2 * I/O Processor (IOP) ADB Driver
3 * Written and (C) 1999 by Joshua M. Thompson (funaho@jurai.org)
4 * Based on via-cuda.c by Paul Mackerras.
6 * 1999-07-01 (jmt) - First implementation for new driver architecture.
8 * 1999-07-31 (jmt) - First working version.
12 * o Implement SRQ handling.
15 #include <linux/types.h>
16 #include <linux/kernel.h>
18 #include <linux/delay.h>
19 #include <linux/init.h>
20 #include <linux/proc_fs.h>
22 #include <asm/bootinfo.h>
23 #include <asm/macintosh.h>
24 #include <asm/macints.h>
25 #include <asm/mac_iop.h>
26 #include <asm/mac_oss.h>
27 #include <asm/adb_iop.h>
29 #include <linux/adb.h>
31 /*#define DEBUG_ADB_IOP*/
33 extern void iop_ism_irq(int, void *, struct pt_regs
*);
35 static struct adb_request
*current_req
;
36 static struct adb_request
*last_req
;
38 static unsigned char reply_buff
[16];
39 static unsigned char *reply_ptr
;
42 static enum adb_iop_state
{
48 static void adb_iop_start(void);
49 static int adb_iop_probe(void);
50 static int adb_iop_init(void);
51 static int adb_iop_send_request(struct adb_request
*, int);
52 static int adb_iop_write(struct adb_request
*);
53 static int adb_iop_autopoll(int);
54 static void adb_iop_poll(void);
55 static int adb_iop_reset_bus(void);
57 struct adb_driver adb_iop_driver
= {
67 static void adb_iop_end_req(struct adb_request
*req
, int state
)
70 current_req
= req
->next
;
71 if (req
->done
) (*req
->done
)(req
);
72 adb_iop_state
= state
;
76 * Completion routine for ADB commands sent to the IOP.
78 * This will be called when a packet has been successfully sent.
81 static void adb_iop_complete(struct iop_msg
*msg
, struct pt_regs
*regs
)
83 struct adb_request
*req
;
90 if ((adb_iop_state
== sending
) && req
&& req
->reply_expected
) {
91 adb_iop_state
= awaiting_reply
;
98 * Listen for ADB messages from the IOP.
100 * This will be called when unsolicited messages (usually replies to TALK
101 * commands or autopoll packets) are received.
104 static void adb_iop_listen(struct iop_msg
*msg
, struct pt_regs
*regs
)
106 struct adb_iopmsg
*amsg
= (struct adb_iopmsg
*) msg
->message
;
107 struct adb_request
*req
;
116 printk("adb_iop_listen: rcvd packet, %d bytes: %02X %02X",
117 (uint
) amsg
->count
+ 2, (uint
) amsg
->flags
, (uint
) amsg
->cmd
);
119 while (i
< amsg
->count
) {
120 printk(" %02X", (uint
) amsg
->data
[i
++]);
125 /* Handle a timeout. Timeout packets seem to occur even after */
126 /* we've gotten a valid reply to a TALK, so I'm assuming that */
127 /* a "timeout" is actually more like an "end-of-data" signal. */
128 /* We need to send back a timeout packet to the IOP to shut */
129 /* it up, plus complete the current request, if any. */
131 if (amsg
->flags
& ADB_IOP_TIMEOUT
) {
132 msg
->reply
[0] = ADB_IOP_TIMEOUT
| ADB_IOP_AUTOPOLL
;
135 if (req
&& (adb_iop_state
!= idle
)) {
136 adb_iop_end_req(req
, idle
);
139 /* TODO: is it possible for more tha one chunk of data */
140 /* to arrive before the timeout? If so we need to */
141 /* use reply_ptr here like the other drivers do. */
142 if ((adb_iop_state
== awaiting_reply
) &&
143 (amsg
->flags
& ADB_IOP_EXPLICIT
)) {
144 req
->reply_len
= amsg
->count
+ 1;
145 memcpy(req
->reply
, &amsg
->cmd
, req
->reply_len
);
147 adb_input(&amsg
->cmd
, amsg
->count
+ 1, regs
,
148 amsg
->flags
& ADB_IOP_AUTOPOLL
);
150 memcpy(msg
->reply
, msg
->message
, IOP_MSG_LEN
);
152 iop_complete_message(msg
);
153 restore_flags(flags
);
157 * Start sending an ADB packet, IOP style
159 * There isn't much to do other than hand the packet over to the IOP
160 * after encapsulating it in an adb_iopmsg.
163 static void adb_iop_start(void)
166 struct adb_request
*req
;
167 struct adb_iopmsg amsg
;
169 /* get the packet to send */
177 printk("adb_iop_start: sending packet, %d bytes:", req
->nbytes
);
178 for (i
= 0 ; i
< req
->nbytes
; i
++)
179 printk(" %02X", (uint
) req
->data
[i
]);
183 /* The IOP takes MacII-style packets, so */
184 /* strip the initial ADB_PACKET byte. */
186 amsg
.flags
= ADB_IOP_EXPLICIT
;
187 amsg
.count
= req
->nbytes
- 2;
189 /* amsg.data immediately follows amsg.cmd, effectively making */
190 /* amsg.cmd a pointer to the beginning of a full ADB packet. */
191 memcpy(&amsg
.cmd
, req
->data
+ 1, req
->nbytes
- 1);
194 adb_iop_state
= sending
;
195 restore_flags(flags
);
197 /* Now send it. The IOP manager will call adb_iop_complete */
198 /* when the packet has been sent. */
200 iop_send_message(ADB_IOP
, ADB_CHAN
, req
,
201 sizeof(amsg
), (__u8
*) &amsg
, adb_iop_complete
);
204 int adb_iop_probe(void)
206 if (!iop_ism_present
) return -ENODEV
;
210 int adb_iop_init(void)
212 printk("adb: IOP ISM driver v0.4 for Unified ADB.\n");
213 iop_listen(ADB_IOP
, ADB_CHAN
, adb_iop_listen
, "ADB");
217 int adb_iop_send_request(struct adb_request
*req
, int sync
)
221 err
= adb_iop_write(req
);
225 while (!req
->complete
) adb_iop_poll();
230 static int adb_iop_write(struct adb_request
*req
)
234 if ((req
->nbytes
< 2) || (req
->data
[0] != ADB_PACKET
)) {
247 if (current_req
!= 0) {
248 last_req
->next
= req
;
255 restore_flags(flags
);
256 if (adb_iop_state
== idle
) adb_iop_start();
260 int adb_iop_autopoll(int devs
)
262 /* TODO: how do we enable/disable autopoll? */
266 void adb_iop_poll(void)
268 if (adb_iop_state
== idle
) adb_iop_start();
269 iop_ism_irq(0, (void *) ADB_IOP
, NULL
);
272 int adb_iop_reset_bus(void)
274 struct adb_request req
;
276 req
.reply_expected
= 0;
278 req
.data
[0] = ADB_PACKET
;
279 req
.data
[1] = 0; /* RESET */
281 while (!req
.complete
) adb_iop_poll();