On 08/07/2016 at 22:33:38 +0800, Chen-Yu Tsai wrote : > X-Powers AC100 is a codec / RTC combo chip. This driver supports > the RTC sub-device. > > The RTC block also has clock outputs and non-volatile storage. > Non-volatile storage wthin the RTC hardware is not supported. > Clock output support is added in the next patch. > > Signed-off-by: Chen-Yu Tsai <wens@xxxxxxxx> Acked-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx> > --- > Changes since v4: > > - None. > > Changes since v3: > > - Moved month/year conversion offsets inline with reg[] assignments > - Used platform_get_irq instead of of_get_irq > - Dropped separate mutex and use rtc->ops_lock in interrupt handler > - Dropped of_irq.h from includes > - Added of_device_id and .of_match_table > > Changes since v2: > > - Fixed off-by-1 errors in register mask macros > - Fixed copy-paste error in set_alarm function > - Drop uie_unsupported, since the alarm works now > - Fixed up copyright notice > - Changed license to GPL v2, matching mfd driver > > --- > drivers/rtc/Kconfig | 10 ++ > drivers/rtc/Makefile | 1 + > drivers/rtc/rtc-ac100.c | 325 ++++++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 336 insertions(+) > create mode 100644 drivers/rtc/rtc-ac100.c > > diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig > index 18639e0cb6e2..b9d7cbb6bd76 100644 > --- a/drivers/rtc/Kconfig > +++ b/drivers/rtc/Kconfig > @@ -183,6 +183,16 @@ config RTC_DRV_ABX80X > This driver can also be built as a module. If so, the module > will be called rtc-abx80x. > > +config RTC_DRV_AC100 > + tristate "X-Powers AC100" > + depends on MFD_AC100 > + help > + If you say yes here you get support for the real-time clock found > + in X-Powers AC100 family peripheral ICs. > + > + This driver can also be built as a module. If so, the module > + will be called rtc-ac100. > + > config RTC_DRV_AS3722 > tristate "ams AS3722 RTC driver" > depends on MFD_AS3722 > diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile > index ea2833723fa9..b07c28779573 100644 > --- a/drivers/rtc/Makefile > +++ b/drivers/rtc/Makefile > @@ -26,6 +26,7 @@ obj-$(CONFIG_RTC_DRV_AB3100) += rtc-ab3100.o > obj-$(CONFIG_RTC_DRV_AB8500) += rtc-ab8500.o > obj-$(CONFIG_RTC_DRV_ABB5ZES3) += rtc-ab-b5ze-s3.o > obj-$(CONFIG_RTC_DRV_ABX80X) += rtc-abx80x.o > +obj-$(CONFIG_RTC_DRV_AC100) += rtc-ac100.o > obj-$(CONFIG_RTC_DRV_ARMADA38X) += rtc-armada38x.o > obj-$(CONFIG_RTC_DRV_AS3722) += rtc-as3722.o > obj-$(CONFIG_RTC_DRV_ASM9260) += rtc-asm9260.o > diff --git a/drivers/rtc/rtc-ac100.c b/drivers/rtc/rtc-ac100.c > new file mode 100644 > index 000000000000..5a9ca89d04c7 > --- /dev/null > +++ b/drivers/rtc/rtc-ac100.c > @@ -0,0 +1,325 @@ > +/* > + * RTC Driver for X-Powers AC100 > + * > + * Copyright (c) 2016 Chen-Yu Tsai > + * > + * Chen-Yu Tsai <wens@xxxxxxxx> > + * > + * 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. > + * > + * This program is distributed in the hope that 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/bcd.h> > +#include <linux/device.h> > +#include <linux/interrupt.h> > +#include <linux/kernel.h> > +#include <linux/mfd/ac100.h> > +#include <linux/module.h> > +#include <linux/mutex.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/regmap.h> > +#include <linux/rtc.h> > +#include <linux/types.h> > + > +/* Control register */ > +#define AC100_RTC_CTRL_24HOUR BIT(0) > + > +/* RTC */ > +#define AC100_RTC_SEC_MASK GENMASK(6, 0) > +#define AC100_RTC_MIN_MASK GENMASK(6, 0) > +#define AC100_RTC_HOU_MASK GENMASK(5, 0) > +#define AC100_RTC_WEE_MASK GENMASK(2, 0) > +#define AC100_RTC_DAY_MASK GENMASK(5, 0) > +#define AC100_RTC_MON_MASK GENMASK(4, 0) > +#define AC100_RTC_YEA_MASK GENMASK(7, 0) > +#define AC100_RTC_YEA_LEAP BIT(15) > +#define AC100_RTC_UPD_TRIGGER BIT(15) > + > +/* Alarm (wall clock) */ > +#define AC100_ALM_INT_ENABLE BIT(0) > + > +#define AC100_ALM_SEC_MASK GENMASK(6, 0) > +#define AC100_ALM_MIN_MASK GENMASK(6, 0) > +#define AC100_ALM_HOU_MASK GENMASK(5, 0) > +#define AC100_ALM_WEE_MASK GENMASK(2, 0) > +#define AC100_ALM_DAY_MASK GENMASK(5, 0) > +#define AC100_ALM_MON_MASK GENMASK(4, 0) > +#define AC100_ALM_YEA_MASK GENMASK(7, 0) > +#define AC100_ALM_ENABLE_FLAG BIT(15) > +#define AC100_ALM_UPD_TRIGGER BIT(15) > + > +/* > + * The year parameter passed to the driver is usually an offset relative to > + * the year 1900. This macro is used to convert this offset to another one > + * relative to the minimum year allowed by the hardware. > + * > + * The year range is 1970 - 2069. This range is selected to match Allwinner's > + * driver. > + */ > +#define AC100_YEAR_MIN 1970 > +#define AC100_YEAR_MAX 2069 > +#define AC100_YEAR_OFF (AC100_YEAR_MIN - 1900) > + > +struct ac100_rtc_dev { > + struct rtc_device *rtc; > + struct device *dev; > + struct regmap *regmap; > + int irq; > + unsigned long alarm; > +}; > + > +static int ac100_rtc_get_time(struct device *dev, struct rtc_time *rtc_tm) > +{ > + struct ac100_rtc_dev *chip = dev_get_drvdata(dev); > + struct regmap *regmap = chip->regmap; > + u16 reg[7]; > + int ret; > + > + ret = regmap_bulk_read(regmap, AC100_RTC_SEC, reg, 7); > + if (ret) > + return ret; > + > + rtc_tm->tm_sec = bcd2bin(reg[0] & AC100_RTC_SEC_MASK); > + rtc_tm->tm_min = bcd2bin(reg[1] & AC100_RTC_MIN_MASK); > + rtc_tm->tm_hour = bcd2bin(reg[2] & AC100_RTC_HOU_MASK); > + rtc_tm->tm_wday = bcd2bin(reg[3] & AC100_RTC_WEE_MASK); > + rtc_tm->tm_mday = bcd2bin(reg[4] & AC100_RTC_DAY_MASK); > + rtc_tm->tm_mon = bcd2bin(reg[5] & AC100_RTC_MON_MASK) - 1; > + rtc_tm->tm_year = bcd2bin(reg[6] & AC100_RTC_YEA_MASK) + > + AC100_YEAR_OFF; > + > + return rtc_valid_tm(rtc_tm); > +} > + > +static int ac100_rtc_set_time(struct device *dev, struct rtc_time *rtc_tm) > +{ > + struct ac100_rtc_dev *chip = dev_get_drvdata(dev); > + struct regmap *regmap = chip->regmap; > + int year; > + u16 reg[8]; > + > + /* our RTC has a limited year range... */ > + year = rtc_tm->tm_year - AC100_YEAR_OFF; > + if (year < 0 || year > (AC100_YEAR_MAX - 1900)) { > + dev_err(dev, "rtc only supports year in range %d - %d\n", > + AC100_YEAR_MIN, AC100_YEAR_MAX); > + return -EINVAL; > + } > + > + /* convert to BCD */ > + reg[0] = bin2bcd(rtc_tm->tm_sec) & AC100_RTC_SEC_MASK; > + reg[1] = bin2bcd(rtc_tm->tm_min) & AC100_RTC_MIN_MASK; > + reg[2] = bin2bcd(rtc_tm->tm_hour) & AC100_RTC_HOU_MASK; > + reg[3] = bin2bcd(rtc_tm->tm_wday) & AC100_RTC_WEE_MASK; > + reg[4] = bin2bcd(rtc_tm->tm_mday) & AC100_RTC_DAY_MASK; > + reg[5] = bin2bcd(rtc_tm->tm_mon + 1) & AC100_RTC_MON_MASK; > + reg[6] = bin2bcd(year) & AC100_RTC_YEA_MASK; > + /* trigger write */ > + reg[7] = AC100_RTC_UPD_TRIGGER; > + > + /* Is it a leap year? */ > + if (is_leap_year(year + AC100_YEAR_OFF + 1900)) > + reg[6] |= AC100_RTC_YEA_LEAP; > + > + return regmap_bulk_write(regmap, AC100_RTC_SEC, reg, 8); > +} > + > +static int ac100_rtc_alarm_irq_enable(struct device *dev, unsigned int en) > +{ > + struct ac100_rtc_dev *chip = dev_get_drvdata(dev); > + struct regmap *regmap = chip->regmap; > + unsigned int val; > + > + val = en ? AC100_ALM_INT_ENABLE : 0; > + > + return regmap_write(regmap, AC100_ALM_INT_ENA, val); > +} > + > +static int ac100_rtc_get_alarm(struct device *dev, struct rtc_wkalrm *alrm) > +{ > + struct ac100_rtc_dev *chip = dev_get_drvdata(dev); > + struct regmap *regmap = chip->regmap; > + struct rtc_time *alrm_tm = &alrm->time; > + u16 reg[7]; > + unsigned int val; > + int ret; > + > + ret = regmap_read(regmap, AC100_ALM_INT_ENA, &val); > + if (ret) > + return ret; > + > + alrm->enabled = !!(val & AC100_ALM_INT_ENABLE); > + > + ret = regmap_bulk_read(regmap, AC100_ALM_SEC, reg, 7); > + if (ret) > + return ret; > + > + alrm_tm->tm_sec = bcd2bin(reg[0] & AC100_ALM_SEC_MASK); > + alrm_tm->tm_min = bcd2bin(reg[1] & AC100_ALM_MIN_MASK); > + alrm_tm->tm_hour = bcd2bin(reg[2] & AC100_ALM_HOU_MASK); > + alrm_tm->tm_wday = bcd2bin(reg[3] & AC100_ALM_WEE_MASK); > + alrm_tm->tm_mday = bcd2bin(reg[4] & AC100_ALM_DAY_MASK); > + alrm_tm->tm_mon = bcd2bin(reg[5] & AC100_ALM_MON_MASK) - 1; > + alrm_tm->tm_year = bcd2bin(reg[6] & AC100_ALM_YEA_MASK) + > + AC100_YEAR_OFF; > + > + return 0; > +} > + > +static int ac100_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) > +{ > + struct ac100_rtc_dev *chip = dev_get_drvdata(dev); > + struct regmap *regmap = chip->regmap; > + struct rtc_time *alrm_tm = &alrm->time; > + u16 reg[8]; > + int year; > + int ret; > + > + /* our alarm has a limited year range... */ > + year = alrm_tm->tm_year - AC100_YEAR_OFF; > + if (year < 0 || year > (AC100_YEAR_MAX - 1900)) { > + dev_err(dev, "alarm only supports year in range %d - %d\n", > + AC100_YEAR_MIN, AC100_YEAR_MAX); > + return -EINVAL; > + } > + > + /* convert to BCD */ > + reg[0] = (bin2bcd(alrm_tm->tm_sec) & AC100_ALM_SEC_MASK) | > + AC100_ALM_ENABLE_FLAG; > + reg[1] = (bin2bcd(alrm_tm->tm_min) & AC100_ALM_MIN_MASK) | > + AC100_ALM_ENABLE_FLAG; > + reg[2] = (bin2bcd(alrm_tm->tm_hour) & AC100_ALM_HOU_MASK) | > + AC100_ALM_ENABLE_FLAG; > + /* Do not enable weekday alarm */ > + reg[3] = bin2bcd(alrm_tm->tm_wday) & AC100_ALM_WEE_MASK; > + reg[4] = (bin2bcd(alrm_tm->tm_mday) & AC100_ALM_DAY_MASK) | > + AC100_ALM_ENABLE_FLAG; > + reg[5] = (bin2bcd(alrm_tm->tm_mon + 1) & AC100_ALM_MON_MASK) | > + AC100_ALM_ENABLE_FLAG; > + reg[6] = (bin2bcd(year) & AC100_ALM_YEA_MASK) | > + AC100_ALM_ENABLE_FLAG; > + /* trigger