rtc: ac100: Add RTC driver for X-Powers AC100
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@csie.org> Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Chen-Yu Tsai
Lee Jones
parent
585083c539
commit
d00a18a42c
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@ -187,6 +187,16 @@ config RTC_DRV_ABX80X
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This driver can also be built as a module. If so, the module
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will be called rtc-abx80x.
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config RTC_DRV_AC100
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tristate "X-Powers AC100"
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depends on MFD_AC100
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help
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If you say yes here you get support for the real-time clock found
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in X-Powers AC100 family peripheral ICs.
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This driver can also be built as a module. If so, the module
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will be called rtc-ac100.
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config RTC_DRV_AS3722
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tristate "ams AS3722 RTC driver"
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depends on MFD_AS3722
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@ -27,6 +27,7 @@ obj-$(CONFIG_RTC_DRV_AB3100) += rtc-ab3100.o
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obj-$(CONFIG_RTC_DRV_AB8500) += rtc-ab8500.o
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obj-$(CONFIG_RTC_DRV_ABB5ZES3) += rtc-ab-b5ze-s3.o
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obj-$(CONFIG_RTC_DRV_ABX80X) += rtc-abx80x.o
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obj-$(CONFIG_RTC_DRV_AC100) += rtc-ac100.o
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obj-$(CONFIG_RTC_DRV_ARMADA38X) += rtc-armada38x.o
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obj-$(CONFIG_RTC_DRV_AS3722) += rtc-as3722.o
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obj-$(CONFIG_RTC_DRV_ASM9260) += rtc-asm9260.o
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@ -0,0 +1,325 @@
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/*
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* RTC Driver for X-Powers AC100
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*
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* Copyright (c) 2016 Chen-Yu Tsai
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*
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* Chen-Yu Tsai <wens@csie.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/bcd.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/mfd/ac100.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/rtc.h>
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#include <linux/types.h>
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/* Control register */
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#define AC100_RTC_CTRL_24HOUR BIT(0)
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/* RTC */
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#define AC100_RTC_SEC_MASK GENMASK(6, 0)
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#define AC100_RTC_MIN_MASK GENMASK(6, 0)
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#define AC100_RTC_HOU_MASK GENMASK(5, 0)
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#define AC100_RTC_WEE_MASK GENMASK(2, 0)
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#define AC100_RTC_DAY_MASK GENMASK(5, 0)
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#define AC100_RTC_MON_MASK GENMASK(4, 0)
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#define AC100_RTC_YEA_MASK GENMASK(7, 0)
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#define AC100_RTC_YEA_LEAP BIT(15)
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#define AC100_RTC_UPD_TRIGGER BIT(15)
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/* Alarm (wall clock) */
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#define AC100_ALM_INT_ENABLE BIT(0)
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#define AC100_ALM_SEC_MASK GENMASK(6, 0)
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#define AC100_ALM_MIN_MASK GENMASK(6, 0)
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#define AC100_ALM_HOU_MASK GENMASK(5, 0)
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#define AC100_ALM_WEE_MASK GENMASK(2, 0)
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#define AC100_ALM_DAY_MASK GENMASK(5, 0)
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#define AC100_ALM_MON_MASK GENMASK(4, 0)
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#define AC100_ALM_YEA_MASK GENMASK(7, 0)
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#define AC100_ALM_ENABLE_FLAG BIT(15)
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#define AC100_ALM_UPD_TRIGGER BIT(15)
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/*
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* The year parameter passed to the driver is usually an offset relative to
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* the year 1900. This macro is used to convert this offset to another one
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* relative to the minimum year allowed by the hardware.
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*
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* The year range is 1970 - 2069. This range is selected to match Allwinner's
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* driver.
