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-rw-r--r--drivers/rtc/rtc-cmos.c1137
1 files changed, 760 insertions, 377 deletions
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index be06d7150de5..0743c6acd6e2 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -1,13 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* RTC class driver for "CMOS RTC": PCs, ACPI, etc
*
* Copyright (C) 1996 Paul Gortmaker (drivers/char/rtc.c)
* Copyright (C) 2006 David Brownell (convert to new framework)
- *
- * 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; either version
- * 2 of the License, or (at your option) any later version.
*/
/*
@@ -28,26 +24,58 @@
* interrupts disabled, holding the global rtc_lock, to exclude those
* other drivers and utilities on correctly configured systems.
*/
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
-#include <linux/mod_devicetable.h>
#include <linux/log2.h>
#include <linux/pm.h>
#include <linux/of.h>
#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 <asm-generic/rtc.h>
+#include <linux/mc146818rtc.h>
+
+#ifdef CONFIG_ACPI
+/*
+ * 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);
+
+static inline int cmos_use_acpi_alarm(void)
+{
+ return use_acpi_alarm;
+}
+#else /* !CONFIG_ACPI */
+
+static inline int cmos_use_acpi_alarm(void)
+{
+ return 0;
+}
+#endif
struct cmos_rtc {
struct rtc_device *rtc;
struct device *dev;
int irq;
struct resource *iomem;
+ time64_t alarm_expires;
void (*wake_on)(struct device *);
void (*wake_off)(struct device *);
@@ -59,6 +87,8 @@ struct cmos_rtc {
u8 day_alrm;
u8 mon_alrm;
u8 century;
+
+ struct rtc_wkalrm saved_wkalrm;
};
/* both platform and pnp busses use negative numbers for invalid irqs */
@@ -121,11 +151,6 @@ static inline int hpet_set_periodic_freq(unsigned long freq)
return 0;
}
-static inline int hpet_rtc_dropped_irq(void)
-{
- return 0;
-}
-
static inline int hpet_rtc_timer_init(void)
{
return 0;
@@ -145,6 +170,12 @@ 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 inline int use_hpet_alarm(void)
+{
+ return is_hpet_enabled() && !cmos_use_acpi_alarm();
+}
+
/*----------------------------------------------------------------*/
#ifdef RTC_PORT
@@ -186,62 +217,95 @@ static inline void cmos_write_bank2(unsigned char val, unsigned char addr)
static int cmos_read_time(struct device *dev, struct rtc_time *t)
{
- /* REVISIT: if the clock has a "century" register, use
- * that instead of the heuristic in get_rtc_time().
- * That'll make Y3K compatility (year > 2070) easy!
+ int ret;
+
+ /*
+ * If pm_trace abused the RTC for storage, set the timespec to 0,
+ * which tells the caller that this RTC value is unusable.
*/
- get_rtc_time(t);
+ if (!pm_trace_rtc_valid())
+ return -EIO;
+
+ ret = mc146818_get_time(t, 1000);
+ if (ret < 0) {
+ dev_err_ratelimited(dev, "unable to read current time\n");
+ return ret;
+ }
+
return 0;
}
static int cmos_set_time(struct device *dev, struct rtc_time *t)
{
- /* REVISIT: set the "century" register if available
- *
- * NOTE: this ignores the issue whereby updating the seconds
+ /* NOTE: this ignores the issue whereby updating the seconds
* takes effect exactly 500ms after we write the register.
* (Also queueing and other delays before we get this far.)
*/
- return set_rtc_time(t);
+ return mc146818_set_time(t);
+}
+
+struct cmos_read_alarm_callback_param {
+ struct cmos_rtc *cmos;
+ struct rtc_time *time;
+ unsigned char rtc_control;
+};
+
+static void cmos_read_alarm_callback(unsigned char __always_unused seconds,
+ void *param_in)
+{
+ struct cmos_read_alarm_callback_param *p =
+ (struct cmos_read_alarm_callback_param *)param_in;
+ struct rtc_time *time = p->time;
+
+ time->tm_sec = CMOS_READ(RTC_SECONDS_ALARM);
+ time->tm_min = CMOS_READ(RTC_MINUTES_ALARM);
+ time->tm_hour = CMOS_READ(RTC_HOURS_ALARM);
+
+ if (p->cmos->day_alrm) {
+ /* ignore upper bits on readback per ACPI spec */
+ time->tm_mday = CMOS_READ(p->cmos->day_alrm) & 0x3f;
+ if (!time->tm_mday)
+ time->tm_mday = -1;
+
+ if (p->cmos->mon_alrm) {
+ time->tm_mon = CMOS_READ(p->cmos->mon_alrm);
+ if (!time->tm_mon)
+ time->tm_mon = -1;
+ }
+ }
+
+ p->rtc_control = CMOS_READ(RTC_CONTROL);
}
static int cmos_read_alarm(struct device *dev, struct rtc_wkalrm *t)
{
struct cmos_rtc *cmos = dev_get_drvdata(dev);
- unsigned char rtc_control;
+ struct cmos_read_alarm_callback_param p = {
+ .cmos = cmos,
+ .time = &t->time,
+ };
+ /* This not only a rtc_op, but also called directly */
if (!is_valid_irq(cmos->irq))
- return -EIO;
+ return -ETIMEDOUT;
/* 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;
-
- spin_lock_irq(&rtc_lock);
- t->time.tm_sec = CMOS_READ(RTC_SECONDS_ALARM);
- t->time.tm_min = CMOS_READ(RTC_MINUTES_ALARM);
- t->time.tm_hour = CMOS_READ(RTC_HOURS_ALARM);
-
- if (cmos->day_alrm) {
- /* ignore upper bits on readback per ACPI spec */
- t->time.tm_mday = CMOS_READ(cmos->day_alrm) & 0x3f;
- if (!t->time.tm_mday)
- t->time.tm_mday = -1;
-
- if (cmos->mon_alrm) {
- t->time.tm_mon = CMOS_READ(cmos->mon_alrm);
- if (!t->time.tm_mon)
- t->time.tm_mon = -1;
- }
- }
- rtc_control = CMOS_READ(RTC_CONTROL);
- spin_unlock_irq(&rtc_lock);
+ /* Some Intel chipsets disconnect the alarm registers when the clock
+ * update is in progress - during this time reads return bogus values
+ * and writes may fail silently. See for example "7th Generation Intel®
+ * Processor Family I/O for U/Y Platforms [...] Datasheet", section
+ * 27.7.1
+ *
+ * Use the mc146818_avoid_UIP() function to avoid this.
