git.oblomov.eu Git - linux-2.6/blob - 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%lx\n",
 439                 PCI_SLOT(devfn), PCI_FUNC(devfn),
 440                 flags & HT_MSI_FLAGS_ENABLE ? "enabled" : "disabled", addr);
 441
 442         if (!(flags & HT_MSI_FLAGS_ENABLE))
 443                 writeb(flags | HT_MSI_FLAGS_ENABLE, base + HT_MSI_FLAGS);
 444 }
 445 #else
 446 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
 447                                     unsigned int devfn)
 448 {
 449         return;
 450 }
 451 #endif
 452
 453 static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
 454                                     unsigned int devfn, u32 vdid)
 455 {
 456         int i, irq, n;
 457         u8 __iomem *base;
 458         u32 tmp;
 459         u8 pos;
 460
 461         for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
 462              pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
 463                 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
 464                 if (id == PCI_CAP_ID_HT) {
 465                         id = readb(devbase + pos + 3);
 466                         if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_IRQ)
 467                                 break;
 468                 }
 469         }
 470         if (pos == 0)
 471                 return;
 472
 473         base = devbase + pos;
 474         writeb(0x01, base + 2);
 475         n = (readl(base + 4) >> 16) & 0xff;
 476
 477         printk(KERN_INFO "mpic:   - HT:%02x.%x [0x%02x] vendor %04x device %04x"
 478                " has %d irqs\n",
 479                devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1);
 480
 481         for (i = 0; i <= n; i++) {
 482                 writeb(0x10 + 2 * i, base + 2);
 483                 tmp = readl(base + 4);
 484                 irq = (tmp >> 16) & 0xff;
 485                 DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp);
 486                 /* mask it , will be unmasked later */
 487                 tmp |= 0x1;
 488                 writel(tmp, base + 4);
 489                 mpic->fixups[irq].index = i;
 490                 mpic->fixups[irq].base = base;
 491                 /* Apple HT PIC has a non-standard way of doing EOIs */
 492                 if ((vdid & 0xffff) == 0x106b)
 493                         mpic->fixups[irq].applebase = devbase + 0x60;
 494                 else
 495                         mpic->fixups[irq].applebase = NULL;
 496                 writeb(0x11 + 2 * i, base + 2);
 497                 mpic->fixups[irq].data = readl(base + 4) | 0x80000000;
 498         }
 499 }
 500
 501
 502 static void __init mpic_scan_ht_pics(struct mpic *mpic)
 503 {
 504         unsigned int devfn;
 505         u8 __iomem *cfgspace;
 506
 507         printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n");
 508
 509         /* Allocate fixups array */
 510         mpic->fixups = alloc_bootmem(128 * sizeof(struct mpic_irq_fixup));
 511         BUG_ON(mpic->fixups == NULL);
 512         memset(mpic->fixups, 0, 128 * sizeof(struct mpic_irq_fixup));
 513
 514         /* Init spinlock */
 515         spin_lock_init(&mpic->fixup_lock);
 516
 517         /* Map U3 config space. We assume all IO-APICs are on the primary bus
 518          * so we only need to map 64kB.
 519          */
 520         cfgspace = ioremap(0xf2000000, 0x10000);
 521         BUG_ON(cfgspace == NULL);
 522
 523         /* Now we scan all slots. We do a very quick scan, we read the header
 524          * type, vendor ID and device ID only, that's plenty enough
 525          */
 526         for (devfn = 0; devfn < 0x100; devfn++) {
 527                 u8 __iomem *devbase = cfgspace + (devfn << 8);
 528                 u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
 529                 u32 l = readl(devbase + PCI_VENDOR_ID);
 530                 u16 s;
 531
 532                 DBG("devfn %x, l: %x\n", devfn, l);
 533
 534                 /* If no device, skip */
 535                 if (l == 0xffffffff || l == 0x00000000 ||
 536                     l == 0x0000ffff || l == 0xffff0000)
 537                         goto next;
 538                 /* Check if is supports capability lists */
 539                 s = readw(devbase + PCI_STATUS);
 540                 if (!(s & PCI_STATUS_CAP_LIST))
 541                         goto next;
 542
 543                 mpic_scan_ht_pic(mpic, devbase, devfn, l);
 544                 mpic_scan_ht_msi(mpic, devbase, devfn);
 545
 546         next:
 547                 /* next device, if function 0 */
 548                 if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0)
 549                         devfn += 7;
 550         }
 551 }
 552
 553 #else /* CONFIG_MPIC_U3_HT_IRQS */
 554
 555 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
 556 {
 557         return 0;
 558 }
 559
 560 static void __init mpic_scan_ht_pics(struct mpic *mpic)
 561 {
 562 }
 563
 564 #endif /* CONFIG_MPIC_U3_HT_IRQS */
 565
 566
 567 #define mpic_irq_to_hw(virq)    ((unsigned int)irq_map[virq].hwirq)
 568
 569 /* Find an mpic associated with a given linux interrupt */
 570 static struct mpic *mpic_find(unsigned int irq, unsigned int *is_ipi)
 571 {
 572         unsigned int src = mpic_irq_to_hw(irq);
 573         struct mpic *mpic;
 574
 575         if (irq < NUM_ISA_INTERRUPTS)
 576                 return NULL;
 577
 578         mpic = irq_desc[irq].chip_data;
 579
 580         if (is_ipi)
 581                 *is_ipi = (src >= mpic->ipi_vecs[0] &&
 582                            src <= mpic->ipi_vecs[3]);
 583
 584         return mpic;
 585 }
 586
 587 /* Convert a cpu mask from logical to physical cpu numbers. */
 588 static inline u32 mpic_physmask(u32 cpumask)
 589 {
 590         int i;
