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 #include <linux/cpu.h>
  20 #include <linux/errno.h>
  21 #include <linux/sched.h>
  22 #include <linux/kernel.h>
  23 #include <linux/mm.h>
  24 #include <linux/stddef.h>
  25 #include <linux/unistd.h>
  26 #include <linux/slab.h>
  27 #include <linux/user.h>
  28 #include <linux/a.out.h>
  29 #include <linux/tty.h>
  30 #include <linux/major.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/reboot.h>
  33 #include <linux/init.h>
  34 #include <linux/ioport.h>
  35 #include <linux/console.h>
  36 #include <linux/pci.h>
  37 #include <linux/utsname.h>
  38 #include <linux/adb.h>
  39 #include <linux/module.h>
  40 #include <linux/delay.h>
  41 #include <linux/irq.h>
  42 #include <linux/seq_file.h>
  43 #include <linux/root_dev.h>
  44
  45 #include <asm/mmu.h>
  46 #include <asm/processor.h>
  47 #include <asm/io.h>
  48 #include <asm/pgtable.h>
  49 #include <asm/prom.h>
  50 #include <asm/rtas.h>
  51 #include <asm/pci-bridge.h>
  52 #include <asm/iommu.h>
  53 #include <asm/dma.h>
  54 #include <asm/machdep.h>
  55 #include <asm/irq.h>
  56 #include <asm/time.h>
  57 #include <asm/nvram.h>
  58 #include "xics.h"
  59 #include <asm/pmc.h>
  60 #include <asm/mpic.h>
  61 #include <asm/ppc-pci.h>
  62 #include <asm/i8259.h>
  63 #include <asm/udbg.h>
  64 #include <asm/smp.h>
  65 #include <asm/firmware.h>
  66 #include <asm/eeh.h>
  67
  68 #include "plpar_wrappers.h"
  69 #include "pseries.h"
  70
  71
  72 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  73
  74 static void pseries_shared_idle_sleep(void);
  75 static void pseries_dedicated_idle_sleep(void);
  76
  77 static struct device_node *pSeries_mpic_node;
  78
  79 static void pSeries_show_cpuinfo(struct seq_file *m)
  80 {
  81         struct device_node *root;
  82         const char *model = "";
  83
  84         root = of_find_node_by_path("/");
  85         if (root)
  86                 model = of_get_property(root, "model", NULL);
  87         seq_printf(m, "machine\t\t: CHRP %s\n", model);
  88         of_node_put(root);
  89 }
  90
  91 /* Initialize firmware assisted non-maskable interrupts if
  92  * the firmware supports this feature.
  93  */
  94 static void __init fwnmi_init(void)
  95 {
  96         unsigned long system_reset_addr, machine_check_addr;
  97
  98         int ibm_nmi_register = rtas_token("ibm,nmi-register");
  99         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 100                 return;
 101
 102         /* If the kernel's not linked at zero we point the firmware at low
 103          * addresses anyway, and use a trampoline to get to the real code. */
 104         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
 105         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
 106
 107         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
 108                                 machine_check_addr))
 109                 fwnmi_active = 1;
 110 }
 111
 112 static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
 113 {
 114         unsigned int cascade_irq = i8259_irq();
 115         if (cascade_irq != NO_IRQ)
 116                 generic_handle_irq(cascade_irq);
 117         desc->chip->eoi(irq);
 118 }
 119
 120 static void __init pseries_setup_i8259_cascade(void)
 121 {
 122         struct device_node *np, *old, *found = NULL;
 123         unsigned int cascade;
 124         const u32 *addrp;
 125         unsigned long intack = 0;
 126         int naddr;
 127
 128         for_each_node_by_type(np, "interrupt-controller") {
 129                 if (of_device_is_compatible(np, "chrp,iic")) {
 130                         found = np;
 131                         break;
 132                 }
 133         }
 134
 135         if (found == NULL) {
 136                 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
 137                 return;
 138         }
 139
 140         cascade = irq_of_parse_and_map(found, 0);
 141         if (cascade == NO_IRQ) {
 142                 printk(KERN_ERR "pic: failed to map cascade interrupt");
 143                 return;
 144         }
 145         pr_debug("pic: cascade mapped to irq %d\n", cascade);
 146
 147         for (old = of_node_get(found); old != NULL ; old = np) {
 148                 np = of_get_parent(old);
 149                 of_node_put(old);
 150                 if (np == NULL)
 151                         break;
 152                 if (strcmp(np->name, "pci") != 0)
 153                         continue;
 154                 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
