#include "qemu/osdep.h"
#include "hw/char/serial.h"
+#include "hw/irq.h"
+#include "migration/vmstate.h"
#include "chardev/char-serial.h"
#include "qapi/error.h"
#include "qemu/timer.h"
+#include "sysemu/reset.h"
+#include "sysemu/runstate.h"
#include "qemu/error-report.h"
+#include "trace.h"
//#define DEBUG_SERIAL
static void serial_update_parameters(SerialState *s)
{
- int speed, parity, data_bits, stop_bits, frame_size;
+ float speed;
+ int parity, data_bits, stop_bits, frame_size;
QEMUSerialSetParams ssp;
- if (s->divider == 0 || s->divider > s->baudbase) {
- return;
- }
-
/* Start bit. */
frame_size = 1;
if (s->lcr & 0x08) {
} else {
parity = 'N';
}
- if (s->lcr & 0x04)
+ if (s->lcr & 0x04) {
stop_bits = 2;
- else
+ } else {
stop_bits = 1;
+ }
data_bits = (s->lcr & 0x03) + 5;
frame_size += data_bits + stop_bits;
- speed = s->baudbase / s->divider;
+ /* Zero divisor should give about 3500 baud */
+ speed = (s->divider == 0) ? 3500 : (float) s->baudbase / s->divider;
ssp.speed = speed;
ssp.parity = parity;
ssp.data_bits = data_bits;
s->char_transmit_time = (NANOSECONDS_PER_SECOND / speed) * frame_size;
qemu_chr_fe_ioctl(&s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
- DPRINTF("speed=%d parity=%c data=%d stop=%d\n",
+ DPRINTF("speed=%.2f parity=%c data=%d stop=%d\n",
speed, parity, data_bits, stop_bits);
}
if (s->mcr & UART_MCR_LOOP) {
/* in loopback mode, say that we just received a char */
serial_receive1(s, &s->tsr, 1);
- } else if (qemu_chr_fe_write(&s->chr, &s->tsr, 1) != 1 &&
- s->tsr_retry < MAX_XMIT_RETRY) {
- assert(s->watch_tag == 0);
- s->watch_tag =
- qemu_chr_fe_add_watch(&s->chr, G_IO_OUT | G_IO_HUP,
- serial_watch_cb, s);
- if (s->watch_tag > 0) {
- s->tsr_retry++;
- return;
+ } else {
+ int rc = qemu_chr_fe_write(&s->chr, &s->tsr, 1);
+
+ if ((rc == 0 ||
+ (rc == -1 && errno == EAGAIN)) &&
+ s->tsr_retry < MAX_XMIT_RETRY) {
+ assert(s->watch_tag == 0);
+ s->watch_tag =
+ qemu_chr_fe_add_watch(&s->chr, G_IO_OUT | G_IO_HUP,
+ serial_watch_cb, s);
+ if (s->watch_tag > 0) {
+ s->tsr_retry++;
+ return;
+ }
}
}
s->tsr_retry = 0;
SerialState *s = opaque;
addr &= 7;
- DPRINTF("write addr=0x%" HWADDR_PRIx " val=0x%" PRIx64 "\n", addr, val);
+ trace_serial_ioport_write(addr, val);
switch(addr) {
default:
case 0:
if (s->lcr & UART_LCR_DLAB) {
- s->divider = (s->divider & 0xff00) | val;
+ if (size == 1) {
+ s->divider = (s->divider & 0xff00) | val;
+ } else {
+ s->divider = val;
+ }
serial_update_parameters(s);
} else {
s->thr = (uint8_t) val;
ret = s->scr;
break;
}
- DPRINTF("read addr=0x%" HWADDR_PRIx " val=0x%02x\n", addr, ret);
+ trace_serial_ioport_read(addr, ret);
return ret;
}
SerialState *s = opaque;
if (s->wakeup) {
- qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
+ qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, NULL);
}
if(s->fcr & UART_FCR_FE) {
int i;
serial_update_irq(s);
}
-static void serial_event(void *opaque, int event)
+static void serial_event(void *opaque, QEMUChrEvent event)
{
SerialState *s = opaque;
DPRINTF("event %x\n", event);