clk: sunxi-ng: Add N-K-factor clock support (adbfb005) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/clk/sunxi-ng/Kconfig

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	@@ -24,6 +24,10 @@ config SUNXI_CCU_PHASE

	# Multi-factor clocks		# Multi-factor clocks

			config SUNXI_CCU_NK
			bool
			select SUNXI_CCU_GATE

	config SUNXI_CCU_MP		config SUNXI_CCU_MP
	bool		bool
	select SUNXI_CCU_GATE		select SUNXI_CCU_GATE

drivers/clk/sunxi-ng/Makefile

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	@@ -10,4 +10,5 @@ obj-$(CONFIG_SUNXI_CCU_MUX) += ccu_mux.o
	obj-$(CONFIG_SUNXI_CCU_PHASE) += ccu_phase.o		obj-$(CONFIG_SUNXI_CCU_PHASE) += ccu_phase.o

	# Multi-factor clocks		# Multi-factor clocks
			obj-$(CONFIG_SUNXI_CCU_NK) += ccu_nk.o
	obj-$(CONFIG_SUNXI_CCU_MP) += ccu_mp.o		obj-$(CONFIG_SUNXI_CCU_MP) += ccu_mp.o

drivers/clk/sunxi-ng/ccu_nk.c

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			/*
			* Copyright (C) 2016 Maxime Ripard
			* Maxime Ripard <maxime.ripard@free-electrons.com>
			*
			* This program is free software; you can redistribute it and/or
			* modify it under the terms of the GNU General Public License as
			* published by the Free Software Foundation; either version 2 of
			* the License, or (at your option) any later version.
			*/

			#include <linux/clk-provider.h>
			#include <linux/rational.h>

			#include "ccu_gate.h"
			#include "ccu_nk.h"

			void ccu_nk_find_best(unsigned long parent, unsigned long rate,
			unsigned int max_n, unsigned int max_k,
			unsigned int n, unsigned int k)
			{
			unsigned long best_rate = 0;
			unsigned int best_k = 0, best_n = 0;
			unsigned int _k, _n;

			for (_k = 1; _k <= max_k; _k++) {
			for (_n = 1; _n <= max_n; _n++) {
			unsigned long tmp_rate = parent * _n * _k;

			if (tmp_rate > rate)
			continue;

			if ((rate - tmp_rate) < (rate - best_rate)) {
			best_rate = tmp_rate;
			best_k = _k;
			best_n = _n;
			}
			}
			}

			*k = best_k;
			*n = best_n;
			}

			static void ccu_nk_disable(struct clk_hw *hw)
			{
			struct ccu_nk *nk = hw_to_ccu_nk(hw);

			return ccu_gate_helper_disable(&nk->common, nk->enable);
			}

			static int ccu_nk_enable(struct clk_hw *hw)
			{
			struct ccu_nk *nk = hw_to_ccu_nk(hw);

			return ccu_gate_helper_enable(&nk->common, nk->enable);
			}

			static int ccu_nk_is_enabled(struct clk_hw *hw)
			{
			struct ccu_nk *nk = hw_to_ccu_nk(hw);

			return ccu_gate_helper_is_enabled(&nk->common, nk->enable);
			}

			static unsigned long ccu_nk_recalc_rate(struct clk_hw *hw,
			unsigned long parent_rate)
			{
			struct ccu_nk *nk = hw_to_ccu_nk(hw);
			unsigned long rate, n, k;
			u32 reg;

			reg = readl(nk->common.base + nk->common.reg);

			n = reg >> nk->n.shift;
			n &= (1 << nk->n.width) - 1;

			k = reg >> nk->k.shift;
			k &= (1 << nk->k.width) - 1;

			rate = parent_rate * (n + 1) * (k + 1);

			if (nk->common.features & CCU_FEATURE_FIXED_POSTDIV)
			rate /= nk->fixed_post_div;

			return rate;
			}

			static long ccu_nk_round_rate(struct clk_hw *hw, unsigned long rate,
			unsigned long *parent_rate)
			{
			struct ccu_nk *nk = hw_to_ccu_nk(hw);
			unsigned int n, k;

