cris: add arch/cris/include/asm/serial.h
[linux-2.6/next.git] / drivers / rapidio / rio.c
blob86c9a091a2ffdbfb3cac0868f17824ee9f4e5b6d
1 /*
2 * RapidIO interconnect services
3 * (RapidIO Interconnect Specification, http://www.rapidio.org)
5 * Copyright 2005 MontaVista Software, Inc.
6 * Matt Porter <mporter@kernel.crashing.org>
8 * Copyright 2009 Integrated Device Technology, Inc.
9 * Alex Bounine <alexandre.bounine@idt.com>
10 * - Added Port-Write/Error Management initialization and handling
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.
18 #include <linux/types.h>
19 #include <linux/kernel.h>
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>
32 #include "rio.h"
34 static LIST_HEAD(rio_mports);
35 static unsigned char next_portid;
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
41 * Reads the base/extended device id from the local device
42 * implementing the master port. Returns the 8/16-bit device
43 * id.
45 u16 rio_local_get_device_id(struct rio_mport *port)
47 u32 result;
49 rio_local_read_config_32(port, RIO_DID_CSR, &result);
51 return (RIO_GET_DID(port->sys_size, result));
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
62 * Requests ownership of an inbound mailbox resource and binds
63 * a callback function to the resource. Returns %0 on success.
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))
72 int rc = -ENOSYS;
73 struct resource *res;
75 if (mport->ops->open_inb_mbox == NULL)
76 goto out;
78 res = kmalloc(sizeof(struct resource), GFP_KERNEL);
80 if (res) {
81 rio_init_mbox_res(res, mbox, mbox);
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;
91 mport->inb_msg[mbox].res = res;
93 /* Hook the inbound message callback */
94 mport->inb_msg[mbox].mcback = minb;
96 rc = mport->ops->open_inb_mbox(mport, dev_id, mbox, entries);
97 } else
98 rc = -ENOMEM;
100 out:
101 return rc;
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
109 * Releases ownership of an inbound mailbox resource. Returns 0
110 * if the request has been satisfied.
112 int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
114 if (mport->ops->close_inb_mbox) {
115 mport->ops->close_inb_mbox(mport, mbox);
117 /* Release the mailbox resource */
118 return release_resource(mport->inb_msg[mbox].res);
119 } else
120 return -ENOSYS;
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
131 * Requests ownership of an outbound mailbox resource and binds
132 * a callback function to the resource. Returns 0 on success.
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))
140 int rc = -ENOSYS;
141 struct resource *res;
143 if (mport->ops->open_outb_mbox == NULL)
144 goto out;
146 res = kmalloc(sizeof(struct resource), GFP_KERNEL);
148 if (res) {
149 rio_init_mbox_res(res, mbox, mbox);
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;
159 mport->outb_msg[mbox].res = res;
161 /* Hook the inbound message callback */
162 mport->outb_msg[mbox].mcback = moutb;
164 rc = mport->ops->open_outb_mbox(mport, dev_id, mbox, entries);
165 } else
166 rc = -ENOMEM;
168 out:
169 return rc;
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
177 * Releases ownership of an inbound mailbox resource. Returns 0
178 * if the request has been satisfied.
180 int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
182 if (mport->ops->close_outb_mbox) {
183 mport->ops->close_outb_mbox(mport, mbox);
185 /* Release the mailbox resource */
186 return release_resource(mport->outb_msg[mbox].res);
187 } else
188 return -ENOSYS;
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
198 * Adds a doorbell resource/callback pair into a port's
199 * doorbell event list. Returns 0 if the request has been
200 * satisfied.
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))
207 int rc = 0;
208 struct rio_dbell *dbell;
210 if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
211 rc = -ENOMEM;
212 goto out;
215 dbell->res = res;
216 dbell->dinb = dinb;
217 dbell->dev_id = dev_id;
219 list_add_tail(&dbell->node, &mport->dbells);
221 out:
222 return rc;
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
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.
