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-rw-r--r--qemu/hw/ssi/ssi.c174
1 files changed, 174 insertions, 0 deletions
diff --git a/qemu/hw/ssi/ssi.c b/qemu/hw/ssi/ssi.c
new file mode 100644
index 000000000..2aab79ba7
--- /dev/null
+++ b/qemu/hw/ssi/ssi.c
@@ -0,0 +1,174 @@
+/*
+ * 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 "hw/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 int ssi_slave_init(DeviceState *dev)
+{
+ 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);
+ }
+
+ return ssc->init(s);
+}
+
+static void ssi_slave_class_init(ObjectClass *klass, void *data)
+{
+ SSISlaveClass *ssc = SSI_SLAVE_CLASS(klass);
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->init = ssi_slave_init;
+ 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);
+}