savagefb_driver.c

Linux环境下视频显示卡设备的驱动程序源代码

		else if ((var->bits_per_pixel > 8) && (var->bits_per_pixel < 24))
			par->dacSpeedBpp = par->clock[1];
		else if (var->bits_per_pixel <= 8)
			par->dacSpeedBpp = par->clock[0];
	}

	/* Set ramdac limits */
	par->maxClock = par->dacSpeedBpp;
	par->minClock = 10000;

	savagefb_set_par_int(par, &par->state);
	fb_set_cmap(&info->cmap, info);
	savagefb_set_fix(info);
	savagefb_set_clip(info);

	SavagePrintRegs(par);
	return 0;
}

/*
 *    Pan or Wrap the Display
 */
static int savagefb_pan_display(struct fb_var_screeninfo *var,
				struct fb_info           *info)
{
	struct savagefb_par *par = info->par;

	savagefb_update_start(par, var);
	return 0;
}

static int savagefb_blank(int blank, struct fb_info *info)
{
	struct savagefb_par *par = info->par;
	u8 sr8 = 0, srd = 0;

	if (par->display_type == DISP_CRT) {
		vga_out8(0x3c4, 0x08, par);
		sr8 = vga_in8(0x3c5, par);
		sr8 |= 0x06;
		vga_out8(0x3c5, sr8, par);
		vga_out8(0x3c4, 0x0d, par);
		srd = vga_in8(0x3c5, par);
		srd &= 0x03;

		switch (blank) {
		case FB_BLANK_UNBLANK:
		case FB_BLANK_NORMAL:
			break;
		case FB_BLANK_VSYNC_SUSPEND:
			srd |= 0x10;
			break;
		case FB_BLANK_HSYNC_SUSPEND:
			srd |= 0x40;
			break;
		case FB_BLANK_POWERDOWN:
			srd |= 0x50;
			break;
		}

		vga_out8(0x3c4, 0x0d, par);
		vga_out8(0x3c5, srd, par);
	}

	if (par->display_type == DISP_LCD ||
	    par->display_type == DISP_DFP) {
		switch(blank) {
		case FB_BLANK_UNBLANK:
		case FB_BLANK_NORMAL:
			vga_out8(0x3c4, 0x31, par); /* SR31 bit 4 - FP enable */
			vga_out8(0x3c5, vga_in8(0x3c5, par) | 0x10, par);
			break;
		case FB_BLANK_VSYNC_SUSPEND:
		case FB_BLANK_HSYNC_SUSPEND:
		case FB_BLANK_POWERDOWN:
			vga_out8(0x3c4, 0x31, par); /* SR31 bit 4 - FP enable */
			vga_out8(0x3c5, vga_in8(0x3c5, par) & ~0x10, par);
			break;
		}
	}

	return (blank == FB_BLANK_NORMAL) ? 1 : 0;
}

static void savagefb_save_state(struct fb_info *info)
{
	struct savagefb_par *par = info->par;

	savage_get_default_par(par, &par->save);
}

static void savagefb_restore_state(struct fb_info *info)
{
	struct savagefb_par *par = info->par;

	savagefb_blank(FB_BLANK_POWERDOWN, info);
	savage_set_default_par(par, &par->save);
	savagefb_blank(FB_BLANK_UNBLANK, info);
}

static int savagefb_open(struct fb_info *info, int user)
{
	struct savagefb_par *par = info->par;

	mutex_lock(&par->open_lock);

	if (!par->open_count) {
		memset(&par->vgastate, 0, sizeof(par->vgastate));
		par->vgastate.flags = VGA_SAVE_CMAP | VGA_SAVE_FONTS |
			VGA_SAVE_MODE;
		par->vgastate.vgabase = par->mmio.vbase + 0x8000;
		save_vga(&par->vgastate);
		savage_get_default_par(par, &par->initial);
	}

	par->open_count++;
	mutex_unlock(&par->open_lock);
	return 0;
}

static int savagefb_release(struct fb_info *info, int user)
{
	struct savagefb_par *par = info->par;

	mutex_lock(&par->open_lock);

	if (par->open_count == 1) {
		savage_set_default_par(par, &par->initial);
		restore_vga(&par->vgastate);
	}

