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-rw-r--r--arch/alpha/kernel/irq_alpha.c252
1 files changed, 252 insertions, 0 deletions
diff --git a/arch/alpha/kernel/irq_alpha.c b/arch/alpha/kernel/irq_alpha.c
new file mode 100644
index 000000000000..e6ded33c6e22
--- /dev/null
+++ b/arch/alpha/kernel/irq_alpha.c
@@ -0,0 +1,252 @@
1/*
2 * Alpha specific irq code.
3 */
4
5#include <linux/config.h>
6#include <linux/init.h>
7#include <linux/sched.h>
8#include <linux/irq.h>
9#include <linux/kernel_stat.h>
10
11#include <asm/machvec.h>
12#include <asm/dma.h>
13
14#include "proto.h"
15#include "irq_impl.h"
16
17/* Hack minimum IPL during interrupt processing for broken hardware. */
18#ifdef CONFIG_ALPHA_BROKEN_IRQ_MASK
19int __min_ipl;
20#endif
21
22/*
23 * Performance counter hook. A module can override this to
24 * do something useful.
25 */
26static void
27dummy_perf(unsigned long vector, struct pt_regs *regs)
28{
29 irq_err_count++;
30 printk(KERN_CRIT "Performance counter interrupt!\n");
31}
32
33void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf;
34
35/*
36 * The main interrupt entry point.
37 */
38
39asmlinkage void
40do_entInt(unsigned long type, unsigned long vector,
41 unsigned long la_ptr, struct pt_regs *regs)
42{
43 switch (type) {
44 case 0:
45#ifdef CONFIG_SMP
46 handle_ipi(regs);
47 return;
48#else
49 irq_err_count++;
50 printk(KERN_CRIT "Interprocessor interrupt? "
51 "You must be kidding!\n");
52#endif
53 break;
54 case 1:
55#ifdef CONFIG_SMP
56 {
57 long cpu;
58 smp_percpu_timer_interrupt(regs);
59 cpu = smp_processor_id();
60 if (cpu != boot_cpuid) {
61 kstat_cpu(cpu).irqs[RTC_IRQ]++;
62 } else {
63 handle_irq(RTC_IRQ, regs);
64 }
65 }
66#else
67 handle_irq(RTC_IRQ, regs);
68#endif
69 return;
70 case 2:
71 alpha_mv.machine_check(vector, la_ptr, regs);
72 return;
73 case 3:
74 alpha_mv.device_interrupt(vector, regs);
75 return;
76 case 4:
77 perf_irq(la_ptr, regs);
78 return;
79 default:
80 printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n",
81 type, vector);
82 }
83 printk(KERN_CRIT "PC = %016lx PS=%04lx\n", regs->pc, regs->ps);
84}
85
86void __init
87common_init_isa_dma(void)
88{
89 outb(0, DMA1_RESET_REG);
90 outb(0, DMA2_RESET_REG);
91 outb(0, DMA1_CLR_MASK_REG);
92 outb(0, DMA2_CLR_MASK_REG);
93}
94
95void __init
96init_IRQ(void)
97{
98 /* Just in case the platform init_irq() causes interrupts/mchecks
99 (as is the case with RAWHIDE, at least). */
100 wrent(entInt, 0);
101
102 alpha_mv.init_irq();
103}
104
105/*
106 * machine error checks
107 */
108#define MCHK_K_TPERR 0x0080
109#define MCHK_K_TCPERR 0x0082
110#define MCHK_K_HERR 0x0084
111#define MCHK_K_ECC_C 0x0086
112#define MCHK_K_ECC_NC 0x0088
113#define MCHK_K_OS_BUGCHECK 0x008A
114#define MCHK_K_PAL_BUGCHECK 0x0090
115
116#ifndef CONFIG_SMP
117struct mcheck_info __mcheck_info;
118#endif
119
120void
121process_mcheck_info(unsigned long vector, unsigned long la_ptr,
122 struct pt_regs *regs, const char *machine,
123 int expected)
124{
125 struct el_common *mchk_header;
126 const char *reason;
127
128 /*
129 * See if the machine check is due to a badaddr() and if so,
130 * ignore it.
