1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
21da177e4SLinus Torvalds /*
31da177e4SLinus Torvalds * Alpha specific irq code.
41da177e4SLinus Torvalds */
51da177e4SLinus Torvalds
61da177e4SLinus Torvalds #include <linux/init.h>
71da177e4SLinus Torvalds #include <linux/sched.h>
81da177e4SLinus Torvalds #include <linux/irq.h>
91da177e4SLinus Torvalds #include <linux/kernel_stat.h>
10cff52dafSAl Viro #include <linux/module.h>
111da177e4SLinus Torvalds
121da177e4SLinus Torvalds #include <asm/machvec.h>
131da177e4SLinus Torvalds #include <asm/dma.h>
14979f8671SMichael Cree #include <asm/perf_event.h>
15ec221208SDavid Howells #include <asm/mce.h>
161da177e4SLinus Torvalds
171da177e4SLinus Torvalds #include "proto.h"
181da177e4SLinus Torvalds #include "irq_impl.h"
191da177e4SLinus Torvalds
201da177e4SLinus Torvalds /* Hack minimum IPL during interrupt processing for broken hardware. */
211da177e4SLinus Torvalds #ifdef CONFIG_ALPHA_BROKEN_IRQ_MASK
221da177e4SLinus Torvalds int __min_ipl;
23cff52dafSAl Viro EXPORT_SYMBOL(__min_ipl);
241da177e4SLinus Torvalds #endif
251da177e4SLinus Torvalds
261da177e4SLinus Torvalds /*
271da177e4SLinus Torvalds * Performance counter hook. A module can override this to
281da177e4SLinus Torvalds * do something useful.
291da177e4SLinus Torvalds */
301da177e4SLinus Torvalds static void
dummy_perf(unsigned long vector,struct pt_regs * regs)311da177e4SLinus Torvalds dummy_perf(unsigned long vector, struct pt_regs *regs)
321da177e4SLinus Torvalds {
331da177e4SLinus Torvalds irq_err_count++;
341da177e4SLinus Torvalds printk(KERN_CRIT "Performance counter interrupt!\n");
351da177e4SLinus Torvalds }
361da177e4SLinus Torvalds
371da177e4SLinus Torvalds void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf;
38cff52dafSAl Viro EXPORT_SYMBOL(perf_irq);
391da177e4SLinus Torvalds
401da177e4SLinus Torvalds /*
411da177e4SLinus Torvalds * The main interrupt entry point.
421da177e4SLinus Torvalds */
431da177e4SLinus Torvalds
441da177e4SLinus Torvalds asmlinkage void
do_entInt(unsigned long type,unsigned long vector,unsigned long la_ptr,struct pt_regs * regs)451da177e4SLinus Torvalds do_entInt(unsigned long type, unsigned long vector,
461da177e4SLinus Torvalds unsigned long la_ptr, struct pt_regs *regs)
471da177e4SLinus Torvalds {
487ca56053SAl Viro struct pt_regs *old_regs;
49e20800fdSWill Deacon
50e20800fdSWill Deacon /*
51e20800fdSWill Deacon * Disable interrupts during IRQ handling.
52e20800fdSWill Deacon * Note that there is no matching local_irq_enable() due to
53e20800fdSWill Deacon * severe problems with RTI at IPL0 and some MILO PALcode
54e20800fdSWill Deacon * (namely LX164).
