drivers/firmware/arm_scmi/reset.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * System Control and Management Interface (SCMI) Reset Protocol
  *
  * Copyright (C) 2019-2022 ARM Ltd.
  */

 #define pr_fmt(fmt) "SCMI Notifications RESET - " fmt

 #include <linux/module.h>
 #include <linux/scmi_protocol.h>

 #include "protocols.h"
 #include "notify.h"

 enum scmi_reset_protocol_cmd {
 	RESET_DOMAIN_ATTRIBUTES = 0x3,
 	RESET = 0x4,
 	RESET_NOTIFY = 0x5,
 	RESET_DOMAIN_NAME_GET = 0x6,
 };

 #define NUM_RESET_DOMAIN_MASK	0xffff
 #define RESET_NOTIFY_ENABLE	BIT(0)

 struct scmi_msg_resp_reset_domain_attributes {
 	__le32 attributes;
 #define SUPPORTS_ASYNC_RESET(x)		((x) & BIT(31))
 #define SUPPORTS_NOTIFY_RESET(x)	((x) & BIT(30))
 #define SUPPORTS_EXTENDED_NAMES(x)	((x) & BIT(29))
 	__le32 latency;
 	u8 name[SCMI_SHORT_NAME_MAX_SIZE];
 };

 struct scmi_msg_reset_domain_reset {
 	__le32 domain_id;
 	__le32 flags;
 #define AUTONOMOUS_RESET	BIT(0)
 #define EXPLICIT_RESET_ASSERT	BIT(1)
 #define ASYNCHRONOUS_RESET	BIT(2)
 	__le32 reset_state;
 #define ARCH_COLD_RESET		0
 };

 struct scmi_msg_reset_notify {
 	__le32 id;
 	__le32 event_control;
 #define RESET_TP_NOTIFY_ALL	BIT(0)
 };

 struct scmi_reset_issued_notify_payld {
 	__le32 agent_id;
 	__le32 domain_id;
 	__le32 reset_state;
 };

 struct reset_dom_info {
 	bool async_reset;
 	bool reset_notify;
 	u32 latency_us;
 	char name[SCMI_MAX_STR_SIZE];
 };

 struct scmi_reset_info {
 	u32 version;
 	int num_domains;
 	struct reset_dom_info *dom_info;
 };

 static int scmi_reset_attributes_get(const struct scmi_protocol_handle *ph,
 				     struct scmi_reset_info *pi)
 {
 	int ret;
 	struct scmi_xfer *t;
 	u32 attr;

 	ret = ph->xops->xfer_get_init(ph, PROTOCOL_ATTRIBUTES,
 				      0, sizeof(attr), &t);
 	if (ret)
 		return ret;

 	ret = ph->xops->do_xfer(ph, t);
 	if (!ret) {
 		attr = get_unaligned_le32(t->rx.buf);
 		pi->num_domains = attr & NUM_RESET_DOMAIN_MASK;
 	}

 	ph->xops->xfer_put(ph, t);
 	return ret;
 }

 static int
 scmi_reset_domain_attributes_get(const struct scmi_protocol_handle *ph,
 				 u32 domain, struct reset_dom_info *dom_info,
 				 u32 version)
 {
 	int ret;
 	u32 attributes;
 	struct scmi_xfer *t;
 	struct scmi_msg_resp_reset_domain_attributes *attr;

 	ret = ph->xops->xfer_get_init(ph, RESET_DOMAIN_ATTRIBUTES,
 				      sizeof(domain), sizeof(*attr), &t);
 	if (ret)
 		return ret;

 	put_unaligned_le32(domain, t->tx.buf);
 	attr = t->rx.buf;

 	ret = ph->xops->do_xfer(ph, t);
 	if (!ret) {
 		attributes = le32_to_cpu(attr->attributes);

 		dom_info->async_reset = SUPPORTS_ASYNC_RESET(attributes);
 		dom_info->reset_notify = SUPPORTS_NOTIFY_RESET(attributes);
 		dom_info->latency_us = le32_to_cpu(attr->latency);
 		if (dom_info->latency_us == U32_MAX)
 			dom_info->latency_us = 0;
 		strscpy(dom_info->name, attr->name, SCMI_SHORT_NAME_MAX_SIZE);
 	}

 	ph->xops->xfer_put(ph, t);

