arch/ppc64/kernel/pSeries_setup.c

   1 /*
   2  *  linux/arch/ppc/kernel/setup.c
   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 <asm/plpar_wrappers.h>
  62 #include <asm/xics.h>
  63 #include <asm/firmware.h>
  64 #include <asm/pmc.h>
  65
  66 #include "i8259.h"
  67 #include "mpic.h"
  68 #include "pci.h"
  69
  70 #ifdef DEBUG
  71 #define DBG(fmt...) udbg_printf(fmt)
  72 #else
  73 #define DBG(fmt...)
  74 #endif
  75
  76 extern void find_udbg_vterm(void);
  77 extern void system_reset_fwnmi(void);   /* from head.S */
  78 extern void machine_check_fwnmi(void);  /* from head.S */
  79 extern void generic_find_legacy_serial_ports(u64 *physport,
  80                 unsigned int *default_speed);
  81
  82 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  83
  84 extern void pSeries_system_reset_exception(struct pt_regs *regs);
  85 extern int pSeries_machine_check_exception(struct pt_regs *regs);
  86
  87 static int pseries_shared_idle(void);
  88 static int pseries_dedicated_idle(void);
  89
  90 static volatile void __iomem * chrp_int_ack_special;
  91 struct mpic *pSeries_mpic;
  92
  93 void pSeries_get_cpuinfo(struct seq_file *m)
  94 {
  95         struct device_node *root;
  96         const char *model = "";
  97
  98         root = of_find_node_by_path("/");
  99         if (root)
 100                 model = get_property(root, "model", NULL);
 101         seq_printf(m, "machine\t\t: CHRP %s\n", model);
 102         of_node_put(root);
 103 }
 104
 105 /* Initialize firmware assisted non-maskable interrupts if
 106  * the firmware supports this feature.
 107  *
 108  */
 109 static void __init fwnmi_init(void)
 110 {
 111         int ret;
 112         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 113         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 114                 return;
 115         ret = rtas_call(ibm_nmi_register, 2, 1, NULL,
 116                         __pa((unsigned long)system_reset_fwnmi),
 117                         __pa((unsigned long)machine_check_fwnmi));
 118         if (ret == 0)
 119                 fwnmi_active = 1;
 120 }
 121
 122 static int pSeries_irq_cascade(struct pt_regs *regs, void *data)
 123 {
 124         if (chrp_int_ack_special)
 125                 return readb(chrp_int_ack_special);
 126         else
 127                 return i8259_irq(smp_processor_id());
 128 }
 129
 130 static void __init pSeries_init_mpic(void)
 131 {
 132         unsigned int *addrp;
 133         struct device_node *np;
 134         int i;
 135
 136         /* All ISUs are setup, complete initialization */
 137         mpic_init(pSeries_mpic);
 138
 139         /* Check what kind of cascade ACK we have */
 140         if (!(np = of_find_node_by_name(NULL, "pci"))
 141             || !(addrp = (unsigned int *)
 142                  get_property(np, "8259-interrupt-acknowledge", NULL)))
 143                 printk(KERN_ERR "Cannot find pci to get ack address\n");
 144         else
 145                 chrp_int_ack_special = ioremap(addrp[prom_n_addr_cells(np)-1], 1);
 146         of_node_put(np);
 147
 148         /* Setup the legacy interrupts & controller */
 149         for (i = 0; i < NUM_ISA_INTERRUPTS; i++)
 150                 irq_desc[i].handler = &i8259_pic;
 151         i8259_init(0);
 152
 153         /* Hook cascade to mpic */
 154         mpic_setup_cascade(NUM_ISA_INTERRUPTS, pSeries_irq_cascade, NULL);
 155 }
 156
 157 static void __init pSeries_setup_mpic(void)
 158 {
 159         unsigned int *opprop;
 160         unsigned long openpic_addr = 0;
 161         unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
 162         struct device_node *root;
 163         int irq_count;
 164
 165         /* Find the Open PIC if present */
 166         root = of_find_node_by_path("/");
 167         opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
 168         if (opprop != 0) {
