release/src-rt-6.x/linux/linux-2.6/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 /* move those away to a .h */
  80 extern void find_udbg_vterm(void);
  81
  82 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  83
  84 static void pseries_shared_idle_sleep(void);
  85 static void pseries_dedicated_idle_sleep(void);
  86
  87 static struct device_node *pSeries_mpic_node;
  88
  89 static void pSeries_show_cpuinfo(struct seq_file *m)
  90 {
  91         struct device_node *root;
  92         const char *model = "";
  93
  94         root = of_find_node_by_path("/");
  95         if (root)
  96                 model = of_get_property(root, "model", NULL);
  97         seq_printf(m, "machine\t\t: CHRP %s\n", model);
  98         of_node_put(root);
  99 }
 100
 101 /* Initialize firmware assisted non-maskable interrupts if
 102  * the firmware supports this feature.
 103  */
 104 static void __init fwnmi_init(void)
 105 {
 106         unsigned long system_reset_addr, machine_check_addr;
 107
 108         int ibm_nmi_register = rtas_token("ibm,nmi-register");
 109         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 110                 return;
 111
 112         /* If the kernel's not linked at zero we point the firmware at low
 113          * addresses anyway, and use a trampoline to get to the real code. */
 114         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
 115         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
 116
 117         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
 118                                 machine_check_addr))
 119                 fwnmi_active = 1;
 120 }
 121
 122 void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
 123 {
 124         unsigned int cascade_irq = i8259_irq();
 125         if (cascade_irq != NO_IRQ)
 126                 generic_handle_irq(cascade_irq);
 127         desc->chip->eoi(irq);
 128 }
 129
 130 static void __init pseries_mpic_init_IRQ(void)
 131 {
 132         struct device_node *np, *old, *cascade = NULL;
 133         const unsigned int *addrp;
 134         unsigned long intack = 0;
 135         const unsigned int *opprop;
 136         unsigned long openpic_addr = 0;
 137         unsigned int cascade_irq;
 138         int naddr, n, i, opplen;
 139         struct mpic *mpic;
 140
 141         np = of_find_node_by_path("/");
 142         naddr = of_n_addr_cells(np);
 143         opprop = of_get_property(np, "platform-open-pic", &opplen);
 144         if (opprop != 0) {
 145                 openpic_addr = of_read_number(opprop, naddr);
 146                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 147         }
 148         of_node_put(np);
 149
 150         BUG_ON(openpic_addr == 0);
 151
 152         /* Setup the openpic driver */
 153         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
 154                           MPIC_PRIMARY,
 155                           16, 250, /* isu size, irq count */
 156                           " MPIC     ");
 157         BUG_ON(mpic == NULL);
 158
 159         /* Add ISUs */
 160         opplen /= sizeof(u32);
 161         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 162                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
 163                 mpic_assign_isu(mpic, n, isuaddr);
 164         }
 165
 166         /* All ISUs are setup, complete initialization */
 167         mpic_init(mpic);
 168
 169         /* Look for cascade */
 170         for_each_node_by_type(np, "interrupt-controller")
 171                 if (of_device_is_compatible(np, "chrp,iic")) {
 172                         cascade = np;
 173                         break;
 174                 }
 175         if (cascade == NULL)
 176                 return;
 177
 178         cascade_irq = irq_of_parse_and_map(cascade, 0);
 179         if (cascade == NO_IRQ) {
 180                 printk(KERN_ERR "mpic: failed to map cascade interrupt");
 181                 return;
 182         }
 183
 184         /* Check ACK type */
 185         for (old = of_node_get(cascade); old != NULL ; old = np) {
 186                 np = of_get_parent(old);
 187                 of_node_put(old);
 188                 if (np == NULL)
 189                         break;
 190                 if (strcmp(np->name, "pci") != 0)
 191                         continue;
 192                 addrp = of_get_property(np, "8259-interrupt-acknowledge",
 193                                             NULL);
 194                 if (addrp == NULL)
 195                         continue;
 196                 naddr = of_n_addr_cells(np);
 197                 intack = addrp[naddr-1];
 198                 if (naddr > 1)
 199                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
 200         }
 201         if (intack)
 202                 printk(KERN_DEBUG "mpic: PCI 8259 intack at 0x%016lx\n",
 203                        intack);
 204         i8259_init(cascade, intack);
 205         of_node_put(cascade);
 206         set_irq_chained_handler(cascade_irq, pseries_8259_cascade);
 207 }
 208
 209 static void pseries_lpar_enable_pmcs(void)
 210 {
 211         unsigned long set, reset;
 212
 213         set = 1UL << 63;
 214         reset = 0;
 215         plpar_hcall_norets(H_PERFMON, set, reset);
 216
 217         /* instruct hypervisor to maintain PMCs */
 218         if (firmware_has_feature(FW_FEATURE_SPLPAR))
 219                 get_lppaca()->pmcregs_in_use = 1;
 220 }
 221
