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 - 2013 Integrated Device Technology, Inc.
9 * Alex Bounine <alexandre.bounine@idt.com>
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
17 #include <linux/types.h>
18 #include <linux/kernel.h>
20 #include <linux/delay.h>
21 #include <linux/init.h>
22 #include <linux/rio.h>
23 #include <linux/rio_drv.h>
24 #include <linux/rio_ids.h>
25 #include <linux/rio_regs.h>
26 #include <linux/module.h>
27 #include <linux/spinlock.h>
28 #include <linux/slab.h>
29 #include <linux/interrupt.h>
34 * struct rio_pwrite - RIO portwrite event
35 * @node: Node in list of doorbell events
36 * @pwcback: Doorbell event callback
37 * @context: Handler specific context to pass on event
40 struct list_head node;
42 int (*pwcback)(struct rio_mport *mport, void *context,
43 union rio_pw_msg *msg, int step);
47 MODULE_DESCRIPTION("RapidIO Subsystem Core");
48 MODULE_AUTHOR("Matt Porter <mporter@kernel.crashing.org>");
49 MODULE_AUTHOR("Alexandre Bounine <alexandre.bounine@idt.com>");
50 MODULE_LICENSE("GPL");
52 static int hdid[RIO_MAX_MPORTS];
54 module_param_array(hdid, int, &ids_num, 0);
55 MODULE_PARM_DESC(hdid,
56 "Destination ID assignment to local RapidIO controllers");
58 static LIST_HEAD(rio_devices);
59 static LIST_HEAD(rio_nets);
60 static DEFINE_SPINLOCK(rio_global_list_lock);
62 static LIST_HEAD(rio_mports);
63 static LIST_HEAD(rio_scans);
64 static DEFINE_MUTEX(rio_mport_list_lock);
65 static unsigned char next_portid;
66 static DEFINE_SPINLOCK(rio_mmap_lock);
69 * rio_local_get_device_id - Get the base/extended device id for a port
70 * @port: RIO master port from which to get the deviceid
72 * Reads the base/extended device id from the local device
73 * implementing the master port. Returns the 8/16-bit device
76 u16 rio_local_get_device_id(struct rio_mport *port)
80 rio_local_read_config_32(port, RIO_DID_CSR, &result);
82 return (RIO_GET_DID(port->sys_size, result));
86 * rio_query_mport - Query mport device attributes
87 * @port: mport device to query
88 * @mport_attr: mport attributes data structure
90 * Returns attributes of specified mport through the
91 * pointer to attributes data structure.
93 int rio_query_mport(struct rio_mport *port,
94 struct rio_mport_attr *mport_attr)
96 if (!port->ops->query_mport)
98 return port->ops->query_mport(port, mport_attr);
100 EXPORT_SYMBOL(rio_query_mport);
103 * rio_alloc_net- Allocate and initialize a new RIO network data structure
104 * @mport: Master port associated with the RIO network
106 * Allocates a RIO network structure, initializes per-network
107 * list heads, and adds the associated master port to the
108 * network list of associated master ports. Returns a
109 * RIO network pointer on success or %NULL on failure.
111 struct rio_net *rio_alloc_net(struct rio_mport *mport)
115 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
117 INIT_LIST_HEAD(&net->node);
118 INIT_LIST_HEAD(&net->devices);
119 INIT_LIST_HEAD(&net->switches);
120 INIT_LIST_HEAD(&net->mports);
125 EXPORT_SYMBOL_GPL(rio_alloc_net);
127 int rio_add_net(struct rio_net *net)
131 err = device_register(&net->dev);
134 spin_lock(&rio_global_list_lock);
135 list_add_tail(&net->node, &rio_nets);
136 spin_unlock(&rio_global_list_lock);
140 EXPORT_SYMBOL_GPL(rio_add_net);
142 void rio_free_net(struct rio_net *net)
144 spin_lock(&rio_global_list_lock);
145 if (!list_empty(&net->node))
146 list_del(&net->node);
147 spin_unlock(&rio_global_list_lock);
150 device_unregister(&net->dev);
152 EXPORT_SYMBOL_GPL(rio_free_net);
155 * rio_local_set_device_id - Set the base/extended device id for a port
156 * @port: RIO master port
157 * @did: Device ID value to be written
159 * Writes the base/extended device id from a device.
161 void rio_local_set_device_id(struct rio_mport *port, u16 did)
163 rio_local_write_config_32(port, RIO_DID_CSR,
164 RIO_SET_DID(port->sys_size, did));
166 EXPORT_SYMBOL_GPL(rio_local_set_device_id);
169 * rio_add_device- Adds a RIO device to the device model
172 * Adds the RIO device to the global device list and adds the RIO
173 * device to the RIO device list. Creates the generic sysfs nodes
176 int rio_add_device(struct rio_dev *rdev)
180 atomic_set(&rdev->state, RIO_DEVICE_RUNNING);
181 err = device_register(&rdev->dev);
185 spin_lock(&rio_global_list_lock);
186 list_add_tail(&rdev->global_list, &rio_devices);
188 list_add_tail(&rdev->net_list, &rdev->net->devices);
189 if (rdev->pef & RIO_PEF_SWITCH)
190 list_add_tail(&rdev->rswitch->node,
191 &rdev->net->switches);
193 spin_unlock(&rio_global_list_lock);
195 rio_create_sysfs_dev_files(rdev);
199 EXPORT_SYMBOL_GPL(rio_add_device);
202 * rio_del_device - removes a RIO device from the device model
204 * @state: device state to set during removal process
206 * Removes the RIO device to the kernel device list and subsystem's device list.
207 * Clears sysfs entries for the removed device.
209 void rio_del_device(struct rio_dev *rdev, enum rio_device_state state)
211 pr_debug("RIO: %s: removing %s\n", __func__, rio_name(rdev));
212 atomic_set(&rdev->state, state);
213 spin_lock(&rio_global_list_lock);
214 list_del(&rdev->global_list);
216 list_del(&rdev->net_list);
217 if (rdev->pef & RIO_PEF_SWITCH) {
218 list_del(&rdev->rswitch->node);
219 kfree(rdev->rswitch->route_table);
222 spin_unlock(&rio_global_list_lock);
223 rio_remove_sysfs_dev_files(rdev);
224 device_unregister(&rdev->dev);
226 EXPORT_SYMBOL_GPL(rio_del_device);
229 * rio_request_inb_mbox - request inbound mailbox service
230 * @mport: RIO master port from which to allocate the mailbox resource
231 * @dev_id: Device specific pointer to pass on event
232 * @mbox: Mailbox number to claim
233 * @entries: Number of entries in inbound mailbox queue
234 * @minb: Callback to execute when inbound message is received
236 * Requests ownership of an inbound mailbox resource and binds
237 * a callback function to the resource. Returns %0 on success.
239 int rio_request_inb_mbox(struct rio_mport *mport,
243 void (*minb) (struct rio_mport * mport, void *dev_id, int mbox,
247 struct resource *res;
249 if (mport->ops->open_inb_mbox == NULL)
252 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
255 rio_init_mbox_res(res, mbox, mbox);
257 /* Make sure this mailbox isn't in use */
259 request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],
265 mport->inb_msg[mbox].res = res;
267 /* Hook the inbound message callback */
268 mport->inb_msg[mbox].mcback = minb;
270 rc = mport->ops->open_inb_mbox(mport, dev_id, mbox, entries);
279 * rio_release_inb_mbox - release inbound mailbox message service
280 * @mport: RIO master port from which to release the mailbox resource
281 * @mbox: Mailbox number to release
283 * Releases ownership of an inbound mailbox resource. Returns 0
284 * if the request has been satisfied.
286 int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
288 if (mport->ops->close_inb_mbox) {
289 mport->ops->close_inb_mbox(mport, mbox);
291 /* Release the mailbox resource */
292 return release_resource(mport->inb_msg[mbox].res);
298 * rio_request_outb_mbox - request outbound mailbox service
299 * @mport: RIO master port from which to allocate the mailbox resource
300 * @dev_id: Device specific pointer to pass on event
301 * @mbox: Mailbox number to claim
302 * @entries: Number of entries in outbound mailbox queue
303 * @moutb: Callback to execute when outbound message is sent
305 * Requests ownership of an outbound mailbox resource and binds
306 * a callback function to the resource. Returns 0 on success.
