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/arch/m68k/mac/iop.c

https://bitbucket.org/evzijst/gittest
C | 714 lines | 422 code | 113 blank | 179 comment | 77 complexity | 4cb62944f88392f799f5e2b1560ff779 MD5 | raw file
  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 conneced 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 signifigant amount of time (handlers are called at interrupt time so they
104 * should execute quickly.)
105 */
106
107#include <linux/config.h>
108#include <linux/types.h>
109#include <linux/kernel.h>
110#include <linux/mm.h>
111#include <linux/delay.h>
112#include <linux/init.h>
113#include <linux/proc_fs.h>
114#include <linux/interrupt.h>
115
116#include <asm/bootinfo.h>
117#include <asm/macintosh.h>
118#include <asm/macints.h>
119#include <asm/mac_iop.h>
120#include <asm/mac_oss.h>
121
122/*#define DEBUG_IOP*/
123
124/* Set to nonezero if the IOPs are present. Set by iop_init() */
125
126int iop_scc_present,iop_ism_present;
127
128#ifdef CONFIG_PROC_FS
129static int iop_get_proc_info(char *, char **, off_t, int);
130#endif /* CONFIG_PROC_FS */
131
132/* structure for tracking channel listeners */
133
134struct listener {
135	const char *devname;
136	void (*handler)(struct iop_msg *, struct pt_regs *);
137};
138
139/*
140 * IOP structures for the two IOPs
141 *
142 * The SCC IOP controls both serial ports (A and B) as its two functions.
143 * The ISM IOP controls the SWIM (floppy drive) and ADB.
144 */
145
146static volatile struct mac_iop *iop_base[NUM_IOPS];
147
148/*
149 * IOP message queues
150 */
151
152static struct iop_msg iop_msg_pool[NUM_IOP_MSGS];
153static struct iop_msg *iop_send_queue[NUM_IOPS][NUM_IOP_CHAN];
154static struct listener iop_listeners[NUM_IOPS][NUM_IOP_CHAN];
155
156irqreturn_t iop_ism_irq(int, void *, struct pt_regs *);
157
158extern void oss_irq_enable(int);
159
160/*
161 * Private access functions
162 */
163
164static __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
170static __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
177static __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
184static __inline__ void iop_stop(volatile struct mac_iop *iop)
185{
186	iop->status_ctrl &= ~IOP_RUN;
187}
188
189static __inline__ void iop_start(volatile struct mac_iop *iop)
190{
191	iop->status_ctrl = IOP_RUN | IOP_AUTOINC;
192}
193
194static __inline__ void iop_bypass(volatile struct mac_iop *iop)
195{
196	iop->status_ctrl |= IOP_BYPASS;
197}
198
199static __inline__ void iop_interrupt(volatile struct mac_iop *iop)
200{
201	iop->status_ctrl |= IOP_IRQ;
202}
203
204static 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
213static struct iop_msg *iop_alloc_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
232static void iop_free_msg(struct iop_msg *msg)
233{
234	msg->status = IOP_MSGSTATUS_UNUSED;
235}
236
237/*
238 * This is called by the startup code before anything else. Its purpose
239 * is to find and initialize the IOPs early in the boot sequence, so that
240 * the serial IOP can be placed into bypass mode _before_ we try to
241 * initialize the serial console.
242 */
243
244void __init iop_preinit(void)
245{
246	if (macintosh_config->scc_type == MAC_SCC_IOP) {
247		if (macintosh_config->ident == MAC_MODEL_IIFX) {
248			iop_base[IOP_NUM_SCC] = (struct mac_iop *) SCC_IOP_BASE_IIFX;
249		} else {
250			iop_base[IOP_NUM_SCC] = (struct mac_iop *) SCC_IOP_BASE_QUADRA;
251		}
252		iop_base[IOP_NUM_SCC]->status_ctrl = 0x87;
253		iop_scc_present = 1;
254	} else {
255		iop_base[IOP_NUM_SCC] = NULL;
256		iop_scc_present = 0;
257	}
258	if (macintosh_config->adb_type == MAC_ADB_IOP) {
259		if (macintosh_config->ident == MAC_MODEL_IIFX) {
260			iop_base[IOP_NUM_ISM] = (struct mac_iop *) ISM_IOP_BASE_IIFX;
261		} else {
262			iop_base[IOP_NUM_ISM] = (struct mac_iop *) ISM_IOP_BASE_QUADRA;
263		}
264		iop_base[IOP_NUM_ISM]->status_ctrl = 0;
265		iop_ism_present = 1;
266	} else {
267		iop_base[IOP_NUM_ISM] = NULL;
268		iop_ism_present = 0;
269	}
270}
271
272/*
273 * Initialize the IOPs, if present.
