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/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 static void __init pSeries_init_mpic(void)
 122 {
 123         unsigned int *addrp;
 124         struct device_node *np;
 125         unsigned long intack = 0;
 126
 127         /* All ISUs are setup, complete initialization */
 128         mpic_init(pSeries_mpic);
 129
 130         /* Check what kind of cascade ACK we have */
 131         if (!(np = of_find_node_by_name(NULL, "pci"))
 132             || !(addrp = (unsigned int *)
 133                  get_property(np, "8259-interrupt-acknowledge", NULL)))
 134                 printk(KERN_ERR "Cannot find pci to get ack address\n");
 135         else
 136                 intack = addrp[prom_n_addr_cells(np)-1];
 137         of_node_put(np);
 138
 139         /* Setup the legacy interrupts & controller */
 140         i8259_init(intack, 0);
 141
 142         /* Hook cascade to mpic */
 143         mpic_setup_cascade(NUM_ISA_INTERRUPTS, i8259_irq_cascade, NULL);
 144 }
 145
 146 static void __init pSeries_setup_mpic(void)
 147 {
 148         unsigned int *opprop;
 149         unsigned long openpic_addr = 0;
 150         unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
 151         struct device_node *root;
 152         int irq_count;
 153
 154         /* Find the Open PIC if present */
 155         root = of_find_node_by_path("/");
 156         opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
 157         if (opprop != 0) {
 158                 int n = prom_n_addr_cells(root);
 159
 160                 for (openpic_addr = 0; n > 0; --n)
 161                         openpic_addr = (openpic_addr << 32) + *opprop++;
 162                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 163         }
 164         of_node_put(root);
 165
 166         BUG_ON(openpic_addr == 0);
 167
 168         /* Get the sense values from OF */
 169         prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
 170
 171         /* Setup the openpic driver */
 172         irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
 173         pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
 174                                   16, 16, irq_count, /* isu size, irq offset, irq count */
 175                                   NR_IRQS - 4, /* ipi offset */
 176                                   senses, irq_count, /* sense & sense size */
 177                                   " MPIC     ");
 178 }
 179
 180 static void pseries_lpar_enable_pmcs(void)
 181 {
 182         unsigned long set, reset;
 183
 184         power4_enable_pmcs();
 185
 186         set = 1UL << 63;
 187         reset = 0;
 188         plpar_hcall_norets(H_PERFMON, set, reset);
 189
 190         /* instruct hypervisor to maintain PMCs */
 191         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 192                 get_lppaca()->pmcregs_in_use = 1;
 193 }
 194
 195 static void __init pSeries_setup_arch(void)
 196 {
 197         /* Fixup ppc_md depending on the type of interrupt controller */
 198         if (ppc64_interrupt_controller == IC_OPEN_PIC) {
 199                 ppc_md.init_IRQ       = pSeries_init_mpic;
 200                 ppc_md.get_irq        = mpic_get_irq;
 201                 /* Allocate the mpic now, so that find_and_init_phbs() can
 202                  * fill the ISUs */
 203                 pSeries_setup_mpic();
 204         } else {
 205                 ppc_md.init_IRQ       = xics_init_IRQ;
 206                 ppc_md.get_irq        = xics_get_irq;
 207         }
 208
 209 #ifdef CONFIG_SMP
 210         smp_init_pSeries();
 211 #endif
 212         /* openpic global configuration register (64-bit format). */
 213         /* openpic Interrupt Source Unit pointer (64-bit format). */
 214         /* python0 facility area (mmio) (64-bit format) REAL address. */
 215
 216         /* init to some ~sane value until calibrate_delay() runs */
 217         loops_per_jiffy = 50000000;
 218
 219         if (ROOT_DEV == 0) {
 220                 printk("No ramdisk, default root is /dev/sda2\n");
 221                 ROOT_DEV = Root_SDA2;
 222         }
 223
 224         fwnmi_init();
 225
 226         /* Find and initialize PCI host bridges */
 227         init_pci_config_tokens();
