amb_sync.c

qnx powerpc MPC8245的 BSP源文件

/*
 * $QNXLicenseC: 
 * Copyright 2007, QNX Software Systems.  
 *  
 * Licensed under the Apache License, Version 2.0 (the "License"). You  
 * may not reproduce, modify or distribute this software 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 OF ANY KIND, either express or implied. 
 * 
 * This file may contain contributions from others, either as  
 * contributors under the License or as licensors under other terms.   
 * Please review this entire file for other proprietary rights or license  
 * notices, as well as the QNX Development Suite License Guide at  
 * http://licensing.qnx.com/license-guide/ for other information. 
 * $ 
 */


#include <pthread.h>
#include <sys/f3s_mtd.h>

/*
 * Summary
 *
 * MTD Version: 1 only
 * Bus Width:   8-bit and 16-bit
 * Boot-Block?: Yes
 * Note:        For early generation MirrorBit parts with known errata.
 *
 * Description
 *
 * This sync callout is for early generation MirrorBit parts that have several
 * known defects. Please contact your AMD representative for more details. The
 * f3s_aMB_*() callouts implement software workarounds to these errata, they
 * should be used as a matched set.
 */

int32_t f3s_aMB_sync(f3s_dbase_t *dbase,
                     f3s_access_t *access,
                     uint32_t flags,
                     uint32_t offset,
                     int32_t size)
{
	uint32_t	i;
	uint32_t	temp;
	int			error;

	/* Just a subset of the corresponding v2 function */
	error = f3s_aMB_v2sync(dbase, access, flags, offset);
	if (error) {
		if (error == EAGAIN) return (0);

		if (error == EIO) {
			/* Try erase again */
			f3s_aMB_v2erase(dbase, access, 0, offset);

			/* Pretend erase never finished */
			return (0);
		}

		errno = error;
		return (-1);
	}

	/* Compute sector size */
	i    = 0;
	temp = 0;
	while (1) {
		temp += dbase->geo_vect[i].unit_num << dbase->geo_vect[i].unit_pow2;

		if (offset < temp) {
			return (1 << dbase->geo_vect[i].unit_pow2);
		}

		i++;
		if (i >= dbase->geo_num) i = 0;
	}

	/* If we ever get here, this is bad */
	fprintf(stderr, "(devf  t%d::%s:%d) inconsistant geometry. offset = 0x%x, temp = 0x%x\n",
				pthread_self(), __func__, __LINE__, offset, temp);
	errno = EIO;
	return (-1);
}