vmlfb: framebuffer driver for Intel Vermilion Range

Add the Intel Vermilion Range framebuffer support.

Signed-off-by: Alan Hourihane <alanh@tungstengraphics.com>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1195 insertions, 0 deletions

diff --git a/drivers/video/vermilion/vermilion.c b/drivers/video/vermilion/vermilion.c
new file mode 100644
index 00000000000..de531c90771
--- /dev/null
+++ b/drivers/video/vermilion/vermilion.c
@@ -0,0 +1,1195 @@
+/*
+ * Copyright (c) Intel Corp. 2007.
+ * All Rights Reserved.
+ *
+ * Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
+ * develop this driver.
+ *
+ * This file is part of the Vermilion Range fb driver.
+ * The Vermilion Range fb driver is free software;
+ * you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * The Vermilion Range fb driver is distributed
+ * in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this driver; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Authors:
+ *   Thomas Hellström <thomas-at-tungstengraphics-dot-com>
+ *   Michel Dänzer <michel-at-tungstengraphics-dot-com>
+ *   Alan Hourihane <alanh-at-tungstengraphics-dot-com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/delay.h>
+#include <linux/mm.h>
+#include <linux/fb.h>
+#include <linux/pci.h>
+#include <asm/cacheflush.h>
+#include <asm/tlbflush.h>
+#include <linux/mmzone.h>
+#include <asm/uaccess.h>
+
+/* #define VERMILION_DEBUG */
+
+#include "vermilion.h"
+
+#define MODULE_NAME "vmlfb"
+
+#define VML_TOHW(_val, _width) ((((_val) << (_width)) + 0x7FFF - (_val)) >> 16)
+
+static struct mutex vml_mutex;
+static struct list_head global_no_mode;
+static struct list_head global_has_mode;
+static struct fb_ops vmlfb_ops;
+static struct vml_sys *subsys = NULL;
+static char *vml_default_mode = "1024x768@60";
+static struct fb_videomode defaultmode = {
+	NULL, 60, 1024, 768, 12896, 144, 24, 29, 3, 136, 6,
+	0, FB_VMODE_NONINTERLACED
+};
+
+static u32 vml_mem_requested = (10 * 1024 * 1024);
+static u32 vml_mem_contig = (4 * 1024 * 1024);
+static u32 vml_mem_min = (4 * 1024 * 1024);
+
+static u32 vml_clocks[] = {
+	6750,
+	13500,
+	27000,
+	29700,
+	37125,
+	54000,
+	59400,
+	74250,
+	120000,
+	148500
+};
+
+static u32 vml_num_clocks = ARRAY_SIZE(vml_clocks);
+
+/*
+ * Allocate a contiguous vram area and make its linear kernel map
+ * uncached.
+ */
+
+static int vmlfb_alloc_vram_area(struct vram_area *va, unsigned max_order,
+				 unsigned min_order)
+{
+	gfp_t flags;
+	unsigned long i;
+	pgprot_t wc_pageprot;
+
+	wc_pageprot = PAGE_KERNEL_NOCACHE;
+	max_order++;
+	do {
+		/*
+		 * Really try hard to get the needed memory.
+		 * We need memory below the first 32MB, so we
+		 * add the __GFP_DMA flag that guarantees that we are
+		 * below the first 16MB.
+		 */
+
+		flags = __GFP_DMA | __GFP_HIGH;
+		va->logical =
+			 __get_free_pages(flags, --max_order);
+	} while (va->logical == 0 && max_order > min_order);
+
+	if (!va->logical)
+		return -ENOMEM;
+
+	va->phys = virt_to_phys((void *)va->logical);
+	va->size = PAGE_SIZE << max_order;
+	va->order = max_order;
+
+	/*
+	 * It seems like __get_free_pages only ups the usage count
+	 * of the first page. This doesn't work with nopage mapping, so
+	 * up the usage count once more.
+	 */
+
+	memset((void *)va->logical, 0x00, va->size);
+	for (i = va->logical; i < va->logical + va->size; i += PAGE_SIZE) {
+		get_page(virt_to_page(i));
+	}
+
+	/*
+	 * Change caching policy of the linear kernel map to avoid
+	 * mapping type conflicts with user-space mappings.
+	 * The first global_flush_tlb() is really only there to do a global
+	 * wbinvd().
+	 */
+
+	global_flush_tlb();
+	change_page_attr(virt_to_page(va->logical), va->size >> PAGE_SHIFT,
+			 wc_pageprot);
+	global_flush_tlb();
+
+	printk(KERN_DEBUG MODULE_NAME
+	       ": Allocated %ld bytes vram area at 0x%08lx\n",
+	       va->size, va->phys);
+
+	return 0;
+}
+
+/*
+ * Free a contiguous vram area and reset its linear kernel map
+ * mapping type.
+ */
+
+static void vmlfb_free_vram_area(struct vram_area *va)
+{
+	unsigned long j;
+
+	if (va->logical) {
+
+		/*
+		 * Reset the linear kernel map caching policy.
+		 */
+
+		change_page_attr(virt_to_page(va->logical),
+				 va->size >> PAGE_SHIFT, PAGE_KERNEL);
+		global_flush_tlb();
+
+		/*
+		 * Decrease the usage count on the pages we've used
+		 * to compensate for upping when allocating.
