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rio-scan.c
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/*
* RapidIO enumeration and discovery support
*
* Copyright 2005 MontaVista Software, Inc.
* Matt Porter <mporter@kernel.crashing.org>
*
* Copyright 2009 Integrated Device Technology, Inc.
* Alex Bounine <alexandre.bounine@idt.com>
* - Added Port-Write/Error Management initialization and handling
*
* Copyright 2009 Sysgo AG
* Thomas Moll <thomas.moll@sysgo.com>
* - Added Input- Output- enable functionality, to allow full communication
*
* 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/sched.h>
#include <linux/jiffies.h>
#include <linux/slab.h>
#include "rio.h"
LIST_HEAD(rio_devices);
static void rio_init_em(struct rio_dev *rdev);
DEFINE_SPINLOCK(rio_global_list_lock);
static int next_destid = 0;
static int next_comptag = 1;
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,
};
/*
* rio_destid_alloc - Allocate next available destID for given network
* net: RIO network
*
* Returns next available device destination ID for the specified RIO network.
* Marks allocated ID as one in use.
* Returns RIO_INVALID_DESTID if new destID is not available.
*/
static u16 rio_destid_alloc(struct rio_net *net)
{
int destid;
struct rio_id_table *idtab = &net->destid_table;
spin_lock(&idtab->lock);
destid = find_next_zero_bit(idtab->table, idtab->max, idtab->next);
if (destid >= idtab->max)
destid = find_first_zero_bit(idtab->table, idtab->max);
if (destid < idtab->max) {
idtab->next = destid + 1;
if (idtab->next >= idtab->max)
idtab->next = 0;
set_bit(destid, idtab->table);
destid += idtab->start;
} else
destid = RIO_INVALID_DESTID;
spin_unlock(&idtab->lock);
return (u16)destid;
}
/*
* rio_destid_reserve - Reserve the specivied destID
* net: RIO network
* destid: destID to reserve
*
* Tries to reserve the specified destID.
* Returns 0 if successfull.
*/
static int rio_destid_reserve(struct rio_net *net, u16 destid)
{
int oldbit;
struct rio_id_table *idtab = &net->destid_table;
destid -= idtab->start;
spin_lock(&idtab->lock);
oldbit = test_and_set_bit(destid, idtab->table);
spin_unlock(&idtab->lock);
return oldbit;
}
/*
* rio_destid_free - free a previously allocated destID
* net: RIO network
* destid: destID to free
*
* Makes the specified destID available for use.
*/
static void rio_destid_free(struct rio_net *net, u16 destid)
{
struct rio_id_table *idtab = &net->destid_table;
destid -= idtab->start;
spin_lock(&idtab->lock);
clear_bit(destid, idtab->table);
spin_unlock(&idtab->lock);
}
/*
* rio_destid_first - return first destID in use
* net: RIO network
*/
static u16 rio_destid_first(struct rio_net *net)
{
int destid;
struct rio_id_table *idtab = &net->destid_table;
spin_lock(&idtab->lock);
destid = find_first_bit(idtab->table, idtab->max);
if (destid >= idtab->max)
destid = RIO_INVALID_DESTID;
else
destid += idtab->start;
spin_unlock(&idtab->lock);
return (u16)destid;
}
/*
* rio_destid_next - return next destID in use
* net: RIO network
* from: destination ID from which search shall continue
*/
static u16 rio_destid_next(struct rio_net *net, u16 from)
{
int destid;
struct rio_id_table *idtab = &net->destid_table;
spin_lock(&idtab->lock);
destid = find_next_bit(idtab->table, idtab->max, from);
if (destid >= idtab->max)
destid = RIO_INVALID_DESTID;
else
destid += idtab->start;
spin_unlock(&idtab->lock);
return (u16)destid;
}
/**
* 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(port->sys_size, 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(port->sys_size, 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(port->sys_size,
did));
}
/**
* rio_clear_locks- Release all host locks and signal enumeration complete
* @net: RIO network to run on
*
* 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_net *net)
{
struct rio_mport *port = net->hport;
struct rio_dev *rdev;
u32 result;
int ret = 0;
/* 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, &net->devices, net_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;
}
/* Mark device as discovered and enable master */
rio_read_config_32(rdev,
rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
&result);
result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
rio_write_config_32(rdev,
rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
result);
}
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);
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_switch_init - Sets switch operations for a particular vendor switch
* @rdev: RIO device
* @do_enum: Enumeration/Discovery mode flag
*
* Searches the RIO switch ops table for known switch types. If the vid
* and did match a switch table entry, then call switch initialization
* routine to setup switch-specific routines.
