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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020 Marvell International Ltd.
*
* Helper utilities for qlm_jtag.
*/
#ifndef __CVMX_HELPER_JTAG_H__
#define __CVMX_HELPER_JTAG_H__
/**
* The JTAG chain for CN52XX and CN56XX is 4 * 268 bits long, or 1072.
* CN5XXX full chain shift is:
* new data => lane 3 => lane 2 => lane 1 => lane 0 => data out
* The JTAG chain for CN63XX is 4 * 300 bits long, or 1200.
* The JTAG chain for CN68XX is 4 * 304 bits long, or 1216.
* The JTAG chain for CN66XX/CN61XX/CNF71XX is 4 * 304 bits long, or 1216.
* CN6XXX full chain shift is:
* new data => lane 0 => lane 1 => lane 2 => lane 3 => data out
* Shift LSB first, get LSB out
*/
extern const __cvmx_qlm_jtag_field_t __cvmx_qlm_jtag_field_cn63xx[];
extern const __cvmx_qlm_jtag_field_t __cvmx_qlm_jtag_field_cn66xx[];
extern const __cvmx_qlm_jtag_field_t __cvmx_qlm_jtag_field_cn68xx[];
#define CVMX_QLM_JTAG_UINT32 40
typedef u32 qlm_jtag_uint32_t[CVMX_QLM_JTAG_UINT32 * 8];
/**
* Initialize the internal QLM JTAG logic to allow programming
* of the JTAG chain by the cvmx_helper_qlm_jtag_*() functions.
* These functions should only be used at the direction of Cavium
* Networks. Programming incorrect values into the JTAG chain
* can cause chip damage.
*/
void cvmx_helper_qlm_jtag_init(void);
/**
* Write up to 32bits into the QLM jtag chain. Bits are shifted
* into the MSB and out the LSB, so you should shift in the low
* order bits followed by the high order bits. The JTAG chain for
* CN52XX and CN56XX is 4 * 268 bits long, or 1072. The JTAG chain
* for CN63XX is 4 * 300 bits long, or 1200.
*
* @param qlm QLM to shift value into
* @param bits Number of bits to shift in (1-32).
* @param data Data to shift in. Bit 0 enters the chain first, followed by
* bit 1, etc.
*
* @return The low order bits of the JTAG chain that shifted out of the
* circle.
*/
u32 cvmx_helper_qlm_jtag_shift(int qlm, int bits, u32 data);
/**
* Shift long sequences of zeros into the QLM JTAG chain. It is
* common to need to shift more than 32 bits of zeros into the
* chain. This function is a convience wrapper around
* cvmx_helper_qlm_jtag_shift() to shift more than 32 bits of
* zeros at a time.
*
* @param qlm QLM to shift zeros into
* @param bits
*/
void cvmx_helper_qlm_jtag_shift_zeros(int qlm, int bits);
/**
* Program the QLM JTAG chain into all lanes of the QLM. You must
* have already shifted in the proper number of bits into the
* JTAG chain. Updating invalid values can possibly cause chip damage.
*
* @param qlm QLM to program
*/
void cvmx_helper_qlm_jtag_update(int qlm);
/**
* Load the QLM JTAG chain with data from all lanes of the QLM.
*
* @param qlm QLM to program
*/
void cvmx_helper_qlm_jtag_capture(int qlm);
#endif /* __CVMX_HELPER_JTAG_H__ */
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