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/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/mpic.h>
  61 #include <asm/rtas.h>
  62 #include <asm/udbg.h>
  63 #include <asm/nvram.h>
  64
  65 #include "maple.h"
  66
  67 #ifdef DEBUG
  68 #define DBG(fmt...) udbg_printf(fmt)
  69 #else
  70 #define DBG(fmt...)
  71 #endif
  72
  73 static unsigned long maple_find_nvram_base(void)
  74 {
  75         struct device_node *rtcs;
  76         unsigned long result = 0;
  77
  78         /* find NVRAM device */
  79         rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
  80         if (rtcs) {
  81                 struct resource r;
  82                 if (of_address_to_resource(rtcs, 0, &r)) {
  83                         printk(KERN_EMERG "Maple: Unable to translate NVRAM"
  84                                " address\n");
  85                         goto bail;
  86                 }
  87                 if (!(r.flags & IORESOURCE_IO)) {
  88                         printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
  89                         goto bail;
  90                 }
  91                 result = r.start;
  92         } else
  93                 printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
  94  bail:
  95         of_node_put(rtcs);
  96         return result;
  97 }
  98
  99 static void maple_restart(char *cmd)
 100 {
 101         unsigned int maple_nvram_base;
 102         const unsigned int *maple_nvram_offset, *maple_nvram_command;
 103         struct device_node *sp;
 104
 105         maple_nvram_base = maple_find_nvram_base();
 106         if (maple_nvram_base == 0)
 107                 goto fail;
 108
 109         /* find service processor device */
 110         sp = of_find_node_by_name(NULL, "service-processor");
 111         if (!sp) {
 112                 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
 113                 goto fail;
 114         }
 115         maple_nvram_offset = of_get_property(sp, "restart-addr", NULL);
 116         maple_nvram_command = of_get_property(sp, "restart-value", NULL);
 117         of_node_put(sp);
 118
 119         /* send command */
 120         outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
 121         for (;;) ;
 122  fail:
 123         printk(KERN_EMERG "Maple: Manual Restart Required\n");
 124 }
 125
 126 static void maple_power_off(void)
 127 {
 128         unsigned int maple_nvram_base;
 129         const unsigned int *maple_nvram_offset, *maple_nvram_command;
 130         struct device_node *sp;
 131
 132         maple_nvram_base = maple_find_nvram_base();
 133         if (maple_nvram_base == 0)
 134                 goto fail;
 135
 136         /* find service processor device */
 137         sp = of_find_node_by_name(NULL, "service-processor");
 138         if (!sp) {
 139                 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
 140                 goto fail;
 141         }
 142         maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL);
 143         maple_nvram_command = of_get_property(sp, "power-off-value", NULL);
 144         of_node_put(sp);
 145
 146         /* send command */
 147         outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
 148         for (;;) ;
 149  fail:
 150         printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
 151 }
 152
 153 static void maple_halt(void)
 154 {
 155         maple_power_off();
 156 }
 157
 158 #ifdef CONFIG_SMP
 159 struct smp_ops_t maple_smp_ops = {
 160         .probe          = smp_mpic_probe,
 161         .message_pass   = smp_mpic_message_pass,
 162         .kick_cpu       = smp_generic_kick_cpu,
 163         .setup_cpu      = smp_mpic_setup_cpu,
 164         .give_timebase  = smp_generic_give_timebase,
 165         .take_timebase  = smp_generic_take_timebase,
 166 };
 167 #endif /* CONFIG_SMP */
 168
 169 static void __init maple_use_rtas_reboot_and_halt_if_present(void)
 170 {
 171         if (rtas_service_present("system-reboot") &&
 172             rtas_service_present("power-off")) {
 173                 ppc_md.restart = rtas_restart;
 174                 ppc_md.power_off = rtas_power_off;
 175                 ppc_md.halt = rtas_halt;
 176         }
 177 }
 178
 179 void __init maple_setup_arch(void)
 180 {
 181         /* init to some ~sane value until calibrate_delay() runs */
 182         loops_per_jiffy = 50000000;
 183
 184         /* Setup SMP callback */
 185 #ifdef CONFIG_SMP
 186         smp_ops = &maple_smp_ops;
 187 #endif
 188         /* Lookup PCI hosts */
 189         maple_pci_init();
 190
 191 #ifdef CONFIG_DUMMY_CONSOLE
 192         conswitchp = &dummy_con;
 193 #endif
 194         maple_use_rtas_reboot_and_halt_if_present();
 195
 196         printk(KERN_DEBUG "Using native/NAP idle loop\n");
 197
 198         mmio_nvram_init();
 199 }
 200
 201 /*
 202  * Early initialization.
