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d1de6d6c BA |
1 | /* |
2 | * Copyright (c) 2017 Linaro Ltd. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 and | |
6 | * only version 2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/cdev.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/of.h> | |
20 | #include <linux/of_reserved_mem.h> | |
21 | #include <linux/dma-mapping.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/uaccess.h> | |
24 | #include <linux/io.h> | |
25 | #include <linux/qcom_scm.h> | |
26 | ||
27 | #define QCOM_RMTFS_MEM_DEV_MAX (MINORMASK + 1) | |
28 | ||
29 | static dev_t qcom_rmtfs_mem_major; | |
30 | ||
31 | struct qcom_rmtfs_mem { | |
32 | struct device dev; | |
33 | struct cdev cdev; | |
34 | ||
35 | void *base; | |
36 | phys_addr_t addr; | |
37 | phys_addr_t size; | |
38 | ||
39 | unsigned int client_id; | |
40 | }; | |
41 | ||
42 | static ssize_t qcom_rmtfs_mem_show(struct device *dev, | |
43 | struct device_attribute *attr, | |
44 | char *buf); | |
45 | ||
46 | static DEVICE_ATTR(phys_addr, 0400, qcom_rmtfs_mem_show, NULL); | |
47 | static DEVICE_ATTR(size, 0400, qcom_rmtfs_mem_show, NULL); | |
48 | static DEVICE_ATTR(client_id, 0400, qcom_rmtfs_mem_show, NULL); | |
49 | ||
50 | static ssize_t qcom_rmtfs_mem_show(struct device *dev, | |
51 | struct device_attribute *attr, | |
52 | char *buf) | |
53 | { | |
54 | struct qcom_rmtfs_mem *rmtfs_mem = container_of(dev, | |
55 | struct qcom_rmtfs_mem, | |
56 | dev); | |
57 | ||
58 | if (attr == &dev_attr_phys_addr) | |
59 | return sprintf(buf, "%pa\n", &rmtfs_mem->addr); | |
60 | if (attr == &dev_attr_size) | |
61 | return sprintf(buf, "%pa\n", &rmtfs_mem->size); | |
62 | if (attr == &dev_attr_client_id) | |
63 | return sprintf(buf, "%d\n", rmtfs_mem->client_id); | |
64 | ||
65 | return -EINVAL; | |
66 | } | |
67 | ||
68 | static struct attribute *qcom_rmtfs_mem_attrs[] = { | |
69 | &dev_attr_phys_addr.attr, | |
70 | &dev_attr_size.attr, | |
71 | &dev_attr_client_id.attr, | |
72 | NULL | |
73 | }; | |
74 | ATTRIBUTE_GROUPS(qcom_rmtfs_mem); | |
75 | ||
76 | static int qcom_rmtfs_mem_open(struct inode *inode, struct file *filp) | |
77 | { | |
78 | struct qcom_rmtfs_mem *rmtfs_mem = container_of(inode->i_cdev, | |
79 | struct qcom_rmtfs_mem, | |
80 | cdev); | |
81 | ||
82 | get_device(&rmtfs_mem->dev); | |
83 | filp->private_data = rmtfs_mem; | |
84 | ||
85 | return 0; | |
86 | } | |
87 | static ssize_t qcom_rmtfs_mem_read(struct file *filp, | |
88 | char __user *buf, size_t count, loff_t *f_pos) | |
89 | { | |
90 | struct qcom_rmtfs_mem *rmtfs_mem = filp->private_data; | |
91 | ||
92 | if (*f_pos >= rmtfs_mem->size) | |
93 | return 0; | |
94 | ||
95 | if (*f_pos + count >= rmtfs_mem->size) | |
96 | count = rmtfs_mem->size - *f_pos; | |
97 | ||
98 | if (copy_to_user(buf, rmtfs_mem->base + *f_pos, count)) | |
