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                 MPIC_CPU_MCACK,
  87
  88                 MPIC_IRQ_BASE,
  89                 MPIC_IRQ_STRIDE,
  90                 MPIC_IRQ_VECTOR_PRI,
  91                 MPIC_VECPRI_VECTOR_MASK,
  92                 MPIC_VECPRI_POLARITY_POSITIVE,
  93                 MPIC_VECPRI_POLARITY_NEGATIVE,
  94                 MPIC_VECPRI_SENSE_LEVEL,
  95                 MPIC_VECPRI_SENSE_EDGE,
  96                 MPIC_VECPRI_POLARITY_MASK,
  97                 MPIC_VECPRI_SENSE_MASK,
  98                 MPIC_IRQ_DESTINATION
  99         },
 100         [1] = { /* Tsi108/109 PIC */
 101                 TSI108_GREG_BASE,
 102                 TSI108_GREG_FEATURE_0,
 103                 TSI108_GREG_GLOBAL_CONF_0,
 104                 TSI108_GREG_VENDOR_ID,
 105                 TSI108_GREG_IPI_VECTOR_PRI_0,
 106                 TSI108_GREG_IPI_STRIDE,
 107                 TSI108_GREG_SPURIOUS,
 108                 TSI108_GREG_TIMER_FREQ,
 109
 110                 TSI108_TIMER_BASE,
 111                 TSI108_TIMER_STRIDE,
 112                 TSI108_TIMER_CURRENT_CNT,
 113                 TSI108_TIMER_BASE_CNT,
 114                 TSI108_TIMER_VECTOR_PRI,
 115                 TSI108_TIMER_DESTINATION,
 116
 117                 TSI108_CPU_BASE,
 118                 TSI108_CPU_STRIDE,
 119                 TSI108_CPU_IPI_DISPATCH_0,
 120                 TSI108_CPU_IPI_DISPATCH_STRIDE,
 121                 TSI108_CPU_CURRENT_TASK_PRI,
 122                 TSI108_CPU_WHOAMI,
 123                 TSI108_CPU_INTACK,
 124                 TSI108_CPU_EOI,
 125                 TSI108_CPU_MCACK,
 126
 127                 TSI108_IRQ_BASE,
 128                 TSI108_IRQ_STRIDE,
 129                 TSI108_IRQ_VECTOR_PRI,
 130                 TSI108_VECPRI_VECTOR_MASK,
 131                 TSI108_VECPRI_POLARITY_POSITIVE,
 132                 TSI108_VECPRI_POLARITY_NEGATIVE,
 133                 TSI108_VECPRI_SENSE_LEVEL,
 134                 TSI108_VECPRI_SENSE_EDGE,
 135                 TSI108_VECPRI_POLARITY_MASK,
 136                 TSI108_VECPRI_SENSE_MASK,
 137                 TSI108_IRQ_DESTINATION
 138         },
 139 };
 140
 141 #define MPIC_INFO(name) mpic->hw_set[MPIC_IDX_##name]
 142
 143 #else /* CONFIG_MPIC_WEIRD */
 144
 145 #define MPIC_INFO(name) MPIC_##name
 146
 147 #endif /* CONFIG_MPIC_WEIRD */
 148
 149 /*
 150  * Register accessor functions
 151  */
 152
 153
 154 static inline u32 _mpic_read(enum mpic_reg_type type,
 155                              struct mpic_reg_bank *rb,
 156                              unsigned int reg)
 157 {
 158         switch(type) {
 159 #ifdef CONFIG_PPC_DCR
 160         case mpic_access_dcr:
 161                 return dcr_read(rb->dhost, reg);
 162 #endif
 163         case mpic_access_mmio_be:
 164                 return in_be32(rb->base + (reg >> 2));
 165         case mpic_access_mmio_le:
 166         default:
 167                 return in_le32(rb->base + (reg >> 2));
 168         }
 169 }
 170
 171 static inline void _mpic_write(enum mpic_reg_type type,
 172                                struct mpic_reg_bank *rb,
 173                                unsigned int reg, u32 value)
 174 {
 175         switch(type) {
 176 #ifdef CONFIG_PPC_DCR
 177         case mpic_access_dcr:
 178                 dcr_write(rb->dhost, reg, value);
 179                 break;
 180 #endif
 181         case mpic_access_mmio_be:
 182                 out_be32(rb->base + (reg >> 2), value);
 183                 break;
 184         case mpic_access_mmio_le:
 185         default:
 186                 out_le32(rb->base + (reg >> 2), value);
 187                 break;
 188         }
 189 }
 190
 191 static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi)
 192 {
 193         enum mpic_reg_type type = mpic->reg_type;
 194         unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
 195                               (ipi * MPIC_INFO(GREG_IPI_STRIDE));
 196
 197         if ((mpic->flags & MPIC_BROKEN_IPI) && type == mpic_access_mmio_le)
 198                 type = mpic_access_mmio_be;
 199         return _mpic_read(type, &mpic->gregs, offset);
 200 }
 201
 202 static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value)
 203 {
 204         unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
 205                               (ipi * MPIC_INFO(GREG_IPI_STRIDE));
 206
 207         _mpic_write(mpic->reg_type, &mpic->gregs, offset, value);
 208 }
 209
 210 static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
 211 {
 212         unsigned int cpu = 0;
 213
 214         if (mpic->flags & MPIC_PRIMARY)
 215                 cpu = hard_smp_processor_id();
 216         return _mpic_read(mpic->reg_type, &mpic->cpuregs[cpu], reg);
 217 }
 218
 219 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
 220 {
 221         unsigned int cpu = 0;
 222
 223         if (mpic->flags & MPIC_PRIMARY)
 224                 cpu = hard_smp_processor_id();
 225
 226         _mpic_write(mpic->reg_type, &mpic->cpuregs[cpu], reg, value);
 227 }
 228
 229 static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg)
 230 {
 231         unsigned int    isu = src_no >> mpic->isu_shift;
 232         unsigned int    idx = src_no & mpic->isu_mask;
 233
 234 #ifdef CONFIG_MPIC_BROKEN_REGREAD
 235         if (reg == 0)
 236                 return mpic->isu_reg0_shadow[idx];
 237         else
 238 #endif
 239                 return _mpic_read(mpic->reg_type, &mpic->isus[isu],
 240                                   reg + (idx * MPIC_INFO(IRQ_STRIDE)));
 241 }
 242
 243 static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no,
 244                                    unsigned int reg, u32 value)
 245 {
 246         unsigned int    isu = src_no >> mpic->isu_shift;
 247         unsigned int    idx = src_no & mpic->isu_mask;
 248
 249         _mpic_write(mpic->reg_type, &mpic->isus[isu],
 250                     reg + (idx * MPIC_INFO(IRQ_STRIDE)), value);
 251
 252 #ifdef CONFIG_MPIC_BROKEN_REGREAD
 253         if (reg == 0)
 254                 mpic->isu_reg0_shadow[idx] = value;
 255 #endif
 256 }
 257
 258 #define mpic_read(b,r)          _mpic_read(mpic->reg_type,&(b),(r))
 259 #define mpic_write(b,r,v)       _mpic_write(mpic->reg_type,&(b),(r),(v))
 260 #define mpic_ipi_read(i)        _mpic_ipi_read(mpic,(i))
 261 #define mpic_ipi_write(i,v)     _mpic_ipi_write(mpic,(i),(v))
 262 #define mpic_cpu_read(i)        _mpic_cpu_read(mpic,(i))
 263 #define mpic_cpu_write(i,v)     _mpic_cpu_write(mpic,(i),(v))
 264 #define mpic_irq_read(s,r)      _mpic_irq_read(mpic,(s),(r))
 265 #define mpic_irq_write(s,r,v)   _mpic_irq_write(mpic,(s),(r),(v))
 266
 267
 268 /*
 269  * Low level utility functions
 270  */
 271
 272
 273 static void _mpic_map_mmio(struct mpic *mpic, phys_addr_t phys_addr,
