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 {
 126         unsigned int cascade_irq = i8259_irq();
 127         if (cascade_irq != NO_IRQ)
 128                 generic_handle_irq(cascade_irq);
 129         desc->chip->eoi(irq);
 130 }
 131
 132 static void __init pseries_mpic_init_IRQ(void)
 133 {
 134         struct device_node *np, *old, *cascade = NULL;
 135         const unsigned int *addrp;
 136         unsigned long intack = 0;
 137         const unsigned int *opprop;
 138         unsigned long openpic_addr = 0;
 139         unsigned int cascade_irq;
 140         int naddr, n, i, opplen;
 141         struct mpic *mpic;
 142
 143         np = of_find_node_by_path("/");
 144         naddr = prom_n_addr_cells(np);
 145         opprop = get_property(np, "platform-open-pic", &opplen);
 146         if (opprop != 0) {
 147                 openpic_addr = of_read_number(opprop, naddr);
 148                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 149         }
 150         of_node_put(np);
 151
 152         BUG_ON(openpic_addr == 0);
 153
 154         /* Setup the openpic driver */
 155         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
 156                           MPIC_PRIMARY,
 157                           16, 250, /* isu size, irq count */
 158                           " MPIC     ");
 159         BUG_ON(mpic == NULL);
 160
 161         /* Add ISUs */
 162         opplen /= sizeof(u32);
 163         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 164                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
 165                 mpic_assign_isu(mpic, n, isuaddr);
 166         }
 167
 168         /* All ISUs are setup, complete initialization */
 169         mpic_init(mpic);
 170
 171         /* Look for cascade */
 172         for_each_node_by_type(np, "interrupt-controller")
 173                 if (device_is_compatible(np, "chrp,iic")) {
 174                         cascade = np;
 175                         break;
 176                 }
 177         if (cascade == NULL)
 178                 return;
 179
 180         cascade_irq = irq_of_parse_and_map(cascade, 0);
 181         if (cascade == NO_IRQ) {
 182                 printk(KERN_ERR "mpic: failed to map cascade interrupt");
 183                 return;
 184         }
 185
 186         /* Check ACK type */
 187         for (old = of_node_get(cascade); old != NULL ; old = np) {
 188                 np = of_get_parent(old);
 189                 of_node_put(old);
 190                 if (np == NULL)
 191                         break;
 192                 if (strcmp(np->name, "pci") != 0)
 193                         continue;
 194                 addrp = get_property(np, "8259-interrupt-acknowledge",
 195                                             NULL);
 196                 if (addrp == NULL)
 197                         continue;
 198                 naddr = prom_n_addr_cells(np);
 199                 intack = addrp[naddr-1];
 200                 if (naddr > 1)
 201                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
 202         }
 203         if (intack)
 204                 printk(KERN_DEBUG "mpic: PCI 8259 intack at 0x%016lx\n",
 205                        intack);
 206         i8259_init(cascade, intack);
 207         of_node_put(cascade);
 208         set_irq_chained_handler(cascade_irq, pseries_8259_cascade);
 209 }
 210
 211 static void pseries_lpar_enable_pmcs(void)
 212 {
 213         unsigned long set, reset;
 214
 215         set = 1UL << 63;
 216         reset = 0;
 217         plpar_hcall_norets(H_PERFMON, set, reset);
 218
 219         /* instruct hypervisor to maintain PMCs */
 220         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 221                 get_lppaca()->pmcregs_in_use = 1;
 222 }
 223
 224 #ifdef CONFIG_KEXEC
 225 static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
 226 {
 227         /* Don't risk a hypervisor call if we're crashing */
 228         if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
 229                 unsigned long addr;
 230
