121 lines
2.5 KiB
C
121 lines
2.5 KiB
C
/*
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* Copyright (c) 2020 Seagate Technology LLC
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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 nxp_lpc11u6x_eeprom
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/**
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* @file
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* @brief EEPROM driver for NXP LPC11U6X MCUs
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*
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* This driver supports the on-chip EEPROM found on NXP LPC11U6x MCUs.
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*
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* @note This driver is only a wrapper for the IAP (In-Application Programming)
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* EEPROM functions.
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*/
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#include <drivers/eeprom.h>
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#include <iap.h>
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#define LOG_LEVEL CONFIG_EEPROM_LOG_LEVEL
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#include <logging/log.h>
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LOG_MODULE_REGISTER(eeprom_lpc11u6x);
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struct eeprom_lpc11u6x_config {
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size_t size;
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};
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static int eeprom_lpc11u6x_read(const struct device *dev,
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off_t offset, void *data, size_t len)
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{
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const struct eeprom_lpc11u6x_config *config = dev->config;
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uint32_t cmd[5];
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int ret;
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if (!len) {
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return 0;
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}
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if ((offset + len) > config->size) {
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LOG_WRN("attempt to read past device boundary");
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return -EINVAL;
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}
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cmd[0] = IAP_CMD_EEPROM_READ;
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cmd[1] = offset;
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cmd[2] = (uint32_t) data;
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cmd[3] = len;
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cmd[4] = CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC / 1000;
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ret = iap_cmd(cmd);
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if (ret != IAP_STATUS_CMD_SUCCESS) {
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LOG_ERR("failed to read EEPROM (offset=%08x len=%d err=%d)",
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(unsigned int) offset, len, ret);
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return -EINVAL;
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}
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return 0;
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}
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static int eeprom_lpc11u6x_write(const struct device *dev,
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off_t offset, const void *data, size_t len)
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{
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const struct eeprom_lpc11u6x_config *config = dev->config;
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uint32_t cmd[5];
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int ret;
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if (!len) {
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return 0;
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}
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if ((offset + len) > config->size) {
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LOG_WRN("attempt to write past device boundary");
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return -EINVAL;
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}
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cmd[0] = IAP_CMD_EEPROM_WRITE;
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cmd[1] = offset;
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cmd[2] = (uint32_t) data;
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cmd[3] = len;
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cmd[4] = CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC / 1000;
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ret = iap_cmd(cmd);
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if (ret != IAP_STATUS_CMD_SUCCESS) {
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LOG_ERR("failed to write EEPROM (offset=%08x len=%d err=%d)",
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(unsigned int) offset, len, ret);
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return -EINVAL;
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}
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return 0;
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}
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static size_t eeprom_lpc11u6x_size(const struct device *dev)
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{
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const struct eeprom_lpc11u6x_config *config = dev->config;
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return config->size;
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}
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static int eeprom_lpc11u6x_init(const struct device *dev)
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{
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return 0;
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}
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static const struct eeprom_driver_api eeprom_lpc11u6x_api = {
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.read = eeprom_lpc11u6x_read,
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.write = eeprom_lpc11u6x_write,
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.size = eeprom_lpc11u6x_size,
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};
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static const struct eeprom_lpc11u6x_config eeprom_config = {
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.size = DT_INST_PROP(0, size),
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};
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DEVICE_DT_INST_DEFINE(0, &eeprom_lpc11u6x_init, NULL, NULL,
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&eeprom_config, POST_KERNEL,
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CONFIG_EEPROM_INIT_PRIORITY, &eeprom_lpc11u6x_api);
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