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qemu/hw/char/sh_serial.c
BALATON Zoltan 44ae04f032 hw/char/sh_serial: Add device id to trace output 
Normally there are at least two sh_serial instances. Add device id to
trace messages to make it clear which instance they belong to
otherwise its not possible to tell which serial device is accessed.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <cc1f9ff9f4259ae799750e452f8871849c7a104c.1635541329.git.balaton@eik.bme.hu>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
2021-10-30 18:39:37 +02:00

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/*
* QEMU SCI/SCIF serial port emulation
*
* Copyright (c) 2007 Magnus Damm
*
* Based on serial.c - QEMU 16450 UART 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/sysbus.h"
#include "hw/irq.h"
#include "hw/qdev-core.h"
#include "hw/qdev-properties.h"
#include "hw/qdev-properties-system.h"
#include "hw/sh4/sh.h"
#include "chardev/char-fe.h"
#include "qapi/error.h"
#include "qemu/timer.h"
#include "qemu/log.h"
#include "trace.h"
#define SH_SERIAL_FLAG_TEND (1 << 0)
#define SH_SERIAL_FLAG_TDE (1 << 1)
#define SH_SERIAL_FLAG_RDF (1 << 2)
#define SH_SERIAL_FLAG_BRK (1 << 3)
#define SH_SERIAL_FLAG_DR (1 << 4)
#define SH_RX_FIFO_LENGTH (16)
OBJECT_DECLARE_SIMPLE_TYPE(SHSerialState, SH_SERIAL)
struct SHSerialState {
SysBusDevice parent;
uint8_t smr;
uint8_t brr;
uint8_t scr;
uint8_t dr; /* ftdr / tdr */
uint8_t sr; /* fsr / ssr */
uint16_t fcr;
uint8_t sptr;
uint8_t rx_fifo[SH_RX_FIFO_LENGTH]; /* frdr / rdr */
uint8_t rx_cnt;
uint8_t rx_tail;
uint8_t rx_head;
uint8_t feat;
int flags;
int rtrg;
CharBackend chr;
QEMUTimer fifo_timeout_timer;
uint64_t etu; /* Elementary Time Unit (ns) */
qemu_irq eri;
qemu_irq rxi;
qemu_irq txi;
qemu_irq tei;
qemu_irq bri;
};
typedef struct {} SHSerialStateClass;
OBJECT_DEFINE_TYPE(SHSerialState, sh_serial, SH_SERIAL, SYS_BUS_DEVICE)
static void sh_serial_clear_fifo(SHSerialState *s)
{
memset(s->rx_fifo, 0, SH_RX_FIFO_LENGTH);
s->rx_cnt = 0;
s->rx_head = 0;
s->rx_tail = 0;
}
static void sh_serial_write(void *opaque, hwaddr offs,
uint64_t val, unsigned size)
{
SHSerialState *s = opaque;
DeviceState *d = DEVICE(s);
unsigned char ch;
trace_sh_serial_write(d->id, size, offs, val);
switch (offs) {
case 0x00: /* SMR */
s->smr = val & ((s->feat & SH_SERIAL_FEAT_SCIF) ? 0x7b : 0xff);
return;
case 0x04: /* BRR */
s->brr = val;
return;
case 0x08: /* SCR */
/* TODO : For SH7751, SCIF mask should be 0xfb. */
s->scr = val & ((s->feat & SH_SERIAL_FEAT_SCIF) ? 0xfa : 0xff);
if (!(val & (1 << 5))) {
s->flags |= SH_SERIAL_FLAG_TEND;
}
if ((s->feat & SH_SERIAL_FEAT_SCIF) && s->txi) {
qemu_set_irq(s->txi, val & (1 << 7));
}
if (!(val & (1 << 6))) {
qemu_set_irq(s->rxi, 0);
}
return;
case 0x0c: /* FTDR / TDR */
if (qemu_chr_fe_backend_connected(&s->chr)) {
ch = val;
/*
* XXX this blocks entire thread. Rewrite to use
* qemu_chr_fe_write and background I/O callbacks
*/
qemu_chr_fe_write_all(&s->chr, &ch, 1);
}
