361 lines
8.8 KiB
C
361 lines
8.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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//
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// Copyright (C) 2018 ROHM Semiconductors
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//
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// RTC driver for ROHM BD71828 and BD71815 PMIC
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#include <linux/bcd.h>
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#include <linux/mfd/rohm-bd71815.h>
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#include <linux/mfd/rohm-bd71828.h>
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#include <linux/module.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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/*
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* On BD71828 and BD71815 the ALM0 MASK is 14 bytes after the ALM0
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* block start
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*/
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#define BD718XX_ALM_EN_OFFSET 14
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/*
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* We read regs RTC_SEC => RTC_YEAR
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* this struct is ordered according to chip registers.
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* Keep it u8 only (or packed) to avoid padding issues.
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*/
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struct bd70528_rtc_day {
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u8 sec;
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u8 min;
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u8 hour;
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} __packed;
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struct bd70528_rtc_data {
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struct bd70528_rtc_day time;
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u8 week;
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u8 day;
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u8 month;
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u8 year;
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} __packed;
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struct bd71828_rtc_alm {
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struct bd70528_rtc_data alm0;
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struct bd70528_rtc_data alm1;
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u8 alm_mask;
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u8 alm1_mask;
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} __packed;
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struct bd70528_rtc {
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struct rohm_regmap_dev *parent;
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struct regmap *regmap;
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struct device *dev;
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u8 reg_time_start;
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u8 bd718xx_alm_block_start;
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};
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static inline void tmday2rtc(struct rtc_time *t, struct bd70528_rtc_day *d)
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{
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d->sec &= ~BD70528_MASK_RTC_SEC;
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d->min &= ~BD70528_MASK_RTC_MINUTE;
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d->hour &= ~BD70528_MASK_RTC_HOUR;
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d->sec |= bin2bcd(t->tm_sec);
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d->min |= bin2bcd(t->tm_min);
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d->hour |= bin2bcd(t->tm_hour);
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}
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static inline void tm2rtc(struct rtc_time *t, struct bd70528_rtc_data *r)
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{
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r->day &= ~BD70528_MASK_RTC_DAY;
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r->week &= ~BD70528_MASK_RTC_WEEK;
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r->month &= ~BD70528_MASK_RTC_MONTH;
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/*
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* PM and 24H bits are not used by Wake - thus we clear them
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* here and not in tmday2rtc() which is also used by wake.
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*/
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r->time.hour &= ~(BD70528_MASK_RTC_HOUR_PM | BD70528_MASK_RTC_HOUR_24H);
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tmday2rtc(t, &r->time);
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/*
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* We do always set time in 24H mode.
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*/
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r->time.hour |= BD70528_MASK_RTC_HOUR_24H;
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r->day |= bin2bcd(t->tm_mday);
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r->week |= bin2bcd(t->tm_wday);
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r->month |= bin2bcd(t->tm_mon + 1);
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r->year = bin2bcd(t->tm_year - 100);
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}
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static inline void rtc2tm(struct bd70528_rtc_data *r, struct rtc_time *t)
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{
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t->tm_sec = bcd2bin(r->time.sec & BD70528_MASK_RTC_SEC);
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t->tm_min = bcd2bin(r->time.min & BD70528_MASK_RTC_MINUTE);
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t->tm_hour = bcd2bin(r->time.hour & BD70528_MASK_RTC_HOUR);
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/*
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* If RTC is in 12H mode, then bit BD70528_MASK_RTC_HOUR_PM
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* is not BCD value but tells whether it is AM or PM
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*/
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if (!(r->time.hour & BD70528_MASK_RTC_HOUR_24H)) {
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t->tm_hour %= 12;
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if (r->time.hour & BD70528_MASK_RTC_HOUR_PM)
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t->tm_hour += 12;
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}
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t->tm_mday = bcd2bin(r->day & BD70528_MASK_RTC_DAY);
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t->tm_mon = bcd2bin(r->month & BD70528_MASK_RTC_MONTH) - 1;
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t->tm_year = 100 + bcd2bin(r->year & BD70528_MASK_RTC_YEAR);
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t->tm_wday = bcd2bin(r->week & BD70528_MASK_RTC_WEEK);
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}
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static int bd71828_set_alarm(struct device *dev, struct rtc_wkalrm *a)
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{
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int ret;
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struct bd71828_rtc_alm alm;
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struct bd70528_rtc *r = dev_get_drvdata(dev);
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ret = regmap_bulk_read(r->regmap, r->bd718xx_alm_block_start, &alm,
