NAME
intersil7170 —
Intersil ICM7170
time-of-day clock driver
SYNOPSIS
#include <dev/ic/intersil7170reg.h>
#include <dev/ic/intersil7170var.h>
define intersil7170
file dev/ic/intersil7170.c intersil7170
DESCRIPTION
The
intersil7170 driver provides access to the Intersil
ICM7170 time-of-day clock chip. 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
intersil7170_attach() function and the
intersil7170_softc structure defined as follows:
void
intersil7170_attach(
struct
intersil7170_softc *)
struct intersil7170_softc {
struct device sc_dev;
bus_space_tag_t sc_bst;
bus_space_handle_t sc_bsh;
struct todr_chip_handle sc_handle;
u_int sc_year0;
u_int sc_flag;
};
-
-
- bus_tag
-
- bus_handle
- 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_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 convention is to have clock's two-digit year
represent the year 1968.
-
-
- sc_flag
- This flag is used to specify machine-dependent
features.
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 behaviour can be
overridden by setting the
INTERSIL7170_NO_CENT_ADJUST
flag in
sc_flag.
SEE ALSO
intro(4),
todr(9)
HISTORY
The
intersil7170 driver first appeared in
NetBSD 1.5.
AUTHORS
The
intersil7170 driver was written by
Paul
Kranenburg ⟨pk@NetBSD.org⟩.