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 #include <linux/module.h>
  10
  11 #include <asm/machvec.h>
  12 #include <asm/dma.h>
  13 #include <asm/perf_event.h>
  14 #include <asm/mce.h>
  15
  16 #include "proto.h"
  17 #include "irq_impl.h"
  18
  19 /* Hack minimum IPL during interrupt processing for broken hardware.  */
  20 #ifdef CONFIG_ALPHA_BROKEN_IRQ_MASK
  21 int __min_ipl;
  22 EXPORT_SYMBOL(__min_ipl);
  23 #endif
  24
  25 /*
  26  * Performance counter hook.  A module can override this to
  27  * do something useful.
  28  */
  29 static void
  30 dummy_perf(unsigned long vector, struct pt_regs *regs)
  31 {
  32         irq_err_count++;
  33         printk(KERN_CRIT "Performance counter interrupt!\n");
  34 }
  35
  36 void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf;
  37 EXPORT_SYMBOL(perf_irq);
  38
  39 /*
  40  * The main interrupt entry point.
  41  */
  42
  43 asmlinkage void
  44 do_entInt(unsigned long type, unsigned long vector,
  45           unsigned long la_ptr, struct pt_regs *regs)
  46 {
  47         struct pt_regs *old_regs;
  48
  49         /*
  50          * Disable interrupts during IRQ handling.
  51          * Note that there is no matching local_irq_enable() due to
  52          * severe problems with RTI at IPL0 and some MILO PALcode
  53          * (namely LX164).
  54          */
  55         local_irq_disable();
  56         switch (type) {
  57         case 0:
  58 #ifdef CONFIG_SMP
  59                 handle_ipi(regs);
  60                 return;
  61 #else
  62                 irq_err_count++;
  63                 printk(KERN_CRIT "Interprocessor interrupt? "
  64                        "You must be kidding!\n");
  65 #endif
  66                 break;
  67         case 1:
  68                 old_regs = set_irq_regs(regs);
  69                 handle_irq(RTC_IRQ);
  70                 set_irq_regs(old_regs);
  71                 return;
  72         case 2:
  73                 old_regs = set_irq_regs(regs);
  74                 alpha_mv.machine_check(vector, la_ptr);
  75                 set_irq_regs(old_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                     const char *machine, int expected)
 129 {
 130         struct el_common *mchk_header;
 131         const char *reason;
 132
 133         /*
 134          * See if the machine check is due to a badaddr() and if so,
 135          * ignore it.
 136          */
 137
 138 #ifdef CONFIG_VERBOSE_MCHECK
 139         if (alpha_verbose_mcheck > 1) {
 140                 printk(KERN_CRIT "%s machine check %s\n", machine,
 141                        expected ? "expected." : "NOT expected!!!");
 142         }
 143 #endif
 144
 145         if (expected) {
 146                 int cpu = smp_processor_id();
 147                 mcheck_expected(cpu) = 0;
 148                 mcheck_taken(cpu) = 1;
 149                 return;
 150         }
 151
 152         mchk_header = (struct el_common *)la_ptr;
 153
 154         printk(KERN_CRIT "%s machine check: vector=0x%lx pc=0x%lx code=0x%x\n",
 155                machine, vector, get_irq_regs()->pc, mchk_header->code);
 156
 157         switch (mchk_header->code) {
 158         /* Machine check reasons.  Defined according to PALcode sources.  */
 159         case 0x80: reason = "tag parity error"; break;
 160         case 0x82: reason = "tag control parity error"; break;
 161         case 0x84: reason = "generic hard error"; break;
 162         case 0x86: reason = "correctable ECC error"; break;
 163         case 0x88: reason = "uncorrectable ECC error"; break;
 164         case 0x8A: reason = "OS-specific PAL bugcheck"; break;
 165         case 0x90: reason = "callsys in kernel mode"; break;
 166         case 0x96: reason = "i-cache read retryable error"; break;
 167         case 0x98: reason = "processor detected hard error"; break;
 168
 169         /* System specific (these are for Alcor, at least): */
 170         case 0x202: reason = "system detected hard error"; break;
 171         case 0x203: reason = "system detected uncorrectable ECC error"; break;
 172         case 0x204: reason = "SIO SERR occurred on PCI bus"; break;
 173         case 0x205: reason = "parity error detected by core logic"; break;
 174         case 0x206: reason = "SIO IOCHK occurred on ISA bus"; break;
 175         case 0x207: reason = "non-existent memory error"; break;
 176         case 0x208: reason = "MCHK_K_DCSR"; break;
 177         case 0x209: reason = "PCI SERR detected"; break;
 178         case 0x20b: reason = "PCI data parity error detected"; break;
 179         case 0x20d: reason = "PCI address parity error detected"; break;
 180         case 0x20f: reason = "PCI master abort error"; break;
 181         case 0x211: reason = "PCI target abort error"; break;
 182         case 0x213: reason = "scatter/gather PTE invalid error"; break;
 183         case 0x215: reason = "flash ROM write error"; break;
 184         case 0x217: reason = "IOA timeout detected"; break;
 185         case 0x219: reason = "IOCHK#, EISA add-in board parity or other catastrophic error"; break;
 186         case 0x21b: reason = "EISA fail-safe timer timeout"; break;
 187         case 0x21d: reason = "EISA bus time-out"; break;
 188         case 0x21f: reason = "EISA software generated NMI"; break;
 189         case 0x221: reason = "unexpected ev5 IRQ[3] interrupt"; break;
 190         default: reason = "unknown"; break;
 191         }
 192
 193         printk(KERN_CRIT "machine check type: %s%s\n",
 194                reason, mchk_header->retry ? " (retryable)" : "");
 195
 196         dik_show_regs(get_irq_regs(), NULL);
 197
 198 #ifdef CONFIG_VERBOSE_MCHECK
 199         if (alpha_verbose_mcheck > 1) {
 200                 /* Dump the logout area to give all info.  */
 201                 unsigned long *ptr = (unsigned long *)la_ptr;
 202                 long i;
 203                 for (i = 0; i < mchk_header->size / sizeof(long); i += 2) {
 204                         printk(KERN_CRIT "   +%8lx %016lx %016lx\n",
 205                                i*sizeof(long), ptr[i], ptr[i+1]);
 206                 }
 207         }
 208 #endif /* CONFIG_VERBOSE_MCHECK */
 209 }
 210
 211 /*
 212  * The special RTC interrupt type.  The interrupt itself was
 213  * processed by PALcode, and comes in via entInt vector 1.
 214  */
 215
 216 struct irqaction timer_irqaction = {
 217         .handler        = rtc_timer_interrupt,
 218         .name           = "timer",
 219 };
 220
 221 void __init
 222 init_rtc_irq(void)
 223 {
 224         irq_set_chip_and_handler_name(RTC_IRQ, &dummy_irq_chip,
 225                                       handle_percpu_irq, "RTC");
 226         setup_irq(RTC_IRQ, &timer_irqaction);
 227 }
 228
 229 /* Dummy irqactions.  */
 230 struct irqaction isa_cascade_irqaction = {
 231         .handler        = no_action,
 232         .name           = "isa-cascade"
 233 };
 234
 235 struct irqaction timer_cascade_irqaction = {
 236         .handler        = no_action,
 237         .name           = "timer-cascade"
 238 };
 239
 240 struct irqaction halt_switch_irqaction = {
 241         .handler        = no_action,
 242         .name           = "halt-switch"
 243 };