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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/cpu.h>
  22 #include <linux/errno.h>
  23 #include <linux/sched.h>
  24 #include <linux/kernel.h>
  25 #include <linux/mm.h>
  26 #include <linux/stddef.h>
  27 #include <linux/unistd.h>
  28 #include <linux/slab.h>
  29 #include <linux/user.h>
  30 #include <linux/a.out.h>
  31 #include <linux/tty.h>
  32 #include <linux/major.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/reboot.h>
  35 #include <linux/init.h>
  36 #include <linux/ioport.h>
  37 #include <linux/console.h>
  38 #include <linux/pci.h>
  39 #include <linux/utsname.h>
  40 #include <linux/adb.h>
  41 #include <linux/module.h>
  42 #include <linux/delay.h>
  43 #include <linux/irq.h>
  44 #include <linux/seq_file.h>
  45 #include <linux/root_dev.h>
  46
  47 #include <asm/mmu.h>
  48 #include <asm/processor.h>
  49 #include <asm/io.h>
  50 #include <asm/pgtable.h>
  51 #include <asm/prom.h>
  52 #include <asm/rtas.h>
  53 #include <asm/pci-bridge.h>
  54 #include <asm/iommu.h>
  55 #include <asm/dma.h>
  56 #include <asm/machdep.h>
  57 #include <asm/irq.h>
  58 #include <asm/kexec.h>
  59 #include <asm/time.h>
  60 #include <asm/nvram.h>
  61 #include "xics.h"
  62 #include <asm/pmc.h>
  63 #include <asm/mpic.h>
  64 #include <asm/ppc-pci.h>
  65 #include <asm/i8259.h>
  66 #include <asm/udbg.h>
  67 #include <asm/smp.h>
  68
  69 #include "plpar_wrappers.h"
  70 #include "ras.h"
  71 #include "firmware.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 static void pseries_shared_idle_sleep(void);
  84 static void pseries_dedicated_idle_sleep(void);
  85
  86 struct mpic *pSeries_mpic;
  87
  88 static void pSeries_show_cpuinfo(struct seq_file *m)
  89 {
  90         struct device_node *root;
  91         const char *model = "";
  92
  93         root = of_find_node_by_path("/");
  94         if (root)
  95                 model = get_property(root, "model", NULL);
  96         seq_printf(m, "machine\t\t: CHRP %s\n", model);
  97         of_node_put(root);
  98 }
  99
 100 /* Initialize firmware assisted non-maskable interrupts if
 101  * the firmware supports this feature.
 102  */
 103 static void __init fwnmi_init(void)
 104 {
 105         unsigned long system_reset_addr, machine_check_addr;
 106
 107         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 108         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 109                 return;
 110
 111         /* If the kernel's not linked at zero we point the firmware at low
 112          * addresses anyway, and use a trampoline to get to the real code. */
 113         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
 114         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
 115
 116         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
 117                                 machine_check_addr))
 118                 fwnmi_active = 1;
 119 }
 120
 121 void pSeries_8259_cascade(unsigned int irq, struct irq_desc *desc,
 122                           struct pt_regs *regs)
 123 {
 124         unsigned int max = 100;
 125
 126         while(max--) {
 127                 int cascade_irq = i8259_irq(regs);
 128                 if (max == 99)
 129                         desc->chip->eoi(irq);
 130                 if (cascade_irq < 0)
 131                         break;
 132                 generic_handle_irq(cascade_irq, regs);
 133         };
 134 }
 135
 136 static void __init pSeries_init_mpic(void)
 137 {
 138         unsigned int *addrp;
 139         struct device_node *np;
 140         unsigned long intack = 0;
 141
 142         /* All ISUs are setup, complete initialization */
 143         mpic_init(pSeries_mpic);
 144
 145         /* Check what kind of cascade ACK we have */
 146         if (!(np = of_find_node_by_name(NULL, "pci"))
 147             || !(addrp = (unsigned int *)
 148                  get_property(np, "8259-interrupt-acknowledge", NULL)))
 149                 printk(KERN_ERR "Cannot find pci to get ack address\n");
 150         else
 151                 intack = addrp[prom_n_addr_cells(np)-1];
 152         of_node_put(np);
 153
 154         /* Setup the legacy interrupts & controller */
 155         i8259_init(intack, 0);
 156
 157         /* Hook cascade to mpic */
 158         set_irq_chained_handler(NUM_ISA_INTERRUPTS, pSeries_8259_cascade);
 159 }
 160
 161 static void __init pSeries_setup_mpic(void)
 162 {
 163         unsigned int *opprop;
 164         unsigned long openpic_addr = 0;
 165         unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
 166         struct device_node *root;
 167         int irq_count;
 168
 169         /* Find the Open PIC if present */
 170         root = of_find_node_by_path("/");
 171         opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
 172         if (opprop != 0) {
 173                 int n = prom_n_addr_cells(root);
