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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/time.h>
  59 #include <asm/nvram.h>
  60 #include "xics.h"
  61 #include <asm/pmc.h>
  62 #include <asm/mpic.h>
  63 #include <asm/ppc-pci.h>
  64 #include <asm/i8259.h>
  65 #include <asm/udbg.h>
  66 #include <asm/smp.h>
  67 #include <asm/firmware.h>
  68 #include <asm/eeh.h>
  69
  70 #include "plpar_wrappers.h"
  71 #include "pseries.h"
  72
  73 #ifdef DEBUG
  74 #define DBG(fmt...) udbg_printf(fmt)
  75 #else
  76 #define DBG(fmt...)
  77 #endif
  78
  79 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  80
  81 static void pseries_shared_idle_sleep(void);
  82 static void pseries_dedicated_idle_sleep(void);
  83
  84 static struct device_node *pSeries_mpic_node;
  85
  86 static void pSeries_show_cpuinfo(struct seq_file *m)
  87 {
  88         struct device_node *root;
  89         const char *model = "";
  90
  91         root = of_find_node_by_path("/");
  92         if (root)
  93                 model = of_get_property(root, "model", NULL);
  94         seq_printf(m, "machine\t\t: CHRP %s\n", model);
  95         of_node_put(root);
  96 }
  97
  98 /* Initialize firmware assisted non-maskable interrupts if
  99  * the firmware supports this feature.
 100  */
 101 static void __init fwnmi_init(void)
 102 {
 103         unsigned long system_reset_addr, machine_check_addr;
 104
 105         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 106         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 107                 return;
 108
 109         /* If the kernel's not linked at zero we point the firmware at low
 110          * addresses anyway, and use a trampoline to get to the real code. */
 111         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
 112         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
 113
 114         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
 115                                 machine_check_addr))
 116                 fwnmi_active = 1;
 117 }
 118
 119 void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
 120 {
 121         unsigned int cascade_irq = i8259_irq();
 122         if (cascade_irq != NO_IRQ)
 123                 generic_handle_irq(cascade_irq);
 124         desc->chip->eoi(irq);
 125 }
 126
 127 static void __init pseries_setup_i8259_cascade(void)
 128 {
 129         struct device_node *np, *old, *found = NULL;
 130         unsigned int cascade;
 131         const u32 *addrp;
 132         unsigned long intack = 0;
 133         int naddr;
 134
 135         for_each_node_by_type(np, "interrupt-controller") {
 136                 if (of_device_is_compatible(np, "chrp,iic")) {
 137                         found = np;
 138                         break;
 139                 }
 140         }
 141
 142         if (found == NULL) {
 143                 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
 144                 return;
 145         }
 146
 147         cascade = irq_of_parse_and_map(found, 0);
 148         if (cascade == NO_IRQ) {
 149                 printk(KERN_ERR "pic: failed to map cascade interrupt");
 150                 return;
 151         }
 152         pr_debug("pic: cascade mapped to irq %d\n", cascade);
 153
 154         for (old = of_node_get(found); old != NULL ; old = np) {
 155                 np = of_get_parent(old);
 156                 of_node_put(old);
 157                 if (np == NULL)
 158                         break;
 159                 if (strcmp(np->name, "pci") != 0)
 160                         continue;
 161                 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
 162                 if (addrp == NULL)
 163                         continue;
 164                 naddr = of_n_addr_cells(np);
 165                 intack = addrp[naddr-1];
 166                 if (naddr > 1)
 167                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
 168         }
 169         if (intack)
 170                 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
 171         i8259_init(found, intack);
 172         of_node_put(found);
 173         set_irq_chained_handler(cascade, pseries_8259_cascade);
 174 }
 175
 176 static void __init pseries_mpic_init_IRQ(void)
 177 {
 178         struct device_node *np, *old, *cascade = NULL;
 179         const unsigned int *addrp;
 180         unsigned long intack = 0;
 181         const unsigned int *opprop;
 182         unsigned long openpic_addr = 0;
 183         unsigned int cascade_irq;
 184         int naddr, n, i, opplen;
 185         struct mpic *mpic;
 186
 187         np = of_find_node_by_path("/");
 188         naddr = of_n_addr_cells(np);
 189         opprop = of_get_property(np, "platform-open-pic", &opplen);
 190         if (opprop != 0) {
