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path: root/drivers/firmware/arm_scmi/base.c
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Diffstat (limited to 'drivers/firmware/arm_scmi/base.c')
-rw-r--r--drivers/firmware/arm_scmi/base.c428
1 files changed, 428 insertions, 0 deletions
diff --git a/drivers/firmware/arm_scmi/base.c b/drivers/firmware/arm_scmi/base.c
new file mode 100644
index 000000000..a52f084a6
--- /dev/null
+++ b/drivers/firmware/arm_scmi/base.c
@@ -0,0 +1,428 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * System Control and Management Interface (SCMI) Base Protocol
+ *
+ * Copyright (C) 2018-2021 ARM Ltd.
+ */
+
+#define pr_fmt(fmt) "SCMI Notifications BASE - " fmt
+
+#include <linux/module.h>
+#include <linux/scmi_protocol.h>
+
+#include "common.h"
+#include "notify.h"
+
+#define SCMI_BASE_NUM_SOURCES 1
+#define SCMI_BASE_MAX_CMD_ERR_COUNT 1024
+
+enum scmi_base_protocol_cmd {
+ BASE_DISCOVER_VENDOR = 0x3,
+ BASE_DISCOVER_SUB_VENDOR = 0x4,
+ BASE_DISCOVER_IMPLEMENT_VERSION = 0x5,
+ BASE_DISCOVER_LIST_PROTOCOLS = 0x6,
+ BASE_DISCOVER_AGENT = 0x7,
+ BASE_NOTIFY_ERRORS = 0x8,
+ BASE_SET_DEVICE_PERMISSIONS = 0x9,
+ BASE_SET_PROTOCOL_PERMISSIONS = 0xa,
+ BASE_RESET_AGENT_CONFIGURATION = 0xb,
+};
+
+struct scmi_msg_resp_base_attributes {
+ u8 num_protocols;
+ u8 num_agents;
+ __le16 reserved;
+};
+
+struct scmi_msg_resp_base_discover_agent {
+ __le32 agent_id;
+ u8 name[SCMI_SHORT_NAME_MAX_SIZE];
+};
+
+
+struct scmi_msg_base_error_notify {
+ __le32 event_control;
+#define BASE_TP_NOTIFY_ALL BIT(0)
+};
+
+struct scmi_base_error_notify_payld {
+ __le32 agent_id;
+ __le32 error_status;
+#define IS_FATAL_ERROR(x) ((x) & BIT(31))
+#define ERROR_CMD_COUNT(x) FIELD_GET(GENMASK(9, 0), (x))
+ __le64 msg_reports[SCMI_BASE_MAX_CMD_ERR_COUNT];
+};
+
+/**
+ * scmi_base_attributes_get() - gets the implementation details
+ * that are associated with the base protocol.
+ *
+ * @ph: SCMI protocol handle
+ *
+ * Return: 0 on success, else appropriate SCMI error.
+ */
+static int scmi_base_attributes_get(const struct scmi_protocol_handle *ph)
+{
+ int ret;
+ struct scmi_xfer *t;
+ struct scmi_msg_resp_base_attributes *attr_info;
+ struct scmi_revision_info *rev = ph->get_priv(ph);
+
+ ret = ph->xops->xfer_get_init(ph, PROTOCOL_ATTRIBUTES,
+ 0, sizeof(*attr_info), &t);
+ if (ret)
+ return ret;
+
+ ret = ph->xops->do_xfer(ph, t);
+ if (!ret) {
+ attr_info = t->rx.buf;
+ rev->num_protocols = attr_info->num_protocols;
+ rev->num_agents = attr_info->num_agents;
+ }
+
+ ph->xops->xfer_put(ph, t);
+
+ return ret;
+}
+
+/**
+ * scmi_base_vendor_id_get() - gets vendor/subvendor identifier ASCII string.
+ *
+ * @ph: SCMI protocol handle
+ * @sub_vendor: specify true if sub-vendor ID is needed
+ *
+ * Return: 0 on success, else appropriate SCMI error.
