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