| /* |
| * Renesas Serial Communication Interface |
| * |
| * 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/qdev-properties-system.h" |
| #include "hw/char/renesas_sci.h" |
| #include "migration/vmstate.h" |
| |
| /* SCI register map */ |
| REG8(SMR, 0) |
| FIELD(SMR, CKS, 0, 2) |
| FIELD(SMR, MP, 2, 1) |
| FIELD(SMR, STOP, 3, 1) |
| FIELD(SMR, PM, 4, 1) |
| FIELD(SMR, PE, 5, 1) |
| FIELD(SMR, CHR, 6, 1) |
| FIELD(SMR, CM, 7, 1) |
| REG8(BRR, 1) |
| REG8(SCR, 2) |
| FIELD(SCR, CKE, 0, 2) |
| FIELD(SCR, TEIE, 2, 1) |
| FIELD(SCR, MPIE, 3, 1) |
| FIELD(SCR, RE, 4, 1) |
| FIELD(SCR, TE, 5, 1) |
| FIELD(SCR, RIE, 6, 1) |
| FIELD(SCR, TIE, 7, 1) |
| REG8(TDR, 3) |
| REG8(SSR, 4) |
| FIELD(SSR, MPBT, 0, 1) |
| FIELD(SSR, MPB, 1, 1) |
| FIELD(SSR, TEND, 2, 1) |
| FIELD(SSR, ERR, 3, 3) |
| FIELD(SSR, PER, 3, 1) |
| FIELD(SSR, FER, 4, 1) |
| FIELD(SSR, ORER, 5, 1) |
| FIELD(SSR, RDRF, 6, 1) |
| FIELD(SSR, TDRE, 7, 1) |
| REG8(RDR, 5) |
| REG8(SCMR, 6) |
| FIELD(SCMR, SMIF, 0, 1) |
| FIELD(SCMR, SINV, 2, 1) |
| FIELD(SCMR, SDIR, 3, 1) |
| FIELD(SCMR, BCP2, 7, 1) |
| REG8(SEMR, 7) |
| FIELD(SEMR, ACS0, 0, 1) |
| FIELD(SEMR, ABCS, 4, 1) |
| |
| static int can_receive(void *opaque) |
| { |
| RSCIState *sci = RSCI(opaque); |
| if (sci->rx_next > qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL)) { |
| return 0; |
| } else { |
| return FIELD_EX8(sci->scr, SCR, RE); |
| } |
| } |
| |
| static void receive(void *opaque, const uint8_t *buf, int size) |
| { |
| RSCIState *sci = RSCI(opaque); |
| sci->rx_next = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + sci->trtime; |
| if (FIELD_EX8(sci->ssr, SSR, RDRF) || size > 1) { |
| sci->ssr = FIELD_DP8(sci->ssr, SSR, ORER, 1); |
| if (FIELD_EX8(sci->scr, SCR, RIE)) { |
| qemu_set_irq(sci->irq[ERI], 1); |
| } |
| } else { |
| sci->rdr = buf[0]; |
| sci->ssr = FIELD_DP8(sci->ssr, SSR, RDRF, 1); |
| if (FIELD_EX8(sci->scr, SCR, RIE)) { |
| qemu_irq_pulse(sci->irq[RXI]); |
| } |
| } |
| } |
| |
| static void send_byte(RSCIState *sci) |
| { |
| if (qemu_chr_fe_backend_connected(&sci->chr)) { |
| qemu_chr_fe_write_all(&sci->chr, &sci->tdr, 1); |
| } |
| timer_mod(&sci->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + sci->trtime); |
| sci->ssr = FIELD_DP8(sci->ssr, SSR, TEND, 0); |
| sci->ssr = FIELD_DP8(sci->ssr, SSR, TDRE, 1); |
| qemu_set_irq(sci->irq[TEI], 0); |
| if (FIELD_EX8(sci->scr, SCR, TIE)) { |
| qemu_irq_pulse(sci->irq[TXI]); |
| } |
| } |
| |
| static void txend(void *opaque) |
| { |
| RSCIState *sci = RSCI(opaque); |
| if (!FIELD_EX8(sci->ssr, SSR, TDRE)) { |
| send_byte(sci); |
| } else { |
| sci->ssr = FIELD_DP8(sci->ssr, SSR, TEND, 1); |
| if (FIELD_EX8(sci->scr, SCR, TEIE)) { |
| qemu_set_irq(sci->irq[TEI], 1); |
| } |
| } |
| } |
| |
| static void update_trtime(RSCIState *sci) |
| { |
| /* char per bits */ |
| sci->trtime = 8 - FIELD_EX8(sci->smr, SMR, CHR); |
| sci->trtime += FIELD_EX8(sci->smr, SMR, PE); |