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))
244 int rc = 0;
246 struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
248 if (res) {
249 rio_init_dbell_res(res, start, end);
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;
259 /* Hook the doorbell callback */
260 rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);
261 } else
262 rc = -ENOMEM;
264 out:
265 return rc;
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
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.
278 int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
280 int rc = 0, found = 0;
281 struct rio_dbell *dbell;
283 list_for_each_entry(dbell, &mport->dbells, node) {
284 if ((dbell->res->start == start) && (dbell->res->end == end)) {
285 found = 1;
286 break;
290 /* If we can't find an exact match, fail */
291 if (!found) {
292 rc = -EINVAL;
293 goto out;
296 /* Delete from list */
297 list_del(&dbell->node);
299 /* Release the doorbell resource */
300 rc = release_resource(dbell->res);
302 /* Free the doorbell event */
303 kfree(dbell);
305 out:
306 return rc;
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
315 * Requests ownership of a doorbell message range. Returns a resource
316 * if the request has been satisfied or %NULL on failure.
318 struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start,
319 u16 end)
321 struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
323 if (res) {
324 rio_init_dbell_res(res, start, end);
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;
334 return res;
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
342 * Releases ownership of a doorbell message range. Returns 0 if the
343 * request has been satisfied.
345 int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res)
347 int rc = release_resource(res);
349 kfree(res);
351 return rc;
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
359 * Binds a port-write callback function to the RapidIO device.
360 * Returns 0 if the request has been satisfied.
362 int rio_request_inb_pwrite(struct rio_dev *rdev,
363 int (*pwcback)(struct rio_dev *rdev, union rio_pw_msg *msg, int step))
365 int rc = 0;
367 spin_lock(&rio_global_list_lock);
368 if (rdev->pwcback != NULL)
369 rc = -ENOMEM;
370 else
371 rdev->pwcback = pwcback;
373 spin_unlock(&rio_global_list_lock);
374 return rc;
376 EXPORT_SYMBOL_GPL(rio_request_inb_pwrite);
379 * rio_release_inb_pwrite - release inbound port-write message service
380 * @rdev: RIO device which registered for inbound port-write callback
382 * Removes callback from the rio_dev structure. Returns 0 if the request
383 * has been satisfied.
385 int rio_release_inb_pwrite(struct rio_dev *rdev)
387 int rc = -ENOMEM;
389 spin_lock(&rio_global_list_lock);
390 if (rdev->pwcback) {
391 rdev->pwcback = NULL;
392 rc = 0;
395 spin_unlock(&rio_global_list_lock);
396 return rc;
398 EXPORT_SYMBOL_GPL(rio_release_inb_pwrite);
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
409 rio_mport_get_physefb(struct rio_mport *port, int local,
410 u16 destid, u8 hopcount)
412 u32 ext_ftr_ptr;
413 u32 ftr_header;
415 ext_ftr_ptr = rio_mport_get_efb(port, local, destid, hopcount, 0);
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);
425 ftr_header = RIO_GET_BLOCK_ID(ftr_header);
426 switch (ftr_header) {
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:
436 return ext_ftr_ptr;
438 default:
439 break;
442 ext_ftr_ptr = rio_mport_get_efb(port, local, destid,
443 hopcount, ext_ftr_ptr);
446 return ext_ftr_ptr;
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
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.
461 struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from)
463 struct list_head *n;
464 struct rio_dev *rdev;
466 spin_lock(&rio_global_list_lock);
467 n = from ? from->global_list.next : rio_devices.next;
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;
475 rdev = NULL;
476 exit:
477 spin_unlock(&rio_global_list_lock);
478 return rdev;
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)
487 int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock)
489 u32 regval;
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;
499 rio_write_config_32(rdev,
500 rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
501 regval);
502 return 0;
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
511 * Follows a route to the specified RIO device to determine the last available
512 * device (and corresponding RIO port) on the route.