+ */
+ if (!mc146818_avoid_UIP(cmos_read_alarm_callback, 10, &p))
+ return -EIO;
- if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
+ if (!(p.rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
if (((unsigned)t->time.tm_sec) < 0x60)
t->time.tm_sec = bcd2bin(t->time.tm_sec);
else
@@ -269,9 +333,8 @@ static int cmos_read_alarm(struct device *dev, struct rtc_wkalrm *t)
}
}
}
- t->time.tm_year = -1;
- t->enabled = !!(rtc_control & RTC_AIE);
+ t->enabled = !!(p.rtc_control & RTC_AIE);
t->pending = 0;
return 0;
@@ -286,7 +349,7 @@ 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;
@@ -306,7 +369,13 @@ 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) && cmos_use_acpi_alarm()) {
+ if (cmos->wake_on)
+ cmos->wake_on(cmos->dev);
+ }
cmos_checkintr(cmos, rtc_control);
}
@@ -318,62 +387,175 @@ 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) && cmos_use_acpi_alarm()) {
+ if (cmos->wake_off)
+ cmos->wake_off(cmos->dev);
+ }
cmos_checkintr(cmos, rtc_control);
}
-static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t)
+static int cmos_validate_alarm(struct device *dev, struct rtc_wkalrm *t)
{
- struct cmos_rtc *cmos = dev_get_drvdata(dev);
- unsigned char mon, mday, hrs, min, sec, rtc_control;
-
- if (!is_valid_irq(cmos->irq))
- return -EIO;
+ struct cmos_rtc *cmos = dev_get_drvdata(dev);
+ struct rtc_time now;
+
+ cmos_read_time(dev, &now);
+
+ if (!cmos->day_alrm) {
+ time64_t t_max_date;
+ time64_t t_alrm;
+
+ t_max_date = rtc_tm_to_time64(&now);
+ t_max_date += 24 * 60 * 60 - 1;
+ t_alrm = rtc_tm_to_time64(&t->time);
+ if (t_alrm > t_max_date) {
+ dev_err(dev,
+ "Alarms can be up to one day in the future\n");
+ return -EINVAL;
+ }
+ } else if (!cmos->mon_alrm) {
+ struct rtc_time max_date = now;
+ time64_t t_max_date;
+ time64_t t_alrm;
+ int max_mday;
+
+ if (max_date.tm_mon == 11) {
+ max_date.tm_mon = 0;
+ max_date.tm_year += 1;
+ } else {
+ max_date.tm_mon += 1;
+ }
+ max_mday = rtc_month_days(max_date.tm_mon, max_date.tm_year);
+ if (max_date.tm_mday > max_mday)
+ max_date.tm_mday = max_mday;
+
+ t_max_date = rtc_tm_to_time64(&max_date);
+ t_max_date -= 1;
+ t_alrm = rtc_tm_to_time64(&t->time);
+ if (t_alrm > t_max_date) {
+ dev_err(dev,
+ "Alarms can be up to one month in the future\n");
+ return -EINVAL;
+ }
+ } else {
+ struct rtc_time max_date = now;
+ time64_t t_max_date;
+ time64_t t_alrm;
+ int max_mday;
+
+ max_date.tm_year += 1;
+ max_mday = rtc_month_days(max_date.tm_mon, max_date.tm_year);
+ if (max_date.tm_mday > max_mday)
+ max_date.tm_mday = max_mday;
+
+ t_max_date = rtc_tm_to_time64(&max_date);
+ t_max_date -= 1;
+ t_alrm = rtc_tm_to_time64(&t->time);
+ if (t_alrm > t_max_date) {
+ dev_err(dev,
+ "Alarms can be up to one year in the future\n");
+ return -EINVAL;
+ }
+ }
- mon = t->time.tm_mon + 1;
- mday = t->time.tm_mday;
- hrs = t->time.tm_hour;
- min = t->time.tm_min;
- sec = t->time.tm_sec;
+ return 0;
+}
- rtc_control = CMOS_READ(RTC_CONTROL);
- if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
- /* Writing 0xff means "don't care" or "match all". */
- mon = (mon <= 12) ? bin2bcd(mon) : 0xff;
- mday = (mday >= 1 && mday <= 31) ? bin2bcd(mday) : 0xff;
- hrs = (hrs < 24) ? bin2bcd(hrs) : 0xff;
- min = (min < 60) ? bin2bcd(min) : 0xff;
- sec = (sec < 60) ? bin2bcd(sec) : 0xff;
- }
+struct cmos_set_alarm_callback_param {
+ struct cmos_rtc *cmos;
+ unsigned char mon, mday, hrs, min, sec;
+ struct rtc_wkalrm *t;
+};
- spin_lock_irq(&rtc_lock);
+/* Note: this function may be executed by mc146818_avoid_UIP() more then
+ * once
+ */
+static void cmos_set_alarm_callback(unsigned char __always_unused seconds,
+ void *param_in)
+{
+ struct cmos_set_alarm_callback_param *p =
+ (struct cmos_set_alarm_callback_param *)param_in;
/* next rtc irq must not be from previous alarm setting */
- cmos_irq_disable(cmos, RTC_AIE);
+ cmos_irq_disable(p->cmos, RTC_AIE);
/* update alarm */
- CMOS_WRITE(hrs, RTC_HOURS_ALARM);
- CMOS_WRITE(min, RTC_MINUTES_ALARM);
- CMOS_WRITE(sec, RTC_SECONDS_ALARM);
+ CMOS_WRITE(p->hrs, RTC_HOURS_ALARM);
+ CMOS_WRITE(p->min, RTC_MINUTES_ALARM);
+ CMOS_WRITE(p->sec, RTC_SECONDS_ALARM);
/* the system may support an "enhanced" alarm */
- if (cmos->day_alrm) {
- CMOS_WRITE(mday, cmos->day_alrm);
- if (cmos->mon_alrm)
- CMOS_WRITE(mon, cmos->mon_alrm);
+ if (p->cmos->day_alrm) {
+ CMOS_WRITE(p->mday, p->cmos->day_alrm);
+ if (p->cmos->mon_alrm)
+ CMOS_WRITE(p->mon, p->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(p->t->time.tm_hour, p->t->time.tm_min,
+ p->t->time.tm_sec);
+ }
- if (t->enabled)
- cmos_irq_enable(cmos, RTC_AIE);
+ if (p->t->enabled)
+ cmos_irq_enable(p->cmos, RTC_AIE);
+}
+static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+ struct cmos_rtc *cmos = dev_get_drvdata(dev);
+ struct cmos_set_alarm_callback_param p = {
+ .cmos = cmos,
+ .t = t
+ };
+ unsigned char rtc_control;
+ int ret;
+
+ /* This not only a rtc_op, but also called directly */
+ if (!is_valid_irq(cmos->irq))
+ return -EIO;
+
+ ret = cmos_validate_alarm(dev, t);
+ if (ret < 0)
+ return ret;
+
+ p.mon = t->time.tm_mon + 1;
+ p.mday = t->time.tm_mday;
+ p.hrs = t->time.tm_hour;
+ p.min = t->time.tm_min;
+ p.sec = t->time.tm_sec;
+
+ spin_lock_irq(&rtc_lock);
+ rtc_control = CMOS_READ(RTC_CONTROL);
spin_unlock_irq(&rtc_lock);
+ if (!(rtc_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) {
+ /* Writing 0xff means "don't care" or "match all". */
+ p.mon = (p.mon <= 12) ? bin2bcd(p.mon) : 0xff;
+ p.mday = (p.mday >= 1 && p.mday <= 31) ? bin2bcd(p.mday) : 0xff;
+ p.hrs = (p.hrs < 24) ? bin2bcd(p.hrs) : 0xff;
+ p.min = (p.min < 60) ? bin2bcd(p.min) : 0xff;
+ p.sec = (p.sec < 60) ? bin2bcd(p.sec) : 0xff;
+ }
+
+ /*
+ * Some Intel chipsets disconnect the alarm registers when the clock
+ * update is in progress - during this time writes fail silently.
