libata.h

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/*
 *  Copyright 2003-2005 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2005 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that 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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 */

#ifndef __LINUX_LIBATA_H__
#define __LINUX_LIBATA_H__

#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/scatterlist.h>
#include <linux/io.h>
#include <linux/ata.h>
#include <linux/workqueue.h>
#include <scsi/scsi_host.h>
#include <linux/acpi.h>

/*
 * Define if arch has non-standard setup.  This is a _PCI_ standard
 * not a legacy or ISA standard.
 */
#ifdef CONFIG_ATA_NONSTANDARD
#include <asm/libata-portmap.h>
#else
#include <asm-generic/libata-portmap.h>
#endif

/*
 * compile-time options: to be removed as soon as all the drivers are
 * converted to the new debugging mechanism
 */
#undef ATA_DEBUG		/* debugging output */
#undef ATA_VERBOSE_DEBUG	/* yet more debugging output */
#undef ATA_IRQ_TRAP		/* define to ack screaming irqs */
#undef ATA_NDEBUG		/* define to disable quick runtime checks */


/* note: prints function name for you */
#ifdef ATA_DEBUG
#define DPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
#ifdef ATA_VERBOSE_DEBUG
#define VPRINTK(fmt, args...) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)
#else
#define VPRINTK(fmt, args...)
#endif	/* ATA_VERBOSE_DEBUG */
#else
#define DPRINTK(fmt, args...)
#define VPRINTK(fmt, args...)
#endif	/* ATA_DEBUG */

#define BPRINTK(fmt, args...) if (ap->flags & ATA_FLAG_DEBUGMSG) printk(KERN_ERR "%s: " fmt, __FUNCTION__, ## args)

/* NEW: debug levels */
#define HAVE_LIBATA_MSG 1

enum {
	ATA_MSG_DRV	= 0x0001,
	ATA_MSG_INFO	= 0x0002,
	ATA_MSG_PROBE	= 0x0004,
	ATA_MSG_WARN	= 0x0008,
	ATA_MSG_MALLOC	= 0x0010,
	ATA_MSG_CTL	= 0x0020,
	ATA_MSG_INTR	= 0x0040,
	ATA_MSG_ERR	= 0x0080,
};

#define ata_msg_drv(p)    ((p)->msg_enable & ATA_MSG_DRV)
#define ata_msg_info(p)   ((p)->msg_enable & ATA_MSG_INFO)
#define ata_msg_probe(p)  ((p)->msg_enable & ATA_MSG_PROBE)
#define ata_msg_warn(p)   ((p)->msg_enable & ATA_MSG_WARN)
#define ata_msg_malloc(p) ((p)->msg_enable & ATA_MSG_MALLOC)
#define ata_msg_ctl(p)    ((p)->msg_enable & ATA_MSG_CTL)
#define ata_msg_intr(p)   ((p)->msg_enable & ATA_MSG_INTR)
#define ata_msg_err(p)    ((p)->msg_enable & ATA_MSG_ERR)

static inline u32 ata_msg_init(int dval, int default_msg_enable_bits)
{
	if (dval < 0 || dval >= (sizeof(u32) * 8))
		return default_msg_enable_bits; /* should be 0x1 - only driver info msgs */
	if (!dval)
		return 0;
	return (1 << dval) - 1;
}

/* defines only for the constants which don't work well as enums */
#define ATA_TAG_POISON		0xfafbfcfdU

enum {
	/* various global constants */
	LIBATA_MAX_PRD		= ATA_MAX_PRD / 2,
	LIBATA_DUMB_MAX_PRD	= ATA_MAX_PRD / 4,	/* Worst case */
	ATA_MAX_PORTS		= 8,
	ATA_DEF_QUEUE		= 1,
	/* tag ATA_MAX_QUEUE - 1 is reserved for internal commands */
	ATA_MAX_QUEUE		= 32,
	ATA_TAG_INTERNAL	= ATA_MAX_QUEUE - 1,
	ATA_MAX_BUS		= 2,
	ATA_DEF_BUSY_WAIT	= 10000,
	ATA_SHORT_PAUSE		= (HZ >> 6) + 1,

