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 #include <linux/of_address.h> 34 #include <linux/of_irq.h> 35 36 #include <asm/ptrace.h> 37 #include <asm/signal.h> 38 #include <asm/io.h> 39 #include <asm/irq.h> 40 #include <asm/machdep.h> 41 #include <asm/mpic.h> 42 #include <asm/smp.h> 43 44 #include "mpic.h" 45 46 #ifdef DEBUG 47 #define DBG(fmt...) printk(fmt) 48 #else 49 #define DBG(fmt...) 50 #endif 51 52 struct bus_type mpic_subsys = { 53 .name = "mpic", 54 .dev_name = "mpic", 55 }; 56 EXPORT_SYMBOL_GPL(mpic_subsys); 57 58 static struct mpic *mpics; 59 static struct mpic *mpic_primary; 60 static DEFINE_RAW_SPINLOCK(mpic_lock); 61 62 #ifdef CONFIG_PPC32 /* XXX for now */ 63 #ifdef CONFIG_IRQ_ALL_CPUS 64 #define distribute_irqs (1) 65 #else 66 #define distribute_irqs (0) 67 #endif 68 #endif 69 70 #ifdef CONFIG_MPIC_WEIRD 71 static u32 mpic_infos[][MPIC_IDX_END] = { 72 [0] = { /* Original OpenPIC compatible MPIC */ 73 MPIC_GREG_BASE, 74 MPIC_GREG_FEATURE_0, 75 MPIC_GREG_GLOBAL_CONF_0, 76 MPIC_GREG_VENDOR_ID, 77 MPIC_GREG_IPI_VECTOR_PRI_0, 78 MPIC_GREG_IPI_STRIDE, 79 MPIC_GREG_SPURIOUS, 80 MPIC_GREG_TIMER_FREQ, 81 82 MPIC_TIMER_BASE, 83 MPIC_TIMER_STRIDE, 84 MPIC_TIMER_CURRENT_CNT, 85 MPIC_TIMER_BASE_CNT, 86 MPIC_TIMER_VECTOR_PRI, 87 MPIC_TIMER_DESTINATION, 88 89 MPIC_CPU_BASE, 90 MPIC_CPU_STRIDE, 91 MPIC_CPU_IPI_DISPATCH_0, 92 MPIC_CPU_IPI_DISPATCH_STRIDE, 93 MPIC_CPU_CURRENT_TASK_PRI, 94 MPIC_CPU_WHOAMI, 95 MPIC_CPU_INTACK, 96 MPIC_CPU_EOI, 97 MPIC_CPU_MCACK, 98 99 MPIC_IRQ_BASE, 100 MPIC_IRQ_STRIDE, 101 MPIC_IRQ_VECTOR_PRI, 102 MPIC_VECPRI_VECTOR_MASK, 103 MPIC_VECPRI_POLARITY_POSITIVE, 104 MPIC_VECPRI_POLARITY_NEGATIVE, 105 MPIC_VECPRI_SENSE_LEVEL, 106 MPIC_VECPRI_SENSE_EDGE, 107 MPIC_VECPRI_POLARITY_MASK, 108 MPIC_VECPRI_SENSE_MASK, 109 MPIC_IRQ_DESTINATION 110 }, 111 [1] = { /* Tsi108/109 PIC */ 112 TSI108_GREG_BASE, 113 TSI108_GREG_FEATURE_0, 114 TSI108_GREG_GLOBAL_CONF_0, 115 TSI108_GREG_VENDOR_ID, 116 TSI108_GREG_IPI_VECTOR_PRI_0, 117 TSI108_GREG_IPI_STRIDE, 118 TSI108_GREG_SPURIOUS, 119 TSI108_GREG_TIMER_FREQ, 120 121 TSI108_TIMER_BASE, 122 TSI108_TIMER_STRIDE, 123 TSI108_TIMER_CURRENT_CNT, 124 TSI108_TIMER_BASE_CNT, 125 TSI108_TIMER_VECTOR_PRI, 126 TSI108_TIMER_DESTINATION, 127 128 TSI108_CPU_BASE, 129 TSI108_CPU_STRIDE, 130 TSI108_CPU_IPI_DISPATCH_0, 131 TSI108_CPU_IPI_DISPATCH_STRIDE, 132 TSI108_CPU_CURRENT_TASK_PRI, 133 TSI108_CPU_WHOAMI, 134 TSI108_CPU_INTACK, 135 TSI108_CPU_EOI, 136 TSI108_CPU_MCACK, 137 138 TSI108_IRQ_BASE, 139 TSI108_IRQ_STRIDE, 140 TSI108_IRQ_VECTOR_PRI, 141 TSI108_VECPRI_VECTOR_MASK, 142 TSI108_VECPRI_POLARITY_POSITIVE, 143 TSI108_VECPRI_POLARITY_NEGATIVE, 144 TSI108_VECPRI_SENSE_LEVEL, 145 TSI108_VECPRI_SENSE_EDGE, 146 TSI108_VECPRI_POLARITY_MASK, 147 TSI108_VECPRI_SENSE_MASK, 148 TSI108_IRQ_DESTINATION 149 }, 150 }; 151 152 #define MPIC_INFO(name) mpic->hw_set[MPIC_IDX_##name] 153 154 #else /* CONFIG_MPIC_WEIRD */ 155 156 #define MPIC_INFO(name) MPIC_##name 157 158 #endif /* CONFIG_MPIC_WEIRD */ 159 160 static inline unsigned int mpic_processor_id(struct mpic *mpic) 161 { 162 unsigned int cpu = 0; 163 164 if (!(mpic->flags & MPIC_SECONDARY)) 165 cpu = hard_smp_processor_id(); 166 167 return cpu; 168 } 169 170 /* 171 * Register accessor functions 172 */ 173 174 175 static inline u32 _mpic_read(enum mpic_reg_type type, 176 struct mpic_reg_bank *rb, 177 unsigned int reg) 178 { 179 switch(type) { 180 #ifdef CONFIG_PPC_DCR 181 case mpic_access_dcr: 182 return dcr_read(rb->dhost, reg); 183 #endif 184 case mpic_access_mmio_be: 185 return in_be32(rb->base + (reg >> 2)); 186 case mpic_access_mmio_le: 187 default: 188 return in_le32(rb->base + (reg >> 2)); 189 } 190 } 191 192 static inline void _mpic_write(enum mpic_reg_type type, 193 struct mpic_reg_bank *rb, 194 unsigned int reg, u32 value) 195 { 196 switch(type) { 197 #ifdef CONFIG_PPC_DCR 198 case mpic_access_dcr: 199 dcr_write(rb->dhost, reg, value); 200 break; 201 #endif 202 case mpic_access_mmio_be: 203 out_be32(rb->base + (reg >> 2), value); 204 break; 205 case mpic_access_mmio_le: 206 default: 207 out_le32(rb->base + (reg >> 2), value); 208 break; 209 } 210 } 211 212 static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi) 213 { 214 enum mpic_reg_type type = mpic->reg_type; 215 unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) + 216 (ipi * MPIC_INFO(GREG_IPI_STRIDE)); 217 218 if ((mpic->flags & MPIC_BROKEN_IPI) && type == mpic_access_mmio_le) 219 type = mpic_access_mmio_be; 220 return _mpic_read(type, &mpic->gregs, offset); 221 } 222 223 static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value) 224 { 225 unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) + 226 (ipi * MPIC_INFO(GREG_IPI_STRIDE)); 227 228 _mpic_write(mpic->reg_type, &mpic->gregs, offset, value); 229 } 230 231 static inline unsigned int mpic_tm_offset(struct mpic *mpic, unsigned int tm) 232 { 233 return (tm >> 2) * MPIC_TIMER_GROUP_STRIDE + 234 (tm & 3) * MPIC_INFO(TIMER_STRIDE); 235 } 236 237 static inline u32 _mpic_tm_read(struct mpic *mpic, unsigned int tm) 238 { 239 unsigned int offset = mpic_tm_offset(mpic, tm) + 240 MPIC_INFO(TIMER_VECTOR_PRI); 241 242 return _mpic_read(mpic->reg_type, &mpic->tmregs, offset); 243 } 244 245 static inline void _mpic_tm_write(struct mpic *mpic, unsigned int tm, u32 value) 246 { 247 unsigned int offset = mpic_tm_offset(mpic, tm) + 248 MPIC_INFO(TIMER_VECTOR_PRI); 249 250 _mpic_write(mpic->reg_type, &mpic->tmregs, offset, value); 251 } 252 253 static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg) 254 { 255 unsigned int cpu = mpic_processor_id(mpic); 256 257 return _mpic_read(mpic->reg_type, &mpic->cpuregs[cpu], reg); 258 } 259 260 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value) 261 { 262 unsigned int cpu = mpic_processor_id(mpic); 263 264 _mpic_write(mpic->reg_type, &mpic->cpuregs[cpu], reg, value); 265 } 266 267 static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg) 268 { 269 unsigned int isu = src_no >> mpic->isu_shift; 270 unsigned int idx = src_no & mpic->isu_mask; 271 unsigned int val; 272 273 val = _mpic_read(mpic->reg_type, &mpic->isus[isu], 274 reg + (idx * MPIC_INFO(IRQ_STRIDE))); 275 #ifdef CONFIG_MPIC_BROKEN_REGREAD 276 if (reg == 0) 277 val = (val & (MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY)) | 278 mpic->isu_reg0_shadow[src_no]; 279 #endif 280 return val; 281 } 282 283 static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no, 284 unsigned int reg, u32 value) 285 { 286 unsigned int isu = src_no >> mpic->isu_shift; 287 unsigned int idx = src_no & mpic->isu_mask; 288 289 _mpic_write(mpic->reg_type, &mpic->isus[isu], 290 reg + (idx * MPIC_INFO(IRQ_STRIDE)), value); 291 292 #ifdef CONFIG_MPIC_BROKEN_REGREAD 293 if (reg == 0) 294 mpic->isu_reg0_shadow[src_no] = 295 value & ~(MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY); 296 #endif 297 } 298 299 #define mpic_read(b,r) _mpic_read(mpic->reg_type,&(b),(r)) 300 #define mpic_write(b,r,v) _mpic_write(mpic->reg_type,&(b),(r),(v)) 301 #define mpic_ipi_read(i) _mpic_ipi_read(mpic,(i)) 302 #define mpic_ipi_write(i,v) _mpic_ipi_write(mpic,(i),(v)) 303 #define mpic_tm_read(i) _mpic_tm_read(mpic,(i)) 304 #define