forked from ~ljy/RK356X_SDK_RELEASE
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2023-12-09 95099d4622f8cb224d94e314c7a8e0df60b13f87 
 kernel/drivers/macintosh/via-macii.c
....@@ -12,7 +12,7 @@
1212  *
1313  * 1999-08-02 (jmt) - Initial rewrite for Unified ADB.
1414  * 2000-03-29 Tony Mantler <tonym@mac.linux-m68k.org>
15
- * 				- Big overhaul, should actually work now.
15
+ *            - Big overhaul, should actually work now.
1616  * 2006-12-31 Finn Thain - Another overhaul.
1717  *
1818  * Suggested reading:
....@@ -23,7 +23,7 @@
2323  * Apple's "ADB Analyzer" bus sniffer is invaluable:
2424  *   ftp://ftp.apple.com/developer/Tool_Chest/Devices_-_Hardware/Apple_Desktop_Bus/
2525  */
26
- 
26
+
2727 #include <stdarg.h>
2828 #include <linux/types.h>
2929 #include <linux/errno.h>
....@@ -77,7 +77,13 @@
7777 #define ST_ODD		0x20		/* ADB state: odd data byte */
7878 #define ST_IDLE		0x30		/* ADB state: idle, nothing to send */
7979 
80
-static int  macii_init_via(void);
80
+/* ADB command byte structure */
81
+#define ADDR_MASK	0xF0
82
+#define CMD_MASK	0x0F
83
+#define OP_MASK		0x0C
84
+#define TALK		0x0C
85
+
86
+static int macii_init_via(void);
8187 static void macii_start(void);
8288 static irqreturn_t macii_interrupt(int irq, void *arg);
8389 static void macii_queue_poll(void);
....@@ -104,64 +110,51 @@
104110 	idle,
105111 	sending,
106112 	reading,
107
-	read_done,
108113 } macii_state;
109114 
110115 static struct adb_request *current_req; /* first request struct in the queue */
111116 static struct adb_request *last_req;     /* last request struct in the queue */
112117 static unsigned char reply_buf[16];        /* storage for autopolled replies */
113118 static unsigned char *reply_ptr;     /* next byte in reply_buf or req->reply */
114
-static int reading_reply;        /* store reply in reply_buf else req->reply */
119
+static bool reading_reply;       /* store reply in reply_buf else req->reply */
115120 static int data_index;      /* index of the next byte to send from req->data */
116121 static int reply_len; /* number of bytes received in reply_buf or req->reply */
117122 static int status;          /* VIA's ADB status bits captured upon interrupt */
118
-static int last_status;              /* status bits as at previous interrupt */
119
-static int srq_asserted;     /* have to poll for the device that asserted it */
120
-static int command_byte;         /* the most recent command byte transmitted */
121
-static int autopoll_devs;      /* bits set are device addresses to be polled */
122
-
123
-/* Sanity check for request queue. Doesn't check for cycles. */
124
-static int request_is_queued(struct adb_request *req) {
125
-	struct adb_request *cur;
126
-	unsigned long flags;
127
-	local_irq_save(flags);
128
-	cur = current_req;
129
-	while (cur) {
130
-		if (cur == req) {
131
-			local_irq_restore(flags);
132
-			return 1;
133
-		}
134
-		cur = cur->next;
135
-	}
136
-	local_irq_restore(flags);
137
-	return 0;
138
-}
123
+static bool bus_timeout;                   /* no data was sent by the device */
124
+static bool srq_asserted;    /* have to poll for the device that asserted it */
125
+static u8 last_cmd;              /* the most recent command byte transmitted */
126
+static u8 last_talk_cmd;    /* the most recent Talk command byte transmitted */
127
+static u8 last_poll_cmd; /* the most recent Talk R0 command byte transmitted */
128
+static unsigned int autopoll_devs;  /* bits set are device addresses to poll */
139129 
140130 /* Check for MacII style ADB */
141131 static int macii_probe(void)
142132 {
143
-	if (macintosh_config->adb_type != MAC_ADB_II) return -ENODEV;