	ATAPI_MAX_DRAIN		= 16 << 10,

	ATA_SHT_EMULATED	= 1,
	ATA_SHT_CMD_PER_LUN	= 1,
	ATA_SHT_THIS_ID		= -1,
	ATA_SHT_USE_CLUSTERING	= 1,

	/* struct ata_device stuff */
	ATA_DFLAG_LBA		= (1 << 0), /* device supports LBA */
	ATA_DFLAG_LBA48		= (1 << 1), /* device supports LBA48 */
	ATA_DFLAG_CDB_INTR	= (1 << 2), /* device asserts INTRQ when ready for CDB */
	ATA_DFLAG_NCQ		= (1 << 3), /* device supports NCQ */
	ATA_DFLAG_FLUSH_EXT	= (1 << 4), /* do FLUSH_EXT instead of FLUSH */
	ATA_DFLAG_ACPI_PENDING	= (1 << 5), /* ACPI resume action pending */
	ATA_DFLAG_ACPI_FAILED	= (1 << 6), /* ACPI on devcfg has failed */
	ATA_DFLAG_AN		= (1 << 7), /* AN configured */
	ATA_DFLAG_HIPM		= (1 << 8), /* device supports HIPM */
	ATA_DFLAG_DIPM		= (1 << 9), /* device supports DIPM */
	ATA_DFLAG_CFG_MASK	= (1 << 12) - 1,

	ATA_DFLAG_PIO		= (1 << 12), /* device limited to PIO mode */
	ATA_DFLAG_NCQ_OFF	= (1 << 13), /* device limited to non-NCQ mode */
	ATA_DFLAG_SPUNDOWN	= (1 << 14), /* XXX: for spindown_compat */
	ATA_DFLAG_SLEEPING	= (1 << 15), /* device is sleeping */
	ATA_DFLAG_INIT_MASK	= (1 << 16) - 1,

	ATA_DFLAG_DETACH	= (1 << 16),
	ATA_DFLAG_DETACHED	= (1 << 17),

	ATA_DEV_UNKNOWN		= 0,	/* unknown device */
	ATA_DEV_ATA		= 1,	/* ATA device */
	ATA_DEV_ATA_UNSUP	= 2,	/* ATA device (unsupported) */
	ATA_DEV_ATAPI		= 3,	/* ATAPI device */
	ATA_DEV_ATAPI_UNSUP	= 4,	/* ATAPI device (unsupported) */
	ATA_DEV_PMP		= 5,	/* SATA port multiplier */
	ATA_DEV_PMP_UNSUP	= 6,	/* SATA port multiplier (unsupported) */
	ATA_DEV_SEMB		= 7,	/* SEMB */
	ATA_DEV_SEMB_UNSUP	= 8,	/* SEMB (unsupported) */
	ATA_DEV_NONE		= 9,	/* no device */

	/* struct ata_link flags */
	ATA_LFLAG_HRST_TO_RESUME = (1 << 0), /* hardreset to resume link */
	ATA_LFLAG_SKIP_D2H_BSY	= (1 << 1), /* can't wait for the first D2H
					     * Register FIS clearing BSY */
	ATA_LFLAG_NO_SRST	= (1 << 2), /* avoid softreset */
	ATA_LFLAG_ASSUME_ATA	= (1 << 3), /* assume ATA class */
	ATA_LFLAG_ASSUME_SEMB	= (1 << 4), /* assume SEMB class */
	ATA_LFLAG_ASSUME_CLASS	= ATA_LFLAG_ASSUME_ATA | ATA_LFLAG_ASSUME_SEMB,
	ATA_LFLAG_NO_RETRY	= (1 << 5), /* don't retry this link */
	ATA_LFLAG_DISABLED	= (1 << 6), /* link is disabled */

	/* struct ata_port flags */
	ATA_FLAG_SLAVE_POSS	= (1 << 0), /* host supports slave dev */
					    /* (doesn't imply presence) */
	ATA_FLAG_SATA		= (1 << 1),
	ATA_FLAG_NO_LEGACY	= (1 << 2), /* no legacy mode check */
	ATA_FLAG_MMIO		= (1 << 3), /* use MMIO, not PIO */
	ATA_FLAG_SRST		= (1 << 4), /* (obsolete) use ATA SRST, not E.D.D. */
	ATA_FLAG_SATA_RESET	= (1 << 5), /* (obsolete) use COMRESET */
	ATA_FLAG_NO_ATAPI	= (1 << 6), /* No ATAPI support */
	ATA_FLAG_PIO_DMA	= (1 << 7), /* PIO cmds via DMA */
	ATA_FLAG_PIO_LBA48	= (1 << 8), /* Host DMA engine is LBA28 only */
	ATA_FLAG_PIO_POLLING	= (1 << 9), /* use polling PIO if LLD
					     * doesn't handle PIO interrupts */
	ATA_FLAG_NCQ		= (1 << 10), /* host supports NCQ */
	ATA_FLAG_DEBUGMSG	= (1 << 13),
	ATA_FLAG_IGN_SIMPLEX	= (1 << 15), /* ignore SIMPLEX */
	ATA_FLAG_NO_IORDY	= (1 << 16), /* controller lacks iordy */
	ATA_FLAG_ACPI_SATA	= (1 << 17), /* need native SATA ACPI layout */
	ATA_FLAG_AN		= (1 << 18), /* controller supports AN */
	ATA_FLAG_PMP		= (1 << 19), /* controller supports PMP */
	ATA_FLAG_IPM		= (1 << 20), /* driver can handle IPM */

