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setup.c

/*
 *  Powermac setup and early boot code plus other random bits.
 *
 *  PowerPC version
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 *
 *  Adapted for Power Macintosh by Paul Mackerras
 *    Copyright (C) 1996 Paul Mackerras (paulus@samba.org)
 *
 *  Derived from "arch/alpha/kernel/setup.c"
 *    Copyright (C) 1995 Linus Torvalds
 *
 *  Maintained by Benjamin Herrenschmidt (benh@kernel.crashing.org)
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 *
 */

/*
 * bootup setup stuff..
 */

#include <linux/init.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/tty.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/major.h>
#include <linux/initrd.h>
#include <linux/vt_kern.h>
#include <linux/console.h>
#include <linux/pci.h>
#include <linux/adb.h>
#include <linux/cuda.h>
#include <linux/pmu.h>
#include <linux/irq.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/bitops.h>
#include <linux/suspend.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/lmb.h>

#include <asm/reg.h>
#include <asm/sections.h>
#include <asm/prom.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/kexec.h>
#include <asm/pci-bridge.h>
#include <asm/ohare.h>
#include <asm/mediabay.h>
#include <asm/machdep.h>
#include <asm/dma.h>
#include <asm/cputable.h>
#include <asm/btext.h>
#include <asm/pmac_feature.h>
#include <asm/time.h>
#include <asm/mmu_context.h>
#include <asm/iommu.h>
#include <asm/smu.h>
#include <asm/pmc.h>
#include <asm/udbg.h>

#include "pmac.h"

#undef SHOW_GATWICK_IRQS

int ppc_override_l2cr = 0;
int ppc_override_l2cr_value;
int has_l2cache = 0;

int pmac_newworld;

static int current_root_goodness = -1;

extern struct machdep_calls pmac_md;

#define DEFAULT_ROOT_DEVICE Root_SDA1     /* sda1 - slightly silly choice */

#ifdef CONFIG_PPC64
int sccdbg;
#endif

sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
EXPORT_SYMBOL(sys_ctrler);

#ifdef CONFIG_PMAC_SMU
unsigned long smu_cmdbuf_abs;
EXPORT_SYMBOL(smu_cmdbuf_abs);
#endif

#ifdef CONFIG_SMP
extern struct smp_ops_t psurge_smp_ops;
extern struct smp_ops_t core99_smp_ops;
#endif /* CONFIG_SMP */

static void pmac_show_cpuinfo(struct seq_file *m)
{
      struct device_node *np;
      const char *pp;
      int plen;
      int mbmodel;
      unsigned int mbflags;
      char* mbname;

      mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
                            PMAC_MB_INFO_MODEL, 0);
      mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
                            PMAC_MB_INFO_FLAGS, 0);
      if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
                        (long) &mbname) != 0)
            mbname = "Unknown";

      /* find motherboard type */
      seq_printf(m, "machine\t\t: ");
      np = of_find_node_by_path("/");
      if (np != NULL) {
            pp = of_get_property(np, "model", NULL);
            if (pp != NULL)
                  seq_printf(m, "%s\n", pp);
            else
                  seq_printf(m, "PowerMac\n");
            pp = of_get_property(np, "compatible", &plen);
            if (pp != NULL) {
                  seq_printf(m, "motherboard\t:");
                  while (plen > 0) {
                        int l = strlen(pp) + 1;
                        seq_printf(m, " %s", pp);
                        plen -= l;
                        pp += l;
                  }
                  seq_printf(m, "\n");
            }
            of_node_put(np);
      } else
            seq_printf(m, "PowerMac\n");

      /* print parsed model */
      seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
      seq_printf(m, "pmac flags\t: %08x\n", mbflags);

      /* find l2 cache info */
      np = of_find_node_by_name(NULL, "l2-cache");
      if (np == NULL)
            np = of_find_node_by_type(NULL, "cache");
      if (np != NULL) {
            const unsigned int *ic =
                  of_get_property(np, "i-cache-size", NULL);
            const unsigned int *dc =
                  of_get_property(np, "d-cache-size", NULL);
            seq_printf(m, "L2 cache\t:");
            has_l2cache = 1;
            if (of_get_property(np, "cache-unified", NULL) != 0 && dc) {
                  seq_printf(m, " %dK unified", *dc / 1024);
            } else {
                  if (ic)
                        seq_printf(m, " %dK instruction", *ic / 1024);
                  if (dc)
                        seq_printf(m, "%s %dK data",
                                 (ic? " +": ""), *dc / 1024);
            }
            pp = of_get_property(np, "ram-type", NULL);
            if (pp)
                  seq_printf(m, " %s", pp);
            seq_printf(m, "\n");
            of_node_put(np);
      }

