drivers/gpu/drm/mgag200/mgag200_main.c - kernel/quantenna - Git at Google

 /*
  * Copyright 2010 Matt Turner.
  * Copyright 2012 Red Hat
  *
  * This file is subject to the terms and conditions of the GNU General
  * Public License version 2. See the file COPYING in the main
  * directory of this archive for more details.
  *
  * Authors: Matthew Garrett
  *          Matt Turner
  *          Dave Airlie
  */
 #include <drm/drmP.h>
 #include <drm/drm_crtc_helper.h>
 #include "mgag200_drv.h"

 static void mga_user_framebuffer_destroy(struct drm_framebuffer *fb)
 {
 	struct mga_framebuffer *mga_fb = to_mga_framebuffer(fb);
 	if (mga_fb->obj)
 		drm_gem_object_unreference_unlocked(mga_fb->obj);
 	drm_framebuffer_cleanup(fb);
 	kfree(fb);
 }

 static const struct drm_framebuffer_funcs mga_fb_funcs = {
 	.destroy = mga_user_framebuffer_destroy,
 };

 int mgag200_framebuffer_init(struct drm_device *dev,
 			     struct mga_framebuffer *gfb,
 			     const struct drm_mode_fb_cmd2 *mode_cmd,
 			     struct drm_gem_object *obj)
 {
 	int ret;

 	drm_helper_mode_fill_fb_struct(&gfb->base, mode_cmd);
 	gfb->obj = obj;
 	ret = drm_framebuffer_init(dev, &gfb->base, &mga_fb_funcs);
 	if (ret) {
 		DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
 		return ret;
 	}
 	return 0;
 }

 static struct drm_framebuffer *
 mgag200_user_framebuffer_create(struct drm_device *dev,
 				struct drm_file *filp,
 				const struct drm_mode_fb_cmd2 *mode_cmd)
 {
 	struct drm_gem_object *obj;
 	struct mga_framebuffer *mga_fb;
 	int ret;

 	obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
 	if (obj == NULL)
 		return ERR_PTR(-ENOENT);

 	mga_fb = kzalloc(sizeof(*mga_fb), GFP_KERNEL);
 	if (!mga_fb) {
 		drm_gem_object_unreference_unlocked(obj);
 		return ERR_PTR(-ENOMEM);
 	}

 	ret = mgag200_framebuffer_init(dev, mga_fb, mode_cmd, obj);
 	if (ret) {
 		drm_gem_object_unreference_unlocked(obj);
 		kfree(mga_fb);
 		return ERR_PTR(ret);
 	}
 	return &mga_fb->base;
 }

 static const struct drm_mode_config_funcs mga_mode_funcs = {
 	.fb_create = mgag200_user_framebuffer_create,
 };

 static int mga_probe_vram(struct mga_device *mdev, void __iomem *mem)
 {
 	int offset;
 	int orig;
 	int test1, test2;
 	int orig1, orig2;
 	unsigned int vram_size;

 	/* Probe */
 	orig = ioread16(mem);
 	iowrite16(0, mem);

 	vram_size = mdev->mc.vram_window;

 	if ((mdev->type == G200_EW3) && (vram_size >= 0x1000000)) {
 		vram_size = vram_size - 0x400000;
 	}

 	for (offset = 0x100000; offset < vram_size; offset += 0x4000) {
 		orig1 = ioread8(mem + offset);
 		orig2 = ioread8(mem + offset + 0x100);

 		iowrite16(0xaa55, mem + offset);
 		iowrite16(0xaa55, mem + offset + 0x100);

 		test1 = ioread16(mem + offset);
 		test2 = ioread16(mem);

 		iowrite16(orig1, mem + offset);
 		iowrite16(orig2, mem + offset + 0x100);

 		if (test1 != 0xaa55) {
 			break;
 		}

 		if (test2) {
 			break;
 		}
 	}

 	iowrite16(orig, mem);
 	return offset - 65536;
 }

 /* Map the framebuffer from the card and configure the core */
 static int mga_vram_init(struct mga_device *mdev)
 {
 	void __iomem *mem;
 	struct apertures_struct *aper = alloc_apertures(1);
 	if (!aper)
 		return -ENOMEM;

