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Message-ID: <20080602173842.GD30705@polina.dev.rtsoft.ru>
Date: Mon, 2 Jun 2008 21:38:42 +0400
From: Anton Vorontsov <avorontsov@...mvista.com>
To: Kumar Gala <galak@...nel.crashing.org>,
Wim Van Sebroeck <wim@...ana.be>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Jochen Friedrich <jochen@...am.de>,
Stephen Rothwell <sfr@...b.auug.org.au>,
Segher Boessenkool <segher@...nel.crashing.org>,
Scott Wood <scottwood@...escale.com>, linuxppc-dev@...abs.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 4/8] [WATCHDOG] mpc83xx_wdt: rename to mpc8xxx_wdt
Rename the driver because now we support some MPC86xx processors.
There are no changes to the mpc83xx_wdt.c file, yet. When possible, we do
file renames and changes separately (because Linus once asked so, because
it helps git to track the renamed files).
Signed-off-by: Anton Vorontsov <avorontsov@...mvista.com>
---
drivers/watchdog/Kconfig | 11 ++-
drivers/watchdog/Makefile | 2 +-
drivers/watchdog/mpc83xx_wdt.c | 294 ----------------------------------------
drivers/watchdog/mpc8xxx_wdt.c | 294 ++++++++++++++++++++++++++++++++++++++++
4 files changed, 304 insertions(+), 297 deletions(-)
delete mode 100644 drivers/watchdog/mpc83xx_wdt.c
create mode 100644 drivers/watchdog/mpc8xxx_wdt.c
diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 2929055..008eaa6 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -682,9 +682,16 @@ config 8xx_WDT
tristate "MPC8xx Watchdog Timer"
depends on 8xx
-config 83xx_WDT
- tristate "MPC83xx/MPC86xx Watchdog Timer"
+config 8xxx_WDT
+ tristate "MPC8xxx Platform Watchdog Timer"
depends on PPC_83xx || PPC_86xx
+ help
+ This driver is for a SoC level watchdog that exists on some
+ Freescale PowerPC processors. So far this driver supports:
+ - MPC83xx watchdogs
+ - MPC86xx watchdogs
+
+ For BookE processors (MPC85xx) use the BOOKE_WDT driver instead.
config MV64X60_WDT
tristate "MV64X60 (Marvell Discovery) Watchdog Timer"
diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
index f3fb170..d5782f9 100644
--- a/drivers/watchdog/Makefile
+++ b/drivers/watchdog/Makefile
@@ -102,7 +102,7 @@ obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
# POWERPC Architecture
obj-$(CONFIG_8xx_WDT) += mpc8xx_wdt.o
obj-$(CONFIG_MPC5200_WDT) += mpc5200_wdt.o
-obj-$(CONFIG_83xx_WDT) += mpc83xx_wdt.o
+obj-$(CONFIG_8xxx_WDT) += mpc8xxx_wdt.o
obj-$(CONFIG_MV64X60_WDT) += mv64x60_wdt.o
obj-$(CONFIG_BOOKE_WDT) += booke_wdt.o
diff --git a/drivers/watchdog/mpc83xx_wdt.c b/drivers/watchdog/mpc83xx_wdt.c
deleted file mode 100644
index 19e3082..0000000
--- a/drivers/watchdog/mpc83xx_wdt.c
+++ /dev/null
@@ -1,294 +0,0 @@
-/*
- * mpc83xx_wdt.c - MPC83xx/MPC86xx watchdog userspace interface
- *
- * Authors: Dave Updegraff <dave@...y.org>
- * Kumar Gala <galak@...nel.crashing.org>
- * Attribution: from 83xx_wst: Florian Schirmer <jolt@...box.org>
- * ..and from sc520_wdt
- * Copyright (c) 2008 MontaVista Software, Inc.
- * Anton Vorontsov <avorontsov@...mvista.com>
- *
- * Note: it appears that you can only actually ENABLE or DISABLE the thing
- * once after POR. Once enabled, you cannot disable, and vice versa.
- *
- * 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.
