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363 lines
9.5 KiB
363 lines
9.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* rtc-palmas.c -- Palmas Real Time Clock driver. |
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* RTC driver for TI Palma series devices like TPS65913, |
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* TPS65914 power management IC. |
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* |
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* Copyright (c) 2012, NVIDIA Corporation. |
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* |
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* Author: Laxman Dewangan <[email protected]> |
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*/ |
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#include <linux/bcd.h> |
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#include <linux/errno.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/mfd/palmas.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/rtc.h> |
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#include <linux/types.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm.h> |
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struct palmas_rtc { |
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struct rtc_device *rtc; |
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struct device *dev; |
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unsigned int irq; |
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}; |
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/* Total number of RTC registers needed to set time*/ |
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#define PALMAS_NUM_TIME_REGS (PALMAS_YEARS_REG - PALMAS_SECONDS_REG + 1) |
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static int palmas_rtc_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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unsigned char rtc_data[PALMAS_NUM_TIME_REGS]; |
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struct palmas *palmas = dev_get_drvdata(dev->parent); |
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int ret; |
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/* Copy RTC counting registers to static registers or latches */ |
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ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG, |
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PALMAS_RTC_CTRL_REG_GET_TIME, PALMAS_RTC_CTRL_REG_GET_TIME); |
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if (ret < 0) { |
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dev_err(dev, "RTC CTRL reg update failed, err: %d\n", ret); |
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return ret; |
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} |
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ret = palmas_bulk_read(palmas, PALMAS_RTC_BASE, PALMAS_SECONDS_REG, |
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rtc_data, PALMAS_NUM_TIME_REGS); |
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if (ret < 0) { |
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dev_err(dev, "RTC_SECONDS reg read failed, err = %d\n", ret); |
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return ret; |
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} |
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tm->tm_sec = bcd2bin(rtc_data[0]); |
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tm->tm_min = bcd2bin(rtc_data[1]); |
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tm->tm_hour = bcd2bin(rtc_data[2]); |
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tm->tm_mday = bcd2bin(rtc_data[3]); |
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tm->tm_mon = bcd2bin(rtc_data[4]) - 1; |
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tm->tm_year = bcd2bin(rtc_data[5]) + 100; |
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return ret; |
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} |
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static int palmas_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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unsigned char rtc_data[PALMAS_NUM_TIME_REGS]; |
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struct palmas *palmas = dev_get_drvdata(dev->parent); |
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int ret; |
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rtc_data[0] = bin2bcd(tm->tm_sec); |
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rtc_data[1] = bin2bcd(tm->tm_min); |
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rtc_data[2] = bin2bcd(tm->tm_hour); |
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rtc_data[3] = bin2bcd(tm->tm_mday); |
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rtc_data[4] = bin2bcd(tm->tm_mon + 1); |
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rtc_data[5] = bin2bcd(tm->tm_year - 100); |
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/* Stop RTC while updating the RTC time registers */ |
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ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG, |
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PALMAS_RTC_CTRL_REG_STOP_RTC, 0); |
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if (ret < 0) { |
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dev_err(dev, "RTC stop failed, err = %d\n", ret); |
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return ret; |
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} |
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ret = palmas_bulk_write(palmas, PALMAS_RTC_BASE, PALMAS_SECONDS_REG, |
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rtc_data, PALMAS_NUM_TIME_REGS); |
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if (ret < 0) { |
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dev_err(dev, "RTC_SECONDS reg write failed, err = %d\n", ret); |
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return ret; |
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} |
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/* Start back RTC */ |
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ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG, |
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PALMAS_RTC_CTRL_REG_STOP_RTC, PALMAS_RTC_CTRL_REG_STOP_RTC); |
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if (ret < 0) |
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dev_err(dev, "RTC start failed, err = %d\n", ret); |
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return ret; |
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} |
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static int palmas_rtc_alarm_irq_enable(struct device *dev, unsigned enabled) |
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{ |
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struct palmas *palmas = dev_get_drvdata(dev->parent); |
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u8 val; |
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val = enabled ? PALMAS_RTC_INTERRUPTS_REG_IT_ALARM : 0; |
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return palmas_write(palmas, PALMAS_RTC_BASE, |
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PALMAS_RTC_INTERRUPTS_REG, val); |
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} |
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static int palmas_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) |
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{ |
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unsigned char alarm_data[PALMAS_NUM_TIME_REGS]; |
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u32 int_val; |
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struct palmas *palmas = dev_get_drvdata(dev->parent); |
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int ret; |
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ret = palmas_bulk_read(palmas, PALMAS_RTC_BASE, |
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PALMAS_ALARM_SECONDS_REG, |
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alarm_data, PALMAS_NUM_TIME_REGS); |
