/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (c) 2022, Linaro Ltd.
 *
 */

#ifndef _MHI_COMMON_H
#define _MHI_COMMON_H

#include <linux/bitfield.h>
#include <linux/mhi.h>

/* MHI registers */
#define MHIREGLEN			0x00
#define MHIVER				0x08
#define MHICFG				0x10
#define CHDBOFF				0x18
#define ERDBOFF				0x20
#define BHIOFF				0x28
#define BHIEOFF				0x2c
#define DEBUGOFF			0x30
#define MHICTRL				0x38
#define MHISTATUS			0x48
#define CCABAP_LOWER			0x58
#define CCABAP_HIGHER			0x5c
#define ECABAP_LOWER			0x60
#define ECABAP_HIGHER			0x64
#define CRCBAP_LOWER			0x68
#define CRCBAP_HIGHER			0x6c
#define CRDB_LOWER			0x70
#define CRDB_HIGHER			0x74
#define MHICTRLBASE_LOWER		0x80
#define MHICTRLBASE_HIGHER		0x84
#define MHICTRLLIMIT_LOWER		0x88
#define MHICTRLLIMIT_HIGHER		0x8c
#define MHIDATABASE_LOWER		0x98
#define MHIDATABASE_HIGHER		0x9c
#define MHIDATALIMIT_LOWER		0xa0
#define MHIDATALIMIT_HIGHER		0xa4

/* MHI BHI registers */
#define BHI_BHIVERSION_MINOR		0x00
#define BHI_BHIVERSION_MAJOR		0x04
#define BHI_IMGADDR_LOW			0x08
#define BHI_IMGADDR_HIGH		0x0c
#define BHI_IMGSIZE			0x10
#define BHI_RSVD1			0x14
#define BHI_IMGTXDB			0x18
#define BHI_RSVD2			0x1c
#define BHI_INTVEC			0x20
#define BHI_RSVD3			0x24
#define BHI_EXECENV			0x28
#define BHI_STATUS			0x2c
#define BHI_ERRCODE			0x30
#define BHI_ERRDBG1			0x34
#define BHI_ERRDBG2			0x38
#define BHI_ERRDBG3			0x3c
#define BHI_SERIALNU			0x40
#define BHI_SBLANTIROLLVER		0x44
#define BHI_NUMSEG			0x48
#define BHI_MSMHWID(n)			(0x4c + (0x4 * (n)))
#define BHI_OEMPKHASH(n)		(0x64 + (0x4 * (n)))
#define BHI_RSVD5			0xc4

/* BHI register bits */
#define BHI_TXDB_SEQNUM_BMSK		GENMASK(29, 0)
#define BHI_TXDB_SEQNUM_SHFT		0
#define BHI_STATUS_MASK			GENMASK(31, 30)
#define BHI_STATUS_ERROR		0x03
#define BHI_STATUS_SUCCESS		0x02
#define BHI_STATUS_RESET		0x00

/* MHI BHIE registers */
#define BHIE_MSMSOCID_OFFS		0x00
#define BHIE_TXVECADDR_LOW_OFFS		0x2c
#define BHIE_TXVECADDR_HIGH_OFFS	0x30
#define BHIE_TXVECSIZE_OFFS		0x34
#define BHIE_TXVECDB_OFFS		0x3c
#define BHIE_TXVECSTATUS_OFFS		0x44
#define BHIE_RXVECADDR_LOW_OFFS		0x60
#define BHIE_RXVECADDR_HIGH_OFFS	0x64
#define BHIE_RXVECSIZE_OFFS		0x68
#define BHIE_RXVECDB_OFFS		0x70
#define BHIE_RXVECSTATUS_OFFS		0x78

/* BHIE register bits */
#define BHIE_TXVECDB_SEQNUM_BMSK	GENMASK(29, 0)
#define BHIE_TXVECDB_SEQNUM_SHFT	0
#define BHIE_TXVECSTATUS_SEQNUM_BMSK	GENMASK(29, 0)
#define BHIE_TXVECSTATUS_SEQNUM_SHFT	0
#define BHIE_TXVECSTATUS_STATUS_BMSK	GENMASK(31, 30)
#define BHIE_TXVECSTATUS_STATUS_SHFT	30
#define BHIE_TXVECSTATUS_STATUS_RESET	0x00
#define BHIE_TXVECSTATUS_STATUS_XFER_COMPL	0x02
#define BHIE_TXVECSTATUS_STATUS_ERROR	0x03
#define BHIE_RXVECDB_SEQNUM_BMSK	GENMASK(29, 0)
#define BHIE_RXVECDB_SEQNUM_SHFT	0
#define BHIE_RXVECSTATUS_SEQNUM_BMSK	GENMASK(29, 0)
#define BHIE_RXVECSTATUS_SEQNUM_SHFT	0
#define BHIE_RXVECSTATUS_STATUS_BMSK	GENMASK(31, 30)
#define BHIE_RXVECSTATUS_STATUS_SHFT	30
#define BHIE_RXVECSTATUS_STATUS_RESET	0x00
#define BHIE_RXVECSTATUS_STATUS_XFER_COMPL	0x02
#define BHIE_RXVECSTATUS_STATUS_ERROR	0x03