 155                 if (addrp == NULL)
 156                         continue;
 157                 naddr = of_n_addr_cells(np);
 158                 intack = addrp[naddr-1];
 159                 if (naddr > 1)
 160                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
 161         }
 162         if (intack)
 163                 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
 164         i8259_init(found, intack);
 165         of_node_put(found);
 166         set_irq_chained_handler(cascade, pseries_8259_cascade);
 167 }
 168
 169 static void __init pseries_mpic_init_IRQ(void)
 170 {
 171         struct device_node *np;
 172         const unsigned int *opprop;
 173         unsigned long openpic_addr = 0;
 174         int naddr, n, i, opplen;
 175         struct mpic *mpic;
 176
 177         np = of_find_node_by_path("/");
 178         naddr = of_n_addr_cells(np);
 179         opprop = of_get_property(np, "platform-open-pic", &opplen);
 180         if (opprop != 0) {
 181                 openpic_addr = of_read_number(opprop, naddr);
 182                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 183         }
 184         of_node_put(np);
 185
 186         BUG_ON(openpic_addr == 0);
 187
 188         /* Setup the openpic driver */
 189         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
 190                           MPIC_PRIMARY,
 191                           16, 250, /* isu size, irq count */
 192                           " MPIC     ");
 193         BUG_ON(mpic == NULL);
 194
 195         /* Add ISUs */
 196         opplen /= sizeof(u32);
 197         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 198                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
 199                 mpic_assign_isu(mpic, n, isuaddr);
 200         }
 201
 202         /* All ISUs are setup, complete initialization */
 203         mpic_init(mpic);
 204
 205         /* Look for cascade */
 206         pseries_setup_i8259_cascade();
 207 }
 208
 209 static void __init pseries_xics_init_IRQ(void)
 210 {
 211         xics_init_IRQ();
 212         pseries_setup_i8259_cascade();
 213 }
 214
 215 static void pseries_lpar_enable_pmcs(void)
 216 {
 217         unsigned long set, reset;
 218
 219         set = 1UL << 63;
 220         reset = 0;
 221         plpar_hcall_norets(H_PERFMON, set, reset);
 222
 223         /* instruct hypervisor to maintain PMCs */
 224         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 225                 get_lppaca()->pmcregs_in_use = 1;
 226 }
 227
 228 static void __init pseries_discover_pic(void)
 229 {
 230         struct device_node *np;
 231         const char *typep;
 232
 233         for (np = NULL; (np = of_find_node_by_name(np,
 234                                                    "interrupt-controller"));) {
 235                 typep = of_get_property(np, "compatible", NULL);
 236                 if (strstr(typep, "open-pic")) {
 237                         pSeries_mpic_node = of_node_get(np);
 238                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
 239                         ppc_md.get_irq        = mpic_get_irq;
 240                         setup_kexec_cpu_down_mpic();
 241                         smp_init_pseries_mpic();
 242                         return;
 243                 } else if (strstr(typep, "ppc-xicp")) {
 244                         ppc_md.init_IRQ       = pseries_xics_init_IRQ;
 245                         setup_kexec_cpu_down_xics();
 246                         smp_init_pseries_xics();
 247                         return;
 248                 }
 249         }
 250         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
 251                " interrupt-controller\n");
 252 }
 253
 254 static void __init pSeries_setup_arch(void)
 255 {
 256         /* Discover PIC type and setup ppc_md accordingly */
 257         pseries_discover_pic();
 258
 259         /* openpic global configuration register (64-bit format). */
 260         /* openpic Interrupt Source Unit pointer (64-bit format). */
 261         /* python0 facility area (mmio) (64-bit format) REAL address. */
 262
 263         /* init to some ~sane value until calibrate_delay() runs */
 264         loops_per_jiffy = 50000000;
 265
 266         fwnmi_init();
 267
 268         /* Find and initialize PCI host bridges */
 269         init_pci_config_tokens();
 270         find_and_init_phbs();
 271         eeh_init();
 272
 273         pSeries_nvram_init();
 274
 275         /* Choose an idle loop */