+ */
+static int
+scmi_base_vendor_id_get(const struct scmi_protocol_handle *ph, bool sub_vendor)
+{
+ u8 cmd;
+ int ret, size;
+ char *vendor_id;
+ struct scmi_xfer *t;
+ struct scmi_revision_info *rev = ph->get_priv(ph);
+
+
+ if (sub_vendor) {
+ cmd = BASE_DISCOVER_SUB_VENDOR;
+ vendor_id = rev->sub_vendor_id;
+ size = ARRAY_SIZE(rev->sub_vendor_id);
+ } else {
+ cmd = BASE_DISCOVER_VENDOR;
+ vendor_id = rev->vendor_id;
+ size = ARRAY_SIZE(rev->vendor_id);
+ }
+
+ ret = ph->xops->xfer_get_init(ph, cmd, 0, size, &t);
+ if (ret)
+ return ret;
+
+ ret = ph->xops->do_xfer(ph, t);
+ if (!ret)
+ strscpy(vendor_id, t->rx.buf, size);
+
+ ph->xops->xfer_put(ph, t);
+
+ return ret;
+}
+
+/**
+ * scmi_base_implementation_version_get() - gets a vendor-specific
+ * implementation 32-bit version. The format of the version number is
+ * vendor-specific
+ *
+ * @ph: SCMI protocol handle
+ *
+ * Return: 0 on success, else appropriate SCMI error.
+ */
+static int
+scmi_base_implementation_version_get(const struct scmi_protocol_handle *ph)
+{
+ int ret;
+ __le32 *impl_ver;
+ struct scmi_xfer *t;
+ struct scmi_revision_info *rev = ph->get_priv(ph);
+
+ ret = ph->xops->xfer_get_init(ph, BASE_DISCOVER_IMPLEMENT_VERSION,
+ 0, sizeof(*impl_ver), &t);
+ if (ret)
+ return ret;
+
+ ret = ph->xops->do_xfer(ph, t);
+ if (!ret) {
+ impl_ver = t->rx.buf;
+ rev->impl_ver = le32_to_cpu(*impl_ver);
+ }
+
+ ph->xops->xfer_put(ph, t);
+
+ return ret;
+}
+
+/**
+ * scmi_base_implementation_list_get() - gets the list of protocols it is
+ * OSPM is allowed to access
+ *
+ * @ph: SCMI protocol handle
+ * @protocols_imp: pointer to hold the list of protocol identifiers
+ *
+ * Return: 0 on success, else appropriate SCMI error.
+ */
+static int
+scmi_base_implementation_list_get(const struct scmi_protocol_handle *ph,
+ u8 *protocols_imp)
+{
+ u8 *list;
+ int ret, loop;
+ struct scmi_xfer *t;
+ __le32 *num_skip, *num_ret;
+ u32 tot_num_ret = 0, loop_num_ret;
+ struct device *dev = ph->dev;
+ struct scmi_revision_info *rev = ph->get_priv(ph);
+
+ ret = ph->xops->xfer_get_init(ph, BASE_DISCOVER_LIST_PROTOCOLS,
+ sizeof(*num_skip), 0, &t);
+ if (ret)
+ return ret;
+
+ num_skip = t->tx.buf;
+ num_ret = t->rx.buf;
+ list = t->rx.buf + sizeof(*num_ret);
+
+ do {
+ size_t real_list_sz;
+ u32 calc_list_sz;
+
+ /* Set the number of protocols to be skipped/already read */
+ *num_skip = cpu_to_le32(tot_num_ret);
+
+ ret = ph->xops->do_xfer(ph, t);
+ if (ret)
+ break;
+
+ loop_num_ret = le32_to_cpu(*num_ret);
+ if (!loop_num_ret)
+ break;
+
+ if (loop_num_ret > rev->num_protocols - tot_num_ret) {
+ dev_err(dev,
+ "No. Returned protocols > Total protocols.\n");
+ break;
+ }
+
+ if (t->rx.len < (sizeof(u32) * 2)) {
+ dev_err(dev, "Truncated reply - rx.len:%zd\n",
+ t->rx.len);
+ ret = -EPROTO;
+ break;
+ }
+
+ real_list_sz = t->rx.len - sizeof(u32);
+ calc_list_sz = (1 + (loop_num_ret - 1) / sizeof(u32)) *
+ sizeof(u32);
+ if (calc_list_sz != real_list_sz) {
+ dev_warn(dev,
+ "Malformed reply - real_sz:%zd calc_sz:%u (loop_num_ret:%d)\n",
+ real_list_sz, calc_list_sz, loop_num_ret);
+ /*
+ * Bail out if the expected list size is bigger than the
+ * total payload size of the received reply.
