370 lines
8.7 KiB
C
370 lines
8.7 KiB
C
/*
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* Real-time clock driver for MPC5121
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*
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* Copyright 2007, Domen Puncer <domen.puncer@telargo.com>
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* Copyright 2008, Freescale Semiconductor, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/rtc.h>
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#include <linux/of_device.h>
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#include <linux/of_platform.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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struct mpc5121_rtc_regs {
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u8 set_time; /* RTC + 0x00 */
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u8 hour_set; /* RTC + 0x01 */
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u8 minute_set; /* RTC + 0x02 */
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u8 second_set; /* RTC + 0x03 */
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u8 set_date; /* RTC + 0x04 */
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u8 month_set; /* RTC + 0x05 */
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u8 weekday_set; /* RTC + 0x06 */
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u8 date_set; /* RTC + 0x07 */
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u8 write_sw; /* RTC + 0x08 */
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u8 sw_set; /* RTC + 0x09 */
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u16 year_set; /* RTC + 0x0a */
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u8 alm_enable; /* RTC + 0x0c */
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u8 alm_hour_set; /* RTC + 0x0d */
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u8 alm_min_set; /* RTC + 0x0e */
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u8 int_enable; /* RTC + 0x0f */
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u8 reserved1;
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u8 hour; /* RTC + 0x11 */
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u8 minute; /* RTC + 0x12 */
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u8 second; /* RTC + 0x13 */
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u8 month; /* RTC + 0x14 */
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u8 wday_mday; /* RTC + 0x15 */
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u16 year; /* RTC + 0x16 */
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u8 int_alm; /* RTC + 0x18 */
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u8 int_sw; /* RTC + 0x19 */
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u8 alm_status; /* RTC + 0x1a */
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u8 sw_minute; /* RTC + 0x1b */
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u8 bus_error_1; /* RTC + 0x1c */
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u8 int_day; /* RTC + 0x1d */
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u8 int_min; /* RTC + 0x1e */
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u8 int_sec; /* RTC + 0x1f */
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/*
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* target_time:
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* intended to be used for hibernation but hibernation
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* does not work on silicon rev 1.5 so use it for non-volatile
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* storage of offset between the actual_time register and linux
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* time
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*/
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u32 target_time; /* RTC + 0x20 */
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/*
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* actual_time:
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* readonly time since VBAT_RTC was last connected
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*/
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u32 actual_time; /* RTC + 0x24 */
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u32 keep_alive; /* RTC + 0x28 */
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};
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struct mpc5121_rtc_data {
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unsigned irq;
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unsigned irq_periodic;
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struct mpc5121_rtc_regs __iomem *regs;
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struct rtc_device *rtc;
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struct rtc_wkalrm wkalarm;
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};
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/*
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* Update second/minute/hour registers.
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*
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* This is just so alarm will work.
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*/
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static void mpc5121_rtc_update_smh(struct mpc5121_rtc_regs __iomem *regs,
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struct rtc_time *tm)
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{
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out_8(®s->second_set, tm->tm_sec);
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out_8(®s->minute_set, tm->tm_min);
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out_8(®s->hour_set, tm->tm_hour);
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/* set time sequence */
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out_8(®s->set_time, 0x1);
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out_8(®s->set_time, 0x3);
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out_8(®s->set_time, 0x1);
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out_8(®s->set_time, 0x0);
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}
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static int mpc5121_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
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struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
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unsigned long now;
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/*
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* linux time is actual_time plus the offset saved in target_time
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*/
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now = in_be32(®s->actual_time) + in_be32(®s->target_time);
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rtc_time_to_tm(now, tm);
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/*
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* update second minute hour registers
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* so alarms will work
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*/
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mpc5121_rtc_update_smh(regs, tm);
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return rtc_valid_tm(tm);
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}
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static int mpc5121_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
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struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
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int ret;
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unsigned long now;
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/*
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* The actual_time register is read only so we write the offset
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* between it and linux time to the target_time register.
