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generic: fu740: add workaround for CIP-1200 errata

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Instruction TLB can fail to respect a non-global SFENCE thus we need to
flush the TLB using SFENCE.VMA x0, x0

See full description of CIP-1200 in Errata_FU740-C000_20210205 from
https://www.sifive.com/boards/hifive-unmatched

Signed-off-by: David Abdurachmanov <david.abdurachmanov@sifive.com>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit is contained in:
David Abdurachmanov
2021-07-20 19:02:39 +02:00
committed by Anup Patel
parent 74db0acbe5
commit 217d5e4880
3 changed files with 39 additions and 0 deletions
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1
platform/generic/objects.mk
View File

@@ -9,3 +9,4 @@
platform-objs-y += platform.o
platform-objs-y += sifive_fu540.o
platform-objs-y += sifive_fu740.o

2
platform/generic/platform.c
View File

@@ -24,9 +24,11 @@
#include <sbi_utils/reset/fdt_reset.h>
extern const struct platform_override sifive_fu540;
extern const struct platform_override sifive_fu740;
static const struct platform_override *special_platforms[] = {
&sifive_fu540,
&sifive_fu740,
};
static const struct platform_override *generic_plat = NULL;

36
platform/generic/sifive_fu740.c Normal file
View File

@@ -0,0 +1,36 @@
/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2021 SiFive
*
* Authors:
* David Abdurachmanov <david.abdurachmanov@sifive.com>
*/
#include <platform_override.h>
#include <sbi_utils/fdt/fdt_helper.h>
#include <sbi_utils/fdt/fdt_fixup.h>
static u64 sifive_fu740_tlbr_flush_limit(const struct fdt_match *match)
{
/*
* Needed to address CIP-1200 errata on SiFive FU740
* Title: Instruction TLB can fail to respect a non-global SFENCE
* Workaround: Flush the TLB using SFENCE.VMA x0, x0
* See Errata_FU740-C000_20210205 from
* https://www.sifive.com/boards/hifive-unmatched
*/
return 0;
}
static const struct fdt_match sifive_fu740_match[] = {
{ .compatible = "sifive,fu740" },
{ .compatible = "sifive,fu740-c000" },
{ .compatible = "sifive,hifive-unmatched-a00" },
{ },
};
const struct platform_override sifive_fu740 = {
.match_table = sifive_fu740_match,
.tlbr_flush_limit = sifive_fu740_tlbr_flush_limit,
};