 591         u32 mask = 0;
 592
 593         for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1)
 594                 mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
 595         return mask;
 596 }
 597
 598 #ifdef CONFIG_SMP
 599 /* Get the mpic structure from the IPI number */
 600 static inline struct mpic * mpic_from_ipi(unsigned int ipi)
 601 {
 602         return irq_desc[ipi].chip_data;
 603 }
 604 #endif
 605
 606 /* Get the mpic structure from the irq number */
 607 static inline struct mpic * mpic_from_irq(unsigned int irq)
 608 {
 609         return irq_desc[irq].chip_data;
 610 }
 611
 612 /* Send an EOI */
 613 static inline void mpic_eoi(struct mpic *mpic)
 614 {
 615         mpic_cpu_write(MPIC_INFO(CPU_EOI), 0);
 616         (void)mpic_cpu_read(MPIC_INFO(CPU_WHOAMI));
 617 }
 618
 619 #ifdef CONFIG_SMP
 620 static irqreturn_t mpic_ipi_action(int irq, void *data)
 621 {
 622         long ipi = (long)data;
 623
 624         smp_message_recv(ipi);
 625
 626         return IRQ_HANDLED;
 627 }
 628 #endif /* CONFIG_SMP */
 629
 630 /*
 631  * Linux descriptor level callbacks
 632  */
 633
 634
 635 void mpic_unmask_irq(unsigned int irq)
 636 {
 637         unsigned int loops = 100000;
 638         struct mpic *mpic = mpic_from_irq(irq);
 639         unsigned int src = mpic_irq_to_hw(irq);
 640
 641         DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, irq, src);
 642
 643         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
 644                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) &
 645                        ~MPIC_VECPRI_MASK);
 646         /* make sure mask gets to controller before we return to user */
 647         do {
 648                 if (!loops--) {
 649                         printk(KERN_ERR "mpic_enable_irq timeout\n");
 650                         break;
 651                 }
 652         } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK);
 653 }
 654
 655 void mpic_mask_irq(unsigned int irq)
 656 {
 657         unsigned int loops = 100000;
 658         struct mpic *mpic = mpic_from_irq(irq);
 659         unsigned int src = mpic_irq_to_hw(irq);
 660
 661         DBG("%s: disable_irq: %d (src %d)\n", mpic->name, irq, src);
 662
 663         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
 664                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) |
 665                        MPIC_VECPRI_MASK);
 666
 667         /* make sure mask gets to controller before we return to user */
 668         do {
 669                 if (!loops--) {
 670                         printk(KERN_ERR "mpic_enable_irq timeout\n");
 671                         break;
 672                 }
 673         } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK));
 674 }
 675
 676 void mpic_end_irq(unsigned int irq)
 677 {
 678         struct mpic *mpic = mpic_from_irq(irq);
 679
 680 #ifdef DEBUG_IRQ
 681         DBG("%s: end_irq: %d\n", mpic->name, irq);
 682 #endif
 683         /* We always EOI on end_irq() even for edge interrupts since that
 684          * should only lower the priority, the MPIC should have properly
 685          * latched another edge interrupt coming in anyway
 686          */
 687
 688         mpic_eoi(mpic);
 689 }
 690
 691 #ifdef CONFIG_MPIC_U3_HT_IRQS
 692
 693 static void mpic_unmask_ht_irq(unsigned int irq)
 694 {
 695         struct mpic *mpic = mpic_from_irq(irq);
 696         unsigned int src = mpic_irq_to_hw(irq);
 697
 698         mpic_unmask_irq(irq);
 699
 700         if (irq_desc[irq].status & IRQ_LEVEL)
 701                 mpic_ht_end_irq(mpic, src);
 702 }
 703
 704 static unsigned int mpic_startup_ht_irq(unsigned int irq)
 705 {
 706         struct mpic *mpic = mpic_from_irq(irq);
 707         unsigned int src = mpic_irq_to_hw(irq);
 708
 709         mpic_unmask_irq(irq);
 710         mpic_startup_ht_interrupt(mpic, src, irq_desc[irq].status);
 711
 712         return 0;
 713 }
 714
 715 static void mpic_shutdown_ht_irq(unsigned int irq)
 716 {
 717         struct mpic *mpic = mpic_from_irq(irq);
 718         unsigned int src = mpic_irq_to_hw(irq);
 719
 720         mpic_shutdown_ht_interrupt(mpic, src, irq_desc[irq].status);
 721         mpic_mask_irq(irq);
 722 }
 723
 724 static void mpic_end_ht_irq(unsigned int irq)
 725 {
 726         struct mpic *mpic = mpic_from_irq(irq);
 727         unsigned int src = mpic_irq_to_hw(irq);
 728
 729 #ifdef DEBUG_IRQ
 730         DBG("%s: end_irq: %d\n", mpic->name, irq);
 731 #endif
 732         /* We always EOI on end_irq() even for edge interrupts since that
 733          * should only lower the priority, the MPIC should have properly
 734          * latched another edge interrupt coming in anyway
 735          */
 736
 737         if (irq_desc[irq].status & IRQ_LEVEL)
 738                 mpic_ht_end_irq(mpic, src);
 739         mpic_eoi(mpic);
 740 }
 741 #endif /* !CONFIG_MPIC_U3_HT_IRQS */
 742
 743 #ifdef CONFIG_SMP
 744
 745 static void mpic_unmask_ipi(unsigned int irq)
 746 {
 747         struct mpic *mpic = mpic_from_ipi(irq);
 748         unsigned int src = mpic_irq_to_hw(irq) - mpic->ipi_vecs[0];
 749
 750         DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, irq, src);
 751         mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
 752 }
 753
 754 static void mpic_mask_ipi(unsigned int irq)
 755 {
 756         /* NEVER disable an IPI... that's just plain wrong! */
 757 }
 758
 759 static void mpic_end_ipi(unsigned int irq)
 760 {
 761         struct mpic *mpic = mpic_from_ipi(irq);
 762
 763         /*
 764          * IPIs are marked IRQ_PER_CPU. This has the side effect of
 765          * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
 766          * applying to them. We EOI them late to avoid re-entering.
