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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-10-19 16:00:35 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2016-01-26 23:45:05 +0000 |
| commit | f19768ce0e84ac8a1ab03f87784bdf94bf94e140 (patch) | |
| tree | 5841678d336dbe49cc19f3d7f5c3052fa1e33ae6 /arch | |
| parent | 92e963f50fc74041b5e9e744c330dca48e04f08d (diff) | |
| download | linux-f19768ce0e84ac8a1ab03f87784bdf94bf94e140.tar.bz2 | |
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 <rmk+kernel@arm.linux.org.uk>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/plat-orion/time.c | 13 |
1 files changed, 13 insertions, 0 deletions
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 <linux/irq.h> #include <linux/sched_clock.h> #include <plat/time.h> +#include <asm/delay.h> /* * 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. */ |