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 #include <linux/cpu.h>
  20 #include <linux/errno.h>
  21 #include <linux/sched.h>
  22 #include <linux/kernel.h>
  23 #include <linux/mm.h>
  24 #include <linux/stddef.h>
  25 #include <linux/unistd.h>
  26 #include <linux/user.h>
  27 #include <linux/tty.h>
  28 #include <linux/major.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/reboot.h>
  31 #include <linux/init.h>
  32 #include <linux/ioport.h>
  33 #include <linux/console.h>
  34 #include <linux/pci.h>
  35 #include <linux/utsname.h>
  36 #include <linux/adb.h>
  37 #include <linux/module.h>
  38 #include <linux/delay.h>
  39 #include <linux/irq.h>
  40 #include <linux/seq_file.h>
  41 #include <linux/root_dev.h>
  42
  43 #include <asm/mmu.h>
  44 #include <asm/processor.h>
  45 #include <asm/io.h>
  46 #include <asm/pgtable.h>
  47 #include <asm/prom.h>
  48 #include <asm/rtas.h>
  49 #include <asm/pci-bridge.h>
  50 #include <asm/iommu.h>
  51 #include <asm/dma.h>
  52 #include <asm/machdep.h>
  53 #include <asm/irq.h>
  54 #include <asm/time.h>
  55 #include <asm/nvram.h>
  56 #include "xics.h"
  57 #include <asm/pmc.h>
  58 #include <asm/mpic.h>
  59 #include <asm/ppc-pci.h>
  60 #include <asm/i8259.h>
  61 #include <asm/udbg.h>
  62 #include <asm/smp.h>
  63 #include <asm/firmware.h>
  64 #include <asm/eeh.h>
  65 #include <asm/pSeries_reconfig.h>
  66
  67 #include "plpar_wrappers.h"
  68 #include "pseries.h"
  69
  70 int CMO_PrPSP = -1;
  71 int CMO_SecPSP = -1;
  72 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT);
  73 EXPORT_SYMBOL(CMO_PageSize);
  74
  75 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  76
  77 static void pseries_shared_idle_sleep(void);
  78 static void pseries_dedicated_idle_sleep(void);
  79
  80 static struct device_node *pSeries_mpic_node;
  81
  82 static void pSeries_show_cpuinfo(struct seq_file *m)
  83 {
  84         struct device_node *root;
  85         const char *model = "";
  86
  87         root = of_find_node_by_path("/");
  88         if (root)
  89                 model = of_get_property(root, "model", NULL);
  90         seq_printf(m, "machine\t\t: CHRP %s\n", model);
  91         of_node_put(root);
  92 }
  93
  94 /* Initialize firmware assisted non-maskable interrupts if
  95  * the firmware supports this feature.
  96  */
  97 static void __init fwnmi_init(void)
  98 {
  99         unsigned long system_reset_addr, machine_check_addr;
 100
 101         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 102         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 103                 return;
 104
 105         /* If the kernel's not linked at zero we point the firmware at low
 106          * addresses anyway, and use a trampoline to get to the real code. */
 107         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
 108         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
 109
 110         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
 111                                 machine_check_addr))
 112                 fwnmi_active = 1;
 113 }
 114
 115 static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
 116 {
 117         unsigned int cascade_irq = i8259_irq();
 118         if (cascade_irq != NO_IRQ)
 119                 generic_handle_irq(cascade_irq);
 120         desc->chip->eoi(irq);
 121 }
 122
 123 static void __init pseries_setup_i8259_cascade(void)
 124 {
 125         struct device_node *np, *old, *found = NULL;
 126         unsigned int cascade;
 127         const u32 *addrp;
 128         unsigned long intack = 0;
 129         int naddr;
 130
 131         for_each_node_by_type(np, "interrupt-controller") {
 132                 if (of_device_is_compatible(np, "chrp,iic")) {
 133                         found = np;
 134                         break;
 135                 }
 136         }
 137
 138         if (found == NULL) {
 139                 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
 140                 return;
 141         }
 142
 143         cascade = irq_of_parse_and_map(found, 0);
 144         if (cascade == NO_IRQ) {
 145                 printk(KERN_ERR "pic: failed to map cascade interrupt");
 146                 return;
 147         }
 148         pr_debug("pic: cascade mapped to irq %d\n", cascade);
 149
 150         for (old = of_node_get(found); old != NULL ; old = np) {
 151                 np = of_get_parent(old);
 152                 of_node_put(old);
 153                 if (np == NULL)
