1 /*
2 * Alpha specific irq code.
3 */
4
5 #include <linux/init.h>
6 #include <linux/sched.h>
7 #include <linux/irq.h>
8 #include <linux/kernel_stat.h>
9 #include <linux/module.h>
10
11 #include <asm/machvec.h>
12 #include <asm/dma.h>
13 #include <asm/perf_event.h>
14 #include <asm/mce.h>
15
16 #include "proto.h"
17 #include "irq_impl.h"
18
19 /* Hack minimum IPL during interrupt processing for broken hardware. */
20 #ifdef CONFIG_ALPHA_BROKEN_IRQ_MASK
21 int __min_ipl;
22 EXPORT_SYMBOL(__min_ipl);
23 #endif
24
25 /*
26 * Performance counter hook. A module can override this to
27 * do something useful.
28 */
29 static void
dummy_perf(unsigned long vector,struct pt_regs * regs)30 dummy_perf(unsigned long vector, struct pt_regs *regs)
31 {
32 irq_err_count++;
33 printk(KERN_CRIT "Performance counter interrupt!\n");
34 }
35
36 void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf;
37 EXPORT_SYMBOL(perf_irq);
38
39 /*
40 * The main interrupt entry point.
41 */
42
43 asmlinkage void
do_entInt(unsigned long type,unsigned long vector,unsigned long la_ptr,struct pt_regs * regs)44 do_entInt(unsigned long type, unsigned long vector,
45 unsigned long la_ptr, struct pt_regs *regs)
46 {
47 struct pt_regs *old_regs;
48
49 /*
50 * Disable interrupts during IRQ handling.
51 * Note that there is no matching local_irq_enable() due to
52 * severe problems with RTI at IPL0 and some MILO PALcode
53 * (namely LX164).
54 */
55 local_irq_disable();
56 switch (type) {
57 case 0:
58 #ifdef CONFIG_SMP
59 handle_ipi(regs);
60 return;
61 #else
62 irq_err_count++;
63 printk(KERN_CRIT "Interprocessor interrupt? "
64 "You must be kidding!\n");
65 #endif
66 break;
67 case 1:
68 old_regs = set_irq_regs(regs);
69 handle_irq(RTC_IRQ);
70 set_irq_regs(old_regs);
71 return;
72 case 2:
73 old_regs = set_irq_regs(regs);
74 alpha_mv.machine_check(vector, la_ptr);
75 set_irq_regs(old_regs);
76 return;
77 case 3:
78 old_regs = set_irq_regs(regs);
79 alpha_mv.device_interrupt(vector);
80 set_irq_regs(old_regs);
81 return;
82 case 4:
83 perf_irq(la_ptr, regs);
84 return;
85 default:
86 printk(KERN_CRIT "Hardware intr %ld %lx? Huh?\n",
87 type, vector);
88 }
89 printk(KERN_CRIT "PC = %016lx PS=%04lx\n", regs->pc, regs->ps);
90 }
91
92 void __init
common_init_isa_dma(void)93 common_init_isa_dma(void)
94 {
95 outb(0, DMA1_RESET_REG);
96 outb(0, DMA2_RESET_REG);
97 outb(0, DMA1_CLR_MASK_REG);
98 outb(0, DMA2_CLR_MASK_REG);
99 }
100
101 void __init
init_IRQ(void)102 init_IRQ(void)
103 {
104 /* Just in case the platform init_irq() causes interrupts/mchecks
105 (as is the case with RAWHIDE, at least). */
106 wrent(entInt, 0);
107
108 alpha_mv.init_irq();
109 }
110
111 /*
112 * machine error checks
113 */
114 #define MCHK_K_TPERR 0x0080
115 #define MCHK_K_TCPERR 0x0082
116 #define MCHK_K_HERR 0x0084
117 #define MCHK_K_ECC_C 0x0086
118 #define MCHK_K_ECC_NC 0x0088
119 #define MCHK_K_OS_BUGCHECK 0x008A
120 #define MCHK_K_PAL_BUGCHECK 0x0090
121
122 #ifndef CONFIG_SMP
123 struct mcheck_info __mcheck_info;
124 #endif
125
126 void
process_mcheck_info(unsigned long vector,unsigned long la_ptr,const char * machine,int expected)127 process_mcheck_info(unsigned long vector, unsigned long la_ptr,
128 const char *machine, int expected)
129 {
130 struct el_common *mchk_header;
131 const char *reason;
132
133 /*
134 * See if the machine check is due to a badaddr() and if so,
135 * ignore it.