133
+	if (macintosh_config->adb_type != MAC_ADB_II)
134
+		return -ENODEV;
144135 
145136 	via = via1;
146137 
147
-	printk("adb: Mac II ADB Driver v1.0 for Unified ADB\n");
138
+	pr_info("adb: Mac II ADB Driver v1.0 for Unified ADB\n");
148139 	return 0;
149140 }
150141 
151142 /* Initialize the driver */
152
-int macii_init(void)
143
+static int macii_init(void)
153144 {
154145 	unsigned long flags;
155146 	int err;
156
-	
147
+
157148 	local_irq_save(flags);
158
-	
149
+
159150 	err = macii_init_via();
160
-	if (err) goto out;
151
+	if (err)
152
+		goto out;
161153 
162154 	err = request_irq(IRQ_MAC_ADB, macii_interrupt, 0, "ADB",
163155 			  macii_interrupt);
164
-	if (err) goto out;
156
+	if (err)
157
+		goto out;
165158 
166159 	macii_state = idle;
167160 out:
....@@ -169,7 +162,7 @@
169162 	return err;
170163 }
171164 
172
-/* initialize the hardware */	
165
+/* initialize the hardware */
173166 static int macii_init_via(void)
174167 {
175168 	unsigned char x;
....@@ -179,7 +172,6 @@
179172 
180173 	/* Set up state: idle */
181174 	via[B] |= ST_IDLE;
182
-	last_status = via[B] & (ST_MASK|CTLR_IRQ);
183175 
184176 	/* Shift register on input */
185177 	via[ACR] = (via[ACR] & ~SR_CTRL) | SR_EXT;
....@@ -193,37 +185,49 @@
193185 /* Send an ADB poll (Talk Register 0 command prepended to the request queue) */
194186 static void macii_queue_poll(void)
195187 {
196
-	/* No point polling the active device as it will never assert SRQ, so
197
-	 * poll the next device in the autopoll list. This could leave us
198
-	 * stuck in a polling loop if an unprobed device is asserting SRQ.
199
-	 * In theory, that could only happen if a device was plugged in after
200
-	 * probing started. Unplugging it again will break the cycle.
201
-	 * (Simply polling the next higher device often ends up polling almost
202
-	 * every device (after wrapping around), which takes too long.)
203
-	 */
204
-	int device_mask;
205
-	int next_device;
206188 	static struct adb_request req;
189
+	unsigned char poll_command;
190
+	unsigned int poll_addr;
207191 
208
-	if (!autopoll_devs) return;
192
+	/* This only polls devices in the autopoll list, which assumes that
193
+	 * unprobed devices never assert SRQ. That could happen if a device was
194
+	 * plugged in after the adb bus scan. Unplugging it again will resolve
195
+	 * the problem. This behaviour is similar to MacOS.
196
+	 */
197
+	if (!autopoll_devs)
198
+		return;
209199 
210
-	device_mask = (1 << (((command_byte & 0xF0) >> 4) + 1)) - 1;
211
-	if (autopoll_devs & ~device_mask)
212
-		next_device = ffs(autopoll_devs & ~device_mask) - 1;
213
-	else
214
-		next_device = ffs(autopoll_devs) - 1;
200
+	/* The device most recently polled may not be the best device to poll
201
+	 * right now. Some other device(s) may have signalled SRQ (the active
202
+	 * device won't do that). Or the autopoll list may have been changed.
203
+	 * Try polling the next higher address.
204
+	 */
205
+	poll_addr = (last_poll_cmd & ADDR_MASK) >> 4;
206
+	if ((srq_asserted && last_cmd == last_poll_cmd) ||
207
+	    !(autopoll_devs & (1 << poll_addr))) {
208
+		unsigned int higher_devs;
215209 
216
-	BUG_ON(request_is_queued(&req));
210
+		higher_devs = autopoll_devs & -(1 << (poll_addr + 1));
211
+		poll_addr = ffs(higher_devs ? higher_devs : autopoll_devs) - 1;
212
+	}
217213 
218
-	adb_request(&req, NULL, ADBREQ_NOSEND, 1,
219
-	            ADB_READREG(next_device, 0));
214
+	/* Send a Talk Register 0 command */
215
+	poll_command = ADB_READREG(poll_addr, 0);
216
+
217
+	/* No need to repeat this Talk command. The transceiver will do that
218
+	 * as long as it is idle.
