2004-03-14 13:20:30 +01:00
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/*
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* QEMU 16450 UART emulation
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2007-09-16 23:08:06 +02:00
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*
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2004-03-14 13:20:30 +01:00
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* Copyright (c) 2003-2004 Fabrice Bellard
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2007-09-16 23:08:06 +02:00
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*
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2004-03-14 13:20:30 +01:00
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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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*
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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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*
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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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* THE SOFTWARE.
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*/
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2007-11-17 18:14:51 +01:00
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#include "hw.h"
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#include "qemu-char.h"
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#include "isa.h"
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#include "pc.h"
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2004-03-14 13:20:30 +01:00
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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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/*
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* These are the definitions for the Modem Control Register
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*/
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#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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/*
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* These are the definitions for the Modem Status Register
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*/
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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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2004-03-14 22:46:48 +01:00
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struct SerialState {
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2006-08-26 20:00:36 +02:00
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uint16_t divider;
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2004-03-14 13:20:30 +01:00
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uint8_t rbr; /* receive register */
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uint8_t ier;
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uint8_t iir; /* read only */
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uint8_t lcr;
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uint8_t mcr;
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uint8_t lsr; /* read only */
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2006-04-12 22:42:42 +02:00
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uint8_t msr; /* read only */
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2004-03-14 13:20:30 +01:00
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uint8_t scr;
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/* NOTE: this hidden state is necessary for tx irq generation as
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it can be reset while reading iir */
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int thr_ipending;
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2007-04-07 20:14:41 +02:00
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qemu_irq irq;
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2004-07-14 19:28:13 +02:00
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CharDriverState *chr;
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2005-11-08 23:30:36 +01:00
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int last_break_enable;
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2007-06-08 18:45:23 +02:00
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target_phys_addr_t base;
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2005-11-23 22:11:49 +01:00
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int it_shift;
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2004-03-14 22:46:48 +01:00
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};
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2004-03-14 13:20:30 +01:00
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2004-03-14 22:46:48 +01:00
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static void serial_update_irq(SerialState *s)
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2004-03-14 13:20:30 +01:00
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{
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if ((s->lsr & UART_LSR_DR) && (s->ier & UART_IER_RDI)) {
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s->iir = UART_IIR_RDI;
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} else if (s->thr_ipending && (s->ier & UART_IER_THRI)) {
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s->iir = UART_IIR_THRI;
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} else {
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s->iir = UART_IIR_NO_INT;
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}
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if (s->iir != UART_IIR_NO_INT) {
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2007-04-07 20:14:41 +02:00
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qemu_irq_raise(s->irq);
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2004-03-14 13:20:30 +01:00
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} else {
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2007-04-07 20:14:41 +02:00
