81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
/*
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* Copyright (c) 2020 Henrik Brix Andersen <henrik@brixandersen.dk>
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <cmsis_core.h>
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#include <zephyr/device.h>
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#include <zephyr/devicetree.h>
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#include <zephyr/drivers/gpio.h>
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#include <zephyr/init.h>
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(board, CONFIG_LOG_DEFAULT_LEVEL);
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#include "board.h"
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#define DAPLINK_QSPI_MUX_NODE DT_NODELABEL(daplink_qspi_mux)
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#if DT_NODE_HAS_STATUS(DAPLINK_QSPI_MUX_NODE, okay)
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int board_daplink_qspi_mux_select(enum board_daplink_qspi_mux_mode mode)
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{
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struct gpio_dt_spec mux = GPIO_DT_SPEC_GET(DAPLINK_QSPI_MUX_NODE, mux_gpios);
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gpio_flags_t flags = 0;
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int err;
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switch (mode) {
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case BOARD_DAPLINK_QSPI_MUX_MODE_XIP:
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flags = GPIO_OUTPUT_LOW;
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break;
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case BOARD_DAPLINK_QSPI_MUX_MODE_NORMAL:
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flags = GPIO_OUTPUT_HIGH;
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break;
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default:
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__ASSERT(0, "invalid mode");
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return -EINVAL;
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}
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if (!gpio_is_ready_dt(&mux)) {
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LOG_ERR("DAPLink QSPI MUX GPIO device not ready");
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return -EINVAL;
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}
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err = gpio_pin_configure_dt(&mux, flags);
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if (err) {
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LOG_ERR("failed to configure DAPLink QSPI MUX GPIO (err %d)",
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err);
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return err;
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}
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return 0;
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}
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bool board_daplink_is_fitted(void)
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{
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/*
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* The DAPLINK_fitted_n signal is routed to an IRQ line. It is used as a
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* level-detect non-interrupt signal to determine if the DAPLink shield
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* is fitted.
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*/
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return !NVIC_GetPendingIRQ(DT_IRQN(DAPLINK_QSPI_MUX_NODE));
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}
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static int board_init(void)
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{
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/*
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* Automatically select normal mode unless the DAPLink shield is fitted
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* in which case the CPU will have the off-board QSPI NOR flash
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* memory-mapped at 0x0.
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*/
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if (!board_daplink_is_fitted()) {
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board_daplink_qspi_mux_select(
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BOARD_DAPLINK_QSPI_MUX_MODE_NORMAL);
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}
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return 0;
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}
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SYS_INIT(board_init, POST_KERNEL, CONFIG_BOARD_INIT_PRIORITY);
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#endif /* DT_NODE_HAS_STATUS(DAPLINK_QSPI_MUX_NODE, okay) */
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