1 // SPDX-License-Identifier: GPL-2.0+
29 	struct mbox_chan *ch;  member
69 	-EINVAL, /* IMX_SC_ERR_VERSION */
70 	-EINVAL, /* IMX_SC_ERR_CONFIG */
71 	-EINVAL, /* IMX_SC_ERR_PARM */
72 	-EACCES, /* IMX_SC_ERR_NOACCESS */
73 	-EACCES, /* IMX_SC_ERR_LOCKED */
74 	-ERANGE, /* IMX_SC_ERR_UNAVAILABLE */
75 	-EEXIST, /* IMX_SC_ERR_NOTFOUND */
76 	-EPERM,	 /* IMX_SC_ERR_NOPOWER */
77 	-EPIPE,	 /* IMX_SC_ERR_IPC */
78 	-EBUSY,	 /* IMX_SC_ERR_BUSY */
79 	-EIO,	 /* IMX_SC_ERR_FAIL */
88 	return -EIO;  in imx_sc_to_linux_errno()
97 		return -EPROBE_DEFER;  in imx_scu_get_handle()
104 /* Callback called when the word of a message is ack-ed, eg read by SCU */
109 	complete(&sc_chan->tx_done);  in imx_scu_tx_done()
115 	struct imx_sc_ipc *sc_ipc = sc_chan->sc_ipc;  in imx_scu_rx_callback()
120 	if (!sc_ipc->msg) {  in imx_scu_rx_callback()
121 		dev_warn(sc_ipc->dev, "unexpected rx idx %d 0x%08x, ignore!\n",  in imx_scu_rx_callback()
122 				sc_chan->idx, *data);  in imx_scu_rx_callback()
126 	if (sc_ipc->fast_ipc) {  in imx_scu_rx_callback()
128 		sc_ipc->rx_size = hdr->size;  in imx_scu_rx_callback()
129 		sc_ipc->msg[0] = *data++;  in imx_scu_rx_callback()
131 		for (i = 1; i < sc_ipc->rx_size; i++)  in imx_scu_rx_callback()
132 			sc_ipc->msg[i] = *data++;  in imx_scu_rx_callback()
134 		complete(&sc_ipc->done);  in imx_scu_rx_callback()
139 	if (sc_chan->idx == 0) {  in imx_scu_rx_callback()
141 		sc_ipc->rx_size = hdr->size;  in imx_scu_rx_callback()
142 		dev_dbg(sc_ipc->dev, "msg rx size %u\n", sc_ipc->rx_size);  in imx_scu_rx_callback()
143 		if (sc_ipc->rx_size > 4)  in imx_scu_rx_callback()
144 			dev_warn(sc_ipc->dev, "RPC does not support receiving over 4 words: %u\n",  in imx_scu_rx_callback()
145 				 sc_ipc->rx_size);  in imx_scu_rx_callback()
148 	sc_ipc->msg[sc_chan->idx] = *data;  in imx_scu_rx_callback()
149 	sc_ipc->count++;  in imx_scu_rx_callback()
151 	dev_dbg(sc_ipc->dev, "mu %u msg %u 0x%x\n", sc_chan->idx,  in imx_scu_rx_callback()
152 		sc_ipc->count, *data);  in imx_scu_rx_callback()
154 	if ((sc_ipc->rx_size != 0) && (sc_ipc->count == sc_ipc->rx_size))  in imx_scu_rx_callback()
155 		complete(&sc_ipc->done);  in imx_scu_rx_callback()
169 		return -EINVAL;  in imx_scu_ipc_write()
171 	dev_dbg(sc_ipc->dev, "RPC SVC %u FUNC %u SIZE %u\n", hdr.svc,  in imx_scu_ipc_write()
172 		hdr.func, hdr.size);  in imx_scu_ipc_write()
174 	size = sc_ipc->fast_ipc ? 1 : hdr.size;  in imx_scu_ipc_write()
176 		sc_chan = &sc_ipc->chans[i % 4];  in imx_scu_ipc_write()
187 		if (!sc_ipc->fast_ipc) {  in imx_scu_ipc_write()
188 			wait_for_completion(&sc_chan->tx_done);  in imx_scu_ipc_write()
189 			reinit_completion(&sc_chan->tx_done);  in imx_scu_ipc_write()
192 		ret = mbox_send_message(sc_chan->ch, &data[i]);  in imx_scu_ipc_write()