+ *
+ * Use mc146818_avoid_UIP() to avoid this.
+ */
+ if (!mc146818_avoid_UIP(cmos_set_alarm_callback, 10, &p))
+ return -ETIMEDOUT;
+
+ cmos->alarm_expires = rtc_tm_to_time64(&t->time);
+
return 0;
}
@@ -382,9 +564,6 @@ static int cmos_alarm_irq_enable(struct device *dev, unsigned int enabled)
struct cmos_rtc *cmos = dev_get_drvdata(dev);
unsigned long flags;
- if (!is_valid_irq(cmos->irq))
- return -EINVAL;
-
spin_lock_irqsave(&rtc_lock, flags);
if (enabled)
@@ -396,7 +575,7 @@ static int cmos_alarm_irq_enable(struct device *dev, unsigned int enabled)
return 0;
}
-#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
+#if IS_ENABLED(CONFIG_RTC_INTF_PROC)
static int cmos_procfs(struct device *dev, struct seq_file *seq)
{
@@ -411,23 +590,25 @@ static int cmos_procfs(struct device *dev, struct seq_file *seq)
/* NOTE: at least ICH6 reports battery status using a different
* (non-RTC) bit; and SQWE is ignored on many current systems.
*/
- return seq_printf(seq,
- "periodic_IRQ\t: %s\n"
- "update_IRQ\t: %s\n"
- "HPET_emulated\t: %s\n"
- // "square_wave\t: %s\n"
- "BCD\t\t: %s\n"
- "DST_enable\t: %s\n"
- "periodic_freq\t: %d\n"
- "batt_status\t: %s\n",
- (rtc_control & RTC_PIE) ? "yes" : "no",
- (rtc_control & RTC_UIE) ? "yes" : "no",
- is_hpet_enabled() ? "yes" : "no",
- // (rtc_control & RTC_SQWE) ? "yes" : "no",
- (rtc_control & RTC_DM_BINARY) ? "no" : "yes",
- (rtc_control & RTC_DST_EN) ? "yes" : "no",
- cmos->rtc->irq_freq,
- (valid & RTC_VRT) ? "okay" : "dead");
+ seq_printf(seq,
+ "periodic_IRQ\t: %s\n"
+ "update_IRQ\t: %s\n"
+ "HPET_emulated\t: %s\n"
+ // "square_wave\t: %s\n"
+ "BCD\t\t: %s\n"
+ "DST_enable\t: %s\n"
+ "periodic_freq\t: %d\n"
+ "batt_status\t: %s\n",
+ (rtc_control & RTC_PIE) ? "yes" : "no",
+ (rtc_control & RTC_UIE) ? "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",
+ cmos->rtc->irq_freq,
+ (valid & RTC_VRT) ? "okay" : "dead");
+
+ return 0;
}
#else
@@ -453,50 +634,30 @@ static const struct rtc_class_ops cmos_rtc_ops = {
#define NVRAM_OFFSET (RTC_REG_D + 1)
-static ssize_t
-cmos_nvram_read(struct file *filp, struct kobject *kobj,
- struct bin_attribute *attr,
- char *buf, loff_t off, size_t count)
+static int cmos_nvram_read(void *priv, unsigned int off, void *val,
+ size_t count)
{
- int retval;
-
- if (unlikely(off >= attr->size))
- return 0;
- if (unlikely(off < 0))
- return -EINVAL;
- if ((off + count) > attr->size)
- count = attr->size - off;
+ unsigned char *buf = val;
off += NVRAM_OFFSET;
- spin_lock_irq(&rtc_lock);
- for (retval = 0; count; count--, off++, retval++) {
+ for (; count; count--, off++, buf++) {
+ guard(spinlock_irq)(&rtc_lock);
if (off < 128)
- *buf++ = CMOS_READ(off);
+ *buf = CMOS_READ(off);
else if (can_bank2)
- *buf++ = cmos_read_bank2(off);
+ *buf = cmos_read_bank2(off);
else
- break;
+ return -EIO;
}
- spin_unlock_irq(&rtc_lock);
- return retval;
+ return 0;
}
-static ssize_t
-cmos_nvram_write(struct file *filp, struct kobject *kobj,
- struct bin_attribute *attr,
- char *buf, loff_t off, size_t count)
+static int cmos_nvram_write(void *priv, unsigned int off, void *val,
+ size_t count)
{
- struct cmos_rtc *cmos;
- int retval;
-
- cmos = dev_get_drvdata(container_of(kobj, struct device, kobj));
- if (unlikely(off >= attr->size))
- return -EFBIG;
- if (unlikely(off < 0))
- return -EINVAL;
- if ((off + count) > attr->size)
- count = attr->size - off;
+ struct cmos_rtc *cmos = priv;
+ unsigned char *buf = val;
/* NOTE: on at least PCs and Ataris, the boot firmware uses a
* checksum on part of the NVRAM data. That's currently ignored
@@ -504,36 +665,25 @@ cmos_nvram_write(struct file *filp, struct kobject *kobj,
* NVRAM to update, updating checksums is also part of its job.
