1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Alpha specific irq code. 4 */ 5 6 #include <linux/init.h> 7 #include <linux/sched.h> 8 #include <linux/irq.h> 9 #include <linux/kernel_stat.h> 10 #include <linux/module.h> 11 12 #include <asm/machvec.h> 13 #include <asm/dma.h> 14 #include <asm/perf_event.h> 15 #include <asm/mce.h> 16 17 #include "proto.h" 18 #include "irq_impl.h" 19 20 /* Hack minimum IPL during interrupt processing for broken hardware. */ 21 #ifdef CONFIG_ALPHA_BROKEN_IRQ_MASK 22 int __min_ipl; 23 EXPORT_SYMBOL(__min_ipl); 24 #endif 25 26 /* 27 * Performance counter hook. A module can override this to 28 * do something useful. 29 */ 30 static void 31 dummy_perf(unsigned long vector, struct pt_regs *regs) 32 { 33 irq_err_count++; 34 printk(KERN_CRIT "Performance counter interrupt!\n"); 35 } 36 37 void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf; 38 EXPORT_SYMBOL(perf_irq); 39 40 /* 41 * The main interrupt entry point. 42 */ 43 44 asmlinkage void 45 do_entInt(unsigned long type, unsigned long vector, 46 unsigned long la_ptr, struct pt_regs *regs) 47 { 48 struct pt_regs *old_regs; 49 50 /* 51 * Disable interrupts during IRQ handling. 52 * Note that there is no matching local_irq_enable() due to 53 * severe problems with RTI at IPL0 and some MILO PALcode 54 * (namely LX164). 55 */ 56 local_irq_disable(); 57 switch (type) { 58 case 0: 59 #ifdef CONFIG_SMP 60 handle_ipi(regs); 61 return; 62 #else 63 irq_err_count++; 64 printk(KERN_CRIT "Interprocessor interrupt? " 65 "You must be kidding!\n"); 66 #endif 67 break; 68 case 1: 69 old_regs = set_irq_regs(regs); 70 handle_irq(RTC_IRQ); 71 set_irq_regs(old_regs); 72 return; 73 case 2: 74 old_regs = set_irq_regs(regs); 75 alpha_mv.machine_check(vector, la_ptr); 76 set_irq_regs(old_regs); 77 return; 78 case 3: 79 old_regs = set_irq_regs(regs); 80 alpha_mv.device_interrupt(vector); 81 set_irq_regs(old_regs); 82 return; 83 case 4: 84 perf_irq(la_ptr, regs); 85 return; 86 default: 87 printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n", 88 type, vector); 89 } 90 printk(KERN_CRIT "PC = %016lx PS=%04lx\n", regs->pc, regs->ps); 91 } 92 93 void __init 94 common_init_isa_dma(void) 95 { 96 outb(0, DMA1_RESET_REG); 97 outb(0, DMA2_RESET_REG); 98 outb(0, DMA1_CLR_MASK_REG); 99 outb(0, DMA2_CLR_MASK_REG); 100 } 101 102 void __init 103 init_IRQ(void) 104 { 105 /* Just in case the platform init_irq() causes interrupts/mchecks 106 (as is the case with RAWHIDE, at least). */ 107 wrent(entInt, 0); 108 109 alpha_mv.init_irq(); 110 } 111 112 /* 113 * machine error checks 114 */ 115 #define MCHK_K_TPERR 0x0080 116 #define MCHK_K_TCPERR 0x0082 117 #define MCHK_K_HERR 0x0084 118 #define MCHK_K_ECC_C 0x0086 119 #define MCHK_K_ECC_NC 0x0088 120 #define MCHK_K_OS_BUGCHECK 0x008A 121 #define MCHK_K_PAL_BUGCHECK 0x0090 122 123 #ifndef CONFIG_SMP 124 struct mcheck_info __mcheck_info; 125 #endif 126 127 void 128 process_mcheck_info(unsigned long vector, unsigned long la_ptr, 129 const char *machine, int expected) 130 { 131 struct el_common *mchk_header; 132 const char *reason; 133 134 /* 135 * See if the machine check is due to a badaddr() and if so, 136 * ignore it. 137 */ 138 139 #ifdef CONFIG_VERBOSE_MCHECK 140 if (alpha_verbose_mcheck > 1) { 141 printk(KERN_CRIT "%s machine check %s\n", machine, 142 expected ? "expected." : "NOT expected!!!"); 143 } 144 #endif 145 146 if (expected) { 147 int cpu = smp_processor_id(); 148 mcheck_expected(cpu) = 0; 149 mcheck_taken(cpu) = 1; 150 return; 151 } 152 153 mchk_header = (struct el_common *)la_ptr; 154 155 printk(KERN_CRIT "%s machine check: vector=0x%lx pc=0x%lx code=0x%x\n", 156 machine, vector, get_irq_regs()->pc, mchk_header->code); 157 158 switch (mchk_header->code) { 159 /* Machine check reasons. Defined according to PALcode sources. */ 160 case 0x80: reason = "tag parity error"; break; 161 case 0x82: reason = "tag control parity error"; break; 162 case 0x84: reason = "generic hard error"; break; 163 case 0x86: reason = "correctable ECC error"; break; 164 case 0x88: reason = "uncorrectable ECC error"; break; 165 case 0x8A: reason = "OS-specific PAL bugcheck"; break; 166 case 0x90: reason = "callsys in kernel mode"; break; 167 case 0x96: reason = "i-cache read retryable error"; break; 168 case 0x98: reason = "processor detected hard error"; break; 169 170 /* System specific (these are for Alcor, at least): */ 171 case 0x202: reason = "system detected hard error"; break; 172 case 0x203: reason = "system detected uncorrectable ECC error"; break; 173 case 0x204: reason = "SIO SERR occurred on PCI bus"; break; 174 case 0x205: reason = "parity error detected by core logic"; break; 175 case 0x206: reason = "SIO IOCHK occurred on ISA bus"; break; 176 case 0x207: reason = "non-existent memory error"; break; 177 case 0x208: reason = "MCHK_K_DCSR"; break; 178 case 0x209: reason = "PCI SERR detected"; break; 179 case 0x20b: reason = "PCI data parity error detected"; break; 180 case 0x20d: reason = "PCI address parity error detected"; break; 181 case 0x20f: reason = "PCI master abort error"; break; 182 case 0x211: reason = "PCI target abort error"; break; 183 case 0x213: reason = "scatter/gather PTE invalid error"; break; 184 case 0x215: reason = "flash ROM write error"; break; 185 case 0x217: reason = "IOA timeout detected"; break; 186 case 0x219: reason = "IOCHK#, EISA add-in board parity or other catastrophic error"; break; 187 case 0x21b: reason = "EISA fail-safe timer timeout"; break; 188 case 0x21d: reason = "EISA bus time-out"; break; 189 case 0x21f: reason = "EISA software generated NMI"; break; 190 case 0x221: reason = "unexpected ev5 IRQ[3] interrupt"; break; 191 default: reason = "unknown"; break; 192 } 193 194 printk(KERN_CRIT "machine check type: %s%s\n", 195 reason, mchk_header->retry ? " (retryable)" : ""); 196 197 dik_show_regs(get_irq_regs(), NULL); 198 199 #ifdef CONFIG_VERBOSE_MCHECK 200 if (alpha_verbose_mcheck > 1) { 201 /* Dump the logout area to give all info. */ 202 unsigned long *ptr = (unsigned long *)la_ptr; 203 long i; 204 for (i = 0; i < mchk_header->size / sizeof(long); i += 2) { 205 printk(KERN_CRIT " +%8lx %016lx %016lx\n", 206 i*sizeof(long), ptr[i], ptr[i+1]); 207 } 208 } 209 #endif /* CONFIG_VERBOSE_MCHECK */ 210 } 211 212 /* 213 * The special RTC interrupt type. The interrupt itself was 214 * processed by PALcode, and comes in via entInt vector 1. 215 */ 216 void __init 217 init_rtc_irq(irq_handler_t handler) 218 { 219 irq_set_chip_and_handler_name(RTC_IRQ, &dummy_irq_chip, 220 handle_percpu_irq, "RTC"); 221 if (!handler) 222 handler = rtc_timer_interrupt; 223 if (request_irq(RTC_IRQ, handler, 0, "timer", NULL)) 224 pr_err("Failed to register timer interrupt\n"); 225 } 226