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https://github.com/AsahiLinux/u-boot
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1f213ee4db
Implement voltage regulators interfaced by the SCMI voltage domain protocol. The DT bindings are defined in the Linux kernel since SCMI voltage domain and regulators patches [1] and [2] integration in v5.11-rc7. Link: [1]0f80fcec08Link: [2]2add5cacffSigned-off-by: Etienne Carriere <etienne.carriere@linaro.org> Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
131 lines
3 KiB
C
131 lines
3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2020 Linaro Limited.
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*/
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#define LOG_CATEGORY UCLASS_SCMI_AGENT
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <scmi_agent-uclass.h>
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#include <scmi_protocols.h>
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#include <dm/device_compat.h>
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#include <dm/device-internal.h>
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#include <linux/compat.h>
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/**
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* struct error_code - Helper structure for SCMI error code conversion
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* @scmi: SCMI error code
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* @errno: Related standard error number
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*/
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struct error_code {
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int scmi;
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int errno;
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};
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static const struct error_code scmi_linux_errmap[] = {
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{ .scmi = SCMI_NOT_SUPPORTED, .errno = -EOPNOTSUPP, },
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{ .scmi = SCMI_INVALID_PARAMETERS, .errno = -EINVAL, },
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{ .scmi = SCMI_DENIED, .errno = -EACCES, },
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{ .scmi = SCMI_NOT_FOUND, .errno = -ENOENT, },
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{ .scmi = SCMI_OUT_OF_RANGE, .errno = -ERANGE, },
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{ .scmi = SCMI_BUSY, .errno = -EBUSY, },
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{ .scmi = SCMI_COMMS_ERROR, .errno = -ECOMM, },
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{ .scmi = SCMI_GENERIC_ERROR, .errno = -EIO, },
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{ .scmi = SCMI_HARDWARE_ERROR, .errno = -EREMOTEIO, },
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{ .scmi = SCMI_PROTOCOL_ERROR, .errno = -EPROTO, },
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};
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int scmi_to_linux_errno(s32 scmi_code)
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{
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int n;
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if (!scmi_code)
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return 0;
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for (n = 0; n < ARRAY_SIZE(scmi_linux_errmap); n++)
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if (scmi_code == scmi_linux_errmap[n].scmi)
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return scmi_linux_errmap[1].errno;
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return -EPROTO;
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}
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/*
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* SCMI agent devices binds devices of various uclasses depeding on
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* the FDT description. scmi_bind_protocol() is a generic bind sequence
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* called by the uclass at bind stage, that is uclass post_bind.
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*/
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static int scmi_bind_protocols(struct udevice *dev)
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{
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int ret = 0;
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ofnode node;
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dev_for_each_subnode(node, dev) {
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struct driver *drv = NULL;
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u32 protocol_id;
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if (!ofnode_is_available(node))
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continue;
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if (ofnode_read_u32(node, "reg", &protocol_id))
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continue;
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switch (protocol_id) {
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case SCMI_PROTOCOL_ID_CLOCK:
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if (IS_ENABLED(CONFIG_CLK_SCMI))
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drv = DM_DRIVER_GET(scmi_clock);
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break;
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case SCMI_PROTOCOL_ID_RESET_DOMAIN:
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if (IS_ENABLED(CONFIG_RESET_SCMI))
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drv = DM_DRIVER_GET(scmi_reset_domain);
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break;
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case SCMI_PROTOCOL_ID_VOLTAGE_DOMAIN:
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if (IS_ENABLED(CONFIG_DM_REGULATOR_SCMI)) {
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node = ofnode_find_subnode(node, "regulators");
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if (!ofnode_valid(node)) {
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dev_err(dev, "no regulators node\n");
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return -ENXIO;
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}
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drv = DM_DRIVER_GET(scmi_voltage_domain);
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}
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break;
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default:
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break;
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}
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if (!drv) {
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dev_dbg(dev, "Ignore unsupported SCMI protocol %#x\n",
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protocol_id);
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continue;
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}
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ret = device_bind(dev, drv, ofnode_get_name(node), NULL, node,
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NULL);
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if (ret)
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break;
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}
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return ret;
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}
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static const struct scmi_agent_ops *transport_dev_ops(struct udevice *dev)
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{
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return (const struct scmi_agent_ops *)dev->driver->ops;
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}
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int devm_scmi_process_msg(struct udevice *dev, struct scmi_msg *msg)
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{
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const struct scmi_agent_ops *ops = transport_dev_ops(dev);
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if (ops->process_msg)
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return ops->process_msg(dev, msg);
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return -EPROTONOSUPPORT;
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}
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UCLASS_DRIVER(scmi_agent) = {
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.id = UCLASS_SCMI_AGENT,
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.name = "scmi_agent",
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.post_bind = scmi_bind_protocols,
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};
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