2 * RapidIO enumeration and discovery support
4 * Copyright 2005 MontaVista Software, Inc.
5 * Matt Porter <mporter@kernel.crashing.org>
7 * Copyright 2009 Integrated Device Technology, Inc.
8 * Alex Bounine <alexandre.bounine@idt.com>
9 * - Added Port-Write/Error Management initialization and handling
11 * Copyright 2009 Sysgo AG
12 * Thomas Moll <thomas.moll@sysgo.com>
13 * - Added Input- Output- enable functionality, to allow full communication
15 * This program is free software; you can redistribute it and/or modify it
16 * under the terms of the GNU General Public License as published by the
17 * Free Software Foundation; either version 2 of the License, or (at your
18 * option) any later version.
21 #include <linux/types.h>
22 #include <linux/kernel.h>
24 #include <linux/delay.h>
25 #include <linux/dma-mapping.h>
26 #include <linux/init.h>
27 #include <linux/rio.h>
28 #include <linux/rio_drv.h>
29 #include <linux/rio_ids.h>
30 #include <linux/rio_regs.h>
31 #include <linux/module.h>
32 #include <linux/spinlock.h>
33 #include <linux/timer.h>
34 #include <linux/jiffies.h>
35 #include <linux/slab.h>
39 LIST_HEAD(rio_devices);
40 static LIST_HEAD(rio_switches);
42 static void rio_enum_timeout(unsigned long);
44 static void rio_init_em(struct rio_dev *rdev);
46 DEFINE_SPINLOCK(rio_global_list_lock);
48 static int next_destid = 0;
49 static int next_switchid = 0;
50 static int next_net = 0;
51 static int next_comptag;
53 static struct timer_list rio_enum_timer =
54 TIMER_INITIALIZER(rio_enum_timeout, 0, 0);
56 static int rio_mport_phys_table[] = {
58 RIO_EFB_PAR_EP_REC_ID,
60 RIO_EFB_SER_EP_REC_ID,
65 * rio_get_device_id - Get the base/extended device id for a device
66 * @port: RIO master port
67 * @destid: Destination ID of device
68 * @hopcount: Hopcount to device
70 * Reads the base/extended device id from a device. Returns the
73 static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
77 rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
79 return RIO_GET_DID(port->sys_size, result);
83 * rio_set_device_id - Set the base/extended device id for a device
84 * @port: RIO master port
85 * @destid: Destination ID of device
86 * @hopcount: Hopcount to device
87 * @did: Device ID value to be written
89 * Writes the base/extended device id from a device.
91 static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
93 rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
94 RIO_SET_DID(port->sys_size, did));
98 * rio_local_set_device_id - Set the base/extended device id for a port
99 * @port: RIO master port
100 * @did: Device ID value to be written
102 * Writes the base/extended device id from a device.
104 static void rio_local_set_device_id(struct rio_mport *port, u16 did)
106 rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
111 * rio_clear_locks- Release all host locks and signal enumeration complete
112 * @port: Master port to issue transaction
114 * Marks the component tag CSR on each device with the enumeration
115 * complete flag. When complete, it then release the host locks on
116 * each device. Returns 0 on success or %-EINVAL on failure.
118 static int rio_clear_locks(struct rio_mport *port)
120 struct rio_dev *rdev;
124 /* Assign component tag to all devices */
126 rio_local_write_config_32(port, RIO_COMPONENT_TAG_CSR, next_comptag++);
128 list_for_each_entry(rdev, &rio_devices, global_list) {
129 /* Mark device as discovered */
130 rio_read_config_32(rdev,
131 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
133 rio_write_config_32(rdev,
134 rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
135 result | RIO_PORT_GEN_DISCOVERED);
137 rio_write_config_32(rdev, RIO_COMPONENT_TAG_CSR, next_comptag);
138 rdev->comp_tag = next_comptag++;
139 if (next_comptag >= 0x10000) {
140 pr_err("RIO: Component Tag Counter Overflow\n");
145 /* Release host device id locks */
146 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
147 port->host_deviceid);
148 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
149 if ((result & 0xffff) != 0xffff) {
151 "RIO: badness when releasing host lock on master port, result %8.8x\n",
155 list_for_each_entry(rdev, &rio_devices, global_list) {
156 rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
157 port->host_deviceid);
158 rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
159 if ((result & 0xffff) != 0xffff) {
161 "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
162 rdev->vid, rdev->did);
171 * rio_enum_host- Set host lock and initialize host destination ID
172 * @port: Master port to issue transaction
174 * Sets the local host master port lock and destination ID register
175 * with the host device ID value. The host device ID value is provided
176 * by the platform. Returns %0 on success or %-1 on failure.
