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author | Aneesh V <aneesh@ti.com> | 2011-06-16 23:30:47 (GMT) |
---|---|---|
committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2011-07-04 08:55:25 (GMT) |
commit | 2c451f7831208741d0ff7ca6046cffcd9ee49def (patch) | |
tree | ec885d6ce9bc97eca3128e83e9af35c5b063ffe1 /arch/arm/include/asm/utils.h | |
parent | 4c93da7c392737f2036130c240e2b4bea773d703 (diff) | |
download | u-boot-2c451f7831208741d0ff7ca6046cffcd9ee49def.tar.xz |
armv7: cache maintenance operations for armv7
- Add a framework for layered cache maintenance
- separate out SOC specific outer cache maintenance from
maintenance of caches known to CPU
- Add generic ARMv7 cache maintenance operations that affect all
caches known to ARMv7 CPUs. For instance in Cortex-A8 these
opertions will affect both L1 and L2 caches. In Cortex-A9
these will affect only L1 cache
- D-cache operations supported:
- Invalidate entire D-cache
- Invalidate D-cache range
- Flush(clean & invalidate) entire D-cache
- Flush D-cache range
- I-cache operations supported:
- Invalidate entire I-cache
- Add maintenance functions for TLB, branch predictor array etc.
- Enable -march=armv7-a so that armv7 assembly instructions can be
used
Signed-off-by: Aneesh V <aneesh@ti.com>
Diffstat (limited to 'arch/arm/include/asm/utils.h')
-rw-r--r-- | arch/arm/include/asm/utils.h | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/arch/arm/include/asm/utils.h b/arch/arm/include/asm/utils.h new file mode 100644 index 0000000..828b86c --- /dev/null +++ b/arch/arm/include/asm/utils.h @@ -0,0 +1,56 @@ +/* + * (C) Copyright 2010 + * Texas Instruments, <www.ti.com> + * Aneesh V <aneesh@ti.com> + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ +#ifndef _UTILS_H_ +#define _UTILS_H_ + +static inline s32 log_2_n_round_up(u32 n) +{ + s32 log2n = -1; + u32 temp = n; + + while (temp) { + log2n++; + temp >>= 1; + } + + if (n & (n - 1)) + return log2n + 1; /* not power of 2 - round up */ + else + return log2n; /* power of 2 */ +} + +static inline s32 log_2_n_round_down(u32 n) +{ + s32 log2n = -1; + u32 temp = n; + + while (temp) { + log2n++; + temp >>= 1; + } + + return log2n; +} + +#endif |