arch/ppc64/kernel/pmac_setup.c

   1 /*
   2  *  arch/ppc/platforms/setup.c
   3  *
   4  *  PowerPC version
   5  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   6  *
   7  *  Adapted for Power Macintosh by Paul Mackerras
   8  *    Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
   9  *
  10  *  Derived from "arch/alpha/kernel/setup.c"
  11  *    Copyright (C) 1995 Linus Torvalds
  12  *
  13  *  Maintained by Benjamin Herrenschmidt (benh@kernel.crashing.org)
  14  *
  15  *  This program is free software; you can redistribute it and/or
  16  *  modify it under the terms of the GNU General Public License
  17  *  as published by the Free Software Foundation; either version
  18  *  2 of the License, or (at your option) any later version.
  19  *
  20  */
  21
  22 /*
  23  * bootup setup stuff..
  24  */
  25
  26 #undef DEBUG
  27
  28 #include <linux/config.h>
  29 #include <linux/init.h>
  30 #include <linux/errno.h>
  31 #include <linux/sched.h>
  32 #include <linux/kernel.h>
  33 #include <linux/mm.h>
  34 #include <linux/stddef.h>
  35 #include <linux/unistd.h>
  36 #include <linux/ptrace.h>
  37 #include <linux/slab.h>
  38 #include <linux/user.h>
  39 #include <linux/a.out.h>
  40 #include <linux/tty.h>
  41 #include <linux/string.h>
  42 #include <linux/delay.h>
  43 #include <linux/ioport.h>
  44 #include <linux/major.h>
  45 #include <linux/initrd.h>
  46 #include <linux/vt_kern.h>
  47 #include <linux/console.h>
  48 #include <linux/ide.h>
  49 #include <linux/pci.h>
  50 #include <linux/adb.h>
  51 #include <linux/cuda.h>
  52 #include <linux/pmu.h>
  53 #include <linux/irq.h>
  54 #include <linux/seq_file.h>
  55 #include <linux/root_dev.h>
  56 #include <linux/bitops.h>
  57
  58 #include <asm/processor.h>
  59 #include <asm/sections.h>
  60 #include <asm/prom.h>
  61 #include <asm/system.h>
  62 #include <asm/io.h>
  63 #include <asm/pci-bridge.h>
  64 #include <asm/iommu.h>
  65 #include <asm/machdep.h>
  66 #include <asm/dma.h>
  67 #include <asm/btext.h>
  68 #include <asm/cputable.h>
  69 #include <asm/pmac_feature.h>
  70 #include <asm/time.h>
  71 #include <asm/of_device.h>
  72 #include <asm/lmb.h>
  73 #include <asm/smu.h>
  74 #include <asm/pmc.h>
  75 #include <asm/mpic.h>
  76 #include <asm/udbg.h>
  77
  78 #include "pmac.h"
  79
  80 #ifdef DEBUG
  81 #define DBG(fmt...) udbg_printf(fmt)
  82 #else
  83 #define DBG(fmt...)
  84 #endif
  85
  86 static int current_root_goodness = -1;
  87 #define DEFAULT_ROOT_DEVICE Root_SDA1   /* sda1 - slightly silly choice */
  88
  89 extern  int powersave_nap;
  90 int sccdbg;
  91
  92 sys_ctrler_t sys_ctrler;
  93 EXPORT_SYMBOL(sys_ctrler);
  94
  95 #ifdef CONFIG_PMAC_SMU
  96 unsigned long smu_cmdbuf_abs;
  97 EXPORT_SYMBOL(smu_cmdbuf_abs);
  98 #endif
  99
 100 extern void udbg_init_scc(struct device_node *np);
 101
 102 static void pmac_show_cpuinfo(struct seq_file *m)
 103 {
 104         struct device_node *np;
 105         char *pp;
 106         int plen;
 107         char* mbname;
 108         int mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 109                                         PMAC_MB_INFO_MODEL, 0);
 110         unsigned int mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 111                                                  PMAC_MB_INFO_FLAGS, 0);
 112
 113         if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
 114                               (long)&mbname) != 0)
 115                 mbname = "Unknown";
 116
 117         /* find motherboard type */
 118         seq_printf(m, "machine\t\t: ");
 119         np = find_devices("device-tree");
 120         if (np != NULL) {
 121                 pp = (char *) get_property(np, "model", NULL);
 122                 if (pp != NULL)
 123                         seq_printf(m, "%s\n", pp);
 124                 else
 125                         seq_printf(m, "PowerMac\n");
 126                 pp = (char *) get_property(np, "compatible", &plen);
 127                 if (pp != NULL) {
 128                         seq_printf(m, "motherboard\t:");
 129                         while (plen > 0) {
 130                                 int l = strlen(pp) + 1;
 131                                 seq_printf(m, " %s", pp);
 132                                 plen -= l;
 133                                 pp += l;
 134                         }
 135                         seq_printf(m, "\n");
 136                 }
 137         } else
 138                 seq_printf(m, "PowerMac\n");
 139
 140         /* print parsed model */
 141         seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
 142         seq_printf(m, "pmac flags\t: %08x\n", mbflags);
 143
 144         /* Indicate newworld */
 145         seq_printf(m, "pmac-generation\t: NewWorld\n");
 146 }
 147
 148
 149 static void __init pmac_setup_arch(void)
 150 {
