2006-12-07 04:38:36 +00:00
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/*
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* TI OMAP1 Real Time Clock interface for Linux
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*
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* Copyright (C) 2003 MontaVista Software, Inc.
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* Author: George G. Davis <gdavis@mvista.com> or <source@mvista.com>
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*
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* Copyright (C) 2006 David Brownell (new RTC framework)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#include <linux/platform_device.h>
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2012-12-18 00:02:15 +00:00
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#include <linux/of.h>
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#include <linux/of_device.h>
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2012-12-18 00:02:18 +00:00
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#include <linux/pm_runtime.h>
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2013-07-03 22:06:00 +00:00
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#include <linux/io.h>
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2006-12-07 04:38:36 +00:00
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/* The OMAP1 RTC is a year/month/day/hours/minutes/seconds BCD clock
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* with century-range alarm matching, driven by the 32kHz clock.
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*
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* The main user-visible ways it differs from PC RTCs are by omitting
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* "don't care" alarm fields and sub-second periodic IRQs, and having
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* an autoadjust mechanism to calibrate to the true oscillator rate.
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*
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* Board-specific wiring options include using split power mode with
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* RTC_OFF_NOFF used as the reset signal (so the RTC won't be reset),
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* and wiring RTC_WAKE_INT (so the RTC alarm can wake the system from
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2010-10-27 22:33:05 +00:00
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* low power modes) for OMAP1 boards (OMAP-L138 has this built into
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* the SoC). See the BOARD-SPECIFIC CUSTOMIZATION comment.
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2006-12-07 04:38:36 +00:00
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*/
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/* RTC registers */
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#define OMAP_RTC_SECONDS_REG 0x00
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#define OMAP_RTC_MINUTES_REG 0x04
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#define OMAP_RTC_HOURS_REG 0x08
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#define OMAP_RTC_DAYS_REG 0x0C
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#define OMAP_RTC_MONTHS_REG 0x10
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#define OMAP_RTC_YEARS_REG 0x14
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#define OMAP_RTC_WEEKS_REG 0x18
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#define OMAP_RTC_ALARM_SECONDS_REG 0x20
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#define OMAP_RTC_ALARM_MINUTES_REG 0x24
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#define OMAP_RTC_ALARM_HOURS_REG 0x28
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#define OMAP_RTC_ALARM_DAYS_REG 0x2c
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#define OMAP_RTC_ALARM_MONTHS_REG 0x30
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#define OMAP_RTC_ALARM_YEARS_REG 0x34
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#define OMAP_RTC_CTRL_REG 0x40
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#define OMAP_RTC_STATUS_REG 0x44
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#define OMAP_RTC_INTERRUPTS_REG 0x48
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#define OMAP_RTC_COMP_LSB_REG 0x4c
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#define OMAP_RTC_COMP_MSB_REG 0x50
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#define OMAP_RTC_OSC_REG 0x54
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2012-12-18 00:02:11 +00:00
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#define OMAP_RTC_KICK0_REG 0x6c
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#define OMAP_RTC_KICK1_REG 0x70
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2013-09-11 21:24:18 +00:00
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#define OMAP_RTC_IRQWAKEEN 0x7c
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2006-12-07 04:38:36 +00:00
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/* OMAP_RTC_CTRL_REG bit fields: */
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2014-06-06 21:36:05 +00:00
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#define OMAP_RTC_CTRL_SPLIT BIT(7)
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#define OMAP_RTC_CTRL_DISABLE BIT(6)
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#define OMAP_RTC_CTRL_SET_32_COUNTER BIT(5)
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#define OMAP_RTC_CTRL_TEST BIT(4)
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#define OMAP_RTC_CTRL_MODE_12_24 BIT(3)
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#define OMAP_RTC_CTRL_AUTO_COMP BIT(2)
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#define OMAP_RTC_CTRL_ROUND_30S BIT(1)