308 int rio_request_outb_mbox(struct rio_mport *mport,
312 void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot))
315 struct resource *res;
317 if (mport->ops->open_outb_mbox == NULL)
320 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
323 rio_init_mbox_res(res, mbox, mbox);
325 /* Make sure this outbound mailbox isn't in use */
327 request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],
333 mport->outb_msg[mbox].res = res;
335 /* Hook the inbound message callback */
336 mport->outb_msg[mbox].mcback = moutb;
338 rc = mport->ops->open_outb_mbox(mport, dev_id, mbox, entries);
347 * rio_release_outb_mbox - release outbound mailbox message service
348 * @mport: RIO master port from which to release the mailbox resource
349 * @mbox: Mailbox number to release
351 * Releases ownership of an inbound mailbox resource. Returns 0
352 * if the request has been satisfied.
354 int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
356 if (mport->ops->close_outb_mbox) {
357 mport->ops->close_outb_mbox(mport, mbox);
359 /* Release the mailbox resource */
360 return release_resource(mport->outb_msg[mbox].res);
366 * rio_setup_inb_dbell - bind inbound doorbell callback
367 * @mport: RIO master port to bind the doorbell callback
368 * @dev_id: Device specific pointer to pass on event
369 * @res: Doorbell message resource
370 * @dinb: Callback to execute when doorbell is received
372 * Adds a doorbell resource/callback pair into a port's
373 * doorbell event list. Returns 0 if the request has been
377 rio_setup_inb_dbell(struct rio_mport *mport, void *dev_id, struct resource *res,
378 void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, u16 dst,
382 struct rio_dbell *dbell;
384 if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
391 dbell->dev_id = dev_id;
393 mutex_lock(&mport->lock);
394 list_add_tail(&dbell->node, &mport->dbells);
395 mutex_unlock(&mport->lock);
402 * rio_request_inb_dbell - request inbound doorbell message service
403 * @mport: RIO master port from which to allocate the doorbell resource
404 * @dev_id: Device specific pointer to pass on event
405 * @start: Doorbell info range start
406 * @end: Doorbell info range end
407 * @dinb: Callback to execute when doorbell is received
409 * Requests ownership of an inbound doorbell resource and binds
410 * a callback function to the resource. Returns 0 if the request
411 * has been satisfied.
413 int rio_request_inb_dbell(struct rio_mport *mport,
417 void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src,
422 struct resource *res = kzalloc(sizeof(struct resource), GFP_KERNEL);
425 rio_init_dbell_res(res, start, end);
427 /* Make sure these doorbells aren't in use */
429 request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],
435 /* Hook the doorbell callback */
436 rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);
445 * rio_release_inb_dbell - release inbound doorbell message service
446 * @mport: RIO master port from which to release the doorbell resource
447 * @start: Doorbell info range start
448 * @end: Doorbell info range end
450 * Releases ownership of an inbound doorbell resource and removes
451 * callback from the doorbell event list. Returns 0 if the request
452 * has been satisfied.
454 int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
456 int rc = 0, found = 0;
457 struct rio_dbell *dbell;
459 mutex_lock(&mport->lock);
460 list_for_each_entry(dbell, &mport->dbells, node) {
461 if ((dbell->res->start == start) && (dbell->res->end == end)) {
462 list_del(&dbell->node);
467 mutex_unlock(&mport->lock);
469 /* If we can't find an exact match, fail */
475 /* Release the doorbell resource */
476 rc = release_resource(dbell->res);
478 /* Free the doorbell event */
486 * rio_request_outb_dbell - request outbound doorbell message range
487 * @rdev: RIO device from which to allocate the doorbell resource
488 * @start: Doorbell message range start
489 * @end: Doorbell message range end
491 * Requests ownership of a doorbell message range. Returns a resource
492 * if the request has been satisfied or %NULL on failure.
494 struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start,
497 struct resource *res = kzalloc(sizeof(struct resource), GFP_KERNEL);
500 rio_init_dbell_res(res, start, end);
502 /* Make sure these doorbells aren't in use */
503 if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)
514 * rio_release_outb_dbell - release outbound doorbell message range
515 * @rdev: RIO device from which to release the doorbell resource
516 * @res: Doorbell resource to be freed
518 * Releases ownership of a doorbell message range. Returns 0 if the
519 * request has been satisfied.
521 int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res)
523 int rc = release_resource(res);
531 * rio_add_mport_pw_handler - add port-write message handler into the list
532 * of mport specific pw handlers
533 * @mport: RIO master port to bind the portwrite callback
534 * @context: Handler specific context to pass on event
535 * @pwcback: Callback to execute when portwrite is received
537 * Returns 0 if the request has been satisfied.
539 int rio_add_mport_pw_handler(struct rio_mport *mport, void *context,
540 int (*pwcback)(struct rio_mport *mport,
541 void *context, union rio_pw_msg *msg, int step))
544 struct rio_pwrite *pwrite;
546 pwrite = kzalloc(sizeof(struct rio_pwrite), GFP_KERNEL);
552 pwrite->pwcback = pwcback;
553 pwrite->context = context;
554 mutex_lock(&mport->lock);
555 list_add_tail(&pwrite->node, &mport->pwrites);
556 mutex_unlock(&mport->lock);
560 EXPORT_SYMBOL_GPL(rio_add_mport_pw_handler);
563 * rio_del_mport_pw_handler - remove port-write message handler from the list
564 * of mport specific pw handlers
565 * @mport: RIO master port to bind the portwrite callback
566 * @context: Registered handler specific context to pass on event
567 * @pwcback: Registered callback function
569 * Returns 0 if the request has been satisfied.
571 int rio_del_mport_pw_handler(struct rio_mport *mport, void *context,
572 int (*pwcback)(struct rio_mport *mport,
573 void *context, union rio_pw_msg *msg, int step))
576 struct rio_pwrite *pwrite;
578 mutex_lock(&mport->lock);
579 list_for_each_entry(pwrite, &mport->pwrites, node) {
580 if (pwrite->pwcback == pwcback && pwrite->context == context) {
581 list_del(&pwrite->node);
587 mutex_unlock(&mport->lock);
591 EXPORT_SYMBOL_GPL(rio_del_mport_pw_handler);
594 * rio_request_inb_pwrite - request inbound port-write message service for
595 * specific RapidIO device
596 * @rdev: RIO device to which register inbound port-write callback routine
597 * @pwcback: Callback routine to execute when port-write is received
599 * Binds a port-write callback function to the RapidIO device.
600 * Returns 0 if the request has been satisfied.
602 int rio_request_inb_pwrite(struct rio_dev *rdev,
603 int (*pwcback)(struct rio_dev *rdev, union rio_pw_msg *msg, int step))
607 spin_lock(&rio_global_list_lock);
608 if (rdev->pwcback != NULL)
611 rdev->pwcback = pwcback;
613 spin_unlock(&rio_global_list_lock);
616 EXPORT_SYMBOL_GPL(rio_request_inb_pwrite);
619 * rio_release_inb_pwrite - release inbound port-write message service
620 * associated with specific RapidIO device
621 * @rdev: RIO device which registered for inbound port-write callback
623 * Removes callback from the rio_dev structure. Returns 0 if the request
624 * has been satisfied.
626 int rio_release_inb_pwrite(struct rio_dev *rdev)
630 spin_lock(&rio_global_list_lock);
632 rdev->pwcback = NULL;
636 spin_unlock(&rio_global_list_lock);
639 EXPORT_SYMBOL_GPL(rio_release_inb_pwrite);
642 * rio_pw_enable - Enables/disables port-write handling by a master port
643 * @mport: Master port associated with port-write handling
644 * @enable: 1=enable, 0=disable
646 void rio_pw_enable(struct rio_mport *mport, int enable)
648 if (mport->ops->pwenable) {
649 mutex_lock(&mport->lock);
651 if ((enable && ++mport->pwe_refcnt == 1) ||
652 (!enable && mport->pwe_refcnt && --mport->pwe_refcnt == 0))
653 mport->ops->pwenable(mport, enable);
654 mutex_unlock(&mport->lock);
657 EXPORT_SYMBOL_GPL(rio_pw_enable);
660 * rio_map_inb_region -- Map inbound memory region.
