LXR linux/arch/powerpc/platforms/maple/setup.c

   1/*
   2 *  Maple (970 eval board) setup code
   3 *
   4 *  (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org),
   5 *                     IBM Corp. 
   6 *
   7 *  This program is free software; you can redistribute it and/or
   8 *  modify it under the terms of the GNU General Public License
   9 *  as published by the Free Software Foundation; either version
  10 *  2 of the License, or (at your option) any later version.
  11 *
  12 */
  13
  14#undef DEBUG
  15
  16#include <linux/init.h>
  17#include <linux/errno.h>
  18#include <linux/sched.h>
  19#include <linux/kernel.h>
  20#include <linux/mm.h>
  21#include <linux/stddef.h>
  22#include <linux/unistd.h>
  23#include <linux/ptrace.h>
  24#include <linux/slab.h>
  25#include <linux/user.h>
  26#include <linux/tty.h>
  27#include <linux/string.h>
  28#include <linux/delay.h>
  29#include <linux/ioport.h>
  30#include <linux/major.h>
  31#include <linux/initrd.h>
  32#include <linux/vt_kern.h>
  33#include <linux/console.h>
  34#include <linux/pci.h>
  35#include <linux/adb.h>
  36#include <linux/cuda.h>
  37#include <linux/pmu.h>
  38#include <linux/irq.h>
  39#include <linux/seq_file.h>
  40#include <linux/root_dev.h>
  41#include <linux/serial.h>
  42#include <linux/smp.h>
  43#include <linux/bitops.h>
  44#include <linux/of_device.h>
  45#include <linux/lmb.h>
  46
  47#include <asm/processor.h>
  48#include <asm/sections.h>
  49#include <asm/prom.h>
  50#include <asm/system.h>
  51#include <asm/pgtable.h>
  52#include <asm/io.h>
  53#include <asm/pci-bridge.h>
  54#include <asm/iommu.h>
  55#include <asm/machdep.h>
  56#include <asm/dma.h>
  57#include <asm/cputable.h>
  58#include <asm/time.h>
  59#include <asm/mpic.h>
  60#include <asm/rtas.h>
  61#include <asm/udbg.h>
  62#include <asm/nvram.h>
  63
  64#include "maple.h"
  65
  66#ifdef DEBUG
  67#define DBG(fmt...) udbg_printf(fmt)
  68#else
  69#define DBG(fmt...)
  70#endif
  71
  72static unsigned long maple_find_nvram_base(void)
  73{
  74        struct device_node *rtcs;
  75        unsigned long result = 0;
  76
  77        /* find NVRAM device */
  78        rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
  79        if (rtcs) {
  80                struct resource r;
  81                if (of_address_to_resource(rtcs, 0, &r)) {
  82                        printk(KERN_EMERG "Maple: Unable to translate NVRAM"
  83                               " address\n");
  84                        goto bail;
  85                }
  86                if (!(r.flags & IORESOURCE_IO)) {
  87                        printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
  88                        goto bail;
  89                }
  90                result = r.start;
  91        } else
  92                printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
  93 bail:
  94        of_node_put(rtcs);
  95        return result;
  96}
  97
  98static void maple_restart(char *cmd)
  99{
 100        unsigned int maple_nvram_base;
 101        const unsigned int *maple_nvram_offset, *maple_nvram_command;
 102        struct device_node *sp;
 103
 104        maple_nvram_base = maple_find_nvram_base();
 105        if (maple_nvram_base == 0)
 106                goto fail;
 107
 108        /* find service processor device */
 109        sp = of_find_node_by_name(NULL, "service-processor");
 110        if (!sp) {
 111                printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
 112                goto fail;
 113        }
 114        maple_nvram_offset = of_get_property(sp, "restart-addr", NULL);
 115        maple_nvram_command = of_get_property(sp, "restart-value", NULL);
 116        of_node_put(sp);
 117
 118        /* send command */
 119        outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
 120        for (;;) ;
 121 fail:
 122        printk(KERN_EMERG "Maple: Manual Restart Required\n");
 123}
 124
 125static void maple_power_off(void)
 126{
 127        unsigned int maple_nvram_base;
 128        const unsigned int *maple_nvram_offset, *maple_nvram_command;
 129        struct device_node *sp;
 130
 131        maple_nvram_base = maple_find_nvram_base();
 132        if (maple_nvram_base == 0)
 133                goto fail;
 134
 135        /* find service processor device */
 136        sp = of_find_node_by_name(NULL, "service-processor");
 137        if (!sp) {
 138                printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
 139                goto fail;