mpic_tm_write(i,v) _mpic_tm_write(mpic,(i),(v)) 305 #define mpic_cpu_read(i) _mpic_cpu_read(mpic,(i)) 306 #define mpic_cpu_write(i,v) _mpic_cpu_write(mpic,(i),(v)) 307 #define mpic_irq_read(s,r) _mpic_irq_read(mpic,(s),(r)) 308 #define mpic_irq_write(s,r,v) _mpic_irq_write(mpic,(s),(r),(v)) 309 310 311 /* 312 * Low level utility functions 313 */ 314 315 316 static void _mpic_map_mmio(struct mpic *mpic, phys_addr_t phys_addr, 317 struct mpic_reg_bank *rb, unsigned int offset, 318 unsigned int size) 319 { 320 rb->base = ioremap(phys_addr + offset, size); 321 BUG_ON(rb->base == NULL); 322 } 323 324 #ifdef CONFIG_PPC_DCR 325 static void _mpic_map_dcr(struct mpic *mpic, struct mpic_reg_bank *rb, 326 unsigned int offset, unsigned int size) 327 { 328 phys_addr_t phys_addr = dcr_resource_start(mpic->node, 0); 329 rb->dhost = dcr_map(mpic->node, phys_addr + offset, size); 330 BUG_ON(!DCR_MAP_OK(rb->dhost)); 331 } 332 333 static inline void mpic_map(struct mpic *mpic, 334 phys_addr_t phys_addr, struct mpic_reg_bank *rb, 335 unsigned int offset, unsigned int size) 336 { 337 if (mpic->flags & MPIC_USES_DCR) 338 _mpic_map_dcr(mpic, rb, offset, size); 339 else 340 _mpic_map_mmio(mpic, phys_addr, rb, offset, size); 341 } 342 #else /* CONFIG_PPC_DCR */ 343 #define mpic_map(m,p,b,o,s) _mpic_map_mmio(m,p,b,o,s) 344 #endif /* !CONFIG_PPC_DCR */ 345 346 347 348 /* Check if we have one of those nice broken MPICs with a flipped endian on 349 * reads from IPI registers 350 */ 351 static void __init mpic_test_broken_ipi(struct mpic *mpic) 352 { 353 u32 r; 354 355 mpic_write(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0), MPIC_VECPRI_MASK); 356 r = mpic_read(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0)); 357 358 if (r == le32_to_cpu(MPIC_VECPRI_MASK)) { 359 printk(KERN_INFO "mpic: Detected reversed IPI registers\n"); 360 mpic->flags |= MPIC_BROKEN_IPI; 361 } 362 } 363 364 #ifdef CONFIG_MPIC_U3_HT_IRQS 365 366 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s) 367 * to force the edge setting on the MPIC and do the ack workaround. 368 */ 369 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source) 370 { 371 if (source >= 128 || !mpic->fixups) 372 return 0; 373 return mpic->fixups[source].base != NULL; 374 } 375 376 377 static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source) 378 { 379 struct mpic_irq_fixup *fixup = &mpic->fixups[source]; 380 381 if (fixup->applebase) { 382 unsigned int soff = (fixup->index >> 3) & ~3; 383 unsigned int mask = 1U << (fixup->index & 0x1f); 384 writel(mask, fixup->applebase + soff); 385 } else { 386 raw_spin_lock(&mpic->fixup_lock); 387 writeb(0x11 + 2 * fixup->index, fixup->base + 2); 388 writel(fixup->data, fixup->base + 4); 389 raw_spin_unlock(&mpic->fixup_lock); 390 } 391 } 392 393 static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source, 394 bool level) 395 { 396 struct mpic_irq_fixup *fixup = &mpic->fixups[source]; 397 unsigned long flags; 398 u32 tmp; 399 400 if (fixup->base == NULL) 401 return; 402 403 DBG("startup_ht_interrupt(0x%x) index: %d\n", 404 source, fixup->index); 405 raw_spin_lock_irqsave(&mpic->fixup_lock, flags); 406 /* Enable and configure */ 407 writeb(0x10 + 2 * fixup->index, fixup->base + 2); 408 tmp = readl(fixup->base + 4); 409 tmp &= ~(0x23U); 410 if (level) 411 tmp |= 0x22; 412 writel(tmp, fixup->base + 4); 413 raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags); 414 415 #ifdef CONFIG_PM 416 /* use the lowest bit inverted to the actual HW, 417 * set if this fixup was enabled, clear otherwise */ 418 mpic->save_data[source].fixup_data = tmp | 1; 419 #endif 420 } 421 422 static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source) 423 { 424 struct mpic_irq_fixup *fixup = &mpic->fixups[source]; 425 unsigned long flags; 426 u32 tmp; 427 428 if (fixup->base == NULL) 429 return; 430 431 DBG("shutdown_ht_interrupt(0x%x)\n", source); 432 433 /* Disable */ 434 raw_spin_lock_irqsave(&mpic->fixup_lock, flags); 435 writeb(0x10 + 2 * fixup->index, fixup->base + 2); 436 tmp = readl(fixup->base + 4); 437 tmp |= 1; 438 writel(tmp, fixup->base + 4); 439 raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags); 440 441 #ifdef CONFIG_PM 442 /* use the lowest bit inverted to the actual HW, 443 * set if this fixup was enabled, clear otherwise */ 444 mpic->save_data[source].fixup_data = tmp & ~1; 445 #endif 446 } 447 448 #ifdef CONFIG_PCI_MSI 449 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase, 450 unsigned int devfn) 451 { 452 u8 __iomem *base; 453 u8 pos, flags; 454 u64 addr = 0; 455 456 for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0; 457 pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) { 458 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID); 459 if (id == PCI_CAP_ID_HT) { 460 id = readb(devbase + pos + 3); 461 if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_MSI_MAPPING) 462 break; 463 } 464 } 465 466 if (pos == 0) 467 return; 468 469 base = devbase + pos; 470 471 flags = readb(base + HT_MSI_FLAGS); 472 if (!(flags & HT_MSI_FLAGS_FIXED)) { 473 addr = readl(base + HT_MSI_ADDR_LO) & HT_MSI_ADDR_LO_MASK; 474 addr = addr | ((u64)readl(base + HT_MSI_ADDR_HI) << 32); 475 } 476 477 printk(KERN_DEBUG "mpic: - HT:%02x.%x %s MSI mapping found @ 0x%llx\n", 478 PCI_SLOT(devfn), PCI_FUNC(devfn), 479 flags & HT_MSI_FLAGS_ENABLE ? "enabled" : "disabled", addr); 480 481 if (!(flags & HT_MSI_FLAGS_ENABLE)) 482 writeb(flags | HT_MSI_FLAGS_ENABLE, base + HT_MSI_FLAGS); 483 } 484 #else 485 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase, 486 unsigned int devfn) 487 { 488 return; 489 } 490 #endif 491 492 static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase, 493 unsigned int devfn, u32 vdid) 494 { 495 int i, irq, n; 496 u8 __iomem *base; 497 u32 tmp; 498 u8 pos; 499 500 for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0; 501 pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) { 502 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID); 503 if (id == PCI_CAP_ID_HT) { 504 id = readb(devbase + pos + 3); 505 if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_IRQ) 506 break; 507 } 508 } 509 if (pos == 0) 510 return; 511 512 base = devbase + pos; 513 writeb(0x01, base + 2); 514 n = (readl(base + 4) >> 16) & 0xff; 515 516 printk(KERN_INFO "mpic: - HT:%02x.