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| author |   Alexandre Belloni <alexandre.belloni@bootlin.com> | 2019-04-26 23:47:12 +0200 |
|---|---|---|
| committer |   Daniel Lezcano <daniel.lezcano@linaro.org> | 2019-05-02 21:55:58 +0200 |
| commit | f712a1e8e59e8f42b5a9ec3887a4ad079bb18175 (patch) | |
| tree | aa753707d19573143e78a9104fdefbda19c8ea4e | |
| parent | clocksource/drivers/tcb_clksrc: Stop depending on atmel_tclib (diff) | |
| download | linux-dev-f712a1e8e59e8f42b5a9ec3887a4ad079bb18175.tar.xz linux-dev-f712a1e8e59e8f42b5a9ec3887a4ad079bb18175.zip | |
clocksource/drivers/tcb_clksrc: Use tcb as sched_clock
Now that the driver is registered early enough, use the TCB as the
sched_clock which is much more accurate than the jiffies implementation.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
| -rw-r--r-- | drivers/clocksource/tcb_clksrc.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c index bf68504da94a..9de8c10ab546 100644 --- a/drivers/clocksource/tcb_clksrc.c +++ b/drivers/clocksource/tcb_clksrc.c @@ -11,6 +11,7 @@ #include <linux/io.h> #include <linux/of_address.h> #include <linux/of_irq.h> +#include <linux/sched_clock.h> #include <linux/syscore_ops.h> #include <soc/at91/atmel_tcb.h> @@ -114,6 +115,16 @@ static struct clocksource clksrc = { .resume = tc_clksrc_resume, }; +static u64 notrace tc_sched_clock_read(void) +{ + return tc_get_cycles(&clksrc); +} + +static u64 notrace tc_sched_clock_read32(void) +{ + return tc_get_cycles32(&clksrc); +} + #ifdef CONFIG_GENERIC_CLOCKEVENTS struct tc_clkevt_device { @@ -335,6 +346,7 @@ static int __init tcb_clksrc_init(struct device_node *node) struct atmel_tc tc; struct clk *t0_clk; const struct of_device_id *match; + u64 (*tc_sched_clock)(void); u32 rate, divided_rate = 0; int best_divisor_idx = -1; int clk32k_divisor_idx = -1; @@ -419,6 +431,7 @@ static int __init tcb_clksrc_init(struct device_node *node) clksrc.read = tc_get_cycles32; /* setup ony channel 0 */ tcb_setup_single_chan(&tc, best_divisor_idx); + tc_sched_clock = tc_sched_clock_read32; } else { /* we have three clocks no matter what the * underlying platform supports. @@ -430,6 +443,7 @@ static int __init tcb_clksrc_init(struct device_node *node) } /* setup both channel 0 & 1 */ tcb_setup_dual_chan(&tc, best_divisor_idx); + tc_sched_clock = tc_sched_clock_read; } /* and away we go! */ @@ -442,6 +456,8 @@ static int __init tcb_clksrc_init(struct device_node *node) if (ret) goto err_unregister_clksrc; + sched_clock_register(tc_sched_clock, 32, divided_rate); + return 0; err_unregister_clksrc: |