178 static int rio_enum_host(struct rio_mport *port)
182 /* Set master port host device id lock */
183 rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
184 port->host_deviceid);
186 rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
187 if ((result & 0xffff) != port->host_deviceid)
190 /* Set master port destid and init destid ctr */
191 rio_local_set_device_id(port, port->host_deviceid);
193 if (next_destid == port->host_deviceid)
200 * rio_device_has_destid- Test if a device contains a destination ID register
201 * @port: Master port to issue transaction
202 * @src_ops: RIO device source operations
203 * @dst_ops: RIO device destination operations
205 * Checks the provided @src_ops and @dst_ops for the necessary transaction
206 * capabilities that indicate whether or not a device will implement a
207 * destination ID register. Returns 1 if true or 0 if false.
209 static int rio_device_has_destid(struct rio_mport *port, int src_ops,
212 u32 mask = RIO_OPS_READ | RIO_OPS_WRITE | RIO_OPS_ATOMIC_TST_SWP | RIO_OPS_ATOMIC_INC | RIO_OPS_ATOMIC_DEC | RIO_OPS_ATOMIC_SET | RIO_OPS_ATOMIC_CLR;
214 return !!((src_ops | dst_ops) & mask);
218 * rio_release_dev- Frees a RIO device struct
219 * @dev: LDM device associated with a RIO device struct
221 * Gets the RIO device struct associated a RIO device struct.
222 * The RIO device struct is freed.
224 static void rio_release_dev(struct device *dev)
226 struct rio_dev *rdev;
228 rdev = to_rio_dev(dev);
233 * rio_is_switch- Tests if a RIO device has switch capabilities
236 * Gets the RIO device Processing Element Features register
237 * contents and tests for switch capabilities. Returns 1 if
238 * the device is a switch or 0 if it is not a switch.
239 * The RIO device struct is freed.
241 static int rio_is_switch(struct rio_dev *rdev)
243 if (rdev->pef & RIO_PEF_SWITCH)
249 * rio_switch_init - Sets switch operations for a particular vendor switch
251 * @do_enum: Enumeration/Discovery mode flag
253 * Searches the RIO switch ops table for known switch types. If the vid
254 * and did match a switch table entry, then call switch initialization
255 * routine to setup switch-specific routines.
257 static void rio_switch_init(struct rio_dev *rdev, int do_enum)
259 struct rio_switch_ops *cur = __start_rio_switch_ops;
260 struct rio_switch_ops *end = __end_rio_switch_ops;
263 if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
264 pr_debug("RIO: calling init routine for %s\n",
266 cur->init_hook(rdev, do_enum);
272 if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) {
273 pr_debug("RIO: adding STD routing ops for %s\n",
275 rdev->rswitch->add_entry = rio_std_route_add_entry;
276 rdev->rswitch->get_entry = rio_std_route_get_entry;
277 rdev->rswitch->clr_table = rio_std_route_clr_table;
280 if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
281 printk(KERN_ERR "RIO: missing routing ops for %s\n",
286 * rio_add_device- Adds a RIO device to the device model
289 * Adds the RIO device to the global device list and adds the RIO
290 * device to the RIO device list. Creates the generic sysfs nodes
293 static int __devinit rio_add_device(struct rio_dev *rdev)
297 err = device_add(&rdev->dev);
301 spin_lock(&rio_global_list_lock);
302 list_add_tail(&rdev->global_list, &rio_devices);
303 spin_unlock(&rio_global_list_lock);
305 rio_create_sysfs_dev_files(rdev);
311 * rio_enable_rx_tx_port - enable input reciever and output transmitter of
313 * @port: Master port associated with the RIO network
314 * @local: local=1 select local port otherwise a far device is reached
315 * @destid: Destination ID of the device to check host bit
316 * @hopcount: Number of hops to reach the target
317 * @port_num: Port (-number on switch) to enable on a far end device
319 * Returns 0 or 1 from on General Control Command and Status Register
322 inline int rio_enable_rx_tx_port(struct rio_mport *port,
323 int local, u16 destid,
324 u8 hopcount, u8 port_num) {
325 #ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
330 * enable rx input tx output port
332 pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
333 "%d, port_num = %d)\n", local, destid, hopcount, port_num);
335 ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
338 rio_local_read_config_32(port, ext_ftr_ptr +
339 RIO_PORT_N_CTL_CSR(0),
342 if (rio_mport_read_config_32(port, destid, hopcount,
