tridentfb.c

S3C44B0X下的LCD （framebuffer）驱动资料与相关代码

	if (p->vdispend & 0x200) tmp |= 0x40;
	if (p->vsyncstart & 0x200) tmp |= 0x80;

	write3X4(CRTOverflow, tmp);


	tmp = read3X4(CRTHiOrd) | 0x08;	//line compare bit 10

	if (p->vtotal & 0x400) tmp |= 0x80;
	if (p->vblankstart & 0x400) tmp |= 0x40;
	if (p->vsyncstart & 0x400) tmp |= 0x20;
	if (p->vdispend & 0x400) tmp |= 0x10;
	write3X4(CRTHiOrd, tmp);

	write3X4(HorizOverflow, 0);

	tmp = 0x40;
	if (p->vblankstart & 0x200) tmp |= 0x20;
	if (p->var.vmode & FB_VMODE_DOUBLE) tmp |= 0x80;  //double scan for 200 line modes
	write3X4(CRTMaxScanLine, tmp);
	write3X4(CRTLineCompare,0xFF);
	write3X4(CRTPRowScan,0);
	write3X4(CRTModeControl,0xC3);
	write3X4(LinearAddReg,0x20);	//enable linear addressing
	tmp = (p->var.vmode & FB_VMODE_INTERLACED) ? 0x84:0x80;
	write3X4(CRTCModuleTest,tmp);	//enable access extended memory
	write3X4(GraphEngReg, 0x80);	//enable GE for text acceleration

	if (p->var.accel_flags & FB_ACCELF_TEXT)
		acc->init_accel(p->hres,p->bpp);

	switch (p->bpp) {
		case 8:tmp=0;break;
		case 16:tmp=5;break;
		case 24:
			/* tmp=0x29;break; */
			/* seems like 24bpp is same as 32bpp when using vesafb */
		case 32:tmp=9;break;
	}
	write3X4(PixelBusReg, tmp);

	write3X4(InterfaceSel, 0x5B);	//32bit internal data path
	write3X4(DRAMControl, 0x30);	//both IO,linear enable
	write3X4(Performance, 0xBF);
	write3X4(PCIReg,0x07);		//MMIO & PCI read and write burst enable

	set_vclk(p->vclk);

	write3C4(0,3);
	write3C4(1,1);		//set char clock 8 dots wide
	write3C4(2,0x0F);	//enable 4 maps because needed in chain4 mode
	write3C4(3,0);
	write3C4(4,0x0E);	//memory mode enable bitmaps ??

	write3CE(MiscExtFunc,(p->bpp==32)?0x1A:0x12);	//divide clock by 2 if 32bpp
							//chain4 mode display and CPU path
	write3CE(0x5,0x40);	//no CGA compat,allow 256 col
	write3CE(0x6,0x05);	//graphics mode
	write3CE(0x7,0x0F);	//planes?

	writeAttr(0x10,0x41);	//graphics mode and support 256 color modes
	writeAttr(0x12,0x0F);	//planes
	writeAttr(0x13,0);	//horizontal pel panning

	//colors
	for(tmp = 0;tmp < 0x10;tmp++)
		writeAttr(tmp,tmp);
	readb(fb_info.io_virt + CRT + 0x0A);	//flip-flop to index
	t_outb(0x20, 0x3C0);			//enable attr

	switch (p->bpp) {
		case 8:	tmp = 0;break;		//256 colors
		case 15: tmp = 0x10;break;
		case 16: tmp = 0x30;break;	//hicolor
		case 24: 			//truecolor
		case 32: tmp = 0xD0;break;
	}

	t_inb(0x3C8);
	t_inb(0x3C6);
	t_inb(0x3C6);
	t_inb(0x3C6);
	t_inb(0x3C6);
	t_outb(tmp,0x3C6);
	t_inb(0x3C8);

	if (flatpanel)
		set_number_of_lines(p->vres);
	set_lwidth(p->hres*p->bpp/(4*16));

	trident_pan_display(&p->var,info);
	debug("exit\n");
}

/* Get value of one color register */
static int trident_getcolreg(unsigned regno, unsigned *red,
				 unsigned *green, unsigned *blue,
				 unsigned *transp, struct fb_info *info)
{
	struct tridentfb_info * i = (struct tridentfb_info *)info;
	int m = i->currentmode.bpp==8?256:16;

	debug("enter %d\n",regno);

	if (regno >= m)
		return 1;

