2
* 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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#include "qemu/error-report.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
56
#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 inline void recv_fifo_put(SerialState *s, uint8_t chr)
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/* Receive overruns do not overwrite FIFO contents. */
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if (!fifo8_is_full(&s->recv_fifo)) {
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fifo8_push(&s->recv_fifo, chr);
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s->lsr |= UART_LSR_OE;
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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.num >= 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;
151
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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timer_del(s->modem_status_poll);
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if (qemu_chr_fe_ioctl(s->chr,CHR_IOCTL_SERIAL_GET_TIOCM, &flags) == -ENOTSUP) {
201
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);
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/* 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 */
219
timer_mod(s->modem_status_poll, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + get_ticks_per_sec() / 100);
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static gboolean serial_xmit(GIOChannel *chan, GIOCondition cond, void *opaque)
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SerialState *s = opaque;
226
if (s->tsr_retry <= 0) {
227
if (s->fcr & UART_FCR_FE) {
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s->tsr = fifo8_is_full(&s->xmit_fifo) ?
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0 : fifo8_pop(&s->xmit_fifo);
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if (!s->xmit_fifo.num) {
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s->lsr |= UART_LSR_THRE;
233
} else if ((s->lsr & UART_LSR_THRE)) {
237
s->lsr |= UART_LSR_THRE;
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s->lsr &= ~UART_LSR_TEMT;
242
if (s->mcr & UART_MCR_LOOP) {
243
/* in loopback mode, say that we just received a char */
244
serial_receive1(s, &s->tsr, 1);
245
} else if (qemu_chr_fe_write(s->chr, &s->tsr, 1) != 1) {
246
if (s->tsr_retry >= 0 && s->tsr_retry < MAX_XMIT_RETRY &&
247
qemu_chr_fe_add_watch(s->chr, G_IO_OUT, serial_xmit, s) > 0) {
256
s->last_xmit_ts = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
258
if (s->lsr & UART_LSR_THRE) {
259
s->lsr |= UART_LSR_TEMT;
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serial_update_irq(s);
268
static void serial_ioport_write(void *opaque, hwaddr addr, uint64_t val,
271
SerialState *s = opaque;
274
DPRINTF("write addr=0x%" HWADDR_PRIx " val=0x%" PRIx64 "\n", addr, val);
278
if (s->lcr & UART_LCR_DLAB) {
279
s->divider = (s->divider & 0xff00) | val;
280
serial_update_parameters(s);
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s->thr = (uint8_t) val;
283
if(s->fcr & UART_FCR_FE) {
284
/* xmit overruns overwrite data, so make space if needed */
285
if (fifo8_is_full(&s->xmit_fifo)) {
286
fifo8_pop(&s->xmit_fifo);
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fifo8_push(&s->xmit_fifo, s->thr);
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s->lsr &= ~UART_LSR_TEMT;
292
s->lsr &= ~UART_LSR_THRE;
293
serial_update_irq(s);
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serial_xmit(NULL, G_IO_OUT, s);
298
if (s->lcr & UART_LCR_DLAB) {
299
s->divider = (s->divider & 0x00ff) | (val << 8);
300
serial_update_parameters(s);
303
/* If the backend device is a real serial port, turn polling of the modem
304
status lines on physical port on or off depending on UART_IER_MSI state */
305
if (s->poll_msl >= 0) {
306
if (s->ier & UART_IER_MSI) {
308
serial_update_msl(s);
310
timer_del(s->modem_status_poll);
