release/src-rt-6.x.4708/linux/linux-2.6.36/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
  15 #include "proto.h"
  16 #include "irq_impl.h"
  17
  18 /* Hack minimum IPL during interrupt processing for broken hardware.  */
  19 #ifdef CONFIG_ALPHA_BROKEN_IRQ_MASK
  20 int __min_ipl;
  21 EXPORT_SYMBOL(__min_ipl);
  22 #endif
  23
  24 /*
  25  * Performance counter hook.  A module can override this to
  26  * do something useful.
  27  */
  28 static void
  29 dummy_perf(unsigned long vector, struct pt_regs *regs)
  30 {
  31         irq_err_count++;
  32         printk(KERN_CRIT "Performance counter interrupt!\n");
  33 }
  34
  35 void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf;
  36 EXPORT_SYMBOL(perf_irq);
  37
  38 /*
  39  * The main interrupt entry point.
  40  */
  41
  42 asmlinkage void
  43 do_entInt(unsigned long type, unsigned long vector,
  44           unsigned long la_ptr, struct pt_regs *regs)
  45 {
  46         struct pt_regs *old_regs;
  47         switch (type) {
  48         case 0:
  49 #ifdef CONFIG_SMP
  50                 handle_ipi(regs);
  51                 return;
  52 #else
  53                 irq_err_count++;
  54                 printk(KERN_CRIT "Interprocessor interrupt? "
  55                        "You must be kidding!\n");
  56 #endif
  57                 break;
  58         case 1:
  59                 old_regs = set_irq_regs(regs);
  60 #ifdef CONFIG_SMP
  61           {
  62                 long cpu;
  63
  64                 local_irq_disable();
  65                 smp_percpu_timer_interrupt(regs);
  66                 cpu = smp_processor_id();
  67                 if (cpu != boot_cpuid) {
  68                         kstat_incr_irqs_this_cpu(RTC_IRQ, irq_to_desc(RTC_IRQ));
  69                 } else {
  70                         handle_irq(RTC_IRQ);
  71                 }
  72           }
  73 #else
  74                 handle_irq(RTC_IRQ);
  75 #endif
  76                 set_irq_regs(old_regs);
  77                 return;
  78         case 2:
  79                 old_regs = set_irq_regs(regs);
  80                 alpha_mv.machine_check(vector, la_ptr);
  81                 set_irq_regs(old_regs);
  82                 return;
  83         case 3:
  84                 old_regs = set_irq_regs(regs);
  85                 alpha_mv.device_interrupt(vector);
  86                 set_irq_regs(old_regs);
  87                 return;
  88         case 4:
  89                 perf_irq(la_ptr, regs);
  90                 return;
  91         default:
  92                 printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n",
  93                        type, vector);
  94         }
  95         printk(KERN_CRIT "PC = %016lx PS=%04lx\n", regs->pc, regs->ps);
  96 }
  97
  98 void __init
  99 common_init_isa_dma(void)
 100 {
 101         outb(0, DMA1_RESET_REG);
 102         outb(0, DMA2_RESET_REG);
 103         outb(0, DMA1_CLR_MASK_REG);
 104         outb(0, DMA2_CLR_MASK_REG);
 105 }
 106
 107 void __init
 108 init_IRQ(void)
 109 {
 110         /* Just in case the platform init_irq() causes interrupts/mchecks
 111            (as is the case with RAWHIDE, at least).  */
 112         wrent(entInt, 0);
 113
 114         alpha_mv.init_irq();
 115
 116         init_hw_perf_events();
 117 }
 118
 119 /*
 120  * machine error checks
 121  */
 122 #define MCHK_K_TPERR           0x0080
 123 #define MCHK_K_TCPERR          0x0082
 124 #define MCHK_K_HERR            0x0084
 125 #define MCHK_K_ECC_C           0x0086
 126 #define MCHK_K_ECC_NC          0x0088
 127 #define MCHK_K_OS_BUGCHECK     0x008A
 128 #define MCHK_K_PAL_BUGCHECK    0x0090
 129
 130 #ifndef CONFIG_SMP
 131 struct mcheck_info __mcheck_info;
 132 #endif
 133
 134 void
 135 process_mcheck_info(unsigned long vector, unsigned long la_ptr,
 136                     const char *machine, int expected)
 137 {
 138         struct el_common *mchk_header;
 139         const char *reason;
 140
 141         /*
 142          * See if the machine check is due to a badaddr() and if so,
 143          * ignore it.
