include/linux/android_pmem.h

   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         const char *name;
  40         /* starting physical address of memory region */
  41         unsigned long start;
  42         /* size of memory region */
  43         unsigned long size;
  44         /* set to indicate the region should not be managed with an allocator */
  45         unsigned no_allocator;
  46         /* set to indicate maps of this region should be cached, if a mix of
  47          * cached and uncached is desired, set this and open the device with
  48          * O_SYNC to get an uncached region */
  49         unsigned cached;
  50         /* The MSM7k has bits to enable a write buffer in the bus controller */
  51         unsigned buffered;
  52 };
  53
  54 struct pmem_region {
  55         unsigned long offset;
  56         unsigned long len;
  57 };
  58
  59 #ifdef CONFIG_ANDROID_PMEM
  60 int is_pmem_file(struct file *file);
  61 int get_pmem_file(int fd, unsigned long *start, unsigned long *vstart,
  62                   unsigned long *end, struct file **filp);
  63 int get_pmem_user_addr(struct file *file, unsigned long *start, unsigned long *end);
  64 void put_pmem_file(struct file *file);
  65 void flush_pmem_file(struct file *file, unsigned long start, unsigned long len);
  66 int pmem_setup(struct android_pmem_platform_data *pdata,
  67                long (*ioctl) (struct file *, unsigned int, unsigned long),
  68                int (*release) (struct inode *, struct file *));
  69 int pmem_remap(struct pmem_region *region, struct file *file, unsigned operation);
  70
  71 #else
  72 static inline int is_pmem_file(struct file *file)
  73 {
  74         return 0;
  75 }
  76
  77 static inline int get_pmem_file(int fd, unsigned long *start,
  78                                 unsigned long *vstart, unsigned long *end, struct file **filp)
  79 {
  80         return -ENOSYS;
  81 }
  82
  83 static inline int get_pmem_user_addr(struct file *file, unsigned long *start, unsigned long *end)
  84 {
  85         return -ENOSYS;
  86 }
  87
  88 static inline void put_pmem_file(struct file *file)
  89 {
  90         return;
  91 }
  92
  93 static inline void flush_pmem_file(struct file *file, unsigned long start, unsigned long len)
  94 {
  95         return;
  96 }
  97
  98 static inline int pmem_setup(struct android_pmem_platform_data *pdata,
  99                              long (*ioctl) (struct file *, unsigned int, unsigned long),
 100                              int (*release) (struct inode *, struct file *))
 101 {
 102         return -ENOSYS;
 103 }
 104
 105 static inline int pmem_remap(struct pmem_region *region, struct file *file, unsigned operation)
 106 {
 107         return -ENOSYS;
 108 }
 109 #endif
 110
 111 #endif                          /* _ANDROID_PPP_H_ */