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91 lines
1.4 KiB
91 lines
1.4 KiB
/*++
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Copyright (c) 1995 Digital Equipment Corporation
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Module Name:
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pflash.c
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Abstract:
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This module contains the platform dependent code to access the AMD
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flash ROM part
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Author:
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Wim Colgate, 5/23/95
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Environment:
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Firmware/Kernel mode
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Revision History:
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--*/
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#include "halp.h"
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#include "arccodes.h"
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#include <flash8k.h>
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#include "flashbus.h"
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#include "am29f400.h"
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VOID pWriteFlashByte(
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IN ULONG FlashOffset,
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IN UCHAR Data
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)
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/*++
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Routine Description:
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This routine goes writes the flashbus using the hardware
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specific access method.
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Arguments:
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FlashOffset - offset within the flash ROM.
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Data - data to write
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Return Value:
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The value of the flash at the given location.
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--*/
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{
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WRITE_EPIC_REGISTER(FLASH_ACCESS_ADDR,
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(FlashOffset << FLASH_ADDR_SHIFT) | Data
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| FLASH_WRITE_FLAG);
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}
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UCHAR pReadFlashByte(
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IN ULONG FlashOffset
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)
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/*++
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Routine Description:
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This routine goes out and reads the flashbus using the hardware
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specific access method.
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Arguments:
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FlashOffset - offset within the flash ROM.
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Return Value:
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The value of the flash at the given location.
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--*/
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{
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ULONG ReturnVal;
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WRITE_EPIC_REGISTER(FLASH_ACCESS_ADDR,
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(FlashOffset << FLASH_ADDR_SHIFT));
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ReturnVal = READ_EPIC_REGISTER(FLASH_ACCESS_ADDR);
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return (UCHAR)ReturnVal;
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}
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