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   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/time.h>
  60 #include <asm/nvram.h>
  61 #include "xics.h"
  62 #include <asm/firmware.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
  72 #ifdef DEBUG
  73 #define DBG(fmt...) udbg_printf(fmt)
  74 #else
  75 #define DBG(fmt...)
  76 #endif
  77
  78 extern void find_udbg_vterm(void);
  79 extern void system_reset_fwnmi(void);   /* from head.S */
  80 extern void machine_check_fwnmi(void);  /* from head.S */
  81 extern void generic_find_legacy_serial_ports(u64 *physport,
  82                 unsigned int *default_speed);
  83
  84 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  85
  86 extern void pSeries_system_reset_exception(struct pt_regs *regs);
  87 extern int pSeries_machine_check_exception(struct pt_regs *regs);
  88
  89 static void pseries_shared_idle(void);
  90 static void pseries_dedicated_idle(void);
  91
  92 struct mpic *pSeries_mpic;
  93
  94 void pSeries_show_cpuinfo(struct seq_file *m)
  95 {
  96         struct device_node *root;
  97         const char *model = "";
  98
  99         root = of_find_node_by_path("/");
 100         if (root)
 101                 model = get_property(root, "model", NULL);
 102         seq_printf(m, "machine\t\t: CHRP %s\n", model);
 103         of_node_put(root);
 104 }
 105
 106 /* Initialize firmware assisted non-maskable interrupts if
 107  * the firmware supports this feature.
 108  *
 109  */
 110 static void __init fwnmi_init(void)
 111 {
 112         int ret;
 113         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 114         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 115                 return;
 116         ret = rtas_call(ibm_nmi_register, 2, 1, NULL,
 117                         __pa((unsigned long)system_reset_fwnmi),
 118                         __pa((unsigned long)machine_check_fwnmi));
 119         if (ret == 0)
 120                 fwnmi_active = 1;
 121 }
 122
 123 static void __init pSeries_init_mpic(void)
 124 {
 125         unsigned int *addrp;
 126         struct device_node *np;
 127         unsigned long intack = 0;
 128
 129         /* All ISUs are setup, complete initialization */
 130         mpic_init(pSeries_mpic);
 131
 132         /* Check what kind of cascade ACK we have */
 133         if (!(np = of_find_node_by_name(NULL, "pci"))
 134             || !(addrp = (unsigned int *)
 135                  get_property(np, "8259-interrupt-acknowledge", NULL)))
 136                 printk(KERN_ERR "Cannot find pci to get ack address\n");
 137         else
 138                 intack = addrp[prom_n_addr_cells(np)-1];
 139         of_node_put(np);
 140
 141         /* Setup the legacy interrupts & controller */
 142         i8259_init(intack, 0);
 143
 144         /* Hook cascade to mpic */
 145         mpic_setup_cascade(NUM_ISA_INTERRUPTS, i8259_irq_cascade, NULL);
 146 }
 147
 148 static void __init pSeries_setup_mpic(void)
 149 {
 150         unsigned int *opprop;
 151         unsigned long openpic_addr = 0;
 152         unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
 153         struct device_node *root;
 154         int irq_count;
 155
 156         /* Find the Open PIC if present */
 157         root = of_find_node_by_path("/");
 158         opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
 159         if (opprop != 0) {
 160                 int n = prom_n_addr_cells(root);
 161
 162                 for (openpic_addr = 0; n > 0; --n)
 163                         openpic_addr = (openpic_addr << 32) + *opprop++;
 164                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 165         }
 166         of_node_put(root);
 167
 168         BUG_ON(openpic_addr == 0);
 169
 170         /* Get the sense values from OF */
 171         prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
 172
 173         /* Setup the openpic driver */
 174         irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
 175         pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
 176                                   16, 16, irq_count, /* isu size, irq offset, irq count */
 177                                   NR_IRQS - 4, /* ipi offset */
 178                                   senses, irq_count, /* sense & sense size */
 179                                   " MPIC     ");
 180 }
 181
 182 static void pseries_lpar_enable_pmcs(void)
 183 {
 184         unsigned long set, reset;
 185
 186         power4_enable_pmcs();
 187
 188         set = 1UL << 63;
 189         reset = 0;
 190         plpar_hcall_norets(H_PERFMON, set, reset);
 191
 192         /* instruct hypervisor to maintain PMCs */
 193         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 194                 get_paca()->lppaca.pmcregs_in_use = 1;
 195 }
 196
 197 static void __init pSeries_setup_arch(void)
 198 {
 199         /* Fixup ppc_md depending on the type of interrupt controller */
 200         if (ppc64_interrupt_controller == IC_OPEN_PIC) {
