1 /* 2 * arch/powerpc/kernel/mpic.c 3 * 4 * Driver for interrupt controllers following the OpenPIC standard, the 5 * common implementation being 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 * Copyright 2010-2012 Freescale Semiconductor, Inc. 10 * 11 * This file is subject to the terms and conditions of the GNU General Public 12 * License. See the file COPYING in the main directory of this archive 13 * for more details. 14 */ 15 16 #undef DEBUG 17 #undef DEBUG_IPI 18 #undef DEBUG_IRQ 19 #undef DEBUG_LOW 20 21 #include <linux/types.h> 22 #include <linux/kernel.h> 23 #include <linux/init.h> 24 #include <linux/irq.h> 25 #include <linux/smp.h> 26 #include <linux/interrupt.h> 27 #include <linux/spinlock.h> 28 #include <linux/pci.h> 29 #include <linux/slab.h> 30 #include <linux/syscore_ops.h> 31 #include <linux/ratelimit.h> 32 #include <linux/pgtable.h> 33 34 #include <asm/ptrace.h> 35 #include <asm/signal.h> 36 #include <asm/io.h> 37 #include <asm/irq.h> 38 #include <asm/machdep.h> 39 #include <asm/mpic.h> 40 #include <asm/smp.h> 41 42 #include "mpic.h" 43 44 #ifdef DEBUG 45 #define DBG(fmt...) printk(fmt) 46 #else 47 #define DBG(fmt...) 48 #endif 49 50 struct bus_type mpic_subsys = { 51 .name = "mpic", 52 .dev_name = "mpic", 53 }; 54 EXPORT_SYMBOL_GPL(mpic_subsys); 55 56 static struct mpic *mpics; 57 static struct mpic *mpic_primary; 58 static DEFINE_RAW_SPINLOCK(mpic_lock); 59 60 #ifdef CONFIG_PPC32 /* XXX for now */ 61 #ifdef CONFIG_IRQ_ALL_CPUS 62 #define distribute_irqs (1) 63 #else 64 #define distribute_irqs (0) 65 #endif 66 #endif 67 68 #ifdef CONFIG_MPIC_WEIRD 69 static u32 mpic_infos[][MPIC_IDX_END] = { 70 [0] = { /* Original OpenPIC compatible MPIC */ 71 MPIC_GREG_BASE, 72 MPIC_GREG_FEATURE_0, 73 MPIC_GREG_GLOBAL_CONF_0, 74 MPIC_GREG_VENDOR_ID, 75 MPIC_GREG_IPI_VECTOR_PRI_0, 76 MPIC_GREG_IPI_STRIDE, 77 MPIC_GREG_SPURIOUS, 78 MPIC_GREG_TIMER_FREQ, 79 80 MPIC_TIMER_BASE, 81 MPIC_TIMER_STRIDE, 82 MPIC_TIMER_CURRENT_CNT, 83 MPIC_TIMER_BASE_CNT, 84 MPIC_TIMER_VECTOR_PRI, 85 MPIC_TIMER_DESTINATION, 86 87 MPIC_CPU_BASE, 88 MPIC_CPU_STRIDE, 89 MPIC_CPU_IPI_DISPATCH_0, 90 MPIC_CPU_IPI_DISPATCH_STRIDE, 91 MPIC_CPU_CURRENT_TASK_PRI, 92 MPIC_CPU_WHOAMI, 93 MPIC_CPU_INTACK, 94 MPIC_CPU_EOI, 95 MPIC_CPU_MCACK, 96 97 MPIC_IRQ_BASE, 98 MPIC_IRQ_STRIDE, 99 MPIC_IRQ_VECTOR_PRI, 100 MPIC_VECPRI_VECTOR_MASK, 101 MPIC_VECPRI_POLARITY_POSITIVE, 102 MPIC_VECPRI_POLARITY_NEGATIVE, 103 MPIC_VECPRI_SENSE_LEVEL, 104 MPIC_VECPRI_SENSE_EDGE, 105 MPIC_VECPRI_POLARITY_MASK, 106 MPIC_VECPRI_SENSE_MASK, 107 MPIC_IRQ_DESTINATION 108 }, 109 [1] = { /* Tsi108/109 PIC */ 110 TSI108_GREG_BASE, 111 TSI108_GREG_FEATURE_0, 112 TSI108_GREG_GLOBAL_CONF_0, 113 TSI108_GREG_VENDOR_ID, 114 TSI108_GREG_IPI_VECTOR_PRI_0, 115 TSI108_GREG_IPI_STRIDE, 116 TSI108_GREG_SPURIOUS, 117 TSI108_GREG_TIMER_FREQ, 118 119 TSI108_TIMER_BASE, 120 TSI108_TIMER_STRIDE, 121 TSI108_TIMER_CURRENT_CNT, 122 TSI108_TIMER_BASE_CNT, 123 TSI108_TIMER_VECTOR_PRI, 124 TSI108_TIMER_DESTINATION, 125 126 TSI108_CPU_BASE, 127 TSI108_CPU_STRIDE, 128 TSI108_CPU_IPI_DISPATCH_0, 129 TSI108_CPU_IPI_DISPATCH_STRIDE, 130 TSI108_CPU_CURRENT_TASK_PRI, 131 TSI108_CPU_WHOAMI, 132 TSI108_CPU_INTACK, 133 TSI108_CPU_EOI, 134 TSI108_CPU_MCACK, 135 136 TSI108_IRQ_BASE, 137 TSI108_IRQ_STRIDE, 138 TSI108_IRQ_VECTOR_PRI, 139 TSI108_VECPRI_VECTOR_MASK, 140 TSI108_VECPRI_POLARITY_POSITIVE, 141 TSI108_VECPRI_POLARITY_NEGATIVE, 142 TSI108_VECPRI_SENSE_LEVEL, 143 TSI108_VECPRI_SENSE_EDGE, 144 TSI108_VECPRI_POLARITY_MASK, 145 TSI108_VECPRI_SENSE_MASK, 146 TSI108_IRQ_DESTINATION 147 }, 148 }; 149 150 #define MPIC_INFO(name) mpic->hw_set[MPIC_IDX_##name] 151 152 #else /* CONFIG_MPIC_WEIRD */ 153 154 #define MPIC_INFO(name) MPIC_##name 155 156 #endif /* CONFIG_MPIC_WEIRD */ 157 158 static inline unsigned int mpic_processor_id(struct mpic *mpic) 159 { 160 unsigned int cpu = 0; 161 162 if (!(mpic->flags & MPIC_SECONDARY)) 163 cpu = hard_smp_processor_id(); 164 165 return cpu; 166 } 167 168 /* 169 * Register accessor functions 170 */ 171 172 173 static inline u32 _mpic_read(enum mpic_reg_type type, 174 struct mpic_reg_bank *rb, 175 unsigned int reg) 176 { 177 switch(type) { 178 #ifdef CONFIG_PPC_DCR 179 case mpic_access_dcr: 180 return dcr_read(rb->dhost, reg); 181 #endif 182 case mpic_access_mmio_be: 183 return in_be32(rb->base + (reg >> 2)); 184 case mpic_access_mmio_le: 185 default: 186 return in_le32(rb->base + (reg >> 2)); 187 } 188 } 189 190 static inline void _mpic_write(enum mpic_reg_type type, 191 struct mpic_reg_bank *rb, 192 unsigned int reg, u32 value) 193 { 194 switch(type) { 195 #ifdef CONFIG_PPC_DCR 196 case mpic_access_dcr: 197 dcr_write(rb->dhost, reg, value); 198 break; 199 #endif 200 case mpic_access_mmio_be: 201 out_be32(rb->base + (reg >> 2), value); 202 break; 203 case mpic_access_mmio_le: 204 default: 205 out_le32(rb->base + (reg >> 2), value); 206 break; 207 } 208 } 209 210 static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi) 211 { 212 enum mpic_reg_type type = mpic->reg_type; 213 unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) + 214 (ipi * MPIC_INFO(GREG_IPI_STRIDE)); 215 216 if ((mpic->flags & MPIC_BROKEN_IPI) && type == mpic_access_mmio_le) 217 type = mpic_access_mmio_be; 218 return _mpic_read(type, &mpic->gregs, offset); 219 } 220 221 static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value) 222 { 223 unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) + 224 (ipi * MPIC_INFO(GREG_IPI_STRIDE)); 225 226 _mpic_write(mpic->reg_type, &mpic->gregs, offset, value); 227 } 228 229 static inline unsigned int mpic_tm_offset(struct mpic *mpic, unsigned int tm) 230 { 231 return (tm >> 2) * MPIC_TIMER_GROUP_STRIDE + 232 (tm & 3) * MPIC_INFO(TIMER_STRIDE); 233 } 234 235 static inline u32 _mpic_tm_read(struct mpic *mpic, unsigned int tm) 236 { 237 unsigned int offset = mpic_tm_offset(mpic, tm) + 238 MPIC_INFO(TIMER_VECTOR_PRI); 239 240 return _mpic_read(mpic->reg_type, &mpic->tmregs, offset); 241 } 242 243 static inline void _mpic_tm_write(struct mpic *mpic, unsigned int tm, u32 value) 244 { 245 unsigned int offset = mpic_tm_offset(mpic, tm) + 246 MPIC_INFO(TIMER_VECTOR_PRI); 247 248 _mpic_write(mpic->reg_type, &mpic->tmregs, offset, value); 249 } 250 251 static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg) 252 { 253 unsigned int cpu = mpic_processor_id(mpic); 254 255 return _mpic_read(mpic->reg_type, &mpic->cpuregs[cpu], reg); 256 } 257 258 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value) 259 { 260 unsigned int cpu = mpic_processor_id(mpic); 261 262 _mpic_write(mpic->reg_type, &mpic->cpuregs[cpu], reg, value); 263 } 264 265 static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg) 266 { 267 unsigned int isu = src_no >> mpic->isu_shift; 268 unsigned int idx = src_no & mpic->isu_mask; 269 unsigned int val; 270 271 val = _mpic_read(mpic->reg_type, &mpic->isus[isu], 272 reg + (idx * MPIC_INFO(IRQ_STRIDE))); 273 #ifdef CONFIG_MPIC_BROKEN_REGREAD 274 if (reg == 0) 275 val = (val & (MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY)) | 276 mpic->isu_reg0_shadow[src_no]; 277 #endif 278 return val; 279 } 280 281 static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no, 282 unsigned int reg, u32 value) 283 { 284 unsigned int isu = src_no >> mpic->isu_shift; 285 unsigned int