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Linux/arch/alpha/kernel/irq_alpha.c

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  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
 22 int __min_ipl;
 23 EXPORT_SYMBOL(__min_ipl);
 24 #endif
 25 
 26 /*
 27  * Performance counter hook.  A module can override this to
 28  * do something useful.
 29  */
 30 static void
 31 dummy_perf(unsigned long vector, struct pt_regs *regs)
 32 {
 33         irq_err_count++;
 34         printk(KERN_CRIT "Performance counter interrupt!\n");
 35 }
 36 
 37 void (*perf_irq)(unsigned long, struct pt_regs *) = dummy_perf;
 38 EXPORT_SYMBOL(perf_irq);
 39 
 40 /*
 41  * The main interrupt entry point.
 42  */
 43 
 44 asmlinkage void 
 45 do_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 
 93 void __init
 94 common_init_isa_dma(void)
 95 {
 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);
100 }
101 
102 void __init
103 init_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
124 struct mcheck_info __mcheck_info;
125 #endif
126 
127 void
128 process_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(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  */
216 
217 struct irqaction timer_irqaction = {
218         .handler        = rtc_timer_interrupt,
219         .name           = "timer",
220 };
221 
222 void __init
223 init_rtc_irq(void)
224 {
225         irq_set_chip_and_handler_name(RTC_IRQ, &dummy_irq_chip,
226                                       handle_percpu_irq, "RTC");
227         setup_irq(RTC_IRQ, &timer_irqaction);
228 }
229 
230 /* Dummy irqactions.  */
231 struct irqaction isa_cascade_irqaction = {
232         .handler        = no_action,
233         .name           = "isa-cascade"
234 };
235 
236 struct irqaction timer_cascade_irqaction = {
237         .handler        = no_action,
238         .name           = "timer-cascade"
239 };
240 
241 struct irqaction halt_switch_irqaction = {
242         .handler        = no_action,
243         .name           = "halt-switch"
244 };
245 

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