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
22int __min_ipl;
23EXPORT_SYMBOL(__min_ipl);
24#endif
25
26/*
27 * Performance counter hook. A module can override this to
28 * do something useful.
29 */
30static void
31dummy_perf(unsigned long vector, struct pt_regs *regs)
32{
33 irq_err_count++;
34 printk(KERN_CRIT "Performance counter interrupt!\n");
35}
36
37void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf;
38EXPORT_SYMBOL(perf_irq);
39
40/*
41 * The main interrupt entry point.
42 */
43
44asmlinkage void
45do_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
93void __init
94common_init_isa_dma(void)
95{
96 outb(value: 0, DMA1_RESET_REG);
97 outb(value: 0, DMA2_RESET_REG);
98 outb(value: 0, DMA1_CLR_MASK_REG);
99 outb(value: 0, DMA2_CLR_MASK_REG);
100}
101
102void __init
103init_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
124struct mcheck_info __mcheck_info;
125#endif
126
127void
128process_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(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 */
216void __init
217init_rtc_irq(irq_handler_t handler)
218{
219 irq_set_chip_and_handler_name(RTC_IRQ, chip: &dummy_irq_chip,
220 handle: handle_percpu_irq, name: "RTC");
221 if (!handler)
222 handler = rtc_timer_interrupt;
223 if (request_irq(RTC_IRQ, handler, flags: 0, name: "timer", NULL))
224 pr_err("Failed to register timer interrupt\n");
225}
226

source code of linux/arch/alpha/kernel/irq_alpha.c