1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2008, Creative Technology Ltd. All Rights Reserved. 4 * 5 * @File ctvmem.h 6 * 7 * @Brief 8 * This file contains the definition of virtual memory management object 9 * for card device. 10 * 11 * @Author Liu Chun 12 * @Date Mar 28 2008 13 */ 14 15 #ifndef CTVMEM_H 16 #define CTVMEM_H 17 18 #define CT_PTP_NUM 4 /* num of device page table pages */ 19 20 #include <linux/mutex.h> 21 #include <linux/list.h> 22 #include <linux/pci.h> 23 #include <sound/memalloc.h> 24 25 /* The chip can handle the page table of 4k pages 26 * (emu20k1 can handle even 8k pages, but we don't use it right now) 27 */ 28 #define CT_PAGE_SIZE 4096 29 #define CT_PAGE_SHIFT 12 30 #define CT_PAGE_MASK (~(PAGE_SIZE - 1)) 31 #define CT_PAGE_ALIGN(addr) ALIGN(addr, CT_PAGE_SIZE) 32 33 struct ct_vm_block { 34 unsigned int addr; /* starting logical addr of this block */ 35 unsigned int size; /* size of this device virtual mem block */ 36 struct list_head list; 37 }; 38 39 struct snd_pcm_substream; 40 41 /* Virtual memory management object for card device */ 42 struct ct_vm { 43 struct snd_dma_buffer ptp[CT_PTP_NUM]; /* Device page table pages */ 44 unsigned int size; /* Available addr space in bytes */ 45 struct list_head unused; /* List of unused blocks */ 46 struct list_head used; /* List of used blocks */ 47 struct mutex lock; 48 49 /* Map host addr (kmalloced/vmalloced) to device logical addr. */ 50 struct ct_vm_block *(*map)(struct ct_vm *, struct snd_pcm_substream *, 51 int size); 52 /* Unmap device logical addr area. */ 53 void (*unmap)(struct ct_vm *, struct ct_vm_block *block); 54 dma_addr_t (*get_ptp_phys)(struct ct_vm *vm, int index); 55 }; 56 57 int ct_vm_create(struct ct_vm **rvm, struct pci_dev *pci); 58 void ct_vm_destroy(struct ct_vm *vm); 59 60 #endif /* CTVMEM_H */ 61