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/config.h>
  22 #include <linux/cpu.h>
  23 #include <linux/errno.h>
  24 #include <linux/sched.h>
  25 #include <linux/kernel.h>
  26 #include <linux/mm.h>
  27 #include <linux/stddef.h>
  28 #include <linux/unistd.h>
  29 #include <linux/slab.h>
  30 #include <linux/user.h>
  31 #include <linux/a.out.h>
  32 #include <linux/tty.h>
  33 #include <linux/major.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/reboot.h>
  36 #include <linux/init.h>
  37 #include <linux/ioport.h>
  38 #include <linux/console.h>
  39 #include <linux/pci.h>
  40 #include <linux/utsname.h>
  41 #include <linux/adb.h>
  42 #include <linux/module.h>
  43 #include <linux/delay.h>
  44 #include <linux/irq.h>
  45 #include <linux/seq_file.h>
  46 #include <linux/root_dev.h>
  47
  48 #include <asm/mmu.h>
  49 #include <asm/processor.h>
  50 #include <asm/io.h>
  51 #include <asm/pgtable.h>
  52 #include <asm/prom.h>
  53 #include <asm/rtas.h>
  54 #include <asm/pci-bridge.h>
  55 #include <asm/iommu.h>
  56 #include <asm/dma.h>
  57 #include <asm/machdep.h>
  58 #include <asm/irq.h>
  59 #include <asm/kexec.h>
  60 #include <asm/time.h>
  61 #include <asm/nvram.h>
  62 #include "xics.h"
  63 #include <asm/firmware.h>
  64 #include <asm/pmc.h>
  65 #include <asm/mpic.h>
  66 #include <asm/ppc-pci.h>
  67 #include <asm/i8259.h>
  68 #include <asm/udbg.h>
  69 #include <asm/smp.h>
  70
  71 #include "plpar_wrappers.h"
  72
  73 #ifdef DEBUG
  74 #define DBG(fmt...) udbg_printf(fmt)
  75 #else
  76 #define DBG(fmt...)
  77 #endif
  78
  79 extern void find_udbg_vterm(void);
  80
  81 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  82
  83 extern void pSeries_system_reset_exception(struct pt_regs *regs);
  84 extern int pSeries_machine_check_exception(struct pt_regs *regs);
  85
  86 static void pseries_shared_idle(void);
  87 static void pseries_dedicated_idle(void);
  88
  89 struct mpic *pSeries_mpic;
  90
  91 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 static void __init pSeries_init_mpic(void)
 125 {
 126         unsigned int *addrp;
 127         struct device_node *np;
 128         unsigned long intack = 0;
 129
 130         /* All ISUs are setup, complete initialization */
 131         mpic_init(pSeries_mpic);
 132
 133         /* Check what kind of cascade ACK we have */
 134         if (!(np = of_find_node_by_name(NULL, "pci"))
 135             || !(addrp = (unsigned int *)
 136                  get_property(np, "8259-interrupt-acknowledge", NULL)))
 137                 printk(KERN_ERR "Cannot find pci to get ack address\n");
 138         else
 139                 intack = addrp[prom_n_addr_cells(np)-1];
 140         of_node_put(np);
 141
 142         /* Setup the legacy interrupts & controller */
 143         i8259_init(intack, 0);
 144
 145         /* Hook cascade to mpic */
 146         mpic_setup_cascade(NUM_ISA_INTERRUPTS, i8259_irq_cascade, NULL);
 147 }
 148
 149 static void __init pSeries_setup_mpic(void)
 150 {
 151         unsigned int *opprop;
 152         unsigned long openpic_addr = 0;
 153         unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
 154         struct device_node *root;
 155         int irq_count;
 156
 157         /* Find the Open PIC if present */
 158         root = of_find_node_by_path("/");
 159         opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
 160         if (opprop != 0) {
 161                 int n = prom_n_addr_cells(root);
 162
 163                 for (openpic_addr = 0; n > 0; --n)
 164                         openpic_addr = (openpic_addr << 32) + *opprop++;
 165                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 166         }
 167         of_node_put(root);
 168
 169         BUG_ON(openpic_addr == 0);
 170
 171         /* Get the sense values from OF */
