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);
42 static int next_destid = 0;
43 static int next_comptag = 1;
45 static int rio_mport_phys_table[] = {
47 RIO_EFB_PAR_EP_REC_ID,
49 RIO_EFB_SER_EP_REC_ID,
55 * rio_destid_alloc - Allocate next available destID for given network
58 * Returns next available device destination ID for the specified RIO network.
59 * Marks allocated ID as one in use.
60 * Returns RIO_INVALID_DESTID if new destID is not available.
62 static u16 rio_destid_alloc(struct rio_net *net)
65 struct rio_id_table *idtab = &net->destid_table;
67 spin_lock(&idtab->lock);
68 destid = find_first_zero_bit(idtab->table, idtab->max);
70 if (destid < idtab->max) {
71 set_bit(destid, idtab->table);
72 destid += idtab->start;
74 destid = RIO_INVALID_DESTID;
76 spin_unlock(&idtab->lock);
81 * rio_destid_reserve - Reserve the specivied destID
83 * @destid: destID to reserve
85 * Tries to reserve the specified destID.
86 * Returns 0 if successfull.
88 static int rio_destid_reserve(struct rio_net *net, u16 destid)
91 struct rio_id_table *idtab = &net->destid_table;
93 destid -= idtab->start;
94 spin_lock(&idtab->lock);
95 oldbit = test_and_set_bit(destid, idtab->table);
96 spin_unlock(&idtab->lock);
101 * rio_destid_free - free a previously allocated destID
103 * @destid: destID to free
105 * Makes the specified destID available for use.
107 static void rio_destid_free(struct rio_net *net, u16 destid)
109 struct rio_id_table *idtab = &net->destid_table;
111 destid -= idtab->start;
112 spin_lock(&idtab->lock);
113 clear_bit(destid, idtab->table);
114 spin_unlock(&idtab->lock);
118 * rio_destid_first - return first destID in use
121 static u16 rio_destid_first(struct rio_net *net)
124 struct rio_id_table *idtab = &net->destid_table;
126 spin_lock(&idtab->lock);
127 destid = find_first_bit(idtab->table, idtab->max);
128 if (destid >= idtab->max)
129 destid = RIO_INVALID_DESTID;
131 destid += idtab->start;
132 spin_unlock(&idtab->lock);
137 * rio_destid_next - return next destID in use
139 * @from: destination ID from which search shall continue
141 static u16 rio_destid_next(struct rio_net *net, u16 from)
144 struct rio_id_table *idtab = &net->destid_table;
146 spin_lock(&idtab->lock);
147 destid = find_next_bit(idtab->table, idtab->max, from);
148 if (destid >= idtab->max)
149 destid = RIO_INVALID_DESTID;
151 destid += idtab->start;
152 spin_unlock(&idtab->lock);
157 * rio_get_device_id - Get the base/extended device id for a device
158 * @port: RIO master port
159 * @destid: Destination ID of device
160 * @hopcount: Hopcount to device
162 * Reads the base/extended device id from a device. Returns the
163 * 8/16-bit device ID.
165 static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
169 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
171 return RIO_GET_DID(port->sys_size, result);
175 * rio_set_device_id - Set the base/extended device id for a device
176 * @port: RIO master port
177 * @destid: Destination ID of device
178 * @hopcount: Hopcount to device
179 * @did: Device ID value to be written
181 * Writes the base/extended device id from a device.
183 static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
185 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
186 RIO_SET_DID(port->sys_size, did));
190 * rio_local_set_device_id - Set the base/extended device id for a port
191 * @port: RIO master port
192 * @did: Device ID value to be written
194 * Writes the base/extended device id from a device.
196 static void rio_local_set_device_id(struct rio_mport *port, u16 did)
198 rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
203 * rio_clear_locks- Release all host locks and signal enumeration complete
204 * @net: RIO network to run on
206 * Marks the component tag CSR on each device with the enumeration
207 * complete flag. When complete, it then release the host locks on
208 * each device. Returns 0 on success or %-EINVAL on failure.
