[mirror_ubuntu-artful-kernel.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..
 */

#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/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 <asm/eeh.h>

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

int CMO_PrPSP = -1;
int CMO_SecPSP = -1;
unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT);

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 = of_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;
}

static 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_setup_i8259_cascade(void)
{
	struct device_node *np, *old, *found = NULL;
	unsigned int cascade;
	const u32 *addrp;
	unsigned long intack = 0;
	int naddr;

	for_each_node_by_type(np, "interrupt-controller") {
		if (of_device_is_compatible(np, "chrp,iic")) {
			found = np;
			break;
		}
	}

	if (found == NULL) {
		printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
		return;
	}

	cascade = irq_of_parse_and_map(found, 0);
	if (cascade == NO_IRQ) {
		printk(KERN_ERR "pic: failed to map cascade interrupt");
		return;
	}
	pr_debug("pic: cascade mapped to irq %d\n", cascade);

	for (old = of_node_get(found); 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 = of_get_property(np, "8259-interrupt-acknowledge", NULL);
		if (addrp == NULL)
			continue;
		naddr = of_n_addr_cells(np);
		intack = addrp[naddr-1];
		if (naddr > 1)
			intack |= ((unsigned long)addrp[naddr-2]) << 32;
	}
	if (intack)
		printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
	i8259_init(found, intack);
	of_node_put(found);
	set_irq_chained_handler(cascade, pseries_8259_cascade);
}

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

	np = of_find_node_by_path("/");
	naddr = of_n_addr_cells(np);
	opprop = of_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 */
	pseries_setup_i8259_cascade();
}

static void __init pseries_xics_init_IRQ(void)
{
	xics_init_IRQ();
	pseries_setup_i8259_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;
}

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 = of_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;
			setup_kexec_cpu_down_mpic();
			smp_init_pseries_mpic();
			return;
		} else if (strstr(typep, "ppc-xicp")) {
			ppc_md.init_IRQ       = pseries_xics_init_IRQ;
			setup_kexec_cpu_down_xics();
			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;

	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);
}

#define CMO_CHARACTERISTICS_TOKEN 44
#define CMO_MAXLENGTH 1026

/**
 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
 * handle that here. (Stolen from parse_system_parameter_string)
 */
void pSeries_cmo_feature_init(void)
{
	char *ptr, *key, *value, *end;
	int call_status;
	int page_order = IOMMU_PAGE_SHIFT;

	pr_debug(" -> fw_cmo_feature_init()\n");
	spin_lock(&rtas_data_buf_lock);
	memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
	call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
				NULL,
				CMO_CHARACTERISTICS_TOKEN,
				__pa(rtas_data_buf),
				RTAS_DATA_BUF_SIZE);

	if (call_status != 0) {
		spin_unlock(&rtas_data_buf_lock);
		pr_debug("CMO not available\n");
		pr_debug(" <- fw_cmo_feature_init()\n");
		return;
	}

	end = rtas_data_buf + CMO_MAXLENGTH - 2;
	ptr = rtas_data_buf + 2;	/* step over strlen value */
	key = value = ptr;

	while (*ptr && (ptr <= end)) {
		/* Separate the key and value by replacing '=' with '\0' and
		 * point the value at the string after the '='
		 */
		if (ptr[0] == '=') {
			ptr[0] = '\0';
			value = ptr + 1;
		} else if (ptr[0] == '\0' || ptr[0] == ',') {
			/* Terminate the string containing the key/value pair */
			ptr[0] = '\0';

			if (key == value) {
				pr_debug("Malformed key/value pair\n");
				/* Never found a '=', end processing */
				break;
			}

			if (0 == strcmp(key, "CMOPageSize"))
				page_order = simple_strtol(value, NULL, 10);
			else if (0 == strcmp(key, "PrPSP"))
				CMO_PrPSP = simple_strtol(value, NULL, 10);
			else if (0 == strcmp(key, "SecPSP"))
				CMO_SecPSP = simple_strtol(value, NULL, 10);
			value = key = ptr + 1;
		}
		ptr++;
	}

