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-rw-r--r--arch/alpha/kernel/irq_alpha.c252
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 000000000000..e6ded33c6e22
--- /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"
+};