From 84904d0ead0a8c419abd45c7b2ac8d76d50a0d48 Mon Sep 17 00:00:00 2001 From: Kevin Hilman Date: Fri, 22 Sep 2006 00:58:57 +0100 Subject: [PATCH] [ARM] 3856/1: Add clocksource for Intel IXP4xx platforms Enables the ixp4xx platforms to use Generic time-of-day. Signed-off-by: Kevin Hilman Acked-by: John Stultz Signed-off-by: Deepak Saxena Signed-off-by: Russell King --- arch/arm/Kconfig | 1 + arch/arm/mach-ixp4xx/common.c | 38 ++++++++++++++++++-------- arch/arm/mach-ixp4xx/nslu2-setup.c | 2 ++ include/asm-arm/arch-ixp4xx/platform.h | 5 ++++ 4 files changed, 35 insertions(+), 11 deletions(-) diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 314ac6ba0ec..147abe0383d 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -226,6 +226,7 @@ config ARCH_IOP33X config ARCH_IXP4XX bool "IXP4xx-based" depends on MMU + select GENERIC_TIME help Support for Intel's IXP4XX (XScale) family of processors. diff --git a/arch/arm/mach-ixp4xx/common.c b/arch/arm/mach-ixp4xx/common.c index 7c25dbd5a18..35dd8b3824b 100644 --- a/arch/arm/mach-ixp4xx/common.c +++ b/arch/arm/mach-ixp4xx/common.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include @@ -255,16 +256,6 @@ static unsigned volatile last_jiffy_time; #define CLOCK_TICKS_PER_USEC ((CLOCK_TICK_RATE + USEC_PER_SEC/2) / USEC_PER_SEC) -/* IRQs are disabled before entering here from do_gettimeofday() */ -static unsigned long ixp4xx_gettimeoffset(void) -{ - u32 elapsed; - - elapsed = *IXP4XX_OSTS - last_jiffy_time; - - return elapsed / CLOCK_TICKS_PER_USEC; -} - static irqreturn_t ixp4xx_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs) { write_seqlock(&xtime_lock); @@ -309,7 +300,6 @@ static void __init ixp4xx_timer_init(void) struct sys_timer ixp4xx_timer = { .init = ixp4xx_timer_init, - .offset = ixp4xx_gettimeoffset, }; static struct resource ixp46x_i2c_resources[] = { @@ -365,3 +355,29 @@ void __init ixp4xx_sys_init(void) ixp4xx_exp_bus_size >> 20); } +cycle_t ixp4xx_get_cycles(void) +{ + return *IXP4XX_OSTS; +} + +static struct clocksource clocksource_ixp4xx = { + .name = "OSTS", + .rating = 200, + .read = ixp4xx_get_cycles, + .mask = CLOCKSOURCE_MASK(32), + .shift = 20, + .is_continuous = 1, +}; + +unsigned long ixp4xx_timer_freq = FREQ; +static int __init ixp4xx_clocksource_init(void) +{ + clocksource_ixp4xx.mult = + clocksource_hz2mult(ixp4xx_timer_freq, + clocksource_ixp4xx.shift); + clocksource_register(&clocksource_ixp4xx); + + return 0; +} + +device_initcall(ixp4xx_clocksource_init); diff --git a/arch/arm/mach-ixp4xx/nslu2-setup.c b/arch/arm/mach-ixp4xx/nslu2-setup.c index 749a337494d..162c266e5f8 100644 --- a/arch/arm/mach-ixp4xx/nslu2-setup.c +++ b/arch/arm/mach-ixp4xx/nslu2-setup.c @@ -159,6 +159,8 @@ static void nslu2_power_off(void) static void __init nslu2_init(void) { + ixp4xx_timer_freq = NSLU2_FREQ; + ixp4xx_sys_init(); nslu2_flash_resource.start = IXP4XX_EXP_BUS_BASE(0); diff --git a/include/asm-arm/arch-ixp4xx/platform.h b/include/asm-arm/arch-ixp4xx/platform.h index 13aee17b047..8d10a918769 100644 --- a/include/asm-arm/arch-ixp4xx/platform.h +++ b/include/asm-arm/arch-ixp4xx/platform.h @@ -89,6 +89,11 @@ struct ixp4xx_i2c_pins { struct sys_timer; +/* + * Frequency of clock used for primary clocksource + */ +extern unsigned long ixp4xx_timer_freq; + /* * Functions used by platform-level setup code */ -- 2.41.0