 276         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 277                 vpa_init(boot_cpuid);
 278                 if (get_lppaca()->shared_proc) {
 279                         printk(KERN_DEBUG "Using shared processor idle loop\n");
 280                         ppc_md.power_save = pseries_shared_idle_sleep;
 281                 } else {
 282                         printk(KERN_DEBUG "Using dedicated idle loop\n");
 283                         ppc_md.power_save = pseries_dedicated_idle_sleep;
 284                 }
 285         } else {
 286                 printk(KERN_DEBUG "Using default idle loop\n");
 287         }
 288
 289         if (firmware_has_feature(FW_FEATURE_LPAR))
 290                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 291         else
 292                 ppc_md.enable_pmcs = power4_enable_pmcs;
 293 }
 294
 295 static int __init pSeries_init_panel(void)
 296 {
 297         /* Manually leave the kernel version on the panel. */
 298         ppc_md.progress("Linux ppc64\n", 0);
 299         ppc_md.progress(init_utsname()->version, 0);
 300
 301         return 0;
 302 }
 303 arch_initcall(pSeries_init_panel);
 304
 305 static int pseries_set_dabr(unsigned long dabr)
 306 {
 307         return plpar_hcall_norets(H_SET_DABR, dabr);
 308 }
 309
 310 static int pseries_set_xdabr(unsigned long dabr)
 311 {
 312         /* We want to catch accesses from kernel and userspace */
 313         return plpar_hcall_norets(H_SET_XDABR, dabr,
 314                         H_DABRX_KERNEL | H_DABRX_USER);
 315 }
 316
 317 /*
 318  * Early initialization.  Relocation is on but do not reference unbolted pages
 319  */
 320 static void __init pSeries_init_early(void)
 321 {
 322         pr_debug(" -> pSeries_init_early()\n");
 323
 324         if (firmware_has_feature(FW_FEATURE_LPAR))
 325                 find_udbg_vterm();
 326
 327         if (firmware_has_feature(FW_FEATURE_DABR))
 328                 ppc_md.set_dabr = pseries_set_dabr;
 329         else if (firmware_has_feature(FW_FEATURE_XDABR))
 330                 ppc_md.set_dabr = pseries_set_xdabr;
 331
 332         iommu_init_early_pSeries();
 333
 334         pr_debug(" <- pSeries_init_early()\n");
 335 }
 336
 337 /*
 338  * Called very early, MMU is off, device-tree isn't unflattened
 339  */
 340
 341 static int __init pSeries_probe_hypertas(unsigned long node,
 342                                          const char *uname, int depth,
 343                                          void *data)
 344 {
 345         const char *hypertas;
 346         unsigned long len;
 347
 348         if (depth != 1 ||
 349             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
 350                 return 0;
 351
 352         hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
 353         if (!hypertas)
 354                 return 1;
 355
 356         powerpc_firmware_features |= FW_FEATURE_LPAR;
 357         fw_feature_init(hypertas, len);
 358
 359         return 1;
 360 }
 361
 362 static int __init pSeries_probe(void)
 363 {
 364         unsigned long root = of_get_flat_dt_root();
 365         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
 366
 367         if (dtype == NULL)
 368                 return 0;
 369         if (strcmp(dtype, "chrp"))
 370                 return 0;
 371
 372         /* Cell blades firmware claims to be chrp while it's not. Until this
 373          * is fixed, we need to avoid those here.
 374          */
 375         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 376             of_flat_dt_is_compatible(root, "IBM,CBEA"))
 377                 return 0;
 378
 379         pr_debug("pSeries detected, looking for LPAR capability...\n");
 380
 381         /* Now try to figure out if we are running on LPAR */
 382         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
 383
 384         if (firmware_has_feature(FW_FEATURE_LPAR))
 385                 hpte_init_lpar();
 386         else
 387                 hpte_init_native();
 388
 389         pr_debug("Machine is%s LPAR !\n",
 390                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
 391
 392         return 1;
 393 }
 394
 395
 396 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 397
 398 static void pseries_dedicated_idle_sleep(void)
 399 {
 400         unsigned int cpu = smp_processor_id();
 401         unsigned long start_snooze;
 402         unsigned long in_purr, out_purr;
 403
 404         /*
 405          * Indicate to the HV that we are idle. Now would be
 406          * a good time to find other work to dispatch.
