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authorLinus Torvalds <torvalds@linux-foundation.org>2014-01-25 22:49:30 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-25 22:49:30 +0400
commit9b83d851a2bdd021e2135999e5bce3eb8fef94e6 (patch)
treeb8703e813b1d8d66fb262cd757f54f3c05966d50 /arch/xtensa/Kconfig
parent2d08cd0ef89a24f5eb6c6801c48cd06bca230d6d (diff)
parent9ed82c6866e2ab671935a75ea454047e8bddb177 (diff)
downloadlinux-9b83d851a2bdd021e2135999e5bce3eb8fef94e6.tar.xz
Merge tag 'xtensa-next-20140123' of git://github.com/czankel/xtensa-linux
Pull Xtensa patches from Chris Zankel: "The major changes are adding support for SMP for Xtensa, fixing and cleaning up the ISS (simulator) network driver, and better support for device trees" * tag 'xtensa-next-20140123' of git://github.com/czankel/xtensa-linux: (40 commits) xtensa: implement ndelay xtensa: clean up udelay xtensa: enable HAVE_PERF_EVENTS xtensa: remap io area defined in device tree xtensa: support default device tree buses xtensa: initialize device tree clock sources xtensa: xtfpga: fix definitions of platform devices xtensa: standardize devicetree cpu compatible strings xtensa: avoid duplicate of IO range definitions xtensa: fix ATOMCTL register documentation xtensa: Enable irqs after cpu is set online xtensa: ISS: raise network polling rate to 10 times/sec xtensa: remove unused XTENSA_ISS_NETWORK Kconfig parameter xtensa: ISS: avoid simple_strtoul usage xtensa: Switch to sched_clock_register() xtensa: implement CPU hotplug xtensa: add SMP support xtensa: add MX irqchip xtensa: clear timer IRQ unconditionally in its handler xtensa: clean up do_interrupt/do_IRQ ...
Diffstat (limited to 'arch/xtensa/Kconfig')
-rw-r--r--arch/xtensa/Kconfig52
1 files changed, 47 insertions, 5 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index f8df0cc70cb6..ba56e11cbf77 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
@@ -19,6 +18,8 @@ config XTENSA
select IRQ_DOMAIN
select HAVE_OPROFILE
select HAVE_FUNCTION_TRACER
+ select HAVE_IRQ_TIME_ACCOUNTING
+ select HAVE_PERF_EVENTS
help
Xtensa processors are 32-bit RISC machines designed by Tensilica
primarily for embedded systems. These processors are both
@@ -67,6 +68,9 @@ config VARIANT_IRQ_SWITCH
config HAVE_XTENSA_GPIO32
def_bool n
+config MAY_HAVE_SMP
+ def_bool n
+
menu "Processor type and features"
choice
@@ -110,6 +114,48 @@ 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 HOTPLUG_CPU
+ bool "Enable CPU hotplug support"
+ depends on SMP
+ help
+ Say Y here to allow turning CPUs off and on. CPUs can be
+ controlled through /sys/devices/system/cpu.
+
+ Say N if you want to disable CPU hotplug.
+
config MATH_EMULATION
bool "Math emulation"
help
@@ -156,9 +202,6 @@ config XTENSA_CALIBRATE_CCOUNT
config SERIAL_CONSOLE
def_bool n
-config XTENSA_ISS_NETWORK
- def_bool n
-
menu "Bus options"
config PCI
@@ -185,7 +228,6 @@ config XTENSA_PLATFORM_ISS
depends on TTY
select XTENSA_CALIBRATE_CCOUNT
select SERIAL_CONSOLE
- select XTENSA_ISS_NETWORK
help
ISS is an acronym for Tensilica's Instruction Set Simulator.