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Commit f712a1e8 authored by Alexandre Belloni's avatar Alexandre Belloni Committed by Daniel Lezcano
Browse files

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: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
parent 86232bfd

drivers/clocksource/tcb_clksrc.c

+16 −0
Original line number Diff line number Diff line
@@ -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: