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
  72 static 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
  98 static 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
 125 static 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
 152 static void maple_halt(void)
 153 {
 154         maple_power_off();
 155 }
 156
 157 #ifdef CONFIG_SMP
 158 struct 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
 168 static 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
 178 void __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  */
 203 static 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  */
 217 static 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
 291 static 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  */
 300 static 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
 320 define_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 };