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 #include <linux/slab.h>
  30
  31 #include <asm/ptrace.h>
  32 #include <asm/signal.h>
  33 #include <asm/io.h>
  34 #include <asm/pgtable.h>
  35 #include <asm/irq.h>
  36 #include <asm/machdep.h>
  37 #include <asm/mpic.h>
  38 #include <asm/smp.h>
  39
  40 #include "mpic.h"
  41
  42 #ifdef DEBUG
  43 #define DBG(fmt...) printk(fmt)
  44 #else
  45 #define DBG(fmt...)
  46 #endif
  47
  48 static struct mpic *mpics;
  49 static struct mpic *mpic_primary;
  50 static DEFINE_RAW_SPINLOCK(mpic_lock);
  51
  52 #ifdef CONFIG_PPC32     /* XXX for now */
  53 #ifdef CONFIG_IRQ_ALL_CPUS
  54 #define distribute_irqs (1)
  55 #else
  56 #define distribute_irqs (0)
  57 #endif
  58 #endif
  59
  60 #ifdef CONFIG_MPIC_WEIRD
  61 static u32 mpic_infos[][MPIC_IDX_END] = {
  62         [0] = { /* Original OpenPIC compatible MPIC */
  63                 MPIC_GREG_BASE,
  64                 MPIC_GREG_FEATURE_0,
  65                 MPIC_GREG_GLOBAL_CONF_0,
  66                 MPIC_GREG_VENDOR_ID,
  67                 MPIC_GREG_IPI_VECTOR_PRI_0,
  68                 MPIC_GREG_IPI_STRIDE,
  69                 MPIC_GREG_SPURIOUS,
  70                 MPIC_GREG_TIMER_FREQ,
  71
  72                 MPIC_TIMER_BASE,
  73                 MPIC_TIMER_STRIDE,
  74                 MPIC_TIMER_CURRENT_CNT,
  75                 MPIC_TIMER_BASE_CNT,
  76                 MPIC_TIMER_VECTOR_PRI,
  77                 MPIC_TIMER_DESTINATION,
  78
  79                 MPIC_CPU_BASE,
  80                 MPIC_CPU_STRIDE,
  81                 MPIC_CPU_IPI_DISPATCH_0,
  82                 MPIC_CPU_IPI_DISPATCH_STRIDE,
  83                 MPIC_CPU_CURRENT_TASK_PRI,
  84                 MPIC_CPU_WHOAMI,
  85                 MPIC_CPU_INTACK,
  86                 MPIC_CPU_EOI,
  87                 MPIC_CPU_MCACK,
  88
  89                 MPIC_IRQ_BASE,
  90                 MPIC_IRQ_STRIDE,
  91                 MPIC_IRQ_VECTOR_PRI,
  92                 MPIC_VECPRI_VECTOR_MASK,
  93                 MPIC_VECPRI_POLARITY_POSITIVE,
  94                 MPIC_VECPRI_POLARITY_NEGATIVE,
  95                 MPIC_VECPRI_SENSE_LEVEL,
  96                 MPIC_VECPRI_SENSE_EDGE,
  97                 MPIC_VECPRI_POLARITY_MASK,
  98                 MPIC_VECPRI_SENSE_MASK,
  99                 MPIC_IRQ_DESTINATION
 100         },
 101         [1] = { /* Tsi108/109 PIC */
 102                 TSI108_GREG_BASE,
 103                 TSI108_GREG_FEATURE_0,
 104                 TSI108_GREG_GLOBAL_CONF_0,
 105                 TSI108_GREG_VENDOR_ID,
 106                 TSI108_GREG_IPI_VECTOR_PRI_0,
 107                 TSI108_GREG_IPI_STRIDE,
 108                 TSI108_GREG_SPURIOUS,
 109                 TSI108_GREG_TIMER_FREQ,
 110
 111                 TSI108_TIMER_BASE,
 112                 TSI108_TIMER_STRIDE,
 113                 TSI108_TIMER_CURRENT_CNT,
 114                 TSI108_TIMER_BASE_CNT,
 115                 TSI108_TIMER_VECTOR_PRI,
 116                 TSI108_TIMER_DESTINATION,
 117
 118                 TSI108_CPU_BASE,
 119                 TSI108_CPU_STRIDE,
 120                 TSI108_CPU_IPI_DISPATCH_0,
 121                 TSI108_CPU_IPI_DISPATCH_STRIDE,
 122                 TSI108_CPU_CURRENT_TASK_PRI,
 123                 TSI108_CPU_WHOAMI,
 124                 TSI108_CPU_INTACK,
 125                 TSI108_CPU_EOI,
 126                 TSI108_CPU_MCACK,
 127
 128                 TSI108_IRQ_BASE,
 129                 TSI108_IRQ_STRIDE,
 130                 TSI108_IRQ_VECTOR_PRI,
 131                 TSI108_VECPRI_VECTOR_MASK,
 132                 TSI108_VECPRI_POLARITY_POSITIVE,
 133                 TSI108_VECPRI_POLARITY_NEGATIVE,
 134                 TSI108_VECPRI_SENSE_LEVEL,
 135                 TSI108_VECPRI_SENSE_EDGE,
 136                 TSI108_VECPRI_POLARITY_MASK,
 137                 TSI108_VECPRI_SENSE_MASK,
 138                 TSI108_IRQ_DESTINATION
 139         },
 140 };
 141
 142 #define MPIC_INFO(name) mpic->hw_set[MPIC_IDX_##name]
 143
 144 #else /* CONFIG_MPIC_WEIRD */
 145
 146 #define MPIC_INFO(name) MPIC_##name
 147
 148 #endif /* CONFIG_MPIC_WEIRD */
 149
 150 /*
 151  * Register accessor functions
 152  */
 153
 154
 155 static inline u32 _mpic_read(enum mpic_reg_type type,
 156                              struct mpic_reg_bank *rb,
 157                              unsigned int reg)
 158 {
 159         switch(type) {
 160 #ifdef CONFIG_PPC_DCR
 161         case mpic_access_dcr:
 162                 return dcr_read(rb->dhost, reg);
 163 #endif
 164         case mpic_access_mmio_be:
 165                 return in_be32(rb->base + (reg >> 2));
 166         case mpic_access_mmio_le:
 167         default:
 168                 return in_le32(rb->base + (reg >> 2));
 169         }
 170 }
 171
 172 static inline void _mpic_write(enum mpic_reg_type type,
 173                                struct mpic_reg_bank *rb,
 174                                unsigned int reg, u32 value)
 175 {
 176         switch(type) {
 177 #ifdef CONFIG_PPC_DCR
 178         case mpic_access_dcr:
 179                 dcr_write(rb->dhost, reg, value);
 180                 break;
 181 #endif
 182         case mpic_access_mmio_be:
 183                 out_be32(rb->base + (reg >> 2), value);
 184                 break;
 185         case mpic_access_mmio_le:
 186         default:
 187                 out_le32(rb->base + (reg >> 2), value);
 188                 break;
 189         }
 190 }
 191
 192 static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi)
 193 {
 194         enum mpic_reg_type type = mpic->reg_type;
 195         unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
 196                               (ipi * MPIC_INFO(GREG_IPI_STRIDE));
 197
 198         if ((mpic->flags & MPIC_BROKEN_IPI) && type == mpic_access_mmio_le)
 199                 type = mpic_access_mmio_be;
 200         return _mpic_read(type, &mpic->gregs, offset);
 201 }
 202
 203 static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value)
 204 {
 205         unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
 206                               (ipi * MPIC_INFO(GREG_IPI_STRIDE));
 207
 208         _mpic_write(mpic->reg_type, &mpic->gregs, offset, value);
 209 }
 210
 211 static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
 212 {
 213         unsigned int cpu = 0;
 214
 215         if (mpic->flags & MPIC_PRIMARY)
 216                 cpu = hard_smp_processor_id();
 217         return _mpic_read(mpic->reg_type, &mpic->cpuregs[cpu], reg);
 218 }
 219
 220 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
 221 {
 222         unsigned int cpu = 0;
 223
 224         if (mpic->flags & MPIC_PRIMARY)
 225                 cpu = hard_smp_processor_id();
 226
 227         _mpic_write(mpic->reg_type, &mpic->cpuregs[cpu], reg, value);
 228 }
 229
 230 static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg)
 231 {