+		 */
+
+		for (j = va->logical; j < va->logical + va->size;
+		     j += PAGE_SIZE) {
+			(void)put_page_testzero(virt_to_page(j));
+		}
+
+		printk(KERN_DEBUG MODULE_NAME
+		       ": Freeing %ld bytes vram area at 0x%08lx\n",
+		       va->size, va->phys);
+		free_pages(va->logical, va->order);
+
+		va->logical = 0;
+	}
+}
+
+/*
+ * Free allocated vram.
+ */
+
+static void vmlfb_free_vram(struct vml_info *vinfo)
+{
+	int i;
+
+	for (i = 0; i < vinfo->num_areas; ++i) {
+		vmlfb_free_vram_area(&vinfo->vram[i]);
+	}
+	vinfo->num_areas = 0;
+}
+
+/*
+ * Allocate vram. Currently we try to allocate contiguous areas from the
+ * __GFP_DMA zone and puzzle them together. A better approach would be to
+ * allocate one contiguous area for scanout and use one-page allocations for
+ * offscreen areas. This requires user-space and GPU virtual mappings.
+ */
+
+static int vmlfb_alloc_vram(struct vml_info *vinfo,
+			    size_t requested,
+			    size_t min_total, size_t min_contig)
+{
+	int i, j;
+	int order;
+	int contiguous;
+	int err;
+	struct vram_area *va;
+	struct vram_area *va2;
+
+	vinfo->num_areas = 0;
+	for (i = 0; i < VML_VRAM_AREAS; ++i) {
+		va = &vinfo->vram[i];
+		order = 0;
+
+		while (requested > (PAGE_SIZE << order) && order < MAX_ORDER)
+			order++;
+
+		err = vmlfb_alloc_vram_area(va, order, 0);
+
+		if (err)
+			break;
+
+		if (i == 0) {
+			vinfo->vram_start = va->phys;
+			vinfo->vram_logical = (void __iomem *) va->logical;
+			vinfo->vram_contig_size = va->size;
+			vinfo->num_areas = 1;
+		} else {
+			contiguous = 0;
+
+			for (j = 0; j < i; ++j) {
+				va2 = &vinfo->vram[j];
+				if (va->phys + va->size == va2->phys ||
+				    va2->phys + va2->size == va->phys) {
+					contiguous = 1;
+					break;
+				}
+			}
+
+			if (contiguous) {
+				vinfo->num_areas++;
+				if (va->phys < vinfo->vram_start) {
+					vinfo->vram_start = va->phys;
+					vinfo->vram_logical =
+						(void __iomem *)va->logical;
+				}
+				vinfo->vram_contig_size += va->size;
+			} else {
+				vmlfb_free_vram_area(va);
+				break;
+			}
+		}
+
+		if (requested < va->size)
+			break;
+		else
+			requested -= va->size;
+	}
+
+	if (vinfo->vram_contig_size > min_total &&
+	    vinfo->vram_contig_size > min_contig) {
+
+		printk(KERN_DEBUG MODULE_NAME
+		       ": Contiguous vram: %ld bytes at physical 0x%08lx.\n",
+		       (unsigned long)vinfo->vram_contig_size,
+		       (unsigned long)vinfo->vram_start);
+
+		return 0;
+	}
+
+	printk(KERN_ERR MODULE_NAME
+	       ": Could not allocate requested minimal amount of vram.\n");
+
+	vmlfb_free_vram(vinfo);
+
+	return -ENOMEM;
+}
+
+/*
+ * Find the GPU to use with our display controller.
+ */
+
+static int vmlfb_get_gpu(struct vml_par *par)
+{
+	mutex_lock(&vml_mutex);
+
+	par->gpu = pci_get_device(PCI_VENDOR_ID_INTEL, VML_DEVICE_GPU, NULL);
+
+	if (!par->gpu) {
+		mutex_unlock(&vml_mutex);
+		return -ENODEV;
+	}
+
+	mutex_unlock(&vml_mutex);
+
+	if (pci_enable_device(par->gpu) < 0)
+		return -ENODEV;
+
+	return 0;
+}
+
+/*
+ * Find a contiguous vram area that contains a given offset from vram start.
+ */
+static int vmlfb_vram_offset(struct vml_info *vinfo, unsigned long offset)
+{
+	unsigned long aoffset;
+	unsigned i;
+
+	for (i = 0; i < vinfo->num_areas; ++i) {
+		aoffset = offset - (vinfo->vram[i].phys - vinfo->vram_start);
+
+		if (aoffset < vinfo->vram[i].size) {
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+/*
+ * Remap the MMIO register spaces of the VDC and the GPU.
