forked from Mirrors/opensbi
14dadeab09
Add missing SPDX and copyright information. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Copyright 2018 Canaan Inc.
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* Copyright (c) 2019 Western Digital Corporation or its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <sbi/riscv_encoding.h>
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#include "sysctl.h"
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volatile sysctl_t *const sysctl = (volatile sysctl_t *)SYSCTL_BASE_ADDR;
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#define SYSCTRL_CLOCK_FREQ_IN0 (26000000UL)
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static u32 sysctl_pll0_get_freq(void)
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{
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u32 freq_in, nr, nf, od;
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freq_in = SYSCTRL_CLOCK_FREQ_IN0;
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nr = sysctl->pll0.clkr0 + 1;
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nf = sysctl->pll0.clkf0 + 1;
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od = sysctl->pll0.clkod0 + 1;
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/*
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* Get final PLL output freq
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* FOUT = FIN / NR * NF / OD
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* = (FIN * NF) / (NR * OD)
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*/
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return ((u64)freq_in * (u64)nf) / ((u64)nr * (u64)od);
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}
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u32 sysctl_get_cpu_freq(void)
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{
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int clock_source;
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clock_source = (int)sysctl->clk_sel0.aclk_sel;
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switch (clock_source) {
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case 0:
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return SYSCTRL_CLOCK_FREQ_IN0;
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case 1:
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return sysctl_pll0_get_freq() /
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(2ULL << (int)sysctl->clk_sel0.aclk_divider_sel);
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default:
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return 0;
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}
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}
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