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Root/drivers/rapidio/rio.c

1	/*
2	* RapidIO interconnect services
3	* (RapidIO Interconnect Specification, http://www.rapidio.org)
4	*
5	* Copyright 2005 MontaVista Software, Inc.
6	* Matt Porter <mporter@kernel.crashing.org>
7	*
8	* Copyright 2009 Integrated Device Technology, Inc.
9	* Alex Bounine <alexandre.bounine@idt.com>
10	* - Added Port-Write/Error Management initialization and handling
11	*
12	* This program is free software; you can redistribute it and/or modify it
13	* under the terms of the GNU General Public License as published by the
14	* Free Software Foundation; either version 2 of the License, or (at your
15	* option) any later version.
16	*/
17
18	#include <linux/types.h>
19	#include <linux/kernel.h>
20
21	#include <linux/delay.h>
22	#include <linux/init.h>
23	#include <linux/rio.h>
24	#include <linux/rio_drv.h>
25	#include <linux/rio_ids.h>
26	#include <linux/rio_regs.h>
27	#include <linux/module.h>
28	#include <linux/spinlock.h>
29	#include <linux/slab.h>
30	#include <linux/interrupt.h>
31
32	#include "rio.h"
33
34	static LIST_HEAD(rio_mports);
35	static unsigned char next_portid;
36
37	/**
38	* rio_local_get_device_id - Get the base/extended device id for a port
39	* @port: RIO master port from which to get the deviceid
40	*
41	* Reads the base/extended device id from the local device
42	* implementing the master port. Returns the 8/16-bit device
43	* id.
44	*/
45	u16 rio_local_get_device_id(struct rio_mport *port)
46	{
47	u32 result;
48
49	rio_local_read_config_32(port, RIO_DID_CSR, &result);
50
51	return (RIO_GET_DID(port->sys_size, result));
52	}
53
54	/**
55	* rio_request_inb_mbox - request inbound mailbox service
56	* @mport: RIO master port from which to allocate the mailbox resource
57	* @dev_id: Device specific pointer to pass on event
58	* @mbox: Mailbox number to claim
59	* @entries: Number of entries in inbound mailbox queue
60	* @minb: Callback to execute when inbound message is received
61	*
62	* Requests ownership of an inbound mailbox resource and binds
63	* a callback function to the resource. Returns %0 on success.
64	*/
65	int rio_request_inb_mbox(struct rio_mport *mport,
66	void *dev_id,
67	int mbox,
68	int entries,
69	void (minb) (struct rio_mport mport, void *dev_id, int mbox,
70	int slot))
71	{
72	int rc = -ENOSYS;
73	struct resource *res;
74
75	if (mport->ops->open_inb_mbox == NULL)
76	goto out;
77
78	res = kmalloc(sizeof(struct resource), GFP_KERNEL);
79
80	if (res) {
81	rio_init_mbox_res(res, mbox, mbox);
82
83	/* Make sure this mailbox isn't in use */
84	if ((rc =
85	request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],
86	res)) < 0) {
87	kfree(res);
88	goto out;
89	}
90
91	mport->inb_msg[mbox].res = res;
92
93	/* Hook the inbound message callback */
94	mport->inb_msg[mbox].mcback = minb;
95
96	rc = mport->ops->open_inb_mbox(mport, dev_id, mbox, entries);
97	} else
98	rc = -ENOMEM;
99
100	out:
101	return rc;
102	}
103
104	/**
105	* rio_release_inb_mbox - release inbound mailbox message service
106	* @mport: RIO master port from which to release the mailbox resource
107	* @mbox: Mailbox number to release
108	*
109	* Releases ownership of an inbound mailbox resource. Returns 0
110	* if the request has been satisfied.
111	*/
112	int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
113	{
114	if (mport->ops->close_inb_mbox) {
115	mport->ops->close_inb_mbox(mport, mbox);
116
117	/* Release the mailbox resource */
118	return release_resource(mport->inb_msg[mbox].res);
119	} else
120	return -ENOSYS;
121	}
122
123	/**
124	* rio_request_outb_mbox - request outbound mailbox service
125	* @mport: RIO master port from which to allocate the mailbox resource
126	* @dev_id: Device specific pointer to pass on event
127	* @mbox: Mailbox number to claim
128	* @entries: Number of entries in outbound mailbox queue
129	* @moutb: Callback to execute when outbound message is sent
130	*
131	* Requests ownership of an outbound mailbox resource and binds
132	* a callback function to the resource. Returns 0 on success.
133	*/
134	int rio_request_outb_mbox(struct rio_mport *mport,
135	void *dev_id,
136	int mbox,
137	int entries,
138	void (moutb) (struct rio_mport mport, void *dev_id, int mbox, int slot))
139	{
140	int rc = -ENOSYS;
141	struct resource *res;
142
143	if (mport->ops->open_outb_mbox == NULL)
144	goto out;
145
146	res = kmalloc(sizeof(struct resource), GFP_KERNEL);
147
148	if (res) {
149	rio_init_mbox_res(res, mbox, mbox);
150
151	/* Make sure this outbound mailbox isn't in use */
152	if ((rc =
153	request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],
154	res)) < 0) {
155	kfree(res);
156	goto out;
157	}
158
159	mport->outb_msg[mbox].res = res;
160
161	/* Hook the inbound message callback */
162	mport->outb_msg[mbox].mcback = moutb;
163
164	rc = mport->ops->open_outb_mbox(mport, dev_id, mbox, entries);
165	} else
166	rc = -ENOMEM;
167
168	out:
169	return rc;
170	}
171
172	/**
173	* rio_release_outb_mbox - release outbound mailbox message service
174	* @mport: RIO master port from which to release the mailbox resource
175	* @mbox: Mailbox number to release
176	*
177	* Releases ownership of an inbound mailbox resource. Returns 0
178	* if the request has been satisfied.
