/*
 * This file is part of the flashrom project.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 * SPDX-FileCopyrightText: 2008 Stefan Wildemann <stefan.wildemann@kontron.com>
 * SPDX-FileCopyrightText: 2008 Claus Gindhart <claus.gindhart@kontron.com>
 * SPDX-FileCopyrightText: 2008 Dominik Geyer <dominik.geyer@kontron.com>
 * SPDX-FileCopyrightText: 2008 coresystems GmbH <info@coresystems.de>
 * SPDX-FileCopyrightText: 2009, 2010 Carl-Daniel Hailfinger
 * SPDX-FileCopyrightText: 2011 Stefan Tauner
 */

#include <string.h>
#include <stdbool.h>
#include <stdlib.h>
#include "programmer.h"
#include "hwaccess_physmap.h"
#include "spi.h"
#include "ich_descriptors.h"
#include "platform/udelay.h"

/* Apollo Lake */
#define APL_REG_FREG12		0xe0	/* 32 Bytes Flash Region 12 */

/* Sunrise Point */

/* Added HSFS Status bits */
#define HSFS_WRSDIS_OFF		11	/* 11: Flash Configuration Lock-Down */
#define HSFS_WRSDIS		(0x1 << HSFS_WRSDIS_OFF)
#define HSFS_PRR34_LOCKDN_OFF	12	/* 12: PRR3 PRR4 Lock-Down */
#define HSFS_PRR34_LOCKDN	(0x1 << HSFS_PRR34_LOCKDN_OFF)
/* HSFS_BERASE vanished */

/*
 * HSFC and HSFS 16-bit registers are combined into the 32-bit
 * BIOS_HSFSTS_CTL register in the Sunrise Point datasheet,
 * however we still treat them separately in order to reuse code.
 */

/*
 * HSFC Control bits
 *
 * FCYCLE is a 2 bit field (HSFC bits 1-2) on ICH9 and 4 bit field
 * (HSFC bits 1-4) on PCH100.
 *
 * ICH9 and PCH100 use the same FCYCLE values for flash operations,
 * however FCYCLE values above 3 are only supported by PCH100.
 *
 * 0: SPI Read
 * 2: SPI Write
 * 3: SPI Erase 4K
 * 4: SPI Erase 64K
 * 6: SPI RDID
 * 7: SPI Write Status
 * 8: SPI Read Status
 */
#define HSFC_FGO_OFF		0
#define HSFC_FGO		(0x1 << HSFC_FGO_OFF)
#define HSFC_FCYCLE_MASK(n)	((n) << HSFC_FCYCLE_OFF)
#define HSFC_FCYCLE_OFF		1
#define HSFC_CYCLE_READ		HSFC_FCYCLE_MASK(0x0)
#define HSFC_CYCLE_WRITE	HSFC_FCYCLE_MASK(0x2)
#define HSFC_CYCLE_BLOCK_ERASE	HSFC_FCYCLE_MASK(0x3)
#define HSFC_CYCLE_RDID		HSFC_FCYCLE_MASK(0x6)
#define HSFC_CYCLE_WR_STATUS	HSFC_FCYCLE_MASK(0x7)
#define HSFC_CYCLE_RD_STATUS	HSFC_FCYCLE_MASK(0x8)

/* PCH100 controller register definition */
#define PCH100_HSFC_FCYCLE_OFF		1
#define PCH100_HSFC_FCYCLE_BIT_WIDTH	0xf
#define PCH100_HSFC_FCYCLE	HSFC_FCYCLE_MASK(PCH100_HSFC_FCYCLE_BIT_WIDTH)
/* New HSFC Control bit */
#define PCH100_HSFC_WET_OFF	(21 - 16)	/* 5: Write Enable Type */
#define PCH100_HSFC_WET		(0x1 << PCH100_HSFC_WET_OFF)

#define PCH100_FADDR_FLA	0x07ffffff

#define PCH100_REG_DLOCK	0x0c	/* 32 Bits Discrete Lock Bits */
#define DLOCK_BMWAG_LOCKDN_OFF	0
#define DLOCK_BMWAG_LOCKDN	(0x1 << DLOCK_BMWAG_LOCKDN_OFF)
#define DLOCK_BMRAG_LOCKDN_OFF	1
#define DLOCK_BMRAG_LOCKDN	(0x1 << DLOCK_BMRAG_LOCKDN_OFF)
#define DLOCK_SBMWAG_LOCKDN_OFF	2
#define DLOCK_SBMWAG_LOCKDN	(0x1 << DLOCK_SBMWAG_LOCKDN_OFF)
#define DLOCK_SBMRAG_LOCKDN_OFF	3
#define DLOCK_SBMRAG_LOCKDN	(0x1 << DLOCK_SBMRAG_LOCKDN_OFF)
#define DLOCK_PR0_LOCKDN_OFF	8
#define DLOCK_PR0_LOCKDN	(0x1 << DLOCK_PR0_LOCKDN_OFF)
#define DLOCK_PR1_LOCKDN_OFF	9
#define DLOCK_PR1_LOCKDN	(0x1 << DLOCK_PR1_LOCKDN_OFF)
#define DLOCK_PR2_LOCKDN_OFF	10
#define DLOCK_PR2_LOCKDN	(0x1 << DLOCK_PR2_LOCKDN_OFF)
#define DLOCK_PR3_LOCKDN_OFF	11
#define DLOCK_PR3_LOCKDN	(0x1 << DLOCK_PR3_LOCKDN_OFF)
#define DLOCK_PR4_LOCKDN_OFF	12
#define DLOCK_PR4_LOCKDN	(0x1 << DLOCK_PR4_LOCKDN_OFF)
#define DLOCK_SSEQ_LOCKDN_OFF	16
#define DLOCK_SSEQ_LOCKDN	(0x1 << DLOCK_SSEQ_LOCKDN_OFF)

#define PCH100_REG_FPR0		0x84	/* 32 Bits Protected Range 0 */
#define PCH100_REG_GPR0		0x98	/* 32 Bits Global Protected Range 0 */

#define PCH100_REG_SSFSC	0xA0	/* 32 Bits Status (8) + Control (24) */
#define PCH100_REG_PREOP	0xA4	/* 16 Bits */
#define PCH100_REG_OPTYPE	0xA6	/* 16 Bits */
#define PCH100_REG_OPMENU	0xA8	/* 64 Bits */

/* ICH9 controller register definition */
#define ICH9_REG_HSFS		0x04	/* 16 Bits Hardware Sequencing Flash Status */
#define HSFS_FDONE_OFF		0	/* 0: Flash Cycle Done */
#define HSFS_FDONE		(0x1 << HSFS_FDONE_OFF)
#define HSFS_FCERR_OFF		1	/* 1: Flash Cycle Error */
#define HSFS_FCERR		(0x1 << HSFS_FCERR_OFF)
#define HSFS_AEL_OFF		2	/* 2: Access Error Log */
#define HSFS_AEL		(0x1 << HSFS_AEL_OFF)
#define HSFS_BERASE_OFF		3	/* 3-4: Block/Sector Erase Size */
#define HSFS_BERASE		(0x3 << HSFS_BERASE_OFF)
#define HSFS_SCIP_OFF		5	/* 5: SPI Cycle In Progress */
#define HSFS_SCIP		(0x1 << HSFS_SCIP_OFF)
					/* 6-12: reserved */
#define HSFS_FDOPSS_OFF		13	/* 13: Flash Descriptor Override Pin-Strap Status */
#define HSFS_FDOPSS		(0x1 << HSFS_FDOPSS_OFF)
#define HSFS_FDV_OFF		14	/* 14: Flash Descriptor Valid */
#define HSFS_FDV		(0x1 << HSFS_FDV_OFF)
#define HSFS_FLOCKDN_OFF	15	/* 15: Flash Configuration Lock-Down */
#define HSFS_FLOCKDN		(0x1 << HSFS_FLOCKDN_OFF)

#define ICH9_REG_HSFC		0x06	/* 16 Bits Hardware Sequencing Flash Control */

					/* 0: Flash Cycle Go */
					/* 1-2: FLASH Cycle */
#define ICH9_HSFC_FCYCLE_OFF		1
#define ICH9_HSFC_FCYCLE_BIT_WIDTH	3
#define ICH9_HSFC_FCYCLE	HSFC_FCYCLE_MASK(ICH9_HSFC_FCYCLE_BIT_WIDTH)
					/* 3-7: reserved */
#define HSFC_FDBC_OFF		8	/* 8-13: Flash Data Byte Count */
#define HSFC_FDBC		(0x3f << HSFC_FDBC_OFF)
#define HSFC_FDBC_VAL(n)	(((n) << HSFC_FDBC_OFF) & HSFC_FDBC)
					/* 14: reserved */
#define HSFC_SME_OFF		15	/* 15: SPI SMI# Enable */
#define HSFC_SME		(0x1 << HSFC_SME_OFF)

#define ICH9_REG_FADDR		0x08	/* 32 Bits */
#define ICH9_FADDR_FLA		0x01ffffff
#define ICH9_REG_FDATA0		0x10	/* 64 Bytes */

#define ICH_REG_BIOS_BM_RAP	0x118	/* 16 Bits BIOS Master Read Access Permissions */
#define ICH_REG_BIOS_BM_WAP	0x11c	/* 16 Bits BIOS Master Write Access Permissions */

#define ICH9_REG_FRAP		0x50	/* 32 Bytes Flash Region Access Permissions */
#define ICH9_REG_FREG0		0x54	/* 32 Bytes Flash Region 0 */

#define ICH9_REG_PR0		0x74	/* 32 Bytes Protected Range 0 */
#define PR_WP_OFF		31	/* 31: write protection enable */
#define PR_RP_OFF		15	/* 15: read protection enable */

#define ICH9_REG_SSFS		0x90	/* 08 Bits */
#define SSFS_SCIP_OFF		0	/* SPI Cycle In Progress */
#define SSFS_SCIP		(0x1 << SSFS_SCIP_OFF)
#define SSFS_FDONE_OFF		2	/* Cycle Done Status */
#define SSFS_FDONE		(0x1 << SSFS_FDONE_OFF)
#define SSFS_FCERR_OFF		3	/* Flash Cycle Error */
#define SSFS_FCERR		(0x1 << SSFS_FCERR_OFF)
#define SSFS_AEL_OFF		4	/* Access Error Log */
#define SSFS_AEL		(0x1 << SSFS_AEL_OFF)
/* The following bits are reserved in SSFS: 1,5-7. */
#define SSFS_RESERVED_MASK	0x000000e2

#define ICH9_REG_SSFC		0x91	/* 24 Bits */
/* We combine SSFS and SSFC to one 32-bit word,
 * therefore SSFC bits are off by 8. */
						/* 0: reserved */
#define SSFC_SCGO_OFF		(1 + 8)		/* 1: SPI Cycle Go */
#define SSFC_SCGO		(0x1 << SSFC_SCGO_OFF)
#define SSFC_ACS_OFF		(2 + 8)		/* 2: Atomic Cycle Sequence */
#define SSFC_ACS		(0x1 << SSFC_ACS_OFF)
#define SSFC_SPOP_OFF		(3 + 8)		/* 3: Sequence Prefix Opcode Pointer */
#define SSFC_SPOP		(0x1 << SSFC_SPOP_OFF)
#define SSFC_COP_OFF		(4 + 8)		/* 4-6: Cycle Opcode Pointer */
#define SSFC_COP		(0x7 << SSFC_COP_OFF)
						/* 7: reserved */
#define SSFC_DBC_OFF		(8 + 8)		/* 8-13: Data Byte Count */
#define SSFC_DBC		(0x3f << SSFC_DBC_OFF)
#define SSFC_DS_OFF		(14 + 8)	/* 14: Data Cycle */
#define SSFC_DS			(0x1 << SSFC_DS_OFF)
#define SSFC_SME_OFF		(15 + 8)	/* 15: SPI SMI# Enable */
#define SSFC_SME		(0x1 << SSFC_SME_OFF)
#define SSFC_SCF_OFF		(16 + 8)	/* 16-18: SPI Cycle Frequency */
#define SSFC_SCF		(0x7 << SSFC_SCF_OFF)
#define SSFC_SCF_20MHZ		0x00000000
#define SSFC_SCF_33MHZ		0x01000000
						/* 19-23: reserved */
#define SSFC_RESERVED_MASK	0xf8008100

#define ICH9_REG_PREOP		0x94	/* 16 Bits */
#define ICH9_REG_OPTYPE		0x96	/* 16 Bits */
#define ICH9_REG_OPMENU		0x98	/* 64 Bits */

#define ICH9_REG_BBAR		0xA0	/* 32 Bits BIOS Base Address Configuration */
#define BBAR_MASK	0x00ffff00		/* 8-23: Bottom of System Flash */

#define ICH8_REG_VSCC		0xC1	/* 32 Bits Vendor Specific Component Capabilities */
#define ICH9_REG_LVSCC		0xC4	/* 32 Bits Host Lower Vendor Specific Component Capabilities */
#define ICH9_REG_UVSCC		0xC8	/* 32 Bits Host Upper Vendor Specific Component Capabilities */
/* The individual fields of the VSCC registers are defined in the file
 * ich_descriptors.h. The reason is that the same layout is also used in the
 * flash descriptor to define the properties of the different flash chips
 * supported. The BIOS (or the ME?) is responsible to populate the ICH registers
 * with the information from the descriptor on startup depending on the actual
 * chip(s) detected. */

#define ICH9_REG_FPB		0xD0	/* 32 Bits Flash Partition Boundary */
#define FPB_FPBA_OFF		0	/* 0-12: Block/Sector Erase Size */
#define FPB_FPBA			(0x1FFF << FPB_FPBA_OFF)

// ICH9R SPI commands
#define SPI_OPCODE_TYPE_READ_NO_ADDRESS		0
#define SPI_OPCODE_TYPE_WRITE_NO_ADDRESS	1
#define SPI_OPCODE_TYPE_READ_WITH_ADDRESS	2
#define SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS	3

// ICH7 registers
#define ICH7_REG_SPIS		0x00	/* 16 Bits */
#define SPIS_SCIP		0x0001
#define SPIS_GRANT		0x0002
#define SPIS_CDS		0x0004
#define SPIS_FCERR		0x0008
#define SPIS_RESERVED_MASK	0x7ff0

/* VIA SPI is compatible with ICH7, but maxdata
   to transfer is 16 bytes.

