arch/powerpc/sysdev/mpic.c

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