1 /* 2 * watchdog device diag288 support 3 * 4 * Copyright IBM, Corp. 2015 5 * 6 * Authors: 7 * Xu Wang <gesaint@linux.vnet.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2 or (at your 10 * option) any later version. See the COPYING file in the top-level directory. 11 * 12 */ 13 14 #include "sysemu/watchdog.h" 15 #include "hw/sysbus.h" 16 #include "qemu/timer.h" 17 #include "hw/watchdog/wdt_diag288.h" 18 19 static WatchdogTimerModel model = { 20 .wdt_name = TYPE_WDT_DIAG288, 21 .wdt_description = "diag288 device for s390x platform", 22 }; 23 24 static const VMStateDescription vmstate_diag288 = { 25 .name = "vmstate_diag288", 26 .version_id = 0, 27 .minimum_version_id = 0, 28 .fields = (VMStateField[]) { 29 VMSTATE_TIMER_PTR(timer, DIAG288State), 30 VMSTATE_BOOL(enabled, DIAG288State), 31 VMSTATE_END_OF_LIST() 32 } 33 }; 34 35 static void wdt_diag288_reset(DeviceState *dev) 36 { 37 DIAG288State *diag288 = DIAG288(dev); 38 39 diag288->enabled = false; 40 timer_del(diag288->timer); 41 } 42 43 static void diag288_timer_expired(void *dev) 44 { 45 qemu_log_mask(CPU_LOG_RESET, "Watchdog timer expired.\n"); 46 watchdog_perform_action(); 47 wdt_diag288_reset(dev); 48 } 49 50 static int wdt_diag288_handle_timer(DIAG288State *diag288, 51 uint64_t func, uint64_t timeout) 52 { 53 switch (func) { 54 case WDT_DIAG288_INIT: 55 diag288->enabled = true; 56 /* fall through */ 57 case WDT_DIAG288_CHANGE: 58 if (!diag288->enabled) { 59 return -1; 60 } 61 timer_mod(diag288->timer, 62 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + 63 timeout * get_ticks_per_sec()); 64 break; 65 case WDT_DIAG288_CANCEL: 66 if (!diag288->enabled) { 67 return -1; 68 } 69 diag288->enabled = false; 70 timer_del(diag288->timer); 71 break; 72 default: 73 return -1; 74 } 75 76 return 0; 77 } 78 79 static void wdt_diag288_realize(DeviceState *dev, Error **errp) 80 { 81 DIAG288State *diag288 = DIAG288(dev); 82 83 diag288->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, diag288_timer_expired, 84 dev); 85 } 86 87 static void wdt_diag288_unrealize(DeviceState *dev, Error **errp) 88 { 89 DIAG288State *diag288 = DIAG288(dev); 90 91 timer_del(diag288->timer); 92 timer_free(diag288->timer); 93 } 94 95 static void wdt_diag288_class_init(ObjectClass *klass, void *data) 96 { 97 DeviceClass *dc = DEVICE_CLASS(klass); 98 DIAG288Class *diag288 = DIAG288_CLASS(klass); 99 100 dc->realize = wdt_diag288_realize; 101 dc->unrealize = wdt_diag288_unrealize; 102 dc->reset = wdt_diag288_reset; 103 set_bit(DEVICE_CATEGORY_MISC, dc->categories); 104 dc->vmsd = &vmstate_diag288; 105 diag288->handle_timer = wdt_diag288_handle_timer; 106 } 107 108 static const TypeInfo wdt_diag288_info = { 109 .class_init = wdt_diag288_class_init, 110 .parent = TYPE_DEVICE, 111 .name = TYPE_WDT_DIAG288, 112 .instance_size = sizeof(DIAG288State), 113 .class_size = sizeof(DIAG288Class), 114 }; 115 116 static void wdt_diag288_register_types(void) 117 { 118 watchdog_add_model(&model); 119 type_register_static(&wdt_diag288_info); 120 } 121 122 type_init(wdt_diag288_register_types) 123