2 * RapidIO enumeration and discovery support
4 * Copyright 2005 MontaVista Software, Inc.
5 * Matt Porter <mporter@kernel.crashing.org>
7 * Copyright 2009 Integrated Device Technology, Inc.
8 * Alex Bounine <alexandre.bounine@idt.com>
9 * - Added Port-Write/Error Management initialization and handling
11 * Copyright 2009 Sysgo AG
12 * Thomas Moll <thomas.moll@sysgo.com>
13 * - Added Input- Output- enable functionality, to allow full communication
15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms of the GNU General Public License as published by the
17 * Free Software Foundation; either version 2 of the License, or (at your
18 * option) any later version.
21 #include <linux/types.h>
22 #include <linux/kernel.h>
24 #include <linux/delay.h>
25 #include <linux/dma-mapping.h>
26 #include <linux/init.h>
27 #include <linux/rio.h>
28 #include <linux/rio_drv.h>
29 #include <linux/rio_ids.h>
30 #include <linux/rio_regs.h>
31 #include <linux/module.h>
32 #include <linux/spinlock.h>
33 #include <linux/timer.h>
34 #include <linux/sched.h>
35 #include <linux/jiffies.h>
36 #include <linux/slab.h>
40 LIST_HEAD(rio_devices);
42 static void rio_init_em(struct rio_dev *rdev);
44 DEFINE_SPINLOCK(rio_global_list_lock);
46 static int next_destid = 0;
47 static int next_comptag = 1;
49 static int rio_mport_phys_table[] = {
51 RIO_EFB_PAR_EP_REC_ID,
53 RIO_EFB_SER_EP_REC_ID,
58 * rio_get_device_id - Get the base/extended device id for a device
59 * @port: RIO master port
60 * @destid: Destination ID of device
61 * @hopcount: Hopcount to device
63 * Reads the base/extended device id from a device. Returns the
66 static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
70 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
72 return RIO_GET_DID(port->sys_size, result);
76 * rio_set_device_id - Set the base/extended device id for a device
77 * @port: RIO master port
78 * @destid: Destination ID of device
79 * @hopcount: Hopcount to device
80 * @did: Device ID value to be written
82 * Writes the base/extended device id from a device.
84 static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
86 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
87 RIO_SET_DID(port->sys_size, did));
91 * rio_local_set_device_id - Set the base/extended device id for a port
92 * @port: RIO master port
93 * @did: Device ID value to be written
95 * Writes the base/extended device id from a device.
97 static void rio_local_set_device_id(struct rio_mport *port, u16 did)
99 rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
104 * rio_clear_locks- Release all host locks and signal enumeration complete
105 * @net: RIO network to run on
107 * Marks the component tag CSR on each device with the enumeration
108 * complete flag. When complete, it then release the host locks on
109 * each device. Returns 0 on success or %-EINVAL on failure.
111 static int rio_clear_locks(struct rio_net *net)
113 struct rio_mport *port = net->hport;
114 struct rio_dev *rdev;
118 /* Release host device id locks */
119 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
120 port->host_deviceid);
121 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
122 if ((result & 0xffff) != 0xffff) {
124 "RIO: badness when releasing host lock on master port, result %8.8x\n",
128 list_for_each_entry(rdev, &net->devices, net_list) {
129 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
130 port->host_deviceid);
131 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
132 if ((result & 0xffff) != 0xffff) {
134 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
135 rdev->vid, rdev->did);
139 /* Mark device as discovered and enable master */
140 rio_read_config_32(rdev,
141 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
143 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
144 rio_write_config_32(rdev,
145 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
153 * rio_enum_host- Set host lock and initialize host destination ID
154 * @port: Master port to issue transaction
156 * Sets the local host master port lock and destination ID register
157 * with the host device ID value. The host device ID value is provided
158 * by the platform. Returns %0 on success or %-1 on failure.
