules"; + break; + } + } + return 1; +} + +/* ------------------------------------------------------------------------- * + * + * dispsw functions + * + * ------------------------------------------------------------------------- */ + + + /* + * Open/Release the frame buffer device + */ + +static int hgafb_open(struct fb_info *info, int user) +{ + /* Nothing, only a usage count for the moment */ + MOD_INC_USE_COUNT; + return 0; +} + +static int hgafb_release(struct fb_info *info, int user) +{ + MOD_DEC_USE_COUNT; + return 0; +} + + + /* + * Get the Fixed Part of the Display + */ + +int hga_get_fix(struct fb_fix_screeninfo *fix, int con, struct fb_info *info) +{ + CHKINFO(-EINVAL); + DPRINTK("hga_get_fix: con:%d, info:%x, fb_info:%x\n", con, (unsigned)info, (unsigned)&fb_info); + + *fix = info->fix; + return 0; +} + + + /* + * Get the User Defined Part of the Display + */ + +int hga_get_var(struct fb_var_screeninfo *var, int con, struct fb_info *info) +{ + CHKINFO(-EINVAL); + DPRINTK("hga_get_var: con:%d, info:%x, fb_info:%x\n", con, (unsigned)info, (unsigned)&fb_info); + + *var = info->var; + return 0; +} + + /* + * Set the User Defined Part of the Display + * This is the most mystical function (at least for me). + * What is the exact specification of xxx_set_var? + * Should it handle xoffset, yoffset? Should it do pannig? + * What does vmode mean? + */ + +int hga_set_var(struct fb_var_screeninfo *var, int con, struct fb_info *info) +{ + CHKINFO(-EINVAL); + DPRINTK("hga_set_var: con:%d, activate:%x, info:0x%x, fb_info:%x\n", con, var->activate, (unsigned)info, (unsigned)&fb_info); + + if (var->xres != 720 || var->yres != 348 || + var->xres_virtual != 720 || + var->yres_virtual < 348 || var->yres_virtual > 348 + 16 || + var->bits_per_pixel != 1 || var->grayscale != 0) { + return -EINVAL; + } + if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) { + info->var = *var; + if (info->changevar) + (*info->changevar)(con); + } + return 0; +} + + + /* + * Get the Colormap + */ + +static int hga_getcolreg(u_int regno, u_int *red, u_int *green, u_int *blue, + u_int *transp, struct fb_info *info) +{ + if (regno == 0) { + *red = *green = *blue = 0x0000; + *transp = 0; + } else if (regno == 1) { + *red = *green = *blue = 0xaaaa; + *transp = 0; + } else + return 1; + return 0; +} + +int hga_get_cmap(struct fb_cmap *cmap, int kspc, int con, + struct fb_info *info) +{ + CHKINFO(-EINVAL); + DPRINTK("hga_get_cmap: con:%d\n", con); + return fb_get_cmap(cmap, kspc, hga_getcolreg, info); +} + + /* + * Set the Colormap + */ + +static int hga_setcolreg(u_int regno, u_int red, u_int green, u_int blue, + u_int transp, struct fb_info *info) +{ + if (regno > 1) + return 1; + return 0; +} + +int hga_set_cmap(struct fb_cmap *cmap, int kspc, int con, + struct fb_info *info) +{ + CHKINFO(-EINVAL); + DPRINTK("hga_set_cmap: con:%d\n", con); + return fb_set_cmap(cmap, kspc, hga_setcolreg, info); +} + + /* + * Pan or Wrap the Display + * + * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag + */ + +int hga_pan_display(struct fb_var_screeninfo *var, int con, + struct fb_info *info) +{ + CHKINFO(-EINVAL); + DPRINTK("pan_disp: con:%d, wrap:%d, xoff:%d, yoff:%d\n", con, var->vmode & FB_VMODE_YWRAP, var->xoffset, var->yoffset); + + if (var->vmode & FB_VMODE_YWRAP) { + if (var->yoffset < 0 || + var->yoffset >= info->var.yres_virtual || + var->xoffset) + return -EINVAL; + } else { + if (var->xoffset + var->xres > info->var.xres_virtual + || var->yoffset + var->yres > info->var.yres_virtual + || var->yoffset % 8) + return -EINVAL; + } + + hga_pan(var->xoffset, var->yoffset); + + info->var.xoffset = var->xoffset; + info->var.yoffset = var->yoffset; + if (var->vmode & FB_VMODE_YWRAP) + info->var.vmode |= FB_VMODE_YWRAP; + else + info->var.vmode &= ~FB_VMODE_YWRAP; + return 0; +} + + + /* + * Frame Buffer Specific ioctls + */ + +int hga_ioctl(struct inode *inode, struct file *file, unsigned int cmd, + unsigned long arg, int con, struct fb_info *info) +{ + CHKINFO(-EINVAL); + DPRINTK("hga_ioctl: con:%d\n", con); + return -EINVAL; +} + + + + +static struct fb_ops hgafb_ops = { + hgafb_open, hgafb_release, hga_get_fix, hga_get_var, hga_set_var, + hga_get_cmap, hga_set_cmap, hga_pan_display, hga_ioctl +}; + + +/* ------------------------------------------------------------------------- * + * + * Functions in fb_info + * + * ------------------------------------------------------------------------- */ + +static int hgafbcon_switch(int con, struct fb_info *info) +{ + CHKINFO(-EINVAL); + DPRINTK("hgafbcon_switch: currcon:%d, con:%d, info:%x, fb_info:%x\n", currcon, con, (unsigned)info, (unsigned)&fb_info); + + /* Save the colormap and video mode */ +#if 0 /* Not necessary in hgafb, we use fixed colormap */ + fb_copy_cmap(&info->cmap, &fb_display[currcon].cmap, 0); +#endif + + if (currcon != -1) /* this check is absolute necessary! */ + memcpy(&fb_display[currcon].var, &info->var, + sizeof(struct fb_var_screeninfo)); + + /* Install a new colormap and change the video mode. By default fbcon + * sets all the colormaps and video modes to the default values at + * bootup. + */ +#if 0 + fb_copy_cmap(&fb_display[con].cmap, &info->cmap, 0); + fb_set_cmap(&info->cmap, 1, hga_setcolreg, info); +#endif + + memcpy(&info->var, &fb_display[con].var, + sizeof(struct fb_var_screeninfo)); + /* hga_set_var(&info->var, con, &fb_info); is it necessary? */ + currcon = con; + + /* Hack to work correctly with XF86_Mono */ + hga_gfx_mode(); + return 0; +} + +static int hgafbcon_updatevar(int con, struct fb_info *info) +{ + CHKINFO(-EINVAL); + DPRINTK("hga_update_var: con:%d, info:%x, fb_info:%x\n", con, (unsigned)info, (unsigned)&fb_info); + return (con < 0) ? -EINVAL : hga_pan_display(&fb_display[con].var, con, info); +} + +static void hgafbcon_blank(int blank_mode, struct fb_info *info) +{ + /* + * Blank the screen if blank_mode != 0, else unblank. + * Implements VESA suspend and powerdown modes on hardware + * that supports disabling hsync/vsync: + * blank_mode == 2: suspend vsync + * blank_mode == 3: suspend hsync + * blank_mode == 4: powerdown + */ + + CHKINFO( ); + DPRINTK("hga_blank: blank_mode:%d, info:%x, fb_info:%x\n", blank_mode, (unsigned)info, (unsigned)&fb_info); + + if (blank_mode) { + outb_p(0x00, HGA_MODE_PORT); /* disable video */ + } else { + outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_GRAPHICS, HGA_MODE_PORT); + } +} + + +/* ------------------------------------------------------------------------- */ + + /* + * Initialization + */ + +int __init hgafb_init(void) +{ + if (! hga_card_detect()) { + printk(KERN_ERR "hgafb: HGA card not detected.\n"); + return -EINVAL; + } + + printk(KERN_INFO "hgafb: %s with %ldK of memory detected.