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qemu/hw/timer/mss-timer.c

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/*
* Block model of System timer present in
* Microsemi's SmartFusion2 and SmartFusion SoCs.
*
* Copyright (c) 2017 Subbaraya Sundeep <sundeep.lkml@gmail.com>.
*
* 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 "qemu/module.h"
#include "qemu/log.h"
#include "hw/irq.h"
#include "hw/qdev-properties.h"
#include "hw/timer/mss-timer.h"
#include "migration/vmstate.h"
#ifndef MSS_TIMER_ERR_DEBUG
#define MSS_TIMER_ERR_DEBUG 0
#endif
#define DB_PRINT_L(lvl, fmt, args...) do { \
if (MSS_TIMER_ERR_DEBUG >= lvl) { \
qemu_log("%s: " fmt "\n", __func__, ## args); \
} \
} while (0)
#define DB_PRINT(fmt, args...) DB_PRINT_L(1, fmt, ## args)
#define R_TIM_VAL 0
#define R_TIM_LOADVAL 1
#define R_TIM_BGLOADVAL 2
#define R_TIM_CTRL 3
#define R_TIM_RIS 4
#define R_TIM_MIS 5
#define TIMER_CTRL_ENBL (1 << 0)
#define TIMER_CTRL_ONESHOT (1 << 1)
#define TIMER_CTRL_INTR (1 << 2)
#define TIMER_RIS_ACK (1 << 0)
#define TIMER_RST_CLR (1 << 6)
#define TIMER_MODE (1 << 0)
static void timer_update_irq(struct Msf2Timer *st)
{
bool isr, ier;
isr = !!(st->regs[R_TIM_RIS] & TIMER_RIS_ACK);
ier = !!(st->regs[R_TIM_CTRL] & TIMER_CTRL_INTR);
qemu_set_irq(st->irq, (ier && isr));
}
/* Must be called from within a ptimer_transaction_begin/commit block */
static void timer_update(struct Msf2Timer *st)
{
uint64_t count;
if (!(st->regs[R_TIM_CTRL] & TIMER_CTRL_ENBL)) {
ptimer_stop(st->ptimer);
return;
}
count = st->regs[R_TIM_LOADVAL];
ptimer_set_limit(st->ptimer, count, 1);
ptimer_run(st->ptimer, 1);
}
static uint64_t
timer_read(void *opaque, hwaddr offset, unsigned int size)
{
MSSTimerState *t = opaque;
hwaddr addr;
struct Msf2Timer *st;
uint32_t ret = 0;
int timer = 0;
int isr;
int ier;
addr = offset >> 2;
/*
* Two independent timers has same base address.
* Based on address passed figure out which timer is being used.
*/
if ((addr >= R_TIM1_MAX) && (addr < NUM_TIMERS * R_TIM1_MAX)) {
timer = 1;
addr -= R_TIM1_MAX;
}
st = &t->timers[timer];
switch (addr) {
case R_TIM_VAL:
ret = ptimer_get_count(st->ptimer);
break;
case R_TIM_MIS:
isr = !!(st->regs[R_TIM_RIS] & TIMER_RIS_ACK);
ier = !!(st->regs[R_TIM_CTRL] & TIMER_CTRL_INTR);
ret = ier & isr;
break;
default:
if (addr < R_TIM1_MAX) {
ret = st->regs[addr];
} else {
qemu_log_mask(LOG_GUEST_ERROR,
TYPE_MSS_TIMER": 64-bit mode not supported\n");
return ret;
}
break;
}
DB_PRINT("timer=%d 0x%" HWADDR_PRIx "=0x%" PRIx32, timer, offset,
ret);
return ret;
}
static void
timer_write(void *opaque, hwaddr offset,
uint64_t val64, unsigned int size)
{
MSSTimerState *t = opaque;
hwaddr addr;
struct Msf2Timer *st;
int timer = 0;
uint32_t value = val64;
addr = offset >> 2;
/*
* Two independent timers has same base address.
* Based on addr passed figure out which timer is being used.
