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
24  * @cinfo: SCMI channel info
25  * @shmem: Transmit/Receive shared memory area
34 	struct scmi_shared_mem __iomem *shmem;  member
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()
79 	if (!of_device_is_compatible(np, "arm,scmi-shmem"))  in smc_chan_setup()
80 		return -ENXIO;  in smc_chan_setup()
85 		dev_err(cdev, "failed to get SCMI Tx shared memory\n");  in smc_chan_setup()
90 	scmi_info->shmem = devm_ioremap(dev, res.start, size);  in smc_chan_setup()
91 	if (!scmi_info->shmem) {  in smc_chan_setup()
92 		dev_err(dev, "failed to ioremap SCMI Tx shared memory\n");  in smc_chan_setup()
93 		return -EADDRNOTAVAIL;  in smc_chan_setup()
96 	ret = of_property_read_u32(dev->of_node, "arm,smc-id", &func_id);  in smc_chan_setup()
105 	irq = of_irq_get_byname(cdev->of_node, "a2p");  in smc_chan_setup()
111 			dev_err(dev, "failed to setup SCMI smc irq\n");  in smc_chan_setup()
114 		init_completion(&scmi_info->tx_complete);  in smc_chan_setup()
115 		scmi_info->irq = irq;  in smc_chan_setup()
118 	scmi_info->func_id = func_id;  in smc_chan_setup()
119 	scmi_info->cinfo = cinfo;  in smc_chan_setup()
120 	mutex_init(&scmi_info->shmem_lock);  in smc_chan_setup()
121 	cinfo->transport_info = scmi_info;  in smc_chan_setup()
129 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_chan_free()
131 	cinfo->transport_info = NULL;  in smc_chan_free()
132 	scmi_info->cinfo = NULL;  in smc_chan_free()
142 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_send_message()
145 	mutex_lock(&scmi_info->shmem_lock);  in smc_send_message()
147 	shmem_tx_prepare(scmi_info->shmem, xfer);  in smc_send_message()
149 	if (scmi_info->irq)  in smc_send_message()
150 		reinit_completion(&scmi_info->tx_complete);  in smc_send_message()
152 	arm_smccc_1_1_invoke(scmi_info->func_id, 0, 0, 0, 0, 0, 0, 0, &res);  in smc_send_message()
154 	if (scmi_info->irq)  in smc_send_message()
155 		wait_for_completion(&scmi_info->tx_complete);  in smc_send_message()
157 	scmi_rx_callback(scmi_info->cinfo,  in smc_send_message()
158 			 shmem_read_header(scmi_info->shmem), NULL);  in smc_send_message()
160 	mutex_unlock(&scmi_info->shmem_lock);  in smc_send_message()
164 		return -EOPNOTSUPP;  in smc_send_message()
171 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_fetch_response()
173 	shmem_fetch_response(scmi_info->shmem, xfer);  in smc_fetch_response()
179 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_poll_done()
181 	return shmem_poll_done(scmi_info->shmem, xfer);  in smc_poll_done()