 172         prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
 173
 174         /* Setup the openpic driver */
 175         irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
 176         pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
 177                                   16, 16, irq_count, /* isu size, irq offset, irq count */
 178                                   NR_IRQS - 4, /* ipi offset */
 179                                   senses, irq_count, /* sense & sense size */
 180                                   " MPIC     ");
 181 }
 182
 183 static void pseries_lpar_enable_pmcs(void)
 184 {
 185         unsigned long set, reset;
 186
 187         power4_enable_pmcs();
 188
 189         set = 1UL << 63;
 190         reset = 0;
 191         plpar_hcall_norets(H_PERFMON, set, reset);
 192
 193         /* instruct hypervisor to maintain PMCs */
 194         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 195                 get_paca()->lppaca.pmcregs_in_use = 1;
 196 }
 197
 198 static void __init pSeries_setup_arch(void)
 199 {
 200         /* Fixup ppc_md depending on the type of interrupt controller */
 201         if (ppc64_interrupt_controller == IC_OPEN_PIC) {
 202                 ppc_md.init_IRQ       = pSeries_init_mpic;
 203                 ppc_md.get_irq        = mpic_get_irq;
 204                 /* Allocate the mpic now, so that find_and_init_phbs() can
 205                  * fill the ISUs */
 206                 pSeries_setup_mpic();
 207         } else {
 208                 ppc_md.init_IRQ       = xics_init_IRQ;
 209                 ppc_md.get_irq        = xics_get_irq;
 210         }
 211
 212 #ifdef CONFIG_SMP
 213         smp_init_pSeries();
 214 #endif
 215         /* openpic global configuration register (64-bit format). */
 216         /* openpic Interrupt Source Unit pointer (64-bit format). */
 217         /* python0 facility area (mmio) (64-bit format) REAL address. */
 218
 219         /* init to some ~sane value until calibrate_delay() runs */
 220         loops_per_jiffy = 50000000;
 221
 222         if (ROOT_DEV == 0) {
 223                 printk("No ramdisk, default root is /dev/sda2\n");
 224                 ROOT_DEV = Root_SDA2;
 225         }
 226
 227         fwnmi_init();
 228
 229         /* Find and initialize PCI host bridges */
 230         init_pci_config_tokens();
 231         find_and_init_phbs();
 232         eeh_init();
 233
 234         pSeries_nvram_init();
 235
 236         /* Choose an idle loop */
 237         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 238                 vpa_init(boot_cpuid);
 239                 if (get_paca()->lppaca.shared_proc) {
 240                         printk(KERN_INFO "Using shared processor idle loop\n");
 241                         ppc_md.idle_loop = pseries_shared_idle;
 242                 } else {
 243                         printk(KERN_INFO "Using dedicated idle loop\n");
 244                         ppc_md.idle_loop = pseries_dedicated_idle;
 245                 }
 246         } else {
 247                 printk(KERN_INFO "Using default idle loop\n");
 248                 ppc_md.idle_loop = default_idle;
 249         }
 250
 251         if (platform_is_lpar())
 252                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 253         else
 254                 ppc_md.enable_pmcs = power4_enable_pmcs;
 255 }
 256
 257 static int __init pSeries_init_panel(void)
 258 {
 259         /* Manually leave the kernel version on the panel. */
 260         ppc_md.progress("Linux ppc64\n", 0);
 261         ppc_md.progress(system_utsname.version, 0);
 262
 263         return 0;
 264 }
 265 arch_initcall(pSeries_init_panel);
 266
 267
 268 /* Build up the ppc64_firmware_features bitmask field
 269  * using contents of device-tree/ibm,hypertas-functions.
 270  * Ultimately this functionality may be moved into prom.c prom_init().
