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Merge branch 'ttm-next-3.13' of git://people.freedesktop.org/~thomash/linux into...
[deliverable/linux.git] / arch / mips / mti-malta / malta-int.c
1 /*
2 * Carsten Langgaard, carstenl@mips.com
3 * Copyright (C) 2000, 2001, 2004 MIPS Technologies, Inc.
4 * Copyright (C) 2001 Ralf Baechle
5 *
6 * This program is free software; you can distribute it and/or modify it
7 * under the terms of the GNU General Public License (Version 2) as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
18 *
19 * Routines for generic manipulation of the interrupts found on the MIPS
20 * Malta board.
21 * The interrupt controller is located in the South Bridge a PIIX4 device
22 * with two internal 82C95 interrupt controllers.
23 */
24 #include <linux/init.h>
25 #include <linux/irq.h>
26 #include <linux/sched.h>
27 #include <linux/smp.h>
28 #include <linux/interrupt.h>
29 #include <linux/io.h>
30 #include <linux/kernel_stat.h>
31 #include <linux/kernel.h>
32 #include <linux/random.h>
33
34 #include <asm/traps.h>
35 #include <asm/i8259.h>
36 #include <asm/irq_cpu.h>
37 #include <asm/irq_regs.h>
38 #include <asm/mips-boards/malta.h>
39 #include <asm/mips-boards/maltaint.h>
40 #include <asm/mips-boards/piix4.h>
41 #include <asm/gt64120.h>
42 #include <asm/mips-boards/generic.h>
43 #include <asm/mips-boards/msc01_pci.h>
44 #include <asm/msc01_ic.h>
45 #include <asm/gic.h>
46 #include <asm/gcmpregs.h>
47 #include <asm/setup.h>
48
49 int gcmp_present = -1;
50 static unsigned long _msc01_biu_base;
51 static unsigned long _gcmp_base;
52 static unsigned int ipi_map[NR_CPUS];
53
54 static DEFINE_RAW_SPINLOCK(mips_irq_lock);
55
56 static inline int mips_pcibios_iack(void)
57 {
58 int irq;
59
60 /*
61 * Determine highest priority pending interrupt by performing
62 * a PCI Interrupt Acknowledge cycle.
63 */
64 switch (mips_revision_sconid) {
65 case MIPS_REVISION_SCON_SOCIT:
66 case MIPS_REVISION_SCON_ROCIT:
67 case MIPS_REVISION_SCON_SOCITSC:
68 case MIPS_REVISION_SCON_SOCITSCP:
69 MSC_READ(MSC01_PCI_IACK, irq);
70 irq &= 0xff;
71 break;
72 case MIPS_REVISION_SCON_GT64120:
73 irq = GT_READ(GT_PCI0_IACK_OFS);
74 irq &= 0xff;
75 break;
76 case MIPS_REVISION_SCON_BONITO:
77 /* The following will generate a PCI IACK cycle on the
78 * Bonito controller. It's a little bit kludgy, but it
79 * was the easiest way to implement it in hardware at
80 * the given time.
81 */
82 BONITO_PCIMAP_CFG = 0x20000;
83
84 /* Flush Bonito register block */
85 (void) BONITO_PCIMAP_CFG;
86 iob(); /* sync */
87
88 irq = __raw_readl((u32 *)_pcictrl_bonito_pcicfg);
89 iob(); /* sync */
90 irq &= 0xff;
91 BONITO_PCIMAP_CFG = 0;
92 break;
93 default:
94 printk(KERN_WARNING "Unknown system controller.\n");
95 return -1;
96 }
97 return irq;
98 }
99
100 static inline int get_int(void)
101 {
102 unsigned long flags;
103 int irq;
104 raw_spin_lock_irqsave(&mips_irq_lock, flags);
105
106 irq = mips_pcibios_iack();
107
108 /*
109 * The only way we can decide if an interrupt is spurious
110 * is by checking the 8259 registers. This needs a spinlock
111 * on an SMP system, so leave it up to the generic code...
