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2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/drivers/macintosh/adb-iop.c
....@@ -7,10 +7,6 @@
77  * 1999-07-01 (jmt) - First implementation for new driver architecture.
88  *
99  * 1999-07-31 (jmt) - First working version.
10
- *
11
- * TODO:
12
- *
13
- * o Implement SRQ handling.
1410  */
1511 
1612 #include <linux/types.h>
....@@ -18,29 +14,24 @@
1814 #include <linux/mm.h>
1915 #include <linux/delay.h>
2016 #include <linux/init.h>
21
-#include <linux/proc_fs.h>
2217 
23
-#include <asm/macintosh.h> 
24
-#include <asm/macints.h> 
18
+#include <asm/macintosh.h>
19
+#include <asm/macints.h>
2520 #include <asm/mac_iop.h>
26
-#include <asm/mac_oss.h>
2721 #include <asm/adb_iop.h>
22
+#include <asm/unaligned.h>
2823 
29
-#include <linux/adb.h> 
30
-
31
-/*#define DEBUG_ADB_IOP*/
24
+#include <linux/adb.h>
3225 
3326 static struct adb_request *current_req;
3427 static struct adb_request *last_req;
35
-#if 0
36
-static unsigned char reply_buff[16];
37
-static unsigned char *reply_ptr;
38
-#endif
28
+static unsigned int autopoll_devs;
29
+static u8 autopoll_addr;
3930 
4031 static enum adb_iop_state {
41
-    idle,
42
-    sending,
43
-    awaiting_reply
32
+	idle,
33
+	sending,
34
+	awaiting_reply
4435 } adb_iop_state;
4536 
4637 static void adb_iop_start(void);
....@@ -52,6 +43,11 @@
5243 static void adb_iop_poll(void);
5344 static int adb_iop_reset_bus(void);
5445 
46
+/* ADB command byte structure */
47
+#define ADDR_MASK       0xF0
48
+#define OP_MASK         0x0C
49
+#define TALK            0x0C
50
+
5551 struct adb_driver adb_iop_driver = {
5652 	.name         = "ISM IOP",
5753 	.probe        = adb_iop_probe,
....@@ -62,12 +58,19 @@
6258 	.reset_bus    = adb_iop_reset_bus
6359 };
6460 
65
-static void adb_iop_end_req(struct adb_request *req, int state)
61
+static void adb_iop_done(void)
6662 {
63
+	struct adb_request *req = current_req;
64
+
65
+	adb_iop_state = idle;
66
+
6767 	req->complete = 1;
6868 	current_req = req->next;
69
-	if (req->done) (*req->done)(req);
70
-	adb_iop_state = state;
69
+	if (req->done)
70
+		(*req->done)(req);
71
+
72
+	if (adb_iop_state == idle)
73
+		adb_iop_start();
7174 }
7275 
7376 /*
....@@ -78,15 +81,11 @@
7881 
7982 static void adb_iop_complete(struct iop_msg *msg)
8083 {
81
-	struct adb_request *req;
8284 	unsigned long flags;
8385 
8486 	local_irq_save(flags);
8587 
86
-	req = current_req;
87
-	if ((adb_iop_state == sending) && req && req->reply_expected) {
88
-		adb_iop_state = awaiting_reply;
89
-	}
88
+	adb_iop_state = awaiting_reply;
9089 
9190 	local_irq_restore(flags);
9291 }
....@@ -94,59 +93,57 @@
9493 /*
9594  * Listen for ADB messages from the IOP.
9695  *
97
- * This will be called when unsolicited messages (usually replies to TALK
98
- * commands or autopoll packets) are received.
96
+ * This will be called when unsolicited IOP messages are received.
97
+ * These IOP messages can carry ADB autopoll responses and also occur
98
+ * after explicit ADB commands.
9999  */
100100 
101101 static void adb_iop_listen(struct iop_msg *msg)
102102 {
103
-	struct adb_iopmsg *amsg = (struct adb_iopmsg *) msg->message;
104
-	struct adb_request *req;
103
+	struct adb_iopmsg *amsg = (struct adb_iopmsg *)msg->message;
104
+	u8 addr = (amsg->cmd & ADDR_MASK) >> 4;
105
+	u8 op = amsg->cmd & OP_MASK;
105106 	unsigned long flags;
106
-#ifdef DEBUG_ADB_IOP
107
-	int i;
108
-#endif
107
+	bool req_done = false;
109108 
110109 	local_irq_save(flags);
111110 
112
-	req = current_req;
111
+	/* Responses to Talk commands may be unsolicited as they are
112
+	 * produced when the IOP polls devices. They are mostly timeouts.
