This source file includes following definitions.
- ccu_nkmp_calc_rate
- ccu_nkmp_find_best
- ccu_nkmp_disable
- ccu_nkmp_enable
- ccu_nkmp_is_enabled
- ccu_nkmp_recalc_rate
- ccu_nkmp_round_rate
- ccu_nkmp_set_rate
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7 #include <linux/clk-provider.h>
8 #include <linux/io.h>
9
10 #include "ccu_gate.h"
11 #include "ccu_nkmp.h"
12
13 struct _ccu_nkmp {
14 unsigned long n, min_n, max_n;
15 unsigned long k, min_k, max_k;
16 unsigned long m, min_m, max_m;
17 unsigned long p, min_p, max_p;
18 };
19
20 static unsigned long ccu_nkmp_calc_rate(unsigned long parent,
21 unsigned long n, unsigned long k,
22 unsigned long m, unsigned long p)
23 {
24 u64 rate = parent;
25
26 rate *= n * k;
27 do_div(rate, m * p);
28
29 return rate;
30 }
31
32 static void ccu_nkmp_find_best(unsigned long parent, unsigned long rate,
33 struct _ccu_nkmp *nkmp)
34 {
35 unsigned long best_rate = 0;
36 unsigned long best_n = 0, best_k = 0, best_m = 0, best_p = 0;
37 unsigned long _n, _k, _m, _p;
38
39 for (_k = nkmp->min_k; _k <= nkmp->max_k; _k++) {
40 for (_n = nkmp->min_n; _n <= nkmp->max_n; _n++) {
41 for (_m = nkmp->min_m; _m <= nkmp->max_m; _m++) {
42 for (_p = nkmp->min_p; _p <= nkmp->max_p; _p <<= 1) {
43 unsigned long tmp_rate;
44
45 tmp_rate = ccu_nkmp_calc_rate(parent,
46 _n, _k,
47 _m, _p);
48
49 if (tmp_rate > rate)
50 continue;
51
52 if ((rate - tmp_rate) < (rate - best_rate)) {
53 best_rate = tmp_rate;
54 best_n = _n;
55 best_k = _k;
56 best_m = _m;
57 best_p = _p;
58 }
59 }
60 }
61 }
62 }
63
64 nkmp->n = best_n;
65 nkmp->k = best_k;
66 nkmp->m = best_m;
67 nkmp->p = best_p;
68 }
69
70 static void ccu_nkmp_disable(struct clk_hw *hw)
71 {
72 struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
73
74 return ccu_gate_helper_disable(&nkmp->common, nkmp->enable);
75 }
76
77 static int ccu_nkmp_enable(struct clk_hw *hw)
78 {
79 struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
80
81 return ccu_gate_helper_enable(&nkmp->common, nkmp->enable);
82 }
83
84 static int ccu_nkmp_is_enabled(struct clk_hw *hw)
85 {
86 struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
87
88 return ccu_gate_helper_is_enabled(&nkmp->common, nkmp->enable);
89 }
90
91 static unsigned long ccu_nkmp_recalc_rate(struct clk_hw *hw,
92 unsigned long parent_rate)
93 {
94 struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
95 unsigned long n, m, k, p, rate;
96 u32 reg;
97
98 reg = readl(nkmp->common.base + nkmp->common.reg);
99
100 n = reg >> nkmp->n.shift;
101 n &= (1 << nkmp->n.width) - 1;
102 n += nkmp->n.offset;
103 if (!n)
104 n++;
105
106 k = reg >> nkmp->k.shift;
107 k &= (1 << nkmp->k.width) - 1;
108 k += nkmp->k.offset;
109 if (!k)
110 k++;
111
112 m = reg >> nkmp->m.shift;
113 m &= (1 << nkmp->m.width) - 1;
114 m += nkmp->m.offset;
115 if (!m)
116 m++;
117
118 p = reg >> nkmp->p.shift;
119 p &= (1 << nkmp->p.width) - 1;
120
121 rate = ccu_nkmp_calc_rate(parent_rate, n, k, m, 1 << p);
122 if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
123 rate /= nkmp->fixed_post_div;
124
125 return rate;
126 }
127
128 static long ccu_nkmp_round_rate(struct clk_hw *hw, unsigned long rate,
