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x86: GEODE: MFGPT: Use "just-in-time" detection for the MFGPT timers

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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>
This commit is contained in:
Jordan Crouse 2008-02-09 23:24:08 +01:00 committed by Thomas Gleixner
parent b0e6bf2571
commit f087515c65
3 changed files with 28 additions and 17 deletions
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5
arch/x86/kernel/geode_32.c
View file

@ -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;
}

39
arch/x86/kernel/mfgpt_32.c
View file

@ -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 */

1
include/asm-x86/geode.h
View file

@ -206,7 +206,6 @@ static inline u16 geode_mfgpt_read(int timer, u16 reg)
return inw(base + reg + (timer * 8));
}
extern int __init geode_mfgpt_detect(void);
extern int geode_mfgpt_toggle_event(int timer, int cmp, int event, int enable);
extern int geode_mfgpt_set_irq(int timer, int cmp, int irq, int enable);
extern int geode_mfgpt_alloc_timer(int timer, int domain);