*/
static void rio_switch_init(struct rio_dev *rdev, int do_enum)
{
struct rio_switch_ops *cur = __start_rio_switch_ops;
struct rio_switch_ops *end = __end_rio_switch_ops;
while (cur < end) {
if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
pr_debug("RIO: calling init routine for %s\n",
rio_name(rdev));
cur->init_hook(rdev, do_enum);
break;
}
cur++;
}
if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) {
pr_debug("RIO: adding STD routing ops for %s\n",
rio_name(rdev));
rdev->rswitch->add_entry = rio_std_route_add_entry;
rdev->rswitch->get_entry = rio_std_route_get_entry;
rdev->rswitch->clr_table = rio_std_route_clr_table;
}
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 int __devinit rio_add_device(struct rio_dev *rdev)
{
int err;
err = device_add(&rdev->dev);
if (err)
return err;
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);
return 0;
}
/**
* rio_enable_rx_tx_port - enable input receiver and output transmitter of
* given port
* @port: Master port associated with the RIO network
* @local: local=1 select local port otherwise a far device is reached
* @destid: Destination ID of the device to check host bit
* @hopcount: Number of hops to reach the target
* @port_num: Port (-number on switch) to enable on a far end device
*
* Returns 0 or 1 from on General Control Command and Status Register
* (EXT_PTR+0x3C)
*/
inline int rio_enable_rx_tx_port(struct rio_mport *port,
int local, u16 destid,
u8 hopcount, u8 port_num) {
#ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
u32 regval;
u32 ext_ftr_ptr;
/*
* enable rx input tx output port
*/
pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
"%d, port_num = %d)\n", local, destid, hopcount, port_num);
ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
if (local) {
rio_local_read_config_32(port, ext_ftr_ptr +
RIO_PORT_N_CTL_CSR(0),
®val);
} else {
if (rio_mport_read_config_32(port, destid, hopcount,
ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), ®val) < 0)
return -EIO;
}
if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
/* serial */
regval = regval | RIO_PORT_N_CTL_EN_RX_SER
| RIO_PORT_N_CTL_EN_TX_SER;
} else {
/* parallel */
regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
| RIO_PORT_N_CTL_EN_TX_PAR;
}
if (local) {
rio_local_write_config_32(port, ext_ftr_ptr +
RIO_PORT_N_CTL_CSR(0), regval);
} else {
if (rio_mport_write_config_32(port, destid, hopcount,
ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
return -EIO;
}
#endif
return 0;
}
/**
* 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 __devinit *rio_setup_device(struct rio_net *net,
struct rio_mport *port, u16 destid,
u8 hopcount, int do_enum)
{
int ret = 0;
struct rio_dev *rdev;
struct rio_switch *rswitch = NULL;
int result, rdid;
size_t size;
u32 swpinfo = 0;
size = sizeof(struct rio_dev);
if (rio_mport_read_config_32(port, destid, hopcount,
RIO_PEF_CAR, &result))
return NULL;
if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
rio_mport_read_config_32(port, destid, hopcount,
RIO_SWP_INFO_CAR, &swpinfo);
if (result & RIO_PEF_SWITCH) {
size += (RIO_GET_TOTAL_PORTS(swpinfo) *
sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
}
}
rdev = kzalloc(size, GFP_KERNEL);
if (!rdev)
return NULL;
rdev->net = net;
rdev->pef = result;
rdev->swpinfo = swpinfo;
