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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2020 Linaro Limited.
*/
#define LOG_CATEGORY UCLASS_SCMI_AGENT
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <scmi_agent.h>
#include <scmi_agent-uclass.h>
#include <scmi_protocols.h>
#include <dm/device_compat.h>
#include <dm/device-internal.h>
#include <linux/compat.h>
/**
* struct error_code - Helper structure for SCMI error code conversion
* @scmi: SCMI error code
* @errno: Related standard error number
*/
struct error_code {
int scmi;
int errno;
};
static const struct error_code scmi_linux_errmap[] = {
{ .scmi = SCMI_NOT_SUPPORTED, .errno = -EOPNOTSUPP, },
{ .scmi = SCMI_INVALID_PARAMETERS, .errno = -EINVAL, },
{ .scmi = SCMI_DENIED, .errno = -EACCES, },
{ .scmi = SCMI_NOT_FOUND, .errno = -ENOENT, },
{ .scmi = SCMI_OUT_OF_RANGE, .errno = -ERANGE, },
{ .scmi = SCMI_BUSY, .errno = -EBUSY, },
{ .scmi = SCMI_COMMS_ERROR, .errno = -ECOMM, },
{ .scmi = SCMI_GENERIC_ERROR, .errno = -EIO, },
{ .scmi = SCMI_HARDWARE_ERROR, .errno = -EREMOTEIO, },
{ .scmi = SCMI_PROTOCOL_ERROR, .errno = -EPROTO, },
};
int scmi_to_linux_errno(s32 scmi_code)
{
int n;
if (!scmi_code)
return 0;
for (n = 0; n < ARRAY_SIZE(scmi_linux_errmap); n++)
if (scmi_code == scmi_linux_errmap[n].scmi)
return scmi_linux_errmap[n].errno;
return -EPROTO;
}
/*
* SCMI agent devices binds devices of various uclasses depeding on
* the FDT description. scmi_bind_protocol() is a generic bind sequence
* called by the uclass at bind stage, that is uclass post_bind.
*/
static int scmi_bind_protocols(struct udevice *dev)
{
int ret = 0;
ofnode node;
const char *name;
dev_for_each_subnode(node, dev) {
struct driver *drv = NULL;
u32 protocol_id;
if (!ofnode_is_enabled(node))
continue;
if (ofnode_read_u32(node, "reg", &protocol_id))
continue;
name = ofnode_get_name(node);
switch (protocol_id) {
case SCMI_PROTOCOL_ID_CLOCK:
if (CONFIG_IS_ENABLED(CLK_SCMI))
drv = DM_DRIVER_GET(scmi_clock);
break;
case SCMI_PROTOCOL_ID_RESET_DOMAIN:
if (IS_ENABLED(CONFIG_RESET_SCMI))
drv = DM_DRIVER_GET(scmi_reset_domain);
break;
case SCMI_PROTOCOL_ID_VOLTAGE_DOMAIN:
if (IS_ENABLED(CONFIG_DM_REGULATOR_SCMI)) {
node = ofnode_find_subnode(node, "regulators");
if (!ofnode_valid(node)) {
dev_err(dev, "no regulators node\n");
return -ENXIO;
}
drv = DM_DRIVER_GET(scmi_voltage_domain);
}
break;
default:
break;
}
if (!drv) {
dev_dbg(dev, "Ignore unsupported SCMI protocol %#x\n",
protocol_id);
continue;
}
ret = device_bind(dev, drv, name, NULL, node, NULL);
if (ret)
break;
}
return ret;
}
static struct udevice *find_scmi_protocol_device(struct udevice *dev)
{
struct udevice *parent = NULL, *protocol;
for (protocol = dev; protocol; protocol = parent) {
parent = dev_get_parent(protocol);
if (!parent ||
device_get_uclass_id(parent) == UCLASS_SCMI_AGENT)
break;
}
if (!parent) {
dev_err(dev, "Invalid SCMI device, agent not found\n");
return NULL;
}
return protocol;
}
static const struct scmi_agent_ops *transport_dev_ops(struct udevice *dev)
{
return (const struct scmi_agent_ops *)dev->driver->ops;
}
/**
* scmi_of_get_channel() - Get SCMI channel handle
*
* @dev: SCMI agent device
* @channel: Output reference to the SCMI channel upon success
*
* On return, @channel will be set.
* Return 0 on success and a negative errno on failure
*/
static int scmi_of_get_channel(struct udevice *dev, struct scmi_channel **channel)
{
const struct scmi_agent_ops *ops;
ops = transport_dev_ops(dev);
if (ops->of_get_channel)
return ops->of_get_channel(dev, channel);
else
return -EPROTONOSUPPORT;
}
int devm_scmi_of_get_channel(struct udevice *dev)
{
struct udevice *protocol;
struct scmi_agent_proto_priv *priv;
int ret;
protocol = find_scmi_protocol_device(dev);
if (!protocol)
return -ENODEV;
priv = dev_get_parent_priv(protocol);
ret = scmi_of_get_channel(protocol->parent, &priv->channel);
if (ret == -EPROTONOSUPPORT) {
/* Drivers without a get_channel operator don't need a channel ref */
priv->channel = NULL;
return 0;
}
return ret;
}
/**
* scmi_process_msg() - Send and process an SCMI message
*
* Send a message to an SCMI server.
* Caller sets scmi_msg::out_msg_sz to the output message buffer size.
*
* @dev: SCMI agent device
* @channel: Communication channel for the device
* @msg: Message structure reference
*
* On return, scmi_msg::out_msg_sz stores the response payload size.
* Return: 0 on success and a negative errno on failure
*/
static int scmi_process_msg(struct udevice *dev, struct scmi_channel *channel,
struct scmi_msg *msg)
{
const struct scmi_agent_ops *ops;
ops = transport_dev_ops(dev);
if (ops->process_msg)
return ops->process_msg(dev, channel, msg);
else
return -EPROTONOSUPPORT;
}
int devm_scmi_process_msg(struct udevice *dev, struct scmi_msg *msg)
{
struct udevice *protocol;
struct scmi_agent_proto_priv *priv;
protocol = find_scmi_protocol_device(dev);
if (!protocol)
return -ENODEV;
priv = dev_get_parent_priv(protocol);
return scmi_process_msg(protocol->parent, priv->channel, msg);
}
UCLASS_DRIVER(scmi_agent) = {
.id = UCLASS_SCMI_AGENT,
.name = "scmi_agent",
.post_bind = scmi_bind_protocols,
.per_child_auto = sizeof(struct scmi_agent_proto_priv),
};
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