274 */
275
276void __init iop_init(void)
277{
278	int i;
279
280	if (iop_scc_present) {
281		printk("IOP: detected SCC IOP at %p\n", iop_base[IOP_NUM_SCC]);
282	}
283	if (iop_ism_present) {
284		printk("IOP: detected ISM IOP at %p\n", iop_base[IOP_NUM_ISM]);
285		iop_start(iop_base[IOP_NUM_ISM]);
286		iop_alive(iop_base[IOP_NUM_ISM]); /* clears the alive flag */
287	}
288
289	/* Make the whole pool available and empty the queues */
290
291	for (i = 0 ; i < NUM_IOP_MSGS ; i++) {
292		iop_msg_pool[i].status = IOP_MSGSTATUS_UNUSED;
293	}
294
295	for (i = 0 ; i < NUM_IOP_CHAN ; i++) {
296		iop_send_queue[IOP_NUM_SCC][i] = 0;
297		iop_send_queue[IOP_NUM_ISM][i] = 0;
298		iop_listeners[IOP_NUM_SCC][i].devname = NULL;
299		iop_listeners[IOP_NUM_SCC][i].handler = NULL;
300		iop_listeners[IOP_NUM_ISM][i].devname = NULL;
301		iop_listeners[IOP_NUM_ISM][i].handler = NULL;
302	}
303
304#if 0	/* Crashing in 2.4 now, not yet sure why.   --jmt */
305#ifdef CONFIG_PROC_FS
306	create_proc_info_entry("mac_iop", 0, &proc_root, iop_get_proc_info);
307#endif
308#endif
309}
310
311/*
312 * Register the interrupt handler for the IOPs.
313 * TODO: might be wrong for non-OSS machines. Anyone?
314 */
315
316void __init iop_register_interrupts(void)
317{
318	if (iop_ism_present) {
319		if (oss_present) {
320			cpu_request_irq(OSS_IRQLEV_IOPISM, iop_ism_irq,
321					IRQ_FLG_LOCK, "ISM IOP",
322					(void *) IOP_NUM_ISM);
323			oss_irq_enable(IRQ_MAC_ADB);
324		} else {
325			request_irq(IRQ_VIA2_0, iop_ism_irq,
326					IRQ_FLG_LOCK|IRQ_FLG_FAST, "ISM IOP",
327					(void *) IOP_NUM_ISM);
328		}
329		if (!iop_alive(iop_base[IOP_NUM_ISM])) {
330			printk("IOP: oh my god, they killed the ISM IOP!\n");
331		} else {
332			printk("IOP: the ISM IOP seems to be alive.\n");
333		}
334	}
335}
336
337/*
338 * Register or unregister a listener for a specific IOP and channel
339 *
340 * If the handler pointer is NULL the current listener (if any) is
341 * unregistered. Otherwise the new listener is registered provided
342 * there is no existing listener registered.
343 */
344
345int iop_listen(uint iop_num, uint chan,
346		void (*handler)(struct iop_msg *, struct pt_regs *),
347		const char *devname)
348{
349	if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return -EINVAL;
350	if (chan >= NUM_IOP_CHAN) return -EINVAL;
351	if (iop_listeners[iop_num][chan].handler && handler) return -EINVAL;
352	iop_listeners[iop_num][chan].devname = devname;
353	iop_listeners[iop_num][chan].handler = handler;
354	return 0;
355}
356
357/*
358 * Complete reception of a message, which just means copying the reply
359 * into the buffer, setting the channel state to MSG_COMPLETE and
360 * notifying the IOP.
