Warning: That file was not part of the compilation database. It may have many parsing errors.

1/*
2 * Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 */
10
11#include <linux/clk-provider.h>
12#include <linux/clkdev.h>
13#include <linux/clk/at91_pmc.h>
14#include <linux/of.h>
15#include <linux/mfd/syscon.h>
16#include <linux/regmap.h>
17
18#include "pmc.h"
19
20#define to_clk_plldiv(hw) container_of(hw, struct clk_plldiv, hw)
21
22struct clk_plldiv {
23 struct clk_hw hw;
24 struct regmap *regmap;
25};
26
27static unsigned long clk_plldiv_recalc_rate(struct clk_hw *hw,
28 unsigned long parent_rate)
29{
30 struct clk_plldiv *plldiv = to_clk_plldiv(hw);
31 unsigned int mckr;
32
33 regmap_read(plldiv->regmap, AT91_PMC_MCKR, &mckr);
34
35 if (mckr & AT91_PMC_PLLADIV2)
36 return parent_rate / 2;
37
38 return parent_rate;
39}
40
41static long clk_plldiv_round_rate(struct clk_hw *hw, unsigned long rate,
42 unsigned long *parent_rate)
43{
44 unsigned long div;
45
46 if (rate > *parent_rate)
47 return *parent_rate;
48 div = *parent_rate / 2;
49 if (rate < div)
50 return div;
51
52 if (rate - div < *parent_rate - rate)
53 return div;
54
55 return *parent_rate;
56}
57
58static int clk_plldiv_set_rate(struct clk_hw *hw, unsigned long rate,
59 unsigned long parent_rate)
60{
61 struct clk_plldiv *plldiv = to_clk_plldiv(hw);
62
63 if ((parent_rate != rate) && (parent_rate / 2 != rate))
64 return -EINVAL;
65
66 regmap_update_bits(plldiv->regmap, AT91_PMC_MCKR, AT91_PMC_PLLADIV2,
67 parent_rate != rate ? AT91_PMC_PLLADIV2 : 0);
68
69 return 0;
70}
71
72static const struct clk_ops plldiv_ops = {
73 .recalc_rate = clk_plldiv_recalc_rate,
74 .round_rate = clk_plldiv_round_rate,
75 .set_rate = clk_plldiv_set_rate,
76};
77
78struct clk_hw * __init
79at91_clk_register_plldiv(struct regmap *regmap, const char *name,
80 const char *parent_name)
81{
82 struct clk_plldiv *plldiv;
83 struct clk_hw *hw;
84 struct clk_init_data init;
85 int ret;
86
87 plldiv = kzalloc(sizeof(*plldiv), GFP_KERNEL);
88 if (!plldiv)
89 return ERR_PTR(-ENOMEM);
90
91 init.name = name;
92 init.ops = &plldiv_ops;
93 init.parent_names = parent_name ? &parent_name : NULL;
94 init.num_parents = parent_name ? 1 : 0;
95 init.flags = CLK_SET_RATE_GATE;
96
97 plldiv->hw.init = &init;
98 plldiv->regmap = regmap;
99
100 hw = &plldiv->hw;
101 ret = clk_hw_register(NULL, &plldiv->hw);
102 if (ret) {
103 kfree(plldiv);
104 hw = ERR_PTR(ret);
105 }
106
107 return hw;
108}
109

Warning: That file was not part of the compilation database. It may have many parsing errors.