Viewing file:  irq_alpha.c (6.51 KB) -rw-r--r--
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/*
* Alpha specific irq code.
*/
#include <linux/config.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/irq.h>
#include <linux/kernel_stat.h>
#include <asm/machvec.h>
#include <asm/dma.h>
#include "proto.h"
#include "irq_impl.h"
#ifndef CONFIG_SMP
unsigned long __irq_attempt[NR_IRQS];
#endif
/* Hack minimum IPL during interrupt processing for broken hardware. */
#ifdef CONFIG_ALPHA_BROKEN_IRQ_MASK
int __min_ipl;
#endif
/*
* Performance counter hook. A module can override this to
* do something useful.
*/
static void
dummy_perf(unsigned long vector, struct pt_regs *regs)
{
irq_err_count++;
printk(KERN_CRIT "Performance counter interrupt!\n");
}
void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf;
/*
* The main interrupt entry point.
*/
asmlinkage void
do_entInt(unsigned long type, unsigned long vector, unsigned long la_ptr,
unsigned long a3, unsigned long a4, unsigned long a5,
struct pt_regs regs)
{
switch (type) {
case 0:
#ifdef CONFIG_SMP
handle_ipi(®s);
return;
#else
irq_err_count++;
printk(KERN_CRIT "Interprocessor interrupt? "
"You must be kidding!\n");
#endif
break;
case 1:
#ifdef CONFIG_SMP
{
long cpu;
smp_percpu_timer_interrupt(®s);
cpu = smp_processor_id();
if (cpu != boot_cpuid) {
irq_attempt(cpu, RTC_IRQ)++;
kstat.irqs[cpu][RTC_IRQ]++;
} else {
handle_irq(RTC_IRQ, ®s);
}
}
#else
handle_irq(RTC_IRQ, ®s);
#endif
return;
case 2:
alpha_mv.machine_check(vector, la_ptr, ®s);
return;
case 3:
alpha_mv.device_interrupt(vector, ®s);
return;
case 4:
perf_irq(vector, ®s);
return;
default:
printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n",
type, vector);
}
printk("PC = %016lx PS=%04lx\n", regs.pc, regs.ps);
}
void __init
common_init_isa_dma(void)
{
outb(0, DMA1_RESET_REG);
outb(0, DMA2_RESET_REG);
outb(0, DMA1_CLR_MASK_REG);
outb(0, DMA2_CLR_MASK_REG);
}
void __init
init_IRQ(void)
{
/* Uh, this really MUST come first, just in case
* the platform init_irq() causes interrupts/mchecks
* (as is the case with RAWHIDE, at least).
*/
wrent(entInt, 0);
alpha_mv.init_irq();
}
/*
* machine error checks
*/
#define MCHK_K_TPERR 0x0080
#define MCHK_K_TCPERR 0x0082
#define MCHK_K_HERR 0x0084
#define MCHK_K_ECC_C 0x0086
#define MCHK_K_ECC_NC 0x0088
#define MCHK_K_OS_BUGCHECK 0x008A
#define MCHK_K_PAL_BUGCHECK 0x0090
#ifndef CONFIG_SMP
struct mcheck_info __mcheck_info;
#endif
void
process_mcheck_info(unsigned long vector, unsigned long la_ptr,
struct pt_regs *regs, const char *machine,
int expected)
{
struct el_common *mchk_header;
const char *reason;
/*
* See if the machine check is due to a badaddr() and if so,
* ignore it.