idx = src_no & mpic->isu_mask; 286 287 _mpic_write(mpic->reg_type, &mpic->isus[isu], 288 reg + (idx * MPIC_INFO(IRQ_STRIDE)), value); 289 290 #ifdef CONFIG_MPIC_BROKEN_REGREAD 291 if (reg == 0) 292 mpic->isu_reg0_shadow[src_no] = 293 value & ~(MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY); 294 #endif 295 } 296 297 #define mpic_read(b,r) _mpic_read(mpic->reg_type,&(b),(r)) 298 #define mpic_write(b,r,v) _mpic_write(mpic->reg_type,&(b),(r),(v)) 299 #define mpic_ipi_read(i) _mpic_ipi_read(mpic,(i)) 300 #define mpic_ipi_write(i,v) _mpic_ipi_write(mpic,(i),(v)) 301 #define mpic_tm_read(i) _mpic_tm_read(mpic,(i)) 302 #define mpic_tm_write(i,v) _mpic_tm_write(mpic,(i),(v)) 303 #define mpic_cpu_read(i) _mpic_cpu_read(mpic,(i)) 304 #define mpic_cpu_write(i,v) _mpic_cpu_write(mpic,(i),(v)) 305 #define mpic_irq_read(s,r) _mpic_irq_read(mpic,(s),(r)) 306 #define mpic_irq_write(s,r,v) _mpic_irq_write(mpic,(s),(r),(v)) 307 308 309 /* 310 * Low level utility functions 311 */ 312 313 314 static void _mpic_map_mmio(struct mpic *mpic, phys_addr_t phys_addr, 315 struct mpic_reg_bank *rb, unsigned int offset, 316 unsigned int size) 317 { 318 rb->base = ioremap(phys_addr + offset, size); 319 BUG_ON(rb->base == NULL); 320 } 321 322 #ifdef CONFIG_PPC_DCR 323 static void _mpic_map_dcr(struct mpic *mpic, struct mpic_reg_bank *rb, 324 unsigned int offset, unsigned int size) 325 { 326 phys_addr_t phys_addr = dcr_resource_start(mpic->node, 0); 327 rb->dhost = dcr_map(mpic->node, phys_addr + offset, size); 328 BUG_ON(!DCR_MAP_OK(rb->dhost)); 329 } 330 331 static inline void mpic_map(struct mpic *mpic, 332 phys_addr_t phys_addr, struct mpic_reg_bank *rb, 333 unsigned int offset, unsigned int size) 334 { 335 if (mpic->flags & MPIC_USES_DCR) 336 _mpic_map_dcr(mpic, rb, offset, size); 337 else 338 _mpic_map_mmio(mpic, phys_addr, rb, offset, size); 339 } 340 #else /* CONFIG_PPC_DCR */ 341 #define mpic_map(m,p,b,o,s) _mpic_map_mmio(m,p,b,o,s) 342 #endif /* !CONFIG_PPC_DCR */ 343 344 345 346 /* Check if we have one of those nice broken MPICs with a flipped endian on 347 * reads from IPI registers 348 */ 349 static void __init mpic_test_broken_ipi(struct mpic *mpic) 350 { 351 u32 r; 352 353 mpic_write(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0), MPIC_VECPRI_MASK); 354 r = mpic_read(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0)); 355 356 if (r == le32_to_cpu(MPIC_VECPRI_MASK)) { 357 printk(KERN_INFO "mpic: Detected reversed IPI registers\n"); 358 mpic->flags |= MPIC_BROKEN_IPI; 359 } 360 } 361 362 #ifdef CONFIG_MPIC_U3_HT_IRQS 363 364 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s) 365 * to force the edge setting on the MPIC and do the ack workaround. 366 */ 367 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source) 368 { 369 if (source >= 128 || !mpic->fixups) 370 return 0; 371 return mpic->fixups[source].base != NULL; 372 } 373 374 375 static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source) 376 { 377 struct mpic_irq_fixup *fixup = &mpic->fixups[source]; 378 379 if (fixup->applebase) { 380 unsigned int soff = (fixup->index >> 3) & ~3; 381 unsigned int mask = 1U << (fixup->index & 0x1f); 382 writel(mask, fixup->applebase + soff); 383 } else { 384 raw_spin_lock(&mpic->fixup_lock); 385 writeb(0x11 + 2 * fixup->index, fixup->base + 2); 386 writel(fixup->data, fixup->base + 4); 387 raw_spin_unlock(&mpic->fixup_lock); 388 } 389 } 390 391 static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source, 392 bool level) 393 { 394 struct mpic_irq_fixup *fixup = &mpic->fixups[source]; 395 unsigned long flags; 396 u32 tmp; 397 398 if (fixup->base == NULL) 399 return; 400 401 DBG("startup_ht_interrupt(0x%x) index: %d\n", 402 source, fixup->index); 403 raw_spin_lock_irqsave(&mpic->fixup_lock, flags); 404 /* Enable and configure */ 405 writeb(0x10 + 2 * fixup->index, fixup->base + 2); 406 tmp = readl(fixup->base + 4); 407 tmp &= ~(0x23U); 408 if (level) 409 tmp |= 0x22; 410 writel(tmp, fixup->base + 4); 411 raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags); 412 413 #ifdef CONFIG_PM 414 /* use the lowest bit inverted to the actual HW, 415 * set if this fixup was enabled, clear otherwise */ 416 mpic->save_data[source].fixup_data = tmp | 1; 417 #endif 418 } 419 420 static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source) 421 { 422 struct mpic_irq_fixup *fixup = &mpic->fixups[source]; 423 unsigned long flags; 424 u32 tmp; 425 426 if (fixup->base == NULL) 427 return; 428 429 DBG("shutdown_ht_interrupt(0x%x)\n", source); 430 431 /* Disable */ 432 raw_spin_lock_irqsave(&mpic->fixup_lock, flags); 433 writeb(0x10 + 2 * fixup->index, fixup->base + 2); 434 tmp = readl(fixup->base + 4); 435 tmp |= 1; 436 writel(tmp, fixup->base + 4); 437 raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags); 438 439 #ifdef CONFIG_PM 440 /* use the lowest bit inverted to the actual HW, 441 * set if this fixup was enabled, clear otherwise */ 442 mpic->save_data[source].fixup_data = tmp & ~1; 443 #endif 444 } 445 446 #ifdef CONFIG_PCI_MSI 447 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase, 448 unsigned int devfn) 449 { 450 u8 __iomem *base; 451 u8 pos, flags; 452 u64 addr = 0; 453 454 for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0; 455 pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) { 456 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID); 457 if (id == PCI_CAP_ID_HT) { 458 id = readb(devbase + pos + 3); 459 if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_MSI_MAPPING) 460 break; 461 } 462 } 463 464 if (pos == 0) 465 return; 466 467 base = devbase + pos; 468 469 flags = readb(base + HT_MSI_FLAGS); 470 if (!(flags & HT_MSI_FLAGS_FIXED)) { 471 addr = readl(base + HT_MSI_ADDR_LO) & HT_MSI_ADDR_LO_MASK; 472 addr = addr | ((u64)readl(base + HT_MSI_ADDR_HI) << 32); 473 } 474 475 printk(KERN_DEBUG "mpic: - HT:%02x.%x %s MSI mapping found @ 0x%llx\n", 476 PCI_SLOT(devfn), PCI_FUNC(devfn), 477 flags & HT_MSI_FLAGS_ENABLE ? "enabled" : "disabled", addr); 478 479 if (!(flags & HT_MSI_FLAGS_ENABLE)) 480 writeb(flags | HT_MSI_FLAGS_ENABLE, base + HT_MSI_FLAGS); 481 } 482 #else 483 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase, 484 unsigned int devfn) 485 { 486 return; 487 } 488 #endif 489 490 static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase, 491 unsigned int devfn, u32 vdid) 492 { 493 int i, irq, n; 494 u8 __iomem *base; 495 u32 tmp; 496 u8 pos; 497 498 for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0; 499 pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) { 500 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID); 501 if (id == PCI_CAP_ID_HT) { 502 id = readb(devbase + pos + 3); 503 if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_IRQ) 504 break; 505 } 506 } 507 if (pos == 0) 508 return; 509 510 base = devbase + pos; 511 writeb(0x01, base + 2); 512 n = (readl(base + 4) >> 16) & 0xff; 513 514 printk(KERN_INFO "mpic: - HT:%02x.