1 // SPDX-License-Identifier: GPL-2.0
3  * I/O Processor (IOP) ADB Driver
5  * Based on via-cuda.c by Paul Mackerras.
7  * 1999-07-01 (jmt) - First implementation for new driver architecture.
9  * 1999-07-31 (jmt) - First working version.
67 	req->complete = 1;  in adb_iop_done()
68 	current_req = req->next;  in adb_iop_done()
69 	if (req->done)  in adb_iop_done()
70 		(*req->done)(req);  in adb_iop_done()
79  * This will be called when a packet has been successfully sent.
103 	struct adb_iopmsg *amsg = (struct adb_iopmsg *)msg->message;  in adb_iop_listen()
104 	u8 addr = (amsg->cmd & ADDR_MASK) >> 4;  in adb_iop_listen()
105 	u8 op = amsg->cmd & OP_MASK;  in adb_iop_listen()
117 	switch (amsg->flags & (ADB_IOP_EXPLICIT |  in adb_iop_listen()
125 			if (req->reply_expected) {  in adb_iop_listen()
126 				req->reply_len = amsg->count + 1;  in adb_iop_listen()
127 				memcpy(req->reply, &amsg->cmd, req->reply_len);  in adb_iop_listen()
135 		    amsg->cmd == ADB_READREG(addr, 0))  in adb_iop_listen()
136 			adb_input(&amsg->cmd, amsg->count + 1, 1);  in adb_iop_listen()
139 	msg->reply[0] = autopoll_addr ? ADB_IOP_AUTOPOLL : 0;  in adb_iop_listen()
140 	msg->reply[1] = 0;  in adb_iop_listen()
141 	msg->reply[2] = autopoll_addr ? ADB_READREG(autopoll_addr, 0) : 0;  in adb_iop_listen()
151  * Start sending an ADB packet, IOP style
153  * There isn't much to do other than hand the packet over to the IOP
162 	/* get the packet to send */  in adb_iop_start()
167 	/* The IOP takes MacII-style packets, so strip the initial  in adb_iop_start()
171 	amsg.count = req->nbytes - 2;  in adb_iop_start()
174 	 * &amsg.cmd a pointer to the beginning of a full ADB packet.  in adb_iop_start()
176 	memcpy(&amsg.cmd, req->data + 1, req->nbytes - 1);  in adb_iop_start()
178 	req->sent = 1;  in adb_iop_start()
191 		return -ENODEV;  in adb_iop_probe()
211 		while (!req->complete)  in adb_iop_send_request()
221 	if ((req->nbytes < 2) || (req->data[0] != ADB_PACKET)) {  in adb_iop_write()
222 		req->complete = 1;  in adb_iop_write()
223 		return -EINVAL;  in adb_iop_write()
226 	req->next = NULL;  in adb_iop_write()
227 	req->sent = 0;  in adb_iop_write()
228 	req->complete = 0;  in adb_iop_write()
229 	req->reply_len = 0;  in adb_iop_write()
234 		last_req->next = req;  in adb_iop_write()
251 	struct adb_iopmsg *amsg = (struct adb_iopmsg *)msg->message;  in adb_iop_set_ap_complete()
253 	autopoll_devs = get_unaligned_be16(amsg->data);  in adb_iop_set_ap_complete()
256 	autopoll_addr = autopoll_devs ? (ffs(autopoll_devs) - 1) : 0;  in adb_iop_set_ap_complete()