diff options
Diffstat (limited to 'plat/socionext/synquacer/drivers/scpi/sq_scpi.c')
| -rw-r--r-- | plat/socionext/synquacer/drivers/scpi/sq_scpi.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/plat/socionext/synquacer/drivers/scpi/sq_scpi.c b/plat/socionext/synquacer/drivers/scpi/sq_scpi.c new file mode 100644 index 0000000..0cb75a0 --- /dev/null +++ b/plat/socionext/synquacer/drivers/scpi/sq_scpi.c @@ -0,0 +1,219 @@ +/* + * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <assert.h> +#include <string.h> + +#include <platform_def.h> + +#include <arch_helpers.h> +#include <common/debug.h> +#include <sq_common.h> + +#include "sq_mhu.h" +#include "sq_scpi.h" + +#define SCPI_SHARED_MEM_SCP_TO_AP PLAT_SQ_SCP_COM_SHARED_MEM_BASE +#define SCPI_SHARED_MEM_AP_TO_SCP (PLAT_SQ_SCP_COM_SHARED_MEM_BASE \ + + 0x100) + +#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))) + +/* 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; + scpi_status_t status = SCP_OK; + + 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 */ + if (scpi_cmd.id != SCPI_CMD_SCP_READY) { + ERROR("Unexpected SCP command: expected command #%u," + "got command #%u\n", SCPI_CMD_SCP_READY, scpi_cmd.id); + status = SCP_E_SUPPORT; + } else if (scpi_cmd.size != 0) { + ERROR("SCP_READY command 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_sq_power_state(unsigned int mpidr, scpi_power_state_t cpu_state, + scpi_power_state_t cluster_state, scpi_power_state_t sq_state) +{ + scpi_cmd_t *cmd; + uint32_t state = 0; + uint32_t *payload_addr; + + state |= mpidr & 0x0f; /* CPU ID */ + state |= (mpidr & 0xf00) >> 4; /* Cluster ID */ + state |= cpu_state << 8; + state |= cluster_state << 12; + state |= sq_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(); +} + +uint32_t scpi_sys_power_state(scpi_system_state_t system_state) +{ + scpi_cmd_t *cmd; + uint8_t *payload_addr; + scpi_cmd_t response; + + 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_receive(&response); + + scpi_secure_message_end(); + + return response.status; +} + +uint32_t scpi_get_draminfo(struct draminfo *info) +{ + scpi_cmd_t *cmd; + struct { + scpi_cmd_t cmd; + struct draminfo info; + } response; + uint32_t mhu_status; + + scpi_secure_message_start(); + + /* Populate the command header */ + cmd = SCPI_CMD_HEADER_AP_TO_SCP; + cmd->id = SCPI_CMD_GET_DRAMINFO; + cmd->set = SCPI_SET_EXTENDED; + cmd->sender = 0; + cmd->size = 0; + + scpi_secure_message_send(0); + + 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(&response, (void *)SCPI_SHARED_MEM_SCP_TO_AP, sizeof(response)); + + scpi_secure_message_end(); + + if (response.cmd.status == SCP_OK) + *info = response.info; + + return response.cmd.status; +} |