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* QEMU 16550A UART emulation
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* Copyright (c) 2003-2004 Fabrice Bellard
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* Copyright (c) 2008 Citrix Systems, Inc.
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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#include "hw/char/serial.h"
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#include "sysemu/char.h"
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#include "qemu/timer.h"
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#include "exec/address-spaces.h"
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//#define DEBUG_SERIAL
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#define UART_LCR_DLAB 0x80 /* Divisor latch access bit */
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#define UART_IER_MSI 0x08 /* Enable Modem status interrupt */
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#define UART_IER_RLSI 0x04 /* Enable receiver line status interrupt */
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#define UART_IER_THRI 0x02 /* Enable Transmitter holding register int. */
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#define UART_IER_RDI 0x01 /* Enable receiver data interrupt */
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#define UART_IIR_NO_INT 0x01 /* No interrupts pending */
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#define UART_IIR_ID 0x06 /* Mask for the interrupt ID */
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#define UART_IIR_MSI 0x00 /* Modem status interrupt */
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#define UART_IIR_THRI 0x02 /* Transmitter holding register empty */
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#define UART_IIR_RDI 0x04 /* Receiver data interrupt */
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#define UART_IIR_RLSI 0x06 /* Receiver line status interrupt */
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#define UART_IIR_CTI 0x0C /* Character Timeout Indication */
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#define UART_IIR_FENF 0x80 /* Fifo enabled, but not functionning */
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#define UART_IIR_FE 0xC0 /* Fifo enabled */
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* These are the definitions for the Modem Control Register
55
#define UART_MCR_LOOP 0x10 /* Enable loopback test mode */
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#define UART_MCR_OUT2 0x08 /* Out2 complement */
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#define UART_MCR_OUT1 0x04 /* Out1 complement */
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#define UART_MCR_RTS 0x02 /* RTS complement */
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#define UART_MCR_DTR 0x01 /* DTR complement */
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* These are the definitions for the Modem Status Register
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#define UART_MSR_DCD 0x80 /* Data Carrier Detect */
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#define UART_MSR_RI 0x40 /* Ring Indicator */
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#define UART_MSR_DSR 0x20 /* Data Set Ready */
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#define UART_MSR_CTS 0x10 /* Clear to Send */
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#define UART_MSR_DDCD 0x08 /* Delta DCD */
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#define UART_MSR_TERI 0x04 /* Trailing edge ring indicator */
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#define UART_MSR_DDSR 0x02 /* Delta DSR */
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#define UART_MSR_DCTS 0x01 /* Delta CTS */
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#define UART_MSR_ANY_DELTA 0x0F /* Any of the delta bits! */
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#define UART_LSR_TEMT 0x40 /* Transmitter empty */
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#define UART_LSR_THRE 0x20 /* Transmit-hold-register empty */
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#define UART_LSR_BI 0x10 /* Break interrupt indicator */
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#define UART_LSR_FE 0x08 /* Frame error indicator */
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#define UART_LSR_PE 0x04 /* Parity error indicator */
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#define UART_LSR_OE 0x02 /* Overrun error indicator */
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#define UART_LSR_DR 0x01 /* Receiver data ready */
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#define UART_LSR_INT_ANY 0x1E /* Any of the lsr-interrupt-triggering status bits */
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/* Interrupt trigger levels. The byte-counts are for 16550A - in newer UARTs the byte-count for each ITL is higher. */
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#define UART_FCR_ITL_1 0x00 /* 1 byte ITL */
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#define UART_FCR_ITL_2 0x40 /* 4 bytes ITL */
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#define UART_FCR_ITL_3 0x80 /* 8 bytes ITL */
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#define UART_FCR_ITL_4 0xC0 /* 14 bytes ITL */
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#define UART_FCR_DMS 0x08 /* DMA Mode Select */
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#define UART_FCR_XFR 0x04 /* XMIT Fifo Reset */
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#define UART_FCR_RFR 0x02 /* RCVR Fifo Reset */
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#define UART_FCR_FE 0x01 /* FIFO Enable */
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#define MAX_XMIT_RETRY 4
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#define DPRINTF(fmt, ...) \
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do { fprintf(stderr, "serial: " fmt , ## __VA_ARGS__); } while (0)
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#define DPRINTF(fmt, ...) \
