aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/rtc
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/Kconfig12
-rw-r--r--drivers/rtc/Makefile1
-rw-r--r--drivers/rtc/class.c13
-rw-r--r--drivers/rtc/interface.c574
-rw-r--r--drivers/rtc/rtc-dev.c104
-rw-r--r--drivers/rtc/rtc-ds1305.c2
-rw-r--r--drivers/rtc/rtc-ds1307.c12
-rw-r--r--drivers/rtc/rtc-ds1374.c2
-rw-r--r--drivers/rtc/rtc-ds3232.c2
-rw-r--r--drivers/rtc/rtc-lib.c28
-rw-r--r--drivers/rtc/rtc-mrst.c582
-rw-r--r--drivers/rtc/rtc-rx8025.c2
-rw-r--r--drivers/rtc/rtc-sa1100.c161
13 files changed, 1122 insertions, 373 deletions
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 2883428..4941cad 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -463,6 +463,18 @@ config RTC_DRV_CMOS
This driver can also be built as a module. If so, the module
will be called rtc-cmos.
+config RTC_DRV_VRTC
+ tristate "Virtual RTC for Moorestown platforms"
+ depends on X86_MRST
+ default y if X86_MRST
+
+ help
+ Say "yes" here to get direct support for the real time clock
+ found on Moorestown platforms. The VRTC is a emulated RTC that
+ derives its clock source from a real RTC in the PMIC. The MC146818
+ style programming interface is mostly conserved, but any
+ updates are done via IPC calls to the system controller FW.
+
config RTC_DRV_DS1216
tristate "Dallas DS1216"
depends on SNI_RM
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 4c2832d..2afdaf3 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -30,6 +30,7 @@ obj-$(CONFIG_RTC_DRV_CMOS) += rtc-cmos.o
obj-$(CONFIG_RTC_DRV_COH901331) += rtc-coh901331.o
obj-$(CONFIG_RTC_DRV_DAVINCI) += rtc-davinci.o
obj-$(CONFIG_RTC_DRV_DM355EVM) += rtc-dm355evm.o
+obj-$(CONFIG_RTC_DRV_VRTC) += rtc-mrst.o
obj-$(CONFIG_RTC_DRV_DS1216) += rtc-ds1216.o
obj-$(CONFIG_RTC_DRV_DS1286) += rtc-ds1286.o
obj-$(CONFIG_RTC_DRV_DS1302) += rtc-ds1302.o
diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index e6539cb..9583cbc 100644
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -16,6 +16,7 @@
#include <linux/kdev_t.h>
#include <linux/idr.h>
#include <linux/slab.h>
+#include <linux/workqueue.h>
#include "rtc-core.h"
@@ -152,6 +153,18 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev,
spin_lock_init(&rtc->irq_task_lock);
init_waitqueue_head(&rtc->irq_queue);
+ /* Init timerqueue */
+ timerqueue_init_head(&rtc->timerqueue);
+ INIT_WORK(&rtc->irqwork, rtc_timer_do_work);
+ /* Init aie timer */
+ rtc_timer_init(&rtc->aie_timer, rtc_aie_update_irq, (void *)rtc);
+ /* Init uie timer */
+ rtc_timer_init(&rtc->uie_rtctimer, rtc_uie_update_irq, (void *)rtc);
+ /* Init pie timer */
+ hrtimer_init(&rtc->pie_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ rtc->pie_timer.function = rtc_pie_update_irq;
+ rtc->pie_enabled = 0;
+
strlcpy(rtc->name, name, RTC_DEVICE_NAME_SIZE);
dev_set_name(&rtc->dev, "rtc%d", id);
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index a0c8162..90384b9 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -14,15 +14,11 @@
#include <linux/rtc.h>
#include <linux/sched.h>
#include <linux/log2.h>
+#include <linux/workqueue.h>
-int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm)
+static int __rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm)
{
int err;
-
- err = mutex_lock_interruptible(&rtc->ops_lock);
- if (err)
- return err;
-
if (!rtc->ops)
err = -ENODEV;
else if (!rtc->ops->read_time)
@@ -31,7 +27,18 @@ int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm)
memset(tm, 0, sizeof(struct rtc_time));
err = rtc->ops->read_time(rtc->dev.parent, tm);
}
+ return err;
+}
+
+int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm)
+{
+ int err;
+ err = mutex_lock_interruptible(&rtc->ops_lock);
+ if (err)
+ return err;
+
+ err = __rtc_read_time(rtc, tm);
mutex_unlock(&rtc->ops_lock);
return err;
}
@@ -106,188 +113,54 @@ int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs)
}
EXPORT_SYMBOL_GPL(rtc_set_mmss);
-static int rtc_read_alarm_internal(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
+int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
{
int err;
err = mutex_lock_interruptible(&rtc->ops_lock);
if (err)
return err;
-
- if (rtc->ops == NULL)
- err = -ENODEV;
- else if (!rtc->ops->read_alarm)
- err = -EINVAL;
- else {
- memset(alarm, 0, sizeof(struct rtc_wkalrm));
- err = rtc->ops->read_alarm(rtc->dev.parent, alarm);
- }
-
+ alarm->enabled = rtc->aie_timer.enabled;
+ if (alarm->enabled)
+ alarm->time = rtc_ktime_to_tm(rtc->aie_timer.node.expires);
mutex_unlock(&rtc->ops_lock);
- return err;
+
+ return 0;
}
+EXPORT_SYMBOL_GPL(rtc_read_alarm);
-int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
+int __rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
{
+ struct rtc_time tm;
+ long now, scheduled;
int err;
- struct rtc_time before, now;
- int first_time = 1;
- unsigned long t_now, t_alm;
- enum { none, day, month, year } missing = none;
- unsigned days;
-
- /* The lower level RTC driver may return -1 in some fields,
- * creating invalid alarm->time values, for reasons like:
- *
- * - The hardware may not be capable of filling them in;
- * many alarms match only on time-of-day fields, not
- * day/month/year calendar data.
- *
- * - Some hardware uses illegal values as "wildcard" match
- * values, which non-Linux firmware (like a BIOS) may try
- * to set up as e.g. "alarm 15 minutes after each hour".
- * Linux uses only oneshot alarms.
- *
- * When we see that here, we deal with it by using values from
- * a current RTC timestamp for any missing (-1) values. The
- * RTC driver prevents "periodic alarm" modes.
- *
- * But this can be racey, because some fields of the RTC timestamp
- * may have wrapped in the interval since we read the RTC alarm,
- * which would lead to us inserting inconsistent values in place
- * of the -1 fields.
- *
- * Reading the alarm and timestamp in the reverse sequence
- * would have the same race condition, and not solve the issue.
- *
- * So, we must first read the RTC timestamp,
- * then read the RTC alarm value,
- * and then read a second RTC timestamp.
- *
- * If any fields of the second timestamp have changed
- * when compared with the first timestamp, then we know
- * our timestamp may be inconsistent with that used by
- * the low-level rtc_read_alarm_internal() function.
- *
- * So, when the two timestamps disagree, we just loop and do
- * the process again to get a fully consistent set of values.
- *
- * This could all instead be done in the lower level driver,
- * but since more than one lower level RTC implementation needs it,
- * then it's probably best best to do it here instead of there..
- */
- /* Get the "before" timestamp */
- err = rtc_read_time(rtc, &before);
- if (err < 0)
+ err = rtc_valid_tm(&alarm->time);
+ if (err)
return err;
- do {
- if (!first_time)
- memcpy(&before, &now, sizeof(struct rtc_time));
- first_time = 0;
-
- /* get the RTC alarm values, which may be incomplete */
- err = rtc_read_alarm_internal(rtc, alarm);
- if (err)
- return err;
- if (!alarm->enabled)
- return 0;
-
- /* full-function RTCs won't have such missing fields */
- if (rtc_valid_tm(&alarm->time) == 0)
- return 0;
-
- /* get the "after" timestamp, to detect wrapped fields */
- err = rtc_read_time(rtc, &now);
- if (err < 0)
- return err;
-
- /* note that tm_sec is a "don't care" value here: */
- } while ( before.tm_min != now.tm_min
- || before.tm_hour != now.tm_hour
- || before.tm_mon != now.tm_mon
- || before.tm_year != now.tm_year);
-
- /* Fill in the missing alarm fields using the timestamp; we
- * know there's at least one since alarm->time is invalid.