343 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), ®val) < 0)
347 if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
349 regval = regval | RIO_PORT_N_CTL_EN_RX_SER
350 | RIO_PORT_N_CTL_EN_TX_SER;
353 regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
354 | RIO_PORT_N_CTL_EN_TX_PAR;
358 rio_local_write_config_32(port, ext_ftr_ptr +
359 RIO_PORT_N_CTL_CSR(0), regval);
361 if (rio_mport_write_config_32(port, destid, hopcount,
362 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
370 * rio_setup_device- Allocates and sets up a RIO device
372 * @port: Master port to send transactions
373 * @destid: Current destination ID
374 * @hopcount: Current hopcount
375 * @do_enum: Enumeration/Discovery mode flag
377 * Allocates a RIO device and configures fields based on configuration
378 * space contents. If device has a destination ID register, a destination
379 * ID is either assigned in enumeration mode or read from configuration
380 * space in discovery mode. If the device has switch capabilities, then
381 * a switch is allocated and configured appropriately. Returns a pointer
382 * to a RIO device on success or NULL on failure.
385 static struct rio_dev __devinit *rio_setup_device(struct rio_net *net,
386 struct rio_mport *port, u16 destid,
387 u8 hopcount, int do_enum)
390 struct rio_dev *rdev;
391 struct rio_switch *rswitch = NULL;
394 rdev = kzalloc(sizeof(struct rio_dev), GFP_KERNEL);
399 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
401 rdev->did = result >> 16;
402 rdev->vid = result & 0xffff;
403 rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
405 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
407 rdev->asm_did = result >> 16;
408 rdev->asm_vid = result & 0xffff;
409 rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
411 rdev->asm_rev = result >> 16;
412 rio_mport_read_config_32(port, destid, hopcount, RIO_PEF_CAR,
414 if (rdev->pef & RIO_PEF_EXT_FEATURES) {
415 rdev->efptr = result & 0xffff;
416 rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
419 rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
420 hopcount, RIO_EFB_ERR_MGMNT);
423 rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
425 rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
428 if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
430 rio_set_device_id(port, destid, hopcount, next_destid);
431 rdev->destid = next_destid++;
432 if (next_destid == port->host_deviceid)
435 rdev->destid = rio_get_device_id(port, destid, hopcount);
437 /* Switch device has an associated destID */
438 rdev->destid = RIO_INVALID_DESTID;
440 /* If a PE has both switch and other functions, show it as a switch */
441 if (rio_is_switch(rdev)) {
442 rio_mport_read_config_32(port, destid, hopcount,
443 RIO_SWP_INFO_CAR, &rdev->swpinfo);
444 rswitch = kzalloc(sizeof(struct rio_switch), GFP_KERNEL);
447 rswitch->switchid = next_switchid;
448 rswitch->hopcount = hopcount;
449 rswitch->destid = destid;
450 rswitch->port_ok = 0;
451 rswitch->route_table = kzalloc(sizeof(u8)*
452 RIO_MAX_ROUTE_ENTRIES(port->sys_size),
454 if (!rswitch->route_table)
456 /* Initialize switch route table */
457 for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
459 rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
460 rdev->rswitch = rswitch;
461 dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
462 rdev->rswitch->switchid);
463 rio_switch_init(rdev, do_enum);
465 if (do_enum && rdev->rswitch->clr_table)
466 rdev->rswitch->clr_table(port, destid, hopcount,
469 list_add_tail(&rswitch->node, &rio_switches);
473 /*Enable Input Output Port (transmitter reviever)*/
474 rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
476 dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
480 rdev->dev.bus = &rio_bus_type;
481 rdev->dev.parent = &rio_bus;
483 device_initialize(&rdev->dev);
484 rdev->dev.release = rio_release_dev;
487 rdev->dma_mask = DMA_BIT_MASK(32);
488 rdev->dev.dma_mask = &rdev->dma_mask;
489 rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
491 if ((rdev->pef & RIO_PEF_INB_DOORBELL) &&
492 (rdev->dst_ops & RIO_DST_OPS_DOORBELL))
493 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
496 ret = rio_add_device(rdev);
504 kfree(rswitch->route_table);
512 * rio_sport_is_active- Tests if a switch port has an active connection.
