1 /* 2 * arch/powerpc/kernel/mpic.c 3 * 4 * Driver for interrupt controllers following the OpenPIC standard, the 5 * common implementation beeing IBM's MPIC. This driver also can deal 6 * with various broken implementations of this HW. 7 * 8 * Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp. 9 * 10 * This file is subject to the terms and conditions of the GNU General Public 11 * License. See the file COPYING in the main directory of this archive 12 * for more details. 13 */ 14 15 #undef DEBUG 16 #undef DEBUG_IPI 17 #undef DEBUG_IRQ 18 #undef DEBUG_LOW 19 20 #include <linux/types.h> 21 #include <linux/kernel.h> 22 #include <linux/init.h> 23 #include <linux/irq.h> 24 #include <linux/smp.h> 25 #include <linux/interrupt.h> 26 #include <linux/bootmem.h> 27 #include <linux/spinlock.h> 28 #include <linux/pci.h> 29 30 #include <asm/ptrace.h> 31 #include <asm/signal.h> 32 #include <asm/io.h> 33 #include <asm/pgtable.h> 34 #include <asm/irq.h> 35 #include <asm/machdep.h> 36 #include <asm/mpic.h> 37 #include <asm/smp.h> 38 39 #include "mpic.h" 40 41 #ifdef DEBUG 42 #define DBG(fmt...) printk(fmt) 43 #else 44 #define DBG(fmt...) 45 #endif 46 47 static struct mpic *mpics; 48 static struct mpic *mpic_primary; 49 static DEFINE_SPINLOCK(mpic_lock); 50 51 #ifdef CONFIG_PPC32 /* XXX for now */ 52 #ifdef CONFIG_IRQ_ALL_CPUS 53 #define distribute_irqs (1) 54 #else 55 #define distribute_irqs (0) 56 #endif 57 #endif 58 59 #ifdef CONFIG_MPIC_WEIRD 60 static u32 mpic_infos[][MPIC_IDX_END] = { 61 [0] = { /* Original OpenPIC compatible MPIC */ 62 MPIC_GREG_BASE, 63 MPIC_GREG_FEATURE_0, 64 MPIC_GREG_GLOBAL_CONF_0, 65 MPIC_GREG_VENDOR_ID, 66 MPIC_GREG_IPI_VECTOR_PRI_0, 67 MPIC_GREG_IPI_STRIDE, 68 MPIC_GREG_SPURIOUS, 69 MPIC_GREG_TIMER_FREQ, 70 71 MPIC_TIMER_BASE, 72 MPIC_TIMER_STRIDE, 73 MPIC_TIMER_CURRENT_CNT, 74 MPIC_TIMER_BASE_CNT, 75 MPIC_TIMER_VECTOR_PRI, 76 MPIC_TIMER_DESTINATION, 77 78 MPIC_CPU_BASE, 79 MPIC_CPU_STRIDE, 80 MPIC_CPU_IPI_DISPATCH_0, 81 MPIC_CPU_IPI_DISPATCH_STRIDE, 82 MPIC_CPU_CURRENT_TASK_PRI, 83 MPIC_CPU_WHOAMI, 84 MPIC_CPU_INTACK, 85 MPIC_CPU_EOI, 86 MPIC_CPU_MCACK, 87 88 MPIC_IRQ_BASE, 89 MPIC_IRQ_STRIDE, 90 MPIC_IRQ_VECTOR_PRI, 91 MPIC_VECPRI_VECTOR_MASK, 92 MPIC_VECPRI_POLARITY_POSITIVE, 93 MPIC_VECPRI_POLARITY_NEGATIVE, 94 MPIC_VECPRI_SENSE_LEVEL, 95 MPIC_VECPRI_SENSE_EDGE, 96 MPIC_VECPRI_POLARITY_MASK, 97 MPIC_VECPRI_SENSE_MASK, 98 MPIC_IRQ_DESTINATION 99 }, 100 [1] = { /* Tsi108/109 PIC */ 101 TSI108_GREG_BASE, 102 TSI108_GREG_FEATURE_0, 103 TSI108_GREG_GLOBAL_CONF_0, 104 TSI108_GREG_VENDOR_ID, 105 TSI108_GREG_IPI_VECTOR_PRI_0, 106 TSI108_GREG_IPI_STRIDE, 107 TSI108_GREG_SPURIOUS, 108 TSI108_GREG_TIMER_FREQ, 109 110 TSI108_TIMER_BASE, 111 TSI108_TIMER_STRIDE, 112 TSI108_TIMER_CURRENT_CNT, 113 TSI108_TIMER_BASE_CNT, 114 TSI108_TIMER_VECTOR_PRI, 115 TSI108_TIMER_DESTINATION, 116 117 TSI108_CPU_BASE, 118 TSI108_CPU_STRIDE, 119 TSI108_CPU_IPI_DISPATCH_0, 120 TSI108_CPU_IPI_DISPATCH_STRIDE, 121 TSI108_CPU_CURRENT_TASK_PRI, 122 TSI108_CPU_WHOAMI, 123 TSI108_CPU_INTACK, 124 TSI108_CPU_EOI, 125 TSI108_CPU_MCACK, 126 127 TSI108_IRQ_BASE, 128 TSI108_IRQ_STRIDE, 129 TSI108_IRQ_VECTOR_PRI, 130 TSI108_VECPRI_VECTOR_MASK, 131 TSI108_VECPRI_POLARITY_POSITIVE, 132 TSI108_VECPRI_POLARITY_NEGATIVE, 133 TSI108_VECPRI_SENSE_LEVEL, 134 TSI108_VECPRI_SENSE_EDGE, 135 TSI108_VECPRI_POLARITY_MASK, 136 TSI108_VECPRI_SENSE_MASK, 137 TSI108_IRQ_DESTINATION 138 }, 139 }; 140 141 #define MPIC_INFO(name) mpic->hw_set[MPIC_IDX_##name] 142 143 #else /* CONFIG_MPIC_WEIRD */ 144 145 #define MPIC_INFO(name) MPIC_##name 146 147 #endif /* CONFIG_MPIC_WEIRD */ 148 149 /* 150 * Register accessor functions 151 */ 152 153 154 static inline u32 _mpic_read(enum mpic_reg_type type, 155 struct mpic_reg_bank *rb, 156 unsigned int reg) 157 { 158 switch(type) { 159 #ifdef CONFIG_PPC_DCR 160 case mpic_access_dcr: 161 return dcr_read(rb->dhost, reg); 162 #endif 163 case mpic_access_mmio_be: 164 return in_be32(rb->base + (reg >> 2)); 165 case mpic_access_mmio_le: 166 default: 167 return in_le32(rb->base + (reg >> 2)); 168 } 169 } 170 171 static inline void _mpic_write(enum mpic_reg_type type, 172 struct mpic_reg_bank *rb, 173 unsigned int reg, u32 value) 174 { 175 switch(type) { 176 #ifdef CONFIG_PPC_DCR 177 case mpic_access_dcr: 178 dcr_write(rb->dhost, reg, value); 179 break; 180 #endif 181 case mpic_access_mmio_be: 182 out_be32(rb->base + (reg >> 2), value); 183 break; 184 case mpic_access_mmio_le: 185 default: 186 out_le32(rb->base + (reg >> 2), value); 187 break; 188 } 189 } 190 191 static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi) 192 { 193 enum mpic_reg_type type = mpic->reg_type; 194 unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) + 195 (ipi * MPIC_INFO(GREG_IPI_STRIDE)); 196 197 if ((mpic->flags & MPIC_BROKEN_IPI) && type == mpic_access_mmio_le) 198 type = mpic_access_mmio_be; 199 return _mpic_read(type, &mpic->gregs, offset); 200 } 201 202 static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value) 203 { 204 unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) + 205 (ipi * MPIC_INFO(GREG_IPI_STRIDE)); 206 207 _mpic_write(mpic->reg_type, &mpic->gregs, offset, value); 208 } 209 210 static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg) 211 { 212 unsigned int cpu = 0; 213 214 if (mpic->flags & MPIC_PRIMARY) 215 cpu = hard_smp_processor_id(); 216 return _mpic_read(mpic->reg_type, &mpic->cpuregs[cpu], reg); 217 } 218 219 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value) 220 { 221 unsigned int cpu = 0; 222 223 if (mpic->flags & MPIC_PRIMARY) 224 cpu = hard_smp_processor_id(); 225 226 _mpic_write(mpic->reg_type, &mpic->cpuregs[cpu], reg, value); 227 } 228 229 static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg) 230 { 231 unsigned int isu = src_no >> mpic->isu_shift; 232 unsigned int idx = src_no & mpic->isu_mask; 233 234 #ifdef CONFIG_MPIC_BROKEN_REGREAD 235 if (reg == 0) 236 return mpic->isu_reg0_shadow[idx]; 237 else 238 #endif 239 return _mpic_read(mpic->reg_type, &mpic->isus[isu], 