arch/powerpc/platforms/pseries/setup.c - kernel/msm-4.9 - Gitiles

 /*
  *  64-bit pSeries and RS/6000 setup code.
  *
  *  Copyright (C) 1995  Linus Torvalds
  *  Adapted from 'alpha' version by Gary Thomas
  *  Modified by Cort Dougan (cort@cs.nmt.edu)
  *  Modified by PPC64 Team, IBM Corp
  *
  * 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..
  */

 #undef DEBUG

 #include <linux/cpu.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/slab.h>
 #include <linux/user.h>
 #include <linux/a.out.h>
 #include <linux/tty.h>
 #include <linux/major.h>
 #include <linux/interrupt.h>
 #include <linux/reboot.h>
 #include <linux/init.h>
 #include <linux/ioport.h>
 #include <linux/console.h>
 #include <linux/pci.h>
 #include <linux/utsname.h>
 #include <linux/adb.h>
 #include <linux/module.h>
 #include <linux/delay.h>
 #include <linux/irq.h>
 #include <linux/seq_file.h>
 #include <linux/root_dev.h>

 #include <asm/mmu.h>
 #include <asm/processor.h>
 #include <asm/io.h>
 #include <asm/pgtable.h>
 #include <asm/prom.h>
 #include <asm/rtas.h>
 #include <asm/pci-bridge.h>
 #include <asm/iommu.h>
 #include <asm/dma.h>
 #include <asm/machdep.h>
 #include <asm/irq.h>
 #include <asm/kexec.h>
 #include <asm/time.h>
 #include <asm/nvram.h>
 #include "xics.h"
 #include <asm/pmc.h>
 #include <asm/mpic.h>
 #include <asm/ppc-pci.h>
 #include <asm/i8259.h>
 #include <asm/udbg.h>
 #include <asm/smp.h>

 #include "plpar_wrappers.h"
 #include "ras.h"
 #include "firmware.h"

 #ifdef DEBUG
 #define DBG(fmt...) udbg_printf(fmt)
 #else
 #define DBG(fmt...)
 #endif

 /* move those away to a .h */
 extern void smp_init_pseries_mpic(void);
 extern void smp_init_pseries_xics(void);
 extern void find_udbg_vterm(void);

 int fwnmi_active;  /* TRUE if an FWNMI handler is present */

 static void pseries_shared_idle_sleep(void);
 static void pseries_dedicated_idle_sleep(void);

 static struct device_node *pSeries_mpic_node;

 static void pSeries_show_cpuinfo(struct seq_file *m)
 {
 	struct device_node *root;
 	const char *model = "";

 	root = of_find_node_by_path("/");
 	if (root)
 		model = get_property(root, "model", NULL);
 	seq_printf(m, "machine\t\t: CHRP %s\n", model);
 	of_node_put(root);
 }

 /* Initialize firmware assisted non-maskable interrupts if
  * the firmware supports this feature.
  */
 static void __init fwnmi_init(void)
 {
 	unsigned long system_reset_addr, machine_check_addr;

 	int ibm_nmi_register = rtas_token("ibm,nmi-register");
 	if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
 		return;

 	/* If the kernel's not linked at zero we point the firmware at low
 	 * addresses anyway, and use a trampoline to get to the real code. */
 	system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
 	machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;

 	if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
 				machine_check_addr))
 		fwnmi_active = 1;
 }

 void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
 {
 	unsigned int cascade_irq = i8259_irq();
 	if (cascade_irq != NO_IRQ)
 		generic_handle_irq(cascade_irq);
 	desc->chip->eoi(irq);
 }

 static void __init pseries_mpic_init_IRQ(void)
 {
 	struct device_node *np, *old, *cascade = NULL;
         const unsigned int *addrp;
 	unsigned long intack = 0;
 	const unsigned int *opprop;
 	unsigned long openpic_addr = 0;
 	unsigned int cascade_irq;
 	int naddr, n, i, opplen;
 	struct mpic *mpic;

 	np = of_find_node_by_path("/");
 	naddr = prom_n_addr_cells(np);
 	opprop = get_property(np, "platform-open-pic", &opplen);
 	if (opprop != 0) {
 		openpic_addr = of_read_number(opprop, naddr);
 		printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
 	}
 	of_node_put(np);

 	BUG_ON(openpic_addr == 0);

