From 8e4bff4cab0ddac6060645b0715210484d02ff40 Mon Sep 17 00:00:00 2001
From: Yuval Adam <_@yuv.al>
Date: Wed, 30 Aug 2017 08:25:59 +0000
Subject: Initial file dump from open source release

---
 drivers/video/mmp/core.c | 256 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 256 insertions(+)
 create mode 100644 drivers/video/mmp/core.c

(limited to 'drivers/video/mmp/core.c')

diff --git a/drivers/video/mmp/core.c b/drivers/video/mmp/core.c
new file mode 100644
index 00000000..84de2632
--- /dev/null
+++ b/drivers/video/mmp/core.c
@@ -0,0 +1,256 @@
+/*
+ * linux/drivers/video/mmp/common.c
+ * This driver is a common framework for Marvell Display Controller
+ *
+ * Copyright (C) 2012 Marvell Technology Group Ltd.
+ * Authors: Zhou Zhu <zzhu3@marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/export.h>
+#include <video/mmp_disp.h>
+
+static struct mmp_overlay *path_get_overlay(struct mmp_path *path,
+		int overlay_id)
+{
+	if (path && overlay_id < path->overlay_num)
+		return &path->overlays[overlay_id];
+	return 0;
+}
+
+static int path_check_status(struct mmp_path *path)
+{
+	int i;
+	for (i = 0; i < path->overlay_num; i++)
+		if (path->overlays[i].status)
+			return 1;
+
+	return 0;
+}
+
+/*
+ * Get modelist write pointer of modelist.
+ * It also returns modelist number
+ * this function fetches modelist from phy/panel:
+ *   for HDMI/parallel or dsi to hdmi cases, get from phy
+ *   or get from panel
+ */
+static int path_get_modelist(struct mmp_path *path,
+		struct mmp_mode **modelist)
+{
+	BUG_ON(!path || !modelist);
+
+	if (path->panel && path->panel->get_modelist)
+		return path->panel->get_modelist(path->panel, modelist);
+
+	return 0;
+}
+
+/*
+ * panel list is used to pair panel/path when path/panel registered
+ * path list is used for both buffer driver and platdriver
+ * plat driver do path register/unregister
+ * panel driver do panel register/unregister
+ * buffer driver get registered path
+ */
+static LIST_HEAD(panel_list);
+static LIST_HEAD(path_list);
+static DEFINE_MUTEX(disp_lock);
+
+/*
+ * mmp_register_panel - register panel to panel_list and connect to path
+ * @p: panel to be registered
+ *
+ * this function provides interface for panel drivers to register panel
+ * to panel_list and connect to path which matchs panel->plat_path_name.
+ * no error returns when no matching path is found as path register after
+ * panel register is permitted.
+ */
+void mmp_register_panel(struct mmp_panel *panel)
+{
+	struct mmp_path *path;
+
+	mutex_lock(&disp_lock);
+
+	/* add */
+	list_add_tail(&panel->node, &panel_list);
+
+	/* try to register to path */
+	list_for_each_entry(path, &path_list, node) {
+		if (!strcmp(panel->plat_path_name, path->name)) {
+			dev_info(panel->dev, "connect to path %s\n",
+				path->name);
+			path->panel = panel;
+			break;
+		}
+	}
+
+	mutex_unlock(&disp_lock);
+}
+EXPORT_SYMBOL_GPL(mmp_register_panel);
+
+/*
+ * mmp_unregister_panel - unregister panel from panel_list and disconnect
+ * @p: panel to be unregistered
+ *
+ * this function provides interface for panel drivers to unregister panel
+ * from panel_list and disconnect from path.
+ */
+void mmp_unregister_panel(struct mmp_panel *panel)
+{
+	struct mmp_path *path;
+
+	mutex_lock(&disp_lock);
+	list_del(&panel->node);
+
+	list_for_each_entry(path, &path_list, node) {
