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/a.out.h>
  27 #include <linux/tty.h>
  28 #include <linux/string.h>
  29 #include <linux/delay.h>
  30 #include <linux/ioport.h>
  31 #include <linux/major.h>
  32 #include <linux/initrd.h>
  33 #include <linux/vt_kern.h>
  34 #include <linux/console.h>
  35 #include <linux/ide.h>
  36 #include <linux/pci.h>
  37 #include <linux/adb.h>
  38 #include <linux/cuda.h>
  39 #include <linux/pmu.h>
  40 #include <linux/irq.h>
  41 #include <linux/seq_file.h>
  42 #include <linux/root_dev.h>
  43 #include <linux/serial.h>
  44 #include <linux/smp.h>
  45
  46 #include <asm/processor.h>
  47 #include <asm/sections.h>
  48 #include <asm/prom.h>
  49 #include <asm/system.h>
  50 #include <asm/pgtable.h>
  51 #include <asm/bitops.h>
  52 #include <asm/io.h>
  53 #include <asm/kexec.h>
  54 #include <asm/pci-bridge.h>
  55 #include <asm/iommu.h>
  56 #include <asm/machdep.h>
  57 #include <asm/dma.h>
  58 #include <asm/cputable.h>
  59 #include <asm/time.h>
  60 #include <asm/of_device.h>
  61 #include <asm/lmb.h>
  62 #include <asm/mpic.h>
  63 #include <asm/rtas.h>
  64 #include <asm/udbg.h>
  65 #include <asm/nvram.h>
  66
  67 #include "maple.h"
  68
  69 #ifdef DEBUG
  70 #define DBG(fmt...) udbg_printf(fmt)
  71 #else
  72 #define DBG(fmt...)
  73 #endif
  74
  75 static unsigned long maple_find_nvram_base(void)
  76 {
  77         struct device_node *rtcs;
  78         unsigned long result = 0;
  79
  80         /* find NVRAM device */
  81         rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
  82         if (rtcs) {
  83                 struct resource r;
  84                 if (of_address_to_resource(rtcs, 0, &r)) {
  85                         printk(KERN_EMERG "Maple: Unable to translate NVRAM"
  86                                " address\n");
  87                         goto bail;
  88                 }
  89                 if (!(r.flags & IORESOURCE_IO)) {
  90                         printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
  91                         goto bail;
  92                 }
  93                 result = r.start;
  94         } else
  95                 printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
  96  bail:
  97         of_node_put(rtcs);
  98         return result;
  99 }
 100
 101 static void maple_restart(char *cmd)
 102 {
 103         unsigned int maple_nvram_base;
 104         const unsigned int *maple_nvram_offset, *maple_nvram_command;
 105         struct device_node *sp;
 106
 107         maple_nvram_base = maple_find_nvram_base();
 108         if (maple_nvram_base == 0)
 109                 goto fail;
 110
 111         /* find service processor device */
 112         sp = of_find_node_by_name(NULL, "service-processor");
 113         if (!sp) {
 114                 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
 115                 goto fail;
 116         }
 117         maple_nvram_offset = get_property(sp, "restart-addr", NULL);
 118         maple_nvram_command = get_property(sp, "restart-value", NULL);
 119         of_node_put(sp);
 120
 121         /* send command */
 122         outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
 123         for (;;) ;
 124  fail:
 125         printk(KERN_EMERG "Maple: Manual Restart Required\n");
 126 }
 127
 128 static void maple_power_off(void)
 129 {
 130         unsigned int maple_nvram_base;
 131         const unsigned int *maple_nvram_offset, *maple_nvram_command;
 132         struct device_node *sp;
 133
 134         maple_nvram_base = maple_find_nvram_base();
 135         if (maple_nvram_base == 0)
 136                 goto fail;
 137
 138         /* find service processor device */
 139         sp = of_find_node_by_name(NULL, "service-processor");
 140         if (!sp) {
 141                 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
 142                 goto fail;
 143         }
 144         maple_nvram_offset = get_property(sp, "power-off-addr", NULL);
 145         maple_nvram_command = get_property(sp, "power-off-value", NULL);
 146         of_node_put(sp);
 147
 148         /* send command */
 149         outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
 150         for (;;) ;
 151  fail:
 152         printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
 153 }
 154
 155 static void maple_halt(void)
 156 {
 157         maple_power_off();
 158 }
 159
 160 #ifdef CONFIG_SMP
 161 struct smp_ops_t maple_smp_ops = {
 162         .probe          = smp_mpic_probe,
 163         .message_pass   = smp_mpic_message_pass,
 164         .kick_cpu       = smp_generic_kick_cpu,
 165         .setup_cpu      = smp_mpic_setup_cpu,
 166         .give_timebase  = smp_generic_give_timebase,
 167         .take_timebase  = smp_generic_take_timebase,
 168 };
 169 #endif /* CONFIG_SMP */
 170
 171 static void __init maple_use_rtas_reboot_and_halt_if_present(void)
 172 {
 173         if (rtas_service_present("system-reboot") &&
 174             rtas_service_present("power-off")) {
 175                 ppc_md.restart = rtas_restart;
 176                 ppc_md.power_off = rtas_power_off;
 177                 ppc_md.halt = rtas_halt;
 178         }
 179 }
 180
 181 void __init maple_setup_arch(void)
 182 {
 183         /* init to some ~sane value until calibrate_delay() runs */
 184         loops_per_jiffy = 50000000;
 185
 186         /* Setup SMP callback */
 187 #ifdef CONFIG_SMP
 188         smp_ops = &maple_smp_ops;
 189 #endif
 190         /* Lookup PCI hosts */
 191         maple_pci_init();
 192
 193 #ifdef CONFIG_DUMMY_CONSOLE
 194         conswitchp = &dummy_con;
 195 #endif
 196         maple_use_rtas_reboot_and_halt_if_present();
 197
 198         printk(KERN_DEBUG "Using native/NAP idle loop\n");
 199
 200         mmio_nvram_init();
 201 }
 202
 203 /*
 204  * Early initialization.
