linux-imx

/* ppa.c   --  low level driver for the IOMEGA PPA3 

 * parallel port SCSI host adapter.

 * 

 * (The PPA3 is the embedded controller in the ZIP drive.)

 * 

 * (c) 1995,1996 Grant R. Guenther, grant@torque.net,

 * under the terms of the GNU General Public License.

 * 

 */

​

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/blkdev.h>

#include <linux/parport.h>

#include <linux/workqueue.h>

#include <linux/delay.h>

#include <linux/jiffies.h>

#include <asm/io.h>

​

#include <scsi/scsi.h>

#include <scsi/scsi_cmnd.h>

#include <scsi/scsi_device.h>

#include <scsi/scsi_host.h>

​

​

static void ppa_reset_pulse(unsigned int base);

​

typedef struct {

    struct pardevice *dev;  /* Parport device entry         */

    int base;       /* Actual port address          */

    int mode;       /* Transfer mode                */

    struct scsi_cmnd *cur_cmd;  /* Current queued command       */

    struct delayed_work ppa_tq; /* Polling interrupt stuff       */

    unsigned long jstart;   /* Jiffies at start             */

    unsigned long recon_tmo;    /* How many usecs to wait for reconnection (6th bit) */

    unsigned int failed:1;  /* Failure flag                 */

    unsigned wanted:1;  /* Parport sharing busy flag    */

    unsigned int dev_no;    /* Device number        */

    wait_queue_head_t *waiting;

    struct Scsi_Host *host;

    struct list_head list;

} ppa_struct;

​

#include  "ppa.h"

​

static inline ppa_struct *ppa_dev(struct Scsi_Host *host)

{

    return *(ppa_struct **)&host->hostdata;

}

​

static DEFINE_SPINLOCK(arbitration_lock);

​

static void got_it(ppa_struct *dev)

{

    dev->base = dev->dev->port->base;

    if (dev->cur_cmd)

        dev->cur_cmd->SCp.phase = 1;

    else

        wake_up(dev->waiting);

}

​