arch/alpha/kernel/sys_marvel.c

   1 /*
   2  * linux/arch/alpha/kernel/sys_marvel.c
   3  *
   4  * Marvel / IO7 support
   5  */
   6
   7 #include <linux/kernel.h>
   8 #include <linux/types.h>
   9 #include <linux/mm.h>
  10 #include <linux/sched.h>
  11 #include <linux/pci.h>
  12 #include <linux/init.h>
  13 #include <linux/bitops.h>
  14
  15 #include <asm/ptrace.h>
  16 #include <asm/system.h>
  17 #include <asm/dma.h>
  18 #include <asm/irq.h>
  19 #include <asm/mmu_context.h>
  20 #include <asm/io.h>
  21 #include <asm/pgtable.h>
  22 #include <asm/core_marvel.h>
  23 #include <asm/hwrpb.h>
  24 #include <asm/tlbflush.h>
  25
  26 #include "proto.h"
  27 #include "err_impl.h"
  28 #include "irq_impl.h"
  29 #include "pci_impl.h"
  30 #include "machvec_impl.h"
  31
  32 #if NR_IRQS < MARVEL_NR_IRQS
  33 # error NR_IRQS < MARVEL_NR_IRQS !!!
  34 #endif
  35
  36 \f
  37 /*
  38  * Interrupt handling.
  39  */
  40 static void
  41 io7_device_interrupt(unsigned long vector, struct pt_regs * regs)
  42 {
  43         unsigned int pid;
  44         unsigned int irq;
  45
  46         /*
  47          * Vector is 0x800 + (interrupt)
  48          *
  49          * where (interrupt) is:
  50          *
  51          *      ...16|15 14|13     4|3 0
  52          *      -----+-----+--------+---
  53          *        PE |  0  |   irq  | 0
  54          *
  55          * where (irq) is
  56          *
  57          *       0x0800 - 0x0ff0         - 0x0800 + (LSI id << 4)
  58          *       0x1000 - 0x2ff0         - 0x1000 + (MSI_DAT<8:0> << 4)
  59          */
  60         pid = vector >> 16;
  61         irq = ((vector & 0xffff) - 0x800) >> 4;
  62
  63         irq += 16;                              /* offset for legacy */
  64         irq &= MARVEL_IRQ_VEC_IRQ_MASK;         /* not too many bits */
  65         irq |= pid << MARVEL_IRQ_VEC_PE_SHIFT;  /* merge the pid     */
  66
  67         handle_irq(irq, regs);
  68 }
  69
  70 static volatile unsigned long *
  71 io7_get_irq_ctl(unsigned int irq, struct io7 **pio7)
  72 {
  73         volatile unsigned long *ctl;
  74         unsigned int pid;
  75         struct io7 *io7;
  76
  77         pid = irq >> MARVEL_IRQ_VEC_PE_SHIFT;
  78
  79         if (!(io7 = marvel_find_io7(pid))) {
  80                 printk(KERN_ERR
  81                        "%s for nonexistent io7 -- vec %x, pid %d\n",
  82                        __FUNCTION__, irq, pid);
  83                 return NULL;
  84         }
  85
  86         irq &= MARVEL_IRQ_VEC_IRQ_MASK; /* isolate the vector    */
  87         irq -= 16;                      /* subtract legacy bias  */
  88
  89         if (irq >= 0x180) {
  90                 printk(KERN_ERR
  91                        "%s for invalid irq -- pid %d adjusted irq %x\n",
  92                        __FUNCTION__, pid, irq);
  93                 return NULL;
  94         }
  95
  96         ctl = &io7->csrs->PO7_LSI_CTL[irq & 0xff].csr; /* assume LSI */
  97         if (irq >= 0x80)                /* MSI */
  98                 ctl = &io7->csrs->PO7_MSI_CTL[((irq - 0x80) >> 5) & 0x0f].csr;
  99
 100         if (pio7) *pio7 = io7;
 101         return ctl;
 102 }
 103
 104 static void
 105 io7_enable_irq(unsigned int irq)
 106 {
 107         volatile unsigned long *ctl;
 108         struct io7 *io7;
 109
 110         ctl = io7_get_irq_ctl(irq, &io7);
 111         if (!ctl || !io7) {
 112                 printk(KERN_ERR "%s: get_ctl failed for irq %x\n",
 113                        __FUNCTION__, irq);
 114                 return;
 115         }
 116
 117         spin_lock(&io7->irq_lock);
 118         *ctl |= 1UL << 24;
 119         mb();
 120         *ctl;
