1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 2020 Marvell International Ltd.
6 #ifndef __CVMX_FUSE_H__
7 #define __CVMX_FUSE_H__
10 * Read a byte of fuse data
11 * @param node node to read from
12 * @param byte_addr address to read
14 * Return: fuse value: 0 or 1
16 static inline u8 cvmx_fuse_read_byte_node(u8 node, int byte_addr)
20 val = FIELD_PREP(MIO_FUS_RCMD_ADDR, byte_addr) | MIO_FUS_RCMD_PEND;
21 csr_wr_node(node, CVMX_MIO_FUS_RCMD, val);
24 val = csr_rd_node(node, CVMX_MIO_FUS_RCMD);
25 } while (val & MIO_FUS_RCMD_PEND);
27 return FIELD_GET(MIO_FUS_RCMD_DAT, val);
31 * Read a byte of fuse data
32 * @param byte_addr address to read
34 * Return: fuse value: 0 or 1
36 static inline u8 cvmx_fuse_read_byte(int byte_addr)
38 return cvmx_fuse_read_byte_node(0, byte_addr);
42 * Read a single fuse bit
44 * @param node Node number
45 * @param fuse Fuse number (0-1024)
47 * Return: fuse value: 0 or 1
49 static inline int cvmx_fuse_read_node(u8 node, int fuse)
51 return (cvmx_fuse_read_byte_node(node, fuse >> 3) >> (fuse & 0x7)) & 1;
55 * Read a single fuse bit
57 * @param fuse Fuse number (0-1024)
59 * Return: fuse value: 0 or 1
61 static inline int cvmx_fuse_read(int fuse)
63 return cvmx_fuse_read_node(0, fuse);
66 static inline int cvmx_octeon_fuse_locked(void)
68 return cvmx_fuse_read(123);
71 #endif /* __CVMX_FUSE_H__ */