[linux-2.6-block.git] / arch / arm64 / kernel / acpi.c

/*
 *  ARM64 Specific Low-Level ACPI Boot Support
 *
 *  Copyright (C) 2013-2014, Linaro Ltd.
 *	Author: Al Stone <al.stone@linaro.org>
 *	Author: Graeme Gregory <graeme.gregory@linaro.org>
 *	Author: Hanjun Guo <hanjun.guo@linaro.org>
 *	Author: Tomasz Nowicki <tomasz.nowicki@linaro.org>
 *	Author: Naresh Bhat <naresh.bhat@linaro.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */

#define pr_fmt(fmt) "ACPI: " fmt

#include <linux/acpi.h>
#include <linux/bootmem.h>
#include <linux/cpumask.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/memblock.h>
#include <linux/of_fdt.h>
#include <linux/smp.h>

#include <asm/cputype.h>
#include <asm/cpu_ops.h>
#include <asm/smp_plat.h>

#ifdef CONFIG_ACPI_APEI
# include <linux/efi.h>
# include <asm/pgtable.h>
#endif

int acpi_noirq = 1;		/* skip ACPI IRQ initialization */
int acpi_disabled = 1;
EXPORT_SYMBOL(acpi_disabled);

int acpi_pci_disabled = 1;	/* skip ACPI PCI scan and IRQ initialization */
EXPORT_SYMBOL(acpi_pci_disabled);

static bool param_acpi_off __initdata;
static bool param_acpi_on __initdata;
static bool param_acpi_force __initdata;

static int __init parse_acpi(char *arg)
{
	if (!arg)
		return -EINVAL;

	/* "acpi=off" disables both ACPI table parsing and interpreter */
	if (strcmp(arg, "off") == 0)
		param_acpi_off = true;
	else if (strcmp(arg, "on") == 0) /* prefer ACPI over DT */
		param_acpi_on = true;
	else if (strcmp(arg, "force") == 0) /* force ACPI to be enabled */
		param_acpi_force = true;
	else
		return -EINVAL;	/* Core will print when we return error */

	return 0;
}
early_param("acpi", parse_acpi);

static int __init dt_scan_depth1_nodes(unsigned long node,
				       const char *uname, int depth,
				       void *data)
{
	/*
	 * Ignore anything not directly under the root node; we'll
	 * catch its parent instead.
	 */
	if (depth != 1)
		return 0;

	if (strcmp(uname, "chosen") == 0)
		return 0;

	if (strcmp(uname, "hypervisor") == 0 &&
	    of_flat_dt_is_compatible(node, "xen,xen"))
		return 0;

	/*
	 * This node at depth 1 is neither a chosen node nor a xen node,
	 * which we do not expect.
	 */
	return 1;
}

/*
 * __acpi_map_table() will be called before page_init(), so early_ioremap()
 * or early_memremap() should be called here to for ACPI table mapping.
 */
char *__init __acpi_map_table(unsigned long phys, unsigned long size)
{
	if (!size)
		return NULL;

	return early_memremap(phys, size);
}

void __init __acpi_unmap_table(char *map, unsigned long size)
{
	if (!map || !size)
		return;

	early_memunmap(map, size);
}

bool __init acpi_psci_present(void)
{
	return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_COMPLIANT;
}

/* Whether HVC must be used instead of SMC as the PSCI conduit */
bool __init acpi_psci_use_hvc(void)
{
	return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_USE_HVC;
}

/*
 * acpi_fadt_sanity_check() - Check FADT presence and carry out sanity
 *			      checks on it
 *
 * Return 0 on success,  <0 on failure
 */
static int __init acpi_fadt_sanity_check(void)
{
	struct acpi_table_header *table;
	struct acpi_table_fadt *fadt;
	acpi_status status;
	acpi_size tbl_size;
	int ret = 0;

	/*
	 * FADT is required on arm64; retrieve it to check its presence
	 * and carry out revision and ACPI HW reduced compliancy tests
	 */
	status = acpi_get_table_with_size(ACPI_SIG_FADT, 0, &table, &tbl_size);
	if (ACPI_FAILURE(status)) {
		const char *msg = acpi_format_exception(status);

		pr_err("Failed to get FADT table, %s\n", msg);
		return -ENODEV;
	}

	fadt = (struct acpi_table_fadt *)table;

