/*
 * Based on acpi.c from coreboot
 *
 * Copyright (C) 2015, Saket Sinha <saket.sinha89@gmail.com>
 *
 * SPDX-License-Identifier: GPL-2.0+
 */

#include <common.h>
#include <malloc.h>
#include <asm/post.h>
#include <linux/string.h>

#define RSDP_SIG		"RSD PTR "	/* RSDT pointer signature */
#define ACPI_TABLE_CREATOR	"UBOOT   "	/* Must be 8 bytes long! */
#define OEM_ID			"UBOOT "	/* Must be 6 bytes long! */
#define ASLC			"INTL"		/* Must be 4 bytes long! */

#define OEM_REVISION	42
#define ASL_COMPILER_REVISION	42

/* IO ports to generate SMIs */
#define APM_CNT			0xb2
#define APM_CNT_CST_CONTROL	0x85
#define APM_CNT_PST_CONTROL	0x80
#define APM_CNT_ACPI_DISABLE	0x1e
#define APM_CNT_ACPI_ENABLE	0xe1
#define APM_CNT_MBI_UPDATE	0xeb
#define APM_CNT_GNVS_UPDATE	0xea
#define APM_CNT_FINALIZE	0xcb
#define APM_CNT_LEGACY		0xcc
#define APM_ST			0xb3

/* Multiple Processor Interrupts */
#define MP_IRQ_POLARITY_DEFAULT	0x0
#define MP_IRQ_POLARITY_HIGH	0x1
#define MP_IRQ_POLARITY_LOW	0x3
#define MP_IRQ_POLARITY_MASK	0x3
#define MP_IRQ_TRIGGER_DEFAULT	0x0
#define MP_IRQ_TRIGGER_EDGE	0x4
#define MP_IRQ_TRIGGER_LEVEL	0xc
#define MP_IRQ_TRIGGER_MASK	0xc

/*
 * Interrupt assigned for SCI in order to
 * create the ACPI MADT IRQ override entry
 */
#define ACTL		0x00
#define SCIS_MASK	0x07
#define SCIS_IRQ9	0x00
#define SCIS_IRQ10	0x01
#define SCIS_IRQ11	0x02
#define SCIS_IRQ20	0x04
#define SCIS_IRQ21	0x05
#define SCIS_IRQ22	0x06
#define SCIS_IRQ23	0x07

#define ACPI_REV_ACPI_1_0	1
#define ACPI_REV_ACPI_2_0	1
#define ACPI_REV_ACPI_3_0	2
#define ACPI_REV_ACPI_4_0	3
#define ACPI_REV_ACPI_5_0	5

#define ACPI_RSDP_REV_ACPI_1_0	0
#define ACPI_RSDP_REV_ACPI_2_0	2

typedef struct acpi_gen_regaddr {
	u8  space_id;	/* Address space ID */
	u8  bit_width;	/* Register size in bits */
	u8  bit_offset;	/* Register bit offset */
	union {
		/* Reserved in ACPI 2.0 - 2.0b */
		u8  resv;
		/* Access size in ACPI 2.0c/3.0/4.0/5.0 */
		u8  access_size;
	};
	u32 addrl;	/* Register address, low 32 bits */
	u32 addrh;	/* Register address, high 32 bits */
} acpi_addr_t;


/*
 * RSDP (Root System Description Pointer)
 * Note: ACPI 1.0 didn't have length, xsdt_address, and ext_checksum
 */
struct acpi_rsdp {
	char signature[8];	/* RSDP signature */
	u8 checksum;		/* Checksum of the first 20 bytes */
	char oem_id[6];		/* OEM ID */
	u8 revision;		/* 0 for ACPI 1.0, 2 for ACPI 2.0/3.0/4.0 */
	u32 rsdt_address;	/* Physical address of RSDT (32 bits) */
	u32 length;		/* Total RSDP length (incl. extended part) */
	u64 xsdt_address;	/* Physical address of XSDT (64 bits) */
	u8 ext_checksum;	/* Checksum of the whole table */
	u8 reserved[3];
};

enum acpi_address_space_type {
	ACPI_ADDRESS_SPACE_MEMORY = 0,	/* System memory */
	ACPI_ADDRESS_SPACE_IO,		/* System I/O */
	ACPI_ADDRESS_SPACE_PCI,		/* PCI config space */
	ACPI_ADDRESS_SPACE_EC,		/* Embedded controller */
	ACPI_ADDRESS_SPACE_SMBUS,	/* SMBus */
	ACPI_ADDRESS_SPACE_PCC = 0x0a,	/* Platform Comm. Channel */
	ACPI_ADDRESS_SPACE_FIXED = 0x7f	/* Functional fixed hardware */
};