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#define OMAP_RTC_CTRL_STOP BIT(0)
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2006-12-07 04:38:36 +00:00
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/* OMAP_RTC_STATUS_REG bit fields: */
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2014-06-06 21:36:05 +00:00
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#define OMAP_RTC_STATUS_POWER_UP BIT(7)
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#define OMAP_RTC_STATUS_ALARM BIT(6)
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#define OMAP_RTC_STATUS_1D_EVENT BIT(5)
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#define OMAP_RTC_STATUS_1H_EVENT BIT(4)
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#define OMAP_RTC_STATUS_1M_EVENT BIT(3)
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#define OMAP_RTC_STATUS_1S_EVENT BIT(2)
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#define OMAP_RTC_STATUS_RUN BIT(1)
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#define OMAP_RTC_STATUS_BUSY BIT(0)
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2006-12-07 04:38:36 +00:00
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/* OMAP_RTC_INTERRUPTS_REG bit fields: */
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2014-06-06 21:36:05 +00:00
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#define OMAP_RTC_INTERRUPTS_IT_ALARM BIT(3)
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#define OMAP_RTC_INTERRUPTS_IT_TIMER BIT(2)
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2006-12-07 04:38:36 +00:00
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2014-06-06 21:36:06 +00:00
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/* OMAP_RTC_OSC_REG bit fields: */
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#define OMAP_RTC_OSC_32KCLK_EN BIT(6)
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2013-09-11 21:24:18 +00:00
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/* OMAP_RTC_IRQWAKEEN bit fields: */
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2014-06-06 21:36:05 +00:00
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#define OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN BIT(1)
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2013-09-11 21:24:18 +00:00
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2012-12-18 00:02:11 +00:00
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/* OMAP_RTC_KICKER values */
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#define KICK0_VALUE 0x83e70b13
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#define KICK1_VALUE 0x95a4f1e0
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2014-12-10 23:53:01 +00:00
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struct omap_rtc_device_type {
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bool has_32kclk_en;
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bool has_kicker;
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bool has_irqwakeen;
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2014-12-10 23:53:04 +00:00
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bool has_power_up_reset;
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2014-12-10 23:53:01 +00:00
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};
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2014-06-06 21:36:06 +00:00
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2014-12-10 23:52:55 +00:00
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struct omap_rtc {
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struct rtc_device *rtc;
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void __iomem *base;
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int irq_alarm;
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int irq_timer;
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u8 interrupts_reg;
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2014-12-10 23:53:01 +00:00
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const struct omap_rtc_device_type *type;
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2014-12-10 23:52:55 +00:00
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};
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2006-12-07 04:38:36 +00:00
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2014-12-10 23:52:55 +00:00
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static inline u8 rtc_read(struct omap_rtc *rtc, unsigned int reg)
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{
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return readb(rtc->base + reg);
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}
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2012-12-18 00:02:11 +00:00
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2014-12-10 23:53:10 +00:00
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static inline u32 rtc_readl(struct omap_rtc *rtc, unsigned int reg)
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{
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return readl(rtc->base + reg);
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}
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2014-12-10 23:52:55 +00:00
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static inline void rtc_write(struct omap_rtc *rtc, unsigned int reg, u8 val)
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{
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writeb(val, rtc->base + reg);
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}
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2006-12-07 04:38:36 +00:00
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2014-12-10 23:52:55 +00:00
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static inline void rtc_writel(struct omap_rtc *rtc, unsigned int reg, u32 val)
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{
