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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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>
*/
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/export.h>
#include <linux/module.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 NULL;
}
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;
struct mmp_path *path = NULL;
struct mmp_panel *panel;
path = kzalloc(struct_size(path, overlays, info->overlay_num),
GFP_KERNEL);
if (!path)
return NULL;
/* 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;
}
EXPORT_SYMBOL_GPL(mmp_register_path);
/*
* mmp_unregister_path - unregister and destroy path
* @p: path to be destroyed.
*
* this function registers path and destroys 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);
MODULE_AUTHOR("Zhou Zhu <zzhu3@marvell.com>");
MODULE_DESCRIPTION("Marvell MMP display framework");
MODULE_LICENSE("GPL");
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