			if (nk->common.features & CCU_FEATURE_FIXED_POSTDIV)
			rate *= nk->fixed_post_div;

			ccu_nk_find_best(*parent_rate, rate,
			1 << nk->n.width, 1 << nk->k.width,
			&n, &k);

			rate = parent_rate n * k;
			if (nk->common.features & CCU_FEATURE_FIXED_POSTDIV)
			rate = rate / nk->fixed_post_div;

			return rate;
			}

			static int ccu_nk_set_rate(struct clk_hw *hw, unsigned long rate,
			unsigned long parent_rate)
			{
			struct ccu_nk *nk = hw_to_ccu_nk(hw);
			unsigned long flags;
			unsigned int n, k;
			u32 reg;

			if (nk->common.features & CCU_FEATURE_FIXED_POSTDIV)
			rate = rate * nk->fixed_post_div;

			ccu_nk_find_best(parent_rate, rate,
			1 << nk->n.width, 1 << nk->k.width,
			&n, &k);

			spin_lock_irqsave(nk->common.lock, flags);

			reg = readl(nk->common.base + nk->common.reg);
			reg &= ~GENMASK(nk->n.width + nk->n.shift - 1, nk->n.shift);
			reg &= ~GENMASK(nk->k.width + nk->k.shift - 1, nk->k.shift);

			writel(reg \| ((k - 1) << nk->k.shift) \| ((n - 1) << nk->n.shift),
			nk->common.base + nk->common.reg);

			spin_unlock_irqrestore(nk->common.lock, flags);

			ccu_helper_wait_for_lock(&nk->common, nk->lock);

			return 0;
			}

			const struct clk_ops ccu_nk_ops = {
			.disable = ccu_nk_disable,
			.enable = ccu_nk_enable,
			.is_enabled = ccu_nk_is_enabled,

			.recalc_rate = ccu_nk_recalc_rate,
			.round_rate = ccu_nk_round_rate,
			.set_rate = ccu_nk_set_rate,
			};

drivers/clk/sunxi-ng/ccu_nk.h

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			/*
			* Copyright (c) 2016 Maxime Ripard. All rights reserved.
			*
			* This software is licensed under the terms of the GNU General Public
			* License version 2, as published by the Free Software Foundation, and
			* may be copied, distributed, and modified under those terms.
			*
			* This program is distributed in the hope that it will be useful,
			* but WITHOUT ANY WARRANTY; without even the implied warranty of
			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
			* GNU General Public License for more details.
			*/

			#ifndef _CCU_NK_H_
			#define _CCU_NK_H_

			#include <linux/clk-provider.h>

			#include "ccu_common.h"
			#include "ccu_div.h"
			#include "ccu_mult.h"

			/*
			* struct ccu_nk - Definition of an N-K clock
			*
			* Clocks based on the formula parent * N * K
			*/
			struct ccu_nk {
			u16 reg;
			u32 enable;
			u32 lock;

			struct _ccu_mult n;
			struct _ccu_mult k;

			unsigned int fixed_post_div;

			struct ccu_common common;
			};

			#define SUNXI_CCU_NK_WITH_GATE_LOCK_POSTDIV(_struct, _name, _parent, _reg, \
			_nshift, _nwidth, \
			_kshift, _kwidth, \
			_gate, _lock, _postdiv, \
			_flags) \
			struct ccu_nk _struct = { \
			.enable = _gate, \
			.lock = _lock, \
			.k = _SUNXI_CCU_MULT(_kshift, _kwidth), \
			.n = _SUNXI_CCU_MULT(_nshift, _nwidth), \
			.fixed_post_div = _postdiv, \
			.common = { \
			.reg = _reg, \
			.features = CCU_FEATURE_FIXED_POSTDIV, \
			.hw.init = CLK_HW_INIT(_name, \
			_parent, \
			&ccu_nk_ops, \
			_flags), \
			}, \
			}

			static inline struct ccu_nk hw_to_ccu_nk(struct clk_hw hw)
			{
			struct ccu_common *common = hw_to_ccu_common(hw);

			return container_of(common, struct ccu_nk, common);
			}

			extern const struct clk_ops ccu_nk_ops;

			#endif /* _CCU_NK_H_ */