179	*/
180	int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
181	{
182	if (mport->ops->close_outb_mbox) {
183	mport->ops->close_outb_mbox(mport, mbox);
184
185	/* Release the mailbox resource */
186	return release_resource(mport->outb_msg[mbox].res);
187	} else
188	return -ENOSYS;
189	}
190
191	/**
192	* rio_setup_inb_dbell - bind inbound doorbell callback
193	* @mport: RIO master port to bind the doorbell callback
194	* @dev_id: Device specific pointer to pass on event
195	* @res: Doorbell message resource
196	* @dinb: Callback to execute when doorbell is received
197	*
198	* Adds a doorbell resource/callback pair into a port's
199	* doorbell event list. Returns 0 if the request has been
200	* satisfied.
201	*/
202	static int
203	rio_setup_inb_dbell(struct rio_mport mport, void dev_id, struct resource *res,
204	void (dinb) (struct rio_mport mport, void *dev_id, u16 src, u16 dst,
205	u16 info))
206	{
207	int rc = 0;
208	struct rio_dbell *dbell;
209
210	if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
211	rc = -ENOMEM;
212	goto out;
213	}
214
215	dbell->res = res;
216	dbell->dinb = dinb;
217	dbell->dev_id = dev_id;
218
219	list_add_tail(&dbell->node, &mport->dbells);
220
221	out:
222	return rc;
223	}
224
225	/**
226	* rio_request_inb_dbell - request inbound doorbell message service
227	* @mport: RIO master port from which to allocate the doorbell resource
228	* @dev_id: Device specific pointer to pass on event
229	* @start: Doorbell info range start
230	* @end: Doorbell info range end
231	* @dinb: Callback to execute when doorbell is received
232	*
233	* Requests ownership of an inbound doorbell resource and binds
234	* a callback function to the resource. Returns 0 if the request
235	* has been satisfied.
236	*/
237	int rio_request_inb_dbell(struct rio_mport *mport,
238	void *dev_id,
239	u16 start,
240	u16 end,
241	void (dinb) (struct rio_mport mport, void *dev_id, u16 src,
242	u16 dst, u16 info))
243	{
244	int rc = 0;
245
246	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
247
248	if (res) {
249	rio_init_dbell_res(res, start, end);
250
251	/* Make sure these doorbells aren't in use */
252	if ((rc =
253	request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],
254	res)) < 0) {
255	kfree(res);
256	goto out;
257	}
258
259	/* Hook the doorbell callback */
260	rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);
261	} else
262	rc = -ENOMEM;
263
264	out:
265	return rc;
266	}
267
268	/**
269	* rio_release_inb_dbell - release inbound doorbell message service
270	* @mport: RIO master port from which to release the doorbell resource
271	* @start: Doorbell info range start
272	* @end: Doorbell info range end
273	*
274	* Releases ownership of an inbound doorbell resource and removes
275	* callback from the doorbell event list. Returns 0 if the request
276	* has been satisfied.
277	*/
278	int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
279	{
280	int rc = 0, found = 0;
281	struct rio_dbell *dbell;
282
283	list_for_each_entry(dbell, &mport->dbells, node) {
284	if ((dbell->res->start == start) && (dbell->res->end == end)) {
285	found = 1;
286	break;
287	}
288	}
289
290	/* If we can't find an exact match, fail */
291	if (!found) {
292	rc = -EINVAL;
293	goto out;
294	}
295
296	/* Delete from list */
297	list_del(&dbell->node);
298
299	/* Release the doorbell resource */
300	rc = release_resource(dbell->res);
301
302	/* Free the doorbell event */
303	kfree(dbell);
304
305	out:
306	return rc;
307	}
308
309	/**
310	* rio_request_outb_dbell - request outbound doorbell message range
311	* @rdev: RIO device from which to allocate the doorbell resource
312	* @start: Doorbell message range start
313	* @end: Doorbell message range end
314	*
315	* Requests ownership of a doorbell message range. Returns a resource
316	* if the request has been satisfied or %NULL on failure.
317	*/
318	struct resource rio_request_outb_dbell(struct rio_dev rdev, u16 start,
319	u16 end)
320	{
321	struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
322
323	if (res) {
324	rio_init_dbell_res(res, start, end);
325
326	/* Make sure these doorbells aren't in use */
327	if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)
328	< 0) {
329	kfree(res);
330	res = NULL;
331	}
332	}
333
334	return res;
335	}
336
337	/**
338	* rio_release_outb_dbell - release outbound doorbell message range
339	* @rdev: RIO device from which to release the doorbell resource
340	* @res: Doorbell resource to be freed
341	*
342	* Releases ownership of a doorbell message range. Returns 0 if the
343	* request has been satisfied.
344	*/
345	int rio_release_outb_dbell(struct rio_dev rdev, struct resource res)
346	{
347	int rc = release_resource(res);
348
349	kfree(res);
350
351	return rc;
352	}
353
354	/**
355	* rio_request_inb_pwrite - request inbound port-write message service
356	* @rdev: RIO device to which register inbound port-write callback routine
357	* @pwcback: Callback routine to execute when port-write is received
358	*
359	* Binds a port-write callback function to the RapidIO device.
360	* Returns 0 if the request has been satisfied.
