mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-15 23:25:07 +00:00
ed17a2bcbb
This keeps the IRQ enabled during system suspend, if the RTC's wakeup
source is enabled. Since the IRQ is not required to wake from shutdown,
continue to add the wakeup source even if registering the wakeirq fails.
See commit 029d3a6f2f ("rtc: da9063: add as wakeup source").
Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Link: https://lore.kernel.org/r/20230717190937.1301509-1-samuel.holland@sifive.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
524 lines
15 KiB
C
524 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Real time clock device driver for DA9063
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* Copyright (C) 2013-2015 Dialog Semiconductor Ltd.
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*/
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.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/pm_wakeirq.h>
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#include <linux/regmap.h>
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#include <linux/rtc.h>
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#include <linux/slab.h>
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#include <linux/mfd/da9062/registers.h>
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#include <linux/mfd/da9063/registers.h>
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#include <linux/mfd/da9063/core.h>
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#define YEARS_TO_DA9063(year) ((year) - 100)
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#define MONTHS_TO_DA9063(month) ((month) + 1)
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#define YEARS_FROM_DA9063(year) ((year) + 100)
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#define MONTHS_FROM_DA9063(month) ((month) - 1)
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enum {
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RTC_SEC = 0,
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RTC_MIN = 1,
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RTC_HOUR = 2,
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RTC_DAY = 3,
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RTC_MONTH = 4,
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RTC_YEAR = 5,
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RTC_DATA_LEN
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};
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struct da9063_compatible_rtc_regmap {
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/* REGS */
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int rtc_enable_reg;
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int rtc_enable_32k_crystal_reg;
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int rtc_alarm_secs_reg;
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int rtc_alarm_year_reg;
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int rtc_count_secs_reg;
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int rtc_count_year_reg;
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int rtc_event_reg;
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/* MASKS */
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int rtc_enable_mask;
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int rtc_crystal_mask;
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int rtc_event_alarm_mask;
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int rtc_alarm_on_mask;
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int rtc_alarm_status_mask;
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int rtc_tick_on_mask;
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int rtc_ready_to_read_mask;
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int rtc_count_sec_mask;
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int rtc_count_min_mask;
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int rtc_count_hour_mask;
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int rtc_count_day_mask;
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int rtc_count_month_mask;
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int rtc_count_year_mask;
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/* ALARM CONFIG */
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int rtc_data_start;
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int rtc_alarm_len;
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};
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struct da9063_compatible_rtc {
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struct rtc_device *rtc_dev;
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struct rtc_time alarm_time;
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struct regmap *regmap;
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const struct da9063_compatible_rtc_regmap *config;
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bool rtc_sync;
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};
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static const struct da9063_compatible_rtc_regmap da9063_ad_regs = {
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/* REGS */
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.rtc_enable_reg = DA9063_REG_CONTROL_E,
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.rtc_alarm_secs_reg = DA9063_AD_REG_ALARM_MI,
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.rtc_alarm_year_reg = DA9063_AD_REG_ALARM_Y,
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.rtc_count_secs_reg = DA9063_REG_COUNT_S,
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.rtc_count_year_reg = DA9063_REG_COUNT_Y,
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.rtc_event_reg = DA9063_REG_EVENT_A,
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/* MASKS */
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.rtc_enable_mask = DA9063_RTC_EN,
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.rtc_crystal_mask = DA9063_CRYSTAL,
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.rtc_enable_32k_crystal_reg = DA9063_REG_EN_32K,
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.rtc_event_alarm_mask = DA9063_E_ALARM,
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.rtc_alarm_on_mask = DA9063_ALARM_ON,
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.rtc_alarm_status_mask = DA9063_ALARM_STATUS_ALARM |
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DA9063_ALARM_STATUS_TICK,
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.rtc_tick_on_mask = DA9063_TICK_ON,
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.rtc_ready_to_read_mask = DA9063_RTC_READ,
