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/jiffies.h>
35 #include <linux/slab.h>
39 LIST_HEAD(rio_devices
);
40 static LIST_HEAD(rio_switches
);
42 static void rio_enum_timeout(unsigned long);
44 static void rio_init_em(struct rio_dev
*rdev
);
46 DEFINE_SPINLOCK(rio_global_list_lock
);
48 static int next_destid
= 0;
49 static int next_switchid
= 0;
50 static int next_net
= 0;
51 static int next_comptag
= 1;
53 static struct timer_list rio_enum_timer
=
54 TIMER_INITIALIZER(rio_enum_timeout
, 0, 0);
56 static int rio_mport_phys_table
[] = {
58 RIO_EFB_PAR_EP_REC_ID
,
60 RIO_EFB_SER_EP_REC_ID
,
65 * rio_get_device_id - Get the base/extended device id for a device
66 * @port: RIO master port
67 * @destid: Destination ID of device
68 * @hopcount: Hopcount to device
70 * Reads the base/extended device id from a device. Returns the
73 static u16
rio_get_device_id(struct rio_mport
*port
, u16 destid
, u8 hopcount
)
77 rio_mport_read_config_32(port
, destid
, hopcount
, RIO_DID_CSR
, &result
);
79 return RIO_GET_DID(port
->sys_size
, result
);
83 * rio_set_device_id - Set the base/extended device id for a device
84 * @port: RIO master port
85 * @destid: Destination ID of device
86 * @hopcount: Hopcount to device
87 * @did: Device ID value to be written
89 * Writes the base/extended device id from a device.
91 static void rio_set_device_id(struct rio_mport
*port
, u16 destid
, u8 hopcount
, u16 did
)
93 rio_mport_write_config_32(port
, destid
, hopcount
, RIO_DID_CSR
,
94 RIO_SET_DID(port
->sys_size
, did
));
98 * rio_local_set_device_id - Set the base/extended device id for a port
99 * @port: RIO master port
100 * @did: Device ID value to be written
102 * Writes the base/extended device id from a device.
104 static void rio_local_set_device_id(struct rio_mport
*port
, u16 did
)
106 rio_local_write_config_32(port
, RIO_DID_CSR
, RIO_SET_DID(port
->sys_size
,
111 * rio_clear_locks- Release all host locks and signal enumeration complete
112 * @port: Master port to issue transaction
114 * Marks the component tag CSR on each device with the enumeration
115 * complete flag. When complete, it then release the host locks on
116 * each device. Returns 0 on success or %-EINVAL on failure.
118 static int rio_clear_locks(struct rio_mport
*port
)
120 struct rio_dev
*rdev
;
124 /* Release host device id locks */
125 rio_local_write_config_32(port
, RIO_HOST_DID_LOCK_CSR
,
126 port
->host_deviceid
);
127 rio_local_read_config_32(port
, RIO_HOST_DID_LOCK_CSR
, &result
);
128 if ((result
& 0xffff) != 0xffff) {
130 "RIO: badness when releasing host lock on master port, result %8.8x\n",
134 list_for_each_entry(rdev
, &rio_devices
, global_list
) {
135 rio_write_config_32(rdev
, RIO_HOST_DID_LOCK_CSR
,
136 port
->host_deviceid
);
137 rio_read_config_32(rdev
, RIO_HOST_DID_LOCK_CSR
, &result
);
138 if ((result
& 0xffff) != 0xffff) {
140 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
141 rdev
->vid
, rdev
->did
);
145 /* Mark device as discovered and enable master */
146 rio_read_config_32(rdev
,
147 rdev
->phys_efptr
+ RIO_PORT_GEN_CTL_CSR
,
149 result
|= RIO_PORT_GEN_DISCOVERED
| RIO_PORT_GEN_MASTER
;
150 rio_write_config_32(rdev
,
151 rdev
->phys_efptr
+ RIO_PORT_GEN_CTL_CSR
,
159 * rio_enum_host- Set host lock and initialize host destination ID
160 * @port: Master port to issue transaction
162 * Sets the local host master port lock and destination ID register
163 * with the host device ID value. The host device ID value is provided
164 * by the platform. Returns %0 on success or %-1 on failure.
166 static int rio_enum_host(struct rio_mport
*port
)
170 /* Set master port host device id lock */
171 rio_local_write_config_32(port
, RIO_HOST_DID_LOCK_CSR
,
172 port
->host_deviceid
);
174 rio_local_read_config_32(port
, RIO_HOST_DID_LOCK_CSR
, &result
);
175 if ((result
& 0xffff) != port
->host_deviceid
)
178 /* Set master port destid and init destid ctr */
179 rio_local_set_device_id(port
, port
->host_deviceid
);
181 if (next_destid
== port
->host_deviceid
)
188 * rio_device_has_destid- Test if a device contains a destination ID register
189 * @port: Master port to issue transaction
190 * @src_ops: RIO device source operations
191 * @dst_ops: RIO device destination operations
193 * Checks the provided @src_ops and @dst_ops for the necessary transaction
194 * capabilities that indicate whether or not a device will implement a
195 * destination ID register. Returns 1 if true or 0 if false.