	/* The following flag belongs to ap->pflags but is kept in
	 * ap->flags because it's referenced in many LLDs and will be
	 * removed in not-too-distant future.
	 */
	ATA_FLAG_DISABLED	= (1 << 23), /* port is disabled, ignore it */

	/* bits 24:31 of ap->flags are reserved for LLD specific flags */

	/* struct ata_port pflags */
	ATA_PFLAG_EH_PENDING	= (1 << 0), /* EH pending */
	ATA_PFLAG_EH_IN_PROGRESS = (1 << 1), /* EH in progress */
	ATA_PFLAG_FROZEN	= (1 << 2), /* port is frozen */
	ATA_PFLAG_RECOVERED	= (1 << 3), /* recovery action performed */
	ATA_PFLAG_LOADING	= (1 << 4), /* boot/loading probe */
	ATA_PFLAG_UNLOADING	= (1 << 5), /* module is unloading */
	ATA_PFLAG_SCSI_HOTPLUG	= (1 << 6), /* SCSI hotplug scheduled */
	ATA_PFLAG_INITIALIZING	= (1 << 7), /* being initialized, don't touch */
	ATA_PFLAG_RESETTING	= (1 << 8), /* reset in progress */

	ATA_PFLAG_SUSPENDED	= (1 << 17), /* port is suspended (power) */
	ATA_PFLAG_PM_PENDING	= (1 << 18), /* PM operation pending */
	ATA_PFLAG_INIT_GTM_VALID = (1 << 19), /* initial gtm data valid */

	/* struct ata_queued_cmd flags */
	ATA_QCFLAG_ACTIVE	= (1 << 0), /* cmd not yet ack'd to scsi lyer */
	ATA_QCFLAG_SG		= (1 << 1), /* have s/g table? */
	ATA_QCFLAG_SINGLE	= (1 << 2), /* no s/g, just a single buffer */
	ATA_QCFLAG_DMAMAP	= ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE,
	ATA_QCFLAG_IO		= (1 << 3), /* standard IO command */
	ATA_QCFLAG_RESULT_TF	= (1 << 4), /* result TF requested */
	ATA_QCFLAG_CLEAR_EXCL	= (1 << 5), /* clear excl_link on completion */
	ATA_QCFLAG_QUIET	= (1 << 6), /* don't report device error */

	ATA_QCFLAG_FAILED	= (1 << 16), /* cmd failed and is owned by EH */
	ATA_QCFLAG_SENSE_VALID	= (1 << 17), /* sense data valid */
	ATA_QCFLAG_EH_SCHEDULED = (1 << 18), /* EH scheduled (obsolete) */

	/* host set flags */
	ATA_HOST_SIMPLEX	= (1 << 0),	/* Host is simplex, one DMA channel per host only */
	ATA_HOST_STARTED	= (1 << 1),	/* Host started */

	/* bits 24:31 of host->flags are reserved for LLD specific flags */

	/* various lengths of time */
	ATA_TMOUT_BOOT		= 30 * HZ,	/* heuristic */
	ATA_TMOUT_BOOT_QUICK	= 7 * HZ,	/* heuristic */
	ATA_TMOUT_INTERNAL	= 30 * HZ,
	ATA_TMOUT_INTERNAL_QUICK = 5 * HZ,

	/* FIXME: GoVault needs 2s but we can't afford that without
	 * parallel probing.  800ms is enough for iVDR disk
	 * HHD424020F7SV00.  Increase to 2secs when parallel probing
	 * is in place.
	 */
	ATA_TMOUT_FF_WAIT	= 4 * HZ / 5,

	/* ATA bus states */
	BUS_UNKNOWN		= 0,
	BUS_DMA			= 1,
	BUS_IDLE		= 2,
	BUS_NOINTR		= 3,
	BUS_NODATA		= 4,
	BUS_TIMER		= 5,
	BUS_PIO			= 6,
	BUS_EDD			= 7,
	BUS_IDENTIFY		= 8,
	BUS_PACKET		= 9,

	/* SATA port states */
	PORT_UNKNOWN		= 0,
	PORT_ENABLED		= 1,
	PORT_DISABLED		= 2,

