![Hebbar Gururaja](/assets/img/avatar_default.png)
rtc-omap driver modules is used both by OMAP1/2, Davinci SoC platforms. However, rtc wake support on OMAP1 is broken. Hence the device_init_wakeup() was removed from rtc-omap driver and moved to platform board files that supported it (DA850/OMAP-L138). [1] However, recently [2] it was suggested that driver should always do a device_init_wakeup(dev, true). Platforms that don't want/need wakeup support can disable it from userspace via: echo disabled > /sys/devices/.../power/wakeup Also, with the new DT boot-up, board file doesn't exist and hence there is no way to have device wakeup support rtc. The fix for above issues, is to hard code device_init_wakeup() inside driver and let platforms that don't need this, handle it through the sysfs power entry. [1] https://patchwork.kernel.org/patch/136731/ [2] http://www.mail-archive.com/davinci-linux-open-source@linux. davincidsp.com/msg26077.html Signed-off-by: Hebbar Gururaja <gururaja.hebbar@ti.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Acked-by: Kevin Hilman <khilman@linaro.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
521 lines
14 KiB
C
521 lines
14 KiB
C
/*
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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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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/io.h>
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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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* 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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*/
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#define DRIVER_NAME "omap_rtc"
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#define OMAP_RTC_BASE 0xfffb4800
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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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#define OMAP_RTC_KICK0_REG 0x6c
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#define OMAP_RTC_KICK1_REG 0x70
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/* OMAP_RTC_CTRL_REG bit fields: */
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#define OMAP_RTC_CTRL_SPLIT (1<<7)
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#define OMAP_RTC_CTRL_DISABLE (1<<6)
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#define OMAP_RTC_CTRL_SET_32_COUNTER (1<<5)
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#define OMAP_RTC_CTRL_TEST (1<<4)
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#define OMAP_RTC_CTRL_MODE_12_24 (1<<3)
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#define OMAP_RTC_CTRL_AUTO_COMP (1<<2)
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#define OMAP_RTC_CTRL_ROUND_30S (1<<1)
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#define OMAP_RTC_CTRL_STOP (1<<0)
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/* OMAP_RTC_STATUS_REG bit fields: */
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#define OMAP_RTC_STATUS_POWER_UP (1<<7)
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#define OMAP_RTC_STATUS_ALARM (1<<6)
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#define OMAP_RTC_STATUS_1D_EVENT (1<<5)
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#define OMAP_RTC_STATUS_1H_EVENT (1<<4)
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#define OMAP_RTC_STATUS_1M_EVENT (1<<3)
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#define OMAP_RTC_STATUS_1S_EVENT (1<<2)
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#define OMAP_RTC_STATUS_RUN (1<<1)
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#define OMAP_RTC_STATUS_BUSY (1<<0)
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/* OMAP_RTC_INTERRUPTS_REG bit fields: */
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#define OMAP_RTC_INTERRUPTS_IT_ALARM (1<<3)
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#define OMAP_RTC_INTERRUPTS_IT_TIMER (1<<2)
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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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#define OMAP_RTC_HAS_KICKER 0x1
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static void __iomem *rtc_base;
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#define rtc_read(addr) readb(rtc_base + (addr))
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#define rtc_write(val, addr) writeb(val, rtc_base + (addr))
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#define rtc_writel(val, addr) writel(val, rtc_base + (addr))
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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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static void rtc_wait_not_busy(void)
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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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status = rtc_read(OMAP_RTC_STATUS_REG);
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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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static irqreturn_t rtc_irq(int irq, void *rtc)
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{
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unsigned long events = 0;
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u8 irq_data;
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irq_data = rtc_read(OMAP_RTC_STATUS_REG);
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/* alarm irq? */
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if (irq_data & OMAP_RTC_STATUS_ALARM) {
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rtc_write(OMAP_RTC_STATUS_ALARM, OMAP_RTC_STATUS_REG);
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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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rtc_update_irq(rtc, 1, events);
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return IRQ_HANDLED;
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}
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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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u8 reg;
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local_irq_disable();
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rtc_wait_not_busy();
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reg = rtc_read(OMAP_RTC_INTERRUPTS_REG);
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if (enabled)
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reg |= OMAP_RTC_INTERRUPTS_IT_ALARM;
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else
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reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM;
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rtc_wait_not_busy();
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rtc_write(reg, OMAP_RTC_INTERRUPTS_REG);
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local_irq_enable();
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return 0;
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}
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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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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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tm->tm_mon = bin2bcd(tm->tm_mon + 1);