s->dr = val;
s->flags &= ~SH_SERIAL_FLAG_TDE;
return;
#if 0
case 0x14: /* FRDR / RDR */
ret = 0;
break;
#endif
}
if (s->feat & SH_SERIAL_FEAT_SCIF) {
switch (offs) {
case 0x10: /* FSR */
if (!(val & (1 << 6))) {
s->flags &= ~SH_SERIAL_FLAG_TEND;
}
if (!(val & (1 << 5))) {
s->flags &= ~SH_SERIAL_FLAG_TDE;
}
if (!(val & (1 << 4))) {
s->flags &= ~SH_SERIAL_FLAG_BRK;
}
if (!(val & (1 << 1))) {
s->flags &= ~SH_SERIAL_FLAG_RDF;
}
if (!(val & (1 << 0))) {
s->flags &= ~SH_SERIAL_FLAG_DR;
}
if (!(val & (1 << 1)) || !(val & (1 << 0))) {
if (s->rxi) {
qemu_set_irq(s->rxi, 0);
}
}
return;
case 0x18: /* FCR */
s->fcr = val;
switch ((val >> 6) & 3) {
case 0:
s->rtrg = 1;
break;
case 1:
s->rtrg = 4;
break;
case 2:
s->rtrg = 8;
break;
case 3:
s->rtrg = 14;
break;
}
if (val & (1 << 1)) {
sh_serial_clear_fifo(s);
s->sr &= ~(1 << 1);
}
return;
case 0x20: /* SPTR */
s->sptr = val & 0xf3;
return;
case 0x24: /* LSR */
return;
}
} else {
switch (offs) {
#if 0
case 0x0c:
ret = s->dr;
break;
case 0x10:
ret = 0;
break;
#endif
case 0x1c:
s->sptr = val & 0x8f;
return;
}
}
qemu_log_mask(LOG_GUEST_ERROR,
"%s: unsupported write to 0x%02" HWADDR_PRIx "\n",
__func__, offs);
}
static uint64_t sh_serial_read(void *opaque, hwaddr offs,
unsigned size)
{
SHSerialState *s = opaque;
DeviceState *d = DEVICE(s);
uint32_t ret = UINT32_MAX;
#if 0
switch (offs) {
case 0x00:
ret = s->smr;
break;
case 0x04:
ret = s->brr;
break;
case 0x08:
ret = s->scr;
break;
case 0x14:
ret = 0;
break;
}
#endif
if (s->feat & SH_SERIAL_FEAT_SCIF) {
switch (offs) {
case 0x00: /* SMR */
ret = s->smr;
break;
case 0x08: /* SCR */
ret = s->scr;
break;
case 0x10: /* FSR */
ret = 0;
if (s->flags & SH_SERIAL_FLAG_TEND) {
ret |= (1 << 6);
}
if (s->flags & SH_SERIAL_FLAG_TDE) {
ret |= (1 << 5);
}
if (s->flags & SH_SERIAL_FLAG_BRK) {
ret |= (1 << 4);
}
if (s->flags & SH_SERIAL_FLAG_RDF) {
ret |= (1 << 1);
}
if (s->flags & SH_SERIAL_FLAG_DR) {
ret |= (1 << 0);
}
if (s->scr & (1 << 5)) {
s->flags |= SH_SERIAL_FLAG_TDE | SH_SERIAL_FLAG_TEND;
}
break;
case 0x14:
if (s->rx_cnt > 0) {
ret = s->rx_fifo[s->rx_tail++];
s->rx_cnt--;
if (s->rx_tail == SH_RX_FIFO_LENGTH) {
s->rx_tail = 0;
}
if (s->rx_cnt < s->rtrg) {
s->flags &= ~SH_SERIAL_FLAG_RDF;
}
}
break;
case 0x18:
ret = s->fcr;
break;
case 0x1c:
ret = s->rx_cnt;
break;
case 0x20:
ret = s->sptr;
break;
case 0x24:
ret = 0;
break;
}
} else {
switch (offs) {
#if 0
case 0x0c:
ret = s->dr;
break;
case 0x10:
ret = 0;
break;
case 0x14:
ret = s->rx_fifo[0];
break;
#endif
case 0x1c:
ret = s->sptr;
break;
}
}
trace_sh_serial_read(d->id, size, offs, ret);
if (ret > UINT16_MAX) {
qemu_log_mask(LOG_GUEST_ERROR,
"%s: unsupported read from 0x%02" HWADDR_PRIx "\n",
__func__, offs);
ret = 0;
}
return ret;
}
static int sh_serial_can_receive(SHSerialState *s)
{
return s->scr & (1 << 4);
}
static void sh_serial_receive_break(SHSerialState *s)
{
if (s->feat & SH_SERIAL_FEAT_SCIF) {
s->sr |= (1 << 4);
}
}
static int sh_serial_can_receive1(void *opaque)
{
SHSerialState *s = opaque;