%x [0x%02x] vendor %04x device %04x" 515 " has %d irqs\n", 516 devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1); 517 518 for (i = 0; i <= n; i++) { 519 writeb(0x10 + 2 * i, base + 2); 520 tmp = readl(base + 4); 521 irq = (tmp >> 16) & 0xff; 522 DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp); 523 /* mask it , will be unmasked later */ 524 tmp |= 0x1; 525 writel(tmp, base + 4); 526 mpic->fixups[irq].index = i; 527 mpic->fixups[irq].base = base; 528 /* Apple HT PIC has a non-standard way of doing EOIs */ 529 if ((vdid & 0xffff) == 0x106b) 530 mpic->fixups[irq].applebase = devbase + 0x60; 531 else 532 mpic->fixups[irq].applebase = NULL; 533 writeb(0x11 + 2 * i, base + 2); 534 mpic->fixups[irq].data = readl(base + 4) | 0x80000000; 535 } 536 } 537 538 539 static void __init mpic_scan_ht_pics(struct mpic *mpic) 540 { 541 unsigned int devfn; 542 u8 __iomem *cfgspace; 543 544 printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n"); 545 546 /* Allocate fixups array */ 547 mpic->fixups = kcalloc(128, sizeof(*mpic->fixups), GFP_KERNEL); 548 BUG_ON(mpic->fixups == NULL); 549 550 /* Init spinlock */ 551 raw_spin_lock_init(&mpic->fixup_lock); 552 553 /* Map U3 config space. We assume all IO-APICs are on the primary bus 554 * so we only need to map 64kB. 555 */ 556 cfgspace = ioremap(0xf2000000, 0x10000); 557 BUG_ON(cfgspace == NULL); 558 559 /* Now we scan all slots. We do a very quick scan, we read the header 560 * type, vendor ID and device ID only, that's plenty enough 561 */ 562 for (devfn = 0; devfn < 0x100; devfn++) { 563 u8 __iomem *devbase = cfgspace + (devfn << 8); 564 u8 hdr_type = readb(devbase + PCI_HEADER_TYPE); 565 u32 l = readl(devbase + PCI_VENDOR_ID); 566 u16 s; 567 568 DBG("devfn %x, l: %x\n", devfn, l); 569 570 /* If no device, skip */ 571 if (l == 0xffffffff || l == 0x00000000 || 572 l == 0x0000ffff || l == 0xffff0000) 573 goto next; 574 /* Check if is supports capability lists */ 575 s = readw(devbase + PCI_STATUS); 576 if (!(s & PCI_STATUS_CAP_LIST)) 577 goto next; 578 579 mpic_scan_ht_pic(mpic, devbase, devfn, l); 580 mpic_scan_ht_msi(mpic, devbase, devfn); 581 582 next: 583 /* next device, if function 0 */ 584 if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0) 585 devfn += 7; 586 } 587 } 588 589 #else /* CONFIG_MPIC_U3_HT_IRQS */ 590 591 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source) 592 { 593 return 0; 594 } 595 596 static void __init mpic_scan_ht_pics(struct mpic *mpic) 597 { 598 } 599 600 #endif /* CONFIG_MPIC_U3_HT_IRQS */ 601 602 /* Find an mpic associated with a given linux interrupt */ 603 static struct mpic *mpic_find(unsigned int irq) 604 { 605 if (irq < NR_IRQS_LEGACY) 606 return NULL; 607 608 return irq_get_chip_data(irq); 609 } 610 611 /* Determine if the linux irq is an IPI */ 612 static unsigned int mpic_is_ipi(struct mpic *mpic, unsigned int src) 613 { 614 return (src >= mpic->ipi_vecs[0] && src <= mpic->ipi_vecs[3]); 615 } 616 617 /* Determine if the linux irq is a timer */ 618 static unsigned int mpic_is_tm(struct mpic *mpic, unsigned int src) 619 { 620 return (src >= mpic->timer_vecs[0] && src <= mpic->timer_vecs[7]); 621 } 622 623 /* Convert a cpu mask from logical to physical cpu numbers. */ 624 static inline u32 mpic_physmask(u32 cpumask) 625 { 626 int i; 627 u32 mask = 0; 628 629 for (i = 0; i < min(32, NR_CPUS) && cpu_possible(i); ++i, cpumask >>= 1) 630 mask |= (cpumask & 1) << get_hard_smp_processor_id(i); 631 return mask; 632 } 633 634 #ifdef CONFIG_SMP 635 /* Get the mpic structure from the IPI number */ 636 static inline struct mpic * mpic_from_ipi(struct irq_data *d) 637 { 638 return irq_data_get_irq_chip_data(d); 639 } 640 #endif 641 642 /* Get the mpic structure from the irq number */ 643 static inline struct mpic * mpic_from_irq(unsigned int irq) 644 { 645 return irq_get_chip_data(irq); 646 } 647 648 /* Get the mpic structure from the irq data */ 649 static inline struct mpic * mpic_from_irq_data(struct irq_data *d) 650 { 651 return irq_data_get_irq_chip_data(d); 652 } 653 654 /* Send an EOI */ 655 static inline void mpic_eoi(struct mpic *mpic) 656 { 657 mpic_cpu_write(MPIC_INFO(CPU_EOI), 0); 658 } 659 660 /* 661 * Linux descriptor level callbacks 662 */ 663 664 665 void mpic_unmask_irq(struct irq_data *d) 666 { 667 unsigned int loops = 100000; 668 struct mpic *mpic = mpic_from_irq_data(d); 669 unsigned int src = irqd_to_hwirq(d); 670 671 DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, d->irq, src); 672 673 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), 674 mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & 675 ~MPIC_VECPRI_MASK); 676 /* make sure mask gets to controller before we return to user */ 677 do { 678 if (!loops--) { 679 printk(KERN_ERR "%s: timeout on hwirq %u\n", 680 __func__, src); 681 break; 682 } 683 } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK); 684 } 685 686 void mpic_mask_irq(struct irq_data *d) 687 { 688 unsigned int loops = 100000; 689 struct mpic *mpic = mpic_from_irq_data(d); 690 unsigned int src = irqd_to_hwirq(d); 691 692 DBG("%s: disable_irq: %d (src %d)\n", mpic->name, d->irq, src); 693 694 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), 695 mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) | 696 MPIC_VECPRI_MASK); 697 698 /* make sure mask gets to controller before we return to user */ 699 do { 700 if (!loops--) { 701 printk(KERN_ERR "%s: timeout on hwirq %u\n", 702 __func__, src); 703 break; 704 } 705 } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK)); 706 } 707 708 void mpic_end_irq(struct irq_data *d) 709 { 710 struct mpic *mpic = mpic_from_irq_data(d); 711 712 #ifdef DEBUG_IRQ 713 DBG("%s: end_irq: %d\n", mpic->name, d->irq); 714 #endif 715 /* We always EOI on end_irq() even for edge interrupts since that 716 * should only lower the priority, the MPIC should have properly 717 * latched another edge interrupt coming in anyway 718 */ 719 720 mpic_eoi(mpic); 721 } 722 723 #ifdef CONFIG_MPIC_U3_HT_IRQS 724 725 static void mpic_unmask_ht_irq(struct irq_data *d) 726 { 727 struct mpic *mpic = mpic_from_irq_data(d); 728 unsigned int src = irqd_to_hwirq(d); 729 730 mpic_unmask_irq(d); 731 732 if (irqd_is_level_type(d)) 733 mpic_ht_end_irq(mpic, src); 734 } 735 736 static unsigned int mpic_startup_ht_irq(struct irq_data *d) 737 { 738 struct mpic *mpic = mpic_from_irq_data(d); 739 unsigned int src = irqd_to_hwirq(d); 740 741 mpic_unmask_irq(d); 742 mpic_startup_ht_interrupt(mpic, src, irqd_is_level_type(d)); 743 744 return 0; 745 } 746 747 static void mpic_shutdown_ht_irq(struct irq_data *d) 748 { 749 struct mpic *mpic = mpic_from_irq_data(d); 750 unsigned int src = irqd_to_hwirq(d); 751 752 mpic_shutdown_ht_interrupt(mpic, src); 753 mpic_mask_irq(d); 754 } 755 756 static void mpic_end_ht_irq(struct irq_data *d) 757 { 758 struct mpic *mpic = mpic_from_irq_data(d); 759 unsigned int src = irqd_to_hwirq(d); 760 761 #ifdef DEBUG_IRQ 762 DBG("%s: end_irq: %d\n", mpic->name, d->irq); 763 #endif 764 /* We always EOI on end_irq() even for edge interrupts since that 765 * should only lower the priority, the MPIC should have properly 766 * latched another edge interrupt coming in anyway 767 */ 768 769 if (irqd_is_level_type(d)) 770 mpic_ht_end_irq(mpic, src); 771 mpic_eoi(mpic); 772 } 773 #endif /* !CONFIG_MPIC_U3_HT_IRQS */ 774 775 #ifdef CONFIG_SMP 776 777 static void mpic_unmask_ipi(struct irq_data *d) 778 { 779 struct mpic *mpic = mpic_from_ipi(d); 780 unsigned int src = virq_to_hw(d->irq) - mpic->ipi_vecs[0]; 781 782 DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, d->irq, src); 783 mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK); 784 } 785 786 static void mpic_mask_ipi(struct irq_data *d) 787 { 788 /* NEVER disable an IPI... that's just plain wrong! */ 789 } 790 791 static void mpic_end_ipi(struct irq_data *d) 792 { 793 struct mpic *mpic = mpic_from_ipi(d); 794 795 /* 796 * IPIs are marked IRQ_PER_CPU. This has the side effect of 797 * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from 798 * applying to them. We EOI them late to avoid re-entering. 