2 * RapidIO enumeration and discovery support
4 * Copyright 2005 MontaVista Software, Inc.
5 * Matt Porter <mporter@kernel.crashing.org>
7 * Copyright 2009 Integrated Device Technology, Inc.
8 * Alex Bounine <alexandre.bounine@idt.com>
9 * - Added Port-Write/Error Management initialization and handling
11 * Copyright 2009 Sysgo AG
12 * Thomas Moll <thomas.moll@sysgo.com>
13 * - Added Input- Output- enable functionality, to allow full communication
15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms of the GNU General Public License as published by the
17 * Free Software Foundation; either version 2 of the License, or (at your
18 * option) any later version.
21 #include <linux/types.h>
22 #include <linux/kernel.h>
24 #include <linux/delay.h>
25 #include <linux/dma-mapping.h>
26 #include <linux/init.h>
27 #include <linux/rio.h>
28 #include <linux/rio_drv.h>
29 #include <linux/rio_ids.h>
30 #include <linux/rio_regs.h>
31 #include <linux/module.h>
32 #include <linux/spinlock.h>
33 #include <linux/timer.h>
34 #include <linux/sched.h>
35 #include <linux/jiffies.h>
36 #include <linux/slab.h>
40 static void rio_init_em(struct rio_dev *rdev);
43 u16 start; /* logical minimal id */
44 u32 max; /* max number of IDs in table */
46 unsigned long table[0];
49 static int next_destid = 0;
50 static int next_comptag = 1;
52 static int rio_mport_phys_table[] = {
54 RIO_EFB_PAR_EP_REC_ID,
56 RIO_EFB_SER_EP_REC_ID,
62 * rio_destid_alloc - Allocate next available destID for given network
65 * Returns next available device destination ID for the specified RIO network.
66 * Marks allocated ID as one in use.
67 * Returns RIO_INVALID_DESTID if new destID is not available.
69 static u16 rio_destid_alloc(struct rio_net *net)
72 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
74 spin_lock(&idtab->lock);
75 destid = find_first_zero_bit(idtab->table, idtab->max);
77 if (destid < idtab->max) {
78 set_bit(destid, idtab->table);
79 destid += idtab->start;
81 destid = RIO_INVALID_DESTID;
83 spin_unlock(&idtab->lock);
88 * rio_destid_reserve - Reserve the specivied destID
90 * @destid: destID to reserve
92 * Tries to reserve the specified destID.
93 * Returns 0 if successful.
95 static int rio_destid_reserve(struct rio_net *net, u16 destid)
98 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
100 destid -= idtab->start;
101 spin_lock(&idtab->lock);
102 oldbit = test_and_set_bit(destid, idtab->table);
103 spin_unlock(&idtab->lock);
108 * rio_destid_free - free a previously allocated destID
110 * @destid: destID to free
112 * Makes the specified destID available for use.
114 static void rio_destid_free(struct rio_net *net, u16 destid)
116 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
118 destid -= idtab->start;
119 spin_lock(&idtab->lock);
120 clear_bit(destid, idtab->table);
121 spin_unlock(&idtab->lock);
125 * rio_destid_first - return first destID in use
128 static u16 rio_destid_first(struct rio_net *net)
131 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
133 spin_lock(&idtab->lock);
134 destid = find_first_bit(idtab->table, idtab->max);
135 if (destid >= idtab->max)
136 destid = RIO_INVALID_DESTID;
138 destid += idtab->start;
139 spin_unlock(&idtab->lock);
144 * rio_destid_next - return next destID in use
146 * @from: destination ID from which search shall continue
148 static u16 rio_destid_next(struct rio_net *net, u16 from)
151 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
153 spin_lock(&idtab->lock);
154 destid = find_next_bit(idtab->table, idtab->max, from);
155 if (destid >= idtab->max)
156 destid = RIO_INVALID_DESTID;
158 destid += idtab->start;
159 spin_unlock(&idtab->lock);
164 * rio_get_device_id - Get the base/extended device id for a device
165 * @port: RIO master port
166 * @destid: Destination ID of device
167 * @hopcount: Hopcount to device
169 * Reads the base/extended device id from a device. Returns the
170 * 8/16-bit device ID.
172 static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
176 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
178 return RIO_GET_DID(port->sys_size, result);
182 * rio_set_device_id - Set the base/extended device id for a device
183 * @port: RIO master port
184 * @destid: Destination ID of device
185 * @hopcount: Hopcount to device
186 * @did: Device ID value to be written
188 * Writes the base/extended device id from a device.
