/*
- * QEMU 16450 UART emulation
- *
+ * QEMU 16550A UART emulation
+ *
* Copyright (c) 2003-2004 Fabrice Bellard
- *
+ * Copyright (c) 2008 Citrix Systems, Inc.
+ *
* 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
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
-#include <stdlib.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <string.h>
-#include <getopt.h>
-#include <inttypes.h>
-#include <unistd.h>
-#include <sys/mman.h>
-#include <fcntl.h>
-#include <signal.h>
-#include <time.h>
-#include <sys/time.h>
-#include <malloc.h>
-#include <termios.h>
-#include <sys/poll.h>
-#include <errno.h>
-#include <sys/wait.h>
-#include <netinet/in.h>
-
-#include "cpu.h"
-#include "vl.h"
+#include "hw.h"
+#include "qemu-char.h"
+#include "isa.h"
+#include "pc.h"
+#include "qemu-timer.h"
+#include "sysemu.h"
//#define DEBUG_SERIAL
#define UART_IIR_THRI 0x02 /* Transmitter holding register empty */
#define UART_IIR_RDI 0x04 /* Receiver data interrupt */
#define UART_IIR_RLSI 0x06 /* Receiver line status interrupt */
+#define UART_IIR_CTI 0x0C /* Character Timeout Indication */
+
+#define UART_IIR_FENF 0x80 /* Fifo enabled, but not functionning */
+#define UART_IIR_FE 0xC0 /* Fifo enabled */
/*
* These are the definitions for the Modem Control Register
#define UART_LSR_PE 0x04 /* Parity error indicator */
#define UART_LSR_OE 0x02 /* Overrun error indicator */
#define UART_LSR_DR 0x01 /* Receiver data ready */
+#define UART_LSR_INT_ANY 0x1E /* Any of the lsr-interrupt-triggering status bits */
+
+/* Interrupt trigger levels. The byte-counts are for 16550A - in newer UARTs the byte-count for each ITL is higher. */
+
+#define UART_FCR_ITL_1 0x00 /* 1 byte ITL */
+#define UART_FCR_ITL_2 0x40 /* 4 bytes ITL */
+#define UART_FCR_ITL_3 0x80 /* 8 bytes ITL */
+#define UART_FCR_ITL_4 0xC0 /* 14 bytes ITL */
+
+#define UART_FCR_DMS 0x08 /* DMA Mode Select */
+#define UART_FCR_XFR 0x04 /* XMIT Fifo Reset */
+#define UART_FCR_RFR 0x02 /* RCVR Fifo Reset */
+#define UART_FCR_FE 0x01 /* FIFO Enable */
+
+#define UART_FIFO_LENGTH 16 /* 16550A Fifo Length */
+
+#define XMIT_FIFO 0
+#define RECV_FIFO 1
+#define MAX_XMIT_RETRY 4
+
+#ifdef DEBUG_SERIAL
+#define DPRINTF(fmt, ...) \
+do { fprintf(stderr, "serial: " fmt , ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) \
+do {} while (0)
+#endif
+
+typedef struct SerialFIFO {
+ uint8_t data[UART_FIFO_LENGTH];
+ uint8_t count;
+ uint8_t itl; /* Interrupt Trigger Level */
+ uint8_t tail;
+ uint8_t head;
+} SerialFIFO;
struct SerialState {
- uint8_t divider;
+ uint16_t divider;
uint8_t rbr; /* receive register */
+ uint8_t thr; /* transmit holding register */
+ uint8_t tsr; /* transmit shift register */
uint8_t ier;
uint8_t iir; /* read only */
uint8_t lcr;
uint8_t mcr;
uint8_t lsr; /* read only */
- uint8_t msr;
+ uint8_t msr; /* read only */
uint8_t scr;
+ uint8_t fcr;
+ uint8_t fcr_vmstate; /* we can't write directly this value
+ it has side effects */