799 */ 800 mpic_eoi(mpic); 801 } 802 803 #endif /* CONFIG_SMP */ 804 805 static void mpic_unmask_tm(struct irq_data *d) 806 { 807 struct mpic *mpic = mpic_from_irq_data(d); 808 unsigned int src = virq_to_hw(d->irq) - mpic->timer_vecs[0]; 809 810 DBG("%s: enable_tm: %d (tm %d)\n", mpic->name, d->irq, src); 811 mpic_tm_write(src, mpic_tm_read(src) & ~MPIC_VECPRI_MASK); 812 mpic_tm_read(src); 813 } 814 815 static void mpic_mask_tm(struct irq_data *d) 816 { 817 struct mpic *mpic = mpic_from_irq_data(d); 818 unsigned int src = virq_to_hw(d->irq) - mpic->timer_vecs[0]; 819 820 mpic_tm_write(src, mpic_tm_read(src) | MPIC_VECPRI_MASK); 821 mpic_tm_read(src); 822 } 823 824 int mpic_set_affinity(struct irq_data *d, const struct cpumask *cpumask, 825 bool force) 826 { 827 struct mpic *mpic = mpic_from_irq_data(d); 828 unsigned int src = irqd_to_hwirq(d); 829 830 if (mpic->flags & MPIC_SINGLE_DEST_CPU) { 831 int cpuid = irq_choose_cpu(cpumask); 832 833 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid); 834 } else { 835 u32 mask = cpumask_bits(cpumask)[0]; 836 837 mask &= cpumask_bits(cpu_online_mask)[0]; 838 839 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 840 mpic_physmask(mask)); 841 } 842 843 return IRQ_SET_MASK_OK; 844 } 845 846 static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type) 847 { 848 /* Now convert sense value */ 849 switch(type & IRQ_TYPE_SENSE_MASK) { 850 case IRQ_TYPE_EDGE_RISING: 851 return MPIC_INFO(VECPRI_SENSE_EDGE) | 852 MPIC_INFO(VECPRI_POLARITY_POSITIVE); 853 case IRQ_TYPE_EDGE_FALLING: 854 case IRQ_TYPE_EDGE_BOTH: 855 return MPIC_INFO(VECPRI_SENSE_EDGE) | 856 MPIC_INFO(VECPRI_POLARITY_NEGATIVE); 857 case IRQ_TYPE_LEVEL_HIGH: 858 return MPIC_INFO(VECPRI_SENSE_LEVEL) | 859 MPIC_INFO(VECPRI_POLARITY_POSITIVE); 860 case IRQ_TYPE_LEVEL_LOW: 861 default: 862 return MPIC_INFO(VECPRI_SENSE_LEVEL) | 863 MPIC_INFO(VECPRI_POLARITY_NEGATIVE); 864 } 865 } 866 867 int mpic_set_irq_type(struct irq_data *d, unsigned int flow_type) 868 { 869 struct mpic *mpic = mpic_from_irq_data(d); 870 unsigned int src = irqd_to_hwirq(d); 871 unsigned int vecpri, vold, vnew; 872 873 DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n", 874 mpic, d->irq, src, flow_type); 875 876 if (src >= mpic->num_sources) 877 return -EINVAL; 878 879 vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)); 880 881 /* We don't support "none" type */ 882 if (flow_type == IRQ_TYPE_NONE) 883 flow_type = IRQ_TYPE_DEFAULT; 884 885 /* Default: read HW settings */ 886 if (flow_type == IRQ_TYPE_DEFAULT) { 887 int vold_ps; 888 889 vold_ps = vold & (MPIC_INFO(VECPRI_POLARITY_MASK) | 890 MPIC_INFO(VECPRI_SENSE_MASK)); 891 892 if (vold_ps == (MPIC_INFO(VECPRI_SENSE_EDGE) | 893 MPIC_INFO(VECPRI_POLARITY_POSITIVE))) 894 flow_type = IRQ_TYPE_EDGE_RISING; 895 else if (vold_ps == (MPIC_INFO(VECPRI_SENSE_EDGE) | 896 MPIC_INFO(VECPRI_POLARITY_NEGATIVE))) 897 flow_type = IRQ_TYPE_EDGE_FALLING; 898 else if (vold_ps == (MPIC_INFO(VECPRI_SENSE_LEVEL) | 899 MPIC_INFO(VECPRI_POLARITY_POSITIVE))) 900 flow_type = IRQ_TYPE_LEVEL_HIGH; 901 else if (vold_ps == (MPIC_INFO(VECPRI_SENSE_LEVEL) | 902 MPIC_INFO(VECPRI_POLARITY_NEGATIVE))) 903 flow_type = IRQ_TYPE_LEVEL_LOW; 904 else 905 WARN_ONCE(1, "mpic: unknown IRQ type %d\n", vold); 906 } 907 908 /* Apply to irq desc */ 909 irqd_set_trigger_type(d, flow_type); 910 911 /* Apply to HW */ 912 if (mpic_is_ht_interrupt(mpic, src)) 913 vecpri = MPIC_VECPRI_POLARITY_POSITIVE | 914 MPIC_VECPRI_SENSE_EDGE; 915 else 916 vecpri = mpic_type_to_vecpri(mpic, flow_type); 917 918 vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) | 919 MPIC_INFO(VECPRI_SENSE_MASK)); 920 vnew |= vecpri; 921 if (vold != vnew) 922 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew); 923 924 return IRQ_SET_MASK_OK_NOCOPY; 925 } 926 927 void mpic_set_vector(unsigned int virq, unsigned int vector) 928 { 929 struct mpic *mpic = mpic_from_irq(virq); 930 unsigned int src = virq_to_hw(virq); 931 unsigned int vecpri; 932 933 DBG("mpic: set_vector(mpic:@%p,virq:%d,src:%d,vector:0x%x)\n", 934 mpic, virq, src, vector); 935 936 if (src >= mpic->num_sources) 937 return; 938 939 vecpri = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)); 940 vecpri = vecpri & ~MPIC_INFO(VECPRI_VECTOR_MASK); 941 vecpri |= vector; 942 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vecpri); 943 } 944 945 static void mpic_set_destination(unsigned int virq, unsigned int cpuid) 946 { 947 struct mpic *mpic = mpic_from_irq(virq); 948 unsigned int src = virq_to_hw(virq); 949 950 DBG("mpic: set_destination(mpic:@%p,virq:%d,src:%d,cpuid:0x%x)\n", 951 mpic, virq, src, cpuid); 952 953 if (src >= mpic->num_sources) 954 return; 955 956 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid); 957 } 958 959 static struct irq_chip mpic_irq_chip = { 960 .irq_mask = mpic_mask_irq, 961 .irq_unmask = mpic_unmask_irq, 962 .irq_eoi = mpic_end_irq, 963 .irq_set_type = mpic_set_irq_type, 964 }; 965 966 #ifdef CONFIG_SMP 967 static const struct irq_chip mpic_ipi_chip = { 968 .irq_mask = mpic_mask_ipi, 969 .irq_unmask = mpic_unmask_ipi, 970 .irq_eoi = mpic_end_ipi, 971 }; 972 #endif /* CONFIG_SMP */ 973 974 static struct irq_chip mpic_tm_chip = { 975 .irq_mask = mpic_mask_tm, 976 .irq_unmask = mpic_unmask_tm, 977 .irq_eoi = mpic_end_irq, 978 }; 979 980 #ifdef CONFIG_MPIC_U3_HT_IRQS 981 static const struct irq_chip mpic_irq_ht_chip = { 982 .irq_startup = mpic_startup_ht_irq, 983 .irq_shutdown = mpic_shutdown_ht_irq, 984 .irq_mask = mpic_mask_irq, 985 .irq_unmask = mpic_unmask_ht_irq, 986 .irq_eoi = mpic_end_ht_irq, 987 .irq_set_type = mpic_set_irq_type, 988 }; 989 #endif /* CONFIG_MPIC_U3_HT_IRQS */ 990 991 992 static int mpic_host_match(struct irq_domain *h, struct device_node *node, 993 enum irq_domain_bus_token bus_token) 994 { 995 /* Exact match, unless mpic node is NULL */ 996 struct device_node *of_node = irq_domain_get_of_node(h); 997 return of_node == NULL || of_node == node; 998 } 999 1000 static int mpic_host_map(struct irq_domain *h, unsigned int virq, 1001 irq_hw_number_t hw) 1002 { 1003 struct mpic *mpic = h->host_data; 1004 struct irq_chip *chip; 1005 1006 DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw); 1007 1008 if (hw == mpic->spurious_vec) 1009 return -EINVAL; 1010 if (mpic->protected && test_bit(hw, mpic->protected)) { 1011 pr_warn("mpic: Mapping of source 0x%x failed, source protected by firmware !\n", 1012 (unsigned int)hw); 1013 return -EPERM; 1014 } 1015 1016 #ifdef CONFIG_SMP 1017 else if (hw >= mpic->ipi_vecs[0]) { 1018 WARN_ON(mpic->flags & MPIC_SECONDARY); 1019 1020 DBG("mpic: mapping as IPI\n"); 1021 irq_set_chip_data(virq, mpic); 1022 irq_set_chip_and_handler(virq, &mpic->hc_ipi, 1023 handle_percpu_irq); 1024 return 0; 1025 } 1026 #endif /* CONFIG_SMP */ 1027 1028 if (hw >= mpic->timer_vecs[0] && hw <= mpic->timer_vecs[7]) { 1029 WARN_ON(mpic->flags & MPIC_SECONDARY); 1030 1031 DBG("mpic: mapping as timer\n"); 1032 irq_set_chip_data(virq, mpic); 1033 irq_set_chip_and_handler(virq, &mpic->hc_tm, 1034 handle_fasteoi_irq); 1035 return 0; 1036 } 1037 1038 if (mpic_map_error_int(mpic, virq, hw)) 1039 return 0; 1040 1041 if (hw >= mpic->num_sources) { 1042 pr_warn("mpic: Mapping of source 0x%x failed, source out of range !