 	/*
 	 * If supported overwrite short name with the extended one;
 	 * on error just carry on and use already provided short name.
 	 */
 	if (!ret && PROTOCOL_REV_MAJOR(version) >= 0x3 &&
 	    SUPPORTS_EXTENDED_NAMES(attributes))
 		ph->hops->extended_name_get(ph, RESET_DOMAIN_NAME_GET, domain,
 					    dom_info->name, SCMI_MAX_STR_SIZE);

 	return ret;
 }

 static int scmi_reset_num_domains_get(const struct scmi_protocol_handle *ph)
 {
 	struct scmi_reset_info *pi = ph->get_priv(ph);

 	return pi->num_domains;
 }

 static const char *
 scmi_reset_name_get(const struct scmi_protocol_handle *ph, u32 domain)
 {
 	struct scmi_reset_info *pi = ph->get_priv(ph);

 	struct reset_dom_info *dom = pi->dom_info + domain;

 	return dom->name;
 }

 static int scmi_reset_latency_get(const struct scmi_protocol_handle *ph,
 				  u32 domain)
 {
 	struct scmi_reset_info *pi = ph->get_priv(ph);
 	struct reset_dom_info *dom = pi->dom_info + domain;

 	return dom->latency_us;
 }

 static int scmi_domain_reset(const struct scmi_protocol_handle *ph, u32 domain,
 			     u32 flags, u32 state)
 {
 	int ret;
 	struct scmi_xfer *t;
 	struct scmi_msg_reset_domain_reset *dom;
 	struct scmi_reset_info *pi = ph->get_priv(ph);
 	struct reset_dom_info *rdom;

 	if (domain >= pi->num_domains)
 		return -EINVAL;

 	rdom = pi->dom_info + domain;
 	if (rdom->async_reset && flags & AUTONOMOUS_RESET)
 		flags |= ASYNCHRONOUS_RESET;

 	ret = ph->xops->xfer_get_init(ph, RESET, sizeof(*dom), 0, &t);
 	if (ret)
 		return ret;

 	dom = t->tx.buf;
 	dom->domain_id = cpu_to_le32(domain);
 	dom->flags = cpu_to_le32(flags);
 	dom->reset_state = cpu_to_le32(state);

 	if (flags & ASYNCHRONOUS_RESET)
 		ret = ph->xops->do_xfer_with_response(ph, t);
 	else
 		ret = ph->xops->do_xfer(ph, t);

 	ph->xops->xfer_put(ph, t);
 	return ret;
 }

 static int scmi_reset_domain_reset(const struct scmi_protocol_handle *ph,
 				   u32 domain)
 {
 	return scmi_domain_reset(ph, domain, AUTONOMOUS_RESET,
 				 ARCH_COLD_RESET);
 }

 static int
 scmi_reset_domain_assert(const struct scmi_protocol_handle *ph, u32 domain)
 {
 	return scmi_domain_reset(ph, domain, EXPLICIT_RESET_ASSERT,
 				 ARCH_COLD_RESET);
 }

 static int
 scmi_reset_domain_deassert(const struct scmi_protocol_handle *ph, u32 domain)
 {
 	return scmi_domain_reset(ph, domain, 0, ARCH_COLD_RESET);
 }

 static const struct scmi_reset_proto_ops reset_proto_ops = {
 	.num_domains_get = scmi_reset_num_domains_get,
 	.name_get = scmi_reset_name_get,
 	.latency_get = scmi_reset_latency_get,
 	.reset = scmi_reset_domain_reset,
 	.assert = scmi_reset_domain_assert,
 	.deassert = scmi_reset_domain_deassert,
 };

 static int scmi_reset_notify(const struct scmi_protocol_handle *ph,
 			     u32 domain_id, bool enable)
 {
 	int ret;
 	u32 evt_cntl = enable ? RESET_TP_NOTIFY_ALL : 0;
 	struct scmi_xfer *t;
 	struct scmi_msg_reset_notify *cfg;

