forked from Minki/linux
afe19a7ae8
The module alias platform tag contains a spelling mistake. Fix it. Fixes: f33506abbcdd ("rtc: bd70528: Add MODULE ALIAS to autoload module") Signed-off-by: Colin Ian King <colin.king@canonical.com> Link: https://lore.kernel.org/r/20191106083418.159045-1-colin.king@canonical.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
495 lines
12 KiB
C
495 lines
12 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 BD70528 PMIC
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#include <linux/bcd.h>
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#include <linux/mfd/rohm-bd70528.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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* 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 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 bd70528_rtc_wake {
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struct bd70528_rtc_day time;
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u8 ctrl;
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} __packed;
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struct bd70528_rtc_alm {
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struct bd70528_rtc_data data;
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u8 alm_mask;
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u8 alm_repeat;
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} __packed;
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struct bd70528_rtc {
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struct rohm_regmap_dev *mfd;
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struct device *dev;
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};
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static int bd70528_set_wake(struct rohm_regmap_dev *bd70528,
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int enable, int *old_state)
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{
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int ret;
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unsigned int ctrl_reg;
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ret = regmap_read(bd70528->regmap, BD70528_REG_WAKE_EN, &ctrl_reg);
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if (ret)
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return ret;
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if (old_state) {
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if (ctrl_reg & BD70528_MASK_WAKE_EN)
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*old_state |= BD70528_WAKE_STATE_BIT;
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else
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*old_state &= ~BD70528_WAKE_STATE_BIT;
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if (!enable == !(*old_state & BD70528_WAKE_STATE_BIT))
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return 0;
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}
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if (enable)
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ctrl_reg |= BD70528_MASK_WAKE_EN;
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else
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ctrl_reg &= ~BD70528_MASK_WAKE_EN;
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return regmap_write(bd70528->regmap, BD70528_REG_WAKE_EN,
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ctrl_reg);
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}
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static int bd70528_set_elapsed_tmr(struct rohm_regmap_dev *bd70528,
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int enable, int *old_state)
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{
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int ret;
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unsigned int ctrl_reg;
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/*
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* TBD
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* What is the purpose of elapsed timer ?
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* Is the timeout registers counting down, or is the disable - re-enable
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* going to restart the elapsed-time counting? If counting is restarted
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* the timeout should be decreased by the amount of time that has
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* elapsed since starting the timer. Maybe we should store the monotonic
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* clock value when timer is started so that if RTC is set while timer
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* is armed we could do the compensation. This is a hack if RTC/system
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* clk are drifting. OTOH, RTC controlled via I2C is in any case
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* inaccurate...
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*/
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ret = regmap_read(bd70528->regmap, BD70528_REG_ELAPSED_TIMER_EN,
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&ctrl_reg);
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if (ret)
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return ret;
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if (old_state) {
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if (ctrl_reg & BD70528_MASK_ELAPSED_TIMER_EN)
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*old_state |= BD70528_ELAPSED_STATE_BIT;
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else
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*old_state &= ~BD70528_ELAPSED_STATE_BIT;
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if ((!enable) == (!(*old_state & BD70528_ELAPSED_STATE_BIT)))
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return 0;
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}
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if (enable)
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ctrl_reg |= BD70528_MASK_ELAPSED_TIMER_EN;
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else
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ctrl_reg &= ~BD70528_MASK_ELAPSED_TIMER_EN;
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return regmap_write(bd70528->regmap, BD70528_REG_ELAPSED_TIMER_EN,
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ctrl_reg);
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}
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static int bd70528_set_rtc_based_timers(struct bd70528_rtc *r, int new_state,
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int *old_state)
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{
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int ret;
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ret = bd70528_wdt_set(r->mfd, new_state & BD70528_WDT_STATE_BIT,
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old_state);
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if (ret) {
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dev_err(r->dev,
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"Failed to disable WDG for RTC setting (%d)\n", ret);
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return ret;
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}
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ret = bd70528_set_elapsed_tmr(r->mfd,
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new_state & BD70528_ELAPSED_STATE_BIT,
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old_state);
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if (ret) {
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dev_err(r->dev,
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"Failed to disable 'elapsed timer' for RTC setting\n");
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return ret;
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}
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ret = bd70528_set_wake(r->mfd, new_state & BD70528_WAKE_STATE_BIT,
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old_state);
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if (ret) {
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dev_err(r->dev,
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"Failed to disable 'wake timer' for RTC setting\n");
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return ret;
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}
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return ret;
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}
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static int bd70528_re_enable_rtc_based_timers(struct bd70528_rtc *r,
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int old_state)
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{
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return bd70528_set_rtc_based_timers(r, old_state, NULL);
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}
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static int bd70528_disable_rtc_based_timers(struct bd70528_rtc *r,
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int *old_state)
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{
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return bd70528_set_rtc_based_timers(r, 0, old_state);
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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 bd70528_set_alarm(struct device *dev, struct rtc_wkalrm *a)
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{
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struct bd70528_rtc_wake wake;
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struct bd70528_rtc_alm alm;
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int ret;
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struct bd70528_rtc *r = dev_get_drvdata(dev);
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struct rohm_regmap_dev *bd70528 = r->mfd;
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ret = regmap_bulk_read(bd70528->regmap, BD70528_REG_RTC_WAKE_START,
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&wake, sizeof(wake));
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if (ret) {
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dev_err(dev, "Failed to read wake regs\n");
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return ret;
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}
