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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
12#include <linux/types.h>
13#include <linux/kernel.h>
14#include <linux/mm.h>
15#include <linux/delay.h>
16#include <linux/init.h>
17
18#include <asm/macintosh.h>
19#include <asm/macints.h>
20#include <asm/mac_iop.h>
21#include <asm/adb_iop.h>
22
23#include <linux/adb.h>
24
25static struct adb_request *current_req;
26static struct adb_request *last_req;
27static unsigned int autopoll_devs;
28
29static enum adb_iop_state {
30 idle,
31 sending,
32 awaiting_reply
33} adb_iop_state;
34
35static void adb_iop_start(void);
36static int adb_iop_probe(void);
37static int adb_iop_init(void);
38static int adb_iop_send_request(struct adb_request *, int);
39static int adb_iop_write(struct adb_request *);
40static int adb_iop_autopoll(int);
41static void adb_iop_poll(void);
42static int adb_iop_reset_bus(void);
43
44struct adb_driver adb_iop_driver = {
45 .name = "ISM IOP",
46 .probe = adb_iop_probe,
47 .init = adb_iop_init,
48 .send_request = adb_iop_send_request,
49 .autopoll = adb_iop_autopoll,
50 .poll = adb_iop_poll,
51 .reset_bus = adb_iop_reset_bus
52};
53
54static void adb_iop_done(void)
55{
56 struct adb_request *req = current_req;
57
58 adb_iop_state = idle;
59
60 req->complete = 1;
61 current_req = req->next;
62 if (req->done)
63 (*req->done)(req);
64
65 if (adb_iop_state == idle)
66 adb_iop_start();
67}
68
69/*
70 * Completion routine for ADB commands sent to the IOP.
71 *
72 * This will be called when a packet has been successfully sent.
73 */
74
75static void adb_iop_complete(struct iop_msg *msg)
76{
77 unsigned long flags;
78
79 local_irq_save(flags);
80
81 if (current_req->reply_expected)
82 adb_iop_state = awaiting_reply;
83 else
84 adb_iop_done();
85
86 local_irq_restore(flags);
87}
88
89/*
90 * Listen for ADB messages from the IOP.
91 *
92 * This will be called when unsolicited messages (usually replies to TALK
93 * commands or autopoll packets) are received.
94 */
95
96static void adb_iop_listen(struct iop_msg *msg)
97{
98 struct adb_iopmsg *amsg = (struct adb_iopmsg *)msg->message;
99 unsigned long flags;
100 bool req_done = false;
101
102 local_irq_save(flags);
103
104 /* Handle a timeout. Timeout packets seem to occur even after
105 * we've gotten a valid reply to a TALK, presumably because of
106 * autopolling.
107 */
108
109 if (amsg->flags & ADB_IOP_EXPLICIT) {
110 if (adb_iop_state == awaiting_reply) {
111 struct adb_request *req = current_req;
112
113 req->reply_len = amsg->count + 1;
114 memcpy(req->reply, &amsg->cmd, req->reply_len);
115
116 req_done = true;
117 }
118 } else if (!(amsg->flags & ADB_IOP_TIMEOUT)) {
119 adb_input(&amsg->cmd, amsg->count + 1,
120 amsg->flags & ADB_IOP_AUTOPOLL);
121 }
122
123 msg->reply[0] = autopoll_devs ? ADB_IOP_AUTOPOLL : 0;
124 iop_complete_message(msg);
125
126 if (req_done)
127 adb_iop_done();
128
129 local_irq_restore(flags);
130}
131
132/*
133 * Start sending an ADB packet, IOP style
134 *
135 * There isn't much to do other than hand the packet over to the IOP
136 * after encapsulating it in an adb_iopmsg.
137 */
138
139static void adb_iop_start(void)
140{
141 struct adb_request *req;
142 struct adb_iopmsg amsg;
143
144 /* get the packet to send */
145 req = current_req;
146 if (!req)
147 return;
148
149 /* The IOP takes MacII-style packets, so strip the initial
150 * ADB_PACKET byte.
151 */
152 amsg.flags = ADB_IOP_EXPLICIT;
153 amsg.count = req->nbytes - 2;
154
155 /* amsg.data immediately follows amsg.cmd, effectively making
156 * &amsg.cmd a pointer to the beginning of a full ADB packet.
157 */
158 memcpy(&amsg.cmd, req->data + 1, req->nbytes - 1);
159
160 req->sent = 1;
161 adb_iop_state = sending;
162
163 /* Now send it. The IOP manager will call adb_iop_complete
164 * when the message has been sent.
