1 // SPDX-License-Identifier: GPL-2.0
3  * For transport using shared mem structure.
38 	 * until it releases the shared memory, otherwise we may endup  in shmem_tx_prepare()
39 	 * overwriting its response with new message payload or vice-versa  in shmem_tx_prepare()
41 	spin_until_cond(ioread32(&shmem->channel_status) &  in shmem_tx_prepare()
44 	iowrite32(0x0, &shmem->channel_status);  in shmem_tx_prepare()
45 	iowrite32(xfer->hdr.poll_completion ? 0 : SCMI_SHMEM_FLAG_INTR_ENABLED,  in shmem_tx_prepare()
46 		  &shmem->flags);  in shmem_tx_prepare()
47 	iowrite32(sizeof(shmem->msg_header) + xfer->tx.len, &shmem->length);  in shmem_tx_prepare()
48 	iowrite32(pack_scmi_header(&xfer->hdr), &shmem->msg_header);  in shmem_tx_prepare()
49 	if (xfer->tx.buf)  in shmem_tx_prepare()
50 		memcpy_toio(shmem->msg_payload, xfer->tx.buf, xfer->tx.len);  in shmem_tx_prepare()
55 	return ioread32(&shmem->msg_header);  in shmem_read_header()
61 	size_t len = ioread32(&shmem->length);  in shmem_fetch_response()
63 	xfer->hdr.status = ioread32(shmem->msg_payload);  in shmem_fetch_response()
65 	xfer->rx.len = min_t(size_t, xfer->rx.len, len > 8 ? len - 8 : 0);  in shmem_fetch_response()
67 	/* Take a copy to the rx buffer.. */  in shmem_fetch_response()
68 	memcpy_fromio(xfer->rx.buf, shmem->msg_payload + 4, xfer->rx.len);  in shmem_fetch_response()
74 	size_t len = ioread32(&shmem->length);  in shmem_fetch_notification()
77 	xfer->rx.len = min_t(size_t, max_len, len > 4 ? len - 4 : 0);  in shmem_fetch_notification()
79 	/* Take a copy to the rx buffer.. */  in shmem_fetch_notification()
80 	memcpy_fromio(xfer->rx.buf, shmem->msg_payload, xfer->rx.len);  in shmem_fetch_notification()
85 	iowrite32(SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE, &shmem->channel_status);  in shmem_clear_channel()
93 	xfer_id = MSG_XTRACT_TOKEN(ioread32(&shmem->msg_header));  in shmem_poll_done()
95 	if (xfer->hdr.seq != xfer_id)  in shmem_poll_done()
98 	return ioread32(&shmem->channel_status) &  in shmem_poll_done()
105 	return (ioread32(&shmem->channel_status) &  in shmem_channel_free()