1 files changed, 204 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/msm_fbdev.c b/drivers/gpu/drm/msm/msm_fbdev.c
new file mode 100644
index 000000000..d4a9b501e
--- /dev/null
+++ b/drivers/gpu/drm/msm/msm_fbdev.c
@@ -0,0 +1,204 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2013 Red Hat
+ * Author: Rob Clark <robdclark@gmail.com>
+ */
+
+#include <drm/drm_aperture.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_framebuffer.h>
+#include <drm/drm_prime.h>
+
+#include "msm_drv.h"
+#include "msm_gem.h"
+#include "msm_kms.h"
+
+static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma);
+
+/*
+ * fbdev funcs, to implement legacy fbdev interface on top of drm driver
+ */
+
+#define to_msm_fbdev(x) container_of(x, struct msm_fbdev, base)
+
+struct msm_fbdev {
+	struct drm_fb_helper base;
+	struct drm_framebuffer *fb;
+};
+
+static const struct fb_ops msm_fb_ops = {
+	.owner = THIS_MODULE,
+	DRM_FB_HELPER_DEFAULT_OPS,
+
+	/* Note: to properly handle manual update displays, we wrap the
+	 * basic fbdev ops which write to the framebuffer
+	 */
+	.fb_read = drm_fb_helper_sys_read,
+	.fb_write = drm_fb_helper_sys_write,
+	.fb_fillrect = drm_fb_helper_sys_fillrect,
+	.fb_copyarea = drm_fb_helper_sys_copyarea,
+	.fb_imageblit = drm_fb_helper_sys_imageblit,
+	.fb_mmap = msm_fbdev_mmap,
+};
+
+static int msm_fbdev_mmap(struct fb_info *info, struct vm_area_struct *vma)
+{
+	struct drm_fb_helper *helper = (struct drm_fb_helper *)info->par;
+	struct msm_fbdev *fbdev = to_msm_fbdev(helper);
+	struct drm_gem_object *bo = msm_framebuffer_bo(fbdev->fb, 0);
+
+	return drm_gem_prime_mmap(bo, vma);
+}
+
+static int msm_fbdev_create(struct drm_fb_helper *helper,
+		struct drm_fb_helper_surface_size *sizes)
+{
+	struct msm_fbdev *fbdev = to_msm_fbdev(helper);
+	struct drm_device *dev = helper->dev;
+	struct msm_drm_private *priv = dev->dev_private;
+	struct drm_framebuffer *fb = NULL;
+	struct drm_gem_object *bo;
+	struct fb_info *fbi = NULL;
+	uint64_t paddr;
+	uint32_t format;
+	int ret, pitch;
+
+	format = drm_mode_legacy_fb_format(sizes->surface_bpp, sizes->surface_depth);
+
+	DBG("create fbdev: %dx%d@%d (%dx%d)", sizes->surface_width,
+			sizes->surface_height, sizes->surface_bpp,
+			sizes->fb_width, sizes->fb_height);
+
+	pitch = align_pitch(sizes->surface_width, sizes->surface_bpp);
+	fb = msm_alloc_stolen_fb(dev, sizes->surface_width,
+			sizes->surface_height, pitch, format);
+
+	if (IS_ERR(fb)) {
+		DRM_DEV_ERROR(dev->dev, "failed to allocate fb\n");
+		return PTR_ERR(fb);
+	}
+
+	bo = msm_framebuffer_bo(fb, 0);
+
+	/*
+	 * NOTE: if we can be guaranteed to be able to map buffer
+	 * in panic (ie. lock-safe, etc) we could avoid pinning the
+	 * buffer now:
+	 */
+	ret = msm_gem_get_and_pin_iova(bo, priv->kms->aspace, &paddr);
+	if (ret) {
+		DRM_DEV_ERROR(dev->dev, "failed to get buffer obj iova: %d\n", ret);
+		goto fail;
+	}
+
+	fbi = drm_fb_helper_alloc_fbi(helper);
+	if (IS_ERR(fbi)) {
+		DRM_DEV_ERROR(dev->dev, "failed to allocate fb info\n");
+		ret = PTR_ERR(fbi);
+		goto fail;
+	}
+
+	DBG("fbi=%p, dev=%p", fbi, dev);
+
+	fbdev->fb = fb;
+	helper->fb = fb;
+
+	fbi->fbops = &msm_fb_ops;
+
+	drm_fb_helper_fill_info(fbi, helper, sizes);
+
+	dev->mode_config.fb_base = paddr;
+
+	fbi->screen_base = msm_gem_get_vaddr(bo);
+	if (IS_ERR(fbi->screen_base)) {
+		ret = PTR_ERR(fbi->screen_base);
+		goto fail;
+	}
+	fbi->screen_size = bo->size;
+	fbi->fix.smem_start = paddr;
+	fbi->fix.smem_len = bo->size;
+
+	DBG("par=%p, %dx%d", fbi->par, fbi->var.xres, fbi->var.yres);
+	DBG("allocated %dx%d fb", fbdev->fb->width, fbdev->fb->height);
+
+	return 0;
+
+fail:
+	drm_framebuffer_remove(fb);
+	return ret;
+}
+
+static const struct drm_fb_helper_funcs msm_fb_helper_funcs = {
+	.fb_probe = msm_fbdev_create,
+};
+
+/* initialize fbdev helper */
+struct drm_fb_helper *msm_fbdev_init(struct drm_device *dev)
+{
+	struct msm_drm_private *priv = dev->dev_private;
+	struct msm_fbdev *fbdev = NULL;
+	struct drm_fb_helper *helper;
+	int ret;
+
+	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
+	if (!fbdev)
+		goto fail;
+
+	helper = &fbdev->base;
+
+	drm_fb_helper_prepare(dev, helper, &msm_fb_helper_funcs);
+
+	ret = drm_fb_helper_init(dev, helper);
+	if (ret) {
+		DRM_DEV_ERROR(dev->dev, "could not init fbdev: ret=%d\n", ret);
+		goto fail;
+	}
+
+	/* the fw fb could be anywhere in memory */
+	ret = drm_aperture_remove_framebuffers(dev->driver);
+	if (ret)
+		goto fini;
+
+	ret = drm_fb_helper_initial_config(helper, 32);
+	if (ret)
+		goto fini;
+
+	priv->fbdev = helper;
+
+	return helper;
+
+fini:
+	drm_fb_helper_fini(helper);
+fail:
+	kfree(fbdev);
+	return NULL;
+}
+
+void msm_fbdev_free(struct drm_device *dev)
+{
+	struct msm_drm_private *priv = dev->dev_private;
+	struct drm_fb_helper *helper = priv->fbdev;
+	struct msm_fbdev *fbdev;
+
+	DBG();
+
+	drm_fb_helper_unregister_fbi(helper);
+
+	drm_fb_helper_fini(helper);
+
+	fbdev = to_msm_fbdev(priv->fbdev);
+
+	/* this will free the backing object */
+	if (fbdev->fb) {
+		struct drm_gem_object *bo =
+			msm_framebuffer_bo(fbdev->fb, 0);
+		msm_gem_put_vaddr(bo);
+		drm_framebuffer_remove(fbdev->fb);
+	}
+
+	kfree(fbdev);
+
+	priv->fbdev = NULL;
+}