197 static int rio_device_has_destid(struct rio_mport
*port
, int src_ops
,
200 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
;
202 return !!((src_ops
| dst_ops
) & mask
);
206 * rio_release_dev- Frees a RIO device struct
207 * @dev: LDM device associated with a RIO device struct
209 * Gets the RIO device struct associated a RIO device struct.
210 * The RIO device struct is freed.
212 static void rio_release_dev(struct device
*dev
)
214 struct rio_dev
*rdev
;
216 rdev
= to_rio_dev(dev
);
221 * rio_is_switch- Tests if a RIO device has switch capabilities
224 * Gets the RIO device Processing Element Features register
225 * contents and tests for switch capabilities. Returns 1 if
226 * the device is a switch or 0 if it is not a switch.
227 * The RIO device struct is freed.
229 static int rio_is_switch(struct rio_dev
*rdev
)
231 if (rdev
->pef
& RIO_PEF_SWITCH
)
237 * rio_switch_init - Sets switch operations for a particular vendor switch
239 * @do_enum: Enumeration/Discovery mode flag
241 * Searches the RIO switch ops table for known switch types. If the vid
242 * and did match a switch table entry, then call switch initialization
243 * routine to setup switch-specific routines.
245 static void rio_switch_init(struct rio_dev
*rdev
, int do_enum
)
247 struct rio_switch_ops
*cur
= __start_rio_switch_ops
;
248 struct rio_switch_ops
*end
= __end_rio_switch_ops
;
251 if ((cur
->vid
== rdev
->vid
) && (cur
->did
== rdev
->did
)) {
252 pr_debug("RIO: calling init routine for %s\n",
254 cur
->init_hook(rdev
, do_enum
);
260 if ((cur
>= end
) && (rdev
->pef
& RIO_PEF_STD_RT
)) {
261 pr_debug("RIO: adding STD routing ops for %s\n",
263 rdev
->rswitch
->add_entry
= rio_std_route_add_entry
;
264 rdev
->rswitch
->get_entry
= rio_std_route_get_entry
;
265 rdev
->rswitch
->clr_table
= rio_std_route_clr_table
;
268 if (!rdev
->rswitch
->add_entry
|| !rdev
->rswitch
->get_entry
)
269 printk(KERN_ERR
"RIO: missing routing ops for %s\n",
274 * rio_add_device- Adds a RIO device to the device model
277 * Adds the RIO device to the global device list and adds the RIO
278 * device to the RIO device list. Creates the generic sysfs nodes
281 static int __devinit
rio_add_device(struct rio_dev
*rdev
)
285 err
= device_add(&rdev
->dev
);
289 spin_lock(&rio_global_list_lock
);
290 list_add_tail(&rdev
->global_list
, &rio_devices
);
291 spin_unlock(&rio_global_list_lock
);
293 rio_create_sysfs_dev_files(rdev
);
299 * rio_enable_rx_tx_port - enable input reciever and output transmitter of
301 * @port: Master port associated with the RIO network
302 * @local: local=1 select local port otherwise a far device is reached
303 * @destid: Destination ID of the device to check host bit
304 * @hopcount: Number of hops to reach the target
305 * @port_num: Port (-number on switch) to enable on a far end device
307 * Returns 0 or 1 from on General Control Command and Status Register
310 inline int rio_enable_rx_tx_port(struct rio_mport
*port
,
311 int local
, u16 destid
,
312 u8 hopcount
, u8 port_num
) {
313 #ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
318 * enable rx input tx output port
320 pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
321 "%d, port_num = %d)\n", local
, destid
, hopcount
, port_num
);
323 ext_ftr_ptr
= rio_mport_get_physefb(port
, local
, destid
, hopcount
);
326 rio_local_read_config_32(port
, ext_ftr_ptr
+
327 RIO_PORT_N_CTL_CSR(0),
330 if (rio_mport_read_config_32(port
, destid
, hopcount
,
331 ext_ftr_ptr
+ RIO_PORT_N_CTL_CSR(port_num
), ®val
) < 0)
335 if (regval
& RIO_PORT_N_CTL_P_TYP_SER
) {
337 regval
= regval
| RIO_PORT_N_CTL_EN_RX_SER
338 | RIO_PORT_N_CTL_EN_TX_SER
;
341 regval
= regval
| RIO_PORT_N_CTL_EN_RX_PAR
342 | RIO_PORT_N_CTL_EN_TX_PAR
;
346 rio_local_write_config_32(port
, ext_ftr_ptr
+
347 RIO_PORT_N_CTL_CSR(0), regval
);
349 if (rio_mport_write_config_32(port
, destid
, hopcount
,
350 ext_ftr_ptr
+ RIO_PORT_N_CTL_CSR(port_num
), regval
) < 0)
358 * rio_setup_device- Allocates and sets up a RIO device
360 * @port: Master port to send transactions
361 * @destid: Current destination ID
362 * @hopcount: Current hopcount
363 * @do_enum: Enumeration/Discovery mode flag
365 * Allocates a RIO device and configures fields based on configuration
366 * space contents. If device has a destination ID register, a destination
367 * ID is either assigned in enumeration mode or read from configuration
368 * space in discovery mode. If the device has switch capabilities, then
369 * a switch is allocated and configured appropriately. Returns a pointer
370 * to a RIO device on success or NULL on failure.
