| /* 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; |
| } |
