1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * RapidIO enumeration and discovery support
5 * Copyright 2005 MontaVista Software, Inc.
6 * Matt Porter <mporter@kernel.crashing.org>
8 * Copyright 2009 Integrated Device Technology, Inc.
9 * Alex Bounine <alexandre.bounine@idt.com>
10 * - Added Port-Write/Error Management initialization and handling
12 * Copyright 2009 Sysgo AG
13 * Thomas Moll <thomas.moll@sysgo.com>
14 * - Added Input- Output- enable functionality, to allow full communication
17 #include <linux/types.h>
18 #include <linux/kernel.h>
20 #include <linux/delay.h>
21 #include <linux/dma-mapping.h>
22 #include <linux/init.h>
23 #include <linux/rio.h>
24 #include <linux/rio_drv.h>
25 #include <linux/rio_ids.h>
26 #include <linux/rio_regs.h>
27 #include <linux/module.h>
28 #include <linux/spinlock.h>
29 #include <linux/timer.h>
30 #include <linux/sched.h>
31 #include <linux/jiffies.h>
32 #include <linux/slab.h>
36 static void rio_init_em(struct rio_dev *rdev);
39 u16 start; /* logical minimal id */
40 u32 max; /* max number of IDs in table */
42 unsigned long table[0];
45 static int next_destid = 0;
46 static int next_comptag = 1;
49 * rio_destid_alloc - Allocate next available destID for given network
52 * Returns next available device destination ID for the specified RIO network.
53 * Marks allocated ID as one in use.
54 * Returns RIO_INVALID_DESTID if new destID is not available.
56 static u16 rio_destid_alloc(struct rio_net *net)
59 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
61 spin_lock(&idtab->lock);
62 destid = find_first_zero_bit(idtab->table, idtab->max);
64 if (destid < idtab->max) {
65 set_bit(destid, idtab->table);
66 destid += idtab->start;
68 destid = RIO_INVALID_DESTID;
70 spin_unlock(&idtab->lock);
75 * rio_destid_reserve - Reserve the specified destID
77 * @destid: destID to reserve
79 * Tries to reserve the specified destID.
80 * Returns 0 if successful.
82 static int rio_destid_reserve(struct rio_net *net, u16 destid)
85 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
87 destid -= idtab->start;
88 spin_lock(&idtab->lock);
89 oldbit = test_and_set_bit(destid, idtab->table);
90 spin_unlock(&idtab->lock);
95 * rio_destid_free - free a previously allocated destID
97 * @destid: destID to free
99 * Makes the specified destID available for use.
101 static void rio_destid_free(struct rio_net *net, u16 destid)
103 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
105 destid -= idtab->start;
106 spin_lock(&idtab->lock);
107 clear_bit(destid, idtab->table);
108 spin_unlock(&idtab->lock);
112 * rio_destid_first - return first destID in use
115 static u16 rio_destid_first(struct rio_net *net)
118 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
120 spin_lock(&idtab->lock);
121 destid = find_first_bit(idtab->table, idtab->max);
122 if (destid >= idtab->max)
123 destid = RIO_INVALID_DESTID;
125 destid += idtab->start;
126 spin_unlock(&idtab->lock);
131 * rio_destid_next - return next destID in use
133 * @from: destination ID from which search shall continue
135 static u16 rio_destid_next(struct rio_net *net, u16 from)
138 struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
140 spin_lock(&idtab->lock);
141 destid = find_next_bit(idtab->table, idtab->max, from);
142 if (destid >= idtab->max)
143 destid = RIO_INVALID_DESTID;
145 destid += idtab->start;
146 spin_unlock(&idtab->lock);
151 * rio_get_device_id - Get the base/extended device id for a device
152 * @port: RIO master port
153 * @destid: Destination ID of device
154 * @hopcount: Hopcount to device
156 * Reads the base/extended device id from a device. Returns the
157 * 8/16-bit device ID.
159 static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
163 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
165 return RIO_GET_DID(port->sys_size, result);
169 * rio_set_device_id - Set the base/extended device id for a device
170 * @port: RIO master port
171 * @destid: Destination ID of device
172 * @hopcount: Hopcount to device
173 * @did: Device ID value to be written
175 * Writes the base/extended device id from a device.