	/* Page size is returned as the power of 2 of the page size,
	 * convert to the page size in bytes before returning
	 */
	CMO_PageSize = 1 << page_order;
	pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);

	if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
		pr_info("CMO enabled\n");
		pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
		         CMO_SecPSP);
		powerpc_firmware_features |= FW_FEATURE_CMO;
	} else
		pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
		         CMO_SecPSP);
	spin_unlock(&rtas_data_buf_lock);
	pr_debug(" <- fw_cmo_feature_init()\n");
}

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

	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;

	pSeries_cmo_feature_init();
	iommu_init_early_pSeries();

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

/*
 * 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)
{
	const char *hypertas;
	unsigned long len;

	if (depth != 1 ||
	    (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
		return 0;

	hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
	if (!hypertas)
		return 1;

	powerpc_firmware_features |= FW_FEATURE_LPAR;
	fw_feature_init(hypertas, len);

	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;

	pr_debug("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();

	pr_debug("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;
	unsigned long in_purr, out_purr;

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

	/*
	 * 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();
	out_purr = mfspr(SPRN_PURR);
	get_lppaca()->wait_state_cycles += out_purr - in_purr;
	get_lppaca()->donate_dedicated_cpu = 0;
	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;
}

/**
 * pSeries_power_off - tell firmware about how to power off the system.
 *
 * This function calls either the power-off rtas token in normal cases
 * or the ibm,power-off-ups token (if present & requested) in case of
 * a power failure. If power-off token is used, power on will only be
 * possible with power button press. If ibm,power-off-ups token is used
 * it will allow auto poweron after power is restored.
 */
static void pSeries_power_off(void)
{
	int rc;
	int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");

	if (rtas_flash_term_hook)
		rtas_flash_term_hook(SYS_POWER_OFF);

	if (rtas_poweron_auto == 0 ||
		rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
		rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
		printk(KERN_INFO "RTAS power-off returned %d\n", rc);
	} else {
		rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
		printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
	}
	for (;;);
}