513 * @port: Master port to send transaction
514 * @destid: Associated destination ID for switch
515 * @hopcount: Hopcount to reach switch
516 * @sport: Switch port number
518 * Reads the port error status CSR for a particular switch port to
519 * determine if the port has an active link. Returns
520 * %RIO_PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
524 rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
529 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
531 while (ext_ftr_ptr) {
532 rio_mport_read_config_32(port, destid, hopcount,
533 ext_ftr_ptr, &result);
534 result = RIO_GET_BLOCK_ID(result);
535 if ((result == RIO_EFB_SER_EP_FREE_ID) ||
536 (result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
537 (result == RIO_EFB_SER_EP_FREC_ID))
540 ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
545 rio_mport_read_config_32(port, destid, hopcount,
547 RIO_PORT_N_ERR_STS_CSR(sport),
550 return result & RIO_PORT_N_ERR_STS_PORT_OK;
554 * rio_lock_device - Acquires host device lock for specified device
555 * @port: Master port to send transaction
556 * @destid: Destination ID for device/switch
557 * @hopcount: Hopcount to reach switch
558 * @wait_ms: Max wait time in msec (0 = no timeout)
560 * Attepts to acquire host device lock for specified device
561 * Returns 0 if device lock acquired or EINVAL if timeout expires.
564 rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
569 /* Attempt to acquire device lock */
570 rio_mport_write_config_32(port, destid, hopcount,
571 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
572 rio_mport_read_config_32(port, destid, hopcount,
573 RIO_HOST_DID_LOCK_CSR, &result);
575 while (result != port->host_deviceid) {
576 if (wait_ms != 0 && tcnt == wait_ms) {
577 pr_debug("RIO: timeout when locking device %x:%x\n",
585 /* Try to acquire device lock again */
586 rio_mport_write_config_32(port, destid,
588 RIO_HOST_DID_LOCK_CSR,
589 port->host_deviceid);
590 rio_mport_read_config_32(port, destid,
592 RIO_HOST_DID_LOCK_CSR, &result);
599 * rio_unlock_device - Releases host device lock for specified device
600 * @port: Master port to send transaction
601 * @destid: Destination ID for device/switch
602 * @hopcount: Hopcount to reach switch
604 * Returns 0 if device lock released or EINVAL if fails.