 271  */
 272 static void __init fw_feature_init(void)
 273 {
 274         struct device_node * dn;
 275         char * hypertas;
 276         unsigned int len;
 277
 278         DBG(" -> fw_feature_init()\n");
 279
 280         ppc64_firmware_features = 0;
 281         dn = of_find_node_by_path("/rtas");
 282         if (dn == NULL) {
 283                 printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n");
 284                 goto no_rtas;
 285         }
 286
 287         hypertas = get_property(dn, "ibm,hypertas-functions", &len);
 288         if (hypertas) {
 289                 while (len > 0){
 290                         int i, hypertas_len;
 291                         /* check value against table of strings */
 292                         for(i=0; i < FIRMWARE_MAX_FEATURES ;i++) {
 293                                 if ((firmware_features_table[i].name) &&
 294                                     (strcmp(firmware_features_table[i].name,hypertas))==0) {
 295                                         /* we have a match */
 296                                         ppc64_firmware_features |=
 297                                                 (firmware_features_table[i].val);
 298                                         break;
 299                                 }
 300                         }
 301                         hypertas_len = strlen(hypertas);
 302                         len -= hypertas_len +1;
 303                         hypertas+= hypertas_len +1;
 304                 }
 305         }
 306
 307         of_node_put(dn);
 308 no_rtas:
 309
 310         DBG(" <- fw_feature_init()\n");
 311 }
 312
 313
 314 static  void __init pSeries_discover_pic(void)
 315 {
 316         struct device_node *np;
 317         char *typep;
 318
 319         /*
 320          * Setup interrupt mapping options that are needed for finish_device_tree
 321          * to properly parse the OF interrupt tree & do the virtual irq mapping
 322          */
 323         __irq_offset_value = NUM_ISA_INTERRUPTS;
 324         ppc64_interrupt_controller = IC_INVALID;
 325         for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
 326                 typep = (char *)get_property(np, "compatible", NULL);
 327                 if (strstr(typep, "open-pic"))
 328                         ppc64_interrupt_controller = IC_OPEN_PIC;
 329                 else if (strstr(typep, "ppc-xicp"))
 330                         ppc64_interrupt_controller = IC_PPC_XIC;
 331                 else
 332                         printk("pSeries_discover_pic: failed to recognize"
 333                                " interrupt-controller\n");
 334                 break;
 335         }
 336 }
 337
 338 static void pSeries_mach_cpu_die(void)
 339 {
 340         local_irq_disable();
 341         idle_task_exit();
 342         /* Some hardware requires clearing the CPPR, while other hardware does not
 343          * it is safe either way
 344          */
 345         pSeriesLP_cppr_info(0, 0);
 346         rtas_stop_self();
 347         /* Should never get here... */
 348         BUG();
 349         for(;;);
 350 }
 351
 352 static int pseries_set_dabr(unsigned long dabr)
 353 {
 354         return plpar_hcall_norets(H_SET_DABR, dabr);
 355 }
 356
 357 static int pseries_set_xdabr(unsigned long dabr)
 358 {
 359         /* We want to catch accesses from kernel and userspace */
 360         return plpar_hcall_norets(H_SET_XDABR, dabr,
 361                         H_DABRX_KERNEL | H_DABRX_USER);
 362 }
 363
 364 /*
 365  * Early initialization.  Relocation is on but do not reference unbolted pages
 366  */
 367 static void __init pSeries_init_early(void)
 368 {
 369         int iommu_off = 0;
 370
 371         DBG(" -> pSeries_init_early()\n");
 372
 373         fw_feature_init();
 374
 375         if (platform_is_lpar())
 376                 hpte_init_lpar();
 377         else {
 378                 hpte_init_native();
 379                 iommu_off = (of_chosen &&
 380                              get_property(of_chosen, "linux,iommu-off", NULL));
 381         }
 382
 383         if (platform_is_lpar())
 384                 find_udbg_vterm();
 385
 386         if (firmware_has_feature(FW_FEATURE_DABR))
 387                 ppc_md.set_dabr = pseries_set_dabr;
 388         else if (firmware_has_feature(FW_FEATURE_XDABR))
 389                 ppc_md.set_dabr = pseries_set_xdabr;
 390
 391         iommu_init_early_pSeries();
 392
 393         pSeries_discover_pic();
 394
 395         DBG(" <- pSeries_init_early()\n");
 396 }
 397
 398
 399 static int pSeries_check_legacy_ioport(unsigned int baseport)
 400 {
 401         struct device_node *np;
 402
 403 #define I8042_DATA_REG  0x60
 404 #define FDC_BASE        0x3f0
 405
 406
 407         switch(baseport) {
 408         case I8042_DATA_REG:
