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/*

 *      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