1 /* include/linux/android_pmem.h
2 *
3 * Copyright (C) 2007 Google, Inc.
4 *
5 * This software is licensed under the terms of the GNU General Public
6 * License version 2, as published by the Free Software Foundation, and
7 * may be copied, distributed, and modified under those terms.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 */
15
16 #ifndef _ANDROID_PMEM_H_
17 #define _ANDROID_PMEM_H_
18
19 #define PMEM_IOCTL_MAGIC 'p'
20 #define PMEM_GET_PHYS _IOW(PMEM_IOCTL_MAGIC, 1, unsigned int)
21 #define PMEM_MAP _IOW(PMEM_IOCTL_MAGIC, 2, unsigned int)
22 #define PMEM_GET_SIZE _IOW(PMEM_IOCTL_MAGIC, 3, unsigned int)
23 #define PMEM_UNMAP _IOW(PMEM_IOCTL_MAGIC, 4, unsigned int)
24 /* This ioctl will allocate pmem space, backing the file, it will fail
25 * if the file already has an allocation, pass it the len as the argument
26 * to the ioctl */
27 #define PMEM_ALLOCATE _IOW(PMEM_IOCTL_MAGIC, 5, unsigned int)
28 /* This will connect a one pmem file to another, pass the file that is already
29 * backed in memory as the argument to the ioctl
30 */
31 #define PMEM_CONNECT _IOW(PMEM_IOCTL_MAGIC, 6, unsigned int)
32 /* Returns the total size of the pmem region it is sent to as a pmem_region
33 * struct (with offset set to 0).
34 */
35 #define PMEM_GET_TOTAL_SIZE _IOW(PMEM_IOCTL_MAGIC, 7, unsigned int)
36 #define PMEM_CACHE_FLUSH _IOW(PMEM_IOCTL_MAGIC, 8, unsigned int)
37
38 struct android_pmem_platform_data
39 {
40 const char* name;
41 /* starting physical address of memory region */
42 unsigned long start;
43 /* size of memory region */
44 unsigned long size;
45 /* set to indicate the region should not be managed with an allocator */
46 unsigned no_allocator;
47 /* set to indicate maps of this region should be cached, if a mix of
48 * cached and uncached is desired, set this and open the device with
49 * O_SYNC to get an uncached region */
50 unsigned cached;
51 /* The MSM7k has bits to enable a write buffer in the bus controller*/
52 unsigned buffered;
53 };
54
55 struct pmem_region {
56 unsigned long offset;
57 unsigned long len;
58 };
59
60 #ifdef CONFIG_ANDROID_PMEM
61 int is_pmem_file(struct file *file);
62 int get_pmem_file(int fd, unsigned long *start, unsigned long *vstart,
63 unsigned long *end, struct file **filp);
64 int get_pmem_user_addr(struct file *file, unsigned long *start,
65 unsigned long *end);
66 void put_pmem_file(struct file* file);
67 void flush_pmem_file(struct file *file, unsigned long start, unsigned long len);
68 int pmem_setup(struct android_pmem_platform_data *pdata,
69 long (*ioctl)(struct file *, unsigned int, unsigned long),
70 int (*release)(struct inode *, struct file *));
71 int pmem_remap(struct pmem_region *region, struct file *file,
72 unsigned operation);
73
74 #else
is_pmem_file(struct file * file)75 static inline int is_pmem_file(struct file *file) { return 0; }
get_pmem_file(int fd,unsigned long * start,unsigned long * vstart,unsigned long * end,struct file ** filp)76 static inline int get_pmem_file(int fd, unsigned long *start,
77 unsigned long *vstart, unsigned long *end,
78 struct file **filp) { return -ENOSYS; }
get_pmem_user_addr(struct file * file,unsigned long * start,unsigned long * end)79 static inline int get_pmem_user_addr(struct file *file, unsigned long *start,
80 unsigned long *end) { return -ENOSYS; }
put_pmem_file(struct file * file)81 static inline void put_pmem_file(struct file* file) { return; }
flush_pmem_file(struct file * file,unsigned long start,unsigned long len)82 static inline void flush_pmem_file(struct file *file, unsigned long start,
83 unsigned long len) { return; }
pmem_setup(struct android_pmem_platform_data * pdata,long (* ioctl)(struct file *,unsigned int,unsigned long),int (* release)(struct inode *,struct file *))84 static inline int pmem_setup(struct android_pmem_platform_data *pdata,
85 long (*ioctl)(struct file *, unsigned int, unsigned long),
86 int (*release)(struct inode *, struct file *)) { return -ENOSYS; }
87
pmem_remap(struct pmem_region * region,struct file * file,unsigned operation)88 static inline int pmem_remap(struct pmem_region *region, struct file *file,
89 unsigned operation) { return -ENOSYS; }
90 #endif
91
92 #endif //_ANDROID_PPP_H_
93
94