      /* Indicate newworld/oldworld */
      seq_printf(m, "pmac-generation\t: %s\n",
               pmac_newworld ? "NewWorld" : "OldWorld");
}

#ifndef CONFIG_ADB_CUDA
int find_via_cuda(void)
{
      struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");

      if (!dn)
            return 0;
      of_node_put(dn);
      printk("WARNING ! Your machine is CUDA-based but your kernel\n");
      printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
      return 0;
}
#endif

#ifndef CONFIG_ADB_PMU
int find_via_pmu(void)
{
      struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");

      if (!dn)
            return 0;
      of_node_put(dn);
      printk("WARNING ! Your machine is PMU-based but your kernel\n");
      printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
      return 0;
}
#endif

#ifndef CONFIG_PMAC_SMU
int smu_init(void)
{
      /* should check and warn if SMU is present */
      return 0;
}
#endif

#ifdef CONFIG_PPC32
static volatile u32 *sysctrl_regs;

static void __init ohare_init(void)
{
      struct device_node *dn;

      /* this area has the CPU identification register
         and some registers used by smp boards */
      sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);

      /*
       * Turn on the L2 cache.
       * We assume that we have a PSX memory controller iff
       * we have an ohare I/O controller.
       */
      dn = of_find_node_by_name(NULL, "ohare");
      if (dn) {
            of_node_put(dn);
            if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
                  if (sysctrl_regs[4] & 0x10)
                        sysctrl_regs[4] |= 0x04000020;
                  else
                        sysctrl_regs[4] |= 0x04000000;
                  if(has_l2cache)
                        printk(KERN_INFO "Level 2 cache enabled\n");
            }
      }
}

static void __init l2cr_init(void)
{
      /* Checks "l2cr-value" property in the registry */
      if (cpu_has_feature(CPU_FTR_L2CR)) {
            struct device_node *np = of_find_node_by_name(NULL, "cpus");
            if (np == 0)
                  np = of_find_node_by_type(NULL, "cpu");
            if (np != 0) {
                  const unsigned int *l2cr =
                        of_get_property(np, "l2cr-value", NULL);
                  if (l2cr != 0) {
                        ppc_override_l2cr = 1;
                        ppc_override_l2cr_value = *l2cr;
                        _set_L2CR(0);
                        _set_L2CR(ppc_override_l2cr_value);
                  }
                  of_node_put(np);
            }
      }

      if (ppc_override_l2cr)
            printk(KERN_INFO "L2CR overridden (0x%x), "
                   "backside cache is %s\n",
                   ppc_override_l2cr_value,
                   (ppc_override_l2cr_value & 0x80000000)
                        ? "enabled" : "disabled");
}
#endif

static void __init pmac_setup_arch(void)
{
      struct device_node *cpu, *ic;
      const int *fp;
      unsigned long pvr;

      pvr = PVR_VER(mfspr(SPRN_PVR));

      /* Set loops_per_jiffy to a half-way reasonable value,
         for use until calibrate_delay gets called. */
      loops_per_jiffy = 50000000 / HZ;
      cpu = of_find_node_by_type(NULL, "cpu");
      if (cpu != NULL) {
            fp = of_get_property(cpu, "clock-frequency", NULL);
            if (fp != NULL) {
                  if (pvr >= 0x30 && pvr < 0x80)
                        /* PPC970 etc. */
                        loops_per_jiffy = *fp / (3 * HZ);
                  else if (pvr == 4 || pvr >= 8)
                        /* 604, G3, G4 etc. */
                        loops_per_jiffy = *fp / HZ;
                  else
                        /* 601, 603, etc. */
                        loops_per_jiffy = *fp / (2 * HZ);
            }
            of_node_put(cpu);
      }