361 */
362
363void iop_complete_message(struct iop_msg *msg)
364{
365	int iop_num = msg->iop_num;
366	int chan = msg->channel;
367	int i,offset;
368
369#ifdef DEBUG_IOP
370	printk("iop_complete(%p): iop %d chan %d\n", msg, msg->iop_num, msg->channel);
371#endif
372
373	offset = IOP_ADDR_RECV_MSG + (msg->channel * IOP_MSG_LEN);
374
375	for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) {
376		iop_writeb(iop_base[iop_num], offset, msg->reply[i]);
377	}
378
379	iop_writeb(iop_base[iop_num],
380		   IOP_ADDR_RECV_STATE + chan, IOP_MSG_COMPLETE);
381	iop_interrupt(iop_base[msg->iop_num]);
382
383	iop_free_msg(msg);
384}
385
386/*
387 * Actually put a message into a send channel buffer
388 */
389
390static void iop_do_send(struct iop_msg *msg)
391{
392	volatile struct mac_iop *iop = iop_base[msg->iop_num];
393	int i,offset;
394
395	offset = IOP_ADDR_SEND_MSG + (msg->channel * IOP_MSG_LEN);
396
397	for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) {
398		iop_writeb(iop, offset, msg->message[i]);
399	}
400
401	iop_writeb(iop, IOP_ADDR_SEND_STATE + msg->channel, IOP_MSG_NEW);
402
403	iop_interrupt(iop);
404}
405
406/*
407 * Handle sending a message on a channel that
408 * has gone into the IOP_MSG_COMPLETE state.
409 */
410
411static void iop_handle_send(uint iop_num, uint chan, struct pt_regs *regs)
412{
413	volatile struct mac_iop *iop = iop_base[iop_num];
414	struct iop_msg *msg,*msg2;
415	int i,offset;
416
417#ifdef DEBUG_IOP
418	printk("iop_handle_send: iop %d channel %d\n", iop_num, chan);
419#endif
420
421	iop_writeb(iop, IOP_ADDR_SEND_STATE + chan, IOP_MSG_IDLE);
422
423	if (!(msg = iop_send_queue[iop_num][chan])) return;
424
425	msg->status = IOP_MSGSTATUS_COMPLETE;
426	offset = IOP_ADDR_SEND_MSG + (chan * IOP_MSG_LEN);
427	for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) {
428		msg->reply[i] = iop_readb(iop, offset);
429	}
430	if (msg->handler) (*msg->handler)(msg, regs);
431	msg2 = msg;
432	msg = msg->next;
433	iop_free_msg(msg2);
434
435	iop_send_queue[iop_num][chan] = msg;
436	if (msg) iop_do_send(msg);
437}
438
439/*
440 * Handle reception of a message on a channel that has
441 * gone into the IOP_MSG_NEW state.
442 */
443
444static void iop_handle_recv(uint iop_num, uint chan, struct pt_regs *regs)
445{
446	volatile struct mac_iop *iop = iop_base[iop_num];
447	int i,offset;
448	struct iop_msg *msg;
449
450#ifdef DEBUG_IOP
451	printk("iop_handle_recv: iop %d channel %d\n", iop_num, chan);
452#endif
453
454	msg = iop_alloc_msg();
455	msg->iop_num = iop_num;
456	msg->channel = chan;
457	msg->status = IOP_MSGSTATUS_UNSOL;
458	msg->handler = iop_listeners[iop_num][chan].handler;
459
460	offset = IOP_ADDR_RECV_MSG + (chan * IOP_MSG_LEN);
461
462	for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) {
463		msg->message[i] = iop_readb(iop, offset);
464	}
465
466	iop_writeb(iop, IOP_ADDR_RECV_STATE + chan, IOP_MSG_RCVD);
467
468	/* If there is a listener, call it now. Otherwise complete */
469	/* the message ourselves to avoid possible stalls.         */
470
471	if (msg->handler) {
472		(*msg->handler)(msg, regs);
473	} else {
474#ifdef DEBUG_IOP
475		printk("iop_handle_recv: unclaimed message on iop %d channel %d\n", iop_num, chan);
476		printk("iop_handle_recv:");
477		for (i = 0 ; i < IOP_MSG_LEN ; i++) {
478			printk(" %02X", (uint) msg->message[i]);
479		}
480		printk("\n");
481#endif
482		iop_complete_message(msg);
483	}
484}
485
486/*
487 * Send a message
488 *
489 * The message is placed at the end of the send queue. Afterwards if the
490 * channel is idle we force an immediate send of the next message in the
491 * queue.
