arch/powerpc/platforms/pseries/setup.c

   1 /*
   2  *  64-bit pSeries and RS/6000 setup code.
   3  *
   4  *  Copyright (C) 1995  Linus Torvalds
   5  *  Adapted from 'alpha' version by Gary Thomas
   6  *  Modified by Cort Dougan (cort@cs.nmt.edu)
   7  *  Modified by PPC64 Team, IBM Corp
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version
  12  * 2 of the License, or (at your option) any later version.
  13  */
  14
  15 /*
  16  * bootup setup stuff..
  17  */
  18
  19 #undef DEBUG
  20
  21 #include <linux/cpu.h>
  22 #include <linux/errno.h>
  23 #include <linux/sched.h>
  24 #include <linux/kernel.h>
  25 #include <linux/mm.h>
  26 #include <linux/stddef.h>
  27 #include <linux/unistd.h>
  28 #include <linux/slab.h>
  29 #include <linux/user.h>
  30 #include <linux/a.out.h>
  31 #include <linux/tty.h>
  32 #include <linux/major.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/reboot.h>
  35 #include <linux/init.h>
  36 #include <linux/ioport.h>
  37 #include <linux/console.h>
  38 #include <linux/pci.h>
  39 #include <linux/utsname.h>
  40 #include <linux/adb.h>
  41 #include <linux/module.h>
  42 #include <linux/delay.h>
  43 #include <linux/irq.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/root_dev.h>
  46
  47 #include <asm/mmu.h>
  48 #include <asm/processor.h>
  49 #include <asm/io.h>
  50 #include <asm/pgtable.h>
  51 #include <asm/prom.h>
  52 #include <asm/rtas.h>
  53 #include <asm/pci-bridge.h>
  54 #include <asm/iommu.h>
  55 #include <asm/dma.h>
  56 #include <asm/machdep.h>
  57 #include <asm/irq.h>
  58 #include <asm/kexec.h>
  59 #include <asm/time.h>
  60 #include <asm/nvram.h>
  61 #include "xics.h"
  62 #include <asm/pmc.h>
  63 #include <asm/mpic.h>
  64 #include <asm/ppc-pci.h>
  65 #include <asm/i8259.h>
  66 #include <asm/udbg.h>
  67 #include <asm/smp.h>
  68
  69 #include "plpar_wrappers.h"
  70 #include "ras.h"
  71 #include "firmware.h"
  72
  73 #ifdef DEBUG
  74 #define DBG(fmt...) udbg_printf(fmt)
  75 #else
  76 #define DBG(fmt...)
  77 #endif
  78
  79 /* move those away to a .h */
  80 extern void smp_init_pseries_mpic(void);
  81 extern void smp_init_pseries_xics(void);
  82 extern void find_udbg_vterm(void);
  83
  84 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  85
  86 static void pseries_shared_idle_sleep(void);
  87 static void pseries_dedicated_idle_sleep(void);
  88
  89 static struct device_node *pSeries_mpic_node;
  90
  91 static void pSeries_show_cpuinfo(struct seq_file *m)
  92 {
  93         struct device_node *root;
  94         const char *model = "";
  95
  96         root = of_find_node_by_path("/");
  97         if (root)
  98                 model = get_property(root, "model", NULL);
  99         seq_printf(m, "machine\t\t: CHRP %s\n", model);
 100         of_node_put(root);
 101 }
 102
 103 /* Initialize firmware assisted non-maskable interrupts if
 104  * the firmware supports this feature.
