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11#include <linux/clk-provider.h>
12
13#include "ccu_gate.h"
14#include "ccu_nkmp.h"
15
16struct _ccu_nkmp {
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;
21};
22
23static void ccu_nkmp_find_best(unsigned long parent, unsigned long rate,
24 struct _ccu_nkmp *nkmp)
25{
26 unsigned long best_rate = 0;
27 unsigned long best_n = 0, best_k = 0, best_m = 0, best_p = 0;
28 unsigned long _n, _k, _m, _p;
29
30 for (_k = nkmp->min_k; _k <= nkmp->max_k; _k++) {
31 for (_n = nkmp->min_n; _n <= nkmp->max_n; _n++) {
32 for (_m = nkmp->min_m; _m <= nkmp->max_m; _m++) {
33 for (_p = nkmp->min_p; _p <= nkmp->max_p; _p <<= 1) {
34 unsigned long tmp_rate;
35
36 tmp_rate = parent * _n * _k / (_m * _p);
37
38 if (tmp_rate > rate)
39 continue;
40
41 if ((rate - tmp_rate) < (rate - best_rate)) {
42 best_rate = tmp_rate;
43 best_n = _n;
44 best_k = _k;
45 best_m = _m;
46 best_p = _p;
47 }
48 }
49 }
50 }
51 }
52
53 nkmp->n = best_n;
54 nkmp->k = best_k;
55 nkmp->m = best_m;
56 nkmp->p = best_p;
57}
58
59static void ccu_nkmp_disable(struct clk_hw *hw)
60{
61 struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
62
63 return ccu_gate_helper_disable(&nkmp->common, nkmp->enable);
64}
65
66static int ccu_nkmp_enable(struct clk_hw *hw)
67{
68 struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
69
70 return ccu_gate_helper_enable(&nkmp->common, nkmp->enable);
71}
72
73static int ccu_nkmp_is_enabled(struct clk_hw *hw)
74{
75 struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
76
77 return ccu_gate_helper_is_enabled(&nkmp->common, nkmp->enable);
78}
79
80static unsigned long ccu_nkmp_recalc_rate(struct clk_hw *hw,
81 unsigned long parent_rate)
82{
83 struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
84 unsigned long n, m, k, p;
85 u32 reg;
86
87 reg = readl(nkmp->common.base + nkmp->common.reg);
88
89 n = reg >> nkmp->n.shift;
90 n &= (1 << nkmp->n.width) - 1;
91 n += nkmp->n.offset;
92 if (!n)
93 n++;
94
95 k = reg >> nkmp->k.shift;
96 k &= (1 << nkmp->k.width) - 1;
97 k += nkmp->k.offset;
98 if (!k)
99 k++;
100
101 m = reg >> nkmp->m.shift;
102 m &= (1 << nkmp->m.width) - 1;
103 m += nkmp->m.offset;
104 if (!m)
105 m++;
106
107 p = reg >> nkmp->p.shift;
108 p &= (1 << nkmp->p.width) - 1;
109
110 return (parent_rate * n * k >> p) / m;
111}
112
113static long ccu_nkmp_round_rate(struct clk_hw *hw, unsigned long rate,
114 unsigned long *parent_rate)
115{
116 struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
117 struct _ccu_nkmp _nkmp;
118
119 _nkmp.min_n = nkmp->n.min ?: 1;
120 _nkmp.max_n = nkmp->n.max ?: 1 << nkmp->n.width;
121 _nkmp.min_k = nkmp->k.min ?: 1;
122 _nkmp.max_k = nkmp->k.max ?: 1 << nkmp->k.width;
123 _nkmp.min_m = 1;
124 _nkmp.max_m = nkmp->m.max ?: 1 << nkmp->m.width;
125 _nkmp.min_p = 1;
126 _nkmp.max_p = nkmp->p.max ?: 1 << ((1 << nkmp->p.width) - 1);
127
128 ccu_nkmp_find_best(*parent_rate, rate, &_nkmp);
129
130 return *parent_rate * _nkmp.n * _nkmp.k / (_nkmp.m * _nkmp.p);
131}
132
133static int ccu_nkmp_set_rate(struct clk_hw *hw, unsigned long rate,
134 unsigned long parent_rate)
135{
136 struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
137 struct _ccu_nkmp _nkmp;
138 unsigned long flags;
139 u32 reg;
140
141 _nkmp.min_n = nkmp->n.min ?: 1;
142 _nkmp.max_n = nkmp->n.max ?: 1 << nkmp->n.width;
143 _nkmp.min_k = nkmp->k.min ?: 1;
144 _nkmp.max_k = nkmp->k.max ?: 1 << nkmp->k.width;
145 _nkmp.min_m = 1;
146 _nkmp.max_m = nkmp->m.max ?: 1 << nkmp->m.width;
147 _nkmp.min_p = 1;
148 _nkmp.max_p = nkmp->p.max ?: 1 << ((1 << nkmp->p.width) - 1);
149
150 ccu_nkmp_find_best(parent_rate, rate, &_nkmp);
151
152 spin_lock_irqsave(nkmp->common.lock, flags);
153
154 reg = readl(nkmp->common.base + nkmp->common.reg);
155 reg &= ~GENMASK(nkmp->n.width + nkmp->n.shift - 1, nkmp->n.shift);
156 reg &= ~GENMASK(nkmp->k.width + nkmp->k.shift - 1, nkmp->k.shift);
157 reg &= ~GENMASK(nkmp->m.width + nkmp->m.shift - 1, nkmp->m.shift);
158 reg &= ~GENMASK(nkmp->p.width + nkmp->p.shift - 1, nkmp->p.shift);
159
160 reg |= (_nkmp.n - nkmp->n.offset) << nkmp->n.shift;
161 reg |= (_nkmp.k - nkmp->k.offset) << nkmp->k.shift;
162 reg |= (_nkmp.m - nkmp->m.offset) << nkmp->m.shift;
163 reg |= ilog2(_nkmp.p) << nkmp->p.shift;
164
165 writel(reg, nkmp->common.base + nkmp->common.reg);
166
167 spin_unlock_irqrestore(nkmp->common.lock, flags);
168
169 ccu_helper_wait_for_lock(&nkmp->common, nkmp->lock);
170
171 return 0;
172}
173
174const struct clk_ops ccu_nkmp_ops = {
175 .disable = ccu_nkmp_disable,
176 .enable = ccu_nkmp_enable,
177 .is_enabled = ccu_nkmp_is_enabled,
178
179 .recalc_rate = ccu_nkmp_recalc_rate,
180 .round_rate = ccu_nkmp_round_rate,
181 .set_rate = ccu_nkmp_set_rate,
182};
183