240 reg + (idx * MPIC_INFO(IRQ_STRIDE))); 241 } 242 243 static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no, 244 unsigned int reg, u32 value) 245 { 246 unsigned int isu = src_no >> mpic->isu_shift; 247 unsigned int idx = src_no & mpic->isu_mask; 248 249 _mpic_write(mpic->reg_type, &mpic->isus[isu], 250 reg + (idx * MPIC_INFO(IRQ_STRIDE)), value); 251 252 #ifdef CONFIG_MPIC_BROKEN_REGREAD 253 if (reg == 0) 254 mpic->isu_reg0_shadow[idx] = value; 255 #endif 256 } 257 258 #define mpic_read(b,r) _mpic_read(mpic->reg_type,&(b),(r)) 259 #define mpic_write(b,r,v) _mpic_write(mpic->reg_type,&(b),(r),(v)) 260 #define mpic_ipi_read(i) _mpic_ipi_read(mpic,(i)) 261 #define mpic_ipi_write(i,v) _mpic_ipi_write(mpic,(i),(v)) 262 #define mpic_cpu_read(i) _mpic_cpu_read(mpic,(i)) 263 #define mpic_cpu_write(i,v) _mpic_cpu_write(mpic,(i),(v)) 264 #define mpic_irq_read(s,r) _mpic_irq_read(mpic,(s),(r)) 265 #define mpic_irq_write(s,r,v) _mpic_irq_write(mpic,(s),(r),(v)) 266 267 268 /* 269 * Low level utility functions 270 */ 271 272 273 static void _mpic_map_mmio(struct mpic *mpic, phys_addr_t phys_addr, 274 struct mpic_reg_bank *rb, unsigned int offset, 275 unsigned int size) 276 { 277 rb->base = ioremap(phys_addr + offset, size); 278 BUG_ON(rb->base == NULL); 279 } 280 281 #ifdef CONFIG_PPC_DCR 282 static void _mpic_map_dcr(struct mpic *mpic, struct mpic_reg_bank *rb, 283 unsigned int offset, unsigned int size) 284 { 285 const u32 *dbasep; 286 287 dbasep = of_get_property(mpic->irqhost->of_node, "dcr-reg", NULL); 288 289 rb->dhost = dcr_map(mpic->irqhost->of_node, *dbasep + offset, size); 290 BUG_ON(!DCR_MAP_OK(rb->dhost)); 291 } 292 293 static inline void mpic_map(struct mpic *mpic, phys_addr_t phys_addr, 294 struct mpic_reg_bank *rb, unsigned int offset, 295 unsigned int size) 296 { 297 if (mpic->flags & MPIC_USES_DCR) 298 _mpic_map_dcr(mpic, rb, offset, size); 299 else 300 _mpic_map_mmio(mpic, phys_addr, rb, offset, size); 301 } 302 #else /* CONFIG_PPC_DCR */ 303 #define mpic_map(m,p,b,o,s) _mpic_map_mmio(m,p,b,o,s) 304 #endif /* !CONFIG_PPC_DCR */ 305 306 307 308 /* Check if we have one of those nice broken MPICs with a flipped endian on 309 * reads from IPI registers 310 */ 311 static void __init mpic_test_broken_ipi(struct mpic *mpic) 312 { 313 u32 r; 314 315 mpic_write(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0), MPIC_VECPRI_MASK); 316 r = mpic_read(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0)); 317 318 if (r == le32_to_cpu(MPIC_VECPRI_MASK)) { 319 printk(KERN_INFO "mpic: Detected reversed IPI registers\n"); 320 mpic->flags |= MPIC_BROKEN_IPI; 321 } 322 } 323 324 #ifdef CONFIG_MPIC_U3_HT_IRQS 325 326 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s) 327 * to force the edge setting on the MPIC and do the ack workaround. 328 */ 329 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source) 330 { 331 if (source >= 128 || !mpic->fixups) 332 return 0; 333 return mpic->fixups[source].base != NULL; 334 } 335 336 337 static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source) 338 { 339 struct mpic_irq_fixup *fixup = &mpic->fixups[source]; 340 341 if (fixup->applebase) { 342 unsigned int soff = (fixup->index >> 3) & ~3; 343 unsigned int mask = 1U << (fixup->index & 0x1f); 344 writel(mask, fixup->applebase + soff); 345 } else { 346 spin_lock(&mpic->fixup_lock); 347 writeb(0x11 + 2 * fixup->index, fixup->base + 2); 348 writel(fixup->data, fixup->base + 4); 349 spin_unlock(&mpic->fixup_lock); 350 } 351 } 352 353 static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source, 354 unsigned int irqflags) 355 { 356 struct mpic_irq_fixup *fixup = &mpic->fixups[source]; 357 unsigned long flags; 358 u32 tmp; 359 360 if (fixup->base == NULL) 361 return; 362 363 DBG("startup_ht_interrupt(0x%x, 0x%x) index: %d\n", 364 source, irqflags, fixup->index); 365 spin_lock_irqsave(&mpic->fixup_lock, flags); 366 /* Enable and configure */ 367 writeb(0x10 + 2 * fixup->index, fixup->base + 2); 368 tmp = readl(fixup->base + 4); 369 tmp &= ~(0x23U); 370 if (irqflags & IRQ_LEVEL) 371 tmp |= 0x22; 372 writel(tmp, fixup->base + 4); 373 spin_unlock_irqrestore(&mpic->fixup_lock, flags); 374 375 #ifdef CONFIG_PM 376 /* use the lowest bit inverted to the actual HW, 377 * set if this fixup was enabled, clear otherwise */ 378 mpic->save_data[source].fixup_data = tmp | 1; 379 #endif 380 } 381 382 static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source, 383 unsigned int irqflags) 384 { 385 struct mpic_irq_fixup *fixup = &mpic->fixups[source]; 386 unsigned long flags; 387 u32 tmp; 388 389 if (fixup->base == NULL) 390 return; 391 392 DBG("shutdown_ht_interrupt(0x%x, 0x%x)\n", source, irqflags); 393 394 /* Disable */ 395 spin_lock_irqsave(&mpic->fixup_lock, flags); 396 writeb(0x10 + 2 * fixup->index, fixup->base + 2); 397 tmp = readl(fixup->base + 4); 398 tmp |= 1; 399 writel(tmp, fixup->base + 4); 400 spin_unlock_irqrestore(&mpic->fixup_lock, flags); 401 402 #ifdef CONFIG_PM 403 /* use the lowest bit inverted to the actual HW, 404 * set if this fixup was enabled, clear otherwise */ 405 mpic->save_data[source].fixup_data = tmp & ~1; 406 #endif 407 } 408 409 #ifdef CONFIG_PCI_MSI 410 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase, 411 unsigned int devfn) 412 { 413 u8 __iomem *base; 414 u8 pos, flags; 415 u64 addr = 0; 416 417 for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0; 418 pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) { 419 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID); 420 if (id == PCI_CAP_ID_HT) { 421 id = readb(devbase + pos + 3); 422 if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_MSI_MAPPING) 423 break; 424 } 425 } 426 427 if (pos == 0) 428 return; 429 430 base = devbase + pos; 431 432 flags = readb(base + HT_MSI_FLAGS); 433 if (!(flags & HT_MSI_FLAGS_FIXED)) { 434 addr = readl(base + HT_MSI_ADDR_LO) & HT_MSI_ADDR_LO_MASK; 435 addr = addr | ((u64)readl(base + HT_MSI_ADDR_HI) << 32); 436 } 437 438 printk(KERN_DEBUG "mpic: - HT:%02x.