drivers/staging/dream/include/linux/android_pmem.h

   1 /* drivers/staging/dream/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 /* Revokes gpu registers and resets the gpu.  Pass a pointer to the
  37  * start of the mapped gpu regs (the vaddr returned by mmap) as the argument.
  38  */
  39 #define HW3D_REVOKE_GPU         _IOW(PMEM_IOCTL_MAGIC, 8, unsigned int)
  40 #define HW3D_GRANT_GPU          _IOW(PMEM_IOCTL_MAGIC, 9, unsigned int)
  41 #define HW3D_WAIT_FOR_INTERRUPT _IOW(PMEM_IOCTL_MAGIC, 10, unsigned int)
  42
  43 int get_pmem_file(int fd, unsigned long *start, unsigned long *vstart,
  44                   unsigned long *end, struct file **filp);
  45 int get_pmem_user_addr(struct file *file, unsigned long *start,
  46                        unsigned long *end);
  47 void put_pmem_file(struct file* file);
  48 void flush_pmem_file(struct file *file, unsigned long start, unsigned long len);
  49
  50 struct android_pmem_platform_data
  51 {
  52         const char* name;
  53         /* starting physical address of memory region */
  54         unsigned long start;
  55         /* size of memory region */
  56         unsigned long size;
  57         /* set to indicate the region should not be managed with an allocator */
  58         unsigned no_allocator;
  59         /* set to indicate maps of this region should be cached, if a mix of
  60          * cached and uncached is desired, set this and open the device with
  61          * O_SYNC to get an uncached region */
  62         unsigned cached;
  63         /* The MSM7k has bits to enable a write buffer in the bus controller*/
  64         unsigned buffered;
  65 };
  66
  67 struct pmem_region {
  68         unsigned long offset;
  69         unsigned long len;
  70 };
  71
  72 int pmem_setup(struct android_pmem_platform_data *pdata,
  73                long (*ioctl)(struct file *, unsigned int, unsigned long),
  74                int (*release)(struct inode *, struct file *));
  75
  76 int pmem_remap(struct pmem_region *region, struct file *file,
  77                unsigned operation);
  78
  79 #endif //_ANDROID_PPP_H_
  80