coreboot-kgpe-d16/src/soc/cavium/cn81xx/clock.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright 2018       Facebook, Inc.
 * Copyright 2003-2017  Cavium Inc.  <support@cavium.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
#include <soc/clock.h>
#include <arch/io.h>
#include <soc/addressmap.h>

#define PLL_REF_CLK	50000000	/* 50 MHz */

union cavm_rst_boot {
	u64 u;
	struct {
		u64 rboot_pin:1;
		u64 rboot:1;
		u64 lboot:10;
		u64 lboot_ext23:6;
		u64 lboot_ext45:6;
		u64 reserved_24_29:6;
		u64 lboot_oci:3;
		u64 pnr_mul:6;
		u64 reserved_39_39:1;
		u64 c_mul:7;
		u64 reserved_47_54:8;
		u64 dis_scan:1;
		u64 dis_huk:1;
		u64 vrm_err:1;
		u64 jt_tstmode:1;
		u64 ckill_ppdis:1;
		u64 trusted_mode:1;
		u64 ejtagdis:1;
		u64 jtcsrdis:1;
		u64 chipkill:1;
	} s;
};

/**
 * Returns the reference clock speed in Hz
 */
u64 thunderx_get_ref_clock(void)
{
	return PLL_REF_CLK;
}


/**
 * Returns the I/O clock speed in Hz
 */
u64 thunderx_get_io_clock(void)
{
	union cavm_rst_boot rst_boot;

	rst_boot.u = read64((void *)RST_PF_BAR0);

	return ((u64)rst_boot.s.pnr_mul) * PLL_REF_CLK;
}

/**
 * Returns the core clock speed in Hz
 */
u64 thunderx_get_core_clock(void)
{
	union cavm_rst_boot rst_boot;

	rst_boot.u = read64((void *)RST_PF_BAR0);

	return ((u64)rst_boot.s.c_mul) * PLL_REF_CLK;
}