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_query_mport - Query mport device attributes
72 * @port: mport device to query
73 * @mport_attr: mport attributes data structure
75 * Returns attributes of specified mport through the
76 * pointer to attributes data structure.
78 int rio_query_mport(struct rio_mport *port,
79 struct rio_mport_attr *mport_attr)
81 if (!port->ops->query_mport)
83 return port->ops->query_mport(port, mport_attr);
85 EXPORT_SYMBOL(rio_query_mport);
88 * rio_add_device- Adds a RIO device to the device model
91 * Adds the RIO device to the global device list and adds the RIO
92 * device to the RIO device list. Creates the generic sysfs nodes
95 int rio_add_device(struct rio_dev *rdev)
99 err = device_add(&rdev->dev);
103 spin_lock(&rio_global_list_lock);
104 list_add_tail(&rdev->global_list, &rio_devices);
105 spin_unlock(&rio_global_list_lock);
107 rio_create_sysfs_dev_files(rdev);
111 EXPORT_SYMBOL_GPL(rio_add_device);
114 * rio_request_inb_mbox - request inbound mailbox service
115 * @mport: RIO master port from which to allocate the mailbox resource
116 * @dev_id: Device specific pointer to pass on event
117 * @mbox: Mailbox number to claim
118 * @entries: Number of entries in inbound mailbox queue
119 * @minb: Callback to execute when inbound message is received
121 * Requests ownership of an inbound mailbox resource and binds
122 * a callback function to the resource. Returns %0 on success.
124 int rio_request_inb_mbox(struct rio_mport *mport,
128 void (*minb) (struct rio_mport * mport, void *dev_id, int mbox,
132 struct resource *res;
134 if (mport->ops->open_inb_mbox == NULL)
137 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
140 rio_init_mbox_res(res, mbox, mbox);
142 /* Make sure this mailbox isn't in use */
144 request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],
150 mport->inb_msg[mbox].res = res;
152 /* Hook the inbound message callback */
153 mport->inb_msg[mbox].mcback = minb;
155 rc = mport->ops->open_inb_mbox(mport, dev_id, mbox, entries);
164 * rio_release_inb_mbox - release inbound mailbox message service
165 * @mport: RIO master port from which to release the mailbox resource
166 * @mbox: Mailbox number to release
168 * Releases ownership of an inbound mailbox resource. Returns 0
169 * if the request has been satisfied.
171 int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
173 if (mport->ops->close_inb_mbox) {
174 mport->ops->close_inb_mbox(mport, mbox);
176 /* Release the mailbox resource */
177 return release_resource(mport->inb_msg[mbox].res);
183 * rio_request_outb_mbox - request outbound mailbox service
184 * @mport: RIO master port from which to allocate the mailbox resource
185 * @dev_id: Device specific pointer to pass on event
186 * @mbox: Mailbox number to claim
187 * @entries: Number of entries in outbound mailbox queue
188 * @moutb: Callback to execute when outbound message is sent
190 * Requests ownership of an outbound mailbox resource and binds
191 * a callback function to the resource. Returns 0 on success.
193 int rio_request_outb_mbox(struct rio_mport *mport,
197 void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot))
200 struct resource *res;
202 if (mport->ops->open_outb_mbox == NULL)
205 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
208 rio_init_mbox_res(res, mbox, mbox);
210 /* Make sure this outbound mailbox isn't in use */
212 request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],
218 mport->outb_msg[mbox].res = res;
220 /* Hook the inbound message callback */
221 mport->outb_msg[mbox].mcback = moutb;
223 rc = mport->ops->open_outb_mbox(mport, dev_id, mbox, entries);
232 * rio_release_outb_mbox - release outbound mailbox message service
233 * @mport: RIO master port from which to release the mailbox resource
234 * @mbox: Mailbox number to release
236 * Releases ownership of an inbound mailbox resource. Returns 0
237 * if the request has been satisfied.
239 int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
241 if (mport->ops->close_outb_mbox) {
242 mport->ops->close_outb_mbox(mport, mbox);
244 /* Release the mailbox resource */
245 return release_resource(mport->outb_msg[mbox].res);
251 * rio_setup_inb_dbell - bind inbound doorbell callback
252 * @mport: RIO master port to bind the doorbell callback
253 * @dev_id: Device specific pointer to pass on event
254 * @res: Doorbell message resource
255 * @dinb: Callback to execute when doorbell is received
257 * Adds a doorbell resource/callback pair into a port's
258 * doorbell event list. Returns 0 if the request has been
262 rio_setup_inb_dbell(struct rio_mport *mport, void *dev_id, struct resource *res,
263 void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, u16 dst,
267 struct rio_dbell *dbell;
269 if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
276 dbell->dev_id = dev_id;
278 list_add_tail(&dbell->node, &mport->dbells);
285 * rio_request_inb_dbell - request inbound doorbell message service
286 * @mport: RIO master port from which to allocate the doorbell resource
287 * @dev_id: Device specific pointer to pass on event
288 * @start: Doorbell info range start
289 * @end: Doorbell info range end
290 * @dinb: Callback to execute when doorbell is received
292 * Requests ownership of an inbound doorbell resource and binds
293 * a callback function to the resource. Returns 0 if the request
294 * has been satisfied.
296 int rio_request_inb_dbell(struct rio_mport *mport,
300 void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src,
305 struct resource *res = kzalloc(sizeof(struct resource), GFP_KERNEL);
308 rio_init_dbell_res(res, start, end);
310 /* Make sure these doorbells aren't in use */
312 request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],
318 /* Hook the doorbell callback */
319 rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);
328 * rio_release_inb_dbell - release inbound doorbell message service
329 * @mport: RIO master port from which to release the doorbell resource
330 * @start: Doorbell info range start
331 * @end: Doorbell info range end
333 * Releases ownership of an inbound doorbell resource and removes
334 * callback from the doorbell event list. Returns 0 if the request
335 * has been satisfied.
337 int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
339 int rc = 0, found = 0;
340 struct rio_dbell *dbell;
342 list_for_each_entry(dbell, &mport->dbells, node) {
343 if ((dbell->res->start == start) && (dbell->res->end == end)) {
349 /* If we can't find an exact match, fail */
355 /* Delete from list */
356 list_del(&dbell->node);
358 /* Release the doorbell resource */
359 rc = release_resource(dbell->res);
361 /* Free the doorbell event */
369 * rio_request_outb_dbell - request outbound doorbell message range
370 * @rdev: RIO device from which to allocate the doorbell resource
371 * @start: Doorbell message range start
372 * @end: Doorbell message range end
374 * Requests ownership of a doorbell message range. Returns a resource
375 * if the request has been satisfied or %NULL on failure.
