--- /dev/null
+What: /dev/rtcX
+Date: April 2005
+KernelVersion: 2.6.12
+Contact: linux-rtc@vger.kernel.org
+Description:
+ The ioctl interface to drivers for real-time clocks (RTCs).
+ Following actions are supported:
+
+ * RTC_RD_TIME, RTC_SET_TIME: Read or set the RTC time. Time
+ format is a Gregorian calendar date and 24 hour wall clock
+ time.
+
+ * RTC_AIE_ON, RTC_AIE_OFF: Enable or disable the alarm interrupt
+ for RTCs that support alarms
+
+ * RTC_ALM_READ, RTC_ALM_SET: Read or set the alarm time for
+ RTCs that support alarms. Can be set upto 24 hours in the
+ future. Requires a separate RTC_AIE_ON call to enable the
+ alarm interrupt. (Prefer to use RTC_WKALM_*)
+
+ * RTC_WKALM_RD, RTC_WKALM_SET: For RTCs that support a more
+ powerful interface, which can issue alarms beyond 24 hours and
+ enable IRQs in the same request.
+
+ * RTC_PIE_ON, RTC_PIE_OFF: Enable or disable the periodic
+ interrupt for RTCs that support periodic interrupts.
+
+ * RTC_UIE_ON, RTC_UIE_OFF: Enable or disable the update
+ interrupt for RTCs that support it.
+
+ * RTC_IRQP_READ, RTC_IRQP_SET: Read or set the frequency for
+ periodic interrupts for RTCs that support periodic interrupts.
+ Requires a separate RTC_PIE_ON call to enable the periodic
+ interrupts.
+
+ The ioctl() calls supported by the older /dev/rtc interface are
+ also supported by the newer RTC class framework. However,
+ because the chips and systems are not standardized, some PC/AT
+ functionality might not be provided. And in the same way, some
+ newer features -- including those enabled by ACPI -- are exposed
+ by the RTC class framework, but can't be supported by the older
+ driver.
--- /dev/null
+What: /sys/class/rtc/
+Date: March 2006
+KernelVersion: 2.6.17
+Contact: linux-rtc@vger.kernel.org
+Description:
+ The rtc/ class subdirectory belongs to the RTC subsystem.
+
+What: /sys/class/rtc/rtcX/
+Date: March 2006
+KernelVersion: 2.6.17
+Contact: linux-rtc@vger.kernel.org
+Description:
+ The /sys/class/rtc/rtc{0,1,2,3,...} directories correspond
+ to each RTC device.
+
+What: /sys/class/rtc/rtcX/date
+Date: March 2006
+KernelVersion: 2.6.17
+Contact: linux-rtc@vger.kernel.org
+Description:
+ (RO) RTC-provided date in YYYY-MM-DD format
+
+What: /sys/class/rtc/rtcX/hctosys
+Date: September 2009
+KernelVersion: 2.6.32
+Contact: linux-rtc@vger.kernel.org
+Description:
+ (RO) 1 if the RTC provided the system time at boot via the
+ CONFIG_RTC_HCTOSYS kernel option, 0 otherwise
+
+What: /sys/class/rtc/rtcX/max_user_freq
+Date: October 2007
+KernelVersion: 2.6.24
+Contact: linux-rtc@vger.kernel.org
+Description:
+ (RW) The maximum interrupt rate an unprivileged user may request
+ from this RTC.
+
+What: /sys/class/rtc/rtcX/name
+Date: March 2006
+KernelVersion: 2.6.17
+Contact: linux-rtc@vger.kernel.org
+Description:
+ (RO) The name of the RTC corresponding to this sysfs directory
+
+What: /sys/class/rtc/rtcX/since_epoch
+Date: March 2006
+KernelVersion: 2.6.17
+Contact: linux-rtc@vger.kernel.org
+Description:
+ (RO) RTC-provided time as the number of seconds since the epoch
+
+What: /sys/class/rtc/rtcX/time
+Date: March 2006
+KernelVersion: 2.6.17
+Contact: linux-rtc@vger.kernel.org
+Description:
+ (RO) RTC-provided time in 24-hour notation (hh:mm:ss)
+
+What: /sys/class/rtc/rtcX/*/nvmem
+Date: February 2016
+KernelVersion: 4.6
+Contact: linux-rtc@vger.kernel.org
+Description:
+ (RW) The non volatile storage exported as a raw file, as
+ described in Documentation/nvmem/nvmem.txt
+
+What: /sys/class/rtc/rtcX/offset
+Date: February 2016
+KernelVersion: 4.6
+Contact: linux-rtc@vger.kernel.org
+Description:
+ (RW) The amount which the rtc clock has been adjusted in
+ firmware. Visible only if the driver supports clock offset
+ adjustment. The unit is parts per billion, i.e. The number of
+ clock ticks which are added to or removed from the rtc's base
+ clock per billion ticks. A positive value makes a day pass more
+ slowly, longer, and a negative value makes a day pass more
+ quickly.
+
+What: /sys/class/rtc/rtcX/wakealarm
+Date: February 2007
+KernelVersion: 2.6.20
+Contact: linux-rtc@vger.kernel.org
+Description:
+ (RW) The time at which the clock will generate a system wakeup
+ event. This is a one shot wakeup event, so must be reset after
+ wake if a daily wakeup is required. Format is seconds since the
+ epoch by default, or if there's a leading +, seconds in the
+ future, or if there is a leading +=, seconds ahead of the
+ current alarm.
--- /dev/null
+* i.MX53 Secure Real Time Clock (SRTC)
+
+Required properties:
+- compatible: should be: "fsl,imx53-rtc"
+- reg: physical base address of the controller and length of memory mapped
+ region.
+- clocks: should contain the phandle for the rtc clock
+- interrupts: rtc alarm interrupt
+
+Example:
+
+rtc@53fa4000 {
+ compatible = "fsl,imx53-rtc";
+ reg = <0x53fa4000 0x4000>;
+ interrupts = <24>;
+ clocks = <&clks IMX5_CLK_SRTC_GATE>;
+};
the system clock from the discrete RTC, but use the integrated one for all
other tasks, because of its greater functionality.
-SYSFS interface
----------------
-
-The sysfs interface under /sys/class/rtc/rtcN provides access to various
-rtc attributes without requiring the use of ioctls. All dates and times
-are in the RTC's timezone, rather than in system time.
-
-================ ==============================================================
-date RTC-provided date
-hctosys 1 if the RTC provided the system time at boot via the
- CONFIG_RTC_HCTOSYS kernel option, 0 otherwise
-max_user_freq The maximum interrupt rate an unprivileged user may request
- from this RTC.