 174
 175                 for (openpic_addr = 0; n > 0; --n)
 176                         openpic_addr = (openpic_addr << 32) + *opprop++;
 177                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 178         }
 179         of_node_put(root);
 180
 181         BUG_ON(openpic_addr == 0);
 182
 183         /* Get the sense values from OF */
 184         prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
 185
 186         /* Setup the openpic driver */
 187         irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
 188         pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
 189                                   16, 16, irq_count, /* isu size, irq offset, irq count */
 190                                   NR_IRQS - 4, /* ipi offset */
 191                                   senses, irq_count, /* sense & sense size */
 192                                   " MPIC     ");
 193 }
 194
 195 static void pseries_lpar_enable_pmcs(void)
 196 {
 197         unsigned long set, reset;
 198
 199         power4_enable_pmcs();
 200
 201         set = 1UL << 63;
 202         reset = 0;
 203         plpar_hcall_norets(H_PERFMON, set, reset);
 204
 205         /* instruct hypervisor to maintain PMCs */
 206         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 207                 get_lppaca()->pmcregs_in_use = 1;
 208 }
 209
 210 static void __init pSeries_setup_arch(void)
 211 {
 212         /* Fixup ppc_md depending on the type of interrupt controller */
 213         if (ppc64_interrupt_controller == IC_OPEN_PIC) {
 214                 ppc_md.init_IRQ       = pSeries_init_mpic;
 215                 ppc_md.get_irq        = mpic_get_irq;
 216                 /* Allocate the mpic now, so that find_and_init_phbs() can
 217                  * fill the ISUs */
 218                 pSeries_setup_mpic();
 219         } else
 220                 ppc_md.init_IRQ       = xics_init_IRQ;
 221
 222 #ifdef CONFIG_SMP
 223         smp_init_pSeries();
 224 #endif
 225         /* openpic global configuration register (64-bit format). */
 226         /* openpic Interrupt Source Unit pointer (64-bit format). */
 227         /* python0 facility area (mmio) (64-bit format) REAL address. */
 228
 229         /* init to some ~sane value until calibrate_delay() runs */
 230         loops_per_jiffy = 50000000;
 231
 232         if (ROOT_DEV == 0) {
 233                 printk("No ramdisk, default root is /dev/sda2\n");
 234                 ROOT_DEV = Root_SDA2;
 235         }
 236
 237         fwnmi_init();
 238
 239         /* Find and initialize PCI host bridges */
 240         init_pci_config_tokens();
 241         find_and_init_phbs();
 242         eeh_init();
 243
 244         pSeries_nvram_init();
 245
 246         /* Choose an idle loop */
 247         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 248                 vpa_init(boot_cpuid);
 249                 if (get_lppaca()->shared_proc) {
 250                         printk(KERN_DEBUG "Using shared processor idle loop\n");
 251                         ppc_md.power_save = pseries_shared_idle_sleep;
 252                 } else {
 253                         printk(KERN_DEBUG "Using dedicated idle loop\n");
 254                         ppc_md.power_save = pseries_dedicated_idle_sleep;
 255                 }
 256         } else {
 257                 printk(KERN_DEBUG "Using default idle loop\n");
 258         }
 259
 260         if (firmware_has_feature(FW_FEATURE_LPAR))
 261                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 262         else
 263                 ppc_md.enable_pmcs = power4_enable_pmcs;
 264 }
 265
 266 static int __init pSeries_init_panel(void)
 267 {
 268         /* Manually leave the kernel version on the panel. */
 269         ppc_md.progress("Linux ppc64\n", 0);
 270         ppc_md.progress(system_utsname.release, 0);
 271
 272         return 0;
 273 }
 274 arch_initcall(pSeries_init_panel);
 275
 276 static  void __init pSeries_discover_pic(void)
 277 {
 278         struct device_node *np;
 279         char *typep;
 280
 281         /*
 282          * Setup interrupt mapping options that are needed for finish_device_tree
 283          * to properly parse the OF interrupt tree & do the virtual irq mapping
 284          */
 285         __irq_offset_value = NUM_ISA_INTERRUPTS;
 286         ppc64_interrupt_controller = IC_INVALID;
 287         for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
 288                 typep = (char *)get_property(np, "compatible", NULL);
 289                 if (strstr(typep, "open-pic")) {
 290                         ppc64_interrupt_controller = IC_OPEN_PIC;
 291                         break;
 292                 } else if (strstr(typep, "ppc-xicp")) {
 293                         ppc64_interrupt_controller = IC_PPC_XIC;
 294                         break;
 295                 }
