drivers/gpu/drm/gma500/fbdev.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /**************************************************************************
  * Copyright (c) 2007-2011, Intel Corporation.
  * All Rights Reserved.
  *
  **************************************************************************/

 #include <linux/pfn_t.h>

 #include <drm/drm_crtc_helper.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_fb_helper.h>
 #include <drm/drm_framebuffer.h>

 #include "gem.h"
 #include "psb_drv.h"

 /*
  * VM area struct
  */

 static vm_fault_t psb_fbdev_vm_fault(struct vm_fault *vmf)
 {
 	struct vm_area_struct *vma = vmf->vma;
 	struct fb_info *info = vma->vm_private_data;
 	unsigned long address = vmf->address - (vmf->pgoff << PAGE_SHIFT);
 	unsigned long pfn = info->fix.smem_start >> PAGE_SHIFT;
 	vm_fault_t err = VM_FAULT_SIGBUS;
 	unsigned long page_num = vma_pages(vma);
 	unsigned long i;

 	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

 	for (i = 0; i < page_num; ++i) {
 		err = vmf_insert_mixed(vma, address, __pfn_to_pfn_t(pfn, PFN_DEV));
 		if (unlikely(err & VM_FAULT_ERROR))
 			break;
 		address += PAGE_SIZE;
 		++pfn;
 	}

 	return err;
 }

 static const struct vm_operations_struct psb_fbdev_vm_ops = {
 	.fault	= psb_fbdev_vm_fault,
 };

 /*
  * struct fb_ops
  */

 #define CMAP_TOHW(_val, _width) ((((_val) << (_width)) + 0x7FFF - (_val)) >> 16)

 static int psb_fbdev_fb_setcolreg(unsigned int regno,
 				  unsigned int red, unsigned int green,
 				  unsigned int blue, unsigned int transp,
 				  struct fb_info *info)
 {
 	struct drm_fb_helper *fb_helper = info->par;
 	struct drm_framebuffer *fb = fb_helper->fb;
 	uint32_t v;

 	if (!fb)
 		return -ENOMEM;

 	if (regno > 255)
 		return 1;

 	red = CMAP_TOHW(red, info->var.red.length);
 	blue = CMAP_TOHW(blue, info->var.blue.length);
 	green = CMAP_TOHW(green, info->var.green.length);
 	transp = CMAP_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);

 	if (regno < 16) {
 		switch (fb->format->cpp[0] * 8) {
 		case 16:
 			((uint32_t *) info->pseudo_palette)[regno] = v;
 			break;
 		case 24:
 		case 32:
 			((uint32_t *) info->pseudo_palette)[regno] = v;
 			break;
 		}
 	}

 	return 0;
 }

 static int psb_fbdev_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 {
 	if (vma->vm_pgoff != 0)
 		return -EINVAL;
 	if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
 		return -EINVAL;

 	/*
 	 * If this is a GEM object then info->screen_base is the virtual
 	 * kernel remapping of the object. FIXME: Review if this is
 	 * suitable for our mmap work
 	 */
 	vma->vm_ops = &psb_fbdev_vm_ops;
 	vma->vm_private_data = info;
 	vm_flags_set(vma, VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP);

 	return 0;
 }

 static void psb_fbdev_fb_destroy(struct fb_info *info)
 {
 	struct drm_fb_helper *fb_helper = info->par;
 	struct drm_framebuffer *fb = fb_helper->fb;
 	struct drm_gem_object *obj = fb->obj[0];

 	drm_fb_helper_fini(fb_helper);

 	drm_framebuffer_unregister_private(fb);
 	fb->obj[0] = NULL;
 	drm_framebuffer_cleanup(fb);
 	kfree(fb);

 	drm_gem_object_put(obj);

 	drm_client_release(&fb_helper->client);

 	drm_fb_helper_unprepare(fb_helper);
 	kfree(fb_helper);
 }

 static const struct fb_ops psb_fbdev_fb_ops = {
 	.owner = THIS_MODULE,
 	DRM_FB_HELPER_DEFAULT_OPS,
 	.fb_setcolreg = psb_fbdev_fb_setcolreg,
 	.fb_read = drm_fb_helper_cfb_read,
 	.fb_write = drm_fb_helper_cfb_write,
 	.fb_fillrect = drm_fb_helper_cfb_fillrect,
 	.fb_copyarea = drm_fb_helper_cfb_copyarea,
 	.fb_imageblit = drm_fb_helper_cfb_imageblit,
 	.fb_mmap = psb_fbdev_fb_mmap,
 	.fb_destroy = psb_fbdev_fb_destroy,
 };

