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/slab.h>
  27 #include <linux/user.h>
  28 #include <linux/tty.h>
  29 #include <linux/major.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/reboot.h>
  32 #include <linux/init.h>
  33 #include <linux/ioport.h>
  34 #include <linux/console.h>
  35 #include <linux/pci.h>
  36 #include <linux/utsname.h>
  37 #include <linux/adb.h>
  38 #include <linux/module.h>
  39 #include <linux/delay.h>
  40 #include <linux/irq.h>
  41 #include <linux/seq_file.h>
  42 #include <linux/root_dev.h>
  43
  44 #include <asm/mmu.h>
  45 #include <asm/processor.h>
  46 #include <asm/io.h>
  47 #include <asm/pgtable.h>
  48 #include <asm/prom.h>
  49 #include <asm/rtas.h>
  50 #include <asm/pci-bridge.h>
  51 #include <asm/iommu.h>
  52 #include <asm/dma.h>
  53 #include <asm/machdep.h>
  54 #include <asm/irq.h>
  55 #include <asm/time.h>
  56 #include <asm/nvram.h>
  57 #include "xics.h"
  58 #include <asm/pmc.h>
  59 #include <asm/mpic.h>
  60 #include <asm/ppc-pci.h>
  61 #include <asm/i8259.h>
  62 #include <asm/udbg.h>
  63 #include <asm/smp.h>
  64 #include <asm/firmware.h>
  65 #include <asm/eeh.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         /* instruct hypervisor to maintain PMCs */
 227         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 228                 get_lppaca()->pmcregs_in_use = 1;
 229 }
 230
 231 static void __init pseries_discover_pic(void)
 232 {
 233         struct device_node *np;
 234         const char *typep;
 235
 236         for (np = NULL; (np = of_find_node_by_name(np,
 237                                                    "interrupt-controller"));) {
 238                 typep = of_get_property(np, "compatible", NULL);
 239                 if (strstr(typep, "open-pic")) {
 240                         pSeries_mpic_node = of_node_get(np);
 241                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
 242                         ppc_md.get_irq        = mpic_get_irq;
 243                         setup_kexec_cpu_down_mpic();
 244                         smp_init_pseries_mpic();
 245                         return;
 246                 } else if (strstr(typep, "ppc-xicp")) {
 247                         ppc_md.init_IRQ       = pseries_xics_init_IRQ;
 248                         setup_kexec_cpu_down_xics();
 249                         smp_init_pseries_xics();
 250                         return;
 251                 }
 252         }
 253         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
 254                " interrupt-controller\n");
 255 }
 256
 257 static void __init pSeries_setup_arch(void)
 258 {
 259         /* Discover PIC type and setup ppc_md accordingly */
 260         pseries_discover_pic();
 261
 262         /* openpic global configuration register (64-bit format). */
 263         /* openpic Interrupt Source Unit pointer (64-bit format). */
 264         /* python0 facility area (mmio) (64-bit format) REAL address. */
 265
 266         /* init to some ~sane value until calibrate_delay() runs */
 267         loops_per_jiffy = 50000000;
 268
 269         fwnmi_init();
 270
 271         /* Find and initialize PCI host bridges */
 272         init_pci_config_tokens();
 273         find_and_init_phbs();
 274         eeh_init();
 275
 276         pSeries_nvram_init();
 277
 278         /* Choose an idle loop */
 279         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 280                 vpa_init(boot_cpuid);
 281                 if (get_lppaca()->shared_proc) {
 282                         printk(KERN_DEBUG "Using shared processor idle loop\n");
 283                         ppc_md.power_save = pseries_shared_idle_sleep;
 284                 } else {
 285                         printk(KERN_DEBUG "Using dedicated idle loop\n");
 286                         ppc_md.power_save = pseries_dedicated_idle_sleep;
 287                 }
 288         } else {
 289                 printk(KERN_DEBUG "Using default idle loop\n");
 290         }
 291
 292         if (firmware_has_feature(FW_FEATURE_LPAR))
 293                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 294         else
 295                 ppc_md.enable_pmcs = power4_enable_pmcs;
 296 }
 297
 298 static int __init pSeries_init_panel(void)
 299 {
 300         /* Manually leave the kernel version on the panel. */
 301         ppc_md.progress("Linux ppc64\n", 0);
 302         ppc_md.progress(init_utsname()->version, 0);
 303
 304         return 0;
 305 }
 306 arch_initcall(pSeries_init_panel);
 307
 308 static int pseries_set_dabr(unsigned long dabr)
 309 {
 310         return plpar_hcall_norets(H_SET_DABR, dabr);
 311 }
 312
 313 static int pseries_set_xdabr(unsigned long dabr)
 314 {
 315         /* We want to catch accesses from kernel and userspace */
 316         return plpar_hcall_norets(H_SET_XDABR, dabr,
 317                         H_DABRX_KERNEL | H_DABRX_USER);
 318 }
 319
 320 #define CMO_CHARACTERISTICS_TOKEN 44
 321 #define CMO_MAXLENGTH 1026
 322
 323 /**
 324  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
 325  * handle that here. (Stolen from parse_system_parameter_string)
 326  */
 327 void pSeries_cmo_feature_init(void)
