1 // SPDX-License-Identifier: GPL-2.0
13 #include <asm-generic/bug.h>
18  * SCMI specification requires all parameters, message headers, return
35 void shmem_tx_prepare(struct scmi_shared_mem __iomem *shmem,  in shmem_tx_prepare()  argument
44 	 * overwriting its response with new message payload or vice-versa.  in shmem_tx_prepare()
46 	 * not to bail-out on intermittent issues where the platform is  in shmem_tx_prepare()
49 	 * Note that after a timeout is detected we bail-out and carry on but  in shmem_tx_prepare()
52 	 * due to a misbehaving SCMI firmware.  in shmem_tx_prepare()
54 	stop = ktime_add_ms(ktime_get(), 2 * cinfo->rx_timeout_ms);  in shmem_tx_prepare()
55 	spin_until_cond((ioread32(&shmem->channel_status) &  in shmem_tx_prepare()
58 	if (!(ioread32(&shmem->channel_status) &  in shmem_tx_prepare()
61 		dev_err(cinfo->dev,  in shmem_tx_prepare()
67 	iowrite32(0x0, &shmem->channel_status);  in shmem_tx_prepare()
68 	iowrite32(xfer->hdr.poll_completion ? 0 : SCMI_SHMEM_FLAG_INTR_ENABLED,  in shmem_tx_prepare()
69 		  &shmem->flags);  in shmem_tx_prepare()
70 	iowrite32(sizeof(shmem->msg_header) + xfer->tx.len, &shmem->length);  in shmem_tx_prepare()
71 	iowrite32(pack_scmi_header(&xfer->hdr), &shmem->msg_header);  in shmem_tx_prepare()
72 	if (xfer->tx.buf)  in shmem_tx_prepare()
73 		memcpy_toio(shmem->msg_payload, xfer->tx.buf, xfer->tx.len);  in shmem_tx_prepare()
76 u32 shmem_read_header(struct scmi_shared_mem __iomem *shmem)  in shmem_read_header()  argument
78 	return ioread32(&shmem->msg_header);  in shmem_read_header()
81 void shmem_fetch_response(struct scmi_shared_mem __iomem *shmem,  in shmem_fetch_response()  argument
84 	xfer->hdr.status = ioread32(shmem->msg_payload);  in shmem_fetch_response()
85 	/* Skip the length of header and status in shmem area i.e 8 bytes */  in shmem_fetch_response()
86 	xfer->rx.len = min_t(size_t, xfer->rx.len,  in shmem_fetch_response()
87 			     ioread32(&shmem->length) - 8);  in shmem_fetch_response()
90 	memcpy_fromio(xfer->rx.buf, shmem->msg_payload + 4, xfer->rx.len);  in shmem_fetch_response()
93 void shmem_fetch_notification(struct scmi_shared_mem __iomem *shmem,  in shmem_fetch_notification()  argument
96 	/* Skip only the length of header in shmem area i.e 4 bytes */  in shmem_fetch_notification()
97 	xfer->rx.len = min_t(size_t, max_len, ioread32(&shmem->length) - 4);  in shmem_fetch_notification()
100 	memcpy_fromio(xfer->rx.buf, shmem->msg_payload, xfer->rx.len);  in shmem_fetch_notification()
103 void shmem_clear_channel(struct scmi_shared_mem __iomem *shmem)  in shmem_clear_channel()  argument
105 	iowrite32(SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE, &shmem->channel_status);  in shmem_clear_channel()
108 bool shmem_poll_done(struct scmi_shared_mem __iomem *shmem,  in shmem_poll_done()  argument
113 	xfer_id = MSG_XTRACT_TOKEN(ioread32(&shmem->msg_header));  in shmem_poll_done()
115 	if (xfer->hdr.seq != xfer_id)  in shmem_poll_done()
118 	return ioread32(&shmem->channel_status) &  in shmem_poll_done()