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 #ifdef CONFIG_SMP
 567 static int irq_choose_cpu(unsigned int virt_irq)
 568 {
 569         cpumask_t mask = irq_desc[virt_irq].affinity;
 570         int cpuid;
 571
 572         if (cpus_equal(mask, CPU_MASK_ALL)) {
 573                 static int irq_rover;
 574                 static DEFINE_SPINLOCK(irq_rover_lock);
 575                 unsigned long flags;
 576
 577                 /* Round-robin distribution... */
 578         do_round_robin:
 579                 spin_lock_irqsave(&irq_rover_lock, flags);
 580
 581                 while (!cpu_online(irq_rover)) {
 582                         if (++irq_rover >= NR_CPUS)
 583                                 irq_rover = 0;
 584                 }
 585                 cpuid = irq_rover;
 586                 do {
 587                         if (++irq_rover >= NR_CPUS)
 588                                 irq_rover = 0;
 589                 } while (!cpu_online(irq_rover));
 590
 591                 spin_unlock_irqrestore(&irq_rover_lock, flags);
 592         } else {
 593                 cpumask_t tmp;
 594
 595                 cpus_and(tmp, cpu_online_map, mask);
 596
 597                 if (cpus_empty(tmp))
 598                         goto do_round_robin;
 599
 600                 cpuid = first_cpu(tmp);
 601         }
 602
 603         return cpuid;
 604 }
 605 #else
 606 static int irq_choose_cpu(unsigned int virt_irq)
 607 {
 608         return hard_smp_processor_id();
 609 }
 610 #endif
 611
 612 #define mpic_irq_to_hw(virq)    ((unsigned int)irq_map[virq].hwirq)
 613
 614 /* Find an mpic associated with a given linux interrupt */
 615 static struct mpic *mpic_find(unsigned int irq, unsigned int *is_ipi)
 616 {
 617         unsigned int src = mpic_irq_to_hw(irq);
 618         struct mpic *mpic;
 619
 620         if (irq < NUM_ISA_INTERRUPTS)
 621                 return NULL;
 622
 623         mpic = irq_desc[irq].chip_data;
 624
 625         if (is_ipi)
 626                 *is_ipi = (src >= mpic->ipi_vecs[0] &&
 627                            src <= mpic->ipi_vecs[3]);
 628
 629         return mpic;
 630 }
 631
 632 /* Convert a cpu mask from logical to physical cpu numbers. */
 633 static inline u32 mpic_physmask(u32 cpumask)
 634 {
 635         int i;
 636         u32 mask = 0;
 637
 638         for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1)
 639                 mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
 640         return mask;
 641 }
 642
 643 #ifdef CONFIG_SMP
 644 /* Get the mpic structure from the IPI number */
 645 static inline struct mpic * mpic_from_ipi(unsigned int ipi)
 646 {
 647         return irq_desc[ipi].chip_data;
 648 }
 649 #endif
 650
 651 /* Get the mpic structure from the irq number */
 652 static inline struct mpic * mpic_from_irq(unsigned int irq)
 653 {
 654         return irq_desc[irq].chip_data;
 655 }
 656
 657 /* Send an EOI */
 658 static inline void mpic_eoi(struct mpic *mpic)
 659 {
 660         mpic_cpu_write(MPIC_INFO(CPU_EOI), 0);
 661         (void)mpic_cpu_read(MPIC_INFO(CPU_WHOAMI));
 662 }
 663
 664 #ifdef CONFIG_SMP
 665 static irqreturn_t mpic_ipi_action(int irq, void *data)
 666 {
 667         long ipi = (long)data;
 668
 669         smp_message_recv(ipi);
 670
 671         return IRQ_HANDLED;
 672 }
 673 #endif /* CONFIG_SMP */
 674
 675 /*
 676  * Linux descriptor level callbacks
 677  */
 678
 679
 680 void mpic_unmask_irq(unsigned int irq)
 681 {
 682         unsigned int loops = 100000;
 683         struct mpic *mpic = mpic_from_irq(irq);
 684         unsigned int src = mpic_irq_to_hw(irq);
 685
 686         DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, irq, src);
 687
 688         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
 689                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) &
 690                        ~MPIC_VECPRI_MASK);
 691         /* make sure mask gets to controller before we return to user */
 692         do {
 693                 if (!loops--) {
 694                         printk(KERN_ERR "mpic_enable_irq timeout\n");
