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low level host parallel port access

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1611 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2005-11-10 23:58:52 +00:00
parent 2122c51a9c
commit e57a8c0eef
4 changed files with 171 additions and 65 deletions
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94
hw/parallel.c
View file

@ -1,7 +1,7 @@
/*
* QEMU Parallel PORT emulation
*
* Copyright (c) 2003-2004 Fabrice Bellard
* Copyright (c) 2003-2005 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
@ -50,6 +50,7 @@ struct ParallelState {
int irq;
int irq_pending;
CharDriverState *chr;
int hw_driver;
};
static void parallel_update_irq(ParallelState *s)
@ -70,29 +71,39 @@ static void parallel_ioport_write(void *opaque, uint32_t addr, uint32_t val)
#endif
switch(addr) {
case 0:
s->data = val;
parallel_update_irq(s);
if (s->hw_driver) {
s->data = val;
qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_WRITE_DATA, &s->data);
} else {
s->data = val;
parallel_update_irq(s);
}
break;
case 2:
if ((val & PARA_CTR_INIT) == 0 ) {
s->status = PARA_STS_BUSY;
s->status |= PARA_STS_ACK;
s->status |= PARA_STS_ONLINE;
s->status |= PARA_STS_ERROR;
}
else if (val & PARA_CTR_SELECT) {
if (val & PARA_CTR_STROBE) {
s->status &= ~PARA_STS_BUSY;
if ((s->control & PARA_CTR_STROBE) == 0)
qemu_chr_write(s->chr, &s->data, 1);
} else {
if (s->control & PARA_CTR_INTEN) {
s->irq_pending = 1;
if (s->hw_driver) {
s->control = val;
qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_WRITE_CONTROL, &s->control);
} else {
if ((val & PARA_CTR_INIT) == 0 ) {
s->status = PARA_STS_BUSY;
s->status |= PARA_STS_ACK;
s->status |= PARA_STS_ONLINE;
s->status |= PARA_STS_ERROR;
}
else if (val & PARA_CTR_SELECT) {
if (val & PARA_CTR_STROBE) {
s->status &= ~PARA_STS_BUSY;
if ((s->control & PARA_CTR_STROBE) == 0)
qemu_chr_write(s->chr, &s->data, 1);
} else {
if (s->control & PARA_CTR_INTEN) {
s->irq_pending = 1;
}
}
}
parallel_update_irq(s);
s->control = val;
}
parallel_update_irq(s);
s->control = val;
break;
}
}
@ -105,24 +116,35 @@ static uint32_t parallel_ioport_read(void *opaque, uint32_t addr)
addr &= 7;
switch(addr) {
case 0:
if (s->hw_driver) {
qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_READ_DATA, &s->data);
}
ret = s->data;
break;
case 1:
ret = s->status;
s->irq_pending = 0;
if ((s->status & PARA_STS_BUSY) == 0 && (s->control & PARA_CTR_STROBE) == 0) {
/* XXX Fixme: wait 5 microseconds */
if (s->status & PARA_STS_ACK)
s->status &= ~PARA_STS_ACK;
else {
/* XXX Fixme: wait 5 microseconds */
s->status |= PARA_STS_ACK;
s->status |= PARA_STS_BUSY;
if (s->hw_driver) {
qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_READ_STATUS, &s->status);
ret = s->status;
} else {
ret = s->status;
s->irq_pending = 0;
if ((s->status & PARA_STS_BUSY) == 0 && (s->control & PARA_CTR_STROBE) == 0) {
/* XXX Fixme: wait 5 microseconds */
if (s->status & PARA_STS_ACK)
s->status &= ~PARA_STS_ACK;
else {
/* XXX Fixme: wait 5 microseconds */
s->status |= PARA_STS_ACK;
s->status |= PARA_STS_BUSY;
}
}
parallel_update_irq(s);
}
parallel_update_irq(s);
break;
case 2:
if (s->hw_driver) {
qemu_chr_ioctl(s->chr, CHR_IOCTL_PP_READ_CONTROL, &s->control);
}
ret = s->control;
break;
}
@ -153,18 +175,20 @@ static void parallel_receive1(void *opaque, const uint8_t *buf, int size)
parallel_receive_byte(s, buf[0]);
}
static void parallel_event(void *opaque, int event)
{
}
/* If fd is zero, it means that the parallel device uses the console */
ParallelState *parallel_init(int base, int irq, CharDriverState *chr)
{
ParallelState *s;
uint8_t dummy;
s = qemu_mallocz(sizeof(ParallelState));
if (!s)
return NULL;
s->chr = chr;
s->hw_driver = 0;
if (qemu_chr_ioctl(chr, CHR_IOCTL_PP_READ_STATUS, &dummy) == 0)
s->hw_driver = 1;
s->irq = irq;
s->data = 0;
s->status = PARA_STS_BUSY;
@ -176,8 +200,6 @@ ParallelState *parallel_init(int base, int irq, CharDriverState *chr)
register_ioport_write(base, 8, 1, parallel_ioport_write, s);
register_ioport_read(base, 8, 1, parallel_ioport_read, s);
s->chr = chr;
qemu_chr_add_read_handler(chr, parallel_can_receive1, parallel_receive1, s);
qemu_chr_add_event_handler(chr, parallel_event);
return s;
}