1 files changed, 141 insertions, 130 deletions

diff --git a/drivers/macintosh/adb-iop.c b/drivers/macintosh/adb-iop.c
index f5f4da3d0b67..126dd1cfba8e 100644
--- a/drivers/macintosh/adb-iop.c
+++ b/drivers/macintosh/adb-iop.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * I/O Processor (IOP) ADB Driver
  * Written and (C) 1999 by Joshua M. Thompson (funaho@jurai.org)
@@ -6,10 +7,6 @@
  * 1999-07-01 (jmt) - First implementation for new driver architecture.
  *
  * 1999-07-31 (jmt) - First working version.
- *
- * TODO:
- *
- * o Implement SRQ handling.
  */
 
 #include <linux/types.h>
@@ -17,31 +14,24 @@
 #include <linux/mm.h>
 #include <linux/delay.h>
 #include <linux/init.h>
-#include <linux/proc_fs.h>
 
-#include <asm/macintosh.h> 
-#include <asm/macints.h> 
+#include <asm/macintosh.h>
+#include <asm/macints.h>
 #include <asm/mac_iop.h>
-#include <asm/mac_oss.h>
 #include <asm/adb_iop.h>
+#include <linux/unaligned.h>
 
-#include <linux/adb.h> 
-
-/*#define DEBUG_ADB_IOP*/
-
-extern void iop_ism_irq(int, void *);
+#include <linux/adb.h>
 
 static struct adb_request *current_req;
 static struct adb_request *last_req;
-#if 0
-static unsigned char reply_buff[16];
-static unsigned char *reply_ptr;
-#endif
+static unsigned int autopoll_devs;
+static u8 autopoll_addr;
 
 static enum adb_iop_state {
-    idle,
-    sending,
-    awaiting_reply
+	idle,
+	sending,
+	awaiting_reply
 } adb_iop_state;
 
 static void adb_iop_start(void);
@@ -53,22 +43,34 @@ static int adb_iop_autopoll(int);
 static void adb_iop_poll(void);
 static int adb_iop_reset_bus(void);
 
+/* ADB command byte structure */
+#define ADDR_MASK       0xF0
+#define OP_MASK         0x0C
+#define TALK            0x0C
+
 struct adb_driver adb_iop_driver = {
-	"ISM IOP",
-	adb_iop_probe,
-	adb_iop_init,
-	adb_iop_send_request,
-	adb_iop_autopoll,
-	adb_iop_poll,
-	adb_iop_reset_bus
+	.name         = "ISM IOP",
+	.probe        = adb_iop_probe,
+	.init         = adb_iop_init,
+	.send_request = adb_iop_send_request,
+	.autopoll     = adb_iop_autopoll,
+	.poll         = adb_iop_poll,
+	.reset_bus    = adb_iop_reset_bus
 };
 
-static void adb_iop_end_req(struct adb_request *req, int state)
+static void adb_iop_done(void)
 {
+	struct adb_request *req = current_req;
+
+	adb_iop_state = idle;
+
 	req->complete = 1;
 	current_req = req->next;
-	if (req->done) (*req->done)(req);
-	adb_iop_state = state;
+	if (req->done)
+		(*req->done)(req);
+
+	if (adb_iop_state == idle)
+		adb_iop_start();
 }
 
 /*
@@ -79,15 +81,11 @@ static void adb_iop_end_req(struct adb_request *req, int state)
 
 static void adb_iop_complete(struct iop_msg *msg)
 {
-	struct adb_request *req;
 	unsigned long flags;
 
 	local_irq_save(flags);
 
-	req = current_req;
-	if ((adb_iop_state == sending) && req && req->reply_expected) {
-		adb_iop_state = awaiting_reply;
-	}
+	adb_iop_state = awaiting_reply;
 
 	local_irq_restore(flags);
 }
@@ -95,59 +93,57 @@ static void adb_iop_complete(struct iop_msg *msg)
 /*
  * Listen for ADB messages from the IOP.
  *
- * This will be called when unsolicited messages (usually replies to TALK
- * commands or autopoll packets) are received.
+ * This will be called when unsolicited IOP messages are received.
+ * These IOP messages can carry ADB autopoll responses and also occur
+ * after explicit ADB commands.
  */
 
 static void adb_iop_listen(struct iop_msg *msg)
 {
-	struct adb_iopmsg *amsg = (struct adb_iopmsg *) msg->message;
-	struct adb_request *req;
+	struct adb_iopmsg *amsg = (struct adb_iopmsg *)msg->message;
+	u8 addr = (amsg->cmd & ADDR_MASK) >> 4;
+	u8 op = amsg->cmd & OP_MASK;
 	unsigned long flags;
-#ifdef DEBUG_ADB_IOP
-	int i;
-#endif
+	bool req_done = false;
 
 	local_irq_save(flags);
 
