1157 lines
31 KiB
C
1157 lines
31 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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* Copyright 2009 Integrated Device Technology, Inc.
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* Alex Bounine <alexandre.bounine@idt.com>
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* - Added Port-Write/Error Management initialization and handling
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*
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* Copyright 2009 Sysgo AG
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* Thomas Moll <thomas.moll@sysgo.com>
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* - Added Input- Output- enable functionality, to allow full communication
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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/sched.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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static void rio_init_em(struct rio_dev *rdev);
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struct rio_id_table {
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u16 start; /* logical minimal id */
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u32 max; /* max number of IDs in table */
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spinlock_t lock;
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unsigned long table[];
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};
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static int next_destid = 0;
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static int next_comptag = 1;
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/**
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* rio_destid_alloc - Allocate next available destID for given network
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* @net: RIO network
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*
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* Returns next available device destination ID for the specified RIO network.
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* Marks allocated ID as one in use.
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* Returns RIO_INVALID_DESTID if new destID is not available.
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*/
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static u16 rio_destid_alloc(struct rio_net *net)
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{
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int destid;
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struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
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spin_lock(&idtab->lock);
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destid = find_first_zero_bit(idtab->table, idtab->max);
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if (destid < idtab->max) {
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set_bit(destid, idtab->table);
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destid += idtab->start;
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} else
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destid = RIO_INVALID_DESTID;
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spin_unlock(&idtab->lock);
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return (u16)destid;
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}
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/**
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* rio_destid_reserve - Reserve the specified destID
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* @net: RIO network
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* @destid: destID to reserve
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*
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* Tries to reserve the specified destID.
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* Returns 0 if successful.
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*/
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static int rio_destid_reserve(struct rio_net *net, u16 destid)
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{
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int oldbit;
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struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
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destid -= idtab->start;
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spin_lock(&idtab->lock);
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oldbit = test_and_set_bit(destid, idtab->table);
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spin_unlock(&idtab->lock);
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return oldbit;
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}
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/**
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* rio_destid_free - free a previously allocated destID
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* @net: RIO network
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* @destid: destID to free
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*
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* Makes the specified destID available for use.
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*/
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static void rio_destid_free(struct rio_net *net, u16 destid)
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{
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struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
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destid -= idtab->start;
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spin_lock(&idtab->lock);
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clear_bit(destid, idtab->table);
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spin_unlock(&idtab->lock);
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}
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/**
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* rio_destid_first - return first destID in use
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* @net: RIO network
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*/
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static u16 rio_destid_first(struct rio_net *net)
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{
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int destid;
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struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
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spin_lock(&idtab->lock);
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destid = find_first_bit(idtab->table, idtab->max);
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if (destid >= idtab->max)
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destid = RIO_INVALID_DESTID;
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else
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destid += idtab->start;
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spin_unlock(&idtab->lock);