607 rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
611 /* Release device lock */
612 rio_mport_write_config_32(port, destid,
614 RIO_HOST_DID_LOCK_CSR,
615 port->host_deviceid);
616 rio_mport_read_config_32(port, destid, hopcount,
617 RIO_HOST_DID_LOCK_CSR, &result);
618 if ((result & 0xffff) != 0xffff) {
619 pr_debug("RIO: badness when releasing device lock %x:%x\n",
628 * rio_route_add_entry- Add a route entry to a switch routing table
629 * @mport: Master port to send transaction
630 * @rswitch: Switch device
631 * @table: Routing table ID
632 * @route_destid: Destination ID to be routed
633 * @route_port: Port number to be routed
634 * @lock: lock switch device flag
636 * Calls the switch specific add_entry() method to add a route entry
637 * on a switch. The route table can be specified using the @table
638 * argument if a switch has per port routing tables or the normal
639 * use is to specific all tables (or the global table) by passing
640 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
644 rio_route_add_entry(struct rio_mport *mport, struct rio_switch *rswitch,
645 u16 table, u16 route_destid, u8 route_port, int lock)
650 rc = rio_lock_device(mport, rswitch->destid,
651 rswitch->hopcount, 1000);
656 rc = rswitch->add_entry(mport, rswitch->destid,
657 rswitch->hopcount, table,
658 route_destid, route_port);
660 rio_unlock_device(mport, rswitch->destid, rswitch->hopcount);
666 * rio_route_get_entry- Read a route entry in a switch routing table
667 * @mport: Master port to send transaction
668 * @rswitch: Switch device
669 * @table: Routing table ID
670 * @route_destid: Destination ID to be routed
671 * @route_port: Pointer to read port number into
672 * @lock: lock switch device flag
674 * Calls the switch specific get_entry() method to read a route entry
675 * in a switch. The route table can be specified using the @table
676 * argument if a switch has per port routing tables or the normal
677 * use is to specific all tables (or the global table) by passing
678 * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
682 rio_route_get_entry(struct rio_mport *mport, struct rio_switch *rswitch, u16 table,
683 u16 route_destid, u8 *route_port, int lock)
688 rc = rio_lock_device(mport, rswitch->destid,
689 rswitch->hopcount, 1000);
694 rc = rswitch->get_entry(mport, rswitch->destid,
695 rswitch->hopcount, table,
696 route_destid, route_port);
698 rio_unlock_device(mport, rswitch->destid, rswitch->hopcount);
704 * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device
705 * @port: Master port to send transaction
706 * @hopcount: Number of hops to the device
708 * Used during enumeration to read the Host Device ID Lock CSR on a
709 * RIO device. Returns the value of the lock register.
711 static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount)
715 rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size), hopcount,
716 RIO_HOST_DID_LOCK_CSR, &result);
718 return (u16) (result & 0xffff);
722 * rio_get_swpinfo_inport- Gets the ingress port number
723 * @mport: Master port to send transaction
724 * @destid: Destination ID associated with the switch
725 * @hopcount: Number of hops to the device
727 * Returns port number being used to access the switch device.
730 rio_get_swpinfo_inport(struct rio_mport *mport, u16 destid, u8 hopcount)
734 rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR,
737 return (u8) (result & 0xff);
741 * rio_get_swpinfo_tports- Gets total number of ports on the switch
742 * @mport: Master port to send transaction
743 * @destid: Destination ID associated with the switch
744 * @hopcount: Number of hops to the device
746 * Returns total numbers of ports implemented by the switch device.
748 static u8 rio_get_swpinfo_tports(struct rio_mport *mport, u16 destid,
753 rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR,
756 return RIO_GET_TOTAL_PORTS(result);
760 * rio_net_add_mport- Add a master port to a RIO network
762 * @port: Master port to add
764 * Adds a master port to the network list of associated master
767 static void rio_net_add_mport(struct rio_net *net, struct rio_mport *port)
769 spin_lock(&rio_global_list_lock);
770 list_add_tail(&port->nnode, &net->mports);
771 spin_unlock(&rio_global_list_lock);
775 * rio_enum_peer- Recursively enumerate a RIO network through a master port
776 * @net: RIO network being enumerated
777 * @port: Master port to send transactions
778 * @hopcount: Number of hops into the network
780 * Recursively enumerates a RIO network. Transactions are sent via the
781 * master port passed in @port.
783 static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
791 struct rio_dev *rdev;
795 if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) {
796 pr_debug("RIO: PE already discovered by this host\n");
798 * Already discovered by this host. Add it as another
799 * master port for the current network.