492 */
493
494int iop_send_message(uint iop_num, uint chan, void *privdata,
495		      uint msg_len, __u8 *msg_data,
496		      void (*handler)(struct iop_msg *, struct pt_regs *))
497{
498	struct iop_msg *msg, *q;
499
500	if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return -EINVAL;
501	if (chan >= NUM_IOP_CHAN) return -EINVAL;
502	if (msg_len > IOP_MSG_LEN) return -EINVAL;
503
504	msg = iop_alloc_msg();
505	if (!msg) return -ENOMEM;
506
507	msg->next = NULL;
508	msg->status = IOP_MSGSTATUS_WAITING;
509	msg->iop_num = iop_num;
510	msg->channel = chan;
511	msg->caller_priv = privdata;
512	memcpy(msg->message, msg_data, msg_len);
513	msg->handler = handler;
514
515	if (!(q = iop_send_queue[iop_num][chan])) {
516		iop_send_queue[iop_num][chan] = msg;
517	} else {
518		while (q->next) q = q->next;
519		q->next = msg;
520	}
521
522	if (iop_readb(iop_base[iop_num],
523	    IOP_ADDR_SEND_STATE + chan) == IOP_MSG_IDLE) {
524		iop_do_send(msg);
525	}
526
527	return 0;
528}
529
530/*
531 * Upload code to the shared RAM of an IOP.
532 */
533
534void iop_upload_code(uint iop_num, __u8 *code_start,
535		     uint code_len, __u16 shared_ram_start)
536{
537	if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return;
538
539	iop_loadaddr(iop_base[iop_num], shared_ram_start);
540
541	while (code_len--) {
542		iop_base[iop_num]->ram_data = *code_start++;
543	}
544}
545
546/*
547 * Download code from the shared RAM of an IOP.
548 */
549
550void iop_download_code(uint iop_num, __u8 *code_start,
551		       uint code_len, __u16 shared_ram_start)
552{
553	if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return;
554
555	iop_loadaddr(iop_base[iop_num], shared_ram_start);
556
557	while (code_len--) {
558		*code_start++ = iop_base[iop_num]->ram_data;
559	}
560}
561
562/*
563 * Compare the code in the shared RAM of an IOP with a copy in system memory
564 * and return 0 on match or the first nonmatching system memory address on
565 * failure.
566 */
567
568__u8 *iop_compare_code(uint iop_num, __u8 *code_start,
569		       uint code_len, __u16 shared_ram_start)
570{
571	if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return code_start;
572
573	iop_loadaddr(iop_base[iop_num], shared_ram_start);
574
575	while (code_len--) {
576		if (*code_start != iop_base[iop_num]->ram_data) {
577			return code_start;
578		}
579		code_start++;
580	}
581	return (__u8 *) 0;
582}
583
584/*
585 * Handle an ISM IOP interrupt
586 */
587
588irqreturn_t iop_ism_irq(int irq, void *dev_id, struct pt_regs *regs)
589{
590	uint iop_num = (uint) dev_id;
591	volatile struct mac_iop *iop = iop_base[iop_num];
592	int i,state;
593
594#ifdef DEBUG_IOP
595	printk("iop_ism_irq: status = %02X\n", (uint) iop->status_ctrl);
596#endif
597
598	/* INT0 indicates a state change on an outgoing message channel */
599
600	if (iop->status_ctrl & IOP_INT0) {
601		iop->status_ctrl = IOP_INT0 | IOP_RUN | IOP_AUTOINC;
602#ifdef DEBUG_IOP
603		printk("iop_ism_irq: new status = %02X, send states",