 767          * We mark IPI's with IRQF_DISABLED as they must run with
 768          * irqs disabled.
 769          */
 770         mpic_eoi(mpic);
 771 }
 772
 773 #endif /* CONFIG_SMP */
 774
 775 void mpic_set_affinity(unsigned int irq, cpumask_t cpumask)
 776 {
 777         struct mpic *mpic = mpic_from_irq(irq);
 778         unsigned int src = mpic_irq_to_hw(irq);
 779
 780         cpumask_t tmp;
 781
 782         cpus_and(tmp, cpumask, cpu_online_map);
 783
 784         mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION),
 785                        mpic_physmask(cpus_addr(tmp)[0]));
 786 }
 787
 788 static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type)
 789 {
 790         /* Now convert sense value */
 791         switch(type & IRQ_TYPE_SENSE_MASK) {
 792         case IRQ_TYPE_EDGE_RISING:
 793                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
 794                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
 795         case IRQ_TYPE_EDGE_FALLING:
 796         case IRQ_TYPE_EDGE_BOTH:
 797                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
 798                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
 799         case IRQ_TYPE_LEVEL_HIGH:
 800                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
 801                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
 802         case IRQ_TYPE_LEVEL_LOW:
 803         default:
 804                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
 805                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
 806         }
 807 }
 808
 809 int mpic_set_irq_type(unsigned int virq, unsigned int flow_type)
 810 {
 811         struct mpic *mpic = mpic_from_irq(virq);
 812         unsigned int src = mpic_irq_to_hw(virq);
 813         struct irq_desc *desc = get_irq_desc(virq);
 814         unsigned int vecpri, vold, vnew;
 815
 816         DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n",
 817             mpic, virq, src, flow_type);
 818
 819         if (src >= mpic->irq_count)
 820                 return -EINVAL;
 821
 822         if (flow_type == IRQ_TYPE_NONE)
 823                 if (mpic->senses && src < mpic->senses_count)
 824                         flow_type = mpic->senses[src];
 825         if (flow_type == IRQ_TYPE_NONE)
 826                 flow_type = IRQ_TYPE_LEVEL_LOW;
 827
 828         desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
 829         desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
 830         if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
 831                 desc->status |= IRQ_LEVEL;
 832
 833         if (mpic_is_ht_interrupt(mpic, src))
 834                 vecpri = MPIC_VECPRI_POLARITY_POSITIVE |
 835                         MPIC_VECPRI_SENSE_EDGE;
 836         else
 837                 vecpri = mpic_type_to_vecpri(mpic, flow_type);
 838
 839         vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
 840         vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) |
 841                         MPIC_INFO(VECPRI_SENSE_MASK));
 842         vnew |= vecpri;
 843         if (vold != vnew)
 844                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew);
 845
 846         return 0;
 847 }
 848
 849 void mpic_set_vector(unsigned int virq, unsigned int vector)
 850 {
 851         struct mpic *mpic = mpic_from_irq(virq);
 852         unsigned int src = mpic_irq_to_hw(virq);
 853         unsigned int vecpri;
 854
 855         DBG("mpic: set_vector(mpic:@%p,virq:%d,src:%d,vector:0x%x)\n",
 856             mpic, virq, src, vector);
 857
 858         if (src >= mpic->irq_count)
 859                 return;
 860
 861         vecpri = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
 862         vecpri = vecpri & ~MPIC_INFO(VECPRI_VECTOR_MASK);
 863         vecpri |= vector;
 864         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
 865 }
 866
 867 static struct irq_chip mpic_irq_chip = {
 868         .mask           = mpic_mask_irq,
 869         .unmask         = mpic_unmask_irq,
 870         .eoi            = mpic_end_irq,
 871         .set_type       = mpic_set_irq_type,
 872 };
 873
 874 #ifdef CONFIG_SMP
 875 static struct irq_chip mpic_ipi_chip = {
 876         .mask           = mpic_mask_ipi,
 877         .unmask         = mpic_unmask_ipi,
 878         .eoi            = mpic_end_ipi,
 879 };
 880 #endif /* CONFIG_SMP */
 881
 882 #ifdef CONFIG_MPIC_U3_HT_IRQS
 883 static struct irq_chip mpic_irq_ht_chip = {
 884         .startup        = mpic_startup_ht_irq,
 885         .shutdown       = mpic_shutdown_ht_irq,
 886         .mask           = mpic_mask_irq,
 887         .unmask         = mpic_unmask_ht_irq,
 888         .eoi            = mpic_end_ht_irq,
 889         .set_type       = mpic_set_irq_type,
 890 };
 891 #endif /* CONFIG_MPIC_U3_HT_IRQS */
 892
 893
 894 static int mpic_host_match(struct irq_host *h, struct device_node *node)
 895 {
 896         /* Exact match, unless mpic node is NULL */
 897         return h->of_node == NULL || h->of_node == node;
 898 }
 899
 900 static int mpic_host_map(struct irq_host *h, unsigned int virq,
 901                          irq_hw_number_t hw)
 902 {
 903         struct mpic *mpic = h->host_data;