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;
if (rdev->pef & RIO_PEF_EXT_FEATURES) {
rdev->efptr = result & 0xffff;
rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
hopcount);
rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
hopcount, RIO_EFB_ERR_MGMNT);
}
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 (do_enum) {
/* Assign component tag to device */
if (next_comptag >= 0x10000) {
pr_err("RIO: Component Tag Counter Overflow\n");
goto cleanup;
}
rio_mport_write_config_32(port, destid, hopcount,
RIO_COMPONENT_TAG_CSR, next_comptag);
rdev->comp_tag = next_comptag++;
} else {
rio_mport_read_config_32(port, destid, hopcount,
RIO_COMPONENT_TAG_CSR,
&rdev->comp_tag);
}
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;
next_destid = rio_destid_alloc(net);
} else
rdev->destid = rio_get_device_id(port, destid, hopcount);
rdev->hopcount = 0xff;
} else {
/* Switch device has an associated destID which
* will be adjusted later
*/
rdev->destid = destid;
rdev->hopcount = hopcount;
}
/* If a PE has both switch and other functions, show it as a switch */
if (rio_is_switch(rdev)) {
rswitch = rdev->rswitch;
rswitch->switchid = rdev->comp_tag & RIO_CTAG_UDEVID;
rswitch->port_ok = 0;
rswitch->route_table = kzalloc(sizeof(u8)*
RIO_MAX_ROUTE_ENTRIES(port->sys_size),
GFP_KERNEL);
if (!rswitch->route_table)
goto cleanup;
/* Initialize switch route table */
for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
rdid++)
rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
rswitch->switchid);
rio_switch_init(rdev, do_enum);
if (do_enum && rswitch->clr_table)
rswitch->clr_table(port, destid, hopcount,
RIO_GLOBAL_TABLE);
list_add_tail(&rswitch->node, &net->switches);
} else {
if (do_enum)
/*Enable Input Output Port (transmitter reviever)*/
rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
rdev->destid);
}
rdev->dev.bus = &rio_bus_type;
rdev->dev.parent = &rio_bus;
device_initialize(&rdev->dev);
rdev->dev.release = rio_release_dev;
rio_dev_get(rdev);
rdev->dma_mask = DMA_BIT_MASK(32);
rdev->dev.dma_mask = &rdev->dma_mask;
rdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
0, 0xffff);
ret = rio_add_device(rdev);
if (ret)
goto cleanup;
return rdev;
cleanup:
if (rswitch)
kfree(rswitch->route_table);
kfree(rdev);
return NULL;
}
/**
* 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
* %RIO_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 = 0;
u32 ext_ftr_ptr;
ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount, 0);
while (ext_ftr_ptr) {
rio_mport_read_config_32(port, destid, hopcount,
ext_ftr_ptr, &result);
result = RIO_GET_BLOCK_ID(result);
if ((result == RIO_EFB_SER_EP_FREE_ID) ||
(result == RIO_EFB_SER_EP_FREE_ID_V13P) ||
(result == RIO_EFB_SER_EP_FREC_ID))
break;
ext_ftr_ptr = rio_mport_get_efb(port, 0, destid, hopcount,
ext_ftr_ptr);
}
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 & RIO_PORT_N_ERR_STS_PORT_OK;
}
/**
* rio_lock_device - Acquires host device lock for specified device
* @port: Master port to send transaction
* @destid: Destination ID for device/switch
* @hopcount: Hopcount to reach switch
* @wait_ms: Max wait time in msec (0 = no timeout)
*
* Attepts to acquire host device lock for specified device
* Returns 0 if device lock acquired or EINVAL if timeout expires.
