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;
384 size = sizeof(struct rio_dev);
385 if (rio_mport_read_config_32(port, destid, hopcount,
386 RIO_PEF_CAR, &result))
389 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
390 rio_mport_read_config_32(port, destid, hopcount,
391 RIO_SWP_INFO_CAR, &swpinfo);
392 if (result & RIO_PEF_SWITCH) {
393 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
394 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
398 rdev = kzalloc(size, GFP_KERNEL);
404 rdev->swpinfo = swpinfo;
405 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
407 rdev->did = result >> 16;
408 rdev->vid = result & 0xffff;
409 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
411 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
413 rdev->asm_did = result >> 16;
414 rdev->asm_vid = result & 0xffff;
415 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
417 rdev->asm_rev = result >> 16;
418 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
419 rdev->efptr = result & 0xffff;
420 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
423 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
424 hopcount, RIO_EFB_ERR_MGMNT);
427 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
429 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
433 /* Assign component tag to device */
434 if (next_comptag >= 0x10000) {
435 pr_err("RIO: Component Tag Counter Overflow\n");
438 rio_mport_write_config_32(port, destid, hopcount,
439 RIO_COMPONENT_TAG_CSR, next_comptag);
440 rdev->comp_tag = next_comptag++;
443 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
445 rio_set_device_id(port, destid, hopcount, next_destid);
446 rdev->destid = next_destid++;
447 if (next_destid == port->host_deviceid)
450 rdev->destid = rio_get_device_id(port, destid, hopcount);
452 rdev->hopcount = 0xff;
454 /* Switch device has an associated destID which
455 * will be adjusted later
457 rdev->destid = destid;
458 rdev->hopcount = hopcount;
461 /* If a PE has both switch and other functions, show it as a switch */
462 if (rio_is_switch(rdev)) {
463 rswitch = rdev->rswitch;
464 rswitch->switchid = next_switchid;
465 rswitch->port_ok = 0;
466 rswitch->route_table = kzalloc(sizeof(u8)*
467 RIO_MAX_ROUTE_ENTRIES(port->sys_size),
469 if (!rswitch->route_table)
471 /* Initialize switch route table */
472 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
474 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
475 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
477 rio_switch_init(rdev, do_enum);
479 if (do_enum && rswitch->clr_table)
480 rswitch->clr_table(port, destid, hopcount,
483 list_add_tail(&rswitch->node, &rio_switches);
487 /*Enable Input Output Port (transmitter reviever)*/
488 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
490 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
494 rdev->dev.bus = &rio_bus_type;
495 rdev->dev.parent = &rio_bus;
497 device_initialize(&rdev->dev);
498 rdev->dev.release = rio_release_dev;
501 rdev->dma_mask = DMA_BIT_MASK(32);
502 rdev->dev.dma_mask = &rdev->dma_mask;
503 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
505 if ((rdev->pef & RIO_PEF_INB_DOORBELL) &&
506 (rdev->dst_ops & RIO_DST_OPS_DOORBELL))
507 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
510 ret = rio_add_device(rdev);
517 if (rswitch->route_table)
518 kfree(rswitch->route_table);
525 * rio_sport_is_active- Tests if a switch port has an active connection.
526 * @port: Master port to send transaction
527 * @destid: Associated destination ID for switch
528 * @hopcount: Hopcount to reach switch
529 * @sport: Switch port number
531 * Reads the port error status CSR for a particular switch port to
532 * determine if the port has an active link. Returns
533 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
537 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
542 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
544 while (ext_ftr_ptr) {
545 rio_mport_read_config_32(port, destid, hopcount,
546 ext_ftr_ptr, &result);
547 result = RIO_GET_BLOCK_ID(result);
548 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
549 (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
550 (result == RIO_EFB_SER_EP_FREC_ID))
553 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
558 rio_mport_read_config_32(port, destid, hopcount,
560 RIO_PORT_N_ERR_STS_CSR(sport),
563 return result & RIO_PORT_N_ERR_STS_PORT_OK;
567 * rio_lock_device - Acquires host device lock for specified device
568 * @port: Master port to send transaction
569 * @destid: Destination ID for device/switch
570 * @hopcount: Hopcount to reach switch
571 * @wait_ms: Max wait time in msec (0 = no timeout)
573 * Attepts to acquire host device lock for specified device
574 * Returns 0 if device lock acquired or EINVAL if timeout expires.
