#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/io.h>
+#include <linux/log2.h>
#include <asm/rtc.h>
#define DRV_NAME "sh-rtc"
-#define DRV_VERSION "0.2.0"
+#define DRV_VERSION "0.2.1"
#define RTC_REG(r) ((r) * rtc_reg_size)
unsigned short periodic_freq;
};
-static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
+static int __sh_rtc_interrupt(struct sh_rtc *rtc)
{
- struct sh_rtc *rtc = dev_id;
- unsigned int tmp;
-
- spin_lock(&rtc->lock);
+ unsigned int tmp, pending;
tmp = readb(rtc->regbase + RCR1);
+ pending = tmp & RCR1_CF;
tmp &= ~RCR1_CF;
writeb(tmp, rtc->regbase + RCR1);
/* Users have requested One x Second IRQ */
- if (rtc->periodic_freq & PF_OXS)
+ if (pending && rtc->periodic_freq & PF_OXS)
rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
- spin_unlock(&rtc->lock);
-
- return IRQ_HANDLED;
+ return pending;
}
-static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
+static int __sh_rtc_alarm(struct sh_rtc *rtc)
{
- struct sh_rtc *rtc = dev_id;
- unsigned int tmp;
-
- spin_lock(&rtc->lock);
+ unsigned int tmp, pending;
tmp = readb(rtc->regbase + RCR1);
+ pending = tmp & RCR1_AF;
tmp &= ~(RCR1_AF | RCR1_AIE);
- writeb(tmp, rtc->regbase + RCR1);
-
- rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
+ writeb(tmp, rtc->regbase + RCR1);
- spin_unlock(&rtc->lock);
+ if (pending)
+ rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
- return IRQ_HANDLED;
+ return pending;
}
-static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
+static int __sh_rtc_periodic(struct sh_rtc *rtc)
{
- struct sh_rtc *rtc = dev_id;
struct rtc_device *rtc_dev = rtc->rtc_dev;
- unsigned int tmp;
-
- spin_lock(&rtc->lock);
+ struct rtc_task *irq_task;
+ unsigned int tmp, pending;
tmp = readb(rtc->regbase + RCR2);
+ pending = tmp & RCR2_PEF;
tmp &= ~RCR2_PEF;
writeb(tmp, rtc->regbase + RCR2);
+ if (!pending)
+ return 0;
+
/* Half period enabled than one skipped and the next notified */
if ((rtc->periodic_freq & PF_HP) && (rtc->periodic_freq & PF_COUNT))
rtc->periodic_freq &= ~PF_COUNT;
rtc->periodic_freq |= PF_COUNT;
if (rtc->periodic_freq & PF_KOU) {
spin_lock(&rtc_dev->irq_task_lock);
- if (rtc_dev->irq_task)
- rtc_dev->irq_task->func(rtc_dev->irq_task->private_data);
+ irq_task = rtc_dev->irq_task;
+ if (irq_task)
+ irq_task->func(irq_task->private_data);
spin_unlock(&rtc_dev->irq_task_lock);
} else
rtc_update_irq(rtc->rtc_dev, 1, RTC_PF | RTC_IRQF);
}
+ return pending;
+}
+
+static irqreturn_t sh_rtc_interrupt(int irq, void *dev_id)
+{
+ struct sh_rtc *rtc = dev_id;
+ int ret;
+
+ spin_lock(&rtc->lock);
+ ret = __sh_rtc_interrupt(rtc);
+ spin_unlock(&rtc->lock);
+
+ return IRQ_RETVAL(ret);
+}
+
+static irqreturn_t sh_rtc_alarm(int irq, void *dev_id)
+{
+ struct sh_rtc *rtc = dev_id;
+ int ret;
+
+ spin_lock(&rtc->lock);
+ ret = __sh_rtc_alarm(rtc);
+ spin_unlock(&rtc->lock);
+
+ return IRQ_RETVAL(ret);
+}
+
+static irqreturn_t sh_rtc_periodic(int irq, void *dev_id)