 201                 ppc_md.init_IRQ       = pSeries_init_mpic;
 202                 ppc_md.get_irq        = mpic_get_irq;
 203                 ppc_md.cpu_irq_down   = mpic_teardown_this_cpu;
 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                 ppc_md.cpu_irq_down   = xics_teardown_cpu;
 211         }
 212
 213 #ifdef CONFIG_SMP
 214         smp_init_pSeries();
 215 #endif
 216         /* openpic global configuration register (64-bit format). */
 217         /* openpic Interrupt Source Unit pointer (64-bit format). */
 218         /* python0 facility area (mmio) (64-bit format) REAL address. */
 219
 220         /* init to some ~sane value until calibrate_delay() runs */
 221         loops_per_jiffy = 50000000;
 222
 223         if (ROOT_DEV == 0) {
 224                 printk("No ramdisk, default root is /dev/sda2\n");
 225                 ROOT_DEV = Root_SDA2;
 226         }
 227
 228         fwnmi_init();
 229
 230         /* Find and initialize PCI host bridges */
 231         init_pci_config_tokens();
 232         find_and_init_phbs();
 233         eeh_init();
 234
 235         pSeries_nvram_init();
 236
 237         /* Choose an idle loop */
 238         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 239                 vpa_init(boot_cpuid);
 240                 if (get_paca()->lppaca.shared_proc) {
 241                         printk(KERN_INFO "Using shared processor idle loop\n");
 242                         ppc_md.idle_loop = pseries_shared_idle;
 243                 } else {
 244                         printk(KERN_INFO "Using dedicated idle loop\n");
 245                         ppc_md.idle_loop = pseries_dedicated_idle;
 246                 }
 247         } else {
 248                 printk(KERN_INFO "Using default idle loop\n");
 249                 ppc_md.idle_loop = default_idle;
 250         }
 251
 252         if (systemcfg->platform & PLATFORM_LPAR)
 253                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 254         else
 255                 ppc_md.enable_pmcs = power4_enable_pmcs;
 256 }
 257
 258 static int __init pSeries_init_panel(void)
 259 {
 260         /* Manually leave the kernel version on the panel. */
 261         ppc_md.progress("Linux ppc64\n", 0);
 262         ppc_md.progress(system_utsname.version, 0);
 263
 264         return 0;
 265 }
 266 arch_initcall(pSeries_init_panel);
 267
 268
 269 /* Build up the ppc64_firmware_features bitmask field
 270  * using contents of device-tree/ibm,hypertas-functions.
 271  * Ultimately this functionality may be moved into prom.c prom_init().
 272  */
 273 static void __init fw_feature_init(void)
 274 {
 275         struct device_node * dn;
 276         char * hypertas;
 277         unsigned int len;
 278
 279         DBG(" -> fw_feature_init()\n");
 280
 281         ppc64_firmware_features = 0;
 282         dn = of_find_node_by_path("/rtas");
 283         if (dn == NULL) {
 284                 printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n");
 285                 goto no_rtas;
 286         }
 287
 288         hypertas = get_property(dn, "ibm,hypertas-functions", &len);
 289         if (hypertas) {
 290                 while (len > 0){
 291                         int i, hypertas_len;
 292                         /* check value against table of strings */
 293                         for(i=0; i < FIRMWARE_MAX_FEATURES ;i++) {
 294                                 if ((firmware_features_table[i].name) &&
 295                                     (strcmp(firmware_features_table[i].name,hypertas))==0) {
 296                                         /* we have a match */
 297                                         ppc64_firmware_features |=
 298                                                 (firmware_features_table[i].val);
 299                                         break;
 300                                 }
 301                         }
 302                         hypertas_len = strlen(hypertas);
 303                         len -= hypertas_len +1;
 304                         hypertas+= hypertas_len +1;
 305                 }
 306         }
 307
 308         of_node_put(dn);
 309  no_rtas:
 310         printk(KERN_INFO "firmware_features = 0x%lx\n",
 311                ppc64_firmware_features);
 312
 313         DBG(" <- fw_feature_init()\n");
 314 }
 315
 316
 317 static  void __init pSeries_discover_pic(void)
 318 {
 319         struct device_node *np;
 320         char *typep;
 321
 322         /*
 323          * Setup interrupt mapping options that are needed for finish_device_tree
 324          * to properly parse the OF interrupt tree & do the virtual irq mapping
 325          */
 326         __irq_offset_value = NUM_ISA_INTERRUPTS;
 327         ppc64_interrupt_controller = IC_INVALID;
 328         for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
 329                 typep = (char *)get_property(np, "compatible", NULL);
 330                 if (strstr(typep, "open-pic"))