 	ret = ph->xops->xfer_get_init(ph, RESET_NOTIFY, sizeof(*cfg), 0, &t);
 	if (ret)
 		return ret;

 	cfg = t->tx.buf;
 	cfg->id = cpu_to_le32(domain_id);
 	cfg->event_control = cpu_to_le32(evt_cntl);

 	ret = ph->xops->do_xfer(ph, t);

 	ph->xops->xfer_put(ph, t);
 	return ret;
 }

 static int scmi_reset_set_notify_enabled(const struct scmi_protocol_handle *ph,
 					 u8 evt_id, u32 src_id, bool enable)
 {
 	int ret;

 	ret = scmi_reset_notify(ph, src_id, enable);
 	if (ret)
 		pr_debug("FAIL_ENABLED - evt[%X] dom[%d] - ret:%d\n",
 			 evt_id, src_id, ret);

 	return ret;
 }

 static void *
 scmi_reset_fill_custom_report(const struct scmi_protocol_handle *ph,
 			      u8 evt_id, ktime_t timestamp,
 			      const void *payld, size_t payld_sz,
 			      void *report, u32 *src_id)
 {
 	const struct scmi_reset_issued_notify_payld *p = payld;
 	struct scmi_reset_issued_report *r = report;

 	if (evt_id != SCMI_EVENT_RESET_ISSUED || sizeof(*p) != payld_sz)
 		return NULL;

 	r->timestamp = timestamp;
 	r->agent_id = le32_to_cpu(p->agent_id);
 	r->domain_id = le32_to_cpu(p->domain_id);
 	r->reset_state = le32_to_cpu(p->reset_state);
 	*src_id = r->domain_id;

 	return r;
 }

 static int scmi_reset_get_num_sources(const struct scmi_protocol_handle *ph)
 {
 	struct scmi_reset_info *pinfo = ph->get_priv(ph);

 	if (!pinfo)
 		return -EINVAL;

 	return pinfo->num_domains;
 }

 static const struct scmi_event reset_events[] = {
 	{
 		.id = SCMI_EVENT_RESET_ISSUED,
 		.max_payld_sz = sizeof(struct scmi_reset_issued_notify_payld),
 		.max_report_sz = sizeof(struct scmi_reset_issued_report),
 	},
 };

 static const struct scmi_event_ops reset_event_ops = {
 	.get_num_sources = scmi_reset_get_num_sources,
 	.set_notify_enabled = scmi_reset_set_notify_enabled,
 	.fill_custom_report = scmi_reset_fill_custom_report,
 };

 static const struct scmi_protocol_events reset_protocol_events = {
 	.queue_sz = SCMI_PROTO_QUEUE_SZ,
 	.ops = &reset_event_ops,
 	.evts = reset_events,
 	.num_events = ARRAY_SIZE(reset_events),
 };

 static int scmi_reset_protocol_init(const struct scmi_protocol_handle *ph)
 {
 	int domain, ret;
 	u32 version;
 	struct scmi_reset_info *pinfo;

 	ret = ph->xops->version_get(ph, &version);
 	if (ret)
 		return ret;

 	dev_dbg(ph->dev, "Reset Version %d.%d\n",
 		PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));

 	pinfo = devm_kzalloc(ph->dev, sizeof(*pinfo), GFP_KERNEL);
 	if (!pinfo)
 		return -ENOMEM;

 	ret = scmi_reset_attributes_get(ph, pinfo);
 	if (ret)
 		return ret;

 	pinfo->dom_info = devm_kcalloc(ph->dev, pinfo->num_domains,
 				       sizeof(*pinfo->dom_info), GFP_KERNEL);
 	if (!pinfo->dom_info)
 		return -ENOMEM;

 	for (domain = 0; domain < pinfo->num_domains; domain++) {
 		struct reset_dom_info *dom = pinfo->dom_info + domain;

 		scmi_reset_domain_attributes_get(ph, domain, dom, version);
 	}

 	pinfo->version = version;
 	return ph->set_priv(ph, pinfo);
 }

 static const struct scmi_protocol scmi_reset = {
 	.id = SCMI_PROTOCOL_RESET,
 	.owner = THIS_MODULE,
 	.instance_init = &scmi_reset_protocol_init,
 	.ops = &reset_proto_ops,
 	.events = &reset_protocol_events,
 };

 DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(reset, scmi_reset)
	// SPDX-License-Identifier: GPL-2.0
	/*
	* System Control and Management Interface (SCMI) Reset Protocol
	*
	* Copyright (C) 2019-2022 ARM Ltd.
	*/

	#define pr_fmt(fmt) "SCMI Notifications RESET - " fmt

	#include <linux/module.h>
	#include <linux/scmi_protocol.h>

	#include "protocols.h"
	#include "notify.h"

	enum scmi_reset_protocol_cmd {
	RESET_DOMAIN_ATTRIBUTES = 0x3,
	RESET = 0x4,
	RESET_NOTIFY = 0x5,
	RESET_DOMAIN_NAME_GET = 0x6,
	};

	#define NUM_RESET_DOMAIN_MASK 0xffff
	#define RESET_NOTIFY_ENABLE BIT(0)

	struct scmi_msg_resp_reset_domain_attributes {
	__le32 attributes;
	#define SUPPORTS_ASYNC_RESET(x) ((x) & BIT(31))
	#define SUPPORTS_NOTIFY_RESET(x) ((x) & BIT(30))
	#define SUPPORTS_EXTENDED_NAMES(x) ((x) & BIT(29))
	__le32 latency;
	u8 name[SCMI_SHORT_NAME_MAX_SIZE];
	};

	struct scmi_msg_reset_domain_reset {
	__le32 domain_id;
	__le32 flags;
	#define AUTONOMOUS_RESET BIT(0)
	#define EXPLICIT_RESET_ASSERT BIT(1)
	#define ASYNCHRONOUS_RESET BIT(2)
	__le32 reset_state;
	#define ARCH_COLD_RESET 0
	};

	struct scmi_msg_reset_notify {
	__le32 id;
	__le32 event_control;
	#define RESET_TP_NOTIFY_ALL BIT(0)
	};

	struct scmi_reset_issued_notify_payld {
	__le32 agent_id;
	__le32 domain_id;
	__le32 reset_state;
	};

	struct reset_dom_info {
	bool async_reset;
	bool reset_notify;
	u32 latency_us;
	char name[SCMI_MAX_STR_SIZE];
	};

	struct scmi_reset_info {
	u32 version;
	int num_domains;
	struct reset_dom_info *dom_info;
	};

	static int scmi_reset_attributes_get(const struct scmi_protocol_handle *ph,
	struct scmi_reset_info *pi)
	{
	int ret;
	struct scmi_xfer *t;
	u32 attr;

	ret = ph->xops->xfer_get_init(ph, PROTOCOL_ATTRIBUTES,
	0, sizeof(attr), &t);
	if (ret)
	return ret;

	ret = ph->xops->do_xfer(ph, t);
	if (!ret) {
	attr = get_unaligned_le32(t->rx.buf);
	pi->num_domains = attr & NUM_RESET_DOMAIN_MASK;
	}

	ph->xops->xfer_put(ph, t);
	return ret;
	}

	static int
	scmi_reset_domain_attributes_get(const struct scmi_protocol_handle *ph,
	u32 domain, struct reset_dom_info *dom_info,
	u32 version)
	{
	int ret;
	u32 attributes;
	struct scmi_xfer *t;
	struct scmi_msg_resp_reset_domain_attributes *attr;

	ret = ph->xops->xfer_get_init(ph, RESET_DOMAIN_ATTRIBUTES,
	sizeof(domain), sizeof(*attr), &t);
	if (ret)
	return ret;

	put_unaligned_le32(domain, t->tx.buf);
	attr = t->rx.buf;

	ret = ph->xops->do_xfer(ph, t);
	if (!ret) {
	attributes = le32_to_cpu(attr->attributes);

	dom_info->async_reset = SUPPORTS_ASYNC_RESET(attributes);
	dom_info->reset_notify = SUPPORTS_NOTIFY_RESET(attributes);
	dom_info->latency_us = le32_to_cpu(attr->latency);
	if (dom_info->latency_us == U32_MAX)
	dom_info->latency_us = 0;
	strscpy(dom_info->name, attr->name, SCMI_SHORT_NAME_MAX_SIZE);
	}

	ph->xops->xfer_put(ph, t);