 228         find_and_init_phbs();
 229         eeh_init();
 230
 231         pSeries_nvram_init();
 232
 233         /* Choose an idle loop */
 234         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 235                 vpa_init(boot_cpuid);
 236                 if (get_lppaca()->shared_proc) {
 237                         printk(KERN_DEBUG "Using shared processor idle loop\n");
 238                         ppc_md.power_save = pseries_shared_idle_sleep;
 239                 } else {
 240                         printk(KERN_DEBUG "Using dedicated idle loop\n");
 241                         ppc_md.power_save = pseries_dedicated_idle_sleep;
 242                 }
 243         } else {
 244                 printk(KERN_DEBUG "Using default idle loop\n");
 245         }
 246
 247         if (firmware_has_feature(FW_FEATURE_LPAR))
 248                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 249         else
 250                 ppc_md.enable_pmcs = power4_enable_pmcs;
 251 }
 252
 253 static int __init pSeries_init_panel(void)
 254 {
 255         /* Manually leave the kernel version on the panel. */
 256         ppc_md.progress("Linux ppc64\n", 0);
 257         ppc_md.progress(system_utsname.release, 0);
 258
 259         return 0;
 260 }
 261 arch_initcall(pSeries_init_panel);
 262
 263 static  void __init pSeries_discover_pic(void)
 264 {
 265         struct device_node *np;
 266         char *typep;
 267
 268         /*
 269          * Setup interrupt mapping options that are needed for finish_device_tree
 270          * to properly parse the OF interrupt tree & do the virtual irq mapping
 271          */
 272         __irq_offset_value = NUM_ISA_INTERRUPTS;
 273         ppc64_interrupt_controller = IC_INVALID;
 274         for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
 275                 typep = (char *)get_property(np, "compatible", NULL);
 276                 if (strstr(typep, "open-pic")) {
 277                         ppc64_interrupt_controller = IC_OPEN_PIC;
 278                         break;
 279                 } else if (strstr(typep, "ppc-xicp")) {
 280                         ppc64_interrupt_controller = IC_PPC_XIC;
 281                         break;
 282                 }
 283         }
 284         if (ppc64_interrupt_controller == IC_INVALID)
 285                 printk("pSeries_discover_pic: failed to recognize"
 286                         " interrupt-controller\n");
 287
 288 }
 289
 290 static void pSeries_mach_cpu_die(void)
 291 {
 292         local_irq_disable();
 293         idle_task_exit();
 294         /* Some hardware requires clearing the CPPR, while other hardware does not
 295          * it is safe either way
 296          */
 297         pSeriesLP_cppr_info(0, 0);
 298         rtas_stop_self();
 299         /* Should never get here... */
 300         BUG();
 301         for(;;);
 302 }
 303
 304 static int pseries_set_dabr(unsigned long dabr)
 305 {
 306         return plpar_hcall_norets(H_SET_DABR, dabr);
 307 }
 308
 309 static int pseries_set_xdabr(unsigned long dabr)
 310 {
 311         /* We want to catch accesses from kernel and userspace */
 312         return plpar_hcall_norets(H_SET_XDABR, dabr,
 313                         H_DABRX_KERNEL | H_DABRX_USER);
 314 }
 315
 316 /*
 317  * Early initialization.  Relocation is on but do not reference unbolted pages
 318  */
 319 static void __init pSeries_init_early(void)
 320 {
 321         DBG(" -> pSeries_init_early()\n");
 322
 323         fw_feature_init();
 324
 325         if (firmware_has_feature(FW_FEATURE_LPAR))
 326                 find_udbg_vterm();
 327
 328         if (firmware_has_feature(FW_FEATURE_DABR))
 329                 ppc_md.set_dabr = pseries_set_dabr;
 330         else if (firmware_has_feature(FW_FEATURE_XDABR))
 331                 ppc_md.set_dabr = pseries_set_xdabr;
 332
 333         iommu_init_early_pSeries();
 334
 335         pSeries_discover_pic();
 336
 337         DBG(" <- pSeries_init_early()\n");
 338 }
 339
 340
 341 static int pSeries_check_legacy_ioport(unsigned int baseport)
 342 {
 343         struct device_node *np;
 344
 345 #define I8042_DATA_REG  0x60
 346 #define FDC_BASE        0x3f0
 347
 348
 349         switch(baseport) {
 350         case I8042_DATA_REG:
 351                 np = of_find_node_by_type(NULL, "8042");
 352                 if (np == NULL)
 353                         return -ENODEV;
 354                 of_node_put(np);
 355                 break;
 356         case FDC_BASE:
 357                 np = of_find_node_by_type(NULL, "fdc");
 358                 if (np == NULL)
 359                         return -ENODEV;
 360                 of_node_put(np);
 361                 break;
 362         }
 363         return 0;
 364 }
 365
 366 /*
 367  * Called very early, MMU is off, device-tree isn't unflattened
 368  */
 369
 370 static int __init pSeries_probe_hypertas(unsigned long node,
 371                                          const char *uname, int depth,
 372                                          void *data)
 373 {
 374         if (depth != 1 ||
 375             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
 376                 return 0;
 377
 378         if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL) != NULL)
 379                 powerpc_firmware_features |= FW_FEATURE_LPAR;
 380
 381         if (firmware_has_feature(FW_FEATURE_LPAR))
 382                 hpte_init_lpar();
 383         else
 384                 hpte_init_native();
 385
 386         return 1;
 387 }
 388
 389 static int __init pSeries_probe(void)
 390 {
 391         unsigned long root = of_get_flat_dt_root();
 392         char *dtype = of_get_flat_dt_prop(of_get_flat_dt_root(),
 393                                           "device_type", NULL);
 394         if (dtype == NULL)
 395                 return 0;
 396         if (strcmp(dtype, "chrp"))
 397                 return 0;
 398
 399         /* Cell blades firmware claims to be chrp while it's not. Until this
 400          * is fixed, we need to avoid those here.
 401          */
 402         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 403             of_flat_dt_is_compatible(root, "IBM,CBEA"))
 404                 return 0;
 405
 406         DBG("pSeries detected, looking for LPAR capability...\n");
 407
 408         /* Now try to figure out if we are running on LPAR */
 409         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
 410
 411         DBG("Machine is%s LPAR !\n",
 412             (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
 413
 414         return 1;
 415 }
 416
 417
 418 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 419
 420 static void pseries_dedicated_idle_sleep(void)
 421 {
 422         unsigned int cpu = smp_processor_id();
 423         unsigned long start_snooze;
 424         unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
 425
 426         /*
 427          * Indicate to the HV that we are idle. Now would be
 428          * a good time to find other work to dispatch.
 429          */
 430         get_lppaca()->idle = 1;
 431
 432         /*
 433          * We come in with interrupts disabled, and need_resched()
 434          * has been checked recently.  If we should poll for a little
 435          * while, do so.
 436          */
 437         if (*smt_snooze_delay) {
 438                 start_snooze = get_tb() +
 439                         *smt_snooze_delay * tb_ticks_per_usec;
 440                 local_irq_enable();
 441                 set_thread_flag(TIF_POLLING_NRFLAG);
 442
 443                 while (get_tb() < start_snooze) {
 444                         if (need_resched() || cpu_is_offline(cpu))
 445                                 goto out;
 446                         ppc64_runlatch_off();
 447                         HMT_low();
 448                         HMT_very_low();
 449                 }
 450
 451                 HMT_medium();
 452                 clear_thread_flag(TIF_POLLING_NRFLAG);
 453                 smp_mb();
 454                 local_irq_disable();
 455                 if (need_resched() || cpu_is_offline(cpu))
 456                         goto out;
 457         }
 458
 459         /*
 460          * Cede if the other thread is not idle, so that it can
 461          * go single-threaded.  If the other thread is idle,
 462          * we ask the hypervisor if it has pending work it
 463          * wants to do and cede if it does.  Otherwise we keep
 464          * polling in order to reduce interrupt latency.