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writel(val, rtc->base + reg);
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}
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2006-12-07 04:38:36 +00:00
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/* we rely on the rtc framework to handle locking (rtc->ops_lock),
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* so the only other requirement is that register accesses which
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* require BUSY to be clear are made with IRQs locally disabled
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*/
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2014-12-10 23:52:55 +00:00
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static void rtc_wait_not_busy(struct omap_rtc *rtc)
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2006-12-07 04:38:36 +00:00
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{
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int count = 0;
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u8 status;
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/* BUSY may stay active for 1/32768 second (~30 usec) */
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for (count = 0; count < 50; count++) {
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2014-12-10 23:52:55 +00:00
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status = rtc_read(rtc, OMAP_RTC_STATUS_REG);
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2006-12-07 04:38:36 +00:00
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if ((status & (u8)OMAP_RTC_STATUS_BUSY) == 0)
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break;
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udelay(1);
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}
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/* now we have ~15 usec to read/write various registers */
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}
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2014-12-10 23:52:55 +00:00
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static irqreturn_t rtc_irq(int irq, void *dev_id)
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2006-12-07 04:38:36 +00:00
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{
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2014-12-10 23:52:55 +00:00
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struct omap_rtc *rtc = dev_id;
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2006-12-07 04:38:36 +00:00
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unsigned long events = 0;
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u8 irq_data;
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2014-12-10 23:52:55 +00:00
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irq_data = rtc_read(rtc, OMAP_RTC_STATUS_REG);
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2006-12-07 04:38:36 +00:00
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/* alarm irq? */
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if (irq_data & OMAP_RTC_STATUS_ALARM) {
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2014-12-10 23:52:55 +00:00
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rtc_write(rtc, OMAP_RTC_STATUS_REG, OMAP_RTC_STATUS_ALARM);
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2006-12-07 04:38:36 +00:00
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events |= RTC_IRQF | RTC_AF;
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}
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/* 1/sec periodic/update irq? */
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if (irq_data & OMAP_RTC_STATUS_1S_EVENT)
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events |= RTC_IRQF | RTC_UF;
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2014-12-10 23:52:55 +00:00
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rtc_update_irq(rtc->rtc, 1, events);
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2006-12-07 04:38:36 +00:00
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return IRQ_HANDLED;
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}
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2011-02-03 01:02:41 +00:00
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static int omap_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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2014-12-10 23:52:55 +00:00
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struct omap_rtc *rtc = dev_get_drvdata(dev);
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2014-06-06 21:36:12 +00:00
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u8 reg, irqwake_reg = 0;
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2011-02-03 01:02:41 +00:00
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local_irq_disable();
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2014-12-10 23:52:55 +00:00
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rtc_wait_not_busy(rtc);
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reg = rtc_read(rtc, OMAP_RTC_INTERRUPTS_REG);
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2014-12-10 23:53:01 +00:00
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if (rtc->type->has_irqwakeen)
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2014-12-10 23:52:55 +00:00
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irqwake_reg = rtc_read(rtc, OMAP_RTC_IRQWAKEEN);
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2014-06-06 21:36:12 +00:00
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if (enabled) {
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2011-02-03 01:02:41 +00:00
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reg |= OMAP_RTC_INTERRUPTS_IT_ALARM;
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2014-06-06 21:36:12 +00:00
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irqwake_reg |= OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN;
