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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/firmware/arm_scmi/reset.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/firmware/arm_scmi/reset.c')
-rw-r--r-- | drivers/firmware/arm_scmi/reset.c | 356 |
1 files changed, 356 insertions, 0 deletions
diff --git a/drivers/firmware/arm_scmi/reset.c b/drivers/firmware/arm_scmi/reset.c new file mode 100644 index 0000000000..e9afa8cab7 --- /dev/null +++ b/drivers/firmware/arm_scmi/reset.c @@ -0,0 +1,356 @@ +// 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) |