316 lines
8.8 KiB
C
316 lines
8.8 KiB
C
/*
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* TX4939 internal RTC driver
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* Based on RBTX49xx patch from CELF patch archive.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* (C) Copyright TOSHIBA CORPORATION 2005-2007
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*/
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#include <linux/rtc.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <asm/txx9/tx4939.h>
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struct tx4939rtc_plat_data {
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struct rtc_device *rtc;
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struct tx4939_rtc_reg __iomem *rtcreg;
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};
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static struct tx4939rtc_plat_data *get_tx4939rtc_plat_data(struct device *dev)
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{
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return platform_get_drvdata(to_platform_device(dev));
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}
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static int tx4939_rtc_cmd(struct tx4939_rtc_reg __iomem *rtcreg, int cmd)
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{
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int i = 0;
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__raw_writel(cmd, &rtcreg->ctl);
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/* This might take 30us (next 32.768KHz clock) */
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while (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_BUSY) {
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/* timeout on approx. 100us (@ GBUS200MHz) */
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if (i++ > 200 * 100)
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return -EBUSY;
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cpu_relax();
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}
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return 0;
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}
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static int tx4939_rtc_set_mmss(struct device *dev, unsigned long secs)
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{
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struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
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struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
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int i, ret;
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unsigned char buf[6];
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buf[0] = 0;
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buf[1] = 0;
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buf[2] = secs;
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buf[3] = secs >> 8;
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buf[4] = secs >> 16;
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buf[5] = secs >> 24;
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spin_lock_irq(&pdata->rtc->irq_lock);
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__raw_writel(0, &rtcreg->adr);
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for (i = 0; i < 6; i++)
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__raw_writel(buf[i], &rtcreg->dat);
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ret = tx4939_rtc_cmd(rtcreg,
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TX4939_RTCCTL_COMMAND_SETTIME |
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(__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME));
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spin_unlock_irq(&pdata->rtc->irq_lock);
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return ret;
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}
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static int tx4939_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
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struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
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int i, ret;
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unsigned long sec;
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unsigned char buf[6];
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spin_lock_irq(&pdata->rtc->irq_lock);
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ret = tx4939_rtc_cmd(rtcreg,
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TX4939_RTCCTL_COMMAND_GETTIME |
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(__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME));
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if (ret) {
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spin_unlock_irq(&pdata->rtc->irq_lock);
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return ret;
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}
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__raw_writel(2, &rtcreg->adr);
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for (i = 2; i < 6; i++)
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buf[i] = __raw_readl(&rtcreg->dat);
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spin_unlock_irq(&pdata->rtc->irq_lock);
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sec = (buf[5] << 24) | (buf[4] << 16) | (buf[3] << 8) | buf[2];
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rtc_time_to_tm(sec, tm);
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return rtc_valid_tm(tm);
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}
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static int tx4939_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
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struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
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int i, ret;
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unsigned long sec;
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unsigned char buf[6];
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if (alrm->time.tm_sec < 0 ||
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alrm->time.tm_min < 0 ||
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alrm->time.tm_hour < 0 ||
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alrm->time.tm_mday < 0 ||
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alrm->time.tm_mon < 0 ||
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alrm->time.tm_year < 0)
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return -EINVAL;
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rtc_tm_to_time(&alrm->time, &sec);
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buf[0] = 0;
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buf[1] = 0;
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buf[2] = sec;
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buf[3] = sec >> 8;
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buf[4] = sec >> 16;
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buf[5] = sec >> 24;
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spin_lock_irq(&pdata->rtc->irq_lock);
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__raw_writel(0, &rtcreg->adr);
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for (i = 0; i < 6; i++)
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__raw_writel(buf[i], &rtcreg->dat);
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ret = tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_SETALARM |
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(alrm->enabled ? TX4939_RTCCTL_ALME : 0));
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spin_unlock_irq(&pdata->rtc->irq_lock);
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return ret;
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}
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static int tx4939_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
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struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
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int i, ret;
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unsigned long sec;
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unsigned char buf[6];
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u32 ctl;
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spin_lock_irq(&pdata->rtc->irq_lock);
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ret = tx4939_rtc_cmd(rtcreg,
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TX4939_RTCCTL_COMMAND_GETALARM |
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(__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALME));
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if (ret) {
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spin_unlock_irq(&pdata->rtc->irq_lock);
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return ret;
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}
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__raw_writel(2, &rtcreg->adr);
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for (i = 2; i < 6; i++)
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buf[i] = __raw_readl(&rtcreg->dat);
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ctl = __raw_readl(&rtcreg->ctl);
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alrm->enabled = (ctl & TX4939_RTCCTL_ALME) ? 1 : 0;
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alrm->pending = (ctl & TX4939_RTCCTL_ALMD) ? 1 : 0;
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spin_unlock_irq(&pdata->rtc->irq_lock);
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sec = (buf[5] << 24) | (buf[4] << 16) | (buf[3] << 8) | buf[2];
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rtc_time_to_tm(sec, &alrm->time);
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return rtc_valid_tm(&alrm->time);
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}
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static int tx4939_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