/* NOTE: this hidden state is necessary for tx irq generation as
it can be reset while reading iir */
int thr_ipending;
- int irq;
- int out_fd;
+ qemu_irq irq;
+ CharDriverState *chr;
+ int last_break_enable;
+ int it_shift;
+ int baudbase;
+ int tsr_retry;
+
+ uint64_t last_xmit_ts; /* Time when the last byte was successfully sent out of the tsr */
+ SerialFIFO recv_fifo;
+ SerialFIFO xmit_fifo;
+
+ struct QEMUTimer *fifo_timeout_timer;
+ int timeout_ipending; /* timeout interrupt pending state */
+ struct QEMUTimer *transmit_timer;
+
+
+ uint64_t char_transmit_time; /* time to transmit a char in ticks*/
+ int poll_msl;
+
+ struct QEMUTimer *modem_status_poll;
};
+typedef struct ISASerialState {
+ ISADevice dev;
+ uint32_t index;
+ uint32_t iobase;
+ uint32_t isairq;
+ SerialState state;
+} ISASerialState;
+
+static void serial_receive1(void *opaque, const uint8_t *buf, int size);
+
+static void fifo_clear(SerialState *s, int fifo)
+{
+ SerialFIFO *f = (fifo) ? &s->recv_fifo : &s->xmit_fifo;
+ memset(f->data, 0, UART_FIFO_LENGTH);
+ f->count = 0;
+ f->head = 0;
+ f->tail = 0;
+}
+
+static int fifo_put(SerialState *s, int fifo, uint8_t chr)
+{
+ SerialFIFO *f = (fifo) ? &s->recv_fifo : &s->xmit_fifo;
+
+ /* Receive overruns do not overwrite FIFO contents. */
+ if (fifo == XMIT_FIFO || f->count < UART_FIFO_LENGTH) {
+
+ f->data[f->head++] = chr;
+
+ if (f->head == UART_FIFO_LENGTH)
+ f->head = 0;
+ }
+
+ if (f->count < UART_FIFO_LENGTH)
+ f->count++;
+ else if (fifo == RECV_FIFO)
+ s->lsr |= UART_LSR_OE;
+
+ return 1;
+}
+
+static uint8_t fifo_get(SerialState *s, int fifo)
+{
+ SerialFIFO *f = (fifo) ? &s->recv_fifo : &s->xmit_fifo;
+ uint8_t c;
+
+ if(f->count == 0)
+ return 0;
+
+ c = f->data[f->tail++];
+ if (f->tail == UART_FIFO_LENGTH)
+ f->tail = 0;
+ f->count--;
+
+ return c;
+}
+
static void serial_update_irq(SerialState *s)
{
- if ((s->lsr & UART_LSR_DR) && (s->ier & UART_IER_RDI)) {
- s->iir = UART_IIR_RDI;
- } else if (s->thr_ipending && (s->ier & UART_IER_THRI)) {
- s->iir = UART_IIR_THRI;
+ uint8_t tmp_iir = UART_IIR_NO_INT;
+
+ if ((s->ier & UART_IER_RLSI) && (s->lsr & UART_LSR_INT_ANY)) {
+ tmp_iir = UART_IIR_RLSI;
+ } else if ((s->ier & UART_IER_RDI) && s->timeout_ipending) {
+ /* Note that(s->ier & UART_IER_RDI) can mask this interrupt,
+ * this is not in the specification but is observed on existing
+ * hardware. */
+ tmp_iir = UART_IIR_CTI;
+ } else if ((s->ier & UART_IER_RDI) && (s->lsr & UART_LSR_DR) &&
+ (!(s->fcr & UART_FCR_FE) ||
+ s->recv_fifo.count >= s->recv_fifo.itl)) {
+ tmp_iir = UART_IIR_RDI;
+ } else if ((s->ier & UART_IER_THRI) && s->thr_ipending) {
+ tmp_iir = UART_IIR_THRI;
+ } else if ((s->ier & UART_IER_MSI) && (s->msr & UART_MSR_ANY_DELTA)) {
+ tmp_iir = UART_IIR_MSI;
+ }
+
+ s->iir = tmp_iir | (s->iir & 0xF0);
+
+ if (tmp_iir != UART_IIR_NO_INT) {
+ qemu_irq_raise(s->irq);
} else {
- s->iir = UART_IIR_NO_INT;
+ qemu_irq_lower(s->irq);
