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 */