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| author | Chander Kashyap <chander.kashyap@linaro.org> | 2011-12-18 22:56:44 +0000 |
|---|---|---|
| committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2012-02-12 10:11:28 +0100 |
| commit | db68bc2c2de15c6e5066427a2e5024667d886b9a (patch) | |
| tree | 3313a4997fa793227485a1b26592a4b536dc12ca /arch/arm | |
| parent | e619a0de936f52b7d57dd56e05139cb474baa18c (diff) | |
| download | u-boot-imx-db68bc2c2de15c6e5066427a2e5024667d886b9a.zip u-boot-imx-db68bc2c2de15c6e5066427a2e5024667d886b9a.tar.gz u-boot-imx-db68bc2c2de15c6e5066427a2e5024667d886b9a.tar.bz2 | |
Exynos: Fix ARM Clock frequency calculation
Earliar ARM clock frequency was calculated by:
MOUTAPLL/(DIVAPLL + 1) which is actually returning SCLKAPLL.
It is fixed by calculating it as follows:
ARMCLK=MOUTCORE / (DIVCORE + 1) / (DIVCORE2 + 1)
Signed-off-by: Chander Kashyap <chander.kashyap@linaro.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/cpu/armv7/exynos/clock.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c index 64de262..0c199cd 100644 --- a/arch/arm/cpu/armv7/exynos/clock.c +++ b/arch/arm/cpu/armv7/exynos/clock.c @@ -102,17 +102,20 @@ static unsigned long exynos4_get_arm_clk(void) struct exynos4_clock *clk = (struct exynos4_clock *)samsung_get_base_clock(); unsigned long div; - unsigned long dout_apll; - unsigned int apll_ratio; + unsigned long armclk; + unsigned int core_ratio; + unsigned int core2_ratio; div = readl(&clk->div_cpu0); - /* APLL_RATIO: [26:24] */ - apll_ratio = (div >> 24) & 0x7; + /* CORE_RATIO: [2:0], CORE2_RATIO: [30:28] */ + core_ratio = (div >> 0) & 0x7; + core2_ratio = (div >> 28) & 0x7; - dout_apll = get_pll_clk(APLL) / (apll_ratio + 1); + armclk = get_pll_clk(APLL) / (core_ratio + 1); + armclk /= (core2_ratio + 1); - return dout_apll; + return armclk; } /* exynos4: return pwm clock frequency */ |