}
- if (s->iir != UART_IIR_NO_INT) {
- pic_set_irq(s->irq, 1);
+}
+
+static void serial_update_parameters(SerialState *s)
+{
+ int speed, parity, data_bits, stop_bits, frame_size;
+ QEMUSerialSetParams ssp;
+
+ if (s->divider == 0)
+ return;
+
+ /* Start bit. */
+ frame_size = 1;
+ if (s->lcr & 0x08) {
+ /* Parity bit. */
+ frame_size++;
+ if (s->lcr & 0x10)
+ parity = 'E';
+ else
+ parity = 'O';
} else {
- pic_set_irq(s->irq, 0);
+ parity = 'N';
+ }
+ if (s->lcr & 0x04)
+ stop_bits = 2;
+ else
+ stop_bits = 1;
+
+ data_bits = (s->lcr & 0x03) + 5;
+ frame_size += data_bits + stop_bits;
+ speed = s->baudbase / s->divider;
+ ssp.speed = speed;
+ ssp.parity = parity;
+ ssp.data_bits = data_bits;
+ ssp.stop_bits = stop_bits;
+ s->char_transmit_time = (get_ticks_per_sec() / speed) * frame_size;
+ qemu_chr_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
+
+ DPRINTF("speed=%d parity=%c data=%d stop=%d\n",
+ speed, parity, data_bits, stop_bits);
+}
+
+static void serial_update_msl(SerialState *s)
+{
+ uint8_t omsr;
+ int flags;
+
+ qemu_del_timer(s->modem_status_poll);
+
+ if (qemu_chr_ioctl(s->chr,CHR_IOCTL_SERIAL_GET_TIOCM, &flags) == -ENOTSUP) {
+ s->poll_msl = -1;
+ return;
+ }
+
+ omsr = s->msr;
+
+ s->msr = (flags & CHR_TIOCM_CTS) ? s->msr | UART_MSR_CTS : s->msr & ~UART_MSR_CTS;
+ s->msr = (flags & CHR_TIOCM_DSR) ? s->msr | UART_MSR_DSR : s->msr & ~UART_MSR_DSR;
+ s->msr = (flags & CHR_TIOCM_CAR) ? s->msr | UART_MSR_DCD : s->msr & ~UART_MSR_DCD;
+ s->msr = (flags & CHR_TIOCM_RI) ? s->msr | UART_MSR_RI : s->msr & ~UART_MSR_RI;
+
+ if (s->msr != omsr) {
+ /* Set delta bits */
+ s->msr = s->msr | ((s->msr >> 4) ^ (omsr >> 4));
+ /* UART_MSR_TERI only if change was from 1 -> 0 */
+ if ((s->msr & UART_MSR_TERI) && !(omsr & UART_MSR_RI))
+ s->msr &= ~UART_MSR_TERI;
+ serial_update_irq(s);
+ }
+
+ /* The real 16550A apparently has a 250ns response latency to line status changes.
+ We'll be lazy and poll only every 10ms, and only poll it at all if MSI interrupts are turned on */
+
+ if (s->poll_msl)
+ qemu_mod_timer(s->modem_status_poll, qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 100);
+}
+
+static void serial_xmit(void *opaque)
+{
+ SerialState *s = opaque;
+ uint64_t new_xmit_ts = qemu_get_clock_ns(vm_clock);
+
+ if (s->tsr_retry <= 0) {
+ if (s->fcr & UART_FCR_FE) {
+ s->tsr = fifo_get(s,XMIT_FIFO);
+ if (!s->xmit_fifo.count)
+ s->lsr |= UART_LSR_THRE;
+ } else {
+ s->tsr = s->thr;
+ s->lsr |= UART_LSR_THRE;
+ }
+ }
+
+ 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_write(s->chr, &s->tsr, 1) != 1) {
+ if ((s->tsr_retry > 0) && (s->tsr_retry <= MAX_XMIT_RETRY)) {
+ s->tsr_retry++;
+ qemu_mod_timer(s->transmit_timer, new_xmit_ts + s->char_transmit_time);
+ return;
+ } else if (s->poll_msl < 0) {
+ /* If we exceed MAX_XMIT_RETRY and the backend is not a real serial port, then
+ drop any further failed writes instantly, until we get one that goes through.
