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 */ 62