\n", 1043 (unsigned int)hw); 1044 return -EINVAL; 1045 } 1046 1047 mpic_msi_reserve_hwirq(mpic, hw); 1048 1049 /* Default chip */ 1050 chip = &mpic->hc_irq; 1051 1052 #ifdef CONFIG_MPIC_U3_HT_IRQS 1053 /* Check for HT interrupts, override vecpri */ 1054 if (mpic_is_ht_interrupt(mpic, hw)) 1055 chip = &mpic->hc_ht_irq; 1056 #endif /* CONFIG_MPIC_U3_HT_IRQS */ 1057 1058 DBG("mpic: mapping to irq chip @%p\n", chip); 1059 1060 irq_set_chip_data(virq, mpic); 1061 irq_set_chip_and_handler(virq, chip, handle_fasteoi_irq); 1062 1063 /* Set default irq type */ 1064 irq_set_irq_type(virq, IRQ_TYPE_DEFAULT); 1065 1066 /* If the MPIC was reset, then all vectors have already been 1067 * initialized. Otherwise, a per source lazy initialization 1068 * is done here. 1069 */ 1070 if (!mpic_is_ipi(mpic, hw) && (mpic->flags & MPIC_NO_RESET)) { 1071 int cpu; 1072 1073 preempt_disable(); 1074 cpu = mpic_processor_id(mpic); 1075 preempt_enable(); 1076 1077 mpic_set_vector(virq, hw); 1078 mpic_set_destination(virq, cpu); 1079 mpic_irq_set_priority(virq, 8); 1080 } 1081 1082 return 0; 1083 } 1084 1085 static int mpic_host_xlate(struct irq_domain *h, struct device_node *ct, 1086 const u32 *intspec, unsigned int intsize, 1087 irq_hw_number_t *out_hwirq, unsigned int *out_flags) 1088 1089 { 1090 struct mpic *mpic = h->host_data; 1091 static unsigned char map_mpic_senses[4] = { 1092 IRQ_TYPE_EDGE_RISING, 1093 IRQ_TYPE_LEVEL_LOW, 1094 IRQ_TYPE_LEVEL_HIGH, 1095 IRQ_TYPE_EDGE_FALLING, 1096 }; 1097 1098 *out_hwirq = intspec[0]; 1099 if (intsize >= 4 && (mpic->flags & MPIC_FSL)) { 1100 /* 1101 * Freescale MPIC with extended intspec: 1102 * First two cells are as usual. Third specifies 1103 * an "interrupt type". Fourth is type-specific data. 1104 * 1105 * See Documentation/devicetree/bindings/powerpc/fsl/mpic.txt 1106 */ 1107 switch (intspec[2]) { 1108 case 0: 1109 break; 1110 case 1: 1111 if (!(mpic->flags & MPIC_FSL_HAS_EIMR)) 1112 break; 1113 1114 if (intspec[3] >= ARRAY_SIZE(mpic->err_int_vecs)) 1115 return -EINVAL; 1116 1117 *out_hwirq = mpic->err_int_vecs[intspec[3]]; 1118 1119 break; 1120 case 2: 1121 if (intspec[0] >= ARRAY_SIZE(mpic->ipi_vecs)) 1122 return -EINVAL; 1123 1124 *out_hwirq = mpic->ipi_vecs[intspec[0]]; 1125 break; 1126 case 3: 1127 if (intspec[0] >= ARRAY_SIZE(mpic->timer_vecs)) 1128 return -EINVAL; 1129 1130 *out_hwirq = mpic->timer_vecs[intspec[0]]; 1131 break; 1132 default: 1133 pr_debug("%s: unknown irq type %u\n", 1134 __func__, intspec[2]); 1135 return -EINVAL; 1136 } 1137 1138 *out_flags = map_mpic_senses[intspec[1] & 3]; 1139 } else if (intsize > 1) { 1140 u32 mask = 0x3; 1141 1142 /* Apple invented a new race of encoding on machines with 1143 * an HT APIC. They encode, among others, the index within 1144 * the HT APIC. We don't care about it here since thankfully, 1145 * it appears that they have the APIC already properly 1146 * configured, and thus our current fixup code that reads the 1147 * APIC config works fine. However, we still need to mask out 1148 * bits in the specifier to make sure we only get bit 0 which 1149 * is the level/edge bit (the only sense bit exposed by Apple), 1150 * as their bit 1 means something else. 1151 */ 1152 if (machine_is(powermac)) 1153 mask = 0x1; 1154 *out_flags = map_mpic_senses[intspec[1] & mask]; 1155 } else 1156 *out_flags = IRQ_TYPE_NONE; 1157 1158 DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n", 1159 intsize, intspec[0], intspec[1], *out_hwirq, *out_flags); 1160 1161 return 0; 1162 } 1163 1164 /* IRQ handler for a secondary MPIC cascaded from another IRQ controller */ 1165 static void mpic_cascade(struct irq_desc *desc) 1166 { 1167 struct irq_chip *chip = irq_desc_get_chip(desc); 1168 struct mpic *mpic = irq_desc_get_handler_data(desc); 1169 unsigned int virq; 1170 1171 BUG_ON(!(mpic->flags & MPIC_SECONDARY)); 1172 1173 virq = mpic_get_one_irq(mpic); 1174 if (virq) 1175 generic_handle_irq(virq); 1176 1177 chip->irq_eoi(&desc->irq_data); 1178 } 1179 1180 static const struct irq_domain_ops mpic_host_ops = { 1181 .match = mpic_host_match, 1182 .map = mpic_host_map, 1183 .xlate = mpic_host_xlate, 1184 }; 1185 1186 static u32 fsl_mpic_get_version(struct mpic *mpic) 1187 { 1188 u32 brr1; 1189 1190 if (!(mpic->flags & MPIC_FSL)) 1191 return 0; 1192 1193 brr1 = _mpic_read(mpic->reg_type, &mpic->thiscpuregs, 1194 MPIC_FSL_BRR1); 1195 1196 return brr1 & MPIC_FSL_BRR1_VER; 1197 } 1198 1199 /* 1200 * Exported functions 1201 */ 1202 1203 u32 fsl_mpic_primary_get_version(void) 1204 { 1205 struct mpic *mpic = mpic_primary; 1206 1207 if (mpic) 1208 return fsl_mpic_get_version(mpic); 1209 1210 return 0; 1211 } 1212 1213 struct mpic * __init mpic_alloc(struct device_node *node, 1214 phys_addr_t phys_addr, 1215 unsigned int flags, 1216 unsigned int isu_size, 1217 unsigned int irq_count, 1218 const char *name) 1219 { 1220 int i, psize, intvec_top; 1221 struct mpic *mpic; 1222 u32 greg_feature; 1223 const char *vers; 1224 const u32 *psrc; 1225 u32 last_irq; 1226 u32 fsl_version = 0; 1227 1228 /* Default MPIC search parameters */ 1229 static const struct of_device_id __initconst mpic_device_id[] = { 1230 { .type = "open-pic", }, 1231 { .compatible = "open-pic", }, 1232 {}, 1233 }; 1234 1235 /* 1236 * If we were not passed a device-tree node, then perform the default 1237 * search for standardized a standardized OpenPIC. 1238 */ 1239 if (node) { 1240 node = of_node_get(node); 1241 } else { 1242 node = of_find_matching_node(NULL, mpic_device_id); 1243 if (!node) 1244 return NULL; 1245 } 1246 1247 /* Pick the physical address from the device tree if unspecified */ 1248 if (!phys_addr) { 1249 /* Check if it is DCR-based */ 1250 if (of_property_read_bool(node, "dcr-reg")) { 1251 flags |= MPIC_USES_DCR; 1252 } else { 1253 struct resource r; 1254 if (of_address_to_resource(node, 0, &r)) 1255 goto err_of_node_put; 1256 phys_addr = r.start; 1257 } 1258 } 1259 1260 /* Read extra device-tree properties into the flags variable */ 1261 if (of_get_property(node, "big-endian", NULL)) 1262 flags |= MPIC_BIG_ENDIAN; 1263 if (of_get_property(node, "pic-no-reset", NULL)) 1264 flags |= MPIC_NO_RESET; 1265 if (of_get_property(node, "single-cpu-affinity", NULL)) 1266 flags |= MPIC_SINGLE_DEST_CPU; 1267 if (of_device_is_compatible(node, "fsl,mpic")) { 1268 flags |= MPIC_FSL | MPIC_LARGE_VECTORS; 1269 mpic_irq_chip.flags |= IRQCHIP_SKIP_SET_WAKE; 1270 mpic_tm_chip.flags |= IRQCHIP_SKIP_SET_WAKE; 1271 } 1272 1273 mpic = kzalloc(sizeof(struct mpic), GFP_KERNEL); 1274 if (mpic == NULL) 1275 goto err_of_node_put; 1276 1277 mpic->name = name; 1278 mpic->node = node; 1279 mpic->paddr = phys_addr; 1280 mpic->flags = flags; 1281 1282 mpic->hc_irq = mpic_irq_chip; 1283 mpic->hc_irq.name = name; 1284 if (!(mpic->flags & MPIC_SECONDARY)) 1285 mpic->hc_irq.irq_set_affinity = mpic_set_affinity; 1286 #ifdef CONFIG_MPIC_U3_HT_IRQS 1287 mpic->hc_ht_irq = mpic_irq_ht_chip; 1288 mpic->hc_ht_irq.name = name; 1289 if (!