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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * Copyright (C) 2016 Maxime Ripard
- * Maxime Ripard <[email protected]>
- */
- #include <linux/clk-provider.h>
- #include <linux/io.h>
- #include "ccu_gate.h"
- #include "ccu_nkmp.h"
- struct _ccu_nkmp {
- unsigned long n, min_n, max_n;
- unsigned long k, min_k, max_k;
- unsigned long m, min_m, max_m;
- unsigned long p, min_p, max_p;
- };
- static unsigned long ccu_nkmp_calc_rate(unsigned long parent,
- unsigned long n, unsigned long k,
- unsigned long m, unsigned long p)
- {
- u64 rate = parent;
- rate *= n * k;
- do_div(rate, m * p);
- return rate;
- }
- static void ccu_nkmp_find_best(unsigned long parent, unsigned long rate,
- struct _ccu_nkmp *nkmp)
- {
- unsigned long best_rate = 0;
- unsigned long best_n = 0, best_k = 0, best_m = 0, best_p = 0;
- unsigned long _n, _k, _m, _p;
- for (_k = nkmp->min_k; _k <= nkmp->max_k; _k++) {
- for (_n = nkmp->min_n; _n <= nkmp->max_n; _n++) {
- for (_m = nkmp->min_m; _m <= nkmp->max_m; _m++) {
- for (_p = nkmp->min_p; _p <= nkmp->max_p; _p <<= 1) {
- unsigned long tmp_rate;
- tmp_rate = ccu_nkmp_calc_rate(parent,
- _n, _k,
- _m, _p);
- if (tmp_rate > rate)
- continue;
- if ((rate - tmp_rate) < (rate - best_rate)) {
- best_rate = tmp_rate;
- best_n = _n;
- best_k = _k;
- best_m = _m;
- best_p = _p;
- }
- }
- }
- }
- }
- nkmp->n = best_n;
- nkmp->k = best_k;
- nkmp->m = best_m;
- nkmp->p = best_p;
- }
- static void ccu_nkmp_disable(struct clk_hw *hw)
- {
- struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
- return ccu_gate_helper_disable(&nkmp->common, nkmp->enable);
- }
- static int ccu_nkmp_enable(struct clk_hw *hw)
- {
- struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
- return ccu_gate_helper_enable(&nkmp->common, nkmp->enable);
- }
- static int ccu_nkmp_is_enabled(struct clk_hw *hw)
- {
- struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
- return ccu_gate_helper_is_enabled(&nkmp->common, nkmp->enable);
- }
- static unsigned long ccu_nkmp_recalc_rate(struct clk_hw *hw,
- unsigned long parent_rate)
- {
- struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
- unsigned long n, m, k, p, rate;
- u32 reg;
- reg = readl(nkmp->common.base + nkmp->common.reg);
- n = reg >> nkmp->n.shift;
- n &= (1 << nkmp->n.width) - 1;
- n += nkmp->n.offset;
- if (!n)
- n++;
- k = reg >> nkmp->k.shift;
- k &= (1 << nkmp->k.width) - 1;
- k += nkmp->k.offset;
- if (!k)
- k++;
- m = reg >> nkmp->m.shift;
- m &= (1 << nkmp->m.width) - 1;
- m += nkmp->m.offset;
- if (!m)
- m++;
- p = reg >> nkmp->p.shift;
- p &= (1 << nkmp->p.width) - 1;
- rate = ccu_nkmp_calc_rate(parent_rate, n, k, m, 1 << p);
- if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
- rate /= nkmp->fixed_post_div;
- return rate;
- }
- static long ccu_nkmp_round_rate(struct clk_hw *hw, unsigned long rate,
- unsigned long *parent_rate)
- {
- struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
- struct _ccu_nkmp _nkmp;
- if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
- rate *= nkmp->fixed_post_div;