373 static struct rio_dev __devinit
*rio_setup_device(struct rio_net
*net
,
374 struct rio_mport
*port
, u16 destid
,
375 u8 hopcount
, int do_enum
)
378 struct rio_dev
*rdev
;
379 struct rio_switch
*rswitch
= NULL
;
382 rdev
= kzalloc(sizeof(struct rio_dev
), GFP_KERNEL
);
387 rio_mport_read_config_32(port
, destid
, hopcount
, RIO_DEV_ID_CAR
,
389 rdev
->did
= result
>> 16;
390 rdev
->vid
= result
& 0xffff;
391 rio_mport_read_config_32(port
, destid
, hopcount
, RIO_DEV_INFO_CAR
,
393 rio_mport_read_config_32(port
, destid
, hopcount
, RIO_ASM_ID_CAR
,
395 rdev
->asm_did
= result
>> 16;
396 rdev
->asm_vid
= result
& 0xffff;
397 rio_mport_read_config_32(port
, destid
, hopcount
, RIO_ASM_INFO_CAR
,
399 rdev
->asm_rev
= result
>> 16;
400 rio_mport_read_config_32(port
, destid
, hopcount
, RIO_PEF_CAR
,
402 if (rdev
->pef
& RIO_PEF_EXT_FEATURES
) {
403 rdev
->efptr
= result
& 0xffff;
404 rdev
->phys_efptr
= rio_mport_get_physefb(port
, 0, destid
,
407 rdev
->em_efptr
= rio_mport_get_feature(port
, 0, destid
,
408 hopcount
, RIO_EFB_ERR_MGMNT
);
411 if (rdev
->pef
& (RIO_PEF_SWITCH
| RIO_PEF_MULTIPORT
)) {
412 rio_mport_read_config_32(port
, destid
, hopcount
,
413 RIO_SWP_INFO_CAR
, &rdev
->swpinfo
);
416 rio_mport_read_config_32(port
, destid
, hopcount
, RIO_SRC_OPS_CAR
,
418 rio_mport_read_config_32(port
, destid
, hopcount
, RIO_DST_OPS_CAR
,
422 /* Assign component tag to device */
423 if (next_comptag
>= 0x10000) {
424 pr_err("RIO: Component Tag Counter Overflow\n");
427 rio_mport_write_config_32(port
, destid
, hopcount
,
428 RIO_COMPONENT_TAG_CSR
, next_comptag
);
429 rdev
->comp_tag
= next_comptag
++;
432 if (rio_device_has_destid(port
, rdev
->src_ops
, rdev
->dst_ops
)) {
434 rio_set_device_id(port
, destid
, hopcount
, next_destid
);
435 rdev
->destid
= next_destid
++;
436 if (next_destid
== port
->host_deviceid
)
439 rdev
->destid
= rio_get_device_id(port
, destid
, hopcount
);
441 /* Switch device has an associated destID */
442 rdev
->destid
= RIO_INVALID_DESTID
;
444 /* If a PE has both switch and other functions, show it as a switch */
445 if (rio_is_switch(rdev
)) {
446 rswitch
= kzalloc(sizeof(*rswitch
) +
447 RIO_GET_TOTAL_PORTS(rdev
->swpinfo
) *
448 sizeof(rswitch
->nextdev
[0]),
452 rswitch
->switchid
= next_switchid
;
453 rswitch
->hopcount
= hopcount
;
454 rswitch
->destid
= destid
;
455 rswitch
->port_ok
= 0;
456 rswitch
->route_table
= kzalloc(sizeof(u8
)*
457 RIO_MAX_ROUTE_ENTRIES(port
->sys_size
),
459 if (!rswitch
->route_table
)
461 /* Initialize switch route table */
462 for (rdid
= 0; rdid
< RIO_MAX_ROUTE_ENTRIES(port
->sys_size
);
464 rswitch
->route_table
[rdid
] = RIO_INVALID_ROUTE
;
465 rdev
->rswitch
= rswitch
;
466 rswitch
->rdev
= rdev
;
467 dev_set_name(&rdev
->dev
, "%02x:s:%04x", rdev
->net
->id
,
468 rdev
->rswitch
->switchid
);
469 rio_switch_init(rdev
, do_enum
);
471 if (do_enum
&& rdev
->rswitch
->clr_table
)
472 rdev
->rswitch
->clr_table(port
, destid
, hopcount
,
475 list_add_tail(&rswitch
->node
, &rio_switches
);
479 /*Enable Input Output Port (transmitter reviever)*/
480 rio_enable_rx_tx_port(port
, 0, destid
, hopcount
, 0);
482 dev_set_name(&rdev
->dev
, "%02x:e:%04x", rdev
->net
->id
,
486 rdev
->dev
.bus
= &rio_bus_type
;
487 rdev
->dev
.parent
= &rio_bus
;
489 device_initialize(&rdev
->dev
);
490 rdev
->dev
.release
= rio_release_dev
;
493 rdev
->dma_mask
= DMA_BIT_MASK(32);
494 rdev
->dev
.dma_mask
= &rdev
->dma_mask
;
495 rdev
->dev
.coherent_dma_mask
= DMA_BIT_MASK(32);
497 if ((rdev
->pef
& RIO_PEF_INB_DOORBELL
) &&
498 (rdev
->dst_ops
& RIO_DST_OPS_DOORBELL
))
499 rio_init_dbell_res(&rdev
->riores
[RIO_DOORBELL_RESOURCE
],
502 ret
= rio_add_device(rdev
);
510 kfree(rswitch
->route_table
);
518 * rio_sport_is_active- Tests if a switch port has an active connection.