-name The name of the RTC corresponding to this sysfs directory
-since_epoch The number of seconds since the epoch according to the RTC
-time RTC-provided time
-wakealarm The time at which the clock will generate a system wakeup
- event. This is a one shot wakeup event, so must be reset
- after wake if a daily wakeup is required. Format is seconds
- since the epoch by default, or if there's a leading +, seconds
- in the future, or if there is a leading +=, seconds ahead of
- the current alarm.
-offset The amount which the rtc clock has been adjusted in firmware.
- Visible only if the driver supports clock offset adjustment.
- The unit is parts per billion, i.e. The number of clock ticks
- which are added to or removed from the rtc's base clock per
- billion ticks. A positive value makes a day pass more slowly,
- longer, and a negative value makes a day pass more quickly.
-*/nvmem The non volatile storage exported as a raw file, as described
- in Documentation/nvmem/nvmem.txt
-================ ==============================================================
-
-IOCTL interface
----------------
-
-The ioctl() calls supported by /dev/rtc are also supported by the RTC class
-framework. However, because the chips and systems are not standardized,
-some PC/AT functionality might not be provided. And in the same way, some
-newer features -- including those enabled by ACPI -- are exposed by the
-RTC class framework, but can't be supported by the older driver.
-
- * RTC_RD_TIME, RTC_SET_TIME ... every RTC supports at least reading
- time, returning the result as a Gregorian calendar date and 24 hour
- wall clock time. To be most useful, this time may also be updated.
-
- * RTC_AIE_ON, RTC_AIE_OFF, RTC_ALM_SET, RTC_ALM_READ ... when the RTC
- is connected to an IRQ line, it can often issue an alarm IRQ up to
- 24 hours in the future. (Use RTC_WKALM_* by preference.)
-
- * RTC_WKALM_SET, RTC_WKALM_RD ... RTCs that can issue alarms beyond
- the next 24 hours use a slightly more powerful API, which supports
- setting the longer alarm time and enabling its IRQ using a single
- request (using the same model as EFI firmware).
-
- * RTC_UIE_ON, RTC_UIE_OFF ... if the RTC offers IRQs, the RTC framework
- will emulate this mechanism.
-
- * RTC_PIE_ON, RTC_PIE_OFF, RTC_IRQP_SET, RTC_IRQP_READ ... these icotls
- are emulated via a kernel hrtimer.
-
-In many cases, the RTC alarm can be a system wake event, used to force
-Linux out of a low power sleep state (or hibernation) back to a fully
-operational state. For example, a system could enter a deep power saving
-state until it's time to execute some scheduled tasks.
-
-Note that many of these ioctls are handled by the common rtc-dev interface.
-Some common examples:
-
- * RTC_RD_TIME, RTC_SET_TIME: the read_time/set_time functions will be
- called with appropriate values.
-
- * RTC_ALM_SET, RTC_ALM_READ, RTC_WKALM_SET, RTC_WKALM_RD: gets or sets
- the alarm rtc_timer. May call the set_alarm driver function.
-
- * RTC_IRQP_SET, RTC_IRQP_READ: These are emulated by the generic code.
-
- * RTC_PIE_ON, RTC_PIE_OFF: These are also emulated by the generic code.
-
-If all else fails, check out the tools/testing/selftests/timers/rtctest.c test!
+Check out tools/testing/selftests/timers/rtctest.c for an example usage of the
+ioctl interface.
If you say yes here you get support for the RTC controller found on
Xilinx Zynq Ultrascale+ MPSoC.
+config RTC_DRV_CROS_EC
+ tristate "Chrome OS EC RTC driver"
+ depends on MFD_CROS_EC
+ help
+ If you say yes here you will get support for the
+ Chrome OS Embedded Controller's RTC.
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-cros-ec.
+
comment "on-CPU RTC drivers"
config RTC_DRV_ASM9260
To compile this driver as a module, choose M here: the
module will be called rtc-pl031.
-config RTC_DRV_AT32AP700X
- tristate "AT32AP700X series RTC"
- depends on PLATFORM_AT32AP || COMPILE_TEST
- help
- Driver for the internal RTC (Realtime Clock) on Atmel AVR32
- AT32AP700x family processors.
-
config RTC_DRV_AT91RM9200
tristate "AT91RM9200 or some AT91SAM9 RTC"
depends on ARCH_AT91 || COMPILE_TEST
This driver can also be built as a module, if so, the module
will be called "rtc-mxc".
+config RTC_DRV_MXC_V2
+ tristate "Freescale MXC Real Time Clock for i.MX53"
+ depends on ARCH_MXC
+ help
+ If you say yes here you get support for the Freescale MXC
+ SRTC module in i.MX53 processor.
+
+ This driver can also be built as a module, if so, the module
+ will be called "rtc-mxc_v2".
+
config RTC_DRV_SNVS
tristate "Freescale SNVS RTC support"
select REGMAP_MMIO
obj-$(CONFIG_RTC_DRV_ARMADA38X) += rtc-armada38x.o
obj-$(CONFIG_RTC_DRV_AS3722) += rtc-as3722.o
obj-$(CONFIG_RTC_DRV_ASM9260) += rtc-asm9260.o
-obj-$(CONFIG_RTC_DRV_AT32AP700X)+= rtc-at32ap700x.o
obj-$(CONFIG_RTC_DRV_AT91RM9200)+= rtc-at91rm9200.o
obj-$(CONFIG_RTC_DRV_AT91SAM9) += rtc-at91sam9.o
obj-$(CONFIG_RTC_DRV_AU1XXX) += rtc-au1xxx.o
obj-$(CONFIG_RTC_DRV_CMOS) += rtc-cmos.o
obj-$(CONFIG_RTC_DRV_COH901331) += rtc-coh901331.o
obj-$(CONFIG_RTC_DRV_CPCAP) += rtc-cpcap.o
+obj-$(CONFIG_RTC_DRV_CROS_EC) += rtc-cros-ec.o
obj-$(CONFIG_RTC_DRV_DA9052) += rtc-da9052.o
obj-$(CONFIG_RTC_DRV_DA9055) += rtc-da9055.o
obj-$(CONFIG_RTC_DRV_DA9063) += rtc-da9063.o
obj-$(CONFIG_RTC_DRV_MT7622) += rtc-mt7622.o
obj-$(CONFIG_RTC_DRV_MV) += rtc-mv.o
obj-$(CONFIG_RTC_DRV_MXC) += rtc-mxc.o
+obj-$(CONFIG_RTC_DRV_MXC_V2) += rtc-mxc_v2.o
obj-$(CONFIG_RTC_DRV_NUC900) += rtc-nuc900.o
obj-$(CONFIG_RTC_DRV_OMAP) += rtc-omap.o
obj-$(CONFIG_RTC_DRV_OPAL) += rtc-opal.o
return chip->irq;
}
+ chip->rtc = devm_rtc_allocate_device(&pdev->dev);
+ if (IS_ERR(chip->rtc))
+ return PTR_ERR(chip->rtc);
+
+ chip->rtc->ops = &ac100_rtc_ops;
+
ret = devm_request_threaded_irq(&pdev->dev, chip->irq, NULL,
ac100_rtc_irq,
IRQF_SHARED | IRQF_ONESHOT,
/* clear counter alarm pending interrupts */
regmap_write(chip->regmap, AC100_ALM_INT_STA, AC100_ALM_INT_ENABLE);
- chip->rtc = devm_rtc_device_register(&pdev->dev, "rtc-ac100",
- &ac100_rtc_ops, THIS_MODULE);
- if (IS_ERR(chip->rtc)) {
- dev_err(&pdev->dev, "unable to register device\n");
- return PTR_ERR(chip->rtc);
- }
-
ret = ac100_rtc_register_clks(chip);
if (ret)
return ret;
+ ret = rtc_register_device(chip->rtc);
+ if (ret) {
+ dev_err(&pdev->dev, "unable to register device\n");
+ return ret;
+ }
+
dev_info(&pdev->dev, "RTC enabled\n");
return 0;
+++ /dev/null
-/*
- * An RTC driver for the AVR32 AT32AP700x processor series.