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static void serial_receive1(void *opaque, const uint8_t *buf, int size);
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static void fifo_clear(SerialState *s, int fifo)
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SerialFIFO *f = (fifo) ? &s->recv_fifo : &s->xmit_fifo;
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memset(f->data, 0, UART_FIFO_LENGTH);
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static int fifo_put(SerialState *s, int fifo, uint8_t chr)
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SerialFIFO *f = (fifo) ? &s->recv_fifo : &s->xmit_fifo;
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/* Receive overruns do not overwrite FIFO contents. */
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if (fifo == XMIT_FIFO || f->count < UART_FIFO_LENGTH) {
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f->data[f->head++] = chr;
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if (f->head == UART_FIFO_LENGTH)
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if (f->count < UART_FIFO_LENGTH)
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else if (fifo == RECV_FIFO)
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s->lsr |= UART_LSR_OE;
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static uint8_t fifo_get(SerialState *s, int fifo)
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SerialFIFO *f = (fifo) ? &s->recv_fifo : &s->xmit_fifo;
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c = f->data[f->tail++];
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if (f->tail == UART_FIFO_LENGTH)
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static void serial_update_irq(SerialState *s)
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uint8_t tmp_iir = UART_IIR_NO_INT;
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if ((s->ier & UART_IER_RLSI) && (s->lsr & UART_LSR_INT_ANY)) {
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tmp_iir = UART_IIR_RLSI;
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} else if ((s->ier & UART_IER_RDI) && s->timeout_ipending) {
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/* Note that(s->ier & UART_IER_RDI) can mask this interrupt,
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* this is not in the specification but is observed on existing
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tmp_iir = UART_IIR_CTI;
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} else if ((s->ier & UART_IER_RDI) && (s->lsr & UART_LSR_DR) &&
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(!(s->fcr & UART_FCR_FE) ||
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s->recv_fifo.count >= s->recv_fifo.itl)) {
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tmp_iir = UART_IIR_RDI;
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} else if ((s->ier & UART_IER_THRI) && s->thr_ipending) {
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tmp_iir = UART_IIR_THRI;
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} else if ((s->ier & UART_IER_MSI) && (s->msr & UART_MSR_ANY_DELTA)) {
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tmp_iir = UART_IIR_MSI;
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s->iir = tmp_iir | (s->iir & 0xF0);
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if (tmp_iir != UART_IIR_NO_INT) {
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qemu_irq_raise(s->irq);
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qemu_irq_lower(s->irq);
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static void serial_update_parameters(SerialState *s)
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int speed, parity, data_bits, stop_bits, frame_size;
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QEMUSerialSetParams ssp;
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data_bits = (s->lcr & 0x03) + 5;
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frame_size += data_bits + stop_bits;
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speed = s->baudbase / s->divider;
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ssp.data_bits = data_bits;
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ssp.stop_bits = stop_bits;
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s->char_transmit_time = (get_ticks_per_sec() / speed) * frame_size;
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qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
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DPRINTF("speed=%d parity=%c data=%d stop=%d\n",
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speed, parity, data_bits, stop_bits);
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static void serial_update_msl(SerialState *s)
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qemu_del_timer(s->modem_status_poll);
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if (qemu_chr_fe_ioctl(s->chr,CHR_IOCTL_SERIAL_GET_TIOCM, &flags) == -ENOTSUP) {
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s->msr = (flags & CHR_TIOCM_CTS) ? s->msr | UART_MSR_CTS : s->msr & ~UART_MSR_CTS;
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s->msr = (flags & CHR_TIOCM_DSR) ? s->msr | UART_MSR_DSR : s->msr & ~UART_MSR_DSR;
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s->msr = (flags & CHR_TIOCM_CAR) ? s->msr | UART_MSR_DCD : s->msr & ~UART_MSR_DCD;
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s->msr = (flags & CHR_TIOCM_RI) ? s->msr | UART_MSR_RI : s->msr & ~UART_MSR_RI;
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if (s->msr != omsr) {
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s->msr = s->msr | ((s->msr >> 4) ^ (omsr >> 4));
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/* UART_MSR_TERI only if change was from 1 -> 0 */
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if ((s->msr & UART_MSR_TERI) && !(omsr & UART_MSR_RI))
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s->msr &= ~UART_MSR_TERI;
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serial_update_irq(s);
252
/* The real 16550A apparently has a 250ns response latency to line status changes.