 	/* Setup the openpic driver */
 	mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
 			  MPIC_PRIMARY,
 			  16, 250, /* isu size, irq count */
 			  " MPIC     ");
 	BUG_ON(mpic == NULL);

 	/* Add ISUs */
 	opplen /= sizeof(u32);
 	for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
 		unsigned long isuaddr = of_read_number(opprop + i, naddr);
 		mpic_assign_isu(mpic, n, isuaddr);
 	}

 	/* All ISUs are setup, complete initialization */
 	mpic_init(mpic);

 	/* Look for cascade */
 	for_each_node_by_type(np, "interrupt-controller")
 		if (device_is_compatible(np, "chrp,iic")) {
 			cascade = np;
 			break;
 		}
 	if (cascade == NULL)
 		return;

 	cascade_irq = irq_of_parse_and_map(cascade, 0);
 	if (cascade == NO_IRQ) {
 		printk(KERN_ERR "mpic: failed to map cascade interrupt");
 		return;
 	}

 	/* Check ACK type */
 	for (old = of_node_get(cascade); old != NULL ; old = np) {
 		np = of_get_parent(old);
 		of_node_put(old);
 		if (np == NULL)
 			break;
 		if (strcmp(np->name, "pci") != 0)
 			continue;
 		addrp = get_property(np, "8259-interrupt-acknowledge",
 					    NULL);
 		if (addrp == NULL)
 			continue;
 		naddr = prom_n_addr_cells(np);
 		intack = addrp[naddr-1];
 		if (naddr > 1)
 			intack |= ((unsigned long)addrp[naddr-2]) << 32;
 	}
 	if (intack)
 		printk(KERN_DEBUG "mpic: PCI 8259 intack at 0x%016lx\n",
 		       intack);
 	i8259_init(cascade, intack);
 	of_node_put(cascade);
 	set_irq_chained_handler(cascade_irq, pseries_8259_cascade);
 }

 static void pseries_lpar_enable_pmcs(void)
 {
 	unsigned long set, reset;

 	set = 1UL << 63;
 	reset = 0;
 	plpar_hcall_norets(H_PERFMON, set, reset);

 	/* instruct hypervisor to maintain PMCs */
 	if (firmware_has_feature(FW_FEATURE_SPLPAR))
 		get_lppaca()->pmcregs_in_use = 1;
 }

 #ifdef CONFIG_KEXEC
 static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
 {
 	/* Don't risk a hypervisor call if we're crashing */
 	if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
 		unsigned long addr;

 		addr = __pa(get_slb_shadow());
 		if (unregister_slb_shadow(hard_smp_processor_id(), addr))
 			printk("SLB shadow buffer deregistration of "
 			       "cpu %u (hw_cpu_id %d) failed\n",
 			       smp_processor_id(),
 			       hard_smp_processor_id());

 		addr = __pa(get_lppaca());
 		if (unregister_vpa(hard_smp_processor_id(), addr)) {
 			printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
 					"failed\n", smp_processor_id(),
 					hard_smp_processor_id());
 		}
 	}
 }

 static void pseries_kexec_cpu_down_mpic(int crash_shutdown, int secondary)
 {
 	pseries_kexec_cpu_down(crash_shutdown, secondary);
 	mpic_teardown_this_cpu(secondary);
 }

 static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
 {
 	pseries_kexec_cpu_down(crash_shutdown, secondary);
 	xics_teardown_cpu(secondary);
 }
 #endif /* CONFIG_KEXEC */

 static void __init pseries_discover_pic(void)
 {
 	struct device_node *np;
 	const char *typep;

 	for (np = NULL; (np = of_find_node_by_name(np,
 						   "interrupt-controller"));) {
 		typep = get_property(np, "compatible", NULL);
 		if (strstr(typep, "open-pic")) {
 			pSeries_mpic_node = of_node_get(np);
 			ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
 			ppc_md.get_irq        = mpic_get_irq;
 #ifdef CONFIG_KEXEC
 			ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_mpic;
 #endif
 #ifdef CONFIG_SMP
 			smp_init_pseries_mpic();
 #endif
 			return;
 		} else if (strstr(typep, "ppc-xicp")) {
 			ppc_md.init_IRQ       = xics_init_IRQ;
 #ifdef CONFIG_KEXEC
 			ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
 #endif
 #ifdef CONFIG_SMP
 			smp_init_pseries_xics();
 #endif
 			return;
 		}
 	}
 	printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
 	       " interrupt-controller\n");
 }

 static void __init pSeries_setup_arch(void)
 {
 	/* Discover PIC type and setup ppc_md accordingly */
 	pseries_discover_pic();