160 static int rio_enum_host(struct rio_mport *port)
164 /* Set master port host device id lock */
165 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
166 port->host_deviceid);
168 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
169 if ((result & 0xffff) != port->host_deviceid)
172 /* Set master port destid and init destid ctr */
173 rio_local_set_device_id(port, port->host_deviceid);
175 if (next_destid == port->host_deviceid)
182 * rio_device_has_destid- Test if a device contains a destination ID register
183 * @port: Master port to issue transaction
184 * @src_ops: RIO device source operations
185 * @dst_ops: RIO device destination operations
187 * Checks the provided @src_ops and @dst_ops for the necessary transaction
188 * capabilities that indicate whether or not a device will implement a
189 * destination ID register. Returns 1 if true or 0 if false.
191 static int rio_device_has_destid(struct rio_mport *port, int src_ops,
194 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;
196 return !!((src_ops | dst_ops) & mask);
200 * rio_release_dev- Frees a RIO device struct
201 * @dev: LDM device associated with a RIO device struct
203 * Gets the RIO device struct associated a RIO device struct.
204 * The RIO device struct is freed.
206 static void rio_release_dev(struct device *dev)
208 struct rio_dev *rdev;
210 rdev = to_rio_dev(dev);
215 * rio_is_switch- Tests if a RIO device has switch capabilities
218 * Gets the RIO device Processing Element Features register
219 * contents and tests for switch capabilities. Returns 1 if
220 * the device is a switch or 0 if it is not a switch.
221 * The RIO device struct is freed.
223 static int rio_is_switch(struct rio_dev *rdev)
225 if (rdev->pef & RIO_PEF_SWITCH)
231 * rio_switch_init - Sets switch operations for a particular vendor switch
233 * @do_enum: Enumeration/Discovery mode flag
235 * Searches the RIO switch ops table for known switch types. If the vid
236 * and did match a switch table entry, then call switch initialization
237 * routine to setup switch-specific routines.
239 static void rio_switch_init(struct rio_dev *rdev, int do_enum)
241 struct rio_switch_ops *cur = __start_rio_switch_ops;
242 struct rio_switch_ops *end = __end_rio_switch_ops;
245 if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
246 pr_debug("RIO: calling init routine for %s\n",
248 cur->init_hook(rdev, do_enum);
254 if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) {
255 pr_debug("RIO: adding STD routing ops for %s\n",
257 rdev->rswitch->add_entry = rio_std_route_add_entry;
258 rdev->rswitch->get_entry = rio_std_route_get_entry;
259 rdev->rswitch->clr_table = rio_std_route_clr_table;
262 if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
263 printk(KERN_ERR "RIO: missing routing ops for %s\n",
268 * rio_add_device- Adds a RIO device to the device model
271 * Adds the RIO device to the global device list and adds the RIO
272 * device to the RIO device list. Creates the generic sysfs nodes
275 static int __devinit rio_add_device(struct rio_dev *rdev)
279 err = device_add(&rdev->dev);
283 spin_lock(&rio_global_list_lock);
284 list_add_tail(&rdev->global_list, &rio_devices);
285 spin_unlock(&rio_global_list_lock);
287 rio_create_sysfs_dev_files(rdev);
293 * rio_enable_rx_tx_port - enable input receiver and output transmitter of
295 * @port: Master port associated with the RIO network
296 * @local: local=1 select local port otherwise a far device is reached
297 * @destid: Destination ID of the device to check host bit
298 * @hopcount: Number of hops to reach the target
299 * @port_num: Port (-number on switch) to enable on a far end device
301 * Returns 0 or 1 from on General Control Command and Status Register
304 inline int rio_enable_rx_tx_port(struct rio_mport *port,
305 int local, u16 destid,
306 u8 hopcount, u8 port_num) {
307 #ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
312 * enable rx input tx output port
314 pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
315 "%d, port_num = %d)\n", local, destid, hopcount, port_num);
317 ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
320 rio_local_read_config_32(port, ext_ftr_ptr +
321 RIO_PORT_N_CTL_CSR(0),
324 if (rio_mport_read_config_32(port, destid, hopcount,
325 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), ®val) < 0)
329 if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
331 regval = regval | RIO_PORT_N_CTL_EN_RX_SER
332 | RIO_PORT_N_CTL_EN_TX_SER;
335 regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
336 | RIO_PORT_N_CTL_EN_TX_PAR;
340 rio_local_write_config_32(port, ext_ftr_ptr +
341 RIO_PORT_N_CTL_CSR(0), regval);
343 if (rio_mport_write_config_32(port, destid, hopcount,
344 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
352 * rio_setup_device- Allocates and sets up a RIO device
354 * @port: Master port to send transactions
355 * @destid: Current destination ID
356 * @hopcount: Current hopcount
357 * @do_enum: Enumeration/Discovery mode flag
359 * Allocates a RIO device and configures fields based on configuration
360 * space contents. If device has a destination ID register, a destination
361 * ID is either assigned in enumeration mode or read from configuration
362 * space in discovery mode. If the device has switch capabilities, then
363 * a switch is allocated and configured appropriately. Returns a pointer
364 * to a RIO device on success or NULL on failure.