+{
+ struct sh_rtc *rtc = dev_id;
+ int ret;
+
+ spin_lock(&rtc->lock);
+ ret = __sh_rtc_periodic(rtc);
+ spin_unlock(&rtc->lock);
+
+ return IRQ_RETVAL(ret);
+}
+
+static irqreturn_t sh_rtc_shared(int irq, void *dev_id)
+{
+ struct sh_rtc *rtc = dev_id;
+ int ret;
+
+ spin_lock(&rtc->lock);
+ ret = __sh_rtc_interrupt(rtc);
+ ret |= __sh_rtc_alarm(rtc);
+ ret |= __sh_rtc_periodic(rtc);
spin_unlock(&rtc->lock);
- return IRQ_HANDLED;
+ return IRQ_RETVAL(ret);
}
static inline void sh_rtc_setpie(struct device *dev, unsigned int enable)
return 0;
}
+static inline void sh_rtc_setcie(struct device *dev, unsigned int enable)
+{
+ struct sh_rtc *rtc = dev_get_drvdata(dev);
+ unsigned int tmp;
+
+ spin_lock_irq(&rtc->lock);
+
+ tmp = readb(rtc->regbase + RCR1);
+
+ if (!enable)
+ tmp &= ~RCR1_CIE;
+ else
+ tmp |= RCR1_CIE;
+
+ writeb(tmp, rtc->regbase + RCR1);
+
+ spin_unlock_irq(&rtc->lock);
+}
+
static int sh_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
{
struct sh_rtc *rtc = dev_get_drvdata(dev);
break;
case RTC_UIE_OFF:
rtc->periodic_freq &= ~PF_OXS;
+ sh_rtc_setcie(dev, 0);
break;
case RTC_UIE_ON:
rtc->periodic_freq |= PF_OXS;
+ sh_rtc_setcie(dev, 1);
break;
case RTC_IRQP_READ:
ret = put_user(rtc->rtc_dev->irq_freq,
tm->tm_sec--;
#endif
+ /* only keep the carry interrupt enabled if UIE is on */
+ if (!(rtc->periodic_freq & PF_OXS))
+ sh_rtc_setcie(dev, 0);
+
dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
"mday=%d, mon=%d, year=%d, wday=%d\n",
__func__,
tm->tm_sec, tm->tm_min, tm->tm_hour,
tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday);
- if (rtc_valid_tm(tm) < 0) {
- dev_err(dev, "invalid date\n");
- rtc_time_to_tm(0, tm);
- }
-
- return 0;
+ return rtc_valid_tm(tm);
}
static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm)
static int sh_rtc_irq_set_freq(struct device *dev, int freq)
{
+ if (!is_power_of_2(freq))
+ return -EINVAL;
return sh_rtc_ioctl(dev, RTC_IRQP_SET, freq);
}
{
struct sh_rtc *rtc;
struct resource *res;
- unsigned int tmp;
+ struct rtc_time r;
int ret;
rtc = kzalloc(sizeof(struct sh_rtc), GFP_KERNEL);
ret = platform_get_irq(pdev, 0);
if (unlikely(ret <= 0)) {
ret = -ENOENT;
- dev_err(&pdev->dev, "No IRQ for period\n");
+ dev_err(&pdev->dev, "No IRQ resource\n");
goto err_badres;
}
rtc->periodic_irq = ret;
-
- ret = platform_get_irq(pdev, 1);
- if (unlikely(ret <= 0)) {
- ret = -ENOENT;
- dev_err(&pdev->dev, "No IRQ for carry\n");
- goto err_badres;
- }
- rtc->carry_irq = ret;
-
- ret = platform_get_irq(pdev, 2);
- if (unlikely(ret <= 0)) {
- ret = -ENOENT;
- dev_err(&pdev->dev, "No IRQ for alarm\n");
- goto err_badres;
- }
- rtc->alarm_irq = ret;
+ rtc->carry_irq = platform_get_irq(pdev, 1);
+ rtc->alarm_irq = platform_get_irq(pdev, 2);
res = platform_get_resource(pdev, IORESOURCE_IO, 0);
if (unlikely(res == NULL)) {
}
rtc->rtc_dev->max_user_freq = 256;
- rtc->rtc_dev->irq_freq = 1;