661 * @mport: Master port.
662 * @local: physical address of memory region to be mapped
663 * @rbase: RIO base address assigned to this window
664 * @size: Size of the memory region
665 * @rflags: Flags for mapping.
667 * Return: 0 -- Success.
669 * This function will create the mapping from RIO space to local memory.
671 int rio_map_inb_region(struct rio_mport *mport, dma_addr_t local,
672 u64 rbase, u32 size, u32 rflags)
677 if (!mport->ops->map_inb)
679 spin_lock_irqsave(&rio_mmap_lock, flags);
680 rc = mport->ops->map_inb(mport, local, rbase, size, rflags);
681 spin_unlock_irqrestore(&rio_mmap_lock, flags);
684 EXPORT_SYMBOL_GPL(rio_map_inb_region);
687 * rio_unmap_inb_region -- Unmap the inbound memory region
688 * @mport: Master port
689 * @lstart: physical address of memory region to be unmapped
691 void rio_unmap_inb_region(struct rio_mport *mport, dma_addr_t lstart)
694 if (!mport->ops->unmap_inb)
696 spin_lock_irqsave(&rio_mmap_lock, flags);
697 mport->ops->unmap_inb(mport, lstart);
698 spin_unlock_irqrestore(&rio_mmap_lock, flags);
700 EXPORT_SYMBOL_GPL(rio_unmap_inb_region);
703 * rio_mport_get_physefb - Helper function that returns register offset
704 * for Physical Layer Extended Features Block.
705 * @port: Master port to issue transaction
706 * @local: Indicate a local master port or remote device access
707 * @destid: Destination ID of the device
708 * @hopcount: Number of switch hops to the device
711 rio_mport_get_physefb(struct rio_mport *port, int local,
712 u16 destid, u8 hopcount)
717 ext_ftr_ptr = rio_mport_get_efb(port, local, destid, hopcount, 0);
719 while (ext_ftr_ptr) {
721 rio_local_read_config_32(port, ext_ftr_ptr,
724 rio_mport_read_config_32(port, destid, hopcount,
725 ext_ftr_ptr, &ftr_header);
727 ftr_header = RIO_GET_BLOCK_ID(ftr_header);
728 switch (ftr_header) {
730 case RIO_EFB_SER_EP_ID_V13P:
731 case RIO_EFB_SER_EP_REC_ID_V13P:
732 case RIO_EFB_SER_EP_FREE_ID_V13P:
733 case RIO_EFB_SER_EP_ID:
734 case RIO_EFB_SER_EP_REC_ID:
735 case RIO_EFB_SER_EP_FREE_ID:
736 case RIO_EFB_SER_EP_FREC_ID:
744 ext_ftr_ptr = rio_mport_get_efb(port, local, destid,
745 hopcount, ext_ftr_ptr);
750 EXPORT_SYMBOL_GPL(rio_mport_get_physefb);
753 * rio_get_comptag - Begin or continue searching for a RIO device by component tag
754 * @comp_tag: RIO component tag to match
755 * @from: Previous RIO device found in search, or %NULL for new search
757 * Iterates through the list of known RIO devices. If a RIO device is
758 * found with a matching @comp_tag, a pointer to its device
759 * structure is returned. Otherwise, %NULL is returned. A new search
760 * is initiated by passing %NULL to the @from argument. Otherwise, if
761 * @from is not %NULL, searches continue from next device on the global
764 struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from)
767 struct rio_dev *rdev;
769 spin_lock(&rio_global_list_lock);
770 n = from ? from->global_list.next : rio_devices.next;
772 while (n && (n != &rio_devices)) {
774 if (rdev->comp_tag == comp_tag)
780 spin_unlock(&rio_global_list_lock);
783 EXPORT_SYMBOL_GPL(rio_get_comptag);
786 * rio_set_port_lockout - Sets/clears LOCKOUT bit (RIO EM 1.3) for a switch port.
787 * @rdev: Pointer to RIO device control structure
788 * @pnum: Switch port number to set LOCKOUT bit
789 * @lock: Operation : set (=1) or clear (=0)
791 int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock)
795 rio_read_config_32(rdev,
796 rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
799 regval |= RIO_PORT_N_CTL_LOCKOUT;
801 regval &= ~RIO_PORT_N_CTL_LOCKOUT;
803 rio_write_config_32(rdev,
804 rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
808 EXPORT_SYMBOL_GPL(rio_set_port_lockout);
811 * rio_enable_rx_tx_port - enable input receiver and output transmitter of
813 * @port: Master port associated with the RIO network
814 * @local: local=1 select local port otherwise a far device is reached
815 * @destid: Destination ID of the device to check host bit
816 * @hopcount: Number of hops to reach the target
817 * @port_num: Port (-number on switch) to enable on a far end device
819 * Returns 0 or 1 from on General Control Command and Status Register
822 int rio_enable_rx_tx_port(struct rio_mport *port,
823 int local, u16 destid,
824 u8 hopcount, u8 port_num)
826 #ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
831 * enable rx input tx output port
833 pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
834 "%d, port_num = %d)\n", local, destid, hopcount, port_num);
836 ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
839 rio_local_read_config_32(port, ext_ftr_ptr +
840 RIO_PORT_N_CTL_CSR(0),
843 if (rio_mport_read_config_32(port, destid, hopcount,
844 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), ®val) < 0)
848 if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
850 regval = regval | RIO_PORT_N_CTL_EN_RX_SER
851 | RIO_PORT_N_CTL_EN_TX_SER;
854 regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
855 | RIO_PORT_N_CTL_EN_TX_PAR;
859 rio_local_write_config_32(port, ext_ftr_ptr +
860 RIO_PORT_N_CTL_CSR(0), regval);
862 if (rio_mport_write_config_32(port, destid, hopcount,
863 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
869 EXPORT_SYMBOL_GPL(rio_enable_rx_tx_port);
873 * rio_chk_dev_route - Validate route to the specified device.
874 * @rdev: RIO device failed to respond
875 * @nrdev: Last active device on the route to rdev
876 * @npnum: nrdev's port number on the route to rdev
878 * Follows a route to the specified RIO device to determine the last available
879 * device (and corresponding RIO port) on the route.
882 rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum)
885 int p_port, rc = -EIO;
886 struct rio_dev *prev = NULL;
888 /* Find switch with failed RIO link */
889 while (rdev->prev && (rdev->prev->pef & RIO_PEF_SWITCH)) {
890 if (!rio_read_config_32(rdev->prev, RIO_DEV_ID_CAR, &result)) {
900 p_port = prev->rswitch->route_table[rdev->destid];
902 if (p_port != RIO_INVALID_ROUTE) {
903 pr_debug("RIO: link failed on [%s]-P%d\n",
904 rio_name(prev), p_port);
909 pr_debug("RIO: failed to trace route to %s\n", rio_name(rdev));
915 * rio_mport_chk_dev_access - Validate access to the specified device.
916 * @mport: Master port to send transactions
917 * @destid: Device destination ID in network
918 * @hopcount: Number of hops into the network
921 rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount)
926 while (rio_mport_read_config_32(mport, destid, hopcount,
927 RIO_DEV_ID_CAR, &tmp)) {
929 if (i == RIO_MAX_CHK_RETRY)
936 EXPORT_SYMBOL_GPL(rio_mport_chk_dev_access);
939 * rio_chk_dev_access - Validate access to the specified device.
940 * @rdev: Pointer to RIO device control structure
942 static int rio_chk_dev_access(struct rio_dev *rdev)
944 return rio_mport_chk_dev_access(rdev->net->hport,
945 rdev->destid, rdev->hopcount);
949 * rio_get_input_status - Sends a Link-Request/Input-Status control symbol and
950 * returns link-response (if requested).
