Re: [PATCH 4/5] clocksource: rockchip: add support for rk3399 SoC

Huang, Tao
2016-05-31T13:46:23Z

Hi Daniel:
On 2016年05月31日 07:28, Daniel Lezcano wrote:
> On 05/25/2016 11:50 AM, Caesar Wang wrote:
>> From: Huang Tao <huangtao@rock-chips.com>
>>
>> The CONTROL register offset is different from old SoCs.
>> For Linux driver, there are not functional changes at all.
>> Let's call it v2.
>>
>> Signed-off-by: Huang Tao <huangtao@rock-chips.com>
>> Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
>> Cc: Thomas Gleixner <tglx@linutronix.de>
>> Cc: Heiko Stuebner <heiko@sntech.de>
>> Tested-by: Jianqun Xu <jay.xu@rock-chips.com>
>> Signed-off-by: Caesar Wang <wxt@rock-chips.com>
>> ---
>
> That's hackish.
Yes:( I blamed our IC guy.
>
> Please consider something like:
>
> diff --git a/drivers/clocksource/rockchip_timer.c
> b/drivers/clocksource/rockchip_timer.c
> index b991b28..b6ba6f9 100644
> --- a/drivers/clocksource/rockchip_timer.c
> +++ b/drivers/clocksource/rockchip_timer.c
> @@ -19,7 +19,8 @@
>
> #define TIMER_LOAD_COUNT0 0x00
> #define TIMER_LOAD_COUNT1 0x04
> -#define TIMER_CONTROL_REG 0x10
> +#define TIMER_CONTROL_REG3288 0x10
> +#define TIMER_CONTROL_REG3399 0x1C
> #define TIMER_INT_STATUS 0x18
>
> #define TIMER_DISABLE 0x0
> @@ -31,6 +32,7 @@
> struct bc_timer {
> struct clock_event_device ce;
> void __iomem *base;
> + void __iomem *ctrl;
> u32 freq;
> };
>
> @@ -46,15 +48,20 @@ static inline void __iomem *rk_base(struct
> clock_event_device *ce)
> return rk_timer(ce)->base;
> }
>
> +static inline void __iomem *rk_ctrl(struct clock_event_device *ce)
> +{
> + return rk_timer(ce)->ctrl;
> +}
> +
> static inline void rk_timer_disable(struct clock_event_device *ce)
> {
> - writel_relaxed(TIMER_DISABLE, rk_base(ce) + TIMER_CONTROL_REG);
> + writel_relaxed(TIMER_DISABLE, rk_ctrl(ce));
> }
>
> static inline void rk_timer_enable(struct clock_event_device *ce, u32
> flags)
> {
> writel_relaxed(TIMER_ENABLE | TIMER_INT_UNMASK | flags,
> - rk_base(ce) + TIMER_CONTROL_REG);
> + rk_ctrl(ce));
> }
>
> static void rk_timer_update_counter(unsigned long cycles,
> @@ -179,4 +186,18 @@ out_unmap:
> iounmap(bc_timer.base);
> }
>
> -CLOCKSOURCE_OF_DECLARE(rk_timer, "rockchip,rk3288-timer", rk_timer_init);
> +static void __init rk3288_timer_init(struct device_node *np)
> +{
> + bc_timer.ctrl = TIMER_CONTROL_REG3288;
> + rk_timer_init(np);
> +}
> +
> +static void __init rk3399_timer_init(struct device_node *np)
> +{
> + bc_timer.ctrl = TIMER_CONTROL_REG3399;
> + rk_timer_init(np);
> +}
> +
> +
> +CLOCKSOURCE_OF_DECLARE(rk_timer, "rockchip,rk3288-timer",
> rk3288_timer_init);
> +CLOCKSOURCE_OF_DECLARE(rk_timer, "rockchip,rk3399-timer",
> rk3399_timer_init);
>
>

I think you mean this patch otherwise compile will fail:
@@ -19,7 +19,8 @@

#define TIMER_LOAD_COUNT0 0x00
#define TIMER_LOAD_COUNT1 0x04
-#define TIMER_CONTROL_REG 0x10
+#define TIMER_CONTROL_REG3288 0x10
+#define TIMER_CONTROL_REG3399 0x1C
#define TIMER_INT_STATUS 0x18

#define TIMER_DISABLE 0x0
@@ -31,6 +32,7 @@
struct bc_timer {
struct clock_event_device ce;
void __iomem *base;
+ u32 ctrl;
u32 freq;
};

@@ -46,15 +48,20 @@ static inline void __iomem *rk_base(struct
clock_event_device *ce)
return rk_timer(ce)->base;
}

+static inline void __iomem *rk_ctrl(struct clock_event_device *ce)
+{
+ return rk_timer(ce)->base + rk_timer(ce)->ctrl;
+}
+
static inline void rk_timer_disable(struct clock_event_device *ce)
{
- writel_relaxed(TIMER_DISABLE, rk_base(ce) + TIMER_CONTROL_REG);
+ writel_relaxed(TIMER_DISABLE, rk_ctrl(ce));
}

static inline void rk_timer_enable(struct clock_event_device *ce, u32
flags)
{
writel_relaxed(TIMER_ENABLE | TIMER_INT_UNMASK | flags,
- rk_base(ce) + TIMER_CONTROL_REG);
+ rk_ctrl(ce));
}

static void rk_timer_update_counter(unsigned long cycles,
@@ -179,4 +186,19 @@ out_unmap:
iounmap(bc_timer.base);
}

-CLOCKSOURCE_OF_DECLARE(rk_timer, "rockchip,rk3288-timer", rk_timer_init);
+static void __init rk3288_timer_init(struct device_node *np)
+{
+ bc_timer.ctrl = TIMER_CONTROL_REG3288;
+ rk_timer_init(np);
+}
+
+static void __init rk3399_timer_init(struct device_node *np)
+{
+ bc_timer.ctrl = TIMER_CONTROL_REG3399;
+ rk_timer_init(np);
+}
+
+CLOCKSOURCE_OF_DECLARE(rk3288_timer, "rockchip,rk3288-timer",
+ rk3288_timer_init);
+CLOCKSOURCE_OF_DECLARE(rk3399_timer, "rockchip,rk3399-timer",
+ rk3399_timer_init);

This patch will give us a little lager text size. If we do disassemble,
we can see additional LDR is called. I can accept this performance drop.
So we will send new patches.
BTW, the patch "clocksource: rockchip: remove unnecessary clear irq
before request_irq" can drop if we use this patch.

Thanks,
Huang, Tao

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