+ /*
+ * I2C MOT transactions.
+ *
+ * Here we send a start when:
+ * - We didn't start transaction yet.
+ * - We had a READ and we do a WRITE.
+ * - We changed the address.
+ */
+ case WRITE_I2C_MOT:
+ if (!i2c_bus_busy(i2c_bus)) {
+ /*
+ * No transactions started..
+ */
+ if (i2c_start_transfer(i2c_bus, address, 0)) {
+ ret = AUX_I2C_NACK;
+ break;
+ }
+ } else if ((address != bus->last_i2c_address) ||
+ (bus->last_transaction == READ_I2C_MOT)) {
+ /*
+ * Transaction started but we need to restart..
+ */
+ i2c_end_transfer(i2c_bus);
+ if (i2c_start_transfer(i2c_bus, address, 0)) {
+ ret = AUX_I2C_NACK;
+ break;
+ }
+ }
+
+ while (len > 0) {
+ if (!i2c_send(i2c_bus, *data++)) {
+ ret = AUX_I2C_NACK;
+ i2c_end_transfer(i2c_bus);
+ break;
+ }
+ len--;
+ }
+ bus->last_transaction = WRITE_I2C_MOT;
+ bus->last_i2c_address = address;
+ ret = AUX_I2C_ACK;
+ break;
+ case READ_I2C_MOT:
+ if (!i2c_bus_busy(i2c_bus)) {
+ /*
+ * No transactions started..
+ */
+ if (i2c_start_transfer(i2c_bus, address, 1)) {
+ ret = AUX_I2C_NACK;
+ break;
+ }
+ } else if (address != bus->last_i2c_address) {
+ /*
+ * Transaction started but we need to restart..
+ */
+ i2c_end_transfer(i2c_bus);
+ if (i2c_start_transfer(i2c_bus, address, 1)) {
+ ret = AUX_I2C_NACK;
+ break;
+ }
+ }
+
+ while (len > 0) {
+ temp = i2c_recv(i2c_bus);
+
+ if (temp < 0) {
+ ret = AUX_I2C_NACK;
+ i2c_end_transfer(i2c_bus);
+ break;
+ }
+
+ *data++ = temp;
+ len--;
+ }
+ bus->last_transaction = READ_I2C_MOT;
+ bus->last_i2c_address = address;
+ ret = AUX_I2C_ACK;
+ break;
+ default:
+ DPRINTF("Not implemented!\n");
+ ret = AUX_NACK;
+ break;
+ }
+
+ DPRINTF("reply: %u\n", ret);
+ return ret;
+}
+
+/*
+ * AUX to I2C bridge.
+ */
+struct AUXTOI2CState {
+ /*< private >*/
+ DeviceState parent_obj;
+ /*< public >*/
+ I2CBus *i2c_bus;
+};
+
+I2CBus *aux_get_i2c_bus(AUXBus *bus)
+{
+ return bus->bridge->i2c_bus;
+}
+
+static void aux_bridge_init(Object *obj)
+{
+ AUXTOI2CState *s = AUXTOI2C(obj);
+
+ s->i2c_bus = i2c_init_bus(DEVICE(obj), "aux-i2c");
+}
+
+static const TypeInfo aux_to_i2c_type_info = {
+ .name = TYPE_AUXTOI2C,
+ .parent = TYPE_DEVICE,
+ .instance_size = sizeof(AUXTOI2CState),
+ .instance_init = aux_bridge_init
+};
+
+/*
+ * AUX Slave.