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.rtc_count_sec_mask = DA9063_COUNT_SEC_MASK,
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.rtc_count_min_mask = DA9063_COUNT_MIN_MASK,
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.rtc_count_hour_mask = DA9063_COUNT_HOUR_MASK,
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.rtc_count_day_mask = DA9063_COUNT_DAY_MASK,
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.rtc_count_month_mask = DA9063_COUNT_MONTH_MASK,
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.rtc_count_year_mask = DA9063_COUNT_YEAR_MASK,
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/* ALARM CONFIG */
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.rtc_data_start = RTC_MIN,
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.rtc_alarm_len = RTC_DATA_LEN - 1,
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};
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static const struct da9063_compatible_rtc_regmap da9063_bb_regs = {
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/* REGS */
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.rtc_enable_reg = DA9063_REG_CONTROL_E,
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.rtc_alarm_secs_reg = DA9063_BB_REG_ALARM_S,
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.rtc_alarm_year_reg = DA9063_BB_REG_ALARM_Y,
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.rtc_count_secs_reg = DA9063_REG_COUNT_S,
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.rtc_count_year_reg = DA9063_REG_COUNT_Y,
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.rtc_event_reg = DA9063_REG_EVENT_A,
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/* MASKS */
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.rtc_enable_mask = DA9063_RTC_EN,
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.rtc_crystal_mask = DA9063_CRYSTAL,
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.rtc_enable_32k_crystal_reg = DA9063_REG_EN_32K,
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.rtc_event_alarm_mask = DA9063_E_ALARM,
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.rtc_alarm_on_mask = DA9063_ALARM_ON,
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.rtc_alarm_status_mask = DA9063_ALARM_STATUS_ALARM |
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DA9063_ALARM_STATUS_TICK,
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.rtc_tick_on_mask = DA9063_TICK_ON,
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.rtc_ready_to_read_mask = DA9063_RTC_READ,
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.rtc_count_sec_mask = DA9063_COUNT_SEC_MASK,
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.rtc_count_min_mask = DA9063_COUNT_MIN_MASK,
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.rtc_count_hour_mask = DA9063_COUNT_HOUR_MASK,
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.rtc_count_day_mask = DA9063_COUNT_DAY_MASK,
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.rtc_count_month_mask = DA9063_COUNT_MONTH_MASK,
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.rtc_count_year_mask = DA9063_COUNT_YEAR_MASK,
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/* ALARM CONFIG */
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.rtc_data_start = RTC_SEC,
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.rtc_alarm_len = RTC_DATA_LEN,
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};
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static const struct da9063_compatible_rtc_regmap da9062_aa_regs = {
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/* REGS */
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.rtc_enable_reg = DA9062AA_CONTROL_E,
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.rtc_alarm_secs_reg = DA9062AA_ALARM_S,
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.rtc_alarm_year_reg = DA9062AA_ALARM_Y,
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.rtc_count_secs_reg = DA9062AA_COUNT_S,
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.rtc_count_year_reg = DA9062AA_COUNT_Y,
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.rtc_event_reg = DA9062AA_EVENT_A,
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/* MASKS */
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.rtc_enable_mask = DA9062AA_RTC_EN_MASK,
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.rtc_crystal_mask = DA9062AA_CRYSTAL_MASK,
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.rtc_enable_32k_crystal_reg = DA9062AA_EN_32K,
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.rtc_event_alarm_mask = DA9062AA_M_ALARM_MASK,
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.rtc_alarm_on_mask = DA9062AA_ALARM_ON_MASK,
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.rtc_alarm_status_mask = (0x02 << 6),
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.rtc_tick_on_mask = DA9062AA_TICK_ON_MASK,
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.rtc_ready_to_read_mask = DA9062AA_RTC_READ_MASK,
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.rtc_count_sec_mask = DA9062AA_COUNT_SEC_MASK,
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.rtc_count_min_mask = DA9062AA_COUNT_MIN_MASK,
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.rtc_count_hour_mask = DA9062AA_COUNT_HOUR_MASK,
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.rtc_count_day_mask = DA9062AA_COUNT_DAY_MASK,
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.rtc_count_month_mask = DA9062AA_COUNT_MONTH_MASK,
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.rtc_count_year_mask = DA9062AA_COUNT_YEAR_MASK,
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/* ALARM CONFIG */
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.rtc_data_start = RTC_SEC,
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.rtc_alarm_len = RTC_DATA_LEN,
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};
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static const struct of_device_id da9063_compatible_reg_id_table[] = {
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{ .compatible = "dlg,da9063-rtc", .data = &da9063_bb_regs },
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{ .compatible = "dlg,da9062-rtc", .data = &da9062_aa_regs },
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{ },
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};
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MODULE_DEVICE_TABLE(of, da9063_compatible_reg_id_table);
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static void da9063_data_to_tm(u8 *data, struct rtc_time *tm,