+ */
+ if (calc_list_sz > real_list_sz) {
+ ret = -EPROTO;
+ break;
+ }
+ }
+
+ for (loop = 0; loop < loop_num_ret; loop++)
+ protocols_imp[tot_num_ret + loop] = *(list + loop);
+
+ tot_num_ret += loop_num_ret;
+
+ ph->xops->reset_rx_to_maxsz(ph, t);
+ } while (tot_num_ret < rev->num_protocols);
+
+ ph->xops->xfer_put(ph, t);
+
+ return ret;
+}
+
+/**
+ * scmi_base_discover_agent_get() - discover the name of an agent
+ *
+ * @ph: SCMI protocol handle
+ * @id: Agent identifier
+ * @name: Agent identifier ASCII string
+ *
+ * An agent id of 0 is reserved to identify the platform itself.
+ * Generally operating system is represented as "OSPM"
+ *
+ * Return: 0 on success, else appropriate SCMI error.
+ */
+static int scmi_base_discover_agent_get(const struct scmi_protocol_handle *ph,
+ int id, char *name)
+{
+ int ret;
+ struct scmi_msg_resp_base_discover_agent *agent_info;
+ struct scmi_xfer *t;
+
+ ret = ph->xops->xfer_get_init(ph, BASE_DISCOVER_AGENT,
+ sizeof(__le32), sizeof(*agent_info), &t);
+ if (ret)
+ return ret;
+
+ put_unaligned_le32(id, t->tx.buf);
+
+ ret = ph->xops->do_xfer(ph, t);
+ if (!ret) {
+ agent_info = t->rx.buf;
+ strscpy(name, agent_info->name, SCMI_SHORT_NAME_MAX_SIZE);
+ }
+
+ ph->xops->xfer_put(ph, t);
+
+ return ret;
+}
+
+static int scmi_base_error_notify(const struct scmi_protocol_handle *ph,
+ bool enable)
+{
+ int ret;
+ u32 evt_cntl = enable ? BASE_TP_NOTIFY_ALL : 0;
+ struct scmi_xfer *t;
+ struct scmi_msg_base_error_notify *cfg;
+
+ ret = ph->xops->xfer_get_init(ph, BASE_NOTIFY_ERRORS,
+ sizeof(*cfg), 0, &t);
+ if (ret)
+ return ret;
+
+ cfg = t->tx.buf;
+ 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_base_set_notify_enabled(const struct scmi_protocol_handle *ph,
+ u8 evt_id, u32 src_id, bool enable)
+{
+ int ret;
+
+ ret = scmi_base_error_notify(ph, enable);
+ if (ret)
+ pr_debug("FAIL_ENABLED - evt[%X] ret:%d\n", evt_id, ret);
+
+ return ret;
+}
+
+static void *scmi_base_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)
+{
+ int i;
+ const struct scmi_base_error_notify_payld *p = payld;
+ struct scmi_base_error_report *r = report;
+
+ /*
+ * BaseError notification payload is variable in size but
+ * up to a maximum length determined by the struct ponted by p.