   DATA byte count on ICH7 is 8:13, on VIA 8:11

   bit 12 is port select CS0 CS1
   bit 13 is FAST READ enable
   bit 7  is used with fast read and one shot controls CS de-assert?
*/

#define ICH7_REG_SPIC		0x02	/* 16 Bits */
#define SPIC_SCGO		0x0002
#define SPIC_ACS		0x0004
#define SPIC_SPOP		0x0008
#define SPIC_DS			0x4000

#define ICH7_REG_SPIA		0x04	/* 32 Bits */
#define ICH7_REG_SPID0		0x08	/* 64 Bytes */
#define ICH7_REG_PREOP		0x54	/* 16 Bits */
#define ICH7_REG_OPTYPE		0x56	/* 16 Bits */
#define ICH7_REG_OPMENU		0x58	/* 64 Bits */

enum ich_access_protection {
	NO_PROT		= 0,
	READ_PROT	= 1,
	WRITE_PROT	= 2,
	LOCKED		= 3,
};

/* ICH SPI configuration lock-down. May be set during chipset enabling. */
static bool ichspi_lock = false;

static enum ich_chipset ich_generation = CHIPSET_ICH_UNKNOWN;
static uint32_t ichspi_bbar;

static void *ich_spibar = NULL;

typedef struct _OPCODE {
	uint8_t opcode;		//This commands spi opcode
	uint8_t spi_type;	//This commands spi type
	uint8_t atomic;		//Use preop: (0: none, 1: preop0, 2: preop1
} OPCODE;

/* Suggested opcode definition:
 * Preop 1: Write Enable
 * Preop 2: Write Status register enable
 *
 * OP 0: Write address
 * OP 1: Read Address
 * OP 2: ERASE block
 * OP 3: Read Status register
 * OP 4: Read ID
 * OP 5: Write Status register
 * OP 6: chip private (read JEDEC id)
 * OP 7: Chip erase
 */
typedef struct _OPCODES {
	uint8_t preop[2];
	OPCODE opcode[8];
} OPCODES;

static OPCODES *curopcodes = NULL;

/* HW access functions */
static uint32_t REGREAD32(int X)
{
	return mmio_readl(ich_spibar + X);
}

static uint16_t REGREAD16(int X)
{
	return mmio_readw(ich_spibar + X);
}

static uint16_t REGREAD8(int X)
{
	return mmio_readb(ich_spibar + X);
}

#define REGWRITE32(off, val) mmio_writel(val, ich_spibar+(off))
#define REGWRITE16(off, val) mmio_writew(val, ich_spibar+(off))
#define REGWRITE8(off, val)  mmio_writeb(val, ich_spibar+(off))

/* Common SPI functions */

static int find_opcode(OPCODES *op, uint8_t opcode)
{
	int a;

	if (op == NULL) {
		msg_perr("\n%s: null OPCODES pointer!\n", __func__);
		return -1;
	}

	for (a = 0; a < 8; a++) {
		if (op->opcode[a].opcode == opcode)
			return a;
	}

	return -1;
}

static int find_preop(OPCODES *op, uint8_t preop)
{
	int a;

	if (op == NULL) {
		msg_perr("\n%s: null OPCODES pointer!\n", __func__);
		return -1;
	}

	for (a = 0; a < 2; a++) {
		if (op->preop[a] == preop)
			return a;
	}

	return -1;
}

/* for pairing opcodes with their required preop */
struct preop_opcode_pair {
	uint8_t preop;
	uint8_t opcode;
};

/* List of opcodes which need preopcodes and matching preopcodes. Unused. */
const struct preop_opcode_pair pops[] = {
	{JEDEC_WREN, JEDEC_BYTE_PROGRAM},
	{JEDEC_WREN, JEDEC_SE}, /* sector erase */
	{JEDEC_WREN, JEDEC_BE_52}, /* block erase */
	{JEDEC_WREN, JEDEC_BE_D8}, /* block erase */
	{JEDEC_WREN, JEDEC_CE_60}, /* chip erase */
	{JEDEC_WREN, JEDEC_CE_C7}, /* chip erase */
	 /* FIXME: WRSR requires either EWSR or WREN depending on chip type. */
	{JEDEC_WREN, JEDEC_WRSR},
	{JEDEC_EWSR, JEDEC_WRSR},
	{0,}
};

/* Reasonable default configuration. Needs ad-hoc modifications if we
 * encounter unlisted opcodes. Fun.
 */
static OPCODES O_ST_M25P = {
	{
	 JEDEC_WREN,
	 JEDEC_EWSR,
	},
	{
	 {JEDEC_BYTE_PROGRAM, SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS, 0},	// Write Byte
	 {JEDEC_READ, SPI_OPCODE_TYPE_READ_WITH_ADDRESS, 0},	// Read Data
	 {JEDEC_SE, SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS, 0},	// Erase Sector
	 {JEDEC_RDSR, SPI_OPCODE_TYPE_READ_NO_ADDRESS, 0},	// Read Device Status Reg
	 {JEDEC_REMS, SPI_OPCODE_TYPE_READ_WITH_ADDRESS, 0},	// Read Electronic Manufacturer Signature
	 {JEDEC_WRSR, SPI_OPCODE_TYPE_WRITE_NO_ADDRESS, 0},	// Write Status Register
	 {JEDEC_RDID, SPI_OPCODE_TYPE_READ_NO_ADDRESS, 0},	// Read JDEC ID
	 {JEDEC_CE_C7, SPI_OPCODE_TYPE_WRITE_NO_ADDRESS, 0},	// Bulk erase
	}
};

/* List of opcodes with their corresponding spi_type
 * It is used to reprogram the chipset OPCODE table on-the-fly if an opcode
 * is needed which is currently not in the chipset OPCODE table
 */
static const OPCODE POSSIBLE_OPCODES[] = {
	 {JEDEC_BYTE_PROGRAM, SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS, 0},	// Write Byte
	 {JEDEC_READ, SPI_OPCODE_TYPE_READ_WITH_ADDRESS, 0},	// Read Data
	 {JEDEC_BE_D8, SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS, 0},	// Erase Sector
	 {JEDEC_RDSR, SPI_OPCODE_TYPE_READ_NO_ADDRESS, 0},	// Read Device Status Reg
	 {JEDEC_REMS, SPI_OPCODE_TYPE_READ_WITH_ADDRESS, 0},	// Read Electronic Manufacturer Signature
	 {JEDEC_WRSR, SPI_OPCODE_TYPE_WRITE_NO_ADDRESS, 0},	// Write Status Register
	 {JEDEC_RDID, SPI_OPCODE_TYPE_READ_NO_ADDRESS, 0},	// Read JDEC ID
	 {JEDEC_CE_C7, SPI_OPCODE_TYPE_WRITE_NO_ADDRESS, 0},	// Bulk erase
	 {JEDEC_SE, SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS, 0},	// Sector erase
	 {JEDEC_BE_52, SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS, 0},	// Block erase
	 {JEDEC_AAI_WORD_PROGRAM, SPI_OPCODE_TYPE_WRITE_NO_ADDRESS, 0},	// Auto Address Increment
};

static OPCODES O_EXISTING = {};

/* pretty printing functions */
static void prettyprint_opcodes(OPCODES *ops)
{
	OPCODE oc;
	const char *t;
	const char *a;
	uint8_t i;
	static const char *const spi_type[4] = {
		"read  w/o addr",
		"write w/o addr",
		"read  w/  addr",
		"write w/  addr"
	};
	static const char *const atomic_type[3] = {
		"none",
		" 0  ",
		" 1  "
	};

	if (ops == NULL)
		return;

	msg_pdbg2("        OP        Type      Pre-OP\n");
	for (i = 0; i < 8; i++) {
		oc = ops->opcode[i];
		t = (oc.spi_type > 3) ? "invalid" : spi_type[oc.spi_type];
		a = (oc.atomic > 2) ? "invalid" : atomic_type[oc.atomic];
		msg_pdbg2("op[%d]: 0x%02x, %s, %s\n", i, oc.opcode, t, a);
	}
	msg_pdbg2("Pre-OP 0: 0x%02x, Pre-OP 1: 0x%02x\n", ops->preop[0],
		 ops->preop[1]);
}

#define pprint_reg16(reg, bit, val, sep) msg_pdbg("%s=%"PRId16"" sep, #bit, (val & reg##_##bit) >> reg##_##bit##_OFF)
#define pprint_reg32(reg, bit, val, sep) msg_pdbg("%s=%"PRId32"" sep, #bit, (val & reg##_##bit) >> reg##_##bit##_OFF)

static void prettyprint_ich9_reg_hsfs(uint16_t reg_val, enum ich_chipset ich_gen)
{
	msg_pdbg("HSFS: ");
	pprint_reg16(HSFS, FDONE, reg_val, ", ");
	pprint_reg16(HSFS, FCERR, reg_val, ", ");
	pprint_reg16(HSFS, AEL, reg_val, ", ");
	switch (ich_gen) {
	case CHIPSET_100_SERIES_SUNRISE_POINT:
	case CHIPSET_C620_SERIES_LEWISBURG:
	case CHIPSET_C740_SERIES_EMMITSBURG:
	case CHIPSET_300_SERIES_CANNON_POINT:
	case CHIPSET_400_SERIES_COMET_POINT:
	case CHIPSET_500_SERIES_TIGER_POINT:
	case CHIPSET_ELKHART_LAKE:
		break;
	default:
		pprint_reg16(HSFS, BERASE, reg_val, ", ");
		break;
	}
	pprint_reg16(HSFS, SCIP, reg_val, ", ");
	switch (ich_gen) {
	case CHIPSET_100_SERIES_SUNRISE_POINT:
	case CHIPSET_C620_SERIES_LEWISBURG:
	case CHIPSET_C740_SERIES_EMMITSBURG:
	case CHIPSET_300_SERIES_CANNON_POINT:
	case CHIPSET_400_SERIES_COMET_POINT:
	case CHIPSET_500_SERIES_TIGER_POINT:
	case CHIPSET_ELKHART_LAKE:
		pprint_reg16(HSFS, PRR34_LOCKDN, reg_val, ", ");
		pprint_reg16(HSFS, WRSDIS, reg_val, ", ");
		break;
	default:
		break;
	}
	pprint_reg16(HSFS, FDOPSS, reg_val, ", ");
	pprint_reg16(HSFS, FDV, reg_val, ", ");
	pprint_reg16(HSFS, FLOCKDN, reg_val, "\n");
}

static void prettyprint_ich9_reg_hsfc(uint16_t reg_val, enum ich_chipset ich_gen)
{
	msg_pdbg("HSFC: ");
	pprint_reg16(HSFC, FGO, reg_val, ", ");
	switch (ich_gen) {
	case CHIPSET_100_SERIES_SUNRISE_POINT:
	case CHIPSET_C620_SERIES_LEWISBURG:
	case CHIPSET_C740_SERIES_EMMITSBURG:
	case CHIPSET_300_SERIES_CANNON_POINT:
	case CHIPSET_400_SERIES_COMET_POINT:
	case CHIPSET_500_SERIES_TIGER_POINT:
	case CHIPSET_ELKHART_LAKE:
		pprint_reg16(PCH100_HSFC, FCYCLE, reg_val, ", ");
		pprint_reg16(PCH100_HSFC, WET, reg_val, ", ");
		break;
	default:
		pprint_reg16(ICH9_HSFC, FCYCLE, reg_val, ", ");
		break;
	}
	pprint_reg16(HSFC, FDBC, reg_val, ", ");
	pprint_reg16(HSFC, SME, reg_val, "\n");
}

static void prettyprint_ich9_reg_ssfs(uint32_t reg_val)
{
	msg_pdbg("SSFS: ");
	pprint_reg32(SSFS, SCIP, reg_val, ", ");
	pprint_reg32(SSFS, FDONE, reg_val, ", ");
	pprint_reg32(SSFS, FCERR, reg_val, ", ");
	pprint_reg32(SSFS, AEL, reg_val, "\n");
}

static void prettyprint_ich9_reg_ssfc(uint32_t reg_val)
{
	msg_pdbg("SSFC: ");
	pprint_reg32(SSFC, SCGO, reg_val, ", ");
	pprint_reg32(SSFC, ACS, reg_val, ", ");
	pprint_reg32(SSFC, SPOP, reg_val, ", ");
	pprint_reg32(SSFC, COP, reg_val, ", ");
	pprint_reg32(SSFC, DBC, reg_val, ", ");
	pprint_reg32(SSFC, SME, reg_val, ", ");
	pprint_reg32(SSFC, SCF, reg_val, "\n");
}

static void prettyprint_pch100_reg_dlock(const uint32_t reg_val)
{
	msg_pdbg("DLOCK: ");
	pprint_reg32(DLOCK, BMWAG_LOCKDN, reg_val, ", ");
	pprint_reg32(DLOCK, BMRAG_LOCKDN, reg_val, ", ");
	pprint_reg32(DLOCK, SBMWAG_LOCKDN, reg_val, ", ");
	pprint_reg32(DLOCK, SBMRAG_LOCKDN, reg_val, ",\n       ");
	pprint_reg32(DLOCK, PR0_LOCKDN, reg_val, ", ");
	pprint_reg32(DLOCK, PR1_LOCKDN, reg_val, ", ");
	pprint_reg32(DLOCK, PR2_LOCKDN, reg_val, ", ");
	pprint_reg32(DLOCK, PR3_LOCKDN, reg_val, ", ");
	pprint_reg32(DLOCK, PR4_LOCKDN, reg_val, ",\n       ");
	pprint_reg32(DLOCK, SSEQ_LOCKDN, reg_val, "\n");
}

static struct swseq_data {
	size_t reg_ssfsc;
	size_t reg_preop;
	size_t reg_optype;
	size_t reg_opmenu;
} swseq_data;

static uint8_t lookup_spi_type(uint8_t opcode)
{
	unsigned int a;

	for (a = 0; a < ARRAY_SIZE(POSSIBLE_OPCODES); a++) {
		if (POSSIBLE_OPCODES[a].opcode == opcode)
			return POSSIBLE_OPCODES[a].spi_type;
	}

	return 0xFF;
}

static int program_opcodes(OPCODES *op, int enable_undo, enum ich_chipset ich_gen)
{
	uint8_t a;
	uint16_t preop, optype;
	uint32_t opmenu[2];