	/*
	 * Revision in table header is the FADT Major revision, and there
	 * is a minor revision of FADT which was introduced by ACPI 5.1,
	 * we only deal with ACPI 5.1 or newer revision to get GIC and SMP
	 * boot protocol configuration data.
	 */
	if (table->revision < 5 ||
	   (table->revision == 5 && fadt->minor_revision < 1)) {
		pr_err("Unsupported FADT revision %d.%d, should be 5.1+\n",
		       table->revision, fadt->minor_revision);
		ret = -EINVAL;
		goto out;
	}

	if (!(fadt->flags & ACPI_FADT_HW_REDUCED)) {
		pr_err("FADT not ACPI hardware reduced compliant\n");
		ret = -EINVAL;
	}

out:
	/*
	 * acpi_get_table_with_size() creates FADT table mapping that
	 * should be released after parsing and before resuming boot
	 */
	early_acpi_os_unmap_memory(table, tbl_size);
	return ret;
}

/*
 * acpi_boot_table_init() called from setup_arch(), always.
 *	1. find RSDP and get its address, and then find XSDT
 *	2. extract all tables and checksums them all
 *	3. check ACPI FADT revision
 *	4. check ACPI FADT HW reduced flag
 *
 * We can parse ACPI boot-time tables such as MADT after
 * this function is called.
 *
 * On return ACPI is enabled if either:
 *
 * - ACPI tables are initialized and sanity checks passed
 * - acpi=force was passed in the command line and ACPI was not disabled
 *   explicitly through acpi=off command line parameter
 *
 * ACPI is disabled on function return otherwise
 */
void __init acpi_boot_table_init(void)
{
	/*
	 * Enable ACPI instead of device tree unless
	 * - ACPI has been disabled explicitly (acpi=off), or
	 * - the device tree is not empty (it has more than just a /chosen node,
	 *   and a /hypervisor node when running on Xen)
	 *   and ACPI has not been [force] enabled (acpi=on|force)
	 */
	if (param_acpi_off ||
	    (!param_acpi_on && !param_acpi_force &&
	     of_scan_flat_dt(dt_scan_depth1_nodes, NULL)))
		return;

	/*
	 * ACPI is disabled at this point. Enable it in order to parse
	 * the ACPI tables and carry out sanity checks
	 */
	enable_acpi();

	/*
	 * If ACPI tables are initialized and FADT sanity checks passed,
	 * leave ACPI enabled and carry on booting; otherwise disable ACPI
	 * on initialization error.
	 * If acpi=force was passed on the command line it forces ACPI
	 * to be enabled even if its initialization failed.
	 */
	if (acpi_table_init() || acpi_fadt_sanity_check()) {
		pr_err("Failed to init ACPI tables\n");
		if (!param_acpi_force)
			disable_acpi();
	}
}

#ifdef CONFIG_ACPI_APEI
pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr)
{
	/*
	 * According to "Table 8 Map: EFI memory types to AArch64 memory
	 * types" of UEFI 2.5 section 2.3.6.1, each EFI memory type is
	 * mapped to a corresponding MAIR attribute encoding.
	 * The EFI memory attribute advises all possible capabilities
	 * of a memory region. We use the most efficient capability.
	 */

	u64 attr;