377 struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start,
380 struct resource *res = kzalloc(sizeof(struct resource), GFP_KERNEL);
383 rio_init_dbell_res(res, start, end);
385 /* Make sure these doorbells aren't in use */
386 if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)
397 * rio_release_outb_dbell - release outbound doorbell message range
398 * @rdev: RIO device from which to release the doorbell resource
399 * @res: Doorbell resource to be freed
401 * Releases ownership of a doorbell message range. Returns 0 if the
402 * request has been satisfied.
404 int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res)
406 int rc = release_resource(res);
414 * rio_request_inb_pwrite - request inbound port-write message service
415 * @rdev: RIO device to which register inbound port-write callback routine
416 * @pwcback: Callback routine to execute when port-write is received
418 * Binds a port-write callback function to the RapidIO device.
419 * Returns 0 if the request has been satisfied.
421 int rio_request_inb_pwrite(struct rio_dev *rdev,
422 int (*pwcback)(struct rio_dev *rdev, union rio_pw_msg *msg, int step))
426 spin_lock(&rio_global_list_lock);
427 if (rdev->pwcback != NULL)
430 rdev->pwcback = pwcback;
432 spin_unlock(&rio_global_list_lock);
435 EXPORT_SYMBOL_GPL(rio_request_inb_pwrite);
438 * rio_release_inb_pwrite - release inbound port-write message service
439 * @rdev: RIO device which registered for inbound port-write callback
441 * Removes callback from the rio_dev structure. Returns 0 if the request
442 * has been satisfied.
444 int rio_release_inb_pwrite(struct rio_dev *rdev)
448 spin_lock(&rio_global_list_lock);
450 rdev->pwcback = NULL;
454 spin_unlock(&rio_global_list_lock);
457 EXPORT_SYMBOL_GPL(rio_release_inb_pwrite);
460 * rio_map_inb_region -- Map inbound memory region.
461 * @mport: Master port.
462 * @local: physical address of memory region to be mapped
463 * @rbase: RIO base address assigned to this window
464 * @size: Size of the memory region
465 * @rflags: Flags for mapping.
467 * Return: 0 -- Success.
469 * This function will create the mapping from RIO space to local memory.
471 int rio_map_inb_region(struct rio_mport *mport, dma_addr_t local,
472 u64 rbase, u32 size, u32 rflags)
477 if (!mport->ops->map_inb)
479 spin_lock_irqsave(&rio_mmap_lock, flags);
480 rc = mport->ops->map_inb(mport, local, rbase, size, rflags);
481 spin_unlock_irqrestore(&rio_mmap_lock, flags);
484 EXPORT_SYMBOL_GPL(rio_map_inb_region);
487 * rio_unmap_inb_region -- Unmap the inbound memory region
488 * @mport: Master port
489 * @lstart: physical address of memory region to be unmapped
491 void rio_unmap_inb_region(struct rio_mport *mport, dma_addr_t lstart)
494 if (!mport->ops->unmap_inb)
496 spin_lock_irqsave(&rio_mmap_lock, flags);
497 mport->ops->unmap_inb(mport, lstart);
498 spin_unlock_irqrestore(&rio_mmap_lock, flags);
500 EXPORT_SYMBOL_GPL(rio_unmap_inb_region);
503 * rio_mport_get_physefb - Helper function that returns register offset
504 * for Physical Layer Extended Features Block.
505 * @port: Master port to issue transaction
506 * @local: Indicate a local master port or remote device access
507 * @destid: Destination ID of the device
508 * @hopcount: Number of switch hops to the device
511 rio_mport_get_physefb(struct rio_mport *port, int local,
512 u16 destid, u8 hopcount)
517 ext_ftr_ptr = rio_mport_get_efb(port, local, destid, hopcount, 0);
519 while (ext_ftr_ptr) {
521 rio_local_read_config_32(port, ext_ftr_ptr,
524 rio_mport_read_config_32(port, destid, hopcount,
525 ext_ftr_ptr, &ftr_header);
527 ftr_header = RIO_GET_BLOCK_ID(ftr_header);
528 switch (ftr_header) {
530 case RIO_EFB_SER_EP_ID_V13P:
531 case RIO_EFB_SER_EP_REC_ID_V13P:
532 case RIO_EFB_SER_EP_FREE_ID_V13P:
533 case RIO_EFB_SER_EP_ID:
534 case RIO_EFB_SER_EP_REC_ID:
535 case RIO_EFB_SER_EP_FREE_ID:
536 case RIO_EFB_SER_EP_FREC_ID:
544 ext_ftr_ptr = rio_mport_get_efb(port, local, destid,
545 hopcount, ext_ftr_ptr);
550 EXPORT_SYMBOL_GPL(rio_mport_get_physefb);
553 * rio_get_comptag - Begin or continue searching for a RIO device by component tag
554 * @comp_tag: RIO component tag to match
555 * @from: Previous RIO device found in search, or %NULL for new search
557 * Iterates through the list of known RIO devices. If a RIO device is
558 * found with a matching @comp_tag, a pointer to its device
559 * structure is returned. Otherwise, %NULL is returned. A new search
560 * is initiated by passing %NULL to the @from argument. Otherwise, if
561 * @from is not %NULL, searches continue from next device on the global
564 struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from)
567 struct rio_dev *rdev;
569 spin_lock(&rio_global_list_lock);
570 n = from ? from->global_list.next : rio_devices.next;
572 while (n && (n != &rio_devices)) {
574 if (rdev->comp_tag == comp_tag)
580 spin_unlock(&rio_global_list_lock);
583 EXPORT_SYMBOL_GPL(rio_get_comptag);
586 * rio_set_port_lockout - Sets/clears LOCKOUT bit (RIO EM 1.3) for a switch port.
587 * @rdev: Pointer to RIO device control structure
588 * @pnum: Switch port number to set LOCKOUT bit
589 * @lock: Operation : set (=1) or clear (=0)
591 int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock)
595 rio_read_config_32(rdev,
596 rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
599 regval |= RIO_PORT_N_CTL_LOCKOUT;
601 regval &= ~RIO_PORT_N_CTL_LOCKOUT;
603 rio_write_config_32(rdev,
604 rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
608 EXPORT_SYMBOL_GPL(rio_set_port_lockout);
611 * rio_enable_rx_tx_port - enable input receiver and output transmitter of
613 * @port: Master port associated with the RIO network
614 * @local: local=1 select local port otherwise a far device is reached
615 * @destid: Destination ID of the device to check host bit
616 * @hopcount: Number of hops to reach the target
617 * @port_num: Port (-number on switch) to enable on a far end device
619 * Returns 0 or 1 from on General Control Command and Status Register
622 int rio_enable_rx_tx_port(struct rio_mport *port,
623 int local, u16 destid,
624 u8 hopcount, u8 port_num)
626 #ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
631 * enable rx input tx output port
633 pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
634 "%d, port_num = %d)\n", local, destid, hopcount, port_num);
636 ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
639 rio_local_read_config_32(port, ext_ftr_ptr +
640 RIO_PORT_N_CTL_CSR(0),
643 if (rio_mport_read_config_32(port, destid, hopcount,
644 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), ®val) < 0)
648 if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
650 regval = regval | RIO_PORT_N_CTL_EN_RX_SER
651 | RIO_PORT_N_CTL_EN_TX_SER;
654 regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
655 | RIO_PORT_N_CTL_EN_TX_PAR;
659 rio_local_write_config_32(port, ext_ftr_ptr +
660 RIO_PORT_N_CTL_CSR(0), regval);
662 if (rio_mport_write_config_32(port, destid, hopcount,
663 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
669 EXPORT_SYMBOL_GPL(rio_enable_rx_tx_port);
673 * rio_chk_dev_route - Validate route to the specified device.