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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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tm->tm_year = bin2bcd(tm->tm_year - 100);
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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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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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/* epoch == 1900 */
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tm->tm_year = bcd2bin(tm->tm_year) + 100;
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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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/* we don't report wday/yday/isdst ... */
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local_irq_disable();
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rtc_wait_not_busy();
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tm->tm_sec = rtc_read(OMAP_RTC_SECONDS_REG);
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tm->tm_min = rtc_read(OMAP_RTC_MINUTES_REG);
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tm->tm_hour = rtc_read(OMAP_RTC_HOURS_REG);
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tm->tm_mday = rtc_read(OMAP_RTC_DAYS_REG);
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tm->tm_mon = rtc_read(OMAP_RTC_MONTHS_REG);
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tm->tm_year = rtc_read(OMAP_RTC_YEARS_REG);
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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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if (tm2bcd(tm) < 0)
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return -EINVAL;
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local_irq_disable();
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rtc_wait_not_busy();
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rtc_write(tm->tm_year, OMAP_RTC_YEARS_REG);
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rtc_write(tm->tm_mon, OMAP_RTC_MONTHS_REG);
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rtc_write(tm->tm_mday, OMAP_RTC_DAYS_REG);
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rtc_write(tm->tm_hour, OMAP_RTC_HOURS_REG);
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rtc_write(tm->tm_min, OMAP_RTC_MINUTES_REG);
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rtc_write(tm->tm_sec, OMAP_RTC_SECONDS_REG);
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local_irq_enable();
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return 0;
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}
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static int omap_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
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{
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local_irq_disable();
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rtc_wait_not_busy();
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alm->time.tm_sec = rtc_read(OMAP_RTC_ALARM_SECONDS_REG);
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alm->time.tm_min = rtc_read(OMAP_RTC_ALARM_MINUTES_REG);
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alm->time.tm_hour = rtc_read(OMAP_RTC_ALARM_HOURS_REG);
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alm->time.tm_mday = rtc_read(OMAP_RTC_ALARM_DAYS_REG);
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alm->time.tm_mon = rtc_read(OMAP_RTC_ALARM_MONTHS_REG);
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alm->time.tm_year = rtc_read(OMAP_RTC_ALARM_YEARS_REG);
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local_irq_enable();
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bcd2tm(&alm->time);
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alm->enabled = !!(rtc_read(OMAP_RTC_INTERRUPTS_REG)
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& OMAP_RTC_INTERRUPTS_IT_ALARM);
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return 0;
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}
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static int omap_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
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{
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u8 reg;
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if (tm2bcd(&alm->time) < 0)
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return -EINVAL;
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local_irq_disable();
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rtc_wait_not_busy();
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rtc_write(alm->time.tm_year, OMAP_RTC_ALARM_YEARS_REG);
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rtc_write(alm->time.tm_mon, OMAP_RTC_ALARM_MONTHS_REG);
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rtc_write(alm->time.tm_mday, OMAP_RTC_ALARM_DAYS_REG);
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rtc_write(alm->time.tm_hour, OMAP_RTC_ALARM_HOURS_REG);
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rtc_write(alm->time.tm_min, OMAP_RTC_ALARM_MINUTES_REG);
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rtc_write(alm->time.tm_sec, OMAP_RTC_ALARM_SECONDS_REG);
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reg = rtc_read(OMAP_RTC_INTERRUPTS_REG);
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if (alm->enabled)
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reg |= OMAP_RTC_INTERRUPTS_IT_ALARM;
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else
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reg &= ~OMAP_RTC_INTERRUPTS_IT_ALARM;
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rtc_write(reg, OMAP_RTC_INTERRUPTS_REG);
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local_irq_enable();
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return 0;
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}
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static struct rtc_class_ops omap_rtc_ops = {
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.read_time = omap_rtc_read_time,
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.set_time = omap_rtc_set_time,
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.read_alarm = omap_rtc_read_alarm,
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.set_alarm = omap_rtc_set_alarm,
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.alarm_irq_enable = omap_rtc_alarm_irq_enable,
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};
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static int omap_rtc_alarm;
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static int omap_rtc_timer;
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#define OMAP_RTC_DATA_DA830_IDX 1
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static struct platform_device_id omap_rtc_devtype[] = {
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{
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.name = DRIVER_NAME,
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}, {
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.name = "da830-rtc",
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.driver_data = OMAP_RTC_HAS_KICKER,
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},
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{},