- */
- if (alarm->time.tm_sec == -1)
- alarm->time.tm_sec = now.tm_sec;
- if (alarm->time.tm_min == -1)
- alarm->time.tm_min = now.tm_min;
- if (alarm->time.tm_hour == -1)
- alarm->time.tm_hour = now.tm_hour;
-
- /* For simplicity, only support date rollover for now */
- if (alarm->time.tm_mday == -1) {
- alarm->time.tm_mday = now.tm_mday;
- missing = day;
- }
- if (alarm->time.tm_mon == -1) {
- alarm->time.tm_mon = now.tm_mon;
- if (missing == none)
- missing = month;
- }
- if (alarm->time.tm_year == -1) {
- alarm->time.tm_year = now.tm_year;
- if (missing == none)
- missing = year;
- }
-
- /* with luck, no rollover is needed */
- rtc_tm_to_time(&now, &t_now);
- rtc_tm_to_time(&alarm->time, &t_alm);
- if (t_now < t_alm)
- goto done;
-
- switch (missing) {
+ rtc_tm_to_time(&alarm->time, &scheduled);
- /* 24 hour rollover ... if it's now 10am Monday, an alarm that
- * that will trigger at 5am will do so at 5am Tuesday, which
- * could also be in the next month or year. This is a common
- * case, especially for PCs.
- */
- case day:
- dev_dbg(&rtc->dev, "alarm rollover: %s\n", "day");
- t_alm += 24 * 60 * 60;
- rtc_time_to_tm(t_alm, &alarm->time);
- break;
-
- /* Month rollover ... if it's the 31th, an alarm on the 3rd will
- * be next month. An alarm matching on the 30th, 29th, or 28th
- * may end up in the month after that! Many newer PCs support
- * this type of alarm.
+ /* Make sure we're not setting alarms in the past */
+ err = __rtc_read_time(rtc, &tm);
+ rtc_tm_to_time(&tm, &now);
+ if (scheduled <= now)
+ return -ETIME;
+ /*
+ * XXX - We just checked to make sure the alarm time is not
+ * in the past, but there is still a race window where if
+ * the is alarm set for the next second and the second ticks
+ * over right here, before we set the alarm.
*/
- case month:
- dev_dbg(&rtc->dev, "alarm rollover: %s\n", "month");
- do {
- if (alarm->time.tm_mon < 11)
- alarm->time.tm_mon++;
- else {
- alarm->time.tm_mon = 0;
- alarm->time.tm_year++;
- }
- days = rtc_month_days(alarm->time.tm_mon,
- alarm->time.tm_year);
- } while (days < alarm->time.tm_mday);
- break;
-
- /* Year rollover ... easy except for leap years! */
- case year:
- dev_dbg(&rtc->dev, "alarm rollover: %s\n", "year");
- do {
- alarm->time.tm_year++;
- } while (rtc_valid_tm(&alarm->time) != 0);
- break;
-
- default:
- dev_warn(&rtc->dev, "alarm rollover not handled\n");
- }
-done:
- return 0;
+ if (!rtc->ops)
+ err = -ENODEV;
+ else if (!rtc->ops->set_alarm)
+ err = -EINVAL;
+ else
+ err = rtc->ops->set_alarm(rtc->dev.parent, alarm);
+
+ return err;
}
-EXPORT_SYMBOL_GPL(rtc_read_alarm);
int rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
{
@@ -300,16 +173,18 @@ int rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
err = mutex_lock_interruptible(&rtc->ops_lock);
if (err)
return err;
-
- if (!rtc->ops)
- err = -ENODEV;
- else if (!rtc->ops->set_alarm)
- err = -EINVAL;
- else
- err = rtc->ops->set_alarm(rtc->dev.parent, alarm);
-
+ if (rtc->aie_timer.enabled) {
+ rtc_timer_remove(rtc, &rtc->aie_timer);
+ rtc->aie_timer.enabled = 0;
+ }
+ rtc->aie_timer.node.expires = rtc_tm_to_ktime(alarm->time);
+ rtc->aie_timer.period = ktime_set(0, 0);
+ if (alarm->enabled) {
+ rtc->aie_timer.enabled = 1;
+ rtc_timer_enqueue(rtc, &rtc->aie_timer);
+ }
mutex_unlock(&rtc->ops_lock);
- return err;
+ return 0;
}
EXPORT_SYMBOL_GPL(rtc_set_alarm);
@@ -319,6 +194,16 @@ int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled)
if (err)
return err;
+ if (rtc->aie_timer.enabled != enabled) {
+ if (enabled) {
+ rtc->aie_timer.enabled = 1;
+ rtc_timer_enqueue(rtc, &rtc->aie_timer);
+ } else {
+ rtc_timer_remove(rtc, &rtc->aie_timer);
+ rtc->aie_timer.enabled = 0;
+ }
+ }
+
if (!rtc->ops)
err = -ENODEV;
else if (!rtc->ops->alarm_irq_enable)
@@ -337,52 +222,53 @@ int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled)
if (err)
return err;
-#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
- if (enabled == 0 && rtc->uie_irq_active) {
- mutex_unlock(&rtc->ops_lock);
- return rtc_dev_update_irq_enable_emul(rtc, enabled);
+ /* make sure we're changing state */
+ if (rtc->uie_rtctimer.enabled == enabled)
+ goto out;
+
+ if (enabled) {
+ struct rtc_time tm;
+ ktime_t now, onesec;
+
+ __rtc_read_time(rtc, &tm);
+ onesec = ktime_set(1, 0);
+ now = rtc_tm_to_ktime(tm);
+ rtc->uie_rtctimer.node.expires = ktime_add(now, onesec);
+ rtc->uie_rtctimer.period = ktime_set(1, 0);
+ rtc->uie_rtctimer.enabled = 1;
+ rtc_timer_enqueue(rtc, &rtc->uie_rtctimer);
+ } else {
+ rtc_timer_remove(rtc, &rtc->uie_rtctimer);
+ rtc->uie_rtctimer.enabled = 0;
}
-#endif
-
- if (!rtc->ops)
- err = -ENODEV;
- else if (!rtc->ops->update_irq_enable)
- err = -EINVAL;
- else
- err = rtc->ops->update_irq_enable(rtc->dev.parent, enabled);
+out:
mutex_unlock(&rtc->ops_lock);
-
-#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
- /*
- * Enable emulation if the driver did not provide
- * the update_irq_enable function pointer or if returned
- * -EINVAL to signal that it has been configured without
- * interrupts or that are not available at the moment.
- */
- if (err == -EINVAL)
- err = rtc_dev_update_irq_enable_emul(rtc, enabled);
-#endif
return err;
+
}
EXPORT_SYMBOL_GPL(rtc_update_irq_enable);
+
/**
- * rtc_update_irq - report RTC periodic, alarm, and/or update irqs
- * @rtc: the rtc device
- * @num: how many irqs are being reported (usually one)
- * @events: mask of RTC_IRQF with one or more of RTC_PF, RTC_AF, RTC_UF
- * Context: any
+ * rtc_handle_legacy_irq - AIE, UIE and PIE event hook
+ * @rtc: pointer to the rtc device
+ *
+ * This function is called when an AIE, UIE or PIE mode interrupt
+ * has occured (or been emulated).
+ *
+ * Triggers the registered irq_task function callback.
*/
-void rtc_update_irq(struct rtc_device *rtc,
- unsigned long num, unsigned long events)
+static void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode)
{
unsigned long flags;
+ /* mark one irq of the appropriate mode */
spin_lock_irqsave(&rtc->irq_lock, flags);
- rtc->irq_data = (rtc->irq_data + (num << 8)) | events;
+ rtc->irq_data = (rtc->irq_data + (num << 8)) | (RTC_IRQF|mode);
spin_unlock_irqrestore(&rtc->irq_lock, flags);
+ /* call the task func */
spin_lock_irqsave(&rtc->irq_task_lock, flags);
if (rtc->irq_task)
rtc->irq_task->func(rtc->irq_task->private_data);
@@ -391,6 +277,69 @@ void rtc_update_irq(struct rtc_device *rtc,
wake_up_interruptible(&rtc->irq_queue);
kill_fasync(&rtc->async_queue, SIGIO, POLL_IN);
}
+
+
+/**
+ * rtc_aie_update_irq - AIE mode rtctimer hook
+ * @private: pointer to the rtc_device
+ *
+ * This functions is called when the aie_timer expires.
