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 75 static inline int is_pmem_file(struct file *file) { return 0; } 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; } 79 static inline int get_pmem_user_addr(struct file *file, unsigned long *start, 80 unsigned long *end) { return -ENOSYS; } 81 static inline void put_pmem_file(struct file* file) { return; } 82 static inline void flush_pmem_file(struct file *file, unsigned long start, 83 unsigned long len) { return; } 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 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