112 */
113
114 raw_spin_unlock_irqrestore(&mips_irq_lock, flags);
115
116 return irq;
117 }
118
119 static void malta_hw0_irqdispatch(void)
120 {
121 int irq;
122
123 irq = get_int();
124 if (irq < 0) {
125 /* interrupt has already been cleared */
126 return;
127 }
128
129 do_IRQ(MALTA_INT_BASE + irq);
130 }
131
132 static void malta_ipi_irqdispatch(void)
133 {
134 int irq;
135
136 if (gic_compare_int())
137 do_IRQ(MIPS_GIC_IRQ_BASE);
138
139 irq = gic_get_int();
140 if (irq < 0)
141 return; /* interrupt has already been cleared */
142
143 do_IRQ(MIPS_GIC_IRQ_BASE + irq);
144 }
145
146 static void corehi_irqdispatch(void)
147 {
148 unsigned int intedge, intsteer, pcicmd, pcibadaddr;
149 unsigned int pcimstat, intisr, inten, intpol;
150 unsigned int intrcause, datalo, datahi;
151 struct pt_regs *regs = get_irq_regs();
152
153 printk(KERN_EMERG "CoreHI interrupt, shouldn't happen, we die here!\n");
154 printk(KERN_EMERG "epc : %08lx\nStatus: %08lx\n"
155 "Cause : %08lx\nbadVaddr : %08lx\n",
156 regs->cp0_epc, regs->cp0_status,
157 regs->cp0_cause, regs->cp0_badvaddr);
158
159 /* Read all the registers and then print them as there is a
160 problem with interspersed printk's upsetting the Bonito controller.
161 Do it for the others too.
162 */
163
164 switch (mips_revision_sconid) {
165 case MIPS_REVISION_SCON_SOCIT:
166 case MIPS_REVISION_SCON_ROCIT:
167 case MIPS_REVISION_SCON_SOCITSC:
168 case MIPS_REVISION_SCON_SOCITSCP:
169 ll_msc_irq();
170 break;
171 case MIPS_REVISION_SCON_GT64120:
172 intrcause = GT_READ(GT_INTRCAUSE_OFS);
173 datalo = GT_READ(GT_CPUERR_ADDRLO_OFS);
174 datahi = GT_READ(GT_CPUERR_ADDRHI_OFS);
175 printk(KERN_EMERG "GT_INTRCAUSE = %08x\n", intrcause);
176 printk(KERN_EMERG "GT_CPUERR_ADDR = %02x%08x\n",
177 datahi, datalo);
178 break;
179 case MIPS_REVISION_SCON_BONITO:
180 pcibadaddr = BONITO_PCIBADADDR;
181 pcimstat = BONITO_PCIMSTAT;
182 intisr = BONITO_INTISR;
183 inten = BONITO_INTEN;
184 intpol = BONITO_INTPOL;
185 intedge = BONITO_INTEDGE;
186 intsteer = BONITO_INTSTEER;
187 pcicmd = BONITO_PCICMD;
188 printk(KERN_EMERG "BONITO_INTISR = %08x\n", intisr);
189 printk(KERN_EMERG "BONITO_INTEN = %08x\n", inten);
190 printk(KERN_EMERG "BONITO_INTPOL = %08x\n", intpol);
191 printk(KERN_EMERG "BONITO_INTEDGE = %08x\n", intedge);
192 printk(KERN_EMERG "BONITO_INTSTEER = %08x\n", intsteer);
193 printk(KERN_EMERG "BONITO_PCICMD = %08x\n", pcicmd);
194 printk(KERN_EMERG "BONITO_PCIBADADDR = %08x\n", pcibadaddr);
195 printk(KERN_EMERG "BONITO_PCIMSTAT = %08x\n", pcimstat);
196 break;
197 }
198
199 die("CoreHi interrupt", regs);
200 }
201
202 static inline int clz(unsigned long x)
203 {
204 __asm__(
205 " .set push \n"
206 " .set mips32 \n"
207 " clz %0, %1 \n"
208 " .set pop \n"
209 : "=r" (x)
210 : "r" (x));
211
212 return x;
213 }
214
215 /*
216 * Version of ffs that only looks at bits 12..15.