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qemu_irq_lower(s->irq);
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2004-03-14 13:20:30 +01:00
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}
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}
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2005-11-08 23:30:36 +01:00
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static void serial_update_parameters(SerialState *s)
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{
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int speed, parity, data_bits, stop_bits;
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2005-11-11 00:58:33 +01:00
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QEMUSerialSetParams ssp;
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2005-11-08 23:30:36 +01:00
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if (s->lcr & 0x08) {
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if (s->lcr & 0x10)
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parity = 'E';
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else
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parity = 'O';
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} else {
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parity = 'N';
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}
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2007-09-16 23:08:06 +02:00
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if (s->lcr & 0x04)
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2005-11-08 23:30:36 +01:00
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stop_bits = 2;
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else
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stop_bits = 1;
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data_bits = (s->lcr & 0x03) + 5;
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if (s->divider == 0)
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return;
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speed = 115200 / s->divider;
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2005-11-11 00:58:33 +01:00
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ssp.speed = speed;
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ssp.parity = parity;
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ssp.data_bits = data_bits;
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ssp.stop_bits = stop_bits;
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qemu_chr_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
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#if 0
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2007-09-16 23:08:06 +02:00
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printf("speed=%d parity=%c data=%d stop=%d\n",
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2005-11-08 23:30:36 +01:00
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speed, parity, data_bits, stop_bits);
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#endif
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}
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2004-03-14 22:46:48 +01:00
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static void serial_ioport_write(void *opaque, uint32_t addr, uint32_t val)
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2004-03-14 13:20:30 +01:00
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{
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2004-03-14 22:46:48 +01:00
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SerialState *s = opaque;
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2004-03-14 13:20:30 +01:00
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unsigned char ch;
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2007-09-17 10:09:54 +02:00
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2004-03-14 13:20:30 +01:00
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addr &= 7;
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#ifdef DEBUG_SERIAL
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printf("serial: write addr=0x%02x val=0x%02x\n", addr, val);
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#endif
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switch(addr) {
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default:
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case 0:
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if (s->lcr & UART_LCR_DLAB) {
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s->divider = (s->divider & 0xff00) | val;
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2005-11-08 23:30:36 +01:00
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serial_update_parameters(s);
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2004-03-14 13:20:30 +01:00
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} else {
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s->thr_ipending = 0;
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s->lsr &= ~UART_LSR_THRE;
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2004-03-14 22:46:48 +01:00
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serial_update_irq(s);
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2004-07-14 19:28:13 +02:00
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ch = val;
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qemu_chr_write(s->chr, &ch, 1);
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2004-03-14 13:20:30 +01:00
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s->thr_ipending = 1;
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s->lsr |= UART_LSR_THRE;
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s->lsr |= UART_LSR_TEMT;
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2004-03-14 22:46:48 +01:00
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serial_update_irq(s);
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2004-03-14 13:20:30 +01:00
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}
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break;
