From f19768ce0e84ac8a1ab03f87784bdf94bf94e140 Mon Sep 17 00:00:00 2001 From: Russell King Date: Mon, 19 Oct 2015 16:00:35 +0100 Subject: ARM: orion: implement ARM delay timer Implement an ARM delay timer to be used for udelay() on orion legacy platforms. This allows us to skip the delay loop calibration at boot. It also means that udelay() will be unaffected by CPU frequency changes when cpufreq is enabled on these platforms. Tested-by: Russell King Acked-by: Andrew Lunn Signed-off-by: Russell King --- arch/arm/plat-orion/time.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'arch/arm/plat-orion') diff --git a/arch/arm/plat-orion/time.c b/arch/arm/plat-orion/time.c index 8085a8aac812..ffb93db68e9c 100644 --- a/arch/arm/plat-orion/time.c +++ b/arch/arm/plat-orion/time.c @@ -18,6 +18,7 @@ #include #include #include +#include /* * MBus bridge block registers. @@ -188,6 +189,15 @@ orion_time_set_base(void __iomem *_timer_base) timer_base = _timer_base; } +static unsigned long orion_delay_timer_read(void) +{ + return ~readl(timer_base + TIMER0_VAL_OFF); +} + +static struct delay_timer orion_delay_timer = { + .read_current_timer = orion_delay_timer_read, +}; + void __init orion_time_init(void __iomem *_bridge_base, u32 _bridge_timer1_clr_mask, unsigned int irq, unsigned int tclk) @@ -202,6 +212,9 @@ orion_time_init(void __iomem *_bridge_base, u32 _bridge_timer1_clr_mask, ticks_per_jiffy = (tclk + HZ/2) / HZ; + orion_delay_timer.freq = tclk; + register_current_timer_delay(&orion_delay_timer); + /* * Set scale and timer for sched_clock. */ -- cgit v1.2.3