stifb.c

Linux环境下视频显示卡设备的驱动程序源代码

		struct fb_var_screeninfo *var = &fb->info.var;
		if (regno < 16)
			((u32 *)fb->info.pseudo_palette)[regno] =
				regno << var->red.offset |
				regno << var->green.offset |
				regno << var->blue.offset;
	}

	WRITE_IMAGE_COLOR(fb, regno, color);

	if (fb->id == S9000_ID_HCRX) {
		NgleLutBltCtl lutBltCtl;

		lutBltCtl = setHyperLutBltCtl(fb,
				0,	/* Offset w/i LUT */
				256);	/* Load entire LUT */
		NGLE_BINC_SET_SRCADDR(fb,
				NGLE_LONG_FB_ADDRESS(0, 0x100, 0)); 
				/* 0x100 is same as used in WRITE_IMAGE_COLOR() */
		START_COLORMAPLOAD(fb, lutBltCtl.all);
		SETUP_FB(fb);
	} else {
		/* cleanup colormap hardware */
		FINISH_IMAGE_COLORMAP_ACCESS(fb);
	}

	DEBUG_ON();

	return 0;
}

static int
stifb_blank(int blank_mode, struct fb_info *info)
{
	struct stifb_info *fb = (struct stifb_info *) info;
	int enable = (blank_mode == 0) ? ENABLE : DISABLE;

	switch (fb->id) {
	case S9000_ID_A1439A:
		CRX24_ENABLE_DISABLE_DISPLAY(fb, enable);
		break;
	case CRT_ID_VISUALIZE_EG:
	case S9000_ID_ARTIST:
		ARTIST_ENABLE_DISABLE_DISPLAY(fb, enable);
		break;
	case S9000_ID_HCRX:
		HYPER_ENABLE_DISABLE_DISPLAY(fb, enable);
		break;
	case S9000_ID_A1659A:	/* fall through */
	case S9000_ID_TIMBER:
	case CRX24_OVERLAY_PLANES:
	default:
		ENABLE_DISABLE_DISPLAY(fb, enable);
		break;
	}
	
	SETUP_FB(fb);
	return 0;
}

static void __init
stifb_init_display(struct stifb_info *fb)
{
	int id = fb->id;

	SETUP_FB(fb);

	/* HCRX specific initialization */
	SETUP_HCRX(fb);
	
	/*
	if (id == S9000_ID_HCRX)
		hyperInitSprite(fb);
	else
		ngleInitSprite(fb);
	*/
	
	/* Initialize the image planes. */ 
        switch (id) {
	 case S9000_ID_HCRX:
	    hyperResetPlanes(fb, ENABLE);
	    break;
	 case S9000_ID_A1439A:
	    rattlerSetupPlanes(fb);
	    break;
	 case S9000_ID_A1659A:
	 case S9000_ID_ARTIST:
	 case CRT_ID_VISUALIZE_EG:
	    elkSetupPlanes(fb);
	    break;
	}

	/* Clear attribute planes on non HCRX devices. */
        switch (id) {
	 case S9000_ID_A1659A:
	 case S9000_ID_A1439A:
	    if (fb->info.var.bits_per_pixel == 32)
		ngleSetupAttrPlanes(fb, BUFF1_CMAP3);
	    else {
		ngleSetupAttrPlanes(fb, BUFF1_CMAP0);
	    }
	    if (id == S9000_ID_A1439A)
		ngleClearOverlayPlanes(fb, 0xff, 0);
	    break;
	 case S9000_ID_ARTIST:
	 case CRT_ID_VISUALIZE_EG:
	    if (fb->info.var.bits_per_pixel == 32)
		ngleSetupAttrPlanes(fb, BUFF1_CMAP3);
	    else {
		ngleSetupAttrPlanes(fb, ARTIST_CMAP0);
	    }
	    break;
	}
	stifb_blank(0, (struct fb_info *)fb);	/* 0=enable screen */