 140        }
 141        maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL);
 142        maple_nvram_command = of_get_property(sp, "power-off-value", NULL);
 143        of_node_put(sp);
 144
 145        /* send command */
 146        outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
 147        for (;;) ;
 148 fail:
 149        printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
 150}
 151
 152static void maple_halt(void)
 153{
 154        maple_power_off();
 155}
 156
 157#ifdef CONFIG_SMP
 158struct smp_ops_t maple_smp_ops = {
 159        .probe          = smp_mpic_probe,
 160        .message_pass   = smp_mpic_message_pass,
 161        .kick_cpu       = smp_generic_kick_cpu,
 162        .setup_cpu      = smp_mpic_setup_cpu,
 163        .give_timebase  = smp_generic_give_timebase,
 164        .take_timebase  = smp_generic_take_timebase,
 165};
 166#endif /* CONFIG_SMP */
 167
 168static void __init maple_use_rtas_reboot_and_halt_if_present(void)
 169{
 170        if (rtas_service_present("system-reboot") &&
 171            rtas_service_present("power-off")) {
 172                ppc_md.restart = rtas_restart;
 173                ppc_md.power_off = rtas_power_off;
 174                ppc_md.halt = rtas_halt;
 175        }
 176}
 177
 178void __init maple_setup_arch(void)
 179{
 180        /* init to some ~sane value until calibrate_delay() runs */
 181        loops_per_jiffy = 50000000;
 182
 183        /* Setup SMP callback */
 184#ifdef CONFIG_SMP
 185        smp_ops = &maple_smp_ops;
 186#endif
 187        /* Lookup PCI hosts */
 188        maple_pci_init();
 189
 190#ifdef CONFIG_DUMMY_CONSOLE
 191        conswitchp = &dummy_con;
 192#endif
 193        maple_use_rtas_reboot_and_halt_if_present();
 194
 195        printk(KERN_DEBUG "Using native/NAP idle loop\n");
 196
 197        mmio_nvram_init();
 198}
 199
 200/* 
 201 * Early initialization.
 202 */
 203static void __init maple_init_early(void)
 204{
 205        DBG(" -> maple_init_early\n");
 206
 207        iommu_init_early_dart();
 208
 209        DBG(" <- maple_init_early\n");
 210}
 211
 212/*
 213 * This is almost identical to pSeries and CHRP. We need to make that
 214 * code generic at one point, with appropriate bits in the device-tree to
 215 * identify the presence of an HT APIC
 216 */
 217static void __init maple_init_IRQ(void)
 218{
 219        struct device_node *root, *np, *mpic_node = NULL;
 220        const unsigned int *opprop;
 221        unsigned long openpic_addr = 0;
 222        int naddr, n, i, opplen, has_isus = 0;
 223        struct mpic *mpic;
 224        unsigned int flags = MPIC_PRIMARY;
 225
 226        /* Locate MPIC in the device-tree. Note that there is a bug
 227         * in Maple device-tree where the type of the controller is
 228         * open-pic and not interrupt-controller
 229         */
 230
 231        for_each_node_by_type(np, "interrupt-controller")
 232                if (of_device_is_compatible(np, "open-pic")) {
 233                        mpic_node = np;
 234                        break;
 235                }
 236        if (mpic_node == NULL)
 237                for_each_node_by_type(np, "open-pic") {
 238                        mpic_node = np;
 239                        break;
 240                }
 241        if (mpic_node == NULL) {
 242                printk(KERN_ERR
 243                       "Failed to locate the MPIC interrupt controller\n");
 244                return;
 245        }
 246
 247        /* Find address list in /platform-open-pic */
 248        root = of_find_node_by_path("/");
 249        naddr = of_n_addr_cells(root);
 250        opprop = of_get_property(root, "platform-open-pic", &opplen);
 251        if (opprop != 0) {
 252                openpic_addr = of_read_number(opprop, naddr);
 253                has_isus = (opplen > naddr);
 254                printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
 255                       openpic_addr, has_isus);
 256        }
 257
 258        BUG_ON(openpic_addr == 0);
 259
 260        /* Check for a big endian MPIC */
 261        if (of_get_property(np, "big-endian", NULL) != NULL)
 262                flags |= MPIC_BIG_ENDIAN;
 263
 264        /* XXX Maple specific bits */
 265        flags |= MPIC_U3_HT_IRQS | MPIC_WANTS_RESET;
 266        /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
 267        flags |= MPIC_BIG_ENDIAN;
 268
 269        /* Setup the openpic driver. More device-tree junks, we hard code no