 232         unsigned int    isu = src_no >> mpic->isu_shift;
 233         unsigned int    idx = src_no & mpic->isu_mask;
 234         unsigned int    val;
 235
 236         val = _mpic_read(mpic->reg_type, &mpic->isus[isu],
 237                          reg + (idx * MPIC_INFO(IRQ_STRIDE)));
 238 #ifdef CONFIG_MPIC_BROKEN_REGREAD
 239         if (reg == 0)
 240                 val = (val & (MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY)) |
 241                         mpic->isu_reg0_shadow[src_no];
 242 #endif
 243         return val;
 244 }
 245
 246 static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no,
 247                                    unsigned int reg, u32 value)
 248 {
 249         unsigned int    isu = src_no >> mpic->isu_shift;
 250         unsigned int    idx = src_no & mpic->isu_mask;
 251
 252         _mpic_write(mpic->reg_type, &mpic->isus[isu],
 253                     reg + (idx * MPIC_INFO(IRQ_STRIDE)), value);
 254
 255 #ifdef CONFIG_MPIC_BROKEN_REGREAD
 256         if (reg == 0)
 257                 mpic->isu_reg0_shadow[src_no] =
 258                         value & ~(MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY);
 259 #endif
 260 }
 261
 262 #define mpic_read(b,r)          _mpic_read(mpic->reg_type,&(b),(r))
 263 #define mpic_write(b,r,v)       _mpic_write(mpic->reg_type,&(b),(r),(v))
 264 #define mpic_ipi_read(i)        _mpic_ipi_read(mpic,(i))
 265 #define mpic_ipi_write(i,v)     _mpic_ipi_write(mpic,(i),(v))
 266 #define mpic_cpu_read(i)        _mpic_cpu_read(mpic,(i))
 267 #define mpic_cpu_write(i,v)     _mpic_cpu_write(mpic,(i),(v))
 268 #define mpic_irq_read(s,r)      _mpic_irq_read(mpic,(s),(r))
 269 #define mpic_irq_write(s,r,v)   _mpic_irq_write(mpic,(s),(r),(v))
 270
 271
 272 /*
 273  * Low level utility functions
 274  */
 275
 276
 277 static void _mpic_map_mmio(struct mpic *mpic, phys_addr_t phys_addr,
 278                            struct mpic_reg_bank *rb, unsigned int offset,
 279                            unsigned int size)
 280 {
 281         rb->base = ioremap(phys_addr + offset, size);
 282         BUG_ON(rb->base == NULL);
 283 }
 284
 285 #ifdef CONFIG_PPC_DCR
 286 static void _mpic_map_dcr(struct mpic *mpic, struct device_node *node,
 287                           struct mpic_reg_bank *rb,
 288                           unsigned int offset, unsigned int size)
 289 {
 290         const u32 *dbasep;
 291
 292         dbasep = of_get_property(node, "dcr-reg", NULL);
 293
 294         rb->dhost = dcr_map(node, *dbasep + offset, size);
 295         BUG_ON(!DCR_MAP_OK(rb->dhost));
 296 }
 297
 298 static inline void mpic_map(struct mpic *mpic, struct device_node *node,
 299                             phys_addr_t phys_addr, struct mpic_reg_bank *rb,
 300                             unsigned int offset, unsigned int size)
 301 {
 302         if (mpic->flags & MPIC_USES_DCR)
 303                 _mpic_map_dcr(mpic, node, rb, offset, size);
 304         else
 305                 _mpic_map_mmio(mpic, phys_addr, rb, offset, size);
 306 }
 307 #else /* CONFIG_PPC_DCR */
 308 #define mpic_map(m,n,p,b,o,s)   _mpic_map_mmio(m,p,b,o,s)
 309 #endif /* !CONFIG_PPC_DCR */
 310
 311
 312
 313 /* Check if we have one of those nice broken MPICs with a flipped endian on
 314  * reads from IPI registers
 315  */
 316 static void __init mpic_test_broken_ipi(struct mpic *mpic)
 317 {
 318         u32 r;
 319
 320         mpic_write(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0), MPIC_VECPRI_MASK);
 321         r = mpic_read(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0));
 322
 323         if (r == le32_to_cpu(MPIC_VECPRI_MASK)) {
 324                 printk(KERN_INFO "mpic: Detected reversed IPI registers\n");
 325                 mpic->flags |= MPIC_BROKEN_IPI;
 326         }
 327 }
 328
 329 #ifdef CONFIG_MPIC_U3_HT_IRQS
 330
 331 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
 332  * to force the edge setting on the MPIC and do the ack workaround.
 333  */
 334 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
 335 {
 336         if (source >= 128 || !mpic->fixups)
 337                 return 0;
 338         return mpic->fixups[source].base != NULL;
 339 }
 340
 341
 342 static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source)
 343 {
 344         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
 345
 346         if (fixup->applebase) {
 347                 unsigned int soff = (fixup->index >> 3) & ~3;
 348                 unsigned int mask = 1U << (fixup->index & 0x1f);
 349                 writel(mask, fixup->applebase + soff);
 350         } else {
 351                 raw_spin_lock(&mpic->fixup_lock);
 352                 writeb(0x11 + 2 * fixup->index, fixup->base + 2);
 353                 writel(fixup->data, fixup->base + 4);
 354                 raw_spin_unlock(&mpic->fixup_lock);
 355         }
 356 }
 357
 358 static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source,
 359                                       unsigned int irqflags)
 360 {
 361         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
 362         unsigned long flags;
 363         u32 tmp;
 364
 365         if (fixup->base == NULL)
 366                 return;
 367
 368         DBG("startup_ht_interrupt(0x%x, 0x%x) index: %d\n",
 369             source, irqflags, fixup->index);
 370         raw_spin_lock_irqsave(&mpic->fixup_lock, flags);
 371         /* Enable and configure */
 372         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
 373         tmp = readl(fixup->base + 4);
 374         tmp &= ~(0x23U);
 375         if (irqflags & IRQ_LEVEL)
 376                 tmp |= 0x22;
 377         writel(tmp, fixup->base + 4);
 378         raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags);
 379
 380 #ifdef CONFIG_PM
 381         /* use the lowest bit inverted to the actual HW,
 382          * set if this fixup was enabled, clear otherwise */
 383         mpic->save_data[source].fixup_data = tmp | 1;
 384 #endif
 385 }
 386
 387 static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source,
 388                                        unsigned int irqflags)
 389 {
 390         struct mpic_irq_fixup *fixup = &mpic->fixups[source];
 391         unsigned long flags;
 392         u32 tmp;
 393
 394         if (fixup->base == NULL)
 395                 return;
 396
 397         DBG("shutdown_ht_interrupt(0x%x, 0x%x)\n", source, irqflags);
 398
 399         /* Disable */
 400         raw_spin_lock_irqsave(&mpic->fixup_lock, flags);
 401         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
 402         tmp = readl(fixup->base + 4);
 403         tmp |= 1;
 404         writel(tmp, fixup->base + 4);
 405         raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags);
 406
 407 #ifdef CONFIG_PM
 408         /* use the lowest bit inverted to the actual HW,
 409          * set if this fixup was enabled, clear otherwise */
