/* * RapidIO enumeration and discovery support * * Copyright 2005 MontaVista Software, Inc. * Matt Porter <mporter@kernel.crashing.org> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #include <linux/types.h> #include <linux/kernel.h> #include <linux/delay.h> #include <linux/dma-mapping.h> #include <linux/init.h> #include <linux/rio.h> #include <linux/rio_drv.h> #include <linux/rio_ids.h> #include <linux/rio_regs.h> #include <linux/module.h> #include <linux/spinlock.h> #include <linux/timer.h> #include <linux/jiffies.h> #include <linux/slab.h> #include "rio.h" LIST_HEAD(rio_devices); static LIST_HEAD(rio_switches); #define RIO_ENUM_CMPL_MAGIC 0xdeadbeef static void rio_enum_timeout(unsigned long); DEFINE_SPINLOCK(rio_global_list_lock); static int next_destid = 0; static int next_switchid = 0; static int next_net = 0; static struct timer_list rio_enum_timer = TIMER_INITIALIZER(rio_enum_timeout, 0, 0); static int rio_mport_phys_table[] = { RIO_EFB_PAR_EP_ID, RIO_EFB_PAR_EP_REC_ID, RIO_EFB_SER_EP_ID, RIO_EFB_SER_EP_REC_ID, -1, }; static int rio_sport_phys_table[] = { RIO_EFB_PAR_EP_FREE_ID, RIO_EFB_SER_EP_FREE_ID, -1, }; /** * rio_get_device_id - Get the base/extended device id for a device * @port: RIO master port * @destid: Destination ID of device * @hopcount: Hopcount to device * * Reads the base/extended device id from a device. Returns the * 8/16-bit device ID. */ static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount) { u32 result; rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result); return RIO_GET_DID(result); } /** * rio_set_device_id - Set the base/extended device id for a device * @port: RIO master port * @destid: Destination ID of device * @hopcount: Hopcount to device * @did: Device ID value to be written * * Writes the base/extended device id from a device. */ static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did) { rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR, RIO_SET_DID(did)); } /** * rio_local_set_device_id - Set the base/extended device id for a port * @port: RIO master port * @did: Device ID value to be written * * Writes the base/extended device id from a device. */ static void rio_local_set_device_id(struct rio_mport *port, u16 did) { rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(did)); } /** * rio_clear_locks- Release all host locks and signal enumeration complete * @port: Master port to issue transaction * * Marks the component tag CSR on each device with the enumeration * complete flag. When complete, it then release the host locks on * each device. Returns 0 on success or %-EINVAL on failure. */ static int rio_clear_locks(struct rio_mport *port) { struct rio_dev *rdev; u32 result; int ret = 0; /* Write component tag CSR magic complete value */ rio_local_write_config_32(port, RIO_COMPONENT_TAG_CSR, RIO_ENUM_CMPL_MAGIC); list_for_each_entry(rdev, &rio_devices, global_list) rio_write_config_32(rdev, RIO_COMPONENT_TAG_CSR, RIO_ENUM_CMPL_MAGIC); /* Release host device id locks */ rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, port->host_deviceid); rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result); if ((result & 0xffff) != 0xffff) { printk(KERN_INFO "RIO: badness when releasing host lock on master port, result %8.8x\n", result); ret = -EINVAL; } list_for_each_entry(rdev, &rio_devices, global_list) { rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR, port->host_deviceid); rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result); if ((result & 0xffff) != 0xffff) { printk(KERN_INFO "RIO: badness when releasing host lock on vid %4.4x did %4.4x\n", rdev->vid, rdev->did); ret = -EINVAL; } } return ret; } /** * rio_enum_host- Set host lock and initialize host destination ID * @port: Master port to issue transaction * * Sets the local host master port lock and destination ID register * with the host device ID value. The host device ID value is provided * by the platform. Returns %0 on success or %-1 on failure. */ static int rio_enum_host(struct rio_mport *port) { u32 result; /* Set master port host device id lock */ rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR, port->host_deviceid); rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result); if ((result & 0xffff) != port->host_deviceid) return -1; /* Set master port destid and init destid