| Ben Dooks | 7f565ec | 2008-10-21 14:06:21 +0100 | [diff] [blame] | 1 | /* arch/arm/plat-s3c/include/plat/cpu-freq.h |
| 2 | * |
| 3 | * Copyright (c) 2006,2007 Simtec Electronics |
| 4 | * http://armlinux.simtec.co.uk/ |
| 5 | * Ben Dooks <ben@simtec.co.uk> |
| 6 | * |
| 7 | * S3C CPU frequency scaling support - driver and board |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/cpufreq.h> |
| 15 | |
| 16 | struct s3c_cpufreq_info; |
| 17 | struct s3c_cpufreq_board; |
| 18 | struct s3c_iotimings; |
| 19 | |
| 20 | struct s3c_freq { |
| 21 | unsigned long fclk; |
| 22 | unsigned long armclk; |
| 23 | unsigned long hclk_tns; /* in 10ths of ns */ |
| 24 | unsigned long hclk; |
| 25 | unsigned long pclk; |
| 26 | }; |
| 27 | |
| 28 | /* wrapper 'struct cpufreq_freqs' so that any drivers receiving the |
| 29 | * notification can use this information that is not provided by just |
| 30 | * having the core frequency alone. |
| 31 | */ |
| 32 | |
| 33 | struct s3c_cpufreq_freqs { |
| 34 | struct cpufreq_freqs freqs; |
| 35 | struct s3c_freq old; |
| 36 | struct s3c_freq new; |
| 37 | }; |
| 38 | |
| 39 | #define to_s3c_cpufreq(_cf) container_of(_cf, struct s3c_cpufreq_freqs, freqs) |
| 40 | |
| 41 | struct s3c_clkdivs { |
| 42 | int p_divisor; /* fclk / pclk */ |
| 43 | int h_divisor; /* fclk / hclk */ |
| 44 | int arm_divisor; /* not all cpus have this. */ |
| 45 | unsigned char dvs; /* using dvs mode to arm. */ |
| 46 | }; |
| 47 | |
| 48 | #define PLLVAL(_m, _p, _s) (((_m) << 12) | ((_p) << 4) | (_s)) |
| 49 | |
| 50 | struct s3c_pllval { |
| 51 | unsigned long freq; |
| 52 | unsigned long pll_reg; |
| 53 | }; |
| 54 | |
| 55 | struct s3c_cpufreq_config { |
| 56 | struct s3c_freq freq; |
| 57 | struct s3c_pllval pll; |
| 58 | struct s3c_clkdivs divs; |
| 59 | struct s3c_cpufreq_info *info; /* for core, not drivers */ |
| 60 | struct s3c_cpufreq_board *board; |
| 61 | }; |
| 62 | |
| 63 | /* s3c_cpufreq_board |
| 64 | * |
| 65 | * per-board configuraton information, such as memory refresh and |
| 66 | * how to initialise IO timings. |
| 67 | */ |
| 68 | struct s3c_cpufreq_board { |
| 69 | unsigned int refresh; /* refresh period in ns */ |
| 70 | unsigned int auto_io:1; /* automatically init io timings. */ |
| 71 | unsigned int need_io:1; /* set if needs io timing support. */ |
| 72 | |
| 73 | /* any non-zero field in here is taken as an upper limit. */ |
| 74 | struct s3c_freq max; /* frequency limits */ |
| 75 | }; |
| 76 | |
| 77 | /* Things depending on frequency scaling. */ |
| 78 | #ifdef CONFIG_CPU_FREQ_S3C |
| 79 | #define __init_or_cpufreq |
| 80 | #else |
| 81 | #define __init_or_cpufreq __init |
| 82 | #endif |
| 83 | |
| 84 | /* Board functions */ |
| 85 | |
| 86 | #ifdef CONFIG_CPU_FREQ_S3C |
| 87 | extern int s3c_cpufreq_setboard(struct s3c_cpufreq_board *board); |
| 88 | #else |
| 89 | |
| 90 | static inline int s3c_cpufreq_setboard(struct s3c_cpufreq_board *board) |
| 91 | { |
| 92 | return 0; |
| 93 | } |
| 94 | #endif /* CONFIG_CPU_FREQ_S3C */ |