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Commit 43d75604 authored by Daniel Lezcano's avatar Daniel Lezcano
Browse files

clocksource/drivers/arc: Convert init function to return error 



The init functions do not return any error. They behave as the following:

  - panic, thus leading to a kernel crash while another timer may work and
       make the system boot up correctly

  or

  - print an error and let the caller unaware if the state of the system

Change that by converting the init functions to return an error conforming
to the CLOCKSOURCE_OF_RET prototype.

Proper error handling (rollback, errno value) will be changed later case
by case, thus this change just return back an error or success in the init
function.

Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
parent 2d9b6506

arch/arc/kernel/time.c

+42 −27
Original line number Diff line number Diff line
@@ -116,21 +116,21 @@ static struct clocksource arc_counter_gfrc = { 
	.flags  = CLOCK_SOURCE_IS_CONTINUOUS,

};



static void __init arc_cs_setup_gfrc(struct device_node *node)

static int __init arc_cs_setup_gfrc(struct device_node *node)

{

	int exists = cpuinfo_arc700[0].extn.gfrc;

	int ret;



	if (WARN(!exists, "Global-64-bit-Ctr clocksource not detected"))

		return;

		return -ENXIO;



	ret = arc_get_timer_clk(node);

	if (ret)

		return;

		return ret;



	clocksource_register_hz(&arc_counter_gfrc, arc_timer_freq);

	return clocksource_register_hz(&arc_counter_gfrc, arc_timer_freq);

}

CLOCKSOURCE_OF_DECLARE(arc_gfrc, "snps,archs-timer-gfrc", arc_cs_setup_gfrc);

CLOCKSOURCE_OF_DECLARE_RET(arc_gfrc, "snps,archs-timer-gfrc", arc_cs_setup_gfrc);



#endif
@@ -172,27 +172,27 @@ static struct clocksource arc_counter_rtc = { 
	.flags  = CLOCK_SOURCE_IS_CONTINUOUS,

};



static void __init arc_cs_setup_rtc(struct device_node *node)

static int __init arc_cs_setup_rtc(struct device_node *node)

{

	int exists = cpuinfo_arc700[smp_processor_id()].extn.rtc;

	int ret;



	if (WARN(!exists, "Local-64-bit-Ctr clocksource not detected"))

		return;

		return -ENXIO;



	/* Local to CPU hence not usable in SMP */

	if (WARN(IS_ENABLED(CONFIG_SMP), "Local-64-bit-Ctr not usable in SMP"))

		return;

		return -EINVAL;



	ret = arc_get_timer_clk(node);

	if (ret)

		return;

		return ret;



	write_aux_reg(AUX_RTC_CTRL, 1);



	clocksource_register_hz(&arc_counter_rtc, arc_timer_freq);

	return clocksource_register_hz(&arc_counter_rtc, arc_timer_freq);

}

CLOCKSOURCE_OF_DECLARE(arc_rtc, "snps,archs-timer-rtc", arc_cs_setup_rtc);

CLOCKSOURCE_OF_DECLARE_RET(arc_rtc, "snps,archs-timer-rtc", arc_cs_setup_rtc);



#endif
@@ -213,23 +213,23 @@ static struct clocksource arc_counter_timer1 = { 
	.flags  = CLOCK_SOURCE_IS_CONTINUOUS,

};



static void __init arc_cs_setup_timer1(struct device_node *node)

static int __init arc_cs_setup_timer1(struct device_node *node)

{

	int ret;



	/* Local to CPU hence not usable in SMP */

	if (IS_ENABLED(CONFIG_SMP))

		return;

		return -EINVAL;



	ret = arc_get_timer_clk(node);

	if (ret)

		return;

		return ret;



	write_aux_reg(ARC_REG_TIMER1_LIMIT, ARC_TIMER_MAX);

	write_aux_reg(ARC_REG_TIMER1_CNT, 0);

	write_aux_reg(ARC_REG_TIMER1_CTRL, TIMER_CTRL_NH);



	clocksource_register_hz(&arc_counter_timer1, arc_timer_freq);

	return clocksource_register_hz(&arc_counter_timer1, arc_timer_freq);

}



/********** Clock Event Device *********/
@@ -324,20 +324,28 @@ static struct notifier_block arc_timer_cpu_nb = { 
/*

 * clockevent setup for boot CPU

 */

static void __init arc_clockevent_setup(struct device_node *node)

static int __init arc_clockevent_setup(struct device_node *node)

{

	struct clock_event_device *evt = this_cpu_ptr(&arc_clockevent_device);

	int ret;



	register_cpu_notifier(&arc_timer_cpu_nb);

	ret = register_cpu_notifier(&arc_timer_cpu_nb);

	if (ret) {

		pr_err("Failed to register cpu notifier");

		return ret;

	}



	arc_timer_irq = irq_of_parse_and_map(node, 0);

	if (arc_timer_irq <= 0)

		panic("clockevent: missing irq");

	if (arc_timer_irq <= 0) {

		pr_err("clockevent: missing irq");

		return -EINVAL;

	}



	ret = arc_get_timer_clk(node);

	if (ret)

		panic("clockevent: missing clk");

	if (ret) {

		pr_err("clockevent: missing clk");

		return ret;

	}



	evt->irq = arc_timer_irq;

	evt->cpumask = cpumask_of(smp_processor_id());
@@ -347,24 +355,31 @@ static void __init arc_clockevent_setup(struct device_node *node) 
	/* Needs apriori irq_set_percpu_devid() done in intc map function */

	ret = request_percpu_irq(arc_timer_irq, timer_irq_handler,

				 "Timer0 (per-cpu-tick)", evt);

	if (ret)

		panic("clockevent: unable to request irq\n");

	if (ret) {

		pr_err("clockevent: unable to request irq\n");

		return ret;

	}



	enable_percpu_irq(arc_timer_irq, 0);



	return 0;

}



static void __init arc_of_timer_init(struct device_node *np)

static int __init arc_of_timer_init(struct device_node *np)

{

	static int init_count = 0;

	int ret;



	if (!init_count) {

		init_count = 1;

		arc_clockevent_setup(np);

		ret = arc_clockevent_setup(np);

	} else {

		arc_cs_setup_timer1(np);

		ret = arc_cs_setup_timer1(np);

	}



	return ret;

}

CLOCKSOURCE_OF_DECLARE(arc_clkevt, "snps,arc-timer", arc_of_timer_init);

CLOCKSOURCE_OF_DECLARE_RET(arc_clkevt, "snps,arc-timer", arc_of_timer_init);



/*

 * Called from start_kernel() - boot CPU only