atppc(4) [netbsd man page]

ATPPC(4)						   BSD Kernel Interfaces Manual 						  ATPPC(4)

NAME

     atppc -- driver for AT-style parallel port chip sets

SYNOPSIS

     atppc* at acpi?
     atppc* at isa? port 0x378 irq 7 drq 3 flags 0x00
     atppc* at isapnp?
     atppc* at ofisa?
     atppc* at pnpbios? index ?
     atppc* at puc? port ?
     options ATPPC_VERBOSE
     options ATPPC_DEBUG

DESCRIPTION

     atppc supports parallel ports and provides the low level support needed by higher level drivers such as ppbus(4).	This driver attaches where
     the traditional NetBSD lpt(4) driver would ordinarily.  It provides the data transport and chip set manipulation needed by higher driver lay-
     ers, such as ppbus(4) and lpt(4).	This driver is designed to be one of many possible implementations supporting machine independent parallel
     device support via ppbus(4).

   IEEE 1284 support
     atppc is intended to provide to data-link like services to higher level IEEE 1284 device drivers (such as ppbus(4)).  atppc does not directly
     support IEEE 1284 features such as mode negotiation but rather provides the necessary infrastructure to allow a higher level driver to pro-
     vide these services.

     atppc does provide chip set manipulation, device handshakes (where appropriate), low-level error detection, and data transfer.

   Supported data transfer modes
     atppc supports the following data transfer modes: Centronics Compatible (Standard), Nibble, Byte (PS2), Fast Centronics, ECP, and EPP.  Stan-
     dard and Fast Centronics modes are write only, Nibble and Byte modes are read only, and ECP and EPP modes are bidirectional.

SEE ALSO

     acpi(4), i386/pnpbios(4), isa(4), isapnp(4), lpt(4), ofisa(4), ppbus(4), puc(4)

HISTORY

     The atppc driver is based on the ppc driver, which originally appeared in FreeBSD.  The driver was ported over in NetBSD 2.0.

AUTHORS

     This manual page is based on the FreeBSD ppc manual page.	The information has been updated for the NetBSD port by Gary Thorpe.

BUGS

     The FreeBSD driver includes support for some specific chip sets, specifically detection of some non-standard device I/O locations on the ISA
     bus.  This support was not ported over to the NetBSD version of the driver yet.

BSD
								 January 30, 2004							       BSD

PPC(4)							   BSD Kernel Interfaces Manual 						    PPC(4)

NAME

     ppc -- Parallel Port Chipset driver

SYNOPSIS

     device ppc

     In /boot/device.hints:
     hint.ppc.0.at="isa"
     hint.ppc.0.irq="7"

     For one or more PPBUS busses:
     device ppbus

DESCRIPTION

     The ppc driver provides low level support to various parallel port chipsets for the ppbus(4) system.

     During the probe phase, ppc detects parallel port chipsets and initializes private data according to their operating mode: COMPATIBLE, NIB-
     BLE, PS/2, EPP, ECP and other mixed modes.  If a mode is provided at startup through the flags variable of the boot interface, the operating
     mode of the chipset is forced according to flags and the hardware supported modes.

     During the attach phase, ppc allocates a ppbus structure, initializes it and calls the ppbus attach function.

   Supported flags
	   bits 0-3: chipset forced mode(s)

	   PPB_COMPATIBLE  0x0	   /* Centronics compatible mode */
	   PPB_NIBBLE	   0x1	   /* reverse 4 bit mode */
	   PPB_PS2	   0x2	   /* PS/2 byte mode */
	   PPB_EPP	   0x4	   /* EPP mode, 32 bit */
	   PPB_ECP	   0x8	   /* ECP mode */

	   And any mixed values.

	   bit 4: EPP protocol (0 EPP 1.9, 1 EPP 1.7)

	   bit 5: activate IRQ (1 IRQ disabled, 0 IRQ enabled)

	   bit 6: disable chipset specific detection

	   bit 7: disable FIFO detection

   Supported chipsets
     Some parallel port chipsets are explicitly supported: detection and initialisation code has been written according to their datasheets.

	   o   SMC FDC37C665GT and FDC37C666GT chipsets

	   o   Natsemi PC873xx-family (PC87332 and PC87306)

	   o   Winbond W83877xx-family (W83877F and W83877AF)

	   o   SMC-like chipsets with mixed modes (see ppbus(4))

   Adding support to a new chipset
     You may want to add support for the newest chipset your motherboard was sold with.  For the ISA bus, just retrieve the specs of the chipset
     and write the corresponding ppc_mychipset_detect() function.  Then add an entry to the general purpose ppc_detect() function.

     Your ppc_mychipset_detect() function should ensure that if the mode field of the flags boot variable is not null, then the operating mode is
     forced to the given mode and no other mode is available and ppb->ppb_avm field contains the available modes of the chipset.

SEE ALSO

     ppbus(4), ppi(4), device.hints(5)

HISTORY

     The ppc manual page first appeared in FreeBSD 3.0.

AUTHORS

     This manual page was written by Nicolas Souchu.

BUGS

     The chipset detection process may corrupt your chipset configuration.  You may disable chipset specific detection by using the above flags.

BSD
								   March 5, 1998							       BSD