2 * RapidIO enumeration and discovery support
4 * Copyright 2005 MontaVista Software, Inc.
5 * Matt Porter <mporter@kernel.crashing.org>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
13 #include <linux/types.h>
14 #include <linux/kernel.h>
16 #include <linux/delay.h>
17 #include <linux/dma-mapping.h>
18 #include <linux/init.h>
19 #include <linux/rio.h>
20 #include <linux/rio_drv.h>
21 #include <linux/rio_ids.h>
22 #include <linux/rio_regs.h>
23 #include <linux/module.h>
24 #include <linux/spinlock.h>
25 #include <linux/timer.h>
26 #include <linux/jiffies.h>
27 #include <linux/slab.h>
31 LIST_HEAD(rio_devices);
32 static LIST_HEAD(rio_switches);
34 #define RIO_ENUM_CMPL_MAGIC 0xdeadbeef
36 static void rio_enum_timeout(unsigned long);
38 DEFINE_SPINLOCK(rio_global_list_lock);
40 static int next_destid = 0;
41 static int next_switchid = 0;
42 static int next_net = 0;
44 static struct timer_list rio_enum_timer =
45 TIMER_INITIALIZER(rio_enum_timeout, 0, 0);
47 static int rio_mport_phys_table[] = {
49 RIO_EFB_PAR_EP_REC_ID,
51 RIO_EFB_SER_EP_REC_ID,
55 static int rio_sport_phys_table[] = {
56 RIO_EFB_PAR_EP_FREE_ID,
57 RIO_EFB_SER_EP_FREE_ID,
58 RIO_EFB_SER_EP_FREC_ID,
63 * rio_get_device_id - Get the base/extended device id for a device
64 * @port: RIO master port
65 * @destid: Destination ID of device
66 * @hopcount: Hopcount to device
68 * Reads the base/extended device id from a device. Returns the
71 static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
75 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
77 return RIO_GET_DID(port->sys_size, result);
81 * rio_set_device_id - Set the base/extended device id for a device
82 * @port: RIO master port
83 * @destid: Destination ID of device
84 * @hopcount: Hopcount to device
85 * @did: Device ID value to be written
87 * Writes the base/extended device id from a device.
89 static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
91 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
92 RIO_SET_DID(port->sys_size, did));
96 * rio_local_set_device_id - Set the base/extended device id for a port
97 * @port: RIO master port
98 * @did: Device ID value to be written
100 * Writes the base/extended device id from a device.
102 static void rio_local_set_device_id(struct rio_mport *port, u16 did)
104 rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
109 * rio_clear_locks- Release all host locks and signal enumeration complete
110 * @port: Master port to issue transaction
112 * Marks the component tag CSR on each device with the enumeration
113 * complete flag. When complete, it then release the host locks on
114 * each device. Returns 0 on success or %-EINVAL on failure.
116 static int rio_clear_locks(struct rio_mport *port)
118 struct rio_dev *rdev;
122 /* Write component tag CSR magic complete value */
123 rio_local_write_config_32(port, RIO_COMPONENT_TAG_CSR,
124 RIO_ENUM_CMPL_MAGIC);
125 list_for_each_entry(rdev, &rio_devices, global_list)
126 rio_write_config_32(rdev, RIO_COMPONENT_TAG_CSR,
127 RIO_ENUM_CMPL_MAGIC);
129 /* Release host device id locks */
130 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
131 port->host_deviceid);
132 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
133 if ((result & 0xffff) != 0xffff) {
135 "RIO: badness when releasing host lock on master port, result %8.8x\n",
139 list_for_each_entry(rdev, &rio_devices, global_list) {
140 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
141 port->host_deviceid);
142 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
143 if ((result & 0xffff) != 0xffff) {
145 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
146 rdev->vid, rdev->did);
155 * rio_enum_host- Set host lock and initialize host destination ID
156 * @port: Master port to issue transaction
158 * Sets the local host master port lock and destination ID register
159 * with the host device ID value. The host device ID value is provided
160 * by the platform. Returns %0 on success or %-1 on failure.
