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clocksource/drivers/sun4i: Switch to the timer-of common init 

Previously a framework to factor out the drivers init function has been
merged.

Use this common framework in this driver, we get:

Before:

text    data     bss     dec   hex filename
1787     384      12    2183   887 drivers/clocksource/sun4i_timer.o

After:

text    data     bss     dec   hex filename
1407     512       0    1919   77f drivers/clocksource/sun4i_timer.o

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Tested-by: Chen-Yu Tsai <wens@csie.org>
This commit is contained in:
Daniel Lezcano 2017-06-06 23:07:51 +02:00
parent 22ece4e3df
commit 239751edad
2 changed files with 78 additions and 94 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/clocksource/Kconfig
View File

@ -108,6 +108,7 @@ config SUN4I_TIMER
depends on GENERIC_CLOCKEVENTS
depends on HAS_IOMEM
select CLKSRC_MMIO
select TIMER_OF
help
Enables support for the Sun4i timer.

175
drivers/clocksource/sun4i_timer.c
View File

@ -24,6 +24,8 @@
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include "timer-of.h"
#define TIMER_IRQ_EN_REG 0x00
#define TIMER_IRQ_EN(val) BIT(val)
#define TIMER_IRQ_ST_REG 0x04
@ -39,38 +41,37 @@
#define TIMER_SYNC_TICKS 3
static void __iomem *timer_base;
static u32 ticks_per_jiffy;
/*
* When we disable a timer, we need to wait at least for 2 cycles of
* the timer source clock. We will use for that the clocksource timer
* that is already setup and runs at the same frequency than the other
* timers, and we never will be disabled.
*/
static void sun4i_clkevt_sync(void)
static void sun4i_clkevt_sync(void __iomem *base)
{
u32 old = readl(timer_base + TIMER_CNTVAL_REG(1));
u32 old = readl(base + TIMER_CNTVAL_REG(1));
while ((old - readl(timer_base + TIMER_CNTVAL_REG(1))) < TIMER_SYNC_TICKS)
while ((old - readl(base + TIMER_CNTVAL_REG(1))) < TIMER_SYNC_TICKS)
cpu_relax();
}
static void sun4i_clkevt_time_stop(u8 timer)
static void sun4i_clkevt_time_stop(void __iomem *base, u8 timer)
{
u32 val = readl(timer_base + TIMER_CTL_REG(timer));
writel(val & ~TIMER_CTL_ENABLE, timer_base + TIMER_CTL_REG(timer));
sun4i_clkevt_sync();
u32 val = readl(base + TIMER_CTL_REG(timer));
writel(val & ~TIMER_CTL_ENABLE, base + TIMER_CTL_REG(timer));
sun4i_clkevt_sync(base);
}
static void sun4i_clkevt_time_setup(u8 timer, unsigned long delay)
static void sun4i_clkevt_time_setup(void __iomem *base, u8 timer,
unsigned long delay)
{
writel(delay, timer_base + TIMER_INTVAL_REG(timer));
writel(delay, base + TIMER_INTVAL_REG(timer));
}
static void sun4i_clkevt_time_start(u8 timer, bool periodic)
static void sun4i_clkevt_time_start(void __iomem *base, u8 timer,
bool periodic)
{
u32 val = readl(timer_base + TIMER_CTL_REG(timer));
u32 val = readl(base + TIMER_CTL_REG(timer));
if (periodic)
val &= ~TIMER_CTL_ONESHOT;
@ -78,41 +79,71 @@ static void sun4i_clkevt_time_start(u8 timer, bool periodic)
val |= TIMER_CTL_ONESHOT;
writel(val | TIMER_CTL_ENABLE | TIMER_CTL_RELOAD,
timer_base + TIMER_CTL_REG(timer));
base + TIMER_CTL_REG(timer));
}
static int sun4i_clkevt_shutdown(struct clock_event_device *evt)
{
sun4i_clkevt_time_stop(0);
struct timer_of *to = to_timer_of(evt);
sun4i_clkevt_time_stop(timer_of_base(to), 0);
return 0;
}
static int sun4i_clkevt_set_oneshot(struct clock_event_device *evt)
{
sun4i_clkevt_time_stop(0);
sun4i_clkevt_time_start(0, false);
struct timer_of *to = to_timer_of(evt);
sun4i_clkevt_time_stop(timer_of_base(to), 0);
sun4i_clkevt_time_start(timer_of_base(to), 0, false);
return 0;
}
static int sun4i_clkevt_set_periodic(struct clock_event_device *evt)
{
sun4i_clkevt_time_stop(0);
sun4i_clkevt_time_setup(0, ticks_per_jiffy);
sun4i_clkevt_time_start(0, true);
struct timer_of *to = to_timer_of(evt);
sun4i_clkevt_time_stop(timer_of_base(to), 0);
sun4i_clkevt_time_setup(timer_of_base(to), 0, timer_of_period(to));
sun4i_clkevt_time_start(timer_of_base(to), 0, true);
return 0;
}
static int sun4i_clkevt_next_event(unsigned long evt,
struct clock_event_device *unused)
struct clock_event_device *clkevt)
{
sun4i_clkevt_time_stop(0);
sun4i_clkevt_time_setup(0, evt - TIMER_SYNC_TICKS);
sun4i_clkevt_time_start(0, false);
struct timer_of *to = to_timer_of(clkevt);
sun4i_clkevt_time_stop(timer_of_base(to), 0);
