On Tuesday 18 April 2017 10:50 AM, Keerthy wrote:
> From: Russ Dill <Russ.Dill@xxxxxx>
>
> Many RTCs provide scratch registers that are maintained so long as the RTC
> has power. Provide a generic method to access these registers.
>
A gentle ping on this
> Signed-off-by: Russ Dill <Russ.Dill@xxxxxx>
> Signed-off-by: Keerthy <j-keerthy@xxxxxx>
> ---
> drivers/rtc/interface.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++++
> drivers/rtc/rtc-omap.c | 35 ++++++++++++++++++++++++++++++++++
> include/linux/rtc.h | 7 +++++++
> 3 files changed, 92 insertions(+)
>
> diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
> index fc0fa75..facde06 100644
> --- a/drivers/rtc/interface.c
> +++ b/drivers/rtc/interface.c
> @@ -1016,3 +1016,53 @@ int rtc_set_offset(struct rtc_device *rtc, long offset)
> mutex_unlock(&rtc->ops_lock);
> return ret;
> }
> +
> +/* rtc_read_scratch - Read from RTC scratch register
> + * @ rtc: rtc device to be used
> + * @ index: index of scratch register
> + * @ value: returned value read
> + *
> + * Kernel interface read from an RTC scratch register
> + */
> +int rtc_read_scratch(struct rtc_device *rtc, unsigned int index, u32 *value)
> +{
> + int err;
> +
> + mutex_lock(&rtc->ops_lock);
> + if (!rtc->ops)
> + err = -ENODEV;
> + else if (index >= rtc->ops->scratch_size || !rtc->ops->read_scratch)
> + err = -EINVAL;
> + else
> + err = rtc->ops->read_scratch(rtc->dev.parent, index, value);
> + mutex_unlock(&rtc->ops_lock);
> + return err;
> +}
> +EXPORT_SYMBOL_GPL(rtc_read_scratch);
> +
> +/* rtc_write_scratch - Write to RTC scratch register
> + * @ rtc: rtc device to be used
> + * @ index: index of scratch register
> + * @ value: value to write
> + *
> + * Kernel interface write to an RTC scratch register
> + */
> +int rtc_write_scratch(struct rtc_device *rtc, unsigned int index, u32 value)
> +{
> + int err;
> +
> + mutex_lock(&rtc->ops_lock);
> +
> + if (!rtc->ops)
> + err = -ENODEV;
> + else if (index >= rtc->ops->scratch_size ||
> + !rtc->ops->write_scratch)
> + err = -EINVAL;
> + else
> + err = rtc->ops->write_scratch(rtc->dev.parent, index, value);
> +
> + mutex_unlock(&rtc->ops_lock);
> +
> + return err;
> +}
> +EXPORT_SYMBOL_GPL(rtc_write_scratch);
> diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
> index 13f7cd1..c90d93e 100644
> --- a/drivers/rtc/rtc-omap.c
> +++ b/drivers/rtc/rtc-omap.c
> @@ -70,6 +70,10 @@
> #define OMAP_RTC_COMP_MSB_REG 0x50
> #define OMAP_RTC_OSC_REG 0x54
>
> +#define OMAP_RTC_SCRATCH0_REG 0x60
> +#define OMAP_RTC_SCRATCH1_REG 0x64
> +#define OMAP_RTC_SCRATCH2_REG 0x68
> +
> #define OMAP_RTC_KICK0_REG 0x6c
> #define OMAP_RTC_KICK1_REG 0x70
>
> @@ -414,6 +418,34 @@ static int omap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
>
> static struct omap_rtc *omap_rtc_power_off_rtc;
>
> +static const u32 omap_rtc_scratch_regs[] = {
> + OMAP_RTC_SCRATCH0_REG,
> + OMAP_RTC_SCRATCH1_REG,
> + OMAP_RTC_SCRATCH2_REG,
> +};
> +
> +static int omap_rtc_read_scratch(struct device *dev, unsigned int index,
> + u32 *value)
> +{
> + *value = readl(omap_rtc_power_off_rtc->base +
> + omap_rtc_scratch_regs[index]);
> +
> + return 0;
> +}
> +
> +static int omap_rtc_write_scratch(struct device *dev, unsigned int index,
> + u32 value)
> +{
> + struct omap_rtc *rtc = dev_get_drvdata(dev);
> +
> + rtc->type->unlock(rtc);
> + writel(value, omap_rtc_power_off_rtc->base +
> + omap_rtc_scratch_regs[index]);
> + rtc->type->lock(rtc);
> +
> + return 0;
> +}
> +
> /*
> * omap_rtc_poweroff: RTC-controlled power off
> *
> @@ -484,6 +516,9 @@ static void omap_rtc_power_off(void)
> .read_alarm = omap_rtc_read_alarm,
> .set_alarm = omap_rtc_set_alarm,
> .alarm_irq_enable = omap_rtc_alarm_irq_enable,
> + .read_scratch = omap_rtc_read_scratch,
> + .write_scratch = omap_rtc_write_scratch,
> + .scratch_size = ARRAY_SIZE(omap_rtc_scratch_regs),
> };
>
> static const struct omap_rtc_device_type omap_rtc_default_type = {
> diff --git a/include/linux/rtc.h b/include/linux/rtc.h
> index b693ada..da5e003 100644
> --- a/include/linux/rtc.h
> +++ b/include/linux/rtc.h
> @@ -91,6 +91,10 @@ struct rtc_class_ops {
> int (*alarm_irq_enable)(struct device *, unsigned int enabled);
> int (*read_offset)(struct device *, long *offset);
> int (*set_offset)(struct device *, long offset);
> + int (*read_scratch)(struct device *, unsigned int, u32*);
> + int (*write_scratch)(struct device *, unsigned int, u32);
> +
> + unsigned int scratch_size;
> };
>
> #define RTC_DEVICE_NAME_SIZE 20
> @@ -214,6 +218,9 @@ int rtc_timer_start(struct rtc_device *rtc, struct rtc_timer *timer,
> int rtc_set_offset(struct rtc_device *rtc, long offset);
> void rtc_timer_do_work(struct work_struct *work);
>
> +int rtc_read_scratch(struct rtc_device *rtc, unsigned int index, u32 *value);
> +int rtc_write_scratch(struct rtc_device *rtc, unsigned int index, u32 value);
> +
> static inline bool is_leap_year(unsigned int year)
> {
> return (!(year % 4) && (year % 100)) || !(year % 400);
>
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