361	*/
362	int rio_request_inb_pwrite(struct rio_dev *rdev,
363	int (pwcback)(struct rio_dev rdev, union rio_pw_msg *msg, int step))
364	{
365	int rc = 0;
366
367	spin_lock(&rio_global_list_lock);
368	if (rdev->pwcback != NULL)
369	rc = -ENOMEM;
370	else
371	rdev->pwcback = pwcback;
372
373	spin_unlock(&rio_global_list_lock);
374	return rc;
375	}
376	EXPORT_SYMBOL_GPL(rio_request_inb_pwrite);
377
378	/**
379	* rio_release_inb_pwrite - release inbound port-write message service
380	* @rdev: RIO device which registered for inbound port-write callback
381	*
382	* Removes callback from the rio_dev structure. Returns 0 if the request
383	* has been satisfied.
384	*/
385	int rio_release_inb_pwrite(struct rio_dev *rdev)
386	{
387	int rc = -ENOMEM;
388
389	spin_lock(&rio_global_list_lock);
390	if (rdev->pwcback) {
391	rdev->pwcback = NULL;
392	rc = 0;
393	}
394
395	spin_unlock(&rio_global_list_lock);
396	return rc;
397	}
398	EXPORT_SYMBOL_GPL(rio_release_inb_pwrite);
399
400	/**
401	* rio_mport_get_physefb - Helper function that returns register offset
402	* for Physical Layer Extended Features Block.
403	* @port: Master port to issue transaction
404	* @local: Indicate a local master port or remote device access
405	* @destid: Destination ID of the device
406	* @hopcount: Number of switch hops to the device
407	*/
408	u32
409	rio_mport_get_physefb(struct rio_mport *port, int local,
410	u16 destid, u8 hopcount)
411	{
412	u32 ext_ftr_ptr;
413	u32 ftr_header;
414
415	ext_ftr_ptr = rio_mport_get_efb(port, local, destid, hopcount, 0);
416
417	while (ext_ftr_ptr) {
418	if (local)
419	rio_local_read_config_32(port, ext_ftr_ptr,
420	&ftr_header);
421	else
422	rio_mport_read_config_32(port, destid, hopcount,
423	ext_ftr_ptr, &ftr_header);
424
425	ftr_header = RIO_GET_BLOCK_ID(ftr_header);
426	switch (ftr_header) {
427
428	case RIO_EFB_SER_EP_ID_V13P:
429	case RIO_EFB_SER_EP_REC_ID_V13P:
430	case RIO_EFB_SER_EP_FREE_ID_V13P:
431	case RIO_EFB_SER_EP_ID:
432	case RIO_EFB_SER_EP_REC_ID:
433	case RIO_EFB_SER_EP_FREE_ID:
434	case RIO_EFB_SER_EP_FREC_ID:
435
436	return ext_ftr_ptr;
437
438	default:
439	break;
440	}
441
442	ext_ftr_ptr = rio_mport_get_efb(port, local, destid,
443	hopcount, ext_ftr_ptr);
444	}
445
446	return ext_ftr_ptr;
447	}
448
449	/**
450	* rio_get_comptag - Begin or continue searching for a RIO device by component tag
451	* @comp_tag: RIO component tag to match
452	* @from: Previous RIO device found in search, or %NULL for new search
453	*
454	* Iterates through the list of known RIO devices. If a RIO device is
455	* found with a matching @comp_tag, a pointer to its device
456	* structure is returned. Otherwise, %NULL is returned. A new search
457	* is initiated by passing %NULL to the @from argument. Otherwise, if
458	* @from is not %NULL, searches continue from next device on the global
459	* list.
460	*/
461	struct rio_dev rio_get_comptag(u32 comp_tag, struct rio_dev from)
462	{
463	struct list_head *n;
464	struct rio_dev *rdev;
465
466	spin_lock(&rio_global_list_lock);
467	n = from ? from->global_list.next : rio_devices.next;
468
469	while (n && (n != &rio_devices)) {
470	rdev = rio_dev_g(n);
471	if (rdev->comp_tag == comp_tag)
472	goto exit;
473	n = n->next;
474	}
475	rdev = NULL;
476	exit:
477	spin_unlock(&rio_global_list_lock);
478	return rdev;
479	}
480
481	/**
482	* rio_set_port_lockout - Sets/clears LOCKOUT bit (RIO EM 1.3) for a switch port.
483	* @rdev: Pointer to RIO device control structure
484	* @pnum: Switch port number to set LOCKOUT bit
485	* @lock: Operation : set (=1) or clear (=0)
486	*/
487	int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock)
488	{
489	u32 regval;
490
491	rio_read_config_32(rdev,
492	rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
493	&regval);
494	if (lock)
495	regval \|= RIO_PORT_N_CTL_LOCKOUT;
496	else
497	regval &= ~RIO_PORT_N_CTL_LOCKOUT;
498
499	rio_write_config_32(rdev,
500	rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
501	regval);
502	return 0;
503	}
504
505	/**
506	* rio_chk_dev_route - Validate route to the specified device.
507	* @rdev: RIO device failed to respond
508	* @nrdev: Last active device on the route to rdev
509	* @npnum: nrdev's port number on the route to rdev
510	*
511	* Follows a route to the specified RIO device to determine the last available
512	* device (and corresponding RIO port) on the route.