*/
off += NVRAM_OFFSET;
- spin_lock_irq(&rtc_lock);
- for (retval = 0; count; count--, off++, retval++) {
+ for (; count; count--, off++, buf++) {
/* don't trash RTC registers */
if (off == cmos->day_alrm
|| off == cmos->mon_alrm
|| off == cmos->century)
- buf++;
- else if (off < 128)
- CMOS_WRITE(*buf++, off);
+ continue;
+
+ guard(spinlock_irq)(&rtc_lock);
+ if (off < 128)
+ CMOS_WRITE(*buf, off);
else if (can_bank2)
- cmos_write_bank2(*buf++, off);
+ cmos_write_bank2(*buf, off);
else
- break;
+ return -EIO;
}
- spin_unlock_irq(&rtc_lock);
- return retval;
+ return 0;
}
-static struct bin_attribute nvram = {
- .attr = {
- .name = "nvram",
- .mode = S_IRUGO | S_IWUSR,
- },
-
- .read = cmos_nvram_read,
- .write = cmos_nvram_write,
- /* size gets set up later */
-};
-
/*----------------------------------------------------------------*/
static struct cmos_rtc cmos_rtc;
@@ -542,8 +692,12 @@ static irqreturn_t cmos_interrupt(int irq, void *p)
{
u8 irqstat;
u8 rtc_control;
+ unsigned long flags;
- spin_lock(&rtc_lock);
+ /* We cannot use spin_lock() here, as cmos_interrupt() is also called
+ * in a non-irq context.
+ */
+ spin_lock_irqsave(&rtc_lock, flags);
/* When the HPET interrupt handler calls us, the interrupt
* status is passed as arg1 instead of the irq number. But
@@ -554,7 +708,7 @@ 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
@@ -573,10 +727,11 @@ 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);
+ spin_unlock_irqrestore(&rtc_lock, flags);
if (is_intr(irqstat)) {
rtc_update_irq(p, 1, irqstat);
@@ -585,6 +740,174 @@ static irqreturn_t cmos_interrupt(int irq, void *p)
return IRQ_NONE;
}
+#ifdef CONFIG_ACPI
+
+#include <linux/acpi.h>
+
+static u32 rtc_handler(void *context)
+{
+ struct device *dev = context;
+ struct cmos_rtc *cmos = dev_get_drvdata(dev);
+ unsigned char rtc_control = 0;
+ unsigned char rtc_intr;
+ unsigned long flags;
+
+
+ /*
+ * 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 (cmos_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);
+ }
+
+ pm_wakeup_hard_event(dev);
+ acpi_clear_event(ACPI_EVENT_RTC);
+ acpi_disable_event(ACPI_EVENT_RTC, 0);
+ return ACPI_INTERRUPT_HANDLED;
+}
+
+static void acpi_rtc_event_setup(struct device *dev)
+{
+ if (acpi_disabled)
+ return;
+
+ acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, dev);
+ /*
+ * After the RTC handler is installed, the Fixed_RTC event should
+ * be disabled. Only when the RTC alarm is set will it be enabled.
+ */
+ acpi_clear_event(ACPI_EVENT_RTC);
+ acpi_disable_event(ACPI_EVENT_RTC, 0);
+}
+
+static void acpi_rtc_event_cleanup(void)
+{
+ if (acpi_disabled)
+ return;
+
+ acpi_remove_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler);
+}
+
+static void rtc_wake_on(struct device *dev)
+{
+ acpi_clear_event(ACPI_EVENT_RTC);
+ acpi_enable_event(ACPI_EVENT_RTC, 0);
+}
+
+static void rtc_wake_off(struct device *dev)
+{
+ acpi_disable_event(ACPI_EVENT_RTC, 0);
+}
+
+#ifdef CONFIG_X86
+static void use_acpi_alarm_quirks(void)
+{
+ switch (boot_cpu_data.x86_vendor) {
+ case X86_VENDOR_INTEL:
+ if (dmi_get_bios_year() < 2015)
+ return;
+ break;
+ case X86_VENDOR_AMD:
+ case X86_VENDOR_HYGON:
+ if (dmi_get_bios_year() < 2021)
+ return;
+ break;
+ default:
+ return;
+ }
+ if (!is_hpet_enabled())
+ return;
+
+ use_acpi_alarm = true;
+}
+#else
+static inline void use_acpi_alarm_quirks(void) { }
+#endif
+
+static void acpi_cmos_wake_setup(struct device *dev)
+{
+ if (acpi_disabled)
+ return;
+
+ use_acpi_alarm_quirks();
+
+ cmos_rtc.wake_on = rtc_wake_on;
+ cmos_rtc.wake_off = rtc_wake_off;
+
+ /* ACPI tables bug workaround. */
+ if (acpi_gbl_FADT.month_alarm && !acpi_gbl_FADT.day_alarm) {
+ dev_dbg(dev, "bogus FADT month_alarm (%d)\n",
+ acpi_gbl_FADT.month_alarm);
+ acpi_gbl_FADT.month_alarm = 0;
+ }
+
+ cmos_rtc.day_alrm = acpi_gbl_FADT.day_alarm;
+ cmos_rtc.mon_alrm = acpi_gbl_FADT.month_alarm;
+ cmos_rtc.century = acpi_gbl_FADT.century;
+
+ if (acpi_gbl_FADT.flags & ACPI_FADT_S4_RTC_WAKE)
+ dev_info(dev, "RTC can wake from S4\n");
+
+ /* RTC always wakes from S1/S2/S3, and often S4/STD */
+ device_init_wakeup(dev, true);
+}
+
+static void cmos_check_acpi_rtc_status(struct device *dev,
+ unsigned char *rtc_control)
+{
+ struct cmos_rtc *cmos = dev_get_drvdata(dev);
+ acpi_event_status rtc_status;
+ acpi_status status;
+
+ if (acpi_gbl_FADT.flags & ACPI_FADT_FIXED_RTC)
+ return;
+
+ status = acpi_get_event_status(ACPI_EVENT_RTC, &rtc_status);
+ if (ACPI_FAILURE(status)) {
+ dev_err(dev, "Could not get RTC status\n");
+ } else if (rtc_status & ACPI_EVENT_FLAG_SET) {
+ unsigned char mask;
+ *rtc_control &= ~RTC_AIE;