(mpic->flags & MPIC_SECONDARY)) 1290 mpic->hc_ht_irq.irq_set_affinity = mpic_set_affinity; 1291 #endif /* CONFIG_MPIC_U3_HT_IRQS */ 1292 1293 #ifdef CONFIG_SMP 1294 mpic->hc_ipi = mpic_ipi_chip; 1295 mpic->hc_ipi.name = name; 1296 #endif /* CONFIG_SMP */ 1297 1298 mpic->hc_tm = mpic_tm_chip; 1299 mpic->hc_tm.name = name; 1300 1301 mpic->num_sources = 0; /* so far */ 1302 1303 if (mpic->flags & MPIC_LARGE_VECTORS) 1304 intvec_top = 2047; 1305 else 1306 intvec_top = 255; 1307 1308 mpic->timer_vecs[0] = intvec_top - 12; 1309 mpic->timer_vecs[1] = intvec_top - 11; 1310 mpic->timer_vecs[2] = intvec_top - 10; 1311 mpic->timer_vecs[3] = intvec_top - 9; 1312 mpic->timer_vecs[4] = intvec_top - 8; 1313 mpic->timer_vecs[5] = intvec_top - 7; 1314 mpic->timer_vecs[6] = intvec_top - 6; 1315 mpic->timer_vecs[7] = intvec_top - 5; 1316 mpic->ipi_vecs[0] = intvec_top - 4; 1317 mpic->ipi_vecs[1] = intvec_top - 3; 1318 mpic->ipi_vecs[2] = intvec_top - 2; 1319 mpic->ipi_vecs[3] = intvec_top - 1; 1320 mpic->spurious_vec = intvec_top; 1321 1322 /* Look for protected sources */ 1323 psrc = of_get_property(mpic->node, "protected-sources", &psize); 1324 if (psrc) { 1325 /* Allocate a bitmap with one bit per interrupt */ 1326 mpic->protected = bitmap_zalloc(intvec_top + 1, GFP_KERNEL); 1327 BUG_ON(mpic->protected == NULL); 1328 for (i = 0; i < psize/sizeof(u32); i++) { 1329 if (psrc[i] > intvec_top) 1330 continue; 1331 __set_bit(psrc[i], mpic->protected); 1332 } 1333 } 1334 1335 #ifdef CONFIG_MPIC_WEIRD 1336 mpic->hw_set = mpic_infos[MPIC_GET_REGSET(mpic->flags)]; 1337 #endif 1338 1339 /* default register type */ 1340 if (mpic->flags & MPIC_BIG_ENDIAN) 1341 mpic->reg_type = mpic_access_mmio_be; 1342 else 1343 mpic->reg_type = mpic_access_mmio_le; 1344 1345 /* 1346 * An MPIC with a "dcr-reg" property must be accessed that way, but 1347 * only if the kernel includes DCR support. 1348 */ 1349 #ifdef CONFIG_PPC_DCR 1350 if (mpic->flags & MPIC_USES_DCR) 1351 mpic->reg_type = mpic_access_dcr; 1352 #else 1353 BUG_ON(mpic->flags & MPIC_USES_DCR); 1354 #endif 1355 1356 /* Map the global registers */ 1357 mpic_map(mpic, mpic->paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000); 1358 mpic_map(mpic, mpic->paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000); 1359 1360 if (mpic->flags & MPIC_FSL) { 1361 int ret; 1362 1363 /* 1364 * Yes, Freescale really did put global registers in the 1365 * magic per-cpu area -- and they don't even show up in the 1366 * non-magic per-cpu copies that this driver normally uses. 1367 */ 1368 mpic_map(mpic, mpic->paddr, &mpic->thiscpuregs, 1369 MPIC_CPU_THISBASE, 0x1000); 1370 1371 fsl_version = fsl_mpic_get_version(mpic); 1372 1373 /* Error interrupt mask register (EIMR) is required for 1374 * handling individual device error interrupts. EIMR 1375 * was added in MPIC version 4.1. 1376 * 1377 * Over here we reserve vector number space for error 1378 * interrupt vectors. This space is stolen from the 1379 * global vector number space, as in case of ipis 1380 * and timer interrupts. 1381 * 1382 * Available vector space = intvec_top - 13, where 13 1383 * is the number of vectors which have been consumed by 1384 * ipis, timer interrupts and spurious. 1385 */ 1386 if (fsl_version >= 0x401) { 1387 ret = mpic_setup_error_int(mpic, intvec_top - 13); 1388 if (ret) 1389 return NULL; 1390 } 1391 1392 } 1393 1394 /* 1395 * EPR is only available starting with v4.0. To support 1396 * platforms that don't know the MPIC version at compile-time, 1397 * such as qemu-e500, turn off coreint if this MPIC doesn't 1398 * support it. Note that we never enable it if it wasn't 1399 * requested in the first place. 1400 * 1401 * This is done outside the MPIC_FSL check, so that we 1402 * also disable coreint if the MPIC node doesn't have 1403 * an "fsl,mpic" compatible at all. This will be the case 1404 * with device trees generated by older versions of QEMU. 1405 * fsl_version will be zero if MPIC_FSL is not set. 1406 */ 1407 if (fsl_version < 0x400 && (flags & MPIC_ENABLE_COREINT)) 1408 ppc_md.get_irq = mpic_get_irq; 1409 1410 /* Reset */ 1411 1412 /* When using a device-node, reset requests are only honored if the MPIC 1413 * is allowed to reset. 1414 */ 1415 if (!(mpic->flags & MPIC_NO_RESET)) { 1416 printk(KERN_DEBUG "mpic: Resetting\n"); 1417 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0), 1418 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0)) 1419 | MPIC_GREG_GCONF_RESET); 1420 while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0)) 1421 & MPIC_GREG_GCONF_RESET) 1422 mb(); 1423 } 1424 1425 /* CoreInt */ 1426 if (mpic->flags & MPIC_ENABLE_COREINT) 1427 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0), 1428 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0)) 1429 | MPIC_GREG_GCONF_COREINT); 1430 1431 if (mpic->flags & MPIC_ENABLE_MCK) 1432 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0), 1433 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0)) 1434 | MPIC_GREG_GCONF_MCK); 1435 1436 /* 1437 * The MPIC driver will crash if there are more cores than we 1438 * can initialize, so we may as well catch that problem here. 1439 */ 1440 BUG_ON(num_possible_cpus() > MPIC_MAX_CPUS); 1441 1442 /* Map the per-CPU registers */ 1443 for_each_possible_cpu(i) { 1444 unsigned int cpu = get_hard_smp_processor_id(i); 1445 1446 mpic_map(mpic, mpic->paddr, &mpic->cpuregs[cpu], 1447 MPIC_INFO(CPU_BASE) + cpu * MPIC_INFO(CPU_STRIDE), 1448 0x1000); 1449 } 1450 1451 /* 1452 * Read feature register. For non-ISU MPICs, num sources as well. On 1453 * ISU MPICs, sources are counted as ISUs are added 1454 */ 1455 greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0)); 1456 1457 /* 1458 * By default, the last source number comes from the MPIC, but the 1459 * device-tree and board support code can override it on buggy hw. 1460 * If we get passed an isu_size (multi-isu MPIC) then we use that 1461 * as a default instead of the value read from the HW. 1462 */ 1463 last_irq = (greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK) 1464 >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT; 1465 if (isu_size) 1466 last_irq = isu_size * MPIC_MAX_ISU - 1; 1467 of_property_read_u32(mpic->node, "last-interrupt-source", &last_irq); 1468 if (irq_count) 1469 last_irq = irq_count - 1; 1470 1471 /* Initialize main ISU if none provided */ 1472 if (!isu_size) { 1473 isu_size = last_irq + 1; 1474 mpic->num_sources = isu_size; 1475 mpic_map(mpic, mpic->paddr, &mpic->isus[0], 1476 MPIC_INFO(IRQ_BASE), 1477 MPIC_INFO(IRQ_STRIDE) * isu_size); 1478 } 1479 1480 mpic->isu_size = isu_size; 1481 mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1); 1482 mpic->isu_mask = (1 << mpic->isu_shift) - 1; 1483 1484 mpic->irqhost = irq_domain_add_linear(mpic->node, 1485 intvec_top, 1486 &mpic_host_ops, mpic); 1487 1488 /* 1489 * FIXME: The code leaks the MPIC object and mappings here; this 1490 * is very unlikely to fail but it ought to be fixed anyways. 