linux-imx

/*

 * pata_cs5536.c    - CS5536 PATA for new ATA layer

 *            (C) 2007 Martin K. Petersen <mkp@mkp.net>

 *            (C) 2011 Bartlomiej Zolnierkiewicz

 *

 * 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

 *

 * Documentation:

 *  Available from AMD web site.

 *

 * The IDE timing registers for the CS5536 live in the Geode Machine

 * Specific Register file and not PCI config space.  Most BIOSes

 * virtualize the PCI registers so the chip looks like a standard IDE

 * controller.  Unfortunately not all implementations get this right.

 * In particular some have problems with unaligned accesses to the

 * virtualized PCI registers.  This driver always does full dword

 * writes to work around the issue.  Also, in case of a bad BIOS this

 * driver can be loaded with the "msr=1" parameter which forces using

 * the Machine Specific Registers to configure the device.

 */

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/pci.h>

#include <linux/blkdev.h>

#include <linux/delay.h>

#include <linux/libata.h>

#include <scsi/scsi_host.h>

#include <linux/dmi.h>

​

#ifdef CONFIG_X86_32

#include <asm/msr.h>

static int use_msr;

module_param_named(msr, use_msr, int, 0644);

MODULE_PARM_DESC(msr, "Force using MSR to configure IDE function (Default: 0)");

#else

#undef rdmsr    /* avoid accidental MSR usage on, e.g. x86-64 */

#undef wrmsr

#define rdmsr(x, y, z) do { } while (0)

#define wrmsr(x, y, z) do { } while (0)

#define use_msr 0

#endif

​

#define DRV_NAME    "pata_cs5536"

#define DRV_VERSION "0.0.8"

​

enum {

    MSR_IDE_CFG     = 0x51300010,

    PCI_IDE_CFG     = 0x40,

​

    CFG         = 0,

    DTC         = 2,