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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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1da220e3a5
clk_notifier_register() documentation states, that the provided notifier callbacks associated with the notifier must not re-enter into the clk framework by calling any top-level clk APIs. Fix this by replacing clk_get_rate() calls with clk_hw_get_rate(), which is safe in this context. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Sylwester Nawrocki <snawrocki@kernel.org>
76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
/*
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* Copyright (c) 2014 Samsung Electronics Co., Ltd.
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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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* Common Clock Framework support for all PLL's in Samsung platforms
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*/
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#ifndef __SAMSUNG_CLK_CPU_H
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#define __SAMSUNG_CLK_CPU_H
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#include "clk.h"
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/**
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* struct exynos_cpuclk_data: config data to setup cpu clocks.
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* @prate: frequency of the primary parent clock (in KHz).
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* @div0: value to be programmed in the div_cpu0 register.
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* @div1: value to be programmed in the div_cpu1 register.
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*
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* This structure holds the divider configuration data for dividers in the CPU
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* clock domain. The parent frequency at which these divider values are valid is
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* specified in @prate. The @prate is the frequency of the primary parent clock.
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* For CPU clock domains that do not have a DIV1 register, the @div1 member
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* value is not used.
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*/
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struct exynos_cpuclk_cfg_data {
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unsigned long prate;
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unsigned long div0;
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unsigned long div1;
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};
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/**
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* struct exynos_cpuclk: information about clock supplied to a CPU core.
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* @hw: handle between CCF and CPU clock.
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* @alt_parent: alternate parent clock to use when switching the speed
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* of the primary parent clock.
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* @ctrl_base: base address of the clock controller.
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* @lock: cpu clock domain register access lock.
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* @cfg: cpu clock rate configuration data.
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* @num_cfgs: number of array elements in @cfg array.
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* @clk_nb: clock notifier registered for changes in clock speed of the
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* primary parent clock.
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* @flags: configuration flags for the CPU clock.
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*
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* This structure holds information required for programming the CPU clock for
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* various clock speeds.
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*/
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struct exynos_cpuclk {
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struct clk_hw hw;
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struct clk_hw *alt_parent;
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void __iomem *ctrl_base;
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spinlock_t *lock;
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const struct exynos_cpuclk_cfg_data *cfg;
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const unsigned long num_cfgs;
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struct notifier_block clk_nb;
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unsigned long flags;
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/* The CPU clock registers have DIV1 configuration register */
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#define CLK_CPU_HAS_DIV1 (1 << 0)
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/* When ALT parent is active, debug clocks need safe divider values */
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#define CLK_CPU_NEEDS_DEBUG_ALT_DIV (1 << 1)
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/* The CPU clock registers have Exynos5433-compatible layout */
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#define CLK_CPU_HAS_E5433_REGS_LAYOUT (1 << 2)
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};
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extern int __init exynos_register_cpu_clock(struct samsung_clk_provider *ctx,
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unsigned int lookup_id, const char *name,
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const char *parent, const char *alt_parent,
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unsigned long offset,
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const struct exynos_cpuclk_cfg_data *cfg,
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unsigned long num_cfgs, unsigned long flags);
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#endif /* __SAMSUNG_CLK_CPU_H */
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