100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
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/*
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* Copyright (c) 2021 Microchip 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 microchip_xec_bbram
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#include <drivers/bbram.h>
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#include <errno.h>
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#include <soc.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_xec_config {
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/** BBRAM base address */
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uint8_t *base;
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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_xec_check_invalid(const struct device *dev)
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{
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struct vbatr_regs *const regs = (struct vbatr_regs *)(DT_REG_ADDR_BY_NAME(
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DT_INST(0, microchip_xec_pcr), vbatr));
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if (regs->PFRS & BIT(MCHP_VBATR_PFRS_VBAT_RST_POS)) {
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regs->PFRS |= BIT(MCHP_VBATR_PFRS_VBAT_RST_POS);
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LOG_ERR("VBAT power rail failure");
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return -EFAULT;
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}
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return 0;
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}
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static int bbram_xec_get_size(const struct device *dev, size_t *size)
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{
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const struct bbram_xec_config *dcfg = dev->config;
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*size = dcfg->size;
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return 0;
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}
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static int bbram_xec_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_xec_config *dcfg = dev->config;
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if (size < 1 || offset + size > dcfg->size) {
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LOG_ERR("Invalid params");
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return -EFAULT;
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}
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bytecpy(data, dcfg->base + offset, size);
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return 0;
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}
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static int bbram_xec_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_xec_config *dcfg = dev->config;
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if (size < 1 || offset + size > dcfg->size) {
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LOG_ERR("Invalid params");
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return -EFAULT;
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}
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bytecpy(dcfg->base + offset, data, size);
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return 0;
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}
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static const struct bbram_driver_api bbram_xec_driver_api = {
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.check_invalid = bbram_xec_check_invalid,
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.get_size = bbram_xec_get_size,
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.read = bbram_xec_read,
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.write = bbram_xec_write,
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};
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static int bbram_xec_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_xec_config bbram_cfg_##inst = { \
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.base = (uint8_t *)(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_xec_init, NULL, NULL, \
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&bbram_cfg_##inst, \
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PRE_KERNEL_1, CONFIG_BBRAM_INIT_PRIORITY, \
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&bbram_xec_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(BBRAM_INIT);
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