 274                            struct mpic_reg_bank *rb, unsigned int offset,
 275                            unsigned int size)
 276 {
 277         rb->base = ioremap(phys_addr + offset, size);
 278         BUG_ON(rb->base == NULL);
 279 }
 280
 281 #ifdef CONFIG_PPC_DCR
 282 static void _mpic_map_dcr(struct mpic *mpic, struct mpic_reg_bank *rb,
 283                           unsigned int offset, unsigned int size)
 284 {
 285         const u32 *dbasep;
 286
 287         dbasep = of_get_property(mpic->irqhost->of_node, "dcr-reg", NULL);
 288
 289         rb->dhost = dcr_map(mpic->irqhost->of_node, *dbasep + offset, size);
 290         BUG_ON(!DCR_MAP_OK(rb->dhost));
 291 }
 292
 293 static inline void mpic_map(struct mpic *mpic, phys_addr_t phys_addr,
 294                             struct mpic_reg_bank *rb, unsigned int offset,
 295                             unsigned int size)
 296 {
 297         if (mpic->flags & MPIC_USES_DCR)
 298                 _mpic_map_dcr(mpic, rb, offset, size);
 299         else
 300                 _mpic_map_mmio(mpic, phys_addr, rb, offset, size);
 301 }
 302 #else /* CONFIG_PPC_DCR */
 303 #define mpic_map(m,p,b,o,s)     _mpic_map_mmio(m,p,b,o,s)
 304 #endif /* !CONFIG_PPC_DCR */
 305
 306
 307
 308 /* Check if we have one of those nice broken MPICs with a flipped endian on
 309  * reads from IPI registers
 310  */
 311 static void __init mpic_test_broken_ipi(struct mpic *mpic)
 312 {
 313         u32 r;
 314
 315         mpic_write(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0), MPIC_VECPRI_MASK);
 316         r = mpic_read(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0));
 317
 318         if (r == le32_to_cpu(MPIC_VECPRI_MASK)) {
 319                 printk(KERN_INFO "mpic: Detected reversed IPI registers\n");
 320                 mpic->flags |= MPIC_BROKEN_IPI;
 321         }
 322 }
 323
 324 #ifdef CONFIG_MPIC_U3_HT_IRQS
 325
 326 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
 327  * to force the edge setting on the MPIC and do the ack workaround.
 328  */
 329 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
 330 {
 331         if (source >= 128 || !mpic->fixups)
 332                 return 0;
 333         return mpic->fixups[source].base != NULL;
 334 }
 335
 336
 337 static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source)
 338 {
 339         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
 340
 341         if (fixup->applebase) {
 342                 unsigned int soff = (fixup->index >> 3) & ~3;
 343                 unsigned int mask = 1U << (fixup->index & 0x1f);
 344                 writel(mask, fixup->applebase + soff);
 345         } else {
 346                 spin_lock(&mpic->fixup_lock);
 347                 writeb(0x11 + 2 * fixup->index, fixup->base + 2);
 348                 writel(fixup->data, fixup->base + 4);
 349                 spin_unlock(&mpic->fixup_lock);
 350         }
 351 }
 352
 353 static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source,
 354                                       unsigned int irqflags)
 355 {
 356         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
 357         unsigned long flags;
 358         u32 tmp;
 359
 360         if (fixup->base == NULL)
 361                 return;
 362
 363         DBG("startup_ht_interrupt(0x%x, 0x%x) index: %d\n",
 364             source, irqflags, fixup->index);
 365         spin_lock_irqsave(&mpic->fixup_lock, flags);
 366         /* Enable and configure */
 367         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
 368         tmp = readl(fixup->base + 4);
 369         tmp &= ~(0x23U);
 370         if (irqflags & IRQ_LEVEL)
 371                 tmp |= 0x22;
 372         writel(tmp, fixup->base + 4);
 373         spin_unlock_irqrestore(&mpic->fixup_lock, flags);
 374
 375 #ifdef CONFIG_PM
 376         /* use the lowest bit inverted to the actual HW,
 377          * set if this fixup was enabled, clear otherwise */
 378         mpic->save_data[source].fixup_data = tmp | 1;
 379 #endif
 380 }
 381
 382 static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source,
 383                                        unsigned int irqflags)
 384 {
 385         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
 386         unsigned long flags;
 387         u32 tmp;
 388
 389         if (fixup->base == NULL)
 390                 return;
 391
 392         DBG("shutdown_ht_interrupt(0x%x, 0x%x)\n", source, irqflags);
 393
 394         /* Disable */
 395         spin_lock_irqsave(&mpic->fixup_lock, flags);
 396         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
 397         tmp = readl(fixup->base + 4);
 398         tmp |= 1;
 399         writel(tmp, fixup->base + 4);
 400         spin_unlock_irqrestore(&mpic->fixup_lock, flags);
 401
 402 #ifdef CONFIG_PM
 403         /* use the lowest bit inverted to the actual HW,
 404          * set if this fixup was enabled, clear otherwise */
 405         mpic->save_data[source].fixup_data = tmp & ~1;
 406 #endif
 407 }
 408
 409 #ifdef CONFIG_PCI_MSI
 410 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
 411                                     unsigned int devfn)
 412 {
 413         u8 __iomem *base;
 414         u8 pos, flags;
 415         u64 addr = 0;
 416
 417         for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
 418              pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
 419                 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
 420                 if (id == PCI_CAP_ID_HT) {
 421                         id = readb(devbase + pos + 3);
 422                         if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_MSI_MAPPING)
 423                                 break;
 424                 }
 425         }
 426
 427         if (pos == 0)
 428                 return;
 429
 430         base = devbase + pos;
 431
 432         flags = readb(base + HT_MSI_FLAGS);
 433         if (!(flags & HT_MSI_FLAGS_FIXED)) {
 434                 addr = readl(base + HT_MSI_ADDR_LO) & HT_MSI_ADDR_LO_MASK;
 435                 addr = addr | ((u64)readl(base + HT_MSI_ADDR_HI) << 32);
 436         }
 437
 438         printk(KERN_DEBUG "mpic:   - HT:%02x.%x %s MSI mapping found @ 0x%llx\n",
 439                 PCI_SLOT(devfn), PCI_FUNC(devfn),
 440                 flags & HT_MSI_FLAGS_ENABLE ? "enabled" : "disabled", addr);
 441
 442         if (!(flags & HT_MSI_FLAGS_ENABLE))
 443                 writeb(flags | HT_MSI_FLAGS_ENABLE, base + HT_MSI_FLAGS);
 444 }
 445 #else
 446 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
 447                                     unsigned int devfn)
 448 {
 449         return;
 450 }
 451 #endif
 452
 453 static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
 454                                     unsigned int devfn, u32 vdid)
 455 {