/* MHI register bits */
#define MHICFG_NHWER_MASK		GENMASK(31, 24)
#define MHICFG_NER_MASK			GENMASK(23, 16)
#define MHICFG_NHWCH_MASK		GENMASK(15, 8)
#define MHICFG_NCH_MASK			GENMASK(7, 0)
#define MHICTRL_MHISTATE_MASK		GENMASK(15, 8)
#define MHICTRL_RESET_MASK		BIT(1)
#define MHISTATUS_MHISTATE_MASK		GENMASK(15, 8)
#define MHISTATUS_SYSERR_MASK		BIT(2)
#define MHISTATUS_READY_MASK		BIT(0)

/* Command Ring Element macros */
/* No operation command */
#define MHI_TRE_CMD_NOOP_PTR		0
#define MHI_TRE_CMD_NOOP_DWORD0		0
#define MHI_TRE_CMD_NOOP_DWORD1		cpu_to_le32(FIELD_PREP(GENMASK(23, 16), MHI_CMD_NOP))

/* Channel reset command */
#define MHI_TRE_CMD_RESET_PTR		0
#define MHI_TRE_CMD_RESET_DWORD0	0
#define MHI_TRE_CMD_RESET_DWORD1(chid)	cpu_to_le32(FIELD_PREP(GENMASK(31, 24), chid) | \
						    FIELD_PREP(GENMASK(23, 16),         \
							       MHI_CMD_RESET_CHAN))

/* Channel stop command */
#define MHI_TRE_CMD_STOP_PTR		0
#define MHI_TRE_CMD_STOP_DWORD0		0
#define MHI_TRE_CMD_STOP_DWORD1(chid)	cpu_to_le32(FIELD_PREP(GENMASK(31, 24), chid) | \
						    FIELD_PREP(GENMASK(23, 16),         \
							       MHI_CMD_STOP_CHAN))

/* Channel start command */
#define MHI_TRE_CMD_START_PTR		0
#define MHI_TRE_CMD_START_DWORD0	0
#define MHI_TRE_CMD_START_DWORD1(chid)	cpu_to_le32(FIELD_PREP(GENMASK(31, 24), chid) | \
						    FIELD_PREP(GENMASK(23, 16),         \
							       MHI_CMD_START_CHAN))

#define MHI_TRE_GET_DWORD(tre, word)	le32_to_cpu((tre)->dword[(word)])
#define MHI_TRE_GET_CMD_CHID(tre)	FIELD_GET(GENMASK(31, 24), MHI_TRE_GET_DWORD(tre, 1))
#define MHI_TRE_GET_CMD_TYPE(tre)	FIELD_GET(GENMASK(23, 16), MHI_TRE_GET_DWORD(tre, 1))

/* Event descriptor macros */
#define MHI_TRE_EV_PTR(ptr)		cpu_to_le64(ptr)
#define MHI_TRE_EV_DWORD0(code, len)	cpu_to_le32(FIELD_PREP(GENMASK(31, 24), code) | \
						    FIELD_PREP(GENMASK(15, 0), len))
#define MHI_TRE_EV_DWORD1(chid, type)	cpu_to_le32(FIELD_PREP(GENMASK(31, 24), chid) | \
						    FIELD_PREP(GENMASK(23, 16), type))
#define MHI_TRE_GET_EV_PTR(tre)		le64_to_cpu((tre)->ptr)
#define MHI_TRE_GET_EV_CODE(tre)	FIELD_GET(GENMASK(31, 24), (MHI_TRE_GET_DWORD(tre, 0)))
#define MHI_TRE_GET_EV_LEN(tre)		FIELD_GET(GENMASK(15, 0), (MHI_TRE_GET_DWORD(tre, 0)))
#define MHI_TRE_GET_EV_CHID(tre)	FIELD_GET(GENMASK(31, 24), (MHI_TRE_GET_DWORD(tre, 1)))
#define MHI_TRE_GET_EV_TYPE(tre)	FIELD_GET(GENMASK(23, 16), (MHI_TRE_GET_DWORD(tre, 1)))
#define MHI_TRE_GET_EV_STATE(tre)	FIELD_GET(GENMASK(31, 24), (MHI_TRE_GET_DWORD(tre, 0)))
#define MHI_TRE_GET_EV_EXECENV(tre)	FIELD_GET(GENMASK(31, 24), (MHI_TRE_GET_DWORD(tre, 0)))
#define MHI_TRE_GET_EV_SEQ(tre)		MHI_TRE_GET_DWORD(tre, 0)
#define MHI_TRE_GET_EV_TIME(tre)	MHI_TRE_GET_EV_PTR(tre)
#define MHI_TRE_GET_EV_COOKIE(tre)	lower_32_bits(MHI_TRE_GET_EV_PTR(tre))
#define MHI_TRE_GET_EV_VEID(tre)	FIELD_GET(GENMASK(23, 16), (MHI_TRE_GET_DWORD(tre, 0)))
#define MHI_TRE_GET_EV_LINKSPEED(tre)	FIELD_GET(GENMASK(31, 24), (MHI_TRE_GET_DWORD(tre, 1)))
#define MHI_TRE_GET_EV_LINKWIDTH(tre)	FIELD_GET(GENMASK(7, 0), (MHI_TRE_GET_DWORD(tre, 0)))

