This patch adds support for the STM32 RTC. Signed-off-by: Amelie Delaunay <amelie.delaunay@xxxxxx> --- drivers/rtc/Kconfig | 10 + drivers/rtc/Makefile | 1 + drivers/rtc/rtc-stm32.c | 777 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 788 insertions(+) create mode 100644 drivers/rtc/rtc-stm32.c diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index e859d14..dd8b218 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -1706,6 +1706,16 @@ config RTC_DRV_PIC32 This driver can also be built as a module. If so, the module will be called rtc-pic32 +config RTC_DRV_STM32 + tristate "STM32 On-Chip RTC" + depends on ARCH_STM32 + help + If you say yes here you get support for the STM32 On-Chip + Real Time Clock. + + This driver can also be built as a module, if so, the module + will be called "rtc-stm32". + comment "HID Sensor RTC drivers" config RTC_DRV_HID_SENSOR_TIME diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 1ac694a..87bd9cc 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -144,6 +144,7 @@ obj-$(CONFIG_RTC_DRV_SNVS) += rtc-snvs.o obj-$(CONFIG_RTC_DRV_SPEAR) += rtc-spear.o obj-$(CONFIG_RTC_DRV_STARFIRE) += rtc-starfire.o obj-$(CONFIG_RTC_DRV_STK17TA8) += rtc-stk17ta8.o +obj-$(CONFIG_RTC_DRV_STM32) += rtc-stm32.o obj-$(CONFIG_RTC_DRV_STMP) += rtc-stmp3xxx.o obj-$(CONFIG_RTC_DRV_ST_LPC) += rtc-st-lpc.o obj-$(CONFIG_RTC_DRV_SUN4V) += rtc-sun4v.o diff --git a/drivers/rtc/rtc-stm32.c b/drivers/rtc/rtc-stm32.c new file mode 100644 index 0000000..9e710ff --- /dev/null +++ b/drivers/rtc/rtc-stm32.c @@ -0,0 +1,777 @@ +/* + * Copyright (C) Amelie Delaunay 2015 + * Author: Amelie Delaunay <adelaunay.stm32@xxxxxxxxx> + * License terms: GNU General Public License (GPL), version 2 + */ + +#include <linux/bcd.h> +#include <linux/clk.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/ioport.h> +#include <linux/kernel.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/rtc.h> +#include <linux/spinlock.h> + +#define DRIVER_NAME "stm32_rtc" + +/* STM32 RTC registers */ +#define STM32_RTC_TR 0x00 +#define STM32_RTC_DR 0x04 +#define STM32_RTC_CR 0x08 +#define STM32_RTC_ISR 0x0C +#define STM32_RTC_PRER 0x10 +#define STM32_RTC_ALRMAR 0x1C +#define STM32_RTC_WPR 0x24 + +/* STM32_RTC_TR bit fields */ +#define STM32_RTC_TR_SEC_SHIFT 0 +#define STM32_RTC_TR_SEC GENMASK(6, 0) +#define STM32_RTC_TR_MIN_SHIFT 8 +#define STM32_RTC_TR_MIN GENMASK(14, 8) +#define STM32_RTC_TR_HOUR_SHIFT 16 +#define STM32_RTC_TR_HOUR GENMASK(21, 16) + +/* STM32_RTC_DR bit fields */ +#define STM32_RTC_DR_DATE_SHIFT 0 +#define STM32_RTC_DR_DATE GENMASK(5, 0) +#define STM32_RTC_DR_MONTH_SHIFT 8 +#define STM32_RTC_DR_MONTH GENMASK(11, 8) +#define STM32_RTC_DR_WDAY_SHIFT 13 +#define