190 static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
192 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
193 RIO_SET_DID(port->sys_size, did));
197 * rio_clear_locks- Release all host locks and signal enumeration complete
198 * @net: RIO network to run on
200 * Marks the component tag CSR on each device with the enumeration
201 * complete flag. When complete, it then release the host locks on
202 * each device. Returns 0 on success or %-EINVAL on failure.
204 static int rio_clear_locks(struct rio_net *net)
206 struct rio_mport *port = net->hport;
207 struct rio_dev *rdev;
211 /* Release host device id locks */
212 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
213 port->host_deviceid);
214 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
215 if ((result & 0xffff) != 0xffff) {
217 "RIO: badness when releasing host lock on master port, result %8.8x\n",
221 list_for_each_entry(rdev, &net->devices, net_list) {
222 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
223 port->host_deviceid);
224 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
225 if ((result & 0xffff) != 0xffff) {
227 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
228 rdev->vid, rdev->did);
232 /* Mark device as discovered and enable master */
233 rio_read_config_32(rdev,
234 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
236 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
237 rio_write_config_32(rdev,
238 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
246 * rio_enum_host- Set host lock and initialize host destination ID
247 * @port: Master port to issue transaction
249 * Sets the local host master port lock and destination ID register
250 * with the host device ID value. The host device ID value is provided
251 * by the platform. Returns %0 on success or %-1 on failure.
253 static int rio_enum_host(struct rio_mport *port)
257 /* Set master port host device id lock */
258 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
259 port->host_deviceid);
261 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
262 if ((result & 0xffff) != port->host_deviceid)
265 /* Set master port destid and init destid ctr */
266 rio_local_set_device_id(port, port->host_deviceid);
271 * rio_device_has_destid- Test if a device contains a destination ID register
272 * @port: Master port to issue transaction
273 * @src_ops: RIO device source operations
274 * @dst_ops: RIO device destination operations
276 * Checks the provided @src_ops and @dst_ops for the necessary transaction
277 * capabilities that indicate whether or not a device will implement a
278 * destination ID register. Returns 1 if true or 0 if false.
280 static int rio_device_has_destid(struct rio_mport *port, int src_ops,
283 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;
285 return !!((src_ops | dst_ops) & mask);
289 * rio_release_dev- Frees a RIO device struct
290 * @dev: LDM device associated with a RIO device struct
292 * Gets the RIO device struct associated a RIO device struct.
293 * The RIO device struct is freed.
295 static void rio_release_dev(struct device *dev)
297 struct rio_dev *rdev;
299 rdev = to_rio_dev(dev);
304 * rio_is_switch- Tests if a RIO device has switch capabilities
307 * Gets the RIO device Processing Element Features register
308 * contents and tests for switch capabilities. Returns 1 if
309 * the device is a switch or 0 if it is not a switch.
310 * The RIO device struct is freed.
312 static int rio_is_switch(struct rio_dev *rdev)
314 if (rdev->pef & RIO_PEF_SWITCH)
320 * rio_setup_device- Allocates and sets up a RIO device
322 * @port: Master port to send transactions
323 * @destid: Current destination ID
324 * @hopcount: Current hopcount
325 * @do_enum: Enumeration/Discovery mode flag
327 * Allocates a RIO device and configures fields based on configuration
328 * space contents. If device has a destination ID register, a destination
329 * ID is either assigned in enumeration mode or read from configuration
330 * space in discovery mode. If the device has switch capabilities, then
331 * a switch is allocated and configured appropriately. Returns a pointer
332 * to a RIO device on success or NULL on failure.