 /*
  * struct drm_fb_helper_funcs
  */

 static int psb_fbdev_fb_probe(struct drm_fb_helper *fb_helper,
 			      struct drm_fb_helper_surface_size *sizes)
 {
 	struct drm_device *dev = fb_helper->dev;
 	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 	struct pci_dev *pdev = to_pci_dev(dev->dev);
 	struct fb_info *info;
 	struct drm_framebuffer *fb;
 	struct drm_mode_fb_cmd2 mode_cmd = { };
 	int size;
 	int ret;
 	struct psb_gem_object *backing;
 	struct drm_gem_object *obj;
 	u32 bpp, depth;

 	/* No 24-bit packed mode */
 	if (sizes->surface_bpp == 24) {
 		sizes->surface_bpp = 32;
 		sizes->surface_depth = 24;
 	}
 	bpp = sizes->surface_bpp;
 	depth = sizes->surface_depth;

 	/*
 	 * If the mode does not fit in 32 bit then switch to 16 bit to get
 	 * a console on full resolution. The X mode setting server will
 	 * allocate its own 32-bit GEM framebuffer.
 	 */
 	size = ALIGN(sizes->surface_width * DIV_ROUND_UP(bpp, 8), 64) *
 		     sizes->surface_height;
 	size = ALIGN(size, PAGE_SIZE);

 	if (size > dev_priv->vram_stolen_size) {
 		sizes->surface_bpp = 16;
 		sizes->surface_depth = 16;
 	}
 	bpp = sizes->surface_bpp;
 	depth = sizes->surface_depth;

 	mode_cmd.width = sizes->surface_width;
 	mode_cmd.height = sizes->surface_height;
 	mode_cmd.pitches[0] = ALIGN(mode_cmd.width * DIV_ROUND_UP(bpp, 8), 64);
 	mode_cmd.pixel_format = drm_mode_legacy_fb_format(bpp, depth);

 	size = mode_cmd.pitches[0] * mode_cmd.height;
 	size = ALIGN(size, PAGE_SIZE);

 	/* Allocate the framebuffer in the GTT with stolen page backing */
 	backing = psb_gem_create(dev, size, "fb", true, PAGE_SIZE);
 	if (IS_ERR(backing))
 		return PTR_ERR(backing);
 	obj = &backing->base;

 	fb = psb_framebuffer_create(dev, &mode_cmd, obj);
 	if (IS_ERR(fb)) {
 		ret = PTR_ERR(fb);
 		goto err_drm_gem_object_put;
 	}

 	fb_helper->fb = fb;

 	info = drm_fb_helper_alloc_info(fb_helper);
 	if (IS_ERR(info)) {
 		ret = PTR_ERR(info);
 		goto err_drm_framebuffer_unregister_private;
 	}

 	info->fbops = &psb_fbdev_fb_ops;
 	info->flags = FBINFO_DEFAULT;
 	/* Accessed stolen memory directly */
 	info->screen_base = dev_priv->vram_addr + backing->offset;
 	info->screen_size = size;

 	drm_fb_helper_fill_info(info, fb_helper, sizes);

 	info->fix.smem_start = dev_priv->stolen_base + backing->offset;
 	info->fix.smem_len = size;
 	info->fix.ywrapstep = 0;
 	info->fix.ypanstep = 0;
 	info->fix.mmio_start = pci_resource_start(pdev, 0);
 	info->fix.mmio_len = pci_resource_len(pdev, 0);

 	memset(info->screen_base, 0, info->screen_size);

 	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */

 	dev_dbg(dev->dev, "allocated %dx%d fb\n", fb->width, fb->height);

 	return 0;

 err_drm_framebuffer_unregister_private:
 	drm_framebuffer_unregister_private(fb);
 	fb->obj[0] = NULL;
 	drm_framebuffer_cleanup(fb);
 	kfree(fb);
 err_drm_gem_object_put:
 	drm_gem_object_put(obj);
 	return ret;
 }

 static const struct drm_fb_helper_funcs psb_fbdev_fb_helper_funcs = {
 	.fb_probe = psb_fbdev_fb_probe,
 };