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sizeof(alm));
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if (ret) {
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dev_err(dev, "Failed to read alarm regs\n");
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return ret;
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}
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tm2rtc(&a->time, &alm.alm0);
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if (!a->enabled)
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alm.alm_mask &= ~BD70528_MASK_ALM_EN;
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else
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alm.alm_mask |= BD70528_MASK_ALM_EN;
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ret = regmap_bulk_write(r->regmap, r->bd718xx_alm_block_start, &alm,
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sizeof(alm));
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if (ret)
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dev_err(dev, "Failed to set alarm time\n");
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return ret;
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}
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static int bd71828_read_alarm(struct device *dev, struct rtc_wkalrm *a)
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{
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int ret;
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struct bd71828_rtc_alm alm;
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struct bd70528_rtc *r = dev_get_drvdata(dev);
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ret = regmap_bulk_read(r->regmap, r->bd718xx_alm_block_start, &alm,
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sizeof(alm));
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if (ret) {
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dev_err(dev, "Failed to read alarm regs\n");
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return ret;
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}
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rtc2tm(&alm.alm0, &a->time);
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a->time.tm_mday = -1;
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a->time.tm_mon = -1;
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a->time.tm_year = -1;
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a->enabled = !!(alm.alm_mask & BD70528_MASK_ALM_EN);
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a->pending = 0;
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return 0;
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}
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static int bd71828_set_time(struct device *dev, struct rtc_time *t)
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{
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int ret;
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struct bd70528_rtc_data rtc_data;
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struct bd70528_rtc *r = dev_get_drvdata(dev);
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ret = regmap_bulk_read(r->regmap, r->reg_time_start, &rtc_data,
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sizeof(rtc_data));
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if (ret) {
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dev_err(dev, "Failed to read RTC time registers\n");
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return ret;
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}
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tm2rtc(t, &rtc_data);
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ret = regmap_bulk_write(r->regmap, r->reg_time_start, &rtc_data,
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sizeof(rtc_data));
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if (ret)
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dev_err(dev, "Failed to set RTC time\n");
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return ret;
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}
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static int bd70528_get_time(struct device *dev, struct rtc_time *t)
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{
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struct bd70528_rtc *r = dev_get_drvdata(dev);
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struct bd70528_rtc_data rtc_data;
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int ret;
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/* read the RTC date and time registers all at once */
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ret = regmap_bulk_read(r->regmap, r->reg_time_start, &rtc_data,
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sizeof(rtc_data));
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if (ret) {
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dev_err(dev, "Failed to read RTC time (err %d)\n", ret);
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return ret;
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}
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rtc2tm(&rtc_data, t);
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return 0;
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}
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static int bd71828_alm_enable(struct device *dev, unsigned int enabled)
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{
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int ret;
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struct bd70528_rtc *r = dev_get_drvdata(dev);
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unsigned int enableval = BD70528_MASK_ALM_EN;
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if (!enabled)
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enableval = 0;
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ret = regmap_update_bits(r->regmap, r->bd718xx_alm_block_start +
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BD718XX_ALM_EN_OFFSET, BD70528_MASK_ALM_EN,
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enableval);
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if (ret)
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dev_err(dev, "Failed to change alarm state\n");
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return ret;
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}
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static const struct rtc_class_ops bd71828_rtc_ops = {
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.read_time = bd70528_get_time,
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.set_time = bd71828_set_time,
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.read_alarm = bd71828_read_alarm,
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.set_alarm = bd71828_set_alarm,
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.alarm_irq_enable = bd71828_alm_enable,
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};
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static irqreturn_t alm_hndlr(int irq, void *data)
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{
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struct rtc_device *rtc = data;
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rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF | RTC_PF);
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return IRQ_HANDLED;
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}
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static int bd70528_probe(struct platform_device *pdev)
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{
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struct bd70528_rtc *bd_rtc;
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const struct rtc_class_ops *rtc_ops;
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const char *irq_name;