335 static struct rio_dev *rio_setup_device(struct rio_net *net,
336 struct rio_mport *port, u16 destid,
337 u8 hopcount, int do_enum)
340 struct rio_dev *rdev;
341 struct rio_switch *rswitch = NULL;
346 size = sizeof(struct rio_dev);
347 if (rio_mport_read_config_32(port, destid, hopcount,
348 RIO_PEF_CAR, &result))
351 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
352 rio_mport_read_config_32(port, destid, hopcount,
353 RIO_SWP_INFO_CAR, &swpinfo);
354 if (result & RIO_PEF_SWITCH) {
355 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
356 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
360 rdev = kzalloc(size, GFP_KERNEL);
366 rdev->swpinfo = swpinfo;
367 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
369 rdev->did = result >> 16;
370 rdev->vid = result & 0xffff;
371 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
373 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
375 rdev->asm_did = result >> 16;
376 rdev->asm_vid = result & 0xffff;
377 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
379 rdev->asm_rev = result >> 16;
380 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
381 rdev->efptr = result & 0xffff;
382 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
385 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
386 hopcount, RIO_EFB_ERR_MGMNT);
389 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
391 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
395 /* Assign component tag to device */
396 if (next_comptag >= 0x10000) {
397 pr_err("RIO: Component Tag Counter Overflow\n");
400 rio_mport_write_config_32(port, destid, hopcount,
401 RIO_COMPONENT_TAG_CSR, next_comptag);
402 rdev->comp_tag = next_comptag++;
403 rdev->do_enum = true;
405 rio_mport_read_config_32(port, destid, hopcount,
406 RIO_COMPONENT_TAG_CSR,
410 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
412 rio_set_device_id(port, destid, hopcount, next_destid);
413 rdev->destid = next_destid;
414 next_destid = rio_destid_alloc(net);
416 rdev->destid = rio_get_device_id(port, destid, hopcount);
418 rdev->hopcount = 0xff;
420 /* Switch device has an associated destID which
421 * will be adjusted later
423 rdev->destid = destid;
424 rdev->hopcount = hopcount;
427 /* If a PE has both switch and other functions, show it as a switch */
428 if (rio_is_switch(rdev)) {
429 rswitch = rdev->rswitch;
430 rswitch->port_ok = 0;
431 spin_lock_init(&rswitch->lock);
432 rswitch->route_table = kzalloc(sizeof(u8)*
433 RIO_MAX_ROUTE_ENTRIES(port->sys_size),
435 if (!rswitch->route_table)
437 /* Initialize switch route table */
438 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
440 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
441 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
442 rdev->comp_tag & RIO_CTAG_UDEVID);
445 rio_route_clr_table(rdev, RIO_GLOBAL_TABLE, 0);
448 /*Enable Input Output Port (transmitter reviever)*/
449 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
451 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
452 rdev->comp_tag & RIO_CTAG_UDEVID);
455 rdev->dev.parent = &net->dev;
456 rio_attach_device(rdev);
457 rdev->dev.release = rio_release_dev;
458 rdev->dma_mask = DMA_BIT_MASK(32);
459 rdev->dev.dma_mask = &rdev->dma_mask;
460 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
462 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
463 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
466 ret = rio_add_device(rdev);
476 kfree(rswitch->route_table);
483 * rio_sport_is_active- Tests if a switch port has an active connection.
484 * @port: Master port to send transaction
485 * @destid: Associated destination ID for switch
486 * @hopcount: Hopcount to reach switch
487 * @sport: Switch port number
489 * Reads the port error status CSR for a particular switch port to
490 * determine if the port has an active link. Returns
491 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
495 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
500 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
502 while (ext_ftr_ptr) {
503 rio_mport_read_config_32(port, destid, hopcount,
504 ext_ftr_ptr, &result);
505 result = RIO_GET_BLOCK_ID(result);
506 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
507 (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
508 (result == RIO_EFB_SER_EP_FREC_ID))
511 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
516 rio_mport_read_config_32(port, destid, hopcount,
518 RIO_PORT_N_ERR_STS_CSR(sport),
521 return result & RIO_PORT_N_ERR_STS_PORT_OK;
525 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
526 * @port: Master port to send transaction
527 * @hopcount: Number of hops to the device
529 * Used during enumeration to read the Host Device ID Lock CSR on a
530 * RIO device. Returns the value of the lock register.
532 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
536 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
537 RIO_HOST_DID_LOCK_CSR, &result);
539 return (u16) (result & 0xffff);
543 * rio_enum_peer- Recursively enumerate a RIO network through a master port
544 * @net: RIO network being enumerated
545 * @port: Master port to send transactions
546 * @hopcount: Number of hops into the network
547 * @prev: Previous RIO device connected to the enumerated one
548 * @prev_port: Port on previous RIO device
550 * Recursively enumerates a RIO network. Transactions are sent via the
551 * master port passed in @port.
553 static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
554 u8 hopcount, struct rio_dev *prev, int prev_port)
556 struct rio_dev *rdev;
560 if (rio_mport_chk_dev_access(port,
561 RIO_ANY_DESTID(port->sys_size), hopcount)) {
562 pr_debug("RIO: device access check failed\n");
566 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
567 pr_debug("RIO: PE already discovered by this host\n");
569 * Already discovered by this host. Add it as another
570 * link to the existing device.