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struct da9063_compatible_rtc *rtc)
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{
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const struct da9063_compatible_rtc_regmap *config = rtc->config;
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tm->tm_sec = data[RTC_SEC] & config->rtc_count_sec_mask;
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tm->tm_min = data[RTC_MIN] & config->rtc_count_min_mask;
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tm->tm_hour = data[RTC_HOUR] & config->rtc_count_hour_mask;
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tm->tm_mday = data[RTC_DAY] & config->rtc_count_day_mask;
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tm->tm_mon = MONTHS_FROM_DA9063(data[RTC_MONTH] &
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config->rtc_count_month_mask);
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tm->tm_year = YEARS_FROM_DA9063(data[RTC_YEAR] &
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config->rtc_count_year_mask);
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}
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static void da9063_tm_to_data(struct rtc_time *tm, u8 *data,
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struct da9063_compatible_rtc *rtc)
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{
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const struct da9063_compatible_rtc_regmap *config = rtc->config;
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data[RTC_SEC] = tm->tm_sec & config->rtc_count_sec_mask;
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data[RTC_MIN] = tm->tm_min & config->rtc_count_min_mask;
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data[RTC_HOUR] = tm->tm_hour & config->rtc_count_hour_mask;
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data[RTC_DAY] = tm->tm_mday & config->rtc_count_day_mask;
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data[RTC_MONTH] = MONTHS_TO_DA9063(tm->tm_mon) &
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config->rtc_count_month_mask;
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data[RTC_YEAR] = YEARS_TO_DA9063(tm->tm_year) &
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config->rtc_count_year_mask;
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}
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static int da9063_rtc_stop_alarm(struct device *dev)
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{
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struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
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const struct da9063_compatible_rtc_regmap *config = rtc->config;
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return regmap_update_bits(rtc->regmap,
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config->rtc_alarm_year_reg,
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config->rtc_alarm_on_mask,
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0);
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}
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static int da9063_rtc_start_alarm(struct device *dev)
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{
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struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
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const struct da9063_compatible_rtc_regmap *config = rtc->config;
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return regmap_update_bits(rtc->regmap,
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config->rtc_alarm_year_reg,
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config->rtc_alarm_on_mask,
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config->rtc_alarm_on_mask);
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}
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static int da9063_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
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const struct da9063_compatible_rtc_regmap *config = rtc->config;
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unsigned long tm_secs;
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unsigned long al_secs;
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u8 data[RTC_DATA_LEN];
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int ret;
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ret = regmap_bulk_read(rtc->regmap,
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config->rtc_count_secs_reg,
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data, RTC_DATA_LEN);
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if (ret < 0) {
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dev_err(dev, "Failed to read RTC time data: %d\n", ret);
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return ret;
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}
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if (!(data[RTC_SEC] & config->rtc_ready_to_read_mask)) {
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dev_dbg(dev, "RTC not yet ready to be read by the host\n");
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return -EINVAL;
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}
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da9063_data_to_tm(data, tm, rtc);
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tm_secs = rtc_tm_to_time64(tm);
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al_secs = rtc_tm_to_time64(&rtc->alarm_time);
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/* handle the rtc synchronisation delay */
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if (rtc->rtc_sync && al_secs - tm_secs == 1)
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memcpy(tm, &rtc->alarm_time, sizeof(struct rtc_time));
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else
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rtc->rtc_sync = false;
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return 0;
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}
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static int da9063_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
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const struct da9063_compatible_rtc_regmap *config = rtc->config;
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u8 data[RTC_DATA_LEN];
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int ret;
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da9063_tm_to_data(tm, data, rtc);
