1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2016 Maxime Ripard
4 * Maxime Ripard <maxime.ripard@free-electrons.com>
7 #include <linux/clk-provider.h>
15 unsigned long n, min_n, max_n;
16 unsigned long m, min_m, max_m;
19 static unsigned long ccu_nm_calc_rate(unsigned long parent,
20 unsigned long n, unsigned long m)
30 static unsigned long ccu_nm_find_best(struct ccu_common *common, unsigned long parent,
31 unsigned long rate, struct _ccu_nm *nm)
33 unsigned long best_rate = 0;
34 unsigned long best_n = 0, best_m = 0;
37 for (_n = nm->min_n; _n <= nm->max_n; _n++) {
38 for (_m = nm->min_m; _m <= nm->max_m; _m++) {
39 unsigned long tmp_rate = ccu_nm_calc_rate(parent,
42 if (ccu_is_better_rate(common, rate, tmp_rate, best_rate)) {
56 static void ccu_nm_disable(struct clk_hw *hw)
58 struct ccu_nm *nm = hw_to_ccu_nm(hw);
60 return ccu_gate_helper_disable(&nm->common, nm->enable);
63 static int ccu_nm_enable(struct clk_hw *hw)
65 struct ccu_nm *nm = hw_to_ccu_nm(hw);
67 return ccu_gate_helper_enable(&nm->common, nm->enable);
70 static int ccu_nm_is_enabled(struct clk_hw *hw)
72 struct ccu_nm *nm = hw_to_ccu_nm(hw);
74 return ccu_gate_helper_is_enabled(&nm->common, nm->enable);
77 static unsigned long ccu_nm_recalc_rate(struct clk_hw *hw,
78 unsigned long parent_rate)
80 struct ccu_nm *nm = hw_to_ccu_nm(hw);
85 if (ccu_frac_helper_is_enabled(&nm->common, &nm->frac)) {
86 rate = ccu_frac_helper_read_rate(&nm->common, &nm->frac);
88 if (nm->common.features & CCU_FEATURE_FIXED_POSTDIV)
89 rate /= nm->fixed_post_div;
94 reg = readl(nm->common.base + nm->common.reg);
96 n = reg >> nm->n.shift;
97 n &= (1 << nm->n.width) - 1;
102 m = reg >> nm->m.shift;
103 m &= (1 << nm->m.width) - 1;
108 if (ccu_sdm_helper_is_enabled(&nm->common, &nm->sdm))
109 rate = ccu_sdm_helper_read_rate(&nm->common, &nm->sdm, m, n);
111 rate = ccu_nm_calc_rate(parent_rate, n, m);
113 if (nm->common.features & CCU_FEATURE_FIXED_POSTDIV)
114 rate /= nm->fixed_post_div;
119 static long ccu_nm_round_rate(struct clk_hw *hw, unsigned long rate,
120 unsigned long *parent_rate)
122 struct ccu_nm *nm = hw_to_ccu_nm(hw);
125 if (nm->common.features & CCU_FEATURE_FIXED_POSTDIV)
126 rate *= nm->fixed_post_div;
128 if (rate < nm->min_rate) {
130 if (nm->common.features & CCU_FEATURE_FIXED_POSTDIV)
131 rate /= nm->fixed_post_div;
135 if (nm->max_rate && rate > nm->max_rate) {
137 if (nm->common.features & CCU_FEATURE_FIXED_POSTDIV)
138 rate /= nm->fixed_post_div;
142 if (ccu_frac_helper_has_rate(&nm->common, &nm->frac, rate)) {
143 if (nm->common.features & CCU_FEATURE_FIXED_POSTDIV)
144 rate /= nm->fixed_post_div;
148 if (ccu_sdm_helper_has_rate(&nm->common, &nm->sdm, rate)) {
149 if (nm->common.features & CCU_FEATURE_FIXED_POSTDIV)
150 rate /= nm->fixed_post_div;
154 _nm.min_n = nm->n.min ?: 1;
155 _nm.max_n = nm->n.max ?: 1 << nm->n.width;
157 _nm.max_m = nm->m.max ?: 1 << nm->m.width;
159 rate = ccu_nm_find_best(&nm->common, *parent_rate, rate, &_nm);
161 if (nm->common.features & CCU_FEATURE_FIXED_POSTDIV)
162 rate /= nm->fixed_post_div;
167 static int ccu_nm_set_rate(struct clk_hw *hw, unsigned long rate,
168 unsigned long parent_rate)
170 struct ccu_nm *nm = hw_to_ccu_nm(hw);
175 /* Adjust target rate according to post-dividers */
176 if (nm->common.features & CCU_FEATURE_FIXED_POSTDIV)
177 rate = rate * nm->fixed_post_div;
179 if (ccu_frac_helper_has_rate(&nm->common, &nm->frac, rate)) {
180 spin_lock_irqsave(nm->common.lock, flags);
182 /* most SoCs require M to be 0 if fractional mode is used */
183 reg = readl(nm->common.base + nm->common.reg);
184 reg &= ~GENMASK(nm->m.width + nm->m.shift - 1, nm->m.shift);
185 writel(reg, nm->common.base + nm->common.reg);
187 spin_unlock_irqrestore(nm->common.lock, flags);
189 ccu_frac_helper_enable(&nm->common, &nm->frac);
191 return ccu_frac_helper_set_rate(&nm->common, &nm->frac,
194 ccu_frac_helper_disable(&nm->common, &nm->frac);
197 _nm.min_n = nm->n.min ?: 1;
198 _nm.max_n = nm->n.max ?: 1 << nm->n.width;
200 _nm.max_m = nm->m.max ?: 1 << nm->m.width;
202 if (ccu_sdm_helper_has_rate(&nm->common, &nm->sdm, rate)) {
203 ccu_sdm_helper_enable(&nm->common, &nm->sdm, rate);
205 /* Sigma delta modulation requires specific N and M factors */
206 ccu_sdm_helper_get_factors(&nm->common, &nm->sdm, rate,
209 ccu_sdm_helper_disable(&nm->common, &nm->sdm);
210 ccu_nm_find_best(&nm->common, parent_rate, rate, &_nm);
213 spin_lock_irqsave(nm->common.lock, flags);
215 reg = readl(nm->common.base + nm->common.reg);
216 reg &= ~GENMASK(nm->n.width + nm->n.shift - 1, nm->n.shift);
217 reg &= ~GENMASK(nm->m.width + nm->m.shift - 1, nm->m.shift);
219 reg |= (_nm.n - nm->n.offset) << nm->n.shift;
220 reg |= (_nm.m - nm->m.offset) << nm->m.shift;
221 writel(reg, nm->common.base + nm->common.reg);
223 spin_unlock_irqrestore(nm->common.lock, flags);
225 ccu_helper_wait_for_lock(&nm->common, nm->lock);
230 const struct clk_ops ccu_nm_ops = {
231 .disable = ccu_nm_disable,
232 .enable = ccu_nm_enable,
233 .is_enabled = ccu_nm_is_enabled,
235 .recalc_rate = ccu_nm_recalc_rate,
236 .round_rate = ccu_nm_round_rate,
237 .set_rate = ccu_nm_set_rate,
239 EXPORT_SYMBOL_NS_GPL(ccu_nm_ops, SUNXI_CCU);