+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * rtc-tps80031.c -- TI TPS80031/TPS80032 RTC driver
- *
- * RTC driver for TI TPS80031/TPS80032 Fully Integrated
- * Power Management with Power Path and Battery Charger
- *
- * Copyright (c) 2012, NVIDIA Corporation.
- *
- * Author: Laxman Dewangan <ldewangan@nvidia.com>
- */
-
-#include <linux/bcd.h>
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/mfd/tps80031.h>
-#include <linux/platform_device.h>
-#include <linux/pm.h>
-#include <linux/rtc.h>
-#include <linux/slab.h>
-
-#define ENABLE_ALARM_INT 0x08
-#define ALARM_INT_STATUS 0x40
-
-/**
- * Setting bit to 1 in STOP_RTC will run the RTC and
- * setting this bit to 0 will freeze RTC.
- */
-#define STOP_RTC 0x1
-
-/* Power on reset Values of RTC registers */
-#define TPS80031_RTC_POR_YEAR 0
-#define TPS80031_RTC_POR_MONTH 1
-#define TPS80031_RTC_POR_DAY 1
-
-/* Numbers of registers for time and alarms */
-#define TPS80031_RTC_TIME_NUM_REGS 7
-#define TPS80031_RTC_ALARM_NUM_REGS 6
-
-/**
- * PMU RTC have only 2 nibbles to store year information, so using an
- * offset of 100 to set the base year as 2000 for our driver.
- */
-#define RTC_YEAR_OFFSET 100
-
-struct tps80031_rtc {
- struct rtc_device *rtc;
- int irq;
-};
-
-static int tps80031_rtc_read_time(struct device *dev, struct rtc_time *tm)
-{
- u8 buff[TPS80031_RTC_TIME_NUM_REGS];
- int ret;
-
- ret = tps80031_reads(dev->parent, TPS80031_SLAVE_ID1,
- TPS80031_SECONDS_REG, TPS80031_RTC_TIME_NUM_REGS, buff);
- if (ret < 0) {
- dev_err(dev, "reading RTC_SECONDS_REG failed, err = %d\n", ret);
- return ret;
- }
-
- tm->tm_sec = bcd2bin(buff[0]);
- tm->tm_min = bcd2bin(buff[1]);
- tm->tm_hour = bcd2bin(buff[2]);
- tm->tm_mday = bcd2bin(buff[3]);
- tm->tm_mon = bcd2bin(buff[4]) - 1;
- tm->tm_year = bcd2bin(buff[5]) + RTC_YEAR_OFFSET;
- tm->tm_wday = bcd2bin(buff[6]);
- return 0;
-}
-
-static int tps80031_rtc_set_time(struct device *dev, struct rtc_time *tm)
-{
- u8 buff[7];
- int ret;
-
- buff[0] = bin2bcd(tm->tm_sec);
- buff[1] = bin2bcd(tm->tm_min);
- buff[2] = bin2bcd(tm->tm_hour);
- buff[3] = bin2bcd(tm->tm_mday);
- buff[4] = bin2bcd(tm->tm_mon + 1);
- buff[5] = bin2bcd(tm->tm_year % RTC_YEAR_OFFSET);
- buff[6] = bin2bcd(tm->tm_wday);
-
- /* Stop RTC while updating the RTC time registers */
- ret = tps80031_clr_bits(dev->parent, TPS80031_SLAVE_ID1,
- TPS80031_RTC_CTRL_REG, STOP_RTC);
- if (ret < 0) {
- dev_err(dev->parent, "Stop RTC failed, err = %d\n", ret);