+ */
+void rtc_aie_update_irq(void *private)
+{
+ struct rtc_device *rtc = (struct rtc_device *)private;
+ rtc_handle_legacy_irq(rtc, 1, RTC_AF);
+}
+
+
+/**
+ * rtc_uie_update_irq - UIE mode rtctimer hook
+ * @private: pointer to the rtc_device
+ *
+ * This functions is called when the uie_timer expires.
+ */
+void rtc_uie_update_irq(void *private)
+{
+ struct rtc_device *rtc = (struct rtc_device *)private;
+ rtc_handle_legacy_irq(rtc, 1, RTC_UF);
+}
+
+
+/**
+ * rtc_pie_update_irq - PIE mode hrtimer hook
+ * @timer: pointer to the pie mode hrtimer
+ *
+ * This function is used to emulate PIE mode interrupts
+ * using an hrtimer. This function is called when the periodic
+ * hrtimer expires.
+ */
+enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer)
+{
+ struct rtc_device *rtc;
+ ktime_t period;
+ int count;
+ rtc = container_of(timer, struct rtc_device, pie_timer);
+
+ period = ktime_set(0, NSEC_PER_SEC/rtc->irq_freq);
+ count = hrtimer_forward_now(timer, period);
+
+ rtc_handle_legacy_irq(rtc, count, RTC_PF);
+
+ return HRTIMER_RESTART;
+}
+
+/**
+ * rtc_update_irq - Triggered when a RTC interrupt occurs.
+ * @rtc: the rtc device
+ * @num: how many irqs are being reported (usually one)
+ * @events: mask of RTC_IRQF with one or more of RTC_PF, RTC_AF, RTC_UF
+ * Context: any
+ */
+void rtc_update_irq(struct rtc_device *rtc,
+ unsigned long num, unsigned long events)
+{
+ schedule_work(&rtc->irqwork);
+}
EXPORT_SYMBOL_GPL(rtc_update_irq);
static int __rtc_match(struct device *dev, void *data)
@@ -477,18 +426,20 @@ int rtc_irq_set_state(struct rtc_device *rtc, struct rtc_task *task, int enabled
int err = 0;
unsigned long flags;
- if (rtc->ops->irq_set_state == NULL)
- return -ENXIO;
-
spin_lock_irqsave(&rtc->irq_task_lock, flags);
if (rtc->irq_task != NULL && task == NULL)
err = -EBUSY;
if (rtc->irq_task != task)
err = -EACCES;
- spin_unlock_irqrestore(&rtc->irq_task_lock, flags);
- if (err == 0)
- err = rtc->ops->irq_set_state(rtc->dev.parent, enabled);
+ if (enabled) {
+ ktime_t period = ktime_set(0, NSEC_PER_SEC/rtc->irq_freq);
+ hrtimer_start(&rtc->pie_timer, period, HRTIMER_MODE_REL);
+ } else {
+ hrtimer_cancel(&rtc->pie_timer);
+ }
+ rtc->pie_enabled = enabled;
+ spin_unlock_irqrestore(&rtc->irq_task_lock, flags);
return err;
}
@@ -509,21 +460,194 @@ int rtc_irq_set_freq(struct rtc_device *rtc, struct rtc_task *task, int freq)
int err = 0;
unsigned long flags;
- if (rtc->ops->irq_set_freq == NULL)
- return -ENXIO;
-
spin_lock_irqsave(&rtc->irq_task_lock, flags);
if (rtc->irq_task != NULL && task == NULL)
err = -EBUSY;
if (rtc->irq_task != task)
err = -EACCES;
- spin_unlock_irqrestore(&rtc->irq_task_lock, flags);
-
if (err == 0) {
- err = rtc->ops->irq_set_freq(rtc->dev.parent, freq);
- if (err == 0)
- rtc->irq_freq = freq;
+ rtc->irq_freq = freq;
+ if (rtc->pie_enabled) {
+ ktime_t period;
+ hrtimer_cancel(&rtc->pie_timer);
+ period = ktime_set(0, NSEC_PER_SEC/rtc->irq_freq);
+ hrtimer_start(&rtc->pie_timer, period,
+ HRTIMER_MODE_REL);
+ }
}
+ spin_unlock_irqrestore(&rtc->irq_task_lock, flags);
return err;
}
EXPORT_SYMBOL_GPL(rtc_irq_set_freq);
+
+/**
+ * rtc_timer_enqueue - Adds a rtc_timer to the rtc_device timerqueue
+ * @rtc rtc device
+ * @timer timer being added.
+ *
+ * Enqueues a timer onto the rtc devices timerqueue and sets
+ * the next alarm event appropriately.
+ *
+ * Must hold ops_lock for proper serialization of timerqueue
+ */
+void rtc_timer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer)
+{
+ timerqueue_add(&rtc->timerqueue, &timer->node);
+ if (&timer->node == timerqueue_getnext(&rtc->timerqueue)) {
+ struct rtc_wkalrm alarm;
+ int err;
+ alarm.time = rtc_ktime_to_tm(timer->node.expires);
+ alarm.enabled = 1;
+ err = __rtc_set_alarm(rtc, &alarm);
+ if (err == -ETIME)
+ schedule_work(&rtc->irqwork);
+ }
+}
+
+/**
+ * rtc_timer_remove - Removes a rtc_timer from the rtc_device timerqueue
+ * @rtc rtc device
+ * @timer timer being removed.
+ *
+ * Removes a timer onto the rtc devices timerqueue and sets
+ * the next alarm event appropriately.
+ *
+ * Must hold ops_lock for proper serialization of timerqueue
+ */
+void rtc_timer_remove(struct rtc_device *rtc, struct rtc_timer *timer)
+{
+ struct timerqueue_node *next = timerqueue_getnext(&rtc->timerqueue);
+ timerqueue_del(&rtc->timerqueue, &timer->node);
+
+ if (next == &timer->node) {
+ struct rtc_wkalrm alarm;
+ int err;
+ next = timerqueue_getnext(&rtc->timerqueue);
+ if (!next)
+ return;
+ alarm.time = rtc_ktime_to_tm(next->expires);
+ alarm.enabled = 1;
+ err = __rtc_set_alarm(rtc, &alarm);
+ if (err == -ETIME)
+ schedule_work(&rtc->irqwork);
+ }
+}
+
+/**
+ * rtc_timer_do_work - Expires rtc timers
+ * @rtc rtc device
+ * @timer timer being removed.
+ *
+ * Expires rtc timers. Reprograms next alarm event if needed.
+ * Called via worktask.
+ *
+ * Serializes access to timerqueue via ops_lock mutex
+ */
+void rtc_timer_do_work(struct work_struct *work)
+{
+ struct rtc_timer *timer;
+ struct timerqueue_node *next;
+ ktime_t now;
+ struct rtc_time tm;
+
+ struct rtc_device *rtc =
+ container_of(work, struct rtc_device, irqwork);
+
+ mutex_lock(&rtc->ops_lock);
+again:
+ __rtc_read_time(rtc, &tm);
+ now = rtc_tm_to_ktime(tm);
+ while ((next = timerqueue_getnext(&rtc->timerqueue))) {
+ if (next->expires.tv64 > now.tv64)
+ break;
+
+ /* expire timer */
+ timer = container_of(next, struct rtc_timer, node);
+ timerqueue_del(&rtc->timerqueue, &timer->node);
+ timer->enabled = 0;
+ if (timer->task.func)
+ timer->task.func(timer->task.private_data);
+
+ /* Re-add/fwd periodic timers */
+ if (ktime_to_ns(timer->period)) {
+ timer->node.expires = ktime_add(timer->node.expires,
+ timer->period);
+ timer->enabled = 1;
+ timerqueue_add(&rtc->timerqueue, &timer->node);
+ }
+ }
+
+ /* Set next alarm */
+ if (next) {
+ struct rtc_wkalrm alarm;
+ int err;
+ alarm.time = rtc_ktime_to_tm(next->expires);
+ alarm.enabled = 1;
+ err = __rtc_set_alarm(rtc, &alarm);
+ if (err == -ETIME)
+ goto again;
+ }
+
+ mutex_unlock(&rtc->ops_lock);
+}
+
+
+/* rtc_timer_init - Initializes an rtc_timer
+ * @timer: timer to be intiialized
+ * @f: function pointer to be called when timer fires
+ * @data: private data passed to function pointer
+ *
+ * Kernel interface to initializing an rtc_timer.
