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.\" Copyright (c) 1998, Nicolas Souchu
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\"
.Dd April 5, 1998
.Dt PPBCONF 9
.Os FreeBSD
.Sh NAME
.Nm ppbconf
.Nd
ppbus developer's guide
.Sh SYNOPSIS
.Fd "#include <dev/ppbus/ppbconf.h>"
.Sh DESCRIPTION
See
.Xr ppbus 4
for ppbus description.
.Sh PPBUS STRUCTURES
Each ppbus layer
.Po
.Em adapter ,
.Em ppbus
and
.Em device
.Pc
is described by one or more C structure.
.Ss The adapter layer
.Bd -literal
struct ppb_adapter {
void (*intr_handler)(int);
void (*reset_epp_timeout)(int);
void (*ecp_sync)(int);
int (*exec_microseq)(int, struct ppb_microseq *, int *);
int (*setmode)(int, int);
void (*outsb_epp)(int, char *, int);
void (*outsw_epp)(int, char *, int);
void (*outsl_epp)(int, char *, int);
void (*insb_epp)(int, char *, int);
void (*insw_epp)(int, char *, int);
void (*insl_epp)(int, char *, int);
char (*r_dtr)(int);
char (*r_str)(int);
char (*r_ctr)(int);
char (*r_epp)(int);
char (*r_ecr)(int);
char (*r_fifo)(int);
void (*w_dtr)(int, char);
void (*w_str)(int, char);
void (*w_ctr)(int, char);
void (*w_epp)(int, char);
void (*w_ecr)(int, char);
void (*w_fifo)(int, char);
};
.Ed
.Pp
This structure is the interface between
.Xr ppc 4
layer and upper ppbus system levels. For each ppc device, this
structure is filled with generic i/o functions that may be redefined if
needed for particular chipsets.
.Pp
Developers are really encouraged to use the
exec_microseq entry to avoid indirect function call overhead. See
.Xr microseq 9
for more info.
.Ss The ppbus layer
.Bd -literal
struct ppb_driver
{
struct ppb_device *(*probe)(struct ppb_data *ppb);
int (*attach)(struct ppb_device *pdp);
char *name;
};
.Ed
.Bd -literal
struct ppb_data {
#define PPB_PnP_PRINTER 0
#define PPB_PnP_MODEM 1
#define PPB_PnP_NET 2
#define PPB_PnP_HDC 3
#define PPB_PnP_PCMCIA 4
#define PPB_PnP_MEDIA 5
#define PPB_PnP_FDC 6
#define PPB_PnP_PORTS 7
#define PPB_PnP_SCANNER 8
#define PPB_PnP_DIGICAM 9
#define PPB_PnP_UNKNOWN 10
int class_id; /* not a PnP device if class_id < 0 */
ushort mode; /* IEEE 1284-1994 mode
* NIBBLE, PS2, EPP, ECP */
ushort avm; /* IEEE 1284-1994 available
* modes */
struct ppb_link *ppb_link; /* link to the adapter */
struct ppb_device *ppb_owner; /* device which owns the bus */
LIST_HEAD(, ppb_device) ppb_devs; /* list of devices on the bus */
LIST_ENTRY(ppb_data) ppb_chain; /* list of busses */
};
.Ed
.Ss The device layer
.Bd -literal
/* microseqences used for GET/PUT operations */
struct ppb_xfer {
struct ppb_microseq *prolog; /* loop prologue */
struct ppb_microseq *body; /* loop body */
struct ppb_microseq *epilog; /* loop epilogue */
};
.Ed
.Bd -literal
struct ppb_context {
int valid; /* 1 if the struct is valid */
int mode; /* operating mode */
struct microseq *curpc; /* pc in curmsq */
struct microseq *curmsq; /* currently executed microseq */
};
.Ed
.Bd -literal
struct ppb_device {
int id_unit; /* unit of the device */
char *name; /* name of the device */
ushort mode; /* current mode of the device */
ushort avm; /* available modes of the device */
struct ppb_context ctx; /* context of the device */
/* mode dependent get msq. If NULL,
* IEEE1284 code is used */
struct ppb_xfer
get_xfer[PPB_MAX_XFER];
/* mode dependent put msq. If NULL,
* IEEE1284 code is used */
struct ppb_xfer
put_xfer[PPB_MAX_XFER];
void (*intr)(int); /* interrupt handler */
struct ppb_data *ppb; /* link to the ppbus */
LIST_ENTRY(ppb_device) chain; /* list of devices on the bus */
};
.Ed
.Ss Linking these structures all together
.Bd -literal
struct ppb_link {
int adapter_unit; /* unit of the adapter */
int base; /* base address of the port */
int id_irq; /* != 0 if irq enabled */
#define EPP_1_9 0x0 /* default */
#define EPP_1_7 0x1
int epp_protocol; /* EPP protocol: 0=1.9, 1=1.7 */
struct ppb_adapter *adapter; /* link to the ppc adapter */
struct ppb_data *ppbus; /* link to the ppbus */
};
.Ed
.Sh EXAMPLE
See vpo.c source file.
.Sh SEE ALSO
.Xr ppbus 4 ,
.Xr ppi 4 ,
.Xr microseq 9
.Sh HISTORY
The
.Nm
manual page first appeared in
.Fx 3.0 .
.Sh AUTHOR
This
manual page was written by
.An Nicolas Souchu .
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