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clocksource: sti: Provide 'use timer as sched clock' capability

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Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Lee Jones 2015-05-12 13:58:11 +01:00
parent 70bef01c0f
commit ff45d8dd84
1 changed files with 8 additions and 0 deletions
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8
drivers/clocksource/clksrc_st_lpc.c
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@ -16,6 +16,7 @@
#include <linux/clocksource.h> #include <linux/clocksource.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/of_address.h> #include <linux/of_address.h>
#include <linux/sched_clock.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <dt-bindings/mfd/st-lpc.h> #include <dt-bindings/mfd/st-lpc.h>
@ -38,6 +39,11 @@ static void __init st_clksrc_reset(void)
writel_relaxed(1, ddata.base + LPC_LPT_START_OFF); writel_relaxed(1, ddata.base + LPC_LPT_START_OFF);
} }
static u64 notrace st_clksrc_sched_clock_read(void)
{
return (u64)readl_relaxed(ddata.base + LPC_LPT_LSB_OFF);
}
static int __init st_clksrc_init(void) static int __init st_clksrc_init(void)
{ {
unsigned long rate; unsigned long rate;
@ -47,6 +53,8 @@ static int __init st_clksrc_init(void)
rate = clk_get_rate(ddata.clk); rate = clk_get_rate(ddata.clk);
sched_clock_register(st_clksrc_sched_clock_read, 32, rate);
ret = clocksource_mmio_init(ddata.base + LPC_LPT_LSB_OFF, ret = clocksource_mmio_init(ddata.base + LPC_LPT_LSB_OFF,
"clksrc-st-lpc", rate, 300, 32, "clksrc-st-lpc", rate, 300, 32,
clocksource_mmio_readl_up); clocksource_mmio_readl_up);