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/time.h>
  59 #include <asm/nvram.h>
  60 #include "xics.h"
  61 #include <asm/pmc.h>
  62 #include <asm/mpic.h>
  63 #include <asm/ppc-pci.h>
  64 #include <asm/i8259.h>
  65 #include <asm/udbg.h>
  66 #include <asm/smp.h>
  67 #include <asm/firmware.h>
  68 #include <asm/eeh.h>
  69
  70 #include "plpar_wrappers.h"
  71 #include "pseries.h"
  72
  73 #ifdef DEBUG
  74 #define DBG(fmt...) udbg_printf(fmt)
  75 #else
  76 #define DBG(fmt...)
  77 #endif
  78
  79 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  80
  81 static void pseries_shared_idle_sleep(void);
  82 static void pseries_dedicated_idle_sleep(void);
  83
  84 static struct device_node *pSeries_mpic_node;
  85
  86 static void pSeries_show_cpuinfo(struct seq_file *m)
  87 {
  88         struct device_node *root;
  89         const char *model = "";
  90
  91         root = of_find_node_by_path("/");
  92         if (root)
  93                 model = of_get_property(root, "model", NULL);
  94         seq_printf(m, "machine\t\t: CHRP %s\n", model);
  95         of_node_put(root);
  96 }
  97
  98 /* Initialize firmware assisted non-maskable interrupts if
  99  * the firmware supports this feature.
 100  */
 101 static void __init fwnmi_init(void)
 102 {
 103         unsigned long system_reset_addr, machine_check_addr;
 104
 105         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 106         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 107                 return;
 108
 109         /* If the kernel's not linked at zero we point the firmware at low
 110          * addresses anyway, and use a trampoline to get to the real code. */
 111         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
 112         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
 113
 114         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
 115                                 machine_check_addr))
 116                 fwnmi_active = 1;
 117 }
 118
 119 void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
 120 {
 121         unsigned int cascade_irq = i8259_irq();
 122         if (cascade_irq != NO_IRQ)
 123                 generic_handle_irq(cascade_irq);
 124         desc->chip->eoi(irq);
 125 }
 126
 127 static void __init xics_setup_8259_cascade(void)
 128 {
 129         struct device_node *np, *old, *found = NULL;
 130         int cascade, naddr;
 131         const u32 *addrp;
 132         unsigned long intack = 0;
 133
 134         for_each_node_by_type(np, "interrupt-controller")
 135                 if (of_device_is_compatible(np, "chrp,iic")) {
 136                         found = np;
 137                         break;
 138                 }
 139         if (found == NULL) {
 140                 printk(KERN_DEBUG "xics: no ISA interrupt controller\n");
 141                 return;
 142         }
 143         cascade = irq_of_parse_and_map(found, 0);
 144         if (cascade == NO_IRQ) {
 145                 printk(KERN_ERR "xics: failed to map cascade interrupt");
 146                 return;
 147         }
 148         pr_debug("xics: 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 "xics: 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, *old, *cascade = NULL;
 175         const unsigned int *addrp;
 176         unsigned long intack = 0;
 177         const unsigned int *opprop;
 178         unsigned long openpic_addr = 0;
 179         unsigned int cascade_irq;
 180         int naddr, n, i, opplen;
 181         struct mpic *mpic;
 182
 183         np = of_find_node_by_path("/");
 184         naddr = of_n_addr_cells(np);
 185         opprop = of_get_property(np, "platform-open-pic", &opplen);
 186         if (opprop != 0) {
 187                 openpic_addr = of_read_number(opprop, naddr);
 188                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 189         }
 190         of_node_put(np);
 191
 192         BUG_ON(openpic_addr == 0);
 193
 194         /* Setup the openpic driver */
 195         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
 196                           MPIC_PRIMARY,
 197                           16, 250, /* isu size, irq count */
 198                           " MPIC     ");
 199         BUG_ON(mpic == NULL);
 200
 201         /* Add ISUs */
 202         opplen /= sizeof(u32);
 203         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 204                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
 205                 mpic_assign_isu(mpic, n, isuaddr);
 206         }
 207
 208         /* All ISUs are setup, complete initialization */
 209         mpic_init(mpic);
 210
 211         /* Look for cascade */
 212         for_each_node_by_type(np, "interrupt-controller")
 213                 if (of_device_is_compatible(np, "chrp,iic")) {
 214                         cascade = np;
 215                         break;
 216                 }
 217         if (cascade == NULL)
 218                 return;
 219
 220         cascade_irq = irq_of_parse_and_map(cascade, 0);
 221         if (cascade_irq == NO_IRQ) {
 222                 printk(KERN_ERR "mpic: failed to map cascade interrupt");
 223                 return;
 224         }
 225
 226         /* Check ACK type */
 227         for (old = of_node_get(cascade); old != NULL ; old = np) {
 228                 np = of_get_parent(old);
 229                 of_node_put(old);
 230                 if (np == NULL)
 231                         break;