\n", + hga_type_name, hga_vram_len/1024); + + hga_gfx_mode(); + hga_clear_screen(); +#ifdef MODULE + if (!nologo) hga_show_logo(); +#endif /* MODULE */ + + hga_fix.smem_start = hga_vram_base; + hga_fix.smem_len = hga_vram_len; + + disp.var = hga_default_var; +/* disp.cmap = ???; */ + disp.screen_base = (char*)hga_fix.smem_start; + disp.visual = hga_fix.visual; + disp.type = hga_fix.type; + disp.type_aux = hga_fix.type_aux; + disp.ypanstep = hga_fix.ypanstep; + disp.ywrapstep = hga_fix.ywrapstep; + disp.line_length = hga_fix.line_length; + disp.can_soft_blank = 1; + disp.inverse = 0; + disp.dispsw = &fbcon_hga; + disp.dispsw_data = NULL; + + disp.scrollmode = SCROLL_YREDRAW; + + strcpy (fb_info.modename, hga_fix.id); + fb_info.node = -1; + fb_info.flags = FBINFO_FLAG_DEFAULT; +/* fb_info.open = ??? */ + fb_info.var = hga_default_var; + fb_info.fix = hga_fix; + fb_info.monspecs.hfmin = 0; + fb_info.monspecs.hfmax = 0; + fb_info.monspecs.vfmin = 10000; + fb_info.monspecs.vfmax = 10000; + fb_info.monspecs.dpms = 0; + fb_info.fbops = &hgafb_ops; + fb_info.screen_base = (char *)hga_fix.smem_start; + fb_info.disp = &disp; +/* fb_info.display_fg = ??? */ +/* fb_info.fontname initialized later */ + fb_info.changevar = NULL; + fb_info.switch_con = hgafbcon_switch; + fb_info.updatevar = hgafbcon_updatevar; + fb_info.blank = hgafbcon_blank; + fb_info.pseudo_palette = NULL; /* ??? */ + fb_info.par = NULL; + + if (register_framebuffer(&fb_info) < 0) + return -EINVAL; + + printk(KERN_INFO "fb%d: %s frame buffer device\n", + GET_FB_IDX(fb_info.node), fb_info.modename); + + return 0; +} + + /* + * Setup + */ + +#ifndef MODULE +int __init hgafb_setup(char *options) +{ + /* + * Parse user speficied options + * `video=hga:font:VGA8x16' or + * `video=hga:font:SUN8x16' recommended + * Other supported fonts: VGA8x8, Acorn8x8, PEARL8x8 + * More different fonts can be used with the `setfont' utility. + */ + + char *this_opt; + + fb_info.fontname[0] = '\0'; + + if (!options || !*options) + return 0; + + for (this_opt = strtok(options, ","); this_opt; + this_opt = strtok(NULL, ",")) { + if (!strncmp(this_opt, "font:", 5)) + strcpy(fb_info.fontname, this_opt+5); + } + return 0; +} +#endif /* !MODULE */ + + + /* + * Cleanup + */ + +#ifdef MODULE +static void hgafb_cleanup(struct fb_info *info) +{ + hga_txt_mode(); + hga_clear_screen(); + unregister_framebuffer(info); + if (release_io_ports) release_region(0x3b0, 12); + if (release_io_port) release_region(0x3bf, 1); + release_mem_region(hga_vram_base, hga_vram_len); +} +#endif /* MODULE */ + + + +/* ------------------------------------------------------------------------- + * + * Modularization + * + * ------------------------------------------------------------------------- */ + +#ifdef MODULE +int init_module(void) +{ + if (font) + strncpy(fb_info.fontname, font, sizeof(fb_info.fontname)-1); + else + fb_info.fontname[0] = '\0'; + + return hgafb_init(); +} + +void cleanup_module(void) +{ + hgafb_cleanup(&fb_info); +} + +MODULE_AUTHOR("Ferenc Bakonyi (fero@drama.obuda.kando.hu)"); +MODULE_DESCRIPTION("FBDev driver for Hercules Graphics Adaptor"); + +MODULE_PARM(font, "s"); +MODULE_PARM_DESC(font, "Specifies one of the compiled-in fonts (VGA8x8, VGA8x16, SUN8x16, Acorn8x8, PEARL8x8) (default=none)"); +MODULE_PARM(nologo, "i"); +MODULE_PARM_DESC(nologo, "Disables startup logo if != 0 (default=0)"); + +#endif /* MODULE */ |