watchdog: remove w90x900 driver

The ARM w90x900 platform is getting removed, so this driver is obsolete
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20190809202749.742267-7-arnd@arndb.deSigned-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Documentation/watchdog/watchdog-parameters.rst

@@ -366,16 +366,6 @@ nic7018_wdt:
 
 -------------------------------------------------
 
-nuc900_wdt:
-    heartbeat:
-	Watchdog heartbeats in seconds.
-	(default = 15)
-    nowayout:
-	Watchdog cannot be stopped once started
-	(default=kernel config parameter)
-
--------------------------------------------------
-
 omap_wdt:
     timer_margin:
 	initial watchdog timeout (in seconds)

drivers/watchdog/Kconfig

@@ -655,15 +655,6 @@ config STMP3XXX_RTC_WATCHDOG
 	  To compile this driver as a module, choose M here: the
 	  module will be called stmp3xxx_rtc_wdt.
 
-config NUC900_WATCHDOG
-	tristate "Nuvoton NUC900 watchdog"
-	depends on ARCH_W90X900 || COMPILE_TEST
-	help
-	  Say Y here if to include support for the watchdog timer
-	  for the Nuvoton NUC900 series SoCs.
-	  To compile this driver as a module, choose M here: the
-	  module will be called nuc900_wdt.
-
 config TS4800_WATCHDOG
 	tristate "TS-4800 Watchdog"
 	depends on HAS_IOMEM && OF

drivers/watchdog/Makefile

@@ -63,7 +63,6 @@ obj-$(CONFIG_RN5T618_WATCHDOG) += rn5t618_wdt.o
 obj-$(CONFIG_COH901327_WATCHDOG) += coh901327_wdt.o
 obj-$(CONFIG_NPCM7XX_WATCHDOG) += npcm_wdt.o
 obj-$(CONFIG_STMP3XXX_RTC_WATCHDOG) += stmp3xxx_rtc_wdt.o
-obj-$(CONFIG_NUC900_WATCHDOG) += nuc900_wdt.o
 obj-$(CONFIG_TS4800_WATCHDOG) += ts4800_wdt.o
 obj-$(CONFIG_TS72XX_WATCHDOG) += ts72xx_wdt.o
 obj-$(CONFIG_IMX2_WDT) += imx2_wdt.o

