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