-	req = current_req;
-
-#ifdef DEBUG_ADB_IOP
-	printk("adb_iop_listen %p: rcvd packet, %d bytes: %02X %02X", req,
-		(uint) amsg->count + 2, (uint) amsg->flags, (uint) amsg->cmd);
-	for (i = 0; i < amsg->count; i++)
-		printk(" %02X", (uint) amsg->data[i]);
-	printk("\n");
-#endif
-
-	/* Handle a timeout. Timeout packets seem to occur even after */
-	/* we've gotten a valid reply to a TALK, so I'm assuming that */
-	/* a "timeout" is actually more like an "end-of-data" signal. */
-	/* We need to send back a timeout packet to the IOP to shut   */
-	/* it up, plus complete the current request, if any.          */
-
-	if (amsg->flags & ADB_IOP_TIMEOUT) {
-		msg->reply[0] = ADB_IOP_TIMEOUT | ADB_IOP_AUTOPOLL;
-		msg->reply[1] = 0;
-		msg->reply[2] = 0;
-		if (req && (adb_iop_state != idle)) {
-			adb_iop_end_req(req, idle);
-		}
-	} else {
-		/* TODO: is it possible for more than one chunk of data  */
-		/*       to arrive before the timeout? If so we need to */
-		/*       use reply_ptr here like the other drivers do.  */
-		if ((adb_iop_state == awaiting_reply) &&
-		    (amsg->flags & ADB_IOP_EXPLICIT)) {
-			req->reply_len = amsg->count + 1;
-			memcpy(req->reply, &amsg->cmd, req->reply_len);
-		} else {
-			adb_input(&amsg->cmd, amsg->count + 1,
-				  amsg->flags & ADB_IOP_AUTOPOLL);
+	/* Responses to Talk commands may be unsolicited as they are
+	 * produced when the IOP polls devices. They are mostly timeouts.
+	 */
+	if (op == TALK && ((1 << addr) & autopoll_devs))
+		autopoll_addr = addr;
+
+	switch (amsg->flags & (ADB_IOP_EXPLICIT |
+			       ADB_IOP_AUTOPOLL |
+			       ADB_IOP_TIMEOUT)) {
+	case ADB_IOP_EXPLICIT:
+	case ADB_IOP_EXPLICIT | ADB_IOP_TIMEOUT:
+		if (adb_iop_state == awaiting_reply) {
+			struct adb_request *req = current_req;
+
+			if (req->reply_expected) {
+				req->reply_len = amsg->count + 1;
+				memcpy(req->reply, &amsg->cmd, req->reply_len);
+			}
+
+			req_done = true;
 		}
-		memcpy(msg->reply, msg->message, IOP_MSG_LEN);
+		break;
+	case ADB_IOP_AUTOPOLL:
+		if (((1 << addr) & autopoll_devs) &&
+		    amsg->cmd == ADB_READREG(addr, 0))
+			adb_input(&amsg->cmd, amsg->count + 1, 1);
+		break;
 	}
+	msg->reply[0] = autopoll_addr ? ADB_IOP_AUTOPOLL : 0;
+	msg->reply[1] = 0;
+	msg->reply[2] = autopoll_addr ? ADB_READREG(autopoll_addr, 0) : 0;
 	iop_complete_message(msg);
+
+	if (req_done)
+		adb_iop_done();
+
 	local_irq_restore(flags);
 }
 
@@ -160,69 +156,60 @@ static void adb_iop_listen(struct iop_msg *msg)
 
 static void adb_iop_start(void)
 {
-	unsigned long flags;
 	struct adb_request *req;
 	struct adb_iopmsg amsg;
-#ifdef DEBUG_ADB_IOP
-	int i;
-#endif
 
 	/* get the packet to send */
 	req = current_req;
-	if (!req) return;
-
-	local_irq_save(flags);
-
-#ifdef DEBUG_ADB_IOP
-	printk("adb_iop_start %p: sending packet, %d bytes:", req, req->nbytes);
-	for (i = 0 ; i < req->nbytes ; i++)
-		printk(" %02X", (uint) req->data[i]);
-	printk("\n");
-#endif
-
-	/* The IOP takes MacII-style packets, so */
-	/* strip the initial ADB_PACKET byte.    */
+	if (!req)
+		return;
 
+	/* The IOP takes MacII-style packets, so strip the initial
+	 * ADB_PACKET byte.
+	 */
 	amsg.flags = ADB_IOP_EXPLICIT;
 	amsg.count = req->nbytes - 2;
 
-	/* amsg.data immediately follows amsg.cmd, effectively making */
-	/* amsg.cmd a pointer to the beginning of a full ADB packet.  */
+	/* amsg.data immediately follows amsg.cmd, effectively making
+	 * &amsg.cmd a pointer to the beginning of a full ADB packet.
+	 */
 	memcpy(&amsg.cmd, req->data + 1, req->nbytes - 1);
 
 	req->sent = 1;
 	adb_iop_state = sending;
-	local_irq_restore(flags);
 