%x [0x%02x] vendor %04x device %04x" 517 " has %d irqs\n", 518 devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1); 519 520 for (i = 0; i <= n; i++) { 521 writeb(0x10 + 2 * i, base + 2); 522 tmp = readl(base + 4); 523 irq = (tmp >> 16) & 0xff; 524 DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp); 525 /* mask it , will be unmasked later */ 526 tmp |= 0x1; 527 writel(tmp, base + 4); 528 mpic->fixups[irq].index = i; 529 mpic->fixups[irq].base = base; 530 /* Apple HT PIC has a non-standard way of doing EOIs */ 531 if ((vdid & 0xffff) == 0x106b) 532 mpic->fixups[irq].applebase = devbase + 0x60; 533 else 534 mpic->fixups[irq].applebase = NULL; 535 writeb(0x11 + 2 * i, base + 2); 536 mpic->fixups[irq].data = readl(base + 4) | 0x80000000; 537 } 538 } 539 540 541 static void __init mpic_scan_ht_pics(struct mpic *mpic) 542 { 543 unsigned int devfn; 544 u8 __iomem *cfgspace; 545 546 printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n"); 547 548 /* Allocate fixups array */ 549 mpic->fixups = kcalloc(128, sizeof(*mpic->fixups), GFP_KERNEL); 550 BUG_ON(mpic->fixups == NULL); 551 552 /* Init spinlock */ 553 raw_spin_lock_init(&mpic->fixup_lock); 554 555 /* Map U3 config space. We assume all IO-APICs are on the primary bus 556 * so we only need to map 64kB. 557 */ 558 cfgspace = ioremap(0xf2000000, 0x10000); 559 BUG_ON(cfgspace == NULL); 560 561 /* Now we scan all slots. We do a very quick scan, we read the header 562 * type, vendor ID and device ID only, that's plenty enough 563 */ 564 for (devfn = 0; devfn < 0x100; devfn++) { 565 u8 __iomem *devbase = cfgspace + (devfn << 8); 566 u8 hdr_type = readb(devbase + PCI_HEADER_TYPE); 567 u32 l = readl(devbase + PCI_VENDOR_ID); 568 u16 s; 569 570 DBG("devfn %x, l: %x\n", devfn, l); 571 572 /* If no device, skip */ 573 if (l == 0xffffffff || l == 0x00000000 || 574 l == 0x0000ffff || l == 0xffff0000) 575 goto next; 576 /* Check if is supports capability lists */ 577 s = readw(devbase + PCI_STATUS); 578 if (!(s & PCI_STATUS_CAP_LIST)) 579 goto next; 580 581 mpic_scan_ht_pic(mpic, devbase, devfn, l); 582 mpic_scan_ht_msi(mpic, devbase, devfn); 583 584 next: 585 /* next device, if function 0 */ 586 if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0) 587 devfn += 7; 588 } 589 } 590 591 #else /* CONFIG_MPIC_U3_HT_IRQS */ 592 593 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source) 594 { 595 return 0; 596 } 597 598 static void __init mpic_scan_ht_pics(struct mpic *mpic) 599 { 600 } 601 602 #endif /* CONFIG_MPIC_U3_HT_IRQS */ 603 604 /* Find an mpic associated with a given linux interrupt */ 605 static struct mpic *mpic_find(unsigned int irq) 606 { 607 if (irq < NR_IRQS_LEGACY) 608 return NULL; 609 610 return irq_get_chip_data(irq); 611 } 612 613 /* Determine if the linux irq is an IPI */ 614 static unsigned int mpic_is_ipi(struct mpic *mpic, unsigned int src) 615 { 616 return (src >= mpic->ipi_vecs[0] && src <= mpic->ipi_vecs[3]); 617 } 618 619 /* Determine if the linux irq is a timer */ 620 static unsigned int mpic_is_tm(struct mpic *mpic, unsigned int src) 621 { 622 return (src >= mpic->timer_vecs[0] && src <= mpic->timer_vecs[7]); 623 } 624 625 /* Convert a cpu mask from logical to physical cpu numbers. */ 626 static inline u32 mpic_physmask(u32 cpumask) 627 { 628 int i; 629 u32 mask = 0; 630 631 for (i = 0; i < min(32, NR_CPUS) && cpu_possible(i); ++i, cpumask >>= 1) 632 mask |= (cpumask & 1) << get_hard_smp_processor_id(i); 633 return mask; 634 } 635 636 #ifdef CONFIG_SMP 637 /* Get the mpic structure from the IPI number */ 638 static inline struct mpic * mpic_from_ipi(struct irq_data *d) 639 { 640 return irq_data_get_irq_chip_data(d); 641 } 642 #endif 643 644 /* Get the mpic structure from the irq number */ 645 static inline struct mpic * mpic_from_irq(unsigned int irq) 646 { 647 return irq_get_chip_data(irq); 648 } 649 650 /* Get the mpic structure from the irq data */ 651 static inline struct mpic * mpic_from_irq_data(struct irq_data *d) 652 { 653 return irq_data_get_irq_chip_data(d); 654 } 655 656 /* Send an EOI */ 657 static inline void mpic_eoi(struct mpic *mpic) 658 { 659 mpic_cpu_write(MPIC_INFO(CPU_EOI), 0); 660 } 661 662 /* 663 * Linux descriptor level callbacks 664 */ 665 666 667 void mpic_unmask_irq(struct irq_data *d) 668 { 669 unsigned int loops = 100000; 670 struct mpic *mpic = mpic_from_irq_data(d); 671 unsigned int src = irqd_to_hwirq(d); 672 673 DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, d->irq, src); 674 675 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), 676 mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & 677 ~MPIC_VECPRI_MASK); 678 /* make sure mask gets to controller before we return to user */ 679 do { 680 if (!loops--) { 681 printk(KERN_ERR "%s: timeout on hwirq %u\n", 682 __func__, src); 683 break; 684 } 685 } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK); 686 } 687 688 void mpic_mask_irq(struct irq_data *d) 689 { 690 unsigned int loops = 100000; 691 struct mpic *mpic = mpic_from_irq_data(d); 692 unsigned int src = irqd_to_hwirq(d); 693 694 DBG("%s: disable_irq: %d (src %d)\n", mpic->name, d->irq, src); 695 696 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), 697 mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) | 698 MPIC_VECPRI_MASK); 699 700 /* make sure mask gets to controller before we return to user */ 701 do { 702 if (!loops--) { 703 printk(KERN_ERR "%s: timeout on hwirq %u\n", 704 __func__, src); 705 break; 706 } 707 } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK)); 708 } 709 710 void mpic_end_irq(struct irq_data *d) 711 { 712 struct mpic *mpic = mpic_from_irq_data(d); 713 714 #ifdef DEBUG_IRQ 715 DBG("%s: end_irq: %d\n", mpic->name, d->irq); 716 #endif 717 /* We always EOI on end_irq() even for edge interrupts since that 718 * should only lower the priority, the MPIC should have properly 719 * latched another edge interrupt coming in anyway 720 */ 721 722 mpic_eoi(mpic); 723 } 724 725 #ifdef CONFIG_MPIC_U3_HT_IRQS 726 727 static void mpic_unmask_ht_irq(struct irq_data *d) 728 { 729 struct mpic *mpic = mpic_from_irq_data(d); 730 unsigned int src = irqd_to_hwirq(d); 731 732 mpic_unmask_irq(d); 733 734 if (irqd_is_level_type(d)) 735 mpic_ht_end_irq(mpic, src); 736 } 737 738 static unsigned int mpic_startup_ht_irq(struct irq_data *d) 739 { 740 struct mpic *mpic = mpic_from_irq_data(d); 741 unsigned int src = irqd_to_hwirq(d); 742 743 mpic_unmask_irq(d); 744 mpic_startup_ht_interrupt(mpic, src, irqd_is_level_type(d)); 745 746 return 0; 747 } 748 749 static void mpic_shutdown_ht_irq(struct irq_data *d) 750 { 751 struct mpic *mpic = mpic_from_irq_data(d); 752 unsigned int src = irqd_to_hwirq(d); 753 754 mpic_shutdown_ht_interrupt(mpic, src); 755 mpic_mask_irq(d); 756 } 757 758 static void mpic_end_ht_irq(struct irq_data *d) 759 { 760 struct mpic *mpic = mpic_from_irq_data(d); 761 unsigned int src = irqd_to_hwirq(d); 762 763 #ifdef DEBUG_IRQ 764 DBG("%s: end_irq: %d\n", mpic->name, d->irq); 765 #endif 766 /* We always EOI on end_irq() even for edge interrupts since that 767 * should only lower the priority, the MPIC should have properly 768 * latched another edge interrupt coming in anyway 769 */ 770 771 if (irqd_is_level_type(d)) 772 mpic_ht_end_irq(mpic, src); 773 mpic_eoi(mpic); 774 } 775 #endif /* !CONFIG_MPIC_U3_HT_IRQS */ 776 777 #ifdef CONFIG_SMP 778 779 static void mpic_unmask_ipi(struct irq_data *d) 780 { 781 struct mpic *mpic = mpic_from_ipi(d); 782 unsigned int src = virq_to_hw(d->irq) - mpic->ipi_vecs[0]; 783 784 DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, d->irq, src); 785 mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK); 786 } 787 788 static void mpic_mask_ipi(struct irq_data *d) 789 { 790 /* NEVER disable an IPI... that's just plain wrong! */ 791 } 792 793 static void mpic_end_ipi(struct irq_data *d) 794 { 795 struct mpic *mpic = mpic_from_ipi(d); 796 797 /* 798 * IPIs are marked IRQ_PER_CPU. This has the side effect of 799 * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from 800 * applying to them. We EOI them late to avoid re-entering. 