	SETUP_FB(fb);
}

/* ------------ Interfaces to hardware functions ------------ */

static struct fb_ops stifb_ops = {
	.owner		= THIS_MODULE,
	.fb_setcolreg	= stifb_setcolreg,
	.fb_blank	= stifb_blank,
	.fb_fillrect	= cfb_fillrect,
	.fb_copyarea	= cfb_copyarea,
	.fb_imageblit	= cfb_imageblit,
};


/*
 *  Initialization
 */

static int __init stifb_init_fb(struct sti_struct *sti, int bpp_pref)
{
	struct fb_fix_screeninfo *fix;
	struct fb_var_screeninfo *var;
	struct stifb_info *fb;
	struct fb_info *info;
	unsigned long sti_rom_address;
	char *dev_name;
	int bpp, xres, yres;

	fb = kzalloc(sizeof(*fb), GFP_ATOMIC);
	if (!fb) {
		printk(KERN_ERR "stifb: Could not allocate stifb structure\n");
		return -ENODEV;
	}
	
	info = &fb->info;

	/* set struct to a known state */
	fix = &info->fix;
	var = &info->var;

	fb->sti = sti;
	/* store upper 32bits of the graphics id */
	fb->id = fb->sti->graphics_id[0];

	/* only supported cards are allowed */
	switch (fb->id) {
	case CRT_ID_VISUALIZE_EG:
		/* Visualize cards can run either in "double buffer" or
 		  "standard" mode. Depending on the mode, the card reports
		  a different device name, e.g. "INTERNAL_EG_DX1024" in double
		  buffer mode and "INTERNAL_EG_X1024" in standard mode.
		  Since this driver only supports standard mode, we check
		  if the device name contains the string "DX" and tell the
		  user how to reconfigure the card. */
		if (strstr(sti->outptr.dev_name, "DX")) {
		   printk(KERN_WARNING "WARNING: stifb framebuffer driver does not "
			"support '%s' in double-buffer mode.\n"
			KERN_WARNING "WARNING: Please disable the double-buffer mode "
			"in IPL menu (the PARISC-BIOS).\n",
			sti->outptr.dev_name);
		   goto out_err0;
		}
		/* fall though */
	case S9000_ID_ARTIST:
	case S9000_ID_HCRX:
	case S9000_ID_TIMBER:
	case S9000_ID_A1659A:
	case S9000_ID_A1439A:
		break;
	default:
		printk(KERN_WARNING "stifb: '%s' (id: 0x%08x) not supported.\n",
			sti->outptr.dev_name, fb->id);
		goto out_err0;
	}
	
	/* default to 8 bpp on most graphic chips */
	bpp = 8;
	xres = sti_onscreen_x(fb->sti);
	yres = sti_onscreen_y(fb->sti);

	ngleGetDeviceRomData(fb);

	/* get (virtual) io region base addr */
	fix->mmio_start = REGION_BASE(fb,2);
	fix->mmio_len   = 0x400000;

       	/* Reject any device not in the NGLE family */
	switch (fb->id) {
	case S9000_ID_A1659A:	/* CRX/A1659A */
		break;
	case S9000_ID_ELM:	/* GRX, grayscale but else same as A1659A */
		var->grayscale = 1;
		fb->id = S9000_ID_A1659A;
		break;
	case S9000_ID_TIMBER:	/* HP9000/710 Any (may be a grayscale device) */
		dev_name = fb->sti->outptr.dev_name;
		if (strstr(dev_name, "GRAYSCALE") || 
		    strstr(dev_name, "Grayscale") ||
		    strstr(dev_name, "grayscale"))
			var->grayscale = 1;
		break;
	case S9000_ID_TOMCAT:	/* Dual CRX, behaves else like a CRX */
		/* FIXME: TomCat supports two heads:
		 * fb.iobase = REGION_BASE(fb_info,3);
		 * fb.screen_base = ioremap_nocache(REGION_BASE(fb_info,2),xxx);
		 * for now we only support the left one ! */
		xres = fb->ngle_rom.x_size_visible;
		yres = fb->ngle_rom.y_size_visible;
		fb->id = S9000_ID_A1659A;
		break;
	case S9000_ID_A1439A:	/* CRX24/A1439A */
		bpp = 32;
		break;
	case S9000_ID_HCRX:	/* Hyperdrive/HCRX */
		memset(&fb->ngle_rom, 0, sizeof(fb->ngle_rom));
		if ((fb->sti->regions_phys[0] & 0xfc000000) ==
		    (fb->sti->regions_phys[2] & 0xfc000000))
			sti_rom_address = F_EXTEND(fb->sti->regions_phys[0]);
		else
			sti_rom_address = F_EXTEND(fb->sti->regions_phys[1]);