367 static struct rio_dev __devinit *rio_setup_device(struct rio_net *net,
368 struct rio_mport *port, u16 destid,
369 u8 hopcount, int do_enum)
372 struct rio_dev *rdev;
373 struct rio_switch *rswitch = NULL;
378 size = sizeof(struct rio_dev);
379 if (rio_mport_read_config_32(port, destid, hopcount,
380 RIO_PEF_CAR, &result))
383 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
384 rio_mport_read_config_32(port, destid, hopcount,
385 RIO_SWP_INFO_CAR, &swpinfo);
386 if (result & RIO_PEF_SWITCH) {
387 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
388 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
392 rdev = kzalloc(size, GFP_KERNEL);
398 rdev->swpinfo = swpinfo;
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 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
413 rdev->efptr = result & 0xffff;
414 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
417 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
418 hopcount, RIO_EFB_ERR_MGMNT);
421 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
423 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
427 /* Assign component tag to device */
428 if (next_comptag >= 0x10000) {
429 pr_err("RIO: Component Tag Counter Overflow\n");
432 rio_mport_write_config_32(port, destid, hopcount,
433 RIO_COMPONENT_TAG_CSR, next_comptag);
434 rdev->comp_tag = next_comptag++;
436 rio_mport_read_config_32(port, destid, hopcount,
437 RIO_COMPONENT_TAG_CSR,
441 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
443 rio_set_device_id(port, destid, hopcount, next_destid);
444 rdev->destid = next_destid++;
445 if (next_destid == port->host_deviceid)
448 rdev->destid = rio_get_device_id(port, destid, hopcount);
450 rdev->hopcount = 0xff;
452 /* Switch device has an associated destID which
453 * will be adjusted later
455 rdev->destid = destid;
456 rdev->hopcount = hopcount;
459 /* If a PE has both switch and other functions, show it as a switch */
460 if (rio_is_switch(rdev)) {
461 rswitch = rdev->rswitch;
462 rswitch->switchid = rdev->comp_tag & RIO_CTAG_UDEVID;
463 rswitch->port_ok = 0;
464 rswitch->route_table = kzalloc(sizeof(u8)*
465 RIO_MAX_ROUTE_ENTRIES(port->sys_size),
467 if (!rswitch->route_table)
469 /* Initialize switch route table */
470 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
472 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
473 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
475 rio_switch_init(rdev, do_enum);
477 if (do_enum && rswitch->clr_table)
478 rswitch->clr_table(port, destid, hopcount,
481 list_add_tail(&rswitch->node, &net->switches);
485 /*Enable Input Output Port (transmitter reviever)*/
486 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
488 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
492 rdev->dev.bus = &rio_bus_type;
493 rdev->dev.parent = &rio_bus;
495 device_initialize(&rdev->dev);
496 rdev->dev.release = rio_release_dev;
499 rdev->dma_mask = DMA_BIT_MASK(32);
500 rdev->dev.dma_mask = &rdev->dma_mask;
501 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
503 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
504 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
507 ret = rio_add_device(rdev);
515 kfree(rswitch->route_table);
522 * rio_sport_is_active- Tests if a switch port has an active connection.