+ CMOS_WRITE(*rtc_control, RTC_CONTROL);
+ mask = CMOS_READ(RTC_INTR_FLAGS);
+ rtc_update_irq(cmos->rtc, 1, mask);
+ }
+}
+
+#else /* !CONFIG_ACPI */
+
+static inline void acpi_rtc_event_setup(struct device *dev)
+{
+}
+
+static inline void acpi_rtc_event_cleanup(void)
+{
+}
+
+static inline void acpi_cmos_wake_setup(struct device *dev)
+{
+}
+
+static inline void cmos_check_acpi_rtc_status(struct device *dev,
+ unsigned char *rtc_control)
+{
+}
+#endif /* CONFIG_ACPI */
+
#ifdef CONFIG_PNP
#define INITSECTION
@@ -592,13 +915,26 @@ static irqreturn_t cmos_interrupt(int irq, void *p)
#define INITSECTION __init
#endif
+#define SECS_PER_DAY (24 * 60 * 60)
+#define SECS_PER_MONTH (28 * SECS_PER_DAY)
+#define SECS_PER_YEAR (365 * SECS_PER_DAY)
+
static int INITSECTION
cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
{
- struct cmos_rtc_board_info *info = dev->platform_data;
+ struct cmos_rtc_board_info *info = dev_get_platdata(dev);
int retval = 0;
unsigned char rtc_control;
unsigned address_space;
+ u32 flags = 0;
+ struct nvmem_config nvmem_cfg = {
+ .name = "cmos_nvram",
+ .word_size = 1,
+ .stride = 1,
+ .reg_read = cmos_nvram_read,
+ .reg_write = cmos_nvram_write,
+ .priv = &cmos_rtc,
+ };
/* there can be only one ... */
if (cmos_rtc.dev)
@@ -612,9 +948,12 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
* REVISIT non-x86 systems may instead use memory space resources
* (needing ioremap etc), not i/o space resources like this ...
*/
- ports = request_region(ports->start,
- resource_size(ports),
- driver_name);
+ if (RTC_IOMAPPED)
+ ports = request_region(ports->start, resource_size(ports),
+ driver_name);
+ else
+ ports = request_mem_region(ports->start, resource_size(ports),
+ driver_name);
if (!ports) {
dev_dbg(dev, "i/o registers already in use\n");
return -EBUSY;
@@ -651,68 +990,96 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
* expect CMOS_READ and friends to handle.
*/
if (info) {
- if (info->rtc_day_alarm && info->rtc_day_alarm < 128)
- cmos_rtc.day_alrm = info->rtc_day_alarm;
- if (info->rtc_mon_alarm && info->rtc_mon_alarm < 128)
- cmos_rtc.mon_alrm = info->rtc_mon_alarm;
- if (info->rtc_century && info->rtc_century < 128)
- cmos_rtc.century = info->rtc_century;
+ if (info->flags)
+ flags = info->flags;
+ if (info->address_space)
+ address_space = info->address_space;
+
+ cmos_rtc.day_alrm = info->rtc_day_alarm;
+ cmos_rtc.mon_alrm = info->rtc_mon_alarm;
+ cmos_rtc.century = info->rtc_century;
if (info->wake_on && info->wake_off) {
cmos_rtc.wake_on = info->wake_on;
cmos_rtc.wake_off = info->wake_off;
}
+ } else {
+ acpi_cmos_wake_setup(dev);
}
+ if (cmos_rtc.day_alrm >= 128)
+ cmos_rtc.day_alrm = 0;
+
+ if (cmos_rtc.mon_alrm >= 128)
+ cmos_rtc.mon_alrm = 0;
+
+ if (cmos_rtc.century >= 128)
+ cmos_rtc.century = 0;
+
cmos_rtc.dev = dev;
dev_set_drvdata(dev, &cmos_rtc);
- cmos_rtc.rtc = rtc_device_register(driver_name, dev,
- &cmos_rtc_ops, THIS_MODULE);
+ cmos_rtc.rtc = devm_rtc_allocate_device(dev);
if (IS_ERR(cmos_rtc.rtc)) {
retval = PTR_ERR(cmos_rtc.rtc);
goto cleanup0;
}
+ if (cmos_rtc.mon_alrm)
+ cmos_rtc.rtc->alarm_offset_max = SECS_PER_YEAR - 1;
+ else if (cmos_rtc.day_alrm)
+ cmos_rtc.rtc->alarm_offset_max = SECS_PER_MONTH - 1;
+ else
+ cmos_rtc.rtc->alarm_offset_max = SECS_PER_DAY - 1;
+
rename_region(ports, dev_name(&cmos_rtc.rtc->dev));
+ if (!mc146818_does_rtc_work()) {
+ dev_warn(dev, "broken or not accessible\n");
+ retval = -ENXIO;
+ goto cleanup1;
+ }
+
spin_lock_irq(&rtc_lock);
- /* force periodic irq to CMOS reset default of 1024Hz;
- *
- * REVISIT it's been reported that at least one x86_64 ALI mobo
- * doesn't use 32KHz here ... for portability we might need to
- * do something about other clock frequencies.
- */
- cmos_rtc.rtc->irq_freq = 1024;
- hpet_set_periodic_freq(cmos_rtc.rtc->irq_freq);
- CMOS_WRITE(RTC_REF_CLCK_32KHZ | 0x06, RTC_FREQ_SELECT);
+ if (!(flags & CMOS_RTC_FLAGS_NOFREQ)) {
+ /* force periodic irq to CMOS reset default of 1024Hz;
+ *
+ * REVISIT it's been reported that at least one x86_64 ALI
+ * mobo doesn't use 32KHz here ... for portability we might
+ * need to do something about other clock frequencies.
+ */
+ cmos_rtc.rtc->irq_freq = 1024;
+ if (use_hpet_alarm())
+ hpet_set_periodic_freq(cmos_rtc.rtc->irq_freq);
+ CMOS_WRITE(RTC_REF_CLCK_32KHZ | 0x06, RTC_FREQ_SELECT);
+ }
/* disable irqs */
- cmos_irq_disable(&cmos_rtc, RTC_PIE | RTC_AIE | RTC_UIE);
+ if (is_valid_irq(rtc_irq))
+ cmos_irq_disable(&cmos_rtc, RTC_PIE | RTC_AIE | RTC_UIE);
rtc_control = CMOS_READ(RTC_CONTROL);
spin_unlock_irq(&rtc_lock);
- /* FIXME:
- * <asm-generic/rtc.h> doesn't know 12-hour mode either.
