Merge tag 'fixes-nc-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[~shefty/rdma-dev.git] / arch / arm / mach-imx / clk-busy.c
1 /*
2  * Copyright 2012 Freescale Semiconductor, Inc.
3  * Copyright 2012 Linaro Ltd.
4  *
5  * The code contained herein is licensed under the GNU General Public
6  * License. You may obtain a copy of the GNU General Public License
7  * Version 2 or later at the following locations:
8  *
9  * http://www.opensource.org/licenses/gpl-license.html
10  * http://www.gnu.org/copyleft/gpl.html
11  */
12
13 #include <linux/clk.h>
14 #include <linux/clk-provider.h>
15 #include <linux/io.h>
16 #include <linux/slab.h>
17 #include <linux/jiffies.h>
18 #include <linux/err.h>
19 #include "clk.h"
20
21 static int clk_busy_wait(void __iomem *reg, u8 shift)
22 {
23         unsigned long timeout = jiffies + msecs_to_jiffies(10);
24
25         while (readl_relaxed(reg) & (1 << shift))
26                 if (time_after(jiffies, timeout))
27                         return -ETIMEDOUT;
28
29         return 0;
30 }
31
32 struct clk_busy_divider {
33         struct clk_divider div;
34         const struct clk_ops *div_ops;
35         void __iomem *reg;
36         u8 shift;
37 };
38
39 static inline struct clk_busy_divider *to_clk_busy_divider(struct clk_hw *hw)
40 {
41         struct clk_divider *div = container_of(hw, struct clk_divider, hw);
42
43         return container_of(div, struct clk_busy_divider, div);
44 }
45
46 static unsigned long clk_busy_divider_recalc_rate(struct clk_hw *hw,
47                                                   unsigned long parent_rate)
48 {
49         struct clk_busy_divider *busy = to_clk_busy_divider(hw);
50
51         return busy->div_ops->recalc_rate(&busy->div.hw, parent_rate);
52 }
53
54 static long clk_busy_divider_round_rate(struct clk_hw *hw, unsigned long rate,
55                                         unsigned long *prate)
56 {
57         struct clk_busy_divider *busy = to_clk_busy_divider(hw);
58
59         return busy->div_ops->round_rate(&busy->div.hw, rate, prate);
60 }
61
62 static int clk_busy_divider_set_rate(struct clk_hw *hw, unsigned long rate,
63                 unsigned long parent_rate)
64 {
65         struct clk_busy_divider *busy = to_clk_busy_divider(hw);
66         int ret;
67
68         ret = busy->div_ops->set_rate(&busy->div.hw, rate, parent_rate);
69         if (!ret)
70                 ret = clk_busy_wait(busy->reg, busy->shift);
71
72         return ret;
73 }
74
75 static struct clk_ops clk_busy_divider_ops = {
76         .recalc_rate = clk_busy_divider_recalc_rate,
77         .round_rate = clk_busy_divider_round_rate,
78         .set_rate = clk_busy_divider_set_rate,
79 };
80
81 struct clk *imx_clk_busy_divider(const char *name, const char *parent_name,
82                                  void __iomem *reg, u8 shift, u8 width,
83                                  void __iomem *busy_reg, u8 busy_shift)
84 {
85         struct clk_busy_divider *busy;
86         struct clk *clk;
87         struct clk_init_data init;
88
89         busy = kzalloc(sizeof(*busy), GFP_KERNEL);
90         if (!busy)
91                 return ERR_PTR(-ENOMEM);
92
93         busy->reg = busy_reg;
94         busy->shift = busy_shift;
95
96         busy->div.reg = reg;
97         busy->div.shift = shift;
98         busy->div.width = width;
99         busy->div.lock = &imx_ccm_lock;
100         busy->div_ops = &clk_divider_ops;
101
102         init.name = name;
103         init.ops = &clk_busy_divider_ops;
104         init.flags = CLK_SET_RATE_PARENT;
105         init.parent_names = &parent_name;
106         init.num_parents = 1;
107
108         busy->div.hw.init = &init;
109
110         clk = clk_register(NULL, &busy->div.hw);
111         if (IS_ERR(clk))
112                 kfree(busy);
113
114         return clk;
115 }
116
117 struct clk_busy_mux {
118         struct clk_mux mux;
119         const struct clk_ops *mux_ops;
120         void __iomem *reg;
121         u8 shift;
122 };
123
124 static inline struct clk_busy_mux *to_clk_busy_mux(struct clk_hw *hw)
125 {
126         struct clk_mux *mux = container_of(hw, struct clk_mux, hw);
127
128         return container_of(mux, struct clk_busy_mux, mux);
129 }
130
131 static u8 clk_busy_mux_get_parent(struct clk_hw *hw)
132 {
133         struct clk_busy_mux *busy = to_clk_busy_mux(hw);
134
135         return busy->mux_ops->get_parent(&busy->mux.hw);
136 }
137
138 static int clk_busy_mux_set_parent(struct clk_hw *hw, u8 index)
139 {
140         struct clk_busy_mux *busy = to_clk_busy_mux(hw);
141         int ret;
142
143         ret = busy->mux_ops->set_parent(&busy->mux.hw, index);
144         if (!ret)
145                 ret = clk_busy_wait(busy->reg, busy->shift);
146
147         return ret;
148 }
149
150 static struct clk_ops clk_busy_mux_ops = {
151         .get_parent = clk_busy_mux_get_parent,
152         .set_parent = clk_busy_mux_set_parent,
153 };
154
155 struct clk *imx_clk_busy_mux(const char *name, void __iomem *reg, u8 shift,
156                              u8 width, void __iomem *busy_reg, u8 busy_shift,
157                              const char **parent_names, int num_parents)
158 {
159         struct clk_busy_mux *busy;
160         struct clk *clk;
161         struct clk_init_data init;
162
163         busy = kzalloc(sizeof(*busy), GFP_KERNEL);
164         if (!busy)
165                 return ERR_PTR(-ENOMEM);
166
167         busy->reg = busy_reg;
168         busy->shift = busy_shift;
169
170         busy->mux.reg = reg;
171         busy->mux.shift = shift;
172         busy->mux.mask = BIT(width) - 1;
173         busy->mux.lock = &imx_ccm_lock;
174         busy->mux_ops = &clk_mux_ops;
175
176         init.name = name;
177         init.ops = &clk_busy_mux_ops;
178         init.flags = 0;
179         init.parent_names = parent_names;
180         init.num_parents = num_parents;
181
182         busy->mux.hw.init = &init;
183
184         clk = clk_register(NULL, &busy->mux.hw);
185         if (IS_ERR(clk))
186                 kfree(busy);
187
188         return clk;
189 }