219
+	 */
220
+	if (poll_command == last_cmd)
221
+		return;
222
+
223
+	adb_request(&req, NULL, ADBREQ_NOSEND, 1, poll_command);
220224 
221225 	req.sent = 0;
222226 	req.complete = 0;
223227 	req.reply_len = 0;
224228 	req.next = current_req;
225229 
226
-	if (current_req != NULL) {
230
+	if (WARN_ON(current_req)) {
227231 		current_req = &req;
228232 	} else {
229233 		current_req = &req;
....@@ -235,36 +239,34 @@
235239 static int macii_send_request(struct adb_request *req, int sync)
236240 {
237241 	int err;
238
-	unsigned long flags;
239242 
240
-	BUG_ON(request_is_queued(req));
241
-
242
-	local_irq_save(flags);
243243 	err = macii_write(req);
244
-	local_irq_restore(flags);
244
+	if (err)
245
+		return err;
245246 
246
-	if (!err && sync) {
247
-		while (!req->complete) {
247
+	if (sync)
248
+		while (!req->complete)
248249 			macii_poll();
249
-		}
250
-		BUG_ON(request_is_queued(req));
251
-	}
252250 
253
-	return err;
251
+	return 0;
254252 }
255253 
256254 /* Send an ADB request (append to request queue) */
257255 static int macii_write(struct adb_request *req)
258256 {
257
+	unsigned long flags;
258
+
259259 	if (req->nbytes < 2 || req->data[0] != ADB_PACKET || req->nbytes > 15) {
260260 		req->complete = 1;
261261 		return -EINVAL;
262262 	}
263
-	
263
+
264264 	req->next = NULL;
265265 	req->sent = 0;
266266 	req->complete = 0;
267267 	req->reply_len = 0;
268
+
269
+	local_irq_save(flags);
268270 
269271 	if (current_req != NULL) {
270272 		last_req->next = req;
....@@ -272,66 +274,50 @@
272274 	} else {
273275 		current_req = req;
274276 		last_req = req;
275
-		if (macii_state == idle) macii_start();
277
+		if (macii_state == idle)
278
+			macii_start();
276279 	}
280
+
281
+	local_irq_restore(flags);
282
+
277283 	return 0;
278284 }
279285 
280286 /* Start auto-polling */
281287 static int macii_autopoll(int devs)
282288 {
283
-	static struct adb_request req;
284289 	unsigned long flags;
285
-	int err = 0;
286
-
287
-	/* bit 1 == device 1, and so on. */
288
-	autopoll_devs = devs & 0xFFFE;
289
-
290
-	if (!autopoll_devs) return 0;
291290 
292291 	local_irq_save(flags);
293292 
294
-	if (current_req == NULL) {
295
-		/* Send a Talk Reg 0. The controller will repeatedly transmit
296
-		 * this as long as it is idle.
297
-		 */
298
-		adb_request(&req, NULL, ADBREQ_NOSEND, 1,
299
-		            ADB_READREG(ffs(autopoll_devs) - 1, 0));
300
-		err = macii_write(&req);
293
+	/* bit 1 == device 1, and so on. */
294
+	autopoll_devs = (unsigned int)devs & 0xFFFE;
295
+
296
+	if (!current_req) {
297
+		macii_queue_poll();
298
+		if (current_req && macii_state == idle)
299
+			macii_start();
301300 	}
302301 
303302 	local_irq_restore(flags);
304
-	return err;
305
-}
306303 
307
-static inline int need_autopoll(void) {
308
-	/* Was the last command Talk Reg 0
309
-	 * and is the target on the autopoll list?
310
-	 */
311
-	if ((command_byte & 0x0F) == 0x0C &&
312
-	    ((1 << ((command_byte & 0xF0) >> 4)) & autopoll_devs))
313
-		return 0;
314
-	return 1;
304
+	return 0;
315305 }
316306 
317307 /* Prod the chip without interrupts */
318308 static void macii_poll(void)
319309 {
320
-	disable_irq(IRQ_MAC_ADB);
321310 	macii_interrupt(0, NULL);
322
-	enable_irq(IRQ_MAC_ADB);
323311 }
324312 
325313 /* Reset the bus */
326314 static int macii_reset_bus(void)
327315 {
328
-	static struct adb_request req;
329
-	
330
-	if (request_is_queued(&req))
331
-		return 0;
316
+	struct adb_request req;
332317 
333318 	/* Command = 0, Address = ignored */
334
-	adb_request(&req, NULL, 0, 1, ADB_BUSRESET);
319
+	adb_request(&req, NULL, ADBREQ_NOSEND, 1, ADB_BUSRESET);
320
+	macii_send_request(&req, 1);
335321 
336322 	/* Don't want any more requests during the Global Reset low time. */
337323 	udelay(3000);
....@@ -346,17 +332,11 @@
346332 
347333 	req = current_req;
348334 
349
-	BUG_ON(req == NULL);
350
-
351
-	BUG_ON(macii_state != idle);
352
-
353335 	/* Now send it. Be careful though, that first byte of the request
354336 	 * is actually ADB_PACKET; the real data begins at index 1!
