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authorMax Filippov <jcmvbkbc@gmail.com>2013-10-17 02:42:26 +0400
committerChris Zankel <chris@zankel.net>2014-01-14 10:19:58 -0800
commitf615136c06a791364f5afa8b8ba965315a6440f1 (patch)
treed9ced4cfdfd13438ce23384fbd64006bb74fd8b6 /arch/xtensa/Kconfig
parent26a8e96a8b37e8070fa9dcb1b7490cf4d4492d50 (diff)
xtensa: add SMP support
This is largely based on SMP code from the xtensa-2.6.29-smp tree by Piet Delaney, Marc Gauthier, Joe Taylor, Christian Zankel (and possibly other Tensilica folks). Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
Diffstat (limited to 'arch/xtensa/Kconfig')
-rw-r--r--arch/xtensa/Kconfig37
1 files changed, 36 insertions, 1 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index fb140ae3860d..4b09c60b6b30 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -9,7 +9,6 @@ config XTENSA
select GENERIC_CLOCKEVENTS
select VIRT_TO_BUS
select GENERIC_IRQ_SHOW
- select GENERIC_CPU_DEVICES
select GENERIC_SCHED_CLOCK
select MODULES_USE_ELF_RELA
select GENERIC_PCI_IOMAP
@@ -65,6 +64,9 @@ config MMU
config VARIANT_IRQ_SWITCH
def_bool n
+config MAY_HAVE_SMP
+ def_bool n
+
menu "Processor type and features"
choice
@@ -105,6 +107,39 @@ config XTENSA_UNALIGNED_USER
source "kernel/Kconfig.preempt"
+config HAVE_SMP
+ bool "System Supports SMP (MX)"
+ depends on MAY_HAVE_SMP
+ select XTENSA_MX
+ help
+ This option is use to indicate that the system-on-a-chip (SOC)
+ supports Multiprocessing. Multiprocessor support implemented above
+ the CPU core definition and currently needs to be selected manually.
+
+ Multiprocessor support in implemented with external cache and
+ interrupt controlers.
+
+ The MX interrupt distributer adds Interprocessor Interrupts
+ and causes the IRQ numbers to be increased by 4 for devices
+ like the open cores ethernet driver and the serial interface.
+
+ You still have to select "Enable SMP" to enable SMP on this SOC.
+
+config SMP
+ bool "Enable Symmetric multi-processing support"
+ depends on HAVE_SMP
+ select USE_GENERIC_SMP_HELPERS
+ select GENERIC_SMP_IDLE_THREAD
+ help
+ Enabled SMP Software; allows more than one CPU/CORE
+ to be activated during startup.
+
+config NR_CPUS
+ depends on SMP
+ int "Maximum number of CPUs (2-32)"
+ range 2 32
+ default "4"
+
config MATH_EMULATION
bool "Math emulation"
help