 151         /* init to some ~sane value until calibrate_delay() runs */
 152         loops_per_jiffy = 50000000;
 153
 154         /* Probe motherboard chipset */
 155         pmac_feature_init();
 156 #if 0
 157         /* Lock-enable the SCC channel used for debug */
 158         if (sccdbg) {
 159                 np = of_find_node_by_name(NULL, "escc");
 160                 if (np)
 161                         pmac_call_feature(PMAC_FTR_SCC_ENABLE, np,
 162                                           PMAC_SCC_ASYNC | PMAC_SCC_FLAG_XMON, 1);
 163         }
 164 #endif
 165         /* We can NAP */
 166         powersave_nap = 1;
 167
 168 #ifdef CONFIG_ADB_PMU
 169         /* Initialize the PMU if any */
 170         find_via_pmu();
 171 #endif
 172 #ifdef CONFIG_PMAC_SMU
 173         /* Initialize the SMU if any */
 174         smu_init();
 175 #endif
 176
 177         /* Init NVRAM access */
 178         pmac_nvram_init();
 179
 180         /* Setup SMP callback */
 181 #ifdef CONFIG_SMP
 182         pmac_setup_smp();
 183 #endif
 184
 185         /* Lookup PCI hosts */
 186         pmac_pci_init();
 187
 188 #ifdef CONFIG_DUMMY_CONSOLE
 189         conswitchp = &dummy_con;
 190 #endif
 191
 192         printk(KERN_INFO "Using native/NAP idle loop\n");
 193 }
 194
 195 #ifdef CONFIG_SCSI
 196 void note_scsi_host(struct device_node *node, void *host)
 197 {
 198         /* Obsolete */
 199 }
 200 #endif
 201
 202
 203 static int initializing = 1;
 204
 205 static int pmac_late_init(void)
 206 {
 207         initializing = 0;
 208         return 0;
 209 }
 210
 211 late_initcall(pmac_late_init);
 212
 213 /* can't be __init - can be called whenever a disk is first accessed */
 214 void note_bootable_part(dev_t dev, int part, int goodness)
 215 {
 216         extern dev_t boot_dev;
 217         char *p;
 218
 219         if (!initializing)
 220                 return;
 221         if ((goodness <= current_root_goodness) &&
 222             ROOT_DEV != DEFAULT_ROOT_DEVICE)
 223                 return;
 224         p = strstr(saved_command_line, "root=");
 225         if (p != NULL && (p == saved_command_line || p[-1] == ' '))
 226                 return;
 227
 228         if (!boot_dev || dev == boot_dev) {
 229                 ROOT_DEV = dev + part;
 230                 boot_dev = 0;
 231                 current_root_goodness = goodness;
 232         }
 233 }
 234
 235 static void pmac_restart(char *cmd)
 236 {
 237         switch(sys_ctrler) {
 238 #ifdef CONFIG_ADB_PMU
 239         case SYS_CTRLER_PMU:
 240                 pmu_restart();
 241                 break;
 242 #endif
 243
 244 #ifdef CONFIG_PMAC_SMU
 245         case SYS_CTRLER_SMU:
 246                 smu_restart();
 247                 break;
 248 #endif
 249         default:
 250                 ;
 251         }
 252 }
 253
 254 static void pmac_power_off(void)
 255 {
 256         switch(sys_ctrler) {
 257 #ifdef CONFIG_ADB_PMU
 258         case SYS_CTRLER_PMU:
 259                 pmu_shutdown();
 260                 break;
 261 #endif
 262 #ifdef CONFIG_PMAC_SMU
 263         case SYS_CTRLER_SMU:
 264                 smu_shutdown();
 265                 break;
 266 #endif
 267         default:
 268                 ;
 269         }
 270 }
 271
 272 static void pmac_halt(void)
 273 {
 274         pmac_power_off();
 275 }
 276
 277 #ifdef CONFIG_BOOTX_TEXT
 278 static void btext_putc(unsigned char c)
 279 {
 280         btext_drawchar(c);
 281 }
 282
 283 static void __init init_boot_display(void)
 284 {
 285         char *name;
 286         struct device_node *np = NULL;
 287         int rc = -ENODEV;
 288
 289         printk("trying to initialize btext ...\n");
 290
 291         name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
 292         if (name != NULL) {
 293                 np = of_find_node_by_path(name);
 294                 if (np != NULL) {
 295                         if (strcmp(np->type, "display") != 0) {
 296                                 printk("boot stdout isn't a display !\n");
 297                                 of_node_put(np);
 298                                 np = NULL;
 299                         }
 300                 }
 301         }
 302         if (np)
 303                 rc = btext_initialize(np);
 304         if (rc == 0)
 305                 return;
 306
 307         for (np = NULL; (np = of_find_node_by_type(np, "display"));) {
 308                 if (get_property(np, "linux,opened", NULL)) {
 309                         printk("trying %s ...\n", np->full_name);
 310                         rc = btext_initialize(np);
 311                         printk("result: %d\n", rc);
 312                 }
 313                 if (rc == 0)
 314                         return;
 315         }
 316 }
 317 #endif /* CONFIG_BOOTX_TEXT */
 318
 319 /*
 320  * Early initialization.
