summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/tegra/fbdev.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/gpu/drm/tegra/fbdev.c')
-rw-r--r--drivers/gpu/drm/tegra/fbdev.c236
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);
+}