 695                         break;
 696                 }
 697         } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK);
 698 }
 699
 700 void mpic_mask_irq(unsigned int irq)
 701 {
 702         unsigned int loops = 100000;
 703         struct mpic *mpic = mpic_from_irq(irq);
 704         unsigned int src = mpic_irq_to_hw(irq);
 705
 706         DBG("%s: disable_irq: %d (src %d)\n", mpic->name, irq, src);
 707
 708         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
 709                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) |
 710                        MPIC_VECPRI_MASK);
 711
 712         /* make sure mask gets to controller before we return to user */
 713         do {
 714                 if (!loops--) {
 715                         printk(KERN_ERR "mpic_enable_irq timeout\n");
 716                         break;
 717                 }
 718         } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK));
 719 }
 720
 721 void mpic_end_irq(unsigned int irq)
 722 {
 723         struct mpic *mpic = mpic_from_irq(irq);
 724
 725 #ifdef DEBUG_IRQ
 726         DBG("%s: end_irq: %d\n", mpic->name, irq);
 727 #endif
 728         /* We always EOI on end_irq() even for edge interrupts since that
 729          * should only lower the priority, the MPIC should have properly
 730          * latched another edge interrupt coming in anyway
 731          */
 732
 733         mpic_eoi(mpic);
 734 }
 735
 736 #ifdef CONFIG_MPIC_U3_HT_IRQS
 737
 738 static void mpic_unmask_ht_irq(unsigned int irq)
 739 {
 740         struct mpic *mpic = mpic_from_irq(irq);
 741         unsigned int src = mpic_irq_to_hw(irq);
 742
 743         mpic_unmask_irq(irq);
 744
 745         if (irq_desc[irq].status & IRQ_LEVEL)
 746                 mpic_ht_end_irq(mpic, src);
 747 }
 748
 749 static unsigned int mpic_startup_ht_irq(unsigned int irq)
 750 {
 751         struct mpic *mpic = mpic_from_irq(irq);
 752         unsigned int src = mpic_irq_to_hw(irq);
 753
 754         mpic_unmask_irq(irq);
 755         mpic_startup_ht_interrupt(mpic, src, irq_desc[irq].status);
 756
 757         return 0;
 758 }
 759
 760 static void mpic_shutdown_ht_irq(unsigned int irq)
 761 {
 762         struct mpic *mpic = mpic_from_irq(irq);
 763         unsigned int src = mpic_irq_to_hw(irq);
 764
 765         mpic_shutdown_ht_interrupt(mpic, src, irq_desc[irq].status);
 766         mpic_mask_irq(irq);
 767 }
 768
 769 static void mpic_end_ht_irq(unsigned int irq)
 770 {
 771         struct mpic *mpic = mpic_from_irq(irq);
 772         unsigned int src = mpic_irq_to_hw(irq);
 773
 774 #ifdef DEBUG_IRQ
 775         DBG("%s: end_irq: %d\n", mpic->name, irq);
 776 #endif
 777         /* We always EOI on end_irq() even for edge interrupts since that
 778          * should only lower the priority, the MPIC should have properly
 779          * latched another edge interrupt coming in anyway
 780          */
 781
 782         if (irq_desc[irq].status & IRQ_LEVEL)
 783                 mpic_ht_end_irq(mpic, src);
 784         mpic_eoi(mpic);
 785 }
 786 #endif /* !CONFIG_MPIC_U3_HT_IRQS */
 787
 788 #ifdef CONFIG_SMP
 789
 790 static void mpic_unmask_ipi(unsigned int irq)
 791 {
 792         struct mpic *mpic = mpic_from_ipi(irq);
 793         unsigned int src = mpic_irq_to_hw(irq) - mpic->ipi_vecs[0];
 794
 795         DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, irq, src);
 796         mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
 797 }
 798
 799 static void mpic_mask_ipi(unsigned int irq)
 800 {
 801         /* NEVER disable an IPI... that's just plain wrong! */
 802 }
 803
 804 static void mpic_end_ipi(unsigned int irq)
 805 {
 806         struct mpic *mpic = mpic_from_ipi(irq);
 807
 808         /*
 809          * IPIs are marked IRQ_PER_CPU. This has the side effect of
 810          * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
 811          * applying to them. We EOI them late to avoid re-entering.
 812          * We mark IPI's with IRQF_DISABLED as they must run with
 813          * irqs disabled.