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int ret;
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struct rtc_device *rtc;
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int irq;
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unsigned int hr;
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u8 hour_reg;
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enum rohm_chip_type chip = platform_get_device_id(pdev)->driver_data;
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bd_rtc = devm_kzalloc(&pdev->dev, sizeof(*bd_rtc), GFP_KERNEL);
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if (!bd_rtc)
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return -ENOMEM;
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bd_rtc->regmap = dev_get_regmap(pdev->dev.parent, NULL);
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if (!bd_rtc->regmap) {
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dev_err(&pdev->dev, "No regmap\n");
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return -EINVAL;
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}
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bd_rtc->dev = &pdev->dev;
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rtc_ops = &bd71828_rtc_ops;
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switch (chip) {
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case ROHM_CHIP_TYPE_BD71815:
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irq_name = "bd71815-rtc-alm-0";
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bd_rtc->reg_time_start = BD71815_REG_RTC_START;
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/*
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* See also BD718XX_ALM_EN_OFFSET:
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* This works for BD71828 and BD71815 as they have same offset
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* between ALM0 start and ALM0_MASK. If new ICs are to be
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* added this requires proper check as ALM0_MASK is not located
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* at the end of ALM0 block - but after all ALM blocks so if
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* amount of ALMs differ the offset to enable/disable is likely
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* to be incorrect and enable/disable must be given as own
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* reg address here.
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*/
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bd_rtc->bd718xx_alm_block_start = BD71815_REG_RTC_ALM_START;
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hour_reg = BD71815_REG_HOUR;
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break;
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case ROHM_CHIP_TYPE_BD71828:
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irq_name = "bd71828-rtc-alm-0";
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bd_rtc->reg_time_start = BD71828_REG_RTC_START;
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bd_rtc->bd718xx_alm_block_start = BD71828_REG_RTC_ALM_START;
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hour_reg = BD71828_REG_RTC_HOUR;
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break;
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default:
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dev_err(&pdev->dev, "Unknown chip\n");
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return -ENOENT;
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}
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irq = platform_get_irq_byname(pdev, irq_name);
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if (irq < 0)
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return irq;
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platform_set_drvdata(pdev, bd_rtc);
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ret = regmap_read(bd_rtc->regmap, hour_reg, &hr);
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if (ret) {
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dev_err(&pdev->dev, "Failed to reag RTC clock\n");
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return ret;
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}
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if (!(hr & BD70528_MASK_RTC_HOUR_24H)) {
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struct rtc_time t;
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ret = rtc_ops->read_time(&pdev->dev, &t);
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if (!ret)
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ret = rtc_ops->set_time(&pdev->dev, &t);
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if (ret) {
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dev_err(&pdev->dev,
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"Setting 24H clock for RTC failed\n");
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return ret;
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}
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}
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device_set_wakeup_capable(&pdev->dev, true);
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device_wakeup_enable(&pdev->dev);
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rtc = devm_rtc_allocate_device(&pdev->dev);
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if (IS_ERR(rtc)) {
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dev_err(&pdev->dev, "RTC device creation failed\n");
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return PTR_ERR(rtc);
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}
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rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
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rtc->range_max = RTC_TIMESTAMP_END_2099;
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rtc->ops = rtc_ops;
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/* Request alarm IRQ prior to registerig the RTC */
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ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, &alm_hndlr,
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IRQF_ONESHOT, "bd70528-rtc", rtc);
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if (ret)
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return ret;
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return devm_rtc_register_device(rtc);
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}
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static const struct platform_device_id bd718x7_rtc_id[] = {
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{ "bd71828-rtc", ROHM_CHIP_TYPE_BD71828 },
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{ "bd71815-rtc", ROHM_CHIP_TYPE_BD71815 },
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{ },
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};
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MODULE_DEVICE_TABLE(platform, bd718x7_rtc_id);
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static struct platform_driver bd70528_rtc = {
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.driver = {
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.name = "bd70528-rtc"
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},
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.probe = bd70528_probe,
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.id_table = bd718x7_rtc_id,
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};
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module_platform_driver(bd70528_rtc);
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MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
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MODULE_DESCRIPTION("ROHM BD71828 and BD71815 PMIC RTC driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:bd70528-rtc");
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