 	/* BAR 0 is VRAM */
 	mdev->mc.vram_base = pci_resource_start(mdev->dev->pdev, 0);
 	mdev->mc.vram_window = pci_resource_len(mdev->dev->pdev, 0);

 	aper->ranges[0].base = mdev->mc.vram_base;
 	aper->ranges[0].size = mdev->mc.vram_window;

 	remove_conflicting_framebuffers(aper, "mgafb", true);
 	kfree(aper);

 	if (!devm_request_mem_region(mdev->dev->dev, mdev->mc.vram_base, mdev->mc.vram_window,
 				"mgadrmfb_vram")) {
 		DRM_ERROR("can't reserve VRAM\n");
 		return -ENXIO;
 	}

 	mem = pci_iomap(mdev->dev->pdev, 0, 0);

 	mdev->mc.vram_size = mga_probe_vram(mdev, mem);

 	pci_iounmap(mdev->dev->pdev, mem);

 	return 0;
 }

 static int mgag200_device_init(struct drm_device *dev,
 			       uint32_t flags)
 {
 	struct mga_device *mdev = dev->dev_private;
 	int ret, option;

 	mdev->type = flags;

 	/* Hardcode the number of CRTCs to 1 */
 	mdev->num_crtc = 1;

 	pci_read_config_dword(dev->pdev, PCI_MGA_OPTION, &option);
 	mdev->has_sdram = !(option & (1 << 14));

 	/* BAR 0 is the framebuffer, BAR 1 contains registers */
 	mdev->rmmio_base = pci_resource_start(mdev->dev->pdev, 1);
 	mdev->rmmio_size = pci_resource_len(mdev->dev->pdev, 1);

 	if (!devm_request_mem_region(mdev->dev->dev, mdev->rmmio_base, mdev->rmmio_size,
 				"mgadrmfb_mmio")) {
 		DRM_ERROR("can't reserve mmio registers\n");
 		return -ENOMEM;
 	}

 	mdev->rmmio = pcim_iomap(dev->pdev, 1, 0);
 	if (mdev->rmmio == NULL)
 		return -ENOMEM;

 	/* stash G200 SE model number for later use */
 	if (IS_G200_SE(mdev))
 		mdev->unique_rev_id = RREG32(0x1e24);

 	ret = mga_vram_init(mdev);
 	if (ret)
 		return ret;

 	mdev->bpp_shifts[0] = 0;
 	mdev->bpp_shifts[1] = 1;
 	mdev->bpp_shifts[2] = 0;
 	mdev->bpp_shifts[3] = 2;
 	return 0;
 }

 /*
  * Functions here will be called by the core once it's bound the driver to
  * a PCI device
  */


 int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
 {
 	struct mga_device *mdev;
 	int r;

 	mdev = devm_kzalloc(dev->dev, sizeof(struct mga_device), GFP_KERNEL);
 	if (mdev == NULL)
 		return -ENOMEM;
 	dev->dev_private = (void *)mdev;
 	mdev->dev = dev;

 	r = mgag200_device_init(dev, flags);
 	if (r) {
 		dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
 		return r;
 	}
 	r = mgag200_mm_init(mdev);
 	if (r)
 		goto err_mm;

 	drm_mode_config_init(dev);
 	dev->mode_config.funcs = (void *)&mga_mode_funcs;
 	if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
 		dev->mode_config.preferred_depth = 16;
 	else
 		dev->mode_config.preferred_depth = 24;
 	dev->mode_config.prefer_shadow = 1;

 	r = mgag200_modeset_init(mdev);
 	if (r) {
 		dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
 		goto err_modeset;
 	}

 	/* Make small buffers to store a hardware cursor (double buffered icon updates) */
 	mgag200_bo_create(dev, roundup(48*64, PAGE_SIZE), 0, 0,
 					  &mdev->cursor.pixels_1);
 	mgag200_bo_create(dev, roundup(48*64, PAGE_SIZE), 0, 0,
 					  &mdev->cursor.pixels_2);
 	if (!mdev->cursor.pixels_2 || !mdev->cursor.pixels_1) {
 		mdev->cursor.pixels_1 = NULL;
 		mdev->cursor.pixels_2 = NULL;
 		dev_warn(&dev->pdev->dev,
 			"Could not allocate space for cursors. Not doing hardware cursors.\n");
 	} else {
 		mdev->cursor.pixels_current = mdev->cursor.pixels_1;
 		mdev->cursor.pixels_prev = mdev->cursor.pixels_2;
 	}

 	return 0;

 err_modeset:
 	drm_mode_config_cleanup(dev);
 	mgag200_mm_fini(mdev);
 err_mm:
 	dev->dev_private = NULL;

 	return r;
 }

 int mgag200_driver_unload(struct drm_device *dev)
 {
 	struct mga_device *mdev = dev->dev_private;

 	if (mdev == NULL)
 		return 0;
 	mgag200_modeset_fini(mdev);
 	mgag200_fbdev_fini(mdev);
 	drm_mode_config_cleanup(dev);
 	mgag200_mm_fini(mdev);
 	dev->dev_private = NULL;
 	return 0;
 }

 int mgag200_gem_create(struct drm_device *dev,
 		   u32 size, bool iskernel,
 		   struct drm_gem_object **obj)
 {
 	struct mgag200_bo *astbo;
 	int ret;

