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>
33 MODULE_DESCRIPTION("RapidIO Subsystem Core");
34 MODULE_AUTHOR("Matt Porter <mporter@kernel.crashing.org>");
35 MODULE_AUTHOR("Alexandre Bounine <alexandre.bounine@idt.com>");
36 MODULE_LICENSE("GPL");
38 static int hdid[RIO_MAX_MPORTS];
40 module_param_array(hdid, int, &ids_num, 0);
41 MODULE_PARM_DESC(hdid,
42 "Destination ID assignment to local RapidIO controllers");
44 static LIST_HEAD(rio_devices);
45 static DEFINE_SPINLOCK(rio_global_list_lock);
47 static LIST_HEAD(rio_mports);
48 static LIST_HEAD(rio_scans);
49 static DEFINE_MUTEX(rio_mport_list_lock);
50 static unsigned char next_portid;
51 static DEFINE_SPINLOCK(rio_mmap_lock);
54 * rio_local_get_device_id - Get the base/extended device id for a port
55 * @port: RIO master port from which to get the deviceid
57 * Reads the base/extended device id from the local device
58 * implementing the master port. Returns the 8/16-bit device
61 u16 rio_local_get_device_id(struct rio_mport *port)
65 rio_local_read_config_32(port, RIO_DID_CSR, &result);
67 return (RIO_GET_DID(port->sys_size, result));
71 * rio_add_device- Adds a RIO device to the device model
74 * Adds the RIO device to the global device list and adds the RIO
75 * device to the RIO device list. Creates the generic sysfs nodes
78 int rio_add_device(struct rio_dev *rdev)
82 err = device_add(&rdev->dev);
86 spin_lock(&rio_global_list_lock);
87 list_add_tail(&rdev->global_list, &rio_devices);
88 spin_unlock(&rio_global_list_lock);
90 rio_create_sysfs_dev_files(rdev);
94 EXPORT_SYMBOL_GPL(rio_add_device);
97 * rio_request_inb_mbox - request inbound mailbox service
98 * @mport: RIO master port from which to allocate the mailbox resource
99 * @dev_id: Device specific pointer to pass on event
100 * @mbox: Mailbox number to claim
101 * @entries: Number of entries in inbound mailbox queue
102 * @minb: Callback to execute when inbound message is received
104 * Requests ownership of an inbound mailbox resource and binds
105 * a callback function to the resource. Returns %0 on success.
107 int rio_request_inb_mbox(struct rio_mport *mport,
111 void (*minb) (struct rio_mport * mport, void *dev_id, int mbox,
115 struct resource *res;
117 if (mport->ops->open_inb_mbox == NULL)
120 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
123 rio_init_mbox_res(res, mbox, mbox);
125 /* Make sure this mailbox isn't in use */
127 request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],
133 mport->inb_msg[mbox].res = res;
135 /* Hook the inbound message callback */
136 mport->inb_msg[mbox].mcback = minb;
138 rc = mport->ops->open_inb_mbox(mport, dev_id, mbox, entries);
147 * rio_release_inb_mbox - release inbound mailbox message service
148 * @mport: RIO master port from which to release the mailbox resource
149 * @mbox: Mailbox number to release
151 * Releases ownership of an inbound mailbox resource. Returns 0
152 * if the request has been satisfied.
154 int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
156 if (mport->ops->close_inb_mbox) {
157 mport->ops->close_inb_mbox(mport, mbox);
159 /* Release the mailbox resource */
160 return release_resource(mport->inb_msg[mbox].res);
166 * rio_request_outb_mbox - request outbound mailbox service
167 * @mport: RIO master port from which to allocate the mailbox resource
168 * @dev_id: Device specific pointer to pass on event
169 * @mbox: Mailbox number to claim
170 * @entries: Number of entries in outbound mailbox queue
171 * @moutb: Callback to execute when outbound message is sent
173 * Requests ownership of an outbound mailbox resource and binds
174 * a callback function to the resource. Returns 0 on success.
176 int rio_request_outb_mbox(struct rio_mport *mport,
180 void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot))
183 struct resource *res;
185 if (mport->ops->open_outb_mbox == NULL)
188 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
191 rio_init_mbox_res(res, mbox, mbox);
193 /* Make sure this outbound mailbox isn't in use */
195 request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],
201 mport->outb_msg[mbox].res = res;
203 /* Hook the inbound message callback */
204 mport->outb_msg[mbox].mcback = moutb;
206 rc = mport->ops->open_outb_mbox(mport, dev_id, mbox, entries);
215 * rio_release_outb_mbox - release outbound mailbox message service
216 * @mport: RIO master port from which to release the mailbox resource
217 * @mbox: Mailbox number to release
219 * Releases ownership of an inbound mailbox resource. Returns 0
220 * if the request has been satisfied.
222 int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
224 if (mport->ops->close_outb_mbox) {
225 mport->ops->close_outb_mbox(mport, mbox);
227 /* Release the mailbox resource */
228 return release_resource(mport->outb_msg[mbox].res);
234 * rio_setup_inb_dbell - bind inbound doorbell callback
235 * @mport: RIO master port to bind the doorbell callback
236 * @dev_id: Device specific pointer to pass on event
237 * @res: Doorbell message resource
238 * @dinb: Callback to execute when doorbell is received
240 * Adds a doorbell resource/callback pair into a port's
241 * doorbell event list. Returns 0 if the request has been
245 rio_setup_inb_dbell(struct rio_mport *mport, void *dev_id, struct resource *res,
246 void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, u16 dst,
250 struct rio_dbell *dbell;
252 if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
259 dbell->dev_id = dev_id;
261 list_add_tail(&dbell->node, &mport->dbells);
268 * rio_request_inb_dbell - request inbound doorbell message service
269 * @mport: RIO master port from which to allocate the doorbell resource
270 * @dev_id: Device specific pointer to pass on event
271 * @start: Doorbell info range start
272 * @end: Doorbell info range end
273 * @dinb: Callback to execute when doorbell is received
275 * Requests ownership of an inbound doorbell resource and binds
276 * a callback function to the resource. Returns 0 if the request
277 * has been satisfied.
279 int rio_request_inb_dbell(struct rio_mport *mport,
283 void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src,
288 struct resource *res = kzalloc(sizeof(struct resource), GFP_KERNEL);
291 rio_init_dbell_res(res, start, end);
293 /* Make sure these doorbells aren't in use */
295 request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],
301 /* Hook the doorbell callback */
302 rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);
311 * rio_release_inb_dbell - release inbound doorbell message service
312 * @mport: RIO master port from which to release the doorbell resource
313 * @start: Doorbell info range start
314 * @end: Doorbell info range end
316 * Releases ownership of an inbound doorbell resource and removes
317 * callback from the doorbell event list. Returns 0 if the request
318 * has been satisfied.
