linux-next/include/linux/nvme.h

/*
 * Definitions for the NVM Express interface
 * Copyright (c) 2011-2014, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#ifndef _LINUX_NVME_H
#define _LINUX_NVME_H

#include <uapi/linux/nvme.h>

struct nvme_bar {
	__u64			cap;	/* Controller Capabilities */
	__u32			vs;	/* Version */
	__u32			intms;	/* Interrupt Mask Set */
	__u32			intmc;	/* Interrupt Mask Clear */
	__u32			cc;	/* Controller Configuration */
	__u32			rsvd1;	/* Reserved */
	__u32			csts;	/* Controller Status */
	__u32			nssr;	/* Subsystem Reset */
	__u32			aqa;	/* Admin Queue Attributes */
	__u64			asq;	/* Admin SQ Base Address */
	__u64			acq;	/* Admin CQ Base Address */
	__u32			cmbloc; /* Controller Memory Buffer Location */
	__u32			cmbsz;  /* Controller Memory Buffer Size */
};

#define NVME_CAP_MQES(cap)	((cap) & 0xffff)
#define NVME_CAP_TIMEOUT(cap)	(((cap) >> 24) & 0xff)
#define NVME_CAP_STRIDE(cap)	(((cap) >> 32) & 0xf)
#define NVME_CAP_NSSRC(cap)	(((cap) >> 36) & 0x1)
#define NVME_CAP_MPSMIN(cap)	(((cap) >> 48) & 0xf)
#define NVME_CAP_MPSMAX(cap)	(((cap) >> 52) & 0xf)

#define NVME_CMB_BIR(cmbloc)	((cmbloc) & 0x7)
#define NVME_CMB_OFST(cmbloc)	(((cmbloc) >> 12) & 0xfffff)
#define NVME_CMB_SZ(cmbsz)	(((cmbsz) >> 12) & 0xfffff)
#define NVME_CMB_SZU(cmbsz)	(((cmbsz) >> 8) & 0xf)

#define NVME_CMB_WDS(cmbsz)	((cmbsz) & 0x10)
#define NVME_CMB_RDS(cmbsz)	((cmbsz) & 0x8)
#define NVME_CMB_LISTS(cmbsz)	((cmbsz) & 0x4)
#define NVME_CMB_CQS(cmbsz)	((cmbsz) & 0x2)
#define NVME_CMB_SQS(cmbsz)	((cmbsz) & 0x1)

enum {
	NVME_CC_ENABLE		= 1 << 0,
	NVME_CC_CSS_NVM		= 0 << 4,
	NVME_CC_MPS_SHIFT	= 7,
	NVME_CC_ARB_RR		= 0 << 11,
	NVME_CC_ARB_WRRU	= 1 << 11,
	NVME_CC_ARB_VS		= 7 << 11,
	NVME_CC_SHN_NONE	= 0 << 14,
	NVME_CC_SHN_NORMAL	= 1 << 14,
	NVME_CC_SHN_ABRUPT	= 2 << 14,
	NVME_CC_SHN_MASK	= 3 << 14,
	NVME_CC_IOSQES		= 6 << 16,
	NVME_CC_IOCQES		= 4 << 20,
	NVME_CSTS_RDY		= 1 << 0,
	NVME_CSTS_CFS		= 1 << 1,
	NVME_CSTS_NSSRO		= 1 << 4,
	NVME_CSTS_SHST_NORMAL	= 0 << 2,
	NVME_CSTS_SHST_OCCUR	= 1 << 2,
	NVME_CSTS_SHST_CMPLT	= 2 << 2,
	NVME_CSTS_SHST_MASK	= 3 << 2,
};

#endif /* _LINUX_NVME_H */