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/**
* Copyright (C) 2008, Creative Technology Ltd. All Rights Reserved.
*
* This source file is released under GPL v2 license (no other versions).
* See the COPYING file included in the main directory of this source
* distribution for the license terms and conditions.
*
* @File ctvmem.h
*
* @Brief
* This file contains the definition of virtual memory management object
* for card device.
*
* @Author Liu Chun
* @Date Mar 28 2008
*/
#ifndef CTVMEM_H
#define CTVMEM_H
#define CT_PTP_NUM 1 /* num of device page table pages */
#include <linux/mutex.h>
#include <linux/list.h>
/* The chip can handle the page table of 4k pages
* (emu20k1 can handle even 8k pages, but we don't use it right now)
*/
#define CT_PAGE_SIZE 4096
#define CT_PAGE_SHIFT 12
#define CT_PAGE_MASK (~(PAGE_SIZE - 1))
#define CT_PAGE_ALIGN(addr) ALIGN(addr, CT_PAGE_SIZE)
struct ct_vm_block {
unsigned int addr; /* starting logical addr of this block */
unsigned int size; /* size of this device virtual mem block */
struct list_head list;
};
struct snd_pcm_substream;
/* Virtual memory management object for card device */
struct ct_vm {
void *ptp[CT_PTP_NUM]; /* Device page table pages */
unsigned int size; /* Available addr space in bytes */
struct list_head unused; /* List of unused blocks */
struct list_head used; /* List of used blocks */
struct mutex lock;
/* Map host addr (kmalloced/vmalloced) to device logical addr. */
struct ct_vm_block *(*map)(struct ct_vm *, struct snd_pcm_substream *,
int size);
/* Unmap device logical addr area. */
void (*unmap)(struct ct_vm *, struct ct_vm_block *block);
void *(*get_ptp_virt)(struct ct_vm *vm, int index);
};
int ct_vm_create(struct ct_vm **rvm);
void ct_vm_destroy(struct ct_vm *vm);
#endif /* CTVMEM_H */
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