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
  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 EXPORT_SYMBOL(__min_ipl);
  21 #endif
  22
  23 /*
  24  * Performance counter hook.  A module can override this to
  25  * do something useful.
  26  */
  27 static void
  28 dummy_perf(unsigned long vector, struct pt_regs *regs)
  29 {
  30         irq_err_count++;
  31         printk(KERN_CRIT "Performance counter interrupt!\n");
  32 }
  33
  34 void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf;
  35 EXPORT_SYMBOL(perf_irq);
  36
  37 /*
  38  * The main interrupt entry point.
  39  */
  40
  41 asmlinkage void
  42 do_entInt(unsigned long type, unsigned long vector,
  43           unsigned long la_ptr, struct pt_regs *regs)
  44 {
  45         struct pt_regs *old_regs;
  46         switch (type) {
  47         case 0:
  48 #ifdef CONFIG_SMP
  49                 handle_ipi(regs);
  50                 return;
  51 #else
  52                 irq_err_count++;
  53                 printk(KERN_CRIT "Interprocessor interrupt? "
  54                        "You must be kidding!\n");
  55 #endif
  56                 break;
  57         case 1:
  58                 old_regs = set_irq_regs(regs);
  59 #ifdef CONFIG_SMP
  60           {
  61                 long cpu;
  62
  63                 local_irq_disable();
  64                 smp_percpu_timer_interrupt(regs);
  65                 cpu = smp_processor_id();
  66                 if (cpu != boot_cpuid) {
  67                         kstat_incr_irqs_this_cpu(RTC_IRQ, irq_to_desc(RTC_IRQ));
  68                 } else {
  69                         handle_irq(RTC_IRQ);
  70                 }
  71           }
  72 #else
  73                 handle_irq(RTC_IRQ);
  74 #endif
  75                 set_irq_regs(old_regs);
  76                 return;
  77         case 2:
  78                 old_regs = set_irq_regs(regs);
  79                 alpha_mv.machine_check(vector, la_ptr);
  80                 set_irq_regs(old_regs);
  81                 return;
  82         case 3:
  83                 old_regs = set_irq_regs(regs);
  84                 alpha_mv.device_interrupt(vector);
  85                 set_irq_regs(old_regs);
  86                 return;
  87         case 4:
  88                 perf_irq(la_ptr, regs);
  89                 return;
  90         default:
  91                 printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n",
  92                        type, vector);
  93         }
  94         printk(KERN_CRIT "PC = %016lx PS=%04lx\n", regs->pc, regs->ps);
  95 }
  96
  97 void __init
  98 common_init_isa_dma(void)
  99 {
 100         outb(0, DMA1_RESET_REG);
 101         outb(0, DMA2_RESET_REG);
 102         outb(0, DMA1_CLR_MASK_REG);
 103         outb(0, DMA2_CLR_MASK_REG);
 104 }
 105
 106 void __init
 107 init_IRQ(void)
 108 {
 109         /* Just in case the platform init_irq() causes interrupts/mchecks
 110            (as is the case with RAWHIDE, at least).  */
 111         wrent(entInt, 0);
 112
 113         alpha_mv.init_irq();
 114 }
 115
 116 /*
 117  * machine error checks
 118  */
 119 #define MCHK_K_TPERR           0x0080
 120 #define MCHK_K_TCPERR          0x0082
 121 #define MCHK_K_HERR            0x0084
 122 #define MCHK_K_ECC_C           0x0086
 123 #define MCHK_K_ECC_NC          0x0088
 124 #define MCHK_K_OS_BUGCHECK     0x008A
 125 #define MCHK_K_PAL_BUGCHECK    0x0090
 126
 127 #ifndef CONFIG_SMP
 128 struct mcheck_info __mcheck_info;
 129 #endif
 130
 131 void
 132 process_mcheck_info(unsigned long vector, unsigned long la_ptr,
 133                     const char *machine, int expected)
 134 {
 135         struct el_common *mchk_header;
 136         const char *reason;
 137
 138         /*
 139          * See if the machine check is due to a badaddr() and if so,
 140          * ignore it.