 222 static void __init pseries_discover_pic(void)
 223 {
 224         struct device_node *np;
 225         const char *typep;
 226
 227         for (np = NULL; (np = of_find_node_by_name(np,
 228                                                    "interrupt-controller"));) {
 229                 typep = of_get_property(np, "compatible", NULL);
 230                 if (strstr(typep, "open-pic")) {
 231                         pSeries_mpic_node = of_node_get(np);
 232                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
 233                         ppc_md.get_irq        = mpic_get_irq;
 234                         setup_kexec_cpu_down_mpic();
 235                         smp_init_pseries_mpic();
 236                         return;
 237                 } else if (strstr(typep, "ppc-xicp")) {
 238                         ppc_md.init_IRQ       = xics_init_IRQ;
 239                         setup_kexec_cpu_down_xics();
 240                         smp_init_pseries_xics();
 241                         return;
 242                 }
 243         }
 244         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
 245                " interrupt-controller\n");
 246 }
 247
 248 static void __init pSeries_setup_arch(void)
 249 {
 250         /* Discover PIC type and setup ppc_md accordingly */
 251         pseries_discover_pic();
 252
 253         /* openpic global configuration register (64-bit format). */
 254         /* openpic Interrupt Source Unit pointer (64-bit format). */
 255         /* python0 facility area (mmio) (64-bit format) REAL address. */
 256
 257         /* init to some ~sane value until calibrate_delay() runs */
 258         loops_per_jiffy = 50000000;
 259
 260         if (ROOT_DEV == 0) {
 261                 printk("No ramdisk, default root is /dev/sda2\n");
 262                 ROOT_DEV = Root_SDA2;
 263         }
 264
 265         fwnmi_init();
 266
 267         /* Find and initialize PCI host bridges */
 268         init_pci_config_tokens();
 269         find_and_init_phbs();
 270         eeh_init();
 271
 272         pSeries_nvram_init();
 273
 274         /* Choose an idle loop */
 275         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 276                 vpa_init(boot_cpuid);
 277                 if (get_lppaca()->shared_proc) {
 278                         printk(KERN_DEBUG "Using shared processor idle loop\n");
 279                         ppc_md.power_save = pseries_shared_idle_sleep;
 280                 } else {
 281                         printk(KERN_DEBUG "Using dedicated idle loop\n");
 282                         ppc_md.power_save = pseries_dedicated_idle_sleep;
 283                 }
 284         } else {
 285                 printk(KERN_DEBUG "Using default idle loop\n");
 286         }
 287
 288         if (firmware_has_feature(FW_FEATURE_LPAR))
 289                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 290         else
 291                 ppc_md.enable_pmcs = power4_enable_pmcs;
 292 }
 293
 294 static int __init pSeries_init_panel(void)
 295 {
 296         /* Manually leave the kernel version on the panel. */
 297         ppc_md.progress("Linux ppc64\n", 0);
 298         ppc_md.progress(init_utsname()->version, 0);
 299
 300         return 0;
 301 }
 302 arch_initcall(pSeries_init_panel);
 303
 304 static int pseries_set_dabr(unsigned long dabr)
 305 {
 306         return plpar_hcall_norets(H_SET_DABR, dabr);
 307 }
 308
 309 static int pseries_set_xdabr(unsigned long dabr)
 310 {
 311         /* We want to catch accesses from kernel and userspace */
 312         return plpar_hcall_norets(H_SET_XDABR, dabr,
 313                         H_DABRX_KERNEL | H_DABRX_USER);
 314 }
 315
 316 /*
 317  * Early initialization.  Relocation is on but do not reference unbolted pages
 318  */
 319 static void __init pSeries_init_early(void)
 320 {
 321         DBG(" -> pSeries_init_early()\n");
 322
 323         fw_feature_init();
 324
 325         if (firmware_has_feature(FW_FEATURE_LPAR))
 326                 find_udbg_vterm();
 327
 328         if (firmware_has_feature(FW_FEATURE_DABR))
 329                 ppc_md.set_dabr = pseries_set_dabr;
 330         else if (firmware_has_feature(FW_FEATURE_XDABR))
 331                 ppc_md.set_dabr = pseries_set_xdabr;
 332
 333         iommu_init_early_pSeries();
 334
 335         DBG(" <- pSeries_init_early()\n");
 336 }
 337
 338 /*
 339  * Called very early, MMU is off, device-tree isn't unflattened
 340  */
 341
 342 static int __init pSeries_probe_hypertas(unsigned long node,
 343                                          const char *uname, int depth,
 344                                          void *data)
 345 {
 346         if (depth != 1 ||
 347             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
 348                 return 0;
 349
 350         if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL) != NULL)
 351                 powerpc_firmware_features |= FW_FEATURE_LPAR;
 352
 353         return 1;
 354 }
 355
 356 static int __init pSeries_probe(void)
 357 {
 358         unsigned long root = of_get_flat_dt_root();
 359         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
 360
 361         if (dtype == NULL)
 362                 return 0;
 363         if (strcmp(dtype, "chrp"))
 364                 return 0;
 365
 366         /* Cell blades firmware claims to be chrp while it's not. Until this
 367          * is fixed, we need to avoid those here.