951 * @rdev: RIO devive to issue Input-status command
952 * @pnum: Device port number to issue the command
953 * @lnkresp: Response from a link partner
956 rio_get_input_status(struct rio_dev *rdev, int pnum, u32 *lnkresp)
962 /* Read from link maintenance response register
963 * to clear valid bit */
964 rio_read_config_32(rdev,
965 rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
970 /* Issue Input-status command */
971 rio_write_config_32(rdev,
972 rdev->phys_efptr + RIO_PORT_N_MNT_REQ_CSR(pnum),
975 /* Exit if the response is not expected */
980 while (checkcount--) {
982 rio_read_config_32(rdev,
983 rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
985 if (regval & RIO_PORT_N_MNT_RSP_RVAL) {
995 * rio_clr_err_stopped - Clears port Error-stopped states.
996 * @rdev: Pointer to RIO device control structure
997 * @pnum: Switch port number to clear errors
998 * @err_status: port error status (if 0 reads register from device)
1000 static int rio_clr_err_stopped(struct rio_dev *rdev, u32 pnum, u32 err_status)
1002 struct rio_dev *nextdev = rdev->rswitch->nextdev[pnum];
1004 u32 far_ackid, far_linkstat, near_ackid;
1006 if (err_status == 0)
1007 rio_read_config_32(rdev,
1008 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
1011 if (err_status & RIO_PORT_N_ERR_STS_PW_OUT_ES) {
1012 pr_debug("RIO_EM: servicing Output Error-Stopped state\n");
1014 * Send a Link-Request/Input-Status control symbol
1016 if (rio_get_input_status(rdev, pnum, ®val)) {
1017 pr_debug("RIO_EM: Input-status response timeout\n");
1021 pr_debug("RIO_EM: SP%d Input-status response=0x%08x\n",
1023 far_ackid = (regval & RIO_PORT_N_MNT_RSP_ASTAT) >> 5;
1024 far_linkstat = regval & RIO_PORT_N_MNT_RSP_LSTAT;
1025 rio_read_config_32(rdev,
1026 rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
1028 pr_debug("RIO_EM: SP%d_ACK_STS_CSR=0x%08x\n", pnum, regval);
1029 near_ackid = (regval & RIO_PORT_N_ACK_INBOUND) >> 24;
1030 pr_debug("RIO_EM: SP%d far_ackID=0x%02x far_linkstat=0x%02x" \
1031 " near_ackID=0x%02x\n",
1032 pnum, far_ackid, far_linkstat, near_ackid);
1035 * If required, synchronize ackIDs of near and
1038 if ((far_ackid != ((regval & RIO_PORT_N_ACK_OUTSTAND) >> 8)) ||
1039 (far_ackid != (regval & RIO_PORT_N_ACK_OUTBOUND))) {
1040 /* Align near outstanding/outbound ackIDs with
1043 rio_write_config_32(rdev,
1044 rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
1045 (near_ackid << 24) |
1046 (far_ackid << 8) | far_ackid);
1047 /* Align far outstanding/outbound ackIDs with
1052 rio_write_config_32(nextdev,
1053 nextdev->phys_efptr +
1054 RIO_PORT_N_ACK_STS_CSR(RIO_GET_PORT_NUM(nextdev->swpinfo)),
1056 (near_ackid << 8) | near_ackid);
1058 pr_debug("RIO_EM: Invalid nextdev pointer (NULL)\n");
1061 rio_read_config_32(rdev,
1062 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
1064 pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
1067 if ((err_status & RIO_PORT_N_ERR_STS_PW_INP_ES) && nextdev) {
1068 pr_debug("RIO_EM: servicing Input Error-Stopped state\n");
1069 rio_get_input_status(nextdev,
1070 RIO_GET_PORT_NUM(nextdev->swpinfo), NULL);
1073 rio_read_config_32(rdev,
1074 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
1076 pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
1079 return (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
1080 RIO_PORT_N_ERR_STS_PW_INP_ES)) ? 1 : 0;
1084 * rio_inb_pwrite_handler - inbound port-write message handler
1085 * @mport: mport device associated with port-write
1086 * @pw_msg: pointer to inbound port-write message
1088 * Processes an inbound port-write message. Returns 0 if the request
1089 * has been satisfied.
1091 int rio_inb_pwrite_handler(struct rio_mport *mport, union rio_pw_msg *pw_msg)
1093 struct rio_dev *rdev;
1094 u32 err_status, em_perrdet, em_ltlerrdet;
1096 struct rio_pwrite *pwrite;
1102 pr_debug("%s: PW to mport_%d:\n", __func__, mport->id);
1103 for (i = 0; i < RIO_PW_MSG_SIZE / sizeof(u32); i = i + 4) {
1104 pr_debug("0x%02x: %08x %08x %08x %08x\n",
1105 i * 4, pw_msg->raw[i], pw_msg->raw[i + 1],
1106 pw_msg->raw[i + 2], pw_msg->raw[i + 3]);
1111 rdev = rio_get_comptag((pw_msg->em.comptag & RIO_CTAG_UDEVID), NULL);
1113 pr_debug("RIO: Port-Write message from %s\n", rio_name(rdev));
1115 pr_debug("RIO: %s No matching device for CTag 0x%08x\n",
1116 __func__, pw_msg->em.comptag);
1119 /* Call a device-specific handler (if it is registered for the device).
1120 * This may be the service for endpoints that send device-specific
1121 * port-write messages. End-point messages expected to be handled
1122 * completely by EP specific device driver.
1123 * For switches rc==0 signals that no standard processing required.
1125 if (rdev && rdev->pwcback) {
1126 rc = rdev->pwcback(rdev, pw_msg, 0);
1131 mutex_lock(&mport->lock);
1132 list_for_each_entry(pwrite, &mport->pwrites, node)
1133 pwrite->pwcback(mport, pwrite->context, pw_msg, 0);
1134 mutex_unlock(&mport->lock);
1140 * FIXME: The code below stays as it was before for now until we decide
1141 * how to do default PW handling in combination with per-mport callbacks
1144 portnum = pw_msg->em.is_port & 0xFF;
1146 /* Check if device and route to it are functional:
1147 * Sometimes devices may send PW message(s) just before being
1148 * powered down (or link being lost).
1150 if (rio_chk_dev_access(rdev)) {
1151 pr_debug("RIO: device access failed - get link partner\n");
1152 /* Scan route to the device and identify failed link.
1153 * This will replace device and port reported in PW message.
1154 * PW message should not be used after this point.
1156 if (rio_chk_dev_route(rdev, &rdev, &portnum)) {
1157 pr_err("RIO: Route trace for %s failed\n",
1164 /* For End-point devices processing stops here */
1165 if (!(rdev->pef & RIO_PEF_SWITCH))
1168 if (rdev->phys_efptr == 0) {
1169 pr_err("RIO_PW: Bad switch initialization for %s\n",
1175 * Process the port-write notification from switch
1177 if (rdev->rswitch->ops && rdev->rswitch->ops->em_handle)
1178 rdev->rswitch->ops->em_handle(rdev, portnum);
1180 rio_read_config_32(rdev,
1181 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
1183 pr_debug("RIO_PW: SP%d_ERR_STS_CSR=0x%08x\n", portnum, err_status);
1185 if (err_status & RIO_PORT_N_ERR_STS_PORT_OK) {
1187 if (!(rdev->rswitch->port_ok & (1 << portnum))) {
1188 rdev->rswitch->port_ok |= (1 << portnum);
1189 rio_set_port_lockout(rdev, portnum, 0);
1190 /* Schedule Insertion Service */
1191 pr_debug("RIO_PW: Device Insertion on [%s]-P%d\n",
1192 rio_name(rdev), portnum);
1195 /* Clear error-stopped states (if reported).
1196 * Depending on the link partner state, two attempts
1197 * may be needed for successful recovery.
