diff options
Diffstat (limited to 'hw/timer/pl031.c')
| -rw-r--r-- | hw/timer/pl031.c | 344 |
1 files changed, 0 insertions, 344 deletions
diff --git a/hw/timer/pl031.c b/hw/timer/pl031.c deleted file mode 100644 index 2b3e261006..0000000000 --- a/hw/timer/pl031.c +++ /dev/null @@ -1,344 +0,0 @@ -/* - * ARM AMBA PrimeCell PL031 RTC - * - * Copyright (c) 2007 CodeSourcery - * - * This file is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * Contributions after 2012-01-13 are licensed under the terms of the - * GNU GPL, version 2 or (at your option) any later version. - */ - -#include "qemu/osdep.h" -#include "qemu-common.h" -#include "hw/timer/pl031.h" -#include "migration/vmstate.h" -#include "hw/irq.h" -#include "hw/qdev-properties.h" -#include "hw/sysbus.h" -#include "qemu/timer.h" -#include "sysemu/sysemu.h" -#include "qemu/cutils.h" -#include "qemu/log.h" -#include "qemu/module.h" -#include "trace.h" - -#define RTC_DR 0x00 /* Data read register */ -#define RTC_MR 0x04 /* Match register */ -#define RTC_LR 0x08 /* Data load register */ -#define RTC_CR 0x0c /* Control register */ -#define RTC_IMSC 0x10 /* Interrupt mask and set register */ -#define RTC_RIS 0x14 /* Raw interrupt status register */ -#define RTC_MIS 0x18 /* Masked interrupt status register */ -#define RTC_ICR 0x1c /* Interrupt clear register */ - -static const unsigned char pl031_id[] = { - 0x31, 0x10, 0x14, 0x00, /* Device ID */ - 0x0d, 0xf0, 0x05, 0xb1 /* Cell ID */ -}; - -static void pl031_update(PL031State *s) -{ - uint32_t flags = s->is & s->im; - - trace_pl031_irq_state(flags); - qemu_set_irq(s->irq, flags); -} - -static void pl031_interrupt(void * opaque) -{ - PL031State *s = (PL031State *)opaque; - - s->is = 1; - trace_pl031_alarm_raised(); - pl031_update(s); -} - -static uint32_t pl031_get_count(PL031State *s) -{ - int64_t now = qemu_clock_get_ns(rtc_clock); - return s->tick_offset + now / NANOSECONDS_PER_SECOND; -} - -static void pl031_set_alarm(PL031State *s) -{ - uint32_t ticks; - - /* The timer wraps around. This subtraction also wraps in the same way, - and gives correct results when alarm < now_ticks. */ - ticks = s->mr - pl031_get_count(s); - trace_pl031_set_alarm(ticks); - if (ticks == 0) { - timer_del(s->timer); - pl031_interrupt(s); - } else { - int64_t now = qemu_clock_get_ns(rtc_clock); - timer_mod(s->timer, now + (int64_t)ticks * NANOSECONDS_PER_SECOND); - } -} - -static uint64_t pl031_read(void *opaque, hwaddr offset, - unsigned size) -{ - PL031State *s = (PL031State *)opaque; - uint64_t r; - - switch (offset) { - case RTC_DR: - r = pl031_get_count(s); - break; - case RTC_MR: - r = s->mr; - break; - case RTC_IMSC: - r = s->im; - break; - case RTC_RIS: - r = s->is; - break; - case RTC_LR: - r = s->lr; - break; - case RTC_CR: - /* RTC is permanently enabled. */ - r = 1; - break; - case RTC_MIS: - r = s->is & s->im; - break; - case 0xfe0 ... 0xfff: - r = pl031_id[(offset - 0xfe0) >> 2]; - break; - case RTC_ICR: - qemu_log_mask(LOG_GUEST_ERROR, - "pl031: read of write-only register at offset 0x%x\n", - (int)offset); - r = 0; - break; - default: - qemu_log_mask(LOG_GUEST_ERROR, - "pl031_read: Bad offset 0x%x\n", (int)offset); - r = 0; - break; - } - - trace_pl031_read(offset, r); - return r; -} - -static void pl031_write(void * opaque, hwaddr offset, - uint64_t value, unsigned size) -{ - PL031State *s = (PL031State *)opaque; - - trace_pl031_write(offset, value); - - switch (offset) { - case RTC_LR: - s->tick_offset += value - pl031_get_count(s); - pl031_set_alarm(s); - break; - case RTC_MR: - s->mr = value; - pl031_set_alarm(s); - break; - case RTC_IMSC: - s->im = value & 1; - pl031_update(s); - break; - case RTC_ICR: - /* The PL031 documentation (DDI0224B) states that the interrupt is - cleared when bit 0 of the written value is set. However the - arm926e documentation (DDI0287B) states that the interrupt is - cleared when any value is written. */ - s->is = 0; - pl031_update(s); - break; - case RTC_CR: - /* Written value is ignored. */ - break; - - case RTC_DR: - case RTC_MIS: - case RTC_RIS: - qemu_log_mask(LOG_GUEST_ERROR, - "pl031: write to read-only register at offset 0x%x\n", - (int)offset); - break; - - default: - qemu_log_mask(LOG_GUEST_ERROR, - "pl031_write: Bad offset 0x%x\n", (int)offset); - break; - } -} - -static const MemoryRegionOps pl031_ops = { - .read = pl031_read, - .write = pl031_write, - .endianness = DEVICE_NATIVE_ENDIAN, -}; - -static void pl031_init(Object *obj) -{ - PL031State *s = PL031(obj); - SysBusDevice *dev = SYS_BUS_DEVICE(obj); - struct