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/*
* QEMU IRQ/GPIO common code.
*
* Copyright (c) 2007 CodeSourcery.
*
* 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
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu-common.h"
#include "hw/irq.h"
struct IRQState {
qemu_irq_handler handler;
void *opaque;
int n;
};
void qemu_set_irq(qemu_irq irq, int level)
{
if (!irq)
return;
irq->handler(irq->opaque, irq->n, level);
}
qemu_irq *qemu_extend_irqs(qemu_irq *old, int n_old, qemu_irq_handler handler,
void *opaque, int n)
{
qemu_irq *s;
struct IRQState *p;
int i;
if (!old) {
n_old = 0;
}
s = old ? g_renew(qemu_irq, old, n + n_old) : g_new(qemu_irq, n);
p = old ? g_renew(struct IRQState, s[0], n + n_old) :
g_new(struct IRQState, n);
for (i = 0; i < n + n_old; i++) {
if (i >= n_old) {
p->handler = handler;
p->opaque = opaque;
p->n = i;
}
s[i] = p;
p++;
}
return s;
}
qemu_irq *qemu_allocate_irqs(qemu_irq_handler handler, void *opaque, int n)
{
return qemu_extend_irqs(NULL, 0, handler, opaque, n);
}
qemu_irq qemu_allocate_irq(qemu_irq_handler handler, void *opaque, int n)
{
struct IRQState *irq;
irq = g_new(struct IRQState, 1);
irq->handler = handler;
irq->opaque = opaque;
irq->n = n;
return irq;
}
void qemu_free_irqs(qemu_irq *s)
{
g_free(s[0]);
g_free(s);
}
void qemu_free_irq(qemu_irq irq)
{
g_free(irq);
}
static void qemu_notirq(void *opaque, int line, int level)
{
struct IRQState *irq = opaque;
irq->handler(irq->opaque, irq->n, !level);
}
qemu_irq qemu_irq_invert(qemu_irq irq)
{
/* The default state for IRQs is low, so raise the output now. */
qemu_irq_raise(irq);
return qemu_allocate_irqs(qemu_notirq, irq, 1)[0];
}
static void qemu_splitirq(void *opaque, int line, int level)
{
struct IRQState **irq = opaque;
irq[0]->handler(irq[0]->opaque, irq[0]->n, level);
irq[1]->handler(irq[1]->opaque, irq[1]->n, level);
}
qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2)
{
qemu_irq *s = g_malloc0(2 * sizeof(qemu_irq));
s[0] = irq1;
s[1] = irq2;
return qemu_allocate_irqs(qemu_splitirq, s, 1)[0];
}
static void proxy_irq_handler(void *opaque, int n, int level)
{
qemu_irq **target = opaque;
if (*target) {
qemu_set_irq((*target)[n], level);
}
}
qemu_irq *qemu_irq_proxy(qemu_irq **target, int n)
{
return qemu_allocate_irqs(proxy_irq_handler, target, n);
}
void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n)
{
int i;
qemu_irq *old_irqs = qemu_allocate_irqs(NULL, NULL, n);
for (i = 0; i < n; i++) {
*old_irqs[i] = *gpio_in[i];
gpio_in[i]->handler = handler;
gpio_in[i]->opaque = old_irqs;
}
}
void qemu_irq_intercept_out(qemu_irq **gpio_out, qemu_irq_handler handler, int n)
{
qemu_irq *old_irqs = *gpio_out;
*gpio_out = qemu_allocate_irqs(handler, old_irqs, n);
}
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