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Commit 2a471bf4 authored by Stephen Rothwell's avatar Stephen Rothwell
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Merge remote-tracking branch 'rtc/rtc-next'

parents 5a6f49b2 36d91a4d
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with 124 additions and 31 deletions
drivers/rtc/rtc-cmos.c
+ 124
− 31
View file @ 2a471bf4
......@@ -43,11 +43,24 @@
#include <linux/of_platform.h>
#ifdef CONFIG_X86
#include <asm/i8259.h>
#include <asm/processor.h>
#include <linux/dmi.h>
#endif
/* this is for "generic access to PC-style RTC" using CMOS_READ/CMOS_WRITE */
#include <linux/mc146818rtc.h>
/*
* Use ACPI SCI to replace HPET interrupt for RTC Alarm event
*
* If cleared, ACPI SCI is only used to wake up the system from suspend
*
* If set, ACPI SCI is used to handle UIE/AIE and system wakeup
*/
static bool use_acpi_alarm;
module_param(use_acpi_alarm, bool, 0444);
struct cmos_rtc {
struct rtc_device *rtc;
struct device *dev;
......@@ -153,6 +166,12 @@ static inline int hpet_unregister_irq_handler(irq_handler_t handler)
#endif
/* Don't use HPET for RTC Alarm event if ACPI Fixed event is used */
static int use_hpet_alarm(void)
{
return is_hpet_enabled() && !use_acpi_alarm;
}
/*----------------------------------------------------------------*/
#ifdef RTC_PORT
......@@ -298,7 +317,7 @@ static void cmos_checkintr(struct cmos_rtc *cmos, unsigned char rtc_control)
*/
rtc_intr = CMOS_READ(RTC_INTR_FLAGS);
if (is_hpet_enabled())
if (use_hpet_alarm())
return;
rtc_intr &= (rtc_control & RTC_IRQMASK) | RTC_IRQF;
......@@ -318,7 +337,13 @@ static void cmos_irq_enable(struct cmos_rtc *cmos, unsigned char mask)
rtc_control |= mask;
CMOS_WRITE(rtc_control, RTC_CONTROL);
hpet_set_rtc_irq_bit(mask);
if (use_hpet_alarm())
hpet_set_rtc_irq_bit(mask);
if ((mask & RTC_AIE) && use_acpi_alarm) {
if (cmos->wake_on)
cmos->wake_on(cmos->dev);
}
cmos_checkintr(cmos, rtc_control);
}
......@@ -330,7 +355,13 @@ static void cmos_irq_disable(struct cmos_rtc *cmos, unsigned char mask)
rtc_control = CMOS_READ(RTC_CONTROL);
rtc_control &= ~mask;
CMOS_WRITE(rtc_control, RTC_CONTROL);
hpet_mask_rtc_irq_bit(mask);
if (use_hpet_alarm())
hpet_mask_rtc_irq_bit(mask);
if ((mask & RTC_AIE) && use_acpi_alarm) {
if (cmos->wake_off)
cmos->wake_off(cmos->dev);
}
cmos_checkintr(cmos, rtc_control);
}
......@@ -448,10 +479,14 @@ static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t)
CMOS_WRITE(mon, cmos->mon_alrm);
}
/* FIXME the HPET alarm glue currently ignores day_alrm
* and mon_alrm ...
*/
hpet_set_alarm_time(t->time.tm_hour, t->time.tm_min, t->time.tm_sec);
if (use_hpet_alarm()) {
/*
* FIXME the HPET alarm glue currently ignores day_alrm
* and mon_alrm ...