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We'll be lazy and poll only every 10ms, and only poll it at all if MSI interrupts are turned on */
256
qemu_mod_timer(s->modem_status_poll, qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 100);
259
static gboolean serial_xmit(GIOChannel *chan, GIOCondition cond, void *opaque)
261
SerialState *s = opaque;
263
if (s->tsr_retry <= 0) {
264
if (s->fcr & UART_FCR_FE) {
265
s->tsr = fifo_get(s,XMIT_FIFO);
266
if (!s->xmit_fifo.count)
267
s->lsr |= UART_LSR_THRE;
268
} else if ((s->lsr & UART_LSR_THRE)) {
272
s->lsr |= UART_LSR_THRE;
273
s->lsr &= ~UART_LSR_TEMT;
277
if (s->mcr & UART_MCR_LOOP) {
278
/* in loopback mode, say that we just received a char */
279
serial_receive1(s, &s->tsr, 1);
280
} else if (qemu_chr_fe_write(s->chr, &s->tsr, 1) != 1) {
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if (s->tsr_retry >= 0 && s->tsr_retry < MAX_XMIT_RETRY &&
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qemu_chr_fe_add_watch(s->chr, G_IO_OUT, serial_xmit, s) > 0) {
291
s->last_xmit_ts = qemu_get_clock_ns(vm_clock);
293
if (s->lsr & UART_LSR_THRE) {
294
s->lsr |= UART_LSR_TEMT;
296
serial_update_irq(s);
303
static void serial_ioport_write(void *opaque, hwaddr addr, uint64_t val,
306
SerialState *s = opaque;
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DPRINTF("write addr=0x%" HWADDR_PRIx " val=0x%" PRIx64 "\n", addr, val);
313
if (s->lcr & UART_LCR_DLAB) {
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s->divider = (s->divider & 0xff00) | val;
315
serial_update_parameters(s);
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s->thr = (uint8_t) val;
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if(s->fcr & UART_FCR_FE) {
319
fifo_put(s, XMIT_FIFO, s->thr);
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s->lsr &= ~UART_LSR_TEMT;
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s->lsr &= ~UART_LSR_THRE;
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serial_update_irq(s);
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s->lsr &= ~UART_LSR_THRE;
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serial_update_irq(s);
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serial_xmit(NULL, G_IO_OUT, s);
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if (s->lcr & UART_LCR_DLAB) {
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s->divider = (s->divider & 0x00ff) | (val << 8);
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serial_update_parameters(s);
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/* If the backend device is a real serial port, turn polling of the modem
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status lines on physical port on or off depending on UART_IER_MSI state */
340
if (s->poll_msl >= 0) {
341
if (s->ier & UART_IER_MSI) {
343
serial_update_msl(s);
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qemu_del_timer(s->modem_status_poll);
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if (s->lsr & UART_LSR_THRE) {
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serial_update_irq(s);
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/* Did the enable/disable flag change? If so, make sure FIFOs get flushed */
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if ((val ^ s->fcr) & UART_FCR_FE)
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val |= UART_FCR_XFR | UART_FCR_RFR;
