kernel/2.6.29.6-aldebaran-rt/arch/arm/plat-s3c/include/plat/cpu-freq.h

   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 */