1 /*
2 * ohare.h: definitions for using the "O'Hare" I/O controller chip.
3 *
4 * Copyright (C) 1997 Paul Mackerras.
5 *
6 * BenH: Changed to match those of heathrow (but not all of them). Please
7 * check if I didn't break anything (especially the media bay).
8 */
9
10 /* offset from ohare base for feature control register */
11 #define OHARE_FEATURE_REG 0x38
12
13 /*
14 * Bits in feature control register.
15 * These were mostly derived by experiment on a powerbook 3400
16 * and may differ for other machines.
17 */
18 #define OH_SCC_RESET 1
19 #define OH_BAY_POWER_N 2 /* a guess */
20 #define OH_BAY_PCI_ENABLE 4 /* a guess */
21 #define OH_BAY_IDE_ENABLE 8
22 #define OH_BAY_FLOPPY_ENABLE 0x10
23 #define OH_IDE0_ENABLE 0x20
24 #define OH_IDE0_RESET_N 0x40 /* a guess */
25 #define OH_BAY_RESET_N 0x80
26 #define OH_IOBUS_ENABLE 0x100 /* IOBUS seems to be IDE */
27 #define OH_SCC_ENABLE 0x200
28 #define OH_MESH_ENABLE 0x400
29 #define OH_FLOPPY_ENABLE 0x800
30 #define OH_SCCA_IO 0x4000
31 #define OH_SCCB_IO 0x8000
32 #define OH_VIA_ENABLE 0x10000 /* Is apparently wrong, to be verified */
33 #define OH_IDE1_RESET_N 0x800000
34
35 /*
36 * Bits to set in the feature control register on PowerBooks.
37 */
38 #define PBOOK_FEATURES (OH_IDE_ENABLE | OH_SCC_ENABLE | \
39 OH_MESH_ENABLE | OH_SCCA_IO | OH_SCCB_IO)
40
41 /*
42 * A magic value to put into the feature control register of the
43 * "ohare" I/O controller on Starmaxes to enable the IDE CD interface.
44 * Contributed by Harry Eaton.
45 */
46 #define STARMAX_FEATURES 0xbeff7a
47
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