 203  */
 204 static void __init maple_init_early(void)
 205 {
 206         DBG(" -> maple_init_early\n");
 207
 208         iommu_init_early_dart();
 209
 210         DBG(" <- maple_init_early\n");
 211 }
 212
 213 /*
 214  * This is almost identical to pSeries and CHRP. We need to make that
 215  * code generic at one point, with appropriate bits in the device-tree to
 216  * identify the presence of an HT APIC
 217  */
 218 static void __init maple_init_IRQ(void)
 219 {
 220         struct device_node *root, *np, *mpic_node = NULL;
 221         const unsigned int *opprop;
 222         unsigned long openpic_addr = 0;
 223         int naddr, n, i, opplen, has_isus = 0;
 224         struct mpic *mpic;
 225         unsigned int flags = MPIC_PRIMARY;
 226
 227         /* Locate MPIC in the device-tree. Note that there is a bug
 228          * in Maple device-tree where the type of the controller is
 229          * open-pic and not interrupt-controller
 230          */
 231
 232         for_each_node_by_type(np, "interrupt-controller")
 233                 if (of_device_is_compatible(np, "open-pic")) {
 234                         mpic_node = np;
 235                         break;
 236                 }
 237         if (mpic_node == NULL)
 238                 for_each_node_by_type(np, "open-pic") {
 239                         mpic_node = np;
 240                         break;
 241                 }
 242         if (mpic_node == NULL) {
 243                 printk(KERN_ERR
 244                        "Failed to locate the MPIC interrupt controller\n");
 245                 return;
 246         }
 247
 248         /* Find address list in /platform-open-pic */
 249         root = of_find_node_by_path("/");
 250         naddr = of_n_addr_cells(root);
 251         opprop = of_get_property(root, "platform-open-pic", &opplen);
 252         if (opprop != 0) {
 253                 openpic_addr = of_read_number(opprop, naddr);
 254                 has_isus = (opplen > naddr);
 255                 printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
 256                        openpic_addr, has_isus);
 257         }
 258
 259         BUG_ON(openpic_addr == 0);
 260
 261         /* Check for a big endian MPIC */
 262         if (of_get_property(np, "big-endian", NULL) != NULL)
 263                 flags |= MPIC_BIG_ENDIAN;
 264
 265         /* XXX Maple specific bits */
 266         flags |= MPIC_U3_HT_IRQS | MPIC_WANTS_RESET;
 267         /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
 268         flags |= MPIC_BIG_ENDIAN;
 269
 270         /* Setup the openpic driver. More device-tree junks, we hard code no
 271          * ISUs for now. I'll have to revisit some stuffs with the folks doing
 272          * the firmware for those
 273          */
 274         mpic = mpic_alloc(mpic_node, openpic_addr, flags,
 275                           /*has_isus ? 16 :*/ 0, 0, " MPIC     ");
 276         BUG_ON(mpic == NULL);
 277
 278         /* Add ISUs */
 279         opplen /= sizeof(u32);
 280         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 281                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
 282                 mpic_assign_isu(mpic, n, isuaddr);
 283         }
 284
 285         /* All ISUs are setup, complete initialization */
 286         mpic_init(mpic);
 287         ppc_md.get_irq = mpic_get_irq;
 288         of_node_put(mpic_node);
 289         of_node_put(root);
 290 }
 291
 292 static void __init maple_progress(char *s, unsigned short hex)
 293 {
 294         printk("*** %04x : %s\n", hex, s ? s : "");
 295 }
 296
 297
 298 /*
 299  * Called very early, MMU is off, device-tree isn't unflattened
 300  */
 301 static int __init maple_probe(void)
 302 {
 303         unsigned long root = of_get_flat_dt_root();
 304
 305         if (!of_flat_dt_is_compatible(root, "Momentum,Maple") &&
 306             !of_flat_dt_is_compatible(root, "Momentum,Apache"))
 307                 return 0;
 308         /*
 309          * On U3, the DART (iommu) must be allocated now since it
 310          * has an impact on htab_initialize (due to the large page it
 311          * occupies having to be broken up so the DART itself is not
 312          * part of the cacheable linar mapping
 313          */
 314         alloc_dart_table();
 315
 316         hpte_init_native();
 317
 318         return 1;
 319 }
 320
 321 define_machine(maple) {
 322         .name                   = "Maple",
 323         .probe                  = maple_probe,
 324         .setup_arch             = maple_setup_arch,
 325         .init_early             = maple_init_early,
 326         .init_IRQ               = maple_init_IRQ,
 327         .pci_irq_fixup          = maple_pci_irq_fixup,
 328         .pci_get_legacy_ide_irq = maple_pci_get_legacy_ide_irq,
 329         .restart                = maple_restart,
 330         .power_off              = maple_power_off,
 331         .halt                   = maple_halt,
 332         .get_boot_time          = maple_get_boot_time,
 333         .set_rtc_time           = maple_set_rtc_time,
 334         .get_rtc_time           = maple_get_rtc_time,
 335         .calibrate_decr         = generic_calibrate_decr,
 336         .progress               = maple_progress,
 337         .power_save             = power4_idle,
 338 #ifdef CONFIG_KEXEC
 339         .machine_kexec          = default_machine_kexec,
 340         .machine_kexec_prepare  = default_machine_kexec_prepare,
 341         .machine_crash_shutdown = default_machine_crash_shutdown,
 342 #endif
 343 };