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/*
* SD card bus interface code.
*
* Copyright (c) 2015 Linaro Limited
*
* Author:
* Peter Maydell <peter.maydell@linaro.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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/>.
*/
#include "qemu/osdep.h"
#include "hw/qdev-core.h"
#include "hw/sd/sd.h"
#include "trace.h"
static inline const char *sdbus_name(SDBus *sdbus)
{
return sdbus->qbus.name;
}
static SDState *get_card(SDBus *sdbus)
{
/* We only ever have one child on the bus so just return it */
BusChild *kid = QTAILQ_FIRST(&sdbus->qbus.children);
if (!kid) {
return NULL;
}
return SD_CARD(kid->child);
}
uint8_t sdbus_get_dat_lines(SDBus *sdbus)
{
SDState *slave = get_card(sdbus);
uint8_t dat_lines = 0b1111; /* 4 bit bus width */
if (slave) {
SDCardClass *sc = SD_CARD_GET_CLASS(slave);
if (sc->get_dat_lines) {
dat_lines = sc->get_dat_lines(slave);
}
}
trace_sdbus_get_dat_lines(sdbus_name(sdbus), dat_lines);
return dat_lines;
}
bool sdbus_get_cmd_line(SDBus *sdbus)
{
SDState *slave = get_card(sdbus);
bool cmd_line = true;
if (slave) {
SDCardClass *sc = SD_CARD_GET_CLASS(slave);
if (sc->get_cmd_line) {
cmd_line = sc->get_cmd_line(slave);
}
}
trace_sdbus_get_cmd_line(sdbus_name(sdbus), cmd_line);
return cmd_line;
}
void sdbus_set_voltage(SDBus *sdbus, uint16_t millivolts)
{
SDState *card = get_card(sdbus);
trace_sdbus_set_voltage(sdbus_name(sdbus), millivolts);
if (card) {
SDCardClass *sc = SD_CARD_GET_CLASS(card);
assert(sc->set_voltage);
sc->set_voltage(card, millivolts);
}
}
int sdbus_do_command(SDBus *sdbus, SDRequest *req, uint8_t *response)
{
SDState *card = get_card(sdbus);
trace_sdbus_command(sdbus_name(sdbus), req->cmd, req->arg);
if (card) {
SDCardClass *sc = SD_CARD_GET_CLASS(card);
return sc->do_command(card, req, response);
}
return 0;
}
void sdbus_write_data(SDBus *sdbus, uint8_t value)
{
SDState *card = get_card(sdbus);
trace_sdbus_write(sdbus_name(sdbus), value);
if (card) {
SDCardClass *sc = SD_CARD_GET_CLASS(card);
sc->write_data(card, value);
}
}
uint8_t sdbus_read_data(SDBus *sdbus)
{
SDState *card = get_card(sdbus);
uint8_t value = 0;
if (card) {
SDCardClass *sc = SD_CARD_GET_CLASS(card);
value = sc->read_data(card);
}
trace_sdbus_read(sdbus_name(sdbus), value);
return value;
}
bool sdbus_data_ready(SDBus *sdbus)
{
SDState *card = get_card(sdbus);
if (card) {
SDCardClass *sc = SD_CARD_GET_CLASS(card);
return sc->data_ready(card);
}
return false;
}
bool sdbus_get_inserted(SDBus *sdbus)
{
SDState *card = get_card(sdbus);
if (card) {
SDCardClass *sc = SD_CARD_GET_CLASS(card);
return sc->get_inserted(card);
}
return false;
}
bool sdbus_get_readonly(SDBus *sdbus)
{
SDState *card = get_card(sdbus);
if (card) {
SDCardClass *sc = SD_CARD_GET_CLASS(card);
return sc->get_readonly(card);
}
return false;
}
void sdbus_set_inserted(SDBus *sdbus, bool inserted)
{
SDBusClass *sbc = SD_BUS_GET_CLASS(sdbus);
BusState *qbus = BUS(sdbus);
if (sbc->set_inserted) {
sbc->set_inserted(qbus->parent, inserted);
}
}
void sdbus_set_readonly(SDBus *sdbus, bool readonly)
{
SDBusClass *sbc = SD_BUS_GET_CLASS(sdbus);
BusState *qbus = BUS(sdbus);
if (sbc->set_readonly) {
sbc->set_readonly(qbus->parent, readonly);
}
}
void sdbus_reparent_card(SDBus *from, SDBus *to)
{
SDState *card = get_card(from);
SDCardClass *sc;
bool readonly;
/* We directly reparent the card object rather than implementing this
* as a hotpluggable connection because we don't want to expose SD cards
* to users as being hotpluggable, and we can get away with it in this
* limited use case. This could perhaps be implemented more cleanly in
* future by adding support to the hotplug infrastructure for "device
* can be hotplugged only via code, not by user".
*/
if (!card) {
return;
}
sc = SD_CARD_GET_CLASS(card);
readonly = sc->get_readonly(card);
sdbus_set_inserted(from, false);
qdev_set_parent_bus(DEVICE(card), &to->qbus);
sdbus_set_inserted(to, true);
sdbus_set_readonly(to, readonly);
}
static const TypeInfo sd_bus_info = {
.name = TYPE_SD_BUS,
.parent = TYPE_BUS,
.instance_size = sizeof(SDBus),
.class_size = sizeof(SDBusClass),
};
static void sd_bus_register_types(void)
{
type_register_static(&sd_bus_info);
}
type_init(sd_bus_register_types)
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