libata.h

umon bootloader source code, support mips cpu.

/*
   Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
   Copyright 2003-2004 Jeff Garzik

   The contents of this file are subject to the Open
   Software License version 1.1 that can be found at
   http://www.opensource.org/licenses/osl-1.1.txt and is included herein
   by reference.

   Alternatively, the contents of this file may be used under the terms
   of the GNU General Public License version 2 (the "GPL") as distributed
   in the kernel source COPYING file, in which case the provisions of
   the GPL are applicable instead of the above.  If you wish to allow
   the use of your version of this file only under the terms of the
   GPL and not to allow others to use your version of this file under
   the OSL, indicate your decision by deleting the provisions above and
   replace them with the notice and other provisions required by the GPL.
   If you do not delete the provisions above, a recipient may use your
   version of this file under either the OSL or the GPL.

 */

#ifndef __LINUX_LIBATA_H__
#define __LINUX_LIBATA_H__

#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <asm/io.h>
#include <linux/ata.h>
#include <linux/workqueue.h>

/*
 * compile-time options
 */
#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 */
#undef ATA_ENABLE_ATAPI		/* define to enable ATAPI support */
#undef ATA_ENABLE_PATA		/* define to enable PATA support in some
				 * low-level drivers */
#undef ATAPI_ENABLE_DMADIR	/* enables ATAPI DMADIR bridge support */


/* 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 */

#ifdef ATA_NDEBUG
#define assert(expr)
#else
#define assert(expr) \
        if(unlikely(!(expr))) {                                   \
        printk(KERN_ERR "Assertion failed! %s,%s,%s,line=%d\n", \
        #expr,__FILE__,__FUNCTION__,__LINE__);          \
        }
#endif

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

/* move to PCI layer? */
static inline struct device *pci_dev_to_dev(struct pci_dev *pdev)
{
	return &pdev->dev;
}

enum {
	/* various global constants */
	LIBATA_MAX_PRD		= ATA_MAX_PRD / 2,
	ATA_MAX_PORTS		= 8,
	ATA_DEF_QUEUE		= 1,
	ATA_MAX_QUEUE		= 1,
	ATA_MAX_SECTORS		= 200,	/* FIXME */
	ATA_MAX_BUS		= 2,
	ATA_DEF_BUSY_WAIT	= 10000,
	ATA_SHORT_PAUSE		= (HZ >> 6) + 1,

	ATA_SHT_EMULATED	= 1,
	ATA_SHT_CMD_PER_LUN	= 1,
	ATA_SHT_THIS_ID		= -1,
	ATA_SHT_USE_CLUSTERING	= 0,

	/* struct ata_device stuff */
	ATA_DFLAG_LBA48		= (1 << 0), /* device supports LBA48 */
	ATA_DFLAG_PIO		= (1 << 1), /* device currently in PIO mode */
	ATA_DFLAG_LOCK_SECTORS	= (1 << 2), /* don't adjust max_sectors */

	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_NONE		= 5,	/* no device */

	/* struct ata_port flags */
	ATA_FLAG_SLAVE_POSS	= (1 << 1), /* host supports slave dev */
					    /* (doesn't imply presence) */
	ATA_FLAG_PORT_DISABLED	= (1 << 2), /* port is disabled, ignore it */
	ATA_FLAG_SATA		= (1 << 3),
	ATA_FLAG_NO_LEGACY	= (1 << 4), /* no legacy mode check */
	ATA_FLAG_SRST		= (1 << 5), /* use ATA SRST, not E.D.D. */
	ATA_FLAG_MMIO		= (1 << 6), /* use MMIO, not PIO */
	ATA_FLAG_SATA_RESET	= (1 << 7), /* use COMRESET */
	ATA_FLAG_PIO_DMA	= (1 << 8), /* PIO cmds via DMA */

	ATA_QCFLAG_ACTIVE	= (1 << 1), /* cmd not yet ack'd to scsi lyer */
	ATA_QCFLAG_SG		= (1 << 3), /* have s/g table? */
	ATA_QCFLAG_SINGLE	= (1 << 4), /* no s/g, just a single buffer */
	ATA_QCFLAG_DMAMAP	= ATA_QCFLAG_SG | ATA_QCFLAG_SINGLE,

	/* various lengths of time */
	ATA_TMOUT_EDD		= 5 * HZ,	/* hueristic */
	ATA_TMOUT_PIO		= 30 * HZ,
	ATA_TMOUT_BOOT		= 30 * HZ,	/* hueristic */
	ATA_TMOUT_BOOT_QUICK	= 7 * HZ,	/* hueristic */
	ATA_TMOUT_CDB		= 30 * HZ,
	ATA_TMOUT_CDB_QUICK	= 5 * HZ,