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};
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MODULE_DEVICE_TABLE(platform, omap_rtc_devtype);
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static const struct of_device_id omap_rtc_of_match[] = {
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{ .compatible = "ti,da830-rtc",
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.data = &omap_rtc_devtype[OMAP_RTC_DATA_DA830_IDX],
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, omap_rtc_of_match);
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static int __init omap_rtc_probe(struct platform_device *pdev)
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{
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struct resource *res;
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struct rtc_device *rtc;
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u8 reg, new_ctrl;
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const struct platform_device_id *id_entry;
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const struct of_device_id *of_id;
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of_id = of_match_device(omap_rtc_of_match, &pdev->dev);
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if (of_id)
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pdev->id_entry = of_id->data;
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omap_rtc_timer = platform_get_irq(pdev, 0);
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if (omap_rtc_timer <= 0) {
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pr_debug("%s: no update irq?\n", pdev->name);
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return -ENOENT;
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}
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omap_rtc_alarm = platform_get_irq(pdev, 1);
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if (omap_rtc_alarm <= 0) {
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pr_debug("%s: no alarm irq?\n", pdev->name);
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return -ENOENT;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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rtc_base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(rtc_base))
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return PTR_ERR(rtc_base);
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/* Enable the clock/module so that we can access the registers */
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pm_runtime_enable(&pdev->dev);
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pm_runtime_get_sync(&pdev->dev);
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id_entry = platform_get_device_id(pdev);
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if (id_entry && (id_entry->driver_data & OMAP_RTC_HAS_KICKER)) {
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rtc_writel(KICK0_VALUE, OMAP_RTC_KICK0_REG);
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rtc_writel(KICK1_VALUE, OMAP_RTC_KICK1_REG);
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}
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rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
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&omap_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc)) {
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pr_debug("%s: can't register RTC device, err %ld\n",
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pdev->name, PTR_ERR(rtc));
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goto fail0;
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}
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platform_set_drvdata(pdev, rtc);
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/* clear pending irqs, and set 1/second periodic,
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* which we'll use instead of update irqs
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*/
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rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
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/* clear old status */
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reg = rtc_read(OMAP_RTC_STATUS_REG);
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if (reg & (u8) OMAP_RTC_STATUS_POWER_UP) {
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pr_info("%s: RTC power up reset detected\n",
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pdev->name);
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rtc_write(OMAP_RTC_STATUS_POWER_UP, OMAP_RTC_STATUS_REG);
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}
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if (reg & (u8) OMAP_RTC_STATUS_ALARM)
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rtc_write(OMAP_RTC_STATUS_ALARM, OMAP_RTC_STATUS_REG);
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/* handle periodic and alarm irqs */
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if (devm_request_irq(&pdev->dev, omap_rtc_timer, rtc_irq, 0,
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dev_name(&rtc->dev), rtc)) {
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pr_debug("%s: RTC timer interrupt IRQ%d already claimed\n",
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pdev->name, omap_rtc_timer);
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goto fail0;
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}
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if ((omap_rtc_timer != omap_rtc_alarm) &&
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(devm_request_irq(&pdev->dev, omap_rtc_alarm, rtc_irq, 0,
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dev_name(&rtc->dev), rtc))) {
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pr_debug("%s: RTC alarm interrupt IRQ%d already claimed\n",
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pdev->name, omap_rtc_alarm);
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goto fail0;
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}
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/* On boards with split power, RTC_ON_NOFF won't reset the RTC */
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reg = rtc_read(OMAP_RTC_CTRL_REG);
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if (reg & (u8) OMAP_RTC_CTRL_STOP)
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pr_info("%s: already running\n", pdev->name);
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/* force to 24 hour mode */
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new_ctrl = reg & (OMAP_RTC_CTRL_SPLIT|OMAP_RTC_CTRL_AUTO_COMP);
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new_ctrl |= OMAP_RTC_CTRL_STOP;
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/* BOARD-SPECIFIC CUSTOMIZATION CAN GO HERE:
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*
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* - Device wake-up capability setting should come through chip
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* init logic. OMAP1 boards should initialize the "wakeup capable"
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* flag in the platform device if the board is wired right for
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* being woken up by RTC alarm. For OMAP-L138, this capability
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* is built into the SoC by the "Deep Sleep" capability.
