/* * Registers for the ESS PCI cards */ /* * Memory access */ #define ESS_MEM_DATA 0x00 #define ESS_MEM_INDEX 0x02 /* * AC-97 Codec port. Delay 1uS after each write. This is used to * talk AC-97 (see intel.com). Write data then register. */ #define ESS_AC97_INDEX 0x30 /* byte wide */ #define ESS_AC97_DATA 0x32 /* * Reading is a bit different. You write register|0x80 to ubdex * delay 1uS poll the low bit of index, when it clears read the * data value. */ /* * Control port. Not yet fully understood * The value 0xC090 gets loaded to it then 0x0000 and 0x2800 * to the data port. Then after 4uS the value 0x300 is written */ #define RING_BUS_CTRL_L 0x34 #define RING_BUS_CTRL_H 0x36 /* * This is also used during setup. The value 0x17 is written to it */ #define ESS_SETUP_18 0x18 /* * And this one gets 0x000b */ #define ESS_SETUP_A2 0xA2 /* * And this 0x0000 */ #define ESS_SETUP_A4 0xA4 #define ESS_SETUP_A6 0xA6 /* * Stuff to do with Harpo - the wave stuff */ #define ESS_WAVETABLE_SIZE 0x14 #define ESS_WAVETABLE_2M 0xA180