// SPDX-License-Identifier: GPL-2.0-only
/*
* OMAP Display Subsystem Base
*
* Copyright (C) 2015-2017 Texas Instruments Incorporated - https://www.ti.com/
*/
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include "dss.h"
#include "omapdss.h"
struct dispc_device *dispc_get_dispc(struct dss_device *dss)
{
return dss->dispc;
}
/* -----------------------------------------------------------------------------
* OMAP DSS Devices Handling
*/
static LIST_HEAD(omapdss_devices_list);
static DEFINE_MUTEX(omapdss_devices_lock);
void omapdss_device_register(struct omap_dss_device *dssdev)
{
mutex_lock(&omapdss_devices_lock);
list_add_tail(&dssdev->list, &omapdss_devices_list);
mutex_unlock(&omapdss_devices_lock);
}
void omapdss_device_unregister(struct omap_dss_device *dssdev)
{
mutex_lock(&omapdss_devices_lock);
list_del(&dssdev->list);
mutex_unlock(&omapdss_devices_lock);
}
static bool omapdss_device_is_registered(struct device_node *node)
{
struct omap_dss_device *dssdev;
bool found = false;
mutex_lock(&omapdss_devices_lock);
list_for_each_entry(dssdev, &omapdss_devices_list, list) {
if (dssdev->dev->of_node == node) {
found = true;
break;
}
}
mutex_unlock(&omapdss_devices_lock);
return found;
}
struct omap_dss_device *omapdss_device_get(struct omap_dss_device *dssdev)
{
if (get_device(dssdev->dev) == NULL)
return NULL;
return dssdev;
}
void omapdss_device_put(struct omap_dss_device *dssdev)
{
put_device(dssdev->dev);
}
struct omap_dss_device *omapdss_find_device_by_node(struct device_node *node)
{
struct omap_dss_device *dssdev;
list_for_each_entry(dssdev, &omapdss_devices_list, list) {
if (dssdev->dev->of_node == node)
return omapdss_device_get(dssdev);
}
return NULL;
}
/*
* Search for the next output device starting at @from. Release the reference to
* the @from device, and acquire a reference to the returned device if found.
*/
struct omap_dss_device *omapdss_device_next_output(struct omap_dss_device *from)
{
struct omap_dss_device *dssdev;
struct list_head *list;
mutex_lock(&omapdss_devices_lock);
if (list_empty(&omapdss_devices_list)) {
dssdev = NULL;
goto done;
}
/*
* Start from the from entry if given or from omapdss_devices_list
* otherwise.
*/
list = from ? &from->list : &omapdss_devices_list;
list_for_each_entry(dssdev, list, list) {
/*
* Stop if we reach the omapdss_devices_list, that's the end of
* the list.
*/
if (&dssdev->list == &omapdss_devices_list) {
dssdev = NULL;
goto done;
}
if (dssdev->id && dssdev->bridge)
goto done;
}
dssdev = NULL;
done:
if (from)
omapdss_device_put(from);
if (dssdev)
omapdss_device_get(dssdev);
mutex_unlock(&omapdss_devices_lock);
return dssdev;
}
static bool omapdss_device_is_connected(struct omap_dss_device *dssdev)
{
return dssdev->dss;
}
int omapdss_device_connect(struct dss_device *dss,
struct omap_dss_device *src,
struct omap_dss_device *dst)
{
dev_dbg(&dss->pdev->dev, "connect(%s, %s)\n",
src ? dev_name(src->dev) : "NULL",
dst ? dev_name(dst->dev) : "NULL");
if (!dst) {
/*
* The destination is NULL when the source is connected to a
* bridge instead of a DSS device. Stop here, we will attach
* the bridge later when we will have a DRM encoder.
*/
return src && src->bridge ? 0 : -EINVAL;
}
if (omapdss_device_is_connected(dst))
return -EBUSY;
dst->dss = dss;
return 0;
}
void omapdss_device_disconnect(struct omap_dss_device *src,
struct omap_dss_device *dst)
{
struct dss_device *dss = src ? src->dss : dst->dss;
dev_dbg(&dss->pdev->dev, "disconnect(%s, %s)\n",
src ? dev_name(src->dev) : "NULL",
dst ? dev_name(dst->dev) : "NULL");
if (!dst) {
WARN_ON(!src->bridge);
return;
}
if (!dst->id && !omapdss_device_is_connected(dst)) {
WARN_ON(1);
return;
}
dst->dss = NULL;
}
/* -----------------------------------------------------------------------------
* Components Handling
*/
static struct list_head omapdss_comp_list;
struct omapdss_comp_node {
struct list_head list;
struct device_node *node;
bool dss_core_component;
const char *compat;
};
static bool omapdss_list_contains(const struct device_node *node)
{
struct omapdss_comp_node *comp;
list_for_each_entry(comp, &omapdss_comp_list, list) {
if (comp->node == node)
return true;
}
return false;
}
static void omapdss_walk_device(struct device *dev, struct device_node *node,
bool dss_core)
{
struct omapdss_comp_node *comp;
struct device_node *n;
const char *compat;
int ret;
ret = of_property_read_string(node, "compatible", &compat);
if (ret < 0)
return;
comp = devm_kzalloc(dev, sizeof(*comp), GFP_KERNEL);
if (comp) {
comp->node = node;
comp->dss_core_component = dss_core;
comp->compat = compat;
list_add(&comp->list, &omapdss_comp_list);
}
/*
* of_graph_get_remote_port_parent() prints an error if there is no
* port/ports node. To avoid that, check first that there's the node.
*/
n = of_get_child_by_name(node, "ports");
if (!n)
n = of_get_child_by_name(node, "port");
if (!n)
return;
of_node_put(n);
for_each_endpoint_of_node(node, n) {
struct device_node *pn = of_graph_get_remote_port_parent(n);
if (!pn)
continue;
if (!of_device_is_available(pn) || omapdss_list_contains(pn)) {
of_node_put(pn);
continue;
}
omapdss_walk_device(dev, pn, false);
}
}
void omapdss_gather_components(struct device *dev)
{
struct device_node *child;
INIT_LIST_HEAD(&omapdss_comp_list);
omapdss_walk_device(dev, dev->of_node, true);
for_each_available_child_of_node(dev->of_node, child)
omapdss_walk_device(dev, child, true);
}
static bool omapdss_component_is_loaded(struct omapdss_comp_node *comp)
{
if (comp->dss_core_component)
return true;
if (!strstarts(comp->compat, "omapdss,"))
return true;
if (omapdss_device_is_registered(comp->node))
return true;
return false;
}
bool omapdss_stack_is_ready(void)
{
struct omapdss_comp_node *comp;
list_for_each_entry(comp, &omapdss_comp_list, list) {
if (!omapdss_component_is_loaded(comp))
return false;
}
return true;
}
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