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} else {
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2011-02-03 01:02:41 +00:00
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reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM;
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2014-06-06 21:36:12 +00:00
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irqwake_reg &= ~OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN;
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}
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2014-12-10 23:52:55 +00:00
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rtc_wait_not_busy(rtc);
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rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, reg);
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2014-12-10 23:53:01 +00:00
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if (rtc->type->has_irqwakeen)
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2014-12-10 23:52:55 +00:00
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rtc_write(rtc, OMAP_RTC_IRQWAKEEN, irqwake_reg);
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2011-02-03 01:02:41 +00:00
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local_irq_enable();
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return 0;
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}
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2006-12-07 04:38:36 +00:00
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/* this hardware doesn't support "don't care" alarm fields */
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static int tm2bcd(struct rtc_time *tm)
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{
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if (rtc_valid_tm(tm) != 0)
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return -EINVAL;
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2008-10-19 03:28:41 +00:00
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tm->tm_sec = bin2bcd(tm->tm_sec);
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tm->tm_min = bin2bcd(tm->tm_min);
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tm->tm_hour = bin2bcd(tm->tm_hour);
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tm->tm_mday = bin2bcd(tm->tm_mday);
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2006-12-07 04:38:36 +00:00
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2008-10-19 03:28:41 +00:00
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tm->tm_mon = bin2bcd(tm->tm_mon + 1);
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2006-12-07 04:38:36 +00:00
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/* epoch == 1900 */
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if (tm->tm_year < 100 || tm->tm_year > 199)
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return -EINVAL;
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2008-10-19 03:28:41 +00:00
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tm->tm_year = bin2bcd(tm->tm_year - 100);
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2006-12-07 04:38:36 +00:00
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return 0;
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}
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static void bcd2tm(struct rtc_time *tm)
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{
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2008-10-19 03:28:41 +00:00
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tm->tm_sec = bcd2bin(tm->tm_sec);
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tm->tm_min = bcd2bin(tm->tm_min);
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tm->tm_hour = bcd2bin(tm->tm_hour);
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tm->tm_mday = bcd2bin(tm->tm_mday);
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tm->tm_mon = bcd2bin(tm->tm_mon) - 1;
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2006-12-07 04:38:36 +00:00
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/* epoch == 1900 */
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2008-10-19 03:28:41 +00:00
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tm->tm_year = bcd2bin(tm->tm_year) + 100;
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2006-12-07 04:38:36 +00:00
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}
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2014-12-10 23:53:07 +00:00
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static void omap_rtc_read_time_raw(struct omap_rtc *rtc, struct rtc_time *tm)
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2006-12-07 04:38:36 +00:00
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{
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2014-12-10 23:52:55 +00:00
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tm->tm_sec = rtc_read(rtc, OMAP_RTC_SECONDS_REG);
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tm->tm_min = rtc_read(rtc, OMAP_RTC_MINUTES_REG);
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tm->tm_hour = rtc_read(rtc, OMAP_RTC_HOURS_REG);
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tm->tm_mday = rtc_read(rtc, OMAP_RTC_DAYS_REG);
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tm->tm_mon = rtc_read(rtc, OMAP_RTC_MONTHS_REG);
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tm->tm_year = rtc_read(rtc, OMAP_RTC_YEARS_REG);
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2014-12-10 23:53:07 +00:00
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}
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static int omap_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct omap_rtc *rtc = dev_get_drvdata(dev);
|
2006-12-07 04:38:36 +00:00
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2014-12-10 23:53:07 +00:00
