121 lines
3.0 KiB
C
121 lines
3.0 KiB
C
/*
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* Copyright (c) 2016 Linaro Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <misc/sys_log.h>
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#include <nanokernel.h>
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#include <device.h>
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#include <string.h>
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#include <flash.h>
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#include <errno.h>
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#include <init.h>
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#include <soc.h>
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#include "fsl_common.h"
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#include "fsl_flash.h"
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struct flash_priv {
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flash_config_t config;
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};
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/*
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* Interrupt vectors could be executed from flash hence the need for locking.
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* The underlying KDSK driver takes care of copying the functions to SRAM.
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*
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* For more information, see the application note below on Read-While-Write
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* http://cache.freescale.com/files/32bit/doc/app_note/AN4695.pdf
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*
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*/
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static int flash_ksdk_erase(struct device *dev, off_t offset, size_t len)
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{
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struct flash_priv *priv = dev->driver_data;
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uint32_t addr;
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status_t rc;
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int key;
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addr = offset + priv->config.PFlashBlockBase;
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key = irq_lock();
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rc = FLASH_Erase(&priv->config, addr, len, kFLASH_apiEraseKey);
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irq_unlock(key);
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return (rc == kStatus_Success) ? 0 : -EINVAL;
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}
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static int flash_ksdk_read(struct device *dev, off_t offset,
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void *data, size_t len)
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{
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struct flash_priv *priv = dev->driver_data;
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uint32_t addr;
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/*
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* The KSDK supports different flash chips whose valid ranges are
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* hidden below the API: until the API export these ranges, we can not
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* do any generic validation
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*/
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addr = offset + priv->config.PFlashBlockBase;
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memcpy(data, (void *) addr, len);
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return 0;
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}
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static int flash_ksdk_write(struct device *dev, off_t offset,
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const void *data, size_t len)
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{
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struct flash_priv *priv = dev->driver_data;
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uint32_t addr;
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status_t rc;
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int key;
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addr = offset + priv->config.PFlashBlockBase;
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key = irq_lock();
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rc = FLASH_Program(&priv->config, addr, (uint32_t *) data, len);
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irq_unlock(key);
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return (rc == kStatus_Success) ? 0 : -EINVAL;
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}
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static int flash_ksdk_write_protection(struct device *dev, bool enable)
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{
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return -EIO;
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}
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static struct flash_priv flash_data;
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static const struct flash_driver_api flash_ksdk_api = {
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.write_protection = flash_ksdk_write_protection,
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.erase = flash_ksdk_erase,
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.write = flash_ksdk_write,
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.read = flash_ksdk_read,
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};
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static int flash_ksdk_init(struct device *dev)
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{
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struct flash_priv *priv = dev->driver_data;
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status_t rc;
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rc = FLASH_Init(&priv->config);
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return (rc == kStatus_Success) ? 0 : -EIO;
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}
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DEVICE_AND_API_INIT(flash_ksdk, CONFIG_SOC_FLASH_KSDK_DEV_NAME,
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flash_ksdk_init, &flash_data, NULL, POST_KERNEL,
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CONFIG_KERNEL_INIT_PRIORITY_DEVICE, &flash_ksdk_api);
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