1 // SPDX-License-Identifier: GPL-2.0
3  * System Control and Management Interface (SCMI) Message SMC/HVC
9 #include <linux/arm-smccc.h>
20  * struct scmi_smc - Structure representing a SCMI smc transport
25  * @func_id: smc/hvc call function id
37 	struct device_node *np = of_parse_phandle(dev->of_node, "shmem", 0);  in smc_chan_available()
48 	struct device *cdev = cinfo->dev;  in smc_chan_setup()
57 		return -ENODEV;  in smc_chan_setup()
61 		return -ENOMEM;  in smc_chan_setup()
63 	np = of_parse_phandle(cdev->of_node, "shmem", 0);  in smc_chan_setup()
72 	scmi_info->shmem = devm_ioremap(dev, res.start, size);  in smc_chan_setup()
73 	if (!scmi_info->shmem) {  in smc_chan_setup()
75 		return -EADDRNOTAVAIL;  in smc_chan_setup()
78 	ret = of_property_read_u32(dev->of_node, "arm,smc-id", &func_id);  in smc_chan_setup()
82 	scmi_info->func_id = func_id;  in smc_chan_setup()
83 	scmi_info->cinfo = cinfo;  in smc_chan_setup()
84 	mutex_init(&scmi_info->shmem_lock);  in smc_chan_setup()
85 	cinfo->transport_info = scmi_info;  in smc_chan_setup()
90 static int smc_chan_free(int id, void *p, void *data)  in smc_chan_free()  argument
93 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_chan_free()
95 	cinfo->transport_info = NULL;  in smc_chan_free()
96 	scmi_info->cinfo = NULL;  in smc_chan_free()
98 	scmi_free_channel(cinfo, data, id);  in smc_chan_free()
106 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_send_message()
109 	mutex_lock(&scmi_info->shmem_lock);  in smc_send_message()
111 	shmem_tx_prepare(scmi_info->shmem, xfer);  in smc_send_message()
113 	arm_smccc_1_1_invoke(scmi_info->func_id, 0, 0, 0, 0, 0, 0, 0, &res);  in smc_send_message()
114 	scmi_rx_callback(scmi_info->cinfo, shmem_read_header(scmi_info->shmem));  in smc_send_message()
116 	mutex_unlock(&scmi_info->shmem_lock);  in smc_send_message()
120 		return -EOPNOTSUPP;  in smc_send_message()
127 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_fetch_response()
129 	shmem_fetch_response(scmi_info->shmem, xfer);  in smc_fetch_response()
135 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_poll_done()
137 	return shmem_poll_done(scmi_info->shmem, xfer);  in smc_poll_done()