acpi.c

linux-2.6.15.6

/*
 *  acpi.c - Architecture-Specific Low-Level ACPI Support
 *
 *  Copyright (C) 1999 VA Linux Systems
 *  Copyright (C) 1999,2000 Walt Drummond <[e-mail]>
 *  Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
 *	David Mosberger-Tang <[e-mail]>
 *  Copyright (C) 2000 Intel Corp.
 *  Copyright (C) 2000,2001 J.I. Lee <[e-mail]>
 *  Copyright (C) 2001 Paul Diefenbaugh <[e-mail]>
 *  Copyright (C) 2001 Jenna Hall <[e-mail]>
 *  Copyright (C) 2001 Takayoshi Kochi <[e-mail]>
 *  Copyright (C) 2002 Erich Focht <[e-mail]>
 *  Copyright (C) 2004 Ashok Raj <[e-mail]>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/irq.h>
#include <linux/acpi.h>
#include <linux/efi.h>
#include <linux/mmzone.h>
#include <linux/nodemask.h>
#include <asm/io.h>
#include <asm/iosapic.h>
#include <asm/machvec.h>
#include <asm/page.h>
#include <asm/system.h>
#include <asm/numa.h>
#include <asm/sal.h>
#include <asm/cyclone.h>

#define BAD_MADT_ENTRY(entry, end) (                                        \
		(!entry) || (unsigned long)entry + sizeof(*entry) > end ||  \
		((acpi_table_entry_header *)entry)->length != sizeof(*entry))

#define PREFIX			"ACPI: "

void (*pm_idle) (void);
EXPORT_SYMBOL(pm_idle);
void (*pm_power_off) (void);
EXPORT_SYMBOL(pm_power_off);

unsigned char acpi_kbd_controller_present = 1;
unsigned char acpi_legacy_devices;

static unsigned int __initdata acpi_madt_rev;

unsigned int acpi_cpei_override;
unsigned int acpi_cpei_phys_cpuid;

#define MAX_SAPICS 256
u16 ia64_acpiid_to_sapicid[MAX_SAPICS] = {[0 ... MAX_SAPICS - 1] = -1 };

EXPORT_SYMBOL(ia64_acpiid_to_sapicid);

const char *acpi_get_sysname(void)
{
#ifdef CONFIG_IA64_GENERIC
	unsigned long rsdp_phys;
	struct acpi20_table_rsdp *rsdp;
	struct acpi_table_xsdt *xsdt;
	struct acpi_table_header *hdr;

	rsdp_phys = acpi_find_rsdp();
	if (!rsdp_phys) {
		printk(KERN_ERR
		       "ACPI 2.0 RSDP not found, default to \"dig\"\n");
		return "dig";
	}

	rsdp = (struct acpi20_table_rsdp *)__va(rsdp_phys);
	if (strncmp(rsdp->signature, RSDP_SIG, sizeof(RSDP_SIG) - 1)) {
		printk(KERN_ERR
		       "ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
		return "dig";
	}

	xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_address);
	hdr = &xsdt->header;
	if (strncmp(hdr->signature, XSDT_SIG, sizeof(XSDT_SIG) - 1)) {
		printk(KERN_ERR
		       "ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
		return "dig";
	}

	if (!strcmp(hdr->oem_id, "HP")) {
		return "hpzx1";
	} else if (!strcmp(hdr->oem_id, "SGI")) {
		return "sn2";
	}

	return "dig";
#else
# if defined (CONFIG_IA64_HP_SIM)
	return "hpsim";
# elif defined (CONFIG_IA64_HP_ZX1)
	return "hpzx1";
# elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
	return "hpzx1_swiotlb";
# elif defined (CONFIG_IA64_SGI_SN2)
	return "sn2";
# elif defined (CONFIG_IA64_DIG)
	return "dig";
# else
#	error Unknown platform.  Fix acpi.c.
# endif
#endif
}

#ifdef CONFIG_ACPI

#define ACPI_MAX_PLATFORM_INTERRUPTS	256

/* Array to record platform interrupt vectors for generic interrupt routing. */
int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
	[0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
};

enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;

