diff options
Diffstat (limited to 'qemu/hw/timer/i8254.c')
| -rw-r--r-- | qemu/hw/timer/i8254.c | 384 |
1 files changed, 0 insertions, 384 deletions
diff --git a/qemu/hw/timer/i8254.c b/qemu/hw/timer/i8254.c deleted file mode 100644 index 5e61ad50a..000000000 --- a/qemu/hw/timer/i8254.c +++ /dev/null @@ -1,384 +0,0 @@ -/* - * QEMU 8253/8254 interval timer emulation - * - * Copyright (c) 2003-2004 Fabrice Bellard - * - * Permission is hereby granted, free of charge, to any person obtaining a copy - * of this software and associated documentation files (the "Software"), to deal - * in the Software without restriction, including without limitation the rights - * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell - * copies of the Software, and to permit persons to whom the Software is - * furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice shall be included in - * all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL - * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER - * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, - * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN - * THE SOFTWARE. - */ -#include "qemu/osdep.h" -#include "hw/hw.h" -#include "hw/i386/pc.h" -#include "hw/isa/isa.h" -#include "qemu/timer.h" -#include "hw/timer/i8254.h" -#include "hw/timer/i8254_internal.h" - -//#define DEBUG_PIT - -#define RW_STATE_LSB 1 -#define RW_STATE_MSB 2 -#define RW_STATE_WORD0 3 -#define RW_STATE_WORD1 4 - -#define PIT_CLASS(class) OBJECT_CLASS_CHECK(PITClass, (class), TYPE_I8254) -#define PIT_GET_CLASS(obj) OBJECT_GET_CLASS(PITClass, (obj), TYPE_I8254) - -typedef struct PITClass { - PITCommonClass parent_class; - - DeviceRealize parent_realize; -} PITClass; - -static void pit_irq_timer_update(PITChannelState *s, int64_t current_time); - -static int pit_get_count(PITChannelState *s) -{ - uint64_t d; - int counter; - - d = muldiv64(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - s->count_load_time, PIT_FREQ, - NANOSECONDS_PER_SECOND); - switch(s->mode) { - case 0: - case 1: - case 4: - case 5: - counter = (s->count - d) & 0xffff; - break; - case 3: - /* XXX: may be incorrect for odd counts */ - counter = s->count - ((2 * d) % s->count); - break; - default: - counter = s->count - (d % s->count); - break; - } - return counter; -} - -/* val must be 0 or 1 */ -static void pit_set_channel_gate(PITCommonState *s, PITChannelState *sc, - int val) -{ - switch (sc->mode) { - default: - case 0: - case 4: - /* XXX: just disable/enable counting */ - break; - case 1: - case 5: - if (sc->gate < val) { - /* restart counting on rising edge */ - sc->count_load_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); - pit_irq_timer_update(sc, sc->count_load_time); - } - break; - case 2: - case 3: - if (sc->gate < val) { - /* restart counting on rising edge */ - sc->count_load_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); - pit_irq_timer_update(sc, sc->count_load_time); - } - /* XXX: disable/enable counting */ - break; - } - sc->gate = val; -} - -static inline void pit_load_count(PITChannelState *s, int val) -{ - if (val == 0) - val = 0x10000; - s->count_load_time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); - s->count = val; - pit_irq_timer_update(s, s->count_load_time); -} - -/* if already latched, do not latch again */ -static void pit_latch_count(PITChannelState *s) -{ - if (!s->count_latched) { - s->latched_count = pit_get_count(s); - s->count_latched = s->rw_mode; - } -} - -static void pit_ioport_write(void *opaque, hwaddr addr, - uint64_t val, unsigned size) -{ - PITCommonState *pit = opaque; - int channel, access; - PITChannelState *s; - - addr &= 3; - if (addr == 3) { - channel = val >> 6; - if (channel == 3) { - /* read back command */ - for(channel = 0; channel < 3; channel++) { - s = &pit->channels[channel]; - if (val & (2 << channel)) { - if (!(val & 0x20)) { - pit_latch_count(s); - } - if (!(val & 0x10) && !s->status_latched) { - /* status latch */ - /* XXX: add BCD and null count */ - s->status = - (pit_get_out(s, - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)) << 7) | - (s->rw_mode << 4) | - (s->mode << 1) | - s->bcd; - s->status_latched = 1; - } - } - } - } else { - s = &pit->channels[channel]; - access = (val >> 4) & 3; - if (access == 0) { - pit_latch_count(s); - } else { - s->rw_mode = access; - s->read_state = access; - s->write_state = access; - - s->mode = (val >> 1) & 7; - s->bcd = val & 1; - /* XXX: update irq timer ? */ - } - } - } else { - s = &pit->channels[addr]; - switch(s->write_state) { - default: - case RW_STATE_LSB: - pit_load_count(s, val); - break; - case RW_STATE_MSB: - pit_load_count(s, val << 8); - break; - case RW_STATE_WORD0: - s->write_latch = val; - s->write_state = RW_STATE_WORD1; - break; - case RW_STATE_WORD1: - pit_load_count(s, s->write_latch | (val << 8)); - s->write_state = RW_STATE_WORD0; - break; - } - } -} - -static uint64_t pit_ioport_read(void *opaque, hwaddr addr, - unsigned size) -{ - PITCommonState *pit = opaque; - int ret, count; - PITChannelState *s; - - addr &= 3; - - if (addr == 3) { - /* Mode/Command register is write only, read is ignored */ - return 0; - } - - s = &pit->channels[addr]; - if (s->status_latched) { - s->status_latched = 0; - ret = s->status; - } else if (s->count_latched) { - switch(s->count_latched) { - default: - case RW_STATE_LSB: - ret = s->latched_count & 0xff; - s->count_latched = 0; - break; - case RW_STATE_MSB: - ret = s->latched_count >> 8; - s->count_latched = 0; - break; - case RW_STATE_WORD0: - ret = s->latched_count & 0xff; - s->count_latched = RW_STATE_MSB; - break; - } - } else { - switch(s->read_state) { - default: - case RW_STATE_LSB: - count = pit_get_count(s); - ret = count & 0xff; - break; - case RW_STATE_MSB: - count = pit_get_count(s); - ret = (count >> 8) & 0xff; - break; - case RW_STATE_WORD0: - count = pit_get_count(s); - ret = count & 0xff; - s->read_state = RW_STATE_WORD1; - break; - case RW_STATE_WORD1: - count = pit_get_count(s); - ret = (count >> 8) & 0xff; - s->read_state = RW_STATE_WORD0; - break; - } - } - return ret; -} - -static void pit_irq_timer_update(PITChannelState *s, int64_t current_time) -{ - int64_t expire_time; - int irq_level; - - if (!s->irq_timer || s->irq_disabled) { - return; - } - expire_time = pit_get_next_transition_time(s, current_time); - irq_level = pit_get_out(s, current_time); - qemu_set_irq(s->irq, irq_level); -#ifdef DEBUG_PIT - printf("irq_level=%d next_delay=%f\n", - irq_level, - (double)(expire_time - current_time) / NANOSECONDS_PER_SECOND); -#endif - s->next_transition_time = expire_time; - if (expire_time != -1) - timer_mod(s->irq_timer, expire_time); - else - timer_del(s->irq_timer); -} - -static void pit_irq_timer(void *opaque) -{ - PITChannelState *s = opaque; - - pit_irq_timer_update(s, s->next_transition_time); -} - -static void pit_reset(DeviceState *dev) -{ - PITCommonState *pit = PIT_COMMON(dev); - PITChannelState *s; - - pit_reset_common(pit); - - s = &pit->channels[0]; - if (!s->irq_disabled) { - timer_mod(s->irq_timer, s->next_transition_time); - } -} - -/* When HPET is operating in legacy mode, suppress the ignored timer IRQ, - * reenable it when legacy mode is left again. */ -static void pit_irq_control(void *opaque, int n, int enable) -{ - PITCommonState *pit = opaque; - PITChannelState *s = &pit->channels[0]; - - if (enable) { - s->irq_disabled = 0; - pit_irq_timer_update(s, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)); - } else { - s->irq_disabled = 1; - timer_del(s->irq_timer); - } -} - -static const MemoryRegionOps pit_ioport_ops = { - .read = pit_ioport_read, - .write = pit_ioport_write, - .impl = { - .min_access_size = 1, - .max_access_size = 1, - }, - .endianness = DEVICE_LITTLE_ENDIAN, -}; - -static void pit_post_load(PITCommonState *s) -{ - PITChannelState *sc = &s->channels[0]; - - if (sc->next_transition_time != -1) { - timer_mod(sc->irq_timer, sc->next_transition_time); - } else { - timer_del(sc->irq_timer); - } -} - -static void pit_realizefn(DeviceState *dev, Error **errp) -{ - PITCommonState *pit = PIT_COMMON(dev); - PITClass *pc = PIT_GET_CLASS(dev); - PITChannelState *s; - - s = &pit->channels[0]; - /* the timer 0 is connected to an IRQ */ - s->irq_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, pit_irq_timer, s); - qdev_init_gpio_out(dev, &s->irq, 1); - - memory_region_init_io(&pit->ioports, OBJECT(pit), &pit_ioport_ops, - pit, "pit", 4); - - qdev_init_gpio_in(dev, pit_irq_control, 1); - - pc->parent_realize(dev, errp); -} - -static Property pit_properties[] = { - DEFINE_PROP_UINT32("iobase", PITCommonState, iobase, -1), - DEFINE_PROP_END_OF_LIST(), -}; - -static void pit_class_initfn(ObjectClass *klass, void *data) -{ - PITClass *pc = PIT_CLASS(klass); - PITCommonClass *k = PIT_COMMON_CLASS(klass); - DeviceClass *dc = DEVICE_CLASS(klass); - - pc->parent_realize = dc->realize; - dc->realize = pit_realizefn; - k->set_channel_gate = pit_set_channel_gate; - k->get_channel_info = pit_get_channel_info_common; - k->post_load = pit_post_load; - dc->reset = pit_reset; - dc->props = pit_properties; -} - -static const TypeInfo pit_info = { - .name = TYPE_I8254, - .parent = TYPE_PIT_COMMON, - .instance_size = sizeof(PITCommonState), - .class_init = pit_class_initfn, - .class_size = sizeof(PITClass), -}; - -static void pit_register_types(void) -{ - type_register_static(&pit_info); -} - -type_init(pit_register_types) |