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_net = 0;
48 static int next_comptag = 1;
50 static int rio_mport_phys_table[] = {
52 RIO_EFB_PAR_EP_REC_ID,
54 RIO_EFB_SER_EP_REC_ID,
59 * rio_get_device_id - Get the base/extended device id for a device
60 * @port: RIO master port
61 * @destid: Destination ID of device
62 * @hopcount: Hopcount to device
64 * Reads the base/extended device id from a device. Returns the
67 static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
71 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
73 return RIO_GET_DID(port->sys_size, result);
77 * rio_set_device_id - Set the base/extended device id for a device
78 * @port: RIO master port
79 * @destid: Destination ID of device
80 * @hopcount: Hopcount to device
81 * @did: Device ID value to be written
83 * Writes the base/extended device id from a device.
85 static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
87 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
88 RIO_SET_DID(port->sys_size, did));
92 * rio_local_set_device_id - Set the base/extended device id for a port
93 * @port: RIO master port
94 * @did: Device ID value to be written
96 * Writes the base/extended device id from a device.
98 static void rio_local_set_device_id(struct rio_mport *port, u16 did)
100 rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
105 * rio_clear_locks- Release all host locks and signal enumeration complete
106 * @net: RIO network to run on
108 * Marks the component tag CSR on each device with the enumeration
109 * complete flag. When complete, it then release the host locks on
110 * each device. Returns 0 on success or %-EINVAL on failure.
112 static int rio_clear_locks(struct rio_net *net)
114 struct rio_mport *port = net->hport;
115 struct rio_dev *rdev;
119 /* Release host device id locks */
120 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
121 port->host_deviceid);
122 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
123 if ((result & 0xffff) != 0xffff) {
125 "RIO: badness when releasing host lock on master port, result %8.8x\n",
129 list_for_each_entry(rdev, &net->devices, net_list) {
130 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
131 port->host_deviceid);
132 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
133 if ((result & 0xffff) != 0xffff) {
135 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
136 rdev->vid, rdev->did);
140 /* Mark device as discovered and enable master */
141 rio_read_config_32(rdev,
142 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
144 result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
145 rio_write_config_32(rdev,
146 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
154 * rio_enum_host- Set host lock and initialize host destination ID
155 * @port: Master port to issue transaction
157 * Sets the local host master port lock and destination ID register
158 * with the host device ID value. The host device ID value is provided
159 * by the platform. Returns %0 on success or %-1 on failure.
161 static int rio_enum_host(struct rio_mport *port)
165 /* Set master port host device id lock */
166 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
167 port->host_deviceid);
169 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
170 if ((result & 0xffff) != port->host_deviceid)
173 /* Set master port destid and init destid ctr */
174 rio_local_set_device_id(port, port->host_deviceid);
176 if (next_destid == port->host_deviceid)
183 * rio_device_has_destid- Test if a device contains a destination ID register
184 * @port: Master port to issue transaction
185 * @src_ops: RIO device source operations
186 * @dst_ops: RIO device destination operations
188 * Checks the provided @src_ops and @dst_ops for the necessary transaction
189 * capabilities that indicate whether or not a device will implement a
190 * destination ID register. Returns 1 if true or 0 if false.
192 static int rio_device_has_destid(struct rio_mport *port, int src_ops,
195 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;
197 return !!((src_ops | dst_ops) & mask);
201 * rio_release_dev- Frees a RIO device struct
202 * @dev: LDM device associated with a RIO device struct
204 * Gets the RIO device struct associated a RIO device struct.
205 * The RIO device struct is freed.
207 static void rio_release_dev(struct device *dev)
209 struct rio_dev *rdev;
211 rdev = to_rio_dev(dev);
216 * rio_is_switch- Tests if a RIO device has switch capabilities
219 * Gets the RIO device Processing Element Features register
220 * contents and tests for switch capabilities. Returns 1 if
221 * the device is a switch or 0 if it is not a switch.
222 * The RIO device struct is freed.
