arch/powerpc/platforms/chrp/setup.c

   1 /*
   2  *  arch/ppc/platforms/setup.c
   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  */
   8
   9 /*
  10  * bootup setup stuff..
  11  */
  12
  13 #include <linux/config.h>
  14 #include <linux/errno.h>
  15 #include <linux/sched.h>
  16 #include <linux/kernel.h>
  17 #include <linux/mm.h>
  18 #include <linux/stddef.h>
  19 #include <linux/unistd.h>
  20 #include <linux/ptrace.h>
  21 #include <linux/slab.h>
  22 #include <linux/user.h>
  23 #include <linux/a.out.h>
  24 #include <linux/tty.h>
  25 #include <linux/major.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/reboot.h>
  28 #include <linux/init.h>
  29 #include <linux/pci.h>
  30 #include <linux/version.h>
  31 #include <linux/adb.h>
  32 #include <linux/module.h>
  33 #include <linux/delay.h>
  34 #include <linux/ide.h>
  35 #include <linux/console.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/root_dev.h>
  38 #include <linux/initrd.h>
  39 #include <linux/module.h>
  40
  41 #include <asm/io.h>
  42 #include <asm/pgtable.h>
  43 #include <asm/prom.h>
  44 #include <asm/gg2.h>
  45 #include <asm/pci-bridge.h>
  46 #include <asm/dma.h>
  47 #include <asm/machdep.h>
  48 #include <asm/irq.h>
  49 #include <asm/hydra.h>
  50 #include <asm/sections.h>
  51 #include <asm/time.h>
  52 #include <asm/i8259.h>
  53 #include <asm/mpic.h>
  54 #include <asm/rtas.h>
  55 #include <asm/xmon.h>
  56
  57 #include "chrp.h"
  58
  59 void rtas_indicator_progress(char *, unsigned short);
  60
  61 int _chrp_type;
  62 EXPORT_SYMBOL(_chrp_type);
  63
  64 struct mpic *chrp_mpic;
  65
  66 /*
  67  * XXX this should be in xmon.h, but putting it there means xmon.h
  68  * has to include <linux/interrupt.h> (to get irqreturn_t), which
  69  * causes all sorts of problems.  -- paulus
  70  */
  71 extern irqreturn_t xmon_irq(int, void *, struct pt_regs *);
  72
  73 extern unsigned long loops_per_jiffy;
  74
  75 #ifdef CONFIG_SMP
  76 extern struct smp_ops_t chrp_smp_ops;
  77 #endif
  78
  79 static const char *gg2_memtypes[4] = {
  80         "FPM", "SDRAM", "EDO", "BEDO"
  81 };
  82 static const char *gg2_cachesizes[4] = {
  83         "256 KB", "512 KB", "1 MB", "Reserved"
  84 };
  85 static const char *gg2_cachetypes[4] = {
  86         "Asynchronous", "Reserved", "Flow-Through Synchronous",
  87         "Pipelined Synchronous"
  88 };
  89 static const char *gg2_cachemodes[4] = {
  90         "Disabled", "Write-Through", "Copy-Back", "Transparent Mode"
  91 };
  92
  93 void chrp_show_cpuinfo(struct seq_file *m)
  94 {
  95         int i, sdramen;
  96         unsigned int t;
  97         struct device_node *root;
  98         const char *model = "";
  99
 100         root = find_path_device("/");
 101         if (root)
 102                 model = get_property(root, "model", NULL);
 103         seq_printf(m, "machine\t\t: CHRP %s\n", model);
 104
 105         /* longtrail (goldengate) stuff */
 106         if (!strncmp(model, "IBM,LongTrail", 13)) {
 107                 /* VLSI VAS96011/12 `Golden Gate 2' */
 108                 /* Memory banks */
 109                 sdramen = (in_le32(gg2_pci_config_base + GG2_PCI_DRAM_CTRL)
 110                            >>31) & 1;
 111                 for (i = 0; i < (sdramen ? 4 : 6); i++) {
 112                         t = in_le32(gg2_pci_config_base+
 113                                                  GG2_PCI_DRAM_BANK0+
 114                                                  i*4);
 115                         if (!(t & 1))
 116                                 continue;
 117                         switch ((t>>8) & 0x1f) {
 118                         case 0x1f:
 119                                 model = "4 MB";
 120                                 break;
 121                         case 0x1e:
 122                                 model = "8 MB";
 123                                 break;