55e20800fdSWill Deacon */
56e20800fdSWill Deacon local_irq_disable();
571da177e4SLinus Torvalds switch (type) {
581da177e4SLinus Torvalds case 0:
591da177e4SLinus Torvalds #ifdef CONFIG_SMP
601da177e4SLinus Torvalds handle_ipi(regs);
611da177e4SLinus Torvalds return;
621da177e4SLinus Torvalds #else
631da177e4SLinus Torvalds irq_err_count++;
641da177e4SLinus Torvalds printk(KERN_CRIT "Interprocessor interrupt? "
651da177e4SLinus Torvalds "You must be kidding!\n");
661da177e4SLinus Torvalds #endif
671da177e4SLinus Torvalds break;
681da177e4SLinus Torvalds case 1:
693dbb8c62SAl Viro old_regs = set_irq_regs(regs);
703dbb8c62SAl Viro handle_irq(RTC_IRQ);
713dbb8c62SAl Viro set_irq_regs(old_regs);
721da177e4SLinus Torvalds return;
731da177e4SLinus Torvalds case 2:
744fa1970aSAl Viro old_regs = set_irq_regs(regs);
754fa1970aSAl Viro alpha_mv.machine_check(vector, la_ptr);
764fa1970aSAl Viro set_irq_regs(old_regs);
771da177e4SLinus Torvalds return;
781da177e4SLinus Torvalds case 3:
797ca56053SAl Viro old_regs = set_irq_regs(regs);
807ca56053SAl Viro alpha_mv.device_interrupt(vector);
817ca56053SAl Viro set_irq_regs(old_regs);
821da177e4SLinus Torvalds return;
831da177e4SLinus Torvalds case 4:
841da177e4SLinus Torvalds perf_irq(la_ptr, regs);
851da177e4SLinus Torvalds return;
861da177e4SLinus Torvalds default:
871da177e4SLinus Torvalds printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n",
881da177e4SLinus Torvalds type, vector);
891da177e4SLinus Torvalds }
901da177e4SLinus Torvalds printk(KERN_CRIT "PC = %016lx PS=%04lx\n", regs->pc, regs->ps);
911da177e4SLinus Torvalds }
921da177e4SLinus Torvalds
931da177e4SLinus Torvalds void __init
common_init_isa_dma(void)941da177e4SLinus Torvalds common_init_isa_dma(void)
951da177e4SLinus Torvalds {
961da177e4SLinus Torvalds outb(0, DMA1_RESET_REG);
971da177e4SLinus Torvalds outb(0, DMA2_RESET_REG);
981da177e4SLinus Torvalds outb(0, DMA1_CLR_MASK_REG);
991da177e4SLinus Torvalds outb(0, DMA2_CLR_MASK_REG);
1001da177e4SLinus Torvalds }
1011da177e4SLinus Torvalds
1021da177e4SLinus Torvalds void __init
init_IRQ(void)1031da177e4SLinus Torvalds init_IRQ(void)
1041da177e4SLinus Torvalds {
1051da177e4SLinus Torvalds /* Just in case the platform init_irq() causes interrupts/mchecks
1061da177e4SLinus Torvalds (as is the case with RAWHIDE, at least). */
1071da177e4SLinus Torvalds wrent(entInt, 0);
1081da177e4SLinus Torvalds
1091da177e4SLinus Torvalds alpha_mv.init_irq();
1101da177e4SLinus Torvalds }
1111da177e4SLinus Torvalds
1121da177e4SLinus Torvalds /*
1131da177e4SLinus Torvalds * machine error checks
1141da177e4SLinus Torvalds */
1151da177e4SLinus Torvalds #define MCHK_K_TPERR 0x0080
1161da177e4SLinus Torvalds #define MCHK_K_TCPERR 0x0082
1171da177e4SLinus Torvalds #define MCHK_K_HERR 0x0084
1181da177e4SLinus Torvalds #define MCHK_K_ECC_C 0x0086
1191da177e4SLinus Torvalds #define MCHK_K_ECC_NC 0x0088
1201da177e4SLinus Torvalds #define MCHK_K_OS_BUGCHECK 0x008A
1211da177e4SLinus Torvalds #define MCHK_K_PAL_BUGCHECK 0x0090
1221da177e4SLinus Torvalds
1231da177e4SLinus Torvalds #ifndef CONFIG_SMP
1241da177e4SLinus Torvalds struct mcheck_info __mcheck_info;
1251da177e4SLinus Torvalds #endif
1261da177e4SLinus Torvalds
1271da177e4SLinus Torvalds void
process_mcheck_info(unsigned long vector,unsigned long la_ptr,const char * machine,int expected)1281da177e4SLinus Torvalds process_mcheck_info(unsigned long vector, unsigned long la_ptr,
1294fa1970aSAl Viro const char *machine, int expected)
1301da177e4SLinus Torvalds {
1311da177e4SLinus Torvalds struct el_common *mchk_header;
1321da177e4SLinus Torvalds const char *reason;
1331da177e4SLinus Torvalds
1341da177e4SLinus Torvalds /*
1351da177e4SLinus Torvalds * See if the machine check is due to a badaddr() and if so,
1361da177e4SLinus Torvalds * ignore it.