801 */ 802 mpic_eoi(mpic); 803 } 804 805 #endif /* CONFIG_SMP */ 806 807 static void mpic_unmask_tm(struct irq_data *d) 808 { 809 struct mpic *mpic = mpic_from_irq_data(d); 810 unsigned int src = virq_to_hw(d->irq) - mpic->timer_vecs[0]; 811 812 DBG("%s: enable_tm: %d (tm %d)\n", mpic->name, d->irq, src); 813 mpic_tm_write(src, mpic_tm_read(src) & ~MPIC_VECPRI_MASK); 814 mpic_tm_read(src); 815 } 816 817 static void mpic_mask_tm(struct irq_data *d) 818 { 819 struct mpic *mpic = mpic_from_irq_data(d); 820 unsigned int src = virq_to_hw(d->irq) - mpic->timer_vecs[0]; 821 822 mpic_tm_write(src, mpic_tm_read(src) | MPIC_VECPRI_MASK); 823 mpic_tm_read(src); 824 } 825 826 int mpic_set_affinity(struct irq_data *d, const struct cpumask *cpumask, 827 bool force) 828 { 829 struct mpic *mpic = mpic_from_irq_data(d); 830 unsigned int src = irqd_to_hwirq(d); 831 832 if (mpic->flags & MPIC_SINGLE_DEST_CPU) { 833 int cpuid = irq_choose_cpu(cpumask); 834 835 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid); 836 } else { 837 u32 mask = cpumask_bits(cpumask)[0]; 838 839 mask &= cpumask_bits(cpu_online_mask)[0]; 840 841 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 842 mpic_physmask(mask)); 843 } 844 845 return IRQ_SET_MASK_OK; 846 } 847 848 static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type) 849 { 850 /* Now convert sense value */ 851 switch(type & IRQ_TYPE_SENSE_MASK) { 852 case IRQ_TYPE_EDGE_RISING: 853 return MPIC_INFO(VECPRI_SENSE_EDGE) | 854 MPIC_INFO(VECPRI_POLARITY_POSITIVE); 855 case IRQ_TYPE_EDGE_FALLING: 856 case IRQ_TYPE_EDGE_BOTH: 857 return MPIC_INFO(VECPRI_SENSE_EDGE) | 858 MPIC_INFO(VECPRI_POLARITY_NEGATIVE); 859 case IRQ_TYPE_LEVEL_HIGH: 860 return MPIC_INFO(VECPRI_SENSE_LEVEL) | 861 MPIC_INFO(VECPRI_POLARITY_POSITIVE); 862 case IRQ_TYPE_LEVEL_LOW: 863 default: 864 return MPIC_INFO(VECPRI_SENSE_LEVEL) | 865 MPIC_INFO(VECPRI_POLARITY_NEGATIVE); 866 } 867 } 868 869 int mpic_set_irq_type(struct irq_data *d, unsigned int flow_type) 870 { 871 struct mpic *mpic = mpic_from_irq_data(d); 872 unsigned int src = irqd_to_hwirq(d); 873 unsigned int vecpri, vold, vnew; 874 875 DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n", 876 mpic, d->irq, src, flow_type); 877 878 if (src >= mpic->num_sources) 879 return -EINVAL; 880 881 vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)); 882 883 /* We don't support "none" type */ 884 if (flow_type == IRQ_TYPE_NONE) 885 flow_type = IRQ_TYPE_DEFAULT; 886 887 /* Default: read HW settings */ 888 if (flow_type == IRQ_TYPE_DEFAULT) { 889 int vold_ps; 890 891 vold_ps = vold & (MPIC_INFO(VECPRI_POLARITY_MASK) | 892 MPIC_INFO(VECPRI_SENSE_MASK)); 893 894 if (vold_ps == (MPIC_INFO(VECPRI_SENSE_EDGE) | 895 MPIC_INFO(VECPRI_POLARITY_POSITIVE))) 896 flow_type = IRQ_TYPE_EDGE_RISING; 897 else if (vold_ps == (MPIC_INFO(VECPRI_SENSE_EDGE) | 898 MPIC_INFO(VECPRI_POLARITY_NEGATIVE))) 899 flow_type = IRQ_TYPE_EDGE_FALLING; 900 else if (vold_ps == (MPIC_INFO(VECPRI_SENSE_LEVEL) | 901 MPIC_INFO(VECPRI_POLARITY_POSITIVE))) 902 flow_type = IRQ_TYPE_LEVEL_HIGH; 903 else if (vold_ps == (MPIC_INFO(VECPRI_SENSE_LEVEL) | 904 MPIC_INFO(VECPRI_POLARITY_NEGATIVE))) 905 flow_type = IRQ_TYPE_LEVEL_LOW; 906 else 907 WARN_ONCE(1, "mpic: unknown IRQ type %d\n", vold); 908 } 909 910 /* Apply to irq desc */ 911 irqd_set_trigger_type(d, flow_type); 912 913 /* Apply to HW */ 914 if (mpic_is_ht_interrupt(mpic, src)) 915 vecpri = MPIC_VECPRI_POLARITY_POSITIVE | 916 MPIC_VECPRI_SENSE_EDGE; 917 else 918 vecpri = mpic_type_to_vecpri(mpic, flow_type); 919 920 vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) | 921 MPIC_INFO(VECPRI_SENSE_MASK)); 922 vnew |= vecpri; 923 if (vold != vnew) 924 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew); 925 926 return IRQ_SET_MASK_OK_NOCOPY; 927 } 928 929 void mpic_set_vector(unsigned int virq, unsigned int vector) 930 { 931 struct mpic *mpic = mpic_from_irq(virq); 932 unsigned int src = virq_to_hw(virq); 933 unsigned int vecpri; 934 935 DBG("mpic: set_vector(mpic:@%p,virq:%d,src:%d,vector:0x%x)\n", 936 mpic, virq, src, vector); 937 938 if (src >= mpic->num_sources) 939 return; 940 941 vecpri = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)); 942 vecpri = vecpri & ~MPIC_INFO(VECPRI_VECTOR_MASK); 943 vecpri |= vector; 944 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vecpri); 945 } 946 947 static void mpic_set_destination(unsigned int virq, unsigned int cpuid) 948 { 949 struct mpic *mpic = mpic_from_irq(virq); 950 unsigned int src = virq_to_hw(virq); 951 952 DBG("mpic: set_destination(mpic:@%p,virq:%d,src:%d,cpuid:0x%x)\n", 953 mpic, virq, src, cpuid); 954 955 if (src >= mpic->num_sources) 956 return; 957 958 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid); 959 } 960 961 static struct irq_chip mpic_irq_chip = { 962 .irq_mask = mpic_mask_irq, 963 .irq_unmask = mpic_unmask_irq, 964 .irq_eoi = mpic_end_irq, 965 .irq_set_type = mpic_set_irq_type, 966 }; 967 968 #ifdef CONFIG_SMP 969 static const struct irq_chip mpic_ipi_chip = { 970 .irq_mask = mpic_mask_ipi, 971 .irq_unmask = mpic_unmask_ipi, 972 .irq_eoi = mpic_end_ipi, 973 }; 974 #endif /* CONFIG_SMP */ 975 976 static struct irq_chip mpic_tm_chip = { 977 .irq_mask = mpic_mask_tm, 978 .irq_unmask = mpic_unmask_tm, 979 .irq_eoi = mpic_end_irq, 980 }; 981 982 #ifdef CONFIG_MPIC_U3_HT_IRQS 983 static const struct irq_chip mpic_irq_ht_chip = { 984 .irq_startup = mpic_startup_ht_irq, 985 .irq_shutdown = mpic_shutdown_ht_irq, 986 .irq_mask = mpic_mask_irq, 987 .irq_unmask = mpic_unmask_ht_irq, 988 .irq_eoi = mpic_end_ht_irq, 989 .irq_set_type = mpic_set_irq_type, 990 }; 991 #endif /* CONFIG_MPIC_U3_HT_IRQS */ 992 993 994 static int mpic_host_match(struct irq_domain *h, struct device_node *node, 995 enum irq_domain_bus_token bus_token) 996 { 997 /* Exact match, unless mpic node is NULL */ 998 struct device_node *of_node = irq_domain_get_of_node(h); 999 return of_node == NULL || of_node == node; 1000 } 1001 1002 static int mpic_host_map(struct irq_domain *h, unsigned int virq, 1003 irq_hw_number_t hw) 1004 { 1005 struct mpic *mpic = h->host_data; 1006 struct irq_chip *chip; 1007 1008 DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw); 1009 1010 if (hw == mpic->spurious_vec) 1011 return -EINVAL; 1012 if (mpic->protected && test_bit(hw, mpic->protected)) { 1013 pr_warn("mpic: Mapping of source 0x%x failed, source protected by firmware !\n", 1014 (unsigned int)hw); 1015 return -EPERM; 1016 } 1017 1018 #ifdef CONFIG_SMP 1019 else if (hw >= mpic->ipi_vecs[0]) { 1020 WARN_ON(mpic->flags & MPIC_SECONDARY); 1021 1022 DBG("mpic: mapping as IPI\n"); 1023 irq_set_chip_data(virq, mpic); 1024 irq_set_chip_and_handler(virq, &mpic->hc_ipi, 1025 handle_percpu_irq); 1026 return 0; 1027 } 1028 #endif /* CONFIG_SMP */ 1029 1030 if (hw >= mpic->timer_vecs[0] && hw <= mpic->timer_vecs[7]) { 1031 WARN_ON(mpic->flags & MPIC_SECONDARY); 1032 1033 DBG("mpic: mapping as timer\n"); 1034 irq_set_chip_data(virq, mpic); 1035 irq_set_chip_and_handler(virq, &mpic->hc_tm, 1036 handle_fasteoi_irq); 1037 return 0; 1038 } 1039 1040 if (mpic_map_error_int(mpic, virq, hw)) 1041 return 0; 1042 1043 if (hw >= mpic->num_sources) { 1044 pr_warn("mpic: Mapping of source 0x%x failed, source out of range !