210 		return -EINVAL;  in imx_scu_call_rpc()
212 	mutex_lock(&sc_ipc->lock);  in imx_scu_call_rpc()
213 	reinit_completion(&sc_ipc->done);  in imx_scu_call_rpc()
216 		sc_ipc->msg = msg;  in imx_scu_call_rpc()
217 		saved_svc = ((struct imx_sc_rpc_msg *)msg)->svc;  in imx_scu_call_rpc()
218 		saved_func = ((struct imx_sc_rpc_msg *)msg)->func;  in imx_scu_call_rpc()
220 	sc_ipc->count = 0;  in imx_scu_call_rpc()
223 		dev_err(sc_ipc->dev, "RPC send msg failed: %d\n", ret);  in imx_scu_call_rpc()
228 		if (!wait_for_completion_timeout(&sc_ipc->done,  in imx_scu_call_rpc()
230 			dev_err(sc_ipc->dev, "RPC send msg timeout\n");  in imx_scu_call_rpc()
231 			mutex_unlock(&sc_ipc->lock);  in imx_scu_call_rpc()
232 			return -ETIMEDOUT;  in imx_scu_call_rpc()
235 		/* response status is stored in hdr->func field */  in imx_scu_call_rpc()
237 		ret = hdr->func;  in imx_scu_call_rpc()
240 		 * in hdr->func, but they do have response data, those special  in imx_scu_call_rpc()
251 	sc_ipc->msg = NULL;  in imx_scu_call_rpc()
252 	mutex_unlock(&sc_ipc->lock);  in imx_scu_call_rpc()
254 	dev_dbg(sc_ipc->dev, "RPC SVC done\n");  in imx_scu_call_rpc()
262 	struct device *dev = &pdev->dev;  in imx_scu_probe()
274 		return -ENOMEM;  in imx_scu_probe()
276 	ret = of_parse_phandle_with_args(pdev->dev.of_node, "mboxes",  in imx_scu_probe()
277 					 "#mbox-cells", 0, &args);  in imx_scu_probe()
281 	sc_ipc->fast_ipc = of_device_is_compatible(args.np, "fsl,imx8-mu-scu");  in imx_scu_probe()
283 	num_channel = sc_ipc->fast_ipc ? 2 : SCU_MU_CHAN_NUM;  in imx_scu_probe()
289 					      i - num_channel / 2);  in imx_scu_probe()
292 			return -ENOMEM;  in imx_scu_probe()
294 		sc_chan = &sc_ipc->chans[i];  in imx_scu_probe()
295 		cl = &sc_chan->cl;  in imx_scu_probe()
296 		cl->dev = dev;  in imx_scu_probe()
297 		cl->tx_block = false;  in imx_scu_probe()
298 		cl->knows_txdone = true;  in imx_scu_probe()
299 		cl->rx_callback = imx_scu_rx_callback;  in imx_scu_probe()
301 		if (!sc_ipc->fast_ipc) {  in imx_scu_probe()
303 			cl->tx_done = imx_scu_tx_done;  in imx_scu_probe()
304 			init_completion(&sc_chan->tx_done);  in imx_scu_probe()
305 			complete(&sc_chan->tx_done);  in imx_scu_probe()
308 		sc_chan->sc_ipc = sc_ipc;  in imx_scu_probe()
309 		sc_chan->idx = i % (num_channel / 2);  in imx_scu_probe()
310 		sc_chan->ch = mbox_request_channel_byname(cl, chan_name);  in imx_scu_probe()
311 		if (IS_ERR(sc_chan->ch)) {  in imx_scu_probe()
312 			ret = PTR_ERR(sc_chan->ch);  in imx_scu_probe()
313 			if (ret != -EPROBE_DEFER)  in imx_scu_probe()
325 	sc_ipc->dev = dev;  in imx_scu_probe()
326 	mutex_init(&sc_ipc->lock);  in imx_scu_probe()
327 	init_completion(&sc_ipc->done);  in imx_scu_probe()
346 	{ .compatible = "fsl,imx-scu", },
352 		.name = "imx-scu",