320 int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
322 int rc = 0, found = 0;
323 struct rio_dbell *dbell;
325 list_for_each_entry(dbell, &mport->dbells, node) {
326 if ((dbell->res->start == start) && (dbell->res->end == end)) {
332 /* If we can't find an exact match, fail */
338 /* Delete from list */
339 list_del(&dbell->node);
341 /* Release the doorbell resource */
342 rc = release_resource(dbell->res);
344 /* Free the doorbell event */
352 * rio_request_outb_dbell - request outbound doorbell message range
353 * @rdev: RIO device from which to allocate the doorbell resource
354 * @start: Doorbell message range start
355 * @end: Doorbell message range end
357 * Requests ownership of a doorbell message range. Returns a resource
358 * if the request has been satisfied or %NULL on failure.
360 struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start,
363 struct resource *res = kzalloc(sizeof(struct resource), GFP_KERNEL);
366 rio_init_dbell_res(res, start, end);
368 /* Make sure these doorbells aren't in use */
369 if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)
380 * rio_release_outb_dbell - release outbound doorbell message range
381 * @rdev: RIO device from which to release the doorbell resource
382 * @res: Doorbell resource to be freed
384 * Releases ownership of a doorbell message range. Returns 0 if the
385 * request has been satisfied.
387 int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res)
389 int rc = release_resource(res);
397 * rio_request_inb_pwrite - request inbound port-write message service
398 * @rdev: RIO device to which register inbound port-write callback routine
399 * @pwcback: Callback routine to execute when port-write is received
401 * Binds a port-write callback function to the RapidIO device.
402 * Returns 0 if the request has been satisfied.
404 int rio_request_inb_pwrite(struct rio_dev *rdev,
405 int (*pwcback)(struct rio_dev *rdev, union rio_pw_msg *msg, int step))
409 spin_lock(&rio_global_list_lock);
410 if (rdev->pwcback != NULL)
413 rdev->pwcback = pwcback;
415 spin_unlock(&rio_global_list_lock);
418 EXPORT_SYMBOL_GPL(rio_request_inb_pwrite);
421 * rio_release_inb_pwrite - release inbound port-write message service
422 * @rdev: RIO device which registered for inbound port-write callback
424 * Removes callback from the rio_dev structure. Returns 0 if the request
425 * has been satisfied.
427 int rio_release_inb_pwrite(struct rio_dev *rdev)
431 spin_lock(&rio_global_list_lock);
433 rdev->pwcback = NULL;
437 spin_unlock(&rio_global_list_lock);
440 EXPORT_SYMBOL_GPL(rio_release_inb_pwrite);
443 * rio_map_inb_region -- Map inbound memory region.
444 * @mport: Master port.
445 * @local: physical address of memory region to be mapped
446 * @rbase: RIO base address assigned to this window
447 * @size: Size of the memory region
448 * @rflags: Flags for mapping.
450 * Return: 0 -- Success.
452 * This function will create the mapping from RIO space to local memory.
454 int rio_map_inb_region(struct rio_mport *mport, dma_addr_t local,
455 u64 rbase, u32 size, u32 rflags)
460 if (!mport->ops->map_inb)
462 spin_lock_irqsave(&rio_mmap_lock, flags);
463 rc = mport->ops->map_inb(mport, local, rbase, size, rflags);
464 spin_unlock_irqrestore(&rio_mmap_lock, flags);
467 EXPORT_SYMBOL_GPL(rio_map_inb_region);
470 * rio_unmap_inb_region -- Unmap the inbound memory region
471 * @mport: Master port
472 * @lstart: physical address of memory region to be unmapped
474 void rio_unmap_inb_region(struct rio_mport *mport, dma_addr_t lstart)
477 if (!mport->ops->unmap_inb)
479 spin_lock_irqsave(&rio_mmap_lock, flags);
480 mport->ops->unmap_inb(mport, lstart);
481 spin_unlock_irqrestore(&rio_mmap_lock, flags);
483 EXPORT_SYMBOL_GPL(rio_unmap_inb_region);
486 * rio_mport_get_physefb - Helper function that returns register offset
487 * for Physical Layer Extended Features Block.
488 * @port: Master port to issue transaction
489 * @local: Indicate a local master port or remote device access
490 * @destid: Destination ID of the device
491 * @hopcount: Number of switch hops to the device
494 rio_mport_get_physefb(struct rio_mport *port, int local,
495 u16 destid, u8 hopcount)
500 ext_ftr_ptr = rio_mport_get_efb(port, local, destid, hopcount, 0);
502 while (ext_ftr_ptr) {
504 rio_local_read_config_32(port, ext_ftr_ptr,
507 rio_mport_read_config_32(port, destid, hopcount,
508 ext_ftr_ptr, &ftr_header);
510 ftr_header = RIO_GET_BLOCK_ID(ftr_header);
511 switch (ftr_header) {
513 case RIO_EFB_SER_EP_ID_V13P:
514 case RIO_EFB_SER_EP_REC_ID_V13P:
515 case RIO_EFB_SER_EP_FREE_ID_V13P:
516 case RIO_EFB_SER_EP_ID:
517 case RIO_EFB_SER_EP_REC_ID:
518 case RIO_EFB_SER_EP_FREE_ID:
519 case RIO_EFB_SER_EP_FREC_ID:
527 ext_ftr_ptr = rio_mport_get_efb(port, local, destid,
528 hopcount, ext_ftr_ptr);
533 EXPORT_SYMBOL_GPL(rio_mport_get_physefb);
536 * rio_get_comptag - Begin or continue searching for a RIO device by component tag
537 * @comp_tag: RIO component tag to match
538 * @from: Previous RIO device found in search, or %NULL for new search
540 * Iterates through the list of known RIO devices. If a RIO device is
541 * found with a matching @comp_tag, a pointer to its device
542 * structure is returned. Otherwise, %NULL is returned. A new search
543 * is initiated by passing %NULL to the @from argument. Otherwise, if
544 * @from is not %NULL, searches continue from next device on the global
547 struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from)
550 struct rio_dev *rdev;
552 spin_lock(&rio_global_list_lock);
553 n = from ? from->global_list.next : rio_devices.next;
555 while (n && (n != &rio_devices)) {
557 if (rdev->comp_tag == comp_tag)
563 spin_unlock(&rio_global_list_lock);
566 EXPORT_SYMBOL_GPL(rio_get_comptag);
569 * rio_set_port_lockout - Sets/clears LOCKOUT bit (RIO EM 1.3) for a switch port.