- */
-
-#include <linux/fs.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/timer.h>
-#include <linux/miscdevice.h>
-#include <linux/of_platform.h>
-#include <linux/module.h>
-#include <linux/watchdog.h>
-#include <linux/io.h>
-#include <linux/uaccess.h>
-#include <sysdev/fsl_soc.h>
-
-struct mpc83xx_wdt {
- __be32 res0;
- __be32 swcrr; /* System watchdog control register */
-#define SWCRR_SWTC 0xFFFF0000 /* Software Watchdog Time Count. */
-#define SWCRR_SWEN 0x00000004 /* Watchdog Enable bit. */
-#define SWCRR_SWRI 0x00000002 /* Software Watchdog Reset/Interrupt Select bit.*/
-#define SWCRR_SWPR 0x00000001 /* Software Watchdog Counter Prescale bit. */
- __be32 swcnr; /* System watchdog count register */
- u8 res1[2];
- __be16 swsrr; /* System watchdog service register */
- u8 res2[0xF0];
-};
-
-struct mpc83xx_wdt_type {
- int prescaler;
- bool hw_enabled;
-};
-
-static struct mpc83xx_wdt __iomem *wd_base;
-
-static u16 timeout = 0xffff;
-module_param(timeout, ushort, 0);
-MODULE_PARM_DESC(timeout, "Watchdog timeout in ticks. "
- "(0<timeout<65536, default=65535");
-
-static int reset = 1;
-module_param(reset, bool, 0);
-MODULE_PARM_DESC(reset, "Watchdog Interrupt/Reset Mode. "
- "0 = interrupt, 1 = reset");
-
-static int nowayout = WATCHDOG_NOWAYOUT;
-module_param(nowayout, int, 0);
-MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
- "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
-
-/*
- * We always prescale, but if someone really doesn't want to they can set this
- * to 0
- */
-static int prescale = 1;
-static unsigned int timeout_sec;
-
-static unsigned long wdt_is_open;
-static DEFINE_SPINLOCK(wdt_spinlock);
-
-static void mpc83xx_wdt_keepalive(void)
-{
- /* Ping the WDT */
- spin_lock(&wdt_spinlock);
- out_be16(&wd_base->swsrr, 0x556c);
- out_be16(&wd_base->swsrr, 0xaa39);
- spin_unlock(&wdt_spinlock);
-}
-
-static void mpc83xx_wdt_timer_ping(unsigned long arg);
-static DEFINE_TIMER(wdt_timer, mpc83xx_wdt_timer_ping, 0, 0);
-
-static void mpc83xx_wdt_timer_ping(unsigned long arg)
-{
- mpc83xx_wdt_keepalive();
- /* We're pinging it twice faster than needed, just to be sure. */
- mod_timer(&wdt_timer, jiffies + HZ * timeout_sec / 2);
-}
-
-static void mpc83xx_wdt_pr_warn(const char *msg)
-{
- pr_crit("mpc83xx_wdt: %s, expect the %s soon!\n", msg,
- reset ? "reset" : "machine check exception");
-}
-
-static ssize_t mpc83xx_wdt_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- if (count)
- mpc83xx_wdt_keepalive();
- return count;
-}
-
-static int mpc83xx_wdt_open(struct inode *inode, struct file *file)
-{
- u32 tmp = SWCRR_SWEN;
- if (test_and_set_bit(0, &wdt_is_open))
- return -EBUSY;
-
- /* Once we start the watchdog we can't stop it */
- if (nowayout)
- __module_get(THIS_MODULE);
-
- /* Good, fire up the show */
- if (prescale)
- tmp |= SWCRR_SWPR;
- if (reset)
- tmp |= SWCRR_SWRI;
-
- tmp |= timeout << 16;
-
- out_be32(&wd_base->swcrr, tmp);
-
- del_timer_sync(&wdt_timer);
-
- return nonseekable_open(inode, file);
-}
-
-static int mpc83xx_wdt_release(struct inode *inode, struct file *file)
-{
- if (!nowayout)
- mpc83xx_wdt_timer_ping(0);
- else
- mpc83xx_wdt_pr_warn("watchdog closed");
- clear_bit(0, &wdt_is_open);
- return 0;
-}
-
-static int mpc83xx_wdt_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- void __user *argp = (void __user *)arg;
- int __user *p = argp;
- static struct watchdog_info ident = {
- .options = WDIOF_KEEPALIVEPING,
- .firmware_version = 1,
- .identity = "MPC83xx",
- };
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- return put_user(0, p);