+		if (path->panel && path->panel == panel) {
+			dev_info(panel->dev, "disconnect from path %s\n",
+				path->name);
+			path->panel = NULL;
+			break;
+		}
+	}
+	mutex_unlock(&disp_lock);
+}
+EXPORT_SYMBOL_GPL(mmp_unregister_panel);
+
+/*
+ * mmp_get_path - get path by name
+ * @p: path name
+ *
+ * this function checks path name in path_list and return matching path
+ * return NULL if no matching path
+ */
+struct mmp_path *mmp_get_path(const char *name)
+{
+	struct mmp_path *path;
+	int found = 0;
+
+	mutex_lock(&disp_lock);
+	list_for_each_entry(path, &path_list, node) {
+		if (!strcmp(name, path->name)) {
+			found = 1;
+			break;
+		}
+	}
+	mutex_unlock(&disp_lock);
+
+	return found ? path : NULL;
+}
+EXPORT_SYMBOL_GPL(mmp_get_path);
+
+/*
+ * mmp_register_path - init and register path by path_info
+ * @p: path info provided by display controller
+ *
+ * this function init by path info and register path to path_list
+ * this function also try to connect path with panel by name
+ */
+struct mmp_path *mmp_register_path(struct mmp_path_info *info)
+{
+	int i;
+	size_t size;
+	struct mmp_path *path = NULL;
+	struct mmp_panel *panel;
+
+	size = sizeof(struct mmp_path)
+		+ sizeof(struct mmp_overlay) * info->overlay_num;
+	path = kzalloc(size, GFP_KERNEL);
+	if (!path)
+		goto failed;
+
+	/* path set */
+	mutex_init(&path->access_ok);
+	path->dev = info->dev;
+	path->id = info->id;
+	path->name = info->name;
+	path->output_type = info->output_type;
+	path->overlay_num = info->overlay_num;
+	path->plat_data = info->plat_data;
+	path->ops.set_mode = info->set_mode;
+
+	mutex_lock(&disp_lock);
+	/* get panel */
+	list_for_each_entry(panel, &panel_list, node) {
+		if (!strcmp(info->name, panel->plat_path_name)) {
+			dev_info(path->dev, "get panel %s\n", panel->name);
+			path->panel = panel;
+			break;
+		}
+	}
+
+	dev_info(path->dev, "register %s, overlay_num %d\n",
+			path->name, path->overlay_num);
+
+	/* default op set: if already set by driver, never cover it */
+	if (!path->ops.check_status)
+		path->ops.check_status = path_check_status;
+	if (!path->ops.get_overlay)
+		path->ops.get_overlay = path_get_overlay;
+	if (!path->ops.get_modelist)
+		path->ops.get_modelist = path_get_modelist;
+
+	/* step3: init overlays */
+	for (i = 0; i < path->overlay_num; i++) {
+		path->overlays[i].path = path;
+		path->overlays[i].id = i;
+		mutex_init(&path->overlays[i].access_ok);
+		path->overlays[i].ops = info->overlay_ops;
+	}
+
+	/* add to pathlist */
+	list_add_tail(&path->node, &path_list);
+
+	mutex_unlock(&disp_lock);
+	return path;
+
+failed:
+	kfree(path);
+	mutex_unlock(&disp_lock);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(mmp_register_path);
+
+/*
+ * mmp_unregister_path - unregister and destory path
+ * @p: path to be destoried.
+ *
+ * this function registers path and destorys it.
+ */
+void mmp_unregister_path(struct mmp_path *path)
+{
+	int i;
+
+	if (!path)
+		return;
+
+	mutex_lock(&disp_lock);
+	/* del from pathlist */
+	list_del(&path->node);
+
+	/* deinit overlays */
+	for (i = 0; i < path->overlay_num; i++)
+		mutex_destroy(&path->overlays[i].access_ok);
+
+	mutex_destroy(&path->access_ok);
+
+	kfree(path);
+	mutex_unlock(&disp_lock);
+}
+EXPORT_SYMBOL_GPL(mmp_unregister_path);
-- 
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