 124                         case 0x1c:
 125                                 model = "16 MB";
 126                                 break;
 127                         case 0x18:
 128                                 model = "32 MB";
 129                                 break;
 130                         case 0x10:
 131                                 model = "64 MB";
 132                                 break;
 133                         case 0x00:
 134                                 model = "128 MB";
 135                                 break;
 136                         default:
 137                                 model = "Reserved";
 138                                 break;
 139                         }
 140                         seq_printf(m, "memory bank %d\t: %s %s\n", i, model,
 141                                    gg2_memtypes[sdramen ? 1 : ((t>>1) & 3)]);
 142                 }
 143                 /* L2 cache */
 144                 t = in_le32(gg2_pci_config_base+GG2_PCI_CC_CTRL);
 145                 seq_printf(m, "board l2\t: %s %s (%s)\n",
 146                            gg2_cachesizes[(t>>7) & 3],
 147                            gg2_cachetypes[(t>>2) & 3],
 148                            gg2_cachemodes[t & 3]);
 149         }
 150 }
 151
 152 /*
 153  *  Fixes for the National Semiconductor PC78308VUL SuperI/O
 154  *
 155  *  Some versions of Open Firmware incorrectly initialize the IRQ settings
 156  *  for keyboard and mouse
 157  */
 158 static inline void __init sio_write(u8 val, u8 index)
 159 {
 160         outb(index, 0x15c);
 161         outb(val, 0x15d);
 162 }
 163
 164 static inline u8 __init sio_read(u8 index)
 165 {
 166         outb(index, 0x15c);
 167         return inb(0x15d);
 168 }
 169
 170 static void __init sio_fixup_irq(const char *name, u8 device, u8 level,
 171                                      u8 type)
 172 {
 173         u8 level0, type0, active;
 174
 175         /* select logical device */
 176         sio_write(device, 0x07);
 177         active = sio_read(0x30);
 178         level0 = sio_read(0x70);
 179         type0 = sio_read(0x71);
 180         if (level0 != level || type0 != type || !active) {
 181                 printk(KERN_WARNING "sio: %s irq level %d, type %d, %sactive: "
 182                        "remapping to level %d, type %d, active\n",
 183                        name, level0, type0, !active ? "in" : "", level, type);
 184                 sio_write(0x01, 0x30);
 185                 sio_write(level, 0x70);
 186                 sio_write(type, 0x71);
 187         }
 188 }
 189
 190 static void __init sio_init(void)
 191 {
 192         struct device_node *root;
 193
 194         if ((root = find_path_device("/")) &&
 195             !strncmp(get_property(root, "model", NULL), "IBM,LongTrail", 13)) {
 196                 /* logical device 0 (KBC/Keyboard) */
 197                 sio_fixup_irq("keyboard", 0, 1, 2);
 198                 /* select logical device 1 (KBC/Mouse) */
 199                 sio_fixup_irq("mouse", 1, 12, 2);
 200         }
 201 }
 202
 203
 204 static void __init pegasos_set_l2cr(void)
 205 {
 206         struct device_node *np;
 207
 208         /* On Pegasos, enable the l2 cache if needed, as the OF forgets it */
 209         if (_chrp_type != _CHRP_Pegasos)
 210                 return;
 211
 212         /* Enable L2 cache if needed */
 213         np = find_type_devices("cpu");
 214         if (np != NULL) {
 215                 unsigned int *l2cr = (unsigned int *)
 216                         get_property (np, "l2cr", NULL);
 217                 if (l2cr == NULL) {
 218                         printk ("Pegasos l2cr : no cpu l2cr property found\n");
 219                         return;
 220                 }
 221                 if (!((*l2cr) & 0x80000000)) {
 222                         printk ("Pegasos l2cr : L2 cache was not active, "