	/* Program Prefix Opcodes */
	/* 0:7 Prefix Opcode 1 */
	preop = (op->preop[0]);
	/* 8:16 Prefix Opcode 2 */
	preop |= ((uint16_t) op->preop[1]) << 8;

	/* Program Opcode Types 0 - 7 */
	optype = 0;
	for (a = 0; a < 8; a++) {
		optype |= ((uint16_t) op->opcode[a].spi_type) << (a * 2);
	}

	/* Program Allowable Opcodes 0 - 3 */
	opmenu[0] = 0;
	for (a = 0; a < 4; a++) {
		opmenu[0] |= ((uint32_t) op->opcode[a].opcode) << (a * 8);
	}

	/* Program Allowable Opcodes 4 - 7 */
	opmenu[1] = 0;
	for (a = 4; a < 8; a++) {
		opmenu[1] |= ((uint32_t) op->opcode[a].opcode) << ((a - 4) * 8);
	}

	msg_pdbg2("\n%s: preop=%04x optype=%04x opmenu=%08"PRIx32"%08"PRIx32"\n", __func__, preop, optype, opmenu[0], opmenu[1]);
	switch (ich_gen) {
	case CHIPSET_ICH7:
	case CHIPSET_TUNNEL_CREEK:
	case CHIPSET_CENTERTON:
		/* Register undo only for enable_undo=1, i.e. first call. */
		if (enable_undo) {
			rmmio_valw(ich_spibar + ICH7_REG_PREOP);
			rmmio_valw(ich_spibar + ICH7_REG_OPTYPE);
			rmmio_vall(ich_spibar + ICH7_REG_OPMENU);
			rmmio_vall(ich_spibar + ICH7_REG_OPMENU + 4);
		}
		mmio_writew(preop, ich_spibar + ICH7_REG_PREOP);
		mmio_writew(optype, ich_spibar + ICH7_REG_OPTYPE);
		mmio_writel(opmenu[0], ich_spibar + ICH7_REG_OPMENU);
		mmio_writel(opmenu[1], ich_spibar + ICH7_REG_OPMENU + 4);
		break;
	case CHIPSET_ICH8:
	default:		/* Future version might behave the same */
		/* Register undo only for enable_undo=1, i.e. first call. */
		if (enable_undo) {
			rmmio_valw(ich_spibar + swseq_data.reg_preop);
			rmmio_valw(ich_spibar + swseq_data.reg_optype);
			rmmio_vall(ich_spibar + swseq_data.reg_opmenu);
			rmmio_vall(ich_spibar + swseq_data.reg_opmenu + 4);
		}
		mmio_writew(preop, ich_spibar + swseq_data.reg_preop);
		mmio_writew(optype, ich_spibar + swseq_data.reg_optype);
		mmio_writel(opmenu[0], ich_spibar + swseq_data.reg_opmenu);
		mmio_writel(opmenu[1], ich_spibar + swseq_data.reg_opmenu + 4);
		break;
	}

	return 0;
}

static int reprogram_opcode_on_the_fly(uint8_t opcode, unsigned int writecnt, unsigned int readcnt)
{
	uint8_t spi_type;

	spi_type = lookup_spi_type(opcode);
	if (spi_type > 3) {
		/* Try to guess spi type from read/write sizes.
		 * The following valid writecnt/readcnt combinations exist:
		 * writecnt  = 4, readcnt >= 0
		 * writecnt  = 1, readcnt >= 0
		 * writecnt >= 4, readcnt  = 0
		 * writecnt >= 1, readcnt  = 0
		 * writecnt >= 1 is guaranteed for all commands.
		 */
		if (readcnt == 0)
			/* if readcnt=0 and writecount >= 4, we don't know if it is WRITE_NO_ADDRESS
			 * or WRITE_WITH_ADDRESS. But if we use WRITE_NO_ADDRESS and the first 3 data
			 * bytes are actual the address, they go to the bus anyhow
			 */
			spi_type = SPI_OPCODE_TYPE_WRITE_NO_ADDRESS;
		else if (writecnt == 1) // and readcnt is > 0
			spi_type = SPI_OPCODE_TYPE_READ_NO_ADDRESS;
		else if (writecnt == 4) // and readcnt is > 0
			spi_type = SPI_OPCODE_TYPE_READ_WITH_ADDRESS;
		else // we have an invalid case
			return SPI_INVALID_LENGTH;
	}
	int oppos = 4;	// use the original position of JEDEC_REMS
	curopcodes->opcode[oppos].opcode = opcode;
	curopcodes->opcode[oppos].spi_type = spi_type;
	program_opcodes(curopcodes, 0, ich_generation);
	oppos = find_opcode(curopcodes, opcode);
	msg_pdbg2("on-the-fly OPCODE (0x%02X) re-programmed, op-pos=%d\n", opcode, oppos);
	return oppos;
}

/*
 * Returns -1 if at least one mandatory opcode is inaccessible, 0 otherwise.
 * FIXME: this should also check for
 *   - at least one probing opcode (RDID (incl. AT25F variants?), REMS, RES?)
 *   - at least one erasing opcode (lots.)
 *   - at least one program opcode (BYTE_PROGRAM, AAI_WORD_PROGRAM, ...?)
 *   - necessary preops? (EWSR, WREN, ...?)
 */
static int ich_missing_opcodes(void)
{
	uint8_t ops[] = {
		JEDEC_READ,
		JEDEC_RDSR,
		0
	};
	int i = 0;
	while (ops[i] != 0) {
		msg_pspew("checking for opcode 0x%02x\n", ops[i]);
		if (find_opcode(curopcodes, ops[i]) == -1)
			return -1;
		i++;
	}
	return 0;
}

/*
 * Try to set BBAR (BIOS Base Address Register), but read back the value in case
 * it didn't stick.
 */
static void ich_set_bbar(uint32_t min_addr, enum ich_chipset ich_gen)
{
	int bbar_off;
	switch (ich_gen) {
	case CHIPSET_ICH7:
	case CHIPSET_TUNNEL_CREEK:
	case CHIPSET_CENTERTON:
		bbar_off = 0x50;
		break;
	case CHIPSET_ICH8:
	case CHIPSET_BAYTRAIL:
		msg_pdbg("BBAR offset is unknown!\n");
		return;
	case CHIPSET_ICH9:
	default:		/* Future version might behave the same */
		bbar_off = ICH9_REG_BBAR;
		break;
	}

	ichspi_bbar = mmio_readl(ich_spibar + bbar_off) & ~BBAR_MASK;
	if (ichspi_bbar) {
		msg_pdbg("Reserved bits in BBAR not zero: 0x%08"PRIx32"\n",
			 ichspi_bbar);
	}
	min_addr &= BBAR_MASK;
	ichspi_bbar |= min_addr;
	rmmio_writel(ichspi_bbar, ich_spibar + bbar_off);
	ichspi_bbar = mmio_readl(ich_spibar + bbar_off) & BBAR_MASK;

	/* We don't have any option except complaining. And if the write
	 * failed, the restore will fail as well, so no problem there.
	 */
	if (ichspi_bbar != min_addr)
		msg_perr("Setting BBAR to 0x%08"PRIx32" failed! New value: 0x%08"PRIx32".\n",
			 min_addr, ichspi_bbar);
}

/* Create a struct OPCODES based on what we find in the locked down chipset. */
static int generate_opcodes(OPCODES * op, enum ich_chipset ich_gen)
{
	int a;
	uint16_t preop, optype;
	uint32_t opmenu[2];

	if (op == NULL) {
		msg_perr("\n%s: null OPCODES pointer!\n", __func__);
		return -1;
	}

	switch (ich_gen) {
	case CHIPSET_ICH7:
	case CHIPSET_TUNNEL_CREEK:
	case CHIPSET_CENTERTON:
		preop = REGREAD16(ICH7_REG_PREOP);
		optype = REGREAD16(ICH7_REG_OPTYPE);
		opmenu[0] = REGREAD32(ICH7_REG_OPMENU);
		opmenu[1] = REGREAD32(ICH7_REG_OPMENU + 4);
		break;
	case CHIPSET_ICH8:
	default:		/* Future version might behave the same */
		preop = REGREAD16(swseq_data.reg_preop);
		optype = REGREAD16(swseq_data.reg_optype);
		opmenu[0] = REGREAD32(swseq_data.reg_opmenu);
		opmenu[1] = REGREAD32(swseq_data.reg_opmenu + 4);
		break;
	}

	op->preop[0] = (uint8_t) preop;
	op->preop[1] = (uint8_t) (preop >> 8);

	for (a = 0; a < 8; a++) {
		op->opcode[a].spi_type = (uint8_t) (optype & 0x3);
		optype >>= 2;
	}

	for (a = 0; a < 4; a++) {
		op->opcode[a].opcode = (uint8_t) (opmenu[0] & 0xff);
		opmenu[0] >>= 8;
	}

	for (a = 4; a < 8; a++) {
		op->opcode[a].opcode = (uint8_t) (opmenu[1] & 0xff);
		opmenu[1] >>= 8;
	}

	/* No preopcodes used by default. */
	for (a = 0; a < 8; a++)
		op->opcode[a].atomic = 0;

	return 0;
}

/* This function generates OPCODES from or programs OPCODES to ICH according to
 * the chipset's SPI configuration lock.
 *
 * It should be called before ICH sends any spi command.
 */
static int ich_init_opcodes(enum ich_chipset ich_gen)
{
	int rc = 0;
	OPCODES *curopcodes_done;

	if (curopcodes)
		return 0;

	if (ichspi_lock) {
		msg_pdbg("Reading OPCODES... ");
		curopcodes_done = &O_EXISTING;
		rc = generate_opcodes(curopcodes_done, ich_gen);
	} else {
		msg_pdbg("Programming OPCODES... ");
		curopcodes_done = &O_ST_M25P;
		rc = program_opcodes(curopcodes_done, 1, ich_gen);
	}

	if (rc) {
		curopcodes = NULL;
		msg_perr("failed\n");
		return 1;
	} else {
		curopcodes = curopcodes_done;
		msg_pdbg("done\n");
		prettyprint_opcodes(curopcodes);
		return 0;
	}
}

/* Fill len bytes from the data array into the fdata/spid registers.
 *
 * Note that using len > flash->mst->spi.max_data_write will trash the registers
 * following the data registers.
 */
static void ich_fill_data(const uint8_t *data, int len, int reg0_off)
{
	uint32_t temp32 = 0;
	int i;

	if (len <= 0)
		return;

	for (i = 0; i < len; i++) {
		if ((i % 4) == 0)
			temp32 = 0;

		temp32 |= ((uint32_t) data[i]) << ((i % 4) * 8);

		if ((i % 4) == 3) /* 32 bits are full, write them to regs. */
			REGWRITE32(reg0_off + (i - (i % 4)), temp32);
	}
	i--;
	if ((i % 4) != 3) /* Write remaining data to regs. */
		REGWRITE32(reg0_off + (i - (i % 4)), temp32);
}

/* Read len bytes from the fdata/spid register into the data array.
 *
 * Note that using len > flash->mst->spi.max_data_read will return garbage or
 * may even crash.
 */
static void ich_read_data(uint8_t *data, int len, int reg0_off)
{
	int i;
	uint32_t temp32 = 0;

	for (i = 0; i < len; i++) {
		if ((i % 4) == 0)
			temp32 = REGREAD32(reg0_off + i);

		data[i] = (temp32 >> ((i % 4) * 8)) & 0xff;
	}
}

static int ich7_run_opcode(OPCODE op, uint32_t offset,
			   uint8_t datalength, uint8_t * data, int maxdata)
{
	bool write_cmd = false;
	int timeout;
	uint32_t temp32;
	uint16_t temp16;
	uint64_t opmenu;
	int opcode_index;

	/* Is it a write command? */
	if ((op.spi_type == SPI_OPCODE_TYPE_WRITE_NO_ADDRESS)
	    || (op.spi_type == SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS)) {
		write_cmd = true;
	}

	timeout = 100 * 60;	/* 60 ms are 9.6 million cycles at 16 MHz. */
	while ((REGREAD16(ICH7_REG_SPIS) & SPIS_SCIP) && --timeout) {
		default_delay(10);
	}
	if (!timeout) {
		msg_perr("Error: SCIP never cleared!\n");
		return 1;
	}

	/* Program offset in flash into SPIA while preserving reserved bits. */
	temp32 = REGREAD32(ICH7_REG_SPIA) & ~0x00FFFFFF;
	REGWRITE32(ICH7_REG_SPIA, (offset & 0x00FFFFFF) | temp32);

	/* Program data into SPID0 to N */
	if (write_cmd && (datalength != 0))
		ich_fill_data(data, datalength, ICH7_REG_SPID0);

	/* Assemble SPIS */
	temp16 = REGREAD16(ICH7_REG_SPIS);
	/* keep reserved bits */
	temp16 &= SPIS_RESERVED_MASK;
	/* clear error status registers */
	temp16 |= (SPIS_CDS | SPIS_FCERR);
	REGWRITE16(ICH7_REG_SPIS, temp16);

	/* Assemble SPIC */
	temp16 = 0;

	if (datalength != 0) {
		temp16 |= SPIC_DS;
		temp16 |= ((uint32_t) ((datalength - 1) & (maxdata - 1))) << 8;
	}