 	*obj = NULL;

 	size = roundup(size, PAGE_SIZE);
 	if (size == 0)
 		return -EINVAL;

 	ret = mgag200_bo_create(dev, size, 0, 0, &astbo);
 	if (ret) {
 		if (ret != -ERESTARTSYS)
 			DRM_ERROR("failed to allocate GEM object\n");
 		return ret;
 	}
 	*obj = &astbo->gem;
 	return 0;
 }

 int mgag200_dumb_create(struct drm_file *file,
 		    struct drm_device *dev,
 		    struct drm_mode_create_dumb *args)
 {
 	int ret;
 	struct drm_gem_object *gobj;
 	u32 handle;

 	args->pitch = args->width * ((args->bpp + 7) / 8);
 	args->size = args->pitch * args->height;

 	ret = mgag200_gem_create(dev, args->size, false,
 			     &gobj);
 	if (ret)
 		return ret;

 	ret = drm_gem_handle_create(file, gobj, &handle);
 	drm_gem_object_unreference_unlocked(gobj);
 	if (ret)
 		return ret;

 	args->handle = handle;
 	return 0;
 }

 static void mgag200_bo_unref(struct mgag200_bo **bo)
 {
 	struct ttm_buffer_object *tbo;

 	if ((*bo) == NULL)
 		return;

 	tbo = &((*bo)->bo);
 	ttm_bo_unref(&tbo);
 	*bo = NULL;
 }

 void mgag200_gem_free_object(struct drm_gem_object *obj)
 {
 	struct mgag200_bo *mgag200_bo = gem_to_mga_bo(obj);

 	mgag200_bo_unref(&mgag200_bo);
 }


 static inline u64 mgag200_bo_mmap_offset(struct mgag200_bo *bo)
 {
 	return drm_vma_node_offset_addr(&bo->bo.vma_node);
 }

 int
 mgag200_dumb_mmap_offset(struct drm_file *file,
 		     struct drm_device *dev,
 		     uint32_t handle,
 		     uint64_t *offset)
 {
 	struct drm_gem_object *obj;
 	struct mgag200_bo *bo;

 	obj = drm_gem_object_lookup(file, handle);
 	if (obj == NULL)
 		return -ENOENT;

 	bo = gem_to_mga_bo(obj);
 	*offset = mgag200_bo_mmap_offset(bo);

 	drm_gem_object_unreference_unlocked(obj);
 	return 0;
 }
	/*
	* Copyright 2010 Matt Turner.
	* Copyright 2012 Red Hat
	*
	* This file is subject to the terms and conditions of the GNU General
	* Public License version 2. See the file COPYING in the main
	* directory of this archive for more details.
	*
	* Authors: Matthew Garrett
	* Matt Turner
	* Dave Airlie
	*/
	#include <drm/drmP.h>
	#include <drm/drm_crtc_helper.h>
	#include "mgag200_drv.h"

	static void mga_user_framebuffer_destroy(struct drm_framebuffer *fb)
	{
	struct mga_framebuffer *mga_fb = to_mga_framebuffer(fb);
	if (mga_fb->obj)
	drm_gem_object_unreference_unlocked(mga_fb->obj);
	drm_framebuffer_cleanup(fb);
	kfree(fb);
	}

	static const struct drm_framebuffer_funcs mga_fb_funcs = {
	.destroy = mga_user_framebuffer_destroy,
	};

	int mgag200_framebuffer_init(struct drm_device *dev,
	struct mga_framebuffer *gfb,
	const struct drm_mode_fb_cmd2 *mode_cmd,
	struct drm_gem_object *obj)
	{
	int ret;

	drm_helper_mode_fill_fb_struct(&gfb->base, mode_cmd);
	gfb->obj = obj;
	ret = drm_framebuffer_init(dev, &gfb->base, &mga_fb_funcs);
	if (ret) {
	DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
	return ret;
	}
	return 0;
	}

	static struct drm_framebuffer *
	mgag200_user_framebuffer_create(struct drm_device *dev,
	struct drm_file *filp,
	const struct drm_mode_fb_cmd2 *mode_cmd)
	{
	struct drm_gem_object *obj;
	struct mga_framebuffer *mga_fb;
	int ret;

	obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
	if (obj == NULL)
	return ERR_PTR(-ENOENT);