217 */
218 static inline unsigned int irq_ffs(unsigned int pending)
219 {
220 #if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
221 return -clz(pending) + 31 - CAUSEB_IP;
222 #else
223 unsigned int a0 = 7;
224 unsigned int t0;
225
226 t0 = pending & 0xf000;
227 t0 = t0 < 1;
228 t0 = t0 << 2;
229 a0 = a0 - t0;
230 pending = pending << t0;
231
232 t0 = pending & 0xc000;
233 t0 = t0 < 1;
234 t0 = t0 << 1;
235 a0 = a0 - t0;
236 pending = pending << t0;
237
238 t0 = pending & 0x8000;
239 t0 = t0 < 1;
240 /* t0 = t0 << 2; */
241 a0 = a0 - t0;
242 /* pending = pending << t0; */
243
244 return a0;
245 #endif
246 }
247
248 /*
249 * IRQs on the Malta board look basically (barring software IRQs which we
250 * don't use at all and all external interrupt sources are combined together
251 * on hardware interrupt 0 (MIPS IRQ 2)) like:
252 *
253 * MIPS IRQ Source
254 * -------- ------
255 * 0 Software (ignored)
256 * 1 Software (ignored)
257 * 2 Combined hardware interrupt (hw0)
258 * 3 Hardware (ignored)
259 * 4 Hardware (ignored)
260 * 5 Hardware (ignored)
261 * 6 Hardware (ignored)
262 * 7 R4k timer (what we use)
263 *
264 * We handle the IRQ according to _our_ priority which is:
265 *
266 * Highest ---- R4k Timer
267 * Lowest ---- Combined hardware interrupt
268 *
269 * then we just return, if multiple IRQs are pending then we will just take
270 * another exception, big deal.
271 */
272
273 asmlinkage void plat_irq_dispatch(void)
274 {
275 unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
276 int irq;
277
278 if (unlikely(!pending)) {
279 spurious_interrupt();
280 return;
281 }
282
283 irq = irq_ffs(pending);
284
285 if (irq == MIPSCPU_INT_I8259A)
286 malta_hw0_irqdispatch();
287 else if (gic_present && ((1 << irq) & ipi_map[smp_processor_id()]))
288 malta_ipi_irqdispatch();
289 else
290 do_IRQ(MIPS_CPU_IRQ_BASE + irq);
291 }
292
293 #ifdef CONFIG_MIPS_MT_SMP
294
295
296 #define GIC_MIPS_CPU_IPI_RESCHED_IRQ 3
297 #define GIC_MIPS_CPU_IPI_CALL_IRQ 4
298
299 #define MIPS_CPU_IPI_RESCHED_IRQ 0 /* SW int 0 for resched */
300 #define C_RESCHED C_SW0
301 #define MIPS_CPU_IPI_CALL_IRQ 1 /* SW int 1 for resched */
302 #define C_CALL C_SW1
303 static int cpu_ipi_resched_irq, cpu_ipi_call_irq;
304
305 static void ipi_resched_dispatch(void)
306 {
307 do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ);
308 }
309
310 static void ipi_call_dispatch(void)
311 {
312 do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ);
313 }
314
315 static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
316 {
317 scheduler_ipi();
318
319 return IRQ_HANDLED;
320 }
321
322 static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
323 {
324 smp_call_function_interrupt();
325
326 return IRQ_HANDLED;
327 }
328
329 static struct irqaction irq_resched = {
330 .handler = ipi_resched_interrupt,
331 .flags = IRQF_PERCPU,
332 .name = "IPI_resched"
333 };
334
335 static struct irqaction irq_call = {
336 .handler = ipi_call_interrupt,
337 .flags = IRQF_PERCPU,
338 .name = "IPI_call"
339 };
340 #endif /* CONFIG_MIPS_MT_SMP */
341
342 static int gic_resched_int_base;
343 static int gic_call_int_base;
344 #define GIC_RESCHED_INT(cpu) (gic_resched_int_base+(cpu))
345 #define GIC_CALL_INT(cpu) (gic_call_int_base+(cpu))
346
347 unsigned int plat_ipi_call_int_xlate(unsigned int cpu)
348 {
349 return GIC_CALL_INT(cpu);
350 }
351
