Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 359 insertions, 0 deletions

diff --git a/drivers/soc/qcom/rmtfs_mem.c b/drivers/soc/qcom/rmtfs_mem.c
new file mode 100644
index 0000000000..f83811f511
--- /dev/null
+++ b/drivers/soc/qcom/rmtfs_mem.c
@@ -0,0 +1,359 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2017 Linaro Ltd.
+ */
+
+#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/firmware/qcom/qcom_scm.h>
+
+#define QCOM_RMTFS_MEM_DEV_MAX	(MINORMASK + 1)
+#define NUM_MAX_VMIDS		2
+
+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;
+
+	u64 perms;
+};
+
+static ssize_t qcom_rmtfs_mem_show(struct device *dev,
+			      struct device_attribute *attr,
+			      char *buf);
+
+static DEVICE_ATTR(phys_addr, 0444, qcom_rmtfs_mem_show, NULL);
+static DEVICE_ATTR(size, 0444, qcom_rmtfs_mem_show, NULL);
+static DEVICE_ATTR(client_id, 0444, 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;
+}
+
+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;
+}
+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;
+}
+
+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;
+}
+
+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;
+}
+
+static struct class rmtfs_class = {
+	.name           = "rmtfs",
+};
+
+static int qcom_rmtfs_mem_mmap(struct file *filep, struct vm_area_struct *vma)
+{
+	struct qcom_rmtfs_mem *rmtfs_mem = filep->private_data;
+
+	if (vma->vm_end - vma->vm_start > rmtfs_mem->size) {
+		dev_dbg(&rmtfs_mem->dev,
+			"vm_end[%lu] - vm_start[%lu] [%lu] > mem->size[%pa]\n",
+			vma->vm_end, vma->vm_start,
+			(vma->vm_end - vma->vm_start), &rmtfs_mem->size);
+		return -EINVAL;
+	}
+
+	vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
+	return remap_pfn_range(vma,
+			       vma->vm_start,
+			       rmtfs_mem->addr >> PAGE_SHIFT,
+			       vma->vm_end - vma->vm_start,
+			       vma->vm_page_prot);
+}
+
+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,
+	.mmap = qcom_rmtfs_mem_mmap,
+};
+
+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);
+}
+
+static int qcom_rmtfs_mem_probe(struct platform_device *pdev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	struct qcom_scm_vmperm perms[NUM_MAX_VMIDS + 1];
+	struct reserved_mem *rmem;
+	struct qcom_rmtfs_mem *rmtfs_mem;
+	u32 client_id;
+	u32 vmid[NUM_MAX_VMIDS];
+	int num_vmids;
+	int ret, i;
+
+	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->dev.release = qcom_rmtfs_mem_release_device;
+
+	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.class = &rmtfs_class;
+	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;
+	}
+
+	num_vmids = of_property_count_u32_elems(node, "qcom,vmid");
+	if (num_vmids == -EINVAL) {
+		/* qcom,vmid is optional */
+		num_vmids = 0;
+	} else if (num_vmids < 0) {
+		dev_err(&pdev->dev, "failed to count qcom,vmid elements: %d\n", num_vmids);
+		ret = num_vmids;
+		goto remove_cdev;
+	} else if (num_vmids > NUM_MAX_VMIDS) {
+		dev_warn(&pdev->dev,
+			 "too many VMIDs (%d) specified! Only mapping first %d entries\n",
+			 num_vmids, NUM_MAX_VMIDS);
+		num_vmids = NUM_MAX_VMIDS;
+	}
+
+	ret = of_property_read_u32_array(node, "qcom,vmid", vmid, num_vmids);
+	if (ret < 0 && ret != -EINVAL) {
+		dev_err(&pdev->dev, "failed to parse qcom,vmid\n");
+		goto remove_cdev;
+	} else if (!ret) {
+		if (!qcom_scm_is_available()) {
+			ret = -EPROBE_DEFER;
+			goto remove_cdev;
+		}
+
+		perms[0].vmid = QCOM_SCM_VMID_HLOS;
+		perms[0].perm = QCOM_SCM_PERM_RW;
+
+		for (i = 0; i < num_vmids; i++) {
+			perms[i + 1].vmid = vmid[i];
+			perms[i + 1].perm = QCOM_SCM_PERM_RW;
+		}
+
+		rmtfs_mem->perms = BIT(QCOM_SCM_VMID_HLOS);
+		ret = qcom_scm_assign_mem(rmtfs_mem->addr, rmtfs_mem->size,
+					  &rmtfs_mem->perms, perms, num_vmids + 1);
+		if (ret < 0) {
+			dev_err(&pdev->dev, "assign memory failed\n");
+			goto remove_cdev;
+		}
+	}
+
+	dev_set_drvdata(&pdev->dev, rmtfs_mem);
+
+	return 0;
+
+remove_cdev:
+	cdev_device_del(&rmtfs_mem->cdev, &rmtfs_mem->dev);
+put_device:
+	put_device(&rmtfs_mem->dev);
+
+	return ret;
+}
+
+static int qcom_rmtfs_mem_remove(struct platform_device *pdev)
+{
+	struct qcom_rmtfs_mem *rmtfs_mem = dev_get_drvdata(&pdev->dev);
+	struct qcom_scm_vmperm perm;
+
+	if (rmtfs_mem->perms) {
+		perm.vmid = QCOM_SCM_VMID_HLOS;
+		perm.perm = QCOM_SCM_PERM_RW;
+
+		qcom_scm_assign_mem(rmtfs_mem->addr, rmtfs_mem->size,
+				    &rmtfs_mem->perms, &perm, 1);
+	}
+
+	cdev_device_del(&rmtfs_mem->cdev, &rmtfs_mem->dev);
+	put_device(&rmtfs_mem->dev);
+
+	return 0;
+}
+
+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 __init qcom_rmtfs_mem_init(void)
+{
+	int ret;
+
+	ret = class_register(&rmtfs_class);
+	if (ret)
+		return 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");
+		goto unregister_class;
+	}
+
+	ret = platform_driver_register(&qcom_rmtfs_mem_driver);
+	if (ret < 0) {
+		pr_err("qcom_rmtfs_mem: failed to register rmtfs_mem driver\n");
+		goto unregister_chrdev;
+	}
+
+	return 0;
+
+unregister_chrdev:
+	unregister_chrdev_region(qcom_rmtfs_mem_major, QCOM_RMTFS_MEM_DEV_MAX);
+unregister_class:
+	class_unregister(&rmtfs_class);
+	return ret;
+}
+module_init(qcom_rmtfs_mem_init);
+
+static void __exit qcom_rmtfs_mem_exit(void)
+{
+	platform_driver_unregister(&qcom_rmtfs_mem_driver);
+	unregister_chrdev_region(qcom_rmtfs_mem_major, QCOM_RMTFS_MEM_DEV_MAX);
+	class_unregister(&rmtfs_class);
+}
+module_exit(qcom_rmtfs_mem_exit);
+
+MODULE_AUTHOR("Linaro Ltd");
+MODULE_DESCRIPTION("Qualcomm Remote Filesystem memory driver");
+MODULE_LICENSE("GPL v2");