setup.c

linux 内核源代码

	/* 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)
{
	if (!machine_is(powermac))
		return -ENODEV;

	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;
}

late_initcall(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;

	if (!machine_is(powermac))
		return 0;

	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;
}

device_initcall(pmac_declare_of_platform_devices);

/*
 * 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;

#if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
#ifdef CONFIG_BLK_DEV_IDE_PMAC
        ppc_ide_md.ide_init_hwif	= pmac_ide_init_hwif_ports;
        ppc_ide_md.default_io_base	= pmac_ide_get_base;
#endif /* CONFIG_BLK_DEV_IDE_PMAC */
#endif /* defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE) */

#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.
	 */
	if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") ||
				  of_device_is_compatible(node, "u4-pcie")))
		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
};