 223                                 "activating\n");
 224                         _set_L2CR(0);
 225                         _set_L2CR((*l2cr) | 0x80000000);
 226                 }
 227         }
 228 }
 229
 230 void __init chrp_setup_arch(void)
 231 {
 232         struct device_node *root = find_path_device ("/");
 233         char *machine = NULL;
 234         struct device_node *device;
 235         unsigned int *p = NULL;
 236
 237         /* init to some ~sane value until calibrate_delay() runs */
 238         loops_per_jiffy = 50000000/HZ;
 239
 240         if (root)
 241                 machine = get_property(root, "model", NULL);
 242         if (machine && strncmp(machine, "Pegasos", 7) == 0) {
 243                 _chrp_type = _CHRP_Pegasos;
 244         } else if (machine && strncmp(machine, "IBM", 3) == 0) {
 245                 _chrp_type = _CHRP_IBM;
 246         } else if (machine && strncmp(machine, "MOT", 3) == 0) {
 247                 _chrp_type = _CHRP_Motorola;
 248         } else {
 249                 /* Let's assume it is an IBM chrp if all else fails */
 250                 _chrp_type = _CHRP_IBM;
 251         }
 252         printk("chrp type = %x\n", _chrp_type);
 253
 254         rtas_initialize();
 255         if (rtas_token("display-character") >= 0)
 256                 ppc_md.progress = rtas_progress;
 257
 258         /* use RTAS time-of-day routines if available */
 259         if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) {
 260                 ppc_md.get_boot_time    = rtas_get_boot_time;
 261                 ppc_md.get_rtc_time     = rtas_get_rtc_time;
 262                 ppc_md.set_rtc_time     = rtas_set_rtc_time;
 263         }
 264
 265 #ifdef CONFIG_BLK_DEV_INITRD
 266         /* this is fine for chrp */
 267         initrd_below_start_ok = 1;
 268
 269         if (initrd_start)
 270                 ROOT_DEV = Root_RAM0;
 271         else
 272 #endif
 273                 ROOT_DEV = Root_SDA2; /* sda2 (sda1 is for the kernel) */
 274
 275         /* On pegasos, enable the L2 cache if not already done by OF */
 276         pegasos_set_l2cr();
 277
 278         /* Lookup PCI host bridges */
 279         chrp_find_bridges();
 280
 281         /*
 282          *  Temporary fixes for PCI devices.
 283          *  -- Geert
 284          */
 285         hydra_init();           /* Mac I/O */
 286
 287         /*
 288          *  Fix the Super I/O configuration
 289          */
 290         sio_init();
 291
 292         /* Get the event scan rate for the rtas so we know how
 293          * often it expects a heartbeat. -- Cort
 294          */
 295         device = find_devices("rtas");
 296         if (device)
 297                 p = (unsigned int *) get_property
 298                         (device, "rtas-event-scan-rate", NULL);
 299         if (p && *p) {
 300                 ppc_md.heartbeat = chrp_event_scan;
 301                 ppc_md.heartbeat_reset = HZ / (*p * 30) - 1;
 302                 ppc_md.heartbeat_count = 1;
 303                 printk("RTAS Event Scan Rate: %u (%lu jiffies)\n",
 304                        *p, ppc_md.heartbeat_reset);
 305         }
 306
 307         pci_create_OF_bus_map();
 308
 309         /*
 310          * Print the banner, then scroll down so boot progress
 311          * can be printed.  -- Cort
 312          */
 313         if (ppc_md.progress) ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0x0);
 314 }
 315
 316 void
 317 chrp_event_scan(void)
 318 {
 319         unsigned char log[1024];
 320         int ret = 0;
 321
 322         /* XXX: we should loop until the hardware says no more error logs -- Cort */
 323         rtas_call(rtas_token("event-scan"), 4, 1, &ret, 0xffffffff, 0,
 324                   __pa(log), 1024);
 325         ppc_md.heartbeat_count = ppc_md.heartbeat_reset;
 326 }
 327
 328 /*
 329  * Finds the open-pic node and sets up the mpic driver.