 105  */
 106 static void __init fwnmi_init(void)
 107 {
 108         unsigned long system_reset_addr, machine_check_addr;
 109
 110         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 111         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 112                 return;
 113
 114         /* If the kernel's not linked at zero we point the firmware at low
 115          * addresses anyway, and use a trampoline to get to the real code. */
 116         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
 117         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
 118
 119         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
 120                                 machine_check_addr))
 121                 fwnmi_active = 1;
 122 }
 123
 124 void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc,
 125                           struct pt_regs *regs)
 126 {
 127         unsigned int cascade_irq = i8259_irq(regs);
 128         if (cascade_irq != NO_IRQ)
 129                 generic_handle_irq(cascade_irq, regs);
 130         desc->chip->eoi(irq);
 131 }
 132
 133 static void __init pseries_mpic_init_IRQ(void)
 134 {
 135         struct device_node *np, *old, *cascade = NULL;
 136         const unsigned int *addrp;
 137         unsigned long intack = 0;
 138         const unsigned int *opprop;
 139         unsigned long openpic_addr = 0;
 140         unsigned int cascade_irq;
 141         int naddr, n, i, opplen;
 142         struct mpic *mpic;
 143
 144         np = of_find_node_by_path("/");
 145         naddr = prom_n_addr_cells(np);
 146         opprop = get_property(np, "platform-open-pic", &opplen);
 147         if (opprop != 0) {
 148                 openpic_addr = of_read_number(opprop, naddr);
 149                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 150         }
 151         of_node_put(np);
 152
 153         BUG_ON(openpic_addr == 0);
 154
 155         /* Setup the openpic driver */
 156         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
 157                           MPIC_PRIMARY,
 158                           16, 250, /* isu size, irq count */
 159                           " MPIC     ");
 160         BUG_ON(mpic == NULL);
 161
 162         /* Add ISUs */
 163         opplen /= sizeof(u32);
 164         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 165                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
 166                 mpic_assign_isu(mpic, n, isuaddr);
 167         }
 168
 169         /* All ISUs are setup, complete initialization */
 170         mpic_init(mpic);
 171
 172         /* Look for cascade */
 173         for_each_node_by_type(np, "interrupt-controller")
 174                 if (device_is_compatible(np, "chrp,iic")) {
 175                         cascade = np;
 176                         break;
 177                 }
 178         if (cascade == NULL)
 179                 return;
 180
 181         cascade_irq = irq_of_parse_and_map(cascade, 0);
 182         if (cascade == NO_IRQ) {
 183                 printk(KERN_ERR "xics: failed to map cascade interrupt");
 184                 return;
 185         }
 186
 187         /* Check ACK type */
 188         for (old = of_node_get(cascade); old != NULL ; old = np) {
 189                 np = of_get_parent(old);
 190                 of_node_put(old);
 191                 if (np == NULL)
 192                         break;
 193                 if (strcmp(np->name, "pci") != 0)
 194                         continue;
 195                 addrp = get_property(np, "8259-interrupt-acknowledge",
 196                                             NULL);
 197                 if (addrp == NULL)
 198                         continue;
 199                 naddr = prom_n_addr_cells(np);
 200                 intack = addrp[naddr-1];
 201                 if (naddr > 1)
 202                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
 203         }
 204         if (intack)
 205                 printk(KERN_DEBUG "mpic: PCI 8259 intack at 0x%016lx\n",
 206                        intack);
 207         i8259_init(cascade, intack);
 208         of_node_put(cascade);
 209         set_irq_chained_handler(cascade_irq, pseries_8259_cascade);
 210 }
 211
 212 static void pseries_lpar_enable_pmcs(void)
 213 {
 214         unsigned long set, reset;
 215
 216         power4_enable_pmcs();
 217
 218         set = 1UL << 63;
 219         reset = 0;
 220         plpar_hcall_norets(H_PERFMON, set, reset);
 221
 222         /* instruct hypervisor to maintain PMCs */
 223         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 224                 get_lppaca()->pmcregs_in_use = 1;
 225 }
 226
 227 #ifdef CONFIG_KEXEC