#ifndef CONFIG_PCI
void pSeries_final_fixup(void) { }
#endif

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		= pSeries_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,
	.system_reset_exception = pSeries_system_reset_exception,
	.machine_check_exception = pSeries_machine_check_exception,
};
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
62d60e9f	19	#include <linux/cpu.h>
1da177e4 LT	20	#include <linux/errno.h>
	21	#include <linux/sched.h>
	22	#include <linux/kernel.h>
	23	#include <linux/mm.h>
	24	#include <linux/stddef.h>
	25	#include <linux/unistd.h>
	26	#include <linux/slab.h>
	27	#include <linux/user.h>
	28	#include <linux/a.out.h>
	29	#include <linux/tty.h>
	30	#include <linux/major.h>
	31	#include <linux/interrupt.h>
	32	#include <linux/reboot.h>
	33	#include <linux/init.h>
	34	#include <linux/ioport.h>
	35	#include <linux/console.h>
	36	#include <linux/pci.h>
cebb2b15	37	#include <linux/utsname.h>
1da177e4 LT	38	#include <linux/adb.h>
	39	#include <linux/module.h>
	40	#include <linux/delay.h>
	41	#include <linux/irq.h>
	42	#include <linux/seq_file.h>
	43	#include <linux/root_dev.h>
	44
	45	#include <asm/mmu.h>
	46	#include <asm/processor.h>
	47	#include <asm/io.h>
	48	#include <asm/pgtable.h>
	49	#include <asm/prom.h>
	50	#include <asm/rtas.h>
	51	#include <asm/pci-bridge.h>
	52	#include <asm/iommu.h>
	53	#include <asm/dma.h>
	54	#include <asm/machdep.h>
	55	#include <asm/irq.h>
	56	#include <asm/time.h>
	57	#include <asm/nvram.h>
007e8f51	58	#include "xics.h"
180a3362	59	#include <asm/pmc.h>
bbeb3f4c	60	#include <asm/mpic.h>
d387899f	61	#include <asm/ppc-pci.h>
69a80d3f PM	62	#include <asm/i8259.h>
69a80d3f PM	63	#include <asm/udbg.h>
2249ca9d	64	#include <asm/smp.h>
577830b0	65	#include <asm/firmware.h>
bed59275	66	#include <asm/eeh.h>
1da177e4	67
a1218720	68	#include "plpar_wrappers.h"
577830b0	69	#include "pseries.h"
a1218720	70
81f14997 RJ	71	int CMO_PrPSP = -1;
	72	int CMO_SecPSP = -1;
	73	unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT);
1da177e4	74
1da177e4 LT	75	int fwnmi_active; /* TRUE if an FWNMI handler is present */
1da177e4 LT	76
fbd7740f PM	77	static void pseries_shared_idle_sleep(void);
fbd7740f PM	78	static void pseries_dedicated_idle_sleep(void);
62d60e9f	79
0ebfff14	80	static struct device_node *pSeries_mpic_node;
1da177e4	81
8446196a	82	static void pSeries_show_cpuinfo(struct seq_file *m)
1da177e4 LT	83	{
	84	struct device_node *root;
	85	const char *model = "";
	86
	87	root = of_find_node_by_path("/");
	88	if (root)
e2eb6392	89	model = of_get_property(root, "model", NULL);
1da177e4 LT	90	seq_printf(m, "machine\t\t: CHRP %s\n", model);
	91	of_node_put(root);
	92	}
	93
	94	/* Initialize firmware assisted non-maskable interrupts if
	95	* the firmware supports this feature.
1da177e4 LT	96	*/
	97	static void __init fwnmi_init(void)
	98	{
8c4f1f29 ME	99	unsigned long system_reset_addr, machine_check_addr;
8c4f1f29 ME	100
1da177e4 LT	101	int ibm_nmi_register = rtas_token("ibm,nmi-register");
	102	if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
	103	return;
8c4f1f29 ME	104
	105	/* If the kernel's not linked at zero we point the firmware at low
	106	* addresses anyway, and use a trampoline to get to the real code. */
	107	system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START;
	108	machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
	109
	110	if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
