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/export.h>
  21 #include <linux/mm.h>
  22 #include <linux/stddef.h>
  23 #include <linux/unistd.h>
  24 #include <linux/ptrace.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/memblock.h>
  46
  47 #include <asm/processor.h>
  48 #include <asm/sections.h>
  49 #include <asm/prom.h>
  50 #include <asm/pgtable.h>
  51 #include <asm/io.h>
  52 #include <asm/pci-bridge.h>
  53 #include <asm/iommu.h>
  54 #include <asm/machdep.h>
  55 #include <asm/dma.h>
  56 #include <asm/cputable.h>
  57 #include <asm/time.h>
  58 #include <asm/mpic.h>
  59 #include <asm/rtas.h>
  60 #include <asm/udbg.h>
  61 #include <asm/nvram.h>
  62
  63 #include "maple.h"
  64
  65 #ifdef DEBUG
  66 #define DBG(fmt...) udbg_printf(fmt)
  67 #else
  68 #define DBG(fmt...)
  69 #endif
  70
  71 static unsigned long maple_find_nvram_base(void)
  72 {
  73         struct device_node *rtcs;
  74         unsigned long result = 0;
  75
  76         /* find NVRAM device */
  77         rtcs = of_find_compatible_node(NULL, "nvram", "AMD8111");
  78         if (rtcs) {
  79                 struct resource r;
  80                 if (of_address_to_resource(rtcs, 0, &r)) {
  81                         printk(KERN_EMERG "Maple: Unable to translate NVRAM"
  82                                " address\n");
  83                         goto bail;
  84                 }
  85                 if (!(r.flags & IORESOURCE_IO)) {
  86                         printk(KERN_EMERG "Maple: NVRAM address isn't PIO!\n");
  87                         goto bail;
  88                 }
  89                 result = r.start;
  90         } else
  91                 printk(KERN_EMERG "Maple: Unable to find NVRAM\n");
  92  bail:
  93         of_node_put(rtcs);
  94         return result;
  95 }
  96
  97 static void maple_restart(char *cmd)
  98 {
  99         unsigned int maple_nvram_base;
 100         const unsigned int *maple_nvram_offset, *maple_nvram_command;
 101         struct device_node *sp;
 102
 103         maple_nvram_base = maple_find_nvram_base();
 104         if (maple_nvram_base == 0)
 105                 goto fail;
 106
 107         /* find service processor device */
 108         sp = of_find_node_by_name(NULL, "service-processor");
 109         if (!sp) {
 110                 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
 111                 goto fail;
 112         }
 113         maple_nvram_offset = of_get_property(sp, "restart-addr", NULL);
 114         maple_nvram_command = of_get_property(sp, "restart-value", NULL);
 115         of_node_put(sp);
 116
 117         /* send command */
 118         outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
 119         for (;;) ;
 120  fail:
 121         printk(KERN_EMERG "Maple: Manual Restart Required\n");
 122 }
 123
 124 static void maple_power_off(void)
 125 {
 126         unsigned int maple_nvram_base;
 127         const unsigned int *maple_nvram_offset, *maple_nvram_command;
 128         struct device_node *sp;
 129
 130         maple_nvram_base = maple_find_nvram_base();
 131         if (maple_nvram_base == 0)
 132                 goto fail;
 133
 134         /* find service processor device */
 135         sp = of_find_node_by_name(NULL, "service-processor");
 136         if (!sp) {
 137                 printk(KERN_EMERG "Maple: Unable to find Service Processor\n");
 138                 goto fail;
 139         }
 140         maple_nvram_offset = of_get_property(sp, "power-off-addr", NULL);
 141         maple_nvram_command = of_get_property(sp, "power-off-value", NULL);
 142         of_node_put(sp);
 143
 144         /* send command */
 145         outb_p(*maple_nvram_command, maple_nvram_base + *maple_nvram_offset);
 146         for (;;) ;
 147  fail:
 148         printk(KERN_EMERG "Maple: Manual Power-Down Required\n");
 149 }
 150
 151 static void maple_halt(void)
 152 {
 153         maple_power_off();
 154 }
 155
 156 #ifdef CONFIG_SMP
 157 struct smp_ops_t maple_smp_ops = {
 158         .probe          = smp_mpic_probe,
