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_local_set_device_id - Set the base/extended device id for a port
198 * @port: RIO master port
199 * @did: Device ID value to be written
201 * Writes the base/extended device id from a device.
203 static void rio_local_set_device_id(struct rio_mport *port, u16 did)
205 rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
210 * rio_clear_locks- Release all host locks and signal enumeration complete
211 * @net: RIO network to run on
213 * Marks the component tag CSR on each device with the enumeration
214 * complete flag. When complete, it then release the host locks on
215 * each device. Returns 0 on success or %-EINVAL on failure.
217 static int rio_clear_locks(struct rio_net *net)
219 struct rio_mport *port = net->hport;
220 struct rio_dev *rdev;
224 /* Release host device id locks */
225 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
226 port->host_deviceid);
227 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
228 if ((result & 0xffff) != 0xffff) {
230 "RIO: badness when releasing host lock on master port, result %8.8x\n",
234 list_for_each_entry(rdev, &net->devices, net_list) {
235 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
236 port->host_deviceid);
237 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
238 if ((result & 0xffff) != 0xffff) {
240 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
241 rdev->vid, rdev->did);
245 /* Mark device as discovered and enable master */
246 rio_read_config_32(rdev,
247 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
249 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
250 rio_write_config_32(rdev,
251 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
259 * rio_enum_host- Set host lock and initialize host destination ID
260 * @port: Master port to issue transaction
262 * Sets the local host master port lock and destination ID register
263 * with the host device ID value. The host device ID value is provided
264 * by the platform. Returns %0 on success or %-1 on failure.
266 static int rio_enum_host(struct rio_mport *port)
270 /* Set master port host device id lock */
271 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
272 port->host_deviceid);
274 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
275 if ((result & 0xffff) != port->host_deviceid)
278 /* Set master port destid and init destid ctr */
279 rio_local_set_device_id(port, port->host_deviceid);
284 * rio_device_has_destid- Test if a device contains a destination ID register
285 * @port: Master port to issue transaction
286 * @src_ops: RIO device source operations
287 * @dst_ops: RIO device destination operations
289 * Checks the provided @src_ops and @dst_ops for the necessary transaction
290 * capabilities that indicate whether or not a device will implement a
291 * destination ID register. Returns 1 if true or 0 if false.
293 static int rio_device_has_destid(struct rio_mport *port, int src_ops,
296 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;
298 return !!((src_ops | dst_ops) & mask);
302 * rio_release_dev- Frees a RIO device struct
303 * @dev: LDM device associated with a RIO device struct
305 * Gets the RIO device struct associated a RIO device struct.
306 * The RIO device struct is freed.
308 static void rio_release_dev(struct device *dev)
310 struct rio_dev *rdev;
312 rdev = to_rio_dev(dev);
317 * rio_is_switch- Tests if a RIO device has switch capabilities
320 * Gets the RIO device Processing Element Features register
321 * contents and tests for switch capabilities. Returns 1 if
322 * the device is a switch or 0 if it is not a switch.
323 * The RIO device struct is freed.
325 static int rio_is_switch(struct rio_dev *rdev)
327 if (rdev->pef & RIO_PEF_SWITCH)
333 * rio_setup_device- Allocates and sets up a RIO device
335 * @port: Master port to send transactions
336 * @destid: Current destination ID
337 * @hopcount: Current hopcount
338 * @do_enum: Enumeration/Discovery mode flag
340 * Allocates a RIO device and configures fields based on configuration
341 * space contents. If device has a destination ID register, a destination
342 * ID is either assigned in enumeration mode or read from configuration
343 * space in discovery mode. If the device has switch capabilities, then
344 * a switch is allocated and configured appropriately. Returns a pointer
345 * to a RIO device on success or NULL on failure.