162 static int rio_enum_host(struct rio_mport *port)
166 /* Set master port host device id lock */
167 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
168 port->host_deviceid);
170 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
171 if ((result & 0xffff) != port->host_deviceid)
174 /* Set master port destid and init destid ctr */
175 rio_local_set_device_id(port, port->host_deviceid);
177 if (next_destid == port->host_deviceid)
184 * rio_device_has_destid- Test if a device contains a destination ID register
185 * @port: Master port to issue transaction
186 * @src_ops: RIO device source operations
187 * @dst_ops: RIO device destination operations
189 * Checks the provided @src_ops and @dst_ops for the necessary transaction
190 * capabilities that indicate whether or not a device will implement a
191 * destination ID register. Returns 1 if true or 0 if false.
193 static int rio_device_has_destid(struct rio_mport *port, int src_ops,
196 u32 mask = RIO_OPS_READ | RIO_OPS_WRITE | RIO_OPS_ATOMIC_TST_SWP | RIO_OPS_ATOMIC_INC | RIO_OPS_ATOMIC_DEC | RIO_OPS_ATOMIC_SET | RIO_OPS_ATOMIC_CLR;
198 return !!((src_ops | dst_ops) & mask);
202 * rio_release_dev- Frees a RIO device struct
203 * @dev: LDM device associated with a RIO device struct
205 * Gets the RIO device struct associated a RIO device struct.
206 * The RIO device struct is freed.
208 static void rio_release_dev(struct device *dev)
210 struct rio_dev *rdev;
212 rdev = to_rio_dev(dev);
217 * rio_is_switch- Tests if a RIO device has switch capabilities
220 * Gets the RIO device Processing Element Features register
221 * contents and tests for switch capabilities. Returns 1 if
222 * the device is a switch or 0 if it is not a switch.
223 * The RIO device struct is freed.
225 static int rio_is_switch(struct rio_dev *rdev)
227 if (rdev->pef & RIO_PEF_SWITCH)
233 * rio_route_set_ops- Sets routing operations for a particular vendor switch
236 * Searches the RIO route ops table for known switch types. If the vid
237 * and did match a switch table entry, then set the add_entry() and
238 * get_entry() ops to the table entry values.
240 static void rio_route_set_ops(struct rio_dev *rdev)
242 struct rio_route_ops *cur = __start_rio_route_ops;
243 struct rio_route_ops *end = __end_rio_route_ops;
246 if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
247 pr_debug("RIO: adding routing ops for %s\n", rio_name(rdev));
248 rdev->rswitch->add_entry = cur->add_hook;
249 rdev->rswitch->get_entry = cur->get_hook;
250 rdev->rswitch->clr_table = cur->clr_hook;
256 if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) {
257 pr_debug("RIO: adding STD routing ops for %s\n",
259 rdev->rswitch->add_entry = rio_std_route_add_entry;
260 rdev->rswitch->get_entry = rio_std_route_get_entry;
261 rdev->rswitch->clr_table = rio_std_route_clr_table;
264 if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
265 printk(KERN_ERR "RIO: missing routing ops for %s\n",
270 * rio_add_device- Adds a RIO device to the device model
273 * Adds the RIO device to the global device list and adds the RIO
274 * device to the RIO device list. Creates the generic sysfs nodes
277 static int __devinit rio_add_device(struct rio_dev *rdev)
281 err = device_add(&rdev->dev);
285 spin_lock(&rio_global_list_lock);
286 list_add_tail(&rdev->global_list, &rio_devices);
287 spin_unlock(&rio_global_list_lock);
289 rio_create_sysfs_dev_files(rdev);
295 * rio_setup_device- Allocates and sets up a RIO device
297 * @port: Master port to send transactions
298 * @destid: Current destination ID
299 * @hopcount: Current hopcount
300 * @do_enum: Enumeration/Discovery mode flag
302 * Allocates a RIO device and configures fields based on configuration
303 * space contents. If device has a destination ID register, a destination
304 * ID is either assigned in enumeration mode or read from configuration
305 * space in discovery mode. If the device has switch capabilities, then
306 * a switch is allocated and configured appropriately. Returns a pointer
307 * to a RIO device on success or NULL on failure.
