Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0+
/*
 * rcar-fcp.c  --  R-Car Frame Compression Processor Driver
 *
 * Copyright (C) 2016 Renesas Electronics Corporation
 *
 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
 */
 
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
 
#include <media/rcar-fcp.h>
 
struct rcar_fcp_device {
<------>struct list_head list;
<------>struct device *dev;
};
 
static LIST_HEAD(fcp_devices);
static DEFINE_MUTEX(fcp_lock);
 
/* -----------------------------------------------------------------------------
 * Public API
 */
 
/**
 * rcar_fcp_get - Find and acquire a reference to an FCP instance
 * @np: Device node of the FCP instance
 *
 * Search the list of registered FCP instances for the instance corresponding to
 * the given device node.
 *
 * Return a pointer to the FCP instance, or an ERR_PTR if the instance can't be
 * found.
 */
struct rcar_fcp_device *rcar_fcp_get(const struct device_node *np)
{
<------>struct rcar_fcp_device *fcp;
 
<------>mutex_lock(&fcp_lock);
 
<------>list_for_each_entry(fcp, &fcp_devices, list) {
<------><------>if (fcp->dev->of_node != np)
<------><------><------>continue;
 
<------><------>get_device(fcp->dev);
<------><------>goto done;
<------>}
 
<------>fcp = ERR_PTR(-EPROBE_DEFER);
 
done:
<------>mutex_unlock(&fcp_lock);
<------>return fcp;
}
EXPORT_SYMBOL_GPL(rcar_fcp_get);
 
/**
 * rcar_fcp_put - Release a reference to an FCP instance
 * @fcp: The FCP instance
 *
 * Release the FCP instance acquired by a call to rcar_fcp_get().
 */
void rcar_fcp_put(struct rcar_fcp_device *fcp)
{
<------>if (fcp)
<------><------>put_device(fcp->dev);
}
EXPORT_SYMBOL_GPL(rcar_fcp_put);
 
struct device *rcar_fcp_get_device(struct rcar_fcp_device *fcp)
{
<------>return fcp->dev;
}
EXPORT_SYMBOL_GPL(rcar_fcp_get_device);
 
/**
 * rcar_fcp_enable - Enable an FCP
 * @fcp: The FCP instance
 *
 * Before any memory access through an FCP is performed by a module, the FCP
 * must be enabled by a call to this function. The enable calls are reference
 * counted, each successful call must be followed by one rcar_fcp_disable()
 * call when no more memory transfer can occur through the FCP.
 *
 * Return 0 on success or a negative error code if an error occurs. The enable
 * reference count isn't increased when this function returns an error.
 */
int rcar_fcp_enable(struct rcar_fcp_device *fcp)
{
<------>int ret;
 
<------>if (!fcp)
<------><------>return 0;
 
<------>ret = pm_runtime_get_sync(fcp->dev);
<------>if (ret < 0) {
<------><------>pm_runtime_put_noidle(fcp->dev);
<------><------>return ret;
<------>}
 
<------>return 0;
}
EXPORT_SYMBOL_GPL(rcar_fcp_enable);
 
/**
 * rcar_fcp_disable - Disable an FCP
 * @fcp: The FCP instance
 *
 * This function is the counterpart of rcar_fcp_enable(). As enable calls are
 * reference counted a disable call may not disable the FCP synchronously.
 */
void rcar_fcp_disable(struct rcar_fcp_device *fcp)
{
<------>if (fcp)
<------><------>pm_runtime_put(fcp->dev);
}
EXPORT_SYMBOL_GPL(rcar_fcp_disable);
 
/* -----------------------------------------------------------------------------
 * Platform Driver
 */
 
static int rcar_fcp_probe(struct platform_device *pdev)
{
<------>struct rcar_fcp_device *fcp;
 
<------>fcp = devm_kzalloc(&pdev->dev, sizeof(*fcp), GFP_KERNEL);
<------>if (fcp == NULL)
<------><------>return -ENOMEM;
 
<------>fcp->dev = &pdev->dev;
 
<------>dma_set_max_seg_size(fcp->dev, UINT_MAX);
 
<------>pm_runtime_enable(&pdev->dev);
 
<------>mutex_lock(&fcp_lock);
<------>list_add_tail(&fcp->list, &fcp_devices);
<------>mutex_unlock(&fcp_lock);
 
<------>platform_set_drvdata(pdev, fcp);
 
<------>return 0;
}
 
static int rcar_fcp_remove(struct platform_device *pdev)
{
<------>struct rcar_fcp_device *fcp = platform_get_drvdata(pdev);
 
<------>mutex_lock(&fcp_lock);
<------>list_del(&fcp->list);
<------>mutex_unlock(&fcp_lock);
 
<------>pm_runtime_disable(&pdev->dev);
 
<------>return 0;
}
 
static const struct of_device_id rcar_fcp_of_match[] = {
<------>{ .compatible = "renesas,fcpf" },
<------>{ .compatible = "renesas,fcpv" },
<------>{ },
};
MODULE_DEVICE_TABLE(of, rcar_fcp_of_match);
 
static struct platform_driver rcar_fcp_platform_driver = {
<------>.probe		= rcar_fcp_probe,
<------>.remove		= rcar_fcp_remove,
<------>.driver		= {
<------><------>.name	= "rcar-fcp",
<------><------>.of_match_table = rcar_fcp_of_match,
<------><------>.suppress_bind_attrs = true,
<------>},
};
 
module_platform_driver(rcar_fcp_platform_driver);
 
MODULE_ALIAS("rcar-fcp");
MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
MODULE_DESCRIPTION("Renesas FCP Driver");
MODULE_LICENSE("GPL");