1371da177e4SLinus Torvalds */
1381da177e4SLinus Torvalds
1391da177e4SLinus Torvalds #ifdef CONFIG_VERBOSE_MCHECK
1401da177e4SLinus Torvalds if (alpha_verbose_mcheck > 1) {
1411da177e4SLinus Torvalds printk(KERN_CRIT "%s machine check %s\n", machine,
1421da177e4SLinus Torvalds expected ? "expected." : "NOT expected!!!");
1431da177e4SLinus Torvalds }
1441da177e4SLinus Torvalds #endif
1451da177e4SLinus Torvalds
1461da177e4SLinus Torvalds if (expected) {
1471da177e4SLinus Torvalds int cpu = smp_processor_id();
1481da177e4SLinus Torvalds mcheck_expected(cpu) = 0;
1491da177e4SLinus Torvalds mcheck_taken(cpu) = 1;
1501da177e4SLinus Torvalds return;
1511da177e4SLinus Torvalds }
1521da177e4SLinus Torvalds
1531da177e4SLinus Torvalds mchk_header = (struct el_common *)la_ptr;
1541da177e4SLinus Torvalds
1551da177e4SLinus Torvalds printk(KERN_CRIT "%s machine check: vector=0x%lx pc=0x%lx code=0x%x\n",
1564fa1970aSAl Viro machine, vector, get_irq_regs()->pc, mchk_header->code);
1571da177e4SLinus Torvalds
1581da177e4SLinus Torvalds switch (mchk_header->code) {
1591da177e4SLinus Torvalds /* Machine check reasons. Defined according to PALcode sources. */
1601da177e4SLinus Torvalds case 0x80: reason = "tag parity error"; break;
1611da177e4SLinus Torvalds case 0x82: reason = "tag control parity error"; break;
1621da177e4SLinus Torvalds case 0x84: reason = "generic hard error"; break;
1631da177e4SLinus Torvalds case 0x86: reason = "correctable ECC error"; break;
1641da177e4SLinus Torvalds case 0x88: reason = "uncorrectable ECC error"; break;
1651da177e4SLinus Torvalds case 0x8A: reason = "OS-specific PAL bugcheck"; break;
1661da177e4SLinus Torvalds case 0x90: reason = "callsys in kernel mode"; break;
1671da177e4SLinus Torvalds case 0x96: reason = "i-cache read retryable error"; break;
1681da177e4SLinus Torvalds case 0x98: reason = "processor detected hard error"; break;
1691da177e4SLinus Torvalds
1701da177e4SLinus Torvalds /* System specific (these are for Alcor, at least): */
1711da177e4SLinus Torvalds case 0x202: reason = "system detected hard error"; break;
1721da177e4SLinus Torvalds case 0x203: reason = "system detected uncorrectable ECC error"; break;
1731da177e4SLinus Torvalds case 0x204: reason = "SIO SERR occurred on PCI bus"; break;
1741da177e4SLinus Torvalds case 0x205: reason = "parity error detected by core logic"; break;
1751da177e4SLinus Torvalds case 0x206: reason = "SIO IOCHK occurred on ISA bus"; break;
1761da177e4SLinus Torvalds case 0x207: reason = "non-existent memory error"; break;
1771da177e4SLinus Torvalds case 0x208: reason = "MCHK_K_DCSR"; break;
1781da177e4SLinus Torvalds case 0x209: reason = "PCI SERR detected"; break;
1791da177e4SLinus Torvalds case 0x20b: reason = "PCI data parity error detected"; break;
1801da177e4SLinus Torvalds case 0x20d: reason = "PCI address parity error detected"; break;
