sound/pci/ctxfi/ctvmem.h

   1 /**
   2  * Copyright (C) 2008, Creative Technology Ltd. All Rights Reserved.
   3  *
   4  * This source file is released under GPL v2 license (no other versions).
   5  * See the COPYING file included in the main directory of this source
   6  * distribution for the license terms and conditions.
   7  *
   8  * @File    ctvmem.h
   9  *
  10  * @Brief
  11  * This file contains the definition of virtual memory management object
  12  * for card device.
  13  *
  14  * @Author Liu Chun
  15  * @Date Mar 28 2008
  16  */
  17
  18 #ifndef CTVMEM_H
  19 #define CTVMEM_H
  20
  21 #define CT_PTP_NUM      1       /* num of device page table pages */
  22
  23 #include <linux/mutex.h>
  24 #include <linux/list.h>
  25
  26 /* The chip can handle the page table of 4k pages
  27  * (emu20k1 can handle even 8k pages, but we don't use it right now)
  28  */
  29 #define CT_PAGE_SIZE    4096
  30 #define CT_PAGE_SHIFT   12
  31 #define CT_PAGE_MASK    (~(PAGE_SIZE - 1))
  32 #define CT_PAGE_ALIGN(addr)     ALIGN(addr, CT_PAGE_SIZE)
  33
  34 struct ct_vm_block {
  35         unsigned int addr;      /* starting logical addr of this block */
  36         unsigned int size;      /* size of this device virtual mem block */
  37         struct list_head list;
  38 };
  39
  40 struct snd_pcm_substream;
  41
  42 /* Virtual memory management object for card device */
  43 struct ct_vm {
  44         void *ptp[CT_PTP_NUM];          /* Device page table pages */
  45         unsigned int size;              /* Available addr space in bytes */
  46         struct list_head unused;        /* List of unused blocks */
  47         struct list_head used;          /* List of used blocks */
  48         struct mutex lock;
  49
  50         /* Map host addr (kmalloced/vmalloced) to device logical addr. */
  51         struct ct_vm_block *(*map)(struct ct_vm *, struct snd_pcm_substream *,
  52                                    int size);
  53         /* Unmap device logical addr area. */
  54         void (*unmap)(struct ct_vm *, struct ct_vm_block *block);
  55         void *(*get_ptp_virt)(struct ct_vm *vm, int index);
  56 };
  57
  58 int ct_vm_create(struct ct_vm **rvm);
  59 void ct_vm_destroy(struct ct_vm *vm);
  60
  61 #endif /* CTVMEM_H */