577 rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
582 /* Attempt to acquire device lock */
583 rio_mport_write_config_32(port, destid, hopcount,
584 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
585 rio_mport_read_config_32(port, destid, hopcount,
586 RIO_HOST_DID_LOCK_CSR, &result);
588 while (result != port->host_deviceid) {
589 if (wait_ms != 0 && tcnt == wait_ms) {
590 pr_debug("RIO: timeout when locking device %x:%x\n",
598 /* Try to acquire device lock again */
599 rio_mport_write_config_32(port, destid,
601 RIO_HOST_DID_LOCK_CSR,
602 port->host_deviceid);
603 rio_mport_read_config_32(port, destid,
605 RIO_HOST_DID_LOCK_CSR, &result);
612 * rio_unlock_device - Releases host device lock for specified device
613 * @port: Master port to send transaction
614 * @destid: Destination ID for device/switch
615 * @hopcount: Hopcount to reach switch
617 * Returns 0 if device lock released or EINVAL if fails.
620 rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
624 /* Release device lock */
625 rio_mport_write_config_32(port, destid,
627 RIO_HOST_DID_LOCK_CSR,
628 port->host_deviceid);
629 rio_mport_read_config_32(port, destid, hopcount,
630 RIO_HOST_DID_LOCK_CSR, &result);
631 if ((result & 0xffff) != 0xffff) {
632 pr_debug("RIO: badness when releasing device lock %x:%x\n",
641 * rio_route_add_entry- Add a route entry to a switch routing table
643 * @table: Routing table ID
644 * @route_destid: Destination ID to be routed
645 * @route_port: Port number to be routed
646 * @lock: lock switch device flag
648 * Calls the switch specific add_entry() method to add a route entry
649 * on a switch. The route table can be specified using the @table
650 * argument if a switch has per port routing tables or the normal
651 * use is to specific all tables (or the global table) by passing
652 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
656 rio_route_add_entry(struct rio_dev *rdev,
657 u16 table, u16 route_destid, u8 route_port, int lock)
662 rc = rio_lock_device(rdev->net->hport, rdev->destid,
663 rdev->hopcount, 1000);
668 rc = rdev->rswitch->add_entry(rdev->net->hport, rdev->destid,
669 rdev->hopcount, table,
670 route_destid, route_port);
672 rio_unlock_device(rdev->net->hport, rdev->destid,
679 * rio_route_get_entry- Read a route entry in a switch routing table
681 * @table: Routing table ID
682 * @route_destid: Destination ID to be routed
683 * @route_port: Pointer to read port number into
684 * @lock: lock switch device flag
686 * Calls the switch specific get_entry() method to read a route entry
687 * in a switch. The route table can be specified using the @table
688 * argument if a switch has per port routing tables or the normal
689 * use is to specific all tables (or the global table) by passing
690 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
694 rio_route_get_entry(struct rio_dev *rdev, u16 table,
695 u16 route_destid, u8 *route_port, int lock)
700 rc = rio_lock_device(rdev->net->hport, rdev->destid,
701 rdev->hopcount, 1000);
706 rc = rdev->rswitch->get_entry(rdev->net->hport, rdev->destid,
707 rdev->hopcount, table,
708 route_destid, route_port);
710 rio_unlock_device(rdev->net->hport, rdev->destid,
717 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
718 * @port: Master port to send transaction
719 * @hopcount: Number of hops to the device
721 * Used during enumeration to read the Host Device ID Lock CSR on a
722 * RIO device. Returns the value of the lock register.
724 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
728 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
729 RIO_HOST_DID_LOCK_CSR, &result);
731 return (u16) (result & 0xffff);
735 * rio_enum_peer- Recursively enumerate a RIO network through a master port
736 * @net: RIO network being enumerated
737 * @port: Master port to send transactions
738 * @hopcount: Number of hops into the network
739 * @prev: Previous RIO device connected to the enumerated one
740 * @prev_port: Port on previous RIO device
742 * Recursively enumerates a RIO network. Transactions are sent via the
743 * master port passed in @port.
