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1023 lines
28 KiB
1023 lines
28 KiB
/*
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* RapidIO enumeration and discovery support
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*
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* Copyright 2005 MontaVista Software, Inc.
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* Matt Porter <mporter@kernel.crashing.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/dma-mapping.h>
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#include <linux/init.h>
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#include <linux/rio.h>
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#include <linux/rio_drv.h>
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#include <linux/rio_ids.h>
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#include <linux/rio_regs.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/timer.h>
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#include <linux/jiffies.h>
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#include <linux/slab.h>
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#include "rio.h"
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LIST_HEAD(rio_devices);
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static LIST_HEAD(rio_switches);
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#define RIO_ENUM_CMPL_MAGIC 0xdeadbeef
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static void rio_enum_timeout(unsigned long);
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DEFINE_SPINLOCK(rio_global_list_lock);
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static int next_destid = 0;
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static int next_switchid = 0;
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static int next_net = 0;
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static struct timer_list rio_enum_timer =
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TIMER_INITIALIZER(rio_enum_timeout, 0, 0);
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static int rio_mport_phys_table[] = {
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RIO_EFB_PAR_EP_ID,
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RIO_EFB_PAR_EP_REC_ID,
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RIO_EFB_SER_EP_ID,
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RIO_EFB_SER_EP_REC_ID,
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-1,
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};
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static int rio_sport_phys_table[] = {
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RIO_EFB_PAR_EP_FREE_ID,
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RIO_EFB_SER_EP_FREE_ID,
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-1,
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};
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/**
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* rio_get_device_id - Get the base/extended device id for a device
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* @port: RIO master port
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* @destid: Destination ID of device
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* @hopcount: Hopcount to device
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*
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* Reads the base/extended device id from a device. Returns the
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* 8/16-bit device ID.
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*/
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static u16 rio_get_device_id(struct rio_mport *port, u16 destid, u8 hopcount)
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{
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u32 result;
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rio_mport_read_config_32(port, destid, hopcount, RIO_DID_CSR, &result);
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return RIO_GET_DID(port->sys_size, result);
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}
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/**
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* rio_set_device_id - Set the base/extended device id for a device
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* @port: RIO master port
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* @destid: Destination ID of device
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* @hopcount: Hopcount to device
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* @did: Device ID value to be written
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*
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* Writes the base/extended device id from a device.
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*/
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static void rio_set_device_id(struct rio_mport *port, u16 destid, u8 hopcount, u16 did)
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{
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rio_mport_write_config_32(port, destid, hopcount, RIO_DID_CSR,
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RIO_SET_DID(port->sys_size, did));
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}
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/**
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* rio_local_set_device_id - Set the base/extended device id for a port
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* @port: RIO master port
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* @did: Device ID value to be written
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*
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* Writes the base/extended device id from a device.
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*/
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static void rio_local_set_device_id(struct rio_mport *port, u16 did)
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{
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rio_local_write_config_32(port, RIO_DID_CSR, RIO_SET_DID(port->sys_size,
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did));
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}
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/**
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* rio_clear_locks- Release all host locks and signal enumeration complete
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* @port: Master port to issue transaction
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*
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* Marks the component tag CSR on each device with the enumeration
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* complete flag. When complete, it then release the host locks on
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* each device. Returns 0 on success or %-EINVAL on failure.
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*/
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static int rio_clear_locks(struct rio_mport *port)
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{
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struct rio_dev *rdev;
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u32 result;
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int ret = 0;
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/* Write component tag CSR magic complete value */
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rio_local_write_config_32(port, RIO_COMPONENT_TAG_CSR,
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RIO_ENUM_CMPL_MAGIC);
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list_for_each_entry(rdev, &rio_devices, global_list)
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rio_write_config_32(rdev, RIO_COMPONENT_TAG_CSR,
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RIO_ENUM_CMPL_MAGIC);
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/* Release host device id locks */
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rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
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port->host_deviceid);
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rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
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if ((result & 0xffff) != 0xffff) {
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printk(KERN_INFO
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"RIO: badness when releasing host lock on master port, result %8.8x\n",
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result);
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ret = -EINVAL;
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}
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list_for_each_entry(rdev, &rio_devices, global_list) {
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rio_write_config_32(rdev, RIO_HOST_DID_LOCK_CSR,
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port->host_deviceid);
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rio_read_config_32(rdev, RIO_HOST_DID_LOCK_CSR, &result);
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if ((result & 0xffff) != 0xffff) {
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printk(KERN_INFO
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"RIO: badness when releasing host lock on vid %4.4x did %4.4x\n",
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rdev->vid, rdev->did);
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ret = -EINVAL;
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}
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}
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return ret;
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}
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/**
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* rio_enum_host- Set host lock and initialize host destination ID
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* @port: Master port to issue transaction
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*
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* Sets the local host master port lock and destination ID register
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* with the host device ID value. The host device ID value is provided
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* by the platform. Returns %0 on success or %-1 on failure.
