]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * include/asm-v850/v850e_utils.h -- Utility functions associated with | |
3 | * V850E CPUs | |
4 | * | |
5 | * Copyright (C) 2001,03 NEC Electronics Corporation | |
6 | * Copyright (C) 2001,03 Miles Bader <miles@gnu.org> | |
7 | * | |
8 | * This file is subject to the terms and conditions of the GNU General | |
9 | * Public License. See the file COPYING in the main directory of this | |
10 | * archive for more details. | |
11 | * | |
12 | * Written by Miles Bader <miles@gnu.org> | |
13 | */ | |
14 | ||
15 | #ifndef __V850_V850E_UTILS_H__ | |
16 | #define __V850_V850E_UTILS_H__ | |
17 | ||
18 | /* Calculate counter clock-divider and count values to attain the | |
19 | desired frequency RATE from the base frequency BASE_FREQ. The | |
20 | counter is expected to have a clock-divider, which can divide the | |
21 | system cpu clock by a power of two value from MIN_DIVLOG2 to | |
22 | MAX_DIV_LOG2, and a word-size of COUNTER_SIZE bits (the counter | |
23 | counts up and resets whenever it's equal to the compare register, | |
24 | generating an interrupt or whatever when it does so). The returned | |
25 | values are: *DIVLOG2 -- log2 of the desired clock divider and *COUNT | |
26 | -- the counter compare value to use. Returns true if it was possible | |
27 | to find a reasonable value, otherwise false (and the other return | |
28 | values will be set to be as good as possible). */ | |
29 | extern int calc_counter_params (unsigned long base_freq, | |
30 | unsigned long rate, | |
31 | unsigned min_divlog2, unsigned max_divlog2, | |
32 | unsigned counter_size, | |
33 | unsigned *divlog2, unsigned *count); | |
34 | ||
35 | #endif /* __V850_V850E_UTILS_H__ */ |