*/
hpet_set_alarm_time(t->time.tm_hour, t->time.tm_min,
t->time.tm_sec);
}
if (t->enabled)
cmos_irq_enable(cmos, RTC_AIE);
......@@ -508,7 +543,7 @@ static int cmos_procfs(struct device *dev, struct seq_file *seq)
"batt_status\t: %s\n",
(rtc_control & RTC_PIE) ? "yes" : "no",
(rtc_control & RTC_UIE) ? "yes" : "no",
is_hpet_enabled() ? "yes" : "no",
use_hpet_alarm() ? "yes" : "no",
// (rtc_control & RTC_SQWE) ? "yes" : "no",
(rtc_control & RTC_DM_BINARY) ? "no" : "yes",
(rtc_control & RTC_DST_EN) ? "yes" : "no",
......@@ -614,7 +649,7 @@ static irqreturn_t cmos_interrupt(int irq, void *p)
*/
irqstat = CMOS_READ(RTC_INTR_FLAGS);
rtc_control = CMOS_READ(RTC_CONTROL);
if (is_hpet_enabled())
if (use_hpet_alarm())
irqstat = (unsigned long)irq & 0xF0;
/* If we were suspended, RTC_CONTROL may not be accurate since the
......@@ -633,7 +668,8 @@ static irqreturn_t cmos_interrupt(int irq, void *p)
cmos_rtc.suspend_ctrl &= ~RTC_AIE;
rtc_control &= ~RTC_AIE;
CMOS_WRITE(rtc_control, RTC_CONTROL);
hpet_mask_rtc_irq_bit(RTC_AIE);
if (use_hpet_alarm())
hpet_mask_rtc_irq_bit(RTC_AIE);
CMOS_READ(RTC_INTR_FLAGS);
}
spin_unlock(&rtc_lock);
......@@ -762,7 +798,8 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
* need to do something about other clock frequencies.
*/
cmos_rtc.rtc->irq_freq = 1024;
hpet_set_periodic_freq(cmos_rtc.rtc->irq_freq);
if (use_hpet_alarm())
hpet_set_periodic_freq(cmos_rtc.rtc->irq_freq);
CMOS_WRITE(RTC_REF_CLCK_32KHZ | 0x06, RTC_FREQ_SELECT);
}
......@@ -780,12 +817,13 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
goto cleanup1;
}
hpet_rtc_timer_init();
if (use_hpet_alarm())
hpet_rtc_timer_init();
if (is_valid_irq(rtc_irq)) {
irq_handler_t rtc_cmos_int_handler;
if (is_hpet_enabled()) {
if (use_hpet_alarm()) {
rtc_cmos_int_handler = hpet_rtc_interrupt;
retval = hpet_register_irq_handler(cmos_interrupt);
if (retval) {
......@@ -824,7 +862,7 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
"alarms up to one day",
cmos_rtc.century ? ", y3k" : "",
nvmem_cfg.size,
is_hpet_enabled() ? ", hpet irqs" : "");
use_hpet_alarm() ? ", hpet irqs" : "");
return 0;
......@@ -858,7 +896,8 @@ static void cmos_do_remove(struct device *dev)
if (is_valid_irq(cmos->irq)) {
free_irq(cmos->irq, cmos->rtc);
hpet_unregister_irq_handler(cmos_interrupt);
if (use_hpet_alarm())
hpet_unregister_irq_handler(cmos_interrupt);
}
cmos->rtc = NULL;
......@@ -935,13 +974,13 @@ static int cmos_suspend(struct device *dev)
mask = RTC_IRQMASK;
tmp &= ~mask;
CMOS_WRITE(tmp, RTC_CONTROL);
hpet_mask_rtc_irq_bit(mask);
if (use_hpet_alarm())
hpet_mask_rtc_irq_bit(mask);
cmos_checkintr(cmos, tmp);
}
spin_unlock_irq(&rtc_lock);
if (tmp & RTC_AIE) {
if ((tmp & RTC_AIE) && !use_acpi_alarm) {
cmos->enabled_wake = 1;
if (cmos->wake_on)
cmos->wake_on(dev);
......@@ -976,8 +1015,26 @@ static void cmos_check_wkalrm(struct device *dev)
{
struct cmos_rtc *cmos = dev_get_drvdata(dev);
struct rtc_wkalrm current_alarm;
time64_t t_now;
time64_t t_current_expires;
time64_t t_saved_expires;
struct rtc_time now;
/* Check if we have RTC Alarm armed */
if (!(cmos->suspend_ctrl & RTC_AIE))
return;
cmos_read_time(dev, &now);
t_now = rtc_tm_to_time64(&now);
/*
* ACPI RTC wake event is cleared after resume from STR,
* ACK the rtc irq here