- case WDIOC_KEEPALIVE:
- mpc83xx_wdt_keepalive();
- return 0;
- case WDIOC_GETTIMEOUT:
- return put_user(timeout_sec, p);
- default:
- return -ENOTTY;
- }
-}
-
-static const struct file_operations mpc83xx_wdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = mpc83xx_wdt_write,
- .ioctl = mpc83xx_wdt_ioctl,
- .open = mpc83xx_wdt_open,
- .release = mpc83xx_wdt_release,
-};
-
-static struct miscdevice mpc83xx_wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &mpc83xx_wdt_fops,
-};
-
-static int __devinit mpc83xx_wdt_probe(struct of_device *ofdev,
- const struct of_device_id *match)
-{
- int ret;
- struct device_node *np = ofdev->node;
- struct mpc83xx_wdt_type *wdt_type = match->data;
- u32 freq = fsl_get_sys_freq();
- bool enabled;
-
- if (!freq || freq == -1)
- return -EINVAL;
-
- wd_base = of_iomap(np, 0);
- if (!wd_base)
- return -ENOMEM;
-
- enabled = in_be32(&wd_base->swcrr) & SWCRR_SWEN;
- if (!enabled && wdt_type->hw_enabled) {
- pr_info("mpc83xx_wdt: could not be enabled in software\n");
- ret = -ENOSYS;
- goto err_unmap;
- }
-
- ret = misc_register(&mpc83xx_wdt_miscdev);
- if (ret) {
- pr_err("cannot register miscdev on minor=%d (err=%d)\n",
- WATCHDOG_MINOR, ret);
- goto err_unmap;
- }
-
- /* Calculate the timeout in seconds */
- if (prescale)
- timeout_sec = (timeout * wdt_type->prescaler) / freq;
- else
- timeout_sec = timeout / freq;
-
- pr_info("WDT driver for MPC83xx initialized. mode:%s timeout=%d "
- "(%d seconds)\n", reset ? "reset" : "interrupt", timeout,
- timeout_sec);
-
- /*
- * If the watchdog was previously enabled or we're running on
- * MPC86xx, we should ping the wdt from the kernel until the
- * userspace handles it.
- */
- if (enabled)
- mpc83xx_wdt_timer_ping(0);
- return 0;
-err_unmap:
- iounmap(wd_base);
- return ret;
-}
-
-static int __devexit mpc83xx_wdt_remove(struct of_device *ofdev)
-{
- mpc83xx_wdt_pr_warn("watchdog removed");
- del_timer_sync(&wdt_timer);
- misc_deregister(&mpc83xx_wdt_miscdev);
- iounmap(wd_base);
-
- return 0;
-}
-
-static const struct of_device_id mpc83xx_wdt_match[] = {
- {
- .compatible = "mpc83xx_wdt",
- .data = &(struct mpc83xx_wdt_type) {
- .prescaler = 0x10000,
- },
- },
- {
- .compatible = "fsl,mpc8610-wdt",
- .data = &(struct mpc83xx_wdt_type) {
- .prescaler = 0x10000,
- .hw_enabled = true,
- },
- },
- {},
-};
-MODULE_DEVICE_TABLE(of, mpc83xx_wdt_match);
-
-static struct of_platform_driver mpc83xx_wdt_driver = {
- .match_table = mpc83xx_wdt_match,
- .probe = mpc83xx_wdt_probe,
- .remove = __devexit_p(mpc83xx_wdt_remove),
- .driver = {
- .name = "mpc83xx_wdt",
- .owner = THIS_MODULE,
- },
-};
-
-static int __init mpc83xx_wdt_init(void)
-{
- return of_register_platform_driver(&mpc83xx_wdt_driver);
-}
-
-static void __exit mpc83xx_wdt_exit(void)
-{
- of_unregister_platform_driver(&mpc83xx_wdt_driver);
-}
-
-subsys_initcall(mpc83xx_wdt_init);
-module_exit(mpc83xx_wdt_exit);
-
-MODULE_AUTHOR("Dave Updegraff, Kumar Gala");
-MODULE_DESCRIPTION("Driver for watchdog timer in MPC83xx/MPC86xx uProcessors");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
diff --git a/drivers/watchdog/mpc8xxx_wdt.c b/drivers/watchdog/mpc8xxx_wdt.c
new file mode 100644
index 0000000..19e3082
--- /dev/null
+++ b/drivers/watchdog/mpc8xxx_wdt.c
@@ -0,0 +1,294 @@
+/*
+ * mpc83xx_wdt.c - MPC83xx/MPC86xx watchdog userspace interface
+ *
+ * Authors: Dave Updegraff <dave@...y.org>
+ * Kumar Gala <galak@...nel.crashing.org>
+ * Attribution: from 83xx_wst: Florian Schirmer <jolt@...box.org>
+ * ..and from sc520_wdt
+ * Copyright (c) 2008 MontaVista Software, Inc.