310 static struct rio_dev __devinit *rio_setup_device(struct rio_net *net,
311 struct rio_mport *port, u16 destid,
312 u8 hopcount, int do_enum)
315 struct rio_dev *rdev;
316 struct rio_switch *rswitch = NULL;
319 rdev = kzalloc(sizeof(struct rio_dev), GFP_KERNEL);
324 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
326 rdev->did = result >> 16;
327 rdev->vid = result & 0xffff;
328 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
330 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
332 rdev->asm_did = result >> 16;
333 rdev->asm_vid = result & 0xffff;
334 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
336 rdev->asm_rev = result >> 16;
337 rio_mport_read_config_32(port, destid, hopcount, RIO_PEF_CAR,
339 if (rdev->pef & RIO_PEF_EXT_FEATURES)
340 rdev->efptr = result & 0xffff;
342 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
344 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
347 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
349 rio_set_device_id(port, destid, hopcount, next_destid);
350 rdev->destid = next_destid++;
351 if (next_destid == port->host_deviceid)
354 rdev->destid = rio_get_device_id(port, destid, hopcount);
356 /* Switch device has an associated destID */
357 rdev->destid = RIO_INVALID_DESTID;
359 /* If a PE has both switch and other functions, show it as a switch */
360 if (rio_is_switch(rdev)) {
361 rio_mport_read_config_32(port, destid, hopcount,
362 RIO_SWP_INFO_CAR, &rdev->swpinfo);
363 rswitch = kzalloc(sizeof(struct rio_switch), GFP_KERNEL);
366 rswitch->switchid = next_switchid;
367 rswitch->hopcount = hopcount;
368 rswitch->destid = destid;
369 rswitch->route_table = kzalloc(sizeof(u8)*
370 RIO_MAX_ROUTE_ENTRIES(port->sys_size),
372 if (!rswitch->route_table)
374 /* Initialize switch route table */
375 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
377 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
378 rdev->rswitch = rswitch;
379 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
380 rdev->rswitch->switchid);
381 rio_route_set_ops(rdev);
383 if (do_enum && rdev->rswitch->clr_table)
384 rdev->rswitch->clr_table(port, destid, hopcount,
387 list_add_tail(&rswitch->node, &rio_switches);
390 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
393 rdev->dev.bus = &rio_bus_type;
395 device_initialize(&rdev->dev);
396 rdev->dev.release = rio_release_dev;
399 rdev->dma_mask = DMA_BIT_MASK(32);
400 rdev->dev.dma_mask = &rdev->dma_mask;
401 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
403 if ((rdev->pef & RIO_PEF_INB_DOORBELL) &&
404 (rdev->dst_ops & RIO_DST_OPS_DOORBELL))
405 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
408 ret = rio_add_device(rdev);
416 kfree(rswitch->route_table);
424 * rio_sport_is_active- Tests if a switch port has an active connection.
425 * @port: Master port to send transaction
426 * @destid: Associated destination ID for switch
427 * @hopcount: Hopcount to reach switch
428 * @sport: Switch port number
430 * Reads the port error status CSR for a particular switch port to
431 * determine if the port has an active link. Returns
432 * %PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
436 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
441 int *entry = rio_sport_phys_table;
445 rio_mport_get_feature(port, 0, destid, hopcount, *entry)))
448 } while (*++entry >= 0);
451 rio_mport_read_config_32(port, destid, hopcount,
453 RIO_PORT_N_ERR_STS_CSR(sport),
456 return (result & PORT_N_ERR_STS_PORT_OK);
460 * rio_route_add_entry- Add a route entry to a switch routing table
461 * @mport: Master port to send transaction
462 * @rswitch: Switch device
463 * @table: Routing table ID
464 * @route_destid: Destination ID to be routed
465 * @route_port: Port number to be routed
467 * Calls the switch specific add_entry() method to add a route entry
468 * on a switch. The route table can be specified using the @table
469 * argument if a switch has per port routing tables or the normal
470 * use is to specific all tables (or the global table) by passing
471 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
474 static int rio_route_add_entry(struct rio_mport *mport, struct rio_switch *rswitch,
475 u16 table, u16 route_destid, u8 route_port)
477 return rswitch->add_entry(mport, rswitch->destid,
478 rswitch->hopcount, table,
479 route_destid, route_port);
483 * rio_route_get_entry- Read a route entry in a switch routing table
484 * @mport: Master port to send transaction
485 * @rswitch: Switch device
486 * @table: Routing table ID
487 * @route_destid: Destination ID to be routed
488 * @route_port: Pointer to read port number into
490 * Calls the switch specific get_entry() method to read a route entry
491 * in a switch. The route table can be specified using the @table
492 * argument if a switch has per port routing tables or the normal
493 * use is to specific all tables (or the global table) by passing
494 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
498 rio_route_get_entry(struct rio_mport *mport, struct rio_switch *rswitch, u16 table,
499 u16 route_destid, u8 * route_port)
501 return rswitch->get_entry(mport, rswitch->destid,
502 rswitch->hopcount, table,
503 route_destid, route_port);
507 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
508 * @port: Master port to send transaction
509 * @hopcount: Number of hops to the device
511 * Used during enumeration to read the Host Device ID Lock CSR on a
512 * RIO device. Returns the value of the lock register.
