arch/alpha/kernel/irq_alpha.c

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