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return (u16)destid;
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}
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/**
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* rio_destid_next - return next destID in use
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* @net: RIO network
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* @from: destination ID from which search shall continue
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*/
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static u16 rio_destid_next(struct rio_net *net, u16 from)
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{
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int destid;
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struct rio_id_table *idtab = (struct rio_id_table *)net->enum_data;
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spin_lock(&idtab->lock);
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destid = find_next_bit(idtab->table, idtab->max, from);
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if (destid >= idtab->max)
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destid = RIO_INVALID_DESTID;
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else
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destid += idtab->start;
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spin_unlock(&idtab->lock);
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return (u16)destid;
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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_clear_locks- Release all host locks and signal enumeration complete
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* @net: RIO network to run on
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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_net *net)
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{
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struct rio_mport *port = net->hport;
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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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/* 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, &net->devices, net_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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/* Mark device as discovered and enable master */
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rio_read_config_32(rdev,
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rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
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&result);
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result |= RIO_PORT_GEN_DISCOVERED | RIO_PORT_GEN_MASTER;
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rio_write_config_32(rdev,
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rdev->phys_efptr + RIO_PORT_GEN_CTL_CSR,
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result);
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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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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_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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int ret = 0;
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struct rio_dev *rdev;
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struct rio_switch *rswitch = NULL;
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int result, rdid;
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size_t size;
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u32 swpinfo = 0;
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size = sizeof(*rdev);
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if (rio_mport_read_config_32(port, destid, hopcount,
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RIO_PEF_CAR, &result))
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return NULL;
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|
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if (result & (RIO_PEF_SWITCH | RIO_PEF_MULTIPORT)) {
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rio_mport_read_config_32(port, destid, hopcount,
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RIO_SWP_INFO_CAR, &swpinfo);
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if (result & RIO_PEF_SWITCH)
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size += struct_size(rswitch, nextdev, RIO_GET_TOTAL_PORTS(swpinfo));
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|
}
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|
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rdev = kzalloc(size, GFP_KERNEL);
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|
if (!rdev)
|
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return NULL;
|
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|
|
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|
rdev->net = net;
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rdev->pef = result;
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|
rdev->swpinfo = swpinfo;
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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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if (rdev->pef & RIO_PEF_EXT_FEATURES) {
|
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rdev->efptr = result & 0xffff;
|
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rdev->phys_efptr = rio_mport_get_physefb(port, 0, destid,
|
||
|
hopcount, &rdev->phys_rmap);
|
||
|
pr_debug("RIO: %s Register Map %d device\n",
|
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|
__func__, rdev->phys_rmap);
|
||
|
|
||
|
rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
|
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|
hopcount, RIO_EFB_ERR_MGMNT);
|
||
|
if (!rdev->em_efptr)
|
||
|
rdev->em_efptr = rio_mport_get_feature(port, 0, destid,
|
||
|
hopcount, RIO_EFB_ERR_MGMNT_HS);
|
||
|
}
|
||
|
|
||
|
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++;
|
||
|
rdev->do_enum = true;
|
||
|
} 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->port_ok = 0;
|
||
|
spin_lock_init(&rswitch->lock);
|
||
|
rswitch->route_table =
|
||
|
kzalloc(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,
|
||
|
rdev->comp_tag & RIO_CTAG_UDEVID);
|
||
|
|
||
|
if (do_enum)
|
||
|
rio_route_clr_table(rdev, RIO_GLOBAL_TABLE, 0);
|
||
|
} else {
|
||
|
if (do_enum)
|
||
|
/*Enable Input Output Port (transmitter receiver)*/
|
||
|
rio_enable_rx_tx_port(port, 0, destid, hopcount, 0);
|
||
|
|
||
|
dev_set_name(&rdev->dev, "%02x:e:%04x", rdev->net->id,
|
||
|
rdev->comp_tag & RIO_CTAG_UDEVID);
|
||
|
}
|
||
|
|
||
|
rdev->dev.parent = &net->dev;
|
||
|
rio_attach_device(rdev);
|
||
|
rdev->dev.release = rio_release_dev;
|
||
|
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) {
|
||
|
if (rswitch)
|
||
|
kfree(rswitch->route_table);
|
||
|
put_device(&rdev->dev);
|
||
|
return NULL;
|
||
|
}
|
||
|
|
||
|
rio_dev_get(rdev);
|
||
|
|
||
|
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.
