/*
 * Register Definition API: field macros
 *
 * Copyright (c) 2016 Xilinx Inc.
 * Copyright (c) 2013 Peter Crosthwaite <peter.crosthwaite@xilinx.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 */

#ifndef REGISTERFIELDS_H
#define REGISTERFIELDS_H

/* Define constants for a 32 bit register */

/* This macro will define A_FOO, for the byte address of a register
 * as well as R_FOO for the uint32_t[] register number (A_FOO / 4).
 */
#define REG32(reg, addr)                                                  \
    enum { A_ ## reg = (addr) };                                          \
    enum { R_ ## reg = (addr) / 4 };

/* Define SHIFT, LENGTH and MASK constants for a field within a register */

/* This macro will define FOO_BAR_MASK, FOO_BAR_SHIFT and FOO_BAR_LENGTH 
 * constants for field BAR in register FOO.
 */
#define FIELD(reg, field, shift, length)                                  \
    enum { R_ ## reg ## _ ## field ## _SHIFT = (shift)};                  \
    enum { R_ ## reg ## _ ## field ## _LENGTH = (length)};                \
    enum { R_ ## reg ## _ ## field ## _MASK =                             \
                                        MAKE_64BIT_MASK(shift, length)};

/* Extract a field from a register */
#define FIELD_EX32(storage, reg, field)                                   \
    extract32((storage), R_ ## reg ## _ ## field ## _SHIFT,               \
              R_ ## reg ## _ ## field ## _LENGTH)

/* Extract a field from an array of registers */
#define ARRAY_FIELD_EX32(regs, reg, field)                                \
    FIELD_EX32((regs)[R_ ## reg], reg, field)

/* Deposit a register field.
 * Assigning values larger then the target field will result in
 * compilation warnings.
 */
#define FIELD_DP32(storage, reg, field, val) ({                           \
    struct {                                                              \
        unsigned int v:R_ ## reg ## _ ## field ## _LENGTH;                \
    } v = { .v = val };                                                   \
    uint32_t d;                                                           \
    d = deposit32((storage), R_ ## reg ## _ ## field ## _SHIFT,           \
                  R_ ## reg ## _ ## field ## _LENGTH, v.v);               \
    d; })

/* Deposit a field to array of registers.  */
#define ARRAY_FIELD_DP32(regs, reg, field, val)                           \
    (regs)[R_ ## reg] = FIELD_DP32((regs)[R_ ## reg], reg, field, val);

#endif