[linux.git] / drivers / video / hgafb.c

/*
 * linux/drivers/video/hgafb.c -- Hercules graphics adaptor frame buffer device
 * 
 *      Created 25 Nov 1999 by Ferenc Bakonyi ([email protected])
 *      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 = {
	.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 = {
	.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 bool 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 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 + info->var.xres > info->var.xres_virtual
		 || var->yoffset + info->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 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 ([email protected])");
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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/drivers/video/hgafb.c -- Hercules graphics adaptor frame buffer device
	3	*
	4	* Created 25 Nov 1999 by Ferenc Bakonyi ([email protected])
	5	* Based on skeletonfb.c by Geert Uytterhoeven and
	6	* mdacon.c by Andrew Apted
	7	*
	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 cards
	13	* being detected as Hercules. (Paul G.)
	14	* - Revision 0.1.6 (17 Aug 2000): new style structs
	15	* documentation
	16	* - Revision 0.1.5 (13 Mar 2000): spinlocks instead of saveflags();cli();etc
	17	* minor fixes
	18	* - Revision 0.1.4 (24 Jan 2000): fixed a bug in hga_card_detect() for
	19	* HGA-only systems
	20	* - Revision 0.1.3 (22 Jan 2000): modified for the new fb_info structure
	21	* screen is cleared after rmmod
	22	* virtual resolutions
	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)
	27	*
	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
	30	* 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>
1da177e4 LT	39	#include <linux/delay.h>
	40	#include <linux/fb.h>
	41	#include <linux/init.h>
	42	#include <linux/ioport.h>
1d204ef3	43	#include <linux/platform_device.h>
1da177e4 LT	44	#include <asm/io.h>
	45	#include <asm/vga.h>
	46
	47	#if 0
	48	#define DPRINTK(args...) printk(KERN_DEBUG __FILE__": " ##args)
	49	#else
	50	#define DPRINTK(args...)
	51	#endif
	52
	53	#if 0
	54	#define CHKINFO(ret) if (info != &fb_info) { printk(KERN_DEBUG __FILE__": This should never happen, line:%d \n", __LINE__); return ret; }
	55	#else
	56	#define CHKINFO(ret)
	57	#endif
	58
	59	/* Description of the hardware layout */
	60
	61	static void __iomem hga_vram; / Base of video memory */
	62	static 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 0
	66	#define HGA_GFX 1
	67
	68	static inline u8 __iomem * rowaddr(struct fb_info *info, u_int row)
	69	{
	70	return info->screen_base + HGA_ROWADDR(row);
	71	}
	72
	73	static int hga_mode = -1; /* 0 = txt, 1 = gfx mode */
	74
	75	static enum { TYPE_HERC, TYPE_HERCPLUS, TYPE_HERCCOLOR } hga_type;
	76	static 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 0x00
	87	#define HGA_CURSOR_OFF 0x20
	88	#define HGA_CURSOR_SLOWBLINK 0x60
	89
	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
	94
	95	#define HGA_STATUS_HSYNC 0x01
	96	#define HGA_STATUS_VSYNC 0x80
	97	#define HGA_STATUS_VIDEO 0x08
	98
	99	#define HGA_CONFIG_COL132 0x08
	100	#define HGA_GFX_MODE_EN 0x01
	101	#define HGA_GFX_PAGE_EN 0x02
	102
	103	/* Global locks */
	104
	105	static DEFINE_SPINLOCK(hga_reg_lock);
	106
	107	/* Framebuffer driver structures */
108
48c68c4f	109	static struct fb_var_screeninfo hga_default_var = {
1da177e4 LT	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
48c68c4f	123	static struct fb_fix_screeninfo hga_fix = {
1da177e4 LT	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_NONE
	131	};
	132
1da177e4 LT	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;
90ab5ee9	136	static bool nologo = 0;
1da177e4 LT	137
	138	/* -------------------------------------------------------------------------
	139	*
	140	* Low level hardware functions
	141	*
	142	* ------------------------------------------------------------------------- */
	143
	144	static 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
	150	static 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
	156	static 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
	164	static 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
	179	static 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
210	static 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
241	static 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
254	static 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
266	static 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
48c68c4f	279	static int hga_card_detect(void)
1da177e4	280	{
630c2701	281	int count = 0;
1da177e4 LT	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
	289	if (request_region(0x3b0, 12, "hgafb"))
	290	release_io_ports = 1;
	291	if (request_region(0x3bf, 1, "hgafb"))
	292	release_io_port = 1;
	293
	294	/* do a memory check */
	295
	296	p = hga_vram;
	297	q = hga_vram + 0x01000;
	298
	299	p_save = readw(p); q_save = readw(q);
	300
	301	writew(0xaa55, p); if (readw(p) == 0xaa55) count++;
	302	writew(0x55aa, p); if (readw(p) == 0x55aa) count++;
	303	writew(p_save, p);
	304
630c2701 KH	305	if (count != 2)
630c2701 KH	306	goto error;
1da177e4 LT	307
	308	/* Ok, there is definitely a card registering at the correct
	309	* memory location, so now we do an I/O port test.
