git.oblomov.eu Git - linux-2.6/blob - 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/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
  74 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  75
  76 static void pseries_shared_idle_sleep(void);
  77 static void pseries_dedicated_idle_sleep(void);
  78
  79 static struct device_node *pSeries_mpic_node;
  80
  81 static void pSeries_show_cpuinfo(struct seq_file *m)
  82 {
  83         struct device_node *root;
  84         const char *model = "";
  85
  86         root = of_find_node_by_path("/");
  87         if (root)
  88                 model = of_get_property(root, "model", NULL);
  89         seq_printf(m, "machine\t\t: CHRP %s\n", model);
  90         of_node_put(root);
  91 }
  92
  93 /* Initialize firmware assisted non-maskable interrupts if
  94  * the firmware supports this feature.
  95  */
  96 static void __init fwnmi_init(void)
  97 {
  98         unsigned long system_reset_addr, machine_check_addr;
  99
 100         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 101         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 102                 return;
 103
 104         /* If the kernel's not linked at zero we point the firmware at low
 105          * addresses anyway, and use a trampoline to get to the real code. */
 106         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
 107         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
 108
 109         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
 110                                 machine_check_addr))
 111                 fwnmi_active = 1;
 112 }
 113
 114 void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
 115 {
 116         unsigned int cascade_irq = i8259_irq();
 117         if (cascade_irq != NO_IRQ)
 118                 generic_handle_irq(cascade_irq);
 119         desc->chip->eoi(irq);
 120 }
 121
 122 static void __init pseries_setup_i8259_cascade(void)
 123 {
 124         struct device_node *np, *old, *found = NULL;
 125         unsigned int cascade;
 126         const u32 *addrp;
 127         unsigned long intack = 0;
 128         int naddr;
 129
 130         for_each_node_by_type(np, "interrupt-controller") {
 131                 if (of_device_is_compatible(np, "chrp,iic")) {
 132                         found = np;
 133                         break;
 134                 }
 135         }
 136
 137         if (found == NULL) {
 138                 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
 139                 return;
 140         }
 141
 142         cascade = irq_of_parse_and_map(found, 0);
 143         if (cascade == NO_IRQ) {
 144                 printk(KERN_ERR "pic: failed to map cascade interrupt");
 145                 return;
 146         }
 147         pr_debug("pic: cascade mapped to irq %d\n", cascade);
 148
 149         for (old = of_node_get(found); old != NULL ; old = np) {
 150                 np = of_get_parent(old);
 151                 of_node_put(old);
 152                 if (np == NULL)
 153                         break;
 154                 if (strcmp(np->name, "pci") != 0)
 155                         continue;
 156                 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
 157                 if (addrp == NULL)
 158                         continue;
 159                 naddr = of_n_addr_cells(np);
 160                 intack = addrp[naddr-1];
 161                 if (naddr > 1)
 162                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
 163         }
 164         if (intack)
 165                 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
 166         i8259_init(found, intack);
 167         of_node_put(found);
 168         set_irq_chained_handler(cascade, pseries_8259_cascade);
 169 }
 170
 171 static void __init pseries_mpic_init_IRQ(void)
 172 {
 173         struct device_node *np;
 174         const unsigned int *opprop;
 175         unsigned long openpic_addr = 0;
 176         int naddr, n, i, opplen;
 177         struct mpic *mpic;
 178
 179         np = of_find_node_by_path("/");
 180         naddr = of_n_addr_cells(np);
 181         opprop = of_get_property(np, "platform-open-pic", &opplen);
 182         if (opprop != 0) {
 183                 openpic_addr = of_read_number(opprop, naddr);
 184                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 185         }
 186         of_node_put(np);
 187
 188         BUG_ON(openpic_addr == 0);
 189
 190         /* Setup the openpic driver */
 191         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
 192                           MPIC_PRIMARY,
 193                           16, 250, /* isu size, irq count */
 194                           " MPIC     ");
 195         BUG_ON(mpic == NULL);
 196
 197         /* Add ISUs */
 198         opplen /= sizeof(u32);
 199         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 200                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
 201                 mpic_assign_isu(mpic, n, isuaddr);
 202         }
 203
 204         /* All ISUs are setup, complete initialization */
 205         mpic_init(mpic);
 206
 207         /* Look for cascade */
 208         pseries_setup_i8259_cascade();
 209 }
 210
 211 static void __init pseries_xics_init_IRQ(void)
 212 {
 213         xics_init_IRQ();
 214         pseries_setup_i8259_cascade();
 215 }
 216
 217 static void pseries_lpar_enable_pmcs(void)
 218 {
 219         unsigned long set, reset;
 220
 221         set = 1UL << 63;
 222         reset = 0;
 223         plpar_hcall_norets(H_PERFMON, set, reset);
 224
