1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
61 lines
1.1 KiB
C
61 lines
1.1 KiB
C
/*
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* Registers for the ESS PCI cards
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*/
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/*
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* Memory access
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*/
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#define ESS_MEM_DATA 0x00
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#define ESS_MEM_INDEX 0x02
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/*
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* AC-97 Codec port. Delay 1uS after each write. This is used to
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* talk AC-97 (see intel.com). Write data then register.
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*/
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#define ESS_AC97_INDEX 0x30 /* byte wide */
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#define ESS_AC97_DATA 0x32
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/*
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* Reading is a bit different. You write register|0x80 to ubdex
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* delay 1uS poll the low bit of index, when it clears read the
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* data value.
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*/
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/*
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* Control port. Not yet fully understood
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* The value 0xC090 gets loaded to it then 0x0000 and 0x2800
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* to the data port. Then after 4uS the value 0x300 is written
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*/
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#define RING_BUS_CTRL_L 0x34
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#define RING_BUS_CTRL_H 0x36
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/*
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* This is also used during setup. The value 0x17 is written to it
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*/
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#define ESS_SETUP_18 0x18
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/*
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* And this one gets 0x000b
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*/
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#define ESS_SETUP_A2 0xA2
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/*
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* And this 0x0000
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*/
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#define ESS_SETUP_A4 0xA4
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#define ESS_SETUP_A6 0xA6
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/*
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* Stuff to do with Harpo - the wave stuff
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*/
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#define ESS_WAVETABLE_SIZE 0x14
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#define ESS_WAVETABLE_2M 0xA180
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