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if (val & UART_FCR_RFR) {
368
qemu_del_timer(s->fifo_timeout_timer);
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s->timeout_ipending=0;
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fifo_clear(s,RECV_FIFO);
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if (val & UART_FCR_XFR) {
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fifo_clear(s,XMIT_FIFO);
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if (val & UART_FCR_FE) {
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s->iir |= UART_IIR_FE;
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/* Set RECV_FIFO trigger Level */
380
switch (val & 0xC0) {
382
s->recv_fifo.itl = 1;
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s->recv_fifo.itl = 4;
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s->recv_fifo.itl = 8;
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s->recv_fifo.itl = 14;
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s->iir &= ~UART_IIR_FE;
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/* Set fcr - or at least the bits in it that are supposed to "stick" */
399
serial_update_irq(s);
405
serial_update_parameters(s);
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break_enable = (val >> 6) & 1;
407
if (break_enable != s->last_break_enable) {
408
s->last_break_enable = break_enable;
409
qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_BREAK,
417
int old_mcr = s->mcr;
419
if (val & UART_MCR_LOOP)
422
if (s->poll_msl >= 0 && old_mcr != s->mcr) {
424
qemu_chr_fe_ioctl(s->chr,CHR_IOCTL_SERIAL_GET_TIOCM, &flags);
426
flags &= ~(CHR_TIOCM_RTS | CHR_TIOCM_DTR);
428
if (val & UART_MCR_RTS)
429
flags |= CHR_TIOCM_RTS;
430
if (val & UART_MCR_DTR)
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flags |= CHR_TIOCM_DTR;
433
qemu_chr_fe_ioctl(s->chr,CHR_IOCTL_SERIAL_SET_TIOCM, &flags);
434
/* Update the modem status after a one-character-send wait-time, since there may be a response
435
from the device/computer at the other end of the serial line */
436
qemu_mod_timer(s->modem_status_poll, qemu_get_clock_ns(vm_clock) + s->char_transmit_time);
450
static uint64_t serial_ioport_read(void *opaque, hwaddr addr, unsigned size)
452
SerialState *s = opaque;
459
if (s->lcr & UART_LCR_DLAB) {
460
ret = s->divider & 0xff;
462
if(s->fcr & UART_FCR_FE) {
463
ret = fifo_get(s,RECV_FIFO);
464
if (s->recv_fifo.count == 0)
465
s->lsr &= ~(UART_LSR_DR | UART_LSR_BI);
467
qemu_mod_timer(s->fifo_timeout_timer, qemu_get_clock_ns (vm_clock) + s->char_transmit_time * 4);
468
s->timeout_ipending = 0;
471
s->lsr &= ~(UART_LSR_DR | UART_LSR_BI);
473
serial_update_irq(s);
474
if (!(s->mcr & UART_MCR_LOOP)) {
475
/* in loopback mode, don't receive any data */
476
qemu_chr_accept_input(s->chr);
481
if (s->lcr & UART_LCR_DLAB) {
482
ret = (s->divider >> 8) & 0xff;
489
if ((ret & UART_IIR_ID) == UART_IIR_THRI) {
491
serial_update_irq(s);
502
/* Clear break and overrun interrupts */
503
if (s->lsr & (UART_LSR_BI|UART_LSR_OE)) {
504
s->lsr &= ~(UART_LSR_BI|UART_LSR_OE);
505
serial_update_irq(s);
509
if (s->mcr & UART_MCR_LOOP) {
510
/* in loopback, the modem output pins are connected to the
512
ret = (s->mcr & 0x0c) << 4;
513
ret |= (s->mcr & 0x02) << 3;
514
ret |= (s->mcr & 0x01) << 5;
516
if (s->poll_msl >= 0)
517
