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charset="utf-8" From: Wei Fu This patch add Counter Prescaler support in APM X-Gene RTC driver by getting prescaler (Optional) property value from dtb. Signed-off-by: Wei Fu --- drivers/rtc/Kconfig | 10 ++++++++++ drivers/rtc/rtc-xgene.c | 31 +++++++++++++++++++++++++++++++ 2 files changed, 41 insertions(+) diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index c63e32d012f2..3a89f1e6095d 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1888,6 +1888,16 @@ config RTC_DRV_XGENE This driver can also be built as a module, if so, the module will be called "rtc-xgene". =20 +config RTC_DRV_XGENE_PRESCALER + bool "Pre-scaler Counter support for APM X-Gene RTC driver" + depends on RTC_DRV_XGENE + depends on ARCH_THEAD + default y + help + Say Y here if your Soc has Pre-scaler Counter support on rtc-xgene. + + This hardware support can only be found in DW_apb_rtc after v2.06a. + config RTC_DRV_PIC32 tristate "Microchip PIC32 RTC" depends on MACH_PIC32 diff --git a/drivers/rtc/rtc-xgene.c b/drivers/rtc/rtc-xgene.c index f78efc9760c0..4d6f1629b973 100644 --- a/drivers/rtc/rtc-xgene.c +++ b/drivers/rtc/rtc-xgene.c @@ -26,11 +26,13 @@ #define RTC_CCR_MASK BIT(1) #define RTC_CCR_EN BIT(2) #define RTC_CCR_WEN BIT(3) +#define RTC_CCR_PSCLR_EN BIT(4) #define RTC_STAT 0x10 #define RTC_STAT_BIT BIT(0) #define RTC_RSTAT 0x14 #define RTC_EOI 0x18 #define RTC_VER 0x1C +#define RTC_CPSR 0x20 =20 struct xgene_rtc_dev { struct rtc_device *rtc; @@ -40,6 +42,33 @@ struct xgene_rtc_dev { unsigned int irq_enabled; }; =20 +static void xgene_rtc_set_prescaler(struct device *dev) +{ +#ifdef CONFIG_RTC_DRV_XGENE_PRESCALER + u32 ccr; + u32 prescaler; + struct xgene_rtc_dev *pdata =3D dev_get_drvdata(dev); + + if (device_property_read_u32(dev, "prescaler", &prescaler)) { + dev_warn(dev, "Missing the pre-scaler config for RTC.\n"); + dev_warn(dev, "The current pre-scaler config is 0x%x.\n", + readl(pdata->csr_base + RTC_CPSR)); + return; + } + + /* The clock source on some platform to RTC is NOT 1HZ, + * so we need to prescale the clock to make the input clock become 1HZ, + * like (clock_source/prescaler) =3D 1HZ + */ + writel(prescaler, pdata->csr_base + RTC_CPSR); + + /* enable RTC Prescaler feature in CCR register */ + ccr =3D readl(pdata->csr_base + RTC_CCR); + ccr |=3D RTC_CCR_PSCLR_EN; + writel(ccr, pdata->csr_base + RTC_CCR); +#endif /* CONFIG_RTC_DRV_XGENE_PRESCALER */ +} + static int xgene_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct xgene_rtc_dev *pdata =3D dev_get_drvdata(dev); @@ -174,6 +203,8 @@ static int xgene_rtc_probe(struct platform_device *pdev) /* Turn on the clock and the crystal */ writel(RTC_CCR_EN, pdata->csr_base + RTC_CCR); =20 + xgene_rtc_set_prescaler(&pdev->dev); + ret =3D device_init_wakeup(&pdev->dev, 1); if (ret) { clk_disable_unprepare(pdata->clk); --=20 2.44.0