745 static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
746 u8 hopcount, struct rio_dev *prev, int prev_port)
752 struct rio_dev *rdev;
757 if (rio_mport_chk_dev_access(port,
758 RIO_ANY_DESTID(port->sys_size), hopcount)) {
759 pr_debug("RIO: device access check failed\n");
763 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
764 pr_debug("RIO: PE already discovered by this host\n");
766 * Already discovered by this host. Add it as another
767 * link to the existing device.
769 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
770 hopcount, RIO_COMPONENT_TAG_CSR, ®val);
773 rdev = rio_get_comptag((regval & 0xffff), NULL);
775 if (rdev && prev && rio_is_switch(prev)) {
776 pr_debug("RIO: redundant path to %s\n",
778 prev->rswitch->nextdev[prev_port] = rdev;
785 /* Attempt to acquire device lock */
786 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
788 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
789 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
790 < port->host_deviceid) {
793 /* Attempt to acquire device lock again */
794 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
796 RIO_HOST_DID_LOCK_CSR,
797 port->host_deviceid);
800 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
802 "RIO: PE locked by a higher priority host...retreating\n");
806 /* Setup new RIO device */
807 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
810 /* Add device to the global and bus/net specific list. */
811 list_add_tail(&rdev->net_list, &net->devices);
813 if (prev && rio_is_switch(prev))
814 prev->rswitch->nextdev[prev_port] = rdev;
818 if (rio_is_switch(rdev)) {
820 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
821 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
822 port->host_deviceid, sw_inport, 0);
823 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
825 for (destid = 0; destid < next_destid; destid++) {
826 if (destid == port->host_deviceid)
828 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
829 destid, sw_inport, 0);
830 rdev->rswitch->route_table[destid] = sw_inport;
834 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
835 rio_name(rdev), rdev->vid, rdev->did,
836 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
837 sw_destid = next_destid;
839 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
841 /*Enable Input Output Port (transmitter reviever)*/
842 rio_enable_rx_tx_port(port, 0,
843 RIO_ANY_DESTID(port->sys_size),
846 if (sw_inport == port_num) {
847 rdev->rswitch->port_ok |= (1 << port_num);
851 cur_destid = next_destid;
853 if (rio_sport_is_active
854 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
857 "RIO: scanning device on port %d\n",
859 rdev->rswitch->port_ok |= (1 << port_num);
860 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
861 RIO_ANY_DESTID(port->sys_size),
864 if (rio_enum_peer(net, port, hopcount + 1,
868 /* Update routing tables */
869 if (next_destid > cur_destid) {
870 for (destid = cur_destid;
871 destid < next_destid; destid++) {
872 if (destid == port->host_deviceid)
874 rio_route_add_entry(rdev,
880 route_table[destid] =
885 /* If switch supports Error Management,
886 * set PORT_LOCKOUT bit for unused port
889 rio_set_port_lockout(rdev, port_num, 1);
891 rdev->rswitch->port_ok &= ~(1 << port_num);
895 /* Direct Port-write messages to the enumeratiing host */
896 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
898 rio_write_config_32(rdev,
899 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
900 (port->host_deviceid << 16) |
901 (port->sys_size << 15));
906 /* Check for empty switch */
907 if (next_destid == sw_destid) {
909 if (next_destid == port->host_deviceid)
913 rdev->destid = sw_destid;
915 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
916 rio_name(rdev), rdev->vid, rdev->did);
922 * rio_enum_complete- Tests if enumeration of a network is complete
923 * @port: Master port to send transaction
925 * Tests the Component Tag CSR for non-zero value (enumeration
926 * complete flag). Return %1 if enumeration is complete or %0 if
927 * enumeration is incomplete.
929 static int rio_enum_complete(struct rio_mport *port)
933 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
935 return (regval & RIO_PORT_GEN_MASTER) ? 1 : 0;
939 * rio_disc_peer- Recursively discovers a RIO network through a master port
940 * @net: RIO network being discovered
941 * @port: Master port to send transactions
942 * @destid: Current destination ID in network
943 * @hopcount: Number of hops into the network
945 * Recursively discovers a RIO network. Transactions are sent via the
946 * master port passed in @port.