 814          */
 815         mpic_eoi(mpic);
 816 }
 817
 818 #endif /* CONFIG_SMP */
 819
 820 void mpic_set_affinity(unsigned int irq, cpumask_t cpumask)
 821 {
 822         struct mpic *mpic = mpic_from_irq(irq);
 823         unsigned int src = mpic_irq_to_hw(irq);
 824
 825         if (mpic->flags & MPIC_SINGLE_DEST_CPU) {
 826                 int cpuid = irq_choose_cpu(irq);
 827
 828                 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
 829         } else {
 830                 cpumask_t tmp;
 831
 832                 cpus_and(tmp, cpumask, cpu_online_map);
 833
 834                 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION),
 835                                mpic_physmask(cpus_addr(tmp)[0]));
 836         }
 837 }
 838
 839 static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type)
 840 {
 841         /* Now convert sense value */
 842         switch(type & IRQ_TYPE_SENSE_MASK) {
 843         case IRQ_TYPE_EDGE_RISING:
 844                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
 845                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
 846         case IRQ_TYPE_EDGE_FALLING:
 847         case IRQ_TYPE_EDGE_BOTH:
 848                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
 849                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
 850         case IRQ_TYPE_LEVEL_HIGH:
 851                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
 852                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
 853         case IRQ_TYPE_LEVEL_LOW:
 854         default:
 855                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
 856                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
 857         }
 858 }
 859
 860 int mpic_set_irq_type(unsigned int virq, unsigned int flow_type)
 861 {
 862         struct mpic *mpic = mpic_from_irq(virq);
 863         unsigned int src = mpic_irq_to_hw(virq);
 864         struct irq_desc *desc = get_irq_desc(virq);
 865         unsigned int vecpri, vold, vnew;
 866
 867         DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n",
 868             mpic, virq, src, flow_type);
 869
 870         if (src >= mpic->irq_count)
 871                 return -EINVAL;
 872
 873         if (flow_type == IRQ_TYPE_NONE)
 874                 if (mpic->senses && src < mpic->senses_count)
 875                         flow_type = mpic->senses[src];
 876         if (flow_type == IRQ_TYPE_NONE)
 877                 flow_type = IRQ_TYPE_LEVEL_LOW;
 878
 879         desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
 880         desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
 881         if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
 882                 desc->status |= IRQ_LEVEL;
 883
 884         if (mpic_is_ht_interrupt(mpic, src))
 885                 vecpri = MPIC_VECPRI_POLARITY_POSITIVE |
 886                         MPIC_VECPRI_SENSE_EDGE;
 887         else
 888                 vecpri = mpic_type_to_vecpri(mpic, flow_type);
 889
 890         vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
 891         vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) |
 892                         MPIC_INFO(VECPRI_SENSE_MASK));
 893         vnew |= vecpri;
 894         if (vold != vnew)
 895                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew);
 896
 897         return 0;
 898 }
 899
 900 void mpic_set_vector(unsigned int virq, unsigned int vector)
 901 {
 902         struct mpic *mpic = mpic_from_irq(virq);
 903         unsigned int src = mpic_irq_to_hw(virq);
 904         unsigned int vecpri;
 905
 906         DBG("mpic: set_vector(mpic:@%p,virq:%d,src:%d,vector:0x%x)\n",
 907             mpic, virq, src, vector);
 908
 909         if (src >= mpic->irq_count)
 910                 return;
 911
 912         vecpri = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
 913         vecpri = vecpri & ~MPIC_INFO(VECPRI_VECTOR_MASK);
 914         vecpri |= vector;
 915         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
 916 }
 917
 918 static struct irq_chip mpic_irq_chip = {
 919         .mask           = mpic_mask_irq,
 920         .unmask         = mpic_unmask_irq,
 921         .eoi            = mpic_end_irq,
 922         .set_type       = mpic_set_irq_type,
 923 };
 924
 925 #ifdef CONFIG_SMP
 926 static struct irq_chip mpic_ipi_chip = {
 927         .mask           = mpic_mask_ipi,
 928         .unmask         = mpic_unmask_ipi,
 929         .eoi            = mpic_end_ipi,
 930 };
 931 #endif /* CONFIG_SMP */
 932
 933 #ifdef CONFIG_MPIC_U3_HT_IRQS
 934 static struct irq_chip mpic_irq_ht_chip = {
 935         .startup        = mpic_startup_ht_irq,
 936         .shutdown       = mpic_shutdown_ht_irq,
 937         .mask           = mpic_mask_irq,
 938         .unmask         = mpic_unmask_ht_irq,
 939         .eoi            = mpic_end_ht_irq,
 940         .set_type       = mpic_set_irq_type,
 941 };
 942 #endif /* CONFIG_MPIC_U3_HT_IRQS */
 943
 944
 945 static int mpic_host_match(struct irq_host *h, struct device_node *node)
 946 {
 947         /* Exact match, unless mpic node is NULL */
 948         return h->of_node == NULL || h->of_node == node;
 949 }
 950
 951 static int mpic_host_map(struct irq_host *h, unsigned int virq,
 952                          irq_hw_number_t hw)
 953 {
 954         struct mpic *mpic = h->host_data;
 955         struct irq_chip *chip;
 956
 957         DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw);
 958
 959         if (hw == mpic->spurious_vec)
 960                 return -EINVAL;
 961         if (mpic->protected && test_bit(hw, mpic->protected))
 962                 return -EINVAL;
 963
 964 #ifdef CONFIG_SMP
 965         else if (hw >= mpic->ipi_vecs[0]) {
 966                 WARN_ON(!(mpic->flags & MPIC_PRIMARY));
 967
 968                 DBG("mpic: mapping as IPI\n");
 969                 set_irq_chip_data(virq, mpic);
 970                 set_irq_chip_and_handler(virq, &mpic->hc_ipi,
 971                                          handle_percpu_irq);
 972                 return 0;
 973         }
 974 #endif /* CONFIG_SMP */
 975
 976         if (hw >= mpic->irq_count)
 977                 return -EINVAL;
 978
 979         mpic_msi_reserve_hwirq(mpic, hw);
 980
 981         /* Default chip */
 982         chip = &mpic->hc_irq;
 983
 984 #ifdef CONFIG_MPIC_U3_HT_IRQS