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*/
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#define AC100_YEAR_MIN 1970
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#define AC100_YEAR_MAX 2069
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#define AC100_YEAR_OFF (AC100_YEAR_MIN - 1900)
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struct ac100_rtc_dev {
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struct rtc_device *rtc;
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struct device *dev;
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struct regmap *regmap;
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int irq;
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unsigned long alarm;
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};
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static int ac100_rtc_get_time(struct device *dev, struct rtc_time *rtc_tm)
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{
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struct ac100_rtc_dev *chip = dev_get_drvdata(dev);
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struct regmap *regmap = chip->regmap;
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u16 reg[7];
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int ret;
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ret = regmap_bulk_read(regmap, AC100_RTC_SEC, reg, 7);
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if (ret)
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return ret;
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rtc_tm->tm_sec = bcd2bin(reg[0] & AC100_RTC_SEC_MASK);
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rtc_tm->tm_min = bcd2bin(reg[1] & AC100_RTC_MIN_MASK);
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rtc_tm->tm_hour = bcd2bin(reg[2] & AC100_RTC_HOU_MASK);
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rtc_tm->tm_wday = bcd2bin(reg[3] & AC100_RTC_WEE_MASK);
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rtc_tm->tm_mday = bcd2bin(reg[4] & AC100_RTC_DAY_MASK);
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rtc_tm->tm_mon = bcd2bin(reg[5] & AC100_RTC_MON_MASK) - 1;
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rtc_tm->tm_year = bcd2bin(reg[6] & AC100_RTC_YEA_MASK) +
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AC100_YEAR_OFF;
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return rtc_valid_tm(rtc_tm);
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}
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static int ac100_rtc_set_time(struct device *dev, struct rtc_time *rtc_tm)
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{
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struct ac100_rtc_dev *chip = dev_get_drvdata(dev);
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struct regmap *regmap = chip->regmap;
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int year;
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u16 reg[8];
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/* our RTC has a limited year range... */
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year = rtc_tm->tm_year - AC100_YEAR_OFF;
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if (year < 0 || year > (AC100_YEAR_MAX - 1900)) {
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dev_err(dev, "rtc only supports year in range %d - %d\n",
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AC100_YEAR_MIN, AC100_YEAR_MAX);
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return -EINVAL;
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}
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/* convert to BCD */
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reg[0] = bin2bcd(rtc_tm->tm_sec) & AC100_RTC_SEC_MASK;
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reg[1] = bin2bcd(rtc_tm->tm_min) & AC100_RTC_MIN_MASK;
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reg[2] = bin2bcd(rtc_tm->tm_hour) & AC100_RTC_HOU_MASK;
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reg[3] = bin2bcd(rtc_tm->tm_wday) & AC100_RTC_WEE_MASK;
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reg[4] = bin2bcd(rtc_tm->tm_mday) & AC100_RTC_DAY_MASK;
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reg[5] = bin2bcd(rtc_tm->tm_mon + 1) & AC100_RTC_MON_MASK;
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reg[6] = bin2bcd(year) & AC100_RTC_YEA_MASK;
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/* trigger write */
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reg[7] = AC100_RTC_UPD_TRIGGER;
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/* Is it a leap year? */
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if (is_leap_year(year + AC100_YEAR_OFF + 1900))
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reg[6] |= AC100_RTC_YEA_LEAP;
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return regmap_bulk_write(regmap, AC100_RTC_SEC, reg, 8);
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}
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static int ac100_rtc_alarm_irq_enable(struct device *dev, unsigned int en)
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{
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struct ac100_rtc_dev *chip = dev_get_drvdata(dev);
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struct regmap *regmap = chip->regmap;
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unsigned int val;
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val = en ? AC100_ALM_INT_ENABLE : 0;
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return regmap_write(regmap, AC100_ALM_INT_ENA, val);
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}
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static int ac100_rtc_get_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct ac100_rtc_dev *chip = dev_get_drvdata(dev);
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struct regmap *regmap = chip->regmap;
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struct rtc_time *alrm_tm = &alrm->time;
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u16 reg[7];
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unsigned int val;
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int ret;
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ret = regmap_read(regmap, AC100_ALM_INT_ENA, &val);
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if (ret)
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return ret;
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alrm->enabled = !!(val & AC100_ALM_INT_ENABLE);
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ret = regmap_bulk_read(regmap, AC100_ALM_SEC, reg, 7);
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if (ret)
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return ret;
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alrm_tm->tm_sec = bcd2bin(reg[0] & AC100_ALM_SEC_MASK);
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alrm_tm->tm_min = bcd2bin(reg[1] & AC100_ALM_MIN_MASK);
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alrm_tm->tm_hour = bcd2bin(reg[2] & AC100_ALM_HOU_MASK);
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alrm_tm->tm_wday = bcd2bin(reg[3] & AC100_ALM_WEE_MASK);
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alrm_tm->tm_mday = bcd2bin(reg[4] & AC100_ALM_DAY_MASK);
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alrm_tm->tm_mon = bcd2bin(reg[5] & AC100_ALM_MON_MASK) - 1;
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alrm_tm->tm_year = bcd2bin(reg[6] & AC100_ALM_YEA_MASK) +
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AC100_YEAR_OFF;
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return 0;
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}
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static int ac100_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct ac100_rtc_dev *chip = dev_get_drvdata(dev);
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struct regmap *regmap = chip->regmap;
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struct rtc_time *alrm_tm = &alrm->time;
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u16 reg[8];
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int year;
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int ret;
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/* our alarm has a limited year range... */
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year = alrm_tm->tm_year - AC100_YEAR_OFF;
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if (year < 0 || year > (AC100_YEAR_MAX - 1900)) {
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dev_err(dev, "alarm only supports year in range %d - %d\n",
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AC100_YEAR_MIN, AC100_YEAR_MAX);
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return -EINVAL;
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}
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/* convert to BCD */