 231                 addr = __pa(get_slb_shadow());
 232                 if (unregister_slb_shadow(hard_smp_processor_id(), addr))
 233                         printk("SLB shadow buffer deregistration of "
 234                                "cpu %u (hw_cpu_id %d) failed\n",
 235                                smp_processor_id(),
 236                                hard_smp_processor_id());
 237
 238                 addr = __pa(get_lppaca());
 239                 if (unregister_vpa(hard_smp_processor_id(), addr)) {
 240                         printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
 241                                         "failed\n", smp_processor_id(),
 242                                         hard_smp_processor_id());
 243                 }
 244         }
 245 }
 246
 247 static void pseries_kexec_cpu_down_mpic(int crash_shutdown, int secondary)
 248 {
 249         pseries_kexec_cpu_down(crash_shutdown, secondary);
 250         mpic_teardown_this_cpu(secondary);
 251 }
 252
 253 static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
 254 {
 255         pseries_kexec_cpu_down(crash_shutdown, secondary);
 256         xics_teardown_cpu(secondary);
 257 }
 258 #endif /* CONFIG_KEXEC */
 259
 260 static void __init pseries_discover_pic(void)
 261 {
 262         struct device_node *np;
 263         const char *typep;
 264
 265         for (np = NULL; (np = of_find_node_by_name(np,
 266                                                    "interrupt-controller"));) {
 267                 typep = get_property(np, "compatible", NULL);
 268                 if (strstr(typep, "open-pic")) {
 269                         pSeries_mpic_node = of_node_get(np);
 270                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
 271                         ppc_md.get_irq        = mpic_get_irq;
 272 #ifdef CONFIG_KEXEC
 273                         ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_mpic;
 274 #endif
 275 #ifdef CONFIG_SMP
 276                         smp_init_pseries_mpic();
 277 #endif
 278                         return;
 279                 } else if (strstr(typep, "ppc-xicp")) {
 280                         ppc_md.init_IRQ       = xics_init_IRQ;
 281 #ifdef CONFIG_KEXEC
 282                         ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
 283 #endif
 284 #ifdef CONFIG_SMP
 285                         smp_init_pseries_xics();
 286 #endif
 287                         return;
 288                 }
 289         }
 290         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
 291                " interrupt-controller\n");
 292 }
 293
 294 static void __init pSeries_setup_arch(void)
 295 {
 296         /* Discover PIC type and setup ppc_md accordingly */
 297         pseries_discover_pic();
 298
 299         /* openpic global configuration register (64-bit format). */
 300         /* openpic Interrupt Source Unit pointer (64-bit format). */
 301         /* python0 facility area (mmio) (64-bit format) REAL address. */
 302
 303         /* init to some ~sane value until calibrate_delay() runs */
 304         loops_per_jiffy = 50000000;
 305
 306         if (ROOT_DEV == 0) {
 307                 printk("No ramdisk, default root is /dev/sda2\n");
 308                 ROOT_DEV = Root_SDA2;
 309         }
 310
 311         fwnmi_init();
 312
 313         /* Find and initialize PCI host bridges */
 314         init_pci_config_tokens();
 315         find_and_init_phbs();
 316         eeh_init();
 317
 318         pSeries_nvram_init();
 319
 320         /* Choose an idle loop */
 321         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 322                 vpa_init(boot_cpuid);
 323                 if (get_lppaca()->shared_proc) {
 324                         printk(KERN_DEBUG "Using shared processor idle loop\n");
 325                         ppc_md.power_save = pseries_shared_idle_sleep;
 326                 } else {
 327                         printk(KERN_DEBUG "Using dedicated idle loop\n");
 328                         ppc_md.power_save = pseries_dedicated_idle_sleep;
