[deliverable/linux.git] / arch / powerpc / platforms / pseries / setup.c

/*
 *  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 <asm/firmware.h>

#include "plpar_wrappers.h"
#include "pseries.h"

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

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

 	return 1;
}

static int __init pSeries_probe(void)
{
	unsigned long root = of_get_flat_dt_root();
 	char *dtype = of_get_flat_dt_prop(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);

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

	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,
	.restart		= rtas_restart,
	.power_off		= rtas_power_off,
	.halt			= rtas_halt,
	.panic			= rtas_os_term,
	.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
};
Commit	Line	Data
1da177e4	1	/*
033ef338	2	* 64-bit pSeries and RS/6000 setup code.
1da177e4 LT	3	*
	4	* Copyright (C) 1995 Linus Torvalds
	5	* Adapted from 'alpha' version by Gary Thomas
	6	* Modified by Cort Dougan (cort@cs.nmt.edu)
	7	* Modified by PPC64 Team, IBM Corp
	8	*
	9	* This program is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU General Public License
	11	* as published by the Free Software Foundation; either version
	12	* 2 of the License, or (at your option) any later version.
	13	*/
	14
	15	/*
	16	* bootup setup stuff..
	17	*/
	18
	19	#undef DEBUG
	20
62d60e9f	21	#include <linux/cpu.h>
1da177e4 LT	22	#include <linux/errno.h>
	23	#include <linux/sched.h>
	24	#include <linux/kernel.h>
	25	#include <linux/mm.h>
	26	#include <linux/stddef.h>
	27	#include <linux/unistd.h>
	28	#include <linux/slab.h>
	29	#include <linux/user.h>
	30	#include <linux/a.out.h>
	31	#include <linux/tty.h>
	32	#include <linux/major.h>
	33	#include <linux/interrupt.h>
	34	#include <linux/reboot.h>
	35	#include <linux/init.h>
	36	#include <linux/ioport.h>
	37	#include <linux/console.h>
	38	#include <linux/pci.h>
cebb2b15	39	#include <linux/utsname.h>
1da177e4 LT	40	#include <linux/adb.h>
	41	#include <linux/module.h>
	42	#include <linux/delay.h>
	43	#include <linux/irq.h>
	44	#include <linux/seq_file.h>
	45	#include <linux/root_dev.h>
	46
	47	#include <asm/mmu.h>
	48	#include <asm/processor.h>
	49	#include <asm/io.h>
	50	#include <asm/pgtable.h>
	51	#include <asm/prom.h>
	52	#include <asm/rtas.h>
	53	#include <asm/pci-bridge.h>
	54	#include <asm/iommu.h>
	55	#include <asm/dma.h>
	56	#include <asm/machdep.h>
	57	#include <asm/irq.h>
3d1229d6	58	#include <asm/kexec.h>
1da177e4 LT	59	#include <asm/time.h>
1da177e4 LT	60	#include <asm/nvram.h>
007e8f51	61	#include "xics.h"
180a3362	62	#include <asm/pmc.h>
bbeb3f4c	63	#include <asm/mpic.h>
d387899f	64	#include <asm/ppc-pci.h>
69a80d3f PM	65	#include <asm/i8259.h>
69a80d3f PM	66	#include <asm/udbg.h>
2249ca9d	67	#include <asm/smp.h>
577830b0	68	#include <asm/firmware.h>
1da177e4	69
a1218720	70	#include "plpar_wrappers.h"
577830b0	71	#include "pseries.h"
a1218720	72
1da177e4 LT	73	#ifdef DEBUG
	74	#define DBG(fmt...) udbg_printf(fmt)
	75	#else
	76	#define DBG(fmt...)
