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
  57 #include <asm/processor.h>
  58 #include <asm/sections.h>
  59 #include <asm/prom.h>
  60 #include <asm/system.h>
  61 #include <asm/pgtable.h>
  62 #include <asm/bitops.h>
  63 #include <asm/io.h>
  64 #include <asm/pci-bridge.h>
  65 #include <asm/iommu.h>
  66 #include <asm/machdep.h>
  67 #include <asm/dma.h>
  68 #include <asm/btext.h>
  69 #include <asm/cputable.h>
  70 #include <asm/pmac_feature.h>
  71 #include <asm/time.h>
  72 #include <asm/of_device.h>
  73 #include <asm/lmb.h>
  74
  75 #include "pmac.h"
  76
  77 #ifdef DEBUG
  78 #define DBG(fmt...) udbg_printf(fmt)
  79 #else
  80 #define DBG(fmt...)
  81 #endif
  82
  83
  84 static int current_root_goodness = -1;
  85 #define DEFAULT_ROOT_DEVICE Root_SDA1   /* sda1 - slightly silly choice */
  86
  87 extern  int powersave_nap;
  88 int sccdbg;
  89
  90 extern void udbg_init_scc(struct device_node *np);
  91
  92 void __pmac pmac_show_cpuinfo(struct seq_file *m)
  93 {
  94         struct device_node *np;
  95         char *pp;
  96         int plen;
  97         char* mbname;
  98         int mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
  99                                         PMAC_MB_INFO_MODEL, 0);
 100         unsigned int mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 101                                                  PMAC_MB_INFO_FLAGS, 0);
 102
 103         if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
 104                               (long)&mbname) != 0)
 105                 mbname = "Unknown";
 106
 107         /* find motherboard type */
 108         seq_printf(m, "machine\t\t: ");
 109         np = find_devices("device-tree");
 110         if (np != NULL) {
 111                 pp = (char *) get_property(np, "model", NULL);
 112                 if (pp != NULL)
 113                         seq_printf(m, "%s\n", pp);
 114                 else
 115                         seq_printf(m, "PowerMac\n");
 116                 pp = (char *) get_property(np, "compatible", &plen);
 117                 if (pp != NULL) {
 118                         seq_printf(m, "motherboard\t:");
 119                         while (plen > 0) {
 120                                 int l = strlen(pp) + 1;
 121                                 seq_printf(m, " %s", pp);
 122                                 plen -= l;
 123                                 pp += l;
 124                         }
 125                         seq_printf(m, "\n");
 126                 }
 127         } else
 128                 seq_printf(m, "PowerMac\n");
 129
 130         /* print parsed model */
 131         seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
 132         seq_printf(m, "pmac flags\t: %08x\n", mbflags);
 133
 134         /* Indicate newworld */
 135         seq_printf(m, "pmac-generation\t: NewWorld\n");
 136 }
 137
 138
 139 void __init pmac_setup_arch(void)
 140 {
 141         /* init to some ~sane value until calibrate_delay() runs */
 142         loops_per_jiffy = 50000000;
 143
 144         /* Probe motherboard chipset */
 145         pmac_feature_init();
 146 #if 0
 147         /* Lock-enable the SCC channel used for debug */
 148         if (sccdbg) {
 149                 np = of_find_node_by_name(NULL, "escc");
 150                 if (np)
 151                         pmac_call_feature(PMAC_FTR_SCC_ENABLE, np,
 152                                           PMAC_SCC_ASYNC | PMAC_SCC_FLAG_XMON, 1);
 153         }
 154 #endif
 155         /* We can NAP */
 156         powersave_nap = 1;
 157
 158         /* Initialize the PMU */
 159         find_via_pmu();
 160
 161         /* Init NVRAM access */
 162         pmac_nvram_init();
 163
 164         /* Setup SMP callback */
 165 #ifdef CONFIG_SMP
 166         pmac_setup_smp();
 167 #endif
 168
 169         /* Setup the PCI DMA to "direct" by default. May be overriden
 170          * by iommu later on
 171          */
 172         pci_dma_init_direct();
 173
 174         /* Lookup PCI hosts */
 175         pmac_pci_init();
 176
 177 #ifdef CONFIG_DUMMY_CONSOLE
 178         conswitchp = &dummy_con;
 179 #endif
 180 }
 181
 182 #ifdef CONFIG_SCSI
 183 void note_scsi_host(struct device_node *node, void *host)
 184 {
 185         /* Obsolete */
 186 }
 187 #endif
 188
 189
 190 static int initializing = 1;
 191
 192 static int pmac_late_init(void)
 193 {
 194         initializing = 0;
 195         return 0;
 196 }
 197
 198 late_initcall(pmac_late_init);
 199
 200 /* can't be __init - can be called whenever a disk is first accessed */
 201 void __pmac note_bootable_part(dev_t dev, int part, int goodness)
 202 {
 203         extern dev_t boot_dev;
