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yaml --- r: 123548 b: refs/heads/master c: 31bccbf h: refs/heads/master v: v3
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Russell King
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Russell King
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Nov 27, 2008
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,2 @@ | ||
| --- | ||
| refs/heads/master: 635f0258e5ae526034486b4ae9020e64bfb7d27e | ||
| refs/heads/master: 31bccbf39208133415000520c79ebe7b291786df |
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| Original file line number | Diff line number | Diff line change |
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@@ -33,3 +33,6 @@ config SHARPSL_PM | |
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| config SHARP_SCOOP | ||
| bool | ||
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| config COMMON_CLKDEV | ||
| bool | ||
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,128 @@ | ||
| /* | ||
| * arch/arm/common/clkdev.c | ||
| * | ||
| * Copyright (C) 2008 Russell King. | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License version 2 as | ||
| * published by the Free Software Foundation. | ||
| * | ||
| * Helper for the clk API to assist looking up a struct clk. | ||
| */ | ||
| #include <linux/module.h> | ||
| #include <linux/kernel.h> | ||
| #include <linux/device.h> | ||
| #include <linux/list.h> | ||
| #include <linux/errno.h> | ||
| #include <linux/err.h> | ||
| #include <linux/string.h> | ||
| #include <linux/mutex.h> | ||
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| #include <asm/clkdev.h> | ||
| #include <mach/clkdev.h> | ||
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| static LIST_HEAD(clocks); | ||
| static DEFINE_MUTEX(clocks_mutex); | ||
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| static struct clk *clk_find(const char *dev_id, const char *con_id) | ||
| { | ||
| struct clk_lookup *p; | ||
| struct clk *clk = NULL; | ||
| int match, best = 0; | ||
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| list_for_each_entry(p, &clocks, node) { | ||
| if ((p->dev_id && !dev_id) || (p->con_id && !con_id)) | ||
| continue; | ||
| match = 0; | ||
| if (p->dev_id) | ||
| match += 2 * (strcmp(p->dev_id, dev_id) == 0); | ||
| if (p->con_id) | ||
| match += 1 * (strcmp(p->con_id, con_id) == 0); | ||
| if (match == 0) | ||
| continue; | ||
|
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| if (match > best) { | ||
| clk = p->clk; | ||
| best = match; | ||
| } | ||
| } | ||
| return clk; | ||
| } | ||
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| struct clk *clk_get(struct device *dev, const char *con_id) | ||
| { | ||
| const char *dev_id = dev ? dev_name(dev) : NULL; | ||
| struct clk *clk; | ||
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| mutex_lock(&clocks_mutex); | ||
| clk = clk_find(dev_id, con_id); | ||
| if (clk && !__clk_get(clk)) | ||
| clk = NULL; | ||
| mutex_unlock(&clocks_mutex); | ||
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| return clk ? clk : ERR_PTR(-ENOENT); | ||
| } | ||
| EXPORT_SYMBOL(clk_get); | ||
|
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| void clk_put(struct clk *clk) | ||
| { | ||
| __clk_put(clk); | ||
| } | ||
| EXPORT_SYMBOL(clk_put); | ||
|
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| void clkdev_add(struct clk_lookup *cl) | ||
| { | ||
| mutex_lock(&clocks_mutex); | ||
| list_add_tail(&cl->node, &clocks); | ||
| mutex_unlock(&clocks_mutex); | ||
| } | ||
| EXPORT_SYMBOL(clkdev_add); | ||
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| #define MAX_DEV_ID 20 | ||
| #define MAX_CON_ID 16 | ||
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| struct clk_lookup_alloc { | ||
| struct clk_lookup cl; | ||
| char dev_id[MAX_DEV_ID]; | ||
| char con_id[MAX_CON_ID]; | ||
| }; | ||
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| struct clk_lookup *clkdev_alloc(struct clk *clk, const char *con_id, | ||
| const char *dev_fmt, ...) | ||
| { | ||
| struct clk_lookup_alloc *cla; | ||
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| cla = kzalloc(sizeof(*cla), GFP_KERNEL); | ||
| if (!cla) | ||
| return NULL; | ||
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| cla->cl.clk = clk; | ||
| if (con_id) { | ||
| strlcpy(cla->con_id, con_id, sizeof(cla->con_id)); | ||
| cla->cl.con_id = cla->con_id; | ||
| } | ||
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| if (dev_fmt) { | ||
| va_list ap; | ||
|
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| va_start(ap, dev_fmt); | ||
| vscnprintf(cla->dev_id, sizeof(cla->dev_id), dev_fmt, ap); | ||
| cla->cl.dev_id = cla->dev_id; | ||
| va_end(ap); | ||
| } | ||
|
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| return &cla->cl; | ||
| } | ||
| EXPORT_SYMBOL(clkdev_alloc); | ||
|
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| /* | ||
| * clkdev_drop - remove a clock dynamically allocated | ||
| */ | ||
| void clkdev_drop(struct clk_lookup *cl) | ||
| { | ||
| mutex_lock(&clocks_mutex); | ||
| list_del(&cl->node); | ||
| mutex_unlock(&clocks_mutex); | ||
| kfree(cl); | ||
| } | ||
| EXPORT_SYMBOL(clkdev_drop); |
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