*/
if (t_now >= cmos->alarm_expires && use_acpi_alarm) {
cmos_interrupt(0, (void *)cmos->rtc);
return;
}
cmos_read_alarm(dev, &current_alarm);
t_current_expires = rtc_tm_to_time64(&current_alarm.time);
......@@ -996,7 +1053,7 @@ static int __maybe_unused cmos_resume(struct device *dev)
struct cmos_rtc *cmos = dev_get_drvdata(dev);
unsigned char tmp;
if (cmos->enabled_wake) {
if (cmos->enabled_wake && !use_acpi_alarm) {
if (cmos->wake_off)
cmos->wake_off(dev);
else
......@@ -1014,16 +1071,17 @@ static int __maybe_unused cmos_resume(struct device *dev)
if (tmp & RTC_IRQMASK) {
unsigned char mask;
if (device_may_wakeup(dev))
if (device_may_wakeup(dev) && use_hpet_alarm())
hpet_rtc_timer_init();
do {
CMOS_WRITE(tmp, RTC_CONTROL);
hpet_set_rtc_irq_bit(tmp & RTC_IRQMASK);
if (use_hpet_alarm())
hpet_set_rtc_irq_bit(tmp & RTC_IRQMASK);
mask = CMOS_READ(RTC_INTR_FLAGS);
mask &= (tmp & RTC_IRQMASK) | RTC_IRQF;
if (!is_hpet_enabled() || !is_intr(mask))
if (!use_hpet_alarm() || !is_intr(mask))
break;
/* force one-shot behavior if HPET blocked
......@@ -1068,16 +1126,27 @@ static u32 rtc_handler(void *context)
unsigned char rtc_intr;
unsigned long flags;
spin_lock_irqsave(&rtc_lock, flags);
if (cmos_rtc.suspend_ctrl)
rtc_control = CMOS_READ(RTC_CONTROL);
if (rtc_control & RTC_AIE) {
cmos_rtc.suspend_ctrl &= ~RTC_AIE;
CMOS_WRITE(rtc_control, RTC_CONTROL);
rtc_intr = CMOS_READ(RTC_INTR_FLAGS);
rtc_update_irq(cmos->rtc, 1, rtc_intr);
/*
* Always update rtc irq when ACPI is used as RTC Alarm.
* Or else, ACPI SCI is enabled during suspend/resume only,
* update rtc irq in that case.
*/
if (use_acpi_alarm)
cmos_interrupt(0, (void *)cmos->rtc);
else {
/* Fix me: can we use cmos_interrupt() here as well? */
spin_lock_irqsave(&rtc_lock, flags);
if (cmos_rtc.suspend_ctrl)
rtc_control = CMOS_READ(RTC_CONTROL);
if (rtc_control & RTC_AIE) {
cmos_rtc.suspend_ctrl &= ~RTC_AIE;
CMOS_WRITE(rtc_control, RTC_CONTROL);
rtc_intr = CMOS_READ(RTC_INTR_FLAGS);
rtc_update_irq(cmos->rtc, 1, rtc_intr);
}
spin_unlock_irqrestore(&rtc_lock, flags);
}
spin_unlock_irqrestore(&rtc_lock, flags);
pm_wakeup_hard_event(dev);
acpi_clear_event(ACPI_EVENT_RTC);
......@@ -1107,6 +1176,28 @@ static void rtc_wake_off(struct device *dev)
acpi_disable_event(ACPI_EVENT_RTC, 0);
}
#ifdef CONFIG_X86
/* Enable use_acpi_alarm mode for Intel platforms no earlier than 2015 */
static void use_acpi_alarm_quirks(void)
{
int year;
if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
return;
if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
return;
if (!is_hpet_enabled())
return;
if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year >= 2015)
use_acpi_alarm = true;
}
#else
static inline void use_acpi_alarm_quirks(void) { }
#endif
/* Every ACPI platform has a mc146818 compatible "cmos rtc". Here we find
* its device node and pass extra config data. This helps its driver use
* capabilities that the now-obsolete mc146818 didn't have, and informs it
......@@ -1119,6 +1210,8 @@ static void cmos_wake_setup(struct device *dev)
if (acpi_disabled)
return;
use_acpi_alarm_quirks();
rtc_wake_setup(dev);
acpi_rtc_info.wake_on = rtc_wake_on;
acpi_rtc_info.wake_off = rtc_wake_off;
......
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