		fb->deviceSpecificConfig = gsc_readl(sti_rom_address);
		if (IS_24_DEVICE(fb)) {
			if (bpp_pref == 8 || bpp_pref == 32)
				bpp = bpp_pref;
			else
				bpp = 32;
		} else
			bpp = 8;
		READ_WORD(fb, REG_15);
		SETUP_HW(fb);
		break;
	case CRT_ID_VISUALIZE_EG:
	case S9000_ID_ARTIST:	/* Artist */
		break;
	default: 
#ifdef FALLBACK_TO_1BPP
	       	printk(KERN_WARNING 
			"stifb: Unsupported graphics card (id=0x%08x) "
				"- now trying 1bpp mode instead\n",
			fb->id);
		bpp = 1;	/* default to 1 bpp */
		break;
#else
	       	printk(KERN_WARNING 
			"stifb: Unsupported graphics card (id=0x%08x) "
				"- skipping.\n",
			fb->id);
		goto out_err0;
#endif
	}


	/* get framebuffer physical and virtual base addr & len (64bit ready) */
	fix->smem_start = F_EXTEND(fb->sti->regions_phys[1]);
	fix->smem_len = fb->sti->regions[1].region_desc.length * 4096;

	fix->line_length = (fb->sti->glob_cfg->total_x * bpp) / 8;
	if (!fix->line_length)
		fix->line_length = 2048; /* default */
	
	/* limit fbsize to max visible screen size */
	if (fix->smem_len > yres*fix->line_length)
		fix->smem_len = yres*fix->line_length;
	
	fix->accel = FB_ACCEL_NONE;

	switch (bpp) {
	    case 1:
		fix->type = FB_TYPE_PLANES;	/* well, sort of */
		fix->visual = FB_VISUAL_MONO10;
		var->red.length = var->green.length = var->blue.length = 1;
		break;
	    case 8:
		fix->type = FB_TYPE_PACKED_PIXELS;
		fix->visual = FB_VISUAL_PSEUDOCOLOR;
		var->red.length = var->green.length = var->blue.length = 8;
		break;
	    case 32:
		fix->type = FB_TYPE_PACKED_PIXELS;
		fix->visual = FB_VISUAL_DIRECTCOLOR;
		var->red.length = var->green.length = var->blue.length = var->transp.length = 8;
		var->blue.offset = 0;
		var->green.offset = 8;
		var->red.offset = 16;
		var->transp.offset = 24;
		break;
	    default:
		break;
	}
	
	var->xres = var->xres_virtual = xres;
	var->yres = var->yres_virtual = yres;
	var->bits_per_pixel = bpp;

	strcpy(fix->id, "stifb");
	info->fbops = &stifb_ops;
	info->screen_base = ioremap_nocache(REGION_BASE(fb,1), fix->smem_len);
	info->screen_size = fix->smem_len;
	info->flags = FBINFO_DEFAULT;
	info->pseudo_palette = &fb->pseudo_palette;