210 static int rio_clear_locks(struct rio_net *net)
212 struct rio_mport *port = net->hport;
213 struct rio_dev *rdev;
217 /* Release host device id locks */
218 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
219 port->host_deviceid);
220 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
221 if ((result & 0xffff) != 0xffff) {
223 "RIO: badness when releasing host lock on master port, result %8.8x\n",
227 list_for_each_entry(rdev, &net->devices, net_list) {
228 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
229 port->host_deviceid);
230 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
231 if ((result & 0xffff) != 0xffff) {
233 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
234 rdev->vid, rdev->did);
238 /* Mark device as discovered and enable master */
239 rio_read_config_32(rdev,
240 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
242 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
243 rio_write_config_32(rdev,
244 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
252 * rio_enum_host- Set host lock and initialize host destination ID
253 * @port: Master port to issue transaction
255 * Sets the local host master port lock and destination ID register
256 * with the host device ID value. The host device ID value is provided
257 * by the platform. Returns %0 on success or %-1 on failure.
259 static int rio_enum_host(struct rio_mport *port)
263 /* Set master port host device id lock */
264 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
265 port->host_deviceid);
267 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
268 if ((result & 0xffff) != port->host_deviceid)
271 /* Set master port destid and init destid ctr */
272 rio_local_set_device_id(port, port->host_deviceid);
277 * rio_device_has_destid- Test if a device contains a destination ID register
278 * @port: Master port to issue transaction
279 * @src_ops: RIO device source operations
280 * @dst_ops: RIO device destination operations
282 * Checks the provided @src_ops and @dst_ops for the necessary transaction
283 * capabilities that indicate whether or not a device will implement a
284 * destination ID register. Returns 1 if true or 0 if false.
286 static int rio_device_has_destid(struct rio_mport *port, int src_ops,
289 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;
291 return !!((src_ops | dst_ops) & mask);
295 * rio_release_dev- Frees a RIO device struct
296 * @dev: LDM device associated with a RIO device struct
298 * Gets the RIO device struct associated a RIO device struct.
299 * The RIO device struct is freed.
301 static void rio_release_dev(struct device *dev)
303 struct rio_dev *rdev;
305 rdev = to_rio_dev(dev);
310 * rio_is_switch- Tests if a RIO device has switch capabilities
313 * Gets the RIO device Processing Element Features register
314 * contents and tests for switch capabilities. Returns 1 if
315 * the device is a switch or 0 if it is not a switch.
316 * The RIO device struct is freed.
318 static int rio_is_switch(struct rio_dev *rdev)
320 if (rdev->pef & RIO_PEF_SWITCH)
326 * rio_setup_device- Allocates and sets up a RIO device
328 * @port: Master port to send transactions
329 * @destid: Current destination ID
330 * @hopcount: Current hopcount
331 * @do_enum: Enumeration/Discovery mode flag
333 * Allocates a RIO device and configures fields based on configuration
334 * space contents. If device has a destination ID register, a destination
335 * ID is either assigned in enumeration mode or read from configuration
336 * space in discovery mode. If the device has switch capabilities, then
337 * a switch is allocated and configured appropriately. Returns a pointer
338 * to a RIO device on success or NULL on failure.
341 static struct rio_dev *rio_setup_device(struct rio_net *net,
342 struct rio_mport *port, u16 destid,
343 u8 hopcount, int do_enum)
346 struct rio_dev *rdev;
347 struct rio_switch *rswitch = NULL;
352 size = sizeof(struct rio_dev);
353 if (rio_mport_read_config_32(port, destid, hopcount,
354 RIO_PEF_CAR, &result))
357 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
358 rio_mport_read_config_32(port, destid, hopcount,
359 RIO_SWP_INFO_CAR, &swpinfo);
360 if (result & RIO_PEF_SWITCH) {
361 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
362 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
366 rdev = kzalloc(size, GFP_KERNEL);
372 rdev->swpinfo = swpinfo;
373 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
375 rdev->did = result >> 16;
376 rdev->vid = result & 0xffff;
377 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
379 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
381 rdev->asm_did = result >> 16;
