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
;
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 /* Assign component tag to all devices */
126 rio_local_write_config_32(port
, RIO_COMPONENT_TAG_CSR
, next_comptag
++);
128 list_for_each_entry(rdev
, &rio_devices
, global_list
) {
129 /* Mark device as discovered */
130 rio_read_config_32(rdev
,
131 rdev
->phys_efptr
+ RIO_PORT_GEN_CTL_CSR
,
133 rio_write_config_32(rdev
,
134 rdev
->phys_efptr
+ RIO_PORT_GEN_CTL_CSR
,
135 result
| RIO_PORT_GEN_DISCOVERED
);
137 rio_write_config_32(rdev
, RIO_COMPONENT_TAG_CSR
, next_comptag
);
138 rdev
->comp_tag
= next_comptag
++;
139 if (next_comptag
>= 0x10000) {
140 pr_err("RIO: Component Tag Counter Overflow\n");
145 /* Release host device id locks */
146 rio_local_write_config_32(port
, RIO_HOST_DID_LOCK_CSR
,
147 port
->host_deviceid
);
148 rio_local_read_config_32(port
, RIO_HOST_DID_LOCK_CSR
, &result
);
149 if ((result
& 0xffff) != 0xffff) {
151 "RIO: badness when releasing host lock on master port, result %8.8x\n",
155 list_for_each_entry(rdev
, &rio_devices
, global_list
) {
156 rio_write_config_32(rdev
, RIO_HOST_DID_LOCK_CSR
,
157 port
->host_deviceid
);
158 rio_read_config_32(rdev
, RIO_HOST_DID_LOCK_CSR
, &result
);
159 if ((result
& 0xffff) != 0xffff) {
161 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
162 rdev
->vid
, rdev
->did
);
171 * rio_enum_host- Set host lock and initialize host destination ID
172 * @port: Master port to issue transaction
174 * Sets the local host master port lock and destination ID register
175 * with the host device ID value. The host device ID value is provided
176 * by the platform. Returns %0 on success or %-1 on failure.
178 static int rio_enum_host(struct rio_mport
*port
)
182 /* Set master port host device id lock */
183 rio_local_write_config_32(port
, RIO_HOST_DID_LOCK_CSR
,
184 port
->host_deviceid
);
186 rio_local_read_config_32(port
, RIO_HOST_DID_LOCK_CSR
, &result
);
187 if ((result
& 0xffff) != port
->host_deviceid
)
190 /* Set master port destid and init destid ctr */
191 rio_local_set_device_id(port
, port
->host_deviceid
);
193 if (next_destid
== port
->host_deviceid
)
200 * rio_device_has_destid- Test if a device contains a destination ID register
201 * @port: Master port to issue transaction
202 * @src_ops: RIO device source operations
203 * @dst_ops: RIO device destination operations
205 * Checks the provided @src_ops and @dst_ops for the necessary transaction
206 * capabilities that indicate whether or not a device will implement a
207 * destination ID register. Returns 1 if true or 0 if false.
209 static int rio_device_has_destid(struct rio_mport
*port
, int src_ops
,
212 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
;
214 return !!((src_ops
| dst_ops
) & mask
);
218 * rio_release_dev- Frees a RIO device struct
219 * @dev: LDM device associated with a RIO device struct
221 * Gets the RIO device struct associated a RIO device struct.
222 * The RIO device struct is freed.
224 static void rio_release_dev(struct device
*dev
)
226 struct rio_dev
*rdev
;
228 rdev
= to_rio_dev(dev
);
233 * rio_is_switch- Tests if a RIO device has switch capabilities
236 * Gets the RIO device Processing Element Features register
237 * contents and tests for switch capabilities. Returns 1 if
238 * the device is a switch or 0 if it is not a switch.
239 * The RIO device struct is freed.
241 static int rio_is_switch(struct rio_dev
*rdev
)
243 if (rdev
->pef
& RIO_PEF_SWITCH
)
249 * rio_switch_init - Sets switch operations for a particular vendor switch
251 * @do_enum: Enumeration/Discovery mode flag
253 * Searches the RIO switch ops table for known switch types. If the vid
254 * and did match a switch table entry, then call switch initialization
255 * routine to setup switch-specific routines.