 410         mpic->save_data[source].fixup_data = tmp & ~1;
 411 #endif
 412 }
 413
 414 #ifdef CONFIG_PCI_MSI
 415 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
 416                                     unsigned int devfn)
 417 {
 418         u8 __iomem *base;
 419         u8 pos, flags;
 420         u64 addr = 0;
 421
 422         for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
 423              pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
 424                 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
 425                 if (id == PCI_CAP_ID_HT) {
 426                         id = readb(devbase + pos + 3);
 427                         if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_MSI_MAPPING)
 428                                 break;
 429                 }
 430         }
 431
 432         if (pos == 0)
 433                 return;
 434
 435         base = devbase + pos;
 436
 437         flags = readb(base + HT_MSI_FLAGS);
 438         if (!(flags & HT_MSI_FLAGS_FIXED)) {
 439                 addr = readl(base + HT_MSI_ADDR_LO) & HT_MSI_ADDR_LO_MASK;
 440                 addr = addr | ((u64)readl(base + HT_MSI_ADDR_HI) << 32);
 441         }
 442
 443         printk(KERN_DEBUG "mpic:   - HT:%02x.%x %s MSI mapping found @ 0x%llx\n",
 444                 PCI_SLOT(devfn), PCI_FUNC(devfn),
 445                 flags & HT_MSI_FLAGS_ENABLE ? "enabled" : "disabled", addr);
 446
 447         if (!(flags & HT_MSI_FLAGS_ENABLE))
 448                 writeb(flags | HT_MSI_FLAGS_ENABLE, base + HT_MSI_FLAGS);
 449 }
 450 #else
 451 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
 452                                     unsigned int devfn)
 453 {
 454         return;
 455 }
 456 #endif
 457
 458 static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
 459                                     unsigned int devfn, u32 vdid)
 460 {
 461         int i, irq, n;
 462         u8 __iomem *base;
 463         u32 tmp;
 464         u8 pos;
 465
 466         for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
 467              pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
 468                 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
 469                 if (id == PCI_CAP_ID_HT) {
 470                         id = readb(devbase + pos + 3);
 471                         if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_IRQ)
 472                                 break;
 473                 }
 474         }
 475         if (pos == 0)
 476                 return;
 477
 478         base = devbase + pos;
 479         writeb(0x01, base + 2);
 480         n = (readl(base + 4) >> 16) & 0xff;
 481
 482         printk(KERN_INFO "mpic:   - HT:%02x.%x [0x%02x] vendor %04x device %04x"
 483                " has %d irqs\n",
 484                devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1);
 485
 486         for (i = 0; i <= n; i++) {
 487                 writeb(0x10 + 2 * i, base + 2);
 488                 tmp = readl(base + 4);
 489                 irq = (tmp >> 16) & 0xff;
 490                 DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp);
 491                 /* mask it , will be unmasked later */
 492                 tmp |= 0x1;
 493                 writel(tmp, base + 4);
 494                 mpic->fixups[irq].index = i;
 495                 mpic->fixups[irq].base = base;
 496                 /* Apple HT PIC has a non-standard way of doing EOIs */
 497                 if ((vdid & 0xffff) == 0x106b)
 498                         mpic->fixups[irq].applebase = devbase + 0x60;
 499                 else
 500                         mpic->fixups[irq].applebase = NULL;
 501                 writeb(0x11 + 2 * i, base + 2);
 502                 mpic->fixups[irq].data = readl(base + 4) | 0x80000000;
 503         }
 504 }
 505
 506
 507 static void __init mpic_scan_ht_pics(struct mpic *mpic)
 508 {
 509         unsigned int devfn;
 510         u8 __iomem *cfgspace;
 511
 512         printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n");
 513
 514         /* Allocate fixups array */
 515         mpic->fixups = kzalloc(128 * sizeof(*mpic->fixups), GFP_KERNEL);
 516         BUG_ON(mpic->fixups == NULL);
 517
 518         /* Init spinlock */
 519         raw_spin_lock_init(&mpic->fixup_lock);
 520
 521         /* Map U3 config space. We assume all IO-APICs are on the primary bus
 522          * so we only need to map 64kB.
 523          */
 524         cfgspace = ioremap(0xf2000000, 0x10000);
 525         BUG_ON(cfgspace == NULL);
 526
 527         /* Now we scan all slots. We do a very quick scan, we read the header
 528          * type, vendor ID and device ID only, that's plenty enough
 529          */
 530         for (devfn = 0; devfn < 0x100; devfn++) {
 531                 u8 __iomem *devbase = cfgspace + (devfn << 8);
 532                 u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
 533                 u32 l = readl(devbase + PCI_VENDOR_ID);
 534                 u16 s;
 535
 536                 DBG("devfn %x, l: %x\n", devfn, l);
 537
 538                 /* If no device, skip */
 539                 if (l == 0xffffffff || l == 0x00000000 ||
 540                     l == 0x0000ffff || l == 0xffff0000)
 541                         goto next;
 542                 /* Check if is supports capability lists */
 543                 s = readw(devbase + PCI_STATUS);
 544                 if (!(s & PCI_STATUS_CAP_LIST))
 545                         goto next;
 546
 547                 mpic_scan_ht_pic(mpic, devbase, devfn, l);
 548                 mpic_scan_ht_msi(mpic, devbase, devfn);
 549
 550         next:
 551                 /* next device, if function 0 */
 552                 if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0)
 553                         devfn += 7;
 554         }
 555 }
 556
 557 #else /* CONFIG_MPIC_U3_HT_IRQS */
 558
 559 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
 560 {
 561         return 0;
 562 }
 563
 564 static void __init mpic_scan_ht_pics(struct mpic *mpic)
 565 {
 566 }
 567
 568 #endif /* CONFIG_MPIC_U3_HT_IRQS */
 569
 570 #ifdef CONFIG_SMP
 571 static int irq_choose_cpu(const struct cpumask *mask)
 572 {
 573         int cpuid;
 574
 575         if (cpumask_equal(mask, cpu_all_mask)) {
 576                 static int irq_rover = 0;
 577                 static DEFINE_RAW_SPINLOCK(irq_rover_lock);
 578                 unsigned long flags;
 579
 580                 /* Round-robin distribution... */
 581         do_round_robin:
 582                 raw_spin_lock_irqsave(&irq_rover_lock, flags);
 583
 584                 irq_rover = cpumask_next(irq_rover, cpu_online_mask);
 585                 if (irq_rover >= nr_cpu_ids)
 586                         irq_rover = cpumask_first(cpu_online_mask);
 587
 588                 cpuid = irq_rover;
 589
 590                 raw_spin_unlock_irqrestore(&irq_rover_lock, flags);
 591         } else {
