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authorAlex Raimondi <raimondi@miromico.ch>2008-09-22 21:40:55 +0200
committerHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-10-05 19:33:48 +0200
commit300bb762513f12068bf6166e0a1a02a4031a979c (patch)
treebfebd28b2753936a7009cda2559265364f65783c /arch/avr32/mach-at32ap/clock.c
parent787928e7473246991177e8cd7eeaf4cb1b3a8fbc (diff)
avr32: Replace static clock list with dynamic linked list
This replaces the at32_clock_list array with a linked list. Clocks can now be registered (added) to the list. Signed-off-by: Alex Raimondi <raimondi@miromico.ch> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Diffstat (limited to 'arch/avr32/mach-at32ap/clock.c')
-rw-r--r--arch/avr32/mach-at32ap/clock.c52
1 files changed, 40 insertions, 12 deletions
diff --git a/arch/avr32/mach-at32ap/clock.c b/arch/avr32/mach-at32ap/clock.c
index 6c27ddac5ad..138a00a2a2d 100644
--- a/arch/avr32/mach-at32ap/clock.c
+++ b/arch/avr32/mach-at32ap/clock.c
@@ -15,24 +15,40 @@
#include <linux/err.h>
#include <linux/device.h>
#include <linux/string.h>
+#include <linux/list.h>
#include <mach/chip.h>
#include "clock.h"
+/* at32 clock list */
+static LIST_HEAD(at32_clock_list);
+
static DEFINE_SPINLOCK(clk_lock);
+static DEFINE_SPINLOCK(clk_list_lock);
+
+void at32_clk_register(struct clk *clk)
+{
+ spin_lock(&clk_list_lock);
+ /* add the new item to the end of the list */
+ list_add_tail(&clk->list, &at32_clock_list);
+ spin_unlock(&clk_list_lock);
+}
struct clk *clk_get(struct device *dev, const char *id)
{
- int i;
+ struct clk *clk;
- for (i = 0; i < at32_nr_clocks; i++) {
- struct clk *clk = at32_clock_list[i];
+ spin_lock(&clk_list_lock);
- if (clk->dev == dev && strcmp(id, clk->name) == 0)
+ list_for_each_entry(clk, &at32_clock_list, list) {
+ if (clk->dev == dev && strcmp(id, clk->name) == 0) {
+ spin_unlock(&clk_list_lock);
return clk;
+ }
}
+ spin_unlock(&clk_list_lock);
return ERR_PTR(-ENOENT);
}
EXPORT_SYMBOL(clk_get);
@@ -203,8 +219,8 @@ dump_clock(struct clk *parent, struct clkinf *r)
/* cost of this scan is small, but not linear... */
r->nest = nest + NEST_DELTA;
- for (i = 3; i < at32_nr_clocks; i++) {
- clk = at32_clock_list[i];
+
+ list_for_each_entry(clk, &at32_clock_list, list) {
if (clk->parent == parent)
dump_clock(clk, r);
}
@@ -215,6 +231,7 @@ static int clk_show(struct seq_file *s, void *unused)
{
struct clkinf r;
int i;
+ struct clk *clk;
/* show all the power manager registers */
seq_printf(s, "MCCTRL = %8x\n", pm_readl(MCCTRL));
@@ -234,14 +251,25 @@ static int clk_show(struct seq_file *s, void *unused)
seq_printf(s, "\n");
- /* show clock tree as derived from the three oscillators
- * we "know" are at the head of the list
- */
r.s = s;
r.nest = 0;
- dump_clock(at32_clock_list[0], &r);
- dump_clock(at32_clock_list[1], &r);
- dump_clock(at32_clock_list[2], &r);
+ /* protected from changes on the list while dumping */
+ spin_lock(&clk_list_lock);
+
+ /* show clock tree as derived from the three oscillators */
+ clk = clk_get(NULL, "osc32k");
+ dump_clock(clk, &r);
+ clk_put(clk);
+
+ clk = clk_get(NULL, "osc0");
+ dump_clock(clk, &r);
+ clk_put(clk);
+
+ clk = clk_get(NULL, "osc1");
+ dump_clock(clk, &r);
+ clk_put(clk);
+
+ spin_unlock(&clk_list_lock);
return 0;
}