STM32_RTC_DR_WDAY GENMASK(15, 13) +#define STM32_RTC_DR_YEAR_SHIFT 16 +#define STM32_RTC_DR_YEAR GENMASK(23, 16) + +/* STM32_RTC_CR bit fields */ +#define STM32_RTC_CR_FMT BIT(6) +#define STM32_RTC_CR_ALRAE BIT(8) +#define STM32_RTC_CR_ALRAIE BIT(12) + +/* STM32_RTC_ISR bit fields */ +#define STM32_RTC_ISR_ALRAWF BIT(0) +#define STM32_RTC_ISR_INITS BIT(4) +#define STM32_RTC_ISR_RSF BIT(5) +#define STM32_RTC_ISR_INITF BIT(6) +#define STM32_RTC_ISR_INIT BIT(7) +#define STM32_RTC_ISR_ALRAF BIT(8) + +/* STM32_RTC_PRER bit fields */ +#define STM32_RTC_PRER_PRED_S_SHIFT 0 +#define STM32_RTC_PRER_PRED_S GENMASK(14, 0) +#define STM32_RTC_PRER_PRED_A_SHIFT 16 +#define STM32_RTC_PRER_PRED_A GENMASK(22, 16) + +/* STM32_RTC_ALRMAR and STM32_RTC_ALRMBR bit fields */ +#define STM32_RTC_ALRMXR_SEC_SHIFT 0 +#define STM32_RTC_ALRMXR_SEC GENMASK(6, 0) +#define STM32_RTC_ALRMXR_SEC_MASK BIT(7) +#define STM32_RTC_ALRMXR_MIN_SHIFT 8 +#define STM32_RTC_ALRMXR_MIN GENMASK(14, 8) +#define STM32_RTC_ALRMXR_MIN_MASK BIT(15) +#define STM32_RTC_ALRMXR_HOUR_SHIFT 16 +#define STM32_RTC_ALRMXR_HOUR GENMASK(21, 16) +#define STM32_RTC_ALRMXR_PM BIT(22) +#define STM32_RTC_ALRMXR_HOUR_MASK BIT(23) +#define STM32_RTC_ALRMXR_DATE_SHIFT 24 +#define STM32_RTC_ALRMXR_DATE GENMASK(29, 24) +#define STM32_RTC_ALRMXR_WDSEL BIT(30) +#define STM32_RTC_ALRMXR_WDAY_SHIFT 24 +#define STM32_RTC_ALRMXR_WDAY GENMASK(27, 24) +#define STM32_RTC_ALRMXR_DATE_MASK BIT(31) + +/* STM32_RTC_WPR key constants */ +#define RTC_WPR_1ST_KEY 0xCA +#define RTC_WPR_2ND_KEY 0x53 +#define RTC_WPR_WRONG_KEY 0xFF + +/* + * RTC registers are protected agains parasitic write access. + * PWR_CR_DBP bit must be set to enable write access to RTC registers. + */ +/* STM32_PWR_CR */ +#define PWR_CR 0x00 +/* STM32_PWR_CR bit field */ +#define PWR_CR_DBP BIT(8) + +static struct regmap *dbp; + +struct stm32_rtc { + struct rtc_device *rtc_dev; + void __iomem *base; + struct clk *pclk; + struct clk *ck_rtc; + unsigned int clksrc; + spinlock_t lock; /* Protects registers accesses */ + int irq_alarm; + struct regmap *pwrcr; +}; + +static inline unsigned int stm32_rtc_readl(struct stm32_rtc *rtc, + unsigned int offset) +{ + return readl_relaxed(rtc->base + offset); +} + +static inline void stm32_rtc_writel(struct stm32_rtc *rtc, + unsigned int offset, unsigned int value) +{ + writel_relaxed(value, rtc->base + offset); +} + +static void stm32_rtc_wpr_unlock(struct stm32_rtc *rtc) +{ +// if (dbp) +// regmap_update_bits(dbp, PWR_CR, PWR_CR_DBP, PWR_CR_DBP); + + stm32_rtc_writel(rtc, STM32_RTC_WPR, RTC_WPR_1ST_KEY); + stm32_rtc_writel(rtc, STM32_RTC_WPR, RTC_WPR_2ND_KEY); +} + +static void stm32_rtc_wpr_lock(struct stm32_rtc *rtc) +{ + stm32_rtc_writel(rtc, STM32_RTC_WPR, RTC_WPR_WRONG_KEY); + +// if (dbp) +// regmap_update_bits(dbp, PWR_CR, PWR_CR_DBP, ~PWR_CR_DBP); +} + +static int stm32_rtc_enter_init_mode(struct stm32_rtc *rtc) +{ + unsigned int isr = stm32_rtc_readl(rtc, STM32_RTC_ISR); + + if (!