	par->open_count--;
	mutex_unlock(&par->open_lock);
	return 0;
}

static struct fb_ops savagefb_ops = {
	.owner          = THIS_MODULE,
	.fb_open        = savagefb_open,
	.fb_release     = savagefb_release,
	.fb_check_var   = savagefb_check_var,
	.fb_set_par     = savagefb_set_par,
	.fb_setcolreg   = savagefb_setcolreg,
	.fb_pan_display = savagefb_pan_display,
	.fb_blank       = savagefb_blank,
	.fb_save_state  = savagefb_save_state,
	.fb_restore_state = savagefb_restore_state,
#if defined(CONFIG_FB_SAVAGE_ACCEL)
	.fb_fillrect    = savagefb_fillrect,
	.fb_copyarea    = savagefb_copyarea,
	.fb_imageblit   = savagefb_imageblit,
	.fb_sync        = savagefb_sync,
#else
	.fb_fillrect    = cfb_fillrect,
	.fb_copyarea    = cfb_copyarea,
	.fb_imageblit   = cfb_imageblit,
#endif
};

/* --------------------------------------------------------------------- */

static struct fb_var_screeninfo __devinitdata savagefb_var800x600x8 = {
	.accel_flags =	FB_ACCELF_TEXT,
	.xres =		800,
	.yres =		600,
	.xres_virtual =  800,
	.yres_virtual =  600,
	.bits_per_pixel = 8,
	.pixclock =	25000,
	.left_margin =	88,
	.right_margin =	40,
	.upper_margin =	23,
	.lower_margin =	1,
	.hsync_len =	128,
	.vsync_len =	4,
	.sync =		FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT,
	.vmode =	FB_VMODE_NONINTERLACED
};

static void savage_enable_mmio(struct savagefb_par *par)
{
	unsigned char val;

	DBG("savage_enable_mmio\n");

	val = vga_in8(0x3c3, par);
	vga_out8(0x3c3, val | 0x01, par);
	val = vga_in8(0x3cc, par);
	vga_out8(0x3c2, val | 0x01, par);

	if (par->chip >= S3_SAVAGE4) {
		vga_out8(0x3d4, 0x40, par);
		val = vga_in8(0x3d5, par);
		vga_out8(0x3d5, val | 1, par);
	}
}


static void savage_disable_mmio(struct savagefb_par *par)
{
	unsigned char val;

	DBG("savage_disable_mmio\n");

	if (par->chip >= S3_SAVAGE4) {
		vga_out8(0x3d4, 0x40, par);
		val = vga_in8(0x3d5, par);
		vga_out8(0x3d5, val | 1, par);
	}
}


static int __devinit savage_map_mmio(struct fb_info *info)
{
	struct savagefb_par *par = info->par;
	DBG("savage_map_mmio");

	if (S3_SAVAGE3D_SERIES(par->chip))
		par->mmio.pbase = pci_resource_start(par->pcidev, 0) +
			SAVAGE_NEWMMIO_REGBASE_S3;
	else
		par->mmio.pbase = pci_resource_start(par->pcidev, 0) +
			SAVAGE_NEWMMIO_REGBASE_S4;

	par->mmio.len = SAVAGE_NEWMMIO_REGSIZE;

	par->mmio.vbase = ioremap(par->mmio.pbase, par->mmio.len);
	if (!par->mmio.vbase) {
		printk("savagefb: unable to map memory mapped IO\n");
		return -ENOMEM;
	} else
		printk(KERN_INFO "savagefb: mapped io at %p\n",
			par->mmio.vbase);

	info->fix.mmio_start = par->mmio.pbase;
	info->fix.mmio_len   = par->mmio.len;

	par->bci_base = (u32 __iomem *)(par->mmio.vbase + BCI_BUFFER_OFFSET);
	par->bci_ptr  = 0;

	savage_enable_mmio(par);

	return 0;
}

static void savage_unmap_mmio(struct fb_info *info)
{
	struct savagefb_par *par = info->par;
	DBG("savage_unmap_mmio");

	savage_disable_mmio(par);

	if (par->mmio.vbase) {
		iounmap(par->mmio.vbase);
		par->mmio.vbase = NULL;
	}
}

static int __devinit savage_map_video(struct fb_info *info,
				      int video_len)
{
	struct savagefb_par *par = info->par;
	int resource;