\n", 1045 (unsigned int)hw); 1046 return -EINVAL; 1047 } 1048 1049 mpic_msi_reserve_hwirq(mpic, hw); 1050 1051 /* Default chip */ 1052 chip = &mpic->hc_irq; 1053 1054 #ifdef CONFIG_MPIC_U3_HT_IRQS 1055 /* Check for HT interrupts, override vecpri */ 1056 if (mpic_is_ht_interrupt(mpic, hw)) 1057 chip = &mpic->hc_ht_irq; 1058 #endif /* CONFIG_MPIC_U3_HT_IRQS */ 1059 1060 DBG("mpic: mapping to irq chip @%p\n", chip); 1061 1062 irq_set_chip_data(virq, mpic); 1063 irq_set_chip_and_handler(virq, chip, handle_fasteoi_irq); 1064 1065 /* Set default irq type */ 1066 irq_set_irq_type(virq, IRQ_TYPE_DEFAULT); 1067 1068 /* If the MPIC was reset, then all vectors have already been 1069 * initialized. Otherwise, a per source lazy initialization 1070 * is done here. 1071 */ 1072 if (!mpic_is_ipi(mpic, hw) && (mpic->flags & MPIC_NO_RESET)) { 1073 int cpu; 1074 1075 preempt_disable(); 1076 cpu = mpic_processor_id(mpic); 1077 preempt_enable(); 1078 1079 mpic_set_vector(virq, hw); 1080 mpic_set_destination(virq, cpu); 1081 mpic_irq_set_priority(virq, 8); 1082 } 1083 1084 return 0; 1085 } 1086 1087 static int mpic_host_xlate(struct irq_domain *h, struct device_node *ct, 1088 const u32 *intspec, unsigned int intsize, 1089 irq_hw_number_t *out_hwirq, unsigned int *out_flags) 1090 1091 { 1092 struct mpic *mpic = h->host_data; 1093 static unsigned char map_mpic_senses[4] = { 1094 IRQ_TYPE_EDGE_RISING, 1095 IRQ_TYPE_LEVEL_LOW, 1096 IRQ_TYPE_LEVEL_HIGH, 1097 IRQ_TYPE_EDGE_FALLING, 1098 }; 1099 1100 *out_hwirq = intspec[0]; 1101 if (intsize >= 4 && (mpic->flags & MPIC_FSL)) { 1102 /* 1103 * Freescale MPIC with extended intspec: 1104 * First two cells are as usual. Third specifies 1105 * an "interrupt type". Fourth is type-specific data. 1106 * 1107 * See Documentation/devicetree/bindings/powerpc/fsl/mpic.txt 1108 */ 1109 switch (intspec[2]) { 1110 case 0: 1111 break; 1112 case 1: 1113 if (!(mpic->flags & MPIC_FSL_HAS_EIMR)) 1114 break; 1115 1116 if (intspec[3] >= ARRAY_SIZE(mpic->err_int_vecs)) 1117 return -EINVAL; 1118 1119 *out_hwirq = mpic->err_int_vecs[intspec[3]]; 1120 1121 break; 1122 case 2: 1123 if (intspec[0] >= ARRAY_SIZE(mpic->ipi_vecs)) 1124 return -EINVAL; 1125 1126 *out_hwirq = mpic->ipi_vecs[intspec[0]]; 1127 break; 1128 case 3: 1129 if (intspec[0] >= ARRAY_SIZE(mpic->timer_vecs)) 1130 return -EINVAL; 1131 1132 *out_hwirq = mpic->timer_vecs[intspec[0]]; 1133 break; 1134 default: 1135 pr_debug("%s: unknown irq type %u\n", 1136 __func__, intspec[2]); 1137 return -EINVAL; 1138 } 1139 1140 *out_flags = map_mpic_senses[intspec[1] & 3]; 1141 } else if (intsize > 1) { 1142 u32 mask = 0x3; 1143 1144 /* Apple invented a new race of encoding on machines with 1145 * an HT APIC. They encode, among others, the index within 1146 * the HT APIC. We don't care about it here since thankfully, 1147 * it appears that they have the APIC already properly 1148 * configured, and thus our current fixup code that reads the 1149 * APIC config works fine. However, we still need to mask out 1150 * bits in the specifier to make sure we only get bit 0 which 1151 * is the level/edge bit (the only sense bit exposed by Apple), 1152 * as their bit 1 means something else. 1153 */ 1154 if (machine_is(powermac)) 1155 mask = 0x1; 1156 *out_flags = map_mpic_senses[intspec[1] & mask]; 1157 } else 1158 *out_flags = IRQ_TYPE_NONE; 1159 1160 DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n", 1161 intsize, intspec[0], intspec[1], *out_hwirq, *out_flags); 1162 1163 return 0; 1164 } 1165 1166 /* IRQ handler for a secondary MPIC cascaded from another IRQ controller */ 1167 static void mpic_cascade(struct irq_desc *desc) 1168 { 1169 struct irq_chip *chip = irq_desc_get_chip(desc); 1170 struct mpic *mpic = irq_desc_get_handler_data(desc); 1171 unsigned int virq; 1172 1173 BUG_ON(!(mpic->flags & MPIC_SECONDARY)); 1174 1175 virq = mpic_get_one_irq(mpic); 1176 if (virq) 1177 generic_handle_irq(virq); 1178 1179 chip->irq_eoi(&desc->irq_data); 1180 } 1181 1182 static const struct irq_domain_ops mpic_host_ops = { 1183 .match = mpic_host_match, 1184 .map = mpic_host_map, 1185 .xlate = mpic_host_xlate, 1186 }; 1187 1188 static u32 fsl_mpic_get_version(struct mpic *mpic) 1189 { 1190 u32 brr1; 1191 1192 if (!(mpic->flags & MPIC_FSL)) 1193 return 0; 1194 1195 brr1 = _mpic_read(mpic->reg_type, &mpic->thiscpuregs, 1196 MPIC_FSL_BRR1); 1197 1198 return brr1 & MPIC_FSL_BRR1_VER; 1199 } 1200 1201 /* 1202 * Exported functions 1203 */ 1204 1205 u32 fsl_mpic_primary_get_version(void) 1206 { 1207 struct mpic *mpic = mpic_primary; 1208 1209 if (mpic) 1210 return fsl_mpic_get_version(mpic); 1211 1212 return 0; 1213 } 1214 1215 struct mpic * __init mpic_alloc(struct device_node *node, 1216 phys_addr_t phys_addr, 1217 unsigned int flags, 1218 unsigned int isu_size, 1219 unsigned int irq_count, 1220 const char *name) 1221 { 1222 int i, psize, intvec_top; 1223 struct mpic *mpic; 1224 u32 greg_feature; 1225 const char *vers; 1226 const u32 *psrc; 1227 u32 last_irq; 1228 u32 fsl_version = 0; 1229 1230 /* Default MPIC search parameters */ 1231 static const struct of_device_id __initconst mpic_device_id[] = { 1232 { .type = "open-pic", }, 1233 { .compatible = "open-pic", }, 1234 {}, 1235 }; 1236 1237 /* 1238 * If we were not passed a device-tree node, then perform the default 1239 * search for standardized a standardized OpenPIC. 1240 */ 1241 if (node) { 1242 node = of_node_get(node); 1243 } else { 1244 node = of_find_matching_node(NULL, mpic_device_id); 1245 if (!node) 1246 return NULL; 1247 } 1248 1249 /* Pick the physical address from the device tree if unspecified */ 1250 if (!phys_addr) { 1251 /* Check if it is DCR-based */ 1252 if (of_property_read_bool(node, "dcr-reg")) { 1253 flags |= MPIC_USES_DCR; 1254 } else { 1255 struct resource r; 1256 if (of_address_to_resource(node, 0, &r)) 1257 goto err_of_node_put; 1258 phys_addr = r.start; 1259 } 1260 } 1261 1262 /* Read extra device-tree properties into the flags variable */ 1263 if (of_get_property(node, "big-endian", NULL)) 1264 flags |= MPIC_BIG_ENDIAN; 1265 if (of_get_property(node, "pic-no-reset", NULL)) 1266 flags |= MPIC_NO_RESET; 1267 if (of_get_property(node, "single-cpu-affinity", NULL)) 1268 flags |= MPIC_SINGLE_DEST_CPU; 1269 if (of_device_is_compatible(node, "fsl,mpic")) { 1270 flags |= MPIC_FSL | MPIC_LARGE_VECTORS; 1271 mpic_irq_chip.flags |= IRQCHIP_SKIP_SET_WAKE; 1272 mpic_tm_chip.flags |= IRQCHIP_SKIP_SET_WAKE; 1273 } 1274 1275 mpic = kzalloc(sizeof(struct mpic), GFP_KERNEL); 1276 if (mpic == NULL) 1277 goto err_of_node_put; 1278 1279 mpic->name = name; 1280 mpic->node = node; 1281 mpic->paddr = phys_addr; 1282 mpic->flags = flags; 1283 1284 mpic->hc_irq = mpic_irq_chip; 1285 mpic->hc_irq.name = name; 1286 if (!(mpic->flags & MPIC_SECONDARY)) 1287 mpic->hc_irq.irq_set_affinity = mpic_set_affinity; 1288 #ifdef CONFIG_MPIC_U3_HT_IRQS 1289 mpic->hc_ht_irq = mpic_irq_ht_chip; 1290 mpic->hc_ht_irq.name = name; 1291 if (!