570 * @rdev: Pointer to RIO device control structure
571 * @pnum: Switch port number to set LOCKOUT bit
572 * @lock: Operation : set (=1) or clear (=0)
574 int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock)
578 rio_read_config_32(rdev,
579 rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
582 regval |= RIO_PORT_N_CTL_LOCKOUT;
584 regval &= ~RIO_PORT_N_CTL_LOCKOUT;
586 rio_write_config_32(rdev,
587 rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
591 EXPORT_SYMBOL_GPL(rio_set_port_lockout);
594 * rio_enable_rx_tx_port - enable input receiver and output transmitter of
596 * @port: Master port associated with the RIO network
597 * @local: local=1 select local port otherwise a far device is reached
598 * @destid: Destination ID of the device to check host bit
599 * @hopcount: Number of hops to reach the target
600 * @port_num: Port (-number on switch) to enable on a far end device
602 * Returns 0 or 1 from on General Control Command and Status Register
605 int rio_enable_rx_tx_port(struct rio_mport *port,
606 int local, u16 destid,
607 u8 hopcount, u8 port_num)
609 #ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
614 * enable rx input tx output port
616 pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
617 "%d, port_num = %d)\n", local, destid, hopcount, port_num);
619 ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
622 rio_local_read_config_32(port, ext_ftr_ptr +
623 RIO_PORT_N_CTL_CSR(0),
626 if (rio_mport_read_config_32(port, destid, hopcount,
627 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), ®val) < 0)
631 if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
633 regval = regval | RIO_PORT_N_CTL_EN_RX_SER
634 | RIO_PORT_N_CTL_EN_TX_SER;
637 regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
638 | RIO_PORT_N_CTL_EN_TX_PAR;
642 rio_local_write_config_32(port, ext_ftr_ptr +
643 RIO_PORT_N_CTL_CSR(0), regval);
645 if (rio_mport_write_config_32(port, destid, hopcount,
646 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
652 EXPORT_SYMBOL_GPL(rio_enable_rx_tx_port);
656 * rio_chk_dev_route - Validate route to the specified device.
657 * @rdev: RIO device failed to respond
658 * @nrdev: Last active device on the route to rdev
659 * @npnum: nrdev's port number on the route to rdev
661 * Follows a route to the specified RIO device to determine the last available
662 * device (and corresponding RIO port) on the route.
665 rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum)
668 int p_port, rc = -EIO;
669 struct rio_dev *prev = NULL;
671 /* Find switch with failed RIO link */
672 while (rdev->prev && (rdev->prev->pef & RIO_PEF_SWITCH)) {
673 if (!rio_read_config_32(rdev->prev, RIO_DEV_ID_CAR, &result)) {
683 p_port = prev->rswitch->route_table[rdev->destid];
685 if (p_port != RIO_INVALID_ROUTE) {
686 pr_debug("RIO: link failed on [%s]-P%d\n",
687 rio_name(prev), p_port);
692 pr_debug("RIO: failed to trace route to %s\n", rio_name(rdev));
698 * rio_mport_chk_dev_access - Validate access to the specified device.
699 * @mport: Master port to send transactions
700 * @destid: Device destination ID in network
701 * @hopcount: Number of hops into the network
704 rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount)
709 while (rio_mport_read_config_32(mport, destid, hopcount,
710 RIO_DEV_ID_CAR, &tmp)) {
712 if (i == RIO_MAX_CHK_RETRY)
719 EXPORT_SYMBOL_GPL(rio_mport_chk_dev_access);
722 * rio_chk_dev_access - Validate access to the specified device.
723 * @rdev: Pointer to RIO device control structure
725 static int rio_chk_dev_access(struct rio_dev *rdev)
727 return rio_mport_chk_dev_access(rdev->net->hport,
728 rdev->destid, rdev->hopcount);
732 * rio_get_input_status - Sends a Link-Request/Input-Status control symbol and
733 * returns link-response (if requested).
734 * @rdev: RIO devive to issue Input-status command
735 * @pnum: Device port number to issue the command
736 * @lnkresp: Response from a link partner
739 rio_get_input_status(struct rio_dev *rdev, int pnum, u32 *lnkresp)
745 /* Read from link maintenance response register
746 * to clear valid bit */
747 rio_read_config_32(rdev,
748 rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
753 /* Issue Input-status command */
754 rio_write_config_32(rdev,
755 rdev->phys_efptr + RIO_PORT_N_MNT_REQ_CSR(pnum),
758 /* Exit if the response is not expected */
763 while (checkcount--) {
765 rio_read_config_32(rdev,
766 rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
768 if (regval & RIO_PORT_N_MNT_RSP_RVAL) {
778 * rio_clr_err_stopped - Clears port Error-stopped states.
779 * @rdev: Pointer to RIO device control structure
780 * @pnum: Switch port number to clear errors
781 * @err_status: port error status (if 0 reads register from device)
783 static int rio_clr_err_stopped(struct rio_dev *rdev, u32 pnum, u32 err_status)
785 struct rio_dev *nextdev = rdev->rswitch->nextdev[pnum];
787 u32 far_ackid, far_linkstat, near_ackid;
790 rio_read_config_32(rdev,
791 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
794 if (err_status & RIO_PORT_N_ERR_STS_PW_OUT_ES) {
795 pr_debug("RIO_EM: servicing Output Error-Stopped state\n");
797 * Send a Link-Request/Input-Status control symbol
799 if (rio_get_input_status(rdev, pnum, ®val)) {
800 pr_debug("RIO_EM: Input-status response timeout\n");
804 pr_debug("RIO_EM: SP%d Input-status response=0x%08x\n",
806 far_ackid = (regval & RIO_PORT_N_MNT_RSP_ASTAT) >> 5;
807 far_linkstat = regval & RIO_PORT_N_MNT_RSP_LSTAT;
808 rio_read_config_32(rdev,
809 rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
811 pr_debug("RIO_EM: SP%d_ACK_STS_CSR=0x%08x\n", pnum, regval);
812 near_ackid = (regval & RIO_PORT_N_ACK_INBOUND) >> 24;
813 pr_debug("RIO_EM: SP%d far_ackID=0x%02x far_linkstat=0x%02x" \
814 " near_ackID=0x%02x\n",
815 pnum, far_ackid, far_linkstat, near_ackid);
818 * If required, synchronize ackIDs of near and
821 if ((far_ackid != ((regval & RIO_PORT_N_ACK_OUTSTAND) >> 8)) ||
822 (far_ackid != (regval & RIO_PORT_N_ACK_OUTBOUND))) {
823 /* Align near outstanding/outbound ackIDs with
826 rio_write_config_32(rdev,
827 rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
829 (far_ackid << 8) | far_ackid);
830 /* Align far outstanding/outbound ackIDs with
835 rio_write_config_32(nextdev,
836 nextdev->phys_efptr +
837 RIO_PORT_N_ACK_STS_CSR(RIO_GET_PORT_NUM(nextdev->swpinfo)),
839 (near_ackid << 8) | near_ackid);
841 pr_debug("RIO_EM: Invalid nextdev pointer (NULL)\n");
844 rio_read_config_32(rdev,
845 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
847 pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
850 if ((err_status & RIO_PORT_N_ERR_STS_PW_INP_ES) && nextdev) {
851 pr_debug("RIO_EM: servicing Input Error-Stopped state\n");
852 rio_get_input_status(nextdev,
853 RIO_GET_PORT_NUM(nextdev->swpinfo), NULL);
856 rio_read_config_32(rdev,
857 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
859 pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
862 return (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
863 RIO_PORT_N_ERR_STS_PW_INP_ES)) ? 1 : 0;
867 * rio_inb_pwrite_handler - process inbound port-write message
868 * @pw_msg: pointer to inbound port-write message
870 * Processes an inbound port-write message. Returns 0 if the request
871 * has been satisfied.
