From 95099d4622f8cb224d94e314c7a8e0df60b13f87 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Sat, 09 Dec 2023 08:38:01 +0000
Subject: [PATCH] enable docker ppp
---
kernel/drivers/rtc/rtc-cmos.c | 224 +++++++++++++++++++++++++++++++++++--------------------
1 files changed, 141 insertions(+), 83 deletions(-)
diff --git a/kernel/drivers/rtc/rtc-cmos.c b/kernel/drivers/rtc/rtc-cmos.c
index 8545f0d..d4f6c4d 100644
--- a/kernel/drivers/rtc/rtc-cmos.c
+++ b/kernel/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.
*/
/*
@@ -226,6 +222,8 @@
static int cmos_read_time(struct device *dev, struct rtc_time *t)
{
+ 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.
@@ -233,29 +231,64 @@
if (!pm_trace_rtc_valid())
return -EIO;
- /* REVISIT: if the clock has a "century" register, use
- * that instead of the heuristic in mc146818_get_time().
- * That'll make Y3K compatility (year > 2070) easy!
- */
- mc146818_get_time(t);
+ ret = mc146818_get_time(t);
+ 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 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))
@@ -266,28 +299,18 @@
* the future.
*/
- 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);
+ /* 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, &p))
+ return -EIO;
- 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);
-
- 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
@@ -316,7 +339,7 @@
}
}
- t->enabled = !!(rtc_control & RTC_AIE);
+ t->enabled = !!(p.rtc_control & RTC_AIE);
t->pending = 0;
return 0;
@@ -447,10 +470,57 @@
return 0;
}
+struct cmos_set_alarm_callback_param {
+ struct cmos_rtc *cmos;
+ unsigned char mon, mday, hrs, min, sec;
+ struct rtc_wkalrm *t;
+};
+
+/* 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(p->cmos, RTC_AIE);
+
+ /* update 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 (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);
+ }
+
+ 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 (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);
- unsigned char mon, mday, hrs, min, sec, rtc_control;
+ 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 */
@@ -461,11 +531,11 @@
if (ret < 0)
return ret;
- 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;
+ 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);
@@ -473,43 +543,21 @@
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;
+ 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;
}
- spin_lock_irq(&rtc_lock);
-
- /* next rtc irq must not be from previous alarm setting */
- cmos_irq_disable(cmos, RTC_AIE);
-
- /* update alarm */
- CMOS_WRITE(hrs, RTC_HOURS_ALARM);
- CMOS_WRITE(min, RTC_MINUTES_ALARM);
- CMOS_WRITE(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 (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);
-
- spin_unlock_irq(&rtc_lock);
+ /*
+ * 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, &p))
+ return -EIO;
cmos->alarm_expires = rtc_tm_to_time64(&t->time);
@@ -809,6 +857,12 @@
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);
if (!(flags & CMOS_RTC_FLAGS_NOFREQ)) {
@@ -1012,6 +1066,7 @@
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",
@@ -1056,10 +1111,13 @@
* ACK the rtc irq here
*/
if (t_now >= cmos->alarm_expires && cmos_use_acpi_alarm()) {
+ local_irq_disable();
cmos_interrupt(0, (void *)cmos->rtc);
+ local_irq_enable();
return;
}
+ memset(¤t_alarm, 0, sizeof(struct rtc_wkalrm));
cmos_read_alarm(dev, ¤t_alarm);
t_current_expires = rtc_tm_to_time64(¤t_alarm.time);
t_saved_expires = rtc_tm_to_time64(&cmos->saved_wkalrm.time);
@@ -1204,8 +1262,6 @@
/* 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;
@@ -1215,8 +1271,10 @@
if (!is_hpet_enabled())
return;
- if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year >= 2015)
- use_acpi_alarm = true;
+ if (dmi_get_bios_year() < 2015)
+ return;
+
+ use_acpi_alarm = true;
}
#else
static inline void use_acpi_alarm_quirks(void) { }
@@ -1312,7 +1370,7 @@
* hardcode it on systems with a legacy PIC.
*/
if (nr_legacy_irqs())
- irq = 8;
+ irq = RTC_IRQ;
#endif
return cmos_do_probe(&pnp->dev,
pnp_get_resource(pnp, IORESOURCE_IO, 0), irq);
@@ -1352,7 +1410,7 @@
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 = cmos_pnp_remove,
--
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