/*

   * H8/300 generic IDE interface
   */
  
  #include <linux/init.h>
  #include <linux/ide.h>

  
  #include <asm/io.h>
  #include <asm/irq.h>

  #define DRV_NAME "ide-h8300"

  #define bswap(d) \
  ({					\
  	u16 r;				\
  	__asm__("mov.b %w1,r1h
  \t"	\
  		"mov.b %x1,r1l
  \t"	\
  		"mov.w r1,%0"		\
  		:"=r"(r)		\
  		:"r"(d)			\
  		:"er1");		\
  	(r);				\
  })

  static void mm_outsw(unsigned long addr, void *buf, u32 len)
  {
  	unsigned short *bp = (unsigned short *)buf;
  	for (; len > 0; len--, bp++)
  		*(volatile u16 *)addr = bswap(*bp);
  }
  
  static void mm_insw(unsigned long addr, void *buf, u32 len)
  {
  	unsigned short *bp = (unsigned short *)buf;
  	for (; len > 0; len--, bp++)
  		*bp = bswap(*(volatile u16 *)addr);
  }

  static void h8300_input_data(ide_drive_t *drive, struct ide_cmd *cmd,

  			     void *buf, unsigned int len)
  {
  	mm_insw(drive->hwif->io_ports.data_addr, buf, (len + 1) / 2);
  }

  static void h8300_output_data(ide_drive_t *drive, struct ide_cmd *cmd,

  			      void *buf, unsigned int len)
  {
  	mm_outsw(drive->hwif->io_ports.data_addr, buf, (len + 1) / 2);
  }

  static const struct ide_tp_ops h8300_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		= h8300_input_data,
  	.output_data		= h8300_output_data,
  };

  #define H8300_IDE_GAP (2)

  static inline void hw_setup(struct ide_hw *hw)

  {
  	int i;

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

  	for (i = 0; i <= 7; i++)
  		hw->io_ports_array[i] = CONFIG_H8300_IDE_BASE + H8300_IDE_GAP*i;
  	hw->io_ports.ctl_addr = CONFIG_H8300_IDE_ALT;

  	hw->irq = EXT_IRQ0 + CONFIG_H8300_IDE_IRQ;

  }

  static const struct ide_port_info h8300_port_info = {

  	.tp_ops			= &h8300_tp_ops,

  	.host_flags		= IDE_HFLAG_NO_IO_32BIT | IDE_HFLAG_NO_DMA,

  	.chipset		= ide_generic,

  };

  static int __init h8300_ide_init(void)

  {

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

  	printk(KERN_INFO DRV_NAME ": H8/300 generic IDE interface
  ");

  	if (!request_region(CONFIG_H8300_IDE_BASE, H8300_IDE_GAP*8, "ide-h8300"))
  		goto out_busy;
  	if (!request_region(CONFIG_H8300_IDE_ALT, H8300_IDE_GAP, "ide-h8300")) {
  		release_region(CONFIG_H8300_IDE_BASE, H8300_IDE_GAP*8);
  		goto out_busy;
  	}
  
  	hw_setup(&hw);

  	return ide_host_add(&h8300_port_info, hws, 1, NULL);

  
  out_busy:
  	printk(KERN_ERR "ide-h8300: IDE I/F resource already used.
  ");

  
  	return -EBUSY;

  }

  
  module_init(h8300_ide_init);

  
  MODULE_LICENSE("GPL");