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alistair23-linux/drivers/video/hgafb.c
Brent Cook 529ed806d4 video: Fix the HGA framebuffer driver 
Resurrected some old hardware and fixed up the hgafb driver to work
again. Only tested with fbcon, since most fbdev-based software appears
to only support 12bpp and up. It does not appear that this driver has
worked for at least the entire 2.6.x series, perhaps since 2002.

Hercules graphics hardware uses packed pixels horizontally, but rows are
not linear. In other words, the pixels are not packed vertically. This
means that custom imageblit, fillrect and copyarea need to be written
specific to the hardware.

 * Removed the experimental acceleration option, since it is required
   for the hardware to work.
 * Fixed imageblit to work with fb_image's wider than 8 pixels.
 * Updated configuration text (HGA hardware is from 1984)

Signed-off-by: Brent Cook <busterb@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2011-01-06 15:48:13 +09:00

669 lines
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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/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 hga_default_var __devinitdata = {
.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 hga_fix __devinitdata = {
.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 __devinit 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
*/
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:
memset_io(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);
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);
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;
u_int x;
u8 d;
for (rows = image->height; rows--; y++) {
for (x = 0; x < image->width; x+= 8) {
d = *cdat++;
dest = rowaddr(info, y) + ((image->dx + x)>> 3);
fb_writeb(d, dest);
}
}
}
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 __devinit 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 __devexit 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 = __devexit_p(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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