| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Wim Van Sebroeck | 1219 | 90.97% | 9 | 34.62% |
| Al Viro | 25 | 1.87% | 1 | 3.85% |
| Jiri Slaby | 20 | 1.49% | 1 | 3.85% |
| Alan Cox | 19 | 1.42% | 2 | 7.69% |
| Joe Perches | 16 | 1.19% | 1 | 3.85% |
| Andrey Borzenkov | 15 | 1.12% | 1 | 3.85% |
| Jingoo Han | 7 | 0.52% | 1 | 3.85% |
| Arnd Bergmann | 5 | 0.37% | 1 | 3.85% |
| Alexey Dobriyan | 4 | 0.30% | 1 | 3.85% |
| Gustavo A. R. Silva | 2 | 0.15% | 1 | 3.85% |
| Thomas Gleixner | 2 | 0.15% | 1 | 3.85% |
| Kirill Smelkov | 1 | 0.07% | 1 | 3.85% |
| Samuel Tardieu | 1 | 0.07% | 1 | 3.85% |
| Namhyung Kim | 1 | 0.07% | 1 | 3.85% |
| Rolf Eike Beer | 1 | 0.07% | 1 | 3.85% |
| Andrey Panin | 1 | 0.07% | 1 | 3.85% |
| Arjan van de Ven | 1 | 0.07% | 1 | 3.85% |
| Total | 1340 | 26 |
// SPDX-License-Identifier: GPL-2.0-or-later /* * Watchdog for the 7101 PMU version found in the ALi M1535 chipsets */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/types.h> #include <linux/miscdevice.h> #include <linux/watchdog.h> #include <linux/ioport.h> #include <linux/notifier.h> #include <linux/reboot.h> #include <linux/init.h> #include <linux/fs.h> #include <linux/pci.h> #include <linux/uaccess.h> #include <linux/io.h> #define WATCHDOG_NAME "ALi_M1535" #define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */ /* internal variables */ static unsigned long ali_is_open; static char ali_expect_release; static struct pci_dev *ali_pci; static u32 ali_timeout_bits; /* stores the computed timeout */ static DEFINE_SPINLOCK(ali_lock); /* Guards the hardware */ /* module parameters */ static int timeout = WATCHDOG_TIMEOUT; module_param(timeout, int, 0); MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (0 < timeout < 18000, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); 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) ")"); /* * ali_start - start watchdog countdown * * Starts the timer running providing the timer has a counter * configuration set. */ static void ali_start(void) { u32 val; spin_lock(&ali_lock); pci_read_config_dword(ali_pci, 0xCC, &val); val &= ~0x3F; /* Mask count */ val |= (1 << 25) | ali_timeout_bits; pci_write_config_dword(ali_pci, 0xCC, val); spin_unlock(&ali_lock); } /* * ali_stop - stop the timer countdown * * Stop the ALi watchdog countdown */ static void ali_stop(void) { u32 val; spin_lock(&ali_lock); pci_read_config_dword(ali_pci, 0xCC, &val); val &= ~0x3F; /* Mask count to zero (disabled) */ val &= ~(1 << 25); /* and for safety mask the reset enable */ pci_write_config_dword(ali_pci, 0xCC, val); spin_unlock(&ali_lock); } /* * ali_keepalive - send a keepalive to the watchdog * * Send a keepalive to the timer (actually we restart the timer). */ static void ali_keepalive(void) { ali_start(); } /* * ali_settimer - compute the timer reload value * @t: time in seconds * * Computes the timeout values needed */ static int ali_settimer(int t) { if (t < 0) return -EINVAL; else if (t < 60) ali_timeout_bits = t|(1 << 6); else if (t < 3600) ali_timeout_bits = (t / 60)|(1 << 7); else if (t < 18000) ali_timeout_bits = (t / 300)|(1 << 6)|(1 << 7); else return -EINVAL; timeout = t; return 0; } /* * /dev/watchdog handling */ /* * ali_write - writes to ALi watchdog * @file: file from VFS * @data: user address of data * @len: length of data * @ppos: pointer to the file offset * * Handle a write to the ALi watchdog. Writing to the file pings * the watchdog and resets it. Writing the magic 'V' sequence allows * the next close to turn off the watchdog. */ static ssize_t ali_write(struct file *file, const char __user *data, size_t len, loff_t *ppos) { /* See if we got the magic character 'V' and reload the timer */ if (len) { if (!nowayout) { size_t i; /* note: just in case someone wrote the magic character five months ago... */ ali_expect_release = 0; /* scan to see whether or not we got the magic character */ for (i = 0; i != len; i++) { char c; if (get_user(c, data + i)) return -EFAULT; if (c == 'V') ali_expect_release = 42; } } /* someone wrote to us, we should reload the timer */ ali_start(); } return len; } /* * ali_ioctl - handle watchdog ioctls * @file: VFS file pointer * @cmd: ioctl number * @arg: arguments to the ioctl * * Handle the watchdog ioctls supported by the ALi driver. Really * we want an extension to enable irq ack monitoring and the like */ static long ali_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { void __user *argp = (void __user *)arg; int __user *p = argp; static const struct watchdog_info ident = { .