diff options
| author | David Abdurachmanov <david.abdurachmanov@sifive.com> | 2021-07-20 19:02:39 +0200 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2021-07-27 15:29:59 +0530 |
| commit | 217d5e488033c7337b80794563b2f13e29b9f88d (patch) | |
| tree | b61008dcee29bea3367b19f610dd7835e1e7df4b | |
| parent | 74db0acbe5de8c82cc3ae050d6bd119f33dce4cf (diff) | |
generic: fu740: add workaround for CIP-1200 errata
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>
| -rw-r--r-- | platform/generic/objects.mk | 1 | ||||
| -rw-r--r-- | platform/generic/platform.c | 2 | ||||
| -rw-r--r-- | platform/generic/sifive_fu740.c | 36 |
3 files changed, 39 insertions, 0 deletions
diff --git a/platform/generic/objects.mk b/platform/generic/objects.mk index d6c8a42..cb15a18 100644 --- a/platform/generic/objects.mk +++ b/platform/generic/objects.mk @@ -9,3 +9,4 @@ platform-objs-y += platform.o platform-objs-y += sifive_fu540.o +platform-objs-y += sifive_fu740.o diff --git a/platform/generic/platform.c b/platform/generic/platform.c index 0787d10..0757d87 100644 --- a/platform/generic/platform.c +++ b/platform/generic/platform.c @@ -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; diff --git a/platform/generic/sifive_fu740.c b/platform/generic/sifive_fu740.c new file mode 100644 index 0000000..c8325d3 --- /dev/null +++ b/platform/generic/sifive_fu740.c @@ -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, +}; |