113
+	 */
114
+	if (op == TALK && ((1 << addr) & autopoll_devs))
115
+		autopoll_addr = addr;
113116 
114
-#ifdef DEBUG_ADB_IOP
115
-	printk("adb_iop_listen %p: rcvd packet, %d bytes: %02X %02X", req,
116
-		(uint) amsg->count + 2, (uint) amsg->flags, (uint) amsg->cmd);
117
-	for (i = 0; i < amsg->count; i++)
118
-		printk(" %02X", (uint) amsg->data[i]);
119
-	printk("\n");
120
-#endif
117
+	switch (amsg->flags & (ADB_IOP_EXPLICIT |
118
+			       ADB_IOP_AUTOPOLL |
119
+			       ADB_IOP_TIMEOUT)) {
120
+	case ADB_IOP_EXPLICIT:
121
+	case ADB_IOP_EXPLICIT | ADB_IOP_TIMEOUT:
122
+		if (adb_iop_state == awaiting_reply) {
123
+			struct adb_request *req = current_req;
121124 
122
-	/* Handle a timeout. Timeout packets seem to occur even after */
123
-	/* we've gotten a valid reply to a TALK, so I'm assuming that */
124
-	/* a "timeout" is actually more like an "end-of-data" signal. */
125
-	/* We need to send back a timeout packet to the IOP to shut   */
126
-	/* it up, plus complete the current request, if any.          */
125
+			if (req->reply_expected) {
126
+				req->reply_len = amsg->count + 1;
127
+				memcpy(req->reply, &amsg->cmd, req->reply_len);
128
+			}
127129 
128
-	if (amsg->flags & ADB_IOP_TIMEOUT) {
129
-		msg->reply[0] = ADB_IOP_TIMEOUT | ADB_IOP_AUTOPOLL;
130
-		msg->reply[1] = 0;
131
-		msg->reply[2] = 0;
132
-		if (req && (adb_iop_state != idle)) {
133
-			adb_iop_end_req(req, idle);
130
+			req_done = true;
134131 		}
135
-	} else {
136
-		/* TODO: is it possible for more than one chunk of data  */
137
-		/*       to arrive before the timeout? If so we need to */
138
-		/*       use reply_ptr here like the other drivers do.  */
139
-		if ((adb_iop_state == awaiting_reply) &&
140
-		    (amsg->flags & ADB_IOP_EXPLICIT)) {
141
-			req->reply_len = amsg->count + 1;
142
-			memcpy(req->reply, &amsg->cmd, req->reply_len);
143
-		} else {
144
-			adb_input(&amsg->cmd, amsg->count + 1,
145
-				  amsg->flags & ADB_IOP_AUTOPOLL);
146
-		}
147
-		memcpy(msg->reply, msg->message, IOP_MSG_LEN);
132
+		break;
133
+	case ADB_IOP_AUTOPOLL:
134
+		if (((1 << addr) & autopoll_devs) &&
135
+		    amsg->cmd == ADB_READREG(addr, 0))
136
+			adb_input(&amsg->cmd, amsg->count + 1, 1);
137
+		break;
148138 	}
139
+	msg->reply[0] = autopoll_addr ? ADB_IOP_AUTOPOLL : 0;
140
+	msg->reply[1] = 0;
141
+	msg->reply[2] = autopoll_addr ? ADB_READREG(autopoll_addr, 0) : 0;
149142 	iop_complete_message(msg);
143
+
144
+	if (req_done)
145
+		adb_iop_done();
146
+
150147 	local_irq_restore(flags);
151148 }
152149 
....@@ -159,69 +156,60 @@
159156 
160157 static void adb_iop_start(void)
161158 {
162
-	unsigned long flags;
163159 	struct adb_request *req;
164160 	struct adb_iopmsg amsg;
165
-#ifdef DEBUG_ADB_IOP
166
-	int i;
167
-#endif
168161 
169162 	/* get the packet to send */
170163 	req = current_req;
171
-	if (!req) return;
164
+	if (!req)
165
+		return;
172166 
173
-	local_irq_save(flags);
174
-
175
-#ifdef DEBUG_ADB_IOP
176
-	printk("adb_iop_start %p: sending packet, %d bytes:", req, req->nbytes);
177
-	for (i = 0 ; i < req->nbytes ; i++)
178
-		printk(" %02X", (uint) req->data[i]);
179
-	printk("\n");
180
-#endif
181
-
182
-	/* The IOP takes MacII-style packets, so */
183
-	/* strip the initial ADB_PACKET byte.    */
184
-
167
+	/* The IOP takes MacII-style packets, so strip the initial
168
+	 * ADB_PACKET byte.
169
+	 */
185170 	amsg.flags = ADB_IOP_EXPLICIT;
186171 	amsg.count = req->nbytes - 2;
187172 
188
-	/* amsg.data immediately follows amsg.cmd, effectively making */
189
-	/* amsg.cmd a pointer to the beginning of a full ADB packet.  */
173
+	/* amsg.data immediately follows amsg.cmd, effectively making
174
+	 * &amsg.cmd a pointer to the beginning of a full ADB packet.
175
+	 */
190176 	memcpy(&amsg.cmd, req->data + 1, req->nbytes - 1);
191177 
192178 	req->sent = 1;
193179 	adb_iop_state = sending;
194
-	local_irq_restore(flags);
195180 
196
-	/* Now send it. The IOP manager will call adb_iop_complete */
197
-	/* when the packet has been sent.                          */
198
-
199
-	iop_send_message(ADB_IOP, ADB_CHAN, req,
200
-			 sizeof(amsg), (__u8 *) &amsg, adb_iop_complete);
181
+	/* Now send it. The IOP manager will call adb_iop_complete
182
+	 * when the message has been sent.