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case 1:
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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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2005-11-08 23:30:36 +01:00
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serial_update_parameters(s);
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2004-03-14 13:20:30 +01:00
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} else {
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2004-08-24 23:55:28 +02:00
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s->ier = val & 0x0f;
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if (s->lsr & UART_LSR_THRE) {
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s->thr_ipending = 1;
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}
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2004-03-14 22:46:48 +01:00
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serial_update_irq(s);
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2004-03-14 13:20:30 +01:00
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}
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break;
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case 2:
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break;
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case 3:
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2005-11-08 23:30:36 +01:00
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{
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int break_enable;
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s->lcr = val;
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serial_update_parameters(s);
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break_enable = (val >> 6) & 1;
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if (break_enable != s->last_break_enable) {
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s->last_break_enable = break_enable;
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2007-09-16 23:08:06 +02:00
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qemu_chr_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_BREAK,
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2005-11-11 00:58:33 +01:00
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&break_enable);
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2005-11-08 23:30:36 +01:00
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}
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}
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2004-03-14 13:20:30 +01:00
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break;
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case 4:
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2004-08-24 23:55:28 +02:00
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s->mcr = val & 0x1f;
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2004-03-14 13:20:30 +01:00
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break;
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case 5:
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break;
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case 6:
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break;
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case 7:
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s->scr = val;
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break;
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}
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}
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2004-03-14 22:46:48 +01:00
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static uint32_t serial_ioport_read(void *opaque, uint32_t addr)
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2004-03-14 13:20:30 +01:00
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{
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2004-03-14 22:46:48 +01:00
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SerialState *s = opaque;
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2004-03-14 13:20:30 +01:00
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uint32_t ret;
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addr &= 7;
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switch(addr) {
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default:
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case 0:
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if (s->lcr & UART_LCR_DLAB) {
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2007-09-16 23:08:06 +02:00
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ret = s->divider & 0xff;
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2004-03-14 13:20:30 +01:00
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} else {
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ret = s->rbr;
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s->lsr &= ~(UART_LSR_DR | UART_LSR_BI);
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2004-03-14 22:46:48 +01:00
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serial_update_irq(s);
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2007-11-25 01:55:06 +01:00
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qemu_chr_accept_input(s->chr);
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2004-03-14 13:20:30 +01:00
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}
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break;
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case 1:
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if (s->lcr & UART_LCR_DLAB) {
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ret = (s->divider >> 8) & 0xff;
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} else {
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ret = s->ier;
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}
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break;
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case 2:
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ret = s->iir;
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/* reset THR pending bit */