257 static void rio_switch_init(struct rio_dev
*rdev
, int do_enum
)
259 struct rio_switch_ops
*cur
= __start_rio_switch_ops
;
260 struct rio_switch_ops
*end
= __end_rio_switch_ops
;
263 if ((cur
->vid
== rdev
->vid
) && (cur
->did
== rdev
->did
)) {
264 pr_debug("RIO: calling init routine for %s\n",
266 cur
->init_hook(rdev
, do_enum
);
272 if ((cur
>= end
) && (rdev
->pef
& RIO_PEF_STD_RT
)) {
273 pr_debug("RIO: adding STD routing ops for %s\n",
275 rdev
->rswitch
->add_entry
= rio_std_route_add_entry
;
276 rdev
->rswitch
->get_entry
= rio_std_route_get_entry
;
277 rdev
->rswitch
->clr_table
= rio_std_route_clr_table
;
280 if (!rdev
->rswitch
->add_entry
|| !rdev
->rswitch
->get_entry
)
281 printk(KERN_ERR
"RIO: missing routing ops for %s\n",
286 * rio_add_device- Adds a RIO device to the device model
289 * Adds the RIO device to the global device list and adds the RIO
290 * device to the RIO device list. Creates the generic sysfs nodes
293 static int __devinit
rio_add_device(struct rio_dev
*rdev
)
297 err
= device_add(&rdev
->dev
);
301 spin_lock(&rio_global_list_lock
);
302 list_add_tail(&rdev
->global_list
, &rio_devices
);
303 spin_unlock(&rio_global_list_lock
);
305 rio_create_sysfs_dev_files(rdev
);
311 * rio_enable_rx_tx_port - enable input reciever and output transmitter of
313 * @port: Master port associated with the RIO network
314 * @local: local=1 select local port otherwise a far device is reached
315 * @destid: Destination ID of the device to check host bit
316 * @hopcount: Number of hops to reach the target
317 * @port_num: Port (-number on switch) to enable on a far end device
319 * Returns 0 or 1 from on General Control Command and Status Register
322 inline int rio_enable_rx_tx_port(struct rio_mport
*port
,
323 int local
, u16 destid
,
324 u8 hopcount
, u8 port_num
) {
325 #ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
330 * enable rx input tx output port
332 pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
333 "%d, port_num = %d)\n", local
, destid
, hopcount
, port_num
);
335 ext_ftr_ptr
= rio_mport_get_physefb(port
, local
, destid
, hopcount
);
338 rio_local_read_config_32(port
, ext_ftr_ptr
+
339 RIO_PORT_N_CTL_CSR(0),
342 if (rio_mport_read_config_32(port
, destid
, hopcount
,
343 ext_ftr_ptr
+ RIO_PORT_N_CTL_CSR(port_num
), ®val
) < 0)
347 if (regval
& RIO_PORT_N_CTL_P_TYP_SER
) {
349 regval
= regval
| RIO_PORT_N_CTL_EN_RX_SER
350 | RIO_PORT_N_CTL_EN_TX_SER
;
353 regval
= regval
| RIO_PORT_N_CTL_EN_RX_PAR
354 | RIO_PORT_N_CTL_EN_TX_PAR
;
358 rio_local_write_config_32(port
, ext_ftr_ptr
+
359 RIO_PORT_N_CTL_CSR(0), regval
);
361 if (rio_mport_write_config_32(port
, destid
, hopcount
,
362 ext_ftr_ptr
+ RIO_PORT_N_CTL_CSR(port_num
), regval
) < 0)
370 * rio_setup_device- Allocates and sets up a RIO device
372 * @port: Master port to send transactions
373 * @destid: Current destination ID
374 * @hopcount: Current hopcount
375 * @do_enum: Enumeration/Discovery mode flag
377 * Allocates a RIO device and configures fields based on configuration
378 * space contents. If device has a destination ID register, a destination
379 * ID is either assigned in enumeration mode or read from configuration
380 * space in discovery mode. If the device has switch capabilities, then
381 * a switch is allocated and configured appropriately. Returns a pointer
382 * to a RIO device on success or NULL on failure.