513	*/
514	static int
515	rio_chk_dev_route(struct rio_dev rdev, struct rio_dev nrdev, int npnum)
516	{
517	u32 result;
518	int p_port, rc = -EIO;
519	struct rio_dev *prev = NULL;
520
521	/* Find switch with failed RIO link */
522	while (rdev->prev && (rdev->prev->pef & RIO_PEF_SWITCH)) {
523	if (!rio_read_config_32(rdev->prev, RIO_DEV_ID_CAR, &result)) {
524	prev = rdev->prev;
525	break;
526	}
527	rdev = rdev->prev;
528	}
529
530	if (prev == NULL)
531	goto err_out;
532
533	p_port = prev->rswitch->route_table[rdev->destid];
534
535	if (p_port != RIO_INVALID_ROUTE) {
536	pr_debug("RIO: link failed on [%s]-P%d\n",
537	rio_name(prev), p_port);
538	*nrdev = prev;
539	*npnum = p_port;
540	rc = 0;
541	} else
542	pr_debug("RIO: failed to trace route to %s\n", rio_name(rdev));
543	err_out:
544	return rc;
545	}
546
547	/**
548	* rio_mport_chk_dev_access - Validate access to the specified device.
549	* @mport: Master port to send transactions
550	* @destid: Device destination ID in network
551	* @hopcount: Number of hops into the network
552	*/
553	int
554	rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount)
555	{
556	int i = 0;
557	u32 tmp;
558
559	while (rio_mport_read_config_32(mport, destid, hopcount,
560	RIO_DEV_ID_CAR, &tmp)) {
561	i++;
562	if (i == RIO_MAX_CHK_RETRY)
563	return -EIO;
564	mdelay(1);
565	}
566
567	return 0;
568	}
569
570	/**
571	* rio_chk_dev_access - Validate access to the specified device.
572	* @rdev: Pointer to RIO device control structure
573	*/
574	static int rio_chk_dev_access(struct rio_dev *rdev)
575	{
576	return rio_mport_chk_dev_access(rdev->net->hport,
577	rdev->destid, rdev->hopcount);
578	}
579
580	/**
581	* rio_get_input_status - Sends a Link-Request/Input-Status control symbol and
582	* returns link-response (if requested).
583	* @rdev: RIO devive to issue Input-status command
584	* @pnum: Device port number to issue the command
585	* @lnkresp: Response from a link partner
586	*/
587	static int
588	rio_get_input_status(struct rio_dev rdev, int pnum, u32 lnkresp)
589	{
590	u32 regval;
591	int checkcount;
592
593	if (lnkresp) {
594	/* Read from link maintenance response register
595	* to clear valid bit */
596	rio_read_config_32(rdev,
597	rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
598	&regval);
599	udelay(50);
600	}
601
602	/* Issue Input-status command */
603	rio_write_config_32(rdev,
604	rdev->phys_efptr + RIO_PORT_N_MNT_REQ_CSR(pnum),
605	RIO_MNT_REQ_CMD_IS);
606
607	/* Exit if the response is not expected */
608	if (lnkresp == NULL)
609	return 0;
610
611	checkcount = 3;
612	while (checkcount--) {
613	udelay(50);
614	rio_read_config_32(rdev,
615	rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
616	&regval);
617	if (regval & RIO_PORT_N_MNT_RSP_RVAL) {
618	*lnkresp = regval;
619	return 0;
620	}
621	}
622
623	return -EIO;
624	}
625
626	/**
627	* rio_clr_err_stopped - Clears port Error-stopped states.
628	* @rdev: Pointer to RIO device control structure
629	* @pnum: Switch port number to clear errors
630	* @err_status: port error status (if 0 reads register from device)
631	*/
632	static int rio_clr_err_stopped(struct rio_dev *rdev, u32 pnum, u32 err_status)
633	{
634	struct rio_dev *nextdev = rdev->rswitch->nextdev[pnum];
635	u32 regval;
636	u32 far_ackid, far_linkstat, near_ackid;
637
638	if (err_status == 0)
639	rio_read_config_32(rdev,
640	rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
641	&err_status);
642
643	if (err_status & RIO_PORT_N_ERR_STS_PW_OUT_ES) {
644	pr_debug("RIO_EM: servicing Output Error-Stopped state\n");
645	/*
646	* Send a Link-Request/Input-Status control symbol
647	*/
648	if (rio_get_input_status(rdev, pnum, &regval)) {
649	pr_debug("RIO_EM: Input-status response timeout\n");
650	goto rd_err;
651	}
652
653	pr_debug("RIO_EM: SP%d Input-status response=0x%08x\n",
654	pnum, regval);
655	far_ackid = (regval & RIO_PORT_N_MNT_RSP_ASTAT) >> 5;
656	far_linkstat = regval & RIO_PORT_N_MNT_RSP_LSTAT;
657	rio_read_config_32(rdev,
658	rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
659	&regval);
660	pr_debug("RIO_EM: SP%d_ACK_STS_CSR=0x%08x\n", pnum, regval);
661	near_ackid = (regval & RIO_PORT_N_ACK_INBOUND) >> 24;
662	pr_debug("RIO_EM: SP%d far_ackID=0x%02x far_linkstat=0x%02x" \
663	" near_ackID=0x%02x\n",
664	pnum, far_ackid, far_linkstat, near_ackid);
665
666	/*
667	* If required, synchronize ackIDs of near and
668	* far sides.
669	*/
670	if ((far_ackid != ((regval & RIO_PORT_N_ACK_OUTSTAND) >> 8)) \|\|
671	(far_ackid != (regval & RIO_PORT_N_ACK_OUTBOUND))) {
672	/* Align near outstanding/outbound ackIDs with
673	* far inbound.
674	*/
675	rio_write_config_32(rdev,
676	rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
677	(near_ackid << 24) \|
678	(far_ackid << 8) \| far_ackid);
679	/* Align far outstanding/outbound ackIDs with
680	* near inbound.
