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x86: HPET_MSI Basic HPET_MSI setup code

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Basic HPET MSI setup code. Routines to perform basic MSI read write
in HPET memory map and setting up irq_chip for HPET MSI.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
venkatesh.pallipadi@intel.com 2008-09-05 18:02:17 -07:00 committed by Ingo Molnar
parent b40d575bf0
commit 58ac1e76ce
3 changed files with 139 additions and 0 deletions
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54
arch/x86/kernel/hpet.c
View file

@ -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);
@ -304,6 +315,49 @@ static int hpet_legacy_next_event(unsigned long delta,
return hpet_next_event(delta, evt, 0);
}
/*
* 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
*/

64
arch/x86/kernel/io_apic.c
View file

@ -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

21
include/asm-x86/hpet.h
View file

@ -1,6 +1,8 @@
#ifndef ASM_X86__HPET_H
#define ASM_X86__HPET_H
#include <linux/msi.h>
#ifdef CONFIG_HPET_TIMER
#define HPET_MMAP_SIZE 1024
@ -10,6 +12,11 @@
#define HPET_CFG 0x010
#define HPET_STATUS 0x020
#define HPET_COUNTER 0x0f0
#define HPET_Tn_CFG(n) (0x100 + 0x20 * n)
#define HPET_Tn_CMP(n) (0x108 + 0x20 * n)
#define HPET_Tn_ROUTE(n) (0x110 + 0x20 * n)
#define HPET_T0_CFG 0x100
#define HPET_T0_CMP 0x108
#define HPET_T0_ROUTE 0x110
@ -65,6 +72,20 @@ extern void hpet_disable(void);
extern unsigned long hpet_readl(unsigned long a);
extern void force_hpet_resume(void);
extern void hpet_msi_unmask(unsigned int irq);
extern void hpet_msi_mask(unsigned int irq);
extern void hpet_msi_write(unsigned int irq, struct msi_msg *msg);
extern void hpet_msi_read(unsigned int irq, struct msi_msg *msg);
#ifdef CONFIG_PCI_MSI
extern int arch_setup_hpet_msi(unsigned int irq);
#else
static inline int arch_setup_hpet_msi(unsigned int irq)
{
return -EINVAL;
}
#endif
#ifdef CONFIG_HPET_EMULATE_RTC
#include <linux/interrupt.h>