 904         struct irq_chip *chip;
 905
 906         DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw);
 907
 908         if (hw == mpic->spurious_vec)
 909                 return -EINVAL;
 910         if (mpic->protected && test_bit(hw, mpic->protected))
 911                 return -EINVAL;
 912
 913 #ifdef CONFIG_SMP
 914         else if (hw >= mpic->ipi_vecs[0]) {
 915                 WARN_ON(!(mpic->flags & MPIC_PRIMARY));
 916
 917                 DBG("mpic: mapping as IPI\n");
 918                 set_irq_chip_data(virq, mpic);
 919                 set_irq_chip_and_handler(virq, &mpic->hc_ipi,
 920                                          handle_percpu_irq);
 921                 return 0;
 922         }
 923 #endif /* CONFIG_SMP */
 924
 925         if (hw >= mpic->irq_count)
 926                 return -EINVAL;
 927
 928         mpic_msi_reserve_hwirq(mpic, hw);
 929
 930         /* Default chip */
 931         chip = &mpic->hc_irq;
 932
 933 #ifdef CONFIG_MPIC_U3_HT_IRQS
 934         /* Check for HT interrupts, override vecpri */
 935         if (mpic_is_ht_interrupt(mpic, hw))
 936                 chip = &mpic->hc_ht_irq;
 937 #endif /* CONFIG_MPIC_U3_HT_IRQS */
 938
 939         DBG("mpic: mapping to irq chip @%p\n", chip);
 940
 941         set_irq_chip_data(virq, mpic);
 942         set_irq_chip_and_handler(virq, chip, handle_fasteoi_irq);
 943
 944         /* Set default irq type */
 945         set_irq_type(virq, IRQ_TYPE_NONE);
 946
 947         return 0;
 948 }
 949
 950 static int mpic_host_xlate(struct irq_host *h, struct device_node *ct,
 951                            u32 *intspec, unsigned int intsize,
 952                            irq_hw_number_t *out_hwirq, unsigned int *out_flags)
 953
 954 {
 955         static unsigned char map_mpic_senses[4] = {
 956                 IRQ_TYPE_EDGE_RISING,
 957                 IRQ_TYPE_LEVEL_LOW,
 958                 IRQ_TYPE_LEVEL_HIGH,
 959                 IRQ_TYPE_EDGE_FALLING,
 960         };
 961
 962         *out_hwirq = intspec[0];
 963         if (intsize > 1) {
 964                 u32 mask = 0x3;
 965
 966                 /* Apple invented a new race of encoding on machines with
 967                  * an HT APIC. They encode, among others, the index within
 968                  * the HT APIC. We don't care about it here since thankfully,
 969                  * it appears that they have the APIC already properly
 970                  * configured, and thus our current fixup code that reads the
 971                  * APIC config works fine. However, we still need to mask out
 972                  * bits in the specifier to make sure we only get bit 0 which
 973                  * is the level/edge bit (the only sense bit exposed by Apple),
 974                  * as their bit 1 means something else.
 975                  */
 976                 if (machine_is(powermac))
 977                         mask = 0x1;
 978                 *out_flags = map_mpic_senses[intspec[1] & mask];
 979         } else
 980                 *out_flags = IRQ_TYPE_NONE;
 981
 982         DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
 983             intsize, intspec[0], intspec[1], *out_hwirq, *out_flags);
 984
 985         return 0;
 986 }
 987
 988 static struct irq_host_ops mpic_host_ops = {
 989         .match = mpic_host_match,
 990         .map = mpic_host_map,
 991         .xlate = mpic_host_xlate,
 992 };
 993
 994 /*
 995  * Exported functions
 996  */
 997
 998 struct mpic * __init mpic_alloc(struct device_node *node,
 999                                 phys_addr_t phys_addr,
1000                                 unsigned int flags,
1001                                 unsigned int isu_size,
1002                                 unsigned int irq_count,
1003                                 const char *name)
1004 {
1005         struct mpic     *mpic;
1006         u32             greg_feature;
1007         const char      *vers;
1008         int             i;
1009         int             intvec_top;
1010         u64             paddr = phys_addr;
1011
1012         mpic = alloc_bootmem(sizeof(struct mpic));
1013         if (mpic == NULL)
1014                 return NULL;
1015
1016         memset(mpic, 0, sizeof(struct mpic));
1017         mpic->name = name;
1018
1019         mpic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
1020                                        isu_size, &mpic_host_ops,
1021                                        flags & MPIC_LARGE_VECTORS ? 2048 : 256);
1022         if (mpic->irqhost == NULL)
1023                 return NULL;
1024
1025         mpic->irqhost->host_data = mpic;
1026         mpic->hc_irq = mpic_irq_chip;
1027         mpic->hc_irq.typename = name;
1028         if (flags & MPIC_PRIMARY)
1029                 mpic->hc_irq.set_affinity = mpic_set_affinity;
1030 #ifdef CONFIG_MPIC_U3_HT_IRQS
1031         mpic->hc_ht_irq = mpic_irq_ht_chip;
1032         mpic->hc_ht_irq.typename = name;
1033         if (flags & MPIC_PRIMARY)
1034                 mpic->hc_ht_irq.set_affinity = mpic_set_affinity;
1035 #endif /* CONFIG_MPIC_U3_HT_IRQS */
1036
1037 #ifdef CONFIG_SMP
1038         mpic->hc_ipi = mpic_ipi_chip;
1039         mpic->hc_ipi.typename = name;