drivers/watchdog/nuc900_wdt.c

-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (c) 2009 Nuvoton technology corporation.
- *
- * Wan ZongShun <mcuos.com@gmail.com>
- */
-
-#include <linux/bitops.h>
-#include <linux/errno.h>
-#include <linux/fs.h>
-#include <linux/io.h>
-#include <linux/clk.h>
-#include <linux/kernel.h>
-#include <linux/miscdevice.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/interrupt.h>
-#include <linux/types.h>
-#include <linux/watchdog.h>
-#include <linux/uaccess.h>
-
-#define REG_WTCR		0x1c
-#define WTCLK			(0x01 << 10)
-#define WTE			(0x01 << 7)	/*wdt enable*/
-#define WTIS			(0x03 << 4)
-#define WTIF			(0x01 << 3)
-#define WTRF			(0x01 << 2)
-#define WTRE			(0x01 << 1)
-#define WTR			(0x01 << 0)
-/*
- * The watchdog time interval can be calculated via following formula:
- * WTIS		real time interval (formula)
- * 0x00		((2^ 14 ) * ((external crystal freq) / 256))seconds
- * 0x01		((2^ 16 ) * ((external crystal freq) / 256))seconds
- * 0x02		((2^ 18 ) * ((external crystal freq) / 256))seconds
- * 0x03		((2^ 20 ) * ((external crystal freq) / 256))seconds
- *
- * The external crystal freq is 15Mhz in the nuc900 evaluation board.
- * So 0x00 = +-0.28 seconds, 0x01 = +-1.12 seconds, 0x02 = +-4.48 seconds,
- * 0x03 = +- 16.92 seconds..
- */
-#define WDT_HW_TIMEOUT		0x02
-#define WDT_TIMEOUT		(HZ/2)
-#define WDT_HEARTBEAT		15
-
-static int heartbeat = WDT_HEARTBEAT;
-module_param(heartbeat, int, 0);
-MODULE_PARM_DESC(heartbeat, "Watchdog heartbeats in seconds. "
-	"(default = " __MODULE_STRING(WDT_HEARTBEAT) ")");
-
-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) ")");
-
-struct nuc900_wdt {
-	struct clk	 *wdt_clock;
-	struct platform_device *pdev;
-	void __iomem	 *wdt_base;
-	char		 expect_close;
-	struct timer_list timer;
-	spinlock_t       wdt_lock;
-	unsigned long next_heartbeat;
-};
-
-static unsigned long nuc900wdt_busy;
-static struct nuc900_wdt *nuc900_wdt;
-
-static inline void nuc900_wdt_keepalive(void)
-{
-	unsigned int val;
-
-	spin_lock(&nuc900_wdt->wdt_lock);
-
-	val = __raw_readl(nuc900_wdt->wdt_base + REG_WTCR);
-	val |= (WTR | WTIF);
-	__raw_writel(val, nuc900_wdt->wdt_base + REG_WTCR);
-
-	spin_unlock(&nuc900_wdt->wdt_lock);
-}
-
-static inline void nuc900_wdt_start(void)
-{
-	unsigned int val;
-
-	spin_lock(&nuc900_wdt->wdt_lock);
-
-	val = __raw_readl(nuc900_wdt->wdt_base + REG_WTCR);
-	val |= (WTRE | WTE | WTR | WTCLK | WTIF);
-	val &= ~WTIS;
-	val |= (WDT_HW_TIMEOUT << 0x04);
-	__raw_writel(val, nuc900_wdt->wdt_base + REG_WTCR);
-
-	spin_unlock(&nuc900_wdt->wdt_lock);
-
-	nuc900_wdt->next_heartbeat = jiffies + heartbeat * HZ;
-	mod_timer(&nuc900_wdt->timer, jiffies + WDT_TIMEOUT);
-}
-
-static inline void nuc900_wdt_stop(void)
-{
-	unsigned int val;
-
-	del_timer(&nuc900_wdt->timer);
-
-	spin_lock(&nuc900_wdt->wdt_lock);
-
-	val = __raw_readl(nuc900_wdt->wdt_base + REG_WTCR);
-	val &= ~WTE;
-	__raw_writel(val, nuc900_wdt->wdt_base + REG_WTCR);
-
-	spin_unlock(&nuc900_wdt->wdt_lock);
-}
-
-static inline void nuc900_wdt_ping(void)
-{
-	nuc900_wdt->next_heartbeat = jiffies + heartbeat * HZ;
-}
-
-static int nuc900_wdt_open(struct inode *inode, struct file *file)
-{
-
-	if (test_and_set_bit(0, &nuc900wdt_busy))
-		return -EBUSY;
-
-	nuc900_wdt_start();
-
-	return stream_open(inode, file);
-}
-
-static int nuc900_wdt_close(struct inode *inode, struct file *file)
-{
-	if (nuc900_wdt->expect_close == 42)
-		nuc900_wdt_stop();
-	else {
-		dev_crit(&nuc900_wdt->pdev->dev,
-			"Unexpected close, not stopping watchdog!\n");
-		nuc900_wdt_ping();
-	}
-
-	nuc900_wdt->expect_close = 0;
