Blame view
drivers/watchdog/ni903x_wdt.c
6.16 KB
c942fddf8 treewide: Replace... |
1 |
// SPDX-License-Identifier: GPL-2.0-or-later |
70f399766 watchdog: ni903x_... |
2 3 |
/* * Copyright (C) 2016 National Instruments Corp. |
70f399766 watchdog: ni903x_... |
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 |
*/ #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 "); 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 "); 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 "); 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 "); 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); |
ff00800b6 watchdog: ni903x_... |
215 |
watchdog_init_timeout(wdd, timeout, dev); |
70f399766 watchdog: ni903x_... |
216 217 |
ret = watchdog_register_device(wdd); |
9076eb5df watchdog: ni903x_... |
218 |
if (ret) |
70f399766 watchdog: ni903x_... |
219 |
return ret; |
70f399766 watchdog: ni903x_... |
220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 |
/* 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 ", 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"); |