linux-imx

/*

 *  pata_rdc        -   Driver for later RDC PATA controllers

 *

 *  This is actually a driver for hardware meeting

 *  INCITS 370-2004 (1510D): ATA Host Adapter Standards

 *

 *  Based on ata_piix.

 *

 *  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.

 */

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/blkdev.h>

#include <linux/delay.h>

#include <linux/device.h>

#include <linux/gfp.h>

#include <scsi/scsi_host.h>

#include <linux/libata.h>

#include <linux/dmi.h>

​

#define DRV_NAME    "pata_rdc"

#define DRV_VERSION "0.01"

​

struct rdc_host_priv {

    u32 saved_iocfg;

};

​

/**

 *  rdc_pata_cable_detect - Probe host controller cable detect info

 *  @ap: Port for which cable detect info is desired

 *

 *  Read 80c cable indicator from ATA PCI device's PCI config

 *  register.  This register is normally set by firmware (BIOS).

 *

 *  LOCKING:

 *  None (inherited from caller).

 */

​

static int rdc_pata_cable_detect(struct ata_port *ap)

{

    struct rdc_host_priv *hpriv = ap->host->private_data;

    u8 mask;

​

    /* check BIOS cable detect results */

    mask = 0x30 << (2 * ap->port_no);

    if ((hpriv->saved_iocfg & mask) == 0)

        return ATA_CBL_PATA40;

    return ATA_CBL_PATA80;

}