 328 {
 329         char *ptr, *key, *value, *end;
 330         int call_status;
 331         int page_order = IOMMU_PAGE_SHIFT;
 332
 333         pr_debug(" -> fw_cmo_feature_init()\n");
 334         spin_lock(&rtas_data_buf_lock);
 335         memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
 336         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 337                                 NULL,
 338                                 CMO_CHARACTERISTICS_TOKEN,
 339                                 __pa(rtas_data_buf),
 340                                 RTAS_DATA_BUF_SIZE);
 341
 342         if (call_status != 0) {
 343                 spin_unlock(&rtas_data_buf_lock);
 344                 pr_debug("CMO not available\n");
 345                 pr_debug(" <- fw_cmo_feature_init()\n");
 346                 return;
 347         }
 348
 349         end = rtas_data_buf + CMO_MAXLENGTH - 2;
 350         ptr = rtas_data_buf + 2;        /* step over strlen value */
 351         key = value = ptr;
 352
 353         while (*ptr && (ptr <= end)) {
 354                 /* Separate the key and value by replacing '=' with '\0' and
 355                  * point the value at the string after the '='
 356                  */
 357                 if (ptr[0] == '=') {
 358                         ptr[0] = '\0';
 359                         value = ptr + 1;
 360                 } else if (ptr[0] == '\0' || ptr[0] == ',') {
 361                         /* Terminate the string containing the key/value pair */
 362                         ptr[0] = '\0';
 363
 364                         if (key == value) {
 365                                 pr_debug("Malformed key/value pair\n");
 366                                 /* Never found a '=', end processing */
 367                                 break;
 368                         }
 369
 370                         if (0 == strcmp(key, "CMOPageSize"))
 371                                 page_order = simple_strtol(value, NULL, 10);
 372                         else if (0 == strcmp(key, "PrPSP"))
 373                                 CMO_PrPSP = simple_strtol(value, NULL, 10);
 374                         else if (0 == strcmp(key, "SecPSP"))
 375                                 CMO_SecPSP = simple_strtol(value, NULL, 10);
 376                         value = key = ptr + 1;
 377                 }
 378                 ptr++;
 379         }
 380
 381         /* Page size is returned as the power of 2 of the page size,
 382          * convert to the page size in bytes before returning
 383          */
 384         CMO_PageSize = 1 << page_order;
 385         pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
 386
 387         if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
 388                 pr_info("CMO enabled\n");
 389                 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
 390                          CMO_SecPSP);
 391                 powerpc_firmware_features |= FW_FEATURE_CMO;
 392         } else
 393                 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
 394                          CMO_SecPSP);
 395         spin_unlock(&rtas_data_buf_lock);
 396         pr_debug(" <- fw_cmo_feature_init()\n");
 397 }
 398
 399 /*
 400  * Early initialization.  Relocation is on but do not reference unbolted pages
 401  */
 402 static void __init pSeries_init_early(void)
 403 {
 404         pr_debug(" -> pSeries_init_early()\n");
 405
 406         if (firmware_has_feature(FW_FEATURE_LPAR))
 407                 find_udbg_vterm();
 408
 409         if (firmware_has_feature(FW_FEATURE_DABR))
 410                 ppc_md.set_dabr = pseries_set_dabr;
 411         else if (firmware_has_feature(FW_FEATURE_XDABR))
 412                 ppc_md.set_dabr = pseries_set_xdabr;
 413
 414         pSeries_cmo_feature_init();
 415         iommu_init_early_pSeries();
 416
 417         pr_debug(" <- pSeries_init_early()\n");
 418 }
 419
 420 /*
 421  * Called very early, MMU is off, device-tree isn't unflattened
 422  */
 423
 424 static int __init pSeries_probe_hypertas(unsigned long node,
 425                                          const char *uname, int depth,
 426                                          void *data)
 427 {
 428         const char *hypertas;
 429         unsigned long len;
 430
 431         if (depth != 1 ||
 432             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
 433                 return 0;
 434
 435         hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
 436         if (!hypertas)
 437                 return 1;
 438
 439         powerpc_firmware_features |= FW_FEATURE_LPAR;
 440         fw_feature_init(hypertas, len);
 441
 442         return 1;
 443 }
 444
 445 static int __init pSeries_probe(void)
 446 {
 447         unsigned long root = of_get_flat_dt_root();
 448         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
 449
 450         if (dtype == NULL)
 451                 return 0;
 452         if (strcmp(dtype, "chrp"))
 453                 return 0;
 454
 455         /* Cell blades firmware claims to be chrp while it's not. Until this
 456          * is fixed, we need to avoid those here.