 330  */
 331 static void __init chrp_find_openpic(void)
 332 {
 333         struct device_node *np, *root;
 334         int len, i, j, irq_count;
 335         int isu_size, idu_size;
 336         unsigned int *iranges, *opprop = NULL;
 337         int oplen = 0;
 338         unsigned long opaddr;
 339         int na = 1;
 340         unsigned char init_senses[NR_IRQS - NUM_8259_INTERRUPTS];
 341
 342         np = find_type_devices("open-pic");
 343         if (np == NULL)
 344                 return;
 345         root = find_path_device("/");
 346         if (root) {
 347                 opprop = (unsigned int *) get_property
 348                         (root, "platform-open-pic", &oplen);
 349                 na = prom_n_addr_cells(root);
 350         }
 351         if (opprop && oplen >= na * sizeof(unsigned int)) {
 352                 opaddr = opprop[na-1];  /* assume 32-bit */
 353                 oplen /= na * sizeof(unsigned int);
 354         } else {
 355                 struct resource r;
 356                 if (of_address_to_resource(np, 0, &r))
 357                         return;
 358                 opaddr = r.start;
 359                 oplen = 0;
 360         }
 361
 362         printk(KERN_INFO "OpenPIC at %lx\n", opaddr);
 363
 364         irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
 365         prom_get_irq_senses(init_senses, NUM_ISA_INTERRUPTS, NR_IRQS - 4);
 366         /* i8259 cascade is always positive level */
 367         init_senses[0] = IRQ_SENSE_LEVEL | IRQ_POLARITY_POSITIVE;
 368
 369         iranges = (unsigned int *) get_property(np, "interrupt-ranges", &len);
 370         if (iranges == NULL)
 371                 len = 0;        /* non-distributed mpic */
 372         else
 373                 len /= 2 * sizeof(unsigned int);
 374
 375         /*
 376          * The first pair of cells in interrupt-ranges refers to the
 377          * IDU; subsequent pairs refer to the ISUs.
 378          */
 379         if (oplen < len) {
 380                 printk(KERN_ERR "Insufficient addresses for distributed"
 381                        " OpenPIC (%d < %d)\n", oplen, len);
 382                 len = oplen;
 383         }
 384
 385         isu_size = 0;
 386         idu_size = 0;
 387         if (len > 0 && iranges[1] != 0) {
 388                 printk(KERN_INFO "OpenPIC irqs %d..%d in IDU\n",
 389                        iranges[0], iranges[0] + iranges[1] - 1);
 390                 idu_size = iranges[1];
 391         }
 392         if (len > 1)
 393                 isu_size = iranges[3];
 394
 395         chrp_mpic = mpic_alloc(opaddr, MPIC_PRIMARY,
 396                                isu_size, NUM_ISA_INTERRUPTS, irq_count,
 397                                NR_IRQS - 4, init_senses, irq_count,
 398                                " MPIC    ");
 399         if (chrp_mpic == NULL) {
 400                 printk(KERN_ERR "Failed to allocate MPIC structure\n");
 401                 return;
 402         }
 403
 404         j = na - 1;
 405         for (i = 1; i < len; ++i) {
 406                 iranges += 2;
 407                 j += na;
 408                 printk(KERN_INFO "OpenPIC irqs %d..%d in ISU at %x\n",
 409                        iranges[0], iranges[0] + iranges[1] - 1,
 410                        opprop[j]);
 411                 mpic_assign_isu(chrp_mpic, i - 1, opprop[j]);
 412         }
 413
 414         mpic_init(chrp_mpic);
 415         mpic_setup_cascade(NUM_ISA_INTERRUPTS, i8259_irq_cascade, NULL);
 416 }
 417