 	/* openpic global configuration register (64-bit format). */
 	/* openpic Interrupt Source Unit pointer (64-bit format). */
 	/* python0 facility area (mmio) (64-bit format) REAL address. */

 	/* init to some ~sane value until calibrate_delay() runs */
 	loops_per_jiffy = 50000000;

 	if (ROOT_DEV == 0) {
 		printk("No ramdisk, default root is /dev/sda2\n");
 		ROOT_DEV = Root_SDA2;
 	}

 	fwnmi_init();

 	/* Find and initialize PCI host bridges */
 	init_pci_config_tokens();
 	find_and_init_phbs();
 	eeh_init();

 	pSeries_nvram_init();

 	/* Choose an idle loop */
 	if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
 		vpa_init(boot_cpuid);
 		if (get_lppaca()->shared_proc) {
 			printk(KERN_DEBUG "Using shared processor idle loop\n");
 			ppc_md.power_save = pseries_shared_idle_sleep;
 		} else {
 			printk(KERN_DEBUG "Using dedicated idle loop\n");
 			ppc_md.power_save = pseries_dedicated_idle_sleep;
 		}
 	} else {
 		printk(KERN_DEBUG "Using default idle loop\n");
 	}

 	if (firmware_has_feature(FW_FEATURE_LPAR))
 		ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 	else
 		ppc_md.enable_pmcs = power4_enable_pmcs;
 }

 static int __init pSeries_init_panel(void)
 {
 	/* Manually leave the kernel version on the panel. */
 	ppc_md.progress("Linux ppc64\n", 0);
 	ppc_md.progress(init_utsname()->version, 0);

 	return 0;
 }
 arch_initcall(pSeries_init_panel);

 static void pSeries_mach_cpu_die(void)
 {
 	local_irq_disable();
 	idle_task_exit();
 	xics_teardown_cpu(0);
 	rtas_stop_self();
 	/* Should never get here... */
 	BUG();
 	for(;;);
 }

 static int pseries_set_dabr(unsigned long dabr)
 {
 	return plpar_hcall_norets(H_SET_DABR, dabr);
 }

 static int pseries_set_xdabr(unsigned long dabr)
 {
 	/* We want to catch accesses from kernel and userspace */
 	return plpar_hcall_norets(H_SET_XDABR, dabr,
 			H_DABRX_KERNEL | H_DABRX_USER);
 }

 /*
  * Early initialization.  Relocation is on but do not reference unbolted pages
  */
 static void __init pSeries_init_early(void)
 {
 	DBG(" -> pSeries_init_early()\n");

 	fw_feature_init();

 	if (firmware_has_feature(FW_FEATURE_LPAR))
 		find_udbg_vterm();

 	if (firmware_has_feature(FW_FEATURE_DABR))
 		ppc_md.set_dabr = pseries_set_dabr;
 	else if (firmware_has_feature(FW_FEATURE_XDABR))
 		ppc_md.set_dabr = pseries_set_xdabr;

 	iommu_init_early_pSeries();

 	DBG(" <- pSeries_init_early()\n");
 }


 static int pSeries_check_legacy_ioport(unsigned int baseport)
 {
 	struct device_node *np;

 #define I8042_DATA_REG	0x60
 #define FDC_BASE	0x3f0


 	switch(baseport) {
 	case I8042_DATA_REG:
 		np = of_find_node_by_type(NULL, "8042");
 		if (np == NULL)
 			return -ENODEV;
 		of_node_put(np);
 		break;
 	case FDC_BASE:
 		np = of_find_node_by_type(NULL, "fdc");
 		if (np == NULL)
 			return -ENODEV;
 		of_node_put(np);
 		break;
 	}
 	return 0;
 }