224 static int rio_is_switch(struct rio_dev *rdev)
226 if (rdev->pef & RIO_PEF_SWITCH)
232 * rio_switch_init - Sets switch operations for a particular vendor switch
234 * @do_enum: Enumeration/Discovery mode flag
236 * Searches the RIO switch ops table for known switch types. If the vid
237 * and did match a switch table entry, then call switch initialization
238 * routine to setup switch-specific routines.
240 static void rio_switch_init(struct rio_dev *rdev, int do_enum)
242 struct rio_switch_ops *cur = __start_rio_switch_ops;
243 struct rio_switch_ops *end = __end_rio_switch_ops;
246 if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
247 pr_debug("RIO: calling init routine for %s\n",
249 cur->init_hook(rdev, do_enum);
255 if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) {
256 pr_debug("RIO: adding STD routing ops for %s\n",
258 rdev->rswitch->add_entry = rio_std_route_add_entry;
259 rdev->rswitch->get_entry = rio_std_route_get_entry;
260 rdev->rswitch->clr_table = rio_std_route_clr_table;
263 if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
264 printk(KERN_ERR "RIO: missing routing ops for %s\n",
269 * rio_add_device- Adds a RIO device to the device model
272 * Adds the RIO device to the global device list and adds the RIO
273 * device to the RIO device list. Creates the generic sysfs nodes
276 static int __devinit rio_add_device(struct rio_dev *rdev)
280 err = device_add(&rdev->dev);
284 spin_lock(&rio_global_list_lock);
285 list_add_tail(&rdev->global_list, &rio_devices);
286 spin_unlock(&rio_global_list_lock);
288 rio_create_sysfs_dev_files(rdev);
294 * rio_enable_rx_tx_port - enable input receiver and output transmitter of
296 * @port: Master port associated with the RIO network
297 * @local: local=1 select local port otherwise a far device is reached
298 * @destid: Destination ID of the device to check host bit
299 * @hopcount: Number of hops to reach the target
300 * @port_num: Port (-number on switch) to enable on a far end device
302 * Returns 0 or 1 from on General Control Command and Status Register
305 inline int rio_enable_rx_tx_port(struct rio_mport *port,
306 int local, u16 destid,
307 u8 hopcount, u8 port_num) {
308 #ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
313 * enable rx input tx output port
315 pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
316 "%d, port_num = %d)\n", local, destid, hopcount, port_num);
318 ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
321 rio_local_read_config_32(port, ext_ftr_ptr +
322 RIO_PORT_N_CTL_CSR(0),
325 if (rio_mport_read_config_32(port, destid, hopcount,
326 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), ®val) < 0)
330 if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
332 regval = regval | RIO_PORT_N_CTL_EN_RX_SER
333 | RIO_PORT_N_CTL_EN_TX_SER;
336 regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
337 | RIO_PORT_N_CTL_EN_TX_PAR;
341 rio_local_write_config_32(port, ext_ftr_ptr +
342 RIO_PORT_N_CTL_CSR(0), regval);
344 if (rio_mport_write_config_32(port, destid, hopcount,
345 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
353 * rio_setup_device- Allocates and sets up a RIO device
355 * @port: Master port to send transactions
356 * @destid: Current destination ID
357 * @hopcount: Current hopcount
358 * @do_enum: Enumeration/Discovery mode flag
360 * Allocates a RIO device and configures fields based on configuration
361 * space contents. If device has a destination ID register, a destination
362 * ID is either assigned in enumeration mode or read from configuration
363 * space in discovery mode. If the device has switch capabilities, then
364 * a switch is allocated and configured appropriately. Returns a pointer
365 * to a RIO device on success or NULL on failure.