	/* Select opcode */
	opmenu = REGREAD32(ICH7_REG_OPMENU);
	opmenu |= ((uint64_t)REGREAD32(ICH7_REG_OPMENU + 4)) << 32;

	for (opcode_index = 0; opcode_index < 8; opcode_index++) {
		if ((opmenu & 0xff) == op.opcode) {
			break;
		}
		opmenu >>= 8;
	}
	if (opcode_index == 8) {
		msg_pdbg("Opcode %x not found.\n", op.opcode);
		return 1;
	}
	temp16 |= ((uint16_t) (opcode_index & 0x07)) << 4;

	timeout = 100 * 60;	/* 60 ms are 9.6 million cycles at 16 MHz. */
	/* Handle Atomic. Atomic commands include three steps:
	    - sending the preop (mainly EWSR or WREN)
	    - sending the main command
	    - waiting for the busy bit (WIP) to be cleared
	   This means the timeout must be sufficient for chip erase
	   of slow high-capacity chips.
	 */
	switch (op.atomic) {
	case 2:
		/* Select second preop. */
		temp16 |= SPIC_SPOP;
		/* Fall through. */
	case 1:
		/* Atomic command (preop+op) */
		temp16 |= SPIC_ACS;
		timeout = 100 * 1000 * 60;	/* 60 seconds */
		break;
	}

	/* Start */
	temp16 |= SPIC_SCGO;

	/* write it */
	REGWRITE16(ICH7_REG_SPIC, temp16);

	/* Wait for Cycle Done Status or Flash Cycle Error. */
	while (((REGREAD16(ICH7_REG_SPIS) & (SPIS_CDS | SPIS_FCERR)) == 0) &&
	       --timeout) {
		default_delay(10);
	}
	if (!timeout) {
		msg_perr("timeout, ICH7_REG_SPIS=0x%04x\n", REGREAD16(ICH7_REG_SPIS));
		return 1;
	}

	/* FIXME: make sure we do not needlessly cause transaction errors. */
	temp16 = REGREAD16(ICH7_REG_SPIS);
	if (temp16 & SPIS_FCERR) {
		msg_perr("Transaction error!\n");
		/* keep reserved bits */
		temp16 &= SPIS_RESERVED_MASK;
		REGWRITE16(ICH7_REG_SPIS, temp16 | SPIS_FCERR);
		return 1;
	}

	if ((!write_cmd) && (datalength != 0))
		ich_read_data(data, datalength, ICH7_REG_SPID0);

	return 0;
}

static int ich9_run_opcode(OPCODE op, uint32_t offset,
			   uint8_t datalength, uint8_t * data)
{
	bool write_cmd = false;
	int timeout;
	uint32_t temp32;
	uint64_t opmenu;
	int opcode_index;

	/* Is it a write command? */
	if ((op.spi_type == SPI_OPCODE_TYPE_WRITE_NO_ADDRESS)
	    || (op.spi_type == SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS)) {
		write_cmd = true;
	}

	timeout = 100 * 60;	/* 60 ms are 9.6 million cycles at 16 MHz. */
	while ((REGREAD8(swseq_data.reg_ssfsc) & SSFS_SCIP) && --timeout) {
		default_delay(10);
	}
	if (!timeout) {
		msg_perr("Error: SCIP never cleared!\n");
		return 1;
	}

	/* Program offset in flash into FADDR while preserve the reserved bits
	 * and clearing the 25. address bit which is only usable in hwseq. */
	temp32 = REGREAD32(ICH9_REG_FADDR) & ~0x01FFFFFF;
	REGWRITE32(ICH9_REG_FADDR, (offset & 0x00FFFFFF) | temp32);

	/* Program data into FDATA0 to N */
	if (write_cmd && (datalength != 0))
		ich_fill_data(data, datalength, ICH9_REG_FDATA0);

	/* Assemble SSFS + SSFC */
	temp32 = REGREAD32(swseq_data.reg_ssfsc);
	/* Keep reserved bits only */
	temp32 &= SSFS_RESERVED_MASK | SSFC_RESERVED_MASK;
	/* Clear cycle done and cycle error status registers */
	temp32 |= (SSFS_FDONE | SSFS_FCERR);
	REGWRITE32(swseq_data.reg_ssfsc, temp32);

	/* Use 20 MHz */
	temp32 |= SSFC_SCF_20MHZ;

	/* Set data byte count (DBC) and data cycle bit (DS) */
	if (datalength != 0) {
		uint32_t datatemp;
		temp32 |= SSFC_DS;
		datatemp = ((((uint32_t)datalength - 1) << SSFC_DBC_OFF) & SSFC_DBC);
		temp32 |= datatemp;
	}

	/* Select opcode */
	opmenu = REGREAD32(swseq_data.reg_opmenu);
	opmenu |= ((uint64_t)REGREAD32(swseq_data.reg_opmenu + 4)) << 32;

	for (opcode_index = 0; opcode_index < 8; opcode_index++) {
		if ((opmenu & 0xff) == op.opcode) {
			break;
		}
		opmenu >>= 8;
	}
	if (opcode_index == 8) {
		msg_pdbg("Opcode %x not found.\n", op.opcode);
		return 1;
	}
	temp32 |= ((uint32_t) (opcode_index & 0x07)) << (8 + 4);

	timeout = 100 * 60;	/* 60 ms are 9.6 million cycles at 16 MHz. */
	/* Handle Atomic. Atomic commands include three steps:
	    - sending the preop (mainly EWSR or WREN)
	    - sending the main command
	    - waiting for the busy bit (WIP) to be cleared
	   This means the timeout must be sufficient for chip erase
	   of slow high-capacity chips.
	 */
	switch (op.atomic) {
	case 2:
		/* Select second preop. */
		temp32 |= SSFC_SPOP;
		/* Fall through. */
	case 1:
		/* Atomic command (preop+op) */
		temp32 |= SSFC_ACS;
		timeout = 100 * 1000 * 60;	/* 60 seconds */
		break;
	}

	/* Start */
	temp32 |= SSFC_SCGO;

	/* write it */
	REGWRITE32(swseq_data.reg_ssfsc, temp32);

	/* Wait for Cycle Done Status or Flash Cycle Error. */
	while (((REGREAD32(swseq_data.reg_ssfsc) & (SSFS_FDONE | SSFS_FCERR)) == 0) &&
	       --timeout) {
		default_delay(10);
	}
	if (!timeout) {
		msg_perr("timeout, REG_SSFS=0x%08"PRIx32"\n", REGREAD32(swseq_data.reg_ssfsc));
		return 1;
	}

	/* FIXME make sure we do not needlessly cause transaction errors. */
	temp32 = REGREAD32(swseq_data.reg_ssfsc);
	if (temp32 & SSFS_FCERR) {
		msg_perr("Transaction error!\n");
		prettyprint_ich9_reg_ssfs(temp32);
		prettyprint_ich9_reg_ssfc(temp32);
		/* keep reserved bits */
		temp32 &= SSFS_RESERVED_MASK | SSFC_RESERVED_MASK;
		/* Clear the transaction error. */
		REGWRITE32(swseq_data.reg_ssfsc, temp32 | SSFS_FCERR);
		return 1;
	}

	if ((!write_cmd) && (datalength != 0))
		ich_read_data(data, datalength, ICH9_REG_FDATA0);

	return 0;
}

static int run_opcode(const struct flashctx *flash, OPCODE op, uint32_t offset,
		      uint8_t datalength, uint8_t * data)
{
	/* max_data_read == max_data_write for all Intel/VIA SPI masters */
	uint8_t maxlength = flash->mst->spi.max_data_read;

	if (ich_generation == CHIPSET_ICH_UNKNOWN) {
		msg_perr("%s: unsupported chipset\n", __func__);
		return -1;
	}

	if (datalength > maxlength) {
		msg_perr("%s: Internal command size error for "
			"opcode 0x%02x, got datalength=%i, want <=%i\n",
			__func__, op.opcode, datalength, maxlength);
		return SPI_INVALID_LENGTH;
	}

	switch (ich_generation) {
	case CHIPSET_ICH7:
	case CHIPSET_TUNNEL_CREEK:
	case CHIPSET_CENTERTON:
		return ich7_run_opcode(op, offset, datalength, data, maxlength);
	case CHIPSET_ICH8:
	default:		/* Future version might behave the same */
		return ich9_run_opcode(op, offset, datalength, data);
	}
}

static int ich_spi_send_command(const struct flashctx *flash, unsigned int writecnt,
				unsigned int readcnt,
				const unsigned char *writearr,
				unsigned char *readarr)
{
	int result;
	int opcode_index = -1;
	const unsigned char cmd = *writearr;
	OPCODE *opcode;
	uint32_t addr = 0;
	uint8_t *data;
	int count;

	/* find cmd in opcodes-table */
	opcode_index = find_opcode(curopcodes, cmd);
	if (opcode_index == -1) {
		if (!ichspi_lock)
			opcode_index = reprogram_opcode_on_the_fly(cmd, writecnt, readcnt);
		if (opcode_index == SPI_INVALID_LENGTH) {
			msg_pdbg("OPCODE 0x%02x has unsupported length, will not execute.\n", cmd);
			return SPI_INVALID_LENGTH;
		} else if (opcode_index == -1) {
			msg_pdbg("Invalid OPCODE 0x%02x, will not execute.\n", cmd);
			return SPI_INVALID_OPCODE;
		}
	}

	opcode = &(curopcodes->opcode[opcode_index]);

	/* The following valid writecnt/readcnt combinations exist:
	 * writecnt  = 4, readcnt >= 0
	 * writecnt  = 1, readcnt >= 0
	 * writecnt >= 4, readcnt  = 0
	 * writecnt >= 1, readcnt  = 0
	 * writecnt >= 1 is guaranteed for all commands.
	 */
	if ((opcode->spi_type == SPI_OPCODE_TYPE_READ_WITH_ADDRESS) &&
	    (writecnt != 4)) {
		msg_perr("%s: Internal command size error for opcode "
			"0x%02x, got writecnt=%i, want =4\n", __func__, cmd, writecnt);
		return SPI_INVALID_LENGTH;
	}
	if ((opcode->spi_type == SPI_OPCODE_TYPE_READ_NO_ADDRESS) &&
	    (writecnt != 1)) {
		msg_perr("%s: Internal command size error for opcode "
			"0x%02x, got writecnt=%i, want =1\n", __func__, cmd, writecnt);
		return SPI_INVALID_LENGTH;
	}
	if ((opcode->spi_type == SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS) &&
	    (writecnt < 4)) {
		msg_perr("%s: Internal command size error for opcode "
			"0x%02x, got writecnt=%i, want >=4\n", __func__, cmd, writecnt);
		return SPI_INVALID_LENGTH;
	}
	if (((opcode->spi_type == SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS) ||
	     (opcode->spi_type == SPI_OPCODE_TYPE_WRITE_NO_ADDRESS)) &&
	    (readcnt)) {
		msg_perr("%s: Internal command size error for opcode "
			"0x%02x, got readcnt=%i, want =0\n", __func__, cmd, readcnt);
		return SPI_INVALID_LENGTH;
	}

	/* Translate read/write array/count.
	 * The maximum data length is identical for the maximum read length and
	 * for the maximum write length excluding opcode and address. Opcode and
	 * address are stored in separate registers, not in the data registers
	 * and are thus not counted towards data length. The only exception
	 * applies if the opcode definition (un)intentionally classifies said
	 * opcode incorrectly as non-address opcode or vice versa. */
	if (opcode->spi_type == SPI_OPCODE_TYPE_WRITE_NO_ADDRESS) {
		data = (uint8_t *) (writearr + 1);
		count = writecnt - 1;
	} else if (opcode->spi_type == SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS) {
		data = (uint8_t *) (writearr + 4);
		count = writecnt - 4;
	} else {
		data = (uint8_t *) readarr;
		count = readcnt;
	}

	/* if opcode-type requires an address */
	if (cmd == JEDEC_REMS || cmd == JEDEC_RES) {
		addr = ichspi_bbar;
	} else if (opcode->spi_type == SPI_OPCODE_TYPE_READ_WITH_ADDRESS ||
	    opcode->spi_type == SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS) {
		/* BBAR may cut part of the chip off at the lower end. */
		const uint32_t valid_base = ichspi_bbar & ((flash->chip->total_size * 1024) - 1);
		const uint32_t addr_offset = ichspi_bbar - valid_base;
		/* Highest address we can program is (2^24 - 1). */
		const uint32_t valid_end = (1 << 24) - addr_offset;

		addr = writearr[1] << 16 | writearr[2] << 8 | writearr[3];
		const uint32_t addr_end = addr + count;

		if (addr < valid_base ||
		    addr_end < addr || /* integer overflow check */
		    addr_end > valid_end) {
			msg_perr("%s: Addressed region 0x%06"PRIx32"-0x%06"PRIx32" not in allowed range 0x%06"PRIx32"-0x%06"PRIx32"\n",
				 __func__, addr, addr_end - 1, valid_base, valid_end - 1);
			return SPI_INVALID_ADDRESS;
		}
		addr += addr_offset;
	}

	result = run_opcode(flash, *opcode, addr, count, data);
	if (result) {
		msg_pdbg("Running OPCODE 0x%02x failed ", opcode->opcode);
		if ((opcode->spi_type == SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS) ||
		    (opcode->spi_type == SPI_OPCODE_TYPE_READ_WITH_ADDRESS)) {
			msg_pdbg("at address 0x%06"PRIx32" ", addr);
		}
		msg_pdbg("(payload length was %d).\n", count);

		/* Print out the data array if it contains data to write.
		 * Errors are detected before the received data is read back into
		 * the array so it won't make sense to print it then. */
		if ((opcode->spi_type == SPI_OPCODE_TYPE_WRITE_WITH_ADDRESS) ||
		    (opcode->spi_type == SPI_OPCODE_TYPE_WRITE_NO_ADDRESS)) {
			int i;
			msg_pspew("The data was:\n");
			for (i = 0; i < count; i++){
				msg_pspew("%3d: 0x%02"PRIx8"\n", i, data[i]);
			}
		}
	}

	return result;
}

#define MAX_FD_REGIONS 16
struct fd_region {
	const char* name;
	enum ich_access_protection level;
	uint32_t base;
	uint32_t limit;
};

struct hwseq_data {
	uint32_t size_comp0;
	uint32_t size_comp1;
	uint32_t addr_mask;
	bool only_4k;
	uint32_t hsfc_fcycle;

	struct fd_region fd_regions[MAX_FD_REGIONS];
};

