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 | |