514 static int
515 rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum)
517 u32 result;
518 int p_port, rc = -EIO;
519 struct rio_dev *prev = NULL;
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;
527 rdev = rdev->prev;
530 if (prev == NULL)
531 goto err_out;
533 p_port = prev->rswitch->route_table[rdev->destid];
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;
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
554 rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount)
556 int i = 0;
557 u32 tmp;
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);
567 return 0;
571 * rio_chk_dev_access - Validate access to the specified device.
572 * @rdev: Pointer to RIO device control structure
574 static int rio_chk_dev_access(struct rio_dev *rdev)
576 return rio_mport_chk_dev_access(rdev->net->hport,
577 rdev->destid, rdev->hopcount);
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
587 static int
588 rio_get_input_status(struct rio_dev *rdev, int pnum, u32 *lnkresp)
590 u32 regval;
591 int checkcount;
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);
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);
607 /* Exit if the response is not expected */
608 if (lnkresp == NULL)
609 return 0;
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;
623 return -EIO;
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)
632 static int rio_clr_err_stopped(struct rio_dev *rdev, u32 pnum, u32 err_status)
634 struct rio_dev *nextdev = rdev->rswitch->nextdev[pnum];
635 u32 regval;
636 u32 far_ackid, far_linkstat, near_ackid;
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);
643 if (err_status & RIO_PORT_N_ERR_STS_PW_OUT_ES) {
644 pr_debug("RIO_EM: servicing Output Error-Stopped state\n");
646 * Send a Link-Request/Input-Status control symbol
648 if (rio_get_input_status(rdev, pnum, &regval)) {
649 pr_debug("RIO_EM: Input-status response timeout\n");
650 goto rd_err;
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);
667 * If required, synchronize ackIDs of near and
668 * far sides.
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.
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.
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");
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);
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);
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);
711 return (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
712 RIO_PORT_N_ERR_STS_PW_INP_ES)) ? 1 : 0;
716 * rio_inb_pwrite_handler - process inbound port-write message
717 * @pw_msg: pointer to inbound port-write message
719 * Processes an inbound port-write message. Returns 0 if the request
720 * has been satisfied.
722 int rio_inb_pwrite_handler(union rio_pw_msg *pw_msg)
724 struct rio_dev *rdev;
725 u32 err_status, em_perrdet, em_ltlerrdet;
726 int rc, portnum;
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;
736 pr_debug("RIO: Port-Write message from %s\n", rio_name(rdev));
738 #ifdef DEBUG_PW
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;
748 #endif
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.
756 if (rdev->pwcback != NULL) {
757 rc = rdev->pwcback(rdev, pw_msg, 0);
758 if (rc == 0)
759 return 0;
762 portnum = pw_msg->em.is_port & 0xFF;
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).
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.
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;
779 pw_msg = NULL;
782 /* For End-point devices processing stops here */
783 if (!(rdev->pef & RIO_PEF_SWITCH))
784 return 0;
786 if (rdev->phys_efptr == 0) {
787 pr_err("RIO_PW: Bad switch initialization for %s\n",
788 rio_name(rdev));
789 return 0;
793 * Process the port-write notification from switch
795 if (rdev->rswitch->em_handle)
796 rdev->rswitch->em_handle(rdev, portnum);
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);
803 if (err_status & RIO_PORT_N_ERR_STS_PORT_OK) {
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);
813 /* Clear error-stopped states (if reported).
814 * Depending on the link partner state, two attempts
815 * may be needed for successful recovery.
