a29f040_v2erase.c

来自「qnx powerpc MPC8245的 BSP源文件」· C语言 代码 · 共 91 行

/*
 * $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: 2 only
 * Bus Width:   16-bit only
 *
 * Description
 *
 * This erase callout is for 16-bit flash only.
 */

int f3s_a29f040_v2erase(f3s_dbase_t *dbase,
                        f3s_access_t *access,
                        uint32_t flags,
                        uint32_t offset)
{
	volatile uint8_t *	memory;
	uintptr_t			amd_cmd1;
	uintptr_t			amd_cmd2;
	F3S_BASETYPE		mask3 = (1 << 3) * flashcfg.device_mult;
	F3S_BASETYPE		mask6 = (1 << 6) * flashcfg.device_mult;
	F3S_BASETYPE		status, status2;

	/* Obtain pointer to the sector */
	memory = access->service->page(&access->socket, F3S_POWER_ALL, offset & amd_command_mask, NULL);
	if (memory == NULL) {
		fprintf(stderr, "(devf  t%d::%s:%d) page() returned NULL for offset 0x%x\n",
					pthread_self(), __func__, __LINE__, offset);
		return (errno);
	}

	/* The command address is always 16-bits */
	amd_cmd1 = AMD_CMD_ADDR1_W16 * flashcfg.bus_width;
	amd_cmd2 = AMD_CMD_ADDR2_W16 * flashcfg.bus_width;

	/* Issue unlock cycles */
	send_command(memory + amd_cmd1, AMD_UNLOCK_CMD1);
	send_command(memory + amd_cmd2, AMD_UNLOCK_CMD2);

	/* Issue erase command */
	send_command(memory + amd_cmd1, AMD_SECTOR_ERASE);

	/* Issue unlock cycles */
	send_command(memory + amd_cmd1, AMD_UNLOCK_CMD1);
	send_command(memory + amd_cmd2, AMD_UNLOCK_CMD2);

	/* Issue erase confirm */
	send_command(memory, AMD_ERASE_CONFIRM);

	/* If DQ6 is toggling the command was accepted */
	do {
		status  = readmem(memory);
		status2 = readmem(memory);
	} while(!((status ^ status2) & mask6)); 
		
	
	/* Wait for DQ3 to go high */
	do {
		status = readmem(memory);
	} while ((status & mask3) != mask3);

	return (EOK);
}