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spin_lock_irq(&pdata->rtc->irq_lock);
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tx4939_rtc_cmd(pdata->rtcreg,
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TX4939_RTCCTL_COMMAND_NOP |
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(enabled ? TX4939_RTCCTL_ALME : 0));
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spin_unlock_irq(&pdata->rtc->irq_lock);
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return 0;
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}
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static irqreturn_t tx4939_rtc_interrupt(int irq, void *dev_id)
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{
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struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev_id);
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struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
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unsigned long events = RTC_IRQF;
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spin_lock(&pdata->rtc->irq_lock);
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if (__raw_readl(&rtcreg->ctl) & TX4939_RTCCTL_ALMD) {
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events |= RTC_AF;
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tx4939_rtc_cmd(rtcreg, TX4939_RTCCTL_COMMAND_NOP);
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}
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spin_unlock(&pdata->rtc->irq_lock);
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rtc_update_irq(pdata->rtc, 1, events);
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return IRQ_HANDLED;
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}
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static const struct rtc_class_ops tx4939_rtc_ops = {
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.read_time = tx4939_rtc_read_time,
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.read_alarm = tx4939_rtc_read_alarm,
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.set_alarm = tx4939_rtc_set_alarm,
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.set_mmss = tx4939_rtc_set_mmss,
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.alarm_irq_enable = tx4939_rtc_alarm_irq_enable,
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};
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static ssize_t tx4939_rtc_nvram_read(struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t pos, size_t size)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
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struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
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ssize_t count;
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spin_lock_irq(&pdata->rtc->irq_lock);
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for (count = 0; size > 0 && pos < TX4939_RTC_REG_RAMSIZE;
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count++, size--) {
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__raw_writel(pos++, &rtcreg->adr);
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*buf++ = __raw_readl(&rtcreg->dat);
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}
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spin_unlock_irq(&pdata->rtc->irq_lock);
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return count;
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}
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static ssize_t tx4939_rtc_nvram_write(struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t pos, size_t size)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct tx4939rtc_plat_data *pdata = get_tx4939rtc_plat_data(dev);
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struct tx4939_rtc_reg __iomem *rtcreg = pdata->rtcreg;
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ssize_t count;
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spin_lock_irq(&pdata->rtc->irq_lock);
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for (count = 0; size > 0 && pos < TX4939_RTC_REG_RAMSIZE;
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count++, size--) {
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__raw_writel(pos++, &rtcreg->adr);
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__raw_writel(*buf++, &rtcreg->dat);
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}
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spin_unlock_irq(&pdata->rtc->irq_lock);
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return count;
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}
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static struct bin_attribute tx4939_rtc_nvram_attr = {
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.attr = {
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.name = "nvram",
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.mode = S_IRUGO | S_IWUSR,
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},
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.size = TX4939_RTC_REG_RAMSIZE,
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.read = tx4939_rtc_nvram_read,
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.write = tx4939_rtc_nvram_write,
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};
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static int __init tx4939_rtc_probe(struct platform_device *pdev)
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{
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struct rtc_device *rtc;
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struct tx4939rtc_plat_data *pdata;
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struct resource *res;
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int irq, ret;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENODEV;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return -ENODEV;
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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platform_set_drvdata(pdev, pdata);
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if (!devm_request_mem_region(&pdev->dev, res->start,
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resource_size(res), pdev->name))
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return -EBUSY;
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pdata->rtcreg = devm_ioremap(&pdev->dev, res->start,
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resource_size(res));
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if (!pdata->rtcreg)
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return -EBUSY;
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tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP);
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if (devm_request_irq(&pdev->dev, irq, tx4939_rtc_interrupt,
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IRQF_DISABLED, pdev->name, &pdev->dev) < 0)
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return -EBUSY;
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rtc = rtc_device_register(pdev->name, &pdev->dev,
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&tx4939_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc))
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return PTR_ERR(rtc);
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pdata->rtc = rtc;
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ret = sysfs_create_bin_file(&pdev->dev.kobj, &tx4939_rtc_nvram_attr);
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if (ret)
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rtc_device_unregister(rtc);
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return ret;
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}
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static int __exit tx4939_rtc_remove(struct platform_device *pdev)
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{
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struct tx4939rtc_plat_data *pdata = platform_get_drvdata(pdev);
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struct rtc_device *rtc = pdata->rtc;
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spin_lock_irq(&rtc->irq_lock);
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tx4939_rtc_cmd(pdata->rtcreg, TX4939_RTCCTL_COMMAND_NOP);
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spin_unlock_irq(&rtc->irq_lock);
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sysfs_remove_bin_file(&pdev->dev.kobj, &tx4939_rtc_nvram_attr);
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rtc_device_unregister(rtc);
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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static struct platform_driver tx4939_rtc_driver = {
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.remove = __exit_p(tx4939_rtc_remove),
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.driver = {
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.name = "tx4939rtc",
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.owner = THIS_MODULE,
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},
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};
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static int __init tx4939rtc_init(void)
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{
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return platform_driver_probe(&tx4939_rtc_driver, tx4939_rtc_probe);
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}
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static void __exit tx4939rtc_exit(void)
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{
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platform_driver_unregister(&tx4939_rtc_driver);
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}
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module_init(tx4939rtc_init);
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module_exit(tx4939rtc_exit);
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MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
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MODULE_DESCRIPTION("TX4939 internal RTC driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:tx4939rtc");
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