 456         int i, irq, n;
 457         u8 __iomem *base;
 458         u32 tmp;
 459         u8 pos;
 460
 461         for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
 462              pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
 463                 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
 464                 if (id == PCI_CAP_ID_HT) {
 465                         id = readb(devbase + pos + 3);
 466                         if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_IRQ)
 467                                 break;
 468                 }
 469         }
 470         if (pos == 0)
 471                 return;
 472
 473         base = devbase + pos;
 474         writeb(0x01, base + 2);
 475         n = (readl(base + 4) >> 16) & 0xff;
 476
 477         printk(KERN_INFO "mpic:   - HT:%02x.%x [0x%02x] vendor %04x device %04x"
 478                " has %d irqs\n",
 479                devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1);
 480
 481         for (i = 0; i <= n; i++) {
 482                 writeb(0x10 + 2 * i, base + 2);
 483                 tmp = readl(base + 4);
 484                 irq = (tmp >> 16) & 0xff;
 485                 DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp);
 486                 /* mask it , will be unmasked later */
 487                 tmp |= 0x1;
 488                 writel(tmp, base + 4);
 489                 mpic->fixups[irq].index = i;
 490                 mpic->fixups[irq].base = base;
 491                 /* Apple HT PIC has a non-standard way of doing EOIs */
 492                 if ((vdid & 0xffff) == 0x106b)
 493                         mpic->fixups[irq].applebase = devbase + 0x60;
 494                 else
 495                         mpic->fixups[irq].applebase = NULL;
 496                 writeb(0x11 + 2 * i, base + 2);
 497                 mpic->fixups[irq].data = readl(base + 4) | 0x80000000;
 498         }
 499 }
 500
 501
 502 static void __init mpic_scan_ht_pics(struct mpic *mpic)
 503 {
 504         unsigned int devfn;
 505         u8 __iomem *cfgspace;
 506
 507         printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n");
 508
 509         /* Allocate fixups array */
 510         mpic->fixups = alloc_bootmem(128 * sizeof(struct mpic_irq_fixup));
 511         BUG_ON(mpic->fixups == NULL);
 512         memset(mpic->fixups, 0, 128 * sizeof(struct mpic_irq_fixup));
 513
 514         /* Init spinlock */
 515         spin_lock_init(&mpic->fixup_lock);
 516
 517         /* Map U3 config space. We assume all IO-APICs are on the primary bus
 518          * so we only need to map 64kB.
 519          */
 520         cfgspace = ioremap(0xf2000000, 0x10000);
 521         BUG_ON(cfgspace == NULL);
 522
 523         /* Now we scan all slots. We do a very quick scan, we read the header
 524          * type, vendor ID and device ID only, that's plenty enough
 525          */
 526         for (devfn = 0; devfn < 0x100; devfn++) {
 527                 u8 __iomem *devbase = cfgspace + (devfn << 8);
 528                 u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
 529                 u32 l = readl(devbase + PCI_VENDOR_ID);
 530                 u16 s;
 531
 532                 DBG("devfn %x, l: %x\n", devfn, l);
 533
 534                 /* If no device, skip */
 535                 if (l == 0xffffffff || l == 0x00000000 ||
 536                     l == 0x0000ffff || l == 0xffff0000)
 537                         goto next;
 538                 /* Check if is supports capability lists */
 539                 s = readw(devbase + PCI_STATUS);
 540                 if (!(s & PCI_STATUS_CAP_LIST))
 541                         goto next;
 542
 543                 mpic_scan_ht_pic(mpic, devbase, devfn, l);
 544                 mpic_scan_ht_msi(mpic, devbase, devfn);
 545
 546         next:
 547                 /* next device, if function 0 */
 548                 if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0)
 549                         devfn += 7;
 550         }
 551 }
 552
 553 #else /* CONFIG_MPIC_U3_HT_IRQS */
 554
 555 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
 556 {
 557         return 0;
 558 }
 559
 560 static void __init mpic_scan_ht_pics(struct mpic *mpic)
 561 {
 562 }
 563
 564 #endif /* CONFIG_MPIC_U3_HT_IRQS */
 565
 566 #ifdef CONFIG_SMP
 567 static int irq_choose_cpu(unsigned int virt_irq)
 568 {
 569         cpumask_t mask;
 570         int cpuid;
 571
 572         cpumask_copy(&mask, irq_desc[virt_irq].affinity);
 573         if (cpus_equal(mask, CPU_MASK_ALL)) {
 574                 static int irq_rover;
 575                 static DEFINE_SPINLOCK(irq_rover_lock);
 576                 unsigned long flags;
 577
 578                 /* Round-robin distribution... */
 579         do_round_robin:
 580                 spin_lock_irqsave(&irq_rover_lock, flags);
 581
 582                 while (!cpu_online(irq_rover)) {
 583                         if (++irq_rover >= NR_CPUS)
 584                                 irq_rover = 0;
 585                 }
 586                 cpuid = irq_rover;
 587                 do {
 588                         if (++irq_rover >= NR_CPUS)
 589                                 irq_rover = 0;
 590                 } while (!cpu_online(irq_rover));
 591
 592                 spin_unlock_irqrestore(&irq_rover_lock, flags);
 593         } else {
 594                 cpumask_t tmp;
 595
 596                 cpus_and(tmp, cpu_online_map, mask);
 597
 598                 if (cpus_empty(tmp))
 599                         goto do_round_robin;
 600
 601                 cpuid = first_cpu(tmp);
 602         }
 603
 604         return get_hard_smp_processor_id(cpuid);
 605 }
 606 #else
 607 static int irq_choose_cpu(unsigned int virt_irq)
 608 {
 609         return hard_smp_processor_id();
 610 }
 611 #endif
 612
 613 #define mpic_irq_to_hw(virq)    ((unsigned int)irq_map[virq].hwirq)
 614
 615 /* Find an mpic associated with a given linux interrupt */
 616 static struct mpic *mpic_find(unsigned int irq, unsigned int *is_ipi)
 617 {
 618         unsigned int src = mpic_irq_to_hw(irq);
 619         struct mpic *mpic;
 620
 621         if (irq < NUM_ISA_INTERRUPTS)
 622                 return NULL;
 623
 624         mpic = irq_desc[irq].chip_data;
 625
 626         if (is_ipi)
 627                 *is_ipi = (src >= mpic->ipi_vecs[0] &&
 628                            src <= mpic->ipi_vecs[3]);
 629
 630         return mpic;
 631 }
 632
 633 /* Convert a cpu mask from logical to physical cpu numbers. */
 634 static inline u32 mpic_physmask(u32 cpumask)
 635 {
 636         int i;
 637         u32 mask = 0;
 638
 639         for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1)
 640                 mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
 641         return mask;
 642 }
 643