	111	machine_check_addr))
1da177e4 LT	112	fwnmi_active = 1;
	113	}
	114
541b2755	115	static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
b9e5b4e6	116	{
35a84c2f	117	unsigned int cascade_irq = i8259_irq();
0ebfff14	118	if (cascade_irq != NO_IRQ)
7d12e780	119	generic_handle_irq(cascade_irq);
0ebfff14	120	desc->chip->eoi(irq);
b9e5b4e6 BH	121	}
b9e5b4e6 BH	122
30d6ad25	123	static void __init pseries_setup_i8259_cascade(void)
032ace7e ME	124	{
032ace7e ME	125	struct device_node np, old, *found = NULL;
30d6ad25	126	unsigned int cascade;
032ace7e ME	127	const u32 *addrp;
032ace7e ME	128	unsigned long intack = 0;
30d6ad25	129	int naddr;
032ace7e	130
30d6ad25	131	for_each_node_by_type(np, "interrupt-controller") {
032ace7e ME	132	if (of_device_is_compatible(np, "chrp,iic")) {
	133	found = np;
	134	break;
	135	}
30d6ad25 ME	136	}
30d6ad25 ME	137
032ace7e	138	if (found == NULL) {
30d6ad25	139	printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
032ace7e ME	140	return;
032ace7e ME	141	}
30d6ad25	142
032ace7e ME	143	cascade = irq_of_parse_and_map(found, 0);
032ace7e ME	144	if (cascade == NO_IRQ) {
30d6ad25	145	printk(KERN_ERR "pic: failed to map cascade interrupt");
032ace7e ME	146	return;
032ace7e ME	147	}
30d6ad25	148	pr_debug("pic: cascade mapped to irq %d\n", cascade);
032ace7e ME	149
	150	for (old = of_node_get(found); old != NULL ; old = np) {
	151	np = of_get_parent(old);
	152	of_node_put(old);
	153	if (np == NULL)
	154	break;
	155	if (strcmp(np->name, "pci") != 0)
	156	continue;
	157	addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
	158	if (addrp == NULL)
	159	continue;
	160	naddr = of_n_addr_cells(np);
	161	intack = addrp[naddr-1];
	162	if (naddr > 1)
	163	intack \|= ((unsigned long)addrp[naddr-2]) << 32;
	164	}
	165	if (intack)
30d6ad25	166	printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
032ace7e ME	167	i8259_init(found, intack);
	168	of_node_put(found);
	169	set_irq_chained_handler(cascade, pseries_8259_cascade);
	170	}
	171
0ebfff14	172	static void __init pseries_mpic_init_IRQ(void)
1da177e4	173	{
f01567d6	174	struct device_node *np;
954a46e2	175	const unsigned int *opprop;
1da177e4	176	unsigned long openpic_addr = 0;
0ebfff14 BH	177	int naddr, n, i, opplen;
0ebfff14 BH	178	struct mpic *mpic;
1da177e4	179
0ebfff14	180	np = of_find_node_by_path("/");
a8bda5dd	181	naddr = of_n_addr_cells(np);
e2eb6392	182	opprop = of_get_property(np, "platform-open-pic", &opplen);
1da177e4	183	if (opprop != 0) {
0ebfff14	184	openpic_addr = of_read_number(opprop, naddr);
1da177e4 LT	185	printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
1da177e4 LT	186	}
0ebfff14	187	of_node_put(np);
1da177e4 LT	188
	189	BUG_ON(openpic_addr == 0);
	190
1da177e4	191	/* Setup the openpic driver */
0ebfff14 BH	192	mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
	193	MPIC_PRIMARY,
	194	16, 250, /* isu size, irq count */
	195	" MPIC ");
	196	BUG_ON(mpic == NULL);
	197
	198	/* Add ISUs */
	199	opplen /= sizeof(u32);
	200	for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
	201	unsigned long isuaddr = of_read_number(opprop + i, naddr);
	202	mpic_assign_isu(mpic, n, isuaddr);
	203	}
	204
	205	/* All ISUs are setup, complete initialization */
	206	mpic_init(mpic);
	207
	208	/* Look for cascade */
f01567d6	209	pseries_setup_i8259_cascade();
1da177e4 LT	210	}
1da177e4 LT	211
