2 * Copyright (C) 2016 Maxime Ripard
3 * Maxime Ripard <maxime.ripard@free-electrons.com>
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation; either version 2 of
8 * the License, or (at your option) any later version.
11 #include <linux/clk-provider.h>
17 unsigned long n, min_n, max_n;
18 unsigned long k, min_k, max_k;
19 unsigned long m, min_m, max_m;
20 unsigned long p, min_p, max_p;
23 static unsigned long ccu_nkmp_calc_rate(unsigned long parent,
24 unsigned long n, unsigned long k,
25 unsigned long m, unsigned long p)
35 static void ccu_nkmp_find_best(unsigned long parent, unsigned long rate,
36 struct _ccu_nkmp *nkmp)
38 unsigned long best_rate = 0;
39 unsigned long best_n = 0, best_k = 0, best_m = 0, best_p = 0;
40 unsigned long _n, _k, _m, _p;
42 for (_k = nkmp->min_k; _k <= nkmp->max_k; _k++) {
43 for (_n = nkmp->min_n; _n <= nkmp->max_n; _n++) {
44 for (_m = nkmp->min_m; _m <= nkmp->max_m; _m++) {
45 for (_p = nkmp->min_p; _p <= nkmp->max_p; _p <<= 1) {
46 unsigned long tmp_rate;
48 tmp_rate = ccu_nkmp_calc_rate(parent,
55 if ((rate - tmp_rate) < (rate - best_rate)) {
73 static void ccu_nkmp_disable(struct clk_hw *hw)
75 struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
77 return ccu_gate_helper_disable(&nkmp->common, nkmp->enable);
80 static int ccu_nkmp_enable(struct clk_hw *hw)
82 struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
84 return ccu_gate_helper_enable(&nkmp->common, nkmp->enable);
87 static int ccu_nkmp_is_enabled(struct clk_hw *hw)
89 struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
91 return ccu_gate_helper_is_enabled(&nkmp->common, nkmp->enable);
94 static unsigned long ccu_nkmp_recalc_rate(struct clk_hw *hw,
95 unsigned long parent_rate)
97 struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
98 unsigned long n, m, k, p, rate;
101 reg = readl(nkmp->common.base + nkmp->common.reg);
103 n = reg >> nkmp->n.shift;
104 n &= (1 << nkmp->n.width) - 1;
109 k = reg >> nkmp->k.shift;
110 k &= (1 << nkmp->k.width) - 1;
115 m = reg >> nkmp->m.shift;
116 m &= (1 << nkmp->m.width) - 1;
121 p = reg >> nkmp->p.shift;
122 p &= (1 << nkmp->p.width) - 1;
124 rate = ccu_nkmp_calc_rate(parent_rate, n, k, m, 1 << p);
125 if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
126 rate /= nkmp->fixed_post_div;
131 static long ccu_nkmp_round_rate(struct clk_hw *hw, unsigned long rate,
132 unsigned long *parent_rate)
134 struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
135 struct _ccu_nkmp _nkmp;
137 if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
138 rate *= nkmp->fixed_post_div;
140 _nkmp.min_n = nkmp->n.min ?: 1;
141 _nkmp.max_n = nkmp->n.max ?: 1 << nkmp->n.width;
142 _nkmp.min_k = nkmp->k.min ?: 1;
143 _nkmp.max_k = nkmp->k.max ?: 1 << nkmp->k.width;
145 _nkmp.max_m = nkmp->m.max ?: 1 << nkmp->m.width;
147 _nkmp.max_p = nkmp->p.max ?: 1 << ((1 << nkmp->p.width) - 1);
149 ccu_nkmp_find_best(*parent_rate, rate, &_nkmp);
151 rate = ccu_nkmp_calc_rate(*parent_rate, _nkmp.n, _nkmp.k,
153 if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
154 rate = rate / nkmp->fixed_post_div;
159 static int ccu_nkmp_set_rate(struct clk_hw *hw, unsigned long rate,
160 unsigned long parent_rate)
162 struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
163 u32 n_mask = 0, k_mask = 0, m_mask = 0, p_mask = 0;
164 struct _ccu_nkmp _nkmp;
168 if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
169 rate = rate * nkmp->fixed_post_div;
171 _nkmp.min_n = nkmp->n.min ?: 1;
172 _nkmp.max_n = nkmp->n.max ?: 1 << nkmp->n.width;
173 _nkmp.min_k = nkmp->k.min ?: 1;
174 _nkmp.max_k = nkmp->k.max ?: 1 << nkmp->k.width;
176 _nkmp.max_m = nkmp->m.max ?: 1 << nkmp->m.width;
178 _nkmp.max_p = nkmp->p.max ?: 1 << ((1 << nkmp->p.width) - 1);
180 ccu_nkmp_find_best(parent_rate, rate, &_nkmp);
183 n_mask = GENMASK(nkmp->n.width + nkmp->n.shift - 1,
186 k_mask = GENMASK(nkmp->k.width + nkmp->k.shift - 1,
189 m_mask = GENMASK(nkmp->m.width + nkmp->m.shift - 1,
192 p_mask = GENMASK(nkmp->p.width + nkmp->p.shift - 1,
195 spin_lock_irqsave(nkmp->common.lock, flags);
197 reg = readl(nkmp->common.base + nkmp->common.reg);
198 reg &= ~(n_mask | k_mask | m_mask | p_mask);
200 reg |= ((_nkmp.n - nkmp->n.offset) << nkmp->n.shift) & n_mask;
201 reg |= ((_nkmp.k - nkmp->k.offset) << nkmp->k.shift) & k_mask;
202 reg |= ((_nkmp.m - nkmp->m.offset) << nkmp->m.shift) & m_mask;
203 reg |= (ilog2(_nkmp.p) << nkmp->p.shift) & p_mask;
205 writel(reg, nkmp->common.base + nkmp->common.reg);
207 spin_unlock_irqrestore(nkmp->common.lock, flags);
209 ccu_helper_wait_for_lock(&nkmp->common, nkmp->lock);
214 const struct clk_ops ccu_nkmp_ops = {
215 .disable = ccu_nkmp_disable,
216 .enable = ccu_nkmp_enable,
217 .is_enabled = ccu_nkmp_is_enabled,
219 .recalc_rate = ccu_nkmp_recalc_rate,
220 .round_rate = ccu_nkmp_round_rate,
221 .set_rate = ccu_nkmp_set_rate,