+ * Anton Vorontsov <avorontsov@...mvista.com>
+ *
+ * Note: it appears that you can only actually ENABLE or DISABLE the thing
+ * once after POR. Once enabled, you cannot disable, and vice versa.
+ *
+ * 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.
+ */
+
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/miscdevice.h>
+#include <linux/of_platform.h>
+#include <linux/module.h>
+#include <linux/watchdog.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+#include <sysdev/fsl_soc.h>
+
+struct mpc83xx_wdt {
+ __be32 res0;
+ __be32 swcrr; /* System watchdog control register */
+#define SWCRR_SWTC 0xFFFF0000 /* Software Watchdog Time Count. */
+#define SWCRR_SWEN 0x00000004 /* Watchdog Enable bit. */
+#define SWCRR_SWRI 0x00000002 /* Software Watchdog Reset/Interrupt Select bit.*/
+#define SWCRR_SWPR 0x00000001 /* Software Watchdog Counter Prescale bit. */
+ __be32 swcnr; /* System watchdog count register */
+ u8 res1[2];
+ __be16 swsrr; /* System watchdog service register */
+ u8 res2[0xF0];
+};
+
+struct mpc83xx_wdt_type {
+ int prescaler;
+ bool hw_enabled;
+};
+
+static struct mpc83xx_wdt __iomem *wd_base;
+
+static u16 timeout = 0xffff;
+module_param(timeout, ushort, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in ticks. "
+ "(0<timeout<65536, default=65535");
+
+static int reset = 1;
+module_param(reset, bool, 0);
+MODULE_PARM_DESC(reset, "Watchdog Interrupt/Reset Mode. "
+ "0 = interrupt, 1 = reset");
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
+ "(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+/*
+ * We always prescale, but if someone really doesn't want to they can set this
+ * to 0
+ */
+static int prescale = 1;
+static unsigned int timeout_sec;
+
+static unsigned long wdt_is_open;
+static DEFINE_SPINLOCK(wdt_spinlock);
+
+static void mpc83xx_wdt_keepalive(void)
+{
+ /* Ping the WDT */
+ spin_lock(&wdt_spinlock);
+ out_be16(&wd_base->swsrr, 0x556c);
+ out_be16(&wd_base->swsrr, 0xaa39);
+ spin_unlock(&wdt_spinlock);
+}
+
+static void mpc83xx_wdt_timer_ping(unsigned long arg);
+static DEFINE_TIMER(wdt_timer, mpc83xx_wdt_timer_ping, 0, 0);
+
+static void mpc83xx_wdt_timer_ping(unsigned long arg)
+{
+ mpc83xx_wdt_keepalive();
+ /* We're pinging it twice faster than needed, just to be sure. */
+ mod_timer(&wdt_timer, jiffies + HZ * timeout_sec / 2);
+}
+
+static void mpc83xx_wdt_pr_warn(const char *msg)
+{
+ pr_crit("mpc83xx_wdt: %s, expect the %s soon!\n", msg,
+ reset ? "reset" : "machine check exception");
+}
+
+static ssize_t mpc83xx_wdt_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ if (count)
+ mpc83xx_wdt_keepalive();
+ return count;
+}
+
+static int mpc83xx_wdt_open(struct inode *inode, struct file *file)
+{
+ u32 tmp = SWCRR_SWEN;
+ if (test_and_set_bit(0, &wdt_is_open))
+ return -EBUSY;
+
+ /* Once we start the watchdog we can't stop it */
+ if (nowayout)
+ __module_get(THIS_MODULE);
+
+ /* Good, fire up the show */
+ if (prescale)
+ tmp |= SWCRR_SWPR;
+ if (reset)
+ tmp |= SWCRR_SWRI;
+
+ tmp |= timeout << 16;
+
+ out_be32(&wd_base->swcrr, tmp);
+
+ del_timer_sync(&wdt_timer);
+
+ return nonseekable_open(inode, file);
+}
+
+static int mpc83xx_wdt_release(struct inode *inode, struct file *file)
+{
+ if (!nowayout)
+ mpc83xx_wdt_timer_ping(0);
+ else
+ mpc83xx_wdt_pr_warn("watchdog closed");
+ clear_bit(0, &wdt_is_open);
+ return 0;
+}
+
+static int mpc83xx_wdt_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ void __user *argp = (void __user *)arg;
+ int __user *p = argp;
