/*
* QEMU 16450 UART emulation
- *
+ *
* Copyright (c) 2003-2004 Fabrice Bellard
- *
+ *
* 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
#define UART_LSR_DR 0x01 /* Receiver data ready */
struct SerialState {
- uint8_t divider;
+ uint16_t divider;
uint8_t rbr; /* receive 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;
/* 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;
+ target_phys_addr_t base;
+ int it_shift;
};
static void serial_update_irq(SerialState *s)
s->iir = UART_IIR_NO_INT;
}
if (s->iir != UART_IIR_NO_INT) {
- pic_set_irq(s->irq, 1);
+ qemu_irq_raise(s->irq);
+ } else {
+ qemu_irq_lower(s->irq);
+ }
+}
+
+static void serial_update_parameters(SerialState *s)
+{
+ int speed, parity, data_bits, stop_bits;
+ QEMUSerialSetParams ssp;
+
+ if (s->lcr & 0x08) {
+ 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;
+ if (s->divider == 0)
+ return;
+ speed = 115200 / s->divider;
+ ssp.speed = speed;
+ ssp.parity = parity;
+ ssp.data_bits = data_bits;
+ ssp.stop_bits = stop_bits;
+ qemu_chr_ioctl(s->chr, CHR_IOCTL_SERIAL_SET_PARAMS, &ssp);
+#if 0
+ printf("speed=%d parity=%c data=%d stop=%d\n",
+ speed, parity, data_bits, stop_bits);
+#endif
}
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);
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);
+ qemu_chr_write(s->chr, &ch, 1);
s->thr_ipending = 1;
s->lsr |= UART_LSR_THRE;
s->lsr |= UART_LSR_TEMT;
case 1:
if (s->lcr & UART_LCR_DLAB) {
s->divider = (s->divider & 0x00ff) | (val << 8);
+ serial_update_parameters(s);
} else {
- s->ier = val;
+ s->ier = val & 0x0f;
+ if (s->lsr & UART_LSR_THRE) {
+ s->thr_ipending = 1;
+ }
serial_update_irq(s);
}
break;
case 2:
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;
+ s->mcr = val & 0x1f;
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);
return ret;
}
-int serial_can_receive(SerialState *s)
+static int serial_can_receive(SerialState *s)
{
return !(s->lsr & UART_LSR_DR);
}
-void serial_receive_byte(SerialState *s, int ch)
+static 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;
s->lsr |= UART_LSR_BI | UART_LSR_DR;
serial_receive_byte(s, buf[0]);
}
+static void serial_event(void *opaque, int event)
+{
+ SerialState *s = opaque;
+ if (event == CHR_EVENT_BREAK)
+ serial_receive_break(s);
+}
+
+static void serial_save(QEMUFile *f, void *opaque)
+{
+ SerialState *s = opaque;
+
+ qemu_put_be16s(f,&s->divider);
+ 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;
+
+ if(version_id > 2)
+ return -EINVAL;
+
+ if (version_id >= 2)
+ qemu_get_be16s(f, &s->divider);
+ else
+ s->divider = qemu_get_byte(f);
+ 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;
+}
+
/* If fd is zero, it means that the serial device uses the console */
-SerialState *serial_init(int base, int irq, int fd)
+SerialState *serial_init(int base, qemu_irq irq, CharDriverState *chr)
{
SerialState *s;
s->irq = irq;
s->lsr = UART_LSR_TEMT | UART_LSR_THRE;
s->iir = UART_IIR_NO_INT;
+ s->msr = UART_MSR_DCD | UART_MSR_DSR | UART_MSR_CTS;
+
+ register_savevm("serial", base, 2, serial_save, serial_load, s);
register_ioport_write(base, 8, 1, serial_ioport_write, s);
register_ioport_read(base, 8, 1, serial_ioport_read, s);
+ s->chr = chr;
+ qemu_chr_add_handlers(chr, serial_can_receive1, serial_receive1,
+ serial_event, 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 */
+uint32_t serial_mm_readb (void *opaque, target_phys_addr_t addr)
+{
+ SerialState *s = opaque;
+
+ return serial_ioport_read(s, (addr - s->base) >> s->it_shift) & 0xFF;
+}
+
+void serial_mm_writeb (void *opaque,
+ target_phys_addr_t addr, uint32_t value)
+{
+ SerialState *s = opaque;
+
+ serial_ioport_write(s, (addr - s->base) >> s->it_shift, value & 0xFF);
+}
+
+uint32_t serial_mm_readw (void *opaque, target_phys_addr_t addr)
+{
+ SerialState *s = opaque;
+ uint32_t val;
+
+ val = serial_ioport_read(s, (addr - s->base) >> s->it_shift) & 0xFFFF;
+#ifdef TARGET_WORDS_BIGENDIAN
+ val = bswap16(val);
+#endif
+ return val;
+}
+
+void serial_mm_writew (void *opaque,
+ target_phys_addr_t addr, uint32_t value)
+{
+ SerialState *s = opaque;
+#ifdef TARGET_WORDS_BIGENDIAN
+ value = bswap16(value);
+#endif
+ serial_ioport_write(s, (addr - s->base) >> s->it_shift, value & 0xFFFF);
+}
+
+uint32_t serial_mm_readl (void *opaque, target_phys_addr_t addr)
+{
+ SerialState *s = opaque;
+ uint32_t val;
+
+ val = serial_ioport_read(s, (addr - s->base) >> s->it_shift);
+#ifdef TARGET_WORDS_BIGENDIAN
+ val = bswap32(val);
+#endif
+ return val;
+}
+
+void serial_mm_writel (void *opaque,
+ target_phys_addr_t addr, uint32_t value)
+{
+ SerialState *s = opaque;
+#ifdef TARGET_WORDS_BIGENDIAN
+ value = bswap32(value);
+#endif
+ 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,
+};
+
+SerialState *serial_mm_init (target_phys_addr_t base, int it_shift,
+ qemu_irq irq, CharDriverState *chr,
+ int ioregister)
+{
+ 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;
+ s->msr = UART_MSR_DCD | UART_MSR_DSR | UART_MSR_CTS;
+ s->base = base;
+ s->it_shift = it_shift;
+
+ register_savevm("serial", base, 2, serial_save, serial_load, s);
+
+ 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);
}
+ s->chr = chr;
+ qemu_chr_add_handlers(chr, serial_can_receive1, serial_receive1,
+ serial_event, s);
return s;
}
projects / qemu.git / blobdiff