165 */
166 iop_send_message(ADB_IOP, ADB_CHAN, req, sizeof(amsg), (__u8 *)&amsg,
167 adb_iop_complete);
168}
169
170static int adb_iop_probe(void)
171{
172 if (!iop_ism_present)
173 return -ENODEV;
174 return 0;
175}
176
177static int adb_iop_init(void)
178{
179 pr_info("adb: IOP ISM driver v0.4 for Unified ADB\n");
180 iop_listen(ADB_IOP, ADB_CHAN, adb_iop_listen, "ADB");
181 return 0;
182}
183
184static int adb_iop_send_request(struct adb_request *req, int sync)
185{
186 int err;
187
188 err = adb_iop_write(req);
189 if (err)
190 return err;
191
192 if (sync) {
193 while (!req->complete)
194 adb_iop_poll();
195 }
196 return 0;
197}
198
199static int adb_iop_write(struct adb_request *req)
200{
201 unsigned long flags;
202
203 if ((req->nbytes < 2) || (req->data[0] != ADB_PACKET)) {
204 req->complete = 1;
205 return -EINVAL;
206 }
207
208 req->next = NULL;
209 req->sent = 0;
210 req->complete = 0;
211 req->reply_len = 0;
212
213 local_irq_save(flags);
214
215 if (current_req) {
216 last_req->next = req;
217 last_req = req;
218 } else {
219 current_req = req;
220 last_req = req;
221 }
222
223 if (adb_iop_state == idle)
224 adb_iop_start();
225
226 local_irq_restore(flags);
227
228 return 0;
229}
230
231static void adb_iop_set_ap_complete(struct iop_msg *msg)
232{
233 struct adb_iopmsg *amsg = (struct adb_iopmsg *)msg->message;
234
235 autopoll_devs = (amsg->data[1] << 8) | amsg->data[0];
236}
237
238static int adb_iop_autopoll(int devs)
239{
240 struct adb_iopmsg amsg;
241 unsigned long flags;
242 unsigned int mask = (unsigned int)devs & 0xFFFE;
243
244 local_irq_save(flags);
245
246 amsg.flags = ADB_IOP_SET_AUTOPOLL | (mask ? ADB_IOP_AUTOPOLL : 0);
247 amsg.count = 2;
248 amsg.cmd = 0;
249 amsg.data[0] = mask & 0xFF;
250 amsg.data[1] = (mask >> 8) & 0xFF;
251
252 iop_send_message(ADB_IOP, ADB_CHAN, NULL, sizeof(amsg), (__u8 *)&amsg,
253 adb_iop_set_ap_complete);
254
255 local_irq_restore(flags);
256
257 return 0;
258}
259
260static void adb_iop_poll(void)
261{
262 iop_ism_irq_poll(ADB_IOP);
263}
264
265static int adb_iop_reset_bus(void)
266{
267 struct adb_request req;
268
269 /* Command = 0, Address = ignored */
270 adb_request(&req, NULL, ADBREQ_NOSEND, 1, ADB_BUSRESET);
271 adb_iop_send_request(&req, 1);
272
273 /* Don't want any more requests during the Global Reset low time. */
274 mdelay(3);
275
276 return 0;
277}
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
32extern void iop_ism_irq(int, void *);
33
34static struct adb_request *current_req;
35static struct adb_request *last_req;
36#if 0
37static unsigned char reply_buff[16];
38static unsigned char *reply_ptr;
39#endif
40
41static enum adb_iop_state {
42 idle,
43 sending,
44 awaiting_reply
45} adb_iop_state;
46
47static void adb_iop_start(void);
48static int adb_iop_probe(void);
49static int adb_iop_init(void);
50static int adb_iop_send_request(struct adb_request *, int);
51static int adb_iop_write(struct adb_request *);
52static int adb_iop_autopoll(int);
53static void adb_iop_poll(void);
54static int adb_iop_reset_bus(void);
55
56struct 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
66static 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
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) 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
204int adb_iop_probe(void)
205{
206 if (!iop_ism_present) return -ENODEV;
207 return 0;
208}
209
210int 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
217int 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
230static 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
259int adb_iop_autopoll(int devs)
260{
261 /* TODO: how do we enable/disable autopoll? */
262 return 0;
263}
264
265void adb_iop_poll(void)
266{
267 if (adb_iop_state == idle) adb_iop_start();
268 iop_ism_irq(0, (void *) ADB_IOP);
269}
270
271int 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}