mk48txx man page on NetBSD

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MK48TXX(4)		 BSD Kernel Interfaces Manual		    MK48TXX(4)

NAME
     mk48txx — Mostek time-of-day clock driver

SYNOPSIS
     #include <dev/ic/mk48txxreg.h>
     #include <dev/ic/mk48txxvar.h>
     define mk48txx
     file   dev/ic/mk48txx.c	mk48txx

DESCRIPTION
     The mk48txx driver provides access to several models of Mostek time-of-
     day clock chips.  Access methods to retrieve and set date and time are
     provided through the TODR interface defined in todr(9).

     To tie an instance of this device to the system, use the mk48txx_attach()
     function and the mk48txx_softc structure defined as follows:

     void mk48txx_attach(struct mk48txx_softc *)

     typedef uint8_t (*mk48txx_nvrd_t)(struct mk48txx_softc *, int off);
     typedef void (*mk48txx_nvwr_t)(struct mk48txx_softc *, int off,
	 uint8_t datum);

     struct mk48txx_softc {
	     struct device   sc_dev;
	     bus_space_tag_t sc_bst;
	     bus_space_handle_t sc_bsh;
	     struct todr_chip_handle sc_handle;
	     const char	     *sc_model;
	     bus_size_t	     sc_nvramsz;
	     bus_size_t	     sc_clkoffset;
	     u_int	     sc_year0;
	     u_int	     sc_flag;
	     mk48txx_nvrd_t  sc_nvrd;
	     mk48txx_nvwr_t  sc_nvwr;
     };

	   sc_bst

	   sc_bsh	 Specify bus space access to the chip's non-volatile
			 memory (including the clock registers).

	   sc_handle	 TODR handle passed to the todr_attach() function to
			 register todr(9) interface.

	   sc_model	 The chip model which this instance should serve.
			 Must be one of “mk48t02”, “mk48t08”, “mk48t18”, or
			 “mk48t59”.

	   sc_nvramsz	 Size of non-volatile RAM in the Mostek chip.  This
			 value is set by mk48txx_attach().

	   sc_clkoffset	 Offset into the control registers of the Mostek chip.
			 This value is set by mk48txx_attach().

	   sc_year0	 The actual year represented by the clock's ‘year’
			 counter.  This is generally dependent on the system
			 configuration in which the clock device is mounted.
			 For instance, on Sun Microsystems machines the con‐
			 vention is to have clock's two-digit year represent
			 the year 1968.

	   sc_flag	 This flag is used to specify machine-dependent fea‐
			 tures.

	   sc_nvread

	   sc_nvwrite	 Specify alternate access methods for reading resp.
			 writing clock device registers.  The default, when
			 NULL is passed as an access method, is to access the
			 chip memory (and clock registers) as if they were
			 direct-mapped with using the specified bus space.

			 Otherwise, the driver will call the respective func‐
			 tion to perform the access, passing it the specified
			 bus space and the offset off of the chip memory (or
			 clock register) location to be read from or written
			 to, respectively.

     Note that if the resulting date retrieved with the todr_gettime() method
     is earlier that January 1, 1970, the driver will assume that the chip's
     year counter actually represents a year in the 21st century.  This behav‐
     iour can be overridden by setting the MK48TXX_NO_CENT_ADJUST flag in
     sc_flag.

HARDWARE
     The following models are supported:

	   Mostek MK48T02
	   Mostek MK48T08
	   Mostek MK48T18
	   Mostek MK48T59

SEE ALSO
     intro(4), todr(9)

HISTORY
     The mk48txx driver first appeared in NetBSD 1.5.

AUTHORS
     The mk48txx driver was written by Paul Kranenburg ⟨pk@NetBSD.org⟩.

BSD				October 1, 2006				   BSD
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