+ static struct watchdog_info ident = {
+ .options = WDIOF_KEEPALIVEPING,
+ .firmware_version = 1,
+ .identity = "MPC83xx",
+ };
+
+ switch (cmd) {
+ case WDIOC_GETSUPPORT:
+ return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
+ case WDIOC_GETSTATUS:
+ case WDIOC_GETBOOTSTATUS:
+ return put_user(0, p);
+ case WDIOC_KEEPALIVE:
+ mpc83xx_wdt_keepalive();
+ return 0;
+ case WDIOC_GETTIMEOUT:
+ return put_user(timeout_sec, p);
+ default:
+ return -ENOTTY;
+ }
+}
+
+static const struct file_operations mpc83xx_wdt_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .write = mpc83xx_wdt_write,
+ .ioctl = mpc83xx_wdt_ioctl,
+ .open = mpc83xx_wdt_open,
+ .release = mpc83xx_wdt_release,
+};
+
+static struct miscdevice mpc83xx_wdt_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &mpc83xx_wdt_fops,
+};
+
+static int __devinit mpc83xx_wdt_probe(struct of_device *ofdev,
+ const struct of_device_id *match)
+{
+ int ret;
+ struct device_node *np = ofdev->node;
+ struct mpc83xx_wdt_type *wdt_type = match->data;
+ u32 freq = fsl_get_sys_freq();
+ bool enabled;
+
+ if (!freq || freq == -1)
+ return -EINVAL;
+
+ wd_base = of_iomap(np, 0);
+ if (!wd_base)
+ return -ENOMEM;
+
+ enabled = in_be32(&wd_base->swcrr) & SWCRR_SWEN;
+ if (!enabled && wdt_type->hw_enabled) {
+ pr_info("mpc83xx_wdt: could not be enabled in software\n");
+ ret = -ENOSYS;
+ goto err_unmap;
+ }
+
+ ret = misc_register(&mpc83xx_wdt_miscdev);
+ if (ret) {
+ pr_err("cannot register miscdev on minor=%d (err=%d)\n",
+ WATCHDOG_MINOR, ret);
+ goto err_unmap;
+ }
+
+ /* Calculate the timeout in seconds */
+ if (prescale)
+ timeout_sec = (timeout * wdt_type->prescaler) / freq;
+ else
+ timeout_sec = timeout / freq;
+
+ pr_info("WDT driver for MPC83xx initialized. mode:%s timeout=%d "
+ "(%d seconds)\n", reset ? "reset" : "interrupt", timeout,
+ timeout_sec);
+
+ /*
+ * If the watchdog was previously enabled or we're running on
+ * MPC86xx, we should ping the wdt from the kernel until the
+ * userspace handles it.
+ */
+ if (enabled)
+ mpc83xx_wdt_timer_ping(0);
+ return 0;
+err_unmap:
+ iounmap(wd_base);
+ return ret;
+}
+
+static int __devexit mpc83xx_wdt_remove(struct of_device *ofdev)
+{
+ mpc83xx_wdt_pr_warn("watchdog removed");
+ del_timer_sync(&wdt_timer);
+ misc_deregister(&mpc83xx_wdt_miscdev);
+ iounmap(wd_base);
+
+ return 0;
+}
+
+static const struct of_device_id mpc83xx_wdt_match[] = {
+ {
+ .compatible = "mpc83xx_wdt",
+ .data = &(struct mpc83xx_wdt_type) {
+ .prescaler = 0x10000,
+ },
+ },
+ {
+ .compatible = "fsl,mpc8610-wdt",
+ .data = &(struct mpc83xx_wdt_type) {
+ .prescaler = 0x10000,
+ .hw_enabled = true,
+ },
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, mpc83xx_wdt_match);
+
+static struct of_platform_driver mpc83xx_wdt_driver = {
+ .match_table = mpc83xx_wdt_match,
+ .probe = mpc83xx_wdt_probe,
+ .remove = __devexit_p(mpc83xx_wdt_remove),
+ .driver = {
+ .name = "mpc83xx_wdt",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init mpc83xx_wdt_init(void)
+{
+ return of_register_platform_driver(&mpc83xx_wdt_driver);
+}
+
+static void __exit mpc83xx_wdt_exit(void)
+{
+ of_unregister_platform_driver(&mpc83xx_wdt_driver);
+}
+
+subsys_initcall(mpc83xx_wdt_init);
+module_exit(mpc83xx_wdt_exit);
+
+MODULE_AUTHOR("Dave Updegraff, Kumar Gala");
+MODULE_DESCRIPTION("Driver for watchdog timer in MPC83xx/MPC86xx uProcessors");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
--
1.5.5.1
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