674 * @rdev: RIO device failed to respond
675 * @nrdev: Last active device on the route to rdev
676 * @npnum: nrdev's port number on the route to rdev
678 * Follows a route to the specified RIO device to determine the last available
679 * device (and corresponding RIO port) on the route.
682 rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum)
685 int p_port, rc = -EIO;
686 struct rio_dev *prev = NULL;
688 /* Find switch with failed RIO link */
689 while (rdev->prev && (rdev->prev->pef & RIO_PEF_SWITCH)) {
690 if (!rio_read_config_32(rdev->prev, RIO_DEV_ID_CAR, &result)) {
700 p_port = prev->rswitch->route_table[rdev->destid];
702 if (p_port != RIO_INVALID_ROUTE) {
703 pr_debug("RIO: link failed on [%s]-P%d\n",
704 rio_name(prev), p_port);
709 pr_debug("RIO: failed to trace route to %s\n", rio_name(rdev));
715 * rio_mport_chk_dev_access - Validate access to the specified device.
716 * @mport: Master port to send transactions
717 * @destid: Device destination ID in network
718 * @hopcount: Number of hops into the network
721 rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount)
726 while (rio_mport_read_config_32(mport, destid, hopcount,
727 RIO_DEV_ID_CAR, &tmp)) {
729 if (i == RIO_MAX_CHK_RETRY)
736 EXPORT_SYMBOL_GPL(rio_mport_chk_dev_access);
739 * rio_chk_dev_access - Validate access to the specified device.
740 * @rdev: Pointer to RIO device control structure
742 static int rio_chk_dev_access(struct rio_dev *rdev)
744 return rio_mport_chk_dev_access(rdev->net->hport,
745 rdev->destid, rdev->hopcount);
749 * rio_get_input_status - Sends a Link-Request/Input-Status control symbol and
750 * returns link-response (if requested).
751 * @rdev: RIO devive to issue Input-status command
752 * @pnum: Device port number to issue the command
753 * @lnkresp: Response from a link partner
756 rio_get_input_status(struct rio_dev *rdev, int pnum, u32 *lnkresp)
762 /* Read from link maintenance response register
763 * to clear valid bit */
764 rio_read_config_32(rdev,
765 rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
770 /* Issue Input-status command */
771 rio_write_config_32(rdev,
772 rdev->phys_efptr + RIO_PORT_N_MNT_REQ_CSR(pnum),
775 /* Exit if the response is not expected */
780 while (checkcount--) {
782 rio_read_config_32(rdev,
783 rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
785 if (regval & RIO_PORT_N_MNT_RSP_RVAL) {
795 * rio_clr_err_stopped - Clears port Error-stopped states.
796 * @rdev: Pointer to RIO device control structure
797 * @pnum: Switch port number to clear errors
798 * @err_status: port error status (if 0 reads register from device)
800 static int rio_clr_err_stopped(struct rio_dev *rdev, u32 pnum, u32 err_status)
802 struct rio_dev *nextdev = rdev->rswitch->nextdev[pnum];
804 u32 far_ackid, far_linkstat, near_ackid;
807 rio_read_config_32(rdev,
808 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
811 if (err_status & RIO_PORT_N_ERR_STS_PW_OUT_ES) {
812 pr_debug("RIO_EM: servicing Output Error-Stopped state\n");
814 * Send a Link-Request/Input-Status control symbol
816 if (rio_get_input_status(rdev, pnum, ®val)) {
817 pr_debug("RIO_EM: Input-status response timeout\n");
821 pr_debug("RIO_EM: SP%d Input-status response=0x%08x\n",
823 far_ackid = (regval & RIO_PORT_N_MNT_RSP_ASTAT) >> 5;
824 far_linkstat = regval & RIO_PORT_N_MNT_RSP_LSTAT;
825 rio_read_config_32(rdev,
826 rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
828 pr_debug("RIO_EM: SP%d_ACK_STS_CSR=0x%08x\n", pnum, regval);
829 near_ackid = (regval & RIO_PORT_N_ACK_INBOUND) >> 24;
830 pr_debug("RIO_EM: SP%d far_ackID=0x%02x far_linkstat=0x%02x" \
831 " near_ackID=0x%02x\n",
832 pnum, far_ackid, far_linkstat, near_ackid);
835 * If required, synchronize ackIDs of near and
838 if ((far_ackid != ((regval & RIO_PORT_N_ACK_OUTSTAND) >> 8)) ||
839 (far_ackid != (regval & RIO_PORT_N_ACK_OUTBOUND))) {
840 /* Align near outstanding/outbound ackIDs with
843 rio_write_config_32(rdev,
844 rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
846 (far_ackid << 8) | far_ackid);
847 /* Align far outstanding/outbound ackIDs with
852 rio_write_config_32(nextdev,
853 nextdev->phys_efptr +
854 RIO_PORT_N_ACK_STS_CSR(RIO_GET_PORT_NUM(nextdev->swpinfo)),
856 (near_ackid << 8) | near_ackid);
858 pr_debug("RIO_EM: Invalid nextdev pointer (NULL)\n");
861 rio_read_config_32(rdev,
862 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
864 pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
867 if ((err_status & RIO_PORT_N_ERR_STS_PW_INP_ES) && nextdev) {
868 pr_debug("RIO_EM: servicing Input Error-Stopped state\n");
869 rio_get_input_status(nextdev,
870 RIO_GET_PORT_NUM(nextdev->swpinfo), NULL);
873 rio_read_config_32(rdev,
874 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
876 pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
879 return (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
880 RIO_PORT_N_ERR_STS_PW_INP_ES)) ? 1 : 0;
884 * rio_inb_pwrite_handler - process inbound port-write message
885 * @pw_msg: pointer to inbound port-write message
887 * Processes an inbound port-write message. Returns 0 if the request
888 * has been satisfied.