873 int rio_inb_pwrite_handler(union rio_pw_msg *pw_msg)
875 struct rio_dev *rdev;
876 u32 err_status, em_perrdet, em_ltlerrdet;
879 rdev = rio_get_comptag((pw_msg->em.comptag & RIO_CTAG_UDEVID), NULL);
881 /* Device removed or enumeration error */
882 pr_debug("RIO: %s No matching device for CTag 0x%08x\n",
883 __func__, pw_msg->em.comptag);
887 pr_debug("RIO: Port-Write message from %s\n", rio_name(rdev));
892 for (i = 0; i < RIO_PW_MSG_SIZE/sizeof(u32);) {
893 pr_debug("0x%02x: %08x %08x %08x %08x\n",
894 i*4, pw_msg->raw[i], pw_msg->raw[i + 1],
895 pw_msg->raw[i + 2], pw_msg->raw[i + 3]);
901 /* Call an external service function (if such is registered
902 * for this device). This may be the service for endpoints that send
903 * device-specific port-write messages. End-point messages expected
904 * to be handled completely by EP specific device driver.
905 * For switches rc==0 signals that no standard processing required.
907 if (rdev->pwcback != NULL) {
908 rc = rdev->pwcback(rdev, pw_msg, 0);
913 portnum = pw_msg->em.is_port & 0xFF;
915 /* Check if device and route to it are functional:
916 * Sometimes devices may send PW message(s) just before being
917 * powered down (or link being lost).
919 if (rio_chk_dev_access(rdev)) {
920 pr_debug("RIO: device access failed - get link partner\n");
921 /* Scan route to the device and identify failed link.
922 * This will replace device and port reported in PW message.
923 * PW message should not be used after this point.
925 if (rio_chk_dev_route(rdev, &rdev, &portnum)) {
926 pr_err("RIO: Route trace for %s failed\n",
933 /* For End-point devices processing stops here */
934 if (!(rdev->pef & RIO_PEF_SWITCH))
937 if (rdev->phys_efptr == 0) {
938 pr_err("RIO_PW: Bad switch initialization for %s\n",
944 * Process the port-write notification from switch
946 if (rdev->rswitch->ops && rdev->rswitch->ops->em_handle)
947 rdev->rswitch->ops->em_handle(rdev, portnum);
949 rio_read_config_32(rdev,
950 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
952 pr_debug("RIO_PW: SP%d_ERR_STS_CSR=0x%08x\n", portnum, err_status);
954 if (err_status & RIO_PORT_N_ERR_STS_PORT_OK) {
956 if (!(rdev->rswitch->port_ok & (1 << portnum))) {
957 rdev->rswitch->port_ok |= (1 << portnum);
958 rio_set_port_lockout(rdev, portnum, 0);
959 /* Schedule Insertion Service */
960 pr_debug("RIO_PW: Device Insertion on [%s]-P%d\n",
961 rio_name(rdev), portnum);
964 /* Clear error-stopped states (if reported).
965 * Depending on the link partner state, two attempts
966 * may be needed for successful recovery.
968 if (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
969 RIO_PORT_N_ERR_STS_PW_INP_ES)) {
970 if (rio_clr_err_stopped(rdev, portnum, err_status))
971 rio_clr_err_stopped(rdev, portnum, 0);
973 } else { /* if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT) */
975 if (rdev->rswitch->port_ok & (1 << portnum)) {
976 rdev->rswitch->port_ok &= ~(1 << portnum);
977 rio_set_port_lockout(rdev, portnum, 1);
979 rio_write_config_32(rdev,
981 RIO_PORT_N_ACK_STS_CSR(portnum),
982 RIO_PORT_N_ACK_CLEAR);
984 /* Schedule Extraction Service */
985 pr_debug("RIO_PW: Device Extraction on [%s]-P%d\n",
986 rio_name(rdev), portnum);
990 rio_read_config_32(rdev,
991 rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), &em_perrdet);
993 pr_debug("RIO_PW: RIO_EM_P%d_ERR_DETECT=0x%08x\n",
994 portnum, em_perrdet);
995 /* Clear EM Port N Error Detect CSR */
996 rio_write_config_32(rdev,
997 rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), 0);
1000 rio_read_config_32(rdev,
1001 rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, &em_ltlerrdet);
1003 pr_debug("RIO_PW: RIO_EM_LTL_ERR_DETECT=0x%08x\n",
1005 /* Clear EM L/T Layer Error Detect CSR */
1006 rio_write_config_32(rdev,
1007 rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, 0);
1010 /* Clear remaining error bits and Port-Write Pending bit */
1011 rio_write_config_32(rdev,
1012 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
1017 EXPORT_SYMBOL_GPL(rio_inb_pwrite_handler);
1020 * rio_mport_get_efb - get pointer to next extended features block
1021 * @port: Master port to issue transaction
1022 * @local: Indicate a local master port or remote device access
1023 * @destid: Destination ID of the device
1024 * @hopcount: Number of switch hops to the device
1025 * @from: Offset of current Extended Feature block header (if 0 starts
1026 * from ExtFeaturePtr)
1029 rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,
1030 u8 hopcount, u32 from)
1036 rio_local_read_config_32(port, RIO_ASM_INFO_CAR,
1039 rio_mport_read_config_32(port, destid, hopcount,
1040 RIO_ASM_INFO_CAR, ®_val);
1041 return reg_val & RIO_EXT_FTR_PTR_MASK;
1044 rio_local_read_config_32(port, from, ®_val);
1046 rio_mport_read_config_32(port, destid, hopcount,
1048 return RIO_GET_BLOCK_ID(reg_val);
1051 EXPORT_SYMBOL_GPL(rio_mport_get_efb);
1054 * rio_mport_get_feature - query for devices' extended features
1055 * @port: Master port to issue transaction
1056 * @local: Indicate a local master port or remote device access
1057 * @destid: Destination ID of the device
1058 * @hopcount: Number of switch hops to the device
1059 * @ftr: Extended feature code
1061 * Tell if a device supports a given RapidIO capability.
