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gerrit-public.fairphone.software / kernel / msm-4.9 / ce0694841ea61607afcbdb5a67bb0b00328357ef / . / drivers / clk / samsung / clk-exynos-clkout.c
blob: 3a7cb2506731c0ab04e4f3901e789588be8211af [file] [log] [blame]
Tomasz Figa1e832e52014-06-24 18:08:26 +0200[diff] [blame]1/*
2 * Copyright (c) 2014 Samsung Electronics Co., Ltd.
3 * Author: Tomasz Figa <t.figa@samsung.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Clock driver for Exynos clock output
10 */
11
12#include <linux/clk.h>
13#include <linux/clkdev.h>
14#include <linux/clk-provider.h>
15#include <linux/of.h>
16#include <linux/of_address.h>
17#include <linux/syscore_ops.h>
18
19#define EXYNOS_CLKOUT_NR_CLKS 1
20#define EXYNOS_CLKOUT_PARENTS 32
21
22#define EXYNOS_PMU_DEBUG_REG 0xa00
23#define EXYNOS_CLKOUT_DISABLE_SHIFT 0
24#define EXYNOS_CLKOUT_MUX_SHIFT 8
25#define EXYNOS4_CLKOUT_MUX_MASK 0xf
26#define EXYNOS5_CLKOUT_MUX_MASK 0x1f
27
28struct exynos_clkout {
29 struct clk_gate gate;
30 struct clk_mux mux;
31 spinlock_t slock;
32 struct clk_onecell_data data;
33 struct clk *clk_table[EXYNOS_CLKOUT_NR_CLKS];
34 void __iomem *reg;
35 u32 pmu_debug_save;
36};
37
38static struct exynos_clkout *clkout;
39
40static int exynos_clkout_suspend(void)
41{
42 clkout->pmu_debug_save = readl(clkout->reg + EXYNOS_PMU_DEBUG_REG);
43
44 return 0;
45}
46
47static void exynos_clkout_resume(void)
48{
49 writel(clkout->pmu_debug_save, clkout->reg + EXYNOS_PMU_DEBUG_REG);
50}
51
52static struct syscore_ops exynos_clkout_syscore_ops = {
53 .suspend = exynos_clkout_suspend,
54 .resume = exynos_clkout_resume,
55};
56
57static void __init exynos_clkout_init(struct device_node *node, u32 mux_mask)
58{
59 const char *parent_names[EXYNOS_CLKOUT_PARENTS];
60 struct clk *parents[EXYNOS_CLKOUT_PARENTS];
61 int parent_count;
62 int ret;
63 int i;
64
65 clkout = kzalloc(sizeof(*clkout), GFP_KERNEL);
66 if (!clkout)
67 return;
68
69 spin_lock_init(&clkout->slock);
70
71 parent_count = 0;
72 for (i = 0; i < EXYNOS_CLKOUT_PARENTS; ++i) {
73 char name[] = "clkoutXX";
74
75 snprintf(name, sizeof(name), "clkout%d", i);
76 parents[i] = of_clk_get_by_name(node, name);
77 if (IS_ERR(parents[i])) {
78 parent_names[i] = "none";
79 continue;
80 }
81
82 parent_names[i] = __clk_get_name(parents[i]);
83 parent_count = i + 1;
84 }
85
86 if (!parent_count)
87 goto free_clkout;
88
89 clkout->reg = of_iomap(node, 0);
90 if (!clkout->reg)
91 goto clks_put;
92
93 clkout->gate.reg = clkout->reg + EXYNOS_PMU_DEBUG_REG;
94 clkout->gate.bit_idx = EXYNOS_CLKOUT_DISABLE_SHIFT;
95 clkout->gate.flags = CLK_GATE_SET_TO_DISABLE;
96 clkout->gate.lock = &clkout->slock;
97
98 clkout->mux.reg = clkout->reg + EXYNOS_PMU_DEBUG_REG;
99 clkout->mux.mask = mux_mask;
100 clkout->mux.shift = EXYNOS_CLKOUT_MUX_SHIFT;
101 clkout->mux.lock = &clkout->slock;
102
103 clkout->clk_table[0] = clk_register_composite(NULL, "clkout",
104 parent_names, parent_count, &clkout->mux.hw,
105 &clk_mux_ops, NULL, NULL, &clkout->gate.hw,
106 &clk_gate_ops, CLK_SET_RATE_PARENT
107 | CLK_SET_RATE_NO_REPARENT);
108 if (IS_ERR(clkout->clk_table[0]))
109 goto err_unmap;
110
111 clkout->data.clks = clkout->clk_table;
112 clkout->data.clk_num = EXYNOS_CLKOUT_NR_CLKS;
113 ret = of_clk_add_provider(node, of_clk_src_onecell_get, &clkout->data);
114 if (ret)
115 goto err_clk_unreg;
116
117 register_syscore_ops(&exynos_clkout_syscore_ops);
118
119 return;
120
121err_clk_unreg:
122 clk_unregister(clkout->clk_table[0]);
123err_unmap:
124 iounmap(clkout->reg);
125clks_put:
126 for (i = 0; i < EXYNOS_CLKOUT_PARENTS; ++i)
127 if (!IS_ERR(parents[i]))
128 clk_put(parents[i]);
129free_clkout:
130 kfree(clkout);
131
132 pr_err("%s: failed to register clkout clock\n", __func__);
133}
134
135static void __init exynos4_clkout_init(struct device_node *node)
136{
137 exynos_clkout_init(node, EXYNOS4_CLKOUT_MUX_MASK);
138}
139CLK_OF_DECLARE(exynos4210_clkout, "samsung,exynos4210-pmu",
140 exynos4_clkout_init);
141CLK_OF_DECLARE(exynos4212_clkout, "samsung,exynos4212-pmu",
142 exynos4_clkout_init);
143CLK_OF_DECLARE(exynos4412_clkout, "samsung,exynos4412-pmu",
144 exynos4_clkout_init);
145
146static void __init exynos5_clkout_init(struct device_node *node)
147{
148 exynos_clkout_init(node, EXYNOS5_CLKOUT_MUX_MASK);
149}
150CLK_OF_DECLARE(exynos5250_clkout, "samsung,exynos5250-pmu",
151 exynos5_clkout_init);
152CLK_OF_DECLARE(exynos5420_clkout, "samsung,exynos5420-pmu",
153 exynos5_clkout_init);