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 }; 244