1 // SPDX-License-Identifier: GPL-2.0
3  * System Control and Management Interface (SCMI) Message SMC/HVC
9 #include <linux/arm-smccc.h>
26  * smc/hvc call to keep it uniform across smc32/smc64 conventions.
30  * scmi instances that are using the same smc-id.
38 #define SHMEM_OFFSET(x) ((x) & (SHMEM_SIZE - 1))
41  * struct scmi_smc - Structure representing a SCMI smc transport
50  * @func_id: smc/hvc call function id
72 	scmi_rx_callback(scmi_info->cinfo,  in smc_msg_done_isr()
73 			 shmem_read_header(scmi_info->shmem), NULL);  in smc_msg_done_isr()
91 		atomic_set(&scmi_info->inflight, INFLIGHT_NONE);  in smc_channel_lock_init()
93 		mutex_init(&scmi_info->shmem_lock);  in smc_channel_lock_init()
100 	ret = atomic_cmpxchg(inflight, INFLIGHT_NONE, xfer->hdr.seq);  in smc_xfer_inflight()
110 		spin_until_cond(smc_xfer_inflight(xfer, &scmi_info->inflight));  in smc_channel_lock_acquire()
112 		mutex_lock(&scmi_info->shmem_lock);  in smc_channel_lock_acquire()
118 		atomic_set(&scmi_info->inflight, INFLIGHT_NONE);  in smc_channel_lock_release()
120 		mutex_unlock(&scmi_info->shmem_lock);  in smc_channel_lock_release()
126 	struct device *cdev = cinfo->dev;  in smc_chan_setup()
135 		return -ENODEV;  in smc_chan_setup()
139 		return -ENOMEM;  in smc_chan_setup()
141 	np = of_parse_phandle(cdev->of_node, "shmem", 0);  in smc_chan_setup()
142 	if (!of_device_is_compatible(np, "arm,scmi-shmem")) {  in smc_chan_setup()
144 		return -ENXIO;  in smc_chan_setup()
155 	scmi_info->shmem = devm_ioremap(dev, res.start, size);  in smc_chan_setup()
156 	if (!scmi_info->shmem) {  in smc_chan_setup()
158 		return -EADDRNOTAVAIL;  in smc_chan_setup()
161 	ret = of_property_read_u32(dev->of_node, "arm,smc-id", &func_id);  in smc_chan_setup()
165 	if (of_device_is_compatible(dev->of_node, "arm,scmi-smc-param")) {  in smc_chan_setup()
166 		scmi_info->param_page = SHMEM_PAGE(res.start);  in smc_chan_setup()
167 		scmi_info->param_offset = SHMEM_OFFSET(res.start);  in smc_chan_setup()
172 	 * the return of the SMC call.  in smc_chan_setup()
174 	scmi_info->irq = of_irq_get_byname(cdev->of_node, "a2p");  in smc_chan_setup()
175 	if (scmi_info->irq > 0) {  in smc_chan_setup()
176 		ret = request_irq(scmi_info->irq, smc_msg_done_isr,  in smc_chan_setup()
179 			dev_err(dev, "failed to setup SCMI smc irq\n");  in smc_chan_setup()
183 		cinfo->no_completion_irq = true;  in smc_chan_setup()
186 	scmi_info->func_id = func_id;  in smc_chan_setup()
187 	scmi_info->cinfo = cinfo;  in smc_chan_setup()
189 	cinfo->transport_info = scmi_info;  in smc_chan_setup()
194 static int smc_chan_free(int id, void *p, void *data)  in smc_chan_free()  argument
197 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_chan_free()
200 	if (scmi_info->irq > 0)  in smc_chan_free()
201 		free_irq(scmi_info->irq, scmi_info);  in smc_chan_free()
203 	cinfo->transport_info = NULL;  in smc_chan_free()
204 	scmi_info->cinfo = NULL;  in smc_chan_free()
212 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_send_message()
214 	unsigned long page = scmi_info->param_page;  in smc_send_message()
215 	unsigned long offset = scmi_info->param_offset;  in smc_send_message()
223 	shmem_tx_prepare(scmi_info->shmem, xfer, cinfo);  in smc_send_message()
225 	arm_smccc_1_1_invoke(scmi_info->func_id, page, offset, 0, 0, 0, 0, 0,  in smc_send_message()
231 		return -EOPNOTSUPP;  in smc_send_message()
240 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_fetch_response()
242 	shmem_fetch_response(scmi_info->shmem, xfer);  in smc_fetch_response()
248 	struct scmi_smc *scmi_info = cinfo->transport_info;  in smc_mark_txdone()
268 	 * Setting .sync_cmds_atomic_replies to true for SMC assumes that,
269 	 * once the SMC instruction has completed successfully, the issued