99 | return -EFAULT; | |
100 | ||
101 | *f_pos += count; | |
102 | return count; | |
103 | } | |
104 | ||
105 | static ssize_t qcom_rmtfs_mem_write(struct file *filp, | |
106 | const char __user *buf, size_t count, | |
107 | loff_t *f_pos) | |
108 | { | |
109 | struct qcom_rmtfs_mem *rmtfs_mem = filp->private_data; | |
110 | ||
111 | if (*f_pos >= rmtfs_mem->size) | |
112 | return 0; | |
113 | ||
114 | if (*f_pos + count >= rmtfs_mem->size) | |
115 | count = rmtfs_mem->size - *f_pos; | |
116 | ||
117 | if (copy_from_user(rmtfs_mem->base + *f_pos, buf, count)) | |
118 | return -EFAULT; | |
119 | ||
120 | *f_pos += count; | |
121 | return count; | |
122 | } | |
123 | ||
124 | static int qcom_rmtfs_mem_release(struct inode *inode, struct file *filp) | |
125 | { | |
126 | struct qcom_rmtfs_mem *rmtfs_mem = filp->private_data; | |
127 | ||
128 | put_device(&rmtfs_mem->dev); | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
133 | static const struct file_operations qcom_rmtfs_mem_fops = { | |
134 | .owner = THIS_MODULE, | |
135 | .open = qcom_rmtfs_mem_open, | |
136 | .read = qcom_rmtfs_mem_read, | |
137 | .write = qcom_rmtfs_mem_write, | |
138 | .release = qcom_rmtfs_mem_release, | |
139 | .llseek = default_llseek, | |
140 | }; | |
141 | ||
142 | static void qcom_rmtfs_mem_release_device(struct device *dev) | |
143 | { | |
144 | struct qcom_rmtfs_mem *rmtfs_mem = container_of(dev, | |
145 | struct qcom_rmtfs_mem, | |
146 | dev); | |
147 | ||
148 | kfree(rmtfs_mem); | |
149 | } | |
150 | ||
151 | static int qcom_rmtfs_mem_probe(struct platform_device *pdev) | |
152 | { | |
153 | struct device_node *node = pdev->dev.of_node; | |
154 | struct reserved_mem *rmem; | |
155 | struct qcom_rmtfs_mem *rmtfs_mem; | |
156 | u32 client_id; | |
157 | int ret; | |
158 | ||
159 | rmem = of_reserved_mem_lookup(node); | |
160 | if (!rmem) { | |
161 | dev_err(&pdev->dev, "failed to acquire memory region\n"); | |
162 | return -EINVAL; | |
163 | } | |
164 | ||
165 | ret = of_property_read_u32(node, "qcom,client-id", &client_id); | |
166 | if (ret) { | |
167 | dev_err(&pdev->dev, "failed to parse \"qcom,client-id\"\n"); | |
168 | return ret; | |
169 | ||
170 | } | |
171 | ||
172 | rmtfs_mem = kzalloc(sizeof(*rmtfs_mem), GFP_KERNEL); | |
173 | if (!rmtfs_mem) | |
174 | return -ENOMEM; | |
175 | ||
176 | rmtfs_mem->addr = rmem->base; | |
177 | rmtfs_mem->client_id = client_id; | |
178 | rmtfs_mem->size = rmem->size; | |
179 | ||
180 | device_initialize(&rmtfs_mem->dev); | |
181 | rmtfs_mem->dev.parent = &pdev->dev; | |
182 | rmtfs_mem->dev.groups = qcom_rmtfs_mem_groups; | |
183 | ||
184 | rmtfs_mem->base = devm_memremap(&rmtfs_mem->dev, rmtfs_mem->addr, | |
185 | rmtfs_mem->size, MEMREMAP_WC); | |
186 | if (IS_ERR(rmtfs_mem->base)) { | |
187 | dev_err(&pdev->dev, "failed to remap rmtfs_mem region\n"); | |
