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[ARM] S3C: Add <plat/cpu-freq.h> for initial cpufreq definitions

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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>
This commit is contained in:
Ben Dooks 2008-10-21 14:06:21 +01:00
parent b2a6cf3b1e
commit 7f565ecc33
1 changed files with 94 additions and 0 deletions
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arch/arm/plat-s3c/include/plat/cpu-freq.h Normal file
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/* arch/arm/plat-s3c/include/plat/cpu-freq.h
*
* Copyright (c) 2006,2007 Simtec Electronics
* http://armlinux.simtec.co.uk/
* Ben Dooks <ben@simtec.co.uk>
*
* S3C CPU frequency scaling support - driver and board
*
* 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.
*/
#include <linux/cpufreq.h>
struct s3c_cpufreq_info;
struct s3c_cpufreq_board;
struct s3c_iotimings;
struct s3c_freq {
unsigned long fclk;
unsigned long armclk;
unsigned long hclk_tns; /* in 10ths of ns */
unsigned long hclk;
unsigned long pclk;
};
/* wrapper 'struct cpufreq_freqs' so that any drivers receiving the
* notification can use this information that is not provided by just
* having the core frequency alone.
*/
struct s3c_cpufreq_freqs {
struct cpufreq_freqs freqs;
struct s3c_freq old;
struct s3c_freq new;
};
#define to_s3c_cpufreq(_cf) container_of(_cf, struct s3c_cpufreq_freqs, freqs)
struct s3c_clkdivs {
int p_divisor; /* fclk / pclk */
int h_divisor; /* fclk / hclk */
int arm_divisor; /* not all cpus have this. */
unsigned char dvs; /* using dvs mode to arm. */
};
#define PLLVAL(_m, _p, _s) (((_m) << 12) | ((_p) << 4) | (_s))
struct s3c_pllval {
unsigned long freq;
unsigned long pll_reg;
};
struct s3c_cpufreq_config {
struct s3c_freq freq;
struct s3c_pllval pll;
struct s3c_clkdivs divs;
struct s3c_cpufreq_info *info; /* for core, not drivers */
struct s3c_cpufreq_board *board;
};
/* s3c_cpufreq_board
*
* per-board configuraton information, such as memory refresh and
* how to initialise IO timings.
*/
struct s3c_cpufreq_board {
unsigned int refresh; /* refresh period in ns */
unsigned int auto_io:1; /* automatically init io timings. */
unsigned int need_io:1; /* set if needs io timing support. */
/* any non-zero field in here is taken as an upper limit. */
struct s3c_freq max; /* frequency limits */
};
/* Things depending on frequency scaling. */
#ifdef CONFIG_CPU_FREQ_S3C
#define __init_or_cpufreq
#else
#define __init_or_cpufreq __init
#endif
/* Board functions */
#ifdef CONFIG_CPU_FREQ_S3C
extern int s3c_cpufreq_setboard(struct s3c_cpufreq_board *board);
#else
static inline int s3c_cpufreq_setboard(struct s3c_cpufreq_board *board)
{
return 0;
}
#endif /* CONFIG_CPU_FREQ_S3C */