 121         spin_unlock(&io7->irq_lock);
 122 }
 123
 124 static void
 125 io7_disable_irq(unsigned int irq)
 126 {
 127         volatile unsigned long *ctl;
 128         struct io7 *io7;
 129
 130         ctl = io7_get_irq_ctl(irq, &io7);
 131         if (!ctl || !io7) {
 132                 printk(KERN_ERR "%s: get_ctl failed for irq %x\n",
 133                        __FUNCTION__, irq);
 134                 return;
 135         }
 136
 137         spin_lock(&io7->irq_lock);
 138         *ctl &= ~(1UL << 24);
 139         mb();
 140         *ctl;
 141         spin_unlock(&io7->irq_lock);
 142 }
 143
 144 static unsigned int
 145 io7_startup_irq(unsigned int irq)
 146 {
 147         io7_enable_irq(irq);
 148         return 0;       /* never anything pending */
 149 }
 150
 151 static void
 152 io7_end_irq(unsigned int irq)
 153 {
 154         if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
 155                 io7_enable_irq(irq);
 156 }
 157
 158 static void
 159 marvel_irq_noop(unsigned int irq)
 160 {
 161         return;
 162 }
 163
 164 static unsigned int
 165 marvel_irq_noop_return(unsigned int irq)
 166 {
 167         return 0;
 168 }
 169
 170 static struct hw_interrupt_type marvel_legacy_irq_type = {
 171         .typename       = "LEGACY",
 172         .startup        = marvel_irq_noop_return,
 173         .shutdown       = marvel_irq_noop,
 174         .enable         = marvel_irq_noop,
 175         .disable        = marvel_irq_noop,
 176         .ack            = marvel_irq_noop,
 177         .end            = marvel_irq_noop,
 178 };
 179
 180 static struct hw_interrupt_type io7_lsi_irq_type = {
 181         .typename       = "LSI",
 182         .startup        = io7_startup_irq,
 183         .shutdown       = io7_disable_irq,
 184         .enable         = io7_enable_irq,
 185         .disable        = io7_disable_irq,
 186         .ack            = io7_disable_irq,
 187         .end            = io7_end_irq,
 188 };
 189
 190 static struct hw_interrupt_type io7_msi_irq_type = {
 191         .typename       = "MSI",
 192         .startup        = io7_startup_irq,
 193         .shutdown       = io7_disable_irq,
 194         .enable         = io7_enable_irq,
 195         .disable        = io7_disable_irq,
 196         .ack            = marvel_irq_noop,
 197         .end            = io7_end_irq,
 198 };
 199
 200 static void
 201 io7_redirect_irq(struct io7 *io7,
 202                  volatile unsigned long *csr,
 203                  unsigned int where)
 204 {
 205         unsigned long val;
 206
 207         val = *csr;
 208         val &= ~(0x1ffUL << 24);                /* clear the target pid   */
 209         val |= ((unsigned long)where << 24);    /* set the new target pid */
 210
 211         *csr = val;
 212         mb();
 213         *csr;
 214 }
 215
 216 static void
 217 io7_redirect_one_lsi(struct io7 *io7, unsigned int which, unsigned int where)
 218 {
 219         unsigned long val;
 220
 221         /*
 222          * LSI_CTL has target PID @ 14
 223          */
 224         val = io7->csrs->PO7_LSI_CTL[which].csr;
 225         val &= ~(0x1ffUL << 14);                /* clear the target pid */
 226         val |= ((unsigned long)where << 14);    /* set the new target pid */
 227
 228         io7->csrs->PO7_LSI_CTL[which].csr = val;
 229         mb();
 230         io7->csrs->PO7_LSI_CTL[which].csr;
 231 }
 232
 233 static void
 234 io7_redirect_one_msi(struct io7 *io7, unsigned int which, unsigned int where)
 235 {
 236         unsigned long val;
 237
 238         /*
 239          * MSI_CTL has target PID @ 14
 240          */
 241         val = io7->csrs->PO7_MSI_CTL[which].csr;
