X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=qemu%2Fhw%2Fi2c%2Fcore.c;fp=qemu%2Fhw%2Fi2c%2Fcore.c;h=5a64026347ab73e60628001a0cf0dfa54db13112;hb=e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb;hp=0000000000000000000000000000000000000000;hpb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;p=kvmfornfv.git

diff --git a/qemu/hw/i2c/core.c b/qemu/hw/i2c/core.c
new file mode 100644
index 000000000..5a6402634
--- /dev/null
+++ b/qemu/hw/i2c/core.c
@@ -0,0 +1,245 @@
+/*
+ * QEMU I2C bus interface.
+ *
+ * Copyright (c) 2007 CodeSourcery.
+ * Written by Paul Brook
+ *
+ * This code is licensed under the LGPL.
+ */
+
+#include "hw/i2c/i2c.h"
+
+struct I2CBus
+{
+    BusState qbus;
+    I2CSlave *current_dev;
+    I2CSlave *dev;
+    uint8_t saved_address;
+};
+
+static Property i2c_props[] = {
+    DEFINE_PROP_UINT8("address", struct I2CSlave, address, 0),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+#define TYPE_I2C_BUS "i2c-bus"
+#define I2C_BUS(obj) OBJECT_CHECK(I2CBus, (obj), TYPE_I2C_BUS)
+
+static const TypeInfo i2c_bus_info = {
+    .name = TYPE_I2C_BUS,
+    .parent = TYPE_BUS,
+    .instance_size = sizeof(I2CBus),
+};
+
+static void i2c_bus_pre_save(void *opaque)
+{
+    I2CBus *bus = opaque;
+
+    bus->saved_address = bus->current_dev ? bus->current_dev->address : -1;
+}
+
+static int i2c_bus_post_load(void *opaque, int version_id)
+{
+    I2CBus *bus = opaque;
+
+    /* The bus is loaded before attached devices, so load and save the
+       current device id.  Devices will check themselves as loaded.  */
+    bus->current_dev = NULL;
+    return 0;
+}
+
+static const VMStateDescription vmstate_i2c_bus = {
+    .name = "i2c_bus",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .pre_save = i2c_bus_pre_save,
+    .post_load = i2c_bus_post_load,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT8(saved_address, I2CBus),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+/* Create a new I2C bus.  */
+I2CBus *i2c_init_bus(DeviceState *parent, const char *name)
+{
+    I2CBus *bus;
+
+    bus = I2C_BUS(qbus_create(TYPE_I2C_BUS, parent, name));
+    vmstate_register(NULL, -1, &vmstate_i2c_bus, bus);
+    return bus;
+}
+
+void i2c_set_slave_address(I2CSlave *dev, uint8_t address)
+{
+    dev->address = address;
+}
+
+/* Return nonzero if bus is busy.  */
+int i2c_bus_busy(I2CBus *bus)
+{
+    return bus->current_dev != NULL;
+}
+
+/* Returns non-zero if the address is not valid.  */
+/* TODO: Make this handle multiple masters.  */
+int i2c_start_transfer(I2CBus *bus, uint8_t address, int recv)
+{
+    BusChild *kid;
+    I2CSlave *slave = NULL;
+    I2CSlaveClass *sc;
+
+    QTAILQ_FOREACH(kid, &bus->qbus.children, sibling) {
+        DeviceState *qdev = kid->child;
+        I2CSlave *candidate = I2C_SLAVE(qdev);
+        if (candidate->address == address) {
+            slave = candidate;
+            break;
+        }
+    }
+
+    if (!slave) {
+        return 1;
+    }
+
+    sc = I2C_SLAVE_GET_CLASS(slave);
+    /* If the bus is already busy, assume this is a repeated
+       start condition.  */
+    bus->current_dev = slave;
+    if (sc->event) {
+        sc->event(slave, recv ? I2C_START_RECV : I2C_START_SEND);
+    }
+    return 0;
+}
+
+void i2c_end_transfer(I2CBus *bus)
+{
+    I2CSlave *dev = bus->current_dev;
+    I2CSlaveClass *sc;
+
+    if (!dev) {
+        return;
+    }
+
+    sc = I2C_SLAVE_GET_CLASS(dev);
+    if (sc->event) {
+        sc->event(dev, I2C_FINISH);
+    }
+
+    bus->current_dev = NULL;
+}
+
+int i2c_send(I2CBus *bus, uint8_t data)
+{
+    I2CSlave *dev = bus->current_dev;
+    I2CSlaveClass *sc;
+
+    if (!dev) {
+        return -1;
+    }
+
+    sc = I2C_SLAVE_GET_CLASS(dev);
+    if (sc->send) {
+        return sc->send(dev, data);
+    }
+
+    return -1;
+}
+
+int i2c_recv(I2CBus *bus)
+{
+    I2CSlave *dev = bus->current_dev;
+    I2CSlaveClass *sc;
+
+    if (!dev) {
+        return -1;
+    }
+
+    sc = I2C_SLAVE_GET_CLASS(dev);
+    if (sc->recv) {
+        return sc->recv(dev);
+    }
+
+    return -1;
+}
+
+void i2c_nack(I2CBus *bus)
+{
+    I2CSlave *dev = bus->current_dev;
+    I2CSlaveClass *sc;
+
+    if (!dev) {
+        return;
+    }
+
+    sc = I2C_SLAVE_GET_CLASS(dev);
+    if (sc->event) {
+        sc->event(dev, I2C_NACK);
+    }
+}
+
+static int i2c_slave_post_load(void *opaque, int version_id)
+{
+    I2CSlave *dev = opaque;
+    I2CBus *bus;
+    bus = I2C_BUS(qdev_get_parent_bus(DEVICE(dev)));
+    if (bus->saved_address == dev->address) {
+        bus->current_dev = dev;
+    }
+    return 0;
+}
+
+const VMStateDescription vmstate_i2c_slave = {
+    .name = "I2CSlave",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .post_load = i2c_slave_post_load,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT8(address, I2CSlave),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static int i2c_slave_qdev_init(DeviceState *dev)
+{
+    I2CSlave *s = I2C_SLAVE(dev);
+    I2CSlaveClass *sc = I2C_SLAVE_GET_CLASS(s);
+
+    return sc->init(s);
+}
+
+DeviceState *i2c_create_slave(I2CBus *bus, const char *name, uint8_t addr)
+{
+    DeviceState *dev;
+
+    dev = qdev_create(&bus->qbus, name);
+    qdev_prop_set_uint8(dev, "address", addr);
+    qdev_init_nofail(dev);
+    return dev;
+}
+
+static void i2c_slave_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *k = DEVICE_CLASS(klass);
+    k->init = i2c_slave_qdev_init;
+    set_bit(DEVICE_CATEGORY_MISC, k->categories);
+    k->bus_type = TYPE_I2C_BUS;
+    k->props = i2c_props;
+}
+
+static const TypeInfo i2c_slave_type_info = {
+    .name = TYPE_I2C_SLAVE,
+    .parent = TYPE_DEVICE,
+    .instance_size = sizeof(I2CSlave),
+    .abstract = true,
+    .class_size = sizeof(I2CSlaveClass),
+    .class_init = i2c_slave_class_init,
+};
+
+static void i2c_slave_register_types(void)
+{
+    type_register_static(&i2c_bus_info);
+    type_register_static(&i2c_slave_type_info);
+}
+
+type_init(i2c_slave_register_types)