| sci->trtime += FIELD_EX8(sci->smr, SMR, STOP) + 1; |
| /* x bit transmit time (32 * divrate * brr) / base freq */ |
| sci->trtime *= 32 * sci->brr; |
| sci->trtime *= 1 << (2 * FIELD_EX8(sci->smr, SMR, CKS)); |
| sci->trtime *= NANOSECONDS_PER_SECOND; |
| sci->trtime /= sci->input_freq; |
| } |
| |
| static bool sci_is_tr_enabled(RSCIState *sci) |
| { |
| return FIELD_EX8(sci->scr, SCR, TE) || FIELD_EX8(sci->scr, SCR, RE); |
| } |
| |
| static void sci_write(void *opaque, hwaddr offset, uint64_t val, unsigned size) |
| { |
| RSCIState *sci = RSCI(opaque); |
| |
| switch (offset) { |
| case A_SMR: |
| if (!sci_is_tr_enabled(sci)) { |
| sci->smr = val; |
| update_trtime(sci); |
| } |
| break; |
| case A_BRR: |
| if (!sci_is_tr_enabled(sci)) { |
| sci->brr = val; |
| update_trtime(sci); |
| } |
| break; |
| case A_SCR: |
| sci->scr = val; |
| if (FIELD_EX8(sci->scr, SCR, TE)) { |
| sci->ssr = FIELD_DP8(sci->ssr, SSR, TDRE, 1); |
| sci->ssr = FIELD_DP8(sci->ssr, SSR, TEND, 1); |
| if (FIELD_EX8(sci->scr, SCR, TIE)) { |
| qemu_irq_pulse(sci->irq[TXI]); |
| } |
| } |
| if (!FIELD_EX8(sci->scr, SCR, TEIE)) { |
| qemu_set_irq(sci->irq[TEI], 0); |
| } |
| if (!FIELD_EX8(sci->scr, SCR, RIE)) { |
| qemu_set_irq(sci->irq[ERI], 0); |
| } |
| break; |
| case A_TDR: |
| sci->tdr = val; |
| if (FIELD_EX8(sci->ssr, SSR, TEND)) { |
| send_byte(sci); |
| } else { |
| sci->ssr = FIELD_DP8(sci->ssr, SSR, TDRE, 0); |
| } |
| break; |
| case A_SSR: |
| sci->ssr = FIELD_DP8(sci->ssr, SSR, MPBT, |
| FIELD_EX8(val, SSR, MPBT)); |
| sci->ssr = FIELD_DP8(sci->ssr, SSR, ERR, |
| FIELD_EX8(val, SSR, ERR) & 0x07); |
| if (FIELD_EX8(sci->read_ssr, SSR, ERR) && |
| FIELD_EX8(sci->ssr, SSR, ERR) == 0) { |
| qemu_set_irq(sci->irq[ERI], 0); |
| } |
| break; |
| case A_RDR: |
| qemu_log_mask(LOG_GUEST_ERROR, "reneas_sci: RDR is read only.\n"); |
| break; |
| case A_SCMR: |
| sci->scmr = val; break; |
| case A_SEMR: /* SEMR */ |
| sci->semr = val; break; |
| default: |
| qemu_log_mask(LOG_UNIMP, "renesas_sci: Register 0x%" HWADDR_PRIX " " |
| "not implemented\n", |
| offset); |
| } |
| } |
| |
| static uint64_t sci_read(void *opaque, hwaddr offset, unsigned size) |
| { |
| RSCIState *sci = RSCI(opaque); |
| |
| switch (offset) { |
| case A_SMR: |
| return sci->smr; |
| case A_BRR: |
| return sci->brr; |
| case A_SCR: |
| return sci->scr; |
| case A_TDR: |
| return sci->tdr; |
| case A_SSR: |
| sci->read_ssr = sci->ssr; |
| return sci->ssr; |
| case A_RDR: |
| sci->ssr = FIELD_DP8(sci->ssr, SSR, RDRF, 0); |
| return sci->rdr; |
| case A_SCMR: |
| return sci->scmr; |
| case A_SEMR: |
| return sci->semr; |
| default: |
| qemu_log_mask(LOG_UNIMP, "renesas_sci: Register 0x%" HWADDR_PRIX |
| " not implemented.\n", offset); |
| } |
| return UINT64_MAX; |
| } |
| |
| static const MemoryRegionOps sci_ops = { |
| .write = sci_write, |
| .read = sci_read, |
| .endianness = DEVICE_NATIVE_ENDIAN, |