- *
- * Copyright (C) 2007 Atmel Corporation
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published
- * by the Free Software Foundation.
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/rtc.h>
-#include <linux/io.h>
-
-/*
- * This is a bare-bones RTC. It runs during most system sleep states, but has
- * no battery backup and gets reset during system restart. It must be
- * initialized from an external clock (network, I2C, etc) before it can be of
- * much use.
- *
- * The alarm functionality is limited by the hardware, not supporting
- * periodic interrupts.
- */
-
-#define RTC_CTRL 0x00
-#define RTC_CTRL_EN 0
-#define RTC_CTRL_PCLR 1
-#define RTC_CTRL_TOPEN 2
-#define RTC_CTRL_PSEL 8
-
-#define RTC_VAL 0x04
-
-#define RTC_TOP 0x08
-
-#define RTC_IER 0x10
-#define RTC_IER_TOPI 0
-
-#define RTC_IDR 0x14
-#define RTC_IDR_TOPI 0
-
-#define RTC_IMR 0x18
-#define RTC_IMR_TOPI 0
-
-#define RTC_ISR 0x1c
-#define RTC_ISR_TOPI 0
-
-#define RTC_ICR 0x20
-#define RTC_ICR_TOPI 0
-
-#define RTC_BIT(name) (1 << RTC_##name)
-#define RTC_BF(name, value) ((value) << RTC_##name)
-
-#define rtc_readl(dev, reg) \
- __raw_readl((dev)->regs + RTC_##reg)
-#define rtc_writel(dev, reg, value) \
- __raw_writel((value), (dev)->regs + RTC_##reg)
-
-struct rtc_at32ap700x {
- struct rtc_device *rtc;
- void __iomem *regs;
- unsigned long alarm_time;
- unsigned long irq;
- /* Protect against concurrent register access. */
- spinlock_t lock;
-};
-
-static int at32_rtc_readtime(struct device *dev, struct rtc_time *tm)
-{
- struct rtc_at32ap700x *rtc = dev_get_drvdata(dev);
- unsigned long now;
-
- now = rtc_readl(rtc, VAL);
- rtc_time_to_tm(now, tm);
-
- return 0;
-}
-
-static int at32_rtc_settime(struct device *dev, struct rtc_time *tm)
-{
- struct rtc_at32ap700x *rtc = dev_get_drvdata(dev);
- unsigned long now;
- int ret;
-
- ret = rtc_tm_to_time(tm, &now);
- if (ret == 0)
- rtc_writel(rtc, VAL, now);
-
- return ret;
-}
-
-static int at32_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
-{
- struct rtc_at32ap700x *rtc = dev_get_drvdata(dev);
-
- spin_lock_irq(&rtc->lock);
- rtc_time_to_tm(rtc->alarm_time, &alrm->time);
- alrm->enabled = rtc_readl(rtc, IMR) & RTC_BIT(IMR_TOPI) ? 1 : 0;
- alrm->pending = rtc_readl(rtc, ISR) & RTC_BIT(ISR_TOPI) ? 1 : 0;
- spin_unlock_irq(&rtc->lock);
-
- return 0;
-}
-
-static int at32_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
-{
- struct rtc_at32ap700x *rtc = dev_get_drvdata(dev);
- unsigned long rtc_unix_time;
- unsigned long alarm_unix_time;
- int ret;
-
- rtc_unix_time = rtc_readl(rtc, VAL);
-
- ret = rtc_tm_to_time(&alrm->time, &alarm_unix_time);
- if (ret)
- return ret;
-
- if (alarm_unix_time < rtc_unix_time)
- return -EINVAL;
-
- spin_lock_irq(&rtc->lock);
- rtc->alarm_time = alarm_unix_time;
- rtc_writel(rtc, TOP, rtc->alarm_time);
- if (alrm->enabled)
- rtc_writel(rtc, CTRL, rtc_readl(rtc, CTRL)
- | RTC_BIT(CTRL_TOPEN));
- else
- rtc_writel(rtc, CTRL, rtc_readl(rtc, CTRL)
- & ~RTC_BIT(CTRL_TOPEN));
- spin_unlock_irq(&rtc->lock);
-
- return ret;
-}
-
-static int at32_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
-{
- struct rtc_at32ap700x *rtc = dev_get_drvdata(dev);
- int ret = 0;
-
- spin_lock_irq(&rtc->lock);
-
- if (enabled) {
- if (rtc_readl(rtc, VAL) > rtc->alarm_time) {
- ret = -EINVAL;
- goto out;
- }
- rtc_writel(rtc, CTRL, rtc_readl(rtc, CTRL)
- | RTC_BIT(CTRL_TOPEN));
- rtc_writel(rtc, ICR, RTC_BIT(ICR_TOPI));
- rtc_writel(rtc, IER, RTC_BIT(IER_TOPI));
- } else {
- rtc_writel(rtc, CTRL, rtc_readl(rtc, CTRL)
- & ~RTC_BIT(CTRL_TOPEN));
- rtc_writel(rtc, IDR, RTC_BIT(IDR_TOPI));
- rtc_writel(rtc, ICR, RTC_BIT(ICR_TOPI));
- }
-out:
- spin_unlock_irq(&rtc->lock);
-
- return ret;
-}
-
-static irqreturn_t at32_rtc_interrupt(int irq, void *dev_id)
-{
- struct rtc_at32ap700x *rtc = (struct rtc_at32ap700x *)dev_id;
- unsigned long isr = rtc_readl(rtc, ISR);
- unsigned long events = 0;
- int ret = IRQ_NONE;
-
- spin_lock(&rtc->lock);
-
- if (isr & RTC_BIT(ISR_TOPI)) {
- rtc_writel(rtc, ICR, RTC_BIT(ICR_TOPI));
- rtc_writel(rtc, IDR, RTC_BIT(IDR_TOPI));
- rtc_writel(rtc, CTRL, rtc_readl(rtc, CTRL)
- & ~RTC_BIT(CTRL_TOPEN));
- rtc_writel(rtc, VAL, rtc->alarm_time);
- events = RTC_AF | RTC_IRQF;
- rtc_update_irq(rtc->rtc, 1, events);
- ret = IRQ_HANDLED;
- }
-
- spin_unlock(&rtc->lock);
-
- return ret;
-}
-
-static const struct rtc_class_ops at32_rtc_ops = {
- .read_time = at32_rtc_readtime,
- .set_time = at32_rtc_settime,
- .read_alarm = at32_rtc_readalarm,
- .set_alarm = at32_rtc_setalarm,
- .alarm_irq_enable = at32_rtc_alarm_irq_enable,
-};
-
-static int __init at32_rtc_probe(struct platform_device *pdev)
-{
- struct resource *regs;
- struct rtc_at32ap700x *rtc;
- int irq;
- int ret;
-
- rtc = devm_kzalloc(&pdev->dev, sizeof(struct rtc_at32ap700x),
- GFP_KERNEL);
- if (!rtc)
- return -ENOMEM;
-
- regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!regs) {
- dev_dbg(&pdev->dev, "no mmio resource defined\n");
- return -ENXIO;
- }
-
- irq = platform_get_irq(pdev, 0);
- if (irq <= 0) {
- dev_dbg(&pdev->dev, "could not get irq\n");
- return -ENXIO;
- }
-
- rtc->irq = irq;
- rtc->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
- if (!rtc->regs) {
- dev_dbg(&pdev->dev, "could not map I/O memory\n");
- return -ENOMEM;
- }
- spin_lock_init(&rtc->lock);
-
- /*
- * Maybe init RTC: count from zero at 1 Hz, disable wrap irq.
