154 lines
3.3 KiB
C
154 lines
3.3 KiB
C
/*
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* Atari Falcon IDE Driver
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*
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* Created 12 Jul 1997 by Geert Uytterhoeven
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/blkdev.h>
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#include <linux/ide.h>
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#include <linux/init.h>
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#include <asm/setup.h>
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#include <asm/atarihw.h>
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#include <asm/atariints.h>
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#include <asm/atari_stdma.h>
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#define DRV_NAME "falconide"
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/*
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* Base of the IDE interface
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*/
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#define ATA_HD_BASE 0xfff00000
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/*
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* Offsets from the above base
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*/
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#define ATA_HD_CONTROL 0x39
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/*
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* falconide_intr_lock is used to obtain access to the IDE interrupt,
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* which is shared between several drivers.
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*/
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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,
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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,
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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_addr, buf, (len + 1) / 2);
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outsw_swapw(data_addr, buf, (len + 1) / 2);
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}
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/* Atari has a byte-swapped IDE interface */
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static const struct ide_tp_ops falconide_tp_ops = {
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.exec_command = ide_exec_command,
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.read_status = ide_read_status,
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.read_altstatus = ide_read_altstatus,
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.read_sff_dma_status = ide_read_sff_dma_status,
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.set_irq = ide_set_irq,
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.tf_load = ide_tf_load,
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.tf_read = ide_tf_read,
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.input_data = falconide_input_data,
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.output_data = falconide_output_data,
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};
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static const struct ide_port_info falconide_port_info = {
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.tp_ops = &falconide_tp_ops,
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.host_flags = IDE_HFLAG_NO_DMA,
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};
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static void __init falconide_setup_ports(hw_regs_t *hw)
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{
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int i;
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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;
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hw->ack_intr = NULL;
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hw->chipset = ide_generic;
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}
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/*
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* Probe for a Falcon IDE interface
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*/
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static int __init falconide_init(void)
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{
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struct ide_host *host;
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hw_regs_t hw, *hws[] = { &hw, NULL, NULL, NULL };
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int rc;
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if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))
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return -ENODEV;
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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)) {
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printk(KERN_ERR "%s: resources busy\n", DRV_NAME);
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return -EBUSY;
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}
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falconide_setup_ports(&hw);
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host = ide_host_alloc(&falconide_port_info, hws);
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if (host == NULL) {
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rc = -ENOMEM;
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goto err;
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}
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ide_get_lock(NULL, NULL);
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rc = ide_host_register(host, &falconide_port_info, hws);
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ide_release_lock();
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if (rc)
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goto err_free;
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return 0;
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err_free:
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ide_host_free(host);
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err:
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release_mem_region(ATA_HD_BASE, 0x40);
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return rc;
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}
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module_init(falconide_init);
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MODULE_LICENSE("GPL");
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