clk-cpu.h
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/*
* Copyright (c) 2014 Samsung Electronics Co., Ltd.
*
* 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.
*
* Common Clock Framework support for all PLL's in Samsung platforms
*/
#ifndef __SAMSUNG_CLK_CPU_H
#define __SAMSUNG_CLK_CPU_H
#include "clk.h"
/**
* struct exynos_cpuclk_data: config data to setup cpu clocks.
* @prate: frequency of the primary parent clock (in KHz).
* @div0: value to be programmed in the div_cpu0 register.
* @div1: value to be programmed in the div_cpu1 register.
*
* This structure holds the divider configuration data for dividers in the CPU
* clock domain. The parent frequency at which these divider values are valid is
* specified in @prate. The @prate is the frequency of the primary parent clock.
* For CPU clock domains that do not have a DIV1 register, the @div1 member
* value is not used.
*/
struct exynos_cpuclk_cfg_data {
unsigned long prate;
unsigned long div0;
unsigned long div1;
};
/**
* struct exynos_cpuclk: information about clock supplied to a CPU core.
* @hw: handle between CCF and CPU clock.
* @alt_parent: alternate parent clock to use when switching the speed
* of the primary parent clock.
* @ctrl_base: base address of the clock controller.
* @lock: cpu clock domain register access lock.
* @cfg: cpu clock rate configuration data.
* @num_cfgs: number of array elements in @cfg array.
* @clk_nb: clock notifier registered for changes in clock speed of the
* primary parent clock.
* @flags: configuration flags for the CPU clock.
*
* This structure holds information required for programming the CPU clock for
* various clock speeds.
*/
struct exynos_cpuclk {
struct clk_hw hw;
struct clk *alt_parent;
void __iomem *ctrl_base;
spinlock_t *lock;
const struct exynos_cpuclk_cfg_data *cfg;
const unsigned long num_cfgs;
struct notifier_block clk_nb;
unsigned long flags;
/* The CPU clock registers has DIV1 configuration register */
#define CLK_CPU_HAS_DIV1 (1 << 0)
/* When ALT parent is active, debug clocks need safe divider values */
#define CLK_CPU_NEEDS_DEBUG_ALT_DIV (1 << 1)
};
extern int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
unsigned int lookup_id, const char *name,
const char *parent, const char *alt_parent,
unsigned long offset,
const struct exynos_cpuclk_cfg_data *cfg,
unsigned long num_cfgs, unsigned long flags);
#endif /* __SAMSUNG_CLK_CPU_H */