 407          */
 408         get_lppaca()->idle = 1;
 409         get_lppaca()->donate_dedicated_cpu = 1;
 410         in_purr = mfspr(SPRN_PURR);
 411
 412         /*
 413          * We come in with interrupts disabled, and need_resched()
 414          * has been checked recently.  If we should poll for a little
 415          * while, do so.
 416          */
 417         if (__get_cpu_var(smt_snooze_delay)) {
 418                 start_snooze = get_tb() +
 419                         __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
 420                 local_irq_enable();
 421                 set_thread_flag(TIF_POLLING_NRFLAG);
 422
 423                 while (get_tb() < start_snooze) {
 424                         if (need_resched() || cpu_is_offline(cpu))
 425                                 goto out;
 426                         ppc64_runlatch_off();
 427                         HMT_low();
 428                         HMT_very_low();
 429                 }
 430
 431                 HMT_medium();
 432                 clear_thread_flag(TIF_POLLING_NRFLAG);
 433                 smp_mb();
 434                 local_irq_disable();
 435                 if (need_resched() || cpu_is_offline(cpu))
 436                         goto out;
 437         }
 438
 439         cede_processor();
 440
 441 out:
 442         HMT_medium();
 443         out_purr = mfspr(SPRN_PURR);
 444         get_lppaca()->wait_state_cycles += out_purr - in_purr;
 445         get_lppaca()->donate_dedicated_cpu = 0;
 446         get_lppaca()->idle = 0;
 447 }
 448
 449 static void pseries_shared_idle_sleep(void)
 450 {
 451         /*
 452          * Indicate to the HV that we are idle. Now would be
 453          * a good time to find other work to dispatch.
 454          */
 455         get_lppaca()->idle = 1;
 456
 457         /*
 458          * Yield the processor to the hypervisor.  We return if
 459          * an external interrupt occurs (which are driven prior
 460          * to returning here) or if a prod occurs from another
 461          * processor. When returning here, external interrupts
 462          * are enabled.
 463          */
 464         cede_processor();
 465
 466         get_lppaca()->idle = 0;
 467 }
 468
 469 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 470 {
 471         if (firmware_has_feature(FW_FEATURE_LPAR))
 472                 return PCI_PROBE_DEVTREE;
 473         return PCI_PROBE_NORMAL;
 474 }
 475
 476 /**
 477  * pSeries_power_off - tell firmware about how to power off the system.
 478  *
 479  * This function calls either the power-off rtas token in normal cases
 480  * or the ibm,power-off-ups token (if present & requested) in case of
 481  * a power failure. If power-off token is used, power on will only be
 482  * possible with power button press. If ibm,power-off-ups token is used
 483  * it will allow auto poweron after power is restored.
 484  */
 485 static void pSeries_power_off(void)
 486 {
 487         int rc;
 488         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
 489
 490         if (rtas_flash_term_hook)
 491                 rtas_flash_term_hook(SYS_POWER_OFF);
 492
 493         if (rtas_poweron_auto == 0 ||
 494                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
 495                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
 496                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
 497         } else {
 498                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
 499                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
 500         }
 501         for (;;);
 502 }
 503
 504 #ifndef CONFIG_PCI
 505 void pSeries_final_fixup(void) { }
 506 #endif
 507
 508 define_machine(pseries) {
 509         .name                   = "pSeries",
 510         .probe                  = pSeries_probe,
 511         .setup_arch             = pSeries_setup_arch,
 512         .init_early             = pSeries_init_early,
 513         .show_cpuinfo           = pSeries_show_cpuinfo,
 514         .log_error              = pSeries_log_error,
 515         .pcibios_fixup          = pSeries_final_fixup,
 516         .pci_probe_mode         = pSeries_pci_probe_mode,
 517         .restart                = rtas_restart,
 518         .power_off              = pSeries_power_off,
 519         .halt                   = rtas_halt,
 520         .panic                  = rtas_os_term,
 521         .get_boot_time          = rtas_get_boot_time,
 522         .get_rtc_time           = rtas_get_rtc_time,
 523         .set_rtc_time           = rtas_set_rtc_time,
 524         .calibrate_decr         = generic_calibrate_decr,
 525         .progress               = rtas_progress,
 526         .system_reset_exception = pSeries_system_reset_exception,
 527         .machine_check_exception = pSeries_machine_check_exception,
 528 };