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/pmc.h>
  64 #include <asm/mpic.h>
  65 #include <asm/ppc-pci.h>
  66 #include <asm/i8259.h>
  67 #include <asm/udbg.h>
  68 #include <asm/smp.h>
  69
  70 #include "plpar_wrappers.h"
  71 #include "ras.h"
  72 #include "firmware.h"
  73
  74 #ifdef DEBUG
  75 #define DBG(fmt...) udbg_printf(fmt)
  76 #else
  77 #define DBG(fmt...)
  78 #endif
  79
  80 extern void find_udbg_vterm(void);
  81
  82 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  83
  84 static void pseries_shared_idle(void);
  85 static void pseries_dedicated_idle(void);
  86
  87 struct mpic *pSeries_mpic;
  88
  89 static void pSeries_show_cpuinfo(struct seq_file *m)
  90 {
  91         struct device_node *root;
  92         const char *model = "";
  93
  94         root = of_find_node_by_path("/");
  95         if (root)
  96                 model = get_property(root, "model", NULL);
  97         seq_printf(m, "machine\t\t: CHRP %s\n", model);
  98         of_node_put(root);
  99 }
 100
 101 /* Initialize firmware assisted non-maskable interrupts if
 102  * the firmware supports this feature.
 103  */
 104 static void __init fwnmi_init(void)
 105 {
 106         unsigned long system_reset_addr, machine_check_addr;
 107
 108         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 109         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 110                 return;
 111
 112         /* If the kernel's not linked at zero we point the firmware at low
 113          * addresses anyway, and use a trampoline to get to the real code. */
 114         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
 115         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
 116
 117         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
 118                                 machine_check_addr))
 119                 fwnmi_active = 1;
 120 }
 121
 122 static void __init pSeries_init_mpic(void)
 123 {
 124         unsigned int *addrp;
 125         struct device_node *np;
 126         unsigned long intack = 0;
 127
 128         /* All ISUs are setup, complete initialization */
 129         mpic_init(pSeries_mpic);
 130
 131         /* Check what kind of cascade ACK we have */
 132         if (!(np = of_find_node_by_name(NULL, "pci"))
 133             || !(addrp = (unsigned int *)
 134                  get_property(np, "8259-interrupt-acknowledge", NULL)))
 135                 printk(KERN_ERR "Cannot find pci to get ack address\n");
 136         else
 137                 intack = addrp[prom_n_addr_cells(np)-1];
 138         of_node_put(np);
 139
 140         /* Setup the legacy interrupts & controller */
 141         i8259_init(intack, 0);
 142
 143         /* Hook cascade to mpic */
 144         mpic_setup_cascade(NUM_ISA_INTERRUPTS, i8259_irq_cascade, NULL);
 145 }
 146
 147 static void __init pSeries_setup_mpic(void)
 148 {
 149         unsigned int *opprop;
 150         unsigned long openpic_addr = 0;
 151         unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
 152         struct device_node *root;
 153         int irq_count;
 154
 155         /* Find the Open PIC if present */
 156         root = of_find_node_by_path("/");
 157         opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
 158         if (opprop != 0) {
 159                 int n = prom_n_addr_cells(root);
 160
 161                 for (openpic_addr = 0; n > 0; --n)
 162                         openpic_addr = (openpic_addr << 32) + *opprop++;
 163                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 164         }
 165         of_node_put(root);
 166
 167         BUG_ON(openpic_addr == 0);
 168
 169         /* Get the sense values from OF */
 170         prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
 171
 172         /* Setup the openpic driver */
 173         irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
 174         pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
 175                                   16, 16, irq_count, /* isu size, irq offset, irq count */
 176                                   NR_IRQS - 4, /* ipi offset */
 177                                   senses, irq_count, /* sense & sense size */
 178                                   " MPIC     ");
 179 }
 180
 181 static void pseries_lpar_enable_pmcs(void)
 182 {
 183         unsigned long set, reset;
 184
 185         power4_enable_pmcs();
 186
 187         set = 1UL << 63;
 188         reset = 0;
 189         plpar_hcall_norets(H_PERFMON, set, reset);
 190
 191         /* instruct hypervisor to maintain PMCs */
 192         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 193                 get_lppaca()->pmcregs_in_use = 1;
 194 }
 195