801 rio_net_add_mport(net, port);
805 /* Attempt to acquire device lock */
806 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
808 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
809 while ((tmp = rio_get_host_deviceid_lock(port, hopcount))
810 < port->host_deviceid) {
813 /* Attempt to acquire device lock again */
814 rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
816 RIO_HOST_DID_LOCK_CSR,
817 port->host_deviceid);
820 if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) {
822 "RIO: PE locked by a higher priority host...retreating\n");
826 /* Setup new RIO device */
827 rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
830 /* Add device to the global and bus/net specific list. */
831 list_add_tail(&rdev->net_list, &net->devices);
835 if (rio_is_switch(rdev)) {
837 sw_inport = rio_get_swpinfo_inport(port,
838 RIO_ANY_DESTID(port->sys_size), hopcount);
839 rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
840 port->host_deviceid, sw_inport, 0);
841 rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
843 for (destid = 0; destid < next_destid; destid++) {
844 if (destid == port->host_deviceid)
846 rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE,
847 destid, sw_inport, 0);
848 rdev->rswitch->route_table[destid] = sw_inport;
852 rio_get_swpinfo_tports(port, RIO_ANY_DESTID(port->sys_size),
855 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
856 rio_name(rdev), rdev->vid, rdev->did, num_ports);
857 sw_destid = next_destid;
858 for (port_num = 0; port_num < num_ports; port_num++) {
859 /*Enable Input Output Port (transmitter reviever)*/
860 rio_enable_rx_tx_port(port, 0,
861 RIO_ANY_DESTID(port->sys_size),
864 if (sw_inport == port_num) {
865 rdev->rswitch->port_ok |= (1 << port_num);
869 cur_destid = next_destid;
871 if (rio_sport_is_active
872 (port, RIO_ANY_DESTID(port->sys_size), hopcount,
875 "RIO: scanning device on port %d\n",
877 rdev->rswitch->port_ok |= (1 << port_num);
878 rio_route_add_entry(port, rdev->rswitch,
880 RIO_ANY_DESTID(port->sys_size),
883 if (rio_enum_peer(net, port, hopcount + 1) < 0)
886 /* Update routing tables */
887 if (next_destid > cur_destid) {
888 for (destid = cur_destid;
889 destid < next_destid; destid++) {
890 if (destid == port->host_deviceid)
892 rio_route_add_entry(port, rdev->rswitch,
898 route_table[destid] =
903 /* If switch supports Error Management,
904 * set PORT_LOCKOUT bit for unused port
907 rio_set_port_lockout(rdev, port_num, 1);
909 rdev->rswitch->port_ok &= ~(1 << port_num);
913 /* Direct Port-write messages to the enumeratiing host */
914 if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
916 rio_write_config_32(rdev,
917 rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
918 (port->host_deviceid << 16) |
919 (port->sys_size << 15));
924 /* Check for empty switch */
925 if (next_destid == sw_destid) {
927 if (next_destid == port->host_deviceid)
931 rdev->rswitch->destid = sw_destid;
933 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
934 rio_name(rdev), rdev->vid, rdev->did);
940 * rio_enum_complete- Tests if enumeration of a network is complete
941 * @port: Master port to send transaction
943 * Tests the Component Tag CSR for non-zero value (enumeration
944 * complete flag). Return %1 if enumeration is complete or %0 if
945 * enumeration is incomplete.
947 static int rio_enum_complete(struct rio_mport *port)
951 rio_local_read_config_32(port, RIO_COMPONENT_TAG_CSR, &tag_csr);
952 return (tag_csr & 0xffff) ? 1 : 0;
956 * rio_disc_peer- Recursively discovers a RIO network through a master port
957 * @net: RIO network being discovered
958 * @port: Master port to send transactions
959 * @destid: Current destination ID in network
960 * @hopcount: Number of hops into the network
962 * Recursively discovers a RIO network. Transactions are sent via the
963 * master port passed in @port.