 141          */
 142
 143 #ifdef CONFIG_VERBOSE_MCHECK
 144         if (alpha_verbose_mcheck > 1) {
 145                 printk(KERN_CRIT "%s machine check %s\n", machine,
 146                        expected ? "expected." : "NOT expected!!!");
 147         }
 148 #endif
 149
 150         if (expected) {
 151                 int cpu = smp_processor_id();
 152                 mcheck_expected(cpu) = 0;
 153                 mcheck_taken(cpu) = 1;
 154                 return;
 155         }
 156
 157         mchk_header = (struct el_common *)la_ptr;
 158
 159         printk(KERN_CRIT "%s machine check: vector=0x%lx pc=0x%lx code=0x%x\n",
 160                machine, vector, get_irq_regs()->pc, mchk_header->code);
 161
 162         switch (mchk_header->code) {
 163         /* Machine check reasons.  Defined according to PALcode sources.  */
 164         case 0x80: reason = "tag parity error"; break;
 165         case 0x82: reason = "tag control parity error"; break;
 166         case 0x84: reason = "generic hard error"; break;
 167         case 0x86: reason = "correctable ECC error"; break;
 168         case 0x88: reason = "uncorrectable ECC error"; break;
 169         case 0x8A: reason = "OS-specific PAL bugcheck"; break;
 170         case 0x90: reason = "callsys in kernel mode"; break;
 171         case 0x96: reason = "i-cache read retryable error"; break;
 172         case 0x98: reason = "processor detected hard error"; break;
 173
 174         /* System specific (these are for Alcor, at least): */
 175         case 0x202: reason = "system detected hard error"; break;
 176         case 0x203: reason = "system detected uncorrectable ECC error"; break;
 177         case 0x204: reason = "SIO SERR occurred on PCI bus"; break;
 178         case 0x205: reason = "parity error detected by core logic"; break;
 179         case 0x206: reason = "SIO IOCHK occurred on ISA bus"; break;
 180         case 0x207: reason = "non-existent memory error"; break;
 181         case 0x208: reason = "MCHK_K_DCSR"; break;
 182         case 0x209: reason = "PCI SERR detected"; break;
 183         case 0x20b: reason = "PCI data parity error detected"; break;
 184         case 0x20d: reason = "PCI address parity error detected"; break;
 185         case 0x20f: reason = "PCI master abort error"; break;
 186         case 0x211: reason = "PCI target abort error"; break;
 187         case 0x213: reason = "scatter/gather PTE invalid error"; break;
 188         case 0x215: reason = "flash ROM write error"; break;
 189         case 0x217: reason = "IOA timeout detected"; break;
 190         case 0x219: reason = "IOCHK#, EISA add-in board parity or other catastrophic error"; break;
 191         case 0x21b: reason = "EISA fail-safe timer timeout"; break;
 192         case 0x21d: reason = "EISA bus time-out"; break;
 193         case 0x21f: reason = "EISA software generated NMI"; break;
 194         case 0x221: reason = "unexpected ev5 IRQ[3] interrupt"; break;
 195         default: reason = "unknown"; break;
 196         }
 197
 198         printk(KERN_CRIT "machine check type: %s%s\n",
 199                reason, mchk_header->retry ? " (retryable)" : "");
 200
 201         dik_show_regs(get_irq_regs(), NULL);
 202
 203 #ifdef CONFIG_VERBOSE_MCHECK
 204         if (alpha_verbose_mcheck > 1) {
 205                 /* Dump the logout area to give all info.  */
 206                 unsigned long *ptr = (unsigned long *)la_ptr;
 207                 long i;
 208                 for (i = 0; i < mchk_header->size / sizeof(long); i += 2) {
 209                         printk(KERN_CRIT "   +%8lx %016lx %016lx\n",
 210                                i*sizeof(long), ptr[i], ptr[i+1]);
 211                 }
 212         }
 213 #endif /* CONFIG_VERBOSE_MCHECK */
 214 }
 215
 216 /*
 217  * The special RTC interrupt type.  The interrupt itself was
 218  * processed by PALcode, and comes in via entInt vector 1.
 219  */
 220
 221 static void rtc_enable_disable(unsigned int irq) { }
 222 static unsigned int rtc_startup(unsigned int irq) { return 0; }
 223
 224 struct irqaction timer_irqaction = {
 225         .handler        = timer_interrupt,
 226         .flags          = IRQF_DISABLED,
 227         .name           = "timer",
 228 };
 229
 230 static struct irq_chip rtc_irq_type = {
 231         .typename       = "RTC",
 232         .startup        = rtc_startup,
 233         .shutdown       = rtc_enable_disable,
 234         .enable         = rtc_enable_disable,
 235         .disable        = rtc_enable_disable,
 236         .ack            = rtc_enable_disable,
 237         .end            = rtc_enable_disable,
 238 };
 239
 240 void __init
 241 init_rtc_irq(void)
 242 {
 243         irq_desc[RTC_IRQ].status = IRQ_DISABLED;
 244         irq_desc[RTC_IRQ].chip = &rtc_irq_type;
 245         setup_irq(RTC_IRQ, &timer_irqaction);
 246 }
 247
 248 /* Dummy irqactions.  */
 249 struct irqaction isa_cascade_irqaction = {
 250         .handler        = no_action,
 251         .name           = "isa-cascade"
 252 };
 253
 254 struct irqaction timer_cascade_irqaction = {
 255         .handler        = no_action,
 256         .name           = "timer-cascade"
 257 };
 258
 259 struct irqaction halt_switch_irqaction = {
 260         .handler        = no_action,
 261         .name           = "halt-switch"
 262 };