385 static struct rio_dev __devinit
*rio_setup_device(struct rio_net
*net
,
386 struct rio_mport
*port
, u16 destid
,
387 u8 hopcount
, int do_enum
)
390 struct rio_dev
*rdev
;
391 struct rio_switch
*rswitch
= NULL
;
394 rdev
= kzalloc(sizeof(struct rio_dev
), GFP_KERNEL
);
399 rio_mport_read_config_32(port
, destid
, hopcount
, RIO_DEV_ID_CAR
,
401 rdev
->did
= result
>> 16;
402 rdev
->vid
= result
& 0xffff;
403 rio_mport_read_config_32(port
, destid
, hopcount
, RIO_DEV_INFO_CAR
,
405 rio_mport_read_config_32(port
, destid
, hopcount
, RIO_ASM_ID_CAR
,
407 rdev
->asm_did
= result
>> 16;
408 rdev
->asm_vid
= result
& 0xffff;
409 rio_mport_read_config_32(port
, destid
, hopcount
, RIO_ASM_INFO_CAR
,
411 rdev
->asm_rev
= result
>> 16;
412 rio_mport_read_config_32(port
, destid
, hopcount
, RIO_PEF_CAR
,
414 if (rdev
->pef
& RIO_PEF_EXT_FEATURES
) {
415 rdev
->efptr
= result
& 0xffff;
416 rdev
->phys_efptr
= rio_mport_get_physefb(port
, 0, destid
,
419 rdev
->em_efptr
= rio_mport_get_feature(port
, 0, destid
,
420 hopcount
, RIO_EFB_ERR_MGMNT
);
423 if (rdev
->pef
& (RIO_PEF_SWITCH
| RIO_PEF_MULTIPORT
)) {
424 rio_mport_read_config_32(port
, destid
, hopcount
,
425 RIO_SWP_INFO_CAR
, &rdev
->swpinfo
);
428 rio_mport_read_config_32(port
, destid
, hopcount
, RIO_SRC_OPS_CAR
,
430 rio_mport_read_config_32(port
, destid
, hopcount
, RIO_DST_OPS_CAR
,
433 if (rio_device_has_destid(port
, rdev
->src_ops
, rdev
->dst_ops
)) {
435 rio_set_device_id(port
, destid
, hopcount
, next_destid
);
436 rdev
->destid
= next_destid
++;
437 if (next_destid
== port
->host_deviceid
)
440 rdev
->destid
= rio_get_device_id(port
, destid
, hopcount
);
442 /* Switch device has an associated destID */
443 rdev
->destid
= RIO_INVALID_DESTID
;
445 /* If a PE has both switch and other functions, show it as a switch */
446 if (rio_is_switch(rdev
)) {
447 rswitch
= kzalloc(sizeof(*rswitch
) +
448 RIO_GET_TOTAL_PORTS(rdev
->swpinfo
) *
449 sizeof(rswitch
->nextdev
[0]),
453 rswitch
->switchid
= next_switchid
;
454 rswitch
->hopcount
= hopcount
;
455 rswitch
->destid
= destid
;
456 rswitch
->port_ok
= 0;
457 rswitch
->route_table
= kzalloc(sizeof(u8
)*
458 RIO_MAX_ROUTE_ENTRIES(port
->sys_size
),
460 if (!rswitch
->route_table
)
462 /* Initialize switch route table */
463 for (rdid
= 0; rdid
< RIO_MAX_ROUTE_ENTRIES(port
->sys_size
);
465 rswitch
->route_table
[rdid
] = RIO_INVALID_ROUTE
;
466 rdev
->rswitch
= rswitch
;
467 rswitch
->rdev
= rdev
;
468 dev_set_name(&rdev
->dev
, "%02x:s:%04x", rdev
->net
->id
,
469 rdev
->rswitch
->switchid
);
470 rio_switch_init(rdev
, do_enum
);
472 if (do_enum
&& rdev
->rswitch
->clr_table
)
473 rdev
->rswitch
->clr_table(port
, destid
, hopcount
,
476 list_add_tail(&rswitch
->node
, &rio_switches
);
480 /*Enable Input Output Port (transmitter reviever)*/
481 rio_enable_rx_tx_port(port
, 0, destid
, hopcount
, 0);
483 dev_set_name(&rdev
->dev
, "%02x:e:%04x", rdev
->net
->id
,
487 rdev
->dev
.bus
= &rio_bus_type
;
488 rdev
->dev
.parent
= &rio_bus
;
490 device_initialize(&rdev
->dev
);
491 rdev
->dev
.release
= rio_release_dev
;
494 rdev
->dma_mask
= DMA_BIT_MASK(32);
495 rdev
->dev
.dma_mask
= &rdev
->dma_mask
;
496 rdev
->dev
.coherent_dma_mask
= DMA_BIT_MASK(32);
498 if ((rdev
->pef
& RIO_PEF_INB_DOORBELL
) &&
499 (rdev
->dst_ops
& RIO_DST_OPS_DOORBELL
))
500 rio_init_dbell_res(&rdev
->riores
[RIO_DOORBELL_RESOURCE
],
503 ret
= rio_add_device(rdev
);
511 kfree(rswitch
->route_table
);
519 * rio_sport_is_active- Tests if a switch port has an active connection.