1040 #endif /* CONFIG_SMP */
1041
1042         mpic->flags = flags;
1043         mpic->isu_size = isu_size;
1044         mpic->irq_count = irq_count;
1045         mpic->num_sources = 0; /* so far */
1046
1047         if (flags & MPIC_LARGE_VECTORS)
1048                 intvec_top = 2047;
1049         else
1050                 intvec_top = 255;
1051
1052         mpic->timer_vecs[0] = intvec_top - 8;
1053         mpic->timer_vecs[1] = intvec_top - 7;
1054         mpic->timer_vecs[2] = intvec_top - 6;
1055         mpic->timer_vecs[3] = intvec_top - 5;
1056         mpic->ipi_vecs[0]   = intvec_top - 4;
1057         mpic->ipi_vecs[1]   = intvec_top - 3;
1058         mpic->ipi_vecs[2]   = intvec_top - 2;
1059         mpic->ipi_vecs[3]   = intvec_top - 1;
1060         mpic->spurious_vec  = intvec_top;
1061
1062         /* Check for "big-endian" in device-tree */
1063         if (node && of_get_property(node, "big-endian", NULL) != NULL)
1064                 mpic->flags |= MPIC_BIG_ENDIAN;
1065
1066         /* Look for protected sources */
1067         if (node) {
1068                 int psize;
1069                 unsigned int bits, mapsize;
1070                 const u32 *psrc =
1071                         of_get_property(node, "protected-sources", &psize);
1072                 if (psrc) {
1073                         psize /= 4;
1074                         bits = intvec_top + 1;
1075                         mapsize = BITS_TO_LONGS(bits) * sizeof(unsigned long);
1076                         mpic->protected = alloc_bootmem(mapsize);
1077                         BUG_ON(mpic->protected == NULL);
1078                         memset(mpic->protected, 0, mapsize);
1079                         for (i = 0; i < psize; i++) {
1080                                 if (psrc[i] > intvec_top)
1081                                         continue;
1082                                 __set_bit(psrc[i], mpic->protected);
1083                         }
1084                 }
1085         }
1086
1087 #ifdef CONFIG_MPIC_WEIRD
1088         mpic->hw_set = mpic_infos[MPIC_GET_REGSET(flags)];
1089 #endif
1090
1091         /* default register type */
1092         mpic->reg_type = (flags & MPIC_BIG_ENDIAN) ?
1093                 mpic_access_mmio_be : mpic_access_mmio_le;
1094
1095         /* If no physical address is passed in, a device-node is mandatory */
1096         BUG_ON(paddr == 0 && node == NULL);
1097
1098         /* If no physical address passed in, check if it's dcr based */
1099         if (paddr == 0 && of_get_property(node, "dcr-reg", NULL) != NULL) {
1100 #ifdef CONFIG_PPC_DCR
1101                 mpic->flags |= MPIC_USES_DCR;
1102                 mpic->reg_type = mpic_access_dcr;
1103 #else
1104                 BUG();
1105 #endif /* CONFIG_PPC_DCR */
1106         }
1107
1108         /* If the MPIC is not DCR based, and no physical address was passed
1109          * in, try to obtain one
1110          */
1111         if (paddr == 0 && !(mpic->flags & MPIC_USES_DCR)) {
1112                 const u32 *reg = of_get_property(node, "reg", NULL);
1113                 BUG_ON(reg == NULL);
1114                 paddr = of_translate_address(node, reg);
1115                 BUG_ON(paddr == OF_BAD_ADDR);
1116         }
1117
1118         /* Map the global registers */
1119         mpic_map(mpic, paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
1120         mpic_map(mpic, paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
1121
1122         /* Reset */
1123         if (flags & MPIC_WANTS_RESET) {
1124                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1125                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1126                            | MPIC_GREG_GCONF_RESET);
1127                 while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1128                        & MPIC_GREG_GCONF_RESET)
1129                         mb();
1130         }
1131
1132         if (flags & MPIC_ENABLE_MCK)
1133                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1134                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1135                            | MPIC_GREG_GCONF_MCK);
1136
1137         /* Read feature register, calculate num CPUs and, for non-ISU
1138          * MPICs, num sources as well. On ISU MPICs, sources are counted
1139          * as ISUs are added
1140          */
1141         greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
1142         mpic->num_cpus = ((greg_feature & MPIC_GREG_FEATURE_LAST_CPU_MASK)
1143                           >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
1144         if (isu_size == 0) {
1145                 if (flags & MPIC_BROKEN_FRR_NIRQS)
1146                         mpic->num_sources = mpic->irq_count;
1147                 else
1148                         mpic->num_sources =
1149                                 ((greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
1150                                  >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
1151         }
1152
1153         /* Map the per-CPU registers */
1154         for (i = 0; i < mpic->num_cpus; i++) {
1155                 mpic_map(mpic, paddr, &mpic->cpuregs[i],