890 int rio_inb_pwrite_handler(union rio_pw_msg *pw_msg)
892 struct rio_dev *rdev;
893 u32 err_status, em_perrdet, em_ltlerrdet;
896 rdev = rio_get_comptag((pw_msg->em.comptag & RIO_CTAG_UDEVID), NULL);
898 /* Device removed or enumeration error */
899 pr_debug("RIO: %s No matching device for CTag 0x%08x\n",
900 __func__, pw_msg->em.comptag);
904 pr_debug("RIO: Port-Write message from %s\n", rio_name(rdev));
909 for (i = 0; i < RIO_PW_MSG_SIZE/sizeof(u32);) {
910 pr_debug("0x%02x: %08x %08x %08x %08x\n",
911 i*4, pw_msg->raw[i], pw_msg->raw[i + 1],
912 pw_msg->raw[i + 2], pw_msg->raw[i + 3]);
918 /* Call an external service function (if such is registered
919 * for this device). This may be the service for endpoints that send
920 * device-specific port-write messages. End-point messages expected
921 * to be handled completely by EP specific device driver.
922 * For switches rc==0 signals that no standard processing required.
924 if (rdev->pwcback != NULL) {
925 rc = rdev->pwcback(rdev, pw_msg, 0);
930 portnum = pw_msg->em.is_port & 0xFF;
932 /* Check if device and route to it are functional:
933 * Sometimes devices may send PW message(s) just before being
934 * powered down (or link being lost).
936 if (rio_chk_dev_access(rdev)) {
937 pr_debug("RIO: device access failed - get link partner\n");
938 /* Scan route to the device and identify failed link.
939 * This will replace device and port reported in PW message.
940 * PW message should not be used after this point.
942 if (rio_chk_dev_route(rdev, &rdev, &portnum)) {
943 pr_err("RIO: Route trace for %s failed\n",
950 /* For End-point devices processing stops here */
951 if (!(rdev->pef & RIO_PEF_SWITCH))
954 if (rdev->phys_efptr == 0) {
955 pr_err("RIO_PW: Bad switch initialization for %s\n",
961 * Process the port-write notification from switch
963 if (rdev->rswitch->ops && rdev->rswitch->ops->em_handle)
964 rdev->rswitch->ops->em_handle(rdev, portnum);
966 rio_read_config_32(rdev,
967 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
969 pr_debug("RIO_PW: SP%d_ERR_STS_CSR=0x%08x\n", portnum, err_status);
971 if (err_status & RIO_PORT_N_ERR_STS_PORT_OK) {
973 if (!(rdev->rswitch->port_ok & (1 << portnum))) {
974 rdev->rswitch->port_ok |= (1 << portnum);
975 rio_set_port_lockout(rdev, portnum, 0);
976 /* Schedule Insertion Service */
977 pr_debug("RIO_PW: Device Insertion on [%s]-P%d\n",
978 rio_name(rdev), portnum);
981 /* Clear error-stopped states (if reported).
982 * Depending on the link partner state, two attempts
983 * may be needed for successful recovery.
985 if (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
986 RIO_PORT_N_ERR_STS_PW_INP_ES)) {
987 if (rio_clr_err_stopped(rdev, portnum, err_status))
988 rio_clr_err_stopped(rdev, portnum, 0);
990 } else { /* if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT) */
992 if (rdev->rswitch->port_ok & (1 << portnum)) {
993 rdev->rswitch->port_ok &= ~(1 << portnum);
994 rio_set_port_lockout(rdev, portnum, 1);
996 rio_write_config_32(rdev,
998 RIO_PORT_N_ACK_STS_CSR(portnum),
999 RIO_PORT_N_ACK_CLEAR);
1001 /* Schedule Extraction Service */
1002 pr_debug("RIO_PW: Device Extraction on [%s]-P%d\n",
1003 rio_name(rdev), portnum);
1007 rio_read_config_32(rdev,
1008 rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), &em_perrdet);
1010 pr_debug("RIO_PW: RIO_EM_P%d_ERR_DETECT=0x%08x\n",
1011 portnum, em_perrdet);
1012 /* Clear EM Port N Error Detect CSR */
1013 rio_write_config_32(rdev,
1014 rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), 0);
1017 rio_read_config_32(rdev,
1018 rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, &em_ltlerrdet);
1020 pr_debug("RIO_PW: RIO_EM_LTL_ERR_DETECT=0x%08x\n",
1022 /* Clear EM L/T Layer Error Detect CSR */
1023 rio_write_config_32(rdev,
1024 rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, 0);
1027 /* Clear remaining error bits and Port-Write Pending bit */
1028 rio_write_config_32(rdev,
1029 rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
1034 EXPORT_SYMBOL_GPL(rio_inb_pwrite_handler);
1037 * rio_mport_get_efb - get pointer to next extended features block
1038 * @port: Master port to issue transaction
1039 * @local: Indicate a local master port or remote device access
1040 * @destid: Destination ID of the device
1041 * @hopcount: Number of switch hops to the device
1042 * @from: Offset of current Extended Feature block header (if 0 starts
1043 * from ExtFeaturePtr)
1046 rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,
1047 u8 hopcount, u32 from)
1053 rio_local_read_config_32(port, RIO_ASM_INFO_CAR,
1056 rio_mport_read_config_32(port, destid, hopcount,
1057 RIO_ASM_INFO_CAR, ®_val);
1058 return reg_val & RIO_EXT_FTR_PTR_MASK;
1061 rio_local_read_config_32(port, from, ®_val);
1063 rio_mport_read_config_32(port, destid, hopcount,
1065 return RIO_GET_BLOCK_ID(reg_val);
1068 EXPORT_SYMBOL_GPL(rio_mport_get_efb);
1071 * rio_mport_get_feature - query for devices' extended features
1072 * @port: Master port to issue transaction
1073 * @local: Indicate a local master port or remote device access
1074 * @destid: Destination ID of the device
1075 * @hopcount: Number of switch hops to the device
1076 * @ftr: Extended feature code
1078 * Tell if a device supports a given RapidIO capability.