348 static struct rio_dev *rio_setup_device(struct rio_net *net,
349 struct rio_mport *port, u16 destid,
350 u8 hopcount, int do_enum)
353 struct rio_dev *rdev;
354 struct rio_switch *rswitch = NULL;
359 size = sizeof(struct rio_dev);
360 if (rio_mport_read_config_32(port, destid, hopcount,
361 RIO_PEF_CAR, &result))
364 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
365 rio_mport_read_config_32(port, destid, hopcount,
366 RIO_SWP_INFO_CAR, &swpinfo);
367 if (result & RIO_PEF_SWITCH) {
368 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
369 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
373 rdev = kzalloc(size, GFP_KERNEL);
379 rdev->swpinfo = swpinfo;
380 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
382 rdev->did = result >> 16;
383 rdev->vid = result & 0xffff;
384 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
386 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
388 rdev->asm_did = result >> 16;
389 rdev->asm_vid = result & 0xffff;
390 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
392 rdev->asm_rev = result >> 16;
393 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
394 rdev->efptr = result & 0xffff;
395 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
398 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
399 hopcount, RIO_EFB_ERR_MGMNT);
402 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
404 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
408 /* Assign component tag to device */
409 if (next_comptag >= 0x10000) {
410 pr_err("RIO: Component Tag Counter Overflow\n");
413 rio_mport_write_config_32(port, destid, hopcount,
414 RIO_COMPONENT_TAG_CSR, next_comptag);
415 rdev->comp_tag = next_comptag++;
416 rdev->do_enum = true;
418 rio_mport_read_config_32(port, destid, hopcount,
419 RIO_COMPONENT_TAG_CSR,
423 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
425 rio_set_device_id(port, destid, hopcount, next_destid);
426 rdev->destid = next_destid;
427 next_destid = rio_destid_alloc(net);
429 rdev->destid = rio_get_device_id(port, destid, hopcount);
431 rdev->hopcount = 0xff;
433 /* Switch device has an associated destID which
434 * will be adjusted later
436 rdev->destid = destid;
437 rdev->hopcount = hopcount;
440 /* If a PE has both switch and other functions, show it as a switch */
441 if (rio_is_switch(rdev)) {
442 rswitch = rdev->rswitch;
443 rswitch->port_ok = 0;
444 spin_lock_init(&rswitch->lock);
445 rswitch->route_table = kzalloc(sizeof(u8)*
446 RIO_MAX_ROUTE_ENTRIES(port->sys_size),
448 if (!rswitch->route_table)
450 /* Initialize switch route table */
451 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
453 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
454 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
455 rdev->comp_tag & RIO_CTAG_UDEVID);
458 rio_route_clr_table(rdev, RIO_GLOBAL_TABLE, 0);
461 /*Enable Input Output Port (transmitter reviever)*/
462 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
464 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
465 rdev->comp_tag & RIO_CTAG_UDEVID);
468 rdev->dev.parent = &net->dev;
469 rio_attach_device(rdev);
470 rdev->dev.release = rio_release_dev;
471 rdev->dma_mask = DMA_BIT_MASK(32);
472 rdev->dev.dma_mask = &rdev->dma_mask;
473 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
475 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
476 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
479 ret = rio_add_device(rdev);
489 kfree(rswitch->route_table);
496 * rio_sport_is_active- Tests if a switch port has an active connection.
497 * @port: Master port to send transaction
498 * @destid: Associated destination ID for switch
499 * @hopcount: Hopcount to reach switch
500 * @sport: Switch port number
502 * Reads the port error status CSR for a particular switch port to
503 * determine if the port has an active link. Returns
504 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
508 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
513 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
515 while (ext_ftr_ptr) {
516 rio_mport_read_config_32(port, destid, hopcount,
517 ext_ftr_ptr, &result);
518 result = RIO_GET_BLOCK_ID(result);
519 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
520 (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
521 (result == RIO_EFB_SER_EP_FREC_ID))
524 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
529 rio_mport_read_config_32(port, destid, hopcount,
531 RIO_PORT_N_ERR_STS_CSR(sport),
534 return result & RIO_PORT_N_ERR_STS_PORT_OK;
538 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
539 * @port: Master port to send transaction
540 * @hopcount: Number of hops to the device
542 * Used during enumeration to read the Host Device ID Lock CSR on a
543 * RIO device. Returns the value of the lock register.
545 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
549 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
550 RIO_HOST_DID_LOCK_CSR, &result);
552 return (u16) (result & 0xffff);
556 * rio_enum_peer- Recursively enumerate a RIO network through a master port
557 * @net: RIO network being enumerated
558 * @port: Master port to send transactions
559 * @hopcount: Number of hops into the network
560 * @prev: Previous RIO device connected to the enumerated one
561 * @prev_port: Port on previous RIO device
563 * Recursively enumerates a RIO network. Transactions are sent via the
564 * master port passed in @port.
566 static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
567 u8 hopcount, struct rio_dev *prev, int prev_port)
569 struct rio_dev *rdev;
573 if (rio_mport_chk_dev_access(port,
574 RIO_ANY_DESTID(port->sys_size), hopcount)) {
575 pr_debug("RIO: device access check failed\n");
579 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
580 pr_debug("RIO: PE already discovered by this host\n");
582 * Already discovered by this host. Add it as another
583 * link to the existing device.