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/* we don't report wday/yday/isdst ... */
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local_irq_disable();
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rtc_wait_not_busy(rtc);
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omap_rtc_read_time_raw(rtc, tm);
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2006-12-07 04:38:36 +00:00
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local_irq_enable();
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bcd2tm(tm);
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return 0;
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}
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static int omap_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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2014-12-10 23:52:55 +00:00
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struct omap_rtc *rtc = dev_get_drvdata(dev);
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2006-12-07 04:38:36 +00:00
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if (tm2bcd(tm) < 0)
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return -EINVAL;
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local_irq_disable();
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2014-12-10 23:52:55 +00:00
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rtc_wait_not_busy(rtc);
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2006-12-07 04:38:36 +00:00
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2014-12-10 23:52:55 +00:00
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rtc_write(rtc, OMAP_RTC_YEARS_REG, tm->tm_year);
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rtc_write(rtc, OMAP_RTC_MONTHS_REG, tm->tm_mon);
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rtc_write(rtc, OMAP_RTC_DAYS_REG, tm->tm_mday);
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rtc_write(rtc, OMAP_RTC_HOURS_REG, tm->tm_hour);
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rtc_write(rtc, OMAP_RTC_MINUTES_REG, tm->tm_min);
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rtc_write(rtc, OMAP_RTC_SECONDS_REG, tm->tm_sec);
|
2006-12-07 04:38:36 +00:00
|
|
|
|
|
|
|
local_irq_enable();
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int omap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
|
|
|
|
{
|
2014-12-10 23:52:55 +00:00
|
|
|
struct omap_rtc *rtc = dev_get_drvdata(dev);
|
|
|
|
|
2006-12-07 04:38:36 +00:00
|
|
|
local_irq_disable();
|
2014-12-10 23:52:55 +00:00
|
|
|
rtc_wait_not_busy(rtc);
|
2006-12-07 04:38:36 +00:00
|
|
|
|
2014-12-10 23:52:55 +00:00
|
|
|
alm->time.tm_sec = rtc_read(rtc, OMAP_RTC_ALARM_SECONDS_REG);
|
|
|
|
alm->time.tm_min = rtc_read(rtc, OMAP_RTC_ALARM_MINUTES_REG);
|
|
|
|
alm->time.tm_hour = rtc_read(rtc, OMAP_RTC_ALARM_HOURS_REG);
|
|
|
|
alm->time.tm_mday = rtc_read(rtc, OMAP_RTC_ALARM_DAYS_REG);
|
|
|
|
alm->time.tm_mon = rtc_read(rtc, OMAP_RTC_ALARM_MONTHS_REG);
|
|
|
|
alm->time.tm_year = rtc_read(rtc, OMAP_RTC_ALARM_YEARS_REG);
|
2006-12-07 04:38:36 +00:00
|
|
|
|
|
|
|
local_irq_enable();
|
|
|
|
|
|
|
|
bcd2tm(&alm->time);
|
2014-12-10 23:52:55 +00:00
|
|
|
alm->enabled = !!(rtc_read(rtc, OMAP_RTC_INTERRUPTS_REG)
|
2006-12-07 04:38:36 +00:00
|
|
|
& OMAP_RTC_INTERRUPTS_IT_ALARM);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int omap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
|
|
|
|
{
|
2014-12-10 23:52:55 +00:00
|
|
|
struct omap_rtc *rtc = dev_get_drvdata(dev);
|
2014-06-06 21:36:12 +00:00
|
|
|
u8 reg, irqwake_reg = 0;
|
2006-12-07 04:38:36 +00:00
|
|
|
|
|
|
|
if (tm2bcd(&alm->time) < 0)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
local_irq_disable();
|
2014-12-10 23:52:55 +00:00
|
|
|
rtc_wait_not_busy(rtc);
|
2006-12-07 04:38:36 +00:00
|
|
|
|
2014-12-10 23:52:55 +00:00
|
|
|
rtc_write(rtc, OMAP_RTC_ALARM_YEARS_REG, alm->time.tm_year);
|
|
|
|
rtc_write(rtc, OMAP_RTC_ALARM_MONTHS_REG, alm->time.tm_mon);
|
|
|
|
rtc_write(rtc, OMAP_RTC_ALARM_DAYS_REG, alm->time.tm_mday);
|
|
|
|
rtc_write(rtc, OMAP_RTC_ALARM_HOURS_REG, alm->time.tm_hour);
|
|
|
|
rtc_write(rtc, OMAP_RTC_ALARM_MINUTES_REG, alm->time.tm_min);
|
|
|
|
rtc_write(rtc, OMAP_RTC_ALARM_SECONDS_REG, alm->time.tm_sec);
|
2006-12-07 04:38:36 +00:00
|
|
|
|
2014-12-10 23:52:55 +00:00
|
|
|
reg = rtc_read(rtc, OMAP_RTC_INTERRUPTS_REG);
|
2014-12-10 23:53:01 +00:00
|
|
|
if (rtc->type->has_irqwakeen)
|
2014-12-10 23:52:55 +00:00
|
|
|
irqwake_reg = rtc_read(rtc, OMAP_RTC_IRQWAKEEN);
|
2014-06-06 21:36:12 +00:00
|
|
|
|
|
|
|
if (alm->enabled) {
|
2006-12-07 04:38:36 +00:00
|
|
|
reg |= OMAP_RTC_INTERRUPTS_IT_ALARM;
|
2014-06-06 21:36:12 +00:00
|
|
|
irqwake_reg |= OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN;
|
|
|
|
} else {
|
2006-12-07 04:38:36 +00:00
|
|
|
reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM;
|
2014-06-06 21:36:12 +00:00
|
|
|
irqwake_reg &= ~OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN;
|
|
|
|
}
|
2014-12-10 23:52:55 +00:00
|
|
|
rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, reg);
|
2014-12-10 23:53:01 +00:00
|
|
|
if (rtc->type->has_irqwakeen)
|
2014-12-10 23:52:55 +00:00
|
|
|
rtc_write(rtc, OMAP_RTC_IRQWAKEEN, irqwake_reg);
|
2006-12-07 04:38:36 +00:00
|
|
|
|
|
|
|
local_irq_enable();
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct rtc_class_ops omap_rtc_ops = {
|
|
|
|
.read_time = omap_rtc_read_time,
|
|
|
|
.set_time = omap_rtc_set_time,
|
|
|
|
.read_alarm = omap_rtc_read_alarm,
|
|
|
|
.set_alarm = omap_rtc_set_alarm,
|
2011-02-03 01:02:41 +00:00
|
|
|
.alarm_irq_enable = omap_rtc_alarm_irq_enable,
|
2006-12-07 04:38:36 +00:00
|
|
|
};
|
|
|
|
|
2014-12-10 23:53:01 +00:00
|
|
|
static const struct omap_rtc_device_type omap_rtc_default_type = {
|
2014-12-10 23:53:04 +00:00
|
|
|
.has_power_up_reset = true,
|
2014-12-10 23:53:01 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