681	*/
682	far_ackid++;
683	if (nextdev)
684	rio_write_config_32(nextdev,
685	nextdev->phys_efptr +
686	RIO_PORT_N_ACK_STS_CSR(RIO_GET_PORT_NUM(nextdev->swpinfo)),
687	(far_ackid << 24) \|
688	(near_ackid << 8) \| near_ackid);
689	else
690	pr_debug("RIO_EM: Invalid nextdev pointer (NULL)\n");
691	}
692	rd_err:
693	rio_read_config_32(rdev,
694	rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
695	&err_status);
696	pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
697	}
698
699	if ((err_status & RIO_PORT_N_ERR_STS_PW_INP_ES) && nextdev) {
700	pr_debug("RIO_EM: servicing Input Error-Stopped state\n");
701	rio_get_input_status(nextdev,
702	RIO_GET_PORT_NUM(nextdev->swpinfo), NULL);
703	udelay(50);
704
705	rio_read_config_32(rdev,
706	rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
707	&err_status);
708	pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
709	}
710
711	return (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES \|
712	RIO_PORT_N_ERR_STS_PW_INP_ES)) ? 1 : 0;
713	}
714
715	/**
716	* rio_inb_pwrite_handler - process inbound port-write message
717	* @pw_msg: pointer to inbound port-write message
718	*
719	* Processes an inbound port-write message. Returns 0 if the request
720	* has been satisfied.
721	*/
722	int rio_inb_pwrite_handler(union rio_pw_msg *pw_msg)
723	{
724	struct rio_dev *rdev;
725	u32 err_status, em_perrdet, em_ltlerrdet;
726	int rc, portnum;
727
728	rdev = rio_get_comptag((pw_msg->em.comptag & RIO_CTAG_UDEVID), NULL);
729	if (rdev == NULL) {
730	/* Device removed or enumeration error */
731	pr_debug("RIO: %s No matching device for CTag 0x%08x\n",
732	__func__, pw_msg->em.comptag);
733	return -EIO;
734	}
735
736	pr_debug("RIO: Port-Write message from %s\n", rio_name(rdev));
737
738	#ifdef DEBUG_PW
739	{
740	u32 i;
741	for (i = 0; i < RIO_PW_MSG_SIZE/sizeof(u32);) {
742	pr_debug("0x%02x: %08x %08x %08x %08x\n",
743	i*4, pw_msg->raw[i], pw_msg->raw[i + 1],
744	pw_msg->raw[i + 2], pw_msg->raw[i + 3]);
745	i += 4;
746	}
747	}
748	#endif
749
750	/* Call an external service function (if such is registered
751	* for this device). This may be the service for endpoints that send
752	* device-specific port-write messages. End-point messages expected
753	* to be handled completely by EP specific device driver.
754	* For switches rc==0 signals that no standard processing required.
755	*/
756	if (rdev->pwcback != NULL) {
757	rc = rdev->pwcback(rdev, pw_msg, 0);
758	if (rc == 0)
759	return 0;
760	}
761
762	portnum = pw_msg->em.is_port & 0xFF;
763
764	/* Check if device and route to it are functional:
765	* Sometimes devices may send PW message(s) just before being
766	* powered down (or link being lost).
767	*/
768	if (rio_chk_dev_access(rdev)) {
769	pr_debug("RIO: device access failed - get link partner\n");
770	/* Scan route to the device and identify failed link.
771	* This will replace device and port reported in PW message.
772	* PW message should not be used after this point.
773	*/
774	if (rio_chk_dev_route(rdev, &rdev, &portnum)) {
775	pr_err("RIO: Route trace for %s failed\n",
776	rio_name(rdev));
777	return -EIO;
778	}
779	pw_msg = NULL;
780	}
781
782	/* For End-point devices processing stops here */
783	if (!(rdev->pef & RIO_PEF_SWITCH))
784	return 0;
785
786	if (rdev->phys_efptr == 0) {
787	pr_err("RIO_PW: Bad switch initialization for %s\n",
788	rio_name(rdev));
789	return 0;
790	}
791
792	/*
793	* Process the port-write notification from switch
794	*/
795	if (rdev->rswitch->em_handle)
796	rdev->rswitch->em_handle(rdev, portnum);
797
798	rio_read_config_32(rdev,
799	rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
800	&err_status);
801	pr_debug("RIO_PW: SP%d_ERR_STS_CSR=0x%08x\n", portnum, err_status);
802
803	if (err_status & RIO_PORT_N_ERR_STS_PORT_OK) {
804
805	if (!(rdev->rswitch->port_ok & (1 << portnum))) {
806	rdev->rswitch->port_ok \|= (1 << portnum);
807	rio_set_port_lockout(rdev, portnum, 0);
808	/* Schedule Insertion Service */
809	pr_debug("RIO_PW: Device Insertion on [%s]-P%d\n",
810	rio_name(rdev), portnum);
811	}
812
813	/* Clear error-stopped states (if reported).
814	* Depending on the link partner state, two attempts
815	* may be needed for successful recovery.