	*red = palette[regno].red;
	*green = palette[regno].green;
	*blue = palette[regno].blue;
	*transp = palette[regno].transp;

	debug("exit\n");
	return 0;
}

/* Set one color register */
static int trident_setcolreg(unsigned regno, unsigned red, unsigned green,
				 unsigned blue, unsigned transp,
				 struct fb_info *info)
{
	struct tridentfb_info * i = (struct tridentfb_info *)info;
	int bpp = i->currentmode.bpp;
	int m = bpp==8?256:16;

	debug("enter %d\n",regno);

	if (regno >= m)
		return 1;

	palette[regno].red = red;
	palette[regno].green = green;
	palette[regno].blue = blue;
	palette[regno].transp = transp;

	if (bpp==8) {
		t_outb(0xFF,0x3C6);
		t_outb(regno,0x3C8);

		t_outb(red>>10,0x3C9);
		t_outb(green>>10,0x3C9);
		t_outb(blue>>10,0x3C9);

	} else
	if (bpp == 16) 			/* RGB 565 */
			((u16*)info->pseudo_palette)[regno] = (red & 0xF800) |
			((green & 0xFC00) >> 5) | ((blue & 0xF800) >> 11);
	else
	if (bpp == 32)		/* ARGB 8888 */
		((u32*)info->pseudo_palette)[regno] =
			((transp & 0xFF00) <<16) 	|
			((red & 0xFF00) << 8) 		|
			((green & 0xFF00))		|
			((blue & 0xFF00)>>8);

	debug("exit\n");
	return 0;
}

/* Try blanking the screen.For flat panels it does nothing */
static int trident_blank(int blank_mode, struct fb_info_gen *info)
{
	unsigned char PMCont,DPMSCont;

	debug("enter\n");
	if (flatpanel)
		return 0;
	t_outb(0x04,0x83C8); /* Read DPMS Control */
	PMCont = t_inb(0x83C6) & 0xFC;
	DPMSCont = read3CE(PowerStatus) & 0xFC;
	switch (blank_mode)
	{
	case VESA_NO_BLANKING:
		/* Screen: On, HSync: On, VSync: On */
		PMCont |= 0x03;
		DPMSCont |= 0x00;
		break;
	case VESA_HSYNC_SUSPEND:
		/* Screen: Off, HSync: Off, VSync: On */
		PMCont |= 0x02;
		DPMSCont |= 0x01;
		break;
	case VESA_VSYNC_SUSPEND:
		/* Screen: Off, HSync: On, VSync: Off */
		PMCont |= 0x02;
		DPMSCont |= 0x02;
		break;
	case VESA_POWERDOWN:
		/* Screen: Off, HSync: Off, VSync: Off */
		PMCont |= 0x00;
		DPMSCont |= 0x03;
		break;
    	}

	write3CE(PowerStatus,DPMSCont);
	t_outb(4,0x83C8);
	t_outb(PMCont,0x83C6);

	debug("exit\n");
	return 0;
}

/* Set display switch used by console */
static void trident_set_disp(const void *par, struct display *disp,
				 struct fb_info_gen *info)
{
	struct tridentfb_info * i = (struct tridentfb_info *)info;
	struct fb_info * ii = (struct fb_info *)info;
	struct tridentfb_par * p = (struct tridentfb_par *)par;
	int isaccel = p->var.accel_flags & FB_ACCELF_TEXT;

	disp->screen_base = (char *)i->fbmem_virt;
	debug("enter\n");
#ifdef FBCON_HAS_CFB8
	if (p->bpp == 8 ) {
		if (isaccel)
			disp->dispsw = &trident_8bpp;
		else
			disp->dispsw = &fbcon_cfb8;
	} else
#endif
#ifdef FBCON_HAS_CFB16
	if (p->bpp == 16) {
		if (isaccel)
			disp->dispsw = &trident_16bpp;
		else
			disp->dispsw = &fbcon_cfb16;
		disp->dispsw_data =ii->pseudo_palette;	/* console palette */
	} else
#endif
#ifdef FBCON_HAS_CFB32
	if (p->bpp == 32) {
		if (isaccel)
			disp->dispsw = &trident_32bpp;
		else
			disp->dispsw = &fbcon_cfb32;
		disp->dispsw_data =ii->pseudo_palette;	/* console palette */
	} else
#endif
	disp->dispsw = &fbcon_dummy;
	debug("exit\n");
}

static struct fbgen_hwswitch trident_hwswitch = {
	NULL, /* detect not needed */
	trident_encode_fix,
	trident_decode_var,
	trident_encode_var,
	trident_get_par,
	trident_set_par,
	trident_getcolreg,
	trident_setcolreg,
	trident_pan_display,
	trident_blank,
	trident_set_disp
};

static int trident_iosize;

static int __devinit trident_pci_probe(struct pci_dev * dev, const struct pci_device_id * id)
{
	int err;
	unsigned char revision;

	err = pci_enable_device(dev);
	if (err)
		return err;

	chip_id = id->device;