(mpic->flags & MPIC_SECONDARY)) 1292 mpic->hc_ht_irq.irq_set_affinity = mpic_set_affinity; 1293 #endif /* CONFIG_MPIC_U3_HT_IRQS */ 1294 1295 #ifdef CONFIG_SMP 1296 mpic->hc_ipi = mpic_ipi_chip; 1297 mpic->hc_ipi.name = name; 1298 #endif /* CONFIG_SMP */ 1299 1300 mpic->hc_tm = mpic_tm_chip; 1301 mpic->hc_tm.name = name; 1302 1303 mpic->num_sources = 0; /* so far */ 1304 1305 if (mpic->flags & MPIC_LARGE_VECTORS) 1306 intvec_top = 2047; 1307 else 1308 intvec_top = 255; 1309 1310 mpic->timer_vecs[0] = intvec_top - 12; 1311 mpic->timer_vecs[1] = intvec_top - 11; 1312 mpic->timer_vecs[2] = intvec_top - 10; 1313 mpic->timer_vecs[3] = intvec_top - 9; 1314 mpic->timer_vecs[4] = intvec_top - 8; 1315 mpic->timer_vecs[5] = intvec_top - 7; 1316 mpic->timer_vecs[6] = intvec_top - 6; 1317 mpic->timer_vecs[7] = intvec_top - 5; 1318 mpic->ipi_vecs[0] = intvec_top - 4; 1319 mpic->ipi_vecs[1] = intvec_top - 3; 1320 mpic->ipi_vecs[2] = intvec_top - 2; 1321 mpic->ipi_vecs[3] = intvec_top - 1; 1322 mpic->spurious_vec = intvec_top; 1323 1324 /* Look for protected sources */ 1325 psrc = of_get_property(mpic->node, "protected-sources", &psize); 1326 if (psrc) { 1327 /* Allocate a bitmap with one bit per interrupt */ 1328 mpic->protected = bitmap_zalloc(intvec_top + 1, GFP_KERNEL); 1329 BUG_ON(mpic->protected == NULL); 1330 for (i = 0; i < psize/sizeof(u32); i++) { 1331 if (psrc[i] > intvec_top) 1332 continue; 1333 __set_bit(psrc[i], mpic->protected); 1334 } 1335 } 1336 1337 #ifdef CONFIG_MPIC_WEIRD 1338 mpic->hw_set = mpic_infos[MPIC_GET_REGSET(mpic->flags)]; 1339 #endif 1340 1341 /* default register type */ 1342 if (mpic->flags & MPIC_BIG_ENDIAN) 1343 mpic->reg_type = mpic_access_mmio_be; 1344 else 1345 mpic->reg_type = mpic_access_mmio_le; 1346 1347 /* 1348 * An MPIC with a "dcr-reg" property must be accessed that way, but 1349 * only if the kernel includes DCR support. 1350 */ 1351 #ifdef CONFIG_PPC_DCR 1352 if (mpic->flags & MPIC_USES_DCR) 1353 mpic->reg_type = mpic_access_dcr; 1354 #else 1355 BUG_ON(mpic->flags & MPIC_USES_DCR); 1356 #endif 1357 1358 /* Map the global registers */ 1359 mpic_map(mpic, mpic->paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000); 1360 mpic_map(mpic, mpic->paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000); 1361 1362 if (mpic->flags & MPIC_FSL) { 1363 int ret; 1364 1365 /* 1366 * Yes, Freescale really did put global registers in the 1367 * magic per-cpu area -- and they don't even show up in the 1368 * non-magic per-cpu copies that this driver normally uses. 1369 */ 1370 mpic_map(mpic, mpic->paddr, &mpic->thiscpuregs, 1371 MPIC_CPU_THISBASE, 0x1000); 1372 1373 fsl_version = fsl_mpic_get_version(mpic); 1374 1375 /* Error interrupt mask register (EIMR) is required for 1376 * handling individual device error interrupts. EIMR 1377 * was added in MPIC version 4.1. 1378 * 1379 * Over here we reserve vector number space for error 1380 * interrupt vectors. This space is stolen from the 1381 * global vector number space, as in case of ipis 1382 * and timer interrupts. 1383 * 1384 * Available vector space = intvec_top - 13, where 13 1385 * is the number of vectors which have been consumed by 1386 * ipis, timer interrupts and spurious. 1387 */ 1388 if (fsl_version >= 0x401) { 1389 ret = mpic_setup_error_int(mpic, intvec_top - 13); 1390 if (ret) 1391 return NULL; 1392 } 1393 1394 } 1395 1396 /* 1397 * EPR is only available starting with v4.0. To support 1398 * platforms that don't know the MPIC version at compile-time, 1399 * such as qemu-e500, turn off coreint if this MPIC doesn't 1400 * support it. Note that we never enable it if it wasn't 1401 * requested in the first place. 1402 * 1403 * This is done outside the MPIC_FSL check, so that we 1404 * also disable coreint if the MPIC node doesn't have 1405 * an "fsl,mpic" compatible at all. This will be the case 1406 * with device trees generated by older versions of QEMU. 1407 * fsl_version will be zero if MPIC_FSL is not set. 1408 */ 1409 if (fsl_version < 0x400 && (flags & MPIC_ENABLE_COREINT)) 1410 ppc_md.get_irq = mpic_get_irq; 1411 1412 /* Reset */ 1413 1414 /* When using a device-node, reset requests are only honored if the MPIC 1415 * is allowed to reset. 1416 */ 1417 if (!(mpic->flags & MPIC_NO_RESET)) { 1418 printk(KERN_DEBUG "mpic: Resetting\n"); 1419 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0), 1420 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0)) 1421 | MPIC_GREG_GCONF_RESET); 1422 while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0)) 1423 & MPIC_GREG_GCONF_RESET) 1424 mb(); 1425 } 1426 1427 /* CoreInt */ 1428 if (mpic->flags & MPIC_ENABLE_COREINT) 1429 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0), 1430 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0)) 1431 | MPIC_GREG_GCONF_COREINT); 1432 1433 if (mpic->flags & MPIC_ENABLE_MCK) 1434 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0), 1435 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0)) 1436 | MPIC_GREG_GCONF_MCK); 1437 1438 /* 1439 * The MPIC driver will crash if there are more cores than we 1440 * can initialize, so we may as well catch that problem here. 1441 */ 1442 BUG_ON(num_possible_cpus() > MPIC_MAX_CPUS); 1443 1444 /* Map the per-CPU registers */ 1445 for_each_possible_cpu(i) { 1446 unsigned int cpu = get_hard_smp_processor_id(i); 1447 1448 mpic_map(mpic, mpic->paddr, &mpic->cpuregs[cpu], 1449 MPIC_INFO(CPU_BASE) + cpu * MPIC_INFO(CPU_STRIDE), 1450 0x1000); 1451 } 1452 1453 /* 1454 * Read feature register. For non-ISU MPICs, num sources as well. On 1455 * ISU MPICs, sources are counted as ISUs are added 1456 */ 1457 greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0)); 1458 1459 /* 1460 * By default, the last source number comes from the MPIC, but the 1461 * device-tree and board support code can override it on buggy hw. 1462 * If we get passed an isu_size (multi-isu MPIC) then we use that 1463 * as a default instead of the value read from the HW. 1464 */ 1465 last_irq = (greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK) 1466 >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT; 1467 if (isu_size) 1468 last_irq = isu_size * MPIC_MAX_ISU - 1; 1469 of_property_read_u32(mpic->node, "last-interrupt-source", &last_irq); 1470 if (irq_count) 1471 last_irq = irq_count - 1; 1472 1473 /* Initialize main ISU if none provided */ 1474 if (!isu_size) { 1475 isu_size = last_irq + 1; 1476 mpic->num_sources = isu_size; 1477 mpic_map(mpic, mpic->paddr, &mpic->isus[0], 1478 MPIC_INFO(IRQ_BASE), 1479 MPIC_INFO(IRQ_STRIDE) * isu_size); 1480 } 1481 1482 mpic->isu_size = isu_size; 1483 mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1); 1484 mpic->isu_mask = (1 << mpic->isu_shift) - 1; 1485 1486 mpic->irqhost = irq_domain_add_linear(mpic->node, 1487 intvec_top, 1488 &mpic_host_ops, mpic); 1489 1490 /* 1491 * FIXME: The code leaks the MPIC object and mappings here; this 1492 * is very unlikely to fail but it ought to be fixed anyways. 1493 */ 1494 if (mpic->irqhost == NULL) 1495 return NULL; 1496 1497 /* Display version */ 1498 switch (greg_feature & MPIC_GREG_FEATURE_VERSION_MASK) { 1499 case 1: 1500 vers = "1.0"; 1501 break; 1502 case 2: 1503 vers = "1.2"; 1504 break; 1505 case 3: 1506 vers = "1.3"; 1507 break; 1508 default: 1509 vers = "<unknown>"; 1510 break; 1511 } 1512 printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx," 1513 " max %d CPUs\n", 1514 name, vers, (unsigned long long)mpic->paddr, num_possible_cpus()); 1515 printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n", 1516 mpic->isu_size, mpic->isu_shift, mpic->isu_mask); 1517 1518 mpic->next = mpics; 1519 mpics = mpic; 1520 1521 if (!