+ */
+void rtc_timer_init(struct rtc_timer *timer, void (*f)(void* p), void* data)
+{
+ timerqueue_init(&timer->node);
+ timer->enabled = 0;
+ timer->task.func = f;
+ timer->task.private_data = data;
+}
+
+/* rtc_timer_start - Sets an rtc_timer to fire in the future
+ * @ rtc: rtc device to be used
+ * @ timer: timer being set
+ * @ expires: time at which to expire the timer
+ * @ period: period that the timer will recur
+ *
+ * Kernel interface to set an rtc_timer
+ */
+int rtc_timer_start(struct rtc_device *rtc, struct rtc_timer* timer,
+ ktime_t expires, ktime_t period)
+{
+ int ret = 0;
+ mutex_lock(&rtc->ops_lock);
+ if (timer->enabled)
+ rtc_timer_remove(rtc, timer);
+
+ timer->node.expires = expires;
+ timer->period = period;
+
+ timer->enabled = 1;
+ rtc_timer_enqueue(rtc, timer);
+
+ mutex_unlock(&rtc->ops_lock);
+ return ret;
+}
+
+/* rtc_timer_cancel - Stops an rtc_timer
+ * @ rtc: rtc device to be used
+ * @ timer: timer being set
+ *
+ * Kernel interface to cancel an rtc_timer
+ */
+int rtc_timer_cancel(struct rtc_device *rtc, struct rtc_timer* timer)
+{
+ int ret = 0;
+ mutex_lock(&rtc->ops_lock);
+ if (timer->enabled)
+ rtc_timer_remove(rtc, timer);
+ timer->enabled = 0;
+ mutex_unlock(&rtc->ops_lock);
+ return ret;
+}
+
+
diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c
index 62227cd..212b16e 100644
--- a/drivers/rtc/rtc-dev.c
+++ b/drivers/rtc/rtc-dev.c
@@ -46,105 +46,6 @@ static int rtc_dev_open(struct inode *inode, struct file *file)
return err;
}
-#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
-/*
- * Routine to poll RTC seconds field for change as often as possible,
- * after first RTC_UIE use timer to reduce polling
- */
-static void rtc_uie_task(struct work_struct *work)
-{
- struct rtc_device *rtc =
- container_of(work, struct rtc_device, uie_task);
- struct rtc_time tm;
- int num = 0;
- int err;
-
- err = rtc_read_time(rtc, &tm);
-
- spin_lock_irq(&rtc->irq_lock);
- if (rtc->stop_uie_polling || err) {
- rtc->uie_task_active = 0;
- } else if (rtc->oldsecs != tm.tm_sec) {
- num = (tm.tm_sec + 60 - rtc->oldsecs) % 60;
- rtc->oldsecs = tm.tm_sec;
- rtc->uie_timer.expires = jiffies + HZ - (HZ/10);
- rtc->uie_timer_active = 1;
- rtc->uie_task_active = 0;
- add_timer(&rtc->uie_timer);
- } else if (schedule_work(&rtc->uie_task) == 0) {
- rtc->uie_task_active = 0;
- }
- spin_unlock_irq(&rtc->irq_lock);
- if (num)
- rtc_update_irq(rtc, num, RTC_UF | RTC_IRQF);
-}
-static void rtc_uie_timer(unsigned long data)
-{
- struct rtc_device *rtc = (struct rtc_device *)data;
- unsigned long flags;
-
- spin_lock_irqsave(&rtc->irq_lock, flags);
- rtc->uie_timer_active = 0;
- rtc->uie_task_active = 1;
- if ((schedule_work(&rtc->uie_task) == 0))
- rtc->uie_task_active = 0;
- spin_unlock_irqrestore(&rtc->irq_lock, flags);
-}
-
-static int clear_uie(struct rtc_device *rtc)
-{
- spin_lock_irq(&rtc->irq_lock);
- if (rtc->uie_irq_active) {
- rtc->stop_uie_polling = 1;
- if (rtc->uie_timer_active) {
- spin_unlock_irq(&rtc->irq_lock);
- del_timer_sync(&rtc->uie_timer);
- spin_lock_irq(&rtc->irq_lock);
- rtc->uie_timer_active = 0;
- }
- if (rtc->uie_task_active) {
- spin_unlock_irq(&rtc->irq_lock);
- flush_scheduled_work();
- spin_lock_irq(&rtc->irq_lock);
- }
- rtc->uie_irq_active = 0;
- }
- spin_unlock_irq(&rtc->irq_lock);
- return 0;
-}
-
-static int set_uie(struct rtc_device *rtc)
-{
- struct rtc_time tm;
- int err;
-
- err = rtc_read_time(rtc, &tm);
- if (err)
- return err;
- spin_lock_irq(&rtc->irq_lock);
- if (!rtc->uie_irq_active) {
- rtc->uie_irq_active = 1;
- rtc->stop_uie_polling = 0;
- rtc->oldsecs = tm.tm_sec;
- rtc->uie_task_active = 1;
- if (schedule_work(&rtc->uie_task) == 0)
- rtc->uie_task_active = 0;
- }
- rtc->irq_data = 0;
- spin_unlock_irq(&rtc->irq_lock);
- return 0;
-}
-
-int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc, unsigned int enabled)
-{
- if (enabled)
- return set_uie(rtc);
- else
- return clear_uie(rtc);
-}
-EXPORT_SYMBOL(rtc_dev_update_irq_enable_emul);
-
-#endif /* CONFIG_RTC_INTF_DEV_UIE_EMUL */
static ssize_t
rtc_dev_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
@@ -493,11 +394,6 @@ void rtc_dev_prepare(struct rtc_device *rtc)
rtc->dev.devt = MKDEV(MAJOR(rtc_devt), rtc->id);
-#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
- INIT_WORK(&rtc->uie_task, rtc_uie_task);
- setup_timer(&rtc->uie_timer, rtc_uie_timer, (unsigned long)rtc);
-#endif
-
cdev_init(&rtc->char_dev, &rtc_dev_fops);
rtc->char_dev.owner = rtc->owner;
}
diff --git a/drivers/rtc/rtc-ds1305.c b/drivers/rtc/rtc-ds1305.c
index 48da85e..077af1d 100644
--- a/drivers/rtc/rtc-ds1305.c
+++ b/drivers/rtc/rtc-ds1305.c
@@ -813,7 +813,7 @@ static int __devexit ds1305_remove(struct spi_device *spi)
if (spi->irq) {
set_bit(FLAG_EXITING, &ds1305->flags);
free_irq(spi->irq, ds1305);
- flush_scheduled_work();
+ cancel_work_sync(&ds1305->work);
}
rtc_device_unregister(ds1305->rtc);
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index d827ce5..0d559b6 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -106,9 +106,9 @@ struct ds1307 {
struct i2c_client *client;
struct rtc_device *rtc;
struct work_struct work;
- s32 (*read_block_data)(struct i2c_client *client, u8 command,
+ s32 (*read_block_data)(const struct i2c_client *client, u8 command,
u8 length, u8 *values);
- s32 (*write_block_data)(struct i2c_client *client, u8 command,
+ s32 (*write_block_data)(const struct i2c_client *client, u8 command,
u8 length, const u8 *values);
};
@@ -158,8 +158,8 @@ MODULE_DEVICE_TABLE(i2c, ds1307_id);
#define BLOCK_DATA_MAX_TRIES 10
-static s32 ds1307_read_block_data_once(struct i2c_client *client, u8 command,
- u8 length, u8 *values)
+static s32 ds1307_read_block_data_once(const struct i2c_client *client,
+ u8 command, u8 length, u8 *values)
{
s32 i, data;
@@ -172,7 +172,7 @@ static s32 ds1307_read_block_data_once(struct i2c_client *client, u8 command,