ctr */ rio_local_set_device_id(port, port->host_deviceid); if (next_destid == port->host_deviceid) next_destid++; return 0; } /** * rio_device_has_destid- Test if a device contains a destination ID register * @port: Master port to issue transaction * @src_ops: RIO device source operations * @dst_ops: RIO device destination operations * * Checks the provided @src_ops and @dst_ops for the necessary transaction * capabilities that indicate whether or not a device will implement a * destination ID register. Returns 1 if true or 0 if false. */ static int rio_device_has_destid(struct rio_mport *port, int src_ops, int dst_ops) { 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; return !!((src_ops | dst_ops) & mask); } /** * rio_release_dev- Frees a RIO device struct * @dev: LDM device associated with a RIO device struct * * Gets the RIO device struct associated a RIO device struct. * The RIO device struct is freed. */ static void rio_release_dev(struct device *dev) { struct rio_dev *rdev; rdev = to_rio_dev(dev); kfree(rdev); } /** * rio_is_switch- Tests if a RIO device has switch capabilities * @rdev: RIO device * * Gets the RIO device Processing Element Features register * contents and tests for switch capabilities. Returns 1 if * the device is a switch or 0 if it is not a switch. * The RIO device struct is freed. */ static int rio_is_switch(struct rio_dev *rdev) { if (rdev->pef & RIO_PEF_SWITCH) return 1; return 0; } /** * rio_route_set_ops- Sets routing operations for a particular vendor switch * @rdev: RIO device * * Searches the RIO route ops table for known switch types. If the vid * and did match a switch table entry, then set the add_entry() and * get_entry() ops to the table entry values. */ static void rio_route_set_ops(struct rio_dev *rdev) { struct rio_route_ops *cur = __start_rio_route_ops; struct rio_route_ops *end = __end_rio_route_ops; while (cur < end) { if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) { pr_debug("RIO: adding routing ops for %s\n", rio_name(rdev)); rdev->rswitch->add_entry = cur->add_hook; rdev->rswitch->get_entry = cur->get_hook; } cur++; } if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry) printk(KERN_ERR "RIO: missing routing ops for %s\n", rio_name(rdev)); } /** * rio_add_device- Adds a RIO device to the device model * @rdev: RIO device * * Adds the RIO device to the global device list and adds the RIO * device to the RIO device list. Creates the generic sysfs nodes * for an RIO device. */ static void __devinit rio_add_device(struct rio_dev *rdev) { device_add(&rdev->dev); spin_lock(&rio_global_list_lock); list_add_tail(&rdev->global_list, &rio_devices); spin_unlock(&rio_global_list_lock); rio_create_sysfs_dev_files(rdev); } /** * rio_setup_device- Allocates and sets up a RIO device * @net: RIO network * @port: Master port to send transactions * @destid: Current destination ID * @hopcount: Current hopcount * @do_enum: Enumeration/Discovery mode flag * * Allocates a RIO device and configures fields based on configuration * space contents. If device has a destination ID register, a destination * ID is either assigned in enumeration mode or read from configuration * space in discovery mode. If the device has switch capabilities, then * a switch is allocated and configured appropriately. Returns a pointer * to a RIO device on success or NULL on failure. * */ static struct rio_dev *rio_setup_device(struct rio_net *net, struct rio_mport *port, u16 destid, u8 hopcount, int do_enum) { struct rio_dev *rdev; struct rio_switch *rswitch; int result, rdid; rdev = kzalloc(sizeof(struct rio_dev), GFP_KERNEL); if (!rdev) goto out; rdev->net = net; rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR, &result); rdev->did = result >> 16; rdev->vid = result & 0xffff; rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR, &rdev->device_rev); rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR, &result); rdev->asm_did = result >> 16; rdev->asm_vid = result & 0xffff; rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR, &result); rdev->asm_rev = result >> 16; rio_mport_read_config_32(port, destid, hopcount, RIO_PEF_CAR, &rdev->pef); if (rdev->pef & RIO_PEF_EXT_FEATURES) rdev->efptr = result & 0xffff; rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR, &rdev->src_ops); rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR, &rdev->dst_ops); if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) { if (do_enum) { rio_set_device_id(port, destid, hopcount, next_destid); rdev->destid = next_destid++; if (next_destid == port->host_deviceid) next_destid++; } else rdev->destid = rio_get_device_id(port, destid, hopcount); } else /* Switch device has an associated destID */ rdev->destid = RIO_INVALID_DESTID; /* If a PE has both switch and other functions, show it as a switch */ if (rio_is_switch(rdev)) { rio_mport_read_config_32(port, destid, hopcount, RIO_SWP_INFO_CAR, &rdev->swpinfo); rswitch = kmalloc(sizeof(struct rio_switch), GFP_KERNEL); if (!rswitch) { kfree(rdev); rdev = NULL; goto out; } rswitch->switchid = next_switchid; rswitch->hopcount = hopcount; rswitch->destid = destid; /* Initialize switch route table */ for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES; rdid++) rswitch->route_table[rdid] = RIO_INVALID_ROUTE; rdev->rswitch = rswitch; sprintf(rio_name(rdev), "%02x:s:%04x", rdev->net->id, rdev->rswitch->switchid); rio_route_set_ops(rdev); list_add_tail(&rswitch->node, &rio_switches); } else sprintf(rio_name(rdev), "%02x:e:%04x", rdev->net->id, rdev->destid); rdev->dev.bus = &rio_bus_type; device_initialize(&rdev->dev); rdev->dev.release = rio_release_dev; rio_dev_get(rdev); rdev->dma_mask = DMA_32BIT_MASK; rdev->dev.dma_mask = &rdev->dma_mask; rdev->dev.coherent_dma_mask = DMA_32BIT_MASK; if ((rdev->pef & RIO_PEF_INB_DOORBELL) && (rdev->dst_ops & RIO_DST_OPS_DOORBELL)) rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE], 0, 0xffff); rio_add_device(rdev); out: return rdev; } /** * rio_sport_is_active- Tests if a switch port has an active connection. * @port: Master port to send transaction * @destid: Associated destination ID for switch * @hopcount: Hopcount to reach switch * @sport: Switch port number * * Reads the port error status CSR for a particular switch port to * determine if the port has an active link. Returns * %PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is * inactive. */ static int rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport) { u32 result; u32 ext_ftr_ptr; int *entry = rio_sport_phys_table; do { if ((ext_ftr_ptr = rio_mport_get_feature(port, 0, destid, hopcount, *entry))) break; } while (*++entry >= 0); if (ext_ftr_ptr) rio_mport_read_config_32(port, destid, hopcount, ext_ftr_ptr + RIO_PORT_N_ERR_STS_CSR(sport), &result); return (result & PORT_N_ERR_STS_PORT_OK); } /** * rio_route_add_entry- Add a route entry to a switch routing table * @mport: Master port to send transaction * @rswitch: Switch device * @table: Routing table ID * @route_destid: Destination ID to be routed * @route_port: Port number to be routed * * Calls the switch specific add_entry() method to add a route entry * on a switch. The route table can be specified using the @table * argument if a switch has per port routing tables or the normal * use is to specific all tables (or the global table) by passing * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL * on failure. */ static int rio_route_add_entry(struct rio_mport *mport, struct rio_switch *rswitch, u16 table, u16 route_destid, u8 route_port) { return rswitch->add_entry(mport, rswitch->destid, rswitch->hopcount, table, route_destid, route_port); } /** * rio_route_get_entry- Read a route entry in a switch routing table * @mport: Master port to send transaction * @rswitch: Switch device * @table: Routing table ID * @route_destid: Destination ID to be routed * @route_port: Pointer to read port number into * * Calls the switch specific get_entry() method to read a route entry * in a switch. The route table can be specified using the @table * argument if a switch has per port routing tables or the normal * use is to specific all tables (or the global table) by passing * %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL * on failure. */ static int rio_route_get_entry(struct rio_mport *mport, struct rio_switch *rswitch, u16 table, u16 route_destid, u8 * route_port) { return rswitch->get_entry(mport, rswitch->destid, rswitch->hopcount, table, route_destid, route_port); } /** * rio_get_host_deviceid_lock- Reads the Host Device ID Lock CSR on a device * @port: Master port to send transaction * @hopcount: Number of hops to the device * * Used during enumeration to