382 rdev->asm_vid = result & 0xffff;
383 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
385 rdev->asm_rev = result >> 16;
386 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
387 rdev->efptr = result & 0xffff;
388 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
391 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
392 hopcount, RIO_EFB_ERR_MGMNT);
395 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
397 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
401 /* Assign component tag to device */
402 if (next_comptag >= 0x10000) {
403 pr_err("RIO: Component Tag Counter Overflow\n");
406 rio_mport_write_config_32(port, destid, hopcount,
407 RIO_COMPONENT_TAG_CSR, next_comptag);
408 rdev->comp_tag = next_comptag++;
410 rio_mport_read_config_32(port, destid, hopcount,
411 RIO_COMPONENT_TAG_CSR,
415 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
417 rio_set_device_id(port, destid, hopcount, next_destid);
418 rdev->destid = next_destid;
419 next_destid = rio_destid_alloc(net);
421 rdev->destid = rio_get_device_id(port, destid, hopcount);
423 rdev->hopcount = 0xff;
425 /* Switch device has an associated destID which
426 * will be adjusted later
428 rdev->destid = destid;
429 rdev->hopcount = hopcount;
432 /* If a PE has both switch and other functions, show it as a switch */
433 if (rio_is_switch(rdev)) {
434 rswitch = rdev->rswitch;
435 rswitch->switchid = rdev->comp_tag & RIO_CTAG_UDEVID;
436 rswitch->port_ok = 0;
437 rswitch->route_table = kzalloc(sizeof(u8)*
438 RIO_MAX_ROUTE_ENTRIES(port->sys_size),
440 if (!rswitch->route_table)
442 /* Initialize switch route table */
443 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
445 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
446 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
448 rio_switch_init(rdev, do_enum);
450 if (do_enum && rswitch->clr_table)
451 rswitch->clr_table(port, destid, hopcount,
454 list_add_tail(&rswitch->node, &net->switches);
458 /*Enable Input Output Port (transmitter reviever)*/
459 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
461 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
465 rio_attach_device(rdev);
467 device_initialize(&rdev->dev);
468 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);
487 kfree(rswitch->route_table);
494 * rio_sport_is_active- Tests if a switch port has an active connection.
495 * @port: Master port to send transaction
496 * @destid: Associated destination ID for switch
497 * @hopcount: Hopcount to reach switch
498 * @sport: Switch port number
500 * Reads the port error status CSR for a particular switch port to
501 * determine if the port has an active link. Returns
502 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
506 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
511 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
513 while (ext_ftr_ptr) {
514 rio_mport_read_config_32(port, destid, hopcount,
515 ext_ftr_ptr, &result);
516 result = RIO_GET_BLOCK_ID(result);
517 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
518 (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
519 (result == RIO_EFB_SER_EP_FREC_ID))
522 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
527 rio_mport_read_config_32(port, destid, hopcount,
529 RIO_PORT_N_ERR_STS_CSR(sport),
532 return result & RIO_PORT_N_ERR_STS_PORT_OK;
536 * rio_lock_device - Acquires host device lock for specified device
537 * @port: Master port to send transaction
538 * @destid: Destination ID for device/switch
539 * @hopcount: Hopcount to reach switch
540 * @wait_ms: Max wait time in msec (0 = no timeout)
542 * Attepts to acquire host device lock for specified device
543 * Returns 0 if device lock acquired or EINVAL if timeout expires.
546 rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
551 /* Attempt to acquire device lock */
552 rio_mport_write_config_32(port, destid, hopcount,
553 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
554 rio_mport_read_config_32(port, destid, hopcount,
555 RIO_HOST_DID_LOCK_CSR, &result);
557 while (result != port->host_deviceid) {
558 if (wait_ms != 0 && tcnt == wait_ms) {
559 pr_debug("RIO: timeout when locking device %x:%x\n",
567 /* Try to acquire device lock again */
568 rio_mport_write_config_32(port, destid,
570 RIO_HOST_DID_LOCK_CSR,
571 port->host_deviceid);
572 rio_mport_read_config_32(port, destid,
574 RIO_HOST_DID_LOCK_CSR, &result);
581 * rio_unlock_device - Releases host device lock for specified device
582 * @port: Master port to send transaction
583 * @destid: Destination ID for device/switch
584 * @hopcount: Hopcount to reach switch
586 * Returns 0 if device lock released or EINVAL if fails.
