libata.h

Axis 221 camera embedded programing interface

	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		orig_n_elem;

	int			dma_dir;

	unsigned int		pad_len;

	unsigned int		nsect;
	unsigned int		cursect;

	unsigned int		nbytes;
	unsigned int		curbytes;

	unsigned int		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() */
	struct scatterlist	*__sg;

	unsigned int		err_mask;
	struct ata_taskfile	result_tf;
	ata_qc_cb_t		complete_fn;

	void			*private_data;
};

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

struct ata_ering_entry {
	int			is_io;
	unsigned int		err_mask;
	u64			timestamp;
};

struct ata_ering {
	int			cursor;
	struct ata_ering_entry	ring[ATA_ERING_SIZE];
};

struct ata_device {
	struct ata_port		*ap;
	unsigned int		devno;		/* 0 or 1 */
	unsigned long		flags;		/* ATA_DFLAG_xxx */
	struct scsi_device	*sdev;		/* attached SCSI device */
	/* n_sector is used as CLEAR_OFFSET, read comment above CLEAR_OFFSET */
	u64			n_sectors;	/* size of device, if ATA */
	unsigned int		class;		/* ATA_DEV_xxx */
	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 */

	unsigned int		multi_count;	/* sectors count for
						   READ/WRITE MULTIPLE */
	unsigned int		max_sectors;	/* per-device max sectors */
	unsigned int		cdb_len;

	/* per-dev xfer mask */
	unsigned int		pio_mask;
	unsigned int		mwdma_mask;
	unsigned int		udma_mask;

	/* for CHS addressing */
	u16			cylinders;	/* Number of cylinders */
	u16			heads;		/* Number of heads */
	u16			sectors;	/* Number of sectors per track */

	/* error history */
	struct ata_ering	ering;
	unsigned int		horkage;	/* List of broken features */
};

/* Offset into struct ata_device.  Fields above it are maintained
 * acress device init.  Fields below are zeroed.
 */
#define ATA_DEVICE_CLEAR_OFFSET		offsetof(struct ata_device, n_sectors)

struct ata_eh_info {
	struct ata_device	*dev;		/* offending device */
	u32			serror;		/* SError from LLDD */
	unsigned int		err_mask;	/* port-wide err_mask */
	unsigned int		action;		/* ATA_EH_* action mask */
	unsigned int		dev_action[ATA_MAX_DEVICES]; /* dev EH action */
	unsigned int		flags;		/* ATA_EHI_* flags */

	unsigned long		hotplug_timestamp;
	unsigned int		probe_mask;

	char			desc[ATA_EH_DESC_LEN];
	int			desc_len;
};

struct ata_eh_context {
	struct ata_eh_info	i;
	int			tries[ATA_MAX_DEVICES];
	unsigned int		classes[ATA_MAX_DEVICES];
	unsigned int		did_probe_mask;
};

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

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

	void			*pad;	/* array of DMA pad buffers */
	dma_addr_t		pad_dma;

	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		pio_mask;
	unsigned int		mwdma_mask;
	unsigned int		udma_mask;
	unsigned int		cbl;	/* cable type; ATA_CBL_xxx */
	unsigned int		hw_sata_spd_limit;
	unsigned int		sata_spd_limit;	/* SATA PHY speed limit */

	/* record runtime error info, protected by host lock */
	struct ata_eh_info	eh_info;
	/* EH context owned by EH */
	struct ata_eh_context	eh_context;

	struct ata_device	device[ATA_MAX_DEVICES];

	struct ata_queued_cmd	qcmd[ATA_MAX_QUEUE];
	unsigned long		qc_allocated;
	unsigned int		qc_active;

	unsigned int		active_tag;
	u32			sactive;

	struct ata_port_stats	stats;
	struct ata_host		*host;
	struct device 		*dev;

	void			*port_task_data;
	struct delayed_work	port_task;
	struct delayed_work	hotplug_task;
	struct work_struct	scsi_rescan_task;

	unsigned int		hsm_task_state;

	u32			msg_enable;
	struct list_head	eh_done_q;
	wait_queue_head_t	eh_wait_q;

	pm_message_t		pm_mesg;
	int			*pm_result;

	void			*private_data;

	u8			sector_buf[ATA_SECT_SIZE]; /* owned by EH */
};