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ret = regmap_bulk_write(rtc->regmap,
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config->rtc_count_secs_reg,
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data, RTC_DATA_LEN);
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if (ret < 0)
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dev_err(dev, "Failed to set RTC time data: %d\n", ret);
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return ret;
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}
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static int da9063_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
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const struct da9063_compatible_rtc_regmap *config = rtc->config;
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u8 data[RTC_DATA_LEN];
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int ret;
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unsigned int val;
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data[RTC_SEC] = 0;
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ret = regmap_bulk_read(rtc->regmap,
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config->rtc_alarm_secs_reg,
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&data[config->rtc_data_start],
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config->rtc_alarm_len);
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if (ret < 0)
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return ret;
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da9063_data_to_tm(data, &alrm->time, rtc);
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alrm->enabled = !!(data[RTC_YEAR] & config->rtc_alarm_on_mask);
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ret = regmap_read(rtc->regmap,
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config->rtc_event_reg,
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&val);
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if (ret < 0)
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return ret;
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if (val & config->rtc_event_alarm_mask)
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alrm->pending = 1;
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else
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alrm->pending = 0;
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return 0;
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}
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static int da9063_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct da9063_compatible_rtc *rtc = dev_get_drvdata(dev);
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const struct da9063_compatible_rtc_regmap *config = rtc->config;
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u8 data[RTC_DATA_LEN];
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int ret;
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da9063_tm_to_data(&alrm->time, data, rtc);
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ret = da9063_rtc_stop_alarm(dev);
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if (ret < 0) {
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dev_err(dev, "Failed to stop alarm: %d\n", ret);
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return ret;
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}
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ret = regmap_bulk_write(rtc->regmap,
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config->rtc_alarm_secs_reg,
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&data[config->rtc_data_start],
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config->rtc_alarm_len);
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if (ret < 0) {
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dev_err(dev, "Failed to write alarm: %d\n", ret);
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return ret;
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}
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da9063_data_to_tm(data, &rtc->alarm_time, rtc);
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if (alrm->enabled) {
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ret = da9063_rtc_start_alarm(dev);
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if (ret < 0) {
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dev_err(dev, "Failed to start alarm: %d\n", ret);
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return ret;
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}
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}
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return ret;
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}
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static int da9063_rtc_alarm_irq_enable(struct device *dev,
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unsigned int enabled)
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{
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if (enabled)
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return da9063_rtc_start_alarm(dev);
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else
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return da9063_rtc_stop_alarm(dev);
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}
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static irqreturn_t da9063_alarm_event(int irq, void *data)
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{
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struct da9063_compatible_rtc *rtc = data;
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const struct da9063_compatible_rtc_regmap *config = rtc->config;
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regmap_update_bits(rtc->regmap,
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config->rtc_alarm_year_reg,
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config->rtc_alarm_on_mask,
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0);
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rtc->rtc_sync = true;
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rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);
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return IRQ_HANDLED;
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}
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static const struct rtc_class_ops da9063_rtc_ops = {
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.read_time = da9063_rtc_read_time,
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.set_time = da9063_rtc_set_time,
