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// SPDX-License-Identifier: GPL-2.0
/*
* Xilinx SDFEC
*
* Copyright (C) 2019 Xilinx, Inc.
*
* Description:
* This driver is developed for SDFEC16 (Soft Decision FEC 16nm)
* IP. It exposes a char device which supports file operations
* like open(), close() and ioctl().
*/
#include <linux/miscdevice.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/clk.h>
#define DEV_NAME_LEN 12
static struct idr dev_idr;
static struct mutex dev_idr_lock;
/**
* struct xsdfec_dev - Driver data for SDFEC
* @regs: device physical base address
* @dev: pointer to device struct
* @miscdev: Misc device handle
* @error_data_lock: Error counter and states spinlock
* @dev_name: Device name
* @dev_id: Device ID
*
* This structure contains necessary state for SDFEC driver to operate
*/
struct xsdfec_dev {
void __iomem *regs;
struct device *dev;
struct miscdevice miscdev;
/* Spinlock to protect state_updated and stats_updated */
spinlock_t error_data_lock;
char dev_name[DEV_NAME_LEN];
int dev_id;
};
static const struct file_operations xsdfec_fops = {
.owner = THIS_MODULE,
};
static void xsdfec_idr_remove(struct xsdfec_dev *xsdfec)
{
mutex_lock(&dev_idr_lock);
idr_remove(&dev_idr, xsdfec->dev_id);
mutex_unlock(&dev_idr_lock);
}
static int xsdfec_probe(struct platform_device *pdev)
{
struct xsdfec_dev *xsdfec;
struct device *dev;
struct resource *res;
int err;
xsdfec = devm_kzalloc(&pdev->dev, sizeof(*xsdfec), GFP_KERNEL);
if (!xsdfec)
return -ENOMEM;
xsdfec->dev = &pdev->dev;
spin_lock_init(&xsdfec->error_data_lock);
dev = xsdfec->dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
xsdfec->regs = devm_ioremap_resource(dev, res);
if (IS_ERR(xsdfec->regs)) {
err = PTR_ERR(xsdfec->regs);
return err;
}
/* Save driver private data */
platform_set_drvdata(pdev, xsdfec);
mutex_lock(&dev_idr_lock);
err = idr_alloc(&dev_idr, xsdfec->dev_name, 0, 0, GFP_KERNEL);
mutex_unlock(&dev_idr_lock);
if (err < 0)
goto err_xsddev_idr;
xsdfec->dev_id = err;
snprintf(xsdfec->dev_name, DEV_NAME_LEN, "xsdfec%d", xsdfec->dev_id);
xsdfec->miscdev.minor = MISC_DYNAMIC_MINOR;
xsdfec->miscdev.name = xsdfec->dev_name;
xsdfec->miscdev.fops = &xsdfec_fops;
xsdfec->miscdev.parent = dev;
err = misc_register(&xsdfec->miscdev);
if (err) {
dev_err(dev, "error:%d. Unable to register device", err);
return err;
}
return 0;
err_xsddev_idr:
xsdfec_idr_remove(xsdfec);
return err;
}
static int xsdfec_remove(struct platform_device *pdev)
{
struct xsdfec_dev *xsdfec;
xsdfec = platform_get_drvdata(pdev);
misc_deregister(&xsdfec->miscdev);
xsdfec_idr_remove(xsdfec);
return 0;
}
static const struct of_device_id xsdfec_of_match[] = {
{
.compatible = "xlnx,sd-fec-1.1",
},
{ /* end of table */ }
};
MODULE_DEVICE_TABLE(of, xsdfec_of_match);
static struct platform_driver xsdfec_driver = {
.driver = {
.name = "xilinx-sdfec",
.of_match_table = xsdfec_of_match,
},
.probe = xsdfec_probe,
.remove = xsdfec_remove,
};
static int __init xsdfec_init(void)
{
int err;
mutex_init(&dev_idr_lock);
idr_init(&dev_idr);
err = platform_driver_register(&xsdfec_driver);
if (err < 0) {
pr_err("%s Unabled to register SDFEC driver", __func__);
return err;
}
return 0;
}
static void __exit xsdfec_exit(void)
{
platform_driver_unregister(&xsdfec_driver);
idr_destroy(&dev_idr);
}
module_init(xsdfec_init);
module_exit(xsdfec_exit);
MODULE_AUTHOR("Xilinx, Inc");
MODULE_DESCRIPTION("Xilinx SD-FEC16 Driver");
MODULE_LICENSE("GPL");
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