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