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clocksource/drivers/timer-mediatek: Convert the driver to timer-of
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Convert the driver to use the timer_of helpers.
This allows to remove custom proprietary structure,
factors out and simplifies the code.

Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
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@dlezcano
Stanley Chu authored and dlezcano committed Jul 26, 2018
1 parent 56d52d3 commit a0858f9
Showing 1 changed file with 80 additions and 125 deletions.
205 changes: 80 additions & 125 deletions drivers/clocksource/timer-mediatek.c
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Original file line number Diff line number Diff line change
Expand Up @@ -18,16 +18,13 @@

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/clk.h>
#include <linux/clockchips.h>
#include <linux/clocksource.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqreturn.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/sched_clock.h>
#include <linux/slab.h>
#include "timer-of.h"

#define TIMER_CLK_EVT (1)
#define TIMER_CLK_SRC (2)
Expand Down Expand Up @@ -59,49 +56,37 @@
#define GPT_CNT_REG(val) (0x08 + (0x10 * (val)))
#define GPT_CMP_REG(val) (0x0C + (0x10 * (val)))

struct mtk_clock_event_device {
void __iomem *gpt_base;
u32 ticks_per_jiffy;
struct clock_event_device dev;
};

static void __iomem *gpt_sched_reg __read_mostly;

static u64 notrace mtk_gpt_read_sched_clock(void)
{
return readl_relaxed(gpt_sched_reg);
}

static inline struct mtk_clock_event_device *to_mtk_clk(
struct clock_event_device *c)
{
return container_of(c, struct mtk_clock_event_device, dev);
}

static void mtk_gpt_clkevt_time_stop(struct mtk_clock_event_device *evt, u8 timer)
static void mtk_gpt_clkevt_time_stop(struct timer_of *to, u8 timer)
{
u32 val;

val = readl(evt->gpt_base + GPT_CTRL_REG(timer));
writel(val & ~GPT_CTRL_ENABLE, evt->gpt_base +
GPT_CTRL_REG(timer));
val = readl(timer_of_base(to) + GPT_CTRL_REG(timer));
writel(val & ~GPT_CTRL_ENABLE, timer_of_base(to) +
GPT_CTRL_REG(timer));
}

static void mtk_gpt_clkevt_time_setup(struct mtk_clock_event_device *evt,
unsigned long delay, u8 timer)
static void mtk_gpt_clkevt_time_setup(struct timer_of *to,
unsigned long delay, u8 timer)
{
writel(delay, evt->gpt_base + GPT_CMP_REG(timer));
writel(delay, timer_of_base(to) + GPT_CMP_REG(timer));
}

static void mtk_gpt_clkevt_time_start(struct mtk_clock_event_device *evt,
bool periodic, u8 timer)
static void mtk_gpt_clkevt_time_start(struct timer_of *to,
bool periodic, u8 timer)
{
u32 val;

/* Acknowledge interrupt */
writel(GPT_IRQ_ACK(timer), evt->gpt_base + GPT_IRQ_ACK_REG);
writel(GPT_IRQ_ACK(timer), timer_of_base(to) + GPT_IRQ_ACK_REG);

val = readl(evt->gpt_base + GPT_CTRL_REG(timer));
val = readl(timer_of_base(to) + GPT_CTRL_REG(timer));

/* Clear 2 bit timer operation mode field */
val &= ~GPT_CTRL_OP(0x3);
Expand All @@ -112,160 +97,130 @@ static void mtk_gpt_clkevt_time_start(struct mtk_clock_event_device *evt,
val |= GPT_CTRL_OP(GPT_CTRL_OP_ONESHOT);

writel(val | GPT_CTRL_ENABLE | GPT_CTRL_CLEAR,
evt->gpt_base + GPT_CTRL_REG(timer));
timer_of_base(to) + GPT_CTRL_REG(timer));
}

static int mtk_gpt_clkevt_shutdown(struct clock_event_device *clk)
{
mtk_gpt_clkevt_time_stop(to_mtk_clk(clk), TIMER_CLK_EVT);
mtk_gpt_clkevt_time_stop(to_timer_of(clk), TIMER_CLK_EVT);

return 0;
}

static int mtk_gpt_clkevt_set_periodic(struct clock_event_device *clk)
{
struct mtk_clock_event_device *evt = to_mtk_clk(clk);
struct timer_of *to = to_timer_of(clk);

mtk_gpt_clkevt_time_stop(to, TIMER_CLK_EVT);
mtk_gpt_clkevt_time_setup(to, to->of_clk.period, TIMER_CLK_EVT);
mtk_gpt_clkevt_time_start(to, true, TIMER_CLK_EVT);

