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