	/* If PCI id is 0x9660 then further detect chip type */
	
	if (chip_id == TGUI9660) {
		outb(RevisionID,0x3C4);
		revision = inb(0x3C5);	
	
		switch (revision) {
			case 0x22:
			case 0x23: chip_id = CYBER9397;break;
			case 0x2A: chip_id = CYBER9397DVD;break;
			case 0x30:
			case 0x33:
			case 0x34:
			case 0x35:
			case 0x38:
			case 0x3A:
			case 0xB3: chip_id = CYBER9385;break;
			case 0x40 ... 0x43: chip_id = CYBER9382;break;
			case 0x4A: chip_id = CYBER9388;break;
			default:break;	
		}
	}

	chip3D = is3Dchip(chip_id);

	if (is_xp(chip_id)) {
		acc = &accel_xp;
	} else 
	if (is_blade(chip_id)) {
		acc = &accel_blade;
	} else {
		acc = &accel_image;
	}

	/* acceleration is on by default for 3D chips */
	defaultaccel = chip3D && !noaccel;

	fb_info.io = pci_resource_start(dev,1);
	fb_info.fbmem = pci_resource_start(dev,0);

	trident_iosize = chip3D ? 0x20000:0x10000;

	if (!request_mem_region(fb_info.io, trident_iosize, "tridentfb")) {
		debug("request_region failed!\n");
		return -1;
	}

	fb_info.io_virt = (unsigned long)ioremap_nocache(fb_info.io, trident_iosize);

	if (!fb_info.io_virt) {
		release_region(fb_info.io, trident_iosize);
		debug("ioremap failed\n");
		return -1;
	}

	enable_mmio();

	fb_info.memsize = get_memsize();
	if (!request_mem_region(fb_info.fbmem, fb_info.memsize, "tridentfb")) {
		debug("request_mem_region failed!\n");
		return -1;
	}

	fb_info.fbmem_virt = (unsigned long)ioremap_nocache(fb_info.fbmem, fb_info.memsize);

	if (!fb_info.fbmem_virt) {
		release_mem_region(fb_info.fbmem, fb_info.memsize);
		debug("ioremap failed\n");
		return -1;
	}

	output("%s board found\n", dev->name);
	debug("Trident board found : mem = %X,io = %X, mem_v = %X, io_v = %X\n",
		fb_info.fbmem, fb_info.io, fb_info.fbmem_virt, fb_info.io_virt);

	fb_info.gen.parsize = sizeof (struct tridentfb_par);
	fb_info.gen.fbhw = &trident_hwswitch;

	strcpy(fb_info.gen.info.modename, tridentfb_name);
	displaytype = get_displaytype();

	if(flatpanel)
		fb_info.nativex = get_nativex();

	fb_info.gen.info.changevar = NULL;
	fb_info.gen.info.node = NODEV;
	fb_info.gen.info.fbops = &tridentfb_ops;
	fb_info.gen.info.disp = &disp;

	fb_info.gen.info.switch_con = &fbgen_switch;
	fb_info.gen.info.updatevar = &fbgen_update_var;
	fb_info.gen.info.blank = &fbgen_blank;

	fb_info.gen.info.flags = FBINFO_FLAG_DEFAULT;
	fb_info.gen.info.fontname[0] = '\0';
	fb_info.gen.info.pseudo_palette = pseudo_pal;

