arch/alpha/kernel/irq_alpha.c

   1 /*
   2  * Alpha specific irq code.
   3  */
   4
   5 #include <linux/config.h>
   6 #include <linux/init.h>
   7 #include <linux/sched.h>
   8 #include <linux/irq.h>
   9 #include <linux/kernel_stat.h>
  10
  11 #include <asm/machvec.h>
  12 #include <asm/dma.h>
  13
  14 #include "proto.h"
  15 #include "irq_impl.h"
  16
  17 /* Hack minimum IPL during interrupt processing for broken hardware.  */
  18 #ifdef CONFIG_ALPHA_BROKEN_IRQ_MASK
  19 int __min_ipl;
  20 #endif
  21
  22 /*
  23  * Performance counter hook.  A module can override this to
  24  * do something useful.
  25  */
  26 static void
  27 dummy_perf(unsigned long vector, struct pt_regs *regs)
  28 {
  29         irq_err_count++;
  30         printk(KERN_CRIT "Performance counter interrupt!\n");
  31 }
  32
  33 void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf;
  34
  35 /*
  36  * The main interrupt entry point.
  37  */
  38
  39 asmlinkage void
  40 do_entInt(unsigned long type, unsigned long vector,
  41           unsigned long la_ptr, struct pt_regs *regs)
  42 {
  43         switch (type) {
  44         case 0:
  45 #ifdef CONFIG_SMP
  46                 handle_ipi(regs);
  47                 return;
  48 #else
  49                 irq_err_count++;
  50                 printk(KERN_CRIT "Interprocessor interrupt? "
  51                        "You must be kidding!\n");
  52 #endif
  53                 break;
  54         case 1:
  55 #ifdef CONFIG_SMP
  56           {
  57                 long cpu;
  58
  59                 local_irq_disable();
  60                 smp_percpu_timer_interrupt(regs);
  61                 cpu = smp_processor_id();
  62                 if (cpu != boot_cpuid) {
  63                         kstat_cpu(cpu).irqs[RTC_IRQ]++;
  64                 } else {
  65                         handle_irq(RTC_IRQ, regs);
  66                 }
  67           }
  68 #else
  69                 handle_irq(RTC_IRQ, regs);
  70 #endif
  71                 return;
  72         case 2:
  73                 alpha_mv.machine_check(vector, la_ptr, regs);
  74                 return;
  75         case 3:
  76                 alpha_mv.device_interrupt(vector, regs);
  77                 return;
  78         case 4:
  79                 perf_irq(la_ptr, regs);
  80                 return;
  81         default:
  82                 printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n",
  83                        type, vector);
  84         }
  85         printk(KERN_CRIT "PC = %016lx PS=%04lx\n", regs->pc, regs->ps);
  86 }
  87
  88 void __init
  89 common_init_isa_dma(void)
  90 {
  91         outb(0, DMA1_RESET_REG);
  92         outb(0, DMA2_RESET_REG);
  93         outb(0, DMA1_CLR_MASK_REG);
  94         outb(0, DMA2_CLR_MASK_REG);
  95 }
  96
  97 void __init
  98 init_IRQ(void)
  99 {
 100         /* Just in case the platform init_irq() causes interrupts/mchecks
 101            (as is the case with RAWHIDE, at least).  */
 102         wrent(entInt, 0);
 103
 104         alpha_mv.init_irq();
 105 }
 106
 107 /*
 108  * machine error checks
 109  */
 110 #define MCHK_K_TPERR           0x0080
 111 #define MCHK_K_TCPERR          0x0082
 112 #define MCHK_K_HERR            0x0084
 113 #define MCHK_K_ECC_C           0x0086
 114 #define MCHK_K_ECC_NC          0x0088
 115 #define MCHK_K_OS_BUGCHECK     0x008A
 116 #define MCHK_K_PAL_BUGCHECK    0x0090
 117
 118 #ifndef CONFIG_SMP
 119 struct mcheck_info __mcheck_info;
 120 #endif
 121
 122 void
 123 process_mcheck_info(unsigned long vector, unsigned long la_ptr,
 124                     struct pt_regs *regs, const char *machine,
 125                     int expected)
 126 {
 127         struct el_common *mchk_header;
 128         const char *reason;
 129
 130         /*
 131          * See if the machine check is due to a badaddr() and if so,
 132          * ignore it.