1199 if (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
1200 RIO_PORT_N_ERR_STS_PW_INP_ES)) {
1201 if (rio_clr_err_stopped(rdev, portnum, err_status))
1202 rio_clr_err_stopped(rdev, portnum, 0);
1204 } else { /* if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT) */
1206 if (rdev->rswitch->port_ok & (1 << portnum)) {
1207 rdev->rswitch->port_ok &= ~(1 << portnum);
1208 rio_set_port_lockout(rdev, portnum, 1);
1210 rio_write_config_32(rdev,
1212 RIO_PORT_N_ACK_STS_CSR(portnum),
1213 RIO_PORT_N_ACK_CLEAR);
1215 /* Schedule Extraction Service */
1216 pr_debug("RIO_PW: Device Extraction on [%s]-P%d\n",
1217 rio_name(rdev), portnum);
1221 rio_read_config_32(rdev,
1222 rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), &em_perrdet);
1224 pr_debug("RIO_PW: RIO_EM_P%d_ERR_DETECT=0x%08x\n",
1225 portnum, em_perrdet);
1226 /* Clear EM Port N Error Detect CSR */
1227 rio_write_config_32(rdev,
1228 rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), 0);
1231 rio_read_config_32(rdev,
1232 rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, &em_ltlerrdet);
1234 pr_debug("RIO_PW: RIO_EM_LTL_ERR_DETECT=0x%08x\n",
1236 /* Clear EM L/T Layer Error Detect CSR */
1237 rio_write_config_32(rdev,
1238 rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, 0);
1241 /* Clear remaining error bits and Port-Write Pending bit */
1242 rio_write_config_32(rdev,
1243 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
1248 EXPORT_SYMBOL_GPL(rio_inb_pwrite_handler);
1251 * rio_mport_get_efb - get pointer to next extended features block
1252 * @port: Master port to issue transaction
1253 * @local: Indicate a local master port or remote device access
1254 * @destid: Destination ID of the device
1255 * @hopcount: Number of switch hops to the device
1256 * @from: Offset of current Extended Feature block header (if 0 starts
1257 * from ExtFeaturePtr)
1260 rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,
1261 u8 hopcount, u32 from)
1267 rio_local_read_config_32(port, RIO_ASM_INFO_CAR,
1270 rio_mport_read_config_32(port, destid, hopcount,
1271 RIO_ASM_INFO_CAR, ®_val);
1272 return reg_val & RIO_EXT_FTR_PTR_MASK;
1275 rio_local_read_config_32(port, from, ®_val);
1277 rio_mport_read_config_32(port, destid, hopcount,
1279 return RIO_GET_BLOCK_ID(reg_val);
1282 EXPORT_SYMBOL_GPL(rio_mport_get_efb);
1285 * rio_mport_get_feature - query for devices' extended features
1286 * @port: Master port to issue transaction
1287 * @local: Indicate a local master port or remote device access
1288 * @destid: Destination ID of the device
1289 * @hopcount: Number of switch hops to the device
1290 * @ftr: Extended feature code
1292 * Tell if a device supports a given RapidIO capability.
1293 * Returns the offset of the requested extended feature
1294 * block within the device's RIO configuration space or
1295 * 0 in case the device does not support it. Possible
1298 * %RIO_EFB_PAR_EP_ID LP/LVDS EP Devices
1300 * %RIO_EFB_PAR_EP_REC_ID LP/LVDS EP Recovery Devices
1302 * %RIO_EFB_PAR_EP_FREE_ID LP/LVDS EP Free Devices
1304 * %RIO_EFB_SER_EP_ID LP/Serial EP Devices
1306 * %RIO_EFB_SER_EP_REC_ID LP/Serial EP Recovery Devices
1308 * %RIO_EFB_SER_EP_FREE_ID LP/Serial EP Free Devices
1311 rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
1312 u8 hopcount, int ftr)
1314 u32 asm_info, ext_ftr_ptr, ftr_header;
1317 rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);
1319 rio_mport_read_config_32(port, destid, hopcount,
1320 RIO_ASM_INFO_CAR, &asm_info);
1322 ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;
1324 while (ext_ftr_ptr) {
1326 rio_local_read_config_32(port, ext_ftr_ptr,
1329 rio_mport_read_config_32(port, destid, hopcount,
1330 ext_ftr_ptr, &ftr_header);
1331 if (RIO_GET_BLOCK_ID(ftr_header) == ftr)
1333 if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header)))
1339 EXPORT_SYMBOL_GPL(rio_mport_get_feature);
1342 * rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
1343 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
1344 * @did: RIO did to match or %RIO_ANY_ID to match all dids
1345 * @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids
1346 * @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids
1347 * @from: Previous RIO device found in search, or %NULL for new search
1349 * Iterates through the list of known RIO devices. If a RIO device is
1350 * found with a matching @vid, @did, @asm_vid, @asm_did, the reference
1351 * count to the device is incrememted and a pointer to its device
1352 * structure is returned. Otherwise, %NULL is returned. A new search
1353 * is initiated by passing %NULL to the @from argument. Otherwise, if
1354 * @from is not %NULL, searches continue from next device on the global
1355 * list. The reference count for @from is always decremented if it is
1358 struct rio_dev *rio_get_asm(u16 vid, u16 did,
1359 u16 asm_vid, u16 asm_did, struct rio_dev *from)
1361 struct list_head *n;
1362 struct rio_dev *rdev;
1364 WARN_ON(in_interrupt());
1365 spin_lock(&rio_global_list_lock);
1366 n = from ? from->global_list.next : rio_devices.next;
1368 while (n && (n != &rio_devices)) {
1369 rdev = rio_dev_g(n);
1370 if ((vid == RIO_ANY_ID || rdev->vid == vid) &&
1371 (did == RIO_ANY_ID || rdev->did == did) &&
1372 (asm_vid == RIO_ANY_ID || rdev->asm_vid == asm_vid) &&
1373 (asm_did == RIO_ANY_ID || rdev->asm_did == asm_did))
1380 rdev = rio_dev_get(rdev);
1381 spin_unlock(&rio_global_list_lock);
1386 * rio_get_device - Begin or continue searching for a RIO device by vid/did
1387 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
1388 * @did: RIO did to match or %RIO_ANY_ID to match all dids
1389 * @from: Previous RIO device found in search, or %NULL for new search
1391 * Iterates through the list of known RIO devices. If a RIO device is
1392 * found with a matching @vid and @did, the reference count to the
1393 * device is incrememted and a pointer to its device structure is returned.
1394 * Otherwise, %NULL is returned. A new search is initiated by passing %NULL
1395 * to the @from argument. Otherwise, if @from is not %NULL, searches
1396 * continue from next device on the global list. The reference count for
1397 * @from is always decremented if it is not %NULL.
1399 struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from)
1401 return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
1405 * rio_std_route_add_entry - Add switch route table entry using standard
1406 * registers defined in RIO specification rev.1.3
1407 * @mport: Master port to issue transaction
1408 * @destid: Destination ID of the device
1409 * @hopcount: Number of switch hops to the device
1410 * @table: routing table ID (global or port-specific)
1411 * @route_destid: destID entry in the RT
1412 * @route_port: destination port for specified destID
1415 rio_std_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1416 u16 table, u16 route_destid, u8 route_port)
1418 if (table == RIO_GLOBAL_TABLE) {
1419 rio_mport_write_config_32(mport, destid, hopcount,
1420 RIO_STD_RTE_CONF_DESTID_SEL_CSR,
1422 rio_mport_write_config_32(mport, destid, hopcount,
1423 RIO_STD_RTE_CONF_PORT_SEL_CSR,
1432 * rio_std_route_get_entry - Read switch route table entry (port number)
1433 * associated with specified destID using standard registers defined in RIO
1434 * specification rev.1.3
1435 * @mport: Master port to issue transaction
1436 * @destid: Destination ID of the device
1437 * @hopcount: Number of switch hops to the device
1438 * @table: routing table ID (global or port-specific)
1439 * @route_destid: destID entry in the RT
1440 * @route_port: returned destination port for specified destID
1443 rio_std_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1444 u16 table, u16 route_destid, u8 *route_port)
1448 if (table == RIO_GLOBAL_TABLE) {
1449 rio_mport_write_config_32(mport, destid, hopcount,
1450 RIO_STD_RTE_CONF_DESTID_SEL_CSR, route_destid);
1451 rio_mport_read_config_32(mport, destid, hopcount,
1452 RIO_STD_RTE_CONF_PORT_SEL_CSR, &result);
1454 *route_port = (u8)result;
1461 * rio_std_route_clr_table - Clear swotch route table using standard registers
1462 * defined in RIO specification rev.1.3.
