root/arch/m68k/mac/iop.c

DEFINITIONS

1. iop_loadaddr
2. iop_readb
3. iop_writeb
4. iop_stop
5. iop_start
6. iop_bypass
7. iop_interrupt
8. iop_alive
9. iop_get_unused_msg
10. iop_preinit
11. iop_init
12. iop_register_interrupts
13. iop_listen
14. iop_complete_message
15. iop_do_send
16. iop_handle_send
17. iop_handle_recv
18. iop_send_message
19. iop_upload_code
20. iop_download_code
21. iop_compare_code
22. iop_ism_irq
23. iop_ism_irq_poll

   1 /*
   2  * I/O Processor (IOP) management
   3  * Written and (C) 1999 by Joshua M. Thompson (funaho@jurai.org)
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice and this list of conditions.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice and this list of conditions in the documentation and/or other
  12  *    materials provided with the distribution.
  13  */
  14 
  15 /*
  16  * The IOP chips are used in the IIfx and some Quadras (900, 950) to manage
  17  * serial and ADB. They are actually a 6502 processor and some glue logic.
  18  *
  19  * 990429 (jmt) - Initial implementation, just enough to knock the SCC IOP
  20  *                into compatible mode so nobody has to fiddle with the
  21  *                Serial Switch control panel anymore.
  22  * 990603 (jmt) - Added code to grab the correct ISM IOP interrupt for OSS
  23  *                and non-OSS machines (at least I hope it's correct on a
  24  *                non-OSS machine -- someone with a Q900 or Q950 needs to
  25  *                check this.)
  26  * 990605 (jmt) - Rearranged things a bit wrt IOP detection; iop_present is
  27  *                gone, IOP base addresses are now in an array and the
  28  *                globally-visible functions take an IOP number instead of an
  29  *                an actual base address.
  30  * 990610 (jmt) - Finished the message passing framework and it seems to work.
  31  *                Sending _definitely_ works; my adb-bus.c mods can send
  32  *                messages and receive the MSG_COMPLETED status back from the
  33  *                IOP. The trick now is figuring out the message formats.
  34  * 990611 (jmt) - More cleanups. Fixed problem where unclaimed messages on a
  35  *                receive channel were never properly acknowledged. Bracketed
  36  *                the remaining debug printk's with #ifdef's and disabled
  37  *                debugging. I can now type on the console.
  38  * 990612 (jmt) - Copyright notice added. Reworked the way replies are handled.
  39  *                It turns out that replies are placed back in the send buffer
  40  *                for that channel; messages on the receive channels are always
  41  *                unsolicited messages from the IOP (and our replies to them
  42  *                should go back in the receive channel.) Also added tracking
  43  *                of device names to the listener functions ala the interrupt
  44  *                handlers.
  45  * 990729 (jmt) - Added passing of pt_regs structure to IOP handlers. This is
  46  *                used by the new unified ADB driver.
  47  *
  48  * TODO:
  49  *
  50  * o Something should be periodically checking iop_alive() to make sure the
  51  *   IOP hasn't died.
  52  * o Some of the IOP manager routines need better error checking and
  53  *   return codes. Nothing major, just prettying up.
  54  */
  55 
  56 /*
  57  * -----------------------
  58  * IOP Message Passing 101
  59  * -----------------------
  60  *
  61  * The host talks to the IOPs using a rather simple message-passing scheme via
  62  * a shared memory area in the IOP RAM. Each IOP has seven "channels"; each
  63  * channel is connected to a specific software driver on the IOP. For example
  64  * on the SCC IOP there is one channel for each serial port. Each channel has
  65  * an incoming and and outgoing message queue with a depth of one.
  66  *
  67  * A message is 32 bytes plus a state byte for the channel (MSG_IDLE, MSG_NEW,
  68  * MSG_RCVD, MSG_COMPLETE). To send a message you copy the message into the
  69  * buffer, set the state to MSG_NEW and signal the IOP by setting the IRQ flag
  70  * in the IOP control to 1. The IOP will move the state to MSG_RCVD when it
  71  * receives the message and then to MSG_COMPLETE when the message processing
  72  * has completed. It is the host's responsibility at that point to read the
  73  * reply back out of the send channel buffer and reset the channel state back
  74  * to MSG_IDLE.