 169                 int n = prom_n_addr_cells(root);
 170
 171                 for (openpic_addr = 0; n > 0; --n)
 172                         openpic_addr = (openpic_addr << 32) + *opprop++;
 173                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 174         }
 175         of_node_put(root);
 176
 177         BUG_ON(openpic_addr == 0);
 178
 179         /* Get the sense values from OF */
 180         prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
 181
 182         /* Setup the openpic driver */
 183         irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
 184         pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
 185                                   16, 16, irq_count, /* isu size, irq offset, irq count */
 186                                   NR_IRQS - 4, /* ipi offset */
 187                                   senses, irq_count, /* sense & sense size */
 188                                   " MPIC     ");
 189 }
 190
 191 static void pseries_lpar_enable_pmcs(void)
 192 {
 193         unsigned long set, reset;
 194
 195         power4_enable_pmcs();
 196
 197         set = 1UL << 63;
 198         reset = 0;
 199         plpar_hcall_norets(H_PERFMON, set, reset);
 200
 201         /* instruct hypervisor to maintain PMCs */
 202         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 203                 get_paca()->lppaca.pmcregs_in_use = 1;
 204 }
 205
 206 static void __init pSeries_setup_arch(void)
 207 {
 208         /* Fixup ppc_md depending on the type of interrupt controller */
 209         if (ppc64_interrupt_controller == IC_OPEN_PIC) {
 210                 ppc_md.init_IRQ       = pSeries_init_mpic;
 211                 ppc_md.get_irq        = mpic_get_irq;
 212                 ppc_md.cpu_irq_down   = mpic_teardown_this_cpu;
 213                 /* Allocate the mpic now, so that find_and_init_phbs() can
 214                  * fill the ISUs */
 215                 pSeries_setup_mpic();
 216         } else {
 217                 ppc_md.init_IRQ       = xics_init_IRQ;
 218                 ppc_md.get_irq        = xics_get_irq;
 219                 ppc_md.cpu_irq_down   = xics_teardown_cpu;
 220         }
 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         eeh_init();
 242         find_and_init_phbs();
 243
 244 #ifdef CONFIG_DUMMY_CONSOLE
 245         conswitchp = &dummy_con;
 246 #endif
 247
 248         pSeries_nvram_init();
 249
 250         /* Choose an idle loop */
 251         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 252                 vpa_init(boot_cpuid);
 253                 if (get_paca()->lppaca.shared_proc) {
 254                         printk(KERN_INFO "Using shared processor idle loop\n");
 255                         ppc_md.idle_loop = pseries_shared_idle;
 256                 } else {
 257                         printk(KERN_INFO "Using dedicated idle loop\n");
 258                         ppc_md.idle_loop = pseries_dedicated_idle;
 259                 }
 260         } else {
 261                 printk(KERN_INFO "Using default idle loop\n");
 262                 ppc_md.idle_loop = default_idle;
 263         }
 264
 265         if (systemcfg->platform & PLATFORM_LPAR)
 266                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 267         else
 268                 ppc_md.enable_pmcs = power4_enable_pmcs;
 269 }
 270
 271 static int __init pSeries_init_panel(void)
 272 {
 273         /* Manually leave the kernel version on the panel. */
 274         ppc_md.progress("Linux ppc64\n", 0);
 275         ppc_md.progress(system_utsname.version, 0);
 276
 277         return 0;
 278 }
 279 arch_initcall(pSeries_init_panel);
 280
 281
 282 /* Build up the ppc64_firmware_features bitmask field
 283  * using contents of device-tree/ibm,hypertas-functions.
 284  * Ultimately this functionality may be moved into prom.c prom_init().
