flashiodev.c

ecos实时嵌入式操作系统

//==========================================================================
//
//      flashiodev.c
//
//      Flash device interface to I/O subsystem
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos 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 or (at your option) any later version.
//
// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    jlarmour
// Contributors: 
// Date:         2002-01-16
// Purpose:      
// Description:  
//              
//####DESCRIPTIONEND####
//
//==========================================================================

#define _FLASH_PRIVATE_
#include <pkgconf/io_flash.h>

#include <errno.h>
#include <cyg/infra/cyg_type.h>
#include <cyg/io/devtab.h>
#include <cyg/io/config_keys.h>
#include <cyg/io/flash.h>
#include <string.h> // memcpy

#define MIN(x,y) ((x)<(y) ? (x) : (y))

// 1 per devtab entry, so only 1 for now
static char flashiodev_workspaces[1][FLASH_MIN_WORKSPACE];

static int dummy_printf( const char *fmt, ... ) {return 0;}

static bool
flashiodev_init( struct cyg_devtab_entry *tab )
{
    char *ws = (char *)tab->priv;
    int stat = flash_init( ws, FLASH_MIN_WORKSPACE, &dummy_printf );

    if ( stat == 0 )
        return true;
    else
        return false;
} // flashiodev_init()

#if 0
static Cyg_ErrNo
flashiodev_lookup( struct cyg_devtab_entry **tab, 
                   struct cyg_devtab_entry *sub_tab,
                   const char *name)
{   
} // flashiodev_lookup()
#endif

static Cyg_ErrNo
flashiodev_bread( cyg_io_handle_t handle, void *buf, cyg_uint32 *len,
                  cyg_uint32 pos)
{
    char *startpos = (char *)flash_info.start + pos + 
        CYGNUM_IO_FLASH_BLOCK_OFFSET_1;

#ifdef CYGPKG_INFRA_DEBUG // don't bother checking this all the time
    char *endpos = startpos + *len - 1;
    char *flashend = MIN( (char *)flash_info.end,
                          ((char *)flash_info.start + CYGNUM_IO_FLASH_BLOCK_OFFSET_1 + 
                           CYGNUM_IO_FLASH_BLOCK_LENGTH_1));
    if ( startpos < (char *)flash_info.start+CYGNUM_IO_FLASH_BLOCK_OFFSET_1 )
        return -EINVAL;
    if ( endpos > flashend )
        return -EINVAL;
#endif
    memcpy( buf, startpos, *len );
    
    return ENOERR;
} // flashiodev_bread()

static Cyg_ErrNo
flashiodev_bwrite( cyg_io_handle_t handle, const void *buf, cyg_uint32 *len,
                   cyg_uint32 pos )
{   
    Cyg_ErrNo err = ENOERR;
    void *erraddr;

    char *startpos = (char *)flash_info.start + pos + CYGNUM_IO_FLASH_BLOCK_OFFSET_1;

#ifdef CYGPKG_INFRA_DEBUG // don't bother checking this all the time
    char *endpos = startpos + *len - 1;
    char *flashend = MIN( (char *)flash_info.end,
                          ((char *)flash_info.start + CYGNUM_IO_FLASH_BLOCK_OFFSET_1 + 
                           CYGNUM_IO_FLASH_BLOCK_LENGTH_1));
    if ( startpos < (char *)flash_info.start + CYGNUM_IO_FLASH_BLOCK_OFFSET_1 )
        return -EINVAL;
    if ( endpos > flashend )
        return -EINVAL;
#endif
    err = flash_program( startpos, 
                         (void *)buf, *len, &erraddr );

    if ( err )
        err = -EIO; // just something sane
    return err;
} // flashiodev_bwrite()

static Cyg_ErrNo
flashiodev_get_config( cyg_io_handle_t handle,
                       cyg_uint32 key,
                       void* buf,
                       cyg_uint32* len)
{
    switch (key) {
    case CYG_IO_GET_CONFIG_FLASH_ERASE:
    {
        if ( *len != sizeof( cyg_io_flash_getconfig_erase_t ) )
             return -EINVAL;
        {
            cyg_io_flash_getconfig_erase_t *e =
                (cyg_io_flash_getconfig_erase_t *)buf;
            char *startpos = (char *)flash_info.start + e->offset + CYGNUM_IO_FLASH_BLOCK_OFFSET_1;

