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17#include <linux/module.h>
18#include <linux/kernel.h>
19
20#include <asm/hardware/icst.h>
21
22
23
24
25const unsigned char icst307_s2div[8] = { 10, 2, 8, 4, 5, 7, 3, 6 };
26const unsigned char icst525_s2div[8] = { 10, 2, 8, 4, 5, 7, 9, 6 };
27EXPORT_SYMBOL(icst307_s2div);
28EXPORT_SYMBOL(icst525_s2div);
29
30unsigned long icst_hz(const struct icst_params *p, struct icst_vco vco)
31{
32 return p->ref * 2 * (vco.v + 8) / ((vco.r + 2) * p->s2div[vco.s]);
33}
34
35EXPORT_SYMBOL(icst_hz);
36
37
38
39
40const unsigned char icst307_idx2s[8] = { 1, 6, 3, 4, 7, 5, 2, 0 };
41const unsigned char icst525_idx2s[8] = { 1, 3, 4, 7, 5, 2, 6, 0 };
42EXPORT_SYMBOL(icst307_idx2s);
43EXPORT_SYMBOL(icst525_idx2s);
44
45struct icst_vco
46icst_hz_to_vco(const struct icst_params *p, unsigned long freq)
47{
48 struct icst_vco vco = { .s = 1, .v = p->vd_max, .r = p->rd_max };
49 unsigned long f;
50 unsigned int i = 0, rd, best = (unsigned int)-1;
51
52
53
54
55
56 do {
57 f = freq * p->s2div[p->idx2s[i]];
58
59 if (f > p->vco_min && f <= p->vco_max)
60 break;
61 } while (i < 8);
62
63 if (i >= 8)
64 return vco;
65
66 vco.s = p->idx2s[i];
67
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69
70
71
72 for (rd = p->rd_min; rd <= p->rd_max; rd++) {
73 unsigned long fref_div, f_pll;
74 unsigned int vd;
75 int f_diff;
76
77 fref_div = (2 * p->ref) / rd;
78
79 vd = (f + fref_div / 2) / fref_div;
80 if (vd < p->vd_min || vd > p->vd_max)
81 continue;
82
83 f_pll = fref_div * vd;
84 f_diff = f_pll - f;
85 if (f_diff < 0)
86 f_diff = -f_diff;
87
88 if ((unsigned)f_diff < best) {
89 vco.v = vd - 8;
90 vco.r = rd - 2;
91 if (f_diff == 0)
92 break;
93 best = f_diff;
94 }
95 }
96
97 return vco;
98}
99
100EXPORT_SYMBOL(icst_hz_to_vco);
101