This source file includes following definitions.
- ccu_nk_find_best
- ccu_nk_disable
- ccu_nk_enable
- ccu_nk_is_enabled
- ccu_nk_recalc_rate
- ccu_nk_round_rate
- ccu_nk_set_rate
1
2
3
4
5
6
7 #include <linux/clk-provider.h>
8 #include <linux/io.h>
9
10 #include "ccu_gate.h"
11 #include "ccu_nk.h"
12
13 struct _ccu_nk {
14 unsigned long n, min_n, max_n;
15 unsigned long k, min_k, max_k;
16 };
17
18 static void ccu_nk_find_best(unsigned long parent, unsigned long rate,
19 struct _ccu_nk *nk)
20 {
21 unsigned long best_rate = 0;
22 unsigned int best_k = 0, best_n = 0;
23 unsigned int _k, _n;
24
25 for (_k = nk->min_k; _k <= nk->max_k; _k++) {
26 for (_n = nk->min_n; _n <= nk->max_n; _n++) {
27 unsigned long tmp_rate = parent * _n * _k;
28
29 if (tmp_rate > rate)
30 continue;
31
32 if ((rate - tmp_rate) < (rate - best_rate)) {
33 best_rate = tmp_rate;
34 best_k = _k;
35 best_n = _n;
36 }
37 }
38 }
39
40 nk->k = best_k;
41 nk->n = best_n;
42 }
43
44 static void ccu_nk_disable(struct clk_hw *hw)
45 {
46 struct ccu_nk *nk = hw_to_ccu_nk(hw);
47
48 return ccu_gate_helper_disable(&nk->common, nk->enable);
49 }
50
51 static int ccu_nk_enable(struct clk_hw *hw)
52 {
53 struct ccu_nk *nk = hw_to_ccu_nk(hw);
54
55 return ccu_gate_helper_enable(&nk->common, nk->enable);
56 }
57
58 static int ccu_nk_is_enabled(struct clk_hw *hw)
59 {
60 struct ccu_nk *nk = hw_to_ccu_nk(hw);
61
62 return ccu_gate_helper_is_enabled(&nk->common, nk->enable);
63 }
64
65 static unsigned long ccu_nk_recalc_rate(struct clk_hw *hw,
66 unsigned long parent_rate)
67 {
68 struct ccu_nk *nk = hw_to_ccu_nk(hw);
69 unsigned long rate, n, k;
70 u32 reg;
71
72 reg = readl(nk->common.base + nk->common.reg);
73
74 n = reg >> nk->n.shift;
75 n &= (1 << nk->n.width) - 1;
76 n += nk->n.offset;
77 if (!n)
78 n++;
79
80 k = reg >> nk->k.shift;
81 k &= (1 << nk->k.width) - 1;
82 k += nk->k.offset;
83 if (!k)
84 k++;
85
86 rate = parent_rate * n * k;
87 if (nk->common.features & CCU_FEATURE_FIXED_POSTDIV)
88 rate /= nk->fixed_post_div;
89
90 return rate;
91 }
92
93 static long ccu_nk_round_rate(struct clk_hw *hw, unsigned long rate,
94 unsigned long *parent_rate)
95 {
96 struct ccu_nk *nk = hw_to_ccu_nk(hw);
97 struct _ccu_nk _nk;
98
99 if (nk->common.features & CCU_FEATURE_FIXED_POSTDIV)
100 rate *= nk->fixed_post_div;
101
102 _nk.min_n = nk->n.min ?: 1;
103 _nk.max_n = nk->n.max ?: 1 << nk->n.width;
104 _nk.min_k = nk->k.min ?: 1;
105 _nk.max_k = nk->k.max ?: 1 << nk->k.width;
106
107 ccu_nk_find_best(*parent_rate, rate, &_nk);
108 rate = *parent_rate * _nk.n * _nk.k;
109
110 if (nk->common.features & CCU_FEATURE_FIXED_POSTDIV)
111 rate = rate / nk->fixed_post_div;
112
113 return rate;
114 }
115
116 static int ccu_nk_set_rate(struct clk_hw *hw, unsigned long rate,
117 unsigned long parent_rate)
118 {
119 struct ccu_nk *nk = hw_to_ccu_nk(hw);
120 unsigned long flags;
121 struct _ccu_nk _nk;
122 u32 reg;
123
124 if (nk->common.features & CCU_FEATURE_FIXED_POSTDIV)
125 rate = rate * nk->fixed_post_div;
126
127 _nk.min_n = nk->n.min ?: 1;
128 _nk.max_n = nk->n.max ?: 1 << nk->n.width;
129 _nk.min_k = nk->k.min ?: 1;
130 _nk.max_k = nk->k.max ?: 1 << nk->k.width;
131
132 ccu_nk_find_best(parent_rate, rate, &_nk);
133
134 spin_lock_irqsave(nk->common.lock, flags);
135
136 reg = readl(nk->common.base + nk->common.reg);
137 reg &= ~GENMASK(nk->n.width + nk->n.shift - 1, nk->n.shift);
138 reg &= ~GENMASK(nk->k.width + nk->k.shift - 1, nk->k.shift);
139
140 reg |= (_nk.k - nk->k.offset) << nk->k.shift;
141 reg |= (_nk.n - nk->n.offset) << nk->n.shift;
142 writel(reg, nk->common.base + nk->common.reg);
143
144 spin_unlock_irqrestore(nk->common.lock, flags);
145
146 ccu_helper_wait_for_lock(&nk->common, nk->lock);
147
148 return 0;
149 }
150
151 const struct clk_ops ccu_nk_ops = {
152 .disable = ccu_nk_disable,
153 .enable = ccu_nk_enable,
154 .is_enabled = ccu_nk_is_enabled,
155
156 .recalc_rate = ccu_nk_recalc_rate,
157 .round_rate = ccu_nk_round_rate,
158 .set_rate = ccu_nk_set_rate,
159 };