@@ -37,6 +37,86 @@ static const struct error_code scmi_linux_errmap[] = {
{ .scmi = SCMI_PROTOCOL_ERROR, .errno = -EPROTO, },
};
+/*
+ * NOTE: The only one instance should exist according to
+ * the current specification and device tree bindings.
+ */
+struct udevice *scmi_agent;
+
+struct udevice *scmi_get_protocol(struct udevice *dev,
+ enum scmi_std_protocol id)
+{
+ struct scmi_agent_priv *priv;
+ struct udevice *proto;
+
+ priv = dev_get_uclass_plat(dev);
+ if (!priv) {
+ dev_err(dev, "No priv data found\n");
+ return NULL;
+ }
+
+ switch (id) {
+ case SCMI_PROTOCOL_ID_CLOCK:
+ proto = priv->clock_dev;
+ break;
+ case SCMI_PROTOCOL_ID_RESET_DOMAIN:
+ proto = priv->resetdom_dev;
+ break;
+ case SCMI_PROTOCOL_ID_VOLTAGE_DOMAIN:
+ proto = priv->voltagedom_dev;
+ break;
+ default:
+ dev_err(dev, "Protocol not supported\n");
+ proto = NULL;
+ break;
+ }
+ if (proto && device_probe(proto))
+ dev_err(dev, "Probe failed\n");
+
+ return proto;
+}
+
+/**
+ * scmi_add_protocol - add protocol to agent
+ * @dev: SCMI device
+ * @proto_id: Identifier of protocol
+ * @proto: Device of protocol instance
+ *
+ * Associate the protocol instance, @proto, to the agent, @dev,
+ * for later use.
+ *
+ * Return: 0 on success, error code otherwise
+ */
+static int scmi_add_protocol(struct udevice *dev,
+ enum scmi_std_protocol proto_id,
+ struct udevice *proto)
+{
+ struct scmi_agent_priv *priv;
+
+ priv = dev_get_uclass_plat(dev);
+ if (!priv) {
+ dev_err(dev, "No priv data found\n");
+ return -ENODEV;
+ }
+
+ switch (proto_id) {
+ case SCMI_PROTOCOL_ID_CLOCK:
+ priv->clock_dev = proto;
+ break;
+ case SCMI_PROTOCOL_ID_RESET_DOMAIN:
+ priv->resetdom_dev = proto;
+ break;
+ case SCMI_PROTOCOL_ID_VOLTAGE_DOMAIN:
+ priv->voltagedom_dev = proto;
+ break;
+ default:
+ dev_err(dev, "Protocol not supported\n");
+ return -EPROTO;
+ }
+
+ return 0;
+}
+
int scmi_to_linux_errno(s32 scmi_code)
{
int n;
@@ -61,9 +141,15 @@ static int scmi_bind_protocols(struct udevice *dev)
int ret = 0;
ofnode node;
const char *name;
+ struct driver *drv;
+ struct udevice *proto;
+
+ if (scmi_agent) {
+ dev_err(dev, "SCMI agent already exists: %s\n", dev->name);
+ return -EBUSY;
+ }
dev_for_each_subnode(node, dev) {
- struct driver *drv = NULL;
u32 protocol_id;
if (!ofnode_is_enabled(node))
@@ -72,6 +158,7 @@ static int scmi_bind_protocols(struct udevice *dev)
if (ofnode_read_u32(node, "reg", &protocol_id))
continue;
+ drv = NULL;
name = ofnode_get_name(node);
switch (protocol_id) {
case SCMI_PROTOCOL_ID_CLOCK:
@@ -102,11 +189,22 @@ static int scmi_bind_protocols(struct udevice *dev)
continue;
}
- ret = device_bind(dev, drv, name, NULL, node, NULL);
- if (ret)
+ ret = device_bind(dev, drv, name, NULL, node, &proto);
+ if (ret) {
+ dev_err(dev, "failed to bind %s protocol\n", drv->name);
break;
+ }
+ ret = scmi_add_protocol(dev, protocol_id, proto);
+ if (ret) {
+ dev_err(dev, "failed to add protocol: %s, ret: %d\n",
+ proto->name, ret);
+ break;
+ }
}
+ if (!ret)
+ scmi_agent = dev;
+
return ret;
}
@@ -168,4 +266,5 @@ UCLASS_DRIVER(scmi_agent) = {
.id = UCLASS_SCMI_AGENT,
.name = "scmi_agent",
.post_bind = scmi_bind_protocols,
+ .per_device_plat_auto = sizeof(struct scmi_agent_priv),
};
@@ -9,6 +9,18 @@ struct udevice;
struct scmi_msg;
struct scmi_channel;
+/**
+ * struct scmi_agent_priv - private data maintained by agent instance
+ * @clock_dev: SCMI clock protocol device
+ * @clock_dev: SCMI reset domain protocol device
+ * @clock_dev: SCMI voltage domain protocol device
+ */
+struct scmi_agent_priv {
+ struct udevice *clock_dev;
+ struct udevice *resetdom_dev;
+ struct udevice *voltagedom_dev;
+};
+
/**
* struct scmi_transport_ops - The functions that a SCMI transport layer must implement.
*/
@@ -11,6 +11,7 @@
#define SCMI_AGENT_H
#include <asm/types.h>
+#include <scmi_protocols.h>
struct udevice;
struct scmi_channel;
@@ -69,6 +70,19 @@ int devm_scmi_of_get_channel(struct udevice *dev, struct scmi_channel **channel)
int devm_scmi_process_msg(struct udevice *dev, struct scmi_channel *channel,
struct scmi_msg *msg);
+/**
+ * scmi_get_protocol() - get protocol instance
+ *
+ * @dev: SCMI device
+ * @id: Identifier of protocol
+ *
+ * Obtain the device instance for given protocol ID, @id.
+ *
+ * Return: Pointer to the device if found, null otherwise
+ */
+struct udevice *scmi_get_protocol(struct udevice *dev,
+ enum scmi_std_protocol id);
+
/**
* scmi_to_linux_errno() - Convert an SCMI error code into a Linux errno code
*
This framework allows SCMI protocols to be installed and bound to the agent so that the agent can manage and utilize them later. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> --- drivers/firmware/scmi/scmi_agent-uclass.c | 105 +++++++++++++++++++++- include/scmi_agent-uclass.h | 12 +++ include/scmi_agent.h | 14 +++ 3 files changed, 128 insertions(+), 3 deletions(-)