368 static struct rio_dev __devinit *rio_setup_device(struct rio_net *net,
369 struct rio_mport *port, u16 destid,
370 u8 hopcount, int do_enum)
373 struct rio_dev *rdev;
374 struct rio_switch *rswitch = NULL;
379 size = sizeof(struct rio_dev);
380 if (rio_mport_read_config_32(port, destid, hopcount,
381 RIO_PEF_CAR, &result))
384 if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
385 rio_mport_read_config_32(port, destid, hopcount,
386 RIO_SWP_INFO_CAR, &swpinfo);
387 if (result & RIO_PEF_SWITCH) {
388 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
389 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
393 rdev = kzalloc(size, GFP_KERNEL);
399 rdev->swpinfo = swpinfo;
400 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
402 rdev->did = result >> 16;
403 rdev->vid = result & 0xffff;
404 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
406 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
408 rdev->asm_did = result >> 16;
409 rdev->asm_vid = result & 0xffff;
410 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
412 rdev->asm_rev = result >> 16;
413 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
414 rdev->efptr = result & 0xffff;
415 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
418 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
419 hopcount, RIO_EFB_ERR_MGMNT);
422 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
424 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
428 /* Assign component tag to device */
429 if (next_comptag >= 0x10000) {
430 pr_err("RIO: Component Tag Counter Overflow\n");
433 rio_mport_write_config_32(port, destid, hopcount,
434 RIO_COMPONENT_TAG_CSR, next_comptag);
435 rdev->comp_tag = next_comptag++;
437 rio_mport_read_config_32(port, destid, hopcount,
438 RIO_COMPONENT_TAG_CSR,
442 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
444 rio_set_device_id(port, destid, hopcount, next_destid);
445 rdev->destid = next_destid++;
446 if (next_destid == port->host_deviceid)
449 rdev->destid = rio_get_device_id(port, destid, hopcount);
451 rdev->hopcount = 0xff;
453 /* Switch device has an associated destID which
454 * will be adjusted later
456 rdev->destid = destid;
457 rdev->hopcount = hopcount;
460 /* If a PE has both switch and other functions, show it as a switch */
461 if (rio_is_switch(rdev)) {
462 rswitch = rdev->rswitch;
463 rswitch->switchid = rdev->comp_tag & RIO_CTAG_UDEVID;
464 rswitch->port_ok = 0;
465 rswitch->route_table = kzalloc(sizeof(u8)*
466 RIO_MAX_ROUTE_ENTRIES(port->sys_size),
468 if (!rswitch->route_table)
470 /* Initialize switch route table */
471 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
473 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
474 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
476 rio_switch_init(rdev, do_enum);
478 if (do_enum && rswitch->clr_table)
479 rswitch->clr_table(port, destid, hopcount,
482 list_add_tail(&rswitch->node, &net->switches);
486 /*Enable Input Output Port (transmitter reviever)*/
487 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
489 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
493 rdev->dev.bus = &rio_bus_type;
494 rdev->dev.parent = &rio_bus;
496 device_initialize(&rdev->dev);
497 rdev->dev.release = rio_release_dev;
500 rdev->dma_mask = DMA_BIT_MASK(32);
501 rdev->dev.dma_mask = &rdev->dma_mask;
502 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
504 if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
505 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
508 ret = rio_add_device(rdev);
516 kfree(rswitch->route_table);
523 * rio_sport_is_active- Tests if a switch port has an active connection.
524 * @port: Master port to send transaction
525 * @destid: Associated destination ID for switch
526 * @hopcount: Hopcount to reach switch
527 * @sport: Switch port number
529 * Reads the port error status CSR for a particular switch port to
530 * determine if the port has an active link. Returns
531 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
535 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
540 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
542 while (ext_ftr_ptr) {
543 rio_mport_read_config_32(port, destid, hopcount,
544 ext_ftr_ptr, &result);
545 result = RIO_GET_BLOCK_ID(result);
546 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
547 (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
548 (result == RIO_EFB_SER_EP_FREC_ID))
551 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
556 rio_mport_read_config_32(port, destid, hopcount,
558 RIO_PORT_N_ERR_STS_CSR(sport),
561 return result & RIO_PORT_N_ERR_STS_PORT_OK;
565 * rio_lock_device - Acquires host device lock for specified device
566 * @port: Master port to send transaction
567 * @destid: Destination ID for device/switch
568 * @hopcount: Hopcount to reach switch
569 * @wait_ms: Max wait time in msec (0 = no timeout)
571 * Attepts to acquire host device lock for specified device
572 * Returns 0 if device lock acquired or EINVAL if timeout expires.