 592                 cpuid = cpumask_first_and(mask, cpu_online_mask);
 593                 if (cpuid >= nr_cpu_ids)
 594                         goto do_round_robin;
 595         }
 596
 597         return get_hard_smp_processor_id(cpuid);
 598 }
 599 #else
 600 static int irq_choose_cpu(const struct cpumask *mask)
 601 {
 602         return hard_smp_processor_id();
 603 }
 604 #endif
 605
 606 #define mpic_irq_to_hw(virq)    ((unsigned int)irq_map[virq].hwirq)
 607
 608 /* Find an mpic associated with a given linux interrupt */
 609 static struct mpic *mpic_find(unsigned int irq)
 610 {
 611         if (irq < NUM_ISA_INTERRUPTS)
 612                 return NULL;
 613
 614         return irq_to_desc(irq)->chip_data;
 615 }
 616
 617 /* Determine if the linux irq is an IPI */
 618 static unsigned int mpic_is_ipi(struct mpic *mpic, unsigned int irq)
 619 {
 620         unsigned int src = mpic_irq_to_hw(irq);
 621
 622         return (src >= mpic->ipi_vecs[0] && src <= mpic->ipi_vecs[3]);
 623 }
 624
 625
 626 /* Convert a cpu mask from logical to physical cpu numbers. */
 627 static inline u32 mpic_physmask(u32 cpumask)
 628 {
 629         int i;
 630         u32 mask = 0;
 631
 632         for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1)
 633                 mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
 634         return mask;
 635 }
 636
 637 #ifdef CONFIG_SMP
 638 /* Get the mpic structure from the IPI number */
 639 static inline struct mpic * mpic_from_ipi(unsigned int ipi)
 640 {
 641         return irq_to_desc(ipi)->chip_data;
 642 }
 643 #endif
 644
 645 /* Get the mpic structure from the irq number */
 646 static inline struct mpic * mpic_from_irq(unsigned int irq)
 647 {
 648         return irq_to_desc(irq)->chip_data;
 649 }
 650
 651 /* Send an EOI */
 652 static inline void mpic_eoi(struct mpic *mpic)
 653 {
 654         mpic_cpu_write(MPIC_INFO(CPU_EOI), 0);
 655         (void)mpic_cpu_read(MPIC_INFO(CPU_WHOAMI));
 656 }
 657
 658 /*
 659  * Linux descriptor level callbacks
 660  */
 661
 662
 663 void mpic_unmask_irq(unsigned int irq)
 664 {
 665         unsigned int loops = 100000;
 666         struct mpic *mpic = mpic_from_irq(irq);
 667         unsigned int src = mpic_irq_to_hw(irq);
 668
 669         DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, irq, src);
 670
 671         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
 672                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) &
 673                        ~MPIC_VECPRI_MASK);
 674         /* make sure mask gets to controller before we return to user */
 675         do {
 676                 if (!loops--) {
 677                         printk(KERN_ERR "%s: timeout on hwirq %u\n",
 678                                __func__, src);
 679                         break;
 680                 }
 681         } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK);
 682 }
 683
 684 void mpic_mask_irq(unsigned int irq)
 685 {
 686         unsigned int loops = 100000;
 687         struct mpic *mpic = mpic_from_irq(irq);
 688         unsigned int src = mpic_irq_to_hw(irq);
 689
 690         DBG("%s: disable_irq: %d (src %d)\n", mpic->name, irq, src);
 691
 692         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
 693                        mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) |
 694                        MPIC_VECPRI_MASK);
 695
 696         /* make sure mask gets to controller before we return to user */
 697         do {
 698                 if (!loops--) {
 699                         printk(KERN_ERR "%s: timeout on hwirq %u\n",
 700                                __func__, src);
 701                         break;
 702                 }
 703         } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK));
 704 }
 705
 706 void mpic_end_irq(unsigned int irq)
 707 {
 708         struct mpic *mpic = mpic_from_irq(irq);
 709
 710 #ifdef DEBUG_IRQ
 711         DBG("%s: end_irq: %d\n", mpic->name, irq);
 712 #endif
 713         /* We always EOI on end_irq() even for edge interrupts since that
 714          * should only lower the priority, the MPIC should have properly
 715          * latched another edge interrupt coming in anyway
 716          */
 717
 718         mpic_eoi(mpic);
 719 }
 720
 721 #ifdef CONFIG_MPIC_U3_HT_IRQS
 722
 723 static void mpic_unmask_ht_irq(unsigned int irq)
 724 {
 725         struct mpic *mpic = mpic_from_irq(irq);
 726         unsigned int src = mpic_irq_to_hw(irq);
 727
 728         mpic_unmask_irq(irq);
 729
 730         if (irq_to_desc(irq)->status & IRQ_LEVEL)
 731                 mpic_ht_end_irq(mpic, src);
 732 }
 733
 734 static unsigned int mpic_startup_ht_irq(unsigned int irq)
 735 {
 736         struct mpic *mpic = mpic_from_irq(irq);
 737         unsigned int src = mpic_irq_to_hw(irq);
 738
 739         mpic_unmask_irq(irq);
 740         mpic_startup_ht_interrupt(mpic, src, irq_to_desc(irq)->status);
 741
 742         return 0;
 743 }
 744
 745 static void mpic_shutdown_ht_irq(unsigned int irq)
 746 {
 747         struct mpic *mpic = mpic_from_irq(irq);
 748         unsigned int src = mpic_irq_to_hw(irq);
 749
 750         mpic_shutdown_ht_interrupt(mpic, src, irq_to_desc(irq)->status);
 751         mpic_mask_irq(irq);
 752 }
 753
 754 static void mpic_end_ht_irq(unsigned int irq)
 755 {
 756         struct mpic *mpic = mpic_from_irq(irq);
 757         unsigned int src = mpic_irq_to_hw(irq);
 758
 759 #ifdef DEBUG_IRQ
 760         DBG("%s: end_irq: %d\n", mpic->name, irq);
 761 #endif
 762         /* We always EOI on end_irq() even for edge interrupts since that
 763          * should only lower the priority, the MPIC should have properly
 764          * latched another edge interrupt coming in anyway
 765          */
 766
 767         if (irq_to_desc(irq)->status & IRQ_LEVEL)
 768                 mpic_ht_end_irq(mpic, src);
 769         mpic_eoi(mpic);
 770 }
 771 #endif /* !CONFIG_MPIC_U3_HT_IRQS */
 772
 773 #ifdef CONFIG_SMP
 774
 775 static void mpic_unmask_ipi(unsigned int irq)
 776 {
 777         struct mpic *mpic = mpic_from_ipi(irq);
 778         unsigned int src = mpic_irq_to_hw(irq) - mpic->ipi_vecs[0];
 779
 780         DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, irq, src);
 781         mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
 782 }
 783
 784 static void mpic_mask_ipi(unsigned int irq)
 785 {
 786         /* NEVER disable an IPI... that's just plain wrong! */
 787 }
 788
 789 static void mpic_end_ipi(unsigned int irq)
 790 {
 791         struct mpic *mpic = mpic_from_ipi(irq);
 792
 793         /*
 794          * IPIs are marked IRQ_PER_CPU. This has the side effect of
 795          * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
 796          * applying to them. We EOI them late to avoid re-entering.
 797          * We mark IPI's with IRQF_DISABLED as they must run with
 798          * irqs disabled.
