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 extern void system_reset_fwnmi(void);   /* from head.S */
  81 extern void machine_check_fwnmi(void);  /* from head.S */
  82
  83 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  84
  85 extern void pSeries_system_reset_exception(struct pt_regs *regs);
  86 extern int pSeries_machine_check_exception(struct pt_regs *regs);
  87
  88 static void pseries_shared_idle(void);
  89 static void pseries_dedicated_idle(void);
  90
  91 struct mpic *pSeries_mpic;
  92
  93 void pSeries_show_cpuinfo(struct seq_file *m)
  94 {
  95         struct device_node *root;
  96         const char *model = "";
  97
  98         root = of_find_node_by_path("/");
  99         if (root)
 100                 model = get_property(root, "model", NULL);
 101         seq_printf(m, "machine\t\t: CHRP %s\n", model);
 102         of_node_put(root);
 103 }
 104
 105 /* Initialize firmware assisted non-maskable interrupts if
 106  * the firmware supports this feature.
 107  *
 108  */
 109 static void __init fwnmi_init(void)
 110 {
 111         int ret;
 112         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 113         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 114                 return;
 115         ret = rtas_call(ibm_nmi_register, 2, 1, NULL,
 116                         __pa((unsigned long)system_reset_fwnmi),
 117                         __pa((unsigned long)machine_check_fwnmi));
 118         if (ret == 0)
 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_paca()->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_paca()->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 (platform_is_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
 266 /* Build up the ppc64_firmware_features bitmask field
 267  * using contents of device-tree/ibm,hypertas-functions.
 268  * Ultimately this functionality may be moved into prom.c prom_init().
 269  */
 270 static void __init fw_feature_init(void)
 271 {
 272         struct device_node * dn;
 273         char * hypertas;
 274         unsigned int len;
 275
 276         DBG(" -> fw_feature_init()\n");
 277
 278         ppc64_firmware_features = 0;
 279         dn = of_find_node_by_path("/rtas");
 280         if (dn == NULL) {
 281                 printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n");
 282                 goto no_rtas;
 283         }
 284
 285         hypertas = get_property(dn, "ibm,hypertas-functions", &len);
 286         if (hypertas) {
 287                 while (len > 0){
 288                         int i, hypertas_len;
 289                         /* check value against table of strings */
 290                         for(i=0; i < FIRMWARE_MAX_FEATURES ;i++) {
 291                                 if ((firmware_features_table[i].name) &&
 292                                     (strcmp(firmware_features_table[i].name,hypertas))==0) {
 293                                         /* we have a match */
 294                                         ppc64_firmware_features |=
 295                                                 (firmware_features_table[i].val);
 296                                         break;
 297                                 }
 298                         }
 299                         hypertas_len = strlen(hypertas);
 300                         len -= hypertas_len +1;
 301                         hypertas+= hypertas_len +1;
 302                 }
 303         }
 304
 305         of_node_put(dn);
 306 no_rtas:
 307
 308         DBG(" <- fw_feature_init()\n");
 309 }
 310
 311
 312 static  void __init pSeries_discover_pic(void)
 313 {
 314         struct device_node *np;
 315         char *typep;
 316
 317         /*
 318          * Setup interrupt mapping options that are needed for finish_device_tree
 319          * to properly parse the OF interrupt tree & do the virtual irq mapping
 320          */
 321         __irq_offset_value = NUM_ISA_INTERRUPTS;
 322         ppc64_interrupt_controller = IC_INVALID;
 323         for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
 324                 typep = (char *)get_property(np, "compatible", NULL);
 325                 if (strstr(typep, "open-pic"))
 326                         ppc64_interrupt_controller = IC_OPEN_PIC;
 327                 else if (strstr(typep, "ppc-xicp"))
 328                         ppc64_interrupt_controller = IC_PPC_XIC;
 329                 else
 330                         printk("pSeries_discover_pic: failed to recognize"
 331                                " interrupt-controller\n");
 332                 break;
 333         }
 334 }
 335
 336 static void pSeries_mach_cpu_die(void)
 337 {
 338         local_irq_disable();
 339         idle_task_exit();
 340         /* Some hardware requires clearing the CPPR, while other hardware does not
 341          * it is safe either way
 342          */
 343         pSeriesLP_cppr_info(0, 0);
 344         rtas_stop_self();
 345         /* Should never get here... */
 346         BUG();
 347         for(;;);
 348 }
 349
 350 static int pseries_set_dabr(unsigned long dabr)