188 | ret = PTR_ERR(rmtfs_mem->base); | |
189 | goto put_device; | |
190 | } | |
191 | ||
192 | cdev_init(&rmtfs_mem->cdev, &qcom_rmtfs_mem_fops); | |
193 | rmtfs_mem->cdev.owner = THIS_MODULE; | |
194 | ||
195 | dev_set_name(&rmtfs_mem->dev, "qcom_rmtfs_mem%d", client_id); | |
196 | rmtfs_mem->dev.id = client_id; | |
197 | rmtfs_mem->dev.devt = MKDEV(MAJOR(qcom_rmtfs_mem_major), client_id); | |
198 | ||
199 | ret = cdev_device_add(&rmtfs_mem->cdev, &rmtfs_mem->dev); | |
200 | if (ret) { | |
201 | dev_err(&pdev->dev, "failed to add cdev: %d\n", ret); | |
202 | goto put_device; | |
203 | } | |
204 | ||
205 | rmtfs_mem->dev.release = qcom_rmtfs_mem_release_device; | |
206 | ||
207 | dev_set_drvdata(&pdev->dev, rmtfs_mem); | |
208 | ||
209 | return 0; | |
210 | ||
d1de6d6c BA |
211 | put_device: |
212 | put_device(&rmtfs_mem->dev); | |
213 | ||
214 | return ret; | |
215 | } | |
216 | ||
217 | static int qcom_rmtfs_mem_remove(struct platform_device *pdev) | |
218 | { | |
219 | struct qcom_rmtfs_mem *rmtfs_mem = dev_get_drvdata(&pdev->dev); | |
220 | ||
221 | cdev_device_del(&rmtfs_mem->cdev, &rmtfs_mem->dev); | |
222 | put_device(&rmtfs_mem->dev); | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
227 | static const struct of_device_id qcom_rmtfs_mem_of_match[] = { | |
228 | { .compatible = "qcom,rmtfs-mem" }, | |
229 | {} | |
230 | }; | |
231 | MODULE_DEVICE_TABLE(of, qcom_rmtfs_mem_of_match); | |
232 | ||
233 | static struct platform_driver qcom_rmtfs_mem_driver = { | |
234 | .probe = qcom_rmtfs_mem_probe, | |
235 | .remove = qcom_rmtfs_mem_remove, | |
236 | .driver = { | |
237 | .name = "qcom_rmtfs_mem", | |
238 | .of_match_table = qcom_rmtfs_mem_of_match, | |
239 | }, | |
240 | }; | |
241 | ||
242 | static int qcom_rmtfs_mem_init(void) | |
243 | { | |
244 | int ret; | |
245 | ||
246 | ret = alloc_chrdev_region(&qcom_rmtfs_mem_major, 0, | |
247 | QCOM_RMTFS_MEM_DEV_MAX, "qcom_rmtfs_mem"); | |
248 | if (ret < 0) { | |
249 | pr_err("qcom_rmtfs_mem: failed to allocate char dev region\n"); | |
250 | return ret; | |
251 | } | |
252 | ||
253 | ret = platform_driver_register(&qcom_rmtfs_mem_driver); | |
254 | if (ret < 0) { | |
255 | pr_err("qcom_rmtfs_mem: failed to register rmtfs_mem driver\n"); | |
256 | unregister_chrdev_region(qcom_rmtfs_mem_major, | |
257 | QCOM_RMTFS_MEM_DEV_MAX); | |
258 | } | |
259 | ||
260 | return ret; | |
261 | } | |
262 | module_init(qcom_rmtfs_mem_init); | |
263 | ||
264 | static void qcom_rmtfs_mem_exit(void) | |
265 | { | |
266 | platform_driver_unregister(&qcom_rmtfs_mem_driver); | |
267 | unregister_chrdev_region(qcom_rmtfs_mem_major, QCOM_RMTFS_MEM_DEV_MAX); | |
268 | } | |
269 | module_exit(qcom_rmtfs_mem_exit); | |
b18c9964 JC |
270 | |
271 | MODULE_AUTHOR("Linaro Ltd"); | |
272 | MODULE_DESCRIPTION("Qualcomm Remote Filesystem memory driver"); | |
273 | MODULE_LICENSE("GPL v2"); |