[PATCH 4/7] clocksource/drivers/timer-mediatek: Use specific prefix for GPT

From: Daniel Lezcano
Date: Thu Jul 26 2018 - 06:16:28 EST

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From: Stanley Chu <stanley.chu@xxxxxxxxxxxx>

Use specific prefix to specify the name of supported
timer hardware: "General Purpose Timer (GPT)".

Signed-off-by: Stanley Chu <stanley.chu@xxxxxxxxxxxx>
Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
---
drivers/clocksource/timer-mediatek.c | 157 ++++++++++++++++++-----------------
1 file changed, 80 insertions(+), 77 deletions(-)

diff --git a/drivers/clocksource/timer-mediatek.c b/drivers/clocksource/timer-mediatek.c
index f9b724f..e3657d2 100644
--- a/drivers/clocksource/timer-mediatek.c
+++ b/drivers/clocksource/timer-mediatek.c
@@ -29,32 +29,35 @@
#include <linux/sched_clock.h>
#include <linux/slab.h>

-#define GPT_IRQ_EN_REG 0x00
-#define GPT_IRQ_ENABLE(val) BIT((val) - 1)
-#define GPT_IRQ_ACK_REG 0x08
-#define GPT_IRQ_ACK(val) BIT((val) - 1)
-
-#define TIMER_CTRL_REG(val) (0x10 * (val))
-#define TIMER_CTRL_OP(val) (((val) & 0x3) << 4)
-#define TIMER_CTRL_OP_ONESHOT (0)
-#define TIMER_CTRL_OP_REPEAT (1)
-#define TIMER_CTRL_OP_FREERUN (3)
-#define TIMER_CTRL_CLEAR (2)
-#define TIMER_CTRL_ENABLE (1)
-#define TIMER_CTRL_DISABLE (0)
-
-#define TIMER_CLK_REG(val) (0x04 + (0x10 * (val)))
-#define TIMER_CLK_SRC(val) (((val) & 0x1) << 4)
-#define TIMER_CLK_SRC_SYS13M (0)
-#define TIMER_CLK_SRC_RTC32K (1)
-#define TIMER_CLK_DIV1 (0x0)
-#define TIMER_CLK_DIV2 (0x1)
-
-#define TIMER_CNT_REG(val) (0x08 + (0x10 * (val)))
-#define TIMER_CMP_REG(val) (0x0C + (0x10 * (val)))
-
-#define GPT_CLK_EVT 1
-#define GPT_CLK_SRC 2
+#define TIMER_CLK_EVT (1)
+#define TIMER_CLK_SRC (2)
+
+#define TIMER_SYNC_TICKS (3)
+
+/* gpt */
+#define GPT_IRQ_EN_REG 0x00
+#define GPT_IRQ_ENABLE(val) BIT((val) - 1)
+#define GPT_IRQ_ACK_REG 0x08
+#define GPT_IRQ_ACK(val) BIT((val) - 1)
+
+#define GPT_CTRL_REG(val) (0x10 * (val))
+#define GPT_CTRL_OP(val) (((val) & 0x3) << 4)
+#define GPT_CTRL_OP_ONESHOT (0)
+#define GPT_CTRL_OP_REPEAT (1)
+#define GPT_CTRL_OP_FREERUN (3)
+#define GPT_CTRL_CLEAR (2)
+#define GPT_CTRL_ENABLE (1)
+#define GPT_CTRL_DISABLE (0)
+
+#define GPT_CLK_REG(val) (0x04 + (0x10 * (val)))
+#define GPT_CLK_SRC(val) (((val) & 0x1) << 4)
+#define GPT_CLK_SRC_SYS13M (0)
+#define GPT_CLK_SRC_RTC32K (1)
+#define GPT_CLK_DIV1 (0x0)
+#define GPT_CLK_DIV2 (0x1)
+
+#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;
@@ -64,7 +67,7 @@ struct mtk_clock_event_device {

static void __iomem *gpt_sched_reg __read_mostly;