 /*
  * struct drm_client_funcs and setup code
  */

 static void psb_fbdev_client_unregister(struct drm_client_dev *client)
 {
 	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);

 	if (fb_helper->info) {
 		drm_fb_helper_unregister_info(fb_helper);
 	} else {
 		drm_fb_helper_unprepare(fb_helper);
 		drm_client_release(&fb_helper->client);
 		kfree(fb_helper);
 	}
 }

 static int psb_fbdev_client_restore(struct drm_client_dev *client)
 {
 	drm_fb_helper_lastclose(client->dev);

 	return 0;
 }

 static int psb_fbdev_client_hotplug(struct drm_client_dev *client)
 {
 	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
 	struct drm_device *dev = client->dev;
 	int ret;

 	if (dev->fb_helper)
 		return drm_fb_helper_hotplug_event(dev->fb_helper);

 	ret = drm_fb_helper_init(dev, fb_helper);
 	if (ret)
 		goto err_drm_err;

 	if (!drm_drv_uses_atomic_modeset(dev))
 		drm_helper_disable_unused_functions(dev);

 	ret = drm_fb_helper_initial_config(fb_helper);
 	if (ret)
 		goto err_drm_fb_helper_fini;

 	return 0;

 err_drm_fb_helper_fini:
 	drm_fb_helper_fini(fb_helper);
 err_drm_err:
 	drm_err(dev, "Failed to setup gma500 fbdev emulation (ret=%d)\n", ret);
 	return ret;
 }

 static const struct drm_client_funcs psb_fbdev_client_funcs = {
 	.owner		= THIS_MODULE,
 	.unregister	= psb_fbdev_client_unregister,
 	.restore	= psb_fbdev_client_restore,
 	.hotplug	= psb_fbdev_client_hotplug,
 };

 void psb_fbdev_setup(struct drm_psb_private *dev_priv)
 {
 	struct drm_device *dev = &dev_priv->dev;
 	struct drm_fb_helper *fb_helper;
 	int ret;

 	fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
 	if (!fb_helper)
 		return;
 	drm_fb_helper_prepare(dev, fb_helper, 32, &psb_fbdev_fb_helper_funcs);

 	ret = drm_client_init(dev, &fb_helper->client, "fbdev-gma500", &psb_fbdev_client_funcs);
 	if (ret) {
 		drm_err(dev, "Failed to register client: %d\n", ret);
 		goto err_drm_fb_helper_unprepare;
 	}

 	ret = psb_fbdev_client_hotplug(&fb_helper->client);
 	if (ret)
 		drm_dbg_kms(dev, "client hotplug ret=%d\n", ret);

 	drm_client_register(&fb_helper->client);

 	return;

 err_drm_fb_helper_unprepare:
 	drm_fb_helper_unprepare(fb_helper);
 	kfree(fb_helper);
 }
	// SPDX-License-Identifier: GPL-2.0-only
	/**************************************************************************
	* Copyright (c) 2007-2011, Intel Corporation.
	* All Rights Reserved.
	*
	**************************************************************************/

	#include <linux/pfn_t.h>

	#include <drm/drm_crtc_helper.h>
	#include <drm/drm_drv.h>
	#include <drm/drm_fb_helper.h>
	#include <drm/drm_framebuffer.h>

	#include "gem.h"
	#include "psb_drv.h"

	/*
	* VM area struct
	*/

	static vm_fault_t psb_fbdev_vm_fault(struct vm_fault *vmf)
	{
	struct vm_area_struct *vma = vmf->vma;
	struct fb_info *info = vma->vm_private_data;
	unsigned long address = vmf->address - (vmf->pgoff << PAGE_SHIFT);
	unsigned long pfn = info->fix.smem_start >> PAGE_SHIFT;
	vm_fault_t err = VM_FAULT_SIGBUS;
	unsigned long page_num = vma_pages(vma);
	unsigned long i;

	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

	for (i = 0; i < page_num; ++i) {
	err = vmf_insert_mixed(vma, address, __pfn_to_pfn_t(pfn, PFN_DEV));
	if (unlikely(err & VM_FAULT_ERROR))
	break;
	address += PAGE_SIZE;
	++pfn;
	}

	return err;
	}

	static const struct vm_operations_struct psb_fbdev_vm_ops = {
	.fault = psb_fbdev_vm_fault,
	};