 242         val &= ~(0x1ffUL << 14);                /* clear the target pid */
 243         val |= ((unsigned long)where << 14);    /* set the new target pid */
 244
 245         io7->csrs->PO7_MSI_CTL[which].csr = val;
 246         mb();
 247         io7->csrs->PO7_MSI_CTL[which].csr;
 248 }
 249
 250 static void __init
 251 init_one_io7_lsi(struct io7 *io7, unsigned int which, unsigned int where)
 252 {
 253         /*
 254          * LSI_CTL has target PID @ 14
 255          */
 256         io7->csrs->PO7_LSI_CTL[which].csr = ((unsigned long)where << 14);
 257         mb();
 258         io7->csrs->PO7_LSI_CTL[which].csr;
 259 }
 260
 261 static void __init
 262 init_one_io7_msi(struct io7 *io7, unsigned int which, unsigned int where)
 263 {
 264         /*
 265          * MSI_CTL has target PID @ 14
 266          */
 267         io7->csrs->PO7_MSI_CTL[which].csr = ((unsigned long)where << 14);
 268         mb();
 269         io7->csrs->PO7_MSI_CTL[which].csr;
 270 }
 271
 272 static void __init
 273 init_io7_irqs(struct io7 *io7,
 274               struct hw_interrupt_type *lsi_ops,
 275               struct hw_interrupt_type *msi_ops)
 276 {
 277         long base = (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT) + 16;
 278         long i;
 279
 280         printk("Initializing interrupts for IO7 at PE %u - base %lx\n",
 281                 io7->pe, base);
 282
 283         /*
 284          * Where should interrupts from this IO7 go?
 285          *
 286          * They really should be sent to the local CPU to avoid having to
 287          * traverse the mesh, but if it's not an SMP kernel, they have to
 288          * go to the boot CPU. Send them all to the boot CPU for now,
 289          * as each secondary starts, it can redirect it's local device
 290          * interrupts.
 291          */
 292         printk("  Interrupts reported to CPU at PE %u\n", boot_cpuid);
 293
 294         spin_lock(&io7->irq_lock);
 295
 296         /* set up the error irqs */
 297         io7_redirect_irq(io7, &io7->csrs->HLT_CTL.csr, boot_cpuid);
 298         io7_redirect_irq(io7, &io7->csrs->HPI_CTL.csr, boot_cpuid);
 299         io7_redirect_irq(io7, &io7->csrs->CRD_CTL.csr, boot_cpuid);
 300         io7_redirect_irq(io7, &io7->csrs->STV_CTL.csr, boot_cpuid);
 301         io7_redirect_irq(io7, &io7->csrs->HEI_CTL.csr, boot_cpuid);
 302
 303         /* Set up the lsi irqs.  */
 304         for (i = 0; i < 128; ++i) {
 305                 irq_desc[base + i].status = IRQ_DISABLED | IRQ_LEVEL;
 306                 irq_desc[base + i].handler = lsi_ops;
 307         }
 308
 309         /* Disable the implemented irqs in hardware.  */
 310         for (i = 0; i < 0x60; ++i)
 311                 init_one_io7_lsi(io7, i, boot_cpuid);
 312
 313         init_one_io7_lsi(io7, 0x74, boot_cpuid);
 314         init_one_io7_lsi(io7, 0x75, boot_cpuid);
 315
 316
 317         /* Set up the msi irqs.  */
 318         for (i = 128; i < (128 + 512); ++i) {
 319                 irq_desc[base + i].status = IRQ_DISABLED | IRQ_LEVEL;
 320                 irq_desc[base + i].handler = msi_ops;
 321         }
 322
 323         for (i = 0; i < 16; ++i)
 324                 init_one_io7_msi(io7, i, boot_cpuid);
 325
 326         spin_unlock(&io7->irq_lock);
 327 }
 328
 329 static void __init
 330 marvel_init_irq(void)
 331 {
 332         int i;
 333         struct io7 *io7 = NULL;
 334
 335         /* Reserve the legacy irqs.  */
 336         for (i = 0; i < 16; ++i) {
 337                 irq_desc[i].status = IRQ_DISABLED;
 338                 irq_desc[i].handler = &marvel_legacy_irq_type;
 339         }
 340
 341         /* Init the io7 irqs.  */
