/* arch/arm/plat-samsung/include/plat/pll6553x.h * partially from arch/arm/mach-s3c64xx/include/mach/pll.h * * Copyright 2008 Openmoko, Inc. * Copyright 2008 Simtec Electronics * Ben Dooks <ben@simtec.co.uk> * http://armlinux.simtec.co.uk/ * * Samsung PLL6553x PLL code * * 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. */ /* S3C6400 and compatible (S3C2416, etc.) EPLL code */ #define PLL6553X_MDIV_MASK ((1 << (23-16)) - 1) #define PLL6553X_PDIV_MASK ((1 << (13-8)) - 1) #define PLL6553X_SDIV_MASK ((1 << (2-0)) - 1) #define PLL6553X_MDIV_SHIFT (16) #define PLL6553X_PDIV_SHIFT (8) #define PLL6553X_SDIV_SHIFT (0) #define PLL6553X_KDIV_MASK (0xffff) static inline unsigned long s3c_get_pll6553x(unsigned long baseclk, u32 pll0, u32 pll1) { unsigned long result; u32 mdiv, pdiv, sdiv, kdiv; u64 tmp; mdiv = (pll0 >> PLL6553X_MDIV_SHIFT) & PLL6553X_MDIV_MASK; pdiv = (pll0 >> PLL6553X_PDIV_SHIFT) & PLL6553X_PDIV_MASK; sdiv = (pll0 >> PLL6553X_SDIV_SHIFT) & PLL6553X_SDIV_MASK; kdiv = pll1 & PLL6553X_KDIV_MASK; /* We need to multiple baseclk by mdiv (the integer part) and kdiv * which is in 2^16ths, so shift mdiv up (does not overflow) and * add kdiv before multiplying. The use of tmp is to avoid any * overflows before shifting bac down into result when multipling * by the mdiv and kdiv pair. */ tmp = baseclk; tmp *= (mdiv << 16) + kdiv; do_div(tmp, (pdiv << sdiv)); result = tmp >> 16; return result; }