	/* encoding various smaller bitmaps into a single
	 * unsigned int bitmap
	 */
	ATA_BITS_PIO		= 7,
	ATA_BITS_MWDMA		= 5,
	ATA_BITS_UDMA		= 8,

	ATA_SHIFT_PIO		= 0,
	ATA_SHIFT_MWDMA		= ATA_SHIFT_PIO + ATA_BITS_PIO,
	ATA_SHIFT_UDMA		= ATA_SHIFT_MWDMA + ATA_BITS_MWDMA,

	ATA_MASK_PIO		= ((1 << ATA_BITS_PIO) - 1) << ATA_SHIFT_PIO,
	ATA_MASK_MWDMA		= ((1 << ATA_BITS_MWDMA) - 1) << ATA_SHIFT_MWDMA,
	ATA_MASK_UDMA		= ((1 << ATA_BITS_UDMA) - 1) << ATA_SHIFT_UDMA,

	/* size of buffer to pad xfers ending on unaligned boundaries */
	ATA_DMA_PAD_SZ		= 4,
	ATA_DMA_PAD_BUF_SZ	= ATA_DMA_PAD_SZ * ATA_MAX_QUEUE,

	/* ering size */
	ATA_ERING_SIZE		= 32,

	/* return values for ->qc_defer */
	ATA_DEFER_LINK		= 1,
	ATA_DEFER_PORT		= 2,

	/* desc_len for ata_eh_info and context */
	ATA_EH_DESC_LEN		= 80,

	/* reset / recovery action types */
	ATA_EH_REVALIDATE	= (1 << 0),
	ATA_EH_SOFTRESET	= (1 << 1),
	ATA_EH_HARDRESET	= (1 << 2),
	ATA_EH_ENABLE_LINK	= (1 << 3),

	ATA_EH_RESET_MASK	= ATA_EH_SOFTRESET | ATA_EH_HARDRESET,
	ATA_EH_PERDEV_MASK	= ATA_EH_REVALIDATE,

	/* ata_eh_info->flags */
	ATA_EHI_HOTPLUGGED	= (1 << 0),  /* could have been hotplugged */
	ATA_EHI_RESUME_LINK	= (1 << 1),  /* resume link (reset modifier) */
	ATA_EHI_NO_AUTOPSY	= (1 << 2),  /* no autopsy */
	ATA_EHI_QUIET		= (1 << 3),  /* be quiet */
	ATA_EHI_LPM		= (1 << 4),  /* link power management action */

	ATA_EHI_DID_SOFTRESET	= (1 << 16), /* already soft-reset this port */
	ATA_EHI_DID_HARDRESET	= (1 << 17), /* already soft-reset this port */
	ATA_EHI_PRINTINFO	= (1 << 18), /* print configuration info */
	ATA_EHI_SETMODE		= (1 << 19), /* configure transfer mode */
	ATA_EHI_POST_SETMODE	= (1 << 20), /* revaildating after setmode */

	ATA_EHI_DID_RESET	= ATA_EHI_DID_SOFTRESET | ATA_EHI_DID_HARDRESET,
	ATA_EHI_RESET_MODIFIER_MASK = ATA_EHI_RESUME_LINK,

	/* max tries if error condition is still set after ->error_handler */
	ATA_EH_MAX_TRIES	= 5,

	/* how hard are we gonna try to probe/recover devices */
	ATA_PROBE_MAX_TRIES	= 3,
	ATA_EH_DEV_TRIES	= 3,
	ATA_EH_PMP_TRIES	= 5,
	ATA_EH_PMP_LINK_TRIES	= 3,

	SATA_PMP_SCR_TIMEOUT	= 250,

	/* Horkage types. May be set by libata or controller on drives
	   (some horkage may be drive/controller pair dependant */

	ATA_HORKAGE_DIAGNOSTIC	= (1 << 0),	/* Failed boot diag */
	ATA_HORKAGE_NODMA	= (1 << 1),	/* DMA problems */
	ATA_HORKAGE_NONCQ	= (1 << 2),	/* Don't use NCQ */
	ATA_HORKAGE_MAX_SEC_128	= (1 << 3),	/* Limit max sects to 128 */
	ATA_HORKAGE_BROKEN_HPA	= (1 << 4),	/* Broken HPA */
	ATA_HORKAGE_SKIP_PM	= (1 << 5),	/* Skip PM operations */
	ATA_HORKAGE_HPA_SIZE	= (1 << 6),	/* native size off by one */
	ATA_HORKAGE_IPM		= (1 << 7),	/* Link PM problems */
	ATA_HORKAGE_IVB		= (1 << 8),	/* cbl det validity bit bugs */
	ATA_HORKAGE_STUCK_ERR	= (1 << 9),	/* stuck ERR on next PACKET */

