diff options
Diffstat (limited to 'drivers/watchdog/ar7_wdt.c')
| -rw-r--r-- | drivers/watchdog/ar7_wdt.c | 150 |
1 files changed, 64 insertions, 86 deletions
diff --git a/drivers/watchdog/ar7_wdt.c b/drivers/watchdog/ar7_wdt.c index 55dcbfe2bb7..ae6c287a49c 100644 --- a/drivers/watchdog/ar7_wdt.c +++ b/drivers/watchdog/ar7_wdt.c @@ -23,36 +23,35 @@ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/errno.h> -#include <linux/init.h> #include <linux/miscdevice.h> +#include <linux/platform_device.h> #include <linux/watchdog.h> -#include <linux/notifier.h> -#include <linux/reboot.h> #include <linux/fs.h> #include <linux/ioport.h> #include <linux/io.h> #include <linux/uaccess.h> +#include <linux/clk.h> #include <asm/addrspace.h> -#include <asm/ar7/ar7.h> +#include <asm/mach-ar7/ar7.h> -#define DRVNAME "ar7_wdt" #define LONGNAME "TI AR7 Watchdog Timer" MODULE_AUTHOR("Nicolas Thill <nico@openwrt.org>"); MODULE_DESCRIPTION(LONGNAME); MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); static int margin = 60; module_param(margin, int, 0); MODULE_PARM_DESC(margin, "Watchdog margin in seconds"); -static int nowayout = WATCHDOG_NOWAYOUT; -module_param(nowayout, int, 0); +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)) @@ -70,30 +69,18 @@ struct ar7_wdt { }; static unsigned long wdt_is_open; -static spinlock_t wdt_lock; static unsigned expect_close; +static DEFINE_SPINLOCK(wdt_lock); /* XXX currently fixed, allows max margin ~68.72 secs */ #define prescale_value 0xffff -/* Offset of the WDT registers */ -static unsigned long ar7_regs_wdt; +/* Resource of the WDT registers */ +static struct resource *ar7_regs_wdt; /* Pointer to the remapped WDT IO space */ static struct ar7_wdt *ar7_wdt; -static void ar7_wdt_get_regs(void) -{ - u16 chip_id = ar7_chip_id(); - switch (chip_id) { - case AR7_CHIP_7100: - case AR7_CHIP_7200: - ar7_regs_wdt = AR7_REGS_WDT; - break; - default: - ar7_regs_wdt = UR8_REGS_WDT; - break; - } -} +static struct clk *vbus_clk; static void ar7_wdt_kick(u32 value) { @@ -105,7 +92,7 @@ static void ar7_wdt_kick(u32 value) return; } } - printk(KERN_ERR DRVNAME ": failed to unlock WDT kick reg\n"); + pr_err("failed to unlock WDT kick reg\n"); } static void ar7_wdt_prescale(u32 value) @@ -118,7 +105,7 @@ static void ar7_wdt_prescale(u32 value) return; } } - printk(KERN_ERR DRVNAME ": failed to unlock WDT prescale reg\n"); + pr_err("failed to unlock WDT prescale reg\n"); } static void ar7_wdt_change(u32 value) @@ -131,7 +118,7 @@ static void ar7_wdt_change(u32 value) return; } } - printk(KERN_ERR DRVNAME ": failed to unlock WDT change reg\n"); + pr_err("failed to unlock WDT change reg\n"); } static void ar7_wdt_disable(u32 value) @@ -147,35 +134,36 @@ static void ar7_wdt_disable(u32 value) } } } - printk(KERN_ERR DRVNAME ": failed to unlock WDT disable reg\n"); + pr_err("failed to unlock WDT disable reg\n"); } static void ar7_wdt_update_margin(int new_margin) { u32 change; + u32 vbus_rate; - change = new_margin * (ar7_vbus_freq() / prescale_value); + 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 / ar7_vbus_freq(); - printk(KERN_INFO DRVNAME - ": timer margin %d seconds (prescale %d, change %d, freq %d)\n", - margin, prescale_value, change, ar7_vbus_freq()); + 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) { - printk(KERN_DEBUG DRVNAME ": enabling watchdog timer\n"); + pr_debug("enabling watchdog timer\n"); ar7_wdt_disable(1); ar7_wdt_kick(1); } static void ar7_wdt_disable_wdt(void) { - printk(KERN_DEBUG DRVNAME ": disabling watchdog