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if ((ret & 0x7) == UART_IIR_THRI)
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s->thr_ipending = 0;
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2004-03-14 22:46:48 +01:00
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serial_update_irq(s);
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2004-03-14 13:20:30 +01:00
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break;
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case 3:
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ret = s->lcr;
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break;
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case 4:
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ret = s->mcr;
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break;
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case 5:
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ret = s->lsr;
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break;
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case 6:
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if (s->mcr & UART_MCR_LOOP) {
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/* in loopback, the modem output pins are connected to the
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inputs */
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ret = (s->mcr & 0x0c) << 4;
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ret |= (s->mcr & 0x02) << 3;
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ret |= (s->mcr & 0x01) << 5;
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} else {
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ret = s->msr;
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}
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break;
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case 7:
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ret = s->scr;
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break;
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}
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#ifdef DEBUG_SERIAL
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printf("serial: read addr=0x%02x val=0x%02x\n", addr, ret);
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#endif
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return ret;
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}
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2004-07-14 19:28:13 +02:00
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static int serial_can_receive(SerialState *s)
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2004-03-14 13:20:30 +01:00
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{
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return !(s->lsr & UART_LSR_DR);
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}
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2004-07-14 19:28:13 +02:00
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static void serial_receive_byte(SerialState *s, int ch)
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2004-03-14 13:20:30 +01:00
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{
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s->rbr = ch;
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s->lsr |= UART_LSR_DR;
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2004-03-14 22:46:48 +01:00
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serial_update_irq(s);
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2004-03-14 13:20:30 +01:00
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}
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2004-07-14 19:28:13 +02:00
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static void serial_receive_break(SerialState *s)
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2004-03-14 13:20:30 +01:00
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{
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s->rbr = 0;
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s->lsr |= UART_LSR_BI | UART_LSR_DR;
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2004-03-14 22:46:48 +01:00
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serial_update_irq(s);
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2004-03-14 13:20:30 +01:00
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}
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2004-03-14 22:46:48 +01:00
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static int serial_can_receive1(void *opaque)
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2004-03-14 13:20:30 +01:00
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{
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2004-03-14 22:46:48 +01:00
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SerialState *s = opaque;
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return serial_can_receive(s);
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}
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static void serial_receive1(void *opaque, const uint8_t *buf, int size)
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{
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SerialState *s = opaque;
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serial_receive_byte(s, buf[0]);
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}
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2004-03-14 13:20:30 +01:00
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2004-07-14 19:28:13 +02:00
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static void serial_event(void *opaque, int event)
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{
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SerialState *s = opaque;
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|
|
if (event == CHR_EVENT_BREAK)
|
|
|
|
serial_receive_break(s);
|
|
|
|
}
|
|
|
|
|
2005-11-06 16:48:04 +01:00
|
|
|
static void serial_save(QEMUFile *f, void *opaque)
|
|
|
|
{
|
|
|
|
SerialState *s = opaque;
|
|
|
|
|
2006-08-26 20:00:36 +02:00
|
|
|
qemu_put_be16s(f,&s->divider);
