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