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drivers: eeprom: add driver for NXP LPC11U6X

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This patch adds adds an EEPROM driver supporting the on-chip EEPROM
found on NXP LPC11U6X MCUs. Note that this driver is only a wrapper
relying entirely on the IAP (In-Application Programming) EEPROM
commands.

Signed-off-by: Simon Guinot <simon.guinot@seagate.com>
This commit is contained in:
Simon Guinot 2020-05-14 12:22:06 +02:00 • committed by Carles Cufí
commit 319d9d94a8
4 changed files with 132 additions and 0 deletions
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1
drivers/eeprom/CMakeLists.txt
View file

@ -6,5 +6,6 @@ zephyr_library_sources_ifdef(CONFIG_USERSPACE eeprom_handlers.c)
zephyr_library_sources_ifdef(CONFIG_EEPROM_SHELL eeprom_shell.c)
zephyr_library_sources_ifdef(CONFIG_EEPROM_AT2X eeprom_at2x.c)
zephyr_library_sources_ifdef(CONFIG_EEPROM_LPC11U6X eeprom_lpc11u6x.c)
zephyr_library_sources_ifdef(CONFIG_EEPROM_STM32 eeprom_stm32.c)
zephyr_library_sources_ifdef(CONFIG_EEPROM_SIMULATOR eeprom_simulator.c)

1
drivers/eeprom/Kconfig
View file

@ -49,6 +49,7 @@ config EEPROM_AT25
help
Enable support for Atmel AT25 (and compatible) SPI EEPROMs.
source "drivers/eeprom/Kconfig.lpc11u6x"
source "drivers/eeprom/Kconfig.stm32"
config EEPROM_SIMULATOR

9
drivers/eeprom/Kconfig.lpc11u6x Normal file
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@ -0,0 +1,9 @@
# Copyright (c) 2020 Seagate Technology LLC
# SPDX-License-Identifier: Apache-2.0
config EEPROM_LPC11U6X
bool "LPC11U6x EEPROM driver"
depends on SOC_SERIES_LPC11U6X
default y
help
Enable support for the on-chip EEPROM found on NXP LPC11U6x MCUs.

121
drivers/eeprom/eeprom_lpc11u6x.c Normal file
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@ -0,0 +1,121 @@
/*
* Copyright (c) 2020 Seagate Technology LLC
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT nxp_lpc11u6x_eeprom
/**
* @file
* @brief EEPROM driver for NXP LPC11U6X MCUs
*
* This driver supports the on-chip EEPROM found on NXP LPC11U6x MCUs.
*
* @note This driver is only a wrapper for the IAP (In-Application Programming)
* EEPROM funcions.
*/
#include <drivers/eeprom.h>
#include <iap.h>
#define LOG_LEVEL CONFIG_EEPROM_LOG_LEVEL
#include <logging/log.h>
LOG_MODULE_REGISTER(eeprom_lpc11u6x);
struct eeprom_lpc11u6x_config {
size_t size;
};
static int eeprom_lpc11u6x_read(struct device *dev,
off_t offset, void *data, size_t len)
{
const struct eeprom_lpc11u6x_config *config = dev->config_info;
uint32_t cmd[5];
int ret;
if (!len) {
return 0;
}
if ((offset + len) > config->size) {
LOG_WRN("attempt to read past device boundary");
return -EINVAL;
}
cmd[0] = IAP_CMD_EEPROM_READ;
cmd[1] = offset;
cmd[2] = (uint32_t) data;
cmd[3] = len;
cmd[4] = CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC / 1000;
ret = iap_cmd(cmd);
if (ret != IAP_STATUS_CMD_SUCCESS) {
LOG_ERR("failed to read EEPROM (offset=%08x len=%d err=%d)",
(unsigned int) offset, len, ret);
return -EINVAL;
}
return 0;
}
static int eeprom_lpc11u6x_write(struct device *dev,
off_t offset, const void *data, size_t len)
{
const struct eeprom_lpc11u6x_config *config = dev->config_info;
uint32_t cmd[5];
int ret;
if (!len) {
return 0;
}
if ((offset + len) > config->size) {
LOG_WRN("attempt to write past device boundary");
return -EINVAL;
}
cmd[0] = IAP_CMD_EEPROM_WRITE;
cmd[1] = offset;
cmd[2] = (uint32_t) data;
cmd[3] = len;
cmd[4] = CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC / 1000;
ret = iap_cmd(cmd);
if (ret != IAP_STATUS_CMD_SUCCESS) {
LOG_ERR("failed to write EEPROM (offset=%08x len=%d err=%d)",
(unsigned int) offset, len, ret);
return -EINVAL;
}
return 0;
}
static size_t eeprom_lpc11u6x_size(struct device *dev)
{
const struct eeprom_lpc11u6x_config *config = dev->config_info;
return config->size;
}
static int eeprom_lpc11u6x_init(struct device *dev)
{
return 0;
}
static const struct eeprom_driver_api eeprom_lpc11u6x_api = {
.read = eeprom_lpc11u6x_read,
.write = eeprom_lpc11u6x_write,
.size = eeprom_lpc11u6x_size,
};
static const struct eeprom_lpc11u6x_config eeprom_config = {
.size = DT_INST_PROP(0, size),
};
DEVICE_AND_API_INIT(eeprom_lpc11u6x, DT_INST_LABEL(0),
&eeprom_lpc11u6x_init, NULL,
&eeprom_config, POST_KERNEL,
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &eeprom_lpc11u6x_api);