1079 * Returns the offset of the requested extended feature
1080 * block within the device's RIO configuration space or
1081 * 0 in case the device does not support it. Possible
1084 * %RIO_EFB_PAR_EP_ID LP/LVDS EP Devices
1086 * %RIO_EFB_PAR_EP_REC_ID LP/LVDS EP Recovery Devices
1088 * %RIO_EFB_PAR_EP_FREE_ID LP/LVDS EP Free Devices
1090 * %RIO_EFB_SER_EP_ID LP/Serial EP Devices
1092 * %RIO_EFB_SER_EP_REC_ID LP/Serial EP Recovery Devices
1094 * %RIO_EFB_SER_EP_FREE_ID LP/Serial EP Free Devices
1097 rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
1098 u8 hopcount, int ftr)
1100 u32 asm_info, ext_ftr_ptr, ftr_header;
1103 rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);
1105 rio_mport_read_config_32(port, destid, hopcount,
1106 RIO_ASM_INFO_CAR, &asm_info);
1108 ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;
1110 while (ext_ftr_ptr) {
1112 rio_local_read_config_32(port, ext_ftr_ptr,
1115 rio_mport_read_config_32(port, destid, hopcount,
1116 ext_ftr_ptr, &ftr_header);
1117 if (RIO_GET_BLOCK_ID(ftr_header) == ftr)
1119 if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header)))
1125 EXPORT_SYMBOL_GPL(rio_mport_get_feature);
1128 * rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
1129 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
1130 * @did: RIO did to match or %RIO_ANY_ID to match all dids
1131 * @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids
1132 * @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids
1133 * @from: Previous RIO device found in search, or %NULL for new search
1135 * Iterates through the list of known RIO devices. If a RIO device is
1136 * found with a matching @vid, @did, @asm_vid, @asm_did, the reference
1137 * count to the device is incrememted and a pointer to its device
1138 * structure is returned. Otherwise, %NULL is returned. A new search
1139 * is initiated by passing %NULL to the @from argument. Otherwise, if
1140 * @from is not %NULL, searches continue from next device on the global
1141 * list. The reference count for @from is always decremented if it is
1144 struct rio_dev *rio_get_asm(u16 vid, u16 did,
1145 u16 asm_vid, u16 asm_did, struct rio_dev *from)
1147 struct list_head *n;
1148 struct rio_dev *rdev;
1150 WARN_ON(in_interrupt());
1151 spin_lock(&rio_global_list_lock);
1152 n = from ? from->global_list.next : rio_devices.next;
1154 while (n && (n != &rio_devices)) {
1155 rdev = rio_dev_g(n);
1156 if ((vid == RIO_ANY_ID || rdev->vid == vid) &&
1157 (did == RIO_ANY_ID || rdev->did == did) &&
1158 (asm_vid == RIO_ANY_ID || rdev->asm_vid == asm_vid) &&
1159 (asm_did == RIO_ANY_ID || rdev->asm_did == asm_did))
1166 rdev = rio_dev_get(rdev);
1167 spin_unlock(&rio_global_list_lock);
1172 * rio_get_device - Begin or continue searching for a RIO device by vid/did
1173 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
1174 * @did: RIO did to match or %RIO_ANY_ID to match all dids
1175 * @from: Previous RIO device found in search, or %NULL for new search
1177 * Iterates through the list of known RIO devices. If a RIO device is
1178 * found with a matching @vid and @did, the reference count to the
1179 * device is incrememted and a pointer to its device structure is returned.
1180 * Otherwise, %NULL is returned. A new search is initiated by passing %NULL
1181 * to the @from argument. Otherwise, if @from is not %NULL, searches
1182 * continue from next device on the global list. The reference count for
1183 * @from is always decremented if it is not %NULL.
1185 struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from)
1187 return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
1191 * rio_std_route_add_entry - Add switch route table entry using standard
1192 * registers defined in RIO specification rev.1.3
1193 * @mport: Master port to issue transaction
1194 * @destid: Destination ID of the device
1195 * @hopcount: Number of switch hops to the device
1196 * @table: routing table ID (global or port-specific)
1197 * @route_destid: destID entry in the RT
1198 * @route_port: destination port for specified destID
1201 rio_std_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1202 u16 table, u16 route_destid, u8 route_port)
1204 if (table == RIO_GLOBAL_TABLE) {
1205 rio_mport_write_config_32(mport, destid, hopcount,
1206 RIO_STD_RTE_CONF_DESTID_SEL_CSR,
1208 rio_mport_write_config_32(mport, destid, hopcount,
1209 RIO_STD_RTE_CONF_PORT_SEL_CSR,
1218 * rio_std_route_get_entry - Read switch route table entry (port number)
1219 * associated with specified destID using standard registers defined in RIO
1220 * specification rev.1.3
1221 * @mport: Master port to issue transaction
1222 * @destid: Destination ID of the device
1223 * @hopcount: Number of switch hops to the device
1224 * @table: routing table ID (global or port-specific)
1225 * @route_destid: destID entry in the RT
1226 * @route_port: returned destination port for specified destID
1229 rio_std_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1230 u16 table, u16 route_destid, u8 *route_port)
1234 if (table == RIO_GLOBAL_TABLE) {
1235 rio_mport_write_config_32(mport, destid, hopcount,
1236 RIO_STD_RTE_CONF_DESTID_SEL_CSR, route_destid);
1237 rio_mport_read_config_32(mport, destid, hopcount,
1238 RIO_STD_RTE_CONF_PORT_SEL_CSR, &result);
1240 *route_port = (u8)result;
1247 * rio_std_route_clr_table - Clear swotch route table using standard registers
1248 * defined in RIO specification rev.1.3.
1249 * @mport: Master port to issue transaction
1250 * @destid: Destination ID of the device
1251 * @hopcount: Number of switch hops to the device
1252 * @table: routing table ID (global or port-specific)
1255 rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
1258 u32 max_destid = 0xff;
1259 u32 i, pef, id_inc = 1, ext_cfg = 0;
1260 u32 port_sel = RIO_INVALID_ROUTE;
1262 if (table == RIO_GLOBAL_TABLE) {
1263 rio_mport_read_config_32(mport, destid, hopcount,
1266 if (mport->sys_size) {
1267 rio_mport_read_config_32(mport, destid, hopcount,
1268 RIO_SWITCH_RT_LIMIT,
1270 max_destid &= RIO_RT_MAX_DESTID;
1273 if (pef & RIO_PEF_EXT_RT) {
1274 ext_cfg = 0x80000000;
1276 port_sel = (RIO_INVALID_ROUTE << 24) |
1277 (RIO_INVALID_ROUTE << 16) |
1278 (RIO_INVALID_ROUTE << 8) |
1282 for (i = 0; i <= max_destid;) {
1283 rio_mport_write_config_32(mport, destid, hopcount,
1284 RIO_STD_RTE_CONF_DESTID_SEL_CSR,
1286 rio_mport_write_config_32(mport, destid, hopcount,
1287 RIO_STD_RTE_CONF_PORT_SEL_CSR,
1298 * rio_lock_device - Acquires host device lock for specified device
1299 * @port: Master port to send transaction
1300 * @destid: Destination ID for device/switch
1301 * @hopcount: Hopcount to reach switch
1302 * @wait_ms: Max wait time in msec (0 = no timeout)
1304 * Attepts to acquire host device lock for specified device
1305 * Returns 0 if device lock acquired or EINVAL if timeout expires.
