/*
* Renesas 16bit Compare-match timer
*
* Datasheet: RX62N Group, RX621 Group User's Manual: Hardware
* (Rev.1.40 R01UH0033EJ0140)
*
* Copyright (c) 2019 Yoshinori Sato
*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "hw/irq.h"
#include "hw/registerfields.h"
#include "hw/qdev-properties.h"
#include "hw/timer/renesas_cmt.h"
#include "migration/vmstate.h"
/*
* +0 CMSTR - common control
* +2 CMCR - ch0
* +4 CMCNT - ch0
* +6 CMCOR - ch0
* +8 CMCR - ch1
* +10 CMCNT - ch1
* +12 CMCOR - ch1
* If we think that the address of CH 0 has an offset of +2,
* we can treat it with the same address as CH 1, so define it like that.
*/
REG16(CMSTR, 0)
FIELD(CMSTR, STR0, 0, 1)
FIELD(CMSTR, STR1, 1, 1)
FIELD(CMSTR, STR, 0, 2)
/* This addeess is channel offset */
REG16(CMCR, 0)
FIELD(CMCR, CKS, 0, 2)
FIELD(CMCR, CMIE, 6, 1)
REG16(CMCNT, 2)
REG16(CMCOR, 4)
static void update_events(RCMTState *cmt, int ch)
{
int64_t next_time;
if ((cmt->cmstr & (1 << ch)) == 0) {
/* count disable, so not happened next event. */
return;
}
next_time = cmt->cmcor[ch] - cmt->cmcnt[ch];
next_time *= NANOSECONDS_PER_SECOND;
next_time /= cmt->input_freq;
/*
* CKS -> div rate
* 0 -> 8 (1 << 3)
* 1 -> 32 (1 << 5)
* 2 -> 128 (1 << 7)
* 3 -> 512 (1 << 9)
*/
next_time *= 1 << (3 + FIELD_EX16(cmt->cmcr[ch], CMCR, CKS) * 2);
next_time += qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
timer_mod(&cmt->timer[ch], next_time);
}
static int64_t read_cmcnt(RCMTState *cmt, int ch)
{
int64_t delta, now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
if (cmt->cmstr & (1 << ch)) {
delta = (now - cmt->tick[ch]);
delta /= NANOSECONDS_PER_SECOND;
delta /= cmt->input_freq;
delta /= 1 << (3 + FIELD_EX16(cmt->cmcr[ch], CMCR, CKS) * 2);
cmt->tick[ch] = now;
return cmt->cmcnt[ch] + delta;
} else {
return cmt->cmcnt[ch];
}
}
static uint64_t cmt_read(void *opaque, hwaddr offset, unsigned size)
{
RCMTState *cmt = opaque;
int ch = offset / 0x08;
uint64_t ret;
if (offset == A_CMSTR) {
ret = 0;
ret = FIELD_DP16(ret, CMSTR, STR,
FIELD_EX16(cmt->cmstr, CMSTR, STR));
return ret;
} else {
offset &= 0x07;
if (ch == 0) {
offset -= 0x02;
}
switch (offset) {
case A_CMCR:
ret = 0;
ret = FIELD_DP16(ret, CMCR, CKS,
FIELD_EX16(cmt->cmstr, CMCR, CKS));
ret = FIELD_DP16(ret, CMCR, CMIE,
FIELD_EX16(cmt->cmstr, CMCR, CMIE));
return ret;
case A_CMCNT:
return read_cmcnt(cmt, ch);
case A_CMCOR:
return cmt->cmcor[ch];
}
}
qemu_log_mask(LOG_UNIMP, "renesas_cmt: Register 0x%" HWADDR_PRIX " "
"not implemented\n",
offset);
return UINT64_MAX;
}
static void start_stop(RCMTState *cmt, int ch, int st)
{
if (st) {
update_events(cmt, ch);
} else {
timer_del(&cmt->timer[ch]);
}
}
static void cmt_write(void *opaque, hwaddr offset, uint64_t val, unsigned size)
{
RCMTState *cmt = opaque;
int ch = offset / 0x08;
if (offset == A_CMSTR) {
cmt->cmstr = FIELD_EX16(val, CMSTR, STR);
start_stop(cmt, 0, FIELD_EX16(cmt->cmstr, CMSTR, STR0));
