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;
86 local_irq_save(flags);
89 if ((adb_iop_state == sending) && req && req->reply_expected) {
90 adb_iop_state = awaiting_reply;
93 local_irq_restore(flags);
97 * Listen for ADB messages from the IOP.
99 * This will be called when unsolicited messages (usually replies to TALK
100 * commands or autopoll packets) are received.
103 static void adb_iop_listen(struct iop_msg *msg, struct pt_regs *regs)
105 struct adb_iopmsg *amsg = (struct adb_iopmsg *) msg->message;
106 struct adb_request *req;
112 local_irq_save(flags);
117 printk("adb_iop_listen %p: rcvd packet, %d bytes: %02X %02X", req,
118 (uint) amsg->count + 2, (uint) amsg->flags, (uint) amsg->cmd);
119 for (i = 0; i < amsg->count; i++)
120 printk(" %02X", (uint) amsg->data[i]);
124 /* Handle a timeout. Timeout packets seem to occur even after */
125 /* we've gotten a valid reply to a TALK, so I'm assuming that */
126 /* a "timeout" is actually more like an "end-of-data" signal. */
127 /* We need to send back a timeout packet to the IOP to shut */
128 /* it up, plus complete the current request, if any. */
130 if (amsg->flags & ADB_IOP_TIMEOUT) {
131 msg->reply[0] = ADB_IOP_TIMEOUT | ADB_IOP_AUTOPOLL;
134 if (req && (adb_iop_state != idle)) {
135 adb_iop_end_req(req, idle);
138 /* TODO: is it possible for more than one chunk of data */
139 /* to arrive before the timeout? If so we need to */
140 /* use reply_ptr here like the other drivers do. */
141 if ((adb_iop_state == awaiting_reply) &&
142 (amsg->flags & ADB_IOP_EXPLICIT)) {
143 req->reply_len = amsg->count + 1;
144 memcpy(req->reply, &amsg->cmd, req->reply_len);
146 adb_input(&amsg->cmd, amsg->count + 1, regs,
147 amsg->flags & ADB_IOP_AUTOPOLL);
149 memcpy(msg->reply, msg->message, IOP_MSG_LEN);
151 iop_complete_message(msg);
152 local_irq_restore(flags);
156 * Start sending an ADB packet, IOP style
158 * There isn't much to do other than hand the packet over to the IOP
159 * after encapsulating it in an adb_iopmsg.
162 static void adb_iop_start(void)
165 struct adb_request *req;
166 struct adb_iopmsg amsg;
171 /* get the packet to send */
175 local_irq_save(flags);
178 printk("adb_iop_start %p: sending packet, %d bytes:", req, req->nbytes);
179 for (i = 0 ; i < req->nbytes ; i++)
180 printk(" %02X", (uint) req->data[i]);
184 /* The IOP takes MacII-style packets, so */
185 /* strip the initial ADB_PACKET byte. */
187 amsg.flags = ADB_IOP_EXPLICIT;
188 amsg.count = req->nbytes - 2;
190 /* amsg.data immediately follows amsg.cmd, effectively making */
191 /* amsg.cmd a pointer to the beginning of a full ADB packet. */
192 memcpy(&amsg.cmd, req->data + 1, req->nbytes - 1);
195 adb_iop_state = sending;
196 local_irq_restore(flags);
198 /* Now send it. The IOP manager will call adb_iop_complete */
199 /* when the packet has been sent. */
201 iop_send_message(ADB_IOP, ADB_CHAN, req,
202 sizeof(amsg), (__u8 *) &amsg, adb_iop_complete);
205 int adb_iop_probe(void)
207 if (!iop_ism_present) return -ENODEV;
211 int adb_iop_init(void)
213 printk("adb: IOP ISM driver v0.4 for Unified ADB.\n");
214 iop_listen(ADB_IOP, ADB_CHAN, adb_iop_listen, "ADB");
218 int adb_iop_send_request(struct adb_request *req, int sync)
222 err = adb_iop_write(req);
226 while (!req->complete) adb_iop_poll();
231 static int adb_iop_write(struct adb_request *req)
235 if ((req->nbytes < 2) || (req->data[0] != ADB_PACKET)) {
240 local_irq_save(flags);
247 if (current_req != 0) {
248 last_req->next = req;
255 local_irq_restore(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 = {
277 .data = { ADB_PACKET, 0 },
281 while (!req.complete) {