timer\n"); + pr_debug("disabling watchdog timer\n"); ar7_wdt_disable(0); } @@ -193,29 +181,13 @@ static int ar7_wdt_open(struct inode *inode, struct file *file) static int ar7_wdt_release(struct inode *inode, struct file *file) { if (!expect_close) - printk(KERN_WARNING DRVNAME - ": watchdog device closed unexpectedly," - "will not disable the watchdog timer\n"); + 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 int ar7_wdt_notify_sys(struct notifier_block *this, - unsigned long code, void *unused) -{ - if (code == SYS_HALT || code == SYS_POWER_OFF) - if (!nowayout) - ar7_wdt_disable_wdt(); - - return NOTIFY_DONE; -} - -static struct notifier_block ar7_wdt_notifier = { - .notifier_call = ar7_wdt_notify_sys, -}; - static ssize_t ar7_wdt_write(struct file *file, const char *data, size_t len, loff_t *ppos) { @@ -243,10 +215,11 @@ static ssize_t ar7_wdt_write(struct file *file, const char *data, static long ar7_wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { - static struct watchdog_info ident = { + static const struct watchdog_info ident = { .identity = LONGNAME, .firmware_version = 1, - .options = (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING), + .options = (WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | + WDIOF_MAGICCLOSE), }; int new_margin; @@ -290,6 +263,7 @@ static const struct file_operations ar7_wdt_fops = { .unlocked_ioctl = ar7_wdt_ioctl, .open = ar7_wdt_open, .release = ar7_wdt_release, + .llseek = no_llseek, }; static struct miscdevice ar7_wdt_miscdev = { @@ -298,57 +272,61 @@ static struct miscdevice ar7_wdt_miscdev = { .fops = &ar7_wdt_fops, }; -static int __init ar7_wdt_init(void) +static int ar7_wdt_probe(struct platform_device *pdev) { int rc; - spin_lock_init(&wdt_lock); - - ar7_wdt_get_regs(); + ar7_regs_wdt = + platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs"); + ar7_wdt = devm_ioremap_resource(&pdev->dev, ar7_regs_wdt); + if (IS_ERR(ar7_wdt)) + return PTR_ERR(ar7_wdt); - if (!request_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt), - LONGNAME)) { - printk(KERN_WARNING DRVNAME ": watchdog I/O region busy\n"); - return -EBUSY; + 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 = (struct ar7_wdt *) - ioremap(ar7_regs_wdt, sizeof(struct ar7_wdt)); - ar7_wdt_disable_wdt(); ar7_wdt_prescale(prescale_value); ar7_wdt_update_margin(margin); - rc = register_reboot_notifier(&ar7_wdt_notifier); - if (rc) { - printk(KERN_ERR DRVNAME - ": unable to register reboot notifier\n"); - goto out_alloc; - } - rc = misc_register(&ar7_wdt_miscdev); if (rc) { - printk(KERN_ERR DRVNAME ": unable to register misc device\n"); - goto out_register; + pr_err("unable to register misc device\n"); + goto out; } - goto out; + return 0; -out_register: - unregister_reboot_notifier(&ar7_wdt_notifier); -out_alloc: - iounmap(ar7_wdt); - release_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt)); out: + clk_put(vbus_clk); + vbus_clk = NULL; return rc; } -static void __exit ar7_wdt_cleanup(void) +static int ar7_wdt_remove(struct platform_device *pdev) { misc_deregister(&ar7_wdt_miscdev); - unregister_reboot_notifier(&ar7_wdt_notifier); - iounmap(ar7_wdt); - release_mem_region(ar7_regs_wdt, sizeof(struct ar7_wdt)); + clk_put(vbus_clk); + vbus_clk = NULL; + return 0; } -module_init(ar7_wdt_init); -module_exit(ar7_wdt_cleanup); +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 = ar7_wdt_remove, + .shutdown = ar7_wdt_shutdown, + .driver = { + .owner = THIS_MODULE, + .name = "ar7_wdt", + }, +}; + +module_platform_driver(ar7_wdt_driver); |