177 static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
179 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
180 RIO_SET_DID(port->sys_size, did));
184 * rio_clear_locks- Release all host locks and signal enumeration complete
185 * @net: RIO network to run on
187 * Marks the component tag CSR on each device with the enumeration
188 * complete flag. When complete, it then release the host locks on
189 * each device. Returns 0 on success or %-EINVAL on failure.
191 static int rio_clear_locks(struct rio_net *net)
193 struct rio_mport *port = net->hport;
194 struct rio_dev *rdev;
198 /* Release host device id locks */
199 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
200 port->host_deviceid);
201 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
202 if ((result & 0xffff) != 0xffff) {
204 "RIO: badness when releasing host lock on master port, result %8.8x\n",
208 list_for_each_entry(rdev, &net->devices, net_list) {
209 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
210 port->host_deviceid);
211 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
212 if ((result & 0xffff) != 0xffff) {
214 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
215 rdev->vid, rdev->did);
219 /* Mark device as discovered and enable master */
220 rio_read_config_32(rdev,
221 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
223 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
224 rio_write_config_32(rdev,
225 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
233 * rio_enum_host- Set host lock and initialize host destination ID
234 * @port: Master port to issue transaction
236 * Sets the local host master port lock and destination ID register
237 * with the host device ID value. The host device ID value is provided
238 * by the platform. Returns %0 on success or %-1 on failure.
240 static int rio_enum_host(struct rio_mport *port)
244 /* Set master port host device id lock */
245 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
246 port->host_deviceid);
248 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
249 if ((result & 0xffff) != port->host_deviceid)
252 /* Set master port destid and init destid ctr */
253 rio_local_set_device_id(port, port->host_deviceid);
258 * rio_device_has_destid- Test if a device contains a destination ID register
259 * @port: Master port to issue transaction
260 * @src_ops: RIO device source operations
261 * @dst_ops: RIO device destination operations
263 * Checks the provided @src_ops and @dst_ops for the necessary transaction
264 * capabilities that indicate whether or not a device will implement a
265 * destination ID register. Returns 1 if true or 0 if false.
267 static int rio_device_has_destid(struct rio_mport *port, int src_ops,
270 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;
272 return !!((src_ops | dst_ops) & mask);
276 * rio_release_dev- Frees a RIO device struct
277 * @dev: LDM device associated with a RIO device struct
279 * Gets the RIO device struct associated a RIO device struct.
280 * The RIO device struct is freed.
282 static void rio_release_dev(struct device *dev)
284 struct rio_dev *rdev;
286 rdev = to_rio_dev(dev);
291 * rio_is_switch- Tests if a RIO device has switch capabilities
294 * Gets the RIO device Processing Element Features register
295 * contents and tests for switch capabilities. Returns 1 if
296 * the device is a switch or 0 if it is not a switch.
297 * The RIO device struct is freed.
299 static int rio_is_switch(struct rio_dev *rdev)
301 if (rdev->pef & RIO_PEF_SWITCH)
307 * rio_setup_device- Allocates and sets up a RIO device
309 * @port: Master port to send transactions
310 * @destid: Current destination ID
311 * @hopcount: Current hopcount
312 * @do_enum: Enumeration/Discovery mode flag
314 * Allocates a RIO device and configures fields based on configuration
315 * space contents. If device has a destination ID register, a destination
316 * ID is either assigned in enumeration mode or read from configuration
317 * space in discovery mode. If the device has switch capabilities, then
318 * a switch is allocated and configured appropriately. Returns a pointer
319 * to a RIO device on success or NULL on failure.
