From 849369d6c66d3054688672f97d31fceb8e8230fb Mon Sep 17 00:00:00 2001 From: root Date: Fri, 25 Dec 2015 04:40:36 +0000 Subject: initial_commit --- arch/arm/plat-samsung/include/plat/pll6553x.h | 51 +++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 arch/arm/plat-samsung/include/plat/pll6553x.h (limited to 'arch/arm/plat-samsung/include/plat/pll6553x.h') diff --git a/arch/arm/plat-samsung/include/plat/pll6553x.h b/arch/arm/plat-samsung/include/plat/pll6553x.h new file mode 100644 index 00000000..b8b7e1d8 --- /dev/null +++ b/arch/arm/plat-samsung/include/plat/pll6553x.h @@ -0,0 +1,51 @@ +/* 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 + * 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; +} -- cgit v1.2.3