1062 * Returns the offset of the requested extended feature
1063 * block within the device's RIO configuration space or
1064 * 0 in case the device does not support it. Possible
1067 * %RIO_EFB_PAR_EP_ID LP/LVDS EP Devices
1069 * %RIO_EFB_PAR_EP_REC_ID LP/LVDS EP Recovery Devices
1071 * %RIO_EFB_PAR_EP_FREE_ID LP/LVDS EP Free Devices
1073 * %RIO_EFB_SER_EP_ID LP/Serial EP Devices
1075 * %RIO_EFB_SER_EP_REC_ID LP/Serial EP Recovery Devices
1077 * %RIO_EFB_SER_EP_FREE_ID LP/Serial EP Free Devices
1080 rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
1081 u8 hopcount, int ftr)
1083 u32 asm_info, ext_ftr_ptr, ftr_header;
1086 rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);
1088 rio_mport_read_config_32(port, destid, hopcount,
1089 RIO_ASM_INFO_CAR, &asm_info);
1091 ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;
1093 while (ext_ftr_ptr) {
1095 rio_local_read_config_32(port, ext_ftr_ptr,
1098 rio_mport_read_config_32(port, destid, hopcount,
1099 ext_ftr_ptr, &ftr_header);
1100 if (RIO_GET_BLOCK_ID(ftr_header) == ftr)
1102 if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header)))
1108 EXPORT_SYMBOL_GPL(rio_mport_get_feature);
1111 * rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
1112 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
1113 * @did: RIO did to match or %RIO_ANY_ID to match all dids
1114 * @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids
1115 * @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids
1116 * @from: Previous RIO device found in search, or %NULL for new search
1118 * Iterates through the list of known RIO devices. If a RIO device is
1119 * found with a matching @vid, @did, @asm_vid, @asm_did, the reference
1120 * count to the device is incrememted and a pointer to its device
1121 * structure is returned. Otherwise, %NULL is returned. A new search
1122 * is initiated by passing %NULL to the @from argument. Otherwise, if
1123 * @from is not %NULL, searches continue from next device on the global
1124 * list. The reference count for @from is always decremented if it is
1127 struct rio_dev *rio_get_asm(u16 vid, u16 did,
1128 u16 asm_vid, u16 asm_did, struct rio_dev *from)
1130 struct list_head *n;
1131 struct rio_dev *rdev;
1133 WARN_ON(in_interrupt());
1134 spin_lock(&rio_global_list_lock);
1135 n = from ? from->global_list.next : rio_devices.next;
1137 while (n && (n != &rio_devices)) {
1138 rdev = rio_dev_g(n);
1139 if ((vid == RIO_ANY_ID || rdev->vid == vid) &&
1140 (did == RIO_ANY_ID || rdev->did == did) &&
1141 (asm_vid == RIO_ANY_ID || rdev->asm_vid == asm_vid) &&
1142 (asm_did == RIO_ANY_ID || rdev->asm_did == asm_did))
1149 rdev = rio_dev_get(rdev);
1150 spin_unlock(&rio_global_list_lock);
1155 * rio_get_device - Begin or continue searching for a RIO device by vid/did
1156 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
1157 * @did: RIO did to match or %RIO_ANY_ID to match all dids
1158 * @from: Previous RIO device found in search, or %NULL for new search
1160 * Iterates through the list of known RIO devices. If a RIO device is
1161 * found with a matching @vid and @did, the reference count to the
1162 * device is incrememted and a pointer to its device structure is returned.
1163 * Otherwise, %NULL is returned. A new search is initiated by passing %NULL
1164 * to the @from argument. Otherwise, if @from is not %NULL, searches
1165 * continue from next device on the global list. The reference count for
1166 * @from is always decremented if it is not %NULL.
1168 struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from)
1170 return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
1174 * rio_std_route_add_entry - Add switch route table entry using standard
1175 * registers defined in RIO specification rev.1.3
1176 * @mport: Master port to issue transaction
1177 * @destid: Destination ID of the device
1178 * @hopcount: Number of switch hops to the device
1179 * @table: routing table ID (global or port-specific)
1180 * @route_destid: destID entry in the RT
1181 * @route_port: destination port for specified destID
1184 rio_std_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1185 u16 table, u16 route_destid, u8 route_port)
1187 if (table == RIO_GLOBAL_TABLE) {
1188 rio_mport_write_config_32(mport, destid, hopcount,
1189 RIO_STD_RTE_CONF_DESTID_SEL_CSR,
1191 rio_mport_write_config_32(mport, destid, hopcount,
1192 RIO_STD_RTE_CONF_PORT_SEL_CSR,
1201 * rio_std_route_get_entry - Read switch route table entry (port number)
1202 * associated with specified destID using standard registers defined in RIO
1203 * specification rev.1.3
1204 * @mport: Master port to issue transaction
1205 * @destid: Destination ID of the device
1206 * @hopcount: Number of switch hops to the device
1207 * @table: routing table ID (global or port-specific)
1208 * @route_destid: destID entry in the RT
1209 * @route_port: returned destination port for specified destID
1212 rio_std_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1213 u16 table, u16 route_destid, u8 *route_port)
1217 if (table == RIO_GLOBAL_TABLE) {
1218 rio_mport_write_config_32(mport, destid, hopcount,
1219 RIO_STD_RTE_CONF_DESTID_SEL_CSR, route_destid);
1220 rio_mport_read_config_32(mport, destid, hopcount,
1221 RIO_STD_RTE_CONF_PORT_SEL_CSR, &result);
1223 *route_port = (u8)result;
1230 * rio_std_route_clr_table - Clear swotch route table using standard registers
1231 * defined in RIO specification rev.1.3.
1232 * @mport: Master port to issue transaction
1233 * @destid: Destination ID of the device
1234 * @hopcount: Number of switch hops to the device
1235 * @table: routing table ID (global or port-specific)
1238 rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
1241 u32 max_destid = 0xff;
1242 u32 i, pef, id_inc = 1, ext_cfg = 0;
1243 u32 port_sel = RIO_INVALID_ROUTE;
1245 if (table == RIO_GLOBAL_TABLE) {
1246 rio_mport_read_config_32(mport, destid, hopcount,
1249 if (mport->sys_size) {
1250 rio_mport_read_config_32(mport, destid, hopcount,
1251 RIO_SWITCH_RT_LIMIT,
1253 max_destid &= RIO_RT_MAX_DESTID;
1256 if (pef & RIO_PEF_EXT_RT) {
1257 ext_cfg = 0x80000000;
1259 port_sel = (RIO_INVALID_ROUTE << 24) |
1260 (RIO_INVALID_ROUTE << 16) |
1261 (RIO_INVALID_ROUTE << 8) |
1265 for (i = 0; i <= max_destid;) {
1266 rio_mport_write_config_32(mport, destid, hopcount,
1267 RIO_STD_RTE_CONF_DESTID_SEL_CSR,
1269 rio_mport_write_config_32(mport, destid, hopcount,
1270 RIO_STD_RTE_CONF_PORT_SEL_CSR,
1281 * rio_lock_device - Acquires host device lock for specified device
1282 * @port: Master port to send transaction
1283 * @destid: Destination ID for device/switch
1284 * @hopcount: Hopcount to reach switch
1285 * @wait_ms: Max wait time in msec (0 = no timeout)
1287 * Attepts to acquire host device lock for specified device
1288 * Returns 0 if device lock acquired or EINVAL if timeout expires.