- */
if (is_valid_irq(rtc_irq) && !(rtc_control & RTC_24H)) {
dev_warn(dev, "only 24-hr supported\n");
retval = -ENXIO;
goto cleanup1;
}
+ 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()) {
- int err;
-
+ if (use_hpet_alarm()) {
rtc_cmos_int_handler = hpet_rtc_interrupt;
- err = hpet_register_irq_handler(cmos_interrupt);
- if (err != 0) {
+ retval = hpet_register_irq_handler(cmos_interrupt);
+ if (retval) {
+ hpet_mask_rtc_irq_bit(RTC_IRQMASK);
dev_warn(dev, "hpet_register_irq_handler "
" failed in rtc_init().");
goto cleanup1;
@@ -727,25 +1094,38 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
dev_dbg(dev, "IRQ %d is already in use\n", rtc_irq);
goto cleanup1;
}
+ } else {
+ clear_bit(RTC_FEATURE_ALARM, cmos_rtc.rtc->features);
}
- hpet_rtc_timer_init();
- /* export at least the first block of NVRAM */
- nvram.size = address_space - NVRAM_OFFSET;
- retval = sysfs_create_bin_file(&dev->kobj, &nvram);
- if (retval < 0) {
- dev_dbg(dev, "can't create nvram file? %d\n", retval);
+ cmos_rtc.rtc->ops = &cmos_rtc_ops;
+
+ retval = devm_rtc_register_device(cmos_rtc.rtc);
+ if (retval)
goto cleanup2;
- }
- dev_info(dev, "%s%s, %zd bytes nvram%s\n",
- !is_valid_irq(rtc_irq) ? "no alarms" :
- cmos_rtc.mon_alrm ? "alarms up to one year" :
- cmos_rtc.day_alrm ? "alarms up to one month" :
- "alarms up to one day",
- cmos_rtc.century ? ", y3k" : "",
- nvram.size,
- is_hpet_enabled() ? ", hpet irqs" : "");
+ /* Set the sync offset for the periodic 11min update correct */
+ cmos_rtc.rtc->set_offset_nsec = NSEC_PER_SEC / 2;
+
+ /* export at least the first block of NVRAM */
+ nvmem_cfg.size = address_space - NVRAM_OFFSET;
+ devm_rtc_nvmem_register(cmos_rtc.rtc, &nvmem_cfg);
+
+ /*
+ * Everything has gone well so far, so by default register a handler for
+ * the ACPI RTC fixed event.
+ */
+ if (!info)
+ acpi_rtc_event_setup(dev);
+
+ dev_info(dev, "%s%s, %d bytes nvram%s\n",
+ !is_valid_irq(rtc_irq) ? "no alarms" :
+ cmos_rtc.mon_alrm ? "alarms up to one year" :
+ cmos_rtc.day_alrm ? "alarms up to one month" :
+ "alarms up to one day",
+ cmos_rtc.century ? ", y3k" : "",
+ nvmem_cfg.size,
+ use_hpet_alarm() ? ", hpet irqs" : "");
return 0;
@@ -754,45 +1134,94 @@ cleanup2:
free_irq(rtc_irq, cmos_rtc.rtc);
cleanup1:
cmos_rtc.dev = NULL;
- rtc_device_unregister(cmos_rtc.rtc);
cleanup0:
- release_region(ports->start, resource_size(ports));
+ if (RTC_IOMAPPED)
+ release_region(ports->start, resource_size(ports));
+ else
+ release_mem_region(ports->start, resource_size(ports));
return retval;
}
-static void cmos_do_shutdown(void)
+static void cmos_do_shutdown(int rtc_irq)
{
spin_lock_irq(&rtc_lock);
- cmos_irq_disable(&cmos_rtc, RTC_IRQMASK);
+ if (is_valid_irq(rtc_irq))
+ cmos_irq_disable(&cmos_rtc, RTC_IRQMASK);
spin_unlock_irq(&rtc_lock);
}
-static void __exit cmos_do_remove(struct device *dev)
+static void cmos_do_remove(struct device *dev)
{
struct cmos_rtc *cmos = dev_get_drvdata(dev);
struct resource *ports;
- cmos_do_shutdown();
-
- sysfs_remove_bin_file(&dev->kobj, &nvram);
+ cmos_do_shutdown(cmos->irq);
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);
}
- rtc_device_unregister(cmos->rtc);
+ if (!dev_get_platdata(dev))
+ acpi_rtc_event_cleanup();
+
cmos->rtc = NULL;
ports = cmos->iomem;
- release_region(ports->start, resource_size(ports));
+ if (RTC_IOMAPPED)
+ release_region(ports->start, resource_size(ports));
+ else
+ release_mem_region(ports->start, resource_size(ports));
cmos->iomem = NULL;
cmos->dev = NULL;
- dev_set_drvdata(dev, NULL);
}
-#ifdef CONFIG_PM
+static int cmos_aie_poweroff(struct device *dev)
+{
+ struct cmos_rtc *cmos = dev_get_drvdata(dev);
+ struct rtc_time now;
+ time64_t t_now;
+ int retval = 0;
+ unsigned char rtc_control;
+
+ if (!cmos->alarm_expires)
+ return -EINVAL;
+
+ spin_lock_irq(&rtc_lock);
+ rtc_control = CMOS_READ(RTC_CONTROL);
+ spin_unlock_irq(&rtc_lock);
+
+ /* We only care about the situation where AIE is disabled. */
+ if (rtc_control & RTC_AIE)
+ return -EBUSY;
+
+ cmos_read_time(dev, &now);
+ t_now = rtc_tm_to_time64(&now);
+
+ /*
+ * When enabling "RTC wake-up" in BIOS setup, the machine reboots
+ * automatically right after shutdown on some buggy boxes.
+ * This automatic rebooting issue won't happen when the alarm
+ * time is larger than now+1 seconds.
+ *
+ * If the alarm time is equal to now+1 seconds, the issue can be
+ * prevented by cancelling the alarm.