352 unsigned int plat_ipi_resched_int_xlate(unsigned int cpu)
353 {
354 return GIC_RESCHED_INT(cpu);
355 }
356
357 static struct irqaction i8259irq = {
358 .handler = no_action,
359 .name = "XT-PIC cascade",
360 .flags = IRQF_NO_THREAD,
361 };
362
363 static struct irqaction corehi_irqaction = {
364 .handler = no_action,
365 .name = "CoreHi",
366 .flags = IRQF_NO_THREAD,
367 };
368
369 static msc_irqmap_t __initdata msc_irqmap[] = {
370 {MSC01C_INT_TMR, MSC01_IRQ_EDGE, 0},
371 {MSC01C_INT_PCI, MSC01_IRQ_LEVEL, 0},
372 };
373 static int __initdata msc_nr_irqs = ARRAY_SIZE(msc_irqmap);
374
375 static msc_irqmap_t __initdata msc_eicirqmap[] = {
376 {MSC01E_INT_SW0, MSC01_IRQ_LEVEL, 0},
377 {MSC01E_INT_SW1, MSC01_IRQ_LEVEL, 0},
378 {MSC01E_INT_I8259A, MSC01_IRQ_LEVEL, 0},
379 {MSC01E_INT_SMI, MSC01_IRQ_LEVEL, 0},
380 {MSC01E_INT_COREHI, MSC01_IRQ_LEVEL, 0},
381 {MSC01E_INT_CORELO, MSC01_IRQ_LEVEL, 0},
382 {MSC01E_INT_TMR, MSC01_IRQ_EDGE, 0},
383 {MSC01E_INT_PCI, MSC01_IRQ_LEVEL, 0},
384 {MSC01E_INT_PERFCTR, MSC01_IRQ_LEVEL, 0},
385 {MSC01E_INT_CPUCTR, MSC01_IRQ_LEVEL, 0}
386 };
387
388 static int __initdata msc_nr_eicirqs = ARRAY_SIZE(msc_eicirqmap);
389
390 /*
391 * This GIC specific tabular array defines the association between External
392 * Interrupts and CPUs/Core Interrupts. The nature of the External
393 * Interrupts is also defined here - polarity/trigger.
394 */
395
396 #define GIC_CPU_NMI GIC_MAP_TO_NMI_MSK
397 #define X GIC_UNUSED
398
399 static struct gic_intr_map gic_intr_map[GIC_NUM_INTRS] = {
400 { X, X, X, X, 0 },
401 { X, X, X, X, 0 },
402 { X, X, X, X, 0 },
403 { 0, GIC_CPU_INT0, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
404 { 0, GIC_CPU_INT1, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
405 { 0, GIC_CPU_INT2, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
406 { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
407 { 0, GIC_CPU_INT4, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
408 { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
409 { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
410 { X, X, X, X, 0 },
411 { X, X, X, X, 0 },
412 { 0, GIC_CPU_INT3, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
413 { 0, GIC_CPU_NMI, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
414 { 0, GIC_CPU_NMI, GIC_POL_POS, GIC_TRIG_LEVEL, GIC_FLAG_TRANSPARENT },
415 { X, X, X, X, 0 },
416 /* The remainder of this table is initialised by fill_ipi_map */
417 };
418 #undef X
419
420 /*
421 * GCMP needs to be detected before any SMP initialisation
422 */
423 int __init gcmp_probe(unsigned long addr, unsigned long size)
424 {
425 if ((mips_revision_sconid != MIPS_REVISION_SCON_ROCIT) &&
426 (mips_revision_sconid != MIPS_REVISION_SCON_GT64120)) {
427 gcmp_present = 0;
428 pr_debug("GCMP NOT present\n");
429 return gcmp_present;
430 }
431
432 if (gcmp_present >= 0)
433 return gcmp_present;
434
435 _gcmp_base = (unsigned long) ioremap_nocache(GCMP_BASE_ADDR, GCMP_ADDRSPACE_SZ);
436 _msc01_biu_base = (unsigned long) ioremap_nocache(MSC01_BIU_REG_BASE, MSC01_BIU_ADDRSPACE_SZ);
437 gcmp_present = (GCMPGCB(GCMPB) & GCMP_GCB_GCMPB_GCMPBASE_MSK) == GCMP_BASE_ADDR;
438
439 if (gcmp_present)
440 pr_debug("GCMP present\n");
441 return gcmp_present;
442 }
443
444 /* Return the number of IOCU's present */
445 int __init gcmp_niocu(void)
446 {
447 return gcmp_present ?
