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#include <linux/pci.h> 26#include <sound/memalloc.h> 27 28/* The chip can handle the page table of 4k pages 29 * (emu20k1 can handle even 8k pages, but we don't use it right now) 30 */ 31#define CT_PAGE_SIZE 4096 32#define CT_PAGE_SHIFT 12 33#define CT_PAGE_MASK (~(PAGE_SIZE - 1)) 34#define CT_PAGE_ALIGN(addr) ALIGN(addr, CT_PAGE_SIZE) 35 36struct ct_vm_block { 37 unsigned int addr; /* starting logical addr of this block */ 38 unsigned int size; /* size of this device virtual mem block */ 39 struct list_head list; 40}; 41 42struct snd_pcm_substream; 43 44/* Virtual memory management object for card device */ 45struct ct_vm { 46 struct snd_dma_buffer ptp[CT_PTP_NUM]; /* Device page table pages */ 47 unsigned int size; /* Available addr space in bytes */ 48 struct list_head unused; /* List of unused blocks */ 49 struct list_head used; /* List of used blocks */ 50 struct mutex lock; 51 52 /* Map host addr (kmalloced/vmalloced) to device logical addr. */ 53 struct ct_vm_block *(*map)(struct ct_vm *, struct snd_pcm_substream *, 54 int size); 55 /* Unmap device logical addr area. */ 56 void (*unmap)(struct ct_vm *, struct ct_vm_block *block); 57 dma_addr_t (*get_ptp_phys)(struct ct_vm *vm, int index); 58}; 59 60int ct_vm_create(struct ct_vm **rvm, struct pci_dev *pci); 61void ct_vm_destroy(struct ct_vm *vm); 62 63#endif /* CTVMEM_H */ 64