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3b01f87b UH |
1 | /* |
2 | * PRCC clock implementation for ux500 platform. | |
3 | * | |
4 | * Copyright (C) 2012 ST-Ericsson SA | |
5 | * Author: Ulf Hansson <ulf.hansson@linaro.org> | |
6 | * | |
7 | * License terms: GNU General Public License (GPL) version 2 | |
8 | */ | |
9 | ||
10 | #include <linux/clk-provider.h> | |
3b01f87b UH |
11 | #include <linux/slab.h> |
12 | #include <linux/io.h> | |
13 | #include <linux/err.h> | |
14 | #include <linux/types.h> | |
3b01f87b UH |
15 | |
16 | #include "clk.h" | |
17 | ||
18 | #define PRCC_PCKEN 0x000 | |
19 | #define PRCC_PCKDIS 0x004 | |
20 | #define PRCC_KCKEN 0x008 | |
21 | #define PRCC_KCKDIS 0x00C | |
22 | #define PRCC_PCKSR 0x010 | |
23 | #define PRCC_KCKSR 0x014 | |
24 | ||
25 | #define to_clk_prcc(_hw) container_of(_hw, struct clk_prcc, hw) | |
26 | ||
27 | struct clk_prcc { | |
28 | struct clk_hw hw; | |
29 | void __iomem *base; | |
30 | u32 cg_sel; | |
31 | int is_enabled; | |
32 | }; | |
33 | ||
34 | /* PRCC clock operations. */ | |
35 | ||
36 | static int clk_prcc_pclk_enable(struct clk_hw *hw) | |
37 | { | |
38 | struct clk_prcc *clk = to_clk_prcc(hw); | |
39 | ||
40 | writel(clk->cg_sel, (clk->base + PRCC_PCKEN)); | |
41 | while (!(readl(clk->base + PRCC_PCKSR) & clk->cg_sel)) | |
42 | cpu_relax(); | |
43 | ||
44 | clk->is_enabled = 1; | |
45 | return 0; | |
46 | } | |
47 | ||
48 | static void clk_prcc_pclk_disable(struct clk_hw *hw) | |
49 | { | |
50 | struct clk_prcc *clk = to_clk_prcc(hw); | |
51 | ||
52 | writel(clk->cg_sel, (clk->base + PRCC_PCKDIS)); | |
53 | clk->is_enabled = 0; | |
54 | } | |
55 | ||
56 | static int clk_prcc_kclk_enable(struct clk_hw *hw) | |
57 | { | |
58 | struct clk_prcc *clk = to_clk_prcc(hw); | |
59 | ||
60 | writel(clk->cg_sel, (clk->base + PRCC_KCKEN)); | |
61 | while (!(readl(clk->base + PRCC_KCKSR) & clk->cg_sel)) | |
62 | cpu_relax(); | |
63 | ||
64 | clk->is_enabled = 1; | |
65 | return 0; | |
66 | } | |
67 | ||
68 | static void clk_prcc_kclk_disable(struct clk_hw *hw) | |
69 | { | |
70 | struct clk_prcc *clk = to_clk_prcc(hw); | |
71 | ||
72 | writel(clk->cg_sel, (clk->base + PRCC_KCKDIS)); | |
73 | clk->is_enabled = 0; | |
74 | } | |
75 | ||
76 | static int clk_prcc_is_enabled(struct clk_hw *hw) | |
77 | { | |
78 | struct clk_prcc *clk = to_clk_prcc(hw); | |
79 | return clk->is_enabled; | |
80 | } | |
81 | ||
56d87776 | 82 | static const struct clk_ops clk_prcc_pclk_ops = { |
3b01f87b UH |
83 | .enable = clk_prcc_pclk_enable, |
84 | .disable = clk_prcc_pclk_disable, | |
85 | .is_enabled = clk_prcc_is_enabled, | |
86 | }; | |
87 | ||
56d87776 | 88 | static const struct clk_ops clk_prcc_kclk_ops = { |
3b01f87b UH |
89 | .enable = clk_prcc_kclk_enable, |
90 | .disable = clk_prcc_kclk_disable, | |
91 | .is_enabled = clk_prcc_is_enabled, | |
92 | }; | |
93 | ||
94 | static struct clk *clk_reg_prcc(const char *name, | |
95 | const char *parent_name, | |
96 | resource_size_t phy_base, | |
97 | u32 cg_sel, | |
98 | unsigned long flags, | |
56d87776 | 99 | const struct clk_ops *clk_prcc_ops) |
3b01f87b UH |
100 | { |
101 | struct clk_prcc *clk; | |
102 | struct clk_init_data clk_prcc_init; | |
103 | struct clk *clk_reg; | |
104 | ||
105 | if (!name) { | |
106 | pr_err("clk_prcc: %s invalid arguments passed\n", __func__); | |
107 | return ERR_PTR(-EINVAL); | |
108 | } | |
109 | ||
0b10adba | 110 | clk = kzalloc(sizeof(*clk), GFP_KERNEL); |
7a294dc6 | 111 | if (!clk) |
3b01f87b | 112 | return ERR_PTR(-ENOMEM); |
3b01f87b UH |
113 | |
114 | clk->base = ioremap(phy_base, SZ_4K); | |
115 | if (!clk->base) | |
116 | goto free_clk; | |
117 | ||
118 | clk->cg_sel = cg_sel; | |
119 | clk->is_enabled = 1; | |
120 | ||
121 | clk_prcc_init.name = name; | |
122 | clk_prcc_init.ops = clk_prcc_ops; | |
123 | clk_prcc_init.flags = flags; | |
124 | clk_prcc_init.parent_names = (parent_name ? &parent_name : NULL); | |
125 | clk_prcc_init.num_parents = (parent_name ? 1 : 0); | |
126 | clk->hw.init = &clk_prcc_init; | |
127 | ||
128 | clk_reg = clk_register(NULL, &clk->hw); | |
129 | if (IS_ERR_OR_NULL(clk_reg)) | |
130 | goto unmap_clk; | |
131 | ||
132 | return clk_reg; | |
133 | ||
134 | unmap_clk: | |
135 | iounmap(clk->base); | |
136 | free_clk: | |
137 | kfree(clk); | |
138 | pr_err("clk_prcc: %s failed to register clk\n", __func__); | |
139 | return ERR_PTR(-ENOMEM); | |
140 | } | |
141 | ||
142 | struct clk *clk_reg_prcc_pclk(const char *name, | |
143 | const char *parent_name, | |
144 | resource_size_t phy_base, | |
145 | u32 cg_sel, | |
146 | unsigned long flags) | |
147 | { | |
148 | return clk_reg_prcc(name, parent_name, phy_base, cg_sel, flags, | |
149 | &clk_prcc_pclk_ops); | |
150 | } | |
151 | ||
152 | struct clk *clk_reg_prcc_kclk(const char *name, | |
153 | const char *parent_name, | |
154 | resource_size_t phy_base, | |
155 | u32 cg_sel, | |
156 | unsigned long flags) | |
157 | { | |
158 | return clk_reg_prcc(name, parent_name, phy_base, cg_sel, flags, | |
159 | &clk_prcc_kclk_ops); | |
160 | } |