	/* This has to been done !!! */
	fb_alloc_cmap(&info->cmap, NR_PALETTE, 0);
	stifb_init_display(fb);

	if (!request_mem_region(fix->smem_start, fix->smem_len, "stifb fb")) {
		printk(KERN_ERR "stifb: cannot reserve fb region 0x%04lx-0x%04lx\n",
				fix->smem_start, fix->smem_start+fix->smem_len);
		goto out_err1;
	}
		
	if (!request_mem_region(fix->mmio_start, fix->mmio_len, "stifb mmio")) {
		printk(KERN_ERR "stifb: cannot reserve sti mmio region 0x%04lx-0x%04lx\n",
				fix->mmio_start, fix->mmio_start+fix->mmio_len);
		goto out_err2;
	}

	if (register_framebuffer(&fb->info) < 0)
		goto out_err3;

	sti->info = info; /* save for unregister_framebuffer() */

	printk(KERN_INFO 
	    "fb%d: %s %dx%d-%d frame buffer device, %s, id: %04x, mmio: 0x%04lx\n",
		fb->info.node, 
		fix->id,
		var->xres, 
		var->yres,
		var->bits_per_pixel,
		sti->outptr.dev_name,
		fb->id, 
		fix->mmio_start);

	return 0;


out_err3:
	release_mem_region(fix->mmio_start, fix->mmio_len);
out_err2:
	release_mem_region(fix->smem_start, fix->smem_len);
out_err1:
	iounmap(info->screen_base);
	fb_dealloc_cmap(&info->cmap);
out_err0:
	kfree(fb);
	return -ENXIO;
}

static int stifb_disabled __initdata;

int __init
stifb_setup(char *options);

static int __init stifb_init(void)
{
	struct sti_struct *sti;
	struct sti_struct *def_sti;
	int i;
	
#ifndef MODULE
	char *option = NULL;

	if (fb_get_options("stifb", &option))
		return -ENODEV;
	stifb_setup(option);
#endif
	if (stifb_disabled) {
		printk(KERN_INFO "stifb: disabled by \"stifb=off\" kernel parameter\n");
		return -ENXIO;
	}
	
	def_sti = sti_get_rom(0);
	if (def_sti) {
		for (i = 1; i <= MAX_STI_ROMS; i++) {
			sti = sti_get_rom(i);
			if (!sti)
				break;
			if (sti == def_sti) {
				stifb_init_fb(sti, stifb_bpp_pref[i - 1]);
				break;
			}
		}
	}

	for (i = 1; i <= MAX_STI_ROMS; i++) {
		sti = sti_get_rom(i);
		if (!sti)
			break;
		if (sti == def_sti)
			continue;
		stifb_init_fb(sti, stifb_bpp_pref[i - 1]);
	}
	return 0;
}

/*
 *  Cleanup
 */

static void __exit
stifb_cleanup(void)
{
	struct sti_struct *sti;
	int i;
	
	for (i = 1; i <= MAX_STI_ROMS; i++) {
		sti = sti_get_rom(i);
		if (!sti)
			break;
		if (sti->info) {
			struct fb_info *info = sti->info;
			unregister_framebuffer(sti->info);
			release_mem_region(info->fix.mmio_start, info->fix.mmio_len);
		        release_mem_region(info->fix.smem_start, info->fix.smem_len);
				if (info->screen_base)
					iounmap(info->screen_base);
		        fb_dealloc_cmap(&info->cmap);
		        kfree(info); 
		}
		sti->info = NULL;
	}
}

int __init
stifb_setup(char *options)
{
	int i;
	
	if (!options || !*options)
		return 1;
	
	if (strncmp(options, "off", 3) == 0) {
		stifb_disabled = 1;
		options += 3;
	}

	if (strncmp(options, "bpp", 3) == 0) {
		options += 3;
		for (i = 0; i < MAX_STI_ROMS; i++) {
			if (*options++ != ':')
				break;
			stifb_bpp_pref[i] = simple_strtoul(options, &options, 10);
		}
	}
	return 1;
}

__setup("stifb=", stifb_setup);

module_init(stifb_init);
module_exit(stifb_cleanup);

MODULE_AUTHOR("Helge Deller <[e-mail]>, Thomas Bogendoerfer <[e-mail]>");
MODULE_DESCRIPTION("Framebuffer driver for HP's NGLE series graphics cards in HP PARISC machines");
MODULE_LICENSE("GPL v2");