1 // SPDX-License-Identifier: GPL-2.0
3 * Alpha specific irq code.
6 #include <linux/init.h>
7 #include <linux/sched.h>
9 #include <linux/kernel_stat.h>
10 #include <linux/module.h>
12 #include <asm/machvec.h>
14 #include <asm/perf_event.h>
20 /* Hack minimum IPL during interrupt processing for broken hardware. */
21 #ifdef CONFIG_ALPHA_BROKEN_IRQ_MASK
23 EXPORT_SYMBOL(__min_ipl);
27 * Performance counter hook. A module can override this to
28 * do something useful.
31 dummy_perf(unsigned long vector, struct pt_regs *regs)
34 printk(KERN_CRIT "Performance counter interrupt!\n");
37 void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf;
38 EXPORT_SYMBOL(perf_irq);
41 * The main interrupt entry point.
45 do_entInt(unsigned long type, unsigned long vector,
46 unsigned long la_ptr, struct pt_regs *regs)
48 struct pt_regs *old_regs;
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
64 printk(KERN_CRIT "Interprocessor interrupt? "
65 "You must be kidding!\n");
69 old_regs = set_irq_regs(regs);
71 set_irq_regs(old_regs);
74 old_regs = set_irq_regs(regs);
75 alpha_mv.machine_check(vector, la_ptr);
76 set_irq_regs(old_regs);
79 old_regs = set_irq_regs(regs);
80 alpha_mv.device_interrupt(vector);
81 set_irq_regs(old_regs);
84 perf_irq(la_ptr, regs);
87 printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n",
90 printk(KERN_CRIT "PC = %016lx PS=%04lx\n", regs->pc, regs->ps);
94 common_init_isa_dma(void)
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);
105 /* Just in case the platform init_irq() causes interrupts/mchecks
106 (as is the case with RAWHIDE, at least). */
113 * machine error checks
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
124 struct mcheck_info __mcheck_info;
128 process_mcheck_info(unsigned long vector, unsigned long la_ptr,
129 const char *machine, int expected)
131 struct el_common *mchk_header;
135 * See if the machine check is due to a badaddr() and if so,
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!!!");
147 int cpu = smp_processor_id();
148 mcheck_expected(cpu) = 0;
149 mcheck_taken(cpu) = 1;
153 mchk_header = (struct el_common *)la_ptr;
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);
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;
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;
194 printk(KERN_CRIT "machine check type: %s%s\n",
195 reason, mchk_header->retry ? " (retryable)" : "");
197 dik_show_regs(get_irq_regs(), NULL);
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;
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]);
209 #endif /* CONFIG_VERBOSE_MCHECK */
213 * The special RTC interrupt type. The interrupt itself was
214 * processed by PALcode, and comes in via entInt vector 1.
217 init_rtc_irq(irq_handler_t handler)
219 irq_set_chip_and_handler_name(RTC_IRQ, &dummy_irq_chip,
220 handle_percpu_irq, "RTC");
222 handler = rtc_timer_interrupt;
223 if (request_irq(RTC_IRQ, handler, 0, "timer", NULL))
224 pr_err("Failed to register timer interrupt\n");