 /*
  * Called very early, MMU is off, device-tree isn't unflattened
  */

 static int __init pSeries_probe_hypertas(unsigned long node,
 					 const char *uname, int depth,
 					 void *data)
 {
 	if (depth != 1 ||
 	    (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
  		return 0;

 	if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL) != NULL)
  		powerpc_firmware_features |= FW_FEATURE_LPAR;

 	if (firmware_has_feature(FW_FEATURE_LPAR))
 		hpte_init_lpar();
 	else
 		hpte_init_native();

  	return 1;
 }

 static int __init pSeries_probe(void)
 {
 	unsigned long root = of_get_flat_dt_root();
  	char *dtype = of_get_flat_dt_prop(of_get_flat_dt_root(),
  					  "device_type", NULL);
  	if (dtype == NULL)
  		return 0;
  	if (strcmp(dtype, "chrp"))
 		return 0;

 	/* Cell blades firmware claims to be chrp while it's not. Until this
 	 * is fixed, we need to avoid those here.
 	 */
 	if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
 	    of_flat_dt_is_compatible(root, "IBM,CBEA"))
 		return 0;

 	DBG("pSeries detected, looking for LPAR capability...\n");

 	/* Now try to figure out if we are running on LPAR */
 	of_scan_flat_dt(pSeries_probe_hypertas, NULL);

 	DBG("Machine is%s LPAR !\n",
 	    (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");

 	return 1;
 }


 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);

 static void pseries_dedicated_idle_sleep(void)
 {
 	unsigned int cpu = smp_processor_id();
 	unsigned long start_snooze;

 	/*
 	 * Indicate to the HV that we are idle. Now would be
 	 * a good time to find other work to dispatch.
 	 */
 	get_lppaca()->idle = 1;

 	/*
 	 * We come in with interrupts disabled, and need_resched()
 	 * has been checked recently.  If we should poll for a little
 	 * while, do so.
 	 */
 	if (__get_cpu_var(smt_snooze_delay)) {
 		start_snooze = get_tb() +
 			__get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
 		local_irq_enable();
 		set_thread_flag(TIF_POLLING_NRFLAG);

 		while (get_tb() < start_snooze) {
 			if (need_resched() || cpu_is_offline(cpu))
 				goto out;
 			ppc64_runlatch_off();
 			HMT_low();
 			HMT_very_low();
 		}

 		HMT_medium();
 		clear_thread_flag(TIF_POLLING_NRFLAG);
 		smp_mb();
 		local_irq_disable();
 		if (need_resched() || cpu_is_offline(cpu))
 			goto out;
 	}

 	cede_processor();

 out:
 	HMT_medium();
 	get_lppaca()->idle = 0;
 }

 static void pseries_shared_idle_sleep(void)
 {
 	/*
 	 * Indicate to the HV that we are idle. Now would be
 	 * a good time to find other work to dispatch.
 	 */
 	get_lppaca()->idle = 1;

 	/*
 	 * Yield the processor to the hypervisor.  We return if
 	 * an external interrupt occurs (which are driven prior
 	 * to returning here) or if a prod occurs from another
 	 * processor. When returning here, external interrupts
 	 * are enabled.
 	 */
 	cede_processor();

 	get_lppaca()->idle = 0;
 }

 static int pSeries_pci_probe_mode(struct pci_bus *bus)
 {
 	if (firmware_has_feature(FW_FEATURE_LPAR))
 		return PCI_PROBE_DEVTREE;
 	return PCI_PROBE_NORMAL;
 }

 define_machine(pseries) {
 	.name			= "pSeries",
 	.probe			= pSeries_probe,
 	.setup_arch		= pSeries_setup_arch,
 	.init_early		= pSeries_init_early,
 	.show_cpuinfo		= pSeries_show_cpuinfo,
 	.log_error		= pSeries_log_error,
 	.pcibios_fixup		= pSeries_final_fixup,
 	.pci_probe_mode		= pSeries_pci_probe_mode,
 	.irq_bus_setup		= pSeries_irq_bus_setup,
 	.restart		= rtas_restart,
 	.power_off		= rtas_power_off,
 	.halt			= rtas_halt,
 	.panic			= rtas_os_term,
 	.cpu_die		= pSeries_mach_cpu_die,
 	.get_boot_time		= rtas_get_boot_time,
 	.get_rtc_time		= rtas_get_rtc_time,
 	.set_rtc_time		= rtas_set_rtc_time,
 	.calibrate_decr		= generic_calibrate_decr,
 	.progress		= rtas_progress,
 	.check_legacy_ioport	= pSeries_check_legacy_ioport,
 	.system_reset_exception = pSeries_system_reset_exception,
 	.machine_check_exception = pSeries_machine_check_exception,
 #ifdef CONFIG_KEXEC
 	.machine_kexec		= default_machine_kexec,
 	.machine_kexec_prepare	= default_machine_kexec_prepare,
 	.machine_crash_shutdown	= default_machine_crash_shutdown,
 #endif
 };
	/*
	* 64-bit pSeries and RS/6000 setup code.
	*
	* Copyright (C) 1995 Linus Torvalds
	* Adapted from 'alpha' version by Gary Thomas
	* Modified by Cort Dougan (cort@cs.nmt.edu)
	* Modified by PPC64 Team, IBM Corp
	*
	* 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..
	*/