520 * @port: Master port to send transaction
521 * @destid: Associated destination ID for switch
522 * @hopcount: Hopcount to reach switch
523 * @sport: Switch port number
525 * Reads the port error status CSR for a particular switch port to
526 * determine if the port has an active link. Returns
527 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
531 rio_sport_is_active(struct rio_mport
*port
, u16 destid
, u8 hopcount
, int sport
)
536 ext_ftr_ptr
= rio_mport_get_efb(port
, 0, destid
, hopcount
, 0);
538 while (ext_ftr_ptr
) {
539 rio_mport_read_config_32(port
, destid
, hopcount
,
540 ext_ftr_ptr
, &result
);
541 result
= RIO_GET_BLOCK_ID(result
);
542 if ((result
== RIO_EFB_SER_EP_FREE_ID
) ||
543 (result
== RIO_EFB_SER_EP_FREE_ID_V13P
) ||
544 (result
== RIO_EFB_SER_EP_FREC_ID
))
547 ext_ftr_ptr
= rio_mport_get_efb(port
, 0, destid
, hopcount
,
552 rio_mport_read_config_32(port
, destid
, hopcount
,
554 RIO_PORT_N_ERR_STS_CSR(sport
),
557 return result
& RIO_PORT_N_ERR_STS_PORT_OK
;
561 * rio_lock_device - Acquires host device lock for specified device
562 * @port: Master port to send transaction
563 * @destid: Destination ID for device/switch
564 * @hopcount: Hopcount to reach switch
565 * @wait_ms: Max wait time in msec (0 = no timeout)
567 * Attepts to acquire host device lock for specified device
568 * Returns 0 if device lock acquired or EINVAL if timeout expires.
571 rio_lock_device(struct rio_mport
*port
, u16 destid
, u8 hopcount
, int wait_ms
)
576 /* Attempt to acquire device lock */
577 rio_mport_write_config_32(port
, destid
, hopcount
,
578 RIO_HOST_DID_LOCK_CSR
, port
->host_deviceid
);
579 rio_mport_read_config_32(port
, destid
, hopcount
,
580 RIO_HOST_DID_LOCK_CSR
, &result
);
582 while (result
!= port
->host_deviceid
) {
583 if (wait_ms
!= 0 && tcnt
== wait_ms
) {
584 pr_debug("RIO: timeout when locking device %x:%x\n",
592 /* Try to acquire device lock again */
593 rio_mport_write_config_32(port
, destid
,
595 RIO_HOST_DID_LOCK_CSR
,
596 port
->host_deviceid
);
597 rio_mport_read_config_32(port
, destid
,
599 RIO_HOST_DID_LOCK_CSR
, &result
);
606 * rio_unlock_device - Releases host device lock for specified device
607 * @port: Master port to send transaction
608 * @destid: Destination ID for device/switch
609 * @hopcount: Hopcount to reach switch
611 * Returns 0 if device lock released or EINVAL if fails.
614 rio_unlock_device(struct rio_mport
*port
, u16 destid
, u8 hopcount
)
618 /* Release device lock */
619 rio_mport_write_config_32(port
, destid
,
621 RIO_HOST_DID_LOCK_CSR
,
622 port
->host_deviceid
);
623 rio_mport_read_config_32(port
, destid
, hopcount
,
624 RIO_HOST_DID_LOCK_CSR
, &result
);
625 if ((result
& 0xffff) != 0xffff) {
626 pr_debug("RIO: badness when releasing device lock %x:%x\n",
635 * rio_route_add_entry- Add a route entry to a switch routing table
636 * @mport: Master port to send transaction
637 * @rswitch: Switch device
638 * @table: Routing table ID
639 * @route_destid: Destination ID to be routed
640 * @route_port: Port number to be routed
641 * @lock: lock switch device flag
643 * Calls the switch specific add_entry() method to add a route entry
644 * on a switch. The route table can be specified using the @table
645 * argument if a switch has per port routing tables or the normal
646 * use is to specific all tables (or the global table) by passing
647 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
651 rio_route_add_entry(struct rio_mport
*mport
, struct rio_switch
*rswitch
,
652 u16 table
, u16 route_destid
, u8 route_port
, int lock
)
657 rc
= rio_lock_device(mport
, rswitch
->destid
,
658 rswitch
->hopcount
, 1000);
663 rc
= rswitch
->add_entry(mport
, rswitch
->destid
,
664 rswitch
->hopcount
, table
,
665 route_destid
, route_port
);
667 rio_unlock_device(mport
, rswitch
->destid
, rswitch
->hopcount
);
673 * rio_route_get_entry- Read a route entry in a switch routing table
674 * @mport: Master port to send transaction
675 * @rswitch: Switch device
676 * @table: Routing table ID
677 * @route_destid: Destination ID to be routed
678 * @route_port: Pointer to read port number into
679 * @lock: lock switch device flag
681 * Calls the switch specific get_entry() method to read a route entry
682 * in a switch. The route table can be specified using the @table
683 * argument if a switch has per port routing tables or the normal
684 * use is to specific all tables (or the global table) by passing
685 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
689 rio_route_get_entry(struct rio_mport
*mport
, struct rio_switch
*rswitch
, u16 table
,
690 u16 route_destid
, u8
*route_port
, int lock
)
695 rc
= rio_lock_device(mport
, rswitch
->destid
,
696 rswitch
->hopcount
, 1000);
701 rc
= rswitch
->get_entry(mport
, rswitch
->destid
,
702 rswitch
->hopcount
, table
,
703 route_destid
, route_port
);
705 rio_unlock_device(mport
, rswitch
->destid
, rswitch
->hopcount
);
711 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
712 * @port: Master port to send transaction
713 * @hopcount: Number of hops to the device
715 * Used during enumeration to read the Host Device ID Lock CSR on a
716 * RIO device. Returns the value of the lock register.