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE, .firmware_version = 0, .identity = "ALi M1535 WatchDog Timer", }; 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_SETOPTIONS: { int new_options, retval = -EINVAL; if (get_user(new_options, p)) return -EFAULT; if (new_options & WDIOS_DISABLECARD) { ali_stop(); retval = 0; } if (new_options & WDIOS_ENABLECARD) { ali_start(); retval = 0; } return retval; } case WDIOC_KEEPALIVE: ali_keepalive(); return 0; case WDIOC_SETTIMEOUT: { int new_timeout; if (get_user(new_timeout, p)) return -EFAULT; if (ali_settimer(new_timeout)) return -EINVAL; ali_keepalive(); } fallthrough; case WDIOC_GETTIMEOUT: return put_user(timeout, p); default: return -ENOTTY; } } /* * ali_open - handle open of ali watchdog * @inode: inode from VFS * @file: file from VFS * * Open the ALi watchdog device. Ensure only one person opens it * at a time. Also start the watchdog running. */ static int ali_open(struct inode *inode, struct file *file) { /* /dev/watchdog can only be opened once */ if (test_and_set_bit(0, &ali_is_open)) return -EBUSY; /* Activate */ ali_start(); return stream_open(inode, file); } /* * ali_release - close an ALi watchdog * @inode: inode from VFS * @file: file from VFS * * Close the ALi watchdog device. Actual shutdown of the timer * only occurs if the magic sequence has been set. */ static int ali_release(struct inode *inode, struct file *file) { /* * Shut off the timer. */ if (ali_expect_release == 42) ali_stop(); else { pr_crit("Unexpected close, not stopping watchdog!\n"); ali_keepalive(); } clear_bit(0, &ali_is_open); ali_expect_release = 0; return 0; } /* * ali_notify_sys - System down notifier * * Notifier for system down */ static int ali_notify_sys(struct notifier_block *this, unsigned long code, void *unused) { if (code == SYS_DOWN || code == SYS_HALT) ali_stop(); /* Turn the WDT off */ return NOTIFY_DONE; } /* * Data for PCI driver interface * * This data only exists for exporting the supported * PCI ids via MODULE_DEVICE_TABLE. We do not actually * register a pci_driver, because someone else might one day * want to register another driver on the same PCI id. */ static const struct pci_device_id ali_pci_tbl[] __used = { { PCI_VENDOR_ID_AL, 0x1533, PCI_ANY_ID, PCI_ANY_ID,}, { PCI_VENDOR_ID_AL, 0x1535, PCI_ANY_ID, PCI_ANY_ID,}, { 0, }, }; MODULE_DEVICE_TABLE(pci, ali_pci_tbl); /* * ali_find_watchdog - find a 1535 and 7101 * * Scans the PCI hardware for a 1535 series bridge and matching 7101 * watchdog device. This may be overtight but it is better to be safe */ static int __init ali_find_watchdog(void) { struct pci_dev *pdev; u32 wdog; /* Check for a 1533/1535 series bridge */ pdev = pci_get_device(PCI_VENDOR_ID_AL, 0x1535, NULL); if (pdev == NULL) pdev = pci_get_device(PCI_VENDOR_ID_AL, 0x1533, NULL); if (pdev == NULL) return -ENODEV; pci_dev_put(pdev); /* Check for the a 7101 PMU */ pdev = pci_get_device(PCI_VENDOR_ID_AL, 0x7101, NULL); if (pdev == NULL) return -ENODEV; if (pci_enable_device(pdev)) { pci_dev_put(pdev); return -EIO; } ali_pci = pdev; /* * Initialize the timer bits */ pci_read_config_dword(pdev, 0xCC, &wdog); /* Timer bits */ wdog &= ~0x3F; /* Issued events */ wdog &= ~((1 << 27)|(1 << 26)|(1 << 25)|(1 << 24)); /* No monitor bits */ wdog &= ~((1 << 16)|(1 << 13)|(1 << 12)|(1 << 11)|(1 << 10)|(1 << 9)); pci_write_config_dword(pdev, 0xCC, wdog); return 0; } /* * Kernel Interfaces */ static const struct file_operations ali_fops = { .owner = THIS_MODULE, .write = ali_write, .unlocked_ioctl = ali_ioctl, .compat_ioctl = compat_ptr_ioctl, .open = ali_open, .release = ali_release, }; static struct miscdevice ali_miscdev = { .minor = WATCHDOG_MINOR, .name = "watchdog", .fops = &ali_fops, }; static struct notifier_block ali_notifier = { .notifier_call = ali_notify_sys, }; /* * watchdog_init - module initialiser * * Scan for a suitable watchdog and if so initialize it. Return an error * if we cannot, the error causes the module to unload */ static int __init watchdog_init(void) { int ret; /* Check whether or not the hardware watchdog is there */ if (ali_find_watchdog() != 0) return -ENODEV; /* Check that the timeout value is within it's range; if not reset to the default */ if (timeout < 1 || timeout >= 18000) { timeout = WATCHDOG_TIMEOUT; pr_info("timeout value must be 0 < timeout < 18000, using %d\n", timeout); } /* Calculate the watchdog's timeout */ ali_settimer(timeout); ret = register_reboot_notifier(&ali_notifier); if (ret != 0) { pr_err("cannot register reboot notifier (err=%d)\n", ret); goto out; } ret = misc_register(&ali_miscdev); if (ret != 0) { pr_err("cannot register miscdev on minor=%d (err=%d)\n", WATCHDOG_MINOR, ret); goto unreg_reboot; } pr_info("initialized. timeout=%d sec (nowayout=%d)\n", timeout, nowayout); out: return ret; unreg_reboot: unregister_reboot_notifier(&ali_notifier); goto out; } /* * watchdog_exit - module de-initialiser * * Called while unloading a successfully installed watchdog module. */ static void __exit watchdog_exit(void) { /* Stop the timer before we leave */ ali_stop(); /* Deregister */ misc_deregister(&ali_miscdev); unregister_reboot_notifier(&ali_notifier); pci_dev_put(ali_pci); } module_init(watchdog_init); module_exit(watchdog_exit); MODULE_AUTHOR("Alan Cox"); MODULE_DESCRIPTION("ALi M1535 PMU Watchdog Timer driver"); MODULE_LICENSE("GPL");