aboutsummaryrefslogtreecommitdiff
path: root/arch
diff options
context:
space:
mode:
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/hpet.c54
-rw-r--r--arch/x86/kernel/io_apic.c64
2 files changed, 118 insertions, 0 deletions
diff --git a/arch/x86/kernel/hpet.c b/arch/x86/kernel/hpet.c
index f7cb5e9e261..3f10d16a834 100644
--- a/arch/x86/kernel/hpet.c
+++ b/arch/x86/kernel/hpet.c
@@ -6,6 +6,8 @@
#include <linux/init.h>
#include <linux/sysdev.h>
#include <linux/pm.h>
+#include <linux/interrupt.h>
+#include <linux/cpu.h>
#include <asm/fixmap.h>
#include <asm/hpet.h>
@@ -25,6 +27,15 @@
unsigned long hpet_address;
static void __iomem *hpet_virt_address;
+struct hpet_dev {
+ struct clock_event_device evt;
+ unsigned int num;
+ int cpu;
+ unsigned int irq;
+ unsigned int flags;
+ char name[10];
+};
+
unsigned long hpet_readl(unsigned long a)
{
return readl(hpet_virt_address + a);
@@ -305,6 +316,49 @@ static int hpet_legacy_next_event(unsigned long delta,
}
/*
+ * HPET MSI Support
+ */
+
+void hpet_msi_unmask(unsigned int irq)
+{
+ struct hpet_dev *hdev = get_irq_data(irq);
+ unsigned long cfg;
+
+ /* unmask it */
+ cfg = hpet_readl(HPET_Tn_CFG(hdev->num));
+ cfg |= HPET_TN_FSB;
+ hpet_writel(cfg, HPET_Tn_CFG(hdev->num));
+}
+
+void hpet_msi_mask(unsigned int irq)
+{
+ unsigned long cfg;
+ struct hpet_dev *hdev = get_irq_data(irq);
+
+ /* mask it */
+ cfg = hpet_readl(HPET_Tn_CFG(hdev->num));
+ cfg &= ~HPET_TN_FSB;
+ hpet_writel(cfg, HPET_Tn_CFG(hdev->num));
+}
+
+void hpet_msi_write(unsigned int irq, struct msi_msg *msg)
+{
+ struct hpet_dev *hdev = get_irq_data(irq);
+
+ hpet_writel(msg->data, HPET_Tn_ROUTE(hdev->num));
+ hpet_writel(msg->address_lo, HPET_Tn_ROUTE(hdev->num) + 4);
+}
+
+void hpet_msi_read(unsigned int irq, struct msi_msg *msg)
+{
+ struct hpet_dev *hdev = get_irq_data(irq);
+
+ msg->data = hpet_readl(HPET_Tn_ROUTE(hdev->num));
+ msg->address_lo = hpet_readl(HPET_Tn_ROUTE(hdev->num) + 4);
+ msg->address_hi = 0;
+}
+
+/*
* Clock source related code
*/
static cycle_t read_hpet(void)
diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c
index d22fecf828b..77fa155becf 100644
--- a/arch/x86/kernel/io_apic.c
+++ b/arch/x86/kernel/io_apic.c
@@ -41,6 +41,7 @@
#endif
#include <linux/bootmem.h>
#include <linux/dmar.h>
+#include <linux/hpet.h>
#include <asm/idle.h>
#include <asm/io.h>
@@ -56,6 +57,7 @@
#include <asm/hypertransport.h>
#include <asm/setup.h>
#include <asm/irq_remapping.h>
+#include <asm/hpet.h>
#include <mach_ipi.h>
#include <mach_apic.h>
@@ -3522,6 +3524,68 @@ int arch_setup_dmar_msi(unsigned int irq)
}
#endif
+#ifdef CONFIG_HPET_TIMER
+
+#ifdef CONFIG_SMP
+static void hpet_msi_set_affinity(unsigned int irq, cpumask_t mask)
+{
+ struct irq_cfg *cfg;
+ struct irq_desc *desc;
+ struct msi_msg msg;
+ unsigned int dest;
+ cpumask_t tmp;
+
+ cpus_and(tmp, mask, cpu_online_map);
+ if (cpus_empty(tmp))
+ return;
+
+ if (assign_irq_vector(irq, mask))
+ return;
+
+ cfg = irq_cfg(irq);
+ cpus_and(tmp, cfg->domain, mask);
+ dest = cpu_mask_to_apicid(tmp);
+
+ hpet_msi_read(irq, &msg);
+
+ msg.data &= ~MSI_DATA_VECTOR_MASK;
+ msg.data |= MSI_DATA_VECTOR(cfg->vector);
+ msg.address_lo &= ~MSI_ADDR_DEST_ID_MASK;
+ msg.address_lo |= MSI_ADDR_DEST_ID(dest);
+
+ hpet_msi_write(irq, &msg);
+ desc = irq_to_desc(irq);
+ desc->affinity = mask;
+}
+#endif /* CONFIG_SMP */
+
+struct irq_chip hpet_msi_type = {
+ .name = "HPET_MSI",
+ .unmask = hpet_msi_unmask,
+ .mask = hpet_msi_mask,
+ .ack = ack_apic_edge,
+#ifdef CONFIG_SMP
+ .set_affinity = hpet_msi_set_affinity,
+#endif
+ .retrigger = ioapic_retrigger_irq,
+};
+
+int arch_setup_hpet_msi(unsigned int irq)
+{
+ int ret;
+ struct msi_msg msg;
+
+ ret = msi_compose_msg(NULL, irq, &msg);
+ if (ret < 0)
+ return ret;
+
+ hpet_msi_write(irq, &msg);
+ set_irq_chip_and_handler_name(irq, &hpet_msi_type, handle_edge_irq,
+ "edge");
+ return 0;
+}
+#endif
+
#endif /* CONFIG_PCI_MSI */
/*
* Hypertransport interrupt support