 409                 np = of_find_node_by_type(NULL, "8042");
 410                 if (np == NULL)
 411                         return -ENODEV;
 412                 of_node_put(np);
 413                 break;
 414         case FDC_BASE:
 415                 np = of_find_node_by_type(NULL, "fdc");
 416                 if (np == NULL)
 417                         return -ENODEV;
 418                 of_node_put(np);
 419                 break;
 420         }
 421         return 0;
 422 }
 423
 424 /*
 425  * Called very early, MMU is off, device-tree isn't unflattened
 426  */
 427 extern struct machdep_calls pSeries_md;
 428
 429 static int __init pSeries_probe(int platform)
 430 {
 431         if (platform != PLATFORM_PSERIES &&
 432             platform != PLATFORM_PSERIES_LPAR)
 433                 return 0;
 434
 435         /* if we have some ppc_md fixups for LPAR to do, do
 436          * it here ...
 437          */
 438
 439         return 1;
 440 }
 441
 442 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 443
 444 static inline void dedicated_idle_sleep(unsigned int cpu)
 445 {
 446         struct paca_struct *ppaca = &paca[cpu ^ 1];
 447
 448         /* Only sleep if the other thread is not idle */
 449         if (!(ppaca->lppaca.idle)) {
 450                 local_irq_disable();
 451
 452                 /*
 453                  * We are about to sleep the thread and so wont be polling any
 454                  * more.
 455                  */
 456                 clear_thread_flag(TIF_POLLING_NRFLAG);
 457                 smp_mb__after_clear_bit();
 458
 459                 /*
 460                  * SMT dynamic mode. Cede will result in this thread going
 461                  * dormant, if the partner thread is still doing work.  Thread
 462                  * wakes up if partner goes idle, an interrupt is presented, or
 463                  * a prod occurs.  Returning from the cede enables external
 464                  * interrupts.
 465                  */
 466                 if (!need_resched())
 467                         cede_processor();
 468                 else
 469                         local_irq_enable();
 470                 set_thread_flag(TIF_POLLING_NRFLAG);
 471         } else {
 472                 /*
 473                  * Give the HV an opportunity at the processor, since we are
 474                  * not doing any work.
 475                  */
 476                 poll_pending();
 477         }
 478 }
 479
 480 static void pseries_dedicated_idle(void)
 481 {
 482         struct paca_struct *lpaca = get_paca();
 483         unsigned int cpu = smp_processor_id();
 484         unsigned long start_snooze;
 485         unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
 486         set_thread_flag(TIF_POLLING_NRFLAG);
 487
 488         while (1) {
 489                 /*
 490                  * Indicate to the HV that we are idle. Now would be
 491                  * a good time to find other work to dispatch.
 492                  */
 493                 lpaca->lppaca.idle = 1;
 494
 495                 if (!need_resched()) {
 496                         start_snooze = get_tb() +
 497                                 *smt_snooze_delay * tb_ticks_per_usec;
 498
 499                         while (!need_resched() && !cpu_is_offline(cpu)) {
 500                                 ppc64_runlatch_off();
 501
 502                                 /*
 503                                  * Go into low thread priority and possibly
 504                                  * low power mode.
 505                                  */
 506                                 HMT_low();
 507                                 HMT_very_low();
 508
 509                                 if (*smt_snooze_delay != 0 &&
 510                                     get_tb() > start_snooze) {
 511                                         HMT_medium();
 512                                         dedicated_idle_sleep(cpu);
 513                                 }
 514
 515                         }
 516
 517                         HMT_medium();
 518                 }
 519
 520                 lpaca->lppaca.idle = 0;
 521                 ppc64_runlatch_on();
 522
 523                 preempt_enable_no_resched();
 524                 schedule();
 525                 preempt_disable();
 526
 527                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 528                         cpu_die();
 529         }
 530 }
 531
 532 static void pseries_shared_idle(void)
 533 {
 534         struct paca_struct *lpaca = get_paca();
 535         unsigned int cpu = smp_processor_id();
 536
 537         while (1) {
 538                 /*
 539                  * Indicate to the HV that we are idle. Now would be
 540                  * a good time to find other work to dispatch.
