[U-Boot] [PATCH] arm: exynos: fix clock calculation

Minkyu Kang
2013-07-05T10:13:42Z

There are differnce with clock calcuation by cpu variations.
This patch will fix it according to user manual.

Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
---
arch/arm/cpu/armv7/exynos/clock.c | 37 +++++++++++++++++++++++++++++++++----
1 file changed, 33 insertions(+), 4 deletions(-)

diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c
index e1c4246..da43373 100644
--- a/arch/arm/cpu/armv7/exynos/clock.c
+++ b/arch/arm/cpu/armv7/exynos/clock.c
@@ -85,6 +85,7 @@ static struct set_epll_con_val exynos5_epll_div[] = {
static int exynos_get_pll_clk(int pllreg, unsigned int r, unsigned int k)
{
unsigned long m, p, s = 0, mask, fout;
+ unsigned int div;
unsigned int freq;
/*
* APLL_CON: MIDV [25:16]
@@ -113,11 +114,39 @@ static int exynos_get_pll_clk(int pllreg, unsigned int r, unsigned int k)
fout = (m + k / 65536) * (freq / (p * (1 << s)));
} else if (pllreg == VPLL) {
k = k & 0xfff;
- /* FOUT = (MDIV + K / 1024) * FIN / (PDIV * 2^SDIV) */
- fout = (m + k / 1024) * (freq / (p * (1 << s)));
+
+ /*
+ * Exynos4210
+ * FOUT = (MDIV + K / 1024) * FIN / (PDIV * 2^SDIV)
+ *
+ * Exynos4412
+ * FOUT = (MDIV + K / 65535) * FIN / (PDIV * 2^SDIV)
+ *
+ * Exynos5250
+ * FOUT = (MDIV + K / 65536) * FIN / (PDIV * 2^SDIV)
+ */
+ if (proid_is_exynos4210())
+ div = 1024;
+ else if (proid_is_exynos4412())
+ div = 65535;
+ else if (proid_is_exynos5250())
+ div = 65536;
+ else
+ return 0;
+
+ fout = (m + k / div) * (freq / (p * (1 << s)));
} else {
- /* FOUT = MDIV * FIN / (PDIV * 2^SDIV) */
- fout = m * (freq / (p * (1 << s)));
+ /*
+ * Exynos4210
+ * FOUT = MDIV * FIN / (PDIV * 2^SDIV)
+ *
+ * Exynos4412 / Exynos5250
+ * FOUT = MDIV * FIN / (PDIV * 2^(SDIV-1))
+ */
+ if (proid_is_exynos4210())
+ fout = m * (freq / (p * (1 << s)));
+ else
+ fout = m * (freq / (p * (1 << (s - 1))));
}

return fout;
--
1.7.9.5

--
Thanks,
Minkyu Kang.