	#undef DEBUG

	#include <linux/cpu.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/slab.h>
	#include <linux/user.h>
	#include <linux/a.out.h>
	#include <linux/tty.h>
	#include <linux/major.h>
	#include <linux/interrupt.h>
	#include <linux/reboot.h>
	#include <linux/init.h>
	#include <linux/ioport.h>
	#include <linux/console.h>
	#include <linux/pci.h>
	#include <linux/utsname.h>
	#include <linux/adb.h>
	#include <linux/module.h>
	#include <linux/delay.h>
	#include <linux/irq.h>
	#include <linux/seq_file.h>
	#include <linux/root_dev.h>

	#include <asm/mmu.h>
	#include <asm/processor.h>
	#include <asm/io.h>
	#include <asm/pgtable.h>
	#include <asm/prom.h>
	#include <asm/rtas.h>
	#include <asm/pci-bridge.h>
	#include <asm/iommu.h>
	#include <asm/dma.h>
	#include <asm/machdep.h>
	#include <asm/irq.h>
	#include <asm/kexec.h>
	#include <asm/time.h>
	#include <asm/nvram.h>
	#include "xics.h"
	#include <asm/pmc.h>
	#include <asm/mpic.h>
	#include <asm/ppc-pci.h>
	#include <asm/i8259.h>
	#include <asm/udbg.h>
	#include <asm/smp.h>

	#include "plpar_wrappers.h"
	#include "ras.h"
	#include "firmware.h"

	#ifdef DEBUG
	#define DBG(fmt...) udbg_printf(fmt)
	#else
	#define DBG(fmt...)
	#endif

	/* move those away to a .h */
	extern void smp_init_pseries_mpic(void);
	extern void smp_init_pseries_xics(void);
	extern void find_udbg_vterm(void);

	int fwnmi_active; /* TRUE if an FWNMI handler is present */

	static void pseries_shared_idle_sleep(void);
	static void pseries_dedicated_idle_sleep(void);

	static struct device_node *pSeries_mpic_node;

	static void pSeries_show_cpuinfo(struct seq_file *m)
	{
	struct device_node *root;
	const char *model = "";

	root = of_find_node_by_path("/");
	if (root)
	model = get_property(root, "model", NULL);
	seq_printf(m, "machine\t\t: CHRP %s\n", model);
	of_node_put(root);
	}

	/* Initialize firmware assisted non-maskable interrupts if
	* the firmware supports this feature.
	*/
	static void __init fwnmi_init(void)
	{
	unsigned long system_reset_addr, machine_check_addr;

	int ibm_nmi_register = rtas_token("ibm,nmi-register");
	if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
	return;

	/* If the kernel's not linked at zero we point the firmware at low
	* addresses anyway, and use a trampoline to get to the real code. */
	system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START;
	machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;

	if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
	machine_check_addr))
	fwnmi_active = 1;
	}

	void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
	{
	unsigned int cascade_irq = i8259_irq();
	if (cascade_irq != NO_IRQ)
	generic_handle_irq(cascade_irq);
	desc->chip->eoi(irq);
	}

	static void __init pseries_mpic_init_IRQ(void)
	{
	struct device_node np, old, *cascade = NULL;
	const unsigned int *addrp;
	unsigned long intack = 0;
	const unsigned int *opprop;
	unsigned long openpic_addr = 0;
	unsigned int cascade_irq;
	int naddr, n, i, opplen;
	struct mpic *mpic;

	np = of_find_node_by_path("/");
	naddr = prom_n_addr_cells(np);
	opprop = get_property(np, "platform-open-pic", &opplen);
	if (opprop != 0) {
	openpic_addr = of_read_number(opprop, naddr);
	printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
	}
	of_node_put(np);