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.read_alarm = da9063_rtc_read_alarm,
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.set_alarm = da9063_rtc_set_alarm,
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.alarm_irq_enable = da9063_rtc_alarm_irq_enable,
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};
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static int da9063_rtc_probe(struct platform_device *pdev)
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{
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struct da9063_compatible_rtc *rtc;
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const struct da9063_compatible_rtc_regmap *config;
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const struct of_device_id *match;
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int irq_alarm;
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u8 data[RTC_DATA_LEN];
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int ret;
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if (!pdev->dev.of_node)
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return -ENXIO;
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match = of_match_node(da9063_compatible_reg_id_table,
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pdev->dev.of_node);
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rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
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if (!rtc)
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return -ENOMEM;
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rtc->config = match->data;
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if (of_device_is_compatible(pdev->dev.of_node, "dlg,da9063-rtc")) {
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struct da9063 *chip = dev_get_drvdata(pdev->dev.parent);
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if (chip->variant_code == PMIC_DA9063_AD)
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rtc->config = &da9063_ad_regs;
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}
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rtc->regmap = dev_get_regmap(pdev->dev.parent, NULL);
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if (!rtc->regmap) {
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dev_warn(&pdev->dev, "Parent regmap unavailable.\n");
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return -ENXIO;
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}
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config = rtc->config;
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ret = regmap_update_bits(rtc->regmap,
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config->rtc_enable_reg,
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config->rtc_enable_mask,
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config->rtc_enable_mask);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to enable RTC\n");
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return ret;
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}
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ret = regmap_update_bits(rtc->regmap,
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config->rtc_enable_32k_crystal_reg,
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config->rtc_crystal_mask,
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config->rtc_crystal_mask);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to run 32kHz oscillator\n");
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return ret;
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}
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ret = regmap_update_bits(rtc->regmap,
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config->rtc_alarm_secs_reg,
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config->rtc_alarm_status_mask,
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0);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = regmap_update_bits(rtc->regmap,
|
|
config->rtc_alarm_secs_reg,
|
|
DA9063_ALARM_STATUS_ALARM,
|
|
DA9063_ALARM_STATUS_ALARM);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Failed to access RTC alarm register\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = regmap_update_bits(rtc->regmap,
|
|
config->rtc_alarm_year_reg,
|
|
config->rtc_tick_on_mask,
|
|
0);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Failed to disable TICKs\n");
|
|
return ret;
|
|
}
|
|
|
|
data[RTC_SEC] = 0;
|
|
ret = regmap_bulk_read(rtc->regmap,
|
|
config->rtc_alarm_secs_reg,
|
|
&data[config->rtc_data_start],
|
|
config->rtc_alarm_len);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "Failed to read initial alarm data: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, rtc);
|
|
|
|
rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
|
|
if (IS_ERR(rtc->rtc_dev))
|
|
return PTR_ERR(rtc->rtc_dev);
|
|
|
|
rtc->rtc_dev->ops = &da9063_rtc_ops;
|
|
rtc->rtc_dev->range_min = RTC_TIMESTAMP_BEGIN_2000;
|
|
rtc->rtc_dev->range_max = RTC_TIMESTAMP_END_2063;
|
|
|
|
da9063_data_to_tm(data, &rtc->alarm_time, rtc);
|
|
rtc->rtc_sync = false;
|
|
|
|
if (config->rtc_data_start != RTC_SEC) {
|
|
set_bit(RTC_FEATURE_ALARM_RES_MINUTE, rtc->rtc_dev->features);
|
|
/*
|
|
* TODO: some models have alarms on a minute boundary but still
|
|
* support real hardware interrupts.
|
|
*/
|
|
clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->rtc_dev->features);
|
|
}
|
|
|
|
irq_alarm = platform_get_irq_byname(pdev, "ALARM");
|
|
if (irq_alarm < 0)
|
|
return irq_alarm;
|
|
|
|
ret = devm_request_threaded_irq(&pdev->dev, irq_alarm, NULL,
|
|
da9063_alarm_event,
|
|
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
|
|
"ALARM", rtc);
|
|
if (ret)
|
|
dev_err(&pdev->dev, "Failed to request ALARM IRQ %d: %d\n",
|
|
irq_alarm, ret);
|
|
|
|
ret = dev_pm_set_wake_irq(&pdev->dev, irq_alarm);
|
|
if (ret)
|
|
dev_warn(&pdev->dev,
|
|
"Failed to set IRQ %d as a wake IRQ: %d\n",
|
|
irq_alarm, ret);
|
|
|
|
device_init_wakeup(&pdev->dev, true);
|
|
|
|
return devm_rtc_register_device(rtc->rtc_dev);
|
|
}
|
|
|
|
static struct platform_driver da9063_rtc_driver = {
|
|
.probe = da9063_rtc_probe,
|
|
.driver = {
|
|
.name = DA9063_DRVNAME_RTC,
|
|
.of_match_table = da9063_compatible_reg_id_table,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(da9063_rtc_driver);
|
|
|
|
MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
|
|
MODULE_DESCRIPTION("Real time clock device driver for Dialog DA9063");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:" DA9063_DRVNAME_RTC);
|