sun4i_clkevt_time_setup(timer_of_base(to), 0, evt - TIMER_SYNC_TICKS);
sun4i_clkevt_time_start(timer_of_base(to), 0, false);
return 0;
}
static struct clock_event_device sun4i_clockevent = {
static void sun4i_timer_clear_interrupt(void __iomem *base)
{
writel(TIMER_IRQ_EN(0), base + TIMER_IRQ_ST_REG);
}
static irqreturn_t sun4i_timer_interrupt(int irq, void *dev_id)
{
struct clock_event_device *evt = (struct clock_event_device *)dev_id;
struct timer_of *to = to_timer_of(evt);
sun4i_timer_clear_interrupt(timer_of_base(to));
evt->event_handler(evt);
return IRQ_HANDLED;
}
static struct timer_of to = {
.flags = TIMER_OF_IRQ | TIMER_OF_CLOCK | TIMER_OF_BASE,
.clkevt = {
.name = "sun4i_tick",
.rating = 350,
.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
@ -121,72 +152,33 @@ static struct clock_event_device sun4i_clockevent = {
.set_state_oneshot = sun4i_clkevt_set_oneshot,
.tick_resume = sun4i_clkevt_shutdown,
.set_next_event = sun4i_clkevt_next_event,
};
.cpumask = cpu_possible_mask,
},
static void sun4i_timer_clear_interrupt(void)
{
writel(TIMER_IRQ_EN(0), timer_base + TIMER_IRQ_ST_REG);
}
static irqreturn_t sun4i_timer_interrupt(int irq, void *dev_id)
{
struct clock_event_device *evt = (struct clock_event_device *)dev_id;
sun4i_timer_clear_interrupt();
evt->event_handler(evt);
return IRQ_HANDLED;
}
static struct irqaction sun4i_timer_irq = {
.name = "sun4i_timer0",
.flags = IRQF_TIMER | IRQF_IRQPOLL,
.of_irq = {
.handler = sun4i_timer_interrupt,
.dev_id = &sun4i_clockevent,
.flags = IRQF_TIMER | IRQF_IRQPOLL,
},
};
static u64 notrace sun4i_timer_sched_read(void)
{
return ~readl(timer_base + TIMER_CNTVAL_REG(1));
return ~readl(timer_of_base(&to) + TIMER_CNTVAL_REG(1));
}
static int __init sun4i_timer_init(struct device_node *node)
{
unsigned long rate = 0;
struct clk *clk;
int ret, irq;
int ret;
u32 val;
timer_base = of_iomap(node, 0);
if (!timer_base) {
pr_crit("Can't map registers\n");
return -ENXIO;
}
irq = irq_of_parse_and_map(node, 0);
if (irq <= 0) {
pr_crit("Can't parse IRQ\n");
return -EINVAL;
}
clk = of_clk_get(node, 0);
if (IS_ERR(clk)) {
pr_crit("Can't get timer clock\n");
return PTR_ERR(clk);
}
ret = clk_prepare_enable(clk);
if (ret) {
pr_err("Failed to prepare clock\n");
ret = timer_of_init(node, &to);
if (ret)
return ret;
}
rate = clk_get_rate(clk);
writel(~0, timer_base + TIMER_INTVAL_REG(1));
writel(~0, timer_of_base(&to) + TIMER_INTVAL_REG(1));
writel(TIMER_CTL_ENABLE | TIMER_CTL_RELOAD |
TIMER_CTL_CLK_SRC(TIMER_CTL_CLK_SRC_OSC24M),
timer_base + TIMER_CTL_REG(1));
timer_of_base(&to) + TIMER_CTL_REG(1));
/*
* sched_clock_register does not have priorities, and on sun6i and
@ -195,41 +187,32 @@ static int __init sun4i_timer_init(struct device_node *node)
if (of_machine_is_compatible("allwinner,sun4i-a10") ||
of_machine_is_compatible("allwinner,sun5i-a13") ||
of_machine_is_compatible("allwinner,sun5i-a10s"))
sched_clock_register(sun4i_timer_sched_read, 32, rate);
sched_clock_register(sun4i_timer_sched_read, 32,
timer_of_rate(&to));
ret = clocksource_mmio_init(timer_base + TIMER_CNTVAL_REG(1), node->name,
rate, 350, 32, clocksource_mmio_readl_down);
ret = clocksource_mmio_init(timer_of_base(&to) + TIMER_CNTVAL_REG(1),
node->name, timer_of_rate(&to), 350, 32,
clocksource_mmio_readl_down);
if (ret) {
pr_err("Failed to register clocksource\n");
return ret;
}
ticks_per_jiffy = DIV_ROUND_UP(rate, HZ);
writel(TIMER_CTL_CLK_SRC(TIMER_CTL_CLK_SRC_OSC24M),
timer_base + TIMER_CTL_REG(0));
timer_of_base(&to) + TIMER_CTL_REG(0));
/* Make sure timer is stopped before playing with interrupts */
sun4i_clkevt_time_stop(0);
sun4i_clkevt_time_stop(timer_of_base(&to), 0);
/* clear timer0 interrupt */
sun4i_timer_clear_interrupt();
sun4i_timer_clear_interrupt(timer_of_base(&to));
sun4i_clockevent.cpumask = cpu_possible_mask;
sun4i_clockevent.irq = irq;
clockevents_config_and_register(&sun4i_clockevent, rate,
clockevents_config_and_register(&to.clkevt, timer_of_rate(&to),
TIMER_SYNC_TICKS, 0xffffffff);
ret = setup_irq(irq, &sun4i_timer_irq);
if (ret) {
pr_err("failed to setup irq %d\n", irq);
return ret;
}
/* Enable timer0 interrupt */
val = readl(timer_base + TIMER_IRQ_EN_REG);
writel(val | TIMER_IRQ_EN(0), timer_base + TIMER_IRQ_EN_REG);
val = readl(timer_of_base(&to) + TIMER_IRQ_EN_REG);
writel(val | TIMER_IRQ_EN(0), timer_of_base(&to) + TIMER_IRQ_EN_REG);
return ret;
}