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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;
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 return parent_rate * n * k / m;
102}
103
104static unsigned long ccu_nkm_round_rate(struct ccu_mux_internal *mux,
105 struct clk_hw *hw,
106 unsigned long *parent_rate,
107 unsigned long rate,
108 void *data)
109{
110 struct ccu_nkm *nkm = data;
111 struct _ccu_nkm _nkm;
112
113 _nkm.min_n = nkm->n.min ?: 1;
114 _nkm.max_n = nkm->n.max ?: 1 << nkm->n.width;
115 _nkm.min_k = nkm->k.min ?: 1;
116 _nkm.max_k = nkm->k.max ?: 1 << nkm->k.width;
117 _nkm.min_m = 1;
118 _nkm.max_m = nkm->m.max ?: 1 << nkm->m.width;
119
120 ccu_nkm_find_best(*parent_rate, rate, &_nkm);
121
122 return *parent_rate * _nkm.n * _nkm.k / _nkm.m;
123}
124
125static int ccu_nkm_determine_rate(struct clk_hw *hw,
126 struct clk_rate_request *req)
127{
128 struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
129
130 return ccu_mux_helper_determine_rate(&nkm->common, &nkm->mux,
131 req, ccu_nkm_round_rate, nkm);
132}
133
134static int ccu_nkm_set_rate(struct clk_hw *hw, unsigned long rate,
135 unsigned long parent_rate)
136{
137 struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
138 struct _ccu_nkm _nkm;
139 unsigned long flags;
140 u32 reg;
141
142 _nkm.min_n = nkm->n.min ?: 1;
143 _nkm.max_n = nkm->n.max ?: 1 << nkm->n.width;
144 _nkm.min_k = nkm->k.min ?: 1;
145 _nkm.max_k = nkm->k.max ?: 1 << nkm->k.width;
146 _nkm.min_m = 1;
147 _nkm.max_m = nkm->m.max ?: 1 << nkm->m.width;
148
149 ccu_nkm_find_best(parent_rate, rate, &_nkm);
150
151 spin_lock_irqsave(nkm->common.lock, flags);
152
153 reg = readl(nkm->common.base + nkm->common.reg);
154 reg &= ~GENMASK(nkm->n.width + nkm->n.shift - 1, nkm->n.shift);
155 reg &= ~GENMASK(nkm->k.width + nkm->k.shift - 1, nkm->k.shift);
156 reg &= ~GENMASK(nkm->m.width + nkm->m.shift - 1, nkm->m.shift);
157
158 reg |= (_nkm.n - nkm->n.offset) << nkm->n.shift;
159 reg |= (_nkm.k - nkm->k.offset) << nkm->k.shift;
160 reg |= (_nkm.m - nkm->m.offset) << nkm->m.shift;
161 writel(reg, nkm->common.base + nkm->common.reg);
162
163 spin_unlock_irqrestore(nkm->common.lock, flags);
164
165 ccu_helper_wait_for_lock(&nkm->common, nkm->lock);
166
167 return 0;
168}
169
170static u8 ccu_nkm_get_parent(struct clk_hw *hw)
171{
172 struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
173
174 return ccu_mux_helper_get_parent(&nkm->common, &nkm->mux);
175}
176
177static int ccu_nkm_set_parent(struct clk_hw *hw, u8 index)
178{
179 struct ccu_nkm *nkm = hw_to_ccu_nkm(hw);
180
181 return ccu_mux_helper_set_parent(&nkm->common, &nkm->mux, index);
182}
183
184const struct clk_ops ccu_nkm_ops = {
185 .disable = ccu_nkm_disable,
186 .enable = ccu_nkm_enable,
187 .is_enabled = ccu_nkm_is_enabled,
188
189 .get_parent = ccu_nkm_get_parent,
190 .set_parent = ccu_nkm_set_parent,
191
192 .determine_rate = ccu_nkm_determine_rate,
193 .recalc_rate = ccu_nkm_recalc_rate,
194 .set_rate = ccu_nkm_set_rate,
195};
196
