| Byungho Min | c1cc3db | 2009-06-23 21:39:56 +0900 | [diff] [blame] | 1 | /* arch/arm/plat-s5pc1xx/include/plat/pll.h |
| 2 | * |
| 3 | * Copyright 2009 Samsung Electronics Co. |
| 4 | * Byungho Min <bhmin@samsung.com> |
| 5 | * |
| 6 | * S5PC1XX PLL code |
| 7 | * |
| 8 | * Based on plat-s3c64xx/include/plat/pll.h |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | */ |
| 14 | |
| 15 | #define S5P_PLL_MDIV_MASK ((1 << (25-16+1)) - 1) |
| 16 | #define S5P_PLL_PDIV_MASK ((1 << (13-8+1)) - 1) |
| 17 | #define S5P_PLL_SDIV_MASK ((1 << (2-0+1)) - 1) |
| 18 | #define S5P_PLL_MDIV_SHIFT (16) |
| 19 | #define S5P_PLL_PDIV_SHIFT (8) |
| 20 | #define S5P_PLL_SDIV_SHIFT (0) |
| 21 | |
| 22 | #include <asm/div64.h> |
| 23 | |
| 24 | static inline unsigned long s5pc1xx_get_pll(unsigned long baseclk, |
| 25 | u32 pllcon) |
| 26 | { |
| 27 | u32 mdiv, pdiv, sdiv; |
| 28 | u64 fvco = baseclk; |
| 29 | |
| 30 | mdiv = (pllcon >> S5P_PLL_MDIV_SHIFT) & S5P_PLL_MDIV_MASK; |
| 31 | pdiv = (pllcon >> S5P_PLL_PDIV_SHIFT) & S5P_PLL_PDIV_MASK; |
| 32 | sdiv = (pllcon >> S5P_PLL_SDIV_SHIFT) & S5P_PLL_SDIV_MASK; |
| 33 | |
| 34 | fvco *= mdiv; |
| 35 | do_div(fvco, (pdiv << sdiv)); |
| 36 | |
| 37 | return (unsigned long)fvco; |
| 38 | } |