1307 int rio_lock_device(struct rio_mport *port, u16 destid,
1308 u8 hopcount, int wait_ms)
1313 /* Attempt to acquire device lock */
1314 rio_mport_write_config_32(port, destid, hopcount,
1315 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
1316 rio_mport_read_config_32(port, destid, hopcount,
1317 RIO_HOST_DID_LOCK_CSR, &result);
1319 while (result != port->host_deviceid) {
1320 if (wait_ms != 0 && tcnt == wait_ms) {
1321 pr_debug("RIO: timeout when locking device %x:%x\n",
1329 /* Try to acquire device lock again */
1330 rio_mport_write_config_32(port, destid,
1332 RIO_HOST_DID_LOCK_CSR,
1333 port->host_deviceid);
1334 rio_mport_read_config_32(port, destid,
1336 RIO_HOST_DID_LOCK_CSR, &result);
1341 EXPORT_SYMBOL_GPL(rio_lock_device);
1344 * rio_unlock_device - Releases host device lock for specified device
1345 * @port: Master port to send transaction
1346 * @destid: Destination ID for device/switch
1347 * @hopcount: Hopcount to reach switch
1349 * Returns 0 if device lock released or EINVAL if fails.
1351 int rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
1355 /* Release device lock */
1356 rio_mport_write_config_32(port, destid,
1358 RIO_HOST_DID_LOCK_CSR,
1359 port->host_deviceid);
1360 rio_mport_read_config_32(port, destid, hopcount,
1361 RIO_HOST_DID_LOCK_CSR, &result);
1362 if ((result & 0xffff) != 0xffff) {
1363 pr_debug("RIO: badness when releasing device lock %x:%x\n",
1370 EXPORT_SYMBOL_GPL(rio_unlock_device);
1373 * rio_route_add_entry- Add a route entry to a switch routing table
1375 * @table: Routing table ID
1376 * @route_destid: Destination ID to be routed
1377 * @route_port: Port number to be routed
1378 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
1380 * If available calls the switch specific add_entry() method to add a route
1381 * entry into a switch routing table. Otherwise uses standard RT update method
1382 * as defined by RapidIO specification. A specific routing table can be selected
1383 * using the @table argument if a switch has per port routing tables or
1384 * the standard (or global) table may be used by passing
1385 * %RIO_GLOBAL_TABLE in @table.
1387 * Returns %0 on success or %-EINVAL on failure.
1389 int rio_route_add_entry(struct rio_dev *rdev,
1390 u16 table, u16 route_destid, u8 route_port, int lock)
1393 struct rio_switch_ops *ops = rdev->rswitch->ops;
1396 rc = rio_lock_device(rdev->net->hport, rdev->destid,
1397 rdev->hopcount, 1000);
1402 spin_lock(&rdev->rswitch->lock);
1404 if (ops == NULL || ops->add_entry == NULL) {
1405 rc = rio_std_route_add_entry(rdev->net->hport, rdev->destid,
1406 rdev->hopcount, table,
1407 route_destid, route_port);
1408 } else if (try_module_get(ops->owner)) {
1409 rc = ops->add_entry(rdev->net->hport, rdev->destid,
1410 rdev->hopcount, table, route_destid,
1412 module_put(ops->owner);
1415 spin_unlock(&rdev->rswitch->lock);
1418 rio_unlock_device(rdev->net->hport, rdev->destid,
1423 EXPORT_SYMBOL_GPL(rio_route_add_entry);
1426 * rio_route_get_entry- Read an entry from a switch routing table
1428 * @table: Routing table ID
1429 * @route_destid: Destination ID to be routed
1430 * @route_port: Pointer to read port number into
1431 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
1433 * If available calls the switch specific get_entry() method to fetch a route
1434 * entry from a switch routing table. Otherwise uses standard RT read method
1435 * as defined by RapidIO specification. A specific routing table can be selected
1436 * using the @table argument if a switch has per port routing tables or
1437 * the standard (or global) table may be used by passing
1438 * %RIO_GLOBAL_TABLE in @table.
1440 * Returns %0 on success or %-EINVAL on failure.
1442 int rio_route_get_entry(struct rio_dev *rdev, u16 table,
1443 u16 route_destid, u8 *route_port, int lock)
1446 struct rio_switch_ops *ops = rdev->rswitch->ops;
1449 rc = rio_lock_device(rdev->net->hport, rdev->destid,
1450 rdev->hopcount, 1000);
1455 spin_lock(&rdev->rswitch->lock);
1457 if (ops == NULL || ops->get_entry == NULL) {
1458 rc = rio_std_route_get_entry(rdev->net->hport, rdev->destid,
1459 rdev->hopcount, table,
1460 route_destid, route_port);
1461 } else if (try_module_get(ops->owner)) {
1462 rc = ops->get_entry(rdev->net->hport, rdev->destid,
1463 rdev->hopcount, table, route_destid,
1465 module_put(ops->owner);
1468 spin_unlock(&rdev->rswitch->lock);
1471 rio_unlock_device(rdev->net->hport, rdev->destid,
1475 EXPORT_SYMBOL_GPL(rio_route_get_entry);
1478 * rio_route_clr_table - Clear a switch routing table
1480 * @table: Routing table ID
1481 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)
1483 * If available calls the switch specific clr_table() method to clear a switch
1484 * routing table. Otherwise uses standard RT write method as defined by RapidIO
1485 * specification. A specific routing table can be selected using the @table
1486 * argument if a switch has per port routing tables or the standard (or global)
1487 * table may be used by passing %RIO_GLOBAL_TABLE in @table.
1489 * Returns %0 on success or %-EINVAL on failure.
1491 int rio_route_clr_table(struct rio_dev *rdev, u16 table, int lock)
1494 struct rio_switch_ops *ops = rdev->rswitch->ops;
1497 rc = rio_lock_device(rdev->net->hport, rdev->destid,
1498 rdev->hopcount, 1000);
1503 spin_lock(&rdev->rswitch->lock);
1505 if (ops == NULL || ops->clr_table == NULL) {
1506 rc = rio_std_route_clr_table(rdev->net->hport, rdev->destid,
1507 rdev->hopcount, table);
1508 } else if (try_module_get(ops->owner)) {
1509 rc = ops->clr_table(rdev->net->hport, rdev->destid,
1510 rdev->hopcount, table);
1512 module_put(ops->owner);
1515 spin_unlock(&rdev->rswitch->lock);
1518 rio_unlock_device(rdev->net->hport, rdev->destid,
1523 EXPORT_SYMBOL_GPL(rio_route_clr_table);
1525 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1527 static bool rio_chan_filter(struct dma_chan *chan, void *arg)
1529 struct rio_mport *mport = arg;
1531 /* Check that DMA device belongs to the right MPORT */
1532 return mport == container_of(chan->device, struct rio_mport, dma);
1536 * rio_request_mport_dma - request RapidIO capable DMA channel associated
1537 * with specified local RapidIO mport device.
