75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
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/*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Copyright (c) 2023 Nuvoton Technology Corporation.
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*/
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#define DT_DRV_COMPAT nuvoton_numaker_rst
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#include <zephyr/arch/cpu.h>
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#include <zephyr/device.h>
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#include <zephyr/devicetree.h>
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#include <zephyr/drivers/reset.h>
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/* Reset controller module IPRST offset */
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#define NUMAKER_RESET_IPRST0_OFFSET (8UL)
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#define NUMAKER_RESET_IP_OFFSET(id) (NUMAKER_RESET_IPRST0_OFFSET + (((id) >> 24UL) & 0xffUL))
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/* Reset controller module configuration bit */
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#define NUMAKER_RESET_IP_BIT(id) (id & 0x00ffffffUL)
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struct reset_numaker_config {
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uint32_t base;
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};
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static int reset_numaker_status(const struct device *dev, uint32_t id, uint8_t *status)
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{
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const struct reset_numaker_config *config = dev->config;
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*status = !!sys_test_bit(config->base + NUMAKER_RESET_IP_OFFSET(id),
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NUMAKER_RESET_IP_BIT(id));
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return 0;
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}
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static int reset_numaker_line_assert(const struct device *dev, uint32_t id)
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{
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const struct reset_numaker_config *config = dev->config;
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/* Generate reset signal to the corresponding module */
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sys_set_bit(config->base + NUMAKER_RESET_IP_OFFSET(id), NUMAKER_RESET_IP_BIT(id));
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return 0;
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}
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static int reset_numaker_line_deassert(const struct device *dev, uint32_t id)
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{
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const struct reset_numaker_config *config = dev->config;
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/* Release corresponding module from reset state */
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sys_clear_bit(config->base + NUMAKER_RESET_IP_OFFSET(id), NUMAKER_RESET_IP_BIT(id));
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return 0;
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}
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static int reset_numaker_line_toggle(const struct device *dev, uint32_t id)
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{
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(void)reset_numaker_line_assert(dev, id);
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(void)reset_numaker_line_deassert(dev, id);
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return 0;
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}
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static const struct reset_driver_api reset_numaker_driver_api = {
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.status = reset_numaker_status,
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.line_assert = reset_numaker_line_assert,
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.line_deassert = reset_numaker_line_deassert,
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.line_toggle = reset_numaker_line_toggle,
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};
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static const struct reset_numaker_config config = {
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.base = (uint32_t)DT_INST_REG_ADDR(0),
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};
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DEVICE_DT_INST_DEFINE(0, NULL, NULL, NULL, &config, PRE_KERNEL_1,
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CONFIG_RESET_INIT_PRIORITY, &reset_numaker_driver_api);
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