- rtc->periodic_freq = 0x60;
platform_set_drvdata(pdev, rtc);
- /* register periodic/carry/alarm irqs */
- ret = request_irq(rtc->periodic_irq, sh_rtc_periodic, IRQF_DISABLED,
- "sh-rtc period", rtc);
- if (unlikely(ret)) {
- dev_err(&pdev->dev,
- "request period IRQ failed with %d, IRQ %d\n", ret,
- rtc->periodic_irq);
- goto err_unmap;
- }
+ if (rtc->carry_irq <= 0) {
+ /* register shared periodic/carry/alarm irq */
+ ret = request_irq(rtc->periodic_irq, sh_rtc_shared,
+ IRQF_DISABLED, "sh-rtc", rtc);
+ if (unlikely(ret)) {
+ dev_err(&pdev->dev,
+ "request IRQ failed with %d, IRQ %d\n", ret,
+ rtc->periodic_irq);
+ goto err_unmap;
+ }
+ } else {
+ /* register periodic/carry/alarm irqs */
+ ret = request_irq(rtc->periodic_irq, sh_rtc_periodic,
+ IRQF_DISABLED, "sh-rtc period", rtc);
+ if (unlikely(ret)) {
+ dev_err(&pdev->dev,
+ "request period IRQ failed with %d, IRQ %d\n",
+ ret, rtc->periodic_irq);
+ goto err_unmap;
+ }
- ret = request_irq(rtc->carry_irq, sh_rtc_interrupt, IRQF_DISABLED,
- "sh-rtc carry", rtc);
- if (unlikely(ret)) {
- dev_err(&pdev->dev,
- "request carry IRQ failed with %d, IRQ %d\n", ret,
- rtc->carry_irq);
- free_irq(rtc->periodic_irq, rtc);
- goto err_unmap;
- }
+ ret = request_irq(rtc->carry_irq, sh_rtc_interrupt,
+ IRQF_DISABLED, "sh-rtc carry", rtc);
+ if (unlikely(ret)) {
+ dev_err(&pdev->dev,
+ "request carry IRQ failed with %d, IRQ %d\n",
+ ret, rtc->carry_irq);
+ free_irq(rtc->periodic_irq, rtc);
+ goto err_unmap;
+ }
- ret = request_irq(rtc->alarm_irq, sh_rtc_alarm, IRQF_DISABLED,
- "sh-rtc alarm", rtc);
- if (unlikely(ret)) {
- dev_err(&pdev->dev,
- "request alarm IRQ failed with %d, IRQ %d\n", ret,
- rtc->alarm_irq);
- free_irq(rtc->carry_irq, rtc);
- free_irq(rtc->periodic_irq, rtc);
- goto err_unmap;
+ ret = request_irq(rtc->alarm_irq, sh_rtc_alarm,
+ IRQF_DISABLED, "sh-rtc alarm", rtc);
+ if (unlikely(ret)) {
+ dev_err(&pdev->dev,
+ "request alarm IRQ failed with %d, IRQ %d\n",
+ ret, rtc->alarm_irq);
+ free_irq(rtc->carry_irq, rtc);
+ free_irq(rtc->periodic_irq, rtc);
+ goto err_unmap;
+ }
}
- tmp = readb(rtc->regbase + RCR1);
- tmp &= ~RCR1_CF;
- tmp |= RCR1_CIE;
- writeb(tmp, rtc->regbase + RCR1);
+ /* everything disabled by default */
+ rtc->periodic_freq = 0;
+ rtc->rtc_dev->irq_freq = 0;
+ sh_rtc_setpie(&pdev->dev, 0);
+ sh_rtc_setaie(&pdev->dev, 0);
+ sh_rtc_setcie(&pdev->dev, 0);
+
+ /* reset rtc to epoch 0 if time is invalid */
+ if (rtc_read_time(rtc->rtc_dev, &r) < 0) {
+ rtc_time_to_tm(0, &r);
+ rtc_set_time(rtc->rtc_dev, &r);
+ }
return 0;
sh_rtc_setpie(&pdev->dev, 0);
sh_rtc_setaie(&pdev->dev, 0);
+ sh_rtc_setcie(&pdev->dev, 0);
- free_irq(rtc->carry_irq, rtc);
free_irq(rtc->periodic_irq, rtc);
- free_irq(rtc->alarm_irq, rtc);
+ if (rtc->carry_irq > 0) {
+ free_irq(rtc->carry_irq, rtc);
+ free_irq(rtc->alarm_irq, rtc);
+ }
release_resource(rtc->res);
projects / linux-2.6-omap-h63xx.git / blobdiff