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*/
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ret = rtc_tm_to_time(tm, &now);
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if (ret == 0)
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out_be32(®s->target_time, now - in_be32(®s->actual_time));
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/*
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* update second minute hour registers
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* so alarms will work
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*/
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mpc5121_rtc_update_smh(regs, tm);
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return 0;
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}
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static int mpc5121_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
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struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
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*alarm = rtc->wkalarm;
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alarm->pending = in_8(®s->alm_status);
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return 0;
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}
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static int mpc5121_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
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{
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struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
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struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
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/*
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* the alarm has no seconds so deal with it
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*/
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if (alarm->time.tm_sec) {
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alarm->time.tm_sec = 0;
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alarm->time.tm_min++;
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if (alarm->time.tm_min >= 60) {
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alarm->time.tm_min = 0;
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alarm->time.tm_hour++;
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if (alarm->time.tm_hour >= 24)
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alarm->time.tm_hour = 0;
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}
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}
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alarm->time.tm_mday = -1;
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alarm->time.tm_mon = -1;
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alarm->time.tm_year = -1;
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out_8(®s->alm_min_set, alarm->time.tm_min);
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out_8(®s->alm_hour_set, alarm->time.tm_hour);
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out_8(®s->alm_enable, alarm->enabled);
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rtc->wkalarm = *alarm;
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return 0;
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}
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static irqreturn_t mpc5121_rtc_handler(int irq, void *dev)
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{
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struct mpc5121_rtc_data *rtc = dev_get_drvdata((struct device *)dev);
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struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
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if (in_8(®s->int_alm)) {
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/* acknowledge and clear status */
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out_8(®s->int_alm, 1);
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out_8(®s->alm_status, 1);
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rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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static irqreturn_t mpc5121_rtc_handler_upd(int irq, void *dev)
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{
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struct mpc5121_rtc_data *rtc = dev_get_drvdata((struct device *)dev);
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struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
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if (in_8(®s->int_sec) && (in_8(®s->int_enable) & 0x1)) {
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/* acknowledge */
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out_8(®s->int_sec, 1);
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rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_UF);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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static int mpc5121_rtc_alarm_irq_enable(struct device *dev,
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unsigned int enabled)
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{
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struct mpc5121_rtc_data *rtc = dev_get_drvdata(dev);
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struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
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int val;
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if (enabled)
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val = 1;
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else
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val = 0;
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out_8(®s->alm_enable, val);
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rtc->wkalarm.enabled = val;
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return 0;
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}
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static const struct rtc_class_ops mpc5121_rtc_ops = {
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.read_time = mpc5121_rtc_read_time,
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.set_time = mpc5121_rtc_set_time,
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.read_alarm = mpc5121_rtc_read_alarm,
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.set_alarm = mpc5121_rtc_set_alarm,
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.alarm_irq_enable = mpc5121_rtc_alarm_irq_enable,
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};
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static int __devinit mpc5121_rtc_probe(struct platform_device *op)
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{
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struct mpc5121_rtc_data *rtc;
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int err = 0;
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u32 ka;
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rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
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if (!rtc)
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return -ENOMEM;
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rtc->regs = of_iomap(op->dev.of_node, 0);
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if (!rtc->regs) {
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dev_err(&op->dev, "%s: couldn't map io space\n", __func__);
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err = -ENOSYS;
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goto out_free;
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}
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device_init_wakeup(&op->dev, 1);
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dev_set_drvdata(&op->dev, rtc);
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rtc->irq = irq_of_parse_and_map(op->dev.of_node, 1);
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err = request_irq(rtc->irq, mpc5121_rtc_handler, IRQF_DISABLED,
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"mpc5121-rtc", &op->dev);
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if (err) {
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dev_err(&op->dev, "%s: could not request irq: %i\n",
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__func__, rtc->irq);
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goto out_dispose;
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}
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rtc->irq_periodic = irq_of_parse_and_map(op->dev.of_node, 0);
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err = request_irq(rtc->irq_periodic, mpc5121_rtc_handler_upd,
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IRQF_DISABLED, "mpc5121-rtc_upd", &op->dev);
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if (err) {
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dev_err(&op->dev, "%s: could not request irq: %i\n",
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__func__, rtc->irq_periodic);
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goto out_dispose2;
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}
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ka = in_be32(&rtc->regs->keep_alive);
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if (ka & 0x02) {
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dev_warn(&op->dev,
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"mpc5121-rtc: Battery or oscillator failure!\n");
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out_be32(&rtc->regs->keep_alive, ka);
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}
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rtc->rtc = rtc_device_register("mpc5121-rtc", &op->dev,
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&mpc5121_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc->rtc)) {
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err = PTR_ERR(rtc->rtc);
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goto out_free_irq;
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}
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return 0;
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out_free_irq:
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free_irq(rtc->irq_periodic, &op->dev);
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out_dispose2:
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irq_dispose_mapping(rtc->irq_periodic);
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free_irq(rtc->irq, &op->dev);
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out_dispose:
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irq_dispose_mapping(rtc->irq);
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iounmap(rtc->regs);
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out_free:
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kfree(rtc);
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return err;
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}
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static int __devexit mpc5121_rtc_remove(struct platform_device *op)
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{
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struct mpc5121_rtc_data *rtc = dev_get_drvdata(&op->dev);
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struct mpc5121_rtc_regs __iomem *regs = rtc->regs;
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/* disable interrupt, so there are no nasty surprises */
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out_8(®s->alm_enable, 0);
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out_8(®s->int_enable, in_8(®s->int_enable) & ~0x1);
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rtc_device_unregister(rtc->rtc);
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iounmap(rtc->regs);
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free_irq(rtc->irq, &op->dev);
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free_irq(rtc->irq_periodic, &op->dev);
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irq_dispose_mapping(rtc->irq);
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irq_dispose_mapping(rtc->irq_periodic);
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dev_set_drvdata(&op->dev, NULL);
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kfree(rtc);
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return 0;
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}
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static struct of_device_id mpc5121_rtc_match[] __devinitdata = {
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{ .compatible = "fsl,mpc5121-rtc", },
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{},
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};
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static struct platform_driver mpc5121_rtc_driver = {
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.driver = {
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.name = "mpc5121-rtc",
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.owner = THIS_MODULE,
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.of_match_table = mpc5121_rtc_match,
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},
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.probe = mpc5121_rtc_probe,
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.remove = __devexit_p(mpc5121_rtc_remove),
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};
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static int __init mpc5121_rtc_init(void)
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{
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return platform_driver_register(&mpc5121_rtc_driver);
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}
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module_init(mpc5121_rtc_init);
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static void __exit mpc5121_rtc_exit(void)
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{
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platform_driver_unregister(&mpc5121_rtc_driver);
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}
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module_exit(mpc5121_rtc_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("John Rigby <jcrigby@gmail.com>");
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