519 * @port: Master port to send transaction
520 * @destid: Associated destination ID for switch
521 * @hopcount: Hopcount to reach switch
522 * @sport: Switch port number
524 * Reads the port error status CSR for a particular switch port to
525 * determine if the port has an active link. Returns
526 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
530 rio_sport_is_active(struct rio_mport
*port
, u16 destid
, u8 hopcount
, int sport
)
535 ext_ftr_ptr
= rio_mport_get_efb(port
, 0, destid
, hopcount
, 0);
537 while (ext_ftr_ptr
) {
538 rio_mport_read_config_32(port
, destid
, hopcount
,
539 ext_ftr_ptr
, &result
);
540 result
= RIO_GET_BLOCK_ID(result
);
541 if ((result
== RIO_EFB_SER_EP_FREE_ID
) ||
542 (result
== RIO_EFB_SER_EP_FREE_ID_V13P
) ||
543 (result
== RIO_EFB_SER_EP_FREC_ID
))
546 ext_ftr_ptr
= rio_mport_get_efb(port
, 0, destid
, hopcount
,
551 rio_mport_read_config_32(port
, destid
, hopcount
,
553 RIO_PORT_N_ERR_STS_CSR(sport
),
556 return result
& RIO_PORT_N_ERR_STS_PORT_OK
;
560 * rio_lock_device - Acquires host device lock for specified device
561 * @port: Master port to send transaction
562 * @destid: Destination ID for device/switch
563 * @hopcount: Hopcount to reach switch
564 * @wait_ms: Max wait time in msec (0 = no timeout)
566 * Attepts to acquire host device lock for specified device
567 * Returns 0 if device lock acquired or EINVAL if timeout expires.
570 rio_lock_device(struct rio_mport
*port
, u16 destid
, u8 hopcount
, int wait_ms
)
575 /* Attempt to acquire device lock */
576 rio_mport_write_config_32(port
, destid
, hopcount
,
577 RIO_HOST_DID_LOCK_CSR
, port
->host_deviceid
);
578 rio_mport_read_config_32(port
, destid
, hopcount
,
579 RIO_HOST_DID_LOCK_CSR
, &result
);
581 while (result
!= port
->host_deviceid
) {
582 if (wait_ms
!= 0 && tcnt
== wait_ms
) {
583 pr_debug("RIO: timeout when locking device %x:%x\n",
591 /* Try to acquire device lock again */
592 rio_mport_write_config_32(port
, destid
,
594 RIO_HOST_DID_LOCK_CSR
,
595 port
->host_deviceid
);
596 rio_mport_read_config_32(port
, destid
,
598 RIO_HOST_DID_LOCK_CSR
, &result
);
605 * rio_unlock_device - Releases host device lock for specified device
606 * @port: Master port to send transaction
607 * @destid: Destination ID for device/switch
608 * @hopcount: Hopcount to reach switch
610 * Returns 0 if device lock released or EINVAL if fails.
