1 // SPDX-License-Identifier: GPL-2.0
3  * System Control and Management Interface (SCMI) Message SMC/HVC
9 #include <linux/arm-smccc.h>
22  * struct scmi_smc - Structure representing a SCMI smc transport
27  * @func_id: smc/hvc call function id
45 	complete(&scmi_info->tx_complete);  in smc_msg_done_isr()
52 	struct device_node *np = of_parse_phandle(dev->of_node, "shmem", 0);  in smc_chan_available()
63 	struct device *cdev = cinfo->dev;  in smc_chan_setup()
72 		return -ENODEV;  in smc_chan_setup()
76 		return -ENOMEM;  in smc_chan_setup()
78 	np = of_parse_phandle(cdev->of_node, "shmem", 0);  in smc_chan_setup()
87 	scmi_info->shmem = devm_ioremap(dev, res.start, size);  in smc_chan_setup()
88 	if (!scmi_info->shmem) {  in smc_chan_setup()
90 		return -EADDRNOTAVAIL;  in smc_chan_setup()
93 	ret = of_property_read_u32(dev->of_node, "arm,smc-id", &func_id);  in smc_chan_setup()
100 	 * the return of the SMC call.  in smc_chan_setup()
102 	irq = of_irq_get_byname(cdev->of_node, "a2p");  in smc_chan_setup()
108 			dev_err(dev, "failed to setup SCMI smc irq\n");  in smc_chan_setup()
111 		init_completion(&scmi_info->tx_complete);  in smc_chan_setup()
112 		scmi_info->irq = irq;  in smc_chan_setup()
115 	scmi_info->func_id = func_id;  in smc_chan_setup()
116 	scmi_info->cinfo = cinfo;  in smc_chan_setup()
117 	mutex_init(&scmi_info->shmem_lock);  in smc_chan_setup()
118 	cinfo->transport_info = scmi_info;  in smc_chan_setup()
123 static int smc_chan_free(int id, void *p, void *data)  in smc_chan_free()  argument
126 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_chan_free()
128 	cinfo->transport_info = NULL;  in smc_chan_free()
129 	scmi_info->cinfo = NULL;  in smc_chan_free()
131 	scmi_free_channel(cinfo, data, id);  in smc_chan_free()
139 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_send_message()
142 	mutex_lock(&scmi_info->shmem_lock);  in smc_send_message()
144 	shmem_tx_prepare(scmi_info->shmem, xfer);  in smc_send_message()
146 	if (scmi_info->irq)  in smc_send_message()
147 		reinit_completion(&scmi_info->tx_complete);  in smc_send_message()
149 	arm_smccc_1_1_invoke(scmi_info->func_id, 0, 0, 0, 0, 0, 0, 0, &res);  in smc_send_message()
151 	if (scmi_info->irq)  in smc_send_message()
152 		wait_for_completion(&scmi_info->tx_complete);  in smc_send_message()
154 	scmi_rx_callback(scmi_info->cinfo, shmem_read_header(scmi_info->shmem));  in smc_send_message()
156 	mutex_unlock(&scmi_info->shmem_lock);  in smc_send_message()
160 		return -EOPNOTSUPP;  in smc_send_message()
167 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_fetch_response()
169 	shmem_fetch_response(scmi_info->shmem, xfer);  in smc_fetch_response()
175 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_poll_done()
177 	return shmem_poll_done(scmi_info->shmem, xfer);  in smc_poll_done()