#define MAX_PR_REGISTERS 6
struct flash_region ranges_data[MAX_PR_REGISTERS];
struct protected_ranges ranges = {
	.count = 0,
	.ranges = ranges_data,
};

static struct hwseq_data *get_hwseq_data_from_context(const struct flashctx *flash)
{
	return flash->mst->opaque.data;
}

/* Sets FLA in FADDR to (addr & hwseq_data->addr_mask) without touching other bits. */
static void ich_hwseq_set_addr(uint32_t addr, uint32_t mask)
{
	uint32_t addr_old = REGREAD32(ICH9_REG_FADDR) & ~mask;
	REGWRITE32(ICH9_REG_FADDR, (addr & mask) | addr_old);
}

/* Sets FADDR.FLA to 'addr' and returns the erase block size in bytes
 * of the block containing this address. May return nonsense if the address is
 * not valid. The erase block size for a specific address depends on the flash
 * partition layout as specified by FPB and the partition properties as defined
 * by UVSCC and LVSCC respectively. An alternative to implement this method
 * would be by querying FPB and the respective VSCC register directly.
 */
static uint32_t ich_hwseq_get_erase_block_size(unsigned int addr, uint32_t addr_mask, bool only_4k)
{
	uint8_t enc_berase;
	static const uint32_t dec_berase[4] = {
		256,
		4 * 1024,
		8 * 1024,
		64 * 1024
	};

	if (only_4k) {
		return 4 * 1024;
	}

	ich_hwseq_set_addr(addr, addr_mask);
	enc_berase = (REGREAD16(ICH9_REG_HSFS) & HSFS_BERASE) >> HSFS_BERASE_OFF;
	return dec_berase[enc_berase];
}

/* Polls for Cycle Done Status, Flash Cycle Error or timeout in 8 us intervals.
   Resets all error flags in HSFS.
   Returns 0 if the cycle completes successfully without errors within
   timeout us, 1 on errors. */
static int ich_hwseq_wait_for_cycle_complete(unsigned int len, enum ich_chipset ich_gen, uint32_t addr_mask)
{
	/*
	 * The SPI bus may be busy due to performing operations from other masters, hence
	 * introduce the long timeout of 30s to cover the worst case scenarios as well.
	 */
	unsigned int timeout_us = 30 * 1000 * 1000;
	uint16_t hsfs;
	uint32_t addr;

	timeout_us /= 8; /* scale timeout duration to counter */
	while ((((hsfs = REGREAD16(ICH9_REG_HSFS)) &
		 (HSFS_FDONE | HSFS_FCERR)) == 0) &&
	       --timeout_us) {
		default_delay(8);
	}
	REGWRITE16(ICH9_REG_HSFS, REGREAD16(ICH9_REG_HSFS));
	if (!timeout_us) {
		addr = REGREAD32(ICH9_REG_FADDR) & addr_mask;
		msg_perr("Timeout error between offset 0x%08"PRIx32" and "
			 "0x%08"PRIx32" (= 0x%08"PRIx32" + %d)!\n",
			 addr, addr + len - 1, addr, len - 1);
		prettyprint_ich9_reg_hsfs(hsfs, ich_gen);
		prettyprint_ich9_reg_hsfc(REGREAD16(ICH9_REG_HSFC), ich_gen);
		return 1;
	}

	if (hsfs & HSFS_FCERR) {
		addr = REGREAD32(ICH9_REG_FADDR) & addr_mask;
		msg_perr("Transaction error between offset 0x%08"PRIx32" and "
			 "0x%08"PRIx32" (= 0x%08"PRIx32" + %d)!\n",
			 addr, addr + len - 1, addr, len - 1);
		prettyprint_ich9_reg_hsfs(hsfs, ich_gen);
		prettyprint_ich9_reg_hsfc(REGREAD16(ICH9_REG_HSFC), ich_gen);
		return 1;
	}
	return 0;
}

/* Fire up a transfer using the hardware sequencer. */
static void ich_start_hwseq_xfer(const struct flashctx *flash,
		uint32_t hsfc_cycle, uint32_t flash_addr, size_t len,
		uint32_t addr_mask)
{
	/* make sure HSFC register is cleared before initiate any operation */
	uint16_t hsfc = 0;

	/* Sets flash_addr in FADDR */
	ich_hwseq_set_addr(flash_addr, addr_mask);

	/* make sure FDONE, FCERR, AEL are cleared by writing 1 to them */
	REGWRITE16(ICH9_REG_HSFS, REGREAD16(ICH9_REG_HSFS));

	/* Set up transaction parameters. */
	hsfc |= hsfc_cycle;
	/*
	 * The number of bytes transferred is the value of `FDBC` plus 1, hence,
	 * subtracted 1 from the length field.
	 * As per Intel EDS, `0b` in the FDBC represents 1 byte while `0x3f`
	 * represents 64-bytes to be transferred.
	 */
	hsfc |= HSFC_FDBC_VAL(len - 1);
	hsfc |= HSFC_FGO; /* start */
	prettyprint_ich9_reg_hsfc(hsfc, ich_generation);
	REGWRITE16(ICH9_REG_HSFC, hsfc);
}

static int ich_wait_for_hwseq_spi_cycle_complete(void)
{
	if (REGREAD8(ICH9_REG_HSFS) & HSFS_SCIP) {
		msg_perr("Error: SCIP bit is unexpectedly set.\n");
		return 1;
	}
	return 0;
}

/* Execute SPI flash transfer */
static int ich_exec_sync_hwseq_xfer(const struct flashctx *flash, uint32_t hsfc_cycle, uint32_t flash_addr,
				size_t len, enum ich_chipset ich_gen, uint32_t addr_mask)
{
	if (ich_wait_for_hwseq_spi_cycle_complete()) {
		msg_perr("SPI Transaction Timeout due to previous operation in process!\n");
		return 1;
	}

	ich_start_hwseq_xfer(flash, hsfc_cycle, flash_addr, len, addr_mask);
	return ich_hwseq_wait_for_cycle_complete(len, ich_gen, addr_mask);
}

static void ich_get_region(const struct flashctx *flash, unsigned int addr, struct flash_region *region)
{
	struct ich_descriptors desc = { 0 };
	const ssize_t nr = ich_number_of_regions(ich_generation, &desc.content);
	const struct hwseq_data *hwseq_data = get_hwseq_data_from_context(flash);
	const struct fd_region *fd_regions = hwseq_data->fd_regions;

	/*
	 * Set default values for the region. If no flash descriptor containing
	 * addr is found, these values will be used instead.
	 *
	 * The region start and end are constrained so that they do not overlap
	 * any flash descriptor regions.
	 */
	const char *name = "";
	region->read_prot  = false;
	region->write_prot = false;
	region->start = 0;
	region->end = flashrom_flash_getsize(flash) - 1;

	for (ssize_t i = 0; i < nr; i++) {
		uint32_t base = fd_regions[i].base;
		uint32_t limit = fd_regions[i].limit;
		enum ich_access_protection level = fd_regions[i].level;

		if (addr < base) {
			/*
			 * fd_regions[i] starts after addr, constrain
			 * region->end so that it does not overlap.
			 */
			region->end = min(region->end, base);
		} else if (addr > limit) {
			/*
			 * fd_regions[i] ends before addr, constrain
			 * region->start so that it does not overlap.
			 */
			region->start = max(region->start, limit + 1);
		} else {
			/* fd_regions[i] contains addr, copy to *region. */
			name = fd_regions[i].name;
			region->start = base;
			region->end = limit;
			region->read_prot  = (level == LOCKED) || (level == READ_PROT);
			region->write_prot = (level == LOCKED) || (level == WRITE_PROT);
			break;
		}
	}

	region->name = strdup(name);
}

static void ich_get_protected_ranges(struct protected_ranges *protected_ranges) {
	protected_ranges->count = ranges.count;
	protected_ranges->ranges = malloc(sizeof(*ranges.ranges) * ranges.count);
	for (int i = 0; i < ranges.count; ++i) {
		if (ranges.ranges[i].name == NULL)
			protected_ranges->ranges[i].name = strdup("");
		else
			protected_ranges->ranges[i].name = strdup(ranges.ranges[i].name);
		protected_ranges->ranges[i].start = ranges.ranges[i].start;
		protected_ranges->ranges[i].end = ranges.ranges[i].end;
		protected_ranges->ranges[i].read_prot = ranges.ranges[i].read_prot;
		protected_ranges->ranges[i].write_prot = ranges.ranges[i].write_prot;
	}
}

/* Given RDID info, return pointer to entry in flashchips[] */
static const struct flashchip *flash_id_to_entry(uint32_t mfg_id, uint32_t model_id)
{
	const struct flashchip *chip;

	for (chip = &flashchips[0]; chip->vendor; chip++) {
		if ((chip->manufacture_id == mfg_id) &&
		    (chip->model_id == model_id) &&
		    (chip->probe == PROBE_SPI_RDID) &&
		    ((chip->bustype & BUS_SPI) == BUS_SPI))
			return chip;
	}

	return NULL;
}

static int ich_hwseq_read_status(const struct flashctx *flash, enum flash_reg reg, uint8_t *value)
{
	const int len = 1;
	const struct hwseq_data *hwseq_data = get_hwseq_data_from_context(flash);

	if (reg != STATUS1) {
		msg_pdbg("%s: only supports STATUS1\n", __func__);
		/*
		 * Return SPI_INVALID_OPCODE to be consistent with spi_read_register()
		 * and make error handling simpler even though this isn't a SPI master.
		 */
		return SPI_INVALID_OPCODE;
	}
	msg_pdbg("Reading Status register\n");

	if (ich_exec_sync_hwseq_xfer(flash, HSFC_CYCLE_RD_STATUS, 1, len, ich_generation,
		hwseq_data->addr_mask)) {
		msg_perr("Reading Status register failed\n!!");
		return -1;
	}
	ich_read_data(value, len, ICH9_REG_FDATA0);

	return 0;
}

static int ich_hwseq_write_status(const struct flashctx *flash, enum flash_reg reg, uint8_t value)
{
	const int len = 1;
	const struct hwseq_data *hwseq_data = get_hwseq_data_from_context(flash);

	if (reg != STATUS1) {
		msg_pdbg("%s: only supports STATUS1\n", __func__);
		/*
		 * Return SPI_INVALID_OPCODE to be consistent with spi_write_register()
		 * and make error handling simpler even though this isn't a SPI master.
		 */
		return SPI_INVALID_OPCODE;
	}
	msg_pdbg("Writing status register\n");

	ich_fill_data(&value, len, ICH9_REG_FDATA0);

	if (ich_exec_sync_hwseq_xfer(flash, HSFC_CYCLE_WR_STATUS, 1, len, ich_generation,
		hwseq_data->addr_mask)) {
		msg_perr("Writing Status register failed\n!!");
		return -1;
	}

	return 0;
}

static void ich_hwseq_get_flash_id(struct flashctx *flash, enum ich_chipset ich_gen)
{
	const struct hwseq_data *hwseq_data = get_hwseq_data_from_context(flash);
	if (hwseq_data->size_comp1 != 0) {
		msg_pinfo("Multiple flash components detected, skipping flash identification.\n");
		return;
	}

	/* PCH100 or above is required for RDID, ICH9 does not support it. */
	if (hwseq_data->hsfc_fcycle != PCH100_HSFC_FCYCLE) {
		msg_pinfo("RDID cycle not supported, skipping flash identification.\n");
		return;
	}

	/*
	 * RDID gives 3 byte output:
	 *     Byte 0: Manufacturer ID
	 *     Byte 1: Model ID (MSB)
	 *     Byte 2: Model ID (LSB)
	 */
	const int len = 3;
	uint8_t data[len];

	if (ich_exec_sync_hwseq_xfer(flash, HSFC_CYCLE_RDID, 1, len, ich_gen,
		hwseq_data->addr_mask)) {
		msg_perr("Timed out waiting for RDID to complete.\n");
	}

	ich_read_data(data, len, ICH9_REG_FDATA0);
	uint32_t mfg_id = data[0];
	uint32_t model_id = (data[1] << 8) | data[2];

	const struct flashchip *entry = flash_id_to_entry(mfg_id, model_id);
	if (!entry) {
		msg_pwarn("Unable to identify chip, mfg_id: 0x%02"PRIx32", "
				"model_id: 0x%02"PRIx32"\n", mfg_id, model_id);
		return;
	}

	msg_pdbg("Chip identified: %s\n", entry->name);

