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[AVR32] NMI debugging

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Change the NMI handler to use the die notifier chain to signal anyone
who cares. Add a simple "nmi debugger" which hooks into this chain and
that may dump registers, task state, etc. when it happens.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
This commit is contained in:
Haavard Skinnemoen
2007-10-10 14:58:29 +02:00
parent f6135d12db
commit e7ba176b47
10 changed files with 166 additions and 10 deletions
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39
arch/avr32/mach-at32ap/extint.c
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@@ -26,16 +26,10 @@
#define EIC_MODE 0x0014
#define EIC_EDGE 0x0018
#define EIC_LEVEL 0x001c
#define EIC_TEST 0x0020
#define EIC_NMIC 0x0024
/* Bitfields in TEST */
#define EIC_TESTEN_OFFSET 31
#define EIC_TESTEN_SIZE 1
/* Bitfields in NMIC */
#define EIC_EN_OFFSET 0
#define EIC_EN_SIZE 1
#define EIC_NMIC_ENABLE (1 << 0)
/* Bit manipulation macros */
#define EIC_BIT(name) \
@@ -63,6 +57,9 @@ struct eic {
unsigned int first_irq;
};
static struct eic *nmi_eic;
static bool nmi_enabled;
static void eic_ack_irq(unsigned int irq)
{
struct eic *eic = get_irq_chip_data(irq);
@@ -174,6 +171,24 @@ static void demux_eic_irq(unsigned int irq, struct irq_desc *desc)
}
}
int nmi_enable(void)
{
nmi_enabled = true;
if (nmi_eic)
eic_writel(nmi_eic, NMIC, EIC_NMIC_ENABLE);
return 0;
}
void nmi_disable(void)
{
if (nmi_eic)
eic_writel(nmi_eic, NMIC, 0);
nmi_enabled = false;
}
static int __init eic_probe(struct platform_device *pdev)
{
struct eic *eic;
@@ -230,6 +245,16 @@ static int __init eic_probe(struct platform_device *pdev)
set_irq_chained_handler(int_irq, demux_eic_irq);
set_irq_data(int_irq, eic);
if (pdev->id == 0) {
nmi_eic = eic;
if (nmi_enabled)
/*
* Someone tried to enable NMI before we were
* ready. Do it now.
*/
nmi_enable();
}
dev_info(&pdev->dev,
"External Interrupt Controller at 0x%p, IRQ %u\n",
eic->regs, int_irq);