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