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*/
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static int rio_enum_host(struct rio_mport *port)
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{
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u32 result;
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/* Set master port host device id lock */
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rio_local_write_config_32(port, RIO_HOST_DID_LOCK_CSR,
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port->host_deviceid);
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rio_local_read_config_32(port, RIO_HOST_DID_LOCK_CSR, &result);
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if ((result & 0xffff) != port->host_deviceid)
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return -1;
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/* Set master port destid and init destid ctr */
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rio_local_set_device_id(port, port->host_deviceid);
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if (next_destid == port->host_deviceid)
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next_destid++;
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return 0;
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}
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/**
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* rio_device_has_destid- Test if a device contains a destination ID register
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* @port: Master port to issue transaction
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* @src_ops: RIO device source operations
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* @dst_ops: RIO device destination operations
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*
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* Checks the provided @src_ops and @dst_ops for the necessary transaction
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* capabilities that indicate whether or not a device will implement a
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* destination ID register. Returns 1 if true or 0 if false.
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*/
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static int rio_device_has_destid(struct rio_mport *port, int src_ops,
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int dst_ops)
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{
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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;
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return !!((src_ops | dst_ops) & mask);
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}
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/**
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* rio_release_dev- Frees a RIO device struct
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* @dev: LDM device associated with a RIO device struct
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*
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* Gets the RIO device struct associated a RIO device struct.
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* The RIO device struct is freed.
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*/
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static void rio_release_dev(struct device *dev)
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{
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struct rio_dev *rdev;
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rdev = to_rio_dev(dev);
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kfree(rdev);
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}
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/**
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* rio_is_switch- Tests if a RIO device has switch capabilities
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* @rdev: RIO device
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*
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* Gets the RIO device Processing Element Features register
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* contents and tests for switch capabilities. Returns 1 if
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* the device is a switch or 0 if it is not a switch.
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* The RIO device struct is freed.
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*/
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static int rio_is_switch(struct rio_dev *rdev)
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{
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if (rdev->pef & RIO_PEF_SWITCH)
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return 1;
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return 0;
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}
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/**
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* rio_route_set_ops- Sets routing operations for a particular vendor switch
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* @rdev: RIO device
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*
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* Searches the RIO route ops table for known switch types. If the vid
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* and did match a switch table entry, then set the add_entry() and
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* get_entry() ops to the table entry values.
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*/
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static void rio_route_set_ops(struct rio_dev *rdev)
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{
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struct rio_route_ops *cur = __start_rio_route_ops;
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struct rio_route_ops *end = __end_rio_route_ops;
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while (cur < end) {
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if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
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pr_debug("RIO: adding routing ops for %s\n", rio_name(rdev));
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rdev->rswitch->add_entry = cur->add_hook;
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rdev->rswitch->get_entry = cur->get_hook;
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}
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cur++;
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}
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if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
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printk(KERN_ERR "RIO: missing routing ops for %s\n",
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rio_name(rdev));
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}
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/**
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* rio_add_device- Adds a RIO device to the device model
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* @rdev: RIO device
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*
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* Adds the RIO device to the global device list and adds the RIO
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* device to the RIO device list. Creates the generic sysfs nodes
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* for an RIO device.
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*/
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static void __devinit rio_add_device(struct rio_dev *rdev)
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{
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device_add(&rdev->dev);
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spin_lock(&rio_global_list_lock);
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list_add_tail(&rdev->global_list, &rio_devices);
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spin_unlock(&rio_global_list_lock);
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rio_create_sysfs_dev_files(rdev);
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}
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/**
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* rio_setup_device- Allocates and sets up a RIO device
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* @net: RIO network
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* @port: Master port to send transactions
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* @destid: Current destination ID
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* @hopcount: Current hopcount
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* @do_enum: Enumeration/Discovery mode flag
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*
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* Allocates a RIO device and configures fields based on configuration
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* space contents. If device has a destination ID register, a destination
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* ID is either assigned in enumeration mode or read from configuration
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* space in discovery mode. If the device has switch capabilities, then
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* a switch is allocated and configured appropriately. Returns a pointer
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* to a RIO device on success or NULL on failure.
