Re: [PATCH] watchdog: remove pnx83xx driver

From: Guenter Roeck
Date: Fri Nov 06 2020 - 08:10:17 EST

On Fri, Nov 06, 2020 at 02:05:07PM +0100, Thomas Bogendoerfer wrote:
> Commit 625326ea9c84 ("MIPS: Remove PNX833x alias NXP_STB22x") removed
> support for PNX833x, so it's time to remove watchdog driver, too.
>
> Signed-off-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>

Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>

> ---
> drivers/watchdog/Kconfig | 10 --
> drivers/watchdog/Makefile | 1 -
> drivers/watchdog/pnx833x_wdt.c | 277 -----------------------------------------
> 3 files changed, 288 deletions(-)
> delete mode 100644 drivers/watchdog/pnx833x_wdt.c
>
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index fd7968635e6d..f045203f7ebf 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -1696,16 +1696,6 @@ config WDT_MTX1
> Hardware driver for the MTX-1 boards. This is a watchdog timer that
> will reboot the machine after a 100 seconds timer expired.
>
> -config PNX833X_WDT
> - tristate "PNX833x Hardware Watchdog"
> - depends on SOC_PNX8335
> - depends on BROKEN
> - help
> - Hardware driver for the PNX833x's watchdog. This is a
> - watchdog timer that will reboot the machine after a programmable
> - timer has expired and no process has written to /dev/watchdog during
> - that time.
> -
> config SIBYTE_WDOG
> tristate "Sibyte SoC hardware watchdog"
> depends on CPU_SB1 || (MIPS && COMPILE_TEST)
> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index 071a2e50be98..5c74ee19d441 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -161,7 +161,6 @@ obj-$(CONFIG_RC32434_WDT) += rc32434_wdt.o
> obj-$(CONFIG_INDYDOG) += indydog.o
> obj-$(CONFIG_JZ4740_WDT) += jz4740_wdt.o
> obj-$(CONFIG_WDT_MTX1) += mtx-1_wdt.o
> -obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt.o
> obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
> obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
> obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
> diff --git a/drivers/watchdog/pnx833x_wdt.c b/drivers/watchdog/pnx833x_wdt.c
> deleted file mode 100644
> index 4097d076aab8..000000000000
> --- a/drivers/watchdog/pnx833x_wdt.c
> +++ /dev/null
> @@ -1,277 +0,0 @@
> -// SPDX-License-Identifier: GPL-2.0-or-later
> -/*
> - * PNX833x Hardware Watchdog Driver
> - * Copyright 2008 NXP Semiconductors
> - * Daniel Laird <daniel.j.laird@xxxxxxx>
> - * Andre McCurdy <andre.mccurdy@xxxxxxx>
> - *
> - * Heavily based upon - IndyDog 0.3
> - * A Hardware Watchdog Device for SGI IP22
> - *
> - * (c) Copyright 2002 Guido Guenther <agx@xxxxxxxxxxx>, All Rights Reserved.
> - *
> - * based on softdog.c by Alan Cox <alan@xxxxxxxxxx>
> - */
> -
> -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> -
> -#include <linux/module.h>
> -#include <linux/moduleparam.h>
> -#include <linux/types.h>
> -#include <linux/kernel.h>
> -#include <linux/fs.h>
> -#include <linux/mm.h>
> -#include <linux/miscdevice.h>
