551b62b1e4
For the individual CCU drivers to be built as modules, the ops structs, helper functions, and callback registration functions must be exported. These symbols are intended for use only by the adjacent CCU drivers, so export them into the SUNXI_CCU namespace. of_sunxi_ccu_probe is not exported because it is only used by built-in OF clock providers. Signed-off-by: Samuel Holland <samuel@sholland.org> Signed-off-by: Maxime Ripard <maxime@cerno.tech> Link: https://lore.kernel.org/r/20211119033338.25486-2-samuel@sholland.org
161 lines
3.6 KiB
C
161 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2016 Maxime Ripard
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* Maxime Ripard <maxime.ripard@free-electrons.com>
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*/
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#include <linux/clk-provider.h>
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#include <linux/io.h>
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#include "ccu_gate.h"
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#include "ccu_nk.h"
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struct _ccu_nk {
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unsigned long n, min_n, max_n;
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unsigned long k, min_k, max_k;
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};
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static void ccu_nk_find_best(unsigned long parent, unsigned long rate,
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struct _ccu_nk *nk)
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{
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unsigned long best_rate = 0;
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unsigned int best_k = 0, best_n = 0;
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unsigned int _k, _n;
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for (_k = nk->min_k; _k <= nk->max_k; _k++) {
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for (_n = nk->min_n; _n <= nk->max_n; _n++) {
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unsigned long tmp_rate = parent * _n * _k;
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if (tmp_rate > rate)
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continue;
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if ((rate - tmp_rate) < (rate - best_rate)) {
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best_rate = tmp_rate;
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best_k = _k;
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best_n = _n;
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}
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}
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}
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nk->k = best_k;
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nk->n = best_n;
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}
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static void ccu_nk_disable(struct clk_hw *hw)
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{
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struct ccu_nk *nk = hw_to_ccu_nk(hw);
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return ccu_gate_helper_disable(&nk->common, nk->enable);
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}
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static int ccu_nk_enable(struct clk_hw *hw)
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{
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struct ccu_nk *nk = hw_to_ccu_nk(hw);
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return ccu_gate_helper_enable(&nk->common, nk->enable);
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}
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static int ccu_nk_is_enabled(struct clk_hw *hw)
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{
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struct ccu_nk *nk = hw_to_ccu_nk(hw);
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return ccu_gate_helper_is_enabled(&nk->common, nk->enable);
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}
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static unsigned long ccu_nk_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct ccu_nk *nk = hw_to_ccu_nk(hw);
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unsigned long rate, n, k;
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u32 reg;
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reg = readl(nk->common.base + nk->common.reg);
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n = reg >> nk->n.shift;
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n &= (1 << nk->n.width) - 1;
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n += nk->n.offset;
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if (!n)
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n++;
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k = reg >> nk->k.shift;
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k &= (1 << nk->k.width) - 1;
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k += nk->k.offset;
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if (!k)
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k++;
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rate = parent_rate * n * k;
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if (nk->common.features & CCU_FEATURE_FIXED_POSTDIV)
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rate /= nk->fixed_post_div;
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return rate;
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}
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static long ccu_nk_round_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long *parent_rate)
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{
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struct ccu_nk *nk = hw_to_ccu_nk(hw);
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struct _ccu_nk _nk;
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if (nk->common.features & CCU_FEATURE_FIXED_POSTDIV)
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rate *= nk->fixed_post_div;
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_nk.min_n = nk->n.min ?: 1;
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_nk.max_n = nk->n.max ?: 1 << nk->n.width;
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_nk.min_k = nk->k.min ?: 1;
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_nk.max_k = nk->k.max ?: 1 << nk->k.width;
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ccu_nk_find_best(*parent_rate, rate, &_nk);
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rate = *parent_rate * _nk.n * _nk.k;
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if (nk->common.features & CCU_FEATURE_FIXED_POSTDIV)
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rate = rate / nk->fixed_post_div;
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return rate;
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}
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static int ccu_nk_set_rate(struct clk_hw *hw, unsigned long rate,
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unsigned long parent_rate)
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{
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struct ccu_nk *nk = hw_to_ccu_nk(hw);
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unsigned long flags;
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struct _ccu_nk _nk;
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u32 reg;
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if (nk->common.features & CCU_FEATURE_FIXED_POSTDIV)
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rate = rate * nk->fixed_post_div;
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_nk.min_n = nk->n.min ?: 1;
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_nk.max_n = nk->n.max ?: 1 << nk->n.width;
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_nk.min_k = nk->k.min ?: 1;
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_nk.max_k = nk->k.max ?: 1 << nk->k.width;
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ccu_nk_find_best(parent_rate, rate, &_nk);
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spin_lock_irqsave(nk->common.lock, flags);
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reg = readl(nk->common.base + nk->common.reg);
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reg &= ~GENMASK(nk->n.width + nk->n.shift - 1, nk->n.shift);
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reg &= ~GENMASK(nk->k.width + nk->k.shift - 1, nk->k.shift);
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reg |= (_nk.k - nk->k.offset) << nk->k.shift;
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reg |= (_nk.n - nk->n.offset) << nk->n.shift;
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writel(reg, nk->common.base + nk->common.reg);
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spin_unlock_irqrestore(nk->common.lock, flags);
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ccu_helper_wait_for_lock(&nk->common, nk->lock);
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return 0;
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}
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const struct clk_ops ccu_nk_ops = {
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.disable = ccu_nk_disable,
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.enable = ccu_nk_enable,
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.is_enabled = ccu_nk_is_enabled,
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.recalc_rate = ccu_nk_recalc_rate,
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.round_rate = ccu_nk_round_rate,
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.set_rate = ccu_nk_set_rate,
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};
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EXPORT_SYMBOL_NS_GPL(ccu_nk_ops, SUNXI_CCU);
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