*/
if ((addr >= R_TIM1_MAX) && (addr < NUM_TIMERS * R_TIM1_MAX)) {
timer = 1;
addr -= R_TIM1_MAX;
}
st = &t->timers[timer];
DB_PRINT("addr=0x%" HWADDR_PRIx " val=0x%" PRIx32 " (timer=%d)", offset,
value, timer);
switch (addr) {
case R_TIM_CTRL:
st->regs[R_TIM_CTRL] = value;
ptimer_transaction_begin(st->ptimer);
timer_update(st);
ptimer_transaction_commit(st->ptimer);
break;
case R_TIM_RIS:
if (value & TIMER_RIS_ACK) {
st->regs[R_TIM_RIS] &= ~TIMER_RIS_ACK;
}
break;
case R_TIM_LOADVAL:
st->regs[R_TIM_LOADVAL] = value;
if (st->regs[R_TIM_CTRL] & TIMER_CTRL_ENBL) {
ptimer_transaction_begin(st->ptimer);
timer_update(st);
ptimer_transaction_commit(st->ptimer);
}
break;
case R_TIM_BGLOADVAL:
st->regs[R_TIM_BGLOADVAL] = value;
st->regs[R_TIM_LOADVAL] = value;
break;
case R_TIM_VAL:
case R_TIM_MIS:
break;
default:
if (addr < R_TIM1_MAX) {
st->regs[addr] = value;
} else {
qemu_log_mask(LOG_GUEST_ERROR,
TYPE_MSS_TIMER": 64-bit mode not supported\n");
return;
}
break;
}
timer_update_irq(st);
}
static const MemoryRegionOps timer_ops = {
.read = timer_read,
.write = timer_write,
.endianness = DEVICE_NATIVE_ENDIAN,
.valid = {
.min_access_size = 1,
.max_access_size = 4
}
};
static void timer_hit(void *opaque)
{
struct Msf2Timer *st = opaque;
st->regs[R_TIM_RIS] |= TIMER_RIS_ACK;
if (!(st->regs[R_TIM_CTRL] & TIMER_CTRL_ONESHOT)) {
timer_update(st);
}
timer_update_irq(st);
}
static void mss_timer_init(Object *obj)
{
MSSTimerState *t = MSS_TIMER(obj);
int i;
/* Init all the ptimers. */
for (i = 0; i < NUM_TIMERS; i++) {
struct Msf2Timer *st = &t->timers[i];
st->ptimer = ptimer_init(timer_hit, st, PTIMER_POLICY_DEFAULT);
ptimer_transaction_begin(st->ptimer);
ptimer_set_freq(st->ptimer, t->freq_hz);
ptimer_transaction_commit(st->ptimer);
sysbus_init_irq(SYS_BUS_DEVICE(obj), &st->irq);
}
memory_region_init_io(&t->mmio, OBJECT(t), &timer_ops, t, TYPE_MSS_TIMER,
NUM_TIMERS * R_TIM1_MAX * 4);
sysbus_init_mmio(SYS_BUS_DEVICE(obj), &t->mmio);
}
static const VMStateDescription vmstate_timers = {
.name = "mss-timer-block",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_PTIMER(ptimer, struct Msf2Timer),
VMSTATE_UINT32_ARRAY(regs, struct Msf2Timer, R_TIM1_MAX),
VMSTATE_END_OF_LIST()
}
};
static const VMStateDescription vmstate_mss_timer = {
.name = TYPE_MSS_TIMER,
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(freq_hz, MSSTimerState),
VMSTATE_STRUCT_ARRAY(timers, MSSTimerState, NUM_TIMERS, 0,
vmstate_timers, struct Msf2Timer),
VMSTATE_END_OF_LIST()
}
};
static Property mss_timer_properties[] = {
/* Libero GUI shows 100Mhz as default for clocks */
DEFINE_PROP_UINT32("clock-frequency", MSSTimerState, freq_hz,
100 * 1000000),
DEFINE_PROP_END_OF_LIST(),
};
static void mss_timer_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->props = mss_timer_properties;
dc->vmsd = &vmstate_mss_timer;
}
static const TypeInfo mss_timer_info = {
.name = TYPE_MSS_TIMER,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(MSSTimerState),
.instance_init = mss_timer_init,
.class_init = mss_timer_class_init,
};
static void mss_timer_register_types(void)
{
type_register_static(&mss_timer_info);
}
type_init(mss_timer_register_types)
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