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ret = regmap_bulk_read(bd70528->regmap, BD70528_REG_RTC_ALM_START,
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&alm, 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.data);
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tmday2rtc(&a->time, &wake.time);
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if (a->enabled) {
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alm.alm_mask &= ~BD70528_MASK_ALM_EN;
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wake.ctrl |= BD70528_MASK_WAKE_EN;
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} else {
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alm.alm_mask |= BD70528_MASK_ALM_EN;
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wake.ctrl &= ~BD70528_MASK_WAKE_EN;
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}
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ret = regmap_bulk_write(bd70528->regmap,
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BD70528_REG_RTC_WAKE_START, &wake,
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sizeof(wake));
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if (ret) {
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dev_err(dev, "Failed to set wake time\n");
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return ret;
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}
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ret = regmap_bulk_write(bd70528->regmap, BD70528_REG_RTC_ALM_START,
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&alm, 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 bd70528_read_alarm(struct device *dev, struct rtc_wkalrm *a)
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{
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struct bd70528_rtc_alm alm;
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int ret;
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struct bd70528_rtc *r = dev_get_drvdata(dev);
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struct rohm_regmap_dev *bd70528 = r->mfd;
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ret = regmap_bulk_read(bd70528->regmap, BD70528_REG_RTC_ALM_START,
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&alm, 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.data, &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 bd70528_set_time_locked(struct device *dev, struct rtc_time *t)
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{
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int ret, tmpret, old_states;
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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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struct rohm_regmap_dev *bd70528 = r->mfd;
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ret = bd70528_disable_rtc_based_timers(r, &old_states);
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if (ret)
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return ret;
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tmpret = regmap_bulk_read(bd70528->regmap,
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BD70528_REG_RTC_START, &rtc_data,
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sizeof(rtc_data));
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if (tmpret) {
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dev_err(dev, "Failed to read RTC time registers\n");
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goto renable_out;
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}
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tm2rtc(t, &rtc_data);
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tmpret = regmap_bulk_write(bd70528->regmap,
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BD70528_REG_RTC_START, &rtc_data,
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sizeof(rtc_data));
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if (tmpret) {
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dev_err(dev, "Failed to set RTC time\n");
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goto renable_out;
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}
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renable_out:
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ret = bd70528_re_enable_rtc_based_timers(r, old_states);
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if (tmpret)
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ret = tmpret;
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return ret;
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}
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static int bd70528_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 *r = dev_get_drvdata(dev);
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bd70528_wdt_lock(r->mfd);
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ret = bd70528_set_time_locked(dev, t);
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bd70528_wdt_unlock(r->mfd);
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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 rohm_regmap_dev *bd70528 = r->mfd;
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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(bd70528->regmap,
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BD70528_REG_RTC_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 bd70528_alm_enable(struct device *dev, unsigned int enabled)
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{
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int ret;
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unsigned int enableval = BD70528_MASK_ALM_EN;
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struct bd70528_rtc *r = dev_get_drvdata(dev);
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if (enabled)
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enableval = 0;
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bd70528_wdt_lock(r->mfd);
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ret = bd70528_set_wake(r->mfd, enabled, NULL);
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if (ret) {
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dev_err(dev, "Failed to change wake state\n");
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goto out_unlock;
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}
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ret = regmap_update_bits(r->mfd->regmap, BD70528_REG_RTC_ALM_MASK,
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BD70528_MASK_ALM_EN, enableval);
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if (ret)
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dev_err(dev, "Failed to change alarm state\n");
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out_unlock:
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bd70528_wdt_unlock(r->mfd);
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return ret;
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}
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static const struct rtc_class_ops bd70528_rtc_ops = {
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.read_time = bd70528_get_time,
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.set_time = bd70528_set_time,
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.read_alarm = bd70528_read_alarm,
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.set_alarm = bd70528_set_alarm,
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.alarm_irq_enable = bd70528_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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struct rohm_regmap_dev *mfd;
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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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mfd = dev_get_drvdata(pdev->dev.parent);
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if (!mfd) {
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dev_err(&pdev->dev, "No MFD driver data\n");
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return -EINVAL;
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}
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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->mfd = mfd;
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bd_rtc->dev = &pdev->dev;
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irq = platform_get_irq_byname(pdev, "bd70528-rtc-alm");
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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(mfd->regmap, BD70528_REG_RTC_HOUR, &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 = bd70528_get_time(&pdev->dev, &t);
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if (!ret)
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ret = bd70528_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 = &bd70528_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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/*
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* BD70528 irq controller is not touching the main mask register.
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* So enable the RTC block interrupts at main level. We can just
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* leave them enabled as irq-controller should disable irqs
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* from sub-registers when IRQ is disabled or freed.
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*/
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ret = regmap_update_bits(mfd->regmap,
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BD70528_REG_INT_MAIN_MASK,
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BD70528_INT_RTC_MASK, 0);
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if (ret) {
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dev_err(&pdev->dev, "Failed to enable RTC interrupts\n");
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return ret;
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}
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return rtc_register_device(rtc);
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}
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static struct platform_driver bd70528_rtc = {
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.driver = {
|
|
.name = "bd70528-rtc"
|
|
},
|
|
.probe = bd70528_probe,
|
|
};
|
|
|
|
module_platform_driver(bd70528_rtc);
|
|
|
|
MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
|
|
MODULE_DESCRIPTION("BD70528 RTC driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:bd70528-rtc");
|