linux-imx

/*

 * New ATA layer SC1200 driver      Alan Cox <alan@lxorguk.ukuu.org.uk>

 *

 * TODO: Mode selection filtering

 * TODO: Needs custom DMA cleanup code

 *

 * Based very heavily on

 *

 * linux/drivers/ide/pci/sc1200.c       Version 0.91    28-Jan-2003

 *

 * Copyright (C) 2000-2002      Mark Lord <mlord@pobox.com>

 * May be copied or modified under the terms of the GNU General Public License

 *

 * Development of this chipset driver was funded

 * by the nice folks at National Semiconductor.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * 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; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 */

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/blkdev.h>

#include <linux/delay.h>

#include <scsi/scsi_host.h>

#include <linux/libata.h>

​

#define DRV_NAME    "pata_sc1200"

#define DRV_VERSION "0.2.6"

​

#define SC1200_REV_A    0x00

#define SC1200_REV_B1   0x01

#define SC1200_REV_B3   0x02

#define SC1200_REV_C1   0x03

#define SC1200_REV_D1   0x04

​

/**

 *  sc1200_clock    -   PCI clock

 *

 *  Return the PCI bus clocking for the SC1200 chipset configuration

 *  in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz

 */

​

static int sc1200_clock(void)

{

    /* Magic registers that give us the chipset data */

    u8 chip_id = inb(0x903C);

    u8 silicon_rev = inb(0x903D);

    u16 pci_clock;

​

    if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1)