diff options
Diffstat (limited to 'arch/arm/plat-s5pc1xx/include/plat/pll.h')
| -rw-r--r-- | arch/arm/plat-s5pc1xx/include/plat/pll.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/arm/plat-s5pc1xx/include/plat/pll.h b/arch/arm/plat-s5pc1xx/include/plat/pll.h new file mode 100644 index 0000000..21afef1 --- /dev/null +++ b/arch/arm/plat-s5pc1xx/include/plat/pll.h @@ -0,0 +1,38 @@ +/* arch/arm/plat-s5pc1xx/include/plat/pll.h + * + * Copyright 2009 Samsung Electronics Co. + * Byungho Min <bhmin@samsung.com> + * + * S5PC1XX PLL code + * + * Based on plat-s3c64xx/include/plat/pll.h + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. +*/ + +#define S5P_PLL_MDIV_MASK ((1 << (25-16+1)) - 1) +#define S5P_PLL_PDIV_MASK ((1 << (13-8+1)) - 1) +#define S5P_PLL_SDIV_MASK ((1 << (2-0+1)) - 1) +#define S5P_PLL_MDIV_SHIFT (16) +#define S5P_PLL_PDIV_SHIFT (8) +#define S5P_PLL_SDIV_SHIFT (0) + +#include <asm/div64.h> + +static inline unsigned long s5pc1xx_get_pll(unsigned long baseclk, + u32 pllcon) +{ + u32 mdiv, pdiv, sdiv; + u64 fvco = baseclk; + + mdiv = (pllcon >> S5P_PLL_MDIV_SHIFT) & S5P_PLL_MDIV_MASK; + pdiv = (pllcon >> S5P_PLL_PDIV_SHIFT) & S5P_PLL_PDIV_MASK; + sdiv = (pllcon >> S5P_PLL_SDIV_SHIFT) & S5P_PLL_SDIV_MASK; + + fvco *= mdiv; + do_div(fvco, (pdiv << sdiv)); + + return (unsigned long)fvco; +} |