> -#include <linux/watchdog.h>
> -#include <linux/notifier.h>
> -#include <linux/reboot.h>
> -#include <linux/init.h>
> -#include <asm/mach-pnx833x/pnx833x.h>
> -
> -#define WATCHDOG_TIMEOUT 30 /* 30 sec Maximum timeout */
> -#define WATCHDOG_COUNT_FREQUENCY 68000000U /* Watchdog counts at 68MHZ. */
> -#define PNX_WATCHDOG_TIMEOUT (WATCHDOG_TIMEOUT * WATCHDOG_COUNT_FREQUENCY)
> -#define PNX_TIMEOUT_VALUE 2040000000U
> -
> -/** CONFIG block */
> -#define PNX833X_CONFIG (0x07000U)
> -#define PNX833X_CONFIG_CPU_WATCHDOG (0x54)
> -#define PNX833X_CONFIG_CPU_WATCHDOG_COMPARE (0x58)
> -#define PNX833X_CONFIG_CPU_COUNTERS_CONTROL (0x1c)
> -
> -/** RESET block */
> -#define PNX833X_RESET (0x08000U)
> -#define PNX833X_RESET_CONFIG (0x08)
> -
> -static int pnx833x_wdt_alive;
> -
> -/* Set default timeout in MHZ.*/
> -static int pnx833x_wdt_timeout = PNX_WATCHDOG_TIMEOUT;
> -module_param(pnx833x_wdt_timeout, int, 0);
> -MODULE_PARM_DESC(timeout, "Watchdog timeout in Mhz. (68Mhz clock), default="
> - __MODULE_STRING(PNX_TIMEOUT_VALUE) "(30 seconds).");
> -
> -static bool nowayout = WATCHDOG_NOWAYOUT;
> -module_param(nowayout, bool, 0);
> -MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
> - __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
> -
> -#define START_DEFAULT 1
> -static int start_enabled = START_DEFAULT;
> -module_param(start_enabled, int, 0);
> -MODULE_PARM_DESC(start_enabled, "Watchdog is started on module insertion "
> - "(default=" __MODULE_STRING(START_DEFAULT) ")");
> -
> -static void pnx833x_wdt_start(void)
> -{
> - /* Enable watchdog causing reset. */
> - PNX833X_REG(PNX833X_RESET + PNX833X_RESET_CONFIG) |= 0x1;
> - /* Set timeout.*/
> - PNX833X_REG(PNX833X_CONFIG +
> - PNX833X_CONFIG_CPU_WATCHDOG_COMPARE) = pnx833x_wdt_timeout;
> - /* Enable watchdog. */
> - PNX833X_REG(PNX833X_CONFIG +
> - PNX833X_CONFIG_CPU_COUNTERS_CONTROL) |= 0x1;
> -
> - pr_info("Started watchdog timer\n");
> -}
> -
> -static void pnx833x_wdt_stop(void)
> -{
> - /* Disable watchdog causing reset. */
> - PNX833X_REG(PNX833X_RESET + PNX833X_CONFIG) &= 0xFFFFFFFE;
> - /* Disable watchdog.*/
> - PNX833X_REG(PNX833X_CONFIG +
> - PNX833X_CONFIG_CPU_COUNTERS_CONTROL) &= 0xFFFFFFFE;
> -
> - pr_info("Stopped watchdog timer\n");
> -}
> -
> -static void pnx833x_wdt_ping(void)
> -{
> - PNX833X_REG(PNX833X_CONFIG +
> - PNX833X_CONFIG_CPU_WATCHDOG_COMPARE) = pnx833x_wdt_timeout;
> -}
> -
> -/*
> - * Allow only one person to hold it open
> - */
> -static int pnx833x_wdt_open(struct inode *inode, struct file *file)
> -{
> - if (test_and_set_bit(0, &pnx833x_wdt_alive))
> - return -EBUSY;
> -
> - if (nowayout)
> - __module_get(THIS_MODULE);
> -
> - /* Activate timer */
> - if (!start_enabled)
> - pnx833x_wdt_start();
> -
> - pnx833x_wdt_ping();
> -
> - pr_info("Started watchdog timer\n");
> -
> - return stream_open(inode, file);
> -}
> -
> -static int pnx833x_wdt_release(struct inode *inode, struct file *file)
> -{
> - /* Shut off the timer.