 329                 }
 330         } else {
 331                 printk(KERN_DEBUG "Using default idle loop\n");
 332         }
 333
 334         if (firmware_has_feature(FW_FEATURE_LPAR))
 335                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 336         else
 337                 ppc_md.enable_pmcs = power4_enable_pmcs;
 338 }
 339
 340 static int __init pSeries_init_panel(void)
 341 {
 342         /* Manually leave the kernel version on the panel. */
 343         ppc_md.progress("Linux ppc64\n", 0);
 344         ppc_md.progress(init_utsname()->version, 0);
 345
 346         return 0;
 347 }
 348 arch_initcall(pSeries_init_panel);
 349
 350 static void pSeries_mach_cpu_die(void)
 351 {
 352         local_irq_disable();
 353         idle_task_exit();
 354         xics_teardown_cpu(0);
 355         rtas_stop_self();
 356         /* Should never get here... */
 357         BUG();
 358         for(;;);
 359 }
 360
 361 static int pseries_set_dabr(unsigned long dabr)
 362 {
 363         return plpar_hcall_norets(H_SET_DABR, dabr);
 364 }
 365
 366 static int pseries_set_xdabr(unsigned long dabr)
 367 {
 368         /* We want to catch accesses from kernel and userspace */
 369         return plpar_hcall_norets(H_SET_XDABR, dabr,
 370                         H_DABRX_KERNEL | H_DABRX_USER);
 371 }
 372
 373 /*
 374  * Early initialization.  Relocation is on but do not reference unbolted pages
 375  */
 376 static void __init pSeries_init_early(void)
 377 {
 378         DBG(" -> pSeries_init_early()\n");
 379
 380         fw_feature_init();
 381
 382         if (firmware_has_feature(FW_FEATURE_LPAR))
 383                 find_udbg_vterm();
 384
 385         if (firmware_has_feature(FW_FEATURE_DABR))
 386                 ppc_md.set_dabr = pseries_set_dabr;
 387         else if (firmware_has_feature(FW_FEATURE_XDABR))
 388                 ppc_md.set_dabr = pseries_set_xdabr;
 389
 390         iommu_init_early_pSeries();
 391
 392         DBG(" <- pSeries_init_early()\n");
 393 }
 394
 395
 396 static int pSeries_check_legacy_ioport(unsigned int baseport)
 397 {
 398         struct device_node *np;
 399
 400 #define I8042_DATA_REG  0x60
 401 #define FDC_BASE        0x3f0
 402
 403
 404         switch(baseport) {
 405         case I8042_DATA_REG:
 406                 np = of_find_node_by_type(NULL, "8042");
 407                 if (np == NULL)
 408                         return -ENODEV;
 409                 of_node_put(np);
 410                 break;
 411         case FDC_BASE:
 412                 np = of_find_node_by_type(NULL, "fdc");
 413                 if (np == NULL)
 414                         return -ENODEV;
 415                 of_node_put(np);
 416                 break;
 417         }
 418         return 0;
 419 }
 420
 421 /*
 422  * Called very early, MMU is off, device-tree isn't unflattened
 423  */
 424
 425 static int __init pSeries_probe_hypertas(unsigned long node,
 426                                          const char *uname, int depth,
 427                                          void *data)
 428 {
 429         if (depth != 1 ||
 430             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
 431                 return 0;
 432
 433         if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL) != NULL)
 434                 powerpc_firmware_features |= FW_FEATURE_LPAR;
 435
 436         if (firmware_has_feature(FW_FEATURE_LPAR))
 437                 hpte_init_lpar();
 438         else
 439                 hpte_init_native();
 440
 441         return 1;
 442 }
 443
 444 static int __init pSeries_probe(void)
 445 {
 446         unsigned long root = of_get_flat_dt_root();
 447         char *dtype = of_get_flat_dt_prop(of_get_flat_dt_root(),
 448                                           "device_type", NULL);
 449         if (dtype == NULL)
 450                 return 0;
 451         if (strcmp(dtype, "chrp"))
 452                 return 0;
 453
 454         /* Cell blades firmware claims to be chrp while it's not. Until this
 455          * is fixed, we need to avoid those here.