mtk_gpt_clkevt_time_stop(evt, TIMER_CLK_EVT);
mtk_gpt_clkevt_time_setup(evt, evt->ticks_per_jiffy, TIMER_CLK_EVT);
mtk_gpt_clkevt_time_start(evt, true, TIMER_CLK_EVT);
return 0;
}

static int mtk_gpt_clkevt_next_event(unsigned long event,
struct clock_event_device *clk)
struct clock_event_device *clk)
{
struct mtk_clock_event_device *evt = to_mtk_clk(clk);
struct timer_of *to = to_timer_of(clk);

mtk_gpt_clkevt_time_stop(evt, TIMER_CLK_EVT);
mtk_gpt_clkevt_time_setup(evt, event, TIMER_CLK_EVT);
mtk_gpt_clkevt_time_start(evt, false, TIMER_CLK_EVT);
mtk_gpt_clkevt_time_stop(to, TIMER_CLK_EVT);
mtk_gpt_clkevt_time_setup(to, event, TIMER_CLK_EVT);
mtk_gpt_clkevt_time_start(to, false, TIMER_CLK_EVT);

return 0;
}

static irqreturn_t mtk_gpt_interrupt(int irq, void *dev_id)
{
struct mtk_clock_event_device *evt = dev_id;
struct clock_event_device *clkevt = (struct clock_event_device *)dev_id;
struct timer_of *to = to_timer_of(clkevt);

/* Acknowledge timer0 irq */
writel(GPT_IRQ_ACK(TIMER_CLK_EVT), evt->gpt_base + GPT_IRQ_ACK_REG);
evt->dev.event_handler(&evt->dev);
writel(GPT_IRQ_ACK(TIMER_CLK_EVT), timer_of_base(to) + GPT_IRQ_ACK_REG);
clkevt->event_handler(clkevt);

return IRQ_HANDLED;
}

static void
__init mtk_gpt_setup(struct mtk_clock_event_device *evt, u8 timer, u8 option)
__init mtk_gpt_setup(struct timer_of *to, u8 timer, u8 option)
{
writel(GPT_CTRL_CLEAR | GPT_CTRL_DISABLE,
evt->gpt_base + GPT_CTRL_REG(timer));
timer_of_base(to) + GPT_CTRL_REG(timer));

writel(GPT_CLK_SRC(GPT_CLK_SRC_SYS13M) | GPT_CLK_DIV1,
evt->gpt_base + GPT_CLK_REG(timer));
timer_of_base(to) + GPT_CLK_REG(timer));

writel(0x0, evt->gpt_base + GPT_CMP_REG(timer));
writel(0x0, timer_of_base(to) + GPT_CMP_REG(timer));

writel(GPT_CTRL_OP(option) | GPT_CTRL_ENABLE,
evt->gpt_base + GPT_CTRL_REG(timer));
timer_of_base(to) + GPT_CTRL_REG(timer));
}

static void mtk_gpt_enable_irq(struct mtk_clock_event_device *evt, u8 timer)
static void mtk_gpt_enable_irq(struct timer_of *to, u8 timer)
{
u32 val;

/* Disable all interrupts */
writel(0x0, evt->gpt_base + GPT_IRQ_EN_REG);
writel(0x0, timer_of_base(to) + GPT_IRQ_EN_REG);

/* Acknowledge all spurious pending interrupts */
writel(0x3f, evt->gpt_base + GPT_IRQ_ACK_REG);
writel(0x3f, timer_of_base(to) + GPT_IRQ_ACK_REG);

val = readl(evt->gpt_base + GPT_IRQ_EN_REG);
val = readl(timer_of_base(to) + GPT_IRQ_EN_REG);
writel(val | GPT_IRQ_ENABLE(timer),
evt->gpt_base + GPT_IRQ_EN_REG);
timer_of_base(to) + GPT_IRQ_EN_REG);
}

static struct timer_of to = {
.flags = TIMER_OF_IRQ | TIMER_OF_BASE | TIMER_OF_CLOCK,

.clkevt = {
.name = "mtk-clkevt",
.rating = 300,
.cpumask = cpu_possible_mask,
},