+ */
+
+static int vmlfb_enable_mmio(struct vml_par *par)
+{
+	int err;
+
+	par->vdc_mem_base = pci_resource_start(par->vdc, 0);
+	par->vdc_mem_size = pci_resource_len(par->vdc, 0);
+	if (!request_mem_region(par->vdc_mem_base, par->vdc_mem_size, "vmlfb")) {
+		printk(KERN_ERR MODULE_NAME
+		       ": Could not claim display controller MMIO.\n");
+		return -EBUSY;
+	}
+	par->vdc_mem = ioremap_nocache(par->vdc_mem_base, par->vdc_mem_size);
+	if (par->vdc_mem == NULL) {
+		printk(KERN_ERR MODULE_NAME
+		       ": Could not map display controller MMIO.\n");
+		err = -ENOMEM;
+		goto out_err_0;
+	}
+
+	par->gpu_mem_base = pci_resource_start(par->gpu, 0);
+	par->gpu_mem_size = pci_resource_len(par->gpu, 0);
+	if (!request_mem_region(par->gpu_mem_base, par->gpu_mem_size, "vmlfb")) {
+		printk(KERN_ERR MODULE_NAME ": Could not claim GPU MMIO.\n");
+		err = -EBUSY;
+		goto out_err_1;
+	}
+	par->gpu_mem = ioremap_nocache(par->gpu_mem_base, par->gpu_mem_size);
+	if (par->gpu_mem == NULL) {
+		printk(KERN_ERR MODULE_NAME ": Could not map GPU MMIO.\n");
+		err = -ENOMEM;
+		goto out_err_2;
+	}
+
+	return 0;
+
+out_err_2:
+	release_mem_region(par->gpu_mem_base, par->gpu_mem_size);
+out_err_1:
+	iounmap(par->vdc_mem);
+out_err_0:
+	release_mem_region(par->vdc_mem_base, par->vdc_mem_size);
+	return err;
+}
+
+/*
+ * Unmap the VDC and GPU register spaces.
+ */
+
+static void vmlfb_disable_mmio(struct vml_par *par)
+{
+	iounmap(par->gpu_mem);
+	release_mem_region(par->gpu_mem_base, par->gpu_mem_size);
+	iounmap(par->vdc_mem);
+	release_mem_region(par->vdc_mem_base, par->vdc_mem_size);
+}
+
+/*
+ * Release and uninit the VDC and GPU.
+ */
+
+static void vmlfb_release_devices(struct vml_par *par)
+{
+	if (atomic_dec_and_test(&par->refcount)) {
+		pci_set_drvdata(par->vdc, NULL);
+		pci_disable_device(par->gpu);
+		pci_disable_device(par->vdc);
+	}
+}
+
+/*
+ * Free up allocated resources for a device.
+ */
+
+static void __devexit vml_pci_remove(struct pci_dev *dev)
+{
+	struct fb_info *info;
+	struct vml_info *vinfo;
+	struct vml_par *par;
+
+	info = pci_get_drvdata(dev);
+	if (info) {
+		vinfo = container_of(info, struct vml_info, info);
+		par = vinfo->par;
+		mutex_lock(&vml_mutex);
+		unregister_framebuffer(info);
+		fb_dealloc_cmap(&info->cmap);
+		vmlfb_free_vram(vinfo);
+		vmlfb_disable_mmio(par);
+		vmlfb_release_devices(par);
+		kfree(vinfo);
+		kfree(par);
+		mutex_unlock(&vml_mutex);
+	}
+}
+
+static void vmlfb_set_pref_pixel_format(struct fb_var_screeninfo *var)
+{
+	switch (var->bits_per_pixel) {
+	case 16:
+		var->blue.offset = 0;
+		var->blue.length = 5;
+		var->green.offset = 5;
+		var->green.length = 5;
+		var->red.offset = 10;
+		var->red.length = 5;
+		var->transp.offset = 15;
+		var->transp.length = 1;
+		break;
+	case 32:
+		var->blue.offset = 0;
+		var->blue.length = 8;
+		var->green.offset = 8;
+		var->green.length = 8;
+		var->red.offset = 16;
+		var->red.length = 8;
+		var->transp.offset = 24;
+		var->transp.length = 0;
+		break;
+	default:
+		break;
+	}
+
+	var->blue.msb_right = var->green.msb_right =
+	    var->red.msb_right = var->transp.msb_right = 0;
+}
+
+/*
+ * Device initialization.
+ * We initialize one vml_par struct per device and one vml_info
+ * struct per pipe. Currently we have only one pipe.
