diff options
Diffstat (limited to 'drivers/st/scmi-msg/smt.c')
| -rw-r--r-- | drivers/st/scmi-msg/smt.c | 206 |
1 files changed, 0 insertions, 206 deletions
diff --git a/drivers/st/scmi-msg/smt.c b/drivers/st/scmi-msg/smt.c deleted file mode 100644 index 2d5cd734f..000000000 --- a/drivers/st/scmi-msg/smt.c +++ /dev/null @@ -1,206 +0,0 @@ -// SPDX-License-Identifier: BSD-3-Clause -/* - * Copyright (c) 2015-2019, Arm Limited and Contributors. All rights reserved. - * Copyright (c) 2019-2020, Linaro Limited - */ -#include <assert.h> -#include <stdbool.h> -#include <stdint.h> -#include <string.h> - -#include <drivers/st/scmi-msg.h> -#include <drivers/st/scmi.h> -#include <lib/cassert.h> -#include <lib/mmio.h> -#include <lib/spinlock.h> -#include <lib/utils.h> -#include <plat/common/platform.h> - -#include "common.h" - -/* Legacy SMT/SCMI messages are 128 bytes at most including SMT header */ -#define SCMI_PLAYLOAD_MAX 92U -#define SCMI_PLAYLOAD_U32_MAX (SCMI_PLAYLOAD_MAX / sizeof(uint32_t)) - -/** - * struct smt_header - SMT formatted header for SMT base shared memory transfer - * - * @status: Bit flags, see SMT_STATUS_* - * @flags: Bit flags, see SMT_FLAG_* - * @length: Byte size of message payload (variable) + ::message_header (32bit) - * payload: SCMI message payload data - */ -struct smt_header { - uint32_t reserved0; - uint32_t status; - uint64_t reserved1; - uint32_t flags; - uint32_t length; /* message_header + payload */ - uint32_t message_header; - uint32_t payload[]; -}; - -CASSERT(SCMI_PLAYLOAD_MAX + sizeof(struct smt_header) <= SMT_BUF_SLOT_SIZE, - assert_scmi_message_max_length_fits_in_smt_buffer_slot); - -/* Flag set in smt_header::status when SMT does not contain pending message */ -#define SMT_STATUS_FREE BIT(0) -/* Flag set in smt_header::status when SMT reports an error */ -#define SMT_STATUS_ERROR BIT(1) - -/* Flag set in smt_header::flags when SMT uses interrupts */ -#define SMT_FLAG_INTR_ENABLED BIT(1) - -/* Bit fields packed in smt_header::message_header */ -#define SMT_MSG_ID_MASK GENMASK_32(7, 0) -#define SMT_HDR_MSG_ID(_hdr) ((_hdr) & SMT_MSG_ID_MASK) - -#define SMT_MSG_TYPE_MASK GENMASK_32(9, 8) -#define SMT_HDR_TYPE_ID(_hdr) (((_hdr) & SMT_MSG_TYPE_MASK) >> 8) - -#define SMT_MSG_PROT_ID_MASK GENMASK_32(17, 10) -#define SMT_HDR_PROT_ID(_hdr) (((_hdr) & SMT_MSG_PROT_ID_MASK) >> 10) - -/* - * Provision input message payload buffers for fastcall SMC context entries - * and for interrupt context execution entries. - */ -static uint32_t fast_smc_payload[PLATFORM_CORE_COUNT][SCMI_PLAYLOAD_U32_MAX]; -static uint32_t interrupt_payload[PLATFORM_CORE_COUNT][SCMI_PLAYLOAD_U32_MAX]; - -/* SMP protection on channel access */ -static struct spinlock smt_channels_lock; - -/* If channel is not busy, set busy and return true, otherwise return false */ -static bool channel_set_busy(struct scmi_msg_channel *chan) -{ - bool channel_is_busy; - - spin_lock(&smt_channels_lock); - - channel_is_busy = chan->busy; - - if (!channel_is_busy) { - chan->busy = true; - } - - spin_unlock(&smt_channels_lock); - - return !channel_is_busy; -} - -static void channel_release_busy(struct scmi_msg_channel *chan) -{ - chan->busy = false; -} - -static struct smt_header *channel_to_smt_hdr(struct scmi_msg_channel *chan) -{ - return (struct smt_header *)chan->shm_addr; -} - -/* - * Creates a SCMI message instance in secure memory and pushes it in the SCMI - * message drivers. Message structure contains SCMI protocol meta-data and - * references to input payload in secure memory and output message buffer - * in shared memory. - */ -static void scmi_proccess_smt(unsigned int agent_id, uint32_t *payload_buf) -{ - struct scmi_msg_channel *chan; - struct smt_header *smt_hdr; - size_t in_payload_size; - uint32_t smt_status; - struct scmi_msg msg; - bool error = true; - - chan = plat_scmi_get_channel(agent_id); - if (chan == NULL) { - return; - } - - smt_hdr = channel_to_smt_hdr(chan); - assert(smt_hdr); - - smt_status = __atomic_load_n(&smt_hdr->status, __ATOMIC_RELAXED); - - if (!channel_set_busy(chan)) { - VERBOSE("SCMI channel %u busy", agent_id); - goto out; - } - - in_payload_size = __atomic_load_n(&smt_hdr->length, __ATOMIC_RELAXED) - - sizeof(smt_hdr->message_header); - - if (in_payload_size > SCMI_PLAYLOAD_MAX) { - VERBOSE("SCMI payload too big %u", in_payload_size); - goto out; - } - - if ((smt_status & (SMT_STATUS_ERROR | SMT_STATUS_FREE)) != 0U) { - VERBOSE("SCMI channel bad status 0x%x", - smt_hdr->status & (SMT_STATUS_ERROR | SMT_STATUS_FREE)); - goto out; - } - - /* Fill message */ - zeromem(&msg, sizeof(msg)); - msg.in = (char *)payload_buf; - msg.in_size = in_payload_size; - msg.out = (char *)smt_hdr->payload; - msg.out_size = chan->shm_size - sizeof(*smt_hdr); - - assert((msg.out != NULL) && (msg.out_size >= sizeof(int32_t))); - - /* Here the payload is copied in secure memory */ - memcpy(msg.in, smt_hdr->payload, in_payload_size); - - msg.protocol_id = SMT_HDR_PROT_ID(smt_hdr->message_header); - msg.message_id = SMT_HDR_MSG_ID(smt_hdr->message_header); - msg.agent_id = agent_id; - - scmi_process_message(&msg); - - /* Update message length with the length of the response message */ - smt_hdr->length = msg.out_size_out + sizeof(smt_hdr->message_header); - - channel_release_busy(chan); - error = false; - -out: - if (error) { - VERBOSE("SCMI error"); - smt_hdr->status |= SMT_STATUS_ERROR | SMT_STATUS_FREE; - } else { - smt_hdr->status |= SMT_STATUS_FREE; - } -} - -void scmi_smt_fastcall_smc_entry(unsigned int agent_id) -{ - scmi_proccess_smt(agent_id, - fast_smc_payload[plat_my_core_pos()]); -} - -void scmi_smt_interrupt_entry(unsigned int agent_id) -{ - scmi_proccess_smt(agent_id, - interrupt_payload[plat_my_core_pos()]); -} - -/* Init a SMT header for a shared memory buffer: state it a free/no-error */ -void scmi_smt_init_agent_channel(struct scmi_msg_channel *chan) -{ - if (chan != NULL) { - struct smt_header *smt_header = channel_to_smt_hdr(chan); - - if (smt_header != NULL) { - memset(smt_header, 0, sizeof(*smt_header)); - smt_header->status = SMT_STATUS_FREE; - - return; - } - } - - panic(); -} |