michaelh/zephyr
1
0
Fork 0
Code Releases Activity

drivers: flash: SoC KSDK

Browse source 
This KSDK flash shim driver supports the device in the FRDM K64F
platform (enabled with this commit).

WARNING: the driver disables the system interrupts for potentially
long periods of time. This is required to avoid Read-While-Write
issues since most platforms run in XIP mode.

For more detailed information see the link below:
http://cache.freescale.com/files/32bit/doc/app_note/AN4695.pdf

Change-Id: I70f8d09080251033ce2f45be0c2eb95c19fded08
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
This commit is contained in:
Jorge Ramirez-Ortiz 2016-10-21 10:58:53 +02:00 • committed by Maureen Helm
commit 27ecd5d8f3
5 changed files with 148 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

120
drivers/flash/soc_flash_ksdk.c Normal file
View file

@ -0,0 +1,120 @@
/*
* Copyright (c) 2016 Linaro Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <misc/sys_log.h>
#include <nanokernel.h>
#include <device.h>
#include <string.h>
#include <flash.h>
#include <errno.h>
#include <init.h>
#include <soc.h>
#include "fsl_common.h"
#include "fsl_flash.h"
struct flash_priv {
flash_config_t config;
};
/*
* Interrupt vectors could be executed from flash hence the need for locking.
* The underlying KDSK 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_ksdk_erase(struct device *dev, off_t offset, size_t len)
{
struct flash_priv *priv = dev->driver_data;
uint32_t addr;
status_t rc;
int key;
addr = offset + priv->config.PFlashBlockBase;
key = irq_lock();
rc = FLASH_Erase(&priv->config, addr, len, kFLASH_apiEraseKey);
irq_unlock(key);
return (rc == kStatus_Success) ? 0 : -EINVAL;
}
static int flash_ksdk_read(struct device *dev, off_t offset,
void *data, size_t len)
{
struct flash_priv *priv = dev->driver_data;
uint32_t addr;
/*
* The KSDK 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->config.PFlashBlockBase;
memcpy(data, (void *) addr, len);
return 0;
}
static int flash_ksdk_write(struct device *dev, off_t offset,
const void *data, size_t len)
{
struct flash_priv *priv = dev->driver_data;
uint32_t addr;
status_t rc;
int key;
addr = offset + priv->config.PFlashBlockBase;
key = irq_lock();
rc = FLASH_Program(&priv->config, addr, (uint32_t *) data, len);
irq_unlock(key);
return (rc == kStatus_Success) ? 0 : -EINVAL;
}
static int flash_ksdk_write_protection(struct device *dev, bool enable)
{
return -EIO;
}
static struct flash_priv flash_data;
static const struct flash_driver_api flash_ksdk_api = {
.write_protection = flash_ksdk_write_protection,
.erase = flash_ksdk_erase,
.write = flash_ksdk_write,
.read = flash_ksdk_read,
};
static int flash_ksdk_init(struct device *dev)
{
struct flash_priv *priv = dev->driver_data;
status_t rc;
rc = FLASH_Init(&priv->config);
return (rc == kStatus_Success) ? 0 : -EIO;
}
DEVICE_AND_API_INIT(flash_ksdk, CONFIG_SOC_FLASH_KSDK_DEV_NAME,
flash_ksdk_init, &flash_data, NULL, SECONDARY,
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &flash_ksdk_api);