+ */
+
+static int __devinit vml_pci_probe(struct pci_dev *dev,
+				   const struct pci_device_id *id)
+{
+	struct vml_info *vinfo;
+	struct fb_info *info;
+	struct vml_par *par;
+	int err = 0;
+
+	par = kzalloc(sizeof(*par), GFP_KERNEL);
+	if (par == NULL)
+		return -ENOMEM;
+
+	vinfo = kzalloc(sizeof(*vinfo), GFP_KERNEL);
+	if (vinfo == NULL) {
+		err = -ENOMEM;
+		goto out_err_0;
+	}
+
+	vinfo->par = par;
+	par->vdc = dev;
+	atomic_set(&par->refcount, 1);
+
+	switch (id->device) {
+	case VML_DEVICE_VDC:
+		if ((err = vmlfb_get_gpu(par)))
+			goto out_err_1;
+		pci_set_drvdata(dev, &vinfo->info);
+		break;
+	default:
+		err = -ENODEV;
+		goto out_err_1;
+		break;
+	}
+
+	info = &vinfo->info;
+	info->flags = FBINFO_DEFAULT | FBINFO_PARTIAL_PAN_OK;
+
+	err = vmlfb_enable_mmio(par);
+	if (err)
+		goto out_err_2;
+
+	err = vmlfb_alloc_vram(vinfo, vml_mem_requested,
+			       vml_mem_contig, vml_mem_min);
+	if (err)
+		goto out_err_3;
+
+	strcpy(info->fix.id, "Vermilion Range");
+	info->fix.mmio_start = 0;
+	info->fix.mmio_len = 0;
+	info->fix.smem_start = vinfo->vram_start;
+	info->fix.smem_len = vinfo->vram_contig_size;
+	info->fix.type = FB_TYPE_PACKED_PIXELS;
+	info->fix.visual = FB_VISUAL_TRUECOLOR;
+	info->fix.ypanstep = 1;
+	info->fix.xpanstep = 1;
+	info->fix.ywrapstep = 0;
+	info->fix.accel = FB_ACCEL_NONE;
+	info->screen_base = vinfo->vram_logical;
+	info->pseudo_palette = vinfo->pseudo_palette;
+	info->par = par;
+	info->fbops = &vmlfb_ops;
+	info->device = &dev->dev;
+
+	INIT_LIST_HEAD(&vinfo->head);
+	vinfo->pipe_disabled = 1;
+	vinfo->cur_blank_mode = FB_BLANK_UNBLANK;
+
+	info->var.grayscale = 0;
+	info->var.bits_per_pixel = 16;
+	vmlfb_set_pref_pixel_format(&info->var);
+
+	if (!fb_find_mode
+	    (&info->var, info, vml_default_mode, NULL, 0, &defaultmode, 16)) {
+		printk(KERN_ERR MODULE_NAME ": Could not find initial mode\n");
+	}
+
+	if (fb_alloc_cmap(&info->cmap, 256, 1) < 0) {
+		err = -ENOMEM;
+		goto out_err_4;
+	}
+
+	err = register_framebuffer(info);
+	if (err) {
+		printk(KERN_ERR MODULE_NAME ": Register framebuffer error.\n");
+		goto out_err_5;
+	}
+
+	printk("Initialized vmlfb\n");
+
+	return 0;
+
+out_err_5:
+	fb_dealloc_cmap(&info->cmap);
+out_err_4:
+	vmlfb_free_vram(vinfo);
+out_err_3:
+	vmlfb_disable_mmio(par);
+out_err_2:
+	vmlfb_release_devices(par);
+out_err_1:
+	kfree(vinfo);
+out_err_0:
+	kfree(par);
+	return err;
+}
+
+static int vmlfb_open(struct fb_info *info, int user)
+{
+	/*
+	 * Save registers here?
+	 */
+	return 0;
+}
+
+static int vmlfb_release(struct fb_info *info, int user)
+{
+	/*
+	 * Restore registers here.
+	 */
+
+	return 0;
+}
+
+static int vml_nearest_clock(int clock)
+{
+
+	int i;
+	int cur_index;
+	int cur_diff;
+	int diff;
+
+	cur_index = 0;
+	cur_diff = clock - vml_clocks[0];
+	cur_diff = (cur_diff < 0) ? -cur_diff : cur_diff;
+	for (i = 1; i < vml_num_clocks; ++i) {
+		diff = clock - vml_clocks[i];
+		diff = (diff < 0) ? -diff : diff;
+		if (diff < cur_diff) {
+			cur_index = i;
+			cur_diff = diff;
+		}
+	}
+	return vml_clocks[cur_index];
+}
+
+static int vmlfb_check_var_locked(struct fb_var_screeninfo *var,
+				  struct vml_info *vinfo)
+{
+	u32 pitch;
+	u64 mem;
+	int nearest_clock;
+	int clock;
+	int clock_diff;
+	struct fb_var_screeninfo v;
+
+	v = *var;
+	clock = PICOS2KHZ(var->pixclock);
+
+	if (subsys && subsys->nearest_clock) {
+		nearest_clock = subsys->nearest_clock(subsys, clock);
+	} else {
+		nearest_clock = vml_nearest_clock(clock);
+	}
+
+	/*
+	 * Accept a 20% diff.
