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/*
* GPIO Controller for a lot of Freescale SoCs
*
* Copyright (C) 2014 Freescale Semiconductor, Inc. All rights reserved.
*
* Author: Alexander Graf, <agraf@suse.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "hw/sysbus.h"
#define TYPE_MPC8XXX_GPIO "mpc8xxx_gpio"
#define MPC8XXX_GPIO(obj) OBJECT_CHECK(MPC8XXXGPIOState, (obj), TYPE_MPC8XXX_GPIO)
typedef struct MPC8XXXGPIOState {
SysBusDevice parent_obj;
MemoryRegion iomem;
qemu_irq irq;
qemu_irq out[32];
uint32_t dir;
uint32_t odr;
uint32_t dat;
uint32_t ier;
uint32_t imr;
uint32_t icr;
} MPC8XXXGPIOState;
static const VMStateDescription vmstate_mpc8xxx_gpio = {
.name = "mpc8xxx_gpio",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(dir, MPC8XXXGPIOState),
VMSTATE_UINT32(odr, MPC8XXXGPIOState),
VMSTATE_UINT32(dat, MPC8XXXGPIOState),
VMSTATE_UINT32(ier, MPC8XXXGPIOState),
VMSTATE_UINT32(imr, MPC8XXXGPIOState),
VMSTATE_UINT32(icr, MPC8XXXGPIOState),
VMSTATE_END_OF_LIST()
}
};
static void mpc8xxx_gpio_update(MPC8XXXGPIOState *s)
{
qemu_set_irq(s->irq, !!(s->ier & s->imr));
}
static uint64_t mpc8xxx_gpio_read(void *opaque, hwaddr offset,
unsigned size)
{
MPC8XXXGPIOState *s = (MPC8XXXGPIOState *)opaque;
if (size != 4) {
/* All registers are 32bit */
return 0;
}
switch (offset) {
case 0x0: /* Direction */
return s->dir;
case 0x4: /* Open Drain */
return s->odr;
case 0x8: /* Data */
return s->dat;
case 0xC: /* Interrupt Event */
return s->ier;
case 0x10: /* Interrupt Mask */
return s->imr;
case 0x14: /* Interrupt Control */
return s->icr;
default:
return 0;
}
}
static void mpc8xxx_write_data(MPC8XXXGPIOState *s, uint32_t new_data)
{
uint32_t old_data = s->dat;
uint32_t diff = old_data ^ new_data;
int i;
for (i = 0; i < 32; i++) {
uint32_t mask = 0x80000000 >> i;
if (!(diff & mask)) {
continue;
}
if (s->dir & mask) {
/* Output */
qemu_set_irq(s->out[i], (new_data & mask) != 0);
}
}
s->dat = new_data;
}
static void mpc8xxx_gpio_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
MPC8XXXGPIOState *s = (MPC8XXXGPIOState *)opaque;
if (size != 4) {
/* All registers are 32bit */
return;
}
switch (offset) {
case 0x0: /* Direction */
s->dir = value;
break;
case 0x4: /* Open Drain */
s->odr = value;
break;
case 0x8: /* Data */
mpc8xxx_write_data(s, value);
break;
case 0xC: /* Interrupt Event */
s->ier &= ~value;
break;
case 0x10: /* Interrupt Mask */
s->imr = value;
break;
case 0x14: /* Interrupt Control */
s->icr = value;
break;
}
mpc8xxx_gpio_update(s);
}
static void mpc8xxx_gpio_reset(MPC8XXXGPIOState *s)
{
s->dir = 0;
s->odr = 0;
s->dat = 0;
s->ier = 0;
s->imr = 0;
s->icr = 0;
}
static void mpc8xxx_gpio_set_irq(void * opaque, int irq, int level)
{
MPC8XXXGPIOState *s = (MPC8XXXGPIOState *)opaque;
uint32_t mask;
mask = 0x80000000 >> irq;
if ((s->dir & mask) == 0) {
uint32_t old_value = s->dat & mask;
s->dat &= ~mask;
if (level)
s->dat |= mask;
if (!(s->icr & irq) || (old_value && !level)) {
s->ier |= mask;
}
mpc8xxx_gpio_update(s);
}
}
static const MemoryRegionOps mpc8xxx_gpio_ops = {
.read = mpc8xxx_gpio_read,
.write = mpc8xxx_gpio_write,
.endianness = DEVICE_BIG_ENDIAN,
};
static int mpc8xxx_gpio_initfn(SysBusDevice *sbd)
{
DeviceState *dev = DEVICE(sbd);
MPC8XXXGPIOState *s = MPC8XXX_GPIO(dev);
memory_region_init_io(&s->iomem, OBJECT(s), &mpc8xxx_gpio_ops, s, "mpc8xxx_gpio", 0x1000);
sysbus_init_mmio(sbd, &s->iomem);
sysbus_init_irq(sbd, &s->irq);
qdev_init_gpio_in(dev, mpc8xxx_gpio_set_irq, 32);
qdev_init_gpio_out(dev, s->out, 32);
mpc8xxx_gpio_reset(s);
return 0;
}
static void mpc8xxx_gpio_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
k->init = mpc8xxx_gpio_initfn;
dc->vmsd = &vmstate_mpc8xxx_gpio;
}
static const TypeInfo mpc8xxx_gpio_info = {
.name = TYPE_MPC8XXX_GPIO,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(MPC8XXXGPIOState),
.class_init = mpc8xxx_gpio_class_init,
};
static void mpc8xxx_gpio_register_types(void)
{
type_register_static(&mpc8xxx_gpio_info);
}
type_init(mpc8xxx_gpio_register_types)
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