Warning: That file was not part of the compilation database. It may have many parsing errors.
1 | /* |
---|---|
2 | * Hisilicon clock separated gate driver |
3 | * |
4 | * Copyright (c) 2012-2013 Hisilicon Limited. |
5 | * Copyright (c) 2012-2013 Linaro Limited. |
6 | * |
7 | * Author: Haojian Zhuang <haojian.zhuang@linaro.org> |
8 | * Xin Li <li.xin@linaro.org> |
9 | * |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License as published by |
12 | * the Free Software Foundation; either version 2 of the License, or |
13 | * (at your option) any later version. |
14 | * |
15 | * This program is distributed in the hope that it will be useful, |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
18 | * GNU General Public License for more details. |
19 | * |
20 | * You should have received a copy of the GNU General Public License along |
21 | * with this program; if not, write to the Free Software Foundation, Inc., |
22 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
23 | * |
24 | */ |
25 | |
26 | #include <linux/kernel.h> |
27 | #include <linux/clk-provider.h> |
28 | #include <linux/io.h> |
29 | #include <linux/slab.h> |
30 | |
31 | #include "clk.h" |
32 | |
33 | /* clock separated gate register offset */ |
34 | #define CLKGATE_SEPERATED_ENABLE 0x0 |
35 | #define CLKGATE_SEPERATED_DISABLE 0x4 |
36 | #define CLKGATE_SEPERATED_STATUS 0x8 |
37 | |
38 | struct clkgate_separated { |
39 | struct clk_hw hw; |
40 | void __iomem *enable; /* enable register */ |
41 | u8 bit_idx; /* bits in enable/disable register */ |
42 | u8 flags; |
43 | spinlock_t *lock; |
44 | }; |
45 | |
46 | static int clkgate_separated_enable(struct clk_hw *hw) |
47 | { |
48 | struct clkgate_separated *sclk; |
49 | unsigned long flags = 0; |
50 | u32 reg; |
51 | |
52 | sclk = container_of(hw, struct clkgate_separated, hw); |
53 | if (sclk->lock) |
54 | spin_lock_irqsave(sclk->lock, flags); |
55 | reg = BIT(sclk->bit_idx); |
56 | writel_relaxed(reg, sclk->enable); |
57 | readl_relaxed(sclk->enable + CLKGATE_SEPERATED_STATUS); |
58 | if (sclk->lock) |
59 | spin_unlock_irqrestore(sclk->lock, flags); |
60 | return 0; |
61 | } |
62 | |
63 | static void clkgate_separated_disable(struct clk_hw *hw) |
64 | { |
65 | struct clkgate_separated *sclk; |
66 | unsigned long flags = 0; |
67 | u32 reg; |
68 | |
69 | sclk = container_of(hw, struct clkgate_separated, hw); |
70 | if (sclk->lock) |
71 | spin_lock_irqsave(sclk->lock, flags); |
72 | reg = BIT(sclk->bit_idx); |
73 | writel_relaxed(reg, sclk->enable + CLKGATE_SEPERATED_DISABLE); |
74 | readl_relaxed(sclk->enable + CLKGATE_SEPERATED_STATUS); |
75 | if (sclk->lock) |
76 | spin_unlock_irqrestore(sclk->lock, flags); |
77 | } |
78 | |
79 | static int clkgate_separated_is_enabled(struct clk_hw *hw) |
80 | { |
81 | struct clkgate_separated *sclk; |
82 | u32 reg; |
83 | |
84 | sclk = container_of(hw, struct clkgate_separated, hw); |
85 | reg = readl_relaxed(sclk->enable + CLKGATE_SEPERATED_STATUS); |
86 | reg &= BIT(sclk->bit_idx); |
87 | |
88 | return reg ? 1 : 0; |
89 | } |
90 | |
91 | static const struct clk_ops clkgate_separated_ops = { |
92 | .enable = clkgate_separated_enable, |
93 | .disable = clkgate_separated_disable, |
94 | .is_enabled = clkgate_separated_is_enabled, |
95 | }; |
96 | |
97 | struct clk *hisi_register_clkgate_sep(struct device *dev, const char *name, |
98 | const char *parent_name, |
99 | unsigned long flags, |
100 | void __iomem *reg, u8 bit_idx, |
101 | u8 clk_gate_flags, spinlock_t *lock) |
102 | { |
103 | struct clkgate_separated *sclk; |
104 | struct clk *clk; |
105 | struct clk_init_data init; |
106 | |
107 | sclk = kzalloc(sizeof(*sclk), GFP_KERNEL); |
108 | if (!sclk) |
109 | return ERR_PTR(-ENOMEM); |
110 | |
111 | init.name = name; |
112 | init.ops = &clkgate_separated_ops; |
113 | init.flags = flags; |
114 | init.parent_names = (parent_name ? &parent_name : NULL); |
115 | init.num_parents = (parent_name ? 1 : 0); |
116 | |
117 | sclk->enable = reg + CLKGATE_SEPERATED_ENABLE; |
118 | sclk->bit_idx = bit_idx; |
119 | sclk->flags = clk_gate_flags; |
120 | sclk->hw.init = &init; |
121 | sclk->lock = lock; |
122 | |
123 | clk = clk_register(dev, &sclk->hw); |
124 | if (IS_ERR(clk)) |
125 | kfree(sclk); |
126 | return clk; |
127 | } |
128 |
Warning: That file was not part of the compilation database. It may have many parsing errors.