613 rio_unlock_device(struct rio_mport
*port
, u16 destid
, u8 hopcount
)
617 /* Release device lock */
618 rio_mport_write_config_32(port
, destid
,
620 RIO_HOST_DID_LOCK_CSR
,
621 port
->host_deviceid
);
622 rio_mport_read_config_32(port
, destid
, hopcount
,
623 RIO_HOST_DID_LOCK_CSR
, &result
);
624 if ((result
& 0xffff) != 0xffff) {
625 pr_debug("RIO: badness when releasing device lock %x:%x\n",
634 * rio_route_add_entry- Add a route entry to a switch routing table
635 * @mport: Master port to send transaction
636 * @rswitch: Switch device
637 * @table: Routing table ID
638 * @route_destid: Destination ID to be routed
639 * @route_port: Port number to be routed
640 * @lock: lock switch device flag
642 * Calls the switch specific add_entry() method to add a route entry
643 * on a switch. The route table can be specified using the @table
644 * argument if a switch has per port routing tables or the normal
645 * use is to specific all tables (or the global table) by passing
646 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
650 rio_route_add_entry(struct rio_mport
*mport
, struct rio_switch
*rswitch
,
651 u16 table
, u16 route_destid
, u8 route_port
, int lock
)
656 rc
= rio_lock_device(mport
, rswitch
->destid
,
657 rswitch
->hopcount
, 1000);
662 rc
= rswitch
->add_entry(mport
, rswitch
->destid
,
663 rswitch
->hopcount
, table
,
664 route_destid
, route_port
);
666 rio_unlock_device(mport
, rswitch
->destid
, rswitch
->hopcount
);
672 * rio_route_get_entry- Read a route entry in a switch routing table
673 * @mport: Master port to send transaction
674 * @rswitch: Switch device
675 * @table: Routing table ID
676 * @route_destid: Destination ID to be routed
677 * @route_port: Pointer to read port number into
678 * @lock: lock switch device flag
680 * Calls the switch specific get_entry() method to read a route entry
681 * in a switch. The route table can be specified using the @table
682 * argument if a switch has per port routing tables or the normal
683 * use is to specific all tables (or the global table) by passing
684 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
688 rio_route_get_entry(struct rio_mport
*mport
, struct rio_switch
*rswitch
, u16 table
,
689 u16 route_destid
, u8
*route_port
, int lock
)
694 rc
= rio_lock_device(mport
, rswitch
->destid
,
695 rswitch
->hopcount
, 1000);
700 rc
= rswitch
->get_entry(mport
, rswitch
->destid
,
701 rswitch
->hopcount
, table
,
702 route_destid
, route_port
);
704 rio_unlock_device(mport
, rswitch
->destid
, rswitch
->hopcount
);
710 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
711 * @port: Master port to send transaction
712 * @hopcount: Number of hops to the device
714 * Used during enumeration to read the Host Device ID Lock CSR on a
715 * RIO device. Returns the value of the lock register.
717 static u16
rio_get_host_deviceid_lock(struct rio_mport
*port
, u8 hopcount
)
721 rio_mport_read_config_32(port
, RIO_ANY_DESTID(port
->sys_size
), hopcount
,
722 RIO_HOST_DID_LOCK_CSR
, &result
);
724 return (u16
) (result
& 0xffff);
728 * rio_enum_peer- Recursively enumerate a RIO network through a master port
729 * @net: RIO network being enumerated
730 * @port: Master port to send transactions
731 * @hopcount: Number of hops into the network
732 * @prev: Previous RIO device connected to the enumerated one
733 * @prev_port: Port on previous RIO device
735 * Recursively enumerates a RIO network. Transactions are sent via the
736 * master port passed in @port.
738 static int __devinit
rio_enum_peer(struct rio_net
*net
, struct rio_mport
*port
,
739 u8 hopcount
, struct rio_dev
*prev
, int prev_port
)
745 struct rio_dev
*rdev
;
750 if (rio_mport_chk_dev_access(port
,
751 RIO_ANY_DESTID(port
->sys_size
), hopcount
)) {
752 pr_debug("RIO: device access check failed\n");
756 if (rio_get_host_deviceid_lock(port
, hopcount
) == port
->host_deviceid
) {
757 pr_debug("RIO: PE already discovered by this host\n");
759 * Already discovered by this host. Add it as another
760 * link to the existing device.