1290 int rio_lock_device(struct rio_mport *port, u16 destid,
1291 u8 hopcount, int wait_ms)
1296 /* Attempt to acquire device lock */
1297 rio_mport_write_config_32(port, destid, hopcount,
1298 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
1299 rio_mport_read_config_32(port, destid, hopcount,
1300 RIO_HOST_DID_LOCK_CSR, &result);
1302 while (result != port->host_deviceid) {
1303 if (wait_ms != 0 && tcnt == wait_ms) {
1304 pr_debug("RIO: timeout when locking device %x:%x\n",
1312 /* Try to acquire device lock again */
1313 rio_mport_write_config_32(port, destid,
1315 RIO_HOST_DID_LOCK_CSR,
1316 port->host_deviceid);
1317 rio_mport_read_config_32(port, destid,
1319 RIO_HOST_DID_LOCK_CSR, &result);
1324 EXPORT_SYMBOL_GPL(rio_lock_device);
1327 * rio_unlock_device - Releases host device lock for specified device
1328 * @port: Master port to send transaction
1329 * @destid: Destination ID for device/switch
1330 * @hopcount: Hopcount to reach switch
1332 * Returns 0 if device lock released or EINVAL if fails.
1334 int rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
1338 /* Release device lock */
1339 rio_mport_write_config_32(port, destid,
1341 RIO_HOST_DID_LOCK_CSR,
1342 port->host_deviceid);
1343 rio_mport_read_config_32(port, destid, hopcount,
1344 RIO_HOST_DID_LOCK_CSR, &result);
1345 if ((result & 0xffff) != 0xffff) {
1346 pr_debug("RIO: badness when releasing device lock %x:%x\n",
1353 EXPORT_SYMBOL_GPL(rio_unlock_device);
1356 * rio_route_add_entry- Add a route entry to a switch routing table
1358 * @table: Routing table ID
1359 * @route_destid: Destination ID to be routed
1360 * @route_port: Port number to be routed
1361 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
1363 * If available calls the switch specific add_entry() method to add a route
1364 * entry into a switch routing table. Otherwise uses standard RT update method
1365 * as defined by RapidIO specification. A specific routing table can be selected
1366 * using the @table argument if a switch has per port routing tables or
1367 * the standard (or global) table may be used by passing
1368 * %RIO_GLOBAL_TABLE in @table.
1370 * Returns %0 on success or %-EINVAL on failure.
1372 int rio_route_add_entry(struct rio_dev *rdev,
1373 u16 table, u16 route_destid, u8 route_port, int lock)
1376 struct rio_switch_ops *ops = rdev->rswitch->ops;
1379 rc = rio_lock_device(rdev->net->hport, rdev->destid,
1380 rdev->hopcount, 1000);
1385 spin_lock(&rdev->rswitch->lock);
1387 if (ops == NULL || ops->add_entry == NULL) {
1388 rc = rio_std_route_add_entry(rdev->net->hport, rdev->destid,
1389 rdev->hopcount, table,
1390 route_destid, route_port);
1391 } else if (try_module_get(ops->owner)) {
1392 rc = ops->add_entry(rdev->net->hport, rdev->destid,
1393 rdev->hopcount, table, route_destid,
1395 module_put(ops->owner);
1398 spin_unlock(&rdev->rswitch->lock);
1401 rio_unlock_device(rdev->net->hport, rdev->destid,
1406 EXPORT_SYMBOL_GPL(rio_route_add_entry);
1409 * rio_route_get_entry- Read an entry from a switch routing table
1411 * @table: Routing table ID
1412 * @route_destid: Destination ID to be routed
1413 * @route_port: Pointer to read port number into
1414 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
1416 * If available calls the switch specific get_entry() method to fetch a route
1417 * entry from a switch routing table. Otherwise uses standard RT read method
1418 * as defined by RapidIO specification. A specific routing table can be selected
1419 * using the @table argument if a switch has per port routing tables or
1420 * the standard (or global) table may be used by passing
1421 * %RIO_GLOBAL_TABLE in @table.
1423 * Returns %0 on success or %-EINVAL on failure.
1425 int rio_route_get_entry(struct rio_dev *rdev, u16 table,
1426 u16 route_destid, u8 *route_port, int lock)
1429 struct rio_switch_ops *ops = rdev->rswitch->ops;
1432 rc = rio_lock_device(rdev->net->hport, rdev->destid,
1433 rdev->hopcount, 1000);
1438 spin_lock(&rdev->rswitch->lock);
1440 if (ops == NULL || ops->get_entry == NULL) {
1441 rc = rio_std_route_get_entry(rdev->net->hport, rdev->destid,
1442 rdev->hopcount, table,
1443 route_destid, route_port);
1444 } else if (try_module_get(ops->owner)) {
1445 rc = ops->get_entry(rdev->net->hport, rdev->destid,
1446 rdev->hopcount, table, route_destid,
1448 module_put(ops->owner);
1451 spin_unlock(&rdev->rswitch->lock);
1454 rio_unlock_device(rdev->net->hport, rdev->destid,
1458 EXPORT_SYMBOL_GPL(rio_route_get_entry);
1461 * rio_route_clr_table - Clear a switch routing table
1463 * @table: Routing table ID
1464 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
1466 * If available calls the switch specific clr_table() method to clear a switch
1467 * routing table. Otherwise uses standard RT write method as defined by RapidIO
1468 * specification. A specific routing table can be selected using the @table
1469 * argument if a switch has per port routing tables or the standard (or global)
1470 * table may be used by passing %RIO_GLOBAL_TABLE in @table.
1472 * Returns %0 on success or %-EINVAL on failure.
1474 int rio_route_clr_table(struct rio_dev *rdev, u16 table, int lock)
1477 struct rio_switch_ops *ops = rdev->rswitch->ops;
1480 rc = rio_lock_device(rdev->net->hport, rdev->destid,
1481 rdev->hopcount, 1000);
1486 spin_lock(&rdev->rswitch->lock);
1488 if (ops == NULL || ops->clr_table == NULL) {
1489 rc = rio_std_route_clr_table(rdev->net->hport, rdev->destid,
1490 rdev->hopcount, table);
1491 } else if (try_module_get(ops->owner)) {
1492 rc = ops->clr_table(rdev->net->hport, rdev->destid,
1493 rdev->hopcount, table);
1495 module_put(ops->owner);
1498 spin_unlock(&rdev->rswitch->lock);
1501 rio_unlock_device(rdev->net->hport, rdev->destid,
1506 EXPORT_SYMBOL_GPL(rio_route_clr_table);
1508 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1510 static bool rio_chan_filter(struct dma_chan *chan, void *arg)
1512 struct rio_mport *mport = arg;
1514 /* Check that DMA device belongs to the right MPORT */
1515 return mport == container_of(chan->device, struct rio_mport, dma);
1519 * rio_request_mport_dma - request RapidIO capable DMA channel associated
1520 * with specified local RapidIO mport device.