/* State change event */
#define MHI_SC_EV_PTR			0
#define MHI_SC_EV_DWORD0(state)		cpu_to_le32(FIELD_PREP(GENMASK(31, 24), state))
#define MHI_SC_EV_DWORD1(type)		cpu_to_le32(FIELD_PREP(GENMASK(23, 16), type))

/* EE event */
#define MHI_EE_EV_PTR			0
#define MHI_EE_EV_DWORD0(ee)		cpu_to_le32(FIELD_PREP(GENMASK(31, 24), ee))
#define MHI_EE_EV_DWORD1(type)		cpu_to_le32(FIELD_PREP(GENMASK(23, 16), type))


/* Command Completion event */
#define MHI_CC_EV_PTR(ptr)		cpu_to_le64(ptr)
#define MHI_CC_EV_DWORD0(code)		cpu_to_le32(FIELD_PREP(GENMASK(31, 24), code))
#define MHI_CC_EV_DWORD1(type)		cpu_to_le32(FIELD_PREP(GENMASK(23, 16), type))

/* Transfer descriptor macros */
#define MHI_TRE_DATA_PTR(ptr)		cpu_to_le64(ptr)
#define MHI_TRE_DATA_DWORD0(len)	cpu_to_le32(FIELD_PREP(GENMASK(15, 0), len))
#define MHI_TRE_TYPE_TRANSFER		2
#define MHI_TRE_DATA_DWORD1(bei, ieot, ieob, chain) cpu_to_le32(FIELD_PREP(GENMASK(23, 16), \
								MHI_TRE_TYPE_TRANSFER) |    \
								FIELD_PREP(BIT(10), bei) |  \
								FIELD_PREP(BIT(9), ieot) |  \
								FIELD_PREP(BIT(8), ieob) |  \
								FIELD_PREP(BIT(0), chain))
#define MHI_TRE_DATA_GET_PTR(tre)	le64_to_cpu((tre)->ptr)
#define MHI_TRE_DATA_GET_LEN(tre)	FIELD_GET(GENMASK(15, 0), MHI_TRE_GET_DWORD(tre, 0))
#define MHI_TRE_DATA_GET_CHAIN(tre)	(!!(FIELD_GET(BIT(0), MHI_TRE_GET_DWORD(tre, 1))))
#define MHI_TRE_DATA_GET_IEOB(tre)	(!!(FIELD_GET(BIT(8), MHI_TRE_GET_DWORD(tre, 1))))
#define MHI_TRE_DATA_GET_IEOT(tre)	(!!(FIELD_GET(BIT(9), MHI_TRE_GET_DWORD(tre, 1))))
#define MHI_TRE_DATA_GET_BEI(tre)	(!!(FIELD_GET(BIT(10), MHI_TRE_GET_DWORD(tre, 1))))

/* RSC transfer descriptor macros */
#define MHI_RSCTRE_DATA_PTR(ptr, len)	cpu_to_le64(FIELD_PREP(GENMASK(64, 48), len) | ptr)
#define MHI_RSCTRE_DATA_DWORD0(cookie)	cpu_to_le32(cookie)
#define MHI_RSCTRE_DATA_DWORD1		cpu_to_le32(FIELD_PREP(GENMASK(23, 16), \
							       MHI_PKT_TYPE_COALESCING))