	mga_fb = kzalloc(sizeof(*mga_fb), GFP_KERNEL);
	if (!mga_fb) {
	drm_gem_object_unreference_unlocked(obj);
	return ERR_PTR(-ENOMEM);
	}

	ret = mgag200_framebuffer_init(dev, mga_fb, mode_cmd, obj);
	if (ret) {
	drm_gem_object_unreference_unlocked(obj);
	kfree(mga_fb);
	return ERR_PTR(ret);
	}
	return &mga_fb->base;
	}

	static const struct drm_mode_config_funcs mga_mode_funcs = {
	.fb_create = mgag200_user_framebuffer_create,
	};

	static int mga_probe_vram(struct mga_device mdev, void __iomem mem)
	{
	int offset;
	int orig;
	int test1, test2;
	int orig1, orig2;
	unsigned int vram_size;

	/* Probe */
	orig = ioread16(mem);
	iowrite16(0, mem);

	vram_size = mdev->mc.vram_window;

	if ((mdev->type == G200_EW3) && (vram_size >= 0x1000000)) {
	vram_size = vram_size - 0x400000;
	}

	for (offset = 0x100000; offset < vram_size; offset += 0x4000) {
	orig1 = ioread8(mem + offset);
	orig2 = ioread8(mem + offset + 0x100);

	iowrite16(0xaa55, mem + offset);
	iowrite16(0xaa55, mem + offset + 0x100);

	test1 = ioread16(mem + offset);
	test2 = ioread16(mem);

	iowrite16(orig1, mem + offset);
	iowrite16(orig2, mem + offset + 0x100);

	if (test1 != 0xaa55) {
	break;
	}

	if (test2) {
	break;
	}
	}

	iowrite16(orig, mem);
	return offset - 65536;
	}

	/* Map the framebuffer from the card and configure the core */
	static int mga_vram_init(struct mga_device *mdev)
	{
	void __iomem *mem;
	struct apertures_struct *aper = alloc_apertures(1);
	if (!aper)
	return -ENOMEM;

	/* BAR 0 is VRAM */
	mdev->mc.vram_base = pci_resource_start(mdev->dev->pdev, 0);
	mdev->mc.vram_window = pci_resource_len(mdev->dev->pdev, 0);

	aper->ranges[0].base = mdev->mc.vram_base;
	aper->ranges[0].size = mdev->mc.vram_window;

	remove_conflicting_framebuffers(aper, "mgafb", true);
	kfree(aper);

	if (!devm_request_mem_region(mdev->dev->dev, mdev->mc.vram_base, mdev->mc.vram_window,
	"mgadrmfb_vram")) {
	DRM_ERROR("can't reserve VRAM\n");
	return -ENXIO;
	}

	mem = pci_iomap(mdev->dev->pdev, 0, 0);

	mdev->mc.vram_size = mga_probe_vram(mdev, mem);

	pci_iounmap(mdev->dev->pdev, mem);

	return 0;
	}

	static int mgag200_device_init(struct drm_device *dev,
	uint32_t flags)
	{
	struct mga_device *mdev = dev->dev_private;
	int ret, option;

	mdev->type = flags;

	/* Hardcode the number of CRTCs to 1 */
	mdev->num_crtc = 1;

	pci_read_config_dword(dev->pdev, PCI_MGA_OPTION, &option);
	mdev->has_sdram = !(option & (1 << 14));

	/* BAR 0 is the framebuffer, BAR 1 contains registers */
	mdev->rmmio_base = pci_resource_start(mdev->dev->pdev, 1);
	mdev->rmmio_size = pci_resource_len(mdev->dev->pdev, 1);

	if (!devm_request_mem_region(mdev->dev->dev, mdev->rmmio_base, mdev->rmmio_size,
	"mgadrmfb_mmio")) {
	DRM_ERROR("can't reserve mmio registers\n");
	return -ENOMEM;
	}

	mdev->rmmio = pcim_iomap(dev->pdev, 1, 0);
	if (mdev->rmmio == NULL)
	return -ENOMEM;

	/* stash G200 SE model number for later use */
	if (IS_G200_SE(mdev))
	mdev->unique_rev_id = RREG32(0x1e24);

	ret = mga_vram_init(mdev);
	if (ret)
	return ret;

	mdev->bpp_shifts[0] = 0;
	mdev->bpp_shifts[1] = 1;
	mdev->bpp_shifts[2] = 0;
	mdev->bpp_shifts[3] = 2;
	return 0;
	}