 204         char *p;
 205
 206         if (!initializing)
 207                 return;
 208         if ((goodness <= current_root_goodness) &&
 209             ROOT_DEV != DEFAULT_ROOT_DEVICE)
 210                 return;
 211         p = strstr(saved_command_line, "root=");
 212         if (p != NULL && (p == saved_command_line || p[-1] == ' '))
 213                 return;
 214
 215         if (!boot_dev || dev == boot_dev) {
 216                 ROOT_DEV = dev + part;
 217                 boot_dev = 0;
 218                 current_root_goodness = goodness;
 219         }
 220 }
 221
 222 void __pmac pmac_restart(char *cmd)
 223 {
 224         pmu_restart();
 225 }
 226
 227 void __pmac pmac_power_off(void)
 228 {
 229         pmu_shutdown();
 230 }
 231
 232 void __pmac pmac_halt(void)
 233 {
 234         pmac_power_off();
 235 }
 236
 237 #ifdef CONFIG_BOOTX_TEXT
 238 static int dummy_getc_poll(void)
 239 {
 240         return -1;
 241 }
 242
 243 static unsigned char dummy_getc(void)
 244 {
 245         return 0;
 246 }
 247
 248 static void btext_putc(unsigned char c)
 249 {
 250         btext_drawchar(c);
 251 }
 252 #endif /* CONFIG_BOOTX_TEXT */
 253
 254 static void __init init_boot_display(void)
 255 {
 256         char *name;
 257         struct device_node *np = NULL;
 258         int rc = -ENODEV;
 259
 260         printk("trying to initialize btext ...\n");
 261
 262         name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
 263         if (name != NULL) {
 264                 np = of_find_node_by_path(name);
 265                 if (np != NULL) {
 266                         if (strcmp(np->type, "display") != 0) {
 267                                 printk("boot stdout isn't a display !\n");
 268                                 of_node_put(np);
 269                                 np = NULL;
 270                         }
 271                 }
 272         }
 273         if (np)
 274                 rc = btext_initialize(np);
 275         if (rc == 0)
 276                 return;
 277
 278         for (np = NULL; (np = of_find_node_by_type(np, "display"));) {
 279                 if (get_property(np, "linux,opened", NULL)) {
 280                         printk("trying %s ...\n", np->full_name);
 281                         rc = btext_initialize(np);
 282                         printk("result: %d\n", rc);
 283                 }
 284                 if (rc == 0)
 285                         return;
 286         }
 287 }
 288
 289 /*
 290  * Early initialization.
 291  */
 292 void __init pmac_init_early(void)
 293 {
 294         DBG(" -> pmac_init_early\n");
 295
 296         /* Initialize hash table, from now on, we can take hash faults
 297          * and call ioremap
 298          */
 299         hpte_init_native();
 300
 301         /* Init SCC */
 302         if (strstr(cmd_line, "sccdbg")) {
 303                 sccdbg = 1;
 304                 udbg_init_scc(NULL);
 305         }
 306
 307         else {
 308 #ifdef CONFIG_BOOTX_TEXT
 309                 init_boot_display();
 310
 311                 ppc_md.udbg_putc = btext_putc;
 312                 ppc_md.udbg_getc = dummy_getc;
 313                 ppc_md.udbg_getc_poll = dummy_getc_poll;
 314 #endif /* CONFIG_BOOTX_TEXT */
 315         }
 316
 317         /* Setup interrupt mapping options */
 318         naca->interrupt_controller = IC_OPEN_PIC;
 319
 320         DBG(" <- pmac_init_early\n");
 321 }
 322
 323 extern void* OpenPIC_Addr;
 324 extern void* OpenPIC2_Addr;
 325 extern u_int OpenPIC_NumInitSenses;
 326 extern u_char *OpenPIC_InitSenses;
 327 extern void openpic_init(int main_pic, int offset, unsigned char* chrp_ack,
 328                          int programmer_switch_irq);
 329 extern void openpic2_init(int offset);
 330 extern int openpic_get_irq(struct pt_regs *regs);
 331 extern int openpic2_get_irq(struct pt_regs *regs);
 332
 333 static int pmac_cascade_irq = -1;
 334
 335 static irqreturn_t pmac_u3_do_cascade(int cpl, void *dev_id, struct pt_regs *regs)
 336 {
 337         int irq;
 338
 339         for (;;) {
 340                 irq = openpic2_get_irq(regs);
 341                 if (irq == -1)
 342                         break;
 343                 ppc_irq_dispatch_handler(regs, irq);
 344         }
 345         return IRQ_HANDLED;
 346 }
 347
 348 static __init void pmac_init_IRQ(void)
 349 {
 350         struct device_node *irqctrler  = NULL;
 351         struct device_node *irqctrler2 = NULL;
 352         struct device_node *np = NULL;
 353
 354         /* We first try to detect Apple's new Core99 chipset, since mac-io
 355          * is quite different on those machines and contains an IBM MPIC2.