514 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
518 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
519 RIO_HOST_DID_LOCK_CSR, &result);
521 return (u16) (result & 0xffff);
525 * rio_get_swpinfo_inport- Gets the ingress port number
526 * @mport: Master port to send transaction
527 * @destid: Destination ID associated with the switch
528 * @hopcount: Number of hops to the device
530 * Returns port number being used to access the switch device.
533 rio_get_swpinfo_inport(struct rio_mport *mport, u16 destid, u8 hopcount)
537 rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR,
540 return (u8) (result & 0xff);
544 * rio_get_swpinfo_tports- Gets total number of ports on the switch
545 * @mport: Master port to send transaction
546 * @destid: Destination ID associated with the switch
547 * @hopcount: Number of hops to the device
549 * Returns total numbers of ports implemented by the switch device.
551 static u8 rio_get_swpinfo_tports(struct rio_mport *mport, u16 destid,
556 rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR,
559 return RIO_GET_TOTAL_PORTS(result);
563 * rio_net_add_mport- Add a master port to a RIO network
565 * @port: Master port to add
567 * Adds a master port to the network list of associated master
570 static void rio_net_add_mport(struct rio_net *net, struct rio_mport *port)
572 spin_lock(&rio_global_list_lock);
573 list_add_tail(&port->nnode, &net->mports);
574 spin_unlock(&rio_global_list_lock);
578 * rio_enum_peer- Recursively enumerate a RIO network through a master port
579 * @net: RIO network being enumerated
580 * @port: Master port to send transactions
581 * @hopcount: Number of hops into the network
583 * Recursively enumerates a RIO network. Transactions are sent via the
584 * master port passed in @port.
586 static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
594 struct rio_dev *rdev;
598 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
599 pr_debug("RIO: PE already discovered by this host\n");
601 * Already discovered by this host. Add it as another
602 * master port for the current network.
604 rio_net_add_mport(net, port);
608 /* Attempt to acquire device lock */
609 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
611 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
612 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
613 < port->host_deviceid) {
616 /* Attempt to acquire device lock again */
617 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
619 RIO_HOST_DID_LOCK_CSR,
620 port->host_deviceid);
623 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
625 "RIO: PE locked by a higher priority host...retreating\n");
629 /* Setup new RIO device */
630 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
633 /* Add device to the global and bus/net specific list. */
634 list_add_tail(&rdev->net_list, &net->devices);
638 if (rio_is_switch(rdev)) {
640 sw_inport = rio_get_swpinfo_inport(port,
641 RIO_ANY_DESTID(port->sys_size), hopcount);
642 rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
643 port->host_deviceid, sw_inport);
644 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
646 for (destid = 0; destid < next_destid; destid++) {
647 if (destid == port->host_deviceid)
649 rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
651 rdev->rswitch->route_table[destid] = sw_inport;
655 rio_get_swpinfo_tports(port, RIO_ANY_DESTID(port->sys_size),
658 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
659 rio_name(rdev), rdev->vid, rdev->did, num_ports);
660 sw_destid = next_destid;
661 for (port_num = 0; port_num < num_ports; port_num++) {
662 if (sw_inport == port_num)
665 cur_destid = next_destid;
667 if (rio_sport_is_active
668 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
671 "RIO: scanning device on port %d\n",
673 rio_route_add_entry(port, rdev->rswitch,
675 RIO_ANY_DESTID(port->sys_size),
678 if (rio_enum_peer(net, port, hopcount + 1) < 0)
681 /* Update routing tables */
682 if (next_destid > cur_destid) {
683 for (destid = cur_destid;
684 destid < next_destid; destid++) {
685 if (destid == port->host_deviceid)
687 rio_route_add_entry(port, rdev->rswitch,
692 route_table[destid] =
699 /* Check for empty switch */
700 if (next_destid == sw_destid) {
702 if (next_destid == port->host_deviceid)
706 rdev->rswitch->destid = sw_destid;
708 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
709 rio_name(rdev), rdev->vid, rdev->did);
715 * rio_enum_complete- Tests if enumeration of a network is complete
716 * @port: Master port to send transaction
718 * Tests the Component Tag CSR for presence of the magic enumeration
719 * complete flag. Return %1 if enumeration is complete or %0 if
720 * enumeration is incomplete.
