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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * I/O Processor (IOP) ADB Driver
4 * Written and (C) 1999 by Joshua M. Thompson (funaho@jurai.org)
5 * Based on via-cuda.c by Paul Mackerras.
6 *
7 * 1999-07-01 (jmt) - First implementation for new driver architecture.
8 *
9 * 1999-07-31 (jmt) - First working version.
10 *
11 * TODO:
12 *
13 * o Implement SRQ handling.
14 */
15
16#include <linux/types.h>
17#include <linux/kernel.h>
18#include <linux/mm.h>
19#include <linux/delay.h>
20#include <linux/init.h>
21#include <linux/proc_fs.h>
22
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
33static struct adb_request *current_req;
34static struct adb_request *last_req;
35#if 0
36static unsigned char reply_buff[16];
37static unsigned char *reply_ptr;
38#endif
39
40static enum adb_iop_state {
41 idle,
42 sending,
43 awaiting_reply
44} adb_iop_state;
45
46static void adb_iop_start(void);
47static int adb_iop_probe(void);
48static int adb_iop_init(void);
49static int adb_iop_send_request(struct adb_request *, int);
50static int adb_iop_write(struct adb_request *);
51static int adb_iop_autopoll(int);
52static void adb_iop_poll(void);
53static int adb_iop_reset_bus(void);
54
55struct adb_driver adb_iop_driver = {
56 .name = "ISM IOP",
57 .probe = adb_iop_probe,
58 .init = adb_iop_init,
59 .send_request = adb_iop_send_request,
60 .autopoll = adb_iop_autopoll,
61 .poll = adb_iop_poll,
62 .reset_bus = adb_iop_reset_bus
63};
64
65static void adb_iop_end_req(struct adb_request *req, int state)
66{
67 req->complete = 1;
68 current_req = req->next;
69 if (req->done)
70 (*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
80static void adb_iop_complete(struct iop_msg *msg)
81{
82 struct adb_request *req;
83 unsigned long 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
102static 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 unsigned long 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
161static 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)
173 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, sizeof(amsg), (__u8 *)&amsg,
202 adb_iop_complete);
203}
204
205int adb_iop_probe(void)
206{
207 if (!iop_ism_present)
208 return -ENODEV;
209 return 0;
210}
211
212int adb_iop_init(void)
213{
214 pr_info("adb: IOP ISM driver v0.4 for Unified ADB\n");
215 iop_listen(ADB_IOP, ADB_CHAN, adb_iop_listen, "ADB");
216 return 0;
217}
218
219int adb_iop_send_request(struct adb_request *req, int sync)
220{
221 int err;
222
223 err = adb_iop_write(req);
224 if (err)
225 return err;
226
227 if (sync) {
228 while (!req->complete)
229 adb_iop_poll();
230 }
231 return 0;
232}
233
234static int adb_iop_write(struct adb_request *req)
235{
236 unsigned long flags;
237
238 if ((req->nbytes < 2) || (req->data[0] != ADB_PACKET)) {
239 req->complete = 1;
240 return -EINVAL;
241 }
242
243 local_irq_save(flags);
244
245 req->next = NULL;
246 req->sent = 0;
247 req->complete = 0;
248 req->reply_len = 0;
249
250 if (current_req != 0) {
251 last_req->next = req;
252 last_req = req;
253 } else {
254 current_req = req;
255 last_req = req;
256 }
257
258 local_irq_restore(flags);
259
260 if (adb_iop_state == idle)
261 adb_iop_start();
262 return 0;
263}
264
265int adb_iop_autopoll(int devs)
266{
267 /* TODO: how do we enable/disable autopoll? */
268 return 0;
269}
270
271void adb_iop_poll(void)
272{
273 if (adb_iop_state == idle)
274 adb_iop_start();
275 iop_ism_irq_poll(ADB_IOP);
276}
277
278int adb_iop_reset_bus(void)
279{
280 struct adb_request req = {
281 .reply_expected = 0,
282 .nbytes = 2,
283 .data = { ADB_PACKET, 0 },
284 };
285
286 adb_iop_write(&req);
287 while (!req.complete) {
288 adb_iop_poll();
289 schedule();
290 }
291
292 return 0;
293}
294

Warning: That file was not part of the compilation database. It may have many parsing errors.