+	 */
+
+	clock_diff = nearest_clock - clock;
+	clock_diff = (clock_diff < 0) ? -clock_diff : clock_diff;
+	if (clock_diff > clock / 5) {
+#if 0
+		printk(KERN_DEBUG MODULE_NAME ": Diff failure. %d %d\n",clock_diff,clock);
+#endif
+		return -EINVAL;
+	}
+
+	v.pixclock = KHZ2PICOS(nearest_clock);
+
+	if (var->xres > VML_MAX_XRES || var->yres > VML_MAX_YRES) {
+		printk(KERN_DEBUG MODULE_NAME ": Resolution failure.\n");
+		return -EINVAL;
+	}
+	if (var->xres_virtual > VML_MAX_XRES_VIRTUAL) {
+		printk(KERN_DEBUG MODULE_NAME
+		       ": Virtual resolution failure.\n");
+		return -EINVAL;
+	}
+	switch (v.bits_per_pixel) {
+	case 0 ... 16:
+		v.bits_per_pixel = 16;
+		break;
+	case 17 ... 32:
+		v.bits_per_pixel = 32;
+		break;
+	default:
+		printk(KERN_DEBUG MODULE_NAME ": Invalid bpp: %d.\n",
+		       var->bits_per_pixel);
+		return -EINVAL;
+	}
+
+	pitch = __ALIGN_MASK((var->xres * var->bits_per_pixel) >> 3, 0x3F);
+	mem = pitch * var->yres_virtual;
+	if (mem > vinfo->vram_contig_size) {
+		return -ENOMEM;
+	}
+
+	switch (v.bits_per_pixel) {
+	case 16:
+		if (var->blue.offset != 0 ||
+		    var->blue.length != 5 ||
+		    var->green.offset != 5 ||
+		    var->green.length != 5 ||
+		    var->red.offset != 10 ||
+		    var->red.length != 5 ||
+		    var->transp.offset != 15 || var->transp.length != 1) {
+			vmlfb_set_pref_pixel_format(&v);
+		}
+		break;
+	case 32:
+		if (var->blue.offset != 0 ||
+		    var->blue.length != 8 ||
+		    var->green.offset != 8 ||
+		    var->green.length != 8 ||
+		    var->red.offset != 16 ||
+		    var->red.length != 8 ||
+		    (var->transp.length != 0 && var->transp.length != 8) ||
+		    (var->transp.length == 8 && var->transp.offset != 24)) {
+			vmlfb_set_pref_pixel_format(&v);
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	*var = v;
+
+	return 0;
+}
+
+static int vmlfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
+{
+	struct vml_info *vinfo = container_of(info, struct vml_info, info);
+	int ret;
+
+	mutex_lock(&vml_mutex);
+	ret = vmlfb_check_var_locked(var, vinfo);
+	mutex_unlock(&vml_mutex);
+
+	return ret;
+}
+
+static void vml_wait_vblank(struct vml_info *vinfo)
+{
+	/* Wait for vblank. For now, just wait for a 50Hz cycle (20ms)) */
+	mdelay(20);
+}
+
+static void vmlfb_disable_pipe(struct vml_info *vinfo)
+{
+	struct vml_par *par = vinfo->par;
+
+	/* Disable the MDVO pad */
+	VML_WRITE32(par, VML_RCOMPSTAT, 0);
+	while (!(VML_READ32(par, VML_RCOMPSTAT) & VML_MDVO_VDC_I_RCOMP)) ;
+
+	/* Disable display planes */
+	VML_WRITE32(par, VML_DSPCCNTR,
+		    VML_READ32(par, VML_DSPCCNTR) & ~VML_GFX_ENABLE);
+	(void)VML_READ32(par, VML_DSPCCNTR);
+	/* Wait for vblank for the disable to take effect */
+	vml_wait_vblank(vinfo);
+
+	/* Next, disable display pipes */
+	VML_WRITE32(par, VML_PIPEACONF, 0);
+	(void)VML_READ32(par, VML_PIPEACONF);
+
+	vinfo->pipe_disabled = 1;
+}
+
+#ifdef VERMILION_DEBUG
+static void vml_dump_regs(struct vml_info *vinfo)
+{
+	struct vml_par *par = vinfo->par;
+
+	printk(KERN_DEBUG MODULE_NAME ": Modesetting register dump:\n");
+	printk(KERN_DEBUG MODULE_NAME ": \tHTOTAL_A         : 0x%08x\n",
+	       (unsigned)VML_READ32(par, VML_HTOTAL_A));
+	printk(KERN_DEBUG MODULE_NAME ": \tHBLANK_A         : 0x%08x\n",
+	       (unsigned)VML_READ32(par, VML_HBLANK_A));
+	printk(KERN_DEBUG MODULE_NAME ": \tHSYNC_A          : 0x%08x\n",
+	       (unsigned)VML_READ32(par, VML_HSYNC_A));
+	printk(KERN_DEBUG MODULE_NAME ": \tVTOTAL_A         : 0x%08x\n",
+	       (unsigned)VML_READ32(par, VML_VTOTAL_A));
+	printk(KERN_DEBUG MODULE_NAME ": \tVBLANK_A         : 0x%08x\n",
+	       (unsigned)VML_READ32(par, VML_VBLANK_A));
+	printk(KERN_DEBUG MODULE_NAME ": \tVSYNC_A          : 0x%08x\n",
+	       (unsigned)VML_READ32(par, VML_VSYNC_A));
+	printk(KERN_DEBUG MODULE_NAME ": \tDSPCSTRIDE       : 0x%08x\n",
+	       (unsigned)VML_READ32(par, VML_DSPCSTRIDE));
+	printk(KERN_DEBUG MODULE_NAME ": \tDSPCSIZE         : 0x%08x\n",
+	       (unsigned)VML_READ32(par, VML_DSPCSIZE));
