0b8fa32f55
Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20190523143508.25387-4-armbru@redhat.com> [Rebased with conflicts resolved automatically, except for hw/usb/dev-hub.c hw/misc/exynos4210_rng.c hw/misc/bcm2835_rng.c hw/misc/aspeed_scu.c hw/display/virtio-vga.c hw/arm/stm32f205_soc.c; ui/cocoa.m fixed up]
312 lines
8.4 KiB
C
312 lines
8.4 KiB
C
/*
|
|
* auxbus.c
|
|
*
|
|
* Copyright 2015 : GreenSocs Ltd
|
|
* http://www.greensocs.com/ , email: info@greensocs.com
|
|
*
|
|
* Developed by :
|
|
* Frederic Konrad <fred.konrad@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/>.
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* This is an implementation of the AUX bus for VESA Display Port v1.1a.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "qemu/units.h"
|
|
#include "qemu/log.h"
|
|
#include "qemu/module.h"
|
|
#include "hw/misc/auxbus.h"
|
|
#include "hw/i2c/i2c.h"
|
|
#include "monitor/monitor.h"
|
|
#include "qapi/error.h"
|
|
|
|
#ifndef DEBUG_AUX
|
|
#define DEBUG_AUX 0
|
|
#endif
|
|
|
|
#define DPRINTF(fmt, ...) do { \
|
|
if (DEBUG_AUX) { \
|
|
qemu_log("aux: " fmt , ## __VA_ARGS__); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define TYPE_AUXTOI2C "aux-to-i2c-bridge"
|
|
#define AUXTOI2C(obj) OBJECT_CHECK(AUXTOI2CState, (obj), TYPE_AUXTOI2C)
|
|
|
|
static void aux_slave_dev_print(Monitor *mon, DeviceState *dev, int indent);
|
|
static inline I2CBus *aux_bridge_get_i2c_bus(AUXTOI2CState *bridge);
|
|
|
|
/* aux-bus implementation (internal not public) */
|
|
static void aux_bus_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
BusClass *k = BUS_CLASS(klass);
|
|
|
|
/* AUXSlave has an MMIO so we need to change the way we print information
|
|
* in monitor.
|
|
*/
|
|
k->print_dev = aux_slave_dev_print;
|
|
}
|
|
|
|
AUXBus *aux_init_bus(DeviceState *parent, const char *name)
|
|
{
|
|
AUXBus *bus;
|
|
Object *auxtoi2c;
|
|
|
|
bus = AUX_BUS(qbus_create(TYPE_AUX_BUS, parent, name));
|
|
auxtoi2c = object_new_with_props(TYPE_AUXTOI2C, OBJECT(bus), "i2c",
|
|
&error_abort, NULL);
|
|
qdev_set_parent_bus(DEVICE(auxtoi2c), BUS(bus));
|
|
|
|
bus->bridge = AUXTOI2C(auxtoi2c);
|
|
|
|
/* Memory related. */
|
|
bus->aux_io = g_malloc(sizeof(*bus->aux_io));
|
|
memory_region_init(bus->aux_io, OBJECT(bus), "aux-io", 1 * MiB);
|
|
address_space_init(&bus->aux_addr_space, bus->aux_io, "aux-io");
|
|
return bus;
|
|
}
|
|
|
|
void aux_map_slave(AUXSlave *aux_dev, hwaddr addr)
|
|
{
|
|
DeviceState *dev = DEVICE(aux_dev);
|
|
AUXBus *bus = AUX_BUS(qdev_get_parent_bus(dev));
|
|
memory_region_add_subregion(bus->aux_io, addr, aux_dev->mmio);
|
|
}
|
|
|
|
static bool aux_bus_is_bridge(AUXBus *bus, DeviceState *dev)
|
|
{
|
|
return (dev == DEVICE(bus->bridge));
|
|
}
|
|
|
|
I2CBus *aux_get_i2c_bus(AUXBus *bus)
|
|
{
|
|
return aux_bridge_get_i2c_bus(bus->bridge);
|
|
}
|
|
|
|
AUXReply aux_request(AUXBus *bus, AUXCommand cmd, uint32_t address,
|
|
uint8_t len, uint8_t *data)
|
|
{
|
|
AUXReply ret = AUX_NACK;
|
|
I2CBus *i2c_bus = aux_get_i2c_bus(bus);
|
|
size_t i;
|
|
bool is_write = false;
|
|
|
|
DPRINTF("request at address 0x%" PRIX32 ", command %u, len %u\n", address,
|
|
cmd, len);
|
|
|
|
switch (cmd) {
|
|
/*
|
|
* Forward the request on the AUX bus..