1491 */ 1492 if (mpic->irqhost == NULL) 1493 return NULL; 1494 1495 /* Display version */ 1496 switch (greg_feature & MPIC_GREG_FEATURE_VERSION_MASK) { 1497 case 1: 1498 vers = "1.0"; 1499 break; 1500 case 2: 1501 vers = "1.2"; 1502 break; 1503 case 3: 1504 vers = "1.3"; 1505 break; 1506 default: 1507 vers = "<unknown>"; 1508 break; 1509 } 1510 printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx," 1511 " max %d CPUs\n", 1512 name, vers, (unsigned long long)mpic->paddr, num_possible_cpus()); 1513 printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n", 1514 mpic->isu_size, mpic->isu_shift, mpic->isu_mask); 1515 1516 mpic->next = mpics; 1517 mpics = mpic; 1518 1519 if (!(mpic->flags & MPIC_SECONDARY)) { 1520 mpic_primary = mpic; 1521 irq_set_default_host(mpic->irqhost); 1522 } 1523 1524 return mpic; 1525 1526 err_of_node_put: 1527 of_node_put(node); 1528 return NULL; 1529 } 1530 1531 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num, 1532 phys_addr_t paddr) 1533 { 1534 unsigned int isu_first = isu_num * mpic->isu_size; 1535 1536 BUG_ON(isu_num >= MPIC_MAX_ISU); 1537 1538 mpic_map(mpic, 1539 paddr, &mpic->isus[isu_num], 0, 1540 MPIC_INFO(IRQ_STRIDE) * mpic->isu_size); 1541 1542 if ((isu_first + mpic->isu_size) > mpic->num_sources) 1543 mpic->num_sources = isu_first + mpic->isu_size; 1544 } 1545 1546 void __init mpic_init(struct mpic *mpic) 1547 { 1548 int i, cpu; 1549 int num_timers = 4; 1550 1551 BUG_ON(mpic->num_sources == 0); 1552 1553 printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources); 1554 1555 /* Set current processor priority to max */ 1556 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf); 1557 1558 if (mpic->flags & MPIC_FSL) { 1559 u32 version = fsl_mpic_get_version(mpic); 1560 1561 /* 1562 * Timer group B is present at the latest in MPIC 3.1 (e.g. 1563 * mpc8536). It is not present in MPIC 2.0 (e.g. mpc8544). 1564 * I don't know about the status of intermediate versions (or 1565 * whether they even exist). 1566 */ 1567 if (version >= 0x0301) 1568 num_timers = 8; 1569 } 1570 1571 /* Initialize timers to our reserved vectors and mask them for now */ 1572 for (i = 0; i < num_timers; i++) { 1573 unsigned int offset = mpic_tm_offset(mpic, i); 1574 1575 mpic_write(mpic->tmregs, 1576 offset + MPIC_INFO(TIMER_DESTINATION), 1577 1 << hard_smp_processor_id()); 1578 mpic_write(mpic->tmregs, 1579 offset + MPIC_INFO(TIMER_VECTOR_PRI), 1580 MPIC_VECPRI_MASK | 1581 (9 << MPIC_VECPRI_PRIORITY_SHIFT) | 1582 (mpic->timer_vecs[0] + i)); 1583 } 1584 1585 /* Initialize IPIs to our reserved vectors and mark them disabled for now */ 1586 mpic_test_broken_ipi(mpic); 1587 for (i = 0; i < 4; i++) { 1588 mpic_ipi_write(i, 1589 MPIC_VECPRI_MASK | 1590 (10 << MPIC_VECPRI_PRIORITY_SHIFT) | 1591 (mpic->ipi_vecs[0] + i)); 1592 } 1593 1594 /* Do the HT PIC fixups on U3 broken mpic */ 1595 DBG("MPIC flags: %x\n", mpic->flags); 1596 if ((mpic->flags & MPIC_U3_HT_IRQS) && !(mpic->flags & MPIC_SECONDARY)) { 1597 mpic_scan_ht_pics(mpic); 1598 mpic_u3msi_init(mpic); 1599 } 1600 1601 mpic_pasemi_msi_init(mpic); 1602 1603 cpu = mpic_processor_id(mpic); 1604 1605 if (!(mpic->flags & MPIC_NO_RESET)) { 1606 for (i = 0; i < mpic->num_sources; i++) { 1607 /* start with vector = source number, and masked */ 1608 u32 vecpri = MPIC_VECPRI_MASK | i | 1609 (8 << MPIC_VECPRI_PRIORITY_SHIFT); 1610 1611 /* check if protected */ 1612 if (mpic->protected && test_bit(i, mpic->protected)) 1613 continue; 1614 /* init hw */ 1615 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri); 1616 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1 << cpu); 1617 } 1618 } 1619 1620 /* Init spurious vector */ 1621 mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), mpic->spurious_vec); 1622 1623 /* Disable 8259 passthrough, if supported */ 1624 if (!(mpic->flags & MPIC_NO_PTHROU_DIS)) 1625 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0), 1626 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0)) 1627 | MPIC_GREG_GCONF_8259_PTHROU_DIS); 1628 1629 if (mpic->flags & MPIC_NO_BIAS) 1630 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0), 1631 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0)) 1632 | MPIC_GREG_GCONF_NO_BIAS); 1633 1634 /* Set current processor priority to 0 */ 1635 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0); 1636 1637 #ifdef CONFIG_PM 1638 /* allocate memory to save mpic state */ 1639 mpic->save_data = kmalloc_array(mpic->num_sources, 1640 sizeof(*mpic->save_data), 1641 GFP_KERNEL); 1642 BUG_ON(mpic->save_data == NULL); 1643 #endif 1644 1645 /* Check if this MPIC is chained from a parent interrupt controller */ 1646 if (mpic->flags & MPIC_SECONDARY) { 1647 int virq = irq_of_parse_and_map(mpic->node, 0); 1648 if (virq) { 1649 printk(KERN_INFO "%pOF: hooking up to IRQ %d\n", 1650 mpic->node, virq); 1651 irq_set_handler_data(virq, mpic); 1652 irq_set_chained_handler(virq, &mpic_cascade); 1653 } 1654 } 1655 1656 /* FSL mpic error interrupt initialization */ 1657 if (mpic->flags & MPIC_FSL_HAS_EIMR) 1658 mpic_err_int_init(mpic, MPIC_FSL_ERR_INT); 1659 } 1660 1661 void mpic_irq_set_priority(unsigned int irq, unsigned int pri) 1662 { 1663 struct mpic *mpic = mpic_find(irq); 1664 unsigned int src = virq_to_hw(irq); 1665 unsigned long flags; 1666 u32 reg; 1667 1668 if (!mpic) 1669 return; 1670 1671 raw_spin_lock_irqsave(&mpic_lock, flags); 1672 if (mpic_is_ipi(mpic, src)) { 1673 reg = mpic_ipi_read(src - mpic->ipi_vecs[0]) & 1674 ~MPIC_VECPRI_PRIORITY_MASK; 1675 mpic_ipi_write(src - mpic->ipi_vecs[0], 1676 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT)); 1677 } else if (mpic_is_tm(mpic, src)) { 1678 reg = mpic_tm_read(src - mpic->timer_vecs[0]) & 1679 ~MPIC_VECPRI_PRIORITY_MASK; 1680 mpic_tm_write(src - mpic->timer_vecs[0], 1681 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT)); 1682 } else { 1683 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) 1684 & ~MPIC_VECPRI_PRIORITY_MASK; 1685 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), 1686 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT)); 1687 } 1688 raw_spin_unlock_irqrestore(&mpic_lock, flags); 1689 } 1690 1691 void mpic_setup_this_cpu(void) 1692 { 1693 #ifdef CONFIG_SMP 1694 struct mpic *mpic = mpic_primary; 1695 unsigned long flags; 1696 u32 msk = 1 << hard_smp_processor_id(); 1697 unsigned int i; 1698 1699 BUG_ON(mpic == NULL); 1700 1701 DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id()); 1702 1703 raw_spin_lock_irqsave(&mpic_lock, flags); 1704 1705 /* let the mpic know we want intrs. default affinity is 0xffffffff 1706 * until changed via /proc. That's how it's done on x86. If we want 1707 * it differently, then we should make sure we also change the default 1708 * values of irq_desc[].affinity in irq.c. 1709 */ 1710 if (distribute_irqs && !