tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Registers for the ESS PCI cards
3 */
4
5/*
6 * Memory access
7 */
8
9#define ESS_MEM_DATA 0x00
10#define ESS_MEM_INDEX 0x02
11
12/*
13 * AC-97 Codec port. Delay 1uS after each write. This is used to
14 * talk AC-97 (see intel.com). Write data then register.
15 */
16
17#define ESS_AC97_INDEX 0x30 /* byte wide */
18#define ESS_AC97_DATA 0x32
19
20/*
21 * Reading is a bit different. You write register|0x80 to ubdex
22 * delay 1uS poll the low bit of index, when it clears read the
23 * data value.
24 */
25
26/*
27 * Control port. Not yet fully understood
28 * The value 0xC090 gets loaded to it then 0x0000 and 0x2800
29 * to the data port. Then after 4uS the value 0x300 is written
30 */
31
32#define RING_BUS_CTRL_L 0x34
33#define RING_BUS_CTRL_H 0x36
34
35/*
36 * This is also used during setup. The value 0x17 is written to it
37 */
38
39#define ESS_SETUP_18 0x18
40
41/*
42 * And this one gets 0x000b
43 */
44
45#define ESS_SETUP_A2 0xA2
46
47/*
48 * And this 0x0000
49 */
50
51#define ESS_SETUP_A4 0xA4
52#define ESS_SETUP_A6 0xA6
53
54/*
55 * Stuff to do with Harpo - the wave stuff
56 */
57
58#define ESS_WAVETABLE_SIZE 0x14
59#define ESS_WAVETABLE_2M 0xA180
60