	77	#endif
	78
0ebfff14	79	/* move those away to a .h */
1da177e4	80	extern void find_udbg_vterm(void);
1da177e4 LT	81
	82	int fwnmi_active; /* TRUE if an FWNMI handler is present */
	83
fbd7740f PM	84	static void pseries_shared_idle_sleep(void);
fbd7740f PM	85	static void pseries_dedicated_idle_sleep(void);
62d60e9f	86
0ebfff14	87	static struct device_node *pSeries_mpic_node;
1da177e4	88
8446196a	89	static void pSeries_show_cpuinfo(struct seq_file *m)
1da177e4 LT	90	{
	91	struct device_node *root;
	92	const char *model = "";
	93
	94	root = of_find_node_by_path("/");
	95	if (root)
	96	model = get_property(root, "model", NULL);
	97	seq_printf(m, "machine\t\t: CHRP %s\n", model);
	98	of_node_put(root);
	99	}
	100
	101	/* Initialize firmware assisted non-maskable interrupts if
	102	* the firmware supports this feature.
1da177e4 LT	103	*/
	104	static void __init fwnmi_init(void)
	105	{
8c4f1f29 ME	106	unsigned long system_reset_addr, machine_check_addr;
8c4f1f29 ME	107
1da177e4 LT	108	int ibm_nmi_register = rtas_token("ibm,nmi-register");
	109	if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
	110	return;
8c4f1f29 ME	111
	112	/* If the kernel's not linked at zero we point the firmware at low
	113	* addresses anyway, and use a trampoline to get to the real code. */
	114	system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START;
	115	machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
	116
	117	if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
	118	machine_check_addr))
1da177e4 LT	119	fwnmi_active = 1;
	120	}
	121
7d12e780	122	void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
b9e5b4e6	123	{
35a84c2f	124	unsigned int cascade_irq = i8259_irq();
0ebfff14	125	if (cascade_irq != NO_IRQ)
7d12e780	126	generic_handle_irq(cascade_irq);
0ebfff14	127	desc->chip->eoi(irq);
b9e5b4e6 BH	128	}
b9e5b4e6 BH	129
0ebfff14	130	static void __init pseries_mpic_init_IRQ(void)
1da177e4	131	{
0ebfff14	132	struct device_node np, old, *cascade = NULL;
954a46e2	133	const unsigned int *addrp;
f9bd170a	134	unsigned long intack = 0;
954a46e2	135	const unsigned int *opprop;
1da177e4	136	unsigned long openpic_addr = 0;
0ebfff14 BH	137	unsigned int cascade_irq;
	138	int naddr, n, i, opplen;
	139	struct mpic *mpic;
1da177e4	140
0ebfff14 BH	141	np = of_find_node_by_path("/");
0ebfff14 BH	142	naddr = prom_n_addr_cells(np);
954a46e2	143	opprop = get_property(np, "platform-open-pic", &opplen);
1da177e4	144	if (opprop != 0) {
0ebfff14	145	openpic_addr = of_read_number(opprop, naddr);
1da177e4 LT	146	printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
1da177e4 LT	147	}
0ebfff14	148	of_node_put(np);
1da177e4 LT	149
	150	BUG_ON(openpic_addr == 0);
	151
1da177e4	152	/* Setup the openpic driver */
0ebfff14 BH	153	mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
	154	MPIC_PRIMARY,
	155	16, 250, /* isu size, irq count */
	156	" MPIC ");
	157	BUG_ON(mpic == NULL);
	158
	159	/* Add ISUs */
	160	opplen /= sizeof(u32);
	161	for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
	162	unsigned long isuaddr = of_read_number(opprop + i, naddr);
	163	mpic_assign_isu(mpic, n, isuaddr);
	164	}
	165
	166	/* All ISUs are setup, complete initialization */
