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xemu/hw/misc/auxbus.c
Philippe Mathieu-Daudé 90603c5b89 hw/i2c: Introduce i2c_start_recv() and i2c_start_send() 
To ease reviewing code using the I2C bus API, introduce the
i2c_start_recv() and i2c_start_send() helpers which don't
take the confusing 'is_recv' boolean argument.

Use these new helpers in the SMBus / AUX bus models.

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
2021-07-08 14:15:01 -05:00

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/*
* 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)
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_bus_init(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);
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_bus_realize(AUXBus *bus)
{
qdev_realize(DEVICE(bus->bridge), BUS(bus), &error_fatal);
}
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;
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:
for (i = 0; i < len; i++) {
if (!address_space_rw(&bus->aux_addr_space, address++,
MEMTXATTRS_UNSPECIFIED, data++, 1,
cmd == WRITE_AUX)) {
ret = AUX_I2C_ACK;
} else {
ret = AUX_NACK;
break;
}
}
break;
/*
* Classic I2C transactions..
*/
case READ_I2C:
if (i2c_bus_busy(i2c_bus)) {
i2c_end_transfer(i2c_bus);
}
if (i2c_start_recv(i2c_bus, address)) {
ret = AUX_I2C_NACK;
break;
}
ret = AUX_I2C_ACK;
for (i = 0; i < len; i++) {
data[i] = i2c_recv(i2c_bus);
}
i2c_end_transfer(i2c_bus);
break;
case WRITE_I2C:
if (i2c_bus_busy(i2c_bus)) {
i2c_end_transfer(i2c_bus);
}
if (i2c_start_send(i2c_bus, address)) {
ret = AUX_I2C_NACK;
break;
}
ret = AUX_I2C_ACK;
for (i = 0; i < len; i++) {
if (i2c_send(i2c_bus, data[i]) < 0) {
ret = AUX_I2C_NACK;
break;
}
}
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:
ret = AUX_I2C_NACK;
if (!i2c_bus_busy(i2c_bus)) {
/*
* No transactions started..
*/
if (i2c_start_send(i2c_bus, address)) {
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_send(i2c_bus, address)) {
break;
}
}
bus->last_transaction = cmd;
bus->last_i2c_address = address;
ret = AUX_I2C_ACK;
for (i = 0; i < len; i++) {
if (i2c_send(i2c_bus, data[i]) < 0) {
i2c_end_transfer(i2c_bus);
ret = AUX_I2C_NACK;
break;
}
}
break;
case READ_I2C_MOT:
ret = AUX_I2C_NACK;
if (!i2c_bus_busy(i2c_bus)) {
/*
* No transactions started..
*/
if (i2c_start_recv(i2c_bus, address)) {
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_recv(i2c_bus, address)) {
break;
}
}
bus->last_transaction = cmd;
bus->last_i2c_address = address;
for (i = 0; i < len; i++) {
data[i] = i2c_recv(i2c_bus);
}
ret = AUX_I2C_ACK;
break;
default:
qemu_log_mask(LOG_UNIMP, "AUX cmd=%u not implemented\n", cmd);
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_bus_init(..). 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_AUX_SLAVE,
.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));
}
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)
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