 985         /* Check for HT interrupts, override vecpri */
 986         if (mpic_is_ht_interrupt(mpic, hw))
 987                 chip = &mpic->hc_ht_irq;
 988 #endif /* CONFIG_MPIC_U3_HT_IRQS */
 989
 990         DBG("mpic: mapping to irq chip @%p\n", chip);
 991
 992         set_irq_chip_data(virq, mpic);
 993         set_irq_chip_and_handler(virq, chip, handle_fasteoi_irq);
 994
 995         /* Set default irq type */
 996         set_irq_type(virq, IRQ_TYPE_NONE);
 997
 998         return 0;
 999 }
1000
1001 static int mpic_host_xlate(struct irq_host *h, struct device_node *ct,
1002                            u32 *intspec, unsigned int intsize,
1003                            irq_hw_number_t *out_hwirq, unsigned int *out_flags)
1004
1005 {
1006         static unsigned char map_mpic_senses[4] = {
1007                 IRQ_TYPE_EDGE_RISING,
1008                 IRQ_TYPE_LEVEL_LOW,
1009                 IRQ_TYPE_LEVEL_HIGH,
1010                 IRQ_TYPE_EDGE_FALLING,
1011         };
1012
1013         *out_hwirq = intspec[0];
1014         if (intsize > 1) {
1015                 u32 mask = 0x3;
1016
1017                 /* Apple invented a new race of encoding on machines with
1018                  * an HT APIC. They encode, among others, the index within
1019                  * the HT APIC. We don't care about it here since thankfully,
1020                  * it appears that they have the APIC already properly
1021                  * configured, and thus our current fixup code that reads the
1022                  * APIC config works fine. However, we still need to mask out
1023                  * bits in the specifier to make sure we only get bit 0 which
1024                  * is the level/edge bit (the only sense bit exposed by Apple),
1025                  * as their bit 1 means something else.
1026                  */
1027                 if (machine_is(powermac))
1028                         mask = 0x1;
1029                 *out_flags = map_mpic_senses[intspec[1] & mask];
1030         } else
1031                 *out_flags = IRQ_TYPE_NONE;
1032
1033         DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
1034             intsize, intspec[0], intspec[1], *out_hwirq, *out_flags);
1035
1036         return 0;
1037 }
1038
1039 static struct irq_host_ops mpic_host_ops = {
1040         .match = mpic_host_match,
1041         .map = mpic_host_map,
1042         .xlate = mpic_host_xlate,
1043 };
1044
1045 /*
1046  * Exported functions
1047  */
1048
1049 struct mpic * __init mpic_alloc(struct device_node *node,
1050                                 phys_addr_t phys_addr,
1051                                 unsigned int flags,
1052                                 unsigned int isu_size,
1053                                 unsigned int irq_count,
1054                                 const char *name)
1055 {
1056         struct mpic     *mpic;
1057         u32             greg_feature;
1058         const char      *vers;
1059         int             i;
1060         int             intvec_top;
1061         u64             paddr = phys_addr;
1062
1063         mpic = alloc_bootmem(sizeof(struct mpic));
1064         if (mpic == NULL)
1065                 return NULL;
1066
1067         memset(mpic, 0, sizeof(struct mpic));
1068         mpic->name = name;
1069
1070         mpic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
1071                                        isu_size, &mpic_host_ops,
1072                                        flags & MPIC_LARGE_VECTORS ? 2048 : 256);
1073         if (mpic->irqhost == NULL)
1074                 return NULL;
1075
1076         mpic->irqhost->host_data = mpic;
1077         mpic->hc_irq = mpic_irq_chip;
1078         mpic->hc_irq.typename = name;
1079         if (flags & MPIC_PRIMARY)
1080                 mpic->hc_irq.set_affinity = mpic_set_affinity;
1081 #ifdef CONFIG_MPIC_U3_HT_IRQS
1082         mpic->hc_ht_irq = mpic_irq_ht_chip;
1083         mpic->hc_ht_irq.typename = name;
1084         if (flags & MPIC_PRIMARY)
1085                 mpic->hc_ht_irq.set_affinity = mpic_set_affinity;
1086 #endif /* CONFIG_MPIC_U3_HT_IRQS */
1087
1088 #ifdef CONFIG_SMP
1089         mpic->hc_ipi = mpic_ipi_chip;
1090         mpic->hc_ipi.typename = name;
1091 #endif /* CONFIG_SMP */
1092
1093         mpic->flags = flags;
1094         mpic->isu_size = isu_size;
1095         mpic->irq_count = irq_count;
1096         mpic->num_sources = 0; /* so far */
1097
1098         if (flags & MPIC_LARGE_VECTORS)
1099                 intvec_top = 2047;
1100         else
1101                 intvec_top = 255;
1102
1103         mpic->timer_vecs[0] = intvec_top - 8;
1104         mpic->timer_vecs[1] = intvec_top - 7;
1105         mpic->timer_vecs[2] = intvec_top - 6;
1106         mpic->timer_vecs[3] = intvec_top - 5;
1107         mpic->ipi_vecs[0]   = intvec_top - 4;
1108         mpic->ipi_vecs[1]   = intvec_top - 3;
1109         mpic->ipi_vecs[2]   = intvec_top - 2;
1110         mpic->ipi_vecs[3]   = intvec_top - 1;
1111         mpic->spurious_vec  = intvec_top;
1112
1113         /* Check for "big-endian" in device-tree */
1114         if (node && of_get_property(node, "big-endian", NULL) != NULL)
1115                 mpic->flags |= MPIC_BIG_ENDIAN;
1116
1117         /* Look for protected sources */
1118         if (node) {
1119                 int psize;
1120                 unsigned int bits, mapsize;
1121                 const u32 *psrc =
1122                         of_get_property(node, "protected-sources", &psize);
1123                 if (psrc) {
1124                         psize /= 4;
1125                         bits = intvec_top + 1;
1126                         mapsize = BITS_TO_LONGS(bits) * sizeof(unsigned long);
1127                         mpic->protected = alloc_bootmem(mapsize);
1128                         BUG_ON(mpic->protected == NULL);
1129                         memset(mpic->protected, 0, mapsize);
1130                         for (i = 0; i < psize; i++) {
1131                                 if (psrc[i] > intvec_top)
1132                                         continue;
1133                                 __set_bit(psrc[i], mpic->protected);
1134                         }
1135                 }
1136         }
1137
1138 #ifdef CONFIG_MPIC_WEIRD
1139         mpic->hw_set = mpic_infos[MPIC_GET_REGSET(flags)];
1140 #endif
1141
1142         /* default register type */
1143         mpic->reg_type = (flags & MPIC_BIG_ENDIAN) ?