+	printk(KERN_DEBUG MODULE_NAME ": \tDSPCPOS          : 0x%08x\n",
+	       (unsigned)VML_READ32(par, VML_DSPCPOS));
+	printk(KERN_DEBUG MODULE_NAME ": \tDSPARB           : 0x%08x\n",
+	       (unsigned)VML_READ32(par, VML_DSPARB));
+	printk(KERN_DEBUG MODULE_NAME ": \tDSPCADDR         : 0x%08x\n",
+	       (unsigned)VML_READ32(par, VML_DSPCADDR));
+	printk(KERN_DEBUG MODULE_NAME ": \tBCLRPAT_A        : 0x%08x\n",
+	       (unsigned)VML_READ32(par, VML_BCLRPAT_A));
+	printk(KERN_DEBUG MODULE_NAME ": \tCANVSCLR_A       : 0x%08x\n",
+	       (unsigned)VML_READ32(par, VML_CANVSCLR_A));
+	printk(KERN_DEBUG MODULE_NAME ": \tPIPEASRC         : 0x%08x\n",
+	       (unsigned)VML_READ32(par, VML_PIPEASRC));
+	printk(KERN_DEBUG MODULE_NAME ": \tPIPEACONF        : 0x%08x\n",
+	       (unsigned)VML_READ32(par, VML_PIPEACONF));
+	printk(KERN_DEBUG MODULE_NAME ": \tDSPCCNTR         : 0x%08x\n",
+	       (unsigned)VML_READ32(par, VML_DSPCCNTR));
+	printk(KERN_DEBUG MODULE_NAME ": \tRCOMPSTAT        : 0x%08x\n",
+	       (unsigned)VML_READ32(par, VML_RCOMPSTAT));
+	printk(KERN_DEBUG MODULE_NAME ": End of modesetting register dump.\n");
+}
+#endif
+
+static int vmlfb_set_par_locked(struct vml_info *vinfo)
+{
+	struct vml_par *par = vinfo->par;
+	struct fb_info *info = &vinfo->info;
+	struct fb_var_screeninfo *var = &info->var;
+	u32 htotal, hactive, hblank_start, hblank_end, hsync_start, hsync_end;
+	u32 vtotal, vactive, vblank_start, vblank_end, vsync_start, vsync_end;
+	u32 dspcntr;
+	int clock;
+
+	vinfo->bytes_per_pixel = var->bits_per_pixel >> 3;
+	vinfo->stride =
+	    __ALIGN_MASK(var->xres_virtual * vinfo->bytes_per_pixel, 0x3F);
+	info->fix.line_length = vinfo->stride;
+
+	if (!subsys)
+		return 0;
+
+	htotal =
+	    var->xres + var->right_margin + var->hsync_len + var->left_margin;
+	hactive = var->xres;
+	hblank_start = var->xres;
+	hblank_end = htotal;
+	hsync_start = hactive + var->right_margin;
+	hsync_end = hsync_start + var->hsync_len;
+
+	vtotal =
+	    var->yres + var->lower_margin + var->vsync_len + var->upper_margin;
+	vactive = var->yres;
+	vblank_start = var->yres;
+	vblank_end = vtotal;
+	vsync_start = vactive + var->lower_margin;
+	vsync_end = vsync_start + var->vsync_len;
+
+	dspcntr = VML_GFX_ENABLE | VML_GFX_GAMMABYPASS;
+	clock = PICOS2KHZ(var->pixclock);
+
+	if (subsys->nearest_clock) {
+		clock = subsys->nearest_clock(subsys, clock);
+	} else {
+		clock = vml_nearest_clock(clock);
+	}
+	printk(KERN_DEBUG MODULE_NAME
+	       ": Set mode Hfreq : %d kHz, Vfreq : %d Hz.\n", clock / htotal,
+	       ((clock / htotal) * 1000) / vtotal);
+
+	switch (var->bits_per_pixel) {
+	case 16:
+		dspcntr |= VML_GFX_ARGB1555;
+		break;
+	case 32:
+		if (var->transp.length == 8)
+			dspcntr |= VML_GFX_ARGB8888 | VML_GFX_ALPHAMULT;
+		else
+			dspcntr |= VML_GFX_RGB0888;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	vmlfb_disable_pipe(vinfo);
+	mb();
+
+	if (subsys->set_clock)
+		subsys->set_clock(subsys, clock);
+	else
+		return -EINVAL;
+
+	VML_WRITE32(par, VML_HTOTAL_A, ((htotal - 1) << 16) | (hactive - 1));
+	VML_WRITE32(par, VML_HBLANK_A,
+		    ((hblank_end - 1) << 16) | (hblank_start - 1));
+	VML_WRITE32(par, VML_HSYNC_A,
+		    ((hsync_end - 1) << 16) | (hsync_start - 1));
+	VML_WRITE32(par, VML_VTOTAL_A, ((vtotal - 1) << 16) | (vactive - 1));
+	VML_WRITE32(par, VML_VBLANK_A,
+		    ((vblank_end - 1) << 16) | (vblank_start - 1));
+	VML_WRITE32(par, VML_VSYNC_A,
+		    ((vsync_end - 1) << 16) | (vsync_start - 1));
+	VML_WRITE32(par, VML_DSPCSTRIDE, vinfo->stride);
+	VML_WRITE32(par, VML_DSPCSIZE,
+		    ((var->yres - 1) << 16) | (var->xres - 1));
+	VML_WRITE32(par, VML_DSPCPOS, 0x00000000);
+	VML_WRITE32(par, VML_DSPARB, VML_FIFO_DEFAULT);
+	VML_WRITE32(par, VML_BCLRPAT_A, 0x00000000);
+	VML_WRITE32(par, VML_CANVSCLR_A, 0x00000000);
+	VML_WRITE32(par, VML_PIPEASRC,
+		    ((var->xres - 1) << 16) | (var->yres - 1));
+
+	wmb();
+	VML_WRITE32(par, VML_PIPEACONF, VML_PIPE_ENABLE);
+	wmb();
+	VML_WRITE32(par, VML_DSPCCNTR, dspcntr);
+	wmb();
