[PATCH v3 1/2] ARM: pl2x0/pl310: Refactor Kconfig to be more maintainable

Mon Dec 12 06:47:05 EST 2011

Making CACHE_L2X0 depend on (huge list of MACH_ and ARCH_ configs)
is bothersome to maintain and likely to lead to merge conflicts.

This patch moves the knowledge of which platforms have a L2x0 or
PL310 cache controller to the individual machines.  To enable this,
a new HAVE_L2X0_L2CC config option is introduced to allow machines
to indicate that they have such a cache controller independently of
each other.

Boards/SoCs which cannot reliably operate without the L2 cache
controller support should select is directly from their own
Kconfigs instead.  This applies to some TrustZone-enabled boards
where Linux runs in the Normal World.

Signed-off-by: Dave Martin <dave.martin at linaro.org>
---
Changes since v1:

v3: no change (patch reposted as part of an extended series)

v2: Respond to issues raised by Rob Herring:

    Get config dependencies into something resembling alphabetical
    order.
    
    Depend directly on CACHE_L2X0 from boards which run Linux in the
    Normal World and hence where the L2CC can't be turned off by Linux.
    Currently done for OMAP4, EXYNOS4.
    
    Get rid of redundant "default n" for HAVE_L2X0_L2CC

 arch/arm/Kconfig               |    8 ++++++++
 arch/arm/mach-exynos/Kconfig   |    1 +
 arch/arm/mach-imx/Kconfig      |    2 +-
 arch/arm/mach-omap2/Kconfig    |    1 +
 arch/arm/mach-realview/Kconfig |    5 +++++
 arch/arm/mach-vexpress/Kconfig |    1 +
 arch/arm/mm/Kconfig            |   12 +++++++-----
 arch/arm/plat-mxc/Kconfig      |    1 +
 8 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 44789ef..a7e621e 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -344,6 +344,7 @@ config ARCH_HIGHBANK
 	select CPU_V7
 	select GENERIC_CLOCKEVENTS
 	select HAVE_ARM_SCU
+	select HAVE_L2X0_L2CC
 	select USE_OF
 	help
 	  Support for the Calxeda Highbank SoC based boards.
@@ -361,6 +362,7 @@ config ARCH_CNS3XXX
 	select CPU_V6K
 	select GENERIC_CLOCKEVENTS
 	select ARM_GIC
+	select HAVE_L2X0_L2CC
 	select MIGHT_HAVE_PCI
 	select PCI_DOMAINS if PCI
 	help
@@ -377,6 +379,7 @@ config ARCH_GEMINI
 config ARCH_PRIMA2
 	bool "CSR SiRFSoC PRIMA2 ARM Cortex A9 Platform"
 	select CPU_V7
+	select HAVE_L2X0_L2CC
 	select NO_IOPORT
 	select GENERIC_CLOCKEVENTS
 	select CLKDEV_LOOKUP
@@ -632,6 +635,7 @@ config ARCH_TEGRA
 	select GENERIC_CLOCKEVENTS
 	select GENERIC_GPIO
 	select HAVE_CLK
+	select HAVE_L2X0_L2CC
 	select HAVE_SCHED_CLOCK
 	select ARCH_HAS_CPUFREQ
 	help
@@ -701,6 +705,7 @@ config ARCH_SHMOBILE
 	bool "Renesas SH-Mobile / R-Mobile"
 	select HAVE_CLK
 	select CLKDEV_LOOKUP
+	select HAVE_L2X0_L2CC
 	select HAVE_MACH_CLKDEV
 	select GENERIC_CLOCKEVENTS
 	select NO_IOPORT
@@ -900,6 +905,7 @@ config ARCH_U8500
 	bool "ST-Ericsson U8500 Series"
 	select CPU_V7
 	select ARM_AMBA
+	select HAVE_L2X0_L2CC
 	select GENERIC_CLOCKEVENTS
 	select CLKDEV_LOOKUP
 	select ARCH_REQUIRE_GPIOLIB
@@ -912,6 +918,7 @@ config ARCH_NOMADIK
 	select ARM_AMBA
 	select ARM_VIC
 	select CPU_ARM926T
+	select HAVE_L2X0_L2CC
 	select CLKDEV_LOOKUP
 	select GENERIC_CLOCKEVENTS
 	select ARCH_REQUIRE_GPIOLIB
@@ -972,6 +979,7 @@ config ARCH_ZYNQ
 	select CLKDEV_LOOKUP
 	select ARM_GIC
 	select ARM_AMBA
+	select HAVE_L2X0_L2CC
 	select ICST
 	select USE_OF
 	help
diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index 724ec0f..c4c9acf 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -17,6 +17,7 @@ choice
 
 config ARCH_EXYNOS4
 	bool "SAMSUNG EXYNOS4"
+	select CACHE_L2X0
 	help
 	  Samsung EXYNOS4 SoCs based systems
 