 232                 if (strcmp(np->name, "pci") != 0)
 233                         continue;
 234                 addrp = of_get_property(np, "8259-interrupt-acknowledge",
 235                                             NULL);
 236                 if (addrp == NULL)
 237                         continue;
 238                 naddr = of_n_addr_cells(np);
 239                 intack = addrp[naddr-1];
 240                 if (naddr > 1)
 241                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
 242         }
 243         if (intack)
 244                 printk(KERN_DEBUG "mpic: PCI 8259 intack at 0x%016lx\n",
 245                        intack);
 246         i8259_init(cascade, intack);
 247         of_node_put(cascade);
 248         set_irq_chained_handler(cascade_irq, pseries_8259_cascade);
 249 }
 250
 251 static void __init pseries_xics_init_IRQ(void)
 252 {
 253         xics_init_IRQ();
 254         xics_setup_8259_cascade();
 255 }
 256
 257 static void pseries_lpar_enable_pmcs(void)
 258 {
 259         unsigned long set, reset;
 260
 261         set = 1UL << 63;
 262         reset = 0;
 263         plpar_hcall_norets(H_PERFMON, set, reset);
 264
 265         /* instruct hypervisor to maintain PMCs */
 266         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 267                 get_lppaca()->pmcregs_in_use = 1;
 268 }
 269
 270 static void __init pseries_discover_pic(void)
 271 {
 272         struct device_node *np;
 273         const char *typep;
 274
 275         for (np = NULL; (np = of_find_node_by_name(np,
 276                                                    "interrupt-controller"));) {
 277                 typep = of_get_property(np, "compatible", NULL);
 278                 if (strstr(typep, "open-pic")) {
 279                         pSeries_mpic_node = of_node_get(np);
 280                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
 281                         ppc_md.get_irq        = mpic_get_irq;
 282                         setup_kexec_cpu_down_mpic();
 283                         smp_init_pseries_mpic();
 284                         return;
 285                 } else if (strstr(typep, "ppc-xicp")) {
 286                         ppc_md.init_IRQ       = pseries_xics_init_IRQ;
 287                         setup_kexec_cpu_down_xics();
 288                         smp_init_pseries_xics();
 289                         return;
 290                 }
 291         }
 292         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
 293                " interrupt-controller\n");
 294 }
 295
 296 static void __init pSeries_setup_arch(void)
 297 {
 298         /* Discover PIC type and setup ppc_md accordingly */
 299         pseries_discover_pic();
 300
 301         /* openpic global configuration register (64-bit format). */
 302         /* openpic Interrupt Source Unit pointer (64-bit format). */
 303         /* python0 facility area (mmio) (64-bit format) REAL address. */
 304
 305         /* init to some ~sane value until calibrate_delay() runs */
 306         loops_per_jiffy = 50000000;
 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(init_utsname()->version, 0);
 342
 343         return 0;
 344 }
 345 arch_initcall(pSeries_init_panel);
 346
 347 static int pseries_set_dabr(unsigned long dabr)
 348 {
 349         return plpar_hcall_norets(H_SET_DABR, dabr);
 350 }
 351
 352 static int pseries_set_xdabr(unsigned long dabr)
 353 {
 354         /* We want to catch accesses from kernel and userspace */
 355         return plpar_hcall_norets(H_SET_XDABR, dabr,
 356                         H_DABRX_KERNEL | H_DABRX_USER);
 357 }
 358
 359 /*
 360  * Early initialization.  Relocation is on but do not reference unbolted pages
 361  */
 362 static void __init pSeries_init_early(void)
 363 {
 364         DBG(" -> pSeries_init_early()\n");
 365
 366         if (firmware_has_feature(FW_FEATURE_LPAR))
 367                 find_udbg_vterm();
 368
 369         if (firmware_has_feature(FW_FEATURE_DABR))
 370                 ppc_md.set_dabr = pseries_set_dabr;
 371         else if (firmware_has_feature(FW_FEATURE_XDABR))
 372                 ppc_md.set_dabr = pseries_set_xdabr;
 373
 374         iommu_init_early_pSeries();
 375
 376         DBG(" <- pSeries_init_early()\n");
 377 }
 378
 379 /*
 380  * Called very early, MMU is off, device-tree isn't unflattened
 381  */
 382
 383 static int __init pSeries_probe_hypertas(unsigned long node,
 384                                          const char *uname, int depth,
 385                                          void *data)
 386 {
 387         const char *hypertas;
 388         unsigned long len;
 389
 390         if (depth != 1 ||
 391             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
 392                 return 0;
 393
 394         hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
 395         if (!hypertas)
 396                 return 1;
 397
 398         powerpc_firmware_features |= FW_FEATURE_LPAR;
 399         fw_feature_init(hypertas, len);
 400
 401         return 1;
 402 }
 403
 404 static int __init pSeries_probe(void)
 405 {
 406         unsigned long root = of_get_flat_dt_root();
 407         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
 408
 409         if (dtype == NULL)
 410                 return 0;
 411         if (strcmp(dtype, "chrp"))
 412                 return 0;
 413
 414         /* Cell blades firmware claims to be chrp while it's not. Until this
 415          * is fixed, we need to avoid those here.