static const struct omap_rtc_device_type omap_rtc_am3352_type = {
|
|
|
|
.has_32kclk_en = true,
|
|
|
|
.has_kicker = true,
|
|
|
|
.has_irqwakeen = true,
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct omap_rtc_device_type omap_rtc_da830_type = {
|
|
|
|
.has_kicker = true,
|
|
|
|
};
|
2012-12-18 00:02:15 +00:00
|
|
|
|
2014-12-10 23:53:01 +00:00
|
|
|
static const struct platform_device_id omap_rtc_id_table[] = {
|
2012-12-18 00:02:11 +00:00
|
|
|
{
|
2014-12-10 23:52:58 +00:00
|
|
|
.name = "omap_rtc",
|
2014-12-10 23:53:01 +00:00
|
|
|
.driver_data = (kernel_ulong_t)&omap_rtc_default_type,
|
|
|
|
}, {
|
2013-09-11 21:24:18 +00:00
|
|
|
.name = "am3352-rtc",
|
2014-12-10 23:53:01 +00:00
|
|
|
.driver_data = (kernel_ulong_t)&omap_rtc_am3352_type,
|
|
|
|
}, {
|
2012-12-18 00:02:11 +00:00
|
|
|
.name = "da830-rtc",
|
2014-12-10 23:53:01 +00:00
|
|
|
.driver_data = (kernel_ulong_t)&omap_rtc_da830_type,
|
|
|
|
}, {
|
|
|
|
/* sentinel */
|
|
|
|
}
|
2012-12-18 00:02:11 +00:00
|
|
|
};
|
2014-12-10 23:53:01 +00:00
|
|
|
MODULE_DEVICE_TABLE(platform, omap_rtc_id_table);
|
2012-12-18 00:02:11 +00:00
|
|
|
|
2012-12-18 00:02:15 +00:00
|
|
|
static const struct of_device_id omap_rtc_of_match[] = {
|
2014-12-10 23:53:01 +00:00
|
|
|
{
|
|
|
|
.compatible = "ti,am3352-rtc",
|
|
|
|
.data = &omap_rtc_am3352_type,
|
|
|
|
}, {
|
|
|
|
.compatible = "ti,da830-rtc",
|
|
|
|
.data = &omap_rtc_da830_type,
|
|
|
|
}, {
|
|
|
|
/* sentinel */
|
|
|
|
}
|
2012-12-18 00:02:15 +00:00
|
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, omap_rtc_of_match);
|
|
|
|
|
2008-07-24 04:30:38 +00:00
|
|
|
static int __init omap_rtc_probe(struct platform_device *pdev)
|
2006-12-07 04:38:36 +00:00
|
|
|
{
|
2014-12-10 23:52:55 +00:00
|
|
|
struct omap_rtc *rtc;
|
2013-04-29 23:20:04 +00:00
|
|
|
struct resource *res;
|
2014-12-10 23:53:04 +00:00
|
|
|
u8 reg, mask, new_ctrl;
|
2012-12-18 00:02:11 +00:00
|
|
|
const struct platform_device_id *id_entry;
|
2012-12-18 00:02:15 +00:00
|
|
|
const struct of_device_id *of_id;
|
2014-12-10 23:52:40 +00:00
|
|
|
int ret;
|
2012-12-18 00:02:15 +00:00
|
|
|
|
2014-12-10 23:52:55 +00:00
|
|
|
rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
|
|
|
|
if (!rtc)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
2012-12-18 00:02:15 +00:00
|
|
|
of_id = of_match_device(omap_rtc_of_match, &pdev->dev);
|
2014-12-10 23:53:01 +00:00
|
|
|
if (of_id) {
|
|
|
|
rtc->type = of_id->data;
|
|
|
|
} else {
|
|
|
|
id_entry = platform_get_device_id(pdev);
|
|
|
|
rtc->type = (void *)id_entry->driver_data;
|
2014-06-06 21:36:04 +00:00
|
|
|
}
|
|
|
|
|
2014-12-10 23:52:55 +00:00
|
|
|
rtc->irq_timer = platform_get_irq(pdev, 0);
|
|
|
|
if (rtc->irq_timer <= 0)
|
2006-12-07 04:38:36 +00:00
|
|
|
return -ENOENT;
|
|
|
|
|
2014-12-10 23:52:55 +00:00
|
|
|
rtc->irq_alarm = platform_get_irq(pdev, 1);
|
|
|
|
if (rtc->irq_alarm <= 0)
|
2006-12-07 04:38:36 +00:00
|
|
|
return -ENOENT;
|
|
|
|
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
2014-12-10 23:52:55 +00:00
|
|
|
rtc->base = devm_ioremap_resource(&pdev->dev, res);
|
|
|
|
if (IS_ERR(rtc->base))
|
|
|
|
return PTR_ERR(rtc->base);
|
|
|
|
|
|
|
|
platform_set_drvdata(pdev, rtc);
|
2009-12-16 00:46:11 +00:00
|
|
|
|
2012-12-18 00:02:18 +00:00
|
|
|
/* Enable the clock/module so that we can access the registers */
|
|
|
|
pm_runtime_enable(&pdev->dev);
|
|
|
|
pm_runtime_get_sync(&pdev->dev);
|
|
|
|
|
2014-12-10 23:53:01 +00:00
|
|
|
if (rtc->type->has_kicker) {
|
2014-12-10 23:52:55 +00:00
|
|
|
rtc_writel(rtc, OMAP_RTC_KICK0_REG, KICK0_VALUE);
|
|
|
|
rtc_writel(rtc, OMAP_RTC_KICK1_REG, KICK1_VALUE);
|
2012-12-18 00:02:11 +00:00
|
|
|
}
|
|
|
|
|
2014-12-10 23:52:36 +00:00
|
|
|
/*
|
|
|
|
* disable interrupts
|
|
|
|
*
|
|
|
|
* NOTE: ALARM2 is not cleared on AM3352 if rtc_write (writeb) is used
|
2006-12-07 04:38:36 +00:00
|
|
|
*/
|
2014-12-10 23:52:55 +00:00
|
|
|
rtc_writel(rtc, OMAP_RTC_INTERRUPTS_REG, 0);
|
2006-12-07 04:38:36 +00:00
|
|
|
|
2014-06-06 21:36:06 +00:00
|
|
|
/* enable RTC functional clock */
|
2014-12-10 23:53:01 +00:00
|
|
|
if (rtc->type->has_32kclk_en) {
|
2014-12-10 23:52:55 +00:00
|
|
|
reg = rtc_read(rtc, OMAP_RTC_OSC_REG);
|
|
|
|
rtc_writel(rtc, OMAP_RTC_OSC_REG,
|
|
|
|
reg | OMAP_RTC_OSC_32KCLK_EN);
|
2014-12-10 23:52:30 +00:00
|
|
|
}
|
2014-06-06 21:36:06 +00:00
|
|
|
|
2006-12-07 04:38:36 +00:00
|
|
|
/* clear old status */
|
2014-12-10 23:52:55 +00:00
|
|
|
reg = rtc_read(rtc, OMAP_RTC_STATUS_REG);
|
2014-12-10 23:53:04 +00:00
|
|
|
|
|
|
|
mask = OMAP_RTC_STATUS_ALARM;
|
|
|
|
|
|
|
|
if (rtc->type->has_power_up_reset) {
|
|
|
|
mask |= OMAP_RTC_STATUS_POWER_UP;
|
|
|
|
if (reg & OMAP_RTC_STATUS_POWER_UP)
|
|
|
|
dev_info(&pdev->dev, "RTC power up reset detected\n");
|
2006-12-07 04:38:36 +00:00
|
|
|
}
|
2014-12-10 23:53:04 +00:00
|
|
|
|
|
|
|
if (reg & mask)
|
|
|
|
rtc_write(rtc, OMAP_RTC_STATUS_REG, reg & mask);
|
2006-12-07 04:38:36 +00:00
|
|
|
|
|
|
|
/* On boards with split power, RTC_ON_NOFF won't reset the RTC */
|
2014-12-10 23:52:55 +00:00
|
|
|
reg = rtc_read(rtc, OMAP_RTC_CTRL_REG);
|
2006-12-07 04:38:36 +00:00
|
|
|
if (reg & (u8) OMAP_RTC_CTRL_STOP)
|
2014-12-10 23:52:49 +00:00
|
|
|
dev_info(&pdev->dev, "already running\n");
|
2006-12-07 04:38:36 +00:00
|
|
|
|
|
|
|
/* force to 24 hour mode */
|
2011-08-03 23:21:02 +00:00
|
|
|
new_ctrl = reg & (OMAP_RTC_CTRL_SPLIT|OMAP_RTC_CTRL_AUTO_COMP);
|
2006-12-07 04:38:36 +00:00
|
|
|
new_ctrl |= OMAP_RTC_CTRL_STOP;
|
|
|
|
|
|
|
|
/* BOARD-SPECIFIC CUSTOMIZATION CAN GO HERE:
|
|
|
|
*
|
2010-10-27 22:33:05 +00:00
|
|
|
* - Device wake-up capability setting should come through chip
|
|
|
|
* init logic. OMAP1 boards should initialize the "wakeup capable"
|
|
|
|
* flag in the platform device if the board is wired right for
|
|
|
|
* being woken up by RTC alarm. For OMAP-L138, this capability
|
|
|
|
* is built into the SoC by the "Deep Sleep" capability.