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if (ret < 0) { |
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dev_err(dev, "RTC_ALARM_SECONDS read failed, err = %d\n", ret); |
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return ret; |
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} |
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alm->time.tm_sec = bcd2bin(alarm_data[0]); |
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alm->time.tm_min = bcd2bin(alarm_data[1]); |
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alm->time.tm_hour = bcd2bin(alarm_data[2]); |
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alm->time.tm_mday = bcd2bin(alarm_data[3]); |
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alm->time.tm_mon = bcd2bin(alarm_data[4]) - 1; |
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alm->time.tm_year = bcd2bin(alarm_data[5]) + 100; |
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ret = palmas_read(palmas, PALMAS_RTC_BASE, PALMAS_RTC_INTERRUPTS_REG, |
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&int_val); |
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if (ret < 0) { |
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dev_err(dev, "RTC_INTERRUPTS reg read failed, err = %d\n", ret); |
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return ret; |
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} |
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if (int_val & PALMAS_RTC_INTERRUPTS_REG_IT_ALARM) |
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alm->enabled = 1; |
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return ret; |
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} |
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static int palmas_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) |
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{ |
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unsigned char alarm_data[PALMAS_NUM_TIME_REGS]; |
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struct palmas *palmas = dev_get_drvdata(dev->parent); |
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int ret; |
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ret = palmas_rtc_alarm_irq_enable(dev, 0); |
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if (ret < 0) { |
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dev_err(dev, "Disable RTC alarm failed\n"); |
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return ret; |
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} |
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alarm_data[0] = bin2bcd(alm->time.tm_sec); |
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alarm_data[1] = bin2bcd(alm->time.tm_min); |
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alarm_data[2] = bin2bcd(alm->time.tm_hour); |
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alarm_data[3] = bin2bcd(alm->time.tm_mday); |
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alarm_data[4] = bin2bcd(alm->time.tm_mon + 1); |
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alarm_data[5] = bin2bcd(alm->time.tm_year - 100); |
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ret = palmas_bulk_write(palmas, PALMAS_RTC_BASE, |
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PALMAS_ALARM_SECONDS_REG, alarm_data, PALMAS_NUM_TIME_REGS); |
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if (ret < 0) { |
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dev_err(dev, "ALARM_SECONDS_REG write failed, err = %d\n", ret); |
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return ret; |
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} |
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if (alm->enabled) |
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ret = palmas_rtc_alarm_irq_enable(dev, 1); |
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return ret; |
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} |
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static int palmas_clear_interrupts(struct device *dev) |
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{ |
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struct palmas *palmas = dev_get_drvdata(dev->parent); |
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unsigned int rtc_reg; |
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int ret; |
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ret = palmas_read(palmas, PALMAS_RTC_BASE, PALMAS_RTC_STATUS_REG, |
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&rtc_reg); |
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if (ret < 0) { |
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dev_err(dev, "RTC_STATUS read failed, err = %d\n", ret); |
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return ret; |
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} |
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ret = palmas_write(palmas, PALMAS_RTC_BASE, PALMAS_RTC_STATUS_REG, |
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rtc_reg); |
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if (ret < 0) { |
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dev_err(dev, "RTC_STATUS write failed, err = %d\n", ret); |
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return ret; |
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} |
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return 0; |
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} |
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static irqreturn_t palmas_rtc_interrupt(int irq, void *context) |
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{ |
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struct palmas_rtc *palmas_rtc = context; |
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struct device *dev = palmas_rtc->dev; |
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int ret; |
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ret = palmas_clear_interrupts(dev); |
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if (ret < 0) { |
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dev_err(dev, "RTC interrupt clear failed, err = %d\n", ret); |
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return IRQ_NONE; |
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} |
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rtc_update_irq(palmas_rtc->rtc, 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 palmas_rtc_ops = { |
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.read_time = palmas_rtc_read_time, |
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.set_time = palmas_rtc_set_time, |
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.read_alarm = palmas_rtc_read_alarm, |
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.set_alarm = palmas_rtc_set_alarm, |
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.alarm_irq_enable = palmas_rtc_alarm_irq_enable, |
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}; |
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static int palmas_rtc_probe(struct platform_device *pdev) |
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{ |
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struct palmas *palmas = dev_get_drvdata(pdev->dev.parent); |
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struct palmas_rtc *palmas_rtc = NULL; |
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int ret; |
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bool enable_bb_charging = false; |
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bool high_bb_charging = false; |
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if (pdev->dev.of_node) { |
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enable_bb_charging = of_property_read_bool(pdev->dev.of_node, |
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"ti,backup-battery-chargeable"); |
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high_bb_charging = of_property_read_bool(pdev->dev.of_node, |
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"ti,backup-battery-charge-high-current"); |
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} |