+ This is to prevent guests that log to unconnected pipes or pty's from stalling. */
+ s->tsr_retry = -1;
+ }
+ }
+ else {
+ s->tsr_retry = 0;
+ }
+
+ s->last_xmit_ts = qemu_get_clock_ns(vm_clock);
+ if (!(s->lsr & UART_LSR_THRE))
+ qemu_mod_timer(s->transmit_timer, s->last_xmit_ts + s->char_transmit_time);
+
+ if (s->lsr & UART_LSR_THRE) {
+ s->lsr |= UART_LSR_TEMT;
+ s->thr_ipending = 1;
+ serial_update_irq(s);
}
}
+
static void serial_ioport_write(void *opaque, uint32_t addr, uint32_t val)
{
SerialState *s = opaque;
- unsigned char ch;
- int ret;
-
+
addr &= 7;
-#ifdef DEBUG_SERIAL
- printf("serial: write addr=0x%02x val=0x%02x\n", addr, val);
-#endif
+ DPRINTF("write addr=0x%02x val=0x%02x\n", addr, val);
switch(addr) {
default:
case 0:
if (s->lcr & UART_LCR_DLAB) {
s->divider = (s->divider & 0xff00) | val;
+ serial_update_parameters(s);
} else {
- s->thr_ipending = 0;
- s->lsr &= ~UART_LSR_THRE;
- serial_update_irq(s);
-
- ch = val;
- do {
- ret = write(s->out_fd, &ch, 1);
- } while (ret != 1);
- s->thr_ipending = 1;
- s->lsr |= UART_LSR_THRE;
- s->lsr |= UART_LSR_TEMT;
- serial_update_irq(s);
+ s->thr = (uint8_t) val;
+ if(s->fcr & UART_FCR_FE) {
+ fifo_put(s, XMIT_FIFO, s->thr);
+ s->thr_ipending = 0;
+ s->lsr &= ~UART_LSR_TEMT;
+ s->lsr &= ~UART_LSR_THRE;
+ serial_update_irq(s);
+ } else {
+ s->thr_ipending = 0;
+ s->lsr &= ~UART_LSR_THRE;
+ serial_update_irq(s);
+ }
+ serial_xmit(s);
}
break;
case 1:
if (s->lcr & UART_LCR_DLAB) {
s->divider = (s->divider & 0x00ff) | (val << 8);
+ serial_update_parameters(s);
} else {
- s->ier = val;
- serial_update_irq(s);
+ s->ier = val & 0x0f;
+ /* If the backend device is a real serial port, turn polling of the modem
+ status lines on physical port on or off depending on UART_IER_MSI state */
+ if (s->poll_msl >= 0) {
+ if (s->ier & UART_IER_MSI) {
+ s->poll_msl = 1;
+ serial_update_msl(s);
+ } else {
+ qemu_del_timer(s->modem_status_poll);
+ s->poll_msl = 0;
+ }
+ }
+ if (s->lsr & UART_LSR_THRE) {
+ s->thr_ipending = 1;
+ serial_update_irq(s);
+ }
}
break;
case 2:
+ val = val & 0xFF;
+
+ if (s->fcr == val)
+ break;
+
+ /* Did the enable/disable flag change? If so, make sure FIFOs get flushed */
+ if ((val ^ s->fcr) & UART_FCR_FE)
+ val |= UART_FCR_XFR | UART_FCR_RFR;
+
+ /* FIFO clear */
+
+ if (val & UART_FCR_RFR) {
+ qemu_del_timer(s->fifo_timeout_timer);
+ s->timeout_ipending=0;
+ fifo_clear(s,RECV_FIFO);
+ }
+
+ if (val & UART_FCR_XFR) {
+ fifo_clear(s,XMIT_FIFO);
+ }
+
+ if (val & UART_FCR_FE) {
+ s->iir |= UART_IIR_FE;
+ /* Set RECV_FIFO trigger Level */
+ switch (val & 0xC0) {
+ case UART_FCR_ITL_1:
+ s->recv_fifo.itl = 1;
+ break;
+ case UART_FCR_ITL_2:
+ s->recv_fifo.itl = 4;
+ break;
+ case UART_FCR_ITL_3:
+ s->recv_fifo.itl = 8;
+ break;
+ case UART_FCR_ITL_4:
+ s->recv_fifo.itl = 14;
+ break;
+ }
+ } else
+ s->iir &= ~UART_IIR_FE;
+
+ /* Set fcr - or at least the bits in it that are supposed to "stick" */
+ s->fcr = val & 0xC9;
+ serial_update_irq(s);
break;
case 3:
- s->lcr = val;
+ {
+ int break_enable;
+ s->lcr = val;
+ serial_update_parameters(s);
+ break_enable = (val >> 6) & 1;
+ if (break_enable != s->last_break_enable) {
+ s->last_break_enable = break_enable;
+ qemu_chr_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_BREAK,