+ */
+ if (cmos->alarm_expires == t_now + 1) {
+ struct rtc_wkalrm alarm;
+
+ /* Cancel the AIE timer by configuring the past time. */
+ rtc_time64_to_tm(t_now - 1, &alarm.time);
+ alarm.enabled = 0;
+ retval = cmos_set_alarm(dev, &alarm);
+ } else if (cmos->alarm_expires > t_now + 1) {
+ retval = -EBUSY;
+ }
+
+ return retval;
+}
static int cmos_suspend(struct device *dev)
{
@@ -811,13 +1240,13 @@ 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) && !cmos_use_acpi_alarm()) {
cmos->enabled_wake = 1;
if (cmos->wake_on)
cmos->wake_on(dev);
@@ -825,6 +1254,9 @@ static int cmos_suspend(struct device *dev)
enable_irq_wake(cmos->irq);
}
+ memset(&cmos->saved_wkalrm, 0, sizeof(struct rtc_wkalrm));
+ cmos_read_alarm(dev, &cmos->saved_wkalrm);
+
dev_dbg(dev, "suspend%s, ctrl %02x\n",
(tmp & RTC_AIE) ? ", alarm may wake" : "",
tmp);
@@ -840,15 +1272,53 @@ static int cmos_suspend(struct device *dev)
*/
static inline int cmos_poweroff(struct device *dev)
{
+ if (!IS_ENABLED(CONFIG_PM))
+ return -ENOSYS;
+
return cmos_suspend(dev);
}
-static int cmos_resume(struct device *dev)
+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 && cmos_use_acpi_alarm()) {
+ cmos_interrupt(0, (void *)cmos->rtc);
+ return;
+ }
+
+ memset(&current_alarm, 0, sizeof(struct rtc_wkalrm));
+ cmos_read_alarm(dev, &current_alarm);
+ t_current_expires = rtc_tm_to_time64(&current_alarm.time);
+ t_saved_expires = rtc_tm_to_time64(&cmos->saved_wkalrm.time);
+ if (t_current_expires != t_saved_expires ||
+ cmos->saved_wkalrm.enabled != current_alarm.enabled) {
+ cmos_set_alarm(dev, &cmos->saved_wkalrm);
+ }
+}
+
+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 && !cmos_use_acpi_alarm()) {
if (cmos->wake_off)
cmos->wake_off(dev);
else
@@ -856,6 +1326,9 @@ static int cmos_resume(struct device *dev)
cmos->enabled_wake = 0;
}
+ /* The BIOS might have changed the alarm, restore it */
+ cmos_check_wkalrm(dev);
+
spin_lock_irq(&rtc_lock);
tmp = cmos->suspend_ctrl;
cmos->suspend_ctrl = 0;
@@ -863,16 +1336,17 @@ static int 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
@@ -882,6 +1356,9 @@ static int cmos_resume(struct device *dev)
tmp &= ~RTC_AIE;
hpet_mask_rtc_irq_bit(RTC_AIE);
} while (mask & RTC_AIE);
+
+ if (tmp & RTC_AIE)
+ cmos_check_acpi_rtc_status(dev, &tmp);
}
spin_unlock_irq(&rtc_lock);
@@ -892,15 +1369,6 @@ static int cmos_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(cmos_pm_ops, cmos_suspend, cmos_resume);
-#else
-
-static inline int cmos_poweroff(struct device *dev)
-{
- return -ENOSYS;
-}
-
-#endif
-
/*----------------------------------------------------------------*/
/* On non-x86 systems, a "CMOS" RTC lives most naturally on platform_bus.
@@ -911,136 +1379,49 @@ static inline int cmos_poweroff(struct device *dev)
* predate even PNPBIOS should set up platform_bus devices.
*/
-#ifdef CONFIG_ACPI
-
-#include <linux/acpi.h>
-
-static u32 rtc_handler(void *context)
-{
- struct device *dev = context;
-
- pm_wakeup_event(dev, 0);
- acpi_clear_event(ACPI_EVENT_RTC);
- acpi_disable_event(ACPI_EVENT_RTC, 0);
- return ACPI_INTERRUPT_HANDLED;
-}
-
-static inline void rtc_wake_setup(struct device *dev)
-{
- acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, dev);
- /*
- * After the RTC handler is installed, the Fixed_RTC event should
- * be disabled. Only when the RTC alarm is set will it be enabled.
- */
- acpi_clear_event(ACPI_EVENT_RTC);
- acpi_disable_event(ACPI_EVENT_RTC, 0);
-}
-
-static void rtc_wake_on(struct device *dev)
-{
- acpi_clear_event(ACPI_EVENT_RTC);
- acpi_enable_event(ACPI_EVENT_RTC, 0);
-}
-
-static void rtc_wake_off(struct device *dev)
-{
- acpi_disable_event(ACPI_EVENT_RTC, 0);
-}
-
-/* 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
- * that this board's RTC is wakeup-capable (per ACPI spec).
- */
-static struct cmos_rtc_board_info acpi_rtc_info;
-
-static void cmos_wake_setup(struct device *dev)
-{
- if (acpi_disabled)
- return;
-
- rtc_wake_setup(dev);
- acpi_rtc_info.wake_on = rtc_wake_on;
- acpi_rtc_info.wake_off = rtc_wake_off;
-
- /* workaround bug in some ACPI tables */
- if (acpi_gbl_FADT.month_alarm && !acpi_gbl_FADT.day_alarm) {
- dev_dbg(dev, "bogus FADT month_alarm (%d)\n",
- acpi_gbl_FADT.month_alarm);
- acpi_gbl_FADT.month_alarm = 0;
- }
-
- acpi_rtc_info.rtc_day_alarm = acpi_gbl_FADT.day_alarm;
- acpi_rtc_info.rtc_mon_alarm = acpi_gbl_FADT.month_alarm;
- acpi_rtc_info.rtc_century = acpi_gbl_FADT.century;
-
- /* NOTE: S4_RTC_WAKE is NOT currently useful to Linux */
- if (acpi_gbl_FADT.flags & ACPI_FADT_S4_RTC_WAKE)
- dev_info(dev, "RTC can wake from S4\n");
-
- dev->platform_data = &acpi_rtc_info;
-
- /* RTC always wakes from S1/S2/S3, and often S4/STD */
- device_init_wakeup(dev, 1);
-}
-
-#else
-
-static void cmos_wake_setup(struct device *dev)
-{
-}
-
-#endif
-
#ifdef CONFIG_PNP
#include <linux/pnp.h>
static int cmos_pnp_probe(struct pnp_dev *pnp, const struct pnp_device_id *id)
{
- cmos_wake_setup(&pnp->dev);
+ int irq;
- if (pnp_port_start(pnp, 0) == 0x70 && !pnp_irq_valid(pnp, 0))
+ if (pnp_port_start(pnp, 0) == 0x70 && !pnp_irq_valid(pnp, 0)) {
+ irq = 0;
+#ifdef CONFIG_X86
/* Some machines contain a PNP entry for the RTC, but
* don't define the IRQ. It should always be safe to
- * hardcode it in these cases
+ * hardcode it on systems with a legacy PIC.
