linux/arch/alpha/kernel/irq_alpha.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Alpha specific irq code.
   4 */
   5
   6#include <linux/init.h>
   7#include <linux/sched.h>
   8#include <linux/irq.h>
   9#include <linux/kernel_stat.h>
  10#include <linux/module.h>
  11
  12#include <asm/machvec.h>
  13#include <asm/dma.h>
  14#include <asm/perf_event.h>
  15#include <asm/mce.h>
  16
  17#include "proto.h"
  18#include "irq_impl.h"
  19
  20/* Hack minimum IPL during interrupt processing for broken hardware.  */
  21#ifdef CONFIG_ALPHA_BROKEN_IRQ_MASK
  22int __min_ipl;
  23EXPORT_SYMBOL(__min_ipl);
  24#endif
  25
  26/*
  27 * Performance counter hook.  A module can override this to
  28 * do something useful.
  29 */
  30static void
  31dummy_perf(unsigned long vector, struct pt_regs *regs)
  32{
  33        irq_err_count++;
  34        printk(KERN_CRIT "Performance counter interrupt!\n");
  35}
  36
  37void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf;
  38EXPORT_SYMBOL(perf_irq);
  39
  40/*
  41 * The main interrupt entry point.
  42 */
  43
  44asmlinkage void 
  45do_entInt(unsigned long type, unsigned long vector,
  46          unsigned long la_ptr, struct pt_regs *regs)
  47{
  48        struct pt_regs *old_regs;
  49
  50        /*
  51         * Disable interrupts during IRQ handling.
  52         * Note that there is no matching local_irq_enable() due to
  53         * severe problems with RTI at IPL0 and some MILO PALcode
  54         * (namely LX164).
  55         */
  56        local_irq_disable();
  57        switch (type) {
  58        case 0:
  59#ifdef CONFIG_SMP
  60                handle_ipi(regs);
  61                return;
  62#else
  63                irq_err_count++;
  64                printk(KERN_CRIT "Interprocessor interrupt? "
  65                       "You must be kidding!\n");
  66#endif
  67                break;
  68        case 1:
  69                old_regs = set_irq_regs(regs);
  70                handle_irq(RTC_IRQ);
  71                set_irq_regs(old_regs);
  72                return;
  73        case 2:
  74                old_regs = set_irq_regs(regs);
  75                alpha_mv.machine_check(vector, la_ptr);
  76                set_irq_regs(old_regs);
  77                return;
  78        case 3:
  79                old_regs = set_irq_regs(regs);
  80                alpha_mv.device_interrupt(vector);
  81                set_irq_regs(old_regs);
  82                return;
  83        case 4:
  84                perf_irq(la_ptr, regs);
  85                return;
  86        default:
  87                printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n",
  88                       type, vector);
  89        }
  90        printk(KERN_CRIT "PC = %016lx PS=%04lx\n", regs->pc, regs->ps);
  91}
  92
  93void __init
  94common_init_isa_dma(void)
  95{
  96        outb(0, DMA1_RESET_REG);
  97        outb(0, DMA2_RESET_REG);
  98        outb(0, DMA1_CLR_MASK_REG);
  99        outb(0, DMA2_CLR_MASK_REG);
 100}
 101
 102void __init
 103init_IRQ(void)
 104{
 105        /* Just in case the platform init_irq() causes interrupts/mchecks
 106           (as is the case with RAWHIDE, at least).  */
 107        wrent(entInt, 0);
 108
 109        alpha_mv.init_irq();
 110}
 111
 112/*
 113 * machine error checks
 114 */
 115#define MCHK_K_TPERR           0x0080
 116#define MCHK_K_TCPERR          0x0082
 117#define MCHK_K_HERR            0x0084
 118#define MCHK_K_ECC_C           0x0086
 119#define MCHK_K_ECC_NC          0x0088
 120#define MCHK_K_OS_BUGCHECK     0x008A
 121#define MCHK_K_PAL_BUGCHECK    0x0090
 122
 123#ifndef CONFIG_SMP
 124struct mcheck_info __mcheck_info;
 125#endif
 126
 127void
 128process_mcheck_info(unsigned long vector, unsigned long la_ptr,
 129                    const char *machine, int expected)
 130{
 131        struct el_common *mchk_header;
 132        const char *reason;
 133
 134        /*
 135         * See if the machine check is due to a badaddr() and if so,
 136         * ignore it.
