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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
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@ -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
*/