523 * @port: Master port to send transaction
524 * @destid: Associated destination ID for switch
525 * @hopcount: Hopcount to reach switch
526 * @sport: Switch port number
528 * Reads the port error status CSR for a particular switch port to
529 * determine if the port has an active link. Returns
530 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
534 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
539 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
541 while (ext_ftr_ptr) {
542 rio_mport_read_config_32(port, destid, hopcount,
543 ext_ftr_ptr, &result);
544 result = RIO_GET_BLOCK_ID(result);
545 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
546 (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
547 (result == RIO_EFB_SER_EP_FREC_ID))
550 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
555 rio_mport_read_config_32(port, destid, hopcount,
557 RIO_PORT_N_ERR_STS_CSR(sport),
560 return result & RIO_PORT_N_ERR_STS_PORT_OK;
564 * rio_lock_device - Acquires host device lock for specified device
565 * @port: Master port to send transaction
566 * @destid: Destination ID for device/switch
567 * @hopcount: Hopcount to reach switch
568 * @wait_ms: Max wait time in msec (0 = no timeout)
570 * Attepts to acquire host device lock for specified device
571 * Returns 0 if device lock acquired or EINVAL if timeout expires.
574 rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
579 /* Attempt to acquire device lock */
580 rio_mport_write_config_32(port, destid, hopcount,
581 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
582 rio_mport_read_config_32(port, destid, hopcount,
583 RIO_HOST_DID_LOCK_CSR, &result);
585 while (result != port->host_deviceid) {
586 if (wait_ms != 0 && tcnt == wait_ms) {
587 pr_debug("RIO: timeout when locking device %x:%x\n",
595 /* Try to acquire device lock again */
596 rio_mport_write_config_32(port, destid,
598 RIO_HOST_DID_LOCK_CSR,
599 port->host_deviceid);
600 rio_mport_read_config_32(port, destid,
602 RIO_HOST_DID_LOCK_CSR, &result);
609 * rio_unlock_device - Releases host device lock for specified device
610 * @port: Master port to send transaction
611 * @destid: Destination ID for device/switch
612 * @hopcount: Hopcount to reach switch
614 * Returns 0 if device lock released or EINVAL if fails.
617 rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
621 /* Release device lock */
622 rio_mport_write_config_32(port, destid,
624 RIO_HOST_DID_LOCK_CSR,
625 port->host_deviceid);
626 rio_mport_read_config_32(port, destid, hopcount,
627 RIO_HOST_DID_LOCK_CSR, &result);
628 if ((result & 0xffff) != 0xffff) {
629 pr_debug("RIO: badness when releasing device lock %x:%x\n",
638 * rio_route_add_entry- Add a route entry to a switch routing table
640 * @table: Routing table ID
641 * @route_destid: Destination ID to be routed
642 * @route_port: Port number to be routed
643 * @lock: lock switch device flag
645 * Calls the switch specific add_entry() method to add a route entry
646 * on a switch. The route table can be specified using the @table
647 * argument if a switch has per port routing tables or the normal
648 * use is to specific all tables (or the global table) by passing
649 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
653 rio_route_add_entry(struct rio_dev *rdev,
654 u16 table, u16 route_destid, u8 route_port, int lock)
659 rc = rio_lock_device(rdev->net->hport, rdev->destid,
660 rdev->hopcount, 1000);
665 rc = rdev->rswitch->add_entry(rdev->net->hport, rdev->destid,
666 rdev->hopcount, table,
667 route_destid, route_port);
669 rio_unlock_device(rdev->net->hport, rdev->destid,
676 * rio_route_get_entry- Read a route entry in a switch routing table
678 * @table: Routing table ID
679 * @route_destid: Destination ID to be routed
680 * @route_port: Pointer to read port number into
681 * @lock: lock switch device flag
683 * Calls the switch specific get_entry() method to read a route entry
684 * in a switch. The route table can be specified using the @table
685 * argument if a switch has per port routing tables or the normal
686 * use is to specific all tables (or the global table) by passing
687 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
691 rio_route_get_entry(struct rio_dev *rdev, u16 table,
692 u16 route_destid, u8 *route_port, int lock)
697 rc = rio_lock_device(rdev->net->hport, rdev->destid,
698 rdev->hopcount, 1000);
703 rc = rdev->rswitch->get_entry(rdev->net->hport, rdev->destid,
704 rdev->hopcount, table,
705 route_destid, route_port);
707 rio_unlock_device(rdev->net->hport, rdev->destid,
714 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
715 * @port: Master port to send transaction
716 * @hopcount: Number of hops to the device
718 * Used during enumeration to read the Host Device ID Lock CSR on a
719 * RIO device. Returns the value of the lock register.