572 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
573 hopcount, RIO_COMPONENT_TAG_CSR, ®val);
576 rdev = rio_get_comptag((regval & 0xffff), NULL);
578 if (rdev && prev && rio_is_switch(prev)) {
579 pr_debug("RIO: redundant path to %s\n",
581 prev->rswitch->nextdev[prev_port] = rdev;
588 /* Attempt to acquire device lock */
589 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
591 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
592 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
593 < port->host_deviceid) {
596 /* Attempt to acquire device lock again */
597 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
599 RIO_HOST_DID_LOCK_CSR,
600 port->host_deviceid);
603 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
605 "RIO: PE locked by a higher priority host...retreating\n");
609 /* Setup new RIO device */
610 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
614 if (prev && rio_is_switch(prev))
615 prev->rswitch->nextdev[prev_port] = rdev;
619 if (rio_is_switch(rdev)) {
626 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
627 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
628 port->host_deviceid, sw_inport, 0);
629 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
631 destid = rio_destid_first(net);
632 while (destid != RIO_INVALID_DESTID && destid < next_destid) {
633 if (destid != port->host_deviceid) {
634 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
635 destid, sw_inport, 0);
636 rdev->rswitch->route_table[destid] = sw_inport;
638 destid = rio_destid_next(net, destid + 1);
641 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
642 rio_name(rdev), rdev->vid, rdev->did,
643 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
644 sw_destid = next_destid;
646 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
648 if (sw_inport == port_num) {
649 rio_enable_rx_tx_port(port, 0,
650 RIO_ANY_DESTID(port->sys_size),
652 rdev->rswitch->port_ok |= (1 << port_num);
656 cur_destid = next_destid;
658 if (rio_sport_is_active
659 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
662 "RIO: scanning device on port %d\n",
664 rio_enable_rx_tx_port(port, 0,
665 RIO_ANY_DESTID(port->sys_size),
667 rdev->rswitch->port_ok |= (1 << port_num);
668 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
669 RIO_ANY_DESTID(port->sys_size),
672 if (rio_enum_peer(net, port, hopcount + 1,
676 /* Update routing tables */
677 destid = rio_destid_next(net, cur_destid + 1);
678 if (destid != RIO_INVALID_DESTID) {
679 for (destid = cur_destid;
680 destid < next_destid;) {
681 if (destid != port->host_deviceid) {
682 rio_route_add_entry(rdev,
688 route_table[destid] =
691 destid = rio_destid_next(net,
696 /* If switch supports Error Management,
697 * set PORT_LOCKOUT bit for unused port
700 rio_set_port_lockout(rdev, port_num, 1);
702 rdev->rswitch->port_ok &= ~(1 << port_num);
706 /* Direct Port-write messages to the enumeratiing host */
707 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
709 rio_write_config_32(rdev,
710 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
711 (port->host_deviceid << 16) |
712 (port->sys_size << 15));
717 /* Check for empty switch */
718 if (next_destid == sw_destid)
719 next_destid = rio_destid_alloc(net);
721 rdev->destid = sw_destid;
723 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
724 rio_name(rdev), rdev->vid, rdev->did);
730 * rio_enum_complete- Tests if enumeration of a network is complete
731 * @port: Master port to send transaction
733 * Tests the PGCCSR discovered bit for non-zero value (enumeration
734 * complete flag). Return %1 if enumeration is complete or %0 if
735 * enumeration is incomplete.
737 static int rio_enum_complete(struct rio_mport *port)
741 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
743 return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
747 * rio_disc_peer- Recursively discovers a RIO network through a master port
748 * @net: RIO network being discovered
749 * @port: Master port to send transactions
750 * @destid: Current destination ID in network
751 * @hopcount: Number of hops into the network
752 * @prev: previous rio_dev
753 * @prev_port: previous port number
755 * Recursively discovers a RIO network. Transactions are sent via the
756 * master port passed in @port.