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*
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*/
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static struct rio_dev *rio_setup_device(struct rio_net *net,
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struct rio_mport *port, u16 destid,
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u8 hopcount, int do_enum)
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{
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struct rio_dev *rdev;
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struct rio_switch *rswitch;
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int result, rdid;
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rdev = kzalloc(sizeof(struct rio_dev), GFP_KERNEL);
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if (!rdev)
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goto out;
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rdev->net = net;
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rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_ID_CAR,
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&result);
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rdev->did = result >> 16;
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rdev->vid = result & 0xffff;
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rio_mport_read_config_32(port, destid, hopcount, RIO_DEV_INFO_CAR,
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&rdev->device_rev);
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rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_ID_CAR,
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&result);
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rdev->asm_did = result >> 16;
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rdev->asm_vid = result & 0xffff;
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rio_mport_read_config_32(port, destid, hopcount, RIO_ASM_INFO_CAR,
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&result);
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rdev->asm_rev = result >> 16;
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rio_mport_read_config_32(port, destid, hopcount, RIO_PEF_CAR,
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&rdev->pef);
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if (rdev->pef & RIO_PEF_EXT_FEATURES)
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rdev->efptr = result & 0xffff;
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rio_mport_read_config_32(port, destid, hopcount, RIO_SRC_OPS_CAR,
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&rdev->src_ops);
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rio_mport_read_config_32(port, destid, hopcount, RIO_DST_OPS_CAR,
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&rdev->dst_ops);
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if (rio_device_has_destid(port, rdev->src_ops, rdev->dst_ops)) {
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if (do_enum) {
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rio_set_device_id(port, destid, hopcount, next_destid);
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rdev->destid = next_destid++;
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if (next_destid == port->host_deviceid)
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next_destid++;
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} else
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rdev->destid = rio_get_device_id(port, destid, hopcount);
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} else
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/* Switch device has an associated destID */
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rdev->destid = RIO_INVALID_DESTID;
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/* If a PE has both switch and other functions, show it as a switch */
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if (rio_is_switch(rdev)) {
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rio_mport_read_config_32(port, destid, hopcount,
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RIO_SWP_INFO_CAR, &rdev->swpinfo);
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rswitch = kmalloc(sizeof(struct rio_switch), GFP_KERNEL);
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if (!rswitch) {
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kfree(rdev);
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rdev = NULL;
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goto out;
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}
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rswitch->switchid = next_switchid;
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rswitch->hopcount = hopcount;
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rswitch->destid = destid;
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rswitch->route_table = kzalloc(sizeof(u8)*
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RIO_MAX_ROUTE_ENTRIES(port->sys_size),
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GFP_KERNEL);
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if (!rswitch->route_table) {
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kfree(rdev);
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rdev = NULL;
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kfree(rswitch);
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goto out;
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}
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/* Initialize switch route table */
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for (rdid = 0; rdid < RIO_MAX_ROUTE_ENTRIES(port->sys_size);
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rdid++)
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rswitch->route_table[rdid] = RIO_INVALID_ROUTE;
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rdev->rswitch = rswitch;
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dev_set_name(&rdev->dev, "%02x:s:%04x", rdev->net->id,
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rdev->rswitch->switchid);
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rio_route_set_ops(rdev);
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list_add_tail(&rswitch->node, &rio_switches);
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} else
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dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
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rdev->destid);
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rdev->dev.bus = &rio_bus_type;
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device_initialize(&rdev->dev);
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rdev->dev.release = rio_release_dev;
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rio_dev_get(rdev);
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rdev->dma_mask = DMA_32BIT_MASK;
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rdev->dev.dma_mask = &rdev->dma_mask;
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rdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
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if ((rdev->pef & RIO_PEF_INB_DOORBELL) &&
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(rdev->dst_ops & RIO_DST_OPS_DOORBELL))
|
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rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
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0, 0xffff);
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rio_add_device(rdev);
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out:
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return rdev;
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}
|
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|
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/**
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* rio_sport_is_active- Tests if a switch port has an active connection.
|
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* @port: Master port to send transaction
|
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* @destid: Associated destination ID for switch
|
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* @hopcount: Hopcount to reach switch
|
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* @sport: Switch port number
|
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*
|
|
* Reads the port error status CSR for a particular switch port to
|
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* determine if the port has an active link. Returns
|
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* %PORT_N_ERR_STS_PORT_OK if the port is active or %0 if it is
|
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* inactive.
|
|
*/
|
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static int
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rio_sport_is_active(struct rio_mport *port, u16 destid, u8 hopcount, int sport)
|
|
{
|
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u32 result;
|
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u32 ext_ftr_ptr;
|
|
|
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int *entry = rio_sport_phys_table;
|
|
|
|
do {
|
|
if ((ext_ftr_ptr =
|
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rio_mport_get_feature(port, 0, destid, hopcount, *entry)))
|
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|
|
break;
|
|
} while (*++entry >= 0);
|
|
|
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if (ext_ftr_ptr)
|
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rio_mport_read_config_32(port, destid, hopcount,
|
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ext_ftr_ptr +
|
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RIO_PORT_N_ERR_STS_CSR(sport),
|
|
&result);
|
|
|
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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
|
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* %RIO_GLOBAL_TABLE in @table. Returns %0 on success or %-EINVAL
|
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* 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(port->sys_size), 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(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);
|
|
} else
|
|
return -1;
|
|
|
|
if (rio_is_switch(rdev)) {
|
|
next_switchid++;
|
|
sw_inport = rio_get_swpinfo_inport(port,
|
|
RIO_ANY_DESTID(port->sys_size), 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(port->sys_size),
|
|
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(port->sys_size), 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->sys_size),
|
|
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(port->sys_size);
|
|
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 __devinit 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(rdev->net->hport->sys_size);
|
|
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 __devinit 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(mport->sys_size),
|
|
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;
|
|
}
|
|
|