 154                         break;
 155                 if (strcmp(np->name, "pci") != 0)
 156                         continue;
 157                 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
 158                 if (addrp == NULL)
 159                         continue;
 160                 naddr = of_n_addr_cells(np);
 161                 intack = addrp[naddr-1];
 162                 if (naddr > 1)
 163                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
 164         }
 165         if (intack)
 166                 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
 167         i8259_init(found, intack);
 168         of_node_put(found);
 169         set_irq_chained_handler(cascade, pseries_8259_cascade);
 170 }
 171
 172 static void __init pseries_mpic_init_IRQ(void)
 173 {
 174         struct device_node *np;
 175         const unsigned int *opprop;
 176         unsigned long openpic_addr = 0;
 177         int naddr, n, i, opplen;
 178         struct mpic *mpic;
 179
 180         np = of_find_node_by_path("/");
 181         naddr = of_n_addr_cells(np);
 182         opprop = of_get_property(np, "platform-open-pic", &opplen);
 183         if (opprop != 0) {
 184                 openpic_addr = of_read_number(opprop, naddr);
 185                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 186         }
 187         of_node_put(np);
 188
 189         BUG_ON(openpic_addr == 0);
 190
 191         /* Setup the openpic driver */
 192         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
 193                           MPIC_PRIMARY,
 194                           16, 250, /* isu size, irq count */
 195                           " MPIC     ");
 196         BUG_ON(mpic == NULL);
 197
 198         /* Add ISUs */
 199         opplen /= sizeof(u32);
 200         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 201                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
 202                 mpic_assign_isu(mpic, n, isuaddr);
 203         }
 204
 205         /* All ISUs are setup, complete initialization */
 206         mpic_init(mpic);
 207
 208         /* Look for cascade */
 209         pseries_setup_i8259_cascade();
 210 }
 211
 212 static void __init pseries_xics_init_IRQ(void)
 213 {
 214         xics_init_IRQ();
 215         pseries_setup_i8259_cascade();
 216 }
 217
 218 static void pseries_lpar_enable_pmcs(void)
 219 {
 220         unsigned long set, reset;
 221
 222         set = 1UL << 63;
 223         reset = 0;
 224         plpar_hcall_norets(H_PERFMON, set, reset);
 225 }
 226
 227 static void __init pseries_discover_pic(void)
 228 {
 229         struct device_node *np;
 230         const char *typep;
 231
 232         for (np = NULL; (np = of_find_node_by_name(np,
 233                                                    "interrupt-controller"));) {
 234                 typep = of_get_property(np, "compatible", NULL);
 235                 if (strstr(typep, "open-pic")) {
 236                         pSeries_mpic_node = of_node_get(np);
 237                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
 238                         ppc_md.get_irq        = mpic_get_irq;
 239                         setup_kexec_cpu_down_mpic();
 240                         smp_init_pseries_mpic();
 241                         return;
 242                 } else if (strstr(typep, "ppc-xicp")) {
 243                         ppc_md.init_IRQ       = pseries_xics_init_IRQ;
 244                         setup_kexec_cpu_down_xics();
 245                         smp_init_pseries_xics();
 246                         return;
 247                 }
 248         }
 249         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
 250                " interrupt-controller\n");
 251 }
 252
 253 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
 254 {
 255         struct device_node *np = node;
 256         struct pci_dn *pci = NULL;
 257         int err = NOTIFY_OK;
 258
 259         switch (action) {
 260         case PSERIES_RECONFIG_ADD:
 261                 pci = np->parent->data;
 262                 if (pci)
 263                         update_dn_pci_info(np, pci->phb);
 264                 break;
 265         default:
 266                 err = NOTIFY_DONE;
 267                 break;
 268         }
 269         return err;
 270 }
 271
 272 static struct notifier_block pci_dn_reconfig_nb = {
 273         .notifier_call = pci_dn_reconfig_notifier,
 274 };
 275