	 /* DMA mask for user DMA control: User visible values; DO NOT
	    renumber */
	ATA_DMA_MASK_ATA	= (1 << 0),	/* DMA on ATA Disk */
	ATA_DMA_MASK_ATAPI	= (1 << 1),	/* DMA on ATAPI */
	ATA_DMA_MASK_CFA	= (1 << 2),	/* DMA on CF Card */
};

enum hsm_task_states {
	HSM_ST_IDLE,		/* no command on going */
	HSM_ST_FIRST,		/* (waiting the device to)
				   write CDB or first data block */
	HSM_ST,			/* (waiting the device to) transfer data */
	HSM_ST_LAST,		/* (waiting the device to) complete command */
	HSM_ST_ERR,		/* error */
};

enum ata_completion_errors {
	AC_ERR_DEV		= (1 << 0), /* device reported error */
	AC_ERR_HSM		= (1 << 1), /* host state machine violation */
	AC_ERR_TIMEOUT		= (1 << 2), /* timeout */
	AC_ERR_MEDIA		= (1 << 3), /* media error */
	AC_ERR_ATA_BUS		= (1 << 4), /* ATA bus error */
	AC_ERR_HOST_BUS		= (1 << 5), /* host bus error */
	AC_ERR_SYSTEM		= (1 << 6), /* system error */
	AC_ERR_INVALID		= (1 << 7), /* invalid argument */
	AC_ERR_OTHER		= (1 << 8), /* unknown */
	AC_ERR_NODEV_HINT	= (1 << 9), /* polling device detection hint */
	AC_ERR_NCQ		= (1 << 10), /* marker for offending NCQ qc */
};

/* forward declarations */
struct scsi_device;
struct ata_port_operations;
struct ata_port;
struct ata_link;
struct ata_queued_cmd;

/* typedefs */
typedef void (*ata_qc_cb_t) (struct ata_queued_cmd *qc);
typedef int (*ata_prereset_fn_t)(struct ata_link *link, unsigned long deadline);
typedef int (*ata_reset_fn_t)(struct ata_link *link, unsigned int *classes,
			      unsigned long deadline);
typedef void (*ata_postreset_fn_t)(struct ata_link *link, unsigned int *classes);

/*
 * host pm policy: If you alter this, you also need to alter libata-scsi.c
 * (for the ascii descriptions)
 */
enum link_pm {
	NOT_AVAILABLE,
	MIN_POWER,
	MAX_PERFORMANCE,
	MEDIUM_POWER,
};
extern struct class_device_attribute class_device_attr_link_power_management_policy;

struct ata_ioports {
	void __iomem		*cmd_addr;
	void __iomem		*data_addr;
	void __iomem		*error_addr;
	void __iomem		*feature_addr;
	void __iomem		*nsect_addr;
	void __iomem		*lbal_addr;
	void __iomem		*lbam_addr;
	void __iomem		*lbah_addr;
	void __iomem		*device_addr;
	void __iomem		*status_addr;
	void __iomem		*command_addr;
	void __iomem		*altstatus_addr;
	void __iomem		*ctl_addr;
	void __iomem		*bmdma_addr;
	void __iomem		*scr_addr;
};

struct ata_host {
	spinlock_t		lock;
	struct device 		*dev;
	void __iomem * const	*iomap;
	unsigned int		n_ports;
	void			*private_data;
	const struct ata_port_operations *ops;
	unsigned long		flags;
#ifdef CONFIG_ATA_ACPI
	acpi_handle		acpi_handle;
#endif
	struct ata_port		*simplex_claimed;	/* channel owning the DMA */
	struct ata_port		*ports[0];
};

struct ata_queued_cmd {
	struct ata_port		*ap;
	struct ata_device	*dev;

	struct scsi_cmnd	*scsicmd;
	void			(*scsidone)(struct scsi_cmnd *);

	struct ata_taskfile	tf;
	u8			cdb[ATAPI_CDB_LEN];

	unsigned long		flags;		/* ATA_QCFLAG_xxx */
	unsigned int		tag;
	unsigned int		n_elem;
	unsigned int		n_iter;
	unsigned int		orig_n_elem;

	int			dma_dir;

	unsigned int		pad_len;
	unsigned int		sect_size;

	unsigned int		nbytes;
	unsigned int		curbytes;

	struct scatterlist	*cursg;
	unsigned int		cursg_ofs;

	struct scatterlist	sgent;
	struct scatterlist	pad_sgent;
	void			*buf_virt;

	/* DO NOT iterate over __sg manually, use ata_for_each_sg() */