721 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
725 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
726 RIO_HOST_DID_LOCK_CSR, &result);
728 return (u16) (result & 0xffff);
732 * rio_enum_peer- Recursively enumerate a RIO network through a master port
733 * @net: RIO network being enumerated
734 * @port: Master port to send transactions
735 * @hopcount: Number of hops into the network
736 * @prev: Previous RIO device connected to the enumerated one
737 * @prev_port: Port on previous RIO device
739 * Recursively enumerates a RIO network. Transactions are sent via the
740 * master port passed in @port.
742 static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
743 u8 hopcount, struct rio_dev *prev, int prev_port)
749 struct rio_dev *rdev;
754 if (rio_mport_chk_dev_access(port,
755 RIO_ANY_DESTID(port->sys_size), hopcount)) {
756 pr_debug("RIO: device access check failed\n");
760 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
761 pr_debug("RIO: PE already discovered by this host\n");
763 * Already discovered by this host. Add it as another
764 * link to the existing device.
766 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
767 hopcount, RIO_COMPONENT_TAG_CSR, ®val);
770 rdev = rio_get_comptag((regval & 0xffff), NULL);
772 if (rdev && prev && rio_is_switch(prev)) {
773 pr_debug("RIO: redundant path to %s\n",
775 prev->rswitch->nextdev[prev_port] = rdev;
782 /* Attempt to acquire device lock */
783 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
785 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
786 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
787 < port->host_deviceid) {
790 /* Attempt to acquire device lock again */
791 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
793 RIO_HOST_DID_LOCK_CSR,
794 port->host_deviceid);
797 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
799 "RIO: PE locked by a higher priority host...retreating\n");
803 /* Setup new RIO device */
804 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
807 /* Add device to the global and bus/net specific list. */
808 list_add_tail(&rdev->net_list, &net->devices);
810 if (prev && rio_is_switch(prev))
811 prev->rswitch->nextdev[prev_port] = rdev;
815 if (rio_is_switch(rdev)) {
816 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
817 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
818 port->host_deviceid, sw_inport, 0);
819 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
821 for (destid = 0; destid < next_destid; destid++) {
822 if (destid == port->host_deviceid)
824 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
825 destid, sw_inport, 0);
826 rdev->rswitch->route_table[destid] = sw_inport;
830 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
831 rio_name(rdev), rdev->vid, rdev->did,
832 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
833 sw_destid = next_destid;
835 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
837 if (sw_inport == port_num) {
838 rio_enable_rx_tx_port(port, 0,
839 RIO_ANY_DESTID(port->sys_size),
841 rdev->rswitch->port_ok |= (1 << port_num);
845 cur_destid = next_destid;
847 if (rio_sport_is_active
848 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
851 "RIO: scanning device on port %d\n",
853 rio_enable_rx_tx_port(port, 0,
854 RIO_ANY_DESTID(port->sys_size),
856 rdev->rswitch->port_ok |= (1 << port_num);
857 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
858 RIO_ANY_DESTID(port->sys_size),
861 if (rio_enum_peer(net, port, hopcount + 1,
865 /* Update routing tables */
866 if (next_destid > cur_destid) {
867 for (destid = cur_destid;
868 destid < next_destid; destid++) {
869 if (destid == port->host_deviceid)
871 rio_route_add_entry(rdev,
877 route_table[destid] =
882 /* If switch supports Error Management,
883 * set PORT_LOCKOUT bit for unused port
886 rio_set_port_lockout(rdev, port_num, 1);
888 rdev->rswitch->port_ok &= ~(1 << port_num);
892 /* Direct Port-write messages to the enumeratiing host */
893 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
895 rio_write_config_32(rdev,
896 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
897 (port->host_deviceid << 16) |
898 (port->sys_size << 15));
903 /* Check for empty switch */
904 if (next_destid == sw_destid) {
906 if (next_destid == port->host_deviceid)
910 rdev->destid = sw_destid;
912 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
913 rio_name(rdev), rdev->vid, rdev->did);
919 * rio_enum_complete- Tests if enumeration of a network is complete
920 * @port: Master port to send transaction
922 * Tests the PGCCSR discovered bit for non-zero value (enumeration
923 * complete flag). Return %1 if enumeration is complete or %0 if
924 * enumeration is incomplete.