1463 * @mport: Master port to issue transaction
1464 * @destid: Destination ID of the device
1465 * @hopcount: Number of switch hops to the device
1466 * @table: routing table ID (global or port-specific)
1469 rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
1472 u32 max_destid = 0xff;
1473 u32 i, pef, id_inc = 1, ext_cfg = 0;
1474 u32 port_sel = RIO_INVALID_ROUTE;
1476 if (table == RIO_GLOBAL_TABLE) {
1477 rio_mport_read_config_32(mport, destid, hopcount,
1480 if (mport->sys_size) {
1481 rio_mport_read_config_32(mport, destid, hopcount,
1482 RIO_SWITCH_RT_LIMIT,
1484 max_destid &= RIO_RT_MAX_DESTID;
1487 if (pef & RIO_PEF_EXT_RT) {
1488 ext_cfg = 0x80000000;
1490 port_sel = (RIO_INVALID_ROUTE << 24) |
1491 (RIO_INVALID_ROUTE << 16) |
1492 (RIO_INVALID_ROUTE << 8) |
1496 for (i = 0; i <= max_destid;) {
1497 rio_mport_write_config_32(mport, destid, hopcount,
1498 RIO_STD_RTE_CONF_DESTID_SEL_CSR,
1500 rio_mport_write_config_32(mport, destid, hopcount,
1501 RIO_STD_RTE_CONF_PORT_SEL_CSR,
1512 * rio_lock_device - Acquires host device lock for specified device
1513 * @port: Master port to send transaction
1514 * @destid: Destination ID for device/switch
1515 * @hopcount: Hopcount to reach switch
1516 * @wait_ms: Max wait time in msec (0 = no timeout)
1518 * Attepts to acquire host device lock for specified device
1519 * Returns 0 if device lock acquired or EINVAL if timeout expires.
1521 int rio_lock_device(struct rio_mport *port, u16 destid,
1522 u8 hopcount, int wait_ms)
1527 /* Attempt to acquire device lock */
1528 rio_mport_write_config_32(port, destid, hopcount,
1529 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
1530 rio_mport_read_config_32(port, destid, hopcount,
1531 RIO_HOST_DID_LOCK_CSR, &result);
1533 while (result != port->host_deviceid) {
1534 if (wait_ms != 0 && tcnt == wait_ms) {
1535 pr_debug("RIO: timeout when locking device %x:%x\n",
1543 /* Try to acquire device lock again */
1544 rio_mport_write_config_32(port, destid,
1546 RIO_HOST_DID_LOCK_CSR,
1547 port->host_deviceid);
1548 rio_mport_read_config_32(port, destid,
1550 RIO_HOST_DID_LOCK_CSR, &result);
1555 EXPORT_SYMBOL_GPL(rio_lock_device);
1558 * rio_unlock_device - Releases host device lock for specified device
1559 * @port: Master port to send transaction
1560 * @destid: Destination ID for device/switch
1561 * @hopcount: Hopcount to reach switch
1563 * Returns 0 if device lock released or EINVAL if fails.
1565 int rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
1569 /* Release device lock */
1570 rio_mport_write_config_32(port, destid,
1572 RIO_HOST_DID_LOCK_CSR,
1573 port->host_deviceid);
1574 rio_mport_read_config_32(port, destid, hopcount,
1575 RIO_HOST_DID_LOCK_CSR, &result);
1576 if ((result & 0xffff) != 0xffff) {
1577 pr_debug("RIO: badness when releasing device lock %x:%x\n",
1584 EXPORT_SYMBOL_GPL(rio_unlock_device);
1587 * rio_route_add_entry- Add a route entry to a switch routing table
1589 * @table: Routing table ID
1590 * @route_destid: Destination ID to be routed
1591 * @route_port: Port number to be routed
1592 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
1594 * If available calls the switch specific add_entry() method to add a route
1595 * entry into a switch routing table. Otherwise uses standard RT update method
1596 * as defined by RapidIO specification. A specific routing table can be selected
1597 * using the @table argument if a switch has per port routing tables or
1598 * the standard (or global) table may be used by passing
1599 * %RIO_GLOBAL_TABLE in @table.
1601 * Returns %0 on success or %-EINVAL on failure.
1603 int rio_route_add_entry(struct rio_dev *rdev,
1604 u16 table, u16 route_destid, u8 route_port, int lock)
1607 struct rio_switch_ops *ops = rdev->rswitch->ops;
1610 rc = rio_lock_device(rdev->net->hport, rdev->destid,
1611 rdev->hopcount, 1000);
1616 spin_lock(&rdev->rswitch->lock);
1618 if (ops == NULL || ops->add_entry == NULL) {
1619 rc = rio_std_route_add_entry(rdev->net->hport, rdev->destid,
1620 rdev->hopcount, table,
1621 route_destid, route_port);
1622 } else if (try_module_get(ops->owner)) {
1623 rc = ops->add_entry(rdev->net->hport, rdev->destid,
1624 rdev->hopcount, table, route_destid,
1626 module_put(ops->owner);
1629 spin_unlock(&rdev->rswitch->lock);
1632 rio_unlock_device(rdev->net->hport, rdev->destid,
1637 EXPORT_SYMBOL_GPL(rio_route_add_entry);
1640 * rio_route_get_entry- Read an entry from a switch routing table
1642 * @table: Routing table ID
1643 * @route_destid: Destination ID to be routed
1644 * @route_port: Pointer to read port number into
1645 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
1647 * If available calls the switch specific get_entry() method to fetch a route
1648 * entry from a switch routing table. Otherwise uses standard RT read method
1649 * as defined by RapidIO specification. A specific routing table can be selected
1650 * using the @table argument if a switch has per port routing tables or
1651 * the standard (or global) table may be used by passing
1652 * %RIO_GLOBAL_TABLE in @table.
1654 * Returns %0 on success or %-EINVAL on failure.
1656 int rio_route_get_entry(struct rio_dev *rdev, u16 table,
1657 u16 route_destid, u8 *route_port, int lock)
1660 struct rio_switch_ops *ops = rdev->rswitch->ops;
1663 rc = rio_lock_device(rdev->net->hport, rdev->destid,
1664 rdev->hopcount, 1000);
1669 spin_lock(&rdev->rswitch->lock);
1671 if (ops == NULL || ops->get_entry == NULL) {
1672 rc = rio_std_route_get_entry(rdev->net->hport, rdev->destid,
1673 rdev->hopcount, table,
1674 route_destid, route_port);
1675 } else if (try_module_get(ops->owner)) {
1676 rc = ops->get_entry(rdev->net->hport, rdev->destid,
1677 rdev->hopcount, table, route_destid,
1679 module_put(ops->owner);
1682 spin_unlock(&rdev->rswitch->lock);
1685 rio_unlock_device(rdev->net->hport, rdev->destid,
1689 EXPORT_SYMBOL_GPL(rio_route_get_entry);
1692 * rio_route_clr_table - Clear a switch routing table
1694 * @table: Routing table ID
1695 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
1697 * If available calls the switch specific clr_table() method to clear a switch
1698 * routing table. Otherwise uses standard RT write method as defined by RapidIO
1699 * specification. A specific routing table can be selected using the @table
1700 * argument if a switch has per port routing tables or the standard (or global)
1701 * table may be used by passing %RIO_GLOBAL_TABLE in @table.
1703 * Returns %0 on success or %-EINVAL on failure.