032ace7e ME	212	static void __init pseries_xics_init_IRQ(void)
	213	{
	214	xics_init_IRQ();
30d6ad25	215	pseries_setup_i8259_cascade();
032ace7e ME	216	}
032ace7e ME	217
180a3362 ME	218	static void pseries_lpar_enable_pmcs(void)
	219	{
	220	unsigned long set, reset;
	221
180a3362 ME	222	set = 1UL << 63;
	223	reset = 0;
	224	plpar_hcall_norets(H_PERFMON, set, reset);
	225
	226	/* instruct hypervisor to maintain PMCs */
	227	if (firmware_has_feature(FW_FEATURE_SPLPAR))
3356bb9f	228	get_lppaca()->pmcregs_in_use = 1;
180a3362 ME	229	}
180a3362 ME	230
0ebfff14 BH	231	static void __init pseries_discover_pic(void)
	232	{
	233	struct device_node *np;
954a46e2	234	const char *typep;
0ebfff14 BH	235
	236	for (np = NULL; (np = of_find_node_by_name(np,
	237	"interrupt-controller"));) {
e2eb6392	238	typep = of_get_property(np, "compatible", NULL);
0ebfff14 BH	239	if (strstr(typep, "open-pic")) {
	240	pSeries_mpic_node = of_node_get(np);
	241	ppc_md.init_IRQ = pseries_mpic_init_IRQ;
	242	ppc_md.get_irq = mpic_get_irq;
dce623e0	243	setup_kexec_cpu_down_mpic();
0ebfff14	244	smp_init_pseries_mpic();
0ebfff14 BH	245	return;
0ebfff14 BH	246	} else if (strstr(typep, "ppc-xicp")) {
032ace7e	247	ppc_md.init_IRQ = pseries_xics_init_IRQ;
dce623e0	248	setup_kexec_cpu_down_xics();
0ebfff14	249	smp_init_pseries_xics();
0ebfff14 BH	250	return;
	251	}
	252	}
	253	printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
	254	" interrupt-controller\n");
	255	}
	256
	257	static void __init pSeries_setup_arch(void)
	258	{
	259	/* Discover PIC type and setup ppc_md accordingly */
	260	pseries_discover_pic();
	261
1da177e4 LT	262	/* openpic global configuration register (64-bit format). */
	263	/* openpic Interrupt Source Unit pointer (64-bit format). */
	264	/* python0 facility area (mmio) (64-bit format) REAL address. */
	265
	266	/* init to some ~sane value until calibrate_delay() runs */
	267	loops_per_jiffy = 50000000;
	268
1da177e4 LT	269	fwnmi_init();
	270
	271	/* Find and initialize PCI host bridges */
	272	init_pci_config_tokens();
1da177e4	273	find_and_init_phbs();
0160f53e	274	eeh_init();
1da177e4	275
1da177e4 LT	276	pSeries_nvram_init();
1da177e4 LT	277
62d60e9f	278	/* Choose an idle loop */
1ababe11	279	if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
8d15a3e5	280	vpa_init(boot_cpuid);
3356bb9f	281	if (get_lppaca()->shared_proc) {
4baaf0cf	282	printk(KERN_DEBUG "Using shared processor idle loop\n");
fbd7740f	283	ppc_md.power_save = pseries_shared_idle_sleep;
62d60e9f	284	} else {
4baaf0cf	285	printk(KERN_DEBUG "Using dedicated idle loop\n");
fbd7740f	286	ppc_md.power_save = pseries_dedicated_idle_sleep;
62d60e9f ME	287	}
62d60e9f ME	288	} else {
4baaf0cf	289	printk(KERN_DEBUG "Using default idle loop\n");
62d60e9f	290	}
180a3362	291
57cfb814	292	if (firmware_has_feature(FW_FEATURE_LPAR))
180a3362 ME	293	ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
	294	else
	295	ppc_md.enable_pmcs = power4_enable_pmcs;
1da177e4 LT	296	}
	297
	298	static int __init pSeries_init_panel(void)
	299	{
	300	/* Manually leave the kernel version on the panel. */
	301	ppc_md.progress("Linux ppc64\n", 0);
96b644bd	302	ppc_md.progress(init_utsname()->version, 0);
1da177e4 LT	303
	304	return 0;
	305	}
	306	arch_initcall(pSeries_init_panel);
	307
cab0af98 ME	308	static int pseries_set_dabr(unsigned long dabr)
cab0af98 ME	309	{
76032de8	310	return plpar_hcall_norets(H_SET_DABR, dabr);
cab0af98 ME	311	}