/* functional fixed hardware */
#define ACPI_FFIXEDHW_VENDOR_INTEL	1	/* Intel */
#define ACPI_FFIXEDHW_CLASS_HLT		0	/* C1 Halt */
#define ACPI_FFIXEDHW_CLASS_IO_HLT	1	/* C1 I/O then Halt */
#define ACPI_FFIXEDHW_CLASS_MWAIT	2	/* MWAIT Native C-state */
#define ACPI_FFIXEDHW_FLAG_HW_COORD	1	/* Hardware Coordination bit */
#define ACPI_FFIXEDHW_FLAG_BM_STS	2	/* BM_STS avoidance bit */

/* Access size definitions for Generic address structure */
enum acpi_address_space_size {
	ACPI_ACCESS_SIZE_UNDEFINED = 0,	/* Undefined (legacy reasons) */
	ACPI_ACCESS_SIZE_BYTE_ACCESS = 1,
	ACPI_ACCESS_SIZE_WORD_ACCESS = 2,
	ACPI_ACCESS_SIZE_DWORD_ACCESS = 3,
	ACPI_ACCESS_SIZE_QWORD_ACCESS = 4
};

/* Generic ACPI header, provided by (almost) all tables */
typedef struct acpi_table_header {
	char signature[4];	/* ACPI signature (4 ASCII characters) */
	u32 length;		/* Table length in bytes (incl. header) */
	u8 revision;		/* Table version (not ACPI version!) */
	volatile u8 checksum;	/* To make sum of entire table == 0 */
	char oem_id[6];		/* OEM identification */
	char oem_table_id[8];	/* OEM table identification */
	u32 oem_revision;	/* OEM revision number */
	char asl_compiler_id[4]; /* ASL compiler vendor ID */
	u32 asl_compiler_revision; /* ASL compiler revision number */
} acpi_header_t;

/* A maximum number of 32 ACPI tables ought to be enough for now */
#define MAX_ACPI_TABLES	32

/* RSDT (Root System Description Table) */
struct acpi_rsdt {
	struct acpi_table_header header;
	u32 entry[MAX_ACPI_TABLES];
};

/* XSDT (Extended System Description Table) */
struct acpi_xsdt {
	struct acpi_table_header header;
	u64 entry[MAX_ACPI_TABLES];
};

/* MCFG (PCI Express MMIO config space BAR description table) */
struct acpi_mcfg {
	struct acpi_table_header header;
	u8 reserved[8];
};

struct acpi_mcfg_mmconfig {
	u32 base_address;
	u32 base_reserved;
	u16 pci_segment_group_number;
	u8 start_bus_number;
	u8 end_bus_number;
	u8 reserved[4];
};

/* MADT (Multiple APIC Description Table) */
struct acpi_madt {
	struct acpi_table_header header;
	u32 lapic_addr;			/* Local APIC address */
	u32 flags;			/* Multiple APIC flags */
} acpi_madt_t;

enum dev_scope_type {
	SCOPE_PCI_ENDPOINT = 1,
	SCOPE_PCI_SUB = 2,
	SCOPE_IOAPIC = 3,
	SCOPE_MSI_HPET = 4
};

typedef struct dev_scope {
	u8 type;
	u8 length;
	u8 reserved[2];
	u8 enumeration;
	u8 start_bus;
	struct {
		u8 dev;
		u8 fn;
	} path[0];
} __packed dev_scope_t;

/* MADT: APIC Structure Type*/
enum acpi_apic_types {
	LOCALAPIC	= 0,	/* Processor local APIC */
	IOAPIC,			/* I/O APIC */
	IRQSOURCEOVERRIDE,	/* Interrupt source override */
	NMITYPE,		/* NMI source */
	LOCALNMITYPE, 		/* Local APIC NMI */
	LAPICADDRESSOVERRIDE,	/* Local APIC address override */
	IOSAPIC,		/* I/O SAPIC */
	LOCALSAPIC,		/* Local SAPIC */
	PLATFORMIRQSOURCES,	/* Platform interrupt sources */
	LOCALX2SAPIC,		/* Processor local x2APIC */
	LOCALX2APICNMI,		/* Local x2APIC NMI */
};

