71 lines
1.9 KiB
C
71 lines
1.9 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 ite_it8xxx2_bbram
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#include <drivers/bbram.h>
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#include <errno.h>
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#include <sys/util.h>
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#include <logging/log.h>
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LOG_MODULE_REGISTER(bbram, CONFIG_BBRAM_LOG_LEVEL);
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/** Device config */
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struct bbram_it8xxx2_config {
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/** BBRAM base address */
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uintptr_t base_addr;
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/** BBRAM size (Unit:bytes) */
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int size;
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};
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static int bbram_it8xxx2_read(const struct device *dev, size_t offset, size_t size, uint8_t *data)
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{
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const struct bbram_it8xxx2_config *config = dev->config;
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if (size < 1 || offset + size > config->size) {
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return -EFAULT;
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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_it8xxx2_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_it8xxx2_config *config = dev->config;
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if (size < 1 || offset + size > config->size) {
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return -EFAULT;
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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_it8xxx2_driver_api = {
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.read = bbram_it8xxx2_read,
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.write = bbram_it8xxx2_write,
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};
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static int bbram_it8xxx2_init(const struct device *dev)
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{
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ARG_UNUSED(dev);
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return 0;
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}
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#define BBRAM_INIT(inst) \
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static const struct bbram_it8xxx2_config bbram_cfg_##inst = { \
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.base_addr = DT_INST_REG_ADDR(inst), \
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.size = DT_INST_REG_SIZE(inst), \
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}; \
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DEVICE_DT_INST_DEFINE(inst, bbram_it8xxx2_init, NULL, NULL, &bbram_cfg_##inst, \
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PRE_KERNEL_1, CONFIG_BBRAM_INIT_PRIORITY, \
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&bbram_it8xxx2_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(BBRAM_INIT);
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