blob: 172644539032afc5fd66e36093be1df93e3bc52c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
/*
* include/asm-xtensa/dma.h
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2003 - 2005 Tensilica Inc.
*/
#ifndef _XTENSA_DMA_H
#define _XTENSA_DMA_H
#include <asm/io.h> /* need byte IO */
/*
* This is only to be defined if we have PC-like DMA.
* By default this is not true on an Xtensa processor,
* however on boards with a PCI bus, such functionality
* might be emulated externally.
*
* NOTE: there still exists driver code that assumes
* this is defined, eg. drivers/sound/soundcard.c (as of 2.4).
*/
#define MAX_DMA_CHANNELS 8
/*
* The maximum virtual address to which DMA transfers
* can be performed on this platform.
*
* NOTE: This is board (platform) specific, not processor-specific!
*
* NOTE: This assumes DMA transfers can only be performed on
* the section of physical memory contiguously mapped in virtual
* space for the kernel. For the Xtensa architecture, this
* means the maximum possible size of this DMA area is
* the size of the statically mapped kernel segment
* (XCHAL_KSEG_{CACHED,BYPASS}_SIZE), ie. 128 MB.
*
* NOTE: When the entire KSEG area is DMA capable, we subtract
* one from the max address so that the virt_to_phys() macro
* works correctly on the address (otherwise the address
* enters another area, and virt_to_phys() may not return
* the value desired).
*/
#ifndef MAX_DMA_ADDRESS
#define MAX_DMA_ADDRESS (PAGE_OFFSET + XCHAL_KIO_SIZE - 1)
#endif
/* Reserve and release a DMA channel */
extern int request_dma(unsigned int dmanr, const char * device_id);
extern void free_dma(unsigned int dmanr);
#endif
|