+	VML_WRITE32(par, VML_DSPCADDR, (u32) vinfo->vram_start +
+		    var->yoffset * vinfo->stride +
+		    var->xoffset * vinfo->bytes_per_pixel);
+
+	VML_WRITE32(par, VML_RCOMPSTAT, VML_MDVO_PAD_ENABLE);
+
+	while (!(VML_READ32(par, VML_RCOMPSTAT) &
+		 (VML_MDVO_VDC_I_RCOMP | VML_MDVO_PAD_ENABLE))) ;
+
+	vinfo->pipe_disabled = 0;
+#ifdef VERMILION_DEBUG
+	vml_dump_regs(vinfo);
+#endif
+
+	return 0;
+}
+
+static int vmlfb_set_par(struct fb_info *info)
+{
+	struct vml_info *vinfo = container_of(info, struct vml_info, info);
+	int ret;
+
+	mutex_lock(&vml_mutex);
+	list_del(&vinfo->head);
+	list_add(&vinfo->head, (subsys) ? &global_has_mode : &global_no_mode);
+	ret = vmlfb_set_par_locked(vinfo);
+
+	mutex_unlock(&vml_mutex);
+	return ret;
+}
+
+static int vmlfb_blank_locked(struct vml_info *vinfo)
+{
+	struct vml_par *par = vinfo->par;
+	u32 cur = VML_READ32(par, VML_PIPEACONF);
+
+	switch (vinfo->cur_blank_mode) {
+	case FB_BLANK_UNBLANK:
+		if (vinfo->pipe_disabled) {
+			vmlfb_set_par_locked(vinfo);
+		}
+		VML_WRITE32(par, VML_PIPEACONF, cur & ~VML_PIPE_FORCE_BORDER);
+		(void)VML_READ32(par, VML_PIPEACONF);
+		break;
+	case FB_BLANK_NORMAL:
+		if (vinfo->pipe_disabled) {
+			vmlfb_set_par_locked(vinfo);
+		}
+		VML_WRITE32(par, VML_PIPEACONF, cur | VML_PIPE_FORCE_BORDER);
+		(void)VML_READ32(par, VML_PIPEACONF);
+		break;
+	case FB_BLANK_VSYNC_SUSPEND:
+	case FB_BLANK_HSYNC_SUSPEND:
+		if (!vinfo->pipe_disabled) {
+			vmlfb_disable_pipe(vinfo);
+		}
+		break;
+	case FB_BLANK_POWERDOWN:
+		if (!vinfo->pipe_disabled) {
+			vmlfb_disable_pipe(vinfo);
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int vmlfb_blank(int blank_mode, struct fb_info *info)
+{
+	struct vml_info *vinfo = container_of(info, struct vml_info, info);
+	int ret;
+
+	mutex_lock(&vml_mutex);
+	vinfo->cur_blank_mode = blank_mode;
+	ret = vmlfb_blank_locked(vinfo);
+	mutex_unlock(&vml_mutex);
+	return ret;
+}
+
+static int vmlfb_pan_display(struct fb_var_screeninfo *var,
+			     struct fb_info *info)
+{
+	struct vml_info *vinfo = container_of(info, struct vml_info, info);
+	struct vml_par *par = vinfo->par;
+
+	mutex_lock(&vml_mutex);
+	VML_WRITE32(par, VML_DSPCADDR, (u32) vinfo->vram_start +
+		    var->yoffset * vinfo->stride +
+		    var->xoffset * vinfo->bytes_per_pixel);
+	(void)VML_READ32(par, VML_DSPCADDR);
+	mutex_unlock(&vml_mutex);
+
+	return 0;
+}
+
+static int vmlfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
+			   u_int transp, struct fb_info *info)
+{
+	u32 v;
+
+	if (regno >= 16)
+		return -EINVAL;
+
+	if (info->var.grayscale) {
+		red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
+	}
+
+	if (info->fix.visual != FB_VISUAL_TRUECOLOR)
+		return -EINVAL;
+
+	red = VML_TOHW(red, info->var.red.length);
+	blue = VML_TOHW(blue, info->var.blue.length);
+	green = VML_TOHW(green, info->var.green.length);
+	transp = VML_TOHW(transp, info->var.transp.length);
+
+	v = (red << info->var.red.offset) |
+	    (green << info->var.green.offset) |
+	    (blue << info->var.blue.offset) |
+	    (transp << info->var.transp.offset);
+
+	switch (info->var.bits_per_pixel) {
+	case 16:
+		((u32 *) info->pseudo_palette)[regno] = v;
+		break;
+	case 24:
+	case 32:
+		((u32 *) info->pseudo_palette)[regno] = v;
+		break;
+	}
+	return 0;
+}
+
+static int vmlfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
+{
+	struct vml_info *vinfo = container_of(info, struct vml_info, info);
+	unsigned long size = vma->vm_end - vma->vm_start;
+	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
+	int ret;
+
+	if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
+		return -EINVAL;
+	if (offset + size > vinfo->vram_contig_size)
+		return -EINVAL;
+	ret = vmlfb_vram_offset(vinfo, offset);
+	if (ret)
+		return -EINVAL;
+	offset += vinfo->vram_start;
+	pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
+	pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT;
+	vma->vm_flags |= VM_RESERVED | VM_IO;
+	if (remap_pfn_range(vma, vma->vm_start, offset >> PAGE_SHIFT,