      /* See if newworld or oldworld */
      for (ic = NULL; (ic = of_find_all_nodes(ic)) != NULL; )
            if (of_get_property(ic, "interrupt-controller", NULL))
                  break;
      if (ic) {
            pmac_newworld = 1;
            of_node_put(ic);
      }

      /* Lookup PCI hosts */
      pmac_pci_init();

#ifdef CONFIG_PPC32
      ohare_init();
      l2cr_init();
#endif /* CONFIG_PPC32 */

      find_via_cuda();
      find_via_pmu();
      smu_init();

#if defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) || \
    defined(CONFIG_PPC64)
      pmac_nvram_init();
#endif

#ifdef CONFIG_PPC32
#ifdef CONFIG_BLK_DEV_INITRD
      if (initrd_start)
            ROOT_DEV = Root_RAM0;
      else
#endif
            ROOT_DEV = DEFAULT_ROOT_DEVICE;
#endif

#ifdef CONFIG_SMP
      /* Check for Core99 */
      ic = of_find_node_by_name(NULL, "uni-n");
      if (!ic)
            ic = of_find_node_by_name(NULL, "u3");
      if (!ic)
            ic = of_find_node_by_name(NULL, "u4");
      if (ic) {
            of_node_put(ic);
            smp_ops = &core99_smp_ops;
      }
#ifdef CONFIG_PPC32
      else {
            /*
             * We have to set bits in cpu_possible_map here since the
             * secondary CPU(s) aren't in the device tree, and
             * setup_per_cpu_areas only allocates per-cpu data for
             * CPUs in the cpu_possible_map.
             */
            int cpu;

            for (cpu = 1; cpu < 4 && cpu < NR_CPUS; ++cpu)
                  cpu_set(cpu, cpu_possible_map);
            smp_ops = &psurge_smp_ops;
      }
#endif
#endif /* CONFIG_SMP */

#ifdef CONFIG_ADB
      if (strstr(cmd_line, "adb_sync")) {
            extern int __adb_probe_sync;
            __adb_probe_sync = 1;
      }
#endif /* CONFIG_ADB */
}

#ifdef CONFIG_SCSI
void note_scsi_host(struct device_node *node, void *host)
{
}
EXPORT_SYMBOL(note_scsi_host);
#endif

static int initializing = 1;

static int pmac_late_init(void)
{
      initializing = 0;
      /* this is udbg (which is __init) and we can later use it during
       * cpu hotplug (in smp_core99_kick_cpu) */
      ppc_md.progress = NULL;
      return 0;
}
machine_late_initcall(powermac, pmac_late_init);

/*
 * This is __init_refok because we check for "initializing" before
 * touching any of the __init sensitive things and "initializing"
 * will be false after __init time. This can't be __init because it
 * can be called whenever a disk is first accessed.
 */
void __init_refok note_bootable_part(dev_t dev, int part, int goodness)
{
      char *p;

      if (!initializing)
            return;
      if ((goodness <= current_root_goodness) &&
          ROOT_DEV != DEFAULT_ROOT_DEVICE)
            return;
      p = strstr(boot_command_line, "root=");
      if (p != NULL && (p == boot_command_line || p[-1] == ' '))
            return;

      ROOT_DEV = dev + part;
      current_root_goodness = goodness;
}

#ifdef CONFIG_ADB_CUDA
static void cuda_restart(void)
{
      struct adb_request req;

      cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
      for (;;)
            cuda_poll();
}

static void cuda_shutdown(void)
{
      struct adb_request req;

      cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
      for (;;)
            cuda_poll();
}

#else
#define cuda_restart()
#define cuda_shutdown()
#endif

#ifndef CONFIG_ADB_PMU
#define pmu_restart()
#define pmu_shutdown()
#endif

#ifndef CONFIG_PMAC_SMU
#define smu_restart()
#define smu_shutdown()
#endif

static void pmac_restart(char *cmd)
{
      switch (sys_ctrler) {
      case SYS_CTRLER_CUDA:
            cuda_restart();
            break;
      case SYS_CTRLER_PMU:
            pmu_restart();
            break;
      case SYS_CTRLER_SMU:
            smu_restart();
            break;
      default: ;
      }
}

static void pmac_power_off(void)
{
      switch (sys_ctrler) {
      case SYS_CTRLER_CUDA:
            cuda_shutdown();
            break;
      case SYS_CTRLER_PMU:
            pmu_shutdown();
            break;
      case SYS_CTRLER_SMU:
            smu_shutdown();
            break;
      default: ;
      }
}

static void
pmac_halt(void)
{
      pmac_power_off();
}

/* 
 * Early initialization.
 */
static void __init pmac_init_early(void)
{
      /* Enable early btext debug if requested */
      if (strstr(cmd_line, "btextdbg")) {
            udbg_adb_init_early();
            register_early_udbg_console();
      }

