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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 1.0 (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: * Copyright 1998 by Apple Computer, Inc., All rights reserved.
26: *
27: * Intel PIIX/PIIX3/PIIX4 PCI IDE controller timing tables.
28: *
29: * HISTORY:
30: * 1-Feb-1998 Joe Liu at Apple
31: * Created.
32: */
33: #import "PIIX.h"
34:
35: typedef ideTransferType_t PIIXTransferType_t;
36:
37: /*
38: * PIIX PIO/DMA timing table.
39: */
40:
41: typedef struct {
42: u_char pio_mode;
43: u_char swdma_mode;
44: u_char mwdma_mode;
45: u_char isp; // IORDY sample point in PCI clocks
46: u_char rct; // Recovery time in PCI clocks
47: u_short cycle; // cycle time in ns
48: } PIIXTiming;
49:
50: #define INV 255 // invalid mode
51: #define PIIX_TIMING_TABLE_SIZE 6
52:
53: static const
54: PIIXTiming PIIXTimingTable[] = {
55: // PIO SW MW
56: {0, 0, 0, 5, 4, 600}, // compatible timing
57: {1, 1, INV, 5, 4, 600},
58: {2, 2, INV, 4, 4, 240},
59: {3, INV, 1, 3, 3, 180},
60: {4, INV, 2, 3, 1, 120},
61: {5, INV, 2, 3, 1, 120}, // Isn't this 90ns?
62: };
63:
64: /*
65: * PIIX Ultra DMA/33 timing table.
66: */
67: typedef struct {
68: u_char mode;
69: u_char ct; // Cycle time in PCI clocks
70: u_char rp; // Ready to Pause time in PCI clocks
71: u_char bits; // bit settings
72: u_short strobe; // strobe period in ns
73: } PIIXUltraDMATiming;
74:
75: static const
76: PIIXUltraDMATiming PIIXUltraDMATimingTable[] = {
77: {0, 4, 6, 0, 120},
78: {1, 3, 5, 1, 90},
79: {2, 2, 4, 2, 60},
80: };
81:
82: /*
83: * Given a transfer mode/type, return the index for the
84: * entry in PIIXTimingTable[] which matches the mode.
85: */
86: static __inline__
87: u_char
88: PIIXFindModeInTable(u_char mode, PIIXTransferType_t type)
89: {
90: int i;
91: for (i = (PIIX_TIMING_TABLE_SIZE - 1); i >= 0; i--) {
92: u_char m;
93:
94: switch (type) {
95: case IDE_TRANSFER_ULTRA_DMA:
96: case IDE_TRANSFER_MW_DMA:
97: m = PIIXTimingTable[i].mwdma_mode;
98: break;
99: case IDE_TRANSFER_SW_DMA:
100: m = PIIXTimingTable[i].swdma_mode;
101: break;
102: case IDE_TRANSFER_PIO:
103: default:
104: m = PIIXTimingTable[i].pio_mode;
105: }
106:
107: if (mode == m)
108: return (i);
109: }
110:
111: // not found, return compatible timing
112: return (0);
113: }
114:
115: /*
116: * Given a transfer mode/type, return the ISP value.
117: */
118: static __inline__
119: u_char
120: PIIXGetISPForMode(u_char mode, PIIXTransferType_t type)
121: {
122: u_char index = PIIXFindModeInTable(mode, type);
123: return (PIIX_CLK_TO_ISP(PIIXTimingTable[index].isp));
124: }
125:
126: /*
127: * Given a transfer mode/type, return the RCT value.
128: */
129: static __inline__
130: u_char
131: PIIXGetRCTForMode(u_char mode, PIIXTransferType_t type)
132: {
133: u_char index = PIIXFindModeInTable(mode, type);
134: return (PIIX_CLK_TO_RCT(PIIXTimingTable[index].rct));
135: }
136:
137: /*
138: * Given a transfer mode/type, return the cycle time in ns.
139: */
140: static __inline__
141: u_short
142: PIIXGetCycleForMode(u_char mode, PIIXTransferType_t type)
143: {
144: u_char index = PIIXFindModeInTable(mode, type);
145: return (PIIXTimingTable[index].cycle);
146: }
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