	BUG_ON(openpic_addr == 0);

	/* Setup the openpic driver */
	mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
	MPIC_PRIMARY,
	16, 250, /* isu size, irq count */
	" MPIC ");
	BUG_ON(mpic == NULL);

	/* Add ISUs */
	opplen /= sizeof(u32);
	for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
	unsigned long isuaddr = of_read_number(opprop + i, naddr);
	mpic_assign_isu(mpic, n, isuaddr);
	}

	/* All ISUs are setup, complete initialization */
	mpic_init(mpic);

	/* Look for cascade */
	for_each_node_by_type(np, "interrupt-controller")
	if (device_is_compatible(np, "chrp,iic")) {
	cascade = np;
	break;
	}
	if (cascade == NULL)
	return;

	cascade_irq = irq_of_parse_and_map(cascade, 0);
	if (cascade == NO_IRQ) {
	printk(KERN_ERR "mpic: failed to map cascade interrupt");
	return;
	}

	/* Check ACK type */
	for (old = of_node_get(cascade); old != NULL ; old = np) {
	np = of_get_parent(old);
	of_node_put(old);
	if (np == NULL)
	break;
	if (strcmp(np->name, "pci") != 0)
	continue;
	addrp = get_property(np, "8259-interrupt-acknowledge",
	NULL);
	if (addrp == NULL)
	continue;
	naddr = prom_n_addr_cells(np);
	intack = addrp[naddr-1];
	if (naddr > 1)
	intack \|= ((unsigned long)addrp[naddr-2]) << 32;
	}
	if (intack)
	printk(KERN_DEBUG "mpic: PCI 8259 intack at 0x%016lx\n",
	intack);
	i8259_init(cascade, intack);
	of_node_put(cascade);
	set_irq_chained_handler(cascade_irq, pseries_8259_cascade);
	}

	static void pseries_lpar_enable_pmcs(void)
	{
	unsigned long set, reset;

	set = 1UL << 63;
	reset = 0;
	plpar_hcall_norets(H_PERFMON, set, reset);

	/* instruct hypervisor to maintain PMCs */
	if (firmware_has_feature(FW_FEATURE_SPLPAR))
	get_lppaca()->pmcregs_in_use = 1;
	}

	#ifdef CONFIG_KEXEC
	static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
	{
	/* Don't risk a hypervisor call if we're crashing */
	if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
	unsigned long addr;

	addr = __pa(get_slb_shadow());
	if (unregister_slb_shadow(hard_smp_processor_id(), addr))
	printk("SLB shadow buffer deregistration of "
	"cpu %u (hw_cpu_id %d) failed\n",
	smp_processor_id(),
	hard_smp_processor_id());

	addr = __pa(get_lppaca());
	if (unregister_vpa(hard_smp_processor_id(), addr)) {
	printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
	"failed\n", smp_processor_id(),
	hard_smp_processor_id());
	}
	}
	}

	static void pseries_kexec_cpu_down_mpic(int crash_shutdown, int secondary)
	{
	pseries_kexec_cpu_down(crash_shutdown, secondary);
	mpic_teardown_this_cpu(secondary);
	}

	static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
	{
	pseries_kexec_cpu_down(crash_shutdown, secondary);
	xics_teardown_cpu(secondary);
	}
	#endif /* CONFIG_KEXEC */

	static void __init pseries_discover_pic(void)
	{
	struct device_node *np;
	const char *typep;

	for (np = NULL; (np = of_find_node_by_name(np,
	"interrupt-controller"));) {
	typep = get_property(np, "compatible", NULL);
	if (strstr(typep, "open-pic")) {
	pSeries_mpic_node = of_node_get(np);
	ppc_md.init_IRQ = pseries_mpic_init_IRQ;
	ppc_md.get_irq = mpic_get_irq;
	#ifdef CONFIG_KEXEC
	ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_mpic;
	#endif
	#ifdef CONFIG_SMP
	smp_init_pseries_mpic();
	#endif
	return;
	} else if (strstr(typep, "ppc-xicp")) {
	ppc_md.init_IRQ = xics_init_IRQ;
	#ifdef CONFIG_KEXEC
	ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
	#endif
	#ifdef CONFIG_SMP
	smp_init_pseries_xics();
	#endif
	return;
	}
	}
	printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
	" interrupt-controller\n");
	}

	static void __init pSeries_setup_arch(void)
	{
	/* Discover PIC type and setup ppc_md accordingly */
	pseries_discover_pic();

