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 extern void generic_find_legacy_serial_ports(u64 *physport,
  83                 unsigned int *default_speed);
  84
  85 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  86
  87 extern void pSeries_system_reset_exception(struct pt_regs *regs);
  88 extern int pSeries_machine_check_exception(struct pt_regs *regs);
  89
  90 static void pseries_shared_idle(void);
  91 static void pseries_dedicated_idle(void);
  92
  93 struct mpic *pSeries_mpic;
  94
  95 void pSeries_show_cpuinfo(struct seq_file *m)
  96 {
  97         struct device_node *root;
  98         const char *model = "";
  99
 100         root = of_find_node_by_path("/");
 101         if (root)
 102                 model = get_property(root, "model", NULL);
 103         seq_printf(m, "machine\t\t: CHRP %s\n", model);
 104         of_node_put(root);
 105 }
 106
 107 /* Initialize firmware assisted non-maskable interrupts if
 108  * the firmware supports this feature.
 109  *
 110  */
 111 static void __init fwnmi_init(void)
 112 {
 113         int ret;
 114         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 115         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 116                 return;
 117         ret = rtas_call(ibm_nmi_register, 2, 1, NULL,
 118                         __pa((unsigned long)system_reset_fwnmi),
 119                         __pa((unsigned long)machine_check_fwnmi));
 120         if (ret == 0)
 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         void *comport;
 370         int iommu_off = 0;
 371         unsigned int default_speed;
 372         u64 physport;
 373
 374         DBG(" -> pSeries_init_early()\n");
 375
 376         fw_feature_init();
 377
 378         if (platform_is_lpar())
 379                 hpte_init_lpar();
 380         else {
 381                 hpte_init_native();
 382                 iommu_off = (of_chosen &&
 383                              get_property(of_chosen, "linux,iommu-off", NULL));
 384         }
 385
 386         generic_find_legacy_serial_ports(&physport, &default_speed);
 387
 388         if (platform_is_lpar())
 389                 find_udbg_vterm();
 390         else if (physport) {
 391                 /* Map the uart for udbg. */
 392                 comport = (void *)ioremap(physport, 16);
 393                 udbg_init_uart(comport, default_speed);
 394
 395                 DBG("Hello World !\n");
 396         }
 397
 398         if (firmware_has_feature(FW_FEATURE_DABR))
 399                 ppc_md.set_dabr = pseries_set_dabr;
 400         else if (firmware_has_feature(FW_FEATURE_XDABR))
 401                 ppc_md.set_dabr = pseries_set_xdabr;
 402
 403         iommu_init_early_pSeries();
 404
 405         pSeries_discover_pic();
 406
 407         DBG(" <- pSeries_init_early()\n");
 408 }
 409
 410
 411 static int pSeries_check_legacy_ioport(unsigned int baseport)
 412 {
 413         struct device_node *np;
 414
 415 #define I8042_DATA_REG  0x60
 416 #define FDC_BASE        0x3f0
 417
 418
 419         switch(baseport) {
 420         case I8042_DATA_REG:
 421                 np = of_find_node_by_type(NULL, "8042");
 422                 if (np == NULL)
 423                         return -ENODEV;
 424                 of_node_put(np);
 425                 break;
 426         case FDC_BASE:
 427                 np = of_find_node_by_type(NULL, "fdc");
 428                 if (np == NULL)
 429                         return -ENODEV;
 430                 of_node_put(np);
 431                 break;
 432         }
 433         return 0;
 434 }
 435
 436 /*
 437  * Called very early, MMU is off, device-tree isn't unflattened
 438  */
 439 extern struct machdep_calls pSeries_md;
 440
 441 static int __init pSeries_probe(int platform)
 442 {
 443         if (platform != PLATFORM_PSERIES &&
 444             platform != PLATFORM_PSERIES_LPAR)
 445                 return 0;
 446
 447         /* if we have some ppc_md fixups for LPAR to do, do
 448          * it here ...
 449          */
 450
 451         return 1;
 452 }
 453
 454 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 455
 456 static inline void dedicated_idle_sleep(unsigned int cpu)
 457 {
 458         struct paca_struct *ppaca = &paca[cpu ^ 1];
 459
 460         /* Only sleep if the other thread is not idle */
 461         if (!(ppaca->lppaca.idle)) {
 462                 local_irq_disable();
 463
 464                 /*
 465                  * We are about to sleep the thread and so wont be polling any
 466                  * more.
 467                  */
 468                 clear_thread_flag(TIF_POLLING_NRFLAG);
 469                 smp_mb__after_clear_bit();
 470
 471                 /*
 472                  * SMT dynamic mode. Cede will result in this thread going
 473                  * dormant, if the partner thread is still doing work.  Thread
 474                  * wakes up if partner goes idle, an interrupt is presented, or
 475                  * a prod occurs.  Returning from the cede enables external
 476                  * interrupts.
 477                  */
 478                 if (!need_resched())
 479                         cede_processor();
 480                 else
 481                         local_irq_enable();
 482                 set_thread_flag(TIF_POLLING_NRFLAG);
 483         } else {
 484                 /*
 485                  * Give the HV an opportunity at the processor, since we are
 486                  * not doing any work.