(isr & STM32_RTC_ISR_INITF)) { + isr |= STM32_RTC_ISR_INIT; + stm32_rtc_writel(rtc, STM32_RTC_ISR, isr); + + return readl_relaxed_poll_timeout_atomic( + rtc->base + STM32_RTC_ISR, + isr, (isr & STM32_RTC_ISR_INITF), + 10, 100000); + } + + return 0; +} + +static void stm32_rtc_exit_init_mode(struct stm32_rtc *rtc) +{ + unsigned int isr = stm32_rtc_readl(rtc, STM32_RTC_ISR); + + isr &= ~STM32_RTC_ISR_INIT; + stm32_rtc_writel(rtc, STM32_RTC_ISR, isr); +} + +static int stm32_rtc_wait_sync(struct stm32_rtc *rtc) +{ + unsigned int isr; + + isr = stm32_rtc_readl(rtc, STM32_RTC_ISR); + + isr &= ~STM32_RTC_ISR_RSF; + stm32_rtc_writel(rtc, STM32_RTC_ISR, isr); + + /* Wait the registers to be synchronised */ + return readl_relaxed_poll_timeout_atomic(rtc->base + STM32_RTC_ISR, + isr, + (isr & STM32_RTC_ISR_RSF), + 10, 100000); +} + +static irqreturn_t stm32_rtc_alarm_irq(int irq, void *dev_id) +{ + struct stm32_rtc *rtc = (struct stm32_rtc *)dev_id; + unsigned long irqflags, events = 0; + unsigned int isr, cr; + + spin_lock_irqsave(&rtc->lock, irqflags); + + isr = stm32_rtc_readl(rtc, STM32_RTC_ISR); + cr = stm32_rtc_readl(rtc, STM32_RTC_CR); + + if ((isr & STM32_RTC_ISR_ALRAF) && + (cr & STM32_RTC_CR_ALRAIE)) { + /* Alarm A flag - Alarm interrupt */ + events |= RTC_IRQF | RTC_AF; + isr &= ~STM32_RTC_ISR_ALRAF; + } + + /* Clear event irqflags, otherwise new events won't be received */ + stm32_rtc_writel(rtc, STM32_RTC_ISR, isr); + + spin_unlock_irqrestore(&rtc->lock, irqflags); + + if (events) { + dev_info(&rtc->rtc_dev->dev, "Alarm occurred\n"); + + /* Pass event to the kernel */ + rtc_update_irq(rtc->rtc_dev, 1, events); + return IRQ_HANDLED; + } else { + return IRQ_NONE; + } +} + +/* Convert rtc_time structure from bin to bcd format */ +static void tm2bcd(struct rtc_time *tm) +{ + tm->tm_sec = bin2bcd(tm->tm_sec); + tm->tm_min = bin2bcd(tm->tm_min); + tm->tm_hour = bin2bcd(tm->tm_hour); + + tm->tm_mday = bin2bcd(tm->tm_mday); + tm->tm_mon = bin2bcd(tm->tm_mon + 1); + tm->tm_year = bin2bcd(tm->tm_year - 100); + /* + * Number of days since Sunday + * - on kernel side, 0=Sunday...6=Saturday + * - on rtc side, 0=invalid,1=Monday...7=Sunday + */ + tm->tm_wday = (!tm->tm_wday) ? 