OpenModem/bertos/cpu/arm/drv/flash_at91.c

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2014-04-03 16:21:37 -04:00
/**
* \file
* <!--
* This file is part of BeRTOS.
*
* Bertos is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As a special exception, you may use this file as part of a free software
* library without restriction. Specifically, if other files instantiate
* templates or use macros or inline functions from this file, or you compile
* this file and link it with other files to produce an executable, this
* file does not by itself cause the resulting executable to be covered by
* the GNU General Public License. This exception does not however
* invalidate any other reasons why the executable file might be covered by
* the GNU General Public License.
*
* Copyright 2009 Develer S.r.l. (http://www.develer.com/)
*
* -->
*
* \author Daniele Basile <asterix@develer.com>
*
* \brief At91sam7 Internal flash read/write driver.
*
*
*/
#include "flash_at91.h"
#include "cfg/cfg_emb_flash.h"
#include <cfg/macros.h>
// Define log settings for cfg/log.h
#define LOG_LEVEL CONFIG_FLASH_EMB_LOG_LEVEL
#define LOG_FORMAT CONFIG_FLASH_EMB_LOG_FORMAT
#include <cfg/log.h>
#include <cpu/irq.h>
#include <cpu/attr.h>
#include <cpu/power.h>
#include <io/kfile.h>
#include <io/kblock.h>
#include <io/arm.h>
#include <drv/timer.h>
#include <drv/flash.h>
#include <string.h>
struct FlashHardware
{
uint8_t status;
};
/**
* Really send the flash write command.
*
* \note This function has to be placed in RAM because
* executing code from flash while a writing process
* is in progress is forbidden.
*/
RAM_FUNC NOINLINE static void write_page(uint32_t page)
{
// Send the 'write page' command
MC_FCR = MC_KEY | MC_FCMD_WP | (MC_PAGEN_MASK & (page << 8));
// Wait for the end of command
while(!(MC_FSR & BV(MC_FRDY)))
{
//NOP;
}
}
/**
* Send write command.
*
* After WR command cpu write bufferd page into flash memory.
*
*/
INLINE void flash_sendWRcmd(uint32_t page)
{
cpu_flags_t flags;
LOG_INFO("Writing page %ld...\n", page);
IRQ_SAVE_DISABLE(flags);
write_page(page);
IRQ_RESTORE(flags);
LOG_INFO("Done\n");
}
/**
* Return true if no error are occurred after flash memory
* read or write operation, otherwise return error code.
*/
static bool flash_getStatus(struct KBlock *blk)
{
Flash *fls = FLASH_CAST(blk);
/*
* This bit is set to one if an invalid command and/or a bad keywords was/were
* written in the Flash Command Register.
*/
if(MC_FSR & BV(MC_PROGE))
{
fls->hw->status |= FLASH_WR_ERR;
LOG_ERR("flash not erased..\n");
return false;
}
/*
* This bit is set to one if we programming of at least one locked lock
* region.
*/
if(MC_FSR & BV(MC_LOCKE))
{
fls->hw->status |= FLASH_WR_PROTECT;
LOG_ERR("wr protect..\n");
return false;
}
return true;
}
static size_t at91_flash_readDirect(struct KBlock *blk, block_idx_t idx, void *buf, size_t offset, size_t size)
{
memcpy(buf, (void *)(idx * blk->blk_size + FLASH_BASE + offset), size);
return size;
}
static size_t at91_flash_writeDirect(struct KBlock *blk, block_idx_t idx, const void *_buf, size_t offset, size_t size)
{
ASSERT(offset == 0);
ASSERT(size == blk->blk_size);
uint32_t *addr = (uint32_t *)(idx * blk->blk_size + FLASH_BASE);
const uint8_t *buf = (const uint8_t *)_buf;
while (size)
{
uint32_t data = (*(buf + 3) << 24) |
(*(buf + 2) << 16) |
(*(buf + 1) << 8) |
*buf;
*addr = data;
size -= 4;
buf += 4;
addr++;
}
flash_sendWRcmd(idx);
if (!flash_getStatus(blk))
return 0;
return blk->blk_size;
}
static int at91_flash_error(struct KBlock *blk)
{
Flash *fls = FLASH_CAST(blk);
return fls->hw->status;
}
static void at91_flash_clearerror(struct KBlock *blk)
{
Flash *fls = FLASH_CAST(blk);
fls->hw->status = 0;
}
static const KBlockVTable flash_at91_buffered_vt =
{
.readDirect = at91_flash_readDirect,
.writeDirect = at91_flash_writeDirect,
.readBuf = kblock_swReadBuf,
.writeBuf = kblock_swWriteBuf,
.load = kblock_swLoad,
.store = kblock_swStore,
.error = at91_flash_error,
.clearerr = at91_flash_clearerror,
};
static const KBlockVTable flash_at91_unbuffered_vt =
{
.readDirect = at91_flash_readDirect,
.writeDirect = at91_flash_writeDirect,
.error = at91_flash_error,
.clearerr = at91_flash_clearerror,
};
static struct FlashHardware flash_at91_hw;
static uint8_t flash_buf[FLASH_PAGE_SIZE_BYTES];
static void common_init(Flash *fls)
{
memset(fls, 0, sizeof(*fls));
DB(fls->blk.priv.type = KBT_FLASH);
fls->hw = &flash_at91_hw;
fls->blk.blk_size = FLASH_PAGE_SIZE_BYTES;
fls->blk.blk_cnt = FLASH_MEM_SIZE / FLASH_PAGE_SIZE_BYTES;
}
void flash_hw_init(Flash *fls, UNUSED_ARG(int, flags))
{
common_init(fls);
fls->blk.priv.vt = &flash_at91_buffered_vt;
fls->blk.priv.flags |= KB_BUFFERED | KB_PARTIAL_WRITE;
fls->blk.priv.buf = flash_buf;
/* Load the first block in the cache */
memcpy(fls->blk.priv.buf, (void *)(FLASH_BASE), fls->blk.blk_size);
}
void flash_hw_initUnbuffered(Flash *fls, UNUSED_ARG(int, flags))
{
common_init(fls);
fls->blk.priv.vt = &flash_at91_unbuffered_vt;
}