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Subject[PATCH 2/2] clockevents: migrate some drivers to new ->set_dev_mode()
Date
From: Viresh Kumar <viresh.kumar@linaro.org>

Clockevents core now supports ->set_dev_mode() (as a replacement to
->set_mode()), with capability to return error codes.

This patch migrates few clockevent drivers to the new method to demonstrate how
to convert to the new interface.

Drivers are modified to return -ENOSYS when requested to switch to unsupported
mode and return 0 on success. This patch shouldn't result in any other
functional change in drivers.

Most of the changes are automated with help of Coccinelle
(http://coccinelle.lip6.fr/) and the ones left are around the switch
block which are handled manually. Some additional changes (like
adding 'int ret = 0' and 'return ret') as well as whitespace fixups
were also done manually after coccinelle.

A simplified version of the semantic patch is:

// <smpl>
@@
identifier m,c,setmode;
@@
-void
+int
setmode(enum clock_event_mode m, struct clock_event_device *c);

@@
identifier setmode;
@@
-void
+int
setmode(enum clock_event_mode, struct clock_event_device *);

@fixret@
identifier m,c,setmode;
@@
-void
+int
setmode(enum clock_event_mode m, struct clock_event_device *c)
{
...
+ return 0;
}

@depends on fixret@
identifier ced;
identifier fixret.setmode;
@@
... struct clock_event_device ced = {
...,
-.set_mode
+.set_dev_mode
= setmode,
};

@depends on fixret@
expression ced;
identifier fixret.setmode;
@@
- ced->set_mode
+ ced->set_dev_mode
= setmode

@depends on fixret@
identifier fixret.setmode;
@@
{
.
-set_mode
+set_dev_mode
= setmode
}

@depends on fixret@
expression ced;
identifier fixret.setmode;
@@
- ced.set_mode
+ ced.set_dev_mode
= setmode

// </smpl>

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
[khilman: rework changelog, minor formatting, checkpatch cleanups]
Signed-off-by: Kevin Hilman <khilman@linaro.org>
---
drivers/clocksource/arm_arch_timer.c | 46 +++++++++++++++++---------------
drivers/clocksource/bcm2835_timer.c | 10 +++----
drivers/clocksource/bcm_kona_timer.c | 15 ++++++++---
drivers/clocksource/i8253.c | 11 +++++---
drivers/clocksource/time-armada-370-xp.c | 21 +++++++++++----
5 files changed, 65 insertions(+), 38 deletions(-)

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 5163ec13429d..e139776be034 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -179,8 +179,8 @@ static irqreturn_t arch_timer_handler_virt_mem(int irq, void *dev_id)
return timer_handler(ARCH_TIMER_MEM_VIRT_ACCESS, evt);
}

-static __always_inline void timer_set_mode(const int access, int mode,
- struct clock_event_device *clk)
+static __always_inline int timer_set_mode(const int access, int mode,
+ struct clock_event_device *clk)
{
unsigned long ctrl;
switch (mode) {
@@ -190,33 +190,37 @@ static __always_inline void timer_set_mode(const int access, int mode,
ctrl &= ~ARCH_TIMER_CTRL_ENABLE;
arch_timer_reg_write(access, ARCH_TIMER_REG_CTRL, ctrl, clk);
break;
- default:
+ case CLOCK_EVT_MODE_ONESHOT:
+ case CLOCK_EVT_MODE_RESUME:
break;
+ default:
+ return -ENOSYS;
}
+ return 0;
}

-static void arch_timer_set_mode_virt(enum clock_event_mode mode,
- struct clock_event_device *clk)
+static int arch_timer_set_mode_virt(enum clock_event_mode mode,
+ struct clock_event_device *clk)
{
- timer_set_mode(ARCH_TIMER_VIRT_ACCESS, mode, clk);
+ return timer_set_mode(ARCH_TIMER_VIRT_ACCESS, mode, clk);
}

-static void arch_timer_set_mode_phys(enum clock_event_mode mode,
- struct clock_event_device *clk)
+static int arch_timer_set_mode_phys(enum clock_event_mode mode,
+ struct clock_event_device *clk)
{
- timer_set_mode(ARCH_TIMER_PHYS_ACCESS, mode, clk);
+ return timer_set_mode(ARCH_TIMER_PHYS_ACCESS, mode, clk);
}

-static void arch_timer_set_mode_virt_mem(enum clock_event_mode mode,
- struct clock_event_device *clk)
+static int arch_timer_set_mode_virt_mem(enum clock_event_mode mode,
+ struct clock_event_device *clk)
{
- timer_set_mode(ARCH_TIMER_MEM_VIRT_ACCESS, mode, clk);
+ return timer_set_mode(ARCH_TIMER_MEM_VIRT_ACCESS, mode, clk);
}