- *
- * Do not reset VAL register, as it can hold an old time
- * from last JTAG reset.
- */
- if (!(rtc_readl(rtc, CTRL) & RTC_BIT(CTRL_EN))) {
- rtc_writel(rtc, CTRL, RTC_BIT(CTRL_PCLR));
- rtc_writel(rtc, IDR, RTC_BIT(IDR_TOPI));
- rtc_writel(rtc, CTRL, RTC_BF(CTRL_PSEL, 0xe)
- | RTC_BIT(CTRL_EN));
- }
-
- ret = devm_request_irq(&pdev->dev, irq, at32_rtc_interrupt, IRQF_SHARED,
- "rtc", rtc);
- if (ret) {
- dev_dbg(&pdev->dev, "could not request irq %d\n", irq);
- return ret;
- }
-
- platform_set_drvdata(pdev, rtc);
-
- rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
- &at32_rtc_ops, THIS_MODULE);
- if (IS_ERR(rtc->rtc)) {
- dev_dbg(&pdev->dev, "could not register rtc device\n");
- return PTR_ERR(rtc->rtc);
- }
-
- device_init_wakeup(&pdev->dev, 1);
-
- dev_info(&pdev->dev, "Atmel RTC for AT32AP700x at %08lx irq %ld\n",
- (unsigned long)rtc->regs, rtc->irq);
-
- return 0;
-}
-
-static int __exit at32_rtc_remove(struct platform_device *pdev)
-{
- device_init_wakeup(&pdev->dev, 0);
-
- return 0;
-}
-
-MODULE_ALIAS("platform:at32ap700x_rtc");
-
-static struct platform_driver at32_rtc_driver = {
- .remove = __exit_p(at32_rtc_remove),
- .driver = {
- .name = "at32ap700x_rtc",
- },
-};
-
-module_platform_driver_probe(at32_rtc_driver, at32_rtc_probe);
-
-MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
-MODULE_DESCRIPTION("Real time clock for AVR32 AT32AP700x");
-MODULE_LICENSE("GPL");
ret = devm_request_irq(dev, timer->irq, brcmstb_waketmr_irq, 0,
"brcmstb-waketimer", timer);
if (ret < 0)
- return ret;
+ goto err_clk;
timer->reboot_notifier.notifier_call = brcmstb_waketmr_reboot;
register_reboot_notifier(&timer->reboot_notifier);
&brcmstb_waketmr_ops, THIS_MODULE);
if (IS_ERR(timer->rtc)) {
dev_err(dev, "unable to register device\n");
- unregister_reboot_notifier(&timer->reboot_notifier);
- return PTR_ERR(timer->rtc);
+ ret = PTR_ERR(timer->rtc);
+ goto err_notifier;
}
dev_info(dev, "registered, with irq %d\n", timer->irq);
+ return 0;
+
+err_notifier:
+ unregister_reboot_notifier(&timer->reboot_notifier);
+
+err_clk:
+ if (timer->clk)
+ clk_disable_unprepare(timer->clk);
+
return ret;
}
--- /dev/null
+/*
+ * RTC driver for Chrome OS Embedded Controller
+ *
+ * Copyright (c) 2017, Google, Inc
+ *
+ * Author: Stephen Barber <smbarber@chromium.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/mfd/cros_ec.h>
+#include <linux/mfd/cros_ec_commands.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/slab.h>
+
+#define DRV_NAME "cros-ec-rtc"
+
+/**
+ * struct cros_ec_rtc - Driver data for EC RTC
+ *
+ * @cros_ec: Pointer to EC device
+ * @rtc: Pointer to RTC device
+ * @notifier: Notifier info for responding to EC events
+ * @saved_alarm: Alarm to restore when interrupts are reenabled
+ */
+struct cros_ec_rtc {
+ struct cros_ec_device *cros_ec;
+ struct rtc_device *rtc;
+ struct notifier_block notifier;
+ u32 saved_alarm;
+};
+
+static int cros_ec_rtc_get(struct cros_ec_device *cros_ec, u32 command,
+ u32 *response)
+{
+ int ret;
+ struct {
+ struct cros_ec_command msg;
+ struct ec_response_rtc data;
+ } __packed msg;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.msg.command = command;
+ msg.msg.insize = sizeof(msg.data);
+
+ ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
+ if (ret < 0) {
+ dev_err(cros_ec->dev,
+ "error getting %s from EC: %d\n",
+ command == EC_CMD_RTC_GET_VALUE ? "time" : "alarm",
+ ret);
+ return ret;
+ }
+
+ *response = msg.data.time;
+
+ return 0;
+}
+
+static int cros_ec_rtc_set(struct cros_ec_device *cros_ec, u32 command,
+ u32 param)
+{
+ int ret = 0;
+ struct {
+ struct cros_ec_command msg;
+ struct ec_response_rtc data;
+ } __packed msg;
+
+ memset(&msg, 0, sizeof(msg));
+ msg.msg.command = command;
+ msg.msg.outsize = sizeof(msg.data);
+ msg.data.time = param;
+
+ ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
+ if (ret < 0) {
+ dev_err(cros_ec->dev, "error setting %s on EC: %d\n",
+ command == EC_CMD_RTC_SET_VALUE ? "time" : "alarm",
+ ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/* Read the current time from the EC. */
+static int cros_ec_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
+ struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
+ int ret;
+ u32 time;
+
+ ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &time);
+ if (ret) {
+ dev_err(dev, "error getting time: %d\n", ret);
+ return ret;
+ }
+
+ rtc_time64_to_tm(time, tm);
+
+ return 0;
+}
+
+/* Set the current EC time. */
+static int cros_ec_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
+ struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
+ int ret;
+ time64_t time;
+
+ time = rtc_tm_to_time64(tm);
+ if (time < 0 || time > U32_MAX)
+ return -EINVAL;
+
+ ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_VALUE, (u32)time);
+ if (ret < 0) {
+ dev_err(dev, "error setting time: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/* Read alarm time from RTC. */
+static int cros_ec_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
+ struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
+ int ret;
+ u32 current_time, alarm_offset;
+
+ /*
+ * The EC host command for getting the alarm is relative (i.e. 5
+ * seconds from now) whereas rtc_wkalrm is absolute. Get the current
+ * RTC time first so we can calculate the relative time.
