| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Copyright (C) 2016 National Instruments Corp. |
| */ |
| |
| #include <linux/acpi.h> |
| #include <linux/device.h> |
| #include <linux/interrupt.h> |
| #include <linux/io.h> |
| #include <linux/module.h> |
| #include <linux/watchdog.h> |
| |
| #define NIWD_CONTROL 0x01 |
| #define NIWD_COUNTER2 0x02 |
| #define NIWD_COUNTER1 0x03 |
| #define NIWD_COUNTER0 0x04 |
| #define NIWD_SEED2 0x05 |
| #define NIWD_SEED1 0x06 |
| #define NIWD_SEED0 0x07 |
| |
| #define NIWD_IO_SIZE 0x08 |
| |
| #define NIWD_CONTROL_MODE 0x80 |
| #define NIWD_CONTROL_PROC_RESET 0x20 |
| #define NIWD_CONTROL_PET 0x10 |
| #define NIWD_CONTROL_RUNNING 0x08 |
| #define NIWD_CONTROL_CAPTURECOUNTER 0x04 |
| #define NIWD_CONTROL_RESET 0x02 |
| #define NIWD_CONTROL_ALARM 0x01 |
| |
| #define NIWD_PERIOD_NS 30720 |
| #define NIWD_MIN_TIMEOUT 1 |
| #define NIWD_MAX_TIMEOUT 515 |
| #define NIWD_DEFAULT_TIMEOUT 60 |
| |
| #define NIWD_NAME "ni903x_wdt" |
| |
| struct ni903x_wdt { |
| struct device *dev; |
| u16 io_base; |
| struct watchdog_device wdd; |
| }; |
| |
| static unsigned int timeout; |
| module_param(timeout, uint, 0); |
| MODULE_PARM_DESC(timeout, |
| "Watchdog timeout in seconds. (default=" |
| __MODULE_STRING(NIWD_DEFAULT_TIMEOUT) ")"); |
| |
| static int nowayout = WATCHDOG_NOWAYOUT; |
| module_param(nowayout, int, S_IRUGO); |
| MODULE_PARM_DESC(nowayout, |
| "Watchdog cannot be stopped once started (default=" |
| __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
| |
| static void ni903x_start(struct ni903x_wdt *wdt) |
| { |
| u8 control = inb(wdt->io_base + NIWD_CONTROL); |
| |
| outb(control | NIWD_CONTROL_RESET, wdt->io_base + NIWD_CONTROL); |
| outb(control | NIWD_CONTROL_PET, wdt->io_base + NIWD_CONTROL); |
| } |
| |
| static int ni903x_wdd_set_timeout(struct watchdog_device *wdd, |
| unsigned int timeout) |
| { |
| struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd); |
| u32 counter = timeout * (1000000000 / NIWD_PERIOD_NS); |
| |
| outb(((0x00FF0000 & counter) >> 16), wdt->io_base + NIWD_SEED2); |
| outb(((0x0000FF00 & counter) >> 8), wdt->io_base + NIWD_SEED1); |
| outb((0x000000FF & counter), wdt->io_base + NIWD_SEED0); |
| |
| wdd->timeout = timeout; |
| |
| return 0; |
| } |
| |
| static unsigned int ni903x_wdd_get_timeleft(struct watchdog_device *wdd) |
| { |
| struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd); |
| u8 control, counter0, counter1, counter2; |
| u32 counter; |
| |
| control = inb(wdt->io_base + NIWD_CONTROL); |
| control |= NIWD_CONTROL_CAPTURECOUNTER; |
| outb(control, wdt->io_base + NIWD_CONTROL); |
| |
| counter2 = inb(wdt->io_base + NIWD_COUNTER2); |
| counter1 = inb(wdt->io_base + NIWD_COUNTER1); |
| counter0 = inb(wdt->io_base + NIWD_COUNTER0); |
| |
| counter = (counter2 << 16) | (counter1 << 8) | counter0; |
| |
| return counter / (1000000000 / NIWD_PERIOD_NS); |
| } |
| |
| static int ni903x_wdd_ping(struct watchdog_device *wdd) |
| { |
| struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd); |
| u8 control; |
| |
| control = inb(wdt->io_base + NIWD_CONTROL); |
| outb(control | NIWD_CONTROL_PET, wdt->io_base + NIWD_CONTROL); |
| |
| return 0; |
| } |
| |
| static int ni903x_wdd_start(struct watchdog_device *wdd) |
| { |
| struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd); |
| |
| outb(NIWD_CONTROL_RESET | NIWD_CONTROL_PROC_RESET, |
| wdt->io_base + NIWD_CONTROL); |
| |
| ni903x_wdd_set_timeout(wdd, wdd->timeout); |
| ni903x_start(wdt); |
| |
| return 0; |
| } |
| |