 457          */
 458         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 459             of_flat_dt_is_compatible(root, "IBM,CBEA"))
 460                 return 0;
 461
 462         pr_debug("pSeries detected, looking for LPAR capability...\n");
 463
 464         /* Now try to figure out if we are running on LPAR */
 465         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
 466
 467         if (firmware_has_feature(FW_FEATURE_LPAR))
 468                 hpte_init_lpar();
 469         else
 470                 hpte_init_native();
 471
 472         pr_debug("Machine is%s LPAR !\n",
 473                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
 474
 475         return 1;
 476 }
 477
 478
 479 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 480
 481 static void pseries_dedicated_idle_sleep(void)
 482 {
 483         unsigned int cpu = smp_processor_id();
 484         unsigned long start_snooze;
 485         unsigned long in_purr, out_purr;
 486
 487         /*
 488          * Indicate to the HV that we are idle. Now would be
 489          * a good time to find other work to dispatch.
 490          */
 491         get_lppaca()->idle = 1;
 492         get_lppaca()->donate_dedicated_cpu = 1;
 493         in_purr = mfspr(SPRN_PURR);
 494
 495         /*
 496          * We come in with interrupts disabled, and need_resched()
 497          * has been checked recently.  If we should poll for a little
 498          * while, do so.
 499          */
 500         if (__get_cpu_var(smt_snooze_delay)) {
 501                 start_snooze = get_tb() +
 502                         __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
 503                 local_irq_enable();
 504                 set_thread_flag(TIF_POLLING_NRFLAG);
 505
 506                 while (get_tb() < start_snooze) {
 507                         if (need_resched() || cpu_is_offline(cpu))
 508                                 goto out;
 509                         ppc64_runlatch_off();
 510                         HMT_low();
 511                         HMT_very_low();
 512                 }
 513
 514                 HMT_medium();
 515                 clear_thread_flag(TIF_POLLING_NRFLAG);
 516                 smp_mb();
 517                 local_irq_disable();
 518                 if (need_resched() || cpu_is_offline(cpu))
 519                         goto out;
 520         }
 521
 522         cede_processor();
 523
 524 out:
 525         HMT_medium();
 526         out_purr = mfspr(SPRN_PURR);
 527         get_lppaca()->wait_state_cycles += out_purr - in_purr;
 528         get_lppaca()->donate_dedicated_cpu = 0;
 529         get_lppaca()->idle = 0;
 530 }
 531
 532 static void pseries_shared_idle_sleep(void)
 533 {
 534         /*
 535          * Indicate to the HV that we are idle. Now would be
 536          * a good time to find other work to dispatch.
 537          */
 538         get_lppaca()->idle = 1;
 539
 540         /*
 541          * Yield the processor to the hypervisor.  We return if
 542          * an external interrupt occurs (which are driven prior
 543          * to returning here) or if a prod occurs from another
 544          * processor. When returning here, external interrupts
 545          * are enabled.
 546          */
 547         cede_processor();
 548
 549         get_lppaca()->idle = 0;
 550 }
 551
 552 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 553 {
 554         if (firmware_has_feature(FW_FEATURE_LPAR))
 555                 return PCI_PROBE_DEVTREE;
 556         return PCI_PROBE_NORMAL;
 557 }
 558
 559 /**
 560  * pSeries_power_off - tell firmware about how to power off the system.
 561  *
 562  * This function calls either the power-off rtas token in normal cases
 563  * or the ibm,power-off-ups token (if present & requested) in case of
 564  * a power failure. If power-off token is used, power on will only be
 565  * possible with power button press. If ibm,power-off-ups token is used
 566  * it will allow auto poweron after power is restored.
 567  */
 568 static void pSeries_power_off(void)
 569 {
 570         int rc;
 571         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
 572
 573         if (rtas_flash_term_hook)
 574                 rtas_flash_term_hook(SYS_POWER_OFF);
 575
 576         if (rtas_poweron_auto == 0 ||
 577                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
 578                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
 579                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
 580         } else {
 581                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
 582                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
 583         }
 584         for (;;);
 585 }
 586
 587 #ifndef CONFIG_PCI
 588 void pSeries_final_fixup(void) { }
 589 #endif
 590
 591 define_machine(pseries) {
 592         .name                   = "pSeries",
 593         .probe                  = pSeries_probe,
 594         .setup_arch             = pSeries_setup_arch,
 595         .init_early             = pSeries_init_early,
 596         .show_cpuinfo           = pSeries_show_cpuinfo,
 597         .log_error              = pSeries_log_error,
 598         .pcibios_fixup          = pSeries_final_fixup,
 599         .pci_probe_mode         = pSeries_pci_probe_mode,
 600         .restart                = rtas_restart,
 601         .power_off              = pSeries_power_off,
 602         .halt                   = rtas_halt,
 603         .panic                  = rtas_os_term,
 604         .get_boot_time          = rtas_get_boot_time,
 605         .get_rtc_time           = rtas_get_rtc_time,
 606         .set_rtc_time           = rtas_set_rtc_time,
 607         .calibrate_decr         = generic_calibrate_decr,
 608         .progress               = rtas_progress,
 609         .system_reset_exception = pSeries_system_reset_exception,
 610         .machine_check_exception = pSeries_machine_check_exception,
 611 };