 228 static void pseries_kexec_cpu_down_mpic(int crash_shutdown, int secondary)
 229 {
 230         mpic_teardown_this_cpu(secondary);
 231 }
 232
 233 static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
 234 {
 235         /* Don't risk a hypervisor call if we're crashing */
 236         if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
 237                 unsigned long addr;
 238
 239                 addr = __pa(get_slb_shadow());
 240                 if (unregister_slb_shadow(hard_smp_processor_id(), addr))
 241                         printk("SLB shadow buffer deregistration of "
 242                                "cpu %u (hw_cpu_id %d) failed\n",
 243                                smp_processor_id(),
 244                                hard_smp_processor_id());
 245
 246                 addr = __pa(get_lppaca());
 247                 if (unregister_vpa(hard_smp_processor_id(), addr)) {
 248                         printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
 249                                         "failed\n", smp_processor_id(),
 250                                         hard_smp_processor_id());
 251                 }
 252         }
 253         xics_teardown_cpu(secondary);
 254 }
 255 #endif /* CONFIG_KEXEC */
 256
 257 static void __init pseries_discover_pic(void)
 258 {
 259         struct device_node *np;
 260         const char *typep;
 261
 262         for (np = NULL; (np = of_find_node_by_name(np,
 263                                                    "interrupt-controller"));) {
 264                 typep = get_property(np, "compatible", NULL);
 265                 if (strstr(typep, "open-pic")) {
 266                         pSeries_mpic_node = of_node_get(np);
 267                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
 268                         ppc_md.get_irq        = mpic_get_irq;
 269 #ifdef CONFIG_KEXEC
 270                         ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_mpic;
 271 #endif
 272 #ifdef CONFIG_SMP
 273                         smp_init_pseries_mpic();
 274 #endif
 275                         return;
 276                 } else if (strstr(typep, "ppc-xicp")) {
 277                         ppc_md.init_IRQ       = xics_init_IRQ;
 278 #ifdef CONFIG_KEXEC
 279                         ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
 280 #endif
 281 #ifdef CONFIG_SMP
 282                         smp_init_pseries_xics();
 283 #endif
 284                         return;
 285                 }
 286         }
 287         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
 288                " interrupt-controller\n");
 289 }
 290
 291 static void __init pSeries_setup_arch(void)
 292 {
 293         /* Discover PIC type and setup ppc_md accordingly */
 294         pseries_discover_pic();
 295
 296         /* openpic global configuration register (64-bit format). */
 297         /* openpic Interrupt Source Unit pointer (64-bit format). */
 298         /* python0 facility area (mmio) (64-bit format) REAL address. */
 299
 300         /* init to some ~sane value until calibrate_delay() runs */
 301         loops_per_jiffy = 50000000;
 302
 303         if (ROOT_DEV == 0) {
 304                 printk("No ramdisk, default root is /dev/sda2\n");
 305                 ROOT_DEV = Root_SDA2;
 306         }
 307
 308         fwnmi_init();
 309
 310         /* Find and initialize PCI host bridges */
 311         init_pci_config_tokens();
 312         find_and_init_phbs();
 313         eeh_init();
 314
 315         pSeries_nvram_init();
 316
 317         /* Choose an idle loop */
 318         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 319                 vpa_init(boot_cpuid);
 320                 if (get_lppaca()->shared_proc) {
 321                         printk(KERN_DEBUG "Using shared processor idle loop\n");
 322                         ppc_md.power_save = pseries_shared_idle_sleep;
 323                 } else {
 324                         printk(KERN_DEBUG "Using dedicated idle loop\n");
 325                         ppc_md.power_save = pseries_dedicated_idle_sleep;
 326                 }
 327         } else {
 328                 printk(KERN_DEBUG "Using default idle loop\n");
 329         }
 330
 331         if (firmware_has_feature(FW_FEATURE_LPAR))
 332                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 333         else
 334                 ppc_md.enable_pmcs = power4_enable_pmcs;
 335 }
 336
 337 static int __init pSeries_init_panel(void)
 338 {
 339         /* Manually leave the kernel version on the panel. */
 340         ppc_md.progress("Linux ppc64\n", 0);
 341         ppc_md.progress(system_utsname.release, 0);
 342
