PCI1760_PWM_TIMEBASE
divisor = DIV_ROUND_CLOSEST(ns, PCI1760_PWM_TIMEBASE);
divisor = DIV_ROUND_UP(ns, PCI1760_PWM_TIMEBASE);
divisor = ns / PCI1760_PWM_TIMEBASE;
if ((hi_div * PCI1760_PWM_TIMEBASE) != data[2] ||
(lo_div * PCI1760_PWM_TIMEBASE) != data[4]) {
data[2] = hi_div * PCI1760_PWM_TIMEBASE;
data[4] = lo_div * PCI1760_PWM_TIMEBASE;
data[1] = hi_div * PCI1760_PWM_TIMEBASE;
data[2] = lo_div * PCI1760_PWM_TIMEBASE;