585 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
586 hopcount, RIO_COMPONENT_TAG_CSR, ®val);
589 rdev = rio_get_comptag((regval & 0xffff), NULL);
591 if (rdev && prev && rio_is_switch(prev)) {
592 pr_debug("RIO: redundant path to %s\n",
594 prev->rswitch->nextdev[prev_port] = rdev;
601 /* Attempt to acquire device lock */
602 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
604 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
605 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
606 < port->host_deviceid) {
609 /* Attempt to acquire device lock again */
610 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
612 RIO_HOST_DID_LOCK_CSR,
613 port->host_deviceid);
616 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
618 "RIO: PE locked by a higher priority host...retreating\n");
622 /* Setup new RIO device */
623 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
627 if (prev && rio_is_switch(prev))
628 prev->rswitch->nextdev[prev_port] = rdev;
632 if (rio_is_switch(rdev)) {
639 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
640 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
641 port->host_deviceid, sw_inport, 0);
642 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
644 destid = rio_destid_first(net);
645 while (destid != RIO_INVALID_DESTID && destid < next_destid) {
646 if (destid != port->host_deviceid) {
647 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
648 destid, sw_inport, 0);
649 rdev->rswitch->route_table[destid] = sw_inport;
651 destid = rio_destid_next(net, destid + 1);
654 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
655 rio_name(rdev), rdev->vid, rdev->did,
656 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
657 sw_destid = next_destid;
659 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
661 if (sw_inport == port_num) {
662 rio_enable_rx_tx_port(port, 0,
663 RIO_ANY_DESTID(port->sys_size),
665 rdev->rswitch->port_ok |= (1 << port_num);
669 cur_destid = next_destid;
671 if (rio_sport_is_active
672 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
675 "RIO: scanning device on port %d\n",
677 rio_enable_rx_tx_port(port, 0,
678 RIO_ANY_DESTID(port->sys_size),
680 rdev->rswitch->port_ok |= (1 << port_num);
681 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
682 RIO_ANY_DESTID(port->sys_size),
685 if (rio_enum_peer(net, port, hopcount + 1,
689 /* Update routing tables */
690 destid = rio_destid_next(net, cur_destid + 1);
691 if (destid != RIO_INVALID_DESTID) {
692 for (destid = cur_destid;
693 destid < next_destid;) {
694 if (destid != port->host_deviceid) {
695 rio_route_add_entry(rdev,
701 route_table[destid] =
704 destid = rio_destid_next(net,
709 /* If switch supports Error Management,
710 * set PORT_LOCKOUT bit for unused port
713 rio_set_port_lockout(rdev, port_num, 1);
715 rdev->rswitch->port_ok &= ~(1 << port_num);
719 /* Direct Port-write messages to the enumeratiing host */
720 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
722 rio_write_config_32(rdev,
723 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
724 (port->host_deviceid << 16) |
725 (port->sys_size << 15));
730 /* Check for empty switch */
731 if (next_destid == sw_destid)
732 next_destid = rio_destid_alloc(net);
734 rdev->destid = sw_destid;
736 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
737 rio_name(rdev), rdev->vid, rdev->did);
743 * rio_enum_complete- Tests if enumeration of a network is complete
744 * @port: Master port to send transaction
746 * Tests the PGCCSR discovered bit for non-zero value (enumeration
747 * complete flag). Return %1 if enumeration is complete or %0 if
748 * enumeration is incomplete.
750 static int rio_enum_complete(struct rio_mport *port)
754 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
756 return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
760 * rio_disc_peer- Recursively discovers a RIO network through a master port
761 * @net: RIO network being discovered
762 * @port: Master port to send transactions
763 * @destid: Current destination ID in network
764 * @hopcount: Number of hops into the network
765 * @prev: previous rio_dev
766 * @prev_port: previous port number
768 * Recursively discovers a RIO network. Transactions are sent via the
769 * master port passed in @port.
