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authorThomas Gleixner <tglx@linutronix.de>2008-04-04 10:26:10 -0400
committerIngo Molnar <mingo@elte.hu>2008-04-04 12:36:49 -0400
commit5761d64b277c287a7520b868c32d656ef03374b4 (patch)
tree9fb217efd1a50ed4d5fbf5c313cae586604d6f2f /drivers
parent47001d603375f857a7fab0e9c095d964a1ea0039 (diff)
x86: revert assign IRQs to hpet timer
The commits: commit 37a47db8d7f0f38dac5acf5a13abbc8f401707fa Author: Balaji Rao <balajirrao@gmail.com> Date: Wed Jan 30 13:30:03 2008 +0100 x86: assign IRQs to HPET timers, fix and commit e3f37a54f690d3e64995ea7ecea08c5ab3070faf Author: Balaji Rao <balajirrao@gmail.com> Date: Wed Jan 30 13:30:03 2008 +0100 x86: assign IRQs to HPET timers have been identified to cause a regression on some platforms due to the assignement of legacy IRQs which makes the legacy devices connected to those IRQs disfunctional. Revert them. This fixes http://bugzilla.kernel.org/show_bug.cgi?id=10382 Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/char/hpet.c51
1 files changed, 7 insertions, 44 deletions
diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c
index 465ad35ed38f..1399971be689 100644
--- a/drivers/char/hpet.c
+++ b/drivers/char/hpet.c
@@ -731,14 +731,14 @@ static unsigned long hpet_calibrate(struct hpets *hpetp)
731 731
732int hpet_alloc(struct hpet_data *hdp) 732int hpet_alloc(struct hpet_data *hdp)
733{ 733{
734 u64 cap, mcfg, hpet_config; 734 u64 cap, mcfg;
735 struct hpet_dev *devp; 735 struct hpet_dev *devp;
736 u32 i, ntimer, irq; 736 u32 i, ntimer;
737 struct hpets *hpetp; 737 struct hpets *hpetp;
738 size_t siz; 738 size_t siz;
739 struct hpet __iomem *hpet; 739 struct hpet __iomem *hpet;
740 static struct hpets *last = NULL; 740 static struct hpets *last = NULL;
741 unsigned long period, irq_bitmap; 741 unsigned long period;
742 unsigned long long temp; 742 unsigned long long temp;
743 743
744 /* 744 /*
@@ -765,47 +765,11 @@ int hpet_alloc(struct hpet_data *hdp)
765 hpetp->hp_hpet_phys = hdp->hd_phys_address; 765 hpetp->hp_hpet_phys = hdp->hd_phys_address;
766 766
767 hpetp->hp_ntimer = hdp->hd_nirqs; 767 hpetp->hp_ntimer = hdp->hd_nirqs;
768 hpet = hpetp->hp_hpet;
769
770 /* Assign IRQs statically for legacy devices */
771 hpetp->hp_dev[0].hd_hdwirq = hdp->hd_irq[0];
772 hpetp->hp_dev[1].hd_hdwirq = hdp->hd_irq[1];
773
774 /* Assign IRQs dynamically for the others */
775 for (i = 2, devp = &hpetp->hp_dev[2]; i < hdp->hd_nirqs; i++, devp++) {
776 struct hpet_timer __iomem *timer;
777 768
778 timer = &hpet->hpet_timers[devp - hpetp->hp_dev]; 769 for (i = 0; i < hdp->hd_nirqs; i++)
770 hpetp->hp_dev[i].hd_hdwirq = hdp->hd_irq[i];
779 771
780 /* Check if there's already an IRQ assigned to the timer */ 772 hpet = hpetp->hp_hpet;
781 if (hdp->hd_irq[i]) {
782 hpetp->hp_dev[i].hd_hdwirq = hdp->hd_irq[i];
783 continue;
784 }
785
786 hpet_config = readq(&timer->hpet_config);
787 irq_bitmap = (hpet_config & Tn_INT_ROUTE_CAP_MASK)
788 >> Tn_INT_ROUTE_CAP_SHIFT;
789 if (!irq_bitmap)
790 irq = 0; /* No valid IRQ Assignable */
791 else {
792 irq = find_first_bit(&irq_bitmap, 32);
793 do {
794 hpet_config |= irq << Tn_INT_ROUTE_CNF_SHIFT;
795 writeq(hpet_config, &timer->hpet_config);
796
797 /*
798 * Verify whether we have written a valid
799 * IRQ number by reading it back again
800 */
801 hpet_config = readq(&timer->hpet_config);
802 if (irq == (hpet_config & Tn_INT_ROUTE_CNF_MASK)
803 >> Tn_INT_ROUTE_CNF_SHIFT)
804 break; /* Success */
805 } while ((irq = (find_next_bit(&irq_bitmap, 32, irq))));
806 }
807 hpetp->hp_dev[i].hd_hdwirq = irq;
808 }
809 773
810 cap = readq(&hpet->hpet_cap); 774 cap = readq(&hpet->hpet_cap);
811 775
@@ -836,8 +800,7 @@ int hpet_alloc(struct hpet_data *hdp)
836 hpetp->hp_which, hdp->hd_phys_address, 800 hpetp->hp_which, hdp->hd_phys_address,
837 hpetp->hp_ntimer > 1 ? "s" : ""); 801 hpetp->hp_ntimer > 1 ? "s" : "");
838 for (i = 0; i < hpetp->hp_ntimer; i++) 802 for (i = 0; i < hpetp->hp_ntimer; i++)
839 printk("%s %d", i > 0 ? "," : "", 803 printk("%s %d", i > 0 ? "," : "", hdp->hd_irq[i]);
840 hpetp->hp_dev[i].hd_hdwirq);
841 printk("\n"); 804 printk("\n");
842 805
843 printk(KERN_INFO "hpet%u: %u %d-bit timers, %Lu Hz\n", 806 printk(KERN_INFO "hpet%u: %u %d-bit timers, %Lu Hz\n",