+ */
+static void aux_slave_dev_print(Monitor *mon, DeviceState *dev, int indent)
+{
+ AUXBus *bus = AUX_BUS(qdev_get_parent_bus(dev));
+ AUXSlave *s;
+
+ /* Don't print anything if the device is I2C "bridge". */
+ if (aux_bus_is_bridge(bus, dev)) {
+ return;
+ }
+
+ s = AUX_SLAVE(dev);
+
+ monitor_printf(mon, "%*smemory " TARGET_FMT_plx "/" TARGET_FMT_plx "\n",
+ indent, "",
+ object_property_get_int(OBJECT(s->mmio), "addr", NULL),
+ memory_region_size(s->mmio));
+}
+
+DeviceState *aux_create_slave(AUXBus *bus, const char *type, uint32_t addr)
+{
+ DeviceState *dev;
+
+ dev = DEVICE(object_new(type));
+ assert(dev);
+ qdev_set_parent_bus(dev, &bus->qbus);
+ qdev_init_nofail(dev);
+ aux_bus_map_device(AUX_BUS(qdev_get_parent_bus(dev)), AUX_SLAVE(dev),
addr);
+ return dev;
+}
+
+void aux_init_mmio(AUXSlave *aux_slave, MemoryRegion *mmio)
+{
+ assert(!aux_slave->mmio);
+ aux_slave->mmio = mmio;
+}
+
+static void aux_slave_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *k = DEVICE_CLASS(klass);
+
+ set_bit(DEVICE_CATEGORY_MISC, k->categories);
+ k->bus_type = TYPE_AUX_BUS;
+}
+
+static const TypeInfo aux_slave_type_info = {
+ .name = TYPE_AUX_SLAVE,
+ .parent = TYPE_DEVICE,
+ .instance_size = sizeof(AUXSlave),
+ .abstract = true,
+ .class_init = aux_slave_class_init,
+};
+
+static void aux_slave_register_types(void)
+{
+ type_register_static(&aux_bus_info);
+ type_register_static(&aux_slave_type_info);
+ type_register_static(&aux_to_i2c_type_info);
+}
+
+type_init(aux_slave_register_types)
diff --git a/include/hw/misc/aux.h b/include/hw/misc/aux.h
new file mode 100644
index 0000000..5d3e7a5
--- /dev/null
+++ b/include/hw/misc/aux.h
@@ -0,0 +1,124 @@
+/*
+ * aux.h
+ *
+ * Copyright (C)2014 : GreenSocs Ltd
+ * http://www.greensocs.com/ , email: i...@greensocs.com
+ *
+ * Developed by :
+ * Frederic Konrad <fred.kon...@greensocs.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option)any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef QEMU_AUX_H
+#define QEMU_AUX_H
+
+#include "hw/qdev.h"
+
+typedef struct AUXBus AUXBus;
+typedef struct AUXSlave AUXSlave;
+typedef enum AUXCommand AUXCommand;
+typedef enum AUXReply AUXReply;
+typedef struct AUXTOI2CState AUXTOI2CState;
+
+enum AUXCommand {
+ WRITE_I2C = 0,
+ READ_I2C = 1,
+ WRITE_I2C_STATUS = 2,
+ WRITE_I2C_MOT = 4,
+ READ_I2C_MOT = 5,
+ WRITE_AUX = 8,
+ READ_AUX = 9
+};
+
+enum AUXReply {
+ AUX_I2C_ACK = 0,
+ AUX_NACK = 1,
+ AUX_DEFER = 2,
+ AUX_I2C_NACK = 4,
+ AUX_I2C_DEFER = 8
+};
+
+struct AUXBus {
+ /* < private > */
+ BusState qbus;
+ /* < public > */
+ AUXSlave *current_dev;
+ AUXSlave *dev;
+ uint32_t last_i2c_address;
+ AUXCommand last_transaction;
+
+ AUXTOI2CState *bridge;
+
+ MemoryRegion *aux_io;
+ AddressSpace aux_addr_space;
+};
+
+#define TYPE_AUX_SLAVE "aux-slave"
+#define AUX_SLAVE(obj) \
+ OBJECT_CHECK(AUXSlave, (obj), TYPE_AUX_SLAVE)
+
+struct AUXSlave {
+ /* < private > */
+ DeviceState parent_obj;
+
+ /* < public > */
+ MemoryRegion *mmio;
+};
+
+/**
+ * aux_init_bus: Initialize an AUX bus.
+ *
+ * Returns the new AUX bus created.
+ *
+ * @parent The device where this bus is located.
+ * @name The name of the bus.
+ */
+AUXBus *aux_init_bus(DeviceState *parent, const char *name);
+
+/*
+ * aux_request: Make a request on the bus.
+ *
+ * Returns the reply of the request.
+ *
+ * @bus Ths bus where the request happen.
+ * @cmd The command requested.
+ * @address The 20bits address of the slave.
+ * @len The length of the read or write.
+ * @data The data array which will be filled or read during transfer.
+ */
+AUXReply aux_request(AUXBus *bus, AUXCommand cmd, uint32_t address,
+ uint8_t len, uint8_t *data);
+
+/*
+ * aux_get_i2c_bus: Get the i2c bus for I2C over AUX command.
+ *
+ * Returns the i2c bus associated to this AUX bus.
+ *
+ * @bus The AUX bus.
+ */
+I2CBus *aux_get_i2c_bus(AUXBus *bus);
+
+/*
+ * aux_init_mmio: Init an mmio for an AUX slave.
+ *
+ * @aux_slave The AUX slave.
+ * @mmio The mmio to be registered.
+ */
+void aux_init_mmio(AUXSlave *aux_slave, MemoryRegion *mmio);
+
+DeviceState *aux_create_slave(AUXBus *bus, const char *name, uint32_t addr);
+
+#endif /* !QEMU_AUX_H */
--
1.9.0