  75  *
  76  * To receive message from the IOP the same procedure is used except the roles
  77  * are reversed. That is, the IOP puts message in the channel with a state of
  78  * MSG_NEW, and the host receives the message and move its state to MSG_RCVD
  79  * and then to MSG_COMPLETE when processing is completed and the reply (if any)
  80  * has been placed back in the receive channel. The IOP will then reset the
  81  * channel state to MSG_IDLE.
  82  *
  83  * Two sets of host interrupts are provided, INT0 and INT1. Both appear on one
  84  * interrupt level; they are distinguished by a pair of bits in the IOP status
  85  * register. The IOP will raise INT0 when one or more messages in the send
  86  * channels have gone to the MSG_COMPLETE state and it will raise INT1 when one
  87  * or more messages on the receive channels have gone to the MSG_NEW state.
  88  *
  89  * Since each channel handles only one message we have to implement a small
  90  * interrupt-driven queue on our end. Messages to be sent are placed on the
  91  * queue for sending and contain a pointer to an optional callback function.
  92  * The handler for a message is called when the message state goes to
  93  * MSG_COMPLETE.
  94  *
  95  * For receiving message we maintain a list of handler functions to call when
  96  * a message is received on that IOP/channel combination. The handlers are
  97  * called much like an interrupt handler and are passed a copy of the message
  98  * from the IOP. The message state will be in MSG_RCVD while the handler runs;
  99  * it is the handler's responsibility to call iop_complete_message() when
 100  * finished; this function moves the message state to MSG_COMPLETE and signals
 101  * the IOP. This two-step process is provided to allow the handler to defer
 102  * message processing to a bottom-half handler if the processing will take
 103  * a significant amount of time (handlers are called at interrupt time so they
 104  * should execute quickly.)
 105  */
 106 
 107 #include <linux/types.h>
 108 #include <linux/kernel.h>
 109 #include <linux/mm.h>
 110 #include <linux/delay.h>
 111 #include <linux/init.h>
 112 #include <linux/interrupt.h>
 113 
 114 #include <asm/macintosh.h>
 115 #include <asm/macints.h>
 116 #include <asm/mac_iop.h>
 117 
 118 #ifdef DEBUG
 119 #define iop_pr_debug(fmt, ...) \
 120         printk(KERN_DEBUG "%s: " fmt, __func__, ##__VA_ARGS__)
 121 #define iop_pr_cont(fmt, ...) \
 122         printk(KERN_CONT fmt, ##__VA_ARGS__)
 123 #else
 124 #define iop_pr_debug(fmt, ...) \
 125         no_printk(KERN_DEBUG "%s: " fmt, __func__, ##__VA_ARGS__)
 126 #define iop_pr_cont(fmt, ...) \
 127         no_printk(KERN_CONT fmt, ##__VA_ARGS__)
 128 #endif
 129 
 130 /* Non-zero if the IOPs are present */
 131 
 132 int iop_scc_present, iop_ism_present;
 133 
 134 /* structure for tracking channel listeners */
 135 
 136 struct listener {
 137         const char *devname;
 138         void (*handler)(struct iop_msg *);
 139 };
 140 
 141 /*
 142  * IOP structures for the two IOPs
 143  *
 144  * The SCC IOP controls both serial ports (A and B) as its two functions.
 145  * The ISM IOP controls the SWIM (floppy drive) and ADB.