 225         /* instruct hypervisor to maintain PMCs */
 226         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 227                 get_lppaca()->pmcregs_in_use = 1;
 228 }
 229
 230 static void __init pseries_discover_pic(void)
 231 {
 232         struct device_node *np;
 233         const char *typep;
 234
 235         for (np = NULL; (np = of_find_node_by_name(np,
 236                                                    "interrupt-controller"));) {
 237                 typep = of_get_property(np, "compatible", NULL);
 238                 if (strstr(typep, "open-pic")) {
 239                         pSeries_mpic_node = of_node_get(np);
 240                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
 241                         ppc_md.get_irq        = mpic_get_irq;
 242                         setup_kexec_cpu_down_mpic();
 243                         smp_init_pseries_mpic();
 244                         return;
 245                 } else if (strstr(typep, "ppc-xicp")) {
 246                         ppc_md.init_IRQ       = pseries_xics_init_IRQ;
 247                         setup_kexec_cpu_down_xics();
 248                         smp_init_pseries_xics();
 249                         return;
 250                 }
 251         }
 252         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
 253                " interrupt-controller\n");
 254 }
 255
 256 static void __init pSeries_setup_arch(void)
 257 {
 258         /* Discover PIC type and setup ppc_md accordingly */
 259         pseries_discover_pic();
 260
 261         /* openpic global configuration register (64-bit format). */
 262         /* openpic Interrupt Source Unit pointer (64-bit format). */
 263         /* python0 facility area (mmio) (64-bit format) REAL address. */
 264
 265         /* init to some ~sane value until calibrate_delay() runs */
 266         loops_per_jiffy = 50000000;
 267
 268         fwnmi_init();
 269
 270         /* Find and initialize PCI host bridges */
 271         init_pci_config_tokens();
 272         find_and_init_phbs();
 273         eeh_init();
 274
 275         pSeries_nvram_init();
 276
 277         /* Choose an idle loop */
 278         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 279                 vpa_init(boot_cpuid);
 280                 if (get_lppaca()->shared_proc) {
 281                         printk(KERN_DEBUG "Using shared processor idle loop\n");
 282                         ppc_md.power_save = pseries_shared_idle_sleep;
 283                 } else {
 284                         printk(KERN_DEBUG "Using dedicated idle loop\n");
 285                         ppc_md.power_save = pseries_dedicated_idle_sleep;
 286                 }
 287         } else {
 288                 printk(KERN_DEBUG "Using default idle loop\n");
 289         }
 290
 291         if (firmware_has_feature(FW_FEATURE_LPAR))
 292                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 293         else
 294                 ppc_md.enable_pmcs = power4_enable_pmcs;
 295 }
 296
 297 static int __init pSeries_init_panel(void)
 298 {
 299         /* Manually leave the kernel version on the panel. */
 300         ppc_md.progress("Linux ppc64\n", 0);
 301         ppc_md.progress(init_utsname()->version, 0);
 302
 303         return 0;
 304 }
 305 arch_initcall(pSeries_init_panel);
 306
 307 static int pseries_set_dabr(unsigned long dabr)
 308 {
 309         return plpar_hcall_norets(H_SET_DABR, dabr);
 310 }
 311
 312 static int pseries_set_xdabr(unsigned long dabr)
 313 {
 314         /* We want to catch accesses from kernel and userspace */
 315         return plpar_hcall_norets(H_SET_XDABR, dabr,
 316                         H_DABRX_KERNEL | H_DABRX_USER);
 317 }
 318
 319 /*
 320  * Early initialization.  Relocation is on but do not reference unbolted pages
 321  */
 322 static void __init pSeries_init_early(void)
 323 {
 324         pr_debug(" -> pSeries_init_early()\n");
 325
 326         if (firmware_has_feature(FW_FEATURE_LPAR))
 327                 find_udbg_vterm();
 328
 329         if (firmware_has_feature(FW_FEATURE_DABR))
 330                 ppc_md.set_dabr = pseries_set_dabr;
 331         else if (firmware_has_feature(FW_FEATURE_XDABR))
 332                 ppc_md.set_dabr = pseries_set_xdabr;
 333
 334         iommu_init_early_pSeries();
 335
 336         pr_debug(" <- pSeries_init_early()\n");
 337 }
 338
 339 /*
 340  * Called very early, MMU is off, device-tree isn't unflattened
 341  */
 342
 343 static int __init pSeries_probe_hypertas(unsigned long node,
 344                                          const char *uname, int depth,
 345                                          void *data)
 346 {
 347         const char *hypertas;
 348         unsigned long len;
 349
 350         if (depth != 1 ||
 351             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
 352                 return 0;
 353
 354         hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
 355         if (!hypertas)
 356                 return 1;
 357
 358         powerpc_firmware_features |= FW_FEATURE_LPAR;
 359         fw_feature_init(hypertas, len);
 360
 361         return 1;
 362 }
 363
 364 static int __init pSeries_probe(void)
 365 {
 366         unsigned long root = of_get_flat_dt_root();
 367         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
 368
 369         if (dtype == NULL)
 370                 return 0;
 371         if (strcmp(dtype, "chrp"))
 372                 return 0;
 373
 374         /* Cell blades firmware claims to be chrp while it's not. Until this
 375          * is fixed, we need to avoid those here.
