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
This commit is contained in:
Jeenu Viswambharan
parent
1298ae0234
commit
05b128f25e
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@ -41,11 +41,18 @@
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#define SCPI_SHARED_MEM_AP_TO_SCP (PLAT_CSS_SCP_COM_SHARED_MEM_BASE \
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+ 0x100)
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/* Header and payload addresses for commands from AP to SCP */
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#define SCPI_CMD_HEADER_AP_TO_SCP \
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((scpi_cmd_t *) SCPI_SHARED_MEM_AP_TO_SCP)
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#define SCPI_CMD_PAYLOAD_AP_TO_SCP \
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((void *) (SCPI_SHARED_MEM_AP_TO_SCP + sizeof(scpi_cmd_t)))
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/* Header and payload addresses for responses from SCP to AP */
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#define SCPI_RES_HEADER_SCP_TO_AP \
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((scpi_cmd_t *) SCPI_SHARED_MEM_SCP_TO_AP)
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#define SCPI_RES_PAYLOAD_SCP_TO_AP \
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((void *) (SCPI_SHARED_MEM_SCP_TO_AP + sizeof(scpi_cmd_t)))
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/* ID of the MHU slot used for the SCPI protocol */
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#define SCPI_MHU_SLOT_ID 0
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@ -163,6 +170,68 @@ void scpi_set_css_power_state(unsigned mpidr, scpi_power_state_t cpu_state,
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scpi_secure_message_end();
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}
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/*
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* Query and obtain CSS power state from SCP.
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*
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* In response to the query, SCP returns power states of all CPUs in all
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* clusters of the system. The returned response is then filtered based on the
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* supplied MPIDR. Power states of requested cluster and CPUs within are updated
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* via. supplied non-NULL pointer arguments.
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*
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* Returns 0 on success, or -1 on errors.
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*/
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int scpi_get_css_power_state(unsigned int mpidr, unsigned int *cpu_state_p,
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unsigned int *cluster_state_p)
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{
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scpi_cmd_t *cmd;
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scpi_cmd_t response;
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int power_state, cpu, cluster, rc = -1;
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/*
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* Extract CPU and cluster membership of the given MPIDR. SCPI caters
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* for only up to 0xf clusters, and 8 CPUs per cluster
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*/
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cpu = mpidr & MPIDR_AFFLVL_MASK;
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cluster = (mpidr >> MPIDR_AFF1_SHIFT) & MPIDR_AFFLVL_MASK;
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if (cpu >= 8 || cluster >= 0xf)
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return -1;
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scpi_secure_message_start();
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/* Populate request headers */
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cmd = memset(SCPI_CMD_HEADER_AP_TO_SCP, 0, sizeof(*cmd));
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cmd->id = SCPI_CMD_GET_CSS_POWER_STATE;
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/*
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* Send message and wait for SCP's response
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*/
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scpi_secure_message_send(0);
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scpi_secure_message_receive(&response);
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if (response.status != SCP_OK)
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goto exit;
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/* Validate SCP response */
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if (!CHECK_RESPONSE(response, cluster))
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goto exit;
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/* Extract power states for required cluster */
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power_state = *(((uint16_t *) SCPI_RES_PAYLOAD_SCP_TO_AP) + cluster);
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if (CLUSTER_ID(power_state) != cluster)
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goto exit;
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/* Update power state via. pointers */
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if (cluster_state_p)
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*cluster_state_p = CLUSTER_POWER_STATE(power_state);
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if (cpu_state_p)
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*cpu_state_p = CPU_POWER_STATE(power_state);
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rc = 0;
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exit:
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scpi_secure_message_end();
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return rc;
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}
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uint32_t scpi_sys_power_state(scpi_system_state_t system_state)
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{
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scpi_cmd_t *cmd;
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@ -1,5 +1,5 @@
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/*
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* Copyright (c) 2014-2015, ARM Limited and Contributors. All rights reserved.
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* Copyright (c) 2014-2016, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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@ -81,9 +81,34 @@ typedef uint32_t scpi_status_t;
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typedef enum {
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SCPI_CMD_SCP_READY = 0x01,
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SCPI_CMD_SET_CSS_POWER_STATE = 0x03,
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SCPI_CMD_GET_CSS_POWER_STATE = 0x04,
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SCPI_CMD_SYS_POWER_STATE = 0x05
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} scpi_command_t;
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/*
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* Macros to parse SCP response to GET_CSS_POWER_STATE command
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*
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* [3:0] : cluster ID
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* [7:4] : cluster state: 0 = on; 3 = off; rest are reserved
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* [15:8]: on/off state for individual CPUs in the cluster
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*
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* Payload is in little-endian
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*/
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#define CLUSTER_ID(_resp) ((_resp) & 0xf)
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#define CLUSTER_POWER_STATE(_resp) (((_resp) >> 4) & 0xf)
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/* Result is a bit mask of CPU on/off states in the cluster */
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#define CPU_POWER_STATE(_resp) (((_resp) >> 8) & 0xff)
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/*
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* For GET_CSS_POWER_STATE, SCP returns the power states of every cluster. The
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* size of response depends on the number of clusters in the system. The
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* SCP-to-AP payload contains 2 bytes per cluster. Make sure the response is
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* large enough to contain power states of a given cluster
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*/
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#define CHECK_RESPONSE(_resp, _clus) \
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(_resp.size >= (((_clus) + 1) * 2))
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typedef enum {
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scpi_power_on = 0,
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scpi_power_retention = 1,
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@ -101,6 +126,8 @@ extern void scpi_set_css_power_state(unsigned mpidr,
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scpi_power_state_t cpu_state,
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scpi_power_state_t cluster_state,
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scpi_power_state_t css_state);
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int scpi_get_css_power_state(unsigned int mpidr, unsigned int *cpu_state_p,
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unsigned int *cluster_state_p);
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uint32_t scpi_sys_power_state(scpi_system_state_t system_state);
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