summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--drivers/firmware/arm_scmi/Makefile2
-rw-r--r--drivers/firmware/arm_scmi/power.c221
-rw-r--r--include/linux/scmi_protocol.h28
3 files changed, 250 insertions, 1 deletions
diff --git a/drivers/firmware/arm_scmi/Makefile b/drivers/firmware/arm_scmi/Makefile
index 2130ee9ac825..420c761ced94 100644
--- a/drivers/firmware/arm_scmi/Makefile
+++ b/drivers/firmware/arm_scmi/Makefile
@@ -1,4 +1,4 @@
obj-y = scmi-bus.o scmi-driver.o scmi-protocols.o
scmi-bus-y = bus.o
scmi-driver-y = driver.o
-scmi-protocols-y = base.o clock.o perf.o
+scmi-protocols-y = base.o clock.o perf.o power.o
diff --git a/drivers/firmware/arm_scmi/power.c b/drivers/firmware/arm_scmi/power.c
new file mode 100644
index 000000000000..087c2876cdf2
--- /dev/null
+++ b/drivers/firmware/arm_scmi/power.c
@@ -0,0 +1,221 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * System Control and Management Interface (SCMI) Power Protocol
+ *
+ * Copyright (C) 2018 ARM Ltd.
+ */
+
+#include "common.h"
+
+enum scmi_power_protocol_cmd {
+ POWER_DOMAIN_ATTRIBUTES = 0x3,
+ POWER_STATE_SET = 0x4,
+ POWER_STATE_GET = 0x5,
+ POWER_STATE_NOTIFY = 0x6,
+};
+
+struct scmi_msg_resp_power_attributes {
+ __le16 num_domains;
+ __le16 reserved;
+ __le32 stats_addr_low;
+ __le32 stats_addr_high;
+ __le32 stats_size;
+};
+
+struct scmi_msg_resp_power_domain_attributes {
+ __le32 flags;
+#define SUPPORTS_STATE_SET_NOTIFY(x) ((x) & BIT(31))
+#define SUPPORTS_STATE_SET_ASYNC(x) ((x) & BIT(30))
+#define SUPPORTS_STATE_SET_SYNC(x) ((x) & BIT(29))
+ u8 name[SCMI_MAX_STR_SIZE];
+};
+
+struct scmi_power_set_state {
+ __le32 flags;
+#define STATE_SET_ASYNC BIT(0)
+ __le32 domain;
+ __le32 state;
+};
+
+struct scmi_power_state_notify {
+ __le32 domain;
+ __le32 notify_enable;
+};
+
+struct power_dom_info {
+ bool state_set_sync;
+ bool state_set_async;
+ bool state_set_notify;
+ char name[SCMI_MAX_STR_SIZE];
+};
+
+struct scmi_power_info {
+ int num_domains;
+ u64 stats_addr;
+ u32 stats_size;
+ struct power_dom_info *dom_info;
+};
+
+static int scmi_power_attributes_get(const struct scmi_handle *handle,
+ struct scmi_power_info *pi)
+{
+ int ret;
+ struct scmi_xfer *t;
+ struct scmi_msg_resp_power_attributes *attr;
+
+ ret = scmi_one_xfer_init(handle, PROTOCOL_ATTRIBUTES,
+ SCMI_PROTOCOL_POWER, 0, sizeof(*attr), &t);
+ if (ret)
+ return ret;
+
+ attr = t->rx.buf;
+
+ ret = scmi_do_xfer(handle, t);
+ if (!ret) {
+ pi->num_domains = le16_to_cpu(attr->num_domains);
+ pi->stats_addr = le32_to_cpu(attr->stats_addr_low) |
+ (u64)le32_to_cpu(attr->stats_addr_high) << 32;
+ pi->stats_size = le32_to_cpu(attr->stats_size);
+ }
+
+ scmi_one_xfer_put(handle, t);
+ return ret;
+}
+
+static int
+scmi_power_domain_attributes_get(const struct scmi_handle *handle, u32 domain,
+ struct power_dom_info *dom_info)
+{
+ int ret;
+ struct scmi_xfer *t;
+ struct scmi_msg_resp_power_domain_attributes *attr;
+
+ ret = scmi_one_xfer_init(handle, POWER_DOMAIN_ATTRIBUTES,
+ SCMI_PROTOCOL_POWER, sizeof(domain),
+ sizeof(*attr), &t);
+ if (ret)
+ return ret;
+
+ *(__le32 *)t->tx.buf = cpu_to_le32(domain);
+ attr = t->rx.buf;
+
+ ret = scmi_do_xfer(handle, t);
+ if (!ret) {
+ u32 flags = le32_to_cpu(attr->flags);
+
+ dom_info->state_set_notify = SUPPORTS_STATE_SET_NOTIFY(flags);
+ dom_info->state_set_async = SUPPORTS_STATE_SET_ASYNC(flags);
+ dom_info->state_set_sync = SUPPORTS_STATE_SET_SYNC(flags);
+ memcpy(dom_info->name, attr->name, SCMI_MAX_STR_SIZE);
+ }
+
+ scmi_one_xfer_put(handle, t);
+ return ret;
+}
+
+static int
+scmi_power_state_set(const struct scmi_handle *handle, u32 domain, u32 state)
+{
+ int ret;
+ struct scmi_xfer *t;
+ struct scmi_power_set_state *st;
+
+ ret = scmi_one_xfer_init(handle, POWER_STATE_SET, SCMI_PROTOCOL_POWER,
+ sizeof(*st), 0, &t);
+ if (ret)
+ return ret;
+
+ st = t->tx.buf;
+ st->flags = cpu_to_le32(0);
+ st->domain = cpu_to_le32(domain);
+ st->state = cpu_to_le32(state);
+