	/*
	* struct fb_ops
	*/

	#define CMAP_TOHW(_val, _width) ((((_val) << (_width)) + 0x7FFF - (_val)) >> 16)

	static int psb_fbdev_fb_setcolreg(unsigned int regno,
	unsigned int red, unsigned int green,
	unsigned int blue, unsigned int transp,
	struct fb_info *info)
	{
	struct drm_fb_helper *fb_helper = info->par;
	struct drm_framebuffer *fb = fb_helper->fb;
	uint32_t v;

	if (!fb)
	return -ENOMEM;

	if (regno > 255)
	return 1;

	red = CMAP_TOHW(red, info->var.red.length);
	blue = CMAP_TOHW(blue, info->var.blue.length);
	green = CMAP_TOHW(green, info->var.green.length);
	transp = CMAP_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);

	if (regno < 16) {
	switch (fb->format->cpp[0] * 8) {
	case 16:
	((uint32_t *) info->pseudo_palette)[regno] = v;
	break;
	case 24:
	case 32:
	((uint32_t *) info->pseudo_palette)[regno] = v;
	break;
	}
	}

	return 0;
	}

	static int psb_fbdev_fb_mmap(struct fb_info info, struct vm_area_struct vma)
	{
	if (vma->vm_pgoff != 0)
	return -EINVAL;
	if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
	return -EINVAL;

	/*
	* If this is a GEM object then info->screen_base is the virtual
	* kernel remapping of the object. FIXME: Review if this is
	* suitable for our mmap work
	*/
	vma->vm_ops = &psb_fbdev_vm_ops;
	vma->vm_private_data = info;
	vm_flags_set(vma, VM_IO \| VM_MIXEDMAP \| VM_DONTEXPAND \| VM_DONTDUMP);

	return 0;
	}

	static void psb_fbdev_fb_destroy(struct fb_info *info)
	{
	struct drm_fb_helper *fb_helper = info->par;
	struct drm_framebuffer *fb = fb_helper->fb;
	struct drm_gem_object *obj = fb->obj[0];

	drm_fb_helper_fini(fb_helper);

	drm_framebuffer_unregister_private(fb);
	fb->obj[0] = NULL;
	drm_framebuffer_cleanup(fb);
	kfree(fb);

	drm_gem_object_put(obj);

	drm_client_release(&fb_helper->client);

	drm_fb_helper_unprepare(fb_helper);
	kfree(fb_helper);
	}

	static const struct fb_ops psb_fbdev_fb_ops = {
	.owner = THIS_MODULE,
	DRM_FB_HELPER_DEFAULT_OPS,
	.fb_setcolreg = psb_fbdev_fb_setcolreg,
	.fb_read = drm_fb_helper_cfb_read,
	.fb_write = drm_fb_helper_cfb_write,
	.fb_fillrect = drm_fb_helper_cfb_fillrect,
	.fb_copyarea = drm_fb_helper_cfb_copyarea,
	.fb_imageblit = drm_fb_helper_cfb_imageblit,
	.fb_mmap = psb_fbdev_fb_mmap,
	.fb_destroy = psb_fbdev_fb_destroy,
	};

	/*
	* struct drm_fb_helper_funcs
	*/

	static int psb_fbdev_fb_probe(struct drm_fb_helper *fb_helper,
	struct drm_fb_helper_surface_size *sizes)
	{
	struct drm_device *dev = fb_helper->dev;
	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
	struct pci_dev *pdev = to_pci_dev(dev->dev);
	struct fb_info *info;
	struct drm_framebuffer *fb;
	struct drm_mode_fb_cmd2 mode_cmd = { };
	int size;
	int ret;
	struct psb_gem_object *backing;
	struct drm_gem_object *obj;
	u32 bpp, depth;

	/* No 24-bit packed mode */
	if (sizes->surface_bpp == 24) {
	sizes->surface_bpp = 32;
	sizes->surface_depth = 24;
	}
	bpp = sizes->surface_bpp;
	depth = sizes->surface_depth;

	/*
	* If the mode does not fit in 32 bit then switch to 16 bit to get
	* a console on full resolution. The X mode setting server will
	* allocate its own 32-bit GEM framebuffer.
	*/
	size = ALIGN(sizes->surface_width * DIV_ROUND_UP(bpp, 8), 64) *
	sizes->surface_height;
	size = ALIGN(size, PAGE_SIZE);

	if (size > dev_priv->vram_stolen_size) {
	sizes->surface_bpp = 16;
	sizes->surface_depth = 16;
	}
	bpp = sizes->surface_bpp;
	depth = sizes->surface_depth;

	mode_cmd.width = sizes->surface_width;
	mode_cmd.height = sizes->surface_height;
	mode_cmd.pitches[0] = ALIGN(mode_cmd.width * DIV_ROUND_UP(bpp, 8), 64);
	mode_cmd.pixel_format = drm_mode_legacy_fb_format(bpp, depth);

	size = mode_cmd.pitches[0] * mode_cmd.height;
	size = ALIGN(size, PAGE_SIZE);