 191                 openpic_addr = of_read_number(opprop, naddr);
 192                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 193         }
 194         of_node_put(np);
 195
 196         BUG_ON(openpic_addr == 0);
 197
 198         /* Setup the openpic driver */
 199         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
 200                           MPIC_PRIMARY,
 201                           16, 250, /* isu size, irq count */
 202                           " MPIC     ");
 203         BUG_ON(mpic == NULL);
 204
 205         /* Add ISUs */
 206         opplen /= sizeof(u32);
 207         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 208                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
 209                 mpic_assign_isu(mpic, n, isuaddr);
 210         }
 211
 212         /* All ISUs are setup, complete initialization */
 213         mpic_init(mpic);
 214
 215         /* Look for cascade */
 216         for_each_node_by_type(np, "interrupt-controller")
 217                 if (of_device_is_compatible(np, "chrp,iic")) {
 218                         cascade = np;
 219                         break;
 220                 }
 221         if (cascade == NULL)
 222                 return;
 223
 224         cascade_irq = irq_of_parse_and_map(cascade, 0);
 225         if (cascade_irq == NO_IRQ) {
 226                 printk(KERN_ERR "mpic: failed to map cascade interrupt");
 227                 return;
 228         }
 229
 230         /* Check ACK type */
 231         for (old = of_node_get(cascade); old != NULL ; old = np) {
 232                 np = of_get_parent(old);
 233                 of_node_put(old);
 234                 if (np == NULL)
 235                         break;
 236                 if (strcmp(np->name, "pci") != 0)
 237                         continue;
 238                 addrp = of_get_property(np, "8259-interrupt-acknowledge",
 239                                             NULL);
 240                 if (addrp == NULL)
 241                         continue;
 242                 naddr = of_n_addr_cells(np);
 243                 intack = addrp[naddr-1];
 244                 if (naddr > 1)
 245                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
 246         }
 247         if (intack)
 248                 printk(KERN_DEBUG "mpic: PCI 8259 intack at 0x%016lx\n",
 249                        intack);
 250         i8259_init(cascade, intack);
 251         of_node_put(cascade);
 252         set_irq_chained_handler(cascade_irq, pseries_8259_cascade);
 253 }
 254
 255 static void __init pseries_xics_init_IRQ(void)
 256 {
 257         xics_init_IRQ();
 258         pseries_setup_i8259_cascade();
 259 }
 260
 261 static void pseries_lpar_enable_pmcs(void)
 262 {
 263         unsigned long set, reset;
 264
 265         set = 1UL << 63;
 266         reset = 0;
 267         plpar_hcall_norets(H_PERFMON, set, reset);
 268
 269         /* instruct hypervisor to maintain PMCs */
 270         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 271                 get_lppaca()->pmcregs_in_use = 1;
 272 }
 273
 274 static void __init pseries_discover_pic(void)
 275 {
 276         struct device_node *np;
 277         const char *typep;
 278
 279         for (np = NULL; (np = of_find_node_by_name(np,
 280                                                    "interrupt-controller"));) {
 281                 typep = of_get_property(np, "compatible", NULL);
 282                 if (strstr(typep, "open-pic")) {
 283                         pSeries_mpic_node = of_node_get(np);
 284                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
 285                         ppc_md.get_irq        = mpic_get_irq;
 286                         setup_kexec_cpu_down_mpic();
 287                         smp_init_pseries_mpic();
 288                         return;
 289                 } else if (strstr(typep, "ppc-xicp")) {
 290                         ppc_md.init_IRQ       = pseries_xics_init_IRQ;
 291                         setup_kexec_cpu_down_xics();
 292                         smp_init_pseries_xics();
 293                         return;
 294                 }
 295         }
 296         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
 297                " interrupt-controller\n");
 298 }
 299
 300 static void __init pSeries_setup_arch(void)
 301 {
 302         /* Discover PIC type and setup ppc_md accordingly */
 303         pseries_discover_pic();
 304
 305         /* openpic global configuration register (64-bit format). */
 306         /* openpic Interrupt Source Unit pointer (64-bit format). */
 307         /* python0 facility area (mmio) (64-bit format) REAL address. */
 308
 309         /* init to some ~sane value until calibrate_delay() runs */
 310         loops_per_jiffy = 50000000;
 311