949 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
950 u8 hopcount, struct rio_dev *prev, int prev_port)
952 u8 port_num, route_port;
953 struct rio_dev *rdev;
956 /* Setup new RIO device */
957 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
958 /* Add device to the global and bus/net specific list. */
959 list_add_tail(&rdev->net_list, &net->devices);
961 if (prev && rio_is_switch(prev))
962 prev->rswitch->nextdev[prev_port] = rdev;
966 if (rio_is_switch(rdev)) {
969 /* Associated destid is how we accessed this switch */
970 rdev->destid = destid;
973 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
974 rio_name(rdev), rdev->vid, rdev->did,
975 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
977 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
979 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
982 if (rio_sport_is_active
983 (port, destid, hopcount, port_num)) {
985 "RIO: scanning device on port %d\n",
988 rio_lock_device(port, destid, hopcount, 1000);
991 ndestid < RIO_ANY_DESTID(port->sys_size);
993 rio_route_get_entry(rdev,
997 if (route_port == port_num)
1001 if (ndestid == RIO_ANY_DESTID(port->sys_size))
1003 rio_unlock_device(port, destid, hopcount);
1004 if (rio_disc_peer(net, port, ndestid,
1005 hopcount + 1, rdev, port_num) < 0)
1010 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
1011 rio_name(rdev), rdev->vid, rdev->did);
1017 * rio_mport_is_active- Tests if master port link is active
1018 * @port: Master port to test
1020 * Reads the port error status CSR for the master port to
1021 * determine if the port has an active link. Returns
1022 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
1023 * or %0 if it is inactive.
1025 static int rio_mport_is_active(struct rio_mport *port)
1029 int *entry = rio_mport_phys_table;
1033 rio_mport_get_feature(port, 1, 0, 0, *entry)))
1035 } while (*++entry >= 0);
1038 rio_local_read_config_32(port,
1040 RIO_PORT_N_ERR_STS_CSR(port->index),
1043 return result & RIO_PORT_N_ERR_STS_PORT_OK;
1047 * rio_alloc_net- Allocate and configure a new RIO network
1048 * @port: Master port associated with the RIO network
1050 * Allocates a RIO network structure, initializes per-network
1051 * list heads, and adds the associated master port to the
1052 * network list of associated master ports. Returns a
1053 * RIO network pointer on success or %NULL on failure.
1055 static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
1057 struct rio_net *net;
1059 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
1061 INIT_LIST_HEAD(&net->node);
1062 INIT_LIST_HEAD(&net->devices);
1063 INIT_LIST_HEAD(&net->mports);
1064 list_add_tail(&port->nnode, &net->mports);
1066 net->id = next_net++;
1072 * rio_update_route_tables- Updates route tables in switches
1073 * @port: Master port associated with the RIO network
1075 * For each enumerated device, ensure that each switch in a system
1076 * has correct routing entries. Add routes for devices that where
1077 * unknown dirung the first enumeration pass through the switch.
1079 static void rio_update_route_tables(struct rio_mport *port)
1081 struct rio_dev *rdev, *swrdev;
1082 struct rio_switch *rswitch;
1086 list_for_each_entry(rdev, &rio_devices, global_list) {
1088 destid = rdev->destid;
1090 list_for_each_entry(rswitch, &rio_switches, node) {
1092 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
1095 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
1096 swrdev = sw_to_rio_dev(rswitch);
1098 /* Skip if destid ends in empty switch*/
1099 if (swrdev->destid == destid)
1102 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
1104 if (rswitch->add_entry) {
1105 rio_route_add_entry(swrdev,
1106 RIO_GLOBAL_TABLE, destid,
1108 rswitch->route_table[destid] = sport;
1116 * rio_init_em - Initializes RIO Error Management (for switches)
1119 * For each enumerated switch, call device-specific error management
1120 * initialization routine (if supplied by the switch driver).
