From f5339277eb8d3aed37f12a27988366f68ab68930 Mon Sep 17 00:00:00 2001 From: Stephen Rothwell Date: Thu, 15 Mar 2012 18:18:00 +0000 Subject: powerpc: Remove FW_FEATURE ISERIES from arch code This is no longer selectable, so just remove all the dependent code. Signed-off-by: Stephen Rothwell Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/kernel/time.c | 108 ++------------------------------------------- 1 file changed, 3 insertions(+), 105 deletions(-) (limited to 'arch/powerpc/kernel/time.c') diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index f81c81b92f0..2c42cd72d0f 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -17,8 +17,7 @@ * * TODO (not necessarily in this file): * - improve precision and reproducibility of timebase frequency - * measurement at boot time. (for iSeries, we calibrate the timebase - * against the Titan chip's clock.) + * measurement at boot time. * - for astronomical applications: add a new function to get * non ambiguous timestamps even around leap seconds. This needs * a new timestamp format and a good name. @@ -70,10 +69,6 @@ #include #include #include -#ifdef CONFIG_PPC_ISERIES -#include -#include -#endif /* powerpc clocksource/clockevent code */ @@ -117,14 +112,6 @@ static struct clock_event_device decrementer_clockevent = { DEFINE_PER_CPU(u64, decrementers_next_tb); static DEFINE_PER_CPU(struct clock_event_device, decrementers); -#ifdef CONFIG_PPC_ISERIES -static unsigned long __initdata iSeries_recal_titan; -static signed long __initdata iSeries_recal_tb; - -/* Forward declaration is only needed for iSereis compiles */ -static void __init clocksource_init(void); -#endif - #define XSEC_PER_SEC (1024*1024) #ifdef CONFIG_PPC64 @@ -423,74 +410,6 @@ unsigned long profile_pc(struct pt_regs *regs) EXPORT_SYMBOL(profile_pc); #endif -#ifdef CONFIG_PPC_ISERIES - -/* - * This function recalibrates the timebase based on the 49-bit time-of-day - * value in the Titan chip. The Titan is much more accurate than the value - * returned by the service processor for the timebase frequency. - */ - -static int __init iSeries_tb_recal(void) -{ - unsigned long titan, tb; - - /* Make sure we only run on iSeries */ - if (!firmware_has_feature(FW_FEATURE_ISERIES)) - return -ENODEV; - - tb = get_tb(); - titan = HvCallXm_loadTod(); - if ( iSeries_recal_titan ) { - unsigned long tb_ticks = tb - iSeries_recal_tb; - unsigned long titan_usec = (titan - iSeries_recal_titan) >> 12; - unsigned long new_tb_ticks_per_sec = (tb_ticks * USEC_PER_SEC)/titan_usec; - unsigned long new_tb_ticks_per_jiffy = - DIV_ROUND_CLOSEST(new_tb_ticks_per_sec, HZ); - long tick_diff = new_tb_ticks_per_jiffy - tb_ticks_per_jiffy; - char sign = '+'; - /* make sure tb_ticks_per_sec and tb_ticks_per_jiffy are consistent */ - new_tb_ticks_per_sec = new_tb_ticks_per_jiffy * HZ; - - if ( tick_diff < 0 ) { - tick_diff = -tick_diff; - sign = '-'; - } - if ( tick_diff ) { - if ( tick_diff < tb_ticks_per_jiffy/25 ) { - printk( "Titan recalibrate: new tb_ticks_per_jiffy = %lu (%c%ld)\n", - new_tb_ticks_per_jiffy, sign, tick_diff ); - tb_ticks_per_jiffy = new_tb_ticks_per_jiffy; - tb_ticks_per_sec = new_tb_ticks_per_sec; - calc_cputime_factors(); - vdso_data->tb_ticks_per_sec = tb_ticks_per_sec; - setup_cputime_one_jiffy(); - } - else { - printk( "Titan recalibrate: FAILED (difference > 4 percent)\n" - " new tb_ticks_per_jiffy = %lu\n" - " old tb_ticks_per_jiffy = %lu\n", - new_tb_ticks_per_jiffy, tb_ticks_per_jiffy ); - } - } - } - iSeries_recal_titan = titan; - iSeries_recal_tb = tb; - - /* Called here as now we know accurate values for the timebase */ - clocksource_init(); - return 0; -} -late_initcall(iSeries_tb_recal); - -/* Called from platform early init */ -void __init iSeries_time_init_early(void) -{ - iSeries_recal_tb = get_tb(); - iSeries_recal_titan = HvCallXm_loadTod(); -} -#endif /* CONFIG_PPC_ISERIES */ - #ifdef CONFIG_IRQ_WORK /* @@ -546,16 +465,6 @@ void arch_irq_work_raise(void) #endif /* CONFIG_IRQ_WORK */ -/* - * For iSeries shared processors, we have to let the hypervisor - * set the hardware decrementer. We set a virtual decrementer - * in the lppaca and call the hypervisor if the virtual - * decrementer is less than the current value in the hardware - * decrementer. (almost always the new decrementer value will - * be greater than the current hardware decementer so the hypervisor - * call will not be needed) - */ - /* * timer_interrupt - gets called when the decrementer overflows, * with interrupts disabled. @@ -599,20 +508,10 @@ void timer_interrupt(struct pt_regs * regs) irq_work_run(); } -#ifdef CONFIG_PPC_ISERIES - if (firmware_has_feature(FW_FEATURE_ISERIES)) - get_lppaca()->int_dword.fields.decr_int = 0; -#endif - *next_tb = ~(u64)0; if (evt->event_handler) evt->event_handler(evt); -#ifdef CONFIG_PPC_ISERIES - if (firmware_has_feature(FW_FEATURE_ISERIES) && hvlpevent_is_pending()) - process_hvlpevents(); -#endif - #ifdef CONFIG_PPC64 /* collect purr register values often, for accurate calculations */ if (firmware_has_feature(FW_FEATURE_SPLPAR)) { @@ -984,9 +883,8 @@ void __init time_init(void) */ start_cpu_decrementer(); - /* Register the clocksource, if we're not running on iSeries */ - if (!firmware_has_feature(FW_FEATURE_ISERIES)) - clocksource_init(); + /* Register the clocksource */ + clocksource_init(); init_decrementer_clockevent(); } -- cgit v1.2.2