966 rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid,
969 u8 port_num, route_port;
971 struct rio_dev *rdev;
974 /* Setup new RIO device */
975 if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
976 /* Add device to the global and bus/net specific list. */
977 list_add_tail(&rdev->net_list, &net->devices);
981 if (rio_is_switch(rdev)) {
984 /* Associated destid is how we accessed this switch */
985 rdev->rswitch->destid = destid;
987 num_ports = rio_get_swpinfo_tports(port, destid, hopcount);
989 "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
990 rio_name(rdev), rdev->vid, rdev->did, num_ports);
991 for (port_num = 0; port_num < num_ports; port_num++) {
992 if (rio_get_swpinfo_inport(port, destid, hopcount) ==
996 if (rio_sport_is_active
997 (port, destid, hopcount, port_num)) {
999 "RIO: scanning device on port %d\n",
1002 rio_lock_device(port, destid, hopcount, 1000);
1005 ndestid < RIO_ANY_DESTID(port->sys_size);
1007 rio_route_get_entry(port, rdev->rswitch,
1011 if (route_port == port_num)
1015 rio_unlock_device(port, destid, hopcount);
1017 (net, port, ndestid, hopcount + 1) < 0)
1022 pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n",
1023 rio_name(rdev), rdev->vid, rdev->did);
1029 * rio_mport_is_active- Tests if master port link is active
1030 * @port: Master port to test
1032 * Reads the port error status CSR for the master port to
1033 * determine if the port has an active link. Returns
1034 * %RIO_PORT_N_ERR_STS_PORT_OK if the master port is active
1035 * or %0 if it is inactive.
1037 static int rio_mport_is_active(struct rio_mport *port)
1041 int *entry = rio_mport_phys_table;
1045 rio_mport_get_feature(port, 1, 0, 0, *entry)))
1047 } while (*++entry >= 0);
1050 rio_local_read_config_32(port,
1052 RIO_PORT_N_ERR_STS_CSR(port->index),
1055 return result & RIO_PORT_N_ERR_STS_PORT_OK;
1059 * rio_alloc_net- Allocate and configure a new RIO network
1060 * @port: Master port associated with the RIO network
1062 * Allocates a RIO network structure, initializes per-network
1063 * list heads, and adds the associated master port to the
1064 * network list of associated master ports. Returns a
1065 * RIO network pointer on success or %NULL on failure.
1067 static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port)
1069 struct rio_net *net;
1071 net = kzalloc(sizeof(struct rio_net), GFP_KERNEL);
1073 INIT_LIST_HEAD(&net->node);
1074 INIT_LIST_HEAD(&net->devices);
1075 INIT_LIST_HEAD(&net->mports);
1076 list_add_tail(&port->nnode, &net->mports);
1078 net->id = next_net++;
1084 * rio_update_route_tables- Updates route tables in switches
1085 * @port: Master port associated with the RIO network
1087 * For each enumerated device, ensure that each switch in a system
1088 * has correct routing entries. Add routes for devices that where
1089 * unknown dirung the first enumeration pass through the switch.
1091 static void rio_update_route_tables(struct rio_mport *port)
1093 struct rio_dev *rdev;
1094 struct rio_switch *rswitch;
1098 list_for_each_entry(rdev, &rio_devices, global_list) {
1100 destid = (rio_is_switch(rdev))?rdev->rswitch->destid:rdev->destid;
1102 list_for_each_entry(rswitch, &rio_switches, node) {
1104 if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
1107 if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
1108 /* Skip if destid ends in empty switch*/
1109 if (rswitch->destid == destid)
1112 sport = rio_get_swpinfo_inport(port,
1113 rswitch->destid, rswitch->hopcount);
1115 if (rswitch->add_entry) {
1116 rio_route_add_entry(port, rswitch,
1117 RIO_GLOBAL_TABLE, destid,
1119 rswitch->route_table[destid] = sport;
1127 * rio_init_em - Initializes RIO Error Management (for switches)
1130 * For each enumerated switch, call device-specific error management
1131 * initialization routine (if supplied by the switch driver).
1133 static void rio_init_em(struct rio_dev *rdev)
1135 if (rio_is_switch(rdev) && (rdev->em_efptr) &&
1136 (rdev->rswitch->em_init)) {
1137 rdev->rswitch->em_init(rdev);
1142 * rio_pw_enable - Enables/disables port-write handling by a master port
1143 * @port: Master port associated with port-write handling
1144 * @enable: 1=enable, 0=disable
1146 static void rio_pw_enable(struct rio_mport *port, int enable)
1148 if (port->ops->pwenable)
1149 port->ops->pwenable(port, enable);
1153 * rio_enum_mport- Start enumeration through a master port
1154 * @mport: Master port to send transactions
1156 * Starts the enumeration process. If somebody has enumerated our
1157 * master port device, then give up. If not and we have an active
1158 * link, then start recursive peer enumeration. Returns %0 if
1159 * enumeration succeeds or %-EBUSY if enumeration fails.