926 static int rio_enum_complete(struct rio_mport *port)
930 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
932 return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
936 * rio_disc_peer- Recursively discovers a RIO network through a master port
937 * @net: RIO network being discovered
938 * @port: Master port to send transactions
939 * @destid: Current destination ID in network
940 * @hopcount: Number of hops into the network
941 * @prev: previous rio_dev
942 * @prev_port: previous port number
944 * Recursively discovers a RIO network. Transactions are sent via the
945 * master port passed in @port.
948 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
949 u8 hopcount, struct rio_dev *prev, int prev_port)
951 u8 port_num, route_port;
952 struct rio_dev *rdev;
955 /* Setup new RIO device */
956 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
957 /* Add device to the global and bus/net specific list. */
958 list_add_tail(&rdev->net_list, &net->devices);
960 if (prev && rio_is_switch(prev))
961 prev->rswitch->nextdev[prev_port] = rdev;
965 if (rio_is_switch(rdev)) {
966 /* Associated destid is how we accessed this switch */
967 rdev->destid = destid;
970 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
971 rio_name(rdev), rdev->vid, rdev->did,
972 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
974 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
976 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
979 if (rio_sport_is_active
980 (port, destid, hopcount, port_num)) {
982 "RIO: scanning device on port %d\n",
985 rio_lock_device(port, destid, hopcount, 1000);
988 ndestid < RIO_ANY_DESTID(port->sys_size);
990 rio_route_get_entry(rdev,
994 if (route_port == port_num)
998 if (ndestid == RIO_ANY_DESTID(port->sys_size))
1000 rio_unlock_device(port, destid, hopcount);
1001 if (rio_disc_peer(net, port, ndestid,
1002 hopcount + 1, rdev, port_num) < 0)
1007 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
1008 rio_name(rdev), rdev->vid, rdev->did);
1014 * rio_mport_is_active- Tests if master port link is active
1015 * @port: Master port to test
1017 * Reads the port error status CSR for the master port to
1018 * determine if the port has an active link. Returns
1019 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
1020 * or %0 if it is inactive.
1022 static int rio_mport_is_active(struct rio_mport *port)
1026 int *entry = rio_mport_phys_table;
1030 rio_mport_get_feature(port, 1, 0, 0, *entry)))
1032 } while (*++entry >= 0);
1035 rio_local_read_config_32(port,
1037 RIO_PORT_N_ERR_STS_CSR(port->index),
1040 return result & RIO_PORT_N_ERR_STS_PORT_OK;
1044 * rio_alloc_net- Allocate and configure a new RIO network
1045 * @port: Master port associated with the RIO network
1047 * Allocates a RIO network structure, initializes per-network
1048 * list heads, and adds the associated master port to the
1049 * network list of associated master ports. Returns a
1050 * RIO network pointer on success or %NULL on failure.
1052 static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
1054 struct rio_net *net;
1056 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
1058 INIT_LIST_HEAD(&net->node);
1059 INIT_LIST_HEAD(&net->devices);
1060 INIT_LIST_HEAD(&net->switches);
1061 INIT_LIST_HEAD(&net->mports);
1062 list_add_tail(&port->nnode, &net->mports);
1070 * rio_update_route_tables- Updates route tables in switches
1071 * @net: RIO network to run update on
1073 * For each enumerated device, ensure that each switch in a system
1074 * has correct routing entries. Add routes for devices that where
1075 * unknown dirung the first enumeration pass through the switch.
1077 static void rio_update_route_tables(struct rio_net *net)
1079 struct rio_dev *rdev, *swrdev;
1080 struct rio_switch *rswitch;
1084 list_for_each_entry(rdev, &net->devices, net_list) {
1086 destid = rdev->destid;
1088 list_for_each_entry(rswitch, &net->switches, node) {
1090 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
1093 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
1094 swrdev = sw_to_rio_dev(rswitch);
1096 /* Skip if destid ends in empty switch*/
1097 if (swrdev->destid == destid)
1100 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
1102 if (rswitch->add_entry) {
1103 rio_route_add_entry(swrdev,
1104 RIO_GLOBAL_TABLE, destid,
1106 rswitch->route_table[destid] = sport;
1114 * rio_init_em - Initializes RIO Error Management (for switches)
1117 * For each enumerated switch, call device-specific error management
1118 * initialization routine (if supplied by the switch driver).