183
+	 */
184
+	iop_send_message(ADB_IOP, ADB_CHAN, req, sizeof(amsg), (__u8 *)&amsg,
185
+			 adb_iop_complete);
201186 }
202187 
203
-int adb_iop_probe(void)
188
+static int adb_iop_probe(void)
204189 {
205
-	if (!iop_ism_present) return -ENODEV;
190
+	if (!iop_ism_present)
191
+		return -ENODEV;
206192 	return 0;
207193 }
208194 
209
-int adb_iop_init(void)
195
+static int adb_iop_init(void)
210196 {
211
-	printk("adb: IOP ISM driver v0.4 for Unified ADB.\n");
197
+	pr_info("adb: IOP ISM driver v0.4 for Unified ADB\n");
212198 	iop_listen(ADB_IOP, ADB_CHAN, adb_iop_listen, "ADB");
213199 	return 0;
214200 }
215201 
216
-int adb_iop_send_request(struct adb_request *req, int sync)
202
+static int adb_iop_send_request(struct adb_request *req, int sync)
217203 {
218204 	int err;
219205 
220206 	err = adb_iop_write(req);
221
-	if (err) return err;
207
+	if (err)
208
+		return err;
222209 
223210 	if (sync) {
224
-		while (!req->complete) adb_iop_poll();
211
+		while (!req->complete)
212
+			adb_iop_poll();
225213 	}
226214 	return 0;
227215 }
....@@ -235,14 +223,14 @@
235223 		return -EINVAL;
236224 	}
237225 
238
-	local_irq_save(flags);
239
-
240226 	req->next = NULL;
241227 	req->sent = 0;
242228 	req->complete = 0;
243229 	req->reply_len = 0;
244230 
245
-	if (current_req != 0) {
231
+	local_irq_save(flags);
232
+
233
+	if (current_req) {
246234 		last_req->next = req;
247235 		last_req = req;
248236 	} else {
....@@ -250,36 +238,60 @@
250238 		last_req = req;
251239 	}
252240 
241
+	if (adb_iop_state == idle)
242
+		adb_iop_start();
243
+
253244 	local_irq_restore(flags);
254
-	if (adb_iop_state == idle) adb_iop_start();
245
+
255246 	return 0;
256247 }
257248 
258
-int adb_iop_autopoll(int devs)
249
+static void adb_iop_set_ap_complete(struct iop_msg *msg)
259250 {
260
-	/* TODO: how do we enable/disable autopoll? */
251
+	struct adb_iopmsg *amsg = (struct adb_iopmsg *)msg->message;
252
+
253
+	autopoll_devs = get_unaligned_be16(amsg->data);
254
+	if (autopoll_devs & (1 << autopoll_addr))
255
+		return;
256
+	autopoll_addr = autopoll_devs ? (ffs(autopoll_devs) - 1) : 0;
257
+}
258
+
259
+static int adb_iop_autopoll(int devs)
260
+{
261
+	struct adb_iopmsg amsg;
262
+	unsigned long flags;
263
+	unsigned int mask = (unsigned int)devs & 0xFFFE;
264
+
265
+	local_irq_save(flags);
266
+
267
+	amsg.flags = ADB_IOP_SET_AUTOPOLL | (mask ? ADB_IOP_AUTOPOLL : 0);
268
+	amsg.count = 2;
269
+	amsg.cmd = 0;
270
+	put_unaligned_be16(mask, amsg.data);
271
+
272
+	iop_send_message(ADB_IOP, ADB_CHAN, NULL, sizeof(amsg), (__u8 *)&amsg,
273
+			 adb_iop_set_ap_complete);
274
+
275
+	local_irq_restore(flags);
276
+
261277 	return 0;
262278 }
263279 
264
-void adb_iop_poll(void)
280
+static void adb_iop_poll(void)
265281 {
266
-	if (adb_iop_state == idle) adb_iop_start();
267282 	iop_ism_irq_poll(ADB_IOP);
268283 }
269284 
270
-int adb_iop_reset_bus(void)
285
+static int adb_iop_reset_bus(void)
271286 {
272
-	struct adb_request req = {
273
-		.reply_expected = 0,
274
-		.nbytes = 2,
275
-		.data = { ADB_PACKET, 0 },
276
-	};
287
+	struct adb_request req;
277288 
278
-	adb_iop_write(&req);
279
-	while (!req.complete) {
280
-		adb_iop_poll();
281
-		schedule();
282
-	}
289
+	/* Command = 0, Address = ignored */
290
+	adb_request(&req, NULL, ADBREQ_NOSEND, 1, ADB_BUSRESET);
291
+	adb_iop_send_request(&req, 1);
292
+
293
+	/* Don't want any more requests during the Global Reset low time. */
294
+	mdelay(3);
283295 
284296 	return 0;
285297 }