772 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
773 u8 hopcount, struct rio_dev *prev, int prev_port)
775 u8 port_num, route_port;
776 struct rio_dev *rdev;
779 /* Setup new RIO device */
780 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
782 if (prev && rio_is_switch(prev))
783 prev->rswitch->nextdev[prev_port] = rdev;
787 if (rio_is_switch(rdev)) {
788 /* Associated destid is how we accessed this switch */
789 rdev->destid = destid;
792 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
793 rio_name(rdev), rdev->vid, rdev->did,
794 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
796 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
798 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
801 if (rio_sport_is_active
802 (port, destid, hopcount, port_num)) {
804 "RIO: scanning device on port %d\n",
807 rio_lock_device(port, destid, hopcount, 1000);
810 ndestid < RIO_ANY_DESTID(port->sys_size);
812 rio_route_get_entry(rdev,
816 if (route_port == port_num)
820 if (ndestid == RIO_ANY_DESTID(port->sys_size))
822 rio_unlock_device(port, destid, hopcount);
823 if (rio_disc_peer(net, port, ndestid,
824 hopcount + 1, rdev, port_num) < 0)
829 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
830 rio_name(rdev), rdev->vid, rdev->did);
836 * rio_mport_is_active- Tests if master port link is active
837 * @port: Master port to test
839 * Reads the port error status CSR for the master port to
840 * determine if the port has an active link. Returns
841 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
842 * or %0 if it is inactive.
844 static int rio_mport_is_active(struct rio_mport *port)
848 int *entry = rio_mport_phys_table;
852 rio_mport_get_feature(port, 1, 0, 0, *entry)))
854 } while (*++entry >= 0);
857 rio_local_read_config_32(port,
859 RIO_PORT_N_ERR_STS_CSR(port->index),
862 return result & RIO_PORT_N_ERR_STS_PORT_OK;
865 static void rio_scan_release_net(struct rio_net *net)
867 pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
868 kfree(net->enum_data);
871 static void rio_scan_release_dev(struct device *dev)
875 net = to_rio_net(dev);
876 pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
881 * rio_scan_alloc_net - Allocate and configure a new RIO network
882 * @mport: Master port associated with the RIO network
883 * @do_enum: Enumeration/Discovery mode flag
884 * @start: logical minimal start id for new net
886 * Allocates a new RIO network structure and initializes enumerator-specific
887 * part of it (if required).
888 * Returns a RIO network pointer on success or %NULL on failure.
890 static struct rio_net *rio_scan_alloc_net(struct rio_mport *mport,
891 int do_enum, u16 start)
895 net = rio_alloc_net(mport);
897 if (net && do_enum) {
898 struct rio_id_table *idtab;
901 size = sizeof(struct rio_id_table) +
903 RIO_MAX_ROUTE_ENTRIES(mport->sys_size)
906 idtab = kzalloc(size, GFP_KERNEL);
909 pr_err("RIO: failed to allocate destID table\n");
913 net->enum_data = idtab;
914 net->release = rio_scan_release_net;
915 idtab->start = start;
916 idtab->max = RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
917 spin_lock_init(&idtab->lock);
924 dev_set_name(&net->dev, "rnet_%d", net->id);
925 net->dev.parent = &mport->dev;
926 net->dev.release = rio_scan_release_dev;
934 * rio_update_route_tables- Updates route tables in switches
935 * @net: RIO network to run update on
937 * For each enumerated device, ensure that each switch in a system
938 * has correct routing entries. Add routes for devices that where
939 * unknown dirung the first enumeration pass through the switch.
941 static void rio_update_route_tables(struct rio_net *net)
943 struct rio_dev *rdev, *swrdev;
944 struct rio_switch *rswitch;
948 list_for_each_entry(rdev, &net->devices, net_list) {
950 destid = rdev->destid;
952 list_for_each_entry(rswitch, &net->switches, node) {
954 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
957 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
958 swrdev = sw_to_rio_dev(rswitch);
960 /* Skip if destid ends in empty switch*/
961 if (swrdev->destid == destid)
964 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
966 rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE,
968 rswitch->route_table[destid] = sport;
975 * rio_init_em - Initializes RIO Error Management (for switches)
978 * For each enumerated switch, call device-specific error management
979 * initialization routine (if supplied by the switch driver).
981 static void rio_init_em(struct rio_dev *rdev)
983 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
984 rdev->rswitch->ops && rdev->rswitch->ops->em_init) {
985 rdev->rswitch->ops->em_init(rdev);
990 * rio_pw_enable - Enables/disables port-write handling by a master port
991 * @port: Master port associated with port-write handling
992 * @enable: 1=enable, 0=disable
994 static void rio_pw_enable(struct rio_mport *port, int enable)
996 if (port->ops->pwenable)
997 port->ops->pwenable(port, enable);
1001 * rio_enum_mport- Start enumeration through a master port
1002 * @mport: Master port to send transactions
1003 * @flags: Enumeration control flags
1005 * Starts the enumeration process. If somebody has enumerated our
1006 * master port device, then give up. If not and we have an active
1007 * link, then start recursive peer enumeration. Returns %0 if
1008 * enumeration succeeds or %-EBUSY if enumeration fails.