 799          */
 800         mpic_eoi(mpic);
 801 }
 802
 803 #endif /* CONFIG_SMP */
 804
 805 int mpic_set_affinity(unsigned int irq, const struct cpumask *cpumask)
 806 {
 807         struct mpic *mpic = mpic_from_irq(irq);
 808         unsigned int src = mpic_irq_to_hw(irq);
 809
 810         if (mpic->flags & MPIC_SINGLE_DEST_CPU) {
 811                 int cpuid = irq_choose_cpu(cpumask);
 812
 813                 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
 814         } else {
 815                 cpumask_var_t tmp;
 816
 817                 alloc_cpumask_var(&tmp, GFP_KERNEL);
 818
 819                 cpumask_and(tmp, cpumask, cpu_online_mask);
 820
 821                 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION),
 822                                mpic_physmask(cpumask_bits(tmp)[0]));
 823
 824                 free_cpumask_var(tmp);
 825         }
 826
 827         return 0;
 828 }
 829
 830 static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type)
 831 {
 832         /* Now convert sense value */
 833         switch(type & IRQ_TYPE_SENSE_MASK) {
 834         case IRQ_TYPE_EDGE_RISING:
 835                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
 836                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
 837         case IRQ_TYPE_EDGE_FALLING:
 838         case IRQ_TYPE_EDGE_BOTH:
 839                 return MPIC_INFO(VECPRI_SENSE_EDGE) |
 840                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
 841         case IRQ_TYPE_LEVEL_HIGH:
 842                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
 843                        MPIC_INFO(VECPRI_POLARITY_POSITIVE);
 844         case IRQ_TYPE_LEVEL_LOW:
 845         default:
 846                 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
 847                        MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
 848         }
 849 }
 850
 851 int mpic_set_irq_type(unsigned int virq, unsigned int flow_type)
 852 {
 853         struct mpic *mpic = mpic_from_irq(virq);
 854         unsigned int src = mpic_irq_to_hw(virq);
 855         struct irq_desc *desc = irq_to_desc(virq);
 856         unsigned int vecpri, vold, vnew;
 857
 858         DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n",
 859             mpic, virq, src, flow_type);
 860
 861         if (src >= mpic->irq_count)
 862                 return -EINVAL;
 863
 864         if (flow_type == IRQ_TYPE_NONE)
 865                 if (mpic->senses && src < mpic->senses_count)
 866                         flow_type = mpic->senses[src];
 867         if (flow_type == IRQ_TYPE_NONE)
 868                 flow_type = IRQ_TYPE_LEVEL_LOW;
 869
 870         desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
 871         desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
 872         if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
 873                 desc->status |= IRQ_LEVEL;
 874
 875         if (mpic_is_ht_interrupt(mpic, src))
 876                 vecpri = MPIC_VECPRI_POLARITY_POSITIVE |
 877                         MPIC_VECPRI_SENSE_EDGE;
 878         else
 879                 vecpri = mpic_type_to_vecpri(mpic, flow_type);
 880
 881         vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
 882         vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) |
 883                         MPIC_INFO(VECPRI_SENSE_MASK));
 884         vnew |= vecpri;
 885         if (vold != vnew)
 886                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew);
 887
 888         return 0;
 889 }
 890
 891 void mpic_set_vector(unsigned int virq, unsigned int vector)
 892 {
 893         struct mpic *mpic = mpic_from_irq(virq);
 894         unsigned int src = mpic_irq_to_hw(virq);
 895         unsigned int vecpri;
 896
 897         DBG("mpic: set_vector(mpic:@%p,virq:%d,src:%d,vector:0x%x)\n",
 898             mpic, virq, src, vector);
 899
 900         if (src >= mpic->irq_count)
 901                 return;
 902
 903         vecpri = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
 904         vecpri = vecpri & ~MPIC_INFO(VECPRI_VECTOR_MASK);
 905         vecpri |= vector;
 906         mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
 907 }
 908
 909 static struct irq_chip mpic_irq_chip = {
 910         .mask           = mpic_mask_irq,
 911         .unmask         = mpic_unmask_irq,
 912         .eoi            = mpic_end_irq,
 913         .set_type       = mpic_set_irq_type,
 914 };
 915
 916 #ifdef CONFIG_SMP
 917 static struct irq_chip mpic_ipi_chip = {
 918         .mask           = mpic_mask_ipi,
 919         .unmask         = mpic_unmask_ipi,
 920         .eoi            = mpic_end_ipi,
 921 };
 922 #endif /* CONFIG_SMP */
 923
 924 #ifdef CONFIG_MPIC_U3_HT_IRQS
 925 static struct irq_chip mpic_irq_ht_chip = {
 926         .startup        = mpic_startup_ht_irq,
 927         .shutdown       = mpic_shutdown_ht_irq,
 928         .mask           = mpic_mask_irq,
 929         .unmask         = mpic_unmask_ht_irq,
 930         .eoi            = mpic_end_ht_irq,
 931         .set_type       = mpic_set_irq_type,
 932 };
 933 #endif /* CONFIG_MPIC_U3_HT_IRQS */
 934
 935
 936 static int mpic_host_match(struct irq_host *h, struct device_node *node)
 937 {
 938         /* Exact match, unless mpic node is NULL */
 939         return h->of_node == NULL || h->of_node == node;
 940 }
 941
 942 static int mpic_host_map(struct irq_host *h, unsigned int virq,
 943                          irq_hw_number_t hw)
 944 {
 945         struct mpic *mpic = h->host_data;
 946         struct irq_chip *chip;
 947
 948         DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw);
 949
 950         if (hw == mpic->spurious_vec)
 951                 return -EINVAL;
 952         if (mpic->protected && test_bit(hw, mpic->protected))
 953                 return -EINVAL;
 954
 955 #ifdef CONFIG_SMP
 956         else if (hw >= mpic->ipi_vecs[0]) {
 957                 WARN_ON(!(mpic->flags & MPIC_PRIMARY));
 958
 959                 DBG("mpic: mapping as IPI\n");
 960                 set_irq_chip_data(virq, mpic);
 961                 set_irq_chip_and_handler(virq, &mpic->hc_ipi,
 962                                          handle_percpu_irq);
 963                 return 0;
 964         }
 965 #endif /* CONFIG_SMP */
 966
 967         if (hw >= mpic->irq_count)
 968                 return -EINVAL;
 969
 970         mpic_msi_reserve_hwirq(mpic, hw);
 971
 972         /* Default chip */
 973         chip = &mpic->hc_irq;
 974
 975 #ifdef CONFIG_MPIC_U3_HT_IRQS
 976         /* Check for HT interrupts, override vecpri */
 977         if (mpic_is_ht_interrupt(mpic, hw))
 978                 chip = &mpic->hc_ht_irq;
 979 #endif /* CONFIG_MPIC_U3_HT_IRQS */
 980
 981         DBG("mpic: mapping to irq chip @%p\n", chip);
 982
 983         set_irq_chip_data(virq, mpic);
 984         set_irq_chip_and_handler(virq, chip, handle_fasteoi_irq);
 985
 986         /* Set default irq type */
 987         set_irq_type(virq, IRQ_TYPE_NONE);
 988
 989         return 0;
 990 }
 991
 992 static int mpic_host_xlate(struct irq_host *h, struct device_node *ct,
 993                            const u32 *intspec, unsigned int intsize,
 994                            irq_hw_number_t *out_hwirq, unsigned int *out_flags)
 995
 996 {
 997         static unsigned char map_mpic_senses[4] = {
 998                 IRQ_TYPE_EDGE_RISING,
 999                 IRQ_TYPE_LEVEL_LOW,
1000                 IRQ_TYPE_LEVEL_HIGH,
1001                 IRQ_TYPE_EDGE_FALLING,
1002         };
1003
1004         *out_hwirq = intspec[0];
1005         if (intsize > 1) {
1006                 u32 mask = 0x3;
1007
1008                 /* Apple invented a new race of encoding on machines with
1009                  * an HT APIC. They encode, among others, the index within
1010                  * the HT APIC. We don't care about it here since thankfully,
1011                  * it appears that they have the APIC already properly
1012                  * configured, and thus our current fixup code that reads the
1013                  * APIC config works fine. However, we still need to mask out
1014                  * bits in the specifier to make sure we only get bit 0 which
1015                  * is the level/edge bit (the only sense bit exposed by Apple),
1016                  * as their bit 1 means something else.