322 static struct rio_dev *rio_setup_device(struct rio_net *net,
323 struct rio_mport *port, u16 destid,
324 u8 hopcount, int do_enum)
327 struct rio_dev *rdev;
328 struct rio_switch *rswitch = NULL;
333 size = sizeof(struct rio_dev);
334 if (rio_mport_read_config_32(port, destid, hopcount,
335 RIO_PEF_CAR, &result))
338 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
339 rio_mport_read_config_32(port, destid, hopcount,
340 RIO_SWP_INFO_CAR, &swpinfo);
341 if (result & RIO_PEF_SWITCH) {
342 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
343 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
347 rdev = kzalloc(size, GFP_KERNEL);
353 rdev->swpinfo = swpinfo;
354 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
356 rdev->did = result >> 16;
357 rdev->vid = result & 0xffff;
358 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
360 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
362 rdev->asm_did = result >> 16;
363 rdev->asm_vid = result & 0xffff;
364 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
366 rdev->asm_rev = result >> 16;
367 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
368 rdev->efptr = result & 0xffff;
369 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
370 hopcount, &rdev->phys_rmap);
371 pr_debug("RIO: %s Register Map %d device\n",
372 __func__, rdev->phys_rmap);
374 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
375 hopcount, RIO_EFB_ERR_MGMNT);
377 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
378 hopcount, RIO_EFB_ERR_MGMNT_HS);
381 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
383 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
387 /* Assign component tag to device */
388 if (next_comptag >= 0x10000) {
389 pr_err("RIO: Component Tag Counter Overflow\n");
392 rio_mport_write_config_32(port, destid, hopcount,
393 RIO_COMPONENT_TAG_CSR, next_comptag);
394 rdev->comp_tag = next_comptag++;
395 rdev->do_enum = true;
397 rio_mport_read_config_32(port, destid, hopcount,
398 RIO_COMPONENT_TAG_CSR,
402 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
404 rio_set_device_id(port, destid, hopcount, next_destid);
405 rdev->destid = next_destid;
406 next_destid = rio_destid_alloc(net);
408 rdev->destid = rio_get_device_id(port, destid, hopcount);
410 rdev->hopcount = 0xff;
412 /* Switch device has an associated destID which
413 * will be adjusted later
415 rdev->destid = destid;
416 rdev->hopcount = hopcount;
419 /* If a PE has both switch and other functions, show it as a switch */
420 if (rio_is_switch(rdev)) {
421 rswitch = rdev->rswitch;
422 rswitch->port_ok = 0;
423 spin_lock_init(&rswitch->lock);
424 rswitch->route_table =
425 kzalloc(RIO_MAX_ROUTE_ENTRIES(port->sys_size),
427 if (!rswitch->route_table)
429 /* Initialize switch route table */
430 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
432 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
433 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
434 rdev->comp_tag & RIO_CTAG_UDEVID);
437 rio_route_clr_table(rdev, RIO_GLOBAL_TABLE, 0);
440 /*Enable Input Output Port (transmitter receiver)*/
441 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
443 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
444 rdev->comp_tag & RIO_CTAG_UDEVID);
447 rdev->dev.parent = &net->dev;
448 rio_attach_device(rdev);
449 rdev->dev.release = rio_release_dev;
450 rdev->dma_mask = DMA_BIT_MASK(32);
451 rdev->dev.dma_mask = &rdev->dma_mask;
452 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
454 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
455 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
458 ret = rio_add_device(rdev);
461 kfree(rswitch->route_table);
462 put_device(&rdev->dev);
472 kfree(rswitch->route_table);
479 * rio_sport_is_active- Tests if a switch port has an active connection.
480 * @rdev: RapidIO device object
481 * @sp: Switch port number
483 * Reads the port error status CSR for a particular switch port to
484 * determine if the port has an active link. Returns
485 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
489 rio_sport_is_active(struct rio_dev *rdev, int sp)
493 rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, sp),
496 return result & RIO_PORT_N_ERR_STS_PORT_OK;
500 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
501 * @port: Master port to send transaction
502 * @hopcount: Number of hops to the device
504 * Used during enumeration to read the Host Device ID Lock CSR on a
505 * RIO device. Returns the value of the lock register.
507 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
511 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
512 RIO_HOST_DID_LOCK_CSR, &result);
514 return (u16) (result & 0xffff);
518 * rio_enum_peer- Recursively enumerate a RIO network through a master port
519 * @net: RIO network being enumerated
520 * @port: Master port to send transactions
521 * @hopcount: Number of hops into the network
522 * @prev: Previous RIO device connected to the enumerated one
523 * @prev_port: Port on previous RIO device
525 * Recursively enumerates a RIO network. Transactions are sent via the
526 * master port passed in @port.
528 static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
529 u8 hopcount, struct rio_dev *prev, int prev_port)
531 struct rio_dev *rdev;
535 if (rio_mport_chk_dev_access(port,
536 RIO_ANY_DESTID(port->sys_size), hopcount)) {
537 pr_debug("RIO: device access check failed\n");
541 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
542 pr_debug("RIO: PE already discovered by this host\n");
544 * Already discovered by this host. Add it as another
545 * link to the existing device.