(mpic->flags & MPIC_SECONDARY)) { 1522 mpic_primary = mpic; 1523 irq_set_default_host(mpic->irqhost); 1524 } 1525 1526 return mpic; 1527 1528 err_of_node_put: 1529 of_node_put(node); 1530 return NULL; 1531 } 1532 1533 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num, 1534 phys_addr_t paddr) 1535 { 1536 unsigned int isu_first = isu_num * mpic->isu_size; 1537 1538 BUG_ON(isu_num >= MPIC_MAX_ISU); 1539 1540 mpic_map(mpic, 1541 paddr, &mpic->isus[isu_num], 0, 1542 MPIC_INFO(IRQ_STRIDE) * mpic->isu_size); 1543 1544 if ((isu_first + mpic->isu_size) > mpic->num_sources) 1545 mpic->num_sources = isu_first + mpic->isu_size; 1546 } 1547 1548 void __init mpic_init(struct mpic *mpic) 1549 { 1550 int i, cpu; 1551 int num_timers = 4; 1552 1553 BUG_ON(mpic->num_sources == 0); 1554 1555 printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources); 1556 1557 /* Set current processor priority to max */ 1558 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf); 1559 1560 if (mpic->flags & MPIC_FSL) { 1561 u32 version = fsl_mpic_get_version(mpic); 1562 1563 /* 1564 * Timer group B is present at the latest in MPIC 3.1 (e.g. 1565 * mpc8536). It is not present in MPIC 2.0 (e.g. mpc8544). 1566 * I don't know about the status of intermediate versions (or 1567 * whether they even exist). 1568 */ 1569 if (version >= 0x0301) 1570 num_timers = 8; 1571 } 1572 1573 /* Initialize timers to our reserved vectors and mask them for now */ 1574 for (i = 0; i < num_timers; i++) { 1575 unsigned int offset = mpic_tm_offset(mpic, i); 1576 1577 mpic_write(mpic->tmregs, 1578 offset + MPIC_INFO(TIMER_DESTINATION), 1579 1 << hard_smp_processor_id()); 1580 mpic_write(mpic->tmregs, 1581 offset + MPIC_INFO(TIMER_VECTOR_PRI), 1582 MPIC_VECPRI_MASK | 1583 (9 << MPIC_VECPRI_PRIORITY_SHIFT) | 1584 (mpic->timer_vecs[0] + i)); 1585 } 1586 1587 /* Initialize IPIs to our reserved vectors and mark them disabled for now */ 1588 mpic_test_broken_ipi(mpic); 1589 for (i = 0; i < 4; i++) { 1590 mpic_ipi_write(i, 1591 MPIC_VECPRI_MASK | 1592 (10 << MPIC_VECPRI_PRIORITY_SHIFT) | 1593 (mpic->ipi_vecs[0] + i)); 1594 } 1595 1596 /* Do the HT PIC fixups on U3 broken mpic */ 1597 DBG("MPIC flags: %x\n", mpic->flags); 1598 if ((mpic->flags & MPIC_U3_HT_IRQS) && !(mpic->flags & MPIC_SECONDARY)) { 1599 mpic_scan_ht_pics(mpic); 1600 mpic_u3msi_init(mpic); 1601 } 1602 1603 mpic_pasemi_msi_init(mpic); 1604 1605 cpu = mpic_processor_id(mpic); 1606 1607 if (!(mpic->flags & MPIC_NO_RESET)) { 1608 for (i = 0; i < mpic->num_sources; i++) { 1609 /* start with vector = source number, and masked */ 1610 u32 vecpri = MPIC_VECPRI_MASK | i | 1611 (8 << MPIC_VECPRI_PRIORITY_SHIFT); 1612 1613 /* check if protected */ 1614 if (mpic->protected && test_bit(i, mpic->protected)) 1615 continue; 1616 /* init hw */ 1617 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri); 1618 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1 << cpu); 1619 } 1620 } 1621 1622 /* Init spurious vector */ 1623 mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), mpic->spurious_vec); 1624 1625 /* Disable 8259 passthrough, if supported */ 1626 if (!(mpic->flags & MPIC_NO_PTHROU_DIS)) 1627 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0), 1628 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0)) 1629 | MPIC_GREG_GCONF_8259_PTHROU_DIS); 1630 1631 if (mpic->flags & MPIC_NO_BIAS) 1632 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0), 1633 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0)) 1634 | MPIC_GREG_GCONF_NO_BIAS); 1635 1636 /* Set current processor priority to 0 */ 1637 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0); 1638 1639 #ifdef CONFIG_PM 1640 /* allocate memory to save mpic state */ 1641 mpic->save_data = kmalloc_array(mpic->num_sources, 1642 sizeof(*mpic->save_data), 1643 GFP_KERNEL); 1644 BUG_ON(mpic->save_data == NULL); 1645 #endif 1646 1647 /* Check if this MPIC is chained from a parent interrupt controller */ 1648 if (mpic->flags & MPIC_SECONDARY) { 1649 int virq = irq_of_parse_and_map(mpic->node, 0); 1650 if (virq) { 1651 printk(KERN_INFO "%pOF: hooking up to IRQ %d\n", 1652 mpic->node, virq); 1653 irq_set_handler_data(virq, mpic); 1654 irq_set_chained_handler(virq, &mpic_cascade); 1655 } 1656 } 1657 1658 /* FSL mpic error interrupt initialization */ 1659 if (mpic->flags & MPIC_FSL_HAS_EIMR) 1660 mpic_err_int_init(mpic, MPIC_FSL_ERR_INT); 1661 } 1662 1663 void mpic_irq_set_priority(unsigned int irq, unsigned int pri) 1664 { 1665 struct mpic *mpic = mpic_find(irq); 1666 unsigned int src = virq_to_hw(irq); 1667 unsigned long flags; 1668 u32 reg; 1669 1670 if (!mpic) 1671 return; 1672 1673 raw_spin_lock_irqsave(&mpic_lock, flags); 1674 if (mpic_is_ipi(mpic, src)) { 1675 reg = mpic_ipi_read(src - mpic->ipi_vecs[0]) & 1676 ~MPIC_VECPRI_PRIORITY_MASK; 1677 mpic_ipi_write(src - mpic->ipi_vecs[0], 1678 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT)); 1679 } else if (mpic_is_tm(mpic, src)) { 1680 reg = mpic_tm_read(src - mpic->timer_vecs[0]) & 1681 ~MPIC_VECPRI_PRIORITY_MASK; 1682 mpic_tm_write(src - mpic->timer_vecs[0], 1683 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT)); 1684 } else { 1685 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) 1686 & ~MPIC_VECPRI_PRIORITY_MASK; 1687 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), 1688 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT)); 1689 } 1690 raw_spin_unlock_irqrestore(&mpic_lock, flags); 1691 } 1692 1693 void mpic_setup_this_cpu(void) 1694 { 1695 #ifdef CONFIG_SMP 1696 struct mpic *mpic = mpic_primary; 1697 unsigned long flags; 1698 u32 msk = 1 << hard_smp_processor_id(); 1699 unsigned int i; 1700 1701 BUG_ON(mpic == NULL); 1702 1703 DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id()); 1704 1705 raw_spin_lock_irqsave(&mpic_lock, flags); 1706 1707 /* let the mpic know we want intrs. default affinity is 0xffffffff 1708 * until changed via /proc. That's how it's done on x86. If we want 1709 * it differently, then we should make sure we also change the default 1710 * values of irq_desc[].affinity in irq.c. 1711 */ 1712 if (distribute_irqs && !(mpic->flags & MPIC_SINGLE_DEST_CPU)) { 1713 for (i = 0; i < mpic->num_sources ; i++) 1714 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1715 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk); 1716 } 1717 1718 /* Set current processor priority to 0 */ 1719 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0); 1720 1721 raw_spin_unlock_irqrestore(&mpic_lock, flags); 1722 #endif /* CONFIG_SMP */ 1723 } 1724 1725 int mpic_cpu_get_priority(void) 1726 { 1727 struct mpic *mpic = mpic_primary; 1728 1729 return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI)); 1730 } 1731 1732 void mpic_cpu_set_priority(int prio) 1733 { 1734 struct mpic *mpic = mpic_primary; 1735 1736 prio &= MPIC_CPU_TASKPRI_MASK; 1737 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio); 1738 } 1739 1740 void mpic_teardown_this_cpu(int secondary) 1741 { 1742 struct mpic *mpic = mpic_primary; 1743 unsigned long flags; 1744 u32 msk = 1 << hard_smp_processor_id(); 1745 unsigned int i; 1746 1747 BUG_ON(mpic == NULL); 1748 1749 DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id()); 1750 raw_spin_lock_irqsave(&mpic_lock, flags); 1751 1752 /* let the mpic know we don't want intrs. */ 1753 for (i = 0; i < mpic->num_sources ; i++) 1754 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1755 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk); 1756 1757 /* Set current processor priority to max */ 1758 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf); 1759 /* We need to EOI the IPI since not all platforms reset the MPIC 1760 * on boot and new interrupts wouldn't get delivered otherwise. 