| /* |
| * 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 qbus; |
| }; |
| |
| #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(&s->qdev, ssi_cs_default, 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->qbus, 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 FROM_QBUS(SSIBus, bus); |
| } |
| |
| uint32_t ssi_transfer(SSIBus *bus, uint32_t val) |
| { |
| BusChild *kid; |
| SSISlaveClass *ssc; |
| uint32_t r = 0; |
| |
| QTAILQ_FOREACH(kid, &bus->qbus.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, |
| .minimum_version_id_old = 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(DEVICE(dev), 0); |
| qdev_set_parent_bus(DEVICE(dev), &arg->bus->qbus); |
| **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); |
| } |