diff options
Diffstat (limited to 'cfe/cfe/arch/mips/common/src/dev_flash_all.S')
| -rw-r--r-- | cfe/cfe/arch/mips/common/src/dev_flash_all.S | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/cfe/cfe/arch/mips/common/src/dev_flash_all.S b/cfe/cfe/arch/mips/common/src/dev_flash_all.S new file mode 100644 index 0000000..6dbb581 --- /dev/null +++ b/cfe/cfe/arch/mips/common/src/dev_flash_all.S @@ -0,0 +1,220 @@ +/* ********************************************************************* + * 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 + + |