	167	mpic_init(mpic);
	168
	169	/* Look for cascade */
	170	for_each_node_by_type(np, "interrupt-controller")
	171	if (device_is_compatible(np, "chrp,iic")) {
	172	cascade = np;
	173	break;
	174	}
	175	if (cascade == NULL)
	176	return;
	177
	178	cascade_irq = irq_of_parse_and_map(cascade, 0);
	179	if (cascade == NO_IRQ) {
586da2cc	180	printk(KERN_ERR "mpic: failed to map cascade interrupt");
0ebfff14 BH	181	return;
	182	}
	183
	184	/* Check ACK type */
	185	for (old = of_node_get(cascade); old != NULL ; old = np) {
	186	np = of_get_parent(old);
	187	of_node_put(old);
	188	if (np == NULL)
	189	break;
	190	if (strcmp(np->name, "pci") != 0)
	191	continue;
954a46e2	192	addrp = get_property(np, "8259-interrupt-acknowledge",
0ebfff14 BH	193	NULL);
	194	if (addrp == NULL)
	195	continue;
	196	naddr = prom_n_addr_cells(np);
	197	intack = addrp[naddr-1];
	198	if (naddr > 1)
	199	intack \|= ((unsigned long)addrp[naddr-2]) << 32;
	200	}
	201	if (intack)
	202	printk(KERN_DEBUG "mpic: PCI 8259 intack at 0x%016lx\n",
	203	intack);
	204	i8259_init(cascade, intack);
	205	of_node_put(cascade);
	206	set_irq_chained_handler(cascade_irq, pseries_8259_cascade);
1da177e4 LT	207	}
1da177e4 LT	208
180a3362 ME	209	static void pseries_lpar_enable_pmcs(void)
	210	{
	211	unsigned long set, reset;
	212
180a3362 ME	213	set = 1UL << 63;
	214	reset = 0;
	215	plpar_hcall_norets(H_PERFMON, set, reset);
	216
	217	/* instruct hypervisor to maintain PMCs */
	218	if (firmware_has_feature(FW_FEATURE_SPLPAR))
3356bb9f	219	get_lppaca()->pmcregs_in_use = 1;
180a3362 ME	220	}
180a3362 ME	221
0ebfff14	222	#ifdef CONFIG_KEXEC
f50d4cfc	223	static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
0ebfff14 BH	224	{
	225	/* Don't risk a hypervisor call if we're crashing */
	226	if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
2f6093c8	227	unsigned long addr;
0ebfff14	228
2f6093c8 MN	229	addr = __pa(get_slb_shadow());
	230	if (unregister_slb_shadow(hard_smp_processor_id(), addr))
	231	printk("SLB shadow buffer deregistration of "
	232	"cpu %u (hw_cpu_id %d) failed\n",
	233	smp_processor_id(),
	234	hard_smp_processor_id());
	235
	236	addr = __pa(get_lppaca());
	237	if (unregister_vpa(hard_smp_processor_id(), addr)) {
0ebfff14 BH	238	printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
	239	"failed\n", smp_processor_id(),
	240	hard_smp_processor_id());
	241	}
	242	}
f50d4cfc ME	243	}
	244
	245	static void pseries_kexec_cpu_down_mpic(int crash_shutdown, int secondary)
	246	{
	247	pseries_kexec_cpu_down(crash_shutdown, secondary);
	248	mpic_teardown_this_cpu(secondary);
	249	}
	250
	251	static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
	252	{
	253	pseries_kexec_cpu_down(crash_shutdown, secondary);
0ebfff14 BH	254	xics_teardown_cpu(secondary);
	255	}
	256	#endif /* CONFIG_KEXEC */
	257
	258	static void __init pseries_discover_pic(void)
	259	{
	260	struct device_node *np;
954a46e2	261	const char *typep;
0ebfff14 BH	262
	263	for (np = NULL; (np = of_find_node_by_name(np,
	264	"interrupt-controller"));) {
954a46e2	265	typep = get_property(np, "compatible", NULL);
0ebfff14 BH	266	if (strstr(typep, "open-pic")) {
	267	pSeries_mpic_node = of_node_get(np);
	268	ppc_md.init_IRQ = pseries_mpic_init_IRQ;