1017                  */
1018                 if (machine_is(powermac))
1019                         mask = 0x1;
1020                 *out_flags = map_mpic_senses[intspec[1] & mask];
1021         } else
1022                 *out_flags = IRQ_TYPE_NONE;
1023
1024         DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
1025             intsize, intspec[0], intspec[1], *out_hwirq, *out_flags);
1026
1027         return 0;
1028 }
1029
1030 static struct irq_host_ops mpic_host_ops = {
1031         .match = mpic_host_match,
1032         .map = mpic_host_map,
1033         .xlate = mpic_host_xlate,
1034 };
1035
1036 /*
1037  * Exported functions
1038  */
1039
1040 struct mpic * __init mpic_alloc(struct device_node *node,
1041                                 phys_addr_t phys_addr,
1042                                 unsigned int flags,
1043                                 unsigned int isu_size,
1044                                 unsigned int irq_count,
1045                                 const char *name)
1046 {
1047         struct mpic     *mpic;
1048         u32             greg_feature;
1049         const char      *vers;
1050         int             i;
1051         int             intvec_top;
1052         u64             paddr = phys_addr;
1053
1054         mpic = kzalloc(sizeof(struct mpic), GFP_KERNEL);
1055         if (mpic == NULL)
1056                 return NULL;
1057
1058         mpic->name = name;
1059
1060         mpic->hc_irq = mpic_irq_chip;
1061         mpic->hc_irq.name = name;
1062         if (flags & MPIC_PRIMARY)
1063                 mpic->hc_irq.set_affinity = mpic_set_affinity;
1064 #ifdef CONFIG_MPIC_U3_HT_IRQS
1065         mpic->hc_ht_irq = mpic_irq_ht_chip;
1066         mpic->hc_ht_irq.name = name;
1067         if (flags & MPIC_PRIMARY)
1068                 mpic->hc_ht_irq.set_affinity = mpic_set_affinity;
1069 #endif /* CONFIG_MPIC_U3_HT_IRQS */
1070
1071 #ifdef CONFIG_SMP
1072         mpic->hc_ipi = mpic_ipi_chip;
1073         mpic->hc_ipi.name = name;
1074 #endif /* CONFIG_SMP */
1075
1076         mpic->flags = flags;
1077         mpic->isu_size = isu_size;
1078         mpic->irq_count = irq_count;
1079         mpic->num_sources = 0; /* so far */
1080
1081         if (flags & MPIC_LARGE_VECTORS)
1082                 intvec_top = 2047;
1083         else
1084                 intvec_top = 255;
1085
1086         mpic->timer_vecs[0] = intvec_top - 8;
1087         mpic->timer_vecs[1] = intvec_top - 7;
1088         mpic->timer_vecs[2] = intvec_top - 6;
1089         mpic->timer_vecs[3] = intvec_top - 5;
1090         mpic->ipi_vecs[0]   = intvec_top - 4;
1091         mpic->ipi_vecs[1]   = intvec_top - 3;
1092         mpic->ipi_vecs[2]   = intvec_top - 2;
1093         mpic->ipi_vecs[3]   = intvec_top - 1;
1094         mpic->spurious_vec  = intvec_top;
1095
1096         /* Check for "big-endian" in device-tree */
1097         if (node && of_get_property(node, "big-endian", NULL) != NULL)
1098                 mpic->flags |= MPIC_BIG_ENDIAN;
1099
1100         /* Look for protected sources */
1101         if (node) {
1102                 int psize;
1103                 unsigned int bits, mapsize;
1104                 const u32 *psrc =
1105                         of_get_property(node, "protected-sources", &psize);
1106                 if (psrc) {
1107                         psize /= 4;
1108                         bits = intvec_top + 1;
1109                         mapsize = BITS_TO_LONGS(bits) * sizeof(unsigned long);
1110                         mpic->protected = kzalloc(mapsize, GFP_KERNEL);
1111                         BUG_ON(mpic->protected == NULL);
1112                         for (i = 0; i < psize; i++) {
1113                                 if (psrc[i] > intvec_top)
1114                                         continue;
1115                                 __set_bit(psrc[i], mpic->protected);
1116                         }
1117                 }
1118         }
1119
1120 #ifdef CONFIG_MPIC_WEIRD
1121         mpic->hw_set = mpic_infos[MPIC_GET_REGSET(flags)];
1122 #endif
1123
1124         /* default register type */
1125         mpic->reg_type = (flags & MPIC_BIG_ENDIAN) ?
1126                 mpic_access_mmio_be : mpic_access_mmio_le;
1127
1128         /* If no physical address is passed in, a device-node is mandatory */
1129         BUG_ON(paddr == 0 && node == NULL);
1130
1131         /* If no physical address passed in, check if it's dcr based */
1132         if (paddr == 0 && of_get_property(node, "dcr-reg", NULL) != NULL) {
1133 #ifdef CONFIG_PPC_DCR
1134                 mpic->flags |= MPIC_USES_DCR;
1135                 mpic->reg_type = mpic_access_dcr;
1136 #else
1137                 BUG();
1138 #endif /* CONFIG_PPC_DCR */
1139         }
1140
1141         /* If the MPIC is not DCR based, and no physical address was passed
1142          * in, try to obtain one
1143          */
1144         if (paddr == 0 && !(mpic->flags & MPIC_USES_DCR)) {
1145                 const u32 *reg = of_get_property(node, "reg", NULL);
1146                 BUG_ON(reg == NULL);
1147                 paddr = of_translate_address(node, reg);
1148                 BUG_ON(paddr == OF_BAD_ADDR);
1149         }
1150
1151         /* Map the global registers */
1152         mpic_map(mpic, node, paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
1153         mpic_map(mpic, node, paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
1154
1155         /* Reset */
1156         if (flags & MPIC_WANTS_RESET) {
1157                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1158                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1159                            | MPIC_GREG_GCONF_RESET);
1160                 while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1161                        & MPIC_GREG_GCONF_RESET)
1162                         mb();
1163         }
1164
1165         /* CoreInt */
1166         if (flags & MPIC_ENABLE_COREINT)
1167                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1168                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1169                            | MPIC_GREG_GCONF_COREINT);
1170
1171         if (flags & MPIC_ENABLE_MCK)
1172                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1173                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1174                            | MPIC_GREG_GCONF_MCK);
1175
1176         /* Read feature register, calculate num CPUs and, for non-ISU
1177          * MPICs, num sources as well. On ISU MPICs, sources are counted
1178          * as ISUs are added
1179          */
1180         greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
1181         mpic->num_cpus = ((greg_feature & MPIC_GREG_FEATURE_LAST_CPU_MASK)
1182                           >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
1183         if (isu_size == 0) {
1184                 if (flags & MPIC_BROKEN_FRR_NIRQS)
1185                         mpic->num_sources = mpic->irq_count;
1186                 else
1187                         mpic->num_sources =
1188                                 ((greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
1189                                  >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
1190         }
1191
1192         /* Map the per-CPU registers */
1193         for (i = 0; i < mpic->num_cpus; i++) {
1194                 mpic_map(mpic, node, paddr, &mpic->cpuregs[i],
1195                          MPIC_INFO(CPU_BASE) + i * MPIC_INFO(CPU_STRIDE),
1196                          0x1000);
1197         }
1198
1199         /* Initialize main ISU if none provided */
1200         if (mpic->isu_size == 0) {
1201                 mpic->isu_size = mpic->num_sources;
1202                 mpic_map(mpic, node, paddr, &mpic->isus[0],
1203                          MPIC_INFO(IRQ_BASE), MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1204         }
1205         mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
1206         mpic->isu_mask = (1 << mpic->isu_shift) - 1;
1207
1208         mpic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
1209                                        isu_size ? isu_size : mpic->num_sources,
1210                                        &mpic_host_ops,
1211                                        flags & MPIC_LARGE_VECTORS ? 2048 : 256);
1212         if (mpic->irqhost == NULL)
1213                 return NULL;
1214
1215         mpic->irqhost->host_data = mpic;
1216
1217         /* Display version */
1218         switch (greg_feature & MPIC_GREG_FEATURE_VERSION_MASK) {
1219         case 1:
1220                 vers = "1.0";
1221                 break;
1222         case 2:
1223                 vers = "1.2";
1224                 break;
1225         case 3:
1226                 vers = "1.3";
1227                 break;
1228         default:
1229                 vers = "<unknown>";
