diff options
Diffstat (limited to 'drivers/rtc/rtc-sa1100.c')
| -rw-r--r-- | drivers/rtc/rtc-sa1100.c | 174 |
1 files changed, 13 insertions, 161 deletions
diff --git a/drivers/rtc/rtc-sa1100.c b/drivers/rtc/rtc-sa1100.c index 88ea52b8647..0b40bb88a88 100644 --- a/drivers/rtc/rtc-sa1100.c +++ b/drivers/rtc/rtc-sa1100.c @@ -43,7 +43,6 @@ #define RTC_DEF_TRIM 0 static const unsigned long RTC_FREQ = 1024; -static unsigned long timer_freq; static struct rtc_time rtc_alarm; static DEFINE_SPINLOCK(sa1100_rtc_lock); @@ -156,114 +155,11 @@ static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id) return IRQ_HANDLED; } -static int sa1100_irq_set_freq(struct device *dev, int freq) -{ - if (freq < 1 || freq > timer_freq) { - return -EINVAL; - } else { - struct rtc_device *rtc = (struct rtc_device *)dev; - - rtc->irq_freq = freq; - - return 0; - } -} - -static int rtc_timer1_count; - -static int sa1100_irq_set_state(struct device *dev, int enabled) -{ - spin_lock_irq(&sa1100_rtc_lock); - if (enabled) { - struct rtc_device *rtc = (struct rtc_device *)dev; - - OSMR1 = timer_freq / rtc->irq_freq + OSCR; - OIER |= OIER_E1; - rtc_timer1_count = 1; - } else { - OIER &= ~OIER_E1; - } - spin_unlock_irq(&sa1100_rtc_lock); - - return 0; -} - -static inline int sa1100_timer1_retrigger(struct rtc_device *rtc) -{ - unsigned long diff; - unsigned long period = timer_freq / rtc->irq_freq; - - spin_lock_irq(&sa1100_rtc_lock); - - do { - OSMR1 += period; - diff = OSMR1 - OSCR; - /* If OSCR > OSMR1, diff is a very large number (unsigned - * math). This means we have a lost interrupt. */ - } while (diff > period); - OIER |= OIER_E1; - - spin_unlock_irq(&sa1100_rtc_lock); - - return 0; -} - -static irqreturn_t timer1_interrupt(int irq, void *dev_id) -{ - struct platform_device *pdev = to_platform_device(dev_id); - struct rtc_device *rtc = platform_get_drvdata(pdev); - - /* - * If we match for the first time, rtc_timer1_count will be 1. - * Otherwise, we wrapped around (very unlikely but - * still possible) so compute the amount of missed periods. - * The match reg is updated only when the data is actually retrieved - * to avoid unnecessary interrupts. - */ - OSSR = OSSR_M1; /* clear match on timer1 */ - - rtc_update_irq(rtc, rtc_timer1_count, RTC_PF | RTC_IRQF); - - if (rtc_timer1_count == 1) - rtc_timer1_count = - (rtc->irq_freq * ((1 << 30) / (timer_freq >> 2))); - - /* retrigger. */ - sa1100_timer1_retrigger(rtc); - - return IRQ_HANDLED; -} - -static int sa1100_rtc_read_callback(struct device *dev, int data) -{ - if (data & RTC_PF) { - struct rtc_device *rtc = (struct rtc_device *)dev; - - /* interpolate missed periods and set match for the next */ - unsigned long period = timer_freq / rtc->irq_freq; - unsigned long oscr = OSCR; - unsigned long osmr1 = OSMR1; - unsigned long missed = (oscr - osmr1)/period; - data += missed << 8; - OSSR = OSSR_M1; /* clear match on timer 1 */ - OSMR1 = osmr1 + (missed + 1)*period; - /* Ensure we didn't miss another match in the mean time. - * Here we compare (match - OSCR) 8 instead of 0 -- - * see comment in pxa_timer_interrupt() for explanation. - */ - while ((signed long)((osmr1 = OSMR1) - OSCR) <= 8) { - data += 0x100; - OSSR = OSSR_M1; /* clear match on timer 1 */ - OSMR1 = osmr1 + period; - } - } - return data; -} - static int sa1100_rtc_open(struct device *dev) { int ret; - struct rtc_device *rtc = (struct rtc_device *)dev; + struct platform_device *plat_dev = to_platform_device(dev); + struct rtc_device *rtc = platform_get_drvdata(plat_dev); ret = request_irq(IRQ_RTC1Hz, sa1100_rtc_interrupt, IRQF_DISABLED, "rtc 1Hz", dev); @@ -277,19 +173,11 @@ static int sa1100_rtc_open(struct device *dev) dev_err(dev, "IRQ %d already in use.