 285  */
 286 static void __init fw_feature_init(void)
 287 {
 288         struct device_node * dn;
 289         char * hypertas;
 290         unsigned int len;
 291
 292         DBG(" -> fw_feature_init()\n");
 293
 294         ppc64_firmware_features = 0;
 295         dn = of_find_node_by_path("/rtas");
 296         if (dn == NULL) {
 297                 printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n");
 298                 goto no_rtas;
 299         }
 300
 301         hypertas = get_property(dn, "ibm,hypertas-functions", &len);
 302         if (hypertas) {
 303                 while (len > 0){
 304                         int i, hypertas_len;
 305                         /* check value against table of strings */
 306                         for(i=0; i < FIRMWARE_MAX_FEATURES ;i++) {
 307                                 if ((firmware_features_table[i].name) &&
 308                                     (strcmp(firmware_features_table[i].name,hypertas))==0) {
 309                                         /* we have a match */
 310                                         ppc64_firmware_features |=
 311                                                 (firmware_features_table[i].val);
 312                                         break;
 313                                 }
 314                         }
 315                         hypertas_len = strlen(hypertas);
 316                         len -= hypertas_len +1;
 317                         hypertas+= hypertas_len +1;
 318                 }
 319         }
 320
 321         of_node_put(dn);
 322  no_rtas:
 323         printk(KERN_INFO "firmware_features = 0x%lx\n",
 324                ppc64_firmware_features);
 325
 326         DBG(" <- fw_feature_init()\n");
 327 }
 328
 329
 330 static  void __init pSeries_discover_pic(void)
 331 {
 332         struct device_node *np;
 333         char *typep;
 334
 335         /*
 336          * Setup interrupt mapping options that are needed for finish_device_tree
 337          * to properly parse the OF interrupt tree & do the virtual irq mapping
 338          */
 339         __irq_offset_value = NUM_ISA_INTERRUPTS;
 340         ppc64_interrupt_controller = IC_INVALID;
 341         for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
 342                 typep = (char *)get_property(np, "compatible", NULL);
 343                 if (strstr(typep, "open-pic"))
 344                         ppc64_interrupt_controller = IC_OPEN_PIC;
 345                 else if (strstr(typep, "ppc-xicp"))
 346                         ppc64_interrupt_controller = IC_PPC_XIC;
 347                 else
 348                         printk("pSeries_discover_pic: failed to recognize"
 349                                " interrupt-controller\n");
 350                 break;
 351         }
 352 }
 353
 354 static void pSeries_mach_cpu_die(void)
 355 {
 356         local_irq_disable();
 357         idle_task_exit();
 358         /* Some hardware requires clearing the CPPR, while other hardware does not
 359          * it is safe either way
 360          */
 361         pSeriesLP_cppr_info(0, 0);
 362         rtas_stop_self();
 363         /* Should never get here... */
 364         BUG();
 365         for(;;);
 366 }
 367
 368
 369 /*
 370  * Early initialization.  Relocation is on but do not reference unbolted pages
 371  */
 372 static void __init pSeries_init_early(void)
 373 {
 374         void *comport;
 375         int iommu_off = 0;
 376         unsigned int default_speed;
 377         u64 physport;
 378
 379         DBG(" -> pSeries_init_early()\n");
 380
 381         fw_feature_init();
 382
 383         if (systemcfg->platform & PLATFORM_LPAR)
 384                 hpte_init_lpar();
 385         else {
 386                 hpte_init_native();
 387                 iommu_off = (of_chosen &&
 388                              get_property(of_chosen, "linux,iommu-off", NULL));
 389         }
 390
 391         generic_find_legacy_serial_ports(&physport, &default_speed);
 392
 393         if (systemcfg->platform & PLATFORM_LPAR)
 394                 find_udbg_vterm();
 395         else if (physport) {
 396                 /* Map the uart for udbg. */
 397                 comport = (void *)ioremap(physport, 16);
 398                 udbg_init_uart(comport, default_speed);
 399
 400                 DBG("Hello World !\n");
 401         }
 402
 403
 404         iommu_init_early_pSeries();
 405
 406         pSeries_discover_pic();
 407
 408         DBG(" <- pSeries_init_early()\n");
 409 }
 410
 411