cab0af98 ME	312
76032de8 ME	313	static int pseries_set_xdabr(unsigned long dabr)
	314	{
	315	/* We want to catch accesses from kernel and userspace */
	316	return plpar_hcall_norets(H_SET_XDABR, dabr,
	317	H_DABRX_KERNEL \| H_DABRX_USER);
	318	}
1da177e4	319
e46de429 RJ	320	#define CMO_CHARACTERISTICS_TOKEN 44
	321	#define CMO_MAXLENGTH 1026
	322
	323	/**
	324	* fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
	325	* handle that here. (Stolen from parse_system_parameter_string)
	326	*/
	327	void pSeries_cmo_feature_init(void)
	328	{
	329	char ptr, key, value, end;
	330	int call_status;
81f14997	331	int page_order = IOMMU_PAGE_SHIFT;
e46de429 RJ	332
	333	pr_debug(" -> fw_cmo_feature_init()\n");
	334	spin_lock(&rtas_data_buf_lock);
	335	memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
	336	call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
	337	NULL,
	338	CMO_CHARACTERISTICS_TOKEN,
	339	__pa(rtas_data_buf),
	340	RTAS_DATA_BUF_SIZE);
	341
	342	if (call_status != 0) {
	343	spin_unlock(&rtas_data_buf_lock);
	344	pr_debug("CMO not available\n");
	345	pr_debug(" <- fw_cmo_feature_init()\n");
	346	return;
	347	}
	348
	349	end = rtas_data_buf + CMO_MAXLENGTH - 2;
	350	ptr = rtas_data_buf + 2; /* step over strlen value */
	351	key = value = ptr;
	352
	353	while (*ptr && (ptr <= end)) {
	354	/* Separate the key and value by replacing '=' with '\0' and
	355	* point the value at the string after the '='
	356	*/
	357	if (ptr[0] == '=') {
	358	ptr[0] = '\0';
	359	value = ptr + 1;
	360	} else if (ptr[0] == '\0' \|\| ptr[0] == ',') {
	361	/* Terminate the string containing the key/value pair */
	362	ptr[0] = '\0';
	363
	364	if (key == value) {
	365	pr_debug("Malformed key/value pair\n");
	366	/* Never found a '=', end processing */
	367	break;
	368	}
	369
81f14997 RJ	370	if (0 == strcmp(key, "CMOPageSize"))
	371	page_order = simple_strtol(value, NULL, 10);
	372	else if (0 == strcmp(key, "PrPSP"))
	373	CMO_PrPSP = simple_strtol(value, NULL, 10);
e46de429	374	else if (0 == strcmp(key, "SecPSP"))
81f14997	375	CMO_SecPSP = simple_strtol(value, NULL, 10);
e46de429 RJ	376	value = key = ptr + 1;
	377	}
	378	ptr++;
	379	}
	380
81f14997 RJ	381	/* Page size is returned as the power of 2 of the page size,
	382	* convert to the page size in bytes before returning
	383	*/
	384	CMO_PageSize = 1 << page_order;
	385	pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
	386
	387	if (CMO_PrPSP != -1 \|\| CMO_SecPSP != -1) {
e46de429	388	pr_info("CMO enabled\n");
81f14997 RJ	389	pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
81f14997 RJ	390	CMO_SecPSP);
e46de429 RJ	391	powerpc_firmware_features \|= FW_FEATURE_CMO;
e46de429 RJ	392	} else
81f14997 RJ	393	pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
81f14997 RJ	394	CMO_SecPSP);
e46de429 RJ	395	spin_unlock(&rtas_data_buf_lock);
	396	pr_debug(" <- fw_cmo_feature_init()\n");
	397	}
	398
1da177e4 LT	399	/*
	400	* Early initialization. Relocation is on but do not reference unbolted pages
	401	*/
	402	static void __init pSeries_init_early(void)
	403	{
f7ebf352	404	pr_debug(" -> pSeries_init_early()\n");
1da177e4	405
57cfb814	406	if (firmware_has_feature(FW_FEATURE_LPAR))
1da177e4	407	find_udbg_vterm();
1da177e4	408
76032de8	409	if (firmware_has_feature(FW_FEATURE_DABR))
cab0af98	410	ppc_md.set_dabr = pseries_set_dabr;
76032de8 ME	411	else if (firmware_has_feature(FW_FEATURE_XDABR))