 356          */
 357         while ((np = of_find_node_by_type(np, "open-pic")) != NULL) {
 358                 struct device_node *parent = of_get_parent(np);
 359                 if (parent && !strcmp(parent->name, "u3"))
 360                         irqctrler2 = of_node_get(np);
 361                 else
 362                         irqctrler = of_node_get(np);
 363                 of_node_put(parent);
 364         }
 365         if (irqctrler != NULL && irqctrler->n_addrs > 0) {
 366                 unsigned char senses[128];
 367
 368                 printk(KERN_INFO "PowerMac using OpenPIC irq controller at 0x%08x\n",
 369                        (unsigned int)irqctrler->addrs[0].address);
 370
 371                 prom_get_irq_senses(senses, 0, 128);
 372                 OpenPIC_InitSenses = senses;
 373                 OpenPIC_NumInitSenses = 128;
 374                 OpenPIC_Addr = ioremap(irqctrler->addrs[0].address,
 375                                        irqctrler->addrs[0].size);
 376                 openpic_init(1, 0, NULL, -1);
 377
 378                 if (irqctrler2 != NULL && irqctrler2->n_intrs > 0 &&
 379                     irqctrler2->n_addrs > 0) {
 380                         printk(KERN_INFO "Slave OpenPIC at 0x%08x hooked on IRQ %d\n",
 381                                (u32)irqctrler2->addrs[0].address,
 382                                irqctrler2->intrs[0].line);
 383                         pmac_call_feature(PMAC_FTR_ENABLE_MPIC, irqctrler2, 0, 0);
 384                         OpenPIC2_Addr = ioremap(irqctrler2->addrs[0].address,
 385                                                 irqctrler2->addrs[0].size);
 386                         prom_get_irq_senses(senses, 128, 128 + 128);
 387                         OpenPIC_InitSenses = senses;
 388                         OpenPIC_NumInitSenses = 128;
 389                         openpic2_init(128);
 390                         pmac_cascade_irq = irqctrler2->intrs[0].line;
 391                 }
 392         }
 393         of_node_put(irqctrler);
 394         of_node_put(irqctrler2);
 395 }
 396
 397 /* We cannot do request_irq too early ... Right now, we get the
 398  * cascade as a core_initcall, which should be fine for our needs
 399  */
 400 static int __init pmac_irq_cascade_init(void)
 401 {
 402         if (request_irq(pmac_cascade_irq, pmac_u3_do_cascade, 0,
 403                         "U3->K2 Cascade", NULL))
 404                 printk(KERN_ERR "Unable to get OpenPIC IRQ for cascade\n");
 405         return 0;
 406 }
 407
 408 core_initcall(pmac_irq_cascade_init);
 409
 410 static void __init pmac_progress(char *s, unsigned short hex)
 411 {
 412         if (sccdbg) {
 413                 udbg_puts(s);
 414                 udbg_puts("\n");
 415         }
 416 #ifdef CONFIG_BOOTX_TEXT
 417         else if (boot_text_mapped) {
 418                 btext_drawstring(s);
 419                 btext_drawstring("\n");
 420         }
 421 #endif /* CONFIG_BOOTX_TEXT */
 422 }
 423
 424 static int __init pmac_declare_of_platform_devices(void)
 425 {
 426         struct device_node *np;
 427
 428         np = find_devices("u3");
 429         if (np) {
 430                 for (np = np->child; np != NULL; np = np->sibling)
 431                         if (strncmp(np->name, "i2c", 3) == 0) {
 432                                 of_platform_device_create(np, "u3-i2c");
 433                                 break;
 434                         }
 435         }
 436
 437         return 0;
 438 }
 439
 440 device_initcall(pmac_declare_of_platform_devices);
 441
 442 /*
 443  * Called very early, MMU is off, device-tree isn't unflattened
 444  */
 445 static int __init pmac_probe(int platform)
 446 {
 447         if (platform != PLATFORM_POWERMAC)
 448                 return 0;
 449
 450         /*
 451          * On U3, the DART (iommu) must be allocated now since it
 452          * has an impact on htab_initialize (due to the large page it
 453          * occupies having to be broken up so the DART itself is not
 454          * part of the cacheable linar mapping
 455          */
 456         alloc_u3_dart_table();
 457
 458         return 1;
 459 }
 460
 461 struct machdep_calls __initdata pmac_md = {
 462         .probe                  = pmac_probe,
 463         .setup_arch             = pmac_setup_arch,
 464         .init_early             = pmac_init_early,
 465         .get_cpuinfo            = pmac_show_cpuinfo,
 466         .init_IRQ               = pmac_init_IRQ,
 467         .get_irq                = openpic_get_irq,
 468         .pcibios_fixup          = pmac_pcibios_fixup,
 469         .restart                = pmac_restart,
 470         .power_off              = pmac_power_off,
 471         .halt                   = pmac_halt,
 472         .get_boot_time          = pmac_get_boot_time,
 473         .set_rtc_time           = pmac_set_rtc_time,
 474         .get_rtc_time           = pmac_get_rtc_time,
 475         .calibrate_decr         = pmac_calibrate_decr,
 476         .feature_call           = pmac_do_feature_call,
 477         .progress               = pmac_progress,
 478 };