547 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
548 hopcount, RIO_COMPONENT_TAG_CSR, ®val);
551 rdev = rio_get_comptag((regval & 0xffff), NULL);
553 if (rdev && prev && rio_is_switch(prev)) {
554 pr_debug("RIO: redundant path to %s\n",
556 prev->rswitch->nextdev[prev_port] = rdev;
563 /* Attempt to acquire device lock */
564 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
566 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
567 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
568 < port->host_deviceid) {
571 /* Attempt to acquire device lock again */
572 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
574 RIO_HOST_DID_LOCK_CSR,
575 port->host_deviceid);
578 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
580 "RIO: PE locked by a higher priority host...retreating\n");
584 /* Setup new RIO device */
585 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
589 if (prev && rio_is_switch(prev))
590 prev->rswitch->nextdev[prev_port] = rdev;
594 if (rio_is_switch(rdev)) {
601 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
602 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
603 port->host_deviceid, sw_inport, 0);
604 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
606 destid = rio_destid_first(net);
607 while (destid != RIO_INVALID_DESTID && destid < next_destid) {
608 if (destid != port->host_deviceid) {
609 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
610 destid, sw_inport, 0);
611 rdev->rswitch->route_table[destid] = sw_inport;
613 destid = rio_destid_next(net, destid + 1);
616 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
617 rio_name(rdev), rdev->vid, rdev->did,
618 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
619 sw_destid = next_destid;
621 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
623 if (sw_inport == port_num) {
624 rio_enable_rx_tx_port(port, 0,
625 RIO_ANY_DESTID(port->sys_size),
627 rdev->rswitch->port_ok |= (1 << port_num);
631 cur_destid = next_destid;
633 if (rio_sport_is_active(rdev, port_num)) {
635 "RIO: scanning device on port %d\n",
637 rio_enable_rx_tx_port(port, 0,
638 RIO_ANY_DESTID(port->sys_size),
640 rdev->rswitch->port_ok |= (1 << port_num);
641 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
642 RIO_ANY_DESTID(port->sys_size),
645 if (rio_enum_peer(net, port, hopcount + 1,
649 /* Update routing tables */
650 destid = rio_destid_next(net, cur_destid + 1);
651 if (destid != RIO_INVALID_DESTID) {
652 for (destid = cur_destid;
653 destid < next_destid;) {
654 if (destid != port->host_deviceid) {
655 rio_route_add_entry(rdev,
661 route_table[destid] =
664 destid = rio_destid_next(net,
669 /* If switch supports Error Management,
670 * set PORT_LOCKOUT bit for unused port
673 rio_set_port_lockout(rdev, port_num, 1);
675 rdev->rswitch->port_ok &= ~(1 << port_num);
679 /* Direct Port-write messages to the enumeratiing host */
680 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
682 rio_write_config_32(rdev,
683 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
684 (port->host_deviceid << 16) |
685 (port->sys_size << 15));
690 /* Check for empty switch */
691 if (next_destid == sw_destid)
692 next_destid = rio_destid_alloc(net);
694 rdev->destid = sw_destid;
696 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
697 rio_name(rdev), rdev->vid, rdev->did);
703 * rio_enum_complete- Tests if enumeration of a network is complete
704 * @port: Master port to send transaction
706 * Tests the PGCCSR discovered bit for non-zero value (enumeration
707 * complete flag). Return %1 if enumeration is complete or %0 if
708 * enumeration is incomplete.
710 static int rio_enum_complete(struct rio_mport *port)
714 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
716 return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
720 * rio_disc_peer- Recursively discovers a RIO network through a master port
721 * @net: RIO network being discovered
722 * @port: Master port to send transactions
723 * @destid: Current destination ID in network
724 * @hopcount: Number of hops into the network
725 * @prev: previous rio_dev
726 * @prev_port: previous port number
728 * Recursively discovers a RIO network. Transactions are sent via the
729 * master port passed in @port.