1161 int __devinit rio_enum_mport(struct rio_mport *mport)
1163 struct rio_net *net = NULL;
1166 printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
1168 /* If somebody else enumerated our master port device, bail. */
1169 if (rio_enum_host(mport) < 0) {
1171 "RIO: master port %d device has been enumerated by a remote host\n",
1177 /* If master port has an active link, allocate net and enum peers */
1178 if (rio_mport_is_active(mport)) {
1179 if (!(net = rio_alloc_net(mport))) {
1180 printk(KERN_ERR "RIO: failed to allocate new net\n");
1185 /* Enable Input Output Port (transmitter reviever) */
1186 rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
1188 if (rio_enum_peer(net, mport, 0) < 0) {
1189 /* A higher priority host won enumeration, bail. */
1191 "RIO: master port %d device has lost enumeration to a remote host\n",
1193 rio_clear_locks(mport);
1197 rio_update_route_tables(mport);
1198 rio_clear_locks(mport);
1199 rio_pw_enable(mport, 1);
1201 printk(KERN_INFO "RIO: master port %d link inactive\n",
1211 * rio_build_route_tables- Generate route tables from switch route entries
1213 * For each switch device, generate a route table by copying existing
1214 * route entries from the switch.
1216 static void rio_build_route_tables(void)
1218 struct rio_dev *rdev;
1222 list_for_each_entry(rdev, &rio_devices, global_list)
1223 if (rio_is_switch(rdev)) {
1224 rio_lock_device(rdev->net->hport, rdev->rswitch->destid,
1225 rdev->rswitch->hopcount, 1000);
1227 i < RIO_MAX_ROUTE_ENTRIES(rdev->net->hport->sys_size);
1229 if (rio_route_get_entry
1230 (rdev->net->hport, rdev->rswitch,
1231 RIO_GLOBAL_TABLE, i, &sport, 0) < 0)
1233 rdev->rswitch->route_table[i] = sport;
1236 rio_unlock_device(rdev->net->hport,
1237 rdev->rswitch->destid,
1238 rdev->rswitch->hopcount);
1243 * rio_enum_timeout- Signal that enumeration timed out
1244 * @data: Address of timeout flag.
1246 * When the enumeration complete timer expires, set a flag that
1247 * signals to the discovery process that enumeration did not
1248 * complete in a sane amount of time.
1250 static void rio_enum_timeout(unsigned long data)
1252 /* Enumeration timed out, set flag */
1257 * rio_disc_mport- Start discovery through a master port
1258 * @mport: Master port to send transactions
1260 * Starts the discovery process. If we have an active link,
1261 * then wait for the signal that enumeration is complete.
1262 * When enumeration completion is signaled, start recursive
1263 * peer discovery. Returns %0 if discovery succeeds or %-EBUSY
1266 int __devinit rio_disc_mport(struct rio_mport *mport)
1268 struct rio_net *net = NULL;
1269 int enum_timeout_flag = 0;
1271 printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id,
1274 /* If master port has an active link, allocate net and discover peers */
1275 if (rio_mport_is_active(mport)) {
1276 if (!(net = rio_alloc_net(mport))) {
1277 printk(KERN_ERR "RIO: Failed to allocate new net\n");
1281 pr_debug("RIO: wait for enumeration complete...");
1283 rio_enum_timer.expires =
1284 jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
1285 rio_enum_timer.data = (unsigned long)&enum_timeout_flag;
1286 add_timer(&rio_enum_timer);
1287 while (!rio_enum_complete(mport)) {
1289 if (enum_timeout_flag) {
1290 del_timer_sync(&rio_enum_timer);
1294 del_timer_sync(&rio_enum_timer);
1298 /* Read DestID assigned by enumerator */
1299 rio_local_read_config_32(mport, RIO_DID_CSR,
1300 &mport->host_deviceid);
1301 mport->host_deviceid = RIO_GET_DID(mport->sys_size,
1302 mport->host_deviceid);
1304 if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
1307 "RIO: master port %d device has failed discovery\n",
1312 rio_build_route_tables();
1318 pr_debug("timeout\n");