blob: 56a1cab2b9aa278e18ff186f3eb456625d832094 [file] [log] [blame]
/*
* Copyright (c) 2021 Microchip Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT microchip_xec_bbram
#include <zephyr/drivers/bbram.h>
#include <errno.h>
#include <soc.h>
#include <zephyr/sys/util.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(bbram, CONFIG_BBRAM_LOG_LEVEL);
/** Device config */
struct bbram_xec_config {
/** BBRAM base address */
uint8_t *base;
/** BBRAM size (Unit:bytes) */
int size;
};
static int bbram_xec_check_invalid(const struct device *dev)
{
struct vbatr_regs *const regs = (struct vbatr_regs *)(DT_REG_ADDR_BY_NAME(
DT_NODELABEL(pcr), vbatr));
if (regs->PFRS & BIT(MCHP_VBATR_PFRS_VBAT_RST_POS)) {
regs->PFRS |= BIT(MCHP_VBATR_PFRS_VBAT_RST_POS);
LOG_ERR("VBAT power rail failure");
return -EFAULT;
}
return 0;
}
static int bbram_xec_get_size(const struct device *dev, size_t *size)
{
const struct bbram_xec_config *dcfg = dev->config;
*size = dcfg->size;
return 0;
}
static int bbram_xec_read(const struct device *dev, size_t offset, size_t size,
uint8_t *data)
{
const struct bbram_xec_config *dcfg = dev->config;
if (size < 1 || offset + size > dcfg->size) {
LOG_ERR("Invalid params");
return -EFAULT;
}
bytecpy(data, dcfg->base + offset, size);
return 0;
}
static int bbram_xec_write(const struct device *dev, size_t offset, size_t size,
const uint8_t *data)
{
const struct bbram_xec_config *dcfg = dev->config;
if (size < 1 || offset + size > dcfg->size) {
LOG_ERR("Invalid params");
return -EFAULT;
}
bytecpy(dcfg->base + offset, data, size);
return 0;
}
static const struct bbram_driver_api bbram_xec_driver_api = {
.check_invalid = bbram_xec_check_invalid,
.get_size = bbram_xec_get_size,
.read = bbram_xec_read,
.write = bbram_xec_write,
};
#define BBRAM_INIT(inst) \
static const struct bbram_xec_config bbram_cfg_##inst = { \
.base = (uint8_t *)(DT_INST_REG_ADDR(inst)), \
.size = DT_INST_REG_SIZE(inst), \
}; \
DEVICE_DT_INST_DEFINE(inst, NULL, NULL, NULL, &bbram_cfg_##inst,\
PRE_KERNEL_1, CONFIG_BBRAM_INIT_PRIORITY, \
&bbram_xec_driver_api);
DT_INST_FOREACH_STATUS_OKAY(BBRAM_INIT);