1144                 mpic_access_mmio_be : mpic_access_mmio_le;
1145
1146         /* If no physical address is passed in, a device-node is mandatory */
1147         BUG_ON(paddr == 0 && node == NULL);
1148
1149         /* If no physical address passed in, check if it's dcr based */
1150         if (paddr == 0 && of_get_property(node, "dcr-reg", NULL) != NULL) {
1151 #ifdef CONFIG_PPC_DCR
1152                 mpic->flags |= MPIC_USES_DCR;
1153                 mpic->reg_type = mpic_access_dcr;
1154 #else
1155                 BUG();
1156 #endif /* CONFIG_PPC_DCR */
1157         }
1158
1159         /* If the MPIC is not DCR based, and no physical address was passed
1160          * in, try to obtain one
1161          */
1162         if (paddr == 0 && !(mpic->flags & MPIC_USES_DCR)) {
1163                 const u32 *reg = of_get_property(node, "reg", NULL);
1164                 BUG_ON(reg == NULL);
1165                 paddr = of_translate_address(node, reg);
1166                 BUG_ON(paddr == OF_BAD_ADDR);
1167         }
1168
1169         /* Map the global registers */
1170         mpic_map(mpic, paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
1171         mpic_map(mpic, paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
1172
1173         /* Reset */
1174         if (flags & MPIC_WANTS_RESET) {
1175                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1176                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1177                            | MPIC_GREG_GCONF_RESET);
1178                 while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1179                        & MPIC_GREG_GCONF_RESET)
1180                         mb();
1181         }
1182
1183         if (flags & MPIC_ENABLE_MCK)
1184                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1185                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1186                            | MPIC_GREG_GCONF_MCK);
1187
1188         /* Read feature register, calculate num CPUs and, for non-ISU
1189          * MPICs, num sources as well. On ISU MPICs, sources are counted
1190          * as ISUs are added
1191          */
1192         greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
1193         mpic->num_cpus = ((greg_feature & MPIC_GREG_FEATURE_LAST_CPU_MASK)
1194                           >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
1195         if (isu_size == 0) {
1196                 if (flags & MPIC_BROKEN_FRR_NIRQS)
1197                         mpic->num_sources = mpic->irq_count;
1198                 else
1199                         mpic->num_sources =
1200                                 ((greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
1201                                  >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
1202         }
1203
1204         /* Map the per-CPU registers */
1205         for (i = 0; i < mpic->num_cpus; i++) {
1206                 mpic_map(mpic, paddr, &mpic->cpuregs[i],
1207                          MPIC_INFO(CPU_BASE) + i * MPIC_INFO(CPU_STRIDE),
1208                          0x1000);
1209         }
1210
1211         /* Initialize main ISU if none provided */
1212         if (mpic->isu_size == 0) {
1213                 mpic->isu_size = mpic->num_sources;
1214                 mpic_map(mpic, paddr, &mpic->isus[0],
1215                          MPIC_INFO(IRQ_BASE), MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1216         }
1217         mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
1218         mpic->isu_mask = (1 << mpic->isu_shift) - 1;
1219
1220         /* Display version */
1221         switch (greg_feature & MPIC_GREG_FEATURE_VERSION_MASK) {
1222         case 1:
1223                 vers = "1.0";
1224                 break;
1225         case 2:
1226                 vers = "1.2";
1227                 break;
1228         case 3:
1229                 vers = "1.3";
1230                 break;
1231         default:
1232                 vers = "<unknown>";
1233                 break;
1234         }
1235         printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx,"
1236                " max %d CPUs\n",
1237                name, vers, (unsigned long long)paddr, mpic->num_cpus);
1238         printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n",
1239                mpic->isu_size, mpic->isu_shift, mpic->isu_mask);
1240
1241         mpic->next = mpics;
1242         mpics = mpic;
1243
1244         if (flags & MPIC_PRIMARY) {
1245                 mpic_primary = mpic;
1246                 irq_set_default_host(mpic->irqhost);
1247         }
1248
1249         return mpic;
1250 }
1251
1252 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
1253                             phys_addr_t paddr)
1254 {
1255         unsigned int isu_first = isu_num * mpic->isu_size;
1256
1257         BUG_ON(isu_num >= MPIC_MAX_ISU);
1258
1259         mpic_map(mpic, paddr, &mpic->isus[isu_num], 0,
1260                  MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1261         if ((isu_first + mpic->isu_size) > mpic->num_sources)
1262                 mpic->num_sources = isu_first + mpic->isu_size;
1263 }
1264
1265 void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count)