+ &break_enable);
+ }
+ }
break;
case 4:
- s->mcr = val;
+ {
+ int flags;
+ int old_mcr = s->mcr;
+ s->mcr = val & 0x1f;
+ if (val & UART_MCR_LOOP)
+ break;
+
+ if (s->poll_msl >= 0 && old_mcr != s->mcr) {
+
+ qemu_chr_ioctl(s->chr,CHR_IOCTL_SERIAL_GET_TIOCM, &flags);
+
+ flags &= ~(CHR_TIOCM_RTS | CHR_TIOCM_DTR);
+
+ if (val & UART_MCR_RTS)
+ flags |= CHR_TIOCM_RTS;
+ if (val & UART_MCR_DTR)
+ flags |= CHR_TIOCM_DTR;
+
+ qemu_chr_ioctl(s->chr,CHR_IOCTL_SERIAL_SET_TIOCM, &flags);
+ /* Update the modem status after a one-character-send wait-time, since there may be a response
+ from the device/computer at the other end of the serial line */
+ qemu_mod_timer(s->modem_status_poll, qemu_get_clock_ns(vm_clock) + s->char_transmit_time);
+ }
+ }
break;
case 5:
break;
case 6:
- s->msr = val;
break;
case 7:
s->scr = val;
default:
case 0:
if (s->lcr & UART_LCR_DLAB) {
- ret = s->divider & 0xff;
+ ret = s->divider & 0xff;
} else {
- ret = s->rbr;
- s->lsr &= ~(UART_LSR_DR | UART_LSR_BI);
+ if(s->fcr & UART_FCR_FE) {
+ ret = fifo_get(s,RECV_FIFO);
+ if (s->recv_fifo.count == 0)
+ s->lsr &= ~(UART_LSR_DR | UART_LSR_BI);
+ else
+ qemu_mod_timer(s->fifo_timeout_timer, qemu_get_clock_ns (vm_clock) + s->char_transmit_time * 4);
+ s->timeout_ipending = 0;
+ } else {
+ ret = s->rbr;
+ s->lsr &= ~(UART_LSR_DR | UART_LSR_BI);
+ }
serial_update_irq(s);
+ if (!(s->mcr & UART_MCR_LOOP)) {
+ /* in loopback mode, don't receive any data */
+ qemu_chr_accept_input(s->chr);
+ }
}
break;
case 1:
break;
case 2:
ret = s->iir;
- /* reset THR pending bit */
- if ((ret & 0x7) == UART_IIR_THRI)
+ if ((ret & UART_IIR_ID) == UART_IIR_THRI) {
s->thr_ipending = 0;
- serial_update_irq(s);
+ serial_update_irq(s);
+ }
break;
case 3:
ret = s->lcr;
break;
case 5:
ret = s->lsr;
+ /* Clear break and overrun interrupts */
+ if (s->lsr & (UART_LSR_BI|UART_LSR_OE)) {
+ s->lsr &= ~(UART_LSR_BI|UART_LSR_OE);
+ serial_update_irq(s);
+ }
break;
case 6:
if (s->mcr & UART_MCR_LOOP) {
ret |= (s->mcr & 0x02) << 3;
ret |= (s->mcr & 0x01) << 5;
} else {
+ if (s->poll_msl >= 0)
+ serial_update_msl(s);
ret = s->msr;
+ /* Clear delta bits & msr int after read, if they were set */
+ if (s->msr & UART_MSR_ANY_DELTA) {
+ s->msr &= 0xF0;
+ serial_update_irq(s);
+ }
}
break;
case 7:
ret = s->scr;
break;
}
-#ifdef DEBUG_SERIAL
- printf("serial: read addr=0x%02x val=0x%02x\n", addr, ret);
-#endif
+ DPRINTF("read addr=0x%02x val=0x%02x\n", addr, ret);
return ret;
}
-int serial_can_receive(SerialState *s)
+static int serial_can_receive(SerialState *s)
{
+ if(s->fcr & UART_FCR_FE) {
+ if(s->recv_fifo.count < UART_FIFO_LENGTH)
+ /* Advertise (fifo.itl - fifo.count) bytes when count < ITL, and 1 if above. If UART_FIFO_LENGTH - fifo.count is
+ advertised the effect will be to almost always fill the fifo completely before the guest has a chance to respond,
+ effectively overriding the ITL that the guest has set. */
+ return (s->recv_fifo.count <= s->recv_fifo.itl) ? s->recv_fifo.itl - s->recv_fifo.count : 1;
+ else
+ return 0;
+ } else {
return !(s->lsr & UART_LSR_DR);
+ }
}
-void serial_receive_byte(SerialState *s, int ch)
-{
- s->rbr = ch;
- s->lsr |= UART_LSR_DR;
- serial_update_irq(s);
-}
-
-void serial_receive_break(SerialState *s)
