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hw/i2c: flatten pca954x mux device 

Previously this device created N subdevices which each owned an i2c bus.
Now this device simply owns the N i2c busses directly.

Tested: Verified devices behind mux are still accessible via qmp and i2c
from within an arm32 SoC.

Reviewed-by: Hao Wu <wuhaotsh@google.com>
Signed-off-by: Patrick Venture <venture@google.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20220202164533.1283668-1-venture@google.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Patrick Venture 2022-02-02 08:45:33 -08:00 committed by Peter Maydell
parent bad187dfcb
commit d8bdf97972
1 changed files with 13 additions and 64 deletions
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77
hw/i2c/i2c_mux_pca954x.c
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@ -30,24 +30,6 @@
#define PCA9548_CHANNEL_COUNT 8
#define PCA9546_CHANNEL_COUNT 4
/*
* struct Pca954xChannel - The i2c mux device will have N of these states
* that own the i2c channel bus.
* @bus: The owned channel bus.
* @enabled: Is this channel active?
*/
typedef struct Pca954xChannel {
SysBusDevice parent;
I2CBus *bus;
bool enabled;
} Pca954xChannel;
#define TYPE_PCA954X_CHANNEL "pca954x-channel"
#define PCA954X_CHANNEL(obj) \
OBJECT_CHECK(Pca954xChannel, (obj), TYPE_PCA954X_CHANNEL)
/*
* struct Pca954xState - The pca954x state object.
* @control: The value written to the mux control.
@ -59,8 +41,8 @@ typedef struct Pca954xState {
uint8_t control;
/* The channel i2c buses. */
Pca954xChannel channel[PCA9548_CHANNEL_COUNT];
bool enabled[PCA9548_CHANNEL_COUNT];
I2CBus *bus[PCA9548_CHANNEL_COUNT];
} Pca954xState;
/*
@ -98,11 +80,11 @@ static bool pca954x_match(I2CSlave *candidate, uint8_t address,
}
for (i = 0; i < mc->nchans; i++) {
if (!mux->channel[i].enabled) {
if (!mux->enabled[i]) {
continue;
}
if (i2c_scan_bus(mux->channel[i].bus, address, broadcast,
if (i2c_scan_bus(mux->bus[i], address, broadcast,
current_devs)) {
if (!broadcast) {
return true;
@ -125,9 +107,9 @@ static void pca954x_enable_channel(Pca954xState *s, uint8_t enable_mask)
*/
for (i = 0; i < mc->nchans; i++) {
if (enable_mask & (1 << i)) {
s->channel[i].enabled = true;
s->enabled[i] = true;
} else {
s->channel[i].enabled = false;
s->enabled[i] = false;
}
}
}
@ -184,23 +166,7 @@ I2CBus *pca954x_i2c_get_bus(I2CSlave *mux, uint8_t channel)
Pca954xState *pca954x = PCA954X(mux);
g_assert(channel < pc->nchans);
return I2C_BUS(qdev_get_child_bus(DEVICE(&pca954x->channel[channel]),
"i2c-bus"));
}
static void pca954x_channel_init(Object *obj)
{
Pca954xChannel *s = PCA954X_CHANNEL(obj);
s->bus = i2c_init_bus(DEVICE(s), "i2c-bus");
/* Start all channels as disabled. */
s->enabled = false;
}
static void pca954x_channel_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->desc = "Pca954x Channel";
return pca954x->bus[channel];
}
static void pca9546_class_init(ObjectClass *klass, void *data)
@ -215,28 +181,19 @@ static void pca9548_class_init(ObjectClass *klass, void *data)
s->nchans = PCA9548_CHANNEL_COUNT;
}
static void pca954x_realize(DeviceState *dev, Error **errp)
{
Pca954xState *s = PCA954X(dev);
Pca954xClass *c = PCA954X_GET_CLASS(s);
int i;
/* SMBus modules. Cannot fail. */
for (i = 0; i < c->nchans; i++) {
sysbus_realize(SYS_BUS_DEVICE(&s->channel[i]), &error_abort);
}
}
static void pca954x_init(Object *obj)
{
Pca954xState *s = PCA954X(obj);
Pca954xClass *c = PCA954X_GET_CLASS(obj);
int i;
/* Only initialize the children we expect. */
/* SMBus modules. Cannot fail. */
for (i = 0; i < c->nchans; i++) {
object_initialize_child(obj, "channel[*]", &s->channel[i],
TYPE_PCA954X_CHANNEL);
g_autofree gchar *bus_name = g_strdup_printf("i2c.%d", i);
/* start all channels as disabled. */
s->enabled[i] = false;
s->bus[i] = i2c_init_bus(DEVICE(s), bus_name);
}
}
@ -252,7 +209,6 @@ static void pca954x_class_init(ObjectClass *klass, void *data)
rc->phases.enter = pca954x_enter_reset;
dc->desc = "Pca954x i2c-mux";
dc->realize = pca954x_realize;
k->write_data = pca954x_write_data;
k->receive_byte = pca954x_read_byte;
@ -278,13 +234,6 @@ static const TypeInfo pca954x_info[] = {
.parent = TYPE_PCA954X,
.class_init = pca9548_class_init,
},
{
.name = TYPE_PCA954X_CHANNEL,
.parent = TYPE_SYS_BUS_DEVICE,
.class_init = pca954x_channel_class_init,
.instance_size = sizeof(Pca954xChannel),
.instance_init = pca954x_channel_init,
}
};
DEFINE_TYPES(pca954x_info)