SST_IPCD
ctx->ipc_reg.ipcd = SST_IPCD + ctx->pdata->ipc_info->ipc_offset;
clear_ipc.full = sst_shim_read64(sst_drv_ctx->shim, SST_IPCD);
sst_shim_write64(sst_drv_ctx->shim, SST_IPCD, clear_ipc.full);