\n", IRQ_RTCAlrm); goto fail_ai; } - ret = request_irq(IRQ_OST1, timer1_interrupt, IRQF_DISABLED, - "rtc timer", dev); - if (ret) { - dev_err(dev, "IRQ %d already in use.\n", IRQ_OST1); - goto fail_pi; - } rtc->max_user_freq = RTC_FREQ; - sa1100_irq_set_freq(dev, RTC_FREQ); + rtc_irq_set_freq(rtc, NULL, RTC_FREQ); return 0; - fail_pi: - free_irq(IRQ_RTCAlrm, dev); fail_ai: free_irq(IRQ_RTC1Hz, dev); fail_ui: @@ -304,38 +192,19 @@ static void sa1100_rtc_release(struct device *dev) OSSR = OSSR_M1; spin_unlock_irq(&sa1100_rtc_lock); - free_irq(IRQ_OST1, dev); free_irq(IRQ_RTCAlrm, dev); free_irq(IRQ_RTC1Hz, dev); } - -static int sa1100_rtc_ioctl(struct device *dev, unsigned int cmd, - unsigned long arg) +static int sa1100_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) { - switch (cmd) { - case RTC_AIE_OFF: - spin_lock_irq(&sa1100_rtc_lock); - RTSR &= ~RTSR_ALE; - spin_unlock_irq(&sa1100_rtc_lock); - return 0; - case RTC_AIE_ON: - spin_lock_irq(&sa1100_rtc_lock); + spin_lock_irq(&sa1100_rtc_lock); + if (enabled) RTSR |= RTSR_ALE; - spin_unlock_irq(&sa1100_rtc_lock); - return 0; - case RTC_UIE_OFF: - spin_lock_irq(&sa1100_rtc_lock); - RTSR &= ~RTSR_HZE; - spin_unlock_irq(&sa1100_rtc_lock); - return 0; - case RTC_UIE_ON: - spin_lock_irq(&sa1100_rtc_lock); - RTSR |= RTSR_HZE; - spin_unlock_irq(&sa1100_rtc_lock); - return 0; - } - return -ENOIOCTLCMD; + else + RTSR &= ~RTSR_ALE; + spin_unlock_irq(&sa1100_rtc_lock); + return 0; } static int sa1100_rtc_read_time(struct device *dev, struct rtc_time *tm) @@ -385,39 +254,27 @@ static int sa1100_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) static int sa1100_rtc_proc(struct device *dev, struct seq_file *seq) { - struct rtc_device *rtc = (struct rtc_device *)dev; - - seq_printf(seq, "trim/divider\t: 0x%08x\n", (u32) RTTR); - seq_printf(seq, "update_IRQ\t: %s\n", - (RTSR & RTSR_HZE) ? "yes" : "no"); - seq_printf(seq, "periodic_IRQ\t: %s\n", - (OIER & OIER_E1) ? "yes" : "no"); - seq_printf(seq, "periodic_freq\t: %d\n", rtc->irq_freq); - seq_printf(seq, "RTSR\t\t: 0x%08x\n", (u32)RTSR); + seq_printf(seq, "trim/divider\t\t: 0x%08x\n", (u32) RTTR); + seq_printf(seq, "RTSR\t\t\t: 0x%08x\n", (u32)RTSR); return 0; } static const struct rtc_class_ops sa1100_rtc_ops = { .open = sa1100_rtc_open, - .read_callback = sa1100_rtc_read_callback, .release = sa1100_rtc_release, - .ioctl = sa1100_rtc_ioctl, .read_time = sa1100_rtc_read_time, .set_time = sa1100_rtc_set_time, .read_alarm = sa1100_rtc_read_alarm, .set_alarm = sa1100_rtc_set_alarm, .proc = sa1100_rtc_proc, - .irq_set_freq = sa1100_irq_set_freq, - .irq_set_state = sa1100_irq_set_state, + .alarm_irq_enable = sa1100_rtc_alarm_irq_enable, }; static int sa1100_rtc_probe(struct platform_device *pdev) { struct rtc_device *rtc; - timer_freq = get_clock_tick_rate(); - /* * According to the manual we should be able to let RTTR be zero * and then a default diviser for a 32.768KHz clock is used. @@ -443,11 +300,6 @@ static int sa1100_rtc_probe(struct platform_device *pdev) platform_set_drvdata(pdev, rtc); - /* Set the irq_freq */ - /*TODO: Find out who is messing with this value after we initialize - * it here.*/ - rtc->irq_freq = RTC_FREQ; - /* Fix for a nasty initialization problem the in SA11xx RTSR register. * See also the comments in sa1100_rtc_interrupt(). * |