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This is the header file that defines the basic cpu frequency scalling support for the Samsung S3C series of SoC. Signed-off-by: Ben Dooks <ben-linux@fluff.org>
95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/* arch/arm/plat-s3c/include/plat/cpu-freq.h
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*
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* Copyright (c) 2006,2007 Simtec Electronics
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* http://armlinux.simtec.co.uk/
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* Ben Dooks <ben@simtec.co.uk>
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*
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* S3C CPU frequency scaling support - driver and board
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/cpufreq.h>
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struct s3c_cpufreq_info;
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struct s3c_cpufreq_board;
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struct s3c_iotimings;
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struct s3c_freq {
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unsigned long fclk;
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unsigned long armclk;
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unsigned long hclk_tns; /* in 10ths of ns */
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unsigned long hclk;
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unsigned long pclk;
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};
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/* wrapper 'struct cpufreq_freqs' so that any drivers receiving the
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* notification can use this information that is not provided by just
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* having the core frequency alone.
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*/
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struct s3c_cpufreq_freqs {
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struct cpufreq_freqs freqs;
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struct s3c_freq old;
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struct s3c_freq new;
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};
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#define to_s3c_cpufreq(_cf) container_of(_cf, struct s3c_cpufreq_freqs, freqs)
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struct s3c_clkdivs {
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int p_divisor; /* fclk / pclk */
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int h_divisor; /* fclk / hclk */
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int arm_divisor; /* not all cpus have this. */
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unsigned char dvs; /* using dvs mode to arm. */
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};
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#define PLLVAL(_m, _p, _s) (((_m) << 12) | ((_p) << 4) | (_s))
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struct s3c_pllval {
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unsigned long freq;
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unsigned long pll_reg;
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};
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struct s3c_cpufreq_config {
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struct s3c_freq freq;
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struct s3c_pllval pll;
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struct s3c_clkdivs divs;
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struct s3c_cpufreq_info *info; /* for core, not drivers */
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struct s3c_cpufreq_board *board;
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};
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/* s3c_cpufreq_board
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*
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* per-board configuraton information, such as memory refresh and
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* how to initialise IO timings.
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*/
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struct s3c_cpufreq_board {
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unsigned int refresh; /* refresh period in ns */
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unsigned int auto_io:1; /* automatically init io timings. */
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unsigned int need_io:1; /* set if needs io timing support. */
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/* any non-zero field in here is taken as an upper limit. */
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struct s3c_freq max; /* frequency limits */
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};
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/* Things depending on frequency scaling. */
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#ifdef CONFIG_CPU_FREQ_S3C
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#define __init_or_cpufreq
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#else
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#define __init_or_cpufreq __init
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#endif
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/* Board functions */
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#ifdef CONFIG_CPU_FREQ_S3C
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extern int s3c_cpufreq_setboard(struct s3c_cpufreq_board *board);
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#else
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static inline int s3c_cpufreq_setboard(struct s3c_cpufreq_board *board)
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{
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return 0;
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}
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#endif /* CONFIG_CPU_FREQ_S3C */
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