	/* Allocate the framebuffer in the GTT with stolen page backing */
	backing = psb_gem_create(dev, size, "fb", true, PAGE_SIZE);
	if (IS_ERR(backing))
	return PTR_ERR(backing);
	obj = &backing->base;

	fb = psb_framebuffer_create(dev, &mode_cmd, obj);
	if (IS_ERR(fb)) {
	ret = PTR_ERR(fb);
	goto err_drm_gem_object_put;
	}

	fb_helper->fb = fb;

	info = drm_fb_helper_alloc_info(fb_helper);
	if (IS_ERR(info)) {
	ret = PTR_ERR(info);
	goto err_drm_framebuffer_unregister_private;
	}

	info->fbops = &psb_fbdev_fb_ops;
	info->flags = FBINFO_DEFAULT;
	/* Accessed stolen memory directly */
	info->screen_base = dev_priv->vram_addr + backing->offset;
	info->screen_size = size;

	drm_fb_helper_fill_info(info, fb_helper, sizes);

	info->fix.smem_start = dev_priv->stolen_base + backing->offset;
	info->fix.smem_len = size;
	info->fix.ywrapstep = 0;
	info->fix.ypanstep = 0;
	info->fix.mmio_start = pci_resource_start(pdev, 0);
	info->fix.mmio_len = pci_resource_len(pdev, 0);

	memset(info->screen_base, 0, info->screen_size);

	/* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */

	dev_dbg(dev->dev, "allocated %dx%d fb\n", fb->width, fb->height);

	return 0;

	err_drm_framebuffer_unregister_private:
	drm_framebuffer_unregister_private(fb);
	fb->obj[0] = NULL;
	drm_framebuffer_cleanup(fb);
	kfree(fb);
	err_drm_gem_object_put:
	drm_gem_object_put(obj);
	return ret;
	}

	static const struct drm_fb_helper_funcs psb_fbdev_fb_helper_funcs = {
	.fb_probe = psb_fbdev_fb_probe,
	};

	/*
	* struct drm_client_funcs and setup code
	*/

	static void psb_fbdev_client_unregister(struct drm_client_dev *client)
	{
	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);

	if (fb_helper->info) {
	drm_fb_helper_unregister_info(fb_helper);
	} else {
	drm_fb_helper_unprepare(fb_helper);
	drm_client_release(&fb_helper->client);
	kfree(fb_helper);
	}
	}

	static int psb_fbdev_client_restore(struct drm_client_dev *client)
	{
	drm_fb_helper_lastclose(client->dev);

	return 0;
	}

	static int psb_fbdev_client_hotplug(struct drm_client_dev *client)
	{
	struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
	struct drm_device *dev = client->dev;
	int ret;

	if (dev->fb_helper)
	return drm_fb_helper_hotplug_event(dev->fb_helper);

	ret = drm_fb_helper_init(dev, fb_helper);
	if (ret)
	goto err_drm_err;

	if (!drm_drv_uses_atomic_modeset(dev))
	drm_helper_disable_unused_functions(dev);

	ret = drm_fb_helper_initial_config(fb_helper);
	if (ret)
	goto err_drm_fb_helper_fini;

	return 0;

	err_drm_fb_helper_fini:
	drm_fb_helper_fini(fb_helper);
	err_drm_err:
	drm_err(dev, "Failed to setup gma500 fbdev emulation (ret=%d)\n", ret);
	return ret;
	}

	static const struct drm_client_funcs psb_fbdev_client_funcs = {
	.owner = THIS_MODULE,
	.unregister = psb_fbdev_client_unregister,
	.restore = psb_fbdev_client_restore,
	.hotplug = psb_fbdev_client_hotplug,
	};

	void psb_fbdev_setup(struct drm_psb_private *dev_priv)
	{
	struct drm_device *dev = &dev_priv->dev;
	struct drm_fb_helper *fb_helper;
	int ret;

	fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
	if (!fb_helper)
	return;
	drm_fb_helper_prepare(dev, fb_helper, 32, &psb_fbdev_fb_helper_funcs);

	ret = drm_client_init(dev, &fb_helper->client, "fbdev-gma500", &psb_fbdev_client_funcs);
	if (ret) {
	drm_err(dev, "Failed to register client: %d\n", ret);
	goto err_drm_fb_helper_unprepare;
	}

	ret = psb_fbdev_client_hotplug(&fb_helper->client);
	if (ret)
	drm_dbg_kms(dev, "client hotplug ret=%d\n", ret);

	drm_client_register(&fb_helper->client);

	return;

	err_drm_fb_helper_unprepare:
	drm_fb_helper_unprepare(fb_helper);
	kfree(fb_helper);
	}