 205  */
 206 static void __init maple_init_early(void)
 207 {
 208         DBG(" -> maple_init_early\n");
 209
 210         iommu_init_early_dart();
 211
 212         DBG(" <- maple_init_early\n");
 213 }
 214
 215 /*
 216  * This is almost identical to pSeries and CHRP. We need to make that
 217  * code generic at one point, with appropriate bits in the device-tree to
 218  * identify the presence of an HT APIC
 219  */
 220 static void __init maple_init_IRQ(void)
 221 {
 222         struct device_node *root, *np, *mpic_node = NULL;
 223         const unsigned int *opprop;
 224         unsigned long openpic_addr = 0;
 225         int naddr, n, i, opplen, has_isus = 0;
 226         struct mpic *mpic;
 227         unsigned int flags = MPIC_PRIMARY;
 228
 229         /* Locate MPIC in the device-tree. Note that there is a bug
 230          * in Maple device-tree where the type of the controller is
 231          * open-pic and not interrupt-controller
 232          */
 233
 234         for_each_node_by_type(np, "interrupt-controller")
 235                 if (device_is_compatible(np, "open-pic")) {
 236                         mpic_node = np;
 237                         break;
 238                 }
 239         if (mpic_node == NULL)
 240                 for_each_node_by_type(np, "open-pic") {
 241                         mpic_node = np;
 242                         break;
 243                 }
 244         if (mpic_node == NULL) {
 245                 printk(KERN_ERR
 246                        "Failed to locate the MPIC interrupt controller\n");
 247                 return;
 248         }
 249
 250         /* Find address list in /platform-open-pic */
 251         root = of_find_node_by_path("/");
 252         naddr = prom_n_addr_cells(root);
 253         opprop = get_property(root, "platform-open-pic", &opplen);
 254         if (opprop != 0) {
 255                 openpic_addr = of_read_number(opprop, naddr);
 256                 has_isus = (opplen > naddr);
 257                 printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
 258                        openpic_addr, has_isus);
 259         }
 260
 261         BUG_ON(openpic_addr == 0);
 262
 263         /* Check for a big endian MPIC */
 264         if (get_property(np, "big-endian", NULL) != NULL)
 265                 flags |= MPIC_BIG_ENDIAN;
 266
 267         /* XXX Maple specific bits */
 268         flags |= MPIC_BROKEN_U3 | MPIC_WANTS_RESET;
 269         /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
 270         flags |= MPIC_BIG_ENDIAN;
 271
 272         /* Setup the openpic driver. More device-tree junks, we hard code no
 273          * ISUs for now. I'll have to revisit some stuffs with the folks doing
 274          * the firmware for those
 275          */
 276         mpic = mpic_alloc(mpic_node, openpic_addr, flags,
 277                           /*has_isus ? 16 :*/ 0, 0, " MPIC     ");
 278         BUG_ON(mpic == NULL);
 279
 280         /* Add ISUs */
 281         opplen /= sizeof(u32);
 282         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 283                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
 284                 mpic_assign_isu(mpic, n, isuaddr);
 285         }
 286
 287         /* All ISUs are setup, complete initialization */
 288         mpic_init(mpic);
 289         ppc_md.get_irq = mpic_get_irq;
 290         of_node_put(mpic_node);
 291         of_node_put(root);
 292 }
 293
 294 static void __init maple_progress(char *s, unsigned short hex)
 295 {
 296         printk("*** %04x : %s\n", hex, s ? s : "");
 297 }
 298
 299
 300 /*
 301  * Called very early, MMU is off, device-tree isn't unflattened
 302  */
 303 static int __init maple_probe(void)
 304 {
 305         unsigned long root = of_get_flat_dt_root();
 306
 307         if (!of_flat_dt_is_compatible(root, "Momentum,Maple") &&
 308             !of_flat_dt_is_compatible(root, "Momentum,Apache"))
 309                 return 0;
 310         /*
 311          * On U3, the DART (iommu) must be allocated now since it
 312          * has an impact on htab_initialize (due to the large page it
 313          * occupies having to be broken up so the DART itself is not
 314          * part of the cacheable linar mapping
 315          */
 316         alloc_dart_table();
 317
 318         hpte_init_native();
 319
 320         return 1;
 321 }
 322
 323 define_machine(maple_md) {
 324         .name                   = "Maple",
 325         .probe                  = maple_probe,
 326         .setup_arch             = maple_setup_arch,
 327         .init_early             = maple_init_early,
 328         .init_IRQ               = maple_init_IRQ,
 329         .pci_irq_fixup          = maple_pci_irq_fixup,
 330         .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq,
 331         .restart                = maple_restart,
 332         .power_off              = maple_power_off,
 333         .halt                   = maple_halt,
 334         .get_boot_time          = maple_get_boot_time,
 335         .set_rtc_time           = maple_set_rtc_time,
 336         .get_rtc_time           = maple_get_rtc_time,
 337         .calibrate_decr         = generic_calibrate_decr,
 338         .progress               = maple_progress,
 339         .power_save             = power4_idle,
 340 #ifdef CONFIG_KEXEC
 341         .machine_kexec          = default_machine_kexec,
 342         .machine_kexec_prepare  = default_machine_kexec_prepare,
 343         .machine_crash_shutdown = default_machine_crash_shutdown,
 344 #endif
 345 };