+ */
+ ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, ¤t_time);
+ if (ret < 0) {
+ dev_err(dev, "error getting time: %d\n", ret);
+ return ret;
+ }
+
+ ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_ALARM, &alarm_offset);
+ if (ret < 0) {
+ dev_err(dev, "error getting alarm: %d\n", ret);
+ return ret;
+ }
+
+ rtc_time64_to_tm(current_time + alarm_offset, &alrm->time);
+
+ return 0;
+}
+
+/* Set the EC's RTC alarm. */
+static int cros_ec_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
+ struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
+ int ret;
+ time64_t alarm_time;
+ u32 current_time, alarm_offset;
+
+ /*
+ * The EC host command for setting the alarm is relative
+ * (i.e. 5 seconds from now) whereas rtc_wkalrm is absolute.
+ * Get the current RTC time first so we can calculate the
+ * relative time.
+ */
+ ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, ¤t_time);
+ if (ret < 0) {
+ dev_err(dev, "error getting time: %d\n", ret);
+ return ret;
+ }
+
+ alarm_time = rtc_tm_to_time64(&alrm->time);
+
+ if (alarm_time < 0 || alarm_time > U32_MAX)
+ return -EINVAL;
+
+ if (!alrm->enabled) {
+ /*
+ * If the alarm is being disabled, send an alarm
+ * clear command.
+ */
+ alarm_offset = EC_RTC_ALARM_CLEAR;
+ cros_ec_rtc->saved_alarm = (u32)alarm_time;
+ } else {
+ /* Don't set an alarm in the past. */
+ if ((u32)alarm_time < current_time)
+ alarm_offset = EC_RTC_ALARM_CLEAR;
+ else
+ alarm_offset = (u32)alarm_time - current_time;
+ }
+
+ ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM, alarm_offset);
+ if (ret < 0) {
+ dev_err(dev, "error setting alarm: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int cros_ec_rtc_alarm_irq_enable(struct device *dev,
+ unsigned int enabled)
+{
+ struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
+ struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
+ int ret;
+ u32 current_time, alarm_offset, alarm_value;
+
+ ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, ¤t_time);
+ if (ret < 0) {
+ dev_err(dev, "error getting time: %d\n", ret);
+ return ret;
+ }
+
+ if (enabled) {
+ /* Restore saved alarm if it's still in the future. */
+ if (cros_ec_rtc->saved_alarm < current_time)
+ alarm_offset = EC_RTC_ALARM_CLEAR;
+ else
+ alarm_offset = cros_ec_rtc->saved_alarm - current_time;
+
+ ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM,
+ alarm_offset);
+ if (ret < 0) {
+ dev_err(dev, "error restoring alarm: %d\n", ret);
+ return ret;
+ }
+ } else {
+ /* Disable alarm, saving the old alarm value. */
+ ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_ALARM,
+ &alarm_offset);
+ if (ret < 0) {
+ dev_err(dev, "error saving alarm: %d\n", ret);
+ return ret;
+ }
+
+ alarm_value = current_time + alarm_offset;
+
+ /*
+ * If the current EC alarm is already past, we don't want
+ * to set an alarm when we go through the alarm irq enable
+ * path.
+ */
+ if (alarm_value < current_time)
+ cros_ec_rtc->saved_alarm = EC_RTC_ALARM_CLEAR;
+ else
+ cros_ec_rtc->saved_alarm = alarm_value;
+
+ alarm_offset = EC_RTC_ALARM_CLEAR;
+ ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM,
+ alarm_offset);
+ if (ret < 0) {
+ dev_err(dev, "error disabling alarm: %d\n", ret);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int cros_ec_rtc_event(struct notifier_block *nb,
+ unsigned long queued_during_suspend,
+ void *_notify)
+{
+ struct cros_ec_rtc *cros_ec_rtc;
+ struct rtc_device *rtc;
+ struct cros_ec_device *cros_ec;
+ u32 host_event;
+
+ cros_ec_rtc = container_of(nb, struct cros_ec_rtc, notifier);
+ rtc = cros_ec_rtc->rtc;
+ cros_ec = cros_ec_rtc->cros_ec;
+
+ host_event = cros_ec_get_host_event(cros_ec);
+ if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_RTC)) {
+ rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
+ return NOTIFY_OK;
+ } else {
+ return NOTIFY_DONE;
+ }
+}
+
+static const struct rtc_class_ops cros_ec_rtc_ops = {
+ .read_time = cros_ec_rtc_read_time,
+ .set_time = cros_ec_rtc_set_time,
+ .read_alarm = cros_ec_rtc_read_alarm,
+ .set_alarm = cros_ec_rtc_set_alarm,
+ .alarm_irq_enable = cros_ec_rtc_alarm_irq_enable,
+};
+
+#ifdef CONFIG_PM_SLEEP
+static int cros_ec_rtc_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(&pdev->dev);
+
+ if (device_may_wakeup(dev))
+ enable_irq_wake(cros_ec_rtc->cros_ec->irq);
+
+ return 0;
+}
+
+static int cros_ec_rtc_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(&pdev->dev);
+
+ if (device_may_wakeup(dev))
+ disable_irq_wake(cros_ec_rtc->cros_ec->irq);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(cros_ec_rtc_pm_ops, cros_ec_rtc_suspend,
+ cros_ec_rtc_resume);
+
+static int cros_ec_rtc_probe(struct platform_device *pdev)
+{
+ struct cros_ec_dev *ec_dev = dev_get_drvdata(pdev->dev.parent);
+ struct cros_ec_device *cros_ec = ec_dev->ec_dev;
+ struct cros_ec_rtc *cros_ec_rtc;
+ struct rtc_time tm;
+ int ret;
+
+ cros_ec_rtc = devm_kzalloc(&pdev->dev, sizeof(*cros_ec_rtc),
+ GFP_KERNEL);