 465          *
 466          * Doing the cede when the other thread is active will
 467          * result in this thread going dormant, meaning the other
 468          * thread gets to run in single-threaded (ST) mode, which
 469          * is slightly faster than SMT mode with this thread at
 470          * very low priority.  The cede enables interrupts, which
 471          * doesn't matter here.
 472          */
 473         if (!lppaca[cpu ^ 1].idle || poll_pending() == H_PENDING)
 474                 cede_processor();
 475
 476 out:
 477         HMT_medium();
 478         get_lppaca()->idle = 0;
 479 }
 480
 481 static void pseries_shared_idle_sleep(void)
 482 {
 483         /*
 484          * Indicate to the HV that we are idle. Now would be
 485          * a good time to find other work to dispatch.
 486          */
 487         get_lppaca()->idle = 1;
 488
 489         /*
 490          * Yield the processor to the hypervisor.  We return if
 491          * an external interrupt occurs (which are driven prior
 492          * to returning here) or if a prod occurs from another
 493          * processor. When returning here, external interrupts
 494          * are enabled.
 495          */
 496         cede_processor();
 497
 498         get_lppaca()->idle = 0;
 499 }
 500
 501 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 502 {
 503         if (firmware_has_feature(FW_FEATURE_LPAR))
 504                 return PCI_PROBE_DEVTREE;
 505         return PCI_PROBE_NORMAL;
 506 }
 507
 508 #ifdef CONFIG_KEXEC
 509 static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
 510 {
 511         /* Don't risk a hypervisor call if we're crashing */
 512         if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
 513                 unsigned long vpa = __pa(get_lppaca());
 514
 515                 if (unregister_vpa(hard_smp_processor_id(), vpa)) {
 516                         printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
 517                                         "failed\n", smp_processor_id(),
 518                                         hard_smp_processor_id());
 519                 }
 520         }
 521
 522         if (ppc64_interrupt_controller == IC_OPEN_PIC)
 523                 mpic_teardown_this_cpu(secondary);
 524         else
 525                 xics_teardown_cpu(secondary);
 526 }
 527 #endif
 528
 529 define_machine(pseries) {
 530         .name                   = "pSeries",
 531         .probe                  = pSeries_probe,
 532         .setup_arch             = pSeries_setup_arch,
 533         .init_early             = pSeries_init_early,
 534         .show_cpuinfo           = pSeries_show_cpuinfo,
 535         .log_error              = pSeries_log_error,
 536         .pcibios_fixup          = pSeries_final_fixup,
 537         .pci_probe_mode         = pSeries_pci_probe_mode,
 538         .irq_bus_setup          = pSeries_irq_bus_setup,
 539         .restart                = rtas_restart,
 540         .power_off              = rtas_power_off,
 541         .halt                   = rtas_halt,
 542         .panic                  = rtas_os_term,
 543         .cpu_die                = pSeries_mach_cpu_die,
 544         .get_boot_time          = rtas_get_boot_time,
 545         .get_rtc_time           = rtas_get_rtc_time,
 546         .set_rtc_time           = rtas_set_rtc_time,
 547         .calibrate_decr         = generic_calibrate_decr,
 548         .progress               = rtas_progress,
 549         .check_legacy_ioport    = pSeries_check_legacy_ioport,
 550         .system_reset_exception = pSeries_system_reset_exception,
 551         .machine_check_exception = pSeries_machine_check_exception,
 552 #ifdef CONFIG_KEXEC
 553         .kexec_cpu_down         = pseries_kexec_cpu_down,
 554         .machine_kexec          = default_machine_kexec,
 555         .machine_kexec_prepare  = default_machine_kexec_prepare,
 556         .machine_crash_shutdown = default_machine_crash_shutdown,
 557 #endif
 558 };