diff options
author | Roman Yeryomin <roman@advem.lv> | 2012-09-13 00:40:35 +0300 |
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committer | Roman Yeryomin <roman@advem.lv> | 2012-12-03 00:13:21 +0200 |
commit | 5deb3317cb51ac52de922bb55f8492624018906d (patch) | |
tree | c2fbe6346699d9bb0f2100490c3029519bb8fde8 /target/linux/realtek/files/arch/rlx/lib/delay.c | |
parent | 0239d37124f9184b478a42de8a7fa1bc85a6a6fe (diff) |
Add realtek target files
Signed-off-by: Roman Yeryomin <roman@advem.lv>
Diffstat (limited to 'target/linux/realtek/files/arch/rlx/lib/delay.c')
-rw-r--r-- | target/linux/realtek/files/arch/rlx/lib/delay.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/target/linux/realtek/files/arch/rlx/lib/delay.c b/target/linux/realtek/files/arch/rlx/lib/delay.c new file mode 100644 index 000000000..34d5d970a --- /dev/null +++ b/target/linux/realtek/files/arch/rlx/lib/delay.c @@ -0,0 +1,55 @@ +/* + * 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. + * + * Copyright (C) 1994 by Waldorf Electronics + * Copyright (C) 1995 - 2000, 01, 03 by Ralf Baechle + * Copyright (C) 1999, 2000 Silicon Graphics, Inc. + * Copyright (C) 2007 Maciej W. Rozycki + */ +#include <linux/module.h> +#include <linux/param.h> +#include <linux/smp.h> + +#include <asm/compiler.h> + +inline void __delay(unsigned int loops) +{ + __asm__ __volatile__ ( + " .set noreorder \n" + " .align 3 \n" + "1: bnez %0, 1b \n" + " subu %0, 1 \n" + " .set reorder \n" + : "=r" (loops) + : "0" (loops)); +} +EXPORT_SYMBOL(__delay); + +/* + * Division by multiplication: you don't have to worry about + * loss of precision. + * + * Use only for very small delays ( < 1 msec). Should probably use a + * lookup table, really, as the multiplications take much too long with + * short delays. This is a "reasonable" implementation, though (and the + * first constant multiplications gets optimized away if the delay is + * a constant) + */ + +void __udelay(unsigned long us) +{ + unsigned int lpj = current_cpu_data.udelay_val; + + __delay((us * 0x000010c7ull * HZ * lpj) >> 32); +} +EXPORT_SYMBOL(__udelay); + +void __ndelay(unsigned long ns) +{ + unsigned int lpj = current_cpu_data.udelay_val; + + __delay((ns * 0x00000005ull * HZ * lpj) >> 32); +} +EXPORT_SYMBOL(__ndelay); |