575 rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
580 /* Attempt to acquire device lock */
581 rio_mport_write_config_32(port, destid, hopcount,
582 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
583 rio_mport_read_config_32(port, destid, hopcount,
584 RIO_HOST_DID_LOCK_CSR, &result);
586 while (result != port->host_deviceid) {
587 if (wait_ms != 0 && tcnt == wait_ms) {
588 pr_debug("RIO: timeout when locking device %x:%x\n",
596 /* Try to acquire device lock again */
597 rio_mport_write_config_32(port, destid,
599 RIO_HOST_DID_LOCK_CSR,
600 port->host_deviceid);
601 rio_mport_read_config_32(port, destid,
603 RIO_HOST_DID_LOCK_CSR, &result);
610 * rio_unlock_device - Releases host device lock for specified device
611 * @port: Master port to send transaction
612 * @destid: Destination ID for device/switch
613 * @hopcount: Hopcount to reach switch
615 * Returns 0 if device lock released or EINVAL if fails.
618 rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
622 /* Release device lock */
623 rio_mport_write_config_32(port, destid,
625 RIO_HOST_DID_LOCK_CSR,
626 port->host_deviceid);
627 rio_mport_read_config_32(port, destid, hopcount,
628 RIO_HOST_DID_LOCK_CSR, &result);
629 if ((result & 0xffff) != 0xffff) {
630 pr_debug("RIO: badness when releasing device lock %x:%x\n",
639 * rio_route_add_entry- Add a route entry to a switch routing table
641 * @table: Routing table ID
642 * @route_destid: Destination ID to be routed
643 * @route_port: Port number to be routed
644 * @lock: lock switch device flag
646 * Calls the switch specific add_entry() method to add a route entry
647 * on a switch. The route table can be specified using the @table
648 * argument if a switch has per port routing tables or the normal
649 * use is to specific all tables (or the global table) by passing
650 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
654 rio_route_add_entry(struct rio_dev *rdev,
655 u16 table, u16 route_destid, u8 route_port, int lock)
660 rc = rio_lock_device(rdev->net->hport, rdev->destid,
661 rdev->hopcount, 1000);
666 rc = rdev->rswitch->add_entry(rdev->net->hport, rdev->destid,
667 rdev->hopcount, table,
668 route_destid, route_port);
670 rio_unlock_device(rdev->net->hport, rdev->destid,
677 * rio_route_get_entry- Read a route entry in a switch routing table
679 * @table: Routing table ID
680 * @route_destid: Destination ID to be routed
681 * @route_port: Pointer to read port number into
682 * @lock: lock switch device flag
684 * Calls the switch specific get_entry() method to read a route entry
685 * in a switch. The route table can be specified using the @table
686 * argument if a switch has per port routing tables or the normal
687 * use is to specific all tables (or the global table) by passing
688 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
692 rio_route_get_entry(struct rio_dev *rdev, u16 table,
693 u16 route_destid, u8 *route_port, int lock)
698 rc = rio_lock_device(rdev->net->hport, rdev->destid,
699 rdev->hopcount, 1000);
704 rc = rdev->rswitch->get_entry(rdev->net->hport, rdev->destid,
705 rdev->hopcount, table,
706 route_destid, route_port);
708 rio_unlock_device(rdev->net->hport, rdev->destid,
715 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
716 * @port: Master port to send transaction
717 * @hopcount: Number of hops to the device
719 * Used during enumeration to read the Host Device ID Lock CSR on a
720 * RIO device. Returns the value of the lock register.