759 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
760 u8 hopcount, struct rio_dev *prev, int prev_port)
762 u8 port_num, route_port;
763 struct rio_dev *rdev;
766 /* Setup new RIO device */
767 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
769 if (prev && rio_is_switch(prev))
770 prev->rswitch->nextdev[prev_port] = rdev;
774 if (rio_is_switch(rdev)) {
775 /* Associated destid is how we accessed this switch */
776 rdev->destid = destid;
779 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
780 rio_name(rdev), rdev->vid, rdev->did,
781 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
783 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
785 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
788 if (rio_sport_is_active
789 (port, destid, hopcount, port_num)) {
791 "RIO: scanning device on port %d\n",
794 rio_lock_device(port, destid, hopcount, 1000);
797 ndestid < RIO_ANY_DESTID(port->sys_size);
799 rio_route_get_entry(rdev,
803 if (route_port == port_num)
807 if (ndestid == RIO_ANY_DESTID(port->sys_size))
809 rio_unlock_device(port, destid, hopcount);
810 if (rio_disc_peer(net, port, ndestid,
811 hopcount + 1, rdev, port_num) < 0)
816 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
817 rio_name(rdev), rdev->vid, rdev->did);
823 * rio_mport_is_active- Tests if master port link is active
824 * @port: Master port to test
826 * Reads the port error status CSR for the master port to
827 * determine if the port has an active link. Returns
828 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
829 * or %0 if it is inactive.
831 static int rio_mport_is_active(struct rio_mport *port)
835 int *entry = rio_mport_phys_table;
839 rio_mport_get_feature(port, 1, 0, 0, *entry)))
841 } while (*++entry >= 0);
844 rio_local_read_config_32(port,
846 RIO_PORT_N_ERR_STS_CSR(port->index),
849 return result & RIO_PORT_N_ERR_STS_PORT_OK;
852 static void rio_scan_release_net(struct rio_net *net)
854 pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
855 kfree(net->enum_data);
858 static void rio_scan_release_dev(struct device *dev)
862 net = to_rio_net(dev);
863 pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
868 * rio_scan_alloc_net - Allocate and configure a new RIO network
869 * @mport: Master port associated with the RIO network
870 * @do_enum: Enumeration/Discovery mode flag
871 * @start: logical minimal start id for new net
873 * Allocates a new RIO network structure and initializes enumerator-specific
874 * part of it (if required).
875 * Returns a RIO network pointer on success or %NULL on failure.
877 static struct rio_net *rio_scan_alloc_net(struct rio_mport *mport,
878 int do_enum, u16 start)
882 net = rio_alloc_net(mport);
884 if (net && do_enum) {
885 struct rio_id_table *idtab;
888 size = sizeof(struct rio_id_table) +
890 RIO_MAX_ROUTE_ENTRIES(mport->sys_size)
893 idtab = kzalloc(size, GFP_KERNEL);
896 pr_err("RIO: failed to allocate destID table\n");
900 net->enum_data = idtab;
901 net->release = rio_scan_release_net;
902 idtab->start = start;
903 idtab->max = RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
904 spin_lock_init(&idtab->lock);
911 dev_set_name(&net->dev, "rnet_%d", net->id);
912 net->dev.parent = &mport->dev;
913 net->dev.release = rio_scan_release_dev;
921 * rio_update_route_tables- Updates route tables in switches
922 * @net: RIO network to run update on
924 * For each enumerated device, ensure that each switch in a system
925 * has correct routing entries. Add routes for devices that where
926 * unknown dirung the first enumeration pass through the switch.
928 static void rio_update_route_tables(struct rio_net *net)
930 struct rio_dev *rdev, *swrdev;
931 struct rio_switch *rswitch;
935 list_for_each_entry(rdev, &net->devices, net_list) {
937 destid = rdev->destid;
939 list_for_each_entry(rswitch, &net->switches, node) {
941 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
944 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
945 swrdev = sw_to_rio_dev(rswitch);
947 /* Skip if destid ends in empty switch*/
948 if (swrdev->destid == destid)
951 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
953 rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE,
955 rswitch->route_table[destid] = sport;
962 * rio_init_em - Initializes RIO Error Management (for switches)
965 * For each enumerated switch, call device-specific error management
966 * initialization routine (if supplied by the switch driver).
968 static void rio_init_em(struct rio_dev *rdev)
970 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
971 rdev->rswitch->ops && rdev->rswitch->ops->em_init) {
972 rdev->rswitch->ops->em_init(rdev);
977 * rio_enum_mport- Start enumeration through a master port
978 * @mport: Master port to send transactions
979 * @flags: Enumeration control flags
981 * Starts the enumeration process. If somebody has enumerated our
982 * master port device, then give up. If not and we have an active
983 * link, then start recursive peer enumeration. Returns %0 if
984 * enumeration succeeds or %-EBUSY if enumeration fails.
