[RFC v5.1 6/9] cache,soc: Move SiFive CCache driver & create drivers/cache

From: Conor Dooley <conor@kernel.org>
To: conor@kernel.org, arnd@arndb.de, palmer@dabbelt.com,
	prabhakar.csengg@gmail.com
Cc: Conor Dooley <conor.dooley@microchip.com>,
	ajones@ventanamicro.com, aou@eecs.berkeley.edu,
	apatel@ventanamicro.com, atishp@rivosinc.com,
	biju.das.jz@bp.renesas.com, devicetree@vger.kernel.org,
	geert@linux-m68k.org, guoren@kernel.org, hch@infradead.org,
	heiko@sntech.de, jszhang@kernel.org,
	krzysztof.kozlowski+dt@linaro.org, linux-kernel@vger.kernel.org,
	linux-renesas-soc@vger.kernel.org,
	linux-riscv@lists.infradead.org, magnus.damm@gmail.com,
	nathan@kernel.org, paul.walmsley@sifive.com,
	philipp.tomsich@vrull.eu,
	prabhakar.mahadev-lad.rj@bp.renesas.com, robh+dt@kernel.org,
	samuel@sholland.org, soc@kernel.org
Subject: [RFC v5.1 6/9] cache,soc: Move SiFive CCache driver & create drivers/cache
Date: Tue,  3 Jan 2023 21:03:58 +0000	[thread overview]
Message-ID: <20230103210400.3500626-7-conor@kernel.org> (raw)
In-Reply-To: <Y62nOqzyuUKqYDpq@spud>

From: Conor Dooley <conor.dooley@microchip.com>

The Zicbo* set of extensions for cache maintenance arrived too late &
several SoCs exist without them that require non-coherent DMA.
As things stand, the StarFive JH7100, Microchip PolarFire SoC & Renesas
RZ/Five all require cache maintenance and lack instructions for this
purpose.
Create a subsystem for cache drivers so that vendor specific behaviour
can be isolated from arch code, but keep the interfaces etc consistent.
Move the existing SiFive CCache driver to create drivers/cache.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---
 MAINTAINERS                                   | 15 ++++++++-------
 drivers/Kconfig                               |  2 ++
 drivers/Makefile                              |  2 ++
 drivers/{soc/sifive => cache}/Kconfig         |  8 +++++++-
 drivers/{soc/sifive => cache}/Makefile        |  0
 drivers/{soc/sifive => cache}/sifive_ccache.c |  2 +-
 drivers/edac/sifive_edac.c                    |  2 +-
 drivers/soc/Kconfig                           |  1 -
 drivers/soc/Makefile                          |  1 -
 include/{soc/sifive => cache}/sifive_ccache.h |  0
 10 files changed, 21 insertions(+), 12 deletions(-)
 rename drivers/{soc/sifive => cache}/Kconfig (56%)
 rename drivers/{soc/sifive => cache}/Makefile (100%)
 rename drivers/{soc/sifive => cache}/sifive_ccache.c (99%)
 rename include/{soc/sifive => cache}/sifive_ccache.h (100%)

diff --git a/MAINTAINERS b/MAINTAINERS
index f61eb221415b..4437e96a657b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19054,13 +19054,6 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/dma/sifive,fu540-c000-pdma.yaml
 F:	drivers/dma/sf-pdma/
 
-SIFIVE SOC DRIVERS
-M:	Conor Dooley <conor@kernel.org>
-L:	linux-riscv@lists.infradead.org
-S:	Maintained
-T:	git https://git.kernel.org/pub/scm/linux/kernel/git/conor/linux.git/
-F:	drivers/soc/sifive/
-
 SILEAD TOUCHSCREEN DRIVER
 M:	Hans de Goede <hdegoede@redhat.com>
 L:	linux-input@vger.kernel.org
@@ -19873,6 +19866,14 @@ S:	Supported
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
 F:	drivers/staging/
 
+STANDALONE CACHE CONTROLLER DRIVERS
+M:	Conor Dooley <conor@kernel.org>
+L:	linux-riscv@lists.infradead.org
+S:	Maintained
+T:	git https://git.kernel.org/pub/scm/linux/kernel/git/conor/linux.git/
+F:	drivers/cache
+F:	include/cache
+
 STARFIRE/DURALAN NETWORK DRIVER
 M:	Ion Badulescu <ionut@badula.org>
 S:	Odd Fixes
diff --git a/drivers/Kconfig b/drivers/Kconfig
index 968bd0a6fd78..e592ba5276ae 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -241,4 +241,6 @@ source "drivers/peci/Kconfig"
 
 source "drivers/hte/Kconfig"
 