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 *);
	unsigned long (*mode_filter) (const struct ata_port *, struct ata_device *, unsigned long);

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

	void (*exec_command)(struct ata_port *ap, const struct ata_taskfile *tf);
	u8   (*check_status)(struct ata_port *ap);
	u8   (*check_altstatus)(struct ata_port *ap);
	void (*dev_select)(struct ata_port *ap, unsigned int device);

	void (*phy_reset) (struct ata_port *ap); /* obsolete */
	int  (*set_mode) (struct ata_port *ap, struct ata_device **r_failed_dev);

	void (*post_set_mode) (struct ata_port *ap);

	int  (*check_atapi_dma) (struct ata_queued_cmd *qc);

	void (*bmdma_setup) (struct ata_queued_cmd *qc);
	void (*bmdma_start) (struct ata_queued_cmd *qc);

	void (*data_xfer) (struct ata_device *, unsigned char *, unsigned int, int);

	void (*qc_prep) (struct ata_queued_cmd *qc);
	unsigned int (*qc_issue) (struct ata_queued_cmd *qc);

	/* Error handlers.  ->error_handler overrides ->eng_timeout and
	 * indicates that new-style EH is in place.
	 */
	void (*eng_timeout) (struct ata_port *ap); /* obsolete */

	void (*freeze) (struct ata_port *ap);
	void (*thaw) (struct ata_port *ap);
	void (*error_handler) (struct ata_port *ap);
	void (*post_internal_cmd) (struct ata_queued_cmd *qc);

	irq_handler_t irq_handler;
	void (*irq_clear) (struct ata_port *);

	u32 (*scr_read) (struct ata_port *ap, unsigned int sc_reg);
	void (*scr_write) (struct ata_port *ap, unsigned int sc_reg,
			   u32 val);

	int (*port_suspend) (struct ata_port *ap, pm_message_t mesg);
	int (*port_resume) (struct ata_port *ap);

	int (*port_start) (struct ata_port *ap);
	void (*port_stop) (struct ata_port *ap);

	void (*host_stop) (struct ata_host *host);

	void (*bmdma_stop) (struct ata_queued_cmd *qc);
	u8   (*bmdma_status) (struct ata_port *ap);
};

struct ata_port_info {
	struct scsi_host_template	*sht;
	unsigned long		flags;
	unsigned long		pio_mask;
	unsigned long		mwdma_mask;
	unsigned long		udma_mask;
	const struct ata_port_operations *port_ops;
	void 			*private_data;
};

struct ata_timing {
	unsigned short mode;		/* ATA mode */
	unsigned short setup;		/* t1 */
	unsigned short act8b;		/* t2 for 8-bit I/O */
	unsigned short rec8b;		/* t2i for 8-bit I/O */
	unsigned short cyc8b;		/* t0 for 8-bit I/O */
	unsigned short active;		/* t2 or tD */
	unsigned short recover;		/* t2i or tK */
	unsigned short cycle;		/* t0 */
	unsigned short udma;		/* t2CYCTYP/2 */
};