	310	*/
	311
630c2701 KH	312	if (!test_hga_b(0x66, 0x0f)) /* cursor low register */
	313	goto error;
	314
	315	if (!test_hga_b(0x99, 0x0f)) /* cursor low register */
	316	goto error;
1da177e4 LT	317
	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.
	321	*/
	322
	323	p_save = q_save = inb_p(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;
	324
	325	for (count=0; count < 50000 && p_save == q_save; count++) {
	326	q_save = inb(HGA_STATUS_PORT) & HGA_STATUS_VSYNC;
	327	udelay(2);
	328	}
	329
	330	if (p_save == q_save)
630c2701	331	goto error;
1da177e4 LT	332
	333	switch (inb_p(HGA_STATUS_PORT) & 0x70) {
	334	case 0x10:
	335	hga_type = TYPE_HERCPLUS;
	336	hga_type_name = "HerculesPlus";
	337	break;
	338	case 0x50:
	339	hga_type = TYPE_HERCCOLOR;
	340	hga_type_name = "HerculesColor";
	341	break;
	342	default:
	343	hga_type = TYPE_HERC;
	344	hga_type_name = "Hercules";
	345	break;
	346	}
	347	return 1;
630c2701 KH	348	error:
	349	if (release_io_ports)
	350	release_region(0x3b0, 12);
	351	if (release_io_port)
	352	release_region(0x3bf, 1);
	353	return 0;
1da177e4 LT	354	}
	355
	356	/**
	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.
	360	*/
	361
	362	static int hgafb_open(struct fb_info *info, int init)
	363	{
	364	hga_gfx_mode();
	365	hga_clear_screen();
	366	if (!nologo) hga_show_logo(info);
	367	return 0;
	368	}
	369
	370	/**
	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.
	374	*/
	375
	376	static int hgafb_release(struct fb_info *info, int init)
	377	{
	378	hga_txt_mode();
	379	hga_clear_screen();
	380	return 0;
	381	}
	382
	383	/**
	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
	390	* @info:unused
	391	*
	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.
	395	*/
	396
	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)
	399	{
	400	if (regno > 1)
	401	return 1;
	402	return 0;
	403	}
	404
	405	/**
	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
	409	*
	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.
	414	*/
	415
	416	static int hgafb_pan_display(struct fb_var_screeninfo *var,
	417	struct fb_info *info)
418	{
419	if (var->vmode & FB_VMODE_YWRAP) {
420	if (var->yoffset < 0 \|\|
421	var->yoffset >= info->var.yres_virtual \|\|
422	var->xoffset)
423	return -EINVAL;
424	} else {
7b116e54 LP	425	if (var->xoffset + info->var.xres > info->var.xres_virtual
7b116e54 LP	426	\|\| var->yoffset + info->var.yres > info->var.yres_virtual
1da177e4 LT	427	\|\| var->yoffset % 8)
	428	return -EINVAL;
	429	}
	430
	431	hga_pan(var->xoffset, var->yoffset);
	432	return 0;
	433	}
	434
	435	/**
	436	* hgafb_blank - (un)blank the screen
	437	* @blank_mode:blanking method to use
	438	* @info:unused
	439	*
	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.