*/
static int
rio_lock_device(struct rio_mport *port, u16 destid, u8 hopcount, int wait_ms)
{
u32 result;
int tcnt = 0;
/* Attempt to acquire device lock */
rio_mport_write_config_32(port, destid, hopcount,
RIO_HOST_DID_LOCK_CSR, port->host_deviceid);
rio_mport_read_config_32(port, destid, hopcount,
RIO_HOST_DID_LOCK_CSR, &result);
while (result != port->host_deviceid) {
if (wait_ms != 0 && tcnt == wait_ms) {
pr_debug("RIO: timeout when locking device %x:%x\n",
destid, hopcount);
return -EINVAL;
}
/* Delay a bit */
mdelay(1);
tcnt++;
/* Try to acquire device lock again */
rio_mport_write_config_32(port, destid,
hopcount,
RIO_HOST_DID_LOCK_CSR,
port->host_deviceid);
rio_mport_read_config_32(port, destid,
hopcount,
RIO_HOST_DID_LOCK_CSR, &result);
}
return 0;
}
/**
* rio_unlock_device - Releases host device lock for specified device
* @port: Master port to send transaction
* @destid: Destination ID for device/switch
* @hopcount: Hopcount to reach switch
*
* Returns 0 if device lock released or EINVAL if fails.
*/
static int
rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)
{
u32 result;
/* Release device lock */
rio_mport_write_config_32(port, destid,
hopcount,
RIO_HOST_DID_LOCK_CSR,
port->host_deviceid);
rio_mport_read_config_32(port, destid, hopcount,
RIO_HOST_DID_LOCK_CSR, &result);
if ((result & 0xffff) != 0xffff) {
pr_debug("RIO: badness when releasing device lock %x:%x\n",
destid, hopcount);
return -EINVAL;
}
return 0;
}
/**
* rio_route_add_entry- Add a route entry to a switch routing table
* @rdev: RIO device
* @table: Routing table ID
* @route_destid: Destination ID to be routed
* @route_port: Port number to be routed
* @lock: lock switch device flag
*
* 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_dev *rdev,
u16 table, u16 route_destid, u8 route_port, int lock)
{
int rc;
if (lock) {
rc = rio_lock_device(rdev->net->hport, rdev->destid,
rdev->hopcount, 1000);
if (rc)
return rc;
}
rc = rdev->rswitch->add_entry(rdev->net->hport, rdev->destid,
rdev->hopcount, table,
route_destid, route_port);
if (lock)
rio_unlock_device(rdev->net->hport, rdev->destid,
rdev->hopcount);
return rc;
}
/**
* rio_route_get_entry- Read a route entry in a switch routing table
* @rdev: RIO device
* @table: Routing table ID
* @route_destid: Destination ID to be routed
* @route_port: Pointer to read port number into
* @lock: lock switch device flag
*
* 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_dev *rdev, u16 table,
u16 route_destid, u8 *route_port, int lock)
{
int rc;
if (lock) {
rc = rio_lock_device(rdev->net->hport, rdev->destid,
rdev->hopcount, 1000);
if (rc)
return rc;
}
rc = rdev->rswitch->get_entry(rdev->net->hport, rdev->destid,
rdev->hopcount, table,
route_destid, route_port);
if (lock)
rio_unlock_device(rdev->net->hport, rdev->destid,
rdev->hopcount);
return rc;
}
/**
* 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(port->sys_size), hopcount,
RIO_HOST_DID_LOCK_CSR, &result);
return (u16) (result & 0xffff);
}
/**
* 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
* @prev: Previous RIO device connected to the enumerated one
* @prev_port: Port on previous RIO device
*
* Recursively enumerates a RIO network. Transactions are sent via the
* master port passed in @port.
*/
static int __devinit rio_enum_peer(struct rio_net *net, struct rio_mport *port,
u8 hopcount, struct rio_dev *prev, int prev_port)
{
struct rio_dev *rdev;
u32 regval;
int tmp;
if (rio_mport_chk_dev_access(port,
RIO_ANY_DESTID(port->sys_size), hopcount)) {
pr_debug("RIO: device access check failed\n");
return -1;
}
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
* link to the existing device.