 196 static void __init pSeries_setup_arch(void)
 197 {
 198         /* Fixup ppc_md depending on the type of interrupt controller */
 199         if (ppc64_interrupt_controller == IC_OPEN_PIC) {
 200                 ppc_md.init_IRQ       = pSeries_init_mpic;
 201                 ppc_md.get_irq        = mpic_get_irq;
 202                 /* Allocate the mpic now, so that find_and_init_phbs() can
 203                  * fill the ISUs */
 204                 pSeries_setup_mpic();
 205         } else {
 206                 ppc_md.init_IRQ       = xics_init_IRQ;
 207                 ppc_md.get_irq        = xics_get_irq;
 208         }
 209
 210 #ifdef CONFIG_SMP
 211         smp_init_pSeries();
 212 #endif
 213         /* openpic global configuration register (64-bit format). */
 214         /* openpic Interrupt Source Unit pointer (64-bit format). */
 215         /* python0 facility area (mmio) (64-bit format) REAL address. */
 216
 217         /* init to some ~sane value until calibrate_delay() runs */
 218         loops_per_jiffy = 50000000;
 219
 220         if (ROOT_DEV == 0) {
 221                 printk("No ramdisk, default root is /dev/sda2\n");
 222                 ROOT_DEV = Root_SDA2;
 223         }
 224
 225         fwnmi_init();
 226
 227         /* Find and initialize PCI host bridges */
 228         init_pci_config_tokens();
 229         find_and_init_phbs();
 230         eeh_init();
 231
 232         pSeries_nvram_init();
 233
 234         /* Choose an idle loop */
 235         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 236                 vpa_init(boot_cpuid);
 237                 if (get_lppaca()->shared_proc) {
 238                         printk(KERN_INFO "Using shared processor idle loop\n");
 239                         ppc_md.idle_loop = pseries_shared_idle;
 240                 } else {
 241                         printk(KERN_INFO "Using dedicated idle loop\n");
 242                         ppc_md.idle_loop = pseries_dedicated_idle;
 243                 }
 244         } else {
 245                 printk(KERN_INFO "Using default idle loop\n");
 246                 ppc_md.idle_loop = default_idle;
 247         }
 248
 249         if (firmware_has_feature(FW_FEATURE_LPAR))
 250                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 251         else
 252                 ppc_md.enable_pmcs = power4_enable_pmcs;
 253 }
 254
 255 static int __init pSeries_init_panel(void)
 256 {
 257         /* Manually leave the kernel version on the panel. */
 258         ppc_md.progress("Linux ppc64\n", 0);
 259         ppc_md.progress(system_utsname.version, 0);
 260
 261         return 0;
 262 }
 263 arch_initcall(pSeries_init_panel);
 264
 265 static  void __init pSeries_discover_pic(void)
 266 {
 267         struct device_node *np;
 268         char *typep;
 269
 270         /*
 271          * Setup interrupt mapping options that are needed for finish_device_tree
 272          * to properly parse the OF interrupt tree & do the virtual irq mapping
 273          */
 274         __irq_offset_value = NUM_ISA_INTERRUPTS;
 275         ppc64_interrupt_controller = IC_INVALID;
 276         for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
 277                 typep = (char *)get_property(np, "compatible", NULL);
 278                 if (strstr(typep, "open-pic")) {
 279                         ppc64_interrupt_controller = IC_OPEN_PIC;
 280                         break;
 281                 } else if (strstr(typep, "ppc-xicp")) {
 282                         ppc64_interrupt_controller = IC_PPC_XIC;
 283                         break;
 284                 }
 285         }
 286         if (ppc64_interrupt_controller == IC_INVALID)
 287                 printk("pSeries_discover_pic: failed to recognize"
 288                         " interrupt-controller\n");
 289
 290 }
 291
 292 static void pSeries_mach_cpu_die(void)
 293 {
 294         local_irq_disable();
 295         idle_task_exit();
 296         /* Some hardware requires clearing the CPPR, while other hardware does not
 297          * it is safe either way
 298          */
 299         pSeriesLP_cppr_info(0, 0);
 300         rtas_stop_self();
 301         /* Should never get here... */
 302         BUG();
 303         for(;;);
 304 }
 305
 306 static int pseries_set_dabr(unsigned long dabr)
 307 {
 308         return plpar_hcall_norets(H_SET_DABR, dabr);
 309 }
 310
 311 static int pseries_set_xdabr(unsigned long dabr)
 312 {
 313         /* We want to catch accesses from kernel and userspace */
 314         return plpar_hcall_norets(H_SET_XDABR, dabr,
 315                         H_DABRX_KERNEL | H_DABRX_USER);
 316 }
 317
 318 /*
 319  * Early initialization.  Relocation is on but do not reference unbolted pages
