100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
/*
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* Copyright (c) 2021 Google Inc
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT nuvoton_npcx_bbram
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#include <zephyr/drivers/bbram.h>
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#include <errno.h>
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#include <zephyr/sys/util.h>
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(npcx_bbram, CONFIG_BBRAM_LOG_LEVEL);
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#include "npcx.h"
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#define NPCX_STATUS_IBBR BIT(7)
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#define NPCX_STATUS_VSBY BIT(1)
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#define NPCX_STATUS_VCC1 BIT(0)
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#define DRV_STATUS(dev) \
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(*((volatile uint8_t *)((const struct bbram_npcx_config *)(dev)->config)->status_reg_addr))
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static int get_bit_and_reset(const struct device *dev, int mask)
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{
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int result = DRV_STATUS(dev) & mask;
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/* Clear the bit(s) */
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DRV_STATUS(dev) &= ~mask;
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return result;
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}
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static int bbram_npcx_check_invalid(const struct device *dev)
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{
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return get_bit_and_reset(dev, NPCX_STATUS_IBBR);
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}
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static int bbram_npcx_check_standby_power(const struct device *dev)
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{
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return get_bit_and_reset(dev, NPCX_STATUS_VSBY);
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}
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static int bbram_npcx_check_power(const struct device *dev)
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{
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return get_bit_and_reset(dev, NPCX_STATUS_VCC1);
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}
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static int bbram_npcx_get_size(const struct device *dev, size_t *size)
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{
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const struct bbram_npcx_config *config = dev->config;
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*size = config->size;
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return 0;
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}
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static int bbram_npcx_read(const struct device *dev, size_t offset, size_t size,
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uint8_t *data)
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{
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const struct bbram_npcx_config *config = dev->config;
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if (size < 1 || offset + size > config->size || bbram_npcx_check_invalid(dev)) {
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return -EINVAL;
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}
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bytecpy(data, ((uint8_t *)config->base_addr + offset), size);
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return 0;
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}
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static int bbram_npcx_write(const struct device *dev, size_t offset, size_t size,
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const uint8_t *data)
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{
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const struct bbram_npcx_config *config = dev->config;
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if (size < 1 || offset + size > config->size || bbram_npcx_check_invalid(dev)) {
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return -EINVAL;
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}
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bytecpy(((uint8_t *)config->base_addr + offset), data, size);
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return 0;
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}
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static const struct bbram_driver_api bbram_npcx_driver_api = {
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.check_invalid = bbram_npcx_check_invalid,
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.check_standby_power = bbram_npcx_check_standby_power,
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.check_power = bbram_npcx_check_power,
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.get_size = bbram_npcx_get_size,
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.read = bbram_npcx_read,
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.write = bbram_npcx_write,
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};
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#define BBRAM_INIT(inst) \
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BBRAM_NPCX_DECL_CONFIG(inst); \
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DEVICE_DT_INST_DEFINE(inst, NULL, NULL, NULL, &bbram_cfg_##inst, PRE_KERNEL_1, \
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CONFIG_BBRAM_INIT_PRIORITY, &bbram_npcx_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(BBRAM_INIT);
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