Re: [PATCH 07/13] thermal/drivers/hisi: Encapsulate register writes into helpers

Leo Yan
2017-09-02T02:09:28Z

On Wed, Aug 30, 2017 at 10:47:31AM +0200, Daniel Lezcano wrote:
> Hopefully, the function name can help to clarify the semantic of the operations
> when writing in the register.
>
> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
> ---
> drivers/thermal/hisi_thermal.c | 96 +++++++++++++++++++++++++++++++-----------
> 1 file changed, 72 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/thermal/hisi_thermal.c b/drivers/thermal/hisi_thermal.c
> index 6f0dab1..d77a938 100644
> --- a/drivers/thermal/hisi_thermal.c
> +++ b/drivers/thermal/hisi_thermal.c
> @@ -26,6 +26,7 @@
>
> #include "thermal_core.h"
>
> +#define TEMP0_LAG (0x0)
> #define TEMP0_TH (0x4)
> #define TEMP0_RST_TH (0x8)
> #define TEMP0_CFG (0xC)
> @@ -96,6 +97,56 @@ static inline long hisi_thermal_round_temp(int temp)
> hisi_thermal_temp_to_step(temp));
> }
>
> +static inline void hisi_thermal_set_lag(void __iomem *addr, int value)
> +{
> + writel(value, addr + TEMP0_LAG);
> +}
> +
> +static inline void hisi_thermal_alarm_clear(void __iomem *addr, int value)
> +{
> + writel(value, addr + TEMP0_INT_CLR);
> +}
> +
> +static inline void hisi_thermal_alarm_enable(void __iomem *addr, int value)
> +{
> + writel(value, addr + TEMP0_INT_EN);
> +}
> +
> +static inline void hisi_thermal_alarm_set(void __iomem *addr, int temp)
> +{
> + writel(hisi_thermal_temp_to_step(temp) | 0x0FFFFFF00, addr + TEMP0_TH);
> +}
> +
> +static inline void hisi_thermal_reset_set(void __iomem *addr, int temp)
> +{
> + writel(hisi_thermal_temp_to_step(temp), addr + TEMP0_RST_TH);
> +}
> +
> +static inline void hisi_thermal_reset_enable(void __iomem *addr, int value)
> +{
> + writel(value, addr + TEMP0_RST_MSK);
> +}
> +
> +static inline void hisi_thermal_enable(void __iomem *addr, int value)
> +{
> + writel(value, addr + TEMP0_EN);
> +}
> +
> +static inline void hisi_thermal_sensor_select(void __iomem *addr, int sensor)
> +{
> + writel((sensor << 12), addr + TEMP0_CFG);
> +}
> +
> +static inline int hisi_thermal_get_temperature(void __iomem *addr)
> +{
> + return hisi_thermal_step_to_temp(readl(addr + TEMP0_VALUE));
> +}
> +
> +static inline void hisi_thermal_hdak_set(void __iomem *addr, int value)
> +{
> + writel(value, addr + TEMP0_CFG);
> +}

hdak and sensor id setting share the same one register, so it's
possible to overwrite their value with each other. And for hdak
setting, it should offset 4 bits.

The issues are exists in old code yet but not introduce by this
patch. Could fix these issues as well in this patch?

> +
> static long hisi_thermal_get_sensor_temp(struct hisi_thermal_data *data,
> struct hisi_thermal_sensor *sensor)
> {
> @@ -104,22 +155,21 @@ static long hisi_thermal_get_sensor_temp(struct hisi_thermal_data *data,
> mutex_lock(&data->thermal_lock);
>
> /* disable interrupt */
> - writel(0x0, data->regs + TEMP0_INT_EN);
> - writel(0x1, data->regs + TEMP0_INT_CLR);
> + hisi_thermal_alarm_enable(data->regs, 0);
> + hisi_thermal_alarm_clear(data->regs, 1);
>
> /* disable module firstly */
> - writel(0x0, data->regs + TEMP0_EN);
> + hisi_thermal_enable(data->regs, 0);
>
> /* select sensor id */
> - writel((sensor->id << 12), data->regs + TEMP0_CFG);
> + hisi_thermal_sensor_select(data->regs, sensor->id);
>
> /* enable module */
> - writel(0x1, data->regs + TEMP0_EN);
> + hisi_thermal_enable(data->regs, 1);
>
> usleep_range(3000, 5000);
>
> - val = readl(data->regs + TEMP0_VALUE);
> - val = hisi_thermal_step_to_temp(val);
> + val = hisi_thermal_get_temperature(data->regs);
>
> mutex_unlock(&data->thermal_lock);
>
> @@ -136,29 +186,27 @@ static void hisi_thermal_enable_bind_irq_sensor
> sensor = &data->sensors;
>
> /* setting the hdak time */
> - writel(0x0, data->regs + TEMP0_CFG);
> + hisi_thermal_hdak_set(data->regs, 0);
>
> /* disable module firstly */
> - writel(0x0, data->regs + TEMP0_RST_MSK);
> - writel(0x0, data->regs + TEMP0_EN);
> + hisi_thermal_reset_enable(data->regs, 0);
> + hisi_thermal_enable(data->regs, 0);
>
> /* select sensor id */
> - writel((sensor->id << 12), data->regs + TEMP0_CFG);
> + hisi_thermal_sensor_select(data->regs, sensor->id);
>
> /* enable for interrupt */
> - writel(hisi_thermal_temp_to_step(sensor->thres_temp) | 0x0FFFFFF00,
> - data->regs + TEMP0_TH);
> + hisi_thermal_alarm_set(data->regs, sensor->thres_temp);
>
> - writel(hisi_thermal_temp_to_step(HISI_TEMP_RESET),
> - data->regs + TEMP0_RST_TH);
> + hisi_thermal_reset_set(data->regs, HISI_TEMP_RESET);
>
> /* enable module */
> - writel(0x1, data->regs + TEMP0_RST_MSK);
> - writel(0x1, data->regs + TEMP0_EN);
> -
> - writel(0x0, data->regs + TEMP0_INT_CLR);
> - writel(0x1, data->regs + TEMP0_INT_EN);
> + hisi_thermal_reset_enable(data->regs, 1);
> + hisi_thermal_enable(data->regs, 1);
>
> + hisi_thermal_alarm_clear(data->regs, 0);
> + hisi_thermal_alarm_enable(data->regs, 1);
> +

whitespace error.

> usleep_range(3000, 5000);
>
> mutex_unlock(&data->thermal_lock);
> @@ -169,10 +217,10 @@ static void hisi_thermal_disable_sensor(struct hisi_thermal_data *data)
> mutex_lock(&data->thermal_lock);
>
> /* disable sensor module */
> - writel(0x0, data->regs + TEMP0_INT_EN);
> - writel(0x0, data->regs + TEMP0_RST_MSK);
> - writel(0x0, data->regs + TEMP0_EN);
> -
> + hisi_thermal_enable(data->regs, 0);
> + hisi_thermal_alarm_enable(data->regs, 0);
> + hisi_thermal_reset_enable(data->regs, 0);
> +

whitespace error.

> mutex_unlock(&data->thermal_lock);
> }
>
> --
> 2.7.4
>