return i;
}
-static s32 ds1307_read_block_data(struct i2c_client *client, u8 command,
+static s32 ds1307_read_block_data(const struct i2c_client *client, u8 command,
u8 length, u8 *values)
{
u8 oldvalues[I2C_SMBUS_BLOCK_MAX];
@@ -198,7 +198,7 @@ static s32 ds1307_read_block_data(struct i2c_client *client, u8 command,
return length;
}
-static s32 ds1307_write_block_data(struct i2c_client *client, u8 command,
+static s32 ds1307_write_block_data(const struct i2c_client *client, u8 command,
u8 length, const u8 *values)
{
u8 currvalues[I2C_SMBUS_BLOCK_MAX];
diff --git a/drivers/rtc/rtc-ds1374.c b/drivers/rtc/rtc-ds1374.c
index 1f0007f..47fb635 100644
--- a/drivers/rtc/rtc-ds1374.c
+++ b/drivers/rtc/rtc-ds1374.c
@@ -417,7 +417,7 @@ static int __devexit ds1374_remove(struct i2c_client *client)
mutex_unlock(&ds1374->mutex);
free_irq(client->irq, client);
- flush_scheduled_work();
+ cancel_work_sync(&ds1374->work);
}
rtc_device_unregister(ds1374->rtc);
diff --git a/drivers/rtc/rtc-ds3232.c b/drivers/rtc/rtc-ds3232.c
index 5706355..23a9ee1 100644
--- a/drivers/rtc/rtc-ds3232.c
+++ b/drivers/rtc/rtc-ds3232.c
@@ -463,7 +463,7 @@ static int __devexit ds3232_remove(struct i2c_client *client)
mutex_unlock(&ds3232->mutex);
free_irq(client->irq, client);
- flush_scheduled_work();
+ cancel_work_sync(&ds3232->work);
}
rtc_device_unregister(ds3232->rtc);
diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c
index 773851f..075f170 100644
--- a/drivers/rtc/rtc-lib.c
+++ b/drivers/rtc/rtc-lib.c
@@ -117,4 +117,32 @@ int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time)
}
EXPORT_SYMBOL(rtc_tm_to_time);
+/*
+ * Convert rtc_time to ktime
+ */
+ktime_t rtc_tm_to_ktime(struct rtc_time tm)
+{
+ time_t time;
+ rtc_tm_to_time(&tm, &time);
+ return ktime_set(time, 0);
+}
+EXPORT_SYMBOL_GPL(rtc_tm_to_ktime);
+
+/*
+ * Convert ktime to rtc_time
+ */
+struct rtc_time rtc_ktime_to_tm(ktime_t kt)
+{
+ struct timespec ts;
+ struct rtc_time ret;
+
+ ts = ktime_to_timespec(kt);
+ /* Round up any ns */
+ if (ts.tv_nsec)
+ ts.tv_sec++;
+ rtc_time_to_tm(ts.tv_sec, &ret);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(rtc_ktime_to_tm);
+
MODULE_LICENSE("GPL");
diff --git a/drivers/rtc/rtc-mrst.c b/drivers/rtc/rtc-mrst.c
new file mode 100644
index 0000000..bcd0cf6
--- /dev/null
+++ b/drivers/rtc/rtc-mrst.c
@@ -0,0 +1,582 @@
+/*
+ * rtc-mrst.c: Driver for Moorestown virtual RTC
+ *
+ * (C) Copyright 2009 Intel Corporation
+ * Author: Jacob Pan (jacob.jun.pan@intel.com)
+ * Feng Tang (feng.tang@intel.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; version 2
+ * of the License.
+ *
+ * Note:
+ * VRTC is emulated by system controller firmware, the real HW
+ * RTC is located in the PMIC device. SCU FW shadows PMIC RTC
+ * in a memory mapped IO space that is visible to the host IA
+ * processor.
+ *
+ * This driver is based upon drivers/rtc/rtc-cmos.c
+ */
+
+/*
+ * Note:
+ * * vRTC only supports binary mode and 24H mode
+ * * vRTC only support PIE and AIE, no UIE, and its PIE only happens
+ * at 23:59:59pm everyday, no support for adjustable frequency
+ * * Alarm function is also limited to hr/min/sec.
+ */
+
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sfi.h>
+
+#include <asm-generic/rtc.h>
+#include <asm/intel_scu_ipc.h>
+#include <asm/mrst.h>
+#include <asm/mrst-vrtc.h>
+
+struct mrst_rtc {
+ struct rtc_device *rtc;
+ struct device *dev;
+ int irq;
+ struct resource *iomem;
+
+ u8 enabled_wake;
+ u8 suspend_ctrl;
+};
+
+static const char driver_name[] = "rtc_mrst";
+
+#define RTC_IRQMASK (RTC_PF | RTC_AF)
+
+static inline int is_intr(u8 rtc_intr)
+{
+ if (!(rtc_intr & RTC_IRQF))
+ return 0;
+ return rtc_intr & RTC_IRQMASK;
+}
+
+/*
+ * rtc_time's year contains the increment over 1900, but vRTC's YEAR
+ * register can't be programmed to value larger than 0x64, so vRTC
+ * driver chose to use 1960 (1970 is UNIX time start point) as the base,
+ * and does the translation at read/write time.
+ *
+ * Why not just use 1970 as the offset? it's because using 1960 will
+ * make it consistent in leap year setting for both vrtc and low-level
+ * physical rtc devices.
+ */
+static int mrst_read_time(struct device *dev, struct rtc_time *time)
+{
+ unsigned long flags;
+
+ if (rtc_is_updating())
+ mdelay(20);
+
+ spin_lock_irqsave(&rtc_lock, flags);
+ time->tm_sec = vrtc_cmos_read(RTC_SECONDS);
+ time->tm_min = vrtc_cmos_read(RTC_MINUTES);
+ time->tm_hour = vrtc_cmos_read(RTC_HOURS);
+ time->tm_mday = vrtc_cmos_read(RTC_DAY_OF_MONTH);
+ time->tm_mon = vrtc_cmos_read(RTC_MONTH);
+ time->tm_year = vrtc_cmos_read(RTC_YEAR);
+ spin_unlock_irqrestore(&rtc_lock, flags);
+
+ /* Adjust for the 1960/1900 */
+ time->tm_year += 60;
+ time->tm_mon--;
+ return RTC_24H;
+}
+
+static int mrst_set_time(struct device *dev, struct rtc_time *time)
+{
+ int ret;
+ unsigned long flags;
+ unsigned char mon, day, hrs, min, sec;
+ unsigned int yrs;
+
+ yrs = time->tm_year;
+ mon = time->tm_mon + 1; /* tm_mon starts at zero */
+ day = time->tm_mday;
+ hrs = time->tm_hour;
+ min = time->tm_min;
+ sec = time->tm_sec;
+
+ if (yrs < 70 || yrs > 138)
+ return -EINVAL;
+ yrs -= 60;
+
+ spin_lock_irqsave(&rtc_lock, flags);
+
+ vrtc_cmos_write(yrs, RTC_YEAR);
+ vrtc_cmos_write(mon, RTC_MONTH);
+ vrtc_cmos_write(day, RTC_DAY_OF_MONTH);
+ vrtc_cmos_write(hrs, RTC_HOURS);
+ vrtc_cmos_write(min, RTC_MINUTES);
+ vrtc_cmos_write(sec, RTC_SECONDS);
+
+ spin_unlock_irqrestore(&rtc_lock, flags);
+
+ ret = intel_scu_ipc_simple_command(IPCMSG_VRTC, IPC_CMD_VRTC_SETTIME);
+ return ret;
+}
+
+static int mrst_read_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+ struct mrst_rtc *mrst = dev_get_drvdata(dev);
+ unsigned char rtc_control;
+
+ if (mrst->irq <= 0)
+ return -EIO;
+
+ /* Basic alarms only support hour, minute, and seconds fields.
+ * Some also support day and month, for alarms up to a year in
+ * the future.
