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/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>
28
29 #include <linux/adb.h>
30
31 /*#define DEBUG_ADB_IOP*/
32
33 extern void iop_ism_irq(int, void *, struct pt_regs *);
34
35 static struct adb_request *current_req;
36 static struct adb_request *last_req;
37 #if 0
38 static unsigned char reply_buff[16];
39 static unsigned char *reply_ptr;
40 #endif
41
42 static enum adb_iop_state {
43 idle,
44 sending,
45 awaiting_reply
46 } adb_iop_state;
47
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);
56
57 struct adb_driver adb_iop_driver = {
58 "ISM IOP",
59 adb_iop_probe,
60 adb_iop_init,
61 adb_iop_send_request,
62 adb_iop_autopoll,
63 adb_iop_poll,
64 adb_iop_reset_bus
65 };
66
67 static void adb_iop_end_req(struct adb_request *req, int state)
68 {
69 req->complete = 1;
70 current_req = req->next;
71 if (req->done) (*req->done)(req);
72 adb_iop_state = state;
73 }
74
75 /*
76 * Completion routine for ADB commands sent to the IOP.
77 *
78 * This will be called when a packet has been successfully sent.
79 */
80
81 static void adb_iop_complete(struct iop_msg *msg, struct pt_regs *regs)
82 {
83 struct adb_request *req;
84 uint flags;
85
86 local_irq_save(flags);
87
88 req = current_req;
89 if ((adb_iop_state == sending) && req && req->reply_expected) {
90 adb_iop_state = awaiting_reply;
91 }
92
93 local_irq_restore(flags);
94 }
95
96 /*
97 * Listen for ADB messages from the IOP.
98 *
99 * This will be called when unsolicited messages (usually replies to TALK
100 * commands or autopoll packets) are received.
101 */
102
103 static void adb_iop_listen(struct iop_msg *msg, struct pt_regs *regs)
104 {
105 struct adb_iopmsg *amsg = (struct adb_iopmsg *) msg->message;
106 struct adb_request *req;
107 uint flags;
108 #ifdef DEBUG_ADB_IOP
109 int i;
110 #endif
111
112 local_irq_save(flags);
113
114 req = current_req;
115
116 #ifdef DEBUG_ADB_IOP
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]);
121 printk("\n");
122 #endif
123
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. */
129
130 if (amsg->flags & ADB_IOP_TIMEOUT) {
131 msg->reply[0] = ADB_IOP_TIMEOUT | ADB_IOP_AUTOPOLL;
132 msg->reply[1] = 0;
133 msg->reply[2] = 0;
134 if (req && (adb_iop_state != idle)) {
135 adb_iop_end_req(req, idle);
136 }
137 } else {
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);
145 } else {
146 adb_input(&amsg->cmd, amsg->count + 1, regs,
147 amsg->flags & ADB_IOP_AUTOPOLL);
148 }
149 memcpy(msg->reply, msg->message, IOP_MSG_LEN);
150 }
151 iop_complete_message(msg);
152 local_irq_restore(flags);
153 }
154
155 /*
156 * Start sending an ADB packet, IOP style
157 *
158 * There isn't much to do other than hand the packet over to the IOP
159 * after encapsulating it in an adb_iopmsg.
160 */
161
162 static void adb_iop_start(void)
163 {
164 unsigned long flags;
165 struct adb_request *req;
166 struct adb_iopmsg amsg;
167 #ifdef DEBUG_ADB_IOP
168 int i;
169 #endif
170
171 /* get the packet to send */
172 req = current_req;
173 if (!req) return;
174
175 local_irq_save(flags);
176
177 #ifdef DEBUG_ADB_IOP
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]);
181 printk("\n");
182 #endif
183
184 /* The IOP takes MacII-style packets, so */
185 /* strip the initial ADB_PACKET byte. */
186
187 amsg.flags = ADB_IOP_EXPLICIT;
188 amsg.count = req->nbytes - 2;
189
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);
193
194 req->sent = 1;
195 adb_iop_state = sending;
196 local_irq_restore(flags);
197
198 /* Now send it. The IOP manager will call adb_iop_complete */
199 /* when the packet has been sent. */
200
201 iop_send_message(ADB_IOP, ADB_CHAN, req,
202 sizeof(amsg), (__u8 *) &amsg, adb_iop_complete);
203 }
204
205 int adb_iop_probe(void)
206 {
207 if (!iop_ism_present) return -ENODEV;
208 return 0;
209 }
210
211 int adb_iop_init(void)
212 {
213 printk("adb: IOP ISM driver v0.4 for Unified ADB.\n");
214 iop_listen(ADB_IOP, ADB_CHAN, adb_iop_listen, "ADB");
215 return 0;
216 }
217
218 int adb_iop_send_request(struct adb_request *req, int sync)
219 {
220 int err;
221
222 err = adb_iop_write(req);
223 if (err) return err;
224
225 if (sync) {
226 while (!req->complete) adb_iop_poll();
227 }
228 return 0;
229 }
230
231 static int adb_iop_write(struct adb_request *req)
232 {
233 unsigned long flags;
234
235 if ((req->nbytes < 2) || (req->data[0] != ADB_PACKET)) {
236 req->complete = 1;
237 return -EINVAL;
238 }
239
240 local_irq_save(flags);
241
242 req->next = NULL;
243 req->sent = 0;
244 req->complete = 0;
245 req->reply_len = 0;
246
247 if (current_req != 0) {
248 last_req->next = req;
249 last_req = req;
250 } else {
251 current_req = req;
252 last_req = req;
253 }
254
255 local_irq_restore(flags);
256 if (adb_iop_state == idle) adb_iop_start();
257 return 0;
258 }
259
260 int adb_iop_autopoll(int devs)
261 {
262 /* TODO: how do we enable/disable autopoll? */
263 return 0;
264 }
265
266 void adb_iop_poll(void)
267 {
268 if (adb_iop_state == idle) adb_iop_start();
269 iop_ism_irq(0, (void *) ADB_IOP, NULL);
270 }
271
272 int adb_iop_reset_bus(void)
273 {
274 struct adb_request req = {
275 .reply_expected = 0,
276 .nbytes = 2,
277 .data = { ADB_PACKET, 0 },
278 };
279
280 adb_iop_write(&req);
281 while (!req.complete) {
282 adb_iop_poll();
283 schedule();
284 }
285
286 return 0;
287 }
288
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