|
2006-12-07 04:38:36 +00:00
|
|
|
*
|
|
|
|
* - Boards wired so RTC_ON_nOFF is used as the reset signal,
|
|
|
|
* rather than nPWRON_RESET, should forcibly enable split
|
|
|
|
* power mode. (Some chip errata report that RTC_CTRL_SPLIT
|
|
|
|
* is write-only, and always reads as zero...)
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (new_ctrl & (u8) OMAP_RTC_CTRL_SPLIT)
|
2014-12-10 23:52:49 +00:00
|
|
|
dev_info(&pdev->dev, "split power mode\n");
|
2006-12-07 04:38:36 +00:00
|
|
|
|
|
|
|
if (reg != new_ctrl)
|
2014-12-10 23:52:55 +00:00
|
|
|
rtc_write(rtc, OMAP_RTC_CTRL_REG, new_ctrl);
|
2006-12-07 04:38:36 +00:00
|
|
|
|
2014-12-10 23:52:43 +00:00
|
|
|
device_init_wakeup(&pdev->dev, true);
|
|
|
|
|
2014-12-10 23:52:55 +00:00
|
|
|
rtc->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
|
2014-12-10 23:52:43 +00:00
|
|
|
&omap_rtc_ops, THIS_MODULE);
|
2014-12-10 23:52:55 +00:00
|
|
|
if (IS_ERR(rtc->rtc)) {
|
|
|
|
ret = PTR_ERR(rtc->rtc);
|
2014-12-10 23:52:43 +00:00
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* handle periodic and alarm irqs */
|
2014-12-10 23:52:55 +00:00
|
|
|
ret = devm_request_irq(&pdev->dev, rtc->irq_timer, rtc_irq, 0,
|
|
|
|
dev_name(&rtc->rtc->dev), rtc);
|
2014-12-10 23:52:43 +00:00
|
|
|
if (ret)
|
|
|
|
goto err;
|
|
|
|
|
2014-12-10 23:52:55 +00:00
|
|
|
if (rtc->irq_timer != rtc->irq_alarm) {
|
|
|
|
ret = devm_request_irq(&pdev->dev, rtc->irq_alarm, rtc_irq, 0,
|
|
|
|
dev_name(&rtc->rtc->dev), rtc);
|
2014-12-10 23:52:43 +00:00
|
|
|
if (ret)
|
|
|
|
goto err;
|
|
|
|
}
|
|
|
|
|
2006-12-07 04:38:36 +00:00
|
|
|
return 0;
|
|
|
|
|
2014-12-10 23:52:40 +00:00
|
|
|
err:
|
2014-12-10 23:52:33 +00:00
|
|
|
device_init_wakeup(&pdev->dev, false);
|
2014-12-10 23:53:01 +00:00
|
|
|
if (rtc->type->has_kicker)
|
2014-12-10 23:52:55 +00:00
|
|
|
rtc_writel(rtc, OMAP_RTC_KICK0_REG, 0);
|
2012-12-18 00:02:18 +00:00
|
|
|
pm_runtime_put_sync(&pdev->dev);
|
|
|
|
pm_runtime_disable(&pdev->dev);
|
2014-12-10 23:52:40 +00:00
|
|
|
|
|
|
|
return ret;
|
2006-12-07 04:38:36 +00:00
|
|
|
}
|
|
|
|
|
2008-07-24 04:30:38 +00:00
|
|
|
static int __exit omap_rtc_remove(struct platform_device *pdev)
|
2006-12-07 04:38:36 +00:00
|
|
|
{
|
2014-12-10 23:52:55 +00:00
|
|
|
struct omap_rtc *rtc = platform_get_drvdata(pdev);
|
2006-12-07 04:38:36 +00:00
|
|
|
|
|
|
|
device_init_wakeup(&pdev->dev, 0);
|
|
|
|
|
|
|
|
/* leave rtc running, but disable irqs */
|
2014-12-10 23:52:55 +00:00
|
|
|
rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, 0);
|
2006-12-07 04:38:36 +00:00
|
|
|
|
2014-12-10 23:53:01 +00:00
|
|
|
if (rtc->type->has_kicker)
|
2014-12-10 23:52:55 +00:00
|
|
|
rtc_writel(rtc, OMAP_RTC_KICK0_REG, 0);
|
2012-12-18 00:02:18 +00:00
|
|
|
|
|
|
|
/* Disable the clock/module */
|
|
|
|
pm_runtime_put_sync(&pdev->dev);
|
|
|
|
pm_runtime_disable(&pdev->dev);
|
|
|
|
|
2006-12-07 04:38:36 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2013-04-29 23:21:01 +00:00
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
|
|
static int omap_rtc_suspend(struct device *dev)
|
2006-12-07 04:38:36 +00:00
|
|
|
{
|
2014-12-10 23:52:55 +00:00
|
|
|
struct omap_rtc *rtc = dev_get_drvdata(dev);
|
|
|
|
|
|
|
|
rtc->interrupts_reg = rtc_read(rtc, OMAP_RTC_INTERRUPTS_REG);
|
2006-12-07 04:38:36 +00:00
|
|
|
|
|
|
|
/* FIXME the RTC alarm is not currently acting as a wakeup event
|
2013-09-11 21:24:18 +00:00
|
|
|
* source on some platforms, and in fact this enable() call is just
|
|
|
|
* saving a flag that's never used...