%x %s MSI mapping found @ 0x%lx\n", 439 PCI_SLOT(devfn), PCI_FUNC(devfn), 440 flags & HT_MSI_FLAGS_ENABLE ? "enabled" : "disabled", addr); 441 442 if (!(flags & HT_MSI_FLAGS_ENABLE)) 443 writeb(flags | HT_MSI_FLAGS_ENABLE, base + HT_MSI_FLAGS); 444 } 445 #else 446 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase, 447 unsigned int devfn) 448 { 449 return; 450 } 451 #endif 452 453 static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase, 454 unsigned int devfn, u32 vdid) 455 { 456 int i, irq, n; 457 u8 __iomem *base; 458 u32 tmp; 459 u8 pos; 460 461 for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0; 462 pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) { 463 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID); 464 if (id == PCI_CAP_ID_HT) { 465 id = readb(devbase + pos + 3); 466 if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_IRQ) 467 break; 468 } 469 } 470 if (pos == 0) 471 return; 472 473 base = devbase + pos; 474 writeb(0x01, base + 2); 475 n = (readl(base + 4) >> 16) & 0xff; 476 477 printk(KERN_INFO "mpic: - HT:%02x.%x [0x%02x] vendor %04x device %04x" 478 " has %d irqs\n", 479 devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1); 480 481 for (i = 0; i <= n; i++) { 482 writeb(0x10 + 2 * i, base + 2); 483 tmp = readl(base + 4); 484 irq = (tmp >> 16) & 0xff; 485 DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp); 486 /* mask it , will be unmasked later */ 487 tmp |= 0x1; 488 writel(tmp, base + 4); 489 mpic->fixups[irq].index = i; 490 mpic->fixups[irq].base = base; 491 /* Apple HT PIC has a non-standard way of doing EOIs */ 492 if ((vdid & 0xffff) == 0x106b) 493 mpic->fixups[irq].applebase = devbase + 0x60; 494 else 495 mpic->fixups[irq].applebase = NULL; 496 writeb(0x11 + 2 * i, base + 2); 497 mpic->fixups[irq].data = readl(base + 4) | 0x80000000; 498 } 499 } 500 501 502 static void __init mpic_scan_ht_pics(struct mpic *mpic) 503 { 504 unsigned int devfn; 505 u8 __iomem *cfgspace; 506 507 printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n"); 508 509 /* Allocate fixups array */ 510 mpic->fixups = alloc_bootmem(128 * sizeof(struct mpic_irq_fixup)); 511 BUG_ON(mpic->fixups == NULL); 512 memset(mpic->fixups, 0, 128 * sizeof(struct mpic_irq_fixup)); 513 514 /* Init spinlock */ 515 spin_lock_init(&mpic->fixup_lock); 516 517 /* Map U3 config space. We assume all IO-APICs are on the primary bus 518 * so we only need to map 64kB. 519 */ 520 cfgspace = ioremap(0xf2000000, 0x10000); 521 BUG_ON(cfgspace == NULL); 522 523 /* Now we scan all slots. We do a very quick scan, we read the header 524 * type, vendor ID and device ID only, that's plenty enough 525 */ 526 for (devfn = 0; devfn < 0x100; devfn++) { 527 u8 __iomem *devbase = cfgspace + (devfn << 8); 528 u8 hdr_type = readb(devbase + PCI_HEADER_TYPE); 529 u32 l = readl(devbase + PCI_VENDOR_ID); 530 u16 s; 531 532 DBG("devfn %x, l: %x\n", devfn, l); 533 534 /* If no device, skip */ 535 if (l == 0xffffffff || l == 0x00000000 || 536 l == 0x0000ffff || l == 0xffff0000) 537 goto next; 538 /* Check if is supports capability lists */ 539 s = readw(devbase + PCI_STATUS); 540 if (!(s & PCI_STATUS_CAP_LIST)) 541 goto next; 542 543 mpic_scan_ht_pic(mpic, devbase, devfn, l); 544 mpic_scan_ht_msi(mpic, devbase, devfn); 545 546 next: 547 /* next device, if function 0 */ 548 if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0) 549 devfn += 7; 550 } 551 } 552 553 #else /* CONFIG_MPIC_U3_HT_IRQS */ 554 555 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source) 556 { 557 return 0; 558 } 559 560 static void __init mpic_scan_ht_pics(struct mpic *mpic) 561 { 562 } 563 564 #endif /* CONFIG_MPIC_U3_HT_IRQS */ 565 566 #ifdef CONFIG_SMP 567 static int irq_choose_cpu(unsigned int virt_irq) 568 { 569 cpumask_t mask = irq_desc[virt_irq].affinity; 570 int cpuid; 571 572 if (cpus_equal(mask, CPU_MASK_ALL)) { 573 static int irq_rover; 574 static DEFINE_SPINLOCK(irq_rover_lock); 575 unsigned long flags; 576 577 /* Round-robin distribution... */ 578 do_round_robin: 579 spin_lock_irqsave(&irq_rover_lock, flags); 580 581 while (!cpu_online(irq_rover)) { 582 if (++irq_rover >= NR_CPUS) 583 irq_rover = 0; 584 } 585 cpuid = irq_rover; 586 do { 587 if (++irq_rover >= NR_CPUS) 588 irq_rover = 0; 589 } while (!cpu_online(irq_rover)); 590 591 spin_unlock_irqrestore(&irq_rover_lock, flags); 592 } else { 593 cpumask_t tmp; 594 595 cpus_and(tmp, cpu_online_map, mask); 596 597 if (cpus_empty(tmp)) 598 goto do_round_robin; 599 600 cpuid = first_cpu(tmp); 601 } 602 603 return cpuid; 604 } 605 #else 606 static int irq_choose_cpu(unsigned int virt_irq) 607 { 608 return hard_smp_processor_id(); 609 } 610 #endif 611 612 #define mpic_irq_to_hw(virq) ((unsigned int)irq_map[virq].hwirq) 613 614 /* Find an mpic associated with a given linux interrupt */ 615 static struct mpic *mpic_find(unsigned int irq, unsigned int *is_ipi) 616 { 617 unsigned int src = mpic_irq_to_hw(irq); 618 struct mpic *mpic; 619 620 if (irq < NUM_ISA_INTERRUPTS) 621 return NULL; 622 623 mpic = irq_desc[irq].chip_data; 624 625 if (is_ipi) 626 *is_ipi = (src >= mpic->ipi_vecs[0] && 627 src <= mpic->ipi_vecs[3]); 628 629 return mpic; 630 } 631 632 /* Convert a cpu mask from logical to physical cpu numbers. */ 633 static inline u32 mpic_physmask(u32 cpumask) 634 { 635 int i; 636 u32 mask = 0; 637 638 for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1) 639 mask |= (cpumask & 1) << get_hard_smp_processor_id(i); 640 return mask; 641 } 642 643 #ifdef CONFIG_SMP 644 /* Get the mpic structure from the IPI number */ 645 static inline struct mpic * mpic_from_ipi(unsigned int ipi) 646 { 647 return irq_desc[ipi].chip_data; 648 } 649 #endif 650 651 /* Get the mpic structure from the irq number */ 652 static inline struct mpic * mpic_from_irq(unsigned int irq) 653 { 654 return irq_desc[irq].chip_data; 655 } 656 657 /* Send an EOI */ 658 static inline void mpic_eoi(struct mpic *mpic) 659 { 660 mpic_cpu_write(MPIC_INFO(CPU_EOI), 0); 661 (void)mpic_cpu_read(MPIC_INFO(CPU_WHOAMI)); 662 } 663 664 #ifdef CONFIG_SMP 665 static irqreturn_t mpic_ipi_action(int irq, void *data) 666 { 667 long ipi = (long)data; 668 669 smp_message_recv(ipi); 670 671 return IRQ_HANDLED; 672 } 673 #endif /* CONFIG_SMP */ 674 675 /* 676 * Linux descriptor level callbacks 677 */ 678 679 680 void mpic_unmask_irq(unsigned int irq) 681 { 682 unsigned int loops = 100000; 683 struct mpic *mpic = mpic_from_irq(irq); 684 unsigned int src = mpic_irq_to_hw(irq); 685 686 DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, irq, src); 687 688 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), 689 mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & 690 ~MPIC_VECPRI_MASK); 691 /* make sure mask gets to controller before we return to user */ 692 do { 693 if (!loops--) { 694 printk(KERN_ERR "mpic_enable_irq timeout\n"); 695 break; 696 } 697 } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK); 698 } 699 700 void mpic_mask_irq(unsigned int irq) 701 { 702 unsigned int loops = 100000; 703 struct mpic *mpic = mpic_from_irq(irq); 704 unsigned int src = mpic_irq_to_hw(irq); 705 706 DBG("%s: disable_irq: %d (src %d)\n", mpic->name, irq, src); 707 708 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), 709 mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) | 710 MPIC_VECPRI_MASK); 711 712 /* make sure mask gets to controller before we return to user */ 713 do { 714 if (!loops--) { 715 printk(KERN_ERR "mpic_enable_irq timeout\n"); 716 break; 717 } 718 } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK)); 719 } 720 721 void mpic_end_irq(unsigned int irq) 722 { 723 struct mpic *mpic = mpic_from_irq(irq); 724 725 #ifdef DEBUG_IRQ 726 DBG("%s: end_irq: %d\n", mpic->name, irq); 727 #endif 728 /* We always EOI on end_irq() even for edge interrupts since that 729 * should only lower the priority, the MPIC should have properly 730 * latched another edge interrupt coming in anyway 731 */ 732 733 mpic_eoi(mpic); 734 } 735 736 #ifdef CONFIG_MPIC_U3_HT_IRQS 737 738 static void mpic_unmask_ht_irq(unsigned int irq) 739 { 740 struct mpic *mpic = mpic_from_irq(irq); 741 unsigned int src = mpic_irq_to_hw(irq); 742 743 mpic_unmask_irq(irq); 744 745 if (irq_desc[irq].status & IRQ_LEVEL) 746 mpic_ht_end_irq(mpic, src); 747 } 748 749 static unsigned int mpic_startup_ht_irq(unsigned int irq) 750 { 751 struct mpic *mpic = mpic_from_irq(irq); 752 unsigned int src = mpic_irq_to_hw(irq); 753 754 mpic_unmask_irq(irq); 755 mpic_startup_ht_interrupt(mpic, src, irq_desc[irq].status); 756 757 return 0; 758 } 759 760 static void mpic_shutdown_ht_irq(unsigned int irq) 761 { 762 struct mpic *mpic = mpic_from_irq(irq); 763 unsigned int src = mpic_irq_to_hw(irq); 764 765 mpic_shutdown_ht_interrupt(mpic, src, irq_desc[irq].status); 766 mpic_mask_irq(irq); 767 } 768 769 static void mpic_end_ht_irq(unsigned int irq) 770 { 771 struct mpic *mpic = mpic_from_irq(irq); 772 unsigned int src = mpic_irq_to_hw(irq); 773 774 #ifdef DEBUG_IRQ 775 DBG("%s: end_irq: %d\n", mpic->name, irq); 776 #endif 777 /* We always EOI on end_irq() even for edge interrupts since that 778 * should only lower the priority, the MPIC should have properly 779 * latched another edge interrupt coming in anyway 780 */ 781 782 if (irq_desc[irq].status & IRQ_LEVEL) 783 mpic_ht_end_irq(mpic, src); 784 mpic_eoi(mpic); 785 } 786 #endif /* !CONFIG_MPIC_U3_HT_IRQS */ 787 788 #ifdef CONFIG_SMP 789 790 static void mpic_unmask_ipi(unsigned int irq) 791 { 792 struct mpic *mpic = mpic_from_ipi(irq); 793 unsigned int src = mpic_irq_to_hw(irq) - mpic->ipi_vecs[0]; 794 795 DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, irq, src); 796 mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK); 797 } 798 799 static void mpic_mask_ipi(unsigned int irq) 800 { 801 /* NEVER disable an IPI... that's just plain wrong! */ 802 } 803 804 static void mpic_end_ipi(unsigned int irq) 805 { 806 struct mpic *mpic = mpic_from_ipi(irq); 807 808 /* 809 * IPIs are marked IRQ_PER_CPU. This has the side effect of 810 * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from 811 * applying to them. We EOI them late to avoid re-entering. 812 * We mark IPI's with IRQF_DISABLED as they must run with 813 * irqs disabled. 814 */ 815 mpic_eoi(mpic); 816 } 817 818 #endif /* CONFIG_SMP */ 819 820 void mpic_set_affinity(unsigned int irq, cpumask_t cpumask) 821 { 822 struct mpic *mpic = mpic_from_irq(irq); 823 unsigned int src = mpic_irq_to_hw(irq); 824 825 if (mpic->flags & MPIC_SINGLE_DEST_CPU) { 826 int cpuid = irq_choose_cpu(irq); 827 828 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid); 829 } else { 830 cpumask_t tmp; 831 832 cpus_and(tmp, cpumask, cpu_online_map); 833 834 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 835 mpic_physmask(cpus_addr(tmp)[0])); 836 } 837 } 838 839 static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type) 840 { 841 /* Now convert sense value */ 842 switch(type & IRQ_TYPE_SENSE_MASK) { 843 case IRQ_TYPE_EDGE_RISING: 844 return MPIC_INFO(VECPRI_SENSE_EDGE) | 845 MPIC_INFO(VECPRI_POLARITY_POSITIVE); 846 case IRQ_TYPE_EDGE_FALLING: 847 case IRQ_TYPE_EDGE_BOTH: 848 return MPIC_INFO(VECPRI_SENSE_EDGE) | 849 MPIC_INFO(VECPRI_POLARITY_NEGATIVE); 850 case IRQ_TYPE_LEVEL_HIGH: 851 return MPIC_INFO(VECPRI_SENSE_LEVEL) | 852 MPIC_INFO(VECPRI_POLARITY_POSITIVE); 853 case IRQ_TYPE_LEVEL_LOW: 854 default: 855 return MPIC_INFO(VECPRI_SENSE_LEVEL) | 856 MPIC_INFO(VECPRI_POLARITY_NEGATIVE); 857 } 858 } 859 860 int mpic_set_irq_type(unsigned int virq, unsigned int flow_type) 861 { 862 struct mpic *mpic = mpic_from_irq(virq); 863 unsigned int src = mpic_irq_to_hw(virq); 864 struct irq_desc *desc = get_irq_desc(virq); 865 unsigned int vecpri, vold, vnew; 866 867 DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n", 868 mpic, virq, src, flow_type); 869 870 if (src >= mpic->irq_count) 871 return -EINVAL; 872 873 if (flow_type == IRQ_TYPE_NONE) 874 if (mpic->senses && src < mpic->senses_count) 875 flow_type = mpic->senses[src]; 876 if (flow_type == IRQ_TYPE_NONE) 877 flow_type = IRQ_TYPE_LEVEL_LOW; 878 879 desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL); 880 desc->status |= flow_type & IRQ_TYPE_SENSE_MASK; 881 if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) 882 desc->status |= IRQ_LEVEL; 883 884 if (mpic_is_ht_interrupt(mpic, src)) 885 vecpri = MPIC_VECPRI_POLARITY_POSITIVE | 886 MPIC_VECPRI_SENSE_EDGE; 887 else 888 vecpri = mpic_type_to_vecpri(mpic, flow_type); 889 890 vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)); 891 vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) | 892 MPIC_INFO(VECPRI_SENSE_MASK)); 893 vnew |= vecpri; 894 if (vold != vnew) 895 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew); 896 897 return 0; 898 } 899 900 void mpic_set_vector(unsigned int virq, unsigned int vector) 901 { 902 struct mpic *mpic = mpic_from_irq(virq); 903 unsigned int src = mpic_irq_to_hw(virq); 904 unsigned int vecpri; 905 906 DBG("mpic: set_vector(mpic:@%p,virq:%d,src:%d,vector:0x%x)\n", 907 mpic, virq, src, vector); 908 909 if (src >= mpic->irq_count) 910 return; 911 912 vecpri = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)); 913 vecpri = vecpri & ~MPIC_INFO(VECPRI_VECTOR_MASK); 914 vecpri |= vector; 915 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vecpri); 916 } 917 918 static struct irq_chip mpic_irq_chip = { 919 .mask = mpic_mask_irq, 920 .unmask = mpic_unmask_irq, 921 .eoi = mpic_end_irq, 922 .set_type = mpic_set_irq_type, 923 }; 924 925 #ifdef CONFIG_SMP 926 static struct irq_chip mpic_ipi_chip = { 927 .mask = mpic_mask_ipi, 928 .unmask = mpic_unmask_ipi, 929 .eoi = mpic_end_ipi, 930 }; 931 #endif /* CONFIG_SMP */ 932 933 #ifdef CONFIG_MPIC_U3_HT_IRQS 934 static struct irq_chip mpic_irq_ht_chip = { 935 .startup = mpic_startup_ht_irq, 936 .shutdown = mpic_shutdown_ht_irq, 937 .mask = mpic_mask_irq, 938 .unmask = mpic_unmask_ht_irq, 939 .eoi = mpic_end_ht_irq, 940 .set_type = mpic_set_irq_type, 941 }; 942 #endif /* CONFIG_MPIC_U3_HT_IRQS */ 943 944 945 static int mpic_host_match(struct irq_host *h, struct device_node *node) 946 { 947 /* Exact match, unless mpic node is NULL */ 948 return h->of_node == NULL || h->of_node == node; 949 } 950 951 static int mpic_host_map(struct irq_host *h, unsigned int virq, 952 irq_hw_number_t hw) 953 { 954 struct mpic *mpic = h->host_data; 955 struct irq_chip *chip; 956 957 DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw); 958 959 if (hw == mpic->spurious_vec) 960 return -EINVAL; 961 if (mpic->protected && test_bit(hw, mpic->protected)) 962 return -EINVAL; 963 964 #ifdef CONFIG_SMP 965 else if (hw >= mpic->ipi_vecs[0]) { 966 WARN_ON(!(mpic->flags & MPIC_PRIMARY)); 967 968 DBG("mpic: mapping as IPI\n"); 969 set_irq_chip_data(virq, mpic); 970 set_irq_chip_and_handler(virq, &mpic->hc_ipi, 971 handle_percpu_irq); 972 return 0; 973 } 974 #endif /* CONFIG_SMP */ 975 976 if (hw >= mpic->irq_count) 977 return -EINVAL; 978 979 mpic_msi_reserve_hwirq(mpic, hw); 980 981 /* Default chip */ 982 chip = &mpic->hc_irq; 983 984 #ifdef CONFIG_MPIC_U3_HT_IRQS 985 /* Check for HT interrupts, override vecpri */ 986 if (mpic_is_ht_interrupt(mpic, hw)) 987 chip = &mpic->hc_ht_irq; 988 #endif /* CONFIG_MPIC_U3_HT_IRQS */ 989 990 DBG("mpic: mapping to irq chip @%p\n", chip); 991 992 set_irq_chip_data(virq, mpic); 993 set_irq_chip_and_handler(virq, chip, handle_fasteoi_irq); 994 995 /* Set default irq type */ 996 set_irq_type(virq, IRQ_TYPE_NONE); 997 998 return 0; 999 } 1000 1001 static int mpic_host_xlate(struct irq_host *h, struct device_node *ct, 1002 u32 *intspec, unsigned int intsize, 1003 irq_hw_number_t *out_hwirq, unsigned int *out_flags) 1004 1005 { 1006 static unsigned char map_mpic_senses[4] = { 1007 IRQ_TYPE_EDGE_RISING, 1008 IRQ_TYPE_LEVEL_LOW, 1009 IRQ_TYPE_LEVEL_HIGH, 1010 IRQ_TYPE_EDGE_FALLING, 1011 }; 1012 1013 *out_hwirq = intspec[0]; 1014 if (intsize > 1) { 1015 u32 mask = 0x3; 1016 1017 /* Apple invented a new race of encoding on machines with 1018 * an HT APIC. They encode, among others, the index within 1019 * the HT APIC. We don't care about it here since thankfully, 1020 * it appears that they have the APIC already properly 1021 * configured, and thus our current fixup code that reads the 1022 * APIC config works fine. However, we still need to mask out 1023 * bits in the specifier to make sure we only get bit 0 which 1024 * is the level/edge bit (the only sense bit exposed by Apple), 1025 * as their bit 1 means something else. 1026 */ 1027 if (machine_is(powermac)) 1028 mask = 0x1; 1029 *out_flags = map_mpic_senses[intspec[1] & mask]; 1030 } else 1031 *out_flags = IRQ_TYPE_NONE; 1032 1033 DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n", 1034 intsize, intspec[0], intspec[1], *out_hwirq, *out_flags); 1035 1036 return 0; 1037 } 1038 1039 static struct irq_host_ops mpic_host_ops = { 1040 .match = mpic_host_match, 1041 .map = mpic_host_map, 1042 .xlate = mpic_host_xlate, 1043 }; 1044 1045 /* 1046 * Exported functions 1047 */ 1048 1049 struct mpic * __init mpic_alloc(struct device_node *node, 1050 phys_addr_t phys_addr, 1051 unsigned int flags, 1052 unsigned int isu_size, 1053 unsigned int irq_count, 1054 const char *name) 1055 { 1056 struct mpic *mpic; 1057 u32 greg_feature; 1058 const char *vers; 1059 int i; 1060 int intvec_top; 1061 u64 paddr = phys_addr; 1062 1063 mpic = alloc_bootmem(sizeof(struct mpic)); 1064 if (mpic == NULL) 1065 return NULL; 1066 1067 memset(mpic, 0, sizeof(struct mpic)); 1068 mpic->name = name; 1069 1070 mpic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR, 1071 isu_size, &mpic_host_ops, 1072 flags & MPIC_LARGE_VECTORS ? 