129 unsigned long *parent_rate)
130 {
131 struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
132 struct _ccu_nkmp _nkmp;
133
134 if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
135 rate *= nkmp->fixed_post_div;
136
137 if (nkmp->max_rate && rate > nkmp->max_rate) {
138 rate = nkmp->max_rate;
139 if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
140 rate /= nkmp->fixed_post_div;
141 return rate;
142 }
143
144 _nkmp.min_n = nkmp->n.min ?: 1;
145 _nkmp.max_n = nkmp->n.max ?: 1 << nkmp->n.width;
146 _nkmp.min_k = nkmp->k.min ?: 1;
147 _nkmp.max_k = nkmp->k.max ?: 1 << nkmp->k.width;
148 _nkmp.min_m = 1;
149 _nkmp.max_m = nkmp->m.max ?: 1 << nkmp->m.width;
150 _nkmp.min_p = 1;
151 _nkmp.max_p = nkmp->p.max ?: 1 << ((1 << nkmp->p.width) - 1);
152
153 ccu_nkmp_find_best(*parent_rate, rate, &_nkmp);
154
155 rate = ccu_nkmp_calc_rate(*parent_rate, _nkmp.n, _nkmp.k,
156 _nkmp.m, _nkmp.p);
157 if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
158 rate = rate / nkmp->fixed_post_div;
159
160 return rate;
161 }
162
163 static int ccu_nkmp_set_rate(struct clk_hw *hw, unsigned long rate,
164 unsigned long parent_rate)
165 {
166 struct ccu_nkmp *nkmp = hw_to_ccu_nkmp(hw);
167 u32 n_mask = 0, k_mask = 0, m_mask = 0, p_mask = 0;
168 struct _ccu_nkmp _nkmp;
169 unsigned long flags;
170 u32 reg;
171
172 if (nkmp->common.features & CCU_FEATURE_FIXED_POSTDIV)
173 rate = rate * nkmp->fixed_post_div;
174
175 _nkmp.min_n = nkmp->n.min ?: 1;
176 _nkmp.max_n = nkmp->n.max ?: 1 << nkmp->n.width;
177 _nkmp.min_k = nkmp->k.min ?: 1;
178 _nkmp.max_k = nkmp->k.max ?: 1 << nkmp->k.width;
179 _nkmp.min_m = 1;
180 _nkmp.max_m = nkmp->m.max ?: 1 << nkmp->m.width;
181 _nkmp.min_p = 1;
182 _nkmp.max_p = nkmp->p.max ?: 1 << ((1 << nkmp->p.width) - 1);
183
184 ccu_nkmp_find_best(parent_rate, rate, &_nkmp);
185
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189
190
191
192 if (nkmp->n.width)
193 n_mask = GENMASK(nkmp->n.width + nkmp->n.shift - 1,
194 nkmp->n.shift);
195 if (nkmp->k.width)
196 k_mask = GENMASK(nkmp->k.width + nkmp->k.shift - 1,
197 nkmp->k.shift);
198 if (nkmp->m.width)
199 m_mask = GENMASK(nkmp->m.width + nkmp->m.shift - 1,
200 nkmp->m.shift);
201 if (nkmp->p.width)
202 p_mask = GENMASK(nkmp->p.width + nkmp->p.shift - 1,
203 nkmp->p.shift);
204
205 spin_lock_irqsave(nkmp->common.lock, flags);
206
207 reg = readl(nkmp->common.base + nkmp->common.reg);
208 reg &= ~(n_mask | k_mask | m_mask | p_mask);
209
210 reg |= ((_nkmp.n - nkmp->n.offset) << nkmp->n.shift) & n_mask;
211 reg |= ((_nkmp.k - nkmp->k.offset) << nkmp->k.shift) & k_mask;
212 reg |= ((_nkmp.m - nkmp->m.offset) << nkmp->m.shift) & m_mask;
213 reg |= (ilog2(_nkmp.p) << nkmp->p.shift) & p_mask;
214
215 writel(reg, nkmp->common.base + nkmp->common.reg);
216
217 spin_unlock_irqrestore(nkmp->common.lock, flags);
218
219 ccu_helper_wait_for_lock(&nkmp->common, nkmp->lock);
220
221 return 0;
222 }
223
224 const struct clk_ops ccu_nkmp_ops = {
225 .disable = ccu_nkmp_disable,
226 .enable = ccu_nkmp_enable,
227 .is_enabled = ccu_nkmp_is_enabled,
228
229 .recalc_rate = ccu_nkmp_recalc_rate,
230 .round_rate = ccu_nkmp_round_rate,
231 .set_rate = ccu_nkmp_set_rate,
232 };