	/*
	* If supported overwrite short name with the extended one;
	* on error just carry on and use already provided short name.
	*/
	if (!ret && PROTOCOL_REV_MAJOR(version) >= 0x3 &&
	SUPPORTS_EXTENDED_NAMES(attributes))
	ph->hops->extended_name_get(ph, RESET_DOMAIN_NAME_GET, domain,
	dom_info->name, SCMI_MAX_STR_SIZE);

	return ret;
	}

	static int scmi_reset_num_domains_get(const struct scmi_protocol_handle *ph)
	{
	struct scmi_reset_info *pi = ph->get_priv(ph);

	return pi->num_domains;
	}

	static const char *
	scmi_reset_name_get(const struct scmi_protocol_handle *ph, u32 domain)
	{
	struct scmi_reset_info *pi = ph->get_priv(ph);

	struct reset_dom_info *dom = pi->dom_info + domain;

	return dom->name;
	}

	static int scmi_reset_latency_get(const struct scmi_protocol_handle *ph,
	u32 domain)
	{
	struct scmi_reset_info *pi = ph->get_priv(ph);
	struct reset_dom_info *dom = pi->dom_info + domain;

	return dom->latency_us;
	}

	static int scmi_domain_reset(const struct scmi_protocol_handle *ph, u32 domain,
	u32 flags, u32 state)
	{
	int ret;
	struct scmi_xfer *t;
	struct scmi_msg_reset_domain_reset *dom;
	struct scmi_reset_info *pi = ph->get_priv(ph);
	struct reset_dom_info *rdom;

	if (domain >= pi->num_domains)
	return -EINVAL;

	rdom = pi->dom_info + domain;
	if (rdom->async_reset && flags & AUTONOMOUS_RESET)
	flags \|= ASYNCHRONOUS_RESET;

	ret = ph->xops->xfer_get_init(ph, RESET, sizeof(*dom), 0, &t);
	if (ret)
	return ret;

	dom = t->tx.buf;
	dom->domain_id = cpu_to_le32(domain);
	dom->flags = cpu_to_le32(flags);
	dom->reset_state = cpu_to_le32(state);

	if (flags & ASYNCHRONOUS_RESET)
	ret = ph->xops->do_xfer_with_response(ph, t);
	else
	ret = ph->xops->do_xfer(ph, t);

	ph->xops->xfer_put(ph, t);
	return ret;
	}

	static int scmi_reset_domain_reset(const struct scmi_protocol_handle *ph,
	u32 domain)
	{
	return scmi_domain_reset(ph, domain, AUTONOMOUS_RESET,
	ARCH_COLD_RESET);
	}

	static int
	scmi_reset_domain_assert(const struct scmi_protocol_handle *ph, u32 domain)
	{
	return scmi_domain_reset(ph, domain, EXPLICIT_RESET_ASSERT,
	ARCH_COLD_RESET);
	}

	static int
	scmi_reset_domain_deassert(const struct scmi_protocol_handle *ph, u32 domain)
	{
	return scmi_domain_reset(ph, domain, 0, ARCH_COLD_RESET);
	}

	static const struct scmi_reset_proto_ops reset_proto_ops = {
	.num_domains_get = scmi_reset_num_domains_get,
	.name_get = scmi_reset_name_get,
	.latency_get = scmi_reset_latency_get,
	.reset = scmi_reset_domain_reset,
	.assert = scmi_reset_domain_assert,
	.deassert = scmi_reset_domain_deassert,
	};

	static int scmi_reset_notify(const struct scmi_protocol_handle *ph,
	u32 domain_id, bool enable)
	{
	int ret;
	u32 evt_cntl = enable ? RESET_TP_NOTIFY_ALL : 0;
	struct scmi_xfer *t;
	struct scmi_msg_reset_notify *cfg;