 368          */
 369         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 370             of_flat_dt_is_compatible(root, "IBM,CBEA"))
 371                 return 0;
 372
 373         DBG("pSeries detected, looking for LPAR capability...\n");
 374
 375         /* Now try to figure out if we are running on LPAR */
 376         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
 377
 378         if (firmware_has_feature(FW_FEATURE_LPAR))
 379                 hpte_init_lpar();
 380         else
 381                 hpte_init_native();
 382
 383         DBG("Machine is%s LPAR !\n",
 384             (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
 385
 386         return 1;
 387 }
 388
 389
 390 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
 391
 392 static void pseries_dedicated_idle_sleep(void)
 393 {
 394         unsigned int cpu = smp_processor_id();
 395         unsigned long start_snooze;
 396
 397         /*
 398          * Indicate to the HV that we are idle. Now would be
 399          * a good time to find other work to dispatch.
 400          */
 401         get_lppaca()->idle = 1;
 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         get_lppaca()->idle = 0;
 435 }
 436
 437 static void pseries_shared_idle_sleep(void)
 438 {
 439         /*
 440          * Indicate to the HV that we are idle. Now would be
 441          * a good time to find other work to dispatch.
 442          */
 443         get_lppaca()->idle = 1;
 444
 445         /*
 446          * Yield the processor to the hypervisor.  We return if
 447          * an external interrupt occurs (which are driven prior
 448          * to returning here) or if a prod occurs from another
 449          * processor. When returning here, external interrupts
 450          * are enabled.
 451          */
 452         cede_processor();
 453
 454         get_lppaca()->idle = 0;
 455 }
 456
 457 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 458 {
 459         if (firmware_has_feature(FW_FEATURE_LPAR))
 460                 return PCI_PROBE_DEVTREE;
 461         return PCI_PROBE_NORMAL;
 462 }
 463
 464 /**
 465  * pSeries_power_off - tell firmware about how to power off the system.
 466  *
 467  * This function calls either the power-off rtas token in normal cases
 468  * or the ibm,power-off-ups token (if present & requested) in case of
 469  * a power failure. If power-off token is used, power on will only be
 470  * possible with power button press. If ibm,power-off-ups token is used
 471  * it will allow auto poweron after power is restored.
 472  */
 473 void pSeries_power_off(void)
 474 {
 475         int rc;
 476         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
 477
 478         if (rtas_flash_term_hook)
 479                 rtas_flash_term_hook(SYS_POWER_OFF);
 480
 481         if (rtas_poweron_auto == 0 ||
 482                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
 483                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
 484                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
 485         } else {
 486                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
 487                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
 488         }
 489         for (;;);
 490 }
 491
 492 #ifndef CONFIG_PCI
 493 void pSeries_final_fixup(void) { }
 494 #endif
 495
 496 define_machine(pseries) {
 497         .name                   = "pSeries",
 498         .probe                  = pSeries_probe,
 499         .setup_arch             = pSeries_setup_arch,
 500         .init_early             = pSeries_init_early,
 501         .show_cpuinfo           = pSeries_show_cpuinfo,
 502         .log_error              = pSeries_log_error,
 503         .pcibios_fixup          = pSeries_final_fixup,
 504         .pci_probe_mode         = pSeries_pci_probe_mode,
 505         .restart                = rtas_restart,
 506         .power_off              = pSeries_power_off,
 507         .halt                   = rtas_halt,
 508         .panic                  = rtas_os_term,
 509         .get_boot_time          = rtas_get_boot_time,
 510         .get_rtc_time           = rtas_get_rtc_time,
 511         .set_rtc_time           = rtas_set_rtc_time,
 512         .calibrate_decr         = generic_calibrate_decr,
 513         .progress               = rtas_progress,
 514         .system_reset_exception = pSeries_system_reset_exception,
 515         .machine_check_exception = pSeries_machine_check_exception,
 516 };