Release 4.16 drivers/soc/qcom/rmtfs_mem.c
/*
* Copyright (c) 2017 Linaro Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/cdev.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_reserved_mem.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/qcom_scm.h>
#define QCOM_RMTFS_MEM_DEV_MAX (MINORMASK + 1)
static dev_t qcom_rmtfs_mem_major;
struct qcom_rmtfs_mem {
struct device dev;
struct cdev cdev;
void *base;
phys_addr_t addr;
phys_addr_t size;
unsigned int client_id;
};
static ssize_t qcom_rmtfs_mem_show(struct device *dev,
struct device_attribute *attr,
char *buf);
static DEVICE_ATTR(phys_addr, 0400, qcom_rmtfs_mem_show, NULL);
static DEVICE_ATTR(size, 0400, qcom_rmtfs_mem_show, NULL);
static DEVICE_ATTR(client_id, 0400, qcom_rmtfs_mem_show, NULL);
static ssize_t qcom_rmtfs_mem_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct qcom_rmtfs_mem *rmtfs_mem = container_of(dev,
struct qcom_rmtfs_mem,
dev);
if (attr == &dev_attr_phys_addr)
return sprintf(buf, "%pa\n", &rmtfs_mem->addr);
if (attr == &dev_attr_size)
return sprintf(buf, "%pa\n", &rmtfs_mem->size);
if (attr == &dev_attr_client_id)
return sprintf(buf, "%d\n", rmtfs_mem->client_id);
return -EINVAL;
}
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static struct attribute *qcom_rmtfs_mem_attrs[] = {
&dev_attr_phys_addr.attr,
&dev_attr_size.attr,
&dev_attr_client_id.attr,
NULL
};
ATTRIBUTE_GROUPS(qcom_rmtfs_mem);
static int qcom_rmtfs_mem_open(struct inode *inode, struct file *filp)
{
struct qcom_rmtfs_mem *rmtfs_mem = container_of(inode->i_cdev,
struct qcom_rmtfs_mem,
cdev);
get_device(&rmtfs_mem->dev);
filp->private_data = rmtfs_mem;
return 0;
}
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static ssize_t qcom_rmtfs_mem_read(struct file *filp,
char __user *buf, size_t count, loff_t *f_pos)
{
struct qcom_rmtfs_mem *rmtfs_mem = filp->private_data;
if (*f_pos >= rmtfs_mem->size)
return 0;
if (*f_pos + count >= rmtfs_mem->size)
count = rmtfs_mem->size - *f_pos;
if (copy_to_user(buf, rmtfs_mem->base + *f_pos, count))
return -EFAULT;
*f_pos += count;
return count;
}
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static ssize_t qcom_rmtfs_mem_write(struct file *filp,
const char __user *buf, size_t count,
loff_t *f_pos)
{
struct qcom_rmtfs_mem *rmtfs_mem = filp->private_data;
if (*f_pos >= rmtfs_mem->size)
return 0;
if (*f_pos + count >= rmtfs_mem->size)
count = rmtfs_mem->size - *f_pos;
if (copy_from_user(rmtfs_mem->base + *f_pos, buf, count))
return -EFAULT;
*f_pos += count;
return count;
}
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static int qcom_rmtfs_mem_release(struct inode *inode, struct file *filp)
{
struct qcom_rmtfs_mem *rmtfs_mem = filp->private_data;
put_device(&rmtfs_mem->dev);
return 0;
}
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static const struct file_operations qcom_rmtfs_mem_fops = {
.owner = THIS_MODULE,
.open = qcom_rmtfs_mem_open,
.read = qcom_rmtfs_mem_read,
.write = qcom_rmtfs_mem_write,
.release = qcom_rmtfs_mem_release,
.llseek = default_llseek,
};
static void qcom_rmtfs_mem_release_device(struct device *dev)
{
struct qcom_rmtfs_mem *rmtfs_mem = container_of(dev,
struct qcom_rmtfs_mem,
dev);
kfree(rmtfs_mem);
}
