diff options
| author | Minkyu Kang <mk7.kang@samsung.com> | 2013-07-05 10:08:33 (GMT) |
|---|---|---|
| committer | Minkyu Kang <mk7.kang@samsung.com> | 2013-07-09 07:15:30 (GMT) |
| commit | e161f60f4df044e1815f4639795fce13f7b3bee3 (patch) | |
| tree | 4c97160601382c2aa95a78372e4a10d1cd16ae50 /arch | |
| parent | 9dfa3d0734df4aad107def2c900d1514ac7510ac (diff) | |
| download | u-boot-e161f60f4df044e1815f4639795fce13f7b3bee3.tar.xz | |
arm: exynos: fix clock calculation
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/cpu/armv7/exynos/clock.c | 43 |
1 files changed, 38 insertions, 5 deletions
diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c index e1c4246..9f07181 100644 --- a/arch/arm/cpu/armv7/exynos/clock.c +++ b/arch/arm/cpu/armv7/exynos/clock.c @@ -27,6 +27,10 @@ #include <asm/arch/clk.h> #include <asm/arch/periph.h> +#define PLL_DIV_1024 1024 +#define PLL_DIV_65535 65535 +#define PLL_DIV_65536 65536 + /* * * This structure is to store the src bit, div bit and prediv bit * positions of the peripheral clocks of the src and div registers @@ -85,6 +89,7 @@ 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] @@ -110,14 +115,42 @@ static int exynos_get_pll_clk(int pllreg, unsigned int r, unsigned int k) if (pllreg == EPLL) { k = k & 0xffff; /* FOUT = (MDIV + K / 65536) * FIN / (PDIV * 2^SDIV) */ - fout = (m + k / 65536) * (freq / (p * (1 << s))); + fout = (m + k / PLL_DIV_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 = PLL_DIV_1024; + else if (proid_is_exynos4412()) + div = PLL_DIV_65535; + else if (proid_is_exynos5250()) + div = PLL_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; |