722 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
726 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
727 RIO_HOST_DID_LOCK_CSR, &result);
729 return (u16) (result & 0xffff);
733 * rio_enum_peer- Recursively enumerate a RIO network through a master port
734 * @net: RIO network being enumerated
735 * @port: Master port to send transactions
736 * @hopcount: Number of hops into the network
737 * @prev: Previous RIO device connected to the enumerated one
738 * @prev_port: Port on previous RIO device
740 * Recursively enumerates a RIO network. Transactions are sent via the
741 * master port passed in @port.
743 static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
744 u8 hopcount, struct rio_dev *prev, int prev_port)
750 struct rio_dev *rdev;
755 if (rio_mport_chk_dev_access(port,
756 RIO_ANY_DESTID(port->sys_size), hopcount)) {
757 pr_debug("RIO: device access check failed\n");
761 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
762 pr_debug("RIO: PE already discovered by this host\n");
764 * Already discovered by this host. Add it as another
765 * link to the existing device.
767 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
768 hopcount, RIO_COMPONENT_TAG_CSR, ®val);
771 rdev = rio_get_comptag((regval & 0xffff), NULL);
773 if (rdev && prev && rio_is_switch(prev)) {
774 pr_debug("RIO: redundant path to %s\n",
776 prev->rswitch->nextdev[prev_port] = rdev;
783 /* Attempt to acquire device lock */
784 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
786 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
787 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
788 < port->host_deviceid) {
791 /* Attempt to acquire device lock again */
792 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
794 RIO_HOST_DID_LOCK_CSR,
795 port->host_deviceid);
798 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
800 "RIO: PE locked by a higher priority host...retreating\n");
804 /* Setup new RIO device */
805 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
808 /* Add device to the global and bus/net specific list. */
809 list_add_tail(&rdev->net_list, &net->devices);
811 if (prev && rio_is_switch(prev))
812 prev->rswitch->nextdev[prev_port] = rdev;
816 if (rio_is_switch(rdev)) {
817 sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
818 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
819 port->host_deviceid, sw_inport, 0);
820 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
822 for (destid = 0; destid < next_destid; destid++) {
823 if (destid == port->host_deviceid)
825 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
826 destid, sw_inport, 0);
827 rdev->rswitch->route_table[destid] = sw_inport;
831 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
832 rio_name(rdev), rdev->vid, rdev->did,
833 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
834 sw_destid = next_destid;
836 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
838 if (sw_inport == port_num) {
839 rio_enable_rx_tx_port(port, 0,
840 RIO_ANY_DESTID(port->sys_size),
842 rdev->rswitch->port_ok |= (1 << port_num);
846 cur_destid = next_destid;
848 if (rio_sport_is_active
849 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
852 "RIO: scanning device on port %d\n",
854 rio_enable_rx_tx_port(port, 0,
855 RIO_ANY_DESTID(port->sys_size),
857 rdev->rswitch->port_ok |= (1 << port_num);
858 rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
859 RIO_ANY_DESTID(port->sys_size),
862 if (rio_enum_peer(net, port, hopcount + 1,
866 /* Update routing tables */
867 if (next_destid > cur_destid) {
868 for (destid = cur_destid;
869 destid < next_destid; destid++) {
870 if (destid == port->host_deviceid)
872 rio_route_add_entry(rdev,
878 route_table[destid] =
883 /* If switch supports Error Management,
884 * set PORT_LOCKOUT bit for unused port
887 rio_set_port_lockout(rdev, port_num, 1);
889 rdev->rswitch->port_ok &= ~(1 << port_num);
893 /* Direct Port-write messages to the enumeratiing host */
894 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
896 rio_write_config_32(rdev,
897 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
898 (port->host_deviceid << 16) |
899 (port->sys_size << 15));
904 /* Check for empty switch */
905 if (next_destid == sw_destid) {
907 if (next_destid == port->host_deviceid)
911 rdev->destid = sw_destid;
913 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
914 rio_name(rdev), rdev->vid, rdev->did);
920 * rio_enum_complete- Tests if enumeration of a network is complete
921 * @port: Master port to send transaction
923 * Tests the PGCCSR discovered bit for non-zero value (enumeration
924 * complete flag). Return %1 if enumeration is complete or %0 if
925 * enumeration is incomplete.