1705 int rio_route_clr_table(struct rio_dev *rdev, u16 table, int lock)
1708 struct rio_switch_ops *ops = rdev->rswitch->ops;
1711 rc = rio_lock_device(rdev->net->hport, rdev->destid,
1712 rdev->hopcount, 1000);
1717 spin_lock(&rdev->rswitch->lock);
1719 if (ops == NULL || ops->clr_table == NULL) {
1720 rc = rio_std_route_clr_table(rdev->net->hport, rdev->destid,
1721 rdev->hopcount, table);
1722 } else if (try_module_get(ops->owner)) {
1723 rc = ops->clr_table(rdev->net->hport, rdev->destid,
1724 rdev->hopcount, table);
1726 module_put(ops->owner);
1729 spin_unlock(&rdev->rswitch->lock);
1732 rio_unlock_device(rdev->net->hport, rdev->destid,
1737 EXPORT_SYMBOL_GPL(rio_route_clr_table);
1739 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1741 static bool rio_chan_filter(struct dma_chan *chan, void *arg)
1743 struct rio_mport *mport = arg;
1745 /* Check that DMA device belongs to the right MPORT */
1746 return mport == container_of(chan->device, struct rio_mport, dma);
1750 * rio_request_mport_dma - request RapidIO capable DMA channel associated
1751 * with specified local RapidIO mport device.
1752 * @mport: RIO mport to perform DMA data transfers
1754 * Returns pointer to allocated DMA channel or NULL if failed.
1756 struct dma_chan *rio_request_mport_dma(struct rio_mport *mport)
1758 dma_cap_mask_t mask;
1761 dma_cap_set(DMA_SLAVE, mask);
1762 return dma_request_channel(mask, rio_chan_filter, mport);
1764 EXPORT_SYMBOL_GPL(rio_request_mport_dma);
1767 * rio_request_dma - request RapidIO capable DMA channel that supports
1768 * specified target RapidIO device.
1769 * @rdev: RIO device associated with DMA transfer
1771 * Returns pointer to allocated DMA channel or NULL if failed.
1773 struct dma_chan *rio_request_dma(struct rio_dev *rdev)
1775 return rio_request_mport_dma(rdev->net->hport);
1777 EXPORT_SYMBOL_GPL(rio_request_dma);
1780 * rio_release_dma - release specified DMA channel
1781 * @dchan: DMA channel to release
1783 void rio_release_dma(struct dma_chan *dchan)
1785 dma_release_channel(dchan);
1787 EXPORT_SYMBOL_GPL(rio_release_dma);
1790 * rio_dma_prep_xfer - RapidIO specific wrapper
1791 * for device_prep_slave_sg callback defined by DMAENGINE.
1792 * @dchan: DMA channel to configure
1793 * @destid: target RapidIO device destination ID
1794 * @data: RIO specific data descriptor
1795 * @direction: DMA data transfer direction (TO or FROM the device)
1796 * @flags: dmaengine defined flags
1798 * Initializes RapidIO capable DMA channel for the specified data transfer.
1799 * Uses DMA channel private extension to pass information related to remote
1800 * target RIO device.
1801 * Returns pointer to DMA transaction descriptor or NULL if failed.
1803 struct dma_async_tx_descriptor *rio_dma_prep_xfer(struct dma_chan *dchan,
1804 u16 destid, struct rio_dma_data *data,
1805 enum dma_transfer_direction direction, unsigned long flags)
1807 struct rio_dma_ext rio_ext;
1809 if (dchan->device->device_prep_slave_sg == NULL) {
1810 pr_err("%s: prep_rio_sg == NULL\n", __func__);
1814 rio_ext.destid = destid;
1815 rio_ext.rio_addr_u = data->rio_addr_u;
1816 rio_ext.rio_addr = data->rio_addr;
1817 rio_ext.wr_type = data->wr_type;
1819 return dmaengine_prep_rio_sg(dchan, data->sg, data->sg_len,
1820 direction, flags, &rio_ext);
1822 EXPORT_SYMBOL_GPL(rio_dma_prep_xfer);
1825 * rio_dma_prep_slave_sg - RapidIO specific wrapper
1826 * for device_prep_slave_sg callback defined by DMAENGINE.
1827 * @rdev: RIO device control structure
1828 * @dchan: DMA channel to configure
1829 * @data: RIO specific data descriptor
1830 * @direction: DMA data transfer direction (TO or FROM the device)
1831 * @flags: dmaengine defined flags
1833 * Initializes RapidIO capable DMA channel for the specified data transfer.
1834 * Uses DMA channel private extension to pass information related to remote
1835 * target RIO device.
1836 * Returns pointer to DMA transaction descriptor or NULL if failed.
1838 struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(struct rio_dev *rdev,
1839 struct dma_chan *dchan, struct rio_dma_data *data,
1840 enum dma_transfer_direction direction, unsigned long flags)
1842 return rio_dma_prep_xfer(dchan, rdev->destid, data, direction, flags);
1844 EXPORT_SYMBOL_GPL(rio_dma_prep_slave_sg);
1846 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1849 * rio_find_mport - find RIO mport by its ID
1850 * @mport_id: number (ID) of mport device
1852 * Given a RIO mport number, the desired mport is located
1853 * in the global list of mports. If the mport is found, a pointer to its
1854 * data structure is returned. If no mport is found, %NULL is returned.
1856 struct rio_mport *rio_find_mport(int mport_id)
1858 struct rio_mport *port;
1860 mutex_lock(&rio_mport_list_lock);
1861 list_for_each_entry(port, &rio_mports, node) {
1862 if (port->id == mport_id)
1867 mutex_unlock(&rio_mport_list_lock);
1873 * rio_register_scan - enumeration/discovery method registration interface
1874 * @mport_id: mport device ID for which fabric scan routine has to be set
1875 * (RIO_MPORT_ANY = set for all available mports)
1876 * @scan_ops: enumeration/discovery operations structure
1878 * Registers enumeration/discovery operations with RapidIO subsystem and
1879 * attaches it to the specified mport device (or all available mports
1880 * if RIO_MPORT_ANY is specified).
1882 * Returns error if the mport already has an enumerator attached to it.
1883 * In case of RIO_MPORT_ANY skips mports with valid scan routines (no error).
1885 int rio_register_scan(int mport_id, struct rio_scan *scan_ops)
1887 struct rio_mport *port;
1888 struct rio_scan_node *scan;
1891 pr_debug("RIO: %s for mport_id=%d\n", __func__, mport_id);
1893 if ((mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS) ||
1897 mutex_lock(&rio_mport_list_lock);
1900 * Check if there is another enumerator already registered for
1901 * the same mport ID (including RIO_MPORT_ANY). Multiple enumerators
1902 * for the same mport ID are not supported.
1904 list_for_each_entry(scan, &rio_scans, node) {
1905 if (scan->mport_id == mport_id) {
1912 * Allocate and initialize new scan registration node.
1914 scan = kzalloc(sizeof(*scan), GFP_KERNEL);
1920 scan->mport_id = mport_id;
1921 scan->ops = scan_ops;
1924 * Traverse the list of registered mports to attach this new scan.
1926 * The new scan with matching mport ID overrides any previously attached
1927 * scan assuming that old scan (if any) is the default one (based on the
1928 * enumerator registration check above).
1929 * If the new scan is the global one, it will be attached only to mports
1930 * that do not have their own individual operations already attached.
1932 list_for_each_entry(port, &rio_mports, node) {
1933 if (port->id == mport_id) {
1934 port->nscan = scan_ops;
1936 } else if (mport_id == RIO_MPORT_ANY && !port->nscan)
1937 port->nscan = scan_ops;
1940 list_add_tail(&scan->node, &rio_scans);
1943 mutex_unlock(&rio_mport_list_lock);
1947 EXPORT_SYMBOL_GPL(rio_register_scan);
1950 * rio_unregister_scan - removes enumeration/discovery method from mport
1951 * @mport_id: mport device ID for which fabric scan routine has to be
1952 * unregistered (RIO_MPORT_ANY = apply to all mports that use
1953 * the specified scan_ops)
1954 * @scan_ops: enumeration/discovery operations structure
1956 * Removes enumeration or discovery method assigned to the specified mport
1957 * device. If RIO_MPORT_ANY is specified, removes the specified operations from
1958 * all mports that have them attached.
