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Diffstat (limited to 'drivers/clk/samsung/clk-cpu.h')
| -rw-r--r-- | drivers/clk/samsung/clk-cpu.h | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/clk/samsung/clk-cpu.h b/drivers/clk/samsung/clk-cpu.h new file mode 100644 index 000000000000..37874d3c3165 --- /dev/null +++ b/drivers/clk/samsung/clk-cpu.h @@ -0,0 +1,73 @@ +/* + * 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 */ |