/*

   *  Atari Falcon IDE Driver

   *
   *     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.
   */

  #include <linux/module.h>

  #include <linux/types.h>
  #include <linux/mm.h>
  #include <linux/interrupt.h>
  #include <linux/blkdev.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>

  #include <asm/ide.h>

  #define DRV_NAME "falconide"

  
      /*
       *  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.
       */

  static int falconide_intr_lock;
  
  static void falconide_release_lock(void)
  {
  	if (falconide_intr_lock == 0) {
  		printk(KERN_ERR "%s: bug
  ", __func__);
  		return;
  	}
  	falconide_intr_lock = 0;
  	stdma_release();
  }
  
  static void falconide_get_lock(irq_handler_t handler, void *data)
  {
  	if (falconide_intr_lock == 0) {
  		if (in_interrupt() > 0)
  			panic("Falcon IDE hasn't ST-DMA lock in interrupt");
  		stdma_lock(handler, data);
  		falconide_intr_lock = 1;
  	}
  }

  static void falconide_input_data(ide_drive_t *drive, struct ide_cmd *cmd,

  				 void *buf, unsigned int len)

  {

  	unsigned long data_addr = drive->hwif->io_ports.data_addr;

  	if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) {
  		__ide_mm_insw(data_addr, buf, (len + 1) / 2);
  		return;
  	}

  	raw_insw_swapw((u16 *)data_addr, buf, (len + 1) / 2);

  }

  static void falconide_output_data(ide_drive_t *drive, struct ide_cmd *cmd,

  				  void *buf, unsigned int len)

  {

  	unsigned long data_addr = drive->hwif->io_ports.data_addr;

  	if (drive->media == ide_disk && cmd && (cmd->tf_flags & IDE_TFLAG_FS)) {
  		__ide_mm_outsw(data_addr, buf, (len + 1) / 2);
  		return;
  	}

  	raw_outsw_swapw((u16 *)data_addr, buf, (len + 1) / 2);

  }

  /* Atari has a byte-swapped IDE interface */
  static const struct ide_tp_ops falconide_tp_ops = {
  	.exec_command		= ide_exec_command,
  	.read_status		= ide_read_status,
  	.read_altstatus		= ide_read_altstatus,

  	.write_devctl		= ide_write_devctl,

  	.dev_select		= ide_dev_select,

  	.tf_load		= ide_tf_load,
  	.tf_read		= ide_tf_read,
  
  	.input_data		= falconide_input_data,
  	.output_data		= falconide_output_data,
  };
  
  static const struct ide_port_info falconide_port_info = {

  	.get_lock		= falconide_get_lock,
  	.release_lock		= falconide_release_lock,

  	.tp_ops			= &falconide_tp_ops,

  	.host_flags		= IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
  				  IDE_HFLAG_NO_DMA,

  	.irq_flags		= IRQF_SHARED,

  	.chipset		= ide_generic,

  };

  static void __init falconide_setup_ports(struct ide_hw *hw)

  {
  	int i;
  
  	memset(hw, 0, sizeof(*hw));

  	hw->io_ports.data_addr = ATA_HD_BASE;

  
  	for (i = 1; i < 8; i++)

  		hw->io_ports_array[i] = ATA_HD_BASE + 1 + i * 4;

  	hw->io_ports.ctl_addr = ATA_HD_BASE + ATA_HD_CONTROL;

  
  	hw->irq = IRQ_MFP_IDE;

  }

  
      /*
       *  Probe for a Falcon IDE interface
       */

  static int __init falconide_init(void)

  {

  	struct ide_host *host;

  	struct ide_hw hw, *hws[] = { &hw };

  	int rc;

  	if (!MACH_IS_ATARI || !ATARIHW_PRESENT(IDE))

  		return -ENODEV;

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

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

  	falconide_setup_ports(&hw);

  	host = ide_host_alloc(&falconide_port_info, hws, 1);

  	if (host == NULL) {
  		rc = -ENOMEM;
  		goto err;

  	}

  	falconide_get_lock(NULL, NULL);

  	rc = ide_host_register(host, &falconide_port_info, hws);

  	falconide_release_lock();

  
  	if (rc)
  		goto err_free;

  	return 0;

  err_free:
  	ide_host_free(host);
  err:
  	release_mem_region(ATA_HD_BASE, 0x40);
  	return rc;

  }

  
  module_init(falconide_init);

  
  MODULE_LICENSE("GPL");