1010 static int rio_enum_mport(struct rio_mport *mport, u32 flags)
1012 struct rio_net *net = NULL;
1015 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1019 * To avoid multiple start requests (repeat enumeration is not supported
1020 * by this method) check if enumeration/discovery was performed for this
1021 * mport: if mport was added into the list of mports for a net exit
1024 if (mport->nnode.next || mport->nnode.prev)
1027 /* If somebody else enumerated our master port device, bail. */
1028 if (rio_enum_host(mport) < 0) {
1030 "RIO: master port %d device has been enumerated by a remote host\n",
1036 /* If master port has an active link, allocate net and enum peers */
1037 if (rio_mport_is_active(mport)) {
1038 net = rio_scan_alloc_net(mport, 1, 0);
1040 printk(KERN_ERR "RIO: failed to allocate new net\n");
1045 /* reserve mport destID in new net */
1046 rio_destid_reserve(net, mport->host_deviceid);
1048 /* Enable Input Output Port (transmitter reviever) */
1049 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1051 /* Set component tag for host */
1052 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1055 next_destid = rio_destid_alloc(net);
1057 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1058 /* A higher priority host won enumeration, bail. */
1060 "RIO: master port %d device has lost enumeration to a remote host\n",
1062 rio_clear_locks(net);
1066 /* free the last allocated destID (unused) */
1067 rio_destid_free(net, next_destid);
1068 rio_update_route_tables(net);
1069 rio_clear_locks(net);
1070 rio_pw_enable(mport, 1);
1072 printk(KERN_INFO "RIO: master port %d link inactive\n",
1082 * rio_build_route_tables- Generate route tables from switch route entries
1083 * @net: RIO network to run route tables scan on
1085 * For each switch device, generate a route table by copying existing
1086 * route entries from the switch.
1088 static void rio_build_route_tables(struct rio_net *net)
1090 struct rio_switch *rswitch;
1091 struct rio_dev *rdev;
1095 list_for_each_entry(rswitch, &net->switches, node) {
1096 rdev = sw_to_rio_dev(rswitch);
1098 rio_lock_device(net->hport, rdev->destid,
1099 rdev->hopcount, 1000);
1101 i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
1103 if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
1106 rswitch->route_table[i] = sport;
1109 rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
1114 * rio_disc_mport- Start discovery through a master port
1115 * @mport: Master port to send transactions
1116 * @flags: discovery control flags
1118 * Starts the discovery process. If we have an active link,
1119 * then wait for the signal that enumeration is complete (if wait
1121 * When enumeration completion is signaled, start recursive
1122 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1125 static int rio_disc_mport(struct rio_mport *mport, u32 flags)
1127 struct rio_net *net = NULL;
1128 unsigned long to_end;
1130 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1133 /* If master port has an active link, allocate net and discover peers */
1134 if (rio_mport_is_active(mport)) {
1135 if (rio_enum_complete(mport))
1137 else if (flags & RIO_SCAN_ENUM_NO_WAIT)
1140 pr_debug("RIO: wait for enumeration to complete...\n");
1142 to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1143 while (time_before(jiffies, to_end)) {
1144 if (rio_enum_complete(mport))
1149 pr_debug("RIO: discovery timeout on mport %d %s\n",
1150 mport->id, mport->name);
1153 pr_debug("RIO: ... enumeration done\n");
1155 net = rio_scan_alloc_net(mport, 0, 0);
1157 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1161 /* Read DestID assigned by enumerator */
1162 rio_local_read_config_32(mport, RIO_DID_CSR,
1163 &mport->host_deviceid);
1164 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1165 mport->host_deviceid);
1167 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1170 "RIO: master port %d device has failed discovery\n",
1175 rio_build_route_tables(net);
1183 static struct rio_scan rio_scan_ops = {
1184 .owner = THIS_MODULE,
1185 .enumerate = rio_enum_mport,
1186 .discover = rio_disc_mport,
1190 module_param(scan, bool, 0);
1191 MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery "
1197 * When this enumeration/discovery method is loaded as a module this function
1198 * registers its specific enumeration and discover routines for all available
1199 * RapidIO mport devices. The "scan" command line parameter controls ability of
1200 * the module to start RapidIO enumeration/discovery automatically.
1202 * Returns 0 for success or -EIO if unable to register itself.
1204 * This enumeration/discovery method cannot be unloaded and therefore does not
1205 * provide a matching cleanup_module routine.
1208 static int __init rio_basic_attach(void)
1210 if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops))
1217 late_initcall(rio_basic_attach);
1219 MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
1220 MODULE_LICENSE("GPL");