+ if (!cros_ec_rtc)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, cros_ec_rtc);
+ cros_ec_rtc->cros_ec = cros_ec;
+
+ /* Get initial time */
+ ret = cros_ec_rtc_read_time(&pdev->dev, &tm);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to read RTC time\n");
+ return ret;
+ }
+
+ ret = device_init_wakeup(&pdev->dev, 1);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to initialize wakeup\n");
+ return ret;
+ }
+
+ cros_ec_rtc->rtc = devm_rtc_device_register(&pdev->dev, DRV_NAME,
+ &cros_ec_rtc_ops,
+ THIS_MODULE);
+ if (IS_ERR(cros_ec_rtc->rtc)) {
+ ret = PTR_ERR(cros_ec_rtc->rtc);
+ dev_err(&pdev->dev, "failed to register rtc device\n");
+ return ret;
+ }
+
+ /* Get RTC events from the EC. */
+ cros_ec_rtc->notifier.notifier_call = cros_ec_rtc_event;
+ ret = blocking_notifier_chain_register(&cros_ec->event_notifier,
+ &cros_ec_rtc->notifier);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register notifier\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int cros_ec_rtc_remove(struct platform_device *pdev)
+{
+ struct cros_ec_rtc *cros_ec_rtc = platform_get_drvdata(pdev);
+ struct device *dev = &pdev->dev;
+ int ret;
+
+ ret = blocking_notifier_chain_unregister(
+ &cros_ec_rtc->cros_ec->event_notifier,
+ &cros_ec_rtc->notifier);
+ if (ret) {
+ dev_err(dev, "failed to unregister notifier\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static struct platform_driver cros_ec_rtc_driver = {
+ .probe = cros_ec_rtc_probe,
+ .remove = cros_ec_rtc_remove,
+ .driver = {
+ .name = DRV_NAME,
+ .pm = &cros_ec_rtc_pm_ops,
+ },
+};
+
+module_platform_driver(cros_ec_rtc_driver);
+
+MODULE_DESCRIPTION("RTC driver for Chrome OS ECs");
+MODULE_AUTHOR("Stephen Barber <smbarber@chromium.org>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Real Time Clock (RTC) Driver for i.MX53
+ * Copyright (c) 2004-2011 Freescale Semiconductor, Inc.
+ * Copyright (c) 2017 Beckhoff Automation GmbH & Co. KG
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+
+#define SRTC_LPPDR_INIT 0x41736166 /* init for glitch detect */
+
+#define SRTC_LPCR_EN_LP BIT(3) /* lp enable */
+#define SRTC_LPCR_WAE BIT(4) /* lp wakeup alarm enable */
+#define SRTC_LPCR_ALP BIT(7) /* lp alarm flag */
+#define SRTC_LPCR_NSA BIT(11) /* lp non secure access */
+#define SRTC_LPCR_NVE BIT(14) /* lp non valid state exit bit */
+#define SRTC_LPCR_IE BIT(15) /* lp init state exit bit */
+
+#define SRTC_LPSR_ALP BIT(3) /* lp alarm flag */
+#define SRTC_LPSR_NVES BIT(14) /* lp non-valid state exit status */
+#define SRTC_LPSR_IES BIT(15) /* lp init state exit status */
+
+#define SRTC_LPSCMR 0x00 /* LP Secure Counter MSB Reg */
+#define SRTC_LPSCLR 0x04 /* LP Secure Counter LSB Reg */
+#define SRTC_LPSAR 0x08 /* LP Secure Alarm Reg */
+#define SRTC_LPCR 0x10 /* LP Control Reg */
+#define SRTC_LPSR 0x14 /* LP Status Reg */
+#define SRTC_LPPDR 0x18 /* LP Power Supply Glitch Detector Reg */
+
+/* max. number of retries to read registers, 120 was max during test */
+#define REG_READ_TIMEOUT 2000
+
+struct mxc_rtc_data {
+ struct rtc_device *rtc;
+ void __iomem *ioaddr;
+ struct clk *clk;
+ spinlock_t lock; /* protects register access */
+ int irq;
+};
+
+/*
+ * This function does write synchronization for writes to the lp srtc block.
+ * To take care of the asynchronous CKIL clock, all writes from the IP domain
+ * will be synchronized to the CKIL domain.
+ * The caller should hold the pdata->lock
+ */
+static void mxc_rtc_sync_lp_locked(struct device *dev, void __iomem *ioaddr)
+{
+ unsigned int i;
+
+ /* Wait for 3 CKIL cycles */
+ for (i = 0; i < 3; i++) {
+ const u32 count = readl(ioaddr + SRTC_LPSCLR);
+ unsigned int timeout = REG_READ_TIMEOUT;
+
+ while ((readl(ioaddr + SRTC_LPSCLR)) == count) {
+ if (!--timeout) {
+ dev_err_once(dev, "SRTC_LPSCLR stuck! Check your hw.\n");
+ return;
+ }
+ }
+ }
+}
+
+/* This function is the RTC interrupt service routine. */
+static irqreturn_t mxc_rtc_interrupt(int irq, void *dev_id)
+{
+ struct device *dev = dev_id;
+ struct mxc_rtc_data *pdata = dev_get_drvdata(dev);
+ void __iomem *ioaddr = pdata->ioaddr;
+ unsigned long flags;
+ u32 lp_status;
+ u32 lp_cr;
+
+ spin_lock_irqsave(&pdata->lock, flags);
+ if (clk_enable(pdata->clk)) {
+ spin_unlock_irqrestore(&pdata->lock, flags);
+ return IRQ_NONE;
+ }
+
+ lp_status = readl(ioaddr + SRTC_LPSR);
+ lp_cr = readl(ioaddr + SRTC_LPCR);
+
+ /* update irq data & counter */
+ if (lp_status & SRTC_LPSR_ALP) {
+ if (lp_cr & SRTC_LPCR_ALP)
+ rtc_update_irq(pdata->rtc, 1, RTC_AF | RTC_IRQF);
+
+ /* disable further lp alarm interrupts */
+ lp_cr &= ~(SRTC_LPCR_ALP | SRTC_LPCR_WAE);
+ }
+
+ /* Update interrupt enables */
+ writel(lp_cr, ioaddr + SRTC_LPCR);
+
+ /* clear interrupt status */
+ writel(lp_status, ioaddr + SRTC_LPSR);
+
+ mxc_rtc_sync_lp_locked(dev, ioaddr);
+ clk_disable(pdata->clk);
+ spin_unlock_irqrestore(&pdata->lock, flags);
+ return IRQ_HANDLED;
+}
+
+/*
+ * Enable clk and aquire spinlock
+ * @return 0 if successful; non-zero otherwise.