read the Host Device ID Lock CSR on a * RIO device. Returns the value of the lock register. */ static u16 rio_get_host_deviceid_lock(struct rio_mport *port, u8 hopcount) { u32 result; rio_mport_read_config_32(port, RIO_ANY_DESTID, hopcount, RIO_HOST_DID_LOCK_CSR, &result); return (u16) (result & 0xffff); } /** * rio_get_swpinfo_inport- Gets the ingress port number * @mport: Master port to send transaction * @destid: Destination ID associated with the switch * @hopcount: Number of hops to the device * * Returns port number being used to access the switch device. */ static u8 rio_get_swpinfo_inport(struct rio_mport *mport, u16 destid, u8 hopcount) { u32 result; rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR, &result); return (u8) (result & 0xff); } /** * rio_get_swpinfo_tports- Gets total number of ports on the switch * @mport: Master port to send transaction * @destid: Destination ID associated with the switch * @hopcount: Number of hops to the device * * Returns total numbers of ports implemented by the switch device. */ static u8 rio_get_swpinfo_tports(struct rio_mport *mport, u16 destid, u8 hopcount) { u32 result; rio_mport_read_config_32(mport, destid, hopcount, RIO_SWP_INFO_CAR, &result); return RIO_GET_TOTAL_PORTS(result); } /** * rio_net_add_mport- Add a master port to a RIO network * @net: RIO network * @port: Master port to add * * Adds a master port to the network list of associated master * ports.. */ static void rio_net_add_mport(struct rio_net *net, struct rio_mport *port) { spin_lock(&rio_global_list_lock); list_add_tail(&port->nnode, &net->mports); spin_unlock(&rio_global_list_lock); } /** * rio_enum_peer- Recursively enumerate a RIO network through a master port * @net: RIO network being enumerated * @port: Master port to send transactions * @hopcount: Number of hops into the network * * Recursively enumerates a RIO network. Transactions are sent via the * master port passed in @port. */ static int rio_enum_peer(struct rio_net *net, struct rio_mport *port, u8 hopcount) { int port_num; int num_ports; int cur_destid; int sw_destid; int sw_inport; struct rio_dev *rdev; u16 destid; int tmp; if (rio_get_host_deviceid_lock(port, hopcount) == port->host_deviceid) { pr_debug("RIO: PE already discovered by this host\n"); /* * Already discovered by this host. Add it as another * master port for the current network. */ rio_net_add_mport(net, port); return 0; } /* Attempt to acquire device lock */ rio_mport_write_config_32(port, RIO_ANY_DESTID, hopcount, RIO_HOST_DID_LOCK_CSR, port->host_deviceid); while ((tmp = rio_get_host_deviceid_lock(port, hopcount)) < port->host_deviceid) { /* Delay a bit */ mdelay(1); /* Attempt to acquire device lock again */ rio_mport_write_config_32(port, RIO_ANY_DESTID, hopcount, RIO_HOST_DID_LOCK_CSR, port->host_deviceid); } if (rio_get_host_deviceid_lock(port, hopcount) > port->host_deviceid) { pr_debug( "RIO: PE locked by a higher priority host...retreating\n"); return -1; } /* Setup new RIO device */ if ((rdev = rio_setup_device(net, port, RIO_ANY_DESTID, hopcount, 1))) { /* Add device to the global and bus/net specific list. */ list_add_tail(&rdev->net_list, &net->devices); } else return -1; if (rio_is_switch(rdev)) { next_switchid++; sw_inport = rio_get_swpinfo_inport(port, RIO_ANY_DESTID, hopcount); rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE, port->host_deviceid, sw_inport); rdev->rswitch->route_table[port->host_deviceid] = sw_inport; for (destid = 0; destid < next_destid; destid++) { if (destid == port->host_deviceid) continue; rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE, destid, sw_inport); rdev->rswitch->route_table[destid] = sw_inport; } num_ports = rio_get_swpinfo_tports(port, RIO_ANY_DESTID, hopcount); pr_debug( "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", rio_name(rdev), rdev->vid, rdev->did, num_ports); sw_destid = next_destid; for (port_num = 0; port_num < num_ports; port_num++) { if (sw_inport == port_num) continue; cur_destid = next_destid; if (rio_sport_is_active (port, RIO_ANY_DESTID, hopcount, port_num)) { pr_debug( "RIO: scanning device on port %d\n", port_num); rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE, RIO_ANY_DESTID, port_num); if (rio_enum_peer(net, port, hopcount + 1) < 0) return -1; /* Update routing tables */ if (next_destid > cur_destid) { for (destid = cur_destid; destid < next_destid; destid++) { if (destid == port->host_deviceid) continue; rio_route_add_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE, destid, port_num); rdev->rswitch-> route_table[destid] = port_num; } } } } /* Check for empty switch */ if (next_destid == sw_destid) { next_destid++; if (next_destid == port->host_deviceid) next_destid++; } rdev->rswitch->destid = sw_destid; } else pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", rio_name(rdev), rdev->vid, rdev->did); return 0; } /** * rio_enum_complete- Tests if enumeration of a network is complete * @port: Master port to send transaction * * Tests the Component Tag CSR for presence of the magic enumeration * complete flag. Return %1 if enumeration is complete or %0 if * enumeration is incomplete. */ static int rio_enum_complete(struct rio_mport *port) { u32 tag_csr; int ret = 0; rio_local_read_config_32(port, RIO_COMPONENT_TAG_CSR, &tag_csr); if (tag_csr == RIO_ENUM_CMPL_MAGIC) ret = 1; return ret; } /** * rio_disc_peer- Recursively discovers a RIO network through a master port * @net: RIO network being discovered * @port: Master port to send transactions * @destid: Current destination ID in network * @hopcount: Number of hops into the network * * Recursively discovers a RIO network. Transactions are sent via the * master port passed in @port. */ static int rio_disc_peer(struct rio_net *net, struct rio_mport *port, u16 destid, u8 hopcount) { u8 port_num, route_port; int num_ports; struct rio_dev *rdev; u16 ndestid; /* Setup new RIO device */ if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) { /* Add device to the global and bus/net specific list. */ list_add_tail(&rdev->net_list, &net->devices); } else return -1; if (rio_is_switch(rdev)) { next_switchid++; /* Associated destid is how we accessed this switch */ rdev->rswitch->destid = destid; num_ports = rio_get_swpinfo_tports(port, destid, hopcount); pr_debug( "RIO: found %s (vid %4.4x did %4.4x) with %d ports\n", rio_name(rdev), rdev->vid, rdev->did, num_ports); for (port_num = 0; port_num < num_ports; port_num++) { if (rio_get_swpinfo_inport(port, destid, hopcount) == port_num) continue; if (rio_sport_is_active (port, destid, hopcount, port_num)) { pr_debug( "RIO: scanning device on port %d\n", port_num); for (ndestid = 0; ndestid < RIO_ANY_DESTID; ndestid++) { rio_route_get_entry(port, rdev->rswitch, RIO_GLOBAL_TABLE, ndestid, &route_port); if (route_port == port_num) break; } if (rio_disc_peer (net, port, ndestid, hopcount + 1) < 0) return -1; } } } else pr_debug("RIO: found %s (vid %4.4x did %4.4x)\n", rio_name(rdev), rdev->vid, rdev->did); return 0; } /** * rio_mport_is_active- Tests if master port link is active * @port: Master port to test * * Reads the port error status CSR for the master port to * determine if the port has an active link. Returns * %PORT_N_ERR_STS_PORT_OK if the master port is active * or %0 if it is inactive. */ static int rio_mport_is_active(struct rio_mport *port) { u32 result = 0; u32 ext_ftr_ptr; int *entry = rio_mport_phys_table; do { if ((ext_ftr_ptr = rio_mport_get_feature(port, 1, 0, 0, *entry))) break; } while (*++entry >= 0); if (ext_ftr_ptr) rio_local_read_config_32(port, ext_ftr_ptr + RIO_PORT_N_ERR_STS_CSR(port->index), &result); return (result & PORT_N_ERR_STS_PORT_OK); } /** * rio_alloc_net- Allocate and configure a new RIO network * @port: Master port associated with the RIO network * * Allocates a RIO network structure, initializes per-network * list heads, and adds the associated master port to the * network list of associated master ports. Returns a * RIO network pointer on success or %NULL on failure. */ static struct rio_net __devinit *rio_alloc_net(struct rio_mport *port) { struct rio_net *net; net = kzalloc(sizeof(struct rio_net), GFP_KERNEL); if (net) { INIT_LIST_HEAD(&net->node); INIT_LIST_HEAD(&net->devices); INIT_LIST_HEAD(&net->mports); list_add_tail(&port->nnode, &net->mports); net->hport = port; net->id = next_net++; } return net; } /** * rio_update_route_tables- Updates route tables in switches * @port: Master port associated with the RIO network * * For each enumerated device, ensure that each switch in a system * has correct routing entries. Add routes for devices that where * unknown dirung the first enumeration pass