131 */
132
133#ifdef CONFIG_VERBOSE_MCHECK
134 if (alpha_verbose_mcheck > 1) {
135 printk(KERN_CRIT "%s machine check %s\n", machine,
136 expected ? "expected." : "NOT expected!!!");
137 }
138#endif
139
140 if (expected) {
141 int cpu = smp_processor_id();
142 mcheck_expected(cpu) = 0;
143 mcheck_taken(cpu) = 1;
144 return;
145 }
146
147 mchk_header = (struct el_common *)la_ptr;
148
149 printk(KERN_CRIT "%s machine check: vector=0x%lx pc=0x%lx code=0x%x\n",
150 machine, vector, regs->pc, mchk_header->code);
151
152 switch (mchk_header->code) {
153 /* Machine check reasons. Defined according to PALcode sources. */
154 case 0x80: reason = "tag parity error"; break;
155 case 0x82: reason = "tag control parity error"; break;
156 case 0x84: reason = "generic hard error"; break;
157 case 0x86: reason = "correctable ECC error"; break;
158 case 0x88: reason = "uncorrectable ECC error"; break;
159 case 0x8A: reason = "OS-specific PAL bugcheck"; break;
160 case 0x90: reason = "callsys in kernel mode"; break;
161 case 0x96: reason = "i-cache read retryable error"; break;
162 case 0x98: reason = "processor detected hard error"; break;
163
164 /* System specific (these are for Alcor, at least): */
165 case 0x202: reason = "system detected hard error"; break;
166 case 0x203: reason = "system detected uncorrectable ECC error"; break;
167 case 0x204: reason = "SIO SERR occurred on PCI bus"; break;
168 case 0x205: reason = "parity error detected by core logic"; break;
169 case 0x206: reason = "SIO IOCHK occurred on ISA bus"; break;
170 case 0x207: reason = "non-existent memory error"; break;
171 case 0x208: reason = "MCHK_K_DCSR"; break;
172 case 0x209: reason = "PCI SERR detected"; break;
173 case 0x20b: reason = "PCI data parity error detected"; break;
174 case 0x20d: reason = "PCI address parity error detected"; break;
175 case 0x20f: reason = "PCI master abort error"; break;
176 case 0x211: reason = "PCI target abort error"; break;
177 case 0x213: reason = "scatter/gather PTE invalid error"; break;
178 case 0x215: reason = "flash ROM write error"; break;
179 case 0x217: reason = "IOA timeout detected"; break;
180 case 0x219: reason = "IOCHK#, EISA add-in board parity or other catastrophic error"; break;
181 case 0x21b: reason = "EISA fail-safe timer timeout"; break;
182 case 0x21d: reason = "EISA bus time-out"; break;
183 case 0x21f: reason = "EISA software generated NMI"; break;
184 case 0x221: reason = "unexpected ev5 IRQ[3] interrupt"; break;
185 default: reason = "unknown"; break;
186 }
187
188 printk(KERN_CRIT "machine check type: %s%s\n",
189 reason, mchk_header->retry ? " (retryable)" : "");
190
191 dik_show_regs(regs, NULL);
192
193#ifdef CONFIG_VERBOSE_MCHECK
194 if (alpha_verbose_mcheck > 1) {
195 /* Dump the logout area to give all info. */
196 unsigned long *ptr = (unsigned long *)la_ptr;
197 long i;
198 for (i = 0; i < mchk_header->size / sizeof(long); i += 2) {
199 printk(KERN_CRIT " +%8lx %016lx %016lx\n",
200 i*sizeof(long), ptr[i], ptr[i+1]);
201 }
202 }
203#endif /* CONFIG_VERBOSE_MCHECK */
204}
205
206/*
207 * The special RTC interrupt type. The interrupt itself was
208 * processed by PALcode, and comes in via entInt vector 1.
209 */
210
211static void rtc_enable_disable(unsigned int irq) { }
212static unsigned int rtc_startup(unsigned int irq) { return 0; }
213
214struct irqaction timer_irqaction = {
215 .handler = timer_interrupt,
216 .flags = SA_INTERRUPT,
217 .name = "timer",
218};
219
220static struct hw_interrupt_type rtc_irq_type = {
221 .typename = "RTC",
222 .startup = rtc_startup,
223 .shutdown = rtc_enable_disable,
224 .enable = rtc_enable_disable,
225 .disable = rtc_enable_disable,
226 .ack = rtc_enable_disable,
227 .end = rtc_enable_disable,
228};
229
230void __init
231init_rtc_irq(void)
232{
233 irq_desc[RTC_IRQ].status = IRQ_DISABLED;
234 irq_desc[RTC_IRQ].handler = &rtc_irq_type;
235 setup_irq(RTC_IRQ, &timer_irqaction);
236}
237
238/* Dummy irqactions. */
239struct irqaction isa_cascade_irqaction = {
240 .handler = no_action,
241 .name = "isa-cascade"
242};
243
244struct irqaction timer_cascade_irqaction = {
245 .handler = no_action,
246 .name = "timer-cascade"
247};
248
249struct irqaction halt_switch_irqaction = {
250 .handler = no_action,
251 .name = "halt-switch"
252};
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