 343         return 0;
 344 }
 345 arch_initcall(pSeries_init_panel);
 346
 347 static void pSeries_mach_cpu_die(void)
 348 {
 349         local_irq_disable();
 350         idle_task_exit();
 351         xics_teardown_cpu(0);
 352         rtas_stop_self();
 353         /* Should never get here... */
 354         BUG();
 355         for(;;);
 356 }
 357
 358 static int pseries_set_dabr(unsigned long dabr)
 359 {
 360         return plpar_hcall_norets(H_SET_DABR, dabr);
 361 }
 362
 363 static int pseries_set_xdabr(unsigned long dabr)
 364 {
 365         /* We want to catch accesses from kernel and userspace */
 366         return plpar_hcall_norets(H_SET_XDABR, dabr,
 367                         H_DABRX_KERNEL | H_DABRX_USER);
 368 }
 369
 370 /*
 371  * Early initialization.  Relocation is on but do not reference unbolted pages
 372  */
 373 static void __init pSeries_init_early(void)
 374 {
 375         DBG(" -> pSeries_init_early()\n");
 376
 377         fw_feature_init();
 378
 379         if (firmware_has_feature(FW_FEATURE_LPAR))
 380                 find_udbg_vterm();
 381
 382         if (firmware_has_feature(FW_FEATURE_DABR))
 383                 ppc_md.set_dabr = pseries_set_dabr;
 384         else if (firmware_has_feature(FW_FEATURE_XDABR))
 385                 ppc_md.set_dabr = pseries_set_xdabr;
 386
 387         iommu_init_early_pSeries();
 388
 389         DBG(" <- pSeries_init_early()\n");
 390 }
 391
 392
 393 static int pSeries_check_legacy_ioport(unsigned int baseport)
 394 {
 395         struct device_node *np;
 396
 397 #define I8042_DATA_REG  0x60
 398 #define FDC_BASE        0x3f0
 399
 400
 401         switch(baseport) {
 402         case I8042_DATA_REG:
 403                 np = of_find_node_by_type(NULL, "8042");
 404                 if (np == NULL)
 405                         return -ENODEV;
 406                 of_node_put(np);
 407                 break;
 408         case FDC_BASE:
 409                 np = of_find_node_by_type(NULL, "fdc");
 410                 if (np == NULL)
 411                         return -ENODEV;
 412                 of_node_put(np);
 413                 break;
 414         }
 415         return 0;
 416 }
 417
 418 /*
 419  * Called very early, MMU is off, device-tree isn't unflattened
 420  */
 421
 422 static int __init pSeries_probe_hypertas(unsigned long node,
 423                                          const char *uname, int depth,
 424                                          void *data)
 425 {
 426         if (depth != 1 ||
 427             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
 428                 return 0;
 429
 430         if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL) != NULL)
 431                 powerpc_firmware_features |= FW_FEATURE_LPAR;
 432
 433         if (firmware_has_feature(FW_FEATURE_LPAR))
 434                 hpte_init_lpar();
 435         else
 436                 hpte_init_native();
 437
 438         return 1;
 439 }
 440
 441 static int __init pSeries_probe(void)
 442 {
 443         unsigned long root = of_get_flat_dt_root();
 444         char *dtype = of_get_flat_dt_prop(of_get_flat_dt_root(),
 445                                           "device_type", NULL);
 446         if (dtype == NULL)
 447                 return 0;
 448         if (strcmp(dtype, "chrp"))
 449                 return 0;
 450
 451         /* Cell blades firmware claims to be chrp while it's not. Until this
 452          * is fixed, we need to avoid those here.
 453          */
 454         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 455             of_flat_dt_is_compatible(root, "IBM,CBEA"))
 456                 return 0;
 457
 458         DBG("pSeries detected, looking for LPAR capability...\n");
 459
 460         /* Now try to figure out if we are running on LPAR */
 461         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
 462
 463         DBG("Machine is%s LPAR !\n",
 464             (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
 465
 466         return 1;
 467 }
 468
 469
 470 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 471
 472 static void pseries_dedicated_idle_sleep(void)
 473 {
 474         unsigned int cpu = smp_processor_id();
 475         unsigned long start_snooze;
 476         unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
 477
 478         /*
 479          * Indicate to the HV that we are idle. Now would be
 480          * a good time to find other work to dispatch.
 481          */
 482         get_lppaca()->idle = 1;
 483
 484         /*
 485          * We come in with interrupts disabled, and need_resched()
 486          * has been checked recently.  If we should poll for a little
 487          * while, do so.