 342         for (io7 = NULL; (io7 = marvel_next_io7(io7)) != NULL; )
 343                 init_io7_irqs(io7, &io7_lsi_irq_type, &io7_msi_irq_type);
 344 }
 345
 346 static int
 347 marvel_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
 348 {
 349         struct pci_controller *hose = dev->sysdata;
 350         struct io7_port *io7_port = hose->sysdata;
 351         struct io7 *io7 = io7_port->io7;
 352         int msi_loc, msi_data_off;
 353         u16 msg_ctl;
 354         u16 msg_dat;
 355         u8 intline;
 356         int irq;
 357
 358         pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &intline);
 359         irq = intline;
 360
 361         msi_loc = pci_find_capability(dev, PCI_CAP_ID_MSI);
 362         msg_ctl = 0;
 363         if (msi_loc)
 364                 pci_read_config_word(dev, msi_loc + PCI_MSI_FLAGS, &msg_ctl);
 365
 366         if (msg_ctl & PCI_MSI_FLAGS_ENABLE) {
 367                 msi_data_off = PCI_MSI_DATA_32;
 368                 if (msg_ctl & PCI_MSI_FLAGS_64BIT)
 369                         msi_data_off = PCI_MSI_DATA_64;
 370                 pci_read_config_word(dev, msi_loc + msi_data_off, &msg_dat);
 371
 372                 irq = msg_dat & 0x1ff;          /* we use msg_data<8:0> */
 373                 irq += 0x80;                    /* offset for lsi       */
 374
 375 #if 1
 376                 printk("PCI:%d:%d:%d (hose %d) [%s] is using MSI\n",
 377                        dev->bus->number,
 378                        PCI_SLOT(dev->devfn),
 379                        PCI_FUNC(dev->devfn),
 380                        hose->index,
 381                        pci_pretty_name (dev));
 382                 printk("  %d message(s) from 0x%04x\n",
 383                        1 << ((msg_ctl & PCI_MSI_FLAGS_QSIZE) >> 4),
 384                        msg_dat);
 385                 printk("  reporting on %d IRQ(s) from %d (0x%x)\n",
 386                        1 << ((msg_ctl & PCI_MSI_FLAGS_QSIZE) >> 4),
 387                        (irq + 16) | (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT),
 388                        (irq + 16) | (io7->pe << MARVEL_IRQ_VEC_PE_SHIFT));
 389 #endif
 390
 391 #if 0
 392                 pci_write_config_word(dev, msi_loc + PCI_MSI_FLAGS,
 393                                       msg_ctl & ~PCI_MSI_FLAGS_ENABLE);
 394                 pci_read_config_byte(dev, PCI_INTERRUPT_LINE, &intline);
 395                 irq = intline;
 396
 397                 printk("  forcing LSI interrupt on irq %d [0x%x]\n", irq, irq);
 398 #endif
 399         }
 400
 401         irq += 16;                                      /* offset for legacy */
 402         irq |= io7->pe << MARVEL_IRQ_VEC_PE_SHIFT;      /* merge the pid     */
 403
 404         return irq;
 405 }
 406
 407 static void __init
 408 marvel_init_pci(void)
 409 {
 410         struct io7 *io7;
 411
 412         marvel_register_error_handlers();
 413
 414         pci_probe_only = 1;
 415         common_init_pci();
 416
 417 #ifdef CONFIG_VGA_HOSE
 418         locate_and_init_vga(NULL);
 419 #endif
 420
 421         /* Clear any io7 errors.  */
 422         for (io7 = NULL; (io7 = marvel_next_io7(io7)) != NULL; )
 423                 io7_clear_errors(io7);
 424 }
 425
 426 static void
 427 marvel_init_rtc(void)
 428 {
 429         init_rtc_irq();
 430 }
 431
 432 static void
 433 marvel_smp_callin(void)
 434 {
 435         int cpuid = hard_smp_processor_id();
 436         struct io7 *io7 = marvel_find_io7(cpuid);
 437         unsigned int i;
 438
 439         if (!io7)
 440                 return;
 441
 442         /*
 443          * There is a local IO7 - redirect all of its interrupts here.