	ret = ph->xops->xfer_get_init(ph, RESET_NOTIFY, sizeof(*cfg), 0, &t);
	if (ret)
	return ret;

	cfg = t->tx.buf;
	cfg->id = cpu_to_le32(domain_id);
	cfg->event_control = cpu_to_le32(evt_cntl);

	ret = ph->xops->do_xfer(ph, t);

	ph->xops->xfer_put(ph, t);
	return ret;
	}

	static int scmi_reset_set_notify_enabled(const struct scmi_protocol_handle *ph,
	u8 evt_id, u32 src_id, bool enable)
	{
	int ret;

	ret = scmi_reset_notify(ph, src_id, enable);
	if (ret)
	pr_debug("FAIL_ENABLED - evt[%X] dom[%d] - ret:%d\n",
	evt_id, src_id, ret);

	return ret;
	}

	static void *
	scmi_reset_fill_custom_report(const struct scmi_protocol_handle *ph,
	u8 evt_id, ktime_t timestamp,
	const void *payld, size_t payld_sz,
	void report, u32 src_id)
	{
	const struct scmi_reset_issued_notify_payld *p = payld;
	struct scmi_reset_issued_report *r = report;

	if (evt_id != SCMI_EVENT_RESET_ISSUED \|\| sizeof(*p) != payld_sz)
	return NULL;

	r->timestamp = timestamp;
	r->agent_id = le32_to_cpu(p->agent_id);
	r->domain_id = le32_to_cpu(p->domain_id);
	r->reset_state = le32_to_cpu(p->reset_state);
	*src_id = r->domain_id;

	return r;
	}

	static int scmi_reset_get_num_sources(const struct scmi_protocol_handle *ph)
	{
	struct scmi_reset_info *pinfo = ph->get_priv(ph);

	if (!pinfo)
	return -EINVAL;

	return pinfo->num_domains;
	}

	static const struct scmi_event reset_events[] = {
	{
	.id = SCMI_EVENT_RESET_ISSUED,
	.max_payld_sz = sizeof(struct scmi_reset_issued_notify_payld),
	.max_report_sz = sizeof(struct scmi_reset_issued_report),
	},
	};

	static const struct scmi_event_ops reset_event_ops = {
	.get_num_sources = scmi_reset_get_num_sources,
	.set_notify_enabled = scmi_reset_set_notify_enabled,
	.fill_custom_report = scmi_reset_fill_custom_report,
	};

	static const struct scmi_protocol_events reset_protocol_events = {
	.queue_sz = SCMI_PROTO_QUEUE_SZ,
	.ops = &reset_event_ops,
	.evts = reset_events,
	.num_events = ARRAY_SIZE(reset_events),
	};

	static int scmi_reset_protocol_init(const struct scmi_protocol_handle *ph)
	{
	int domain, ret;
	u32 version;
	struct scmi_reset_info *pinfo;

	ret = ph->xops->version_get(ph, &version);
	if (ret)
	return ret;

	dev_dbg(ph->dev, "Reset Version %d.%d\n",
	PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));

	pinfo = devm_kzalloc(ph->dev, sizeof(*pinfo), GFP_KERNEL);
	if (!pinfo)
	return -ENOMEM;

	ret = scmi_reset_attributes_get(ph, pinfo);
	if (ret)
	return ret;

	pinfo->dom_info = devm_kcalloc(ph->dev, pinfo->num_domains,
	sizeof(*pinfo->dom_info), GFP_KERNEL);
	if (!pinfo->dom_info)
	return -ENOMEM;

	for (domain = 0; domain < pinfo->num_domains; domain++) {
	struct reset_dom_info *dom = pinfo->dom_info + domain;

	scmi_reset_domain_attributes_get(ph, domain, dom, version);
	}

	pinfo->version = version;
	return ph->set_priv(ph, pinfo);
	}

	static const struct scmi_protocol scmi_reset = {
	.id = SCMI_PROTOCOL_RESET,
	.owner = THIS_MODULE,
	.instance_init = &scmi_reset_protocol_init,
	.ops = &reset_proto_ops,
	.events = &reset_protocol_events,
	};

	DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(reset, scmi_reset)