76032de8 ME	412	ppc_md.set_dabr = pseries_set_xdabr;
1da177e4	413
e46de429	414	pSeries_cmo_feature_init();
1da177e4 LT	415	iommu_init_early_pSeries();
1da177e4 LT	416
f7ebf352	417	pr_debug(" <- pSeries_init_early()\n");
1da177e4 LT	418	}
1da177e4 LT	419
1da177e4 LT	420	/*
	421	* Called very early, MMU is off, device-tree isn't unflattened
	422	*/
1da177e4	423
e8222502 BH	424	static int __init pSeries_probe_hypertas(unsigned long node,
	425	const char *uname, int depth,
	426	void *data)
1da177e4	427	{
ca8ffc97 MN	428	const char *hypertas;
	429	unsigned long len;
	430
e8222502 BH	431	if (depth != 1 \|\|
e8222502 BH	432	(strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
ca8ffc97 MN	433	return 0;
	434
	435	hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
	436	if (!hypertas)
	437	return 1;
e8222502	438
ca8ffc97 MN	439	powerpc_firmware_features \|= FW_FEATURE_LPAR;
ca8ffc97 MN	440	fw_feature_init(hypertas, len);
e8222502	441
ca8ffc97	442	return 1;
e8222502 BH	443	}
	444
	445	static int __init pSeries_probe(void)
	446	{
133dda1e	447	unsigned long root = of_get_flat_dt_root();
5773bbcd AB	448	char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
5773bbcd AB	449
e8222502 BH	450	if (dtype == NULL)
	451	return 0;
	452	if (strcmp(dtype, "chrp"))
1da177e4 LT	453	return 0;
1da177e4 LT	454
133dda1e AB	455	/* Cell blades firmware claims to be chrp while it's not. Until this
	456	* is fixed, we need to avoid those here.
	457	*/
	458	if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") \|\|
	459	of_flat_dt_is_compatible(root, "IBM,CBEA"))
	460	return 0;
	461
f7ebf352	462	pr_debug("pSeries detected, looking for LPAR capability...\n");
1da177e4	463
e8222502 BH	464	/* Now try to figure out if we are running on LPAR */
	465	of_scan_flat_dt(pSeries_probe_hypertas, NULL);
	466
a2235354 AB	467	if (firmware_has_feature(FW_FEATURE_LPAR))
	468	hpte_init_lpar();
	469	else
	470	hpte_init_native();
	471
f7ebf352 ME	472	pr_debug("Machine is%s LPAR !\n",
f7ebf352 ME	473	(powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
57cfb814	474
1da177e4 LT	475	return 1;
	476	}
	477
e8222502	478
c66d5dd6 ME	479	DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
c66d5dd6 ME	480
fbd7740f	481	static void pseries_dedicated_idle_sleep(void)
143a1dec	482	{
050a0938	483	unsigned int cpu = smp_processor_id();
c66d5dd6	484	unsigned long start_snooze;
96366a8d	485	unsigned long in_purr, out_purr;
c66d5dd6	486
fbd7740f PM	487	/*
	488	* Indicate to the HV that we are idle. Now would be
	489	* a good time to find other work to dispatch.
	490	*/
	491	get_lppaca()->idle = 1;
d8c391a5	492	get_lppaca()->donate_dedicated_cpu = 1;
96366a8d	493	in_purr = mfspr(SPRN_PURR);
050a0938	494
fbd7740f PM	495	/*
	496	* We come in with interrupts disabled, and need_resched()
	497	* has been checked recently. If we should poll for a little
	498	* while, do so.
	499	*/
0ddd3e7d	500	if (__get_cpu_var(smt_snooze_delay)) {
fbd7740f	501	start_snooze = get_tb() +
0ddd3e7d	502	__get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
fbd7740f PM	503	local_irq_enable();
fbd7740f PM	504	set_thread_flag(TIF_POLLING_NRFLAG);
050a0938	505
fbd7740f PM	506	while (get_tb() < start_snooze) {
	507	if (need_resched() \|\| cpu_is_offline(cpu))
	508	goto out;
	509	ppc64_runlatch_off();
	510	HMT_low();
	511	HMT_very_low();
	512	}
	513
	514	HMT_medium();
	515	clear_thread_flag(TIF_POLLING_NRFLAG);
	516	smp_mb();