1811da177e4SLinus Torvalds case 0x20f: reason = "PCI master abort error"; break;
1821da177e4SLinus Torvalds case 0x211: reason = "PCI target abort error"; break;
1831da177e4SLinus Torvalds case 0x213: reason = "scatter/gather PTE invalid error"; break;
1841da177e4SLinus Torvalds case 0x215: reason = "flash ROM write error"; break;
1851da177e4SLinus Torvalds case 0x217: reason = "IOA timeout detected"; break;
1861da177e4SLinus Torvalds case 0x219: reason = "IOCHK#, EISA add-in board parity or other catastrophic error"; break;
1871da177e4SLinus Torvalds case 0x21b: reason = "EISA fail-safe timer timeout"; break;
1881da177e4SLinus Torvalds case 0x21d: reason = "EISA bus time-out"; break;
1891da177e4SLinus Torvalds case 0x21f: reason = "EISA software generated NMI"; break;
1901da177e4SLinus Torvalds case 0x221: reason = "unexpected ev5 IRQ[3] interrupt"; break;
1911da177e4SLinus Torvalds default: reason = "unknown"; break;
1921da177e4SLinus Torvalds }
1931da177e4SLinus Torvalds
1941da177e4SLinus Torvalds printk(KERN_CRIT "machine check type: %s%s\n",
1951da177e4SLinus Torvalds reason, mchk_header->retry ? " (retryable)" : "");
1961da177e4SLinus Torvalds
1974fa1970aSAl Viro dik_show_regs(get_irq_regs(), NULL);
1981da177e4SLinus Torvalds
1991da177e4SLinus Torvalds #ifdef CONFIG_VERBOSE_MCHECK
2001da177e4SLinus Torvalds if (alpha_verbose_mcheck > 1) {
2011da177e4SLinus Torvalds /* Dump the logout area to give all info. */
2021da177e4SLinus Torvalds unsigned long *ptr = (unsigned long *)la_ptr;
2031da177e4SLinus Torvalds long i;
2041da177e4SLinus Torvalds for (i = 0; i < mchk_header->size / sizeof(long); i += 2) {
2051da177e4SLinus Torvalds printk(KERN_CRIT " +%8lx %016lx %016lx\n",
2061da177e4SLinus Torvalds i*sizeof(long), ptr[i], ptr[i+1]);
2071da177e4SLinus Torvalds }
2081da177e4SLinus Torvalds }
2091da177e4SLinus Torvalds #endif /* CONFIG_VERBOSE_MCHECK */
2101da177e4SLinus Torvalds }
2111da177e4SLinus Torvalds
2121da177e4SLinus Torvalds /*
2131da177e4SLinus Torvalds * The special RTC interrupt type. The interrupt itself was
2141da177e4SLinus Torvalds * processed by PALcode, and comes in via entInt vector 1.
2151da177e4SLinus Torvalds */
2161da177e4SLinus Torvalds void __init
init_rtc_irq(irq_handler_t handler)217*82c849ebSafzal mohammed init_rtc_irq(irq_handler_t handler)
2181da177e4SLinus Torvalds {
21961813188SRichard Henderson irq_set_chip_and_handler_name(RTC_IRQ, &dummy_irq_chip,
220dff64649SRichard Henderson handle_percpu_irq, "RTC");
221*82c849ebSafzal mohammed if (!handler)
222*82c849ebSafzal mohammed handler = rtc_timer_interrupt;
223*82c849ebSafzal mohammed if (request_irq(RTC_IRQ, handler, 0, "timer", NULL))
224*82c849ebSafzal mohammed pr_err("Failed to register timer interrupt\n");
2251da177e4SLinus Torvalds }
226