+ */
+static int mxc_rtc_lock(struct mxc_rtc_data *const pdata)
+{
+ int ret;
+
+ spin_lock_irq(&pdata->lock);
+ ret = clk_enable(pdata->clk);
+ if (ret) {
+ spin_unlock_irq(&pdata->lock);
+ return ret;
+ }
+ return 0;
+}
+
+static int mxc_rtc_unlock(struct mxc_rtc_data *const pdata)
+{
+ clk_disable(pdata->clk);
+ spin_unlock_irq(&pdata->lock);
+ return 0;
+}
+
+/*
+ * This function reads the current RTC time into tm in Gregorian date.
+ *
+ * @param tm contains the RTC time value upon return
+ *
+ * @return 0 if successful; non-zero otherwise.
+ */
+static int mxc_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ struct mxc_rtc_data *pdata = dev_get_drvdata(dev);
+ const int clk_failed = clk_enable(pdata->clk);
+
+ if (!clk_failed) {
+ const time64_t now = readl(pdata->ioaddr + SRTC_LPSCMR);
+
+ rtc_time64_to_tm(now, tm);
+ clk_disable(pdata->clk);
+ return 0;
+ }
+ return clk_failed;
+}
+
+/*
+ * This function sets the internal RTC time based on tm in Gregorian date.
+ *
+ * @param tm the time value to be set in the RTC
+ *
+ * @return 0 if successful; non-zero otherwise.
+ */
+static int mxc_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ struct mxc_rtc_data *pdata = dev_get_drvdata(dev);
+ time64_t time = rtc_tm_to_time64(tm);
+ int ret;
+
+ if (time > U32_MAX) {
+ dev_err(dev, "RTC exceeded by %llus\n", time - U32_MAX);
+ return -EINVAL;
+ }
+
+ ret = mxc_rtc_lock(pdata);
+ if (ret)
+ return ret;
+
+ writel(time, pdata->ioaddr + SRTC_LPSCMR);
+ mxc_rtc_sync_lp_locked(dev, pdata->ioaddr);
+ return mxc_rtc_unlock(pdata);
+}
+
+/*
+ * This function reads the current alarm value into the passed in \b alrm
+ * argument. It updates the \b alrm's pending field value based on the whether
+ * an alarm interrupt occurs or not.
+ *
+ * @param alrm contains the RTC alarm value upon return
+ *
+ * @return 0 if successful; non-zero otherwise.
+ */
+static int mxc_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct mxc_rtc_data *pdata = dev_get_drvdata(dev);
+ void __iomem *ioaddr = pdata->ioaddr;
+ int ret;
+
+ ret = mxc_rtc_lock(pdata);
+ if (ret)
+ return ret;
+
+ rtc_time_to_tm(readl(ioaddr + SRTC_LPSAR), &alrm->time);
+ alrm->pending = !!(readl(ioaddr + SRTC_LPSR) & SRTC_LPSR_ALP);
+ return mxc_rtc_unlock(pdata);
+}
+
+/*
+ * Enable/Disable alarm interrupt
+ * The caller should hold the pdata->lock
+ */
+static void mxc_rtc_alarm_irq_enable_locked(struct mxc_rtc_data *pdata,
+ unsigned int enable)
+{
+ u32 lp_cr = readl(pdata->ioaddr + SRTC_LPCR);
+
+ if (enable)
+ lp_cr |= (SRTC_LPCR_ALP | SRTC_LPCR_WAE);
+ else
+ lp_cr &= ~(SRTC_LPCR_ALP | SRTC_LPCR_WAE);
+
+ writel(lp_cr, pdata->ioaddr + SRTC_LPCR);
+}
+
+static int mxc_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
+{
+ struct mxc_rtc_data *pdata = dev_get_drvdata(dev);
+ int ret = mxc_rtc_lock(pdata);
+
+ if (ret)
+ return ret;
+
+ mxc_rtc_alarm_irq_enable_locked(pdata, enable);
+ return mxc_rtc_unlock(pdata);
+}
+
+/*
+ * This function sets the RTC alarm based on passed in alrm.
+ *
+ * @param alrm the alarm value to be set in the RTC
+ *
+ * @return 0 if successful; non-zero otherwise.
+ */
+static int mxc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ const time64_t time = rtc_tm_to_time64(&alrm->time);
+ struct mxc_rtc_data *pdata = dev_get_drvdata(dev);
+ int ret = mxc_rtc_lock(pdata);
+
+ if (ret)
+ return ret;
+
+ if (time > U32_MAX) {
+ dev_err(dev, "Hopefully I am out of service by then :-(\n");
+ return -EINVAL;
+ }
+
+ writel((u32)time, pdata->ioaddr + SRTC_LPSAR);
+
+ /* clear alarm interrupt status bit */
+ writel(SRTC_LPSR_ALP, pdata->ioaddr + SRTC_LPSR);
+ mxc_rtc_sync_lp_locked(dev, pdata->ioaddr);
+
+ mxc_rtc_alarm_irq_enable_locked(pdata, alrm->enabled);
+ mxc_rtc_sync_lp_locked(dev, pdata->ioaddr);
+ mxc_rtc_unlock(pdata);
+ return ret;
+}
+
+static const struct rtc_class_ops mxc_rtc_ops = {
+ .read_time = mxc_rtc_read_time,
+ .set_time = mxc_rtc_set_time,
+ .read_alarm = mxc_rtc_read_alarm,
+ .set_alarm = mxc_rtc_set_alarm,
+ .alarm_irq_enable = mxc_rtc_alarm_irq_enable,
+};
+
+static int mxc_rtc_wait_for_flag(void *__iomem ioaddr, int flag)
+{
+ unsigned int timeout = REG_READ_TIMEOUT;
+
+ while (!(readl(ioaddr) & flag)) {
+ if (!--timeout)
+ return -EBUSY;
+ }
+ return 0;
+}
+
+static int mxc_rtc_probe(struct platform_device *pdev)
+{
+ struct mxc_rtc_data *pdata;
+ struct resource *res;
+ void __iomem *ioaddr;
+ int ret = 0;
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(pdata->ioaddr))
+ return PTR_ERR(pdata->ioaddr);
+
+ ioaddr = pdata->ioaddr;
+
+ pdata->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(pdata->clk)) {
+ dev_err(&pdev->dev, "unable to get rtc clock!\n");
+ return PTR_ERR(pdata->clk);
+ }
+
+ spin_lock_init(&pdata->lock);
+ pdata->irq = platform_get_irq(pdev, 0);
+ if (pdata->irq < 0)
+ return pdata->irq;
+
+ device_init_wakeup(&pdev->dev, 1);
+