355337 	 * And req->nbytes is the number of bytes of real data plus one.
356338 	 */
357339 
358
-	/* store command byte */
359
-	command_byte = req->data[1];
360340 	/* Output mode */
361341 	via[ACR] |= SR_OUT;
362342 	/* Load data */
....@@ -366,6 +346,9 @@
366346 
367347 	macii_state = sending;
368348 	data_index = 2;
349
+
350
+	bus_timeout = false;
351
+	srq_asserted = false;
369352 }
370353 
371354 /*
....@@ -374,177 +357,210 @@
374357  * generating shift register interrupts (SR_INT) for us. This means there has
375358  * to be activity on the ADB bus. The chip will poll to achieve this.
376359  *
377
- * The basic ADB state machine was left unchanged from the original MacII code
378
- * by Alan Cox, which was based on the CUDA driver for PowerMac. 
379
- * The syntax of the ADB status lines is totally different on MacII,
380
- * though. MacII uses the states Command -> Even -> Odd -> Even ->...-> Idle
381
- * for sending and Idle -> Even -> Odd -> Even ->...-> Idle for receiving.
382
- * Start and end of a receive packet are signalled by asserting /IRQ on the
383
- * interrupt line (/IRQ means the CTLR_IRQ bit in port B; not to be confused
384
- * with the VIA shift register interrupt. /IRQ never actually interrupts the
385
- * processor, it's just an ordinary input.)
360
+ * The VIA Port B output signalling works as follows. After the ADB transceiver
361
+ * sees a transition on the PB4 and PB5 lines it will crank over the VIA shift
362
+ * register which eventually raises the SR_INT interrupt. The PB4/PB5 outputs
363
+ * are toggled with each byte as the ADB transaction progresses.
364
+ *
365
+ * Request with no reply expected (and empty transceiver buffer):
366
+ *     CMD -> IDLE
367
+ * Request with expected reply packet (or with buffered autopoll packet):
368
+ *     CMD -> EVEN -> ODD -> EVEN -> ... -> IDLE
369
+ * Unsolicited packet:
370
+ *     IDLE -> EVEN -> ODD -> EVEN -> ... -> IDLE
386371  */
387372 static irqreturn_t macii_interrupt(int irq, void *arg)
388373 {
389374 	int x;
390
-	static int entered;
391375 	struct adb_request *req;
376
+	unsigned long flags;
377
+
378
+	local_irq_save(flags);
392379 
393380 	if (!arg) {
394381 		/* Clear the SR IRQ flag when polling. */
395382 		if (via[IFR] & SR_INT)
396383 			via[IFR] = SR_INT;
397
-		else
384
+		else {
385
+			local_irq_restore(flags);
398386 			return IRQ_NONE;
387
+		}
399388 	}
400389 
401
-	BUG_ON(entered++);
402
-
403
-	last_status = status;
404
-	status = via[B] & (ST_MASK|CTLR_IRQ);
390
+	status = via[B] & (ST_MASK | CTLR_IRQ);
405391 
406392 	switch (macii_state) {
407
-		case idle:
408
-			if (reading_reply) {
409
-				reply_ptr = current_req->reply;
410
-			} else {
411
-				BUG_ON(current_req != NULL);
412
-				reply_ptr = reply_buf;
413
-			}
393
+	case idle:
394
+		WARN_ON((status & ST_MASK) != ST_IDLE);
414395 
415
-			x = via[SR];
396
+		reply_ptr = reply_buf;
397
+		reading_reply = false;
416398 
417
-			if ((status & CTLR_IRQ) && (x == 0xFF)) {
418
-				/* Bus timeout without SRQ sequence:
419
-				 *     data is "FF" while CTLR_IRQ is "H"
420
-				 */
421
-				reply_len = 0;
422
-				srq_asserted = 0;
423
-				macii_state = read_done;
424
-			} else {
425
-				macii_state = reading;
426
-				*reply_ptr = x;
427
-				reply_len = 1;
428
-			}
399
+		bus_timeout = false;
400
+		srq_asserted = false;
429401 
430
-			/* set ADB state = even for first data byte */
431
-			via[B] = (via[B] & ~ST_MASK) | ST_EVEN;
402
+		x = via[SR];
403
+
404
+		if (!(status & CTLR_IRQ)) {
405
+			/* /CTLR_IRQ asserted in idle state means we must
406
+			 * read an autopoll reply from the transceiver buffer.
