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Linux/arch/alpha/kernel/irq_alpha.c

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

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