927 static int rio_enum_complete(struct rio_mport *port)
931 rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
933 return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
937 * rio_disc_peer- Recursively discovers a RIO network through a master port
938 * @net: RIO network being discovered
939 * @port: Master port to send transactions
940 * @destid: Current destination ID in network
941 * @hopcount: Number of hops into the network
942 * @prev: previous rio_dev
943 * @prev_port: previous port number
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)) {
967 /* Associated destid is how we accessed this switch */
968 rdev->destid = destid;
971 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
972 rio_name(rdev), rdev->vid, rdev->did,
973 RIO_GET_TOTAL_PORTS(rdev->swpinfo));
975 port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
977 if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
980 if (rio_sport_is_active
981 (port, destid, hopcount, port_num)) {
983 "RIO: scanning device on port %d\n",
986 rio_lock_device(port, destid, hopcount, 1000);
989 ndestid < RIO_ANY_DESTID(port->sys_size);
991 rio_route_get_entry(rdev,
995 if (route_port == port_num)
999 if (ndestid == RIO_ANY_DESTID(port->sys_size))
1001 rio_unlock_device(port, destid, hopcount);
1002 if (rio_disc_peer(net, port, ndestid,
1003 hopcount + 1, rdev, port_num) < 0)
1008 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
1009 rio_name(rdev), rdev->vid, rdev->did);
1015 * rio_mport_is_active- Tests if master port link is active
1016 * @port: Master port to test
1018 * Reads the port error status CSR for the master port to
1019 * determine if the port has an active link. Returns
1020 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
1021 * or %0 if it is inactive.
1023 static int rio_mport_is_active(struct rio_mport *port)
1027 int *entry = rio_mport_phys_table;
1031 rio_mport_get_feature(port, 1, 0, 0, *entry)))
1033 } while (*++entry >= 0);
1036 rio_local_read_config_32(port,
1038 RIO_PORT_N_ERR_STS_CSR(port->index),
1041 return result & RIO_PORT_N_ERR_STS_PORT_OK;
1045 * rio_alloc_net- Allocate and configure a new RIO network
1046 * @port: Master port associated with the RIO network
1048 * Allocates a RIO network structure, initializes per-network
1049 * list heads, and adds the associated master port to the
1050 * network list of associated master ports. Returns a
1051 * RIO network pointer on success or %NULL on failure.
1053 static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
1055 struct rio_net *net;
1057 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
1059 INIT_LIST_HEAD(&net->node);
1060 INIT_LIST_HEAD(&net->devices);
1061 INIT_LIST_HEAD(&net->switches);
1062 INIT_LIST_HEAD(&net->mports);
1063 list_add_tail(&port->nnode, &net->mports);
1065 net->id = next_net++;
1071 * rio_update_route_tables- Updates route tables in switches
1072 * @net: RIO network to run update on
1074 * For each enumerated device, ensure that each switch in a system
1075 * has correct routing entries. Add routes for devices that where
1076 * unknown dirung the first enumeration pass through the switch.
1078 static void rio_update_route_tables(struct rio_net *net)
1080 struct rio_dev *rdev, *swrdev;
1081 struct rio_switch *rswitch;
1085 list_for_each_entry(rdev, &net->devices, net_list) {
1087 destid = rdev->destid;
1089 list_for_each_entry(rswitch, &net->switches, node) {
1091 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
1094 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
1095 swrdev = sw_to_rio_dev(rswitch);
1097 /* Skip if destid ends in empty switch*/
1098 if (swrdev->destid == destid)
1101 sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
1103 if (rswitch->add_entry) {
1104 rio_route_add_entry(swrdev,
1105 RIO_GLOBAL_TABLE, destid,
1107 rswitch->route_table[destid] = sport;
1115 * rio_init_em - Initializes RIO Error Management (for switches)
1118 * For each enumerated switch, call device-specific error management
1119 * initialization routine (if supplied by the switch driver).