-static u64 notrace mtk_read_sched_clock(void)
+static u64 notrace mtk_gpt_read_sched_clock(void)
{
return readl_relaxed(gpt_sched_reg);
}
@@ -75,22 +78,22 @@ static inline struct mtk_clock_event_device *to_mtk_clk(
return container_of(c, struct mtk_clock_event_device, dev);
}

-static void mtk_clkevt_time_stop(struct mtk_clock_event_device *evt, u8 timer)
+static void mtk_gpt_clkevt_time_stop(struct mtk_clock_event_device *evt, u8 timer)
{
u32 val;

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

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

-static void mtk_clkevt_time_start(struct mtk_clock_event_device *evt,
+static void mtk_gpt_clkevt_time_start(struct mtk_clock_event_device *evt,
bool periodic, u8 timer)
{
u32 val;
@@ -98,75 +101,75 @@ static void mtk_clkevt_time_start(struct mtk_clock_event_device *evt,
/* Acknowledge interrupt */
writel(GPT_IRQ_ACK(timer), evt->gpt_base + GPT_IRQ_ACK_REG);

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

/* Clear 2 bit timer operation mode field */
- val &= ~TIMER_CTRL_OP(0x3);
+ val &= ~GPT_CTRL_OP(0x3);

if (periodic)
- val |= TIMER_CTRL_OP(TIMER_CTRL_OP_REPEAT);
+ val |= GPT_CTRL_OP(GPT_CTRL_OP_REPEAT);
else
- val |= TIMER_CTRL_OP(TIMER_CTRL_OP_ONESHOT);
+ val |= GPT_CTRL_OP(GPT_CTRL_OP_ONESHOT);

- writel(val | TIMER_CTRL_ENABLE | TIMER_CTRL_CLEAR,
- evt->gpt_base + TIMER_CTRL_REG(timer));
+ writel(val | GPT_CTRL_ENABLE | GPT_CTRL_CLEAR,
+ evt->gpt_base + GPT_CTRL_REG(timer));
}

-static int mtk_clkevt_shutdown(struct clock_event_device *clk)
+static int mtk_gpt_clkevt_shutdown(struct clock_event_device *clk)
{
- mtk_clkevt_time_stop(to_mtk_clk(clk), GPT_CLK_EVT);
+ mtk_gpt_clkevt_time_stop(to_mtk_clk(clk), TIMER_CLK_EVT);
return 0;
}

-static int mtk_clkevt_set_periodic(struct clock_event_device *clk)
+static int mtk_gpt_clkevt_set_periodic(struct clock_event_device *clk)
{
struct mtk_clock_event_device *evt = to_mtk_clk(clk);

- mtk_clkevt_time_stop(evt, GPT_CLK_EVT);
- mtk_clkevt_time_setup(evt, evt->ticks_per_jiffy, GPT_CLK_EVT);
- mtk_clkevt_time_start(evt, true, GPT_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_clkevt_next_event(unsigned long event,
+static int mtk_gpt_clkevt_next_event(unsigned long event,
struct clock_event_device *clk)
{
struct mtk_clock_event_device *evt = to_mtk_clk(clk);

- mtk_clkevt_time_stop(evt, GPT_CLK_EVT);
- mtk_clkevt_time_setup(evt, event, GPT_CLK_EVT);
- mtk_clkevt_time_start(evt, false, GPT_CLK_EVT);
+ 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);

return 0;
}

-static irqreturn_t mtk_timer_interrupt(int irq, void *dev_id)
+static irqreturn_t mtk_gpt_interrupt(int irq, void *dev_id)
{
struct mtk_clock_event_device *evt = dev_id;

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

return IRQ_HANDLED;
}

static void
-__init mtk_timer_setup(struct mtk_clock_event_device *evt, u8 timer, u8 option)
+__init mtk_gpt_setup(struct mtk_clock_event_device *evt, u8 timer, u8 option)
{
- writel(TIMER_CTRL_CLEAR | TIMER_CTRL_DISABLE,
- evt->gpt_base + TIMER_CTRL_REG(timer));
+ writel(GPT_CTRL_CLEAR | GPT_CTRL_DISABLE,
+ evt->gpt_base + GPT_CTRL_REG(timer));