1230                 break;
1231         }
1232         printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx,"
1233                " max %d CPUs\n",
1234                name, vers, (unsigned long long)paddr, mpic->num_cpus);
1235         printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n",
1236                mpic->isu_size, mpic->isu_shift, mpic->isu_mask);
1237
1238         mpic->next = mpics;
1239         mpics = mpic;
1240
1241         if (flags & MPIC_PRIMARY) {
1242                 mpic_primary = mpic;
1243                 irq_set_default_host(mpic->irqhost);
1244         }
1245
1246         return mpic;
1247 }
1248
1249 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
1250                             phys_addr_t paddr)
1251 {
1252         unsigned int isu_first = isu_num * mpic->isu_size;
1253
1254         BUG_ON(isu_num >= MPIC_MAX_ISU);
1255
1256         mpic_map(mpic, mpic->irqhost->of_node,
1257                  paddr, &mpic->isus[isu_num], 0,
1258                  MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1259
1260         if ((isu_first + mpic->isu_size) > mpic->num_sources)
1261                 mpic->num_sources = isu_first + mpic->isu_size;
1262 }
1263
1264 void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count)
1265 {
1266         mpic->senses = senses;
1267         mpic->senses_count = count;
1268 }
1269
1270 void __init mpic_init(struct mpic *mpic)
1271 {
1272         int i;
1273         int cpu;
1274
1275         BUG_ON(mpic->num_sources == 0);
1276
1277         printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
1278
1279         /* Set current processor priority to max */
1280         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1281
1282         /* Initialize timers: just disable them all */
1283         for (i = 0; i < 4; i++) {
1284                 mpic_write(mpic->tmregs,
1285                            i * MPIC_INFO(TIMER_STRIDE) +
1286                            MPIC_INFO(TIMER_DESTINATION), 0);
1287                 mpic_write(mpic->tmregs,
1288                            i * MPIC_INFO(TIMER_STRIDE) +
1289                            MPIC_INFO(TIMER_VECTOR_PRI),
1290                            MPIC_VECPRI_MASK |
1291                            (mpic->timer_vecs[0] + i));
1292         }
1293
1294         /* Initialize IPIs to our reserved vectors and mark them disabled for now */
1295         mpic_test_broken_ipi(mpic);
1296         for (i = 0; i < 4; i++) {
1297                 mpic_ipi_write(i,
1298                                MPIC_VECPRI_MASK |
1299                                (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
1300                                (mpic->ipi_vecs[0] + i));
1301         }
1302
1303         /* Initialize interrupt sources */
1304         if (mpic->irq_count == 0)
1305                 mpic->irq_count = mpic->num_sources;
1306
1307         /* Do the HT PIC fixups on U3 broken mpic */
1308         DBG("MPIC flags: %x\n", mpic->flags);
1309         if ((mpic->flags & MPIC_U3_HT_IRQS) && (mpic->flags & MPIC_PRIMARY)) {
1310                 mpic_scan_ht_pics(mpic);
1311                 mpic_u3msi_init(mpic);
1312         }
1313
1314         mpic_pasemi_msi_init(mpic);
1315
1316         if (mpic->flags & MPIC_PRIMARY)
1317                 cpu = hard_smp_processor_id();
1318         else
1319                 cpu = 0;
1320
1321         for (i = 0; i < mpic->num_sources; i++) {
1322                 /* start with vector = source number, and masked */
1323                 u32 vecpri = MPIC_VECPRI_MASK | i |
1324                         (8 << MPIC_VECPRI_PRIORITY_SHIFT);
1325
1326                 /* check if protected */
1327                 if (mpic->protected && test_bit(i, mpic->protected))
1328                         continue;
1329                 /* init hw */
1330                 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
1331                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1 << cpu);
1332         }
1333
1334         /* Init spurious vector */
1335         mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), mpic->spurious_vec);
1336
1337         /* Disable 8259 passthrough, if supported */
1338         if (!(mpic->flags & MPIC_NO_PTHROU_DIS))
1339                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1340                            mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1341                            | MPIC_GREG_GCONF_8259_PTHROU_DIS);
1342
1343         if (mpic->flags & MPIC_NO_BIAS)
1344                 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1345                         mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1346                         | MPIC_GREG_GCONF_NO_BIAS);
1347
1348         /* Set current processor priority to 0 */
1349         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1350
1351 #ifdef CONFIG_PM
1352         /* allocate memory to save mpic state */
1353         mpic->save_data = kmalloc(mpic->num_sources * sizeof(*mpic->save_data),
1354                                   GFP_KERNEL);
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         raw_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         raw_spin_unlock_irqrestore(&mpic_lock, flags);
1382 }
1383
1384 void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
1385 {
1386         struct mpic *mpic = mpic_find(irq);
1387         unsigned int src = mpic_irq_to_hw(irq);
1388         unsigned long flags;
1389         u32 reg;
1390
1391         if (!mpic)
1392                 return;
1393
1394         raw_spin_lock_irqsave(&mpic_lock, flags);
1395         if (mpic_is_ipi(mpic, irq)) {
1396                 reg = mpic_ipi_read(src - mpic->ipi_vecs[0]) &
1397                         ~MPIC_VECPRI_PRIORITY_MASK;
1398                 mpic_ipi_write(src - mpic->ipi_vecs[0],
1399                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1400         } else {
1401                 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI))
1402                         & ~MPIC_VECPRI_PRIORITY_MASK;
1403                 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
1404                                reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1405         }
1406         raw_spin_unlock_irqrestore(&mpic_lock, flags);
1407 }
1408
1409 void mpic_setup_this_cpu(void)
1410 {
1411 #ifdef CONFIG_SMP
1412         struct mpic *mpic = mpic_primary;
1413         unsigned long flags;
1414         u32 msk = 1 << hard_smp_processor_id();
1415         unsigned int i;
1416
1417         BUG_ON(mpic == NULL);
1418
1419         DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1420
1421         raw_spin_lock_irqsave(&mpic_lock, flags);
1422
1423         /* let the mpic know we want intrs. default affinity is 0xffffffff
1424          * until changed via /proc. That's how it's done on x86. If we want
1425          * it differently, then we should make sure we also change the default
1426          * values of irq_desc[].affinity in irq.c.
1427          */
1428         if (distribute_irqs) {
1429                 for (i = 0; i < mpic->num_sources ; i++)
1430                         mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1431                                 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk);
1432         }
1433
1434         /* Set current processor priority to 0 */
1435         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1436
1437         raw_spin_unlock_irqrestore(&mpic_lock, flags);
1438 #endif /* CONFIG_SMP */
1439 }
1440
1441 int mpic_cpu_get_priority(void)
1442 {
1443         struct mpic *mpic = mpic_primary;
1444
1445         return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI));
1446 }
1447
1448 void mpic_cpu_set_priority(int prio)
1449 {
1450         struct mpic *mpic = mpic_primary;
1451
1452         prio &= MPIC_CPU_TASKPRI_MASK;
1453         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio);
1454 }
1455
1456 void mpic_teardown_this_cpu(int secondary)
1457 {
1458         struct mpic *mpic = mpic_primary;
1459         unsigned long flags;
1460         u32 msk = 1 << hard_smp_processor_id();
1461         unsigned int i;
1462
1463         BUG_ON(mpic == NULL);
1464
1465         DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1466         raw_spin_lock_irqsave(&mpic_lock, flags);
1467
1468         /* let the mpic know we don't want intrs.  */
1469         for (i = 0; i < mpic->num_sources ; i++)
1470                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1471                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk);
1472
1473         /* Set current processor priority to max */
1474         mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1475         /* We need to EOI the IPI since not all platforms reset the MPIC
1476          * on boot and new interrupts wouldn't get delivered otherwise.