 159         .message_pass   = smp_mpic_message_pass,
 160         .kick_cpu       = smp_generic_kick_cpu,
 161         .setup_cpu      = smp_mpic_setup_cpu,
 162         .give_timebase  = smp_generic_give_timebase,
 163         .take_timebase  = smp_generic_take_timebase,
 164 };
 165 #endif /* CONFIG_SMP */
 166
 167 static void __init maple_use_rtas_reboot_and_halt_if_present(void)
 168 {
 169         if (rtas_service_present("system-reboot") &&
 170             rtas_service_present("power-off")) {
 171                 ppc_md.restart = rtas_restart;
 172                 pm_power_off = rtas_power_off;
 173                 ppc_md.halt = rtas_halt;
 174         }
 175 }
 176
 177 void __init maple_setup_arch(void)
 178 {
 179         /* init to some ~sane value until calibrate_delay() runs */
 180         loops_per_jiffy = 50000000;
 181
 182         /* Setup SMP callback */
 183 #ifdef CONFIG_SMP
 184         smp_ops = &maple_smp_ops;
 185 #endif
 186         /* Lookup PCI hosts */
 187         maple_pci_init();
 188
 189 #ifdef CONFIG_DUMMY_CONSOLE
 190         conswitchp = &dummy_con;
 191 #endif
 192         maple_use_rtas_reboot_and_halt_if_present();
 193
 194         printk(KERN_DEBUG "Using native/NAP idle loop\n");
 195
 196         mmio_nvram_init();
 197 }
 198
 199 /*
 200  * Early initialization.
 201  */
 202 static void __init maple_init_early(void)
 203 {
 204         DBG(" -> maple_init_early\n");
 205
 206         iommu_init_early_dart(&maple_pci_controller_ops);
 207
 208         DBG(" <- maple_init_early\n");
 209 }
 210
 211 /*
 212  * This is almost identical to pSeries and CHRP. We need to make that
 213  * code generic at one point, with appropriate bits in the device-tree to
 214  * identify the presence of an HT APIC
 215  */
 216 static void __init maple_init_IRQ(void)
 217 {
 218         struct device_node *root, *np, *mpic_node = NULL;
 219         const unsigned int *opprop;
 220         unsigned long openpic_addr = 0;
 221         int naddr, n, i, opplen, has_isus = 0;
 222         struct mpic *mpic;
 223         unsigned int flags = 0;
 224
 225         /* Locate MPIC in the device-tree. Note that there is a bug
 226          * in Maple device-tree where the type of the controller is
 227          * open-pic and not interrupt-controller
 228          */
 229
 230         for_each_node_by_type(np, "interrupt-controller")
 231                 if (of_device_is_compatible(np, "open-pic")) {
 232                         mpic_node = np;
 233                         break;
 234                 }
 235         if (mpic_node == NULL)
 236                 for_each_node_by_type(np, "open-pic") {
 237                         mpic_node = np;
 238                         break;
 239                 }
 240         if (mpic_node == NULL) {
 241                 printk(KERN_ERR
 242                        "Failed to locate the MPIC interrupt controller\n");
 243                 return;
 244         }
 245
 246         /* Find address list in /platform-open-pic */
 247         root = of_find_node_by_path("/");
 248         naddr = of_n_addr_cells(root);
 249         opprop = of_get_property(root, "platform-open-pic", &opplen);
 250         if (opprop != 0) {
 251                 openpic_addr = of_read_number(opprop, naddr);
 252                 has_isus = (opplen > naddr);
 253                 printk(KERN_DEBUG "OpenPIC addr: %lx, has ISUs: %d\n",
 254                        openpic_addr, has_isus);
 255         }
 256
 257         BUG_ON(openpic_addr == 0);
 258
 259         /* Check for a big endian MPIC */
 260         if (of_get_property(np, "big-endian", NULL) != NULL)
 261                 flags |= MPIC_BIG_ENDIAN;
 262
 263         /* XXX Maple specific bits */
 264         flags |= MPIC_U3_HT_IRQS;
 265         /* All U3/U4 are big-endian, older SLOF firmware doesn't encode this */
 266         flags |= MPIC_BIG_ENDIAN;
 267
 268         /* Setup the openpic driver. More device-tree junks, we hard code no
 269          * ISUs for now. I'll have to revisit some stuffs with the folks doing
