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ide-h8300.c

/*
 * drivers/ide/h8300/ide-h8300.c
 * H8/300 generic IDE interface
 */

#include <linux/init.h>
#include <linux/ide.h>

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

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

static void mm_outw(u16 d, unsigned long a)
{
      __asm__("mov.b %w0,r2h\n\t"
            "mov.b %x0,r2l\n\t"
            "mov.w r2,@%1"
            :
            :"r"(d),"r"(a)
            :"er2");
}

static u16 mm_inw(unsigned long a)
{
      register u16 r __asm__("er0");
      __asm__("mov.w @%1,r2\n\t"
            "mov.b r2l,%x0\n\t"
            "mov.b r2h,%w0"
            :"=r"(r)
            :"r"(a)
            :"er2");
      return 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);
}

#define H8300_IDE_GAP (2)

static inline void hw_setup(hw_regs_t *hw)
{
      int i;

      memset(hw, 0, sizeof(hw_regs_t));
      for (i = 0; i <= IDE_STATUS_OFFSET; i++)
            hw->io_ports[i] = CONFIG_H8300_IDE_BASE + H8300_IDE_GAP*i;
      hw->io_ports[IDE_CONTROL_OFFSET] = CONFIG_H8300_IDE_ALT;
      hw->irq = EXT_IRQ0 + CONFIG_H8300_IDE_IRQ;
      hw->chipset = ide_generic;
}

static inline void hwif_setup(ide_hwif_t *hwif)
{
      default_hwif_iops(hwif);

      hwif->mmio  = 1;
      hwif->OUTW  = mm_outw;
      hwif->OUTSW = mm_outsw;
      hwif->INW   = mm_inw;
      hwif->INSW  = mm_insw;
      hwif->OUTSL = NULL;
      hwif->INSL  = NULL;
}

void __init h8300_ide_init(void)
{
      hw_regs_t hw;
      ide_hwif_t *hwif;
      int idx;

      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);

      /* register if */
      idx = ide_register_hw(&hw, NULL, 1, &hwif);
      if (idx == -1) {
            printk(KERN_ERR "ide-h8300: IDE I/F register failed\n");
            return;
      }

      hwif_setup(hwif);
      printk(KERN_INFO "ide%d: H8/300 generic IDE interface\n", idx);
      return;

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

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