#define FIT(v,vmin,vmax)	max_t(short,min_t(short,v,vmax),vmin)

extern const unsigned long sata_deb_timing_normal[];
extern const unsigned long sata_deb_timing_hotplug[];
extern const unsigned long sata_deb_timing_long[];

extern const struct ata_port_operations ata_dummy_port_ops;

static inline const unsigned long *
sata_ehc_deb_timing(struct ata_eh_context *ehc)
{
	if (ehc->i.flags & ATA_EHI_HOTPLUGGED)
		return sata_deb_timing_hotplug;
	else
		return sata_deb_timing_normal;
}

static inline int ata_port_is_dummy(struct ata_port *ap)
{
	return ap->ops == &ata_dummy_port_ops;
}

extern void ata_port_probe(struct ata_port *);
extern void __sata_phy_reset(struct ata_port *ap);
extern void sata_phy_reset(struct ata_port *ap);
extern void ata_bus_reset(struct ata_port *ap);
extern int sata_set_spd(struct ata_port *ap);
extern int sata_phy_debounce(struct ata_port *ap, const unsigned long *param);
extern int sata_phy_resume(struct ata_port *ap, const unsigned long *param);
extern int ata_std_prereset(struct ata_port *ap);
extern int ata_std_softreset(struct ata_port *ap, unsigned int *classes);
extern int sata_port_hardreset(struct ata_port *ap,
			       const unsigned long *timing);
extern int sata_std_hardreset(struct ata_port *ap, unsigned int *class);
extern void ata_std_postreset(struct ata_port *ap, unsigned int *classes);
extern void ata_port_disable(struct ata_port *);
extern void ata_std_ports(struct ata_ioports *ioaddr);
#ifdef CONFIG_PCI
extern int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
			     unsigned int n_ports);
extern void ata_pci_remove_one (struct pci_dev *pdev);
extern void ata_pci_device_do_suspend(struct pci_dev *pdev, pm_message_t mesg);
extern void ata_pci_device_do_resume(struct pci_dev *pdev);
extern int ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
extern int ata_pci_device_resume(struct pci_dev *pdev);
extern int ata_pci_clear_simplex(struct pci_dev *pdev);
#endif /* CONFIG_PCI */
extern int ata_device_add(const struct ata_probe_ent *ent);
extern void ata_port_detach(struct ata_port *ap);
extern void ata_host_init(struct ata_host *, struct device *,
			  unsigned long, const struct ata_port_operations *);
extern void ata_host_remove(struct ata_host *host);
extern int ata_scsi_detect(struct scsi_host_template *sht);
extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));
extern int ata_scsi_release(struct Scsi_Host *host);
extern void ata_sas_port_destroy(struct ata_port *);
extern struct ata_port *ata_sas_port_alloc(struct ata_host *,
					   struct ata_port_info *, struct Scsi_Host *);
extern int ata_sas_port_init(struct ata_port *);
extern int ata_sas_port_start(struct ata_port *ap);
extern void ata_sas_port_stop(struct ata_port *ap);
extern int ata_sas_slave_configure(struct scsi_device *, struct ata_port *);
extern int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
			    struct ata_port *ap);
extern unsigned int ata_host_intr(struct ata_port *ap, struct ata_queued_cmd *qc);
extern int sata_scr_valid(struct ata_port *ap);
extern int sata_scr_read(struct ata_port *ap, int reg, u32 *val);
extern int sata_scr_write(struct ata_port *ap, int reg, u32 val);
extern int sata_scr_write_flush(struct ata_port *ap, int reg, u32 val);
extern int ata_port_online(struct ata_port *ap);
extern int ata_port_offline(struct ata_port *ap);
extern int ata_scsi_device_resume(struct scsi_device *);
extern int ata_scsi_device_suspend(struct scsi_device *, pm_message_t mesg);
extern int ata_host_suspend(struct ata_host *host, pm_message_t mesg);
extern void ata_host_resume(struct ata_host *host);
extern int ata_ratelimit(void);
extern int ata_busy_sleep(struct ata_port *ap,
			  unsigned long timeout_pat, unsigned long timeout);
extern void ata_port_queue_task(struct ata_port *ap, work_func_t fn,
				void *data, unsigned long delay);
extern u32 ata_wait_register(void __iomem *reg, u32 mask, u32 val,
			     unsigned long interval_msec,
			     unsigned long timeout_msec);