	/* Update informational flash chip entries only */
	flash->chip->vendor = entry->vendor;
	flash->chip->name = entry->name;
	flash->chip->manufacture_id = entry->manufacture_id;
	flash->chip->model_id = entry->model_id;
	/* total_size read from flash descriptor */
	flash->chip->page_size = entry->page_size;
	flash->chip->feature_bits = entry->feature_bits;
	flash->chip->tested = entry->tested;
	/* Support writeprotect */
	flash->chip->reg_bits = entry->reg_bits;
	flash->chip->decode_range = entry->decode_range;
}

static int ich_hwseq_probe(struct flashctx *flash)
{
	uint32_t total_size, boundary;
	uint32_t erase_size_low, size_low, erase_size_high, size_high;
	struct block_eraser *eraser;
	const struct hwseq_data *hwseq_data = get_hwseq_data_from_context(flash);

	total_size = hwseq_data->size_comp0 + hwseq_data->size_comp1;
	msg_cdbg("Hardware sequencing reports %d attached SPI flash chip",
		 (hwseq_data->size_comp1 != 0) ? 2 : 1);
	if (hwseq_data->size_comp1 != 0)
		msg_cdbg("s with a combined");
	else
		msg_cdbg(" with a");
	msg_cdbg(" density of %"PRId32" kB.\n", total_size / 1024);
	flash->chip->total_size = total_size / 1024;

	eraser = &(flash->chip->block_erasers[0]);
	if (!hwseq_data->only_4k)
		boundary = (REGREAD32(ICH9_REG_FPB) & FPB_FPBA) << 12;
	else
		boundary = 0;
	size_high = total_size - boundary;
	erase_size_high = ich_hwseq_get_erase_block_size(boundary, hwseq_data->addr_mask, hwseq_data->only_4k);

	if (boundary == 0) {
		msg_cdbg2("There is only one partition containing the whole "
			 "address space (0x%06x - 0x%06"PRIx32").\n", 0, size_high-1);
		eraser->eraseblocks[0].size = erase_size_high;
		eraser->eraseblocks[0].count = size_high / erase_size_high;
		msg_cdbg2("There are %"PRId32" erase blocks with %"PRId32" B each.\n",
			 size_high / erase_size_high, erase_size_high);
	} else {
		msg_cdbg2("The flash address space (0x%06x - 0x%06"PRIx32") is divided "
			 "at address 0x%06"PRIx32" in two partitions.\n",
			 0, total_size-1, boundary);
		size_low = total_size - size_high;
		erase_size_low = ich_hwseq_get_erase_block_size(0, hwseq_data->addr_mask, hwseq_data->only_4k);

		eraser->eraseblocks[0].size = erase_size_low;
		eraser->eraseblocks[0].count = size_low / erase_size_low;
		msg_cdbg("The first partition ranges from 0x%06x to 0x%06"PRIx32".\n", 0, size_low-1);
		msg_cdbg("In that range are %"PRId32" erase blocks with %"PRId32" B each.\n",
			 size_low / erase_size_low, erase_size_low);

		eraser->eraseblocks[1].size = erase_size_high;
		eraser->eraseblocks[1].count = size_high / erase_size_high;
		msg_cdbg("The second partition ranges from 0x%06"PRIx32" to 0x%06"PRIx32".\n",
			 boundary, total_size-1);
		msg_cdbg("In that range are %"PRId32" erase blocks with %"PRId32" B each.\n",
			 size_high / erase_size_high, erase_size_high);
	}

	/* May be overwritten by ich_hwseq_get_flash_id(). */
	flash->chip->tested = TEST_OK_PREWB;

	ich_hwseq_get_flash_id(flash, ich_generation);

	return 1;
}

static int ich_hwseq_block_erase(struct flashctx *flash, unsigned int addr,
				 unsigned int len)
{
	uint32_t erase_block;
	const struct hwseq_data *hwseq_data = get_hwseq_data_from_context(flash);

	erase_block = ich_hwseq_get_erase_block_size(addr, hwseq_data->addr_mask, hwseq_data->only_4k);
	if (len != erase_block) {
		msg_cerr("Erase block size for address 0x%06x is %"PRId32" B, "
			 "but requested erase block size is %d B. "
			 "Not erasing anything.\n", addr, erase_block, len);
		return -1;
	}

	/* Although the hardware supports this (it would erase the whole block
	 * containing the address) we play safe here. */
	if (addr % erase_block != 0) {
		msg_cerr("Erase address 0x%06x is not aligned to the erase "
			 "block boundary (any multiple of %"PRId32"). "
			 "Not erasing anything.\n", addr, erase_block);
		return -1;
	}

	if (addr + len > flash->chip->total_size * 1024) {
		msg_perr("Request to erase some inaccessible memory address(es)"
			 " (addr=0x%x, len=%d). Not erasing anything.\n", addr, len);
		return -1;
	}

	msg_pdbg("Erasing %d bytes starting at 0x%06x.\n", len, addr);

	if (ich_exec_sync_hwseq_xfer(flash, HSFC_CYCLE_BLOCK_ERASE, addr, 1, ich_generation,
		hwseq_data->addr_mask))
		return -1;
	return 0;
}

static int ich_hwseq_read(struct flashctx *flash, uint8_t *buf,
			  unsigned int addr, unsigned int len)
{
	uint8_t block_len;
	const struct hwseq_data *hwseq_data = get_hwseq_data_from_context(flash);

	if (addr + len > flash->chip->total_size * 1024) {
		msg_perr("Request to read from an inaccessible memory address "
			 "(addr=0x%x, len=%d).\n", addr, len);
		return -1;
	}

	msg_pdbg("Reading %d bytes starting at 0x%06x.\n", len, addr);
	/* clear FDONE, FCERR, AEL by writing 1 to them (if they are set) */
	REGWRITE16(ICH9_REG_HSFS, REGREAD16(ICH9_REG_HSFS));

	while (len > 0) {
		/* Obey programmer limit... */
		block_len = min(len, flash->mst->opaque.max_data_read);
		/* as well as flash chip page borders as demanded in the Intel datasheets. */
		block_len = min(block_len, 256 - (addr & 0xFF));

		if (ich_exec_sync_hwseq_xfer(flash, HSFC_CYCLE_READ, addr, block_len, ich_generation,
			hwseq_data->addr_mask))
			return 1;
		ich_read_data(buf, block_len, ICH9_REG_FDATA0);
		addr += block_len;
		buf += block_len;
		len -= block_len;
	}
	return 0;
}

static int ich_hwseq_write(struct flashctx *flash, const uint8_t *buf, unsigned int addr, unsigned int len)
{
	uint8_t block_len;
	const struct hwseq_data *hwseq_data = get_hwseq_data_from_context(flash);

	if (addr + len > flash->chip->total_size * 1024) {
		msg_perr("Request to write to an inaccessible memory address "
			 "(addr=0x%x, len=%d).\n", addr, len);
		return -1;
	}

	msg_pdbg("Writing %d bytes starting at 0x%06x.\n", len, addr);
	/* clear FDONE, FCERR, AEL by writing 1 to them (if they are set) */
	REGWRITE16(ICH9_REG_HSFS, REGREAD16(ICH9_REG_HSFS));

	while (len > 0) {
		/* Obey programmer limit... */
		block_len = min(len, flash->mst->opaque.max_data_write);
		/* as well as flash chip page borders as demanded in the Intel datasheets. */
		block_len = min(block_len, 256 - (addr & 0xFF));
		ich_fill_data(buf, block_len, ICH9_REG_FDATA0);

		if (ich_exec_sync_hwseq_xfer(flash, HSFC_CYCLE_WRITE, addr, block_len, ich_generation,
			hwseq_data->addr_mask))
			return -1;
		addr += block_len;
		buf += block_len;
		len -= block_len;
	}
	return 0;
}

static int ich_hwseq_shutdown(void *data)
{
	free(data);
	return 0;
}

static int ich_spi_send_multicommand(const struct flashctx *flash,
				     struct spi_command *cmds)
{
	int ret = 0;
	int i;
	int oppos, preoppos;
	for (; (cmds->writecnt || cmds->readcnt) && !ret; cmds++) {
		if ((cmds + 1)->writecnt || (cmds + 1)->readcnt) {
			/* Next command is valid. */
			preoppos = find_preop(curopcodes, cmds->writearr[0]);
			oppos = find_opcode(curopcodes, (cmds + 1)->writearr[0]);
			if ((oppos == -1) && (preoppos != -1)) {
				/* Current command is listed as preopcode in
				 * ICH struct OPCODES, but next command is not
				 * listed as opcode in that struct.
				 * Check for command sanity, then
				 * try to reprogram the ICH opcode list.
				 */
				if (find_preop(curopcodes,
					       (cmds + 1)->writearr[0]) != -1) {
					msg_perr("%s: Two subsequent "
						"preopcodes 0x%02x and 0x%02x, "
						"ignoring the first.\n",
						__func__, cmds->writearr[0],
						(cmds + 1)->writearr[0]);
					continue;
				}
				/* If the chipset is locked down, we'll fail
				 * during execution of the next command anyway.
				 * No need to bother with fixups.
				 */
				if (!ichspi_lock) {
					oppos = reprogram_opcode_on_the_fly((cmds + 1)->writearr[0], (cmds + 1)->writecnt, (cmds + 1)->readcnt);
					if (oppos == -1)
						continue;
					curopcodes->opcode[oppos].atomic = preoppos + 1;
					continue;
				}
			}
			if ((oppos != -1) && (preoppos != -1)) {
				/* Current command is listed as preopcode in
				 * ICH struct OPCODES and next command is listed
				 * as opcode in that struct. Match them up.
				 */
				curopcodes->opcode[oppos].atomic = preoppos + 1;
				continue;
			}
			/* If none of the above if-statements about oppos or
			 * preoppos matched, this is a normal opcode.
			 */
		}
		ret = ich_spi_send_command(flash, cmds->writecnt, cmds->readcnt,
					   cmds->writearr, cmds->readarr);
		/* Reset the type of all opcodes to non-atomic. */
		for (i = 0; i < 8; i++)
			curopcodes->opcode[i].atomic = 0;
	}
	return ret;
}

static bool ich_spi_probe_opcode(const struct flashctx *flash, uint8_t opcode)
{
	int ret = find_opcode(curopcodes, opcode);
	if ((ret == -1) && (lookup_spi_type(opcode) <= 3) && (!ichspi_lock))
		/* opcode is in POSSIBLE_OPCODES, report supported.
		 * Relying on reprogramming on-the-fly
		 * when opcode is not in curopcodes, but is in POSSIBLE_OPCODES.
		 *
		 * on-the-fly does not work for locked chipsets, therefore checking ichspi_lock. */
		return true;
	return ret >= 0;
}

#define ICH_BMWAG(x) ((x >> 24) & 0xff)
#define ICH_BMRAG(x) ((x >> 16) & 0xff)
#define ICH_BRWA(x)  ((x >>  8) & 0xff)
#define ICH_BRRA(x)  ((x >>  0) & 0xff)

static const enum ich_access_protection access_perms_to_protection[] = {
	LOCKED, WRITE_PROT, READ_PROT, NO_PROT
};
static const char *const access_names[] = {
	"read-write", "write-only", "read-only", "locked"
};

static void ich_get_bios_region_access(uint16_t *region_read_access,
				       uint16_t *region_write_access)
{
	uint32_t tmp;
	*region_read_access = 0;
	*region_write_access = 0;

	if (ich_generation >= CHIPSET_METEOR_LAKE) {
		/*
		 * Starting from Meteor Lake, we need to fetch the region
		 * read/write access permissions from the BIOS_BM registers
		 * because we need to support FREG9 or above.
		 */
		*region_read_access = mmio_readw(ich_spibar + ICH_REG_BIOS_BM_RAP);
		*region_write_access = mmio_readw(ich_spibar + ICH_REG_BIOS_BM_WAP);
		msg_pdbg("0x118: 0x%04"PRIx16" (BIOS_BM_RAP)\n", *region_read_access);
		msg_pdbg("0x11a: 0x%04"PRIx16" (BIOS_BM_WAP)\n", *region_write_access);
	} else {
		/*
		 * FRAP - Flash Regions Access Permissions Register
		 * Bit Descriptions:
		 * 31:24 BIOS Master Write Access Grant (BMWAG)
		 * 23:16 BIOS Master Read Access Grant (BMRAG)
		 * 15:8 BIOS Region Write Access (BRWA)
		 * 7:0 BIOS Region Read Access (BRRA)
		 */
		tmp = mmio_readl(ich_spibar + ICH9_REG_FRAP);
		msg_pdbg("0x50: 0x%08"PRIx32" (FRAP)\n", tmp);
		msg_pdbg("BMWAG 0x%02"PRIx32", ", ICH_BMWAG(tmp));
		msg_pdbg("BMRAG 0x%02"PRIx32", ", ICH_BMRAG(tmp));
		msg_pdbg("BRWA 0x%02"PRIx32", ", ICH_BRWA(tmp));
		msg_pdbg("BRRA 0x%02"PRIx32"\n", ICH_BRRA(tmp));

		*region_read_access = (uint16_t)ICH_BRRA(tmp);
		*region_write_access = (uint16_t)ICH_BRWA(tmp);
	}
}

static unsigned int ich_get_defined_region_count(void) {
	return (ich_generation >= CHIPSET_METEOR_LAKE) ? 16 : 8;
}

static enum ich_access_protection ich9_handle_region_access(struct fd_region *fd_regions,
							    uint16_t region_read_access,
							    uint16_t region_write_access,
							    unsigned int i)
{
	static const char *const region_names[] = {
		"Flash Descriptor", "BIOS", "Management Engine",
		"Gigabit Ethernet", "Platform Data", "Device Expansion",
		"BIOS2", "unknown", "EC/BMC", "Device Expansion 2",
		"Innovation Engine", "10GbE0", "10GbE1", "unknown", "unknown", "PTT",
	};
	const char *const region_name = i < ARRAY_SIZE(region_names) ? region_names[i] : "unknown";

	uint32_t base, limit;
	unsigned int rwperms_idx;
	enum ich_access_protection rwperms;
	const int offset = i < 12
		? ICH9_REG_FREG0 + i * 4
		: APL_REG_FREG12 + (i - 12) * 4;
	uint32_t freg = mmio_readl(ich_spibar + offset);

	base  = ICH_FREG_BASE(freg);
	limit = ICH_FREG_LIMIT(freg);
	if (base > limit || (freg == 0 && i > 0)) {
		/* this FREG is disabled */
		msg_pdbg2("0x%02X: 0x%08"PRIx32" FREG%u: %s region is unused.\n",
			  offset, freg, i, region_name);
		return NO_PROT;
	}
	msg_pdbg("0x%02X: 0x%08"PRIx32" ", offset, freg);

	if (i < ich_get_defined_region_count()) {
		rwperms_idx = (((region_write_access >> i) & 1) << 1) |
			      (((region_read_access >> i) & 1) << 0);
		rwperms = access_perms_to_protection[rwperms_idx];
	} else {
		/* Datasheets might not define all the access bits for regions. We
		   can't rely on the actual descriptor settings either as there
		   are several overrides for them (those by other masters are
		   not even readable by us, *shrug*). */
		msg_pdbg("FREG%u: %s region (0x%08"PRIx32"-0x%08"PRIx32") has unknown permissions.\n",
				i, region_name, base, limit);
		return NO_PROT;
	}
	msg_pinfo("FREG%u: %s region (0x%08"PRIx32"-0x%08"PRIx32") is %s.\n", i,
		  region_name, base, limit, access_names[rwperms]);

