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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/arm/common/clkdev.c
2 * arch/arm/common/clkdev.c
4 * Copyright (C) 2008 Russell King.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * Helper for the clk API to assist looking up a struct clk.
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/device.h>
15 #include <linux/list.h>
16 #include <linux/errno.h>
17 #include <linux/err.h>
18 #include <linux/string.h>
19 #include <linux/mutex.h>
21 #include <asm/clkdev.h>
22 #include <mach/clkdev.h>
24 static LIST_HEAD(clocks
);
25 static DEFINE_MUTEX(clocks_mutex
);
27 static struct clk
*clk_find(const char *dev_id
, const char *con_id
)
30 struct clk
*clk
= NULL
;
33 list_for_each_entry(p
, &clocks
, node
) {
34 if ((p
->dev_id
&& !dev_id
) || (p
->con_id
&& !con_id
))
38 match
+= 2 * (strcmp(p
->dev_id
, dev_id
) == 0);
40 match
+= 1 * (strcmp(p
->con_id
, con_id
) == 0);
52 struct clk
*clk_get(struct device
*dev
, const char *con_id
)
54 const char *dev_id
= dev
? dev_name(dev
) : NULL
;
57 mutex_lock(&clocks_mutex
);
58 clk
= clk_find(dev_id
, con_id
);
59 if (clk
&& !__clk_get(clk
))
61 mutex_unlock(&clocks_mutex
);
63 return clk
? clk
: ERR_PTR(-ENOENT
);
65 EXPORT_SYMBOL(clk_get
);
67 void clk_put(struct clk
*clk
)
71 EXPORT_SYMBOL(clk_put
);
73 void clkdev_add(struct clk_lookup
*cl
)
75 mutex_lock(&clocks_mutex
);
76 list_add_tail(&cl
->node
, &clocks
);
77 mutex_unlock(&clocks_mutex
);
79 EXPORT_SYMBOL(clkdev_add
);
84 struct clk_lookup_alloc
{
86 char dev_id
[MAX_DEV_ID
];
87 char con_id
[MAX_CON_ID
];
90 struct clk_lookup
*clkdev_alloc(struct clk
*clk
, const char *con_id
,
91 const char *dev_fmt
, ...)
93 struct clk_lookup_alloc
*cla
;
95 cla
= kzalloc(sizeof(*cla
), GFP_KERNEL
);
101 strlcpy(cla
->con_id
, con_id
, sizeof(cla
->con_id
));
102 cla
->cl
.con_id
= cla
->con_id
;
108 va_start(ap
, dev_fmt
);
109 vscnprintf(cla
->dev_id
, sizeof(cla
->dev_id
), dev_fmt
, ap
);
110 cla
->cl
.dev_id
= cla
->dev_id
;
116 EXPORT_SYMBOL(clkdev_alloc
);
119 * clkdev_drop - remove a clock dynamically allocated
121 void clkdev_drop(struct clk_lookup
*cl
)
123 mutex_lock(&clocks_mutex
);
125 mutex_unlock(&clocks_mutex
);
128 EXPORT_SYMBOL(clkdev_drop
);