 321  */
 322 static void __init pmac_init_early(void)
 323 {
 324         DBG(" -> pmac_init_early\n");
 325
 326         /* Initialize hash table, from now on, we can take hash faults
 327          * and call ioremap
 328          */
 329         hpte_init_native();
 330
 331         /* Init SCC */
 332         if (strstr(cmd_line, "sccdbg")) {
 333                 sccdbg = 1;
 334                 udbg_init_scc(NULL);
 335         }
 336 #ifdef CONFIG_BOOTX_TEXT
 337         else {
 338                 init_boot_display();
 339
 340                 udbg_putc = btext_putc;
 341         }
 342 #endif /* CONFIG_BOOTX_TEXT */
 343
 344         /* Setup interrupt mapping options */
 345         ppc64_interrupt_controller = IC_OPEN_PIC;
 346
 347         iommu_init_early_u3();
 348
 349         DBG(" <- pmac_init_early\n");
 350 }
 351
 352 static int pmac_u3_cascade(struct pt_regs *regs, void *data)
 353 {
 354         return mpic_get_one_irq((struct mpic *)data, regs);
 355 }
 356
 357 static __init void pmac_init_IRQ(void)
 358 {
 359         struct device_node *irqctrler  = NULL;
 360         struct device_node *irqctrler2 = NULL;
 361         struct device_node *np = NULL;
 362         struct mpic *mpic1, *mpic2;
 363
 364         /* We first try to detect Apple's new Core99 chipset, since mac-io
 365          * is quite different on those machines and contains an IBM MPIC2.
 366          */
 367         while ((np = of_find_node_by_type(np, "open-pic")) != NULL) {
 368                 struct device_node *parent = of_get_parent(np);
 369                 if (parent && !strcmp(parent->name, "u3"))
 370                         irqctrler2 = of_node_get(np);
 371                 else
 372                         irqctrler = of_node_get(np);
 373                 of_node_put(parent);
 374         }
 375         if (irqctrler != NULL && irqctrler->n_addrs > 0) {
 376                 unsigned char senses[128];
 377
 378                 printk(KERN_INFO "PowerMac using OpenPIC irq controller at 0x%08x\n",
 379                        (unsigned int)irqctrler->addrs[0].address);
 380
 381                 prom_get_irq_senses(senses, 0, 128);
 382                 mpic1 = mpic_alloc(irqctrler->addrs[0].address,
 383                                    MPIC_PRIMARY | MPIC_WANTS_RESET,
 384                                    0, 0, 128, 256, senses, 128, " K2-MPIC  ");
 385                 BUG_ON(mpic1 == NULL);
 386                 mpic_init(mpic1);
 387
 388                 if (irqctrler2 != NULL && irqctrler2->n_intrs > 0 &&
 389                     irqctrler2->n_addrs > 0) {
 390                         printk(KERN_INFO "Slave OpenPIC at 0x%08x hooked on IRQ %d\n",
 391                                (u32)irqctrler2->addrs[0].address,
 392                                irqctrler2->intrs[0].line);
 393
 394                         pmac_call_feature(PMAC_FTR_ENABLE_MPIC, irqctrler2, 0, 0);
 395                         prom_get_irq_senses(senses, 128, 128 + 128);
 396
 397                         /* We don't need to set MPIC_BROKEN_U3 here since we don't have
 398                          * hypertransport interrupts routed to it
 399                          */
 400                         mpic2 = mpic_alloc(irqctrler2->addrs[0].address,
 401                                            MPIC_BIG_ENDIAN | MPIC_WANTS_RESET,
 402                                            0, 128, 128, 0, senses, 128, " U3-MPIC  ");
 403                         BUG_ON(mpic2 == NULL);
 404                         mpic_init(mpic2);
 405                         mpic_setup_cascade(irqctrler2->intrs[0].line,
 406                                            pmac_u3_cascade, mpic2);
 407                 }
 408         }
 409         of_node_put(irqctrler);
 410         of_node_put(irqctrler2);
 411 }
 412
 413 static void __init pmac_progress(char *s, unsigned short hex)
 414 {
 415         if (sccdbg) {
 416                 udbg_puts(s);
 417                 udbg_puts("\n");
 418         }
 419 #ifdef CONFIG_BOOTX_TEXT
