commit: http://blackfin.uclinux.org/git/?p=u-boot;a=commitdiff;h=efaa56d984d6643069eed007f3852aebe9def11b branch: http://blackfin.uclinux.org/git/?p=u-boot;a=shortlog;h=refs/heads/2012R2
Signed-off-by: Sonic Zhang <sonic.zh...@analog.com> --- arch/blackfin/cpu/initcode.c | 7 +++---- arch/blackfin/include/asm/clock.h | 19 ++++++++----------- 2 files changed, 11 insertions(+), 15 deletions(-) diff --git a/arch/blackfin/cpu/initcode.c b/arch/blackfin/cpu/initcode.c index 848ae56..2173b6b 100644 --- a/arch/blackfin/cpu/initcode.c +++ b/arch/blackfin/cpu/initcode.c @@ -733,11 +733,10 @@ update_serial_clocks(ADI_BOOT_DATA *bs, uint sdivB, uint divB, uint vcoB) sdivR = bfin_read_PLL_DIV() & 0xf; vcoR = (bfin_read_PLL_CTL() >> 9) & 0x3f; #endif - int dividend = sdivB * divB * vcoR; - int divisor = vcoB * sdivR; + unsigned int dividend = sdivB * divB * vcoR; + unsigned int divisor = vcoB * sdivR; unsigned int quotient; - for (quotient = 0; dividend > 0; ++quotient) - dividend -= divisor; + quotient = early_division(dividend, divisor); serial_early_put_div(quotient - ANOMALY_05000230); serial_putc('c'); } diff --git a/arch/blackfin/include/asm/clock.h b/arch/blackfin/include/asm/clock.h index dea324f..f1fcd40 100644 --- a/arch/blackfin/include/asm/clock.h +++ b/arch/blackfin/include/asm/clock.h @@ -24,21 +24,18 @@ __attribute__((always_inline)) static inline uint32_t early_division(uint32_t dividend, uint32_t divisor) { uint32_t quotient; - uint32_t i; + uint32_t i, j; - for (i = 0; i < 5; i++) { - if (divisor == (1 << i)) { - quotient = dividend >> i; - return quotient; + for (quotient = 1, i = 1; dividend > divisor; ++i) { + j = divisor << i; + if (j > dividend || (j & 0x80000000)) { + --i; + quotient += (1 << i); + dividend -= (divisor << i); + i = 0; } } - if (divisor) { - for (quotient = 0; dividend >= divisor; ++quotient) - dividend -= divisor; - } else - quotient = dividend; - return quotient; }
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