From f087515c658a68454d43909d482ea4b59e7d6d5c Mon Sep 17 00:00:00 2001
From: Jordan Crouse <jordan.crouse@amd.com>
Date: Sat, 9 Feb 2008 23:24:08 +0100
Subject: x86: GEODE: MFGPT: Use "just-in-time" detection for the MFGPT timers
There isn't much value to always detecting the MFGPT timers on
Geode platforms; detection is only needed when something wants
to use the timers. Move the detection code so that it gets
called the first time a timer is allocated.
Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: Andres Salomon <dilinger@debian.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/kernel/geode_32.c | 5 +----
arch/x86/kernel/mfgpt_32.c | 39 +++++++++++++++++++++++++++------------
2 files changed, 28 insertions(+), 16 deletions(-)
(limited to 'arch')
diff --git a/arch/x86/kernel/geode_32.c b/arch/x86/kernel/geode_32.c
index 9c7f7d395968..9dad6ca6cd70 100644
--- a/arch/x86/kernel/geode_32.c
+++ b/arch/x86/kernel/geode_32.c
@@ -163,14 +163,11 @@ EXPORT_SYMBOL_GPL(geode_gpio_setup_event);
static int __init geode_southbridge_init(void)
{
- int timers;
-
if (!is_geode())
return -ENODEV;
init_lbars();
- timers = geode_mfgpt_detect();
- printk(KERN_INFO "geode: %d MFGPT timers available.\n", timers);
+ (void) mfgpt_timer_setup();
return 0;
}
diff --git a/arch/x86/kernel/mfgpt_32.c b/arch/x86/kernel/mfgpt_32.c
index 5cf3a839530c..abdb7c71199a 100644
--- a/arch/x86/kernel/mfgpt_32.c
+++ b/arch/x86/kernel/mfgpt_32.c
@@ -74,28 +74,37 @@ __setup("mfgptfix", mfgpt_fix);
* In other cases (such as with VSAless OpenFirmware), the system firmware
* leaves timers available for us to use.
*/
-int __init geode_mfgpt_detect(void)
+
+
+static int timers = -1;
+
+static void geode_mfgpt_detect(void)
{
- int count = 0, i;
+ int i;
u16 val;
+ timers = 0;
+
if (disable) {
- printk(KERN_INFO "geode-mfgpt: Skipping MFGPT setup\n");
- return 0;
+ printk(KERN_INFO "geode-mfgpt: MFGPT support is disabled\n");
+ goto done;
+ }
+
+ if (!geode_get_dev_base(GEODE_DEV_MFGPT)) {
+ printk(KERN_INFO "geode-mfgpt: MFGPT LBAR is not set up\n");
+ goto done;
}
for (i = 0; i < MFGPT_MAX_TIMERS; i++) {
val = geode_mfgpt_read(i, MFGPT_REG_SETUP);
if (!(val & MFGPT_SETUP_SETUP)) {
mfgpt_timers[i].avail = 1;
- count++;
+ timers++;
}
}
- /* set up clock event device, if desired */
- i = mfgpt_timer_setup();
-
- return count;
+done:
+ printk(KERN_INFO "geode-mfgpt: %d MFGPT timers available.\n", timers);
}
int geode_mfgpt_toggle_event(int timer, int cmp, int event, int enable)
@@ -183,10 +192,16 @@ int geode_mfgpt_alloc_timer(int timer, int domain)
{
int i;
- if (!geode_get_dev_base(GEODE_DEV_MFGPT))
- return -ENODEV;
+ if (timers == -1) {
+ /* timers haven't been detected yet */
+ geode_mfgpt_detect();
+ }
+
+ if (!timers)
+ return -1;
+
if (timer >= MFGPT_MAX_TIMERS)
- return -EIO;
+ return -1;
if (timer < 0) {
/* Try to find an available timer */
--
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