986 static int rio_enum_mport(struct rio_mport *mport, u32 flags)
988 struct rio_net *net = NULL;
991 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
995 * To avoid multiple start requests (repeat enumeration is not supported
996 * by this method) check if enumeration/discovery was performed for this
997 * mport: if mport was added into the list of mports for a net exit
1000 if (mport->nnode.next || mport->nnode.prev)
1003 /* If somebody else enumerated our master port device, bail. */
1004 if (rio_enum_host(mport) < 0) {
1006 "RIO: master port %d device has been enumerated by a remote host\n",
1012 /* If master port has an active link, allocate net and enum peers */
1013 if (rio_mport_is_active(mport)) {
1014 net = rio_scan_alloc_net(mport, 1, 0);
1016 printk(KERN_ERR "RIO: failed to allocate new net\n");
1021 /* reserve mport destID in new net */
1022 rio_destid_reserve(net, mport->host_deviceid);
1024 /* Enable Input Output Port (transmitter reviever) */
1025 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1027 /* Set component tag for host */
1028 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1031 next_destid = rio_destid_alloc(net);
1033 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1034 /* A higher priority host won enumeration, bail. */
1036 "RIO: master port %d device has lost enumeration to a remote host\n",
1038 rio_clear_locks(net);
1042 /* free the last allocated destID (unused) */
1043 rio_destid_free(net, next_destid);
1044 rio_update_route_tables(net);
1045 rio_clear_locks(net);
1046 rio_pw_enable(mport, 1);
1048 printk(KERN_INFO "RIO: master port %d link inactive\n",
1058 * rio_build_route_tables- Generate route tables from switch route entries
1059 * @net: RIO network to run route tables scan on
1061 * For each switch device, generate a route table by copying existing
1062 * route entries from the switch.
1064 static void rio_build_route_tables(struct rio_net *net)
1066 struct rio_switch *rswitch;
1067 struct rio_dev *rdev;
1071 list_for_each_entry(rswitch, &net->switches, node) {
1072 rdev = sw_to_rio_dev(rswitch);
1074 rio_lock_device(net->hport, rdev->destid,
1075 rdev->hopcount, 1000);
1077 i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
1079 if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
1082 rswitch->route_table[i] = sport;
1085 rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
1090 * rio_disc_mport- Start discovery through a master port
1091 * @mport: Master port to send transactions
1092 * @flags: discovery control flags
1094 * Starts the discovery process. If we have an active link,
1095 * then wait for the signal that enumeration is complete (if wait
1097 * When enumeration completion is signaled, start recursive
1098 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1101 static int rio_disc_mport(struct rio_mport *mport, u32 flags)
1103 struct rio_net *net = NULL;
1104 unsigned long to_end;
1106 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1109 /* If master port has an active link, allocate net and discover peers */
1110 if (rio_mport_is_active(mport)) {
1111 if (rio_enum_complete(mport))
1113 else if (flags & RIO_SCAN_ENUM_NO_WAIT)
1116 pr_debug("RIO: wait for enumeration to complete...\n");
1118 to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1119 while (time_before(jiffies, to_end)) {
1120 if (rio_enum_complete(mport))
1125 pr_debug("RIO: discovery timeout on mport %d %s\n",
1126 mport->id, mport->name);
1129 pr_debug("RIO: ... enumeration done\n");
1131 net = rio_scan_alloc_net(mport, 0, 0);
1133 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1137 /* Read DestID assigned by enumerator */
1138 rio_local_read_config_32(mport, RIO_DID_CSR,
1139 &mport->host_deviceid);
1140 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1141 mport->host_deviceid);
1143 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1146 "RIO: master port %d device has failed discovery\n",
1151 rio_build_route_tables(net);
1159 static struct rio_scan rio_scan_ops = {
1160 .owner = THIS_MODULE,
1161 .enumerate = rio_enum_mport,
1162 .discover = rio_disc_mport,
1166 module_param(scan, bool, 0);
1167 MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery "
1173 * When this enumeration/discovery method is loaded as a module this function
1174 * registers its specific enumeration and discover routines for all available
1175 * RapidIO mport devices. The "scan" command line parameter controls ability of
1176 * the module to start RapidIO enumeration/discovery automatically.
1178 * Returns 0 for success or -EIO if unable to register itself.
1180 * This enumeration/discovery method cannot be unloaded and therefore does not
1181 * provide a matching cleanup_module routine.
1184 static int __init rio_basic_attach(void)
1186 if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops))
1193 late_initcall(rio_basic_attach);
1195 MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
1196 MODULE_LICENSE("GPL");