1121 static void rio_init_em(struct rio_dev *rdev)
1123 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
1124 (rdev->rswitch->em_init)) {
1125 rdev->rswitch->em_init(rdev);
1130 * rio_pw_enable - Enables/disables port-write handling by a master port
1131 * @port: Master port associated with port-write handling
1132 * @enable: 1=enable, 0=disable
1134 static void rio_pw_enable(struct rio_mport *port, int enable)
1136 if (port->ops->pwenable)
1137 port->ops->pwenable(port, enable);
1141 * rio_enum_mport- Start enumeration through a master port
1142 * @mport: Master port to send transactions
1144 * Starts the enumeration process. If somebody has enumerated our
1145 * master port device, then give up. If not and we have an active
1146 * link, then start recursive peer enumeration. Returns %0 if
1147 * enumeration succeeds or %-EBUSY if enumeration fails.
1149 int __devinit rio_enum_mport(struct rio_mport *mport)
1151 struct rio_net *net = NULL;
1154 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1156 /* If somebody else enumerated our master port device, bail. */
1157 if (rio_enum_host(mport) < 0) {
1159 "RIO: master port %d device has been enumerated by a remote host\n",
1165 /* If master port has an active link, allocate net and enum peers */
1166 if (rio_mport_is_active(mport)) {
1167 if (!(net = rio_alloc_net(mport))) {
1168 printk(KERN_ERR "RIO: failed to allocate new net\n");
1173 /* Enable Input Output Port (transmitter reviever) */
1174 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1176 /* Set component tag for host */
1177 rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
1180 if (rio_enum_peer(net, mport, 0, NULL, 0) < 0) {
1181 /* A higher priority host won enumeration, bail. */
1183 "RIO: master port %d device has lost enumeration to a remote host\n",
1185 rio_clear_locks(net);
1189 rio_update_route_tables(net);
1190 rio_clear_locks(net);
1191 rio_pw_enable(mport, 1);
1193 printk(KERN_INFO "RIO: master port %d link inactive\n",
1203 * rio_build_route_tables- Generate route tables from switch route entries
1204 * @net: RIO network to run route tables scan on
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(struct rio_net *net)
1211 struct rio_switch *rswitch;
1212 struct rio_dev *rdev;
1216 list_for_each_entry(rswitch, &net->switches, node) {
1217 rdev = sw_to_rio_dev(rswitch);
1219 rio_lock_device(net->hport, rdev->destid,
1220 rdev->hopcount, 1000);
1222 i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
1224 if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
1227 rswitch->route_table[i] = sport;
1230 rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
1235 * rio_disc_mport- Start discovery through a master port
1236 * @mport: Master port to send transactions
1238 * Starts the discovery process. If we have an active link,
1239 * then wait for the signal that enumeration is complete.
1240 * When enumeration completion is signaled, start recursive
1241 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1244 int __devinit rio_disc_mport(struct rio_mport *mport)
1246 struct rio_net *net = NULL;
1247 unsigned long to_end;
1249 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1252 /* If master port has an active link, allocate net and discover peers */
1253 if (rio_mport_is_active(mport)) {
1254 pr_debug("RIO: wait for enumeration to complete...\n");
1256 to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1257 while (time_before(jiffies, to_end)) {
1258 if (rio_enum_complete(mport))
1260 schedule_timeout_uninterruptible(msecs_to_jiffies(10));
1263 pr_debug("RIO: discovery timeout on mport %d %s\n",
1264 mport->id, mport->name);
1267 pr_debug("RIO: ... enumeration done\n");
1269 net = rio_alloc_net(mport);
1271 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1275 /* Read DestID assigned by enumerator */
1276 rio_local_read_config_32(mport, RIO_DID_CSR,
1277 &mport->host_deviceid);
1278 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1279 mport->host_deviceid);
1281 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1284 "RIO: master port %d device has failed discovery\n",
1289 rio_build_route_tables(net);