      /* Probe motherboard chipset */
      pmac_feature_init();

      /* Initialize debug stuff */
      udbg_scc_init(!!strstr(cmd_line, "sccdbg"));
      udbg_adb_init(!!strstr(cmd_line, "btextdbg"));

#ifdef CONFIG_PPC64
      iommu_init_early_dart();
#endif
}

static int __init pmac_declare_of_platform_devices(void)
{
      struct device_node *np;

      if (machine_is(chrp))
            return -1;

      np = of_find_node_by_name(NULL, "valkyrie");
      if (np)
            of_platform_device_create(np, "valkyrie", NULL);
      np = of_find_node_by_name(NULL, "platinum");
      if (np)
            of_platform_device_create(np, "platinum", NULL);
        np = of_find_node_by_type(NULL, "smu");
        if (np) {
            of_platform_device_create(np, "smu", NULL);
            of_node_put(np);
      }

      return 0;
}
machine_device_initcall(powermac, pmac_declare_of_platform_devices);

#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
/*
 * This is called very early, as part of console_init() (typically just after
 * time_init()). This function is respondible for trying to find a good
 * default console on serial ports. It tries to match the open firmware
 * default output with one of the available serial console drivers.
 */
static int __init check_pmac_serial_console(void)
{
      struct device_node *prom_stdout = NULL;
      int offset = 0;
      const char *name;
#ifdef CONFIG_SERIAL_PMACZILOG_TTYS
      char *devname = "ttyS";
#else
      char *devname = "ttyPZ";
#endif

      pr_debug(" -> check_pmac_serial_console()\n");

      /* The user has requested a console so this is already set up. */
      if (strstr(boot_command_line, "console=")) {
            pr_debug(" console was specified !\n");
            return -EBUSY;
      }

      if (!of_chosen) {
            pr_debug(" of_chosen is NULL !\n");
            return -ENODEV;
      }

      /* We are getting a weird phandle from OF ... */
      /* ... So use the full path instead */
      name = of_get_property(of_chosen, "linux,stdout-path", NULL);
      if (name == NULL) {
            pr_debug(" no linux,stdout-path !\n");
            return -ENODEV;
      }
      prom_stdout = of_find_node_by_path(name);
      if (!prom_stdout) {
            pr_debug(" can't find stdout package %s !\n", name);
            return -ENODEV;
      }
      pr_debug("stdout is %s\n", prom_stdout->full_name);

      name = of_get_property(prom_stdout, "name", NULL);
      if (!name) {
            pr_debug(" stdout package has no name !\n");
            goto not_found;
      }

      if (strcmp(name, "ch-a") == 0)
            offset = 0;
      else if (strcmp(name, "ch-b") == 0)
            offset = 1;
      else
            goto not_found;
      of_node_put(prom_stdout);

      pr_debug("Found serial console at %s%d\n", devname, offset);

      return add_preferred_console(devname, offset, NULL);

 not_found:
      pr_debug("No preferred console found !\n");
      of_node_put(prom_stdout);
      return -ENODEV;
}
console_initcall(check_pmac_serial_console);

#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */

/*
 * Called very early, MMU is off, device-tree isn't unflattened
 */
static int __init pmac_probe(void)
{
      unsigned long root = of_get_flat_dt_root();

      if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
          !of_flat_dt_is_compatible(root, "MacRISC"))
            return 0;

#ifdef CONFIG_PPC64
      /*
       * On U3, the DART (iommu) must be allocated now since it
       * has an impact on htab_initialize (due to the large page it
       * occupies having to be broken up so the DART itself is not
       * part of the cacheable linar mapping
       */
      alloc_dart_table();

      hpte_init_native();
#endif

#ifdef CONFIG_PPC32
      /* isa_io_base gets set in pmac_pci_init */
      ISA_DMA_THRESHOLD = ~0L;
      DMA_MODE_READ = 1;
      DMA_MODE_WRITE = 2;
#endif /* CONFIG_PPC32 */