+						size, vma->vm_page_prot))
+		return -EAGAIN;
+	return 0;
+}
+
+static int vmlfb_sync(struct fb_info *info)
+{
+	return 0;
+}
+
+static int vmlfb_cursor(struct fb_info *info, struct fb_cursor *cursor)
+{
+	return -EINVAL;	/* just to force soft_cursor() call */
+}
+
+static struct fb_ops vmlfb_ops = {
+	.owner = THIS_MODULE,
+	.fb_open = vmlfb_open,
+	.fb_release = vmlfb_release,
+	.fb_check_var = vmlfb_check_var,
+	.fb_set_par = vmlfb_set_par,
+	.fb_blank = vmlfb_blank,
+	.fb_pan_display = vmlfb_pan_display,
+	.fb_fillrect = cfb_fillrect,
+	.fb_copyarea = cfb_copyarea,
+	.fb_imageblit = cfb_imageblit,
+	.fb_cursor = vmlfb_cursor,
+	.fb_sync = vmlfb_sync,
+	.fb_mmap = vmlfb_mmap,
+	.fb_setcolreg = vmlfb_setcolreg
+};
+
+static struct pci_device_id vml_ids[] = {
+	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, VML_DEVICE_VDC)},
+	{0}
+};
+
+static struct pci_driver vmlfb_pci_driver = {
+	.name = "vmlfb",
+	.id_table = vml_ids,
+	.probe = vml_pci_probe,
+	.remove = __devexit_p(vml_pci_remove)
+};
+
+static void __exit vmlfb_cleanup(void)
+{
+	pci_unregister_driver(&vmlfb_pci_driver);
+}
+
+static int __init vmlfb_init(void)
+{
+
+#ifndef MODULE
+	char *option = NULL;
+
+	if (fb_get_options(MODULE_NAME, &option))
+		return -ENODEV;
+#endif
+
+	printk(KERN_DEBUG MODULE_NAME ": initializing\n");
+	mutex_init(&vml_mutex);
+	INIT_LIST_HEAD(&global_no_mode);
+	INIT_LIST_HEAD(&global_has_mode);
+
+	return pci_register_driver(&vmlfb_pci_driver);
+}
+
+int vmlfb_register_subsys(struct vml_sys *sys)
+{
+	struct vml_info *entry;
+	struct list_head *list;
+	u32 save_activate;
+
+	mutex_lock(&vml_mutex);
+	if (subsys != NULL) {
+		subsys->restore(subsys);
+	}
+	subsys = sys;
+	subsys->save(subsys);
+
+	/*
+	 * We need to restart list traversal for each item, since we
+	 * release the list mutex in the loop.
+	 */
+
+	list = global_no_mode.next;
+	while (list != &global_no_mode) {
+		list_del_init(list);
+		entry = list_entry(list, struct vml_info, head);
+
+		/*
+		 * First, try the current mode which might not be
+		 * completely validated with respect to the pixel clock.
+		 */
+
+		if (!vmlfb_check_var_locked(&entry->info.var, entry)) {
+			vmlfb_set_par_locked(entry);
+			list_add_tail(list, &global_has_mode);
+		} else {
+
+			/*
+			 * Didn't work. Try to find another mode,
+			 * that matches this subsys.
+			 */
+
+			mutex_unlock(&vml_mutex);
+			save_activate = entry->info.var.activate;
+			entry->info.var.bits_per_pixel = 16;
+			vmlfb_set_pref_pixel_format(&entry->info.var);
+			if (fb_find_mode(&entry->info.var,
+					 &entry->info,
+					 vml_default_mode, NULL, 0, NULL, 16)) {
+				entry->info.var.activate |=
+				    FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
+				fb_set_var(&entry->info, &entry->info.var);
+			} else {
+				printk(KERN_ERR MODULE_NAME
+				       ": Sorry. no mode found for this subsys.\n");
+			}
+			entry->info.var.activate = save_activate;
+			mutex_lock(&vml_mutex);
+		}
+		vmlfb_blank_locked(entry);
+		list = global_no_mode.next;
+	}
+	mutex_unlock(&vml_mutex);
+
+	printk(KERN_DEBUG MODULE_NAME ": Registered %s subsystem.\n",
+				subsys->name ? subsys->name : "unknown");
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(vmlfb_register_subsys);
+
+void vmlfb_unregister_subsys(struct vml_sys *sys)
+{
+	struct vml_info *entry, *next;
+
+	mutex_lock(&vml_mutex);
+	if (subsys != sys) {
+		mutex_unlock(&vml_mutex);
+		return;
+	}
+	subsys->restore(subsys);
+	subsys = NULL;
+	list_for_each_entry_safe(entry, next, &global_has_mode, head) {
+		printk(KERN_DEBUG MODULE_NAME ": subsys disable pipe\n");
+		vmlfb_disable_pipe(entry);
+		list_del(&entry->head);
+		list_add_tail(&entry->head, &global_no_mode);
+	}
+	mutex_unlock(&vml_mutex);
+}
+
+EXPORT_SYMBOL_GPL(vmlfb_unregister_subsys);
+
+module_init(vmlfb_init);
+module_exit(vmlfb_cleanup);
+
+MODULE_AUTHOR("Tungsten Graphics");
+MODULE_DESCRIPTION("Initialization of the Vermilion display devices");
+MODULE_VERSION("1.0.0");
+MODULE_LICENSE("GPL");