1266 {
1267         mpic->senses = senses;
1268         mpic->senses_count = count;
1269 }
1270
1271 void __init mpic_init(struct mpic *mpic)
1272 {
1273         int i;
1274         int cpu;
1275
1276         BUG_ON(mpic->num_sources == 0);
1277
1278         printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
1279
1280         /* Set current processor priority to max */
1281         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1282
1283         /* Initialize timers: just disable them all */
1284         for (i = 0; i < 4; i++) {
1285                 mpic_write(mpic->tmregs,
1286                            i * MPIC_INFO(TIMER_STRIDE) +
1287                            MPIC_INFO(TIMER_DESTINATION), 0);
1288                 mpic_write(mpic->tmregs,
1289                            i * MPIC_INFO(TIMER_STRIDE) +
1290                            MPIC_INFO(TIMER_VECTOR_PRI),
1291                            MPIC_VECPRI_MASK |
1292                            (mpic->timer_vecs[0] + i));
1293         }
1294
1295         /* Initialize IPIs to our reserved vectors and mark them disabled for now */
1296         mpic_test_broken_ipi(mpic);
1297         for (i = 0; i < 4; i++) {
1298                 mpic_ipi_write(i,
1299                                MPIC_VECPRI_MASK |
1300                                (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
1301                                (mpic->ipi_vecs[0] + i));
1302         }
1303
1304         /* Initialize interrupt sources */
1305         if (mpic->irq_count == 0)
1306                 mpic->irq_count = mpic->num_sources;
1307
1308         /* Do the HT PIC fixups on U3 broken mpic */
1309         DBG("MPIC flags: %x\n", mpic->flags);
1310         if ((mpic->flags & MPIC_U3_HT_IRQS) && (mpic->flags & MPIC_PRIMARY)) {
1311                 mpic_scan_ht_pics(mpic);
1312                 mpic_u3msi_init(mpic);
1313         }
1314
1315         mpic_pasemi_msi_init(mpic);
1316
1317         if (mpic->flags & MPIC_PRIMARY)
1318                 cpu = hard_smp_processor_id();
1319         else
1320                 cpu = 0;
1321
1322         for (i = 0; i < mpic->num_sources; i++) {
1323                 /* start with vector = source number, and masked */
1324                 u32 vecpri = MPIC_VECPRI_MASK | i |
1325                         (8 << MPIC_VECPRI_PRIORITY_SHIFT);
1326
1327                 /* check if protected */
1328                 if (mpic->protected && test_bit(i, mpic->protected))
1329                         continue;
1330                 /* init hw */
1331                 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
1332                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1 << cpu);
1333         }
1334
1335         /* Init spurious vector */
1336         mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), mpic->spurious_vec);
1337
1338         /* Disable 8259 passthrough, if supported */
1339         if (!(mpic->flags & MPIC_NO_PTHROU_DIS))
1340                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1341                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1342                            | MPIC_GREG_GCONF_8259_PTHROU_DIS);
1343
1344         if (mpic->flags & MPIC_NO_BIAS)
1345                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1346                         mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1347                         | MPIC_GREG_GCONF_NO_BIAS);
1348
1349         /* Set current processor priority to 0 */
1350         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1351
1352 #ifdef CONFIG_PM
1353         /* allocate memory to save mpic state */
1354         mpic->save_data = alloc_bootmem(mpic->num_sources * sizeof(struct mpic_irq_save));
1355         BUG_ON(mpic->save_data == NULL);
1356 #endif
1357 }
1358
1359 void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)
1360 {
1361         u32 v;
1362
1363         v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1364         v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK;
1365         v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio);
1366         mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1367 }
1368
1369 void __init mpic_set_serial_int(struct mpic *mpic, int enable)
1370 {
1371         unsigned long flags;
1372         u32 v;
1373
1374         spin_lock_irqsave(&mpic_lock, flags);
1375         v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1376         if (enable)
1377                 v |= MPIC_GREG_GLOBAL_CONF_1_SIE;
1378         else
1379                 v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE;
1380         mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1381         spin_unlock_irqrestore(&mpic_lock, flags);
1382 }
1383
1384 void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
1385 {
1386         unsigned int is_ipi;
1387         struct mpic *mpic = mpic_find(irq, &is_ipi);
1388         unsigned int src = mpic_irq_to_hw(irq);
1389         unsigned long flags;
1390         u32 reg;
1391
1392         if (!mpic)
1393                 return;
1394
1395         spin_lock_irqsave(&mpic_lock, flags);
1396         if (is_ipi) {