718 static u16
rio_get_host_deviceid_lock(struct rio_mport
*port
, u8 hopcount
)
722 rio_mport_read_config_32(port
, RIO_ANY_DESTID(port
->sys_size
), hopcount
,
723 RIO_HOST_DID_LOCK_CSR
, &result
);
725 return (u16
) (result
& 0xffff);
729 * rio_net_add_mport- Add a master port to a RIO network
731 * @port: Master port to add
733 * Adds a master port to the network list of associated master
736 static void rio_net_add_mport(struct rio_net
*net
, struct rio_mport
*port
)
738 spin_lock(&rio_global_list_lock
);
739 list_add_tail(&port
->nnode
, &net
->mports
);
740 spin_unlock(&rio_global_list_lock
);
744 * rio_enum_peer- Recursively enumerate a RIO network through a master port
745 * @net: RIO network being enumerated
746 * @port: Master port to send transactions
747 * @hopcount: Number of hops into the network
748 * @prev: Previous RIO device connected to the enumerated one
749 * @prev_port: Port on previous RIO device
751 * Recursively enumerates a RIO network. Transactions are sent via the
752 * master port passed in @port.
754 static int __devinit
rio_enum_peer(struct rio_net
*net
, struct rio_mport
*port
,
755 u8 hopcount
, struct rio_dev
*prev
, int prev_port
)
761 struct rio_dev
*rdev
;
765 if (rio_get_host_deviceid_lock(port
, hopcount
) == port
->host_deviceid
) {
766 pr_debug("RIO: PE already discovered by this host\n");
768 * Already discovered by this host. Add it as another
769 * master port for the current network.
771 rio_net_add_mport(net
, port
);
775 /* Attempt to acquire device lock */
776 rio_mport_write_config_32(port
, RIO_ANY_DESTID(port
->sys_size
),
778 RIO_HOST_DID_LOCK_CSR
, port
->host_deviceid
);
779 while ((tmp
= rio_get_host_deviceid_lock(port
, hopcount
))
780 < port
->host_deviceid
) {
783 /* Attempt to acquire device lock again */
784 rio_mport_write_config_32(port
, RIO_ANY_DESTID(port
->sys_size
),
786 RIO_HOST_DID_LOCK_CSR
,
787 port
->host_deviceid
);
790 if (rio_get_host_deviceid_lock(port
, hopcount
) > port
->host_deviceid
) {
792 "RIO: PE locked by a higher priority host...retreating\n");
796 /* Setup new RIO device */
797 rdev
= rio_setup_device(net
, port
, RIO_ANY_DESTID(port
->sys_size
),
800 /* Add device to the global and bus/net specific list. */
801 list_add_tail(&rdev
->net_list
, &net
->devices
);
803 if (prev
&& rio_is_switch(prev
))
804 prev
->rswitch
->nextdev
[prev_port
] = rdev
;
808 if (rio_is_switch(rdev
)) {
810 sw_inport
= RIO_GET_PORT_NUM(rdev
->swpinfo
);
811 rio_route_add_entry(port
, rdev
->rswitch
, RIO_GLOBAL_TABLE
,
812 port
->host_deviceid
, sw_inport
, 0);
813 rdev
->rswitch
->route_table
[port
->host_deviceid
] = sw_inport
;
815 for (destid
= 0; destid
< next_destid
; destid
++) {
816 if (destid
== port
->host_deviceid
)
818 rio_route_add_entry(port
, rdev
->rswitch
, RIO_GLOBAL_TABLE
,
819 destid
, sw_inport
, 0);
820 rdev
->rswitch
->route_table
[destid
] = sw_inport
;
824 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
825 rio_name(rdev
), rdev
->vid
, rdev
->did
,
826 RIO_GET_TOTAL_PORTS(rdev
->swpinfo
));
827 sw_destid
= next_destid
;
829 port_num
< RIO_GET_TOTAL_PORTS(rdev
->swpinfo
);
831 /*Enable Input Output Port (transmitter reviever)*/
832 rio_enable_rx_tx_port(port
, 0,
833 RIO_ANY_DESTID(port
->sys_size
),
836 if (sw_inport
== port_num
) {
837 rdev
->rswitch
->port_ok
|= (1 << port_num
);
841 cur_destid
= next_destid
;
843 if (rio_sport_is_active
844 (port
, RIO_ANY_DESTID(port
->sys_size
), hopcount
,
847 "RIO: scanning device on port %d\n",
849 rdev
->rswitch