.of_irq = {
.flags = IRQF_TIMER | IRQF_IRQPOLL,
},
};

static int __init mtk_gpt_init(struct device_node *node)
{
struct mtk_clock_event_device *evt;
struct resource res;
unsigned long rate = 0;
struct clk *clk;

evt = kzalloc(sizeof(*evt), GFP_KERNEL);
if (!evt)
return -ENOMEM;

evt->dev.name = "mtk_tick";
evt->dev.rating = 300;
evt->dev.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
evt->dev.set_state_shutdown = mtk_gpt_clkevt_shutdown;
evt->dev.set_state_periodic = mtk_gpt_clkevt_set_periodic;
evt->dev.set_state_oneshot = mtk_gpt_clkevt_shutdown;
evt->dev.tick_resume = mtk_gpt_clkevt_shutdown;
evt->dev.set_next_event = mtk_gpt_clkevt_next_event;
evt->dev.cpumask = cpu_possible_mask;

evt->gpt_base = of_io_request_and_map(node, 0, "mtk-timer-gpt");
if (IS_ERR(evt->gpt_base)) {
pr_err("Can't get resource\n");
goto err_kzalloc;
}

evt->dev.irq = irq_of_parse_and_map(node, 0);
if (evt->dev.irq <= 0) {
pr_err("Can't parse IRQ\n");
goto err_mem;
}

clk = of_clk_get(node, 0);
if (IS_ERR(clk)) {
pr_err("Can't get timer clock\n");
goto err_irq;
}

if (clk_prepare_enable(clk)) {
pr_err("Can't prepare clock\n");
goto err_clk_put;
}
rate = clk_get_rate(clk);

if (request_irq(evt->dev.irq, mtk_gpt_interrupt,
IRQF_TIMER | IRQF_IRQPOLL, "mtk_timer", evt)) {
pr_err("failed to setup irq %d\n", evt->dev.irq);
goto err_clk_disable;
}

evt->ticks_per_jiffy = DIV_ROUND_UP(rate, HZ);
int ret;

to.clkevt.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
to.clkevt.set_state_shutdown = mtk_gpt_clkevt_shutdown;
to.clkevt.set_state_periodic = mtk_gpt_clkevt_set_periodic;
to.clkevt.set_state_oneshot = mtk_gpt_clkevt_shutdown;
to.clkevt.tick_resume = mtk_gpt_clkevt_shutdown;
to.clkevt.set_next_event = mtk_gpt_clkevt_next_event;
to.of_irq.handler = mtk_gpt_interrupt;

ret = timer_of_init(node, &to);
if (ret)
goto err;

/* Configure clock source */
mtk_gpt_setup(evt, TIMER_CLK_SRC, GPT_CTRL_OP_FREERUN);
clocksource_mmio_init(evt->gpt_base + GPT_CNT_REG(TIMER_CLK_SRC),
node->name, rate, 300, 32, clocksource_mmio_readl_up);
gpt_sched_reg = evt->gpt_base + GPT_CNT_REG(TIMER_CLK_SRC);
sched_clock_register(mtk_gpt_read_sched_clock, 32, rate);
mtk_gpt_setup(&to, TIMER_CLK_SRC, GPT_CTRL_OP_FREERUN);
clocksource_mmio_init(timer_of_base(&to) + GPT_CNT_REG(TIMER_CLK_SRC),
node->name, timer_of_rate(&to), 300, 32,
clocksource_mmio_readl_up);
gpt_sched_reg = timer_of_base(&to) + GPT_CNT_REG(TIMER_CLK_SRC);
sched_clock_register(mtk_gpt_read_sched_clock, 32, timer_of_rate(&to));

/* Configure clock event */
mtk_gpt_setup(evt, TIMER_CLK_EVT, GPT_CTRL_OP_REPEAT);
clockevents_config_and_register(&evt->dev, rate, TIMER_SYNC_TICKS,
0xffffffff);
mtk_gpt_setup(&to, TIMER_CLK_EVT, GPT_CTRL_OP_REPEAT);
clockevents_config_and_register(&to.clkevt, timer_of_rate(&to),
TIMER_SYNC_TICKS, 0xffffffff);

mtk_gpt_enable_irq(evt, TIMER_CLK_EVT);
mtk_gpt_enable_irq(&to, TIMER_CLK_EVT);

return 0;

err_clk_disable:
clk_disable_unprepare(clk);
err_clk_put:
clk_put(clk);
err_irq:
irq_dispose_mapping(evt->dev.irq);
err_mem:
iounmap(evt->gpt_base);
of_address_to_resource(node, 0, &res);
release_mem_region(res.start, resource_size(&res));
err_kzalloc:
kfree(evt);

return -EINVAL;
err:
timer_of_cleanup(&to);
return ret;
}
TIMER_OF_DECLARE(mtk_mt6577, "mediatek,mt6577-timer", mtk_gpt_init);

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