	517	local_irq_disable();
	518	if (need_resched() \|\| cpu_is_offline(cpu))
	519	goto out;
c66d5dd6	520	}
fbd7740f	521
0ddd3e7d	522	cede_processor();
fbd7740f PM	523
	524	out:
	525	HMT_medium();
96366a8d TB	526	out_purr = mfspr(SPRN_PURR);
96366a8d TB	527	get_lppaca()->wait_state_cycles += out_purr - in_purr;
d8c391a5	528	get_lppaca()->donate_dedicated_cpu = 0;
fbd7740f	529	get_lppaca()->idle = 0;
c66d5dd6 ME	530	}
c66d5dd6 ME	531
fbd7740f	532	static void pseries_shared_idle_sleep(void)
c66d5dd6	533	{
fbd7740f PM	534	/*
	535	* Indicate to the HV that we are idle. Now would be
	536	* a good time to find other work to dispatch.
	537	*/
	538	get_lppaca()->idle = 1;
050a0938	539
fbd7740f PM	540	/*
	541	* Yield the processor to the hypervisor. We return if
	542	* an external interrupt occurs (which are driven prior
	543	* to returning here) or if a prod occurs from another
	544	* processor. When returning here, external interrupts
	545	* are enabled.
	546	*/
	547	cede_processor();
050a0938	548
fbd7740f	549	get_lppaca()->idle = 0;
c66d5dd6 ME	550	}
c66d5dd6 ME	551
4267292b PM	552	static int pSeries_pci_probe_mode(struct pci_bus *bus)
4267292b PM	553	{
57cfb814	554	if (firmware_has_feature(FW_FEATURE_LPAR))
4267292b PM	555	return PCI_PROBE_DEVTREE;
	556	return PCI_PROBE_NORMAL;
	557	}
	558
5d30bf30 MA	559	/**
	560	* pSeries_power_off - tell firmware about how to power off the system.
	561	*
	562	* This function calls either the power-off rtas token in normal cases
	563	* or the ibm,power-off-ups token (if present & requested) in case of
	564	* a power failure. If power-off token is used, power on will only be
	565	* possible with power button press. If ibm,power-off-ups token is used
	566	* it will allow auto poweron after power is restored.
	567	*/
541b2755	568	static void pSeries_power_off(void)
5d30bf30 MA	569	{
	570	int rc;
	571	int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
	572
	573	if (rtas_flash_term_hook)
	574	rtas_flash_term_hook(SYS_POWER_OFF);
	575
	576	if (rtas_poweron_auto == 0 \|\|
	577	rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
	578	rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
	579	printk(KERN_INFO "RTAS power-off returned %d\n", rc);
	580	} else {
	581	rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
	582	printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
	583	}
	584	for (;;);
	585	}
	586
bed59275 SR	587	#ifndef CONFIG_PCI
	588	void pSeries_final_fixup(void) { }
	589	#endif
	590
e8222502 BH	591	define_machine(pseries) {
e8222502 BH	592	.name = "pSeries",
1da177e4 LT	593	.probe = pSeries_probe,
	594	.setup_arch = pSeries_setup_arch,
	595	.init_early = pSeries_init_early,
0dd194d0	596	.show_cpuinfo = pSeries_show_cpuinfo,
1da177e4 LT	597	.log_error = pSeries_log_error,
1da177e4 LT	598	.pcibios_fixup = pSeries_final_fixup,
4267292b	599	.pci_probe_mode = pSeries_pci_probe_mode,
f4fcbbe9	600	.restart = rtas_restart,
5d30bf30	601	.power_off = pSeries_power_off,
f4fcbbe9	602	.halt = rtas_halt,
8f515061	603	.panic = rtas_os_term,
773bf9c4 AB	604	.get_boot_time = rtas_get_boot_time,
	605	.get_rtc_time = rtas_get_rtc_time,
	606	.set_rtc_time = rtas_set_rtc_time,
10f7e7c1	607	.calibrate_decr = generic_calibrate_decr,
6566c6f1	608	.progress = rtas_progress,
1da177e4 LT	609	.system_reset_exception = pSeries_system_reset_exception,
	610	.machine_check_exception = pSeries_machine_check_exception,
	611	};