1156                          MPIC_INFO(CPU_BASE) + i * MPIC_INFO(CPU_STRIDE),
1157                          0x1000);
1158         }
1159
1160         /* Initialize main ISU if none provided */
1161         if (mpic->isu_size == 0) {
1162                 mpic->isu_size = mpic->num_sources;
1163                 mpic_map(mpic, paddr, &mpic->isus[0],
1164                          MPIC_INFO(IRQ_BASE), MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1165         }
1166         mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
1167         mpic->isu_mask = (1 << mpic->isu_shift) - 1;
1168
1169         /* Display version */
1170         switch (greg_feature & MPIC_GREG_FEATURE_VERSION_MASK) {
1171         case 1:
1172                 vers = "1.0";
1173                 break;
1174         case 2:
1175                 vers = "1.2";
1176                 break;
1177         case 3:
1178                 vers = "1.3";
1179                 break;
1180         default:
1181                 vers = "<unknown>";
1182                 break;
1183         }
1184         printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx,"
1185                " max %d CPUs\n",
1186                name, vers, (unsigned long long)paddr, mpic->num_cpus);
1187         printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n",
1188                mpic->isu_size, mpic->isu_shift, mpic->isu_mask);
1189
1190         mpic->next = mpics;
1191         mpics = mpic;
1192
1193         if (flags & MPIC_PRIMARY) {
1194                 mpic_primary = mpic;
1195                 irq_set_default_host(mpic->irqhost);
1196         }
1197
1198         return mpic;
1199 }
1200
1201 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
1202                             phys_addr_t paddr)
1203 {
1204         unsigned int isu_first = isu_num * mpic->isu_size;
1205
1206         BUG_ON(isu_num >= MPIC_MAX_ISU);
1207
1208         mpic_map(mpic, paddr, &mpic->isus[isu_num], 0,
1209                  MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1210         if ((isu_first + mpic->isu_size) > mpic->num_sources)
1211                 mpic->num_sources = isu_first + mpic->isu_size;
1212 }
1213
1214 void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count)
1215 {
1216         mpic->senses = senses;
1217         mpic->senses_count = count;
1218 }
1219
1220 void __init mpic_init(struct mpic *mpic)
1221 {
1222         int i;
1223
1224         BUG_ON(mpic->num_sources == 0);
1225
1226         printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
1227
1228         /* Set current processor priority to max */
1229         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1230
1231         /* Initialize timers: just disable them all */
1232         for (i = 0; i < 4; i++) {
1233                 mpic_write(mpic->tmregs,
1234                            i * MPIC_INFO(TIMER_STRIDE) +
1235                            MPIC_INFO(TIMER_DESTINATION), 0);
1236                 mpic_write(mpic->tmregs,
1237                            i * MPIC_INFO(TIMER_STRIDE) +
1238                            MPIC_INFO(TIMER_VECTOR_PRI),
1239                            MPIC_VECPRI_MASK |
1240                            (mpic->timer_vecs[0] + i));
1241         }
1242
1243         /* Initialize IPIs to our reserved vectors and mark them disabled for now */
1244         mpic_test_broken_ipi(mpic);
1245         for (i = 0; i < 4; i++) {
1246                 mpic_ipi_write(i,
1247                                MPIC_VECPRI_MASK |
1248                                (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
1249                                (mpic->ipi_vecs[0] + i));
1250         }
1251
1252         /* Initialize interrupt sources */
1253         if (mpic->irq_count == 0)
1254                 mpic->irq_count = mpic->num_sources;
1255
1256         /* Do the HT PIC fixups on U3 broken mpic */
1257         DBG("MPIC flags: %x\n", mpic->flags);
1258         if ((mpic->flags & MPIC_U3_HT_IRQS) && (mpic->flags & MPIC_PRIMARY)) {
1259                 mpic_scan_ht_pics(mpic);
1260                 mpic_u3msi_init(mpic);
1261         }
1262
1263         mpic_pasemi_msi_init(mpic);
1264
1265         for (i = 0; i < mpic->num_sources; i++) {
1266                 /* start with vector = source number, and masked */
1267                 u32 vecpri = MPIC_VECPRI_MASK | i |
1268                         (8 << MPIC_VECPRI_PRIORITY_SHIFT);
1269
1270                 /* check if protected */
1271                 if (mpic->protected && test_bit(i, mpic->protected))
1272                         continue;
1273                 /* init hw */
1274                 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
1275                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1276                                1 << hard_smp_processor_id());
1277         }
1278
1279         /* Init spurious vector */
1280         mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), mpic->spurious_vec);
1281
1282         /* Disable 8259 passthrough, if supported */
1283         if (!(mpic->flags & MPIC_NO_PTHROU_DIS))
1284                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1285                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1286                            | MPIC_GREG_GCONF_8259_PTHROU_DIS);