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);
822 } else { /* if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT) */
824 if (rdev->rswitch->port_ok & (1 << portnum)) {
825 rdev->rswitch->port_ok &= ~(1 << portnum);
826 rio_set_port_lockout(rdev, portnum, 1);
828 rio_write_config_32(rdev,
829 rdev->phys_efptr +
830 RIO_PORT_N_ACK_STS_CSR(portnum),
831 RIO_PORT_N_ACK_CLEAR);
833 /* Schedule Extraction Service */
834 pr_debug("RIO_PW: Device Extraction on [%s]-P%d\n",
835 rio_name(rdev), portnum);
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);
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);
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);
864 return 0;
866 EXPORT_SYMBOL_GPL(rio_inb_pwrite_handler);
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)
878 rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,
879 u8 hopcount, u32 from)
881 u32 reg_val;
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);
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
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:
915 * %RIO_EFB_PAR_EP_ID LP/LVDS EP Devices
917 * %RIO_EFB_PAR_EP_REC_ID LP/LVDS EP Recovery Devices
919 * %RIO_EFB_PAR_EP_FREE_ID LP/LVDS EP Free Devices
921 * %RIO_EFB_SER_EP_ID LP/Serial EP Devices
923 * %RIO_EFB_SER_EP_REC_ID LP/Serial EP Recovery Devices
925 * %RIO_EFB_SER_EP_FREE_ID LP/Serial EP Free Devices
928 rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
929 u8 hopcount, int ftr)
931 u32 asm_info, ext_ftr_ptr, ftr_header;
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);
939 ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;
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;
954 return 0;
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
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.
974 struct rio_dev *rio_get_asm(u16 vid, u16 did,
975 u16 asm_vid, u16 asm_did, struct rio_dev *from)
977 struct list_head *n;
978 struct rio_dev *rdev;
980 WARN_ON(in_interrupt());
981 spin_lock(&rio_global_list_lock);
982 n = from ? from->global_list.next : rio_devices.next;
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;
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;
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
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.
1015 struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from)
1017 return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
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
1030 int rio_std_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1031 u16 table, u16 route_destid, u8 route_port)
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);
1042 udelay(10);
1043 return 0;
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
1057 int rio_std_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1058 u16 table, u16 route_destid, u8 *route_port)
1060 u32 result;
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);
1068 *route_port = (u8)result;
1071 return 0;
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)
1082 int rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
1083 u16 table)
1085 u32 max_destid = 0xff;
1086 u32 i, pef, id_inc = 1, ext_cfg = 0;
1087 u32 port_sel = RIO_INVALID_ROUTE;
1089 if (table == RIO_GLOBAL_TABLE) {
1090 rio_mport_read_config_32(mport, destid, hopcount,
1091 RIO_PEF_CAR, &pef);
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;
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;
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;
1120 udelay(10);
1121 return 0;
1124 static void rio_fixup_device(struct rio_dev *dev)
1128 static int __devinit rio_init(void)
1130 struct rio_dev *dev = NULL;
1132 while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
1133 rio_fixup_device(dev);
1135 return 0;
1138 int __devinit rio_init_mports(void)
1140 struct rio_mport *port;
1142 list_for_each_entry(port, &rio_mports, node) {
1143 if (port->host_deviceid >= 0)
1144 rio_enum_mport(port);
1145 else
1146 rio_disc_mport(port);
1149 rio_init();
1151 return 0;
1154 device_initcall_sync(rio_init_mports);
1156 static int hdids[RIO_MAX_MPORTS + 1];
1158 static int rio_get_hdid(int index)
1160 if (!hdids[0] || hdids[0] <= index || index >= RIO_MAX_MPORTS)
1161 return -1;
1163 return hdids[index + 1];
1166 static int rio_hdid_setup(char *str)
1168 (void)get_options(str, ARRAY_SIZE(hdids), hdids);
1169 return 1;
1172 __setup("riohdid=", rio_hdid_setup);
1174 int rio_register_mport(struct rio_mport *port)
1176 if (next_portid >= RIO_MAX_MPORTS) {
1177 pr_err("RIO: reached specified max number of mports\n");
1178 return 1;
1181 port->id = next_portid++;
1182 port->host_deviceid = rio_get_hdid(port->id);
1183 list_add_tail(&port->node, &rio_mports);
1184 return 0;
1187 EXPORT_SYMBOL_GPL(rio_local_get_device_id);
1188 EXPORT_SYMBOL_GPL(rio_get_device);
1189 EXPORT_SYMBOL_GPL(rio_get_asm);
1190 EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
1191 EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
1192 EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
1193 EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
1194 EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
1195 EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
1196 EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
1197 EXPORT_SYMBOL_GPL(rio_release_outb_mbox);