through the switch. */ static void rio_update_route_tables(struct rio_mport *port) { struct rio_dev *rdev; struct rio_switch *rswitch; u8 sport; u16 destid; list_for_each_entry(rdev, &rio_devices, global_list) { destid = (rio_is_switch(rdev))?rdev->rswitch->destid:rdev->destid; list_for_each_entry(rswitch, &rio_switches, node) { if (rio_is_switch(rdev) && (rdev->rswitch == rswitch)) continue; if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) { sport = rio_get_swpinfo_inport(port, rswitch->destid, rswitch->hopcount); if (rswitch->add_entry) { rio_route_add_entry(port, rswitch, RIO_GLOBAL_TABLE, destid, sport); rswitch->route_table[destid] = sport; } } } } } /** * rio_enum_mport- Start enumeration through a master port * @mport: Master port to send transactions * * Starts the enumeration process. If somebody has enumerated our * master port device, then give up. If not and we have an active * link, then start recursive peer enumeration. Returns %0 if * enumeration succeeds or %-EBUSY if enumeration fails. */ int rio_enum_mport(struct rio_mport *mport) { struct rio_net *net = NULL; int rc = 0; printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id, mport->name); /* If somebody else enumerated our master port device, bail. */ if (rio_enum_host(mport) < 0) { printk(KERN_INFO "RIO: master port %d device has been enumerated by a remote host\n", mport->id); rc = -EBUSY; goto out; } /* If master port has an active link, allocate net and enum peers */ if (rio_mport_is_active(mport)) { if (!(net = rio_alloc_net(mport))) { printk(KERN_ERR "RIO: failed to allocate new net\n"); rc = -ENOMEM; goto out; } if (rio_enum_peer(net, mport, 0) < 0) { /* A higher priority host won enumeration, bail. */ printk(KERN_INFO "RIO: master port %d device has lost enumeration to a remote host\n", mport->id); rio_clear_locks(mport); rc = -EBUSY; goto out; } rio_update_route_tables(mport); rio_clear_locks(mport); } else { printk(KERN_INFO "RIO: master port %d link inactive\n", mport->id); rc = -EINVAL; } out: return rc; } /** * rio_build_route_tables- Generate route tables from switch route entries * * For each switch device, generate a route table by copying existing * route entries from the switch. */ static void rio_build_route_tables(void) { struct rio_dev *rdev; int i; u8 sport; list_for_each_entry(rdev, &rio_devices, global_list) if (rio_is_switch(rdev)) for (i = 0; i < RIO_MAX_ROUTE_ENTRIES; i++) { if (rio_route_get_entry (rdev->net->hport, rdev->rswitch, RIO_GLOBAL_TABLE, i, &sport) < 0) continue; rdev->rswitch->route_table[i] = sport; } } /** * rio_enum_timeout- Signal that enumeration timed out * @data: Address of timeout flag. * * When the enumeration complete timer expires, set a flag that * signals to the discovery process that enumeration did not * complete in a sane amount of time. */ static void rio_enum_timeout(unsigned long data) { /* Enumeration timed out, set flag */ *(int *)data = 1; } /** * rio_disc_mport- Start discovery through a master port * @mport: Master port to send transactions * * Starts the discovery process. If we have an active link, * then wait for the signal that enumeration is complete. * When enumeration completion is signaled, start recursive * peer discovery. Returns %0 if discovery succeeds or %-EBUSY * on failure. */ int rio_disc_mport(struct rio_mport *mport) { struct rio_net *net = NULL; int enum_timeout_flag = 0; printk(KERN_INFO "RIO: discover master port %d, %s\n", mport->id, mport->name); /* If master port has an active link, allocate net and discover peers */ if (rio_mport_is_active(mport)) { if (!(net = rio_alloc_net(mport))) { printk(KERN_ERR "RIO: Failed to allocate new net\n"); goto bail; } pr_debug("RIO: wait for enumeration complete..."); rio_enum_timer.expires = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ; rio_enum_timer.data = (unsigned long)&enum_timeout_flag; add_timer(&rio_enum_timer); while (!rio_enum_complete(mport)) { mdelay(1); if (enum_timeout_flag) { del_timer_sync(&rio_enum_timer); goto timeout; } } del_timer_sync(&rio_enum_timer); pr_debug("done\n"); if (rio_disc_peer(net, mport, RIO_ANY_DESTID, 0) < 0) { printk(KERN_INFO "RIO: master port %d device has failed discovery\n", mport->id); goto bail; } rio_build_route_tables(); } return 0; timeout: pr_debug("timeout\n"); bail: return -EBUSY; }