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reg[0] = (bin2bcd(alrm_tm->tm_sec) & AC100_ALM_SEC_MASK) |
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AC100_ALM_ENABLE_FLAG;
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reg[1] = (bin2bcd(alrm_tm->tm_min) & AC100_ALM_MIN_MASK) |
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AC100_ALM_ENABLE_FLAG;
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reg[2] = (bin2bcd(alrm_tm->tm_hour) & AC100_ALM_HOU_MASK) |
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AC100_ALM_ENABLE_FLAG;
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/* Do not enable weekday alarm */
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reg[3] = bin2bcd(alrm_tm->tm_wday) & AC100_ALM_WEE_MASK;
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reg[4] = (bin2bcd(alrm_tm->tm_mday) & AC100_ALM_DAY_MASK) |
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AC100_ALM_ENABLE_FLAG;
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reg[5] = (bin2bcd(alrm_tm->tm_mon + 1) & AC100_ALM_MON_MASK) |
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AC100_ALM_ENABLE_FLAG;
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reg[6] = (bin2bcd(year) & AC100_ALM_YEA_MASK) |
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AC100_ALM_ENABLE_FLAG;
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/* trigger write */
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reg[7] = AC100_ALM_UPD_TRIGGER;
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ret = regmap_bulk_write(regmap, AC100_ALM_SEC, reg, 8);
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if (ret)
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return ret;
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return ac100_rtc_alarm_irq_enable(dev, alrm->enabled);
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}
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static irqreturn_t ac100_rtc_irq(int irq, void *data)
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{
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struct ac100_rtc_dev *chip = data;
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struct regmap *regmap = chip->regmap;
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unsigned int val = 0;
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int ret;
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mutex_lock(&chip->rtc->ops_lock);
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/* read status */
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ret = regmap_read(regmap, AC100_ALM_INT_STA, &val);
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if (ret)
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goto out;
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if (val & AC100_ALM_INT_ENABLE) {
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/* signal rtc framework */
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rtc_update_irq(chip->rtc, 1, RTC_AF | RTC_IRQF);
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/* clear status */
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ret = regmap_write(regmap, AC100_ALM_INT_STA, val);
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if (ret)
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goto out;
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/* disable interrupt */
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ret = ac100_rtc_alarm_irq_enable(chip->dev, 0);
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if (ret)
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goto out;
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}
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out:
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mutex_unlock(&chip->rtc->ops_lock);
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return IRQ_HANDLED;
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}
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static const struct rtc_class_ops ac100_rtc_ops = {
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.read_time = ac100_rtc_get_time,
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.set_time = ac100_rtc_set_time,
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.read_alarm = ac100_rtc_get_alarm,
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.set_alarm = ac100_rtc_set_alarm,
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.alarm_irq_enable = ac100_rtc_alarm_irq_enable,
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};
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static int ac100_rtc_probe(struct platform_device *pdev)
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{
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struct ac100_dev *ac100 = dev_get_drvdata(pdev->dev.parent);
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struct ac100_rtc_dev *chip;
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int ret;
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chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
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platform_set_drvdata(pdev, chip);
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chip->dev = &pdev->dev;
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chip->regmap = ac100->regmap;
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chip->irq = platform_get_irq(pdev, 0);
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if (chip->irq < 0) {
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dev_err(&pdev->dev, "No IRQ resource\n");
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return chip->irq;
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}
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ret = devm_request_threaded_irq(&pdev->dev, chip->irq, NULL,
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ac100_rtc_irq,
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IRQF_SHARED | IRQF_ONESHOT,
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dev_name(&pdev->dev), chip);
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if (ret) {
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dev_err(&pdev->dev, "Could not request IRQ\n");
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return ret;
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}
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/* always use 24 hour mode */
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regmap_write_bits(chip->regmap, AC100_RTC_CTRL, AC100_RTC_CTRL_24HOUR,
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AC100_RTC_CTRL_24HOUR);
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/* disable counter alarm interrupt */
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regmap_write(chip->regmap, AC100_ALM_INT_ENA, 0);
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/* clear counter alarm pending interrupts */
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regmap_write(chip->regmap, AC100_ALM_INT_STA, AC100_ALM_INT_ENABLE);
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chip->rtc = devm_rtc_device_register(&pdev->dev, "rtc-ac100",
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&ac100_rtc_ops, THIS_MODULE);
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if (IS_ERR(chip->rtc)) {
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dev_err(&pdev->dev, "unable to register device\n");
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return PTR_ERR(chip->rtc);
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}
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dev_info(&pdev->dev, "RTC enabled\n");
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return 0;
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}
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static const struct of_device_id ac100_rtc_match[] = {
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{ .compatible = "x-powers,ac100-rtc" },
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{ },
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};
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MODULE_DEVICE_TABLE(of, ac100_rtc_match);
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static struct platform_driver ac100_rtc_driver = {
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.probe = ac100_rtc_probe,
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.driver = {
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.name = "ac100-rtc",
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.of_match_table = of_match_ptr(ac100_rtc_match),
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},
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};
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module_platform_driver(ac100_rtc_driver);
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MODULE_DESCRIPTION("X-Powers AC100 RTC driver");
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MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
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MODULE_LICENSE("GPL v2");
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