linux-imx

/*

 *  IDE tuning and bus mastering support for the CS5510/CS5520

 *  chipsets

 *

 *  The CS5510/CS5520 are slightly unusual devices. Unlike the 

 *  typical IDE controllers they do bus mastering with the drive in

 *  PIO mode and smarter silicon.

 *

 *  The practical upshot of this is that we must always tune the

 *  drive for the right PIO mode. We must also ignore all the blacklists

 *  and the drive bus mastering DMA information.

 *

 *  *** This driver is strictly experimental ***

 *

 *  (c) Copyright Red Hat Inc 2002

 * 

 * 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.

 *

 * For the avoidance of doubt the "preferred form" of this code is one which

 * is in an open non patent encumbered format. Where cryptographic key signing

 * forms part of the process of creating an executable the information

 * including keys needed to generate an equivalently functional executable

 * are deemed to be part of the source code.

 *

 */

#include <linux/module.h>

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/pci.h>

#include <linux/ide.h>

#include <linux/dma-mapping.h>

​

#define DRV_NAME "cs5520"

​

struct pio_clocks

{

    int address;

    int assert;

    int recovery;

};

​

static struct pio_clocks cs5520_pio_clocks[]={

    {3, 6, 11},

    {2, 5, 6},

    {1, 4, 3},

    {1, 3, 2},

    {1, 2, 1}

};

​

static void cs5520_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)

{

    struct pci_dev *pdev = to_pci_dev(hwif->dev);

    int controller = drive->dn > 1 ? 1 : 0;