1397                 reg = mpic_ipi_read(src - mpic->ipi_vecs[0]) &
1398                         ~MPIC_VECPRI_PRIORITY_MASK;
1399                 mpic_ipi_write(src - mpic->ipi_vecs[0],
1400                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1401         } else {
1402                 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI))
1403                         & ~MPIC_VECPRI_PRIORITY_MASK;
1404                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
1405                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1406         }
1407         spin_unlock_irqrestore(&mpic_lock, flags);
1408 }
1409
1410 void mpic_setup_this_cpu(void)
1411 {
1412 #ifdef CONFIG_SMP
1413         struct mpic *mpic = mpic_primary;
1414         unsigned long flags;
1415         u32 msk = 1 << hard_smp_processor_id();
1416         unsigned int i;
1417
1418         BUG_ON(mpic == NULL);
1419
1420         DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1421
1422         spin_lock_irqsave(&mpic_lock, flags);
1423
1424         /* let the mpic know we want intrs. default affinity is 0xffffffff
1425          * until changed via /proc. That's how it's done on x86. If we want
1426          * it differently, then we should make sure we also change the default
1427          * values of irq_desc[].affinity in irq.c.
1428          */
1429         if (distribute_irqs) {
1430                 for (i = 0; i < mpic->num_sources ; i++)
1431                         mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1432                                 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk);
1433         }
1434
1435         /* Set current processor priority to 0 */
1436         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1437
1438         spin_unlock_irqrestore(&mpic_lock, flags);
1439 #endif /* CONFIG_SMP */
1440 }
1441
1442 int mpic_cpu_get_priority(void)
1443 {
1444         struct mpic *mpic = mpic_primary;
1445
1446         return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI));
1447 }
1448
1449 void mpic_cpu_set_priority(int prio)
1450 {
1451         struct mpic *mpic = mpic_primary;
1452
1453         prio &= MPIC_CPU_TASKPRI_MASK;
1454         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio);
1455 }
1456
1457 void mpic_teardown_this_cpu(int secondary)
1458 {
1459         struct mpic *mpic = mpic_primary;
1460         unsigned long flags;
1461         u32 msk = 1 << hard_smp_processor_id();
1462         unsigned int i;
1463
1464         BUG_ON(mpic == NULL);
1465
1466         DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1467         spin_lock_irqsave(&mpic_lock, flags);
1468
1469         /* let the mpic know we don't want intrs.  */
1470         for (i = 0; i < mpic->num_sources ; i++)
1471                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1472                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk);
1473
1474         /* Set current processor priority to max */
1475         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1476         /* We need to EOI the IPI since not all platforms reset the MPIC
1477          * on boot and new interrupts wouldn't get delivered otherwise.
1478          */
1479         mpic_eoi(mpic);
1480
1481         spin_unlock_irqrestore(&mpic_lock, flags);
1482 }
1483
1484
1485 void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask)
1486 {
1487         struct mpic *mpic = mpic_primary;
1488
1489         BUG_ON(mpic == NULL);
1490
1491 #ifdef DEBUG_IPI
1492         DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no);
1493 #endif
1494
1495         mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) +
1496                        ipi_no * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE),
1497                        mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0]));
1498 }
1499
1500 static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg)
1501 {
1502         u32 src;
1503
1504         src = mpic_cpu_read(reg) & MPIC_INFO(VECPRI_VECTOR_MASK);
1505 #ifdef DEBUG_LOW
1506         DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic->name, reg, src);
1507 #endif
1508         if (unlikely(src == mpic->spurious_vec)) {
1509                 if (mpic->flags & MPIC_SPV_EOI)
1510                         mpic_eoi(mpic);
1511                 return NO_IRQ;
1512         }
1513         if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1514                 if (printk_ratelimit())
1515                         printk(KERN_WARNING "%s: Got protected source %d !\n",
1516                                mpic->name, (int)src);
1517                 mpic_eoi(mpic);
1518                 return NO_IRQ;
1519         }
1520
1521         return irq_linear_revmap(mpic->irqhost, src);
1522 }
1523
1524 unsigned int mpic_get_one_irq(struct mpic *mpic)
1525 {
1526         return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK));
1527 }
1528
1529 unsigned int mpic_get_irq(void)
1530 {
1531         struct mpic *mpic = mpic_primary;
1532
1533         BUG_ON(mpic == NULL);
1534
1535         return mpic_get_one_irq(mpic);
1536 }
1537
1538 unsigned int mpic_get_mcirq(void)
1539 {
1540         struct mpic *mpic = mpic_primary;
1541