- writel(TIMER_CLK_SRC(TIMER_CLK_SRC_SYS13M) | TIMER_CLK_DIV1,
- evt->gpt_base + TIMER_CLK_REG(timer));
+ writel(GPT_CLK_SRC(GPT_CLK_SRC_SYS13M) | GPT_CLK_DIV1,
+ evt->gpt_base + GPT_CLK_REG(timer));

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

- writel(TIMER_CTRL_OP(option) | TIMER_CTRL_ENABLE,
- evt->gpt_base + TIMER_CTRL_REG(timer));
+ writel(GPT_CTRL_OP(option) | GPT_CTRL_ENABLE,
+ evt->gpt_base + GPT_CTRL_REG(timer));
}

-static void mtk_timer_enable_irq(struct mtk_clock_event_device *evt, u8 timer)
+static void mtk_gpt_enable_irq(struct mtk_clock_event_device *evt, u8 timer)
{
u32 val;

@@ -181,7 +184,7 @@ static void mtk_timer_enable_irq(struct mtk_clock_event_device *evt, u8 timer)
evt->gpt_base + GPT_IRQ_EN_REG);
}

-static int __init mtk_timer_init(struct device_node *node)
+static int __init mtk_gpt_init(struct device_node *node)
{
struct mtk_clock_event_device *evt;
struct resource res;
@@ -195,14 +198,14 @@ static int __init mtk_timer_init(struct device_node *node)
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_clkevt_shutdown;
- evt->dev.set_state_periodic = mtk_clkevt_set_periodic;
- evt->dev.set_state_oneshot = mtk_clkevt_shutdown;
- evt->dev.tick_resume = mtk_clkevt_shutdown;
- evt->dev.set_next_event = mtk_clkevt_next_event;
+ 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");
+ 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;
@@ -226,7 +229,7 @@ static int __init mtk_timer_init(struct device_node *node)
}
rate = clk_get_rate(clk);

- if (request_irq(evt->dev.irq, mtk_timer_interrupt,
+ 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;
@@ -235,18 +238,18 @@ static int __init mtk_timer_init(struct device_node *node)
evt->ticks_per_jiffy = DIV_ROUND_UP(rate, HZ);

/* Configure clock source */
- mtk_timer_setup(evt, GPT_CLK_SRC, TIMER_CTRL_OP_FREERUN);
- clocksource_mmio_init(evt->gpt_base + TIMER_CNT_REG(GPT_CLK_SRC),
+ 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 + TIMER_CNT_REG(GPT_CLK_SRC);
- sched_clock_register(mtk_read_sched_clock, 32, rate);
+ gpt_sched_reg = evt->gpt_base + GPT_CNT_REG(TIMER_CLK_SRC);
+ sched_clock_register(mtk_gpt_read_sched_clock, 32, rate);

/* Configure clock event */
- mtk_timer_setup(evt, GPT_CLK_EVT, TIMER_CTRL_OP_REPEAT);
- clockevents_config_and_register(&evt->dev, rate, 0x3,
+ mtk_gpt_setup(evt, TIMER_CLK_EVT, GPT_CTRL_OP_REPEAT);
+ clockevents_config_and_register(&evt->dev, rate, TIMER_SYNC_TICKS,
0xffffffff);

- mtk_timer_enable_irq(evt, GPT_CLK_EVT);
+ mtk_gpt_enable_irq(evt, TIMER_CLK_EVT);

return 0;

@@ -265,4 +268,4 @@ static int __init mtk_timer_init(struct device_node *node)

return -EINVAL;
}
-TIMER_OF_DECLARE(mtk_mt6577, "mediatek,mt6577-timer", mtk_timer_init);
+TIMER_OF_DECLARE(mtk_mt6577, "mediatek,mt6577-timer", mtk_gpt_init);
--
2.7.4

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