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Subject[PATCH v5 4/5] clocksource/drivers/timer-mediatek: Convert the driver to timer-of
Date
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>
---
drivers/clocksource/timer-mediatek.c | 205 +++++++++++++---------------------
1 file changed, 80 insertions(+), 125 deletions(-)

diff --git a/drivers/clocksource/timer-mediatek.c b/drivers/clocksource/timer-mediatek.c
index e3657d2..e57c4d7 100644
--- a/drivers/clocksource/timer-mediatek.c
+++ b/drivers/clocksource/timer-mediatek.c
@@ -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)
@@ -59,12 +56,6 @@
#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)
@@ -72,36 +63,30 @@ 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);
@@ -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);
--
1.7.9.5
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