|
2006-12-07 04:38:36 +00:00
|
|
|
*/
|
2014-06-06 21:36:12 +00:00
|
|
|
if (device_may_wakeup(dev))
|
2014-12-10 23:52:55 +00:00
|
|
|
enable_irq_wake(rtc->irq_alarm);
|
2014-06-06 21:36:12 +00:00
|
|
|
else
|
2014-12-10 23:52:55 +00:00
|
|
|
rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, 0);
|
2006-12-07 04:38:36 +00:00
|
|
|
|
2012-12-18 00:02:18 +00:00
|
|
|
/* Disable the clock/module */
|
2013-04-29 23:21:01 +00:00
|
|
|
pm_runtime_put_sync(dev);
|
2012-12-18 00:02:18 +00:00
|
|
|
|
2006-12-07 04:38:36 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2013-04-29 23:21:01 +00:00
|
|
|
static int omap_rtc_resume(struct device *dev)
|
2006-12-07 04:38:36 +00:00
|
|
|
{
|
2014-12-10 23:52:55 +00:00
|
|
|
struct omap_rtc *rtc = dev_get_drvdata(dev);
|
|
|
|
|
2012-12-18 00:02:18 +00:00
|
|
|
/* Enable the clock/module so that we can access the registers */
|
2013-04-29 23:21:01 +00:00
|
|
|
pm_runtime_get_sync(dev);
|
2012-12-18 00:02:18 +00:00
|
|
|
|
2014-06-06 21:36:12 +00:00
|
|
|
if (device_may_wakeup(dev))
|
2014-12-10 23:52:55 +00:00
|
|
|
disable_irq_wake(rtc->irq_alarm);
|
2014-06-06 21:36:12 +00:00
|
|
|
else
|
2014-12-10 23:52:55 +00:00
|
|
|
rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, rtc->interrupts_reg);
|
2014-06-06 21:36:12 +00:00
|
|
|
|
2006-12-07 04:38:36 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2013-04-29 23:21:01 +00:00
|
|
|
static SIMPLE_DEV_PM_OPS(omap_rtc_pm_ops, omap_rtc_suspend, omap_rtc_resume);
|
|
|
|
|
2006-12-07 04:38:36 +00:00
|
|
|
static void omap_rtc_shutdown(struct platform_device *pdev)
|
|
|
|
{
|
2014-12-10 23:52:55 +00:00
|
|
|
struct omap_rtc *rtc = platform_get_drvdata(pdev);
|
|
|
|
|
|
|
|
rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, 0);
|
2006-12-07 04:38:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static struct platform_driver omap_rtc_driver = {
|
2008-07-24 04:30:38 +00:00
|
|
|
.remove = __exit_p(omap_rtc_remove),
|
2006-12-07 04:38:36 +00:00
|
|
|
.shutdown = omap_rtc_shutdown,
|
|
|
|
.driver = {
|
2014-12-10 23:52:58 +00:00
|
|
|
.name = "omap_rtc",
|
2006-12-07 04:38:36 +00:00
|
|
|
.owner = THIS_MODULE,
|
2013-04-29 23:21:01 +00:00
|
|
|
.pm = &omap_rtc_pm_ops,
|
2013-11-12 23:10:55 +00:00
|
|
|
.of_match_table = omap_rtc_of_match,
|
2006-12-07 04:38:36 +00:00
|
|
|
},
|
2014-12-10 23:53:01 +00:00
|
|
|
.id_table = omap_rtc_id_table,
|
2006-12-07 04:38:36 +00:00
|
|
|
};
|
|
|
|
|
2013-04-29 23:18:46 +00:00
|
|
|
module_platform_driver_probe(omap_rtc_driver, omap_rtc_probe);
|
2006-12-07 04:38:36 +00:00
|
|
|
|
2014-12-10 23:52:58 +00:00
|
|
|
MODULE_ALIAS("platform:omap_rtc");
|
2006-12-07 04:38:36 +00:00
|
|
|
MODULE_AUTHOR("George G. Davis (and others)");
|
|
|
|
MODULE_LICENSE("GPL");
|