linux-imx

/*

 *  Copyright (C) 1998-2000  Andre Hedrick <andre@linux-ide.org>

 *  Copyright (C) 1995-1998  Mark Lord

 *  Copyright (C) 2007-2009  Bartlomiej Zolnierkiewicz

 *

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

 */

​

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/export.h>

#include <linux/pci.h>

#include <linux/init.h>

#include <linux/interrupt.h>

#include <linux/ide.h>

#include <linux/dma-mapping.h>

​

#include <asm/io.h>

​

/**

 *  ide_setup_pci_baseregs  -   place a PCI IDE controller native

 *  @dev: PCI device of interface to switch native

 *  @name: Name of interface

 *

 *  We attempt to place the PCI interface into PCI native mode. If

 *  we succeed the BARs are ok and the controller is in PCI mode.

 *  Returns 0 on success or an errno code.

 *

 *  FIXME: if we program the interface and then fail to set the BARS

 *  we don't switch it back to legacy mode. Do we actually care ??

 */

​

static int ide_setup_pci_baseregs(struct pci_dev *dev, const char *name)

{

    u8 progif = 0;

​

    /*

     * Place both IDE interfaces into PCI "native" mode:

     */

    if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||

             (progif & 5) != 5) {

        if ((progif & 0xa) != 0xa) {

            printk(KERN_INFO "%s %s: device not capable of full "

                "native PCI mode\n", name, pci_name(dev));

            return -EOPNOTSUPP;

        }

        printk(KERN_INFO "%s %s: placing both ports into native PCI "

            "mode\n", name, pci_name(dev));

        (void) pci_write_config_byte(dev, PCI_CLASS_PROG, progif|5);

        if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||

            (progif & 5) != 5) {

            printk(KERN_ERR "%s %s: rewrite of PROGIF failed, "

                "wanted 0x%04x, got 0x%04x\n",

                name, pci_name(dev), progif | 5, progif);

            return -EOPNOTSUPP;

        }

    }

    return 0;

}

​

#ifdef CONFIG_BLK_DEV_IDEDMA_PCI

static int ide_pci_clear_simplex(unsigned long dma_base, const char *name)

{

    u8 dma_stat = inb(dma_base + 2);

​

    outb(dma_stat & 0x60, dma_base + 2);

    dma_stat = inb(dma_base + 2);

​

    return (dma_stat & 0x80) ? 1 : 0;

}

​

/**

 *  ide_pci_dma_base    -   setup BMIBA

 *  @hwif: IDE interface

 *  @d: IDE port info

 *

 *  Fetch the DMA Bus-Master-I/O-Base-Address (BMIBA) from PCI space.

 */

​

unsigned long ide_pci_dma_base(ide_hwif_t *hwif, const struct ide_port_info *d)

{

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

    unsigned long dma_base = 0;

​

    if (hwif->host_flags & IDE_HFLAG_MMIO)

        return hwif->dma_base;

​

    if (hwif->mate && hwif->mate->dma_base) {

        dma_base = hwif->mate->dma_base - (hwif->channel ? 0 : 8);

    } else {

        u8 baridx = (d->host_flags & IDE_HFLAG_CS5520) ? 2 : 4;

​