589 rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
593 /* Release device lock */
594 rio_mport_write_config_32(port, destid,
596 RIO_HOST_DID_LOCK_CSR,
597 port->host_deviceid);
598 rio_mport_read_config_32(port, destid, hopcount,
599 RIO_HOST_DID_LOCK_CSR, &result);
600 if ((result & 0xffff) != 0xffff) {
601 pr_debug("RIO: badness when releasing device lock %x:%x\n",
610 * rio_route_add_entry- Add a route entry to a switch routing table
612 * @table: Routing table ID
613 * @route_destid: Destination ID to be routed
614 * @route_port: Port number to be routed
615 * @lock: lock switch device flag
617 * Calls the switch specific add_entry() method to add a route entry
618 * on a switch. The route table can be specified using the @table
619 * argument if a switch has per port routing tables or the normal
620 * use is to specific all tables (or the global table) by passing
621 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
625 rio_route_add_entry(struct rio_dev *rdev,
626 u16 table, u16 route_destid, u8 route_port, int lock)
631 rc = rio_lock_device(rdev->net->hport, rdev->destid,
632 rdev->hopcount, 1000);
637 rc = rdev->rswitch->add_entry(rdev->net->hport, rdev->destid,
638 rdev->hopcount, table,
639 route_destid, route_port);
641 rio_unlock_device(rdev->net->hport, rdev->destid,
648 * rio_route_get_entry- Read a route entry in a switch routing table
650 * @table: Routing table ID
651 * @route_destid: Destination ID to be routed
652 * @route_port: Pointer to read port number into
653 * @lock: lock switch device flag
655 * Calls the switch specific get_entry() method to read a route entry
656 * in a switch. The route table can be specified using the @table
657 * argument if a switch has per port routing tables or the normal
658 * use is to specific all tables (or the global table) by passing
659 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
663 rio_route_get_entry(struct rio_dev *rdev, u16 table,
664 u16 route_destid, u8 *route_port, int lock)
669 rc = rio_lock_device(rdev->net->hport, rdev->destid,
670 rdev->hopcount, 1000);
675 rc = rdev->rswitch->get_entry(rdev->net->hport, rdev->destid,
676 rdev->hopcount, table,
677 route_destid, route_port);
679 rio_unlock_device(rdev->net->hport, rdev->destid,
686 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
687 * @port: Master port to send transaction
688 * @hopcount: Number of hops to the device
690 * Used during enumeration to read the Host Device ID Lock CSR on a
691 * RIO device. Returns the value of the lock register.
693 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
697 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
698 RIO_HOST_DID_LOCK_CSR, &result);
700 return (u16) (result & 0xffff);
704 * rio_enum_peer- Recursively enumerate a RIO network through a master port
705 * @net: RIO network being enumerated
706 * @port: Master port to send transactions
707 * @hopcount: Number of hops into the network
708 * @prev: Previous RIO device connected to the enumerated one
709 * @prev_port: Port on previous RIO device
711 * Recursively enumerates a RIO network. Transactions are sent via the
712 * master port passed in @port.
714 static int rio_enum_peer(struct rio_net *net, struct rio_mport *port,
715 u8 hopcount, struct rio_dev *prev, int prev_port)
717 struct rio_dev *rdev;
721 if (rio_mport_chk_dev_access(port,
722 RIO_ANY_DESTID(port->sys_size), hopcount)) {
723 pr_debug("RIO: device access check failed\n");
727 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
728 pr_debug("RIO: PE already discovered by this host\n");
730 * Already discovered by this host. Add it as another
731 * link to the existing device.