->port_ok
|= (1 << port_num
);
850 rio_route_add_entry(port
, rdev
->rswitch
,
852 RIO_ANY_DESTID(port
->sys_size
),
855 if (rio_enum_peer(net
, port
, hopcount
+ 1,
859 /* Update routing tables */
860 if (next_destid
> cur_destid
) {
861 for (destid
= cur_destid
;
862 destid
< next_destid
; destid
++) {
863 if (destid
== port
->host_deviceid
)
865 rio_route_add_entry(port
, rdev
->rswitch
,
871 route_table
[destid
] =
876 /* If switch supports Error Management,
877 * set PORT_LOCKOUT bit for unused port
880 rio_set_port_lockout(rdev
, port_num
, 1);
882 rdev
->rswitch
->port_ok
&= ~(1 << port_num
);
886 /* Direct Port-write messages to the enumeratiing host */
887 if ((rdev
->src_ops
& RIO_SRC_OPS_PORT_WRITE
) &&
889 rio_write_config_32(rdev
,
890 rdev
->em_efptr
+ RIO_EM_PW_TGT_DEVID
,
891 (port
->host_deviceid
<< 16) |
892 (port
->sys_size
<< 15));
897 /* Check for empty switch */
898 if (next_destid
== sw_destid
) {
900 if (next_destid
== port
->host_deviceid
)
904 rdev
->rswitch
->destid
= sw_destid
;
906 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
907 rio_name(rdev
), rdev
->vid
, rdev
->did
);
913 * rio_enum_complete- Tests if enumeration of a network is complete
914 * @port: Master port to send transaction
916 * Tests the Component Tag CSR for non-zero value (enumeration
917 * complete flag). Return %1 if enumeration is complete or %0 if
918 * enumeration is incomplete.
920 static int rio_enum_complete(struct rio_mport
*port
)
924 rio_local_read_config_32(port
, RIO_COMPONENT_TAG_CSR
, &tag_csr
);
925 return (tag_csr
& 0xffff) ? 1 : 0;
929 * rio_disc_peer- Recursively discovers a RIO network through a master port
930 * @net: RIO network being discovered
931 * @port: Master port to send transactions
932 * @destid: Current destination ID in network
933 * @hopcount: Number of hops into the network
935 * Recursively discovers a RIO network. Transactions are sent via the
936 * master port passed in @port.
939 rio_disc_peer(struct rio_net
*net
, struct rio_mport
*port
, u16 destid
,
942 u8 port_num
, route_port
;
943 struct rio_dev
*rdev
;
946 /* Setup new RIO device */
947 if ((rdev
= rio_setup_device(net
, port
, destid
, hopcount
, 0))) {
948 /* Add device to the global and bus/net specific list. */
949 list_add_tail(&rdev
->net_list
, &net
->devices
);
953 if (rio_is_switch(rdev
)) {
956 /* Associated destid is how we accessed this switch */
957 rdev
->rswitch
->destid
= destid
;
960 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
961 rio_name(rdev
), rdev
->vid
, rdev
->did
,
962 RIO_GET_TOTAL_PORTS(rdev
->swpinfo
));
964 port_num
< RIO_GET_TOTAL_PORTS(rdev
->swpinfo
);
966 if (RIO_GET_PORT_NUM(rdev
->swpinfo
) == port_num
)
969 if (rio_sport_is_active
970 (port
, destid
, hopcount
, port_num
)) {
972 "RIO: scanning device on port %d\n",
975 rio_lock_device(port
, destid
, hopcount
, 1000);
978 ndestid
< RIO_ANY_DESTID(port
->sys_size
);
980 rio_route_get_entry(port
, rdev
->rswitch
,
984 if (route_port
== port_num
)
988 rio_unlock_device(port
, destid
, hopcount
);
990 (net
, port
, ndestid
, hopcount
+ 1) < 0)
995 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
996 rio_name(rdev
), rdev
->vid
, rdev
->did
);
1002 * rio_mport_is_active- Tests if master port link is active
1003 * @port: Master port to test
1005 * Reads the port error status CSR for the master port to
1006 * determine if the port has an active link. Returns
1007 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
1008 * or %0 if it is inactive.