1761 */ 1762 mpic_eoi(mpic); 1763 1764 raw_spin_unlock_irqrestore(&mpic_lock, flags); 1765 } 1766 1767 1768 static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg) 1769 { 1770 u32 src; 1771 1772 src = mpic_cpu_read(reg) & MPIC_INFO(VECPRI_VECTOR_MASK); 1773 #ifdef DEBUG_LOW 1774 DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic->name, reg, src); 1775 #endif 1776 if (unlikely(src == mpic->spurious_vec)) { 1777 if (mpic->flags & MPIC_SPV_EOI) 1778 mpic_eoi(mpic); 1779 return 0; 1780 } 1781 if (unlikely(mpic->protected && test_bit(src, mpic->protected))) { 1782 printk_ratelimited(KERN_WARNING "%s: Got protected source %d !\n", 1783 mpic->name, (int)src); 1784 mpic_eoi(mpic); 1785 return 0; 1786 } 1787 1788 return irq_linear_revmap(mpic->irqhost, src); 1789 } 1790 1791 unsigned int mpic_get_one_irq(struct mpic *mpic) 1792 { 1793 return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK)); 1794 } 1795 1796 unsigned int mpic_get_irq(void) 1797 { 1798 struct mpic *mpic = mpic_primary; 1799 1800 BUG_ON(mpic == NULL); 1801 1802 return mpic_get_one_irq(mpic); 1803 } 1804 1805 unsigned int mpic_get_coreint_irq(void) 1806 { 1807 #ifdef CONFIG_BOOKE 1808 struct mpic *mpic = mpic_primary; 1809 u32 src; 1810 1811 BUG_ON(mpic == NULL); 1812 1813 src = mfspr(SPRN_EPR); 1814 1815 if (unlikely(src == mpic->spurious_vec)) { 1816 if (mpic->flags & MPIC_SPV_EOI) 1817 mpic_eoi(mpic); 1818 return 0; 1819 } 1820 if (unlikely(mpic->protected && test_bit(src, mpic->protected))) { 1821 printk_ratelimited(KERN_WARNING "%s: Got protected source %d !\n", 1822 mpic->name, (int)src); 1823 return 0; 1824 } 1825 1826 return irq_linear_revmap(mpic->irqhost, src); 1827 #else 1828 return 0; 1829 #endif 1830 } 1831 1832 unsigned int mpic_get_mcirq(void) 1833 { 1834 struct mpic *mpic = mpic_primary; 1835 1836 BUG_ON(mpic == NULL); 1837 1838 return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_MCACK)); 1839 } 1840 1841 #ifdef CONFIG_SMP 1842 void __init mpic_request_ipis(void) 1843 { 1844 struct mpic *mpic = mpic_primary; 1845 int i; 1846 BUG_ON(mpic == NULL); 1847 1848 printk(KERN_INFO "mpic: requesting IPIs...\n"); 1849 1850 for (i = 0; i < 4; i++) { 1851 unsigned int vipi = irq_create_mapping(mpic->irqhost, 1852 mpic->ipi_vecs[0] + i); 1853 if (!vipi) { 1854 printk(KERN_ERR "Failed to map %s\n", smp_ipi_name[i]); 1855 continue; 1856 } 1857 smp_request_message_ipi(vipi, i); 1858 } 1859 } 1860 1861 void smp_mpic_message_pass(int cpu, int msg) 1862 { 1863 struct mpic *mpic = mpic_primary; 1864 u32 physmask; 1865 1866 BUG_ON(mpic == NULL); 1867 1868 /* make sure we're sending something that translates to an IPI */ 1869 if ((unsigned int)msg > 3) { 1870 printk("SMP %d: smp_message_pass: unknown msg %d\n", 1871 smp_processor_id(), msg); 1872 return; 1873 } 1874 1875 #ifdef DEBUG_IPI 1876 DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, msg); 1877 #endif 1878 1879 physmask = 1 << get_hard_smp_processor_id(cpu); 1880 1881 mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) + 1882 msg * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE), physmask); 1883 } 1884 1885 void __init smp_mpic_probe(void) 1886 { 1887 int nr_cpus; 1888 1889 DBG("smp_mpic_probe()...\n"); 1890 1891 nr_cpus = num_possible_cpus(); 1892 1893 DBG("nr_cpus: %d\n", nr_cpus); 1894 1895 if (nr_cpus > 1) 1896 mpic_request_ipis(); 1897 } 1898 1899 void smp_mpic_setup_cpu(int cpu) 1900 { 1901 mpic_setup_this_cpu(); 1902 } 1903 1904 void mpic_reset_core(int cpu) 1905 { 1906 struct mpic *mpic = mpic_primary; 1907 u32 pir; 1908 int cpuid = get_hard_smp_processor_id(cpu); 1909 int i; 1910 1911 /* Set target bit for core reset */ 1912 pir = mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT)); 1913 pir |= (1 << cpuid); 1914 mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir); 1915 mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT)); 1916 1917 /* Restore target bit after reset complete */ 1918 pir &= ~(1 << cpuid); 1919 mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir); 1920 mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT)); 1921 1922 /* Perform 15 EOI on each reset core to clear pending interrupts. 1923 * This is required for FSL CoreNet based devices */ 1924 if (mpic->flags & MPIC_FSL) { 1925 for (i = 0; i < 15; i++) { 1926 _mpic_write(mpic->reg_type, &mpic->cpuregs[cpuid], 1927 MPIC_CPU_EOI, 0); 1928 } 1929 } 1930 } 1931 #endif /* CONFIG_SMP */ 1932 1933 #ifdef CONFIG_PM 1934 static void mpic_suspend_one(struct mpic *mpic) 1935 { 1936 int i; 1937 1938 for (i = 0; i < mpic->num_sources; i++) { 1939 mpic->save_data[i].vecprio = 1940 mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI)); 1941 mpic->save_data[i].dest = 1942 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)); 1943 } 1944 } 1945 1946 static int mpic_suspend(void) 1947 { 1948 struct mpic *mpic = mpics; 1949 1950 while (mpic) { 1951 mpic_suspend_one(mpic); 1952 mpic = mpic->next; 1953 } 1954 1955 return 0; 1956 } 1957 1958 static void mpic_resume_one(struct mpic *mpic) 1959 { 1960 int i; 1961 1962 for (i = 0; i < mpic->num_sources; i++) { 1963 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), 1964 mpic->save_data[i].vecprio); 1965 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1966 mpic->save_data[i].dest); 1967 1968 #ifdef CONFIG_MPIC_U3_HT_IRQS 1969 if (mpic->fixups) { 1970 struct mpic_irq_fixup *fixup = &mpic->fixups[i]; 1971 1972 if (fixup->base) { 1973 /* we use the lowest bit in an inverted meaning */ 1974 if ((mpic->save_data[i].fixup_data & 1) == 0) 1975 continue; 1976 1977 /* Enable and configure */ 1978 writeb(0x10 + 2 * fixup->index, fixup->base + 2); 1979 1980 writel(mpic->save_data[i].fixup_data & ~1, 1981 fixup->base + 4); 1982 } 1983 } 1984 #endif 1985 } /* end for loop */ 1986 } 1987 1988 static void mpic_resume(void) 1989 { 1990 struct mpic *mpic = mpics; 1991 1992 while (mpic) { 1993 mpic_resume_one(mpic); 1994 mpic = mpic->next; 1995 } 1996 } 1997 1998 static struct syscore_ops mpic_syscore_ops = { 1999 .resume = mpic_resume, 2000 .suspend = mpic_suspend, 2001 }; 2002 2003 static int mpic_init_sys(void) 2004 { 2005 int rc; 2006 2007 register_syscore_ops(&mpic_syscore_ops); 2008 rc = subsys_system_register(&mpic_subsys, NULL); 2009 if (rc) { 2010 unregister_syscore_ops(&mpic_syscore_ops); 2011 pr_err("mpic: Failed to register subsystem!\n"); 2012 return rc; 2013 } 2014 2015 return 0; 2016 } 2017 2018 device_initcall(mpic_init_sys); 2019 #endif 2020