604			(uint) iop->status_ctrl);
605#endif
606		for (i = 0 ; i < NUM_IOP_CHAN  ; i++) {
607			state = iop_readb(iop, IOP_ADDR_SEND_STATE + i);
608#ifdef DEBUG_IOP
609			printk(" %02X", state);
610#endif
611			if (state == IOP_MSG_COMPLETE) {
612				iop_handle_send(iop_num, i, regs);
613			}
614		}
615#ifdef DEBUG_IOP
616		printk("\n");
617#endif
618	}
619
620	if (iop->status_ctrl & IOP_INT1) {	/* INT1 for incoming msgs */
621		iop->status_ctrl = IOP_INT1 | IOP_RUN | IOP_AUTOINC;
622#ifdef DEBUG_IOP
623		printk("iop_ism_irq: new status = %02X, recv states",
624			(uint) iop->status_ctrl);
625#endif
626		for (i = 0 ; i < NUM_IOP_CHAN ; i++) {
627			state = iop_readb(iop, IOP_ADDR_RECV_STATE + i);
628#ifdef DEBUG_IOP
629			printk(" %02X", state);
630#endif
631			if (state == IOP_MSG_NEW) {
632				iop_handle_recv(iop_num, i, regs);
633			}
634		}
635#ifdef DEBUG_IOP
636		printk("\n");
637#endif
638	}
639	return IRQ_HANDLED;
640}
641
642#ifdef CONFIG_PROC_FS
643
644char *iop_chan_state(int state)
645{
646	switch(state) {
647		case IOP_MSG_IDLE	: return "idle      ";
648		case IOP_MSG_NEW	: return "new       ";
649		case IOP_MSG_RCVD	: return "received  ";
650		case IOP_MSG_COMPLETE	: return "completed ";
651		default			: return "unknown   ";
652	}
653}
654
655int iop_dump_one_iop(char *buf, int iop_num, char *iop_name)
656{
657	int i,len = 0;
658	volatile struct mac_iop *iop = iop_base[iop_num];
659
660	len += sprintf(buf+len, "%s IOP channel states:\n\n", iop_name);
661	len += sprintf(buf+len, "##  send_state  recv_state  device\n");
662	len += sprintf(buf+len, "------------------------------------------------\n");
663	for (i = 0 ; i < NUM_IOP_CHAN ; i++) {
664		len += sprintf(buf+len, "%2d  %10s  %10s  %s\n", i,
665			iop_chan_state(iop_readb(iop, IOP_ADDR_SEND_STATE+i)),
666			iop_chan_state(iop_readb(iop, IOP_ADDR_RECV_STATE+i)),
667			iop_listeners[iop_num][i].handler?
668				      iop_listeners[iop_num][i].devname : "");
669
670	}
671	len += sprintf(buf+len, "\n");
672	return len;
673}
674
675static int iop_get_proc_info(char *buf, char **start, off_t pos, int count)
676{
677	int len, cnt;
678
679	cnt = 0;
680	len =  sprintf(buf, "IOPs detected:\n\n");
681
682	if (iop_scc_present) {
683		len += sprintf(buf+len, "SCC IOP (%p): status %02X\n",
684				iop_base[IOP_NUM_SCC],
685				(uint) iop_base[IOP_NUM_SCC]->status_ctrl);
686	}
687	if (iop_ism_present) {
688		len += sprintf(buf+len, "ISM IOP (%p): status %02X\n\n",
689				iop_base[IOP_NUM_ISM],
690				(uint) iop_base[IOP_NUM_ISM]->status_ctrl);
691	}
692
693	if (iop_scc_present) {
694		len += iop_dump_one_iop(buf+len, IOP_NUM_SCC, "SCC");
695
696	}
697
698	if (iop_ism_present) {
699		len += iop_dump_one_iop(buf+len, IOP_NUM_ISM, "ISM");
700
701	}
702
703	if (len >= pos) {
704		if (!*start) {
705			*start = buf + pos;
706			cnt = len - pos;
707		} else {
708			cnt += len;
709		}
710	}
711	return (count > cnt) ? cnt : count;
712}
713
714#endif /* CONFIG_PROC_FS */