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 38struct 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 55struct pmem_region { 56 unsigned long offset; 57 unsigned long len; 58}; 59 60#ifdef CONFIG_ANDROID_PMEM 61int is_pmem_file(struct file *file); 62int get_pmem_file(int fd, unsigned long *start, unsigned long *vstart, 63 unsigned long *end, struct file **filp); 64int get_pmem_user_addr(struct file *file, unsigned long *start, 65 unsigned long *end); 66void put_pmem_file(struct file* file); 67void flush_pmem_file(struct file *file, unsigned long start, unsigned long len); 68int pmem_setup(struct android_pmem_platform_data *pdata, 69 long (*ioctl)(struct file *, unsigned int, unsigned long), 70 int (*release)(struct inode *, struct file *)); 71int pmem_remap(struct pmem_region *region, struct file *file, 72 unsigned operation); 73 74#else 75static inline int is_pmem_file(struct file *file) { return 0; } 76static inline int get_pmem_file(int fd, unsigned long *start, 77 unsigned long *vstart, unsigned long *end, 78 struct file **filp) { return -ENOSYS; } 79static inline int get_pmem_user_addr(struct file *file, unsigned long *start, 80 unsigned long *end) { return -ENOSYS; } 81static inline void put_pmem_file(struct file* file) { return; } 82static inline void flush_pmem_file(struct file *file, unsigned long start, 83 unsigned long len) { return; } 84static 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 88static 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