1 /* 2 * Alpha specific irq code. 3 */ 4 5 #include <linux/config.h> 6 #include <linux/init.h> 7 #include <linux/sched.h> 8 #include <linux/irq.h> 9 #include <linux/kernel_stat.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 #endif 21 22 /* 23 * Performance counter hook. A module can override this to 24 * do something useful. 25 */ 26 static void 27 dummy_perf(unsigned long vector, struct pt_regs *regs) 28 { 29 irq_err_count++; 30 printk(KERN_CRIT "Performance counter interrupt!\n"); 31 } 32 33 void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf; 34 35 /* 36 * The main interrupt entry point. 37 */ 38 39 asmlinkage void 40 do_entInt(unsigned long type, unsigned long vector, 41 unsigned long la_ptr, struct pt_regs *regs) 42 { 43 switch (type) { 44 case 0: 45 #ifdef CONFIG_SMP 46 handle_ipi(regs); 47 return; 48 #else 49 irq_err_count++; 50 printk(KERN_CRIT "Interprocessor interrupt? " 51 "You must be kidding!\n"); 52 #endif 53 break; 54 case 1: 55 #ifdef CONFIG_SMP 56 { 57 long cpu; 58 59 local_irq_disable(); 60 smp_percpu_timer_interrupt(regs); 61 cpu = smp_processor_id(); 62 if (cpu != boot_cpuid) { 63 kstat_cpu(cpu).irqs[RTC_IRQ]++; 64 } else { 65 handle_irq(RTC_IRQ, regs); 66 } 67 } 68 #else 69 handle_irq(RTC_IRQ, regs); 70 #endif 71 return; 72 case 2: 73 alpha_mv.machine_check(vector, la_ptr, regs); 74 return; 75 case 3: 76 alpha_mv.device_interrupt(vector, regs); 77 return; 78 case 4: 79 perf_irq(la_ptr, regs); 80 return; 81 default: 82 printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n", 83 type, vector); 84 } 85 printk(KERN_CRIT "PC = %016lx PS=%04lx\n", regs->pc, regs->ps); 86 } 87 88 void __init 89 common_init_isa_dma(void) 90 { 91 outb(0, DMA1_RESET_REG); 92 outb(0, DMA2_RESET_REG); 93 outb(0, DMA1_CLR_MASK_REG); 94 outb(0, DMA2_CLR_MASK_REG); 95 } 96 97 void __init 98 init_IRQ(void) 99 { 100 /* Just in case the platform init_irq() causes interrupts/mchecks 101 (as is the case with RAWHIDE, at least). */ 102 wrent(entInt, 0); 103 104 alpha_mv.init_irq(); 105 } 106 107 /* 108 * machine error checks 109 */ 110 #define MCHK_K_TPERR 0x0080 111 #define MCHK_K_TCPERR 0x0082 112 #define MCHK_K_HERR 0x0084 113 #define MCHK_K_ECC_C 0x0086 114 #define MCHK_K_ECC_NC 0x0088 115 #define MCHK_K_OS_BUGCHECK 0x008A 116 #define MCHK_K_PAL_BUGCHECK 0x0090 117 118 #ifndef CONFIG_SMP 119 struct mcheck_info __mcheck_info; 120 #endif 121 122 void 123 process_mcheck_info(unsigned long vector, unsigned long la_ptr, 124 struct pt_regs *regs, const char *machine, 125 int expected) 126 { 127 struct el_common *mchk_header; 128 const char *reason; 129 130 /* 131 * See if the machine check is due to a badaddr() and if so, 132 * ignore it. 133 */ 134 135 #ifdef CONFIG_VERBOSE_MCHECK 136 if (alpha_verbose_mcheck > 1) { 137 printk(KERN_CRIT "%s machine check %s\n", machine, 138 expected ? "expected." : "NOT expected!!!"); 139 } 140 #endif 141 142 if (expected) { 143 int cpu = smp_processor_id(); 144 mcheck_expected(cpu) = 0; 145 mcheck_taken(cpu) = 1; 146 return; 147 } 148 149 mchk_header = (struct el_common *)la_ptr; 150 151 printk(KERN_CRIT "%s machine check: vector=0x%lx pc=0x%lx code=0x%x\n", 152 machine, vector, regs->pc, mchk_header->code); 153 154 switch (mchk_header->code) { 155 /* Machine check reasons. Defined according to PALcode sources. */ 156 case 0x80: reason = "tag parity error"; break; 157 case 0x82: reason = "tag control parity error"; break; 158 case 0x84: reason = "generic hard error"; break; 159 case 0x86: reason = "correctable ECC error"; break; 160 case 0x88: reason = "uncorrectable ECC error"; break; 161 case 0x8A: reason = "OS-specific PAL bugcheck"; break; 162 case 0x90: reason = "callsys in kernel mode"; break; 163 case 0x96: reason = "i-cache read retryable error"; break; 164 case 0x98: reason = "processor detected hard error"; break; 165 166 /* System specific (these are for Alcor, at least): */ 167 case 0x202: reason = "system detected hard error"; break; 168 case 0x203: reason = "system detected uncorrectable ECC error"; break; 169 case 0x204: reason = "SIO SERR occurred on PCI bus"; break; 170 case 0x205: reason = "parity error detected by core logic"; break; 171 case 0x206: reason = "SIO IOCHK occurred on ISA bus"; break; 172 case 0x207: reason = "non-existent memory error"; break; 173 case 0x208: reason = "MCHK_K_DCSR"; break; 174 case 0x209: reason = "PCI SERR detected"; break; 175 case 0x20b: reason = "PCI data parity error detected"; break; 176 case 0x20d: reason = "PCI address parity error detected"; break; 177 case 0x20f: reason = "PCI master abort error"; break; 178 case 0x211: reason = "PCI target abort error"; break; 179 case 0x213: reason = "scatter/gather PTE invalid error"; break; 180 case 0x215: reason = "flash ROM write error"; break; 181 case 0x217: reason = "IOA timeout detected"; break; 182 case 0x219: reason = "IOCHK#, EISA add-in board parity or other catastrophic error"; break; 183 case 0x21b: reason = "EISA fail-safe timer timeout"; break; 184 case 0x21d: reason = "EISA bus time-out"; break; 185 case 0x21f: reason = "EISA software generated NMI"; break; 186 case 0x221: reason = "unexpected ev5 IRQ[3] interrupt"; break; 187 default: reason = "unknown"; break; 188 } 189 190 printk(KERN_CRIT "machine check type: %s%s\n", 191 reason, mchk_header->retry ? " (retryable)" : ""); 192 193 dik_show_regs(regs, NULL); 194 195 #ifdef CONFIG_VERBOSE_MCHECK 196 if (alpha_verbose_mcheck > 1) { 197 /* Dump the logout area to give all info. */ 198 unsigned long *ptr = (unsigned long *)la_ptr; 199 long i; 200 for (i = 0; i < mchk_header->size / sizeof(long); i += 2) { 201 printk(KERN_CRIT " +%8lx %016lx %016lx\n", 202 i*sizeof(long), ptr[i], ptr[i+1]); 203 } 204 } 205 #endif /* CONFIG_VERBOSE_MCHECK */ 206 } 207 208 /* 209 * The special RTC interrupt type. The interrupt itself was 210 * processed by PALcode, and comes in via entInt vector 1. 211 */ 212 213 static void rtc_enable_disable(unsigned int irq) { } 214 static unsigned int rtc_startup(unsigned int irq) { return 0; } 215 216 struct irqaction timer_irqaction = { 217 .handler = timer_interrupt, 218 .flags = SA_INTERRUPT, 219 .name = "timer", 220 }; 221 222 static struct hw_interrupt_type rtc_irq_type = { 223 .typename = "RTC", 224 .startup = rtc_startup, 225 .shutdown = rtc_enable_disable, 226 .enable = rtc_enable_disable, 227 .disable = rtc_enable_disable, 228 .ack = rtc_enable_disable, 229 .end = rtc_enable_disable, 230 }; 231 232 void __init 233 init_rtc_irq(void) 234 { 235 irq_desc[RTC_IRQ].status = IRQ_DISABLED; 236 irq_desc[RTC_IRQ].handler = &rtc_irq_type; 237 setup_irq(RTC_IRQ, &timer_irqaction); 238 } 239 240 /* Dummy irqactions. */ 241 struct irqaction isa_cascade_irqaction = { 242 .handler = no_action, 243 .name = "isa-cascade" 244 }; 245 246 struct irqaction timer_cascade_irqaction = { 247 .handler = no_action, 248 .name = "timer-cascade" 249 }; 250 251 struct irqaction halt_switch_irqaction = { 252 .handler = no_action, 253 .name = "halt-switch" 254 }; 255