*/
- return cmos_do_probe(&pnp->dev,
- pnp_get_resource(pnp, IORESOURCE_IO, 0), 8);
- else
- return cmos_do_probe(&pnp->dev,
- pnp_get_resource(pnp, IORESOURCE_IO, 0),
- pnp_irq(pnp, 0));
-}
+ if (nr_legacy_irqs())
+ irq = RTC_IRQ;
+#endif
+ } else {
+ irq = pnp_irq(pnp, 0);
+ }
-static void __exit cmos_pnp_remove(struct pnp_dev *pnp)
-{
- cmos_do_remove(&pnp->dev);
+ return cmos_do_probe(&pnp->dev, pnp_get_resource(pnp, IORESOURCE_IO, 0), irq);
}
-#ifdef CONFIG_PM
-
-static int cmos_pnp_suspend(struct pnp_dev *pnp, pm_message_t mesg)
+static void cmos_pnp_remove(struct pnp_dev *pnp)
{
- return cmos_suspend(&pnp->dev);
+ cmos_do_remove(&pnp->dev);
}
-static int cmos_pnp_resume(struct pnp_dev *pnp)
+static void cmos_pnp_shutdown(struct pnp_dev *pnp)
{
- return cmos_resume(&pnp->dev);
-}
+ struct device *dev = &pnp->dev;
+ struct cmos_rtc *cmos = dev_get_drvdata(dev);
-#else
-#define cmos_pnp_suspend NULL
-#define cmos_pnp_resume NULL
-#endif
+ if (system_state == SYSTEM_POWER_OFF) {
+ int retval = cmos_poweroff(dev);
-static void cmos_pnp_shutdown(struct pnp_dev *pnp)
-{
- if (system_state == SYSTEM_POWER_OFF && !cmos_poweroff(&pnp->dev))
- return;
+ if (cmos_aie_poweroff(dev) < 0 && !retval)
+ return;
+ }
- cmos_do_shutdown();
+ cmos_do_shutdown(cmos->irq);
}
static const struct pnp_device_id rtc_ids[] = {
@@ -1052,16 +1433,17 @@ static const struct pnp_device_id rtc_ids[] = {
MODULE_DEVICE_TABLE(pnp, rtc_ids);
static struct pnp_driver cmos_pnp_driver = {
- .name = (char *) driver_name,
+ .name = driver_name,
.id_table = rtc_ids,
.probe = cmos_pnp_probe,
- .remove = __exit_p(cmos_pnp_remove),
+ .remove = cmos_pnp_remove,
.shutdown = cmos_pnp_shutdown,
/* flag ensures resume() gets called, and stops syslog spam */
.flags = PNP_DRIVER_RES_DO_NOT_CHANGE,
- .suspend = cmos_pnp_suspend,
- .resume = cmos_pnp_resume,
+ .driver = {
+ .pm = &cmos_pm_ops,
+ },
};
#endif /* CONFIG_PNP */
@@ -1078,8 +1460,6 @@ MODULE_DEVICE_TABLE(of, of_cmos_match);
static __init void cmos_of_init(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
- struct rtc_time time;
- int ret;
const __be32 *val;
if (!node)
@@ -1092,16 +1472,6 @@ static __init void cmos_of_init(struct platform_device *pdev)
val = of_get_property(node, "freq-reg", NULL);
if (val)
CMOS_WRITE(be32_to_cpup(val), RTC_FREQ_SELECT);
-
- get_rtc_time(&time);
- ret = rtc_valid_tm(&time);
- if (ret) {
- struct rtc_time def_time = {
- .tm_year = 1,
- .tm_mday = 1,
- };
- set_rtc_time(&def_time);
- }
}
#else
static inline void cmos_of_init(struct platform_device *pdev) {}
@@ -1114,38 +1484,51 @@ static inline void cmos_of_init(struct platform_device *pdev) {}
static int __init cmos_platform_probe(struct platform_device *pdev)
{
+ struct resource *resource;
+ int irq;
+
cmos_of_init(pdev);
- cmos_wake_setup(&pdev->dev);
- return cmos_do_probe(&pdev->dev,
- platform_get_resource(pdev, IORESOURCE_IO, 0),
- platform_get_irq(pdev, 0));
+
+ if (RTC_IOMAPPED)
+ resource = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ else
+ resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ irq = -1;
+
+ return cmos_do_probe(&pdev->dev, resource, irq);
}
-static int __exit cmos_platform_remove(struct platform_device *pdev)
+static void cmos_platform_remove(struct platform_device *pdev)
{
cmos_do_remove(&pdev->dev);
- return 0;
}
static void cmos_platform_shutdown(struct platform_device *pdev)
{
- if (system_state == SYSTEM_POWER_OFF && !cmos_poweroff(&pdev->dev))
- return;
+ struct device *dev = &pdev->dev;
+ struct cmos_rtc *cmos = dev_get_drvdata(dev);
+
+ if (system_state == SYSTEM_POWER_OFF) {
+ int retval = cmos_poweroff(dev);
- cmos_do_shutdown();
+ if (cmos_aie_poweroff(dev) < 0 && !retval)
+ return;
+ }
+
+ cmos_do_shutdown(cmos->irq);
}
/* work with hotplug and coldplug */
MODULE_ALIAS("platform:rtc_cmos");
static struct platform_driver cmos_platform_driver = {
- .remove = __exit_p(cmos_platform_remove),
+ .remove = cmos_platform_remove,
.shutdown = cmos_platform_shutdown,
.driver = {
- .name = (char *) driver_name,
-#ifdef CONFIG_PM
+ .name = driver_name,
.pm = &cmos_pm_ops,
-#endif
.of_match_table = of_match_ptr(of_cmos_match),
}
};
generated by cgit (git 2.34.1) at 2025-12-21 21:47:50 +0000