LXR uboot/arch/mips/mach-octeon/include/mach/cvmx-fuse.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * Copyright (C) 2020 Marvell International Ltd.
   4 */
   5
   6#ifndef __CVMX_FUSE_H__
   7#define __CVMX_FUSE_H__
   8
   9/**
  10 * Read a byte of fuse data
  11 * @param node          node to read from
  12 * @param byte_addr     address to read
  13 *
  14 * @return fuse value: 0 or 1
  15 */
  16static inline u8 cvmx_fuse_read_byte_node(u8 node, int byte_addr)
  17{
  18        u64 val;
  19
  20        val = FIELD_PREP(MIO_FUS_RCMD_ADDR, byte_addr) | MIO_FUS_RCMD_PEND;
  21        csr_wr_node(node, CVMX_MIO_FUS_RCMD, val);
  22
  23        do {
  24                val = csr_rd_node(node, CVMX_MIO_FUS_RCMD);
  25        } while (val & MIO_FUS_RCMD_PEND);
  26
  27        return FIELD_GET(MIO_FUS_RCMD_DAT, val);
  28}
  29
  30/**
  31 * Read a byte of fuse data
  32 * @param byte_addr   address to read
  33 *
  34 * @return fuse value: 0 or 1
  35 */
  36static inline u8 cvmx_fuse_read_byte(int byte_addr)
  37{
  38        return cvmx_fuse_read_byte_node(0, byte_addr);
  39}
  40
  41/**
  42 * Read a single fuse bit
  43 *
  44 * @param node   Node number
  45 * @param fuse   Fuse number (0-1024)
  46 *
  47 * @return fuse value: 0 or 1
  48 */
  49static inline int cvmx_fuse_read_node(u8 node, int fuse)
  50{
  51        return (cvmx_fuse_read_byte_node(node, fuse >> 3) >> (fuse & 0x7)) & 1;
  52}
  53
  54/**
  55 * Read a single fuse bit
  56 *
  57 * @param fuse   Fuse number (0-1024)
  58 *
  59 * @return fuse value: 0 or 1
  60 */
  61static inline int cvmx_fuse_read(int fuse)
  62{
  63        return cvmx_fuse_read_node(0, fuse);
  64}
  65
  66static inline int cvmx_octeon_fuse_locked(void)
  67{
  68        return cvmx_fuse_read(123);
  69}
  70
  71#endif /* __CVMX_FUSE_H__ */
  72