+ ret = scmi_do_xfer(handle, t);
+
+ scmi_one_xfer_put(handle, t);
+ return ret;
+}
+
+static int
+scmi_power_state_get(const struct scmi_handle *handle, u32 domain, u32 *state)
+{
+ int ret;
+ struct scmi_xfer *t;
+
+ ret = scmi_one_xfer_init(handle, POWER_STATE_GET, SCMI_PROTOCOL_POWER,
+ sizeof(u32), sizeof(u32), &t);
+ if (ret)
+ return ret;
+
+ *(__le32 *)t->tx.buf = cpu_to_le32(domain);
+
+ ret = scmi_do_xfer(handle, t);
+ if (!ret)
+ *state = le32_to_cpu(*(__le32 *)t->rx.buf);
+
+ scmi_one_xfer_put(handle, t);
+ return ret;
+}
+
+static int scmi_power_num_domains_get(const struct scmi_handle *handle)
+{
+ struct scmi_power_info *pi = handle->power_priv;
+
+ return pi->num_domains;
+}
+
+static char *scmi_power_name_get(const struct scmi_handle *handle, u32 domain)
+{
+ struct scmi_power_info *pi = handle->power_priv;
+ struct power_dom_info *dom = pi->dom_info + domain;
+
+ return dom->name;
+}
+
+static struct scmi_power_ops power_ops = {
+ .num_domains_get = scmi_power_num_domains_get,
+ .name_get = scmi_power_name_get,
+ .state_set = scmi_power_state_set,
+ .state_get = scmi_power_state_get,
+};
+
+static int scmi_power_protocol_init(struct scmi_handle *handle)
+{
+ int domain;
+ u32 version;
+ struct scmi_power_info *pinfo;
+
+ scmi_version_get(handle, SCMI_PROTOCOL_POWER, &version);
+
+ dev_dbg(handle->dev, "Power Version %d.%d\n",
+ PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
+
+ pinfo = devm_kzalloc(handle->dev, sizeof(*pinfo), GFP_KERNEL);
+ if (!pinfo)
+ return -ENOMEM;
+
+ scmi_power_attributes_get(handle, pinfo);
+
+ pinfo->dom_info = devm_kcalloc(handle->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 power_dom_info *dom = pinfo->dom_info + domain;
+
+ scmi_power_domain_attributes_get(handle, domain, dom);
+ }
+
+ handle->power_ops = &power_ops;
+ handle->power_priv = pinfo;
+
+ return 0;
+}
+
+static int __init scmi_power_init(void)
+{
+ return scmi_protocol_register(SCMI_PROTOCOL_POWER,
+ &scmi_power_protocol_init);
+}
+subsys_initcall(scmi_power_init);
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index 5a3092f05011..8cd0348787bc 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -113,10 +113,36 @@ struct scmi_perf_ops {
};
/**
+ * struct scmi_power_ops - represents the various operations provided
+ * by SCMI Power Protocol
+ *
+ * @num_domains_get: get the count of power domains provided by SCMI
+ * @name_get: gets the name of a power domain
+ * @state_set: sets the power state of a power domain
+ * @state_get: gets the power state of a power domain
+ */
+struct scmi_power_ops {
+ int (*num_domains_get)(const struct scmi_handle *handle);
+ char *(*name_get)(const struct scmi_handle *handle, u32 domain);
+#define SCMI_POWER_STATE_TYPE_SHIFT 30
+#define SCMI_POWER_STATE_ID_MASK (BIT(28) - 1)
+#define SCMI_POWER_STATE_PARAM(type, id) \
+ ((((type) & BIT(0)) << SCMI_POWER_STATE_TYPE_SHIFT) | \
+ ((id) & SCMI_POWER_STATE_ID_MASK))
+#define SCMI_POWER_STATE_GENERIC_ON SCMI_POWER_STATE_PARAM(0, 0)
+#define SCMI_POWER_STATE_GENERIC_OFF SCMI_POWER_STATE_PARAM(1, 0)
+ int (*state_set)(const struct scmi_handle *handle, u32 domain,
+ u32 state);
+ int (*state_get)(const struct scmi_handle *handle, u32 domain,
+ u32 *state);
+};
+
+/**
* struct scmi_handle - Handle returned to ARM SCMI clients for usage.
*
* @dev: pointer to the SCMI device
* @version: pointer to the structure containing SCMI version information
+ * @power_ops: pointer to set of power protocol operations
* @perf_ops: pointer to set of performance protocol operations
* @clk_ops: pointer to set of clock protocol operations
*/
@@ -125,9 +151,11 @@ struct scmi_handle {
struct scmi_revision_info *version;
struct scmi_perf_ops *perf_ops;
struct scmi_clk_ops *clk_ops;
+ struct scmi_power_ops *power_ops;
/* for protocol internal use */
void *perf_priv;
void *clk_priv;
+ void *power_priv;
};
enum scmi_std_protocol {
generated by cgit v1.2.3 (git 2.39.1) at 2024-08-02 15:45:11 +0000