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 5f7f9c2..4234937 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -609,12 +609,12 @@ comment "i.MX6 family:"
 config SOC_IMX6Q
 	bool "i.MX6 Quad support"
 	select ARM_GIC
-	select CACHE_L2X0
 	select CPU_V7
 	select HAVE_ARM_SCU
 	select HAVE_IMX_GPC
 	select HAVE_IMX_MMDC
 	select HAVE_IMX_SRC
+	select HAVE_L2X0_L2CC
 	select USE_OF
 
 	help
diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
index 5034147..0358159 100644
--- a/arch/arm/mach-omap2/Kconfig
+++ b/arch/arm/mach-omap2/Kconfig
@@ -44,6 +44,7 @@ config ARCH_OMAP4
 	select CPU_V7
 	select ARM_GIC
 	select LOCAL_TIMERS if SMP
+	select CACHE_L2X0
 	select PL310_ERRATA_588369
 	select PL310_ERRATA_727915
 	select ARM_ERRATA_720789
diff --git a/arch/arm/mach-realview/Kconfig b/arch/arm/mach-realview/Kconfig
index dba6d0c..3dfd6b8 100644
--- a/arch/arm/mach-realview/Kconfig
+++ b/arch/arm/mach-realview/Kconfig
@@ -12,6 +12,7 @@ config REALVIEW_EB_A9MP
 	bool "Support Multicore Cortex-A9 Tile"
 	depends on MACH_REALVIEW_EB
 	select CPU_V7
+	select HAVE_L2X0_L2CC
 	help
 	  Enable support for the Cortex-A9MPCore tile fitted to the
 	  Realview(R) Emulation Baseboard platform.
@@ -20,6 +21,7 @@ config REALVIEW_EB_ARM11MP
 	bool "Support ARM11MPCore Tile"
 	depends on MACH_REALVIEW_EB
 	select CPU_V6K
+	select HAVE_L2X0_L2CC
 	select ARCH_HAS_BARRIERS if SMP
 	help
 	  Enable support for the ARM11MPCore tile fitted to the Realview(R)
@@ -38,6 +40,7 @@ config MACH_REALVIEW_PB11MP
 	bool "Support RealView(R) Platform Baseboard for ARM11MPCore"
 	select CPU_V6K
 	select ARM_GIC
+	select HAVE_L2X0_L2CC
 	select HAVE_PATA_PLATFORM
 	select ARCH_HAS_BARRIERS if SMP
 	help
@@ -50,6 +53,7 @@ config MACH_REALVIEW_PB1176
 	bool "Support RealView(R) Platform Baseboard for ARM1176JZF-S"
 	select CPU_V6
 	select ARM_GIC
+	select HAVE_L2X0_L2CC
 	select HAVE_TCM
 	help
 	  Include support for the ARM(R) RealView(R) Platform Baseboard for
@@ -77,6 +81,7 @@ config MACH_REALVIEW_PBA8
 config MACH_REALVIEW_PBX
 	bool "Support RealView(R) Platform Baseboard Explore"
 	select ARM_GIC
+	select HAVE_L2X0_L2CC
 	select HAVE_PATA_PLATFORM
 	select ARCH_SPARSEMEM_ENABLE if CPU_V7 && !REALVIEW_HIGH_PHYS_OFFSET
 	select ZONE_DMA if SPARSEMEM
diff --git a/arch/arm/mach-vexpress/Kconfig b/arch/arm/mach-vexpress/Kconfig
index 9311484..d9f387e 100644
--- a/arch/arm/mach-vexpress/Kconfig
+++ b/arch/arm/mach-vexpress/Kconfig
@@ -8,5 +8,6 @@ config ARCH_VEXPRESS_CA9X4
 	select ARM_ERRATA_720789
 	select ARM_ERRATA_751472
 	select ARM_ERRATA_753970
+	select HAVE_L2X0_L2CC
 
 endmenu
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 67f75a0..6e9e3e1 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -816,13 +816,15 @@ config CACHE_FEROCEON_L2_WRITETHROUGH
 	  Say Y here to use the Feroceon L2 cache in writethrough mode.
 	  Unless you specifically require this, say N for writeback mode.
 
+config HAVE_L2X0_L2CC
+	bool
+	help
+	  This option should be selected by machines which have a L2x0
+	  or PL310 cache controller.
+
 config CACHE_L2X0
 	bool "Enable the L2x0 outer cache controller"
-	depends on REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || MACH_REALVIEW_PB1176 || \
-		   REALVIEW_EB_A9MP || ARCH_IMX_V6_V7 || MACH_REALVIEW_PBX || \
-		   ARCH_NOMADIK || ARCH_OMAP4 || ARCH_EXYNOS4 || ARCH_TEGRA || \
-		   ARCH_U8500 || ARCH_VEXPRESS_CA9X4 || ARCH_SHMOBILE || \
-		   ARCH_PRIMA2 || ARCH_ZYNQ || ARCH_CNS3XXX || ARCH_HIGHBANK
+	depends on HAVE_L2X0_L2CC
 	default y
 	select OUTER_CACHE
 	select OUTER_CACHE_SYNC
diff --git a/arch/arm/plat-mxc/Kconfig b/arch/arm/plat-mxc/Kconfig
index b3a1f2b..6871ed7 100644
--- a/arch/arm/plat-mxc/Kconfig
+++ b/arch/arm/plat-mxc/Kconfig
@@ -20,6 +20,7 @@ config ARCH_IMX_V6_V7
 	bool "i.MX3, i.MX6"
 	select AUTO_ZRELADDR if !ZBOOT_ROM
 	select ARM_PATCH_PHYS_VIRT
+	select HAVE_L2X0_L2CC
 	help
 	  This enables support for systems based on the Freescale i.MX3 and i.MX6
 	  family.
-- 
1.7.4.1


