linux-imx

// SPDX-License-Identifier: GPL-2.0-only

/*

 *  Copyright (C) 1998-2000 Andreas S. Krebs (akrebs@altavista.net), Maintainer

 *  Copyright (C) 1998-2002 Andre Hedrick <andre@linux-ide.org>, Integrator

 *  Copyright (C) 2007-2011 Bartlomiej Zolnierkiewicz

 *

 * CYPRESS CY82C693 chipset IDE controller

 *

 * The CY82C693 chipset is used on Digital's PC-Alpha 164SX boards.

 */

​

#include <linux/module.h>

#include <linux/types.h>

#include <linux/pci.h>

#include <linux/ide.h>

#include <linux/init.h>

​

#include <asm/io.h>

​

#define DRV_NAME "cy82c693"

​

/*

 *  NOTE: the value for busmaster timeout is tricky and I got it by

 *  trial and error!  By using a to low value will cause DMA timeouts

 *  and drop IDE performance, and by using a to high value will cause

 *  audio playback to scatter.

 *  If you know a better value or how to calc it, please let me know.

 */

​

/* twice the value written in cy82c693ub datasheet */

#define BUSMASTER_TIMEOUT   0x50

/*

 * the value above was tested on my machine and it seems to work okay

 */

​

/* here are the offset definitions for the registers */

#define CY82_IDE_CMDREG     0x04

#define CY82_IDE_ADDRSETUP  0x48

#define CY82_IDE_MASTER_IOR 0x4C

#define CY82_IDE_MASTER_IOW 0x4D

#define CY82_IDE_SLAVE_IOR  0x4E

#define CY82_IDE_SLAVE_IOW  0x4F

#define CY82_IDE_MASTER_8BIT    0x50

#define CY82_IDE_SLAVE_8BIT 0x51

​

#define CY82_INDEX_PORT     0x22

#define CY82_DATA_PORT      0x23

​

#define CY82_INDEX_CHANNEL0 0x30

#define CY82_INDEX_CHANNEL1 0x31

#define CY82_INDEX_TIMEOUT  0x32

​

/*

 * set DMA mode a specific channel for CY82C693

 */

​

static void cy82c693_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)

{

    const u8 mode = drive->dma_mode;

    u8 single = (mode & 0x10) >> 4, index = 0, data = 0;

​

    index = hwif->channel ? CY82_INDEX_CHANNEL1 : CY82_INDEX_CHANNEL0;

​

    data = (mode & 3) | (single << 2);

​

    outb(index, CY82_INDEX_PORT);

    outb(data, CY82_DATA_PORT);

​

    /*

     * note: below we set the value for Bus Master IDE TimeOut Register

     * I'm not absolutely sure what this does, but it solved my problem

     * with IDE DMA and sound, so I now can play sound and work with

     * my IDE driver at the same time :-)

     *

     * If you know the correct (best) value for this register please

     * let me know - ASK

     */

​

    data = BUSMASTER_TIMEOUT;

    outb(CY82_INDEX_TIMEOUT, CY82_INDEX_PORT);

    outb(data, CY82_DATA_PORT);

}

​

static void cy82c693_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)

{

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

    int bus_speed = ide_pci_clk ? ide_pci_clk : 33;

    const unsigned long T = 1000000 / bus_speed;

    unsigned int addrCtrl;

    struct ide_timing t;

    u8 time_16, time_8;

​