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 15 #include "proto.h" 16 #include "irq_impl.h" 17 18 /* Hack minimum IPL during interrupt processing for broken hardware. */ 19 #ifdef CONFIG_ALPHA_BROKEN_IRQ_MASK 20 int __min_ipl; 21 EXPORT_SYMBOL(__min_ipl); 22 #endif 23 24 /* 25 * Performance counter hook. A module can override this to 26 * do something useful. 27 */ 28 static void 29 dummy_perf(unsigned long vector, struct pt_regs *regs) 30 { 31 irq_err_count++; 32 printk(KERN_CRIT "Performance counter interrupt!\n"); 33 } 34 35 void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf; 36 EXPORT_SYMBOL(perf_irq); 37 38 /* 39 * The main interrupt entry point. 40 */ 41 42 asmlinkage void 43 do_entInt(unsigned long type, unsigned long vector, 44 unsigned long la_ptr, struct pt_regs *regs) 45 { 46 struct pt_regs *old_regs; 47 switch (type) { 48 case 0: 49 #ifdef CONFIG_SMP 50 handle_ipi(regs); 51 return; 52 #else 53 irq_err_count++; 54 printk(KERN_CRIT "Interprocessor interrupt? " 55 "You must be kidding!\n"); 56 #endif 57 break; 58 case 1: 59 old_regs = set_irq_regs(regs); 60 #ifdef CONFIG_SMP 61 { 62 long cpu; 63 64 local_irq_disable(); 65 smp_percpu_timer_interrupt(regs); 66 cpu = smp_processor_id(); 67 if (cpu != boot_cpuid) { 68 kstat_incr_irqs_this_cpu(RTC_IRQ, irq_to_desc(RTC_IRQ)); 69 } else { 70 handle_irq(RTC_IRQ); 71 } 72 } 73 #else 74 handle_irq(RTC_IRQ); 75 #endif 76 set_irq_regs(old_regs); 77 return; 78 case 2: 79 old_regs = set_irq_regs(regs); 80 alpha_mv.machine_check(vector, la_ptr); 81 set_irq_regs(old_regs); 82 return; 83 case 3: 84 old_regs = set_irq_regs(regs); 85 alpha_mv.device_interrupt(vector); 86 set_irq_regs(old_regs); 87 return; 88 case 4: 89 perf_irq(la_ptr, regs); 90 return; 91 default: 92 printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n", 93 type, vector); 94 } 95 printk(KERN_CRIT "PC = %016lx PS=%04lx\n", regs->pc, regs->ps); 96 } 97 98 void __init 99 common_init_isa_dma(void) 100 { 101 outb(0, DMA1_RESET_REG); 102 outb(0, DMA2_RESET_REG); 103 outb(0, DMA1_CLR_MASK_REG); 104 outb(0, DMA2_CLR_MASK_REG); 105 } 106 107 void __init 108 init_IRQ(void) 109 { 110 /* Just in case the platform init_irq() causes interrupts/mchecks 111 (as is the case with RAWHIDE, at least). */ 112 wrent(entInt, 0); 113 114 alpha_mv.init_irq(); 115 116 init_hw_perf_events(); 117 } 118 119 /* 120 * machine error checks 121 */ 122 #define MCHK_K_TPERR 0x0080 123 #define MCHK_K_TCPERR 0x0082 124 #define MCHK_K_HERR 0x0084 125 #define MCHK_K_ECC_C 0x0086 126 #define MCHK_K_ECC_NC 0x0088 127 #define MCHK_K_OS_BUGCHECK 0x008A 128 #define MCHK_K_PAL_BUGCHECK 0x0090 129 130 #ifndef CONFIG_SMP 131 struct mcheck_info __mcheck_info; 132 #endif 133 134 void 135 process_mcheck_info(unsigned long vector, unsigned long la_ptr, 136 const char *machine, int expected) 137 { 138 struct el_common *mchk_header; 139 const char *reason; 140 141 /* 142 * See if the machine check is due to a badaddr() and if so, 143 * ignore it. 144 */ 145 146 #ifdef CONFIG_VERBOSE_MCHECK 147 if (alpha_verbose_mcheck > 1) { 148 printk(KERN_CRIT "%s machine check %s\n", machine, 149 expected ? "expected." : "NOT expected!!!"); 150 } 151 #endif 152 153 if (expected) { 154 int cpu = smp_processor_id(); 155 mcheck_expected(cpu) = 0; 156 mcheck_taken(cpu) = 1; 157 return; 158 } 159 160 mchk_header = (struct el_common *)la_ptr; 161 162 printk(KERN_CRIT "%s machine check: vector=0x%lx pc=0x%lx code=0x%x\n", 163 machine, vector, get_irq_regs()->pc, mchk_header->code); 164 165 switch (mchk_header->code) { 166 /* Machine check reasons. Defined according to PALcode sources. */ 167 case 0x80: reason = "tag