	DBG("savage_map_video");

	if (S3_SAVAGE3D_SERIES(par->chip))
		resource = 0;
	else
		resource = 1;

	par->video.pbase = pci_resource_start(par->pcidev, resource);
	par->video.len   = video_len;
	par->video.vbase = ioremap(par->video.pbase, par->video.len);

	if (!par->video.vbase) {
		printk("savagefb: unable to map screen memory\n");
		return -ENOMEM;
	} else
		printk(KERN_INFO "savagefb: mapped framebuffer at %p, "
		       "pbase == %x\n", par->video.vbase, par->video.pbase);

	info->fix.smem_start = par->video.pbase;
	info->fix.smem_len   = par->video.len - par->cob_size;
	info->screen_base    = par->video.vbase;

#ifdef CONFIG_MTRR
	par->video.mtrr = mtrr_add(par->video.pbase, video_len,
				   MTRR_TYPE_WRCOMB, 1);
#endif

	/* Clear framebuffer, it's all white in memory after boot */
	memset_io(par->video.vbase, 0, par->video.len);

	return 0;
}

static void savage_unmap_video(struct fb_info *info)
{
	struct savagefb_par *par = info->par;

	DBG("savage_unmap_video");

	if (par->video.vbase) {
#ifdef CONFIG_MTRR
		mtrr_del(par->video.mtrr, par->video.pbase, par->video.len);
#endif

		iounmap(par->video.vbase);
		par->video.vbase = NULL;
		info->screen_base = NULL;
	}
}

static int savage_init_hw(struct savagefb_par *par)
{
	unsigned char config1, m, n, n1, n2, sr8, cr3f, cr66 = 0, tmp;

	static unsigned char RamSavage3D[] = { 8, 4, 4, 2 };
	static unsigned char RamSavage4[] =  { 2, 4, 8, 12, 16, 32, 64, 32 };
	static unsigned char RamSavageMX[] = { 2, 8, 4, 16, 8, 16, 4, 16 };
	static unsigned char RamSavageNB[] = { 0, 2, 4, 8, 16, 32, 2, 2 };
	int videoRam, videoRambytes, dvi;

	DBG("savage_init_hw");

	/* unprotect CRTC[0-7] */
	vga_out8(0x3d4, 0x11, par);
	tmp = vga_in8(0x3d5, par);
	vga_out8(0x3d5, tmp & 0x7f, par);

	/* unlock extended regs */
	vga_out16(0x3d4, 0x4838, par);
	vga_out16(0x3d4, 0xa039, par);
	vga_out16(0x3c4, 0x0608, par);

	vga_out8(0x3d4, 0x40, par);
	tmp = vga_in8(0x3d5, par);
	vga_out8(0x3d5, tmp & ~0x01, par);

	/* unlock sys regs */
	vga_out8(0x3d4, 0x38, par);
	vga_out8(0x3d5, 0x48, par);

	/* Unlock system registers. */
	vga_out16(0x3d4, 0x4838, par);

	/* Next go on to detect amount of installed ram */

	vga_out8(0x3d4, 0x36, par);            /* for register CR36 (CONFG_REG1), */
	config1 = vga_in8(0x3d5, par);    /* get amount of vram installed */

	/* Compute the amount of video memory and offscreen memory. */

	switch  (par->chip) {
	case S3_SAVAGE3D:
		videoRam = RamSavage3D[(config1 & 0xC0) >> 6 ] * 1024;
		break;

	case S3_SAVAGE4:
		/*
		 * The Savage4 has one ugly special case to consider.  On
		 * systems with 4 banks of 2Mx32 SDRAM, the BIOS says 4MB
		 * when it really means 8MB.  Why do it the same when you
		 * can do it different...
		 */
		vga_out8(0x3d4, 0x68, par);	/* memory control 1 */
		if ((vga_in8(0x3d5, par) & 0xC0) == (0x01 << 6))
			RamSavage4[1] = 8;

		/*FALLTHROUGH*/

	case S3_SAVAGE2000:
		videoRam = RamSavage4[(config1 & 0xE0) >> 5] * 1024;
		break;

	case S3_SAVAGE_MX:
	case S3_SUPERSAVAGE:
		videoRam = RamSavageMX[(config1 & 0x0E) >> 1] * 1024;
		break;

	case S3_PROSAVAGE:
		videoRam = RamSavageNB[(config1 & 0xE0) >> 5] * 1024;
		break;

	default:
		/* How did we get here? */
		videoRam = 0;
		break;
	}

	videoRambytes = videoRam * 1024;

	printk(KERN_INFO "savagefb: probed videoram:  %dk\n", videoRam);