7 : tm->tm_wday; +} + +/* Convert rtc_time structure from bcd to bin format */ +static void bcd2tm(struct rtc_time *tm) +{ + tm->tm_sec = bcd2bin(tm->tm_sec); + tm->tm_min = bcd2bin(tm->tm_min); + tm->tm_hour = bcd2bin(tm->tm_hour); + + tm->tm_mday = bcd2bin(tm->tm_mday); + tm->tm_mon = bcd2bin(tm->tm_mon) - 1; + tm->tm_year = bcd2bin(tm->tm_year) + 100; + /* + * Number of days since Sunday + * - on kernel side, 0=Sunday...6=Saturday + * - on rtc side, 0=invalid,1=Monday...7=Sunday + */ + tm->tm_wday %= 7; +} + +static int stm32_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct stm32_rtc *rtc = dev_get_drvdata(dev); + unsigned int tr, dr; + unsigned long irqflags; + + spin_lock_irqsave(&rtc->lock, irqflags); + + /* Time and Date in BCD format */ + tr = stm32_rtc_readl(rtc, STM32_RTC_TR); + dr = stm32_rtc_readl(rtc, STM32_RTC_DR); + + spin_unlock_irqrestore(&rtc->lock, irqflags); + + tm->tm_sec = (tr & STM32_RTC_TR_SEC) >> STM32_RTC_TR_SEC_SHIFT; + tm->tm_min = (tr & STM32_RTC_TR_MIN) >> STM32_RTC_TR_MIN_SHIFT; + tm->tm_hour = (tr & STM32_RTC_TR_HOUR) >> STM32_RTC_TR_HOUR_SHIFT; + + tm->tm_mday = (dr & STM32_RTC_DR_DATE) >> STM32_RTC_DR_DATE_SHIFT; + tm->tm_mon = (dr & STM32_RTC_DR_MONTH) >> STM32_RTC_DR_MONTH_SHIFT; + tm->tm_year = (dr & STM32_RTC_DR_YEAR) >> STM32_RTC_DR_YEAR_SHIFT; + tm->tm_wday = (dr & STM32_RTC_DR_WDAY) >> STM32_RTC_DR_WDAY_SHIFT; + + /* We don't report tm_yday and tm_isdst */ + + bcd2tm(tm); + + if (rtc_valid_tm(tm) < 0) { + dev_err(dev, "%s: rtc_time is not valid.\n", __func__); + return -EINVAL; + } + + return 0; +} + +static int stm32_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct stm32_rtc *rtc = dev_get_drvdata(dev); + unsigned int tr, dr; + unsigned long irqflags; + int ret = 0; + + if (rtc_valid_tm(tm) < 0) { + dev_err(dev, "%s: rtc_time is not valid.\n", __func__); + return -EINVAL; + } + + tm2bcd(tm); + + /* Time in BCD format */ + tr = ((tm->tm_sec << STM32_RTC_TR_SEC_SHIFT) & STM32_RTC_TR_SEC) | + ((tm->tm_min << STM32_RTC_TR_MIN_SHIFT) & STM32_RTC_TR_MIN) | + ((tm->tm_hour << STM32_RTC_TR_HOUR_SHIFT) & STM32_RTC_TR_HOUR); + + /* Date in BCD format */ + dr = ((tm->tm_mday << STM32_RTC_DR_DATE_SHIFT) & STM32_RTC_DR_DATE) | + ((tm->tm_mon << STM32_RTC_DR_MONTH_SHIFT) & STM32_RTC_DR_MONTH) | + ((tm->tm_year << STM32_RTC_DR_YEAR_SHIFT) & STM32_RTC_DR_YEAR) | + ((tm->tm_wday << STM32_RTC_DR_WDAY_SHIFT) & STM32_RTC_DR_WDAY); + + spin_lock_irqsave(&rtc->lock, irqflags); + + stm32_rtc_wpr_unlock(rtc); + + ret = stm32_rtc_enter_init_mode(rtc); + if (ret) { + dev_err(dev, "Can't enter in init mode. Set time aborted.