parity error"; break; 168 case 0x82: reason = "tag control parity error"; break; 169 case 0x84: reason = "generic hard error"; break; 170 case 0x86: reason = "correctable ECC error"; break; 171 case 0x88: reason = "uncorrectable ECC error"; break; 172 case 0x8A: reason = "OS-specific PAL bugcheck"; break; 173 case 0x90: reason = "callsys in kernel mode"; break; 174 case 0x96: reason = "i-cache read retryable error"; break; 175 case 0x98: reason = "processor detected hard error"; break; 176 177 /* System specific (these are for Alcor, at least): */ 178 case 0x202: reason = "system detected hard error"; break; 179 case 0x203: reason = "system detected uncorrectable ECC error"; break; 180 case 0x204: reason = "SIO SERR occurred on PCI bus"; break; 181 case 0x205: reason = "parity error detected by core logic"; break; 182 case 0x206: reason = "SIO IOCHK occurred on ISA bus"; break; 183 case 0x207: reason = "non-existent memory error"; break; 184 case 0x208: reason = "MCHK_K_DCSR"; break; 185 case 0x209: reason = "PCI SERR detected"; break; 186 case 0x20b: reason = "PCI data parity error detected"; break; 187 case 0x20d: reason = "PCI address parity error detected"; break; 188 case 0x20f: reason = "PCI master abort error"; break; 189 case 0x211: reason = "PCI target abort error"; break; 190 case 0x213: reason = "scatter/gather PTE invalid error"; break; 191 case 0x215: reason = "flash ROM write error"; break; 192 case 0x217: reason = "IOA timeout detected"; break; 193 case 0x219: reason = "IOCHK#, EISA add-in board parity or other catastrophic error"; break; 194 case 0x21b: reason = "EISA fail-safe timer timeout"; break; 195 case 0x21d: reason = "EISA bus time-out"; break; 196 case 0x21f: reason = "EISA software generated NMI"; break; 197 case 0x221: reason = "unexpected ev5 IRQ[3] interrupt"; break; 198 default: reason = "unknown"; break; 199 } 200 201 printk(KERN_CRIT "machine check type: %s%s\n", 202 reason, mchk_header->retry ? " (retryable)" : ""); 203 204 dik_show_regs(get_irq_regs(), NULL); 205 206 #ifdef CONFIG_VERBOSE_MCHECK 207 if (alpha_verbose_mcheck > 1) { 208 /* Dump the logout area to give all info. */ 209 unsigned long *ptr = (unsigned long *)la_ptr; 210 long i; 211 for (i = 0; i < mchk_header->size / sizeof(long); i += 2) { 212 printk(KERN_CRIT " +%8lx %016lx %016lx\n", 213 i*sizeof(long), ptr[i], ptr[i+1]); 214 } 215 } 216 #endif /* CONFIG_VERBOSE_MCHECK */ 217 } 218 219 /* 220 * The special RTC interrupt type. The interrupt itself was 221 * processed by PALcode, and comes in via entInt vector 1. 222 */ 223 224 static void rtc_enable_disable(unsigned int irq) { } 225 static unsigned int rtc_startup(unsigned int irq) { return 0; } 226 227 struct irqaction timer_irqaction = { 228 .handler = timer_interrupt, 229 .flags = IRQF_DISABLED, 230 .name = "timer", 231 }; 232 233 static struct irq_chip rtc_irq_type = { 234 .name = "RTC", 235 .startup = rtc_startup, 236 .shutdown = rtc_enable_disable, 237 .enable = rtc_enable_disable, 238 .disable = rtc_enable_disable, 239 .ack = rtc_enable_disable, 240 .end = rtc_enable_disable, 241 }; 242 243 void __init 244 init_rtc_irq(void) 245 { 246 irq_desc[RTC_IRQ].status = IRQ_DISABLED; 247 irq_desc[RTC_IRQ].chip = &rtc_irq_type; 248 setup_irq(RTC_IRQ, &timer_irqaction); 249 } 250 251 /* Dummy irqactions. */ 252 struct irqaction isa_cascade_irqaction = { 253 .handler = no_action, 254 .name = "isa-cascade" 255 }; 256 257 struct irqaction timer_cascade_irqaction = { 258 .handler = no_action, 259 .name = "timer-cascade" 260 }; 261 262 struct irqaction halt_switch_irqaction = { 263 .handler = no_action, 264 .name = "halt-switch" 265 }; 266