	269	ppc_md.get_irq = mpic_get_irq;
	270	#ifdef CONFIG_KEXEC
	271	ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_mpic;
	272	#endif
0ebfff14	273	smp_init_pseries_mpic();
0ebfff14 BH	274	return;
	275	} else if (strstr(typep, "ppc-xicp")) {
	276	ppc_md.init_IRQ = xics_init_IRQ;
	277	#ifdef CONFIG_KEXEC
	278	ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
	279	#endif
0ebfff14	280	smp_init_pseries_xics();
0ebfff14 BH	281	return;
	282	}
	283	}
	284	printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
	285	" interrupt-controller\n");
	286	}
	287
	288	static void __init pSeries_setup_arch(void)
	289	{
	290	/* Discover PIC type and setup ppc_md accordingly */
	291	pseries_discover_pic();
	292
1da177e4 LT	293	/* openpic global configuration register (64-bit format). */
	294	/* openpic Interrupt Source Unit pointer (64-bit format). */
	295	/* python0 facility area (mmio) (64-bit format) REAL address. */
	296
	297	/* init to some ~sane value until calibrate_delay() runs */
	298	loops_per_jiffy = 50000000;
	299
	300	if (ROOT_DEV == 0) {
	301	printk("No ramdisk, default root is /dev/sda2\n");
	302	ROOT_DEV = Root_SDA2;
	303	}
	304
	305	fwnmi_init();
	306
	307	/* Find and initialize PCI host bridges */
	308	init_pci_config_tokens();
1da177e4	309	find_and_init_phbs();
0160f53e	310	eeh_init();
1da177e4	311
1da177e4 LT	312	pSeries_nvram_init();
1da177e4 LT	313
62d60e9f	314	/* Choose an idle loop */
1ababe11	315	if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
8d15a3e5	316	vpa_init(boot_cpuid);
3356bb9f	317	if (get_lppaca()->shared_proc) {
4baaf0cf	318	printk(KERN_DEBUG "Using shared processor idle loop\n");
fbd7740f	319	ppc_md.power_save = pseries_shared_idle_sleep;
62d60e9f	320	} else {
4baaf0cf	321	printk(KERN_DEBUG "Using dedicated idle loop\n");
fbd7740f	322	ppc_md.power_save = pseries_dedicated_idle_sleep;
62d60e9f ME	323	}
62d60e9f ME	324	} else {
4baaf0cf	325	printk(KERN_DEBUG "Using default idle loop\n");
62d60e9f	326	}
180a3362	327
57cfb814	328	if (firmware_has_feature(FW_FEATURE_LPAR))
180a3362 ME	329	ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
	330	else
	331	ppc_md.enable_pmcs = power4_enable_pmcs;
1da177e4 LT	332	}
	333
	334	static int __init pSeries_init_panel(void)
	335	{
	336	/* Manually leave the kernel version on the panel. */
	337	ppc_md.progress("Linux ppc64\n", 0);
96b644bd	338	ppc_md.progress(init_utsname()->version, 0);
1da177e4 LT	339
	340	return 0;
	341	}
	342	arch_initcall(pSeries_init_panel);
	343
cab0af98 ME	344	static int pseries_set_dabr(unsigned long dabr)
cab0af98 ME	345	{
76032de8	346	return plpar_hcall_norets(H_SET_DABR, dabr);
cab0af98 ME	347	}
cab0af98 ME	348
76032de8 ME	349	static int pseries_set_xdabr(unsigned long dabr)
	350	{
	351	/* We want to catch accesses from kernel and userspace */
	352	return plpar_hcall_norets(H_SET_XDABR, dabr,
	353	H_DABRX_KERNEL \| H_DABRX_USER);
	354	}
1da177e4 LT	355
	356	/*
	357	* Early initialization. Relocation is on but do not reference unbolted pages
	358	*/
	359	static void __init pSeries_init_early(void)
	360	{
1da177e4 LT	361	DBG(" -> pSeries_init_early()\n");
	362
	363	fw_feature_init();
1da177e4	364