 146  */
 147 
 148 static volatile struct mac_iop *iop_base[NUM_IOPS];
 149 
 150 /*
 151  * IOP message queues
 152  */
 153 
 154 static struct iop_msg iop_msg_pool[NUM_IOP_MSGS];
 155 static struct iop_msg *iop_send_queue[NUM_IOPS][NUM_IOP_CHAN];
 156 static struct listener iop_listeners[NUM_IOPS][NUM_IOP_CHAN];
 157 
 158 irqreturn_t iop_ism_irq(int, void *);
 159 
 160 /*
 161  * Private access functions
 162  */
 163 
 164 static __inline__ void iop_loadaddr(volatile struct mac_iop *iop, __u16 addr)
 165 {
 166         iop->ram_addr_lo = addr;
 167         iop->ram_addr_hi = addr >> 8;
 168 }
 169 
 170 static __inline__ __u8 iop_readb(volatile struct mac_iop *iop, __u16 addr)
 171 {
 172         iop->ram_addr_lo = addr;
 173         iop->ram_addr_hi = addr >> 8;
 174         return iop->ram_data;
 175 }
 176 
 177 static __inline__ void iop_writeb(volatile struct mac_iop *iop, __u16 addr, __u8 data)
 178 {
 179         iop->ram_addr_lo = addr;
 180         iop->ram_addr_hi = addr >> 8;
 181         iop->ram_data = data;
 182 }
 183 
 184 static __inline__ void iop_stop(volatile struct mac_iop *iop)
 185 {
 186         iop->status_ctrl &= ~IOP_RUN;
 187 }
 188 
 189 static __inline__ void iop_start(volatile struct mac_iop *iop)
 190 {
 191         iop->status_ctrl = IOP_RUN | IOP_AUTOINC;
 192 }
 193 
 194 static __inline__ void iop_bypass(volatile struct mac_iop *iop)
 195 {
 196         iop->status_ctrl |= IOP_BYPASS;
 197 }
 198 
 199 static __inline__ void iop_interrupt(volatile struct mac_iop *iop)
 200 {
 201         iop->status_ctrl |= IOP_IRQ;
 202 }
 203 
 204 static int iop_alive(volatile struct mac_iop *iop)
 205 {
 206         int retval;
 207 
 208         retval = (iop_readb(iop, IOP_ADDR_ALIVE) == 0xFF);
 209         iop_writeb(iop, IOP_ADDR_ALIVE, 0);
 210         return retval;
 211 }
 212 
 213 static struct iop_msg *iop_get_unused_msg(void)
 214 {
 215         int i;
 216         unsigned long flags;
 217 
 218         local_irq_save(flags);
 219 
 220         for (i = 0 ; i < NUM_IOP_MSGS ; i++) {
 221                 if (iop_msg_pool[i].status == IOP_MSGSTATUS_UNUSED) {
 222                         iop_msg_pool[i].status = IOP_MSGSTATUS_WAITING;
 223                         local_irq_restore(flags);
 224                         return &iop_msg_pool[i];
 225                 }
 226         }
 227 
 228         local_irq_restore(flags);
 229         return NULL;
 230 }
 231 
 232 /*
 233  * This is called by the startup code before anything else. Its purpose
 234  * is to find and initialize the IOPs early in the boot sequence, so that
 235  * the serial IOP can be placed into bypass mode _before_ we try to
 236  * initialize the serial console.
 237  */
 238 
 239 void __init iop_preinit(void)
 240 {
 241         if (macintosh_config->scc_type == MAC_SCC_IOP) {
 242                 if (macintosh_config->ident == MAC_MODEL_IIFX) {
 243                         iop_base[IOP_NUM_SCC] = (struct mac_iop *) SCC_IOP_BASE_IIFX;
 244                 } else {
 245                         iop_base[IOP_NUM_SCC] = (struct mac_iop *) SCC_IOP_BASE_QUADRA;
 246                 }
 247                 iop_base[IOP_NUM_SCC]->status_ctrl = 0x87;
 248                 iop_scc_present = 1;
 249         } else {
 250                 iop_base[IOP_NUM_SCC] = NULL;
 251                 iop_scc_present = 0;
 252         }
 253         if (macintosh_config->adb_type == MAC_ADB_IOP) {
 254                 if (macintosh_config->ident == MAC_MODEL_IIFX) {
 255                         iop_base[IOP_NUM_ISM] = (struct mac_iop *) ISM_IOP_BASE_IIFX;
 256                 } else {
 257                         iop_base[IOP_NUM_ISM] = (struct mac_iop *) ISM_IOP_BASE_QUADRA;
 258                 }
 259                 iop_base[IOP_NUM_ISM]->status_ctrl = 0;
 260                 iop_ism_present = 1;
 261         } else {
 262                 iop_base[IOP_NUM_ISM] = NULL;
 263                 iop_ism_present = 0;
 264         }
 265 }
 266 
 267 /*
 268  * Initialize the IOPs, if present.