-	clear_bit(0, &nuc900wdt_busy);
-	return 0;
-}
-
-static const struct watchdog_info nuc900_wdt_info = {
-	.identity	= "nuc900 watchdog",
-	.options	= WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
-						WDIOF_MAGICCLOSE,
-};
-
-static long nuc900_wdt_ioctl(struct file *file,
-					unsigned int cmd, unsigned long arg)
-{
-	void __user *argp = (void __user *)arg;
-	int __user *p = argp;
-	int new_value;
-
-	switch (cmd) {
-	case WDIOC_GETSUPPORT:
-		return copy_to_user(argp, &nuc900_wdt_info,
-				sizeof(nuc900_wdt_info)) ? -EFAULT : 0;
-	case WDIOC_GETSTATUS:
-	case WDIOC_GETBOOTSTATUS:
-		return put_user(0, p);
-
-	case WDIOC_KEEPALIVE:
-		nuc900_wdt_ping();
-		return 0;
-
-	case WDIOC_SETTIMEOUT:
-		if (get_user(new_value, p))
-			return -EFAULT;
-
-		heartbeat = new_value;
-		nuc900_wdt_ping();
-
-		return put_user(new_value, p);
-	case WDIOC_GETTIMEOUT:
-		return put_user(heartbeat, p);
-	default:
-		return -ENOTTY;
-	}
-}
-
-static ssize_t nuc900_wdt_write(struct file *file, const char __user *data,
-						size_t len, loff_t *ppos)
-{
-	if (!len)
-		return 0;
-
-	/* Scan for magic character */
-	if (!nowayout) {
-		size_t i;
-
-		nuc900_wdt->expect_close = 0;
-
-		for (i = 0; i < len; i++) {
-			char c;
-			if (get_user(c, data + i))
-				return -EFAULT;
-			if (c == 'V') {
-				nuc900_wdt->expect_close = 42;
-				break;
-			}
-		}
-	}
-
-	nuc900_wdt_ping();
-	return len;
-}
-
-static void nuc900_wdt_timer_ping(struct timer_list *unused)
-{
-	if (time_before(jiffies, nuc900_wdt->next_heartbeat)) {
-		nuc900_wdt_keepalive();
-		mod_timer(&nuc900_wdt->timer, jiffies + WDT_TIMEOUT);
-	} else
-		dev_warn(&nuc900_wdt->pdev->dev, "Will reset the machine !\n");
-}
-
-static const struct file_operations nuc900wdt_fops = {
-	.owner		= THIS_MODULE,
-	.llseek		= no_llseek,
-	.unlocked_ioctl	= nuc900_wdt_ioctl,
-	.open		= nuc900_wdt_open,
-	.release	= nuc900_wdt_close,
-	.write		= nuc900_wdt_write,
-};
-
-static struct miscdevice nuc900wdt_miscdev = {
-	.minor		= WATCHDOG_MINOR,
-	.name		= "watchdog",
-	.fops		= &nuc900wdt_fops,
-};
-
-static int nuc900wdt_probe(struct platform_device *pdev)
-{
-	int ret = 0;
-
-	nuc900_wdt = devm_kzalloc(&pdev->dev, sizeof(*nuc900_wdt),
-				GFP_KERNEL);
-	if (!nuc900_wdt)
-		return -ENOMEM;
-
-	nuc900_wdt->pdev = pdev;
-
-	spin_lock_init(&nuc900_wdt->wdt_lock);
-
-	nuc900_wdt->wdt_base = devm_platform_ioremap_resource(pdev, 0);
-	if (IS_ERR(nuc900_wdt->wdt_base))
-		return PTR_ERR(nuc900_wdt->wdt_base);
-
-	nuc900_wdt->wdt_clock = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(nuc900_wdt->wdt_clock)) {
-		dev_err(&pdev->dev, "failed to find watchdog clock source\n");
-		return PTR_ERR(nuc900_wdt->wdt_clock);
-	}
-
-	clk_enable(nuc900_wdt->wdt_clock);
-
-	timer_setup(&nuc900_wdt->timer, nuc900_wdt_timer_ping, 0);
-
-	ret = misc_register(&nuc900wdt_miscdev);
-	if (ret) {
-		dev_err(&pdev->dev, "err register miscdev on minor=%d (%d)\n",
-			WATCHDOG_MINOR, ret);
-		goto err_clk;
-	}
-
-	return 0;
-
-err_clk:
-	clk_disable(nuc900_wdt->wdt_clock);
-	return ret;
-}
-
-static int nuc900wdt_remove(struct platform_device *pdev)
-{
-	misc_deregister(&nuc900wdt_miscdev);
-
-	clk_disable(nuc900_wdt->wdt_clock);
-
-	return 0;
-}
-
-static struct platform_driver nuc900wdt_driver = {
-	.probe		= nuc900wdt_probe,
-	.remove		= nuc900wdt_remove,
-	.driver		= {
-		.name	= "nuc900-wdt",
-	},
-};
-
-module_platform_driver(nuc900wdt_driver);
-
-MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
-MODULE_DESCRIPTION("Watchdog driver for NUC900");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:nuc900-wdt");