407
+			 */
408
+			macii_state = reading;
409
+			*reply_ptr = x;
410
+			reply_len = 1;
411
+		} else {
412
+			/* bus timeout */
413
+			reply_len = 0;
432414 			break;
415
+		}
433416 
434
-		case sending:
435
-			req = current_req;
436
-			if (data_index >= req->nbytes) {
437
-				req->sent = 1;
438
-				macii_state = idle;
417
+		/* set ADB state = even for first data byte */
418
+		via[B] = (via[B] & ~ST_MASK) | ST_EVEN;
419
+		break;
439420 
440
-				if (req->reply_expected) {
441
-					reading_reply = 1;
442
-				} else {
443
-					req->complete = 1;
444
-					current_req = req->next;
445
-					if (req->done) (*req->done)(req);
421
+	case sending:
422
+		req = current_req;
446423 
447
-					if (current_req)
448
-						macii_start();
449
-					else
450
-						if (need_autopoll())
451
-							macii_autopoll(autopoll_devs);
452
-				}
453
-
454
-				if (macii_state == idle) {
455
-					/* reset to shift in */
456
-					via[ACR] &= ~SR_OUT;
457
-					x = via[SR];
458
-					/* set ADB state idle - might get SRQ */
459
-					via[B] = (via[B] & ~ST_MASK) | ST_IDLE;
460
-				}
461
-			} else {
462
-				via[SR] = req->data[data_index++];
463
-
464
-				if ( (via[B] & ST_MASK) == ST_CMD ) {
465
-					/* just sent the command byte, set to EVEN */
466
-					via[B] = (via[B] & ~ST_MASK) | ST_EVEN;
467
-				} else {
468
-					/* invert state bits, toggle ODD/EVEN */
469
-					via[B] ^= ST_MASK;
470
-				}
471
-			}
472
-			break;
473
-
474
-		case reading:
475
-			x = via[SR];
476
-			BUG_ON((status & ST_MASK) == ST_CMD ||
477
-			       (status & ST_MASK) == ST_IDLE);
478
-
479
-			/* Bus timeout with SRQ sequence:
480
-			 *     data is "XX FF"      while CTLR_IRQ is "L L"
481
-			 * End of packet without SRQ sequence:
482
-			 *     data is "XX...YY 00" while CTLR_IRQ is "L...H L"
483
-			 * End of packet SRQ sequence:
484
-			 *     data is "XX...YY 00" while CTLR_IRQ is "L...L L"
485
-			 * (where XX is the first response byte and
486
-			 * YY is the last byte of valid response data.)
424
+		if (status == (ST_CMD | CTLR_IRQ)) {
425
+			/* /CTLR_IRQ de-asserted after the command byte means
426
+			 * the host can continue with the transaction.
487427 			 */
488428 
489
-			srq_asserted = 0;
490
-			if (!(status & CTLR_IRQ)) {
491
-				if (x == 0xFF) {
492
-					if (!(last_status & CTLR_IRQ)) {
493
-						macii_state = read_done;
494
-						reply_len = 0;
495
-						srq_asserted = 1;
496
-					}
497
-				} else if (x == 0x00) {
498
-					macii_state = read_done;
499
-					if (!(last_status & CTLR_IRQ))
500
-						srq_asserted = 1;
501
-				}
429
+			/* Store command byte */
430
+			last_cmd = req->data[1];
431
+			if ((last_cmd & OP_MASK) == TALK) {
432
+				last_talk_cmd = last_cmd;
433
+				if ((last_cmd & CMD_MASK) == ADB_READREG(0, 0))
434
+					last_poll_cmd = last_cmd;
502435 			}
436
+		}
503437 
504
-			if (macii_state == reading) {
505
-				BUG_ON(reply_len > 15);
506
-				reply_ptr++;
507
-				*reply_ptr = x;
508
-				reply_len++;
509
-			}
438
+		if (status == ST_CMD) {
439
+			/* /CTLR_IRQ asserted after the command byte means we
440
+			 * must read an autopoll reply. The first byte was
441
+			 * lost because the shift register was an output.
