Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

[linux-2.6] / arch / x86 / kernel / hpet.c

diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index 0ea6a19bfdfead682bbee695f165b05e9e4b9070..59fd3b6b13036e1e279e54d0e1e3d3f5ebb55166 100644 (file)
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -359,6 +359,7 @@ static int hpet_clocksource_register(void)
 int __init hpet_enable(void)
 {
        unsigned long id;
+       int i;
 
        if (!is_hpet_capable())
                return 0;
@@ -369,6 +370,29 @@ int __init hpet_enable(void)
         * Read the period and check for a sane value:
         */
        hpet_period = hpet_readl(HPET_PERIOD);
+
+       /*
+        * AMD SB700 based systems with spread spectrum enabled use a
+        * SMM based HPET emulation to provide proper frequency
+        * setting. The SMM code is initialized with the first HPET
+        * register access and takes some time to complete. During
+        * this time the config register reads 0xffffffff. We check
+        * for max. 1000 loops whether the config register reads a non
+        * 0xffffffff value to make sure that HPET is up and running
+        * before we go further. A counting loop is safe, as the HPET
+        * access takes thousands of CPU cycles. On non SB700 based
+        * machines this check is only done once and has no side
+        * effects.
+        */
+       for (i = 0; hpet_readl(HPET_CFG) == 0xFFFFFFFF; i++) {
+               if (i == 1000) {
+                       printk(KERN_WARNING
+                              "HPET config register value = 0xFFFFFFFF. "
+                              "Disabling HPET\n");
+                       goto out_nohpet;
+               }
+       }
+
        if (hpet_period < HPET_MIN_PERIOD || hpet_period > HPET_MAX_PERIOD)
                goto out_nohpet;
 
@@ -468,7 +492,7 @@ void hpet_disable(void)
 #define RTC_NUM_INTS           1
 
 static unsigned long hpet_rtc_flags;
-static unsigned long hpet_prev_update_sec;
+static int hpet_prev_update_sec;
 static struct rtc_time hpet_alarm_time;
 static unsigned long hpet_pie_count;
 static unsigned long hpet_t1_cmp;
@@ -575,6 +599,9 @@ int hpet_set_rtc_irq_bit(unsigned long bit_mask)
 
        hpet_rtc_flags |= bit_mask;
 
+       if ((bit_mask & RTC_UIE) && !(oldbits & RTC_UIE))
+               hpet_prev_update_sec = -1;
+
        if (!oldbits)
                hpet_rtc_timer_init();
 
@@ -652,7 +679,7 @@ static void hpet_rtc_timer_reinit(void)
                if (hpet_rtc_flags & RTC_PIE)
                        hpet_pie_count += lost_ints;
                if (printk_ratelimit())
-                       printk(KERN_WARNING "rtc: lost %d interrupts\n",
+                       printk(KERN_WARNING "hpet1: lost %d rtc interrupts\n",
                                lost_ints);
        }
 }
@@ -670,7 +697,8 @@ irqreturn_t hpet_rtc_interrupt(int irq, void *dev_id)
 
        if (hpet_rtc_flags & RTC_UIE &&
            curr_time.tm_sec != hpet_prev_update_sec) {
-               rtc_int_flag = RTC_UF;
+               if (hpet_prev_update_sec >= 0)
+                       rtc_int_flag = RTC_UF;
                hpet_prev_update_sec = curr_time.tm_sec;
        }