1 files changed, 318 insertions, 0 deletions
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fbdev.c b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
new file mode 100644
index 00000000..d5586cc7
--- /dev/null
+++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
@@ -0,0 +1,318 @@
+/* exynos_drm_fbdev.c
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ * Authors:
+ *	Inki Dae <inki.dae@samsung.com>
+ *	Joonyoung Shim <jy0922.shim@samsung.com>
+ *	Seung-Woo Kim <sw0312.kim@samsung.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "drmP.h"
+#include "drm_crtc.h"
+#include "drm_fb_helper.h"
+#include "drm_crtc_helper.h"
+
+#include "exynos_drm_drv.h"
+#include "exynos_drm_fb.h"
+#include "exynos_drm_gem.h"
+
+#define MAX_CONNECTOR		4
+#define PREFERRED_BPP		32
+
+#define to_exynos_fbdev(x)	container_of(x, struct exynos_drm_fbdev,\
+				drm_fb_helper)
+
+struct exynos_drm_fbdev {
+	struct drm_fb_helper		drm_fb_helper;
+	struct exynos_drm_gem_obj	*exynos_gem_obj;
+};
+
+static struct fb_ops exynos_drm_fb_ops = {
+	.owner		= THIS_MODULE,
+	.fb_fillrect	= cfb_fillrect,
+	.fb_copyarea	= cfb_copyarea,
+	.fb_imageblit	= cfb_imageblit,
+	.fb_check_var	= drm_fb_helper_check_var,
+	.fb_set_par	= drm_fb_helper_set_par,
+	.fb_blank	= drm_fb_helper_blank,
+	.fb_pan_display	= drm_fb_helper_pan_display,
+	.fb_setcmap	= drm_fb_helper_setcmap,
+};
+
+static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
+				     struct drm_framebuffer *fb)
+{
+	struct fb_info *fbi = helper->fbdev;
+	struct drm_device *dev = helper->dev;
+	struct exynos_drm_gem_buf *buffer;
+	unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
+	unsigned long offset;
+
+	DRM_DEBUG_KMS("%s\n", __FILE__);
+
+	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
+	drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
+
+	/* RGB formats use only one buffer */
+	buffer = exynos_drm_fb_buffer(fb, 0);
+	if (!buffer) {
+		DRM_LOG_KMS("buffer is null.\n");
+		return -EFAULT;
+	}
+
+	offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
+	offset += fbi->var.yoffset * fb->pitches[0];
+
+	dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
+	fbi->screen_base = buffer->kvaddr + offset;
+	fbi->fix.smem_start = (unsigned long)(buffer->dma_addr + offset);
+	fbi->screen_size = size;
+	fbi->fix.smem_len = size;
+
+	return 0;
+}
+
+static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
+				    struct drm_fb_helper_surface_size *sizes)
+{
+	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
+	struct exynos_drm_gem_obj *exynos_gem_obj;
+	struct drm_device *dev = helper->dev;
+	struct fb_info *fbi;
+	struct drm_mode_fb_cmd2 mode_cmd = { 0 };
+	struct platform_device *pdev = dev->platformdev;
+	unsigned long size;
+	int ret;
+
+	DRM_DEBUG_KMS("%s\n", __FILE__);
+
+	DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
+			sizes->surface_width, sizes->surface_height,
+			sizes->surface_bpp);
+
+	mode_cmd.width = sizes->surface_width;
+	mode_cmd.height = sizes->surface_height;
+	mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
+	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
+							  sizes->surface_depth);
+
+	mutex_lock(&dev->struct_mutex);
+
+	fbi = framebuffer_alloc(0, &pdev->dev);
+	if (!fbi) {
+		DRM_ERROR("failed to allocate fb info.\n");
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	size = mode_cmd.pitches[0] * mode_cmd.height;
+
+	/* 0 means to allocate physically continuous memory */
+	exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
+	if (IS_ERR(exynos_gem_obj)) {
+		ret = PTR_ERR(exynos_gem_obj);
+		goto out;
+	}
+
+	exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
+
+	helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
+			&exynos_gem_obj->base);
+	if (IS_ERR_OR_NULL(helper->fb)) {
+		DRM_ERROR("failed to create drm framebuffer.\n");
+		ret = PTR_ERR(helper->fb);
+		goto out;
+	}
+
+	helper->fbdev = fbi;
+
+	fbi->par = helper;
+	fbi->flags = FBINFO_FLAG_DEFAULT;
+	fbi->fbops = &exynos_drm_fb_ops;
+
+	ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
+	if (ret) {
+		DRM_ERROR("failed to allocate cmap.\n");
+		goto out;
+	}
+
+	ret = exynos_drm_fbdev_update(helper, helper->fb);
+	if (ret < 0) {
+		fb_dealloc_cmap(&fbi->cmap);
+		goto out;
+	}
+
+/*
+ * if failed, all resources allocated above would be released by
+ * drm_mode_config_cleanup() when drm_load() had been called prior
+ * to any specific driver such as fimd or hdmi driver.
