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From: cvs at opencores.org<cvs@o...>
Date: Tue Jan 29 03:13:31 CET 2008
Subject: [cvs-checkins] MODIFIED: mlite ...
Date: 00/08/01 29:03:13

Added: mlite/kernel flash.c
Log:
Flash controller


Revision Changes Path
1.1 mlite/kernel/flash.c

http://www.opencores.org/cvsweb.shtml/mlite/kernel/flash.c?rev=1.1&content-type=text/x-cvsweb-markup

Index: flash.c
===================================================================
/*--------------------------------------------------------------------
* TITLE: Plasma Flash
* AUTHOR: Steve Rhoads (rhoadss@y...)
* DATE CREATED: 12/17/05
* FILENAME: plasma.h
* PROJECT: Plasma CPU core
* COPYRIGHT: Software placed into the public domain by the author.
* Software 'as is' without warranty. Author liable for nothing.
* DESCRIPTION:
* Plasma flash controller
* Only the lower 16-bits of each 32-bit word are connected --
* this changes the address mapping to the flash.
* ByteOffset and bytes must be a multiple of two.
*--------------------------------------------------------------------*/
#include "plasma.h"
#include "rtos.h"


void FlashRead(uint16 *dst, uint32 byteOffset, int bytes)
{
volatile uint32 *ptr=(uint32*)(FLASH_BASE + (byteOffset << 1));
*ptr = 0xff; //read mode
while(bytes > 0)
{
*dst++ = (uint16)*ptr++;
bytes -= 2;
}
}


void FlashWrite(uint16 *src, uint32 byteOffset, int bytes)
{
volatile uint32 *ptr=(uint32*)(FLASH_BASE + (byteOffset << 1));
while(bytes > 0)
{
*ptr = 0x40; //write mode
*ptr++ = *src++; //write data
while((*ptr & 0x80) == 0) //check status
;
bytes -= 2;
}
}


void FlashErase(uint32 byteOffset)
{
volatile uint32 *ptr=(uint32*)(FLASH_BASE + (byteOffset << 1));
*ptr = 0x20; //erase block
*ptr = 0xd0; //confirm
while((*ptr & 0x80) == 0) //check status
;
}