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// SPDX-License-Identifier: GPL-2.0
/*
* Management Complex (MC) userspace support
*
* Copyright 2018 NXP
*
*/
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/miscdevice.h>
#define fsl_mc_command __fsl_mc_command
#include <uapi/linux/fsl_mc.h>
#undef fsl_mc_command
#include "fsl-mc-private.h"
struct uapi_priv_data {
struct fsl_mc_uapi *uapi;
struct fsl_mc_io *mc_io;
};
static int fsl_mc_uapi_send_command(unsigned long arg,
struct fsl_mc_io *mc_io)
{
struct fsl_mc_command mc_cmd;
int error;
error = copy_from_user(&mc_cmd, (void __user *)arg, sizeof(mc_cmd));
if (error)
return -EFAULT;
error = mc_send_command(mc_io, &mc_cmd);
if (error)
return error;
error = copy_to_user((void __user *)arg, &mc_cmd, sizeof(mc_cmd));
if (error)
return -EFAULT;
return 0;
}
static int fsl_mc_uapi_dev_open(struct inode *inode, struct file *filep)
{
struct fsl_mc_device *root_mc_device;
struct uapi_priv_data *priv_data;
struct fsl_mc_io *dynamic_mc_io;
struct fsl_mc_uapi *mc_uapi;
struct fsl_mc_bus *mc_bus;
int error;
priv_data = kzalloc(sizeof(*priv_data), GFP_KERNEL);
if (!priv_data)
return -ENOMEM;
mc_uapi = container_of(filep->private_data, struct fsl_mc_uapi, misc);
mc_bus = container_of(mc_uapi, struct fsl_mc_bus, uapi_misc);
root_mc_device = &mc_bus->mc_dev;
mutex_lock(&mc_uapi->mutex);
if (!mc_uapi->local_instance_in_use) {
priv_data->mc_io = mc_uapi->static_mc_io;
mc_uapi->local_instance_in_use = 1;
} else {
error = fsl_mc_portal_allocate(root_mc_device, 0,
&dynamic_mc_io);
if (error) {
dev_dbg(&root_mc_device->dev,
"Could not allocate MC portal\n");
goto error_portal_allocate;
}
priv_data->mc_io = dynamic_mc_io;
}
priv_data->uapi = mc_uapi;
filep->private_data = priv_data;
mutex_unlock(&mc_uapi->mutex);
return 0;
error_portal_allocate:
mutex_unlock(&mc_uapi->mutex);
return error;
}
static int fsl_mc_uapi_dev_release(struct inode *inode, struct file *filep)
{
struct uapi_priv_data *priv_data;
struct fsl_mc_uapi *mc_uapi;
struct fsl_mc_io *mc_io;
priv_data = filep->private_data;
mc_uapi = priv_data->uapi;
mc_io = priv_data->mc_io;
mutex_lock(&mc_uapi->mutex);
if (mc_io == mc_uapi->static_mc_io)
mc_uapi->local_instance_in_use = 0;
else
fsl_mc_portal_free(mc_io);
kfree(filep->private_data);
filep->private_data = NULL;
mutex_unlock(&mc_uapi->mutex);
return 0;
}
static long fsl_mc_uapi_dev_ioctl(struct file *file,
unsigned int cmd,
unsigned long arg)
{
struct uapi_priv_data *priv_data = file->private_data;
struct fsl_mc_device *root_mc_device;
struct fsl_mc_bus *mc_bus;
int error;
mc_bus = container_of(priv_data->uapi, struct fsl_mc_bus, uapi_misc);
root_mc_device = &mc_bus->mc_dev;
switch (cmd) {
case FSL_MC_SEND_MC_COMMAND:
error = fsl_mc_uapi_send_command(arg, priv_data->mc_io);
break;
default:
dev_dbg(&root_mc_device->dev, "unexpected ioctl call number\n");
error = -EINVAL;
}
return error;
}
static const struct file_operations fsl_mc_uapi_dev_fops = {
.owner = THIS_MODULE,
.open = fsl_mc_uapi_dev_open,
.release = fsl_mc_uapi_dev_release,
.unlocked_ioctl = fsl_mc_uapi_dev_ioctl,
};
int fsl_mc_uapi_create_device_file(struct fsl_mc_bus *mc_bus)
{
struct fsl_mc_device *mc_dev = &mc_bus->mc_dev;
struct fsl_mc_uapi *mc_uapi = &mc_bus->uapi_misc;
int error;
mc_uapi->misc.minor = MISC_DYNAMIC_MINOR;
mc_uapi->misc.name = dev_name(&mc_dev->dev);
mc_uapi->misc.fops = &fsl_mc_uapi_dev_fops;
error = misc_register(&mc_uapi->misc);
if (error)
return error;
mc_uapi->static_mc_io = mc_bus->mc_dev.mc_io;
mutex_init(&mc_uapi->mutex);
return 0;
}
void fsl_mc_uapi_remove_device_file(struct fsl_mc_bus *mc_bus)
{
misc_deregister(&mc_bus->uapi_misc.misc);
}
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