816	*/
817	if (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES \|
818	RIO_PORT_N_ERR_STS_PW_INP_ES)) {
819	if (rio_clr_err_stopped(rdev, portnum, err_status))
820	rio_clr_err_stopped(rdev, portnum, 0);
821	}
822	} else { /* if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT) */
823
824	if (rdev->rswitch->port_ok & (1 << portnum)) {
825	rdev->rswitch->port_ok &= ~(1 << portnum);
826	rio_set_port_lockout(rdev, portnum, 1);
827
828	rio_write_config_32(rdev,
829	rdev->phys_efptr +
830	RIO_PORT_N_ACK_STS_CSR(portnum),
831	RIO_PORT_N_ACK_CLEAR);
832
833	/* Schedule Extraction Service */
834	pr_debug("RIO_PW: Device Extraction on [%s]-P%d\n",
835	rio_name(rdev), portnum);
836	}
837	}
838
839	rio_read_config_32(rdev,
840	rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), &em_perrdet);
841	if (em_perrdet) {
842	pr_debug("RIO_PW: RIO_EM_P%d_ERR_DETECT=0x%08x\n",
843	portnum, em_perrdet);
844	/* Clear EM Port N Error Detect CSR */
845	rio_write_config_32(rdev,
846	rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), 0);
847	}
848
849	rio_read_config_32(rdev,
850	rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, &em_ltlerrdet);
851	if (em_ltlerrdet) {
852	pr_debug("RIO_PW: RIO_EM_LTL_ERR_DETECT=0x%08x\n",
853	em_ltlerrdet);
854	/* Clear EM L/T Layer Error Detect CSR */
855	rio_write_config_32(rdev,
856	rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, 0);
857	}
858
859	/* Clear remaining error bits and Port-Write Pending bit */
860	rio_write_config_32(rdev,
861	rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
862	err_status);
863
864	return 0;
865	}
866	EXPORT_SYMBOL_GPL(rio_inb_pwrite_handler);
867
868	/**
869	* rio_mport_get_efb - get pointer to next extended features block
870	* @port: Master port to issue transaction
871	* @local: Indicate a local master port or remote device access
872	* @destid: Destination ID of the device
873	* @hopcount: Number of switch hops to the device
874	* @from: Offset of current Extended Feature block header (if 0 starts
875	* from ExtFeaturePtr)
876	*/
877	u32
878	rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,
879	u8 hopcount, u32 from)
880	{
881	u32 reg_val;
882
883	if (from == 0) {
884	if (local)
885	rio_local_read_config_32(port, RIO_ASM_INFO_CAR,
886	&reg_val);
887	else
888	rio_mport_read_config_32(port, destid, hopcount,
889	RIO_ASM_INFO_CAR, &reg_val);
890	return reg_val & RIO_EXT_FTR_PTR_MASK;
891	} else {
892	if (local)
893	rio_local_read_config_32(port, from, &reg_val);
894	else
895	rio_mport_read_config_32(port, destid, hopcount,
896	from, &reg_val);
897	return RIO_GET_BLOCK_ID(reg_val);
898	}
899	}
900
901	/**
902	* rio_mport_get_feature - query for devices' extended features
903	* @port: Master port to issue transaction
904	* @local: Indicate a local master port or remote device access
905	* @destid: Destination ID of the device
906	* @hopcount: Number of switch hops to the device
907	* @ftr: Extended feature code
908	*
909	* Tell if a device supports a given RapidIO capability.
910	* Returns the offset of the requested extended feature
911	* block within the device's RIO configuration space or
912	* 0 in case the device does not support it. Possible
913	* values for @ftr:
914	*
915	* %RIO_EFB_PAR_EP_ID LP/LVDS EP Devices
916	*
917	* %RIO_EFB_PAR_EP_REC_ID LP/LVDS EP Recovery Devices
918	*
919	* %RIO_EFB_PAR_EP_FREE_ID LP/LVDS EP Free Devices
920	*
921	* %RIO_EFB_SER_EP_ID LP/Serial EP Devices
922	*
923	* %RIO_EFB_SER_EP_REC_ID LP/Serial EP Recovery Devices
924	*
925	* %RIO_EFB_SER_EP_FREE_ID LP/Serial EP Free Devices
926	*/
927	u32
928	rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
929	u8 hopcount, int ftr)
930	{
931	u32 asm_info, ext_ftr_ptr, ftr_header;
932
933	if (local)
934	rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);
935	else
936	rio_mport_read_config_32(port, destid, hopcount,
937	RIO_ASM_INFO_CAR, &asm_info);
938
939	ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;
940
941	while (ext_ftr_ptr) {
942	if (local)
943	rio_local_read_config_32(port, ext_ftr_ptr,
944	&ftr_header);
945	else
946	rio_mport_read_config_32(port, destid, hopcount,
947	ext_ftr_ptr, &ftr_header);
948	if (RIO_GET_BLOCK_ID(ftr_header) == ftr)
949	return ext_ftr_ptr;
950	if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header)))
951	break;
952	}
953
954	return 0;
955	}
956
957	/**
958	* rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
959	* @vid: RIO vid to match or %RIO_ANY_ID to match all vids
960	* @did: RIO did to match or %RIO_ANY_ID to match all dids
961	* @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids
962	* @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids
963	* @from: Previous RIO device found in search, or %NULL for new search
964	*
965	* Iterates through the list of known RIO devices. If a RIO device is
966	* found with a matching @vid, @did, @asm_vid, @asm_did, the reference
967	* count to the device is incrememted and a pointer to its device
968	* structure is returned. Otherwise, %NULL is returned. A new search
969	* is initiated by passing %NULL to the @from argument. Otherwise, if
970	* @from is not %NULL, searches continue from next device on the global
971	* list. The reference count for @from is always decremented if it is
972	* not %NULL.