448 (GCMPGCB(GC) & GCMP_GCB_GC_NUMIOCU_MSK) >> GCMP_GCB_GC_NUMIOCU_SHF :
449 0;
450 }
451
452 /* Set GCMP region attributes */
453 void __init gcmp_setregion(int region, unsigned long base,
454 unsigned long mask, int type)
455 {
456 GCMPGCBn(CMxBASE, region) = base;
457 GCMPGCBn(CMxMASK, region) = mask | type;
458 }
459
460 #if defined(CONFIG_MIPS_MT_SMP)
461 static void __init fill_ipi_map1(int baseintr, int cpu, int cpupin)
462 {
463 int intr = baseintr + cpu;
464 gic_intr_map[intr].cpunum = cpu;
465 gic_intr_map[intr].pin = cpupin;
466 gic_intr_map[intr].polarity = GIC_POL_POS;
467 gic_intr_map[intr].trigtype = GIC_TRIG_EDGE;
468 gic_intr_map[intr].flags = GIC_FLAG_IPI;
469 ipi_map[cpu] |= (1 << (cpupin + 2));
470 }
471
472 static void __init fill_ipi_map(void)
473 {
474 int cpu;
475
476 for (cpu = 0; cpu < nr_cpu_ids; cpu++) {
477 fill_ipi_map1(gic_resched_int_base, cpu, GIC_CPU_INT1);
478 fill_ipi_map1(gic_call_int_base, cpu, GIC_CPU_INT2);
479 }
480 }
481 #endif
482
483 void __init arch_init_ipiirq(int irq, struct irqaction *action)
484 {
485 setup_irq(irq, action);
486 irq_set_handler(irq, handle_percpu_irq);
487 }
488
489 void __init arch_init_irq(void)
490 {
491 init_i8259_irqs();
492
493 if (!cpu_has_veic)
494 mips_cpu_irq_init();
495
496 if (gcmp_present) {
497 GCMPGCB(GICBA) = GIC_BASE_ADDR | GCMP_GCB_GICBA_EN_MSK;
498 gic_present = 1;
499 } else {
500 if (mips_revision_sconid == MIPS_REVISION_SCON_ROCIT) {
501 _msc01_biu_base = (unsigned long)
502 ioremap_nocache(MSC01_BIU_REG_BASE,
503 MSC01_BIU_ADDRSPACE_SZ);
504 gic_present = (REG(_msc01_biu_base, MSC01_SC_CFG) &
505 MSC01_SC_CFG_GICPRES_MSK) >>
506 MSC01_SC_CFG_GICPRES_SHF;
507 }
508 }
509 if (gic_present)
510 pr_debug("GIC present\n");
511
512 switch (mips_revision_sconid) {
513 case MIPS_REVISION_SCON_SOCIT:
514 case MIPS_REVISION_SCON_ROCIT:
515 if (cpu_has_veic)
516 init_msc_irqs(MIPS_MSC01_IC_REG_BASE,
517 MSC01E_INT_BASE, msc_eicirqmap,
518 msc_nr_eicirqs);
519 else
520 init_msc_irqs(MIPS_MSC01_IC_REG_BASE,
521 MSC01C_INT_BASE, msc_irqmap,
522 msc_nr_irqs);
523 break;
524
525 case MIPS_REVISION_SCON_SOCITSC:
526 case MIPS_REVISION_SCON_SOCITSCP:
527 if (cpu_has_veic)
528 init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE,
529 MSC01E_INT_BASE, msc_eicirqmap,
530 msc_nr_eicirqs);
531 else
532 init_msc_irqs(MIPS_SOCITSC_IC_REG_BASE,
533 MSC01C_INT_BASE, msc_irqmap,
534 msc_nr_irqs);
535 }
536
537 if (cpu_has_veic) {
538 set_vi_handler(MSC01E_INT_I8259A, malta_hw0_irqdispatch);
539 set_vi_handler(MSC01E_INT_COREHI, corehi_irqdispatch);
540 setup_irq(MSC01E_INT_BASE+MSC01E_INT_I8259A, &i8259irq);
