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linux/drivers/video/hgafb.c

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/*
* 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 0.1.8 (23 Oct 2002): Ported to new framebuffer api.
*
* - Revision 0.1.7 (23 Jan 2001): fix crash resulting from MDA only cards
* being detected as Hercules. (Paul G.)
* - Revision 0.1.6 (17 Aug 2000): new style structs
* documentation
* - Revision 0.1.5 (13 Mar 2000): spinlocks instead of saveflags();cli();etc
* minor fixes
* - 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
* 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/spinlock.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/platform_device.h>
#include <asm/io.h>
#include <asm/vga.h>
#if 0
#define DPRINTK(args...) printk(KERN_DEBUG __FILE__": " ##args)
#else
#define DPRINTK(args...)
#endif
#if 0
#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 void __iomem *hga_vram; /* Base of video memory */
static unsigned long hga_vram_len; /* Size of video memory */
#define HGA_ROWADDR(row) ((row%4)*8192 + (row>>2)*90)
#define HGA_TXT 0
#define HGA_GFX 1
static inline u8 __iomem * rowaddr(struct fb_info *info, u_int row)
{
return info->screen_base + HGA_ROWADDR(row);
}
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
/* Global locks */
static DEFINE_SPINLOCK(hga_reg_lock);
/* Framebuffer driver structures */
static struct fb_var_screeninfo __initdata hga_default_var = {
.xres = 720,
.yres = 348,
.xres_virtual = 720,
.yres_virtual = 348,
.bits_per_pixel = 1,
.red = {0, 1, 0},
.green = {0, 1, 0},
.blue = {0, 1, 0},
.transp = {0, 0, 0},
.height = -1,
.width = -1,
};
static struct fb_fix_screeninfo __initdata hga_fix = {
.id = "HGA",
.type = FB_TYPE_PACKED_PIXELS, /* (not sure) */
.visual = FB_VISUAL_MONO10,
.xpanstep = 8,
.ypanstep = 8,
.line_length = 90,
.accel = FB_ACCEL_NONE
};
/* Don't assume that tty1 will be the initial current console. */
static int release_io_port = 0;
static int release_io_ports = 0;
static int nologo = 0;
/* -------------------------------------------------------------------------
*
* Low level hardware functions
*
* ------------------------------------------------------------------------- */
static void write_hga_b(unsigned int val, unsigned char reg)
{
outb_p(reg, HGA_INDEX_PORT);
outb_p(val, HGA_VALUE_PORT);
}
static void write_hga_w(unsigned int val, unsigned char reg)
{
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);
}
static int test_hga_b(unsigned char val, unsigned char reg)
{
outb_p(reg, HGA_INDEX_PORT);
outb (val, HGA_VALUE_PORT);
udelay(20); val = (inb_p(HGA_VALUE_PORT) == val);
return val;
}
static void hga_clear_screen(void)
{
unsigned char fillchar = 0xbf; /* magic */
unsigned long flags;
spin_lock_irqsave(&hga_reg_lock, flags);
if (hga_mode == HGA_TXT)
fillchar = ' ';
else if (hga_mode == HGA_GFX)
fillchar = 0x00;
spin_unlock_irqrestore(&hga_reg_lock, flags);
if (fillchar != 0xbf)
memset_io(hga_vram, fillchar, hga_vram_len);
}
static void hga_txt_mode(void)
{
unsigned long flags;
spin_lock_irqsave(&hga_reg_lock, flags);
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;
spin_unlock_irqrestore(&hga_reg_lock, flags);
}
static void hga_gfx_mode(void)
{
unsigned long flags;
spin_lock_irqsave(&hga_reg_lock, flags);
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;
spin_unlock_irqrestore(&hga_reg_lock, flags);
}
static void hga_show_logo(struct fb_info *info)
{
/*
void __iomem *dest = hga_vram;
char *logo = linux_logo_bw;
int x, y;
for (y = 134; y < 134 + 80 ; y++) * this needs some cleanup *
for (x = 0; x < 10 ; x++)
writeb(~*(logo++),(dest + HGA_ROWADDR(y) + x + 40));
*/
}
static void hga_pan(unsigned int xoffset, unsigned int yoffset)
{
unsigned int base;
unsigned long flags;
base = (yoffset / 8) * 90 + xoffset;
spin_lock_irqsave(&hga_reg_lock, flags);
write_hga_w(base, 0x0c); /* start address */