973	*/
974	struct rio_dev *rio_get_asm(u16 vid, u16 did,
975	u16 asm_vid, u16 asm_did, struct rio_dev *from)
976	{
977	struct list_head *n;
978	struct rio_dev *rdev;
979
980	WARN_ON(in_interrupt());
981	spin_lock(&rio_global_list_lock);
982	n = from ? from->global_list.next : rio_devices.next;
983
984	while (n && (n != &rio_devices)) {
985	rdev = rio_dev_g(n);
986	if ((vid == RIO_ANY_ID \|\| rdev->vid == vid) &&
987	(did == RIO_ANY_ID \|\| rdev->did == did) &&
988	(asm_vid == RIO_ANY_ID \|\| rdev->asm_vid == asm_vid) &&
989	(asm_did == RIO_ANY_ID \|\| rdev->asm_did == asm_did))
990	goto exit;
991	n = n->next;
992	}
993	rdev = NULL;
994	exit:
995	rio_dev_put(from);
996	rdev = rio_dev_get(rdev);
997	spin_unlock(&rio_global_list_lock);
998	return rdev;
999	}
1000
1001	/**
1002	* rio_get_device - Begin or continue searching for a RIO device by vid/did
1003	* @vid: RIO vid to match or %RIO_ANY_ID to match all vids
1004	* @did: RIO did to match or %RIO_ANY_ID to match all dids
1005	* @from: Previous RIO device found in search, or %NULL for new search
1006	*
1007	* Iterates through the list of known RIO devices. If a RIO device is
1008	* found with a matching @vid and @did, the reference count to the
1009	* device is incrememted and a pointer to its device structure is returned.
1010	* Otherwise, %NULL is returned. A new search is initiated by passing %NULL
1011	* to the @from argument. Otherwise, if @from is not %NULL, searches
1012	* continue from next device on the global list. The reference count for
1013	* @from is always decremented if it is not %NULL.
1014	*/
1015	struct rio_dev rio_get_device(u16 vid, u16 did, struct rio_dev from)
1016	{
1017	return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
1018	}
1019
1020	/**
1021	* rio_std_route_add_entry - Add switch route table entry using standard
1022	* registers defined in RIO specification rev.1.3
1023	* @mport: Master port to issue transaction
1024	* @destid: Destination ID of the device
1025	* @hopcount: Number of switch hops to the device
1026	* @table: routing table ID (global or port-specific)
1027	* @route_destid: destID entry in the RT
1028	* @route_port: destination port for specified destID
1029	*/
1030	int rio_std_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1031	u16 table, u16 route_destid, u8 route_port)
1032	{
1033	if (table == RIO_GLOBAL_TABLE) {
1034	rio_mport_write_config_32(mport, destid, hopcount,
1035	RIO_STD_RTE_CONF_DESTID_SEL_CSR,
1036	(u32)route_destid);
1037	rio_mport_write_config_32(mport, destid, hopcount,
1038	RIO_STD_RTE_CONF_PORT_SEL_CSR,
1039	(u32)route_port);
1040	}
1041
1042	udelay(10);
1043	return 0;
1044	}
1045
1046	/**
1047	* rio_std_route_get_entry - Read switch route table entry (port number)
1048	* associated with specified destID using standard registers defined in RIO
1049	* specification rev.1.3
1050	* @mport: Master port to issue transaction
1051	* @destid: Destination ID of the device
1052	* @hopcount: Number of switch hops to the device
1053	* @table: routing table ID (global or port-specific)
1054	* @route_destid: destID entry in the RT
1055	* @route_port: returned destination port for specified destID
1056	*/
1057	int rio_std_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1058	u16 table, u16 route_destid, u8 *route_port)
1059	{
1060	u32 result;
1061
1062	if (table == RIO_GLOBAL_TABLE) {
1063	rio_mport_write_config_32(mport, destid, hopcount,
1064	RIO_STD_RTE_CONF_DESTID_SEL_CSR, route_destid);
1065	rio_mport_read_config_32(mport, destid, hopcount,
1066	RIO_STD_RTE_CONF_PORT_SEL_CSR, &result);
1067
1068	*route_port = (u8)result;
1069	}
1070
1071	return 0;
1072	}
1073
1074	/**
1075	* rio_std_route_clr_table - Clear swotch route table using standard registers
1076	* defined in RIO specification rev.1.3.
1077	* @mport: Master port to issue transaction
1078	* @destid: Destination ID of the device
1079	* @hopcount: Number of switch hops to the device
1080	* @table: routing table ID (global or port-specific)
1081	*/
1082	int rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
1083	u16 table)
1084	{
1085	u32 max_destid = 0xff;
1086	u32 i, pef, id_inc = 1, ext_cfg = 0;
1087	u32 port_sel = RIO_INVALID_ROUTE;
1088
1089	if (table == RIO_GLOBAL_TABLE) {
1090	rio_mport_read_config_32(mport, destid, hopcount,
1091	RIO_PEF_CAR, &pef);
1092
1093	if (mport->sys_size) {
1094	rio_mport_read_config_32(mport, destid, hopcount,
1095	RIO_SWITCH_RT_LIMIT,
1096	&max_destid);
1097	max_destid &= RIO_RT_MAX_DESTID;
1098	}
1099
1100	if (pef & RIO_PEF_EXT_RT) {
1101	ext_cfg = 0x80000000;
1102	id_inc = 4;
1103	port_sel = (RIO_INVALID_ROUTE << 24) \|
1104	(RIO_INVALID_ROUTE << 16) \|
1105	(RIO_INVALID_ROUTE << 8) \|
1106	RIO_INVALID_ROUTE;
1107	}
1108
1109	for (i = 0; i <= max_destid;) {
1110	rio_mport_write_config_32(mport, destid, hopcount,
1111	RIO_STD_RTE_CONF_DESTID_SEL_CSR,
1112	ext_cfg \| i);
1113	rio_mport_write_config_32(mport, destid, hopcount,
1114	RIO_STD_RTE_CONF_PORT_SEL_CSR,
1115	port_sel);
1116	i += id_inc;
1117	}
1118	}
1119
1120	udelay(10);
1121	return 0;
1122	}
1123
1124	#ifdef CONFIG_RAPIDIO_DMA_ENGINE
1125
1126	static bool rio_chan_filter(struct dma_chan chan, void arg)
1127	{
1128	struct rio_dev *rdev = arg;
1129
1130	/* Check that DMA device belongs to the right MPORT */
1131	return (rdev->net->hport ==
1132	container_of(chan->device, struct rio_mport, dma));
1133	}
1134
1135	/**
1136	* rio_request_dma - request RapidIO capable DMA channel that supports
1137	* specified target RapidIO device.