|
2005-11-06 16:48:04 +01:00
|
|
|
qemu_put_8s(f,&s->rbr);
|
|
|
|
qemu_put_8s(f,&s->ier);
|
|
|
|
qemu_put_8s(f,&s->iir);
|
|
|
|
qemu_put_8s(f,&s->lcr);
|
|
|
|
qemu_put_8s(f,&s->mcr);
|
|
|
|
qemu_put_8s(f,&s->lsr);
|
|
|
|
qemu_put_8s(f,&s->msr);
|
|
|
|
qemu_put_8s(f,&s->scr);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int serial_load(QEMUFile *f, void *opaque, int version_id)
|
|
|
|
{
|
|
|
|
SerialState *s = opaque;
|
|
|
|
|
2006-08-26 20:00:36 +02:00
|
|
|
if(version_id > 2)
|
2005-11-06 16:48:04 +01:00
|
|
|
return -EINVAL;
|
|
|
|
|
2006-08-26 20:00:36 +02:00
|
|
|
if (version_id >= 2)
|
|
|
|
qemu_get_be16s(f, &s->divider);
|
|
|
|
else
|
|
|
|
s->divider = qemu_get_byte(f);
|
2005-11-06 16:48:04 +01:00
|
|
|
qemu_get_8s(f,&s->rbr);
|
|
|
|
qemu_get_8s(f,&s->ier);
|
|
|
|
qemu_get_8s(f,&s->iir);
|
|
|
|
qemu_get_8s(f,&s->lcr);
|
|
|
|
qemu_get_8s(f,&s->mcr);
|
|
|
|
qemu_get_8s(f,&s->lsr);
|
|
|
|
qemu_get_8s(f,&s->msr);
|
|
|
|
qemu_get_8s(f,&s->scr);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2004-03-14 22:46:48 +01:00
|
|
|
/* If fd is zero, it means that the serial device uses the console */
|
2007-04-07 20:14:41 +02:00
|
|
|
SerialState *serial_init(int base, qemu_irq irq, CharDriverState *chr)
|
2004-03-14 22:46:48 +01:00
|
|
|
{
|
|
|
|
SerialState *s;
|
|
|
|
|
|
|
|
s = qemu_mallocz(sizeof(SerialState));
|
|
|
|
if (!s)
|
|
|
|
return NULL;
|
2004-03-14 13:20:30 +01:00
|
|
|
s->irq = irq;
|
|
|
|
s->lsr = UART_LSR_TEMT | UART_LSR_THRE;
|
|
|
|
s->iir = UART_IIR_NO_INT;
|
2006-04-12 22:42:42 +02:00
|
|
|
s->msr = UART_MSR_DCD | UART_MSR_DSR | UART_MSR_CTS;
|
2004-03-14 22:46:48 +01:00
|
|
|
|
2006-08-26 20:00:36 +02:00
|
|
|
register_savevm("serial", base, 2, serial_save, serial_load, s);
|
2005-11-06 16:48:04 +01:00
|
|
|
|
2004-03-14 22:46:48 +01:00
|
|
|
register_ioport_write(base, 8, 1, serial_ioport_write, s);
|
|
|
|
register_ioport_read(base, 8, 1, serial_ioport_read, s);
|
2004-07-14 19:28:13 +02:00
|
|
|
s->chr = chr;
|
2007-01-28 00:46:43 +01:00
|
|
|
qemu_chr_add_handlers(chr, serial_can_receive1, serial_receive1,
|
|
|
|
serial_event, s);
|
2004-03-14 22:46:48 +01:00
|
|
|
return s;
|
2004-03-14 13:20:30 +01:00
|
|
|
}
|
2005-11-23 22:11:49 +01:00
|
|
|
|
|
|
|
/* Memory mapped interface */
|
2007-03-31 18:54:14 +02:00
|
|
|
uint32_t serial_mm_readb (void *opaque, target_phys_addr_t addr)
|
2005-11-23 22:11:49 +01:00
|
|
|
{
|
|
|
|
SerialState *s = opaque;
|
|
|
|
|
|
|
|
return serial_ioport_read(s, (addr - s->base) >> s->it_shift) & 0xFF;
|
|
|
|
}
|
|
|
|
|
2007-03-31 18:54:14 +02:00
|
|
|
void serial_mm_writeb (void *opaque,
|
|
|
|
target_phys_addr_t addr, uint32_t value)
|
2005-11-23 22:11:49 +01:00
|
|
|
{
|
|
|
|
SerialState *s = opaque;
|
|
|
|
|
|
|
|
serial_ioport_write(s, (addr - s->base) >> s->it_shift, value & 0xFF);
|
|
|
|
}
|
|
|
|
|
2007-03-31 18:54:14 +02:00
|
|
|
uint32_t serial_mm_readw (void *opaque, target_phys_addr_t addr)
|
2005-11-23 22:11:49 +01:00
|
|
|
{
|
|
|
|
SerialState *s = opaque;
|
2007-06-06 18:28:07 +02:00
|
|
|
uint32_t val;
|
2005-11-23 22:11:49 +01:00
|
|
|
|
2007-06-06 18:28:07 +02:00
|
|
|
val = serial_ioport_read(s, (addr - s->base) >> s->it_shift) & 0xFFFF;
|
|
|
|
#ifdef TARGET_WORDS_BIGENDIAN
|
|
|
|
val = bswap16(val);
|
|
|
|
#endif
|
|
|
|
return val;
|
2005-11-23 22:11:49 +01:00
|
|
|
}
|
|
|
|
|
2007-03-31 18:54:14 +02:00
|
|
|
void serial_mm_writew (void *opaque,
|
|
|
|
target_phys_addr_t addr, uint32_t value)
|
2005-11-23 22:11:49 +01:00
|
|
|
{
|
|
|
|
SerialState *s = opaque;
|
2007-06-06 18:28:07 +02:00
|
|
|
#ifdef TARGET_WORDS_BIGENDIAN
|
|
|
|
value = bswap16(value);
|
|
|
|
#endif
|
2005-11-23 22:11:49 +01:00
|
|
|
serial_ioport_write(s, (addr - s->base) >> s->it_shift, value & 0xFFFF);
|
|
|
|
}
|
|
|
|
|
2007-03-31 18:54:14 +02:00
|
|
|
uint32_t serial_mm_readl (void *opaque, target_phys_addr_t addr)
|
2005-11-23 22:11:49 +01:00
|
|
|
{
|
|
|
|
SerialState *s = opaque;
|
2007-06-06 18:28:07 +02:00
|
|
|
uint32_t val;
|
2005-11-23 22:11:49 +01:00
|
|
|
|
2007-06-06 18:28:07 +02:00
|
|
|
val = serial_ioport_read(s, (addr - s->base) >> s->it_shift);
|
|
|
|
#ifdef TARGET_WORDS_BIGENDIAN
|
|
|
|
val = bswap32(val);
|
|
|
|
#endif
|
|
|
|
return val;
|
2005-11-23 22:11:49 +01:00
|
|
|
}
|
|
|
|
|
2007-03-31 18:54:14 +02:00
|
|
|
void serial_mm_writel (void *opaque,
|
|
|
|
target_phys_addr_t addr, uint32_t value)
|
2005-11-23 22:11:49 +01:00
|
|
|
{
|
|
|
|
SerialState *s = opaque;
|
2007-06-06 18:28:07 +02:00
|
|
|
#ifdef TARGET_WORDS_BIGENDIAN
|
|
|
|
value = bswap32(value);
|
|
|
|
#endif
|
2005-11-23 22:11:49 +01:00
|
|
|
serial_ioport_write(s, (addr - s->base) >> s->it_shift, value);
|
|
|
|
}
|
|
|
|
|
|
|
|
static CPUReadMemoryFunc *serial_mm_read[] = {
|
|
|
|
&serial_mm_readb,
|
|
|
|
&serial_mm_readw,
|
|
|
|
&serial_mm_readl,
|
|
|
|
};
|
|
|
|
|
|
|
|
static CPUWriteMemoryFunc *serial_mm_write[] = {
|
|
|
|
&serial_mm_writeb,
|
|
|
|
&serial_mm_writew,
|
|
|
|
&serial_mm_writel,
|
|
|
|
};
|
|
|
|
|
2007-06-08 18:45:23 +02:00
|
|
|
SerialState *serial_mm_init (target_phys_addr_t base, int it_shift,
|
2007-04-07 20:14:41 +02:00
|
|
|
qemu_irq irq, CharDriverState *chr,
|
2007-03-31 18:54:14 +02:00
|
|
|
int ioregister)
|
2005-11-23 22:11:49 +01:00
|
|
|
{
|
|
|
|
SerialState *s;
|
|
|
|
int s_io_memory;
|
|
|
|
|
|
|
|
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;
|
2006-04-12 22:42:42 +02:00
|
|
|
s->msr = UART_MSR_DCD | UART_MSR_DSR | UART_MSR_CTS;
|
2005-11-23 22:11:49 +01:00
|
|
|
s->base = base;
|
|
|
|
s->it_shift = it_shift;
|
|
|
|
|
2006-08-26 20:00:36 +02:00
|
|
|
register_savevm("serial", base, 2, serial_save, serial_load, s);
|
2005-11-23 22:11:49 +01:00
|
|
|
|
2007-03-31 18:54:14 +02:00
|
|
|
if (ioregister) {
|
|
|
|
s_io_memory = cpu_register_io_memory(0, serial_mm_read,
|
|
|
|
serial_mm_write, s);
|
|
|
|
cpu_register_physical_memory(base, 8 << it_shift, s_io_memory);
|
|
|
|
}
|
2005-11-23 22:11:49 +01:00
|
|
|
s->chr = chr;
|
2007-01-28 00:46:43 +01:00
|
|
|
qemu_chr_add_handlers(chr, serial_can_receive1, serial_receive1,
|
|
|
|
serial_event, s);
|
2005-11-23 22:11:49 +01:00
|
|
|
return s;
|
|
|
|
}
|