1010 static int rio_mport_is_active(struct rio_mport
*port
)
1014 int *entry
= rio_mport_phys_table
;
1018 rio_mport_get_feature(port
, 1, 0, 0, *entry
)))
1020 } while (*++entry
>= 0);
1023 rio_local_read_config_32(port
,
1025 RIO_PORT_N_ERR_STS_CSR(port
->index
),
1028 return result
& RIO_PORT_N_ERR_STS_PORT_OK
;
1032 * rio_alloc_net- Allocate and configure a new RIO network
1033 * @port: Master port associated with the RIO network
1035 * Allocates a RIO network structure, initializes per-network
1036 * list heads, and adds the associated master port to the
1037 * network list of associated master ports. Returns a
1038 * RIO network pointer on success or %NULL on failure.
1040 static struct rio_net __devinit
*rio_alloc_net(struct rio_mport
*port
)
1042 struct rio_net
*net
;
1044 net
= kzalloc(sizeof(struct rio_net
), GFP_KERNEL
);
1046 INIT_LIST_HEAD(&net
->node
);
1047 INIT_LIST_HEAD(&net
->devices
);
1048 INIT_LIST_HEAD(&net
->mports
);
1049 list_add_tail(&port
->nnode
, &net
->mports
);
1051 net
->id
= next_net
++;
1057 * rio_update_route_tables- Updates route tables in switches
1058 * @port: Master port associated with the RIO network
1060 * For each enumerated device, ensure that each switch in a system
1061 * has correct routing entries. Add routes for devices that where
1062 * unknown dirung the first enumeration pass through the switch.
1064 static void rio_update_route_tables(struct rio_mport
*port
)
1066 struct rio_dev
*rdev
;
1067 struct rio_switch
*rswitch
;
1071 list_for_each_entry(rdev
, &rio_devices
, global_list
) {
1073 destid
= (rio_is_switch(rdev
))?rdev
->rswitch
->destid
:rdev
->destid
;
1075 list_for_each_entry(rswitch
, &rio_switches
, node
) {
1077 if (rio_is_switch(rdev
) && (rdev
->rswitch
== rswitch
))
1080 if (RIO_INVALID_ROUTE
== rswitch
->route_table
[destid
]) {
1081 /* Skip if destid ends in empty switch*/
1082 if (rswitch
->destid
== destid
)
1085 sport
= RIO_GET_PORT_NUM(rswitch
->rdev
->swpinfo
);
1087 if (rswitch
->add_entry
) {
1088 rio_route_add_entry(port
, rswitch
,
1089 RIO_GLOBAL_TABLE
, destid
,
1091 rswitch
->route_table
[destid
] = sport
;
1099 * rio_init_em - Initializes RIO Error Management (for switches)
1102 * For each enumerated switch, call device-specific error management
1103 * initialization routine (if supplied by the switch driver).
1105 static void rio_init_em(struct rio_dev
*rdev
)
1107 if (rio_is_switch(rdev
) && (rdev
->em_efptr
) &&
1108 (rdev
->rswitch
->em_init
)) {
1109 rdev
->rswitch
->em_init(rdev
);
1114 * rio_pw_enable - Enables/disables port-write handling by a master port
1115 * @port: Master port associated with port-write handling
1116 * @enable: 1=enable, 0=disable
1118 static void rio_pw_enable(struct rio_mport
*port
, int enable
)
1120 if (port
->ops
->pwenable
)
1121 port
->ops
->pwenable(port
, enable
);
1125 * rio_enum_mport- Start enumeration through a master port
1126 * @mport: Master port to send transactions
1128 * Starts the enumeration process. If somebody has enumerated our
1129 * master port device, then give up. If not and we have an active
1130 * link, then start recursive peer enumeration. Returns %0 if
1131 * enumeration succeeds or %-EBUSY if enumeration fails.
