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/* *********************************************************************
* Broadcom Common Firmware Environment (CFE)
*
* Flash "self-write" module File: flash_write_all.S
*
* This module takes care of the case of writing to the flash
* memory that CFE is currently reading its code from. It is
* assumed that you'll be doing a complete flash update,
* so this code erases the affected sectors, reprograms them,
* and jumps to the boot sector.
*
* Note: this code is written to be position-independent, even
* for non-PIC versions of CFE! It will be copied (with memcpy)
* into the heap for execution.
*
* Author: Mitch Lichtenberg (mpl@broadcom.com)
*
*********************************************************************
*
* Copyright 2000,2001,2002,2003
* Broadcom Corporation. All rights reserved.
*
* This software is furnished under license and may be used and
* copied only in accordance with the following terms and
* conditions. Subject to these conditions, you may download,
* copy, install, use, modify and distribute modified or unmodified
* copies of this software in source and/or binary form. No title
* or ownership is transferred hereby.
*
* 1) Any source code used, modified or distributed must reproduce
* and retain this copyright notice and list of conditions
* as they appear in the source file.
*
* 2) No right is granted to use any trade name, trademark, or
* logo of Broadcom Corporation. The "Broadcom Corporation"
* name may not be used to endorse or promote products derived
* from this software without the prior written permission of
* Broadcom Corporation.
*
* 3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED
* WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT
* SHALL BROADCOM BE LIABLE FOR ANY DAMAGES WHATSOEVER, AND IN
* PARTICULAR, BROADCOM SHALL NOT BE LIABLE FOR DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE), EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
********************************************************************* */
#include "sbmips.h"
#include "dev_flash.h"
#include "mipsmacros.h"
#define WRITEFLASH(base,offset,value) \
li t0,value ; \
sb t0,offset(base)
/* *********************************************************************
* flash_write_all(data,flashbase,size,secsize)
*
* Write bytes to flash, erasing affected sectors first.
*
* Input parameters:
* a0 - data - pointer to data to write
* a1 - flashbase - base (phys addr) of flash area
* a2 - size - number of bytes to write
* a3 - secsize - flash sector size
*
* Return value:
* does not return
********************************************************************* */
#define data a0
#define flashbase a1
#define datasize a2
#define secsize a3
#define secidx t4
#define secptr t5
LEAF(flash_write_all)
/*
* Mask all interrupts. An exception with BEV set would be very bad.
*/
mfc0 v0,C0_SR # Get current interrupt flag
li v1,M_SR_IE # master interrupt control
not v1 # disable interrupts
and v0,v1 # SR now has IE=0
mtc0 v0,C0_SR # put back into CP0
/*
* Get KSEG1 addr of flash
*/
or flashbase,K1BASE
/*
* Do an "unlock write" sequence (cycles 1-2)
*/
WRITEFLASH(flashbase,AMD_FLASH_MAGIC_ADDR_1,AMD_FLASH_MAGIC_1)
WRITEFLASH(flashbase,AMD_FLASH_MAGIC_ADDR_2,AMD_FLASH_MAGIC_2)
/*
* send the erase command (cycle 3)
*/
WRITEFLASH(flashbase,AMD_FLASH_MAGIC_ADDR_1,AMD_FLASH_ERASE_3)
/*
* Do an "unlock write" sequence (cycles 4-5)
*/
WRITEFLASH(flashbase,AMD_FLASH_MAGIC_ADDR_1,AMD_FLASH_MAGIC_1)
WRITEFLASH(flashbase,AMD_FLASH_MAGIC_ADDR_2,AMD_FLASH_MAGIC_2)
/*
* Send the "erase all" qualifier (cycle 6)
*/
WRITEFLASH(flashbase,AMD_FLASH_MAGIC_ADDR_1,AMD_FLASH_ERASE_ALL_6)
/*
* Wait for the erase to complete
*/
1: lb t0,0(secptr) # get byte
and t0,0xFF # test hi byte
bne t0,0xFF,1b # go till bit is set
/*
* Okay, now loop through the bytes and write them to the
* flash.
*/
move secptr,flashbase
move secidx,datasize
proglp:
/*
* Do an "unlock write" sequence
*/
WRITEFLASH(flashbase,AMD_FLASH_MAGIC_ADDR_1,AMD_FLASH_MAGIC_1)
WRITEFLASH(flashbase,AMD_FLASH_MAGIC_ADDR_2,AMD_FLASH_MAGIC_2)
/*
* Send a program command
*/
WRITEFLASH(flashbase,AMD_FLASH_MAGIC_ADDR_1,AMD_FLASH_PROGRAM)
/*
* Write a byte
*/
lbu t0,0(data)
sb t0,0(secptr) # t0 = byte written to flash
/*
* Wait for write to complete
*/
1: lbu t2,0(secptr) # t2 = byte from flash
and t1,t2,0x80 # done if bit7 of flash
and t0,t0,0x80 # is same as bit7 of data
beq t1,t0,2f
and t1,t2,0x20 # not done if bit5
bne t1,0x20,1b # is still set
2:
/*
* next byte...
*/
add a0,1 # next source byte
add secptr,1 # next dest byte
sub datasize,1 # one less count
bgt datasize,0,proglp
/*
* All done, reboot system
*/
li v0,0xBFC00000
j v0
flash_write_all_end:
nop
END(flash_write_all)
/* *********************************************************************
* Data
********************************************************************* */
.sdata
.globl flash_write_all_ptr
.globl flash_write_all_len
flash_write_all_ptr:
_VECT_ flash_write_all
flash_write_all_len:
.word flash_write_all_end-flash_write_all
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