| static int ni903x_wdd_stop(struct watchdog_device *wdd) |
| { |
| struct ni903x_wdt *wdt = watchdog_get_drvdata(wdd); |
| |
| outb(NIWD_CONTROL_RESET, wdt->io_base + NIWD_CONTROL); |
| |
| return 0; |
| } |
| |
| static acpi_status ni903x_resources(struct acpi_resource *res, void *data) |
| { |
| struct ni903x_wdt *wdt = data; |
| u16 io_size; |
| |
| switch (res->type) { |
| case ACPI_RESOURCE_TYPE_IO: |
| if (wdt->io_base != 0) { |
| dev_err(wdt->dev, "too many IO resources\n"); |
| return AE_ERROR; |
| } |
| |
| wdt->io_base = res->data.io.minimum; |
| io_size = res->data.io.address_length; |
| |
| if (io_size < NIWD_IO_SIZE) { |
| dev_err(wdt->dev, "memory region too small\n"); |
| return AE_ERROR; |
| } |
| |
| if (!devm_request_region(wdt->dev, wdt->io_base, io_size, |
| NIWD_NAME)) { |
| dev_err(wdt->dev, "failed to get memory region\n"); |
| return AE_ERROR; |
| } |
| |
| return AE_OK; |
| |
| case ACPI_RESOURCE_TYPE_END_TAG: |
| default: |
| /* Ignore unsupported resources, e.g. IRQ */ |
| return AE_OK; |
| } |
| } |
| |
| static const struct watchdog_info ni903x_wdd_info = { |
| .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE, |
| .identity = "NI Watchdog", |
| }; |
| |
| static const struct watchdog_ops ni903x_wdd_ops = { |
| .owner = THIS_MODULE, |
| .start = ni903x_wdd_start, |
| .stop = ni903x_wdd_stop, |
| .ping = ni903x_wdd_ping, |
| .set_timeout = ni903x_wdd_set_timeout, |
| .get_timeleft = ni903x_wdd_get_timeleft, |
| }; |
| |
| static int ni903x_acpi_add(struct acpi_device *device) |
| { |
| struct device *dev = &device->dev; |
| struct watchdog_device *wdd; |
| struct ni903x_wdt *wdt; |
| acpi_status status; |
| int ret; |
| |
| wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL); |
| if (!wdt) |
| return -ENOMEM; |
| |
| device->driver_data = wdt; |
| wdt->dev = dev; |
| |
| status = acpi_walk_resources(device->handle, METHOD_NAME__CRS, |
| ni903x_resources, wdt); |
| if (ACPI_FAILURE(status) || wdt->io_base == 0) { |
| dev_err(dev, "failed to get resources\n"); |
| return -ENODEV; |
| } |
| |
| wdd = &wdt->wdd; |
| wdd->info = &ni903x_wdd_info; |
| wdd->ops = &ni903x_wdd_ops; |
| wdd->min_timeout = NIWD_MIN_TIMEOUT; |
| wdd->max_timeout = NIWD_MAX_TIMEOUT; |
| wdd->timeout = NIWD_DEFAULT_TIMEOUT; |
| wdd->parent = dev; |
| watchdog_set_drvdata(wdd, wdt); |
| watchdog_set_nowayout(wdd, nowayout); |
| watchdog_init_timeout(wdd, timeout, dev); |
| |
| ret = watchdog_register_device(wdd); |
| if (ret) |
| return ret; |
| |
| /* Switch from boot mode to user mode */ |
| outb(NIWD_CONTROL_RESET | NIWD_CONTROL_MODE, |
| wdt->io_base + NIWD_CONTROL); |
| |
| dev_dbg(dev, "io_base=0x%04X, timeout=%d, nowayout=%d\n", |
| wdt->io_base, timeout, nowayout); |
| |
| return 0; |
| } |
| |
| static int ni903x_acpi_remove(struct acpi_device *device) |
| { |
| struct ni903x_wdt *wdt = acpi_driver_data(device); |
| |
| ni903x_wdd_stop(&wdt->wdd); |
| watchdog_unregister_device(&wdt->wdd); |
| |
| return 0; |
| } |
| |
| static const struct acpi_device_id ni903x_device_ids[] = { |
| {"NIC775C", 0}, |
| {"", 0}, |
| }; |
| MODULE_DEVICE_TABLE(acpi, ni903x_device_ids); |
| |
| static struct acpi_driver ni903x_acpi_driver = { |
| .name = NIWD_NAME, |
| .ids = ni903x_device_ids, |
| .ops = { |
| .add = ni903x_acpi_add, |
| .remove = ni903x_acpi_remove, |
| }, |
| }; |
| |
| module_acpi_driver(ni903x_acpi_driver); |
| |
| MODULE_DESCRIPTION("NI 903x Watchdog"); |
| MODULE_AUTHOR("Jeff Westfahl <jeff.westfahl@ni.com>"); |
| MODULE_AUTHOR("Kyle Roeschley <kyle.roeschley@ni.com>"); |
| MODULE_LICENSE("GPL"); |