diff options
Diffstat (limited to 'hw/watchdog/wdt_aspeed.c')
| -rw-r--r-- | hw/watchdog/wdt_aspeed.c | 421 |
1 files changed, 421 insertions, 0 deletions
diff --git a/hw/watchdog/wdt_aspeed.c b/hw/watchdog/wdt_aspeed.c new file mode 100644 index 00000000..d753693a --- /dev/null +++ b/hw/watchdog/wdt_aspeed.c @@ -0,0 +1,421 @@ +/* + * ASPEED Watchdog Controller + * + * Copyright (C) 2016-2017 IBM Corp. + * + * This code is licensed under the GPL version 2 or later. See the + * COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" + +#include "qapi/error.h" +#include "qemu/log.h" +#include "qemu/module.h" +#include "qemu/timer.h" +#include "sysemu/watchdog.h" +#include "hw/misc/aspeed_scu.h" +#include "hw/qdev-properties.h" +#include "hw/sysbus.h" +#include "hw/watchdog/wdt_aspeed.h" +#include "migration/vmstate.h" +#include "trace.h" + +#define WDT_STATUS (0x00 / 4) +#define WDT_RELOAD_VALUE (0x04 / 4) +#define WDT_RESTART (0x08 / 4) +#define WDT_CTRL (0x0C / 4) +#define WDT_CTRL_RESET_MODE_SOC (0x00 << 5) +#define WDT_CTRL_RESET_MODE_FULL_CHIP (0x01 << 5) +#define WDT_CTRL_1MHZ_CLK BIT(4) +#define WDT_CTRL_WDT_EXT BIT(3) +#define WDT_CTRL_WDT_INTR BIT(2) +#define WDT_CTRL_RESET_SYSTEM BIT(1) +#define WDT_CTRL_ENABLE BIT(0) +#define WDT_RESET_WIDTH (0x18 / 4) +#define WDT_RESET_WIDTH_ACTIVE_HIGH BIT(31) +#define WDT_POLARITY_MASK (0xFF << 24) +#define WDT_ACTIVE_HIGH_MAGIC (0xA5 << 24) +#define WDT_ACTIVE_LOW_MAGIC (0x5A << 24) +#define WDT_RESET_WIDTH_PUSH_PULL BIT(30) +#define WDT_DRIVE_TYPE_MASK (0xFF << 24) +#define WDT_PUSH_PULL_MAGIC (0xA8 << 24) +#define WDT_OPEN_DRAIN_MAGIC (0x8A << 24) +#define WDT_RESET_MASK1 (0x1c / 4) + +#define WDT_TIMEOUT_STATUS (0x10 / 4) +#define WDT_TIMEOUT_CLEAR (0x14 / 4) + +#define WDT_RESTART_MAGIC 0x4755 + +#define AST2600_SCU_RESET_CONTROL1 (0x40 / 4) +#define SCU_RESET_CONTROL1 (0x04 / 4) +#define SCU_RESET_SDRAM BIT(0) + +static bool aspeed_wdt_is_enabled(const AspeedWDTState *s) +{ + return s->regs[WDT_CTRL] & WDT_CTRL_ENABLE; +} + +static uint64_t aspeed_wdt_read(void *opaque, hwaddr offset, unsigned size) +{ + AspeedWDTState *s = ASPEED_WDT(opaque); + + trace_aspeed_wdt_read(offset, size); + + offset >>= 2; + + switch (offset) { + case WDT_STATUS: + return s->regs[WDT_STATUS]; + case WDT_RELOAD_VALUE: + return s->regs[WDT_RELOAD_VALUE]; + case WDT_RESTART: + qemu_log_mask(LOG_GUEST_ERROR, + "%s: read from write-only reg at offset 0x%" + HWADDR_PRIx "\n", __func__, offset); + return 0; + case WDT_CTRL: + return s->regs[WDT_CTRL]; + case WDT_RESET_WIDTH: + return s->regs[WDT_RESET_WIDTH]; + case WDT_RESET_MASK1: + return s->regs[WDT_RESET_MASK1]; + case WDT_TIMEOUT_STATUS: + case WDT_TIMEOUT_CLEAR: + qemu_log_mask(LOG_UNIMP, + "%s: uninmplemented read at offset 0x%" HWADDR_PRIx "\n", + __func__, offset); + return 0; + default: + qemu_log_mask(LOG_GUEST_ERROR, + "%s: Out-of-bounds read at offset 0x%" HWADDR_PRIx "\n", + __func__, offset); + return 0; + } + +} + +static void aspeed_wdt_reload(AspeedWDTState *s) +{ + uint64_t reload; + + if (!