1 // SPDX-License-Identifier: GPL-2.0
3  * System Control and Management Interface (SCMI) Message SMC/HVC
9 #include <linux/arm-smccc.h>
24  * struct scmi_smc - Structure representing a SCMI smc transport
26  * @cinfo: SCMI channel info
27  * @shmem: Transmit/Receive shared memory area
37 	struct scmi_shared_mem __iomem *shmem;  member
38 	/* Protect access to shmem area */
49 	scmi_rx_callback(scmi_info->cinfo,  in smc_msg_done_isr()
50 			 shmem_read_header(scmi_info->shmem), NULL);  in smc_msg_done_isr()
57 	struct device_node *np = of_parse_phandle(dev->of_node, "shmem", 0);  in smc_chan_available()
68 		atomic_set(&scmi_info->inflight, INFLIGHT_NONE);  in smc_channel_lock_init()
70 		mutex_init(&scmi_info->shmem_lock);  in smc_channel_lock_init()
77 	ret = atomic_cmpxchg(inflight, INFLIGHT_NONE, xfer->hdr.seq);  in smc_xfer_inflight()
87 		spin_until_cond(smc_xfer_inflight(xfer, &scmi_info->inflight));  in smc_channel_lock_acquire()
89 		mutex_lock(&scmi_info->shmem_lock);  in smc_channel_lock_acquire()
95 		atomic_set(&scmi_info->inflight, INFLIGHT_NONE);  in smc_channel_lock_release()
97 		mutex_unlock(&scmi_info->shmem_lock);  in smc_channel_lock_release()
103 	struct device *cdev = cinfo->dev;  in smc_chan_setup()
112 		return -ENODEV;  in smc_chan_setup()
116 		return -ENOMEM;  in smc_chan_setup()
118 	np = of_parse_phandle(cdev->of_node, "shmem", 0);  in smc_chan_setup()
119 	if (!of_device_is_compatible(np, "arm,scmi-shmem"))  in smc_chan_setup()
120 		return -ENXIO;  in smc_chan_setup()
125 		dev_err(cdev, "failed to get SCMI Tx shared memory\n");  in smc_chan_setup()
130 	scmi_info->shmem = devm_ioremap(dev, res.start, size);  in smc_chan_setup()
131 	if (!scmi_info->shmem) {  in smc_chan_setup()
132 		dev_err(dev, "failed to ioremap SCMI Tx shared memory\n");  in smc_chan_setup()
133 		return -EADDRNOTAVAIL;  in smc_chan_setup()
136 	ret = of_property_read_u32(dev->of_node, "arm,smc-id", &func_id);  in smc_chan_setup()
145 	irq = of_irq_get_byname(cdev->of_node, "a2p");  in smc_chan_setup()
151 			dev_err(dev, "failed to setup SCMI smc irq\n");  in smc_chan_setup()
155 		cinfo->no_completion_irq = true;  in smc_chan_setup()
158 	scmi_info->func_id = func_id;  in smc_chan_setup()
159 	scmi_info->cinfo = cinfo;  in smc_chan_setup()
161 	cinfo->transport_info = scmi_info;  in smc_chan_setup()
169 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_chan_free()
171 	cinfo->transport_info = NULL;  in smc_chan_free()
172 	scmi_info->cinfo = NULL;  in smc_chan_free()
182 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_send_message()
191 	shmem_tx_prepare(scmi_info->shmem, xfer, cinfo);  in smc_send_message()
193 	arm_smccc_1_1_invoke(scmi_info->func_id, 0, 0, 0, 0, 0, 0, 0, &res);  in smc_send_message()
198 		return -EOPNOTSUPP;  in smc_send_message()
207 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_fetch_response()
209 	shmem_fetch_response(scmi_info->shmem, xfer);  in smc_fetch_response()
215 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_mark_txdone()
237 	 * SCMI command would have been already fully processed by the SCMI