732 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
733 u8 hopcount, struct rio_dev *prev, int prev_port)
735 u8 port_num, route_port;
736 struct rio_dev *rdev;
739 /* Setup new RIO device */
740 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
742 if (prev && rio_is_switch(prev))
743 prev->rswitch->nextdev[prev_port] = rdev;
747 if (rio_is_switch(rdev)) {
748 /* Associated destid is how we accessed this switch */
749 rdev->destid = destid;
752 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
753 rio_name(rdev), rdev->vid, rdev->did,
754 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
756 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
758 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
761 if (rio_sport_is_active(rdev, port_num)) {
763 "RIO: scanning device on port %d\n",
766 rio_lock_device(port, destid, hopcount, 1000);
769 ndestid < RIO_ANY_DESTID(port->sys_size);
771 rio_route_get_entry(rdev,
775 if (route_port == port_num)
779 if (ndestid == RIO_ANY_DESTID(port->sys_size))
781 rio_unlock_device(port, destid, hopcount);
782 if (rio_disc_peer(net, port, ndestid,
783 hopcount + 1, rdev, port_num) < 0)
788 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
789 rio_name(rdev), rdev->vid, rdev->did);
795 * rio_mport_is_active- Tests if master port link is active
796 * @port: Master port to test
798 * Reads the port error status CSR for the master port to
799 * determine if the port has an active link. Returns
800 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
801 * or %0 if it is inactive.
803 static int rio_mport_is_active(struct rio_mport *port)
807 rio_local_read_config_32(port,
809 RIO_PORT_N_ERR_STS_CSR(port->index, port->phys_rmap),
811 return result & RIO_PORT_N_ERR_STS_PORT_OK;
814 static void rio_scan_release_net(struct rio_net *net)
816 pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
817 kfree(net->enum_data);
820 static void rio_scan_release_dev(struct device *dev)
824 net = to_rio_net(dev);
825 pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
830 * rio_scan_alloc_net - Allocate and configure a new RIO network
831 * @mport: Master port associated with the RIO network
832 * @do_enum: Enumeration/Discovery mode flag
833 * @start: logical minimal start id for new net
835 * Allocates a new RIO network structure and initializes enumerator-specific
836 * part of it (if required).
837 * Returns a RIO network pointer on success or %NULL on failure.
839 static struct rio_net *rio_scan_alloc_net(struct rio_mport *mport,
840 int do_enum, u16 start)
844 net = rio_alloc_net(mport);
846 if (net && do_enum) {
847 struct rio_id_table *idtab;
850 size = sizeof(struct rio_id_table) +
852 RIO_MAX_ROUTE_ENTRIES(mport->sys_size)
855 idtab = kzalloc(size, GFP_KERNEL);
858 pr_err("RIO: failed to allocate destID table\n");
862 net->enum_data = idtab;
863 net->release = rio_scan_release_net;
864 idtab->start = start;
865 idtab->max = RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
866 spin_lock_init(&idtab->lock);
873 dev_set_name(&net->dev, "rnet_%d", net->id);
874 net->dev.parent = &mport->dev;
875 net->dev.release = rio_scan_release_dev;
883 * rio_update_route_tables- Updates route tables in switches
884 * @net: RIO network to run update on
886 * For each enumerated device, ensure that each switch in a system
887 * has correct routing entries. Add routes for devices that where
888 * unknown during the first enumeration pass through the switch.
890 static void rio_update_route_tables(struct rio_net *net)
892 struct rio_dev *rdev, *swrdev;
893 struct rio_switch *rswitch;
897 list_for_each_entry(rdev, &net->devices, net_list) {
899 destid = rdev->destid;
901 list_for_each_entry(rswitch, &net->switches, node) {
903 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
906 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
907 swrdev = sw_to_rio_dev(rswitch);
909 /* Skip if destid ends in empty switch*/
910 if (swrdev->destid == destid)
913 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
915 rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE,
917 rswitch->route_table[destid] = sport;
924 * rio_init_em - Initializes RIO Error Management (for switches)
927 * For each enumerated switch, call device-specific error management
928 * initialization routine (if supplied by the switch driver).
930 static void rio_init_em(struct rio_dev *rdev)
932 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
933 rdev->rswitch->ops && rdev->rswitch->ops->em_init) {
934 rdev->rswitch->ops->em_init(rdev);
939 * rio_enum_mport- Start enumeration through a master port
940 * @mport: Master port to send transactions
941 * @flags: Enumeration control flags
943 * Starts the enumeration process. If somebody has enumerated our
944 * master port device, then give up. If not and we have an active
945 * link, then start recursive peer enumeration. Returns %0 if
946 * enumeration succeeds or %-EBUSY if enumeration fails.