 487                  */
 488                 poll_pending();
 489         }
 490 }
 491
 492 static void pseries_dedicated_idle(void)
 493 {
 494         struct paca_struct *lpaca = get_paca();
 495         unsigned int cpu = smp_processor_id();
 496         unsigned long start_snooze;
 497         unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
 498         set_thread_flag(TIF_POLLING_NRFLAG);
 499
 500         while (1) {
 501                 /*
 502                  * Indicate to the HV that we are idle. Now would be
 503                  * a good time to find other work to dispatch.
 504                  */
 505                 lpaca->lppaca.idle = 1;
 506
 507                 if (!need_resched()) {
 508                         start_snooze = get_tb() +
 509                                 *smt_snooze_delay * tb_ticks_per_usec;
 510
 511                         while (!need_resched() && !cpu_is_offline(cpu)) {
 512                                 ppc64_runlatch_off();
 513
 514                                 /*
 515                                  * Go into low thread priority and possibly
 516                                  * low power mode.
 517                                  */
 518                                 HMT_low();
 519                                 HMT_very_low();
 520
 521                                 if (*smt_snooze_delay != 0 &&
 522                                     get_tb() > start_snooze) {
 523                                         HMT_medium();
 524                                         dedicated_idle_sleep(cpu);
 525                                 }
 526
 527                         }
 528
 529                         HMT_medium();
 530                 }
 531
 532                 lpaca->lppaca.idle = 0;
 533                 ppc64_runlatch_on();
 534
 535                 preempt_enable_no_resched();
 536                 schedule();
 537                 preempt_disable();
 538
 539                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 540                         cpu_die();
 541         }
 542 }
 543
 544 static void pseries_shared_idle(void)
 545 {
 546         struct paca_struct *lpaca = get_paca();
 547         unsigned int cpu = smp_processor_id();
 548
 549         while (1) {
 550                 /*
 551                  * Indicate to the HV that we are idle. Now would be
 552                  * a good time to find other work to dispatch.
 553                  */
 554                 lpaca->lppaca.idle = 1;
 555
 556                 while (!need_resched() && !cpu_is_offline(cpu)) {
 557                         local_irq_disable();
 558                         ppc64_runlatch_off();
 559
 560                         /*
 561                          * Yield the processor to the hypervisor.  We return if
 562                          * an external interrupt occurs (which are driven prior
 563                          * to returning here) or if a prod occurs from another
 564                          * processor. When returning here, external interrupts
 565                          * are enabled.
 566                          *
 567                          * Check need_resched() again with interrupts disabled
 568                          * to avoid a race.
 569                          */
 570                         if (!need_resched())
 571                                 cede_processor();
 572                         else
 573                                 local_irq_enable();
 574
 575                         HMT_medium();
 576                 }
 577
 578                 lpaca->lppaca.idle = 0;
 579                 ppc64_runlatch_on();
 580
 581                 preempt_enable_no_resched();
 582                 schedule();
 583                 preempt_disable();
 584
 585                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 586                         cpu_die();
 587         }
 588 }
 589
 590 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 591 {
 592         if (platform_is_lpar())
 593                 return PCI_PROBE_DEVTREE;
 594         return PCI_PROBE_NORMAL;
 595 }
 596
 597 #ifdef CONFIG_KEXEC
 598 static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
 599 {
 600         /* Don't risk a hypervisor call if we're crashing */
 601         if (!crash_shutdown) {
 602                 unsigned long vpa = __pa(&get_paca()->lppaca);
 603
 604                 if (unregister_vpa(hard_smp_processor_id(), vpa)) {
 605                         printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
 606                                         "failed\n", smp_processor_id(),
 607                                         hard_smp_processor_id());
 608                 }
 609         }
 610
 611         if (ppc64_interrupt_controller == IC_OPEN_PIC)
 612                 mpic_teardown_this_cpu(secondary);
 613         else
 614                 xics_teardown_cpu(secondary);
 615 }
 616 #endif
 617
 618 struct machdep_calls __initdata pSeries_md = {
 619         .probe                  = pSeries_probe,
 620         .setup_arch             = pSeries_setup_arch,
 621         .init_early             = pSeries_init_early,
 622         .show_cpuinfo           = pSeries_show_cpuinfo,
 623         .log_error              = pSeries_log_error,
 624         .pcibios_fixup          = pSeries_final_fixup,
 625         .pci_probe_mode         = pSeries_pci_probe_mode,
 626         .irq_bus_setup          = pSeries_irq_bus_setup,
 627         .restart                = rtas_restart,
 628         .power_off              = rtas_power_off,
 629         .halt                   = rtas_halt,
 630         .panic                  = rtas_os_term,
 631         .cpu_die                = pSeries_mach_cpu_die,
 632         .get_boot_time          = rtas_get_boot_time,
 633         .get_rtc_time           = rtas_get_rtc_time,
 634         .set_rtc_time           = rtas_set_rtc_time,
 635         .calibrate_decr         = generic_calibrate_decr,
 636         .progress               = rtas_progress,
 637         .check_legacy_ioport    = pSeries_check_legacy_ioport,
 638         .system_reset_exception = pSeries_system_reset_exception,
 639         .machine_check_exception = pSeries_machine_check_exception,
 640 #ifdef CONFIG_KEXEC
 641         .kexec_cpu_down         = pseries_kexec_cpu_down,
 642         .machine_kexec          = default_machine_kexec,
 643         .machine_kexec_prepare  = default_machine_kexec_prepare,
 644 #endif
 645 };