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palmas_rtc = devm_kzalloc(&pdev->dev, sizeof(struct palmas_rtc), |
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GFP_KERNEL); |
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if (!palmas_rtc) |
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return -ENOMEM; |
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/* Clear pending interrupts */ |
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ret = palmas_clear_interrupts(&pdev->dev); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "clear RTC int failed, err = %d\n", ret); |
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return ret; |
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} |
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palmas_rtc->dev = &pdev->dev; |
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platform_set_drvdata(pdev, palmas_rtc); |
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if (enable_bb_charging) { |
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unsigned reg = PALMAS_BACKUP_BATTERY_CTRL_BBS_BBC_LOW_ICHRG; |
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if (high_bb_charging) |
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reg = 0; |
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ret = palmas_update_bits(palmas, PALMAS_PMU_CONTROL_BASE, |
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PALMAS_BACKUP_BATTERY_CTRL, |
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PALMAS_BACKUP_BATTERY_CTRL_BBS_BBC_LOW_ICHRG, reg); |
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if (ret < 0) { |
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dev_err(&pdev->dev, |
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"BACKUP_BATTERY_CTRL update failed, %d\n", ret); |
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return ret; |
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} |
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ret = palmas_update_bits(palmas, PALMAS_PMU_CONTROL_BASE, |
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PALMAS_BACKUP_BATTERY_CTRL, |
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PALMAS_BACKUP_BATTERY_CTRL_BB_CHG_EN, |
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PALMAS_BACKUP_BATTERY_CTRL_BB_CHG_EN); |
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if (ret < 0) { |
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dev_err(&pdev->dev, |
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"BACKUP_BATTERY_CTRL update failed, %d\n", ret); |
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return ret; |
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} |
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} |
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/* Start RTC */ |
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ret = palmas_update_bits(palmas, PALMAS_RTC_BASE, PALMAS_RTC_CTRL_REG, |
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PALMAS_RTC_CTRL_REG_STOP_RTC, |
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PALMAS_RTC_CTRL_REG_STOP_RTC); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "RTC_CTRL write failed, err = %d\n", ret); |
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return ret; |
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} |
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palmas_rtc->irq = platform_get_irq(pdev, 0); |
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device_init_wakeup(&pdev->dev, 1); |
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palmas_rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name, |
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&palmas_rtc_ops, THIS_MODULE); |
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if (IS_ERR(palmas_rtc->rtc)) { |
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ret = PTR_ERR(palmas_rtc->rtc); |
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dev_err(&pdev->dev, "RTC register failed, err = %d\n", ret); |
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return ret; |
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} |
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ret = devm_request_threaded_irq(&pdev->dev, palmas_rtc->irq, NULL, |
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palmas_rtc_interrupt, |
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IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
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dev_name(&pdev->dev), palmas_rtc); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "IRQ request failed, err = %d\n", ret); |
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return ret; |
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} |
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return 0; |
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} |
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static int palmas_rtc_remove(struct platform_device *pdev) |
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{ |
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palmas_rtc_alarm_irq_enable(&pdev->dev, 0); |
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return 0; |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int palmas_rtc_suspend(struct device *dev) |
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{ |
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struct palmas_rtc *palmas_rtc = dev_get_drvdata(dev); |
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if (device_may_wakeup(dev)) |
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enable_irq_wake(palmas_rtc->irq); |
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return 0; |
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} |
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static int palmas_rtc_resume(struct device *dev) |
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{ |
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struct palmas_rtc *palmas_rtc = dev_get_drvdata(dev); |
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if (device_may_wakeup(dev)) |
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disable_irq_wake(palmas_rtc->irq); |
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return 0; |
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} |
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#endif |
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static SIMPLE_DEV_PM_OPS(palmas_rtc_pm_ops, palmas_rtc_suspend, |
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palmas_rtc_resume); |
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#ifdef CONFIG_OF |
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static const struct of_device_id of_palmas_rtc_match[] = { |
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{ .compatible = "ti,palmas-rtc"}, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, of_palmas_rtc_match); |
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#endif |
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static struct platform_driver palmas_rtc_driver = { |
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.probe = palmas_rtc_probe, |
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.remove = palmas_rtc_remove, |
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.driver = { |
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.name = "palmas-rtc", |
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.pm = &palmas_rtc_pm_ops, |
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.of_match_table = of_match_ptr(of_palmas_rtc_match), |
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}, |
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}; |
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module_platform_driver(palmas_rtc_driver); |
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MODULE_ALIAS("platform:palmas_rtc"); |
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MODULE_DESCRIPTION("TI PALMAS series RTC driver"); |
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MODULE_AUTHOR("Laxman Dewangan <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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