 269  */
 270 
 271 void __init iop_init(void)
 272 {
 273         int i;
 274 
 275         if (iop_scc_present) {
 276                 pr_debug("SCC IOP detected at %p\n", iop_base[IOP_NUM_SCC]);
 277         }
 278         if (iop_ism_present) {
 279                 pr_debug("ISM IOP detected at %p\n", iop_base[IOP_NUM_ISM]);
 280                 iop_start(iop_base[IOP_NUM_ISM]);
 281                 iop_alive(iop_base[IOP_NUM_ISM]); /* clears the alive flag */
 282         }
 283 
 284         /* Make the whole pool available and empty the queues */
 285 
 286         for (i = 0 ; i < NUM_IOP_MSGS ; i++) {
 287                 iop_msg_pool[i].status = IOP_MSGSTATUS_UNUSED;
 288         }
 289 
 290         for (i = 0 ; i < NUM_IOP_CHAN ; i++) {
 291                 iop_send_queue[IOP_NUM_SCC][i] = NULL;
 292                 iop_send_queue[IOP_NUM_ISM][i] = NULL;
 293                 iop_listeners[IOP_NUM_SCC][i].devname = NULL;
 294                 iop_listeners[IOP_NUM_SCC][i].handler = NULL;
 295                 iop_listeners[IOP_NUM_ISM][i].devname = NULL;
 296                 iop_listeners[IOP_NUM_ISM][i].handler = NULL;
 297         }
 298 }
 299 
 300 /*
 301  * Register the interrupt handler for the IOPs.
 302  * TODO: might be wrong for non-OSS machines. Anyone?
 303  */
 304 
 305 void __init iop_register_interrupts(void)
 306 {
 307         if (iop_ism_present) {
 308                 if (macintosh_config->ident == MAC_MODEL_IIFX) {
 309                         if (request_irq(IRQ_MAC_ADB, iop_ism_irq, 0,
 310                                         "ISM IOP", (void *)IOP_NUM_ISM))
 311                                 pr_err("Couldn't register ISM IOP interrupt\n");
 312                 } else {
 313                         if (request_irq(IRQ_VIA2_0, iop_ism_irq, 0, "ISM IOP",
 314                                         (void *)IOP_NUM_ISM))
 315                                 pr_err("Couldn't register ISM IOP interrupt\n");
 316                 }
 317                 if (!iop_alive(iop_base[IOP_NUM_ISM])) {
 318                         pr_warn("IOP: oh my god, they killed the ISM IOP!\n");
 319                 } else {
 320                         pr_warn("IOP: the ISM IOP seems to be alive.\n");
 321                 }
 322         }
 323 }
 324 
 325 /*
 326  * Register or unregister a listener for a specific IOP and channel
 327  *
 328  * If the handler pointer is NULL the current listener (if any) is
 329  * unregistered. Otherwise the new listener is registered provided
 330  * there is no existing listener registered.
 331  */
 332 
 333 int iop_listen(uint iop_num, uint chan,
 334                 void (*handler)(struct iop_msg *),
 335                 const char *devname)
 336 {
 337         if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return -EINVAL;
 338         if (chan >= NUM_IOP_CHAN) return -EINVAL;
 339         if (iop_listeners[iop_num][chan].handler && handler) return -EINVAL;
 340         iop_listeners[iop_num][chan].devname = devname;
 341         iop_listeners[iop_num][chan].handler = handler;
 342         return 0;
 343 }
 344 
 345 /*
 346  * Complete reception of a message, which just means copying the reply
 347  * into the buffer, setting the channel state to MSG_COMPLETE and
 348  * notifying the IOP.
 349  */
 350 
 351 void iop_complete_message(struct iop_msg *msg)
 352 {
 353         int iop_num = msg->iop_num;
 354         int chan = msg->channel;
 355         int i,offset;
 356 
 357         iop_pr_debug("msg %p iop_num %d channel %d\n", msg, msg->iop_num,
 358                      msg->channel);
 359 
 360         offset = IOP_ADDR_RECV_MSG + (msg->channel * IOP_MSG_LEN);
 361 
 362         for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) {
 363                 iop_writeb(iop_base[iop_num], offset, msg->reply[i]);
 364         }
 365 
 366         iop_writeb(iop_base[iop_num],
 367                    IOP_ADDR_RECV_STATE + chan, IOP_MSG_COMPLETE);
 368         iop_interrupt(iop_base[msg->iop_num]);
 369 
 370         msg->status = IOP_MSGSTATUS_UNUSED;
 371 }
 372 
 373 /*
 374  * Actually put a message into a send channel buffer
 375  */
 376 
 377 static void iop_do_send(struct iop_msg *msg)
 378 {
 379         volatile struct mac_iop *iop = iop_base[msg->iop_num];
 380         int i,offset;
 381 
 382         offset = IOP_ADDR_SEND_MSG + (msg->channel * IOP_MSG_LEN);
 383 
 384         for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) {
 385                 iop_writeb(iop, offset, msg->message[i]);
 386         }
 387 
 388         iop_writeb(iop, IOP_ADDR_SEND_STATE + msg->channel, IOP_MSG_NEW);
 389 
 390         iop_interrupt(iop);
 391 }
 392 
 393 /*
 394  * Handle sending a message on a channel that
 395  * has gone into the IOP_MSG_COMPLETE state.
