146 строки
4.4 KiB
C
146 строки
4.4 KiB
C
/* arch/arm/plat-samsung/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 - frequency information (mainly for core drivers)
|
|
* @fclk: The FCLK frequency in Hz.
|
|
* @armclk: The ARMCLK frequency in Hz.
|
|
* @hclk_tns: HCLK cycle time in 10ths of nano-seconds.
|
|
* @hclk: The HCLK frequency in Hz.
|
|
* @pclk: The PCLK frequency in Hz.
|
|
*
|
|
* This contains the frequency information about the current configuration
|
|
* mainly for the core drivers to ensure we do not end up passing about
|
|
* a large number of parameters.
|
|
*
|
|
* The @hclk_tns field is a useful cache for the parts of the drivers that
|
|
* need to calculate IO timings and suchlike.
|
|
*/
|
|
struct s3c_freq {
|
|
unsigned long fclk;
|
|
unsigned long armclk;
|
|
unsigned long hclk_tns; /* in 10ths of ns */
|
|
unsigned long hclk;
|
|
unsigned long pclk;
|
|
};
|
|
|
|
/**
|
|
* struct s3c_cpufreq_freqs - s3c cpufreq notification information.
|
|
* @freqs: The cpufreq setting information.
|
|
* @old: The old clock settings.
|
|
* @new: The new clock settings.
|
|
* @pll_changing: Set if the PLL is changing.
|
|
*
|
|
* 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.
|
|
*
|
|
* The pll_changing flag is used to indicate if the PLL itself is
|
|
* being set during this change. This is important as the clocks
|
|
* will temporarily be set to the XTAL clock during this time, so
|
|
* drivers may want to close down their output during this time.
|
|
*
|
|
* Note, this is not being used by any current drivers and therefore
|
|
* may be removed in the future.
|
|
*/
|
|
struct s3c_cpufreq_freqs {
|
|
struct cpufreq_freqs freqs;
|
|
struct s3c_freq old;
|
|
struct s3c_freq new;
|
|
|
|
unsigned int pll_changing:1;
|
|
};
|
|
|
|
#define to_s3c_cpufreq(_cf) container_of(_cf, struct s3c_cpufreq_freqs, freqs)
|
|
|
|
/**
|
|
* struct s3c_clkdivs - clock divisor information
|
|
* @p_divisor: Divisor from FCLK to PCLK.
|
|
* @h_divisor: Divisor from FCLK to HCLK.
|
|
* @arm_divisor: Divisor from FCLK to ARMCLK (not all CPUs).
|
|
* @dvs: Non-zero if using DVS mode for ARMCLK.
|
|
*
|
|
* Divisor settings for the core clocks.
|
|
*/
|
|
struct s3c_clkdivs {
|
|
int p_divisor;
|
|
int h_divisor;
|
|
int arm_divisor;
|
|
unsigned char dvs;
|
|
};
|
|
|
|
#define PLLVAL(_m, _p, _s) (((_m) << 12) | ((_p) << 4) | (_s))
|
|
|
|
/**
|
|
* struct s3c_pllval - PLL value entry.
|
|
* @freq: The frequency for this entry in Hz.
|
|
* @pll_reg: The PLL register setting for this PLL value.
|
|
*/
|
|
struct s3c_pllval {
|
|
unsigned long freq;
|
|
unsigned long pll_reg;
|
|
};
|
|
|
|
/**
|
|
* struct s3c_cpufreq_board - per-board cpu frequency informatin
|
|
* @refresh: The SDRAM refresh period in nanoseconds.
|
|
* @auto_io: Set if the IO timing settings should be generated from the
|
|
* initialisation time hardware registers.
|
|
* @need_io: Set if the board has external IO on any of the chipselect
|
|
* lines that will require the hardware timing registers to be
|
|
* updated on a clock change.
|
|
* @max: The maxium frequency limits for the system. Any field that
|
|
* is left at zero will use the CPU's settings.
|
|
*
|
|
* This contains the board specific settings that affect how the CPU
|
|
* drivers chose settings. These include the memory refresh and IO
|
|
* timing information.
|
|
*
|
|
* Registration depends on the driver being used, the ARMCLK only
|
|
* implementation does not currently need this but the older style
|
|
* driver requires this to be available.
|
|
*/
|
|
struct s3c_cpufreq_board {
|
|
unsigned int refresh;
|
|
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_ARM_S3C_CPUFREQ
|
|
#define __init_or_cpufreq
|
|
#else
|
|
#define __init_or_cpufreq __init
|
|
#endif
|
|
|
|
/* Board functions */
|
|
|
|
#ifdef CONFIG_ARM_S3C_CPUFREQ
|
|
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_ARM_S3C_CPUFREQ */
|