1538 * @mport: RIO mport to perform DMA data transfers
1540 * Returns pointer to allocated DMA channel or NULL if failed.
1542 struct dma_chan *rio_request_mport_dma(struct rio_mport *mport)
1544 dma_cap_mask_t mask;
1547 dma_cap_set(DMA_SLAVE, mask);
1548 return dma_request_channel(mask, rio_chan_filter, mport);
1550 EXPORT_SYMBOL_GPL(rio_request_mport_dma);
1553 * rio_request_dma - request RapidIO capable DMA channel that supports
1554 * specified target RapidIO device.
1555 * @rdev: RIO device associated with DMA transfer
1557 * Returns pointer to allocated DMA channel or NULL if failed.
1559 struct dma_chan *rio_request_dma(struct rio_dev *rdev)
1561 return rio_request_mport_dma(rdev->net->hport);
1563 EXPORT_SYMBOL_GPL(rio_request_dma);
1566 * rio_release_dma - release specified DMA channel
1567 * @dchan: DMA channel to release
1569 void rio_release_dma(struct dma_chan *dchan)
1571 dma_release_channel(dchan);
1573 EXPORT_SYMBOL_GPL(rio_release_dma);
1576 * rio_dma_prep_xfer - RapidIO specific wrapper
1577 * for device_prep_slave_sg callback defined by DMAENGINE.
1578 * @dchan: DMA channel to configure
1579 * @destid: target RapidIO device destination ID
1580 * @data: RIO specific data descriptor
1581 * @direction: DMA data transfer direction (TO or FROM the device)
1582 * @flags: dmaengine defined flags
1584 * Initializes RapidIO capable DMA channel for the specified data transfer.
1585 * Uses DMA channel private extension to pass information related to remote
1586 * target RIO device.
1587 * Returns pointer to DMA transaction descriptor or NULL if failed.
1589 struct dma_async_tx_descriptor *rio_dma_prep_xfer(struct dma_chan *dchan,
1590 u16 destid, struct rio_dma_data *data,
1591 enum dma_transfer_direction direction, unsigned long flags)
1593 struct rio_dma_ext rio_ext;
1595 if (dchan->device->device_prep_slave_sg == NULL) {
1596 pr_err("%s: prep_rio_sg == NULL\n", __func__);
1600 rio_ext.destid = destid;
1601 rio_ext.rio_addr_u = data->rio_addr_u;
1602 rio_ext.rio_addr = data->rio_addr;
1603 rio_ext.wr_type = data->wr_type;
1605 return dmaengine_prep_rio_sg(dchan, data->sg, data->sg_len,
1606 direction, flags, &rio_ext);
1608 EXPORT_SYMBOL_GPL(rio_dma_prep_xfer);
1611 * rio_dma_prep_slave_sg - RapidIO specific wrapper
1612 * for device_prep_slave_sg callback defined by DMAENGINE.
1613 * @rdev: RIO device control structure
1614 * @dchan: DMA channel to configure
1615 * @data: RIO specific data descriptor
1616 * @direction: DMA data transfer direction (TO or FROM the device)
1617 * @flags: dmaengine defined flags
1619 * Initializes RapidIO capable DMA channel for the specified data transfer.
1620 * Uses DMA channel private extension to pass information related to remote
1621 * target RIO device.
1622 * Returns pointer to DMA transaction descriptor or NULL if failed.
1624 struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(struct rio_dev *rdev,
1625 struct dma_chan *dchan, struct rio_dma_data *data,
1626 enum dma_transfer_direction direction, unsigned long flags)
1628 return rio_dma_prep_xfer(dchan, rdev->destid, data, direction, flags);
1630 EXPORT_SYMBOL_GPL(rio_dma_prep_slave_sg);
1632 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1635 * rio_find_mport - find RIO mport by its ID
1636 * @mport_id: number (ID) of mport device
1638 * Given a RIO mport number, the desired mport is located
1639 * in the global list of mports. If the mport is found, a pointer to its
1640 * data structure is returned. If no mport is found, %NULL is returned.
1642 struct rio_mport *rio_find_mport(int mport_id)
1644 struct rio_mport *port;
1646 mutex_lock(&rio_mport_list_lock);
1647 list_for_each_entry(port, &rio_mports, node) {
1648 if (port->id == mport_id)
1653 mutex_unlock(&rio_mport_list_lock);
1659 * rio_register_scan - enumeration/discovery method registration interface
1660 * @mport_id: mport device ID for which fabric scan routine has to be set
1661 * (RIO_MPORT_ANY = set for all available mports)
1662 * @scan_ops: enumeration/discovery operations structure
1664 * Registers enumeration/discovery operations with RapidIO subsystem and
1665 * attaches it to the specified mport device (or all available mports
1666 * if RIO_MPORT_ANY is specified).
1668 * Returns error if the mport already has an enumerator attached to it.
1669 * In case of RIO_MPORT_ANY skips mports with valid scan routines (no error).
1671 int rio_register_scan(int mport_id, struct rio_scan *scan_ops)
1673 struct rio_mport *port;
1674 struct rio_scan_node *scan;
1677 pr_debug("RIO: %s for mport_id=%d\n", __func__, mport_id);
1679 if ((mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS) ||
1683 mutex_lock(&rio_mport_list_lock);
1686 * Check if there is another enumerator already registered for
1687 * the same mport ID (including RIO_MPORT_ANY). Multiple enumerators
1688 * for the same mport ID are not supported.
1690 list_for_each_entry(scan, &rio_scans, node) {
1691 if (scan->mport_id == mport_id) {
1698 * Allocate and initialize new scan registration node.
1700 scan = kzalloc(sizeof(*scan), GFP_KERNEL);
1706 scan->mport_id = mport_id;
1707 scan->ops = scan_ops;
1710 * Traverse the list of registered mports to attach this new scan.
1712 * The new scan with matching mport ID overrides any previously attached
1713 * scan assuming that old scan (if any) is the default one (based on the
1714 * enumerator registration check above).
1715 * If the new scan is the global one, it will be attached only to mports
1716 * that do not have their own individual operations already attached.
