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         struct pt_regs *old_regs;
  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                 old_regs = set_irq_regs(regs);
  56 #ifdef CONFIG_SMP
  57           {
  58                 long cpu;
  59
  60                 local_irq_disable();
  61                 smp_percpu_timer_interrupt(regs);
  62                 cpu = smp_processor_id();
  63                 if (cpu != boot_cpuid) {
  64                         kstat_cpu(cpu).irqs[RTC_IRQ]++;
  65                 } else {
  66                         handle_irq(RTC_IRQ);
  67                 }
  68           }
  69 #else
  70                 handle_irq(RTC_IRQ);
  71 #endif
  72                 set_irq_regs(old_regs);
  73                 return;
  74         case 2:
  75                 alpha_mv.machine_check(vector, la_ptr, regs);
  76                 return;
  77         case 3:
  78                 old_regs = set_irq_regs(regs);
  79                 alpha_mv.device_interrupt(vector);
  80                 set_irq_regs(old_regs);
  81                 return;
  82         case 4:
  83                 perf_irq(la_ptr, regs);
  84                 return;
  85         default:
  86                 printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n",
  87                        type, vector);
  88         }
  89         printk(KERN_CRIT "PC = %016lx PS=%04lx\n", regs->pc, regs->ps);
  90 }
  91
  92 void __init
  93 common_init_isa_dma(void)
  94 {
  95         outb(0, DMA1_RESET_REG);
  96         outb(0, DMA2_RESET_REG);
  97         outb(0, DMA1_CLR_MASK_REG);
  98         outb(0, DMA2_CLR_MASK_REG);
  99 }
 100
 101 void __init
 102 init_IRQ(void)
 103 {
 104         /* Just in case the platform init_irq() causes interrupts/mchecks
 105            (as is the case with RAWHIDE, at least).  */
 106         wrent(entInt, 0);
 107
 108         alpha_mv.init_irq();
 109 }
 110
 111 /*
 112  * machine error checks
 113  */
 114 #define MCHK_K_TPERR           0x0080
 115 #define MCHK_K_TCPERR          0x0082
 116 #define MCHK_K_HERR            0x0084
 117 #define MCHK_K_ECC_C           0x0086
 118 #define MCHK_K_ECC_NC          0x0088
 119 #define MCHK_K_OS_BUGCHECK     0x008A
 120 #define MCHK_K_PAL_BUGCHECK    0x0090
 121
 122 #ifndef CONFIG_SMP
 123 struct mcheck_info __mcheck_info;
 124 #endif
 125
 126 void
 127 process_mcheck_info(unsigned long vector, unsigned long la_ptr,
 128                     struct pt_regs *regs, const char *machine,
 129                     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, 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(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  */
 216
 217 static void rtc_enable_disable(unsigned int irq) { }
 218 static unsigned int rtc_startup(unsigned int irq) { return 0; }
 219
 220 struct irqaction timer_irqaction = {
 221         .handler        = timer_interrupt,
 222         .flags          = IRQF_DISABLED,
 223         .name           = "timer",
 224 };
 225
 226 static struct hw_interrupt_type rtc_irq_type = {
 227         .typename       = "RTC",
 228         .startup        = rtc_startup,
 229         .shutdown       = rtc_enable_disable,
 230         .enable         = rtc_enable_disable,
 231         .disable        = rtc_enable_disable,
 232         .ack            = rtc_enable_disable,
 233         .end            = rtc_enable_disable,
 234 };
 235
 236 void __init
 237 init_rtc_irq(void)
 238 {
 239         irq_desc[RTC_IRQ].status = IRQ_DISABLED;
 240         irq_desc[RTC_IRQ].chip = &rtc_irq_type;
 241         setup_irq(RTC_IRQ, &timer_irqaction);
 242 }
 243
 244 /* Dummy irqactions.  */
 245 struct irqaction isa_cascade_irqaction = {
 246         .handler        = no_action,
 247         .name           = "isa-cascade"
 248 };
 249
 250 struct irqaction timer_cascade_irqaction = {
 251         .handler        = no_action,
 252         .name           = "timer-cascade"
 253 };
 254
 255 struct irqaction halt_switch_irqaction = {
 256         .handler        = no_action,
 257         .name           = "halt-switch"
 258 };