	attr = efi_mem_attributes(addr);
	if (attr & EFI_MEMORY_WB)
		return PAGE_KERNEL;
	if (attr & EFI_MEMORY_WT)
		return __pgprot(PROT_NORMAL_WT);
	if (attr & EFI_MEMORY_WC)
		return __pgprot(PROT_NORMAL_NC);
	return __pgprot(PROT_DEVICE_nGnRnE);
}
#endif
Commit	Line	Data
37655163 AS	1	/*
	2	* ARM64 Specific Low-Level ACPI Boot Support
	3	*
	4	* Copyright (C) 2013-2014, Linaro Ltd.
	5	* Author: Al Stone <al.stone@linaro.org>
	6	* Author: Graeme Gregory <graeme.gregory@linaro.org>
	7	* Author: Hanjun Guo <hanjun.guo@linaro.org>
	8	* Author: Tomasz Nowicki <tomasz.nowicki@linaro.org>
	9	* Author: Naresh Bhat <naresh.bhat@linaro.org>
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License version 2 as
	13	* published by the Free Software Foundation.
	14	*/
	15
	16	#define pr_fmt(fmt) "ACPI: " fmt
	17
	18	#include <linux/acpi.h>
	19	#include <linux/bootmem.h>
	20	#include <linux/cpumask.h>
	21	#include <linux/init.h>
	22	#include <linux/irq.h>
	23	#include <linux/irqdomain.h>
	24	#include <linux/memblock.h>
b10d79f7	25	#include <linux/of_fdt.h>
37655163 AS	26	#include <linux/smp.h>
37655163 AS	27
fccb9a81 HG	28	#include <asm/cputype.h>
	29	#include <asm/cpu_ops.h>
	30	#include <asm/smp_plat.h>
	31
89e44b51 JZZ	32	#ifdef CONFIG_ACPI_APEI
	33	# include <linux/efi.h>
	34	# include <asm/pgtable.h>
	35	#endif
	36
b10d79f7 AS	37	int acpi_noirq = 1; /* skip ACPI IRQ initialization */
b10d79f7 AS	38	int acpi_disabled = 1;
37655163 AS	39	EXPORT_SYMBOL(acpi_disabled);
37655163 AS	40
b10d79f7	41	int acpi_pci_disabled = 1; /* skip ACPI PCI scan and IRQ initialization */
37655163 AS	42	EXPORT_SYMBOL(acpi_pci_disabled);
37655163 AS	43
b10d79f7	44	static bool param_acpi_off __initdata;
6a1f5471	45	static bool param_acpi_on __initdata;
fb094eb1	46	static bool param_acpi_force __initdata;
b10d79f7 AS	47
	48	static int __init parse_acpi(char *arg)
	49	{
	50	if (!arg)
	51	return -EINVAL;
	52
	53	/* "acpi=off" disables both ACPI table parsing and interpreter */
	54	if (strcmp(arg, "off") == 0)
	55	param_acpi_off = true;
6a1f5471 AB	56	else if (strcmp(arg, "on") == 0) /* prefer ACPI over DT */
6a1f5471 AB	57	param_acpi_on = true;
b10d79f7 AS	58	else if (strcmp(arg, "force") == 0) /* force ACPI to be enabled */
	59	param_acpi_force = true;
	60	else
	61	return -EINVAL; /* Core will print when we return error */
	62
	63	return 0;
	64	}
	65	early_param("acpi", parse_acpi);
	66
	67	static int __init dt_scan_depth1_nodes(unsigned long node,
	68	const char *uname, int depth,
	69	void *data)
	70	{
	71	/*
9981293f MR	72	* Ignore anything not directly under the root node; we'll
9981293f MR	73	* catch its parent instead.
b10d79f7	74	*/
9981293f MR	75	if (depth != 1)
9981293f MR	76	return 0;
2366c7fd	77
9981293f MR	78	if (strcmp(uname, "chosen") == 0)
	79	return 0;
	80
	81	if (strcmp(uname, "hypervisor") == 0 &&
	82	of_flat_dt_is_compatible(node, "xen,xen"))
	83	return 0;
	84
	85	/*
	86	* This node at depth 1 is neither a chosen node nor a xen node,
	87	* which we do not expect.
	88	*/
	89	return 1;
b10d79f7 AS	90	}
b10d79f7 AS	91
37655163 AS	92	/*
	93	* __acpi_map_table() will be called before page_init(), so early_ioremap()
	94	* or early_memremap() should be called here to for ACPI table mapping.
	95	*/
	96	char *__init __acpi_map_table(unsigned long phys, unsigned long size)
	97	{
	98	if (!size)
	99	return NULL;
	100
	101	return early_memremap(phys, size);
	102	}
	103
	104	void __init __acpi_unmap_table(char *map, unsigned long size)
	105	{
	106	if (!map \|\| !size)
	107	return;
	108
	109	early_memunmap(map, size);
	110	}
	111
c5a13305 MR	112	bool __init acpi_psci_present(void)
	113	{
	114	return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_COMPLIANT;
	115	}
	116
	117	/* Whether HVC must be used instead of SMC as the PSCI conduit */
	118	bool __init acpi_psci_use_hvc(void)
	119	{
	120	return acpi_gbl_FADT.arm_boot_flags & ACPI_FADT_PSCI_USE_HVC;
	121	}
	122
54971e43 LP	123	/*
	124	* acpi_fadt_sanity_check() - Check FADT presence and carry out sanity
	125	* checks on it
	126	*
	127	* Return 0 on success, <0 on failure
	128	*/
	129	static int __init acpi_fadt_sanity_check(void)
37655163	130	{
54971e43 LP	131	struct acpi_table_header *table;
	132	struct acpi_table_fadt *fadt;
	133	acpi_status status;
	134	acpi_size tbl_size;
	135	int ret = 0;
	136
	137	/*