 444          */
 445         printk("Redirecting IO7 interrupts to local CPU at PE %u\n", cpuid);
 446
 447         /* Redirect the error IRQS here.  */
 448         io7_redirect_irq(io7, &io7->csrs->HLT_CTL.csr, cpuid);
 449         io7_redirect_irq(io7, &io7->csrs->HPI_CTL.csr, cpuid);
 450         io7_redirect_irq(io7, &io7->csrs->CRD_CTL.csr, cpuid);
 451         io7_redirect_irq(io7, &io7->csrs->STV_CTL.csr, cpuid);
 452         io7_redirect_irq(io7, &io7->csrs->HEI_CTL.csr, cpuid);
 453
 454         /* Redirect the implemented LSIs here.  */
 455         for (i = 0; i < 0x60; ++i)
 456                 io7_redirect_one_lsi(io7, i, cpuid);
 457
 458         io7_redirect_one_lsi(io7, 0x74, cpuid);
 459         io7_redirect_one_lsi(io7, 0x75, cpuid);
 460
 461         /* Redirect the MSIs here.  */
 462         for (i = 0; i < 16; ++i)
 463                 io7_redirect_one_msi(io7, i, cpuid);
 464 }
 465 \f
 466 /*
 467  * System Vectors
 468  */
 469 struct alpha_machine_vector marvel_ev7_mv __initmv = {
 470         .vector_name            = "MARVEL/EV7",
 471         DO_EV7_MMU,
 472         DO_DEFAULT_RTC,
 473         DO_MARVEL_IO,
 474         .machine_check          = marvel_machine_check,
 475         .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
 476         .min_io_address         = DEFAULT_IO_BASE,
 477         .min_mem_address        = DEFAULT_MEM_BASE,
 478         .pci_dac_offset         = IO7_DAC_OFFSET,
 479
 480         .nr_irqs                = MARVEL_NR_IRQS,
 481         .device_interrupt       = io7_device_interrupt,
 482
 483         .agp_info               = marvel_agp_info,
 484
 485         .smp_callin             = marvel_smp_callin,
 486         .init_arch              = marvel_init_arch,
 487         .init_irq               = marvel_init_irq,
 488         .init_rtc               = marvel_init_rtc,
 489         .init_pci               = marvel_init_pci,
 490         .kill_arch              = marvel_kill_arch,
 491         .pci_map_irq            = marvel_map_irq,
 492         .pci_swizzle            = common_swizzle,
 493
 494         .pa_to_nid              = marvel_pa_to_nid,
 495         .cpuid_to_nid           = marvel_cpuid_to_nid,
 496         .node_mem_start         = marvel_node_mem_start,
 497         .node_mem_size          = marvel_node_mem_size,
 498 };
 499 ALIAS_MV(marvel_ev7)