	/*
	* Functions here will be called by the core once it's bound the driver to
	* a PCI device
	*/


	int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
	{
	struct mga_device *mdev;
	int r;

	mdev = devm_kzalloc(dev->dev, sizeof(struct mga_device), GFP_KERNEL);
	if (mdev == NULL)
	return -ENOMEM;
	dev->dev_private = (void *)mdev;
	mdev->dev = dev;

	r = mgag200_device_init(dev, flags);
	if (r) {
	dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
	return r;
	}
	r = mgag200_mm_init(mdev);
	if (r)
	goto err_mm;

	drm_mode_config_init(dev);
	dev->mode_config.funcs = (void *)&mga_mode_funcs;
	if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
	dev->mode_config.preferred_depth = 16;
	else
	dev->mode_config.preferred_depth = 24;
	dev->mode_config.prefer_shadow = 1;

	r = mgag200_modeset_init(mdev);
	if (r) {
	dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
	goto err_modeset;
	}

	/* Make small buffers to store a hardware cursor (double buffered icon updates) */
	mgag200_bo_create(dev, roundup(48*64, PAGE_SIZE), 0, 0,
	&mdev->cursor.pixels_1);
	mgag200_bo_create(dev, roundup(48*64, PAGE_SIZE), 0, 0,
	&mdev->cursor.pixels_2);
	if (!mdev->cursor.pixels_2 \|\| !mdev->cursor.pixels_1) {
	mdev->cursor.pixels_1 = NULL;
	mdev->cursor.pixels_2 = NULL;
	dev_warn(&dev->pdev->dev,
	"Could not allocate space for cursors. Not doing hardware cursors.\n");
	} else {
	mdev->cursor.pixels_current = mdev->cursor.pixels_1;
	mdev->cursor.pixels_prev = mdev->cursor.pixels_2;
	}

	return 0;

	err_modeset:
	drm_mode_config_cleanup(dev);
	mgag200_mm_fini(mdev);
	err_mm:
	dev->dev_private = NULL;

	return r;
	}

	int mgag200_driver_unload(struct drm_device *dev)
	{
	struct mga_device *mdev = dev->dev_private;

	if (mdev == NULL)
	return 0;
	mgag200_modeset_fini(mdev);
	mgag200_fbdev_fini(mdev);
	drm_mode_config_cleanup(dev);
	mgag200_mm_fini(mdev);
	dev->dev_private = NULL;
	return 0;
	}

	int mgag200_gem_create(struct drm_device *dev,
	u32 size, bool iskernel,
	struct drm_gem_object **obj)
	{
	struct mgag200_bo *astbo;
	int ret;

	*obj = NULL;

	size = roundup(size, PAGE_SIZE);
	if (size == 0)
	return -EINVAL;

	ret = mgag200_bo_create(dev, size, 0, 0, &astbo);
	if (ret) {
	if (ret != -ERESTARTSYS)
	DRM_ERROR("failed to allocate GEM object\n");
	return ret;
	}
	*obj = &astbo->gem;
	return 0;
	}

	int mgag200_dumb_create(struct drm_file *file,
	struct drm_device *dev,
	struct drm_mode_create_dumb *args)
	{
	int ret;
	struct drm_gem_object *gobj;
	u32 handle;

	args->pitch = args->width * ((args->bpp + 7) / 8);
	args->size = args->pitch * args->height;

	ret = mgag200_gem_create(dev, args->size, false,
	&gobj);
	if (ret)
	return ret;

	ret = drm_gem_handle_create(file, gobj, &handle);
	drm_gem_object_unreference_unlocked(gobj);
	if (ret)
	return ret;

	args->handle = handle;
	return 0;
	}

	static void mgag200_bo_unref(struct mgag200_bo **bo)
	{
	struct ttm_buffer_object *tbo;

	if ((*bo) == NULL)
	return;

	tbo = &((*bo)->bo);
	ttm_bo_unref(&tbo);
	*bo = NULL;
	}

	void mgag200_gem_free_object(struct drm_gem_object *obj)
	{
	struct mgag200_bo *mgag200_bo = gem_to_mga_bo(obj);

	mgag200_bo_unref(&mgag200_bo);
	}


	static inline u64 mgag200_bo_mmap_offset(struct mgag200_bo *bo)
	{
	return drm_vma_node_offset_addr(&bo->bo.vma_node);
	}

	int
	mgag200_dumb_mmap_offset(struct drm_file *file,
	struct drm_device *dev,
	uint32_t handle,
	uint64_t *offset)
	{
	struct drm_gem_object *obj;
	struct mgag200_bo *bo;

	obj = drm_gem_object_lookup(file, handle);
	if (obj == NULL)
	return -ENOENT;

	bo = gem_to_mga_bo(obj);
	*offset = mgag200_bo_mmap_offset(bo);

	drm_gem_object_unreference_unlocked(obj);
	return 0;
	}