762 rio_mport_read_config_32(port
, RIO_ANY_DESTID(port
->sys_size
),
763 hopcount
, RIO_COMPONENT_TAG_CSR
, ®val
);
766 rdev
= rio_get_comptag((regval
& 0xffff), NULL
);
768 if (rdev
&& prev
&& rio_is_switch(prev
)) {
769 pr_debug("RIO: redundant path to %s\n",
771 prev
->rswitch
->nextdev
[prev_port
] = rdev
;
778 /* Attempt to acquire device lock */
779 rio_mport_write_config_32(port
, RIO_ANY_DESTID(port
->sys_size
),
781 RIO_HOST_DID_LOCK_CSR
, port
->host_deviceid
);
782 while ((tmp
= rio_get_host_deviceid_lock(port
, hopcount
))
783 < port
->host_deviceid
) {
786 /* Attempt to acquire device lock again */
787 rio_mport_write_config_32(port
, RIO_ANY_DESTID(port
->sys_size
),
789 RIO_HOST_DID_LOCK_CSR
,
790 port
->host_deviceid
);
793 if (rio_get_host_deviceid_lock(port
, hopcount
) > port
->host_deviceid
) {
795 "RIO: PE locked by a higher priority host...retreating\n");
799 /* Setup new RIO device */
800 rdev
= rio_setup_device(net
, port
, RIO_ANY_DESTID(port
->sys_size
),
803 /* Add device to the global and bus/net specific list. */
804 list_add_tail(&rdev
->net_list
, &net
->devices
);
806 if (prev
&& rio_is_switch(prev
))
807 prev
->rswitch
->nextdev
[prev_port
] = rdev
;
811 if (rio_is_switch(rdev
)) {
813 sw_inport
= RIO_GET_PORT_NUM(rdev
->swpinfo
);
814 rio_route_add_entry(port
, rdev
->rswitch
, RIO_GLOBAL_TABLE
,
815 port
->host_deviceid
, sw_inport
, 0);
816 rdev
->rswitch
->route_table
[port
->host_deviceid
] = sw_inport
;
818 for (destid
= 0; destid
< next_destid
; destid
++) {
819 if (destid
== port
->host_deviceid
)
821 rio_route_add_entry(port
, rdev
->rswitch
, RIO_GLOBAL_TABLE
,
822 destid
, sw_inport
, 0);
823 rdev
->rswitch
->route_table
[destid
] = sw_inport
;
827 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
828 rio_name(rdev
), rdev
->vid
, rdev
->did
,
829 RIO_GET_TOTAL_PORTS(rdev
->swpinfo
));
830 sw_destid
= next_destid
;
832 port_num
< RIO_GET_TOTAL_PORTS(rdev
->swpinfo
);
834 /*Enable Input Output Port (transmitter reviever)*/
835 rio_enable_rx_tx_port(port
, 0,
836 RIO_ANY_DESTID(port
->sys_size
),
839 if (sw_inport
== port_num
) {
840 rdev
->rswitch
->port_ok
|= (1 << port_num
);
844 cur_destid
= next_destid
;
846 if (rio_sport_is_active
847 (port
, RIO_ANY_DESTID(port
->sys_size
), hopcount
,
850 "RIO: scanning device on port %d\n",
852 rdev
->rswitch
->port_ok
|= (1 << port_num
);
853 rio_route_add_entry(port
, rdev
->rswitch
,
855 RIO_ANY_DESTID(port
->sys_size
),
858 if (rio_enum_peer(net
, port
, hopcount
+ 1,
862 /* Update routing tables */
863 if (next_destid
> cur_destid
) {
864 for (destid
= cur_destid
;
865 destid
< next_destid
; destid
++) {
866 if (destid
== port
->host_deviceid
)
868 rio_route_add_entry(port
, rdev
->rswitch
,
874 route_table
[destid
] =
879 /* If switch supports Error Management,
880 * set PORT_LOCKOUT bit for unused port
883 rio_set_port_lockout(rdev
, port_num
, 1);
885 rdev
->rswitch
->port_ok
&= ~(1 << port_num
);
889 /* Direct Port-write messages to the enumeratiing host */
890 if ((rdev
->src_ops
& RIO_SRC_OPS_PORT_WRITE
) &&
892 rio_write_config_32(rdev
,
893 rdev
->em_efptr
+ RIO_EM_PW_TGT_DEVID
,
894 (port
->host_deviceid
<< 16) |
895 (port
->sys_size
<< 15));
900 /* Check for empty switch */
901 if (next_destid
== sw_destid
) {
903 if (next_destid
== port
->host_deviceid
)
907 rdev
->rswitch
->destid
= sw_destid
;
909 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
910 rio_name(rdev
), rdev
->vid
, rdev
->did
);
916 * rio_enum_complete- Tests if enumeration of a network is complete
917 * @port: Master port to send transaction
919 * Tests the Component Tag CSR for non-zero value (enumeration
920 * complete flag). Return %1 if enumeration is complete or %0 if
921 * enumeration is incomplete.
923 static int rio_enum_complete(struct rio_mport
*port
)
927 rio_local_read_config_32(port
, port
->phys_efptr
+ RIO_PORT_GEN_CTL_CSR
,
929 return (regval
& RIO_PORT_GEN_MASTER
) ? 1 : 0;
933 * rio_disc_peer- Recursively discovers a RIO network through a master port
934 * @net: RIO network being discovered
935 * @port: Master port to send transactions
936 * @destid: Current destination ID in network
937 * @hopcount: Number of hops into the network
939 * Recursively discovers a RIO network. Transactions are sent via the
940 * master port passed in @port.
