From 102b0d2daa97dae68d3eed54d8fe37a9cc38a892 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 28 Apr 2024 11:13:47 +0200 Subject: Adding upstream version 2.8.0+dfsg. Signed-off-by: Daniel Baumann --- plat/brcm/common/brcm_scpi.c | 252 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 252 insertions(+) create mode 100644 plat/brcm/common/brcm_scpi.c (limited to 'plat/brcm/common/brcm_scpi.c') diff --git a/plat/brcm/common/brcm_scpi.c b/plat/brcm/common/brcm_scpi.c new file mode 100644 index 0000000..0a703cb --- /dev/null +++ b/plat/brcm/common/brcm_scpi.c @@ -0,0 +1,252 @@ +/* + * Copyright (c) 2019-2020, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include +#include + +#include +#include +#include +#include + +#include +#include +#include + +#define SCPI_SHARED_MEM_SCP_TO_AP (PLAT_SCP_COM_SHARED_MEM_BASE) +#define SCPI_SHARED_MEM_AP_TO_SCP (PLAT_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 + +static void scpi_secure_message_start(void) +{ + mhu_secure_message_start(SCPI_MHU_SLOT_ID); +} + +static void scpi_secure_message_send(size_t payload_size) +{ + /* + * Ensure that any write to the SCPI payload area is seen by SCP before + * we write to the MHU register. If these 2 writes were reordered by + * the CPU then SCP would read stale payload data + */ + dmbst(); + + mhu_secure_message_send(SCPI_MHU_SLOT_ID); +} + +static void scpi_secure_message_receive(scpi_cmd_t *cmd) +{ + uint32_t mhu_status; + + assert(cmd != NULL); + + mhu_status = mhu_secure_message_wait(); + + /* Expect an SCPI message, reject any other protocol */ + if (mhu_status != (1 << SCPI_MHU_SLOT_ID)) { + ERROR("MHU: Unexpected protocol (MHU status: 0x%x)\n", + mhu_status); + panic(); + } + + /* + * Ensure that any read to the SCPI payload area is done after reading + * the MHU register. If these 2 reads were reordered then the CPU would + * read invalid payload data + */ + dmbld(); + + memcpy(cmd, (void *) SCPI_SHARED_MEM_SCP_TO_AP, sizeof(*cmd)); +} + +static void scpi_secure_message_end(void) +{ + mhu_secure_message_end(SCPI_MHU_SLOT_ID); +} + +int scpi_wait_ready(void) +{ + scpi_cmd_t scpi_cmd; + + VERBOSE("Waiting for SCP_READY command...\n"); + + /* Get a message from the SCP */ + scpi_secure_message_start(); + scpi_secure_message_receive(&scpi_cmd); + scpi_secure_message_end(); + + /* We are expecting 'SCP Ready', produce correct error if it's not */ + scpi_status_t status = SCP_OK; + + if (scpi_cmd.id != SCPI_CMD_SCP_READY) { + ERROR("Unexpected SCP command: expected #%u, received #%u\n", + SCPI_CMD_SCP_READY, scpi_cmd.id); + status = SCP_E_SUPPORT; + } else if (scpi_cmd.size != 0) { + ERROR("SCP_READY cmd has incorrect size: expected 0, got %u\n", + scpi_cmd.size); + status = SCP_E_SIZE; + } + + VERBOSE("Sending response for SCP_READY command\n"); + + /* + * Send our response back to SCP. + * We are using the same SCPI header, just update the status field. + */ + scpi_cmd.status = status; + scpi_secure_message_start(); + memcpy((void *) SCPI_SHARED_MEM_AP_TO_SCP, &scpi_cmd, sizeof(scpi_cmd)); + scpi_secure_message_send(0); + scpi_secure_message_end(); + + return status == SCP_OK ? 0 : -1; +} + +void scpi_set_brcm_power_state(unsigned int mpidr, + scpi_power_state_t cpu_state, scpi_power_state_t cluster_state, + scpi_power_state_t brcm_state) +{ + scpi_cmd_t *cmd; + uint32_t state = 0; + uint32_t *payload_addr; + +#if ARM_PLAT_MT + /* + * The current SCPI driver only caters for single-threaded platforms. + * Hence we ignore the thread ID (which is always 0) for such platforms. + */ + state |= (mpidr >> MPIDR_AFF1_SHIFT) & 0x0f; /* CPU ID */ + state |= ((mpidr >> MPIDR_AFF2_SHIFT) & 0x0f) << 4; /* Cluster ID */ +#else + state |= mpidr & 0x0f; /* CPU ID */ + state |= (mpidr & 0xf00) >> 4; /* Cluster ID */ +#endif /* ARM_PLAT_MT */ + + state |= cpu_state << 8; + state |= cluster_state << 12; + state |= brcm_state << 16; + + scpi_secure_message_start(); + + /* Populate the command header */ + cmd = SCPI_CMD_HEADER_AP_TO_SCP; + cmd->id = SCPI_CMD_SET_POWER_STATE; + cmd->set = SCPI_SET_NORMAL; + cmd->sender = 0; + cmd->size = sizeof(state); + /* Populate the command payload */ + payload_addr = SCPI_CMD_PAYLOAD_AP_TO_SCP; + *payload_addr = state; + scpi_secure_message_send(sizeof(state)); + + /* + * SCP does not reply to this command in order to avoid MHU interrupts + * from the sender, which could interfere with its power state request. + */ + scpi_secure_message_end(); +} + +/* + * Query and obtain 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_brcm_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 */ + zeromem(SCPI_CMD_HEADER_AP_TO_SCP, sizeof(*cmd)); + cmd = SCPI_CMD_HEADER_AP_TO_SCP; + cmd->id = SCPI_CMD_GET_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; + uint8_t *payload_addr; + + scpi_secure_message_start(); + + /* Populate the command header */ + cmd = SCPI_CMD_HEADER_AP_TO_SCP; + cmd->id = SCPI_CMD_SYS_POWER_STATE; + cmd->set = 0; + cmd->sender = 0; + cmd->size = sizeof(*payload_addr); + /* Populate the command payload */ + payload_addr = SCPI_CMD_PAYLOAD_AP_TO_SCP; + *payload_addr = system_state & 0xff; + scpi_secure_message_send(sizeof(*payload_addr)); + + scpi_secure_message_end(); + + return SCP_OK; +} -- cgit v1.2.3