	/* openpic global configuration register (64-bit format). */
	/* openpic Interrupt Source Unit pointer (64-bit format). */
	/* python0 facility area (mmio) (64-bit format) REAL address. */

	/* init to some ~sane value until calibrate_delay() runs */
	loops_per_jiffy = 50000000;

	if (ROOT_DEV == 0) {
	printk("No ramdisk, default root is /dev/sda2\n");
	ROOT_DEV = Root_SDA2;
	}

	fwnmi_init();

	/* Find and initialize PCI host bridges */
	init_pci_config_tokens();
	find_and_init_phbs();
	eeh_init();

	pSeries_nvram_init();

	/* Choose an idle loop */
	if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
	vpa_init(boot_cpuid);
	if (get_lppaca()->shared_proc) {
	printk(KERN_DEBUG "Using shared processor idle loop\n");
	ppc_md.power_save = pseries_shared_idle_sleep;
	} else {
	printk(KERN_DEBUG "Using dedicated idle loop\n");
	ppc_md.power_save = pseries_dedicated_idle_sleep;
	}
	} else {
	printk(KERN_DEBUG "Using default idle loop\n");
	}

	if (firmware_has_feature(FW_FEATURE_LPAR))
	ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
	else
	ppc_md.enable_pmcs = power4_enable_pmcs;
	}

	static int __init pSeries_init_panel(void)
	{
	/* Manually leave the kernel version on the panel. */
	ppc_md.progress("Linux ppc64\n", 0);
	ppc_md.progress(init_utsname()->version, 0);

	return 0;
	}
	arch_initcall(pSeries_init_panel);

	static void pSeries_mach_cpu_die(void)
	{
	local_irq_disable();
	idle_task_exit();
	xics_teardown_cpu(0);
	rtas_stop_self();
	/* Should never get here... */
	BUG();
	for(;;);
	}

	static int pseries_set_dabr(unsigned long dabr)
	{
	return plpar_hcall_norets(H_SET_DABR, dabr);
	}

	static int pseries_set_xdabr(unsigned long dabr)
	{
	/* We want to catch accesses from kernel and userspace */
	return plpar_hcall_norets(H_SET_XDABR, dabr,
	H_DABRX_KERNEL \| H_DABRX_USER);
	}

	/*
	* Early initialization. Relocation is on but do not reference unbolted pages
	*/
	static void __init pSeries_init_early(void)
	{
	DBG(" -> pSeries_init_early()\n");

	fw_feature_init();

	if (firmware_has_feature(FW_FEATURE_LPAR))
	find_udbg_vterm();

	if (firmware_has_feature(FW_FEATURE_DABR))
	ppc_md.set_dabr = pseries_set_dabr;
	else if (firmware_has_feature(FW_FEATURE_XDABR))
	ppc_md.set_dabr = pseries_set_xdabr;

	iommu_init_early_pSeries();

	DBG(" <- pSeries_init_early()\n");
	}


	static int pSeries_check_legacy_ioport(unsigned int baseport)
	{
	struct device_node *np;

	#define I8042_DATA_REG 0x60
	#define FDC_BASE 0x3f0


	switch(baseport) {
	case I8042_DATA_REG:
	np = of_find_node_by_type(NULL, "8042");
	if (np == NULL)
	return -ENODEV;
	of_node_put(np);
	break;
	case FDC_BASE:
	np = of_find_node_by_type(NULL, "fdc");
	if (np == NULL)
	return -ENODEV;
	of_node_put(np);
	break;
	}
	return 0;
	}

	/*
	* Called very early, MMU is off, device-tree isn't unflattened
	*/

	static int __init pSeries_probe_hypertas(unsigned long node,
	const char *uname, int depth,
	void *data)
	{
	if (depth != 1 \|\|
	(strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
	return 0;

	if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL) != NULL)
	powerpc_firmware_features \|= FW_FEATURE_LPAR;

	if (firmware_has_feature(FW_FEATURE_LPAR))
	hpte_init_lpar();
	else
	hpte_init_native();

	return 1;
	}

	static int __init pSeries_probe(void)
	{
	unsigned long root = of_get_flat_dt_root();
	char *dtype = of_get_flat_dt_prop(of_get_flat_dt_root(),
	"device_type", NULL);
	if (dtype == NULL)
	return 0;
	if (strcmp(dtype, "chrp"))
	return 0;