write */ > + reg[7] = AC100_ALM_UPD_TRIGGER; > + > + ret = regmap_bulk_write(regmap, AC100_ALM_SEC, reg, 8); > + if (ret) > + return ret; > + > + return ac100_rtc_alarm_irq_enable(dev, alrm->enabled); > +} > + > +static irqreturn_t ac100_rtc_irq(int irq, void *data) > +{ > + struct ac100_rtc_dev *chip = data; > + struct regmap *regmap = chip->regmap; > + unsigned int val = 0; > + int ret; > + > + mutex_lock(&chip->rtc->ops_lock); > + > + /* read status */ > + ret = regmap_read(regmap, AC100_ALM_INT_STA, &val); > + if (ret) > + goto out; > + > + if (val & AC100_ALM_INT_ENABLE) { > + /* signal rtc framework */ > + rtc_update_irq(chip->rtc, 1, RTC_AF | RTC_IRQF); > + > + /* clear status */ > + ret = regmap_write(regmap, AC100_ALM_INT_STA, val); > + if (ret) > + goto out; > + > + /* disable interrupt */ > + ret = ac100_rtc_alarm_irq_enable(chip->dev, 0); > + if (ret) > + goto out; > + } > + > +out: > + mutex_unlock(&chip->rtc->ops_lock); > + return IRQ_HANDLED; > +} > + > +static const struct rtc_class_ops ac100_rtc_ops = { > + .read_time = ac100_rtc_get_time, > + .set_time = ac100_rtc_set_time, > + .read_alarm = ac100_rtc_get_alarm, > + .set_alarm = ac100_rtc_set_alarm, > + .alarm_irq_enable = ac100_rtc_alarm_irq_enable, > +}; > + > +static int ac100_rtc_probe(struct platform_device *pdev) > +{ > + struct ac100_dev *ac100 = dev_get_drvdata(pdev->dev.parent); > + struct ac100_rtc_dev *chip; > + int ret; > + > + chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); > + platform_set_drvdata(pdev, chip); > + chip->dev = &pdev->dev; > + chip->regmap = ac100->regmap; > + > + chip->irq = platform_get_irq(pdev, 0); > + if (chip->irq < 0) { > + dev_err(&pdev->dev, "No IRQ resource\n"); > + return chip->irq; > + } > + > + ret = devm_request_threaded_irq(&pdev->dev, chip->irq, NULL, > + ac100_rtc_irq, > + IRQF_SHARED | IRQF_ONESHOT, > + dev_name(&pdev->dev), chip); > + if (ret) { > + dev_err(&pdev->dev, "Could not request IRQ\n"); > + return ret; > + } > + > + /* always use 24 hour mode */ > + regmap_write_bits(chip->regmap, AC100_RTC_CTRL, AC100_RTC_CTRL_24HOUR, > + AC100_RTC_CTRL_24HOUR); > + > + /* disable counter alarm interrupt */ > + regmap_write(chip->regmap, AC100_ALM_INT_ENA, 0); > + > + /* 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); > + } > + > + dev_info(&pdev->dev, "RTC enabled\n"); > + > + return 0; > +} > + > +static const struct of_device_id ac100_rtc_match[] = { > + { .compatible = "x-powers,ac100-rtc" }, > + { }, > +}; > +MODULE_DEVICE_TABLE(of, ac100_rtc_match); > + > +static struct platform_driver ac100_rtc_driver = { > + .probe = ac100_rtc_probe, > + .driver = { > + .name = "ac100-rtc", > + .of_match_table = of_match_ptr(ac100_rtc_match), > + }, > +}; > +module_platform_driver(ac100_rtc_driver); > + > +MODULE_DESCRIPTION("X-Powers AC100 RTC driver"); > +MODULE_AUTHOR("Chen-Yu Tsai <wens@xxxxxxxx>"); > +MODULE_LICENSE("GPL v2"); > -- > 2.8.1 > -- Alexandre Belloni, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com -- 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