forked from luck/tmp_suning_uos_patched
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>
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@ -163,14 +163,11 @@ EXPORT_SYMBOL_GPL(geode_gpio_setup_event);
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static int __init geode_southbridge_init(void)
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{
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int timers;
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if (!is_geode())
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return -ENODEV;
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init_lbars();
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timers = geode_mfgpt_detect();
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printk(KERN_INFO "geode: %d MFGPT timers available.\n", timers);
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(void) mfgpt_timer_setup();
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return 0;
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}
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@ -74,28 +74,37 @@ __setup("mfgptfix", mfgpt_fix);
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* In other cases (such as with VSAless OpenFirmware), the system firmware
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* leaves timers available for us to use.
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*/
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int __init geode_mfgpt_detect(void)
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static int timers = -1;
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static void geode_mfgpt_detect(void)
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{
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int count = 0, i;
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int i;
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u16 val;
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timers = 0;
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if (disable) {
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printk(KERN_INFO "geode-mfgpt: Skipping MFGPT setup\n");
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return 0;
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printk(KERN_INFO "geode-mfgpt: MFGPT support is disabled\n");
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goto done;
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}
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if (!geode_get_dev_base(GEODE_DEV_MFGPT)) {
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printk(KERN_INFO "geode-mfgpt: MFGPT LBAR is not set up\n");
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goto done;
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}
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for (i = 0; i < MFGPT_MAX_TIMERS; i++) {
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val = geode_mfgpt_read(i, MFGPT_REG_SETUP);
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if (!(val & MFGPT_SETUP_SETUP)) {
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mfgpt_timers[i].avail = 1;
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count++;
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timers++;
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}
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}
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/* set up clock event device, if desired */
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i = mfgpt_timer_setup();
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return count;
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done:
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printk(KERN_INFO "geode-mfgpt: %d MFGPT timers available.\n", timers);
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}
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int geode_mfgpt_toggle_event(int timer, int cmp, int event, int enable)
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@ -183,10 +192,16 @@ int geode_mfgpt_alloc_timer(int timer, int domain)
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{
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int i;
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if (!geode_get_dev_base(GEODE_DEV_MFGPT))
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return -ENODEV;
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if (timers == -1) {
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/* timers haven't been detected yet */
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geode_mfgpt_detect();
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}
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if (!timers)
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return -1;
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if (timer >= MFGPT_MAX_TIMERS)
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return -EIO;
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return -1;
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if (timer < 0) {
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/* Try to find an available timer */
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@ -206,7 +206,6 @@ static inline u16 geode_mfgpt_read(int timer, u16 reg)
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return inw(base + reg + (timer * 8));
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}
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extern int __init geode_mfgpt_detect(void);
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extern int geode_mfgpt_toggle_event(int timer, int cmp, int event, int enable);
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extern int geode_mfgpt_set_irq(int timer, int cmp, int irq, int enable);
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extern int geode_mfgpt_alloc_timer(int timer, int domain);
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