 133          */
 134
 135 #ifdef CONFIG_VERBOSE_MCHECK
 136         if (alpha_verbose_mcheck > 1) {
 137                 printk(KERN_CRIT "%s machine check %s\n", machine,
 138                        expected ? "expected." : "NOT expected!!!");
 139         }
 140 #endif
 141
 142         if (expected) {
 143                 int cpu = smp_processor_id();
 144                 mcheck_expected(cpu) = 0;
 145                 mcheck_taken(cpu) = 1;
 146                 return;
 147         }
 148
 149         mchk_header = (struct el_common *)la_ptr;
 150
 151         printk(KERN_CRIT "%s machine check: vector=0x%lx pc=0x%lx code=0x%x\n",
 152                machine, vector, regs->pc, mchk_header->code);
 153
 154         switch (mchk_header->code) {
 155         /* Machine check reasons.  Defined according to PALcode sources.  */
 156         case 0x80: reason = "tag parity error"; break;
 157         case 0x82: reason = "tag control parity error"; break;
 158         case 0x84: reason = "generic hard error"; break;
 159         case 0x86: reason = "correctable ECC error"; break;
 160         case 0x88: reason = "uncorrectable ECC error"; break;
 161         case 0x8A: reason = "OS-specific PAL bugcheck"; break;
 162         case 0x90: reason = "callsys in kernel mode"; break;
 163         case 0x96: reason = "i-cache read retryable error"; break;
 164         case 0x98: reason = "processor detected hard error"; break;
 165
 166         /* System specific (these are for Alcor, at least): */
 167         case 0x202: reason = "system detected hard error"; break;
 168         case 0x203: reason = "system detected uncorrectable ECC error"; break;
 169         case 0x204: reason = "SIO SERR occurred on PCI bus"; break;
 170         case 0x205: reason = "parity error detected by core logic"; break;
 171         case 0x206: reason = "SIO IOCHK occurred on ISA bus"; break;
 172         case 0x207: reason = "non-existent memory error"; break;
 173         case 0x208: reason = "MCHK_K_DCSR"; break;
 174         case 0x209: reason = "PCI SERR detected"; break;
 175         case 0x20b: reason = "PCI data parity error detected"; break;
 176         case 0x20d: reason = "PCI address parity error detected"; break;
 177         case 0x20f: reason = "PCI master abort error"; break;
 178         case 0x211: reason = "PCI target abort error"; break;
 179         case 0x213: reason = "scatter/gather PTE invalid error"; break;
 180         case 0x215: reason = "flash ROM write error"; break;
 181         case 0x217: reason = "IOA timeout detected"; break;
 182         case 0x219: reason = "IOCHK#, EISA add-in board parity or other catastrophic error"; break;
 183         case 0x21b: reason = "EISA fail-safe timer timeout"; break;
 184         case 0x21d: reason = "EISA bus time-out"; break;
 185         case 0x21f: reason = "EISA software generated NMI"; break;
 186         case 0x221: reason = "unexpected ev5 IRQ[3] interrupt"; break;
 187         default: reason = "unknown"; break;
 188         }
 189
 190         printk(KERN_CRIT "machine check type: %s%s\n",
 191                reason, mchk_header->retry ? " (retryable)" : "");
 192
 193         dik_show_regs(regs, NULL);
 194
 195 #ifdef CONFIG_VERBOSE_MCHECK
 196         if (alpha_verbose_mcheck > 1) {
 197                 /* Dump the logout area to give all info.  */
 198                 unsigned long *ptr = (unsigned long *)la_ptr;
 199                 long i;
 200                 for (i = 0; i < mchk_header->size / sizeof(long); i += 2) {
 201                         printk(KERN_CRIT "   +%8lx %016lx %016lx\n",
 202                                i*sizeof(long), ptr[i], ptr[i+1]);
 203                 }
 204         }
 205 #endif /* CONFIG_VERBOSE_MCHECK */
 206 }
 207
 208 /*
 209  * The special RTC interrupt type.  The interrupt itself was
 210  * processed by PALcode, and comes in via entInt vector 1.
 211  */
 212
 213 static void rtc_enable_disable(unsigned int irq) { }
 214 static unsigned int rtc_startup(unsigned int irq) { return 0; }
 215
 216 struct irqaction timer_irqaction = {
 217         .handler        = timer_interrupt,
 218         .flags          = SA_INTERRUPT,
 219         .name           = "timer",
 220 };
 221
 222 static struct hw_interrupt_type rtc_irq_type = {
 223         .typename       = "RTC",
 224         .startup        = rtc_startup,
 225         .shutdown       = rtc_enable_disable,
 226         .enable         = rtc_enable_disable,
 227         .disable        = rtc_enable_disable,
 228         .ack            = rtc_enable_disable,
 229         .end            = rtc_enable_disable,
 230 };
 231
 232 void __init
 233 init_rtc_irq(void)
 234 {
 235         irq_desc[RTC_IRQ].status = IRQ_DISABLED;
 236         irq_desc[RTC_IRQ].handler = &rtc_irq_type;
 237         setup_irq(RTC_IRQ, &timer_irqaction);
 238 }
 239
 240 /* Dummy irqactions.  */
 241 struct irqaction isa_cascade_irqaction = {
 242         .handler        = no_action,
 243         .name           = "isa-cascade"
 244 };
 245
 246 struct irqaction timer_cascade_irqaction = {
 247         .handler        = no_action,
 248         .name           = "timer-cascade"
 249 };
 250
 251 struct irqaction halt_switch_irqaction = {
 252         .handler        = no_action,
 253         .name           = "halt-switch"
 254 };