/* MADT: Processor Local APIC Structure */
struct acpi_madt_lapic {
	u8 type;		/* Type (0) */
	u8 length;		/* Length in bytes (8) */
	u8 processor_id;	/* ACPI processor ID */
	u8 apic_id;		/* Local APIC ID */
	u32 flags;		/* Local APIC flags */
};

#define LOCAL_APIC_FLAG_ENABLED	(1 << 0)
/* bits 1-31: reserved */
#define PCAT_COMPAT		(1 << 0)
/* bits 1-31: reserved */

/* MADT: Local APIC NMI Structure */
struct acpi_madt_lapic_nmi {
	u8 type;		/* Type (4) */
	u8 length;		/* Length in bytes (6) */
	u8 processor_id;	/* ACPI processor ID */
	u16 flags;		/* MPS INTI flags */
	u8 lint;		/* Local APIC LINT# */
};

/* MADT: I/O APIC Structure */
struct acpi_madt_ioapic {
	u8 type;		/* Type (1) */
	u8 length;		/* Length in bytes (12) */
	u8 ioapic_id;		/* I/O APIC ID */
	u8 reserved;
	u32 ioapic_addr;	/* I/O APIC address */
	u32 gsi_base;		/* Global system interrupt base */
};

/* MADT: Interrupt Source Override Structure */
struct acpi_madt_irqoverride {
	u8 type;		/* Type (2) */
	u8 length;		/* Length in bytes (10) */
	u8 bus;			/* ISA (0) */
	u8 source;		/* Bus-relative int. source (IRQ) */
	u32 gsirq;		/* Global system interrupt */
	u16 flags;		/* MPS INTI flags */
};

/* FADT (Fixed ACPI Description Table) */
struct __packed acpi_fadt {
	struct acpi_table_header header;
	u32 firmware_ctrl;
	u32 dsdt;
	u8 model;
	u8 preferred_pm_profile;
	u16 sci_int;
	u32 smi_cmd;
	u8 acpi_enable;
	u8 acpi_disable;
	u8 s4bios_req;
	u8 pstate_cnt;
	u32 pm1a_evt_blk;
	u32 pm1b_evt_blk;
	u32 pm1a_cnt_blk;
	u32 pm1b_cnt_blk;
	u32 pm2_cnt_blk;
	u32 pm_tmr_blk;
	u32 gpe0_blk;
	u32 gpe1_blk;
	u8 pm1_evt_len;
	u8 pm1_cnt_len;
	u8 pm2_cnt_len;
	u8 pm_tmr_len;
	u8 gpe0_blk_len;
	u8 gpe1_blk_len;
	u8 gpe1_base;
	u8 cst_cnt;
	u16 p_lvl2_lat;
	u16 p_lvl3_lat;
	u16 flush_size;
	u16 flush_stride;
	u8 duty_offset;
	u8 duty_width;
	u8 day_alrm;
	u8 mon_alrm;
	u8 century;
	u16 iapc_boot_arch;
	u8 res2;
	u32 flags;
	struct acpi_gen_regaddr reset_reg;
	u8 reset_value;
	u8 res3;
	u8 res4;
	u8 res5;
	u32 x_firmware_ctl_l;
	u32 x_firmware_ctl_h;
	u32 x_dsdt_l;
	u32 x_dsdt_h;
	struct acpi_gen_regaddr x_pm1a_evt_blk;
	struct acpi_gen_regaddr x_pm1b_evt_blk;
	struct acpi_gen_regaddr x_pm1a_cnt_blk;
	struct acpi_gen_regaddr x_pm1b_cnt_blk;
	struct acpi_gen_regaddr x_pm2_cnt_blk;
	struct acpi_gen_regaddr x_pm_tmr_blk;
	struct acpi_gen_regaddr x_gpe0_blk;
	struct acpi_gen_regaddr x_gpe1_blk;
};

/* Flags for p_lvl2_lat and p_lvl3_lat */
#define ACPI_FADT_C2_NOT_SUPPORTED	101
#define ACPI_FADT_C3_NOT_SUPPORTED	1001

