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UTOPIA(4)		 BSD Kernel Interfaces Manual		     UTOPIA(4)

     utopia -- Driver module for ATM PHY chips

     device utopia

     This module is used by all	ATM drivers for	cards that use PMC-Sierra
     S/Uni and IDT77105/IDT77155 chips to provide uniform functionality.  The
     module implements status monitoring in either interrupt or	polling	mode,
     media option handling and application access to chip registers.

     The driver	implements several sysctls that	accessible under the
     hw.atm.XXX	tree, where XXX	is the name of the ATM interface:

	  When reading this sysctl an array of 8-bit unsigned integers is re-
	  turned containing all	accessible chip	registers starting at register
	  0.  A	register can be	written	by writing three 8-bit unsigned	inte-
	  gers to the sysctl: the register number, the new value and a bit
	  mask.	 This changes all bits in the register for which the corre-
	  sponding bit in the mask is one to the bit values from value.	 Note,
	  that not all registers may be	writeable.

	  allows to put	the interface in one of	several	loopback modes.	 Not
	  all modes and	all combinations of modes are supported	on all chips.
	  The possible modes are:

	  UTP_LOOP_NONE	(0x00)
	       No loopback, normal operation.

	  UTP_LOOP_TIME	(0x01)
	       Timing source loopback. When this is set	the transmitter's
	       clock is	derived	from the receiver's clock.

	  UTP_LOOP_DIAG	(0x02)
	       Diagnostic loopback. In this mode the receiver's	input is con-
	       nected to the transmitter's output. The receiver	gets back ev-
	       erything	that is	sent. The transmitter operates normally.

	  UTP_LOOP_LINE	(0x04)
	       Serial line loopback. This connects the line receiver to	the
	       line transmitter.  The chip transmits all cells back that it
	       receives. The receiver operates normally.

	  UTP_LOOP_PARAL (0x08)
	       Parallel	diagnostic loopback. This feeds	back all transmitted
	       cells into the receiver between the parallel/serial converters.
	       The transmitter operates	normally.

	  UTP_LOOP_TWIST (0x10)
	       Twisted pair diagnostic loopback. Connects the high speed re-
	       ceive data to the high speed transmit data. All received	data
	       is sent back. The receiver operates normally.

	  UTP_LOOP_PATH	(0x20)
	       Diagnostic path loopback. This connectes	the receiver input to
	       the transmitter output just between the path overhead processor
	       and the byte mux. The transmitter operates normally.

	  This is the detected type of the phy chip. Currently the following
	  chips	are supported:

	       The module could	not determine the type of the PHY chip.

	       PMC-5346	(S/Uni-Lite)

	       PMC-5350	(S/Uni-Ultra)

	  UTP_TYPE_SUNI_622 (3)
	       PMC-5355	(S/Uni-622)

	  UTP_TYPE_IDT77105 (4)
	       IDT77105	(25.6MBit UTP interface)

	  UTP_TYPE_IDT77155 (5)
	       IDT77155	(155MBit interface)

	  This is a string describing the type of the PHY chip.

	  Physical and some ATM	layer statistics. These	are the	statistics
	  usually provided by the chip.	The data is a returned in the follow-
	  ing structure:

	  struct utopia_stats1 {
		  uint32_t version;	  /* version of	this struct */
		  uint32_t fill;
		  uint64_t rx_sbip;	  /* rx	section	BIP errors */
		  uint64_t rx_lbip;	  /* rx	line BIP errors	*/
		  uint64_t rx_lfebe;	  /* rx	line far end block errors */
		  uint64_t rx_pbip;	  /* rx	path BIP errors	*/
		  uint64_t rx_pfebe;	  /* rx	path far end block errors */
		  uint64_t rx_cells;	  /* received cells */
		  uint64_t rx_corr;	  /* correctable cell errors */
		  uint64_t rx_uncorr;	  /* uncorrectable cell	errors */
		  uint64_t rx_symerr;	  /* symbol errors */
		  uint64_t tx_cells;	  /* transmitted cells */

	  The current version is 1. The	statistics are updated from the	chip
	  once a second. On overflow the counters wrap to zero.	Note that not
	  all counters are meaningful for all PHY chips. The statistics	are
	  cleared by writing an	arbitrary new value (the value is ignored).

     The utopia	module also interfaces with the	ifmedia	system.	 The module
     reports the current state of the carrier and will issue a warning message
     when the carrier state changes.  While the	physical media itself cannot
     be	changed, several media options can:

     SDH  If the PHY is	a Sonet/SDH chip this flag switches the	interface into
	  SDH mode.  If	this option is not set (the default) the interface is
	  in Sonet mode.

	  If the PHY is	a Sonet/SDH chip disable scrambling.  This may be use-
	  ful for debugging purposes.

	  Normally the interface emits idle cells when there are no other
	  cells	to transmit. This changes the default cell type	to unassigned
	  cells. This may be needed for	interworking with public networks.

     en(4), fatm(4), hatm(4), patm(4), utopia(9)

     Harti Brandt <>.

FreeBSD				  May 8, 2003			       FreeBSD


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