314
if (s->lsr & UART_LSR_THRE) {
316
serial_update_irq(s);
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/* Did the enable/disable flag change? If so, make sure FIFOs get flushed */
327
if ((val ^ s->fcr) & UART_FCR_FE)
328
val |= UART_FCR_XFR | UART_FCR_RFR;
332
if (val & UART_FCR_RFR) {
333
timer_del(s->fifo_timeout_timer);
334
s->timeout_ipending=0;
335
fifo8_reset(&s->recv_fifo);
336
if ((s->lsr & UART_LSR_DR)) {
337
s->lsr &= ~(UART_LSR_DR | UART_LSR_BI | UART_LSR_OE);
338
if (!(s->mcr & UART_MCR_LOOP)) {
339
qemu_chr_accept_input(s->chr);
344
if (val & UART_FCR_XFR) {
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fifo8_reset(&s->xmit_fifo);
346
s->lsr |= UART_LSR_THRE;
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if (val & UART_FCR_FE) {
350
s->iir |= UART_IIR_FE;
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/* Set recv_fifo trigger Level */
352
switch (val & 0xC0) {
354
s->recv_fifo_itl = 1;
357
s->recv_fifo_itl = 4;
360
s->recv_fifo_itl = 8;
363
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" */
371
serial_update_irq(s);
377
serial_update_parameters(s);
378
break_enable = (val >> 6) & 1;
379
if (break_enable != s->last_break_enable) {
380
s->last_break_enable = break_enable;
381
qemu_chr_fe_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_BREAK,
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int old_mcr = s->mcr;
391
if (val & UART_MCR_LOOP)
394
if (s->poll_msl >= 0 && old_mcr != s->mcr) {
396
qemu_chr_fe_ioctl(s->chr,CHR_IOCTL_SERIAL_GET_TIOCM, &flags);
398
flags &= ~(CHR_TIOCM_RTS | CHR_TIOCM_DTR);
400
if (val & UART_MCR_RTS)
401
flags |= CHR_TIOCM_RTS;
402
if (val & UART_MCR_DTR)
403
flags |= CHR_TIOCM_DTR;
405
qemu_chr_fe_ioctl(s->chr,CHR_IOCTL_SERIAL_SET_TIOCM, &flags);
406
/* Update the modem status after a one-character-send wait-time, since there may be a response
407
from the device/computer at the other end of the serial line */
408
timer_mod(s->modem_status_poll, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->char_transmit_time);
422
static uint64_t serial_ioport_read(void *opaque, hwaddr addr, unsigned size)
424
SerialState *s = opaque;
431
if (s->lcr & UART_LCR_DLAB) {
432
ret = s->divider & 0xff;
434
if(s->fcr & UART_FCR_FE) {
435
ret = fifo8_is_empty(&s->recv_fifo) ?
436
0 : fifo8_pop(&s->recv_fifo);
437
if (s->recv_fifo.num == 0) {
438
s->lsr &= ~(UART_LSR_DR | UART_LSR_BI);
440
timer_mod(s->fifo_timeout_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->char_transmit_time * 4);
442
s->timeout_ipending = 0;
445
s->lsr &= ~(UART_LSR_DR | UART_LSR_BI);
447
serial_update_irq(s);
448
if (!(s->mcr & UART_MCR_LOOP)) {
449
/* in loopback mode, don't receive any data */
450
qemu_chr_accept_input(s->chr);
455
if (s->lcr & UART_LCR_DLAB) {
456
ret = (s->divider >> 8) & 0xff;
463
if ((ret & UART_IIR_ID) == UART_IIR_THRI) {
465
serial_update_irq(s);
476
/* Clear break and overrun interrupts */
477
if (s->lsr & (UART_LSR_BI|UART_LSR_OE)) {
478
s->lsr &= ~(UART_LSR_BI|UART_LSR_OE);
479
serial_update_irq(s);
483
if (s->mcr & UART_MCR_LOOP) {
484
/* in loopback, the modem output pins are connected to the
486
ret = (s->mcr & 0x0c) << 4;
487
ret |= (s->mcr & 0x02) << 3;
488
ret |= (s->mcr & 0x01) << 5;
490
if (s->poll_msl >= 0)
491
serial_update_msl(s);
493
/* Clear delta bits & msr int after read, if they were set */
494
if (s->msr & UART_MSR_ANY_DELTA) {
496
serial_update_irq(s);
504
DPRINTF("read addr=0x%" HWADDR_PRIx " val=0x%02x\n", addr, ret);
508
static int serial_can_receive(SerialState *s)
510
if(s->fcr & UART_FCR_FE) {
511
if (s->recv_fifo.num < UART_FIFO_LENGTH) {
513
* Advertise (fifo.itl - fifo.count) bytes when count < ITL, and 1
514
* if above. If UART_FIFO_LENGTH - fifo.count is advertised the
515
* effect will be to almost always fill the fifo completely before
516
* the guest has a chance to respond, effectively overriding the ITL
517
* that the guest has set.
