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author | Nicolas Pitre <nico@cam.org> | 2005-09-01 12:48:40 +0100 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2005-09-01 12:48:40 +0100 |
commit | 5c53ff088cb76dca52bdf2ef36ea63147763f9ea (patch) | |
tree | d3d740367c93594860087531124213379e7345e4 /arch/arm/mach-pxa/time.c | |
parent | 68d9102f76de7a923fb81c8b6de4764f8f50ed17 (diff) | |
download | kernel_samsung_smdk4412-5c53ff088cb76dca52bdf2ef36ea63147763f9ea.zip kernel_samsung_smdk4412-5c53ff088cb76dca52bdf2ef36ea63147763f9ea.tar.gz kernel_samsung_smdk4412-5c53ff088cb76dca52bdf2ef36ea63147763f9ea.tar.bz2 |
[ARM] 2862/1: VST aka CONFIG_NO_IDLE_HZ support for PXA2xx
Patch from Nicolas Pitre
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-pxa/time.c')
-rw-r--r-- | arch/arm/mach-pxa/time.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/arm/mach-pxa/time.c b/arch/arm/mach-pxa/time.c index 6e52021..72b15e9 100644 --- a/arch/arm/mach-pxa/time.c +++ b/arch/arm/mach-pxa/time.c @@ -70,6 +70,11 @@ static unsigned long pxa_gettimeoffset (void) return usec; } +#ifdef CONFIG_NO_IDLE_HZ +static unsigned long initial_match; +static int match_posponed; +#endif + static irqreturn_t pxa_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs) { @@ -77,6 +82,13 @@ pxa_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs) write_seqlock(&xtime_lock); +#ifdef CONFIG_NO_IDLE_HZ + if (match_posponed) { + match_posponed = 0; + OSMR0 = initial_match; + } +#endif + /* Loop until we get ahead of the free running timer. * This ensures an exact clock tick count and time accuracy. * IRQs are disabled inside the loop to ensure coherence between @@ -126,6 +138,42 @@ static void __init pxa_timer_init(void) OSCR = 0; /* initialize free-running timer, force first match */ } +#ifdef CONFIG_NO_IDLE_HZ +static int pxa_dyn_tick_enable_disable(void) +{ + /* nothing to do */ + return 0; +} + +static void pxa_dyn_tick_reprogram(unsigned long ticks) +{ + if (ticks > 1) { + initial_match = OSMR0; + OSMR0 = initial_match + ticks * LATCH; + match_posponed = 1; + } +} + +static irqreturn_t +pxa_dyn_tick_handler(int irq, void *dev_id, struct pt_regs *regs) +{ + if (match_posponed) { + match_posponed = 0; + OSMR0 = initial_match; + if ( (signed long)(initial_match - OSCR) <= 8 ) + return pxa_timer_interrupt(irq, dev_id, regs); + } + return IRQ_NONE; +} + +static struct dyn_tick_timer pxa_dyn_tick = { + .enable = pxa_dyn_tick_enable_disable, + .disable = pxa_dyn_tick_enable_disable, + .reprogram = pxa_dyn_tick_reprogram, + .handler = pxa_dyn_tick_handler, +}; +#endif + #ifdef CONFIG_PM static unsigned long osmr[4], oier; @@ -161,4 +209,7 @@ struct sys_timer pxa_timer = { .suspend = pxa_timer_suspend, .resume = pxa_timer_resume, .offset = pxa_gettimeoffset, +#ifdef CONFIG_NO_IDLE_HZ + .dyn_tick = &pxa_dyn_tick, +#endif }; |