start_stop(cmt, 1, FIELD_EX16(cmt->cmstr, CMSTR, STR1));
} else {
offset &= 0x07;
if (ch == 0) {
offset -= 0x02;
}
switch (offset) {
case A_CMCR:
cmt->cmcr[ch] = FIELD_DP16(cmt->cmcr[ch], CMCR, CKS,
FIELD_EX16(val, CMCR, CKS));
cmt->cmcr[ch] = FIELD_DP16(cmt->cmcr[ch], CMCR, CMIE,
FIELD_EX16(val, CMCR, CMIE));
break;
case 2:
cmt->cmcnt[ch] = val;
break;
case 4:
cmt->cmcor[ch] = val;
break;
default:
qemu_log_mask(LOG_UNIMP, "renesas_cmt: Register 0x%" HWADDR_PRIX " "
"not implemented\n",
offset);
return;
}
if (FIELD_EX16(cmt->cmstr, CMSTR, STR) & (1 << ch)) {
update_events(cmt, ch);
}
}
}
static const MemoryRegionOps cmt_ops = {
.write = cmt_write,
.read = cmt_read,
.endianness = DEVICE_NATIVE_ENDIAN,
.impl = {
.min_access_size = 2,
.max_access_size = 2,
},
.valid = {
.min_access_size = 2,
.max_access_size = 2,
},
};
static void timer_events(RCMTState *cmt, int ch)
{
cmt->cmcnt[ch] = 0;
cmt->tick[ch] = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
update_events(cmt, ch);
if (FIELD_EX16(cmt->cmcr[ch], CMCR, CMIE)) {
qemu_irq_pulse(cmt->cmi[ch]);
}
}
static void timer_event0(void *opaque)
{
RCMTState *cmt = opaque;
timer_events(cmt, 0);
}
static void timer_event1(void *opaque)
{
RCMTState *cmt = opaque;
timer_events(cmt, 1);
}
static void rcmt_reset(DeviceState *dev)
{
RCMTState *cmt = RCMT(dev);
cmt->cmstr = 0;
cmt->cmcr[0] = cmt->cmcr[1] = 0;
cmt->cmcnt[0] = cmt->cmcnt[1] = 0;
cmt->cmcor[0] = cmt->cmcor[1] = 0xffff;
}
static void rcmt_init(Object *obj)
{
SysBusDevice *d = SYS_BUS_DEVICE(obj);
RCMTState *cmt = RCMT(obj);
int i;
memory_region_init_io(&cmt->memory, OBJECT(cmt), &cmt_ops,
cmt, "renesas-cmt", 0x10);
sysbus_init_mmio(d, &cmt->memory);
for (i = 0; i < ARRAY_SIZE(cmt->cmi); i++) {
sysbus_init_irq(d, &cmt->cmi[i]);
}
timer_init_ns(&cmt->timer[0], QEMU_CLOCK_VIRTUAL, timer_event0, cmt);
timer_init_ns(&cmt->timer[1], QEMU_CLOCK_VIRTUAL, timer_event1, cmt);
}
static const VMStateDescription vmstate_rcmt = {
.name = "rx-cmt",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT16(cmstr, RCMTState),
VMSTATE_UINT16_ARRAY(cmcr, RCMTState, CMT_CH),
VMSTATE_UINT16_ARRAY(cmcnt, RCMTState, CMT_CH),
VMSTATE_UINT16_ARRAY(cmcor, RCMTState, CMT_CH),
VMSTATE_INT64_ARRAY(tick, RCMTState, CMT_CH),
VMSTATE_TIMER_ARRAY(timer, RCMTState, CMT_CH),
VMSTATE_END_OF_LIST()
}
};
static Property rcmt_properties[] = {
DEFINE_PROP_UINT64("input-freq", RCMTState, input_freq, 0),
DEFINE_PROP_END_OF_LIST(),
};
static void rcmt_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->vmsd = &vmstate_rcmt;
dc->reset = rcmt_reset;
device_class_set_props(dc, rcmt_properties);
}
static const TypeInfo rcmt_info = {
.name = TYPE_RENESAS_CMT,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(RCMTState),
.instance_init = rcmt_init,
.class_init = rcmt_class_init,
};
static void rcmt_register_types(void)
{
type_register_static(&rcmt_info);
}
type_init(rcmt_register_types)