136 */
137
138 #ifdef CONFIG_VERBOSE_MCHECK
139 if (alpha_verbose_mcheck > 1) {
140 printk(KERN_CRIT "%s machine check %s\n", machine,
141 expected ? "expected." : "NOT expected!!!");
142 }
143 #endif
144
145 if (expected) {
146 int cpu = smp_processor_id();
147 mcheck_expected(cpu) = 0;
148 mcheck_taken(cpu) = 1;
149 return;
150 }
151
152 mchk_header = (struct el_common *)la_ptr;
153
154 printk(KERN_CRIT "%s machine check: vector=0x%lx pc=0x%lx code=0x%x\n",
155 machine, vector, get_irq_regs()->pc, mchk_header->code);
156
157 switch (mchk_header->code) {
158 /* Machine check reasons. Defined according to PALcode sources. */
159 case 0x80: reason = "tag parity error"; break;
160 case 0x82: reason = "tag control parity error"; break;
161 case 0x84: reason = "generic hard error"; break;
162 case 0x86: reason = "correctable ECC error"; break;
163 case 0x88: reason = "uncorrectable ECC error"; break;
164 case 0x8A: reason = "OS-specific PAL bugcheck"; break;
165 case 0x90: reason = "callsys in kernel mode"; break;
166 case 0x96: reason = "i-cache read retryable error"; break;
167 case 0x98: reason = "processor detected hard error"; break;
168
169 /* System specific (these are for Alcor, at least): */
170 case 0x202: reason = "system detected hard error"; break;
171 case 0x203: reason = "system detected uncorrectable ECC error"; break;
172 case 0x204: reason = "SIO SERR occurred on PCI bus"; break;
173 case 0x205: reason = "parity error detected by core logic"; break;
174 case 0x206: reason = "SIO IOCHK occurred on ISA bus"; break;
175 case 0x207: reason = "non-existent memory error"; break;
176 case 0x208: reason = "MCHK_K_DCSR"; break;
177 case 0x209: reason = "PCI SERR detected"; break;
178 case 0x20b: reason = "PCI data parity error detected"; break;
179 case 0x20d: reason = "PCI address parity error detected"; break;
180 case 0x20f: reason = "PCI master abort error"; break;
181 case 0x211: reason = "PCI target abort error"; break;
182 case 0x213: reason = "scatter/gather PTE invalid error"; break;
183 case 0x215: reason = "flash ROM write error"; break;
184 case 0x217: reason = "IOA timeout detected"; break;
185 case 0x219: reason = "IOCHK#, EISA add-in board parity or other catastrophic error"; break;
186 case 0x21b: reason = "EISA fail-safe timer timeout"; break;
187 case 0x21d: reason = "EISA bus time-out"; break;
188 case 0x21f: reason = "EISA software generated NMI"; break;
189 case 0x221: reason = "unexpected ev5 IRQ[3] interrupt"; break;
190 default: reason = "unknown"; break;
191 }
192
193 printk(KERN_CRIT "machine check type: %s%s\n",
194 reason, mchk_header->retry ? " (retryable)" : "");
195
196 dik_show_regs(get_irq_regs(), NULL);
197
198 #ifdef CONFIG_VERBOSE_MCHECK
199 if (alpha_verbose_mcheck > 1) {
200 /* Dump the logout area to give all info. */
201 unsigned long *ptr = (unsigned long *)la_ptr;
202 long i;
203 for (i = 0; i < mchk_header->size / sizeof(long); i += 2) {
204 printk(KERN_CRIT " +%8lx %016lx %016lx\n",
205 i*sizeof(long), ptr[i], ptr[i+1]);
206 }
207 }
208 #endif /* CONFIG_VERBOSE_MCHECK */
209 }
210
211 /*
212 * The special RTC interrupt type. The interrupt itself was
213 * processed by PALcode, and comes in via entInt vector 1.
214 */
215
216 struct irqaction timer_irqaction = {
217 .handler = rtc_timer_interrupt,
218 .name = "timer",
219 };
220
221 void __init
init_rtc_irq(void)222 init_rtc_irq(void)
223 {
224 irq_set_chip_and_handler_name(RTC_IRQ, &dummy_irq_chip,
225 handle_percpu_irq, "RTC");
226 setup_irq(RTC_IRQ, &timer_irqaction);
227 }
228
229 /* Dummy irqactions. */
230 struct irqaction isa_cascade_irqaction = {
231 .handler = no_action,
232 .name = "isa-cascade"
233 };
234
235 struct irqaction timer_cascade_irqaction = {
236 .handler = no_action,
237 .name = "timer-cascade"
238 };
239
240 struct irqaction halt_switch_irqaction = {
241 .handler = no_action,
242 .name = "halt-switch"
243 };
244