	446	*/
	447
	448	static int hgafb_blank(int blank_mode, struct fb_info *info)
	449	{
	450	hga_blank(blank_mode);
	451	return 0;
	452	}
	453
	454	/*
	455	* Accel functions
	456	*/
1da177e4 LT	457	static void hgafb_fillrect(struct fb_info info, const struct fb_fillrect rect)
	458	{
	459	u_int rows, y;
	460	u8 __iomem *dest;
	461
	462	y = rect->dy;
	463
	464	for (rows = rect->height; rows--; y++) {
	465	dest = rowaddr(info, y) + (rect->dx >> 3);
	466	switch (rect->rop) {
	467	case ROP_COPY:
529ed806	468	memset_io(dest, rect->color, (rect->width >> 3));
1da177e4 LT	469	break;
	470	case ROP_XOR:
	471	fb_writeb(~(fb_readb(dest)), dest);
	472	break;
	473	}
	474	}
	475	}
	476
	477	static void hgafb_copyarea(struct fb_info info, const struct fb_copyarea area)
	478	{
	479	u_int rows, y1, y2;
	480	u8 __iomem *src;
	481	u8 __iomem *dest;
	482
	483	if (area->dy <= area->sy) {
	484	y1 = area->sy;
	485	y2 = area->dy;
	486
	487	for (rows = area->height; rows--; ) {
	488	src = rowaddr(info, y1) + (area->sx >> 3);
	489	dest = rowaddr(info, y2) + (area->dx >> 3);
529ed806	490	memmove(dest, src, (area->width >> 3));
1da177e4 LT	491	y1++;
	492	y2++;
	493	}
	494	} else {
	495	y1 = area->sy + area->height - 1;
	496	y2 = area->dy + area->height - 1;
	497
	498	for (rows = area->height; rows--;) {
	499	src = rowaddr(info, y1) + (area->sx >> 3);
	500	dest = rowaddr(info, y2) + (area->dx >> 3);
529ed806	501	memmove(dest, src, (area->width >> 3));
1da177e4 LT	502	y1--;
	503	y2--;
	504	}
	505	}
	506	}
	507
	508	static void hgafb_imageblit(struct fb_info info, const struct fb_image image)
	509	{
	510	u8 __iomem *dest;
	511	u8 cdat = (u8 ) image->data;
	512	u_int rows, y = image->dy;
529ed806	513	u_int x;
1da177e4 LT	514	u8 d;
	515
	516	for (rows = image->height; rows--; y++) {
529ed806 BC	517	for (x = 0; x < image->width; x+= 8) {
	518	d = *cdat++;
	519	dest = rowaddr(info, y) + ((image->dx + x)>> 3);
	520	fb_writeb(d, dest);
	521	}
1da177e4 LT	522	}
1da177e4 LT	523	}
1da177e4 LT	524
	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,
	535	};
	536
	537	/* ------------------------------------------------------------------------- *
	538	*
	539	* Functions in fb_info
	540	*
	541	* ------------------------------------------------------------------------- */
	542
	543	/* ------------------------------------------------------------------------- */
	544
	545	/*
	546	* Initialization
	547	*/
	548
48c68c4f	549	static int hgafb_probe(struct platform_device *pdev)
1da177e4	550	{
1d204ef3	551	struct fb_info *info;
1da177e4 LT	552
	553	if (! hga_card_detect()) {
	554	printk(KERN_INFO "hgafb: HGA card not detected.\n");
	555	if (hga_vram)
	556	iounmap(hga_vram);
	557	return -EINVAL;
	558	}
	559
	560	printk(KERN_INFO "hgafb: %s with %ldK of memory detected.\n",
	561	hga_type_name, hga_vram_len/1024);
	562
