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imxrt-flash: fast read fix for ISSI NOR flash
ISSI NOR chips use selecteble dummy cycles to support fast read command. For 133 MHz fast read should include 11 dummy cycles (default is 6). To set correct number of dummy cycles: - FCFB and flexspi_init() use 60 MHz clock and normal read - add custom ISSI commands and nor_issiInit() - add flexspi_postinit() which switches to final 133 MHz clock DONE: RTOS-128
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Original file line number | Diff line number | Diff line change |
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/* | ||
* Phoenix-RTOS | ||
* | ||
* Operating system loader | ||
* | ||
* i.MX RT nor flash device driver | ||
* ISSI Specific | ||
* | ||
* Copyright 2024 Phoenix Systems | ||
* Authors: Ziemowit Leszczynski | ||
* | ||
* This file is part of Phoenix-RTOS. | ||
* | ||
* %LICENSE% | ||
*/ | ||
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#include <lib/lib.h> | ||
#include <devices/devs.h> | ||
#include "../fspi.h" | ||
#include "../lut.h" | ||
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#include "flash.h" | ||
#include "nor.h" | ||
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__attribute__((section(".noxip"))) int nor_issiInit(struct nor_device *dev) | ||
{ | ||
int res; | ||
struct xferOp xfer; | ||
u8 status, params; | ||
const time_t timeout = 1000; | ||
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if (dev->active == 0) { | ||
return -ENODEV; | ||
} | ||
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/* Load only the necessary commands to enable quad mode and set dummy cycles. */ | ||
flexspi_lutUpdateEntries(&dev->fspi, fspi_readStatus * LUT_SEQSZ, dev->nor->lut + fspi_readStatus, 1, LUT_SEQSZ); | ||
flexspi_lutUpdateEntries(&dev->fspi, fspi_writeStatus * LUT_SEQSZ, dev->nor->lut + fspi_writeStatus, 1, LUT_SEQSZ); | ||
flexspi_lutUpdateEntries(&dev->fspi, fspi_writeEnable * LUT_SEQSZ, dev->nor->lut + fspi_writeEnable, 1, LUT_SEQSZ); | ||
flexspi_lutUpdateEntries(&dev->fspi, fspi_cmdCustom1 * LUT_SEQSZ, dev->nor->lut + fspi_cmdCustom1, 1, LUT_SEQSZ); | ||
flexspi_lutUpdateEntries(&dev->fspi, fspi_cmdCustom2 * LUT_SEQSZ, dev->nor->lut + fspi_cmdCustom2, 1, LUT_SEQSZ); | ||
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res = nor_readStatus(&dev->fspi, dev->port, &status, timeout); | ||
if (res < EOK) { | ||
return res; | ||
} | ||
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if ((status & (1uL << 6u)) == 0uL) { | ||
res = nor_writeEnable(&dev->fspi, dev->port, 1, timeout); | ||
if (res < EOK) { | ||
return res; | ||
} | ||
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/* Quad Enable */ | ||
status |= (1uL << 6u); | ||
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xfer.op = xfer_opWrite; | ||
xfer.port = dev->port; | ||
xfer.timeout = timeout; | ||
xfer.addr = 0; | ||
xfer.seqIdx = LUT_SEQIDX(fspi_writeStatus); | ||
xfer.seqNum = LUT_SEQNUM(fspi_writeStatus); | ||
xfer.data.write.ptr = &status; | ||
xfer.data.write.sz = 1; | ||
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res = flexspi_xferExec(&dev->fspi, &xfer); | ||
if (res < EOK) { | ||
return res; | ||
} | ||
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res = nor_waitBusy(&dev->fspi, dev->port, timeout); | ||
if (res < EOK) { | ||
return res; | ||
} | ||
} | ||
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xfer.op = xfer_opRead; | ||
xfer.port = dev->port; | ||
xfer.timeout = timeout; | ||
xfer.addr = 0; | ||
xfer.seqIdx = LUT_SEQIDX(fspi_cmdCustom1); | ||
xfer.seqNum = LUT_SEQNUM(fspi_cmdCustom1); | ||
xfer.data.read.ptr = ¶ms; | ||
xfer.data.read.sz = 1; | ||
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res = flexspi_xferExec(&dev->fspi, &xfer); | ||
if (res < EOK) { | ||
return res; | ||
} | ||
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if (((params & 0x87) >> 3u) != 11) { | ||
/* 11 dummy cycles */ | ||
params = (params & 0x87) | (11uL << 3u); | ||
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xfer.op = xfer_opWrite; | ||
xfer.port = dev->port; | ||
xfer.timeout = timeout; | ||
xfer.addr = 0; | ||
xfer.seqIdx = LUT_SEQIDX(fspi_cmdCustom2); | ||
xfer.seqNum = LUT_SEQNUM(fspi_cmdCustom2); | ||
xfer.data.read.ptr = ¶ms; | ||
xfer.data.write.sz = 1; | ||
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res = flexspi_xferExec(&dev->fspi, &xfer); | ||
if (res < EOK) { | ||
return res; | ||
} | ||
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res = nor_waitBusy(&dev->fspi, dev->port, timeout); | ||
if (res < EOK) { | ||
return res; | ||
} | ||
} | ||
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/* Change initial normal read command to fast read with new dummy cycles before going back to XIP. */ | ||
flexspi_lutUpdateEntries(&dev->fspi, fspi_readData * LUT_SEQSZ, dev->nor->lut + fspi_readData, 1, LUT_SEQSZ); | ||
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return EOK; | ||
} |
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