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gayle.c

/*
 *  linux/drivers/ide/legacy/gayle.c -- Amiga Gayle IDE Driver
 *
 *     Created 9 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/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 <linux/zorro.h>

#include <asm/setup.h>
#include <asm/amigahw.h>
#include <asm/amigaints.h>
#include <asm/amigayle.h>


    /*
     *  Bases of the IDE interfaces
     */

#define GAYLE_BASE_4000 0xdd2020    /* A4000/A4000T */
#define GAYLE_BASE_1200 0xda0000    /* A1200/A600 and E-Matrix 530 */

    /*
     *  Offsets from one of the above bases
     */

#define GAYLE_DATA      0x00
#define GAYLE_ERROR     0x06        /* see err-bits */
#define GAYLE_NSECTOR   0x0a        /* nr of sectors to read/write */
#define GAYLE_SECTOR    0x0e        /* starting sector */
#define GAYLE_LCYL      0x12        /* starting cylinder */
#define GAYLE_HCYL      0x16        /* high byte of starting cyl */
#define GAYLE_SELECT    0x1a        /* 101dhhhh , d=drive, hhhh=head */
#define GAYLE_STATUS    0x1e        /* see status-bits */
#define GAYLE_CONTROL   0x101a

static int gayle_offsets[IDE_NR_PORTS] __initdata = {
    GAYLE_DATA, GAYLE_ERROR, GAYLE_NSECTOR, GAYLE_SECTOR, GAYLE_LCYL,
    GAYLE_HCYL, GAYLE_SELECT, GAYLE_STATUS, -1, -1
};


    /*
     *  These are at different offsets from the base
     */

#define GAYLE_IRQ_4000  0xdd3020    /* MSB = 1, Harddisk is source of */
#define GAYLE_IRQ_1200  0xda9000    /* interrupt */


    /*
     *  Offset of the secondary port for IDE doublers
     *  Note that GAYLE_CONTROL is NOT available then!
     */

#define GAYLE_NEXT_PORT 0x1000

#ifndef CONFIG_BLK_DEV_IDEDOUBLER
#define GAYLE_NUM_HWIFS       1
#define GAYLE_NUM_PROBE_HWIFS GAYLE_NUM_HWIFS
#define GAYLE_HAS_CONTROL_REG 1
#define GAYLE_IDEREG_SIZE     0x2000
#else /* CONFIG_BLK_DEV_IDEDOUBLER */
#define GAYLE_NUM_HWIFS       2
#define GAYLE_NUM_PROBE_HWIFS (ide_doubler ? GAYLE_NUM_HWIFS : \
                                     GAYLE_NUM_HWIFS-1)
#define GAYLE_HAS_CONTROL_REG (!ide_doubler)
#define GAYLE_IDEREG_SIZE     (ide_doubler ? 0x1000 : 0x2000)
int ide_doubler = 0;    /* support IDE doublers? */
#endif /* CONFIG_BLK_DEV_IDEDOUBLER */


    /*
     *  Check and acknowledge the interrupt status
     */

static int gayle_ack_intr_a4000(ide_hwif_t *hwif)
{
    unsigned char ch;

    ch = z_readb(hwif->io_ports[IDE_IRQ_OFFSET]);
    if (!(ch & GAYLE_IRQ_IDE))
      return 0;
    return 1;
}

static int gayle_ack_intr_a1200(ide_hwif_t *hwif)
{
    unsigned char ch;

    ch = z_readb(hwif->io_ports[IDE_IRQ_OFFSET]);
    if (!(ch & GAYLE_IRQ_IDE))
      return 0;
    (void)z_readb(hwif->io_ports[IDE_STATUS_OFFSET]);
    z_writeb(0x7c, hwif->io_ports[IDE_IRQ_OFFSET]);
    return 1;
}

    /*
     *  Probe for a Gayle IDE interface (and optionally for an IDE doubler)
     */

void __init gayle_init(void)
{
    int a4000, i;

    if (!MACH_IS_AMIGA)
      return;

    if ((a4000 = AMIGAHW_PRESENT(A4000_IDE)) || AMIGAHW_PRESENT(A1200_IDE))
      goto found;

#ifdef CONFIG_ZORRO
    if (zorro_find_device(ZORRO_PROD_MTEC_VIPER_MK_V_E_MATRIX_530_SCSI_IDE,
                    NULL))
      goto found;
#endif
    return;

found:
    for (i = 0; i < GAYLE_NUM_PROBE_HWIFS; i++) {
      unsigned long base, ctrlport, irqport;
      ide_ack_intr_t *ack_intr;
      hw_regs_t hw;
      ide_hwif_t *hwif;
      int index;
      unsigned long phys_base, res_start, res_n;

      if (a4000) {
          phys_base = GAYLE_BASE_4000;
          irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_4000);
          ack_intr = gayle_ack_intr_a4000;
      } else {
          phys_base = GAYLE_BASE_1200;
          irqport = (unsigned long)ZTWO_VADDR(GAYLE_IRQ_1200);
          ack_intr = gayle_ack_intr_a1200;
      }
/*
 * FIXME: we now have selectable modes between mmio v/s iomio
 */

      phys_base += i*GAYLE_NEXT_PORT;

      res_start = ((unsigned long)phys_base) & ~(GAYLE_NEXT_PORT-1);
      res_n = GAYLE_IDEREG_SIZE;

      if (!request_mem_region(res_start, res_n, "IDE"))
          continue;

      base = (unsigned long)ZTWO_VADDR(phys_base);
      ctrlport = GAYLE_HAS_CONTROL_REG ? (base + GAYLE_CONTROL) : 0;

      ide_setup_ports(&hw, base, gayle_offsets,
                  ctrlport, irqport, ack_intr,
//                &gayle_iops,
                  IRQ_AMIGA_PORTS);

      index = ide_register_hw(&hw, NULL, 1, &hwif);
      if (index != -1) {
          hwif->mmio = 1;
          switch (i) {
            case 0:
                printk("ide%d: Gayle IDE interface (A%d style)\n", index,
                     a4000 ? 4000 : 1200);
                break;
#ifdef CONFIG_BLK_DEV_IDEDOUBLER
            case 1:
                printk("ide%d: IDE doubler\n", index);
                break;
#endif /* CONFIG_BLK_DEV_IDEDOUBLER */
          }
      } else
          release_mem_region(res_start, res_n);
    }
}

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