/* * include/asm-v850/v850e_utils.h -- Utility functions associated with * V850E CPUs * * Copyright (C) 2001,03 NEC Electronics Corporation * Copyright (C) 2001,03 Miles Bader <miles@gnu.org> * * This file is subject to the terms and conditions of the GNU General * Public License. See the file COPYING in the main directory of this * archive for more details. * * Written by Miles Bader <miles@gnu.org> */ #ifndef __V850_V850E_UTILS_H__ #define __V850_V850E_UTILS_H__ /* Calculate counter clock-divider and count values to attain the desired frequency RATE from the base frequency BASE_FREQ. The counter is expected to have a clock-divider, which can divide the system cpu clock by a power of two value from MIN_DIVLOG2 to MAX_DIV_LOG2, and a word-size of COUNTER_SIZE bits (the counter counts up and resets whenever it's equal to the compare register, generating an interrupt or whatever when it does so). The returned values are: *DIVLOG2 -- log2 of the desired clock divider and *COUNT -- the counter compare value to use. Returns true if it was possible to find a reasonable value, otherwise false (and the other return values will be set to be as good as possible). */ extern int calc_counter_params (unsigned long base_freq, unsigned long rate, unsigned min_divlog2, unsigned max_divlog2, unsigned counter_size, unsigned *divlog2, unsigned *count); #endif /* __V850_V850E_UTILS_H__ */