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authorRich Felker <dalias@libc.org>2016-03-17 23:09:37 +0000
committerRich Felker <dalias@libc.org>2016-08-05 03:29:31 +0000
commit5a846abad07f6f30adfa3e46c5c7a47d2e7b1e63 (patch)
treefc16a7c8f74a2010f0134ef3e69d20fde929bc08 /arch/sh/Kconfig
parentsh: fix build regression with CONFIG_OF && !CONFIG_OF_FLATTREE (diff)
downloadlinux-dev-5a846abad07f6f30adfa3e46c5c7a47d2e7b1e63.tar.xz
linux-dev-5a846abad07f6f30adfa3e46c5c7a47d2e7b1e63.zip
sh: add support for J-Core J2 processor
At the CPU/ISA level, the J2 is compatible with SH-2, and thus the changes to add J2 support build on existing SH-2 support. However, J2 does not duplicate the memory-mapped SH-2 features like the cache interface. Instead, the cache interfaces is described in the device tree, and new code is added to be able to access the flat device tree at early boot before it is unflattened. Support is also added for receiving interrupts on trap numbers in the range 16 to 31, since the J-Core aic1 interrupt controller generates these traps. This range was unused but nominally for hardware exceptions on SH-2, and a few values in this range were used for exceptions on SH-2A, but SH-2A has its own version of the relevant code. No individual cpu subtypes are added for J2 since the intent moving forward is to represent SoCs with device tree rather than as hard-coded subtypes in the kernel. The CPU_SUBTYPE_J2 Kconfig item exists only to fit into the existing cpu selection mechanism until it is overhauled. Signed-off-by: Rich Felker <dalias@libc.org>
Diffstat (limited to '')
-rw-r--r--arch/sh/Kconfig10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index df6339d7bf72..2ef6f652bc50 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -186,6 +186,12 @@ config CPU_SH2A
select CPU_SH2
select UNCACHED_MAPPING
+config CPU_J2
+ bool
+ select CPU_SH2
+ select OF
+ select OF_EARLY_FLATTREE
+
config CPU_SH3
bool
select CPU_HAS_INTEVT
@@ -252,6 +258,10 @@ config CPU_SUBTYPE_SH7619
select CPU_SH2
select SYS_SUPPORTS_SH_CMT
+config CPU_SUBTYPE_J2
+ bool "Support J2 processor"
+ select CPU_J2
+
# SH-2A Processor Support
config CPU_SUBTYPE_SH7201