 270          * the firmware for those
 271          */
 272         mpic = mpic_alloc(mpic_node, openpic_addr, flags,
 273                           /*has_isus ? 16 :*/ 0, 0, " MPIC     ");
 274         BUG_ON(mpic == NULL);
 275
 276         /* Add ISUs */
 277         opplen /= sizeof(u32);
 278         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 279                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
 280                 mpic_assign_isu(mpic, n, isuaddr);
 281         }
 282
 283         /* All ISUs are setup, complete initialization */
 284         mpic_init(mpic);
 285         ppc_md.get_irq = mpic_get_irq;
 286         of_node_put(mpic_node);
 287         of_node_put(root);
 288 }
 289
 290 static void __init maple_progress(char *s, unsigned short hex)
 291 {
 292         printk("*** %04x : %s\n", hex, s ? s : "");
 293 }
 294
 295
 296 /*
 297  * Called very early, MMU is off, device-tree isn't unflattened
 298  */
 299 static int __init maple_probe(void)
 300 {
 301         unsigned long root = of_get_flat_dt_root();
 302
 303         if (!of_flat_dt_is_compatible(root, "Momentum,Maple") &&
 304             !of_flat_dt_is_compatible(root, "Momentum,Apache"))
 305                 return 0;
 306         /*
 307          * On U3, the DART (iommu) must be allocated now since it
 308          * has an impact on htab_initialize (due to the large page it
 309          * occupies having to be broken up so the DART itself is not
 310          * part of the cacheable linar mapping
 311          */
 312         alloc_dart_table();
 313
 314         hpte_init_native();
 315         pm_power_off = maple_power_off;
 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         .halt                   = maple_halt,
 330         .get_boot_time          = maple_get_boot_time,
 331         .set_rtc_time           = maple_set_rtc_time,
 332         .get_rtc_time           = maple_get_rtc_time,
 333         .calibrate_decr         = generic_calibrate_decr,
 334         .progress               = maple_progress,
 335         .power_save             = power4_idle,
 336 };
 337
 338 #ifdef CONFIG_EDAC
 339 /*
 340  * Register a platform device for CPC925 memory controller on
 341  * all boards with U3H (CPC925) bridge.
 342  */
 343 static int __init maple_cpc925_edac_setup(void)
 344 {
 345         struct platform_device *pdev;
 346         struct device_node *np = NULL;
 347         struct resource r;
 348         int ret;
 349         volatile void __iomem *mem;
 350         u32 rev;
 351
 352         np = of_find_node_by_type(NULL, "memory-controller");
 353         if (!np) {
 354                 printk(KERN_ERR "%s: Unable to find memory-controller node\n",
 355                         __func__);
 356                 return -ENODEV;
 357         }
 358
 359         ret = of_address_to_resource(np, 0, &r);
 360         of_node_put(np);
 361
 362         if (ret < 0) {
 363                 printk(KERN_ERR "%s: Unable to get memory-controller reg\n",
 364                         __func__);
 365                 return -ENODEV;
 366         }
 367
 368         mem = ioremap(r.start, resource_size(&r));
 369         if (!mem) {
 370                 printk(KERN_ERR "%s: Unable to map memory-controller memory\n",
 371                                 __func__);
 372                 return -ENOMEM;
 373         }
 374
 375         rev = __raw_readl(mem);
 376         iounmap(mem);
 377
 378         if (rev < 0x34 || rev > 0x3f) { /* U3H */
 379                 printk(KERN_ERR "%s: Non-CPC925(U3H) bridge revision: %02x\n",
 380                         __func__, rev);
 381                 return 0;
 382         }
 383
 384         pdev = platform_device_register_simple("cpc925_edac", 0, &r, 1);
 385         if (IS_ERR(pdev))
 386                 return PTR_ERR(pdev);
 387
 388         printk(KERN_INFO "%s: CPC925 platform device created\n", __func__);
 389
 390         return 0;
 391 }
 392 machine_device_initcall(maple, maple_cpc925_edac_setup);
 393 #endif