serial_update_msl(s);
519
/* Clear delta bits & msr int after read, if they were set */
520
if (s->msr & UART_MSR_ANY_DELTA) {
522
serial_update_irq(s);
530
DPRINTF("read addr=0x%" HWADDR_PRIx " val=0x%02x\n", addr, ret);
534
static int serial_can_receive(SerialState *s)
536
if(s->fcr & UART_FCR_FE) {
537
if(s->recv_fifo.count < UART_FIFO_LENGTH)
538
/* Advertise (fifo.itl - fifo.count) bytes when count < ITL, and 1 if above. If UART_FIFO_LENGTH - fifo.count is
539
advertised the effect will be to almost always fill the fifo completely before the guest has a chance to respond,
540
effectively overriding the ITL that the guest has set. */
541
return (s->recv_fifo.count <= s->recv_fifo.itl) ? s->recv_fifo.itl - s->recv_fifo.count : 1;
545
return !(s->lsr & UART_LSR_DR);
549
static void serial_receive_break(SerialState *s)
552
/* When the LSR_DR is set a null byte is pushed into the fifo */
553
fifo_put(s, RECV_FIFO, '\0');
554
s->lsr |= UART_LSR_BI | UART_LSR_DR;
555
serial_update_irq(s);
558
/* There's data in recv_fifo and s->rbr has not been read for 4 char transmit times */
559
static void fifo_timeout_int (void *opaque) {
560
SerialState *s = opaque;
561
if (s->recv_fifo.count) {
562
s->timeout_ipending = 1;
563
serial_update_irq(s);
567
static int serial_can_receive1(void *opaque)
569
SerialState *s = opaque;
570
return serial_can_receive(s);
573
static void serial_receive1(void *opaque, const uint8_t *buf, int size)
575
SerialState *s = opaque;
578
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
580
if(s->fcr & UART_FCR_FE) {
582
for (i = 0; i < size; i++) {
583
fifo_put(s, RECV_FIFO, buf[i]);
585
s->lsr |= UART_LSR_DR;
586
/* call the timeout receive callback in 4 char transmit time */
587
qemu_mod_timer(s->fifo_timeout_timer, qemu_get_clock_ns (vm_clock) + s->char_transmit_time * 4);
589
if (s->lsr & UART_LSR_DR)
590
s->lsr |= UART_LSR_OE;
592
s->lsr |= UART_LSR_DR;
594
serial_update_irq(s);
597
static void serial_event(void *opaque, int event)
599
SerialState *s = opaque;
600
DPRINTF("event %x\n", event);
601
if (event == CHR_EVENT_BREAK)
602
serial_receive_break(s);
605
static void serial_pre_save(void *opaque)
607
SerialState *s = opaque;
608
s->fcr_vmstate = s->fcr;
611
static int serial_post_load(void *opaque, int version_id)
613
SerialState *s = opaque;
615
if (version_id < 3) {
618
/* Initialize fcr via setter to perform essential side-effects */
619
serial_ioport_write(s, 0x02, s->fcr_vmstate, 1);
620
serial_update_parameters(s);
624
const VMStateDescription vmstate_serial = {
627
.minimum_version_id = 2,
628
.pre_save = serial_pre_save,
629
.post_load = serial_post_load,
630
.fields = (VMStateField []) {
631
VMSTATE_UINT16_V(divider, SerialState, 2),
632
VMSTATE_UINT8(rbr, SerialState),
633
VMSTATE_UINT8(ier, SerialState),
634
VMSTATE_UINT8(iir, SerialState),
635
VMSTATE_UINT8(lcr, SerialState),
636
VMSTATE_UINT8(mcr, SerialState),
637
VMSTATE_UINT8(lsr, SerialState),
638
VMSTATE_UINT8(msr, SerialState),
639
VMSTATE_UINT8(scr, SerialState),
640
VMSTATE_UINT8_V(fcr_vmstate, SerialState, 3),
641
VMSTATE_END_OF_LIST()
645
static void serial_reset(void *opaque)
647
SerialState *s = opaque;
651
s->iir = UART_IIR_NO_INT;
653
s->lsr = UART_LSR_TEMT | UART_LSR_THRE;
654
s->msr = UART_MSR_DCD | UART_MSR_DSR | UART_MSR_CTS;
655
/* Default to 9600 baud, 1 start bit, 8 data bits, 1 stop bit, no parity. */