 331                         ppc64_interrupt_controller = IC_OPEN_PIC;
 332                 else if (strstr(typep, "ppc-xicp"))
 333                         ppc64_interrupt_controller = IC_PPC_XIC;
 334                 else
 335                         printk("pSeries_discover_pic: failed to recognize"
 336                                " interrupt-controller\n");
 337                 break;
 338         }
 339 }
 340
 341 static void pSeries_mach_cpu_die(void)
 342 {
 343         local_irq_disable();
 344         idle_task_exit();
 345         /* Some hardware requires clearing the CPPR, while other hardware does not
 346          * it is safe either way
 347          */
 348         pSeriesLP_cppr_info(0, 0);
 349         rtas_stop_self();
 350         /* Should never get here... */
 351         BUG();
 352         for(;;);
 353 }
 354
 355 static int pseries_set_dabr(unsigned long dabr)
 356 {
 357         return plpar_hcall_norets(H_SET_DABR, dabr);
 358 }
 359
 360 static int pseries_set_xdabr(unsigned long dabr)
 361 {
 362         /* We want to catch accesses from kernel and userspace */
 363         return plpar_hcall_norets(H_SET_XDABR, dabr,
 364                         H_DABRX_KERNEL | H_DABRX_USER);
 365 }
 366
 367 /*
 368  * Early initialization.  Relocation is on but do not reference unbolted pages
 369  */
 370 static void __init pSeries_init_early(void)
 371 {
 372         void *comport;
 373         int iommu_off = 0;
 374         unsigned int default_speed;
 375         u64 physport;
 376
 377         DBG(" -> pSeries_init_early()\n");
 378
 379         fw_feature_init();
 380
 381         if (systemcfg->platform & PLATFORM_LPAR)
 382                 hpte_init_lpar();
 383         else {
 384                 hpte_init_native();
 385                 iommu_off = (of_chosen &&
 386                              get_property(of_chosen, "linux,iommu-off", NULL));
 387         }
 388
 389         generic_find_legacy_serial_ports(&physport, &default_speed);
 390
 391         if (systemcfg->platform & PLATFORM_LPAR)
 392                 find_udbg_vterm();
 393         else if (physport) {
 394                 /* Map the uart for udbg. */
 395                 comport = (void *)ioremap(physport, 16);
 396                 udbg_init_uart(comport, default_speed);
 397
 398                 DBG("Hello World !\n");
 399         }
 400
 401         if (firmware_has_feature(FW_FEATURE_DABR))
 402                 ppc_md.set_dabr = pseries_set_dabr;
 403         else if (firmware_has_feature(FW_FEATURE_XDABR))
 404                 ppc_md.set_dabr = pseries_set_xdabr;
 405
 406         iommu_init_early_pSeries();
 407
 408         pSeries_discover_pic();
 409
 410         DBG(" <- pSeries_init_early()\n");
 411 }
 412
 413
 414 static int pSeries_check_legacy_ioport(unsigned int baseport)
 415 {
 416         struct device_node *np;
 417
 418 #define I8042_DATA_REG  0x60
 419 #define FDC_BASE        0x3f0
 420
 421
 422         switch(baseport) {
 423         case I8042_DATA_REG:
 424                 np = of_find_node_by_type(NULL, "8042");
 425                 if (np == NULL)
 426                         return -ENODEV;
 427                 of_node_put(np);
 428                 break;
 429         case FDC_BASE:
 430                 np = of_find_node_by_type(NULL, "fdc");
 431                 if (np == NULL)
 432                         return -ENODEV;
 433                 of_node_put(np);
 434                 break;
 435         }
 436         return 0;
 437 }
 438
 439 /*
 440  * Called very early, MMU is off, device-tree isn't unflattened
 441  */
 442 extern struct machdep_calls pSeries_md;
 443
 444 static int __init pSeries_probe(int platform)
 445 {
 446         if (platform != PLATFORM_PSERIES &&
 447             platform != PLATFORM_PSERIES_LPAR)
 448                 return 0;
 449
 450         /* if we have some ppc_md fixups for LPAR to do, do
 451          * it here ...
 452          */
 453
 454         return 1;
 455 }
 456
 457 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 458
 459 static inline void dedicated_idle_sleep(unsigned int cpu)
 460 {
 461         struct paca_struct *ppaca = &paca[cpu ^ 1];
 462
 463         /* Only sleep if the other thread is not idle */
 464         if (!(ppaca->lppaca.idle)) {
 465                 local_irq_disable();
 466
 467                 /*
 468                  * We are about to sleep the thread and so wont be polling any
 469                  * more.
 470                  */
 471                 clear_thread_flag(TIF_POLLING_NRFLAG);
 472                 smp_mb__after_clear_bit();
 473
 474                 /*
 475                  * SMT dynamic mode. Cede will result in this thread going
 476                  * dormant, if the partner thread is still doing work.  Thread
 477                  * wakes up if partner goes idle, an interrupt is presented, or
 478                  * a prod occurs.  Returning from the cede enables external
 479                  * interrupts.