1718 list_for_each_entry(port, &rio_mports, node) {
1719 if (port->id == mport_id) {
1720 port->nscan = scan_ops;
1722 } else if (mport_id == RIO_MPORT_ANY && !port->nscan)
1723 port->nscan = scan_ops;
1726 list_add_tail(&scan->node, &rio_scans);
1729 mutex_unlock(&rio_mport_list_lock);
1733 EXPORT_SYMBOL_GPL(rio_register_scan);
1736 * rio_unregister_scan - removes enumeration/discovery method from mport
1737 * @mport_id: mport device ID for which fabric scan routine has to be
1738 * unregistered (RIO_MPORT_ANY = apply to all mports that use
1739 * the specified scan_ops)
1740 * @scan_ops: enumeration/discovery operations structure
1742 * Removes enumeration or discovery method assigned to the specified mport
1743 * device. If RIO_MPORT_ANY is specified, removes the specified operations from
1744 * all mports that have them attached.
1746 int rio_unregister_scan(int mport_id, struct rio_scan *scan_ops)
1748 struct rio_mport *port;
1749 struct rio_scan_node *scan;
1751 pr_debug("RIO: %s for mport_id=%d\n", __func__, mport_id);
1753 if (mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS)
1756 mutex_lock(&rio_mport_list_lock);
1758 list_for_each_entry(port, &rio_mports, node)
1759 if (port->id == mport_id ||
1760 (mport_id == RIO_MPORT_ANY && port->nscan == scan_ops))
1763 list_for_each_entry(scan, &rio_scans, node) {
1764 if (scan->mport_id == mport_id) {
1765 list_del(&scan->node);
1771 mutex_unlock(&rio_mport_list_lock);
1775 EXPORT_SYMBOL_GPL(rio_unregister_scan);
1778 * rio_mport_scan - execute enumeration/discovery on the specified mport
1779 * @mport_id: number (ID) of mport device
1781 int rio_mport_scan(int mport_id)
1783 struct rio_mport *port = NULL;
1786 mutex_lock(&rio_mport_list_lock);
1787 list_for_each_entry(port, &rio_mports, node) {
1788 if (port->id == mport_id)
1791 mutex_unlock(&rio_mport_list_lock);
1795 mutex_unlock(&rio_mport_list_lock);
1799 if (!try_module_get(port->nscan->owner)) {
1800 mutex_unlock(&rio_mport_list_lock);
1804 mutex_unlock(&rio_mport_list_lock);
1806 if (port->host_deviceid >= 0)
1807 rc = port->nscan->enumerate(port, 0);
1809 rc = port->nscan->discover(port, RIO_SCAN_ENUM_NO_WAIT);
1811 module_put(port->nscan->owner);
1815 static void rio_fixup_device(struct rio_dev *dev)
1819 static int rio_init(void)
1821 struct rio_dev *dev = NULL;
1823 while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
1824 rio_fixup_device(dev);
1829 static struct workqueue_struct *rio_wq;
1831 struct rio_disc_work {
1832 struct work_struct work;
1833 struct rio_mport *mport;
1836 static void disc_work_handler(struct work_struct *_work)
1838 struct rio_disc_work *work;
1840 work = container_of(_work, struct rio_disc_work, work);
1841 pr_debug("RIO: discovery work for mport %d %s\n",
1842 work->mport->id, work->mport->name);
1843 if (try_module_get(work->mport->nscan->owner)) {
1844 work->mport->nscan->discover(work->mport, 0);
1845 module_put(work->mport->nscan->owner);
1849 int rio_init_mports(void)
1851 struct rio_mport *port;
1852 struct rio_disc_work *work;
1859 * First, run enumerations and check if we need to perform discovery
1860 * on any of the registered mports.
1862 mutex_lock(&rio_mport_list_lock);
1863 list_for_each_entry(port, &rio_mports, node) {
1864 if (port->host_deviceid >= 0) {
1865 if (port->nscan && try_module_get(port->nscan->owner)) {
1866 port->nscan->enumerate(port, 0);
1867 module_put(port->nscan->owner);
1872 mutex_unlock(&rio_mport_list_lock);
1878 * If we have mports that require discovery schedule a discovery work
1879 * for each of them. If the code below fails to allocate needed
1880 * resources, exit without error to keep results of enumeration
1882 * TODO: Implement restart of discovery process for all or
1883 * individual discovering mports.
1885 rio_wq = alloc_workqueue("riodisc", 0, 0);
1887 pr_err("RIO: unable allocate rio_wq\n");
1891 work = kcalloc(n, sizeof *work, GFP_KERNEL);
1893 pr_err("RIO: no memory for work struct\n");
1894 destroy_workqueue(rio_wq);
1899 mutex_lock(&rio_mport_list_lock);
1900 list_for_each_entry(port, &rio_mports, node) {
1901 if (port->host_deviceid < 0 && port->nscan) {
1902 work[n].mport = port;
1903 INIT_WORK(&work[n].work, disc_work_handler);
1904 queue_work(rio_wq, &work[n].work);
1909 flush_workqueue(rio_wq);
1910 mutex_unlock(&rio_mport_list_lock);
1911 pr_debug("RIO: destroy discovery workqueue\n");
1912 destroy_workqueue(rio_wq);
1921 static int rio_get_hdid(int index)
1923 if (ids_num == 0 || ids_num <= index || index >= RIO_MAX_MPORTS)
1929 int rio_register_mport(struct rio_mport *port)
1931 struct rio_scan_node *scan = NULL;
1934 if (next_portid >= RIO_MAX_MPORTS) {
1935 pr_err("RIO: reached specified max number of mports\n");
1939 port->id = next_portid++;
1940 port->host_deviceid = rio_get_hdid(port->id);
1943 dev_set_name(&port->dev, "rapidio%d", port->id);
1944 port->dev.class = &rio_mport_class;
1946 res = device_register(&port->dev);
1948 dev_err(&port->dev, "RIO: mport%d registration failed ERR=%d\n",
1951 dev_dbg(&port->dev, "RIO: mport%d registered\n", port->id);
1953 mutex_lock(&rio_mport_list_lock);
1954 list_add_tail(&port->node, &rio_mports);
1957 * Check if there are any registered enumeration/discovery operations
1958 * that have to be attached to the added mport.
1960 list_for_each_entry(scan, &rio_scans, node) {
1961 if (port->id == scan->mport_id ||
1962 scan->mport_id == RIO_MPORT_ANY) {
1963 port->nscan = scan->ops;
1964 if (port->id == scan->mport_id)
1968 mutex_unlock(&rio_mport_list_lock);
1970 pr_debug("RIO: %s %s id=%d\n", __func__, port->name, port->id);
1973 EXPORT_SYMBOL_GPL(rio_register_mport);
1975 EXPORT_SYMBOL_GPL(rio_local_get_device_id);
1976 EXPORT_SYMBOL_GPL(rio_get_device);
1977 EXPORT_SYMBOL_GPL(rio_get_asm);
1978 EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
1979 EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
1980 EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
1981 EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
1982 EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
1983 EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
1984 EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
1985 EXPORT_SYMBOL_GPL(rio_release_outb_mbox);
1986 EXPORT_SYMBOL_GPL(rio_init_mports);