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