1 // SPDX-License-Identifier: GPL-2.0
47 #define APD	0x10		/* auto-poll data */
80 	.poll         = macio_adb_poll,
92 	return -ENODEV;  in macio_probe()
103 		return -ENXIO;  in macio_init()
106 		return -ENXIO;  in macio_init()
110 		return -ENOMEM;  in macio_init()
113 	out_8(&adb->ctrl.r, 0);  in macio_init()
114 	out_8(&adb->intr.r, 0);  in macio_init()
115 	out_8(&adb->error.r, 0);  in macio_init()
116 	out_8(&adb->active_hi.r, 0xff); /* for now, set all devices active */  in macio_init()
117 	out_8(&adb->active_lo.r, 0xff);  in macio_init()
118 	out_8(&adb->autopoll.r, APE);  in macio_init()
124 		return -EAGAIN;  in macio_init()
126 	out_8(&adb->intr_enb.r, DFB | TAG);  in macio_init()
128 	printk("adb: mac-io driver 1.0 for unified ADB\n");  in macio_init()
138 	out_8(&adb->active_hi.r, devs >> 8);  in macio_adb_autopoll()
139 	out_8(&adb->active_lo.r, devs);  in macio_adb_autopoll()
140 	out_8(&adb->autopoll.r, devs? APE: 0);  in macio_adb_autopoll()
156 	out_8(&adb->ctrl.r, in_8(&adb->ctrl.r) | ADB_RST);  in macio_adb_reset_bus()
157 	while ((in_8(&adb->ctrl.r) & ADB_RST) != 0) {  in macio_adb_reset_bus()
158 		if (--timeout == 0) {  in macio_adb_reset_bus()
159 			out_8(&adb->ctrl.r, in_8(&adb->ctrl.r) & ~ADB_RST);  in macio_adb_reset_bus()
161 			return -1;  in macio_adb_reset_bus()
174 	if (req->data[0] != ADB_PACKET)  in macio_send_request()
175 		return -EINVAL;  in macio_send_request()
177 	for (i = 0; i < req->nbytes - 1; ++i)  in macio_send_request()
178 		req->data[i] = req->data[i+1];  in macio_send_request()
179 	--req->nbytes;  in macio_send_request()
181 	req->next = NULL;  in macio_send_request()
182 	req->sent = 0;  in macio_send_request()
183 	req->complete = 0;  in macio_send_request()
184 	req->reply_len = 0;  in macio_send_request()
188 		last_req->next = req;  in macio_send_request()
192 		out_8(&adb->ctrl.r, in_8(&adb->ctrl.r) | TAR);  in macio_send_request()
197 		while (!req->complete)  in macio_send_request()
215 	if (in_8(&adb->intr.r) & TAG) {  in macio_adb_interrupt()
220 			for (i = 0; i < req->nbytes; ++i)  in macio_adb_interrupt()
221 				out_8(&adb->data[i].r, req->data[i]);  in macio_adb_interrupt()
222 			out_8(&adb->dcount.r, req->nbytes & HMB);  in macio_adb_interrupt()
223 			req->sent = 1;  in macio_adb_interrupt()
224 			if (req->reply_expected) {  in macio_adb_interrupt()
225 				out_8(&adb->ctrl.r, DTB + CRE);  in macio_adb_interrupt()
227 				out_8(&adb->ctrl.r, DTB);  in macio_adb_interrupt()
228 				current_req = req->next;  in macio_adb_interrupt()
231 					out_8(&adb->ctrl.r, in_8(&adb->ctrl.r) | TAR);  in macio_adb_interrupt()
234 		out_8(&adb->intr.r, 0);  in macio_adb_interrupt()
237 	if (in_8(&adb->intr.r) & DFB) {  in macio_adb_interrupt()
239 		err = in_8(&adb->error.r);  in macio_adb_interrupt()
240 		if (current_req && current_req->sent) {  in macio_adb_interrupt()
244 				req->reply_len = in_8(&adb->dcount.r) & HMB;  in macio_adb_interrupt()
245 				for (i = 0; i < req->reply_len; ++i)  in macio_adb_interrupt()
246 					req->reply[i] = in_8(&adb->data[i].r);  in macio_adb_interrupt()
248 			current_req = req->next;  in macio_adb_interrupt()
251 				out_8(&adb->ctrl.r, in_8(&adb->ctrl.r) | TAR);  in macio_adb_interrupt()
254 			n = in_8(&adb->dcount.r) & HMB;  in macio_adb_interrupt()
256 				ibuf[i] = in_8(&adb->data[i].r);  in macio_adb_interrupt()
258 			autopoll = (in_8(&adb->dcount.r) & APD) != 0;  in macio_adb_interrupt()
260 		out_8(&adb->error.r, 0);  in macio_adb_interrupt()
261 		out_8(&adb->intr.r, 0);  in macio_adb_interrupt()
265 	    void (*done)(struct adb_request *) = req->done;  in macio_adb_interrupt()
267 	    req->complete = 1;  in macio_adb_interrupt()
269     	     * struct request will survive to setting req->complete to 1  in macio_adb_interrupt()
285 	if (in_8(&adb->intr.r) != 0)  in macio_adb_poll()