spin_unlock_irqrestore(&hga_reg_lock, flags);
DPRINTK("hga_pan: base:%d\n", base);
}
static void hga_blank(int blank_mode)
{
unsigned long flags;
spin_lock_irqsave(&hga_reg_lock, flags);
if (blank_mode) {
outb_p(0x00, HGA_MODE_PORT); /* disable video */
} else {
outb_p(HGA_MODE_VIDEO_EN | HGA_MODE_GRAPHICS, HGA_MODE_PORT);
}
spin_unlock_irqrestore(&hga_reg_lock, flags);
}
static int __init hga_card_detect(void)
{
int count = 0;
void __iomem *p, *q;
unsigned short p_save, q_save;
hga_vram_len = 0x08000;
hga_vram = ioremap(0xb0000, hga_vram_len);
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 = hga_vram;
q = hga_vram + 0x01000;
p_save = readw(p); q_save = readw(q);
writew(0xaa55, p); if (readw(p) == 0xaa55) count++;
writew(0x55aa, p); if (readw(p) == 0x55aa) count++;
writew(p_save, p);
if (count != 2)
goto error;
/* 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 */
goto error;
if (!test_hga_b(0x99, 0x0f)) /* cursor low register */
goto error;
/* 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)
goto error;
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;
error:
if (release_io_ports)
release_region(0x3b0, 12);
if (release_io_port)
release_region(0x3bf, 1);
return 0;
}
/**
* hgafb_open - open the framebuffer device
* @info:pointer to fb_info object containing info for current hga board
* @int:open by console system or userland.
*/
static int hgafb_open(struct fb_info *info, int init)
{
hga_gfx_mode();
hga_clear_screen();
if (!nologo) hga_show_logo(info);
return 0;
}
/**
* hgafb_open - open the framebuffer device
* @info:pointer to fb_info object containing info for current hga board
* @int:open by console system or userland.
*/
static int hgafb_release(struct fb_info *info, int init)
{
hga_txt_mode();
hga_clear_screen();
return 0;
}
/**
* hgafb_setcolreg - set color registers
* @regno:register index to set
* @red:red value, unused
* @green:green value, unused
* @blue:blue value, unused
* @transp:transparency value, unused
* @info:unused
*
* This callback function is used to set the color registers of a HGA
* board. Since we have only two fixed colors only @regno is checked.
* A zero is returned on success and 1 for failure.
*/
static int hgafb_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;
}
/**
* hga_pan_display - pan or wrap the display
* @var:contains new xoffset, yoffset and vmode values
* @info:pointer to fb_info object containing info for current hga board
*
* This function looks only at xoffset, yoffset and the %FB_VMODE_YWRAP
* flag in @var. If input parameters are correct it calls hga_pan() to
* program the hardware. @info->var is updated to the new values.
* A zero is returned on success and %-EINVAL for failure.
*/
static int hgafb_pan_display(struct fb_var_screeninfo *var,
struct fb_info *info)
{
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);
return 0;
}
/**
* hgafb_blank - (un)blank the screen
* @blank_mode:blanking method to use
* @info:unused
*
* 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 means suspend vsync,
* @blank_mode == 3 means suspend hsync,
* @blank_mode == 4 means powerdown.
*/
static int hgafb_blank(int blank_mode, struct fb_info *info)
{
hga_blank(blank_mode);
return 0;
}
/*
* Accel functions
*/
#ifdef CONFIG_FB_HGA_ACCEL
static void hgafb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
{
u_int rows, y;
u8 __iomem *dest;
y = rect->dy;
for (rows = rect->height; rows--; y++) {
dest = rowaddr(info, y) + (rect->dx >> 3);
switch (rect->rop) {
case ROP_COPY:
//fb_memset(dest, rect->color, (rect->width >> 3));
break;
case ROP_XOR:
fb_writeb(~(fb_readb(dest)), dest);
break;
}
}
}
static void hgafb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
{
u_int rows, y1, y2;
u8 __iomem *src;
u8 __iomem *dest;
if (area->dy <= area->sy) {
y1 = area->sy;
y2 = area->dy;
for (rows = area->height; rows--; ) {
src = rowaddr(info, y1) + (area->sx >> 3);
dest = rowaddr(info, y2) + (area->dx >> 3);