	/* 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 long bitmap
	 */
	ATA_SHIFT_UDMA		= 0,
	ATA_SHIFT_MWDMA		= 8,
	ATA_SHIFT_PIO		= 11,
};

enum pio_task_states {
	PIO_ST_UNKNOWN,
	PIO_ST_IDLE,
	PIO_ST_POLL,
	PIO_ST_TMOUT,
	PIO_ST,
	PIO_ST_LAST,
	PIO_ST_LAST_POLL,
	PIO_ST_ERR,
};

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

/* typedefs */
typedef int (*ata_qc_cb_t) (struct ata_queued_cmd *qc, u8 drv_stat);

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

struct ata_probe_ent {
	struct list_head	node;
	struct device 		*dev;
	struct ata_port_operations	*port_ops;
	Scsi_Host_Template	*sht;
	struct ata_ioports	port[ATA_MAX_PORTS];
	unsigned int		n_ports;
	unsigned int		hard_port_no;
	unsigned int		pio_mask;
	unsigned int		mwdma_mask;
	unsigned int		udma_mask;
	unsigned int		legacy_mode;
	unsigned long		irq;
	unsigned int		irq_flags;
	unsigned long		host_flags;
	void __iomem		*mmio_base;
	void			*private_data;
};

struct ata_host_set {
	spinlock_t		lock;
	struct device 		*dev;
	unsigned long		irq;
	void __iomem		*mmio_base;
	unsigned int		n_ports;
	void			*private_data;
	struct ata_port_operations *ops;
	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;

	int			dma_dir;

	unsigned int		nsect;
	unsigned int		cursect;

	unsigned int		nbytes;
	unsigned int		curbytes;

	unsigned int		cursg;
	unsigned int		cursg_ofs;

	struct scatterlist	sgent;
	void			*buf_virt;

	struct scatterlist	*sg;

	ata_qc_cb_t		complete_fn;

	struct completion	*waiting;

	void			*private_data;
};

struct ata_host_stats {
	unsigned long		unhandled_irq;
	unsigned long		idle_irq;
	unsigned long		rw_reqbuf;
};

struct ata_device {
	u64			n_sectors;	/* size of device, if ATA */
	unsigned long		flags;		/* ATA_DFLAG_xxx */
	unsigned int		class;		/* ATA_DEV_xxx */
	unsigned int		devno;		/* 0 or 1 */
	u16			id[ATA_ID_WORDS]; /* IDENTIFY xxx DEVICE data */
	u8			pio_mode;
	u8			dma_mode;
	u8			xfer_mode;
	unsigned int		xfer_shift;	/* ATA_SHIFT_xxx */

	/* cache info about current transfer mode */
	u8			xfer_protocol;	/* taskfile xfer protocol */
	u8			read_cmd;	/* opcode to use on read */
	u8			write_cmd;	/* opcode to use on write */
};

struct ata_port {
	struct Scsi_Host	*host;	/* our co-allocated scsi host */
	struct ata_port_operations	*ops;
	unsigned long		flags;	/* ATA_FLAG_xxx */
	unsigned int		id;	/* unique id req'd by scsi midlyr */
	unsigned int		port_no; /* unique port #; from zero */
	unsigned int		hard_port_no;	/* hardware port #; from zero */

	struct ata_prd		*prd;	 /* our SG list */
	dma_addr_t		prd_dma; /* and its DMA mapping */

	struct ata_ioports	ioaddr;	/* ATA cmd/ctl/dma register blocks */

	u8			ctl;	/* cache of ATA control register */
	u8			last_ctl;	/* Cache last written value */
	unsigned int		bus_state;
	unsigned int		port_state;
	unsigned int		pio_mask;
	unsigned int		mwdma_mask;
	unsigned int		udma_mask;
	unsigned int		cbl;	/* cable type; ATA_CBL_xxx */
	unsigned int		cdb_len;

	struct ata_device	device[ATA_MAX_DEVICES];

	struct ata_queued_cmd	qcmd[ATA_MAX_QUEUE];
	unsigned long		qactive;
	unsigned int		active_tag;

	struct ata_host_stats	stats;
	struct ata_host_set	*host_set;

	struct work_struct	packet_task;

	struct work_struct	pio_task;
	unsigned int		pio_task_state;
	unsigned long		pio_task_timeout;

	void			*private_data;
};

struct ata_port_operations {
	void (*port_disable) (struct ata_port *);

	void (*dev_config) (struct ata_port *, struct ata_device *);

	void (*set_piomode) (struct ata_port *, struct ata_device *);
	void (*set_dmamode) (struct ata_port *, struct ata_device *);

	void (*tf_load) (struct ata_port *ap, struct ata_taskfile *tf);
	void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);