+ */
+ t->time.tm_mday = -1;
+ t->time.tm_mon = -1;
+ t->time.tm_year = -1;
+
+ /* vRTC only supports binary mode */
+ spin_lock_irq(&rtc_lock);
+ t->time.tm_sec = vrtc_cmos_read(RTC_SECONDS_ALARM);
+ t->time.tm_min = vrtc_cmos_read(RTC_MINUTES_ALARM);
+ t->time.tm_hour = vrtc_cmos_read(RTC_HOURS_ALARM);
+
+ rtc_control = vrtc_cmos_read(RTC_CONTROL);
+ spin_unlock_irq(&rtc_lock);
+
+ t->enabled = !!(rtc_control & RTC_AIE);
+ t->pending = 0;
+
+ return 0;
+}
+
+static void mrst_checkintr(struct mrst_rtc *mrst, unsigned char rtc_control)
+{
+ unsigned char rtc_intr;
+
+ /*
+ * NOTE after changing RTC_xIE bits we always read INTR_FLAGS;
+ * allegedly some older rtcs need that to handle irqs properly
+ */
+ rtc_intr = vrtc_cmos_read(RTC_INTR_FLAGS);
+ rtc_intr &= (rtc_control & RTC_IRQMASK) | RTC_IRQF;
+ if (is_intr(rtc_intr))
+ rtc_update_irq(mrst->rtc, 1, rtc_intr);
+}
+
+static void mrst_irq_enable(struct mrst_rtc *mrst, unsigned char mask)
+{
+ unsigned char rtc_control;
+
+ /*
+ * Flush any pending IRQ status, notably for update irqs,
+ * before we enable new IRQs
+ */
+ rtc_control = vrtc_cmos_read(RTC_CONTROL);
+ mrst_checkintr(mrst, rtc_control);
+
+ rtc_control |= mask;
+ vrtc_cmos_write(rtc_control, RTC_CONTROL);
+
+ mrst_checkintr(mrst, rtc_control);
+}
+
+static void mrst_irq_disable(struct mrst_rtc *mrst, unsigned char mask)
+{
+ unsigned char rtc_control;
+
+ rtc_control = vrtc_cmos_read(RTC_CONTROL);
+ rtc_control &= ~mask;
+ vrtc_cmos_write(rtc_control, RTC_CONTROL);
+ mrst_checkintr(mrst, rtc_control);
+}
+
+static int mrst_set_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+ struct mrst_rtc *mrst = dev_get_drvdata(dev);
+ unsigned char hrs, min, sec;
+ int ret = 0;
+
+ if (!mrst->irq)
+ return -EIO;
+
+ hrs = t->time.tm_hour;
+ min = t->time.tm_min;
+ sec = t->time.tm_sec;
+
+ spin_lock_irq(&rtc_lock);
+ /* Next rtc irq must not be from previous alarm setting */
+ mrst_irq_disable(mrst, RTC_AIE);
+
+ /* Update alarm */
+ vrtc_cmos_write(hrs, RTC_HOURS_ALARM);
+ vrtc_cmos_write(min, RTC_MINUTES_ALARM);
+ vrtc_cmos_write(sec, RTC_SECONDS_ALARM);
+
+ spin_unlock_irq(&rtc_lock);
+
+ ret = intel_scu_ipc_simple_command(IPCMSG_VRTC, IPC_CMD_VRTC_SETALARM);
+ if (ret)
+ return ret;
+
+ spin_lock_irq(&rtc_lock);
+ if (t->enabled)
+ mrst_irq_enable(mrst, RTC_AIE);
+
+ spin_unlock_irq(&rtc_lock);
+
+ return 0;
+}
+
+static int mrst_irq_set_state(struct device *dev, int enabled)
+{
+ struct mrst_rtc *mrst = dev_get_drvdata(dev);
+ unsigned long flags;
+
+ if (!mrst->irq)
+ return -ENXIO;
+
+ spin_lock_irqsave(&rtc_lock, flags);
+
+ if (enabled)
+ mrst_irq_enable(mrst, RTC_PIE);
+ else
+ mrst_irq_disable(mrst, RTC_PIE);
+
+ spin_unlock_irqrestore(&rtc_lock, flags);
+ return 0;
+}
+
+#if defined(CONFIG_RTC_INTF_DEV) || defined(CONFIG_RTC_INTF_DEV_MODULE)
+
+/* Currently, the vRTC doesn't support UIE ON/OFF */
+static int
+mrst_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
+{
+ struct mrst_rtc *mrst = dev_get_drvdata(dev);
+ unsigned long flags;
+
+ switch (cmd) {
+ case RTC_AIE_OFF:
+ case RTC_AIE_ON:
+ if (!mrst->irq)
+ return -EINVAL;
+ break;
+ default:
+ /* PIE ON/OFF is handled by mrst_irq_set_state() */
+ return -ENOIOCTLCMD;
+ }
+
+ spin_lock_irqsave(&rtc_lock, flags);
+ switch (cmd) {
+ case RTC_AIE_OFF: /* alarm off */
+ mrst_irq_disable(mrst, RTC_AIE);
+ break;
+ case RTC_AIE_ON: /* alarm on */
+ mrst_irq_enable(mrst, RTC_AIE);
+ break;
+ }
+ spin_unlock_irqrestore(&rtc_lock, flags);
+ return 0;
+}
+
+#else
+#define mrst_rtc_ioctl NULL
+#endif
+
+#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
+
+static int mrst_procfs(struct device *dev, struct seq_file *seq)
+{
+ unsigned char rtc_control, valid;
+
+ spin_lock_irq(&rtc_lock);
+ rtc_control = vrtc_cmos_read(RTC_CONTROL);
+ valid = vrtc_cmos_read(RTC_VALID);
+ spin_unlock_irq(&rtc_lock);
+
+ return seq_printf(seq,
+ "periodic_IRQ\t: %s\n"
+ "alarm\t\t: %s\n"
+ "BCD\t\t: no\n"
+ "periodic_freq\t: daily (not adjustable)\n",
+ (rtc_control & RTC_PIE) ? "on" : "off",
+ (rtc_control & RTC_AIE) ? "on" : "off");
+}
+
+#else
+#define mrst_procfs NULL
+#endif
+
+static const struct rtc_class_ops mrst_rtc_ops = {
+ .ioctl = mrst_rtc_ioctl,
+ .read_time = mrst_read_time,
+ .set_time = mrst_set_time,
+ .read_alarm = mrst_read_alarm,
+ .set_alarm = mrst_set_alarm,
+ .proc = mrst_procfs,
+ .irq_set_state = mrst_irq_set_state,
+};
+
+static struct mrst_rtc mrst_rtc;
+
+/*
+ * When vRTC IRQ is captured by SCU FW, FW will clear the AIE bit in
+ * Reg B, so no need for this driver to clear it
+ */
+static irqreturn_t mrst_rtc_irq(int irq, void *p)
+{
+ u8 irqstat;
+
+ spin_lock(&rtc_lock);
+ /* This read will clear all IRQ flags inside Reg C */
+ irqstat = vrtc_cmos_read(RTC_INTR_FLAGS);
+ spin_unlock(&rtc_lock);
+
+ irqstat &= RTC_IRQMASK | RTC_IRQF;
+ if (is_intr(irqstat)) {
+ rtc_update_irq(p, 1, irqstat);
+ return IRQ_HANDLED;
+ }
+ return IRQ_NONE;
+}
+
+static int __init
+vrtc_mrst_do_probe(struct device *dev, struct resource *iomem, int rtc_irq)
+{
+ int retval = 0;
+ unsigned char rtc_control;
+
+ /* There can be only one ... */
+ if (mrst_rtc.dev)
+ return -EBUSY;
+
+ if (!iomem)
+ return -ENODEV;
+
+ iomem = request_mem_region(iomem->start,
+ iomem->end + 1 - iomem->start,
+ driver_name);
+ if (!iomem) {
+ dev_dbg(dev, "i/o mem already in use.\n");
+ return -EBUSY;
+ }
+
+ mrst_rtc.irq = rtc_irq;
+ mrst_rtc.iomem = iomem;
+
+ mrst_rtc.rtc = rtc_device_register(driver_name, dev,
+ &mrst_rtc_ops, THIS_MODULE);
+ if (IS_ERR(mrst_rtc.rtc)) {
+ retval = PTR_ERR(mrst_rtc.rtc);
+ goto cleanup0;
+ }
+
+ mrst_rtc.dev = dev;
