linux-kernel - [PATCH v2 1/8] riscv: errata: Add StarFive JH7100 errata

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Message-Id: <20231130151932.729708-2-emil.renner.berthing@canonical.com>
Date:   Thu, 30 Nov 2023 16:19:25 +0100
From:   Emil Renner Berthing <emil.renner.berthing@...onical.com>
To:     linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Emil Renner Berthing <kernel@...il.dk>,
        Conor Dooley <conor@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Conor Dooley <conor.dooley@...rochip.com>
Subject: [PATCH v2 1/8] riscv: errata: Add StarFive JH7100 errata

This not really an errata, but since the JH7100 was made before
the standard Zicbom extension it needs the DMA_GLOBAL_POOL and
RISCV_NONSTANDARD_CACHE_OPS enabled to work correctly.

Acked-by: Conor Dooley <conor.dooley@...rochip.com>
Signed-off-by: Emil Renner Berthing <emil.renner.berthing@...onical.com>
---
 arch/riscv/Kconfig.errata | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/arch/riscv/Kconfig.errata b/arch/riscv/Kconfig.errata
index e2c731cfed8c..692de149141f 100644
--- a/arch/riscv/Kconfig.errata
+++ b/arch/riscv/Kconfig.errata
@@ -53,6 +53,23 @@ config ERRATA_SIFIVE_CIP_1200
 
 	  If you don't know what to do here, say "Y".
 
+config ERRATA_STARFIVE_JH7100
+	bool "StarFive JH7100 support"
+	depends on ARCH_STARFIVE && NONPORTABLE
+	select DMA_GLOBAL_POOL
+	select RISCV_DMA_NONCOHERENT
+	select RISCV_NONSTANDARD_CACHE_OPS
+	select SIFIVE_CCACHE
+	default n
+	help
+	  The StarFive JH7100 was a test chip for the JH7110 and has
+	  caches that are non-coherent with respect to peripheral DMAs.
+	  It was designed before the Zicbom extension so needs non-standard
+	  cache operations through the SiFive cache controller.
+
+	  Say "Y" if you want to support the BeagleV Starlight and/or
+	  StarFive VisionFive V1 boards.
+
 config ERRATA_THEAD
 	bool "T-HEAD errata"
 	depends on RISCV_ALTERNATIVE
-- 
2.40.1