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@ -1,353 +0,0 @@
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.\" Copyright (c) 2003
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.\" Fraunhofer Institute for Open Communication Systems (FhG Fokus).
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" Author: Hartmut Brandt <harti@FreeBSD.org>
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.\"
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.\" $FreeBSD$
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.\"
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.Dd May 8, 2003
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.Dt UTOPIA 9
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.Os
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.Sh NAME
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.Nm utopia
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.Nd "driver module for ATM PHY chips"
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.Sh SYNOPSIS
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.In dev/utopia/utopia.h
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.Ft int
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.Fo utopia_attach
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.Fa "struct utopia *utp" "struct ifatm *ifatm" "struct ifmedia *media"
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.Fa "struct mtx *lock" "struct sysctl_ctx_list *ctx"
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.Fa "struct sysctl_oid_list *tree" "const struct utopia_methods *vtab"
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.Fc
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.Ft void
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.Fn utopia_detach "struct utopia *utp"
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.Ft int
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.Fn utopia_start "struct utopia *utp"
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.Ft void
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.Fn utopia_stop "struct utopia *utp"
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.Ft void
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.Fn utopia_init_media "struct utopia *utp"
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.Ft void
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.Fn utopia_reset_media "struct utopia *utp"
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.Ft int
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.Fn utopia_reset "struct utopia *utp"
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.Ft int
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.Fn utopia_set_sdh "struct utopia *utp" "int sdh"
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.Ft int
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.Fn utopia_set_unass "struct utopia *utp" "int unass"
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.Ft int
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.Fn utopia_set_noscramb "struct utopia *utp" "int noscramb"
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.Ft int
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.Fn utopia_update_carrier "struct utopia *utp"
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.Ft int
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.Fn utopia_set_loopback "struct utopia *utp" "u_int mode"
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.Ft void
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.Fn utopia_intr "struct utopia *utp"
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.Ft void
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.Fn utopia_update_stats "struct utopia *utp"
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.Sh DESCRIPTION
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This module is used by all ATM drivers for cards that use a number of known
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PHY chips to provide uniform functionality.
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The module implements status monitoring in either interrupt or polling mode,
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media option handling and application access to PHY registers.
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.Pp
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To use this interface, a driver must implement two functions for reading and
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writing PHY registers, and initialize the following structure with pointers
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to these functions:
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.Bd -literal -offset indent
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struct utopia_methods {
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int (*readregs)(struct ifatm *, u_int reg,
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uint8_t *val, u_int *n);
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int (*writereg)(struct ifatm *, u_int reg,
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u_int mask, u_int val);
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};
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.Ed
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.Pp
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The
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.Fn readregs
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function should read PHY registers starting at register
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.Fa reg .
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The maximum number of registers to read is given by the integer pointed
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to by
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.Fa n .
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The function should either return 0 on success, or an error code.
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In the first case,
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.Fa *n
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should be set to the actual number of registers read.
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The
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.Fn writereg
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function should write one register.
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It must change all bits for which the corresponding bit in
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.Fa mask
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is 1 to the value of the corresponding bit in
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.Fa val .
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It returns either 0 on success, or an error code.
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.Pp
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The ATM driver's private state block
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.Pq Va softc
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must begin with a
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.Vt "struct ifatm" .
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.Pp
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The
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.Vt "struct utopia"
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holds the current state of the PHY chip and contains the following fields:
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.Bd -literal -offset indent
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struct utopia {
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struct ifatm *ifatm; /* driver data */
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struct ifmedia *media; /* driver supplied */
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struct mtx *lock; /* driver supplied */
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const struct utopia_methods *methods;
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LIST_ENTRY(utopia) link; /* list of these structures */
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u_int flags; /* flags set by the driver */
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u_int state; /* current state */
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u_int carrier; /* carrier state */
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u_int loopback; /* loopback mode */
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const struct utopia_chip *chip; /* chip operations */
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struct utopia_stats1 stats; /* statistics */
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};
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.Ed
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The public accessible fields have the following functions:
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.Bl -tag -width indent
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.It Va ifatm
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Pointer to the driver's private data
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.Pq Va softc .
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.It Va media
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Pointer to the driver's media structure.
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.It Va lock
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Pointer to a mutex provided by the driver.
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This mutex is used to synchronize
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with the kernel thread that handles device polling.
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It is locked in several
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places:
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.Bl -enum -offset indent
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.It
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In
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.Fn utopia_detach
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the mutex is locked to sleep and wait for the kernel thread to remove the
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.Vt "struct utopia"
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from the list of all
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.Nm
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devices.
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Before returning to the caller the mutex is unlocked.
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.It
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In the
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.Nm
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kernel thread the mutex is locked, and the
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.Fn utopia_carrier_update
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function is called with this mutex locked.
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This will result in the driver's
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.Fn readregs
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function being called with the mutex locked.
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.It
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In the sysctl handlers the mutex will be locked before calling into the driver's
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.Fn readreg
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or
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.Fn writereg
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functions.
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.El
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.It Va flags
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Flags set by either the driver or the
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.Nm
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module.
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The following flags are
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defined:
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.Bl -tag -width indent
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.It Dv UTP_FL_NORESET
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If this flag is set, the module will not try to write the
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SUNI master reset register.
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(Set by the driver.)
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.It Dv UTP_FL_POLL_CARRIER
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If this flag is set, the module will periodically poll the carrier state
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(as opposed to interrupt driven carrier state changes).
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(Set by the driver.)
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.El
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.It Va state
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Flags describing the current state of the PHY chip.
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These are managed
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by the module:
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.Bl -tag -width indent
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.It Dv UTP_ST_ACTIVE
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The driver is active and the PHY registers can be accessed.