> - * Lock it in if it's a module and we defined ...NOWAYOUT */
> - if (!nowayout)
> - pnx833x_wdt_stop(); /* Turn the WDT off */
> -
> - clear_bit(0, &pnx833x_wdt_alive);
> - return 0;
> -}
> -
> -static ssize_t pnx833x_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos)
> -{
> - /* Refresh the timer. */
> - if (len)
> - pnx833x_wdt_ping();
> -
> - return len;
> -}
> -
> -static long pnx833x_wdt_ioctl(struct file *file, unsigned int cmd,
> - unsigned long arg)
> -{
> - int options, new_timeout = 0;
> - uint32_t timeout, timeout_left = 0;
> -
> - static const struct watchdog_info ident = {
> - .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
> - .firmware_version = 0,
> - .identity = "Hardware Watchdog for PNX833x",
> - };
> -
> - switch (cmd) {
> - default:
> - return -ENOTTY;
> -
> - case WDIOC_GETSUPPORT:
> - if (copy_to_user((struct watchdog_info *)arg,
> - &ident, sizeof(ident)))
> - return -EFAULT;
> - return 0;
> -
> - case WDIOC_GETSTATUS:
> - case WDIOC_GETBOOTSTATUS:
> - return put_user(0, (int *)arg);
> -
> - case WDIOC_SETOPTIONS:
> - if (get_user(options, (int *)arg))
> - return -EFAULT;
> -
> - if (options & WDIOS_DISABLECARD)
> - pnx833x_wdt_stop();
> -
> - if (options & WDIOS_ENABLECARD)
> - pnx833x_wdt_start();
> -
> - return 0;
> -
> - case WDIOC_KEEPALIVE:
> - pnx833x_wdt_ping();
> - return 0;
> -
> - case WDIOC_SETTIMEOUT:
> - {
> - if (get_user(new_timeout, (int *)arg))
> - return -EFAULT;
> -
> - pnx833x_wdt_timeout = new_timeout;
> - PNX833X_REG(PNX833X_CONFIG +
> - PNX833X_CONFIG_CPU_WATCHDOG_COMPARE) = new_timeout;
> - return put_user(new_timeout, (int *)arg);
> - }
> -
> - case WDIOC_GETTIMEOUT:
> - timeout = PNX833X_REG(PNX833X_CONFIG +
> - PNX833X_CONFIG_CPU_WATCHDOG_COMPARE);
> - return put_user(timeout, (int *)arg);
> -
> - case WDIOC_GETTIMELEFT:
> - timeout_left = PNX833X_REG(PNX833X_CONFIG +
> - PNX833X_CONFIG_CPU_WATCHDOG);
> - return put_user(timeout_left, (int *)arg);
> -
> - }
> -}
> -
> -static int pnx833x_wdt_notify_sys(struct notifier_block *this,
> - unsigned long code, void *unused)
> -{
> - if (code == SYS_DOWN || code == SYS_HALT)
> - pnx833x_wdt_stop(); /* Turn the WDT off */
> -
> - return NOTIFY_DONE;
> -}
> -
> -static const struct file_operations pnx833x_wdt_fops = {
> - .owner = THIS_MODULE,
> - .llseek = no_llseek,
> - .write = pnx833x_wdt_write,
> - .unlocked_ioctl = pnx833x_wdt_ioctl,
> - .compat_ioctl = compat_ptr_ioctl,
> - .open = pnx833x_wdt_open,
> - .release = pnx833x_wdt_release,
> -};
> -
> -static struct miscdevice pnx833x_wdt_miscdev = {
> - .minor = WATCHDOG_MINOR,
> - .name = "watchdog",
> - .fops = &pnx833x_wdt_fops,
> -};
> -
> -static struct notifier_block pnx833x_wdt_notifier = {
> - .notifier_call = pnx833x_wdt_notify_sys,
> -};
> -
> -static int __init watchdog_init(void)
> -{
> - int ret, cause;
> -
> - /* Lets check the reason for the reset.*/
> - cause = PNX833X_REG(PNX833X_RESET);
> - /*If bit 31 is set then watchdog was cause of reset.*/
> - if (cause & 0x80000000) {
> - pr_info("The system was previously reset due to the watchdog firing - please investigate...\n");
> - }
> -
> - ret = register_reboot_notifier(&pnx833x_wdt_notifier);
> - if (ret) {
> - pr_err("cannot register reboot notifier (err=%d)\n", ret);
> - return ret;
> - }
> -
> - ret = misc_register(&pnx833x_wdt_miscdev);
> - if (ret) {
> - pr_err("cannot register miscdev on minor=%d (err=%d)\n",
> - WATCHDOG_MINOR, ret);
> - unregister_reboot_notifier(&pnx833x_wdt_notifier);
> - return ret;
> - }
> -
> - pr_info("Hardware Watchdog Timer for PNX833x: Version 0.1\n");
> -
> - if (start_enabled)
> - pnx833x_wdt_start();
> -
> - return 0;
> -}
> -
> -static void __exit watchdog_exit(void)
> -{
> - misc_deregister(&pnx833x_wdt_miscdev);
> - unregister_reboot_notifier(&pnx833x_wdt_notifier);
> -}
> -
> -module_init(watchdog_init);
> -module_exit(watchdog_exit);
> -
> -MODULE_AUTHOR("Daniel Laird/Andre McCurdy");
> -MODULE_DESCRIPTION("Hardware Watchdog Device for PNX833x");
> -MODULE_LICENSE("GPL");
> --
> 2.16.4
>