 276 static void __init pSeries_setup_arch(void)
 277 {
 278         /* Discover PIC type and setup ppc_md accordingly */
 279         pseries_discover_pic();
 280
 281         /* openpic global configuration register (64-bit format). */
 282         /* openpic Interrupt Source Unit pointer (64-bit format). */
 283         /* python0 facility area (mmio) (64-bit format) REAL address. */
 284
 285         /* init to some ~sane value until calibrate_delay() runs */
 286         loops_per_jiffy = 50000000;
 287
 288         fwnmi_init();
 289
 290         /* Find and initialize PCI host bridges */
 291         init_pci_config_tokens();
 292         find_and_init_phbs();
 293         pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb);
 294         eeh_init();
 295
 296         pSeries_nvram_init();
 297
 298         /* Choose an idle loop */
 299         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 300                 vpa_init(boot_cpuid);
 301                 if (get_lppaca()->shared_proc) {
 302                         printk(KERN_DEBUG "Using shared processor idle loop\n");
 303                         ppc_md.power_save = pseries_shared_idle_sleep;
 304                 } else {
 305                         printk(KERN_DEBUG "Using dedicated idle loop\n");
 306                         ppc_md.power_save = pseries_dedicated_idle_sleep;
 307                 }
 308         } else {
 309                 printk(KERN_DEBUG "Using default idle loop\n");
 310         }
 311
 312         if (firmware_has_feature(FW_FEATURE_LPAR))
 313                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 314         else
 315                 ppc_md.enable_pmcs = power4_enable_pmcs;
 316 }
 317
 318 static int __init pSeries_init_panel(void)
 319 {
 320         /* Manually leave the kernel version on the panel. */
 321         ppc_md.progress("Linux ppc64\n", 0);
 322         ppc_md.progress(init_utsname()->version, 0);
 323
 324         return 0;
 325 }
 326 arch_initcall(pSeries_init_panel);
 327
 328 static int pseries_set_dabr(unsigned long dabr)
 329 {
 330         return plpar_hcall_norets(H_SET_DABR, dabr);
 331 }
 332
 333 static int pseries_set_xdabr(unsigned long dabr)
 334 {
 335         /* We want to catch accesses from kernel and userspace */
 336         return plpar_hcall_norets(H_SET_XDABR, dabr,
 337                         H_DABRX_KERNEL | H_DABRX_USER);
 338 }
 339
 340 #define CMO_CHARACTERISTICS_TOKEN 44
 341 #define CMO_MAXLENGTH 1026
 342
 343 /**
 344  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
 345  * handle that here. (Stolen from parse_system_parameter_string)
 346  */
 347 void pSeries_cmo_feature_init(void)
 348 {
 349         char *ptr, *key, *value, *end;
 350         int call_status;
 351         int page_order = IOMMU_PAGE_SHIFT;
 352
 353         pr_debug(" -> fw_cmo_feature_init()\n");
 354         spin_lock(&rtas_data_buf_lock);
 355         memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
 356         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 357                                 NULL,
 358                                 CMO_CHARACTERISTICS_TOKEN,
 359                                 __pa(rtas_data_buf),
 360                                 RTAS_DATA_BUF_SIZE);
 361
 362         if (call_status != 0) {
 363                 spin_unlock(&rtas_data_buf_lock);
 364                 pr_debug("CMO not available\n");
 365                 pr_debug(" <- fw_cmo_feature_init()\n");
 366                 return;
 367         }
 368
 369         end = rtas_data_buf + CMO_MAXLENGTH - 2;
 370         ptr = rtas_data_buf + 2;        /* step over strlen value */
 371         key = value = ptr;
 372
 373         while (*ptr && (ptr <= end)) {
 374                 /* Separate the key and value by replacing '=' with '\0' and
 375                  * point the value at the string after the '='
 376                  */
 377                 if (ptr[0] == '=') {
 378                         ptr[0] = '\0';
 379                         value = ptr + 1;
 380                 } else if (ptr[0] == '\0' || ptr[0] == ',') {
 381                         /* Terminate the string containing the key/value pair */
 382                         ptr[0] = '\0';
 383
 384                         if (key == value) {
 385                                 pr_debug("Malformed key/value pair\n");
 386                                 /* Never found a '=', end processing */
 387                                 break;