 296         }
 297         if (ppc64_interrupt_controller == IC_INVALID)
 298                 printk("pSeries_discover_pic: failed to recognize"
 299                         " interrupt-controller\n");
 300
 301 }
 302
 303 static void pSeries_mach_cpu_die(void)
 304 {
 305         local_irq_disable();
 306         idle_task_exit();
 307         xics_teardown_cpu(0);
 308         rtas_stop_self();
 309         /* Should never get here... */
 310         BUG();
 311         for(;;);
 312 }
 313
 314 static int pseries_set_dabr(unsigned long dabr)
 315 {
 316         return plpar_hcall_norets(H_SET_DABR, dabr);
 317 }
 318
 319 static int pseries_set_xdabr(unsigned long dabr)
 320 {
 321         /* We want to catch accesses from kernel and userspace */
 322         return plpar_hcall_norets(H_SET_XDABR, dabr,
 323                         H_DABRX_KERNEL | H_DABRX_USER);
 324 }
 325
 326 /*
 327  * Early initialization.  Relocation is on but do not reference unbolted pages
 328  */
 329 static void __init pSeries_init_early(void)
 330 {
 331         DBG(" -> pSeries_init_early()\n");
 332
 333         fw_feature_init();
 334
 335         if (firmware_has_feature(FW_FEATURE_LPAR))
 336                 find_udbg_vterm();
 337
 338         if (firmware_has_feature(FW_FEATURE_DABR))
 339                 ppc_md.set_dabr = pseries_set_dabr;
 340         else if (firmware_has_feature(FW_FEATURE_XDABR))
 341                 ppc_md.set_dabr = pseries_set_xdabr;
 342
 343         iommu_init_early_pSeries();
 344
 345         pSeries_discover_pic();
 346
 347         DBG(" <- pSeries_init_early()\n");
 348 }
 349
 350
 351 static int pSeries_check_legacy_ioport(unsigned int baseport)
 352 {
 353         struct device_node *np;
 354
 355 #define I8042_DATA_REG  0x60
 356 #define FDC_BASE        0x3f0
 357
 358
 359         switch(baseport) {
 360         case I8042_DATA_REG:
 361                 np = of_find_node_by_type(NULL, "8042");
 362                 if (np == NULL)
 363                         return -ENODEV;
 364                 of_node_put(np);
 365                 break;
 366         case FDC_BASE:
 367                 np = of_find_node_by_type(NULL, "fdc");
 368                 if (np == NULL)
 369                         return -ENODEV;
 370                 of_node_put(np);
 371                 break;
 372         }
 373         return 0;
 374 }
 375
 376 /*
 377  * Called very early, MMU is off, device-tree isn't unflattened
 378  */
 379
 380 static int __init pSeries_probe_hypertas(unsigned long node,
 381                                          const char *uname, int depth,
 382                                          void *data)
 383 {
 384         if (depth != 1 ||
 385             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
 386                 return 0;
 387
 388         if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL) != NULL)
 389                 powerpc_firmware_features |= FW_FEATURE_LPAR;
 390
 391         if (firmware_has_feature(FW_FEATURE_LPAR))
 392                 hpte_init_lpar();
 393         else
 394                 hpte_init_native();
 395
 396         return 1;
 397 }
 398
 399 static int __init pSeries_probe(void)
 400 {
 401         unsigned long root = of_get_flat_dt_root();
 402         char *dtype = of_get_flat_dt_prop(of_get_flat_dt_root(),
 403                                           "device_type", NULL);
 404         if (dtype == NULL)
 405                 return 0;
 406         if (strcmp(dtype, "chrp"))
 407                 return 0;
 408
 409         /* Cell blades firmware claims to be chrp while it's not. Until this
 410          * is fixed, we need to avoid those here.
 411          */
 412         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 413             of_flat_dt_is_compatible(root, "IBM,CBEA"))
 414                 return 0;
 415
 416         DBG("pSeries detected, looking for LPAR capability...\n");
 417
 418         /* Now try to figure out if we are running on LPAR */
 419         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
 420
 421         DBG("Machine is%s LPAR !\n",
 422             (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
 423
 424         return 1;
 425 }
 426
 427
 428 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 429
 430 static void pseries_dedicated_idle_sleep(void)
 431 {
 432         unsigned int cpu = smp_processor_id();
 433         unsigned long start_snooze;
 434         unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
 435
 436         /*
 437          * Indicate to the HV that we are idle. Now would be
 438          * a good time to find other work to dispatch.
 439          */
 440         get_lppaca()->idle = 1;
 441
 442         /*
 443          * We come in with interrupts disabled, and need_resched()
 444          * has been checked recently.  If we should poll for a little
 445          * while, do so.