(mpic->flags & MPIC_SINGLE_DEST_CPU)) { 1711 for (i = 0; i < mpic->num_sources ; i++) 1712 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1713 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk); 1714 } 1715 1716 /* Set current processor priority to 0 */ 1717 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0); 1718 1719 raw_spin_unlock_irqrestore(&mpic_lock, flags); 1720 #endif /* CONFIG_SMP */ 1721 } 1722 1723 int mpic_cpu_get_priority(void) 1724 { 1725 struct mpic *mpic = mpic_primary; 1726 1727 return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI)); 1728 } 1729 1730 void mpic_cpu_set_priority(int prio) 1731 { 1732 struct mpic *mpic = mpic_primary; 1733 1734 prio &= MPIC_CPU_TASKPRI_MASK; 1735 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio); 1736 } 1737 1738 void mpic_teardown_this_cpu(int secondary) 1739 { 1740 struct mpic *mpic = mpic_primary; 1741 unsigned long flags; 1742 u32 msk = 1 << hard_smp_processor_id(); 1743 unsigned int i; 1744 1745 BUG_ON(mpic == NULL); 1746 1747 DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id()); 1748 raw_spin_lock_irqsave(&mpic_lock, flags); 1749 1750 /* let the mpic know we don't want intrs. */ 1751 for (i = 0; i < mpic->num_sources ; i++) 1752 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1753 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk); 1754 1755 /* Set current processor priority to max */ 1756 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf); 1757 /* We need to EOI the IPI since not all platforms reset the MPIC 1758 * on boot and new interrupts wouldn't get delivered otherwise. 1759 */ 1760 mpic_eoi(mpic); 1761 1762 raw_spin_unlock_irqrestore(&mpic_lock, flags); 1763 } 1764 1765 1766 static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg) 1767 { 1768 u32 src; 1769 1770 src = mpic_cpu_read(reg) & MPIC_INFO(VECPRI_VECTOR_MASK); 1771 #ifdef DEBUG_LOW 1772 DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic->name, reg, src); 1773 #endif 1774 if (unlikely(src == mpic->spurious_vec)) { 1775 if (mpic->flags & MPIC_SPV_EOI) 1776 mpic_eoi(mpic); 1777 return 0; 1778 } 1779 if (unlikely(mpic->protected && test_bit(src, mpic->protected))) { 1780 printk_ratelimited(KERN_WARNING "%s: Got protected source %d !\n", 1781 mpic->name, (int)src); 1782 mpic_eoi(mpic); 1783 return 0; 1784 } 1785 1786 return irq_linear_revmap(mpic->irqhost, src); 1787 } 1788 1789 unsigned int mpic_get_one_irq(struct mpic *mpic) 1790 { 1791 return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK)); 1792 } 1793 1794 unsigned int mpic_get_irq(void) 1795 { 1796 struct mpic *mpic = mpic_primary; 1797 1798 BUG_ON(mpic == NULL); 1799 1800 return mpic_get_one_irq(mpic); 1801 } 1802 1803 unsigned int mpic_get_coreint_irq(void) 1804 { 1805 #ifdef CONFIG_BOOKE 1806 struct mpic *mpic = mpic_primary; 1807 u32 src; 1808 1809 BUG_ON(mpic == NULL); 1810 1811 src = mfspr(SPRN_EPR); 1812 1813 if (unlikely(src == mpic->spurious_vec)) { 1814 if (mpic->flags & MPIC_SPV_EOI) 1815 mpic_eoi(mpic); 1816 return 0; 1817 } 1818 if (unlikely(mpic->protected && test_bit(src, mpic->protected))) { 1819 printk_ratelimited(KERN_WARNING "%s: Got protected source %d !\n", 1820 mpic->name, (int)src); 1821 return 0; 1822 } 1823 1824 return irq_linear_revmap(mpic->irqhost, src); 1825 #else 1826 return 0; 1827 #endif 1828 } 1829 1830 unsigned int mpic_get_mcirq(void) 1831 { 1832 struct mpic *mpic = mpic_primary; 1833 1834 BUG_ON(mpic == NULL); 1835 1836 return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_MCACK)); 1837 } 1838 1839 #ifdef CONFIG_SMP 1840 void __init mpic_request_ipis(void) 1841 { 1842 struct mpic *mpic = mpic_primary; 1843 int i; 1844 BUG_ON(mpic == NULL); 1845 1846 printk(KERN_INFO "mpic: requesting IPIs...\n"); 1847 1848 for (i = 0; i < 4; i++) { 1849 unsigned int vipi = irq_create_mapping(mpic->irqhost, 1850 mpic->ipi_vecs[0] + i); 1851 if (!vipi) { 1852 printk(KERN_ERR "Failed to map %s\n", smp_ipi_name[i]); 1853 continue; 1854 } 1855 smp_request_message_ipi(vipi, i); 1856 } 1857 } 1858 1859 void smp_mpic_message_pass(int cpu, int msg) 1860 { 1861 struct mpic *mpic = mpic_primary; 1862 u32 physmask; 1863 1864 BUG_ON(mpic == NULL); 1865 1866 /* make sure we're sending something that translates to an IPI */ 1867 if ((unsigned int)msg > 3) { 1868 printk("SMP %d: smp_message_pass: unknown msg %d\n", 1869 smp_processor_id(), msg); 1870 return; 1871 } 1872 1873 #ifdef DEBUG_IPI 1874 DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, msg); 1875 #endif 1876 1877 physmask = 1 << get_hard_smp_processor_id(cpu); 1878 1879 mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) + 1880 msg * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE), physmask); 1881 } 1882 1883 void __init smp_mpic_probe(void) 1884 { 1885 int nr_cpus; 1886 1887 DBG("smp_mpic_probe()...\n"); 1888 1889 nr_cpus = num_possible_cpus(); 1890 1891 DBG("nr_cpus: %d\n", nr_cpus); 1892 1893 if (nr_cpus > 1) 1894 mpic_request_ipis(); 1895 } 1896 1897 void smp_mpic_setup_cpu(int cpu) 1898 { 1899 mpic_setup_this_cpu(); 1900 } 1901 1902 void mpic_reset_core(int cpu) 1903 { 1904 struct mpic *mpic = mpic_primary; 1905 u32 pir; 1906 int cpuid = get_hard_smp_processor_id(cpu); 1907 int i; 1908 1909 /* Set target bit for core reset */ 1910 pir = mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT)); 1911 pir |= (1 << cpuid); 1912 mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir); 1913 mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT)); 1914 1915 /* Restore target bit after reset complete */ 1916 pir &= ~(1 << cpuid); 1917 mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir); 1918 mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT)); 1919 1920 /* Perform 15 EOI on each reset core to clear pending interrupts. 1921 * This is required for FSL CoreNet based devices */ 1922 if (mpic->flags & MPIC_FSL) { 1923 for (i = 0; i < 15; i++) { 1924 _mpic_write(mpic->reg_type, &mpic->cpuregs[cpuid], 1925 MPIC_CPU_EOI, 0); 1926 } 1927 } 1928 } 1929 #endif /* CONFIG_SMP */ 1930 1931 #ifdef CONFIG_PM 1932 static void mpic_suspend_one(struct mpic *mpic) 1933 { 1934 int i; 1935 1936 for (i = 0; i < mpic->num_sources; i++) { 1937 mpic->save_data[i].vecprio = 1938 mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI)); 1939 mpic->save_data[i].dest = 1940 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)); 1941 } 1942 } 1943 1944 static int mpic_suspend(void) 1945 { 1946 struct mpic *mpic = mpics; 1947 1948 while (mpic) { 1949 mpic_suspend_one(mpic); 1950 mpic = mpic->next; 1951 } 1952 1953 return 0; 1954 } 1955 1956 static void mpic_resume_one(struct mpic *mpic) 1957 { 1958 int i; 1959 1960 for (i = 0; i < mpic->num_sources; i++) { 1961 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), 1962 mpic->save_data[i].vecprio); 1963 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1964 mpic->save_data[i].dest); 1965 1966 #ifdef CONFIG_MPIC_U3_HT_IRQS 1967 if (mpic->fixups) { 1968 struct mpic_irq_fixup *fixup = &mpic->fixups[i]; 1969 1970 if (fixup->base) { 1971 /* we use the lowest bit in an inverted meaning */ 1972 if ((mpic->save_data[i].fixup_data & 1) == 0) 1973 continue; 1974 1975 /* Enable and configure */ 1976 writeb(0x10 + 2 * fixup->index, fixup->base + 2); 1977 1978 writel(mpic->save_data[i].fixup_data & ~1, 1979 fixup->base + 4); 1980 } 1981 } 1982 #endif 1983 } /* end for loop */ 1984 } 1985 1986 static void mpic_resume(void) 1987 { 1988 struct mpic *mpic = mpics; 1989 1990 while (mpic) { 1991 mpic_resume_one(mpic); 1992 mpic = mpic->next; 1993 } 1994 } 1995 1996 static struct syscore_ops mpic_syscore_ops = { 1997 .resume = mpic_resume, 1998 .suspend = mpic_suspend, 1999 }; 2000 2001 static int mpic_init_sys(void) 2002 { 2003 int rc; 2004 2005 register_syscore_ops(&mpic_syscore_ops); 2006 rc = subsys_system_register(&mpic_subsys, NULL); 2007 if (rc) { 2008 unregister_syscore_ops(&mpic_syscore_ops); 2009 pr_err("mpic: Failed to register subsystem!\n"); 2010 return rc; 2011 } 2012 2013 return 0; 2014 } 2015 2016 device_initcall(mpic_init_sys); 2017 #endif 2018