/* FADT Feature Flags */
#define ACPI_FADT_WBINVD		(1 << 0)
#define ACPI_FADT_WBINVD_FLUSH		(1 << 1)
#define ACPI_FADT_C1_SUPPORTED		(1 << 2)
#define ACPI_FADT_C2_MP_SUPPORTED	(1 << 3)
#define ACPI_FADT_POWER_BUTTON		(1 << 4)
#define ACPI_FADT_SLEEP_BUTTON		(1 << 5)
#define ACPI_FADT_FIXED_RTC		(1 << 6)
#define ACPI_FADT_S4_RTC_WAKE		(1 << 7)
#define ACPI_FADT_32BIT_TIMER		(1 << 8)
#define ACPI_FADT_DOCKING_SUPPORTED	(1 << 9)
#define ACPI_FADT_RESET_REGISTER	(1 << 10)
#define ACPI_FADT_SEALED_CASE		(1 << 11)
#define ACPI_FADT_HEADLESS		(1 << 12)
#define ACPI_FADT_SLEEP_TYPE		(1 << 13)
#define ACPI_FADT_PCI_EXPRESS_WAKE	(1 << 14)
#define ACPI_FADT_PLATFORM_CLOCK	(1 << 15)
#define ACPI_FADT_S4_RTC_VALID		(1 << 16)
#define ACPI_FADT_REMOTE_POWER_ON	(1 << 17)
#define ACPI_FADT_APIC_CLUSTER		(1 << 18)
#define ACPI_FADT_APIC_PHYSICAL		(1 << 19)
/* Bits 20-31: reserved ACPI 3.0 & 4.0 */
#define ACPI_FADT_HW_REDUCED_ACPI	(1 << 20)
#define ACPI_FADT_LOW_PWR_IDLE_S0	(1 << 21)
/* bits 22-31: reserved ACPI 5.0 */

/* FADT Boot Architecture Flags */
#define ACPI_FADT_LEGACY_DEVICES	(1 << 0)
#define ACPI_FADT_8042			(1 << 1)
#define ACPI_FADT_VGA_NOT_PRESENT	(1 << 2)
#define ACPI_FADT_MSI_NOT_SUPPORTED	(1 << 3)
#define ACPI_FADT_NO_PCIE_ASPM_CONTROL	(1 << 4)
/* No legacy devices (including 8042) */
#define ACPI_FADT_LEGACY_FREE		0x00

/* FADT Preferred Power Management Profile */
#define PM_UNSPECIFIED		0
#define PM_DESKTOP		1
#define PM_MOBILE		2
#define PM_WORKSTATION		3
#define PM_ENTERPRISE_SERVER	4
#define PM_SOHO_SERVER		5
#define PM_APPLIANCE_PC		6
#define PM_PERFORMANCE_SERVER	7
#define PM_TABLET		8	/* ACPI 5.0 */

/* FACS (Firmware ACPI Control Structure) */
struct acpi_facs {
	char signature[4];			/* "FACS" */
	u32 length;				/* Length in bytes (>= 64) */
	u32 hardware_signature;			/* Hardware signature */
	u32 firmware_waking_vector;		/* Firmware waking vector */
	u32 global_lock;			/* Global lock */
	u32 flags;				/* FACS flags */
	u32 x_firmware_waking_vector_l;		/* X FW waking vector, low */
	u32 x_firmware_waking_vector_h;		/* X FW waking vector, high */
	u8 version;				/* ACPI 4.0: 2 */
	u8 resv[31];				/* FIXME: 4.0: ospm_flags */
};

/* FACS flags */
#define ACPI_FACS_S4BIOS_F	(1 << 0)
#define ACPI_FACS_64BIT_WAKE_F	(1 << 1)
/* Bits 31..2: reserved */

/* These can be used by the target port */

unsigned long acpi_create_madt_lapics(unsigned long current);
int acpi_create_madt_ioapic(struct acpi_madt_ioapic *ioapic, u8 id, u32 addr,
			 u32 gsi_base);
int acpi_create_madt_irqoverride(struct acpi_madt_irqoverride *irqoverride,
			 u8 bus, u8 source, u32 gsirq, u16 flags);
unsigned long acpi_fill_madt(unsigned long current);
void acpi_create_fadt(struct acpi_fadt *fadt, struct acpi_facs *facs,
			 void *dsdt);
int acpi_create_madt_lapic_nmi(struct acpi_madt_lapic_nmi *lapic_nmi, u8 cpu,
			 u16 flags, u8 lint);
unsigned long write_acpi_tables(unsigned long start);