From dc50eab76b709d68175a358d6e23a5a3890764d3 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 18 May 2024 19:39:57 +0200 Subject: Merging upstream version 6.7.7. Signed-off-by: Daniel Baumann --- drivers/watchdog/ar7_wdt.c | 315 --------------------------------------------- 1 file changed, 315 deletions(-) delete mode 100644 drivers/watchdog/ar7_wdt.c (limited to 'drivers/watchdog/ar7_wdt.c') diff --git a/drivers/watchdog/ar7_wdt.c b/drivers/watchdog/ar7_wdt.c deleted file mode 100644 index cdcaeb0961..0000000000 --- a/drivers/watchdog/ar7_wdt.c +++ /dev/null @@ -1,315 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * drivers/watchdog/ar7_wdt.c - * - * Copyright (C) 2007 Nicolas Thill - * Copyright (c) 2005 Enrik Berkhan - * - * Some code taken from: - * National Semiconductor SCx200 Watchdog support - * Copyright (c) 2001,2002 Christer Weinigel - * - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include - -#define LONGNAME "TI AR7 Watchdog Timer" - -MODULE_AUTHOR("Nicolas Thill "); -MODULE_DESCRIPTION(LONGNAME); -MODULE_LICENSE("GPL"); - -static int margin = 60; -module_param(margin, int, 0); -MODULE_PARM_DESC(margin, "Watchdog margin in seconds"); - -static bool nowayout = WATCHDOG_NOWAYOUT; -module_param(nowayout, bool, 0); -MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close"); - -#define READ_REG(x) readl((void __iomem *)&(x)) -#define WRITE_REG(x, v) writel((v), (void __iomem *)&(x)) - -struct ar7_wdt { - u32 kick_lock; - u32 kick; - u32 change_lock; - u32 change; - u32 disable_lock; - u32 disable; - u32 prescale_lock; - u32 prescale; -}; - -static unsigned long wdt_is_open; -static unsigned expect_close; -static DEFINE_SPINLOCK(wdt_lock); - -/* XXX currently fixed, allows max margin ~68.72 secs */ -#define prescale_value 0xffff - -/* Pointer to the remapped WDT IO space */ -static struct ar7_wdt *ar7_wdt; - -static struct clk *vbus_clk; - -static void ar7_wdt_kick(u32 value) -{ - WRITE_REG(ar7_wdt->kick_lock, 0x5555); - if ((READ_REG(ar7_wdt->kick_lock) & 3) == 1) { - WRITE_REG(ar7_wdt->kick_lock, 0xaaaa); - if ((READ_REG(ar7_wdt->kick_lock) & 3) == 3) { - WRITE_REG(ar7_wdt->kick, value); - return; - } - } - pr_err("failed to unlock WDT kick reg\n"); -} - -static void ar7_wdt_prescale(u32 value) -{ - WRITE_REG(ar7_wdt->prescale_lock, 0x5a5a); - if ((READ_REG(ar7_wdt->prescale_lock) & 3) == 1) { - WRITE_REG(ar7_wdt->prescale_lock, 0xa5a5); - if ((READ_REG(ar7_wdt->prescale_lock) & 3) == 3) { - WRITE_REG(ar7_wdt->prescale, value); - return; - } - } - pr_err("failed to unlock WDT prescale reg\n"); -} - -static void ar7_wdt_change(u32 value) -{ - WRITE_REG(ar7_wdt->change_lock, 0x6666); - if ((READ_REG(ar7_wdt->change_lock) & 3) == 1) { - WRITE_REG(ar7_wdt->change_lock, 0xbbbb); - if ((READ_REG(ar7_wdt->change_lock) & 3) == 3) { - WRITE_REG(ar7_wdt->change, value); - return; - } - } - pr_err("failed to unlock WDT change reg\n"); -} - -static void ar7_wdt_disable(u32 value) -{ - WRITE_REG(ar7_wdt->disable_lock, 0x7777); - if ((READ_REG(ar7_wdt->disable_lock) & 3) == 1) { - WRITE_REG(ar7_wdt->disable_lock, 0xcccc); - if ((READ_REG(ar7_wdt->disable_lock) & 3) == 2) { - WRITE_REG(ar7_wdt->disable_lock, 0xdddd); - if ((READ_REG(ar7_wdt->disable_lock) & 3) == 3) { - WRITE_REG(ar7_wdt->disable, value); - return; - } - } - } - pr_err("failed to unlock WDT disable reg\n"); -} - -static void ar7_wdt_update_margin(int new_margin) -{ - u32 change; - u32 vbus_rate; - - vbus_rate = clk_get_rate(vbus_clk); - change = new_margin * (vbus_rate / prescale_value); - if (change < 1) - change = 1; - if (change > 0xffff) - change = 0xffff; - ar7_wdt_change(change); - margin = change * prescale_value / vbus_rate; - pr_info("timer margin %d seconds (prescale %d, change %d, freq %d)\n", - margin, prescale_value, change, vbus_rate); -} - -static void ar7_wdt_enable_wdt(void) -{ - pr_debug("enabling watchdog timer\n"); - ar7_wdt_disable(1); - ar7_wdt_kick(1); -} - -static void ar7_wdt_disable_wdt(void) -{ - pr_debug("disabling watchdog timer\n"); - ar7_wdt_disable(0); -} - -static int ar7_wdt_open(struct inode *inode, struct file *file) -{ - /* only allow one at a time */ - if (test_and_set_bit(0, &wdt_is_open)) - return -EBUSY; - ar7_wdt_enable_wdt(); - expect_close = 0; - - return stream_open(inode, file); -} - -static int ar7_wdt_release(struct inode *inode, struct file *file) -{ - if (!expect_close) - pr_warn("watchdog device closed unexpectedly, will not disable the watchdog timer\n"); - else if (!nowayout) - ar7_wdt_disable_wdt(); - clear_bit(0, &wdt_is_open); - return 0; -} - -static ssize_t ar7_wdt_write(struct file *file, const char *data, - size_t len, loff_t *ppos) -{ - /* check for a magic close character */ - if (len) { - size_t i; - - spin_lock(&wdt_lock); - ar7_wdt_kick(1); - spin_unlock(&wdt_lock); - - expect_close = 0; - for (i = 0; i < len; ++i) { - char c; - if (get_user(c, data + i)) - return -EFAULT; - if (c == 'V') - expect_close = 1; - } - - } - return len; -} - -static long ar7_wdt_ioctl(struct file *file, - unsigned int cmd, unsigned long arg) -{ - static const struct watchdog_info ident = { - .identity = LONGNAME, - .firmware_version = 1, - .options = (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | - WDIOF_MAGICCLOSE), - }; - int new_margin; - - switch (cmd) { - case WDIOC_GETSUPPORT: - if (copy_to_user((struct watchdog_info *)arg, &ident, - sizeof(ident))) - return -EFAULT; - return 0; - case WDIOC_GETSTATUS: - case WDIOC_GETBOOTSTATUS: - if (put_user(0, (int *)arg)) - return -EFAULT; - return 0; - case WDIOC_KEEPALIVE: - ar7_wdt_kick(1); - return 0; - case WDIOC_SETTIMEOUT: - if (get_user(new_margin, (int *)arg)) - return -EFAULT; - if (new_margin < 1) - return -EINVAL; - - spin_lock(&wdt_lock); - ar7_wdt_update_margin(new_margin); - ar7_wdt_kick(1); - spin_unlock(&wdt_lock); - fallthrough; - case WDIOC_GETTIMEOUT: - if (put_user(margin, (int *)arg)) - return -EFAULT; - return 0; - default: - return -ENOTTY; - } -} - -static const struct file_operations ar7_wdt_fops = { - .owner = THIS_MODULE, - .write = ar7_wdt_write, - .unlocked_ioctl = ar7_wdt_ioctl, - .compat_ioctl = compat_ptr_ioctl, - .open = ar7_wdt_open, - .release = ar7_wdt_release, - .llseek = no_llseek, -}; - -static struct miscdevice ar7_wdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &ar7_wdt_fops, -}; - -static int ar7_wdt_probe(struct platform_device *pdev) -{ - int rc; - - ar7_wdt = devm_platform_ioremap_resource_byname(pdev, "regs"); - if (IS_ERR(ar7_wdt)) - return PTR_ERR(ar7_wdt); - - vbus_clk = clk_get(NULL, "vbus"); - if (IS_ERR(vbus_clk)) { - pr_err("could not get vbus clock\n"); - return PTR_ERR(vbus_clk); - } - - ar7_wdt_disable_wdt(); - ar7_wdt_prescale(prescale_value); - ar7_wdt_update_margin(margin); - - rc = misc_register(&ar7_wdt_miscdev); - if (rc) { - pr_err("unable to register misc device\n"); - goto out; - } - return 0; - -out: - clk_put(vbus_clk); - vbus_clk = NULL; - return rc; -} - -static void ar7_wdt_remove(struct platform_device *pdev) -{ - misc_deregister(&ar7_wdt_miscdev); - clk_put(vbus_clk); - vbus_clk = NULL; -} - -static void ar7_wdt_shutdown(struct platform_device *pdev) -{ - if (!nowayout) - ar7_wdt_disable_wdt(); -} - -static struct platform_driver ar7_wdt_driver = { - .probe = ar7_wdt_probe, - .remove_new = ar7_wdt_remove, - .shutdown = ar7_wdt_shutdown, - .driver = { - .name = "ar7_wdt", - }, -}; - -module_platform_driver(ar7_wdt_driver); -- cgit v1.2.3