442
+			 */
443
+			macii_state = reading;
510444 
511
-			/* invert state bits, toggle ODD/EVEN */
512
-			via[B] ^= ST_MASK;
513
-			break;
445
+			reading_reply = false;
446
+			reply_ptr = reply_buf;
447
+			*reply_ptr = last_talk_cmd;
448
+			reply_len = 1;
514449 
515
-		case read_done:
450
+			/* reset to shift in */
451
+			via[ACR] &= ~SR_OUT;
516452 			x = via[SR];
453
+		} else if (data_index >= req->nbytes) {
454
+			req->sent = 1;
517455 
518
-			if (reading_reply) {
519
-				reading_reply = 0;
520
-				req = current_req;
521
-				req->reply_len = reply_len;
456
+			if (req->reply_expected) {
457
+				macii_state = reading;
458
+
459
+				reading_reply = true;
460
+				reply_ptr = req->reply;
461
+				*reply_ptr = req->data[1];
462
+				reply_len = 1;
463
+
464
+				via[ACR] &= ~SR_OUT;
465
+				x = via[SR];
466
+			} else if ((req->data[1] & OP_MASK) == TALK) {
467
+				macii_state = reading;
468
+
469
+				reading_reply = false;
470
+				reply_ptr = reply_buf;
471
+				*reply_ptr = req->data[1];
472
+				reply_len = 1;
473
+
474
+				via[ACR] &= ~SR_OUT;
475
+				x = via[SR];
476
+
522477 				req->complete = 1;
523478 				current_req = req->next;
524
-				if (req->done) (*req->done)(req);
525
-			} else if (reply_len && autopoll_devs)
526
-				adb_input(reply_buf, reply_len, 0);
479
+				if (req->done)
480
+					(*req->done)(req);
481
+			} else {
482
+				macii_state = idle;
527483 
528
-			macii_state = idle;
484
+				req->complete = 1;
485
+				current_req = req->next;
486
+				if (req->done)
487
+					(*req->done)(req);
488
+				break;
489
+			}
490
+		} else {
491
+			via[SR] = req->data[data_index++];
492
+		}
529493 
530
-			/* SRQ seen before, initiate poll now */
531
-			if (srq_asserted)
532
-				macii_queue_poll();
494
+		if ((via[B] & ST_MASK) == ST_CMD) {
495
+			/* just sent the command byte, set to EVEN */
496
+			via[B] = (via[B] & ~ST_MASK) | ST_EVEN;
497
+		} else {
498
+			/* invert state bits, toggle ODD/EVEN */
499
+			via[B] ^= ST_MASK;
500
+		}
501
+		break;
533502 
534
-			if (current_req)
535
-				macii_start();
536
-			else
537
-				if (need_autopoll())
538
-					macii_autopoll(autopoll_devs);
503
+	case reading:
504
+		x = via[SR];
505
+		WARN_ON((status & ST_MASK) == ST_CMD ||
506
+			(status & ST_MASK) == ST_IDLE);
539507 
540
-			if (macii_state == idle)
541
-				via[B] = (via[B] & ~ST_MASK) | ST_IDLE;
542
-			break;
508
+		if (!(status & CTLR_IRQ)) {
509
+			if (status == ST_EVEN && reply_len == 1) {
510
+				bus_timeout = true;
511
+			} else if (status == ST_ODD && reply_len == 2) {
512
+				srq_asserted = true;
513
+			} else {
514
+				macii_state = idle;
543515 
544
-		default:
516
+				if (bus_timeout)
517
+					reply_len = 0;
518
+
519
+				if (reading_reply) {
520
+					struct adb_request *req = current_req;
521
+
522
+					req->reply_len = reply_len;
523
+
524
+					req->complete = 1;
525
+					current_req = req->next;
526
+					if (req->done)
527
+						(*req->done)(req);
528
+				} else if (reply_len && autopoll_devs &&
529
+					   reply_buf[0] == last_poll_cmd) {
530
+					adb_input(reply_buf, reply_len, 1);
531
+				}
532
+				break;
533
+			}
534
+		}
535
+
536
+		if (reply_len < ARRAY_SIZE(reply_buf)) {
537
+			reply_ptr++;
538
+			*reply_ptr = x;
539
+			reply_len++;
540
+		}
541
+
542
+		/* invert state bits, toggle ODD/EVEN */
543
+		via[B] ^= ST_MASK;
544
+		break;
545
+
546
+	default:
545547 		break;
546548 	}
547549 
548
-	entered--;
550
+	if (macii_state == idle) {
551
+		if (!current_req)
552
+			macii_queue_poll();
553
+
554
+		if (current_req)
555
+			macii_start();
556
+
557
+		if (macii_state == idle) {
558
+			via[ACR] &= ~SR_OUT;
559
+			x = via[SR];
560
+			via[B] = (via[B] & ~ST_MASK) | ST_IDLE;
561
+		}
562
+	}
563
+
564
+	local_irq_restore(flags);
549565 	return IRQ_HANDLED;
550566 }