1138	* @rdev: RIO device control structure
1139	*
1140	* Returns pointer to allocated DMA channel or NULL if failed.
1141	*/
1142	struct dma_chan rio_request_dma(struct rio_dev rdev)
1143	{
1144	dma_cap_mask_t mask;
1145	struct dma_chan *dchan;
1146
1147	dma_cap_zero(mask);
1148	dma_cap_set(DMA_SLAVE, mask);
1149	dchan = dma_request_channel(mask, rio_chan_filter, rdev);
1150
1151	return dchan;
1152	}
1153	EXPORT_SYMBOL_GPL(rio_request_dma);
1154
1155	/**
1156	* rio_release_dma - release specified DMA channel
1157	* @dchan: DMA channel to release
1158	*/
1159	void rio_release_dma(struct dma_chan *dchan)
1160	{
1161	dma_release_channel(dchan);
1162	}
1163	EXPORT_SYMBOL_GPL(rio_release_dma);
1164
1165	/**
1166	* rio_dma_prep_slave_sg - RapidIO specific wrapper
1167	* for device_prep_slave_sg callback defined by DMAENGINE.
1168	* @rdev: RIO device control structure
1169	* @dchan: DMA channel to configure
1170	* @data: RIO specific data descriptor
1171	* @direction: DMA data transfer direction (TO or FROM the device)
1172	* @flags: dmaengine defined flags
1173	*
1174	* Initializes RapidIO capable DMA channel for the specified data transfer.
1175	* Uses DMA channel private extension to pass information related to remote
1176	* target RIO device.
1177	* Returns pointer to DMA transaction descriptor or NULL if failed.
1178	*/
1179	struct dma_async_tx_descriptor rio_dma_prep_slave_sg(struct rio_dev rdev,
1180	struct dma_chan dchan, struct rio_dma_data data,
1181	enum dma_transfer_direction direction, unsigned long flags)
1182	{
1183	struct dma_async_tx_descriptor *txd = NULL;
1184	struct rio_dma_ext rio_ext;
1185
1186	if (dchan->device->device_prep_slave_sg == NULL) {
1187	pr_err("%s: prep_rio_sg == NULL\n", __func__);
1188	return NULL;
1189	}
1190
1191	rio_ext.destid = rdev->destid;
1192	rio_ext.rio_addr_u = data->rio_addr_u;
1193	rio_ext.rio_addr = data->rio_addr;
1194	rio_ext.wr_type = data->wr_type;
1195
1196	txd = dmaengine_prep_rio_sg(dchan, data->sg, data->sg_len,
1197	direction, flags, &rio_ext);
1198
1199	return txd;
1200	}
1201	EXPORT_SYMBOL_GPL(rio_dma_prep_slave_sg);
1202
1203	#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1204
1205	static void rio_fixup_device(struct rio_dev *dev)
1206	{
1207	}
1208
1209	static int __devinit rio_init(void)
1210	{
1211	struct rio_dev *dev = NULL;
1212
1213	while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
1214	rio_fixup_device(dev);
1215	}
1216	return 0;
1217	}
1218
1219	int __devinit rio_init_mports(void)
1220	{
1221	struct rio_mport *port;
1222
1223	list_for_each_entry(port, &rio_mports, node) {
1224	if (port->host_deviceid >= 0)
1225	rio_enum_mport(port);
1226	else
1227	rio_disc_mport(port);
1228	}
1229
1230	rio_init();
1231
1232	return 0;
1233	}
1234
1235	device_initcall_sync(rio_init_mports);
1236
1237	static int hdids[RIO_MAX_MPORTS + 1];
1238
1239	static int rio_get_hdid(int index)
1240	{
1241	if (!hdids[0] \|\| hdids[0] <= index \|\| index >= RIO_MAX_MPORTS)
1242	return -1;
1243
1244	return hdids[index + 1];
1245	}
1246
1247	static int rio_hdid_setup(char *str)
1248	{
1249	(void)get_options(str, ARRAY_SIZE(hdids), hdids);
1250	return 1;
1251	}
1252
1253	__setup("riohdid=", rio_hdid_setup);
1254
1255	int rio_register_mport(struct rio_mport *port)
1256	{
1257	if (next_portid >= RIO_MAX_MPORTS) {
1258	pr_err("RIO: reached specified max number of mports\n");
1259	return 1;
1260	}
1261
1262	port->id = next_portid++;
1263	port->host_deviceid = rio_get_hdid(port->id);
1264	list_add_tail(&port->node, &rio_mports);
1265	return 0;
1266	}
1267
1268	EXPORT_SYMBOL_GPL(rio_local_get_device_id);
1269	EXPORT_SYMBOL_GPL(rio_get_device);
1270	EXPORT_SYMBOL_GPL(rio_get_asm);
1271	EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
1272	EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
1273	EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
1274	EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
1275	EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
1276	EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
1277	EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
1278	EXPORT_SYMBOL_GPL(rio_release_outb_mbox);
1279

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