+static void serial_receive_break(SerialState *s)
{
s->rbr = 0;
+ /* When the LSR_DR is set a null byte is pushed into the fifo */
+ fifo_put(s, RECV_FIFO, '\0');
s->lsr |= UART_LSR_BI | UART_LSR_DR;
serial_update_irq(s);
}
+/* There's data in recv_fifo and s->rbr has not been read for 4 char transmit times */
+static void fifo_timeout_int (void *opaque) {
+ SerialState *s = opaque;
+ if (s->recv_fifo.count) {
+ s->timeout_ipending = 1;
+ serial_update_irq(s);
+ }
+}
+
static int serial_can_receive1(void *opaque)
{
SerialState *s = opaque;
static void serial_receive1(void *opaque, const uint8_t *buf, int size)
{
SerialState *s = opaque;
- serial_receive_byte(s, buf[0]);
+ if(s->fcr & UART_FCR_FE) {
+ int i;
+ for (i = 0; i < size; i++) {
+ fifo_put(s, RECV_FIFO, buf[i]);
+ }
+ s->lsr |= UART_LSR_DR;
+ /* call the timeout receive callback in 4 char transmit time */
+ qemu_mod_timer(s->fifo_timeout_timer, qemu_get_clock_ns (vm_clock) + s->char_transmit_time * 4);
+ } else {
+ if (s->lsr & UART_LSR_DR)
+ s->lsr |= UART_LSR_OE;
+ s->rbr = buf[0];
+ s->lsr |= UART_LSR_DR;
+ }
+ serial_update_irq(s);
+}
+
+static void serial_event(void *opaque, int event)
+{
+ SerialState *s = opaque;
+ DPRINTF("event %x\n", event);
+ if (event == CHR_EVENT_BREAK)
+ serial_receive_break(s);
+}
+
+static void serial_pre_save(void *opaque)
+{
+ SerialState *s = opaque;
+ s->fcr_vmstate = s->fcr;
+}
+
+static int serial_post_load(void *opaque, int version_id)
+{
+ SerialState *s = opaque;
+
+ if (version_id < 3) {
+ s->fcr_vmstate = 0;
+ }
+ /* Initialize fcr via setter to perform essential side-effects */
+ serial_ioport_write(s, 0x02, s->fcr_vmstate);
+ serial_update_parameters(s);
+ return 0;
+}
+
+static const VMStateDescription vmstate_serial = {
+ .name = "serial",
+ .version_id = 3,
+ .minimum_version_id = 2,
+ .pre_save = serial_pre_save,
+ .post_load = serial_post_load,
+ .fields = (VMStateField []) {
+ VMSTATE_UINT16_V(divider, SerialState, 2),
+ VMSTATE_UINT8(rbr, SerialState),
+ VMSTATE_UINT8(ier, SerialState),
+ VMSTATE_UINT8(iir, SerialState),
+ VMSTATE_UINT8(lcr, SerialState),
+ VMSTATE_UINT8(mcr, SerialState),
+ VMSTATE_UINT8(lsr, SerialState),
+ VMSTATE_UINT8(msr, SerialState),
+ VMSTATE_UINT8(scr, SerialState),
+ VMSTATE_UINT8_V(fcr_vmstate, SerialState, 3),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static void serial_reset(void *opaque)
+{
+ SerialState *s = opaque;
+
+ s->rbr = 0;
+ s->ier = 0;
+ s->iir = UART_IIR_NO_INT;
+ s->lcr = 0;
+ s->lsr = UART_LSR_TEMT | UART_LSR_THRE;
+ s->msr = UART_MSR_DCD | UART_MSR_DSR | UART_MSR_CTS;
+ /* Default to 9600 baud, 1 start bit, 8 data bits, 1 stop bit, no parity. */
+ s->divider = 0x0C;
+ s->mcr = UART_MCR_OUT2;
+ s->scr = 0;
+ s->tsr_retry = 0;
+ s->char_transmit_time = (get_ticks_per_sec() / 9600) * 10;
+ s->poll_msl = 0;
+
+ fifo_clear(s,RECV_FIFO);
+ fifo_clear(s,XMIT_FIFO);
+
+ s->last_xmit_ts = qemu_get_clock_ns(vm_clock);
+
+ s->thr_ipending = 0;
+ s->last_break_enable = 0;
+ qemu_irq_lower(s->irq);
+}
+
+static void serial_init_core(SerialState *s)
+{
+ if (!s->chr) {
+ fprintf(stderr, "Can't create serial device, empty char device\n");
+ exit(1);
+ }
+
+ s->modem_status_poll = qemu_new_timer_ns(vm_clock, (QEMUTimerCB *) serial_update_msl, s);
