| /* |
| * 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 = (const 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 const Property rcmt_properties[] = { |
| DEFINE_PROP_UINT64("input-freq", RCMTState, input_freq, 0), |
| }; |
| |
| static void rcmt_class_init(ObjectClass *klass, const void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| |
| dc->vmsd = &vmstate_rcmt; |
| device_class_set_legacy_reset(dc, 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) |