1120 static void rio_init_em(struct rio_dev *rdev)
1122 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
1123 (rdev->rswitch->em_init)) {
1124 rdev->rswitch->em_init(rdev);
1129 * rio_pw_enable - Enables/disables port-write handling by a master port
1130 * @port: Master port associated with port-write handling
1131 * @enable: 1=enable, 0=disable
1133 static void rio_pw_enable(struct rio_mport *port, int enable)
1135 if (port->ops->pwenable)
1136 port->ops->pwenable(port, enable);
1140 * rio_enum_mport- Start enumeration through a master port
1141 * @mport: Master port to send transactions
1143 * Starts the enumeration process. If somebody has enumerated our
1144 * master port device, then give up. If not and we have an active
1145 * link, then start recursive peer enumeration. Returns %0 if
1146 * enumeration succeeds or %-EBUSY if enumeration fails.
1148 int __devinit rio_enum_mport(struct rio_mport *mport)
1150 struct rio_net *net = NULL;
1153 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1155 /* If somebody else enumerated our master port device, bail. */
1156 if (rio_enum_host(mport) < 0) {
1158 "RIO: master port %d device has been enumerated by a remote host\n",
1164 /* If master port has an active link, allocate net and enum peers */
1165 if (rio_mport_is_active(mport)) {
1166 if (!(net = rio_alloc_net(mport))) {
1167 printk(KERN_ERR "RIO: failed to allocate new net\n");
1172 /* Enable Input Output Port (transmitter reviever) */
1173 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1175 /* Set component tag for host */
1176 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1179 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1180 /* A higher priority host won enumeration, bail. */
1182 "RIO: master port %d device has lost enumeration to a remote host\n",
1184 rio_clear_locks(net);
1188 rio_update_route_tables(net);
1189 rio_clear_locks(net);
1190 rio_pw_enable(mport, 1);
1192 printk(KERN_INFO "RIO: master port %d link inactive\n",
1202 * rio_build_route_tables- Generate route tables from switch route entries
1203 * @net: RIO network to run route tables scan on
1205 * For each switch device, generate a route table by copying existing
1206 * route entries from the switch.
1208 static void rio_build_route_tables(struct rio_net *net)
1210 struct rio_switch *rswitch;
1211 struct rio_dev *rdev;
1215 list_for_each_entry(rswitch, &net->switches, node) {
1216 rdev = sw_to_rio_dev(rswitch);
1218 rio_lock_device(net->hport, rdev->destid,
1219 rdev->hopcount, 1000);
1221 i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
1223 if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
1226 rswitch->route_table[i] = sport;
1229 rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
1234 * rio_disc_mport- Start discovery through a master port
1235 * @mport: Master port to send transactions
1237 * Starts the discovery process. If we have an active link,
1238 * then wait for the signal that enumeration is complete.
1239 * When enumeration completion is signaled, start recursive
1240 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1243 int __devinit rio_disc_mport(struct rio_mport *mport)
1245 struct rio_net *net = NULL;
1246 unsigned long to_end;
1248 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1251 /* If master port has an active link, allocate net and discover peers */
1252 if (rio_mport_is_active(mport)) {
1253 pr_debug("RIO: wait for enumeration to complete...\n");
1255 to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1256 while (time_before(jiffies, to_end)) {
1257 if (rio_enum_complete(mport))
1259 schedule_timeout_uninterruptible(msecs_to_jiffies(10));
1262 pr_debug("RIO: discovery timeout on mport %d %s\n",
1263 mport->id, mport->name);
1266 pr_debug("RIO: ... enumeration done\n");
1268 net = rio_alloc_net(mport);
1270 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1274 /* Read DestID assigned by enumerator */
1275 rio_local_read_config_32(mport, RIO_DID_CSR,
1276 &mport->host_deviceid);
1277 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1278 mport->host_deviceid);
1280 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1283 "RIO: master port %d device has failed discovery\n",
1288 rio_build_route_tables(net);