722 static int rio_enum_complete(struct rio_mport *port)
727 rio_local_read_config_32(port, RIO_COMPONENT_TAG_CSR, &tag_csr);
729 if (tag_csr == RIO_ENUM_CMPL_MAGIC)
736 * rio_disc_peer- Recursively discovers a RIO network through a master port
737 * @net: RIO network being discovered
738 * @port: Master port to send transactions
739 * @destid: Current destination ID in network
740 * @hopcount: Number of hops into the network
742 * Recursively discovers a RIO network. Transactions are sent via the
743 * master port passed in @port.
746 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
749 u8 port_num, route_port;
751 struct rio_dev *rdev;
754 /* Setup new RIO device */
755 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
756 /* Add device to the global and bus/net specific list. */
757 list_add_tail(&rdev->net_list, &net->devices);
761 if (rio_is_switch(rdev)) {
764 /* Associated destid is how we accessed this switch */
765 rdev->rswitch->destid = destid;
767 num_ports = rio_get_swpinfo_tports(port, destid, hopcount);
769 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
770 rio_name(rdev), rdev->vid, rdev->did, num_ports);
771 for (port_num = 0; port_num < num_ports; port_num++) {
772 if (rio_get_swpinfo_inport(port, destid, hopcount) ==
776 if (rio_sport_is_active
777 (port, destid, hopcount, port_num)) {
779 "RIO: scanning device on port %d\n",
782 ndestid < RIO_ANY_DESTID(port->sys_size);
784 rio_route_get_entry(port, rdev->rswitch,
788 if (route_port == port_num)
793 (net, port, ndestid, hopcount + 1) < 0)
798 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
799 rio_name(rdev), rdev->vid, rdev->did);
805 * rio_mport_is_active- Tests if master port link is active
806 * @port: Master port to test
808 * Reads the port error status CSR for the master port to
809 * determine if the port has an active link. Returns
810 * %PORT_N_ERR_STS_PORT_OK if the master port is active
811 * or %0 if it is inactive.
813 static int rio_mport_is_active(struct rio_mport *port)
817 int *entry = rio_mport_phys_table;
821 rio_mport_get_feature(port, 1, 0, 0, *entry)))
823 } while (*++entry >= 0);
826 rio_local_read_config_32(port,
828 RIO_PORT_N_ERR_STS_CSR(port->index),
831 return (result & PORT_N_ERR_STS_PORT_OK);
835 * rio_alloc_net- Allocate and configure a new RIO network
836 * @port: Master port associated with the RIO network
838 * Allocates a RIO network structure, initializes per-network
839 * list heads, and adds the associated master port to the
840 * network list of associated master ports. Returns a
841 * RIO network pointer on success or %NULL on failure.
843 static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
847 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
849 INIT_LIST_HEAD(&net->node);
850 INIT_LIST_HEAD(&net->devices);
851 INIT_LIST_HEAD(&net->mports);
852 list_add_tail(&port->nnode, &net->mports);
854 net->id = next_net++;
860 * rio_update_route_tables- Updates route tables in switches
861 * @port: Master port associated with the RIO network
863 * For each enumerated device, ensure that each switch in a system
864 * has correct routing entries. Add routes for devices that where
865 * unknown dirung the first enumeration pass through the switch.