 541                  */
 542                 lpaca->lppaca.idle = 1;
 543
 544                 while (!need_resched() && !cpu_is_offline(cpu)) {
 545                         local_irq_disable();
 546                         ppc64_runlatch_off();
 547
 548                         /*
 549                          * Yield the processor to the hypervisor.  We return if
 550                          * an external interrupt occurs (which are driven prior
 551                          * to returning here) or if a prod occurs from another
 552                          * processor. When returning here, external interrupts
 553                          * are enabled.
 554                          *
 555                          * Check need_resched() again with interrupts disabled
 556                          * to avoid a race.
 557                          */
 558                         if (!need_resched())
 559                                 cede_processor();
 560                         else
 561                                 local_irq_enable();
 562
 563                         HMT_medium();
 564                 }
 565
 566                 lpaca->lppaca.idle = 0;
 567                 ppc64_runlatch_on();
 568
 569                 preempt_enable_no_resched();
 570                 schedule();
 571                 preempt_disable();
 572
 573                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 574                         cpu_die();
 575         }
 576 }
 577
 578 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 579 {
 580         if (platform_is_lpar())
 581                 return PCI_PROBE_DEVTREE;
 582         return PCI_PROBE_NORMAL;
 583 }
 584
 585 #ifdef CONFIG_KEXEC
 586 static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
 587 {
 588         /* Don't risk a hypervisor call if we're crashing */
 589         if (!crash_shutdown) {
 590                 unsigned long vpa = __pa(&get_paca()->lppaca);
 591
 592                 if (unregister_vpa(hard_smp_processor_id(), vpa)) {
 593                         printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
 594                                         "failed\n", smp_processor_id(),
 595                                         hard_smp_processor_id());
 596                 }
 597         }
 598
 599         if (ppc64_interrupt_controller == IC_OPEN_PIC)
 600                 mpic_teardown_this_cpu(secondary);
 601         else
 602                 xics_teardown_cpu(secondary);
 603 }
 604 #endif
 605
 606 struct machdep_calls __initdata pSeries_md = {
 607         .probe                  = pSeries_probe,
 608         .setup_arch             = pSeries_setup_arch,
 609         .init_early             = pSeries_init_early,
 610         .show_cpuinfo           = pSeries_show_cpuinfo,
 611         .log_error              = pSeries_log_error,
 612         .pcibios_fixup          = pSeries_final_fixup,
 613         .pci_probe_mode         = pSeries_pci_probe_mode,
 614         .irq_bus_setup          = pSeries_irq_bus_setup,
 615         .restart                = rtas_restart,
 616         .power_off              = rtas_power_off,
 617         .halt                   = rtas_halt,
 618         .panic                  = rtas_os_term,
 619         .cpu_die                = pSeries_mach_cpu_die,
 620         .get_boot_time          = rtas_get_boot_time,
 621         .get_rtc_time           = rtas_get_rtc_time,
 622         .set_rtc_time           = rtas_set_rtc_time,
 623         .calibrate_decr         = generic_calibrate_decr,
 624         .progress               = rtas_progress,
 625         .check_legacy_ioport    = pSeries_check_legacy_ioport,
 626         .system_reset_exception = pSeries_system_reset_exception,
 627         .machine_check_exception = pSeries_machine_check_exception,
 628 #ifdef CONFIG_KEXEC
 629         .kexec_cpu_down         = pseries_kexec_cpu_down,
 630         .machine_kexec          = default_machine_kexec,
 631         .machine_kexec_prepare  = default_machine_kexec_prepare,
 632         .machine_crash_shutdown = default_machine_crash_shutdown,
 633 #endif
 634 };