falconide.c 2.8 KB
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/*
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 *  Atari Falcon IDE Driver
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 *
 *     Created 12 Jul 1997 by Geert Uytterhoeven
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive for
 *  more details.
 */

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#include <linux/module.h>
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#include <linux/types.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/init.h>

#include <asm/setup.h>
#include <asm/atarihw.h>
#include <asm/atariints.h>
#include <asm/atari_stdma.h>

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#define DRV_NAME "falconide"
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    /*
     *  Base of the IDE interface
     */

#define ATA_HD_BASE	0xfff00000

    /*
     *  Offsets from the above base
     */

#define ATA_HD_CONTROL	0x39

    /*
     *  falconide_intr_lock is used to obtain access to the IDE interrupt,
     *  which is shared between several drivers.
     */

int falconide_intr_lock;
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EXPORT_SYMBOL(falconide_intr_lock);
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static void falconide_input_data(ide_drive_t *drive, struct request *rq,
				 void *buf, unsigned int len)
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{
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	unsigned long data_addr = drive->hwif->io_ports.data_addr;
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	if (drive->media == ide_disk && rq && rq->cmd_type == REQ_TYPE_FS)
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		return insw(data_addr, buf, (len + 1) / 2);
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	insw_swapw(data_addr, buf, (len + 1) / 2);
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}

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static void falconide_output_data(ide_drive_t *drive, struct request *rq,
				  void *buf, unsigned int len)
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{
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	unsigned long data_addr = drive->hwif->io_ports.data_addr;

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	if (drive->media == ide_disk && rq && rq->cmd_type == REQ_TYPE_FS)
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		return outsw(data_adr, buf, (len + 1) / 2);
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	outsw_swapw(data_addr, buf, (len + 1) / 2);
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}

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static void __init falconide_setup_ports(hw_regs_t *hw)
{
	int i;

	memset(hw, 0, sizeof(*hw));

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	hw->io_ports.data_addr = ATA_HD_BASE;
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	for (i = 1; i < 8; i++)
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		hw->io_ports_array[i] = ATA_HD_BASE + 1 + i * 4;
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	hw->io_ports.ctl_addr = ATA_HD_BASE + ATA_HD_CONTROL;
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	hw->irq = IRQ_MFP_IDE;
	hw->ack_intr = NULL;
}
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    /*
     *  Probe for a Falcon IDE interface
     */

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static int __init falconide_init(void)
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{
	hw_regs_t hw;
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	ide_hwif_t *hwif;
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	if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
		return 0;

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	printk(KERN_INFO "ide: Falcon IDE controller\n");

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	if (!request_mem_region(ATA_HD_BASE, 0x40, DRV_NAME)) {
		printk(KERN_ERR "%s: resources busy\n", DRV_NAME);
		return -EBUSY;
	}

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	falconide_setup_ports(&hw);
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	hwif = ide_find_port();
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	if (hwif) {
		u8 index = hwif->index;
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		u8 idx[4] = { index, 0xff, 0xff, 0xff };
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		ide_init_port_data(hwif, index);
		ide_init_port_hw(hwif, &hw);

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		/* Atari has a byte-swapped IDE interface */
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		hwif->input_data  = falconide_input_data;
		hwif->output_data = falconide_output_data;
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		ide_get_lock(NULL, NULL);
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		ide_device_add(idx, NULL);
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		ide_release_lock();
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	}
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	return 0;
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}
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module_init(falconide_init);
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MODULE_LICENSE("GPL");