+
+ s->fifo_timeout_timer = qemu_new_timer_ns(vm_clock, (QEMUTimerCB *) fifo_timeout_int, s);
+ s->transmit_timer = qemu_new_timer_ns(vm_clock, (QEMUTimerCB *) serial_xmit, s);
+
+ qemu_register_reset(serial_reset, s);
+
+ qemu_chr_add_handlers(s->chr, serial_can_receive1, serial_receive1,
+ serial_event, s);
+}
+
+/* Change the main reference oscillator frequency. */
+void serial_set_frequency(SerialState *s, uint32_t frequency)
+{
+ s->baudbase = frequency;
+ serial_update_parameters(s);
+}
+
+static const int isa_serial_io[MAX_SERIAL_PORTS] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
+static const int isa_serial_irq[MAX_SERIAL_PORTS] = { 4, 3, 4, 3 };
+
+static int serial_isa_initfn(ISADevice *dev)
+{
+ static int index;
+ ISASerialState *isa = DO_UPCAST(ISASerialState, dev, dev);
+ SerialState *s = &isa->state;
+
+ if (isa->index == -1)
+ isa->index = index;
+ if (isa->index >= MAX_SERIAL_PORTS)
+ return -1;
+ if (isa->iobase == -1)
+ isa->iobase = isa_serial_io[isa->index];
+ if (isa->isairq == -1)
+ isa->isairq = isa_serial_irq[isa->index];
+ index++;
+
+ s->baudbase = 115200;
+ isa_init_irq(dev, &s->irq, isa->isairq);
+ serial_init_core(s);
+ qdev_set_legacy_instance_id(&dev->qdev, isa->iobase, 3);
+
+ register_ioport_write(isa->iobase, 8, 1, serial_ioport_write, s);
+ register_ioport_read(isa->iobase, 8, 1, serial_ioport_read, s);
+ isa_init_ioport_range(dev, isa->iobase, 8);
+ return 0;
}
-/* If fd is zero, it means that the serial device uses the console */
-SerialState *serial_init(int base, int irq, int fd)
+static const VMStateDescription vmstate_isa_serial = {
+ .name = "serial",
+ .version_id = 3,
+ .minimum_version_id = 2,
+ .fields = (VMStateField []) {
+ VMSTATE_STRUCT(state, ISASerialState, 0, vmstate_serial, SerialState),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+SerialState *serial_init(int base, qemu_irq irq, int baudbase,
+ CharDriverState *chr)
{
SerialState *s;
s = qemu_mallocz(sizeof(SerialState));
- if (!s)
- return NULL;
+
s->irq = irq;
- s->lsr = UART_LSR_TEMT | UART_LSR_THRE;
- s->iir = UART_IIR_NO_INT;
+ s->baudbase = baudbase;
+ s->chr = chr;
+ serial_init_core(s);
+
+ vmstate_register(NULL, base, &vmstate_serial, s);
register_ioport_write(base, 8, 1, serial_ioport_write, s);
register_ioport_read(base, 8, 1, serial_ioport_read, s);
+ return s;
+}
- if (fd != 0) {
- qemu_add_fd_read_handler(fd, serial_can_receive1, serial_receive1, s);
- s->out_fd = fd;
- } else {
- serial_console = s;
- s->out_fd = 1;
+/* Memory mapped interface */
+static uint32_t serial_mm_readb(void *opaque, target_phys_addr_t addr)
+{
+ SerialState *s = opaque;
+
+ return serial_ioport_read(s, addr >> s->it_shift) & 0xFF;
+}
+
+static void serial_mm_writeb(void *opaque, target_phys_addr_t addr,
+ uint32_t value)
+{
+ SerialState *s = opaque;
+
+ serial_ioport_write(s, addr >> s->it_shift, value & 0xFF);
+}
+
+static uint32_t serial_mm_readw_be(void *opaque, target_phys_addr_t addr)
+{
+ SerialState *s = opaque;
+ uint32_t val;
+
+ val = serial_ioport_read(s, addr >> s->it_shift) & 0xFFFF;
+ val = bswap16(val);
+ return val;
+}
+
+static uint32_t serial_mm_readw_le(void *opaque, target_phys_addr_t addr)
+{
+ SerialState *s = opaque;