 644 #ifdef CONFIG_SMP
 645 /* Get the mpic structure from the IPI number */
 646 static inline struct mpic * mpic_from_ipi(unsigned int ipi)
 647 {
 648         return irq_desc[ipi].chip_data;
 649 }
 650 #endif
 651
 652 /* Get the mpic structure from the irq number */
 653 static inline struct mpic * mpic_from_irq(unsigned int irq)
 654 {
 655         return irq_desc[irq].chip_data;
 656 }
 657
 658 /* Send an EOI */
 659 static inline void mpic_eoi(struct mpic *mpic)
 660 {
 661         mpic_cpu_write(MPIC_INFO(CPU_EOI), 0);
 662         (void)mpic_cpu_read(MPIC_INFO(CPU_WHOAMI));
 663 }
 664
 665 /*
 666  * Linux descriptor level callbacks
 667  */
 668
 669
 670 void mpic_unmask_irq(unsigned int irq)
 671 {
 672         unsigned int loops = 100000;
 673         struct mpic *mpic = mpic_from_irq(irq);
 674         unsigned int src = mpic_irq_to_hw(irq);
 675
 676         DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, irq, src);
 677
 678         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
 679                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) &
 680                        ~MPIC_VECPRI_MASK);
 681         /* make sure mask gets to controller before we return to user */
 682         do {
 683                 if (!loops--) {
 684                         printk(KERN_ERR "mpic_enable_irq timeout\n");
 685                         break;
 686                 }
 687         } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK);
 688 }
 689
 690 void mpic_mask_irq(unsigned int irq)
 691 {
 692         unsigned int loops = 100000;
 693         struct mpic *mpic = mpic_from_irq(irq);
 694         unsigned int src = mpic_irq_to_hw(irq);
 695
 696         DBG("%s: disable_irq: %d (src %d)\n", mpic->name, irq, src);
 697
 698         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
 699                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) |
 700                        MPIC_VECPRI_MASK);
 701
 702         /* make sure mask gets to controller before we return to user */
 703         do {
 704                 if (!loops--) {
 705                         printk(KERN_ERR "mpic_enable_irq timeout\n");
 706                         break;
 707                 }
 708         } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK));
 709 }
 710
 711 void mpic_end_irq(unsigned int irq)
 712 {
 713         struct mpic *mpic = mpic_from_irq(irq);
 714
 715 #ifdef DEBUG_IRQ
 716         DBG("%s: end_irq: %d\n", mpic->name, irq);
 717 #endif
 718         /* We always EOI on end_irq() even for edge interrupts since that
 719          * should only lower the priority, the MPIC should have properly
 720          * latched another edge interrupt coming in anyway
 721          */
 722
 723         mpic_eoi(mpic);
 724 }
 725
 726 #ifdef CONFIG_MPIC_U3_HT_IRQS
 727
 728 static void mpic_unmask_ht_irq(unsigned int irq)
 729 {
 730         struct mpic *mpic = mpic_from_irq(irq);
 731         unsigned int src = mpic_irq_to_hw(irq);
 732
 733         mpic_unmask_irq(irq);
 734
 735         if (irq_desc[irq].status & IRQ_LEVEL)
 736                 mpic_ht_end_irq(mpic, src);
 737 }
 738
 739 static unsigned int mpic_startup_ht_irq(unsigned int irq)
 740 {
 741         struct mpic *mpic = mpic_from_irq(irq);
 742         unsigned int src = mpic_irq_to_hw(irq);
 743
 744         mpic_unmask_irq(irq);
 745         mpic_startup_ht_interrupt(mpic, src, irq_desc[irq].status);
 746
 747         return 0;
 748 }
 749
 750 static void mpic_shutdown_ht_irq(unsigned int irq)
 751 {
 752         struct mpic *mpic = mpic_from_irq(irq);
 753         unsigned int src = mpic_irq_to_hw(irq);
 754
 755         mpic_shutdown_ht_interrupt(mpic, src, irq_desc[irq].status);
 756         mpic_mask_irq(irq);
 757 }
 758
 759 static void mpic_end_ht_irq(unsigned int irq)
 760 {
 761         struct mpic *mpic = mpic_from_irq(irq);
 762         unsigned int src = mpic_irq_to_hw(irq);
 763
 764 #ifdef DEBUG_IRQ
 765         DBG("%s: end_irq: %d\n", mpic->name, irq);
 766 #endif
 767         /* We always EOI on end_irq() even for edge interrupts since that
 768          * should only lower the priority, the MPIC should have properly
 769          * latched another edge interrupt coming in anyway
 770          */
 771
 772         if (irq_desc[irq].status & IRQ_LEVEL)
 773                 mpic_ht_end_irq(mpic, src);
 774         mpic_eoi(mpic);
 775 }
 776 #endif /* !CONFIG_MPIC_U3_HT_IRQS */
 777
 778 #ifdef CONFIG_SMP
 779
 780 static void mpic_unmask_ipi(unsigned int irq)
 781 {
 782         struct mpic *mpic = mpic_from_ipi(irq);
 783         unsigned int src = mpic_irq_to_hw(irq) - mpic->ipi_vecs[0];
 784
 785         DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, irq, src);
 786         mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
 787 }
 788
 789 static void mpic_mask_ipi(unsigned int irq)
 790 {
 791         /* NEVER disable an IPI... that's just plain wrong! */
 792 }
 793
 794 static void mpic_end_ipi(unsigned int irq)
 795 {
 796         struct mpic *mpic = mpic_from_ipi(irq);
 797
 798         /*
 799          * IPIs are marked IRQ_PER_CPU. This has the side effect of
 800          * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
 801          * applying to them. We EOI them late to avoid re-entering.
 802          * We mark IPI's with IRQF_DISABLED as they must run with
 803          * irqs disabled.
 804          */
 805         mpic_eoi(mpic);
 806 }
 807
 808 #endif /* CONFIG_SMP */
 809
 810 void mpic_set_affinity(unsigned int irq, const struct cpumask *cpumask)
 811 {
 812         struct mpic *mpic = mpic_from_irq(irq);
 813         unsigned int src = mpic_irq_to_hw(irq);
 814
 815         if (mpic->flags & MPIC_SINGLE_DEST_CPU) {
 816                 int cpuid = irq_choose_cpu(irq);
 817
 818                 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
 819         } else {
 820                 cpumask_t tmp;
 821
 822                 cpumask_and(&tmp, cpumask, cpu_online_mask);
 823
 824                 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION),
 825                                mpic_physmask(cpus_addr(tmp)[0]));
 826         }
 827 }
 828
 829 static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type)
 830 {
 831         /* Now convert sense value */
 832         switch(type & IRQ_TYPE_SENSE_MASK) {
 833         case IRQ_TYPE_EDGE_RISING:
 834                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
 835                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
 836         case IRQ_TYPE_EDGE_FALLING:
 837         case IRQ_TYPE_EDGE_BOTH:
 838                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
 839                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
 840         case IRQ_TYPE_LEVEL_HIGH:
 841                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
 842                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
 843         case IRQ_TYPE_LEVEL_LOW:
 844         default:
 845                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
 846                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
 847         }
 848 }
 849
 850 int mpic_set_irq_type(unsigned int virq, unsigned int flow_type)
 851 {
 852         struct mpic *mpic = mpic_from_irq(virq);
 853         unsigned int src = mpic_irq_to_hw(virq);
 854         struct irq_desc *desc = get_irq_desc(virq);
 855         unsigned int vecpri, vold, vnew;
 856
 857         DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n",
 858             mpic, virq, src, flow_type);
 859
 860         if (src >= mpic->irq_count)
 861                 return -EINVAL;
 862
 863         if (flow_type == IRQ_TYPE_NONE)
 864                 if (mpic->senses && src < mpic->senses_count)
 865                         flow_type = mpic->senses[src];
 866         if (flow_type == IRQ_TYPE_NONE)
 867                 flow_type = IRQ_TYPE_LEVEL_LOW;
 868
 869         desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
 870         desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
 871         if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
 872                 desc->status |= IRQ_LEVEL;
 873
 874         if (mpic_is_ht_interrupt(mpic, src))
 875                 vecpri = MPIC_VECPRI_POLARITY_POSITIVE |
 876                         MPIC_VECPRI_SENSE_EDGE;
 877         else
 878                 vecpri = mpic_type_to_vecpri(mpic, flow_type);
 879
 880         vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
 881         vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) |
 882                         MPIC_INFO(VECPRI_SENSE_MASK));
 883         vnew |= vecpri;
 884         if (vold != vnew)
 885                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew);
 886
 887         return 0;
 888 }
 889
 890 void mpic_set_vector(unsigned int virq, unsigned int vector)
 891 {
 892         struct mpic *mpic = mpic_from_irq(virq);
 893         unsigned int src = mpic_irq_to_hw(virq);
 894         unsigned int vecpri;
 895
 896         DBG("mpic: set_vector(mpic:@%p,virq:%d,src:%d,vector:0x%x)\n",
 897             mpic, virq, src, vector);
 898
 899         if (src >= mpic->irq_count)
 900                 return;
 901
 902         vecpri = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
 903         vecpri = vecpri & ~MPIC_INFO(VECPRI_VECTOR_MASK);
 904         vecpri |= vector;
 905         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
 906 }
 907
 908 static struct irq_chip mpic_irq_chip = {
 909         .mask           = mpic_mask_irq,
 910         .unmask         = mpic_unmask_irq,
 911         .eoi            = mpic_end_irq,
 912         .set_type       = mpic_set_irq_type,
 913 };
 914
 915 #ifdef CONFIG_SMP
 916 static struct irq_chip mpic_ipi_chip = {
 917         .mask           = mpic_mask_ipi,
 918         .unmask         = mpic_unmask_ipi,
 919         .eoi            = mpic_end_ipi,
 920 };
 921 #endif /* CONFIG_SMP */
 922
 923 #ifdef CONFIG_MPIC_U3_HT_IRQS
 924 static struct irq_chip mpic_irq_ht_chip = {
 925         .startup        = mpic_startup_ht_irq,
 926         .shutdown       = mpic_shutdown_ht_irq,
 927         .mask           = mpic_mask_irq,
 928         .unmask         = mpic_unmask_ht_irq,
 929         .eoi            = mpic_end_ht_irq,
 930         .set_type       = mpic_set_irq_type,
 931 };
 932 #endif /* CONFIG_MPIC_U3_HT_IRQS */
 933
 934
 935 static int mpic_host_match(struct irq_host *h, struct device_node *node)
 936 {
 937         /* Exact match, unless mpic node is NULL */
 938         return h->of_node == NULL || h->of_node == node;
 939 }
 940
 941 static int mpic_host_map(struct irq_host *h, unsigned int virq,
 942                          irq_hw_number_t hw)
 943 {
 944         struct mpic *mpic = h->host_data;
 945         struct irq_chip *chip;
 946
 947         DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw);
 948
 949         if (hw == mpic->spurious_vec)
 950                 return -EINVAL;
 951         if (mpic->protected && test_bit(hw, mpic->protected))
 952                 return -EINVAL;
 953
 954 #ifdef CONFIG_SMP
 955         else if (hw >= mpic->ipi_vecs[0]) {
 956                 WARN_ON(!(mpic->flags & MPIC_PRIMARY));
 957
 958                 DBG("mpic: mapping as IPI\n");
 959                 set_irq_chip_data(virq, mpic);
 960                 set_irq_chip_and_handler(virq, &mpic->hc_ipi,
 961                                          handle_percpu_irq);
 962                 return 0;
 963         }
 964 #endif /* CONFIG_SMP */
 965
 966         if (hw >= mpic->irq_count)
 967                 return -EINVAL;
 968
 969         mpic_msi_reserve_hwirq(mpic, hw);
 970
 971         /* Default chip */
 972         chip = &mpic->hc_irq;
 973
 974 #ifdef CONFIG_MPIC_U3_HT_IRQS
 975         /* Check for HT interrupts, override vecpri */
 976         if (mpic_is_ht_interrupt(mpic, hw))
 977                 chip = &mpic->hc_ht_irq;
 978 #endif /* CONFIG_MPIC_U3_HT_IRQS */
 979
 980         DBG("mpic: mapping to irq chip @%p\n", chip);
 981
 982         set_irq_chip_data(virq, mpic);
 983         set_irq_chip_and_handler(virq, chip, handle_fasteoi_irq);
 984
 985         /* Set default irq type */
 986         set_irq_type(virq, IRQ_TYPE_NONE);
 987
 988         return 0;
 989 }
 990
 991 static int mpic_host_xlate(struct irq_host *h, struct device_node *ct,
 992                            u32 *intspec, unsigned int intsize,
 993                            irq_hw_number_t *out_hwirq, unsigned int *out_flags)
 994
 995 {
 996         static unsigned char map_mpic_senses[4] = {
 997                 IRQ_TYPE_EDGE_RISING,
 998                 IRQ_TYPE_LEVEL_LOW,
 999                 IRQ_TYPE_LEVEL_HIGH,
1000                 IRQ_TYPE_EDGE_FALLING,
1001         };
1002
1003         *out_hwirq = intspec[0];
1004         if (intsize > 1) {
1005                 u32 mask = 0x3;
1006
1007                 /* Apple invented a new race of encoding on machines with
1008                  * an HT APIC. They encode, among others, the index within
1009                  * the HT APIC. We don't care about it here since thankfully,
1010                  * it appears that they have the APIC already properly
1011                  * configured, and thus our current fixup code that reads the
1012                  * APIC config works fine. However, we still need to mask out
1013                  * bits in the specifier to make sure we only get bit 0 which
1014                  * is the level/edge bit (the only sense bit exposed by Apple),
1015                  * as their bit 1 means something else.