 320  */
 321 static void __init pSeries_init_early(void)
 322 {
 323         DBG(" -> pSeries_init_early()\n");
 324
 325         fw_feature_init();
 326
 327         if (firmware_has_feature(FW_FEATURE_LPAR))
 328                 hpte_init_lpar();
 329         else
 330                 hpte_init_native();
 331
 332         if (firmware_has_feature(FW_FEATURE_LPAR))
 333                 find_udbg_vterm();
 334
 335         if (firmware_has_feature(FW_FEATURE_DABR))
 336                 ppc_md.set_dabr = pseries_set_dabr;
 337         else if (firmware_has_feature(FW_FEATURE_XDABR))
 338                 ppc_md.set_dabr = pseries_set_xdabr;
 339
 340         iommu_init_early_pSeries();
 341
 342         pSeries_discover_pic();
 343
 344         DBG(" <- pSeries_init_early()\n");
 345 }
 346
 347
 348 static int pSeries_check_legacy_ioport(unsigned int baseport)
 349 {
 350         struct device_node *np;
 351
 352 #define I8042_DATA_REG  0x60
 353 #define FDC_BASE        0x3f0
 354
 355
 356         switch(baseport) {
 357         case I8042_DATA_REG:
 358                 np = of_find_node_by_type(NULL, "8042");
 359                 if (np == NULL)
 360                         return -ENODEV;
 361                 of_node_put(np);
 362                 break;
 363         case FDC_BASE:
 364                 np = of_find_node_by_type(NULL, "fdc");
 365                 if (np == NULL)
 366                         return -ENODEV;
 367                 of_node_put(np);
 368                 break;
 369         }
 370         return 0;
 371 }
 372
 373 /*
 374  * Called very early, MMU is off, device-tree isn't unflattened
 375  */
 376 extern struct machdep_calls pSeries_md;
 377
 378 static int __init pSeries_probe(int platform)
 379 {
 380         if (platform != PLATFORM_PSERIES &&
 381             platform != PLATFORM_PSERIES_LPAR)
 382                 return 0;
 383
 384         /* if we have some ppc_md fixups for LPAR to do, do
 385          * it here ...
 386          */
 387
 388         if (platform == PLATFORM_PSERIES_LPAR)
 389                 ppc64_firmware_features |= FW_FEATURE_LPAR;
 390
 391         return 1;
 392 }
 393
 394 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 395
 396 static inline void dedicated_idle_sleep(unsigned int cpu)
 397 {
 398         struct lppaca *plppaca = &lppaca[cpu ^ 1];
 399
 400         /* Only sleep if the other thread is not idle */
 401         if (!(plppaca->idle)) {
 402                 local_irq_disable();
 403
 404                 /*
 405                  * We are about to sleep the thread and so wont be polling any
 406                  * more.
 407                  */
 408                 clear_thread_flag(TIF_POLLING_NRFLAG);
 409                 smp_mb__after_clear_bit();
 410
 411                 /*
 412                  * SMT dynamic mode. Cede will result in this thread going
 413                  * dormant, if the partner thread is still doing work.  Thread
 414                  * wakes up if partner goes idle, an interrupt is presented, or
 415                  * a prod occurs.  Returning from the cede enables external
 416                  * interrupts.
 417                  */
 418                 if (!need_resched())
 419                         cede_processor();
 420                 else
 421                         local_irq_enable();
 422                 set_thread_flag(TIF_POLLING_NRFLAG);
 423         } else {
 424                 /*
 425                  * Give the HV an opportunity at the processor, since we are
 426                  * not doing any work.
 427                  */
 428                 poll_pending();
 429         }
 430 }
 431
 432 static void pseries_dedicated_idle(void)
 433 {
 434         unsigned int cpu = smp_processor_id();
 435         unsigned long start_snooze;
 436         unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
 437         set_thread_flag(TIF_POLLING_NRFLAG);
 438
 439         while (1) {
 440                 /*
 441                  * Indicate to the HV that we are idle. Now would be
 442                  * a good time to find other work to dispatch.
 443                  */
 444                 get_lppaca()->idle = 1;
 445
 446                 if (!need_resched()) {
 447                         start_snooze = get_tb() +
 448                                 *smt_snooze_delay * tb_ticks_per_usec;
 449
 450                         while (!need_resched() && !cpu_is_offline(cpu)) {
 451                                 ppc64_runlatch_off();
 452
 453                                 /*
 454                                  * Go into low thread priority and possibly
 455                                  * low power mode.
