1 files changed, 456 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 0000000..1f4b3d1
--- /dev/null
+++ b/drivers/gpu/drm/exynos/exynos_drm_fbdev.c
@@ -0,0 +1,456 @@
+/* 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_buf.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 drm_framebuffer	*fb;
+};
+
+static int exynos_drm_fbdev_set_par(struct fb_info *info)
+{
+	struct fb_var_screeninfo *var = &info->var;
+
+	switch (var->bits_per_pixel) {
+	case 32:
+	case 24:
+	case 18:
+	case 16:
+	case 12:
+		info->fix.visual = FB_VISUAL_TRUECOLOR;
+		break;
+	case 1:
+		info->fix.visual = FB_VISUAL_MONO01;
+		break;
+	default:
+		info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
+		break;
+	}
+
+	info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;
+
+	return drm_fb_helper_set_par(info);
+}
+
+
+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	= exynos_drm_fbdev_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,
+				     unsigned int fb_width,
+				     unsigned int fb_height)
+{
+	struct fb_info *fbi = helper->fbdev;
+	struct drm_device *dev = helper->dev;
+	struct exynos_drm_fbdev *exynos_fb = to_exynos_fbdev(helper);
+	struct exynos_drm_buf_entry *entry;
+	unsigned int size = fb_width * fb_height * (fb->bits_per_pixel >> 3);
+	unsigned long offset;
+
+	DRM_DEBUG_KMS("%s\n", __FILE__);
+
+	exynos_fb->fb = fb;
+
+	drm_fb_helper_fill_fix(fbi, fb->pitch, fb->depth);
+	drm_fb_helper_fill_var(fbi, helper, fb_width, fb_height);
+
+	entry = exynos_drm_fb_get_buf(fb);
+	if (!entry) {
+		DRM_LOG_KMS("entry is null.\n");
+		return -EFAULT;
+	}
+
+	offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
+	offset += fbi->var.yoffset * fb->pitch;
+
+	dev->mode_config.fb_base = entry->paddr;
+	fbi->screen_base = entry->vaddr + offset;
+	fbi->fix.smem_start = entry->paddr + 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 drm_device *dev = helper->dev;
+	struct fb_info *fbi;
+	struct drm_mode_fb_cmd mode_cmd = { 0 };
+	struct platform_device *pdev = dev->platformdev;
+	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.bpp = sizes->surface_bpp;
+	mode_cmd.depth = 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;
+	}
+
+	exynos_fbdev->fb = exynos_drm_fb_create(dev, NULL, &mode_cmd);
+	if (IS_ERR_OR_NULL(exynos_fbdev->fb)) {
+		DRM_ERROR("failed to create drm framebuffer.\n");
+		ret = PTR_ERR(exynos_fbdev->fb);
+		goto out;
+	}
+
+	helper->fb = exynos_fbdev->fb;
+	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, sizes->fb_width,
+			sizes->fb_height);
+	if (ret < 0)
+		fb_dealloc_cmap(&fbi->cmap);
+
+/*
+ * 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 bool
+exynos_drm_fbdev_is_samefb(struct drm_framebuffer *fb,
+			    struct drm_fb_helper_surface_size *sizes)
+{
+	if (fb->width != sizes->surface_width)
+		return false;
+	if (fb->height != sizes->surface_height)
+		return false;
+	if (fb->bits_per_pixel != sizes->surface_bpp)
+		return false;
+	if (fb->depth != sizes->surface_depth)
+		return false;
+
+	return true;
+}
+
+static int exynos_drm_fbdev_recreate(struct drm_fb_helper *helper,
+				      struct drm_fb_helper_surface_size *sizes)
+{
+	struct drm_device *dev = helper->dev;
+	struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
+	struct drm_framebuffer *fb = exynos_fbdev->fb;
+	struct drm_mode_fb_cmd mode_cmd = { 0 };
+
+	DRM_DEBUG_KMS("%s\n", __FILE__);
+
+	if (helper->fb != fb) {
+		DRM_ERROR("drm framebuffer is different\n");
+		return -EINVAL;
+	}
+
+	if (exynos_drm_fbdev_is_samefb(fb, sizes))
+		return 0;
+
+	mode_cmd.width = sizes->surface_width;
+	mode_cmd.height = sizes->surface_height;
+	mode_cmd.bpp = sizes->surface_bpp;
+	mode_cmd.depth = sizes->surface_depth;
+
+	if (fb->funcs->destroy)
+		fb->funcs->destroy(fb);
+
+	exynos_fbdev->fb = exynos_drm_fb_create(dev, NULL, &mode_cmd);
+	if (IS_ERR(exynos_fbdev->fb)) {
+		DRM_ERROR("failed to allocate fb.\n");
+		return PTR_ERR(exynos_fbdev->fb);
+	}
+
+	helper->fb = exynos_fbdev->fb;
+	return exynos_drm_fbdev_update(helper, helper->fb, sizes->fb_width,
+			sizes->fb_height);
+}
+
+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__);
+
+	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;
+	} else {
+		ret = exynos_drm_fbdev_recreate(helper, sizes);
+		if (ret < 0) {
+			DRM_ERROR("failed to reconfigure fbdev\n");
+			return ret;
+		}
+	}
+
+	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);
+
+	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);
+}
+
+int exynos_drm_fbdev_reinit(struct drm_device *dev)
+{
+	struct exynos_drm_private *private = dev->dev_private;
+	struct drm_fb_helper *fb_helper;
+	int ret;
+
+	if (!private)
+		return -EINVAL;
+
+	/*
+	 * if all sub drivers were unloaded then num_connector is 0
+	 * so at this time, the framebuffers also should be destroyed.
+	 */
+	if (!dev->mode_config.num_connector) {
+		exynos_drm_fbdev_fini(dev);
+		return 0;
+	}
+
+	fb_helper = private->fb_helper;
+
+	if (fb_helper) {
+		drm_fb_helper_fini(fb_helper);
+
+		ret = drm_fb_helper_init(dev, fb_helper,
+				dev->mode_config.num_crtc, MAX_CONNECTOR);
+		if (ret < 0) {
+			DRM_ERROR("failed to initialize drm fb helper\n");
+			return ret;
+		}
+
+		ret = drm_fb_helper_single_add_all_connectors(fb_helper);
+		if (ret < 0) {
+			DRM_ERROR("failed to add fb helper to connectors\n");
+			goto err;
+		}
+
+		ret = drm_fb_helper_initial_config(fb_helper, PREFERRED_BPP);
+		if (ret < 0) {
+			DRM_ERROR("failed to set up hw configuration.\n");
+			goto err;
+		}
+	} else {
+		/*
+		 * if drm_load() failed whem drm load() was called prior
+		 * to specific drivers, fb_helper must be NULL and so
+		 * this fuction should be called again to re-initialize and
+		 * re-configure the fb helper. it means that this function
+		 * has been called by the specific drivers.
+		 */
+		ret = exynos_drm_fbdev_init(dev);
+	}
+
+	return ret;
+
+err:
+	/*
+	 * if drm_load() failed when drm load() was called prior
+	 * to specific drivers, the fb_helper must be NULL and so check it.
+	 */
+	if (fb_helper)
+		drm_fb_helper_fini(fb_helper);
+
+	return ret;
+}
+
+MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
+MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
+MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
+MODULE_DESCRIPTION("Samsung SoC DRM FBDEV Driver");
+MODULE_LICENSE("GPL");