 312         fwnmi_init();
 313
 314         /* Find and initialize PCI host bridges */
 315         init_pci_config_tokens();
 316         find_and_init_phbs();
 317         eeh_init();
 318
 319         pSeries_nvram_init();
 320
 321         /* Choose an idle loop */
 322         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 323                 vpa_init(boot_cpuid);
 324                 if (get_lppaca()->shared_proc) {
 325                         printk(KERN_DEBUG "Using shared processor idle loop\n");
 326                         ppc_md.power_save = pseries_shared_idle_sleep;
 327                 } else {
 328                         printk(KERN_DEBUG "Using dedicated idle loop\n");
 329                         ppc_md.power_save = pseries_dedicated_idle_sleep;
 330                 }
 331         } else {
 332                 printk(KERN_DEBUG "Using default idle loop\n");
 333         }
 334
 335         if (firmware_has_feature(FW_FEATURE_LPAR))
 336                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 337         else
 338                 ppc_md.enable_pmcs = power4_enable_pmcs;
 339 }
 340
 341 static int __init pSeries_init_panel(void)
 342 {
 343         /* Manually leave the kernel version on the panel. */
 344         ppc_md.progress("Linux ppc64\n", 0);
 345         ppc_md.progress(init_utsname()->version, 0);
 346
 347         return 0;
 348 }
 349 arch_initcall(pSeries_init_panel);
 350
 351 static int pseries_set_dabr(unsigned long dabr)
 352 {
 353         return plpar_hcall_norets(H_SET_DABR, dabr);
 354 }
 355
 356 static int pseries_set_xdabr(unsigned long dabr)
 357 {
 358         /* We want to catch accesses from kernel and userspace */
 359         return plpar_hcall_norets(H_SET_XDABR, dabr,
 360                         H_DABRX_KERNEL | H_DABRX_USER);
 361 }
 362
 363 /*
 364  * Early initialization.  Relocation is on but do not reference unbolted pages
 365  */
 366 static void __init pSeries_init_early(void)
 367 {
 368         DBG(" -> pSeries_init_early()\n");
 369
 370         if (firmware_has_feature(FW_FEATURE_LPAR))
 371                 find_udbg_vterm();
 372
 373         if (firmware_has_feature(FW_FEATURE_DABR))
 374                 ppc_md.set_dabr = pseries_set_dabr;
 375         else if (firmware_has_feature(FW_FEATURE_XDABR))
 376                 ppc_md.set_dabr = pseries_set_xdabr;
 377
 378         iommu_init_early_pSeries();
 379
 380         DBG(" <- pSeries_init_early()\n");
 381 }
 382
 383 /*
 384  * Called very early, MMU is off, device-tree isn't unflattened
 385  */
 386
 387 static int __init pSeries_probe_hypertas(unsigned long node,
 388                                          const char *uname, int depth,
 389                                          void *data)
 390 {
 391         const char *hypertas;
 392         unsigned long len;
 393
 394         if (depth != 1 ||
 395             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
 396                 return 0;
 397
 398         hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
 399         if (!hypertas)
 400                 return 1;
 401
 402         powerpc_firmware_features |= FW_FEATURE_LPAR;
 403         fw_feature_init(hypertas, len);
 404
 405         return 1;
 406 }
 407
 408 static int __init pSeries_probe(void)
 409 {
 410         unsigned long root = of_get_flat_dt_root();
 411         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
 412
 413         if (dtype == NULL)
 414                 return 0;
 415         if (strcmp(dtype, "chrp"))
 416                 return 0;
 417
 418         /* Cell blades firmware claims to be chrp while it's not. Until this
 419          * is fixed, we need to avoid those here.
 420          */
 421         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 422             of_flat_dt_is_compatible(root, "IBM,CBEA"))
 423                 return 0;
 424
 425         DBG("pSeries detected, looking for LPAR capability...\n");
 426
 427         /* Now try to figure out if we are running on LPAR */
 428         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
 429
 430         if (firmware_has_feature(FW_FEATURE_LPAR))
 431                 hpte_init_lpar();
 432         else
 433                 hpte_init_native();
 434
 435         DBG("Machine is%s LPAR !\n",
 436             (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
 437
 438         return 1;
 439 }
 440
 441
 442 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 443
 444 static void pseries_dedicated_idle_sleep(void)
 445 {
 446         unsigned int cpu = smp_processor_id();
 447         unsigned long start_snooze;
 448         unsigned long in_purr, out_purr;
 449
 450         /*
 451          * Indicate to the HV that we are idle. Now would be
 452          * a good time to find other work to dispatch.