 480                  */
 481                 if (!need_resched())
 482                         cede_processor();
 483                 else
 484                         local_irq_enable();
 485                 set_thread_flag(TIF_POLLING_NRFLAG);
 486         } else {
 487                 /*
 488                  * Give the HV an opportunity at the processor, since we are
 489                  * not doing any work.
 490                  */
 491                 poll_pending();
 492         }
 493 }
 494
 495 static void pseries_dedicated_idle(void)
 496 {
 497         struct paca_struct *lpaca = get_paca();
 498         unsigned int cpu = smp_processor_id();
 499         unsigned long start_snooze;
 500         unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
 501         set_thread_flag(TIF_POLLING_NRFLAG);
 502
 503         while (1) {
 504                 /*
 505                  * Indicate to the HV that we are idle. Now would be
 506                  * a good time to find other work to dispatch.
 507                  */
 508                 lpaca->lppaca.idle = 1;
 509
 510                 if (!need_resched()) {
 511                         start_snooze = __get_tb() +
 512                                 *smt_snooze_delay * tb_ticks_per_usec;
 513
 514                         while (!need_resched() && !cpu_is_offline(cpu)) {
 515                                 ppc64_runlatch_off();
 516
 517                                 /*
 518                                  * Go into low thread priority and possibly
 519                                  * low power mode.
 520                                  */
 521                                 HMT_low();
 522                                 HMT_very_low();
 523
 524                                 if (*smt_snooze_delay != 0 &&
 525                                     __get_tb() > start_snooze) {
 526                                         HMT_medium();
 527                                         dedicated_idle_sleep(cpu);
 528                                 }
 529
 530                         }
 531
 532                         HMT_medium();
 533                 }
 534
 535                 lpaca->lppaca.idle = 0;
 536                 ppc64_runlatch_on();
 537
 538                 preempt_enable_no_resched();
 539                 schedule();
 540                 preempt_disable();
 541
 542                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 543                         cpu_die();
 544         }
 545 }
 546
 547 static void pseries_shared_idle(void)
 548 {
 549         struct paca_struct *lpaca = get_paca();
 550         unsigned int cpu = smp_processor_id();
 551
 552         while (1) {
 553                 /*
 554                  * Indicate to the HV that we are idle. Now would be
 555                  * a good time to find other work to dispatch.
 556                  */
 557                 lpaca->lppaca.idle = 1;
 558
 559                 while (!need_resched() && !cpu_is_offline(cpu)) {
 560                         local_irq_disable();
 561                         ppc64_runlatch_off();
 562
 563                         /*
 564                          * Yield the processor to the hypervisor.  We return if
 565                          * an external interrupt occurs (which are driven prior
 566                          * to returning here) or if a prod occurs from another
 567                          * processor. When returning here, external interrupts
 568                          * are enabled.
 569                          *
 570                          * Check need_resched() again with interrupts disabled
 571                          * to avoid a race.
 572                          */
 573                         if (!need_resched())
 574                                 cede_processor();
 575                         else
 576                                 local_irq_enable();
 577
 578                         HMT_medium();
 579                 }
 580
 581                 lpaca->lppaca.idle = 0;
 582                 ppc64_runlatch_on();
 583
 584                 preempt_enable_no_resched();
 585                 schedule();
 586                 preempt_disable();
 587
 588                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 589                         cpu_die();
 590         }
 591 }
 592
 593 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 594 {
 595         if (systemcfg->platform & PLATFORM_LPAR)
 596                 return PCI_PROBE_DEVTREE;
 597         return PCI_PROBE_NORMAL;
 598 }
 599
 600 struct machdep_calls __initdata pSeries_md = {
 601         .probe                  = pSeries_probe,
 602         .setup_arch             = pSeries_setup_arch,
 603         .init_early             = pSeries_init_early,
 604         .show_cpuinfo           = pSeries_show_cpuinfo,
 605         .log_error              = pSeries_log_error,
 606         .pcibios_fixup          = pSeries_final_fixup,
 607         .pci_probe_mode         = pSeries_pci_probe_mode,
 608         .irq_bus_setup          = pSeries_irq_bus_setup,
 609         .restart                = rtas_restart,
 610         .power_off              = rtas_power_off,
 611         .halt                   = rtas_halt,
 612         .panic                  = rtas_os_term,
 613         .cpu_die                = pSeries_mach_cpu_die,
 614         .get_boot_time          = rtas_get_boot_time,
 615         .get_rtc_time           = rtas_get_rtc_time,
 616         .set_rtc_time           = rtas_set_rtc_time,
 617         .calibrate_decr         = generic_calibrate_decr,
 618         .progress               = rtas_progress,
 619         .check_legacy_ioport    = pSeries_check_legacy_ioport,
 620         .system_reset_exception = pSeries_system_reset_exception,
 621         .machine_check_exception = pSeries_machine_check_exception,
 622 };