	/* This should give a reasonable default video mode */
	fb_find_mode(&default_var,&fb_info.gen.info,mode,NULL,0,NULL,bpp);

	if (defaultaccel && acc)
		default_var.accel_flags |= FB_ACCELF_TEXT;
	else
		default_var.accel_flags &= ~FB_ACCELF_TEXT;

	trident_decode_var(&default_var, &fb_info.currentmode, &fb_info.gen);
	fbgen_get_var(&disp.var, -1, &fb_info.gen.info);
	default_var.activate |= FB_ACTIVATE_NOW;
	fbgen_set_disp(-1, &fb_info.gen);

	if (register_framebuffer(&fb_info.gen.info) < 0) {
		printk("Could not register Trident framebuffer\n");
		return -EINVAL;
	}

	output("fb%d: %s frame buffer device %dx%d-%dbpp\n",
	   GET_FB_IDX(fb_info.gen.info.node), fb_info.gen.info.modename,default_var.xres,
	   default_var.yres,default_var.bits_per_pixel);
	return 0;
}

static void __devexit trident_pci_remove(struct pci_dev * dev)
{
	unregister_framebuffer(&fb_info.gen.info);
	iounmap((void *)fb_info.io_virt);
	iounmap((void *)fb_info.fbmem_virt);
	release_mem_region(fb_info.fbmem, fb_info.memsize);
	release_region(fb_info.io, trident_iosize);
}

/* List of boards that we are trying to support */
static struct pci_device_id trident_devices[] __devinitdata = {
	{PCI_VENDOR_ID_TRIDENT,	BLADE3D, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	CYBERBLADEi7, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	CYBERBLADEi7D, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	CYBERBLADEi1, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	CYBERBLADEi1D, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	CYBERBLADEAi1, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	CYBERBLADEAi1D, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	CYBERBLADEE4, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	TGUI9660, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	IMAGE975, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	IMAGE985, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	CYBER9320, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	CYBER9388, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	CYBER9520, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	CYBER9525DVD, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	CYBER9397, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	CYBER9397DVD, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	CYBERBLADEXPAi1, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	CYBERBLADEXPm8, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{PCI_VENDOR_ID_TRIDENT,	CYBERBLADEXPm16, PCI_ANY_ID,PCI_ANY_ID,0,0,0},
	{0,}
};	
	
MODULE_DEVICE_TABLE(pci,trident_devices); 

static struct pci_driver tridentfb_pci_driver = {
	name:"tridentfb",
	id_table:trident_devices,
	probe:trident_pci_probe,
	remove:__devexit_p(trident_pci_remove),
};

int __init tridentfb_init(void)
{
	output("Trident framebuffer %s initializing\n", VERSION);
	return pci_module_init(&tridentfb_pci_driver);
}

void __exit tridentfb_exit(void)
{
	pci_unregister_driver(&tridentfb_pci_driver);
}


/*
 * Parse user specified options (`video=trident:')
 * example:
 * 	video=trident:800x600,bpp=16,noaccel
 */
int tridentfb_setup(char *options)
{
	char * opt;
	if (!options || !*options)
		return 0;
	while((opt = strsep(&options,",")) != NULL ) {
		if (!*opt) continue;
		if (!strncmp(opt,"noaccel",7))
			noaccel = 1;
		else if (!strncmp(opt,"fp",2))
			displaytype = DISPLAY_FP;
		else if (!strncmp(opt,"crt",3))
			displaytype = DISPLAY_CRT;
		else if (!strncmp(opt,"bpp=",4))
			bpp = simple_strtoul(opt+4,NULL,0);
		else if (!strncmp(opt,"center",6))
			center = 1;
		else if (!strncmp(opt,"stretch",7))
			stretch = 1;
		else if (!strncmp(opt,"memsize=",8))
			memsize = simple_strtoul(opt+8,NULL,0);
		else if (!strncmp(opt,"memdiff=",8))
			memdiff = simple_strtoul(opt+8,NULL,0);
		else if (!strncmp(opt,"nativex=",8))
			nativex = simple_strtoul(opt+8,NULL,0);
		else
			mode = opt;
	}
	return 0;
}

static struct fb_ops tridentfb_ops = {
	fb_get_fix:fbgen_get_fix,
	fb_get_var:fbgen_get_var,
	fb_set_var:fbgen_set_var,
	fb_get_cmap:fbgen_get_cmap,
	fb_set_cmap:fbgen_set_cmap,
	fb_pan_display:fbgen_pan_display,
};

#ifdef MODULE
module_init(tridentfb_init);
#endif
module_exit(tridentfb_exit);

MODULE_AUTHOR("Jani Monoses <[e-mail]>");
MODULE_DESCRIPTION("Framebuffer driver for Trident cards");
MODULE_LICENSE("GPL");