 418 #if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(XMON)
 419 static struct irqaction xmon_irqaction = {
 420         .handler = xmon_irq,
 421         .mask = CPU_MASK_NONE,
 422         .name = "XMON break",
 423 };
 424 #endif
 425
 426 void __init chrp_init_IRQ(void)
 427 {
 428         struct device_node *np;
 429         unsigned long chrp_int_ack = 0;
 430 #if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(XMON)
 431         struct device_node *kbd;
 432 #endif
 433
 434         for (np = find_devices("pci"); np != NULL; np = np->next) {
 435                 unsigned int *addrp = (unsigned int *)
 436                         get_property(np, "8259-interrupt-acknowledge", NULL);
 437
 438                 if (addrp == NULL)
 439                         continue;
 440                 chrp_int_ack = addrp[prom_n_addr_cells(np)-1];
 441                 break;
 442         }
 443         if (np == NULL)
 444                 printk(KERN_ERR "Cannot find PCI interrupt acknowledge address\n");
 445
 446         chrp_find_openpic();
 447
 448         i8259_init(chrp_int_ack, 0);
 449
 450         if (_chrp_type == _CHRP_Pegasos)
 451                 ppc_md.get_irq        = i8259_irq;
 452         else
 453                 ppc_md.get_irq        = mpic_get_irq;
 454
 455 #if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(XMON)
 456         /* see if there is a keyboard in the device tree
 457            with a parent of type "adb" */
 458         for (kbd = find_devices("keyboard"); kbd; kbd = kbd->next)
 459                 if (kbd->parent && kbd->parent->type
 460                     && strcmp(kbd->parent->type, "adb") == 0)
 461                         break;
 462         if (kbd)
 463                 setup_irq(HYDRA_INT_ADB_NMI, &xmon_irqaction);
 464 #endif
 465 }
 466
 467 void __init
 468 chrp_init2(void)
 469 {
 470 #ifdef CONFIG_NVRAM
 471         chrp_nvram_init();
 472 #endif
 473
 474         request_region(0x20,0x20,"pic1");
 475         request_region(0xa0,0x20,"pic2");
 476         request_region(0x00,0x20,"dma1");
 477         request_region(0x40,0x20,"timer");
 478         request_region(0x80,0x10,"dma page reg");
 479         request_region(0xc0,0x20,"dma2");
 480
 481         if (ppc_md.progress)
 482                 ppc_md.progress("  Have fun!    ", 0x7777);
 483 }
 484
 485 void __init chrp_init(void)
 486 {
 487         ISA_DMA_THRESHOLD = ~0L;
 488         DMA_MODE_READ = 0x44;
 489         DMA_MODE_WRITE = 0x48;
 490         isa_io_base = CHRP_ISA_IO_BASE;         /* default value */
 491         ppc_do_canonicalize_irqs = 1;
 492
 493         /* Assume we have an 8259... */
 494         __irq_offset_value = NUM_ISA_INTERRUPTS;
 495
 496         ppc_md.setup_arch     = chrp_setup_arch;
 497         ppc_md.show_cpuinfo   = chrp_show_cpuinfo;
 498
 499         ppc_md.init_IRQ       = chrp_init_IRQ;
 500         ppc_md.init           = chrp_init2;
 501
 502         ppc_md.phys_mem_access_prot = pci_phys_mem_access_prot;
 503
 504         ppc_md.restart        = rtas_restart;
 505         ppc_md.power_off      = rtas_power_off;
 506         ppc_md.halt           = rtas_halt;
 507
 508         ppc_md.time_init      = chrp_time_init;
 509         ppc_md.calibrate_decr = generic_calibrate_decr;
 510
 511         /* this may get overridden with rtas routines later... */
 512         ppc_md.set_rtc_time   = chrp_set_rtc_time;
 513         ppc_md.get_rtc_time   = chrp_get_rtc_time;
 514
 515 #ifdef CONFIG_SMP
 516         smp_ops = &chrp_smp_ops;
 517 #endif /* CONFIG_SMP */
 518 }