 351 {
 352         return plpar_hcall_norets(H_SET_DABR, dabr);
 353 }
 354
 355 static int pseries_set_xdabr(unsigned long dabr)
 356 {
 357         /* We want to catch accesses from kernel and userspace */
 358         return plpar_hcall_norets(H_SET_XDABR, dabr,
 359                         H_DABRX_KERNEL | H_DABRX_USER);
 360 }
 361
 362 /*
 363  * Early initialization.  Relocation is on but do not reference unbolted pages
 364  */
 365 static void __init pSeries_init_early(void)
 366 {
 367         int iommu_off = 0;
 368
 369         DBG(" -> pSeries_init_early()\n");
 370
 371         fw_feature_init();
 372
 373         if (platform_is_lpar())
 374                 hpte_init_lpar();
 375         else {
 376                 hpte_init_native();
 377                 iommu_off = (of_chosen &&
 378                              get_property(of_chosen, "linux,iommu-off", NULL));
 379         }
 380
 381         if (platform_is_lpar())
 382                 find_udbg_vterm();
 383
 384         if (firmware_has_feature(FW_FEATURE_DABR))
 385                 ppc_md.set_dabr = pseries_set_dabr;
 386         else if (firmware_has_feature(FW_FEATURE_XDABR))
 387                 ppc_md.set_dabr = pseries_set_xdabr;
 388
 389         iommu_init_early_pSeries();
 390
 391         pSeries_discover_pic();
 392
 393         DBG(" <- pSeries_init_early()\n");
 394 }
 395
 396
 397 static int pSeries_check_legacy_ioport(unsigned int baseport)
 398 {
 399         struct device_node *np;
 400
 401 #define I8042_DATA_REG  0x60
 402 #define FDC_BASE        0x3f0
 403
 404
 405         switch(baseport) {
 406         case I8042_DATA_REG:
 407                 np = of_find_node_by_type(NULL, "8042");
 408                 if (np == NULL)
 409                         return -ENODEV;
 410                 of_node_put(np);
 411                 break;
 412         case FDC_BASE:
 413                 np = of_find_node_by_type(NULL, "fdc");
 414                 if (np == NULL)
 415                         return -ENODEV;
 416                 of_node_put(np);
 417                 break;
 418         }
 419         return 0;
 420 }
 421
 422 /*
 423  * Called very early, MMU is off, device-tree isn't unflattened
 424  */
 425 extern struct machdep_calls pSeries_md;
 426
 427 static int __init pSeries_probe(int platform)
 428 {
 429         if (platform != PLATFORM_PSERIES &&
 430             platform != PLATFORM_PSERIES_LPAR)
 431                 return 0;
 432
 433         /* if we have some ppc_md fixups for LPAR to do, do
 434          * it here ...
 435          */
 436
 437         return 1;
 438 }
 439
 440 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 441
 442 static inline void dedicated_idle_sleep(unsigned int cpu)
 443 {
 444         struct paca_struct *ppaca = &paca[cpu ^ 1];
 445
 446         /* Only sleep if the other thread is not idle */
 447         if (!(ppaca->lppaca.idle)) {
 448                 local_irq_disable();
 449
 450                 /*
 451                  * We are about to sleep the thread and so wont be polling any
 452                  * more.
 453                  */
 454                 clear_thread_flag(TIF_POLLING_NRFLAG);
 455                 smp_mb__after_clear_bit();
 456
 457                 /*
 458                  * SMT dynamic mode. Cede will result in this thread going
 459                  * dormant, if the partner thread is still doing work.  Thread
 460                  * wakes up if partner goes idle, an interrupt is presented, or
 461                  * a prod occurs.  Returning from the cede enables external
 462                  * interrupts.
 463                  */
 464                 if (!need_resched())
 465                         cede_processor();
 466                 else
 467                         local_irq_enable();
 468                 set_thread_flag(TIF_POLLING_NRFLAG);
 469         } else {
 470                 /*
 471                  * Give the HV an opportunity at the processor, since we are
 472                  * not doing any work.
 473                  */
 474                 poll_pending();
 475         }
 476 }
 477
 478 static void pseries_dedicated_idle(void)
 479 {
 480         struct paca_struct *lpaca = get_paca();
 481         unsigned int cpu = smp_processor_id();
 482         unsigned long start_snooze;
 483         unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
 484         set_thread_flag(TIF_POLLING_NRFLAG);
 485
 486         while (1) {
 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                 lpaca->lppaca.idle = 1;
 492
 493                 if (!need_resched()) {
 494                         start_snooze = get_tb() +
 495                                 *smt_snooze_delay * tb_ticks_per_usec;
 496
 497                         while (!need_resched() && !cpu_is_offline(cpu)) {
 498                                 ppc64_runlatch_off();
 499
 500                                 /*
 501                                  * Go into low thread priority and possibly
 502                                  * low power mode.