 488          */
 489         if (*smt_snooze_delay) {
 490                 start_snooze = get_tb() +
 491                         *smt_snooze_delay * tb_ticks_per_usec;
 492                 local_irq_enable();
 493                 set_thread_flag(TIF_POLLING_NRFLAG);
 494
 495                 while (get_tb() < start_snooze) {
 496                         if (need_resched() || cpu_is_offline(cpu))
 497                                 goto out;
 498                         ppc64_runlatch_off();
 499                         HMT_low();
 500                         HMT_very_low();
 501                 }
 502
 503                 HMT_medium();
 504                 clear_thread_flag(TIF_POLLING_NRFLAG);
 505                 smp_mb();
 506                 local_irq_disable();
 507                 if (need_resched() || cpu_is_offline(cpu))
 508                         goto out;
 509         }
 510
 511         /*
 512          * If not SMT, cede processor.  If CPU is running SMT
 513          * cede if the other thread is not idle, so that it can
 514          * go single-threaded.  If the other thread is idle,
 515          * we ask the hypervisor if it has pending work it
 516          * wants to do and cede if it does.  Otherwise we keep
 517          * polling in order to reduce interrupt latency.
 518          *
 519          * Doing the cede when the other thread is active will
 520          * result in this thread going dormant, meaning the other
 521          * thread gets to run in single-threaded (ST) mode, which
 522          * is slightly faster than SMT mode with this thread at
 523          * very low priority.  The cede enables interrupts, which
 524          * doesn't matter here.
 525          */
 526         if (!cpu_has_feature(CPU_FTR_SMT) || !lppaca[cpu ^ 1].idle
 527             || poll_pending() == H_PENDING)
 528                 cede_processor();
 529
 530 out:
 531         HMT_medium();
 532         get_lppaca()->idle = 0;
 533 }
 534
 535 static void pseries_shared_idle_sleep(void)
 536 {
 537         /*
 538          * Indicate to the HV that we are idle. Now would be
 539          * a good time to find other work to dispatch.
 540          */
 541         get_lppaca()->idle = 1;
 542
 543         /*
 544          * Yield the processor to the hypervisor.  We return if
 545          * an external interrupt occurs (which are driven prior
 546          * to returning here) or if a prod occurs from another
 547          * processor. When returning here, external interrupts
 548          * are enabled.
 549          */
 550         cede_processor();
 551
 552         get_lppaca()->idle = 0;
 553 }
 554
 555 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 556 {
 557         if (firmware_has_feature(FW_FEATURE_LPAR))
 558                 return PCI_PROBE_DEVTREE;
 559         return PCI_PROBE_NORMAL;
 560 }
 561
 562 define_machine(pseries) {
 563         .name                   = "pSeries",
 564         .probe                  = pSeries_probe,
 565         .setup_arch             = pSeries_setup_arch,
 566         .init_early             = pSeries_init_early,
 567         .show_cpuinfo           = pSeries_show_cpuinfo,
 568         .log_error              = pSeries_log_error,
 569         .pcibios_fixup          = pSeries_final_fixup,
 570         .pci_probe_mode         = pSeries_pci_probe_mode,
 571         .irq_bus_setup          = pSeries_irq_bus_setup,
 572         .restart                = rtas_restart,
 573         .power_off              = rtas_power_off,
 574         .halt                   = rtas_halt,
 575         .panic                  = rtas_os_term,
 576         .cpu_die                = pSeries_mach_cpu_die,
 577         .get_boot_time          = rtas_get_boot_time,
 578         .get_rtc_time           = rtas_get_rtc_time,
 579         .set_rtc_time           = rtas_set_rtc_time,
 580         .calibrate_decr         = generic_calibrate_decr,
 581         .progress               = rtas_progress,
 582         .check_legacy_ioport    = pSeries_check_legacy_ioport,
 583         .system_reset_exception = pSeries_system_reset_exception,
 584         .machine_check_exception = pSeries_machine_check_exception,
 585 #ifdef CONFIG_KEXEC
 586         .machine_kexec          = default_machine_kexec,
 587         .machine_kexec_prepare  = default_machine_kexec_prepare,
 588         .machine_crash_shutdown = default_machine_crash_shutdown,
 589 #endif
 590 };