 388                         }
 389
 390                         if (0 == strcmp(key, "CMOPageSize"))
 391                                 page_order = simple_strtol(value, NULL, 10);
 392                         else if (0 == strcmp(key, "PrPSP"))
 393                                 CMO_PrPSP = simple_strtol(value, NULL, 10);
 394                         else if (0 == strcmp(key, "SecPSP"))
 395                                 CMO_SecPSP = simple_strtol(value, NULL, 10);
 396                         value = key = ptr + 1;
 397                 }
 398                 ptr++;
 399         }
 400
 401         /* Page size is returned as the power of 2 of the page size,
 402          * convert to the page size in bytes before returning
 403          */
 404         CMO_PageSize = 1 << page_order;
 405         pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
 406
 407         if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
 408                 pr_info("CMO enabled\n");
 409                 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
 410                          CMO_SecPSP);
 411                 powerpc_firmware_features |= FW_FEATURE_CMO;
 412         } else
 413                 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
 414                          CMO_SecPSP);
 415         spin_unlock(&rtas_data_buf_lock);
 416         pr_debug(" <- fw_cmo_feature_init()\n");
 417 }
 418
 419 /*
 420  * Early initialization.  Relocation is on but do not reference unbolted pages
 421  */
 422 static void __init pSeries_init_early(void)
 423 {
 424         pr_debug(" -> pSeries_init_early()\n");
 425
 426         if (firmware_has_feature(FW_FEATURE_LPAR))
 427                 find_udbg_vterm();
 428
 429         if (firmware_has_feature(FW_FEATURE_DABR))
 430                 ppc_md.set_dabr = pseries_set_dabr;
 431         else if (firmware_has_feature(FW_FEATURE_XDABR))
 432                 ppc_md.set_dabr = pseries_set_xdabr;
 433
 434         pSeries_cmo_feature_init();
 435         iommu_init_early_pSeries();
 436
 437         pr_debug(" <- pSeries_init_early()\n");
 438 }
 439
 440 /*
 441  * Called very early, MMU is off, device-tree isn't unflattened
 442  */
 443
 444 static int __init pSeries_probe_hypertas(unsigned long node,
 445                                          const char *uname, int depth,
 446                                          void *data)
 447 {
 448         const char *hypertas;
 449         unsigned long len;
 450
 451         if (depth != 1 ||
 452             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
 453                 return 0;
 454
 455         hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
 456         if (!hypertas)
 457                 return 1;
 458
 459         powerpc_firmware_features |= FW_FEATURE_LPAR;
 460         fw_feature_init(hypertas, len);
 461
 462         return 1;
 463 }
 464
 465 static int __init pSeries_probe(void)
 466 {
 467         unsigned long root = of_get_flat_dt_root();
 468         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
 469
 470         if (dtype == NULL)
 471                 return 0;
 472         if (strcmp(dtype, "chrp"))
 473                 return 0;
 474
 475         /* Cell blades firmware claims to be chrp while it's not. Until this
 476          * is fixed, we need to avoid those here.
 477          */
 478         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 479             of_flat_dt_is_compatible(root, "IBM,CBEA"))
 480                 return 0;
 481
 482         pr_debug("pSeries detected, looking for LPAR capability...\n");
 483
 484         /* Now try to figure out if we are running on LPAR */
 485         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
 486
 487         if (firmware_has_feature(FW_FEATURE_LPAR))
 488                 hpte_init_lpar();
 489         else
 490                 hpte_init_native();
 491
 492         pr_debug("Machine is%s LPAR !\n",
 493                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
 494
 495         return 1;
 496 }
 497
 498
 499 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 500
 501 static void pseries_dedicated_idle_sleep(void)
 502 {
 503         unsigned int cpu = smp_processor_id();
 504         unsigned long start_snooze;
 505         unsigned long in_purr, out_purr;
 506
 507         /*
 508          * Indicate to the HV that we are idle. Now would be
 509          * a good time to find other work to dispatch.
