blob: 7971bf150396200a9d2c1384130899a358e1fdea [file] [log] [blame] [edit]
/*
* Copyright (c) 2016 Linaro Limited
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT openisa_rv32m1_ftfe
#define SOC_NV_FLASH_NODE DT_INST(0, soc_nv_flash)
#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <string.h>
#include <zephyr/drivers/flash.h>
#include <errno.h>
#include <zephyr/init.h>
#include <soc.h>
#include "flash_priv.h"
#include "fsl_common.h"
#include "fsl_flash.h"
struct flash_priv {
flash_config_t config;
/*
* HACK: flash write protection is managed in software.
*/
struct k_sem write_lock;
uint32_t pflash_block_base;
};
static const struct flash_parameters flash_mcux_parameters = {
.write_block_size = FSL_FEATURE_FLASH_PFLASH_BLOCK_WRITE_UNIT_SIZE,
.erase_value = 0xff,
};
/*
* Interrupt vectors could be executed from flash hence the need for locking.
* The underlying MCUX driver takes care of copying the functions to SRAM.
*
* For more information, see the application note below on Read-While-Write
* http://cache.freescale.com/files/32bit/doc/app_note/AN4695.pdf
*
*/
static int flash_mcux_erase(const struct device *dev, off_t offset,
size_t len)
{
struct flash_priv *priv = dev->data;
uint32_t addr;
status_t rc;
unsigned int key;
if (k_sem_take(&priv->write_lock, K_FOREVER)) {
return -EACCES;
}
addr = offset + priv->pflash_block_base;
key = irq_lock();
rc = FLASH_Erase(&priv->config, addr, len, kFLASH_ApiEraseKey);
irq_unlock(key);
k_sem_give(&priv->write_lock);
return (rc == kStatus_Success) ? 0 : -EINVAL;
}
static int flash_mcux_read(const struct device *dev, off_t offset,
void *data, size_t len)
{
struct flash_priv *priv = dev->data;
uint32_t addr;
/*
* The MCUX supports different flash chips whose valid ranges are
* hidden below the API: until the API export these ranges, we can not
* do any generic validation
*/
addr = offset + priv->pflash_block_base;
memcpy(data, (void *) addr, len);
return 0;
}
static int flash_mcux_write(const struct device *dev, off_t offset,
const void *data, size_t len)
{
struct flash_priv *priv = dev->data;
uint32_t addr;
status_t rc;
unsigned int key;
if (k_sem_take(&priv->write_lock, K_FOREVER)) {
return -EACCES;
}
addr = offset + priv->pflash_block_base;
key = irq_lock();
rc = FLASH_Program(&priv->config, addr, (uint32_t *) data, len);
irq_unlock(key);
k_sem_give(&priv->write_lock);
return (rc == kStatus_Success) ? 0 : -EINVAL;
}
#if defined(CONFIG_FLASH_PAGE_LAYOUT)
static const struct flash_pages_layout dev_layout = {
.pages_count = DT_REG_SIZE(SOC_NV_FLASH_NODE) /
DT_PROP(SOC_NV_FLASH_NODE, erase_block_size),
.pages_size = DT_PROP(SOC_NV_FLASH_NODE, erase_block_size),
};
static void flash_mcux_pages_layout(const struct device *dev,
const struct flash_pages_layout **layout,
size_t *layout_size)
{
*layout = &dev_layout;
*layout_size = 1;
}
#endif /* CONFIG_FLASH_PAGE_LAYOUT */
static const struct flash_parameters *
flash_mcux_get_parameters(const struct device *dev)
{
ARG_UNUSED(dev);
return &flash_mcux_parameters;
}
static struct flash_priv flash_data;
static const struct flash_driver_api flash_mcux_api = {
.erase = flash_mcux_erase,
.write = flash_mcux_write,
.read = flash_mcux_read,
.get_parameters = flash_mcux_get_parameters,
#if defined(CONFIG_FLASH_PAGE_LAYOUT)
.page_layout = flash_mcux_pages_layout,
#endif
};
static int flash_mcux_init(const struct device *dev)
{
struct flash_priv *priv = dev->data;
uint32_t pflash_block_base;
status_t rc;
CLOCK_EnableClock(kCLOCK_Mscm);
k_sem_init(&priv->write_lock, 1, 1);
rc = FLASH_Init(&priv->config);
FLASH_GetProperty(&priv->config, kFLASH_PropertyPflashBlockBaseAddr,
(uint32_t *)&pflash_block_base);
priv->pflash_block_base = (uint32_t) pflash_block_base;
return (rc == kStatus_Success) ? 0 : -EIO;
}
DEVICE_DT_INST_DEFINE(0, flash_mcux_init, NULL,
&flash_data, NULL, POST_KERNEL,
CONFIG_FLASH_INIT_PRIORITY, &flash_mcux_api);