+ ret = clk_prepare_enable(pdata->clk);
+ if (ret)
+ return ret;
+ /* initialize glitch detect */
+ writel(SRTC_LPPDR_INIT, ioaddr + SRTC_LPPDR);
+
+ /* clear lp interrupt status */
+ writel(0xFFFFFFFF, ioaddr + SRTC_LPSR);
+
+ /* move out of init state */
+ writel((SRTC_LPCR_IE | SRTC_LPCR_NSA), ioaddr + SRTC_LPCR);
+ ret = mxc_rtc_wait_for_flag(ioaddr + SRTC_LPSR, SRTC_LPSR_IES);
+ if (ret) {
+ dev_err(&pdev->dev, "Timeout waiting for SRTC_LPSR_IES\n");
+ clk_disable_unprepare(pdata->clk);
+ return ret;
+ }
+
+ /* move out of non-valid state */
+ writel((SRTC_LPCR_IE | SRTC_LPCR_NVE | SRTC_LPCR_NSA |
+ SRTC_LPCR_EN_LP), ioaddr + SRTC_LPCR);
+ ret = mxc_rtc_wait_for_flag(ioaddr + SRTC_LPSR, SRTC_LPSR_NVES);
+ if (ret) {
+ dev_err(&pdev->dev, "Timeout waiting for SRTC_LPSR_NVES\n");
+ clk_disable_unprepare(pdata->clk);
+ return ret;
+ }
+
+ clk_disable(pdata->clk);
+ platform_set_drvdata(pdev, pdata);
+ ret =
+ devm_request_irq(&pdev->dev, pdata->irq, mxc_rtc_interrupt, 0,
+ pdev->name, &pdev->dev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "interrupt not available.\n");
+ clk_unprepare(pdata->clk);
+ return ret;
+ }
+
+ pdata->rtc =
+ devm_rtc_device_register(&pdev->dev, pdev->name, &mxc_rtc_ops,
+ THIS_MODULE);
+ if (IS_ERR(pdata->rtc)) {
+ clk_unprepare(pdata->clk);
+ return PTR_ERR(pdata->rtc);
+ }
+
+ return 0;
+}
+
+static int mxc_rtc_remove(struct platform_device *pdev)
+{
+ struct mxc_rtc_data *pdata = platform_get_drvdata(pdev);
+
+ clk_disable_unprepare(pdata->clk);
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int mxc_rtc_suspend(struct device *dev)
+{
+ struct mxc_rtc_data *pdata = dev_get_drvdata(dev);
+
+ if (device_may_wakeup(dev))
+ enable_irq_wake(pdata->irq);
+
+ return 0;
+}
+
+static int mxc_rtc_resume(struct device *dev)
+{
+ struct mxc_rtc_data *pdata = dev_get_drvdata(dev);
+
+ if (device_may_wakeup(dev))
+ disable_irq_wake(pdata->irq);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(mxc_rtc_pm_ops, mxc_rtc_suspend, mxc_rtc_resume);
+
+static const struct of_device_id mxc_ids[] = {
+ { .compatible = "fsl,imx53-rtc", },
+ {}
+};
+
+static struct platform_driver mxc_rtc_driver = {
+ .driver = {
+ .name = "mxc_rtc_v2",
+ .of_match_table = mxc_ids,
+ .pm = &mxc_rtc_pm_ops,
+ },
+ .probe = mxc_rtc_probe,
+ .remove = mxc_rtc_remove,
+};
+
+module_platform_driver(mxc_rtc_driver);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("Real Time Clock (RTC) Driver for i.MX53");
+MODULE_LICENSE("GPL");
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
rtc->base = devm_ioremap_resource(&pdev->dev, res);
- if (IS_ERR(rtc->base))
+ if (IS_ERR(rtc->base)) {
+ clk_disable_unprepare(rtc->clk);
return PTR_ERR(rtc->base);
+ }
platform_set_drvdata(pdev, rtc);
return 0;
err:
+ clk_disable_unprepare(rtc->clk);
device_init_wakeup(&pdev->dev, false);
rtc->type->lock(rtc);
pm_runtime_put_sync(&pdev->dev);
if (!(val & RTC7301_CONTROL_BUSY))
return 0;
- usleep_range(200, 300);
+ udelay(300);
}
return -ETIMEDOUT;
spin_lock_irqsave(&priv->lock, flags);
rtc7301_stop(priv);
- usleep_range(200, 300);
+ udelay(300);
rtc7301_select_bank(priv, 0);
rtc7301_write_time(priv, tm, false);
rtc7301_start(priv);
return 0;
}
-static int r9701_remove(struct spi_device *spi)
-{
- return 0;
-}
-
static struct spi_driver r9701_driver = {
.driver = {
.name = "rtc-r9701",
},
.probe = r9701_probe,
- .remove = r9701_remove,
};
module_spi_driver(r9701_driver);
/*
- * Copyright (C) Amelie Delaunay 2016
- * Author: Amelie Delaunay <amelie.delaunay@st.com>
+ * Copyright (C) STMicroelectronics SA 2017
+ * Author: Amelie Delaunay <amelie.delaunay@st.com> for STMicroelectronics.
* License terms: GNU General Public License (GPL), version 2
*/
clk_data = kzalloc(sizeof(*clk_data) + (sizeof(*clk_data->hws) * 2),
GFP_KERNEL);
- if (!clk_data)
+ if (!clk_data) {
+ kfree(rtc);
return;
+ }
spin_lock_init(&rtc->lock);
/* EC desires to change state of host-controlled USB mux */
EC_HOST_EVENT_USB_MUX = 28,
+ /* EC RTC event occurred */
+ EC_HOST_EVENT_RTC = 26,
+
/*
* The high bit of the event mask is not used as a host event code. If
* it reads back as set, then the entire event mask should be
EC_FEATURE_USB_MUX = 23,
/* Motion Sensor code has an internal software FIFO */
EC_FEATURE_MOTION_SENSE_FIFO = 24,
+ /* EC has RTC feature that can be controlled by host commands */
+ EC_FEATURE_RTC = 27,
};
#define EC_FEATURE_MASK_0(event_code) (1UL << (event_code % 32))
#define EC_CMD_RTC_SET_VALUE 0x46
#define EC_CMD_RTC_SET_ALARM 0x47
+/* Pass as param to SET_ALARM to clear the current alarm */
+#define EC_RTC_ALARM_CLEAR 0
+
/*****************************************************************************/
/* Port80 log access */
int (*set_offset)(struct device *, long offset);
};
-#define RTC_DEVICE_NAME_SIZE 20
typedef struct rtc_task {
void (*func)(void *private_data);
void *private_data;
projects / linux-2.6-microblaze.git / commitdiff