Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | |
Finn Thain | 47fd206 | 2018-09-11 20:18:44 -0400 | [diff] [blame] | 18 | #include <asm/macintosh.h> |
| 19 | #include <asm/macints.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <asm/mac_iop.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <asm/adb_iop.h> |
| 22 | |
Finn Thain | 47fd206 | 2018-09-11 20:18:44 -0400 | [diff] [blame] | 23 | #include <linux/adb.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | static struct adb_request *current_req; |
| 26 | static struct adb_request *last_req; |
Finn Thain | c66da95 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 27 | static unsigned int autopoll_devs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | static enum adb_iop_state { |
Finn Thain | 47fd206 | 2018-09-11 20:18:44 -0400 | [diff] [blame] | 30 | idle, |
| 31 | sending, |
| 32 | awaiting_reply |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | } adb_iop_state; |
| 34 | |
| 35 | static void adb_iop_start(void); |
| 36 | static int adb_iop_probe(void); |
| 37 | static int adb_iop_init(void); |
| 38 | static int adb_iop_send_request(struct adb_request *, int); |
| 39 | static int adb_iop_write(struct adb_request *); |
| 40 | static int adb_iop_autopoll(int); |
| 41 | static void adb_iop_poll(void); |
| 42 | static int adb_iop_reset_bus(void); |
| 43 | |
| 44 | struct adb_driver adb_iop_driver = { |
Finn Thain | 3a52f6f | 2018-03-29 11:36:04 +1100 | [diff] [blame] | 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 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | }; |
| 53 | |
Finn Thain | 32226e8 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 54 | static void adb_iop_done(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | { |
Finn Thain | 32226e8 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 56 | struct adb_request *req = current_req; |
| 57 | |
| 58 | adb_iop_state = idle; |
| 59 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | req->complete = 1; |
| 61 | current_req = req->next; |
Finn Thain | 47fd206 | 2018-09-11 20:18:44 -0400 | [diff] [blame] | 62 | if (req->done) |
| 63 | (*req->done)(req); |
Finn Thain | 32226e8 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 64 | |
| 65 | if (adb_iop_state == idle) |
| 66 | adb_iop_start(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 75 | static void adb_iop_complete(struct iop_msg *msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | { |
Geert Uytterhoeven | 38b7a2a | 2010-11-11 14:05:06 -0800 | [diff] [blame] | 77 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
| 79 | local_irq_save(flags); |
| 80 | |
Finn Thain | e2954e5 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 81 | if (current_req->reply_expected) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | adb_iop_state = awaiting_reply; |
Finn Thain | e2954e5 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 83 | else |
| 84 | adb_iop_done(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 96 | static void adb_iop_listen(struct iop_msg *msg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | { |
Finn Thain | 47fd206 | 2018-09-11 20:18:44 -0400 | [diff] [blame] | 98 | struct adb_iopmsg *amsg = (struct adb_iopmsg *)msg->message; |
Geert Uytterhoeven | 38b7a2a | 2010-11-11 14:05:06 -0800 | [diff] [blame] | 99 | unsigned long flags; |
Finn Thain | 32226e8 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 100 | bool req_done = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
| 102 | local_irq_save(flags); |
| 103 | |
Finn Thain | ff785e1 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 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 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | |
Finn Thain | 32226e8 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 109 | if (amsg->flags & ADB_IOP_EXPLICIT) { |
| 110 | if (adb_iop_state == awaiting_reply) { |
| 111 | struct adb_request *req = current_req; |
| 112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | req->reply_len = amsg->count + 1; |
| 114 | memcpy(req->reply, &amsg->cmd, req->reply_len); |
Finn Thain | 32226e8 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 115 | |
| 116 | req_done = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | } |
Finn Thain | 32226e8 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 118 | } else if (!(amsg->flags & ADB_IOP_TIMEOUT)) { |
| 119 | adb_input(&amsg->cmd, amsg->count + 1, |
| 120 | amsg->flags & ADB_IOP_AUTOPOLL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | } |
Finn Thain | 32226e8 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 122 | |
Finn Thain | c66da95 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 123 | msg->reply[0] = autopoll_devs ? ADB_IOP_AUTOPOLL : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | iop_complete_message(msg); |
Finn Thain | 32226e8 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 125 | |
| 126 | if (req_done) |
| 127 | adb_iop_done(); |
| 128 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 139 | static void adb_iop_start(void) |
| 140 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | struct adb_request *req; |
| 142 | struct adb_iopmsg amsg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
