clk-frac.c (f01387d2693813eb5271a3448e6a082322c7d75d) clk-frac.c (2bd1e256e45052f2244403f822fd85aa64a6aa00)
1/*
2 * mmp factor clock operation source file
3 *
4 * Copyright (C) 2012 Marvell
5 * Chao Xie <xiechao.mail@gmail.com>
6 *
7 * This file is licensed under the terms of the GNU General Public
8 * License version 2. This program is licensed "as is" without any

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17#include "clk.h"
18/*
19 * It is M/N clock
20 *
21 * Fout from synthesizer can be given from two equations:
22 * numerator/denominator = Fin / (Fout * factor)
23 */
24
1/*
2 * mmp factor clock operation source file
3 *
4 * Copyright (C) 2012 Marvell
5 * Chao Xie <xiechao.mail@gmail.com>
6 *
7 * This file is licensed under the terms of the GNU General Public
8 * License version 2. This program is licensed "as is" without any

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17#include "clk.h"
18/*
19 * It is M/N clock
20 *
21 * Fout from synthesizer can be given from two equations:
22 * numerator/denominator = Fin / (Fout * factor)
23 */
24
25#define to_clk_factor(hw) container_of(hw, struct clk_factor, hw)
26struct clk_factor {
25#define to_clk_factor(hw) container_of(hw, struct mmp_clk_factor, hw)
26struct mmp_clk_factor {
27 struct clk_hw hw;
28 void __iomem *base;
27 struct clk_hw hw;
28 void __iomem *base;
29 struct clk_factor_masks *masks;
30 struct clk_factor_tbl *ftbl;
29 struct mmp_clk_factor_masks *masks;
30 struct mmp_clk_factor_tbl *ftbl;
31 unsigned int ftbl_cnt;
32};
33
34static long clk_factor_round_rate(struct clk_hw *hw, unsigned long drate,
35 unsigned long *prate)
36{
31 unsigned int ftbl_cnt;
32};
33
34static long clk_factor_round_rate(struct clk_hw *hw, unsigned long drate,
35 unsigned long *prate)
36{
37 struct clk_factor *factor = to_clk_factor(hw);
37 struct mmp_clk_factor *factor = to_clk_factor(hw);
38 unsigned long rate = 0, prev_rate;
39 int i;
40
41 for (i = 0; i < factor->ftbl_cnt; i++) {
42 prev_rate = rate;
43 rate = (((*prate / 10000) * factor->ftbl[i].den) /
44 (factor->ftbl[i].num * factor->masks->factor)) * 10000;
45 if (rate > drate)

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53 else
54 return prev_rate;
55 }
56}
57
58static unsigned long clk_factor_recalc_rate(struct clk_hw *hw,
59 unsigned long parent_rate)
60{
38 unsigned long rate = 0, prev_rate;
39 int i;
40
41 for (i = 0; i < factor->ftbl_cnt; i++) {
42 prev_rate = rate;
43 rate = (((*prate / 10000) * factor->ftbl[i].den) /
44 (factor->ftbl[i].num * factor->masks->factor)) * 10000;
45 if (rate > drate)

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53 else
54 return prev_rate;
55 }
56}
57
58static unsigned long clk_factor_recalc_rate(struct clk_hw *hw,
59 unsigned long parent_rate)
60{
61 struct clk_factor *factor = to_clk_factor(hw);
62 struct clk_factor_masks *masks = factor->masks;
61 struct mmp_clk_factor *factor = to_clk_factor(hw);
62 struct mmp_clk_factor_masks *masks = factor->masks;
63 unsigned int val, num, den;
64
65 val = readl_relaxed(factor->base);
66
67 /* calculate numerator */
68 num = (val >> masks->num_shift) & masks->num_mask;
69
70 /* calculate denominator */

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76 return (((parent_rate / 10000) * den) /
77 (num * factor->masks->factor)) * 10000;
78}
79
80/* Configures new clock rate*/
81static int clk_factor_set_rate(struct clk_hw *hw, unsigned long drate,
82 unsigned long prate)
83{
63 unsigned int val, num, den;
64
65 val = readl_relaxed(factor->base);
66
67 /* calculate numerator */
68 num = (val >> masks->num_shift) & masks->num_mask;
69
70 /* calculate denominator */

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76 return (((parent_rate / 10000) * den) /
77 (num * factor->masks->factor)) * 10000;
78}
79
80/* Configures new clock rate*/
81static int clk_factor_set_rate(struct clk_hw *hw, unsigned long drate,
82 unsigned long prate)
83{
84 struct clk_factor *factor = to_clk_factor(hw);
85 struct clk_factor_masks *masks = factor->masks;
84 struct mmp_clk_factor *factor = to_clk_factor(hw);
85 struct mmp_clk_factor_masks *masks = factor->masks;
86 int i;
87 unsigned long val;
88 unsigned long prev_rate, rate = 0;
89
90 for (i = 0; i < factor->ftbl_cnt; i++) {
91 prev_rate = rate;
92 rate = (((prate / 10000) * factor->ftbl[i].den) /
93 (factor->ftbl[i].num * factor->masks->factor)) * 10000;

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113static struct clk_ops clk_factor_ops = {
114 .recalc_rate = clk_factor_recalc_rate,
115 .round_rate = clk_factor_round_rate,
116 .set_rate = clk_factor_set_rate,
117};
118
119struct clk *mmp_clk_register_factor(const char *name, const char *parent_name,
120 unsigned long flags, void __iomem *base,
86 int i;
87 unsigned long val;
88 unsigned long prev_rate, rate = 0;
89
90 for (i = 0; i < factor->ftbl_cnt; i++) {
91 prev_rate = rate;
92 rate = (((prate / 10000) * factor->ftbl[i].den) /
93 (factor->ftbl[i].num * factor->masks->factor)) * 10000;

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113static struct clk_ops clk_factor_ops = {
114 .recalc_rate = clk_factor_recalc_rate,
115 .round_rate = clk_factor_round_rate,
116 .set_rate = clk_factor_set_rate,
117};
118
119struct clk *mmp_clk_register_factor(const char *name, const char *parent_name,
120 unsigned long flags, void __iomem *base,
121 struct clk_factor_masks *masks, struct clk_factor_tbl *ftbl,
121 struct mmp_clk_factor_masks *masks,
122 struct mmp_clk_factor_tbl *ftbl,
122 unsigned int ftbl_cnt)
123{
123 unsigned int ftbl_cnt)
124{
124 struct clk_factor *factor;
125 struct mmp_clk_factor *factor;
125 struct clk_init_data init;
126 struct clk *clk;
127
128 if (!masks) {
129 pr_err("%s: must pass a clk_factor_mask\n", __func__);
130 return ERR_PTR(-EINVAL);
131 }
132

--- 25 unchanged lines hidden --- 		126 struct clk_init_data init;
127 struct clk *clk;
128
129 if (!masks) {
130 pr_err("%s: must pass a clk_factor_mask\n", __func__);
131 return ERR_PTR(-EINVAL);
132 }
133

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