 144          */
 145
 146 #ifdef CONFIG_VERBOSE_MCHECK
 147         if (alpha_verbose_mcheck > 1) {
 148                 printk(KERN_CRIT "%s machine check %s\n", machine,
 149                        expected ? "expected." : "NOT expected!!!");
 150         }
 151 #endif
 152
 153         if (expected) {
 154                 int cpu = smp_processor_id();
 155                 mcheck_expected(cpu) = 0;
 156                 mcheck_taken(cpu) = 1;
 157                 return;
 158         }
 159
 160         mchk_header = (struct el_common *)la_ptr;
 161
 162         printk(KERN_CRIT "%s machine check: vector=0x%lx pc=0x%lx code=0x%x\n",
 163                machine, vector, get_irq_regs()->pc, mchk_header->code);
 164
 165         switch (mchk_header->code) {
 166         /* Machine check reasons.  Defined according to PALcode sources.  */
 167         case 0x80: reason = "tag parity error"; break;
 168         case 0x82: reason = "tag control parity error"; break;
 169         case 0x84: reason = "generic hard error"; break;
 170         case 0x86: reason = "correctable ECC error"; break;
 171         case 0x88: reason = "uncorrectable ECC error"; break;
 172         case 0x8A: reason = "OS-specific PAL bugcheck"; break;
 173         case 0x90: reason = "callsys in kernel mode"; break;
 174         case 0x96: reason = "i-cache read retryable error"; break;
 175         case 0x98: reason = "processor detected hard error"; break;
 176
 177         /* System specific (these are for Alcor, at least): */
 178         case 0x202: reason = "system detected hard error"; break;
 179         case 0x203: reason = "system detected uncorrectable ECC error"; break;
 180         case 0x204: reason = "SIO SERR occurred on PCI bus"; break;
 181         case 0x205: reason = "parity error detected by core logic"; break;
 182         case 0x206: reason = "SIO IOCHK occurred on ISA bus"; break;
 183         case 0x207: reason = "non-existent memory error"; break;
 184         case 0x208: reason = "MCHK_K_DCSR"; break;
 185         case 0x209: reason = "PCI SERR detected"; break;
 186         case 0x20b: reason = "PCI data parity error detected"; break;
 187         case 0x20d: reason = "PCI address parity error detected"; break;
 188         case 0x20f: reason = "PCI master abort error"; break;
 189         case 0x211: reason = "PCI target abort error"; break;
 190         case 0x213: reason = "scatter/gather PTE invalid error"; break;
 191         case 0x215: reason = "flash ROM write error"; break;
 192         case 0x217: reason = "IOA timeout detected"; break;
 193         case 0x219: reason = "IOCHK#, EISA add-in board parity or other catastrophic error"; break;
 194         case 0x21b: reason = "EISA fail-safe timer timeout"; break;
 195         case 0x21d: reason = "EISA bus time-out"; break;
 196         case 0x21f: reason = "EISA software generated NMI"; break;
 197         case 0x221: reason = "unexpected ev5 IRQ[3] interrupt"; break;
 198         default: reason = "unknown"; break;
 199         }
 200
 201         printk(KERN_CRIT "machine check type: %s%s\n",
 202                reason, mchk_header->retry ? " (retryable)" : "");
 203
 204         dik_show_regs(get_irq_regs(), NULL);
 205
 206 #ifdef CONFIG_VERBOSE_MCHECK
 207         if (alpha_verbose_mcheck > 1) {
 208                 /* Dump the logout area to give all info.  */
 209                 unsigned long *ptr = (unsigned long *)la_ptr;
 210                 long i;
 211                 for (i = 0; i < mchk_header->size / sizeof(long); i += 2) {
 212                         printk(KERN_CRIT "   +%8lx %016lx %016lx\n",
 213                                i*sizeof(long), ptr[i], ptr[i+1]);
 214                 }
 215         }
 216 #endif /* CONFIG_VERBOSE_MCHECK */
 217 }
 218
 219 /*
 220  * The special RTC interrupt type.  The interrupt itself was
 221  * processed by PALcode, and comes in via entInt vector 1.
 222  */
 223
 224 static void rtc_enable_disable(unsigned int irq) { }
 225 static unsigned int rtc_startup(unsigned int irq) { return 0; }
 226
 227 struct irqaction timer_irqaction = {
 228         .handler        = timer_interrupt,
 229         .flags          = IRQF_DISABLED,
 230         .name           = "timer",
 231 };
 232
 233 static struct irq_chip rtc_irq_type = {
 234         .name           = "RTC",
 235         .startup        = rtc_startup,
 236         .shutdown       = rtc_enable_disable,
 237         .enable         = rtc_enable_disable,
 238         .disable        = rtc_enable_disable,
 239         .ack            = rtc_enable_disable,
 240         .end            = rtc_enable_disable,
 241 };
 242
 243 void __init
 244 init_rtc_irq(void)
 245 {
 246         irq_desc[RTC_IRQ].status = IRQ_DISABLED;
 247         irq_desc[RTC_IRQ].chip = &rtc_irq_type;
 248         setup_irq(RTC_IRQ, &timer_irqaction);
 249 }
 250
 251 /* Dummy irqactions.  */
 252 struct irqaction isa_cascade_irqaction = {
 253         .handler        = no_action,
 254         .name           = "isa-cascade"
 255 };
 256
 257 struct irqaction timer_cascade_irqaction = {
 258         .handler        = no_action,
 259         .name           = "timer-cascade"
 260 };
 261
 262 struct irqaction halt_switch_irqaction = {
 263         .handler        = no_action,
 264         .name           = "halt-switch"
 265 };