+ uint32_t val;
+
+ val = serial_ioport_read(s, addr >> s->it_shift) & 0xFFFF;
+ return val;
+}
+
+static void serial_mm_writew_be(void *opaque, target_phys_addr_t addr,
+ uint32_t value)
+{
+ SerialState *s = opaque;
+
+ value = bswap16(value);
+ serial_ioport_write(s, addr >> s->it_shift, value & 0xFFFF);
+}
+
+static void serial_mm_writew_le(void *opaque, target_phys_addr_t addr,
+ uint32_t value)
+{
+ SerialState *s = opaque;
+
+ serial_ioport_write(s, addr >> s->it_shift, value & 0xFFFF);
+}
+
+static uint32_t serial_mm_readl_be(void *opaque, target_phys_addr_t addr)
+{
+ SerialState *s = opaque;
+ uint32_t val;
+
+ val = serial_ioport_read(s, addr >> s->it_shift);
+ val = bswap32(val);
+ return val;
+}
+
+static uint32_t serial_mm_readl_le(void *opaque, target_phys_addr_t addr)
+{
+ SerialState *s = opaque;
+ uint32_t val;
+
+ val = serial_ioport_read(s, addr >> s->it_shift);
+ return val;
+}
+
+static void serial_mm_writel_be(void *opaque, target_phys_addr_t addr,
+ uint32_t value)
+{
+ SerialState *s = opaque;
+
+ value = bswap32(value);
+ serial_ioport_write(s, addr >> s->it_shift, value);
+}
+
+static void serial_mm_writel_le(void *opaque, target_phys_addr_t addr,
+ uint32_t value)
+{
+ SerialState *s = opaque;
+
+ serial_ioport_write(s, addr >> s->it_shift, value);
+}
+
+static CPUReadMemoryFunc * const serial_mm_read_be[] = {
+ &serial_mm_readb,
+ &serial_mm_readw_be,
+ &serial_mm_readl_be,
+};
+
+static CPUWriteMemoryFunc * const serial_mm_write_be[] = {
+ &serial_mm_writeb,
+ &serial_mm_writew_be,
+ &serial_mm_writel_be,
+};
+
+static CPUReadMemoryFunc * const serial_mm_read_le[] = {
+ &serial_mm_readb,
+ &serial_mm_readw_le,
+ &serial_mm_readl_le,
+};
+
+static CPUWriteMemoryFunc * const serial_mm_write_le[] = {
+ &serial_mm_writeb,
+ &serial_mm_writew_le,
+ &serial_mm_writel_le,
+};
+
+SerialState *serial_mm_init (target_phys_addr_t base, int it_shift,
+ qemu_irq irq, int baudbase,
+ CharDriverState *chr, int ioregister,
+ int be)
+{
+ SerialState *s;
+ int s_io_memory;
+
+ s = qemu_mallocz(sizeof(SerialState));
+
+ s->it_shift = it_shift;
+ s->irq = irq;
+ s->baudbase = baudbase;
+ s->chr = chr;
+
+ serial_init_core(s);
+ vmstate_register(NULL, base, &vmstate_serial, s);
+
+ if (ioregister) {
+ if (be) {
+ s_io_memory = cpu_register_io_memory(serial_mm_read_be,
+ serial_mm_write_be, s,
+ DEVICE_NATIVE_ENDIAN);
+ } else {
+ s_io_memory = cpu_register_io_memory(serial_mm_read_le,
+ serial_mm_write_le, s,
+ DEVICE_NATIVE_ENDIAN);
+ }
+ cpu_register_physical_memory(base, 8 << it_shift, s_io_memory);
}
+ serial_update_msl(s);
return s;
}
+
+static ISADeviceInfo serial_isa_info = {
+ .qdev.name = "isa-serial",
+ .qdev.size = sizeof(ISASerialState),
+ .qdev.vmsd = &vmstate_isa_serial,
+ .init = serial_isa_initfn,
+ .qdev.props = (Property[]) {
+ DEFINE_PROP_UINT32("index", ISASerialState, index, -1),
+ DEFINE_PROP_HEX32("iobase", ISASerialState, iobase, -1),
+ DEFINE_PROP_UINT32("irq", ISASerialState, isairq, -1),
+ DEFINE_PROP_CHR("chardev", ISASerialState, state.chr),
+ DEFINE_PROP_END_OF_LIST(),
+ },
+};
+
+static void serial_register_devices(void)
+{
+ isa_qdev_register(&serial_isa_info);
+}
+
+device_init(serial_register_devices)
projects / qemu.git / blobdiff