1*91f16700Schasinglulu /* 2*91f16700Schasinglulu * Copyright (c) 2019, ARM Limited and Contributors. All rights reserved. 3*91f16700Schasinglulu * 4*91f16700Schasinglulu * SPDX-License-Identifier: BSD-3-Clause 5*91f16700Schasinglulu */ 6*91f16700Schasinglulu 7*91f16700Schasinglulu #include <assert.h> 8*91f16700Schasinglulu 9*91f16700Schasinglulu #include <arch_helpers.h> 10*91f16700Schasinglulu #include <common/debug.h> 11*91f16700Schasinglulu #include <drivers/arm/css/scmi.h> 12*91f16700Schasinglulu 13*91f16700Schasinglulu #include "scmi_private.h" 14*91f16700Schasinglulu #include "scmi_sq.h" 15*91f16700Schasinglulu 16*91f16700Schasinglulu #include <sq_common.h> 17*91f16700Schasinglulu 18*91f16700Schasinglulu /* SCMI message ID to get the available DRAM region */ 19*91f16700Schasinglulu #define SCMI_VENDOR_EXT_MEMINFO_GET_MSG 0x3 20*91f16700Schasinglulu 21*91f16700Schasinglulu #define SCMI_VENDOR_EXT_MEMINFO_GET_MSG_LEN 4 22*91f16700Schasinglulu 23*91f16700Schasinglulu /* 24*91f16700Schasinglulu * API to get the available DRAM region 25*91f16700Schasinglulu */ 26*91f16700Schasinglulu int scmi_get_draminfo(void *p, struct draminfo *info) 27*91f16700Schasinglulu { 28*91f16700Schasinglulu mailbox_mem_t *mbx_mem; 29*91f16700Schasinglulu int token = 0, ret; 30*91f16700Schasinglulu scmi_channel_t *ch = (scmi_channel_t *)p; 31*91f16700Schasinglulu struct dram_info_resp response; 32*91f16700Schasinglulu 33*91f16700Schasinglulu validate_scmi_channel(ch); 34*91f16700Schasinglulu 35*91f16700Schasinglulu scmi_get_channel(ch); 36*91f16700Schasinglulu 37*91f16700Schasinglulu mbx_mem = (mailbox_mem_t *)(ch->info->scmi_mbx_mem); 38*91f16700Schasinglulu mbx_mem->msg_header = SCMI_MSG_CREATE(SCMI_SYS_VENDOR_EXT_PROTO_ID, 39*91f16700Schasinglulu SCMI_VENDOR_EXT_MEMINFO_GET_MSG, token); 40*91f16700Schasinglulu mbx_mem->len = SCMI_VENDOR_EXT_MEMINFO_GET_MSG_LEN; 41*91f16700Schasinglulu mbx_mem->flags = SCMI_FLAG_RESP_POLL; 42*91f16700Schasinglulu 43*91f16700Schasinglulu scmi_send_sync_command(ch); 44*91f16700Schasinglulu 45*91f16700Schasinglulu /* 46*91f16700Schasinglulu * Ensure that any read to the SCPI payload area is done after reading 47*91f16700Schasinglulu * the MHU register. If these 2 reads were reordered then the CPU would 48*91f16700Schasinglulu * read invalid payload data 49*91f16700Schasinglulu */ 50*91f16700Schasinglulu dmbld(); 51*91f16700Schasinglulu 52*91f16700Schasinglulu /* Get the return values */ 53*91f16700Schasinglulu SCMI_PAYLOAD_RET_VAL1(mbx_mem->payload, ret); 54*91f16700Schasinglulu 55*91f16700Schasinglulu memcpy(&response, (void *)mbx_mem->payload, sizeof(response)); 56*91f16700Schasinglulu 57*91f16700Schasinglulu scmi_put_channel(ch); 58*91f16700Schasinglulu 59*91f16700Schasinglulu *info = response.info; 60*91f16700Schasinglulu 61*91f16700Schasinglulu return ret; 62*91f16700Schasinglulu } 63