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11#include <linux/clk-provider.h>
12
13#include "ccu_gate.h"
14#include "ccu_nkm.h"
15
16struct _ccu_nkm {
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};
21
22static void ccu_nkm_find_best(unsigned long parent, unsigned long rate,
23 struct _ccu_nkm *nkm)
24{
25 unsigned long best_rate = 0;
26 unsigned long best_n = 0, best_k = 0, best_m = 0;
27 unsigned long _n, _k, _m;
28
29 for (_k = nkm->min_k; _k <= nkm->max_k; _k++) {
30 for (_n = nkm->min_n; _n <= nkm->max_n; _n++) {
31 for (_m = nkm->min_m; _m <= nkm->max_m; _m++) {
32 unsigned long tmp_rate;
33
34 tmp_rate = parent * _n * _k / _m;
35
36 if (tmp_rate > rate)
37 continue;
38 if ((rate - tmp_rate) < (rate - best_rate)) {
39 best_rate = tmp_rate;
40 best_n = _n;
41 best_k = _k;
42 best_m = _m;
43 }
44 }
45 }
46 }
47
48 nkm->n = best_n;
49 nkm->k = best_k;
50 nkm->m = best_m;
51}
52
53static void ccu_nkm_disable(struct clk_hw *hw)
54{
55 struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
56
57 return ccu_gate_helper_disable(&nkm->common, nkm->enable);
58}
59
60static int ccu_nkm_enable(struct clk_hw *hw)
61{
62 struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
63
64 return ccu_gate_helper_enable(&nkm->common, nkm->enable);
65}
66
67static int ccu_nkm_is_enabled(struct clk_hw *hw)
68{
69 struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
70
71 return ccu_gate_helper_is_enabled(&nkm->common, nkm->enable);
72}
73
74static unsigned long ccu_nkm_recalc_rate(struct clk_hw *hw,
75 unsigned long parent_rate)
76{
77 struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
78 unsigned long n, m, k, rate;
79 u32 reg;
80
81 reg = readl(nkm->common.base + nkm->common.reg);
82
83 n = reg >> nkm->n.shift;
84 n &= (1 << nkm->n.width) - 1;
85 n += nkm->n.offset;
86 if (!n)
87 n++;
88
89 k = reg >> nkm->k.shift;
90 k &= (1 << nkm->k.width) - 1;
91 k += nkm->k.offset;
92 if (!k)
93 k++;
94
95 m = reg >> nkm->m.shift;
96 m &= (1 << nkm->m.width) - 1;
97 m += nkm->m.offset;
98 if (!m)
99 m++;
100
101 rate = parent_rate * n * k / m;
102
103 if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
104 rate /= nkm->fixed_post_div;
105
106 return rate;
107}
108
109static unsigned long ccu_nkm_round_rate(struct ccu_mux_internal *mux,
110 struct clk_hw *hw,
111 unsigned long *parent_rate,
112 unsigned long rate,
113 void *data)
114{
115 struct ccu_nkm *nkm = data;
116 struct _ccu_nkm _nkm;
117
118 _nkm.min_n = nkm->n.min ?: 1;
119 _nkm.max_n = nkm->n.max ?: 1 << nkm->n.width;
120 _nkm.min_k = nkm->k.min ?: 1;
121 _nkm.max_k = nkm->k.max ?: 1 << nkm->k.width;
122 _nkm.min_m = 1;
123 _nkm.max_m = nkm->m.max ?: 1 << nkm->m.width;
124
125 if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
126 rate *= nkm->fixed_post_div;
127
128 ccu_nkm_find_best(*parent_rate, rate, &_nkm);
129
130 rate = *parent_rate * _nkm.n * _nkm.k / _nkm.m;
131
132 if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
133 rate /= nkm->fixed_post_div;
134
135 return rate;
136}
137
138static int ccu_nkm_determine_rate(struct clk_hw *hw,
139 struct clk_rate_request *req)
140{
141 struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
142
143 return ccu_mux_helper_determine_rate(&nkm->common, &nkm->mux,
144 req, ccu_nkm_round_rate, nkm);
145}
146
147static int ccu_nkm_set_rate(struct clk_hw *hw, unsigned long rate,
148 unsigned long parent_rate)
149{
150 struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
151 struct _ccu_nkm _nkm;
152 unsigned long flags;
153 u32 reg;
154
155 if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
156 rate *= nkm->fixed_post_div;
157
158 _nkm.min_n = nkm->n.min ?: 1;
159 _nkm.max_n = nkm->n.max ?: 1 << nkm->n.width;
160 _nkm.min_k = nkm->k.min ?: 1;
161 _nkm.max_k = nkm->k.max ?: 1 << nkm->k.width;
162 _nkm.min_m = 1;
163 _nkm.max_m = nkm->m.max ?: 1 << nkm->m.width;
164
165 ccu_nkm_find_best(parent_rate, rate, &_nkm);
166
167 spin_lock_irqsave(nkm->common.lock, flags);
168
169 reg = readl(nkm->common.base + nkm->common.reg);
170 reg &= ~GENMASK(nkm->n.width + nkm->n.shift - 1, nkm->n.shift);
171 reg &= ~GENMASK(nkm->k.width + nkm->k.shift - 1, nkm->k.shift);
172 reg &= ~GENMASK(nkm->m.width + nkm->m.shift - 1, nkm->m.shift);
173
174 reg |= (_nkm.n - nkm->n.offset) << nkm->n.shift;
175 reg |= (_nkm.k - nkm->k.offset) << nkm->k.shift;
176 reg |= (_nkm.m - nkm->m.offset) << nkm->m.shift;
177 writel(reg, nkm->common.base + nkm->common.reg);
178
179 spin_unlock_irqrestore(nkm->common.lock, flags);
180
181 ccu_helper_wait_for_lock(&nkm->common, nkm->lock);
182
183 return 0;
184}
185
186static u8 ccu_nkm_get_parent(struct clk_hw *hw)
187{
188 struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
189
190 return ccu_mux_helper_get_parent(&nkm->common, &nkm->mux);
191}
192
193static int ccu_nkm_set_parent(struct clk_hw *hw, u8 index)
194{
195 struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
196
197 return ccu_mux_helper_set_parent(&nkm->common, &nkm->mux, index);
198}
199
200const struct clk_ops ccu_nkm_ops = {
201 .disable = ccu_nkm_disable,
202 .enable = ccu_nkm_enable,
203 .is_enabled = ccu_nkm_is_enabled,
204
205 .get_parent = ccu_nkm_get_parent,
206 .set_parent = ccu_nkm_set_parent,
207
208 .determine_rate = ccu_nkm_determine_rate,
209 .recalc_rate = ccu_nkm_recalc_rate,
210 .set_rate = ccu_nkm_set_rate,
211};
212