1960 int rio_unregister_scan(int mport_id, struct rio_scan *scan_ops)
1962 struct rio_mport *port;
1963 struct rio_scan_node *scan;
1965 pr_debug("RIO: %s for mport_id=%d\n", __func__, mport_id);
1967 if (mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS)
1970 mutex_lock(&rio_mport_list_lock);
1972 list_for_each_entry(port, &rio_mports, node)
1973 if (port->id == mport_id ||
1974 (mport_id == RIO_MPORT_ANY && port->nscan == scan_ops))
1977 list_for_each_entry(scan, &rio_scans, node) {
1978 if (scan->mport_id == mport_id) {
1979 list_del(&scan->node);
1985 mutex_unlock(&rio_mport_list_lock);
1989 EXPORT_SYMBOL_GPL(rio_unregister_scan);
1992 * rio_mport_scan - execute enumeration/discovery on the specified mport
1993 * @mport_id: number (ID) of mport device
1995 int rio_mport_scan(int mport_id)
1997 struct rio_mport *port = NULL;
2000 mutex_lock(&rio_mport_list_lock);
2001 list_for_each_entry(port, &rio_mports, node) {
2002 if (port->id == mport_id)
2005 mutex_unlock(&rio_mport_list_lock);
2009 mutex_unlock(&rio_mport_list_lock);
2013 if (!try_module_get(port->nscan->owner)) {
2014 mutex_unlock(&rio_mport_list_lock);
2018 mutex_unlock(&rio_mport_list_lock);
2020 if (port->host_deviceid >= 0)
2021 rc = port->nscan->enumerate(port, 0);
2023 rc = port->nscan->discover(port, RIO_SCAN_ENUM_NO_WAIT);
2025 module_put(port->nscan->owner);
2029 static void rio_fixup_device(struct rio_dev *dev)
2033 static int rio_init(void)
2035 struct rio_dev *dev = NULL;
2037 while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
2038 rio_fixup_device(dev);
2043 static struct workqueue_struct *rio_wq;
2045 struct rio_disc_work {
2046 struct work_struct work;
2047 struct rio_mport *mport;
2050 static void disc_work_handler(struct work_struct *_work)
2052 struct rio_disc_work *work;
2054 work = container_of(_work, struct rio_disc_work, work);
2055 pr_debug("RIO: discovery work for mport %d %s\n",
2056 work->mport->id, work->mport->name);
2057 if (try_module_get(work->mport->nscan->owner)) {
2058 work->mport->nscan->discover(work->mport, 0);
2059 module_put(work->mport->nscan->owner);
2063 int rio_init_mports(void)
2065 struct rio_mport *port;
2066 struct rio_disc_work *work;
2073 * First, run enumerations and check if we need to perform discovery
2074 * on any of the registered mports.
2076 mutex_lock(&rio_mport_list_lock);
2077 list_for_each_entry(port, &rio_mports, node) {
2078 if (port->host_deviceid >= 0) {
2079 if (port->nscan && try_module_get(port->nscan->owner)) {
2080 port->nscan->enumerate(port, 0);
2081 module_put(port->nscan->owner);
2086 mutex_unlock(&rio_mport_list_lock);
2092 * If we have mports that require discovery schedule a discovery work
2093 * for each of them. If the code below fails to allocate needed
2094 * resources, exit without error to keep results of enumeration
2096 * TODO: Implement restart of discovery process for all or
2097 * individual discovering mports.
2099 rio_wq = alloc_workqueue("riodisc", 0, 0);
2101 pr_err("RIO: unable allocate rio_wq\n");
2105 work = kcalloc(n, sizeof *work, GFP_KERNEL);
2107 pr_err("RIO: no memory for work struct\n");
2108 destroy_workqueue(rio_wq);
2113 mutex_lock(&rio_mport_list_lock);
2114 list_for_each_entry(port, &rio_mports, node) {
2115 if (port->host_deviceid < 0 && port->nscan) {
2116 work[n].mport = port;
2117 INIT_WORK(&work[n].work, disc_work_handler);
2118 queue_work(rio_wq, &work[n].work);
2123 flush_workqueue(rio_wq);
2124 mutex_unlock(&rio_mport_list_lock);
2125 pr_debug("RIO: destroy discovery workqueue\n");
2126 destroy_workqueue(rio_wq);
2135 static int rio_get_hdid(int index)
2137 if (ids_num == 0 || ids_num <= index || index >= RIO_MAX_MPORTS)
2143 int rio_mport_initialize(struct rio_mport *mport)
2145 if (next_portid >= RIO_MAX_MPORTS) {
2146 pr_err("RIO: reached specified max number of mports\n");
2150 atomic_set(&mport->state, RIO_DEVICE_INITIALIZING);
2151 mport->id = next_portid++;
2152 mport->host_deviceid = rio_get_hdid(mport->id);
2153 mport->nscan = NULL;
2154 mutex_init(&mport->lock);
2155 mport->pwe_refcnt = 0;
2156 INIT_LIST_HEAD(&mport->pwrites);
2160 EXPORT_SYMBOL_GPL(rio_mport_initialize);
2162 int rio_register_mport(struct rio_mport *port)
2164 struct rio_scan_node *scan = NULL;
2167 mutex_lock(&rio_mport_list_lock);
2170 * Check if there are any registered enumeration/discovery operations
2171 * that have to be attached to the added mport.
2173 list_for_each_entry(scan, &rio_scans, node) {
2174 if (port->id == scan->mport_id ||
2175 scan->mport_id == RIO_MPORT_ANY) {
2176 port->nscan = scan->ops;
2177 if (port->id == scan->mport_id)
2182 list_add_tail(&port->node, &rio_mports);
2183 mutex_unlock(&rio_mport_list_lock);
2185 dev_set_name(&port->dev, "rapidio%d", port->id);
2186 port->dev.class = &rio_mport_class;
2187 atomic_set(&port->state, RIO_DEVICE_RUNNING);
2189 res = device_register(&port->dev);
2191 dev_err(&port->dev, "RIO: mport%d registration failed ERR=%d\n",
2194 dev_dbg(&port->dev, "RIO: registered mport%d\n", port->id);
2198 EXPORT_SYMBOL_GPL(rio_register_mport);
2200 static int rio_mport_cleanup_callback(struct device *dev, void *data)
2202 struct rio_dev *rdev = to_rio_dev(dev);
2204 if (dev->bus == &rio_bus_type)
2205 rio_del_device(rdev, RIO_DEVICE_SHUTDOWN);
2209 static int rio_net_remove_children(struct rio_net *net)
2212 * Unregister all RapidIO devices residing on this net (this will
2213 * invoke notification of registered subsystem interfaces as well).
2215 device_for_each_child(&net->dev, NULL, rio_mport_cleanup_callback);
2219 int rio_unregister_mport(struct rio_mport *port)
2221 pr_debug("RIO: %s %s id=%d\n", __func__, port->name, port->id);
2223 /* Transition mport to the SHUTDOWN state */
2224 if (atomic_cmpxchg(&port->state,
2226 RIO_DEVICE_SHUTDOWN) != RIO_DEVICE_RUNNING) {
2227 pr_err("RIO: %s unexpected state transition for mport %s\n",
2228 __func__, port->name);
2231 if (port->net && port->net->hport == port) {
2232 rio_net_remove_children(port->net);
2233 rio_free_net(port->net);
2237 * Unregister all RapidIO devices attached to this mport (this will
2238 * invoke notification of registered subsystem interfaces as well).
2240 mutex_lock(&rio_mport_list_lock);
2241 list_del(&port->node);
2242 mutex_unlock(&rio_mport_list_lock);
2243 device_unregister(&port->dev);
2247 EXPORT_SYMBOL_GPL(rio_unregister_mport);
2249 EXPORT_SYMBOL_GPL(rio_local_get_device_id);
2250 EXPORT_SYMBOL_GPL(rio_get_device);
2251 EXPORT_SYMBOL_GPL(rio_get_asm);
2252 EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
2253 EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
2254 EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
2255 EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
2256 EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
2257 EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
2258 EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
2259 EXPORT_SYMBOL_GPL(rio_release_outb_mbox);
2260 EXPORT_SYMBOL_GPL(rio_init_mports);