943 rio_disc_peer(struct rio_net
*net
, struct rio_mport
*port
, u16 destid
,
946 u8 port_num
, route_port
;
947 struct rio_dev
*rdev
;
950 /* Setup new RIO device */
951 if ((rdev
= rio_setup_device(net
, port
, destid
, hopcount
, 0))) {
952 /* Add device to the global and bus/net specific list. */
953 list_add_tail(&rdev
->net_list
, &net
->devices
);
957 if (rio_is_switch(rdev
)) {
960 /* Associated destid is how we accessed this switch */
961 rdev
->rswitch
->destid
= destid
;
964 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
965 rio_name(rdev
), rdev
->vid
, rdev
->did
,
966 RIO_GET_TOTAL_PORTS(rdev
->swpinfo
));
968 port_num
< RIO_GET_TOTAL_PORTS(rdev
->swpinfo
);
970 if (RIO_GET_PORT_NUM(rdev
->swpinfo
) == port_num
)
973 if (rio_sport_is_active
974 (port
, destid
, hopcount
, port_num
)) {
976 "RIO: scanning device on port %d\n",
979 rio_lock_device(port
, destid
, hopcount
, 1000);
982 ndestid
< RIO_ANY_DESTID(port
->sys_size
);
984 rio_route_get_entry(port
, rdev
->rswitch
,
988 if (route_port
== port_num
)
992 if (ndestid
== RIO_ANY_DESTID(port
->sys_size
))
994 rio_unlock_device(port
, destid
, hopcount
);
996 (net
, port
, ndestid
, hopcount
+ 1) < 0)
1001 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
1002 rio_name(rdev
), rdev
->vid
, rdev
->did
);
1008 * rio_mport_is_active- Tests if master port link is active
1009 * @port: Master port to test
1011 * Reads the port error status CSR for the master port to
1012 * determine if the port has an active link. Returns
1013 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
1014 * or %0 if it is inactive.
1016 static int rio_mport_is_active(struct rio_mport
*port
)
1020 int *entry
= rio_mport_phys_table
;
1024 rio_mport_get_feature(port
, 1, 0, 0, *entry
)))
1026 } while (*++entry
>= 0);
1029 rio_local_read_config_32(port
,
1031 RIO_PORT_N_ERR_STS_CSR(port
->index
),
1034 return result
& RIO_PORT_N_ERR_STS_PORT_OK
;
1038 * rio_alloc_net- Allocate and configure a new RIO network
1039 * @port: Master port associated with the RIO network
1041 * Allocates a RIO network structure, initializes per-network
1042 * list heads, and adds the associated master port to the
1043 * network list of associated master ports. Returns a
1044 * RIO network pointer on success or %NULL on failure.
1046 static struct rio_net __devinit
*rio_alloc_net(struct rio_mport
*port
)
1048 struct rio_net
*net
;
1050 net
= kzalloc(sizeof(struct rio_net
), GFP_KERNEL
);
1052 INIT_LIST_HEAD(&net
->node
);
1053 INIT_LIST_HEAD(&net
->devices
);
1054 INIT_LIST_HEAD(&net
->mports
);
1055 list_add_tail(&port
->nnode
, &net
->mports
);
1057 net
->id
= next_net
++;
1063 * rio_update_route_tables- Updates route tables in switches
1064 * @port: Master port associated with the RIO network
1066 * For each enumerated device, ensure that each switch in a system
1067 * has correct routing entries. Add routes for devices that where
1068 * unknown dirung the first enumeration pass through the switch.
1070 static void rio_update_route_tables(struct rio_mport
*port
)
1072 struct rio_dev
*rdev
;
1073 struct rio_switch
*rswitch
;
1077 list_for_each_entry(rdev
, &rio_devices
, global_list
) {
1079 destid
= (rio_is_switch(rdev
))?rdev
->rswitch
->destid
:rdev
->destid
;
1081 list_for_each_entry(rswitch
, &rio_switches
, node
) {
1083 if (rio_is_switch(rdev
) && (rdev
->rswitch
== rswitch
))
1086 if (RIO_INVALID_ROUTE
== rswitch
->route_table
[destid
]) {
1087 /* Skip if destid ends in empty switch*/
1088 if (rswitch
->destid
== destid
)
1091 sport
= RIO_GET_PORT_NUM(rswitch
->rdev
->swpinfo
);
1093 if (rswitch
->add_entry
) {
1094 rio_route_add_entry(port
, rswitch
,
1095 RIO_GLOBAL_TABLE
, destid
,
1097 rswitch
->route_table
[destid
] = sport
;
1105 * rio_init_em - Initializes RIO Error Management (for switches)
1108 * For each enumerated switch, call device-specific error management
1109 * initialization routine (if supplied by the switch driver).
1111 static void rio_init_em(struct rio_dev
*rdev
)
1113 if (rio_is_switch(rdev
) && (rdev
->em_efptr
) &&
1114 (rdev
->rswitch
->em_init
)) {
1115 rdev
->rswitch
->em_init(rdev
);
1120 * rio_pw_enable - Enables/disables port-write handling by a master port
1121 * @port: Master port associated with port-write handling
1122 * @enable: 1=enable, 0=disable
1124 static void rio_pw_enable(struct rio_mport
*port
, int enable
)
1126 if (port
->ops
->pwenable
)
1127 port
->ops
->pwenable(port
, enable
);
1131 * rio_enum_mport- Start enumeration through a master port
1132 * @mport: Master port to send transactions
1134 * Starts the enumeration process. If somebody has enumerated our
1135 * master port device, then give up. If not and we have an active
1136 * link, then start recursive peer enumeration. Returns %0 if
1137 * enumeration succeeds or %-EBUSY if enumeration fails.