|
||
|
* @rdev: RapidIO device object
|
||
|
* @sp: 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_dev *rdev, int sp)
|
||
|
{
|
||
|
u32 result = 0;
|
||
|
|
||
|
rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, sp),
|
||
|
&result);
|
||
|
|
||
|
return result & RIO_PORT_N_ERR_STS_PORT_OK;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* 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 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) {
|
||
|
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(rdev, 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 */
|
||
|
if ((rdev->src_ops & RIO_SRC_OPS_PORT_WRITE) &&
|
||
|
(rdev->em_efptr)) {
|
||
|
rio_write_config_32(rdev,
|
||
|
rdev->em_efptr + RIO_EM_PW_TGT_DEVID,
|
||
|
(port->host_deviceid << 16) |
|
||
|
(port->sys_size << 15));
|
||
|
}
|
||
|
|
||
|
rio_init_em(rdev);
|
||
|
|
||
|
/* Check for empty switch */
|
||
|
if (next_destid == sw_destid)
|
||
|
next_destid = rio_destid_alloc(net);
|
||
|
|
||
|
rdev->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 PGCCSR discovered bit for non-zero value (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 regval;
|
||
|
|
||
|
rio_local_read_config_32(port, port->phys_efptr + RIO_PORT_GEN_CTL_CSR,
|
||
|
®val);
|
||
|
return (regval & RIO_PORT_GEN_DISCOVERED) ? 1 : 0;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* 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
|
||
|
* @prev: previous rio_dev
|
||
|
* @prev_port: previous port number
|
||
|
*
|
||
|
* 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, struct rio_dev *prev, int prev_port)
|
||
|
{
|
||
|
u8 port_num, route_port;
|
||
|
struct rio_dev *rdev;
|
||
|
u16 ndestid;
|
||
|
|
||
|
/* Setup new RIO device */
|
||
|
if ((rdev = rio_setup_device(net, port, destid, hopcount, 0))) {
|
||
|
rdev->prev = prev;
|
||
|
if (prev && rio_is_switch(prev))
|
||
|
prev->rswitch->nextdev[prev_port] = rdev;
|
||
|
} else
|
||
|
return -1;
|
||
|
|
||
|
if (rio_is_switch(rdev)) {
|
||
|
/* Associated destid is how we accessed this switch */
|
||
|
rdev->destid = destid;
|
||
|
|
||
|
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));
|
||
|
for (port_num = 0;
|
||
|
port_num < RIO_GET_TOTAL_PORTS(rdev->swpinfo);
|
||
|
port_num++) {
|
||
|
if (RIO_GET_PORT_NUM(rdev->swpinfo) == port_num)
|
||
|
continue;
|
||
|
|
||
|
if (rio_sport_is_active(rdev, port_num)) {
|
||
|
pr_debug(
|
||
|
"RIO: scanning device on port %d\n",
|
||
|
port_num);
|
||
|
|
||
|
rio_lock_device(port, destid, hopcount, 1000);
|
||
|
|
||
|
for (ndestid = 0;
|
||
|
ndestid < RIO_ANY_DESTID(port->sys_size);
|
||
|
ndestid++) {
|
||
|
rio_route_get_entry(rdev,
|
||
|
RIO_GLOBAL_TABLE,
|
||
|
ndestid,
|
||
|
&route_port, 0);
|
||
|
if (route_port == port_num)
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
if (ndestid == RIO_ANY_DESTID(port->sys_size))
|
||
|
continue;
|
||
|
rio_unlock_device(port, destid, hopcount);
|
||
|
if (rio_disc_peer(net, port, ndestid,
|
||
|
hopcount + 1, rdev, port_num) < 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
|
||
|
* %RIO_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;
|
||
|
|
||
|
rio_local_read_config_32(port,
|
||
|
port->phys_efptr +
|
||
|
RIO_PORT_N_ERR_STS_CSR(port->index, port->phys_rmap),
|
||
|
&result);
|
||
|
return result & RIO_PORT_N_ERR_STS_PORT_OK;
|
||
|
}
|
||
|
|
||
|
static void rio_scan_release_net(struct rio_net *net)
|
||
|
{
|
||
|
pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
|
||
|
kfree(net->enum_data);
|
||
|
}
|
||
|
|
||
|
static void rio_scan_release_dev(struct device *dev)
|
||
|
{
|
||
|
struct rio_net *net;
|
||
|
|
||
|
net = to_rio_net(dev);
|
||
|
pr_debug("RIO-SCAN: %s: net_%d\n", __func__, net->id);
|
||
|
kfree(net);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* rio_scan_alloc_net - Allocate and configure a new RIO network
|
||
|
* @mport: Master port associated with the RIO network
|
||
|
* @do_enum: Enumeration/Discovery mode flag
|
||
|
* @start: logical minimal start id for new net
|
||
|
*
|
||
|
* Allocates a new RIO network structure and initializes enumerator-specific
|
||
|
* part of it (if required).