*/
#if DEBUG_MCHECK > 0
printk(KERN_CRIT "%s machine check %s\n", machine,
expected ? "expected." : "NOT expected!!!");
#endif
if (expected) {
int cpu = smp_processor_id();
mcheck_expected(cpu) = 0;
mcheck_taken(cpu) = 1;
return;
}
mchk_header = (struct el_common *)la_ptr;
printk(KERN_CRIT "%s machine check: vector=0x%lx pc=0x%lx code=0x%lx\n",
machine, vector, regs->pc, mchk_header->code);
switch ((unsigned int) mchk_header->code) {
/* Machine check reasons. Defined according to PALcode sources. */
case 0x80: reason = "tag parity error"; break;
case 0x82: reason = "tag control parity error"; break;
case 0x84: reason = "generic hard error"; break;
case 0x86: reason = "correctable ECC error"; break;
case 0x88: reason = "uncorrectable ECC error"; break;
case 0x8A: reason = "OS-specific PAL bugcheck"; break;
case 0x90: reason = "callsys in kernel mode"; break;
case 0x96: reason = "i-cache read retryable error"; break;
case 0x98: reason = "processor detected hard error"; break;
/* System specific (these are for Alcor, at least): */
case 0x202: reason = "system detected hard error"; break;
case 0x203: reason = "system detected uncorrectable ECC error"; break;
case 0x204: reason = "SIO SERR occurred on PCI bus"; break;
case 0x205: reason = "parity error detected by core logic"; break;
case 0x206: reason = "SIO IOCHK occurred on ISA bus"; break;
case 0x207: reason = "non-existent memory error"; break;
case 0x208: reason = "MCHK_K_DCSR"; break;
case 0x209: reason = "PCI SERR detected"; break;
case 0x20b: reason = "PCI data parity error detected"; break;
case 0x20d: reason = "PCI address parity error detected"; break;
case 0x20f: reason = "PCI master abort error"; break;
case 0x211: reason = "PCI target abort error"; break;
case 0x213: reason = "scatter/gather PTE invalid error"; break;
case 0x215: reason = "flash ROM write error"; break;
case 0x217: reason = "IOA timeout detected"; break;
case 0x219: reason = "IOCHK#, EISA add-in board parity or other catastrophic error"; break;
case 0x21b: reason = "EISA fail-safe timer timeout"; break;
case 0x21d: reason = "EISA bus time-out"; break;
case 0x21f: reason = "EISA software generated NMI"; break;
case 0x221: reason = "unexpected ev5 IRQ[3] interrupt"; break;
default: reason = "unknown"; break;
}
printk(KERN_CRIT "machine check type: %s%s\n",
reason, mchk_header->retry ? " (retryable)" : "");
dik_show_regs(regs, NULL);
#if DEBUG_MCHECK > 1
{
/* Dump the logout area to give all info. */
unsigned long *ptr = (unsigned long *)la_ptr;
long i;
for (i = 0; i < mchk_header->size / sizeof(long); i += 2) {
printk(KERN_CRIT " +%8lx %016lx %016lx\n",
i*sizeof(long), ptr[i], ptr[i+1]);
}
}
#endif
}
/*
* The special RTC interrupt type. The interrupt itself was
* processed by PALcode, and comes in via entInt vector 1.
*/
static void rtc_enable_disable(unsigned int irq) { }
static unsigned int rtc_startup(unsigned int irq) { return 0; }
struct irqaction timer_irqaction = {
handler: timer_interrupt,
flags: SA_INTERRUPT,
name: "timer",
};
static struct hw_interrupt_type rtc_irq_type = {
typename: "RTC",
startup: rtc_startup,
shutdown: rtc_enable_disable,
enable: rtc_enable_disable,
disable: rtc_enable_disable,
ack: rtc_enable_disable,
end: rtc_enable_disable,
};
void __init
init_rtc_irq(void)
{
irq_desc[RTC_IRQ].status = IRQ_DISABLED;
irq_desc[RTC_IRQ].handler = &rtc_irq_type;
setup_irq(RTC_IRQ, &timer_irqaction);
}
/* Dummy irqactions. */
struct irqaction isa_cascade_irqaction = {
handler: no_action,
name: "isa-cascade"
};
struct irqaction timer_cascade_irqaction = {
handler: no_action,
name: "timer-cascade"
};
struct irqaction halt_switch_irqaction = {
handler: no_action,
name: "halt-switch"
};
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