enum mhi_pkt_type {
	MHI_PKT_TYPE_INVALID = 0x0,
	MHI_PKT_TYPE_NOOP_CMD = 0x1,
	MHI_PKT_TYPE_TRANSFER = 0x2,
	MHI_PKT_TYPE_COALESCING = 0x8,
	MHI_PKT_TYPE_RESET_CHAN_CMD = 0x10,
	MHI_PKT_TYPE_STOP_CHAN_CMD = 0x11,
	MHI_PKT_TYPE_START_CHAN_CMD = 0x12,
	MHI_PKT_TYPE_STATE_CHANGE_EVENT = 0x20,
	MHI_PKT_TYPE_CMD_COMPLETION_EVENT = 0x21,
	MHI_PKT_TYPE_TX_EVENT = 0x22,
	MHI_PKT_TYPE_RSC_TX_EVENT = 0x28,
	MHI_PKT_TYPE_EE_EVENT = 0x40,
	MHI_PKT_TYPE_TSYNC_EVENT = 0x48,
	MHI_PKT_TYPE_BW_REQ_EVENT = 0x50,
	MHI_PKT_TYPE_STALE_EVENT, /* internal event */
};

/* MHI transfer completion events */
enum mhi_ev_ccs {
	MHI_EV_CC_INVALID = 0x0,
	MHI_EV_CC_SUCCESS = 0x1,
	MHI_EV_CC_EOT = 0x2, /* End of transfer event */
	MHI_EV_CC_OVERFLOW = 0x3,
	MHI_EV_CC_EOB = 0x4, /* End of block event */
	MHI_EV_CC_OOB = 0x5, /* Out of block event */
	MHI_EV_CC_DB_MODE = 0x6,
	MHI_EV_CC_UNDEFINED_ERR = 0x10,
	MHI_EV_CC_BAD_TRE = 0x11,
};

/* Channel state */
enum mhi_ch_state {
	MHI_CH_STATE_DISABLED,
	MHI_CH_STATE_ENABLED,
	MHI_CH_STATE_RUNNING,
	MHI_CH_STATE_SUSPENDED,
	MHI_CH_STATE_STOP,
	MHI_CH_STATE_ERROR,
};

enum mhi_cmd_type {
	MHI_CMD_NOP = 1,
	MHI_CMD_RESET_CHAN = 16,
	MHI_CMD_STOP_CHAN = 17,
	MHI_CMD_START_CHAN = 18,
};

#define EV_CTX_RESERVED_MASK		GENMASK(7, 0)
#define EV_CTX_INTMODC_MASK		GENMASK(15, 8)
#define EV_CTX_INTMODT_MASK		GENMASK(31, 16)
struct mhi_event_ctxt {
	__le32 intmod;
	__le32 ertype;
	__le32 msivec;

	__le64 rbase __packed __aligned(4);
	__le64 rlen __packed __aligned(4);
	__le64 rp __packed __aligned(4);
	__le64 wp __packed __aligned(4);
};

#define CHAN_CTX_CHSTATE_MASK		GENMASK(7, 0)
#define CHAN_CTX_BRSTMODE_MASK		GENMASK(9, 8)
#define CHAN_CTX_POLLCFG_MASK		GENMASK(15, 10)
#define CHAN_CTX_RESERVED_MASK		GENMASK(31, 16)
struct mhi_chan_ctxt {
	__le32 chcfg;
	__le32 chtype;
	__le32 erindex;

	__le64 rbase __packed __aligned(4);
	__le64 rlen __packed __aligned(4);
	__le64 rp __packed __aligned(4);
	__le64 wp __packed __aligned(4);
};

struct mhi_cmd_ctxt {
	__le32 reserved0;
	__le32 reserved1;
	__le32 reserved2;

	__le64 rbase __packed __aligned(4);
	__le64 rlen __packed __aligned(4);
	__le64 rp __packed __aligned(4);
	__le64 wp __packed __aligned(4);
};

struct mhi_ring_element {
	__le64 ptr;
	__le32 dword[2];
};

#define MHI_STATE_LIST				\
	mhi_state(RESET,	"RESET")	\
	mhi_state(READY,	"READY")	\
	mhi_state(M0,		"M0")		\
	mhi_state(M1,		"M1")		\
	mhi_state(M2,		"M2")		\
	mhi_state(M3,		"M3")		\
	mhi_state(M3_FAST,	"M3_FAST")	\
	mhi_state(BHI,		"BHI")		\
	mhi_state_end(SYS_ERR,	"SYS ERROR")

#undef mhi_state
#undef mhi_state_end

#define mhi_state(a, b)		case MHI_STATE_##a: return b;
#define mhi_state_end(a, b)	case MHI_STATE_##a: return b;

static inline const char *mhi_state_str(enum mhi_state state)
{
	switch (state) {
	MHI_STATE_LIST
	default:
		return "Unknown state";
	}
}

#endif /* _MHI_COMMON_H */