|
||
|
* Returns a RIO network pointer on success or %NULL on failure.
|
||
|
*/
|
||
|
static struct rio_net *rio_scan_alloc_net(struct rio_mport *mport,
|
||
|
int do_enum, u16 start)
|
||
|
{
|
||
|
struct rio_net *net;
|
||
|
|
||
|
net = rio_alloc_net(mport);
|
||
|
|
||
|
if (net && do_enum) {
|
||
|
struct rio_id_table *idtab;
|
||
|
size_t size;
|
||
|
|
||
|
size = sizeof(struct rio_id_table) +
|
||
|
BITS_TO_LONGS(
|
||
|
RIO_MAX_ROUTE_ENTRIES(mport->sys_size)
|
||
|
) * sizeof(long);
|
||
|
|
||
|
idtab = kzalloc(size, GFP_KERNEL);
|
||
|
|
||
|
if (idtab == NULL) {
|
||
|
pr_err("RIO: failed to allocate destID table\n");
|
||
|
rio_free_net(net);
|
||
|
net = NULL;
|
||
|
} else {
|
||
|
net->enum_data = idtab;
|
||
|
net->release = rio_scan_release_net;
|
||
|
idtab->start = start;
|
||
|
idtab->max = RIO_MAX_ROUTE_ENTRIES(mport->sys_size);
|
||
|
spin_lock_init(&idtab->lock);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (net) {
|
||
|
net->id = mport->id;
|
||
|
net->hport = mport;
|
||
|
dev_set_name(&net->dev, "rnet_%d", net->id);
|
||
|
net->dev.parent = &mport->dev;
|
||
|
net->dev.release = rio_scan_release_dev;
|
||
|
rio_add_net(net);
|
||
|
}
|
||
|
|
||
|
return net;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* rio_update_route_tables- Updates route tables in switches
|
||
|
* @net: RIO network to run update on
|
||
|
*
|
||
|
* For each enumerated device, ensure that each switch in a system
|
||
|
* has correct routing entries. Add routes for devices that where
|
||
|
* unknown during the first enumeration pass through the switch.
|
||
|
*/
|
||
|
static void rio_update_route_tables(struct rio_net *net)
|
||
|
{
|
||
|
struct rio_dev *rdev, *swrdev;
|
||
|
struct rio_switch *rswitch;
|
||
|
u8 sport;
|
||
|
u16 destid;
|
||
|
|
||
|
list_for_each_entry(rdev, &net->devices, net_list) {
|
||
|
|
||
|
destid = rdev->destid;
|
||
|
|
||
|
list_for_each_entry(rswitch, &net->switches, node) {
|
||
|
|
||
|
if (rio_is_switch(rdev) && (rdev->rswitch == rswitch))
|
||
|
continue;
|
||
|
|
||
|
if (RIO_INVALID_ROUTE == rswitch->route_table[destid]) {
|
||
|
swrdev = sw_to_rio_dev(rswitch);
|
||
|
|
||
|
/* Skip if destid ends in empty switch*/
|
||
|
if (swrdev->destid == destid)
|
||
|
continue;
|
||
|
|
||
|
sport = RIO_GET_PORT_NUM(swrdev->swpinfo);
|
||
|
|
||
|
rio_route_add_entry(swrdev, RIO_GLOBAL_TABLE,
|
||
|
destid, sport, 0);
|
||
|
rswitch->route_table[destid] = sport;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* rio_init_em - Initializes RIO Error Management (for switches)
|
||
|
* @rdev: RIO device
|
||
|
*
|
||
|
* For each enumerated switch, call device-specific error management
|
||
|
* initialization routine (if supplied by the switch driver).
|
||
|
*/
|
||
|
static void rio_init_em(struct rio_dev *rdev)
|
||
|
{
|
||
|
if (rio_is_switch(rdev) && (rdev->em_efptr) &&
|
||
|
rdev->rswitch->ops && rdev->rswitch->ops->em_init) {
|
||
|
rdev->rswitch->ops->em_init(rdev);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* rio_enum_mport- Start enumeration through a master port
|
||
|
* @mport: Master port to send transactions
|
||
|
* @flags: Enumeration control flags
|
||
|
*
|
||
|
* 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.
