1 /*
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.
5 *
6 * 1999-07-01 (jmt) - First implementation for new driver architecture.
7 *
8 * 1999-07-31 (jmt) - First working version.
9 *
10 * TODO:
11 *
12 * o Implement SRQ handling.
13 */
14
15 #include <linux/types.h>
16 #include <linux/kernel.h>
17 #include <linux/mm.h>
18 #include <linux/delay.h>
19 #include <linux/init.h>
20 #include <linux/proc_fs.h>
21
22 #include <asm/macintosh.h>
23 #include <asm/macints.h>
24 #include <asm/mac_iop.h>
25 #include <asm/mac_oss.h>
26 #include <asm/adb_iop.h>
27
28 #include <linux/adb.h>
29
30 /*#define DEBUG_ADB_IOP*/
31
32 extern void iop_ism_irq(int, void *);
33
34 static struct adb_request *current_req;
35 static struct adb_request *last_req;
36 #if 0
37 static unsigned char reply_buff[16];
38 static unsigned char *reply_ptr;
39 #endif
40
41 static enum adb_iop_state {
42 idle,
43 sending,
44 awaiting_reply
45 } adb_iop_state;
46
47 static void adb_iop_start(void);
48 static int adb_iop_probe(void);
49 static int adb_iop_init(void);
50 static int adb_iop_send_request(struct adb_request *, int);
51 static int adb_iop_write(struct adb_request *);
52 static int adb_iop_autopoll(int);
53 static void adb_iop_poll(void);
54 static int adb_iop_reset_bus(void);
55
56 struct adb_driver adb_iop_driver = {
57 "ISM IOP",
58 adb_iop_probe,
59 adb_iop_init,
60 adb_iop_send_request,
61 adb_iop_autopoll,
62 adb_iop_poll,
63 adb_iop_reset_bus
64 };
65
66 static void adb_iop_end_req(struct adb_request *req, int state)
67 {
68 req->complete = 1;
69 current_req = req->next;
70 if (req->done) (*req->done)(req);
71 adb_iop_state = state;
72 }
73
74 /*
75 * Completion routine for ADB commands sent to the IOP.
76 *
77 * This will be called when a packet has been successfully sent.
78 */
79
80 static void adb_iop_complete(struct iop_msg *msg)
81 {
82 struct adb_request *req;
83 uint flags;
84
85 local_irq_save(flags);
86
87 req = current_req;
88 if ((adb_iop_state == sending) && req && req->reply_expected) {
89 adb_iop_state = awaiting_reply;
90 }
91
92 local_irq_restore(flags);
93 }
94
95 /*
96 * Listen for ADB messages from the IOP.
97 *
98 * This will be called when unsolicited messages (usually replies to TALK
99 * commands or autopoll packets) are received.
100 */
101
102 static void adb_iop_listen(struct iop_msg *msg)
103 {
104 struct adb_iopmsg *amsg = (struct adb_iopmsg *) msg->message;
105 struct adb_request *req;
106 uint flags;
107 #ifdef DEBUG_ADB_IOP
108 int i;
109 #endif
110
111 local_irq_save(flags);
112
113 req = current_req;
114
115 #ifdef DEBUG_ADB_IOP
116 printk("adb_iop_listen %p: rcvd packet, %d bytes: %02X %02X", req,
117 (uint) amsg->count + 2, (uint) amsg->flags, (uint) amsg->cmd);
118 for (i = 0; i < amsg->count; i++)
119 printk(" %02X", (uint) amsg->data[i]);
120 printk("\n");
121 #endif
122
123 /* Handle a timeout. Timeout packets seem to occur even after */
124 /* we've gotten a valid reply to a TALK, so I'm assuming that */
125 /* a "timeout" is actually more like an "end-of-data" signal. */
126 /* We need to send back a timeout packet to the IOP to shut */
127 /* it up, plus complete the current request, if any. */
128
129 if (amsg->flags & ADB_IOP_TIMEOUT) {
130 msg->reply[0] = ADB_IOP_TIMEOUT | ADB_IOP_AUTOPOLL;
131 msg->reply[1] = 0;
132 msg->reply[2] = 0;
133 if (req && (adb_iop_state != idle)) {
134 adb_iop_end_req(req, idle);
135 }
136 } else {
137 /* TODO: is it possible for more than one chunk of data */
138 /* to arrive before the timeout? If so we need to */
139 /* use reply_ptr here like the other drivers do. */
140 if ((adb_iop_state == awaiting_reply) &&
141 (amsg->flags & ADB_IOP_EXPLICIT)) {
142 req->reply_len = amsg->count + 1;
143 memcpy(req->reply, &amsg->cmd, req->reply_len);
144 } else {
145 adb_input(&amsg->cmd, amsg->count + 1,
146 amsg->flags & ADB_IOP_AUTOPOLL);
147 }
148 memcpy(msg->reply, msg->message, IOP_MSG_LEN);
149 }
150 iop_complete_message(msg);
151 local_irq_restore(flags);
152 }
153
154 /*
155 * Start sending an ADB packet, IOP style
156 *
157 * There isn't much to do other than hand the packet over to the IOP
158 * after encapsulating it in an adb_iopmsg.