 420         else if (boot_text_mapped) {
 421                 btext_drawstring(s);
 422                 btext_drawstring("\n");
 423         }
 424 #endif /* CONFIG_BOOTX_TEXT */
 425 }
 426
 427 /*
 428  * pmac has no legacy IO, anything calling this function has to
 429  * fail or bad things will happen
 430  */
 431 static int pmac_check_legacy_ioport(unsigned int baseport)
 432 {
 433         return -ENODEV;
 434 }
 435
 436 static int __init pmac_declare_of_platform_devices(void)
 437 {
 438         struct device_node *np, *npp;
 439
 440         npp = of_find_node_by_name(NULL, "u3");
 441         if (npp) {
 442                 for (np = NULL; (np = of_get_next_child(npp, np)) != NULL;) {
 443                         if (strncmp(np->name, "i2c", 3) == 0) {
 444                                 of_platform_device_create(np, "u3-i2c", NULL);
 445                                 of_node_put(np);
 446                                 break;
 447                         }
 448                 }
 449                 of_node_put(npp);
 450         }
 451         npp = of_find_node_by_type(NULL, "smu");
 452         if (npp) {
 453                 of_platform_device_create(npp, "smu", NULL);
 454                 of_node_put(npp);
 455         }
 456
 457         return 0;
 458 }
 459
 460 device_initcall(pmac_declare_of_platform_devices);
 461
 462 /*
 463  * Called very early, MMU is off, device-tree isn't unflattened
 464  */
 465 static int __init pmac_probe(int platform)
 466 {
 467         if (platform != PLATFORM_POWERMAC)
 468                 return 0;
 469         /*
 470          * On U3, the DART (iommu) must be allocated now since it
 471          * has an impact on htab_initialize (due to the large page it
 472          * occupies having to be broken up so the DART itself is not
 473          * part of the cacheable linar mapping
 474          */
 475         alloc_u3_dart_table();
 476
 477 #ifdef CONFIG_PMAC_SMU
 478         /*
 479          * SMU based G5s need some memory below 2Gb, at least the current
 480          * driver needs that. We have to allocate it now. We allocate 4k
 481          * (1 small page) for now.
 482          */
 483         smu_cmdbuf_abs = lmb_alloc_base(4096, 4096, 0x80000000UL);
 484 #endif /* CONFIG_PMAC_SMU */
 485
 486         return 1;
 487 }
 488
 489 static int pmac_probe_mode(struct pci_bus *bus)
 490 {
 491         struct device_node *node = bus->sysdata;
 492
 493         /* We need to use normal PCI probing for the AGP bus,
 494            since the device for the AGP bridge isn't in the tree. */
 495         if (bus->self == NULL && device_is_compatible(node, "u3-agp"))
 496                 return PCI_PROBE_NORMAL;
 497
 498         return PCI_PROBE_DEVTREE;
 499 }
 500
 501 struct machdep_calls __initdata pmac_md = {
 502 #ifdef CONFIG_HOTPLUG_CPU
 503         .cpu_die                = generic_mach_cpu_die,
 504 #endif
 505         .probe                  = pmac_probe,
 506         .setup_arch             = pmac_setup_arch,
 507         .init_early             = pmac_init_early,
 508         .show_cpuinfo           = pmac_show_cpuinfo,
 509         .init_IRQ               = pmac_init_IRQ,
 510         .get_irq                = mpic_get_irq,
 511         .pcibios_fixup          = pmac_pcibios_fixup,
 512         .pci_probe_mode         = pmac_probe_mode,
 513         .restart                = pmac_restart,
 514         .power_off              = pmac_power_off,
 515         .halt                   = pmac_halt,
 516         .get_boot_time          = pmac_get_boot_time,
 517         .set_rtc_time           = pmac_set_rtc_time,
 518         .get_rtc_time           = pmac_get_rtc_time,
 519         .calibrate_decr         = pmac_calibrate_decr,
 520         .feature_call           = pmac_do_feature_call,
 521         .progress               = pmac_progress,
 522         .check_legacy_ioport    = pmac_check_legacy_ioport,
 523         .idle_loop              = native_idle,
 524         .enable_pmcs            = power4_enable_pmcs,
 525 };