diff options
Diffstat (limited to 'drivers/rapidio/rio-scan.c')
| -rw-r--r-- | drivers/rapidio/rio-scan.c | 960 |
1 files changed, 960 insertions, 0 deletions
diff --git a/drivers/rapidio/rio-scan.c b/drivers/rapidio/rio-scan.c new file mode 100644 index 00000000000..20e1d8f7459 --- /dev/null +++ b/drivers/rapidio/rio-scan.c @@ -0,0 +1,960 @@ +/* + * 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/config.h> +#include <linux/types.h> +#include <linux/kernel.h> + +#include <linux/delay.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 "rio.h" + +LIST_HEAD(rio_devices); +static LIST_HEAD(rio_switches); + +#define RIO_ENUM_CMPL_MAGIC 0xdeadbeef + +static void rio_enum_timeout(unsigned long); + +spinlock_t rio_global_list_lock = SPIN_LOCK_UNLOCKED; +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, +}; + +extern struct rio_route_ops __start_rio_route_ops[]; +extern struct rio_route_ops __end_rio_route_ops[]; + +/** + * 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) +{ + if (((src_ops & RIO_SRC_OPS_READ) || + (src_ops & RIO_SRC_OPS_WRITE) || + (src_ops & RIO_SRC_OPS_ATOMIC_TST_SWP) || + (src_ops & RIO_SRC_OPS_ATOMIC_INC) || + (src_ops & RIO_SRC_OPS_ATOMIC_DEC) || + (src_ops & RIO_SRC_OPS_ATOMIC_SET) || + (src_ops & RIO_SRC_OPS_ATOMIC_CLR)) && + ((dst_ops & RIO_DST_OPS_READ) || + (dst_ops & RIO_DST_OPS_WRITE) || + (dst_ops & RIO_DST_OPS_ATOMIC_TST_SWP) || + (dst_ops & RIO_DST_OPS_ATOMIC_INC) || + (dst_ops & RIO_DST_OPS_ATOMIC_DEC) || + (dst_ops & RIO_DST_OPS_ATOMIC_SET) || + (dst_ops & RIO_DST_OPS_ATOMIC_CLR))) { + return 1; + } else + return 0; +} + +/** + * 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 = kmalloc(sizeof(struct rio_dev), GFP_KERNEL); + if (!rdev) + goto out; + + memset(rdev, 0, sizeof(struct rio_dev)); + 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) + && 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); + + /* 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 = 0xffff; + /* 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->dev.dma_mask = (u64 *) 0xffffffff; + rdev->dev.coherent_dma_mask = 0xffffffffULL; + + 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 + * @rdev: 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_dev *rdev, + u16 table, u16 route_destid, u8 route_port) +{ + return rdev->rswitch->add_entry(mport, rdev->rswitch->destid, + rdev->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 + * @rdev: 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_dev *rdev, u16 table, + u16 route_destid, u8 * route_port) +{ + return rdev->rswitch->get_entry(mport, rdev->rswitch->destid, + rdev->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; + 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++; + + for (destid = 0; destid < next_destid; destid++) { + rio_route_add_entry(port, rdev, RIO_GLOBAL_TABLE, + destid, rio_get_swpinfo_inport(port, + RIO_ANY_DESTID, + hopcount)); + rdev->rswitch->route_table[destid] = + rio_get_swpinfo_inport(port, RIO_ANY_DESTID, + hopcount); + } + + 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); + for (port_num = 0; port_num < num_ports; port_num++) { + if (rio_get_swpinfo_inport + (port, RIO_ANY_DESTID, hopcount) == 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, + 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++) { + rio_route_add_entry(port, rdev, + RIO_GLOBAL_TABLE, + destid, + port_num); + rdev->rswitch-> + route_table[destid] = + port_num; + } + rdev->rswitch->destid = cur_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, + 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 = kmalloc(sizeof(struct rio_net), GFP_KERNEL); + if (net) { + memset(net, 0, sizeof(struct rio_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_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_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, 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; +} |