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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2012-2013 Avionic Design GmbH
* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
*
* Based on the KMS/FB DMA helpers
* Copyright (C) 2012 Analog Devices Inc.
*/
#include <linux/console.h>
#include <linux/fb.h>
#include <linux/vmalloc.h>
#include <drm/drm_drv.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_modeset_helper.h>
#include "drm.h"
#include "gem.h"
static int tegra_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
struct drm_fb_helper *helper = info->par;
struct tegra_bo *bo;
int err;
bo = tegra_fb_get_plane(helper->fb, 0);
err = drm_gem_mmap_obj(&bo->gem, bo->gem.size, vma);
if (err < 0)
return err;
return __tegra_gem_mmap(&bo->gem, vma);
}
static void tegra_fbdev_fb_destroy(struct fb_info *info)
{
struct drm_fb_helper *helper = info->par;
struct drm_framebuffer *fb = helper->fb;
struct tegra_bo *bo = tegra_fb_get_plane(fb, 0);
drm_fb_helper_fini(helper);
/* Undo the special mapping we made in fbdev probe. */
if (bo->pages) {
vunmap(bo->vaddr);
bo->vaddr = NULL;
}
drm_framebuffer_remove(fb);
drm_client_release(&helper->client);
drm_fb_helper_unprepare(helper);
kfree(helper);
}
static const struct fb_ops tegra_fb_ops = {
.owner = THIS_MODULE,
__FB_DEFAULT_DMA_OPS_RDWR,
DRM_FB_HELPER_DEFAULT_OPS,
__FB_DEFAULT_DMA_OPS_DRAW,
.fb_mmap = tegra_fb_mmap,
.fb_destroy = tegra_fbdev_fb_destroy,
};
static int tegra_fbdev_probe(struct drm_fb_helper *helper,
struct drm_fb_helper_surface_size *sizes)
{
struct tegra_drm *tegra = helper->dev->dev_private;
struct drm_device *drm = helper->dev;
struct drm_mode_fb_cmd2 cmd = { 0 };
unsigned int bytes_per_pixel;
struct drm_framebuffer *fb;
unsigned long offset;
struct fb_info *info;
struct tegra_bo *bo;
size_t size;
int err;
bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
cmd.width = sizes->surface_width;
cmd.height = sizes->surface_height;
cmd.pitches[0] = round_up(sizes->surface_width * bytes_per_pixel,
tegra->pitch_align);
cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
sizes->surface_depth);
size = cmd.pitches[0] * cmd.height;
bo = tegra_bo_create(drm, size, 0);
if (IS_ERR(bo))
return PTR_ERR(bo);
info = drm_fb_helper_alloc_info(helper);
if (IS_ERR(info)) {
dev_err(drm->dev, "failed to allocate framebuffer info\n");
drm_gem_object_put(&bo->gem);
return PTR_ERR(info);
}
fb = tegra_fb_alloc(drm, &cmd, &bo, 1);
if (IS_ERR(fb)) {
err = PTR_ERR(fb);
dev_err(drm->dev, "failed to allocate DRM framebuffer: %d\n",
err);
drm_gem_object_put(&bo->gem);
return PTR_ERR(fb);
}
helper->fb = fb;
helper->info = info;
info->fbops = &tegra_fb_ops;
drm_fb_helper_fill_info(info, helper, sizes);
offset = info->var.xoffset * bytes_per_pixel +
info->var.yoffset * fb->pitches[0];
if (bo->pages) {
bo->vaddr = vmap(bo->pages, bo->num_pages, VM_MAP,
pgprot_writecombine(PAGE_KERNEL));
if (!bo->vaddr) {
dev_err(drm->dev, "failed to vmap() framebuffer\n");
err = -ENOMEM;
goto destroy;
}
}
info->screen_base = (void __iomem *)bo->vaddr + offset;
info->screen_size = size;
info->fix.smem_start = (unsigned long)(bo->iova + offset);
info->fix.smem_len = size;
return 0;
destroy:
drm_framebuffer_remove(fb);
return err;
}
static const struct drm_fb_helper_funcs tegra_fb_helper_funcs = {
.fb_probe = tegra_fbdev_probe,
};
/*
* struct drm_client
*/
static void tegra_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_client_release(&fb_helper->client);
drm_fb_helper_unprepare(fb_helper);
kfree(fb_helper);
}
}
static int tegra_fbdev_client_restore(struct drm_client_dev *client)
{
drm_fb_helper_lastclose(client->dev);
return 0;
}
static int tegra_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 fbdev emulation (ret=%d)\n", ret);
return ret;
}
static const struct drm_client_funcs tegra_fbdev_client_funcs = {
.owner = THIS_MODULE,
.unregister = tegra_fbdev_client_unregister,
.restore = tegra_fbdev_client_restore,
.hotplug = tegra_fbdev_client_hotplug,
};
void tegra_fbdev_setup(struct drm_device *dev)
{
struct drm_fb_helper *helper;
int ret;
drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");
helper = kzalloc(sizeof(*helper), GFP_KERNEL);
if (!helper)
return;
drm_fb_helper_prepare(dev, helper, 32, &tegra_fb_helper_funcs);
ret = drm_client_init(dev, &helper->client, "fbdev", &tegra_fbdev_client_funcs);
if (ret)
goto err_drm_client_init;
drm_client_register(&helper->client);
return;
err_drm_client_init:
drm_fb_helper_unprepare(helper);
kfree(helper);
}
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