	/* Save region attributes for use by ich_get_region(). */
	fd_regions[i].base = base;
	fd_regions[i].limit = limit;
	fd_regions[i].level = rwperms;
	fd_regions[i].name = region_name;

	return rwperms;
}

	/* In contrast to FRAP and the master section of the descriptor the bits
	 * in the PR registers have an inverted meaning. The bits in FRAP
	 * indicate read and write access _grant_. Here they indicate read
	 * and write _protection_ respectively. If both bits are 0 the address
	 * bits are ignored.
	 */
#define ICH_PR_PERMS(pr)	(((~((pr) >> PR_RP_OFF) & 1) << 0) | \
				 ((~((pr) >> PR_WP_OFF) & 1) << 1))

static enum ich_access_protection ich9_handle_pr(const size_t reg_pr0, unsigned int i, struct flash_region *prot)
{
	uint8_t off = reg_pr0 + (i * 4);
	uint32_t pr = mmio_readl(ich_spibar + off);
	unsigned int rwperms_idx = ICH_PR_PERMS(pr);
	enum ich_access_protection rwperms = access_perms_to_protection[rwperms_idx];

	prot->name = NULL;
	prot->start = ICH_FREG_BASE(pr);
	prot->end = ICH_FREG_LIMIT(pr);
	prot->write_prot = (rwperms == WRITE_PROT) || (rwperms == LOCKED);
	prot->read_prot = (rwperms == READ_PROT) || (rwperms == LOCKED);

	/* From 5 on we have GPR registers and start from 0 again. */
	const char *const prefix = i >= 5 ? "G" : "";
	if (i >= 5)
		i -= 5;

	if (rwperms == NO_PROT) {
		msg_pdbg2("0x%02"PRIX8": 0x%08"PRIx32" (%sPR%u is unused)\n", off, pr, prefix, i);
		return NO_PROT;
	}

	msg_pdbg("0x%02"PRIX8": 0x%08"PRIx32" ", off, pr);
	msg_pwarn("%sPR%u: Warning: 0x%08"PRIx32"-0x%08"PRIx32" is %s.\n", prefix, i, ICH_FREG_BASE(pr),
		  ICH_FREG_LIMIT(pr), access_names[rwperms]);

	return rwperms;
}

/* Set/Clear the read and write protection enable bits of PR register @i
 * according to @read_prot and @write_prot. */
static void ich9_set_pr(const size_t reg_pr0, int i, int read_prot, int write_prot)
{
	void *addr = ich_spibar + reg_pr0 + (i * 4);
	uint32_t old = mmio_readl(addr);
	uint32_t new;

	msg_gspew("PR%u is 0x%08"PRIx32"", i, old);
	new = old & ~((1 << PR_RP_OFF) | (1 << PR_WP_OFF));
	if (read_prot)
		new |= (1 << PR_RP_OFF);
	if (write_prot)
		new |= (1 << PR_WP_OFF);
	if (old == new) {
		msg_gspew(" already.\n");
		return;
	}
	msg_gspew(", trying to set it to 0x%08"PRIx32" ", new);
	rmmio_writel(new, addr);
	msg_gspew("resulted in 0x%08"PRIx32".\n", mmio_readl(addr));
}

static const struct spi_master spi_master_ich = {
	.max_data_read	= 64,
	.max_data_write	= 64,
	.command	= ich_spi_send_command,
	.multicommand	= ich_spi_send_multicommand,
	.map_flash_region	= physmap,
	.unmap_flash_region	= physunmap,
	.read		= default_spi_read,
	.write_256	= default_spi_write_256,
	.probe_opcode	= ich_spi_probe_opcode,
};

static const struct opaque_master opaque_master_ich_hwseq = {
	.max_data_read		= 64,
	.max_data_write		= 64,
	.probe			= ich_hwseq_probe,
	.read			= ich_hwseq_read,
	.write			= ich_hwseq_write,
	.erase			= ich_hwseq_block_erase,
	.read_register		= ich_hwseq_read_status,
	.write_register		= ich_hwseq_write_status,
	.get_region		= ich_get_region,
	.get_protected_ranges	= ich_get_protected_ranges,
	.shutdown		= ich_hwseq_shutdown,
};

static int init_ich7_spi(void *spibar, enum ich_chipset ich_gen)
{
	unsigned int i;

	msg_pdbg("0x00: 0x%04"PRIx16"     (SPIS)\n",	mmio_readw(spibar + 0));
	msg_pdbg("0x02: 0x%04"PRIx16"     (SPIC)\n",	mmio_readw(spibar + 2));
	msg_pdbg("0x04: 0x%08"PRIx32" (SPIA)\n",	mmio_readl(spibar + 4));

	ichspi_bbar = mmio_readl(spibar + 0x50);

	msg_pdbg("0x50: 0x%08"PRIx32" (BBAR)\n",	ichspi_bbar);
	msg_pdbg("0x54: 0x%04"PRIx16"     (PREOP)\n",	mmio_readw(spibar + 0x54));
	msg_pdbg("0x56: 0x%04"PRIx16"     (OPTYPE)\n",	mmio_readw(spibar + 0x56));
	msg_pdbg("0x58: 0x%08"PRIx32" (OPMENU)\n",	mmio_readl(spibar + 0x58));
	msg_pdbg("0x5c: 0x%08"PRIx32" (OPMENU+4)\n",	mmio_readl(spibar + 0x5c));

	for (i = 0; i < 3; i++) {
		int offs;
		offs = 0x60 + (i * 4);
		msg_pdbg("0x%02x: 0x%08"PRIx32" (PBR%u)\n", offs, mmio_readl(spibar + offs), i);
	}
	if (mmio_readw(spibar) & (1 << 15)) {
		msg_pwarn("WARNING: SPI Configuration Lockdown activated.\n");
		ichspi_lock = true;
	}
	ich_init_opcodes(ich_gen);
	ich_set_bbar(0, ich_gen);
	register_spi_master(&spi_master_ich, NULL);

	return 0;
}

enum ich_spi_mode {
	ich_auto,
	ich_hwseq,
	ich_swseq
};

static int get_ich_spi_mode_param(const struct programmer_cfg *cfg, enum ich_spi_mode *ich_spi_mode)
{
	char *const arg = extract_programmer_param_str(cfg, "ich_spi_mode");
	if (!arg) {
		return 0;
	} else if (!strcmp(arg, "hwseq")) {
		*ich_spi_mode = ich_hwseq;
		msg_pspew("user selected hwseq\n");
	} else if (!strcmp(arg, "swseq")) {
		*ich_spi_mode = ich_swseq;
		msg_pspew("user selected swseq\n");
	} else if (!strcmp(arg, "auto")) {
		msg_pspew("user selected auto\n");
		*ich_spi_mode = ich_auto;
	} else if (!strlen(arg)) {
		msg_perr("Missing argument for ich_spi_mode.\n");
		free(arg);
		return ERROR_FLASHROM_FATAL;
	} else {
		msg_perr("Unknown argument for ich_spi_mode: %s\n", arg);
		free(arg);
		return ERROR_FLASHROM_FATAL;
	}
	free(arg);

	return 0;
}

static void init_chipset_properties(struct swseq_data *swseq, struct hwseq_data *hwseq,
					size_t *num_freg, size_t *num_pr, size_t *reg_pr0,
					enum ich_chipset ich_gen)
{
	/* Moving registers / bits */
	switch (ich_gen) {
	case CHIPSET_100_SERIES_SUNRISE_POINT:
	case CHIPSET_C620_SERIES_LEWISBURG:
	case CHIPSET_C740_SERIES_EMMITSBURG:
	case CHIPSET_300_SERIES_CANNON_POINT:
	case CHIPSET_400_SERIES_COMET_POINT:
	case CHIPSET_500_SERIES_TIGER_POINT:
	case CHIPSET_600_SERIES_ALDER_POINT:
	case CHIPSET_700_SERIES_RAPTOR_POINT:
	case CHIPSET_APOLLO_LAKE:
	case CHIPSET_GEMINI_LAKE:
	case CHIPSET_JASPER_LAKE:
	case CHIPSET_ELKHART_LAKE:
	case CHIPSET_METEOR_LAKE:
	case CHIPSET_PANTHER_LAKE:
	case CHIPSET_WILDCAT_LAKE:
		*num_pr			= 6;	/* Includes GPR0 */
		*reg_pr0		= PCH100_REG_FPR0;
		swseq->reg_ssfsc	= PCH100_REG_SSFSC;
		swseq->reg_preop	= PCH100_REG_PREOP;
		swseq->reg_optype	= PCH100_REG_OPTYPE;
		swseq->reg_opmenu	= PCH100_REG_OPMENU;
		hwseq->addr_mask	= PCH100_FADDR_FLA;
		hwseq->only_4k		= true;
		hwseq->hsfc_fcycle	= PCH100_HSFC_FCYCLE;
		break;
	default:
		*num_pr			= 5;
		*reg_pr0		= ICH9_REG_PR0;
		swseq->reg_ssfsc	= ICH9_REG_SSFS;
		swseq->reg_preop	= ICH9_REG_PREOP;
		swseq->reg_optype	= ICH9_REG_OPTYPE;
		swseq->reg_opmenu	= ICH9_REG_OPMENU;
		hwseq->addr_mask	= ICH9_FADDR_FLA;
		hwseq->only_4k		= false;
		hwseq->hsfc_fcycle	= ICH9_HSFC_FCYCLE;
		break;
	}

	switch (ich_gen) {
	case CHIPSET_100_SERIES_SUNRISE_POINT:
		*num_freg = 10;
		break;
	case CHIPSET_C620_SERIES_LEWISBURG:
	case CHIPSET_C740_SERIES_EMMITSBURG:
		*num_freg = 12;	/* 12 MMIO regs, but 16 regions in FD spec */
		break;
	case CHIPSET_300_SERIES_CANNON_POINT:
	case CHIPSET_400_SERIES_COMET_POINT:
	case CHIPSET_500_SERIES_TIGER_POINT:
	case CHIPSET_600_SERIES_ALDER_POINT:
	case CHIPSET_700_SERIES_RAPTOR_POINT:
	case CHIPSET_APOLLO_LAKE:
	case CHIPSET_GEMINI_LAKE:
	case CHIPSET_JASPER_LAKE:
	case CHIPSET_ELKHART_LAKE:
	case CHIPSET_METEOR_LAKE:
	case CHIPSET_PANTHER_LAKE:
	case CHIPSET_WILDCAT_LAKE:
		*num_freg = 16;
		break;
	default:
		*num_freg = 5;
		break;
	}
}

static int init_ich_default(const struct programmer_cfg *cfg, void *spibar, enum ich_chipset ich_gen)
{
	unsigned int i;
	uint16_t tmp2;
	uint32_t tmp;
	int ich_spi_rw_restricted = 0;
	bool desc_valid = false;
	struct ich_descriptors desc = { 0 };
	enum ich_spi_mode ich_spi_mode = ich_auto;
	size_t num_freg, num_pr, reg_pr0;
	struct hwseq_data hwseq_data = { 0 };
	init_chipset_properties(&swseq_data, &hwseq_data, &num_freg, &num_pr, &reg_pr0, ich_gen);

	int ret = get_ich_spi_mode_param(cfg, &ich_spi_mode);
	if (ret)
		return ret;

	tmp2 = mmio_readw(spibar + ICH9_REG_HSFS);
	msg_pdbg("0x04: 0x%04x (HSFS)\n", tmp2);
	prettyprint_ich9_reg_hsfs(tmp2, ich_gen);
	if (tmp2 & HSFS_FLOCKDN) {
		msg_pinfo("SPI Configuration is locked down.\n");
		ichspi_lock = true;
	}
	if (tmp2 & HSFS_FDV)
		desc_valid = true;
	if (!(tmp2 & HSFS_FDOPSS) && desc_valid)
		msg_pinfo("The Flash Descriptor Override Strap-Pin is set. Restrictions implied by\n"
			  "the Master Section of the flash descriptor are NOT in effect. Please note\n"
			  "that Protected Range (PR) restrictions still apply.\n");
	ich_init_opcodes(ich_gen);

	if (desc_valid) {
		tmp2 = mmio_readw(spibar + ICH9_REG_HSFC);
		msg_pdbg("0x06: 0x%04"PRIx16" (HSFC)\n", tmp2);
		prettyprint_ich9_reg_hsfc(tmp2, ich_gen);
	}

	tmp = mmio_readl(spibar + ICH9_REG_FADDR);
	msg_pdbg2("0x08: 0x%08"PRIx32" (FADDR)\n", tmp);

	switch (ich_gen) {
	case CHIPSET_100_SERIES_SUNRISE_POINT:
	case CHIPSET_C620_SERIES_LEWISBURG:
	case CHIPSET_C740_SERIES_EMMITSBURG:
	case CHIPSET_300_SERIES_CANNON_POINT:
	case CHIPSET_400_SERIES_COMET_POINT:
	case CHIPSET_500_SERIES_TIGER_POINT:
	case CHIPSET_600_SERIES_ALDER_POINT:
	case CHIPSET_700_SERIES_RAPTOR_POINT:
	case CHIPSET_APOLLO_LAKE:
	case CHIPSET_GEMINI_LAKE:
	case CHIPSET_JASPER_LAKE:
	case CHIPSET_ELKHART_LAKE:
	case CHIPSET_METEOR_LAKE:
	case CHIPSET_PANTHER_LAKE:
	case CHIPSET_WILDCAT_LAKE:
		tmp = mmio_readl(spibar + PCH100_REG_DLOCK);
		msg_pdbg("0x0c: 0x%08"PRIx32" (DLOCK)\n", tmp);
		prettyprint_pch100_reg_dlock(tmp);
		break;
	default:
		break;
	}

	if (desc_valid) {
		/* Get the region access data from FRAP/BIOS_BM */
		uint16_t region_read_access, region_write_access;
		ich_get_bios_region_access(&region_read_access, &region_write_access);