1016                  */
1017                 if (machine_is(powermac))
1018                         mask = 0x1;
1019                 *out_flags = map_mpic_senses[intspec[1] & mask];
1020         } else
1021                 *out_flags = IRQ_TYPE_NONE;
1022
1023         DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
1024             intsize, intspec[0], intspec[1], *out_hwirq, *out_flags);
1025
1026         return 0;
1027 }
1028
1029 static struct irq_host_ops mpic_host_ops = {
1030         .match = mpic_host_match,
1031         .map = mpic_host_map,
1032         .xlate = mpic_host_xlate,
1033 };
1034
1035 /*
1036  * Exported functions
1037  */
1038
1039 struct mpic * __init mpic_alloc(struct device_node *node,
1040                                 phys_addr_t phys_addr,
1041                                 unsigned int flags,
1042                                 unsigned int isu_size,
1043                                 unsigned int irq_count,
1044                                 const char *name)
1045 {
1046         struct mpic     *mpic;
1047         u32             greg_feature;
1048         const char      *vers;
1049         int             i;
1050         int             intvec_top;
1051         u64             paddr = phys_addr;
1052
1053         mpic = alloc_bootmem(sizeof(struct mpic));
1054         if (mpic == NULL)
1055                 return NULL;
1056
1057         memset(mpic, 0, sizeof(struct mpic));
1058         mpic->name = name;
1059
1060         mpic->hc_irq = mpic_irq_chip;
1061         mpic->hc_irq.typename = name;
1062         if (flags & MPIC_PRIMARY)
1063                 mpic->hc_irq.set_affinity = mpic_set_affinity;
1064 #ifdef CONFIG_MPIC_U3_HT_IRQS
1065         mpic->hc_ht_irq = mpic_irq_ht_chip;
1066         mpic->hc_ht_irq.typename = name;
1067         if (flags & MPIC_PRIMARY)
1068                 mpic->hc_ht_irq.set_affinity = mpic_set_affinity;
1069 #endif /* CONFIG_MPIC_U3_HT_IRQS */
1070
1071 #ifdef CONFIG_SMP
1072         mpic->hc_ipi = mpic_ipi_chip;
1073         mpic->hc_ipi.typename = name;
1074 #endif /* CONFIG_SMP */
1075
1076         mpic->flags = flags;
1077         mpic->isu_size = isu_size;
1078         mpic->irq_count = irq_count;
1079         mpic->num_sources = 0; /* so far */
1080
1081         if (flags & MPIC_LARGE_VECTORS)
1082                 intvec_top = 2047;
1083         else
1084                 intvec_top = 255;
1085
1086         mpic->timer_vecs[0] = intvec_top - 8;
1087         mpic->timer_vecs[1] = intvec_top - 7;
1088         mpic->timer_vecs[2] = intvec_top - 6;
1089         mpic->timer_vecs[3] = intvec_top - 5;
1090         mpic->ipi_vecs[0]   = intvec_top - 4;
1091         mpic->ipi_vecs[1]   = intvec_top - 3;
1092         mpic->ipi_vecs[2]   = intvec_top - 2;
1093         mpic->ipi_vecs[3]   = intvec_top - 1;
1094         mpic->spurious_vec  = intvec_top;
1095
1096         /* Check for "big-endian" in device-tree */
1097         if (node && of_get_property(node, "big-endian", NULL) != NULL)
1098                 mpic->flags |= MPIC_BIG_ENDIAN;
1099
1100         /* Look for protected sources */
1101         if (node) {
1102                 int psize;
1103                 unsigned int bits, mapsize;
1104                 const u32 *psrc =
1105                         of_get_property(node, "protected-sources", &psize);
1106                 if (psrc) {
1107                         psize /= 4;
1108                         bits = intvec_top + 1;
1109                         mapsize = BITS_TO_LONGS(bits) * sizeof(unsigned long);
1110                         mpic->protected = alloc_bootmem(mapsize);
1111                         BUG_ON(mpic->protected == NULL);
1112                         memset(mpic->protected, 0, mapsize);
1113                         for (i = 0; i < psize; i++) {
1114                                 if (psrc[i] > intvec_top)
1115                                         continue;
1116                                 __set_bit(psrc[i], mpic->protected);
1117                         }
1118                 }
1119         }
1120
1121 #ifdef CONFIG_MPIC_WEIRD
1122         mpic->hw_set = mpic_infos[MPIC_GET_REGSET(flags)];
1123 #endif
1124
1125         /* default register type */
1126         mpic->reg_type = (flags & MPIC_BIG_ENDIAN) ?
1127                 mpic_access_mmio_be : mpic_access_mmio_le;
1128
1129         /* If no physical address is passed in, a device-node is mandatory */
1130         BUG_ON(paddr == 0 && node == NULL);
1131
1132         /* If no physical address passed in, check if it's dcr based */
1133         if (paddr == 0 && of_get_property(node, "dcr-reg", NULL) != NULL) {
1134 #ifdef CONFIG_PPC_DCR
1135                 mpic->flags |= MPIC_USES_DCR;
1136                 mpic->reg_type = mpic_access_dcr;
1137 #else
1138                 BUG();
1139 #endif /* CONFIG_PPC_DCR */
1140         }
1141
1142         /* If the MPIC is not DCR based, and no physical address was passed
1143          * in, try to obtain one
1144          */
1145         if (paddr == 0 && !(mpic->flags & MPIC_USES_DCR)) {
1146                 const u32 *reg = of_get_property(node, "reg", NULL);
1147                 BUG_ON(reg == NULL);
1148                 paddr = of_translate_address(node, reg);
1149                 BUG_ON(paddr == OF_BAD_ADDR);
1150         }
1151
1152         /* Map the global registers */
1153         mpic_map(mpic, paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
1154         mpic_map(mpic, paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
1155
1156         /* Reset */
1157         if (flags & MPIC_WANTS_RESET) {
1158                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1159                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1160                            | MPIC_GREG_GCONF_RESET);
1161                 while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1162                        & MPIC_GREG_GCONF_RESET)
1163                         mb();
1164         }
1165
1166         /* CoreInt */
1167         if (flags & MPIC_ENABLE_COREINT)
1168                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1169                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1170                            | MPIC_GREG_GCONF_COREINT);
1171
1172         if (flags & MPIC_ENABLE_MCK)
1173                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1174                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1175                            | MPIC_GREG_GCONF_MCK);
1176
1177         /* Read feature register, calculate num CPUs and, for non-ISU
1178          * MPICs, num sources as well. On ISU MPICs, sources are counted
1179          * as ISUs are added
1180          */
1181         greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
1182         mpic->num_cpus = ((greg_feature & MPIC_GREG_FEATURE_LAST_CPU_MASK)
1183                           >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
1184         if (isu_size == 0) {
1185                 if (flags & MPIC_BROKEN_FRR_NIRQS)
1186                         mpic->num_sources = mpic->irq_count;
1187                 else
1188                         mpic->num_sources =
1189                                 ((greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
1190                                  >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
1191         }
1192
1193         /* Map the per-CPU registers */
1194         for (i = 0; i < mpic->num_cpus; i++) {
1195                 mpic_map(mpic, paddr, &mpic->cpuregs[i],
1196                          MPIC_INFO(CPU_BASE) + i * MPIC_INFO(CPU_STRIDE),
1197                          0x1000);
1198         }
1199
1200         /* Initialize main ISU if none provided */
1201         if (mpic->isu_size == 0) {
1202                 mpic->isu_size = mpic->num_sources;
1203                 mpic_map(mpic, paddr, &mpic->isus[0],
1204                          MPIC_INFO(IRQ_BASE), MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1205         }
1206         mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
1207         mpic->isu_mask = (1 << mpic->isu_shift) - 1;
1208
1209         mpic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
1210                                        isu_size ? isu_size : mpic->num_sources,
1211                                        &mpic_host_ops,
1212                                        flags & MPIC_LARGE_VECTORS ? 2048 : 256);
1213         if (mpic->irqhost == NULL)
1214                 return NULL;
1215
1216         mpic->irqhost->host_data = mpic;
1217
1218         /* Display version */
1219         switch (greg_feature & MPIC_GREG_FEATURE_VERSION_MASK) {
1220         case 1:
1221                 vers = "1.0";
1222                 break;
1223         case 2:
1224                 vers = "1.2";
1225                 break;
1226         case 3:
1227                 vers = "1.3";
1228                 break;
1229         default:
1230                 vers = "<unknown>";
1231                 break;
1232         }
1233         printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx,"
1234                " max %d CPUs\n",
1235                name, vers, (unsigned long long)paddr, mpic->num_cpus);
1236         printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n",