 137         */
 138
 139#ifdef CONFIG_VERBOSE_MCHECK
 140        if (alpha_verbose_mcheck > 1) {
 141                printk(KERN_CRIT "%s machine check %s\n", machine,
 142                       expected ? "expected." : "NOT expected!!!");
 143        }
 144#endif
 145
 146        if (expected) {
 147                int cpu = smp_processor_id();
 148                mcheck_expected(cpu) = 0;
 149                mcheck_taken(cpu) = 1;
 150                return;
 151        }
 152
 153        mchk_header = (struct el_common *)la_ptr;
 154
 155        printk(KERN_CRIT "%s machine check: vector=0x%lx pc=0x%lx code=0x%x\n",
 156               machine, vector, get_irq_regs()->pc, mchk_header->code);
 157
 158        switch (mchk_header->code) {
 159        /* Machine check reasons.  Defined according to PALcode sources.  */
 160        case 0x80: reason = "tag parity error"; break;
 161        case 0x82: reason = "tag control parity error"; break;
 162        case 0x84: reason = "generic hard error"; break;
 163        case 0x86: reason = "correctable ECC error"; break;
 164        case 0x88: reason = "uncorrectable ECC error"; break;
 165        case 0x8A: reason = "OS-specific PAL bugcheck"; break;
 166        case 0x90: reason = "callsys in kernel mode"; break;
 167        case 0x96: reason = "i-cache read retryable error"; break;
 168        case 0x98: reason = "processor detected hard error"; break;
 169        
 170        /* System specific (these are for Alcor, at least): */
 171        case 0x202: reason = "system detected hard error"; break;
 172        case 0x203: reason = "system detected uncorrectable ECC error"; break;
 173        case 0x204: reason = "SIO SERR occurred on PCI bus"; break;
 174        case 0x205: reason = "parity error detected by core logic"; break;
 175        case 0x206: reason = "SIO IOCHK occurred on ISA bus"; break;
 176        case 0x207: reason = "non-existent memory error"; break;
 177        case 0x208: reason = "MCHK_K_DCSR"; break;
 178        case 0x209: reason = "PCI SERR detected"; break;
 179        case 0x20b: reason = "PCI data parity error detected"; break;
 180        case 0x20d: reason = "PCI address parity error detected"; break;
 181        case 0x20f: reason = "PCI master abort error"; break;
 182        case 0x211: reason = "PCI target abort error"; break;
 183        case 0x213: reason = "scatter/gather PTE invalid error"; break;
 184        case 0x215: reason = "flash ROM write error"; break;
 185        case 0x217: reason = "IOA timeout detected"; break;
 186        case 0x219: reason = "IOCHK#, EISA add-in board parity or other catastrophic error"; break;
 187        case 0x21b: reason = "EISA fail-safe timer timeout"; break;
 188        case 0x21d: reason = "EISA bus time-out"; break;
 189        case 0x21f: reason = "EISA software generated NMI"; break;
 190        case 0x221: reason = "unexpected ev5 IRQ[3] interrupt"; break;
 191        default: reason = "unknown"; break;
 192        }
 193
 194        printk(KERN_CRIT "machine check type: %s%s\n",
 195               reason, mchk_header->retry ? " (retryable)" : "");
 196
 197        dik_show_regs(get_irq_regs(), NULL);
 198
 199#ifdef CONFIG_VERBOSE_MCHECK
 200        if (alpha_verbose_mcheck > 1) {
 201                /* Dump the logout area to give all info.  */
 202                unsigned long *ptr = (unsigned long *)la_ptr;
 203                long i;
 204                for (i = 0; i < mchk_header->size / sizeof(long); i += 2) {
 205                        printk(KERN_CRIT "   +%8lx %016lx %016lx\n",
 206                               i*sizeof(long), ptr[i], ptr[i+1]);
 207                }
 208        }
 209#endif /* CONFIG_VERBOSE_MCHECK */
 210}
 211
 212/*
 213 * The special RTC interrupt type.  The interrupt itself was
 214 * processed by PALcode, and comes in via entInt vector 1.
 215 */
 216void __init
 217init_rtc_irq(irq_handler_t handler)
 218{
 219        irq_set_chip_and_handler_name(RTC_IRQ, &dummy_irq_chip,
 220                                      handle_percpu_irq, "RTC");
 221        if (!handler)
 222                handler = rtc_timer_interrupt;
 223        if (request_irq(RTC_IRQ, handler, 0, "timer", NULL))
 224                pr_err("Failed to register timer interrupt\n");
 225}
 226