 456          */
 457         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 458             of_flat_dt_is_compatible(root, "IBM,CBEA"))
 459                 return 0;
 460
 461         DBG("pSeries detected, looking for LPAR capability...\n");
 462
 463         /* Now try to figure out if we are running on LPAR */
 464         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
 465
 466         DBG("Machine is%s LPAR !\n",
 467             (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
 468
 469         return 1;
 470 }
 471
 472
 473 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 474
 475 static void pseries_dedicated_idle_sleep(void)
 476 {
 477         unsigned int cpu = smp_processor_id();
 478         unsigned long start_snooze;
 479
 480         /*
 481          * Indicate to the HV that we are idle. Now would be
 482          * a good time to find other work to dispatch.
 483          */
 484         get_lppaca()->idle = 1;
 485
 486         /*
 487          * We come in with interrupts disabled, and need_resched()
 488          * has been checked recently.  If we should poll for a little
 489          * while, do so.
 490          */
 491         if (__get_cpu_var(smt_snooze_delay)) {
 492                 start_snooze = get_tb() +
 493                         __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
 494                 local_irq_enable();
 495                 set_thread_flag(TIF_POLLING_NRFLAG);
 496
 497                 while (get_tb() < start_snooze) {
 498                         if (need_resched() || cpu_is_offline(cpu))
 499                                 goto out;
 500                         ppc64_runlatch_off();
 501                         HMT_low();
 502                         HMT_very_low();
 503                 }
 504
 505                 HMT_medium();
 506                 clear_thread_flag(TIF_POLLING_NRFLAG);
 507                 smp_mb();
 508                 local_irq_disable();
 509                 if (need_resched() || cpu_is_offline(cpu))
 510                         goto out;
 511         }
 512
 513         cede_processor();
 514
 515 out:
 516         HMT_medium();
 517         get_lppaca()->idle = 0;
 518 }
 519
 520 static void pseries_shared_idle_sleep(void)
 521 {
 522         /*
 523          * Indicate to the HV that we are idle. Now would be
 524          * a good time to find other work to dispatch.
 525          */
 526         get_lppaca()->idle = 1;
 527
 528         /*
 529          * Yield the processor to the hypervisor.  We return if
 530          * an external interrupt occurs (which are driven prior
 531          * to returning here) or if a prod occurs from another
 532          * processor. When returning here, external interrupts
 533          * are enabled.
 534          */
 535         cede_processor();
 536
 537         get_lppaca()->idle = 0;
 538 }
 539
 540 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 541 {
 542         if (firmware_has_feature(FW_FEATURE_LPAR))
 543                 return PCI_PROBE_DEVTREE;
 544         return PCI_PROBE_NORMAL;
 545 }
 546
 547 define_machine(pseries) {
 548         .name                   = "pSeries",
 549         .probe                  = pSeries_probe,
 550         .setup_arch             = pSeries_setup_arch,
 551         .init_early             = pSeries_init_early,
 552         .show_cpuinfo           = pSeries_show_cpuinfo,
 553         .log_error              = pSeries_log_error,
 554         .pcibios_fixup          = pSeries_final_fixup,
 555         .pci_probe_mode         = pSeries_pci_probe_mode,
 556         .irq_bus_setup          = pSeries_irq_bus_setup,
 557         .restart                = rtas_restart,
 558         .power_off              = rtas_power_off,
 559         .halt                   = rtas_halt,
 560         .panic                  = rtas_os_term,
 561         .cpu_die                = pSeries_mach_cpu_die,
 562         .get_boot_time          = rtas_get_boot_time,
 563         .get_rtc_time           = rtas_get_rtc_time,
 564         .set_rtc_time           = rtas_set_rtc_time,
 565         .calibrate_decr         = generic_calibrate_decr,
 566         .progress               = rtas_progress,
 567         .check_legacy_ioport    = pSeries_check_legacy_ioport,
 568         .system_reset_exception = pSeries_system_reset_exception,
 569         .machine_check_exception = pSeries_machine_check_exception,
 570 #ifdef CONFIG_KEXEC
 571         .machine_kexec          = default_machine_kexec,
 572         .machine_kexec_prepare  = default_machine_kexec_prepare,
 573         .machine_crash_shutdown = default_machine_crash_shutdown,
 574 #endif
 575 };