1237                mpic->isu_size, mpic->isu_shift, mpic->isu_mask);
1238
1239         mpic->next = mpics;
1240         mpics = mpic;
1241
1242         if (flags & MPIC_PRIMARY) {
1243                 mpic_primary = mpic;
1244                 irq_set_default_host(mpic->irqhost);
1245         }
1246
1247         return mpic;
1248 }
1249
1250 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
1251                             phys_addr_t paddr)
1252 {
1253         unsigned int isu_first = isu_num * mpic->isu_size;
1254
1255         BUG_ON(isu_num >= MPIC_MAX_ISU);
1256
1257         mpic_map(mpic, paddr, &mpic->isus[isu_num], 0,
1258                  MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1259         if ((isu_first + mpic->isu_size) > mpic->num_sources)
1260                 mpic->num_sources = isu_first + mpic->isu_size;
1261 }
1262
1263 void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count)
1264 {
1265         mpic->senses = senses;
1266         mpic->senses_count = count;
1267 }
1268
1269 void __init mpic_init(struct mpic *mpic)
1270 {
1271         int i;
1272         int cpu;
1273
1274         BUG_ON(mpic->num_sources == 0);
1275
1276         printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
1277
1278         /* Set current processor priority to max */
1279         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1280
1281         /* Initialize timers: just disable them all */
1282         for (i = 0; i < 4; i++) {
1283                 mpic_write(mpic->tmregs,
1284                            i * MPIC_INFO(TIMER_STRIDE) +
1285                            MPIC_INFO(TIMER_DESTINATION), 0);
1286                 mpic_write(mpic->tmregs,
1287                            i * MPIC_INFO(TIMER_STRIDE) +
1288                            MPIC_INFO(TIMER_VECTOR_PRI),
1289                            MPIC_VECPRI_MASK |
1290                            (mpic->timer_vecs[0] + i));
1291         }
1292
1293         /* Initialize IPIs to our reserved vectors and mark them disabled for now */
1294         mpic_test_broken_ipi(mpic);
1295         for (i = 0; i < 4; i++) {
1296                 mpic_ipi_write(i,
1297                                MPIC_VECPRI_MASK |
1298                                (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
1299                                (mpic->ipi_vecs[0] + i));
1300         }
1301
1302         /* Initialize interrupt sources */
1303         if (mpic->irq_count == 0)
1304                 mpic->irq_count = mpic->num_sources;
1305
1306         /* Do the HT PIC fixups on U3 broken mpic */
1307         DBG("MPIC flags: %x\n", mpic->flags);
1308         if ((mpic->flags & MPIC_U3_HT_IRQS) && (mpic->flags & MPIC_PRIMARY)) {
1309                 mpic_scan_ht_pics(mpic);
1310                 mpic_u3msi_init(mpic);
1311         }
1312
1313         mpic_pasemi_msi_init(mpic);
1314
1315         if (mpic->flags & MPIC_PRIMARY)
1316                 cpu = hard_smp_processor_id();
1317         else
1318                 cpu = 0;
1319
1320         for (i = 0; i < mpic->num_sources; i++) {
1321                 /* start with vector = source number, and masked */
1322                 u32 vecpri = MPIC_VECPRI_MASK | i |
1323                         (8 << MPIC_VECPRI_PRIORITY_SHIFT);
1324
1325                 /* check if protected */
1326                 if (mpic->protected && test_bit(i, mpic->protected))
1327                         continue;
1328                 /* init hw */
1329                 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
1330                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1 << cpu);
1331         }
1332
1333         /* Init spurious vector */
1334         mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), mpic->spurious_vec);
1335
1336         /* Disable 8259 passthrough, if supported */
1337         if (!(mpic->flags & MPIC_NO_PTHROU_DIS))
1338                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1339                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1340                            | MPIC_GREG_GCONF_8259_PTHROU_DIS);
1341
1342         if (mpic->flags & MPIC_NO_BIAS)
1343                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1344                         mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1345                         | MPIC_GREG_GCONF_NO_BIAS);
1346
1347         /* Set current processor priority to 0 */
1348         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1349
1350 #ifdef CONFIG_PM
1351         /* allocate memory to save mpic state */
1352         mpic->save_data = alloc_bootmem(mpic->num_sources * sizeof(struct mpic_irq_save));
1353         BUG_ON(mpic->save_data == NULL);
1354 #endif
1355 }
1356
1357 void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)
1358 {
1359         u32 v;
1360
1361         v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1362         v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK;
1363         v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio);
1364         mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1365 }
1366
1367 void __init mpic_set_serial_int(struct mpic *mpic, int enable)
1368 {
1369         unsigned long flags;
1370         u32 v;
1371
1372         spin_lock_irqsave(&mpic_lock, flags);
1373         v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1374         if (enable)
1375                 v |= MPIC_GREG_GLOBAL_CONF_1_SIE;
1376         else
1377                 v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE;
1378         mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1379         spin_unlock_irqrestore(&mpic_lock, flags);
1380 }
1381
1382 void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
1383 {
1384         unsigned int is_ipi;
1385         struct mpic *mpic = mpic_find(irq, &is_ipi);
1386         unsigned int src = mpic_irq_to_hw(irq);
1387         unsigned long flags;
1388         u32 reg;
1389
1390         if (!mpic)
1391                 return;
1392
1393         spin_lock_irqsave(&mpic_lock, flags);
1394         if (is_ipi) {
1395                 reg = mpic_ipi_read(src - mpic->ipi_vecs[0]) &
1396                         ~MPIC_VECPRI_PRIORITY_MASK;
1397                 mpic_ipi_write(src - mpic->ipi_vecs[0],
1398                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1399         } else {
1400                 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI))
1401                         & ~MPIC_VECPRI_PRIORITY_MASK;
1402                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
1403                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1404         }
1405         spin_unlock_irqrestore(&mpic_lock, flags);
1406 }
1407
1408 void mpic_setup_this_cpu(void)
1409 {
1410 #ifdef CONFIG_SMP
1411         struct mpic *mpic = mpic_primary;
1412         unsigned long flags;
1413         u32 msk = 1 << hard_smp_processor_id();
1414         unsigned int i;
1415
1416         BUG_ON(mpic == NULL);
1417
1418         DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1419
1420         spin_lock_irqsave(&mpic_lock, flags);
1421
1422         /* let the mpic know we want intrs. default affinity is 0xffffffff
1423          * until changed via /proc. That's how it's done on x86. If we want
1424          * it differently, then we should make sure we also change the default
1425          * values of irq_desc[].affinity in irq.c.
1426          */
1427         if (distribute_irqs) {
1428                 for (i = 0; i < mpic->num_sources ; i++)
1429                         mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1430                                 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk);
1431         }
1432
1433         /* Set current processor priority to 0 */
1434         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1435
1436         spin_unlock_irqrestore(&mpic_lock, flags);
1437 #endif /* CONFIG_SMP */
1438 }
1439
1440 int mpic_cpu_get_priority(void)
1441 {
1442         struct mpic *mpic = mpic_primary;
1443
1444         return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI));
1445 }
1446
1447 void mpic_cpu_set_priority(int prio)
1448 {
1449         struct mpic *mpic = mpic_primary;
1450
1451         prio &= MPIC_CPU_TASKPRI_MASK;
1452         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio);
1453 }
1454
1455 void mpic_teardown_this_cpu(int secondary)
1456 {
1457         struct mpic *mpic = mpic_primary;
1458         unsigned long flags;
1459         u32 msk = 1 << hard_smp_processor_id();
1460         unsigned int i;
1461
1462         BUG_ON(mpic == NULL);
1463
1464         DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1465         spin_lock_irqsave(&mpic_lock, flags);
1466
1467         /* let the mpic know we don't want intrs.  */
1468         for (i = 0; i < mpic->num_sources ; i++)
1469                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1470                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk);
1471
1472         /* Set current processor priority to max */
1473         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1474         /* We need to EOI the IPI since not all platforms reset the MPIC
1475          * on boot and new interrupts wouldn't get delivered otherwise.