 396  */
 397 
 398 static void iop_handle_send(uint iop_num, uint chan)
 399 {
 400         volatile struct mac_iop *iop = iop_base[iop_num];
 401         struct iop_msg *msg;
 402         int i,offset;
 403 
 404         iop_pr_debug("iop_num %d chan %d\n", iop_num, chan);
 405 
 406         iop_writeb(iop, IOP_ADDR_SEND_STATE + chan, IOP_MSG_IDLE);
 407 
 408         if (!(msg = iop_send_queue[iop_num][chan])) return;
 409 
 410         msg->status = IOP_MSGSTATUS_COMPLETE;
 411         offset = IOP_ADDR_SEND_MSG + (chan * IOP_MSG_LEN);
 412         for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) {
 413                 msg->reply[i] = iop_readb(iop, offset);
 414         }
 415         if (msg->handler) (*msg->handler)(msg);
 416         msg->status = IOP_MSGSTATUS_UNUSED;
 417         msg = msg->next;
 418         iop_send_queue[iop_num][chan] = msg;
 419         if (msg) iop_do_send(msg);
 420 }
 421 
 422 /*
 423  * Handle reception of a message on a channel that has
 424  * gone into the IOP_MSG_NEW state.
 425  */
 426 
 427 static void iop_handle_recv(uint iop_num, uint chan)
 428 {
 429         volatile struct mac_iop *iop = iop_base[iop_num];
 430         int i,offset;
 431         struct iop_msg *msg;
 432 
 433         iop_pr_debug("iop_num %d chan %d\n", iop_num, chan);
 434 
 435         msg = iop_get_unused_msg();
 436         msg->iop_num = iop_num;
 437         msg->channel = chan;
 438         msg->status = IOP_MSGSTATUS_UNSOL;
 439         msg->handler = iop_listeners[iop_num][chan].handler;
 440 
 441         offset = IOP_ADDR_RECV_MSG + (chan * IOP_MSG_LEN);
 442 
 443         for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) {
 444                 msg->message[i] = iop_readb(iop, offset);
 445         }
 446 
 447         iop_writeb(iop, IOP_ADDR_RECV_STATE + chan, IOP_MSG_RCVD);
 448 
 449         /* If there is a listener, call it now. Otherwise complete */
 450         /* the message ourselves to avoid possible stalls.         */
 451 
 452         if (msg->handler) {
 453                 (*msg->handler)(msg);
 454         } else {
 455                 iop_pr_debug("unclaimed message on iop_num %d chan %d\n",
 456                              iop_num, chan);
 457                 iop_pr_debug("%*ph\n", IOP_MSG_LEN, msg->message);
 458                 iop_complete_message(msg);
 459         }
 460 }
 461 
 462 /*
 463  * Send a message
 464  *
 465  * The message is placed at the end of the send queue. Afterwards if the
 466  * channel is idle we force an immediate send of the next message in the
 467  * queue.
 468  */
 469 
 470 int iop_send_message(uint iop_num, uint chan, void *privdata,
 471                       uint msg_len, __u8 *msg_data,
 472                       void (*handler)(struct iop_msg *))
 473 {
 474         struct iop_msg *msg, *q;
 475 
 476         if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return -EINVAL;
 477         if (chan >= NUM_IOP_CHAN) return -EINVAL;
 478         if (msg_len > IOP_MSG_LEN) return -EINVAL;
 479 
 480         msg = iop_get_unused_msg();
 481         if (!msg) return -ENOMEM;
 482 
 483         msg->next = NULL;
 484         msg->status = IOP_MSGSTATUS_WAITING;
 485         msg->iop_num = iop_num;
 486         msg->channel = chan;
 487         msg->caller_priv = privdata;
 488         memcpy(msg->message, msg_data, msg_len);
 489         msg->handler = handler;
 490 
 491         if (!(q = iop_send_queue[iop_num][chan])) {
 492                 iop_send_queue[iop_num][chan] = msg;
 493         } else {
 494                 while (q->next) q = q->next;
 495                 q->next = msg;
 496         }
 497 
 498         if (iop_readb(iop_base[iop_num],
 499             IOP_ADDR_SEND_STATE + chan) == IOP_MSG_IDLE) {
 500                 iop_do_send(msg);
 501         }
 502 
 503         return 0;
 504 }
 505 
 506 /*
 507  * Upload code to the shared RAM of an IOP.