	/* Cell blades firmware claims to be chrp while it's not. Until this
	* is fixed, we need to avoid those here.
	*/
	if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") \|\|
	of_flat_dt_is_compatible(root, "IBM,CBEA"))
	return 0;

	DBG("pSeries detected, looking for LPAR capability...\n");

	/* Now try to figure out if we are running on LPAR */
	of_scan_flat_dt(pSeries_probe_hypertas, NULL);

	DBG("Machine is%s LPAR !\n",
	(powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");

	return 1;
	}


	DECLARE_PER_CPU(unsigned long, smt_snooze_delay);

	static void pseries_dedicated_idle_sleep(void)
	{
	unsigned int cpu = smp_processor_id();
	unsigned long start_snooze;

	/*
	* Indicate to the HV that we are idle. Now would be
	* a good time to find other work to dispatch.
	*/
	get_lppaca()->idle = 1;

	/*
	* We come in with interrupts disabled, and need_resched()
	* has been checked recently. If we should poll for a little
	* while, do so.
	*/
	if (__get_cpu_var(smt_snooze_delay)) {
	start_snooze = get_tb() +
	__get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
	local_irq_enable();
	set_thread_flag(TIF_POLLING_NRFLAG);

	while (get_tb() < start_snooze) {
	if (need_resched() \|\| cpu_is_offline(cpu))
	goto out;
	ppc64_runlatch_off();
	HMT_low();
	HMT_very_low();
	}

	HMT_medium();
	clear_thread_flag(TIF_POLLING_NRFLAG);
	smp_mb();
	local_irq_disable();
	if (need_resched() \|\| cpu_is_offline(cpu))
	goto out;
	}

	cede_processor();

	out:
	HMT_medium();
	get_lppaca()->idle = 0;
	}

	static void pseries_shared_idle_sleep(void)
	{
	/*
	* Indicate to the HV that we are idle. Now would be
	* a good time to find other work to dispatch.
	*/
	get_lppaca()->idle = 1;

	/*
	* Yield the processor to the hypervisor. We return if
	* an external interrupt occurs (which are driven prior
	* to returning here) or if a prod occurs from another
	* processor. When returning here, external interrupts
	* are enabled.
	*/
	cede_processor();

	get_lppaca()->idle = 0;
	}

	static int pSeries_pci_probe_mode(struct pci_bus *bus)
	{
	if (firmware_has_feature(FW_FEATURE_LPAR))
	return PCI_PROBE_DEVTREE;
	return PCI_PROBE_NORMAL;
	}

	define_machine(pseries) {
	.name = "pSeries",
	.probe = pSeries_probe,
	.setup_arch = pSeries_setup_arch,
	.init_early = pSeries_init_early,
	.show_cpuinfo = pSeries_show_cpuinfo,
	.log_error = pSeries_log_error,
	.pcibios_fixup = pSeries_final_fixup,
	.pci_probe_mode = pSeries_pci_probe_mode,
	.irq_bus_setup = pSeries_irq_bus_setup,
	.restart = rtas_restart,
	.power_off = rtas_power_off,
	.halt = rtas_halt,
	.panic = rtas_os_term,
	.cpu_die = pSeries_mach_cpu_die,
	.get_boot_time = rtas_get_boot_time,
	.get_rtc_time = rtas_get_rtc_time,
	.set_rtc_time = rtas_set_rtc_time,
	.calibrate_decr = generic_calibrate_decr,
	.progress = rtas_progress,
	.check_legacy_ioport = pSeries_check_legacy_ioport,
	.system_reset_exception = pSeries_system_reset_exception,
	.machine_check_exception = pSeries_machine_check_exception,
	#ifdef CONFIG_KEXEC
	.machine_kexec = default_machine_kexec,
	.machine_kexec_prepare = default_machine_kexec_prepare,
	.machine_crash_shutdown = default_machine_crash_shutdown,
	#endif
	};