1287
1288         if (mpic->flags & MPIC_NO_BIAS)
1289                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1290                         mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1291                         | MPIC_GREG_GCONF_NO_BIAS);
1292
1293         /* Set current processor priority to 0 */
1294         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1295
1296 #ifdef CONFIG_PM
1297         /* allocate memory to save mpic state */
1298         mpic->save_data = alloc_bootmem(mpic->num_sources * sizeof(struct mpic_irq_save));
1299         BUG_ON(mpic->save_data == NULL);
1300 #endif
1301 }
1302
1303 void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)
1304 {
1305         u32 v;
1306
1307         v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1308         v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK;
1309         v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio);
1310         mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1311 }
1312
1313 void __init mpic_set_serial_int(struct mpic *mpic, int enable)
1314 {
1315         unsigned long flags;
1316         u32 v;
1317
1318         spin_lock_irqsave(&mpic_lock, flags);
1319         v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1320         if (enable)
1321                 v |= MPIC_GREG_GLOBAL_CONF_1_SIE;
1322         else
1323                 v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE;
1324         mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1325         spin_unlock_irqrestore(&mpic_lock, flags);
1326 }
1327
1328 void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
1329 {
1330         unsigned int is_ipi;
1331         struct mpic *mpic = mpic_find(irq, &is_ipi);
1332         unsigned int src = mpic_irq_to_hw(irq);
1333         unsigned long flags;
1334         u32 reg;
1335
1336         if (!mpic)
1337                 return;
1338
1339         spin_lock_irqsave(&mpic_lock, flags);
1340         if (is_ipi) {
1341                 reg = mpic_ipi_read(src - mpic->ipi_vecs[0]) &
1342                         ~MPIC_VECPRI_PRIORITY_MASK;
1343                 mpic_ipi_write(src - mpic->ipi_vecs[0],
1344                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1345         } else {
1346                 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI))
1347                         & ~MPIC_VECPRI_PRIORITY_MASK;
1348                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
1349                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1350         }
1351         spin_unlock_irqrestore(&mpic_lock, flags);
1352 }
1353
1354 void mpic_setup_this_cpu(void)
1355 {
1356 #ifdef CONFIG_SMP
1357         struct mpic *mpic = mpic_primary;
1358         unsigned long flags;
1359         u32 msk = 1 << hard_smp_processor_id();
1360         unsigned int i;
1361
1362         BUG_ON(mpic == NULL);
1363
1364         DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1365
1366         spin_lock_irqsave(&mpic_lock, flags);
1367
1368         /* let the mpic know we want intrs. default affinity is 0xffffffff
1369          * until changed via /proc. That's how it's done on x86. If we want
1370          * it differently, then we should make sure we also change the default
1371          * values of irq_desc[].affinity in irq.c.
1372          */
1373         if (distribute_irqs) {
1374                 for (i = 0; i < mpic->num_sources ; i++)
1375                         mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1376                                 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk);
1377         }
1378
1379         /* Set current processor priority to 0 */
1380         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1381
1382         spin_unlock_irqrestore(&mpic_lock, flags);
1383 #endif /* CONFIG_SMP */
1384 }
1385
1386 int mpic_cpu_get_priority(void)
1387 {
1388         struct mpic *mpic = mpic_primary;
1389
1390         return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI));
1391 }
1392
1393 void mpic_cpu_set_priority(int prio)
1394 {
1395         struct mpic *mpic = mpic_primary;
1396
1397         prio &= MPIC_CPU_TASKPRI_MASK;
1398         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio);
1399 }
1400
1401 void mpic_teardown_this_cpu(int secondary)
1402 {
1403         struct mpic *mpic = mpic_primary;
1404         unsigned long flags;
1405         u32 msk = 1 << hard_smp_processor_id();
1406         unsigned int i;
1407
1408         BUG_ON(mpic == NULL);
1409
1410         DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1411         spin_lock_irqsave(&mpic_lock, flags);
1412
1413         /* let the mpic know we don't want intrs.  */
1414         for (i = 0; i < mpic->num_sources ; i++)
1415                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1416                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk);
1417
1418         /* Set current processor priority to max */
1419         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1420         /* We need to EOI the IPI since not all platforms reset the MPIC
1421          * on boot and new interrupts wouldn't get delivered otherwise.
