26 lines
718 B
C
26 lines
718 B
C
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/*
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* Copyright (c) 2017 Jean-Paul Etienne <fractalclone@gmail.com>
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* Copyright (c) 2017 Palmer Dabbelt <palmer@dabbelt.com>
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <init.h>
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#include "prci.h"
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/* Selects the 16MHz oscilator on the HiFive1 board, which provides a clock
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* that's accurate enough to actually drive serial ports off of.
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*/
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static int hifive1_clock_init(struct device *dev)
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{
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ARG_UNUSED(dev);
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PRCI_REG(PRCI_PLLCFG) = PLL_REFSEL(1) | PLL_BYPASS(1);
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PRCI_REG(PRCI_PLLDIV) = (PLL_FINAL_DIV_BY_1(1) | PLL_FINAL_DIV(0));
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PRCI_REG(PRCI_PLLCFG) |= PLL_SEL(1);
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PRCI_REG(PRCI_HFROSCCFG) &= ~ROSC_EN(1);
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return 0;
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}
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SYS_INIT(hifive1_clock_init, PRE_KERNEL_1, CONFIG_PINMUX_INIT_PRIORITY);
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