 376          */
 377         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 378             of_flat_dt_is_compatible(root, "IBM,CBEA"))
 379                 return 0;
 380
 381         pr_debug("pSeries detected, looking for LPAR capability...\n");
 382
 383         /* Now try to figure out if we are running on LPAR */
 384         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
 385
 386         if (firmware_has_feature(FW_FEATURE_LPAR))
 387                 hpte_init_lpar();
 388         else
 389                 hpte_init_native();
 390
 391         pr_debug("Machine is%s LPAR !\n",
 392                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
 393
 394         return 1;
 395 }
 396
 397
 398 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 399
 400 static void pseries_dedicated_idle_sleep(void)
 401 {
 402         unsigned int cpu = smp_processor_id();
 403         unsigned long start_snooze;
 404         unsigned long in_purr, out_purr;
 405
 406         /*
 407          * Indicate to the HV that we are idle. Now would be
 408          * a good time to find other work to dispatch.
 409          */
 410         get_lppaca()->idle = 1;
 411         get_lppaca()->donate_dedicated_cpu = 1;
 412         in_purr = mfspr(SPRN_PURR);
 413
 414         /*
 415          * We come in with interrupts disabled, and need_resched()
 416          * has been checked recently.  If we should poll for a little
 417          * while, do so.
 418          */
 419         if (__get_cpu_var(smt_snooze_delay)) {
 420                 start_snooze = get_tb() +
 421                         __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
 422                 local_irq_enable();
 423                 set_thread_flag(TIF_POLLING_NRFLAG);
 424
 425                 while (get_tb() < start_snooze) {
 426                         if (need_resched() || cpu_is_offline(cpu))
 427                                 goto out;
 428                         ppc64_runlatch_off();
 429                         HMT_low();
 430                         HMT_very_low();
 431                 }
 432
 433                 HMT_medium();
 434                 clear_thread_flag(TIF_POLLING_NRFLAG);
 435                 smp_mb();
 436                 local_irq_disable();
 437                 if (need_resched() || cpu_is_offline(cpu))
 438                         goto out;
 439         }
 440
 441         cede_processor();
 442
 443 out:
 444         HMT_medium();
 445         out_purr = mfspr(SPRN_PURR);
 446         get_lppaca()->wait_state_cycles += out_purr - in_purr;
 447         get_lppaca()->donate_dedicated_cpu = 0;
 448         get_lppaca()->idle = 0;
 449 }
 450
 451 static void pseries_shared_idle_sleep(void)
 452 {
 453         /*
 454          * Indicate to the HV that we are idle. Now would be
 455          * a good time to find other work to dispatch.
 456          */
 457         get_lppaca()->idle = 1;
 458
 459         /*
 460          * Yield the processor to the hypervisor.  We return if
 461          * an external interrupt occurs (which are driven prior
 462          * to returning here) or if a prod occurs from another
 463          * processor. When returning here, external interrupts
 464          * are enabled.
 465          */
 466         cede_processor();
 467
 468         get_lppaca()->idle = 0;
 469 }
 470
 471 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 472 {
 473         if (firmware_has_feature(FW_FEATURE_LPAR))
 474                 return PCI_PROBE_DEVTREE;
 475         return PCI_PROBE_NORMAL;
 476 }
 477
 478 /**
 479  * pSeries_power_off - tell firmware about how to power off the system.
 480  *
 481  * This function calls either the power-off rtas token in normal cases
 482  * or the ibm,power-off-ups token (if present & requested) in case of
 483  * a power failure. If power-off token is used, power on will only be
 484  * possible with power button press. If ibm,power-off-ups token is used
 485  * it will allow auto poweron after power is restored.
 486  */
 487 void pSeries_power_off(void)
 488 {
 489         int rc;
 490         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
 491
 492         if (rtas_flash_term_hook)
 493                 rtas_flash_term_hook(SYS_POWER_OFF);
 494
 495         if (rtas_poweron_auto == 0 ||
 496                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
 497                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
 498                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
 499         } else {
 500                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
 501                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
 502         }
 503         for (;;);
 504 }
 505
 506 #ifndef CONFIG_PCI
 507 void pSeries_final_fixup(void) { }
 508 #endif
 509
 510 define_machine(pseries) {
 511         .name                   = "pSeries",
 512         .probe                  = pSeries_probe,
 513         .setup_arch             = pSeries_setup_arch,
 514         .init_early             = pSeries_init_early,
 515         .show_cpuinfo           = pSeries_show_cpuinfo,
 516         .log_error              = pSeries_log_error,
 517         .pcibios_fixup          = pSeries_final_fixup,
 518         .pci_probe_mode         = pSeries_pci_probe_mode,
 519         .restart                = rtas_restart,
 520         .power_off              = pSeries_power_off,
 521         .halt                   = rtas_halt,
 522         .panic                  = rtas_os_term,
 523         .get_boot_time          = rtas_get_boot_time,
 524         .get_rtc_time           = rtas_get_rtc_time,
 525         .set_rtc_time           = rtas_set_rtc_time,
 526         .calibrate_decr         = generic_calibrate_decr,
 527         .progress               = rtas_progress,
 528         .system_reset_exception = pSeries_system_reset_exception,
 529         .machine_check_exception = pSeries_machine_check_exception,
 530 };