519
return (s->recv_fifo.num <= s->recv_fifo_itl) ?
520
s->recv_fifo_itl - s->recv_fifo.num : 1;
525
return !(s->lsr & UART_LSR_DR);
529
static void serial_receive_break(SerialState *s)
532
/* When the LSR_DR is set a null byte is pushed into the fifo */
533
recv_fifo_put(s, '\0');
534
s->lsr |= UART_LSR_BI | UART_LSR_DR;
535
serial_update_irq(s);
538
/* There's data in recv_fifo and s->rbr has not been read for 4 char transmit times */
539
static void fifo_timeout_int (void *opaque) {
540
SerialState *s = opaque;
541
if (s->recv_fifo.num) {
542
s->timeout_ipending = 1;
543
serial_update_irq(s);
547
static int serial_can_receive1(void *opaque)
549
SerialState *s = opaque;
550
return serial_can_receive(s);
553
static void serial_receive1(void *opaque, const uint8_t *buf, int size)
555
SerialState *s = opaque;
558
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
560
if(s->fcr & UART_FCR_FE) {
562
for (i = 0; i < size; i++) {
563
recv_fifo_put(s, buf[i]);
565
s->lsr |= UART_LSR_DR;
566
/* call the timeout receive callback in 4 char transmit time */
567
timer_mod(s->fifo_timeout_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->char_transmit_time * 4);
569
if (s->lsr & UART_LSR_DR)
570
s->lsr |= UART_LSR_OE;
572
s->lsr |= UART_LSR_DR;
574
serial_update_irq(s);
577
static void serial_event(void *opaque, int event)
579
SerialState *s = opaque;
580
DPRINTF("event %x\n", event);
581
if (event == CHR_EVENT_BREAK)
582
serial_receive_break(s);
585
static void serial_pre_save(void *opaque)
587
SerialState *s = opaque;
588
s->fcr_vmstate = s->fcr;
591
static int serial_post_load(void *opaque, int version_id)
593
SerialState *s = opaque;
595
if (version_id < 3) {
598
/* Initialize fcr via setter to perform essential side-effects */
599
serial_ioport_write(s, 0x02, s->fcr_vmstate, 1);
600
serial_update_parameters(s);
604
const VMStateDescription vmstate_serial = {
607
.minimum_version_id = 2,
608
.pre_save = serial_pre_save,
609
.post_load = serial_post_load,
610
.fields = (VMStateField []) {
611
VMSTATE_UINT16_V(divider, SerialState, 2),
612
VMSTATE_UINT8(rbr, SerialState),
613
VMSTATE_UINT8(ier, SerialState),
614
VMSTATE_UINT8(iir, SerialState),
615
VMSTATE_UINT8(lcr, SerialState),
616
VMSTATE_UINT8(mcr, SerialState),
617
VMSTATE_UINT8(lsr, SerialState),
618
VMSTATE_UINT8(msr, SerialState),
619
VMSTATE_UINT8(scr, SerialState),
620
VMSTATE_UINT8_V(fcr_vmstate, SerialState, 3),
621
VMSTATE_END_OF_LIST()
625
static void serial_reset(void *opaque)
627
SerialState *s = opaque;
631
s->iir = UART_IIR_NO_INT;
633
s->lsr = UART_LSR_TEMT | UART_LSR_THRE;
634
s->msr = UART_MSR_DCD | UART_MSR_DSR | UART_MSR_CTS;
635
/* Default to 9600 baud, 1 start bit, 8 data bits, 1 stop bit, no parity. */
637
s->mcr = UART_MCR_OUT2;
640
s->char_transmit_time = (get_ticks_per_sec() / 9600) * 10;
643
fifo8_reset(&s->recv_fifo);
644
fifo8_reset(&s->xmit_fifo);
646
s->last_xmit_ts = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
649
s->last_break_enable = 0;
650
qemu_irq_lower(s->irq);
653
void serial_realize_core(SerialState *s, Error **errp)
656
error_setg(errp, "Can't create serial device, empty char device");
660
s->modem_status_poll = timer_new_ns(QEMU_CLOCK_VIRTUAL, (QEMUTimerCB *) serial_update_msl, s);