733 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
734 hopcount, RIO_COMPONENT_TAG_CSR, ®val);
737 rdev = rio_get_comptag((regval & 0xffff), NULL);
739 if (rdev && prev && rio_is_switch(prev)) {
740 pr_debug("RIO: redundant path to %s\n",
742 prev->rswitch->nextdev[prev_port] = rdev;
749 /* Attempt to acquire device lock */
750 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
752 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
753 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
754 < port->host_deviceid) {
757 /* Attempt to acquire device lock again */
758 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
760 RIO_HOST_DID_LOCK_CSR,
761 port->host_deviceid);
764 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
766 "RIO: PE locked by a higher priority host...retreating\n");
770 /* Setup new RIO device */
771 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
774 /* Add device to the global and bus/net specific list. */
775 list_add_tail(&rdev->net_list, &net->devices);
777 if (prev && rio_is_switch(prev))
778 prev->rswitch->nextdev[prev_port] = rdev;
782 if (rio_is_switch(rdev)) {
789 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
790 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
791 port->host_deviceid, sw_inport, 0);
792 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
794 destid = rio_destid_first(net);
795 while (destid != RIO_INVALID_DESTID && destid < next_destid) {
796 if (destid != port->host_deviceid) {
797 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
798 destid, sw_inport, 0);
799 rdev->rswitch->route_table[destid] = sw_inport;
801 destid = rio_destid_next(net, destid + 1);
804 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
805 rio_name(rdev), rdev->vid, rdev->did,
806 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
807 sw_destid = next_destid;
809 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
811 if (sw_inport == port_num) {
812 rio_enable_rx_tx_port(port, 0,
813 RIO_ANY_DESTID(port->sys_size),
815 rdev->rswitch->port_ok |= (1 << port_num);
819 cur_destid = next_destid;
821 if (rio_sport_is_active
822 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
825 "RIO: scanning device on port %d\n",
827 rio_enable_rx_tx_port(port, 0,
828 RIO_ANY_DESTID(port->sys_size),
830 rdev->rswitch->port_ok |= (1 << port_num);
831 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
832 RIO_ANY_DESTID(port->sys_size),
835 if (rio_enum_peer(net, port, hopcount + 1,
839 /* Update routing tables */
840 destid = rio_destid_next(net, cur_destid + 1);
841 if (destid != RIO_INVALID_DESTID) {
842 for (destid = cur_destid;
843 destid < next_destid;) {
844 if (destid != port->host_deviceid) {
845 rio_route_add_entry(rdev,
851 route_table[destid] =
854 destid = rio_destid_next(net,
859 /* If switch supports Error Management,
860 * set PORT_LOCKOUT bit for unused port
863 rio_set_port_lockout(rdev, port_num, 1);
865 rdev->rswitch->port_ok &= ~(1 << port_num);
869 /* Direct Port-write messages to the enumeratiing host */
870 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
872 rio_write_config_32(rdev,
873 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
874 (port->host_deviceid << 16) |
875 (port->sys_size << 15));
880 /* Check for empty switch */
881 if (next_destid == sw_destid)
882 next_destid = rio_destid_alloc(net);
884 rdev->destid = sw_destid;
886 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
887 rio_name(rdev), rdev->vid, rdev->did);
893 * rio_enum_complete- Tests if enumeration of a network is complete
894 * @port: Master port to send transaction
896 * Tests the PGCCSR discovered bit for non-zero value (enumeration
897 * complete flag). Return %1 if enumeration is complete or %0 if
898 * enumeration is incomplete.
900 static int rio_enum_complete(struct rio_mport *port)
904 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
906 return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
910 * rio_disc_peer- Recursively discovers a RIO network through a master port
911 * @net: RIO network being discovered
912 * @port: Master port to send transactions
913 * @destid: Current destination ID in network
914 * @hopcount: Number of hops into the network
915 * @prev: previous rio_dev
916 * @prev_port: previous port number
918 * Recursively discovers a RIO network. Transactions are sent via the
919 * master port passed in @port.
922 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
923 u8 hopcount, struct rio_dev *prev, int prev_port)
925 u8 port_num, route_port;
926 struct rio_dev *rdev;
929 /* Setup new RIO device */
930 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
931 /* Add device to the global and bus/net specific list. */
932 list_add_tail(&rdev->net_list, &net->devices);
934 if (prev && rio_is_switch(prev))
935 prev->rswitch->nextdev[prev_port] = rdev;
939 if (rio_is_switch(rdev)) {
940 /* Associated destid is how we accessed this switch */
941 rdev->destid = destid;
944 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
945 rio_name(rdev), rdev->vid, rdev->did,
946 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
948 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
950 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
953 if (rio_sport_is_active
954 (port, destid, hopcount, port_num)) {
956 "RIO: scanning device on port %d\n",
959 rio_lock_device(port, destid, hopcount, 1000);
962 ndestid < RIO_ANY_DESTID(port->sys_size);
964 rio_route_get_entry(rdev,
968 if (route_port == port_num)
972 if (ndestid == RIO_ANY_DESTID(port->sys_size))
974 rio_unlock_device(port, destid, hopcount);
975 if (rio_disc_peer(net, port, ndestid,
976 hopcount + 1, rdev, port_num) < 0)
981 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
982 rio_name(rdev), rdev->vid, rdev->did);
988 * rio_mport_is_active- Tests if master port link is active
989 * @port: Master port to test
991 * Reads the port error status CSR for the master port to
992 * determine if the port has an active link. Returns
993 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
994 * or %0 if it is inactive.