-static void arch_timer_set_mode_phys_mem(enum clock_event_mode mode,
- struct clock_event_device *clk)
+static int arch_timer_set_mode_phys_mem(enum clock_event_mode mode,
+ struct clock_event_device *clk)
{
- timer_set_mode(ARCH_TIMER_MEM_PHYS_ACCESS, mode, clk);
+ return timer_set_mode(ARCH_TIMER_MEM_PHYS_ACCESS, mode, clk);
}

static __always_inline void set_next_event(const int access, unsigned long evt,
@@ -271,11 +275,11 @@ static void __arch_timer_setup(unsigned type,
clk->cpumask = cpumask_of(smp_processor_id());
if (arch_timer_use_virtual) {
clk->irq = arch_timer_ppi[VIRT_PPI];
- clk->set_mode = arch_timer_set_mode_virt;
+ clk->set_dev_mode = arch_timer_set_mode_virt;
clk->set_next_event = arch_timer_set_next_event_virt;
} else {
clk->irq = arch_timer_ppi[PHYS_SECURE_PPI];
- clk->set_mode = arch_timer_set_mode_phys;
+ clk->set_dev_mode = arch_timer_set_mode_phys;
clk->set_next_event = arch_timer_set_next_event_phys;
}
} else {
@@ -284,17 +288,17 @@ static void __arch_timer_setup(unsigned type,
clk->rating = 400;
clk->cpumask = cpu_all_mask;
if (arch_timer_mem_use_virtual) {
- clk->set_mode = arch_timer_set_mode_virt_mem;
+ clk->set_dev_mode = arch_timer_set_mode_virt_mem;
clk->set_next_event =
arch_timer_set_next_event_virt_mem;
} else {
- clk->set_mode = arch_timer_set_mode_phys_mem;
+ clk->set_dev_mode = arch_timer_set_mode_phys_mem;
clk->set_next_event =
arch_timer_set_next_event_phys_mem;
}
}

- clk->set_mode(CLOCK_EVT_MODE_SHUTDOWN, clk);
+ clk->set_dev_mode(CLOCK_EVT_MODE_SHUTDOWN, clk);

clockevents_config_and_register(clk, arch_timer_rate, 0xf, 0x7fffffff);
}
@@ -457,7 +461,7 @@ static void arch_timer_stop(struct clock_event_device *clk)
disable_percpu_irq(arch_timer_ppi[PHYS_NONSECURE_PPI]);
}

- clk->set_mode(CLOCK_EVT_MODE_UNUSED, clk);
+ clk->set_dev_mode(CLOCK_EVT_MODE_UNUSED, clk);
}

static int arch_timer_cpu_notify(struct notifier_block *self,
diff --git a/drivers/clocksource/bcm2835_timer.c b/drivers/clocksource/bcm2835_timer.c
index 26ed331b1aad..04ae14ca81ab 100644
--- a/drivers/clocksource/bcm2835_timer.c
+++ b/drivers/clocksource/bcm2835_timer.c
@@ -54,8 +54,8 @@ static u64 notrace bcm2835_sched_read(void)
return readl_relaxed(system_clock);
}

-static void bcm2835_time_set_mode(enum clock_event_mode mode,
- struct clock_event_device *evt_dev)
+static int bcm2835_time_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *evt_dev)
{
switch (mode) {
case CLOCK_EVT_MODE_ONESHOT:
@@ -64,9 +64,9 @@ static void bcm2835_time_set_mode(enum clock_event_mode mode,
case CLOCK_EVT_MODE_RESUME:
break;
default:
- WARN(1, "%s: unhandled event mode %d\n", __func__, mode);
- break;
+ return -ENOSYS;
}
+ return 0;
}

static int bcm2835_time_set_next_event(unsigned long event,
@@ -129,7 +129,7 @@ static void __init bcm2835_timer_init(struct device_node *node)
timer->evt.name = node->name;
timer->evt.rating = 300;
timer->evt.features = CLOCK_EVT_FEAT_ONESHOT;
- timer->evt.set_mode = bcm2835_time_set_mode;
+ timer->evt.set_dev_mode = bcm2835_time_set_mode;
timer->evt.set_next_event = bcm2835_time_set_next_event;
timer->evt.cpumask = cpumask_of(0);
timer->act.name = node->name;
diff --git a/drivers/clocksource/bcm_kona_timer.c b/drivers/clocksource/bcm_kona_timer.c
index 0595dc6c453e..807915e9e2f8 100644
--- a/drivers/clocksource/bcm_kona_timer.c
+++ b/drivers/clocksource/bcm_kona_timer.c
@@ -128,25 +128,32 @@ static int kona_timer_set_next_event(unsigned long clc,
return 0;
}