2870086e	563	info = framebuffer_alloc(0, &pdev->dev);
1d204ef3 AD	564	if (!info) {
	565	iounmap(hga_vram);
	566	return -ENOMEM;
	567	}
	568
1da177e4 LT	569	hga_fix.smem_start = (unsigned long)hga_vram;
	570	hga_fix.smem_len = hga_vram_len;
	571
1d204ef3 AD	572	info->flags = FBINFO_DEFAULT \| FBINFO_HWACCEL_YPAN;
	573	info->var = hga_default_var;
	574	info->fix = hga_fix;
	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;
	582
	583	if (register_framebuffer(info) < 0) {
	584	framebuffer_release(info);
1da177e4 LT	585	iounmap(hga_vram);
	586	return -EINVAL;
	587	}
	588
	589	printk(KERN_INFO "fb%d: %s frame buffer device\n",
1d204ef3	590	info->node, info->fix.id);
2870086e	591	platform_set_drvdata(pdev, info);
1da177e4 LT	592	return 0;
	593	}
	594
48c68c4f	595	static int hgafb_remove(struct platform_device *pdev)
1da177e4	596	{
2870086e	597	struct fb_info *info = platform_get_drvdata(pdev);
1d204ef3	598
1da177e4 LT	599	hga_txt_mode();
1da177e4 LT	600	hga_clear_screen();
1d204ef3 AD	601
	602	if (info) {
	603	unregister_framebuffer(info);
	604	framebuffer_release(info);
	605	}
	606
1da177e4	607	iounmap(hga_vram);
1d204ef3 AD	608
	609	if (release_io_ports)
	610	release_region(0x3b0, 12);
	611
	612	if (release_io_port)
	613	release_region(0x3bf, 1);
	614
	615	return 0;
	616	}
	617
2870086e	618	static struct platform_driver hgafb_driver = {
1d204ef3	619	.probe = hgafb_probe,
48c68c4f	620	.remove = hgafb_remove,
2870086e KH	621	.driver = {
	622	.name = "hgafb",
	623	},
1d204ef3 AD	624	};
1d204ef3 AD	625
2870086e	626	static struct platform_device *hgafb_device;
1d204ef3 AD	627
	628	static int __init hgafb_init(void)
	629	{
	630	int ret;
	631
	632	if (fb_get_options("hgafb", NULL))
	633	return -ENODEV;
	634
2870086e	635	ret = platform_driver_register(&hgafb_driver);
1d204ef3 AD	636
1d204ef3 AD	637	if (!ret) {
2870086e KH	638	hgafb_device = platform_device_register_simple("hgafb", 0, NULL, 0);
	639
	640	if (IS_ERR(hgafb_device)) {
	641	platform_driver_unregister(&hgafb_driver);
	642	ret = PTR_ERR(hgafb_device);
	643	}
1d204ef3 AD	644	}
	645
	646	return ret;
	647	}
	648
	649	static void __exit hgafb_exit(void)
	650	{
2870086e KH	651	platform_device_unregister(hgafb_device);
2870086e KH	652	platform_driver_unregister(&hgafb_driver);
1da177e4	653	}
1da177e4 LT	654
	655	/* -------------------------------------------------------------------------
	656	*
	657	* Modularization
	658	*
	659	* ------------------------------------------------------------------------- */
	660
	661	MODULE_AUTHOR("Ferenc Bakonyi ([email protected])");
	662	MODULE_DESCRIPTION("FBDev driver for Hercules Graphics Adaptor");
	663	MODULE_LICENSE("GPL");
	664
	665	module_param(nologo, bool, 0);
	666	MODULE_PARM_DESC(nologo, "Disables startup logo if != 0 (default=0)");
	667	module_init(hgafb_init);
1da177e4	668	module_exit(hgafb_exit);