- return ret;
- }
-
- ret = tps80031_writes(dev->parent, TPS80031_SLAVE_ID1,
- TPS80031_SECONDS_REG,
- TPS80031_RTC_TIME_NUM_REGS, buff);
- if (ret < 0) {
- dev_err(dev, "writing RTC_SECONDS_REG failed, err %d\n", ret);
- return ret;
- }
-
- ret = tps80031_set_bits(dev->parent, TPS80031_SLAVE_ID1,
- TPS80031_RTC_CTRL_REG, STOP_RTC);
- if (ret < 0)
- dev_err(dev->parent, "Start RTC failed, err = %d\n", ret);
- return ret;
-}
-
-static int tps80031_rtc_alarm_irq_enable(struct device *dev,
- unsigned int enable)
-{
- int ret;
-
- if (enable)
- ret = tps80031_set_bits(dev->parent, TPS80031_SLAVE_ID1,
- TPS80031_RTC_INTERRUPTS_REG, ENABLE_ALARM_INT);
- else
- ret = tps80031_clr_bits(dev->parent, TPS80031_SLAVE_ID1,
- TPS80031_RTC_INTERRUPTS_REG, ENABLE_ALARM_INT);
- if (ret < 0) {
- dev_err(dev, "Update on RTC_INT failed, err = %d\n", ret);
- return ret;
- }
- return 0;
-}
-
-static int tps80031_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
-{
- u8 buff[TPS80031_RTC_ALARM_NUM_REGS];
- int ret;
-
- buff[0] = bin2bcd(alrm->time.tm_sec);
- buff[1] = bin2bcd(alrm->time.tm_min);
- buff[2] = bin2bcd(alrm->time.tm_hour);
- buff[3] = bin2bcd(alrm->time.tm_mday);
- buff[4] = bin2bcd(alrm->time.tm_mon + 1);
- buff[5] = bin2bcd(alrm->time.tm_year % RTC_YEAR_OFFSET);
- ret = tps80031_writes(dev->parent, TPS80031_SLAVE_ID1,
- TPS80031_ALARM_SECONDS_REG,
- TPS80031_RTC_ALARM_NUM_REGS, buff);
- if (ret < 0) {
- dev_err(dev, "Writing RTC_ALARM failed, err %d\n", ret);
- return ret;
- }
- return tps80031_rtc_alarm_irq_enable(dev, alrm->enabled);
-}
-
-static int tps80031_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
-{
- u8 buff[6];
- int ret;
-
- ret = tps80031_reads(dev->parent, TPS80031_SLAVE_ID1,
- TPS80031_ALARM_SECONDS_REG,
- TPS80031_RTC_ALARM_NUM_REGS, buff);
- if (ret < 0) {
- dev_err(dev->parent,
- "reading RTC_ALARM failed, err = %d\n", ret);
- return ret;
- }
-
- alrm->time.tm_sec = bcd2bin(buff[0]);
- alrm->time.tm_min = bcd2bin(buff[1]);
- alrm->time.tm_hour = bcd2bin(buff[2]);
- alrm->time.tm_mday = bcd2bin(buff[3]);
- alrm->time.tm_mon = bcd2bin(buff[4]) - 1;
- alrm->time.tm_year = bcd2bin(buff[5]) + RTC_YEAR_OFFSET;
- return 0;
-}
-
-static int clear_alarm_int_status(struct device *dev, struct tps80031_rtc *rtc)
-{
- int ret;
- u8 buf;
-
- /**
- * As per datasheet, A dummy read of this RTC_STATUS_REG register
- * is necessary before each I2C read in order to update the status
- * register value.
