/*
 * Author: Dave Plummer (davepl@davepl.com)
 * (c) 2026 Plummer's Software LLC
 * Contributed under the GPL2 License
 */
#ifndef _DEQNA_REGS_H_
#define _DEQNA_REGS_H_

#include <stdint.h>

// Register indices (word offsets from CSR base)
#define DEQNA_REG_STA0        0
#define DEQNA_REG_STA1        1
#define DEQNA_REG_RCVLIST_LO  2
#define DEQNA_REG_RCVLIST_HI  3
#define DEQNA_REG_XMTLIST_LO  4
#define DEQNA_REG_XMTLIST_HI  5
#define DEQNA_REG_VECTOR      6
#define DEQNA_REG_CSR         7

// CSR bits (DEQNA)
#define QE_RCV_ENABLE   0x0001
#define QE_RESET        0x0002
#define QE_NEX_MEM_INT  0x0004
#define QE_LOAD_ROM     0x0008
#define QE_XL_INVALID   0x0010
#define QE_RL_INVALID   0x0020
#define QE_INT_ENABLE   0x0040
#define QE_XMIT_INT     0x0080
#define QE_ILOOP        0x0100
#define QE_ELOOP        0x0200
#define QE_STIM_ENABLE  0x0400
#define QE_OK           0x1000
#define QE_CARRIER      0x2000
#define QE_PARITY       0x4000
#define QE_RCV_INT      0x8000

#define QE_CSR_RO       0xF8B4
#define QE_CSR_RW       0x074B
#define QE_CSR_W1       0x8080
#define QE_CSR_BP       0x0208

// Vector register bits
#define QE_VEC_MS       0x8000
#define QE_VEC_OS       0x4000
#define QE_VEC_RS       0x2000
#define QE_VEC_S3       0x1000
#define QE_VEC_S2       0x0800
#define QE_VEC_S1       0x0400
#define QE_VEC_ST       0x1C00
#define QE_VEC_IV       0x03FC
#define QE_VEC_RR       0x0002
#define QE_VEC_ID       0x0001
#define QE_VEC_RO       0x5C02
#define QE_VEC_RW       0xA3FD

// Descriptor format
#define QE_RING_WORDS 6
#define QE_RING_BYTES (QE_RING_WORDS * 2)

#define QE_RING_ADDR_HI_MASK 0x003f
#define QE_RING_ODD_BEGIN    0x0040
#define QE_RING_ODD_END      0x0080
#define QE_RING_EOMSG        0x2000
#define QE_RING_SETUP        0x1000
#define QE_RING_CHAIN        0x4000
#define QE_RING_VALID        0x8000

// Receive status word 1 values (DEQNA)
#define QE_RST_UNUSED    0x8000  // Unused buffer
#define QE_RST_LASTNOT   0xC000  // Used, not last segment
#define QE_RST_LASTERR   0x4000  // Used, last segment with errors
#define QE_RST_LASTNOERR 0x0000  // Used, last segment without errors
#define QE_RST_RSVD      0x00f8

#define QE_OVF        0x0001
#define QE_CRCERR     0x0002
#define QE_FRAME      0x0004
#define QE_SHORT      0x0008
#define QE_RBL_HI     0x0700
#define QE_RUNT       0x0800
#define QE_DISCARD    0x1000
#define QE_ESETUP     0x2000
#define QE_ERROR      0x4000
#define QE_LASTNOT    QE_RST_LASTNOT

#define QE_RBL_LO     0x00ff

// Transmit status bits
#define QE_CCNT       0x00f0
#define QE_FAIL       0x0100
#define QE_ABORT      0x0200
#define QE_STE16      0x0400
#define QE_NOCAR      0x0800
#define QE_LOSS       0x1000
#define QE_TDR        0x3fff

// Descriptor ownership
#define QE_NOTYET     0x8000
#define QE_INUSE      0x4000
// Maximum number of MAC address filters
#define QNA_FILTER_MAX 14

#endif // _DEQNA_REGS_H_