 416          */
 417         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 418             of_flat_dt_is_compatible(root, "IBM,CBEA"))
 419                 return 0;
 420
 421         DBG("pSeries detected, looking for LPAR capability...\n");
 422
 423         /* Now try to figure out if we are running on LPAR */
 424         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
 425
 426         if (firmware_has_feature(FW_FEATURE_LPAR))
 427                 hpte_init_lpar();
 428         else
 429                 hpte_init_native();
 430
 431         DBG("Machine is%s LPAR !\n",
 432             (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
 433
 434         return 1;
 435 }
 436
 437
 438 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 439
 440 static void pseries_dedicated_idle_sleep(void)
 441 {
 442         unsigned int cpu = smp_processor_id();
 443         unsigned long start_snooze;
 444         unsigned long in_purr, out_purr;
 445
 446         /*
 447          * Indicate to the HV that we are idle. Now would be
 448          * a good time to find other work to dispatch.
 449          */
 450         get_lppaca()->idle = 1;
 451         get_lppaca()->donate_dedicated_cpu = 1;
 452         in_purr = mfspr(SPRN_PURR);
 453
 454         /*
 455          * We come in with interrupts disabled, and need_resched()
 456          * has been checked recently.  If we should poll for a little
 457          * while, do so.
 458          */
 459         if (__get_cpu_var(smt_snooze_delay)) {
 460                 start_snooze = get_tb() +
 461                         __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
 462                 local_irq_enable();
 463                 set_thread_flag(TIF_POLLING_NRFLAG);
 464
 465                 while (get_tb() < start_snooze) {
 466                         if (need_resched() || cpu_is_offline(cpu))
 467                                 goto out;
 468                         ppc64_runlatch_off();
 469                         HMT_low();
 470                         HMT_very_low();
 471                 }
 472
 473                 HMT_medium();
 474                 clear_thread_flag(TIF_POLLING_NRFLAG);
 475                 smp_mb();
 476                 local_irq_disable();
 477                 if (need_resched() || cpu_is_offline(cpu))
 478                         goto out;
 479         }
 480
 481         cede_processor();
 482
 483 out:
 484         HMT_medium();
 485         out_purr = mfspr(SPRN_PURR);
 486         get_lppaca()->wait_state_cycles += out_purr - in_purr;
 487         get_lppaca()->donate_dedicated_cpu = 0;
 488         get_lppaca()->idle = 0;
 489 }
 490
 491 static void pseries_shared_idle_sleep(void)
 492 {
 493         /*
 494          * Indicate to the HV that we are idle. Now would be
 495          * a good time to find other work to dispatch.
 496          */
 497         get_lppaca()->idle = 1;
 498
 499         /*
 500          * Yield the processor to the hypervisor.  We return if
 501          * an external interrupt occurs (which are driven prior
 502          * to returning here) or if a prod occurs from another
 503          * processor. When returning here, external interrupts
 504          * are enabled.
 505          */
 506         cede_processor();
 507
 508         get_lppaca()->idle = 0;
 509 }
 510
 511 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 512 {
 513         if (firmware_has_feature(FW_FEATURE_LPAR))
 514                 return PCI_PROBE_DEVTREE;
 515         return PCI_PROBE_NORMAL;
 516 }
 517
 518 /**
 519  * pSeries_power_off - tell firmware about how to power off the system.
 520  *
 521  * This function calls either the power-off rtas token in normal cases
 522  * or the ibm,power-off-ups token (if present & requested) in case of
 523  * a power failure. If power-off token is used, power on will only be
 524  * possible with power button press. If ibm,power-off-ups token is used
 525  * it will allow auto poweron after power is restored.
 526  */
 527 void pSeries_power_off(void)
 528 {
 529         int rc;
 530         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
 531
 532         if (rtas_flash_term_hook)
 533                 rtas_flash_term_hook(SYS_POWER_OFF);
 534
 535         if (rtas_poweron_auto == 0 ||
 536                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
 537                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
 538                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
 539         } else {
 540                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
 541                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
 542         }
 543         for (;;);
 544 }
 545
 546 #ifndef CONFIG_PCI
 547 void pSeries_final_fixup(void) { }
 548 #endif
 549
 550 define_machine(pseries) {
 551         .name                   = "pSeries",
 552         .probe                  = pSeries_probe,
 553         .setup_arch             = pSeries_setup_arch,
 554         .init_early             = pSeries_init_early,
 555         .show_cpuinfo           = pSeries_show_cpuinfo,
 556         .log_error              = pSeries_log_error,
 557         .pcibios_fixup          = pSeries_final_fixup,
 558         .pci_probe_mode         = pSeries_pci_probe_mode,
 559         .restart                = rtas_restart,
 560         .power_off              = pSeries_power_off,
 561         .halt                   = rtas_halt,
 562         .panic                  = rtas_os_term,
 563         .get_boot_time          = rtas_get_boot_time,
 564         .get_rtc_time           = rtas_get_rtc_time,
 565         .set_rtc_time           = rtas_set_rtc_time,
 566         .calibrate_decr         = generic_calibrate_decr,
 567         .progress               = rtas_progress,
 568         .system_reset_exception = pSeries_system_reset_exception,
 569         .machine_check_exception = pSeries_machine_check_exception,
 570 };