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Diffstat (limited to 'include/asm-v850/v850e_utils.h')
| -rw-r--r-- | include/asm-v850/v850e_utils.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/include/asm-v850/v850e_utils.h b/include/asm-v850/v850e_utils.h new file mode 100644 index 000000000000..52eb72822d3d --- /dev/null +++ b/include/asm-v850/v850e_utils.h @@ -0,0 +1,35 @@ +/* + * 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__ */ |