diff options
Diffstat (limited to 'drivers/gpu/drm/tegra/fbdev.c')
| -rw-r--r-- | drivers/gpu/drm/tegra/fbdev.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tegra/fbdev.c b/drivers/gpu/drm/tegra/fbdev.c new file mode 100644 index 0000000000..db6eaac3d3 --- /dev/null +++ b/drivers/gpu/drm/tegra/fbdev.c @@ -0,0 +1,236 @@ +// 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_DMAMEM_OPS_RDWR, + DRM_FB_HELPER_DEFAULT_OPS, + __FB_DEFAULT_DMAMEM_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->flags |= FBINFO_VIRTFB; + info->screen_buffer = 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); +} |