+ dev_set_drvdata(dev, &mrst_rtc);
+ rename_region(iomem, dev_name(&mrst_rtc.rtc->dev));
+
+ spin_lock_irq(&rtc_lock);
+ mrst_irq_disable(&mrst_rtc, RTC_PIE | RTC_AIE);
+ rtc_control = vrtc_cmos_read(RTC_CONTROL);
+ spin_unlock_irq(&rtc_lock);
+
+ if (!(rtc_control & RTC_24H) || (rtc_control & (RTC_DM_BINARY)))
+ dev_dbg(dev, "TODO: support more than 24-hr BCD mode\n");
+
+ if (rtc_irq) {
+ retval = request_irq(rtc_irq, mrst_rtc_irq,
+ IRQF_DISABLED, dev_name(&mrst_rtc.rtc->dev),
+ mrst_rtc.rtc);
+ if (retval < 0) {
+ dev_dbg(dev, "IRQ %d is already in use, err %d\n",
+ rtc_irq, retval);
+ goto cleanup1;
+ }
+ }
+ dev_dbg(dev, "initialised\n");
+ return 0;
+
+cleanup1:
+ mrst_rtc.dev = NULL;
+ rtc_device_unregister(mrst_rtc.rtc);
+cleanup0:
+ release_region(iomem->start, iomem->end + 1 - iomem->start);
+ dev_err(dev, "rtc-mrst: unable to initialise\n");
+ return retval;
+}
+
+static void rtc_mrst_do_shutdown(void)
+{
+ spin_lock_irq(&rtc_lock);
+ mrst_irq_disable(&mrst_rtc, RTC_IRQMASK);
+ spin_unlock_irq(&rtc_lock);
+}
+
+static void __exit rtc_mrst_do_remove(struct device *dev)
+{
+ struct mrst_rtc *mrst = dev_get_drvdata(dev);
+ struct resource *iomem;
+
+ rtc_mrst_do_shutdown();
+
+ if (mrst->irq)
+ free_irq(mrst->irq, mrst->rtc);
+
+ rtc_device_unregister(mrst->rtc);
+ mrst->rtc = NULL;
+
+ iomem = mrst->iomem;
+ release_region(iomem->start, iomem->end + 1 - iomem->start);
+ mrst->iomem = NULL;
+
+ mrst->dev = NULL;
+ dev_set_drvdata(dev, NULL);
+}
+
+#ifdef CONFIG_PM
+static int mrst_suspend(struct device *dev, pm_message_t mesg)
+{
+ struct mrst_rtc *mrst = dev_get_drvdata(dev);
+ unsigned char tmp;
+
+ /* Only the alarm might be a wakeup event source */
+ spin_lock_irq(&rtc_lock);
+ mrst->suspend_ctrl = tmp = vrtc_cmos_read(RTC_CONTROL);
+ if (tmp & (RTC_PIE | RTC_AIE)) {
+ unsigned char mask;
+
+ if (device_may_wakeup(dev))
+ mask = RTC_IRQMASK & ~RTC_AIE;
+ else
+ mask = RTC_IRQMASK;
+ tmp &= ~mask;
+ vrtc_cmos_write(tmp, RTC_CONTROL);
+
+ mrst_checkintr(mrst, tmp);
+ }
+ spin_unlock_irq(&rtc_lock);
+
+ if (tmp & RTC_AIE) {
+ mrst->enabled_wake = 1;
+ enable_irq_wake(mrst->irq);
+ }
+
+ dev_dbg(&mrst_rtc.rtc->dev, "suspend%s, ctrl %02x\n",
+ (tmp & RTC_AIE) ? ", alarm may wake" : "",
+ tmp);
+
+ return 0;
+}
+
+/*
+ * We want RTC alarms to wake us from the deep power saving state
+ */
+static inline int mrst_poweroff(struct device *dev)
+{
+ return mrst_suspend(dev, PMSG_HIBERNATE);
+}
+
+static int mrst_resume(struct device *dev)
+{
+ struct mrst_rtc *mrst = dev_get_drvdata(dev);
+ unsigned char tmp = mrst->suspend_ctrl;
+
+ /* Re-enable any irqs previously active */
+ if (tmp & RTC_IRQMASK) {
+ unsigned char mask;
+
+ if (mrst->enabled_wake) {
+ disable_irq_wake(mrst->irq);
+ mrst->enabled_wake = 0;
+ }
+
+ spin_lock_irq(&rtc_lock);
+ do {
+ vrtc_cmos_write(tmp, RTC_CONTROL);
+
+ mask = vrtc_cmos_read(RTC_INTR_FLAGS);
+ mask &= (tmp & RTC_IRQMASK) | RTC_IRQF;
+ if (!is_intr(mask))
+ break;
+
+ rtc_update_irq(mrst->rtc, 1, mask);
+ tmp &= ~RTC_AIE;
+ } while (mask & RTC_AIE);
+ spin_unlock_irq(&rtc_lock);
+ }
+
+ dev_dbg(&mrst_rtc.rtc->dev, "resume, ctrl %02x\n", tmp);
+
+ return 0;
+}
+
+#else
+#define mrst_suspend NULL
+#define mrst_resume NULL
+
+static inline int mrst_poweroff(struct device *dev)
+{
+ return -ENOSYS;
+}
+
+#endif
+
+static int __init vrtc_mrst_platform_probe(struct platform_device *pdev)
+{
+ return vrtc_mrst_do_probe(&pdev->dev,
+ platform_get_resource(pdev, IORESOURCE_MEM, 0),
+ platform_get_irq(pdev, 0));
+}
+
+static int __exit vrtc_mrst_platform_remove(struct platform_device *pdev)
+{
+ rtc_mrst_do_remove(&pdev->dev);
+ return 0;
+}
+
+static void vrtc_mrst_platform_shutdown(struct platform_device *pdev)
+{
+ if (system_state == SYSTEM_POWER_OFF && !mrst_poweroff(&pdev->dev))
+ return;
+
+ rtc_mrst_do_shutdown();
+}
+
+MODULE_ALIAS("platform:vrtc_mrst");
+
+static struct platform_driver vrtc_mrst_platform_driver = {
+ .probe = vrtc_mrst_platform_probe,
+ .remove = __exit_p(vrtc_mrst_platform_remove),
+ .shutdown = vrtc_mrst_platform_shutdown,
+ .driver = {
+ .name = (char *) driver_name,
+ .suspend = mrst_suspend,
+ .resume = mrst_resume,
+ }
+};
+
+static int __init vrtc_mrst_init(void)
+{
+ return platform_driver_register(&vrtc_mrst_platform_driver);
+}
+
+static void __exit vrtc_mrst_exit(void)
+{
+ platform_driver_unregister(&vrtc_mrst_platform_driver);
+}
+
+module_init(vrtc_mrst_init);
+module_exit(vrtc_mrst_exit);
+
+MODULE_AUTHOR("Jacob Pan; Feng Tang");
+MODULE_DESCRIPTION("Driver for Moorestown virtual RTC");
+MODULE_LICENSE("GPL");
diff --git a/drivers/rtc/rtc-rx8025.c b/drivers/rtc/rtc-rx8025.c
index 1146e35..af32a62 100644
--- a/drivers/rtc/rtc-rx8025.c
+++ b/drivers/rtc/rtc-rx8025.c
@@ -650,7 +650,7 @@ static int __devexit rx8025_remove(struct i2c_client *client)
mutex_unlock(lock);
free_irq(client->irq, client);
- flush_scheduled_work();
+ cancel_work_sync(&rx8025->work);
}
rx8025_sysfs_unregister(&client->dev);
diff --git a/drivers/rtc/rtc-sa1100.c b/drivers/rtc/rtc-sa1100.c
index e4a44b6..88ea52b 100644
--- a/drivers/rtc/rtc-sa1100.c
+++ b/drivers/rtc/rtc-sa1100.c
@@ -39,10 +39,10 @@
#include <mach/regs-ost.h>
#endif
-#define RTC_DEF_DIVIDER 32768 - 1
+#define RTC_DEF_DIVIDER (32768 - 1)
#define RTC_DEF_TRIM 0
-static unsigned long rtc_freq = 1024;
+static const unsigned long RTC_FREQ = 1024;
static unsigned long timer_freq;
static struct rtc_time rtc_alarm;
static DEFINE_SPINLOCK(sa1100_rtc_lock);
@@ -61,7 +61,8 @@ static inline int rtc_periodic_alarm(struct rtc_time *tm)
* Calculate the next alarm time given the requested alarm time mask
* and the current time.