948 static int rio_enum_mport(struct rio_mport *mport, u32 flags)
950 struct rio_net *net = NULL;
953 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
957 * To avoid multiple start requests (repeat enumeration is not supported
958 * by this method) check if enumeration/discovery was performed for this
959 * mport: if mport was added into the list of mports for a net exit
962 if (mport->nnode.next || mport->nnode.prev)
965 /* If somebody else enumerated our master port device, bail. */
966 if (rio_enum_host(mport) < 0) {
968 "RIO: master port %d device has been enumerated by a remote host\n",
974 /* If master port has an active link, allocate net and enum peers */
975 if (rio_mport_is_active(mport)) {
976 net = rio_scan_alloc_net(mport, 1, 0);
978 printk(KERN_ERR "RIO: failed to allocate new net\n");
983 /* reserve mport destID in new net */
984 rio_destid_reserve(net, mport->host_deviceid);
986 /* Enable Input Output Port (transmitter receiver) */
987 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
989 /* Set component tag for host */
990 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
993 next_destid = rio_destid_alloc(net);
995 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
996 /* A higher priority host won enumeration, bail. */
998 "RIO: master port %d device has lost enumeration to a remote host\n",
1000 rio_clear_locks(net);
1004 /* free the last allocated destID (unused) */
1005 rio_destid_free(net, next_destid);
1006 rio_update_route_tables(net);
1007 rio_clear_locks(net);
1008 rio_pw_enable(mport, 1);
1010 printk(KERN_INFO "RIO: master port %d link inactive\n",
1020 * rio_build_route_tables- Generate route tables from switch route entries
1021 * @net: RIO network to run route tables scan on
1023 * For each switch device, generate a route table by copying existing
1024 * route entries from the switch.
1026 static void rio_build_route_tables(struct rio_net *net)
1028 struct rio_switch *rswitch;
1029 struct rio_dev *rdev;
1033 list_for_each_entry(rswitch, &net->switches, node) {
1034 rdev = sw_to_rio_dev(rswitch);
1036 rio_lock_device(net->hport, rdev->destid,
1037 rdev->hopcount, 1000);
1039 i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
1041 if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
1044 rswitch->route_table[i] = sport;
1047 rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
1052 * rio_disc_mport- Start discovery through a master port
1053 * @mport: Master port to send transactions
1054 * @flags: discovery control flags
1056 * Starts the discovery process. If we have an active link,
1057 * then wait for the signal that enumeration is complete (if wait
1059 * When enumeration completion is signaled, start recursive
1060 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1063 static int rio_disc_mport(struct rio_mport *mport, u32 flags)
1065 struct rio_net *net = NULL;
1066 unsigned long to_end;
1068 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1071 /* If master port has an active link, allocate net and discover peers */
1072 if (rio_mport_is_active(mport)) {
1073 if (rio_enum_complete(mport))
1075 else if (flags & RIO_SCAN_ENUM_NO_WAIT)
1078 pr_debug("RIO: wait for enumeration to complete...\n");
1080 to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1081 while (time_before(jiffies, to_end)) {
1082 if (rio_enum_complete(mport))
1087 pr_debug("RIO: discovery timeout on mport %d %s\n",
1088 mport->id, mport->name);
1091 pr_debug("RIO: ... enumeration done\n");
1093 net = rio_scan_alloc_net(mport, 0, 0);
1095 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1099 /* Read DestID assigned by enumerator */
1100 rio_local_read_config_32(mport, RIO_DID_CSR,
1101 &mport->host_deviceid);
1102 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1103 mport->host_deviceid);
1105 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1108 "RIO: master port %d device has failed discovery\n",
1113 rio_build_route_tables(net);
1121 static struct rio_scan rio_scan_ops = {
1122 .owner = THIS_MODULE,
1123 .enumerate = rio_enum_mport,
1124 .discover = rio_disc_mport,
1128 module_param(scan, bool, 0);
1129 MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery "
1135 * When this enumeration/discovery method is loaded as a module this function
1136 * registers its specific enumeration and discover routines for all available
1137 * RapidIO mport devices. The "scan" command line parameter controls ability of
1138 * the module to start RapidIO enumeration/discovery automatically.
1140 * Returns 0 for success or -EIO if unable to register itself.
1142 * This enumeration/discovery method cannot be unloaded and therefore does not
1143 * provide a matching cleanup_module routine.
1146 static int __init rio_basic_attach(void)
1148 if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops))
1155 late_initcall(rio_basic_attach);
1157 MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
1158 MODULE_LICENSE("GPL");