 508  */
 509 
 510 void iop_upload_code(uint iop_num, __u8 *code_start,
 511                      uint code_len, __u16 shared_ram_start)
 512 {
 513         if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return;
 514 
 515         iop_loadaddr(iop_base[iop_num], shared_ram_start);
 516 
 517         while (code_len--) {
 518                 iop_base[iop_num]->ram_data = *code_start++;
 519         }
 520 }
 521 
 522 /*
 523  * Download code from the shared RAM of an IOP.
 524  */
 525 
 526 void iop_download_code(uint iop_num, __u8 *code_start,
 527                        uint code_len, __u16 shared_ram_start)
 528 {
 529         if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return;
 530 
 531         iop_loadaddr(iop_base[iop_num], shared_ram_start);
 532 
 533         while (code_len--) {
 534                 *code_start++ = iop_base[iop_num]->ram_data;
 535         }
 536 }
 537 
 538 /*
 539  * Compare the code in the shared RAM of an IOP with a copy in system memory
 540  * and return 0 on match or the first nonmatching system memory address on
 541  * failure.
 542  */
 543 
 544 __u8 *iop_compare_code(uint iop_num, __u8 *code_start,
 545                        uint code_len, __u16 shared_ram_start)
 546 {
 547         if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return code_start;
 548 
 549         iop_loadaddr(iop_base[iop_num], shared_ram_start);
 550 
 551         while (code_len--) {
 552                 if (*code_start != iop_base[iop_num]->ram_data) {
 553                         return code_start;
 554                 }
 555                 code_start++;
 556         }
 557         return (__u8 *) 0;
 558 }
 559 
 560 /*
 561  * Handle an ISM IOP interrupt
 562  */
 563 
 564 irqreturn_t iop_ism_irq(int irq, void *dev_id)
 565 {
 566         uint iop_num = (uint) dev_id;
 567         volatile struct mac_iop *iop = iop_base[iop_num];
 568         int i,state;
 569 
 570         iop_pr_debug("status %02X\n", iop->status_ctrl);
 571 
 572         /* INT0 indicates a state change on an outgoing message channel */
 573 
 574         if (iop->status_ctrl & IOP_INT0) {
 575                 iop->status_ctrl = IOP_INT0 | IOP_RUN | IOP_AUTOINC;
 576                 iop_pr_debug("new status %02X, send states", iop->status_ctrl);
 577                 for (i = 0 ; i < NUM_IOP_CHAN  ; i++) {
 578                         state = iop_readb(iop, IOP_ADDR_SEND_STATE + i);
 579                         iop_pr_cont(" %02X", state);
 580                         if (state == IOP_MSG_COMPLETE) {
 581                                 iop_handle_send(iop_num, i);
 582                         }
 583                 }
 584                 iop_pr_cont("\n");
 585         }
 586 
 587         if (iop->status_ctrl & IOP_INT1) {      /* INT1 for incoming msgs */
 588                 iop->status_ctrl = IOP_INT1 | IOP_RUN | IOP_AUTOINC;
 589                 iop_pr_debug("new status %02X, recv states", iop->status_ctrl);
 590                 for (i = 0 ; i < NUM_IOP_CHAN ; i++) {
 591                         state = iop_readb(iop, IOP_ADDR_RECV_STATE + i);
 592                         iop_pr_cont(" %02X", state);
 593                         if (state == IOP_MSG_NEW) {
 594                                 iop_handle_recv(iop_num, i);
 595                         }
 596                 }
 597                 iop_pr_cont("\n");
 598         }
 599         return IRQ_HANDLED;
 600 }
 601 
 602 void iop_ism_irq_poll(uint iop_num)
 603 {
 604         unsigned long flags;
 605 
 606         local_irq_save(flags);
 607         iop_ism_irq(0, (void *)iop_num);
 608         local_irq_restore(flags);
 609 }