2048 : 256); 1073 if (mpic->irqhost == NULL) 1074 return NULL; 1075 1076 mpic->irqhost->host_data = mpic; 1077 mpic->hc_irq = mpic_irq_chip; 1078 mpic->hc_irq.typename = name; 1079 if (flags & MPIC_PRIMARY) 1080 mpic->hc_irq.set_affinity = mpic_set_affinity; 1081 #ifdef CONFIG_MPIC_U3_HT_IRQS 1082 mpic->hc_ht_irq = mpic_irq_ht_chip; 1083 mpic->hc_ht_irq.typename = name; 1084 if (flags & MPIC_PRIMARY) 1085 mpic->hc_ht_irq.set_affinity = mpic_set_affinity; 1086 #endif /* CONFIG_MPIC_U3_HT_IRQS */ 1087 1088 #ifdef CONFIG_SMP 1089 mpic->hc_ipi = mpic_ipi_chip; 1090 mpic->hc_ipi.typename = name; 1091 #endif /* CONFIG_SMP */ 1092 1093 mpic->flags = flags; 1094 mpic->isu_size = isu_size; 1095 mpic->irq_count = irq_count; 1096 mpic->num_sources = 0; /* so far */ 1097 1098 if (flags & MPIC_LARGE_VECTORS) 1099 intvec_top = 2047; 1100 else 1101 intvec_top = 255; 1102 1103 mpic->timer_vecs[0] = intvec_top - 8; 1104 mpic->timer_vecs[1] = intvec_top - 7; 1105 mpic->timer_vecs[2] = intvec_top - 6; 1106 mpic->timer_vecs[3] = intvec_top - 5; 1107 mpic->ipi_vecs[0] = intvec_top - 4; 1108 mpic->ipi_vecs[1] = intvec_top - 3; 1109 mpic->ipi_vecs[2] = intvec_top - 2; 1110 mpic->ipi_vecs[3] = intvec_top - 1; 1111 mpic->spurious_vec = intvec_top; 1112 1113 /* Check for "big-endian" in device-tree */ 1114 if (node && of_get_property(node, "big-endian", NULL) != NULL) 1115 mpic->flags |= MPIC_BIG_ENDIAN; 1116 1117 /* Look for protected sources */ 1118 if (node) { 1119 int psize; 1120 unsigned int bits, mapsize; 1121 const u32 *psrc = 1122 of_get_property(node, "protected-sources", &psize); 1123 if (psrc) { 1124 psize /= 4; 1125 bits = intvec_top + 1; 1126 mapsize = BITS_TO_LONGS(bits) * sizeof(unsigned long); 1127 mpic->protected = alloc_bootmem(mapsize); 1128 BUG_ON(mpic->protected == NULL); 1129 memset(mpic->protected, 0, mapsize); 1130 for (i = 0; i < psize; i++) { 1131 if (psrc[i] > intvec_top) 1132 continue; 1133 __set_bit(psrc[i], mpic->protected); 1134 } 1135 } 1136 } 1137 1138 #ifdef CONFIG_MPIC_WEIRD 1139 mpic->hw_set = mpic_infos[MPIC_GET_REGSET(flags)]; 1140 #endif 1141 1142 /* default register type */ 1143 mpic->reg_type = (flags & MPIC_BIG_ENDIAN) ? 1144 mpic_access_mmio_be : mpic_access_mmio_le; 1145 1146 /* If no physical address is passed in, a device-node is mandatory */ 1147 BUG_ON(paddr == 0 && node == NULL); 1148 1149 /* If no physical address passed in, check if it's dcr based */ 1150 if (paddr == 0 && of_get_property(node, "dcr-reg", NULL) != NULL) { 1151 #ifdef CONFIG_PPC_DCR 1152 mpic->flags |= MPIC_USES_DCR; 1153 mpic->reg_type = mpic_access_dcr; 1154 #else 1155 BUG(); 1156 #endif /* CONFIG_PPC_DCR */ 1157 } 1158 1159 /* If the MPIC is not DCR based, and no physical address was passed 1160 * in, try to obtain one 1161 */ 1162 if (paddr == 0 && !(mpic->flags & MPIC_USES_DCR)) { 1163 const u32 *reg = of_get_property(node, "reg", NULL); 1164 BUG_ON(reg == NULL); 1165 paddr = of_translate_address(node, reg); 1166 BUG_ON(paddr == OF_BAD_ADDR); 1167 } 1168 1169 /* Map the global registers */ 1170 mpic_map(mpic, paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000); 1171 mpic_map(mpic, paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000); 1172 1173 /* Reset */ 1174 if (flags & MPIC_WANTS_RESET) { 1175 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0), 1176 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0)) 1177 | MPIC_GREG_GCONF_RESET); 1178 while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0)) 1179 & MPIC_GREG_GCONF_RESET) 1180 mb(); 1181 } 1182 1183 if (flags & MPIC_ENABLE_MCK) 1184 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0), 1185 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0)) 1186 | MPIC_GREG_GCONF_MCK); 1187 1188 /* Read feature register, calculate num CPUs and, for non-ISU 1189 * MPICs, num sources as well. On ISU MPICs, sources are counted 1190 * as ISUs are added 1191 */ 1192 greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0)); 1193 mpic->num_cpus = ((greg_feature & MPIC_GREG_FEATURE_LAST_CPU_MASK) 1194 >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1; 1195 if (isu_size == 0) { 1196 if (flags & MPIC_BROKEN_FRR_NIRQS) 1197 mpic->num_sources = mpic->irq_count; 1198 else 1199 mpic->num_sources = 1200 ((greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK) 1201 >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1; 1202 } 1203 1204 /* Map the per-CPU registers */ 1205 for (i = 0; i < mpic->num_cpus; i++) { 1206 mpic_map(mpic, paddr, &mpic->cpuregs[i], 1207 MPIC_INFO(CPU_BASE) + i * MPIC_INFO(CPU_STRIDE), 1208 0x1000); 1209 } 1210 1211 /* Initialize main ISU if none provided */ 1212 if (mpic->isu_size == 0) { 1213 mpic->isu_size = mpic->num_sources; 1214 mpic_map(mpic, paddr, &mpic->isus[0], 1215 MPIC_INFO(IRQ_BASE), MPIC_INFO(IRQ_STRIDE) * mpic->isu_size); 1216 } 1217 mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1); 1218 mpic->isu_mask = (1 << mpic->isu_shift) - 1; 1219 1220 /* Display version */ 1221 switch (greg_feature & MPIC_GREG_FEATURE_VERSION_MASK) { 1222 case 1: 1223 vers = "1.0"; 1224 break; 1225 case 2: 1226 vers = "1.2"; 1227 break; 1228 case 3: 1229 vers = "1.3"; 1230 break; 1231 default: 1232 vers = "<unknown>"; 1233 break; 1234 } 1235 printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx," 1236 " max %d CPUs\n", 1237 name, vers, (unsigned long long)paddr, mpic->num_cpus); 1238 printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n", 1239 mpic->isu_size, mpic->isu_shift, mpic->isu_mask); 1240 1241 mpic->next = mpics; 1242 mpics = mpic; 1243 1244 if (flags & MPIC_PRIMARY) { 1245 mpic_primary = mpic; 1246 irq_set_default_host(mpic->irqhost); 1247 } 1248 1249 return mpic; 1250 } 1251 1252 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num, 1253 phys_addr_t paddr) 1254 { 1255 unsigned int isu_first = isu_num * mpic->isu_size; 1256 1257 BUG_ON(isu_num >= MPIC_MAX_ISU); 1258 1259 mpic_map(mpic, paddr, &mpic->isus[isu_num], 0, 1260 MPIC_INFO(IRQ_STRIDE) * mpic->isu_size); 1261 if ((isu_first + mpic->isu_size) > mpic->num_sources) 1262 mpic->num_sources = isu_first + mpic->isu_size; 1263 } 1264 1265 void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count) 1266 { 1267 mpic->senses = senses; 1268 mpic->senses_count = count; 1269 } 1270 1271 void __init mpic_init(struct mpic *mpic) 1272 { 1273 int i; 1274 1275 BUG_ON(mpic->num_sources == 0); 1276 1277 printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources); 1278 1279 /* Set current processor priority to max */ 1280 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf); 1281 1282 /* Initialize timers: just disable them all */ 1283 for (i = 0; i < 4; i++) { 1284 mpic_write(mpic->tmregs, 1285 i * MPIC_INFO(TIMER_STRIDE) + 1286 MPIC_INFO(TIMER_DESTINATION), 0); 1287 mpic_write(mpic->tmregs, 1288 i * MPIC_INFO(TIMER_STRIDE) + 1289 MPIC_INFO(TIMER_VECTOR_PRI), 1290 MPIC_VECPRI_MASK | 1291 (mpic->timer_vecs[0] + i)); 1292 } 1293 1294 /* Initialize IPIs to our reserved vectors and mark them disabled for now */ 1295 mpic_test_broken_ipi(mpic); 1296 for (i = 0; i < 4; i++) { 1297 mpic_ipi_write(i, 1298 MPIC_VECPRI_MASK | 1299 (10 << MPIC_VECPRI_PRIORITY_SHIFT) | 1300 (mpic->ipi_vecs[0] + i)); 1301 } 1302 1303 /* Initialize interrupt sources */ 1304 if (mpic->irq_count == 0) 1305 mpic->irq_count = mpic->num_sources; 1306 1307 /* Do the HT PIC fixups on U3 broken mpic */ 1308 DBG("MPIC flags: %x\n", mpic->flags); 1309 if ((mpic->flags & MPIC_U3_HT_IRQS) && (mpic->flags & MPIC_PRIMARY)) { 1310 mpic_scan_ht_pics(mpic); 1311 mpic_u3msi_init(mpic); 1312 } 1313 1314 mpic_pasemi_msi_init(mpic); 1315 1316 for (i = 0; i < mpic->num_sources; i++) { 1317 /* start with vector = source number, and masked */ 1318 u32 vecpri = MPIC_VECPRI_MASK | i | 1319 (8 << MPIC_VECPRI_PRIORITY_SHIFT); 1320 1321 /* check if protected */ 1322 if (mpic->protected && test_bit(i, mpic->protected)) 1323 continue; 1324 /* init hw */ 1325 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri); 1326 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1327 1 << hard_smp_processor_id()); 1328 } 1329 1330 /* Init spurious vector */ 1331 mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), mpic->spurious_vec); 1332 1333 /* Disable 8259 passthrough, if supported */ 1334 if (!(mpic->flags & MPIC_NO_PTHROU_DIS)) 1335 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0), 1336 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0)) 1337 | MPIC_GREG_GCONF_8259_PTHROU_DIS); 1338 1339 if (mpic->flags & MPIC_NO_BIAS) 1340 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0), 1341 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0)) 1342 | MPIC_GREG_GCONF_NO_BIAS); 1343 1344 /* Set current processor priority to 0 */ 1345 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0); 1346 1347 #ifdef CONFIG_PM 1348 /* allocate memory to save mpic state */ 1349 mpic->save_data = alloc_bootmem(mpic->num_sources * sizeof(struct mpic_irq_save)); 1350 BUG_ON(mpic->save_data == NULL); 1351 #endif 1352 } 1353 1354 void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio) 1355 { 1356 u32 v; 1357 1358 v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1); 1359 v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK; 1360 v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio); 1361 mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v); 1362 } 1363 1364 void __init mpic_set_serial_int(struct mpic *mpic, int enable) 1365 { 1366 unsigned long flags; 1367 u32 v; 1368 1369 spin_lock_irqsave(&mpic_lock, flags); 1370 v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1); 1371 if (enable) 1372 v |= MPIC_GREG_GLOBAL_CONF_1_SIE; 1373 else 1374 v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE; 1375 mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v); 1376 spin_unlock_irqrestore(&mpic_lock, flags); 1377 } 1378 1379 void mpic_irq_set_priority(unsigned int irq, unsigned int pri) 1380 { 1381 unsigned int is_ipi; 1382 struct mpic *mpic = mpic_find(irq, &is_ipi); 1383 unsigned int src = mpic_irq_to_hw(irq); 1384 unsigned long flags; 1385 u32 reg; 1386 1387 if (!mpic) 1388 return; 1389 1390 spin_lock_irqsave(&mpic_lock, flags); 1391 if (is_ipi) { 1392 reg = mpic_ipi_read(src - mpic->ipi_vecs[0]) & 1393 ~MPIC_VECPRI_PRIORITY_MASK; 1394 mpic_ipi_write(src - mpic->ipi_vecs[0], 1395 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT)); 1396 } else { 1397 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) 1398 & ~MPIC_VECPRI_PRIORITY_MASK; 1399 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), 1400 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT)); 1401 } 1402 spin_unlock_irqrestore(&mpic_lock, flags); 1403 } 1404 1405 void mpic_setup_this_cpu(void) 1406 { 1407 #ifdef CONFIG_SMP 1408 struct mpic *mpic = mpic_primary; 1409 unsigned long flags; 1410 u32 msk = 1 << hard_smp_processor_id(); 1411 unsigned int i; 1412 1413 BUG_ON(mpic == NULL); 1414 1415 DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id()); 1416 1417 spin_lock_irqsave(&mpic_lock, flags); 1418 1419 /* let the mpic know we want intrs. default affinity is 0xffffffff 1420 * until changed via /proc. That's how it's done on x86. If we want 1421 * it differently, then we should make sure we also change the default 1422 * values of irq_desc[].affinity in irq.c. 1423 */ 1424 if (distribute_irqs) { 1425 for (i = 0; i < mpic->num_sources ; i++) 1426 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1427 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk); 1428 } 1429 1430 /* Set current processor priority to 0 */ 1431 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0); 1432 1433 spin_unlock_irqrestore(&mpic_lock, flags); 1434 #endif /* CONFIG_SMP */ 1435 } 1436 1437 int mpic_cpu_get_priority(void) 1438 { 1439 struct mpic *mpic = mpic_primary; 1440 1441 return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI)); 1442 } 1443 1444 void mpic_cpu_set_priority(int prio) 1445 { 1446 struct mpic *mpic = mpic_primary; 1447 1448 prio &= MPIC_CPU_TASKPRI_MASK; 1449 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio); 1450 } 1451 1452 void mpic_teardown_this_cpu(int secondary) 1453 { 1454 struct mpic *mpic = mpic_primary; 1455 unsigned long flags; 1456 u32 msk = 1 << hard_smp_processor_id(); 1457 unsigned int i; 1458 1459 BUG_ON(mpic == NULL); 1460 1461 DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id()); 1462 spin_lock_irqsave(&mpic_lock, flags); 1463 1464 /* let the mpic know we don't want intrs. */ 1465 for (i = 0; i < mpic->num_sources ; i++) 1466 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1467 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk); 1468 1469 /* Set current processor priority to max */ 1470 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf); 1471 /* We need to EOI the IPI since not all platforms reset the MPIC 1472 * on boot and new interrupts wouldn't get delivered otherwise. 