996 static int rio_mport_is_active(struct rio_mport *port)
1000 int *entry = rio_mport_phys_table;
1004 rio_mport_get_feature(port, 1, 0, 0, *entry)))
1006 } while (*++entry >= 0);
1009 rio_local_read_config_32(port,
1011 RIO_PORT_N_ERR_STS_CSR(port->index),
1014 return result & RIO_PORT_N_ERR_STS_PORT_OK;
1018 * rio_alloc_net- Allocate and configure a new RIO network
1019 * @port: Master port associated with the RIO network
1020 * @do_enum: Enumeration/Discovery mode flag
1021 * @start: logical minimal start id for new net
1023 * Allocates a RIO network structure, initializes per-network
1024 * list heads, and adds the associated master port to the
1025 * network list of associated master ports. Returns a
1026 * RIO network pointer on success or %NULL on failure.
1028 static struct rio_net *rio_alloc_net(struct rio_mport *port,
1029 int do_enum, u16 start)
1031 struct rio_net *net;
1033 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
1034 if (net && do_enum) {
1035 net->destid_table.table = kcalloc(
1036 BITS_TO_LONGS(RIO_MAX_ROUTE_ENTRIES(port->sys_size)),
1040 if (net->destid_table.table == NULL) {
1041 pr_err("RIO: failed to allocate destID table\n");
1045 net->destid_table.start = start;
1046 net->destid_table.max =
1047 RIO_MAX_ROUTE_ENTRIES(port->sys_size);
1048 spin_lock_init(&net->destid_table.lock);
1053 INIT_LIST_HEAD(&net->node);
1054 INIT_LIST_HEAD(&net->devices);
1055 INIT_LIST_HEAD(&net->switches);
1056 INIT_LIST_HEAD(&net->mports);
1057 list_add_tail(&port->nnode, &net->mports);
1065 * rio_update_route_tables- Updates route tables in switches
1066 * @net: RIO network to run update on
1068 * For each enumerated device, ensure that each switch in a system
1069 * has correct routing entries. Add routes for devices that where
1070 * unknown dirung the first enumeration pass through the switch.
1072 static void rio_update_route_tables(struct rio_net *net)
1074 struct rio_dev *rdev, *swrdev;
1075 struct rio_switch *rswitch;
1079 list_for_each_entry(rdev, &net->devices, net_list) {
1081 destid = rdev->destid;
1083 list_for_each_entry(rswitch, &net->switches, node) {
1085 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
1088 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
1089 swrdev = sw_to_rio_dev(rswitch);
1091 /* Skip if destid ends in empty switch*/
1092 if (swrdev->destid == destid)
1095 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
1097 if (rswitch->add_entry) {
1098 rio_route_add_entry(swrdev,
1099 RIO_GLOBAL_TABLE, destid,
1101 rswitch->route_table[destid] = sport;
1109 * rio_init_em - Initializes RIO Error Management (for switches)
1112 * For each enumerated switch, call device-specific error management
1113 * initialization routine (if supplied by the switch driver).
1115 static void rio_init_em(struct rio_dev *rdev)
1117 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
1118 (rdev->rswitch->em_init)) {
1119 rdev->rswitch->em_init(rdev);
1124 * rio_pw_enable - Enables/disables port-write handling by a master port
1125 * @port: Master port associated with port-write handling
1126 * @enable: 1=enable, 0=disable
1128 static void rio_pw_enable(struct rio_mport *port, int enable)
1130 if (port->ops->pwenable)
1131 port->ops->pwenable(port, enable);
1135 * rio_enum_mport- Start enumeration through a master port
1136 * @mport: Master port to send transactions
1137 * @flags: Enumeration control flags
1139 * Starts the enumeration process. If somebody has enumerated our
1140 * master port device, then give up. If not and we have an active
1141 * link, then start recursive peer enumeration. Returns %0 if
1142 * enumeration succeeds or %-EBUSY if enumeration fails.
