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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /*
26: * Copyright (c) 1992 NeXT Computer, Inc.
27: *
28: * dma_exported.h -- DMA external interface.
29: *
30: * HISTORY
31: *
32: * 08 Jan 1993 David Somayajulu at NeXT
33: * added functions is_dma_done, get_dma_addr, get_dma_count
34: *
35: * 14 July 1992 ? at NeXT
36: * Created.
37: */
38:
39: #import <mach/mach_types.h>
40:
41: #define DMA_BUF_SM_LEN PAGE_SIZE
42: #define DMA_BUF_LG_LEN (64*1024)
43:
44: typedef struct dma_buf {
45: void *_ptr; /* opaque region ptr */
46: void *_type; /* opaque buffer type */
47: } dma_buf_t;
48:
49: typedef struct dma_xfer {
50: vm_offset_t phys; /* phys address of data to transfer */
51: vm_size_t len; /* length of transfer */
52: int chan; /* core dma channel number */
53: dma_buf_t buf; /* optional dma buffer */
54: unsigned int active :1, /* xfer is in progress */
55: buffered:1, /* xfer is using dma buffer */
56: use_chan:1, /* xfer uses core dma channel */
57: read :1, /* read or write xfer */
58: lower16 :1, /* dma restricted to lower 16 meg */
59: bound64 :1, /* dma cannot cross 64 k boundary */
60: :0;
61: } dma_xfer_t;
62:
63: // Core initialization
64: void dma_initialize(
65: void);
66:
67: // Channel manipulation
68: boolean_t dma_assign_chan(
69: int chan);
70: void dma_deassign_chan(
71: int chan);
72: void dma_mask_chan(
73: int chan);
74: void dma_unmask_chan(
75: int chan);
76: void dma_chan_xfer_mode(
77: int chan,
78: int xfer_mode);
79: void dma_chan_autoinit(
80: int chan,
81: boolean_t autoinit);
82: void dma_chan_adrs_dir(
83: int chan,
84: boolean_t adrs_dir);
85:
86: // Transfer operations
87: boolean_t dma_xfer_chan(
88: int chan,
89: dma_xfer_t *xfer);
90: boolean_t dma_xfer(
91: dma_xfer_t *xfer,
92: vm_offset_t *rphys);
93: void dma_xfer_done(
94: dma_xfer_t *xfer);
95: void dma_xfer_abort(
96: dma_xfer_t *xfer);
97:
98: // Extended Mode register manipulation
99: void dma_xfer_width(
100: int chan,
101: int xfer_width);
102: void dma_timing(
103: int chan,
104: int dma_timing);
105: void dma_eop_in(
106: int chan,
107: int eop_io);
108: void dma_stop_enable(
109: int chan,
110: int stop_enable);
111:
112: // Buffer operations
113: boolean_t dma_buf_alloc(
114: dma_buf_t *buf,
115: vm_size_t len);
116: void dma_buf_free(
117: dma_buf_t *buf);
118:
119: // Status checks
120:
121: boolean_t is_dma_done(int chan );
122:
123: vm_offset_t get_dma_addr( int chan);
124: vm_size_t get_dma_count(int chan);
125:
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