1 // SPDX-License-Identifier: GPL-2.0
19  * struct scmi_mailbox - Structure representing a SCMI mailbox transport
22  * @chan: Transmit/Receive mailbox uni/bi-directional channel
41 	shmem_tx_prepare(smbox->shmem, m, smbox->cinfo);  in tx_prepare()
54 	 * a previous timed-out reply which arrived late could be wrongly  in rx_callback()
57 	if (cl->knows_txdone && !shmem_channel_free(smbox->shmem)) {  in rx_callback()
58 		dev_warn(smbox->cinfo->dev, "Ignoring spurious A2P IRQ !\n");  in rx_callback()
62 	scmi_rx_callback(smbox->cinfo, shmem_read_header(smbox->shmem), NULL);  in rx_callback()
74 	num_mb = of_count_phandle_with_args(of_node, "mboxes", "#mbox-cells");  in mailbox_chan_available()
79 					   "#mbox-cells", idx, NULL);  in mailbox_chan_available()
83  * mailbox_chan_validate  - Validate transport configuration and map channels
102 	struct device_node *np = cdev->of_node;  in mailbox_chan_validate()
104 	num_mb = of_count_phandle_with_args(np, "mboxes", "#mbox-cells");  in mailbox_chan_validate()
112 			 "Invalid channel descriptor for '%s' - mbs:%d  shm:%d\n",  in mailbox_chan_validate()
114 		return -EINVAL;  in mailbox_chan_validate()
126 			ret = -EINVAL;  in mailbox_chan_validate()
163 	struct device *cdev = cinfo->dev;  in mailbox_chan_setup()
176 		return -ENODEV;  in mailbox_chan_setup()
180 		return -ENOMEM;  in mailbox_chan_setup()
182 	shmem = of_parse_phandle(cdev->of_node, "shmem", idx);  in mailbox_chan_setup()
183 	if (!of_device_is_compatible(shmem, "arm,scmi-shmem")) {  in mailbox_chan_setup()
185 		return -ENXIO;  in mailbox_chan_setup()
196 	smbox->shmem = devm_ioremap(dev, res.start, size);  in mailbox_chan_setup()
197 	if (!smbox->shmem) {  in mailbox_chan_setup()
199 		return -EADDRNOTAVAIL;  in mailbox_chan_setup()
202 	cl = &smbox->cl;  in mailbox_chan_setup()
203 	cl->dev = cdev;  in mailbox_chan_setup()
204 	cl->tx_prepare = tx ? tx_prepare : NULL;  in mailbox_chan_setup()
205 	cl->rx_callback = rx_callback;  in mailbox_chan_setup()
206 	cl->tx_block = false;  in mailbox_chan_setup()
207 	cl->knows_txdone = tx;  in mailbox_chan_setup()
209 	smbox->chan = mbox_request_channel(cl, tx ? 0 : p2a_chan);  in mailbox_chan_setup()
210 	if (IS_ERR(smbox->chan)) {  in mailbox_chan_setup()
211 		ret = PTR_ERR(smbox->chan);  in mailbox_chan_setup()
212 		if (ret != -EPROBE_DEFER)  in mailbox_chan_setup()
220 		smbox->chan_receiver = mbox_request_channel(cl, a2p_rx_chan);  in mailbox_chan_setup()
221 		if (IS_ERR(smbox->chan_receiver)) {  in mailbox_chan_setup()
222 			ret = PTR_ERR(smbox->chan_receiver);  in mailbox_chan_setup()
223 			if (ret != -EPROBE_DEFER)  in mailbox_chan_setup()
229 	cinfo->transport_info = smbox;  in mailbox_chan_setup()
230 	smbox->cinfo = cinfo;  in mailbox_chan_setup()
238 	struct scmi_mailbox *smbox = cinfo->transport_info;  in mailbox_chan_free()
240 	if (smbox && !IS_ERR(smbox->chan)) {  in mailbox_chan_free()
241 		mbox_free_channel(smbox->chan);  in mailbox_chan_free()
242 		mbox_free_channel(smbox->chan_receiver);  in mailbox_chan_free()
243 		cinfo->transport_info = NULL;  in mailbox_chan_free()
244 		smbox->chan = NULL;  in mailbox_chan_free()
245 		smbox->chan_receiver = NULL;  in mailbox_chan_free()
246 		smbox->cinfo = NULL;  in mailbox_chan_free()
255 	struct scmi_mailbox *smbox = cinfo->transport_info;  in mailbox_send_message()
258 	ret = mbox_send_message(smbox->chan, xfer);  in mailbox_send_message()
260 	/* mbox_send_message returns non-negative value on success, so reset */  in mailbox_send_message()
270 	struct scmi_mailbox *smbox = cinfo->transport_info;  in mailbox_mark_txdone()
278 	mbox_client_txdone(smbox->chan, ret);  in mailbox_mark_txdone()
284 	struct scmi_mailbox *smbox = cinfo->transport_info;  in mailbox_fetch_response()
286 	shmem_fetch_response(smbox->shmem, xfer);  in mailbox_fetch_response()
292 	struct scmi_mailbox *smbox = cinfo->transport_info;  in mailbox_fetch_notification()
294 	shmem_fetch_notification(smbox->shmem, max_len, xfer);  in mailbox_fetch_notification()
299 	struct scmi_mailbox *smbox = cinfo->transport_info;  in mailbox_clear_channel()
301 	shmem_clear_channel(smbox->shmem);  in mailbox_clear_channel()
307 	struct scmi_mailbox *smbox = cinfo->transport_info;  in mailbox_poll_done()
309 	return shmem_poll_done(smbox->shmem, xfer);  in mailbox_poll_done()