-	/* Now send it. The IOP manager will call adb_iop_complete */
-	/* when the packet has been sent.                          */
-
-	iop_send_message(ADB_IOP, ADB_CHAN, req,
-			 sizeof(amsg), (__u8 *) &amsg, adb_iop_complete);
+	/* Now send it. The IOP manager will call adb_iop_complete
+	 * when the message has been sent.
+	 */
+	iop_send_message(ADB_IOP, ADB_CHAN, req, sizeof(amsg), (__u8 *)&amsg,
+			 adb_iop_complete);
 }
 
-int adb_iop_probe(void)
+static int adb_iop_probe(void)
 {
-	if (!iop_ism_present) return -ENODEV;
+	if (!iop_ism_present)
+		return -ENODEV;
 	return 0;
 }
 
-int adb_iop_init(void)
+static int adb_iop_init(void)
 {
-	printk("adb: IOP ISM driver v0.4 for Unified ADB.\n");
+	pr_info("adb: IOP ISM driver v0.4 for Unified ADB\n");
 	iop_listen(ADB_IOP, ADB_CHAN, adb_iop_listen, "ADB");
 	return 0;
 }
 
-int adb_iop_send_request(struct adb_request *req, int sync)
+static int adb_iop_send_request(struct adb_request *req, int sync)
 {
 	int err;
 
 	err = adb_iop_write(req);
-	if (err) return err;
+	if (err)
+		return err;
 
 	if (sync) {
-		while (!req->complete) adb_iop_poll();
+		while (!req->complete)
+			adb_iop_poll();
 	}
 	return 0;
 }
@@ -236,14 +223,14 @@ static int adb_iop_write(struct adb_request *req)
 		return -EINVAL;
 	}
 
-	local_irq_save(flags);
-
 	req->next = NULL;
 	req->sent = 0;
 	req->complete = 0;
 	req->reply_len = 0;
 
-	if (current_req != 0) {
+	local_irq_save(flags);
+
+	if (current_req) {
 		last_req->next = req;
 		last_req = req;
 	} else {
@@ -251,36 +238,60 @@ static int adb_iop_write(struct adb_request *req)
 		last_req = req;
 	}
 
+	if (adb_iop_state == idle)
+		adb_iop_start();
+
 	local_irq_restore(flags);
-	if (adb_iop_state == idle) adb_iop_start();
+
 	return 0;
 }
 
-int adb_iop_autopoll(int devs)
+static void adb_iop_set_ap_complete(struct iop_msg *msg)
+{
+	struct adb_iopmsg *amsg = (struct adb_iopmsg *)msg->message;
+
+	autopoll_devs = get_unaligned_be16(amsg->data);
+	if (autopoll_devs & (1 << autopoll_addr))
+		return;
+	autopoll_addr = autopoll_devs ? (ffs(autopoll_devs) - 1) : 0;
+}
+
+static int adb_iop_autopoll(int devs)
 {
-	/* TODO: how do we enable/disable autopoll? */
+	struct adb_iopmsg amsg;
+	unsigned long flags;
+	unsigned int mask = (unsigned int)devs & 0xFFFE;
+
+	local_irq_save(flags);
+
+	amsg.flags = ADB_IOP_SET_AUTOPOLL | (mask ? ADB_IOP_AUTOPOLL : 0);
+	amsg.count = 2;
+	amsg.cmd = 0;
+	put_unaligned_be16(mask, amsg.data);
+
+	iop_send_message(ADB_IOP, ADB_CHAN, NULL, sizeof(amsg), (__u8 *)&amsg,
+			 adb_iop_set_ap_complete);
+
+	local_irq_restore(flags);
+
 	return 0;
 }
 
-void adb_iop_poll(void)
+static void adb_iop_poll(void)
 {
-	if (adb_iop_state == idle) adb_iop_start();
-	iop_ism_irq(0, (void *) ADB_IOP);
+	iop_ism_irq_poll(ADB_IOP);
 }
 
-int adb_iop_reset_bus(void)
+static int adb_iop_reset_bus(void)
 {
-	struct adb_request req = {
-		.reply_expected = 0,
-		.nbytes = 2,
-		.data = { ADB_PACKET, 0 },
-	};
-
-	adb_iop_write(&req);
-	while (!req.complete) {
-		adb_iop_poll();
-		schedule();
-	}
+	struct adb_request req;
+
+	/* Command = 0, Address = ignored */
+	adb_request(&req, NULL, ADBREQ_NOSEND, 1, ADB_BUSRESET);
+	adb_iop_send_request(&req, 1);
+
+	/* Don't want any more requests during the Global Reset low time. */
+	mdelay(3);
 
 	return 0;
 }