657
s->mcr = UART_MCR_OUT2;
660
s->char_transmit_time = (get_ticks_per_sec() / 9600) * 10;
663
fifo_clear(s,RECV_FIFO);
664
fifo_clear(s,XMIT_FIFO);
666
s->last_xmit_ts = qemu_get_clock_ns(vm_clock);
669
s->last_break_enable = 0;
670
qemu_irq_lower(s->irq);
673
void serial_init_core(SerialState *s)
676
fprintf(stderr, "Can't create serial device, empty char device\n");
680
s->modem_status_poll = qemu_new_timer_ns(vm_clock, (QEMUTimerCB *) serial_update_msl, s);
682
s->fifo_timeout_timer = qemu_new_timer_ns(vm_clock, (QEMUTimerCB *) fifo_timeout_int, s);
683
qemu_register_reset(serial_reset, s);
685
qemu_chr_add_handlers(s->chr, serial_can_receive1, serial_receive1,
689
void serial_exit_core(SerialState *s)
691
qemu_chr_add_handlers(s->chr, NULL, NULL, NULL, NULL);
692
qemu_unregister_reset(serial_reset, s);
695
/* Change the main reference oscillator frequency. */
696
void serial_set_frequency(SerialState *s, uint32_t frequency)
698
s->baudbase = frequency;
699
serial_update_parameters(s);
702
const MemoryRegionOps serial_io_ops = {
703
.read = serial_ioport_read,
704
.write = serial_ioport_write,
706
.min_access_size = 1,
707
.max_access_size = 1,
709
.endianness = DEVICE_LITTLE_ENDIAN,
712
SerialState *serial_init(int base, qemu_irq irq, int baudbase,
713
CharDriverState *chr, MemoryRegion *system_io)
717
s = g_malloc0(sizeof(SerialState));
720
s->baudbase = baudbase;
724
vmstate_register(NULL, base, &vmstate_serial, s);
726
memory_region_init_io(&s->io, &serial_io_ops, s, "serial", 8);
727
memory_region_add_subregion(system_io, base, &s->io);
732
/* Memory mapped interface */
733
static uint64_t serial_mm_read(void *opaque, hwaddr addr,
736
SerialState *s = opaque;
737
return serial_ioport_read(s, addr >> s->it_shift, 1);
740
static void serial_mm_write(void *opaque, hwaddr addr,
741
uint64_t value, unsigned size)
743
SerialState *s = opaque;
744
value &= ~0u >> (32 - (size * 8));
745
serial_ioport_write(s, addr >> s->it_shift, value, 1);
748
static const MemoryRegionOps serial_mm_ops[3] = {
749
[DEVICE_NATIVE_ENDIAN] = {
750
.read = serial_mm_read,
751
.write = serial_mm_write,
752
.endianness = DEVICE_NATIVE_ENDIAN,
754
[DEVICE_LITTLE_ENDIAN] = {
755
.read = serial_mm_read,
756
.write = serial_mm_write,
757
.endianness = DEVICE_LITTLE_ENDIAN,
759
[DEVICE_BIG_ENDIAN] = {
760
.read = serial_mm_read,
761
.write = serial_mm_write,
762
.endianness = DEVICE_BIG_ENDIAN,
766
SerialState *serial_mm_init(MemoryRegion *address_space,
767
hwaddr base, int it_shift,
768
qemu_irq irq, int baudbase,
769
CharDriverState *chr, enum device_endian end)
773
s = g_malloc0(sizeof(SerialState));
775
s->it_shift = it_shift;
777
s->baudbase = baudbase;
781
vmstate_register(NULL, base, &vmstate_serial, s);
784
memory_region_init_io(&s->io, &serial_mm_ops[end], s,
785
"serial", 8 << it_shift);
786
memory_region_add_subregion(address_space, base, &s->io);
789
serial_update_msl(s);
793
void serial_change_char_driver(SerialState *s, CharDriverState *chr)
795
/* TODO this is somewhat guesswork, and pretty ugly anyhow */
796
qemu_chr_add_handlers(s->chr, NULL, NULL, NULL, NULL);
798
qemu_chr_add_handlers(s->chr, serial_can_receive1, serial_receive1,
800
serial_update_msl(s);
803
const MemoryRegionOps *serial_get_memops(enum device_endian end)
805
return &serial_mm_ops[end];
808
qemu_irq *serial_get_irq(SerialState *s)