44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
/*
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* Copyright (c) 2019 Interay Solutions B.V.
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* Copyright (c) 2019 Oane Kingma
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* Copyright (c) 2020 Thorvald Natvig
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/init.h>
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#include <zephyr/drivers/gpio.h>
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#include <zephyr/sys/printk.h>
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#include "em_cmu.h"
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#include "board.h"
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static int efm32gg_slwstk6121a_init(const struct device *dev)
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{
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ARG_UNUSED(dev);
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const struct device *cur_dev;
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/* Configure ethernet reference clock */
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cur_dev = DEVICE_DT_GET(ETH_REF_CLK_GPIO_NODE);
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if (!device_is_ready(cur_dev)) {
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printk("Ethernet reference clock gpio port is not ready!\n");
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return -ENODEV;
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}
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gpio_pin_configure(cur_dev, ETH_REF_CLK_GPIO_PIN, GPIO_OUTPUT);
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gpio_pin_set(cur_dev, ETH_REF_CLK_GPIO_PIN, 0);
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CMU_OscillatorEnable(cmuOsc_HFXO, true, true);
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/* enable CMU_CLK2 as RMII reference clock */
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CMU->CTRL |= CMU_CTRL_CLKOUTSEL2_HFXO;
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CMU->ROUTELOC0 = (CMU->ROUTELOC0 & ~_CMU_ROUTELOC0_CLKOUT2LOC_MASK) |
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(ETH_REF_CLK_LOCATION << _CMU_ROUTELOC0_CLKOUT2LOC_SHIFT);
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CMU->ROUTEPEN |= CMU_ROUTEPEN_CLKOUT2PEN;
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return 0;
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}
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/* needs to be done after GPIO driver init and device tree available */
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SYS_INIT(efm32gg_slwstk6121a_init, POST_KERNEL, CONFIG_KERNEL_INIT_PRIORITY_DEVICE);
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