From 35e71f90687fd904b43e3427673827ac3e77b4d1 Mon Sep 17 00:00:00 2001 From: Chris Zankel Date: Thu, 16 Apr 2009 00:25:39 -0700 Subject: xtensa: Fix architecture specific Kconfig Move a misplace endmenu marker to enable platform options and disable PCI and automatic calibrating for the XT2K board. The on-board PCI bridge is somewhat broken, anyway, and the calibrating relies on some whacky usage of the serial port. Signed-off-by: Chris Zankel --- arch/xtensa/Kconfig | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) (limited to 'arch/xtensa/Kconfig') diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index fa6dc4dd3b19..30d21a9e2ef5 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -137,6 +137,8 @@ config PCI source "drivers/pci/Kconfig" +endmenu + menu "Platform options" choice @@ -153,8 +155,6 @@ config XTENSA_PLATFORM_ISS config XTENSA_PLATFORM_XT2000 bool "XT2000" - select XTENSA_CALIBRATE_CCOUNT - select PCI help XT2000 is the name of Tensilica's feature-rich emulation platform. This hardware is capable of running a full Linux distribution. @@ -192,8 +192,6 @@ config CMDLINE source "mm/Kconfig" -endmenu - config HOTPLUG bool "Support for hot-pluggable devices" help -- cgit v1.2.3 From b070a03f6490b0ac8d95c51b55a64e433d9160ab Mon Sep 17 00:00:00 2001 From: Oskar Schirmer Date: Mon, 11 May 2009 15:43:36 +0200 Subject: xtensa: implement ccount calibration for s6000 Calculate core frequency from timers at boot time instead of assuming a fixed frequency. This is useful as the true frequency is set up by the boot loader, thus variable. Signed-off-by: Oskar Schirmer Signed-off-by: Chris Zankel --- arch/xtensa/Kconfig | 1 + arch/xtensa/variants/s6000/Makefile | 1 + arch/xtensa/variants/s6000/delay.c | 27 +++++++++++++++++++++++++++ 3 files changed, 29 insertions(+) create mode 100644 arch/xtensa/variants/s6000/delay.c (limited to 'arch/xtensa/Kconfig') diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index 30d21a9e2ef5..ebe228d02b08 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -80,6 +80,7 @@ config XTENSA_VARIANT_S6000 bool "s6000 - Stretch software configurable processor" select VARIANT_IRQ_SWITCH select ARCH_REQUIRE_GPIOLIB + select XTENSA_CALIBRATE_CCOUNT endchoice config XTENSA_UNALIGNED_USER diff --git a/arch/xtensa/variants/s6000/Makefile b/arch/xtensa/variants/s6000/Makefile index 03b3975468bd..d83f3805130c 100644 --- a/arch/xtensa/variants/s6000/Makefile +++ b/arch/xtensa/variants/s6000/Makefile @@ -1,3 +1,4 @@ # s6000 Makefile obj-y += irq.o gpio.o +obj-$(CONFIG_XTENSA_CALIBRATE_CCOUNT) += delay.o diff --git a/arch/xtensa/variants/s6000/delay.c b/arch/xtensa/variants/s6000/delay.c new file mode 100644 index 000000000000..54b2b573f166 --- /dev/null +++ b/arch/xtensa/variants/s6000/delay.c @@ -0,0 +1,27 @@ +#include +#include +#include +#include + +#define LOOPS 10 +void platform_calibrate_ccount(void) +{ + u32 uninitialized_var(a); + u32 uninitialized_var(u); + u32 b; + u32 tstamp = S6_REG_GREG1 + S6_GREG1_GLOBAL_TIMER; + int i = LOOPS+1; + do { + u32 t = u; + asm volatile( + "1: l32i %0, %2, 0 ;" + " beq %0, %1, 1b ;" + : "=&a"(u) : "a"(t), "a"(tstamp)); + b = xtensa_get_ccount(); + if (i == LOOPS) + a = b; + } while (--i >= 0); + b -= a; + nsec_per_ccount = (LOOPS * 10000) / b; + ccount_per_jiffy = b * (100000UL / (LOOPS * HZ)); +} -- cgit v1.2.3