57cfb814	365	if (firmware_has_feature(FW_FEATURE_LPAR))
1da177e4	366	find_udbg_vterm();
1da177e4	367
76032de8	368	if (firmware_has_feature(FW_FEATURE_DABR))
cab0af98	369	ppc_md.set_dabr = pseries_set_dabr;
76032de8 ME	370	else if (firmware_has_feature(FW_FEATURE_XDABR))
76032de8 ME	371	ppc_md.set_dabr = pseries_set_xdabr;
1da177e4 LT	372
	373	iommu_init_early_pSeries();
	374
1da177e4 LT	375	DBG(" <- pSeries_init_early()\n");
	376	}
	377
	378
1da177e4 LT	379	static int pSeries_check_legacy_ioport(unsigned int baseport)
	380	{
	381	struct device_node *np;
	382
	383	#define I8042_DATA_REG 0x60
	384	#define FDC_BASE 0x3f0
	385
	386
	387	switch(baseport) {
	388	case I8042_DATA_REG:
	389	np = of_find_node_by_type(NULL, "8042");
	390	if (np == NULL)
	391	return -ENODEV;
	392	of_node_put(np);
	393	break;
	394	case FDC_BASE:
	395	np = of_find_node_by_type(NULL, "fdc");
	396	if (np == NULL)
	397	return -ENODEV;
	398	of_node_put(np);
	399	break;
	400	}
	401	return 0;
	402	}
	403
	404	/*
	405	* Called very early, MMU is off, device-tree isn't unflattened
	406	*/
1da177e4	407
e8222502 BH	408	static int __init pSeries_probe_hypertas(unsigned long node,
	409	const char *uname, int depth,
	410	void *data)
1da177e4	411	{
e8222502 BH	412	if (depth != 1 \|\|
	413	(strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
	414	return 0;
	415
	416	if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL) != NULL)
	417	powerpc_firmware_features \|= FW_FEATURE_LPAR;
	418
	419	return 1;
	420	}
	421
	422	static int __init pSeries_probe(void)
	423	{
133dda1e	424	unsigned long root = of_get_flat_dt_root();
5773bbcd AB	425	char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
5773bbcd AB	426
e8222502 BH	427	if (dtype == NULL)
	428	return 0;
	429	if (strcmp(dtype, "chrp"))
1da177e4 LT	430	return 0;
1da177e4 LT	431
133dda1e AB	432	/* Cell blades firmware claims to be chrp while it's not. Until this
	433	* is fixed, we need to avoid those here.
	434	*/
	435	if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") \|\|
	436	of_flat_dt_is_compatible(root, "IBM,CBEA"))
	437	return 0;
	438
e8222502	439	DBG("pSeries detected, looking for LPAR capability...\n");
1da177e4	440
e8222502 BH	441	/* Now try to figure out if we are running on LPAR */
	442	of_scan_flat_dt(pSeries_probe_hypertas, NULL);
	443
a2235354 AB	444	if (firmware_has_feature(FW_FEATURE_LPAR))
	445	hpte_init_lpar();
	446	else
	447	hpte_init_native();
	448
e8222502 BH	449	DBG("Machine is%s LPAR !\n",
e8222502 BH	450	(powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
57cfb814	451
1da177e4 LT	452	return 1;
	453	}
	454
e8222502	455
c66d5dd6 ME	456	DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
c66d5dd6 ME	457
fbd7740f	458	static void pseries_dedicated_idle_sleep(void)
143a1dec	459	{
050a0938	460	unsigned int cpu = smp_processor_id();
c66d5dd6	461	unsigned long start_snooze;
c66d5dd6	462
fbd7740f PM	463	/*
	464	* Indicate to the HV that we are idle. Now would be
	465	* a good time to find other work to dispatch.
	466	*/
	467	get_lppaca()->idle = 1;
050a0938	468
fbd7740f PM	469	/*
	470	* We come in with interrupts disabled, and need_resched()
	471	* has been checked recently. If we should poll for a little
	472	* while, do so.