 503                                  */
 504                                 HMT_low();
 505                                 HMT_very_low();
 506
 507                                 if (*smt_snooze_delay != 0 &&
 508                                     get_tb() > start_snooze) {
 509                                         HMT_medium();
 510                                         dedicated_idle_sleep(cpu);
 511                                 }
 512
 513                         }
 514
 515                         HMT_medium();
 516                 }
 517
 518                 lpaca->lppaca.idle = 0;
 519                 ppc64_runlatch_on();
 520
 521                 preempt_enable_no_resched();
 522                 schedule();
 523                 preempt_disable();
 524
 525                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 526                         cpu_die();
 527         }
 528 }
 529
 530 static void pseries_shared_idle(void)
 531 {
 532         struct paca_struct *lpaca = get_paca();
 533         unsigned int cpu = smp_processor_id();
 534
 535         while (1) {
 536                 /*
 537                  * Indicate to the HV that we are idle. Now would be
 538                  * a good time to find other work to dispatch.
 539                  */
 540                 lpaca->lppaca.idle = 1;
 541
 542                 while (!need_resched() && !cpu_is_offline(cpu)) {
 543                         local_irq_disable();
 544                         ppc64_runlatch_off();
 545
 546                         /*
 547                          * Yield the processor to the hypervisor.  We return if
 548                          * an external interrupt occurs (which are driven prior
 549                          * to returning here) or if a prod occurs from another
 550                          * processor. When returning here, external interrupts
 551                          * are enabled.
 552                          *
 553                          * Check need_resched() again with interrupts disabled
 554                          * to avoid a race.
 555                          */
 556                         if (!need_resched())
 557                                 cede_processor();
 558                         else
 559                                 local_irq_enable();
 560
 561                         HMT_medium();
 562                 }
 563
 564                 lpaca->lppaca.idle = 0;
 565                 ppc64_runlatch_on();
 566
 567                 preempt_enable_no_resched();
 568                 schedule();
 569                 preempt_disable();
 570
 571                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 572                         cpu_die();
 573         }
 574 }
 575
 576 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 577 {
 578         if (platform_is_lpar())
 579                 return PCI_PROBE_DEVTREE;
 580         return PCI_PROBE_NORMAL;
 581 }
 582
 583 #ifdef CONFIG_KEXEC
 584 static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
 585 {
 586         /* Don't risk a hypervisor call if we're crashing */
 587         if (!crash_shutdown) {
 588                 unsigned long vpa = __pa(&get_paca()->lppaca);
 589
 590                 if (unregister_vpa(hard_smp_processor_id(), vpa)) {
 591                         printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
 592                                         "failed\n", smp_processor_id(),
 593                                         hard_smp_processor_id());
 594                 }
 595         }
 596
 597         if (ppc64_interrupt_controller == IC_OPEN_PIC)
 598                 mpic_teardown_this_cpu(secondary);
 599         else
 600                 xics_teardown_cpu(secondary);
 601 }
 602 #endif
 603
 604 struct machdep_calls __initdata pSeries_md = {
 605         .probe                  = pSeries_probe,
 606         .setup_arch             = pSeries_setup_arch,
 607         .init_early             = pSeries_init_early,
 608         .show_cpuinfo           = pSeries_show_cpuinfo,
 609         .log_error              = pSeries_log_error,
 610         .pcibios_fixup          = pSeries_final_fixup,
 611         .pci_probe_mode         = pSeries_pci_probe_mode,
 612         .irq_bus_setup          = pSeries_irq_bus_setup,
 613         .restart                = rtas_restart,
 614         .power_off              = rtas_power_off,
 615         .halt                   = rtas_halt,
 616         .panic                  = rtas_os_term,
 617         .cpu_die                = pSeries_mach_cpu_die,
 618         .get_boot_time          = rtas_get_boot_time,
 619         .get_rtc_time           = rtas_get_rtc_time,
 620         .set_rtc_time           = rtas_set_rtc_time,
 621         .calibrate_decr         = generic_calibrate_decr,
 622         .progress               = rtas_progress,
 623         .check_legacy_ioport    = pSeries_check_legacy_ioport,
 624         .system_reset_exception = pSeries_system_reset_exception,
 625         .machine_check_exception = pSeries_machine_check_exception,
 626 #ifdef CONFIG_KEXEC
 627         .kexec_cpu_down         = pseries_kexec_cpu_down,
 628         .machine_kexec          = default_machine_kexec,
 629         .machine_kexec_prepare  = default_machine_kexec_prepare,
 630 #endif
 631 };