541 setup_irq(MSC01E_INT_BASE+MSC01E_INT_COREHI, &corehi_irqaction);
542 } else if (cpu_has_vint) {
543 set_vi_handler(MIPSCPU_INT_I8259A, malta_hw0_irqdispatch);
544 set_vi_handler(MIPSCPU_INT_COREHI, corehi_irqdispatch);
545 #ifdef CONFIG_MIPS_MT_SMTC
546 setup_irq_smtc(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq,
547 (0x100 << MIPSCPU_INT_I8259A));
548 setup_irq_smtc(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
549 &corehi_irqaction, (0x100 << MIPSCPU_INT_COREHI));
550 /*
551 * Temporary hack to ensure that the subsidiary device
552 * interrupts coing in via the i8259A, but associated
553 * with low IRQ numbers, will restore the Status.IM
554 * value associated with the i8259A.
555 */
556 {
557 int i;
558
559 for (i = 0; i < 16; i++)
560 irq_hwmask[i] = (0x100 << MIPSCPU_INT_I8259A);
561 }
562 #else /* Not SMTC */
563 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq);
564 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
565 &corehi_irqaction);
566 #endif /* CONFIG_MIPS_MT_SMTC */
567 } else {
568 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_I8259A, &i8259irq);
569 setup_irq(MIPS_CPU_IRQ_BASE+MIPSCPU_INT_COREHI,
570 &corehi_irqaction);
571 }
572
573 if (gic_present) {
574 /* FIXME */
575 int i;
576 #if defined(CONFIG_MIPS_MT_SMP)
577 gic_call_int_base = GIC_NUM_INTRS -
578 (NR_CPUS - nr_cpu_ids) * 2 - nr_cpu_ids;
579 gic_resched_int_base = gic_call_int_base - nr_cpu_ids;
580 fill_ipi_map();
581 #endif
582 gic_init(GIC_BASE_ADDR, GIC_ADDRSPACE_SZ, gic_intr_map,
583 ARRAY_SIZE(gic_intr_map), MIPS_GIC_IRQ_BASE);
584 if (!gcmp_present) {
585 /* Enable the GIC */
586 i = REG(_msc01_biu_base, MSC01_SC_CFG);
587 REG(_msc01_biu_base, MSC01_SC_CFG) =
588 (i | (0x1 << MSC01_SC_CFG_GICENA_SHF));
589 pr_debug("GIC Enabled\n");
590 }
591 #if defined(CONFIG_MIPS_MT_SMP)
592 /* set up ipi interrupts */
593 if (cpu_has_vint) {
594 set_vi_handler(MIPSCPU_INT_IPI0, malta_ipi_irqdispatch);
595 set_vi_handler(MIPSCPU_INT_IPI1, malta_ipi_irqdispatch);
596 }
597 /* Argh.. this really needs sorting out.. */
598 printk("CPU%d: status register was %08x\n", smp_processor_id(), read_c0_status());
599 write_c0_status(read_c0_status() | STATUSF_IP3 | STATUSF_IP4);
600 printk("CPU%d: status register now %08x\n", smp_processor_id(), read_c0_status());
601 write_c0_status(0x1100dc00);
602 printk("CPU%d: status register frc %08x\n", smp_processor_id(), read_c0_status());
603 for (i = 0; i < nr_cpu_ids; i++) {
604 arch_init_ipiirq(MIPS_GIC_IRQ_BASE +
605 GIC_RESCHED_INT(i), &irq_resched);
606 arch_init_ipiirq(MIPS_GIC_IRQ_BASE +
607 GIC_CALL_INT(i), &irq_call);
608 }
609 #endif
610 } else {
611 #if defined(CONFIG_MIPS_MT_SMP)