|
|
*/
|
|
case WRITE_AUX:
|
|
case READ_AUX:
|
|
is_write = cmd == READ_AUX ? false : true;
|
|
for (i = 0; i < len; i++) {
|
|
if (!address_space_rw(&bus->aux_addr_space, address++,
|
|
MEMTXATTRS_UNSPECIFIED, data++, 1,
|
|
is_write)) {
|
|
ret = AUX_I2C_ACK;
|
|
} else {
|
|
ret = AUX_NACK;
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
/*
|
|
* Classic I2C transactions..
|
|
*/
|
|
case READ_I2C:
|
|
case WRITE_I2C:
|
|
is_write = cmd == READ_I2C ? false : true;
|
|
if (i2c_bus_busy(i2c_bus)) {
|
|
i2c_end_transfer(i2c_bus);
|
|
}
|
|
|
|
if (i2c_start_transfer(i2c_bus, address, is_write)) {
|
|
ret = AUX_I2C_NACK;
|
|
break;
|
|
}
|
|
|
|
ret = AUX_I2C_ACK;
|
|
while (len > 0) {
|
|
if (i2c_send_recv(i2c_bus, data++, is_write) < 0) {
|
|
ret = AUX_I2C_NACK;
|
|
break;
|
|
}
|
|
len--;
|
|
}
|
|
i2c_end_transfer(i2c_bus);
|
|
break;
|
|
/*
|
|
* 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:
|
|
case READ_I2C_MOT:
|
|
is_write = cmd == READ_I2C_MOT ? false : true;
|
|
ret = AUX_I2C_NACK;
|
|
if (!i2c_bus_busy(i2c_bus)) {
|
|
/*
|
|
* No transactions started..
|
|
*/
|
|
if (i2c_start_transfer(i2c_bus, address, is_write)) {
|
|
break;
|
|
}
|
|
} else if ((address != bus->last_i2c_address) ||
|
|
(bus->last_transaction != cmd)) {
|
|
/*
|
|
* Transaction started but we need to restart..
|
|
*/
|
|
i2c_end_transfer(i2c_bus);
|
|
if (i2c_start_transfer(i2c_bus, address, is_write)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
bus->last_transaction = cmd;
|
|
bus->last_i2c_address = address;
|
|
while (len > 0) {
|
|
if (i2c_send_recv(i2c_bus, data++, is_write) < 0) {
|
|
i2c_end_transfer(i2c_bus);
|
|
break;
|
|
}
|
|
len--;
|
|
}
|
|
if (len == 0) {
|
|
ret = AUX_I2C_ACK;
|
|
}
|
|
break;
|
|
default:
|
|
DPRINTF("Not implemented!\n");
|
|
return AUX_NACK;
|
|
}
|
|
|
|
DPRINTF("reply: %u\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
static const TypeInfo aux_bus_info = {
|
|
.name = TYPE_AUX_BUS,
|
|
.parent = TYPE_BUS,
|
|
.instance_size = sizeof(AUXBus),
|
|
.class_init = aux_bus_class_init
|
|
};
|
|
|
|
/* aux-i2c implementation (internal not public) */
|
|
struct AUXTOI2CState {
|
|
/*< private >*/
|
|
DeviceState parent_obj;
|
|
|
|
/*< public >*/
|
|
I2CBus *i2c_bus;
|
|
};
|
|
|
|
static void aux_bridge_class_init(ObjectClass *oc, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(oc);
|
|
|
|
/* This device is private and is created only once for each
|
|
* aux-bus in aux_init_bus(..). So don't allow the user to add one.
|
|
*/
|
|
dc->user_creatable = false;
|
|
}
|
|
|
|
static void aux_bridge_init(Object *obj)
|
|
{
|
|
AUXTOI2CState *s = AUXTOI2C(obj);
|
|
|
|
s->i2c_bus = i2c_init_bus(DEVICE(obj), "aux-i2c");
|
|
}
|
|
|
|
static inline I2CBus *aux_bridge_get_i2c_bus(AUXTOI2CState *bridge)
|
|
{
|
|
return bridge->i2c_bus;
|
|
}
|
|
|
|
static const TypeInfo aux_to_i2c_type_info = {
|
|
.name = TYPE_AUXTOI2C,
|
|
.parent = TYPE_DEVICE,
|
|
.class_init = aux_bridge_class_init,
|
|
.instance_size = sizeof(AUXTOI2CState),
|
|
.instance_init = aux_bridge_init
|
|
};
|
|
|
|
/* aux-slave implementation */
|
|
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_uint(OBJECT(s->mmio), "addr", NULL),
|
|
memory_region_size(s->mmio));
|
|
}
|
|
|
|
DeviceState *aux_create_slave(AUXBus *bus, const char *type)
|
|
{
|
|
DeviceState *dev;
|
|
|
|
dev = DEVICE(object_new(type));
|
|
assert(dev);
|
|
qdev_set_parent_bus(dev, &bus->qbus);
|
|
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_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_register_types)
|