 456                                  */
 457                                 HMT_low();
 458                                 HMT_very_low();
 459
 460                                 if (*smt_snooze_delay != 0 &&
 461                                     get_tb() > start_snooze) {
 462                                         HMT_medium();
 463                                         dedicated_idle_sleep(cpu);
 464                                 }
 465
 466                         }
 467
 468                         HMT_medium();
 469                 }
 470
 471                 get_lppaca()->idle = 0;
 472                 ppc64_runlatch_on();
 473
 474                 preempt_enable_no_resched();
 475                 schedule();
 476                 preempt_disable();
 477
 478                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 479                         cpu_die();
 480         }
 481 }
 482
 483 static void pseries_shared_idle(void)
 484 {
 485         unsigned int cpu = smp_processor_id();
 486
 487         while (1) {
 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
 494                 while (!need_resched() && !cpu_is_offline(cpu)) {
 495                         local_irq_disable();
 496                         ppc64_runlatch_off();
 497
 498                         /*
 499                          * Yield the processor to the hypervisor.  We return if
 500                          * an external interrupt occurs (which are driven prior
 501                          * to returning here) or if a prod occurs from another
 502                          * processor. When returning here, external interrupts
 503                          * are enabled.
 504                          *
 505                          * Check need_resched() again with interrupts disabled
 506                          * to avoid a race.
 507                          */
 508                         if (!need_resched())
 509                                 cede_processor();
 510                         else
 511                                 local_irq_enable();
 512
 513                         HMT_medium();
 514                 }
 515
 516                 get_lppaca()->idle = 0;
 517                 ppc64_runlatch_on();
 518
 519                 preempt_enable_no_resched();
 520                 schedule();
 521                 preempt_disable();
 522
 523                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 524                         cpu_die();
 525         }
 526 }
 527
 528 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 529 {
 530         if (firmware_has_feature(FW_FEATURE_LPAR))
 531                 return PCI_PROBE_DEVTREE;
 532         return PCI_PROBE_NORMAL;
 533 }
 534
 535 #ifdef CONFIG_KEXEC
 536 static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
 537 {
 538         /* Don't risk a hypervisor call if we're crashing */
 539         if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
 540                 unsigned long vpa = __pa(get_lppaca());
 541
 542                 if (unregister_vpa(hard_smp_processor_id(), vpa)) {
 543                         printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
 544                                         "failed\n", smp_processor_id(),
 545                                         hard_smp_processor_id());
 546                 }
 547         }
 548
 549         if (ppc64_interrupt_controller == IC_OPEN_PIC)
 550                 mpic_teardown_this_cpu(secondary);
 551         else
 552                 xics_teardown_cpu(secondary);
 553 }
 554 #endif
 555
 556 struct machdep_calls __initdata pSeries_md = {
 557         .probe                  = pSeries_probe,
 558         .setup_arch             = pSeries_setup_arch,
 559         .init_early             = pSeries_init_early,
 560         .show_cpuinfo           = pSeries_show_cpuinfo,
 561         .log_error              = pSeries_log_error,
 562         .pcibios_fixup          = pSeries_final_fixup,
 563         .pci_probe_mode         = pSeries_pci_probe_mode,
 564         .irq_bus_setup          = pSeries_irq_bus_setup,
 565         .restart                = rtas_restart,
 566         .power_off              = rtas_power_off,
 567         .halt                   = rtas_halt,
 568         .panic                  = rtas_os_term,
 569         .cpu_die                = pSeries_mach_cpu_die,
 570         .get_boot_time          = rtas_get_boot_time,
 571         .get_rtc_time           = rtas_get_rtc_time,
 572         .set_rtc_time           = rtas_set_rtc_time,
 573         .calibrate_decr         = generic_calibrate_decr,
 574         .progress               = rtas_progress,
 575         .check_legacy_ioport    = pSeries_check_legacy_ioport,
 576         .system_reset_exception = pSeries_system_reset_exception,
 577         .machine_check_exception = pSeries_machine_check_exception,
 578 #ifdef CONFIG_KEXEC
 579         .kexec_cpu_down         = pseries_kexec_cpu_down,
 580         .machine_kexec          = default_machine_kexec,
 581         .machine_kexec_prepare  = default_machine_kexec_prepare,
 582         .machine_crash_shutdown = default_machine_crash_shutdown,
 583 #endif
 584 };