 270         * ISUs for now. I'll have to revisit some stuffs with the folks doing
 271         * the firmware for those
 272         */
 273        mpic = mpic_alloc(mpic_node, openpic_addr, flags,
 274                          /*has_isus ? 16 :*/ 0, 0, " MPIC     ");
 275        BUG_ON(mpic == NULL);
 276
 277        /* Add ISUs */
 278        opplen /= sizeof(u32);
 279        for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 280                unsigned long isuaddr = of_read_number(opprop + i, naddr);
 281                mpic_assign_isu(mpic, n, isuaddr);
 282        }
 283
 284        /* All ISUs are setup, complete initialization */
 285        mpic_init(mpic);
 286        ppc_md.get_irq = mpic_get_irq;
 287        of_node_put(mpic_node);
 288        of_node_put(root);
 289}
 290
 291static void __init maple_progress(char *s, unsigned short hex)
 292{
 293        printk("*** %04x : %s\n", hex, s ? s : "");
 294}
 295
 296
 297/*
 298 * Called very early, MMU is off, device-tree isn't unflattened
 299 */
 300static int __init maple_probe(void)
 301{
 302        unsigned long root = of_get_flat_dt_root();
 303
 304        if (!of_flat_dt_is_compatible(root, "Momentum,Maple") &&
 305            !of_flat_dt_is_compatible(root, "Momentum,Apache"))
 306                return 0;
 307        /*
 308         * On U3, the DART (iommu) must be allocated now since it
 309         * has an impact on htab_initialize (due to the large page it
 310         * occupies having to be broken up so the DART itself is not
 311         * part of the cacheable linar mapping
 312         */
 313        alloc_dart_table();
 314
 315        hpte_init_native();
 316
 317        return 1;
 318}
 319
 320define_machine(maple) {
 321        .name                   = "Maple",
 322        .probe                  = maple_probe,
 323        .setup_arch             = maple_setup_arch,
 324        .init_early             = maple_init_early,
 325        .init_IRQ               = maple_init_IRQ,
 326        .pci_irq_fixup          = maple_pci_irq_fixup,
 327        .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq,
 328        .restart                = maple_restart,
 329        .power_off              = maple_power_off,
 330        .halt                   = maple_halt,
 331        .get_boot_time          = maple_get_boot_time,
 332        .set_rtc_time           = maple_set_rtc_time,
 333        .get_rtc_time           = maple_get_rtc_time,
 334        .calibrate_decr         = generic_calibrate_decr,
 335        .progress               = maple_progress,
 336        .power_save             = power4_idle,
 337};
 338
 339#ifdef CONFIG_EDAC
 340/*
 341 * Register a platform device for CPC925 memory controller on
 342 * Motorola ATCA-6101 blade.
 343 */
 344#define MAPLE_CPC925_MODEL      "Motorola,ATCA-6101"
 345static int __init maple_cpc925_edac_setup(void)
 346{
 347        struct platform_device *pdev;
 348        struct device_node *np = NULL;
 349        struct resource r;
 350        const unsigned char *model;
 351        int ret;
 352
 353        np = of_find_node_by_path("/");
 354        if (!np) {
 355                printk(KERN_ERR "%s: Unable to get root node\n", __func__);
 356                return -ENODEV;
 357        }
 358
 359        model = (const unsigned char *)of_get_property(np, "model", NULL);
 360        if (!model) {
 361                printk(KERN_ERR "%s: Unabel to get model info\n", __func__);
 362                return -ENODEV;
 363        }
 364
 365        ret = strcmp(model, MAPLE_CPC925_MODEL);
 366        of_node_put(np);
 367
 368        if (ret != 0)
 369                return 0;
 370
 371        np = of_find_node_by_type(NULL, "memory-controller");
 372        if (!np) {
 373                printk(KERN_ERR "%s: Unable to find memory-controller node\n",
 374                        __func__);
 375                return -ENODEV;
 376        }
 377
 378        ret = of_address_to_resource(np, 0, &r);
 379        of_node_put(np);
 380
 381        if (ret < 0) {
 382                printk(KERN_ERR "%s: Unable to get memory-controller reg\n",
 383                        __func__);
 384                return -ENODEV;
 385        }
 386
 387        pdev = platform_device_register_simple("cpc925_edac", 0, &r, 1);
 388        if (IS_ERR(pdev))
 389                return PTR_ERR(pdev);
 390
 391        printk(KERN_INFO "%s: CPC925 platform device created\n", __func__);
 392
 393        return 0;
 394}
 395machine_device_initcall(maple, maple_cpc925_edac_setup);
 396#endif
 397