return sh_serial_can_receive(s);
}
static void sh_serial_timeout_int(void *opaque)
{
SHSerialState *s = opaque;
s->flags |= SH_SERIAL_FLAG_RDF;
if (s->scr & (1 << 6) && s->rxi) {
qemu_set_irq(s->rxi, 1);
}
}
static void sh_serial_receive1(void *opaque, const uint8_t *buf, int size)
{
SHSerialState *s = opaque;
if (s->feat & SH_SERIAL_FEAT_SCIF) {
int i;
for (i = 0; i < size; i++) {
if (s->rx_cnt < SH_RX_FIFO_LENGTH) {
s->rx_fifo[s->rx_head++] = buf[i];
if (s->rx_head == SH_RX_FIFO_LENGTH) {
s->rx_head = 0;
}
s->rx_cnt++;
if (s->rx_cnt >= s->rtrg) {
s->flags |= SH_SERIAL_FLAG_RDF;
if (s->scr & (1 << 6) && s->rxi) {
timer_del(&s->fifo_timeout_timer);
qemu_set_irq(s->rxi, 1);
}
} else {
timer_mod(&s->fifo_timeout_timer,
qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + 15 * s->etu);
}
}
}
} else {
s->rx_fifo[0] = buf[0];
}
}
static void sh_serial_event(void *opaque, QEMUChrEvent event)
{
SHSerialState *s = opaque;
if (event == CHR_EVENT_BREAK) {
sh_serial_receive_break(s);
}
}
static const MemoryRegionOps sh_serial_ops = {
.read = sh_serial_read,
.write = sh_serial_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static void sh_serial_reset(DeviceState *dev)
{
SHSerialState *s = SH_SERIAL(dev);
s->flags = SH_SERIAL_FLAG_TEND | SH_SERIAL_FLAG_TDE;
s->rtrg = 1;
s->smr = 0;
s->brr = 0xff;
s->scr = 1 << 5; /* pretend that TX is enabled so early printk works */
s->sptr = 0;
if (s->feat & SH_SERIAL_FEAT_SCIF) {
s->fcr = 0;
} else {
s->dr = 0xff;
}
sh_serial_clear_fifo(s);
}
static void sh_serial_realize(DeviceState *d, Error **errp)
{
SHSerialState *s = SH_SERIAL(d);
MemoryRegion *iomem = g_malloc(sizeof(*iomem));
assert(d->id);
memory_region_init_io(iomem, OBJECT(d), &sh_serial_ops, s, d->id, 0x28);
sysbus_init_mmio(SYS_BUS_DEVICE(d), iomem);
qdev_init_gpio_out_named(d, &s->eri, "eri", 1);
qdev_init_gpio_out_named(d, &s->rxi, "rxi", 1);
qdev_init_gpio_out_named(d, &s->txi, "txi", 1);
qdev_init_gpio_out_named(d, &s->tei, "tei", 1);
qdev_init_gpio_out_named(d, &s->bri, "bri", 1);
if (qemu_chr_fe_backend_connected(&s->chr)) {
qemu_chr_fe_set_handlers(&s->chr, sh_serial_can_receive1,
sh_serial_receive1,
sh_serial_event, NULL, s, NULL, true);
}
timer_init_ns(&s->fifo_timeout_timer, QEMU_CLOCK_VIRTUAL,
sh_serial_timeout_int, s);
s->etu = NANOSECONDS_PER_SECOND / 9600;
}
static void sh_serial_finalize(Object *obj)
{
SHSerialState *s = SH_SERIAL(obj);
timer_del(&s->fifo_timeout_timer);
}
static void sh_serial_init(Object *obj)
{
}
static Property sh_serial_properties[] = {
DEFINE_PROP_CHR("chardev", SHSerialState, chr),
DEFINE_PROP_UINT8("features", SHSerialState, feat, 0),
DEFINE_PROP_END_OF_LIST()
};
static void sh_serial_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
device_class_set_props(dc, sh_serial_properties);
dc->realize = sh_serial_realize;
dc->reset = sh_serial_reset;
/* Reason: part of SuperH CPU/SoC, needs to be wired up */
dc->user_creatable = false;
}
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