[PATCH v4 04/13] firmware: scmi: framework for installing additional protocols
AKASHI Takahiro
takahiro.akashi at linaro.org
Tue Sep 12 08:19:53 CEST 2023
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 at linaro.org>
Reviewed-by: Simon Glass <sjg at chromium.org>
Reviewed-by: Etienne Carriere <etienne.carriere at foss.st.com>
---
V4
* remove 'agent' variable as it should be added in the following commit
v3
* move "per_device_plat_auto" from a earlier patch
* fix comments in "scmi_agent_priv"
* modify an order of include files in scmi_agent.h
v2
* check for availability of protocols
---
drivers/firmware/scmi/scmi_agent-uclass.c | 100 +++++++++++++++++++++-
include/scmi_agent-uclass.h | 15 +++-
include/scmi_agent.h | 14 +++
3 files changed, 125 insertions(+), 4 deletions(-)
diff --git a/drivers/firmware/scmi/scmi_agent-uclass.c b/drivers/firmware/scmi/scmi_agent-uclass.c
index 0b97569eb1a0..64878f04359e 100644
--- a/drivers/firmware/scmi/scmi_agent-uclass.c
+++ b/drivers/firmware/scmi/scmi_agent-uclass.c
@@ -38,6 +38,86 @@ 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 agent device
+ * @proto_id: SCMI protocol ID
+ * @proto: SCMI protocol device
+ *
+ * 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;
@@ -167,9 +247,10 @@ static int scmi_bind_protocols(struct udevice *dev)
int ret = 0;
ofnode node;
const char *name;
+ struct driver *drv;
+ struct udevice *proto;
dev_for_each_subnode(node, dev) {
- struct driver *drv = NULL;
u32 protocol_id;
if (!ofnode_is_enabled(node))
@@ -178,6 +259,7 @@ 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:
@@ -208,11 +290,22 @@ 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;
}
@@ -220,5 +313,6 @@ 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),
.per_child_auto = sizeof(struct scmi_agent_proto_priv *),
};
diff --git a/include/scmi_agent-uclass.h b/include/scmi_agent-uclass.h
index b1c93532c0ea..3358c2b2d804 100644
--- a/include/scmi_agent-uclass.h
+++ b/include/scmi_agent-uclass.h
@@ -5,10 +5,23 @@
#ifndef _SCMI_AGENT_UCLASS_H
#define _SCMI_AGENT_UCLASS_H
-struct udevice;
+#include <dm/device.h>
+
struct scmi_msg;
struct scmi_channel;
+/**
+ * struct scmi_agent_priv - private data maintained by agent instance
+ * @clock_dev: SCMI clock protocol device
+ * @resetdom_dev: SCMI reset domain protocol device
+ * @voltagedom_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.
*/
diff --git a/include/scmi_agent.h b/include/scmi_agent.h
index 577892029ff8..755986d6c424 100644
--- a/include/scmi_agent.h
+++ b/include/scmi_agent.h
@@ -10,6 +10,7 @@
#ifndef SCMI_AGENT_H
#define SCMI_AGENT_H
+#include <scmi_protocols.h>
#include <asm/types.h>
struct udevice;
@@ -74,6 +75,19 @@ int devm_scmi_of_get_channel(struct udevice *dev);
*/
int devm_scmi_process_msg(struct udevice *dev, struct scmi_msg *msg);
+/**
+ * scmi_get_protocol() - get protocol instance
+ *
+ * @dev: SCMI agent device
+ * @id: SCMI protocol ID
+ *
+ * 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
*
--
2.34.1
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