+ */
+out:
+	mutex_unlock(&dev->struct_mutex);
+	return ret;
+}
+
+static int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
+				   struct drm_fb_helper_surface_size *sizes)
+{
+	int ret = 0;
+
+	DRM_DEBUG_KMS("%s\n", __FILE__);
+
+	/*
+	 * with !helper->fb, it means that this funcion is called first time
+	 * and after that, the helper->fb would be used as clone mode.
+	 */
+	if (!helper->fb) {
+		ret = exynos_drm_fbdev_create(helper, sizes);
+		if (ret < 0) {
+			DRM_ERROR("failed to create fbdev.\n");
+			return ret;
+		}
+
+		/*
+		 * fb_helper expects a value more than 1 if succeed
+		 * because register_framebuffer() should be called.
+		 */
+		ret = 1;
+	}
+
+	return ret;
+}
+
+static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
+	.fb_probe =	exynos_drm_fbdev_probe,
+};
+
+int exynos_drm_fbdev_init(struct drm_device *dev)
+{
+	struct exynos_drm_fbdev *fbdev;
+	struct exynos_drm_private *private = dev->dev_private;
+	struct drm_fb_helper *helper;
+	unsigned int num_crtc;
+	int ret;
+
+	DRM_DEBUG_KMS("%s\n", __FILE__);
+
+	if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
+		return 0;
+
+	fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
+	if (!fbdev) {
+		DRM_ERROR("failed to allocate drm fbdev.\n");
+		return -ENOMEM;
+	}
+
+	private->fb_helper = helper = &fbdev->drm_fb_helper;
+	helper->funcs = &exynos_drm_fb_helper_funcs;
+
+	num_crtc = dev->mode_config.num_crtc;
+
+	ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
+	if (ret < 0) {
+		DRM_ERROR("failed to initialize drm fb helper.\n");
+		goto err_init;
+	}
+
+	ret = drm_fb_helper_single_add_all_connectors(helper);
+	if (ret < 0) {
+		DRM_ERROR("failed to register drm_fb_helper_connector.\n");
+		goto err_setup;
+
+	}
+
+	ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
+	if (ret < 0) {
+		DRM_ERROR("failed to set up hw configuration.\n");
+		goto err_setup;
+	}
+
+	return 0;
+
+err_setup:
+	drm_fb_helper_fini(helper);
+
+err_init:
+	private->fb_helper = NULL;
+	kfree(fbdev);
+
+	return ret;
+}
+
+static void exynos_drm_fbdev_destroy(struct drm_device *dev,
+				      struct drm_fb_helper *fb_helper)
+{
+	struct drm_framebuffer *fb;
+
+	/* release drm framebuffer and real buffer */
+	if (fb_helper->fb && fb_helper->fb->funcs) {
+		fb = fb_helper->fb;
+		if (fb && fb->funcs->destroy)
+			fb->funcs->destroy(fb);
+	}
+
+	/* release linux framebuffer */
+	if (fb_helper->fbdev) {
+		struct fb_info *info;
+		int ret;
+
+		info = fb_helper->fbdev;
+		ret = unregister_framebuffer(info);
+		if (ret < 0)
+			DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
+
+		if (info->cmap.len)
+			fb_dealloc_cmap(&info->cmap);
+
+		framebuffer_release(info);
+	}
+
+	drm_fb_helper_fini(fb_helper);
+}
+
+void exynos_drm_fbdev_fini(struct drm_device *dev)
+{
+	struct exynos_drm_private *private = dev->dev_private;
+	struct exynos_drm_fbdev *fbdev;
+
+	if (!private || !private->fb_helper)
+		return;
+
+	fbdev = to_exynos_fbdev(private->fb_helper);
+
+	if (fbdev->exynos_gem_obj)
+		exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
+
+	exynos_drm_fbdev_destroy(dev, private->fb_helper);
+	kfree(fbdev);
+	private->fb_helper = NULL;
+}
+
+void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
+{
+	struct exynos_drm_private *private = dev->dev_private;
+
+	if (!private || !private->fb_helper)
+		return;
+
+	drm_fb_helper_restore_fbdev_mode(private->fb_helper);
+}