//fb_memmove(dest, src, (area->width >> 3));
y1++;
y2++;
}
} else {
y1 = area->sy + area->height - 1;
y2 = area->dy + area->height - 1;
for (rows = area->height; rows--;) {
src = rowaddr(info, y1) + (area->sx >> 3);
dest = rowaddr(info, y2) + (area->dx >> 3);
//fb_memmove(dest, src, (area->width >> 3));
y1--;
y2--;
}
}
}
static void hgafb_imageblit(struct fb_info *info, const struct fb_image *image)
{
u8 __iomem *dest;
u8 *cdat = (u8 *) image->data;
u_int rows, y = image->dy;
u8 d;
for (rows = image->height; rows--; y++) {
d = *cdat++;
dest = rowaddr(info, y) + (image->dx >> 3);
fb_writeb(d, dest);
}
}
#else /* !CONFIG_FB_HGA_ACCEL */
#define hgafb_fillrect cfb_fillrect
#define hgafb_copyarea cfb_copyarea
#define hgafb_imageblit cfb_imageblit
#endif /* CONFIG_FB_HGA_ACCEL */
static struct fb_ops hgafb_ops = {
.owner = THIS_MODULE,
.fb_open = hgafb_open,
.fb_release = hgafb_release,
.fb_setcolreg = hgafb_setcolreg,
.fb_pan_display = hgafb_pan_display,
.fb_blank = hgafb_blank,
.fb_fillrect = hgafb_fillrect,
.fb_copyarea = hgafb_copyarea,
.fb_imageblit = hgafb_imageblit,
};
/* ------------------------------------------------------------------------- *
*
* Functions in fb_info
*
* ------------------------------------------------------------------------- */
/* ------------------------------------------------------------------------- */
/*
* Initialization
*/
static int __init hgafb_probe(struct platform_device *pdev)
{
struct fb_info *info;
if (! hga_card_detect()) {
printk(KERN_INFO "hgafb: HGA card not detected.\n");
if (hga_vram)
iounmap(hga_vram);
return -EINVAL;
}
printk(KERN_INFO "hgafb: %s with %ldK of memory detected.\n",
hga_type_name, hga_vram_len/1024);
info = framebuffer_alloc(0, &pdev->dev);
if (!info) {
iounmap(hga_vram);
return -ENOMEM;
}
hga_fix.smem_start = (unsigned long)hga_vram;
hga_fix.smem_len = hga_vram_len;
info->flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN;
info->var = hga_default_var;
info->fix = hga_fix;
info->monspecs.hfmin = 0;
info->monspecs.hfmax = 0;
info->monspecs.vfmin = 10000;
info->monspecs.vfmax = 10000;
info->monspecs.dpms = 0;
info->fbops = &hgafb_ops;
info->screen_base = hga_vram;
if (register_framebuffer(info) < 0) {
framebuffer_release(info);
iounmap(hga_vram);
return -EINVAL;
}
printk(KERN_INFO "fb%d: %s frame buffer device\n",
info->node, info->fix.id);
platform_set_drvdata(pdev, info);
return 0;
}
static int hgafb_remove(struct platform_device *pdev)
{
struct fb_info *info = platform_get_drvdata(pdev);
hga_txt_mode();
hga_clear_screen();
if (info) {
unregister_framebuffer(info);
framebuffer_release(info);
}
iounmap(hga_vram);
if (release_io_ports)
release_region(0x3b0, 12);
if (release_io_port)
release_region(0x3bf, 1);
return 0;
}
static struct platform_driver hgafb_driver = {
.probe = hgafb_probe,
.remove = hgafb_remove,
.driver = {
.name = "hgafb",
},
};
static struct platform_device *hgafb_device;
static int __init hgafb_init(void)
{
int ret;
if (fb_get_options("hgafb", NULL))
return -ENODEV;
ret = platform_driver_register(&hgafb_driver);
if (!ret) {
hgafb_device = platform_device_register_simple("hgafb", 0, NULL, 0);
if (IS_ERR(hgafb_device)) {
platform_driver_unregister(&hgafb_driver);
ret = PTR_ERR(hgafb_device);
}
}
return ret;
}
static void __exit hgafb_exit(void)
{
platform_device_unregister(hgafb_device);
platform_driver_unregister(&hgafb_driver);
}
/* -------------------------------------------------------------------------
*
* Modularization
*
* ------------------------------------------------------------------------- */
MODULE_AUTHOR("Ferenc Bakonyi (fero@drama.obuda.kando.hu)");
MODULE_DESCRIPTION("FBDev driver for Hercules Graphics Adaptor");
MODULE_LICENSE("GPL");
module_param(nologo, bool, 0);
MODULE_PARM_DESC(nologo, "Disables startup logo if != 0 (default=0)");
module_init(hgafb_init);
module_exit(hgafb_exit);
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