1521 * @mport: RIO mport to perform DMA data transfers
1523 * Returns pointer to allocated DMA channel or NULL if failed.
1525 struct dma_chan *rio_request_mport_dma(struct rio_mport *mport)
1527 dma_cap_mask_t mask;
1530 dma_cap_set(DMA_SLAVE, mask);
1531 return dma_request_channel(mask, rio_chan_filter, mport);
1533 EXPORT_SYMBOL_GPL(rio_request_mport_dma);
1536 * rio_request_dma - request RapidIO capable DMA channel that supports
1537 * specified target RapidIO device.
1538 * @rdev: RIO device associated with DMA transfer
1540 * Returns pointer to allocated DMA channel or NULL if failed.
1542 struct dma_chan *rio_request_dma(struct rio_dev *rdev)
1544 return rio_request_mport_dma(rdev->net->hport);
1546 EXPORT_SYMBOL_GPL(rio_request_dma);
1549 * rio_release_dma - release specified DMA channel
1550 * @dchan: DMA channel to release
1552 void rio_release_dma(struct dma_chan *dchan)
1554 dma_release_channel(dchan);
1556 EXPORT_SYMBOL_GPL(rio_release_dma);
1559 * rio_dma_prep_xfer - RapidIO specific wrapper
1560 * for device_prep_slave_sg callback defined by DMAENGINE.
1561 * @dchan: DMA channel to configure
1562 * @destid: target RapidIO device destination ID
1563 * @data: RIO specific data descriptor
1564 * @direction: DMA data transfer direction (TO or FROM the device)
1565 * @flags: dmaengine defined flags
1567 * Initializes RapidIO capable DMA channel for the specified data transfer.
1568 * Uses DMA channel private extension to pass information related to remote
1569 * target RIO device.
1570 * Returns pointer to DMA transaction descriptor or NULL if failed.
1572 struct dma_async_tx_descriptor *rio_dma_prep_xfer(struct dma_chan *dchan,
1573 u16 destid, struct rio_dma_data *data,
1574 enum dma_transfer_direction direction, unsigned long flags)
1576 struct rio_dma_ext rio_ext;
1578 if (dchan->device->device_prep_slave_sg == NULL) {
1579 pr_err("%s: prep_rio_sg == NULL\n", __func__);
1583 rio_ext.destid = destid;
1584 rio_ext.rio_addr_u = data->rio_addr_u;
1585 rio_ext.rio_addr = data->rio_addr;
1586 rio_ext.wr_type = data->wr_type;
1588 return dmaengine_prep_rio_sg(dchan, data->sg, data->sg_len,
1589 direction, flags, &rio_ext);
1591 EXPORT_SYMBOL_GPL(rio_dma_prep_xfer);
1594 * rio_dma_prep_slave_sg - RapidIO specific wrapper
1595 * for device_prep_slave_sg callback defined by DMAENGINE.
1596 * @rdev: RIO device control structure
1597 * @dchan: DMA channel to configure
1598 * @data: RIO specific data descriptor
1599 * @direction: DMA data transfer direction (TO or FROM the device)
1600 * @flags: dmaengine defined flags
1602 * Initializes RapidIO capable DMA channel for the specified data transfer.
1603 * Uses DMA channel private extension to pass information related to remote
1604 * target RIO device.
1605 * Returns pointer to DMA transaction descriptor or NULL if failed.
1607 struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(struct rio_dev *rdev,
1608 struct dma_chan *dchan, struct rio_dma_data *data,
1609 enum dma_transfer_direction direction, unsigned long flags)
1611 return rio_dma_prep_xfer(dchan, rdev->destid, data, direction, flags);
1613 EXPORT_SYMBOL_GPL(rio_dma_prep_slave_sg);
1615 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1618 * rio_find_mport - find RIO mport by its ID
1619 * @mport_id: number (ID) of mport device
1621 * Given a RIO mport number, the desired mport is located
1622 * in the global list of mports. If the mport is found, a pointer to its
1623 * data structure is returned. If no mport is found, %NULL is returned.
1625 struct rio_mport *rio_find_mport(int mport_id)
1627 struct rio_mport *port;
1629 mutex_lock(&rio_mport_list_lock);
1630 list_for_each_entry(port, &rio_mports, node) {
1631 if (port->id == mport_id)
1636 mutex_unlock(&rio_mport_list_lock);
1642 * rio_register_scan - enumeration/discovery method registration interface
1643 * @mport_id: mport device ID for which fabric scan routine has to be set
1644 * (RIO_MPORT_ANY = set for all available mports)
1645 * @scan_ops: enumeration/discovery operations structure
1647 * Registers enumeration/discovery operations with RapidIO subsystem and
1648 * attaches it to the specified mport device (or all available mports
1649 * if RIO_MPORT_ANY is specified).
1651 * Returns error if the mport already has an enumerator attached to it.
1652 * In case of RIO_MPORT_ANY skips mports with valid scan routines (no error).
1654 int rio_register_scan(int mport_id, struct rio_scan *scan_ops)
1656 struct rio_mport *port;
1657 struct rio_scan_node *scan;
1660 pr_debug("RIO: %s for mport_id=%d\n", __func__, mport_id);
1662 if ((mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS) ||
1666 mutex_lock(&rio_mport_list_lock);
1669 * Check if there is another enumerator already registered for
1670 * the same mport ID (including RIO_MPORT_ANY). Multiple enumerators
1671 * for the same mport ID are not supported.
1673 list_for_each_entry(scan, &rio_scans, node) {
1674 if (scan->mport_id == mport_id) {
1681 * Allocate and initialize new scan registration node.
1683 scan = kzalloc(sizeof(*scan), GFP_KERNEL);
1689 scan->mport_id = mport_id;
1690 scan->ops = scan_ops;
1693 * Traverse the list of registered mports to attach this new scan.
1695 * The new scan with matching mport ID overrides any previously attached
1696 * scan assuming that old scan (if any) is the default one (based on the
1697 * enumerator registration check above).
1698 * If the new scan is the global one, it will be attached only to mports
1699 * that do not have their own individual operations already attached.