/*
 * Interrupt routing API for device drivers.  Provides interrupt vector for
 * a generic platform event.  Currently only CPEI is implemented.
 */
int acpi_request_vector(u32 int_type)
{
	int vector = -1;

	if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
		/* corrected platform error interrupt */
		vector = platform_intr_list[int_type];
	} else
		printk(KERN_ERR
		       "acpi_request_vector(): invalid interrupt type\n");
	return vector;
}

char *__acpi_map_table(unsigned long phys_addr, unsigned long size)
{
	return __va(phys_addr);
}

/* --------------------------------------------------------------------------
                            Boot-time Table Parsing
   -------------------------------------------------------------------------- */

static int total_cpus __initdata;
static int available_cpus __initdata;
struct acpi_table_madt *acpi_madt __initdata;
static u8 has_8259;

static int __init
acpi_parse_lapic_addr_ovr(acpi_table_entry_header * header,
			  const unsigned long end)
{
	struct acpi_table_lapic_addr_ovr *lapic;

	lapic = (struct acpi_table_lapic_addr_ovr *)header;

	if (BAD_MADT_ENTRY(lapic, end))
		return -EINVAL;

	if (lapic->address) {
		iounmap(ipi_base_addr);
		ipi_base_addr = ioremap(lapic->address, 0);
	}
	return 0;
}

static int __init
acpi_parse_lsapic(acpi_table_entry_header * header, const unsigned long end)
{
	struct acpi_table_lsapic *lsapic;

	lsapic = (struct acpi_table_lsapic *)header;

	if (BAD_MADT_ENTRY(lsapic, end))
		return -EINVAL;

	if (lsapic->flags.enabled) {
#ifdef CONFIG_SMP
		smp_boot_data.cpu_phys_id[available_cpus] =
		    (lsapic->id << 8) | lsapic->eid;
#endif
		ia64_acpiid_to_sapicid[lsapic->acpi_id] =
		    (lsapic->id << 8) | lsapic->eid;
		++available_cpus;
	}

	total_cpus++;
	return 0;
}

static int __init
acpi_parse_lapic_nmi(acpi_table_entry_header * header, const unsigned long end)
{
	struct acpi_table_lapic_nmi *lacpi_nmi;

	lacpi_nmi = (struct acpi_table_lapic_nmi *)header;

	if (BAD_MADT_ENTRY(lacpi_nmi, end))
		return -EINVAL;

	/* TBD: Support lapic_nmi entries */
	return 0;
}

static int __init
acpi_parse_iosapic(acpi_table_entry_header * header, const unsigned long end)
{
	struct acpi_table_iosapic *iosapic;

	iosapic = (struct acpi_table_iosapic *)header;

	if (BAD_MADT_ENTRY(iosapic, end))
		return -EINVAL;

	return iosapic_init(iosapic->address, iosapic->global_irq_base);
}

static int __init
acpi_parse_plat_int_src(acpi_table_entry_header * header,
			const unsigned long end)
{
	struct acpi_table_plat_int_src *plintsrc;
	int vector;

	plintsrc = (struct acpi_table_plat_int_src *)header;

	if (BAD_MADT_ENTRY(plintsrc, end))
		return -EINVAL;

	/*
	 * Get vector assignment for this interrupt, set attributes,
	 * and program the IOSAPIC routing table.
	 */
	vector = iosapic_register_platform_intr(plintsrc->type,
						plintsrc->global_irq,
						plintsrc->iosapic_vector,
						plintsrc->eid,
						plintsrc->id,
						(plintsrc->flags.polarity ==
						 1) ? IOSAPIC_POL_HIGH :
						IOSAPIC_POL_LOW,
						(plintsrc->flags.trigger ==
						 1) ? IOSAPIC_EDGE :
						IOSAPIC_LEVEL);

	platform_intr_list[plintsrc->type] = vector;
	if (acpi_madt_rev > 1) {
		acpi_cpei_override = plintsrc->plint_flags.cpei_override_flag;
	}

	/*
	 * Save the physical id, so we can check when its being removed
	 */
	acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;

	return 0;
}

unsigned int can_cpei_retarget(void)
{
	extern int cpe_vector;