 446          */
 447         if (*smt_snooze_delay) {
 448                 start_snooze = get_tb() +
 449                         *smt_snooze_delay * tb_ticks_per_usec;
 450                 local_irq_enable();
 451                 set_thread_flag(TIF_POLLING_NRFLAG);
 452
 453                 while (get_tb() < start_snooze) {
 454                         if (need_resched() || cpu_is_offline(cpu))
 455                                 goto out;
 456                         ppc64_runlatch_off();
 457                         HMT_low();
 458                         HMT_very_low();
 459                 }
 460
 461                 HMT_medium();
 462                 clear_thread_flag(TIF_POLLING_NRFLAG);
 463                 smp_mb();
 464                 local_irq_disable();
 465                 if (need_resched() || cpu_is_offline(cpu))
 466                         goto out;
 467         }
 468
 469         /*
 470          * Cede if the other thread is not idle, so that it can
 471          * go single-threaded.  If the other thread is idle,
 472          * we ask the hypervisor if it has pending work it
 473          * wants to do and cede if it does.  Otherwise we keep
 474          * polling in order to reduce interrupt latency.
 475          *
 476          * Doing the cede when the other thread is active will
 477          * result in this thread going dormant, meaning the other
 478          * thread gets to run in single-threaded (ST) mode, which
 479          * is slightly faster than SMT mode with this thread at
 480          * very low priority.  The cede enables interrupts, which
 481          * doesn't matter here.
 482          */
 483         if (!lppaca[cpu ^ 1].idle || poll_pending() == H_PENDING)
 484                 cede_processor();
 485
 486 out:
 487         HMT_medium();
 488         get_lppaca()->idle = 0;
 489 }
 490
 491 static void pseries_shared_idle_sleep(void)
 492 {
 493         /*
 494          * Indicate to the HV that we are idle. Now would be
 495          * a good time to find other work to dispatch.
 496          */
 497         get_lppaca()->idle = 1;
 498
 499         /*
 500          * Yield the processor to the hypervisor.  We return if
 501          * an external interrupt occurs (which are driven prior
 502          * to returning here) or if a prod occurs from another
 503          * processor. When returning here, external interrupts
 504          * are enabled.
 505          */
 506         cede_processor();
 507
 508         get_lppaca()->idle = 0;
 509 }
 510
 511 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 512 {
 513         if (firmware_has_feature(FW_FEATURE_LPAR))
 514                 return PCI_PROBE_DEVTREE;
 515         return PCI_PROBE_NORMAL;
 516 }
 517
 518 #ifdef CONFIG_KEXEC
 519 static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
 520 {
 521         /* Don't risk a hypervisor call if we're crashing */
 522         if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
 523                 unsigned long vpa = __pa(get_lppaca());
 524
 525                 if (unregister_vpa(hard_smp_processor_id(), vpa)) {
 526                         printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
 527                                         "failed\n", smp_processor_id(),
 528                                         hard_smp_processor_id());
 529                 }
 530         }
 531
 532         if (ppc64_interrupt_controller == IC_OPEN_PIC)
 533                 mpic_teardown_this_cpu(secondary);
 534         else
 535                 xics_teardown_cpu(secondary);
 536 }
 537 #endif
 538
 539 define_machine(pseries) {
 540         .name                   = "pSeries",
 541         .probe                  = pSeries_probe,
 542         .setup_arch             = pSeries_setup_arch,
 543         .init_early             = pSeries_init_early,
 544         .show_cpuinfo           = pSeries_show_cpuinfo,
 545         .log_error              = pSeries_log_error,
 546         .pcibios_fixup          = pSeries_final_fixup,
 547         .pci_probe_mode         = pSeries_pci_probe_mode,
 548         .irq_bus_setup          = pSeries_irq_bus_setup,
 549         .restart                = rtas_restart,
 550         .power_off              = rtas_power_off,
 551         .halt                   = rtas_halt,
 552         .panic                  = rtas_os_term,
 553         .cpu_die                = pSeries_mach_cpu_die,
 554         .get_boot_time          = rtas_get_boot_time,
 555         .get_rtc_time           = rtas_get_rtc_time,
 556         .set_rtc_time           = rtas_set_rtc_time,
 557         .calibrate_decr         = generic_calibrate_decr,
 558         .progress               = rtas_progress,
 559         .check_legacy_ioport    = pSeries_check_legacy_ioport,
 560         .system_reset_exception = pSeries_system_reset_exception,
 561         .machine_check_exception = pSeries_machine_check_exception,
 562 #ifdef CONFIG_KEXEC
 563         .kexec_cpu_down         = pseries_kexec_cpu_down,
 564         .machine_kexec          = default_machine_kexec,
 565         .machine_kexec_prepare  = default_machine_kexec_prepare,
 566         .machine_crash_shutdown = default_machine_crash_shutdown,
 567 #endif
 568 };