qemu/hw/ssi/ssi.c
Cédric Le Goater 7673bb4cd3 ssi: change ssi_slave_init to be a realize ops
This enables qemu to handle late inits and report errors. All the SSI
slave routine names were changed accordingly. Code was modified to
handle errors when possible (m25p80 and ssi-sd)

Tested with the m25p80 slave object.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-id: 1467138270-32481-2-git-send-email-clg@kaod.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2016-07-04 13:15:22 +01:00

176 lines
4.2 KiB
C

/*
* QEMU Synchronous Serial Interface support
*
* Copyright (c) 2009 CodeSourcery.
* Copyright (c) 2012 Peter A.G. Crosthwaite (peter.crosthwaite@petalogix.com)
* Copyright (c) 2012 PetaLogix Pty Ltd.
* Written by Paul Brook
*
* This code is licensed under the GNU GPL v2.
*
* Contributions after 2012-01-13 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
#include "qemu/osdep.h"
#include "hw/ssi/ssi.h"
struct SSIBus {
BusState parent_obj;
};
#define TYPE_SSI_BUS "SSI"
#define SSI_BUS(obj) OBJECT_CHECK(SSIBus, (obj), TYPE_SSI_BUS)
static const TypeInfo ssi_bus_info = {
.name = TYPE_SSI_BUS,
.parent = TYPE_BUS,
.instance_size = sizeof(SSIBus),
};
static void ssi_cs_default(void *opaque, int n, int level)
{
SSISlave *s = SSI_SLAVE(opaque);
bool cs = !!level;
assert(n == 0);
if (s->cs != cs) {
SSISlaveClass *ssc = SSI_SLAVE_GET_CLASS(s);
if (ssc->set_cs) {
ssc->set_cs(s, cs);
}
}
s->cs = cs;
}
static uint32_t ssi_transfer_raw_default(SSISlave *dev, uint32_t val)
{
SSISlaveClass *ssc = SSI_SLAVE_GET_CLASS(dev);
if ((dev->cs && ssc->cs_polarity == SSI_CS_HIGH) ||
(!dev->cs && ssc->cs_polarity == SSI_CS_LOW) ||
ssc->cs_polarity == SSI_CS_NONE) {
return ssc->transfer(dev, val);
}
return 0;
}
static void ssi_slave_realize(DeviceState *dev, Error **errp)
{
SSISlave *s = SSI_SLAVE(dev);
SSISlaveClass *ssc = SSI_SLAVE_GET_CLASS(s);
if (ssc->transfer_raw == ssi_transfer_raw_default &&
ssc->cs_polarity != SSI_CS_NONE) {
qdev_init_gpio_in_named(dev, ssi_cs_default, SSI_GPIO_CS, 1);
}
ssc->realize(s, errp);
}
static void ssi_slave_class_init(ObjectClass *klass, void *data)
{
SSISlaveClass *ssc = SSI_SLAVE_CLASS(klass);
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = ssi_slave_realize;
dc->bus_type = TYPE_SSI_BUS;
if (!ssc->transfer_raw) {
ssc->transfer_raw = ssi_transfer_raw_default;
}
}
static const TypeInfo ssi_slave_info = {
.name = TYPE_SSI_SLAVE,
.parent = TYPE_DEVICE,
.class_init = ssi_slave_class_init,
.class_size = sizeof(SSISlaveClass),
.abstract = true,
};
DeviceState *ssi_create_slave_no_init(SSIBus *bus, const char *name)
{
return qdev_create(BUS(bus), name);
}
DeviceState *ssi_create_slave(SSIBus *bus, const char *name)
{
DeviceState *dev = ssi_create_slave_no_init(bus, name);
qdev_init_nofail(dev);
return dev;
}
SSIBus *ssi_create_bus(DeviceState *parent, const char *name)
{
BusState *bus;
bus = qbus_create(TYPE_SSI_BUS, parent, name);
return SSI_BUS(bus);
}
uint32_t ssi_transfer(SSIBus *bus, uint32_t val)
{
BusState *b = BUS(bus);
BusChild *kid;
SSISlaveClass *ssc;
uint32_t r = 0;
QTAILQ_FOREACH(kid, &b->children, sibling) {
SSISlave *slave = SSI_SLAVE(kid->child);
ssc = SSI_SLAVE_GET_CLASS(slave);
r |= ssc->transfer_raw(slave, val);
}
return r;
}
const VMStateDescription vmstate_ssi_slave = {
.name = "SSISlave",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_BOOL(cs, SSISlave),
VMSTATE_END_OF_LIST()
}
};
static void ssi_slave_register_types(void)
{
type_register_static(&ssi_bus_info);
type_register_static(&ssi_slave_info);
}
type_init(ssi_slave_register_types)
typedef struct SSIAutoConnectArg {
qemu_irq **cs_linep;
SSIBus *bus;
} SSIAutoConnectArg;
static int ssi_auto_connect_slave(Object *child, void *opaque)
{
SSIAutoConnectArg *arg = opaque;
SSISlave *dev = (SSISlave *)object_dynamic_cast(child, TYPE_SSI_SLAVE);
qemu_irq cs_line;
if (!dev) {
return 0;
}
cs_line = qdev_get_gpio_in_named(DEVICE(dev), SSI_GPIO_CS, 0);
qdev_set_parent_bus(DEVICE(dev), BUS(arg->bus));
**arg->cs_linep = cs_line;
(*arg->cs_linep)++;
return 0;
}
void ssi_auto_connect_slaves(DeviceState *parent, qemu_irq *cs_line,
SSIBus *bus)
{
SSIAutoConnectArg arg = {
.cs_linep = &cs_line,
.bus = bus
};
object_child_foreach(OBJECT(parent), ssi_auto_connect_slave, &arg);
}