 412 static int pSeries_check_legacy_ioport(unsigned int baseport)
 413 {
 414         struct device_node *np;
 415
 416 #define I8042_DATA_REG  0x60
 417 #define FDC_BASE        0x3f0
 418
 419
 420         switch(baseport) {
 421         case I8042_DATA_REG:
 422                 np = of_find_node_by_type(NULL, "8042");
 423                 if (np == NULL)
 424                         return -ENODEV;
 425                 of_node_put(np);
 426                 break;
 427         case FDC_BASE:
 428                 np = of_find_node_by_type(NULL, "fdc");
 429                 if (np == NULL)
 430                         return -ENODEV;
 431                 of_node_put(np);
 432                 break;
 433         }
 434         return 0;
 435 }
 436
 437 /*
 438  * Called very early, MMU is off, device-tree isn't unflattened
 439  */
 440 extern struct machdep_calls pSeries_md;
 441
 442 static int __init pSeries_probe(int platform)
 443 {
 444         if (platform != PLATFORM_PSERIES &&
 445             platform != PLATFORM_PSERIES_LPAR)
 446                 return 0;
 447
 448         /* if we have some ppc_md fixups for LPAR to do, do
 449          * it here ...
 450          */
 451
 452         return 1;
 453 }
 454
 455 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 456
 457 static inline void dedicated_idle_sleep(unsigned int cpu)
 458 {
 459         struct paca_struct *ppaca = &paca[cpu ^ 1];
 460
 461         /* Only sleep if the other thread is not idle */
 462         if (!(ppaca->lppaca.idle)) {
 463                 local_irq_disable();
 464
 465                 /*
 466                  * We are about to sleep the thread and so wont be polling any
 467                  * more.
 468                  */
 469                 clear_thread_flag(TIF_POLLING_NRFLAG);
 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         } else {
 483                 /*
 484                  * Give the HV an opportunity at the processor, since we are
 485                  * not doing any work.
 486                  */
 487                 poll_pending();
 488         }
 489 }
 490
 491 static int pseries_dedicated_idle(void)
 492 {
 493         long oldval;
 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
 499         while (1) {
 500                 /*
 501                  * Indicate to the HV that we are idle. Now would be
 502                  * a good time to find other work to dispatch.
 503                  */
 504                 lpaca->lppaca.idle = 1;
 505
 506                 oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
 507                 if (!oldval) {
 508                         set_thread_flag(TIF_POLLING_NRFLAG);
 509
 510                         start_snooze = __get_tb() +
 511                                 *smt_snooze_delay * tb_ticks_per_usec;
 512
 513                         while (!need_resched() && !cpu_is_offline(cpu)) {
 514                                 ppc64_runlatch_off();
 515
 516                                 /*
 517                                  * Go into low thread priority and possibly
 518                                  * low power mode.
 519                                  */
 520                                 HMT_low();
 521                                 HMT_very_low();
 522
 523                                 if (*smt_snooze_delay != 0 &&
 524                                     __get_tb() > start_snooze) {
 525                                         HMT_medium();
 526                                         dedicated_idle_sleep(cpu);
 527                                 }
 528
 529                         }
 530
 531                         HMT_medium();
 532                         clear_thread_flag(TIF_POLLING_NRFLAG);
 533                 } else {
 534                         set_need_resched();
 535                 }
 536
 537                 lpaca->lppaca.idle = 0;
 538                 ppc64_runlatch_on();
 539
 540                 schedule();
 541
 542                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 543                         cpu_die();
 544         }
 545 }
 546
 547 static int 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                 schedule();
 585
 586                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
 587                         cpu_die();
 588         }
 589
 590         return 0;
 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         .get_cpuinfo            = pSeries_get_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 };