	/* reset graphics engine to avoid memory corruption */
	vga_out8(0x3d4, 0x66, par);
	cr66 = vga_in8(0x3d5, par);
	vga_out8(0x3d5, cr66 | 0x02, par);
	udelay(10000);

	vga_out8(0x3d4, 0x66, par);
	vga_out8(0x3d5, cr66 & ~0x02, par);	/* clear reset flag */
	udelay(10000);


	/*
	 * reset memory interface, 3D engine, AGP master, PCI master,
	 * master engine unit, motion compensation/LPB
	 */
	vga_out8(0x3d4, 0x3f, par);
	cr3f = vga_in8(0x3d5, par);
	vga_out8(0x3d5, cr3f | 0x08, par);
	udelay(10000);

	vga_out8(0x3d4, 0x3f, par);
	vga_out8(0x3d5, cr3f & ~0x08, par);	/* clear reset flags */
	udelay(10000);

	/* Savage ramdac speeds */
	par->numClocks = 4;
	par->clock[0] = 250000;
	par->clock[1] = 250000;
	par->clock[2] = 220000;
	par->clock[3] = 220000;

	/* detect current mclk */
	vga_out8(0x3c4, 0x08, par);
	sr8 = vga_in8(0x3c5, par);
	vga_out8(0x3c5, 0x06, par);
	vga_out8(0x3c4, 0x10, par);
	n = vga_in8(0x3c5, par);
	vga_out8(0x3c4, 0x11, par);
	m = vga_in8(0x3c5, par);
	vga_out8(0x3c4, 0x08, par);
	vga_out8(0x3c5, sr8, par);
	m &= 0x7f;
	n1 = n & 0x1f;
	n2 = (n >> 5) & 0x03;
	par->MCLK = ((1431818 * (m+2)) / (n1+2) / (1 << n2) + 50) / 100;
	printk(KERN_INFO "savagefb: Detected current MCLK value of %d kHz\n",
		par->MCLK);

	/* check for DVI/flat panel */
	dvi = 0;

	if (par->chip == S3_SAVAGE4) {
		unsigned char sr30 = 0x00;

		vga_out8(0x3c4, 0x30, par);
		/* clear bit 1 */
		vga_out8(0x3c5, vga_in8(0x3c5, par) & ~0x02, par);
		sr30 = vga_in8(0x3c5, par);
		if (sr30 & 0x02 /*0x04 */) {
			dvi = 1;
			printk("savagefb: Digital Flat Panel Detected\n");
		}
	}

	if (S3_SAVAGE_MOBILE_SERIES(par->chip) && !par->crtonly)
		par->display_type = DISP_LCD;
	else if (dvi || (par->chip == S3_SAVAGE4 && par->dvi))
		par->display_type = DISP_DFP;
	else
		par->display_type = DISP_CRT;

	/* Check LCD panel parrmation */

	if (par->display_type == DISP_LCD) {
		unsigned char cr6b = VGArCR(0x6b, par);

		int panelX = (VGArSEQ(0x61, par) +
			      ((VGArSEQ(0x66, par) & 0x02) << 7) + 1) * 8;
		int panelY = (VGArSEQ(0x69, par) +
			      ((VGArSEQ(0x6e, par) & 0x70) << 4) + 1);

		char * sTechnology = "Unknown";

		/* OK, I admit it.  I don't know how to limit the max dot clock
		 * for LCD panels of various sizes.  I thought I copied the
		 * formula from the BIOS, but many users have parrmed me of
		 * my folly.
		 *
		 * Instead, I'll abandon any attempt to automatically limit the
		 * clock, and add an LCDClock option to XF86Config.  Some day,
		 * I should come back to this.
		 */

		enum ACTIVE_DISPLAYS { /* These are the bits in CR6B */
			ActiveCRT = 0x01,
			ActiveLCD = 0x02,
			ActiveTV = 0x04,
			ActiveCRT2 = 0x20,
			ActiveDUO = 0x80
		};

		if ((VGArSEQ(0x39, par) & 0x03) == 0) {
			sTechnology = "TFT";
		} else if ((VGArSEQ(0x30, par) & 0x01) == 0) {
			sTechnology = "DSTN";
		} else 	{
			sTechnology = "STN";
		}

		printk(KERN_INFO "savagefb: %dx%d %s LCD panel detected %s\n",
		       panelX, panelY, sTechnology,
		       cr6b & ActiveLCD ? "and active" : "but not active");