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This is set by calling
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.Fn utopia_start ,
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which should be called either in the attach routine of the driver or
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in the network interface initialisation routine (depending on whether the
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registers are accessible all the time or only when the interface is up).
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.It Dv UTP_ST_SDH
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Interface is in SDH mode as opposed to SONET mode.
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.It Dv UTP_ST_UNASS
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Interface is producing unassigned cells instead of idle cells.
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.It Dv UTP_ST_NOSCRAMB
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Cell scrambling is switched off.
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.It Dv UTP_ST_DETACH
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(Internal use.)
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Interface is currently detaching.
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.It Dv UTP_ST_ATTACHED
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The attach routine has been run successfully.
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.El
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.It Va carrier
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The carrier state of the interface.
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This field can have one of three values:
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.Bl -tag -width indent
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.It Dv UTP_CARR_UNKNOWN
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Carrier state is still unknown.
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.It Dv UTP_CARR_OK
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Carrier has been detected.
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.It Dv UTP_CARR_LOST
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Carrier has been lost.
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.El
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.It Va loopback
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This is the current loopback mode of the interface.
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Note that not all
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chips support all loopback modes.
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Refer to the chip documentation.
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The
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following modes may be supported:
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.Bl -tag -width indent
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.It Dv UTP_LOOP_NONE
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No loopback, normal operation.
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.It Dv UTP_LOOP_TIME
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Timing source loopback.
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The transmitter clock is driven by the receive clock.
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.It Dv UTP_LOOP_DIAG
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Diagnostic loopback.
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.It Dv UTP_LOOP_LINE
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Serial line loopback.
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.It Dv UTP_LOOP_PARAL
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Parallel diagnostic loopback.
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.It Dv UTP_LOOP_TWIST
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Twisted pair diagnostic loopback.
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.It Dv UTP_LOOP_PATH
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Diagnostic path loopback.
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.El
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.It Va chip
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This points to a function vector for chip specific functions.
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Two fields
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in this vector are publicly available:
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.Bl -tag -width indent
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.It Va type
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This is the type of the detected PHY chip.
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One of:
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.Pp
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.Bl -tag -width indent -compact
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.It Dv UTP_TYPE_UNKNOWN Pq No 0
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.It Dv UTP_TYPE_SUNI_LITE Pq No 1
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.It Dv UTP_TYPE_SUNI_ULTRA Pq No 2
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.It Dv UTP_TYPE_SUNI_622 Pq No 3
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.It Dv UTP_TYPE_IDT77105 Pq No 4
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.El
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.It Va name
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This is a string with the name of the PHY chip.
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.El
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.El
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.Pp
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The following functions are used by the driver during attach/detach and/or
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initialisation/stopping the interface:
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.Bl -tag -width indent
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.It Fn utopia_attach
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Attach the PHY chip.
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This is called with a preallocated
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.Vt "struct utopia"
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(which may be part of the driver's
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.Va softc ) .
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The module initializes all fields of the
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.Nm
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state and the media field.
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User settable flags should be set after the call to
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.Fn utopia_attach .
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This function may fail due to the inability to install the sysctl handlers.
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In this case it will return \-1.
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On success, 0 is returned and the
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.Dv UTP_ST_ATTACHED
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flag is set.
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.It Fn utopia_detach
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Remove the
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.Nm
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attachment from the system.
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This cancels all outstanding polling
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timeouts.
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.It Fn utopia_start
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Start operation of that PHY.
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This should be called at a time
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when the PHY registers are known to be accessible.
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This may be either in
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the driver's attach function or when the interface is set running.
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.It Fn utopia_stop
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Stop operation of the PHY attachment.
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This may be called either in the detach
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function of the driver or when the interface is brought down.
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.It Fn utopia_init_media
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This must be called if the media field in the ATM MIB was changed.
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The function
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makes sure, that the ifmedia fields contain the same information as the
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ATM MIB.
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.It Fn utopia_reset_media
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This may be called to remove all media information from the ifmedia field.
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.El
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.Pp
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The following functions can be used to modify the PHY state while the interface
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is running:
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.Bl -tag -width indent
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.It Fn utopia_reset
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Reset the operational parameters to the default state (SONET, idle cells,
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scrambling enabled).
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Returns 0 on success, an error code otherwise, leaving
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the state undefined.
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.It Fn utopia_set_sdh
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If the argument is zero the chip is switched to Sonet mode, if it is non-zero
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the chip is switched to SDH mode.
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Returns 0 on success, an error code otherwise,
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leaving the previous state.
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.It Fn utopia_set_unass
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If the argument is zero the chip is switched to produce idle cells, if it is
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non-zero the chip is switched to produce unassigned cells.
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Returns 0 on success,
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an error code otherwise, leaving the previous state.
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.It Fn utopia_set_noscramb
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If the argument is zero enables scrambling, if it is
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non-zero disables scrambling.
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Returns 0 on success,
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an error code otherwise, leaving the previous state.
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.It Fn utopia_update_carrier
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Check the carrier state and update the carrier field in the state structure.
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This will generate a message to the Netgraph stack if the carrier state changes.
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For chips that are polled this is called automatically, for interrupt
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driven attachments this must be called on interrupts from the PHY chip.
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.It Fn utopia_set_loopback
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Set the loopback mode of the chip.
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Returns 0 on success, an error code
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otherwise, leaving the previous state.
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.It Fn utopia_intr
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Called when an interrupt from the PHY chip is detected.
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This resets the
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interrupt state by reading all registers and, if the interrupt was from the
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RSOP, checks the carrier state.
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.It Fn utopia_update_stats
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Update the statistics with counters read from the chip.
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.El
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.Sh SEE ALSO
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.Xr utopia 4
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.Sh AUTHORS
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.An Harti Brandt Aq Mt harti@FreeBSD.org
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brooks