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*
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* - Boards wired so RTC_ON_nOFF is used as the reset signal,
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* rather than nPWRON_RESET, should forcibly enable split
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* power mode. (Some chip errata report that RTC_CTRL_SPLIT
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* is write-only, and always reads as zero...)
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*/
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device_init_wakeup(&pdev->dev, true);
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if (new_ctrl & (u8) OMAP_RTC_CTRL_SPLIT)
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pr_info("%s: split power mode\n", pdev->name);
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if (reg != new_ctrl)
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rtc_write(new_ctrl, OMAP_RTC_CTRL_REG);
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return 0;
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|
|
fail0:
|
|
if (id_entry && (id_entry->driver_data & OMAP_RTC_HAS_KICKER))
|
|
rtc_writel(0, OMAP_RTC_KICK0_REG);
|
|
pm_runtime_put_sync(&pdev->dev);
|
|
pm_runtime_disable(&pdev->dev);
|
|
return -EIO;
|
|
}
|
|
|
|
static int __exit omap_rtc_remove(struct platform_device *pdev)
|
|
{
|
|
const struct platform_device_id *id_entry =
|
|
platform_get_device_id(pdev);
|
|
|
|
device_init_wakeup(&pdev->dev, 0);
|
|
|
|
/* leave rtc running, but disable irqs */
|
|
rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
|
|
|
|
if (id_entry && (id_entry->driver_data & OMAP_RTC_HAS_KICKER))
|
|
rtc_writel(0, OMAP_RTC_KICK0_REG);
|
|
|
|
/* Disable the clock/module */
|
|
pm_runtime_put_sync(&pdev->dev);
|
|
pm_runtime_disable(&pdev->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static u8 irqstat;
|
|
|
|
static int omap_rtc_suspend(struct device *dev)
|
|
{
|
|
irqstat = rtc_read(OMAP_RTC_INTERRUPTS_REG);
|
|
|
|
/* FIXME the RTC alarm is not currently acting as a wakeup event
|
|
* source, and in fact this enable() call is just saving a flag
|
|
* that's never used...
|
|
*/
|
|
if (device_may_wakeup(dev))
|
|
enable_irq_wake(omap_rtc_alarm);
|
|
else
|
|
rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
|
|
|
|
/* Disable the clock/module */
|
|
pm_runtime_put_sync(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int omap_rtc_resume(struct device *dev)
|
|
{
|
|
/* Enable the clock/module so that we can access the registers */
|
|
pm_runtime_get_sync(dev);
|
|
|
|
if (device_may_wakeup(dev))
|
|
disable_irq_wake(omap_rtc_alarm);
|
|
else
|
|
rtc_write(irqstat, OMAP_RTC_INTERRUPTS_REG);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(omap_rtc_pm_ops, omap_rtc_suspend, omap_rtc_resume);
|
|
|
|
static void omap_rtc_shutdown(struct platform_device *pdev)
|
|
{
|
|
rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
|
|
}
|
|
|
|
MODULE_ALIAS("platform:omap_rtc");
|
|
static struct platform_driver omap_rtc_driver = {
|
|
.remove = __exit_p(omap_rtc_remove),
|
|
.shutdown = omap_rtc_shutdown,
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.owner = THIS_MODULE,
|
|
.pm = &omap_rtc_pm_ops,
|
|
.of_match_table = of_match_ptr(omap_rtc_of_match),
|
|
},
|
|
.id_table = omap_rtc_devtype,
|
|
};
|
|
|
|
module_platform_driver_probe(omap_rtc_driver, omap_rtc_probe);
|
|
|
|
MODULE_AUTHOR("George G. Davis (and others)");
|
|
MODULE_LICENSE("GPL");
|