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sh: clkfwk: Wire up clk_get_sys() support.

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This stubs in clk_get_sys() from the ARM clkdev implementation.
Tentatively conver the clk_get() lookup code to use this, and once the
rest of the in-tree users are happy with this, it can replace the
fallback lookups.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2009-05-12 06:18:09 +09:00
parent 007e8363b6
commit 0dae89572c
2 changed files with 66 additions and 0 deletions
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7
arch/sh/include/asm/clock.h
View File

@ -37,6 +37,13 @@ struct clk {
unsigned long arch_flags;
};
struct clk_lookup {
struct list_head node;
const char *dev_id;
const char *con_id;
struct clk *clk;
};
#define CLK_ENABLE_ON_INIT (1 << 0)
/* Should be defined by processor-specific code */

59
arch/sh/kernel/cpu/clock.c
View File

@ -10,6 +10,10 @@
*
* Modified for omap shared clock framework by Tony Lindgren <tony@atomide.com>
*
* With clkdev bits:
*
* Copyright (C) 2008 Russell King.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
@ -334,15 +338,70 @@ long clk_round_rate(struct clk *clk, unsigned long rate)
}
EXPORT_SYMBOL_GPL(clk_round_rate);
/*
* Find the correct struct clk for the device and connection ID.
* We do slightly fuzzy matching here:
* An entry with a NULL ID is assumed to be a wildcard.
* If an entry has a device ID, it must match
* If an entry has a connection ID, it must match
* Then we take the most specific entry - with the following
* order of precidence: dev+con > dev only > con only.
*/
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;
list_for_each_entry(p, &clock_list, node) {
match = 0;
if (p->dev_id) {
if (!dev_id || strcmp(p->dev_id, dev_id))
continue;
match += 2;
}
if (p->con_id) {
if (!con_id || strcmp(p->con_id, con_id))
continue;
match += 1;
}
if (match == 0)
continue;
if (match > best) {
clk = p->clk;
best = match;
}
}
return clk;
}
struct clk *clk_get_sys(const char *dev_id, const char *con_id)
{
struct clk *clk;
mutex_lock(&clock_list_sem);
clk = clk_find(dev_id, con_id);
mutex_unlock(&clock_list_sem);
return clk ? clk : ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL_GPL(clk_get_sys);
/*
* Returns a clock. Note that we first try to use device id on the bus
* and clock name. If this fails, we try to use clock name only.
*/
struct clk *clk_get(struct device *dev, const char *id)
{
const char *dev_id = dev ? dev_name(dev) : NULL;
struct clk *p, *clk = ERR_PTR(-ENOENT);
int idno;
clk = clk_get_sys(dev_id, id);
if (clk)
return clk;
if (dev == NULL || dev->bus != &platform_bus_type)
idno = -1;
else