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340 lines
8.2 KiB
340 lines
8.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2017 Linaro Ltd. |
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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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unsigned int perms; |
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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, 0444, qcom_rmtfs_mem_show, NULL); |
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static DEVICE_ATTR(size, 0444, qcom_rmtfs_mem_show, NULL); |
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static DEVICE_ATTR(client_id, 0444, 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 struct class rmtfs_class = { |
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.owner = THIS_MODULE, |
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.name = "rmtfs", |
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}; |
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static int qcom_rmtfs_mem_mmap(struct file *filep, struct vm_area_struct *vma) |
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{ |
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struct qcom_rmtfs_mem *rmtfs_mem = filep->private_data; |
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if (vma->vm_end - vma->vm_start > rmtfs_mem->size) { |
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dev_dbg(&rmtfs_mem->dev, |
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"vm_end[%lu] - vm_start[%lu] [%lu] > mem->size[%pa]\n", |
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vma->vm_end, vma->vm_start, |
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(vma->vm_end - vma->vm_start), &rmtfs_mem->size); |
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return -EINVAL; |
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} |
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vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); |
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return remap_pfn_range(vma, |
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vma->vm_start, |
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rmtfs_mem->addr >> PAGE_SHIFT, |
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vma->vm_end - vma->vm_start, |
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vma->vm_page_prot); |
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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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.mmap = qcom_rmtfs_mem_mmap, |
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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 qcom_scm_vmperm perms[2]; |
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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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u32 vmid; |
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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->dev.release = qcom_rmtfs_mem_release_device; |
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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.class = &rmtfs_class; |
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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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ret = of_property_read_u32(node, "qcom,vmid", &vmid); |
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if (ret < 0 && ret != -EINVAL) { |
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dev_err(&pdev->dev, "failed to parse qcom,vmid\n"); |
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goto remove_cdev; |
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} else if (!ret) { |
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if (!qcom_scm_is_available()) { |
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ret = -EPROBE_DEFER; |
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goto remove_cdev; |
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} |
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perms[0].vmid = QCOM_SCM_VMID_HLOS; |
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perms[0].perm = QCOM_SCM_PERM_RW; |
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perms[1].vmid = vmid; |
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perms[1].perm = QCOM_SCM_PERM_RW; |
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rmtfs_mem->perms = BIT(QCOM_SCM_VMID_HLOS); |
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ret = qcom_scm_assign_mem(rmtfs_mem->addr, rmtfs_mem->size, |
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&rmtfs_mem->perms, perms, 2); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "assign memory failed\n"); |
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goto remove_cdev; |
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} |
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} |
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dev_set_drvdata(&pdev->dev, rmtfs_mem); |
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return 0; |
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remove_cdev: |
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cdev_device_del(&rmtfs_mem->cdev, &rmtfs_mem->dev); |
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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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struct qcom_scm_vmperm perm; |
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if (rmtfs_mem->perms) { |
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perm.vmid = QCOM_SCM_VMID_HLOS; |
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perm.perm = QCOM_SCM_PERM_RW; |
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qcom_scm_assign_mem(rmtfs_mem->addr, rmtfs_mem->size, |
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&rmtfs_mem->perms, &perm, 1); |
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} |
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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 __init qcom_rmtfs_mem_init(void) |
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{ |
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int ret; |
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ret = class_register(&rmtfs_class); |
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if (ret) |
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return 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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goto unregister_class; |
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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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goto unregister_chrdev; |
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} |
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return 0; |
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unregister_chrdev: |
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unregister_chrdev_region(qcom_rmtfs_mem_major, QCOM_RMTFS_MEM_DEV_MAX); |
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unregister_class: |
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class_unregister(&rmtfs_class); |
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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 __exit 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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class_unregister(&rmtfs_class); |
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} |
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module_exit(qcom_rmtfs_mem_exit); |
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MODULE_AUTHOR("Linaro Ltd"); |
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MODULE_DESCRIPTION("Qualcomm Remote Filesystem memory driver"); |
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MODULE_LICENSE("GPL v2");
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