662
s->fifo_timeout_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, (QEMUTimerCB *) fifo_timeout_int, s);
663
qemu_register_reset(serial_reset, s);
665
qemu_chr_add_handlers(s->chr, serial_can_receive1, serial_receive1,
667
fifo8_create(&s->recv_fifo, UART_FIFO_LENGTH);
668
fifo8_create(&s->xmit_fifo, UART_FIFO_LENGTH);
671
void serial_exit_core(SerialState *s)
673
qemu_chr_add_handlers(s->chr, NULL, NULL, NULL, NULL);
674
qemu_unregister_reset(serial_reset, s);
677
/* Change the main reference oscillator frequency. */
678
void serial_set_frequency(SerialState *s, uint32_t frequency)
680
s->baudbase = frequency;
681
serial_update_parameters(s);
684
const MemoryRegionOps serial_io_ops = {
685
.read = serial_ioport_read,
686
.write = serial_ioport_write,
688
.min_access_size = 1,
689
.max_access_size = 1,
691
.endianness = DEVICE_LITTLE_ENDIAN,
694
SerialState *serial_init(int base, qemu_irq irq, int baudbase,
695
CharDriverState *chr, MemoryRegion *system_io)
700
s = g_malloc0(sizeof(SerialState));
703
s->baudbase = baudbase;
705
serial_realize_core(s, &err);
707
error_report("%s", error_get_pretty(err));
712
vmstate_register(NULL, base, &vmstate_serial, s);
714
memory_region_init_io(&s->io, NULL, &serial_io_ops, s, "serial", 8);
715
memory_region_add_subregion(system_io, base, &s->io);
720
/* Memory mapped interface */
721
static uint64_t serial_mm_read(void *opaque, hwaddr addr,
724
SerialState *s = opaque;
725
return serial_ioport_read(s, addr >> s->it_shift, 1);
728
static void serial_mm_write(void *opaque, hwaddr addr,
729
uint64_t value, unsigned size)
731
SerialState *s = opaque;
732
value &= ~0u >> (32 - (size * 8));
733
serial_ioport_write(s, addr >> s->it_shift, value, 1);
736
static const MemoryRegionOps serial_mm_ops[3] = {
737
[DEVICE_NATIVE_ENDIAN] = {
738
.read = serial_mm_read,
739
.write = serial_mm_write,
740
.endianness = DEVICE_NATIVE_ENDIAN,
742
[DEVICE_LITTLE_ENDIAN] = {
743
.read = serial_mm_read,
744
.write = serial_mm_write,
745
.endianness = DEVICE_LITTLE_ENDIAN,
747
[DEVICE_BIG_ENDIAN] = {
748
.read = serial_mm_read,
749
.write = serial_mm_write,
750
.endianness = DEVICE_BIG_ENDIAN,
754
SerialState *serial_mm_init(MemoryRegion *address_space,
755
hwaddr base, int it_shift,
756
qemu_irq irq, int baudbase,
757
CharDriverState *chr, enum device_endian end)
762
s = g_malloc0(sizeof(SerialState));
764
s->it_shift = it_shift;
766
s->baudbase = baudbase;
769
serial_realize_core(s, &err);
771
error_report("%s", error_get_pretty(err));
775
vmstate_register(NULL, base, &vmstate_serial, s);
778
memory_region_init_io(&s->io, NULL, &serial_mm_ops[end], s,
779
"serial", 8 << it_shift);
780
memory_region_add_subregion(address_space, base, &s->io);
783
serial_update_msl(s);
787
void serial_change_char_driver(SerialState *s, CharDriverState *chr)
789
/* TODO this is somewhat guesswork, and pretty ugly anyhow */
790
qemu_chr_add_handlers(s->chr, NULL, NULL, NULL, NULL);
792
qemu_chr_add_handlers(s->chr, serial_can_receive1, serial_receive1,
794
serial_update_msl(s);
797
const MemoryRegionOps *serial_get_memops(enum device_endian end)
799
return &serial_mm_ops[end];
802
qemu_irq *serial_get_irq(SerialState *s)