| 144 | /* get the packet to send */ |
| 145 | req = current_req; |
Finn Thain | 47fd206 | 2018-09-11 20:18:44 -0400 | [diff] [blame] | 146 | if (!req) |
| 147 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Finn Thain | ff785e1 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 149 | /* The IOP takes MacII-style packets, so strip the initial |
| 150 | * ADB_PACKET byte. |
| 151 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | amsg.flags = ADB_IOP_EXPLICIT; |
| 153 | amsg.count = req->nbytes - 2; |
| 154 | |
Finn Thain | ff785e1 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 155 | /* amsg.data immediately follows amsg.cmd, effectively making |
| 156 | * &amsg.cmd a pointer to the beginning of a full ADB packet. |
| 157 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | memcpy(&amsg.cmd, req->data + 1, req->nbytes - 1); |
| 159 | |
| 160 | req->sent = 1; |
| 161 | adb_iop_state = sending; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | |
Finn Thain | ff785e1 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 163 | /* Now send it. The IOP manager will call adb_iop_complete |
| 164 | * when the message has been sent. |
| 165 | */ |
Finn Thain | 47fd206 | 2018-09-11 20:18:44 -0400 | [diff] [blame] | 166 | iop_send_message(ADB_IOP, ADB_CHAN, req, sizeof(amsg), (__u8 *)&amsg, |
| 167 | adb_iop_complete); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | } |
| 169 | |
Finn Thain | 56b732e | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 170 | static int adb_iop_probe(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | { |
Finn Thain | 47fd206 | 2018-09-11 20:18:44 -0400 | [diff] [blame] | 172 | if (!iop_ism_present) |
| 173 | return -ENODEV; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | return 0; |
| 175 | } |
| 176 | |
Finn Thain | 56b732e | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 177 | static int adb_iop_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | { |
Finn Thain | 351e5ad | 2018-09-11 20:18:44 -0400 | [diff] [blame] | 179 | pr_info("adb: IOP ISM driver v0.4 for Unified ADB\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | iop_listen(ADB_IOP, ADB_CHAN, adb_iop_listen, "ADB"); |
| 181 | return 0; |
| 182 | } |
| 183 | |
Finn Thain | 56b732e | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 184 | static int adb_iop_send_request(struct adb_request *req, int sync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | { |
| 186 | int err; |
| 187 | |
| 188 | err = adb_iop_write(req); |
Finn Thain | 47fd206 | 2018-09-11 20:18:44 -0400 | [diff] [blame] | 189 | if (err) |
| 190 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
| 192 | if (sync) { |
Finn Thain | 47fd206 | 2018-09-11 20:18:44 -0400 | [diff] [blame] | 193 | while (!req->complete) |
| 194 | adb_iop_poll(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | } |
| 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | static 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 | |
Al Viro | a5d361f | 2006-01-12 01:06:34 -0800 | [diff] [blame] | 208 | req->next = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | req->sent = 0; |
| 210 | req->complete = 0; |
| 211 | req->reply_len = 0; |
| 212 | |
Finn Thain | aac840e | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 213 | local_irq_save(flags); |
| 214 | |
Finn Thain | 56b732e | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 215 | if (current_req) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | last_req->next = req; |
| 217 | last_req = req; |
| 218 | } else { |
| 219 | current_req = req; |
| 220 | last_req = req; |
| 221 | } |
| 222 | |
Finn Thain | 47fd206 | 2018-09-11 20:18:44 -0400 | [diff] [blame] | 223 | if (adb_iop_state == idle) |
| 224 | adb_iop_start(); |
Finn Thain | aac840e | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 225 | |
| 226 | local_irq_restore(flags); |
| 227 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | return 0; |
| 229 | } |
| 230 | |
Finn Thain | c66da95 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 231 | static 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 | |
Finn Thain | 56b732e | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 238 | static int adb_iop_autopoll(int devs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | { |
Finn Thain | c66da95 | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | return 0; |
| 258 | } |
| 259 | |
Finn Thain | 56b732e | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 260 | static void adb_iop_poll(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | { |
Finn Thain | 92178fc | 2017-10-26 22:45:24 -0400 | [diff] [blame] | 262 | iop_ism_irq_poll(ADB_IOP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | } |
| 264 | |
Finn Thain | 56b732e | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 265 | static int adb_iop_reset_bus(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | { |
Finn Thain | 303511e | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 267 | struct adb_request req; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
Finn Thain | 303511e | 2020-05-31 09:17:03 +1000 | [diff] [blame] | 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); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
| 276 | return 0; |
| 277 | } |