/*
 * Default driver ops implementations
 */
extern void ata_tf_load(struct ata_port *ap, const struct ata_taskfile *tf);
extern void ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf);
extern void ata_tf_to_fis(const struct ata_taskfile *tf, u8 *fis, u8 pmp);
extern void ata_tf_from_fis(const u8 *fis, struct ata_taskfile *tf);
extern void ata_noop_dev_select (struct ata_port *ap, unsigned int device);
extern void ata_std_dev_select (struct ata_port *ap, unsigned int device);
extern u8 ata_check_status(struct ata_port *ap);
extern u8 ata_altstatus(struct ata_port *ap);
extern void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf);
extern int ata_port_start (struct ata_port *ap);
extern void ata_port_stop (struct ata_port *ap);
extern void ata_host_stop (struct ata_host *host);
extern irqreturn_t ata_interrupt (int irq, void *dev_instance);
extern void ata_mmio_data_xfer(struct ata_device *adev, unsigned char *buf,
			       unsigned int buflen, int write_data);
extern void ata_pio_data_xfer(struct ata_device *adev, unsigned char *buf,
			      unsigned int buflen, int write_data);
extern void ata_pio_data_xfer_noirq(struct ata_device *adev, unsigned char *buf,
			      unsigned int buflen, int write_data);
extern void ata_qc_prep(struct ata_queued_cmd *qc);
extern void ata_noop_qc_prep(struct ata_queued_cmd *qc);
extern unsigned int ata_qc_issue_prot(struct ata_queued_cmd *qc);
extern void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf,
		unsigned int buflen);
extern void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
		 unsigned int n_elem);
extern unsigned int ata_dev_classify(const struct ata_taskfile *tf);
extern void ata_id_string(const u16 *id, unsigned char *s,
			  unsigned int ofs, unsigned int len);
extern void ata_id_c_string(const u16 *id, unsigned char *s,
			    unsigned int ofs, unsigned int len);
extern unsigned long ata_device_blacklisted(const struct ata_device *dev);
extern void ata_bmdma_setup (struct ata_queued_cmd *qc);
extern void ata_bmdma_start (struct ata_queued_cmd *qc);
extern void ata_bmdma_stop(struct ata_queued_cmd *qc);
extern u8   ata_bmdma_status(struct ata_port *ap);
extern void ata_bmdma_irq_clear(struct ata_port *ap);
extern void ata_bmdma_freeze(struct ata_port *ap);
extern void ata_bmdma_thaw(struct ata_port *ap);
extern void ata_bmdma_drive_eh(struct ata_port *ap, ata_prereset_fn_t prereset,
			       ata_reset_fn_t softreset,
			       ata_reset_fn_t hardreset,
			       ata_postreset_fn_t postreset);
extern void ata_bmdma_error_handler(struct ata_port *ap);
extern void ata_bmdma_post_internal_cmd(struct ata_queued_cmd *qc);
extern int ata_hsm_move(struct ata_port *ap, struct ata_queued_cmd *qc,
			u8 status, int in_wq);
extern void ata_qc_complete(struct ata_queued_cmd *qc);
extern int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active,
				    void (*finish_qc)(struct ata_queued_cmd *));
extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
			      void (*done)(struct scsi_cmnd *));
extern int ata_std_bios_param(struct scsi_device *sdev,
			      struct block_device *bdev,
			      sector_t capacity, int geom[]);
extern int ata_scsi_slave_config(struct scsi_device *sdev);
extern void ata_scsi_slave_destroy(struct scsi_device *sdev);
extern int ata_scsi_change_queue_depth(struct scsi_device *sdev,
				       int queue_depth);
extern struct ata_device *ata_dev_pair(struct ata_device *adev);

/*
 * Timing helpers
 */

extern unsigned int ata_pio_need_iordy(const struct ata_device *);
extern int ata_timing_compute(struct ata_device *, unsigned short,
			      struct ata_timing *, int, int);