	138	* FADT is required on arm64; retrieve it to check its presence
	139	* and carry out revision and ACPI HW reduced compliancy tests
	140	*/
	141	status = acpi_get_table_with_size(ACPI_SIG_FADT, 0, &table, &tbl_size);
	142	if (ACPI_FAILURE(status)) {
	143	const char *msg = acpi_format_exception(status);
	144
	145	pr_err("Failed to get FADT table, %s\n", msg);
	146	return -ENODEV;
	147	}
	148
	149	fadt = (struct acpi_table_fadt *)table;
37655163 AS	150
	151	/*
	152	* Revision in table header is the FADT Major revision, and there
	153	* is a minor revision of FADT which was introduced by ACPI 5.1,
	154	* we only deal with ACPI 5.1 or newer revision to get GIC and SMP
54971e43	155	* boot protocol configuration data.
37655163	156	*/
54971e43 LP	157	if (table->revision < 5 \|\|
	158	(table->revision == 5 && fadt->minor_revision < 1)) {
	159	pr_err("Unsupported FADT revision %d.%d, should be 5.1+\n",
	160	table->revision, fadt->minor_revision);
	161	ret = -EINVAL;
	162	goto out;
fccb9a81	163	}
37655163	164
54971e43 LP	165	if (!(fadt->flags & ACPI_FADT_HW_REDUCED)) {
	166	pr_err("FADT not ACPI hardware reduced compliant\n");
	167	ret = -EINVAL;
	168	}
37655163	169
54971e43 LP	170	out:
	171	/*
	172	* acpi_get_table_with_size() creates FADT table mapping that
	173	* should be released after parsing and before resuming boot
	174	*/
	175	early_acpi_os_unmap_memory(table, tbl_size);
	176	return ret;
37655163 AS	177	}
	178
	179	/*
	180	* acpi_boot_table_init() called from setup_arch(), always.
	181	* 1. find RSDP and get its address, and then find XSDT
	182	* 2. extract all tables and checksums them all
	183	* 3. check ACPI FADT revision
54971e43	184	* 4. check ACPI FADT HW reduced flag
37655163 AS	185	*
	186	* We can parse ACPI boot-time tables such as MADT after
	187	* this function is called.
54971e43	188	*
fb094eb1 LP	189	* On return ACPI is enabled if either:
	190	*
	191	* - ACPI tables are initialized and sanity checks passed
	192	* - acpi=force was passed in the command line and ACPI was not disabled
	193	* explicitly through acpi=off command line parameter
	194	*
	195	* ACPI is disabled on function return otherwise
37655163 AS	196	*/
	197	void __init acpi_boot_table_init(void)
	198	{
b10d79f7 AS	199	/*
	200	* Enable ACPI instead of device tree unless
	201	* - ACPI has been disabled explicitly (acpi=off), or
2366c7fd SZ	202	* - the device tree is not empty (it has more than just a /chosen node,
2366c7fd SZ	203	* and a /hypervisor node when running on Xen)
6a1f5471	204	* and ACPI has not been [force] enabled (acpi=on\|force)
b10d79f7 AS	205	*/
b10d79f7 AS	206	if (param_acpi_off \|\|
6a1f5471 AB	207	(!param_acpi_on && !param_acpi_force &&
6a1f5471 AB	208	of_scan_flat_dt(dt_scan_depth1_nodes, NULL)))
37655163 AS	209	return;
37655163 AS	210
54971e43 LP	211	/*
	212	* ACPI is disabled at this point. Enable it in order to parse
	213	* the ACPI tables and carry out sanity checks
	214	*/
b10d79f7 AS	215	enable_acpi();
b10d79f7 AS	216
54971e43 LP	217	/*
	218	* If ACPI tables are initialized and FADT sanity checks passed,
	219	* leave ACPI enabled and carry on booting; otherwise disable ACPI
	220	* on initialization error.
fb094eb1 LP	221	* If acpi=force was passed on the command line it forces ACPI
fb094eb1 LP	222	* to be enabled even if its initialization failed.
54971e43 LP	223	*/
	224	if (acpi_table_init() \|\| acpi_fadt_sanity_check()) {
	225	pr_err("Failed to init ACPI tables\n");
fb094eb1 LP	226	if (!param_acpi_force)
fb094eb1 LP	227	disable_acpi();
37655163 AS	228	}
37655163 AS	229	}
d60fc389	230
89e44b51 JZZ	231	#ifdef CONFIG_ACPI_APEI
	232	pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr)
	233	{
	234	/*
	235	* According to "Table 8 Map: EFI memory types to AArch64 memory
	236	* types" of UEFI 2.5 section 2.3.6.1, each EFI memory type is
	237	* mapped to a corresponding MAIR attribute encoding.
	238	* The EFI memory attribute advises all possible capabilities
	239	* of a memory region. We use the most efficient capability.
	240	*/
	241
	242	u64 attr;
	243
	244	attr = efi_mem_attributes(addr);
	245	if (attr & EFI_MEMORY_WB)
	246	return PAGE_KERNEL;
	247	if (attr & EFI_MEMORY_WT)
	248	return __pgprot(PROT_NORMAL_WT);
	249	if (attr & EFI_MEMORY_WC)
	250	return __pgprot(PROT_NORMAL_NC);
	251	return __pgprot(PROT_DEVICE_nGnRnE);
	252	}
	253	#endif