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firmware: scmi: smccc transport: implement multi-channel

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Updates SCMI SMCCC transport driver to get SCMI channel reference
at initialization and use when posting SCMI messages.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
This commit is contained in:
Etienne Carriere 2022-05-31 18:09:23 +02:00 committed by Tom Rini
parent b5d32ea42b
commit 57b812fc8f
1 changed files with 52 additions and 2 deletions
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54
drivers/firmware/scmi/smccc_agent.c
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@ -30,6 +30,14 @@ struct scmi_smccc_channel {
struct scmi_smt smt; struct scmi_smt smt;
}; };
/**
* struct scmi_channel - Channel instance referenced in SCMI drivers
* @ref: Reference to local channel instance
**/
struct scmi_channel {
struct scmi_smccc_channel ref;
};
static int scmi_smccc_process_msg(struct udevice *dev, static int scmi_smccc_process_msg(struct udevice *dev,
struct scmi_channel *channel, struct scmi_channel *channel,
struct scmi_msg *msg) struct scmi_msg *msg)
@ -38,6 +46,10 @@ static int scmi_smccc_process_msg(struct udevice *dev,
struct arm_smccc_res res; struct arm_smccc_res res;
int ret; int ret;
/* Support SCMI drivers upgraded to of_get_channel operator */
if (channel)
chan = &channel->ref;
ret = scmi_write_msg_to_smt(dev, &chan->smt, msg); ret = scmi_write_msg_to_smt(dev, &chan->smt, msg);
if (ret) if (ret)
return ret; return ret;
@ -53,9 +65,8 @@ static int scmi_smccc_process_msg(struct udevice *dev,
return ret; return ret;
} }
static int scmi_smccc_of_to_plat(struct udevice *dev) static int setup_channel(struct udevice *dev, struct scmi_smccc_channel *chan)
{ {
struct scmi_smccc_channel *chan = dev_get_plat(dev);
u32 func_id; u32 func_id;
int ret; int ret;
@ -73,12 +84,51 @@ static int scmi_smccc_of_to_plat(struct udevice *dev)
return ret; return ret;
} }
static int scmi_smccc_get_channel(struct udevice *dev,
struct scmi_channel **channel)
{
struct scmi_smccc_channel *base_chan = dev_get_plat(dev->parent);
struct scmi_smccc_channel *chan;
u32 func_id;
int ret;
if (dev_read_u32(dev, "arm,smc-id", &func_id)) {
/* Uses agent base channel */
*channel = container_of(base_chan, struct scmi_channel, ref);
return 0;
}
/* Setup a dedicated channel */
chan = calloc(1, sizeof(*chan));
if (!chan)
return -ENOMEM;
ret = setup_channel(dev, chan);
if (ret) {
free(chan);
return ret;
}
*channel = container_of(chan, struct scmi_channel, ref);
return 0;
}
static int scmi_smccc_of_to_plat(struct udevice *dev)
{
struct scmi_smccc_channel *chan = dev_get_plat(dev);
return setup_channel(dev, chan);
}
static const struct udevice_id scmi_smccc_ids[] = { static const struct udevice_id scmi_smccc_ids[] = {
{ .compatible = "arm,scmi-smc" }, { .compatible = "arm,scmi-smc" },
{ } { }
}; };
static const struct scmi_agent_ops scmi_smccc_ops = { static const struct scmi_agent_ops scmi_smccc_ops = {
.of_get_channel = scmi_smccc_get_channel,
.process_msg = scmi_smccc_process_msg, .process_msg = scmi_smccc_process_msg,
}; };