1473 */ 1474 mpic_eoi(mpic); 1475 1476 spin_unlock_irqrestore(&mpic_lock, flags); 1477 } 1478 1479 1480 void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask) 1481 { 1482 struct mpic *mpic = mpic_primary; 1483 1484 BUG_ON(mpic == NULL); 1485 1486 #ifdef DEBUG_IPI 1487 DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no); 1488 #endif 1489 1490 mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) + 1491 ipi_no * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE), 1492 mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0])); 1493 } 1494 1495 static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg) 1496 { 1497 u32 src; 1498 1499 src = mpic_cpu_read(reg) & MPIC_INFO(VECPRI_VECTOR_MASK); 1500 #ifdef DEBUG_LOW 1501 DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic->name, reg, src); 1502 #endif 1503 if (unlikely(src == mpic->spurious_vec)) { 1504 if (mpic->flags & MPIC_SPV_EOI) 1505 mpic_eoi(mpic); 1506 return NO_IRQ; 1507 } 1508 if (unlikely(mpic->protected && test_bit(src, mpic->protected))) { 1509 if (printk_ratelimit()) 1510 printk(KERN_WARNING "%s: Got protected source %d !\n", 1511 mpic->name, (int)src); 1512 mpic_eoi(mpic); 1513 return NO_IRQ; 1514 } 1515 1516 return irq_linear_revmap(mpic->irqhost, src); 1517 } 1518 1519 unsigned int mpic_get_one_irq(struct mpic *mpic) 1520 { 1521 return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK)); 1522 } 1523 1524 unsigned int mpic_get_irq(void) 1525 { 1526 struct mpic *mpic = mpic_primary; 1527 1528 BUG_ON(mpic == NULL); 1529 1530 return mpic_get_one_irq(mpic); 1531 } 1532 1533 unsigned int mpic_get_mcirq(void) 1534 { 1535 struct mpic *mpic = mpic_primary; 1536 1537 BUG_ON(mpic == NULL); 1538 1539 return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_MCACK)); 1540 } 1541 1542 #ifdef CONFIG_SMP 1543 void mpic_request_ipis(void) 1544 { 1545 struct mpic *mpic = mpic_primary; 1546 long i, err; 1547 static char *ipi_names[] = { 1548 "IPI0 (call function)", 1549 "IPI1 (reschedule)", 1550 "IPI2 (call function single)", 1551 "IPI3 (debugger break)", 1552 }; 1553 BUG_ON(mpic == NULL); 1554 1555 printk(KERN_INFO "mpic: requesting IPIs ... \n"); 1556 1557 for (i = 0; i < 4; i++) { 1558 unsigned int vipi = irq_create_mapping(mpic->irqhost, 1559 mpic->ipi_vecs[0] + i); 1560 if (vipi == NO_IRQ) { 1561 printk(KERN_ERR "Failed to map IPI %ld\n", i); 1562 break; 1563 } 1564 err = request_irq(vipi, mpic_ipi_action, 1565 IRQF_DISABLED|IRQF_PERCPU, 1566 ipi_names[i], (void *)i); 1567 if (err) { 1568 printk(KERN_ERR "Request of irq %d for IPI %ld failed\n", 1569 vipi, i); 1570 break; 1571 } 1572 } 1573 } 1574 1575 void smp_mpic_message_pass(int target, int msg) 1576 { 1577 /* make sure we're sending something that translates to an IPI */ 1578 if ((unsigned int)msg > 3) { 1579 printk("SMP %d: smp_message_pass: unknown msg %d\n", 1580 smp_processor_id(), msg); 1581 return; 1582 } 1583 switch (target) { 1584 case MSG_ALL: 1585 mpic_send_ipi(msg, 0xffffffff); 1586 break; 1587 case MSG_ALL_BUT_SELF: 1588 mpic_send_ipi(msg, 0xffffffff & ~(1 << smp_processor_id())); 1589 break; 1590 default: 1591 mpic_send_ipi(msg, 1 << target); 1592 break; 1593 } 1594 } 1595 1596 int __init smp_mpic_probe(void) 1597 { 1598 int nr_cpus; 1599 1600 DBG("smp_mpic_probe()...\n"); 1601 1602 nr_cpus = cpus_weight(cpu_possible_map); 1603 1604 DBG("nr_cpus: %d\n", nr_cpus); 1605 1606 if (nr_cpus > 1) 1607 mpic_request_ipis(); 1608 1609 return nr_cpus; 1610 } 1611 1612 void __devinit smp_mpic_setup_cpu(int cpu) 1613 { 1614 mpic_setup_this_cpu(); 1615 } 1616 #endif /* CONFIG_SMP */ 1617 1618 #ifdef CONFIG_PM 1619 static int mpic_suspend(struct sys_device *dev, pm_message_t state) 1620 { 1621 struct mpic *mpic = container_of(dev, struct mpic, sysdev); 1622 int i; 1623 1624 for (i = 0; i < mpic->num_sources; i++) { 1625 mpic->save_data[i].vecprio = 1626 mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI)); 1627 mpic->save_data[i].dest = 1628 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)); 1629 } 1630 1631 return 0; 1632 } 1633 1634 static int mpic_resume(struct sys_device *dev) 1635 { 1636 struct mpic *mpic = container_of(dev, struct mpic, sysdev); 1637 int i; 1638 1639 for (i = 0; i < mpic->num_sources; i++) { 1640 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), 1641 mpic->save_data[i].vecprio); 1642 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1643 mpic->save_data[i].dest); 1644 1645 #ifdef CONFIG_MPIC_U3_HT_IRQS 1646 { 1647 struct mpic_irq_fixup *fixup = &mpic->fixups[i]; 1648 1649 if (fixup->base) { 1650 /* we use the lowest bit in an inverted meaning */ 1651 if ((mpic->save_data[i].fixup_data & 1) == 0) 1652 continue; 1653 1654 /* Enable and configure */ 1655 writeb(0x10 + 2 * fixup->index, fixup->base + 2); 1656 1657 writel(mpic->save_data[i].fixup_data & ~1, 1658 fixup->base + 4); 1659 } 1660 } 1661 #endif 1662 } /* end for loop */ 1663 1664 return 0; 1665 } 1666 #endif 1667 1668 static struct sysdev_class mpic_sysclass = { 1669 #ifdef CONFIG_PM 1670 .resume = mpic_resume, 1671 .suspend = mpic_suspend, 1672 #endif 1673 .name = "mpic", 1674 }; 1675 1676 static int mpic_init_sys(void) 1677 { 1678 struct mpic *mpic = mpics; 1679 int error, id = 0; 1680 1681 error = sysdev_class_register(&mpic_sysclass); 1682 1683 while (mpic && !error) { 1684 mpic->sysdev.cls = &mpic_sysclass; 1685 mpic->sysdev.id = id++; 1686 error = sysdev_register(&mpic->sysdev); 1687 mpic = mpic->next; 1688 } 1689 return error; 1690 } 1691 1692 device_initcall(mpic_init_sys); 1693