- if (nkmp->max_rate && rate > nkmp->max_rate) {
- rate = nkmp->max_rate;
- if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
- rate /= nkmp->fixed_post_div;
- return rate;
- }
- _nkmp.min_n = nkmp->n.min ?: 1;
- _nkmp.max_n = nkmp->n.max ?: 1 << nkmp->n.width;
- _nkmp.min_k = nkmp->k.min ?: 1;
- _nkmp.max_k = nkmp->k.max ?: 1 << nkmp->k.width;
- _nkmp.min_m = 1;
- _nkmp.max_m = nkmp->m.max ?: 1 << nkmp->m.width;
- _nkmp.min_p = 1;
- _nkmp.max_p = nkmp->p.max ?: 1 << ((1 << nkmp->p.width) - 1);
- ccu_nkmp_find_best(*parent_rate, rate, &_nkmp);
- rate = ccu_nkmp_calc_rate(*parent_rate, _nkmp.n, _nkmp.k,
- _nkmp.m, _nkmp.p);
- if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
- rate = rate / nkmp->fixed_post_div;
- return rate;
- }
- static int ccu_nkmp_set_rate(struct clk_hw *hw, unsigned long rate,
- unsigned long parent_rate)
- {
- struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
- u32 n_mask = 0, k_mask = 0, m_mask = 0, p_mask = 0;
- struct _ccu_nkmp _nkmp;
- unsigned long flags;
- u32 reg;
- if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
- rate = rate * nkmp->fixed_post_div;
- _nkmp.min_n = nkmp->n.min ?: 1;
- _nkmp.max_n = nkmp->n.max ?: 1 << nkmp->n.width;
- _nkmp.min_k = nkmp->k.min ?: 1;
- _nkmp.max_k = nkmp->k.max ?: 1 << nkmp->k.width;
- _nkmp.min_m = 1;
- _nkmp.max_m = nkmp->m.max ?: 1 << nkmp->m.width;
- _nkmp.min_p = 1;
- _nkmp.max_p = nkmp->p.max ?: 1 << ((1 << nkmp->p.width) - 1);
- ccu_nkmp_find_best(parent_rate, rate, &_nkmp);
- /*
- * If width is 0, GENMASK() macro may not generate expected mask (0)
- * as it falls under undefined behaviour by C standard due to shifts
- * which are equal or greater than width of left operand. This can
- * be easily avoided by explicitly checking if width is 0.
- */
- if (nkmp->n.width)
- n_mask = GENMASK(nkmp->n.width + nkmp->n.shift - 1,
- nkmp->n.shift);
- if (nkmp->k.width)
- k_mask = GENMASK(nkmp->k.width + nkmp->k.shift - 1,
- nkmp->k.shift);
- if (nkmp->m.width)
- m_mask = GENMASK(nkmp->m.width + nkmp->m.shift - 1,
- nkmp->m.shift);
- if (nkmp->p.width)
- p_mask = GENMASK(nkmp->p.width + nkmp->p.shift - 1,
- nkmp->p.shift);
- spin_lock_irqsave(nkmp->common.lock, flags);
- reg = readl(nkmp->common.base + nkmp->common.reg);
- reg &= ~(n_mask | k_mask | m_mask | p_mask);
- reg |= ((_nkmp.n - nkmp->n.offset) << nkmp->n.shift) & n_mask;
- reg |= ((_nkmp.k - nkmp->k.offset) << nkmp->k.shift) & k_mask;
- reg |= ((_nkmp.m - nkmp->m.offset) << nkmp->m.shift) & m_mask;
- reg |= (ilog2(_nkmp.p) << nkmp->p.shift) & p_mask;
- writel(reg, nkmp->common.base + nkmp->common.reg);
- spin_unlock_irqrestore(nkmp->common.lock, flags);
- ccu_helper_wait_for_lock(&nkmp->common, nkmp->lock);
- return 0;
- }
- const struct clk_ops ccu_nkmp_ops = {
- .disable = ccu_nkmp_disable,
- .enable = ccu_nkmp_enable,
- .is_enabled = ccu_nkmp_is_enabled,
- .recalc_rate = ccu_nkmp_recalc_rate,
- .round_rate = ccu_nkmp_round_rate,
- .set_rate = ccu_nkmp_set_rate,
- };
- EXPORT_SYMBOL_NS_GPL(ccu_nkmp_ops, SUNXI_CCU);
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