|
||
|
*/
|
||
|
static int rio_enum_mport(struct rio_mport *mport, u32 flags)
|
||
|
{
|
||
|
struct rio_net *net = NULL;
|
||
|
int rc = 0;
|
||
|
|
||
|
printk(KERN_INFO "RIO: enumerate master port %d, %s\n", mport->id,
|
||
|
mport->name);
|
||
|
|
||
|
/*
|
||
|
* To avoid multiple start requests (repeat enumeration is not supported
|
||
|
* by this method) check if enumeration/discovery was performed for this
|
||
|
* mport: if mport was added into the list of mports for a net exit
|
||
|
* with error.
|
||
|
*/
|
||
|
if (mport->nnode.next || mport->nnode.prev)
|
||
|
return -EBUSY;
|
||
|
|
||
|
/* 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)) {
|
||
|
net = rio_scan_alloc_net(mport, 1, 0);
|
||
|
if (!net) {
|
||
|
printk(KERN_ERR "RIO: failed to allocate new net\n");
|
||
|
rc = -ENOMEM;
|
||
|
goto out;
|
||
|
}
|
||
|
|
||
|
/* reserve mport destID in new net */
|
||
|
rio_destid_reserve(net, mport->host_deviceid);
|
||
|
|
||
|
/* Enable Input Output Port (transmitter receiver) */
|
||
|
rio_enable_rx_tx_port(mport, 1, 0, 0, 0);
|
||
|
|
||
|
/* Set component tag for host */
|
||
|
rio_local_write_config_32(mport, RIO_COMPONENT_TAG_CSR,
|
||
|
next_comptag++);
|
||
|
|
||
|
next_destid = rio_destid_alloc(net);
|
||
|
|
||
|
if (rio_enum_peer(net, mport, 0, NULL, 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(net);
|
||
|
rc = -EBUSY;
|
||
|
goto out;
|
||
|
}
|
||
|
/* free the last allocated destID (unused) */
|
||
|
rio_destid_free(net, next_destid);
|
||
|
rio_update_route_tables(net);
|
||
|
rio_clear_locks(net);
|
||
|
rio_pw_enable(mport, 1);
|
||
|
} 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
|
||
|
* @net: RIO network to run route tables scan on
|
||
|
*
|
||
|
* For each switch device, generate a route table by copying existing
|
||
|
* route entries from the switch.
|
||
|
*/
|
||
|
static void rio_build_route_tables(struct rio_net *net)
|
||
|
{
|
||
|
struct rio_switch *rswitch;
|
||
|
struct rio_dev *rdev;
|
||
|
int i;
|
||
|
u8 sport;
|
||
|
|
||
|
list_for_each_entry(rswitch, &net->switches, node) {
|
||
|
rdev = sw_to_rio_dev(rswitch);
|
||
|
|
||
|
rio_lock_device(net->hport, rdev->destid,
|
||
|
rdev->hopcount, 1000);
|
||
|
for (i = 0;
|
||
|
i < RIO_MAX_ROUTE_ENTRIES(net->hport->sys_size);
|
||
|
i++) {
|
||
|
if (rio_route_get_entry(rdev, RIO_GLOBAL_TABLE,
|
||
|
i, &sport, 0) < 0)
|
||
|
continue;
|
||
|
rswitch->route_table[i] = sport;
|
||
|
}
|
||
|
|
||
|
rio_unlock_device(net->hport, rdev->destid, rdev->hopcount);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* rio_disc_mport- Start discovery through a master port
|
||
|
* @mport: Master port to send transactions
|
||
|
* @flags: discovery control flags
|
||
|
*
|
||
|
* Starts the discovery process. If we have an active link,
|
||
|
* then wait for the signal that enumeration is complete (if wait
|
||
|
* is allowed).