| .impl.max_access_size = 1, |
| .valid.max_access_size = 1, |
| }; |
| |
| static void rsci_reset(DeviceState *dev) |
| { |
| RSCIState *sci = RSCI(dev); |
| sci->smr = sci->scr = 0x00; |
| sci->brr = 0xff; |
| sci->tdr = 0xff; |
| sci->rdr = 0x00; |
| sci->ssr = 0x84; |
| sci->scmr = 0x00; |
| sci->semr = 0x00; |
| sci->rx_next = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); |
| } |
| |
| static void sci_event(void *opaque, QEMUChrEvent event) |
| { |
| RSCIState *sci = RSCI(opaque); |
| if (event == CHR_EVENT_BREAK) { |
| sci->ssr = FIELD_DP8(sci->ssr, SSR, FER, 1); |
| if (FIELD_EX8(sci->scr, SCR, RIE)) { |
| qemu_set_irq(sci->irq[ERI], 1); |
| } |
| } |
| } |
| |
| static void rsci_realize(DeviceState *dev, Error **errp) |
| { |
| RSCIState *sci = RSCI(dev); |
| |
| if (sci->input_freq == 0) { |
| qemu_log_mask(LOG_GUEST_ERROR, |
| "renesas_sci: input-freq property must be set."); |
| return; |
| } |
| qemu_chr_fe_set_handlers(&sci->chr, can_receive, receive, |
| sci_event, NULL, sci, NULL, true); |
| } |
| |
| static void rsci_init(Object *obj) |
| { |
| SysBusDevice *d = SYS_BUS_DEVICE(obj); |
| RSCIState *sci = RSCI(obj); |
| int i; |
| |
| memory_region_init_io(&sci->memory, OBJECT(sci), &sci_ops, |
| sci, "renesas-sci", 0x8); |
| sysbus_init_mmio(d, &sci->memory); |
| |
| for (i = 0; i < SCI_NR_IRQ; i++) { |
| sysbus_init_irq(d, &sci->irq[i]); |
| } |
| timer_init_ns(&sci->timer, QEMU_CLOCK_VIRTUAL, txend, sci); |
| } |
| |
| static const VMStateDescription vmstate_rsci = { |
| .name = "renesas-sci", |
| .version_id = 1, |
| .minimum_version_id = 1, |
| .fields = (const VMStateField[]) { |
| VMSTATE_INT64(trtime, RSCIState), |
| VMSTATE_INT64(rx_next, RSCIState), |
| VMSTATE_UINT8(smr, RSCIState), |
| VMSTATE_UINT8(brr, RSCIState), |
| VMSTATE_UINT8(scr, RSCIState), |
| VMSTATE_UINT8(tdr, RSCIState), |
| VMSTATE_UINT8(ssr, RSCIState), |
| VMSTATE_UINT8(rdr, RSCIState), |
| VMSTATE_UINT8(scmr, RSCIState), |
| VMSTATE_UINT8(semr, RSCIState), |
| VMSTATE_UINT8(read_ssr, RSCIState), |
| VMSTATE_TIMER(timer, RSCIState), |
| VMSTATE_END_OF_LIST() |
| } |
| }; |
| |
| static const Property rsci_properties[] = { |
| DEFINE_PROP_UINT64("input-freq", RSCIState, input_freq, 0), |
| DEFINE_PROP_CHR("chardev", RSCIState, chr), |
| }; |
| |
| static void rsci_class_init(ObjectClass *klass, const void *data) |
| { |
| DeviceClass *dc = DEVICE_CLASS(klass); |
| |
| dc->realize = rsci_realize; |
| dc->vmsd = &vmstate_rsci; |
| device_class_set_legacy_reset(dc, rsci_reset); |
| device_class_set_props(dc, rsci_properties); |
| } |
| |
| static const TypeInfo rsci_info = { |
| .name = TYPE_RENESAS_SCI, |
| .parent = TYPE_SYS_BUS_DEVICE, |
| .instance_size = sizeof(RSCIState), |
| .instance_init = rsci_init, |
| .class_init = rsci_class_init, |
| }; |
| |
| static void rsci_register_types(void) |
| { |
| type_register_static(&rsci_info); |
| } |
| |
| type_init(rsci_register_types) |