 453          */
 454         get_lppaca()->idle = 1;
 455         get_lppaca()->donate_dedicated_cpu = 1;
 456         in_purr = mfspr(SPRN_PURR);
 457
 458         /*
 459          * We come in with interrupts disabled, and need_resched()
 460          * has been checked recently.  If we should poll for a little
 461          * while, do so.
 462          */
 463         if (__get_cpu_var(smt_snooze_delay)) {
 464                 start_snooze = get_tb() +
 465                         __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
 466                 local_irq_enable();
 467                 set_thread_flag(TIF_POLLING_NRFLAG);
 468
 469                 while (get_tb() < start_snooze) {
 470                         if (need_resched() || cpu_is_offline(cpu))
 471                                 goto out;
 472                         ppc64_runlatch_off();
 473                         HMT_low();
 474                         HMT_very_low();
 475                 }
 476
 477                 HMT_medium();
 478                 clear_thread_flag(TIF_POLLING_NRFLAG);
 479                 smp_mb();
 480                 local_irq_disable();
 481                 if (need_resched() || cpu_is_offline(cpu))
 482                         goto out;
 483         }
 484
 485         cede_processor();
 486
 487 out:
 488         HMT_medium();
 489         out_purr = mfspr(SPRN_PURR);
 490         get_lppaca()->wait_state_cycles += out_purr - in_purr;
 491         get_lppaca()->donate_dedicated_cpu = 0;
 492         get_lppaca()->idle = 0;
 493 }
 494
 495 static void pseries_shared_idle_sleep(void)
 496 {
 497         /*
 498          * Indicate to the HV that we are idle. Now would be
 499          * a good time to find other work to dispatch.
 500          */
 501         get_lppaca()->idle = 1;
 502
 503         /*
 504          * Yield the processor to the hypervisor.  We return if
 505          * an external interrupt occurs (which are driven prior
 506          * to returning here) or if a prod occurs from another
 507          * processor. When returning here, external interrupts
 508          * are enabled.
 509          */
 510         cede_processor();
 511
 512         get_lppaca()->idle = 0;
 513 }
 514
 515 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 516 {
 517         if (firmware_has_feature(FW_FEATURE_LPAR))
 518                 return PCI_PROBE_DEVTREE;
 519         return PCI_PROBE_NORMAL;
 520 }
 521
 522 /**
 523  * pSeries_power_off - tell firmware about how to power off the system.
 524  *
 525  * This function calls either the power-off rtas token in normal cases
 526  * or the ibm,power-off-ups token (if present & requested) in case of
 527  * a power failure. If power-off token is used, power on will only be
 528  * possible with power button press. If ibm,power-off-ups token is used
 529  * it will allow auto poweron after power is restored.
 530  */
 531 void pSeries_power_off(void)
 532 {
 533         int rc;
 534         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
 535
 536         if (rtas_flash_term_hook)
 537                 rtas_flash_term_hook(SYS_POWER_OFF);
 538
 539         if (rtas_poweron_auto == 0 ||
 540                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
 541                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
 542                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
 543         } else {
 544                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
 545                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
 546         }
 547         for (;;);
 548 }
 549
 550 #ifndef CONFIG_PCI
 551 void pSeries_final_fixup(void) { }
 552 #endif
 553
 554 define_machine(pseries) {
 555         .name                   = "pSeries",
 556         .probe                  = pSeries_probe,
 557         .setup_arch             = pSeries_setup_arch,
 558         .init_early             = pSeries_init_early,
 559         .show_cpuinfo           = pSeries_show_cpuinfo,
 560         .log_error              = pSeries_log_error,
 561         .pcibios_fixup          = pSeries_final_fixup,
 562         .pci_probe_mode         = pSeries_pci_probe_mode,
 563         .restart                = rtas_restart,
 564         .power_off              = pSeries_power_off,
 565         .halt                   = rtas_halt,
 566         .panic                  = rtas_os_term,
 567         .get_boot_time          = rtas_get_boot_time,
 568         .get_rtc_time           = rtas_get_rtc_time,
 569         .set_rtc_time           = rtas_set_rtc_time,
 570         .calibrate_decr         = generic_calibrate_decr,
 571         .progress               = rtas_progress,
 572         .system_reset_exception = pSeries_system_reset_exception,
 573         .machine_check_exception = pSeries_machine_check_exception,
 574 };