1422          */
1423         mpic_eoi(mpic);
1424
1425         spin_unlock_irqrestore(&mpic_lock, flags);
1426 }
1427
1428
1429 void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask)
1430 {
1431         struct mpic *mpic = mpic_primary;
1432
1433         BUG_ON(mpic == NULL);
1434
1435 #ifdef DEBUG_IPI
1436         DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no);
1437 #endif
1438
1439         mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) +
1440                        ipi_no * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE),
1441                        mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0]));
1442 }
1443
1444 static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg)
1445 {
1446         u32 src;
1447
1448         src = mpic_cpu_read(reg) & MPIC_INFO(VECPRI_VECTOR_MASK);
1449 #ifdef DEBUG_LOW
1450         DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic->name, reg, src);
1451 #endif
1452         if (unlikely(src == mpic->spurious_vec)) {
1453                 if (mpic->flags & MPIC_SPV_EOI)
1454                         mpic_eoi(mpic);
1455                 return NO_IRQ;
1456         }
1457         if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1458                 if (printk_ratelimit())
1459                         printk(KERN_WARNING "%s: Got protected source %d !\n",
1460                                mpic->name, (int)src);
1461                 mpic_eoi(mpic);
1462                 return NO_IRQ;
1463         }
1464
1465         return irq_linear_revmap(mpic->irqhost, src);
1466 }
1467
1468 unsigned int mpic_get_one_irq(struct mpic *mpic)
1469 {
1470         return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK));
1471 }
1472
1473 unsigned int mpic_get_irq(void)
1474 {
1475         struct mpic *mpic = mpic_primary;
1476
1477         BUG_ON(mpic == NULL);
1478
1479         return mpic_get_one_irq(mpic);
1480 }
1481
1482 unsigned int mpic_get_mcirq(void)
1483 {
1484         struct mpic *mpic = mpic_primary;
1485
1486         BUG_ON(mpic == NULL);
1487
1488         return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_MCACK));
1489 }
1490
1491 #ifdef CONFIG_SMP
1492 void mpic_request_ipis(void)
1493 {
1494         struct mpic *mpic = mpic_primary;
1495         long i, err;
1496         static char *ipi_names[] = {
1497                 "IPI0 (call function)",
1498                 "IPI1 (reschedule)",
1499                 "IPI2 (call function single)",
1500                 "IPI3 (debugger break)",
1501         };
1502         BUG_ON(mpic == NULL);
1503
1504         printk(KERN_INFO "mpic: requesting IPIs ... \n");
1505
1506         for (i = 0; i < 4; i++) {
1507                 unsigned int vipi = irq_create_mapping(mpic->irqhost,
1508                                                        mpic->ipi_vecs[0] + i);
1509                 if (vipi == NO_IRQ) {
1510                         printk(KERN_ERR "Failed to map IPI %ld\n", i);
1511                         break;
1512                 }
1513                 err = request_irq(vipi, mpic_ipi_action,
1514                                   IRQF_DISABLED|IRQF_PERCPU,
1515                                   ipi_names[i], (void *)i);
1516                 if (err) {
1517                         printk(KERN_ERR "Request of irq %d for IPI %ld failed\n",
1518                                vipi, i);
1519                         break;
1520                 }
1521         }
1522 }
1523
1524 void smp_mpic_message_pass(int target, int msg)
1525 {
1526         /* make sure we're sending something that translates to an IPI */
1527         if ((unsigned int)msg > 3) {
1528                 printk("SMP %d: smp_message_pass: unknown msg %d\n",
1529                        smp_processor_id(), msg);
1530                 return;
1531         }
1532         switch (target) {
1533         case MSG_ALL:
1534                 mpic_send_ipi(msg, 0xffffffff);
1535                 break;
1536         case MSG_ALL_BUT_SELF:
1537                 mpic_send_ipi(msg, 0xffffffff & ~(1 << smp_processor_id()));
1538                 break;
1539         default:
1540                 mpic_send_ipi(msg, 1 << target);
1541                 break;
1542         }
1543 }
1544
1545 int __init smp_mpic_probe(void)
1546 {
1547         int nr_cpus;
1548
1549         DBG("smp_mpic_probe()...\n");
1550
1551         nr_cpus = cpus_weight(cpu_possible_map);
1552
1553         DBG("nr_cpus: %d\n", nr_cpus);
1554
1555         if (nr_cpus > 1)
1556                 mpic_request_ipis();
1557
1558         return nr_cpus;
1559 }
1560
1561 void __devinit smp_mpic_setup_cpu(int cpu)
1562 {
1563         mpic_setup_this_cpu();
1564 }
1565 #endif /* CONFIG_SMP */
1566
1567 #ifdef CONFIG_PM
1568 static int mpic_suspend(struct sys_device *dev, pm_message_t state)
1569 {
1570         struct mpic *mpic = container_of(dev, struct mpic, sysdev);
1571         int i;
1572
1573         for (i = 0; i < mpic->num_sources; i++) {
1574                 mpic->save_data[i].vecprio =
1575                         mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI));
1576                 mpic->save_data[i].dest =
1577                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION));
1578         }
1579
1580         return 0;
1581 }
1582
1583 static int mpic_resume(struct sys_device *dev)
1584 {
1585         struct mpic *mpic = container_of(dev, struct mpic, sysdev);
1586         int i;
1587
1588         for (i = 0; i < mpic->num_sources; i++) {
1589                 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI),
1590                                mpic->save_data[i].vecprio);
1591                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1592                                mpic->save_data[i].dest);
1593
1594 #ifdef CONFIG_MPIC_U3_HT_IRQS
1595         {
1596                 struct mpic_irq_fixup *fixup = &mpic->fixups[i];
1597
1598                 if (fixup->base) {
1599                         /* we use the lowest bit in an inverted meaning */
1600                         if ((mpic->save_data[i].fixup_data & 1) == 0)
1601                                 continue;
1602
1603                         /* Enable and configure */
1604                         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
1605
1606                         writel(mpic->save_data[i].fixup_data & ~1,
1607                                fixup->base + 4);
1608                 }
1609         }
1610 #endif
1611         } /* end for loop */
1612
1613         return 0;
1614 }
1615 #endif
1616
1617 static struct sysdev_class mpic_sysclass = {
1618 #ifdef CONFIG_PM
1619         .resume = mpic_resume,
1620         .suspend = mpic_suspend,
1621 #endif
1622         .name = "mpic",
1623 };
1624
1625 static int mpic_init_sys(void)
1626 {
1627         struct mpic *mpic = mpics;
1628         int error, id = 0;
1629
1630         error = sysdev_class_register(&mpic_sysclass);
1631
1632         while (mpic && !error) {
1633                 mpic->sysdev.cls = &mpic_sysclass;
1634                 mpic->sysdev.id = id++;
1635                 error = sysdev_register(&mpic->sysdev);
1636                 mpic = mpic->next;
1637         }
1638         return error;
1639 }
1640
1641 device_initcall(mpic_init_sys);