867 static void rio_update_route_tables(struct rio_mport *port)
869 struct rio_dev *rdev;
870 struct rio_switch *rswitch;
874 list_for_each_entry(rdev, &rio_devices, global_list) {
876 destid = (rio_is_switch(rdev))?rdev->rswitch->destid:rdev->destid;
878 list_for_each_entry(rswitch, &rio_switches, node) {
880 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
883 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
884 /* Skip if destid ends in empty switch*/
885 if (rswitch->destid == destid)
888 sport = rio_get_swpinfo_inport(port,
889 rswitch->destid, rswitch->hopcount);
891 if (rswitch->add_entry) {
892 rio_route_add_entry(port, rswitch, RIO_GLOBAL_TABLE, destid, sport);
893 rswitch->route_table[destid] = sport;
901 * rio_enum_mport- Start enumeration through a master port
902 * @mport: Master port to send transactions
904 * Starts the enumeration process. If somebody has enumerated our
905 * master port device, then give up. If not and we have an active
906 * link, then start recursive peer enumeration. Returns %0 if
907 * enumeration succeeds or %-EBUSY if enumeration fails.
909 int __devinit rio_enum_mport(struct rio_mport *mport)
911 struct rio_net *net = NULL;
914 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
916 /* If somebody else enumerated our master port device, bail. */
917 if (rio_enum_host(mport) < 0) {
919 "RIO: master port %d device has been enumerated by a remote host\n",
925 /* If master port has an active link, allocate net and enum peers */
926 if (rio_mport_is_active(mport)) {
927 if (!(net = rio_alloc_net(mport))) {
928 printk(KERN_ERR "RIO: failed to allocate new net\n");
932 if (rio_enum_peer(net, mport, 0) < 0) {
933 /* A higher priority host won enumeration, bail. */
935 "RIO: master port %d device has lost enumeration to a remote host\n",
937 rio_clear_locks(mport);
941 rio_update_route_tables(mport);
942 rio_clear_locks(mport);
944 printk(KERN_INFO "RIO: master port %d link inactive\n",
954 * rio_build_route_tables- Generate route tables from switch route entries
956 * For each switch device, generate a route table by copying existing
957 * route entries from the switch.
959 static void rio_build_route_tables(void)
961 struct rio_dev *rdev;
965 list_for_each_entry(rdev, &rio_devices, global_list)
966 if (rio_is_switch(rdev))
968 i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
970 if (rio_route_get_entry
971 (rdev->net->hport, rdev->rswitch, RIO_GLOBAL_TABLE,
974 rdev->rswitch->route_table[i] = sport;
979 * rio_enum_timeout- Signal that enumeration timed out
980 * @data: Address of timeout flag.
982 * When the enumeration complete timer expires, set a flag that
983 * signals to the discovery process that enumeration did not
984 * complete in a sane amount of time.
986 static void rio_enum_timeout(unsigned long data)
988 /* Enumeration timed out, set flag */
993 * rio_disc_mport- Start discovery through a master port
994 * @mport: Master port to send transactions
996 * Starts the discovery process. If we have an active link,
997 * then wait for the signal that enumeration is complete.
998 * When enumeration completion is signaled, start recursive
999 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1002 int __devinit rio_disc_mport(struct rio_mport *mport)
1004 struct rio_net *net = NULL;
1005 int enum_timeout_flag = 0;
1007 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1010 /* If master port has an active link, allocate net and discover peers */
1011 if (rio_mport_is_active(mport)) {
1012 if (!(net = rio_alloc_net(mport))) {
1013 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1017 pr_debug("RIO: wait for enumeration complete...");
1019 rio_enum_timer.expires =
1020 jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1021 rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
1022 add_timer(&rio_enum_timer);
1023 while (!rio_enum_complete(mport)) {
1025 if (enum_timeout_flag) {
1026 del_timer_sync(&rio_enum_timer);
1030 del_timer_sync(&rio_enum_timer);
1033 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1036 "RIO: master port %d device has failed discovery\n",
1041 rio_build_route_tables();
1047 pr_debug("timeout\n");