diff options
Diffstat (limited to 'arch/alpha/kernel/irq_alpha.c')
| -rw-r--r-- | arch/alpha/kernel/irq_alpha.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/arch/alpha/kernel/irq_alpha.c b/arch/alpha/kernel/irq_alpha.c new file mode 100644 index 00000000000..e6ded33c6e2 --- /dev/null +++ b/arch/alpha/kernel/irq_alpha.c @@ -0,0 +1,252 @@ +/* + * 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" + +/* 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, struct pt_regs *regs) +{ + switch (type) { + case 0: +#ifdef CONFIG_SMP + handle_ipi(regs); + 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(regs); + cpu = smp_processor_id(); + if (cpu != boot_cpuid) { + kstat_cpu(cpu).irqs[RTC_IRQ]++; + } else { + handle_irq(RTC_IRQ, regs); + } + } +#else + handle_irq(RTC_IRQ, regs); +#endif + return; + case 2: + alpha_mv.machine_check(vector, la_ptr, regs); + return; + case 3: + alpha_mv.device_interrupt(vector, regs); + return; + case 4: + perf_irq(la_ptr, regs); + return; + default: + printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n", + type, vector); + } + printk(KERN_CRIT "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) +{ + /* 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. + */ + +#ifdef CONFIG_VERBOSE_MCHECK + if (alpha_verbose_mcheck > 1) { + 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%x\n", + machine, vector, regs->pc, mchk_header->code); + + switch (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); + +#ifdef CONFIG_VERBOSE_MCHECK + if (alpha_verbose_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 /* CONFIG_VERBOSE_MCHECK */ +} + +/* + * 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" +}; |