1122 static void rio_init_em(struct rio_dev *rdev)
1124 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
1125 (rdev->rswitch->em_init)) {
1126 rdev->rswitch->em_init(rdev);
1131 * rio_pw_enable - Enables/disables port-write handling by a master port
1132 * @port: Master port associated with port-write handling
1133 * @enable: 1=enable, 0=disable
1135 static void rio_pw_enable(struct rio_mport *port, int enable)
1137 if (port->ops->pwenable)
1138 port->ops->pwenable(port, enable);
1142 * rio_enum_mport- Start enumeration through a master port
1143 * @mport: Master port to send transactions
1145 * Starts the enumeration process. If somebody has enumerated our
1146 * master port device, then give up. If not and we have an active
1147 * link, then start recursive peer enumeration. Returns %0 if
1148 * enumeration succeeds or %-EBUSY if enumeration fails.
1150 int __devinit rio_enum_mport(struct rio_mport *mport)
1152 struct rio_net *net = NULL;
1155 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1157 /* If somebody else enumerated our master port device, bail. */
1158 if (rio_enum_host(mport) < 0) {
1160 "RIO: master port %d device has been enumerated by a remote host\n",
1166 /* If master port has an active link, allocate net and enum peers */
1167 if (rio_mport_is_active(mport)) {
1168 if (!(net = rio_alloc_net(mport))) {
1169 printk(KERN_ERR "RIO: failed to allocate new net\n");
1174 /* Enable Input Output Port (transmitter reviever) */
1175 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1177 /* Set component tag for host */
1178 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1181 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1182 /* A higher priority host won enumeration, bail. */
1184 "RIO: master port %d device has lost enumeration to a remote host\n",
1186 rio_clear_locks(mport);
1190 rio_update_route_tables(mport);
1191 rio_clear_locks(mport);
1192 rio_pw_enable(mport, 1);
1194 printk(KERN_INFO "RIO: master port %d link inactive\n",
1204 * rio_build_route_tables- Generate route tables from switch route entries
1206 * For each switch device, generate a route table by copying existing
1207 * route entries from the switch.
1209 static void rio_build_route_tables(void)
1211 struct rio_dev *rdev;
1215 list_for_each_entry(rdev, &rio_devices, global_list)
1216 if (rio_is_switch(rdev)) {
1217 rio_lock_device(rdev->net->hport, rdev->destid,
1218 rdev->hopcount, 1000);
1220 i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
1222 if (rio_route_get_entry(rdev,
1223 RIO_GLOBAL_TABLE, i, &sport, 0) < 0)
1225 rdev->rswitch->route_table[i] = sport;
1228 rio_unlock_device(rdev->net->hport,
1235 * rio_enum_timeout- Signal that enumeration timed out
1236 * @data: Address of timeout flag.
1238 * When the enumeration complete timer expires, set a flag that
1239 * signals to the discovery process that enumeration did not
1240 * complete in a sane amount of time.
1242 static void rio_enum_timeout(unsigned long data)
1244 /* Enumeration timed out, set flag */
1249 * rio_disc_mport- Start discovery through a master port
1250 * @mport: Master port to send transactions
1252 * Starts the discovery process. If we have an active link,
1253 * then wait for the signal that enumeration is complete.
1254 * When enumeration completion is signaled, start recursive
1255 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1258 int __devinit rio_disc_mport(struct rio_mport *mport)
1260 struct rio_net *net = NULL;
1261 int enum_timeout_flag = 0;
1263 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1266 /* If master port has an active link, allocate net and discover peers */
1267 if (rio_mport_is_active(mport)) {
1268 if (!(net = rio_alloc_net(mport))) {
1269 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1273 pr_debug("RIO: wait for enumeration complete...");
1275 rio_enum_timer.expires =
1276 jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1277 rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
1278 add_timer(&rio_enum_timer);
1279 while (!rio_enum_complete(mport)) {
1281 if (enum_timeout_flag) {
1282 del_timer_sync(&rio_enum_timer);
1286 del_timer_sync(&rio_enum_timer);
1290 /* Read DestID assigned by enumerator */
1291 rio_local_read_config_32(mport, RIO_DID_CSR,
1292 &mport->host_deviceid);
1293 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1294 mport->host_deviceid);
1296 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1299 "RIO: master port %d device has failed discovery\n",
1304 rio_build_route_tables();
1310 pr_debug("timeout\n");