ixdp2400_flash.c

基于ecos的redboot

//==========================================================================
//
//      ixdp2400_flash.c
//
//      Flash programming
//
//==========================================================================
//####COPYRIGHTBEGIN####
//                                                                          
// -------------------------------------------                              
// The contents of this file are subject to the Red Hat eCos Public License 
// Version 1.1 (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.redhat.com/                                                   
//                                                                          
// Software distributed under the License is distributed on an "AS IS"      
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
// License for the specific language governing rights and limitations under 
// the License.                                                             
//                                                                          
// The Original Code is eCos - Embedded Configurable Operating System,      
// released September 30, 1998.                                             
//                                                                          
// The Initial Developer of the Original Code is Red Hat.                   
// Portions created by Red Hat are                                          
// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
// All Rights Reserved.                                                     
// -------------------------------------------                              
//                                                                          
//####COPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    lagarwal
// Contributors:
// Date:         2002-03-08
// Purpose:      
// Description:  contains routine to initialize flash device
//              
//####DESCRIPTIONEND####
//
//==========================================================================

#include <pkgconf/hal.h>
#include <cyg/hal/hal_arch.h>
#include <cyg/hal/hal_cache.h>
#include <cyg/hal/cfg_utility.h>
#include <cyg/hal/hal_platform_ints.h>
#include <redboot.h>

#define  _FLASH_PRIVATE_
#include <cyg/io/flash.h>

#include "flash.h"

extern struct board_config *board_config_data;
extern int strncmp(const char *s1, const char *s2, int len);

#ifndef CYGHWR_IO_FLASH_DEVICE_NOT_IN_RAM
// Use this function to make function pointers anonymous - forcing the
// compiler to use jumps instead of branches when calling driver
// services.
static void* __anonymizer(void* p)
{
  return p;
}
#endif

int
flash_hwr_init(void)
{
    unsigned char data[2];
    typedef int code_fun(unsigned char *);
    code_fun *_flash_query;
    int stat, num_regions, region_size;

	display_led('F', 'L', 'S', 'H');

#ifdef CYGHWR_IO_FLASH_DEVICE_NOT_IN_RAM
	{
		extern char flash_query, flash_query_end;
		int code_len;

		// Copy 'program' code to RAM for execution
		code_len = (unsigned long)&flash_query_end - (unsigned long)&flash_query;
		_flash_query = (code_fun *)flash_info.work_space;
		memcpy(_flash_query, &flash_query, code_len);
		HAL_DCACHE_SYNC();  // Should guarantee this code will run
		HAL_ICACHE_DISABLE(); // is also required to avoid old contents
	}
#else
	{
        externC code_fun flash_query;
        _flash_query = (code_fun*) __anonymizer(&flash_query);
    }
#endif

    memset(data,0,2);
    stat = (*_flash_query)(data);
#ifdef CYGHWR_IO_FLASH_DEVICE_NOT_IN_RAM
    HAL_ICACHE_ENABLE();
#endif

    if(data[0] != FLASH_Intel_code) 
	{
		(*flash_info.pf)("Unknown flash manufacturer: 0x%02x\n", data[0]);
		return FLASH_ERR_HWR;
	}
	
	switch (data[1])
	{
    case (unsigned char)0x18:
		num_regions = 128;
        region_size = 0x20000;    //128K
        break;
    case (unsigned char)0x17:
		num_regions = 64;
        region_size = 0x20000;
        break;
    case (unsigned char)0x16:
		num_regions = 32;
        region_size = 0x20000;
        break;
    default:
		(*flash_info.pf)("Unknown device type: 0x%02x\n", data[1]);
        return FLASH_ERR_HWR;
	}
	board_config_data->flash_size = num_regions * region_size;
	flash_info.block_size = region_size;
	flash_info.blocks = num_regions;
	flash_info.start = (void *)FLASH_BASE;
	flash_info.end = (void *)(FLASH_BASE + (num_regions * region_size));
	return FLASH_ERR_OK;
}

// Map a hardware status to a package error
int
flash_hwr_map_error(int err)
{
    if (err & 0x7E) {
        (*flash_info.pf)("Err = %x\n", err);
        switch(err)
        {
        case(0x2):
            return FLASH_ERR_PROTECT;
        case(0x4):
            return FLASH_ERR_PROGRAM_SUSPEND;
        case(0x8):
            return FLASH_ERR_LOW_VOLTAGE;
        case(0x10):
            return FLASH_ERR_LOCK;
        case(0x20):
            return FLASH_ERR_ERASE;
        case(0x40):
            return FLASH_ERR_ERASE_SUSPEND;
        default:
            return FLASH_ERR_HWR;
        }
    } else {
        return FLASH_ERR_OK;
    }
}

// See if a range of FLASH addresses overlaps BootMonitor code
bool
flash_code_overlaps(void *start, void *end, bool *overlap)
{
	if(((FLASH_BASE >= (unsigned long)start) &&
		(FLASH_BASE < (unsigned long)end)) ||
		(((FLASH_BASE + CYGBLD_REDBOOT_MIN_IMAGE_SIZE) > (unsigned long)start) &&
		((FLASH_BASE + CYGBLD_REDBOOT_MIN_IMAGE_SIZE) < (unsigned long)end)))
	{
		*overlap = true;
		printf("Your action requires changes to BootMonitor blocks\n");
		if(!verify_action("Continue"))
		{
			return true;
		}
	}

    return false;
}