(s->regs[WDT_CTRL] & WDT_CTRL_1MHZ_CLK)) { + reload = muldiv64(s->regs[WDT_RELOAD_VALUE], NANOSECONDS_PER_SECOND, + s->pclk_freq); + } else { + reload = s->regs[WDT_RELOAD_VALUE] * 1000ULL; + } + + if (aspeed_wdt_is_enabled(s)) { + timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + reload); + } +} + +static void aspeed_wdt_reload_1mhz(AspeedWDTState *s) +{ + uint64_t reload = s->regs[WDT_RELOAD_VALUE] * 1000ULL; + + if (aspeed_wdt_is_enabled(s)) { + timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + reload); + } +} + +static uint64_t aspeed_2400_sanitize_ctrl(uint64_t data) +{ + return data & 0xffff; +} + +static uint64_t aspeed_2500_sanitize_ctrl(uint64_t data) +{ + return (data & ~(0xfUL << 8)) | WDT_CTRL_1MHZ_CLK; +} + +static uint64_t aspeed_2600_sanitize_ctrl(uint64_t data) +{ + return data & ~(0x7UL << 7); +} + +static void aspeed_wdt_write(void *opaque, hwaddr offset, uint64_t data, + unsigned size) +{ + AspeedWDTState *s = ASPEED_WDT(opaque); + AspeedWDTClass *awc = ASPEED_WDT_GET_CLASS(s); + bool enable; + + trace_aspeed_wdt_write(offset, size, data); + + offset >>= 2; + + switch (offset) { + case WDT_STATUS: + qemu_log_mask(LOG_GUEST_ERROR, + "%s: write to read-only reg at offset 0x%" + HWADDR_PRIx "\n", __func__, offset); + break; + case WDT_RELOAD_VALUE: + s->regs[WDT_RELOAD_VALUE] = data; + break; + case WDT_RESTART: + if ((data & 0xFFFF) == WDT_RESTART_MAGIC) { + s->regs[WDT_STATUS] = s->regs[WDT_RELOAD_VALUE]; + awc->wdt_reload(s); + } + break; + case WDT_CTRL: + data = awc->sanitize_ctrl(data); + enable = data & WDT_CTRL_ENABLE; + if (enable && !aspeed_wdt_is_enabled(s)) { + s->regs[WDT_CTRL] = data; + awc->wdt_reload(s); + } else if (!enable && aspeed_wdt_is_enabled(s)) { + s->regs[WDT_CTRL] = data; + timer_del(s->timer); + } else { + s->regs[WDT_CTRL] = data; + } + break; + case WDT_RESET_WIDTH: + if (awc->reset_pulse) { + awc->reset_pulse(s, data & WDT_POLARITY_MASK); + } + s->regs[WDT_RESET_WIDTH] &= ~awc->ext_pulse_width_mask; + s->regs[WDT_RESET_WIDTH] |= data & awc->ext_pulse_width_mask; + break; + + case WDT_RESET_MASK1: + /* TODO: implement */ + s->regs[WDT_RESET_MASK1] = data; + break; + + case WDT_TIMEOUT_STATUS: + case WDT_TIMEOUT_CLEAR: + qemu_log_mask(LOG_UNIMP, + "%s: uninmplemented write at offset 0x%" HWADDR_PRIx "\n", + __func__, offset); + break; + default: + qemu_log_mask(LOG_GUEST_ERROR, + "%s: Out-of-bounds write at offset 0x%" HWADDR_PRIx "\n", + __func__, offset); + } + return; +} + +static const VMStateDescription vmstate_aspeed_wdt = { + .name = "vmstate_aspeed_wdt", + .version_id = 0, + .minimum_version_id = 0, + .fields = (VMStateField[]) { + VMSTATE_TIMER_PTR(timer, AspeedWDTState), + VMSTATE_UINT32_ARRAY(regs, AspeedWDTState, ASPEED_WDT_REGS_MAX), + VMSTATE_END_OF_LIST() + } +}; + +static const MemoryRegionOps aspeed_wdt_ops = { + .read = aspeed_wdt_read, + .write = aspeed_wdt_write, + .endianness = DEVICE_LITTLE_ENDIAN, + .valid.min_access_size = 4, + .valid.max_access_size = 4, + .valid.unaligned = false, +}; + +static void aspeed_wdt_reset(DeviceState *dev) +{ + AspeedWDTState *s = ASPEED_WDT(dev); + AspeedWDTClass *awc = ASPEED_WDT_GET_CLASS(s); + + s->regs[WDT_STATUS] = awc->default_status; + s->regs[WDT_RELOAD_VALUE] = awc->default_reload_value; + s->regs[WDT_RESTART] = 0; + s->regs[WDT_CTRL] = awc->sanitize_ctrl(0); + s->regs[WDT_RESET_WIDTH] = 0xFF; + + timer_del(s->timer); +} + +static void aspeed_wdt_timer_expired(void *dev) +{ + AspeedWDTState *s = ASPEED_WDT(dev); + uint32_t reset_ctrl_reg = ASPEED_WDT_GET_CLASS(s)->reset_ctrl_reg; + + /* Do not reset on SDRAM controller reset */ + if (s->scu->regs[reset_ctrl_reg] & SCU_RESET_SDRAM) { + timer_del(s->timer); + s->regs[WDT_CTRL] = 0; + return; + } + + qemu_log_mask(CPU_LOG_RESET, "Watchdog timer %" HWADDR_PRIx " expired.\n", + s->iomem.addr); + watchdog_perform_action(); + timer_del(s->timer); +} + +#define PCLK_HZ 24000000 + +static void aspeed_wdt_realize(DeviceState *dev, Error **errp) +{ + SysBusDevice *sbd = SYS_BUS_DEVICE(dev); + AspeedWDTState *s = ASPEED_WDT(dev); + + assert(s->scu); + + s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, aspeed_wdt_timer_expired, dev); + + /* FIXME: This setting should be derived from the SCU hw strapping + * register SCU70 + */ + s->pclk_freq = PCLK_HZ; + + memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_wdt_ops, s, + TYPE_ASPEED_WDT, ASPEED_WDT_REGS_MAX * 4); + sysbus_init_mmio(sbd, &s->iomem); +} + +static Property aspeed_wdt_properties[] = { + DEFINE_PROP_LINK("scu", AspeedWDTState, scu, TYPE_ASPEED_SCU, + AspeedSCUState *), + DEFINE_PROP_END_OF_LIST(), +}; + +static void aspeed_wdt_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + + dc->desc = "ASPEED Watchdog Controller"; + dc->realize = aspeed_wdt_realize; + dc->reset = aspeed_wdt_reset; + set_bit(DEVICE_CATEGORY_WATCHDOG, dc->categories); + dc->vmsd = &vmstate_aspeed_wdt; + device_class_set_props(dc, aspeed_wdt_properties); + dc->desc = "Aspeed watchdog device"; +} + +static const TypeInfo aspeed_wdt_info = { + .parent = TYPE_SYS_BUS_DEVICE, + .name = TYPE_ASPEED_WDT, + .instance_size = sizeof(AspeedWDTState), + .class_init = aspeed_wdt_class_init, + .class_size = sizeof(AspeedWDTClass), + .abstract = true, +}; + +static void aspeed_2400_wdt_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass); + + dc->desc = "ASPEED 2400 Watchdog Controller"; + awc->offset = 0x20; + awc->ext_pulse_width_mask = 0xff; + awc->reset_ctrl_reg = SCU_RESET_CONTROL1; + awc->wdt_reload = aspeed_wdt_reload; + awc->sanitize_ctrl = aspeed_2400_sanitize_ctrl; + awc->default_status = 0x03EF1480; + awc->default_reload_value = 0x03EF1480; +} + +static const TypeInfo aspeed_2400_wdt_info = { + .name = TYPE_ASPEED_2400_WDT, + .parent = TYPE_ASPEED_WDT, + .instance_size = sizeof(AspeedWDTState), + .class_init = aspeed_2400_wdt_class_init, +}; + +static void aspeed_2500_wdt_reset_pulse(AspeedWDTState *s, uint32_t property) +{ + if (property) { + if (property == WDT_ACTIVE_HIGH_MAGIC) { + s->regs[WDT_RESET_WIDTH] |= WDT_RESET_WIDTH_ACTIVE_HIGH; + } else if (property == WDT_ACTIVE_LOW_MAGIC) { + s->regs[WDT_RESET_WIDTH] &= ~WDT_RESET_WIDTH_ACTIVE_HIGH; + } else if (property == WDT_PUSH_PULL_MAGIC) { + s->regs[WDT_RESET_WIDTH] |= WDT_RESET_WIDTH_PUSH_PULL; + } else if (property == WDT_OPEN_DRAIN_MAGIC) { + s->regs[WDT_RESET_WIDTH] &= ~WDT_RESET_WIDTH_PUSH_PULL; + } + } +} + +static void aspeed_2500_wdt_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass); + + dc->desc = "ASPEED 2500 Watchdog Controller"; + awc->offset = 0x20; + awc->ext_pulse_width_mask = 0xfffff; + awc->reset_ctrl_reg = SCU_RESET_CONTROL1; + awc->reset_pulse = aspeed_2500_wdt_reset_pulse; + awc->wdt_reload = aspeed_wdt_reload_1mhz; + awc->sanitize_ctrl = aspeed_2500_sanitize_ctrl; + awc->default_status = 0x014FB180; + awc->default_reload_value = 0x014FB180; +} + +static const TypeInfo aspeed_2500_wdt_info = { + .name = TYPE_ASPEED_2500_WDT, + .parent = TYPE_ASPEED_WDT, + .instance_size = sizeof(AspeedWDTState), + .class_init = aspeed_2500_wdt_class_init, +}; + +static void aspeed_2600_wdt_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass); + + dc->desc = "ASPEED 2600 Watchdog Controller"; + awc->offset = 0x40; + awc->ext_pulse_width_mask = 0xfffff; /* TODO */ + awc->reset_ctrl_reg = AST2600_SCU_RESET_CONTROL1; + awc->reset_pulse = aspeed_2500_wdt_reset_pulse; + awc->wdt_reload = aspeed_wdt_reload_1mhz; + awc->sanitize_ctrl = aspeed_2600_sanitize_ctrl; + awc->default_status = 0x014FB180; + awc->default_reload_value = 0x014FB180; +} + +static const TypeInfo aspeed_2600_wdt_info = { + .name = TYPE_ASPEED_2600_WDT, + .parent = TYPE_ASPEED_WDT, + .instance_size = sizeof(AspeedWDTState), + .class_init = aspeed_2600_wdt_class_init, +}; + +static void aspeed_1030_wdt_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass); + + dc->desc = "ASPEED 1030 Watchdog Controller"; + awc->offset = 0x80; + awc->ext_pulse_width_mask = 0xfffff; /* TODO */ + awc->reset_ctrl_reg = AST2600_SCU_RESET_CONTROL1; + awc->reset_pulse = aspeed_2500_wdt_reset_pulse; + awc->wdt_reload = aspeed_wdt_reload_1mhz; + awc->sanitize_ctrl = aspeed_2600_sanitize_ctrl; + awc->default_status = 0x014FB180; + awc->default_reload_value = 0x014FB180; +} + +static const TypeInfo aspeed_1030_wdt_info = { + .name = TYPE_ASPEED_1030_WDT, + .parent = TYPE_ASPEED_WDT, + .instance_size = sizeof(AspeedWDTState), + .class_init = aspeed_1030_wdt_class_init, +}; + +static void wdt_aspeed_register_types(void) +{ + type_register_static(&aspeed_wdt_info); + type_register_static(&aspeed_2400_wdt_info); + type_register_static(&aspeed_2500_wdt_info); + type_register_static(&aspeed_2600_wdt_info); + type_register_static(&aspeed_1030_wdt_info); +} + +type_init(wdt_aspeed_register_types) |