1139 int __devinit
rio_enum_mport(struct rio_mport
*mport
)
1141 struct rio_net
*net
= NULL
;
1144 printk(KERN_INFO
"RIO: enumerate master port %d, %s\n", mport
->id
,
1146 /* If somebody else enumerated our master port device, bail. */
1147 if (rio_enum_host(mport
) < 0) {
1149 "RIO: master port %d device has been enumerated by a remote host\n",
1155 /* If master port has an active link, allocate net and enum peers */
1156 if (rio_mport_is_active(mport
)) {
1157 if (!(net
= rio_alloc_net(mport
))) {
1158 printk(KERN_ERR
"RIO: failed to allocate new net\n");
1163 /* Enable Input Output Port (transmitter reviever) */
1164 rio_enable_rx_tx_port(mport
, 1, 0, 0, 0);
1166 /* Set component tag for host */
1167 rio_local_write_config_32(mport
, RIO_COMPONENT_TAG_CSR
,
1170 if (rio_enum_peer(net
, mport
, 0, NULL
, 0) < 0) {
1171 /* A higher priority host won enumeration, bail. */
1173 "RIO: master port %d device has lost enumeration to a remote host\n",
1175 rio_clear_locks(mport
);
1179 rio_update_route_tables(mport
);
1180 rio_clear_locks(mport
);
1181 rio_pw_enable(mport
, 1);
1183 printk(KERN_INFO
"RIO: master port %d link inactive\n",
1193 * rio_build_route_tables- Generate route tables from switch route entries
1195 * For each switch device, generate a route table by copying existing
1196 * route entries from the switch.
1198 static void rio_build_route_tables(void)
1200 struct rio_dev
*rdev
;
1204 list_for_each_entry(rdev
, &rio_devices
, global_list
)
1205 if (rio_is_switch(rdev
)) {
1206 rio_lock_device(rdev
->net
->hport
, rdev
->rswitch
->destid
,
1207 rdev
->rswitch
->hopcount
, 1000);
1209 i
< RIO_MAX_ROUTE_ENTRIES(rdev
->net
->hport
->sys_size
);
1211 if (rio_route_get_entry
1212 (rdev
->net
->hport
, rdev
->rswitch
,
1213 RIO_GLOBAL_TABLE
, i
, &sport
, 0) < 0)
1215 rdev
->rswitch
->route_table
[i
] = sport
;
1218 rio_unlock_device(rdev
->net
->hport
,
1219 rdev
->rswitch
->destid
,
1220 rdev
->rswitch
->hopcount
);
1225 * rio_enum_timeout- Signal that enumeration timed out
1226 * @data: Address of timeout flag.
1228 * When the enumeration complete timer expires, set a flag that
1229 * signals to the discovery process that enumeration did not
1230 * complete in a sane amount of time.
1232 static void rio_enum_timeout(unsigned long data
)
1234 /* Enumeration timed out, set flag */
1239 * rio_disc_mport- Start discovery through a master port
1240 * @mport: Master port to send transactions
1242 * Starts the discovery process. If we have an active link,
1243 * then wait for the signal that enumeration is complete.
1244 * When enumeration completion is signaled, start recursive
1245 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1248 int __devinit
rio_disc_mport(struct rio_mport
*mport
)
1250 struct rio_net
*net
= NULL
;
1251 int enum_timeout_flag
= 0;
1253 printk(KERN_INFO
"RIO: discover master port %d, %s\n", mport
->id
,
1256 /* If master port has an active link, allocate net and discover peers */
1257 if (rio_mport_is_active(mport
)) {
1258 if (!(net
= rio_alloc_net(mport
))) {
1259 printk(KERN_ERR
"RIO: Failed to allocate new net\n");
1263 pr_debug("RIO: wait for enumeration complete...");
1265 rio_enum_timer
.expires
=
1266 jiffies
+ CONFIG_RAPIDIO_DISC_TIMEOUT
* HZ
;
1267 rio_enum_timer
.data
= (unsigned long)&enum_timeout_flag
;
1268 add_timer(&rio_enum_timer
);
1269 while (!rio_enum_complete(mport
)) {
1271 if (enum_timeout_flag
) {
1272 del_timer_sync(&rio_enum_timer
);
1276 del_timer_sync(&rio_enum_timer
);
1280 /* Read DestID assigned by enumerator */
1281 rio_local_read_config_32(mport
, RIO_DID_CSR
,
1282 &mport
->host_deviceid
);
1283 mport
->host_deviceid
= RIO_GET_DID(mport
->sys_size
,
1284 mport
->host_deviceid
);
1286 if (rio_disc_peer(net
, mport
, RIO_ANY_DESTID(mport
->sys_size
),
1289 "RIO: master port %d device has failed discovery\n",
1294 rio_build_route_tables();
1300 pr_debug("timeout\n");