diff options
Diffstat (limited to 'drivers/media/video/samsung/mali/common/mali_osk_bitops.h')
| -rw-r--r-- | drivers/media/video/samsung/mali/common/mali_osk_bitops.h | 166 |
1 files changed, 0 insertions, 166 deletions
diff --git a/drivers/media/video/samsung/mali/common/mali_osk_bitops.h b/drivers/media/video/samsung/mali/common/mali_osk_bitops.h deleted file mode 100644 index ada1488..0000000 --- a/drivers/media/video/samsung/mali/common/mali_osk_bitops.h +++ /dev/null @@ -1,166 +0,0 @@ -/* - * Copyright (C) 2010, 2012 ARM Limited. All rights reserved. - * - * This program is free software and is provided to you under the terms of the GNU General Public License version 2 - * as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence. - * - * A copy of the licence is included with the program, and can also be obtained from Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. - */ - -/** - * @file mali_osk_bitops.h - * Implementation of the OS abstraction layer for the kernel device driver - */ - -#ifndef __MALI_OSK_BITOPS_H__ -#define __MALI_OSK_BITOPS_H__ - -#ifdef __cplusplus -extern "C" -{ -#endif - -MALI_STATIC_INLINE void _mali_internal_clear_bit( u32 bit, u32 *addr ) -{ - MALI_DEBUG_ASSERT( bit < 32 ); - MALI_DEBUG_ASSERT( NULL != addr ); - - (*addr) &= ~(1 << bit); -} - -MALI_STATIC_INLINE void _mali_internal_set_bit( u32 bit, u32 *addr ) -{ - MALI_DEBUG_ASSERT( bit < 32 ); - MALI_DEBUG_ASSERT( NULL != addr ); - - (*addr) |= (1 << bit); -} - -MALI_STATIC_INLINE u32 _mali_internal_test_bit( u32 bit, u32 value ) -{ - MALI_DEBUG_ASSERT( bit < 32 ); - return value & (1 << bit); -} - -MALI_STATIC_INLINE int _mali_internal_find_first_zero_bit( u32 value ) -{ - u32 inverted; - u32 negated; - u32 isolated; - u32 leading_zeros; - - /* Begin with xxx...x0yyy...y, where ys are 1, number of ys is in range 0..31 */ - inverted = ~value; /* zzz...z1000...0 */ - /* Using count_trailing_zeros on inverted value - - * See ARM System Developers Guide for details of count_trailing_zeros */ - - /* Isolate the zero: it is preceeded by a run of 1s, so add 1 to it */ - negated = (u32)-inverted ; /* -a == ~a + 1 (mod 2^n) for n-bit numbers */ - /* negated = xxx...x1000...0 */ - - isolated = negated & inverted ; /* xxx...x1000...0 & zzz...z1000...0, zs are ~xs */ - /* And so the first zero bit is in the same position as the 1 == number of 1s that preceeded it - * Note that the output is zero if value was all 1s */ - - leading_zeros = _mali_osk_clz( isolated ); - - return 31 - leading_zeros; -} - - -/** @defgroup _mali_osk_bitops OSK Non-atomic Bit-operations - * @{ */ - -/** - * These bit-operations do not work atomically, and so locks must be used if - * atomicity is required. - * - * Reference implementations for Little Endian are provided, and so it should - * not normally be necessary to re-implement these. Efficient bit-twiddling - * techniques are used where possible, implemented in portable C. - * - * Note that these reference implementations rely on _mali_osk_clz() being - * implemented. - */ - -/** @brief Clear a bit in a sequence of 32-bit words - * @param nr bit number to clear, starting from the (Little-endian) least - * significant bit - * @param addr starting point for counting. - */ -MALI_STATIC_INLINE void _mali_osk_clear_nonatomic_bit( u32 nr, u32 *addr ) -{ - addr += nr >> 5; /* find the correct word */ - nr = nr & ((1 << 5)-1); /* The bit number within the word */ - - _mali_internal_clear_bit( nr, addr ); -} - -/** @brief Set a bit in a sequence of 32-bit words - * @param nr bit number to set, starting from the (Little-endian) least - * significant bit - * @param addr starting point for counting. - */ -MALI_STATIC_INLINE void _mali_osk_set_nonatomic_bit( u32 nr, u32 *addr ) -{ - addr += nr >> 5; /* find the correct word */ - nr = nr & ((1 << 5)-1); /* The bit number within the word */ - - _mali_internal_set_bit( nr, addr ); -} - -/** @brief Test a bit in a sequence of 32-bit words - * @param nr bit number to test, starting from the (Little-endian) least - * significant bit - * @param addr starting point for counting. - * @return zero if bit was clear, non-zero if set. Do not rely on the return - * value being related to the actual word under test. - */ -MALI_STATIC_INLINE u32 _mali_osk_test_bit( u32 nr, u32 *addr ) -{ - addr += nr >> 5; /* find the correct word */ - nr = nr & ((1 << 5)-1); /* The bit number within the word */ - - return _mali_internal_test_bit( nr, *addr ); -} - -/* Return maxbit if not found */ -/** @brief Find the first zero bit in a sequence of 32-bit words - * @param addr starting point for search. - * @param maxbit the maximum number of bits to search - * @return the number of the first zero bit found, or maxbit if none were found - * in the specified range. - */ -MALI_STATIC_INLINE u32 _mali_osk_find_first_zero_bit( const u32 *addr, u32 maxbit ) -{ - u32 total; - - for ( total = 0; total < maxbit; total += 32, ++addr ) - { - int result; - result = _mali_internal_find_first_zero_bit( *addr ); - - /* non-negative signifies the bit was found */ - if ( result >= 0 ) - { - total += (u32)result; - break; - } - } - - /* Now check if we reached maxbit or above */ - if ( total >= maxbit ) - { - total = maxbit; - } - - return total; /* either the found bit nr, or maxbit if not found */ -} -/** @} */ /* end group _mali_osk_bitops */ - -#ifdef __cplusplus -} -#endif - -#endif /* __MALI_OSK_BITOPS_H__ */ |