- */
- ret = tps80031_read(dev->parent, TPS80031_SLAVE_ID1,
- TPS80031_RTC_STATUS_REG, &buf);
- if (ret < 0) {
- dev_err(dev, "reading RTC_STATUS failed. err = %d\n", ret);
- return ret;
- }
-
- /* clear Alarm status bits.*/
- ret = tps80031_set_bits(dev->parent, TPS80031_SLAVE_ID1,
- TPS80031_RTC_STATUS_REG, ALARM_INT_STATUS);
- if (ret < 0) {
- dev_err(dev, "clear Alarm INT failed, err = %d\n", ret);
- return ret;
- }
- return 0;
-}
-
-static irqreturn_t tps80031_rtc_irq(int irq, void *data)
-{
- struct device *dev = data;
- struct tps80031_rtc *rtc = dev_get_drvdata(dev);
- int ret;
-
- ret = clear_alarm_int_status(dev, rtc);
- if (ret < 0)
- return ret;
-
- rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
- return IRQ_HANDLED;
-}
-
-static const struct rtc_class_ops tps80031_rtc_ops = {
- .read_time = tps80031_rtc_read_time,
- .set_time = tps80031_rtc_set_time,
- .set_alarm = tps80031_rtc_set_alarm,
- .read_alarm = tps80031_rtc_read_alarm,
- .alarm_irq_enable = tps80031_rtc_alarm_irq_enable,
-};
-
-static int tps80031_rtc_probe(struct platform_device *pdev)
-{
- struct tps80031_rtc *rtc;
- struct rtc_time tm;
- int ret;
-
- rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
- if (!rtc)
- return -ENOMEM;
-
- rtc->irq = platform_get_irq(pdev, 0);
- platform_set_drvdata(pdev, rtc);
-
- /* Start RTC */
- ret = tps80031_set_bits(pdev->dev.parent, TPS80031_SLAVE_ID1,
- TPS80031_RTC_CTRL_REG, STOP_RTC);
- if (ret < 0) {
- dev_err(&pdev->dev, "failed to start RTC. err = %d\n", ret);
- return ret;
- }
-
- /* If RTC have POR values, set time 01:01:2000 */
- tps80031_rtc_read_time(&pdev->dev, &tm);
- if ((tm.tm_year == RTC_YEAR_OFFSET + TPS80031_RTC_POR_YEAR) &&
- (tm.tm_mon == (TPS80031_RTC_POR_MONTH - 1)) &&
- (tm.tm_mday == TPS80031_RTC_POR_DAY)) {
- tm.tm_year = 2000;
- tm.tm_mday = 1;
- tm.tm_mon = 1;
- ret = tps80031_rtc_set_time(&pdev->dev, &tm);
- if (ret < 0) {
- dev_err(&pdev->dev,
- "RTC set time failed, err = %d\n", ret);
- return ret;
- }
- }
-
- /* Clear alarm intretupt status if it is there */
- ret = clear_alarm_int_status(&pdev->dev, rtc);
- if (ret < 0) {
- dev_err(&pdev->dev, "Clear alarm int failed, err = %d\n", ret);
- return ret;
- }
-
- rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
- &tps80031_rtc_ops, THIS_MODULE);
- if (IS_ERR(rtc->rtc)) {
- ret = PTR_ERR(rtc->rtc);
- dev_err(&pdev->dev, "RTC registration failed, err %d\n", ret);
- return ret;
- }
-
- ret = devm_request_threaded_irq(&pdev->dev, rtc->irq, NULL,
- tps80031_rtc_irq,
- IRQF_ONESHOT,
- dev_name(&pdev->dev), rtc);
- if (ret < 0) {
- dev_err(&pdev->dev, "request IRQ:%d failed, err = %d\n",
- rtc->irq, ret);
- return ret;
- }
- device_set_wakeup_capable(&pdev->dev, 1);
- return 0;
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int tps80031_rtc_suspend(struct device *dev)
-{
- struct tps80031_rtc *rtc = dev_get_drvdata(dev);
-
- if (device_may_wakeup(dev))
- enable_irq_wake(rtc->irq);
- return 0;
-}
-
-static int tps80031_rtc_resume(struct device *dev)
-{
- struct tps80031_rtc *rtc = dev_get_drvdata(dev);
-
- if (device_may_wakeup(dev))
- disable_irq_wake(rtc->irq);
- return 0;
-};
-#endif
-
-static SIMPLE_DEV_PM_OPS(tps80031_pm_ops, tps80031_rtc_suspend,
- tps80031_rtc_resume);
-
-static struct platform_driver tps80031_rtc_driver = {
- .driver = {
- .name = "tps80031-rtc",
- .pm = &tps80031_pm_ops,
- },
- .probe = tps80031_rtc_probe,
-};
-
-module_platform_driver(tps80031_rtc_driver);
-
-MODULE_ALIAS("platform:tps80031-rtc");
-MODULE_DESCRIPTION("TI TPS80031/TPS80032 RTC driver");
-MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>");
-MODULE_LICENSE("GPL v2");
projects / platform / kernel / linux-starfive.git / commitdiff