#ifdef CONFIG_PMAC_SMU
      /*
       * SMU based G5s need some memory below 2Gb, at least the current
       * driver needs that. We have to allocate it now. We allocate 4k
       * (1 small page) for now.
       */
      smu_cmdbuf_abs = lmb_alloc_base(4096, 4096, 0x80000000UL);
#endif /* CONFIG_PMAC_SMU */

      return 1;
}

#ifdef CONFIG_PPC64
/* Move that to pci.c */
static int pmac_pci_probe_mode(struct pci_bus *bus)
{
      struct device_node *node = bus->sysdata;

      /* We need to use normal PCI probing for the AGP bus,
       * since the device for the AGP bridge isn't in the tree.
       * Same for the PCIe host on U4 and the HT host bridge.
       */
      if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") ||
                          of_device_is_compatible(node, "u4-pcie") ||
                          of_device_is_compatible(node, "u3-ht")))
            return PCI_PROBE_NORMAL;
      return PCI_PROBE_DEVTREE;
}

#ifdef CONFIG_HOTPLUG_CPU
/* access per cpu vars from generic smp.c */
DECLARE_PER_CPU(int, cpu_state);

static void pmac_cpu_die(void)
{
      /*
       * turn off as much as possible, we'll be
       * kicked out as this will only be invoked
       * on core99 platforms for now ...
       */

      printk(KERN_INFO "CPU#%d offline\n", smp_processor_id());
      __get_cpu_var(cpu_state) = CPU_DEAD;
      smp_wmb();

      /*
       * during the path that leads here preemption is disabled,
       * reenable it now so that when coming up preempt count is
       * zero correctly
       */
      preempt_enable();

      /*
       * hard-disable interrupts for the non-NAP case, the NAP code
       * needs to re-enable interrupts (but soft-disables them)
       */
      hard_irq_disable();

      while (1) {
            /* let's not take timer interrupts too often ... */
            set_dec(0x7fffffff);

            /* should always be true at this point */
            if (cpu_has_feature(CPU_FTR_CAN_NAP))
                  power4_cpu_offline_powersave();
            else {
                  HMT_low();
                  HMT_very_low();
            }
      }
}
#endif /* CONFIG_HOTPLUG_CPU */

#endif /* CONFIG_PPC64 */

define_machine(powermac) {
      .name             = "PowerMac",
      .probe                  = pmac_probe,
      .setup_arch       = pmac_setup_arch,
      .init_early       = pmac_init_early,
      .show_cpuinfo           = pmac_show_cpuinfo,
      .init_IRQ         = pmac_pic_init,
      .get_irq          = NULL,     /* changed later */
      .pci_irq_fixup          = pmac_pci_irq_fixup,
      .restart          = pmac_restart,
      .power_off        = pmac_power_off,
      .halt             = pmac_halt,
      .time_init        = pmac_time_init,
      .get_boot_time          = pmac_get_boot_time,
      .set_rtc_time           = pmac_set_rtc_time,
      .get_rtc_time           = pmac_get_rtc_time,
      .calibrate_decr         = pmac_calibrate_decr,
      .feature_call           = pmac_do_feature_call,
      .progress         = udbg_progress,
#ifdef CONFIG_PPC64
      .pci_probe_mode         = pmac_pci_probe_mode,
      .power_save       = power4_idle,
      .enable_pmcs            = power4_enable_pmcs,
#ifdef CONFIG_KEXEC
      .machine_kexec          = default_machine_kexec,
      .machine_kexec_prepare  = default_machine_kexec_prepare,
      .machine_crash_shutdown = default_machine_crash_shutdown,
#endif
#endif /* CONFIG_PPC64 */
#ifdef CONFIG_PPC32
      .pcibios_enable_device_hook = pmac_pci_enable_device_hook,
      .pcibios_after_init     = pmac_pcibios_after_init,
      .phys_mem_access_prot   = pci_phys_mem_access_prot,
#endif
#if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC64)
      .cpu_die          = pmac_cpu_die,
#endif
};

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