linux-kernel - [RFC PATCH 6/7] x86/apic: Early setup IOAPIC for APB timer

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Date:	Fri, 28 Aug 2009 14:53:10 -0700
From:	"Pan, Jacob jun" <jacob.jun.pan@...el.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	LKML <linux-kernel@...r.kernel.org>, x86 team <x86@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arjan van de Veen <arjan@...radead.org>,
	Avi Kivity <avi@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Alok N Kataria <akataria@...are.com>
Subject: [RFC PATCH 6/7] x86/apic: Early setup IOAPIC for APB timer

>From 9438ac713c0175e975ef3d0013e6bf2b46883dd0 Mon Sep 17 00:00:00 2001
From: Jacob Pan <jacob.jun.pan@...el.com>
Date: Wed, 15 Jul 2009 11:30:40 -0700
Subject: [PATCH] x86/apic: Early setup IOAPIC for APB timer

Intel Moorestown platform uses APB system timers which rely
on IOAPIC to deliver its interrupts. Early setup the APIC
system is necessary to allow timer interrupts.

Signed-off-by: Jacob Pan <jacob.jun.pan@...el.com>
---
 arch/x86/include/asm/apic.h    |    1 +
 arch/x86/kernel/apic/io_apic.c |   17 +++++++++++++++++
 2 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 8b542f4..4f2d26d 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -84,6 +84,7 @@ extern void xapic_wait_icr_idle(void);
 extern u32 safe_xapic_wait_icr_idle(void);
 extern void xapic_icr_write(u32, u32);
 extern int setup_profiling_timer(unsigned int);
+extern void pre_init_apic_IRQ(void);
 
 static inline void native_apic_mem_write(u32 reg, u32 v)
 {
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index ccc746f..25a5b72 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -36,6 +36,7 @@
 #include <linux/freezer.h>
 #include <linux/kthread.h>
 #include <linux/jiffies.h>	/* time_after() */
+#include <linux/sfi.h>
 #ifdef CONFIG_ACPI
 #include <acpi/acpi_bus.h>
 #endif
@@ -63,6 +64,7 @@
 #include <asm/uv/uv_hub.h>
 #include <asm/uv/uv_irq.h>
 #include <asm/platform_feature.h>
+#include <asm/apb_timer.h>
 #include <asm/apic.h>
 
 #define __apicdebuginit(type) static type __init
@@ -4211,3 +4213,18 @@ void __init ioapic_insert_resources(void)
 		r++;
 	}
 }
+
+/* Enable IOAPIC early just for system timer */
+void __init pre_init_apic_IRQ(void)
+{
+	struct irq_cfg *cfg;
+
+	printk(KERN_INFO "Early APIC setup for system timer\n");
+#ifndef CONFIG_SMP
+	phys_cpu_present_map = physid_mask_of_physid(boot_cpu_physical_apicid);
+#endif
+	setup_local_APIC();
+	cfg = irq_cfg(0);
+	add_pin_to_irq_node(cfg, 0, 0, 0);
+	setup_timer_IRQ0_pin(0, 0, cfg->vector);
+}
-- 
1.5.6.5

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