-static void kona_timer_set_mode(enum clock_event_mode mode,
- struct clock_event_device *unused)
+static int kona_timer_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *unused)
{
+ int ret = 0;
+
switch (mode) {
case CLOCK_EVT_MODE_ONESHOT:
/* by default mode is one shot don't do any thing */
break;
+ default:
+ ret = -ENOSYS;
+ /* fall through so timer is disabled */
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
- default:
+ case CLOCK_EVT_MODE_RESUME:
kona_timer_disable_and_clear(timers.tmr_regs);
+ break;
}
+ return ret;
}

static struct clock_event_device kona_clockevent_timer = {
.name = "timer 1",
.features = CLOCK_EVT_FEAT_ONESHOT,
.set_next_event = kona_timer_set_next_event,
- .set_mode = kona_timer_set_mode
+ .set_dev_mode = kona_timer_set_mode
};

static void __init kona_timer_clockevents_init(void)
diff --git a/drivers/clocksource/i8253.c b/drivers/clocksource/i8253.c
index 14ee3efcc404..ea28efbfe9cf 100644
--- a/drivers/clocksource/i8253.c
+++ b/drivers/clocksource/i8253.c
@@ -105,9 +105,11 @@ int __init clocksource_i8253_init(void)
*
* This is also called after resume to bring the PIT into operation again.
*/
-static void init_pit_timer(enum clock_event_mode mode,
- struct clock_event_device *evt)
+static int init_pit_timer(enum clock_event_mode mode,
+ struct clock_event_device *evt)
{
+ int ret = 0;
+
raw_spin_lock(&i8253_lock);

switch (mode) {
@@ -136,8 +138,11 @@ static void init_pit_timer(enum clock_event_mode mode,
case CLOCK_EVT_MODE_RESUME:
/* Nothing to do here */
break;
+ default:
+ ret = -ENOSYS;
}
raw_spin_unlock(&i8253_lock);
+ return ret;
}

/*
@@ -162,7 +167,7 @@ static int pit_next_event(unsigned long delta, struct clock_event_device *evt)
struct clock_event_device i8253_clockevent = {
.name = "pit",
.features = CLOCK_EVT_FEAT_PERIODIC,
- .set_mode = init_pit_timer,
+ .set_dev_mode = init_pit_timer,
.set_next_event = pit_next_event,
};

diff --git a/drivers/clocksource/time-armada-370-xp.c b/drivers/clocksource/time-armada-370-xp.c
index 0451e62fac7a..4ea3d4c9d651 100644
--- a/drivers/clocksource/time-armada-370-xp.c
+++ b/drivers/clocksource/time-armada-370-xp.c
@@ -120,12 +120,14 @@ armada_370_xp_clkevt_next_event(unsigned long delta,
return 0;
}

-static void
+static int
armada_370_xp_clkevt_mode(enum clock_event_mode mode,
struct clock_event_device *dev)
{
- if (mode == CLOCK_EVT_MODE_PERIODIC) {
+ int ret = 0;

+ switch (mode) {
+ case CLOCK_EVT_MODE_PERIODIC:
/*
* Setup timer to fire at 1/HZ intervals.
*/
@@ -136,7 +138,14 @@ armada_370_xp_clkevt_mode(enum clock_event_mode mode,
* Enable timer.
*/
local_timer_ctrl_clrset(0, TIMER0_RELOAD_EN | enable_mask);
- } else {
+ break;
+ default:
+ ret = -ENOSYS;
+ /* fall through so timer is disabled, ACK'd */
+ case CLOCK_EVT_MODE_ONESHOT:
+ case CLOCK_EVT_MODE_UNUSED:
+ case CLOCK_EVT_MODE_SHUTDOWN:
+ case CLOCK_EVT_MODE_RESUME:
/*
* Disable timer.
*/
@@ -146,7 +155,9 @@ armada_370_xp_clkevt_mode(enum clock_event_mode mode,
* ACK pending timer interrupt.
*/
writel(TIMER0_CLR_MASK, local_base + LCL_TIMER_EVENTS_STATUS);
+ break;
}
+ return ret;
}

static int armada_370_xp_clkevt_irq;
@@ -184,7 +195,7 @@ static int armada_370_xp_timer_setup(struct clock_event_device *evt)
evt->shift = 32,
evt->rating = 300,
evt->set_next_event = armada_370_xp_clkevt_next_event,
- evt->set_mode = armada_370_xp_clkevt_mode,
+ evt->set_dev_mode = armada_370_xp_clkevt_mode,
evt->irq = armada_370_xp_clkevt_irq;
evt->cpumask = cpumask_of(cpu);

@@ -196,7 +207,7 @@ static int armada_370_xp_timer_setup(struct clock_event_device *evt)

static void armada_370_xp_timer_stop(struct clock_event_device *evt)
{
- evt->set_mode(CLOCK_EVT_MODE_UNUSED, evt);
+ evt->set_dev_mode(CLOCK_EVT_MODE_UNUSED, evt);
disable_percpu_irq(evt->irq);
}

--
1.9.2


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