1133 int __devinit
rio_enum_mport(struct rio_mport
*mport
)
1135 struct rio_net
*net
= NULL
;
1138 printk(KERN_INFO
"RIO: enumerate master port %d, %s\n", mport
->id
,
1140 /* If somebody else enumerated our master port device, bail. */
1141 if (rio_enum_host(mport
) < 0) {
1143 "RIO: master port %d device has been enumerated by a remote host\n",
1149 /* If master port has an active link, allocate net and enum peers */
1150 if (rio_mport_is_active(mport
)) {
1151 if (!(net
= rio_alloc_net(mport
))) {
1152 printk(KERN_ERR
"RIO: failed to allocate new net\n");
1157 /* Enable Input Output Port (transmitter reviever) */
1158 rio_enable_rx_tx_port(mport
, 1, 0, 0, 0);
1160 if (rio_enum_peer(net
, mport
, 0, NULL
, 0) < 0) {
1161 /* A higher priority host won enumeration, bail. */
1163 "RIO: master port %d device has lost enumeration to a remote host\n",
1165 rio_clear_locks(mport
);
1169 rio_update_route_tables(mport
);
1170 rio_clear_locks(mport
);
1171 rio_pw_enable(mport
, 1);
1173 printk(KERN_INFO
"RIO: master port %d link inactive\n",
1183 * rio_build_route_tables- Generate route tables from switch route entries
1185 * For each switch device, generate a route table by copying existing
1186 * route entries from the switch.
1188 static void rio_build_route_tables(void)
1190 struct rio_dev
*rdev
;
1194 list_for_each_entry(rdev
, &rio_devices
, global_list
)
1195 if (rio_is_switch(rdev
)) {
1196 rio_lock_device(rdev
->net
->hport
, rdev
->rswitch
->destid
,
1197 rdev
->rswitch
->hopcount
, 1000);
1199 i
< RIO_MAX_ROUTE_ENTRIES(rdev
->net
->hport
->sys_size
);
1201 if (rio_route_get_entry
1202 (rdev
->net
->hport
, rdev
->rswitch
,
1203 RIO_GLOBAL_TABLE
, i
, &sport
, 0) < 0)
1205 rdev
->rswitch
->route_table
[i
] = sport
;
1208 rio_unlock_device(rdev
->net
->hport
,
1209 rdev
->rswitch
->destid
,
1210 rdev
->rswitch
->hopcount
);
1215 * rio_enum_timeout- Signal that enumeration timed out
1216 * @data: Address of timeout flag.
1218 * When the enumeration complete timer expires, set a flag that
1219 * signals to the discovery process that enumeration did not
1220 * complete in a sane amount of time.
1222 static void rio_enum_timeout(unsigned long data
)
1224 /* Enumeration timed out, set flag */
1229 * rio_disc_mport- Start discovery through a master port
1230 * @mport: Master port to send transactions
1232 * Starts the discovery process. If we have an active link,
1233 * then wait for the signal that enumeration is complete.
1234 * When enumeration completion is signaled, start recursive
1235 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1238 int __devinit
rio_disc_mport(struct rio_mport
*mport
)
1240 struct rio_net
*net
= NULL
;
1241 int enum_timeout_flag
= 0;
1243 printk(KERN_INFO
"RIO: discover master port %d, %s\n", mport
->id
,
1246 /* If master port has an active link, allocate net and discover peers */
1247 if (rio_mport_is_active(mport
)) {
1248 if (!(net
= rio_alloc_net(mport
))) {
1249 printk(KERN_ERR
"RIO: Failed to allocate new net\n");
1253 pr_debug("RIO: wait for enumeration complete...");
1255 rio_enum_timer
.expires
=
1256 jiffies
+ CONFIG_RAPIDIO_DISC_TIMEOUT
* HZ
;
1257 rio_enum_timer
.data
= (unsigned long)&enum_timeout_flag
;
1258 add_timer(&rio_enum_timer
);
1259 while (!rio_enum_complete(mport
)) {
1261 if (enum_timeout_flag
) {
1262 del_timer_sync(&rio_enum_timer
);
1266 del_timer_sync(&rio_enum_timer
);
1270 /* Read DestID assigned by enumerator */
1271 rio_local_read_config_32(mport
, RIO_DID_CSR
,
1272 &mport
->host_deviceid
);
1273 mport
->host_deviceid
= RIO_GET_DID(mport
->sys_size
,
1274 mport
->host_deviceid
);
1276 if (rio_disc_peer(net
, mport
, RIO_ANY_DESTID(mport
->sys_size
),
1279 "RIO: master port %d device has failed discovery\n",
1284 rio_build_route_tables();
1290 pr_debug("timeout\n");