Intel Intel NetStructure Single Board Computer, MPCBL0010 12.4.15 Read the Current Reference Clock, 12.4.16 sysfs Interface

Intel NetStructure® MPCBL0010 Single Board Computer
October 2006 Technical Product Specification
Order Number: 304120 169
Telecom Clock—MPCBL0010 SBC
12.4.15 Read the Current Reference Clock
To determine the current reference clock used by the telecom clock, use the following:
Function:
IOCTL_READ_CURRENT_REF
12.4.16 sysfs Interface
When the Telecom Clock driver is loaded, it creates a sysfs directory under /sys/
devices/platform/telco_clock.
This directory exports the following interfaces as shown in Table138 where they are
mapped to Telecom Clock API functions. (See Section12.4, “Telecom Clock API” for
information about using the Telecom Clock API.)
Note: All sysfs interfaces are integers in hex format, i.e., echo 99 > refalign has the same effect as echo 0x99
Table 137. Reference Clock Values
Current Reference Clock Value
Primary Clock 0
Secondary Clock q
Table 138. Telecom Clock API Function Mapping for the sysfs Interface
sysfs Interface Name (File Name) Telecom Clock API Function Name
alarms IOCTL_READ_ALARMS
current_ref IOCTL_READ_CURRENT_REF
received_ref_clk3a IOCTL_SELECT_RECEIVED_REF_CLK3A
received_ref_clk3b IOCTL_SELECT_RECEIVED_REF_CLK3B
enable_clk3a_output IOCTL_ENABLE_CLK3A_OUTPUT
enable_clk3b_output IOCTL_ENABLE_CLK3B_OUTPUT
enable_clka0_output IOCTL_ENABLE_CLKA0_OUTPUT
enable_clka1_output IOCTL_ENABLE_CLKA1_OUTPUT
enable_clkb0_output IOCTL_ENABLE_CLKB0_OUTPUT
enable_clkb1_output IOCTL_ENABLE_CLKB1_OUTPUT
filter_select IOCTL_FILTER_SELECT
hardware_switching IOCTL_HARDWARE_SWITCHING
hardware_switching_mode IOCTL_HARDWARE_SWITCHING_MODE
telclock_version -
mode_select IOCTL_MODE_SELECT
refalign IOCTL_REFALIGN
reset IOCTL_RESET
select_amcb1_transmit_clock IOCTL_SELECT_AMCB1_TRANSMIT_CLOCK
select_amcb2_transmit_clock IOCTL_SELECT_AMCB2_TRANSMIT_CLOCK
select_redundant_clock IOCTL_SELECT_REDUNDANT_CLOCK
select_ref_frequency IOCTL_SELECT_REF_FREQUENCY