1476          */
1477         mpic_eoi(mpic);
1478
1479         spin_unlock_irqrestore(&mpic_lock, flags);
1480 }
1481
1482
1483 void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask)
1484 {
1485         struct mpic *mpic = mpic_primary;
1486
1487         BUG_ON(mpic == NULL);
1488
1489 #ifdef DEBUG_IPI
1490         DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no);
1491 #endif
1492
1493         mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) +
1494                        ipi_no * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE),
1495                        mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0]));
1496 }
1497
1498 static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg)
1499 {
1500         u32 src;
1501
1502         src = mpic_cpu_read(reg) & MPIC_INFO(VECPRI_VECTOR_MASK);
1503 #ifdef DEBUG_LOW
1504         DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic->name, reg, src);
1505 #endif
1506         if (unlikely(src == mpic->spurious_vec)) {
1507                 if (mpic->flags & MPIC_SPV_EOI)
1508                         mpic_eoi(mpic);
1509                 return NO_IRQ;
1510         }
1511         if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1512                 if (printk_ratelimit())
1513                         printk(KERN_WARNING "%s: Got protected source %d !\n",
1514                                mpic->name, (int)src);
1515                 mpic_eoi(mpic);
1516                 return NO_IRQ;
1517         }
1518
1519         return irq_linear_revmap(mpic->irqhost, src);
1520 }
1521
1522 unsigned int mpic_get_one_irq(struct mpic *mpic)
1523 {
1524         return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK));
1525 }
1526
1527 unsigned int mpic_get_irq(void)
1528 {
1529         struct mpic *mpic = mpic_primary;
1530
1531         BUG_ON(mpic == NULL);
1532
1533         return mpic_get_one_irq(mpic);
1534 }
1535
1536 unsigned int mpic_get_coreint_irq(void)
1537 {
1538 #ifdef CONFIG_BOOKE
1539         struct mpic *mpic = mpic_primary;
1540         u32 src;
1541
1542         BUG_ON(mpic == NULL);
1543
1544         src = mfspr(SPRN_EPR);
1545
1546         if (unlikely(src == mpic->spurious_vec)) {
1547                 if (mpic->flags & MPIC_SPV_EOI)
1548                         mpic_eoi(mpic);
1549                 return NO_IRQ;
1550         }
1551         if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1552                 if (printk_ratelimit())
1553                         printk(KERN_WARNING "%s: Got protected source %d !\n",
1554                                mpic->name, (int)src);
1555                 return NO_IRQ;
1556         }
1557
1558         return irq_linear_revmap(mpic->irqhost, src);
1559 #else
1560         return NO_IRQ;
1561 #endif
1562 }
1563
1564 unsigned int mpic_get_mcirq(void)
1565 {
1566         struct mpic *mpic = mpic_primary;
1567
1568         BUG_ON(mpic == NULL);
1569
1570         return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_MCACK));
1571 }
1572
1573 #ifdef CONFIG_SMP
1574 void mpic_request_ipis(void)
1575 {
1576         struct mpic *mpic = mpic_primary;
1577         int i;
1578         BUG_ON(mpic == NULL);
1579
1580         printk(KERN_INFO "mpic: requesting IPIs ... \n");
1581
1582         for (i = 0; i < 4; i++) {
1583                 unsigned int vipi = irq_create_mapping(mpic->irqhost,
1584                                                        mpic->ipi_vecs[0] + i);
1585                 if (vipi == NO_IRQ) {
1586                         printk(KERN_ERR "Failed to map %s\n", smp_ipi_name[i]);
1587                         continue;
1588                 }
1589                 smp_request_message_ipi(vipi, i);
1590         }
1591 }
1592
1593 void smp_mpic_message_pass(int target, int msg)
1594 {
1595         /* make sure we're sending something that translates to an IPI */
1596         if ((unsigned int)msg > 3) {
1597                 printk("SMP %d: smp_message_pass: unknown msg %d\n",
1598                        smp_processor_id(), msg);
1599                 return;
1600         }
1601         switch (target) {
1602         case MSG_ALL:
1603                 mpic_send_ipi(msg, 0xffffffff);
1604                 break;
1605         case MSG_ALL_BUT_SELF:
1606                 mpic_send_ipi(msg, 0xffffffff & ~(1 << smp_processor_id()));
1607                 break;
1608         default:
1609                 mpic_send_ipi(msg, 1 << target);
1610                 break;
1611         }
1612 }
1613
1614 int __init smp_mpic_probe(void)
1615 {
1616         int nr_cpus;
1617
1618         DBG("smp_mpic_probe()...\n");
1619
1620         nr_cpus = cpus_weight(cpu_possible_map);
1621
1622         DBG("nr_cpus: %d\n", nr_cpus);
1623
1624         if (nr_cpus > 1)
1625                 mpic_request_ipis();
1626
1627         return nr_cpus;
1628 }
1629
1630 void __devinit smp_mpic_setup_cpu(int cpu)
1631 {
1632         mpic_setup_this_cpu();
1633 }
1634 #endif /* CONFIG_SMP */
1635
1636 #ifdef CONFIG_PM
1637 static int mpic_suspend(struct sys_device *dev, pm_message_t state)
1638 {
1639         struct mpic *mpic = container_of(dev, struct mpic, sysdev);
1640         int i;
1641
1642         for (i = 0; i < mpic->num_sources; i++) {
1643                 mpic->save_data[i].vecprio =
1644                         mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI));
1645                 mpic->save_data[i].dest =
1646                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION));
1647         }
1648
1649         return 0;
1650 }
1651
1652 static int mpic_resume(struct sys_device *dev)
1653 {
1654         struct mpic *mpic = container_of(dev, struct mpic, sysdev);
1655         int i;
1656
1657         for (i = 0; i < mpic->num_sources; i++) {
1658                 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI),
1659                                mpic->save_data[i].vecprio);
1660                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1661                                mpic->save_data[i].dest);
1662
1663 #ifdef CONFIG_MPIC_U3_HT_IRQS
1664         {
1665                 struct mpic_irq_fixup *fixup = &mpic->fixups[i];
1666
1667                 if (fixup->base) {
1668                         /* we use the lowest bit in an inverted meaning */
1669                         if ((mpic->save_data[i].fixup_data & 1) == 0)
1670                                 continue;
1671
1672                         /* Enable and configure */
1673                         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
1674
1675                         writel(mpic->save_data[i].fixup_data & ~1,
1676                                fixup->base + 4);
1677                 }
1678         }
1679 #endif
1680         } /* end for loop */
1681
1682         return 0;
1683 }
1684 #endif
1685
1686 static struct sysdev_class mpic_sysclass = {
1687 #ifdef CONFIG_PM
1688         .resume = mpic_resume,
1689         .suspend = mpic_suspend,
1690 #endif
1691         .name = "mpic",
1692 };
1693
1694 static int mpic_init_sys(void)
1695 {
1696         struct mpic *mpic = mpics;
1697         int error, id = 0;
1698
1699         error = sysdev_class_register(&mpic_sysclass);
1700
1701         while (mpic && !error) {
1702                 mpic->sysdev.cls = &mpic_sysclass;
1703                 mpic->sysdev.id = id++;
1704                 error = sysdev_register(&mpic->sysdev);
1705                 mpic = mpic->next;
1706         }
1707         return error;
1708 }
1709
1710 device_initcall(mpic_init_sys);