 510          */
 511         get_lppaca()->idle = 1;
 512         get_lppaca()->donate_dedicated_cpu = 1;
 513         in_purr = mfspr(SPRN_PURR);
 514
 515         /*
 516          * We come in with interrupts disabled, and need_resched()
 517          * has been checked recently.  If we should poll for a little
 518          * while, do so.
 519          */
 520         if (__get_cpu_var(smt_snooze_delay)) {
 521                 start_snooze = get_tb() +
 522                         __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
 523                 local_irq_enable();
 524                 set_thread_flag(TIF_POLLING_NRFLAG);
 525
 526                 while (get_tb() < start_snooze) {
 527                         if (need_resched() || cpu_is_offline(cpu))
 528                                 goto out;
 529                         ppc64_runlatch_off();
 530                         HMT_low();
 531                         HMT_very_low();
 532                 }
 533
 534                 HMT_medium();
 535                 clear_thread_flag(TIF_POLLING_NRFLAG);
 536                 smp_mb();
 537                 local_irq_disable();
 538                 if (need_resched() || cpu_is_offline(cpu))
 539                         goto out;
 540         }
 541
 542         cede_processor();
 543
 544 out:
 545         HMT_medium();
 546         out_purr = mfspr(SPRN_PURR);
 547         get_lppaca()->wait_state_cycles += out_purr - in_purr;
 548         get_lppaca()->donate_dedicated_cpu = 0;
 549         get_lppaca()->idle = 0;
 550 }
 551
 552 static void pseries_shared_idle_sleep(void)
 553 {
 554         /*
 555          * Indicate to the HV that we are idle. Now would be
 556          * a good time to find other work to dispatch.
 557          */
 558         get_lppaca()->idle = 1;
 559
 560         /*
 561          * Yield the processor to the hypervisor.  We return if
 562          * an external interrupt occurs (which are driven prior
 563          * to returning here) or if a prod occurs from another
 564          * processor. When returning here, external interrupts
 565          * are enabled.
 566          */
 567         cede_processor();
 568
 569         get_lppaca()->idle = 0;
 570 }
 571
 572 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 573 {
 574         if (firmware_has_feature(FW_FEATURE_LPAR))
 575                 return PCI_PROBE_DEVTREE;
 576         return PCI_PROBE_NORMAL;
 577 }
 578
 579 /**
 580  * pSeries_power_off - tell firmware about how to power off the system.
 581  *
 582  * This function calls either the power-off rtas token in normal cases
 583  * or the ibm,power-off-ups token (if present & requested) in case of
 584  * a power failure. If power-off token is used, power on will only be
 585  * possible with power button press. If ibm,power-off-ups token is used
 586  * it will allow auto poweron after power is restored.
 587  */
 588 static void pSeries_power_off(void)
 589 {
 590         int rc;
 591         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
 592
 593         if (rtas_flash_term_hook)
 594                 rtas_flash_term_hook(SYS_POWER_OFF);
 595
 596         if (rtas_poweron_auto == 0 ||
 597                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
 598                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
 599                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
 600         } else {
 601                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
 602                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
 603         }
 604         for (;;);
 605 }
 606
 607 #ifndef CONFIG_PCI
 608 void pSeries_final_fixup(void) { }
 609 #endif
 610
 611 define_machine(pseries) {
 612         .name                   = "pSeries",
 613         .probe                  = pSeries_probe,
 614         .setup_arch             = pSeries_setup_arch,
 615         .init_early             = pSeries_init_early,
 616         .show_cpuinfo           = pSeries_show_cpuinfo,
 617         .log_error              = pSeries_log_error,
 618         .pcibios_fixup          = pSeries_final_fixup,
 619         .pci_probe_mode         = pSeries_pci_probe_mode,
 620         .restart                = rtas_restart,
 621         .power_off              = pSeries_power_off,
 622         .halt                   = rtas_halt,
 623         .panic                  = rtas_os_term,
 624         .get_boot_time          = rtas_get_boot_time,
 625         .get_rtc_time           = rtas_get_rtc_time,
 626         .set_rtc_time           = rtas_set_rtc_time,
 627         .calibrate_decr         = generic_calibrate_decr,
 628         .progress               = rtas_progress,
 629         .system_reset_exception = pSeries_system_reset_exception,
 630         .machine_check_exception = pSeries_machine_check_exception,
 631 };