		/* Handle FREGx and region access registers */
		for (i = 0; i < num_freg; i++)
			ich_spi_rw_restricted |= ich9_handle_region_access(hwseq_data.fd_regions,
									   region_read_access,
									   region_write_access, i);
		if (ich_spi_rw_restricted)
			msg_pinfo("Not all flash regions are freely accessible by flashrom. This is "
				  "most likely\ndue to an active ME. Please see "
				  "https://flashrom.org/user_docs/management_engine.html for details.\n");
	}

	/* Handle PR registers */
	for (i = 0; i < num_pr; i++) {
		/* if not locked down try to disable PR locks first */
		if (!ichspi_lock)
			ich9_set_pr(reg_pr0, i, 0, 0);
		struct flash_region pr_region = { 0 };
		enum ich_access_protection rwperms = ich9_handle_pr(reg_pr0, i, &pr_region);
		ich_spi_rw_restricted |= rwperms;
		if (rwperms != NO_PROT) {
			ranges_data[ranges.count] = pr_region;
			ranges.count += 1;
		}
	}

	switch (ich_spi_rw_restricted) {
	case WRITE_PROT:
		msg_pwarn("At least some flash regions are write protected. For write operations,\n"
			  "you should use a flash layout and include only writable regions. See\n"
			  "manpage for more details.\n");
		break;
	case READ_PROT:
	case LOCKED:
		msg_pwarn("At least some flash regions are read protected. You have to use a flash\n"
			  "layout and include only accessible regions. For write operations, you'll\n"
			  "additionally need the --noverify-all switch. See manpage for more details.\n");
		break;
	}

	tmp = mmio_readl(spibar + swseq_data.reg_ssfsc);
	msg_pdbg("0x%zx: 0x%02"PRIx32" (SSFS)\n", swseq_data.reg_ssfsc, tmp & 0xff);
	prettyprint_ich9_reg_ssfs(tmp);
	if (tmp & SSFS_FCERR) {
		msg_pdbg("Clearing SSFS.FCERR\n");
		mmio_writeb(SSFS_FCERR, spibar + swseq_data.reg_ssfsc);
	}
	msg_pdbg("0x%zx: 0x%06"PRIx32" (SSFC)\n", swseq_data.reg_ssfsc + 1, tmp >> 8);
	prettyprint_ich9_reg_ssfc(tmp);

	msg_pdbg("0x%zx: 0x%04"PRIx16" (PREOP)\n",
		 swseq_data.reg_preop, mmio_readw(spibar + swseq_data.reg_preop));
	msg_pdbg("0x%zx: 0x%04"PRIx16" (OPTYPE)\n",
		 swseq_data.reg_optype, mmio_readw(spibar + swseq_data.reg_optype));
	msg_pdbg("0x%zx: 0x%08"PRIx32" (OPMENU)\n",
		 swseq_data.reg_opmenu, mmio_readl(spibar + swseq_data.reg_opmenu));
	msg_pdbg("0x%zx: 0x%08"PRIx32" (OPMENU+4)\n",
		 swseq_data.reg_opmenu + 4, mmio_readl(spibar + swseq_data.reg_opmenu + 4));

	if (desc_valid) {
		switch (ich_gen) {
		case CHIPSET_ICH8:
		case CHIPSET_100_SERIES_SUNRISE_POINT:
		case CHIPSET_C620_SERIES_LEWISBURG:
		case CHIPSET_C740_SERIES_EMMITSBURG:
		case CHIPSET_300_SERIES_CANNON_POINT:
		case CHIPSET_400_SERIES_COMET_POINT:
		case CHIPSET_500_SERIES_TIGER_POINT:
		case CHIPSET_600_SERIES_ALDER_POINT:
		case CHIPSET_700_SERIES_RAPTOR_POINT:
		case CHIPSET_APOLLO_LAKE:
		case CHIPSET_GEMINI_LAKE:
		case CHIPSET_JASPER_LAKE:
		case CHIPSET_BAYTRAIL:
		case CHIPSET_ELKHART_LAKE:
		case CHIPSET_METEOR_LAKE:
		case CHIPSET_PANTHER_LAKE:
		case CHIPSET_WILDCAT_LAKE:
			break;
		default:
			ichspi_bbar = mmio_readl(spibar + ICH9_REG_BBAR);
			msg_pdbg("0x%x: 0x%08"PRIx32" (BBAR)\n", ICH9_REG_BBAR, ichspi_bbar);
			ich_set_bbar(0, ich_gen);
			break;
		}

		if (ich_gen == CHIPSET_ICH8) {
			tmp = mmio_readl(spibar + ICH8_REG_VSCC);
			msg_pdbg("0x%x: 0x%08"PRIx32" (VSCC)\n", ICH8_REG_VSCC, tmp);
			msg_pdbg("VSCC: ");
			prettyprint_ich_reg_vscc(tmp, FLASHROM_MSG_DEBUG, true);
		} else {
			tmp = mmio_readl(spibar + ICH9_REG_LVSCC);
			msg_pdbg("0x%x: 0x%08"PRIx32" (LVSCC)\n", ICH9_REG_LVSCC, tmp);
			msg_pdbg("LVSCC: ");
			prettyprint_ich_reg_vscc(tmp, FLASHROM_MSG_DEBUG, true);

			tmp = mmio_readl(spibar + ICH9_REG_UVSCC);
			msg_pdbg("0x%x: 0x%08"PRIx32" (UVSCC)\n", ICH9_REG_UVSCC, tmp);
			msg_pdbg("UVSCC: ");
			prettyprint_ich_reg_vscc(tmp, FLASHROM_MSG_DEBUG, false);
		}

		switch (ich_gen) {
		case CHIPSET_ICH8:
		case CHIPSET_100_SERIES_SUNRISE_POINT:
		case CHIPSET_C620_SERIES_LEWISBURG:
		case CHIPSET_C740_SERIES_EMMITSBURG:
		case CHIPSET_300_SERIES_CANNON_POINT:
		case CHIPSET_400_SERIES_COMET_POINT:
		case CHIPSET_500_SERIES_TIGER_POINT:
		case CHIPSET_600_SERIES_ALDER_POINT:
		case CHIPSET_700_SERIES_RAPTOR_POINT:
		case CHIPSET_APOLLO_LAKE:
		case CHIPSET_GEMINI_LAKE:
		case CHIPSET_JASPER_LAKE:
		case CHIPSET_ELKHART_LAKE:
		case CHIPSET_METEOR_LAKE:
		case CHIPSET_PANTHER_LAKE:
		case CHIPSET_WILDCAT_LAKE:
			break;
		default:
			tmp = mmio_readl(spibar + ICH9_REG_FPB);
			msg_pdbg("0x%x: 0x%08"PRIx32" (FPB)\n", ICH9_REG_FPB, tmp);
			break;
		}

		if (read_ich_descriptors_via_fdo(ich_gen, spibar, &desc) == ICH_RET_OK)
			prettyprint_ich_descriptors(ich_gen, &desc);

		/* If the descriptor is valid and indicates multiple
		 * flash devices we need to use hwseq to be able to
		 * access the second flash device.
		 */
		if (ich_spi_mode == ich_auto && desc.content.NC != 0) {
			msg_pinfo("Enabling hardware sequencing due to multiple flash chips detected.\n");
			ich_spi_mode = ich_hwseq;
		}
	}

	if (ich_spi_mode == ich_auto && ichspi_lock &&
	    ich_missing_opcodes()) {
		msg_pinfo("Enabling hardware sequencing because "
			  "some important opcode is locked.\n");
		ich_spi_mode = ich_hwseq;
	}

	if (ich_spi_mode == ich_auto &&
	    (ich_gen == CHIPSET_100_SERIES_SUNRISE_POINT ||
	     ich_gen == CHIPSET_300_SERIES_CANNON_POINT ||
	     ich_gen == CHIPSET_400_SERIES_COMET_POINT ||
	     ich_gen == CHIPSET_500_SERIES_TIGER_POINT ||
	     ich_gen == CHIPSET_600_SERIES_ALDER_POINT ||
	     ich_gen == CHIPSET_700_SERIES_RAPTOR_POINT ||
	     ich_gen == CHIPSET_C740_SERIES_EMMITSBURG)) {
		msg_pdbg("Enabling hardware sequencing by default for 100+ series PCH.\n");
		ich_spi_mode = ich_hwseq;
	}

	if (ich_spi_mode == ich_auto &&
	    (ich_gen == CHIPSET_APOLLO_LAKE ||
	     ich_gen == CHIPSET_GEMINI_LAKE ||
	     ich_gen == CHIPSET_JASPER_LAKE ||
	     ich_gen == CHIPSET_ELKHART_LAKE ||
	     ich_gen == CHIPSET_METEOR_LAKE ||
	     ich_gen == CHIPSET_PANTHER_LAKE ||
	     ich_gen == CHIPSET_WILDCAT_LAKE)) {
		msg_pdbg("Enabling hardware sequencing by default for Apollo/Gemini/Jasper/Elkhart/Meteor/Panther Lake/Wildcat Lake.\n");
		ich_spi_mode = ich_hwseq;
	}

	if (ich_spi_mode == ich_hwseq) {
		if (!desc_valid) {
			msg_perr("Hardware sequencing was requested "
				 "but the flash descriptor is not valid. Aborting.\n");
			return ERROR_FLASHROM_FATAL;
		}

		int tmpi = getFCBA_component_density(ich_gen, &desc, 0);
		if (tmpi < 0) {
			msg_perr("Could not determine density of flash component %d.\n", 0);
			return ERROR_FLASHROM_FATAL;
		}
		hwseq_data.size_comp0 = tmpi;

		tmpi = getFCBA_component_density(ich_gen, &desc, 1);
		if (tmpi < 0) {
			msg_perr("Could not determine density of flash component %d.\n", 1);
			return ERROR_FLASHROM_FATAL;
		}
		hwseq_data.size_comp1 = tmpi;

		struct hwseq_data *opaque_hwseq_data = calloc(1, sizeof(struct hwseq_data));
		if (!opaque_hwseq_data)
			return ERROR_FLASHROM_FATAL;
		memcpy(opaque_hwseq_data, &hwseq_data, sizeof(*opaque_hwseq_data));
		register_opaque_master(&opaque_master_ich_hwseq, opaque_hwseq_data);
	} else {
		register_spi_master(&spi_master_ich, NULL);
	}

	return 0;
}

int ich_init_spi(const struct programmer_cfg *cfg, void *spibar, enum ich_chipset ich_gen)
{
	ich_generation = ich_gen;
	ich_spibar = spibar;

	switch (ich_gen) {
	case CHIPSET_ICH7:
	case CHIPSET_TUNNEL_CREEK:
	case CHIPSET_CENTERTON:
		return init_ich7_spi(spibar, ich_gen);
	case CHIPSET_ICH8:
	default:	/* Future version might behave the same */
		return init_ich_default(cfg, spibar, ich_gen);
	}
}

static const struct spi_master spi_master_via = {
	.max_data_read	= 16,
	.max_data_write	= 16,
	.command	= ich_spi_send_command,
	.multicommand	= ich_spi_send_multicommand,
	.map_flash_region	= physmap,
	.unmap_flash_region	= physunmap,
	.read		= default_spi_read,
	.write_256	= default_spi_write_256,
	.probe_opcode	= ich_spi_probe_opcode,
};

int via_init_spi(uint32_t mmio_base)
{
	int i;

	ich_spibar = rphysmap("VIA SPI MMIO registers", mmio_base, 0x70);
	if (ich_spibar == ERROR_PTR)
		return ERROR_FLASHROM_FATAL;
	/* Do we really need no write enable? Like the LPC one at D17F0 0x40 */

	/* Not sure if it speaks all these bus protocols. */
	internal_buses_supported &= BUS_LPC | BUS_FWH;
	ich_generation = CHIPSET_ICH7;
	register_spi_master(&spi_master_via, NULL);

	msg_pdbg("0x00: 0x%04"PRIx16" (SPIS)\n",	mmio_readw(ich_spibar + 0));
	msg_pdbg("0x02: 0x%04"PRIx16" (SPIC)\n",	mmio_readw(ich_spibar + 2));
	msg_pdbg("0x04: 0x%08"PRIx32" (SPIA)\n",	mmio_readl(ich_spibar + 4));
	for (i = 0; i < 2; i++) {
		int offs;
		offs = 8 + (i * 8);
		msg_pdbg("0x%02x: 0x%08"PRIx32" (SPID%d)\n", offs, mmio_readl(ich_spibar + offs), i);
		msg_pdbg("0x%02x: 0x%08"PRIx32" (SPID%d+4)\n", offs + 4,
			 mmio_readl(ich_spibar + offs + 4), i);
	}
	ichspi_bbar = mmio_readl(ich_spibar + 0x50);

	msg_pdbg("0x50: 0x%08"PRIx32" (BBAR)\n",	ichspi_bbar);
	msg_pdbg("0x54: 0x%04"PRIx16" (PREOP)\n",	mmio_readw(ich_spibar + 0x54));
	msg_pdbg("0x56: 0x%04"PRIx16" (OPTYPE)\n",	mmio_readw(ich_spibar + 0x56));
	msg_pdbg("0x58: 0x%08"PRIx32" (OPMENU)\n",	mmio_readl(ich_spibar + 0x58));
	msg_pdbg("0x5c: 0x%08"PRIx32" (OPMENU+4)\n",	mmio_readl(ich_spibar + 0x5c));
	for (i = 0; i < 3; i++) {
		int offs;
		offs = 0x60 + (i * 4);
		msg_pdbg("0x%02x: 0x%08"PRIx32" (PBR%d)\n", offs, mmio_readl(ich_spibar + offs), i);
	}
	msg_pdbg("0x6c: 0x%04x     (CLOCK/DEBUG)\n", mmio_readw(ich_spibar + 0x6c));
	if (mmio_readw(ich_spibar) & (1 << 15)) {
		msg_pwarn("Warning: SPI Configuration Lockdown activated.\n");
		ichspi_lock = true;
	}

	ich_set_bbar(0, ich_generation);
	ich_init_opcodes(ich_generation);

	return 0;
}