	473	*/
0ddd3e7d	474	if (__get_cpu_var(smt_snooze_delay)) {
fbd7740f	475	start_snooze = get_tb() +
0ddd3e7d	476	__get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
fbd7740f PM	477	local_irq_enable();
fbd7740f PM	478	set_thread_flag(TIF_POLLING_NRFLAG);
050a0938	479
fbd7740f PM	480	while (get_tb() < start_snooze) {
	481	if (need_resched() \|\| cpu_is_offline(cpu))
	482	goto out;
	483	ppc64_runlatch_off();
	484	HMT_low();
	485	HMT_very_low();
	486	}
	487
	488	HMT_medium();
	489	clear_thread_flag(TIF_POLLING_NRFLAG);
	490	smp_mb();
	491	local_irq_disable();
	492	if (need_resched() \|\| cpu_is_offline(cpu))
	493	goto out;
c66d5dd6	494	}
fbd7740f	495
0ddd3e7d	496	cede_processor();
fbd7740f PM	497
	498	out:
	499	HMT_medium();
	500	get_lppaca()->idle = 0;
c66d5dd6 ME	501	}
c66d5dd6 ME	502
fbd7740f	503	static void pseries_shared_idle_sleep(void)
c66d5dd6	504	{
fbd7740f PM	505	/*
	506	* Indicate to the HV that we are idle. Now would be
	507	* a good time to find other work to dispatch.
	508	*/
	509	get_lppaca()->idle = 1;
050a0938	510
fbd7740f PM	511	/*
	512	* Yield the processor to the hypervisor. We return if
	513	* an external interrupt occurs (which are driven prior
	514	* to returning here) or if a prod occurs from another
	515	* processor. When returning here, external interrupts
	516	* are enabled.
	517	*/
	518	cede_processor();
050a0938	519
fbd7740f	520	get_lppaca()->idle = 0;
c66d5dd6 ME	521	}
c66d5dd6 ME	522
4267292b PM	523	static int pSeries_pci_probe_mode(struct pci_bus *bus)
4267292b PM	524	{
57cfb814	525	if (firmware_has_feature(FW_FEATURE_LPAR))
4267292b PM	526	return PCI_PROBE_DEVTREE;
	527	return PCI_PROBE_NORMAL;
	528	}
	529
e8222502 BH	530	define_machine(pseries) {
e8222502 BH	531	.name = "pSeries",
1da177e4 LT	532	.probe = pSeries_probe,
	533	.setup_arch = pSeries_setup_arch,
	534	.init_early = pSeries_init_early,
0dd194d0	535	.show_cpuinfo = pSeries_show_cpuinfo,
1da177e4 LT	536	.log_error = pSeries_log_error,
1da177e4 LT	537	.pcibios_fixup = pSeries_final_fixup,
4267292b	538	.pci_probe_mode = pSeries_pci_probe_mode,
f4fcbbe9 PM	539	.restart = rtas_restart,
	540	.power_off = rtas_power_off,
	541	.halt = rtas_halt,
1da177e4	542	.panic = rtas_os_term,
773bf9c4 AB	543	.get_boot_time = rtas_get_boot_time,
	544	.get_rtc_time = rtas_get_rtc_time,
	545	.set_rtc_time = rtas_set_rtc_time,
10f7e7c1	546	.calibrate_decr = generic_calibrate_decr,
6566c6f1	547	.progress = rtas_progress,
1da177e4 LT	548	.check_legacy_ioport = pSeries_check_legacy_ioport,
	549	.system_reset_exception = pSeries_system_reset_exception,
	550	.machine_check_exception = pSeries_machine_check_exception,
c5e24354	551	#ifdef CONFIG_KEXEC
3d1229d6 ME	552	.machine_kexec = default_machine_kexec,
3d1229d6 ME	553	.machine_kexec_prepare = default_machine_kexec_prepare,
cc532915	554	.machine_crash_shutdown = default_machine_crash_shutdown,
c5e24354	555	#endif
1da177e4	556	};