612 /* set up ipi interrupts */
613 if (cpu_has_veic) {
614 set_vi_handler (MSC01E_INT_SW0, ipi_resched_dispatch);
615 set_vi_handler (MSC01E_INT_SW1, ipi_call_dispatch);
616 cpu_ipi_resched_irq = MSC01E_INT_SW0;
617 cpu_ipi_call_irq = MSC01E_INT_SW1;
618 } else {
619 if (cpu_has_vint) {
620 set_vi_handler (MIPS_CPU_IPI_RESCHED_IRQ, ipi_resched_dispatch);
621 set_vi_handler (MIPS_CPU_IPI_CALL_IRQ, ipi_call_dispatch);
622 }
623 cpu_ipi_resched_irq = MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ;
624 cpu_ipi_call_irq = MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ;
625 }
626 arch_init_ipiirq(cpu_ipi_resched_irq, &irq_resched);
627 arch_init_ipiirq(cpu_ipi_call_irq, &irq_call);
628 #endif
629 }
630 }
631
632 void malta_be_init(void)
633 {
634 if (gcmp_present) {
635 /* Could change CM error mask register */
636 }
637 }
638
639
640 static char *tr[8] = {
641 "mem", "gcr", "gic", "mmio",
642 "0x04", "0x05", "0x06", "0x07"
643 };
644
645 static char *mcmd[32] = {
646 [0x00] = "0x00",
647 [0x01] = "Legacy Write",
648 [0x02] = "Legacy Read",
649 [0x03] = "0x03",
650 [0x04] = "0x04",
651 [0x05] = "0x05",
652 [0x06] = "0x06",
653 [0x07] = "0x07",
654 [0x08] = "Coherent Read Own",
655 [0x09] = "Coherent Read Share",
656 [0x0a] = "Coherent Read Discard",
657 [0x0b] = "Coherent Ready Share Always",
658 [0x0c] = "Coherent Upgrade",
659 [0x0d] = "Coherent Writeback",
660 [0x0e] = "0x0e",
661 [0x0f] = "0x0f",
662 [0x10] = "Coherent Copyback",
663 [0x11] = "Coherent Copyback Invalidate",
664 [0x12] = "Coherent Invalidate",
665 [0x13] = "Coherent Write Invalidate",
666 [0x14] = "Coherent Completion Sync",
667 [0x15] = "0x15",
668 [0x16] = "0x16",
669 [0x17] = "0x17",
670 [0x18] = "0x18",
671 [0x19] = "0x19",
672 [0x1a] = "0x1a",
673 [0x1b] = "0x1b",
674 [0x1c] = "0x1c",
675 [0x1d] = "0x1d",
676 [0x1e] = "0x1e",
677 [0x1f] = "0x1f"
678 };
679
680 static char *core[8] = {
681 "Invalid/OK", "Invalid/Data",
682 "Shared/OK", "Shared/Data",
683 "Modified/OK", "Modified/Data",
684 "Exclusive/OK", "Exclusive/Data"
685 };
686
687 static char *causes[32] = {
688 "None", "GC_WR_ERR", "GC_RD_ERR", "COH_WR_ERR",
689 "COH_RD_ERR", "MMIO_WR_ERR", "MMIO_RD_ERR", "0x07",
690 "0x08", "0x09", "0x0a", "0x0b",
691 "0x0c", "0x0d", "0x0e", "0x0f",
692 "0x10", "0x11", "0x12", "0x13",
693 "0x14", "0x15", "0x16", "INTVN_WR_ERR",
694 "INTVN_RD_ERR", "0x19", "0x1a", "0x1b",
695 "0x1c", "0x1d", "0x1e", "0x1f"
696 };
697
698 int malta_be_handler(struct pt_regs *regs, int is_fixup)
699 {
700 /* This duplicates the handling in do_be which seems wrong */
701 int retval = is_fixup ? MIPS_BE_FIXUP : MIPS_BE_FATAL;
