101 lines
2.2 KiB
C
101 lines
2.2 KiB
C
/*
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* Copyright (c) 2015, 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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#include <errno.h>
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#include <mmio.h>
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#include <norflash.h>
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/* Helper macros to access two flash banks in parallel */
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#define NOR_2X16(d) ((d << 16) | (d & 0xffff))
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/*
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* DWS ready poll retries. The number of retries in this driver have been
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* obtained empirically from Juno. FVP implements a zero wait state NOR flash
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* model
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*/
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#define DWS_WORD_PROGRAM_RETRIES 1000
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/*
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* Poll Write State Machine. Return values:
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* 0 = WSM ready
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* -EBUSY = WSM busy after the number of retries
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*/
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static int nor_poll_dws(uintptr_t base_addr, unsigned int retries)
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{
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uint32_t status;
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int ret;
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for (;;) {
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nor_send_cmd(base_addr, NOR_CMD_READ_STATUS_REG);
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status = mmio_read_32(base_addr);
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if ((status & NOR_DWS) &&
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(status & (NOR_DWS << 16))) {
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ret = 0;
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break;
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}
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if (retries-- == 0) {
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ret = -EBUSY;
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break;
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}
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}
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return ret;
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}
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void nor_send_cmd(uintptr_t base_addr, unsigned long cmd)
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{
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mmio_write_32(base_addr, NOR_2X16(cmd));
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}
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/*
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* Return values:
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* 0 = success
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* -EBUSY = WSM not ready
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* -EPERM = Device protected or Block locked
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*/
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int nor_word_program(uintptr_t base_addr, unsigned long data)
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{
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uint32_t status;
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int ret;
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/* Set the device in write word mode */
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nor_send_cmd(base_addr, NOR_CMD_WORD_PROGRAM);
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mmio_write_32(base_addr, data);
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ret = nor_poll_dws(base_addr, DWS_WORD_PROGRAM_RETRIES);
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if (ret != 0) {
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goto word_program_end;
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}
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/* Full status check */
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nor_send_cmd(base_addr, NOR_CMD_READ_STATUS_REG);
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status = mmio_read_32(base_addr);
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if (status & (NOR_PS | NOR_BLS)) {
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nor_send_cmd(base_addr, NOR_CMD_CLEAR_STATUS_REG);
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ret = -EPERM;
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}
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word_program_end:
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nor_send_cmd(base_addr, NOR_CMD_READ_ARRAY);
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return ret;
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}
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void nor_lock(uintptr_t base_addr)
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{
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nor_send_cmd(base_addr, NOR_CMD_LOCK_UNLOCK);
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mmio_write_32(base_addr, NOR_2X16(NOR_LOCK_BLOCK));
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nor_send_cmd(base_addr, NOR_CMD_READ_ARRAY);
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}
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void nor_unlock(uintptr_t base_addr)
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{
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nor_send_cmd(base_addr, NOR_CMD_LOCK_UNLOCK);
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mmio_write_32(base_addr, NOR_2X16(NOR_UNLOCK_BLOCK));
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nor_send_cmd(base_addr, NOR_CMD_READ_ARRAY);
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}
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