*/
rio_mport_read_config_32(port, RIO_ANY_DESTID(port->sys_size),
hopcount, RIO_COMPONENT_TAG_CSR, ®val);
if (regval) {
rdev = rio_get_comptag((regval & 0xffff), NULL);
if (rdev && prev && rio_is_switch(prev)) {
pr_debug("RIO: redundant path to %s\n",
rio_name(rdev));
prev->rswitch->nextdev[prev_port] = rdev;
}
}
return 0;
}
/* Attempt to acquire device lock */
rio_mport_write_config_32(port, RIO_ANY_DESTID(port->sys_size),
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(port->sys_size),
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 */
rdev = rio_setup_device(net, port, RIO_ANY_DESTID(port->sys_size),
hopcount, 1);
if (rdev) {
/* Add device to the global and bus/net specific list. */
list_add_tail(&rdev->net_list, &net->devices);
rdev->prev = prev;
if (prev && rio_is_switch(prev))
prev->rswitch->nextdev[prev_port] = rdev;
} else
return -1;
if (rio_is_switch(rdev)) {
int sw_destid;
int cur_destid;
int sw_inport;
u16 destid;
int port_num;
sw_inport = RIO_GET_PORT_NUM(rdev->swpinfo);
rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
port->host_deviceid, sw_inport, 0);
rdev->rswitch->route_table[port->host_deviceid] = sw_inport;
destid = rio_destid_first(net);
while (destid != RIO_INVALID_DESTID && destid < next_destid) {
if (destid != port->host_deviceid) {
rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
destid, sw_inport, 0);
rdev->rswitch->route_table[destid] = sw_inport;
}
destid = rio_destid_next(net, destid + 1);
}
pr_debug(
"RIO: found %s (vid %4.4x did %4.4x) with %d ports\n",
rio_name(rdev), rdev->vid, rdev->did,
RIO_GET_TOTAL_PORTS(rdev->swpinfo));
sw_destid = next_destid;
for (port_num = 0;
port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
port_num++) {
if (sw_inport == port_num) {
rio_enable_rx_tx_port(port, 0,
RIO_ANY_DESTID(port->sys_size),
hopcount, port_num);
rdev->rswitch->port_ok |= (1 << port_num);
continue;
}
cur_destid = next_destid;
if (rio_sport_is_active
(port, RIO_ANY_DESTID(port->sys_size), hopcount,
port_num)) {
pr_debug(
"RIO: scanning device on port %d\n",
port_num);
rio_enable_rx_tx_port(port, 0,
RIO_ANY_DESTID(port->sys_size),
hopcount, port_num);
rdev->rswitch->port_ok |= (1 << port_num);
rio_route_add_entry(rdev, RIO_GLOBAL_TABLE,
RIO_ANY_DESTID(port->sys_size),
port_num, 0);
if (rio_enum_peer(net, port, hopcount + 1,
rdev, port_num) < 0)
return -1;
/* Update routing tables */
destid = rio_destid_next(net, cur_destid + 1);
if (destid != RIO_INVALID_DESTID) {
for (destid = cur_destid;
destid < next_destid;) {
if (destid != port->host_deviceid) {
rio_route_add_entry(rdev,
RIO_GLOBAL_TABLE,
destid,
port_num,
0);
rdev->rswitch->
route_table[destid] =
port_num;
}
destid = rio_destid_next(net,
destid + 1);
}
}
} else {
/* If switch supports Error Management,
* set PORT_LOCKOUT bit for unused port
*/
if (rdev->em_efptr)
rio_set_port_lockout(rdev, port_num, 1);
rdev->rswitch->port_ok &= ~(1 << port_num);
}
}
/* Direct Port-write messages to the enumeratiing host */