LXR linux/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
  34struct 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
  40struct snd_pcm_substream;
  41
  42/* Virtual memory management object for card device */
  43struct 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
  58int ct_vm_create(struct ct_vm **rvm);
  59void ct_vm_destroy(struct ct_vm *vm);
  60
  61#endif /* CTVMEM_H */
  62