linux-imx

/*

 * ATAPI support.

 */

​

#include <linux/kernel.h>

#include <linux/cdrom.h>

#include <linux/delay.h>

#include <linux/export.h>

#include <linux/ide.h>

#include <linux/scatterlist.h>

#include <linux/gfp.h>

​

#include <scsi/scsi.h>

​

#define DRV_NAME "ide-atapi"

#define PFX DRV_NAME ": "

​

#ifdef DEBUG

#define debug_log(fmt, args...) \

    printk(KERN_INFO "ide: " fmt, ## args)

#else

#define debug_log(fmt, args...) do {} while (0)

#endif

​

#define ATAPI_MIN_CDB_BYTES 12

​

static inline int dev_is_idecd(ide_drive_t *drive)

{

    return drive->media == ide_cdrom || drive->media == ide_optical;

}

​

/*

 * Check whether we can support a device,

 * based on the ATAPI IDENTIFY command results.

 */

int ide_check_atapi_device(ide_drive_t *drive, const char *s)

{

    u16 *id = drive->id;

    u8 gcw[2], protocol, device_type, removable, drq_type, packet_size;

​

    *((u16 *)&gcw) = id[ATA_ID_CONFIG];

​

    protocol    = (gcw[1] & 0xC0) >> 6;

    device_type =  gcw[1] & 0x1F;

    removable   = (gcw[0] & 0x80) >> 7;

    drq_type    = (gcw[0] & 0x60) >> 5;

    packet_size =  gcw[0] & 0x03;

​

#ifdef CONFIG_PPC

    /* kludge for Apple PowerBook internal zip */

    if (drive->media == ide_floppy && device_type == 5 &&

        !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&

        strstr((char *)&id[ATA_ID_PROD], "ZIP"))

        device_type = 0;

#endif

​

    if (protocol != 2)

        printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",

            s, drive->name, protocol);

    else if ((drive->media == ide_floppy && device_type != 0) ||

         (drive->media == ide_tape && device_type != 1))

        printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",

            s, drive->name, device_type);