1144 int rio_enum_mport(struct rio_mport *mport, u32 flags)
1146 struct rio_net *net = NULL;
1149 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1153 * To avoid multiple start requests (repeat enumeration is not supported
1154 * by this method) check if enumeration/discovery was performed for this
1155 * mport: if mport was added into the list of mports for a net exit
1158 if (mport->nnode.next || mport->nnode.prev)
1161 /* If somebody else enumerated our master port device, bail. */
1162 if (rio_enum_host(mport) < 0) {
1164 "RIO: master port %d device has been enumerated by a remote host\n",
1170 /* If master port has an active link, allocate net and enum peers */
1171 if (rio_mport_is_active(mport)) {
1172 net = rio_alloc_net(mport, 1, 0);
1174 printk(KERN_ERR "RIO: failed to allocate new net\n");
1179 /* reserve mport destID in new net */
1180 rio_destid_reserve(net, mport->host_deviceid);
1182 /* Enable Input Output Port (transmitter reviever) */
1183 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1185 /* Set component tag for host */
1186 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1189 next_destid = rio_destid_alloc(net);
1191 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1192 /* A higher priority host won enumeration, bail. */
1194 "RIO: master port %d device has lost enumeration to a remote host\n",
1196 rio_clear_locks(net);
1200 /* free the last allocated destID (unused) */
1201 rio_destid_free(net, next_destid);
1202 rio_update_route_tables(net);
1203 rio_clear_locks(net);
1204 rio_pw_enable(mport, 1);
1206 printk(KERN_INFO "RIO: master port %d link inactive\n",
1216 * rio_build_route_tables- Generate route tables from switch route entries
1217 * @net: RIO network to run route tables scan on
1219 * For each switch device, generate a route table by copying existing
1220 * route entries from the switch.
1222 static void rio_build_route_tables(struct rio_net *net)
1224 struct rio_switch *rswitch;
1225 struct rio_dev *rdev;
1229 list_for_each_entry(rswitch, &net->switches, node) {
1230 rdev = sw_to_rio_dev(rswitch);
1232 rio_lock_device(net->hport, rdev->destid,
1233 rdev->hopcount, 1000);
1235 i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
1237 if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
1240 rswitch->route_table[i] = sport;
1243 rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
1248 * rio_disc_mport- Start discovery through a master port
1249 * @mport: Master port to send transactions
1250 * @flags: discovery control flags
1252 * Starts the discovery process. If we have an active link,
1253 * then wait for the signal that enumeration is complete (if wait
1255 * When enumeration completion is signaled, start recursive
1256 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1259 int rio_disc_mport(struct rio_mport *mport, u32 flags)
1261 struct rio_net *net = NULL;
1262 unsigned long to_end;
1264 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1267 /* If master port has an active link, allocate net and discover peers */
1268 if (rio_mport_is_active(mport)) {
1269 if (rio_enum_complete(mport))
1271 else if (flags & RIO_SCAN_ENUM_NO_WAIT)
1274 pr_debug("RIO: wait for enumeration to complete...\n");
1276 to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1277 while (time_before(jiffies, to_end)) {
1278 if (rio_enum_complete(mport))
1283 pr_debug("RIO: discovery timeout on mport %d %s\n",
1284 mport->id, mport->name);
1287 pr_debug("RIO: ... enumeration done\n");
1289 net = rio_alloc_net(mport, 0, 0);
1291 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1295 /* Read DestID assigned by enumerator */
1296 rio_local_read_config_32(mport, RIO_DID_CSR,
1297 &mport->host_deviceid);
1298 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1299 mport->host_deviceid);
1301 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1304 "RIO: master port %d device has failed discovery\n",
1309 rio_build_route_tables(net);
1317 static struct rio_scan rio_scan_ops = {
1318 .enumerate = rio_enum_mport,
1319 .discover = rio_disc_mport,
1323 module_param(scan, bool, 0);
1324 MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery "
1330 * When this enumeration/discovery method is loaded as a module this function
1331 * registers its specific enumeration and discover routines for all available
1332 * RapidIO mport devices. The "scan" command line parameter controls ability of
1333 * the module to start RapidIO enumeration/discovery automatically.
1335 * Returns 0 for success or -EIO if unable to register itself.
1337 * This enumeration/discovery method cannot be unloaded and therefore does not
1338 * provide a matching cleanup_module routine.
1341 static int __init rio_basic_attach(void)
1343 if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops))
1350 late_initcall(rio_basic_attach);
1352 MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
1353 MODULE_LICENSE("GPL");