1701 list_for_each_entry(port, &rio_mports, node) {
1702 if (port->id == mport_id) {
1703 port->nscan = scan_ops;
1705 } else if (mport_id == RIO_MPORT_ANY && !port->nscan)
1706 port->nscan = scan_ops;
1709 list_add_tail(&scan->node, &rio_scans);
1712 mutex_unlock(&rio_mport_list_lock);
1716 EXPORT_SYMBOL_GPL(rio_register_scan);
1719 * rio_unregister_scan - removes enumeration/discovery method from mport
1720 * @mport_id: mport device ID for which fabric scan routine has to be
1721 * unregistered (RIO_MPORT_ANY = apply to all mports that use
1722 * the specified scan_ops)
1723 * @scan_ops: enumeration/discovery operations structure
1725 * Removes enumeration or discovery method assigned to the specified mport
1726 * device. If RIO_MPORT_ANY is specified, removes the specified operations from
1727 * all mports that have them attached.
1729 int rio_unregister_scan(int mport_id, struct rio_scan *scan_ops)
1731 struct rio_mport *port;
1732 struct rio_scan_node *scan;
1734 pr_debug("RIO: %s for mport_id=%d\n", __func__, mport_id);
1736 if (mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS)
1739 mutex_lock(&rio_mport_list_lock);
1741 list_for_each_entry(port, &rio_mports, node)
1742 if (port->id == mport_id ||
1743 (mport_id == RIO_MPORT_ANY && port->nscan == scan_ops))
1746 list_for_each_entry(scan, &rio_scans, node) {
1747 if (scan->mport_id == mport_id) {
1748 list_del(&scan->node);
1754 mutex_unlock(&rio_mport_list_lock);
1758 EXPORT_SYMBOL_GPL(rio_unregister_scan);
1761 * rio_mport_scan - execute enumeration/discovery on the specified mport
1762 * @mport_id: number (ID) of mport device
1764 int rio_mport_scan(int mport_id)
1766 struct rio_mport *port = NULL;
1769 mutex_lock(&rio_mport_list_lock);
1770 list_for_each_entry(port, &rio_mports, node) {
1771 if (port->id == mport_id)
1774 mutex_unlock(&rio_mport_list_lock);
1778 mutex_unlock(&rio_mport_list_lock);
1782 if (!try_module_get(port->nscan->owner)) {
1783 mutex_unlock(&rio_mport_list_lock);
1787 mutex_unlock(&rio_mport_list_lock);
1789 if (port->host_deviceid >= 0)
1790 rc = port->nscan->enumerate(port, 0);
1792 rc = port->nscan->discover(port, RIO_SCAN_ENUM_NO_WAIT);
1794 module_put(port->nscan->owner);
1798 static void rio_fixup_device(struct rio_dev *dev)
1802 static int rio_init(void)
1804 struct rio_dev *dev = NULL;
1806 while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
1807 rio_fixup_device(dev);
1812 static struct workqueue_struct *rio_wq;
1814 struct rio_disc_work {
1815 struct work_struct work;
1816 struct rio_mport *mport;
1819 static void disc_work_handler(struct work_struct *_work)
1821 struct rio_disc_work *work;
1823 work = container_of(_work, struct rio_disc_work, work);
1824 pr_debug("RIO: discovery work for mport %d %s\n",
1825 work->mport->id, work->mport->name);
1826 if (try_module_get(work->mport->nscan->owner)) {
1827 work->mport->nscan->discover(work->mport, 0);
1828 module_put(work->mport->nscan->owner);
1832 int rio_init_mports(void)
1834 struct rio_mport *port;
1835 struct rio_disc_work *work;
1842 * First, run enumerations and check if we need to perform discovery
1843 * on any of the registered mports.
1845 mutex_lock(&rio_mport_list_lock);
1846 list_for_each_entry(port, &rio_mports, node) {
1847 if (port->host_deviceid >= 0) {
1848 if (port->nscan && try_module_get(port->nscan->owner)) {
1849 port->nscan->enumerate(port, 0);
1850 module_put(port->nscan->owner);
1855 mutex_unlock(&rio_mport_list_lock);
1861 * If we have mports that require discovery schedule a discovery work
1862 * for each of them. If the code below fails to allocate needed
1863 * resources, exit without error to keep results of enumeration
1865 * TODO: Implement restart of discovery process for all or
1866 * individual discovering mports.
1868 rio_wq = alloc_workqueue("riodisc", 0, 0);
1870 pr_err("RIO: unable allocate rio_wq\n");
1874 work = kcalloc(n, sizeof *work, GFP_KERNEL);
1876 pr_err("RIO: no memory for work struct\n");
1877 destroy_workqueue(rio_wq);
1882 mutex_lock(&rio_mport_list_lock);
1883 list_for_each_entry(port, &rio_mports, node) {
1884 if (port->host_deviceid < 0 && port->nscan) {
1885 work[n].mport = port;
1886 INIT_WORK(&work[n].work, disc_work_handler);
1887 queue_work(rio_wq, &work[n].work);
1892 flush_workqueue(rio_wq);
1893 mutex_unlock(&rio_mport_list_lock);
1894 pr_debug("RIO: destroy discovery workqueue\n");
1895 destroy_workqueue(rio_wq);
1904 static int rio_get_hdid(int index)
1906 if (ids_num == 0 || ids_num <= index || index >= RIO_MAX_MPORTS)
1912 int rio_register_mport(struct rio_mport *port)
1914 struct rio_scan_node *scan = NULL;
1917 if (next_portid >= RIO_MAX_MPORTS) {
1918 pr_err("RIO: reached specified max number of mports\n");
1922 port->id = next_portid++;
1923 port->host_deviceid = rio_get_hdid(port->id);
1926 dev_set_name(&port->dev, "rapidio%d", port->id);
1927 port->dev.class = &rio_mport_class;
1929 res = device_register(&port->dev);
1931 dev_err(&port->dev, "RIO: mport%d registration failed ERR=%d\n",
1934 dev_dbg(&port->dev, "RIO: mport%d registered\n", port->id);
1936 mutex_lock(&rio_mport_list_lock);
1937 list_add_tail(&port->node, &rio_mports);
1940 * Check if there are any registered enumeration/discovery operations
1941 * that have to be attached to the added mport.
1943 list_for_each_entry(scan, &rio_scans, node) {
1944 if (port->id == scan->mport_id ||
1945 scan->mport_id == RIO_MPORT_ANY) {
1946 port->nscan = scan->ops;
1947 if (port->id == scan->mport_id)
1951 mutex_unlock(&rio_mport_list_lock);
1953 pr_debug("RIO: %s %s id=%d\n", __func__, port->name, port->id);
1956 EXPORT_SYMBOL_GPL(rio_register_mport);
1958 EXPORT_SYMBOL_GPL(rio_local_get_device_id);
1959 EXPORT_SYMBOL_GPL(rio_get_device);
1960 EXPORT_SYMBOL_GPL(rio_get_asm);
1961 EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
1962 EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
1963 EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
1964 EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
1965 EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
1966 EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
1967 EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
1968 EXPORT_SYMBOL_GPL(rio_release_outb_mbox);
1969 EXPORT_SYMBOL_GPL(rio_init_mports);