#ifdef CYGPKG_INFRA_DEBUG // don't bother checking this all the time
            char *endpos = startpos + e->len - 1;
            char *flashend = MIN( (char *)flash_info.end,
                          ((char *)flash_info.start + CYGNUM_IO_FLASH_BLOCK_OFFSET_1 + 
                           CYGNUM_IO_FLASH_BLOCK_LENGTH_1));
            if ( startpos < (char *)flash_info.start + CYGNUM_IO_FLASH_BLOCK_OFFSET_1 )
                return -EINVAL;
            if ( endpos > flashend )
                return -EINVAL;
#endif
            e->flasherr = flash_erase( startpos, e->len, e->err_address );
        }
        return ENOERR;
    }
    case CYG_IO_GET_CONFIG_FLASH_DEVSIZE:
    {
        if ( *len != sizeof( cyg_io_flash_getconfig_devsize_t ) )
             return -EINVAL;
        {
            cyg_io_flash_getconfig_devsize_t *d =
                (cyg_io_flash_getconfig_devsize_t *)buf;

	    //d->dev_size = flash_info.blocks * flash_info.block_size;
	    d->dev_size = CYGNUM_IO_FLASH_BLOCK_LENGTH_1;
        }
        return ENOERR;
    }

    case CYG_IO_GET_CONFIG_FLASH_BLOCKSIZE:
    {
        cyg_io_flash_getconfig_blocksize_t *b =
            (cyg_io_flash_getconfig_blocksize_t *)buf;
        char *startpos = (char *)flash_info.start + CYGNUM_IO_FLASH_BLOCK_OFFSET_1 + b->offset;
#ifdef CYGPKG_INFRA_DEBUG // don't bother checking this all the time
        char *flashend = MIN( (char *)flash_info.end,
                          ((char *)flash_info.start + CYGNUM_IO_FLASH_BLOCK_OFFSET_1 + 
                           CYGNUM_IO_FLASH_BLOCK_LENGTH_1));
        if ( startpos < (char *)flash_info.start + CYGNUM_IO_FLASH_BLOCK_OFFSET_1 )
            return -EINVAL;
        if ( startpos > flashend )
            return -EINVAL;
#endif  
        if ( *len != sizeof( cyg_io_flash_getconfig_blocksize_t ) )
             return -EINVAL;
        
        // offset unused for now
	b->block_size = flash_info.block_size;
        return ENOERR;
    }

    default:
        return -EINVAL;
    }
} // flashiodev_get_config()

#if 0
static Cyg_ErrNo
flashiodev_set_config( cyg_io_handle_t handle,
                       cyg_uint32 key,
                       const void* buf,
                       cyg_uint32* len)
{
    switch (key) {
    default:
        return -EINVAL;
    }
} // flashiodev_set_config()
#endif

// get_config/set_config should be added later to provide the other flash
// operations possible, like erase etc.

BLOCK_DEVIO_TABLE( cyg_io_flashdev1_ops,
                   &flashiodev_bwrite,
                   &flashiodev_bread,
                   0, // no select
                   &flashiodev_get_config,
                   0 // &flashiodev_set_config
    ); 
                   

BLOCK_DEVTAB_ENTRY( cyg_io_flashdev1,
                    CYGDAT_IO_FLASH_BLOCK_DEVICE_NAME_1,
                    0,
                    &cyg_io_flashdev1_ops,
                    &flashiodev_init,
                    0, // No lookup required
                    &flashiodev_workspaces[0] );

// EOF flashiodev.c