tm tm; - - memory_region_init_io(&s->iomem, obj, &pl031_ops, s, "pl031", 0x1000); - sysbus_init_mmio(dev, &s->iomem); - - sysbus_init_irq(dev, &s->irq); - qemu_get_timedate(&tm, 0); - s->tick_offset = mktimegm(&tm) - - qemu_clock_get_ns(rtc_clock) / NANOSECONDS_PER_SECOND; - - s->timer = timer_new_ns(rtc_clock, pl031_interrupt, s); -} - -static int pl031_pre_save(void *opaque) -{ - PL031State *s = opaque; - - /* - * The PL031 device model code uses the tick_offset field, which is - * the offset between what the guest RTC should read and what the - * QEMU rtc_clock reads: - * guest_rtc = rtc_clock + tick_offset - * and so - * tick_offset = guest_rtc - rtc_clock - * - * We want to migrate this offset, which sounds straightforward. - * Unfortunately older versions of QEMU migrated a conversion of this - * offset into an offset from the vm_clock. (This was in turn an - * attempt to be compatible with even older QEMU versions, but it - * has incorrect behaviour if the rtc_clock is not the same as the - * vm_clock.) So we put the actual tick_offset into a migration - * subsection, and the backwards-compatible time-relative-to-vm_clock - * in the main migration state. - * - * Calculate base time relative to QEMU_CLOCK_VIRTUAL: - */ - int64_t delta = qemu_clock_get_ns(rtc_clock) - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); - s->tick_offset_vmstate = s->tick_offset + delta / NANOSECONDS_PER_SECOND; - - return 0; -} - -static int pl031_pre_load(void *opaque) -{ - PL031State *s = opaque; - - s->tick_offset_migrated = false; - return 0; -} - -static int pl031_post_load(void *opaque, int version_id) -{ - PL031State *s = opaque; - - /* - * If we got the tick_offset subsection, then we can just use - * the value in that. Otherwise the source is an older QEMU and - * has given us the offset from the vm_clock; convert it back to - * an offset from the rtc_clock. This will cause time to incorrectly - * go backwards compared to the host RTC, but this is unavoidable. - */ - - if (!s->tick_offset_migrated) { - int64_t delta = qemu_clock_get_ns(rtc_clock) - - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); - s->tick_offset = s->tick_offset_vmstate - - delta / NANOSECONDS_PER_SECOND; - } - pl031_set_alarm(s); - return 0; -} - -static int pl031_tick_offset_post_load(void *opaque, int version_id) -{ - PL031State *s = opaque; - - s->tick_offset_migrated = true; - return 0; -} - -static bool pl031_tick_offset_needed(void *opaque) -{ - PL031State *s = opaque; - - return s->migrate_tick_offset; -} - -static const VMStateDescription vmstate_pl031_tick_offset = { - .name = "pl031/tick-offset", - .version_id = 1, - .minimum_version_id = 1, - .needed = pl031_tick_offset_needed, - .post_load = pl031_tick_offset_post_load, - .fields = (VMStateField[]) { - VMSTATE_UINT32(tick_offset, PL031State), - VMSTATE_END_OF_LIST() - } -}; - -static const VMStateDescription vmstate_pl031 = { - .name = "pl031", - .version_id = 1, - .minimum_version_id = 1, - .pre_save = pl031_pre_save, - .pre_load = pl031_pre_load, - .post_load = pl031_post_load, - .fields = (VMStateField[]) { - VMSTATE_UINT32(tick_offset_vmstate, PL031State), - VMSTATE_UINT32(mr, PL031State), - VMSTATE_UINT32(lr, PL031State), - VMSTATE_UINT32(cr, PL031State), - VMSTATE_UINT32(im, PL031State), - VMSTATE_UINT32(is, PL031State), - VMSTATE_END_OF_LIST() - }, - .subsections = (const VMStateDescription*[]) { - &vmstate_pl031_tick_offset, - NULL - } -}; - -static Property pl031_properties[] = { - /* - * True to correctly migrate the tick offset of the RTC. False to - * obtain backward migration compatibility with older QEMU versions, - * at the expense of the guest RTC going backwards compared with the - * host RTC when the VM is saved/restored if using -rtc host. - * (Even if set to 'true' older QEMU can migrate forward to newer QEMU; - * 'false' also permits newer QEMU to migrate to older QEMU.) - */ - DEFINE_PROP_BOOL("migrate-tick-offset", - PL031State, migrate_tick_offset, true), - DEFINE_PROP_END_OF_LIST() -}; - -static void pl031_class_init(ObjectClass *klass, void *data) -{ - DeviceClass *dc = DEVICE_CLASS(klass); - - dc->vmsd = &vmstate_pl031; - dc->props = pl031_properties; -} - -static const TypeInfo pl031_info = { - .name = TYPE_PL031, - .parent = TYPE_SYS_BUS_DEVICE, - .instance_size = sizeof(PL031State), - .instance_init = pl031_init, - .class_init = pl031_class_init, -}; - -static void pl031_register_types(void) -{ - type_register_static(&pl031_info); -} - -type_init(pl031_register_types) |