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 SMD_DIV_SHIFT 8
21#define SMD_MAX_DIV 0xf
22
23struct at91sam9x5_clk_smd {
24 struct clk_hw hw;
25 struct regmap *regmap;
26};
27
28#define to_at91sam9x5_clk_smd(hw) \
29 container_of(hw, struct at91sam9x5_clk_smd, hw)
30
31static unsigned long at91sam9x5_clk_smd_recalc_rate(struct clk_hw *hw,
32 unsigned long parent_rate)
33{
34 struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw);
35 unsigned int smdr;
36 u8 smddiv;
37
38 regmap_read(smd->regmap, AT91_PMC_SMD, &smdr);
39 smddiv = (smdr & AT91_PMC_SMD_DIV) >> SMD_DIV_SHIFT;
40
41 return parent_rate / (smddiv + 1);
42}
43
44static long at91sam9x5_clk_smd_round_rate(struct clk_hw *hw, unsigned long rate,
45 unsigned long *parent_rate)
46{
47 unsigned long div;
48 unsigned long bestrate;
49 unsigned long tmp;
50
51 if (rate >= *parent_rate)
52 return *parent_rate;
53
54 div = *parent_rate / rate;
55 if (div > SMD_MAX_DIV)
56 return *parent_rate / (SMD_MAX_DIV + 1);
57
58 bestrate = *parent_rate / div;
59 tmp = *parent_rate / (div + 1);
60 if (bestrate - rate > rate - tmp)
61 bestrate = tmp;
62
63 return bestrate;
64}
65
66static int at91sam9x5_clk_smd_set_parent(struct clk_hw *hw, u8 index)
67{
68 struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw);
69
70 if (index > 1)
71 return -EINVAL;
72
73 regmap_update_bits(smd->regmap, AT91_PMC_SMD, AT91_PMC_SMDS,
74 index ? AT91_PMC_SMDS : 0);
75
76 return 0;
77}
78
79static u8 at91sam9x5_clk_smd_get_parent(struct clk_hw *hw)
80{
81 struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw);
82 unsigned int smdr;
83
84 regmap_read(smd->regmap, AT91_PMC_SMD, &smdr);
85
86 return smdr & AT91_PMC_SMDS;
87}
88
89static int at91sam9x5_clk_smd_set_rate(struct clk_hw *hw, unsigned long rate,
90 unsigned long parent_rate)
91{
92 struct at91sam9x5_clk_smd *smd = to_at91sam9x5_clk_smd(hw);
93 unsigned long div = parent_rate / rate;
94
95 if (parent_rate % rate || div < 1 || div > (SMD_MAX_DIV + 1))
96 return -EINVAL;
97
98 regmap_update_bits(smd->regmap, AT91_PMC_SMD, AT91_PMC_SMD_DIV,
99 (div - 1) << SMD_DIV_SHIFT);
100
101 return 0;
102}
103
104static const struct clk_ops at91sam9x5_smd_ops = {
105 .recalc_rate = at91sam9x5_clk_smd_recalc_rate,
106 .round_rate = at91sam9x5_clk_smd_round_rate,
107 .get_parent = at91sam9x5_clk_smd_get_parent,
108 .set_parent = at91sam9x5_clk_smd_set_parent,
109 .set_rate = at91sam9x5_clk_smd_set_rate,
110};
111
112struct clk_hw * __init
113at91sam9x5_clk_register_smd(struct regmap *regmap, const char *name,
114 const char **parent_names, u8 num_parents)
115{
116 struct at91sam9x5_clk_smd *smd;
117 struct clk_hw *hw;
118 struct clk_init_data init;
119 int ret;
120
121 smd = kzalloc(sizeof(*smd), GFP_KERNEL);
122 if (!smd)
123 return ERR_PTR(-ENOMEM);
124
125 init.name = name;
126 init.ops = &at91sam9x5_smd_ops;
127 init.parent_names = parent_names;
128 init.num_parents = num_parents;
129 init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE;
130
131 smd->hw.init = &init;
132 smd->regmap = regmap;
133
134 hw = &smd->hw;
135 ret = clk_hw_register(NULL, &smd->hw);
136 if (ret) {
137 kfree(smd);
138 hw = ERR_PTR(ret);
139 }
140
141 return hw;
142}
143

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