*/
-static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now, struct rtc_time *alrm)
+static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now,
+ struct rtc_time *alrm)
{
unsigned long next_time;
unsigned long now_time;
@@ -116,7 +117,23 @@ static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id)
rtsr = RTSR;
/* clear interrupt sources */
RTSR = 0;
- RTSR = (RTSR_AL | RTSR_HZ) & (rtsr >> 2);
+ /* Fix for a nasty initialization problem the in SA11xx RTSR register.
+ * See also the comments in sa1100_rtc_probe(). */
+ if (rtsr & (RTSR_ALE | RTSR_HZE)) {
+ /* This is the original code, before there was the if test
+ * above. This code does not clear interrupts that were not
+ * enabled. */
+ RTSR = (RTSR_AL | RTSR_HZ) & (rtsr >> 2);
+ } else {
+ /* For some reason, it is possible to enter this routine
+ * without interruptions enabled, it has been tested with
+ * several units (Bug in SA11xx chip?).
+ *
+ * This situation leads to an infinite "loop" of interrupt
+ * routine calling and as a result the processor seems to
+ * lock on its first call to open(). */
+ RTSR = RTSR_AL | RTSR_HZ;
+ }
/* clear alarm interrupt if it has occurred */
if (rtsr & RTSR_AL)
@@ -139,8 +156,58 @@ 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);
@@ -158,7 +225,11 @@ static irqreturn_t timer1_interrupt(int irq, void *dev_id)
rtc_update_irq(rtc, rtc_timer1_count, RTC_PF | RTC_IRQF);
if (rtc_timer1_count == 1)
- rtc_timer1_count = (rtc_freq * ((1 << 30) / (timer_freq >> 2)));
+ rtc_timer1_count =
+ (rtc->irq_freq * ((1 << 30) / (timer_freq >> 2)));
+
+ /* retrigger. */
+ sa1100_timer1_retrigger(rtc);
return IRQ_HANDLED;
}
@@ -166,8 +237,10 @@ static irqreturn_t timer1_interrupt(int irq, void *dev_id)
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_freq;
+ unsigned long period = timer_freq / rtc->irq_freq;
unsigned long oscr = OSCR;
unsigned long osmr1 = OSMR1;
unsigned long missed = (oscr - osmr1)/period;
@@ -178,7 +251,7 @@ static int sa1100_rtc_read_callback(struct device *dev, int data)
* Here we compare (match - OSCR) 8 instead of 0 --
* see comment in pxa_timer_interrupt() for explanation.
*/
- while( (signed long)((osmr1 = OSMR1) - OSCR) <= 8 ) {
+ while ((signed long)((osmr1 = OSMR1) - OSCR) <= 8) {
data += 0x100;
OSSR = OSSR_M1; /* clear match on timer 1 */
OSMR1 = osmr1 + period;
@@ -190,25 +263,29 @@ static int sa1100_rtc_read_callback(struct device *dev, int data)
static int sa1100_rtc_open(struct device *dev)
{
int ret;
+ struct rtc_device *rtc = (struct rtc_device *)dev;
ret = request_irq(IRQ_RTC1Hz, sa1100_rtc_interrupt, IRQF_DISABLED,
- "rtc 1Hz", dev);
+ "rtc 1Hz", dev);
if (ret) {
dev_err(dev, "IRQ %d already in use.\n", IRQ_RTC1Hz);
goto fail_ui;
}
ret = request_irq(IRQ_RTCAlrm, sa1100_rtc_interrupt, IRQF_DISABLED,
- "rtc Alrm", dev);
+ "rtc Alrm", dev);
if (ret) {
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);
+ "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);
+
return 0;
fail_pi:
@@ -236,7 +313,7 @@ static void sa1100_rtc_release(struct device *dev)
static int sa1100_rtc_ioctl(struct device *dev, unsigned int cmd,
unsigned long arg)
{
- switch(cmd) {
+ switch (cmd) {
case RTC_AIE_OFF:
spin_lock_irq(&sa1100_rtc_lock);
RTSR &= ~RTSR_ALE;
@@ -257,25 +334,6 @@ static int sa1100_rtc_ioctl(struct device *dev, unsigned int cmd,
RTSR |= RTSR_HZE;
spin_unlock_irq(&sa1100_rtc_lock);
return 0;
- case RTC_PIE_OFF:
- spin_lock_irq(&sa1100_rtc_lock);
- OIER &= ~OIER_E1;
- spin_unlock_irq(&sa1100_rtc_lock);
- return 0;
- case RTC_PIE_ON:
- spin_lock_irq(&sa1100_rtc_lock);
- OSMR1 = timer_freq / rtc_freq + OSCR;
- OIER |= OIER_E1;
- rtc_timer1_count = 1;
- spin_unlock_irq(&sa1100_rtc_lock);
- return 0;
- case RTC_IRQP_READ:
- return put_user(rtc_freq, (unsigned long *)arg);
- case RTC_IRQP_SET:
- if (arg < 1 || arg > timer_freq)
- return -EINVAL;
- rtc_freq = arg;
- return 0;
}
return -ENOIOCTLCMD;
}
@@ -327,12 +385,15 @@ 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: %ld\n", rtc_freq);
+ seq_printf(seq, "periodic_freq\t: %d\n", rtc->irq_freq);
+ seq_printf(seq, "RTSR\t\t: 0x%08x\n", (u32)RTSR);
return 0;
}
@@ -347,6 +408,8 @@ static const struct rtc_class_ops sa1100_rtc_ops = {
.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,
};
static int sa1100_rtc_probe(struct platform_device *pdev)
@@ -364,7 +427,8 @@ static int sa1100_rtc_probe(struct platform_device *pdev)
*/
if (RTTR == 0) {
RTTR = RTC_DEF_DIVIDER + (RTC_DEF_TRIM << 16);
- dev_warn(&pdev->dev, "warning: initializing default clock divider/trim value\n");
+ dev_warn(&pdev->dev, "warning: "
+ "initializing default clock divider/trim value\n");
/* The current RTC value probably doesn't make sense either */
RCNR = 0;
}
@@ -372,13 +436,42 @@ static int sa1100_rtc_probe(struct platform_device *pdev)
device_init_wakeup(&pdev->dev, 1);
rtc = rtc_device_register(pdev->name, &pdev->dev, &sa1100_rtc_ops,
- THIS_MODULE);
+ THIS_MODULE);
if (IS_ERR(rtc))
return PTR_ERR(rtc);
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().
+ *
+ * Sometimes bit 1 of the RTSR (RTSR_HZ) will wake up 1, which means an
+ * interrupt pending, even though interrupts were never enabled.
+ * In this case, this bit it must be reset before enabling
+ * interruptions to avoid a nonexistent interrupt to occur.
+ *
+ * In principle, the same problem would apply to bit 0, although it has
+ * never been observed to happen.
+ *
+ * This issue is addressed both here and in sa1100_rtc_interrupt().
+ * If the issue is not addressed here, in the times when the processor
+ * wakes up with the bit set there will be one spurious interrupt.
+ *
+ * The issue is also dealt with in sa1100_rtc_interrupt() to be on the
+ * safe side, once the condition that lead to this strange
+ * initialization is unknown and could in principle happen during
+ * normal processing.
+ *
+ * Notice that clearing bit 1 and 0 is accomplished by writting ONES to
+ * the corresponding bits in RTSR. */
+ RTSR = RTSR_AL | RTSR_HZ;
+
return 0;
}
@@ -386,7 +479,7 @@ static int sa1100_rtc_remove(struct platform_device *pdev)
{
struct rtc_device *rtc = platform_get_drvdata(pdev);
- if (rtc)
+ if (rtc)
rtc_device_unregister(rtc);
return 0;
generated by cgit v1.1 at 2024-05-25 10:21:57 +0000