1477          */
1478         mpic_eoi(mpic);
1479
1480         raw_spin_unlock_irqrestore(&mpic_lock, flags);
1481 }
1482
1483
1484 static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg)
1485 {
1486         u32 src;
1487
1488         src = mpic_cpu_read(reg) & MPIC_INFO(VECPRI_VECTOR_MASK);
1489 #ifdef DEBUG_LOW
1490         DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic->name, reg, src);
1491 #endif
1492         if (unlikely(src == mpic->spurious_vec)) {
1493                 if (mpic->flags & MPIC_SPV_EOI)
1494                         mpic_eoi(mpic);
1495                 return NO_IRQ;
1496         }
1497         if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1498                 if (printk_ratelimit())
1499                         printk(KERN_WARNING "%s: Got protected source %d !\n",
1500                                mpic->name, (int)src);
1501                 mpic_eoi(mpic);
1502                 return NO_IRQ;
1503         }
1504
1505         return irq_linear_revmap(mpic->irqhost, src);
1506 }
1507
1508 unsigned int mpic_get_one_irq(struct mpic *mpic)
1509 {
1510         return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK));
1511 }
1512
1513 unsigned int mpic_get_irq(void)
1514 {
1515         struct mpic *mpic = mpic_primary;
1516
1517         BUG_ON(mpic == NULL);
1518
1519         return mpic_get_one_irq(mpic);
1520 }
1521
1522 unsigned int mpic_get_coreint_irq(void)
1523 {
1524 #ifdef CONFIG_BOOKE
1525         struct mpic *mpic = mpic_primary;
1526         u32 src;
1527
1528         BUG_ON(mpic == NULL);
1529
1530         src = mfspr(SPRN_EPR);
1531
1532         if (unlikely(src == mpic->spurious_vec)) {
1533                 if (mpic->flags & MPIC_SPV_EOI)
1534                         mpic_eoi(mpic);
1535                 return NO_IRQ;
1536         }
1537         if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1538                 if (printk_ratelimit())
1539                         printk(KERN_WARNING "%s: Got protected source %d !\n",
1540                                mpic->name, (int)src);
1541                 return NO_IRQ;
1542         }
1543
1544         return irq_linear_revmap(mpic->irqhost, src);
1545 #else
1546         return NO_IRQ;
1547 #endif
1548 }
1549
1550 unsigned int mpic_get_mcirq(void)
1551 {
1552         struct mpic *mpic = mpic_primary;
1553
1554         BUG_ON(mpic == NULL);
1555
1556         return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_MCACK));
1557 }
1558
1559 #ifdef CONFIG_SMP
1560 void mpic_request_ipis(void)
1561 {
1562         struct mpic *mpic = mpic_primary;
1563         int i;
1564         BUG_ON(mpic == NULL);
1565
1566         printk(KERN_INFO "mpic: requesting IPIs...\n");
1567
1568         for (i = 0; i < 4; i++) {
1569                 unsigned int vipi = irq_create_mapping(mpic->irqhost,
1570                                                        mpic->ipi_vecs[0] + i);
1571                 if (vipi == NO_IRQ) {
1572                         printk(KERN_ERR "Failed to map %s\n", smp_ipi_name[i]);
1573                         continue;
1574                 }
1575                 smp_request_message_ipi(vipi, i);
1576         }
1577 }
1578
1579 static void mpic_send_ipi(unsigned int ipi_no, const struct cpumask *cpu_mask)
1580 {
1581         struct mpic *mpic = mpic_primary;
1582
1583         BUG_ON(mpic == NULL);
1584
1585 #ifdef DEBUG_IPI
1586         DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no);
1587 #endif
1588
1589         mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) +
1590                        ipi_no * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE),
1591                        mpic_physmask(cpumask_bits(cpu_mask)[0]));
1592 }
1593
1594 void smp_mpic_message_pass(int target, int msg)
1595 {
1596         cpumask_var_t tmp;
1597
1598         /* make sure we're sending something that translates to an IPI */
1599         if ((unsigned int)msg > 3) {
1600                 printk("SMP %d: smp_message_pass: unknown msg %d\n",
1601                        smp_processor_id(), msg);
1602                 return;
1603         }
1604         switch (target) {
1605         case MSG_ALL:
1606                 mpic_send_ipi(msg, cpu_online_mask);
1607                 break;
1608         case MSG_ALL_BUT_SELF:
1609                 alloc_cpumask_var(&tmp, GFP_NOWAIT);
1610                 cpumask_andnot(tmp, cpu_online_mask,
1611                                cpumask_of(smp_processor_id()));
1612                 mpic_send_ipi(msg, tmp);
1613                 free_cpumask_var(tmp);
1614                 break;
1615         default:
1616                 mpic_send_ipi(msg, cpumask_of(target));
1617                 break;
1618         }
1619 }
1620
1621 int __init smp_mpic_probe(void)
1622 {
1623         int nr_cpus;
1624
1625         DBG("smp_mpic_probe()...\n");
1626
1627         nr_cpus = cpumask_weight(cpu_possible_mask);
1628
1629         DBG("nr_cpus: %d\n", nr_cpus);
1630
1631         if (nr_cpus > 1)
1632                 mpic_request_ipis();
1633
1634         return nr_cpus;
1635 }
1636
1637 void __devinit smp_mpic_setup_cpu(int cpu)
1638 {
1639         mpic_setup_this_cpu();
1640 }
1641
1642 void mpic_reset_core(int cpu)
1643 {
1644         struct mpic *mpic = mpic_primary;
1645         u32 pir;
1646         int cpuid = get_hard_smp_processor_id(cpu);
1647
1648         /* Set target bit for core reset */
1649         pir = mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1650         pir |= (1 << cpuid);
1651         mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
1652         mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1653
1654         /* Restore target bit after reset complete */
1655         pir &= ~(1 << cpuid);
1656         mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
1657         mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1658 }
1659 #endif /* CONFIG_SMP */
1660
1661 #ifdef CONFIG_PM
1662 static int mpic_suspend(struct sys_device *dev, pm_message_t state)
1663 {
1664         struct mpic *mpic = container_of(dev, struct mpic, sysdev);
1665         int i;
1666
1667         for (i = 0; i < mpic->num_sources; i++) {
1668                 mpic->save_data[i].vecprio =
1669                         mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI));
1670                 mpic->save_data[i].dest =
1671                         mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION));
1672         }
1673
1674         return 0;
1675 }
1676
1677 static int mpic_resume(struct sys_device *dev)
1678 {
1679         struct mpic *mpic = container_of(dev, struct mpic, sysdev);
1680         int i;
1681
1682         for (i = 0; i < mpic->num_sources; i++) {
1683                 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI),
1684                                mpic->save_data[i].vecprio);
1685                 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1686                                mpic->save_data[i].dest);
1687
1688 #ifdef CONFIG_MPIC_U3_HT_IRQS
1689         if (mpic->fixups) {
1690                 struct mpic_irq_fixup *fixup = &mpic->fixups[i];
1691
1692                 if (fixup->base) {
1693                         /* we use the lowest bit in an inverted meaning */
1694                         if ((mpic->save_data[i].fixup_data & 1) == 0)
1695                                 continue;
1696
1697                         /* Enable and configure */
1698                         writeb(0x10 + 2 * fixup->index, fixup->base + 2);
1699
1700                         writel(mpic->save_data[i].fixup_data & ~1,
1701                                fixup->base + 4);
1702                 }
1703         }
1704 #endif
1705         } /* end for loop */
1706
1707         return 0;
1708 }
1709 #endif
1710
1711 static struct sysdev_class mpic_sysclass = {
1712 #ifdef CONFIG_PM
1713         .resume = mpic_resume,
1714         .suspend = mpic_suspend,
1715 #endif
1716         .name = "mpic",
1717 };
1718
1719 static int mpic_init_sys(void)
1720 {
1721         struct mpic *mpic = mpics;
1722         int error, id = 0;
1723
1724         error = sysdev_class_register(&mpic_sysclass);
1725
1726         while (mpic && !error) {
1727                 mpic->sysdev.cls = &mpic_sysclass;
1728                 mpic->sysdev.id = id++;
1729                 error = sysdev_register(&mpic->sysdev);
1730                 mpic = mpic->next;
1731         }
1732         return error;
1733 }
1734
1735 device_initcall(mpic_init_sys);