159 */
160
161 static void adb_iop_start(void)
162 {
163 unsigned long flags;
164 struct adb_request *req;
165 struct adb_iopmsg amsg;
166 #ifdef DEBUG_ADB_IOP
167 int i;
168 #endif
169
170 /* get the packet to send */
171 req = current_req;
172 if (!req) return;
173
174 local_irq_save(flags);
175
176 #ifdef DEBUG_ADB_IOP
177 printk("adb_iop_start %p: sending packet, %d bytes:", req, req->nbytes);
178 for (i = 0 ; i < req->nbytes ; i++)
179 printk(" %02X", (uint) req->data[i]);
180 printk("\n");
181 #endif
182
183 /* The IOP takes MacII-style packets, so */
184 /* strip the initial ADB_PACKET byte. */
185
186 amsg.flags = ADB_IOP_EXPLICIT;
187 amsg.count = req->nbytes - 2;
188
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);
192
193 req->sent = 1;
194 adb_iop_state = sending;
195 local_irq_restore(flags);
196
197 /* Now send it. The IOP manager will call adb_iop_complete */
198 /* when the packet has been sent. */
199
200 iop_send_message(ADB_IOP, ADB_CHAN, req,
201 sizeof(amsg), (__u8 *) &amsg, adb_iop_complete);
202 }
203
204 int adb_iop_probe(void)
205 {
206 if (!iop_ism_present) return -ENODEV;
207 return 0;
208 }
209
210 int adb_iop_init(void)
211 {
212 printk("adb: IOP ISM driver v0.4 for Unified ADB.\n");
213 iop_listen(ADB_IOP, ADB_CHAN, adb_iop_listen, "ADB");
214 return 0;
215 }
216
217 int adb_iop_send_request(struct adb_request *req, int sync)
218 {
219 int err;
220
221 err = adb_iop_write(req);
222 if (err) return err;
223
224 if (sync) {
225 while (!req->complete) adb_iop_poll();
226 }
227 return 0;
228 }
229
230 static int adb_iop_write(struct adb_request *req)
231 {
232 unsigned long flags;
233
234 if ((req->nbytes < 2) || (req->data[0] != ADB_PACKET)) {
235 req->complete = 1;
236 return -EINVAL;
237 }
238
239 local_irq_save(flags);
240
241 req->next = NULL;
242 req->sent = 0;
243 req->complete = 0;
244 req->reply_len = 0;
245
246 if (current_req != 0) {
247 last_req->next = req;
248 last_req = req;
249 } else {
250 current_req = req;
251 last_req = req;
252 }
253
254 local_irq_restore(flags);
255 if (adb_iop_state == idle) adb_iop_start();
256 return 0;
257 }
258
259 int adb_iop_autopoll(int devs)
260 {
261 /* TODO: how do we enable/disable autopoll? */
262 return 0;
263 }
264
265 void adb_iop_poll(void)
266 {
267 if (adb_iop_state == idle) adb_iop_start();
268 iop_ism_irq(0, (void *) ADB_IOP);
269 }
270
271 int adb_iop_reset_bus(void)
272 {
273 struct adb_request req = {
274 .reply_expected = 0,
275 .nbytes = 2,
276 .data = { ADB_PACKET, 0 },
277 };
278
279 adb_iop_write(&req);
280 while (!req.complete) {
281 adb_iop_poll();
282 schedule();
283 }
284
285 return 0;
286 }
287
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