+ * Instead payld_sz is the effective length of this notification
+ * payload so cannot be greater of the maximum allowed size as
+ * pointed by p.
+ */
+ if (evt_id != SCMI_EVENT_BASE_ERROR_EVENT || sizeof(*p) < payld_sz)
+ return NULL;
+
+ r->timestamp = timestamp;
+ r->agent_id = le32_to_cpu(p->agent_id);
+ r->fatal = IS_FATAL_ERROR(le32_to_cpu(p->error_status));
+ r->cmd_count = ERROR_CMD_COUNT(le32_to_cpu(p->error_status));
+ for (i = 0; i < r->cmd_count; i++)
+ r->reports[i] = le64_to_cpu(p->msg_reports[i]);
+ *src_id = 0;
+
+ return r;
+}
+
+static const struct scmi_event base_events[] = {
+ {
+ .id = SCMI_EVENT_BASE_ERROR_EVENT,
+ .max_payld_sz = sizeof(struct scmi_base_error_notify_payld),
+ .max_report_sz = sizeof(struct scmi_base_error_report) +
+ SCMI_BASE_MAX_CMD_ERR_COUNT * sizeof(u64),
+ },
+};
+
+static const struct scmi_event_ops base_event_ops = {
+ .set_notify_enabled = scmi_base_set_notify_enabled,
+ .fill_custom_report = scmi_base_fill_custom_report,
+};
+
+static const struct scmi_protocol_events base_protocol_events = {
+ .queue_sz = 4 * SCMI_PROTO_QUEUE_SZ,
+ .ops = &base_event_ops,
+ .evts = base_events,
+ .num_events = ARRAY_SIZE(base_events),
+ .num_sources = SCMI_BASE_NUM_SOURCES,
+};
+
+static int scmi_base_protocol_init(const struct scmi_protocol_handle *ph)
+{
+ int id, ret;
+ u8 *prot_imp;
+ u32 version;
+ char name[SCMI_SHORT_NAME_MAX_SIZE];
+ struct device *dev = ph->dev;
+ struct scmi_revision_info *rev = scmi_revision_area_get(ph);
+
+ ret = ph->xops->version_get(ph, &version);
+ if (ret)
+ return ret;
+
+ rev->major_ver = PROTOCOL_REV_MAJOR(version),
+ rev->minor_ver = PROTOCOL_REV_MINOR(version);
+ ph->set_priv(ph, rev);
+
+ ret = scmi_base_attributes_get(ph);
+ if (ret)
+ return ret;
+
+ prot_imp = devm_kcalloc(dev, rev->num_protocols, sizeof(u8),
+ GFP_KERNEL);
+ if (!prot_imp)
+ return -ENOMEM;
+
+ scmi_base_vendor_id_get(ph, false);
+ scmi_base_vendor_id_get(ph, true);
+ scmi_base_implementation_version_get(ph);
+ scmi_base_implementation_list_get(ph, prot_imp);
+
+ scmi_setup_protocol_implemented(ph, prot_imp);
+
+ dev_info(dev, "SCMI Protocol v%d.%d '%s:%s' Firmware version 0x%x\n",
+ rev->major_ver, rev->minor_ver, rev->vendor_id,
+ rev->sub_vendor_id, rev->impl_ver);
+ dev_dbg(dev, "Found %d protocol(s) %d agent(s)\n", rev->num_protocols,
+ rev->num_agents);
+
+ for (id = 0; id < rev->num_agents; id++) {
+ scmi_base_discover_agent_get(ph, id, name);
+ dev_dbg(dev, "Agent %d: %s\n", id, name);
+ }
+
+ return 0;
+}
+
+static const struct scmi_protocol scmi_base = {
+ .id = SCMI_PROTOCOL_BASE,
+ .owner = NULL,
+ .instance_init = &scmi_base_protocol_init,
+ .ops = NULL,
+ .events = &base_protocol_events,
+};
+
+DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(base, scmi_base)