702
703 if (gcmp_present) {
704 unsigned long cm_error = GCMPGCB(GCMEC);
705 unsigned long cm_addr = GCMPGCB(GCMEA);
706 unsigned long cm_other = GCMPGCB(GCMEO);
707 unsigned long cause, ocause;
708 char buf[256];
709
710 cause = (cm_error & GCMP_GCB_GMEC_ERROR_TYPE_MSK);
711 if (cause != 0) {
712 cause >>= GCMP_GCB_GMEC_ERROR_TYPE_SHF;
713 if (cause < 16) {
714 unsigned long cca_bits = (cm_error >> 15) & 7;
715 unsigned long tr_bits = (cm_error >> 12) & 7;
716 unsigned long mcmd_bits = (cm_error >> 7) & 0x1f;
717 unsigned long stag_bits = (cm_error >> 3) & 15;
718 unsigned long sport_bits = (cm_error >> 0) & 7;
719
720 snprintf(buf, sizeof(buf),
721 "CCA=%lu TR=%s MCmd=%s STag=%lu "
722 "SPort=%lu\n",
723 cca_bits, tr[tr_bits], mcmd[mcmd_bits],
724 stag_bits, sport_bits);
725 } else {
726 /* glob state & sresp together */
727 unsigned long c3_bits = (cm_error >> 18) & 7;
728 unsigned long c2_bits = (cm_error >> 15) & 7;
729 unsigned long c1_bits = (cm_error >> 12) & 7;
730 unsigned long c0_bits = (cm_error >> 9) & 7;
731 unsigned long sc_bit = (cm_error >> 8) & 1;
732 unsigned long mcmd_bits = (cm_error >> 3) & 0x1f;
733 unsigned long sport_bits = (cm_error >> 0) & 7;
734 snprintf(buf, sizeof(buf),
735 "C3=%s C2=%s C1=%s C0=%s SC=%s "
736 "MCmd=%s SPort=%lu\n",
737 core[c3_bits], core[c2_bits],
738 core[c1_bits], core[c0_bits],
739 sc_bit ? "True" : "False",
740 mcmd[mcmd_bits], sport_bits);
741 }
742
743 ocause = (cm_other & GCMP_GCB_GMEO_ERROR_2ND_MSK) >>
744 GCMP_GCB_GMEO_ERROR_2ND_SHF;
745
746 printk("CM_ERROR=%08lx %s <%s>\n", cm_error,
747 causes[cause], buf);
748 printk("CM_ADDR =%08lx\n", cm_addr);
749 printk("CM_OTHER=%08lx %s\n", cm_other, causes[ocause]);
750
751 /* reprime cause register */
752 GCMPGCB(GCMEC) = 0;
753 }
754 }
755
756 return retval;
757 }
758
759 void gic_enable_interrupt(int irq_vec)
760 {
761 GIC_SET_INTR_MASK(irq_vec);
762 }
763
764 void gic_disable_interrupt(int irq_vec)
765 {
766 GIC_CLR_INTR_MASK(irq_vec);
767 }
768
769 void gic_irq_ack(struct irq_data *d)
770 {
771 int irq = (d->irq - gic_irq_base);
772
773 GIC_CLR_INTR_MASK(irq);
774
775 if (gic_irq_flags[irq] & GIC_TRIG_EDGE)
776 GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), irq);
777 }
778
779 void gic_finish_irq(struct irq_data *d)
780 {
781 /* Enable interrupts. */
782 GIC_SET_INTR_MASK(d->irq - gic_irq_base);
783 }
784
785 void __init gic_platform_init(int irqs, struct irq_chip *irq_controller)
786 {
787 int i;
788
789 for (i = gic_irq_base; i < (gic_irq_base + irqs); i++)
790 irq_set_chip(i, irq_controller);
791 }
Linux kernel - Deliverables
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