\n"); + goto end; + } + + stm32_rtc_writel(rtc, STM32_RTC_TR, tr); + stm32_rtc_writel(rtc, STM32_RTC_DR, dr); + + stm32_rtc_exit_init_mode(rtc); + + ret = stm32_rtc_wait_sync(rtc); +end: + stm32_rtc_wpr_lock(rtc); + + spin_unlock_irqrestore(&rtc->lock, irqflags); + + return ret; +} + +static int stm32_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct stm32_rtc *rtc = dev_get_drvdata(dev); + struct rtc_time *tm = &alrm->time; + unsigned int alrmar, cr, isr; + unsigned long irqflags; + + spin_lock_irqsave(&rtc->lock, irqflags); + + alrmar = stm32_rtc_readl(rtc, STM32_RTC_ALRMAR); + cr = stm32_rtc_readl(rtc, STM32_RTC_CR); + isr = stm32_rtc_readl(rtc, STM32_RTC_ISR); + + spin_unlock_irqrestore(&rtc->lock, irqflags); + + if (alrmar & STM32_RTC_ALRMXR_DATE_MASK) { + /* + * Date/day don't care in Alarm comparison so alarm triggers + * every day + */ + tm->tm_mday = -1; + tm->tm_wday = -1; + } else { + if (alrmar & STM32_RTC_ALRMXR_WDSEL) { + /* Alarm is set to a day of week */ + tm->tm_mday = -1; + tm->tm_wday = (alrmar & STM32_RTC_ALRMXR_WDAY) >> + STM32_RTC_ALRMXR_WDAY_SHIFT; + tm->tm_wday %= 7; + } else { + /* Alarm is set to a day of month */ + tm->tm_wday = -1; + tm->tm_mday = (alrmar & STM32_RTC_ALRMXR_DATE) >> + STM32_RTC_ALRMXR_DATE_SHIFT; + } + } + + if (alrmar & STM32_RTC_ALRMXR_HOUR_MASK) { + /* Hours don't care in Alarm comparison */ + tm->tm_hour = -1; + } else { + tm->tm_hour = (alrmar & STM32_RTC_ALRMXR_HOUR) >> + STM32_RTC_ALRMXR_HOUR_SHIFT; + if (alrmar & STM32_RTC_ALRMXR_PM) + tm->tm_hour += 12; + } + + if (alrmar & STM32_RTC_ALRMXR_MIN_MASK) { + /* Minutes don't care in Alarm comparison */ + tm->tm_min = -1; + } else { + tm->tm_min = (alrmar & STM32_RTC_ALRMXR_MIN) >> + STM32_RTC_ALRMXR_MIN_SHIFT; + } + + if (alrmar & STM32_RTC_ALRMXR_SEC_MASK) { + /* Seconds don't care in Alarm comparison */ + tm->tm_sec = -1; + } else { + tm->tm_sec = (alrmar & STM32_RTC_ALRMXR_SEC) >> + STM32_RTC_ALRMXR_SEC_SHIFT; + } + + bcd2tm(tm); + + alrm->enabled = (cr & STM32_RTC_CR_ALRAE) ? 1 : 0; + alrm->pending = (isr & STM32_RTC_ISR_ALRAF) ? 1 : 0; + + return 0; +} + +static int stm32_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) +{ + struct stm32_rtc *rtc = dev_get_drvdata(dev); + unsigned long irqflags; + unsigned int isr, cr; + + cr = stm32_rtc_readl(rtc, STM32_RTC_CR); + + spin_lock_irqsave(&rtc->lock, irqflags); + + stm32_rtc_wpr_unlock(rtc); + + /* We expose Alarm A to the kernel */ + if (enabled) + cr |= (STM32_RTC_CR_ALRAIE | STM32_RTC_CR_ALRAE); + else + cr &= ~(STM32_RTC_CR_ALRAIE | STM32_RTC_CR_ALRAE); + stm32_rtc_writel(rtc, STM32_RTC_CR, cr); + + /* Clear event irqflags, otherwise new events won't be received */ + isr = stm32_rtc_readl(rtc, STM32_RTC_ISR); + isr &= ~STM32_RTC_ISR_ALRAF; + stm32_rtc_writel(rtc, STM32_RTC_ISR, isr); + + stm32_rtc_wpr_lock(rtc); + + spin_unlock_irqrestore(&rtc->lock, irqflags); + + return 0; +} + +static int stm32_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) +{ + struct stm32_rtc *rtc = dev_get_drvdata(dev); + struct rtc_time *tm = &alrm->time; + unsigned long irqflags; + unsigned int cr, isr, alrmar; + int ret = 0; + + if (rtc_valid_tm(tm)) { + dev_err(dev, "Alarm time not valid.