SCPI: Add function to query CSS power state
This patch adds the function scpi_get_css_power_state to perform the
'Get CSS Power State' SCP command and handle its response. The function
parses SCP response to obtain power states of requested cluster and CPUs
within.
Change-Id: I3ea26e48dff1a139da73f6c1e0893f21accaf9f0
diff --git a/plat/arm/css/common/css_scpi.c b/plat/arm/css/common/css_scpi.c
index 02d573c..90a8939 100644
--- a/plat/arm/css/common/css_scpi.c
+++ b/plat/arm/css/common/css_scpi.c
@@ -41,11 +41,18 @@
#define SCPI_SHARED_MEM_AP_TO_SCP (PLAT_CSS_SCP_COM_SHARED_MEM_BASE \
+ 0x100)
+/* Header and payload addresses for commands from AP to SCP */
#define SCPI_CMD_HEADER_AP_TO_SCP \
((scpi_cmd_t *) SCPI_SHARED_MEM_AP_TO_SCP)
#define SCPI_CMD_PAYLOAD_AP_TO_SCP \
((void *) (SCPI_SHARED_MEM_AP_TO_SCP + sizeof(scpi_cmd_t)))
+/* Header and payload addresses for responses from SCP to AP */
+#define SCPI_RES_HEADER_SCP_TO_AP \
+ ((scpi_cmd_t *) SCPI_SHARED_MEM_SCP_TO_AP)
+#define SCPI_RES_PAYLOAD_SCP_TO_AP \
+ ((void *) (SCPI_SHARED_MEM_SCP_TO_AP + sizeof(scpi_cmd_t)))
+
/* ID of the MHU slot used for the SCPI protocol */
#define SCPI_MHU_SLOT_ID 0
@@ -163,6 +170,68 @@
scpi_secure_message_end();
}
+/*
+ * Query and obtain CSS power state from SCP.
+ *
+ * In response to the query, SCP returns power states of all CPUs in all
+ * clusters of the system. The returned response is then filtered based on the
+ * supplied MPIDR. Power states of requested cluster and CPUs within are updated
+ * via. supplied non-NULL pointer arguments.
+ *
+ * Returns 0 on success, or -1 on errors.
+ */
+int scpi_get_css_power_state(unsigned int mpidr, unsigned int *cpu_state_p,
+ unsigned int *cluster_state_p)
+{
+ scpi_cmd_t *cmd;
+ scpi_cmd_t response;
+ int power_state, cpu, cluster, rc = -1;
+
+ /*
+ * Extract CPU and cluster membership of the given MPIDR. SCPI caters
+ * for only up to 0xf clusters, and 8 CPUs per cluster
+ */
+ cpu = mpidr & MPIDR_AFFLVL_MASK;
+ cluster = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK;
+ if (cpu >= 8 || cluster >= 0xf)
+ return -1;
+
+ scpi_secure_message_start();
+
+ /* Populate request headers */
+ cmd = memset(SCPI_CMD_HEADER_AP_TO_SCP, 0, sizeof(*cmd));
+ cmd->id = SCPI_CMD_GET_CSS_POWER_STATE;
+
+ /*
+ * Send message and wait for SCP's response
+ */
+ scpi_secure_message_send(0);
+ scpi_secure_message_receive(&response);
+
+ if (response.status != SCP_OK)
+ goto exit;
+
+ /* Validate SCP response */
+ if (!CHECK_RESPONSE(response, cluster))
+ goto exit;
+
+ /* Extract power states for required cluster */
+ power_state = *(((uint16_t *) SCPI_RES_PAYLOAD_SCP_TO_AP) + cluster);
+ if (CLUSTER_ID(power_state) != cluster)
+ goto exit;
+
+ /* Update power state via. pointers */
+ if (cluster_state_p)
+ *cluster_state_p = CLUSTER_POWER_STATE(power_state);
+ if (cpu_state_p)
+ *cpu_state_p = CPU_POWER_STATE(power_state);
+ rc = 0;
+
+exit:
+ scpi_secure_message_end();
+ return rc;
+}
+
uint32_t scpi_sys_power_state(scpi_system_state_t system_state)
{
scpi_cmd_t *cmd;