+source "drivers/cache/Kconfig"
+
 endmenu
diff --git a/drivers/Makefile b/drivers/Makefile
index bdf1c66141c9..6ff60cf21823 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -38,6 +38,8 @@ obj-y				+= clk/
 # really early.
 obj-$(CONFIG_DMADEVICES)	+= dma/
 
+obj-y				+= cache/
+
 # SOC specific infrastructure drivers.
 obj-y				+= soc/
 
diff --git a/drivers/soc/sifive/Kconfig b/drivers/cache/Kconfig
similarity index 56%
rename from drivers/soc/sifive/Kconfig
rename to drivers/cache/Kconfig
index ed4c571f8771..bc852f005c10 100644
--- a/drivers/soc/sifive/Kconfig
+++ b/drivers/cache/Kconfig
@@ -1,9 +1,15 @@
 # SPDX-License-Identifier: GPL-2.0
 
-if SOC_SIFIVE
+menuconfig CACHE_CONTROLLER
+	bool "Cache controller driver support"
+	default y if RISCV
+
+if CACHE_CONTROLLER
 
 config SIFIVE_CCACHE
 	bool "Sifive Composable Cache controller"
+	depends on RISCV
+	default y
 	help
 	  Support for the composable cache controller on SiFive platforms.
 
diff --git a/drivers/soc/sifive/Makefile b/drivers/cache/Makefile
similarity index 100%
rename from drivers/soc/sifive/Makefile
rename to drivers/cache/Makefile
diff --git a/drivers/soc/sifive/sifive_ccache.c b/drivers/cache/sifive_ccache.c
similarity index 99%
rename from drivers/soc/sifive/sifive_ccache.c
rename to drivers/cache/sifive_ccache.c
index 3684f5b40a80..47e7d6557f85 100644
--- a/drivers/soc/sifive/sifive_ccache.c
+++ b/drivers/cache/sifive_ccache.c
@@ -15,7 +15,7 @@
 #include <linux/device.h>
 #include <linux/bitfield.h>
 #include <asm/cacheinfo.h>
-#include <soc/sifive/sifive_ccache.h>
+#include <cache/sifive_ccache.h>
 
 #define SIFIVE_CCACHE_DIRECCFIX_LOW 0x100
 #define SIFIVE_CCACHE_DIRECCFIX_HIGH 0x104
diff --git a/drivers/edac/sifive_edac.c b/drivers/edac/sifive_edac.c
index b844e2626fd5..9276839d58c2 100644
--- a/drivers/edac/sifive_edac.c
+++ b/drivers/edac/sifive_edac.c
@@ -10,7 +10,7 @@
 #include <linux/edac.h>
 #include <linux/platform_device.h>
 #include "edac_module.h"
-#include <soc/sifive/sifive_ccache.h>
+#include <cache/sifive_ccache.h>
 
 #define DRVNAME "sifive_edac"
 
diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
index 5dbb09f843f7..240455963565 100644
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -21,7 +21,6 @@ source "drivers/soc/qcom/Kconfig"
 source "drivers/soc/renesas/Kconfig"
 source "drivers/soc/rockchip/Kconfig"
 source "drivers/soc/samsung/Kconfig"
-source "drivers/soc/sifive/Kconfig"
 source "drivers/soc/sunxi/Kconfig"
 source "drivers/soc/tegra/Kconfig"
 source "drivers/soc/ti/Kconfig"
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index fff513bd522d..9ed2e27bbb64 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -27,7 +27,6 @@ obj-y				+= qcom/
 obj-y				+= renesas/
 obj-y				+= rockchip/
 obj-$(CONFIG_SOC_SAMSUNG)	+= samsung/
-obj-$(CONFIG_SOC_SIFIVE)	+= sifive/
 obj-y				+= sunxi/
 obj-$(CONFIG_ARCH_TEGRA)	+= tegra/
 obj-y				+= ti/
diff --git a/include/soc/sifive/sifive_ccache.h b/include/cache/sifive_ccache.h
similarity index 100%
rename from include/soc/sifive/sifive_ccache.h
rename to include/cache/sifive_ccache.h
-- 
2.39.0