|
||
|
* When enumeration completion is signaled, start recursive
|
||
|
* peer discovery. Returns %0 if discovery succeeds or %-EBUSY
|
||
|
* on failure.
|
||
|
*/
|
||
|
static int rio_disc_mport(struct rio_mport *mport, u32 flags)
|
||
|
{
|
||
|
struct rio_net *net = NULL;
|
||
|
unsigned long to_end;
|
||
|
|
||
|
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 (rio_enum_complete(mport))
|
||
|
goto enum_done;
|
||
|
else if (flags & RIO_SCAN_ENUM_NO_WAIT)
|
||
|
return -EAGAIN;
|
||
|
|
||
|
pr_debug("RIO: wait for enumeration to complete...\n");
|
||
|
|
||
|
to_end = jiffies + CONFIG_RAPIDIO_DISC_TIMEOUT * HZ;
|
||
|
while (time_before(jiffies, to_end)) {
|
||
|
if (rio_enum_complete(mport))
|
||
|
goto enum_done;
|
||
|
msleep(10);
|
||
|
}
|
||
|
|
||
|
pr_debug("RIO: discovery timeout on mport %d %s\n",
|
||
|
mport->id, mport->name);
|
||
|
goto bail;
|
||
|
enum_done:
|
||
|
pr_debug("RIO: ... enumeration done\n");
|
||
|
|
||
|
net = rio_scan_alloc_net(mport, 0, 0);
|
||
|
if (!net) {
|
||
|
printk(KERN_ERR "RIO: Failed to allocate new net\n");
|
||
|
goto bail;
|
||
|
}
|
||
|
|
||
|
/* Read DestID assigned by enumerator */
|
||
|
rio_local_read_config_32(mport, RIO_DID_CSR,
|
||
|
&mport->host_deviceid);
|
||
|
mport->host_deviceid = RIO_GET_DID(mport->sys_size,
|
||
|
mport->host_deviceid);
|
||
|
|
||
|
if (rio_disc_peer(net, mport, RIO_ANY_DESTID(mport->sys_size),
|
||
|
0, NULL, 0) < 0) {
|
||
|
printk(KERN_INFO
|
||
|
"RIO: master port %d device has failed discovery\n",
|
||
|
mport->id);
|
||
|
goto bail;
|
||
|
}
|
||
|
|
||
|
rio_build_route_tables(net);
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
bail:
|
||
|
return -EBUSY;
|
||
|
}
|
||
|
|
||
|
static struct rio_scan rio_scan_ops = {
|
||
|
.owner = THIS_MODULE,
|
||
|
.enumerate = rio_enum_mport,
|
||
|
.discover = rio_disc_mport,
|
||
|
};
|
||
|
|
||
|
static bool scan;
|
||
|
module_param(scan, bool, 0);
|
||
|
MODULE_PARM_DESC(scan, "Start RapidIO network enumeration/discovery "
|
||
|
"(default = 0)");
|
||
|
|
||
|
/**
|
||
|
* rio_basic_attach:
|
||
|
*
|
||
|
* When this enumeration/discovery method is loaded as a module this function
|
||
|
* registers its specific enumeration and discover routines for all available
|
||
|
* RapidIO mport devices. The "scan" command line parameter controls ability of
|
||
|
* the module to start RapidIO enumeration/discovery automatically.
|
||
|
*
|
||
|
* Returns 0 for success or -EIO if unable to register itself.
|
||
|
*
|
||
|
* This enumeration/discovery method cannot be unloaded and therefore does not
|
||
|
* provide a matching cleanup_module routine.
|
||
|
*/
|
||
|
|
||
|
static int __init rio_basic_attach(void)
|
||
|
{
|
||
|
if (rio_register_scan(RIO_MPORT_ANY, &rio_scan_ops))
|
||
|
return -EIO;
|
||
|
if (scan)
|
||
|
rio_init_mports();
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
late_initcall(rio_basic_attach);
|
||
|
|
||
|
MODULE_DESCRIPTION("Basic RapidIO enumeration/discovery");
|
||
|
MODULE_LICENSE("GPL");
|