	/*
	 * Only if CPEI is supported and the override flag
	 * is present, otherwise return that its re-targettable
	 * if we are in polling mode.
	 */
	if (cpe_vector > 0 && !acpi_cpei_override)
		return 0;
	else
		return 1;
}

unsigned int is_cpu_cpei_target(unsigned int cpu)
{
	unsigned int logical_id;

	logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);

	if (logical_id == cpu)
		return 1;
	else
		return 0;
}

void set_cpei_target_cpu(unsigned int cpu)
{
	acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
}

unsigned int get_cpei_target_cpu(void)
{
	return acpi_cpei_phys_cpuid;
}

static int __init
acpi_parse_int_src_ovr(acpi_table_entry_header * header,
		       const unsigned long end)
{
	struct acpi_table_int_src_ovr *p;

	p = (struct acpi_table_int_src_ovr *)header;

	if (BAD_MADT_ENTRY(p, end))
		return -EINVAL;

	iosapic_override_isa_irq(p->bus_irq, p->global_irq,
				 (p->flags.polarity ==
				  1) ? IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
				 (p->flags.trigger ==
				  1) ? IOSAPIC_EDGE : IOSAPIC_LEVEL);
	return 0;
}

static int __init
acpi_parse_nmi_src(acpi_table_entry_header * header, const unsigned long end)
{
	struct acpi_table_nmi_src *nmi_src;

	nmi_src = (struct acpi_table_nmi_src *)header;

	if (BAD_MADT_ENTRY(nmi_src, end))
		return -EINVAL;

	/* TBD: Support nimsrc entries */
	return 0;
}

static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
	if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {

		/*
		 * Unfortunately ITC_DRIFT is not yet part of the
		 * official SAL spec, so the ITC_DRIFT bit is not
		 * set by the BIOS on this hardware.
		 */
		sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;

		cyclone_setup();
	}
}

static int __init acpi_parse_madt(unsigned long phys_addr, unsigned long size)
{
	if (!phys_addr || !size)
		return -EINVAL;

	acpi_madt = (struct acpi_table_madt *)__va(phys_addr);

	acpi_madt_rev = acpi_madt->header.revision;

	/* remember the value for reference after free_initmem() */
#ifdef CONFIG_ITANIUM
	has_8259 = 1;		/* Firmware on old Itanium systems is broken */
#else
	has_8259 = acpi_madt->flags.pcat_compat;
#endif
	iosapic_system_init(has_8259);

	/* Get base address of IPI Message Block */

	if (acpi_madt->lapic_address)
		ipi_base_addr = ioremap(acpi_madt->lapic_address, 0);

	printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);

	acpi_madt_oem_check(acpi_madt->header.oem_id,
			    acpi_madt->header.oem_table_id);

	return 0;
}

#ifdef CONFIG_ACPI_NUMA

#undef SLIT_DEBUG

#define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)

static int __initdata srat_num_cpus;	/* number of cpus */
static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
#define pxm_bit_set(bit)	(set_bit(bit,(void *)pxm_flag))
#define pxm_bit_test(bit)	(test_bit(bit,(void *)pxm_flag))
/* maps to convert between proximity domain and logical node ID */
int __devinitdata pxm_to_nid_map[MAX_PXM_DOMAINS];
int __initdata nid_to_pxm_map[MAX_NUMNODES];
static struct acpi_table_slit __initdata *slit_table;

/*
 * ACPI 2.0 SLIT (System Locality Information Table)
 * http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
 */
void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
{
	u32 len;

	len = sizeof(struct acpi_table_header) + 8
	    + slit->localities * slit->localities;
	if (slit->header.length != len) {
		printk(KERN_ERR
		       "ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
		       len, slit->header.length);
		memset(numa_slit, 10, sizeof(numa_slit));
		return;
	}
	slit_table = slit;
}

void __init
acpi_numa_processor_affinity_init(struct acpi_table_processor_affinity *pa)
{
	/* record this node in proximity bitmap */
	pxm_bit_set(pa->proximity_domain);

	node_cpuid[srat_num_cpus].phys_id =
	    (pa->apic_id << 8) | (pa->lsapic_eid);
	/* nid should be overridden as logical node id later */
	node_cpuid[srat_num_cpus].nid = pa->proximity_domain;
	srat_num_cpus++;
}

void __init
acpi_numa_memory_affinity_init(struct acpi_table_memory_affinity *ma)
{
	unsigned long paddr, size;
	u8 pxm;
	struct node_memblk_s *p, *q, *pend;

	pxm = ma->proximity_domain;

	/* fill node memory chunk structure */
	paddr = ma->base_addr_hi;
	paddr = (paddr << 32) | ma->base_addr_lo;
	size = ma->length_hi;
	size = (size << 32) | ma->length_lo;