\n"); + return -EINVAL; + } + + tm2bcd(tm); + + spin_lock_irqsave(&rtc->lock, irqflags); + + stm32_rtc_wpr_unlock(rtc); + + /* Disable Alarm */ + cr = stm32_rtc_readl(rtc, STM32_RTC_CR); + cr &= ~STM32_RTC_CR_ALRAE; + stm32_rtc_writel(rtc, STM32_RTC_CR, cr); + + /* Poll Alarm write flag to be sure that Alarm update is allowed */ + ret = readl_relaxed_poll_timeout_atomic(rtc->base + STM32_RTC_ISR, + isr, + (isr & STM32_RTC_ISR_ALRAWF), + 10, 100); + + if (ret) { + dev_err(dev, "Alarm update not allowed\n"); + goto end; + } + + alrmar = 0; + + if (tm->tm_mday < 0 && tm->tm_wday < 0) { + /* + * Date/day don't care in Alarm comparison so alarm triggers + * every day + */ + alrmar |= STM32_RTC_ALRMXR_DATE_MASK; + } else { + if (tm->tm_mday > 0) { + /* Date is selected (ignoring wday) */ + alrmar |= (tm->tm_mday << STM32_RTC_ALRMXR_DATE_SHIFT) & + STM32_RTC_ALRMXR_DATE; + } else { + /* Day of week is selected */ + int wday = (tm->tm_wday == 0) ? 7 : tm->tm_wday; + + alrmar |= STM32_RTC_ALRMXR_WDSEL; + alrmar |= (wday << STM32_RTC_ALRMXR_WDAY_SHIFT) & + STM32_RTC_ALRMXR_WDAY; + } + } + + if (tm->tm_hour < 0) { + /* Hours don't care in Alarm comparison */ + alrmar |= STM32_RTC_ALRMXR_HOUR_MASK; + } else { + /* 24-hour format */ + alrmar &= ~STM32_RTC_ALRMXR_PM; + alrmar |= (tm->tm_hour << STM32_RTC_ALRMXR_HOUR_SHIFT) & + STM32_RTC_ALRMXR_HOUR; + } + + if (tm->tm_min < 0) { + /* Minutes don't care in Alarm comparison */ + alrmar |= STM32_RTC_ALRMXR_MIN_MASK; + } else { + alrmar |= (tm->tm_min << STM32_RTC_ALRMXR_MIN_SHIFT) & + STM32_RTC_ALRMXR_MIN; + } + + if (tm->tm_sec < 0) { + /* Seconds don't care in Alarm comparison */ + alrmar |= STM32_RTC_ALRMXR_SEC_MASK; + } else { + alrmar |= (tm->tm_sec << STM32_RTC_ALRMXR_SEC_SHIFT) & + STM32_RTC_ALRMXR_SEC; + } + + /* Write to Alarm register */ + stm32_rtc_writel(rtc, STM32_RTC_ALRMAR, alrmar); + + if (alrm->enabled) + stm32_rtc_alarm_irq_enable(dev, 1); + else + stm32_rtc_alarm_irq_enable(dev, 0); + +end: + stm32_rtc_wpr_lock(rtc); + + spin_unlock_irqrestore(&rtc->lock, irqflags); + + return ret; +} + +static const struct rtc_class_ops stm32_rtc_ops = { + .read_time = stm32_rtc_read_time, + .set_time = stm32_rtc_set_time, + .read_alarm = stm32_rtc_read_alarm, + .set_alarm = stm32_rtc_set_alarm, + .alarm_irq_enable = stm32_rtc_alarm_irq_enable, +}; + +#ifdef CONFIG_OF +static const struct of_device_id stm32_rtc_of_match[] = { + { .compatible = "st,stm32-rtc" }, + {} +}; +MODULE_DEVICE_TABLE(of, stm32_rtc_of_match); +#endif + +static int stm32_rtc_init(struct platform_device *pdev, + struct stm32_rtc *rtc) +{ + unsigned int prer, pred_a, pred_s, pred_a_max, pred_s_max, cr; + unsigned int rate; + unsigned long irqflags; + int ret = 0; + + rate = clk_get_rate(rtc->ck_rtc); + + /* Find prediv_a and prediv_s to obtain the 1Hz calendar clock */ + pred_a_max = STM32_RTC_PRER_PRED_A >> STM32_RTC_PRER_PRED_A_SHIFT; + pred_s_max = STM32_RTC_PRER_PRED_S >> STM32_RTC_PRER_PRED_S_SHIFT; + + for (pred_a = pred_a_max; pred_a >= 0; pred_a--) { + pred_s = (rate / (pred_a + 1)) - 1; + + if (((pred_s + 1) * (pred_a + 1)) == rate) + break; + } + + /* + * Can't find a 1Hz, so give priority to RTC power consumption + * by choosing the higher possible value for prediv_a + */ + if ((pred_s > pred_s_max) || (pred_a > pred_a_max)) { + pred_a = pred_a_max; + pred_s = (rate / (pred_a + 1)) - 1; + + dev_warn(&pdev->dev, "ck_rtc is %s\n", + (rate - ((pred_a + 1) * (pred_s + 1)) < 0) ? + "fast" : "slow"); + } + + spin_lock_irqsave(&rtc->lock, irqflags); + + stm32_rtc_wpr_unlock(rtc); + + ret = stm32_rtc_enter_init_mode(rtc); + if (ret) { + dev_err(&pdev->dev, + "Can't enter in init mode. Prescaler config failed.\n"); + goto end; + } + + prer = (pred_s << STM32_RTC_PRER_PRED_S_SHIFT) & STM32_RTC_PRER_PRED_S; + stm32_rtc_writel(rtc, STM32_RTC_PRER, prer); + prer |= (pred_a << STM32_RTC_PRER_PRED_A_SHIFT) & STM32_RTC_PRER_PRED_A; + stm32_rtc_writel(rtc, STM32_RTC_PRER, prer); + + /* Force 24h time format */ + cr = stm32_rtc_readl(rtc, STM32_RTC_CR); + cr &= ~STM32_RTC_CR_FMT; + stm32_rtc_writel(rtc, STM32_RTC_CR, cr); + + stm32_rtc_exit_init_mode(rtc); + + ret = stm32_rtc_wait_sync(rtc); + + if (stm32_rtc_readl(rtc, STM32_RTC_ISR) & STM32_RTC_ISR_INITS) + dev_warn(&pdev->dev, "Date/Time must be initialized\n"); +end: + stm32_rtc_wpr_lock(rtc); + + spin_unlock_irqrestore(&rtc->lock, irqflags); + + return ret; +} + +static int stm32_rtc_probe(struct platform_device *pdev) +{ + struct stm32_rtc *rtc; + struct resource *res; + int ret; + + rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); + if (!rtc) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + rtc->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(rtc->base)) + return PTR_ERR(rtc->base); + + dbp = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "st,syscfg"); + if (IS_ERR(dbp)) { + dev_err(&pdev->dev, "no st,syscfg\n"); + return PTR_ERR(dbp); + } + + spin_lock_init(&rtc->lock); + + rtc->ck_rtc = devm_clk_get(&pdev->dev, "ck_rtc"); + if (IS_ERR(rtc->ck_rtc)) { + dev_err(&pdev->dev, "no ck_rtc clock"); + return PTR_ERR(rtc->ck_rtc); + } + + ret = clk_prepare_enable(rtc->ck_rtc); + if (ret) + return ret; + + if (dbp) + regmap_update_bits(dbp, PWR_CR, PWR_CR_DBP, PWR_CR_DBP); + + ret = stm32_rtc_init(pdev, rtc); + if (ret) + goto err; + + rtc->irq_alarm = platform_get_irq_byname(pdev, "alarm"); + if (rtc->irq_alarm <= 0) { + dev_err(&pdev->dev, "no alarm irq\n"); + ret = -ENOENT; + goto err; + } + + platform_set_drvdata(pdev, rtc); + + device_init_wakeup(&pdev->dev, true); + + rtc->rtc_dev = devm_rtc_device_register(&pdev->dev, pdev->name, + &stm32_rtc_ops, THIS_MODULE); + if (IS_ERR(rtc->rtc_dev)) { + ret = PTR_ERR(rtc->rtc_dev); + dev_err(&pdev->dev, "rtc device registration failed, err=%d\n", + ret); + goto err; + } + + /* Handle RTC alarm interrupts */ + ret = devm_request_irq(&pdev->dev, rtc->irq_alarm, + stm32_rtc_alarm_irq, IRQF_TRIGGER_RISING, + dev_name(&rtc->rtc_dev->dev), rtc); + if (ret) { + dev_err(&pdev->dev, "IRQ%d (alarm interrupt) already claimed\n", + rtc->irq_alarm); + goto err; + } + + return 0; +err: + clk_disable_unprepare(rtc->ck_rtc); + + if (dbp) + regmap_update_bits(dbp, PWR_CR, PWR_CR_DBP, ~PWR_CR_DBP); + + device_init_wakeup(&pdev->dev, false); + + return ret; +} + +static int __exit stm32_rtc_remove(struct platform_device *pdev) +{ + struct stm32_rtc *rtc = platform_get_drvdata(pdev); + unsigned int cr; + + /* Disable interrupts */ + stm32_rtc_wpr_unlock(rtc); + cr = stm32_rtc_readl(rtc, STM32_RTC_CR); + cr &= ~STM32_RTC_CR_ALRAIE; + stm32_rtc_writel(rtc, STM32_RTC_CR, cr); + stm32_rtc_wpr_lock(rtc); + + clk_disable_unprepare(rtc->ck_rtc); + + /* Enable backup domain write protection */ + if (dbp) + regmap_update_bits(dbp, PWR_CR, PWR_CR_DBP, ~PWR_CR_DBP); + + device_init_wakeup(&pdev->dev, false); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int stm32_rtc_suspend(struct device *dev) +{ + struct stm32_rtc *rtc = dev_get_drvdata(dev); + + if (device_may_wakeup(dev)) + return enable_irq_wake(rtc->irq_alarm); + + return 0; +} + +static int stm32_rtc_resume(struct device *dev) +{ + struct stm32_rtc *rtc = dev_get_drvdata(dev); + int ret = 0; + + ret = stm32_rtc_wait_sync(rtc); + if (ret < 0) + return ret; + + if (device_may_wakeup(dev)) + return disable_irq_wake(rtc->irq_alarm); + + return ret; +} +#endif + +static SIMPLE_DEV_PM_OPS(stm32_rtc_pm_ops, + stm32_rtc_suspend, stm32_rtc_resume); + +static struct platform_driver stm32_rtc_driver = { + .probe = stm32_rtc_probe, + .remove = stm32_rtc_remove, + .driver = { + .name = DRIVER_NAME, + .pm = &stm32_rtc_pm_ops, + .of_match_table = stm32_rtc_of_match, + }, +}; + +module_platform_driver(stm32_rtc_driver); + +MODULE_ALIAS("platform:" DRIVER_NAME); +MODULE_AUTHOR("Amelie Delaunay <amelie.delaunay@xxxxxx>"); +MODULE_DESCRIPTION("STMicroelectronics STM32 Real Time Clock driver"); +MODULE_LICENSE("GPL v2"); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html