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static int qcom_rmtfs_mem_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct reserved_mem *rmem;
struct qcom_rmtfs_mem *rmtfs_mem;
u32 client_id;
int ret;
rmem = of_reserved_mem_lookup(node);
if (!rmem) {
dev_err(&pdev->dev, "failed to acquire memory region\n");
return -EINVAL;
}
ret = of_property_read_u32(node, "qcom,client-id", &client_id);
if (ret) {
dev_err(&pdev->dev, "failed to parse \"qcom,client-id\"\n");
return ret;
}
rmtfs_mem = kzalloc(sizeof(*rmtfs_mem), GFP_KERNEL);
if (!rmtfs_mem)
return -ENOMEM;
rmtfs_mem->addr = rmem->base;
rmtfs_mem->client_id = client_id;
rmtfs_mem->size = rmem->size;
device_initialize(&rmtfs_mem->dev);
rmtfs_mem->dev.parent = &pdev->dev;
rmtfs_mem->dev.groups = qcom_rmtfs_mem_groups;
rmtfs_mem->base = devm_memremap(&rmtfs_mem->dev, rmtfs_mem->addr,
rmtfs_mem->size, MEMREMAP_WC);
if (IS_ERR(rmtfs_mem->base)) {
dev_err(&pdev->dev, "failed to remap rmtfs_mem region\n");
ret = PTR_ERR(rmtfs_mem->base);
goto put_device;
}
cdev_init(&rmtfs_mem->cdev, &qcom_rmtfs_mem_fops);
rmtfs_mem->cdev.owner = THIS_MODULE;
dev_set_name(&rmtfs_mem->dev, "qcom_rmtfs_mem%d", client_id);
rmtfs_mem->dev.id = client_id;
rmtfs_mem->dev.devt = MKDEV(MAJOR(qcom_rmtfs_mem_major), client_id);
ret = cdev_device_add(&rmtfs_mem->cdev, &rmtfs_mem->dev);
if (ret) {
dev_err(&pdev->dev, "failed to add cdev: %d\n", ret);
goto put_device;
}
rmtfs_mem->dev.release = qcom_rmtfs_mem_release_device;
dev_set_drvdata(&pdev->dev, rmtfs_mem);
return 0;
put_device:
put_device(&rmtfs_mem->dev);
return ret;
}
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static int qcom_rmtfs_mem_remove(struct platform_device *pdev)
{
struct qcom_rmtfs_mem *rmtfs_mem = dev_get_drvdata(&pdev->dev);
cdev_device_del(&rmtfs_mem->cdev, &rmtfs_mem->dev);
put_device(&rmtfs_mem->dev);
return 0;
}
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static const struct of_device_id qcom_rmtfs_mem_of_match[] = {
{ .compatible = "qcom,rmtfs-mem" },
{}
};
MODULE_DEVICE_TABLE(of, qcom_rmtfs_mem_of_match);
static struct platform_driver qcom_rmtfs_mem_driver = {
.probe = qcom_rmtfs_mem_probe,
.remove = qcom_rmtfs_mem_remove,
.driver = {
.name = "qcom_rmtfs_mem",
.of_match_table = qcom_rmtfs_mem_of_match,
},
};
static int qcom_rmtfs_mem_init(void)
{
int ret;
ret = alloc_chrdev_region(&qcom_rmtfs_mem_major, 0,
QCOM_RMTFS_MEM_DEV_MAX, "qcom_rmtfs_mem");
if (ret < 0) {
pr_err("qcom_rmtfs_mem: failed to allocate char dev region\n");
return ret;
}
ret = platform_driver_register(&qcom_rmtfs_mem_driver);
if (ret < 0) {
pr_err("qcom_rmtfs_mem: failed to register rmtfs_mem driver\n");
unregister_chrdev_region(qcom_rmtfs_mem_major,
QCOM_RMTFS_MEM_DEV_MAX);
}
return ret;
}
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module_init(qcom_rmtfs_mem_init);
static void qcom_rmtfs_mem_exit(void)
{
platform_driver_unregister(&qcom_rmtfs_mem_driver);
unregister_chrdev_region(qcom_rmtfs_mem_major, QCOM_RMTFS_MEM_DEV_MAX);
}
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module_exit(qcom_rmtfs_mem_exit);
MODULE_AUTHOR("Linaro Ltd");
MODULE_DESCRIPTION("Qualcomm Remote Filesystem memory driver");
MODULE_LICENSE("GPL v2");
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| Total | 1167 | 100.00% | 2 | 100.00% |
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