1542         BUG_ON(mpic == NULL);
1543
1544         return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_MCACK));
1545 }
1546
1547 #ifdef CONFIG_SMP
1548 void mpic_request_ipis(void)
1549 {
1550         struct mpic *mpic = mpic_primary;
1551         long i, err;
1552         static char *ipi_names[] = {
1553                 "IPI0 (call function)",
1554                 "IPI1 (reschedule)",
1555                 "IPI2 (call function single)",
1556                 "IPI3 (debugger break)",
1557         };
1558         BUG_ON(mpic == NULL);
1559
1560         printk(KERN_INFO "mpic: requesting IPIs ... \n");
1561
1562         for (i = 0; i < 4; i++) {
1563                 unsigned int vipi = irq_create_mapping(mpic->irqhost,
1564                                                        mpic->ipi_vecs[0] + i);
1565                 if (vipi == NO_IRQ) {
1566                         printk(KERN_ERR "Failed to map IPI %ld\n", i);
1567                         break;
1568                 }
1569                 err = request_irq(vipi, mpic_ipi_action,
1570                                   IRQF_DISABLED|IRQF_PERCPU,
1571                                   ipi_names[i], (void *)i);
1572                 if (err) {
1573                         printk(KERN_ERR "Request of irq %d for IPI %ld failed\n",
1574                                vipi, i);
1575                         break;
1576                 }
1577         }
1578 }
1579
1580 void smp_mpic_message_pass(int target, int msg)
1581 {
1582         /* make sure we're sending something that translates to an IPI */
1583         if ((unsigned int)msg > 3) {
1584                 printk("SMP %d: smp_message_pass: unknown msg %d\n",
1585                        smp_processor_id(), msg);
1586                 return;
1587         }
1588         switch (target) {
1589         case MSG_ALL:
1590                 mpic_send_ipi(msg, 0xffffffff);
1591                 break;
1592         case MSG_ALL_BUT_SELF:
1593                 mpic_send_ipi(msg, 0xffffffff & ~(1 << smp_processor_id()));
1594                 break;
1595         default:
1596                 mpic_send_ipi(msg, 1 << target);
1597                 break;
1598         }
1599 }
1600
1601 int __init smp_mpic_probe(void)
1602 {
1603         int nr_cpus;
1604
1605         DBG("smp_mpic_probe()...\n");
1606
1607         nr_cpus = cpus_weight(cpu_possible_map);
1608
1609         DBG("nr_cpus: %d\n", nr_cpus);
1610
1611         if (nr_cpus > 1)
1612                 mpic_request_ipis();
1613
1614         return nr_cpus;
1615 }
1616
1617 void __devinit smp_mpic_setup_cpu(int cpu)
1618 {
1619         mpic_setup_this_cpu();
1620 }
1621 #endif /* CONFIG_SMP */
1622
1623 #ifdef CONFIG_PM
1624 static int mpic_suspend(struct sys_device *dev, pm_message_t state)
1625 {
1626         struct mpic *mpic = container_of(dev, struct mpic, sysdev);
1627         int i;
1628
1629         for (i = 0; i < mpic->num_sources; i++) {
1630                 mpic->save_data[i].vecprio =
1631                         mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI));
1632                 mpic->save_data[i].dest =
1633                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION));
1634         }
1635
1636         return 0;
1637 }
1638
1639 static int mpic_resume(struct sys_device *dev)
1640 {
1641         struct mpic *mpic = container_of(dev, struct mpic, sysdev);
1642         int i;
1643
1644         for (i = 0; i < mpic->num_sources; i++) {
1645                 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI),
1646                                mpic->save_data[i].vecprio);
1647                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1648                                mpic->save_data[i].dest);
1649
1650 #ifdef CONFIG_MPIC_U3_HT_IRQS
1651         {
1652                 struct mpic_irq_fixup *fixup = &mpic->fixups[i];
1653
1654                 if (fixup->base) {
1655                         /* we use the lowest bit in an inverted meaning */
1656                         if ((mpic->save_data[i].fixup_data & 1) == 0)
1657                                 continue;
1658
1659                         /* Enable and configure */
1660                         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
1661
1662                         writel(mpic->save_data[i].fixup_data & ~1,
1663                                fixup->base + 4);
1664                 }
1665         }
1666 #endif
1667         } /* end for loop */
1668
1669         return 0;
1670 }
1671 #endif
1672
1673 static struct sysdev_class mpic_sysclass = {
1674 #ifdef CONFIG_PM
1675         .resume = mpic_resume,
1676         .suspend = mpic_suspend,
1677 #endif
1678         .name = "mpic",
1679 };
1680
1681 static int mpic_init_sys(void)
1682 {
1683         struct mpic *mpic = mpics;
1684         int error, id = 0;
1685
1686         error = sysdev_class_register(&mpic_sysclass);
1687
1688         while (mpic && !error) {
1689                 mpic->sysdev.cls = &mpic_sysclass;
1690                 mpic->sysdev.id = id++;
1691                 error = sysdev_register(&mpic->sysdev);
1692                 mpic = mpic->next;
1693         }
1694         return error;
1695 }
1696
1697 device_initcall(mpic_init_sys);