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784502aeae
NOR memory only supports setting bits to 1. To clear a bit, set to zero, the NOR memory needs to be erased. Change-Id: Ia82eb15a5af9a6d4fc7e5ea2b58e6db87226b351 Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
/*
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* Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef __NORFLASH_H_
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#define __NORFLASH_H_
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#include <stdint.h>
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/* First bus cycle */
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#define NOR_CMD_READ_ARRAY 0xFF
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#define NOR_CMD_READ_ID_CODE 0x90
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#define NOR_CMD_READ_QUERY 0x98
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#define NOR_CMD_READ_STATUS_REG 0x70
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#define NOR_CMD_CLEAR_STATUS_REG 0x50
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#define NOR_CMD_WRITE_TO_BUFFER 0xE8
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#define NOR_CMD_WORD_PROGRAM 0x40
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#define NOR_CMD_BLOCK_ERASE 0x20
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#define NOR_CMD_LOCK_UNLOCK 0x60
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#define NOR_CMD_BLOCK_ERASE_ACK 0xD0
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/* Second bus cycle */
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#define NOR_LOCK_BLOCK 0x01
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#define NOR_UNLOCK_BLOCK 0xD0
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/* Status register bits */
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#define NOR_DWS (1 << 7)
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#define NOR_ESS (1 << 6)
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#define NOR_ES (1 << 5)
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#define NOR_PS (1 << 4)
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#define NOR_VPPS (1 << 3)
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#define NOR_PSS (1 << 2)
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#define NOR_BLS (1 << 1)
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#define NOR_BWS (1 << 0)
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/* Public API */
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void nor_send_cmd(uintptr_t base_addr, unsigned long cmd);
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int nor_word_program(uintptr_t base_addr, unsigned long data);
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int nor_lock(uintptr_t base_addr);
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int nor_unlock(uintptr_t base_addr);
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int nor_erase(uintptr_t base_addr);
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#endif /* __NORFLASH_H_ */
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